and support for the SPI flash memory controller (SPI) for
the host firmware. The implementation only supports SPI NOR.
-config SPI_CADENCE_QUADSPI
- tristate "Cadence Quad SPI controller"
- depends on OF && (ARM || ARM64 || COMPILE_TEST)
- help
- Enable support for the Cadence Quad SPI Flash controller.
-
- Cadence QSPI is a specialized controller for connecting an SPI
- Flash over 1/2/4-bit wide bus. Enable this option if you have a
- device with a Cadence QSPI controller and want to access the
- Flash as an MTD device.
-
config SPI_HISI_SFC
tristate "Hisilicon FMC SPI NOR Flash Controller(SFC)"
depends on ARCH_HISI || COMPILE_TEST
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_SPI_ASPEED_SMC) += aspeed-smc.o
-obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o
obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o
obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o
obj-$(CONFIG_SPI_INTEL_SPI) += intel-spi.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Driver for Cadence QSPI Controller
- *
- * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
- * Copyright Intel Corporation (C) 2019-2020. All rights reserved.
- * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
- */
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/delay.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmaengine.h>
-#include <linux/err.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/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/reset.h>
-#include <linux/sched.h>
-#include <linux/spi/spi.h>
-#include <linux/spi/spi-mem.h>
-#include <linux/timer.h>
-
-#define CQSPI_NAME "cadence-qspi"
-#define CQSPI_MAX_CHIPSELECT 16
-
-/* Quirks */
-#define CQSPI_NEEDS_WR_DELAY BIT(0)
-#define CQSPI_DISABLE_DAC_MODE BIT(1)
-
-/* Capabilities */
-#define CQSPI_SUPPORTS_OCTAL BIT(0)
-
-struct cqspi_st;
-
-struct cqspi_flash_pdata {
- struct cqspi_st *cqspi;
- u32 clk_rate;
- u32 read_delay;
- u32 tshsl_ns;
- u32 tsd2d_ns;
- u32 tchsh_ns;
- u32 tslch_ns;
- u8 inst_width;
- u8 addr_width;
- u8 data_width;
- u8 cs;
-};
-
-struct cqspi_st {
- struct platform_device *pdev;
-
- struct clk *clk;
- unsigned int sclk;
-
- void __iomem *iobase;
- void __iomem *ahb_base;
- resource_size_t ahb_size;
- struct completion transfer_complete;
-
- struct dma_chan *rx_chan;
- struct completion rx_dma_complete;
- dma_addr_t mmap_phys_base;
-
- int current_cs;
- unsigned long master_ref_clk_hz;
- bool is_decoded_cs;
- u32 fifo_depth;
- u32 fifo_width;
- bool rclk_en;
- u32 trigger_address;
- u32 wr_delay;
- bool use_direct_mode;
- struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
-};
-
-struct cqspi_driver_platdata {
- u32 hwcaps_mask;
- u8 quirks;
-};
-
-/* Operation timeout value */
-#define CQSPI_TIMEOUT_MS 500
-#define CQSPI_READ_TIMEOUT_MS 10
-
-/* Instruction type */
-#define CQSPI_INST_TYPE_SINGLE 0
-#define CQSPI_INST_TYPE_DUAL 1
-#define CQSPI_INST_TYPE_QUAD 2
-#define CQSPI_INST_TYPE_OCTAL 3
-
-#define CQSPI_DUMMY_CLKS_PER_BYTE 8
-#define CQSPI_DUMMY_BYTES_MAX 4
-#define CQSPI_DUMMY_CLKS_MAX 31
-
-#define CQSPI_STIG_DATA_LEN_MAX 8
-
-/* Register map */
-#define CQSPI_REG_CONFIG 0x00
-#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
-#define CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL 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_ADDR_LSB 12
-#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16
-
-#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_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_SRAM_FULL BIT(12)
-
-#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \
- CQSPI_REG_IRQ_IND_SRAM_FULL | \
- CQSPI_REG_IRQ_IND_COMP)
-
-#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \
- CQSPI_REG_IRQ_WATERMARK | \
- CQSPI_REG_IRQ_UNDERFLOW)
-
-#define CQSPI_IRQ_STATUS_MASK 0x1FFFF
-
-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 cqspi_st *cqspi)
-{
- u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
-
- return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB);
-}
-
-static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi)
-{
- u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL);
-
- reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
- return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
-}
-
-static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
-{
- struct cqspi_st *cqspi = dev;
- unsigned int irq_status;
-
- /* Read interrupt status */
- irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS);
-
- /* Clear interrupt */
- writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS);
-
- irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR;
-
- if (irq_status)
- complete(&cqspi->transfer_complete);
-
- return IRQ_HANDLED;
-}
-
-static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata)
-{
- u32 rdreg = 0;
-
- rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
- rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB;
- rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
-
- return rdreg;
-}
-
-static int cqspi_wait_idle(struct cqspi_st *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 int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
-{
- 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(&cqspi->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 cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
- u8 *rxbuf = op->data.buf.in;
- u8 opcode = op->cmd.opcode;
- size_t n_rx = op->data.nbytes;
- unsigned int rdreg;
- unsigned int reg;
- size_t read_len;
- int status;
-
- if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
- dev_err(&cqspi->pdev->dev,
- "Invalid input argument, len %zu rxbuf 0x%p\n",
- n_rx, rxbuf);
- return -EINVAL;
- }
-
- reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
-
- rdreg = cqspi_calc_rdreg(f_pdata);
- writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
-
- reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
-
- /* 0 means 1 byte. */
- reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
- << CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
- status = cqspi_exec_flash_cmd(cqspi, reg);
- if (status)
- return status;
-
- reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
-
- /* Put the read value into rx_buf */
- read_len = (n_rx > 4) ? 4 : n_rx;
- memcpy(rxbuf, ®, read_len);
- rxbuf += read_len;
-
- if (n_rx > 4) {
- reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
-
- read_len = n_rx - read_len;
- memcpy(rxbuf, ®, read_len);
- }
-
- return 0;
-}
-
-static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
- const u8 opcode = op->cmd.opcode;
- const u8 *txbuf = op->data.buf.out;
- size_t n_tx = op->data.nbytes;
- unsigned int reg;
- unsigned int data;
- size_t write_len;
-
- if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
- dev_err(&cqspi->pdev->dev,
- "Invalid input argument, cmdlen %zu txbuf 0x%p\n",
- n_tx, txbuf);
- return -EINVAL;
- }
-
- reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
-
- if (op->addr.nbytes) {
- reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
- reg |= ((op->addr.nbytes - 1) &
- CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
- << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
-
- writel(op->addr.val, reg_base + CQSPI_REG_CMDADDRESS);
- }
-
- if (n_tx) {
- reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
- reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
- << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
- data = 0;
- write_len = (n_tx > 4) ? 4 : n_tx;
- memcpy(&data, txbuf, write_len);
- txbuf += write_len;
- writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
-
- if (n_tx > 4) {
- data = 0;
- write_len = n_tx - 4;
- memcpy(&data, txbuf, write_len);
- writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
- }
- }
-
- return cqspi_exec_flash_cmd(cqspi, reg);
-}
-
-static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
- unsigned int dummy_clk = 0;
- unsigned int reg;
-
- reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
- reg |= cqspi_calc_rdreg(f_pdata);
-
- /* Setup dummy clock cycles */
- dummy_clk = op->dummy.nbytes * 8;
- if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
- dummy_clk = CQSPI_DUMMY_CLKS_MAX;
-
- 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 address width */
- reg = readl(reg_base + CQSPI_REG_SIZE);
- reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
- reg |= (op->addr.nbytes - 1);
- writel(reg, reg_base + CQSPI_REG_SIZE);
- return 0;
-}
-
-static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,
- u8 *rxbuf, loff_t from_addr,
- const size_t n_rx)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- struct device *dev = &cqspi->pdev->dev;
- void __iomem *reg_base = cqspi->iobase;
- void __iomem *ahb_base = cqspi->ahb_base;
- unsigned int remaining = n_rx;
- unsigned int mod_bytes = n_rx % 4;
- unsigned int bytes_to_read = 0;
- u8 *rxbuf_end = rxbuf + n_rx;
- int ret = 0;
-
- writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
- writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
-
- /* 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);
-
- while (remaining > 0) {
- if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
- ret = -ETIMEDOUT;
-
- bytes_to_read = cqspi_get_rd_sram_level(cqspi);
-
- if (ret && bytes_to_read == 0) {
- dev_err(dev, "Indirect read timeout, no bytes\n");
- goto failrd;
- }
-
- 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);
- /* Read 4 byte word chunks then single bytes */
- 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(cqspi);
- }
-
- 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(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_write_setup(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- unsigned int reg;
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
-
- /* Set opcode. */
- reg = op->cmd.opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
- writel(reg, reg_base + CQSPI_REG_WR_INSTR);
- reg = cqspi_calc_rdreg(f_pdata);
- writel(reg, reg_base + CQSPI_REG_RD_INSTR);
-
- reg = readl(reg_base + CQSPI_REG_SIZE);
- reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
- reg |= (op->addr.nbytes - 1);
- writel(reg, reg_base + CQSPI_REG_SIZE);
- return 0;
-}
-
-static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata,
- loff_t to_addr, const u8 *txbuf,
- const size_t n_tx)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- struct device *dev = &cqspi->pdev->dev;
- void __iomem *reg_base = cqspi->iobase;
- unsigned int remaining = n_tx;
- unsigned int write_bytes;
- int ret;
-
- writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
- writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
-
- /* 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);
- /*
- * As per 66AK2G02 TRM SPRUHY8F section 11.15.5.3 Indirect Access
- * Controller programming sequence, couple of cycles of
- * QSPI_REF_CLK delay is required for the above bit to
- * be internally synchronized by the QSPI module. Provide 5
- * cycles of delay.
- */
- if (cqspi->wr_delay)
- ndelay(cqspi->wr_delay);
-
- while (remaining > 0) {
- size_t write_words, mod_bytes;
-
- write_bytes = remaining;
- write_words = write_bytes / 4;
- mod_bytes = write_bytes % 4;
- /* Write 4 bytes at a time then single bytes. */
- if (write_words) {
- iowrite32_rep(cqspi->ahb_base, txbuf, write_words);
- txbuf += (write_words * 4);
- }
- if (mod_bytes) {
- unsigned int temp = 0xFFFFFFFF;
-
- memcpy(&temp, txbuf, mod_bytes);
- iowrite32(temp, cqspi->ahb_base);
- txbuf += mod_bytes;
- }
-
- if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
- dev_err(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(dev, "Indirect write completion error (%i)\n", ret);
- goto 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);
-
- cqspi_wait_idle(cqspi);
-
- return 0;
-
-failwr:
- /* Disable interrupt. */
- writel(0, reg_base + CQSPI_REG_IRQMASK);
-
- /* Cancel the indirect write */
- writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
- reg_base + CQSPI_REG_INDIRECTWR);
- return ret;
-}
-
-static void cqspi_chipselect(struct cqspi_flash_pdata *f_pdata)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
- unsigned int chip_select = f_pdata->cs;
- unsigned int reg;
-
- reg = readl(reg_base + CQSPI_REG_CONFIG);
- if (cqspi->is_decoded_cs) {
- 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);
-}
-
-static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
- const unsigned int 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 cqspi_flash_pdata *f_pdata)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *iobase = cqspi->iobase;
- const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
- unsigned int tshsl, tchsh, tslch, tsd2d;
- unsigned int reg;
- unsigned int tsclk;
-
- /* calculate the number of ref ticks for one sclk tick */
- tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk);
-
- tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
- /* this particular value must be at least one sclk */
- if (tshsl < tsclk)
- tshsl = tsclk;
-
- tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
- tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
- tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_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);
-}
-
-static void cqspi_config_baudrate_div(struct cqspi_st *cqspi)
-{
- const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
- void __iomem *reg_base = cqspi->iobase;
- u32 reg, div;
-
- /* Recalculate the baudrate divisor based on QSPI specification. */
- div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1;
-
- reg = readl(reg_base + CQSPI_REG_CONFIG);
- reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
- reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
- writel(reg, reg_base + CQSPI_REG_CONFIG);
-}
-
-static void cqspi_readdata_capture(struct cqspi_st *cqspi,
- const bool bypass,
- const unsigned int delay)
-{
- void __iomem *reg_base = cqspi->iobase;
- unsigned int reg;
-
- 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);
-}
-
-static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
-{
- void __iomem *reg_base = cqspi->iobase;
- 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_configure(struct cqspi_flash_pdata *f_pdata,
