2432 lines
66 KiB
C
2432 lines
66 KiB
C
/*
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* bcm63xx_udc.c -- BCM63xx UDC high/full speed USB device controller
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*
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* Copyright (C) 2012 Kevin Cernekee <cernekee@gmail.com>
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* Copyright (C) 2012 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/clk.h>
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#include <linux/compiler.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/kconfig.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/workqueue.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_iudma.h>
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#include <bcm63xx_dev_usb_usbd.h>
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#include <bcm63xx_io.h>
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#include <bcm63xx_regs.h>
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#define DRV_MODULE_NAME "bcm63xx_udc"
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static const char bcm63xx_ep0name[] = "ep0";
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static const char *const bcm63xx_ep_name[] = {
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bcm63xx_ep0name,
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"ep1in-bulk", "ep2out-bulk", "ep3in-int", "ep4out-int",
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};
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static bool use_fullspeed;
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module_param(use_fullspeed, bool, S_IRUGO);
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MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
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/*
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* RX IRQ coalescing options:
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*
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* false (default) - one IRQ per DATAx packet. Slow but reliable. The
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* driver is able to pass the "testusb" suite and recover from conditions like:
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*
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* 1) Device queues up a 2048-byte RX IUDMA transaction on an OUT bulk ep
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* 2) Host sends 512 bytes of data
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* 3) Host decides to reconfigure the device and sends SET_INTERFACE
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* 4) Device shuts down the endpoint and cancels the RX transaction
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*
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* true - one IRQ per transfer, for transfers <= 2048B. Generates
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* considerably fewer IRQs, but error recovery is less robust. Does not
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* reliably pass "testusb".
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*
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* TX always uses coalescing, because we can cancel partially complete TX
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* transfers by repeatedly flushing the FIFO. The hardware doesn't allow
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* this on RX.
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*/
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static bool irq_coalesce;
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module_param(irq_coalesce, bool, S_IRUGO);
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MODULE_PARM_DESC(irq_coalesce, "take one IRQ per RX transfer");
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#define BCM63XX_NUM_EP 5
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#define BCM63XX_NUM_IUDMA 6
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#define BCM63XX_NUM_FIFO_PAIRS 3
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#define IUDMA_RESET_TIMEOUT_US 10000
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#define IUDMA_EP0_RXCHAN 0
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#define IUDMA_EP0_TXCHAN 1
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#define IUDMA_MAX_FRAGMENT 2048
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#define BCM63XX_MAX_CTRL_PKT 64
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#define BCMEP_CTRL 0x00
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#define BCMEP_ISOC 0x01
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#define BCMEP_BULK 0x02
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#define BCMEP_INTR 0x03
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#define BCMEP_OUT 0x00
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#define BCMEP_IN 0x01
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#define BCM63XX_SPD_FULL 1
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#define BCM63XX_SPD_HIGH 0
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#define IUDMA_DMAC_OFFSET 0x200
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#define IUDMA_DMAS_OFFSET 0x400
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enum bcm63xx_ep0_state {
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EP0_REQUEUE,
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EP0_IDLE,
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EP0_IN_DATA_PHASE_SETUP,
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EP0_IN_DATA_PHASE_COMPLETE,
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EP0_OUT_DATA_PHASE_SETUP,
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EP0_OUT_DATA_PHASE_COMPLETE,
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EP0_OUT_STATUS_PHASE,
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EP0_IN_FAKE_STATUS_PHASE,
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EP0_SHUTDOWN,
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};
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static const char __maybe_unused bcm63xx_ep0_state_names[][32] = {
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"REQUEUE",
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"IDLE",
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"IN_DATA_PHASE_SETUP",
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"IN_DATA_PHASE_COMPLETE",
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"OUT_DATA_PHASE_SETUP",
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"OUT_DATA_PHASE_COMPLETE",
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"OUT_STATUS_PHASE",
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"IN_FAKE_STATUS_PHASE",
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"SHUTDOWN",
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};
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/**
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* struct iudma_ch_cfg - Static configuration for an IUDMA channel.
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* @ep_num: USB endpoint number.
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* @n_bds: Number of buffer descriptors in the ring.
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* @ep_type: Endpoint type (control, bulk, interrupt).
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* @dir: Direction (in, out).
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* @n_fifo_slots: Number of FIFO entries to allocate for this channel.
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* @max_pkt_hs: Maximum packet size in high speed mode.
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* @max_pkt_fs: Maximum packet size in full speed mode.
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*/
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struct iudma_ch_cfg {
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int ep_num;
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int n_bds;
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int ep_type;
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int dir;
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int n_fifo_slots;
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int max_pkt_hs;
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int max_pkt_fs;
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};
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static const struct iudma_ch_cfg iudma_defaults[] = {
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/* This controller was designed to support a CDC/RNDIS application.
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It may be possible to reconfigure some of the endpoints, but
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the hardware limitations (FIFO sizing and number of DMA channels)
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may significantly impact flexibility and/or stability. Change
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these values at your own risk.
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ep_num ep_type n_fifo_slots max_pkt_fs
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idx | n_bds | dir | max_pkt_hs |
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| | | | | | | | */
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[0] = { -1, 4, BCMEP_CTRL, BCMEP_OUT, 32, 64, 64 },
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[1] = { 0, 4, BCMEP_CTRL, BCMEP_OUT, 32, 64, 64 },
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[2] = { 2, 16, BCMEP_BULK, BCMEP_OUT, 128, 512, 64 },
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[3] = { 1, 16, BCMEP_BULK, BCMEP_IN, 128, 512, 64 },
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[4] = { 4, 4, BCMEP_INTR, BCMEP_OUT, 32, 64, 64 },
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[5] = { 3, 4, BCMEP_INTR, BCMEP_IN, 32, 64, 64 },
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};
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struct bcm63xx_udc;
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/**
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* struct iudma_ch - Represents the current state of a single IUDMA channel.
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* @ch_idx: IUDMA channel index (0 to BCM63XX_NUM_IUDMA-1).
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* @ep_num: USB endpoint number. -1 for ep0 RX.
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* @enabled: Whether bcm63xx_ep_enable() has been called.
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* @max_pkt: "Chunk size" on the USB interface. Based on interface speed.
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* @is_tx: true for TX, false for RX.
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* @bep: Pointer to the associated endpoint. NULL for ep0 RX.
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* @udc: Reference to the device controller.
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* @read_bd: Next buffer descriptor to reap from the hardware.
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* @write_bd: Next BD available for a new packet.
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* @end_bd: Points to the final BD in the ring.
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* @n_bds_used: Number of BD entries currently occupied.
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* @bd_ring: Base pointer to the BD ring.
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* @bd_ring_dma: Physical (DMA) address of bd_ring.
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* @n_bds: Total number of BDs in the ring.
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*
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* ep0 has two IUDMA channels (IUDMA_EP0_RXCHAN and IUDMA_EP0_TXCHAN), as it is
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* bidirectional. The "struct usb_ep" associated with ep0 is for TX (IN)
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* only.
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*
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* Each bulk/intr endpoint has a single IUDMA channel and a single
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* struct usb_ep.
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*/
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struct iudma_ch {
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unsigned int ch_idx;
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int ep_num;
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bool enabled;
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int max_pkt;
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bool is_tx;
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struct bcm63xx_ep *bep;
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struct bcm63xx_udc *udc;
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struct bcm_enet_desc *read_bd;
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struct bcm_enet_desc *write_bd;
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struct bcm_enet_desc *end_bd;
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int n_bds_used;
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struct bcm_enet_desc *bd_ring;
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dma_addr_t bd_ring_dma;
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unsigned int n_bds;
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};
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/**
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* struct bcm63xx_ep - Internal (driver) state of a single endpoint.
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* @ep_num: USB endpoint number.
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* @iudma: Pointer to IUDMA channel state.
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* @ep: USB gadget layer representation of the EP.
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* @udc: Reference to the device controller.
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* @queue: Linked list of outstanding requests for this EP.
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* @halted: 1 if the EP is stalled; 0 otherwise.
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*/
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struct bcm63xx_ep {
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unsigned int ep_num;
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struct iudma_ch *iudma;
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struct usb_ep ep;
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struct bcm63xx_udc *udc;
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struct list_head queue;
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unsigned halted:1;
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};
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/**
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* struct bcm63xx_req - Internal (driver) state of a single request.
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* @queue: Links back to the EP's request list.
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* @req: USB gadget layer representation of the request.
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* @offset: Current byte offset into the data buffer (next byte to queue).
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* @bd_bytes: Number of data bytes in outstanding BD entries.
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* @iudma: IUDMA channel used for the request.
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*/
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struct bcm63xx_req {
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struct list_head queue; /* ep's requests */
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struct usb_request req;
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unsigned int offset;
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unsigned int bd_bytes;
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struct iudma_ch *iudma;
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};
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/**
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* struct bcm63xx_udc - Driver/hardware private context.
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* @lock: Spinlock to mediate access to this struct, and (most) HW regs.
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* @dev: Generic Linux device structure.
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* @pd: Platform data (board/port info).
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* @usbd_clk: Clock descriptor for the USB device block.
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* @usbh_clk: Clock descriptor for the USB host block.
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* @gadget: USB slave device.
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* @driver: Driver for USB slave devices.
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* @usbd_regs: Base address of the USBD/USB20D block.
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* @iudma_regs: Base address of the USBD's associated IUDMA block.
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* @bep: Array of endpoints, including ep0.
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* @iudma: Array of all IUDMA channels used by this controller.
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* @cfg: USB configuration number, from SET_CONFIGURATION wValue.
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* @iface: USB interface number, from SET_INTERFACE wIndex.
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* @alt_iface: USB alt interface number, from SET_INTERFACE wValue.
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* @ep0_ctrl_req: Request object for bcm63xx_udc-initiated ep0 transactions.
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* @ep0_ctrl_buf: Data buffer for ep0_ctrl_req.
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* @ep0state: Current state of the ep0 state machine.
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* @ep0_wq: Workqueue struct used to wake up the ep0 state machine.
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* @wedgemap: Bitmap of wedged endpoints.
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* @ep0_req_reset: USB reset is pending.
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* @ep0_req_set_cfg: Need to spoof a SET_CONFIGURATION packet.
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* @ep0_req_set_iface: Need to spoof a SET_INTERFACE packet.
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* @ep0_req_shutdown: Driver is shutting down; requesting ep0 to halt activity.
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* @ep0_req_completed: ep0 request has completed; worker has not seen it yet.
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* @ep0_reply: Pending reply from gadget driver.
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* @ep0_request: Outstanding ep0 request.
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* @debugfs_root: debugfs directory: /sys/kernel/debug/<DRV_MODULE_NAME>.
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* @debugfs_usbd: debugfs file "usbd" for controller state.
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* @debugfs_iudma: debugfs file "usbd" for IUDMA state.
