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Subject[PATCH v5 2/2] spi: cadence-quadpsi: Add support for the Cadence QSPI controller
Date
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

Add support for the Cadence QSPI controller. This controller is
present in the Intel Lightning Mountain(LGM) SoCs, Altera and TI SoCs.
This driver has been tested on the Intel LGM SoCs.

This driver does not support generic SPI and also the implementation
only supports spi-mem interface to replace the existing driver in
mtd/spi-nor/cadence-quadspi.c, the existing driver only support SPI-NOR
flash memory.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
---
drivers/spi/Kconfig | 8 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-cadence-quadspi.c | 1175 +++++++++++++++++++++++++++++++++++++
drivers/spi/spi-cadence-quadspi.h | 245 ++++++++
4 files changed, 1429 insertions(+)
create mode 100644 drivers/spi/spi-cadence-quadspi.c
create mode 100644 drivers/spi/spi-cadence-quadspi.h

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 870f7797b56b..6d48a89737a4 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -193,6 +193,14 @@ config SPI_CADENCE
This selects the Cadence SPI controller master driver
used by Xilinx Zynq and ZynqMP.

+config SPI_CADENCE_QUADSPI
+ tristate "Cadence Quad SPI controller"
+ depends on OF && (ARM || ARM64 || COMPILE_TEST || X86)
+ depends on MTD || MTD_SPI_NOR || MTD_SPI_NAND
+ help
+ Cadence QSPI is a specialized controller for connecting an SPI
+ Flash over 1/2/4/8-bit wide bus. This enables support for the Quad SPI
+
config SPI_CLPS711X
tristate "CLPS711X host SPI controller"
depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index bb49c9e6d0a0..288f5fa903fe 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_SPI_BCM_QSPI) += spi-iproc-qspi.o spi-brcmstb-qspi.o spi-bcm-qspi.
obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
obj-$(CONFIG_SPI_CADENCE) += spi-cadence.o
+obj-$(CONFIG_SPI_CADENCE_QUADSPI) += spi-cadence-quadspi.o
obj-$(CONFIG_SPI_CLPS711X) += spi-clps711x.o
obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
new file mode 100644
index 000000000000..01f4985b37f5
--- /dev/null
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -0,0 +1,1175 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Cadence QSPI Controller
+ *
+ * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ * Copyright Intel Corporation (C) 2019-2020. All rights reserved.
+ */
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/unaligned/be_byteshift.h>
+
+#include "spi-cadence-quadspi.h"
+
+/* Quirks */
+#define CQSPI_NEEDS_WR_DELAY BIT(0)
+#define CQSPI_DISABLE_DAC_MODE BIT(1)
+
+#define CADENCE_QSPI_NAME "cadence-qspi"
+
+struct cqspi_driver_platdata {
+ u32 hwcaps_mask;
+ u8 quirks;
+};
+
+static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clr)
+{
+ u32 val;
+
+ return readl_relaxed_poll_timeout(reg, val,
+ (((clr ? ~val : val) & mask) == mask),
+ 10, CQSPI_TIMEOUT_MS * 1000);
+}
+
+static bool cqspi_is_idle(struct struct_cqspi *cqspi)
+{
+ u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+
+ return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB);
+}
+
+static int cqspi_wait_idle(struct struct_cqspi *cqspi)
+{
+ const unsigned int poll_idle_retry = 3;
+ unsigned int count = 0;
+ unsigned long timeout;
+
+ timeout = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS);
+ while (1) {
+ /*
+ * Read few times in succession to ensure the controller
+ * is indeed idle, that is, the bit does not transition
+ * low again.
+ */
+ if (cqspi_is_idle(cqspi))
+ count++;
+ else
+ count = 0;
+
+ if (count >= poll_idle_retry)
+ return 0;
+
+ if (time_after(jiffies, timeout)) {
+ /* Timeout, in busy mode. */
+ dev_err(&cqspi->pdev->dev,
+ "QSPI is still busy after %dms timeout.\n",
+ CQSPI_TIMEOUT_MS);
+ return -ETIMEDOUT;
+ }
+
+ cpu_relax();
+ }
+}
+
+static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
+{
+ struct struct_cqspi *cqspi = dev;
+ u32 irq_status;
+
+ /* Read interrupt status */
+ irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS);
+ if (!irq_status)
+ return IRQ_HANDLED;
+
+ cqspi->irq_status = irq_status;
+
+ /* Clear interrupt */
+ writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS);
+ if (irq_status)
+ complete(&cqspi->transfer_complete);
+
+ return IRQ_HANDLED;
+}
+
+static u32 cqspi_cmd2addr(const unsigned char *addr_buf, u32 addr_width)
+{
+ unsigned int addr = 0;
+ int i;
+
+ /* Invalid address return zero. */
+ if (addr_width > 4)
+ return 0;
+
+ for (i = 0; i < addr_width; i++) {
+ addr = addr << 8;
+ addr |= addr_buf[i];
+ }
+
+ return addr;
+}
+
+static void cqspi_direct_access_enable(void __iomem *reg_base, bool enable)
+{
+ u32 reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ if (enable)
+ reg |= CQSPI_REG_CONFIG_DIRECT_MASK;
+ else
+ reg &= ~CQSPI_REG_CONFIG_DIRECT_MASK;
+
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_controller_enable(void __iomem *reg_base, bool enable)
+{
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ if (enable)
+ reg |= CQSPI_REG_CONFIG_ENABLE_MASK;
+ else
+ reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK;
+
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_readdata_capture(void __iomem *reg_base, u32 bypass,
+ u32 delay)
+{
+ unsigned int reg;
+
+ cqspi_controller_enable(reg_base, 0);
+
+ reg = readl(reg_base + CQSPI_REG_READCAPTURE);
+ if (bypass)
+ reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+ else
+ reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+
+ reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK
+ << CQSPI_REG_READCAPTURE_DELAY_LSB);
+ reg |= ((delay & CQSPI_REG_READCAPTURE_DELAY_MASK)
+ << CQSPI_REG_READCAPTURE_DELAY_LSB);
+ writel(reg, reg_base + CQSPI_REG_READCAPTURE);
+
+ cqspi_controller_enable(reg_base, 1);
+}
+
+static void cqspi_config_baudrate_div(void __iomem *reg_base, u32 ref_clk_hz,
+ u32 sclk)
+{
+ unsigned int reg, div;
+
+ /* Recalculate the baudrate divisor based on QSPI specification. */
+ div = DIV_ROUND_UP(ref_clk_hz, 2 * sclk) - 1;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
+ div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_chip_select(void __iomem *reg_base, u32 chip_select,
+ u32 decoder_en)
+{
+ unsigned int reg;
+
+ cqspi_controller_enable(reg_base, 0);
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ /* decoders */
+ if (decoder_en) {
+ reg |= CQSPI_REG_CONFIG_DECODE_MASK;
+ } else {
+ reg &= ~CQSPI_REG_CONFIG_DECODE_MASK;
+
+ /* Convert CS if without decoder.
