[RFC PATCH v3 5/9] ram: cadence: add driver for Cadence EDAC

Ralph Siemsen
2023-02-22T15:45:34Z

Driver for Cadence EDAC DDR controller, as found in the Renesas RZ/N1.

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
---

Changes in v3:
- assorted small cleanups
- support version 1.0 silicon (previously #if 0...)

drivers/ram/Kconfig | 1 +
drivers/ram/Makefile | 2 +
drivers/ram/cadence/Kconfig | 12 +
drivers/ram/cadence/Makefile | 1 +
drivers/ram/cadence/ddr_async.c | 311 ++++++++++++++++++++++++
drivers/ram/cadence/ddr_ctrl.c | 414 ++++++++++++++++++++++++++++++++
drivers/ram/cadence/ddr_ctrl.h | 175 ++++++++++++++
7 files changed, 916 insertions(+)
create mode 100644 drivers/ram/cadence/Kconfig
create mode 100644 drivers/ram/cadence/Makefile
create mode 100644 drivers/ram/cadence/ddr_async.c
create mode 100644 drivers/ram/cadence/ddr_ctrl.c
create mode 100644 drivers/ram/cadence/ddr_ctrl.h

diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index e085119963..2b6d8f1c7b 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -108,6 +108,7 @@ config IMXRT_SDRAM
This driver is for the sdram memory interface with the SEMC.

source "drivers/ram/aspeed/Kconfig"
+source "drivers/ram/cadence/Kconfig"
source "drivers/ram/rockchip/Kconfig"
source "drivers/ram/sifive/Kconfig"
source "drivers/ram/stm32mp1/Kconfig"
diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile
index 83948e2c43..e2d5e730d1 100644
--- a/drivers/ram/Makefile
+++ b/drivers/ram/Makefile
@@ -22,3 +22,5 @@ obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o
obj-$(CONFIG_RAM_SIFIVE) += sifive/

obj-$(CONFIG_ARCH_OCTEON) += octeon/
+
+obj-$(CONFIG_CADENCE_DDR_CTRL) += cadence/
diff --git a/drivers/ram/cadence/Kconfig b/drivers/ram/cadence/Kconfig
new file mode 100644
index 0000000000..2d5469cb8e
--- /dev/null
+++ b/drivers/ram/cadence/Kconfig
@@ -0,0 +1,12 @@
+if RAM || SPL_RAM
+
+config CADENCE_DDR_CTRL
+ bool "Enable Cadence DDR controller"
+ depends on DM
+ help
+ Enable support for Cadence DDR controller, as found on
+ the Renesas RZ/N1 SoC. This controller has a large number
+ of registers which need to be programmed, mostly using values
+ obtained from Denali SOMA files via a TCL script.
+
+endif
diff --git a/drivers/ram/cadence/Makefile b/drivers/ram/cadence/Makefile
new file mode 100644
index 0000000000..16c7fe8488
--- /dev/null
+++ b/drivers/ram/cadence/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_CADENCE_DDR_CTRL) += ddr_async.o ddr_ctrl.o
diff --git a/drivers/ram/cadence/ddr_async.c b/drivers/ram/cadence/ddr_async.c
new file mode 100644
index 0000000000..444eeb8ac7
--- /dev/null
+++ b/drivers/ram/cadence/ddr_async.c
@@ -0,0 +1,311 @@
+// 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 "ddr_ctrl.h"
+
+void clk_rzn1_reset_state(struct clk *clk, int on);
+
+extern u32 ddr_00_87_async[];
+extern u32 ddr_350_374_async[];
+
+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;
+};
+
+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 (1 << 8)
+#define FUNCCTRL_RESET_N (1 << 0)
+#define DLLCTRL 0x04
+#define DLLCTRL_ASDLLOCK (1 << 26)
+#define DLLCTRL_MFSL_500MHz (2 << 1)
+#define DLLCTRL_MDLLSTBY (1 << 0)
+#define ZQCALCTRL 0x08
+#define ZQCALCTRL_ZQCALEND (1 << 30)
+#define ZQCALCTRL_ZQCALRSTB (1 << 0)
+#define ZQODTCTRL 0x0c
+#define RDCTRL 0x10
+#define RDTMG 0x14
+#define FIFOINIT 0x18
+#define FIFOINIT_RDPTINITEXE (1 << 8)
+#define FIFOINIT_WRPTINITEXE (1 << 0)
+#define OUTCTRL 0x1c
+#define OUTCTRL_ADCMDOE (1 << 0)
+#define WLCTRL1 0x40
+#define WLCTRL1_WLSTR (1 << 24)
+#define DQCALOFS1 0xe8
+
+/* DDR PHY setup */
+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" */
+ while (!(phy_readl(DLLCTRL) & DLLCTRL_ASDLLOCK))
+ ;
+ while (!(phy_readl(ZQCALCTRL) & ZQCALCTRL_ZQCALEND))
+ ;
+
+ /* 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);
+}
+
+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_DDR_BASE 0x4000D000 /* RZ/N1D only */
+#define RZN1_V_DDR_BASE 0x80000000 /* RZ/N1D only */
+
+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);
+}
+
+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.
