[PATCH v5 2/7] rpi5: Use devicetree as alternative way to read IO base addresses

[Ivan T. Ivanov]

From: Dmitry Malkin <dmitry at bedrocksystems.com>

MBOX and Watchdog on RPi5/bcm2712 have a different base IO offsets.
Find them via devicetree blob passed by bootloader.

Signed-off-by: Dmitry Malkin <dmitry at bedrocksystems.com>
Reviewed-by: Matthias Brugger <mbrugger at suse.com>
Signed-off-by: Ivan T. Ivanov <iivanov at suse.de>
---
 arch/arm/mach-bcm283x/include/mach/base.h  |  5 ++-
 arch/arm/mach-bcm283x/include/mach/mbox.h  |  3 +-
 arch/arm/mach-bcm283x/include/mach/sdhci.h |  3 +-
 arch/arm/mach-bcm283x/include/mach/timer.h |  3 +-
 arch/arm/mach-bcm283x/include/mach/wdog.h  |  3 +-
 arch/arm/mach-bcm283x/init.c               | 43 ++++++++++++++++++----
 6 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/arch/arm/mach-bcm283x/include/mach/base.h b/arch/arm/mach-bcm283x/include/mach/base.h
index 4ccaf69693..6de99e7ea1 100644
--- a/arch/arm/mach-bcm283x/include/mach/base.h
+++ b/arch/arm/mach-bcm283x/include/mach/base.h
@@ -6,7 +6,10 @@
 #ifndef _BCM283x_BASE_H_
 #define _BCM283x_BASE_H_
 
-extern unsigned long rpi_bcm283x_base;
+extern unsigned long rpi_mbox_base;
+extern unsigned long rpi_timer_base;
+extern unsigned long rpi_sdhci_base;
+extern unsigned long rpi_wdog_base;
 
 #ifdef CONFIG_ARMV7_LPAE
 #ifdef CONFIG_TARGET_RPI_4_32B
diff --git a/arch/arm/mach-bcm283x/include/mach/mbox.h b/arch/arm/mach-bcm283x/include/mach/mbox.h
index 490664f878..35d4e2f075 100644
--- a/arch/arm/mach-bcm283x/include/mach/mbox.h
+++ b/arch/arm/mach-bcm283x/include/mach/mbox.h
@@ -38,8 +38,7 @@
 
 /* Raw mailbox HW */
 
-#define BCM2835_MBOX_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \
-				 rpi_bcm283x_base + 0x0000b880; })
+#define BCM2835_MBOX_PHYSADDR	rpi_mbox_base
 
 struct bcm2835_mbox_regs {
 	u32 read;
diff --git a/arch/arm/mach-bcm283x/include/mach/sdhci.h b/arch/arm/mach-bcm283x/include/mach/sdhci.h
index 7323690687..e837c679c4 100644
--- a/arch/arm/mach-bcm283x/include/mach/sdhci.h
+++ b/arch/arm/mach-bcm283x/include/mach/sdhci.h
@@ -8,8 +8,7 @@
 
 #include <asm/arch/base.h>
 
-#define BCM2835_SDHCI_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \
-				  rpi_bcm283x_base + 0x00300000; })
+#define BCM2835_SDHCI_PHYSADDR	rpi_sdhci_base
 
 int bcm2835_sdhci_init(u32 regbase, u32 emmc_freq);
 
diff --git a/arch/arm/mach-bcm283x/include/mach/timer.h b/arch/arm/mach-bcm283x/include/mach/timer.h
index 5567dbd7f3..60500a256d 100644
--- a/arch/arm/mach-bcm283x/include/mach/timer.h
+++ b/arch/arm/mach-bcm283x/include/mach/timer.h
@@ -11,8 +11,7 @@
 #include <linux/bug.h>
 #endif
 
-#define BCM2835_TIMER_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \
-				  rpi_bcm283x_base + 0x00003000; })
+#define BCM2835_TIMER_PHYSADDR	rpi_timer_base
 
