[PATCH 2/2] spi: Add support for Cadence XSPI controller
From: Konrad Kociolek
Date: Mon Jan 20 2020 - 07:56:05 EST
Add support for Cadence XSPI controller. This driver uses SPI-MEM
framework and is capable to operate with single, dual, quad and octal
SPI-NOR memories. Low-level controller work mode (STIG) is utilized
to communicate with flash memories.
Signed-off-by: Konrad Kociolek <konrad@xxxxxxxxxxx>
---
drivers/spi/Kconfig | 11 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-cadence-xspi.c | 895 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 907 insertions(+)
create mode 100644 drivers/spi/spi-cadence-xspi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f761655..11b058b 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -848,6 +848,17 @@ config SPI_ZYNQMP_GQSPI
help
Enables Xilinx GQSPI controller driver for Zynq UltraScale+ MPSoC.
+config SPI_CADENCE_XSPI
+ tristate "Cadence XSPI controller"
+ depends on (OF || COMPILE_TEST) && HAS_IOMEM
+ help
+ Enable support for the Cadence XSPI Flash controller.
+
+ Cadence XSPI is a specialized controller for connecting an SPI
+ Flash over upto 8bit wide bus. Enable this option if you have a
+ device with a Cadence XSPI controller and want to access the
+ Flash as an MTD device.
+
#
# Add new SPI master controllers in alphabetical order above this line
#
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index d8fc03c..fed59a4 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
obj-$(CONFIG_SPI_XLP) += spi-xlp.o
obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o
obj-$(CONFIG_SPI_ZYNQMP_GQSPI) += spi-zynqmp-gqspi.o
+obj-$(CONFIG_SPI_CADENCE_XSPI) += spi-cadence-xspi.o
# SPI slave protocol handlers
obj-$(CONFIG_SPI_SLAVE_TIME) += spi-slave-time.o
diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
new file mode 100644
index 0000000..d595846
--- /dev/null
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -0,0 +1,895 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cadence XSPI flash controller driver
+ *
+ * Copyright (C) 2020 Cadence
+ *
+ * Author: Konrad Kociolek <konrad@xxxxxxxxxxx>
+ */
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/spi/spi.h>
+#include <linux/mtd/spi-nor.h>
+#include <linux/bitfield.h>
+#include <linux/limits.h>
+#include <linux/log2.h>
+
+#define CDNS_XSPI_MAGIC_NUM_VALUE 0x6522
+#define CDNS_XSPI_MAX_BANKS 8
+#define CDNS_XSPI_NAME "cadence-xspi"
+
+/*
+ * Note: below are additional auxiliary registers to
+ * configure XSPI controller pin-strap settings
+ */
+
+/* PHY DQ timing register */
+#define CDNS_XSPI_CCP_PHY_DQ_TIMING 0x0000
+#define CDNS_XSPI_CCP_DATA_SELECT_OE_START GENMASK(6, 4)
+#define CDNS_XSPI_CCP_DATA_SELECT_OE_END GENMASK(2, 0)
+#define CDNS_XSPI_CCP_PHY_DQ_TIMING_INIT_VAL 0x80000000
+
+/* PHY DQS timing register */
+#define CDNS_XSPI_CCP_PHY_DQS_TIMING 0x0004
+#define CDNS_XSPI_CCP_USE_EXT_LPBCK_DQS BIT(22)
+#define CDNS_XSPI_CCP_USE_LPBCK_DQS BIT(21)
+#define CDNS_XSPI_CCP_USE_PHONY BIT(20)
+#define CDNS_XSPI_CCP_DQS_SELECT_OE_START GENMASK(7, 4)
+#define CDNS_XSPI_CCP_DQS_SELECT_OE_END GENMASK(3, 0)
+
+/* PHY gate loopback control register */
+#define CDNS_XSPI_CCP_PHY_GATE_LPBCK_CTRL 0x0008
+#define CDNS_XSPI_CCP_READ_DATA_DELAY_SEL GENMASK(24, 19)
+#define CDNS_XSPI_CCP_GATE_CFG_CLOSE GENMASK(5, 4)
+#define CDNS_XSPI_CCP_GATE_CFG GENMASK(3, 0)
+
+/* PHY DLL slave control register */
+#define CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL 0x0010
+#define CDNS_XSPI_CCP_CLK_WR_DELAY GENMASK(15, 8)
+#define CDNS_XSPI_CCP_READ_DQS_DELAY GENMASK(7, 0)
+
+#define CDNS_XSPI_AUX_PHY_ADDONS_REG 0x0040
+#define CDNS_XSPI_AUX_PHY_ADDONS_VALUE 0xE0012000
+#define CDNS_XSPI_AUX_DEV_DISC_CONFIG_REG 0x0048