+ */
+ ddr_350_374_async[351 - 350] = 0x001e0000;
+ ddr_350_374_async[352 - 350] = 0x1e680000;
+ ddr_350_374_async[353 - 350] = 0x02000020;
+ ddr_350_374_async[354 - 350] = 0x02000200;
+ ddr_350_374_async[355 - 350] = 0x00000c30;
+ ddr_350_374_async[356 - 350] = 0x00009808;
+ ddr_350_374_async[357 - 350] = 0x020a0706;
+ ddr_350_374_async[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;
+
+ /* DDR Controller is always in ASYNC mode */
+ cdns_ddr_ctrl_init((void *)RZN1_DDR_BASE, 1,
+ ddr_00_87_async, ddr_350_374_async,
+ ddr_start_addr, CFG_SYS_SDRAM_SIZE,
+ priv->enable_ecc, priv->enable_8bit);
+
+ rzn1_ddr3_single_bank((void *)RZN1_DDR_BASE);
+ cdns_ddr_set_diff_cs_delays((void *)RZN1_DDR_BASE, 2, 7, 2, 2);
+ cdns_ddr_set_same_cs_delays((void *)RZN1_DDR_BASE, 0, 7, 0, 0);
+ cdns_ddr_set_odt_times((void *)RZN1_DDR_BASE, 5, 6, 6, 0, 4);
+ cdns_ddr_ctrl_start((void *)RZN1_DDR_BASE);
+
+ 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, CFG_SYS_SDRAM_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_probe(struct udevice *dev)
+{
+ struct cadence_ddr_info *priv = dev_get_priv(dev);
+ int ret;
+
+ 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");
+
+ rzn1_dram_init(priv);
+
+ 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,
+};
diff --git a/drivers/ram/cadence/ddr_ctrl.c b/drivers/ram/cadence/ddr_ctrl.c
new file mode 100644
index 0000000000..3ab2b2cc31
--- /dev/null
+++ b/drivers/ram/cadence/ddr_ctrl.c
@@ -0,0 +1,414 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Cadence DDR Controller
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe Ltd
+ */
+
+/*
+ * The Cadence DDR Controller has a huge number of registers that principally
+ * cover two aspects, DDR specific timing information and AXI bus interfacing.
+ * Cadence's TCL script generates all of the register values for specific
+ * DDR devices operating at a specific frequency. The TCL script uses Denali
+ * SOMA files as inputs. The tool also generates the AXI bus register values as
+ * well, however this driver assumes that users will want to modifiy these to
+ * meet a specific application's needs.
+ * Therefore, this driver is passed two arrays containing register values for
+ * the DDR device specific information, and explicity sets the AXI registers.
+ *
+ * AXI bus interfacing:
+ * The controller has four AXI slaves connections, and each of these can be
+ * programmed to accept requests from specific AXI masters (using their IDs).
+ * The regions of DDR that can be accessed by each AXI slave can be set such
+ * as to isolate DDR used by one AXI master from another. Further, the maximum
+ * bandwidth allocated to each AXI slave can be set.
+ */
+
+#include <common.h>
+#include <linux/delay.h>
+#include <linux/sizes.h>
+#include <asm/io.h>
+#include "ddr_ctrl.h"
+
+/* avoid warning for real pr_debug in <linux/printk.h> */
+#ifdef pr_debug
+#undef pr_debug
+#endif
+
+#ifdef DEBUG
+ #define pr_debug(fmt, args...) printf(fmt, ##args)
+ #define pr_debug2(fmt, args...) printf(fmt, ##args)
+#else
+ #define pr_debug(fmt, args...)
