271 lines
6.8 KiB
C
271 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <regmap.h>
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#include <remoteproc.h>
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#include <reset.h>
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#include <syscon.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <linux/err.h>
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#define RCC_GCR_HOLD_BOOT 0
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#define RCC_GCR_RELEASE_BOOT 1
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/**
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* struct stm32_copro_privdata - power processor private data
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* @reset_ctl: reset controller handle
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* @hold_boot_regmap: regmap for remote processor reset hold boot
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* @hold_boot_offset: offset of the register controlling the hold boot setting
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* @hold_boot_mask: bitmask of the register for the hold boot field
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* @rsc_table_addr: resource table address
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*/
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struct stm32_copro_privdata {
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struct reset_ctl reset_ctl;
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struct regmap *hold_boot_regmap;
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uint hold_boot_offset;
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uint hold_boot_mask;
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ulong rsc_table_addr;
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};
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/**
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* stm32_copro_probe() - Basic probe
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* @dev: corresponding STM32 remote processor device
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_probe(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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struct regmap *regmap;
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const fdt32_t *cell;
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int len, ret;
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priv = dev_get_priv(dev);
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regmap = syscon_regmap_lookup_by_phandle(dev, "st,syscfg-holdboot");
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if (IS_ERR(regmap)) {
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dev_err(dev, "unable to find holdboot regmap (%ld)\n",
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PTR_ERR(regmap));
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return PTR_ERR(regmap);
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}
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cell = dev_read_prop(dev, "st,syscfg-holdboot", &len);
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if (len < 3 * sizeof(fdt32_t)) {
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dev_err(dev, "holdboot offset and mask not available\n");
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return -EINVAL;
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}
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priv->hold_boot_regmap = regmap;
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priv->hold_boot_offset = fdtdec_get_number(cell + 1, 1);
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priv->hold_boot_mask = fdtdec_get_number(cell + 2, 1);
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ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
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if (ret) {
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dev_err(dev, "failed to get reset (%d)\n", ret);
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return ret;
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}
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dev_dbg(dev, "probed\n");
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return 0;
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}
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/**
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* stm32_copro_set_hold_boot() - Hold boot bit management
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* @dev: corresponding STM32 remote processor device
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* @hold: hold boot value
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_set_hold_boot(struct udevice *dev, bool hold)
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{
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struct stm32_copro_privdata *priv;
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uint val;
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int ret;
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priv = dev_get_priv(dev);
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val = hold ? RCC_GCR_HOLD_BOOT : RCC_GCR_RELEASE_BOOT;
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/*
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* Note: shall run an SMC call (STM32_SMC_RCC) if platform is secured.
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* To be updated when the code for this SMC service is available which
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* is not the case for the time being.
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*/
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ret = regmap_update_bits(priv->hold_boot_regmap, priv->hold_boot_offset,
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priv->hold_boot_mask, val);
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if (ret)
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dev_err(dev, "failed to set hold boot\n");
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return ret;
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}
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/**
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* stm32_copro_device_to_virt() - Convert device address to virtual address
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* @dev: corresponding STM32 remote processor device
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* @da: device address
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* @size: Size of the memory region @da is pointing to
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* @return converted virtual address
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*/
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static void *stm32_copro_device_to_virt(struct udevice *dev, ulong da,
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ulong size)
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{
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fdt32_t in_addr = cpu_to_be32(da), end_addr;
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u64 paddr;
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paddr = dev_translate_dma_address(dev, &in_addr);
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if (paddr == OF_BAD_ADDR) {
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dev_err(dev, "Unable to convert address %ld\n", da);
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return NULL;
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}
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end_addr = cpu_to_be32(da + size - 1);
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if (dev_translate_dma_address(dev, &end_addr) == OF_BAD_ADDR) {
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dev_err(dev, "Unable to convert address %ld\n", da + size - 1);
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return NULL;
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}
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return phys_to_virt(paddr);
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}
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/**
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* stm32_copro_load() - Loadup the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* @addr: Address in memory where image is stored
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* @size: Size in bytes of the image
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_load(struct udevice *dev, ulong addr, ulong size)
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{
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struct stm32_copro_privdata *priv;
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ulong rsc_table_size;
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int ret;
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priv = dev_get_priv(dev);
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ret = stm32_copro_set_hold_boot(dev, true);
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if (ret)
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return ret;
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ret = reset_assert(&priv->reset_ctl);
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if (ret) {
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dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
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return ret;
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}
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if (rproc_elf32_load_rsc_table(dev, addr, size, &priv->rsc_table_addr,
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&rsc_table_size)) {
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priv->rsc_table_addr = 0;
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dev_warn(dev, "No valid resource table for this firmware\n");
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}
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return rproc_elf32_load_image(dev, addr, size);
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}
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/**
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* stm32_copro_start() - Start the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_start(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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int ret;
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priv = dev_get_priv(dev);
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/* move hold boot from true to false start the copro */
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ret = stm32_copro_set_hold_boot(dev, false);
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if (ret)
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return ret;
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/*
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* Once copro running, reset hold boot flag to avoid copro
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* rebooting autonomously
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*/
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ret = stm32_copro_set_hold_boot(dev, true);
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writel(ret ? TAMP_COPRO_STATE_OFF : TAMP_COPRO_STATE_CRUN,
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TAMP_COPRO_STATE);
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if (!ret)
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/* Store rsc_address in bkp register */
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writel(priv->rsc_table_addr, TAMP_COPRO_RSC_TBL_ADDRESS);
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return ret;
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}
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/**
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* stm32_copro_reset() - Reset the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_reset(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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int ret;
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priv = dev_get_priv(dev);
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ret = stm32_copro_set_hold_boot(dev, true);
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if (ret)
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return ret;
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ret = reset_assert(&priv->reset_ctl);
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if (ret) {
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dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
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return ret;
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}
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writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
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return 0;
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}
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/**
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* stm32_copro_stop() - Stop the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* @return 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_stop(struct udevice *dev)
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{
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return stm32_copro_reset(dev);
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}
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/**
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* stm32_copro_is_running() - Is the STM32 remote processor running
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* @dev: corresponding STM32 remote processor device
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* @return 0 if the remote processor is running, 1 otherwise
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*/
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static int stm32_copro_is_running(struct udevice *dev)
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{
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return (readl(TAMP_COPRO_STATE) == TAMP_COPRO_STATE_OFF);
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}
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static const struct dm_rproc_ops stm32_copro_ops = {
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.load = stm32_copro_load,
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.start = stm32_copro_start,
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.stop = stm32_copro_stop,
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.reset = stm32_copro_reset,
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.is_running = stm32_copro_is_running,
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.device_to_virt = stm32_copro_device_to_virt,
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};
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static const struct udevice_id stm32_copro_ids[] = {
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{.compatible = "st,stm32mp1-m4"},
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{}
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};
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U_BOOT_DRIVER(stm32_copro) = {
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.name = "stm32_m4_proc",
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.of_match = stm32_copro_ids,
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.id = UCLASS_REMOTEPROC,
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.ops = &stm32_copro_ops,
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.probe = stm32_copro_probe,
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.priv_auto_alloc_size = sizeof(struct stm32_copro_privdata),
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};
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