// SPDX-License-Identifier: GPL-2.0-only
/*
* ST's Remote Processor Control Driver
*
* Copyright (C) 2015 STMicroelectronics - All Rights Reserved
*
* Author: Ludovic Barre <[email protected]>
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/remoteproc.h>
#include <linux/reset.h>
#include "remoteproc_internal.h"
#define ST_RPROC_VQ0 0
#define ST_RPROC_VQ1 1
#define ST_RPROC_MAX_VRING 2
#define MBOX_RX 0
#define MBOX_TX 1
#define MBOX_MAX 2
struct st_rproc_config {
bool sw_reset;
bool pwr_reset;
unsigned long bootaddr_mask;
};
struct st_rproc {
struct st_rproc_config *config;
struct reset_control *sw_reset;
struct reset_control *pwr_reset;
struct clk *clk;
u32 clk_rate;
struct regmap *boot_base;
u32 boot_offset;
struct mbox_chan *mbox_chan[ST_RPROC_MAX_VRING * MBOX_MAX];
struct mbox_client mbox_client_vq0;
struct mbox_client mbox_client_vq1;
};
static void st_rproc_mbox_callback(struct device *dev, u32 msg)
{
struct rproc *rproc = dev_get_drvdata(dev);
if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
dev_dbg(dev, "no message was found in vqid %d\n", msg);
}
static
void st_rproc_mbox_callback_vq0(struct mbox_client *mbox_client, void *data)
{
st_rproc_mbox_callback(mbox_client->dev, 0);
}
static
void st_rproc_mbox_callback_vq1(struct mbox_client *mbox_client, void *data)
{
st_rproc_mbox_callback(mbox_client->dev, 1);
}
static void st_rproc_kick(struct rproc *rproc, int vqid)
{
struct st_rproc *ddata = rproc->priv;
struct device *dev = rproc->dev.parent;
int ret;
/* send the index of the triggered virtqueue in the mailbox payload */
if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
return;
ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
(void *)&vqid);
if (ret < 0)
dev_err(dev, "failed to send message via mbox: %d\n", ret);
}
static int st_rproc_mem_alloc(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
struct device *dev = rproc->dev.parent;
void *va;
va = ioremap_wc(mem->dma, mem->len);
if (!va) {
dev_err(dev, "Unable to map memory region: %pa+%zx\n",
&mem->dma, mem->len);
return -ENOMEM;
}
/* Update memory entry va */
mem->va = va;
return 0;
}
static int st_rproc_mem_release(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
iounmap(mem->va);
return 0;
}
static int st_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = rproc->dev.parent;
struct device_node *np = dev->of_node;
struct rproc_mem_entry *mem;
struct reserved_mem *rmem;
struct of_phandle_iterator it;
int index = 0;
of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
while (of_phandle_iterator_next(&it) == 0) {
rmem = of_reserved_mem_lookup(it.node);
if (!rmem) {
of_node_put(it.node);
dev_err(dev, "unable to acquire memory-region\n");
return -EINVAL;
}
/* No need to map vdev buffer */
if (strcmp(it.node->name, "vdev0buffer")) {
/* Register memory region */
mem = rproc_mem_entry_init(dev, NULL,
(dma_addr_t)rmem->base,
rmem->size, rmem->base,
st_rproc_mem_alloc,
st_rproc_mem_release,
it.node->name);
} else {
/* Register reserved memory for vdev buffer allocation */
mem = rproc_of_resm_mem_entry_init(dev, index,
rmem->size,
rmem->base,
it.node->name);
}
if (!mem) {
of_node_put(it.node);
return -ENOMEM;
}
rproc_add_carveout(rproc, mem);
index++;
}
return rproc_elf_load_rsc_table(rproc, fw);
}
static int st_rproc_start(struct rproc *rproc)
{
struct st_rproc *ddata = rproc->priv;
int err;
regmap_update_bits(ddata->boot_base, ddata->boot_offset,
ddata->config->bootaddr_mask, rproc->bootaddr);
err = clk_enable(ddata->clk);
if (err) {
dev_err(&rproc->dev, "Failed to enable clock\n");
return err;
}
if (ddata->config->sw_reset) {
err = reset_control_deassert(ddata->sw_reset);
if (err) {
dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
goto sw_reset_fail;
}
}
if (ddata->config->pwr_reset) {
err = reset_control_deassert(ddata->pwr_reset);
if (err) {
dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
goto pwr_reset_fail;
}
}
dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr);
return 0;
pwr_reset_fail:
if (ddata->config->pwr_reset)
reset_control_assert(ddata->sw_reset);
sw_reset_fail:
clk_disable(ddata->clk);
return err;
}
static int st_rproc_stop(struct rproc *rproc)
{
struct st_rproc *ddata = rproc->priv;
int sw_err = 0, pwr_err = 0;
if (ddata->config->sw_reset) {
sw_err = reset_control_assert(ddata->sw_reset);
if (sw_err)
dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
}
if (ddata->config->pwr_reset) {
pwr_err = reset_control_assert(ddata->pwr_reset);
if (pwr_err)
dev_err(&rproc->dev, "Failed to assert Power Reset\n");
}
clk_disable(ddata->clk);
return sw_err ?: pwr_err;
}
static const struct rproc_ops st_rproc_ops = {
.kick = st_rproc_kick,
.start = st_rproc_start,
.stop = st_rproc_stop,
.parse_fw = st_rproc_parse_fw,
.load = rproc_elf_load_segments,
.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
.sanity_check = rproc_elf_sanity_check,
.get_boot_addr = rproc_elf_get_boot_addr,
};
/*
* Fetch state of the processor: 0 is off, 1 is on.