+ #define pr_debug2(fmt, args...)
+#endif
+
+#define DDR_NR_AXI_PORTS 4
+#define DDR_NR_ENTRIES 16
+
+#define DDR_START_REG (0) /* DENALI_CTL_00 */
+#define DDR_CS0_MR1_REG (32 * 4) /* DENALI_CTL_32 */
+#define DDR_CS0_MR2_REG (32 * 4 + 2) /* DENALI_CTL_32 */
+#define DDR_CS1_MR1_REG (34 * 4 + 2) /* DENALI_CTL_34 */
+#define DDR_CS1_MR2_REG (35 * 4) /* DENALI_CTL_35 */
+#define DDR_ECC_ENABLE_REG (36 * 4 + 2) /* DENALI_CTL_36 */
+#define DDR_ECC_DISABLE_W_UC_ERR_REG (37 * 4 + 2) /* DENALI_CTL_37 */
+#define DDR_HALF_DATAPATH_REG (54 * 4) /* DENALI_CTL_54 */
+#define DDR_INTERRUPT_STATUS (56 * 4) /* DENALI_CTL_56 */
+#define DDR_INTERRUPT_ACK (57 * 4) /* DENALI_CTL_57 */
+#define DDR_INTERRUPT_MASK (58 * 4) /* DENALI_CTL_58 */
+#define DDR_CS0_ODT_MAP_REG (62 * 4 + 2) /* DENALI_CTL_62 */
+#define DDR_CS1_ODT_MAP_REG (63 * 4) /* DENALI_CTL_63 */
+#define DDR_ODT_TODTL_2CMD (63 * 4 + 2) /* DENALI_CTL_63 */
+#define DDR_ODT_TODTH_WR (63 * 4 + 3) /* DENALI_CTL_63 */
+#define DDR_ODT_TODTH_RD (64 * 4 + 0) /* DENALI_CTL_64 */
+#define DDR_ODT_EN (64 * 4 + 1) /* DENALI_CTL_64 */
+#define DDR_ODT_WR_TO_ODTH (64 * 4 + 2) /* DENALI_CTL_64 */
+#define DDR_ODT_RD_TO_ODTH (64 * 4 + 3) /* DENALI_CTL_64 */
+#define DDR_DIFF_CS_DELAY_REG (66 * 4) /* DENALI_CTL_66 */
+#define DDR_SAME_CS_DELAY_REG (67 * 4) /* DENALI_CTL_67 */
+#define DDR_RW_PRIORITY_REGS (87 * 4 + 2) /* DENALI_CTL_87 */
+#define DDR_RW_FIFO_TYPE_REGS (88 * 4) /* DENALI_CTL_88 */
+#define DDR_AXI_PORT_PROT_ENABLE_REG (90 * 4 + 3) /* DENALI_CTL_90 */
+#define DDR_ADDR_RANGE_REGS (91 * 4) /* DENALI_CTL_91 */
+#define DDR_RANGE_PROT_REGS (218 * 4 + 2) /* DENALI_CTL_218 */
+#define DDR_ARB_CMD_Q_THRESHOLD_REG (346 * 4 + 2) /* DENALI_CTL_346 */
+#define DDR_AXI_PORT_BANDWIDTH_REG (346 * 4 + 3) /* DENALI_CTL_346 */
+#define DDR_OPT_RMODW_REG (372 * 4 + 3) /* DENALI_CTL_372 */
+
+static void ddrc_writeb(u8 val, void *p)
+{
+ pr_debug2("DDR: %p = 0x%02x\n", p, val);
+ writeb(val, p);
+}
+
+static void ddrc_writew(u16 val, void *p)
+{
+ pr_debug2("DDR: %p = 0x%04x\n", p, val);
+ writew(val, p);
+}
+
+static void ddrc_writel(u32 val, void *p)
+{
+ pr_debug2("DDR: %p = 0x%08x\n", p, val);
+ writel(val, p);
+}
+
+void cdns_ddr_set_mr1(void *base, int cs, u16 odt_impedance, u16 drive_strength)
+{
+ void *reg;
+ u16 tmp;
+