- unsigned long sclk)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- int switch_cs = (cqspi->current_cs != f_pdata->cs);
- int switch_ck = (cqspi->sclk != sclk);
-
- if (switch_cs || switch_ck)
- cqspi_controller_enable(cqspi, 0);
-
- /* Switch chip select. */
- if (switch_cs) {
- cqspi->current_cs = f_pdata->cs;
- cqspi_chipselect(f_pdata);
- }
-
- /* Setup baudrate divisor and delays */
- if (switch_ck) {
- cqspi->sclk = sclk;
- cqspi_config_baudrate_div(cqspi);
- cqspi_delay(f_pdata);
- cqspi_readdata_capture(cqspi, !cqspi->rclk_en,
- f_pdata->read_delay);
- }
-
- if (switch_cs || switch_ck)
- cqspi_controller_enable(cqspi, 1);
-}
-
-static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
- f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
- f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
-
- if (op->data.dir == SPI_MEM_DATA_IN) {
- switch (op->data.buswidth) {
- case 1:
- f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
- break;
- case 2:
- f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
- break;
- case 4:
- f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
- break;
- case 8:
- f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
- break;
- default:
- return -EINVAL;
- }
- }
-
- return 0;
-}
-
-static ssize_t cqspi_write(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- loff_t to = op->addr.val;
- size_t len = op->data.nbytes;
- const u_char *buf = op->data.buf.out;
- int ret;
-
- ret = cqspi_set_protocol(f_pdata, op);
- if (ret)
- return ret;
-
- ret = cqspi_write_setup(f_pdata, op);
- if (ret)
- return ret;
-
- if (cqspi->use_direct_mode && ((to + len) <= cqspi->ahb_size)) {
- memcpy_toio(cqspi->ahb_base + to, buf, len);
- return cqspi_wait_idle(cqspi);
- }
-
- return cqspi_indirect_write_execute(f_pdata, to, buf, len);
-}
-
-static void cqspi_rx_dma_callback(void *param)
-{
- struct cqspi_st *cqspi = param;
-
- complete(&cqspi->rx_dma_complete);
-}
-
-static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata,
- u_char *buf, loff_t from, size_t len)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- struct device *dev = &cqspi->pdev->dev;
- enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
- dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from;
- int ret = 0;
- struct dma_async_tx_descriptor *tx;
- dma_cookie_t cookie;
- dma_addr_t dma_dst;
-
- if (!cqspi->rx_chan || !virt_addr_valid(buf)) {
- memcpy_fromio(buf, cqspi->ahb_base + from, len);
- return 0;
- }
-
- dma_dst = dma_map_single(dev, buf, len, DMA_FROM_DEVICE);
- if (dma_mapping_error(dev, dma_dst)) {
- dev_err(dev, "dma mapping failed\n");
- return -ENOMEM;
- }
- tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src,
- len, flags);
- if (!tx) {
- dev_err(dev, "device_prep_dma_memcpy error\n");
- ret = -EIO;
- goto err_unmap;
- }
-
- tx->callback = cqspi_rx_dma_callback;
- tx->callback_param = cqspi;
- cookie = tx->tx_submit(tx);
- reinit_completion(&cqspi->rx_dma_complete);
-
- ret = dma_submit_error(cookie);
- if (ret) {
- dev_err(dev, "dma_submit_error %d\n", cookie);
- ret = -EIO;
- goto err_unmap;
- }
-
- dma_async_issue_pending(cqspi->rx_chan);
- if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
- msecs_to_jiffies(len))) {
- dmaengine_terminate_sync(cqspi->rx_chan);
- dev_err(dev, "DMA wait_for_completion_timeout\n");
- ret = -ETIMEDOUT;
- goto err_unmap;
- }
-
-err_unmap:
- dma_unmap_single(dev, dma_dst, len, DMA_FROM_DEVICE);
-
- return ret;
-}
-
-static ssize_t cqspi_read(struct cqspi_flash_pdata *f_pdata,
- const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = f_pdata->cqspi;
- loff_t from = op->addr.val;
- size_t len = op->data.nbytes;
- u_char *buf = op->data.buf.in;
- int ret;
-
- ret = cqspi_set_protocol(f_pdata, op);
- if (ret)
- return ret;
-
- ret = cqspi_read_setup(f_pdata, op);
- if (ret)
- return ret;
-
- if (cqspi->use_direct_mode && ((from + len) <= cqspi->ahb_size))
- return cqspi_direct_read_execute(f_pdata, buf, from, len);
-
- return cqspi_indirect_read_execute(f_pdata, buf, from, len);
-}
-
-static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
-{
- struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master);
- struct cqspi_flash_pdata *f_pdata;
-
- f_pdata = &cqspi->f_pdata[mem->spi->chip_select];
- cqspi_configure(f_pdata, mem->spi->max_speed_hz);
-
- if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
- if (!op->addr.nbytes)
- return cqspi_command_read(f_pdata, op);
-
- return cqspi_read(f_pdata, op);
- }
-
- if (!op->addr.nbytes || !op->data.buf.out)
- return cqspi_command_write(f_pdata, op);
-
- return cqspi_write(f_pdata, op);
-}
-
-static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
-{
- int ret;
-
- ret = cqspi_mem_process(mem, op);
- if (ret)
- dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
-
- return ret;
-}
-
-static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
- struct cqspi_flash_pdata *f_pdata,
- struct device_node *np)
-{
- if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) {
- dev_err(&pdev->dev, "couldn't determine read-delay\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) {
- dev_err(&pdev->dev, "couldn't determine tshsl-ns\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) {
- dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) {
- dev_err(&pdev->dev, "couldn't determine tchsh-ns\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) {
- dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) {
- dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n");
- return -ENXIO;
- }
-
- return 0;
-}
-
-static int cqspi_of_get_pdata(struct cqspi_st *cqspi)
-{
- struct device *dev = &cqspi->pdev->dev;
- struct device_node *np = dev->of_node;
-
- cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
-
- if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) {
- dev_err(dev, "couldn't determine fifo-depth\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) {
- dev_err(dev, "couldn't determine fifo-width\n");
- return -ENXIO;
- }
-
- if (of_property_read_u32(np, "cdns,trigger-address",
- &cqspi->trigger_address)) {
- dev_err(dev, "couldn't determine trigger-address\n");
- return -ENXIO;
- }
-
- cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en");
-
- return 0;
-}
-
-static void cqspi_controller_init(struct cqspi_st *cqspi)
-{
- u32 reg;
-
- cqspi_controller_enable(cqspi, 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);
-
- /* Configure the SRAM split to 1:1 . */
- writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION);
-
- /* Load indirect trigger address. */
- writel(cqspi->trigger_address,
- cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER);
-
- /* Program read watermark -- 1/2 of the FIFO. */
- writel(cqspi->fifo_depth * cqspi->fifo_width / 2,
- cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK);
- /* Program write watermark -- 1/8 of the FIFO. */
- writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
- cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);
-
- /* Enable Direct Access Controller */
- reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
- reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
- writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
-
- cqspi_controller_enable(cqspi, 1);
-}
-
-static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
-{
- dma_cap_mask_t mask;
-
- dma_cap_zero(mask);
- dma_cap_set(DMA_MEMCPY, mask);
-
- cqspi->rx_chan = dma_request_chan_by_mask(&mask);
- if (IS_ERR(cqspi->rx_chan)) {
- int ret = PTR_ERR(cqspi->rx_chan);
-
- if (ret != -EPROBE_DEFER)
- dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
- cqspi->rx_chan = NULL;
- return ret;
- }
- init_completion(&cqspi->rx_dma_complete);
-
- return 0;
-}
-
-static const struct spi_controller_mem_ops cqspi_mem_ops = {
- .exec_op = cqspi_exec_mem_op,
-};
-
-static int cqspi_setup_flash(struct cqspi_st *cqspi)
-{
- struct platform_device *pdev = cqspi->pdev;
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct cqspi_flash_pdata *f_pdata;
- unsigned int cs;
- int ret;
-
- /* Get flash device data */
- for_each_available_child_of_node(dev->of_node, np) {
- ret = of_property_read_u32(np, "reg", &cs);
- if (ret) {
- dev_err(dev, "Couldn't determine chip select.\n");
- return ret;
- }
-
- if (cs >= CQSPI_MAX_CHIPSELECT) {
- dev_err(dev, "Chip select %d out of range.\n", cs);
- return -EINVAL;
- }
-
- f_pdata = &cqspi->f_pdata[cs];
- f_pdata->cqspi = cqspi;
- f_pdata->cs = cs;
-
- ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-static int cqspi_probe(struct platform_device *pdev)
-{
- const struct cqspi_driver_platdata *ddata;
- struct reset_control *rstc, *rstc_ocp;
- struct device *dev = &pdev->dev;
- struct spi_master *master;
- struct resource *res_ahb;
- struct cqspi_st *cqspi;
- struct resource *res;
- int ret;
- int irq;
-
- 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_RX_DUAL;
- master->mem_ops = &cqspi_mem_ops;
- master->dev.of_node = pdev->dev.of_node;
-
- cqspi = spi_master_get_devdata(master);
-
- cqspi->pdev = pdev;
-
- /* Obtain configuration from OF. */
- ret = cqspi_of_get_pdata(cqspi);
- if (ret) {
- dev_err(dev, "Cannot get mandatory OF data.\n");
- ret = -ENODEV;
- goto probe_master_put;
- }
-
- /* Obtain QSPI clock. */
- cqspi->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(cqspi->clk)) {
- dev_err(dev, "Cannot claim QSPI clock.\n");
- ret = PTR_ERR(cqspi->clk);
- goto probe_master_put;
- }
-
- /* Obtain and remap controller address. */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- cqspi->iobase = devm_ioremap_resource(dev, res);
- if (IS_ERR(cqspi->iobase)) {
- dev_err(dev, "Cannot remap controller address.\n");
- ret = PTR_ERR(cqspi->iobase);
- goto probe_master_put;
- }
-
- /* Obtain and remap AHB address. */
- res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb);
- if (IS_ERR(cqspi->ahb_base)) {
- dev_err(dev, "Cannot remap AHB address.\n");
- ret = PTR_ERR(cqspi->ahb_base);
- goto probe_master_put;
- }
- cqspi->mmap_phys_base = (dma_addr_t)res_ahb->start;
- cqspi->ahb_size = resource_size(res_ahb);
-
- init_completion(&cqspi->transfer_complete);
-
- /* Obtain IRQ line. */
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- ret = -ENXIO;
- goto probe_master_put;
- }
-
- pm_runtime_enable(dev);
- ret = pm_runtime_get_sync(dev);
- if (ret < 0) {
- pm_runtime_put_noidle(dev);
- goto probe_master_put;
- }
-
- ret = clk_prepare_enable(cqspi->clk);
- if (ret) {
- dev_err(dev, "Cannot enable QSPI clock.\n");
- goto probe_clk_failed;
- }
-
- /* 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");
- goto probe_reset_failed;
- }
-
- 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");
- goto probe_reset_failed;
- }
-
- reset_control_assert(rstc);
- reset_control_deassert(rstc);
-
- reset_control_assert(rstc_ocp);
- reset_control_deassert(rstc_ocp);
-
- cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
- ddata = of_device_get_match_data(dev);
- if (ddata) {
- if (ddata->quirks & CQSPI_NEEDS_WR_DELAY)
- cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
- cqspi->master_ref_clk_hz);
- if (ddata->hwcaps_mask & CQSPI_SUPPORTS_OCTAL)
- master->mode_bits |= SPI_RX_OCTAL;
- if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE))
- cqspi->use_direct_mode = true;
- }
-
- ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
- pdev->name, cqspi);
- if (ret) {
- dev_err(dev, "Cannot request IRQ.\n");
- goto probe_reset_failed;
- }
-
- cqspi_wait_idle(cqspi);
- cqspi_controller_init(cqspi);
- cqspi->current_cs = -1;
- cqspi->sclk = 0;
-
- ret = cqspi_setup_flash(cqspi);
- if (ret) {
- dev_err(dev, "failed to setup flash parameters %d\n", ret);
- goto probe_setup_failed;
- }
-
- if (cqspi->use_direct_mode) {
- ret = cqspi_request_mmap_dma(cqspi);
- if (ret == -EPROBE_DEFER)
- goto probe_setup_failed;
- }
-
- ret = devm_spi_register_master(dev, master);
- if (ret) {
- dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret);
- goto probe_setup_failed;
- }
-
- return 0;
-probe_setup_failed:
- cqspi_controller_enable(cqspi, 0);
-probe_reset_failed:
- clk_disable_unprepare(cqspi->clk);
-probe_clk_failed:
- pm_runtime_put_sync(dev);
- pm_runtime_disable(dev);
-probe_master_put:
- spi_master_put(master);
- return ret;
-}
-
-static int cqspi_remove(struct platform_device *pdev)
-{
- struct cqspi_st *cqspi = platform_get_drvdata(pdev);
-
- cqspi_controller_enable(cqspi, 0);
-
- if (cqspi->rx_chan)
- dma_release_channel(cqspi->rx_chan);
-
- clk_disable_unprepare(cqspi->clk);
-
- pm_runtime_put_sync(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int cqspi_suspend(struct device *dev)
-{
- struct cqspi_st *cqspi = dev_get_drvdata(dev);
-
- cqspi_controller_enable(cqspi, 0);
- return 0;
-}
-
-static int cqspi_resume(struct device *dev)
-{
- struct cqspi_st *cqspi = dev_get_drvdata(dev);
-
- cqspi_controller_enable(cqspi, 1);
- return 0;
-}
-
-static const struct dev_pm_ops cqspi__dev_pm_ops = {
- .suspend = cqspi_suspend,
- .resume = cqspi_resume,
-};
-
-#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops)
-#else
-#define CQSPI_DEV_PM_OPS NULL
-#endif
-
-static const struct cqspi_driver_platdata cdns_qspi = {
- .quirks = CQSPI_DISABLE_DAC_MODE,
-};
-
-static const struct cqspi_driver_platdata k2g_qspi = {
- .quirks = CQSPI_NEEDS_WR_DELAY,
-};
-
-static const struct cqspi_driver_platdata am654_ospi = {
- .hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
- .quirks = CQSPI_NEEDS_WR_DELAY,
-};
-
-static const struct of_device_id cqspi_dt_ids[] = {
- {
- .compatible = "cdns,qspi-nor",
- .data = &cdns_qspi,
- },
- {
- .compatible = "ti,k2g-qspi",
- .data = &k2g_qspi,
- },
- {
- .compatible = "ti,am654-ospi",
- .data = &am654_ospi,
- },
- { /* end of table */ }
-};
-
-MODULE_DEVICE_TABLE(of, cqspi_dt_ids);
-
-static struct platform_driver cqspi_platform_driver = {
- .probe = cqspi_probe,
- .remove = cqspi_remove,
- .driver = {
- .name = CQSPI_NAME,
- .pm = CQSPI_DEV_PM_OPS,
- .of_match_table = cqspi_dt_ids,
- },
-};
-
-module_platform_driver(cqspi_platform_driver);
-
-MODULE_DESCRIPTION("Cadence QSPI Controller Driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" CQSPI_NAME);
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)
+ help
+ Enable support for the Cadence Quad SPI Flash controller.