+#define CDNS_XSPI_AUX_DEV_DISC_CONFIG_VALUE 0x00000000
+#define CDNS_XSPI_AUX_DRIVING_REG 0x0050
+#define CDNS_XSPI_AUX_CTRL_RESET BIT(0)
+
+/* DLL PHY control register */
+#define CDNS_XSPI_DLL_PHY_CTRL 0x1034
+#define CDNS_XSPI_CCP_DQS_LAST_DATA_DROP_EN BIT(20)
+
+/* Command registers */
+#define CDNS_XSPI_CMD_REG_0 0x0000
+#define CDNS_XSPI_CMD_REG_1 0x0004
+#define CDNS_XSPI_CMD_REG_2 0x0008
+#define CDNS_XSPI_CMD_REG_3 0x000C
+#define CDNS_XSPI_CMD_REG_4 0x0010
+#define CDNS_XSPI_CMD_REG_5 0x0014
+
+/* Command status registers */
+#define CDNS_XSPI_CMD_STATUS_REG 0x0044
+#define CDNS_XSPI_CMD_COMPLETED BIT(15)
+#define CDNS_XSPI_CMD_FAILED BIT(14)
+
+/* Controller status register */
+#define CDNS_XSPI_CTRL_STATUS_REG 0x0100
+#define CDNS_XSPI_INIT_COMPLETED BIT(16)
+#define CDNS_XSPI_INIT_LEGACY BIT(9)
+#define CDNS_XSPI_INIT_FAIL BIT(8)
+#define CDNS_XSPI_CTRL_BUSY BIT(7)
+
+/* Controller interrupt status register */
+#define CDNS_XSPI_INTR_STATUS_REG 0x0110
+#define CDNS_XSPI_STIG_DONE BIT(23)
+#define CDNS_XSPI_SDMA_ERROR BIT(22)
+#define CDNS_XSPI_SDMA_TRIGGER BIT(21)
+
+/* Controller interrupt enable register */
+#define CDNS_XSPI_INTR_ENABLE_REG 0x0114
+#define CDNS_XSPI_INTR_EN BIT(31)
+#define CDNS_XSPI_STIG_DONE_EN BIT(23)
+#define CDNS_XSPI_SDMA_ERROR_EN BIT(22)
+#define CDNS_XSPI_SDMA_TRIGGER_EN BIT(21)
+
+#define CDNS_XSPI_INTR_MASK (CDNS_XSPI_INTR_EN | \
+ CDNS_XSPI_STIG_DONE_EN | \
+ CDNS_XSPI_SDMA_ERROR_EN | \
+ CDNS_XSPI_SDMA_TRIGGER_EN)
+
+/* Controller config register */
+#define CDNS_XSPI_CTRL_CONFIG_REG 0x0230
+#define CDNS_XSPI_CTRL_WORK_MODE GENMASK(6, 5)
+
+/* SDMA trigger transaction registers */
+#define CDNS_XSPI_SDMA_SIZE_REG 0x0240
+#define CDNS_XSPI_SDMA_TRD_INFO_REG 0x0244
+#define CDNS_XSPI_SDMA_DIR BIT(8)
+
+/* Controller features register */
+#define CDNS_XSPI_CTRL_FEATURES_REG 0x0F04
+#define CDNS_XSPI_NUM_BANKS GENMASK(25, 24)
+#define CDNS_XSPI_DMA_DATA_WIDTH BIT(21)
+#define CDNS_XSPI_NUM_THREADS GENMASK(3, 0)
+
+/* Controller version register */
+#define CDNS_XSPI_CTRL_VERSION_REG 0x0F00
+#define CDNS_XSPI_MAGIC_NUM GENMASK(31, 16)
+#define CDNS_XSPI_CTRL_REV GENMASK(7, 0)
+
+/* STIG Profile 1.0 instruction fields (split into registers) */
+#define CDNS_XSPI_CMD_INSTR_TYPE GENMASK(6, 0)
+#define CDNS_XSPI_CMD_P1_R1_ADDR0 GENMASK(31, 24)
+#define CDNS_XSPI_CMD_P1_R2_ADDR1 GENMASK(7, 0)
+#define CDNS_XSPI_CMD_P1_R2_ADDR2 GENMASK(15, 8)
+#define CDNS_XSPI_CMD_P1_R2_ADDR3 GENMASK(23, 16)
+#define CDNS_XSPI_CMD_P1_R2_ADDR4 GENMASK(31, 24)
+#define CDNS_XSPI_CMD_P1_R3_ADDR5 GENMASK(7, 0)
+#define CDNS_XSPI_CMD_P1_R3_CMD GENMASK(23, 16)
+#define CDNS_XSPI_CMD_P1_R3_NUM_ADDR_BYTES GENMASK(30, 28)
+#define CDNS_XSPI_CMD_P1_R4_ADDR_IOS GENMASK(1, 0)
+#define CDNS_XSPI_CMD_P1_R4_CMD_IOS GENMASK(9, 8)
+#define CDNS_XSPI_CMD_P1_R4_BANK GENMASK(14, 12)
+
+/* STIG data sequence instruction fields (split into registers) */
+#define CDNS_XSPI_CMD_DSEQ_R2_DCNT_L GENMASK(31, 16)
+#define CDNS_XSPI_CMD_DSEQ_R3_DCNT_H GENMASK(15, 0)
+#define CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY GENMASK(25, 20)
+#define CDNS_XSPI_CMD_DSEQ_R4_BANK GENMASK(14, 12)
+#define CDNS_XSPI_CMD_DSEQ_R4_DATA_IOS GENMASK(9, 8)
+#define CDNS_XSPI_CMD_DSEQ_R4_DIR BIT(4)
+
+/* STIG command status fields */
+#define CDNS_XSPI_CMD_STATUS_COMPLETED BIT(15)
+#define CDNS_XSPI_CMD_STATUS_FAILED BIT(14)
+#define CDNS_XSPI_CMD_STATUS_DQS_ERROR BIT(3)
+#define CDNS_XSPI_CMD_STATUS_CRC_ERROR BIT(2)
+#define CDNS_XSPI_CMD_STATUS_BUS_ERROR BIT(1)
+#define CDNS_XSPI_CMD_STATUS_INV_SEQ_ERROR BIT(0)
+
+#define CDNS_XSPI_CTRL_WORK_MODE_STIG 0x01
+
+#define CDNS_XSPI_STIG_DONE_FLAG BIT(0)
+
+/* Helper macros for filling command registers */
