[RFC 2/2] This is a kernel driver for the Cadence QSPI Flash Controller. It uses the spi-nor framework.
Graham Moore
grmoore at opensource.altera.com
Fri Oct 24 11:34:21 PDT 2014
Signed-off-by: Graham Moore <grmoore at opensource.altera.com>
---
drivers/mtd/spi-nor/Kconfig | 6 +
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/cadence-quadspi.c | 1349 +++++++++++++++++++++++++++++++++
3 files changed, 1356 insertions(+)
create mode 100644 drivers/mtd/spi-nor/cadence-quadspi.c
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 64a4f0e..9485481 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -28,4 +28,10 @@ config SPI_FSL_QUADSPI
This enables support for the Quad SPI controller in master mode.
We only connect the NOR to this controller now.
+config SPI_CADENCE_QUADSPI
+ tristate "Cadence Quad SPI controller"
+ depends on ARCH_SOCFPGA
+ help
+ This enables support for the Cadence Quad SPI controller and NOR flash.
+
endif # MTD_SPI_NOR
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index 6a7ce14..372628c 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o
+obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
new file mode 100644
index 0000000..51c65de
--- /dev/null
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -0,0 +1,1349 @@
+/*
+ * Driver for Cadence QSPI Controller
+ *
+ * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/spi/spi.h>
+#include <linux/mtd/spi-nor.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+
+#define CQSPI_NAME "cadence-qspi"
+#define CQSPI_MAX_TRANS (2)
+#define CQSPI_MAX_CHIP_SELECT (16)
+
+struct cqspi_flash_pdata {
+ struct mtd_info mtd;
+ struct spi_nor nor;
+ unsigned int page_size;
+ unsigned int block_size;
+ unsigned int read_delay;
+ unsigned int tshsl_ns;
+ unsigned int tsd2d_ns;
+ unsigned int tchsh_ns;
+ unsigned int tslch_ns;
+};
+
+struct cqspi_st {
+ struct platform_device *pdev;
+ struct device *dev;
+
+ u32 clk_rate;
+ struct clk *clk;
+ unsigned int sclk;
+
+ void __iomem *iobase;
+ void __iomem *ahb_base;
+ struct completion transfer_complete;
+ int irq;
+ unsigned int irq_status;
+ unsigned int irq_mask;
+ int current_cs;
+ unsigned int bus_num;
+ unsigned int num_chipselect;
+ unsigned int ahb_phy_addr;
+ unsigned int master_ref_clk_hz;
+ unsigned int ext_decoder;
+ unsigned int fifo_depth;
+ unsigned int num_chipselects_used;
+ struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIP_SELECT];
+};
+
+static struct of_device_id cqspi_dt_ids[] = {
+ { .compatible = "cdns,qspi-nor",},
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, cqspi_dt_ids);
+
+#define CQSPI_WRITEL __raw_writel
+#define CQSPI_READL __raw_readl
+
+/* Operation timeout value */
+#define CQSPI_TIMEOUT_MS (5000)
+#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 (1 << 0)
+#define CQSPI_REG_CONFIG_DECODE_MASK (1 << 9)
+#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
+#define CQSPI_REG_CONFIG_DMA_MASK (1 << 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_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 (1 << 0)
+#define CQSPI_REG_INDIRECTRD_CANCEL_MASK (1 << 1)
+#define CQSPI_REG_INDIRECTRD_DONE_MASK (1 << 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 (1 << 0)
+#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK (1 << 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 (1 << 0)
+#define CQSPI_REG_INDIRECTWR_CANCEL_MASK (1 << 1)
+#define CQSPI_REG_INDIRECTWR_DONE_MASK (1 << 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 (1 << 0)
+#define CQSPI_REG_IRQ_UNDERFLOW (1 << 1)
+#define CQSPI_REG_IRQ_IND_COMP (1 << 2)
+#define CQSPI_REG_IRQ_IND_RD_REJECT (1 << 3)
+#define CQSPI_REG_IRQ_WR_PROTECTED_ERR (1 << 4)
+#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR (1 << 5)
+#define CQSPI_REG_IRQ_WATERMARK (1 << 6)
+#define CQSPI_REG_IRQ_IND_RD_OVERFLOW (1 << 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_WATERMARK | \
+ CQSPI_REG_IRQ_IND_RD_OVERFLOW | \
