We have had a separate am335x_mlo_defconfig for a long time, but it frequently breaks, because barebox keeps getting bigger and then is slimmed down a bit again.
To counteract that, there is a am335x_mlo_sdmmc_defconfig, but the downside is that this still requires two barebox builds: One for MLO and one for barebox proper, because the MLO needs to fit into the on-chip SRAM. Reworking drivers for all supported boot media, including raw flash, to be usable in PBL is a big undertaking, but supporting just SD is easy enough, so add an entry point exclusively for that. The end goal is to allow an easier integration for a future beaglebone-yocto support in openembedded-core. Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de> --- arch/arm/mach-omap/Makefile | 1 + arch/arm/mach-omap/am33xx_generic.c | 38 ++++++++--------- arch/arm/mach-omap/am33xx_xload.c | 66 +++++++++++++++++++++++++++++ include/mach/omap/am33xx-generic.h | 2 + include/mach/omap/xload.h | 14 ++++++ 5 files changed, 102 insertions(+), 19 deletions(-) create mode 100644 arch/arm/mach-omap/am33xx_xload.c create mode 100644 include/mach/omap/xload.h diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile index 6b42196b2373..83722dfa9ca1 100644 --- a/arch/arm/mach-omap/Makefile +++ b/arch/arm/mach-omap/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_ARCH_OMAP3) += omap3_generic.o auxcr.o pbl-$(CONFIG_ARCH_OMAP3) += omap3_generic.o auxcr.o obj-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o pbl-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o +pbl-$(CONFIG_MCI_OMAP_HSMMC_PBL) += am33xx_xload.o obj-pbl-$(CONFIG_ARCH_AM33XX) += am33xx_generic.o am33xx_clock.o am33xx_mux.o am3xxx.o emif4.o obj-pbl-$(CONFIG_ARCH_AM35XX) += am3xxx.o emif4.o obj-$(CONFIG_ARCH_AM33XX) += am33xx_scrm.o diff --git a/arch/arm/mach-omap/am33xx_generic.c b/arch/arm/mach-omap/am33xx_generic.c index bcafc0677e38..007daccdfbe1 100644 --- a/arch/arm/mach-omap/am33xx_generic.c +++ b/arch/arm/mach-omap/am33xx_generic.c @@ -120,40 +120,40 @@ u32 am33xx_running_in_sdram(void) return 0; /* running in SRAM or FLASH */ } -static int am33xx_bootsource(void) +enum bootsource am33xx_get_bootsource(int *instance) { - enum bootsource src; - int instance = 0; uint32_t *am33xx_bootinfo = (void *)AM33XX_SRAM_SCRATCH_SPACE; switch (am33xx_bootinfo[2] & 0xFF) { case 0x05: - src = BOOTSOURCE_NAND; - break; + return BOOTSOURCE_NAND; case 0x08: - src = BOOTSOURCE_MMC; instance = 0; - break; + return BOOTSOURCE_MMC; case 0x09: - src = BOOTSOURCE_MMC; - instance = 1; - break; + *instance = 1; + return BOOTSOURCE_MMC; case 0x0b: - src = BOOTSOURCE_SPI; - break; + return BOOTSOURCE_SPI; case 0x41: - src = BOOTSOURCE_SERIAL; - break; + return BOOTSOURCE_SERIAL; case 0x44: - src = BOOTSOURCE_USB; - break; + return BOOTSOURCE_USB; case 0x46: - src = BOOTSOURCE_NET; - break; + return BOOTSOURCE_NET; default: - src = BOOTSOURCE_UNKNOWN; + return BOOTSOURCE_UNKNOWN; } +} + +static int am33xx_bootsource(void) +{ + enum bootsource src; + int instance = 0; + + src = am33xx_get_bootsource(&instance); bootsource_set_raw(src, instance); + return 0; } diff --git a/arch/arm/mach-omap/am33xx_xload.c b/arch/arm/mach-omap/am33xx_xload.c new file mode 100644 index 000000000000..f0c8b451b308 --- /dev/null +++ b/arch/arm/mach-omap/am33xx_xload.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <common.h> +#include <filetype.h> +#include <mach/omap/generic.h> +#include <mach/omap/xload.h> +#include <mach/omap/am33xx-silicon.h> +#include <mach/omap/am33xx-generic.h> +#include <mach/omap/am33xx-clock.h> +#include <bootsource.h> +#include <linux/sizes.h> +#include <asm/cache.h> +#include <pbl/bio.h> + +struct xload_instance { + void __iomem *base; +}; + +static void omap_hsmmc_fat_start_image(struct pbl_bio *bio, void *buf) +{ + int ret; + + ret = pbl_fat_load(bio, "barebox.bin", buf, SZ_2M); + if (ret < 0) { + pr_err("pbl_fat_load: error %d\n", ret); + return; + } + + sync_caches_for_execution(); + + asm volatile ("bx %0\n" : : "r"(buf) :); + __builtin_unreachable(); +} + +static const struct xload_instance am35xx_hsmmc_instances[] = { + [0] = { .base = IOMEM(AM33XX_MMCHS0_BASE), }, + [1] = { .base = IOMEM(AM33XX_MMC1_BASE), }, + [2] = { .base = IOMEM(AM33XX_MMCHS2_BASE), }, +}; + +void __noreturn am33xx_hsmmc_start_image(void) +{ + void *buf = (void *)OMAP_DRAM_ADDR_SPACE_START; + const struct xload_instance *instance; + enum bootsource src; + struct pbl_bio bio; + int id = 0, ret; + + omap_dmtimer_init(IOMEM(AM33XX_DMTIMER0_BASE), + am33xx_get_osc_clock() * 1000); + + src = am33xx_get_bootsource(&id); + if (src != BOOTSOURCE_MMC) + panic("This MLO was configured only for SD/MMC\n"); + + instance = &am35xx_hsmmc_instances[id]; + + ret = omap_hsmmc_bio_init(&bio, instance->base, 0x100); + if (ret) + goto out_panic; + + omap_hsmmc_fat_start_image(&bio, buf); + +out_panic: + panic("FAT chainloading failed\n"); +} diff --git a/include/mach/omap/am33xx-generic.h b/include/mach/omap/am33xx-generic.h index 30aa13974111..a1ede96a30ff 100644 --- a/include/mach/omap/am33xx-generic.h +++ b/include/mach/omap/am33xx-generic.h @@ -30,6 +30,8 @@ u32 am33xx_running_in_flash(void); u32 am33xx_running_in_sram(void); u32 am33xx_running_in_sdram(void); +enum bootsource am33xx_get_bootsource(int *instance); + void am33xx_enable_per_clocks(void); int am33xx_init(void); int am33xx_devices_init(void); diff --git a/include/mach/omap/xload.h b/include/mach/omap/xload.h new file mode 100644 index 000000000000..d820d2602c22 --- /dev/null +++ b/include/mach/omap/xload.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __MACH_OMAP_XLOAD_H +#define __MACH_OMAP_XLOAD_H + +#include <linux/compiler.h> +#include <pbl/bio.h> + +void __noreturn am33xx_hsmmc_start_image(void); + +int omap_hsmmc_bio_init(struct pbl_bio *bio, void __iomem *base, + unsigned reg_ofs); + +#endif /* __MACH_OMAP_XLOAD_H */ -- 2.39.5