+ * CS0 to 4b'1110
+ * CS1 to 4b'1101
+ * CS2 to 4b'1011
+ * CS3 to 4b'0111
+ */
+ chip_select = 0xF & ~(1 << chip_select);
+ }
+ reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK
+ << CQSPI_REG_CONFIG_CHIPSELECT_LSB);
+ reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK)
+ << CQSPI_REG_CONFIG_CHIPSELECT_LSB;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+ cqspi_controller_enable(reg_base, 1);
+}
+
+static int cqspi_exec_flash_cmd(struct struct_cqspi *cqspi, unsigned int reg)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ void __iomem *reg_base = cqspi->iobase;
+ int ret;
+
+ /* Write the CMDCTRL without start execution. */
+ writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+ /* Start execute */
+ reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK;
+ writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+
+ /* Polling for completion. */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL,
+ CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "Flash command execution timed out.\n");
+ return ret;
+ }
+ /* Polling QSPI idle status. */
+ return cqspi_wait_idle(cqspi);
+}
+
+static int cqspi_command_read(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ void __iomem *reg_base = cqspi->iobase;
+ size_t rxlen = op->data.nbytes;
+ void *rxbuf = op->data.buf.in;
+ size_t addrlen = op->addr.nbytes;
+ const u8 *addrbuf = (u8 *)op->addr.val;
+ u32 addr_value, read_len, reg;
+ int ret;
+
+ if (rxlen > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
+ dev_err(&pdev->dev, "QSPI: rxlen is invalid %zu\n", rxlen);
+ return -EINVAL;
+ }
+
+ reg = op->cmd.opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+ reg |= BIT(CQSPI_REG_CMDCTRL_RD_EN_LSB);
+
+ if (addrlen) {
+ reg |= BIT(CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((addrlen - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+ addr_value = cqspi_cmd2addr(&addrbuf[0], addrlen);
+ writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS);
+ }
+ /* 0 means 1 byte. */
+ reg |= (((rxlen - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
+ ret = cqspi_exec_flash_cmd(cqspi, reg);
+ if (ret != 0)
+ return ret;
+
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
+
+ /* Put the read value into rx_buf */
+ read_len = (rxlen > 4) ? 4 : rxlen;
+ memcpy(rxbuf, &reg, read_len);
+ rxbuf += read_len;
+
+ if (rxlen > 4) {
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
+ read_len = rxlen - read_len;
+ memcpy(rxbuf, &reg, read_len);
+ }
+
+ return 0;
+}
+
+static int cqspi_command_write(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ void __iomem *reg_base = cqspi->iobase;
+ size_t txlen = sizeof(op->cmd.opcode);
+ const u8 *databuf = op->data.buf.out;
+ size_t datalen = op->data.nbytes;
+ const u8 *addrbuf = (u8 *)op->addr.val;
+ size_t addrlen = op->addr.nbytes;
+ unsigned int addr_value, reg, data = 0;
+
+ if (txlen > CQSPI_STIG_DATA_LEN_MAX) {
+ dev_err(&pdev->dev, "QSPI: txlen is invalid %zu\n", txlen);
+ return -EINVAL;
+ }
+
+ reg = op->cmd.opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ if (datalen != 0) {
+ reg |= BIT(CQSPI_REG_CMDCTRL_WR_EN_LSB);
+ reg |= ((datalen - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
+ memcpy(&data, databuf, datalen);
+ writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
+ }
+
+ if (addrlen) {
+ reg |= BIT(CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((addrlen - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+ addr_value = cqspi_cmd2addr(&addrbuf[0], addrlen);
+ writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS);
+ }
+
+ return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_apb_read_setup(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op,
+ const u8 *addrbuf)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ size_t addrlen = op->addr.nbytes;
+ size_t dummy_bytes = op->dummy.nbytes;
+ unsigned int addr_value, dummy_clk, reg;
+
+ if (addrlen) {
+ addr_value = cqspi_cmd2addr(&addrbuf[0], addrlen);
+ writel(addr_value, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+ }
+
+ reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+ reg |= (op->data.buswidth & CQSPI_REG_RD_INSTR_TYPE_DATA_MASK) <<
+ CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
+
+ if (dummy_bytes) {
+ if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX)
+ dummy_bytes = CQSPI_DUMMY_BYTES_MAX;
+
+ reg |= BIT(CQSPI_REG_RD_INSTR_MODE_EN_LSB);
+
+ writel(0xFF, reg_base + CQSPI_REG_MODE_BIT);
+
+ dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE;
+ dummy_clk -= CQSPI_DUMMY_CLKS_PER_BYTE;
+
+ if (dummy_clk)
+ reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
+ << CQSPI_REG_RD_INSTR_DUMMY_LSB;
+ }
+ writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+ /* Set device size */
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (addrlen - 1);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+
+ /* disable auto-polling */
+ reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+ reg |= BIT(CQSPI_REG_WR_COMPLETION_DIS_POLLING_FLD_POS);
+ writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+
+ return 0;
+}
+
+static int cqspi_read_execute(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op, u8 *rxbuf)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ void *reg_base = cqspi->iobase;
+ void *ahb_base = cqspi->qspi_ahb_virt;
+ u32 rxlen = op->data.nbytes;
+ u8 *rxbuf_end = rxbuf + rxlen;
+ u32 mod_bytes = rxlen % 4;
+ u32 bytes_to_read = 0;
+ int remaining = op->data.nbytes;
+ unsigned long timeout;
+ int ret;
+
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
+
+ mb();/* flush previous writes */
+
+ writel(pdata->fifo_depth - CQSPI_REG_SRAM_RESV_WORDS,
+ reg_base + CQSPI_REG_SRAMPARTITION);
+ /* Clear all interrupts. */
+ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+ writel(CQSPI_IRQ_MASK_RD, reg_base + CQSPI_REG_IRQMASK);
+
+ reinit_completion(&cqspi->transfer_complete);
+ writel(CQSPI_REG_INDIRECTRD_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+
+ timeout = msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS);
+ while (remaining > 0) {
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ timeout))
+ ret = -ETIMEDOUT;
+
+ bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base);
+
+ while (bytes_to_read != 0) {
+ unsigned int word_remain = round_down(remaining, 4);
+
+ bytes_to_read *= CQSPI_FIFO_WIDTH;
+ bytes_to_read = bytes_to_read > remaining ?