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*/
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struct bcm63xx_udc {
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spinlock_t lock;
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struct device *dev;
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struct bcm63xx_usbd_platform_data *pd;
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struct clk *usbd_clk;
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struct clk *usbh_clk;
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struct usb_gadget gadget;
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struct usb_gadget_driver *driver;
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void __iomem *usbd_regs;
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void __iomem *iudma_regs;
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struct bcm63xx_ep bep[BCM63XX_NUM_EP];
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struct iudma_ch iudma[BCM63XX_NUM_IUDMA];
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int cfg;
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int iface;
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int alt_iface;
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struct bcm63xx_req ep0_ctrl_req;
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u8 *ep0_ctrl_buf;
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int ep0state;
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struct work_struct ep0_wq;
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unsigned long wedgemap;
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unsigned ep0_req_reset:1;
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unsigned ep0_req_set_cfg:1;
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unsigned ep0_req_set_iface:1;
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unsigned ep0_req_shutdown:1;
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unsigned ep0_req_completed:1;
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struct usb_request *ep0_reply;
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struct usb_request *ep0_request;
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struct dentry *debugfs_root;
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struct dentry *debugfs_usbd;
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struct dentry *debugfs_iudma;
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};
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static const struct usb_ep_ops bcm63xx_udc_ep_ops;
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/***********************************************************************
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* Convenience functions
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***********************************************************************/
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static inline struct bcm63xx_udc *gadget_to_udc(struct usb_gadget *g)
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{
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return container_of(g, struct bcm63xx_udc, gadget);
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}
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static inline struct bcm63xx_ep *our_ep(struct usb_ep *ep)
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{
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return container_of(ep, struct bcm63xx_ep, ep);
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}
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static inline struct bcm63xx_req *our_req(struct usb_request *req)
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{
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return container_of(req, struct bcm63xx_req, req);
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}
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static inline u32 usbd_readl(struct bcm63xx_udc *udc, u32 off)
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{
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return bcm_readl(udc->usbd_regs + off);
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}
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static inline void usbd_writel(struct bcm63xx_udc *udc, u32 val, u32 off)
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{
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bcm_writel(val, udc->usbd_regs + off);
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}
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static inline u32 usb_dma_readl(struct bcm63xx_udc *udc, u32 off)
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{
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return bcm_readl(udc->iudma_regs + off);
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}
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static inline void usb_dma_writel(struct bcm63xx_udc *udc, u32 val, u32 off)
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{
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bcm_writel(val, udc->iudma_regs + off);
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}
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static inline u32 usb_dmac_readl(struct bcm63xx_udc *udc, u32 off)
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{
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return bcm_readl(udc->iudma_regs + IUDMA_DMAC_OFFSET + off);
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}
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static inline void usb_dmac_writel(struct bcm63xx_udc *udc, u32 val, u32 off)
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{
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bcm_writel(val, udc->iudma_regs + IUDMA_DMAC_OFFSET + off);
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}
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static inline u32 usb_dmas_readl(struct bcm63xx_udc *udc, u32 off)
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{
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return bcm_readl(udc->iudma_regs + IUDMA_DMAS_OFFSET + off);
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}
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static inline void usb_dmas_writel(struct bcm63xx_udc *udc, u32 val, u32 off)
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{
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bcm_writel(val, udc->iudma_regs + IUDMA_DMAS_OFFSET + off);
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}
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static inline void set_clocks(struct bcm63xx_udc *udc, bool is_enabled)
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{
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if (is_enabled) {
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clk_enable(udc->usbh_clk);
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clk_enable(udc->usbd_clk);
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udelay(10);
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} else {
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clk_disable(udc->usbd_clk);
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clk_disable(udc->usbh_clk);
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}
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}
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/***********************************************************************
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* Low-level IUDMA / FIFO operations
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***********************************************************************/
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/**
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* bcm63xx_ep_dma_select - Helper function to set up the init_sel signal.
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* @udc: Reference to the device controller.
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* @idx: Desired init_sel value.
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*
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* The "init_sel" signal is used as a selection index for both endpoints
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* and IUDMA channels. Since these do not map 1:1, the use of this signal
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* depends on the context.
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*/
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static void bcm63xx_ep_dma_select(struct bcm63xx_udc *udc, int idx)
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{
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u32 val = usbd_readl(udc, USBD_CONTROL_REG);
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val &= ~USBD_CONTROL_INIT_SEL_MASK;
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val |= idx << USBD_CONTROL_INIT_SEL_SHIFT;
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usbd_writel(udc, val, USBD_CONTROL_REG);
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}
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/**
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* bcm63xx_set_stall - Enable/disable stall on one endpoint.
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* @udc: Reference to the device controller.
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* @bep: Endpoint on which to operate.
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* @is_stalled: true to enable stall, false to disable.
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*
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* See notes in bcm63xx_update_wedge() regarding automatic clearing of
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* halt/stall conditions.
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*/
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static void bcm63xx_set_stall(struct bcm63xx_udc *udc, struct bcm63xx_ep *bep,
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bool is_stalled)
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{
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u32 val;
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val = USBD_STALL_UPDATE_MASK |
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(is_stalled ? USBD_STALL_ENABLE_MASK : 0) |
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(bep->ep_num << USBD_STALL_EPNUM_SHIFT);
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usbd_writel(udc, val, USBD_STALL_REG);
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}
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/**
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* bcm63xx_fifo_setup - (Re)initialize FIFO boundaries and settings.
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* @udc: Reference to the device controller.
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*
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* These parameters depend on the USB link speed. Settings are
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* per-IUDMA-channel-pair.
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*/
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static void bcm63xx_fifo_setup(struct bcm63xx_udc *udc)
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{
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int is_hs = udc->gadget.speed == USB_SPEED_HIGH;
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u32 i, val, rx_fifo_slot, tx_fifo_slot;
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/* set up FIFO boundaries and packet sizes; this is done in pairs */
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rx_fifo_slot = tx_fifo_slot = 0;
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for (i = 0; i < BCM63XX_NUM_IUDMA; i += 2) {
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const struct iudma_ch_cfg *rx_cfg = &iudma_defaults[i];
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const struct iudma_ch_cfg *tx_cfg = &iudma_defaults[i + 1];
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bcm63xx_ep_dma_select(udc, i >> 1);
|
|
|
|
val = (rx_fifo_slot << USBD_RXFIFO_CONFIG_START_SHIFT) |
|
|
((rx_fifo_slot + rx_cfg->n_fifo_slots - 1) <<
|
|
USBD_RXFIFO_CONFIG_END_SHIFT);
|
|
rx_fifo_slot += rx_cfg->n_fifo_slots;
|
|
usbd_writel(udc, val, USBD_RXFIFO_CONFIG_REG);
|
|
usbd_writel(udc,
|
|
is_hs ? rx_cfg->max_pkt_hs : rx_cfg->max_pkt_fs,
|
|
USBD_RXFIFO_EPSIZE_REG);
|
|
|
|
val = (tx_fifo_slot << USBD_TXFIFO_CONFIG_START_SHIFT) |
|
|
((tx_fifo_slot + tx_cfg->n_fifo_slots - 1) <<
|
|
USBD_TXFIFO_CONFIG_END_SHIFT);
|
|
tx_fifo_slot += tx_cfg->n_fifo_slots;
|
|
usbd_writel(udc, val, USBD_TXFIFO_CONFIG_REG);
|
|
usbd_writel(udc,
|
|
is_hs ? tx_cfg->max_pkt_hs : tx_cfg->max_pkt_fs,
|
|
USBD_TXFIFO_EPSIZE_REG);
|
|
|
|
usbd_readl(udc, USBD_TXFIFO_EPSIZE_REG);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_fifo_reset_ep - Flush a single endpoint's FIFO.
|
|
* @udc: Reference to the device controller.
|
|
* @ep_num: Endpoint number.
|
|
*/
|
|
static void bcm63xx_fifo_reset_ep(struct bcm63xx_udc *udc, int ep_num)
|
|
{
|
|
u32 val;
|
|
|
|
bcm63xx_ep_dma_select(udc, ep_num);
|
|
|
|
val = usbd_readl(udc, USBD_CONTROL_REG);
|
|
val |= USBD_CONTROL_FIFO_RESET_MASK;
|
|
usbd_writel(udc, val, USBD_CONTROL_REG);
|
|
usbd_readl(udc, USBD_CONTROL_REG);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_fifo_reset - Flush all hardware FIFOs.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static void bcm63xx_fifo_reset(struct bcm63xx_udc *udc)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < BCM63XX_NUM_FIFO_PAIRS; i++)
|
|
bcm63xx_fifo_reset_ep(udc, i);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep_init - Initial (one-time) endpoint initialization.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static void bcm63xx_ep_init(struct bcm63xx_udc *udc)
|
|
{
|
|
u32 i, val;
|
|
|
|
for (i = 0; i < BCM63XX_NUM_IUDMA; i++) {
|
|
const struct iudma_ch_cfg *cfg = &iudma_defaults[i];
|
|
|
|
if (cfg->ep_num < 0)
|
|
continue;
|
|
|
|
bcm63xx_ep_dma_select(udc, cfg->ep_num);
|
|
val = (cfg->ep_type << USBD_EPNUM_TYPEMAP_TYPE_SHIFT) |
|
|
((i >> 1) << USBD_EPNUM_TYPEMAP_DMA_CH_SHIFT);
|
|
usbd_writel(udc, val, USBD_EPNUM_TYPEMAP_REG);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep_setup - Configure per-endpoint settings.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* This needs to be rerun if the speed/cfg/intf/altintf changes.
|
|
*/
|
|
static void bcm63xx_ep_setup(struct bcm63xx_udc *udc)
|
|
{
|
|
u32 val, i;
|
|
|
|
usbd_writel(udc, USBD_CSR_SETUPADDR_DEF, USBD_CSR_SETUPADDR_REG);
|
|
|
|
for (i = 0; i < BCM63XX_NUM_IUDMA; i++) {
|
|
const struct iudma_ch_cfg *cfg = &iudma_defaults[i];
|
|
int max_pkt = udc->gadget.speed == USB_SPEED_HIGH ?
|
|
cfg->max_pkt_hs : cfg->max_pkt_fs;
|
|
int idx = cfg->ep_num;
|
|
|
|
udc->iudma[i].max_pkt = max_pkt;
|
|
|
|
if (idx < 0)
|
|
continue;
|
|
udc->bep[idx].ep.maxpacket = max_pkt;
|
|
|
|
val = (idx << USBD_CSR_EP_LOG_SHIFT) |
|
|
(cfg->dir << USBD_CSR_EP_DIR_SHIFT) |
|
|
(cfg->ep_type << USBD_CSR_EP_TYPE_SHIFT) |
|
|
(udc->cfg << USBD_CSR_EP_CFG_SHIFT) |
|
|
(udc->iface << USBD_CSR_EP_IFACE_SHIFT) |
|
|
(udc->alt_iface << USBD_CSR_EP_ALTIFACE_SHIFT) |
|
|
(max_pkt << USBD_CSR_EP_MAXPKT_SHIFT);
|
|
usbd_writel(udc, val, USBD_CSR_EP_REG(idx));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* iudma_write - Queue a single IUDMA transaction.
|
|
* @udc: Reference to the device controller.
|
|
* @iudma: IUDMA channel to use.
|
|
* @breq: Request containing the transaction data.
|
|
*
|
|
* For RX IUDMA, this will queue a single buffer descriptor, as RX IUDMA
|
|
* does not honor SOP/EOP so the handling of multiple buffers is ambiguous.
|
|
* So iudma_write() may be called several times to fulfill a single
|
|
* usb_request.
|
|
*
|
|
* For TX IUDMA, this can queue multiple buffer descriptors if needed.
|
|
*/
|
|
static void iudma_write(struct bcm63xx_udc *udc, struct iudma_ch *iudma,
|
|
struct bcm63xx_req *breq)
|
|
{
|
|
int first_bd = 1, last_bd = 0, extra_zero_pkt = 0;
|
|
unsigned int bytes_left = breq->req.length - breq->offset;
|
|
const int max_bd_bytes = !irq_coalesce && !iudma->is_tx ?
