From: Pali Rohár Date: Thu, 8 Sep 2022 14:06:54 +0000 (+0200) Subject: arm: mvebu: Fix moving internal registers X-Git-Url: http://git.dujemihanovic.xyz/img/sics.gif?a=commitdiff_plain;h=5818198e6a184963c6afc82178b23a64435ace6a;p=u-boot.git arm: mvebu: Fix moving internal registers Commit 5bb2c550b11e ("arm: mvebu: Move internal registers in arch_very_early_init() function") moved code from file cpu.c to lowlevel.c, which moves Marvell internal registers from address INTREG_BASE_ADDR_REG to SOC_REGS_PHY_BASE. But the steps describing how to do it correctly were documented only in older U-Boot versions and commit cefd764222ee ("arm: mvebu: Fix internal register config on A38x") probably unintentionally removed important details about MMU from code comments around. Commit 5bb2c550b11e ("arm: mvebu: Move internal registers in arch_very_early_init() function") implemented code movement according to (now incomplete) comments which resulted in semi-broken code. The result is that I-cache is currently disabled for all Armada 38x boards and maybe there are some other (unreported / undetected) issues. Reimplement it correctly. First flush all caches, then disable MMU and L2 cache and then move Marvell internal registers. There is no need to explicitly disable I-cache. After this change lzmadec command with lzma image of 0x7000000 bytes is doing decompression just 5 seconds. Before this change it was 30 seconds. To make lowlevel.S code more readable, extend asm/pl310.h header file to be compatible with assembler and use macros from this file. Fixes: 5bb2c550b11e ("arm: mvebu: Move internal registers in arch_very_early_init() function") Signed-off-by: Pali Rohár Signed-off-by: Marek Behún Reviewed-by: Stefan Roese --- diff --git a/arch/arm/include/asm/pl310.h b/arch/arm/include/asm/pl310.h index f69e9e45f8..9d4cd68ee4 100644 --- a/arch/arm/include/asm/pl310.h +++ b/arch/arm/include/asm/pl310.h @@ -7,13 +7,12 @@ #ifndef _PL310_H_ #define _PL310_H_ -#include - /* Register bit fields */ #define PL310_AUX_CTRL_ASSOCIATIVITY_MASK (1 << 16) #define L2X0_DYNAMIC_CLK_GATING_EN (1 << 1) #define L2X0_STNDBY_MODE_EN (1 << 0) #define L2X0_CTRL_EN 1 +#define L2X0_CTRL_OFF 0x100 #define L310_SHARED_ATT_OVERRIDE_ENABLE (1 << 22) #define L310_AUX_CTRL_DATA_PREFETCH_MASK (1 << 28) @@ -27,6 +26,10 @@ #define L2X0_CACHE_ID_RTL_MASK 0x3f #define L2X0_CACHE_ID_RTL_R3P2 0x8 +#ifndef __ASSEMBLY__ + +#include + struct pl310_regs { u32 pl310_cache_id; u32 pl310_cache_type; @@ -87,3 +90,5 @@ void pl310_inval_range(u32 start, u32 end); void pl310_clean_inval_range(u32 start, u32 end); #endif + +#endif diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c index 77e403ba73..1f8cdf8744 100644 --- a/arch/arm/mach-mvebu/cpu.c +++ b/arch/arm/mach-mvebu/cpu.c @@ -445,19 +445,6 @@ static void setup_usb_phys(void) */ int arch_cpu_init(void) { - struct pl310_regs *const pl310 = - (struct pl310_regs *)CONFIG_SYS_PL310_BASE; - - if (!IS_ENABLED(CONFIG_ARMADA_XP)) { - /* - * To fully release / unlock this area from cache, we need - * to flush all caches and disable the L2 cache. - */ - icache_disable(); - dcache_disable(); - clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN); - } - /* * We need to call mvebu_mbus_probe() before calling * update_sdram_window_sizes() as it disables all previously diff --git a/arch/arm/mach-mvebu/lowlevel.S b/arch/arm/mach-mvebu/lowlevel.S index b460382c6b..60c2072c35 100644 --- a/arch/arm/mach-mvebu/lowlevel.S +++ b/arch/arm/mach-mvebu/lowlevel.S @@ -3,6 +3,7 @@ #include #include #include +#include ENTRY(arch_very_early_init) #ifdef CONFIG_ARMADA_38X @@ -11,10 +12,36 @@ ENTRY(arch_very_early_init) * register address on Armada 38x. Without this the SDRAM * located at >= 0x4000.0000 is also not accessible, as its * still locked to cache. + * + * So to fully release / unlock this area from cache, we need + * to first flush all caches, then disable the MMU and + * disable the L2 cache. */ + + /* Invalidate L1 I/D */ + mov r0, #0 @ set up for MCR + mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs + mcr p15, 0, r0, c7, c5, 0 @ invalidate icache + mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array + mcr p15, 0, r0, c7, c10, 4 @ DSB + mcr p15, 0, r0, c7, c5, 4 @ ISB + + /* Disable MMU */ mrc p15, 0, r0, c1, c0, 0 bic r0, #CR_M mcr p15, 0, r0, c1, c0, 0 + + /* + * Disable L2 cache + * + * NOTE: Internal registers are still at address INTREG_BASE_ADDR_REG + * but CONFIG_SYS_PL310_BASE is already calculated from base + * address SOC_REGS_PHY_BASE. + */ + ldr r1, =(CONFIG_SYS_PL310_BASE - SOC_REGS_PHY_BASE + INTREG_BASE_ADDR_REG) + ldr r0, [r1, #L2X0_CTRL_OFF] + bic r0, #L2X0_CTRL_EN + str r0, [r1, #L2X0_CTRL_OFF] #endif /* Move internal registers from INTREG_BASE_ADDR_REG to SOC_REGS_PHY_BASE */