527 lines
13 KiB
C
527 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for MPC52xx processor BestComm peripheral controller
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*
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* Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2005 Varma Electronics Oy,
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* ( by Andrey Volkov <avolkov@varma-el.com> )
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* Copyright (C) 2003-2004 MontaVista, Software, Inc.
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* ( by Dale Farnsworth <dfarnsworth@mvista.com> )
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mpc52xx.h>
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#include <linux/fsl/bestcomm/sram.h>
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#include <linux/fsl/bestcomm/bestcomm_priv.h>
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#include "linux/fsl/bestcomm/bestcomm.h"
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#define DRIVER_NAME "bestcomm-core"
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/* MPC5200 device tree match tables */
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static const struct of_device_id mpc52xx_sram_ids[] = {
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{ .compatible = "fsl,mpc5200-sram", },
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{ .compatible = "mpc5200-sram", },
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{}
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};
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struct bcom_engine *bcom_eng = NULL;
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EXPORT_SYMBOL_GPL(bcom_eng); /* needed for inline functions */
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/* ======================================================================== */
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/* Public and private API */
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/* ======================================================================== */
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/* Private API */
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struct bcom_task *
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bcom_task_alloc(int bd_count, int bd_size, int priv_size)
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{
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int i, tasknum = -1;
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struct bcom_task *tsk;
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/* Don't try to do anything if bestcomm init failed */
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if (!bcom_eng)
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return NULL;
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/* Get and reserve a task num */
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spin_lock(&bcom_eng->lock);
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for (i=0; i<BCOM_MAX_TASKS; i++)
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if (!bcom_eng->tdt[i].stop) { /* we use stop as a marker */
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bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
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tasknum = i;
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break;
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}
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spin_unlock(&bcom_eng->lock);
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if (tasknum < 0)
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return NULL;
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/* Allocate our structure */
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tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
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if (!tsk)
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goto error;
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tsk->tasknum = tasknum;
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if (priv_size)
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tsk->priv = (void*)tsk + sizeof(struct bcom_task);
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/* Get IRQ of that task */
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tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
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if (!tsk->irq)
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goto error;
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/* Init the BDs, if needed */
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if (bd_count) {
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tsk->cookie = kmalloc_array(bd_count, sizeof(void *),
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GFP_KERNEL);
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if (!tsk->cookie)
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goto error;
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tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
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if (!tsk->bd)
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goto error;
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memset_io(tsk->bd, 0x00, bd_count * bd_size);
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tsk->num_bd = bd_count;
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tsk->bd_size = bd_size;
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}
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return tsk;
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error:
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if (tsk) {
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if (tsk->irq)
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irq_dispose_mapping(tsk->irq);
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bcom_sram_free(tsk->bd);
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kfree(tsk->cookie);
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kfree(tsk);
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}
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bcom_eng->tdt[tasknum].stop = 0;
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return NULL;
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}
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EXPORT_SYMBOL_GPL(bcom_task_alloc);
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void
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bcom_task_free(struct bcom_task *tsk)
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{
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/* Stop the task */
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bcom_disable_task(tsk->tasknum);
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/* Clear TDT */
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bcom_eng->tdt[tsk->tasknum].start = 0;
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bcom_eng->tdt[tsk->tasknum].stop = 0;
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/* Free everything */
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irq_dispose_mapping(tsk->irq);
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bcom_sram_free(tsk->bd);
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kfree(tsk->cookie);
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kfree(tsk);
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}
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EXPORT_SYMBOL_GPL(bcom_task_free);
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int
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bcom_load_image(int task, u32 *task_image)
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{
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struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
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struct bcom_tdt *tdt;
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u32 *desc, *var, *inc;
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u32 *desc_src, *var_src, *inc_src;
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/* Safety checks */
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if (hdr->magic != BCOM_TASK_MAGIC) {
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printk(KERN_ERR DRIVER_NAME
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": Trying to load invalid microcode\n");
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return -EINVAL;
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}
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if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
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printk(KERN_ERR DRIVER_NAME
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": Trying to load invalid task %d\n", task);
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return -EINVAL;
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}
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/* Initial load or reload */
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tdt = &bcom_eng->tdt[task];
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if (tdt->start) {
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desc = bcom_task_desc(task);
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if (hdr->desc_size != bcom_task_num_descs(task)) {
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printk(KERN_ERR DRIVER_NAME
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": Trying to reload wrong task image "
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"(%d size %d/%d)!\n",
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task,
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hdr->desc_size,
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bcom_task_num_descs(task));
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return -EINVAL;
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}
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} else {
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phys_addr_t start_pa;
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desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
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if (!desc)
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return -ENOMEM;
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tdt->start = start_pa;
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tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
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}
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var = bcom_task_var(task);
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inc = bcom_task_inc(task);