|
|
iudma->max_pkt : IUDMA_MAX_FRAGMENT;
|
|
|
|
iudma->n_bds_used = 0;
|
|
breq->bd_bytes = 0;
|
|
breq->iudma = iudma;
|
|
|
|
if ((bytes_left % iudma->max_pkt == 0) && bytes_left && breq->req.zero)
|
|
extra_zero_pkt = 1;
|
|
|
|
do {
|
|
struct bcm_enet_desc *d = iudma->write_bd;
|
|
u32 dmaflags = 0;
|
|
unsigned int n_bytes;
|
|
|
|
if (d == iudma->end_bd) {
|
|
dmaflags |= DMADESC_WRAP_MASK;
|
|
iudma->write_bd = iudma->bd_ring;
|
|
} else {
|
|
iudma->write_bd++;
|
|
}
|
|
iudma->n_bds_used++;
|
|
|
|
n_bytes = min_t(int, bytes_left, max_bd_bytes);
|
|
if (n_bytes)
|
|
dmaflags |= n_bytes << DMADESC_LENGTH_SHIFT;
|
|
else
|
|
dmaflags |= (1 << DMADESC_LENGTH_SHIFT) |
|
|
DMADESC_USB_ZERO_MASK;
|
|
|
|
dmaflags |= DMADESC_OWNER_MASK;
|
|
if (first_bd) {
|
|
dmaflags |= DMADESC_SOP_MASK;
|
|
first_bd = 0;
|
|
}
|
|
|
|
/*
|
|
* extra_zero_pkt forces one more iteration through the loop
|
|
* after all data is queued up, to send the zero packet
|
|
*/
|
|
if (extra_zero_pkt && !bytes_left)
|
|
extra_zero_pkt = 0;
|
|
|
|
if (!iudma->is_tx || iudma->n_bds_used == iudma->n_bds ||
|
|
(n_bytes == bytes_left && !extra_zero_pkt)) {
|
|
last_bd = 1;
|
|
dmaflags |= DMADESC_EOP_MASK;
|
|
}
|
|
|
|
d->address = breq->req.dma + breq->offset;
|
|
mb();
|
|
d->len_stat = dmaflags;
|
|
|
|
breq->offset += n_bytes;
|
|
breq->bd_bytes += n_bytes;
|
|
bytes_left -= n_bytes;
|
|
} while (!last_bd);
|
|
|
|
usb_dmac_writel(udc, ENETDMAC_CHANCFG_EN_MASK,
|
|
ENETDMAC_CHANCFG_REG(iudma->ch_idx));
|
|
}
|
|
|
|
/**
|
|
* iudma_read - Check for IUDMA buffer completion.
|
|
* @udc: Reference to the device controller.
|
|
* @iudma: IUDMA channel to use.
|
|
*
|
|
* This checks to see if ALL of the outstanding BDs on the DMA channel
|
|
* have been filled. If so, it returns the actual transfer length;
|
|
* otherwise it returns -EBUSY.
|
|
*/
|
|
static int iudma_read(struct bcm63xx_udc *udc, struct iudma_ch *iudma)
|
|
{
|
|
int i, actual_len = 0;
|
|
struct bcm_enet_desc *d = iudma->read_bd;
|
|
|
|
if (!iudma->n_bds_used)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < iudma->n_bds_used; i++) {
|
|
u32 dmaflags;
|
|
|
|
dmaflags = d->len_stat;
|
|
|
|
if (dmaflags & DMADESC_OWNER_MASK)
|
|
return -EBUSY;
|
|
|
|
actual_len += (dmaflags & DMADESC_LENGTH_MASK) >>
|
|
DMADESC_LENGTH_SHIFT;
|
|
if (d == iudma->end_bd)
|
|
d = iudma->bd_ring;
|
|
else
|
|
d++;
|
|
}
|
|
|
|
iudma->read_bd = d;
|
|
iudma->n_bds_used = 0;
|
|
return actual_len;
|
|
}
|
|
|
|
/**
|
|
* iudma_reset_channel - Stop DMA on a single channel.
|
|
* @udc: Reference to the device controller.
|
|
* @iudma: IUDMA channel to reset.
|
|
*/
|
|
static void iudma_reset_channel(struct bcm63xx_udc *udc, struct iudma_ch *iudma)
|
|
{
|
|
int timeout = IUDMA_RESET_TIMEOUT_US;
|
|
struct bcm_enet_desc *d;
|
|
int ch_idx = iudma->ch_idx;
|
|
|
|
if (!iudma->is_tx)
|
|
bcm63xx_fifo_reset_ep(udc, max(0, iudma->ep_num));
|
|
|
|
/* stop DMA, then wait for the hardware to wrap up */
|
|
usb_dmac_writel(udc, 0, ENETDMAC_CHANCFG_REG(ch_idx));
|
|
|
|
while (usb_dmac_readl(udc, ENETDMAC_CHANCFG_REG(ch_idx)) &
|
|
ENETDMAC_CHANCFG_EN_MASK) {
|
|
udelay(1);
|
|
|
|
/* repeatedly flush the FIFO data until the BD completes */
|
|
if (iudma->is_tx && iudma->ep_num >= 0)
|
|
bcm63xx_fifo_reset_ep(udc, iudma->ep_num);
|
|
|
|
if (!timeout--) {
|
|
dev_err(udc->dev, "can't reset IUDMA channel %d\n",
|
|
ch_idx);
|
|
break;
|
|
}
|
|
if (timeout == IUDMA_RESET_TIMEOUT_US / 2) {
|
|
dev_warn(udc->dev, "forcibly halting IUDMA channel %d\n",
|
|
ch_idx);
|
|
usb_dmac_writel(udc, ENETDMAC_CHANCFG_BUFHALT_MASK,
|
|
ENETDMAC_CHANCFG_REG(ch_idx));
|
|
}
|
|
}
|
|
usb_dmac_writel(udc, ~0, ENETDMAC_IR_REG(ch_idx));
|
|
|
|
/* don't leave "live" HW-owned entries for the next guy to step on */
|
|
for (d = iudma->bd_ring; d <= iudma->end_bd; d++)
|
|
d->len_stat = 0;
|
|
mb();
|
|
|
|
iudma->read_bd = iudma->write_bd = iudma->bd_ring;
|
|
iudma->n_bds_used = 0;
|
|
|
|
/* set up IRQs, UBUS burst size, and BD base for this channel */
|
|
usb_dmac_writel(udc, ENETDMAC_IR_BUFDONE_MASK,
|
|
ENETDMAC_IRMASK_REG(ch_idx));
|
|
usb_dmac_writel(udc, 8, ENETDMAC_MAXBURST_REG(ch_idx));
|
|
|
|
usb_dmas_writel(udc, iudma->bd_ring_dma, ENETDMAS_RSTART_REG(ch_idx));
|
|
usb_dmas_writel(udc, 0, ENETDMAS_SRAM2_REG(ch_idx));
|
|
}
|
|
|
|
/**
|
|
* iudma_init_channel - One-time IUDMA channel initialization.
|
|
* @udc: Reference to the device controller.
|
|
* @ch_idx: Channel to initialize.
|
|
*/
|
|
static int iudma_init_channel(struct bcm63xx_udc *udc, unsigned int ch_idx)
|
|
{
|
|
struct iudma_ch *iudma = &udc->iudma[ch_idx];
|
|
const struct iudma_ch_cfg *cfg = &iudma_defaults[ch_idx];
|
|
unsigned int n_bds = cfg->n_bds;
|
|
struct bcm63xx_ep *bep = NULL;
|
|
|
|
iudma->ep_num = cfg->ep_num;
|
|
iudma->ch_idx = ch_idx;
|
|
iudma->is_tx = !!(ch_idx & 0x01);
|
|
if (iudma->ep_num >= 0) {
|
|
bep = &udc->bep[iudma->ep_num];
|
|
bep->iudma = iudma;
|
|
INIT_LIST_HEAD(&bep->queue);
|
|
}
|
|
|
|
iudma->bep = bep;
|
|
iudma->udc = udc;
|
|
|
|
/* ep0 is always active; others are controlled by the gadget driver */
|
|
if (iudma->ep_num <= 0)
|
|
iudma->enabled = true;
|
|
|
|
iudma->n_bds = n_bds;
|
|
iudma->bd_ring = dmam_alloc_coherent(udc->dev,
|
|
n_bds * sizeof(struct bcm_enet_desc),
|
|
&iudma->bd_ring_dma, GFP_KERNEL);
|
|
if (!iudma->bd_ring)
|
|
return -ENOMEM;
|
|
iudma->end_bd = &iudma->bd_ring[n_bds - 1];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iudma_init - One-time initialization of all IUDMA channels.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* Enable DMA, flush channels, and enable global IUDMA IRQs.
|
|
*/
|
|
static int iudma_init(struct bcm63xx_udc *udc)
|
|
{
|
|
int i, rc;
|
|
|
|
usb_dma_writel(udc, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
|
|
|
|
for (i = 0; i < BCM63XX_NUM_IUDMA; i++) {
|
|
rc = iudma_init_channel(udc, i);
|
|
if (rc)
|
|
return rc;
|
|
iudma_reset_channel(udc, &udc->iudma[i]);
|
|
}
|
|
|
|
usb_dma_writel(udc, BIT(BCM63XX_NUM_IUDMA)-1, ENETDMA_GLB_IRQMASK_REG);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iudma_uninit - Uninitialize IUDMA channels.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* Kill global IUDMA IRQs, flush channels, and kill DMA.
|
|
*/
|
|
static void iudma_uninit(struct bcm63xx_udc *udc)
|
|
{
|
|
int i;
|
|
|
|
usb_dma_writel(udc, 0, ENETDMA_GLB_IRQMASK_REG);
|
|
|
|
for (i = 0; i < BCM63XX_NUM_IUDMA; i++)
|
|
iudma_reset_channel(udc, &udc->iudma[i]);
|
|
|
|
usb_dma_writel(udc, 0, ENETDMA_CFG_REG);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Other low-level USBD operations
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_set_ctrl_irqs - Mask/unmask control path interrupts.
|
|
* @udc: Reference to the device controller.
|
|
* @enable_irqs: true to enable, false to disable.
|
|
*/
|
|
static void bcm63xx_set_ctrl_irqs(struct bcm63xx_udc *udc, bool enable_irqs)
|
|
{
|
|
u32 val;
|
|
|
|
usbd_writel(udc, 0, USBD_STATUS_REG);
|
|
|
|
val = BIT(USBD_EVENT_IRQ_USB_RESET) |
|
|
BIT(USBD_EVENT_IRQ_SETUP) |
|
|
BIT(USBD_EVENT_IRQ_SETCFG) |
|
|
BIT(USBD_EVENT_IRQ_SETINTF) |
|
|
BIT(USBD_EVENT_IRQ_USB_LINK);
|
|
usbd_writel(udc, enable_irqs ? val : 0, USBD_EVENT_IRQ_MASK_REG);
|
|
usbd_writel(udc, val, USBD_EVENT_IRQ_STATUS_REG);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_select_phy_mode - Select between USB device and host mode.
|
|
* @udc: Reference to the device controller.
|
|
* @is_device: true for device, false for host.
|
|
*
|
|
* This should probably be reworked to use the drivers/usb/otg
|
|
* infrastructure.
|
|
*
|
|
* By default, the AFE/pullups are disabled in device mode, until
|
|
* bcm63xx_select_pullup() is called.
|
|
*/
|
|
static void bcm63xx_select_phy_mode(struct bcm63xx_udc *udc, bool is_device)
|
|
{
|
|
u32 val, portmask = BIT(udc->pd->port_no);
|
|
|
|
if (BCMCPU_IS_6328()) {
|
|
/* configure pinmux to sense VBUS signal */
|
|
val = bcm_gpio_readl(GPIO_PINMUX_OTHR_REG);
|
|
val &= ~GPIO_PINMUX_OTHR_6328_USB_MASK;
|
|
val |= is_device ? GPIO_PINMUX_OTHR_6328_USB_DEV :
|
|
GPIO_PINMUX_OTHR_6328_USB_HOST;
|
|
bcm_gpio_writel(val, GPIO_PINMUX_OTHR_REG);
|
|
}
|
|
|
|
val = bcm_rset_readl(RSET_USBH_PRIV, USBH_PRIV_UTMI_CTL_6368_REG);
|
|
if (is_device) {
|
|
val |= (portmask << USBH_PRIV_UTMI_CTL_HOSTB_SHIFT);
|
|
val |= (portmask << USBH_PRIV_UTMI_CTL_NODRIV_SHIFT);
|
|
} else {
|
|
val &= ~(portmask << USBH_PRIV_UTMI_CTL_HOSTB_SHIFT);
|
|
val &= ~(portmask << USBH_PRIV_UTMI_CTL_NODRIV_SHIFT);
|
|
}
|
|
bcm_rset_writel(RSET_USBH_PRIV, val, USBH_PRIV_UTMI_CTL_6368_REG);
|
|
|
|
val = bcm_rset_readl(RSET_USBH_PRIV, USBH_PRIV_SWAP_6368_REG);
|
|
if (is_device)
|
|
val |= USBH_PRIV_SWAP_USBD_MASK;
|
|
else
|
|
val &= ~USBH_PRIV_SWAP_USBD_MASK;
|
|
bcm_rset_writel(RSET_USBH_PRIV, val, USBH_PRIV_SWAP_6368_REG);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_select_pullup - Enable/disable the pullup on D+
|
|
* @udc: Reference to the device controller.