+ 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 (0xFFFFFFFF)
+
+#define CQSPI_REG_IS_IDLE(base) \
+ ((CQSPI_READL(base + CQSPI_REG_CONFIG) >> \
+ CQSPI_REG_CONFIG_IDLE_LSB) & 0x1)
+
+#define CQSPI_CAL_DELAY(tdelay_ns, tref_ns, tsclk_ns) \
+ ((((tdelay_ns) - (tsclk_ns)) / (tref_ns)))
+
+#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \
+ (((CQSPI_READL(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
+ CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK)
+
+#define CQSPI_READ_IRQ_STATUS(reg_base) \
+ CQSPI_READL(reg_base + CQSPI_REG_IRQSTATUS)
+
+#define CQSPI_CLEAR_IRQ(reg_base, status) \
+ CQSPI_WRITEL(status, reg_base + CQSPI_REG_IRQSTATUS)
+
+/* forward declarations */
+static void cqspi_switch_cs(struct cqspi_st *cqspi,
+ unsigned int cs);
+static void cqspi_controller_enable(struct cqspi_st *cqspi);
+static void cqspi_controller_disable(struct cqspi_st *cqspi);
+static void cqspi_config_baudrate_div(struct cqspi_st *cqspi,
+ unsigned int ref_clk_hz, unsigned int sclk_hz);
+static void cqspi_delay(struct cqspi_st *cqspi,
+ unsigned int ref_clk, unsigned int sclk_hz);
+static void cqspi_readdata_capture(struct cqspi_st *cqspi,
+ unsigned int bypass, unsigned int delay);
+static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops);
+static unsigned int cqspi_wait_idle(struct cqspi_st *cqspi);
+
+static unsigned int cqspi_init_timeout(const unsigned long timeout_in_ms)
+{
+ return jiffies + msecs_to_jiffies(timeout_in_ms);
+}
+
+static unsigned int cqspi_check_timeout(const unsigned long timeout)
+{
+ return time_before(jiffies, timeout);
+}
+
+static void cqspi_fifo_read(void *dest, const void *src_ahb_addr,
+ unsigned int bytes)
+{
+ unsigned int temp;
+ int remaining = bytes;
+ unsigned int *dest_ptr = (unsigned int *)dest;
+ unsigned int *src_ptr = (unsigned int *)src_ahb_addr;
+
+ while (remaining > 0) {
+ if (remaining >= CQSPI_FIFO_WIDTH) {
+ *dest_ptr = CQSPI_READL(src_ptr);
+ remaining -= CQSPI_FIFO_WIDTH;
+ } else {
+ /* dangling bytes */
+ temp = CQSPI_READL(src_ptr);
+ memcpy(dest_ptr, &temp, remaining);
+ break;
+ }
+ dest_ptr++;
+ }
+}
+
+static void cqspi_fifo_write(void *dest_ahb_addr,
+ const void *src, unsigned int bytes)
+{
+ unsigned int temp;
+ int remaining = bytes;
+ unsigned int *dest_ptr = (unsigned int *)dest_ahb_addr;
+ unsigned int *src_ptr = (unsigned int *)src;
+
+ while (remaining > 0) {
+ if (remaining >= CQSPI_FIFO_WIDTH) {
+ CQSPI_WRITEL(*src_ptr, dest_ptr);
+ remaining -= CQSPI_FIFO_WIDTH;
+ } else {
+ /* dangling bytes */
+ memcpy(&temp, src_ptr, remaining);
+ CQSPI_WRITEL(temp, dest_ptr);
+ break;
+ }
+ src_ptr++;
+ }
+}
+
+static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
+{
+ struct cqspi_st *cqspi = dev;
+
+ /* Read interrupt status */
+ cqspi->irq_status = CQSPI_READ_IRQ_STATUS(cqspi->iobase);
+
+ /* Clear interrupt */
+ CQSPI_CLEAR_IRQ(cqspi->iobase, cqspi->irq_status);
+
+ if (cqspi->irq_status & cqspi->irq_mask)
+ complete(&cqspi->transfer_complete);
+
+ return IRQ_HANDLED;
+}
+
+static int cqspi_find_chipselect(struct spi_nor *nor)
+{
+ int cs;
+ struct cqspi_st *cqspi = nor->priv;
+
+ for (cs = 0; cs < cqspi->num_chipselects_used; cs++)
+ if (nor == &cqspi->f_pdata[cs].nor)
+ break;
+ return cs;
+}
+
+static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int timeout;
+
+ /* Write the CMDCTRL without start execution. */
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CMDCTRL);
+ /* Start execute */
+ reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CMDCTRL);
+
+ /* Polling for completion. */
+ timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS);
+ while (cqspi_check_timeout(timeout)) {
+ reg = CQSPI_READL(reg_base + CQSPI_REG_CMDCTRL) &
+ CQSPI_REG_CMDCTRL_INPROGRESS_MASK;
+ if (!reg)
+ break;
+ }
+
+ if (reg != 0) {
+ dev_err(cqspi->dev, "flash cmd execute time out\n");
+ return -EIO;
+ }
+
+ /* Polling QSPI idle status. */
+ if (!cqspi_wait_idle(cqspi))