+ if (cs == 0)
+ reg = (u8 *)base + DDR_CS0_MR1_REG;
+ else
+ reg = (u8 *)base + DDR_CS1_MR1_REG;
+
+ tmp = readw(reg);
+
+ tmp &= ~MODE_REGISTER_MASK;
+ tmp |= MODE_REGISTER_MR1;
+
+ tmp &= ~MR1_ODT_IMPEDANCE_MASK;
+ tmp |= odt_impedance;
+
+ tmp &= ~MR1_DRIVE_STRENGTH_MASK;
+ tmp |= drive_strength;
+
+ writew(tmp, reg);
+}
+
+void cdns_ddr_set_mr2(void *base, int cs, u16 dynamic_odt, u16 self_refresh_temp)
+{
+ void *reg;
+ u16 tmp;
+
+ if (cs == 0)
+ reg = (u8 *)base + DDR_CS0_MR2_REG;
+ else
+ reg = (u8 *)base + DDR_CS1_MR2_REG;
+
+ tmp = readw(reg);
+
+ tmp &= ~MODE_REGISTER_MASK;
+ tmp |= MODE_REGISTER_MR2;
+
+ tmp &= ~MR2_DYNAMIC_ODT_MASK;
+ tmp |= dynamic_odt;
+
+ tmp &= ~MR2_SELF_REFRESH_TEMP_MASK;
+ tmp |= self_refresh_temp;
+
+ writew(tmp, reg);
+}
+
+void cdns_ddr_set_odt_map(void *base, int cs, u16 odt_map)
+{
+ void *reg;
+
+ if (cs == 0)
+ reg = (u8 *)base + DDR_CS0_ODT_MAP_REG;
+ else
+ reg = (u8 *)base + DDR_CS1_ODT_MAP_REG;
+
+ writew(odt_map, reg);
+}
+
+void cdns_ddr_set_odt_times(void *base, u8 TODTL_2CMD, u8 TODTH_WR, u8 TODTH_RD,
+ u8 WR_TO_ODTH, u8 RD_TO_ODTH)
+{
+ writeb(TODTL_2CMD, (u8 *)base + DDR_ODT_TODTL_2CMD);
+ writeb(TODTH_WR, (u8 *)base + DDR_ODT_TODTH_WR);
+ writeb(TODTH_RD, (u8 *)base + DDR_ODT_TODTH_RD);
+ writeb(1, (u8 *)base + DDR_ODT_EN);
+ writeb(WR_TO_ODTH, (u8 *)base + DDR_ODT_WR_TO_ODTH);
+ writeb(RD_TO_ODTH, (u8 *)base + DDR_ODT_RD_TO_ODTH);
+}
+
+void cdns_ddr_set_same_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w)
+{
+ u32 val = (w2w << 24) | (w2r << 16) | (r2w << 8) | r2r;
+
+ writel(val, (u8 *)base + DDR_SAME_CS_DELAY_REG);
+}
+
+void cdns_ddr_set_diff_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w)
+{
+ u32 val = (w2w << 24) | (w2r << 16) | (r2w << 8) | r2r;
+
+ writel(val, (u8 *)base + DDR_DIFF_CS_DELAY_REG);
+}
+
+void cdns_ddr_set_port_rw_priority(void *base, int port,
+ u8 read_pri, u8 write_pri)
+{
+ u8 *reg8 = (u8 *)base + DDR_RW_PRIORITY_REGS;
+
+ reg8 += (port * 3);
+ pr_debug("%s port %d (reg8=%p, DENALI_CTL_%d)\n",
+ __func__, port, reg8, (reg8 - (u8 *)base) / 4);
+
+ ddrc_writeb(read_pri, reg8++);
+ ddrc_writeb(write_pri, reg8++);
+}
+
+/* The DDR Controller has 16 entries. Each entry can specify an allowed address
+ * range (with 16KB resolution) for one of the 4 AXI slave ports.
