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// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <regmap.h>
#include <remoteproc.h>
#include <reset.h>
#include <syscon.h>
#include <asm/io.h>
#define RCC_GCR_HOLD_BOOT 0
#define RCC_GCR_RELEASE_BOOT 1
/**
* struct stm32_copro_privdata - power processor private data
* @reset_ctl: reset controller handle
* @hold_boot_regmap: regmap for remote processor reset hold boot
* @hold_boot_offset: offset of the register controlling the hold boot setting
* @hold_boot_mask: bitmask of the register for the hold boot field
* @is_running: is the remote processor running
*/
struct stm32_copro_privdata {
struct reset_ctl reset_ctl;
struct regmap *hold_boot_regmap;
uint hold_boot_offset;
uint hold_boot_mask;
bool is_running;
};
/**
* stm32_copro_probe() - Basic probe
* @dev: corresponding STM32 remote processor device
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_probe(struct udevice *dev)
{
struct stm32_copro_privdata *priv;
struct regmap *regmap;
const fdt32_t *cell;
int len, ret;
priv = dev_get_priv(dev);
regmap = syscon_regmap_lookup_by_phandle(dev, "st,syscfg-holdboot");
if (IS_ERR(regmap)) {
dev_err(dev, "unable to find holdboot regmap (%ld)\n",
PTR_ERR(regmap));
return PTR_ERR(regmap);
}
cell = dev_read_prop(dev, "st,syscfg-holdboot", &len);
if (len < 3 * sizeof(fdt32_t)) {
dev_err(dev, "holdboot offset and mask not available\n");
return -EINVAL;
}
priv->hold_boot_regmap = regmap;
priv->hold_boot_offset = fdtdec_get_number(cell + 1, 1);
priv->hold_boot_mask = fdtdec_get_number(cell + 2, 1);
ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
if (ret) {
dev_err(dev, "failed to get reset (%d)\n", ret);
return ret;
}
dev_dbg(dev, "probed\n");
return 0;
}
/**
* stm32_copro_set_hold_boot() - Hold boot bit management
* @dev: corresponding STM32 remote processor device
* @hold: hold boot value
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_set_hold_boot(struct udevice *dev, bool hold)
{
struct stm32_copro_privdata *priv;
uint val;
int ret;
priv = dev_get_priv(dev);
val = hold ? RCC_GCR_HOLD_BOOT : RCC_GCR_RELEASE_BOOT;
/*
* Note: shall run an SMC call (STM32_SMC_RCC) if platform is secured.
* To be updated when the code for this SMC service is available which
* is not the case for the time being.
*/
ret = regmap_update_bits(priv->hold_boot_regmap, priv->hold_boot_offset,
priv->hold_boot_mask, val);
if (ret)
dev_err(dev, "failed to set hold boot\n");
return ret;
}
/**
* stm32_copro_device_to_virt() - Convert device address to virtual address
* @dev: corresponding STM32 remote processor device
* @da: device address
* @size: Size of the memory region @da is pointing to
* @return converted virtual address
*/
static void *stm32_copro_device_to_virt(struct udevice *dev, ulong da,
ulong size)
{
fdt32_t in_addr = cpu_to_be32(da), end_addr;
u64 paddr;
paddr = dev_translate_dma_address(dev, &in_addr);
if (paddr == OF_BAD_ADDR) {
dev_err(dev, "Unable to convert address %ld\n", da);
return NULL;
}
end_addr = cpu_to_be32(da + size - 1);
if (dev_translate_dma_address(dev, &end_addr) == OF_BAD_ADDR) {
dev_err(dev, "Unable to convert address %ld\n", da + size - 1);
return NULL;
}
return phys_to_virt(paddr);
}
/**
* stm32_copro_load() - Loadup the STM32 remote processor
* @dev: corresponding STM32 remote processor device
* @addr: Address in memory where image is stored
* @size: Size in bytes of the image
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_load(struct udevice *dev, ulong addr, ulong size)
{
struct stm32_copro_privdata *priv;
int ret;
priv = dev_get_priv(dev);
ret = stm32_copro_set_hold_boot(dev, true);
if (ret)
return ret;
ret = reset_assert(&priv->reset_ctl);
if (ret) {
dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
return ret;
}
return rproc_elf32_load_image(dev, addr, size);
}
/**
* stm32_copro_start() - Start the STM32 remote processor
* @dev: corresponding STM32 remote processor device
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_start(struct udevice *dev)
{
struct stm32_copro_privdata *priv;
int ret;
priv = dev_get_priv(dev);
/* move hold boot from true to false start the copro */
ret = stm32_copro_set_hold_boot(dev, false);
if (ret)
return ret;
/*
* Once copro running, reset hold boot flag to avoid copro
* rebooting autonomously
*/
ret = stm32_copro_set_hold_boot(dev, true);
priv->is_running = !ret;
return ret;
}
/**
* stm32_copro_reset() - Reset the STM32 remote processor
* @dev: corresponding STM32 remote processor device
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_reset(struct udevice *dev)
{
struct stm32_copro_privdata *priv;
int ret;
priv = dev_get_priv(dev);
ret = stm32_copro_set_hold_boot(dev, true);
if (ret)
return ret;
ret = reset_assert(&priv->reset_ctl);
if (ret) {
dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
return ret;
}
priv->is_running = false;
return 0;
}
/**
* stm32_copro_stop() - Stop the STM32 remote processor
* @dev: corresponding STM32 remote processor device
* @return 0 if all went ok, else corresponding -ve error
*/
static int stm32_copro_stop(struct udevice *dev)
{
return stm32_copro_reset(dev);
}
/**
* stm32_copro_is_running() - Is the STM32 remote processor running
* @dev: corresponding STM32 remote processor device
* @return 1 if the remote processor is running, 0 otherwise
*/
static int stm32_copro_is_running(struct udevice *dev)
{
struct stm32_copro_privdata *priv;
priv = dev_get_priv(dev);
return priv->is_running;
}
static const struct dm_rproc_ops stm32_copro_ops = {
.load = stm32_copro_load,
.start = stm32_copro_start,
.stop = stm32_copro_stop,
.reset = stm32_copro_reset,
.is_running = stm32_copro_is_running,
.device_to_virt = stm32_copro_device_to_virt,
};
static const struct udevice_id stm32_copro_ids[] = {
{.compatible = "st,stm32mp1-m4"},
{}
};
U_BOOT_DRIVER(stm32_copro) = {
.name = "stm32_m4_proc",
.of_match = stm32_copro_ids,
.id = UCLASS_REMOTEPROC,
.ops = &stm32_copro_ops,
.probe = stm32_copro_probe,
.priv_auto_alloc_size = sizeof(struct stm32_copro_privdata),
};
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