From c721c22a031f59729bd3d53fd52739c87c561368 Mon Sep 17 00:00:00 2001 From: Eugen Hristev Date: Thu, 8 Aug 2019 07:48:35 +0000 Subject: board: atmel: sama5d2_wlsom1_ek: add SPL support Add support for SPL for this board: DRAM initialization, PMC initialization, MMC boot. Signed-off-by: Eugen Hristev --- .../atmel/sama5d27_wlsom1_ek/sama5d27_wlsom1_ek.c | 147 +++++++++++++++++++++ 1 file changed, 147 insertions(+) (limited to 'board') diff --git a/board/atmel/sama5d27_wlsom1_ek/sama5d27_wlsom1_ek.c b/board/atmel/sama5d27_wlsom1_ek/sama5d27_wlsom1_ek.c index 483ec82900..3663ae4a7a 100644 --- a/board/atmel/sama5d27_wlsom1_ek/sama5d27_wlsom1_ek.c +++ b/board/atmel/sama5d27_wlsom1_ek/sama5d27_wlsom1_ek.c @@ -78,3 +78,150 @@ int dram_init(void) CONFIG_SYS_SDRAM_SIZE); return 0; } + +/* SPL */ +#ifdef CONFIG_SPL_BUILD + +#ifdef CONFIG_SD_BOOT +void spl_mmc_init(void) +{ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 1, 0); /* CMD */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 2, 0); /* DAT0 */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 3, 0); /* DAT1 */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 4, 0); /* DAT2 */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 5, 0); /* DAT3 */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 0, 0); /* CK */ + atmel_pio4_set_a_periph(AT91_PIO_PORTA, 13, 0); /* CD */ + + at91_periph_clk_enable(ATMEL_ID_SDMMC0); +} +#endif + +void spl_board_init(void) +{ +#ifdef CONFIG_SD_BOOT + spl_mmc_init(); +#endif +} + +void spl_display_print(void) +{ +} + +static void ddrc_conf(struct atmel_mpddrc_config *ddrc) +{ + ddrc->md = (ATMEL_MPDDRC_MD_DBW_32_BITS | ATMEL_MPDDRC_MD_LPDDR2_SDRAM); + + ddrc->cr = (ATMEL_MPDDRC_CR_NC_COL_9 | + ATMEL_MPDDRC_CR_NR_ROW_14 | + ATMEL_MPDDRC_CR_CAS_DDR_CAS3 | + ATMEL_MPDDRC_CR_ZQ_SHORT | + ATMEL_MPDDRC_CR_NB_8BANKS | + ATMEL_MPDDRC_CR_DECOD_INTERLEAVED | + ATMEL_MPDDRC_CR_UNAL_SUPPORTED); + + ddrc->lpddr23_lpr = ATMEL_MPDDRC_LPDDR23_LPR_DS(0x3); + + /* + * The AD220032D average time between REFRESH commands (Trefi): 3.9us + * 3.9us * 164MHz = 639.6 = 0x27F. + */ + ddrc->rtr = 0x27f; + /* Enable Adjust Refresh Rate */ + ddrc->rtr |= ATMEL_MPDDRC_RTR_ADJ_REF; + + ddrc->tpr0 = ((7 << ATMEL_MPDDRC_TPR0_TRAS_OFFSET) | + (3 << ATMEL_MPDDRC_TPR0_TRCD_OFFSET) | + (4 << ATMEL_MPDDRC_TPR0_TWR_OFFSET) | + (11 << ATMEL_MPDDRC_TPR0_TRC_OFFSET) | + (4 << ATMEL_MPDDRC_TPR0_TRP_OFFSET) | + (2 << ATMEL_MPDDRC_TPR0_TRRD_OFFSET) | + (2 << ATMEL_MPDDRC_TPR0_TWTR_OFFSET) | + (5 << ATMEL_MPDDRC_TPR0_TMRD_OFFSET)); + + ddrc->tpr1 = ((21 << ATMEL_MPDDRC_TPR1_TRFC_OFFSET) | + (0 << ATMEL_MPDDRC_TPR1_TXSNR_OFFSET) | + (23 << ATMEL_MPDDRC_TPR1_TXSRD_OFFSET) | + (2 << ATMEL_MPDDRC_TPR1_TXP_OFFSET)); + + ddrc->tpr2 = ((0 << ATMEL_MPDDRC_TPR2_TXARD_OFFSET) | + (0 << ATMEL_MPDDRC_TPR2_TXARDS_OFFSET) | + (4 << ATMEL_MPDDRC_TPR2_TRPA_OFFSET) | + (2 << ATMEL_MPDDRC_TPR2_TRTP_OFFSET) | + (10 << ATMEL_MPDDRC_TPR2_TFAW_OFFSET)); + + ddrc->tim_cal = ATMEL_MPDDRC_CALR_ZQCS(15); + + /* + * According to the sama5d2 datasheet and the following values: + * T Sens = 0.75%/C, V Sens = 0.2%/mV, T driftrate = 1C/sec and V driftrate = 15 mV/s + * Warning: note that the values T driftrate and V driftrate are dependent on + * the application environment. + * ZQCS period is 1.5 / ((0.75 x 1) + (0.2 x 15)) = 0.4s + * If Trefi is 3.9us, we have: 400000 / 3.9 = 102564: we can maximize + * this timer to 0xFFFE. + */ + ddrc->cal_mr4 = ATMEL_MPDDRC_CAL_MR4_COUNT_CAL(0xFFFE); + + /* + * MR4 Read interval is dependent on the application environment. + * Here, we want to maximize this value as temperature is supposed + * to vary slowly in the application chosen. + * If Trefi is 3.9us, we have: + * (0xFFFE) 65534 x 3.9 = 0.25s between MR4 reads. + */ + ddrc->cal_mr4 |= ATMEL_MPDDRC_CAL_MR4_MR4R(0xFFFE); +} + +void mem_init(void) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + struct atmel_mpddr *mpddrc = (struct atmel_mpddr *)ATMEL_BASE_MPDDRC; + struct atmel_mpddrc_config ddrc_config; + u32 reg; + + at91_periph_clk_enable(ATMEL_ID_MPDDRC); + writel(AT91_PMC_DDR, &pmc->scer); + + ddrc_conf(&ddrc_config); + + reg = readl(&mpddrc->io_calibr); + reg &= ~ATMEL_MPDDRC_IO_CALIBR_RDIV; + reg |= ATMEL_MPDDRC_IO_CALIBR_LPDDR2_RZQ_48; + reg &= ~ATMEL_MPDDRC_IO_CALIBR_TZQIO; + reg |= ATMEL_MPDDRC_IO_CALIBR_TZQIO_(100); + writel(reg, &mpddrc->io_calibr); + + writel(ATMEL_MPDDRC_RD_DATA_PATH_SHIFT_ONE_CYCLE, + &mpddrc->rd_data_path); + + lpddr2_init(ATMEL_BASE_MPDDRC, ATMEL_BASE_DDRCS, &ddrc_config); +} + +void at91_pmc_init(void) +{ + u32 tmp; + + /* + * while coming from the ROM code, we run on PLLA @ 492 MHz / 164 MHz + * so we need to slow down and configure MCKR accordingly. + * This is why we have a special flavor of the switching function. + */ + tmp = AT91_PMC_MCKR_PLLADIV_2 | + AT91_PMC_MCKR_MDIV_3 | + AT91_PMC_MCKR_CSS_MAIN; + at91_mck_init_down(tmp); + + tmp = AT91_PMC_PLLAR_29 | + AT91_PMC_PLLXR_PLLCOUNT(0x3f) | + AT91_PMC_PLLXR_MUL(40) | + AT91_PMC_PLLXR_DIV(1); + at91_plla_init(tmp); + + tmp = AT91_PMC_MCKR_H32MXDIV | + AT91_PMC_MCKR_PLLADIV_2 | + AT91_PMC_MCKR_MDIV_3 | + AT91_PMC_MCKR_CSS_PLLA; + at91_mck_init(tmp); +} +#endif -- cgit v1.2.3