+ remaining : bytes_to_read;
+ bytes_to_read = round_down(bytes_to_read, 4);
+ if (bytes_to_read) {
+ ioread32_rep(ahb_base, rxbuf,
+ (bytes_to_read / 4));
+ } else if (!word_remain && mod_bytes) {
+ unsigned int temp = ioread32(ahb_base);
+
+ bytes_to_read = mod_bytes;
+ memcpy(rxbuf, &temp, min((unsigned int)
+ (rxbuf_end - rxbuf), bytes_to_read));
+ }
+
+ rxbuf += bytes_to_read;
+ remaining -= bytes_to_read;
+ bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base);
+ }
+
+ if (remaining < 0)
+ reinit_completion(&cqspi->transfer_complete);
+ }
+
+ /* Check indirect done status */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD,
+ CQSPI_REG_INDIRECTRD_DONE_MASK, 0);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Indirect read completion error (%i)\n", ret);
+ goto failrd;
+ }
+
+ /* Disable interrupt */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+ /* Clear indirect completion status */
+ writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD);
+
+ return 0;
+failrd:
+ /* Disable interrupt */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+ /* Cancel the indirect read */
+ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+ return ret;
+}
+
+static int cqspi_apb_write_setup(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op, const u8 *addrbuf)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ void __iomem *reg_base = cqspi->iobase;
+ size_t addrlen = op->addr.nbytes;
+ const u8 *txbuf = &op->cmd.opcode;
+ unsigned int reg;
+
+ if (!txbuf) {
+ dev_err(&pdev->dev, "QSPI: Invalid input txbuf\n");
+ return -EINVAL;
+ }
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~(CQSPI_REG_CONFIG_DIRECT_MASK);
+ reg &= ~(CQSPI_REG_CONFIG_DMA_MASK);
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+
+ /* Set opcode. */
+ reg = txbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ reg |= BIT(CQSPI_REG_WR_CONFIG_WEL_DIS_FLD_POS);
+ /* Configure the mode for address */
+ reg |= (op->addr.buswidth & CQSPI_REG_WR_INSTR_TYPE_ADDR_MASK) <<
+ CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB;
+
+ /* Configure the mode for data */
+ reg |= (op->data.buswidth & CQSPI_REG_WR_INSTR_TYPE_DATA_MASK) <<
+ CQSPI_REG_WR_INSTR_TYPE_DATA_LSB;
+ writel(reg, reg_base + CQSPI_REG_WR_INSTR);
+ /* Setup write address. */
+ reg = cqspi_cmd2addr(&addrbuf[0], addrlen);
+ writel(reg, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= ((addrlen - 1) & CQSPI_REG_SIZE_ADDRESS_MASK);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+
+ /* disable auto-polling */
+ reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+ reg |= BIT(CQSPI_REG_WR_COMPLETION_DIS_POLLING_FLD_POS);
+ writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+
+ return 0;
+}
+
+static int cqspi_write_execute(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op, const u8 *txbuf)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ struct cqspi_flash_pdata *f_pdata =
+ &pdata->f_pdata[cqspi->current_cs];
+ void *reg_base = cqspi->iobase;
+ void *ahb_base = cqspi->qspi_ahb_virt;
+ u32 page_size = f_pdata->page_size;
+ u32 write_bytes, reg = 0;
+ int remaining = op->data.nbytes;
+ unsigned long timeout;
+ int ret;
+
+ writel(0xa, reg_base + CQSPI_INDIRECT_TRIGGER_ADDR_RANGE_REG);
+ writel(0x0, reg_base + CQSPI_REG_INDIRECTWRWATERMARK);
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
+ reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
+ reg |= (f_pdata->page_size << CQSPI_REG_SIZE_PAGE_LSB);
+ reg |= (f_pdata->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
+ writel(CQSPI_REG_SRAM_PARTITION_WR, reg_base + CQSPI_REG_SRAMPARTITION);
+ /* Clear all interrupts. */
+ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+ writel(CQSPI_IRQ_MASK_WR, reg_base + CQSPI_REG_IRQMASK);
+ reinit_completion(&cqspi->transfer_complete);
+ writel(CQSPI_REG_INDIRECTWR_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+
+ if (cqspi->wr_delay)
+ ndelay(cqspi->wr_delay);
+
+ timeout = msecs_to_jiffies(CQSPI_TIMEOUT_MS);
+ while (remaining > 0) {
+ size_t write_words, mod_bytes;
+
+ write_bytes = remaining > page_size ? page_size : remaining;
+ write_words = write_bytes / 4;
+ mod_bytes = write_bytes % 4;
+
+ if (write_words) {
+ iowrite32_rep(ahb_base, txbuf, write_words);
+ txbuf += (write_words * 4);
+ }
+ if (mod_bytes) {
+ unsigned int temp = 0xFFFFFFFF;
+
+ memcpy(&temp, txbuf, mod_bytes);
+ iowrite32(temp, ahb_base);
+ txbuf += mod_bytes;
+ }
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ timeout)) {
+ dev_err(&pdev->dev, "Indirect write timeout\n");
+ ret = -ETIMEDOUT;
+ goto failwr;
+ }
+ remaining -= write_bytes;
+ if (remaining < 0)
+ reinit_completion(&cqspi->transfer_complete);
+ }
+
+ /* Check indirect done status */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR,
+ CQSPI_REG_INDIRECTWR_DONE_MASK, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "Indirect write completion error.\n");
