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https://github.com/AsahiLinux/u-boot
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246a5e5fc2
- adds reading FMC swap setting from DTB to SDRAM driver - sets FMC swap for stm32f429-disco board - changes ram start address to 0x90000000 Signed-off-by: Radoslaw Pietrzyk <radoslaw.pietrzyk@gmail.com> Acked-by: Patrice Chotard <patrice.chotard@st.com>
408 lines
11 KiB
C
408 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <ram.h>
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#include <asm/io.h>
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#define MEM_MODE_MASK GENMASK(2, 0)
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#define SWP_FMC_OFFSET 10
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#define SWP_FMC_MASK GENMASK(SWP_FMC_OFFSET+1, SWP_FMC_OFFSET)
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#define NOT_FOUND 0xff
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struct stm32_fmc_regs {
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/* 0x0 */
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u32 bcr1; /* NOR/PSRAM Chip select control register 1 */
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u32 btr1; /* SRAM/NOR-Flash Chip select timing register 1 */
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u32 bcr2; /* NOR/PSRAM Chip select Control register 2 */
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u32 btr2; /* SRAM/NOR-Flash Chip select timing register 2 */
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u32 bcr3; /* NOR/PSRAMChip select Control register 3 */
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u32 btr3; /* SRAM/NOR-Flash Chip select timing register 3 */
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u32 bcr4; /* NOR/PSRAM Chip select Control register 4 */
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u32 btr4; /* SRAM/NOR-Flash Chip select timing register 4 */
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u32 reserved1[24];
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/* 0x80 */
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u32 pcr; /* NAND Flash control register */
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u32 sr; /* FIFO status and interrupt register */
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u32 pmem; /* Common memory space timing register */
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u32 patt; /* Attribute memory space timing registers */
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u32 reserved2[1];
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u32 eccr; /* ECC result registers */
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u32 reserved3[27];
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/* 0x104 */
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u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */
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u32 reserved4[1];
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u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */
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u32 reserved5[1];
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u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */
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u32 reserved6[1];
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u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */
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u32 reserved7[8];
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/* 0x140 */
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u32 sdcr1; /* SDRAM Control register 1 */
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u32 sdcr2; /* SDRAM Control register 2 */
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u32 sdtr1; /* SDRAM Timing register 1 */
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u32 sdtr2; /* SDRAM Timing register 2 */
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u32 sdcmr; /* SDRAM Mode register */
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u32 sdrtr; /* SDRAM Refresh timing register */
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u32 sdsr; /* SDRAM Status register */
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};
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/*
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* NOR/PSRAM Control register BCR1
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* FMC controller Enable, only availabe for H7
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*/
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#define FMC_BCR1_FMCEN BIT(31)
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/* Control register SDCR */
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#define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */
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#define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */
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#define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */
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#define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */
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#define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */
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#define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */
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#define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */
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#define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */
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#define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */
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/* Timings register SDTR */
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#define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */
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#define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */
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#define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */
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#define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */
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#define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */
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#define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */
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#define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */
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#define FMC_SDCMR_NRFS_SHIFT 5
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#define FMC_SDCMR_MODE_NORMAL 0
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#define FMC_SDCMR_MODE_START_CLOCK 1
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#define FMC_SDCMR_MODE_PRECHARGE 2
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#define FMC_SDCMR_MODE_AUTOREFRESH 3
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#define FMC_SDCMR_MODE_WRITE_MODE 4
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#define FMC_SDCMR_MODE_SELFREFRESH 5
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#define FMC_SDCMR_MODE_POWERDOWN 6
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#define FMC_SDCMR_BANK_1 BIT(4)
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#define FMC_SDCMR_BANK_2 BIT(3)
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#define FMC_SDCMR_MODE_REGISTER_SHIFT 9
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#define FMC_SDSR_BUSY BIT(5)
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#define FMC_BUSY_WAIT(regs) do { \
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__asm__ __volatile__ ("dsb" : : : "memory"); \
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while (regs->sdsr & FMC_SDSR_BUSY) \
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; \
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} while (0)
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struct stm32_sdram_control {
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u8 no_columns;
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u8 no_rows;
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u8 memory_width;
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u8 no_banks;
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u8 cas_latency;
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u8 sdclk;
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u8 rd_burst;
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u8 rd_pipe_delay;
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};
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struct stm32_sdram_timing {
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u8 tmrd;
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u8 txsr;
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u8 tras;
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u8 trc;
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u8 trp;
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u8 twr;
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u8 trcd;
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};
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enum stm32_fmc_bank {
