510 lines
13 KiB
C
510 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, MediaTek Inc.
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* Copyright (c) 2021-2022, Intel Corporation.
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*
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* Authors:
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* Amir Hanania <amir.hanania@intel.com>
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* Haijun Liu <haijun.liu@mediatek.com>
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* Moises Veleta <moises.veleta@intel.com>
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* Ricardo Martinez <ricardo.martinez@linux.intel.com>
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*
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* Contributors:
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* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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* Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
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* Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
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* Eliot Lee <eliot.lee@intel.com>
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* Sreehari Kancharla <sreehari.kancharla@intel.com>
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*/
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#include <linux/bits.h>
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/wwan.h>
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#include "t7xx_hif_cldma.h"
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#include "t7xx_modem_ops.h"
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#include "t7xx_port.h"
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#include "t7xx_port_proxy.h"
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#include "t7xx_state_monitor.h"
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#define Q_IDX_CTRL 0
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#define Q_IDX_MBIM 2
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#define Q_IDX_AT_CMD 5
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#define INVALID_SEQ_NUM GENMASK(15, 0)
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#define for_each_proxy_port(i, p, proxy) \
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for (i = 0, (p) = &(proxy)->ports[i]; \
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i < (proxy)->port_count; \
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i++, (p) = &(proxy)->ports[i])
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static const struct t7xx_port_conf t7xx_md_port_conf[] = {
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{
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.tx_ch = PORT_CH_UART2_TX,
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.rx_ch = PORT_CH_UART2_RX,
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.txq_index = Q_IDX_AT_CMD,
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.rxq_index = Q_IDX_AT_CMD,
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.txq_exp_index = 0xff,
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.rxq_exp_index = 0xff,
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.path_id = CLDMA_ID_MD,
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.ops = &wwan_sub_port_ops,
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.name = "AT",
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.port_type = WWAN_PORT_AT,
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}, {
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.tx_ch = PORT_CH_MBIM_TX,
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.rx_ch = PORT_CH_MBIM_RX,
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.txq_index = Q_IDX_MBIM,
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.rxq_index = Q_IDX_MBIM,
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.path_id = CLDMA_ID_MD,
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.ops = &wwan_sub_port_ops,
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.name = "MBIM",
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.port_type = WWAN_PORT_MBIM,
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}, {
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.tx_ch = PORT_CH_CONTROL_TX,
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.rx_ch = PORT_CH_CONTROL_RX,
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.txq_index = Q_IDX_CTRL,
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.rxq_index = Q_IDX_CTRL,
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.path_id = CLDMA_ID_MD,
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.ops = &ctl_port_ops,
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.name = "t7xx_ctrl",
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},
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};
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static struct t7xx_port *t7xx_proxy_get_port_by_ch(struct port_proxy *port_prox, enum port_ch ch)
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{
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const struct t7xx_port_conf *port_conf;
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struct t7xx_port *port;
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int i;
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for_each_proxy_port(i, port, port_prox) {
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port_conf = port->port_conf;
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if (port_conf->rx_ch == ch || port_conf->tx_ch == ch)
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return port;
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}
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return NULL;
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}
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static u16 t7xx_port_next_rx_seq_num(struct t7xx_port *port, struct ccci_header *ccci_h)
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{
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u32 status = le32_to_cpu(ccci_h->status);
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u16 seq_num, next_seq_num;
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bool assert_bit;
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seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status);
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next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD);
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assert_bit = status & CCCI_H_AST_BIT;
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if (!assert_bit || port->seq_nums[MTK_RX] == INVALID_SEQ_NUM)
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return next_seq_num;
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if (seq_num != port->seq_nums[MTK_RX])
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dev_warn_ratelimited(port->dev,
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"seq num out-of-order %u != %u (header %X, len %X)\n",
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seq_num, port->seq_nums[MTK_RX],
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le32_to_cpu(ccci_h->packet_header),
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le32_to_cpu(ccci_h->packet_len));
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return next_seq_num;
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}
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void t7xx_port_proxy_reset(struct port_proxy *port_prox)
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{
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struct t7xx_port *port;
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int i;
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for_each_proxy_port(i, port, port_prox) {
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port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
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port->seq_nums[MTK_TX] = 0;
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}
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}
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static int t7xx_port_get_queue_no(struct t7xx_port *port)
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{
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const struct t7xx_port_conf *port_conf = port->port_conf;
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struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
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return t7xx_fsm_get_md_state(ctl) == MD_STATE_EXCEPTION ?