+ return -EIO;
+
+ return 0;
+}
+
+static int cqspi_command_read(struct spi_nor *nor,
+ const u8 *txbuf, unsigned n_tx,
+ u8 *rxbuf, unsigned n_rx)
+{
+ unsigned int reg;
+ unsigned int read_len;
+ int status;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+
+ if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || rxbuf == NULL) {
+ dev_err(cqspi->dev, "Invalid input argument, len %d rxbuf 0x%08x\n",
+ n_rx, (unsigned int)rxbuf);
+ return -EINVAL;
+ }
+
+ reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ 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 != 0)
+ return status;
+
+ reg = CQSPI_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 = CQSPI_READL(reg_base + CQSPI_REG_CMDREADDATAUPPER);
+
+ read_len = n_rx - read_len;
+ memcpy(rxbuf, ®, read_len);
+ }
+
+ return 0;
+}
+
+static int cqspi_command_write(struct spi_nor *nor,
+ u8 opcode, const u8 *txbuf, unsigned n_tx)
+{
+ unsigned int reg;
+ unsigned int data;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+
+ if (n_tx > 4 || (n_tx && txbuf == NULL)) {
+ dev_err(cqspi->dev, "Invalid input argument, cmdlen %d txbuf 0x%08x\n",
+ n_tx, (unsigned int)txbuf);
+ return -EINVAL;
+ }
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+ if (n_tx) {
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
+ reg |= (n_tx & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
+ memcpy(&data, txbuf, n_tx);
+ CQSPI_WRITEL(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
+ }
+
+ return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_command_write_addr(struct spi_nor *nor,
+ u8 opcode, unsigned int addr)
+{
+ unsigned int reg;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+ /* Command with address */
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ /* Number of bytes to write. */
+ reg |= ((nor->addr_width-1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+
+ CQSPI_WRITEL(addr, reg_base + CQSPI_REG_CMDADDRESS);
+
+ return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_indirect_read_setup(struct spi_nor *nor,
+ unsigned int from_addr)
+{
+ unsigned int reg;
+ unsigned int dummy_clk;
+ unsigned int dummy_bytes;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int ahb_phy_addr = cqspi->ahb_phy_addr;
+
+ CQSPI_WRITEL((ahb_phy_addr & CQSPI_INDIRECTTRIGGER_ADDR_MASK),
+ reg_base + CQSPI_REG_INDIRECTTRIGGER);
+
+ reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+
+ if (nor->flash_read == SPI_NOR_QUAD)
+ reg |= (CQSPI_INST_TYPE_QUAD
+ << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB);
+
+ CQSPI_WRITEL(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+
+ /* The remaining length is dummy bytes. */
+ dummy_bytes = nor->read_dummy;
+
+ /* Setup dummy clock cycles */
+ if (dummy_bytes) {
+ if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX)
+ dummy_bytes = CQSPI_DUMMY_BYTES_MAX;
+
+ reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
+ /* Set all high to ensure chip doesn't enter XIP */
+ CQSPI_WRITEL(0xFF, reg_base + CQSPI_REG_MODE_BIT);
+
+ /* Convert to clock cycles. */
+ dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE;
+ /* Need to minus the mode byte (8 clocks). */
+ 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;
+ }
+
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+ /* Set device size */
+ reg = CQSPI_READL(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (nor->addr_width - 1);
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_read_execute(struct spi_nor *nor,
+ u8 *rxbuf, unsigned n_rx)
+{
+ int ret = 0;
+ unsigned int reg = 0;
+ unsigned int bytes_to_read = 0;
+ unsigned int timeout;
+ unsigned int watermark = CQSPI_REG_SRAM_THRESHOLD_BYTES;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+ void __iomem *ahb_base = cqspi->ahb_base;
+ int remaining = (int)n_rx;
+
+ if (remaining < watermark)
+ watermark = remaining;
+
+ CQSPI_WRITEL(watermark, reg_base + CQSPI_REG_INDIRECTRDWATERMARK);
