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remoteproc: stm32: use reset for hold boot

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Use the reset function to handle the hold boot bit in RCC
with device tree handle with MCU_HOLD_BOOT identifier.

This generic reset allows to remove the two specific properties:
- st,syscfg-holdboot
- st,syscfg-tz

This patch prepares alignment with kernel device tree.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Fabien DESSENNE <fabien.dessenne@st.com>
Cc: Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-10-15 15:01:12 +02:00
parent d8d29a4489
commit 5a536dfe33
2 changed files with 33 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/dts/stm32mp15-u-boot.dtsi
View File

@ -159,6 +159,13 @@
u-boot,dm-pre-proper;
};
/* temp = waiting kernel update */
&m4_rproc {
resets = <&rcc MCU_R>,
<&rcc MCU_HOLD_BOOT_R>;
reset-names = "mcu_rst", "hold_boot";
};
&pinctrl {
u-boot,dm-pre-reloc;
};

95
drivers/remoteproc/stm32_copro.c
View File

@ -8,30 +8,21 @@
#include <errno.h>
#include <fdtdec.h>
#include <log.h>
#include <regmap.h>
#include <remoteproc.h>
#include <reset.h>
#include <syscon.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/err.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
* @hold_boot: hold boot controller handle
* @rsc_table_addr: resource table address
*/
struct stm32_copro_privdata {
struct reset_ctl reset_ctl;
struct regmap *hold_boot_regmap;
uint hold_boot_offset;
uint hold_boot_mask;
struct reset_ctl hold_boot;
ulong rsc_table_addr;
};
@ -43,69 +34,27 @@ struct stm32_copro_privdata {
static int stm32_copro_probe(struct udevice *dev)
{
struct stm32_copro_privdata *priv;
struct regmap *regmap;
const fdt32_t *cell;
int len, ret;
int 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);
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_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
@ -149,9 +98,11 @@ static int stm32_copro_load(struct udevice *dev, ulong addr, ulong size)
priv = dev_get_priv(dev);
ret = stm32_copro_set_hold_boot(dev, true);
if (ret)
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) {
@ -180,16 +131,20 @@ static int stm32_copro_start(struct udevice *dev)
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)
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
*/
ret = stm32_copro_set_hold_boot(dev, true);
ret = reset_assert(&priv->hold_boot);
if (ret)
dev_err(dev, "Unable to assert hold boot (ret=%d)\n", ret);
writel(ret ? TAMP_COPRO_STATE_OFF : TAMP_COPRO_STATE_CRUN,
TAMP_COPRO_STATE);
if (!ret)
@ -211,9 +166,11 @@ static int stm32_copro_reset(struct udevice *dev)
priv = dev_get_priv(dev);
ret = stm32_copro_set_hold_boot(dev, true);
if (ret)
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) {