+
+ Cadence QSPI is a specialized controller for connecting an SPI
+ Flash over 1/2/4-bit wide bus. Enable this option if you have a
+ device with a Cadence QSPI controller and want to access the
+ Flash as an MTD device.
+
config SPI_CLPS711X
tristate "CLPS711X host SPI controller"
depends on ARCH_CLPS711X || COMPILE_TEST
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
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Driver for Cadence QSPI Controller
+//
+// Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+// Copyright Intel Corporation (C) 2019-2020. All rights reserved.
+// Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/err.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/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/timer.h>
+
+#define CQSPI_NAME "cadence-qspi"
+#define CQSPI_MAX_CHIPSELECT 16
+
+/* Quirks */
+#define CQSPI_NEEDS_WR_DELAY BIT(0)
+#define CQSPI_DISABLE_DAC_MODE BIT(1)
+
+/* Capabilities */
+#define CQSPI_SUPPORTS_OCTAL BIT(0)
+
+struct cqspi_st;
+
+struct cqspi_flash_pdata {
+ struct cqspi_st *cqspi;
+ u32 clk_rate;
+ u32 read_delay;
+ u32 tshsl_ns;
+ u32 tsd2d_ns;
+ u32 tchsh_ns;
+ u32 tslch_ns;
+ u8 inst_width;
+ u8 addr_width;
+ u8 data_width;
+ u8 cs;
+};
+
+struct cqspi_st {
+ struct platform_device *pdev;
+
+ struct clk *clk;
+ unsigned int sclk;
+
+ void __iomem *iobase;
+ void __iomem *ahb_base;
+ resource_size_t ahb_size;
+ struct completion transfer_complete;
+
+ struct dma_chan *rx_chan;
+ struct completion rx_dma_complete;
+ dma_addr_t mmap_phys_base;
+
+ int current_cs;
+ unsigned long master_ref_clk_hz;
+ bool is_decoded_cs;
+ u32 fifo_depth;
+ u32 fifo_width;
+ bool rclk_en;
+ u32 trigger_address;
+ u32 wr_delay;
+ bool use_direct_mode;
+ struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
+};
+
+struct cqspi_driver_platdata {
+ u32 hwcaps_mask;
+ u8 quirks;
+};
+
+/* Operation timeout value */
+#define CQSPI_TIMEOUT_MS 500
+#define CQSPI_READ_TIMEOUT_MS 10
+
+/* Instruction type */
+#define CQSPI_INST_TYPE_SINGLE 0
+#define CQSPI_INST_TYPE_DUAL 1
+#define CQSPI_INST_TYPE_QUAD 2
+#define CQSPI_INST_TYPE_OCTAL 3
+
+#define CQSPI_DUMMY_CLKS_PER_BYTE 8
+#define CQSPI_DUMMY_BYTES_MAX 4
+#define CQSPI_DUMMY_CLKS_MAX 31
+
+#define CQSPI_STIG_DATA_LEN_MAX 8
+
+/* Register map */
+#define CQSPI_REG_CONFIG 0x00
+#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
+#define CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL 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_ADDR_LSB 12
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16
+
+#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_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_SRAM_FULL BIT(12)
+
+#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_IND_SRAM_FULL | \
+ CQSPI_REG_IRQ_IND_COMP)
+
+#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \
+ CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_UNDERFLOW)
+
+#define CQSPI_IRQ_STATUS_MASK 0x1FFFF
+
+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 cqspi_st *cqspi)
+{
+ u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+
+ return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB);
+}
+
+static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi)
+{
+ u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL);
+
+ reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
+ return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
+}
+
+static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
+{
+ struct cqspi_st *cqspi = dev;
+ unsigned int irq_status;
+
+ /* Read interrupt status */
+ irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS);
+
+ /* Clear interrupt */
+ writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS);
+
+ irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR;
+
+ if (irq_status)
+ complete(&cqspi->transfer_complete);
+
+ return IRQ_HANDLED;
+}
+
+static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata)
+{
+ u32 rdreg = 0;
+
+ rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
+ rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB;
+ rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
+
+ return rdreg;
+}
+
+static int cqspi_wait_idle(struct cqspi_st *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 int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
+{
+ 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(&cqspi->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 cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ u8 *rxbuf = op->data.buf.in;
+ u8 opcode = op->cmd.opcode;
+ size_t n_rx = op->data.nbytes;
+ unsigned int rdreg;
+ unsigned int reg;
+ size_t read_len;
+ int status;
+
+ if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
+ dev_err(&cqspi->pdev->dev,
+ "Invalid input argument, len %zu rxbuf 0x%p\n",
+ n_rx, rxbuf);
+ return -EINVAL;
+ }
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ rdreg = cqspi_calc_rdreg(f_pdata);
+ writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
+
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
+
+ /* 0 means 1 byte. */
+ reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
+ status = cqspi_exec_flash_cmd(cqspi, reg);
+ if (status)
+ return status;
+
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
+
+ /* Put the read value into rx_buf */
+ read_len = (n_rx > 4) ? 4 : n_rx;
+ memcpy(rxbuf, ®, read_len);
+ rxbuf += read_len;
+
+ if (n_rx > 4) {
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
+
+ read_len = n_rx - read_len;
+ memcpy(rxbuf, ®, read_len);
+ }
+
+ return 0;
+}
+
+static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ const u8 opcode = op->cmd.opcode;
+ const u8 *txbuf = op->data.buf.out;
+ size_t n_tx = op->data.nbytes;
+ unsigned int reg;
+ unsigned int data;
+ size_t write_len;
+
+ if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
+ dev_err(&cqspi->pdev->dev,
+ "Invalid input argument, cmdlen %zu txbuf 0x%p\n",
+ n_tx, txbuf);
+ return -EINVAL;
+ }
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ if (op->addr.nbytes) {
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((op->addr.nbytes - 1) &
+ CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+
+ writel(op->addr.val, reg_base + CQSPI_REG_CMDADDRESS);
+ }
+
+ if (n_tx) {
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
+ reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
+ data = 0;
+ write_len = (n_tx > 4) ? 4 : n_tx;
