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author | Vikas Manocha <vikas.manocha@st.com> | 2017-04-10 22:02:56 (GMT) |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2017-05-08 15:39:05 (GMT) |
commit | 6c9a10034a21680c4b2595d9b6468a767dedebca (patch) | |
tree | c39f998751f91fa06bf84d6096ac57b38e73d0e1 /drivers | |
parent | d0b24c1aa96729d4d9fee02e2c60fc920068c6c5 (diff) | |
download | u-boot-6c9a10034a21680c4b2595d9b6468a767dedebca.tar.xz |
stm32f7: sdram: use sdram device tree node to configure sdram controller
Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
cc: Christophe KERELLO <christophe.kerello@st.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/ram/stm32_sdram.c | 144 |
1 files changed, 91 insertions, 53 deletions
diff --git a/drivers/ram/stm32_sdram.c b/drivers/ram/stm32_sdram.c index 67d8855..eb1ab94 100644 --- a/drivers/ram/stm32_sdram.c +++ b/drivers/ram/stm32_sdram.c @@ -13,6 +13,31 @@ #include <asm/arch/fmc.h> #include <asm/arch/stm32.h> +DECLARE_GLOBAL_DATA_PTR; + +struct stm32_sdram_control { + u8 no_columns; + u8 no_rows; + u8 memory_width; + u8 no_banks; + u8 cas_latency; + u8 rd_burst; + u8 rd_pipe_delay; +}; + +struct stm32_sdram_timing { + u8 tmrd; + u8 txsr; + u8 tras; + u8 trc; + u8 trp; + u8 trcd; +}; +struct stm32_sdram_params { + u8 no_sdram_banks; + struct stm32_sdram_control sdram_control; + struct stm32_sdram_timing sdram_timing; +}; static inline u32 _ns2clk(u32 ns, u32 freq) { u32 tmp = freq/1000000; @@ -21,73 +46,53 @@ static inline u32 _ns2clk(u32 ns, u32 freq) #define NS2CLK(ns) (_ns2clk(ns, freq)) -/* - * Following are timings for IS42S16400J, from corresponding datasheet - */ -#define SDRAM_CAS 3 /* 3 cycles */ -#define SDRAM_NB 1 /* Number of banks */ -#define SDRAM_MWID 1 /* 16 bit memory */ - -#define SDRAM_NR 0x1 /* 12-bit row */ -#define SDRAM_NC 0x0 /* 8-bit col */ -#define SDRAM_RBURST 0x1 /* Single read requests always as bursts */ -#define SDRAM_RPIPE 0x0 /* No HCLK clock cycle delay */ - -#define SDRAM_TRRD NS2CLK(12) -#define SDRAM_TRCD NS2CLK(18) -#define SDRAM_TRP NS2CLK(18) -#define SDRAM_TRAS NS2CLK(42) -#define SDRAM_TRC NS2CLK(60) -#define SDRAM_TRFC NS2CLK(60) -#define SDRAM_TCDL (1 - 1) -#define SDRAM_TRDL NS2CLK(12) -#define SDRAM_TBDL (1 - 1) #define SDRAM_TREF (NS2CLK(64000000 / 8192) - 20) -#define SDRAM_TCCD (1 - 1) - -#define SDRAM_TXSR SDRAM_TRFC /* Row cycle time after precharge */ -#define SDRAM_TMRD 1 /* Page 10, Mode Register Set */ - - -/* Last data in to row precharge, need also comply ineq on page 1648 */ -#define SDRAM_TWR max(\ - (int)max((int)SDRAM_TRDL, (int)(SDRAM_TRAS - SDRAM_TRCD)), \ - (int)(SDRAM_TRC - SDRAM_TRCD - SDRAM_TRP)\ - ) - #define SDRAM_MODE_BL_SHIFT 0 #define SDRAM_MODE_CAS_SHIFT 4 #define SDRAM_MODE_BL 0 -#define SDRAM_MODE_CAS SDRAM_CAS +#define SDRAM_MODE_CAS 3 + +#define SDRAM_TRDL 12 -int stm32_sdram_init(void) +int stm32_sdram_init(struct udevice *dev) { u32 freq; + u32 sdram_twr; + struct stm32_sdram_params *params = dev_get_platdata(dev); /* * Get frequency for NS2CLK calculation. */ freq = clock_get(CLOCK_AHB) / CONFIG_SYS_RAM_FREQ_DIV; + debug("%s, sdram freq = %d\n", __func__, freq); + + /* Last data in to row precharge, need also