+ CQSPI_WRITEL(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
+ CQSPI_WRITEL(cqspi->fifo_depth - CQSPI_REG_SRAM_RESV_WORDS,
+ reg_base + CQSPI_REG_SRAMPARTITION);
+
+ /* Clear all interrupts. */
+ CQSPI_WRITEL(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+ cqspi->irq_mask = CQSPI_IRQ_MASK_RD;
+ CQSPI_WRITEL(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK);
+
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTRD_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+
+ while (remaining > 0) {
+ bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base);
+ if (bytes_to_read != 0) {
+ bytes_to_read *= CQSPI_FIFO_WIDTH;
+ bytes_to_read = bytes_to_read > remaining
+ ? remaining : bytes_to_read;
+ cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read);
+ rxbuf += bytes_to_read;
+ remaining -= bytes_to_read;
+ } else {
+ ret = wait_for_completion_timeout(&cqspi->transfer_complete,
+ CQSPI_TIMEOUT_MS);
+ if (!ret) {
+ dev_err(cqspi->dev, "Indirect read timeout\n");
+ ret = -ETIMEDOUT;
+ goto failrd;
+ }
+ }
+ }
+
+ /* Check indirect done status */
+ timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS);
+ while (cqspi_check_timeout(timeout)) {
+ reg = CQSPI_READL(reg_base + CQSPI_REG_INDIRECTRD);
+ if (reg & CQSPI_REG_INDIRECTRD_DONE_MASK)
+ break;
+ }
+
+ if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) {
+ dev_err(cqspi->dev,
+ "Indirect read completion error 0x%08x\n", reg);
+ ret = -ETIMEDOUT;
+ goto failrd;
+ }
+
+ /* Disable interrupt */
+ CQSPI_WRITEL(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Clear indirect completion status */
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTRD_DONE_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+
+ return 0;
+
+failrd:
+ /* Disable interrupt */
+ CQSPI_WRITEL(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Cancel the indirect read */
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+ return ret;
+}
+
+static int cqspi_indirect_write_setup(struct spi_nor *nor,
+ unsigned int to_addr)
+{
+ unsigned int reg;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+
+ /* Set opcode. */
+ reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_WR_INSTR);
+
+ CQSPI_WRITEL(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+
+ reg = CQSPI_READL(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (nor->addr_width - 1);
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_write_execute(struct spi_nor *nor,
+ const u8 *txbuf, unsigned n_tx)
+{
+ int ret;
+ unsigned int timeout;
+ unsigned int reg = 0;
+ struct cqspi_st *cqspi = nor->priv;
+ void __iomem *reg_base = cqspi->iobase;
+ void __iomem *ahb_base = cqspi->ahb_base;
+ struct cqspi_flash_pdata *f_pdata =
+ &cqspi->f_pdata[cqspi->current_cs];
+
+ unsigned int page_size = f_pdata->page_size;
+ int remaining = (int)n_tx;
+ unsigned int write_bytes;
+
+ CQSPI_WRITEL(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
+
+ CQSPI_WRITEL(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base +
+ CQSPI_REG_INDIRECTWRWATERMARK);
+
+ CQSPI_WRITEL(CQSPI_REG_SRAM_PARTITION_WR,
+ reg_base + CQSPI_REG_SRAMPARTITION);
+
+ /* Clear all interrupts. */
+ CQSPI_WRITEL(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+ cqspi->irq_mask = CQSPI_IRQ_MASK_WR;
+ CQSPI_WRITEL(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK);
+
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTWR_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+
+ /* Write a page or remaining bytes. */
+ write_bytes = remaining > page_size ? page_size : remaining;
+ /* Fill up the data at the beginning */
+ cqspi_fifo_write(ahb_base, txbuf, write_bytes);
+ txbuf += write_bytes;
+ remaining -= write_bytes;
+
+ while (remaining > 0) {
+ ret = wait_for_completion_timeout(&cqspi->transfer_complete,
+ CQSPI_TIMEOUT_MS);
+ if (!ret) {
+ dev_err(cqspi->dev, "Indirect write timeout\n");
+ ret = -ETIMEDOUT;
+ goto failwr;
+ }
+
+ write_bytes = remaining > page_size ?