+ memcpy(&data, txbuf, write_len);
+ txbuf += write_len;
+ writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
+
+ if (n_tx > 4) {
+ data = 0;
+ write_len = n_tx - 4;
+ memcpy(&data, txbuf, write_len);
+ writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
+ }
+ }
+
+ return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int dummy_clk = 0;
+ unsigned int reg;
+
+ reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+ reg |= cqspi_calc_rdreg(f_pdata);
+
+ /* Setup dummy clock cycles */
+ dummy_clk = op->dummy.nbytes * 8;
+ if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
+ dummy_clk = CQSPI_DUMMY_CLKS_MAX;
+
+ 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 address width */
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (op->addr.nbytes - 1);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,
+ u8 *rxbuf, loff_t from_addr,
+ const size_t n_rx)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
+ void __iomem *reg_base = cqspi->iobase;
+ void __iomem *ahb_base = cqspi->ahb_base;
+ unsigned int remaining = n_rx;
+ unsigned int mod_bytes = n_rx % 4;
+ unsigned int bytes_to_read = 0;
+ u8 *rxbuf_end = rxbuf + n_rx;
+ int ret = 0;
+
+ writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
+
+ /* 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);
+
+ while (remaining > 0) {
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
+ ret = -ETIMEDOUT;
+
+ bytes_to_read = cqspi_get_rd_sram_level(cqspi);
+
+ if (ret && bytes_to_read == 0) {
+ dev_err(dev, "Indirect read timeout, no bytes\n");
+ goto failrd;
+ }
+
+ 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);
+ /* Read 4 byte word chunks then single bytes */
+ 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(cqspi);
+ }
+
+ 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(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_write_setup(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ unsigned int reg;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+
+ /* Set opcode. */
+ reg = op->cmd.opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ writel(reg, reg_base + CQSPI_REG_WR_INSTR);
+ reg = cqspi_calc_rdreg(f_pdata);
+ writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (op->addr.nbytes - 1);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata,
+ loff_t to_addr, const u8 *txbuf,
+ const size_t n_tx)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int remaining = n_tx;
+ unsigned int write_bytes;
+ int ret;
+
+ writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
+
+ /* 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);
+ /*
+ * As per 66AK2G02 TRM SPRUHY8F section 11.15.5.3 Indirect Access
+ * Controller programming sequence, couple of cycles of
+ * QSPI_REF_CLK delay is required for the above bit to
+ * be internally synchronized by the QSPI module. Provide 5
+ * cycles of delay.
+ */
+ if (cqspi->wr_delay)
+ ndelay(cqspi->wr_delay);
+
+ while (remaining > 0) {
+ size_t write_words, mod_bytes;
+
+ write_bytes = remaining;
+ write_words = write_bytes / 4;
+ mod_bytes = write_bytes % 4;
+ /* Write 4 bytes at a time then single bytes. */
+ if (write_words) {
+ iowrite32_rep(cqspi->ahb_base, txbuf, write_words);
+ txbuf += (write_words * 4);
+ }
+ if (mod_bytes) {
+ unsigned int temp = 0xFFFFFFFF;
+
+ memcpy(&temp, txbuf, mod_bytes);
+ iowrite32(temp, cqspi->ahb_base);
+ txbuf += mod_bytes;
+ }
+
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
+ dev_err(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(dev, "Indirect write completion error (%i)\n", ret);
+ goto 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);
+
+ cqspi_wait_idle(cqspi);
+
+ return 0;
+
+failwr:
+ /* Disable interrupt. */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Cancel the indirect write */
+ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+ return ret;
+}
+
+static void cqspi_chipselect(struct cqspi_flash_pdata *f_pdata)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int chip_select = f_pdata->cs;
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ if (cqspi->is_decoded_cs) {
+ 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);
+}
+
+static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
+ const unsigned int 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 cqspi_flash_pdata *f_pdata)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *iobase = cqspi->iobase;
+ const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
+ unsigned int tshsl, tchsh, tslch, tsd2d;
+ unsigned int reg;
+ unsigned int tsclk;
+
+ /* calculate the number of ref ticks for one sclk tick */
+ tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk);
+
+ tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
+ /* this particular value must be at least one sclk */
+ if (tshsl < tsclk)
+ tshsl = tsclk;
+
+ tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
+ tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
+ tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_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);
+}
+
+static void cqspi_config_baudrate_div(struct cqspi_st *cqspi)
+{
+ const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
+ void __iomem *reg_base = cqspi->iobase;
+ u32 reg, div;
+
+ /* Recalculate the baudrate divisor based on QSPI specification. */
+ div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
+ reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_readdata_capture(struct cqspi_st *cqspi,
+ const bool bypass,
+ const unsigned int delay)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ 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);
+}
+
+static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ 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_configure(struct cqspi_flash_pdata *f_pdata,
+ unsigned long sclk)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ int switch_cs = (cqspi->current_cs != f_pdata->cs);
+ int switch_ck = (cqspi->sclk != sclk);
+
+ if (switch_cs || switch_ck)
+ cqspi_controller_enable(cqspi, 0);
+
+ /* Switch chip select. */
+ if (switch_cs) {
+ cqspi->current_cs = f_pdata->cs;
+ cqspi_chipselect(f_pdata);
+ }
+
+ /* Setup baudrate divisor and delays */
+ if (switch_ck) {
+ cqspi->sclk = sclk;
+ cqspi_config_baudrate_div(cqspi);
+ cqspi_delay(f_pdata);
+ cqspi_readdata_capture(cqspi, !cqspi->rclk_en,
+ f_pdata->read_delay);