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_1(op, data_phase) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_INSTR_TYPE, (data_phase) ? \
+ CDNS_XSPI_STIG_INSTR_TYPE_1 : CDNS_XSPI_STIG_INSTR_TYPE_0) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R1_ADDR0, op->addr.val & 0xff))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_2(op) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR1, (op->addr.val >> 8) & 0xFF) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR2, (op->addr.val >> 16) & 0xFF) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR3, (op->addr.val >> 24) & 0xFF) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR4, (op->addr.val >> 32) & 0xFF))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_3(op) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R3_ADDR5, (op->addr.val >> 40) & 0xFF) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R3_CMD, op->cmd.opcode) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R3_NUM_ADDR_BYTES, op->addr.nbytes))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_4(op, chipsel) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R4_ADDR_IOS, ilog2(op->addr.buswidth)) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R4_CMD_IOS, ilog2(op->cmd.buswidth)) | \
+ FIELD_PREP(CDNS_XSPI_CMD_P1_R4_BANK, chipsel))
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_1(op) \
+ FIELD_PREP(CDNS_XSPI_CMD_INSTR_TYPE, CDNS_XSPI_STIG_INSTR_TYPE_DATA_SEQ)
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_2(op) \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R2_DCNT_L, op->data.nbytes & 0xFFFF)
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_3(op) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_DCNT_H, \
+ (op->data.nbytes >> 16) & 0xffff) | \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY, op->dummy.nbytes * 8))
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_4(op, chipsel) ( \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_BANK, chipsel) | \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_DATA_IOS, ilog2(op->data.buswidth)) | \
+ FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_DIR, \
+ (op->data.dir == SPI_MEM_DATA_IN) ? \
+ CDNS_XSPI_STIG_CMD_DIR_READ : CDNS_XSPI_STIG_CMD_DIR_WRITE))
+
+enum cdns_xspi_stig_instr_type {
+ CDNS_XSPI_STIG_INSTR_TYPE_0,
+ CDNS_XSPI_STIG_INSTR_TYPE_1,
+ CDNS_XSPI_STIG_INSTR_TYPE_DATA_SEQ = 127,
+};
+
+enum cdns_xspi_sdma_dir {
+ CDNS_XSPI_SDMA_DIR_READ,
+ CDNS_XSPI_SDMA_DIR_WRITE,
+};
+
+enum cdns_xspi_stig_cmd_dir {
+ CDNS_XSPI_STIG_CMD_DIR_READ,
+ CDNS_XSPI_STIG_CMD_DIR_WRITE,
+};
+
+struct cdns_xspi_platform_data {
+ u32 phy_data_sel_oe_start;
+ u32 phy_data_sel_oe_end;
+ u32 phy_dqs_sel_oe_start;
+ u32 phy_dqs_sel_oe_end;
+ u32 phy_gate_cfg_close;
+ u32 phy_gate_cfg;
+ u32 phy_rd_del_sel;
+ u32 clk_wr_delay;
+ bool dqs_last_data_drop;
+ bool use_lpbk_dqs;
+ bool use_ext_lpbk_dqs;
+};
+
+struct cdns_xspi_dev {
+ struct platform_device *pdev;
+ struct device *dev;
+
+ void __iomem *iobase;
+ void __iomem *auxbase;
+ void __iomem *sdmabase;
+
+ int irq;
+ int current_cs;
+
+ struct mutex lock;
+
+ struct completion cmd_complete;
+ struct completion sdma_complete;
+ bool sdma_error;
+
+ void *in_buffer;
+ const void *out_buffer;
+
+ u8 hw_num_banks;
+
+ struct cdns_xspi_platform_data *plat_data;
+};
+
+static void cdns_xspi_controller_reset(struct cdns_xspi_dev *cdns_xspi)
+{
+ u32 driving_reg = 0;
+
+ driving_reg = readl(cdns_xspi->auxbase + CDNS_XSPI_AUX_DRIVING_REG);
+ driving_reg |= CDNS_XSPI_AUX_CTRL_RESET;
+ writel(driving_reg, cdns_xspi->auxbase + CDNS_XSPI_AUX_DRIVING_REG);
+
+ udelay(10);
+
+ driving_reg &= ~CDNS_XSPI_AUX_CTRL_RESET;
+ writel(driving_reg, cdns_xspi->auxbase + CDNS_XSPI_AUX_DRIVING_REG);
+}
+
+static int cdns_xspi_read_dqs_delay_training(struct cdns_xspi_dev *cdns_xspi)