+ */
+void cdns_ddr_enable_port_addr_range(void *base, int port, int entry,
+ u32 addr_start, u32 size)
+{
+ u32 addr_end;
+ u32 *reg32 = (u32 *)((u8 *)base + DDR_ADDR_RANGE_REGS);
+ u32 tmp;
+
+ reg32 += (port * DDR_NR_ENTRIES * 2);
+ reg32 += (entry * 2);
+ pr_debug("%s port %d, entry %d (reg32=%p, DENALI_CTL_%d)\n",
+ __func__, port, entry, reg32, ((u8 *)reg32 - (u8 *)base) / 4);
+
+ /* These registers represent 16KB address blocks */
+ addr_start /= SZ_16K;
+ size /= SZ_16K;
+ if (size)
+ addr_end = addr_start + size - 1;
+ else
+ addr_end = addr_start;
+
+ ddrc_writel(addr_start, reg32++);
+
+ /*
+ * end_addr: Ensure we only set the bottom 18-bits as DENALI_CTL_218
+ * also contains the AXI0 range protection bits.
+ */
+ tmp = readl(reg32);
+ tmp &= ~(BIT(18) - 1);
+ tmp |= addr_end;
+ ddrc_writel(tmp, reg32);
+}
+
+void cdns_ddr_enable_addr_range(void *base, int entry,
+ u32 addr_start, u32 size)
+{
+ int axi;
+
+ for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++)
+ cdns_ddr_enable_port_addr_range(base, axi, entry,
+ addr_start, size);
+}
+
+void cdns_ddr_enable_port_prot(void *base, int port, int entry,
+ enum cdns_ddr_range_prot range_protection_bits,
+ u16 range_RID_check_bits,
+ u16 range_WID_check_bits,
+ u8 range_RID_check_bits_ID_lookup,
+ u8 range_WID_check_bits_ID_lookup)
+{
+ /*
+ * Technically, the offset here points to the byte before the start of
+ * the range protection registers. However, all entries consist of 8
+ * bytes, except the first one (which is missing a padding byte) so we
+ * work around that subtlely.
+ */
+ u8 *reg8 = (u8 *)base + DDR_RANGE_PROT_REGS;
+
+ reg8 += (port * DDR_NR_ENTRIES * 8);
+ reg8 += (entry * 8);
+ pr_debug("%s port %d, entry %d (reg8=%p, DENALI_CTL_%d)\n",
+ __func__, port, entry, reg8, (reg8 - (u8 *)base) / 4);
+
+ if (port == 0 && entry == 0)
+ ddrc_writeb(range_protection_bits, reg8 + 1);
+ else
+ ddrc_writeb(range_protection_bits, reg8);
+
+ ddrc_writew(range_RID_check_bits, reg8 + 2);
+ ddrc_writew(range_WID_check_bits, reg8 + 4);
+ ddrc_writeb(range_RID_check_bits_ID_lookup, reg8 + 6);
+ ddrc_writeb(range_WID_check_bits_ID_lookup, reg8 + 7);
+}
+
+void cdns_ddr_enable_prot(void *base, int entry,
+ enum cdns_ddr_range_prot range_protection_bits,
+ u16 range_RID_check_bits,
+ u16 range_WID_check_bits,
+ u8 range_RID_check_bits_ID_lookup,
+ u8 range_WID_check_bits_ID_lookup)
+{
+ int axi;
+
+ for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++)
+ cdns_ddr_enable_port_prot(base, axi, entry,
+ range_protection_bits,
+ range_RID_check_bits,
+ range_WID_check_bits,
+ range_RID_check_bits_ID_lookup,
+ range_WID_check_bits_ID_lookup);
+}
+
+void cdns_ddr_set_port_bandwidth(void *base, int port,
+ u8 max_percent, u8 overflow_ok)
+{
+ u8 *reg8 = (u8 *)base + DDR_AXI_PORT_BANDWIDTH_REG;
+
+ reg8 += (port * 3);
+ pr_debug("%s port %d, (reg8=%p, DENALI_CTL_%d)\n",