+ goto failwr;
+ }
+
+ return 0;
+
+failwr:
+ /* Disable interrupt. */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+ /* Clear indirect completion status */
+ writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR);
+
+ /* Cancel the indirect write */
+ if (ret)
+ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+
+ return ret;
+}
+
+static void cqspi_controller_init(struct struct_cqspi *cqspi)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+
+ cqspi_controller_enable(cqspi->iobase, 0);
+
+ /* Configure the remap address register, no remap */
+ writel(0, cqspi->iobase + CQSPI_REG_REMAP);
+
+ /* Disable all interrupts. */
+ writel(0, cqspi->iobase + CQSPI_REG_IRQMASK);
+
+ /* Load indirect trigger address. */
+ writel(pdata->trigger_address,
+ cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER);
+
+ /* Enable Direct Access Controller */
+ if (cqspi->use_dac_mode)
+ cqspi_direct_access_enable(cqspi, 1);
+
+ cqspi_controller_enable(cqspi->iobase, 1);
+}
+
+static u32 cqspi_calculate_ticks_for_ns(u32 ref_clk_hz, u32 ns_val)
+{
+ unsigned int ticks;
+
+ ticks = ref_clk_hz / 1000; /* kHz */
+ ticks = DIV_ROUND_UP(ticks * ns_val, 1000000);
+
+ return ticks;
+}
+
+static void cqspi_delay(struct struct_cqspi *cqspi, u32 ref_clk, u32 sclk_hz)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ struct cqspi_flash_pdata *f_pdata = &pdata->f_pdata[cqspi->current_cs];
+ void __iomem *iobase = cqspi->iobase;
+ const unsigned int ref_clk_hz = pdata->master_ref_clk_hz;
+ unsigned int tchsh, tshsl, tslch, tsd2d;
+ unsigned int reg;
+ unsigned int tsclk;
+
+ cqspi_controller_enable(cqspi->iobase, 0);
+ /* calculate the number of ref ticks for one sclk tick */
+ tsclk = DIV_ROUND_UP(ref_clk_hz, sclk_hz);
+
+ /* The controller adds additional delay to that programmed in the reg */
+ if (f_pdata->tshsl_ns < tsclk)
+ tshsl = tsclk;
+
+ tchsh = cqspi_calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
+ tslch = cqspi_calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
+ tsd2d = cqspi_calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns);
+ tshsl = cqspi_calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
+
+ reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK)
+ << CQSPI_REG_DELAY_TSHSL_LSB);
+ reg |= ((tchsh & CQSPI_REG_DELAY_TCHSH_MASK)
+ << CQSPI_REG_DELAY_TCHSH_LSB);
+ reg |= ((tslch & CQSPI_REG_DELAY_TSLCH_MASK)
+ << CQSPI_REG_DELAY_TSLCH_LSB);
+ reg |= ((tsd2d & CQSPI_REG_DELAY_TSD2D_MASK)
+ << CQSPI_REG_DELAY_TSD2D_LSB);
+ writel(reg, iobase + CQSPI_REG_DELAY);
+ cqspi_controller_enable(cqspi->iobase, 1);
+}
+
+static void cqspi_switch_chipselect(struct struct_cqspi *cqspi, u32 cs)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ struct cqspi_flash_pdata *f_pdata = &pdata->f_pdata[cs];
+ void __iomem *iobase = cqspi->iobase;
+ unsigned int reg;
+
+ cqspi_controller_enable(cqspi->iobase, 0);
+ /* Configure page size and block size. */
+ reg = readl(iobase + CQSPI_REG_SIZE);
+ /* clear the previous value */
+ reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
+ reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
+ reg |= (f_pdata->page_size << CQSPI_REG_SIZE_PAGE_LSB);
+ reg |= (f_pdata->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
+ writel(reg, iobase + CQSPI_REG_SIZE);
+ /* configure the chip select */
+ cqspi_chip_select(iobase, cs, pdata->ext_decoder);
+ cqspi_controller_enable(cqspi->iobase, 1);
+}
+
+static int cqspi_apb_read_execute(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op, u8 *rxbuf)
+{
+ u32 from = op->addr.val;
+ void *buf = op->data.buf.in;
+ size_t len = op->data.nbytes;
+
+ if (cqspi->use_dac_mode && (from + len < cqspi->ahb_size)) {
+ memcpy_fromio(buf, cqspi->ahbbase + from, len);
+ if (!cqspi_wait_idle(cqspi))
+ return -EIO;
+ return 0;
+ }
+
+ return cqspi_read_execute(cqspi, op, rxbuf);
+}
+
+static int cqspi_apb_write_execute(struct struct_cqspi *cqspi,
+ const struct spi_mem_op *op, const u8 *txbuf)
+{
+ u32 to = op->addr.val;
+ const void *buf = op->data.buf.out;
+ size_t len = op->data.nbytes;
+
+ if (cqspi->use_dac_mode && (to + len < cqspi->ahb_size)) {
+ memcpy_toio(cqspi->ahbbase + to, buf, len);
+ if (!cqspi_wait_idle(cqspi))
+ return -EIO;
+ return 0;
+ }
+
+ return cqspi_write_execute(cqspi, op, txbuf);
+}
+
+static int cqspi_mem_process(struct struct_cqspi *cqspi, struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ unsigned int tmpbufsize, n_trans = 0, totalxferlen = 0;
+ void __iomem *iobase = cqspi->iobase;
+ struct spi_mem_op_cadence ops[4] = { };
+ struct spi_mem_op_cadence *addr_ops = NULL;
+ struct cqspi_flash_pdata *f_pdata;
+ int mode, err;
+ u8 *tmpbuf;
+ u32 sclk;
+
+ if (cqspi->current_cs != mem->spi->chip_select) {
+ cqspi->current_cs = mem->spi->chip_select;
+ cqspi_switch_chipselect(cqspi, mem->spi->chip_select);