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SDRAM_BANK1,
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SDRAM_BANK2,
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MAX_SDRAM_BANK,
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};
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enum stm32_fmc_family {
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STM32F7_FMC,
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STM32H7_FMC,
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};
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struct bank_params {
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struct stm32_sdram_control *sdram_control;
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struct stm32_sdram_timing *sdram_timing;
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u32 sdram_ref_count;
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enum stm32_fmc_bank target_bank;
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};
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struct stm32_sdram_params {
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struct stm32_fmc_regs *base;
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u8 no_sdram_banks;
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struct bank_params bank_params[MAX_SDRAM_BANK];
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enum stm32_fmc_family family;
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};
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#define SDRAM_MODE_BL_SHIFT 0
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#define SDRAM_MODE_CAS_SHIFT 4
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#define SDRAM_MODE_BL 0
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int stm32_sdram_init(struct udevice *dev)
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{
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struct stm32_sdram_params *params = dev_get_platdata(dev);
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struct stm32_sdram_control *control;
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struct stm32_sdram_timing *timing;
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struct stm32_fmc_regs *regs = params->base;
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enum stm32_fmc_bank target_bank;
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u32 ctb; /* SDCMR register: Command Target Bank */
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u32 ref_count;
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u8 i;
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/* disable the FMC controller */
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if (params->family == STM32H7_FMC)
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clrbits_le32(®s->bcr1, FMC_BCR1_FMCEN);
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for (i = 0; i < params->no_sdram_banks; i++) {
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control = params->bank_params[i].sdram_control;
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timing = params->bank_params[i].sdram_timing;
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target_bank = params->bank_params[i].target_bank;
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ref_count = params->bank_params[i].sdram_ref_count;
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writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT
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| control->cas_latency << FMC_SDCR_CAS_SHIFT
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| control->no_banks << FMC_SDCR_NB_SHIFT
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| control->memory_width << FMC_SDCR_MWID_SHIFT
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| control->no_rows << FMC_SDCR_NR_SHIFT
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| control->no_columns << FMC_SDCR_NC_SHIFT
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| control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT
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| control->rd_burst << FMC_SDCR_RBURST_SHIFT,
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®s->sdcr1);
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if (target_bank == SDRAM_BANK2)
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writel(control->cas_latency << FMC_SDCR_CAS_SHIFT
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| control->no_banks << FMC_SDCR_NB_SHIFT
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| control->memory_width << FMC_SDCR_MWID_SHIFT
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| control->no_rows << FMC_SDCR_NR_SHIFT
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| control->no_columns << FMC_SDCR_NC_SHIFT,
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®s->sdcr2);
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writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
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| timing->trp << FMC_SDTR_TRP_SHIFT
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| timing->twr << FMC_SDTR_TWR_SHIFT
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| timing->trc << FMC_SDTR_TRC_SHIFT
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| timing->tras << FMC_SDTR_TRAS_SHIFT
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| timing->txsr << FMC_SDTR_TXSR_SHIFT
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| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
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®s->sdtr1);
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if (target_bank == SDRAM_BANK2)
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writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
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| timing->trp << FMC_SDTR_TRP_SHIFT
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| timing->twr << FMC_SDTR_TWR_SHIFT
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| timing->trc << FMC_SDTR_TRC_SHIFT
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| timing->tras << FMC_SDTR_TRAS_SHIFT
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| timing->txsr << FMC_SDTR_TXSR_SHIFT
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| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
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®s->sdtr2);
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if (target_bank == SDRAM_BANK1)
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ctb = FMC_SDCMR_BANK_1;
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else
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ctb = FMC_SDCMR_BANK_2;
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writel(ctb | FMC_SDCMR_MODE_START_CLOCK, ®s->sdcmr);
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udelay(200); /* 200 us delay, page 10, "Power-Up" */
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FMC_BUSY_WAIT(regs);
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writel(ctb | FMC_SDCMR_MODE_PRECHARGE, ®s->sdcmr);
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udelay(100);
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FMC_BUSY_WAIT(regs);
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writel((ctb | FMC_SDCMR_MODE_AUTOREFRESH | 7 << FMC_SDCMR_NRFS_SHIFT),
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®s->sdcmr);
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udelay(100);
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FMC_BUSY_WAIT(regs);
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writel(ctb | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
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| control->cas_latency << SDRAM_MODE_CAS_SHIFT)
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<< FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
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®s->sdcmr);
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udelay(100);
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FMC_BUSY_WAIT(regs);
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writel(ctb | FMC_SDCMR_MODE_NORMAL, ®s->sdcmr);
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FMC_BUSY_WAIT(regs);
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/* Refresh timer */
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writel(ref_count << 1, ®s->sdrtr);
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}
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/* enable the FMC controller */
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if (params->family == STM32H7_FMC)
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setbits_le32(®s->bcr1, FMC_BCR1_FMCEN);
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return 0;
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}
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static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
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{
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struct stm32_sdram_params *params = dev_get_platdata(dev);
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struct bank_params *bank_params;
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struct ofnode_phandle_args args;
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u32 *syscfg_base;
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u32 mem_remap;
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u32 swp_fmc;