|
|
* @is_on: true to enable the pullup, false to disable.
|
|
*
|
|
* If the pullup is active, the host will sense a FS/HS device connected to
|
|
* the port. If the pullup is inactive, the host will think the USB
|
|
* device has been disconnected.
|
|
*/
|
|
static void bcm63xx_select_pullup(struct bcm63xx_udc *udc, bool is_on)
|
|
{
|
|
u32 val, portmask = BIT(udc->pd->port_no);
|
|
|
|
val = bcm_rset_readl(RSET_USBH_PRIV, USBH_PRIV_UTMI_CTL_6368_REG);
|
|
if (is_on)
|
|
val &= ~(portmask << USBH_PRIV_UTMI_CTL_NODRIV_SHIFT);
|
|
else
|
|
val |= (portmask << USBH_PRIV_UTMI_CTL_NODRIV_SHIFT);
|
|
bcm_rset_writel(RSET_USBH_PRIV, val, USBH_PRIV_UTMI_CTL_6368_REG);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_uninit_udc_hw - Shut down the hardware prior to driver removal.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* This just masks the IUDMA IRQs and releases the clocks. It is assumed
|
|
* that bcm63xx_udc_stop() has already run, and the clocks are stopped.
|
|
*/
|
|
static void bcm63xx_uninit_udc_hw(struct bcm63xx_udc *udc)
|
|
{
|
|
set_clocks(udc, true);
|
|
iudma_uninit(udc);
|
|
set_clocks(udc, false);
|
|
|
|
clk_put(udc->usbd_clk);
|
|
clk_put(udc->usbh_clk);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_init_udc_hw - Initialize the controller hardware and data structures.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static int bcm63xx_init_udc_hw(struct bcm63xx_udc *udc)
|
|
{
|
|
int i, rc = 0;
|
|
u32 val;
|
|
|
|
udc->ep0_ctrl_buf = devm_kzalloc(udc->dev, BCM63XX_MAX_CTRL_PKT,
|
|
GFP_KERNEL);
|
|
if (!udc->ep0_ctrl_buf)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&udc->gadget.ep_list);
|
|
for (i = 0; i < BCM63XX_NUM_EP; i++) {
|
|
struct bcm63xx_ep *bep = &udc->bep[i];
|
|
|
|
bep->ep.name = bcm63xx_ep_name[i];
|
|
bep->ep_num = i;
|
|
bep->ep.ops = &bcm63xx_udc_ep_ops;
|
|
list_add_tail(&bep->ep.ep_list, &udc->gadget.ep_list);
|
|
bep->halted = 0;
|
|
bep->ep.maxpacket = BCM63XX_MAX_CTRL_PKT;
|
|
bep->udc = udc;
|
|
bep->ep.desc = NULL;
|
|
INIT_LIST_HEAD(&bep->queue);
|
|
}
|
|
|
|
udc->gadget.ep0 = &udc->bep[0].ep;
|
|
list_del(&udc->bep[0].ep.ep_list);
|
|
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
udc->ep0state = EP0_SHUTDOWN;
|
|
|
|
udc->usbh_clk = clk_get(udc->dev, "usbh");
|
|
if (IS_ERR(udc->usbh_clk))
|
|
return -EIO;
|
|
|
|
udc->usbd_clk = clk_get(udc->dev, "usbd");
|
|
if (IS_ERR(udc->usbd_clk)) {
|
|
clk_put(udc->usbh_clk);
|
|
return -EIO;
|
|
}
|
|
|
|
set_clocks(udc, true);
|
|
|
|
val = USBD_CONTROL_AUTO_CSRS_MASK |
|
|
USBD_CONTROL_DONE_CSRS_MASK |
|
|
(irq_coalesce ? USBD_CONTROL_RXZSCFG_MASK : 0);
|
|
usbd_writel(udc, val, USBD_CONTROL_REG);
|
|
|
|
val = USBD_STRAPS_APP_SELF_PWR_MASK |
|
|
USBD_STRAPS_APP_RAM_IF_MASK |
|
|
USBD_STRAPS_APP_CSRPRGSUP_MASK |
|
|
USBD_STRAPS_APP_8BITPHY_MASK |
|
|
USBD_STRAPS_APP_RMTWKUP_MASK;
|
|
|
|
if (udc->gadget.max_speed == USB_SPEED_HIGH)
|
|
val |= (BCM63XX_SPD_HIGH << USBD_STRAPS_SPEED_SHIFT);
|
|
else
|
|
val |= (BCM63XX_SPD_FULL << USBD_STRAPS_SPEED_SHIFT);
|
|
usbd_writel(udc, val, USBD_STRAPS_REG);
|
|
|
|
bcm63xx_set_ctrl_irqs(udc, false);
|
|
|
|
usbd_writel(udc, 0, USBD_EVENT_IRQ_CFG_LO_REG);
|
|
|
|
val = USBD_EVENT_IRQ_CFG_FALLING(USBD_EVENT_IRQ_ENUM_ON) |
|
|
USBD_EVENT_IRQ_CFG_FALLING(USBD_EVENT_IRQ_SET_CSRS);
|
|
usbd_writel(udc, val, USBD_EVENT_IRQ_CFG_HI_REG);
|
|
|
|
rc = iudma_init(udc);
|
|
set_clocks(udc, false);
|
|
if (rc)
|
|
bcm63xx_uninit_udc_hw(udc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Standard EP gadget operations
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_ep_enable - Enable one endpoint.
|
|
* @ep: Endpoint to enable.
|
|
* @desc: Contains max packet, direction, etc.
|
|
*
|
|
* Most of the endpoint parameters are fixed in this controller, so there
|
|
* isn't much for this function to do.
|
|
*/
|
|
static int bcm63xx_ep_enable(struct usb_ep *ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
struct iudma_ch *iudma = bep->iudma;
|
|
unsigned long flags;
|
|
|
|
if (!ep || !desc || ep->name == bcm63xx_ep0name)
|
|
return -EINVAL;
|
|
|
|
if (!udc->driver)
|
|
return -ESHUTDOWN;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
if (iudma->enabled) {
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iudma->enabled = true;
|
|
BUG_ON(!list_empty(&bep->queue));
|
|
|
|
iudma_reset_channel(udc, iudma);
|
|
|
|
bep->halted = 0;
|
|
bcm63xx_set_stall(udc, bep, false);
|
|
clear_bit(bep->ep_num, &udc->wedgemap);
|
|
|
|
ep->desc = desc;
|
|
ep->maxpacket = usb_endpoint_maxp(desc);
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep_disable - Disable one endpoint.
|
|
* @ep: Endpoint to disable.
|
|
*/
|
|
static int bcm63xx_ep_disable(struct usb_ep *ep)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
struct iudma_ch *iudma = bep->iudma;
|
|
struct list_head *pos, *n;
|
|
unsigned long flags;
|
|
|
|
if (!ep || !ep->desc)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
if (!iudma->enabled) {
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
iudma->enabled = false;
|
|
|
|
iudma_reset_channel(udc, iudma);
|
|
|
|
if (!list_empty(&bep->queue)) {
|
|
list_for_each_safe(pos, n, &bep->queue) {
|
|
struct bcm63xx_req *breq =
|
|
list_entry(pos, struct bcm63xx_req, queue);
|
|
|
|
usb_gadget_unmap_request(&udc->gadget, &breq->req,
|
|
iudma->is_tx);
|
|
list_del(&breq->queue);
|
|
breq->req.status = -ESHUTDOWN;
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
breq->req.complete(&iudma->bep->ep, &breq->req);
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
}
|
|
}
|
|
ep->desc = NULL;
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_alloc_request - Allocate a new request.
|
|
* @ep: Endpoint associated with the request.
|
|
* @mem_flags: Flags to pass to kzalloc().
|
|
*/
|
|
static struct usb_request *bcm63xx_udc_alloc_request(struct usb_ep *ep,
|
|
gfp_t mem_flags)
|
|
{
|
|
struct bcm63xx_req *breq;
|
|
|
|
breq = kzalloc(sizeof(*breq), mem_flags);
|
|
if (!breq)
|
|
return NULL;
|
|
return &breq->req;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_free_request - Free a request.
|
|
* @ep: Endpoint associated with the request.
|
|
* @req: Request to free.
|
|
*/
|
|
static void bcm63xx_udc_free_request(struct usb_ep *ep,
|
|
struct usb_request *req)
|
|
{
|
|
struct bcm63xx_req *breq = our_req(req);
|
|
kfree(breq);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_queue - Queue up a new request.
|
|
* @ep: Endpoint associated with the request.
|
|
* @req: Request to add.
|
|
* @mem_flags: Unused.
|
|
*
|
|
* If the queue is empty, start this request immediately. Otherwise, add
|
|
* it to the list.
|
|
*
|
|
* ep0 replies are sent through this function from the gadget driver, but
|
|
* they are treated differently because they need to be handled by the ep0
|
|
* state machine. (Sometimes they are replies to control requests that
|
|
* were spoofed by this driver, and so they shouldn't be transmitted at all.)
|
|
*/
|
|
static int bcm63xx_udc_queue(struct usb_ep *ep, struct usb_request *req,
|
|
gfp_t mem_flags)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
struct bcm63xx_req *breq = our_req(req);
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
if (unlikely(!req || !req->complete || !req->buf || !ep))
|
|
return -EINVAL;
|
|
|
|
req->actual = 0;
|
|
req->status = 0;
|
|
breq->offset = 0;
|
|
|
|
if (bep == &udc->bep[0]) {
|
|
/* only one reply per request, please */
|
|
if (udc->ep0_reply)
|
|
return -EINVAL;
|
|
|
|
udc->ep0_reply = req;
|
|
schedule_work(&udc->ep0_wq);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
if (!bep->iudma->enabled) {
|
|
rc = -ESHUTDOWN;
|
|
goto out;
|
|
}
|
|
|
|
rc = usb_gadget_map_request(&udc->gadget, req, bep->iudma->is_tx);
|
|
if (rc == 0) {
|
|
list_add_tail(&breq->queue, &bep->queue);
|
|
if (list_is_singular(&bep->queue))
|
|
iudma_write(udc, bep->iudma, breq);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_dequeue - Remove a pending request from the queue.
|
|
* @ep: Endpoint associated with the request.
|
|
* @req: Request to remove.
|
|
*
|
|
* If the request is not at the head of the queue, this is easy - just nuke
|
|
* it. If the request is at the head of the queue, we'll need to stop the
|
|
* DMA transaction and then queue up the successor.