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/* Clear & copy */
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memset_io(var, 0x00, BCOM_VAR_SIZE);
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memset_io(inc, 0x00, BCOM_INC_SIZE);
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desc_src = (u32 *)(hdr + 1);
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var_src = desc_src + hdr->desc_size;
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inc_src = var_src + hdr->var_size;
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memcpy_toio(desc, desc_src, hdr->desc_size * sizeof(u32));
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memcpy_toio(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
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memcpy_toio(inc, inc_src, hdr->inc_size * sizeof(u32));
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return 0;
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}
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EXPORT_SYMBOL_GPL(bcom_load_image);
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void
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bcom_set_initiator(int task, int initiator)
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{
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int i;
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int num_descs;
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u32 *desc;
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int next_drd_has_initiator;
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bcom_set_tcr_initiator(task, initiator);
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/* Just setting tcr is apparently not enough due to some problem */
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/* with it. So we just go thru all the microcode and replace in */
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/* the DRD directly */
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desc = bcom_task_desc(task);
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next_drd_has_initiator = 1;
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num_descs = bcom_task_num_descs(task);
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for (i=0; i<num_descs; i++, desc++) {
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if (!bcom_desc_is_drd(*desc))
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continue;
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if (next_drd_has_initiator)
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if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
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bcom_set_desc_initiator(desc, initiator);
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next_drd_has_initiator = !bcom_drd_is_extended(*desc);
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}
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}
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EXPORT_SYMBOL_GPL(bcom_set_initiator);
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/* Public API */
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void
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bcom_enable(struct bcom_task *tsk)
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{
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bcom_enable_task(tsk->tasknum);
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}
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EXPORT_SYMBOL_GPL(bcom_enable);
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void
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bcom_disable(struct bcom_task *tsk)
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{
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bcom_disable_task(tsk->tasknum);
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}
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EXPORT_SYMBOL_GPL(bcom_disable);
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/* ======================================================================== */
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/* Engine init/cleanup */
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/* ======================================================================== */
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/* Function Descriptor table */
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/* this will need to be updated if Freescale changes their task code FDT */
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static u32 fdt_ops[] = {
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0xa0045670, /* FDT[48] - load_acc() */
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0x80045670, /* FDT[49] - unload_acc() */
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0x21800000, /* FDT[50] - and() */
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0x21e00000, /* FDT[51] - or() */
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0x21500000, /* FDT[52] - xor() */
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0x21400000, /* FDT[53] - andn() */
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0x21500000, /* FDT[54] - not() */
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0x20400000, /* FDT[55] - add() */
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0x20500000, /* FDT[56] - sub() */
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0x20800000, /* FDT[57] - lsh() */
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0x20a00000, /* FDT[58] - rsh() */
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0xc0170000, /* FDT[59] - crc8() */
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0xc0145670, /* FDT[60] - crc16() */
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0xc0345670, /* FDT[61] - crc32() */
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0xa0076540, /* FDT[62] - endian32() */
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0xa0000760, /* FDT[63] - endian16() */
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};
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static int bcom_engine_init(void)
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{
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int task;
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phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
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unsigned int tdt_size, ctx_size, var_size, fdt_size;
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/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
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tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
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ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
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var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
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fdt_size = BCOM_FDT_SIZE;
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bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
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bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
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bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
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bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);
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if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
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printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");
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bcom_sram_free(bcom_eng->tdt);
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bcom_sram_free(bcom_eng->ctx);
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bcom_sram_free(bcom_eng->var);
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bcom_sram_free(bcom_eng->fdt);
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return -ENOMEM;
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}
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memset_io(bcom_eng->tdt, 0x00, tdt_size);
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memset_io(bcom_eng->ctx, 0x00, ctx_size);
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memset_io(bcom_eng->var, 0x00, var_size);
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memset_io(bcom_eng->fdt, 0x00, fdt_size);
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/* Copy the FDT for the EU#3 */
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memcpy_toio(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));
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/* Initialize Task base structure */
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for (task=0; task<BCOM_MAX_TASKS; task++)
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{
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out_be16(&bcom_eng->regs->tcr[task], 0);
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out_8(&bcom_eng->regs->ipr[task], 0);
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bcom_eng->tdt[task].context = ctx_pa;
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bcom_eng->tdt[task].var = var_pa;
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bcom_eng->tdt[task].fdt = fdt_pa;
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var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
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ctx_pa += BCOM_CTX_SIZE;
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}
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out_be32(&bcom_eng->regs->taskBar, tdt_pa);
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/* Init 'always' initiator */
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out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
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/* Disable COMM Bus Prefetch on the original 5200; it's broken */
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if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
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bcom_disable_prefetch();
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/* Init lock */
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spin_lock_init(&bcom_eng->lock);
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return 0;
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}
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static void
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bcom_engine_cleanup(void)
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{
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int task;