+ }
+
+ f_pdata = &pdata->f_pdata[cqspi->current_cs];
+
+ tmpbufsize = sizeof(op->cmd.opcode) + op->addr.nbytes +
+ op->dummy.nbytes;
+
+ tmpbuf = kzalloc(tmpbufsize, GFP_KERNEL | GFP_DMA);
+ if (!tmpbuf)
+ return -ENOMEM;
+
+ tmpbuf[0] = op->cmd.opcode;
+ ops[n_trans].tx_buf = tmpbuf;
+ ops[n_trans].len = sizeof(op->cmd.opcode);
+ ops[n_trans].tx_nbits = op->cmd.buswidth;
+
+ n_trans++;
+ totalxferlen++;
+
+ if (op->addr.nbytes) {
+ int i;
+
+ for (i = 0; i < op->addr.nbytes; i++)
+ tmpbuf[i + 1] = op->addr.val >>
+ (8 * (op->addr.nbytes - i - 1));
+
+ ops[n_trans].tx_buf = tmpbuf + 1;
+ ops[n_trans].len = op->addr.nbytes;
+ ops[n_trans].tx_nbits = op->addr.buswidth;
+
+ n_trans++;
+ totalxferlen += op->addr.nbytes;
+ }
+
+ if (op->dummy.nbytes)
+ n_trans++;
+
+ if (op->data.nbytes)
+ n_trans++;
+
+ if (n_trans == 3 || n_trans == 4)
+ addr_ops = &ops[1];
+
+ if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
+ if (!op->addr.nbytes)
+ mode = CQSPI_STIG_READ;
+ else
+ mode = CQSPI_READ;
+ } else {
+ if (!op->addr.nbytes || !op->data.buf.out)
+ mode = CQSPI_STIG_WRITE;
+ else
+ mode = CQSPI_WRITE;
+ }
+
+ sclk = mem->spi->max_speed_hz;
+ cqspi_controller_enable(iobase, 0);
+ cqspi_config_baudrate_div(iobase, pdata->master_ref_clk_hz, sclk);
+ cqspi_delay(cqspi, pdata->master_ref_clk_hz, sclk);
+ cqspi_readdata_capture(iobase, 1, f_pdata->read_delay);
+ cqspi_controller_enable(iobase, 1);
+
+ /* execute transfer */
+ switch (mode) {
+ case CQSPI_STIG_WRITE:
+ err = cqspi_command_write(cqspi, op);
+ if (err) {
+ dev_err(&pdev->dev, "QSPI: Command Write failed!.\n");
+ return err;
+ }
+ break;
+ case CQSPI_STIG_READ:
+ err = cqspi_command_read(cqspi, op);
+ if (err) {
+ dev_err(&pdev->dev, "QSPI: Command Read failed!.\n");
+ return err;
+ }
+ break;
+ case CQSPI_WRITE:
+ err = cqspi_apb_write_setup(cqspi, op, addr_ops->tx_buf);
+ err = cqspi_apb_write_execute(cqspi, op, op->data.buf.out);
+ if (err) {
+ dev_err(&pdev->dev, "QSPI: Write Execution failed!.\n");
+ return err;
+ }
+ break;
+ case CQSPI_READ:
+ err = cqspi_apb_read_setup(cqspi, op, addr_ops->tx_buf);
+ err = cqspi_apb_read_execute(cqspi, op, op->data.buf.in);
+ if (err) {
+ dev_err(&pdev->dev, "QSPI: Read Execution failed!.\n");
+ return err;
+ }
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported mode %u\n", mode);
+ return -EINVAL;
+ }
+
+ return err;
+}
+
+int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ struct struct_cqspi *cqspi = spi_master_get_devdata(mem->spi->master);
+ int ret;
+
+ mutex_lock(&cqspi->lock);
+ ret = cqspi_mem_process(cqspi, mem, op);
+ if (ret)
+ dev_err(&mem->spi->dev, "QSPI: qspi transfer failed!!!.\n");
+ mutex_unlock(&cqspi->lock);
+
+ return ret;
+}
+
+static const struct spi_controller_mem_ops cqspi_mem_ops = {
+ .exec_op = cqspi_exec_mem_op,
+};
+
+static int cqspi_setup(struct spi_device *spi)
+{
+ if (spi->chip_select > spi->master->num_chipselect) {
+ dev_err(&spi->dev, "QSPI: chip_select is out of range\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int cqspi_of_get_flash_pdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *nc;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ struct cqspi_flash_pdata *f_pdata;
+ u32 prop, cs;
+
+ /* Get flash devices platform data */
+ for_each_child_of_node(np, nc) {
+ if (!of_device_is_available(nc))
+ continue;
+
+ if (of_property_read_u32(nc, "reg", &cs)) {
+ dev_err(&pdev->dev, "couldn't determine reg\n");
+ return -ENXIO;
+ }
+ f_pdata = &pdata->f_pdata[cs];
+
+ if (of_property_read_u32(nc, "cdns,read-delay", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine read-delay\n");
+ return -ENXIO;
+ }
+ f_pdata->read_delay = prop;
+
+ if (of_property_read_u32(nc, "cdns,tshsl-ns", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine tshsl-ns\n");
+ return -ENXIO;
+ }
+ f_pdata->tshsl_ns = prop;
+
+ if (of_property_read_u32(nc, "cdns,tsd2d-ns", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n");
+ return -ENXIO;
+ }
+ f_pdata->tsd2d_ns = prop;
+
+ if (of_property_read_u32(nc, "cdns,tchsh-ns", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine tchsh-ns\n");
+ return -ENXIO;
+ }
+ f_pdata->tchsh_ns = prop;
+
+ if (of_property_read_u32(nc, "cdns,tslch-ns", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
+ return -ENXIO;
+ }
+ f_pdata->tslch_ns = prop;
+
+ if (of_property_read_u32(nc, "page-size", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine page-size\n");
+ return -ENXIO;
+ }
+ f_pdata->page_size = prop;
+
+ if (of_property_read_u32(nc, "block-size", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine block-size\n");
+ return -ENXIO;
+ }
+ f_pdata->block_size = prop;
+ }
+ return 0;
+}
+
+static int cqspi_of_get_pdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct cqspi_platform_data *pdata = pdev->dev.platform_data;
+ unsigned int prop;