|
|
*/
|
|
static int bcm63xx_udc_dequeue(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
struct bcm63xx_req *breq = our_req(req), *cur;
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
if (list_empty(&bep->queue)) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
cur = list_first_entry(&bep->queue, struct bcm63xx_req, queue);
|
|
usb_gadget_unmap_request(&udc->gadget, &breq->req, bep->iudma->is_tx);
|
|
|
|
if (breq == cur) {
|
|
iudma_reset_channel(udc, bep->iudma);
|
|
list_del(&breq->queue);
|
|
|
|
if (!list_empty(&bep->queue)) {
|
|
struct bcm63xx_req *next;
|
|
|
|
next = list_first_entry(&bep->queue,
|
|
struct bcm63xx_req, queue);
|
|
iudma_write(udc, bep->iudma, next);
|
|
}
|
|
} else {
|
|
list_del(&breq->queue);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
req->status = -ESHUTDOWN;
|
|
req->complete(ep, req);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_set_halt - Enable/disable STALL flag in the hardware.
|
|
* @ep: Endpoint to halt.
|
|
* @value: Zero to clear halt; nonzero to set halt.
|
|
*
|
|
* See comments in bcm63xx_update_wedge().
|
|
*/
|
|
static int bcm63xx_udc_set_halt(struct usb_ep *ep, int value)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
bcm63xx_set_stall(udc, bep, !!value);
|
|
bep->halted = value;
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_set_wedge - Stall the endpoint until the next reset.
|
|
* @ep: Endpoint to wedge.
|
|
*
|
|
* See comments in bcm63xx_update_wedge().
|
|
*/
|
|
static int bcm63xx_udc_set_wedge(struct usb_ep *ep)
|
|
{
|
|
struct bcm63xx_ep *bep = our_ep(ep);
|
|
struct bcm63xx_udc *udc = bep->udc;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
set_bit(bep->ep_num, &udc->wedgemap);
|
|
bcm63xx_set_stall(udc, bep, true);
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct usb_ep_ops bcm63xx_udc_ep_ops = {
|
|
.enable = bcm63xx_ep_enable,
|
|
.disable = bcm63xx_ep_disable,
|
|
|
|
.alloc_request = bcm63xx_udc_alloc_request,
|
|
.free_request = bcm63xx_udc_free_request,
|
|
|
|
.queue = bcm63xx_udc_queue,
|
|
.dequeue = bcm63xx_udc_dequeue,
|
|
|
|
.set_halt = bcm63xx_udc_set_halt,
|
|
.set_wedge = bcm63xx_udc_set_wedge,
|
|
};
|
|
|
|
/***********************************************************************
|
|
* EP0 handling
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_ep0_setup_callback - Drop spinlock to invoke ->setup callback.
|
|
* @udc: Reference to the device controller.
|
|
* @ctrl: 8-byte SETUP request.
|
|
*/
|
|
static int bcm63xx_ep0_setup_callback(struct bcm63xx_udc *udc,
|
|
struct usb_ctrlrequest *ctrl)
|
|
{
|
|
int rc;
|
|
|
|
spin_unlock_irq(&udc->lock);
|
|
rc = udc->driver->setup(&udc->gadget, ctrl);
|
|
spin_lock_irq(&udc->lock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_spoof_set_cfg - Synthesize a SET_CONFIGURATION request.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* Many standard requests are handled automatically in the hardware, but
|
|
* we still need to pass them to the gadget driver so that it can
|
|
* reconfigure the interfaces/endpoints if necessary.
|
|
*
|
|
* Unfortunately we are not able to send a STALL response if the host
|
|
* requests an invalid configuration. If this happens, we'll have to be
|
|
* content with printing a warning.
|
|
*/
|
|
static int bcm63xx_ep0_spoof_set_cfg(struct bcm63xx_udc *udc)
|
|
{
|
|
struct usb_ctrlrequest ctrl;
|
|
int rc;
|
|
|
|
ctrl.bRequestType = USB_DIR_OUT | USB_RECIP_DEVICE;
|
|
ctrl.bRequest = USB_REQ_SET_CONFIGURATION;
|
|
ctrl.wValue = cpu_to_le16(udc->cfg);
|
|
ctrl.wIndex = 0;
|
|
ctrl.wLength = 0;
|
|
|
|
rc = bcm63xx_ep0_setup_callback(udc, &ctrl);
|
|
if (rc < 0) {
|
|
dev_warn_ratelimited(udc->dev,
|
|
"hardware auto-acked bad SET_CONFIGURATION(%d) request\n",
|
|
udc->cfg);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_spoof_set_iface - Synthesize a SET_INTERFACE request.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static int bcm63xx_ep0_spoof_set_iface(struct bcm63xx_udc *udc)
|
|
{
|
|
struct usb_ctrlrequest ctrl;
|
|
int rc;
|
|
|
|
ctrl.bRequestType = USB_DIR_OUT | USB_RECIP_INTERFACE;
|
|
ctrl.bRequest = USB_REQ_SET_INTERFACE;
|
|
ctrl.wValue = cpu_to_le16(udc->alt_iface);
|
|
ctrl.wIndex = cpu_to_le16(udc->iface);
|
|
ctrl.wLength = 0;
|
|
|
|
rc = bcm63xx_ep0_setup_callback(udc, &ctrl);
|
|
if (rc < 0) {
|
|
dev_warn_ratelimited(udc->dev,
|
|
"hardware auto-acked bad SET_INTERFACE(%d,%d) request\n",
|
|
udc->iface, udc->alt_iface);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_map_write - dma_map and iudma_write a single request.
|
|
* @udc: Reference to the device controller.
|
|
* @ch_idx: IUDMA channel number.
|
|
* @req: USB gadget layer representation of the request.
|
|
*/
|
|
static void bcm63xx_ep0_map_write(struct bcm63xx_udc *udc, int ch_idx,
|
|
struct usb_request *req)
|
|
{
|
|
struct bcm63xx_req *breq = our_req(req);
|
|
struct iudma_ch *iudma = &udc->iudma[ch_idx];
|
|
|
|
BUG_ON(udc->ep0_request);
|
|
udc->ep0_request = req;
|
|
|
|
req->actual = 0;
|
|
breq->offset = 0;
|
|
usb_gadget_map_request(&udc->gadget, req, iudma->is_tx);
|
|
iudma_write(udc, iudma, breq);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_complete - Set completion status and "stage" the callback.
|
|
* @udc: Reference to the device controller.
|
|
* @req: USB gadget layer representation of the request.
|
|
* @status: Status to return to the gadget driver.
|
|
*/
|
|
static void bcm63xx_ep0_complete(struct bcm63xx_udc *udc,
|
|
struct usb_request *req, int status)
|
|
{
|
|
req->status = status;
|
|
if (status)
|
|
req->actual = 0;
|
|
if (req->complete) {
|
|
spin_unlock_irq(&udc->lock);
|
|
req->complete(&udc->bep[0].ep, req);
|
|
spin_lock_irq(&udc->lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_nuke_reply - Abort request from the gadget driver due to
|
|
* reset/shutdown.
|
|
* @udc: Reference to the device controller.
|
|
* @is_tx: Nonzero for TX (IN), zero for RX (OUT).
|
|
*/
|
|
static void bcm63xx_ep0_nuke_reply(struct bcm63xx_udc *udc, int is_tx)
|
|
{
|
|
struct usb_request *req = udc->ep0_reply;
|
|
|
|
udc->ep0_reply = NULL;
|
|
usb_gadget_unmap_request(&udc->gadget, req, is_tx);
|
|
if (udc->ep0_request == req) {
|
|
udc->ep0_req_completed = 0;
|
|
udc->ep0_request = NULL;
|
|
}
|
|
bcm63xx_ep0_complete(udc, req, -ESHUTDOWN);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_read_complete - Close out the pending ep0 request; return
|
|
* transfer len.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static int bcm63xx_ep0_read_complete(struct bcm63xx_udc *udc)
|
|
{
|
|
struct usb_request *req = udc->ep0_request;
|
|
|
|
udc->ep0_req_completed = 0;
|
|
udc->ep0_request = NULL;
|
|
|
|
return req->actual;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_internal_request - Helper function to submit an ep0 request.
|
|
* @udc: Reference to the device controller.
|
|
* @ch_idx: IUDMA channel number.
|
|
* @length: Number of bytes to TX/RX.
|
|
*
|
|
* Used for simple transfers performed by the ep0 worker. This will always
|
|
* use ep0_ctrl_req / ep0_ctrl_buf.
|
|
*/
|
|
static void bcm63xx_ep0_internal_request(struct bcm63xx_udc *udc, int ch_idx,
|
|
int length)
|
|
{
|
|
struct usb_request *req = &udc->ep0_ctrl_req.req;
|
|
|
|
req->buf = udc->ep0_ctrl_buf;
|
|
req->length = length;
|
|
req->complete = NULL;
|
|
|
|
bcm63xx_ep0_map_write(udc, ch_idx, req);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_do_setup - Parse new SETUP packet and decide how to handle it.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* EP0_IDLE probably shouldn't ever happen. EP0_REQUEUE means we're ready
|
|
* for the next packet. Anything else means the transaction requires multiple
|
|
* stages of handling.
|
|
*/
|
|
static enum bcm63xx_ep0_state bcm63xx_ep0_do_setup(struct bcm63xx_udc *udc)
|
|
{
|
|
int rc;
|
|
struct usb_ctrlrequest *ctrl = (void *)udc->ep0_ctrl_buf;
|
|
|
|
rc = bcm63xx_ep0_read_complete(udc);
|
|
|
|
if (rc < 0) {
|
|
dev_err(udc->dev, "missing SETUP packet\n");
|
|
return EP0_IDLE;
|
|
}
|
|
|
|
/*
|
|
* Handle 0-byte IN STATUS acknowledgement. The hardware doesn't
|
|
* ALWAYS deliver these 100% of the time, so if we happen to see one,
|
|
* just throw it away.
|
|
*/
|
|
if (rc == 0)
|
|
return EP0_REQUEUE;
|
|
|
|
/* Drop malformed SETUP packets */
|
|
if (rc != sizeof(*ctrl)) {
|
|
dev_warn_ratelimited(udc->dev,
|
|
"malformed SETUP packet (%d bytes)\n", rc);
|
|
return EP0_REQUEUE;
|
|
}
|
|
|
|
/* Process new SETUP packet arriving on ep0 */
|
|
rc = bcm63xx_ep0_setup_callback(udc, ctrl);
|
|
if (rc < 0) {
|
|
bcm63xx_set_stall(udc, &udc->bep[0], true);
|
|
return EP0_REQUEUE;
|
|
}
|
|
|
|
if (!ctrl->wLength)
|
|
return EP0_REQUEUE;
|
|
else if (ctrl->bRequestType & USB_DIR_IN)
|
|
return EP0_IN_DATA_PHASE_SETUP;
|
|
else
|
|
return EP0_OUT_DATA_PHASE_SETUP;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_do_idle - Check for outstanding requests if ep0 is idle.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* In state EP0_IDLE, the RX descriptor is either pending, or has been
|
|
* filled with a SETUP packet from the host. This function handles new
|
|
* SETUP packets, control IRQ events (which can generate fake SETUP packets),
|
|
* and reset/shutdown events.
|
|
*
|
|
* Returns 0 if work was done; -EAGAIN if nothing to do.