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ofnode bank_node;
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char *bank_name;
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u8 bank = 0;
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int ret;
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ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
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&args);
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if (ret) {
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dev_dbg(dev, "%s: can't find syscon device (%d)\n", __func__, ret);
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} else {
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syscfg_base = (u32 *)ofnode_get_addr(args.node);
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mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
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if (mem_remap != NOT_FOUND) {
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/* set memory mapping selection */
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clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
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} else {
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dev_dbg(dev, "%s: cannot find st,mem_remap property\n", __func__);
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}
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swp_fmc = dev_read_u32_default(dev, "st,swp_fmc", NOT_FOUND);
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if (swp_fmc != NOT_FOUND) {
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/* set fmc swapping selection */
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clrsetbits_le32(syscfg_base, SWP_FMC_MASK, swp_fmc << SWP_FMC_OFFSET);
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} else {
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dev_dbg(dev, "%s: cannot find st,swp_fmc property\n", __func__);
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}
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dev_dbg(dev, "syscfg %x = %x\n", (u32)syscfg_base, *syscfg_base);
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}
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dev_for_each_subnode(bank_node, dev) {
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/* extract the bank index from DT */
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bank_name = (char *)ofnode_get_name(bank_node);
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strsep(&bank_name, "@");
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if (!bank_name) {
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pr_err("missing sdram bank index");
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return -EINVAL;
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}
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bank_params = ¶ms->bank_params[bank];
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strict_strtoul(bank_name, 10,
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(long unsigned int *)&bank_params->target_bank);
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if (bank_params->target_bank >= MAX_SDRAM_BANK) {
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pr_err("Found bank %d , but only bank 0 and 1 are supported",
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bank_params->target_bank);
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return -EINVAL;
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}
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debug("Find bank %s %u\n", bank_name, bank_params->target_bank);
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params->bank_params[bank].sdram_control =
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(struct stm32_sdram_control *)
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ofnode_read_u8_array_ptr(bank_node,
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"st,sdram-control",
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sizeof(struct stm32_sdram_control));
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if (!params->bank_params[bank].sdram_control) {
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pr_err("st,sdram-control not found for %s",
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ofnode_get_name(bank_node));
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return -EINVAL;
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}
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params->bank_params[bank].sdram_timing =
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(struct stm32_sdram_timing *)
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ofnode_read_u8_array_ptr(bank_node,
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"st,sdram-timing",
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sizeof(struct stm32_sdram_timing));
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if (!params->bank_params[bank].sdram_timing) {
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pr_err("st,sdram-timing not found for %s",
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ofnode_get_name(bank_node));
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return -EINVAL;
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}
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bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
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"st,sdram-refcount", 8196);
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bank++;
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}
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params->no_sdram_banks = bank;
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debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);
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return 0;
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}
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static int stm32_fmc_probe(struct udevice *dev)
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{
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struct stm32_sdram_params *params = dev_get_platdata(dev);
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int ret;
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fdt_addr_t addr;
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addr = dev_read_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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params->base = (struct stm32_fmc_regs *)addr;
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params->family = dev_get_driver_data(dev);
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#ifdef CONFIG_CLK
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struct clk clk;
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret < 0)
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return ret;
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ret = clk_enable(&clk);
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if (ret) {
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dev_err(dev, "failed to enable clock\n");
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return ret;
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}
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#endif
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ret = stm32_sdram_init(dev);
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if (ret)
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return ret;
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return 0;
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}
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static int stm32_fmc_get_info(struct udevice *dev, struct ram_info *info)
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{
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return 0;
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}
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static struct ram_ops stm32_fmc_ops = {
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.get_info = stm32_fmc_get_info,
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};
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static const struct udevice_id stm32_fmc_ids[] = {
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{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
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{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
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{ }
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};
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U_BOOT_DRIVER(stm32_fmc) = {
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.name = "stm32_fmc",
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.id = UCLASS_RAM,
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.of_match = stm32_fmc_ids,
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.ops = &stm32_fmc_ops,
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.ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
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.probe = stm32_fmc_probe,
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.platdata_auto_alloc_size = sizeof(struct stm32_sdram_params),
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};
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