[PATCH v4 06/14] sifive: fu540: add ddr driver

Pragnesh Patel pragnesh.patel at sifive.com
Mon Feb 24 09:32:38 CET 2020


Add driver for fu540 to support ddr initialization in SPL.
This driver is based on FSBL
(https://github.com/sifive/freedom-u540-c000-bootloader.git)

Signed-off-by: Pragnesh Patel <pragnesh.patel at sifive.com>
---
 drivers/ram/Kconfig              |   7 +
 drivers/ram/Makefile             |   2 +
 drivers/ram/sifive/Kconfig       |   8 +
 drivers/ram/sifive/Makefile      |   6 +
 drivers/ram/sifive/sdram_fu540.c | 295 +++++++++++++++++++++++++++++++
 drivers/ram/sifive/sdram_fu540.h |  94 ++++++++++
 6 files changed, 412 insertions(+)
 create mode 100644 drivers/ram/sifive/Kconfig
 create mode 100644 drivers/ram/sifive/Makefile
 create mode 100644 drivers/ram/sifive/sdram_fu540.c
 create mode 100644 drivers/ram/sifive/sdram_fu540.h

diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index 56fea7c94c..c60c63204c 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -73,5 +73,12 @@ config IMXRT_SDRAM
 	  to support external memories like sdram, psram & nand.
 	  This driver is for the sdram memory interface with the SEMC.
 
+config SIFIVE_DDR
+	bool "Enable SiFive DDR support"
+	depends on RAM
+	help
+	  Enable support for the internal DDR Memory Controller of SiFive SoCs.
+
 source "drivers/ram/rockchip/Kconfig"
 source "drivers/ram/stm32mp1/Kconfig"
+source "drivers/ram/sifive/Kconfig"
diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile
index 5c897410c6..12bf61510b 100644
--- a/drivers/ram/Makefile
+++ b/drivers/ram/Makefile
@@ -17,3 +17,5 @@ obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
 obj-$(CONFIG_K3_J721E_DDRSS) += k3-j721e/
 
 obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o
+
+obj-$(CONFIG_SIFIVE_DDR) += sifive/
diff --git a/drivers/ram/sifive/Kconfig b/drivers/ram/sifive/Kconfig
new file mode 100644
index 0000000000..b754700db8
--- /dev/null
+++ b/drivers/ram/sifive/Kconfig
@@ -0,0 +1,8 @@
+config SIFIVE_FU540_DDR
+	bool "SiFive FU540 DDR driver"
+	depends on DM && OF_CONTROL
+	select RAM
+	select SPL_RAM if SPL
+	select SIFIVE_DDR
+	help
+	  This enables DDR support for the platforms based on SiFive FU540 SoC.
diff --git a/drivers/ram/sifive/Makefile b/drivers/ram/sifive/Makefile
new file mode 100644
index 0000000000..0187805199
--- /dev/null
+++ b/drivers/ram/sifive/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2020 SiFive, Inc
+#
+
+obj-$(CONFIG_SIFIVE_FU540_DDR) += sdram_fu540.o
diff --git a/drivers/ram/sifive/sdram_fu540.c b/drivers/ram/sifive/sdram_fu540.c
new file mode 100644
index 0000000000..18926dbe15
--- /dev/null
+++ b/drivers/ram/sifive/sdram_fu540.c
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * (C) Copyright 2020 SiFive, Inc.
+ *
+ * Authors:
+ *   Pragnesh Patel <pragnesh.patel at sifive.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <init.h>
+#include <ram.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include "sdram_fu540.h"
+
+/* n: Unit bytes */
+void sdram_copy_to_reg(volatile u32 *dest, volatile u32 *src, u32 n)
+{
+	int i;
+
+	for (i = 0; i < n / sizeof(u32); i++) {
+		writel(*src, dest);
+		src++;
+		dest++;
+	}
+}
+
+static void ddr_setuprangeprotection(volatile u32 *ctl, u64 end_addr)
+{
+	writel(0x0, DENALI_CTL_209 + ctl);
+	u32 end_addr_16kblocks = ((end_addr >> 14) & 0x7FFFFF) - 1;
+
+	writel(end_addr_16kblocks, DENALI_CTL_210 + ctl);
+	writel(0x0, DENALI_CTL_212 + ctl);
+	writel(0x0, DENALI_CTL_214 + ctl);
+	writel(0x0, DENALI_CTL_216 + ctl);
+	setbits_le32(DENALI_CTL_224 + ctl,
+		     0x3 << AXI0_RANGE_PROT_BITS_0_OFFSET);
+	writel(0xFFFFFFFF, DENALI_CTL_225 + ctl);
+	setbits_le32(DENALI_CTL_208 + ctl, 0x1 << AXI0_ADDRESS_RANGE_ENABLE);
+	setbits_le32(DENALI_CTL_208 + ctl,
+		     0x1 << PORT_ADDR_PROTECTION_EN_OFFSET);
+}
+
+static void ddr_start(volatile u32 *ctl, u32 *physical_filter_ctrl, u64 ddr_end)
+{
+	setbits_le32(DENALI_CTL_0 + ctl, 0x1);
+	while ((readl(DENALI_CTL_132 + ctl) & (1 << MC_INIT_COMPLETE_OFFSET))
+	       == 0) {
+	}
+
+	// Disable the BusBlocker in front of the controller AXI slave ports
+	volatile u64 *filterreg = (volatile u64 *)physical_filter_ctrl;
+
+	filterreg[0] = 0x0f00000000000000UL | (ddr_end >> 2);
+}
+
+static u64 ddr_phy_fixup(volatile u32 *ddrphyreg)
+{
+	// return bitmask of failed lanes
+
+	u64 fails     = 0;
+	u32 slicebase = 0;
+	u32 dq        = 0;
+
+	// check errata condition
+	for (u32 slice = 0; slice < 8; slice++) {
+		u32 regbase = slicebase + 34;
+
+		for (u32 reg = 0; reg < 4; reg++) {
+			u32 updownreg = readl(regbase + reg + ddrphyreg);
+
+			for (u32 bit = 0; bit < 2; bit++) {
+				u32 phy_rx_cal_dqn_0_offset;
+
+				if (bit == 0) {
+					phy_rx_cal_dqn_0_offset =
+						PHY_RX_CAL_DQ0_0_OFFSET;
+				} else {
+					phy_rx_cal_dqn_0_offset =
+						PHY_RX_CAL_DQ1_0_OFFSET;
+				}
+
+				u32 down = (updownreg >>
+					    phy_rx_cal_dqn_0_offset) & 0x3F;
+				u32 up   = (updownreg >>
+					    (phy_rx_cal_dqn_0_offset + 6)) &
+					    0x3F;
+
+				u8 failc0 = ((down == 0) && (up == 0x3F));
+				u8 failc1 = ((up == 0) && (down == 0x3F));
+
+				// print error message on failure
+				if (failc0 || failc1) {
+					if (fails == 0)
+						printf("DDR error in fixing up\n");
+
+					fails |= (1 << dq);
+
+					char slicelsc = '0';
+					char slicemsc = '0';
+
+					slicelsc += (dq % 10);
+					slicemsc += (dq / 10);
+					printf("S ");
+					printf("%c", slicemsc);
+					printf("%c", slicelsc);
+
+					if (failc0)
+						printf("U");
+					else
+						printf("D");
+
+					printf("\n");
+				}
+				dq++;
+			}
+		}
+		slicebase += 128;
