Re: [PATCH v2 6/6] ARM: at91: sama5d3: add multiimage support for the microchip-ksz9477-evb

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello Oleksij,

On 23.04.21 16:28, Oleksij Rempel wrote:
> -ENTRY_FUNCTION(start_sama5d3_xplained_ung8071, r0, r1, r2)
> +SAMA5_ENTRY_FUNCTION(start_sama5d3_xplained_ung8071, r4)
>  {
>  	void *fdt;
>  
> -	arm_cpu_lowlevel_init();
> -
>  	arm_setup_stack(SAMA5D3_SRAM_BASE + SAMA5D3_SRAM_SIZE);

You should be able to drop this as well as the dbgu_init() after,
because first stage already did it.

>  
>  	if (IS_ENABLED(CONFIG_DEBUG_LL))
> diff --git a/arch/arm/mach-at91/include/mach/sama5d3-xplained-ddramc.h b/arch/arm/mach-at91/include/mach/sama5d3-xplained-ddramc.h
> new file mode 100644
> index 0000000000..6f829282c6
> --- /dev/null
> +++ b/arch/arm/mach-at91/include/mach/sama5d3-xplained-ddramc.h
> @@ -0,0 +1,88 @@
> +/* SPDX-License-Identifier: BSD-1-Clause
> + *
> + * Copyright (C) 2014, Atmel Corporation
> + *
> + * SAMA5D27 System-in-Package DDRAMC configuration
> + */
> +
> +#include <mach/at91_ddrsdrc.h>
> +#include <mach/ddramc.h>
> +#include <mach/sama5d3_ll.h>
> +
> +static inline void sama5d3_xplained_ddrconf(void)
> +{
> +	const struct at91_ddramc_register conf = {
> +		.mdr = AT91_DDRC2_DBW_32_BITS | AT91_DDRC2_MD_DDR2_SDRAM,
> +
> +		.cr = AT91_DDRC2_NC_DDR10_SDR9
> +			| AT91_DDRC2_NR_13
> +			| AT91_DDRC2_CAS_3
> +			| AT91_DDRC2_DISABLE_RESET_DLL
> +			| AT91_DDRC2_ENABLE_DLL
> +			| AT91_DDRC2_ENRDM_ENABLE
> +			| AT91_DDRC2_NB_BANKS_8
> +			| AT91_DDRC2_NDQS_DISABLED
> +			| AT91_DDRC2_DECOD_INTERLEAVED
> +			| AT91_DDRC2_UNAL_SUPPORTED,
> +
> +		/*
> +		 * The DDR2-SDRAM device requires a refresh every 15.625 us or 7.81 us.
> +		 * With a 133 MHz frequency, the refresh timer count register must to be
> +		 * set with (15.625 x 133 MHz) ~ 2084 i.e. 0x824
> +		 * or (7.81 x 133 MHz) ~ 1039 i.e. 0x40F.
> +		 */
> +		.rtr = 0x40F,     /* Refresh timer: 7.812us */
> +
> +		/* One clock cycle @ 133 MHz = 7.5 ns */
> +		.t0pr = AT91_DDRC2_TRAS_(6)	/* 6 * 7.5 = 45 ns */
> +			| AT91_DDRC2_TRCD_(2)	/* 2 * 7.5 = 22.5 ns */
> +			| AT91_DDRC2_TWR_(2)	/* 2 * 7.5 = 15   ns */
> +			| AT91_DDRC2_TRC_(8)	/* 8 * 7.5 = 75   ns */
> +			| AT91_DDRC2_TRP_(2)	/* 2 * 7.5 = 15   ns */
> +			| AT91_DDRC2_TRRD_(2)	/* 2 * 7.5 = 15   ns */
> +			| AT91_DDRC2_TWTR_(2)	/* 2 clock cycles min */
> +			| AT91_DDRC2_TMRD_(2),	/* 2 clock cycles */
> +
> +		.t1pr = AT91_DDRC2_TXP_(2)		/* 2 clock cycles */
