/*
* TI AMx3 Wakeup M3 Remote Processor driver
*
* Copyright (C) 2014-2015 Texas Instruments, Inc.
*
* Dave Gerlach <d-gerlach@ti.com>
* Suman Anna <s-anna@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/remoteproc.h>
#include <linux/platform_data/wkup_m3.h>
#include "remoteproc_internal.h"
#define WKUPM3_MEM_MAX 2
/**
* struct wkup_m3_mem - WkupM3 internal memory structure
* @cpu_addr: MPU virtual address of the memory region
* @bus_addr: Bus address used to access the memory region
* @dev_addr: Device address from Wakeup M3 view
* @size: Size of the memory region
*/
struct wkup_m3_mem {
void __iomem *cpu_addr;
phys_addr_t bus_addr;
u32 dev_addr;
size_t size;
};
/**
* struct wkup_m3_rproc - WkupM3 remote processor state
* @rproc: rproc handle
* @pdev: pointer to platform device
* @mem: WkupM3 memory information
*/
struct wkup_m3_rproc {
struct rproc *rproc;
struct platform_device *pdev;
struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
};
static int wkup_m3_rproc_start(struct rproc *rproc)
{
struct wkup_m3_rproc *wkupm3 = rproc->priv;
struct platform_device *pdev = wkupm3->pdev;
struct device *dev = &pdev->dev;
struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
if (pdata->deassert_reset(pdev, pdata->reset_name)) {
dev_err(dev, "Unable to reset wkup_m3!\n");
return -ENODEV;
}
return 0;
}
static int wkup_m3_rproc_stop(struct rproc *rproc)
{
struct wkup_m3_rproc *wkupm3 = rproc->priv;
struct platform_device *pdev = wkupm3->pdev;
struct device *dev = &pdev->dev;
struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
if (pdata->assert_reset(pdev, pdata->reset_name)) {
dev_err(dev, "Unable to assert reset of wkup_m3!\n");
return -ENODEV;
}
return 0;
}
static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
{
struct wkup_m3_rproc *wkupm3 = rproc->priv;
void *va = NULL;
int i;
u32 offset;
if (len <= 0)
return NULL;
for (i = 0; i < WKUPM3_MEM_MAX; i++) {
if (da >= wkupm3->mem[i].dev_addr && da + len <=
wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
offset = da - wkupm3->mem[i].dev_addr;
/* __force to make sparse happy with type conversion */
va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
break;
}
}
return va;
}
static const struct rproc_ops wkup_m3_rproc_ops = {
.start = wkup_m3_rproc_start,
.stop = wkup_m3_rproc_stop,
.da_to_va = wkup_m3_rproc_da_to_va,
};
static const struct of_device_id wkup_m3_rproc_of_match[] = {
{ .compatible = "ti,am3352-wkup-m3", },
{ .compatible = "ti,am4372-wkup-m3", },
{},
};
MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
static int wkup_m3_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct wkup_m3_platform_data *pdata = dev->platform_data;
/* umem always needs to be processed first */
const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
struct wkup_m3_rproc *wkupm3;
const char *fw_name;
struct rproc *rproc;
struct resource *res;
const __be32 *addrp;
u32 l4_offset = 0;
u64 size;
int ret;
int i;
if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
pdata->reset_name)) {
dev_err(dev, "Platform data missing!\n");
return -ENODEV;
}
ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
&fw_name);
if (ret) {
dev_err(dev, "No firmware filename given\n");
return -ENODEV;
}
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
goto err;
}
rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
fw_name, sizeof(*wkupm3));
if (!rproc) {
ret = -ENOMEM;
goto err;
}
rproc->auto_boot = false;
wkupm3 = rproc->priv;
wkupm3->rproc = rproc;
wkupm3->pdev = pdev;
for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
mem_names[i]);
wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
i);
ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
goto err;
}
wkupm3->mem[i].bus_addr = res->start;
wkupm3->mem[i].size = resource_size(res);
addrp = of_get_address(dev->of_node, i, &size, NULL);
/*
* The wkupm3 has umem at address 0 in its view, so the device
* addresses for each memory region is computed as a relative
* offset of the bus address for umem, and therefore needs to be
* processed first.
*/
if (!strcmp(mem_names[i], "umem"))
l4_offset = be32_to_cpu(*addrp);
wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
}
dev_set_drvdata(dev, rproc);
ret = rproc_add(rproc);
if (ret) {
dev_err(dev, "rproc_add failed\n");
goto err_put_rproc;
}
return 0;
err_put_rproc:
rproc_free(rproc);
err:
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
return ret;
}
static int wkup_m3_rproc_remove(struct platform_device *pdev)
{
struct rproc *rproc = platform_get_drvdata(pdev);
rproc_del(rproc);
rproc_free(rproc);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
static int wkup_m3_rpm_suspend(struct device *dev)
{
return -EBUSY;
}
static int wkup_m3_rpm_resume(struct device *dev)
{
return 0;
}
#endif
static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
};
static struct platform_driver wkup_m3_rproc_driver = {
.probe = wkup_m3_rproc_probe,
.remove = wkup_m3_rproc_remove,
.driver = {
.name = "wkup_m3_rproc",
.of_match_table = wkup_m3_rproc_of_match,
.pm = &wkup_m3_rproc_pm_ops,
},
};
module_platform_driver(wkup_m3_rproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