+ }
+
+ if (switch_cs || switch_ck)
+ cqspi_controller_enable(cqspi, 1);
+}
+
+static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
+ f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
+ f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
+
+ if (op->data.dir == SPI_MEM_DATA_IN) {
+ switch (op->data.buswidth) {
+ case 1:
+ f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
+ break;
+ case 2:
+ f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
+ break;
+ case 4:
+ f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
+ break;
+ case 8:
+ f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static ssize_t cqspi_write(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ loff_t to = op->addr.val;
+ size_t len = op->data.nbytes;
+ const u_char *buf = op->data.buf.out;
+ int ret;
+
+ ret = cqspi_set_protocol(f_pdata, op);
+ if (ret)
+ return ret;
+
+ ret = cqspi_write_setup(f_pdata, op);
+ if (ret)
+ return ret;
+
+ if (cqspi->use_direct_mode && ((to + len) <= cqspi->ahb_size)) {
+ memcpy_toio(cqspi->ahb_base + to, buf, len);
+ return cqspi_wait_idle(cqspi);
+ }
+
+ return cqspi_indirect_write_execute(f_pdata, to, buf, len);
+}
+
+static void cqspi_rx_dma_callback(void *param)
+{
+ struct cqspi_st *cqspi = param;
+
+ complete(&cqspi->rx_dma_complete);
+}
+
+static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata,
+ u_char *buf, loff_t from, size_t len)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
+ enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+ dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from;
+ int ret = 0;
+ struct dma_async_tx_descriptor *tx;
+ dma_cookie_t cookie;
+ dma_addr_t dma_dst;
+
+ if (!cqspi->rx_chan || !virt_addr_valid(buf)) {
+ memcpy_fromio(buf, cqspi->ahb_base + from, len);
+ return 0;
+ }
+
+ dma_dst = dma_map_single(dev, buf, len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dma_dst)) {
+ dev_err(dev, "dma mapping failed\n");
+ return -ENOMEM;
+ }
+ tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src,
+ len, flags);
+ if (!tx) {
+ dev_err(dev, "device_prep_dma_memcpy error\n");
+ ret = -EIO;
+ goto err_unmap;
+ }
+
+ tx->callback = cqspi_rx_dma_callback;
+ tx->callback_param = cqspi;
+ cookie = tx->tx_submit(tx);
+ reinit_completion(&cqspi->rx_dma_complete);
+
+ ret = dma_submit_error(cookie);
+ if (ret) {
+ dev_err(dev, "dma_submit_error %d\n", cookie);
+ ret = -EIO;
+ goto err_unmap;
+ }
+
+ dma_async_issue_pending(cqspi->rx_chan);
+ if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
+ msecs_to_jiffies(len))) {
+ dmaengine_terminate_sync(cqspi->rx_chan);
+ dev_err(dev, "DMA wait_for_completion_timeout\n");
+ ret = -ETIMEDOUT;
+ goto err_unmap;
+ }
+
+err_unmap:
+ dma_unmap_single(dev, dma_dst, len, DMA_FROM_DEVICE);
+
+ return ret;
+}
+
+static ssize_t cqspi_read(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ loff_t from = op->addr.val;
+ size_t len = op->data.nbytes;
+ u_char *buf = op->data.buf.in;
+ int ret;
+
+ ret = cqspi_set_protocol(f_pdata, op);
+ if (ret)
+ return ret;
+
+ ret = cqspi_read_setup(f_pdata, op);
+ if (ret)
+ return ret;
+
+ if (cqspi->use_direct_mode && ((from + len) <= cqspi->ahb_size))
+ return cqspi_direct_read_execute(f_pdata, buf, from, len);
+
+ return cqspi_indirect_read_execute(f_pdata, buf, from, len);
+}
+
+static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master);
+ struct cqspi_flash_pdata *f_pdata;
+
+ f_pdata = &cqspi->f_pdata[mem->spi->chip_select];
+ cqspi_configure(f_pdata, mem->spi->max_speed_hz);
+
+ if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
+ if (!op->addr.nbytes)
+ return cqspi_command_read(f_pdata, op);
+
+ return cqspi_read(f_pdata, op);
+ }
+
+ if (!op->addr.nbytes || !op->data.buf.out)
+ return cqspi_command_write(f_pdata, op);
+
+ return cqspi_write(f_pdata, op);
+}
+
+static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ int ret;
+
+ ret = cqspi_mem_process(mem, op);
+ if (ret)
+ dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
+
+ return ret;
+}
+
+static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
+ struct cqspi_flash_pdata *f_pdata,
+ struct device_node *np)
+{
+ if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) {
+ dev_err(&pdev->dev, "couldn't determine read-delay\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tshsl-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tchsh-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) {
+ dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static int cqspi_of_get_pdata(struct cqspi_st *cqspi)
+{
+ struct device *dev = &cqspi->pdev->dev;
+ struct device_node *np = dev->of_node;
+
+ cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
+
+ if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) {
+ dev_err(dev, "couldn't determine fifo-depth\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) {
+ dev_err(dev, "couldn't determine fifo-width\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,trigger-address",
+ &cqspi->trigger_address)) {
+ dev_err(dev, "couldn't determine trigger-address\n");
+ return -ENXIO;
+ }
+
+ cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en");
+
+ return 0;
+}
+
+static void cqspi_controller_init(struct cqspi_st *cqspi)
+{
+ u32 reg;
+
+ cqspi_controller_enable(cqspi, 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);
+
+ /* Configure the SRAM split to 1:1 . */
+ writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION);
+
+ /* Load indirect trigger address. */
+ writel(cqspi->trigger_address,
+ cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER);
+
+ /* Program read watermark -- 1/2 of the FIFO. */
+ writel(cqspi->fifo_depth * cqspi->fifo_width / 2,
+ cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK);
+ /* Program write watermark -- 1/8 of the FIFO. */
+ writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
+ cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);
+
+ /* Enable Direct Access Controller */
+ reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+ reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
+ writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+
+ cqspi_controller_enable(cqspi, 1);
+}
+
+static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
+{
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+
+ cqspi->rx_chan = dma_request_chan_by_mask(&mask);
+ if (IS_ERR(cqspi->rx_chan)) {
+ int ret = PTR_ERR(cqspi->rx_chan);