+ int ret;
+
+ pdata->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
+
+ if (of_property_read_u32(np, "cdns,fifo-depth", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine fifo-depth\n");
+ return -ENXIO;
+ }
+ pdata->fifo_depth = prop;
+
+ if (of_property_read_u32(np, "cdns,fifo-width", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine fifo-width\n");
+ return -ENXIO;
+ }
+ pdata->fifo_width = prop;
+
+ if (of_property_read_u32(np, "cdns,trigger-address", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine trigger-address\n");
+ return -ENXIO;
+ }
+ pdata->trigger_address = prop;
+
+ pdata->rclk_en = of_property_read_bool(np, "cdns,rclk-en");
+
+ ret = cqspi_of_get_flash_pdata(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "Get flash data failed.\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int cqspi_probe(struct platform_device *pdev)
+{
+ struct cqspi_platform_data *pdata;
+ struct device *dev = &pdev->dev;
+ struct struct_cqspi *cqspi;
+ struct spi_master *master;
+ struct reset_control *rstc, *rstc_ocp;
+ const struct cqspi_driver_platdata *ddata;
+ struct resource *res = NULL;
+ int ret;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*cqspi));
+ if (!master) {
+ dev_err(&pdev->dev, "spi_alloc_master failed\n");
+ return -ENOMEM;
+ }
+ master->mode_bits = SPI_RX_QUAD | SPI_TX_DUAL | SPI_RX_DUAL |
+ SPI_RX_OCTAL;
+ master->setup = cqspi_setup;
+ master->mem_ops = &cqspi_mem_ops;
+ master->dev.of_node = pdev->dev.of_node;
+ cqspi = spi_master_get_devdata(master);
+ cqspi->pdev = pdev;
+
+ pdata = devm_kmalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ ret = -ENOMEM;
+
+ pdev->dev.platform_data = pdata;
+
+ /* Obtain QSPI clock. */
+ cqspi->clk = devm_clk_get(&pdev->dev, "qspi");
+ if (IS_ERR(cqspi->clk)) {
+ dev_err(&pdev->dev, "cannot get qspi clk\n");
+ return PTR_ERR(cqspi->clk);
+ }
+ pdata->master_ref_clk_hz = clk_get_rate(cqspi->clk);
+
+ ret = clk_prepare_enable(cqspi->clk);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to enable qspi clock: %d\n", ret);
+ return ret;
+ }
+
+ /* Obtain configuration from OF. */
+ ret = cqspi_of_get_pdata(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "Get platform data failed.\n");
+ return -ENODEV;
+ }
+
+ cqspi->res = res;
+ /* Obtain and remap controller address. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cqspi->iobase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(cqspi->iobase)) {
+ dev_err(dev, "Cannot remap controller address.\n");
+ return PTR_ERR(cqspi->iobase);
+ }
+
+ /* Obtain and remap AHB address. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ cqspi->qspi_ahb_virt = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cqspi->qspi_ahb_virt)) {
+ dev_err(dev, "Cannot remap AHB address.\n");
+ return PTR_ERR(cqspi->qspi_ahb_virt);
+ }
+ cqspi->ahbbase = res;
+ cqspi->ahb_size = resource_size(res);
+
+ /* Obtain QSPI reset control */
+ rstc = devm_reset_control_get_optional_exclusive(dev, "qspi");
+ if (IS_ERR(rstc)) {
+ dev_err(dev, "Cannot get QSPI reset.\n");
+ return PTR_ERR(rstc);
+ }
+
+ rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp");
+ if (IS_ERR(rstc_ocp)) {
+ dev_err(dev, "Cannot get QSPI OCP reset.\n");
+ return PTR_ERR(rstc_ocp);
+ }
+
+ reset_control_assert(rstc);
+ reset_control_deassert(rstc);
+
+ reset_control_assert(rstc_ocp);
+ reset_control_deassert(rstc_ocp);
+
+ ddata = of_device_get_match_data(dev);
+ if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY))
+ cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
+ pdata->master_ref_clk_hz);
+
+ if (ddata && (ddata->quirks & CQSPI_DISABLE_DAC_MODE))
+ cqspi->use_dac_mode = false;
+
+ init_completion(&cqspi->transfer_complete);
+
+ /* Obtain IRQ line. */
+ cqspi->irq = platform_get_irq(pdev, 0);
+ if (cqspi->irq < 0) {
+ dev_err(dev, "platform_get_irq failed.\n");
+ ret = -ENXIO;
+ }
+ ret = devm_request_irq(dev, cqspi->irq, cqspi_irq_handler, 0,
+ pdev->name, cqspi);
+ if (ret) {
+ dev_err(dev, "request_irq failed.\n");
+ goto out_clk_disable;
+ }
+
+ master->bus_num = pdata->bus_num;
+ master->num_chipselect = pdata->num_chipselect;
+ mutex_init(&cqspi->lock);
+ platform_set_drvdata(pdev, master);
+ cqspi_controller_init(cqspi);
+ cqspi->current_cs = -1;
+
+ ret = devm_spi_register_master(dev, master);
+ if (ret) {
+ dev_err(&pdev->dev, "devm_spi_register_master failed.\n");
+ goto err_of;
+ }
+
+ return 0;
+
+out_clk_disable:
+ clk_disable_unprepare(cqspi->clk);
+err_of:
+ spi_master_put(master);
+ dev_err(&pdev->dev, "Cadence QSPI controller probe failed\n");
+ return ret;
+}
+
+static int cqspi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct struct_cqspi *cadence_qspi = spi_master_get_devdata(master);
+
+ cqspi_controller_enable(cadence_qspi->iobase, 0);
+ return 0;
+}
+
+static const struct cqspi_driver_platdata k2g_qspi = {