*/
static int st_rproc_state(struct platform_device *pdev)
{
struct rproc *rproc = platform_get_drvdata(pdev);
struct st_rproc *ddata = rproc->priv;
int reset_sw = 0, reset_pwr = 0;
if (ddata->config->sw_reset)
reset_sw = reset_control_status(ddata->sw_reset);
if (ddata->config->pwr_reset)
reset_pwr = reset_control_status(ddata->pwr_reset);
if (reset_sw < 0 || reset_pwr < 0)
return -EINVAL;
return !reset_sw && !reset_pwr;
}
static const struct st_rproc_config st40_rproc_cfg = {
.sw_reset = true,
.pwr_reset = true,
.bootaddr_mask = GENMASK(28, 1),
};
static const struct st_rproc_config st231_rproc_cfg = {
.sw_reset = true,
.pwr_reset = false,
.bootaddr_mask = GENMASK(31, 6),
};
static const struct of_device_id st_rproc_match[] = {
{ .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
{ .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
{},
};
MODULE_DEVICE_TABLE(of, st_rproc_match);
static int st_rproc_parse_dt(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rproc *rproc = platform_get_drvdata(pdev);
struct st_rproc *ddata = rproc->priv;
struct device_node *np = dev->of_node;
int err;
if (ddata->config->sw_reset) {
ddata->sw_reset = devm_reset_control_get_exclusive(dev,
"sw_reset");
if (IS_ERR(ddata->sw_reset)) {
dev_err(dev, "Failed to get S/W Reset\n");
return PTR_ERR(ddata->sw_reset);
}
}
if (ddata->config->pwr_reset) {
ddata->pwr_reset = devm_reset_control_get_exclusive(dev,
"pwr_reset");
if (IS_ERR(ddata->pwr_reset)) {
dev_err(dev, "Failed to get Power Reset\n");
return PTR_ERR(ddata->pwr_reset);
}
}
ddata->clk = devm_clk_get(dev, NULL);
if (IS_ERR(ddata->clk)) {
dev_err(dev, "Failed to get clock\n");
return PTR_ERR(ddata->clk);
}
err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
if (err) {
dev_err(dev, "failed to get clock frequency\n");
return err;
}
ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(ddata->boot_base)) {
dev_err(dev, "Boot base not found\n");
return PTR_ERR(ddata->boot_base);
}
err = of_property_read_u32_index(np, "st,syscfg", 1,
&ddata->boot_offset);
if (err) {
dev_err(dev, "Boot offset not found\n");
return -EINVAL;
}
err = clk_prepare(ddata->clk);
if (err)
dev_err(dev, "failed to get clock\n");
return err;
}
static int st_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct st_rproc *ddata;
struct device_node *np = dev->of_node;
struct rproc *rproc;
struct mbox_chan *chan;
int enabled;
int ret, i;
rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
if (!rproc)
return -ENOMEM;
rproc->has_iommu = false;
ddata = rproc->priv;
ddata->config = (struct st_rproc_config *)device_get_match_data(dev);
if (!ddata->config)
return -ENODEV;
platform_set_drvdata(pdev, rproc);
ret = st_rproc_parse_dt(pdev);
if (ret)
return ret;
enabled = st_rproc_state(pdev);
if (enabled < 0) {
ret = enabled;
goto free_clk;
}
if (enabled) {
atomic_inc(&rproc->power);
rproc->state = RPROC_RUNNING;
} else {
clk_set_rate(ddata->clk, ddata->clk_rate);
}
if (of_property_present(np, "mbox-names")) {
ddata->mbox_client_vq0.dev = dev;
ddata->mbox_client_vq0.tx_done = NULL;
ddata->mbox_client_vq0.tx_block = false;
ddata->mbox_client_vq0.knows_txdone = false;
ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0;
ddata->mbox_client_vq1.dev = dev;
ddata->mbox_client_vq1.tx_done = NULL;
ddata->mbox_client_vq1.tx_block = false;
ddata->mbox_client_vq1.knows_txdone = false;
ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1;
/*
* To control a co-processor without IPC mechanism.
* This driver can be used without mbox and rpmsg.
*/
chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 0\n");
ret = PTR_ERR(chan);
goto free_clk;
}
ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 0\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 1\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;
chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
if (IS_ERR(chan)) {
dev_err(&rproc->dev, "failed to request mbox chan 1\n");
ret = PTR_ERR(chan);
goto free_mbox;
}
ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
}
ret = rproc_add(rproc);
if (ret)
goto free_mbox;
return 0;
free_mbox:
for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
mbox_free_channel(ddata->mbox_chan[i]);
free_clk:
clk_unprepare(ddata->clk);
return ret;
}
static void st_rproc_remove(struct platform_device *pdev)
{
struct rproc *rproc = platform_get_drvdata(pdev);
struct st_rproc *ddata = rproc->priv;
int i;
rproc_del(rproc);
clk_disable_unprepare(ddata->clk);
for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
mbox_free_channel(ddata->mbox_chan[i]);
}
static struct platform_driver st_rproc_driver = {
.probe = st_rproc_probe,
.remove_new = st_rproc_remove,
.driver = {
.name = "st-rproc",
.of_match_table = of_match_ptr(st_rproc_match),
},
};
module_platform_driver(st_rproc_driver);
MODULE_DESCRIPTION("ST Remote Processor Control Driver");
MODULE_AUTHOR("Ludovic Barre <[email protected]>");
MODULE_LICENSE("GPL v2");
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