 #define BCM2835_TIMER_CS_M3	(1 << 3)
 #define BCM2835_TIMER_CS_M2	(1 << 2)
diff --git a/arch/arm/mach-bcm283x/include/mach/wdog.h b/arch/arm/mach-bcm283x/include/mach/wdog.h
index 9942666720..b950560674 100644
--- a/arch/arm/mach-bcm283x/include/mach/wdog.h
+++ b/arch/arm/mach-bcm283x/include/mach/wdog.h
@@ -8,8 +8,7 @@
 
 #include <asm/arch/base.h>
 
-#define BCM2835_WDOG_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \
-				 rpi_bcm283x_base + 0x00100000; })
+#define BCM2835_WDOG_PHYSADDR	rpi_wdog_base
 
 struct bcm2835_wdog_regs {
 	u32 unknown0[7];
diff --git a/arch/arm/mach-bcm283x/init.c b/arch/arm/mach-bcm283x/init.c
index f1a0c8588d..016bc1eb41 100644
--- a/arch/arm/mach-bcm283x/init.c
+++ b/arch/arm/mach-bcm283x/init.c
@@ -146,7 +146,11 @@ static void rpi_update_mem_map(void)
 static void rpi_update_mem_map(void) {}
 #endif
 
-unsigned long rpi_bcm283x_base = 0x3f000000;
+/* Default bcm283x devices addresses */
+unsigned long rpi_mbox_base  = 0x3f00b880;
+unsigned long rpi_sdhci_base = 0x3f300000;
+unsigned long rpi_wdog_base  = 0x3f100000;
+unsigned long rpi_timer_base = 0x3f003000;
 
 int arch_cpu_init(void)
 {
@@ -157,22 +161,45 @@ int arch_cpu_init(void)
 
 int mach_cpu_init(void)
 {
-	int ret, soc_offset;
+	int ret, soc, offset;
 	u64 io_base, size;
 
 	rpi_update_mem_map();
 
 	/* Get IO base from device tree */
-	soc_offset = fdt_path_offset(gd->fdt_blob, "/soc");
-	if (soc_offset < 0)
-		return soc_offset;
+	soc = fdt_path_offset(gd->fdt_blob, "/soc");
+	if (soc < 0)
+		return soc;
 
-	ret = fdt_read_range((void *)gd->fdt_blob, soc_offset, 0, NULL,
-				&io_base, &size);
+	ret = fdt_read_range((void *)gd->fdt_blob, soc, 0, NULL,
+			     &io_base, &size);
 	if (ret)
 		return ret;
 
-	rpi_bcm283x_base = io_base;
+	rpi_mbox_base  = io_base + 0x00b880;
+	rpi_sdhci_base = io_base + 0x300000;
+	rpi_wdog_base  = io_base + 0x100000;
+	rpi_timer_base = io_base + 0x003000;
+
+	offset = fdt_node_offset_by_compatible(gd->fdt_blob, soc,
+					       "brcm,bcm2835-mbox");
+	if (offset > soc)
+		rpi_mbox_base = fdt_get_base_address(gd->fdt_blob, offset);
+
+	offset = fdt_node_offset_by_compatible(gd->fdt_blob, soc,
+					       "brcm,bcm2835-sdhci");
+	if (offset > soc)
+		rpi_sdhci_base = fdt_get_base_address(gd->fdt_blob, offset);
+
+	offset = fdt_node_offset_by_compatible(gd->fdt_blob, soc,
+					       "brcm,bcm2835-system-timer");
+	if (offset > soc)
+		rpi_timer_base = fdt_get_base_address(gd->fdt_blob, offset);
+
+	offset = fdt_node_offset_by_compatible(gd->fdt_blob, soc,
+					       "brcm,bcm2712-pm");
+	if (offset > soc)
+		rpi_wdog_base = fdt_get_base_address(gd->fdt_blob, offset);
 
 	return 0;
 }
-- 
2.43.0