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port_conf->txq_exp_index : port_conf->txq_index;
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}
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static void t7xx_port_struct_init(struct t7xx_port *port)
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{
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INIT_LIST_HEAD(&port->entry);
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INIT_LIST_HEAD(&port->queue_entry);
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skb_queue_head_init(&port->rx_skb_list);
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init_waitqueue_head(&port->rx_wq);
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port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
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port->seq_nums[MTK_TX] = 0;
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atomic_set(&port->usage_cnt, 0);
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}
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struct sk_buff *t7xx_port_alloc_skb(int payload)
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{
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struct sk_buff *skb = __dev_alloc_skb(payload + sizeof(struct ccci_header), GFP_KERNEL);
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if (skb)
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skb_reserve(skb, sizeof(struct ccci_header));
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return skb;
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}
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struct sk_buff *t7xx_ctrl_alloc_skb(int payload)
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{
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struct sk_buff *skb = t7xx_port_alloc_skb(payload + sizeof(struct ctrl_msg_header));
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if (skb)
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skb_reserve(skb, sizeof(struct ctrl_msg_header));
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return skb;
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}
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/**
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* t7xx_port_enqueue_skb() - Enqueue the received skb into the port's rx_skb_list.
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* @port: port context.
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* @skb: received skb.
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*
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* Return:
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* * 0 - Success.
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* * -ENOBUFS - Not enough buffer space. Caller will try again later, skb is not consumed.
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*/
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int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb)
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{
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unsigned long flags;
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spin_lock_irqsave(&port->rx_wq.lock, flags);
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if (port->rx_skb_list.qlen >= port->rx_length_th) {
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spin_unlock_irqrestore(&port->rx_wq.lock, flags);
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return -ENOBUFS;
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}
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__skb_queue_tail(&port->rx_skb_list, skb);
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spin_unlock_irqrestore(&port->rx_wq.lock, flags);
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wake_up_all(&port->rx_wq);
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return 0;
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}
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static int t7xx_port_send_raw_skb(struct t7xx_port *port, struct sk_buff *skb)
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{
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enum cldma_id path_id = port->port_conf->path_id;
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struct cldma_ctrl *md_ctrl;
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int ret, tx_qno;
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md_ctrl = port->t7xx_dev->md->md_ctrl[path_id];
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tx_qno = t7xx_port_get_queue_no(port);
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ret = t7xx_cldma_send_skb(md_ctrl, tx_qno, skb);
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if (ret)
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dev_err(port->dev, "Failed to send skb: %d\n", ret);
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return ret;
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}
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static int t7xx_port_send_ccci_skb(struct t7xx_port *port, struct sk_buff *skb,
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unsigned int pkt_header, unsigned int ex_msg)
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{
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const struct t7xx_port_conf *port_conf = port->port_conf;
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struct ccci_header *ccci_h;
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u32 status;
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int ret;
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ccci_h = skb_push(skb, sizeof(*ccci_h));
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status = FIELD_PREP(CCCI_H_CHN_FLD, port_conf->tx_ch) |
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FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT;
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ccci_h->status = cpu_to_le32(status);
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ccci_h->packet_header = cpu_to_le32(pkt_header);
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ccci_h->packet_len = cpu_to_le32(skb->len);
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ccci_h->ex_msg = cpu_to_le32(ex_msg);
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ret = t7xx_port_send_raw_skb(port, skb);
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if (ret)
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return ret;
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port->seq_nums[MTK_TX]++;
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return 0;
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}
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int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg,
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unsigned int ex_msg)
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{
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struct ctrl_msg_header *ctrl_msg_h;
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unsigned int msg_len = skb->len;
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u32 pkt_header = 0;
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ctrl_msg_h = skb_push(skb, sizeof(*ctrl_msg_h));
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ctrl_msg_h->ctrl_msg_id = cpu_to_le32(msg);
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ctrl_msg_h->ex_msg = cpu_to_le32(ex_msg);
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ctrl_msg_h->data_length = cpu_to_le32(msg_len);
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if (!msg_len)
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pkt_header = CCCI_HEADER_NO_DATA;
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return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
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}
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int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
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unsigned int ex_msg)
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{
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struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
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unsigned int fsm_state;
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fsm_state = t7xx_fsm_get_ctl_state(ctl);
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if (fsm_state != FSM_STATE_PRE_START) {