+{
+ int rd_dqs_del;
+ int rd_dqs_del_min = -1;
+ int rd_dqs_del_max = -1;
+
+ u32 phy_dll_slave_ctrl = 0;
+ u32 ctrl_status = 0;
+
+ phy_dll_slave_ctrl = readl(cdns_xspi->auxbase +
+ CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL);
+
+ dev_info(cdns_xspi->dev,
+ "Running PHY training for read_dqs_delay parameter\n");
+
+ for (rd_dqs_del = 0; rd_dqs_del < U8_MAX; rd_dqs_del++) {
+ phy_dll_slave_ctrl &= ~CDNS_XSPI_CCP_READ_DQS_DELAY;
+ phy_dll_slave_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_READ_DQS_DELAY,
+ rd_dqs_del);
+
+ writel(phy_dll_slave_ctrl,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL);
+
+ cdns_xspi_controller_reset(cdns_xspi);
+
+ readl_relaxed_poll_timeout(cdns_xspi->iobase +
+ CDNS_XSPI_CTRL_STATUS_REG, ctrl_status,
+ (ctrl_status & CDNS_XSPI_INIT_COMPLETED), 10, 10000);
+
+ if (!(ctrl_status & CDNS_XSPI_INIT_COMPLETED) ||
+ (ctrl_status & CDNS_XSPI_INIT_FAIL)) {
+ if (rd_dqs_del_min != -1)
+ rd_dqs_del_max = rd_dqs_del - 1;
+ } else {
+ if (rd_dqs_del_min == -1)
+ rd_dqs_del_min = rd_dqs_del;
+ }
+ }
+
+ if (rd_dqs_del_min == -1) {
+ dev_err(cdns_xspi->dev, "PHY training failed\n");
+ return -EBUSY;
+ } else if (rd_dqs_del_max == -1) {
+ rd_dqs_del_max = U8_MAX;
+ }
+
+ rd_dqs_del = rd_dqs_del_min + rd_dqs_del_max / 2;
+ dev_info(cdns_xspi->dev,
+ "Using optimal read_dqs_delay value: %d\n", rd_dqs_del);
+
+ phy_dll_slave_ctrl &= ~CDNS_XSPI_CCP_READ_DQS_DELAY;
+ phy_dll_slave_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_READ_DQS_DELAY,
+ rd_dqs_del);
+
+ writel(phy_dll_slave_ctrl,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL);
+
+ return 0;
+}
+
+static int cdns_xspi_phy_init(struct cdns_xspi_dev *cdns_xspi)
+{
+ u32 xspi_dll_phy_ctrl = 0;
+ u32 phy_dq_timing = CDNS_XSPI_CCP_PHY_DQ_TIMING_INIT_VAL;
+ u32 phy_dqs_timing = 0;
+ u32 phy_gate_lpbck_ctrl = 0;
+ u32 phy_dll_slave_ctrl = 0;
+
+ if (cdns_xspi->plat_data->use_lpbk_dqs) {
+ phy_dqs_timing |= FIELD_PREP(CDNS_XSPI_CCP_USE_LPBCK_DQS, 1);
+
+ /*
+ * For XSPI protocol, phony_dqs and lpbk_dqs must
+ * have same value
+ */
+ phy_dqs_timing |= FIELD_PREP(CDNS_XSPI_CCP_USE_PHONY, 1);
+
+ if (cdns_xspi->plat_data->use_ext_lpbk_dqs)
+ phy_dqs_timing |=
+ FIELD_PREP(CDNS_XSPI_CCP_USE_EXT_LPBCK_DQS, 1);
+ }
+
+ xspi_dll_phy_ctrl = readl(cdns_xspi->auxbase + CDNS_XSPI_DLL_PHY_CTRL);
+
+ /* While using memory DQS last_data_drop parameter should be enabled */
+ if (cdns_xspi->plat_data->dqs_last_data_drop)
+ xspi_dll_phy_ctrl |=
+ FIELD_PREP(CDNS_XSPI_CCP_DQS_LAST_DATA_DROP_EN, 1);
+
+ phy_dq_timing |= FIELD_PREP(CDNS_XSPI_CCP_DATA_SELECT_OE_START,
+ cdns_xspi->plat_data->phy_data_sel_oe_start);
+ phy_dq_timing |= FIELD_PREP(CDNS_XSPI_CCP_DATA_SELECT_OE_END,
+ cdns_xspi->plat_data->phy_data_sel_oe_end);
+
+ phy_dqs_timing |= FIELD_PREP(CDNS_XSPI_CCP_DQS_SELECT_OE_START,
+ cdns_xspi->plat_data->phy_dqs_sel_oe_start);
+ phy_dqs_timing |= FIELD_PREP(CDNS_XSPI_CCP_DQS_SELECT_OE_END,
+ cdns_xspi->plat_data->phy_dqs_sel_oe_end);
+
+ phy_gate_lpbck_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_GATE_CFG_CLOSE,
+ cdns_xspi->plat_data->phy_gate_cfg_close);
+ phy_gate_lpbck_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_GATE_CFG,
+ cdns_xspi->plat_data->phy_gate_cfg);
+ phy_gate_lpbck_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_READ_DATA_DELAY_SEL,
+ cdns_xspi->plat_data->phy_rd_del_sel);
+
+ phy_dll_slave_ctrl |= FIELD_PREP(CDNS_XSPI_CCP_CLK_WR_DELAY,
+ cdns_xspi->plat_data->clk_wr_delay);
+
+ writel(xspi_dll_phy_ctrl,
+ cdns_xspi->auxbase + CDNS_XSPI_DLL_PHY_CTRL);
+ writel(phy_dq_timing,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQ_TIMING);
+ writel(phy_dqs_timing,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQS_TIMING);