+ __func__, port, reg8, (reg8 - (u8 *)base) / 4);
+
+ ddrc_writeb(max_percent, reg8++); /* Maximum bandwidth percentage */
+ ddrc_writeb(overflow_ok, reg8++); /* Bandwidth overflow allowed */
+}
+
+void cdns_ddr_ctrl_init(void *ddr_ctrl_basex, int async,
+ const u32 *reg0, const u32 *reg350,
+ u32 ddr_start_addr, u32 ddr_size,
+ int enable_ecc, int enable_8bit)
+{
+ int i, axi, entry;
+ u32 *ddr_ctrl_base = (u32 *)ddr_ctrl_basex;
+ u8 *base8 = (u8 *)ddr_ctrl_basex;
+
+ ddrc_writel(*reg0, ddr_ctrl_base + 0);
+ /* 1 to 6 are read only */
+ for (i = 7; i <= 26; i++)
+ ddrc_writel(*(reg0 + i), ddr_ctrl_base + i);
+ /* 27 to 29 are not changed */
+ for (i = 30; i <= 87; i++)
+ ddrc_writel(*(reg0 + i), ddr_ctrl_base + i);
+
+ /* Enable/disable ECC */
+ if (enable_ecc) {
+ pr_debug("%s enabling ECC\n", __func__);
+ ddrc_writeb(1, base8 + DDR_ECC_ENABLE_REG);
+ } else {
+ ddrc_writeb(0, base8 + DDR_ECC_ENABLE_REG);
+ }
+
+ /* ECC: Disable corruption for read/modify/write operations */
+ ddrc_writeb(1, base8 + DDR_ECC_DISABLE_W_UC_ERR_REG);
+
+ /* Set 8/16-bit data width using reduce bit (enable half datapath)*/
+ if (enable_8bit) {
+ pr_debug("%s using 8-bit data\n", __func__);
+ ddrc_writeb(1, base8 + DDR_HALF_DATAPATH_REG);
+ } else {
+ ddrc_writeb(0, base8 + DDR_HALF_DATAPATH_REG);
+ }
+
+ /* Threshold for command queue */
+ ddrc_writeb(4, base8 + DDR_ARB_CMD_Q_THRESHOLD_REG);
+
+ /* AXI port protection => enable */
+ ddrc_writeb(0x01, base8 + DDR_AXI_PORT_PROT_ENABLE_REG);
+
+ /* Set port interface type, default port priority and bandwidths */
+ for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++) {
+ /* port interface type: synchronous or asynchronous AXI clock */
+ u8 *fifo_reg = base8 + DDR_RW_FIFO_TYPE_REGS + (axi * 3);
+
+ if (async)
+ ddrc_writeb(0, fifo_reg);
+ else
+ ddrc_writeb(3, fifo_reg);
+
+ /* R/W priorities */
+ cdns_ddr_set_port_rw_priority(ddr_ctrl_base, axi, 2, 2);
+
+ /* AXI bandwidth */
+ cdns_ddr_set_port_bandwidth(ddr_ctrl_base, axi, 50, 1);
+ }
+
+ /*
+ * The hardware requires that the valid address ranges must not overlap.
+ * So, we initialise all address ranges to be above the DDR, length 0.
+ */
+ for (entry = 0; entry < DDR_NR_ENTRIES; entry++)
+ cdns_ddr_enable_addr_range(ddr_ctrl_base, entry,
+ ddr_start_addr + ddr_size, 0);
+
+ for (i = 350; i <= 374; i++)
+ ddrc_writel(*(reg350 - 350 + i), ddr_ctrl_base + i);
+
+ /* Disable optimised read-modify-write logic */
+ ddrc_writeb(0, base8 + DDR_OPT_RMODW_REG);
+
+ /*
+ * Disable all interrupts, we are not handling them.
+ * For detail of the interrupt mask, ack and status bits, see the
+ * manual's description of the 'int_status' parameter.
+ */
+ ddrc_writel(0, base8 + DDR_INTERRUPT_MASK);
+
+ /*
+ * Default settings to enable full access to the entire DDR.
+ * Users can set different ranges and access rights by calling these
+ * functions before calling cdns_ddr_ctrl_start().