+
+ if (ret != -EPROBE_DEFER)
+ dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
+ cqspi->rx_chan = NULL;
+ return ret;
+ }
+ init_completion(&cqspi->rx_dma_complete);
+
+ return 0;
+}
+
+static const struct spi_controller_mem_ops cqspi_mem_ops = {
+ .exec_op = cqspi_exec_mem_op,
+};
+
+static int cqspi_setup_flash(struct cqspi_st *cqspi)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct cqspi_flash_pdata *f_pdata;
+ unsigned int cs;
+ int ret;
+
+ /* Get flash device data */
+ for_each_available_child_of_node(dev->of_node, np) {
+ ret = of_property_read_u32(np, "reg", &cs);
+ if (ret) {
+ dev_err(dev, "Couldn't determine chip select.\n");
+ return ret;
+ }
+
+ if (cs >= CQSPI_MAX_CHIPSELECT) {
+ dev_err(dev, "Chip select %d out of range.\n", cs);
+ return -EINVAL;
+ }
+
+ f_pdata = &cqspi->f_pdata[cs];
+ f_pdata->cqspi = cqspi;
+ f_pdata->cs = cs;
+
+ ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cqspi_probe(struct platform_device *pdev)
+{
+ const struct cqspi_driver_platdata *ddata;
+ struct reset_control *rstc, *rstc_ocp;
+ struct device *dev = &pdev->dev;
+ struct spi_master *master;
+ struct resource *res_ahb;
+ struct cqspi_st *cqspi;
+ struct resource *res;
+ int ret;
+ int irq;
+
+ 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_RX_DUAL;
+ master->mem_ops = &cqspi_mem_ops;
+ master->dev.of_node = pdev->dev.of_node;
+
+ cqspi = spi_master_get_devdata(master);
+
+ cqspi->pdev = pdev;
+
+ /* Obtain configuration from OF. */
+ ret = cqspi_of_get_pdata(cqspi);
+ if (ret) {
+ dev_err(dev, "Cannot get mandatory OF data.\n");
+ ret = -ENODEV;
+ goto probe_master_put;
+ }
+
+ /* Obtain QSPI clock. */
+ cqspi->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(cqspi->clk)) {
+ dev_err(dev, "Cannot claim QSPI clock.\n");
+ ret = PTR_ERR(cqspi->clk);
+ goto probe_master_put;
+ }
+
+ /* Obtain and remap controller address. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cqspi->iobase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cqspi->iobase)) {
+ dev_err(dev, "Cannot remap controller address.\n");
+ ret = PTR_ERR(cqspi->iobase);
+ goto probe_master_put;
+ }
+
+ /* Obtain and remap AHB address. */
+ res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb);
+ if (IS_ERR(cqspi->ahb_base)) {
+ dev_err(dev, "Cannot remap AHB address.\n");
+ ret = PTR_ERR(cqspi->ahb_base);
+ goto probe_master_put;
+ }
+ cqspi->mmap_phys_base = (dma_addr_t)res_ahb->start;
+ cqspi->ahb_size = resource_size(res_ahb);
+
+ init_completion(&cqspi->transfer_complete);
+
+ /* Obtain IRQ line. */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = -ENXIO;
+ goto probe_master_put;
+ }
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ goto probe_master_put;
+ }
+
+ ret = clk_prepare_enable(cqspi->clk);
+ if (ret) {
+ dev_err(dev, "Cannot enable QSPI clock.\n");
+ goto probe_clk_failed;
+ }
+
+ /* 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");
+ goto probe_reset_failed;
+ }
+
+ 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");
+ goto probe_reset_failed;
+ }
+
+ reset_control_assert(rstc);
+ reset_control_deassert(rstc);
+
+ reset_control_assert(rstc_ocp);
+ reset_control_deassert(rstc_ocp);
+
+ cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
+ ddata = of_device_get_match_data(dev);
+ if (ddata) {
+ if (ddata->quirks & CQSPI_NEEDS_WR_DELAY)
+ cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
+ cqspi->master_ref_clk_hz);
+ if (ddata->hwcaps_mask & CQSPI_SUPPORTS_OCTAL)
+ master->mode_bits |= SPI_RX_OCTAL;
+ if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE))
+ cqspi->use_direct_mode = true;
+ }
+
+ ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
+ pdev->name, cqspi);
+ if (ret) {
+ dev_err(dev, "Cannot request IRQ.\n");
+ goto probe_reset_failed;
+ }
+
+ cqspi_wait_idle(cqspi);
+ cqspi_controller_init(cqspi);
+ cqspi->current_cs = -1;
+ cqspi->sclk = 0;
+
+ ret = cqspi_setup_flash(cqspi);
+ if (ret) {
+ dev_err(dev, "failed to setup flash parameters %d\n", ret);
+ goto probe_setup_failed;
+ }
+
+ if (cqspi->use_direct_mode) {
+ ret = cqspi_request_mmap_dma(cqspi);
+ if (ret == -EPROBE_DEFER)
+ goto probe_setup_failed;
+ }
+
+ ret = devm_spi_register_master(dev, master);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret);
+ goto probe_setup_failed;
+ }
+
+ return 0;
+probe_setup_failed:
+ cqspi_controller_enable(cqspi, 0);
+probe_reset_failed:
+ clk_disable_unprepare(cqspi->clk);
+probe_clk_failed:
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+probe_master_put:
+ spi_master_put(master);
+ return ret;
+}
+
+static int cqspi_remove(struct platform_device *pdev)
+{
+ struct cqspi_st *cqspi = platform_get_drvdata(pdev);
+
+ cqspi_controller_enable(cqspi, 0);
+
+ if (cqspi->rx_chan)
+ dma_release_channel(cqspi->rx_chan);
+
+ clk_disable_unprepare(cqspi->clk);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cqspi_suspend(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_drvdata(dev);
+
+ cqspi_controller_enable(cqspi, 0);
+ return 0;
+}
+
+static int cqspi_resume(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_drvdata(dev);
+
+ cqspi_controller_enable(cqspi, 1);
+ return 0;
+}
+
+static const struct dev_pm_ops cqspi__dev_pm_ops = {
+ .suspend = cqspi_suspend,
+ .resume = cqspi_resume,
+};
+
+#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops)
+#else
+#define CQSPI_DEV_PM_OPS NULL
+#endif
+
+static const struct cqspi_driver_platdata cdns_qspi = {
+ .quirks = CQSPI_DISABLE_DAC_MODE,
+};
+
+static const struct cqspi_driver_platdata k2g_qspi = {
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct cqspi_driver_platdata am654_ospi = {
+ .hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct of_device_id cqspi_dt_ids[] = {
+ {
+ .compatible = "cdns,qspi-nor",
+ .data = &cdns_qspi,
+ },
+ {
+ .compatible = "ti,k2g-qspi",
+ .data = &k2g_qspi,
+ },
+ {
+ .compatible = "ti,am654-ospi",
+ .data = &am654_ospi,
+ },
+ { /* end of table */ }
+};
+
+MODULE_DEVICE_TABLE(of, cqspi_dt_ids);
+
+static struct platform_driver cqspi_platform_driver = {
+ .probe = cqspi_probe,
+ .remove = cqspi_remove,
+ .driver = {
+ .name = CQSPI_NAME,
+ .pm = CQSPI_DEV_PM_OPS,
+ .of_match_table = cqspi_dt_ids,
+ },
+};
+
+module_platform_driver(cqspi_platform_driver);
+
+MODULE_DESCRIPTION("Cadence QSPI Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" CQSPI_NAME);
projects / linux.git / commitdiff