+ page_size : remaining;
+ cqspi_fifo_write(ahb_base, txbuf,
+ write_bytes);
+ txbuf += write_bytes;
+ remaining -= write_bytes;
+ }
+
+ ret = wait_for_completion_timeout(&cqspi->transfer_complete,
+ CQSPI_TIMEOUT_MS);
+ if (!ret) {
+ dev_err(cqspi->dev, "Indirect write timeout\n");
+ ret = -ETIMEDOUT;
+ goto failwr;
+ }
+
+ /* Check indirect done status */
+ timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS);
+ while (cqspi_check_timeout(timeout)) {
+ reg = CQSPI_READL(reg_base + CQSPI_REG_INDIRECTWR);
+ if (reg & CQSPI_REG_INDIRECTWR_DONE_MASK)
+ break;
+ }
+
+ if (!(reg & CQSPI_REG_INDIRECTWR_DONE_MASK)) {
+ dev_err(cqspi->dev,
+ "Indirect write completion error 0x%08x\n", reg);
+ ret = -ETIMEDOUT;
+ goto failwr;
+ }
+
+ /* Disable interrupt. */
+ CQSPI_WRITEL(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Clear indirect completion status */
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTWR_DONE_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+
+ cqspi_wait_idle(cqspi);
+
+ if (nor->wait_till_ready(nor))
+ goto failwr;
+
+ return 0;
+
+failwr:
+ /* Disable interrupt. */
+ CQSPI_WRITEL(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Cancel the indirect write */
+ CQSPI_WRITEL(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+ return ret;
+}
+
+static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+ int ret;
+
+ ret = cqspi_command_read(nor,
+ &opcode, 1, buf, len);
+ return ret;
+}
+
+static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
+ int write_enable)
+{
+ int ret = 0;
+
+ ret = cqspi_command_write(nor,
+ opcode, buf, len);
+ return ret;
+}
+
+static void cqspi_write(struct spi_nor *nor, loff_t to,
+ size_t len, size_t *retlen, const u_char *buf)
+{
+ int ret;
+
+ ret = cqspi_indirect_write_setup(nor, to);
+ if (ret == 0) {
+ ret = cqspi_indirect_write_execute(nor, buf, len);
+ if (ret == 0)
+ *retlen += len;
+ }
+}
+
+static int cqspi_read(struct spi_nor *nor, loff_t from,
+ size_t len, size_t *retlen, u_char *buf)
+{
+ int ret;
+
+ ret = cqspi_indirect_read_setup(nor, from);
+ if (ret == 0) {
+ ret = cqspi_indirect_read_execute(nor, buf, len);
+ if (ret == 0)
+ *retlen += len;
+ }
+ return ret;
+}
+
+static int cqspi_erase(struct spi_nor *nor, loff_t offs)
+{
+ int ret;
+
+ /* Send write enable, then erase commands. */
+ ret = cqspi_write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
+ if (ret)
+ return ret;
+
+ /* Set up command buffer. */
+ ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs);
+ if (ret)
+ return ret;
+
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+ struct cqspi_st *cqspi = nor->priv;
+ int cs = cqspi_find_chipselect(nor);
+ struct cqspi_flash_pdata *f_pdata;
+ unsigned int sclk;
+
+ /* Switch chip select. */
+ if (cqspi->current_cs != cs) {
+ cqspi->current_cs = cs;
+ cqspi_switch_cs(cqspi, cs);
+ }
+
+ /* Setup baudrate divisor and delays */
+ f_pdata = &cqspi->f_pdata[cqspi->current_cs];
+ sclk = cqspi->clk_rate;
+ if (cqspi->sclk != sclk) {
+ cqspi->sclk = sclk;
+ cqspi_controller_disable(cqspi);
+ cqspi_config_baudrate_div(cqspi,
+ cqspi->master_ref_clk_hz, sclk);
+ cqspi_delay(cqspi,
+ cqspi->master_ref_clk_hz, sclk);
+ cqspi_readdata_capture(cqspi, 1,
+ f_pdata->read_delay);
+ cqspi_controller_enable(cqspi);
+ }
+ return 0;
+}
+
+static void cqspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+}
+
+static int cqspi_of_get_pdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *nc;
+ struct cqspi_st *cqspi = dev_get_platdata(&pdev->dev);
