diff options
Diffstat (limited to 'arch/arm/mach-aspeed/ast2500/sdram_ast2500.c')
| -rw-r--r-- | arch/arm/mach-aspeed/ast2500/sdram_ast2500.c | 432 |
1 files changed, 432 insertions, 0 deletions
diff --git a/arch/arm/mach-aspeed/ast2500/sdram_ast2500.c b/arch/arm/mach-aspeed/ast2500/sdram_ast2500.c new file mode 100644 index 0000000000..ace1028116 --- /dev/null +++ b/arch/arm/mach-aspeed/ast2500/sdram_ast2500.c @@ -0,0 +1,432 @@ +/* + * Copyright (C) 2012-2020 ASPEED Technology Inc. + * + * Copyright 2016 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <errno.h> +#include <ram.h> +#include <regmap.h> +#include <asm/io.h> +#include <asm/arch/scu_ast2500.h> +#include <asm/arch/sdram_ast2500.h> +#include <asm/arch/wdt.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <dt-bindings/clock/ast2500-scu.h> + +/* These configuration parameters are taken from Aspeed SDK */ +#define DDR4_MR46_MODE 0x08000000 +#define DDR4_MR5_MODE 0x400 +#define DDR4_MR13_MODE 0x101 +#define DDR4_MR02_MODE 0x410 +#define DDR4_TRFC 0x45457188 + +#define PHY_CFG_SIZE 15 + +static const u32 ddr4_ac_timing[3] = {0x63604e37, 0xe97afa99, 0x00019000}; +static const struct { + u32 index[PHY_CFG_SIZE]; + u32 value[PHY_CFG_SIZE]; +} ddr4_phy_config = { + .index = {0, 1, 3, 4, 5, 56, 57, 58, 59, 60, 61, 62, 36, 49, 50}, + .value = { + 0x42492aae, 0x09002000, 0x55e00b0b, 0x20000000, 0x24, + 0x03002900, 0x0e0000a0, 0x000e001c, 0x35b8c106, 0x08080607, + 0x9b000900, 0x0e400a00, 0x00100008, 0x3c183c3c, 0x00631e0e, + }, +}; + +#define SDRAM_MAX_SIZE (1024 * 1024 * 1024) +#define SDRAM_MIN_SIZE (128 * 1024 * 1024) + +DECLARE_GLOBAL_DATA_PTR; + +/* + * Bandwidth configuration parameters for different SDRAM requests. + * These are hardcoded settings taken from Aspeed SDK. + */ +static const u32 ddr_max_grant_params[4] = { + 0x88448844, 0x24422288, 0x22222222, 0x22222222 +}; + +/* + * These registers are not documented by Aspeed at all. + * All writes and reads are taken pretty much as is from SDK. + */ +struct ast2500_ddr_phy { + u32 phy[117]; +}; + +struct dram_info { + struct ram_info info; + struct clk ddr_clk; + struct ast2500_sdrammc_regs *regs; + struct ast2500_scu *scu; + struct ast2500_ddr_phy *phy; + ulong clock_rate; +}; + +static int ast2500_sdrammc_init_phy(struct ast2500_ddr_phy *phy) +{ + writel(0, &phy->phy[2]); + writel(0, &phy->phy[6]); + writel(0, &phy->phy[8]); + writel(0, &phy->phy[10]); + writel(0, &phy->phy[12]); + writel(0, &phy->phy[42]); + writel(0, &phy->phy[44]); + + writel(0x86000000, &phy->phy[16]); + writel(0x00008600, &phy->phy[17]); + writel(0x80000000, &phy->phy[18]); + writel(0x80808080, &phy->phy[19]); + + return 0; +} + +static void ast2500_ddr_phy_init_process(struct dram_info *info) +{ + struct ast2500_sdrammc_regs *regs = info->regs; + + writel(0, ®s->phy_ctrl[0]); + writel(0x4040, &info->phy->phy[51]); + + writel(SDRAM_PHYCTRL0_NRST | SDRAM_PHYCTRL0_INIT, ®s->phy_ctrl[0]); + while ((readl(®s->phy_ctrl[0]) & SDRAM_PHYCTRL0_INIT)) + ; + writel(SDRAM_PHYCTRL0_NRST | SDRAM_PHYCTRL0_AUTO_UPDATE, + ®s->phy_ctrl[0]); +} + +static void ast2500_sdrammc_set_vref(struct dram_info *info, u32 vref) +{ + writel(0, &info->regs->phy_ctrl[0]); + writel((vref << 8) | 0x6, &info->phy->phy[48]); + ast2500_ddr_phy_init_process(info); +} + +static int ast2500_ddr_cbr_test(struct dram_info *info) +{ + struct ast2500_sdrammc_regs *regs = info->regs; + int i; + const u32 test_params = SDRAM_TEST_EN + | SDRAM_TEST_ERRSTOP + | SDRAM_TEST_TWO_MODES; + int ret = 0; + + writel((1 << SDRAM_REFRESH_CYCLES_SHIFT) | + (0x5c << SDRAM_REFRESH_PERIOD_SHIFT), ®s->refresh_timing); + writel((0xfff << SDRAM_TEST_LEN_SHIFT), ®s->test_addr); + writel(0xff00ff00, ®s->test_init_val); + writel(SDRAM_TEST_EN | (SDRAM_TEST_MODE_RW << SDRAM_TEST_MODE_SHIFT) | + SDRAM_TEST_ERRSTOP, ®s->ecc_test_ctrl); + + while (!(readl(®s->ecc_test_ctrl) & SDRAM_TEST_DONE)) + ; + + if (readl(®s->ecc_test_ctrl) & SDRAM_TEST_FAIL) { + ret = -EIO; + } else { + for (i = 0; i <= SDRAM_TEST_GEN_MODE_MASK; ++i) { + writel((i << SDRAM_TEST_GEN_MODE_SHIFT) | test_params, + ®s->ecc_test_ctrl); + while (!(readl(®s->ecc_test_ctrl) & SDRAM_TEST_DONE)) + ; + if (readl(®s->ecc_test_ctrl) & SDRAM_TEST_FAIL) { + ret = -EIO; + break; + } + } + } + + writel(0, ®s->refresh_timing); + writel(0, ®s->ecc_test_ctrl); + + return ret; +} + +static int ast2500_sdrammc_ddr4_calibrate_vref(struct dram_info *info) +{ + int i; + int vref_min = 0xff; + int vref_max = 0; + int range_size = 0; + + for (i = 1; i < 0x40; ++i) { + int res; + + ast2500_sdrammc_set_vref(info, i); + res = ast2500_ddr_cbr_test(info); + if (res < 0) { + if (range_size > 0) + break; + } else { + ++range_size; + vref_min = min(vref_min, i); + vref_max = max(vref_max, i); + } + } + + /* Pick average setting */ + ast2500_sdrammc_set_vref(info, (vref_min + vref_max + 1) / 2); + + return 0; +} + +static size_t ast2500_sdrammc_get_vga_mem_size(struct dram_info *info) +{ + size_t vga_mem_size_base = 8 * 1024 * 1024; + u32 vga_hwconf = (readl(&info->scu->hwstrap) + >> SCU_HWSTRAP_VGAMEM_SHIFT) + & SCU_HWSTRAP_VGAMEM_MASK; + + return vga_mem_size_base << vga_hwconf; +} + +/* + * Find out RAM size and save it in dram_info + * + * The procedure is taken from Aspeed SDK + */ +static void ast2500_sdrammc_calc_size(struct dram_info *info) +{ + /* The controller supports 128/256/512/1024 MB ram */ + size_t ram_size = SDRAM_MIN_SIZE; + const int write_test_offset = 0x100000; + u32 test_pattern = 0xdeadbeef; + u32 cap_param = SDRAM_CONF_CAP_1024M; + u32 refresh_timing_param = DDR4_TRFC; + const u32 write_addr_base = CONFIG_SYS_SDRAM_BASE + write_test_offset; + + for (ram_size = SDRAM_MAX_SIZE; ram_size > SDRAM_MIN_SIZE; + ram_size >>= 1) { + writel(test_pattern, write_addr_base + (ram_size >> 1)); + test_pattern = (test_pattern >> 4) | (test_pattern << 28); + } + + /* One last write to overwrite all wrapped values */ + writel(test_pattern, write_addr_base); + + /* Reset the pattern and see which value was really written */ + test_pattern = 0xdeadbeef; + for (ram_size = SDRAM_MAX_SIZE; ram_size > SDRAM_MIN_SIZE; + ram_size >>= 1) { + if (readl(write_addr_base + (ram_size >> 1)) == test_pattern) + break; + + --cap_param; + refresh_timing_param >>= 8; + test_pattern = (test_pattern >> 4) | (test_pattern << 28); + } + + clrsetbits_le32(&info->regs->ac_timing[1], + (SDRAM_AC_TRFC_MASK << SDRAM_AC_TRFC_SHIFT), + ((refresh_timing_param & SDRAM_AC_TRFC_MASK) + << SDRAM_AC_TRFC_SHIFT)); + + info->info.base = CONFIG_SYS_SDRAM_BASE; + info->info.size = ram_size - ast2500_sdrammc_get_vga_mem_size(info); + clrsetbits_le32(&info->regs->config, + (SDRAM_CONF_CAP_MASK << SDRAM_CONF_CAP_SHIFT), + ((cap_param & SDRAM_CONF_CAP_MASK) + << SDRAM_CONF_CAP_SHIFT)); +} + +static int ast2500_sdrammc_init_ddr4(struct dram_info *info) +{ + int i; + const u32 power_control = SDRAM_PCR_CKE_EN + | (1 << SDRAM_PCR_CKE_DELAY_SHIFT) + | (2 << SDRAM_PCR_TCKE_PW_SHIFT) + | SDRAM_PCR_RESETN_DIS + | SDRAM_PCR_RGAP_CTRL_EN | SDRAM_PCR_ODT_EN | SDRAM_PCR_ODT_EXT_EN; + const u32 conf = (SDRAM_CONF_CAP_1024M << SDRAM_CONF_CAP_SHIFT) +#ifdef CONFIG_DUALX8_RAM + | SDRAM_CONF_DUALX8 +#endif + | SDRAM_CONF_SCRAMBLE | SDRAM_CONF_SCRAMBLE_PAT2 | SDRAM_CONF_DDR4; + int ret; + + writel(conf, &info->regs->config); + for (i = 0; i < ARRAY_SIZE(ddr4_ac_timing); ++i) + writel(ddr4_ac_timing[i], &info->regs->ac_timing[i]); + + writel(DDR4_MR46_MODE, &info->regs->mr46_mode_setting); + writel(DDR4_MR5_MODE, &info->regs->mr5_mode_setting); + writel(DDR4_MR02_MODE, &info->regs->mr02_mode_setting); + writel(DDR4_MR13_MODE, &info->regs->mr13_mode_setting); + + for (i = 0; i < PHY_CFG_SIZE; ++i) { + writel(ddr4_phy_config.value[i], + &info->phy->phy[ddr4_phy_config.index[i]]); + } + + writel(power_control, &info->regs->power_control); + + ast2500_ddr_phy_init_process(info); + + ret = ast2500_sdrammc_ddr4_calibrate_vref(info); + if (ret < 0) { + debug("Vref calibration failed!\n"); + return ret; + } + + writel((1 << SDRAM_REFRESH_CYCLES_SHIFT) + | SDRAM_REFRESH_ZQCS_EN | (0x2f << SDRAM_REFRESH_PERIOD_SHIFT), + &info->regs->refresh_timing); + + setbits_le32(&info->regs->power_control, + SDRAM_PCR_AUTOPWRDN_EN | SDRAM_PCR_ODT_AUTO_ON); + + ast2500_sdrammc_calc_size(info); + + setbits_le32(&info->regs->config, SDRAM_CONF_CACHE_INIT_EN); + while (!(readl(&info->regs->config) & SDRAM_CONF_CACHE_INIT_DONE)) + ; + setbits_le32(&info->regs->config, SDRAM_CONF_CACHE_EN); + + writel(SDRAM_MISC_DDR4_TREFRESH, &info->regs->misc_control); + + /* Enable all requests except video & display */ + writel(SDRAM_REQ_USB20_EHCI1 + | SDRAM_REQ_USB20_EHCI2 + | SDRAM_REQ_CPU + | SDRAM_REQ_AHB2 + | SDRAM_REQ_AHB + | SDRAM_REQ_MAC0 + | SDRAM_REQ_MAC1 + | SDRAM_REQ_PCIE + | SDRAM_REQ_XDMA + | SDRAM_REQ_ENCRYPTION + | SDRAM_REQ_VIDEO_FLAG + | SDRAM_REQ_VIDEO_LOW_PRI_WRITE + | SDRAM_REQ_2D_RW + | SDRAM_REQ_MEMCHECK, &info->regs->req_limit_mask); + + return 