+ writel(phy_gate_lpbck_ctrl,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_GATE_LPBCK_CTRL);
+ writel(phy_dll_slave_ctrl,
+ cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL);
+
+ writel(CDNS_XSPI_AUX_PHY_ADDONS_VALUE,
+ cdns_xspi->auxbase + CDNS_XSPI_AUX_PHY_ADDONS_REG);
+ writel(CDNS_XSPI_AUX_DEV_DISC_CONFIG_VALUE,
+ cdns_xspi->auxbase + CDNS_XSPI_AUX_DEV_DISC_CONFIG_REG);
+
+ return cdns_xspi_read_dqs_delay_training(cdns_xspi);
+}
+
+static int cdns_xspi_wait_for_controller_idle(struct cdns_xspi_dev *cdns_xspi)
+{
+ u32 ctrl_stat;
+
+ return readl_relaxed_poll_timeout(cdns_xspi->iobase +
+ CDNS_XSPI_CTRL_STATUS_REG,
+ ctrl_stat, ((ctrl_stat & CDNS_XSPI_CTRL_BUSY) == 0), 100, 1000);
+}
+
+static void cdns_xspi_trigger_command(struct cdns_xspi_dev *cdns_xspi,
+ u32 cmd_regs[5])
+{
+ writel(cmd_regs[5], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_5);
+ writel(cmd_regs[4], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_4);
+ writel(cmd_regs[3], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_3);
+ writel(cmd_regs[2], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_2);
+ writel(cmd_regs[1], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_1);
+ writel(cmd_regs[0], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_0);
+}
+
+static int cdns_xspi_check_command_status(struct cdns_xspi_dev *cdns_xspi)
+{
+ int ret = 0;
+ u32 cmd_status = readl(cdns_xspi->iobase + CDNS_XSPI_CMD_STATUS_REG);
+
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_COMPLETED) {
+ if ((cmd_status & CDNS_XSPI_CMD_STATUS_FAILED) != 0) {
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_DQS_ERROR) {
+ dev_err(cdns_xspi->dev,
+ "Incorrect DQS pulses were detected during data read operation\n");
+ ret = -EPROTO;
+ }
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_CRC_ERROR) {
+ dev_err(cdns_xspi->dev,
+ "CRC error received from minicontroller\n");
+ ret = -EPROTO;
+ }
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_BUS_ERROR) {
+ dev_err(cdns_xspi->dev,
+ "Controller got an error response on the system DMA interface\n");
+ ret = -EPROTO;
+ }
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_INV_SEQ_ERROR) {
+ dev_err(cdns_xspi->dev,
+ "Invalid command sequence has been detected\n");
+ ret = -EPROTO;
+ }
+ }
+ } else {
+ dev_err(cdns_xspi->dev, "Fatal error - command not completed\n");
+ ret = -EPROTO;
+ }
+
+ return ret;
+}
+
+static void cdns_xspi_set_interrupts(struct cdns_xspi_dev *cdns_xspi,
+ bool enabled)
+{
+ u32 intr_enable;
+
+ intr_enable = readl(cdns_xspi->iobase + CDNS_XSPI_INTR_ENABLE_REG);
+ if (enabled)
+ intr_enable |= CDNS_XSPI_INTR_MASK;
+ else
+ intr_enable &= ~CDNS_XSPI_INTR_MASK;
+ writel(intr_enable, cdns_xspi->iobase + CDNS_XSPI_INTR_ENABLE_REG);
+}
+
+static int cdns_xspi_controller_init(struct cdns_xspi_dev *cdns_xspi)
+{
+ u32 ctrl_ver;
+ u32 ctrl_features;
+ u16 hw_magic_num;
+
+ ctrl_ver = readl(cdns_xspi->iobase + CDNS_XSPI_CTRL_VERSION_REG);
+ hw_magic_num = FIELD_GET(CDNS_XSPI_MAGIC_NUM, ctrl_ver);
+ if (hw_magic_num != CDNS_XSPI_MAGIC_NUM_VALUE) {
+ dev_err(cdns_xspi->dev,
+ "Incorrect XSPI magic nunber: %x, expected: %x\n",
+ hw_magic_num, CDNS_XSPI_MAGIC_NUM_VALUE);
+ return -EIO;
+ }
+
+ ctrl_features = readl(cdns_xspi->iobase + CDNS_XSPI_CTRL_FEATURES_REG);
+ cdns_xspi->hw_num_banks = FIELD_GET(CDNS_XSPI_NUM_BANKS, ctrl_features);
+
+ writel(FIELD_PREP(CDNS_XSPI_CTRL_WORK_MODE,
+ CDNS_XSPI_CTRL_WORK_MODE_STIG),
+ cdns_xspi->iobase + CDNS_XSPI_CTRL_CONFIG_REG);
+
+ cdns_xspi_set_interrupts(cdns_xspi, false);
+
+ return 0;
+}
+
+static void cdns_xspi_sdma_handle(struct cdns_xspi_dev *cdns_xspi)
+{
+ u32 sdma_size, sdma_trd_info;
+ u8 sdma_dir;
+