|
|
*/
|
|
static int bcm63xx_ep0_do_idle(struct bcm63xx_udc *udc)
|
|
{
|
|
if (udc->ep0_req_reset) {
|
|
udc->ep0_req_reset = 0;
|
|
} else if (udc->ep0_req_set_cfg) {
|
|
udc->ep0_req_set_cfg = 0;
|
|
if (bcm63xx_ep0_spoof_set_cfg(udc) >= 0)
|
|
udc->ep0state = EP0_IN_FAKE_STATUS_PHASE;
|
|
} else if (udc->ep0_req_set_iface) {
|
|
udc->ep0_req_set_iface = 0;
|
|
if (bcm63xx_ep0_spoof_set_iface(udc) >= 0)
|
|
udc->ep0state = EP0_IN_FAKE_STATUS_PHASE;
|
|
} else if (udc->ep0_req_completed) {
|
|
udc->ep0state = bcm63xx_ep0_do_setup(udc);
|
|
return udc->ep0state == EP0_IDLE ? -EAGAIN : 0;
|
|
} else if (udc->ep0_req_shutdown) {
|
|
udc->ep0_req_shutdown = 0;
|
|
udc->ep0_req_completed = 0;
|
|
udc->ep0_request = NULL;
|
|
iudma_reset_channel(udc, &udc->iudma[IUDMA_EP0_RXCHAN]);
|
|
usb_gadget_unmap_request(&udc->gadget,
|
|
&udc->ep0_ctrl_req.req, 0);
|
|
|
|
/* bcm63xx_udc_pullup() is waiting for this */
|
|
mb();
|
|
udc->ep0state = EP0_SHUTDOWN;
|
|
} else if (udc->ep0_reply) {
|
|
/*
|
|
* This could happen if a USB RESET shows up during an ep0
|
|
* transaction (especially if a laggy driver like gadgetfs
|
|
* is in use).
|
|
*/
|
|
dev_warn(udc->dev, "nuking unexpected reply\n");
|
|
bcm63xx_ep0_nuke_reply(udc, 0);
|
|
} else {
|
|
return -EAGAIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_one_round - Handle the current ep0 state.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* Returns 0 if work was done; -EAGAIN if nothing to do.
|
|
*/
|
|
static int bcm63xx_ep0_one_round(struct bcm63xx_udc *udc)
|
|
{
|
|
enum bcm63xx_ep0_state ep0state = udc->ep0state;
|
|
bool shutdown = udc->ep0_req_reset || udc->ep0_req_shutdown;
|
|
|
|
switch (udc->ep0state) {
|
|
case EP0_REQUEUE:
|
|
/* set up descriptor to receive SETUP packet */
|
|
bcm63xx_ep0_internal_request(udc, IUDMA_EP0_RXCHAN,
|
|
BCM63XX_MAX_CTRL_PKT);
|
|
ep0state = EP0_IDLE;
|
|
break;
|
|
case EP0_IDLE:
|
|
return bcm63xx_ep0_do_idle(udc);
|
|
case EP0_IN_DATA_PHASE_SETUP:
|
|
/*
|
|
* Normal case: TX request is in ep0_reply (queued by the
|
|
* callback), or will be queued shortly. When it's here,
|
|
* send it to the HW and go to EP0_IN_DATA_PHASE_COMPLETE.
|
|
*
|
|
* Shutdown case: Stop waiting for the reply. Just
|
|
* REQUEUE->IDLE. The gadget driver is NOT expected to
|
|
* queue anything else now.
|
|
*/
|
|
if (udc->ep0_reply) {
|
|
bcm63xx_ep0_map_write(udc, IUDMA_EP0_TXCHAN,
|
|
udc->ep0_reply);
|
|
ep0state = EP0_IN_DATA_PHASE_COMPLETE;
|
|
} else if (shutdown) {
|
|
ep0state = EP0_REQUEUE;
|
|
}
|
|
break;
|
|
case EP0_IN_DATA_PHASE_COMPLETE: {
|
|
/*
|
|
* Normal case: TX packet (ep0_reply) is in flight; wait for
|
|
* it to finish, then go back to REQUEUE->IDLE.
|
|
*
|
|
* Shutdown case: Reset the TX channel, send -ESHUTDOWN
|
|
* completion to the gadget driver, then REQUEUE->IDLE.
|
|
*/
|
|
if (udc->ep0_req_completed) {
|
|
udc->ep0_reply = NULL;
|
|
bcm63xx_ep0_read_complete(udc);
|
|
/*
|
|
* the "ack" sometimes gets eaten (see
|
|
* bcm63xx_ep0_do_idle)
|
|
*/
|
|
ep0state = EP0_REQUEUE;
|
|
} else if (shutdown) {
|
|
iudma_reset_channel(udc, &udc->iudma[IUDMA_EP0_TXCHAN]);
|
|
bcm63xx_ep0_nuke_reply(udc, 1);
|
|
ep0state = EP0_REQUEUE;
|
|
}
|
|
break;
|
|
}
|
|
case EP0_OUT_DATA_PHASE_SETUP:
|
|
/* Similar behavior to EP0_IN_DATA_PHASE_SETUP */
|
|
if (udc->ep0_reply) {
|
|
bcm63xx_ep0_map_write(udc, IUDMA_EP0_RXCHAN,
|
|
udc->ep0_reply);
|
|
ep0state = EP0_OUT_DATA_PHASE_COMPLETE;
|
|
} else if (shutdown) {
|
|
ep0state = EP0_REQUEUE;
|
|
}
|
|
break;
|
|
case EP0_OUT_DATA_PHASE_COMPLETE: {
|
|
/* Similar behavior to EP0_IN_DATA_PHASE_COMPLETE */
|
|
if (udc->ep0_req_completed) {
|
|
udc->ep0_reply = NULL;
|
|
bcm63xx_ep0_read_complete(udc);
|
|
|
|
/* send 0-byte ack to host */
|
|
bcm63xx_ep0_internal_request(udc, IUDMA_EP0_TXCHAN, 0);
|
|
ep0state = EP0_OUT_STATUS_PHASE;
|
|
} else if (shutdown) {
|
|
iudma_reset_channel(udc, &udc->iudma[IUDMA_EP0_RXCHAN]);
|
|
bcm63xx_ep0_nuke_reply(udc, 0);
|
|
ep0state = EP0_REQUEUE;
|
|
}
|
|
break;
|
|
}
|
|
case EP0_OUT_STATUS_PHASE:
|
|
/*
|
|
* Normal case: 0-byte OUT ack packet is in flight; wait
|
|
* for it to finish, then go back to REQUEUE->IDLE.
|
|
*
|
|
* Shutdown case: just cancel the transmission. Don't bother
|
|
* calling the completion, because it originated from this
|
|
* function anyway. Then go back to REQUEUE->IDLE.
|
|
*/
|
|
if (udc->ep0_req_completed) {
|
|
bcm63xx_ep0_read_complete(udc);
|
|
ep0state = EP0_REQUEUE;
|
|
} else if (shutdown) {
|
|
iudma_reset_channel(udc, &udc->iudma[IUDMA_EP0_TXCHAN]);
|
|
udc->ep0_request = NULL;
|
|
ep0state = EP0_REQUEUE;
|
|
}
|
|
break;
|
|
case EP0_IN_FAKE_STATUS_PHASE: {
|
|
/*
|
|
* Normal case: we spoofed a SETUP packet and are now
|
|
* waiting for the gadget driver to send a 0-byte reply.
|
|
* This doesn't actually get sent to the HW because the
|
|
* HW has already sent its own reply. Once we get the
|
|
* response, return to IDLE.
|
|
*
|
|
* Shutdown case: return to IDLE immediately.
|
|
*
|
|
* Note that the ep0 RX descriptor has remained queued
|
|
* (and possibly unfilled) during this entire transaction.
|
|
* The HW datapath (IUDMA) never even sees SET_CONFIGURATION
|
|
* or SET_INTERFACE transactions.
|
|
*/
|
|
struct usb_request *r = udc->ep0_reply;
|
|
|
|
if (!r) {
|
|
if (shutdown)
|
|
ep0state = EP0_IDLE;
|
|
break;
|
|
}
|
|
|
|
bcm63xx_ep0_complete(udc, r, 0);
|
|
udc->ep0_reply = NULL;
|
|
ep0state = EP0_IDLE;
|
|
break;
|
|
}
|
|
case EP0_SHUTDOWN:
|
|
break;
|
|
}
|
|
|
|
if (udc->ep0state == ep0state)
|
|
return -EAGAIN;
|
|
|
|
udc->ep0state = ep0state;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_ep0_process - ep0 worker thread / state machine.
|
|
* @w: Workqueue struct.
|
|
*
|
|
* bcm63xx_ep0_process is triggered any time an event occurs on ep0. It
|
|
* is used to synchronize ep0 events and ensure that both HW and SW events
|
|
* occur in a well-defined order. When the ep0 IUDMA queues are idle, it may
|
|
* synthesize SET_CONFIGURATION / SET_INTERFACE requests that were consumed
|
|
* by the USBD hardware.
|
|
*
|
|
* The worker function will continue iterating around the state machine
|
|
* until there is nothing left to do. Usually "nothing left to do" means
|
|
* that we're waiting for a new event from the hardware.
|
|
*/
|
|
static void bcm63xx_ep0_process(struct work_struct *w)
|
|
{
|
|
struct bcm63xx_udc *udc = container_of(w, struct bcm63xx_udc, ep0_wq);
|
|
spin_lock_irq(&udc->lock);
|
|
while (bcm63xx_ep0_one_round(udc) == 0)
|
|
;
|
|
spin_unlock_irq(&udc->lock);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Standard UDC gadget operations
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_udc_get_frame - Read current SOF frame number from the HW.
|
|
* @gadget: USB slave device.
|
|
*/
|
|
static int bcm63xx_udc_get_frame(struct usb_gadget *gadget)
|
|
{
|
|
struct bcm63xx_udc *udc = gadget_to_udc(gadget);
|
|
|
|
return (usbd_readl(udc, USBD_STATUS_REG) &
|
|
USBD_STATUS_SOF_MASK) >> USBD_STATUS_SOF_SHIFT;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_pullup - Enable/disable pullup on D+ line.
|
|
* @gadget: USB slave device.
|
|
* @is_on: 0 to disable pullup, 1 to enable.
|
|
*
|
|
* See notes in bcm63xx_select_pullup().
|
|
*/
|
|
static int bcm63xx_udc_pullup(struct usb_gadget *gadget, int is_on)
|
|
{
|
|
struct bcm63xx_udc *udc = gadget_to_udc(gadget);
|
|
unsigned long flags;
|
|
int i, rc = -EINVAL;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
if (is_on && udc->ep0state == EP0_SHUTDOWN) {
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
udc->ep0state = EP0_REQUEUE;
|
|
bcm63xx_fifo_setup(udc);
|
|
bcm63xx_fifo_reset(udc);
|
|
bcm63xx_ep_setup(udc);
|
|
|
|
bitmap_zero(&udc->wedgemap, BCM63XX_NUM_EP);
|
|
for (i = 0; i < BCM63XX_NUM_EP; i++)
|
|
bcm63xx_set_stall(udc, &udc->bep[i], false);
|
|
|
|
bcm63xx_set_ctrl_irqs(udc, true);
|
|
bcm63xx_select_pullup(gadget_to_udc(gadget), true);
|
|
rc = 0;
|
|
} else if (!is_on && udc->ep0state != EP0_SHUTDOWN) {
|
|
bcm63xx_select_pullup(gadget_to_udc(gadget), false);
|
|
|
|
udc->ep0_req_shutdown = 1;
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
while (1) {
|
|
schedule_work(&udc->ep0_wq);
|
|
if (udc->ep0state == EP0_SHUTDOWN)
|
|
break;
|
|
msleep(50);
|
|
}
|
|
bcm63xx_set_ctrl_irqs(udc, false);
|
|
cancel_work_sync(&udc->ep0_wq);
|
|
return 0;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_start - Start the controller.
|
|
* @gadget: USB slave device.
|
|
* @driver: Driver for USB slave devices.
|
|
*/
|
|
static int bcm63xx_udc_start(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct bcm63xx_udc *udc = gadget_to_udc(gadget);
|
|
unsigned long flags;
|
|
|
|
if (!driver || driver->max_speed < USB_SPEED_HIGH ||
|
|
!driver->setup)
|
|
return -EINVAL;
|
|
if (!udc)
|
|
return -ENODEV;
|
|
if (udc->driver)
|
|
return -EBUSY;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
|
|
set_clocks(udc, true);
|
|
bcm63xx_fifo_setup(udc);
|
|
bcm63xx_ep_init(udc);
|
|
bcm63xx_ep_setup(udc);
|
|
bcm63xx_fifo_reset(udc);
|
|
bcm63xx_select_phy_mode(udc, true);
|
|
|
|
udc->driver = driver;
|
|
driver->driver.bus = NULL;
|
|
udc->gadget.dev.of_node = udc->dev->of_node;
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_stop - Shut down the controller.
