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arm: mvebu: Move internal registers in arch_very_early_init() function

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Moving of internal registers from INTREG_BASE_ADDR_REG to SOC_REGS_PHY_BASE
needs to be done very early, prior calling any function which may touch
internal registers, like debug_uart_init().

So do it earlier in arch_very_early_init() instead of arch_cpu_init().

Movement is done in proper U-Boot, not in SPL. SPL may return to bootrom
and bootrom requires internal registers at (old) expected location.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2022-05-06 11:05:14 +02:00 • committed by Stefan Roese
parent 948da7773e
commit 5bb2c550b1
4 changed files with 29 additions and 31 deletions
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1
arch/arm/mach-mvebu/Kconfig
View file

@ -16,6 +16,7 @@ config ARMADA_32BIT
select SUPPORT_SPL
select TRANSLATION_OFFSET
select SPL_SYS_NO_VECTOR_TABLE if SPL
select ARCH_VERY_EARLY_INIT
# ARMv7 SoCs...
config ARMADA_375

1
arch/arm/mach-mvebu/Makefile
View file

@ -21,6 +21,7 @@ else # CONFIG_ARCH_KIRKWOOD
obj-y = cpu.o
obj-y += dram.o
obj-y += lowlevel.o
obj-$(CONFIG_DM_RESET) += system-controller.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_ARMADA_375) += ../../../drivers/ddr/marvell/axp/xor.o

31
arch/arm/mach-mvebu/cpu.c
View file

@ -413,20 +413,7 @@ static void update_sdram_window_sizes(void)
}
}
void mmu_disable(void)
{
asm volatile(
"mrc p15, 0, r0, c1, c0, 0\n"
"bic r0, #1\n"
"mcr p15, 0, r0, c1, c0, 0\n");
}
#ifdef CONFIG_ARCH_CPU_INIT
static void set_cbar(u32 addr)
{
asm("mcr p15, 4, %0, c15, c0" : : "r" (addr));
}
#define MV_USB_PHY_BASE (MVEBU_AXP_USB_BASE + 0x800)
#define MV_USB_PHY_PLL_REG(reg) (MV_USB_PHY_BASE | (((reg) & 0xF) << 2))
#define MV_USB_X3_BASE(addr) (MVEBU_AXP_USB_BASE | BIT(11) | \
@ -476,24 +463,6 @@ int arch_cpu_init(void)
struct pl310_regs *const pl310 =
(struct pl310_regs *)CONFIG_SYS_PL310_BASE;
/*
* Only with disabled MMU its possible to switch the base
* register address on Armada 38x. Without this the SDRAM
* located at >= 0x4000.0000 is also not accessible, as its
* still locked to cache.
*/
mmu_disable();
/* Linux expects the internal registers to be at 0xf1000000 */
writel(SOC_REGS_PHY_BASE, INTREG_BASE_ADDR_REG);
set_cbar(SOC_REGS_PHY_BASE + 0xC000);
/*
* From this stage on, the SoC detection is working. As we have
* configured the internal register base to the value used
* in the macros / defines in the U-Boot header (soc.h).
*/
if (mvebu_soc_family() == MVEBU_SOC_A38X) {
/*
* To fully release / unlock this area from cache, we need

27
arch/arm/mach-mvebu/lowlevel.S Normal file
View file

@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0+ */
#include <config.h>
#include <linux/linkage.h>
ENTRY(arch_very_early_init)
#ifdef CONFIG_ARMADA_38X
/*
* Only with disabled MMU its possible to switch the base
* register address on Armada 38x. Without this the SDRAM
* located at >= 0x4000.0000 is also not accessible, as its
* still locked to cache.
*/
mrc p15, 0, r0, c1, c0, 0
bic r0, #1
mcr p15, 0, r0, c1, c0, 0
#endif
/* Move internal registers from INTREG_BASE_ADDR_REG to SOC_REGS_PHY_BASE */
ldr r0, =SOC_REGS_PHY_BASE
ldr r1, =INTREG_BASE_ADDR_REG
str r0, [r1]
add r0, r0, #0xC000
mcr p15, 4, r0, c15, c0
bx lr
ENDPROC(arch_very_early_init)