+ sdma_size = readl(cdns_xspi->iobase + CDNS_XSPI_SDMA_SIZE_REG);
+ sdma_trd_info = readl(cdns_xspi->iobase + CDNS_XSPI_SDMA_TRD_INFO_REG);
+ sdma_dir = FIELD_GET(CDNS_XSPI_SDMA_DIR, sdma_trd_info);
+
+ switch (sdma_dir) {
+ case CDNS_XSPI_SDMA_DIR_READ:
+ ioread8_rep(cdns_xspi->sdmabase,
+ cdns_xspi->in_buffer, sdma_size);
+ break;
+
+ case CDNS_XSPI_SDMA_DIR_WRITE:
+ iowrite8_rep(cdns_xspi->sdmabase,
+ cdns_xspi->out_buffer, sdma_size);
+ break;
+ }
+}
+
+static int cdns_xspi_send_stig_command(struct cdns_xspi_dev *cdns_xspi,
+ const struct spi_mem_op *op, bool data_phase)
+{
+ u32 cmd_regs[5] = {0};
+ u32 cmd_status;
+
+ cdns_xspi_wait_for_controller_idle(cdns_xspi);
+ cdns_xspi_set_interrupts(cdns_xspi, true);
+ cdns_xspi->sdma_error = false;
+
+ cmd_regs[1] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_1(op, data_phase);
+ cmd_regs[2] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_2(op);
+ cmd_regs[3] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_3(op);
+ cmd_regs[4] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_4(op,
+ cdns_xspi->current_cs);
+
+ cdns_xspi_trigger_command(cdns_xspi, cmd_regs);
+
+ if (data_phase) {
+
+ cmd_regs[0] = CDNS_XSPI_STIG_DONE_FLAG;
+
+ cmd_regs[1] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_1(op);
+ cmd_regs[2] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_2(op);
+ cmd_regs[3] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_3(op);
+ cmd_regs[4] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_4(op,
+ cdns_xspi->current_cs);
+
+ cdns_xspi->in_buffer = op->data.buf.in;
+ cdns_xspi->out_buffer = op->data.buf.out;
+
+ cdns_xspi_trigger_command(cdns_xspi, cmd_regs);
+
+ wait_for_completion(&cdns_xspi->sdma_complete);
+ if (cdns_xspi->sdma_error) {
+ cdns_xspi_set_interrupts(cdns_xspi, false);
+ return -EIO;
+ }
+ cdns_xspi_sdma_handle(cdns_xspi);
+ }
+
+ wait_for_completion(&cdns_xspi->cmd_complete);
+
+ cmd_status = cdns_xspi_check_command_status(cdns_xspi);
+ cdns_xspi_set_interrupts(cdns_xspi, false);
+
+ if (cmd_status & CDNS_XSPI_CMD_STATUS_FAILED)
+ return -EPROTO;
+
+ return 0;
+}
+
+static int cdns_xspi_mem_op(struct cdns_xspi_dev *cdns_xspi,
+ struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ if (cdns_xspi->current_cs != mem->spi->chip_select)
+ cdns_xspi->current_cs = mem->spi->chip_select;
+
+ return cdns_xspi_send_stig_command(cdns_xspi, op,
+ (op->data.dir != SPI_MEM_NO_DATA));
+}
+
+static int cdns_xspi_mem_op_execute(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct cdns_xspi_dev *cdns_xspi =
+ spi_master_get_devdata(mem->spi->master);
+ int ret = 0;
+
+ mutex_lock(&cdns_xspi->lock);
+ ret = cdns_xspi_mem_op(cdns_xspi, mem, op);
+ mutex_unlock(&cdns_xspi->lock);
+
+ return ret;
+}
+
+static const struct spi_controller_mem_ops cadence_xspi_mem_ops = {
+ .exec_op = cdns_xspi_mem_op_execute,
+};
+
+static int cdns_xspi_setup(struct spi_device *spi_dev)
+{
+ if (spi_dev->chip_select > spi_dev->master->num_chipselect) {
+ dev_err(&spi_dev->dev,
+ "%d chip-select is out of range\n",
+ spi_dev->chip_select);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static irqreturn_t cdns_xspi_irq_handler(int this_irq, void *dev)
+{
+ struct cdns_xspi_dev *cdns_xspi = dev;
+ u32 irq_status;
+ irqreturn_t result = IRQ_NONE;
+
+ irq_status = readl(cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG);
+ if (irq_status) {
+ writel(irq_status,
+ cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG);
+
+ if (irq_status & CDNS_XSPI_SDMA_ERROR) {
+ dev_err(cdns_xspi->dev, "Slave DMA transaction error\n");
+ cdns_xspi->sdma_error = true;
+ complete(&cdns_xspi->sdma_complete);
+ }
+
+ if (irq_status & CDNS_XSPI_SDMA_TRIGGER)
+ complete(&cdns_xspi->sdma_complete);
+
+ if (irq_status & CDNS_XSPI_STIG_DONE)