|
|
* @gadget: USB slave device.
|
|
* @driver: Driver for USB slave devices.
|
|
*/
|
|
static int bcm63xx_udc_stop(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct bcm63xx_udc *udc = gadget_to_udc(gadget);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&udc->lock, flags);
|
|
|
|
udc->driver = NULL;
|
|
|
|
/*
|
|
* If we switch the PHY too abruptly after dropping D+, the host
|
|
* will often complain:
|
|
*
|
|
* hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
|
|
*/
|
|
msleep(100);
|
|
|
|
bcm63xx_select_phy_mode(udc, false);
|
|
set_clocks(udc, false);
|
|
|
|
spin_unlock_irqrestore(&udc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct usb_gadget_ops bcm63xx_udc_ops = {
|
|
.get_frame = bcm63xx_udc_get_frame,
|
|
.pullup = bcm63xx_udc_pullup,
|
|
.udc_start = bcm63xx_udc_start,
|
|
.udc_stop = bcm63xx_udc_stop,
|
|
};
|
|
|
|
/***********************************************************************
|
|
* IRQ handling
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_update_cfg_iface - Read current configuration/interface settings.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* This controller intercepts SET_CONFIGURATION and SET_INTERFACE messages.
|
|
* The driver never sees the raw control packets coming in on the ep0
|
|
* IUDMA channel, but at least we get an interrupt event to tell us that
|
|
* new values are waiting in the USBD_STATUS register.
|
|
*/
|
|
static void bcm63xx_update_cfg_iface(struct bcm63xx_udc *udc)
|
|
{
|
|
u32 reg = usbd_readl(udc, USBD_STATUS_REG);
|
|
|
|
udc->cfg = (reg & USBD_STATUS_CFG_MASK) >> USBD_STATUS_CFG_SHIFT;
|
|
udc->iface = (reg & USBD_STATUS_INTF_MASK) >> USBD_STATUS_INTF_SHIFT;
|
|
udc->alt_iface = (reg & USBD_STATUS_ALTINTF_MASK) >>
|
|
USBD_STATUS_ALTINTF_SHIFT;
|
|
bcm63xx_ep_setup(udc);
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_update_link_speed - Check to see if the link speed has changed.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* The link speed update coincides with a SETUP IRQ. Returns 1 if the
|
|
* speed has changed, so that the caller can update the endpoint settings.
|
|
*/
|
|
static int bcm63xx_update_link_speed(struct bcm63xx_udc *udc)
|
|
{
|
|
u32 reg = usbd_readl(udc, USBD_STATUS_REG);
|
|
enum usb_device_speed oldspeed = udc->gadget.speed;
|
|
|
|
switch ((reg & USBD_STATUS_SPD_MASK) >> USBD_STATUS_SPD_SHIFT) {
|
|
case BCM63XX_SPD_HIGH:
|
|
udc->gadget.speed = USB_SPEED_HIGH;
|
|
break;
|
|
case BCM63XX_SPD_FULL:
|
|
udc->gadget.speed = USB_SPEED_FULL;
|
|
break;
|
|
default:
|
|
/* this should never happen */
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
dev_err(udc->dev,
|
|
"received SETUP packet with invalid link speed\n");
|
|
return 0;
|
|
}
|
|
|
|
if (udc->gadget.speed != oldspeed) {
|
|
dev_info(udc->dev, "link up, %s-speed mode\n",
|
|
udc->gadget.speed == USB_SPEED_HIGH ? "high" : "full");
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_update_wedge - Iterate through wedged endpoints.
|
|
* @udc: Reference to the device controller.
|
|
* @new_status: true to "refresh" wedge status; false to clear it.
|
|
*
|
|
* On a SETUP interrupt, we need to manually "refresh" the wedge status
|
|
* because the controller hardware is designed to automatically clear
|
|
* stalls in response to a CLEAR_FEATURE request from the host.
|
|
*
|
|
* On a RESET interrupt, we do want to restore all wedged endpoints.
|
|
*/
|
|
static void bcm63xx_update_wedge(struct bcm63xx_udc *udc, bool new_status)
|
|
{
|
|
int i;
|
|
|
|
for_each_set_bit(i, &udc->wedgemap, BCM63XX_NUM_EP) {
|
|
bcm63xx_set_stall(udc, &udc->bep[i], new_status);
|
|
if (!new_status)
|
|
clear_bit(i, &udc->wedgemap);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_ctrl_isr - ISR for control path events (USBD).
|
|
* @irq: IRQ number (unused).
|
|
* @dev_id: Reference to the device controller.
|
|
*
|
|
* This is where we handle link (VBUS) down, USB reset, speed changes,
|
|
* SET_CONFIGURATION, and SET_INTERFACE events.
|
|
*/
|
|
static irqreturn_t bcm63xx_udc_ctrl_isr(int irq, void *dev_id)
|
|
{
|
|
struct bcm63xx_udc *udc = dev_id;
|
|
u32 stat;
|
|
bool disconnected = false;
|
|
|
|
stat = usbd_readl(udc, USBD_EVENT_IRQ_STATUS_REG) &
|
|
usbd_readl(udc, USBD_EVENT_IRQ_MASK_REG);
|
|
|
|
usbd_writel(udc, stat, USBD_EVENT_IRQ_STATUS_REG);
|
|
|
|
spin_lock(&udc->lock);
|
|
if (stat & BIT(USBD_EVENT_IRQ_USB_LINK)) {
|
|
/* VBUS toggled */
|
|
|
|
if (!(usbd_readl(udc, USBD_EVENTS_REG) &
|
|
USBD_EVENTS_USB_LINK_MASK) &&
|
|
udc->gadget.speed != USB_SPEED_UNKNOWN)
|
|
dev_info(udc->dev, "link down\n");
|
|
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
disconnected = true;
|
|
}
|
|
if (stat & BIT(USBD_EVENT_IRQ_USB_RESET)) {
|
|
bcm63xx_fifo_setup(udc);
|
|
bcm63xx_fifo_reset(udc);
|
|
bcm63xx_ep_setup(udc);
|
|
|
|
bcm63xx_update_wedge(udc, false);
|
|
|
|
udc->ep0_req_reset = 1;
|
|
schedule_work(&udc->ep0_wq);
|
|
disconnected = true;
|
|
}
|
|
if (stat & BIT(USBD_EVENT_IRQ_SETUP)) {
|
|
if (bcm63xx_update_link_speed(udc)) {
|
|
bcm63xx_fifo_setup(udc);
|
|
bcm63xx_ep_setup(udc);
|
|
}
|
|
bcm63xx_update_wedge(udc, true);
|
|
}
|
|
if (stat & BIT(USBD_EVENT_IRQ_SETCFG)) {
|
|
bcm63xx_update_cfg_iface(udc);
|
|
udc->ep0_req_set_cfg = 1;
|
|
schedule_work(&udc->ep0_wq);
|
|
}
|
|
if (stat & BIT(USBD_EVENT_IRQ_SETINTF)) {
|
|
bcm63xx_update_cfg_iface(udc);
|
|
udc->ep0_req_set_iface = 1;
|
|
schedule_work(&udc->ep0_wq);
|
|
}
|
|
spin_unlock(&udc->lock);
|
|
|
|
if (disconnected && udc->driver)
|
|
udc->driver->disconnect(&udc->gadget);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_data_isr - ISR for data path events (IUDMA).
|
|
* @irq: IRQ number (unused).
|
|
* @dev_id: Reference to the IUDMA channel that generated the interrupt.
|
|
*
|
|
* For the two ep0 channels, we have special handling that triggers the
|
|
* ep0 worker thread. For normal bulk/intr channels, either queue up
|
|
* the next buffer descriptor for the transaction (incomplete transaction),
|
|
* or invoke the completion callback (complete transactions).
|
|
*/
|
|
static irqreturn_t bcm63xx_udc_data_isr(int irq, void *dev_id)
|
|
{
|
|
struct iudma_ch *iudma = dev_id;
|
|
struct bcm63xx_udc *udc = iudma->udc;
|
|
struct bcm63xx_ep *bep;
|
|
struct usb_request *req = NULL;
|
|
struct bcm63xx_req *breq = NULL;
|
|
int rc;
|
|
bool is_done = false;
|
|
|
|
spin_lock(&udc->lock);
|
|
|
|
usb_dmac_writel(udc, ENETDMAC_IR_BUFDONE_MASK,
|
|
ENETDMAC_IR_REG(iudma->ch_idx));
|
|
bep = iudma->bep;
|
|
rc = iudma_read(udc, iudma);
|
|
|
|
/* special handling for EP0 RX (0) and TX (1) */
|
|
if (iudma->ch_idx == IUDMA_EP0_RXCHAN ||
|
|
iudma->ch_idx == IUDMA_EP0_TXCHAN) {
|
|
req = udc->ep0_request;
|
|
breq = our_req(req);
|
|
|
|
/* a single request could require multiple submissions */
|
|
if (rc >= 0) {
|
|
req->actual += rc;
|
|
|
|
if (req->actual >= req->length || breq->bd_bytes > rc) {
|
|
udc->ep0_req_completed = 1;
|
|
is_done = true;
|
|
schedule_work(&udc->ep0_wq);
|
|
|
|
/* "actual" on a ZLP is 1 byte */
|
|
req->actual = min(req->actual, req->length);
|
|
} else {
|
|
/* queue up the next BD (same request) */
|
|
iudma_write(udc, iudma, breq);
|
|
}
|
|
}
|
|
} else if (!list_empty(&bep->queue)) {
|
|
breq = list_first_entry(&bep->queue, struct bcm63xx_req, queue);
|
|
req = &breq->req;
|
|
|
|
if (rc >= 0) {
|
|
req->actual += rc;
|
|
|
|
if (req->actual >= req->length || breq->bd_bytes > rc) {
|
|
is_done = true;
|
|
list_del(&breq->queue);
|
|
|
|
req->actual = min(req->actual, req->length);
|
|
|
|
if (!list_empty(&bep->queue)) {
|
|
struct bcm63xx_req *next;
|
|
|
|
next = list_first_entry(&bep->queue,
|
|
struct bcm63xx_req, queue);
|
|
iudma_write(udc, iudma, next);
|
|
}
|
|
} else {
|
|
iudma_write(udc, iudma, breq);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&udc->lock);
|
|
|
|
if (is_done) {
|
|
usb_gadget_unmap_request(&udc->gadget, req, iudma->is_tx);
|
|
if (req->complete)
|
|
req->complete(&bep->ep, req);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Debug filesystem
|
|
***********************************************************************/
|
|
|
|
/*
|
|
* bcm63xx_usbd_dbg_show - Show USBD controller state.
|
|
* @s: seq_file to which the information will be written.
|
|
* @p: Unused.