+ struct cqspi_flash_pdata *f_pdata;
+ unsigned int cs;
+ unsigned int prop;
+
+ if (of_property_read_u32(np, "bus-num", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine bus-num\n");
+ return -ENXIO;
+ }
+ cqspi->bus_num = prop;
+
+ if (of_property_read_u32(np, "num-chipselect", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine num-chipselect\n");
+ return -ENXIO;
+ }
+ cqspi->num_chipselect = prop;
+
+ if (of_property_read_u32(np, "ext-decoder", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine ext-decoder\n");
+ return -ENXIO;
+ }
+ cqspi->ext_decoder = prop;
+
+ if (of_property_read_u32(np, "fifo-depth", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine fifo-depth\n");
+ return -ENXIO;
+ }
+ cqspi->fifo_depth = prop;
+
+ /* Get flash devices platform data */
+ cqspi->num_chipselects_used = 0;
+ for_each_child_of_node(np, nc) {
+ if (of_property_read_u32(nc, "reg", &cs)) {
+ dev_err(&pdev->dev, "couldn't determine reg\n");
+ return -ENXIO;
+ }
+
+ f_pdata = &cqspi->f_pdata[cs];
+
+ 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;
+
+ if (of_property_read_u32(nc, "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, "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, "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, "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, "tslch-ns", &prop)) {
+ dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
+ return -ENXIO;
+ }
+ f_pdata->tslch_ns = prop;
+
+ cqspi->num_chipselects_used++;
+ }
+ return 0;
+}
+
+static void cqspi_readdata_capture(struct cqspi_st *cqspi,
+ unsigned int bypass, unsigned int delay)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = CQSPI_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);
+
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_READCAPTURE);
+}
+
+static void cqspi_config_baudrate_div(struct cqspi_st *cqspi,
+ unsigned int ref_clk_hz, unsigned int sclk_hz)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+ unsigned int div;
+
+ reg = CQSPI_READL(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
+
+ div = ref_clk_hz / sclk_hz;
+
+ /* Recalculate the baudrate divisor based on QSPI specification. */
+ if (div > 32)
+ div = 32;
+
+ /* Check if even number. */
+ if (div & 1)
+ div = (div / 2);
+ else
+ div = (div / 2) - 1;
+
+ div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
+ reg |= div;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_chipselect(struct cqspi_st *cqspi,
+ unsigned int chip_select, unsigned int decoder_enable)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = CQSPI_READL(reg_base + CQSPI_REG_CONFIG);
+ /* docoder */
+ if (decoder_enable) {
+ 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;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static unsigned int calculate_ticks_for_ns(unsigned int ref_clk_hz,
+ unsigned int ns_val)
+{
+ unsigned int ticks;
+
+ ticks = ref_clk_hz;
+ ticks /= 1000;
+ ticks *= ns_val;
+ ticks += 999999;
+ ticks /= 1000000;
+ return ticks;
+}
+
+static void cqspi_delay(struct cqspi_st *cqspi,
+ unsigned int ref_clk, unsigned int sclk_hz)
+{
+ void __iomem *iobase = cqspi->iobase;
+ struct cqspi_flash_pdata *f_pdata =
+ &cqspi->f_pdata[cqspi->current_cs];
+ unsigned int ref_clk_ns;
+ unsigned int sclk_ns;
+ unsigned int tshsl, tchsh, tslch, tsd2d;
+ unsigned int reg;
+ unsigned int tsclk;
+
+ /* Convert to ns. */
+ ref_clk_ns = (1000000000) / cqspi->master_ref_clk_hz;
+
+ /* Convert to ns. */
+ sclk_ns = (1000000000) / sclk_hz;
+