+ complete(&cdns_xspi->cmd_complete);
+
+ result = IRQ_HANDLED;
+ }
+
+ return result;
+}
+
+static int cdns_xspi_of_get_plat_data(struct platform_device *pdev)
+{
+ struct device_node *node_prop = pdev->dev.of_node;
+ struct device_node *node_child;
+ struct cdns_xspi_platform_data *plat_data = pdev->dev.platform_data;
+ unsigned int property;
+ unsigned int cs;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-data-select-oe-start", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine data select oe start\n");
+ return -ENXIO;
+ }
+ plat_data->phy_data_sel_oe_start = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-data-select-oe-end", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine data select oe end\n");
+ return -ENXIO;
+ }
+ plat_data->phy_data_sel_oe_end = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-dqs-select-oe-start", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine DQS select oe start\n");
+ return -ENXIO;
+ }
+ plat_data->phy_dqs_sel_oe_start = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-dqs-select-oe-end", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine DQS select oe end\n");
+ return -ENXIO;
+ }
+ plat_data->phy_dqs_sel_oe_end = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-gate-cfg-close", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine gate config close\n");
+ return -ENXIO;
+ }
+ plat_data->phy_gate_cfg_close = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-gate-cfg", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine gate config\n");
+ return -ENXIO;
+ }
+ plat_data->phy_gate_cfg = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-rd-del-select", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine read delay select\n");
+ return -ENXIO;
+ }
+ plat_data->phy_rd_del_sel = property;
+
+ if (of_property_read_u32(node_prop,
+ "cdns,phy-clk-wr-delay", &property)) {
+ dev_err(&pdev->dev, "Couldn't determine clock write delay\n");
+ return -ENXIO;
+ }
+ plat_data->clk_wr_delay = property;
+
+ plat_data->dqs_last_data_drop = of_property_read_bool(node_prop,
+ "cdns,dqs-last-data-drop");
+ plat_data->use_lpbk_dqs = of_property_read_bool(node_prop,
+ "cdns,phy-use-lpbk-dqs");
+ plat_data->use_ext_lpbk_dqs = of_property_read_bool(node_prop,
+ "cdns,phy-use-ext-lpbk-dqs");
+
+ for_each_child_of_node(node_prop, node_child) {
+ if (!of_device_is_available(node_child))
+ continue;
+
+ if (of_property_read_u32(node_child, "reg", &cs)) {
+ dev_err(&pdev->dev, "Couldn't get memory chip select\n");
+ return -ENXIO;
+ } else if (cs >= CDNS_XSPI_MAX_BANKS) {
+ dev_err(&pdev->dev, "reg (cs) parameter value too large\n");
+ return -ENXIO;
+ }
+ }
+
+ return 0;
+}
+
+static void cdns_xspi_print_phy_config(struct cdns_xspi_dev *cdns_xspi)
+{
+ struct device *dev = cdns_xspi->dev;
+
+ dev_info(dev, "PHY configuration\n");
+ dev_info(dev, " * xspi_dll_phy_ctrl: %08x\n",
+ readl(cdns_xspi->iobase + CDNS_XSPI_DLL_PHY_CTRL));
+ dev_info(dev, " * phy_dq_timing: %08x\n",
+ readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQ_TIMING));
+ dev_info(dev, " * phy_dqs_timing: %08x\n",
+ readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQS_TIMING));
+ dev_info(dev, " * phy_gate_loopback_ctrl: %08x\n",
+ readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_GATE_LPBCK_CTRL));
+ dev_info(dev, " * phy_dll_slave_ctrl: %08x\n",
+ readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL));
+}
+
+static int cdns_xspi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct spi_master *master = NULL;
+ struct resource *res = NULL;
+ struct cdns_xspi_dev *cdns_xspi = NULL;
+ struct cdns_xspi_platform_data *plat_data = NULL;
+ int ret;
+
+ master = spi_alloc_master(dev, sizeof(*cdns_xspi));
