rpi5: add alternative way to get MBOX address via FDT node

Same note about descriptive commit titles, it's useful not to have 3 consecutive commits with the same title.

MBOX on RPI5/bcm2712 has a different offset. Find it via "brcm,bcm2835-mbox" node.

Do we do use the DT node just for the RPi5 and the old method for all older RPi, or do we move all generations to finding it by DT?

Signed-off-by: Dmitry Malkin dmitry@bedrocksystems.com

v2: new patch

---

arch/arm/mach-bcm283x/include/mach/base.h | 1 + arch/arm/mach-bcm283x/include/mach/mbox.h | 4 ++-- arch/arm/mach-bcm283x/init.c | 12 +++++++++++- 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-bcm283x/include/mach/base.h b/arch/arm/mach-bcm283x/include/mach/base.h index 4ccaf69693..8cd224921e 100644 --- a/arch/arm/mach-bcm283x/include/mach/base.h +++ b/arch/arm/mach-bcm283x/include/mach/base.h @@ -7,6 +7,7 @@ #define _BCM283x_BASE_H_

extern unsigned long rpi_bcm283x_base; +extern unsigned long rpi_bcm283x_mbox_addr;

#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..ad086be467 100644 --- a/arch/arm/mach-bcm283x/include/mach/mbox.h +++ b/arch/arm/mach-bcm283x/include/mach/mbox.h @@ -38,8 +38,8 @@

/* Raw mailbox HW */

-#define BCM2835_MBOX_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \

•             rpi_bcm283x_base + 0x0000b880; })
  

+#define BCM2835_MBOX_PHYSADDR ({ BUG_ON(!rpi_bcm283x_mbox_addr); \

•             rpi_bcm283x_mbox_addr; })
  
  

struct bcm2835_mbox_regs { u32 read; diff --git a/arch/arm/mach-bcm283x/init.c b/arch/arm/mach-bcm283x/init.c index 362838e9b9..aef3a31f29 100644 --- a/arch/arm/mach-bcm283x/init.c +++ b/arch/arm/mach-bcm283x/init.c @@ -145,6 +145,11 @@ static void rpi_update_mem_map(void) {}

unsigned long rpi_bcm283x_base = 0x3f000000;

+/* This is intialized before relocation. Enforce .data section usage.

• • Otherwise it's going to .bss and will be zero after relocation.
• */

+unsigned long __section(".data") rpi_bcm283x_mbox_addr;

int arch_cpu_init(void) { icache_enable(); @@ -154,7 +159,7 @@ int arch_cpu_init(void)

int mach_cpu_init(void) {

• int ret, soc_offset;

• int ret, soc_offset, mbox_offset; u64 io_base, size;

  rpi_update_mem_map();

@@ -170,6 +175,11 @@ int mach_cpu_init(void) return ret;

 rpi_bcm283x_base = io_base;

• rpi_bcm283x_mbox_addr = rpi_bcm283x_base + 0xb880;
• mbox_offset = fdt_node_offset_by_compatible((void*)gd->fdt_blob,

soc_offset, "brcm,bcm2835-mbox");

• if (mbox_offset > soc_offset)

•    rpi_bcm283x_mbox_addr =
  

fdt_get_base_address((void*)gd->fdt_blob, mbox_offset);

 return 0;

}

2.40.1