+ /* calculate the number of ref ticks for one sclk tick */
+ tsclk = (cqspi->master_ref_clk_hz + sclk_hz - 1) / sclk_hz;
+
+ tshsl = calculate_ticks_for_ns(cqspi->master_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(cqspi->master_ref_clk_hz,
+ f_pdata->tchsh_ns);
+ tslch = calculate_ticks_for_ns(cqspi->master_ref_clk_hz,
+ f_pdata->tslch_ns);
+ tsd2d = calculate_ticks_for_ns(cqspi->master_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);
+ CQSPI_WRITEL(reg, iobase + CQSPI_REG_DELAY);
+}
+
+static void cqspi_switch_cs(struct cqspi_st *cqspi,
+ unsigned int cs)
+{
+ unsigned int reg;
+ struct cqspi_flash_pdata *f_pdata = &cqspi->f_pdata[cs];
+ void __iomem *iobase = cqspi->iobase;
+
+ cqspi_controller_disable(cqspi);
+
+ /* Configure page size and block size. */
+ reg = CQSPI_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);
+ CQSPI_WRITEL(reg, iobase + CQSPI_REG_SIZE);
+
+ /* configure the chip select */
+ cqspi_chipselect(cqspi, cs, cqspi->ext_decoder);
+ cqspi_controller_enable(cqspi);
+}
+
+static void cqspi_controller_enable(struct cqspi_st *cqspi)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = CQSPI_READL(reg_base + CQSPI_REG_CONFIG);
+ reg |= CQSPI_REG_CONFIG_ENABLE_MASK;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_controller_disable(struct cqspi_st *cqspi)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = CQSPI_READL(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK;
+ CQSPI_WRITEL(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static unsigned int cqspi_wait_idle(struct cqspi_st *cqspi)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int count = 0;
+ unsigned timeout;
+
+ timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS);
+ while (cqspi_check_timeout(timeout)) {
+ if (CQSPI_REG_IS_IDLE(reg_base)) {
+ /* Read few times in succession to ensure it does
+ not transition low again */
+ count++;
+ if (count >= CQSPI_POLL_IDLE_RETRY)
+ return 1;
+ } else {
+ count = 0;
+ }
+ }
+
+ /* Timeout, in busy mode. */
+ dev_err(cqspi->dev, "QSPI is still busy after %dms timeout.\n",
+ CQSPI_TIMEOUT_MS);
+ return 0;
+}
+
+static void cqspi_controller_init(struct cqspi_st *cqspi)
+{
+ cqspi_controller_disable(cqspi);
+
+ /* Configure the remap address register, no remap */
+ CQSPI_WRITEL(0, cqspi->iobase + CQSPI_REG_REMAP);
+
+ /* Disable all interrupts. */
+ CQSPI_WRITEL(0, cqspi->iobase + CQSPI_REG_IRQMASK);
+
+ cqspi_controller_enable(cqspi);
+}
+
+static int cqspi_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct mtd_part_parser_data ppdata;
+ struct device *dev = &pdev->dev;
+ struct cqspi_st *cqspi;
+ struct spi_nor *nor;
+ struct mtd_info *mtd;
+ struct resource *res;
+ struct resource *res_ahb;
+ int ret;
+ int i;
+
+ cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL);
+ if (!cqspi)
+ return -ENOMEM;
+ pdev->dev.platform_data = cqspi;
+
+ ret = cqspi_of_get_pdata(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "Get platform data failed.\n");
+ return -ENODEV;
+ }
+
+ cqspi->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(cqspi->clk)) {
+ dev_err(&pdev->dev, "cannot get qspi clk\n");
+ ret = PTR_ERR(cqspi->clk);
+ goto probe_failed;
+ }
+ cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cqspi->iobase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(cqspi->iobase)) {
+ dev_err(&pdev->dev, "devm_ioremap_resource res 0 failed\n");
+ ret = PTR_ERR(cqspi->iobase);
+ goto probe_failed;
+ }
+
+ res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ cqspi->ahb_phy_addr = res_ahb->start;
