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- // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
- /*
- * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
- */
- #define LOG_CATEGORY UCLASS_REMOTEPROC
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <fdtdec.h>
- #include <log.h>
- #include <remoteproc.h>
- #include <reset.h>
- #include <asm/io.h>
- #include <dm/device_compat.h>
- #include <linux/err.h>
- /**
- * struct stm32_copro_privdata - power processor private data
- * @reset_ctl: reset controller handle
- * @hold_boot: hold boot controller handle
- * @rsc_table_addr: resource table address
- */
- struct stm32_copro_privdata {
- struct reset_ctl reset_ctl;
- struct reset_ctl hold_boot;
- ulong rsc_table_addr;
- };
- /**
- * 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;
- int ret;
- priv = dev_get_priv(dev);
- ret = reset_get_by_name(dev, "mcu_rst", &priv->reset_ctl);
- if (ret) {
- dev_err(dev, "failed to get reset (%d)\n", ret);
- return ret;
- }
- ret = reset_get_by_name(dev, "hold_boot", &priv->hold_boot);
- if (ret) {
- dev_err(dev, "failed to get hold boot (%d)\n", ret);
- return ret;
- }
- dev_dbg(dev, "probed\n");
- return 0;
- }
- /**
- * 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;
- ulong rsc_table_size;
- int ret;
- priv = dev_get_priv(dev);
- ret = reset_assert(&priv->hold_boot);
- if (ret) {
- dev_err(dev, "Unable to assert hold boot (ret=%d)\n", 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;
- }
- if (rproc_elf32_load_rsc_table(dev, addr, size, &priv->rsc_table_addr,
- &rsc_table_size)) {
- priv->rsc_table_addr = 0;
- dev_warn(dev, "No valid resource table for this firmware\n");
- }
- 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);
- ret = reset_deassert(&priv->hold_boot);
- if (ret) {
- dev_err(dev, "Unable to deassert hold boot (ret=%d)\n", ret);
- return ret;
- }
- /*
- * Once copro running, reset hold boot flag to avoid copro
- * rebooting autonomously (error should never occur)
- */
- ret = reset_assert(&priv->hold_boot);
- if (ret)
- dev_err(dev, "Unable to assert hold boot (ret=%d)\n", ret);
- /* indicates that copro is running */
- writel(TAMP_COPRO_STATE_CRUN, TAMP_COPRO_STATE);
- /* Store rsc_address in bkp register */
- writel(priv->rsc_table_addr, TAMP_COPRO_RSC_TBL_ADDRESS);
- return 0;
- }
- /**
- * 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 = reset_assert(&priv->hold_boot);
- if (ret) {
- dev_err(dev, "Unable to assert hold boot (ret=%d)\n", 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;
- }
- writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
- 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 0 if the remote processor is running, 1 otherwise
- */
- static int stm32_copro_is_running(struct udevice *dev)
- {
- return (readl(TAMP_COPRO_STATE) == TAMP_COPRO_STATE_OFF);
- }
- 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 = sizeof(struct stm32_copro_privdata),
- };
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