+	}
+	return(0);
+}
+
+static u32 ddr_getdramclass(volatile u32 *ctl)
+{
+	u32 reg = readl(DENALI_CTL_0 + ctl);
+
+	return ((reg >> DRAM_CLASS_OFFSET) & 0xF);
+}
+
+static __maybe_unused int fu540_ddr_setup(struct udevice *dev)
+{
+	struct ddr_info *priv = dev_get_priv(dev);
+	struct sifive_dmc_plat *plat = dev_get_platdata(dev);
+
+	int ret, i;
+	u32 physet;
+
+	volatile u32 *denali_ctl =  &priv->ctl->denali_ctl[0];
+	volatile u32 *denali_phy =  &priv->phy->denali_phy[0];
+
+	ret = dev_read_u32_array(dev, "sifive,sdram-params",
+				 (u32 *)&plat->sdram_params,
+				 sizeof(plat->sdram_params) / sizeof(u32));
+	if (ret) {
+		printf("%s: Cannot read sifive,sdram-params %d\n",
+		       __func__, ret);
+		return ret;
+	}
+
+	struct fu540_sdram_params *params = &plat->sdram_params;
+
+	sdram_copy_to_reg(&priv->ctl->denali_ctl[0],
+			  &params->pctl_regs.denali_ctl[0],
+			  sizeof(struct fu540_ddrctl));
+
+	/* phy reset */
+	for (i = DENALI_PHY_1152; i <= DENALI_PHY_1214; i++) {
+		physet = params->phy_regs.denali_phy[i];
+		priv->phy->denali_phy[i] = physet;
+	}
+
+	for (i = 0; i < DENALI_PHY_1152; i++) {
+		physet = params->phy_regs.denali_phy[i];
+		priv->phy->denali_phy[i] = physet;
+	}
+
+	/* Disable read interleave DENALI_CTL_120 */
+	setbits_le32(DENALI_CTL_120 + denali_ctl,
+		     1 << DISABLE_RD_INTERLEAVE_OFFSET);
+
+	/* Disable optimal read/modify/write logic DENALI_CTL_21 */
+	clrbits_le32(DENALI_CTL_21 + denali_ctl, 1 << OPTIMAL_RMODW_EN_OFFSET);
+
+	/* Enable write Leveling DENALI_CTL_170 */
+	setbits_le32(DENALI_CTL_170 + denali_ctl, (1 << WRLVL_EN_OFFSET)
+		     | (1 << DFI_PHY_WRLELV_MODE_OFFSET));
+
+	/* Enable read leveling DENALI_CTL_181 and DENALI_CTL_260 */
+	setbits_le32(DENALI_CTL_181 + denali_ctl,
+		     1 << DFI_PHY_RDLVL_MODE_OFFSET);
+	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_EN_OFFSET);
+
+	/* Enable read leveling gate DENALI_CTL_260 and DENALI_CTL_182 */
+	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_GATE_EN_OFFSET);
+	setbits_le32(DENALI_CTL_182 + denali_ctl,
+		     1 << DFI_PHY_RDLVL_GATE_MODE_OFFSET);
+
+	if (ddr_getdramclass(denali_ctl) == DRAM_CLASS_DDR4) {
+		/* Enable vref training DENALI_CTL_184 */
+		setbits_le32(DENALI_CTL_184 + denali_ctl, 1 << VREF_EN_OFFSET);
+	}
+
+	/* Mask off leveling completion interrupt DENALI_CTL_136 */
+	setbits_le32(DENALI_CTL_136 + denali_ctl,
+		     1 << LEVELING_OPERATION_COMPLETED_OFFSET);
+
+	/* Mask off MC init complete interrupt DENALI_CTL_136 */
+	setbits_le32(DENALI_CTL_136 + denali_ctl, 1 << MC_INIT_COMPLETE_OFFSET);
+
+	/* Mask off out of range interrupts DENALI_CTL_136 */
+	setbits_le32(DENALI_CTL_136 + denali_ctl, (1 << OUT_OF_RANGE_OFFSET)
+		     | (1 << MULTIPLE_OUT_OF_RANGE_OFFSET));
+
+	/* set up range protection */
+	ddr_setuprangeprotection(denali_ctl, DDR_MEM_SIZE);
+
+	/* Mask off port command error interrupt DENALI_CTL_136 */
+	setbits_le32(DENALI_CTL_136 + denali_ctl,
+		     1 << PORT_COMMAND_CHANNEL_ERROR_OFFSET);
+
+	const u64 ddr_size = DDR_MEM_SIZE;
+	const u64 ddr_end = PAYLOAD_DEST + ddr_size;
+
+	ddr_start(denali_ctl, priv->physical_filter_ctrl, ddr_end);
+
+	ddr_phy_fixup(denali_phy);
+
+	/* check size */
+	priv->info.size = get_ram_size((long *)priv->info.base,
+				       DDR_MEM_SIZE);
+
+	printf("priv->info.size = %lx\n", priv->info.size);
+	debug("%s : %lx\n", __func__, priv->info.size);
+
+	/* check memory access for all memory */
+
+	if (priv->info.size != DDR_MEM_SIZE) {
+		printf("DDR invalid size : 0x%lx, expected 0x%lx\n",
+		       priv->info.size, DDR_MEM_SIZE);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int fu540_ddr_probe(struct udevice *dev)
+{
+	struct ddr_info *priv = dev_get_priv(dev);
+
+#if defined(CONFIG_SPL_BUILD)
+	struct regmap *map;
+	int ret;
+
+	debug("FU540 DDR probe\n");
+	priv->dev = dev;
+
+	ret = regmap_init_mem(dev_ofnode(dev), &map);
+	if (ret)
