diff options
Diffstat (limited to 'drivers/ram/renesas/rzn1/ddr_async.c')
| -rw-r--r-- | drivers/ram/renesas/rzn1/ddr_async.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/ram/renesas/rzn1/ddr_async.c b/drivers/ram/renesas/rzn1/ddr_async.c new file mode 100644 index 0000000000..7a81497bc9 --- /dev/null +++ b/drivers/ram/renesas/rzn1/ddr_async.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: BSD-2-Clause +/* + * RZ/N1 DDR Controller initialisation + * + * The DDR Controller register values for a specific DDR device, mode and + * frequency are generated using a Cadence tool. + * + * Copyright (C) 2015 Renesas Electronics Europe Ltd + */ +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <ram.h> +#include <regmap.h> +#include <syscon.h> +#include <asm/io.h> +#include <linux/delay.h> +#include <wait_bit.h> +#include <renesas/ddr_ctrl.h> + +void clk_rzn1_reset_state(struct clk *clk, int on); + +DECLARE_GLOBAL_DATA_PTR; + +struct cadence_ddr_info { + struct udevice *dev; + void __iomem *ddrc; + void __iomem *phy; + struct clk clk_ddrc; + struct clk hclk_ddrc; + struct regmap *syscon; + bool enable_ecc; + bool enable_8bit; + u32 ddr_size; + + /* These two used only during .probe */ + u32 *reg0; + u32 *reg350; +}; + +static inline u32 cadence_readl(void __iomem *addr, unsigned int offset) +{ + return readl(addr + offset); +} + +static inline void cadence_writel(void __iomem *addr, unsigned int offset, + u32 data) +{ + debug("%s: addr = 0x%p, value = 0x%08x\n", __func__, addr + offset, data); + writel(data, addr + offset); +} + +#define ddrc_readl(off) cadence_readl(priv->ddrc, off) +#define ddrc_writel(val, off) cadence_writel(priv->ddrc, off, val) + +#define phy_readl(off) cadence_readl(priv->phy, off) +#define phy_writel(val, off) cadence_writel(priv->phy, off, val) + +#define RZN1_DDR3_SINGLE_BANK 3 +#define RZN1_DDR3_DUAL_BANK 32 + +#define FUNCCTRL 0x00 +#define FUNCCTRL_MASKSDLOFS (0x18 << 16) +#define FUNCCTRL_DVDDQ_1_5V BIT(8) +#define FUNCCTRL_RESET_N BIT(0) +#define DLLCTRL 0x04 +#define DLLCTRL_ASDLLOCK BIT(26) +#define DLLCTRL_MFSL_500MHz (2 << 1) +#define DLLCTRL_MDLLSTBY BIT(0) +#define ZQCALCTRL 0x08 +#define ZQCALCTRL_ZQCALEND BIT(30) +#define ZQCALCTRL_ZQCALRSTB BIT(0) +#define ZQODTCTRL 0x0c +#define RDCTRL 0x10 +#define RDTMG 0x14 +#define FIFOINIT 0x18 +#define FIFOINIT_RDPTINITEXE BIT(8) +#define FIFOINIT_WRPTINITEXE BIT(0) +#define OUTCTRL 0x1c +#define OUTCTRL_ADCMDOE BIT(0) +#define WLCTRL1 0x40 +#define WLCTRL1_WLSTR BIT(24) +#define DQCALOFS1 0xe8 + +/* DDR PHY setup */ +static void ddr_phy_init(struct cadence_ddr_info *priv, int ddr_type) +{ + u32 val; + + /* Disable DDR Controller clock and FlexWAY connection */ + clk_disable(&priv->hclk_ddrc); + clk_disable(&priv->clk_ddrc); + + clk_rzn1_reset_state(&priv->hclk_ddrc, 0); + clk_rzn1_reset_state(&priv->clk_ddrc, 0); + + /* Enable DDR Controller clock and FlexWAY connection */ + clk_enable(&priv->clk_ddrc); + clk_enable(&priv->hclk_ddrc); + + /* DDR PHY Soft reset assert */ + ddrc_writel(FUNCCTRL_MASKSDLOFS | FUNCCTRL_DVDDQ_1_5V, FUNCCTRL); + + clk_rzn1_reset_state(&priv->hclk_ddrc, 1); + clk_rzn1_reset_state(&priv->clk_ddrc, 1); + + /* DDR PHY setup */ + phy_writel(DLLCTRL_MFSL_500MHz | DLLCTRL_MDLLSTBY, DLLCTRL); + phy_writel(0x00000182, ZQCALCTRL); + if (ddr_type == RZN1_DDR3_DUAL_BANK) + phy_writel(0xAB330031, ZQODTCTRL); + else if (ddr_type == RZN1_DDR3_SINGLE_BANK) + phy_writel(0xAB320051, ZQODTCTRL); + else /* DDR2 */ + phy_writel(0xAB330071, ZQODTCTRL); + phy_writel(0xB545B544, RDCTRL); + phy_writel(0x000000B0, RDTMG); + phy_writel(0x020A0806, OUTCTRL); + if (ddr_type == RZN1_DDR3_DUAL_BANK) + phy_writel(0x80005556, WLCTRL1); + else + phy_writel(0x80005C5D, WLCTRL1); + phy_writel(0x00000101, FIFOINIT); + phy_writel(0x00004545, DQCALOFS1); + + /* Step 9 MDLL reset release */ + val = phy_readl(DLLCTRL); + val &= ~DLLCTRL_MDLLSTBY; + phy_writel(val, DLLCTRL); + + /* Step 12 Soft reset release */ + val = phy_readl(FUNCCTRL); + val |= FUNCCTRL_RESET_N; + phy_writel(val, FUNCCTRL); + + /* Step 13 FIFO pointer initialize */ + phy_writel(FIFOINIT_RDPTINITEXE | FIFOINIT_WRPTINITEXE, FIFOINIT); + + /* Step 14 Execute ZQ Calibration */ + val = phy_readl(ZQCALCTRL); + val |= ZQCALCTRL_ZQCALRSTB; + phy_writel(val, ZQCALCTRL); + + /* Step 15 Wait for 200us or more, or wait for DFIINITCOMPLETE to be "1" */ + wait_for_bit_le32(priv->phy + DLLCTRL, DLLCTRL_ASDLLOCK, true, 1, false); + wait_for_bit_le32(priv->phy + ZQCALCTRL, ZQCALCTRL_ZQCALEND, true, 1, false); + + /* Step 16 Enable Address and Command output */ + val = phy_readl(OUTCTRL); + val |= OUTCTRL_ADCMDOE; + phy_writel(val, OUTCTRL); + + /* Step 17 Wait for 200us or more(from MRESETB=0) */ + udelay(200); +} + +static void ddr_phy_enable_wl(struct cadence_ddr_info *priv) +{ + u32 val; + + /* Step 26 (Set Write Leveling) */ + val = phy_readl(WLCTRL1); + val |= WLCTRL1_WLSTR; + phy_writel(val, WLCTRL1); +} + +#define RZN1_V_DDR_BASE 0x80000000 /* RZ/N1D only */ + +static void rzn1_ddr3_single_bank(void *ddr_ctrl_base) +{ + /* CS0 */ + cdns_ddr_set_mr1(ddr_ctrl_base, 0, + MR1_ODT_IMPEDANCE_60_OHMS, + MR1_DRIVE_STRENGTH_40_OHMS); + cdns_ddr_set_mr2(ddr_ctrl_base, 0, + MR2_DYNAMIC_ODT_OFF, + MR2_SELF_REFRESH_TEMP_EXT); + + /* ODT_WR_MAP_CS0 = 1, ODT_RD_MAP_CS0 = 0 */ + cdns_ddr_set_odt_map(ddr_ctrl_base, 0, 0x0100); +} + +static int rzn1_dram_init(struct cadence_ddr_info *priv) +{ + u32 version; + u32 ddr_start_addr = 0; + + ddr_phy_init(priv, RZN1_DDR3_SINGLE_BANK); + + /* + * Override DDR PHY Interface (DFI) related settings + * DFI is the internal interface between the DDR controller and the DDR PHY. + * These settings are specific to the board and can't be known by the settings + * provided for each DDR model within the generated include. + */ + priv->reg350[351 - 350] = 0x001e0000; + priv->reg350[352 - 350] = 0x1e680000; + priv->reg350[353 - 350] = 0x02000020; + priv->reg350[354 - 350] = 0x02000200; + priv->reg350[355 - 350] = 0x00000c30; + priv->reg350[356 - 350] = 0x00009808; + priv->reg350[357 - 350] = 0x020a0706; + priv->reg350[372 - 350] = 0x01000000; + + /* + * On ES1.0 devices, the DDR start address that the DDR Controller sees + * is the physical address of the DDR. However, later devices changed it + * to be 0 in order to fix an issue with DDR out-of-range detection. + */ +#define RZN1_SYSCTRL_REG_VERSION 412 + regmap_read(priv->syscon, RZN1_SYSCTRL_REG_VERSION, &version); + if (version == 0x10) + ddr_start_addr = RZN1_V_DDR_BASE; + + if (priv->enable_ecc) + priv->ddr_size = priv->ddr_size / 2; + + /* DDR Controller is always in ASYNC mode */ + cdns_ddr_ctrl_init(priv->ddrc, 1, + priv->reg0, priv->reg350, + ddr_start_addr, priv->ddr_size, + priv->enable_ecc, priv->enable_8bit); + + rzn1_ddr3_single_bank(priv->ddrc); + cdns_ddr_set_diff_cs_delays(priv->ddrc, 2, 7, 2, 2); + cdns_ddr_set_same_cs_delays(priv->ddrc, 