+ if (!master) {
+ ret = -ENOMEM;
+ dev_err(dev, "Failed to allocate memory for spi_master\n");
+ goto err_no_mem;
+ }
+
+ master->mode_bits = SPI_3WIRE | SPI_TX_DUAL | SPI_TX_QUAD |
+ SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_OCTAL | SPI_RX_OCTAL |
+ SPI_MODE_0 | SPI_MODE_3;
+
+ master->mem_ops = &cadence_xspi_mem_ops;
+ master->setup = cdns_xspi_setup;
+ master->dev.of_node = pdev->dev.of_node;
+ master->bus_num = -1;
+
+ platform_set_drvdata(pdev, master);
+
+ plat_data = devm_kmalloc(dev, sizeof(*plat_data), GFP_KERNEL);
+ if (!plat_data) {
+ ret = -ENOMEM;
+ dev_err(dev, "Failed to allocate memory for platform_data\n");
+ goto err_spi_master;
+ }
+ pdev->dev.platform_data = plat_data;
+
+ cdns_xspi = spi_master_get_devdata(master);
+ cdns_xspi->pdev = pdev;
+ cdns_xspi->dev = &pdev->dev;
+ cdns_xspi->current_cs = 0;
+ cdns_xspi->plat_data = plat_data;
+
+ init_completion(&cdns_xspi->cmd_complete);
+ init_completion(&cdns_xspi->sdma_complete);
+
+ ret = cdns_xspi_of_get_plat_data(pdev);
+ if (ret) {
+ ret = -ENODEV;
+ dev_err(dev, "Failed to get platform data\n");
+ goto err_spi_master;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cdns_xspi->iobase = devm_ioremap_resource(cdns_xspi->dev, res);
+ if (IS_ERR(cdns_xspi->iobase)) {
+ ret = PTR_ERR(cdns_xspi->iobase);
+ dev_err(dev, "Failed to remap controller base address\n");
+ goto err_spi_master;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ cdns_xspi->sdmabase = devm_ioremap_resource(cdns_xspi->dev, res);
+ if (IS_ERR(cdns_xspi->sdmabase)) {
+ ret = PTR_ERR(cdns_xspi->sdmabase);
+ dev_err(dev, "Failed to remap SDMA address\n");
+ goto err_spi_master;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ cdns_xspi->auxbase = devm_ioremap_resource(cdns_xspi->dev, res);
+ if (IS_ERR(cdns_xspi->auxbase)) {
+ ret = PTR_ERR(cdns_xspi->auxbase);
+ dev_err(dev, "Failed to remap AUX address\n");
+ goto err_spi_master;
+ }
+
+ cdns_xspi->irq = platform_get_irq(pdev, 0);
+ if (cdns_xspi->irq < 0) {
+ ret = -ENXIO;
+ dev_err(dev, "Failed to get IRQ\n");
+ goto err_spi_master;
+ }
+
+ ret = devm_request_irq(dev, cdns_xspi->irq, cdns_xspi_irq_handler,
+ IRQF_SHARED, pdev->name, cdns_xspi);
+ if (ret) {
+ dev_err(dev, "Failed to request IRQ: %d\n", cdns_xspi->irq);
+ goto err_spi_master;
+ }
+
+ ret = cdns_xspi_phy_init(cdns_xspi);
+ if (ret) {
+ dev_err(dev, "Failed to initialize PHY\n");
+ goto err_spi_master;
+ }
+
+ cdns_xspi_print_phy_config(cdns_xspi);
+
+ ret = cdns_xspi_controller_init(cdns_xspi);
+ if (ret) {
+ dev_err(dev, "Failed to initialize controller\n");
+ goto err_spi_master;
+ }
+
+ master->num_chipselect = 1 << cdns_xspi->hw_num_banks;
+
+ ret = devm_spi_register_master(dev, master);
+ if (ret) {
+ dev_err(dev, "Failed to register SPI master\n");
+ goto err_spi_master;
+ }
+
+ dev_info(dev, "Successfully registered SPI master\n");
+
+ return 0;
+
+err_spi_master:
+ spi_master_put(master);
+
+err_no_mem:
+ dev_err(dev, "Failed to probe Cadence XSPI controller driver\n");
+
+ return ret;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id cdns_xspi_of_match[] = {
+ {
+ .compatible = "cdns,xspi-nor-fpga",
+ },
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, cdns_xspi_of_match);
+#else
+#define cdns_xspi_of_match NULL
+#endif /* CONFIG_OF */
+
+static struct platform_driver cdns_xspi_platform_driver = {
+ .probe = cdns_xspi_probe,
+ .remove = NULL,
+ .driver = {
+ .name = CDNS_XSPI_NAME,
+ .of_match_table = cdns_xspi_of_match,
+ },
+};
+
+module_platform_driver(cdns_xspi_platform_driver);
+
+MODULE_DESCRIPTION("Cadence XSPI Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" CDNS_XSPI_NAME);
+MODULE_AUTHOR("Konrad Kociolek <konrad@xxxxxxxxxxx>");
--
2.7.4