+		return ret;
+
+	priv->ctl = regmap_get_range(map, 0);
+	priv->phy = regmap_get_range(map, 1);
+	priv->physical_filter_ctrl = regmap_get_range(map, 2);
+
+	priv->info.base = CONFIG_SYS_SDRAM_BASE;
+
+	priv->info.size = 0;
+	return fu540_ddr_setup(dev);
+#else
+	priv->info.base = CONFIG_SYS_SDRAM_BASE;
+	priv->info.size = DDR_MEM_SIZE;
+#endif
+	return 0;
+}
+
+static int fu540_ddr_get_info(struct udevice *dev, struct ram_info *info)
+{
+	struct ddr_info *priv = dev_get_priv(dev);
+
+	*info = priv->info;
+
+	return 0;
+}
+
+static struct ram_ops fu540_ddr_ops = {
+	.get_info = fu540_ddr_get_info,
+};
+
+static const struct udevice_id fu540_ddr_ids[] = {
+	{ .compatible = "sifive,fu540-ddr" },
+	{ }
+};
+
+U_BOOT_DRIVER(fu540_ddr) = {
+	.name = "fu540_ddr",
+	.id = UCLASS_RAM,
+	.of_match = fu540_ddr_ids,
+	.ops = &fu540_ddr_ops,
+	.probe = fu540_ddr_probe,
+	.priv_auto_alloc_size = sizeof(struct ddr_info),
+	.platdata_auto_alloc_size = sizeof(struct sifive_dmc_plat),
+};
diff --git a/drivers/ram/sifive/sdram_fu540.h b/drivers/ram/sifive/sdram_fu540.h
new file mode 100644
index 0000000000..09693a038e
--- /dev/null
+++ b/drivers/ram/sifive/sdram_fu540.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
+/*
+ * Copyright (C) 2020, SiFive, Inc
+ *
+ * Authors:
+ *   Pragnesh Patel <pragnesh.patel at sifive.com>
+ */
+
+#define DENALI_CTL_0	0
+#define DENALI_CTL_21	21
+#define DENALI_CTL_120	120
+#define DENALI_CTL_132	132
+#define DENALI_CTL_136	136
+#define DENALI_CTL_170	170
+#define DENALI_CTL_181	181
+#define DENALI_CTL_182	182
+#define DENALI_CTL_184	184
+#define DENALI_CTL_208	208
+#define DENALI_CTL_209	209
+#define DENALI_CTL_210	210
+#define DENALI_CTL_212	212
+#define DENALI_CTL_214	214
+#define DENALI_CTL_216	216
+#define DENALI_CTL_224	224
+#define DENALI_CTL_225	225
+#define DENALI_CTL_260	260
+
+#define DENALI_PHY_1152	1152
+#define DENALI_PHY_1214	1214
+
+#define PAYLOAD_DEST	0x80000000
+#define DDR_MEM_SIZE	(8UL * 1024UL * 1024UL * 1024UL)
+
+#define DRAM_CLASS_OFFSET                   8
+#define DRAM_CLASS_DDR4                     0xA
+#define OPTIMAL_RMODW_EN_OFFSET             0
+#define DISABLE_RD_INTERLEAVE_OFFSET        16
+#define OUT_OF_RANGE_OFFSET                 1
+#define MULTIPLE_OUT_OF_RANGE_OFFSET        2
+#define PORT_COMMAND_CHANNEL_ERROR_OFFSET   7
+#define MC_INIT_COMPLETE_OFFSET             8
+#define LEVELING_OPERATION_COMPLETED_OFFSET 22
+#define DFI_PHY_WRLELV_MODE_OFFSET          24
+#define DFI_PHY_RDLVL_MODE_OFFSET           24
+#define DFI_PHY_RDLVL_GATE_MODE_OFFSET      0
+#define VREF_EN_OFFSET                      24
+#define PORT_ADDR_PROTECTION_EN_OFFSET      0
+#define AXI0_ADDRESS_RANGE_ENABLE           8
+#define AXI0_RANGE_PROT_BITS_0_OFFSET       24
+#define RDLVL_EN_OFFSET                     16
+#define RDLVL_GATE_EN_OFFSET                24
+#define WRLVL_EN_OFFSET                     0
+
+#define PHY_RX_CAL_DQ0_0_OFFSET             0
+#define PHY_RX_CAL_DQ1_0_OFFSET             16
+
+struct fu540_ddrctl {
+	volatile u32 denali_ctl[265];
+};
+
+struct fu540_ddrphy {
+	volatile u32 denali_phy[1215];
+};
+
+struct fu540_sdram_params {
+	struct fu540_ddrctl pctl_regs;
+	struct fu540_ddrphy phy_regs;
+};
+
+struct sifive_dmc_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_sifive_fu540_dmc dtplat;
+#else
+	struct fu540_sdram_params sdram_params;
+#endif
+};
+
+/**
+ * struct ddr_info
+ *
+ * @dev				: pointer for the device
+ * @info			: UCLASS RAM information
+ * @ctl				: DDR controleur base address
+ * @phy				: DDR PHY base address
+ * @ctrl			: DDR control base address
+ * @physical_filter_ctrl	: DDR physical filter control base address
+ */
+struct ddr_info {
+	struct udevice *dev;
+	struct ram_info info;
+	struct fu540_ddrctl *ctl;
+	struct fu540_ddrphy *phy;
+	u32 *physical_filter_ctrl;
+};
-- 
2.17.1



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