0, 7, 0, 0); + cdns_ddr_set_odt_times(priv->ddrc, 5, 6, 6, 0, 4); + cdns_ddr_ctrl_start(priv->ddrc); + + ddr_phy_enable_wl(priv); + + if (priv->enable_ecc) { + /* + * Any read before a write will trigger an ECC un-correctable error, + * causing a data abort. However, this is also true for any read with a + * size less than the AXI bus width. So, the only sensible solution is + * to write to all of DDR now and take the hit... + */ + memset((void *)RZN1_V_DDR_BASE, 0xff, priv->ddr_size); + } + + return 0; +} + +static int cadence_ddr_get_info(struct udevice *udev, struct ram_info *info) +{ + info->base = 0; + info->size = gd->ram_size; + + return 0; +} + +static struct ram_ops cadence_ddr_ops = { + .get_info = cadence_ddr_get_info, +}; + +static int cadence_ddr_test(long *base, long maxsize) +{ + volatile long *addr = base; + long cnt; + + maxsize /= sizeof(long); + + for (cnt = 1; cnt <= maxsize; cnt <<= 1) { + addr[cnt - 1] = ~cnt; + } + + for (cnt = 1; cnt <= maxsize; cnt <<= 1) { + if (addr[cnt - 1] != ~cnt) { + return 0; + } + } + + return 1; +} + +static int cadence_ddr_probe(struct udevice *dev) +{ + struct cadence_ddr_info *priv = dev_get_priv(dev); + ofnode subnode; + int ret; + + priv->dev = dev; + + priv->ddrc = dev_remap_addr_name(dev, "ddrc"); + if (!priv->ddrc) { + dev_err(dev, "No reg property for Cadence DDR CTRL\n"); + return -EINVAL; + } + + priv->phy = dev_remap_addr_name(dev, "phy"); + if (!priv->phy) { + dev_err(dev, "No reg property for Cadence DDR PHY\n"); + return -EINVAL; + } + + ret = clk_get_by_name(dev, "clk_ddrc", &priv->clk_ddrc); + if (ret) { + dev_err(dev, "No clock for Cadence DDR\n"); + return ret; + } + + ret = clk_get_by_name(dev, "hclk_ddrc", &priv->hclk_ddrc); + if (ret) { + dev_err(dev, "No HCLK for Cadence DDR\n"); + return ret; + } + + priv->syscon = syscon_regmap_lookup_by_phandle(dev, "syscon"); + if (IS_ERR(priv->syscon)) { + dev_err(dev, "No syscon node found\n"); + return PTR_ERR(priv->syscon); + } + + priv->enable_ecc = dev_read_bool(dev, "enable-ecc"); + priv->enable_8bit = dev_read_bool(dev, "enable-8bit"); + + priv->reg0 = malloc(88 * sizeof(u32)); + priv->reg350 = malloc(25 * sizeof(u32)); + if (!priv->reg0 || !priv->reg350) + panic("malloc failure\n"); + + /* There may be multiple DDR configurations to try */ + dev_for_each_subnode(subnode, dev) { + ret = ofnode_read_u32(subnode, "size", &priv->ddr_size); + if (ret) { + dev_err(dev, "No size for Cadence DDR\n"); + continue; + } + + ret = ofnode_read_u32_array(subnode, "cadence,ctl-000", priv->reg0, 88); + if (ret) { + dev_err(dev, "No cadence,ctl-000\n"); + continue; + } + + ret = ofnode_read_u32_array(subnode, "cadence,ctl-350", priv->reg350, 25); + if (ret) { + dev_err(dev, "No cadence,ctl-350\n"); + continue; + } + + if (rzn1_dram_init(priv)) + continue; + + if (cadence_ddr_test((long *)RZN1_V_DDR_BASE, priv->ddr_size)) { + gd->ram_base = RZN1_V_DDR_BASE; + gd->ram_size = priv->ddr_size; + break; + } + } + + if (!priv->ddr_size) + panic("No valid DDR to start"); + + free(priv->reg350); + free(priv->reg0); + + return 0; +} + +static const struct udevice_id cadence_ddr_ids[] = { + { .compatible = "cadence,ddr-ctrl" }, + { } +}; + +U_BOOT_DRIVER(cadence_ddr) = { + .name = "cadence_ddr", + .id = UCLASS_RAM, + .of_match = cadence_ddr_ids, + .ops = &cadence_ddr_ops, + .probe = cadence_ddr_probe, + .priv_auto = sizeof(struct cadence_ddr_info), + .flags = DM_FLAG_PRE_RELOC, +}; |