[PATCH v3 07/22] arm: mach-k3: common: Helper for LPM meta data address from DT

[Markus Schneider-Pargmann]

Add a small helper that uses memory regions referenced by the R5
devicetree node to calculate the LPM meta data address.

Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
---
 arch/arm/mach-k3/common.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-k3/common.h |  1 +
 2 files changed, 44 insertions(+)

diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index 1ef560e2fb936c4245323bbebc5af3ec277b8792..98974d446fd76872869f2c9b88abd060213c234c 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -16,6 +16,8 @@
 #include <linux/printk.h>
 #include "common.h"
 #include <dm.h>
+#include <dm/of_access.h>
+#include <dm/ofnode.h>
 #include <remoteproc.h>
 #include <asm/cache.h>
 #include <linux/soc/ti/ti_sci_protocol.h>
@@ -33,6 +35,7 @@
 #include <wait_bit.h>
 
 #define CLKSTOP_TRANSITION_TIMEOUT_MS	10
+#define K3_R5_MEMREGION_LPM_METADATA_OFFSET	0x108000
 
 #define PROC_BOOT_CTRL_FLAG_R5_CORE_HALT	0x00000001
 #define PROC_BOOT_STATUS_FLAG_R5_WFI		0x00000002
@@ -187,6 +190,42 @@ bool wkup_ctrl_is_lpm_exit(void)
 }
 
 #if IS_ENABLED(CONFIG_K3_IODDR)
+int wkup_r5f_am62_lpm_meta_data_addr(u64 *meta_data_addr)
+{
+	struct ofnode_phandle_args memregion_phandle;
+	ofnode memregion;
+	ofnode wkup_bus;
+	int ret;
+
+	wkup_bus = ofnode_path("/bus at f0000/bus at b00000");
+	if (!ofnode_valid(wkup_bus)) {
+		printf("Failed to find wkup bus\n");
+		return -EINVAL;
+	}
+
+	memregion = ofnode_by_compatible(wkup_bus, "ti,am62-r5f");
+	if (!ofnode_valid(memregion)) {
+		printf("Failed to find r5f devicetree node ti,am62-r5f\n");
+		return -EINVAL;
+	}
+
+	ret = ofnode_parse_phandle_with_args(memregion, "memory-region", NULL,
+					     0, 1, &memregion_phandle);
+	if (ret) {
+		printf("Failed to parse phandle for second memory region\n");
+		return ret;
+	}
+
+	ret = ofnode_read_u64_index(memregion_phandle.node, "reg", 0, meta_data_addr);
+	if (ret) {
+		printf("Failed to read memory region offset\n");
+		return ret;
+	}
+
+	*meta_data_addr += K3_R5_MEMREGION_LPM_METADATA_OFFSET;
+
+	return 0;
+}
 static int lpm_restore_context(u64 ctx_addr)
 {
 	struct ti_sci_handle *ti_sci = get_ti_sci_handle();
@@ -224,6 +263,10 @@ void __noreturn lpm_resume_from_ddr(u64 meta_data_addr)
 	image_entry();
 }
 #else
+int wkup_r5f_am62_lpm_meta_data_addr(u64 *meta_data_addr)
+{
+	return -EINVAL;
+}
 
 void __noreturn lpm_resume_from_ddr(u64 meta_data_addr)
 {
diff --git a/arch/arm/mach-k3/common.h b/arch/arm/mach-k3/common.h
index 3333b30b56e711b082d4da7f6773cf0002bbfe30..c579796a7a3baec12792ad137c5c03e7ea361d55 100644
--- a/arch/arm/mach-k3/common.h
+++ b/arch/arm/mach-k3/common.h
@@ -53,6 +53,7 @@ void ti_secure_image_check_binary(void **p_image, size_t *p_size);
 int shutdown_mcu_r5_core1(void);
 void wkup_ctrl_remove_can_io_isolation_if_set(void);
 bool wkup_ctrl_is_lpm_exit(void);
+int wkup_r5f_am62_lpm_meta_data_addr(u64 *meta_data_addr);
 void lpm_resume_from_ddr(u64 meta_data_addr);
 
 #if (IS_ENABLED(CONFIG_K3_QOS))

-- 
2.49.0