+ */
+ cdns_ddr_enable_addr_range(ddr_ctrl_base, 0,
+ ddr_start_addr, ddr_size);
+ cdns_ddr_enable_prot(ddr_ctrl_base, 0, CDNS_DDR_RANGE_PROT_BITS_FULL,
+ 0xffff, 0xffff, 0x0f, 0x0f);
+}
+
+void cdns_ddr_ctrl_start(void *ddr_ctrl_basex)
+{
+ u32 *ddr_ctrl_base = (u32 *)ddr_ctrl_basex;
+ u8 *base8 = (u8 *)ddr_ctrl_basex;
+
+ /* Start */
+ ddrc_writeb(1, base8 + DDR_START_REG);
+
+ /* Wait for controller to be ready (interrupt status) */
+ while (!(readl(base8 + DDR_INTERRUPT_STATUS) & 0x100))
+ ;
+
+ /* clear all interrupts */
+ ddrc_writel(~0, base8 + DDR_INTERRUPT_ACK);
+
+ /* Step 19 Wait 500us from MRESETB=1 */
+ udelay(500);
+
+ /* Step 20 tCKSRX wait (From supply stable clock for MCK) */
+ /* DENALI_CTL_19 TREF_ENABLE=0x1(=1), AREFRESH=0x1(=1) */
+ ddrc_writel(0x01000100, ddr_ctrl_base + 19);
+}
diff --git a/drivers/ram/cadence/ddr_ctrl.h b/drivers/ram/cadence/ddr_ctrl.h
new file mode 100644
index 0000000000..77d7915b2b
--- /dev/null
+++ b/drivers/ram/cadence/ddr_ctrl.h
@@ -0,0 +1,175 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Cadence DDR Controller
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe Ltd
+ */
+
+#ifndef CADENCE_DDR_CTRL_H
+#define CADENCE_DDR_CTRL_H
+
+enum cdns_ddr_range_prot {
+ CDNS_DDR_RANGE_PROT_BITS_PRIV_SECURE = 0,
+ CDNS_DDR_RANGE_PROT_BITS_SECURE = 1,
+ CDNS_DDR_RANGE_PROT_BITS_PRIV = 2,
+ CDNS_DDR_RANGE_PROT_BITS_FULL = 3,
+};
+
+/**
+ * Initialise the Cadence DDR Controller, but doesn't start it.
+ *
+ * It sets up the controller so that all 4 AXI slave ports allow access to all
+ * of the DDR with the same settings. This means that:
+ * - Full access permisions.
+ * - All read/write priorities are set to 2.
+ * - Bandwidth is set to 50%, overflow is allowed, i.e. it's a soft limit.
+ * If you want different properties for different ports and/or addr ranges, call
+ * the other functions before calling cdns_ddr_ctrl_start().
+ *
+ * @ddr_ctrl_base Physical address of the DDR Controller.
+ * @async 0 if DDR clock is synchronous with the controller clock
+ * otherwise 1.
+ * @reg0 Pointer to array of 32-bit values to be written to registers
+ * 0 to 87. The values are generated by Cadence TCL scripts.
+ * @reg350 Pointer to array of 32-bit values to be written to registers
+ * 350 to 374. The values are generated by Cadence TCL scripts.
+ * @ddr_start_addr Physical address of the start of DDR.
+ * @ddr_size Size of the DDR in bytes. The controller will set the port
+ * protection range to match this size.
+ * @enable_ecc 0 to disable ECC, 1 to enable it.
+ * @enable_8bit 0 to use 16-bit bus width, 1 to use 8-bit bus width.
+ */
+void cdns_ddr_ctrl_init(void *ddr_ctrl_base, int async,
+ const u32 *reg0, const u32 *reg350,
+ u32 ddr_start_addr, u32 ddr_size,
+ int enable_ecc, int enable_8bit);
+
+/**
+ * Start the Cadence DDR Controller.
+ *
+ * @ddr_ctrl_base Physical address of the DDR Controller.
+ */
+void cdns_ddr_ctrl_start(void *ddr_ctrl_base);
+
+/**
+ * Set the priority for read and write operations for a specific AXI slave port.
+ *
+ * @base Physical address of the DDR Controller.
+ * @port Port number. Range is 0 to 3.
+ * @read_pri Priority for reads. Range is 0 to 3, where 0 is highest priority.
+ * @write_pri Priority for writes. Range is 0 to 3, where 0 is highest priority.
+ */
+void cdns_ddr_set_port_rw_priority(void *base, int port,
+ u8 read_pri, u8 write_pri);
+
+/**
+ * Specify address range for a protection entry, for a specific AXI slave port.
+ *
+ * @base Physical address of the DDR Controller.
+ * @port Port number. Range is 0 to 3.
+ * @entry The protection entry. Range is 0 to 15.
+ * @start_addr Physical of the address range, must be aligned to 16KB.
+ * @size Size of the address range, must be multiple of 16KB.
+ */
+void cdns_ddr_enable_port_addr_range(void *base, int port, int entry,
+ u32 addr_start, u32 size);
+
+/**
+ * Specify address range for a protection entry, for all AXI slave ports.
