1 files changed, 137 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/xload-mmc.c b/arch/arm/mach-at91/xload-mmc.c
new file mode 100644
index 0000000000..9c03d2119c
--- /dev/null
+++ b/arch/arm/mach-at91/xload-mmc.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <mach/at91/xload.h>
+#include <mach/at91/sama5_bootsource.h>
+#include <mach/at91/hardware.h>
+#include <mach/at91/sama5d2_ll.h>
+#include <mach/at91/sama5d3_ll.h>
+#include <mach/at91/gpio.h>
+#include <linux/sizes.h>
+#include <asm/cache.h>
+#include <pbl/bio.h>
+
+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();
+
+	sama5_boot_xload(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");
+}
+
+static const struct atmci_instance {
+	void __iomem *base;
+	unsigned id;
+	u8 periph;
+	s8 pins[15];
+} sama5d3_atmci_instances[] = {
+	[0] = {
+		.base = IOMEM(SAMA5D3_BASE_HSMCI0),
+		.id = SAMA5D3_ID_HSMCI0,
+		.periph = AT91_MUX_PERIPH_A,
+		.pins = {
+			AT91_PIN_PD0, AT91_PIN_PD1, AT91_PIN_PD2, AT91_PIN_PD3,
+			AT91_PIN_PD4, AT91_PIN_PD5, AT91_PIN_PD6, AT91_PIN_PD7,
+			AT91_PIN_PD8, AT91_PIN_PD9, -1 }
+	},
+};
+
+void __noreturn sama5d3_atmci_start_image(u32 boot_src, unsigned int clock,
+					  unsigned int slot)
+{
+	void *buf = (void *)SAMA5_DDRCS;
+	const struct atmci_instance *instance;
+	struct pbl_bio bio;
+	const s8 *pin;
+	int ret;
+
+	ret = sama5_bootsource_instance(boot_src);
+	if (ret > ARRAY_SIZE(sama5d3_atmci_instances) - 1)
+		panic("Couldn't determine boot MCI instance\n");
+
+	instance = &sama5d3_atmci_instances[boot_src];
+
+	sama5d3_pmc_enable_periph_clock(SAMA5D3_ID_PIOD);
+	for (pin = instance->pins; *pin >= 0; pin++) {
+		at91_mux_pio3_pin(IOMEM(SAMA5D3_BASE_PIOD),
+					 pin_to_mask(*pin), instance->periph, 0);
+	}
+
+	sama5d3_pmc_enable_periph_clock(instance->id);
+
+	ret = at91_mci_bio_init(&bio, instance->base, clock, slot);
+	if (ret)
+		goto out_panic;
+
+	at91_fat_start_image(&bio, buf, SZ_16M, boot_src);
+
+out_panic:
+	panic("FAT chainloading failed\n");
+}