|
|
*
|
|
* This file nominally shows up as /sys/kernel/debug/bcm63xx_udc/usbd
|
|
*/
|
|
static int bcm63xx_usbd_dbg_show(struct seq_file *s, void *p)
|
|
{
|
|
struct bcm63xx_udc *udc = s->private;
|
|
|
|
if (!udc->driver)
|
|
return -ENODEV;
|
|
|
|
seq_printf(s, "ep0 state: %s\n",
|
|
bcm63xx_ep0_state_names[udc->ep0state]);
|
|
seq_printf(s, " pending requests: %s%s%s%s%s%s%s\n",
|
|
udc->ep0_req_reset ? "reset " : "",
|
|
udc->ep0_req_set_cfg ? "set_cfg " : "",
|
|
udc->ep0_req_set_iface ? "set_iface " : "",
|
|
udc->ep0_req_shutdown ? "shutdown " : "",
|
|
udc->ep0_request ? "pending " : "",
|
|
udc->ep0_req_completed ? "completed " : "",
|
|
udc->ep0_reply ? "reply " : "");
|
|
seq_printf(s, "cfg: %d; iface: %d; alt_iface: %d\n",
|
|
udc->cfg, udc->iface, udc->alt_iface);
|
|
seq_printf(s, "regs:\n");
|
|
seq_printf(s, " control: %08x; straps: %08x; status: %08x\n",
|
|
usbd_readl(udc, USBD_CONTROL_REG),
|
|
usbd_readl(udc, USBD_STRAPS_REG),
|
|
usbd_readl(udc, USBD_STATUS_REG));
|
|
seq_printf(s, " events: %08x; stall: %08x\n",
|
|
usbd_readl(udc, USBD_EVENTS_REG),
|
|
usbd_readl(udc, USBD_STALL_REG));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* bcm63xx_iudma_dbg_show - Show IUDMA status and descriptors.
|
|
* @s: seq_file to which the information will be written.
|
|
* @p: Unused.
|
|
*
|
|
* This file nominally shows up as /sys/kernel/debug/bcm63xx_udc/iudma
|
|
*/
|
|
static int bcm63xx_iudma_dbg_show(struct seq_file *s, void *p)
|
|
{
|
|
struct bcm63xx_udc *udc = s->private;
|
|
int ch_idx, i;
|
|
u32 sram2, sram3;
|
|
|
|
if (!udc->driver)
|
|
return -ENODEV;
|
|
|
|
for (ch_idx = 0; ch_idx < BCM63XX_NUM_IUDMA; ch_idx++) {
|
|
struct iudma_ch *iudma = &udc->iudma[ch_idx];
|
|
struct list_head *pos;
|
|
|
|
seq_printf(s, "IUDMA channel %d -- ", ch_idx);
|
|
switch (iudma_defaults[ch_idx].ep_type) {
|
|
case BCMEP_CTRL:
|
|
seq_printf(s, "control");
|
|
break;
|
|
case BCMEP_BULK:
|
|
seq_printf(s, "bulk");
|
|
break;
|
|
case BCMEP_INTR:
|
|
seq_printf(s, "interrupt");
|
|
break;
|
|
}
|
|
seq_printf(s, ch_idx & 0x01 ? " tx" : " rx");
|
|
seq_printf(s, " [ep%d]:\n",
|
|
max_t(int, iudma_defaults[ch_idx].ep_num, 0));
|
|
seq_printf(s, " cfg: %08x; irqstat: %08x; irqmask: %08x; maxburst: %08x\n",
|
|
usb_dmac_readl(udc, ENETDMAC_CHANCFG_REG(ch_idx)),
|
|
usb_dmac_readl(udc, ENETDMAC_IR_REG(ch_idx)),
|
|
usb_dmac_readl(udc, ENETDMAC_IRMASK_REG(ch_idx)),
|
|
usb_dmac_readl(udc, ENETDMAC_MAXBURST_REG(ch_idx)));
|
|
|
|
sram2 = usb_dmas_readl(udc, ENETDMAS_SRAM2_REG(ch_idx));
|
|
sram3 = usb_dmas_readl(udc, ENETDMAS_SRAM3_REG(ch_idx));
|
|
seq_printf(s, " base: %08x; index: %04x_%04x; desc: %04x_%04x %08x\n",
|
|
usb_dmas_readl(udc, ENETDMAS_RSTART_REG(ch_idx)),
|
|
sram2 >> 16, sram2 & 0xffff,
|
|
sram3 >> 16, sram3 & 0xffff,
|
|
usb_dmas_readl(udc, ENETDMAS_SRAM4_REG(ch_idx)));
|
|
seq_printf(s, " desc: %d/%d used", iudma->n_bds_used,
|
|
iudma->n_bds);
|
|
|
|
if (iudma->bep) {
|
|
i = 0;
|
|
list_for_each(pos, &iudma->bep->queue)
|
|
i++;
|
|
seq_printf(s, "; %d queued\n", i);
|
|
} else {
|
|
seq_printf(s, "\n");
|
|
}
|
|
|
|
for (i = 0; i < iudma->n_bds; i++) {
|
|
struct bcm_enet_desc *d = &iudma->bd_ring[i];
|
|
|
|
seq_printf(s, " %03x (%02x): len_stat: %04x_%04x; pa %08x",
|
|
i * sizeof(*d), i,
|
|
d->len_stat >> 16, d->len_stat & 0xffff,
|
|
d->address);
|
|
if (d == iudma->read_bd)
|
|
seq_printf(s, " <<RD");
|
|
if (d == iudma->write_bd)
|
|
seq_printf(s, " <<WR");
|
|
seq_printf(s, "\n");
|
|
}
|
|
|
|
seq_printf(s, "\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm63xx_usbd_dbg_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, bcm63xx_usbd_dbg_show, inode->i_private);
|
|
}
|
|
|
|
static int bcm63xx_iudma_dbg_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, bcm63xx_iudma_dbg_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations usbd_dbg_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = bcm63xx_usbd_dbg_open,
|
|
.llseek = seq_lseek,
|
|
.read = seq_read,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const struct file_operations iudma_dbg_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = bcm63xx_iudma_dbg_open,
|
|
.llseek = seq_lseek,
|
|
.read = seq_read,
|
|
.release = single_release,
|
|
};
|
|
|
|
|
|
/**
|
|
* bcm63xx_udc_init_debugfs - Create debugfs entries.
|
|
* @udc: Reference to the device controller.
|
|
*/
|
|
static void bcm63xx_udc_init_debugfs(struct bcm63xx_udc *udc)
|
|
{
|
|
struct dentry *root, *usbd, *iudma;
|
|
|
|
if (!IS_ENABLED(CONFIG_USB_GADGET_DEBUG_FS))
|
|
return;
|
|
|
|
root = debugfs_create_dir(udc->gadget.name, NULL);
|
|
if (IS_ERR(root) || !root)
|
|
goto err_root;
|
|
|
|
usbd = debugfs_create_file("usbd", 0400, root, udc,
|
|
&usbd_dbg_fops);
|
|
if (!usbd)
|
|
goto err_usbd;
|
|
iudma = debugfs_create_file("iudma", 0400, root, udc,
|
|
&iudma_dbg_fops);
|
|
if (!iudma)
|
|
goto err_iudma;
|
|
|
|
udc->debugfs_root = root;
|
|
udc->debugfs_usbd = usbd;
|
|
udc->debugfs_iudma = iudma;
|
|
return;
|
|
err_iudma:
|
|
debugfs_remove(usbd);
|
|
err_usbd:
|
|
debugfs_remove(root);
|
|
err_root:
|
|
dev_err(udc->dev, "debugfs is not available\n");
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_cleanup_debugfs - Remove debugfs entries.
|
|
* @udc: Reference to the device controller.
|
|
*
|
|
* debugfs_remove() is safe to call with a NULL argument.
|
|
*/
|
|
static void bcm63xx_udc_cleanup_debugfs(struct bcm63xx_udc *udc)
|
|
{
|
|
debugfs_remove(udc->debugfs_iudma);
|
|
debugfs_remove(udc->debugfs_usbd);
|
|
debugfs_remove(udc->debugfs_root);
|
|
udc->debugfs_iudma = NULL;
|
|
udc->debugfs_usbd = NULL;
|
|
udc->debugfs_root = NULL;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Driver init/exit
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* bcm63xx_udc_probe - Initialize a new instance of the UDC.
|
|
* @pdev: Platform device struct from the bcm63xx BSP code.
|
|
*
|
|
* Note that platform data is required, because pd.port_no varies from chip
|
|
* to chip and is used to switch the correct USB port to device mode.
|
|
*/
|
|
static int bcm63xx_udc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct bcm63xx_usbd_platform_data *pd = dev->platform_data;
|
|
struct bcm63xx_udc *udc;
|
|
struct resource *res;
|
|
int rc = -ENOMEM, i, irq;
|
|
|
|
udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
|
|
if (!udc) {
|
|
dev_err(dev, "cannot allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, udc);
|
|
udc->dev = dev;
|
|
udc->pd = pd;
|
|
|
|
if (!pd) {
|
|
dev_err(dev, "missing platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
udc->usbd_regs = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(udc->usbd_regs))
|
|
return PTR_ERR(udc->usbd_regs);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
udc->iudma_regs = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(udc->iudma_regs))
|
|
return PTR_ERR(udc->iudma_regs);
|
|
|
|
spin_lock_init(&udc->lock);
|
|
INIT_WORK(&udc->ep0_wq, bcm63xx_ep0_process);
|
|
|
|
udc->gadget.ops = &bcm63xx_udc_ops;
|
|
udc->gadget.name = dev_name(dev);
|
|
|
|
if (!pd->use_fullspeed && !use_fullspeed)
|
|
udc->gadget.max_speed = USB_SPEED_HIGH;
|
|
else
|
|
udc->gadget.max_speed = USB_SPEED_FULL;
|
|
|
|
/* request clocks, allocate buffers, and clear any pending IRQs */
|
|
rc = bcm63xx_init_udc_hw(udc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = -ENXIO;
|
|
|
|
/* IRQ resource #0: control interrupt (VBUS, speed, etc.) */
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(dev, "missing IRQ resource #0\n");
|
|
goto out_uninit;
|
|
}
|
|
if (devm_request_irq(dev, irq, &bcm63xx_udc_ctrl_isr, 0,
|
|
dev_name(dev), udc) < 0) {
|
|
dev_err(dev, "error requesting IRQ #%d\n", irq);
|
|
goto out_uninit;
|
|
}
|
|
|
|
/* IRQ resources #1-6: data interrupts for IUDMA channels 0-5 */
|
|
for (i = 0; i < BCM63XX_NUM_IUDMA; i++) {
|
|
irq = platform_get_irq(pdev, i + 1);
|
|
if (irq < 0) {
|
|
dev_err(dev, "missing IRQ resource #%d\n", i + 1);
|
|
goto out_uninit;
|
|
}
|
|
if (devm_request_irq(dev, irq, &bcm63xx_udc_data_isr, 0,
|
|
dev_name(dev), &udc->iudma[i]) < 0) {
|
|
dev_err(dev, "error requesting IRQ #%d\n", irq);
|
|
goto out_uninit;
|
|
}
|
|
}
|
|
|
|
bcm63xx_udc_init_debugfs(udc);
|
|
rc = usb_add_gadget_udc(dev, &udc->gadget);
|
|
if (!rc)
|
|
return 0;
|
|
|
|
bcm63xx_udc_cleanup_debugfs(udc);
|
|
out_uninit:
|
|
bcm63xx_uninit_udc_hw(udc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* bcm63xx_udc_remove - Remove the device from the system.
|
|
* @pdev: Platform device struct from the bcm63xx BSP code.
|
|
*/
|
|
static int bcm63xx_udc_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcm63xx_udc *udc = platform_get_drvdata(pdev);
|
|
|
|
bcm63xx_udc_cleanup_debugfs(udc);
|
|
usb_del_gadget_udc(&udc->gadget);
|
|
BUG_ON(udc->driver);
|
|
|
|
bcm63xx_uninit_udc_hw(udc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver bcm63xx_udc_driver = {
|
|
.probe = bcm63xx_udc_probe,
|
|
.remove = bcm63xx_udc_remove,
|
|
.driver = {
|
|
.name = DRV_MODULE_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
module_platform_driver(bcm63xx_udc_driver);
|
|
|
|
MODULE_DESCRIPTION("BCM63xx USB Peripheral Controller");
|
|
MODULE_AUTHOR("Kevin Cernekee <cernekee@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRV_MODULE_NAME);
|