Provide sun50i_mmc0_start_image helper that can be called from PBL to to easily initialize mmc0 controller and chainload a barebox.bin file from the first FAT partition. Signed-off-by: Jules Maselbas <jmaselbas@xxxxxxxx> --- arch/arm/mach-sunxi/Makefile | 1 + arch/arm/mach-sunxi/xload-mmc.c | 67 +++++++++++++++++++++++++++++++++ include/mach/sunxi/xload.h | 2 + 3 files changed, 70 insertions(+) create mode 100644 arch/arm/mach-sunxi/xload-mmc.c diff --git a/arch/arm/mach-sunxi/Makefile b/arch/arm/mach-sunxi/Makefile index 0808a21605..fd38462477 100644 --- a/arch/arm/mach-sunxi/Makefile +++ b/arch/arm/mach-sunxi/Makefile @@ -2,3 +2,4 @@ obj-y += sunxi.o lwl-y += cpu_init.o lwl-y += sun50i-a64-ddr3-init.o lwl-y += sun50i-a64-lpddr3-init.o +pbl-y += xload-mmc.o diff --git a/arch/arm/mach-sunxi/xload-mmc.c b/arch/arm/mach-sunxi/xload-mmc.c new file mode 100644 index 0000000000..9b2d81148e --- /dev/null +++ b/arch/arm/mach-sunxi/xload-mmc.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <common.h> +#include <asm/cache.h> +#include <linux/bitops.h> +#include <mach/sunxi/sun50i-regs.h> +#include <mach/sunxi/sunxi-pinctrl.h> +#include <mach/sunxi/xload.h> + +static void sun50i_mmc0_init(void) +{ + void __iomem *ccu = SUN50I_CCU_BASE_ADDR; + void __iomem *pio = SUN50I_PIO_BASE_ADDR; + + /* - clock un-gate pinctrl controller */ + setbits_le32(ccu + CCU_BUS_CLK_GATE2, BIT(5)); + /* - set mmc alt-function (2) for pins PF5 to PF0 */ + sunxi_pinmux_set_func(pio, PIO_PF_CFG0, GENMASK(5, 0), 2); + + /* - clock un-gate mmc controller and release reset */ + setbits_le32(ccu + 0x2c0, /* RST_BUS_MMC0 */ BIT(8)); + setbits_le32(ccu + 0x060, /* CLK_BUS_MMC0 */ BIT(8)); + writel(BIT(31), ccu + 0x88); /* MMC0 clock gate */ +} + +#if 0 /* currently unused */ +static void sun50i_mmc2_init(void) +{ + void __iomem *ccu = SUN50I_CCU_BASE_ADDR; + void __iomem *pio = SUN50I_PIO_BASE_ADDR; + + /* - clock un-gate pinctrl controller */ + setbits_le32(ccu + CCU_BUS_CLK_GATE2, BIT(5)); + /* - set mmc alt-function (3) for pins PC16 to PC5 */ + sunxi_pinmux_set_func(pio, PIO_PC_BASE, GENMASK(16, 5), 3); + + /* - clock un-gate mmc controller and release reset */ + setbits_le32(ccu + 0x2c0, /* RST_BUS_MMC2 */ BIT(10)); + setbits_le32(ccu + 0x060, /* CLK_BUS_MMC2 */ BIT(10)); + writel(BIT(31), ccu + 0x90); /* MMC2 clock gate */ +} +#endif + +static void sunxi_fat_start_image(struct pbl_bio *bio, void *buf, size_t size) +{ + void (*start)(void) = buf; + int ret; + + ret = pbl_fat_load(bio, "barebox.bin", buf, size); + if (ret < 0) + return; + sync_caches_for_execution(); + start(); +} + +void sun50i_mmc0_start_image(void) +{ + struct pbl_bio bio; + int ret; + + sun50i_mmc0_init(); + + ret = sunxi_mmc_bio_init(&bio, SUN50I_MMC0_BASE_ADDR, 24000000, 0); + if (ret) + return; + sunxi_fat_start_image(&bio, IOMEM(SUN50I_DRAM_ADDR), SZ_16M); +} diff --git a/include/mach/sunxi/xload.h b/include/mach/sunxi/xload.h index f978db4951..005f78b5c5 100644 --- a/include/mach/sunxi/xload.h +++ b/include/mach/sunxi/xload.h @@ -9,4 +9,6 @@ int sunxi_mmc_bio_init(struct pbl_bio *bio, void __iomem *base, unsigned int clock, unsigned int slot); +void sun50i_mmc0_start_image(void); + #endif -- 2.40.1