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct cqspi_driver_platdata am654_ospi = {
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct cqspi_driver_platdata intel_lgm_qspi = {
+ .quirks = CQSPI_DISABLE_DAC_MODE,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id cqspi_of_match[] = {
+ {
+ .compatible = "cdns,qspi-nor",
+ },
+ {
+ .compatible = "ti,k2g-qspi",
+ .data = &k2g_qspi,
+ },
+ {
+ .compatible = "ti,am654-ospi",
+ .data = &am654_ospi,
+ },
+ {
+ .compatible = "intel,lgm-qspi",
+ .data = &intel_lgm_qspi,
+ },
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, cqspi_of_match);
+#else
+#define cqspi_of_match NULL
+#endif /* CONFIG_OF */
+
+static struct platform_driver cqspi_platform_driver = {
+ .probe = cqspi_probe,
+ .remove = cqspi_remove,
+ .driver = {
+ .name = CADENCE_QSPI_NAME,
+ .of_match_table = cqspi_of_match,
+ },
+};
+
+module_platform_driver(cqspi_platform_driver);
+
+MODULE_DESCRIPTION("Cadence QSPI Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" CADENCE_QSPI_NAME);
+MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
+MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>");
+MODULE_AUTHOR("Vadivel Murugan R <vadivel.muruganx.ramuthevar@intel.com>");
diff --git a/drivers/spi/spi-cadence-quadspi.h b/drivers/spi/spi-cadence-quadspi.h
new file mode 100644
index 000000000000..ce4d872d1c52
--- /dev/null
+++ b/drivers/spi/spi-cadence-quadspi.h
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Cadence QSPI Controller
+ *
+ * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ * Copyright Intel Corporation (C) 2019-2020. All rights reserved.
+ */
+#ifndef __CADENCE_QSPI__H__
+#define __CADENCE_QSPI__H__
+#include <linux/reset.h>
+#include <linux/spi/spi-mem.h>
+
+#define CQSPI_MAX_CHIP_SELECT (16)
+#define CQSPI_STIG_READ 1
+#define CQSPI_STIG_WRITE 2
+#define CQSPI_READ 3
+#define CQSPI_WRITE 4
+
+/* Operation timeout value */
+#define CQSPI_TIMEOUT_MS 5000
+#define CQSPI_READ_TIMEOUT_MS 10
+#define CQSPI_POLL_IDLE_RETRY 3
+#define CQSPI_FIFO_WIDTH 4
+
+/* Controller sram size in word */
+#define CQSPI_REG_SRAM_RESV_WORDS 2
+#define CQSPI_REG_SRAM_PARTITION_WR 1
+#define CQSPI_REG_SRAM_THRESHOLD_BYTES 50
+
+/* Instruction type */
+#define CQSPI_INST_TYPE_SINGLE 0
+#define CQSPI_INST_TYPE_DUAL 1
+#define CQSPI_INST_TYPE_QUAD 2
+#define CQSPI_DUMMY_CLKS_PER_BYTE 8
+#define CQSPI_DUMMY_BYTES_MAX 4
+#define CQSPI_STIG_DATA_LEN_MAX 8
+#define CQSPI_INDIRECTTRIGGER_ADDR_MASK 0xFFFFF
+
+/* Register map */
+#define CQSPI_REG_CONFIG 0x00
+#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
+#define CQSPI_REG_CONFIG_DIRECT_MASK BIT(7)
+#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9)
+#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
+#define CQSPI_REG_CONFIG_DMA_MASK BIT(15)
+#define CQSPI_REG_CONFIG_BAUD_LSB 19
+#define CQSPI_REG_CONFIG_IDLE_LSB 31
+#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF
+#define CQSPI_REG_CONFIG_BAUD_MASK 0xF
+#define CQSPI_REG_RD_INSTR 0x04
+#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16
+#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20
+#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3
+#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F
+#define CQSPI_REG_WR_INSTR 0x08
+#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_MASK 0x3
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16
+#define CQSPI_REG_WR_INSTR_TYPE_ADDR_MASK 0x3
+#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12
+
+/*! Field WEL_DIS_FLD - wel_dis_fld */
+#define CQSPI_REG_WR_CONFIG_WEL_DIS_FLD_POS 8
+#define CQSPI_REG_WR_COMPLETION_CTRL 0x38
+#define CQSPI_REG_WR_COMPLETION_DIS_POLLING_FLD_POS 14
+
+#define CQSPI_REG_DELAY 0x0C
+#define CQSPI_REG_DELAY_TSLCH_LSB 0
+#define CQSPI_REG_DELAY_TCHSH_LSB 8
+#define CQSPI_REG_DELAY_TSD2D_LSB 16
+#define CQSPI_REG_DELAY_TSHSL_LSB 24
+#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF
+#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF
+#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF
+#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF
+#define CQSPI_REG_READCAPTURE 0x10
+#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0
+#define CQSPI_REG_READCAPTURE_DELAY_LSB 1
+#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF
+#define CQSPI_REG_SIZE 0x14
+#define CQSPI_REG_SIZE_ADDRESS_LSB 0
+#define CQSPI_REG_SIZE_PAGE_LSB 4
+#define CQSPI_REG_SIZE_BLOCK_LSB 16
+#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF
+#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF
+#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F
+#define CQSPI_REG_SRAMPARTITION 0x18
+#define CQSPI_REG_INDIRECTTRIGGER 0x1C
+#define CQSPI_REG_DMA 0x20
+#define CQSPI_REG_DMA_SINGLE_LSB 0
+#define CQSPI_REG_DMA_BURST_LSB 8
+#define CQSPI_REG_DMA_SINGLE_MASK 0xFF
+#define CQSPI_REG_DMA_BURST_MASK 0xFF
