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#include <common.h>
#include <mach/xload.h>
#include <mach/sama5_bootsource.h>
#include <mach/hardware.h>
#include <mach/sama5d2_ll.h>
#include <mach/gpio.h>
#include <linux/sizes.h>
#include <asm/cache.h>
#include <pbl.h>
static void __naked __noreturn xload_bb(void __noreturn (*bb)(void), u32 r4)
{
asm volatile("mov r4, %0" : : "r"(r4) : );
asm volatile("bx %0" : : "r"(bb) : );
}
static void at91_fat_start_image(struct pbl_bio *bio,
void *buf, unsigned int len,
u32 r4)
{
void __noreturn (*bb)(void);
int ret;
ret = pbl_fat_load(bio, "barebox.bin", buf, len);
if (ret < 0) {
pr_err("pbl_fat_load: error %d\n", ret);
return;
}
bb = buf;
sync_caches_for_execution();
xload_bb(bb, r4);
}
static const struct sdhci_instance {
void __iomem *base;
unsigned id;
u8 periph;
s8 pins[15];
} sdhci_instances[] = {
[0] = {
.base = SAMA5D2_BASE_SDHC0, .id = SAMA5D2_ID_SDMMC0, .periph = AT91_MUX_PERIPH_A,
.pins = { 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 13, 10, 11, 12, -1 }
},
[1] = {
.base = SAMA5D2_BASE_SDHC1, .id = SAMA5D2_ID_SDMMC1, .periph = AT91_MUX_PERIPH_E,
.pins = { 18, 19, 20, 21, 22, 28, 30, -1 }
},
};
/**
* sama5d2_sdhci_start_image - Load and start an image from FAT-formatted SDHCI
* @r4: value of r4 passed by BootROM
*/
void __noreturn sama5d2_sdhci_start_image(u32 r4)
{
void *buf = (void *)SAMA5_DDRCS;
const struct sdhci_instance *instance;
struct pbl_bio bio;
const s8 *pin;
int ret;
ret = sama5_bootsource_instance(r4);
if (ret > 1)
panic("Couldn't determine boot MCI instance\n");
instance = &sdhci_instances[ret];
sama5d2_pmc_enable_periph_clock(SAMA5D2_ID_PIOA);
for (pin = instance->pins; *pin >= 0; pin++) {
at91_mux_pio4_set_periph(SAMA5D2_BASE_PIOA,
BIT(*pin), instance->periph);
}
sama5d2_pmc_enable_periph_clock(instance->id);
sama5d2_pmc_enable_generic_clock(instance->id, AT91_PMC_GCKCSS_UPLL_CLK, 1);
ret = at91_sdhci_bio_init(&bio, instance->base);
if (ret)
goto out_panic;
/* TODO: eMMC boot partition handling: they are not FAT-formatted */
at91_fat_start_image(&bio, buf, SZ_16M, r4);
out_panic:
panic("FAT chainloading failed\n");
}
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