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const struct t7xx_port_conf *port_conf = port->port_conf;
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enum md_state md_state = t7xx_fsm_get_md_state(ctl);
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switch (md_state) {
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case MD_STATE_EXCEPTION:
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if (port_conf->tx_ch != PORT_CH_MD_LOG_TX)
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return -EBUSY;
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break;
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case MD_STATE_WAITING_FOR_HS1:
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case MD_STATE_WAITING_FOR_HS2:
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case MD_STATE_STOPPED:
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case MD_STATE_WAITING_TO_STOP:
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case MD_STATE_INVALID:
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return -ENODEV;
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default:
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break;
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}
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}
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return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
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}
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static void t7xx_proxy_setup_ch_mapping(struct port_proxy *port_prox)
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{
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struct t7xx_port *port;
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int i, j;
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for (i = 0; i < ARRAY_SIZE(port_prox->rx_ch_ports); i++)
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INIT_LIST_HEAD(&port_prox->rx_ch_ports[i]);
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for (j = 0; j < ARRAY_SIZE(port_prox->queue_ports); j++) {
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for (i = 0; i < ARRAY_SIZE(port_prox->queue_ports[j]); i++)
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INIT_LIST_HEAD(&port_prox->queue_ports[j][i]);
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}
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for_each_proxy_port(i, port, port_prox) {
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const struct t7xx_port_conf *port_conf = port->port_conf;
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enum cldma_id path_id = port_conf->path_id;
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u8 ch_id;
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ch_id = FIELD_GET(PORT_CH_ID_MASK, port_conf->rx_ch);
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list_add_tail(&port->entry, &port_prox->rx_ch_ports[ch_id]);
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list_add_tail(&port->queue_entry,
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&port_prox->queue_ports[path_id][port_conf->rxq_index]);
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}
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}
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static struct t7xx_port *t7xx_port_proxy_find_port(struct t7xx_pci_dev *t7xx_dev,
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struct cldma_queue *queue, u16 channel)
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{
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struct port_proxy *port_prox = t7xx_dev->md->port_prox;
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struct list_head *port_list;
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struct t7xx_port *port;
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u8 ch_id;
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ch_id = FIELD_GET(PORT_CH_ID_MASK, channel);
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port_list = &port_prox->rx_ch_ports[ch_id];
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list_for_each_entry(port, port_list, entry) {
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const struct t7xx_port_conf *port_conf = port->port_conf;
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if (queue->md_ctrl->hif_id == port_conf->path_id &&
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channel == port_conf->rx_ch)
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return port;
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}
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return NULL;
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}
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/**
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* t7xx_port_proxy_recv_skb() - Dispatch received skb.
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* @queue: CLDMA queue.
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* @skb: Socket buffer.
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*
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* Return:
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** 0 - Packet consumed.
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** -ERROR - Failed to process skb.
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*/
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static int t7xx_port_proxy_recv_skb(struct cldma_queue *queue, struct sk_buff *skb)
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{
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struct ccci_header *ccci_h = (struct ccci_header *)skb->data;
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struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev;
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struct t7xx_fsm_ctl *ctl = t7xx_dev->md->fsm_ctl;
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struct device *dev = queue->md_ctrl->dev;
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const struct t7xx_port_conf *port_conf;
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struct t7xx_port *port;
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u16 seq_num, channel;
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int ret;
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channel = FIELD_GET(CCCI_H_CHN_FLD, le32_to_cpu(ccci_h->status));
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if (t7xx_fsm_get_md_state(ctl) == MD_STATE_INVALID) {
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dev_err_ratelimited(dev, "Packet drop on channel 0x%x, modem not ready\n", channel);
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goto drop_skb;
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}
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port = t7xx_port_proxy_find_port(t7xx_dev, queue, channel);
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if (!port) {
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dev_err_ratelimited(dev, "Packet drop on channel 0x%x, port not found\n", channel);
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goto drop_skb;
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}
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seq_num = t7xx_port_next_rx_seq_num(port, ccci_h);
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port_conf = port->port_conf;
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skb_pull(skb, sizeof(*ccci_h));
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ret = port_conf->ops->recv_skb(port, skb);
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/* Error indicates to try again later */
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if (ret) {
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skb_push(skb, sizeof(*ccci_h));
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return ret;
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}
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port->seq_nums[MTK_RX] = seq_num;
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return 0;
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drop_skb:
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dev_kfree_skb_any(skb);
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return 0;
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}
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/**
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* t7xx_port_proxy_md_status_notify() - Notify all ports of state.
