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/*
* (C) Copyright 2017
* Vikas Manocha, <vikas.manocha@st.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <ram.h>
#include <asm/io.h>
#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 sdclk;
u8 rd_burst;
u8 rd_pipe_delay;
};
struct stm32_sdram_timing {
u8 tmrd;
u8 txsr;
u8 tras;
u8 trc;
u8 trp;
u8 twr;
u8 trcd;
};
struct stm32_sdram_params {
u8 no_sdram_banks;
struct stm32_sdram_control sdram_control;
struct stm32_sdram_timing sdram_timing;
u32 sdram_ref_count;
};
#define SDRAM_MODE_BL_SHIFT 0
#define SDRAM_MODE_CAS_SHIFT 4
#define SDRAM_MODE_BL 0
int stm32_sdram_init(struct udevice *dev)
{
struct stm32_sdram_params *params = dev_get_platdata(dev);
writel(params->sdram_control.sdclk << FMC_SDCR_SDCLK_SHIFT
| 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(params->sdram_timing.trcd << FMC_SDTR_TRCD_SHIFT
| params->sdram_timing.trp << FMC_SDTR_TRP_SHIFT
| params->sdram_timing.twr << FMC_SDTR_TWR_SHIFT
| params->sdram_timing.trc << FMC_SDTR_TRC_SHIFT
| params->sdram_timing.tras << FMC_SDTR_TRAS_SHIFT
| params->sdram_timing.txsr << FMC_SDTR_TXSR_SHIFT
| 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);
udelay(200); /* 200 us delay, page 10, "Power-Up" */
FMC_BUSY_WAIT();
writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_PRECHARGE,
&STM32_SDRAM_FMC->sdcmr);
udelay(100);
FMC_BUSY_WAIT();
writel((FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_AUTOREFRESH
| 7 << FMC_SDCMR_NRFS_SHIFT), &STM32_SDRAM_FMC->sdcmr);
udelay(100);
FMC_BUSY_WAIT();
writel(FMC_SDCMR_BANK_1 | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
| params->sdram_control.cas_latency << SDRAM_MODE_CAS_SHIFT)
<< FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
&STM32_SDRAM_FMC->sdcmr);
udelay(100);
FMC_BUSY_WAIT();
writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_NORMAL,
&STM32_SDRAM_FMC->sdcmr);
FMC_BUSY_WAIT();
/* Refresh timer */
writel((params->sdram_ref_count) << 1, &STM32_SDRAM_FMC->sdrtr);
return 0;
}
static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
{
int ret;
int node = dev_of_offset(dev);
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;
params->sdram_ref_count = fdtdec_get_int(blob, node,
"st,sdram-refcount", 8196);
}
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;
ret = clk_enable(&clk);
if (ret) {
dev_err(dev, "failed to enable clock\n");
return ret;
}
#endif
ret = stm32_sdram_init(dev);
if (ret)
return ret;
return 0;
}
static int stm32_fmc_get_info(struct udevice *dev, struct ram_info *info)
{
return 0;
}
static struct ram_ops stm32_fmc_ops = {
.get_info = stm32_fmc_get_info,
};
static const struct udevice_id stm32_fmc_ids[] = {
{ .compatible = "st,stm32-fmc" },
{ }
};
U_BOOT_DRIVER(stm32_fmc) = {
.name = "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),
};
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