0; +} + +static void ast2500_sdrammc_unlock(struct dram_info *info) +{ + writel(SDRAM_UNLOCK_KEY, &info->regs->protection_key); + while (!readl(&info->regs->protection_key)) + ; +} + +static void ast2500_sdrammc_lock(struct dram_info *info) +{ + writel(~SDRAM_UNLOCK_KEY, &info->regs->protection_key); + while (readl(&info->regs->protection_key)) + ; +} + +static int ast2500_sdrammc_probe(struct udevice *dev) +{ + struct dram_info *priv = (struct dram_info *)dev_get_priv(dev); + struct ast2500_sdrammc_regs *regs = priv->regs; + int i; + int ret = clk_get_by_index(dev, 0, &priv->ddr_clk); + + if (ret) { + debug("DDR:No CLK\n"); + return ret; + } + + priv->scu = ast_get_scu(); + if (IS_ERR(priv->scu)) { + debug("%s(): can't get SCU\n", __func__); + return PTR_ERR(priv->scu); + } + + clk_set_rate(&priv->ddr_clk, priv->clock_rate); + ret = ast_wdt_reset_masked(ast_get_wdt(0), WDT_RESET_SDRAM); + if (ret) { + debug("%s(): SDRAM reset failed\n", __func__); + return ret; + } + + ast2500_sdrammc_unlock(priv); + + writel(SDRAM_PCR_MREQI_DIS | SDRAM_PCR_RESETN_DIS, + ®s->power_control); + writel(SDRAM_VIDEO_UNLOCK_KEY, ®s->gm_protection_key); + + /* Mask all requests except CPU and AHB during PHY init */ + writel(~(SDRAM_REQ_CPU | SDRAM_REQ_AHB), ®s->req_limit_mask); + + for (i = 0; i < ARRAY_SIZE(ddr_max_grant_params); ++i) + writel(ddr_max_grant_params[i], ®s->max_grant_len[i]); + + setbits_le32(®s->intr_ctrl, SDRAM_ICR_RESET_ALL); + + ast2500_sdrammc_init_phy(priv->phy); + if (readl(&priv->scu->hwstrap) & SCU_HWSTRAP_DDR4) { + ast2500_sdrammc_init_ddr4(priv); + } else { + debug("Unsupported DRAM3\n"); + return -EINVAL; + } + + clrbits_le32(®s->intr_ctrl, SDRAM_ICR_RESET_ALL); + ast2500_sdrammc_lock(priv); + + return 0; +} + +static int ast2500_sdrammc_ofdata_to_platdata(struct udevice *dev) +{ + struct dram_info *priv = dev_get_priv(dev); + struct regmap *map; + int ret; + + ret = regmap_init_mem(dev, &map); + if (ret) + return ret; + + priv->regs = regmap_get_range(map, 0); + priv->phy = regmap_get_range(map, 1); + + priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "clock-frequency", 0); + + if (!priv->clock_rate) { + debug("DDR Clock Rate not defined\n"); + return -EINVAL; + } + + return 0; +} + +static int ast2500_sdrammc_get_info(struct udevice *dev, struct ram_info *info) +{ + struct dram_info *priv = dev_get_priv(dev); + + *info = priv->info; + + return 0; +} + +static struct ram_ops ast2500_sdrammc_ops = { + .get_info = ast2500_sdrammc_get_info, +}; + +static const struct udevice_id ast2500_sdrammc_ids[] = { + { .compatible = "aspeed,ast2500-sdrammc" }, + { } +}; + +U_BOOT_DRIVER(sdrammc_ast2500) = { + .name = "aspeed_ast2500_sdrammc", + .id = UCLASS_RAM, + .of_match = ast2500_sdrammc_ids, + .ops = &ast2500_sdrammc_ops, + .ofdata_to_platdata = ast2500_sdrammc_ofdata_to_platdata, + .probe = ast2500_sdrammc_probe, + .priv_auto_alloc_size = sizeof(struct dram_info), +}; |