remoteproc: stm32: use reset for hold boot

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>

arch/arm/dts/stm32mp15-u-boot.dtsi

@@ -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;
 };

drivers/remoteproc/stm32_copro.c

@@ -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;
 };
 
@@ -43,32 +34,19 @@ 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;
+	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;
 	}
 
-	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, "hold_boot", &priv->hold_boot);
 	if (ret) {
-		dev_err(dev, "failed to get reset (%d)\n", ret);
+		dev_err(dev, "failed to get hold boot (%d)\n", ret);
 		return ret;
 	}
 
@@ -77,35 +55,6 @@ static int stm32_copro_probe(struct udevice *dev)
 	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) {