Merge tag 'rcar_rst_rproc-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel into rproc-next

Renesas R-Car Reset Controller remoteproc API

Definition of rcar_rst_set_rproc_boot_addr(), to be consumed by the
Renesas R-Car Gen3 remote processor driver.

Signed-off-by: Mathieu Poirier <[email protected]>

Author: mathieupoirier

drivers/soc/renesas/rcar-rst.c

@@ -13,15 +13,43 @@
 #define WDTRSTCR_RESET		0xA55A0002
 #define WDTRSTCR		0x0054
 
+#define CR7BAR			0x0070
+#define CR7BAREN		BIT(4)
+#define CR7BAR_MASK		0xFFFC0000
+
+static void __iomem *rcar_rst_base;
+static u32 saved_mode __initdata;
+static int (*rcar_rst_set_rproc_boot_addr_func)(u64 boot_addr);
+
 static int rcar_rst_enable_wdt_reset(void __iomem *base)
 {
 	iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
 	return 0;
 }
 
+/*
+ * Most of the R-Car Gen3 SoCs have an ARM Realtime Core.
+ * Firmware boot address has to be set in CR7BAR before
+ * starting the realtime core.
+ * Boot address must be aligned on a 256k boundary.
+ */
+static int rcar_rst_set_gen3_rproc_boot_addr(u64 boot_addr)
+{
+	if (boot_addr & ~(u64)CR7BAR_MASK) {
+		pr_err("Invalid boot address got %llx\n", boot_addr);
+		return -EINVAL;
+	}
+
+	iowrite32(boot_addr, rcar_rst_base + CR7BAR);
+	iowrite32(boot_addr | CR7BAREN, rcar_rst_base + CR7BAR);
+
+	return 0;
+}
+
 struct rst_config {
 	unsigned int modemr;		/* Mode Monitoring Register Offset */
 	int (*configure)(void __iomem *base);	/* Platform specific config */
+	int (*set_rproc_boot_addr)(u64 boot_addr);
 };
 
 static const struct rst_config rcar_rst_gen1 __initconst = {
@@ -35,6 +63,7 @@ static const struct rst_config rcar_rst_gen2 __initconst = {
 
 static const struct rst_config rcar_rst_gen3 __initconst = {
 	.modemr = 0x60,
+	.set_rproc_boot_addr = rcar_rst_set_gen3_rproc_boot_addr,
 };
 
 static const struct rst_config rcar_rst_r8a779a0 __initconst = {
@@ -76,9 +105,6 @@ static const struct of_device_id rcar_rst_matches[] __initconst = {
 	{ /* sentinel */ }
 };
 
-static void __iomem *rcar_rst_base __initdata;
-static u32 saved_mode __initdata;
-
 static int __init rcar_rst_init(void)
 {
 	const struct of_device_id *match;
@@ -100,6 +126,8 @@ static int __init rcar_rst_init(void)
 
 	rcar_rst_base = base;
 	cfg = match->data;
+	rcar_rst_set_rproc_boot_addr_func = cfg->set_rproc_boot_addr;
+
 	saved_mode = ioread32(base + cfg->modemr);
 	if (cfg->configure) {
 		error = cfg->configure(base);
@@ -130,3 +158,12 @@ int __init rcar_rst_read_mode_pins(u32 *mode)
 	*mode = saved_mode;
 	return 0;
 }
+
+int rcar_rst_set_rproc_boot_addr(u64 boot_addr)
+{
+	if (!rcar_rst_set_rproc_boot_addr_func)
+		return -EIO;
+
+	return rcar_rst_set_rproc_boot_addr_func(boot_addr);
+}
+EXPORT_SYMBOL_GPL(rcar_rst_set_rproc_boot_addr);

include/linux/soc/renesas/rcar-rst.h

@@ -4,8 +4,10 @@
 
 #ifdef CONFIG_RST_RCAR
 int rcar_rst_read_mode_pins(u32 *mode);
+int rcar_rst_set_rproc_boot_addr(u64 boot_addr);
 #else
 static inline int rcar_rst_read_mode_pins(u32 *mode) { return -ENODEV; }
+static inline int rcar_rst_set_rproc_boot_addr(u64 boot_addr) { return -ENODEV; }
 #endif
 
 #endif /* __LINUX_SOC_RENESAS_RCAR_RST_H__ */