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*@port_prox: The port_proxy pointer.
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*@state: State.
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*
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* Called by t7xx_fsm. Used to dispatch modem status for all ports,
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* which want to know MD state transition.
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*/
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void t7xx_port_proxy_md_status_notify(struct port_proxy *port_prox, unsigned int state)
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{
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struct t7xx_port *port;
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int i;
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for_each_proxy_port(i, port, port_prox) {
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const struct t7xx_port_conf *port_conf = port->port_conf;
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if (port_conf->ops->md_state_notify)
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port_conf->ops->md_state_notify(port, state);
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}
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}
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static void t7xx_proxy_init_all_ports(struct t7xx_modem *md)
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{
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struct port_proxy *port_prox = md->port_prox;
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struct t7xx_port *port;
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int i;
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for_each_proxy_port(i, port, port_prox) {
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const struct t7xx_port_conf *port_conf = port->port_conf;
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t7xx_port_struct_init(port);
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if (port_conf->tx_ch == PORT_CH_CONTROL_TX)
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md->core_md.ctl_port = port;
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port->t7xx_dev = md->t7xx_dev;
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port->dev = &md->t7xx_dev->pdev->dev;
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spin_lock_init(&port->port_update_lock);
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port->chan_enable = false;
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if (port_conf->ops->init)
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port_conf->ops->init(port);
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}
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t7xx_proxy_setup_ch_mapping(port_prox);
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}
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static int t7xx_proxy_alloc(struct t7xx_modem *md)
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{
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unsigned int port_count = ARRAY_SIZE(t7xx_md_port_conf);
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struct device *dev = &md->t7xx_dev->pdev->dev;
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struct port_proxy *port_prox;
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int i;
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port_prox = devm_kzalloc(dev, sizeof(*port_prox) + sizeof(struct t7xx_port) * port_count,
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GFP_KERNEL);
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if (!port_prox)
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return -ENOMEM;
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md->port_prox = port_prox;
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port_prox->dev = dev;
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for (i = 0; i < port_count; i++)
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port_prox->ports[i].port_conf = &t7xx_md_port_conf[i];
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port_prox->port_count = port_count;
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t7xx_proxy_init_all_ports(md);
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return 0;
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}
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/**
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* t7xx_port_proxy_init() - Initialize ports.
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* @md: Modem.
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*
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* Create all port instances.
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*
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* Return:
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* * 0 - Success.
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* * -ERROR - Error code from failure sub-initializations.
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*/
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int t7xx_port_proxy_init(struct t7xx_modem *md)
|
|
{
|
|
int ret;
|
|
|
|
ret = t7xx_proxy_alloc(md);
|
|
if (ret)
|
|
return ret;
|
|
|
|
t7xx_cldma_set_recv_skb(md->md_ctrl[CLDMA_ID_MD], t7xx_port_proxy_recv_skb);
|
|
return 0;
|
|
}
|
|
|
|
void t7xx_port_proxy_uninit(struct port_proxy *port_prox)
|
|
{
|
|
struct t7xx_port *port;
|
|
int i;
|
|
|
|
for_each_proxy_port(i, port, port_prox) {
|
|
const struct t7xx_port_conf *port_conf = port->port_conf;
|
|
|
|
if (port_conf->ops->uninit)
|
|
port_conf->ops->uninit(port);
|
|
}
|
|
}
|
|
|
|
int t7xx_port_proxy_chl_enable_disable(struct port_proxy *port_prox, unsigned int ch_id,
|
|
bool en_flag)
|
|
{
|
|
struct t7xx_port *port = t7xx_proxy_get_port_by_ch(port_prox, ch_id);
|
|
const struct t7xx_port_conf *port_conf;
|
|
|
|
if (!port)
|
|
return -EINVAL;
|
|
|
|
port_conf = port->port_conf;
|
|
|
|
if (en_flag) {
|
|
if (port_conf->ops->enable_chl)
|
|
port_conf->ops->enable_chl(port);
|
|
} else {
|
|
if (port_conf->ops->disable_chl)
|
|
port_conf->ops->disable_chl(port);
|
|
}
|
|
|
|
return 0;
|
|
}
|