[PATCH v2 06/11] ARM: at91: Add at91sam9 xload_mmc for PBL use

Ahmad Fatoum a.fatoum at pengutronix.de
Tue Jun 28 23:50:02 PDT 2022 

On 28.06.22 22:38, Sam Ravnborg wrote:
> Add xload support to at91sam9263 similar to what is already
> present for the sama5d3.
> The xload supports reading barebox.bin from a SDCARD from the
> PBL and load the full barebox.bin and starts it.

Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

> 
> Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
> ---
>  arch/arm/mach-at91/Makefile             |   1 +
>  arch/arm/mach-at91/at91sam9_xload_mmc.c | 118 ++++++++++++++++++++++++
>  arch/arm/mach-at91/include/mach/xload.h |   4 +
>  3 files changed, 123 insertions(+)
>  create mode 100644 arch/arm/mach-at91/at91sam9_xload_mmc.c
> 
> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
> index 12e64291b..b171d682f 100644
> --- a/arch/arm/mach-at91/Makefile
> +++ b/arch/arm/mach-at91/Makefile
> @@ -17,6 +17,7 @@ obj-y += at91sam9_reset.o
>  obj-y += at91sam9g45_reset.o
>  obj-pbl-$(CONFIG_HAVE_AT91_DDRAMC) += ddramc.o
>  pbl-$(CONFIG_AT91_MCI_PBL) +=  xload-mmc.o
> +pbl-$(CONFIG_AT91_MCI_PBL) +=  at91sam9_xload_mmc.o
>  
>  obj-$(CONFIG_AT91SAM9_SMC) += sam9_smc.o
>  obj-$(CONFIG_HAVE_AT91SAM9_RST) += at91sam9_rst.o
> diff --git a/arch/arm/mach-at91/at91sam9_xload_mmc.c b/arch/arm/mach-at91/at91sam9_xload_mmc.c
> new file mode 100644
> index 000000000..64266757d
> --- /dev/null
> +++ b/arch/arm/mach-at91/at91sam9_xload_mmc.c
> @@ -0,0 +1,118 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* SPDX-FileCopyrightText: 2022 Sam Ravnborg */
> +
> +#include <debug_ll.h>
> +#include <common.h>
> +#include <pbl.h>
> +
> +#include <linux/sizes.h>
> +#include <asm/cache.h>
> +
> +#include <mach/at91_pmc_ll.h>
> +#include <mach/at91sam9263.h>
> +#include <mach/at91sam926x.h>
> +#include <mach/hardware.h>
> +#include <mach/iomux.h>
> +#include <mach/xload.h>
> +#include <mach/gpio.h>
> +
> +typedef void (*func)(int zero, int arch, void *params);
> +
> +/*
> + * Load barebox.bin and start executing the first byte in the barebox image.
> + * barebox.bin is loaded to AT91_CHIPSELECT_1.
> + *
> + * To be able to load barebox.bin do a minimal init of the pheriferals
> + * used by MCI.
> + * This functions runs in PBL code and uses the PBL variant of the
> + * atmel_mci driver.
> + */
> +void __noreturn sam9263_atmci_start_image(u32 mmc_id, unsigned int clock,
> +					  bool slot_b)
> +{
> +	void __iomem *pio = IOMEM(AT91SAM9263_BASE_PIOA);
> +	void *buf = (void *)AT91_CHIPSELECT_1;
> +	void __iomem *base;
> +	struct pbl_bio bio;
> +	int ret;
> +
> +	at91_pmc_enable_periph_clock(IOMEM(AT91SAM926X_BASE_PMC), AT91SAM9263_ID_PIOA);
> +
> +	if (mmc_id == 0) {
> +		base = IOMEM(AT91SAM9263_BASE_MCI0);
> +
> +		/* CLK */
> +		at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA12), AT91_MUX_PERIPH_A, 0);
> +
> +		if (!slot_b) {
> +			/* CMD */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA1), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +
> +			/* DAT0 to DAT3 */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA0), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA3), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA4), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA5), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +		} else {
> +			/* CMD */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA16), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +
> +			/* DAT0 to DAT3 */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA17), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA18), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA19), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA20), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +		}
> +
> +		at91_pmc_enable_periph_clock(IOMEM(AT91SAM926X_BASE_PMC),  AT91SAM9263_ID_MCI0);
> +	} else {
> +		base = IOMEM(AT91SAM9263_BASE_MCI1);
> +
> +		/* CLK */
> +		at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA6), AT91_MUX_PERIPH_A, 0);
> +
> +		if (!slot_b) {
> +			/* CMD */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA7), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +
> +			/* DAT0 to DAT3 */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA8), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA9), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA10), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA11), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +		} else {
> +			/* CMD */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA21), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +
> +			/* DAT0 to DAT3 */
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA22), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA23), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA24), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +			at91_mux_pio_pin(pio, pin_to_mask(AT91_PIN_PA25), AT91_MUX_PERIPH_A, GPIO_PULL_UP);
> +		}
> +
> +		at91_pmc_enable_periph_clock(IOMEM(AT91SAM926X_BASE_PMC),  AT91SAM9263_ID_MCI1);
> +	}
> +
> +	ret = at91_mci_bio_init(&bio, base, clock, (int)slot_b);
> +	if (ret) {
> +		pr_err("atmci_start_image: bio init faild: %d\n", ret);
> +		goto out_panic;
> +	}
> +
> +	/* at91sam9x do not support high capacity */
> +	at91_mci_bio_set_highcapacity(false);
> +
> +	ret = pbl_fat_load(&bio, "barebox.bin", buf, SZ_16M);
> +	if (ret < 0) {
> +		pr_err("pbl_fat_load: error %d\n", ret);
> +		goto out_panic;
> +	}
> +
> +	sync_caches_for_execution();
> +
> +	((func)buf)(0, 0, NULL);
> +
> +out_panic:
> +	panic("FAT chainloading failed\n");
> +}
> diff --git a/arch/arm/mach-at91/include/mach/xload.h b/arch/arm/mach-at91/include/mach/xload.h
> index 488279c1a..82db65e30 100644
> --- a/arch/arm/mach-at91/include/mach/xload.h
> +++ b/arch/arm/mach-at91/include/mach/xload.h
> @@ -15,4 +15,8 @@ int at91_mci_bio_init(struct pbl_bio *bio, void __iomem *base,
>  		      unsigned int clock, unsigned int slot);
>  void at91_mci_bio_set_highcapacity(bool highcapacity_card);
>  
> +void __noreturn sam9263_atmci_start_image(u32 mmc_id, unsigned int clock,
> +					  bool slot_b);
> +
> +
>  #endif /* __MACH_XLOAD_H */


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