+#define CQSPI_REG_REMAP 0x24
+#define CQSPI_REG_MODE_BIT 0x28
+#define CQSPI_REG_SDRAMLEVEL 0x2C
+#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0
+#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16
+#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF
+#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF
+
+#define CQSPI_REG_IRQSTATUS 0x40
+#define CQSPI_REG_IRQMASK 0x44
+#define CQSPI_REG_INDIRECTRD 0x60
+#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0)
+#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1)
+#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5)
+#define CQSPI_REG_INDIRECTRDWATERMARK 0x64
+#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68
+#define CQSPI_REG_INDIRECTRDBYTES 0x6C
+#define CQSPI_INDIRECT_TRIGGER_ADDR_RANGE_REG 0x80
+#define CQSPI_REG_CMDCTRL 0x90
+#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0)
+#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1)
+#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12
+#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16
+#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19
+#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20
+#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23
+#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24
+#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3
+#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7
+#define CQSPI_REG_INDIRECTWR 0x70
+#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0)
+#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1)
+#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5)
+#define CQSPI_REG_INDIRECTWRWATERMARK 0x74
+#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78
+#define CQSPI_REG_INDIRECTWRBYTES 0x7C
+#define CQSPI_REG_CMDADDRESS 0x94
+#define CQSPI_REG_CMDREADDATALOWER 0xA0
+#define CQSPI_REG_CMDREADDATAUPPER 0xA4
+#define CQSPI_REG_CMDWRITEDATALOWER 0xA8
+#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC
+
+/* Interrupt status bits */
+#define CQSPI_REG_IRQ_MODE_ERR BIT(0)
+#define CQSPI_REG_IRQ_UNDERFLOW BIT(1)
+#define CQSPI_REG_IRQ_IND_COMP BIT(2)
+#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3)
+#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4)
+#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5)
+#define CQSPI_REG_IRQ_WATERMARK BIT(6)
+#define CQSPI_REG_IRQ_IND_RD_OVERFLOW BIT(12)
+#define CQSPI_IRQ_STATUS_ERR (CQSPI_REG_IRQ_MODE_ERR | \
+ CQSPI_REG_IRQ_IND_RD_REJECT | \
+ CQSPI_REG_IRQ_WR_PROTECTED_ERR | \
+ CQSPI_REG_IRQ_ILLEGAL_AHB_ERR)
+#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_MODE_ERR | \
+ CQSPI_REG_IRQ_IND_RD_REJECT | \
+ CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_IND_RD_OVERFLOW | \
+ CQSPI_REG_IRQ_IND_COMP)
+#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_MODE_ERR | \
+ CQSPI_REG_IRQ_WR_PROTECTED_ERR | \
+ CQSPI_REG_IRQ_IND_COMP | \
+ CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_UNDERFLOW)
+
+#define CQSPI_IRQ_STATUS_MASK (0xFFFFFFFF)
+#define CQSPI_CAL_DELAY(tdelay_ns, tref_ns, tsclk_ns) \
+ ((((tdelay_ns) - (tsclk_ns)) / (tref_ns)))
+#define CQSPI_GET_RD_SRAM_LEVEL(reg_basse) \
+ (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
+ CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK)
+
+struct cqspi_flash_pdata {
+ u32 page_size;
+ u32 block_size;
+ u32 flash_type;
+ u32 quad;
+ u32 read_delay;
+ u32 tshsl_ns;
+ u32 tsd2d_ns;
+ u32 tchsh_ns;
+ u32 tslch_ns;
+};
+
+struct cqspi_platform_data {
+ u32 bus_num;
+ u32 num_chipselect;
+ u32 qspi_ahb_phy;
+ u32 qspi_ahb_size;
+ u32 qspi_ahb_mask;
+ u32 master_ref_clk_hz;
+ u32 ext_decoder;
+ u32 fifo_depth;
+ u32 fifo_width;
+ u32 enable_dma;
+ u32 tx_dma_peri_id;
+ u32 rx_dma_peri_id;
+ u32 trigger_address;
+ bool is_decoded_cs;
+ bool rclk_en;
+ struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIP_SELECT];
+};
+
+struct struct_cqspi {
+ struct platform_device *pdev;
+
+ struct clk *clk;
+ struct clk *fpi_clk;
+
+ struct reset_control *reset;
+ struct completion transfer_complete;
+ struct workqueue_struct *workqueue;
+ wait_queue_head_t waitqueue;
+ /* mutex lock for synchronization */
+ struct mutex lock;
+
+ void __iomem *iobase;
+ void __iomem *qspi_ahb_virt;
+ struct resource *res;
+ struct resource *ahbbase;
+ resource_size_t ahb_size;
+
+ struct dma_chan *rx_chan;
+ struct completion rx_dma_complete;
+ dma_addr_t mmap_phys_base;
+ int dma_done;
+ u32 trigger_address;
+ u32 wr_delay;
+ u32 irq_status;
+ int current_cs;
+ int irq;
+ bool use_dac_mode;
+};
+
+struct spi_mem_op_cadence {
+ const void *tx_buf;
+ void *rx_buf;
+ u32 len;
+ u32 tx_nbits:3;
+ u32 rx_nbits:3;
+};
+
+#endif /* __CADENCE_QSPI__H__ */
--
2.11.0
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  Last update: 2019-12-26 08:12    [W:0.065 / U:1.128 seconds]
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