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/* Stop all tasks */
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for (task=0; task<BCOM_MAX_TASKS; task++)
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{
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out_be16(&bcom_eng->regs->tcr[task], 0);
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out_8(&bcom_eng->regs->ipr[task], 0);
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}
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out_be32(&bcom_eng->regs->taskBar, 0ul);
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/* Release the SRAM zones */
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bcom_sram_free(bcom_eng->tdt);
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bcom_sram_free(bcom_eng->ctx);
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bcom_sram_free(bcom_eng->var);
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bcom_sram_free(bcom_eng->fdt);
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}
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/* ======================================================================== */
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/* OF platform driver */
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/* ======================================================================== */
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static int mpc52xx_bcom_probe(struct platform_device *op)
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{
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struct device_node *ofn_sram;
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struct resource res_bcom;
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int rv;
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/* Inform user we're ok so far */
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printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
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/* Get the bestcomm node */
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of_node_get(op->dev.of_node);
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/* Prepare SRAM */
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ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
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if (!ofn_sram) {
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printk(KERN_ERR DRIVER_NAME ": "
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"No SRAM found in device tree\n");
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rv = -ENODEV;
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goto error_ofput;
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}
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rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
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of_node_put(ofn_sram);
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if (rv) {
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printk(KERN_ERR DRIVER_NAME ": "
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"Error in SRAM init\n");
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goto error_ofput;
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}
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/* Get a clean struct */
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bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
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if (!bcom_eng) {
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rv = -ENOMEM;
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goto error_sramclean;
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}
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/* Save the node */
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bcom_eng->ofnode = op->dev.of_node;
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/* Get, reserve & map io */
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if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
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printk(KERN_ERR DRIVER_NAME ": "
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"Can't get resource\n");
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rv = -EINVAL;
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goto error_sramclean;
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}
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if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
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DRIVER_NAME)) {
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printk(KERN_ERR DRIVER_NAME ": "
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"Can't request registers region\n");
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rv = -EBUSY;
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goto error_sramclean;
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}
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bcom_eng->regs_base = res_bcom.start;
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bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
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if (!bcom_eng->regs) {
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printk(KERN_ERR DRIVER_NAME ": "
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"Can't map registers\n");
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rv = -ENOMEM;
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goto error_release;
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}
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/* Now, do the real init */
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rv = bcom_engine_init();
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if (rv)
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goto error_unmap;
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/* Done ! */
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printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
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(long)bcom_eng->regs_base);
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return 0;
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/* Error path */
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error_unmap:
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iounmap(bcom_eng->regs);
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error_release:
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release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
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error_sramclean:
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kfree(bcom_eng);
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bcom_sram_cleanup();
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error_ofput:
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of_node_put(op->dev.of_node);
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printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");
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return rv;
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}
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static int mpc52xx_bcom_remove(struct platform_device *op)
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{
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/* Clean up the engine */
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bcom_engine_cleanup();
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/* Cleanup SRAM */
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bcom_sram_cleanup();
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/* Release regs */
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iounmap(bcom_eng->regs);
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release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
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/* Release the node */
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of_node_put(bcom_eng->ofnode);
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/* Release memory */
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kfree(bcom_eng);
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bcom_eng = NULL;
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return 0;
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}
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static const struct of_device_id mpc52xx_bcom_of_match[] = {
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{ .compatible = "fsl,mpc5200-bestcomm", },
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{ .compatible = "mpc5200-bestcomm", },
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{},
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};
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MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);
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static struct platform_driver mpc52xx_bcom_of_platform_driver = {
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.probe = mpc52xx_bcom_probe,
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.remove = mpc52xx_bcom_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = mpc52xx_bcom_of_match,
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},
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};
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/* ======================================================================== */
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/* Module */
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/* ======================================================================== */
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static int __init
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mpc52xx_bcom_init(void)
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{
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return platform_driver_register(&mpc52xx_bcom_of_platform_driver);
|
|
}
|
|
|
|
static void __exit
|
|
mpc52xx_bcom_exit(void)
|
|
{
|
|
platform_driver_unregister(&mpc52xx_bcom_of_platform_driver);
|
|
}
|
|
|
|
/* If we're not a module, we must make sure everything is setup before */
|
|
/* anyone tries to use us ... that's why we use subsys_initcall instead */
|
|
/* of module_init. */
|
|
subsys_initcall(mpc52xx_bcom_init);
|
|
module_exit(mpc52xx_bcom_exit);
|
|
|
|
MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
|
|
MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
|
|
MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
|
|
MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
|
|
MODULE_LICENSE("GPL v2");
|