comply ineq on page 1648 */ + sdram_twr = max( + max(SDRAM_TRDL, params->sdram_timing.tras + - params->sdram_timing.trcd), + params->sdram_timing.trc - params->sdram_timing.trcd + - params->sdram_timing.trp + ); writel(CONFIG_SYS_RAM_FREQ_DIV << FMC_SDCR_SDCLK_SHIFT - | SDRAM_CAS << FMC_SDCR_CAS_SHIFT - | SDRAM_NB << FMC_SDCR_NB_SHIFT - | SDRAM_MWID << FMC_SDCR_MWID_SHIFT - | SDRAM_NR << FMC_SDCR_NR_SHIFT - | SDRAM_NC << FMC_SDCR_NC_SHIFT - | SDRAM_RPIPE << FMC_SDCR_RPIPE_SHIFT - | SDRAM_RBURST << FMC_SDCR_RBURST_SHIFT, - &STM32_SDRAM_FMC->sdcr1); - - writel(SDRAM_TRCD << FMC_SDTR_TRCD_SHIFT - | SDRAM_TRP << FMC_SDTR_TRP_SHIFT - | SDRAM_TWR << FMC_SDTR_TWR_SHIFT - | SDRAM_TRC << FMC_SDTR_TRC_SHIFT - | SDRAM_TRAS << FMC_SDTR_TRAS_SHIFT - | SDRAM_TXSR << FMC_SDTR_TXSR_SHIFT - | SDRAM_TMRD << FMC_SDTR_TMRD_SHIFT, - &STM32_SDRAM_FMC->sdtr1); + | params->sdram_control.cas_latency << FMC_SDCR_CAS_SHIFT + | params->sdram_control.no_banks << FMC_SDCR_NB_SHIFT + | params->sdram_control.memory_width << FMC_SDCR_MWID_SHIFT + | params->sdram_control.no_rows << FMC_SDCR_NR_SHIFT + | params->sdram_control.no_columns << FMC_SDCR_NC_SHIFT + | params->sdram_control.rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT + | params->sdram_control.rd_burst << FMC_SDCR_RBURST_SHIFT, + &STM32_SDRAM_FMC->sdcr1); + + writel(NS2CLK(params->sdram_timing.trcd) << FMC_SDTR_TRCD_SHIFT + | NS2CLK(params->sdram_timing.trp) << FMC_SDTR_TRP_SHIFT + | NS2CLK(sdram_twr) << FMC_SDTR_TWR_SHIFT + | NS2CLK(params->sdram_timing.trc) << FMC_SDTR_TRC_SHIFT + | NS2CLK(params->sdram_timing.tras) << FMC_SDTR_TRAS_SHIFT + | NS2CLK(params->sdram_timing.txsr) << FMC_SDTR_TXSR_SHIFT + | NS2CLK(params->sdram_timing.tmrd) << FMC_SDTR_TMRD_SHIFT, + &STM32_SDRAM_FMC->sdtr1); writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_START_CLOCK, &STM32_SDRAM_FMC->sdcmr); @@ -121,11 +126,39 @@ int stm32_sdram_init(void) return 0; } +static int stm32_fmc_ofdata_to_platdata(struct udevice *dev) +{ + int ret; + int node = dev->of_offset; + const void *blob = gd->fdt_blob; + struct stm32_sdram_params *params = dev_get_platdata(dev); + + params->no_sdram_banks = fdtdec_get_uint(blob, node, "mr-nbanks", 1); + debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks); + + fdt_for_each_subnode(node, blob, node) { + ret = fdtdec_get_byte_array(blob, node, "st,sdram-control", + (u8 *)¶ms->sdram_control, + sizeof(params->sdram_control)); + if (ret) + return ret; + + ret = fdtdec_get_byte_array(blob, node, "st,sdram-timing", + (u8 *)¶ms->sdram_timing, + sizeof(params->sdram_timing)); + if (ret) + return ret; + } + + return 0; +} + static int stm32_fmc_probe(struct udevice *dev) { #ifdef CONFIG_CLK int ret; struct clk clk; + ret = clk_get_by_index(dev, 0, &clk); if (ret < 0) return ret; @@ -137,7 +170,10 @@ static int stm32_fmc_probe(struct udevice *dev) return ret; } #endif - stm32_sdram_init(); + ret = stm32_sdram_init(dev); + if (ret) + return ret; + return 0; } @@ -161,5 +197,7 @@ U_BOOT_DRIVER(stm32_fmc) = { .id = UCLASS_RAM, .of_match = stm32_fmc_ids, .ops = &stm32_fmc_ops, + .ofdata_to_platdata = stm32_fmc_ofdata_to_platdata, .probe = stm32_fmc_probe, + .platdata_auto_alloc_size = sizeof(struct stm32_sdram_params), }; |