diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs/mxs.c')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/mxs.c | 90 |
1 files changed, 23 insertions, 67 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/mxs.c b/arch/arm/cpu/arm926ejs/mxs/mxs.c index e2b4196..45667bd 100644 --- a/arch/arm/cpu/arm926ejs/mxs/mxs.c +++ b/arch/arm/cpu/arm926ejs/mxs/mxs.c @@ -30,7 +30,7 @@ #include <asm/errno.h> #include <asm/io.h> #include <asm/arch/clock.h> -#include <asm/arch/dma.h> +#include <asm/imx-common/dma.h> #include <asm/arch/gpio.h> #include <asm/arch/iomux.h> #include <asm/arch/imx-regs.h> @@ -39,12 +39,6 @@ DECLARE_GLOBAL_DATA_PTR; -/* 1 second delay should be plenty of time for block reset. */ -#define RESET_MAX_TIMEOUT 1000000 - -#define MXS_BLOCK_SFTRST (1 << 31) -#define MXS_BLOCK_CLKGATE (1 << 30) - /* Lowlevel init isn't used on i.MX28, so just have a dummy here */ inline void lowlevel_init(void) {} @@ -82,70 +76,32 @@ void enable_caches(void) #endif } -int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned - int timeout) -{ - while (--timeout) { - if ((readl(®->reg) & mask) == mask) - break; - udelay(1); - } - - return !timeout; -} - -int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned - int timeout) -{ - while (--timeout) { - if ((readl(®->reg) & mask) == 0) - break; - udelay(1); - } - - return !timeout; -} - -int mxs_reset_block(struct mxs_register_32 *reg) -{ - /* Clear SFTRST */ - writel(MXS_BLOCK_SFTRST, ®->reg_clr); - - if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) - return 1; - - /* Clear CLKGATE */ - writel(MXS_BLOCK_CLKGATE, ®->reg_clr); - - /* Set SFTRST */ - writel(MXS_BLOCK_SFTRST, ®->reg_set); - - /* Wait for CLKGATE being set */ - if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT)) - return 1; - - /* Clear SFTRST */ - writel(MXS_BLOCK_SFTRST, ®->reg_clr); - - if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) - return 1; - - /* Clear CLKGATE */ - writel(MXS_BLOCK_CLKGATE, ®->reg_clr); - - if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT)) - return 1; - - return 0; -} - +/* + * This function will craft a jumptable at 0x0 which will redirect interrupt + * vectoring to proper location of U-Boot in RAM. + * + * The structure of the jumptable will be as follows: + * ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times + * <destination address> ... for each previous ldr, thus also repeated 8 times + * + * The "ldr pc, [pc, #0x18]" instruction above loads address from memory at + * offset 0x18 from current value of PC register. Note that PC is already + * incremented by 4 when computing the offset, so the effective offset is + * actually 0x20, this the associated <destination address>. Loading the PC + * register with an address performs a jump to that address. + */ void mx28_fixup_vt(uint32_t start_addr) { - uint32_t *vt = (uint32_t *)0x20; + /* ldr pc, [pc, #0x18] */ + const uint32_t ldr_pc = 0xe59ff018; + /* Jumptable location is 0x0 */ + uint32_t *vt = (uint32_t *)0x0; int i; - for (i = 0; i < 8; i++) - vt[i] = start_addr + (4 * i); + for (i = 0; i < 8; i++) { + vt[i] = ldr_pc; + vt[i + 8] = start_addr + (4 * i); + } } #ifdef CONFIG_ARCH_MISC_INIT |