> +			| AT91_DDRC2_TXSRD_(200)	/* 200 clock cycles */
> +			| AT91_DDRC2_TXSNR_(19)	/* 19 * 7.5 = 142.5 ns */
> +			| AT91_DDRC2_TRFC_(17),	/* 17 * 7.5 = 127.5 ns */
> +
> +		.t2pr = AT91_DDRC2_TFAW_(6)	/* 6 * 7.5 = 45 ns */
> +			| AT91_DDRC2_TRTP_(2)		/* 2 clock cycles min */
> +			| AT91_DDRC2_TRPA_(2)		/* 2 * 7.5 = 15 ns */
> +			| AT91_DDRC2_TXARDS_(8)	/* = TXARD */
> +			| AT91_DDRC2_TXARD_(8),	/* MR12 = 1 */
> +	};
> +	u32 reg;
> +
> +	/* enable ddr2 clock */
> +	sama5d3_pmc_enable_periph_clock(SAMA5D3_ID_MPDDRC);
> +	at91_pmc_enable_system_clock(IOMEM(SAMA5D3_BASE_PMC), AT91CAP9_PMC_DDR);
> +
> +
> +	/* Init the special register for sama5d3x */
> +	/* MPDDRC DLL Slave Offset Register: DDR2 configuration */
> +	reg = AT91_MPDDRC_S0OFF_1
> +		| AT91_MPDDRC_S2OFF_1
> +		| AT91_MPDDRC_S3OFF_1;
> +	writel(reg, SAMA5D3_BASE_MPDDRC + AT91_MPDDRC_DLL_SOR);
> +
> +	/* MPDDRC DLL Master Offset Register */
> +	/* write master + clk90 offset */
> +	reg = AT91_MPDDRC_MOFF_7
> +		| AT91_MPDDRC_CLK90OFF_31
> +		| AT91_MPDDRC_SELOFF_ENABLED | AT91_MPDDRC_KEY;
> +	writel(reg, SAMA5D3_BASE_MPDDRC + AT91_MPDDRC_DLL_MOR);
> +
> +	/* MPDDRC I/O Calibration Register */
> +	/* DDR2 RZQ = 50 Ohm */
> +	/* TZQIO = 4 */
> +	reg = AT91_MPDDRC_RDIV_DDR2_RZQ_50
> +		| AT91_MPDDRC_TZQIO_4;
> +	writel(reg, SAMA5D3_BASE_MPDDRC + AT91_MPDDRC_IO_CALIBR);
> +
> +	/* DDRAM2 Controller initialize */
> +	at91_ddram_initialize(IOMEM(SAMA5D3_BASE_MPDDRC), IOMEM(SAMA5_DDRCS),
> +			      &conf);
> +}
> diff --git a/images/Makefile.at91 b/images/Makefile.at91
> index 00fa4cab27..7c32049270 100644
> --- a/images/Makefile.at91
> +++ b/images/Makefile.at91
> @@ -14,6 +14,11 @@ pblb-$(CONFIG_MACH_MICROCHIP_KSZ9477_EVB) += start_sama5d3_xplained_ung8071
>  FILE_barebox-microchip-ksz9477-evb.img = start_sama5d3_xplained_ung8071.pblb
>  image-$(CONFIG_MACH_MICROCHIP_KSZ9477_EVB) += barebox-microchip-ksz9477-evb.img
>  
> +pblb-$(CONFIG_MACH_MICROCHIP_KSZ9477_EVB) += start_sama5d3_xplained_ung8071_xload_mmc
> +MAX_PBL_IMAGE_SIZE_start_sama5d3_xplained_ung8071_xload_mmc = 0xffff
> +FILE_barebox-microchip-ksz9477-evb-xload-mmc.img = start_sama5d3_xplained_ung8071_xload_mmc.pblb
> +image-$(CONFIG_MACH_MICROCHIP_KSZ9477_EVB) += barebox-microchip-ksz9477-evb-xload-mmc.img
> +
>  pblb-$(CONFIG_MACH_SAMA5D27_SOM1) += start_sama5d27_som1_ek
>  FILE_barebox-sama5d27-som1-ek.img = start_sama5d27_som1_ek.pblb
>  image-$(CONFIG_MACH_SAMA5D27_SOM1) += barebox-sama5d27-som1-ek.img
> 

-- 
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