+ cqspi->ahb_base = devm_ioremap_resource(&pdev->dev, res_ahb);
+ if (IS_ERR(cqspi->ahb_base)) {
+ dev_err(&pdev->dev, "devm_ioremap_resource res 1 failed\n");
+ ret = PTR_ERR(cqspi->ahb_base);
+ goto probe_failed;
+ }
+
+ init_completion(&cqspi->transfer_complete);
+
+ cqspi->irq = platform_get_irq(pdev, 0);
+ if (cqspi->irq < 0) {
+ dev_err(&pdev->dev, "platform_get_irq failed\n");
+ ret = -ENXIO;
+ goto probe_failed;
+ }
+ ret = devm_request_irq(&pdev->dev, cqspi->irq,
+ cqspi_irq_handler,
+ 0, pdev->name, cqspi);
+ if (ret) {
+ dev_err(&pdev->dev, "devm_request_irq failed\n");
+ goto probe_failed;
+ }
+
+ cqspi_wait_idle(cqspi);
+ cqspi_controller_init(cqspi);
+ cqspi->current_cs = -1;
+ cqspi->sclk = 0;
+
+ /* iterate the subnodes. */
+ i = 0;
+ for_each_available_child_of_node(dev->of_node, np) {
+ char modalias[40];
+
+ nor = &cqspi->f_pdata[i].nor;
+ mtd = &cqspi->f_pdata[i].mtd;
+
+ nor->mtd = mtd;
+ nor->dev = dev;
+ nor->priv = cqspi;
+ mtd->priv = nor;
+
+ /* fill the hooks */
+ nor->read_reg = cqspi_read_reg;
+ nor->write_reg = cqspi_write_reg;
+ nor->read = cqspi_read;
+ nor->write = cqspi_write;
+ nor->erase = cqspi_erase;
+
+ nor->prepare = cqspi_prep;
+ nor->unprepare = cqspi_unprep;
+
+ if (of_modalias_node(np, modalias, sizeof(modalias)) < 0)
+ goto probe_failed;
+
+ ret = spi_nor_scan(nor, modalias, SPI_NOR_QUAD);
+ if (ret)
+ goto probe_failed;
+
+ ret = of_property_read_u32(np, "spi-max-frequency",
+ &cqspi->clk_rate);
+ if (ret < 0)
+ goto probe_failed;
+
+ ppdata.of_node = np;
+ ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
+ if (ret)
+ goto probe_failed;
+
+ i++;
+ if (i == CQSPI_MAX_CHIP_SELECT)
+ break;
+ }
+ dev_info(dev, "Cadence QSPI NOR flash driver\n");
+ return 0;
+
+probe_failed:
+ dev_err(dev, "Cadence QSPI probe failed\n");
+ return ret;
+}
+
+static void set_all_into_3byte_mode(struct cqspi_st *cqspi)
+{
+ int i;
+
+ /* set all devices into 3-byte address mode */
+ for (i = 0; i < cqspi->num_chipselects_used; i++) {
+ struct spi_nor *nor = &cqspi->f_pdata[i].nor;
+
+ nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
+ nor->write_reg(nor, SPINOR_OP_EX4B, NULL, 0, 0);
+ nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0, 0);
+ }
+}
+
+static int cqspi_remove(struct platform_device *pdev)
+{
+ struct cqspi_st *cqspi = dev_get_platdata(&pdev->dev);
+ int i;
+
+ set_all_into_3byte_mode(cqspi);
+
+ cqspi_controller_disable(cqspi);
+
+ for (i = 0; i < cqspi->num_chipselects_used; i++)
+ mtd_device_unregister(&cqspi->f_pdata[i].mtd);
+
+ return 0;
+}
+
+static void cqspi_shutdown(struct platform_device *pdev)
+{
+ struct cqspi_st *cqspi = dev_get_platdata(&pdev->dev);
+
+ set_all_into_3byte_mode(cqspi);
+}
+
+#ifdef CONFIG_PM
+static int cqspi_suspend(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_platdata(dev);
+
+ cqspi_controller_disable(cqspi);
+ return 0;
+}
+
+static int cqspi_resume(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_platdata(dev);
+
+ cqspi_controller_enable(cqspi);
+ 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 struct platform_driver cqspi_platform_driver = {
+ .probe = cqspi_probe,
+ .remove = cqspi_remove,
+ .shutdown = cqspi_shutdown,
+ .driver = {
+ .name = CQSPI_NAME,
+ .owner = THIS_MODULE,
+ .bus = &platform_bus_type,
+ .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);
+MODULE_AUTHOR("Ley Foon Tan <lftan at altera.com>");
+MODULE_AUTHOR("Graham Moore <grmoore at opensource.altera.com>");
--
1.7.9.5
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