+ *
+ * @base Physical address of the DDR Controller.
+ * @entry The protection entry. Range is 0 to 15.
+ * @start_addr Physical of the address range, must be aligned to 16KB.
+ * @size Size of the address range, must be multiple of 16KB.
+ */
+void cdns_ddr_enable_addr_range(void *base, int entry,
+ u32 addr_start, u32 size);
+
+/**
+ * Specify protection entry details, for a specific AXI slave port.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base Physical address of the DDR Controller.
+ * @port Port number. Range is 0 to 3.
+ * @entry The protection entry. Range is 0 to 15.
+ */
+void cdns_ddr_enable_port_prot(void *base, int port, int entry,
+ enum cdns_ddr_range_prot range_protection_bits,
+ u16 range_RID_check_bits,
+ u16 range_WID_check_bits,
+ u8 range_RID_check_bits_ID_lookup,
+ u8 range_WID_check_bits_ID_lookup);
+
+/**
+ * Specify protection entry details, for all AXI slave ports.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base Physical address of the DDR Controller.
+ * @entry The protection entry. Range is 0 to 15.
+ */
+void cdns_ddr_enable_prot(void *base, int entry,
+ enum cdns_ddr_range_prot range_protection_bits,
+ u16 range_RID_check_bits,
+ u16 range_WID_check_bits,
+ u8 range_RID_check_bits_ID_lookup,
+ u8 range_WID_check_bits_ID_lookup);
+
+/**
+ * Specify bandwidth for each AXI port.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base Physical address of the DDR Controller.
+ * @port Port number. Range is 0 to 3.
+ * @max_percent 0 to 100.
+ */
+void cdns_ddr_set_port_bandwidth(void *base, int port,
+ u8 max_percent, u8 overflow_ok);
+
+/* Standard JEDEC registers */
+#define MODE_REGISTER_MASK (3 << 14)
+#define MODE_REGISTER_MR0 (0 << 14)
+#define MODE_REGISTER_MR1 (1 << 14)
+#define MODE_REGISTER_MR2 (2 << 14)
+#define MODE_REGISTER_MR3 (3 << 14)
+#define MR1_DRIVE_STRENGTH_MASK ((1 << 5) | (1 << 1))
+#define MR1_DRIVE_STRENGTH_34_OHMS ((0 << 5) | (1 << 1))
+#define MR1_DRIVE_STRENGTH_40_OHMS ((0 << 5) | (0 << 1))
+#define MR1_ODT_IMPEDANCE_MASK ((1 << 9) | (1 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_60_OHMS ((0 << 9) | (0 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_120_OHMS ((0 << 9) | (1 << 6) | (0 << 2))
+#define MR1_ODT_IMPEDANCE_40_OHMS ((0 << 9) | (1 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_20_OHMS ((1 << 9) | (0 << 6) | (0 << 2))
+#define MR1_ODT_IMPEDANCE_30_OHMS ((1 << 9) | (0 << 6) | (1 << 2))
+#define MR2_DYNAMIC_ODT_MASK (3 << 9)
+#define MR2_DYNAMIC_ODT_OFF (0 << 9)
+#define MR2_SELF_REFRESH_TEMP_MASK (1 << 7)
+#define MR2_SELF_REFRESH_TEMP_EXT (1 << 7)
+
+/**
+ * Set certain fields of the JEDEC MR1 register.
+ */
+void cdns_ddr_set_mr1(void *base, int cs, u16 odt_impedance, u16 drive_strength);
+
+/**
+ * Set certain fields of the JEDEC MR2 register.
+ */
+void cdns_ddr_set_mr2(void *base, int cs, u16 dynamic_odt, u16 self_refresh_temp);
+
+/**
+ * Set ODT map of the DDR Controller.
+ */
+void cdns_ddr_set_odt_map(void *base, int cs, u16 odt_map);
+
+/**
+ * Set ODT settings in the DDR Controller.
+ */
+void cdns_ddr_set_odt_times(void *base, u8 TODTL_2CMD, u8 TODTH_WR, u8 TODTH_RD,
+ u8 WR_TO_ODTH, u8 RD_TO_ODTH);
+
+void cdns_ddr_set_same_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w);
+void cdns_ddr_set_diff_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w);
+
+#endif
--
2.25.1