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Subject[PATCH v12 4/4] spi: cadence-quadspi: Add qspi support for Intel LGM SoC
Date
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

Add support for the Cadence QSPI controller. This controller support
on the Intel Lightning Mountain(LGM), TI and Altera SoC's.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
drivers/spi/spi-cadence-quadspi.c | 137 ++++++++++++++++++++++++++++++--------
1 file changed, 111 insertions(+), 26 deletions(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 7b52e109036e..3afe0aac8447 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1,11 +1,11 @@
// 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
- */
+//
+// 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>
@@ -35,6 +35,7 @@
/* Quirks */
#define CQSPI_NEEDS_WR_DELAY BIT(0)
#define CQSPI_DISABLE_DAC_MODE BIT(1)
+#define CQSPI_NEEDS_ADDR_SWAP BIT(1)

/* Capabilities*/
#define CQSPI_SUPPORTS_OCTAL BIT(0)
@@ -76,6 +77,8 @@ struct cqspi_st {
unsigned long master_ref_clk_hz;
u32 fifo_depth;
u32 fifo_width;
+ u32 bus_num;
+ u32 num_chipselect;
bool rclk_en;
u32 trigger_address;
u32 wr_delay;
@@ -132,6 +135,9 @@ struct cqspi_driver_platdata {
#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_WR_INSTR_TYPE_ADDR_MASK 3
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_MASK 3
+#define CQSPI_REG_WR_INSTR_TYPE_WEL_DIS_POS 8

#define CQSPI_REG_DELAY 0x0C
#define CQSPI_REG_DELAY_TSLCH_LSB 0
@@ -262,25 +268,43 @@ static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi)
return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
}

-static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
+static irqreturn_t cqspi_irq_handler(int irq, void *dev_id)
{
- struct cqspi_st *cqspi = dev;
+ struct cqspi_st *cqspi = dev_id;
unsigned int irq_status;

+ if (readl(cqspi->iobase + CQSPI_REG_IRQSTATUS) == 0)
+ return IRQ_NONE;
+
/* 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);
+ complete(&cqspi->transfer_complete);

return IRQ_HANDLED;
}

+static u32 cqspi_cmd2addr(const struct spi_mem_op *op)
+{
+ const u8 *addrbuf = (u8 *)&op->addr.val;
+ unsigned int addr = 0;
+ int i;
+
+ /* Invalid address return zero. */
+ if (op->addr.nbytes > 4)
+ return 0;
+
+ for (i = 0; i < op->addr.nbytes; i++) {
+ addr = addr << 8;
+ addr |= addrbuf[i];
+ }
+
+ return addr;
+}
+
static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata)
{
u32 rdreg = 0;
@@ -352,11 +376,14 @@ static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
static int cqspi_command_read(struct cqspi_flash_pdata *f_pdata,
const struct spi_mem_op *op)
{
+ const struct cqspi_driver_platdata *ddata;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
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 addr_value;
unsigned int rdreg;
unsigned int reg;
size_t read_len;
@@ -376,6 +403,16 @@ static int cqspi_command_read(struct cqspi_flash_pdata *f_pdata,

reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);

+ ddata = of_device_get_match_data(dev);
+ if ((ddata->quirks & CQSPI_NEEDS_ADDR_SWAP) & op->addr.nbytes) {
+ reg |= BIT(CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((op->addr.nbytes - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+ addr_value = cqspi_cmd2addr(op);
+
+ writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS);
+ }
+
/* 0 means 1 byte. */
reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
<< CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
@@ -424,7 +461,7 @@ static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata,
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;
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;

writel(op->addr.val, reg_base + CQSPI_REG_CMDADDRESS);
}
@@ -453,10 +490,20 @@ static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata,
static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata,
const struct spi_mem_op *op)
{
+ const struct cqspi_driver_platdata *ddata;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;
+ struct device *dev = &cqspi->pdev->dev;
+ unsigned int reg, addr_value;
unsigned int dummy_clk = 0;
- unsigned int reg;
+
+ ddata = of_device_get_match_data(dev);
+ if ((ddata->quirks & CQSPI_NEEDS_ADDR_SWAP) & op->addr.nbytes) {
+ addr_value = cqspi_cmd2addr(op);
+ writel(addr_value, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+ reg |= (op->data.buswidth & CQSPI_REG_RD_INSTR_TYPE_DATA_MASK)
+ << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
+ }

reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
reg |= cqspi_calc_rdreg(f_pdata);
@@ -468,7 +515,7 @@ static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata,

if (dummy_clk / 8)
reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
- << CQSPI_REG_RD_INSTR_DUMMY_LSB;
+ << CQSPI_REG_RD_INSTR_DUMMY_LSB;

writel(reg, reg_base + CQSPI_REG_RD_INSTR);

@@ -508,7 +555,7 @@ static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,

while (remaining > 0) {
if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
+ msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
ret = -ETIMEDOUT;

bytes_to_read = cqspi_get_rd_sram_level(cqspi);
@@ -575,9 +622,12 @@ static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,
static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata,
const struct spi_mem_op *op)
{
- unsigned int reg;
+ const struct cqspi_driver_platdata *ddata;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
void __iomem *reg_base = cqspi->iobase;
+ const u8 *txbuf = &op->cmd.opcode;
+ unsigned int reg;

/* Set opcode. */
reg = op->cmd.opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
@@ -585,6 +635,24 @@ static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata,
reg = cqspi_calc_rdreg(f_pdata);
writel(reg, reg_base + CQSPI_REG_RD_INSTR);

+ ddata = of_device_get_match_data(dev);
+ if (ddata->quirks & CQSPI_NEEDS_ADDR_SWAP) {
+ /* Set opcode. */
+ reg = txbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ reg |= BIT(CQSPI_REG_WR_INSTR_TYPE_WEL_DIS_POS);
+ /* Configure the mode for address */
+ reg |= (op->addr.buswidth & CQSPI_REG_WR_INSTR_TYPE_ADDR_MASK)
+ << CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB;
+
+ /* Configure the mode for data */
+ reg |= (op->data.buswidth & CQSPI_REG_WR_INSTR_TYPE_DATA_MASK)
+ << CQSPI_REG_WR_INSTR_TYPE_DATA_LSB;
+ writel(reg, reg_base + CQSPI_REG_WR_INSTR);
+ /* Setup write address. */
+ reg = cqspi_cmd2addr(op);
+ writel(reg, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+ }
+
reg = readl(reg_base + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
reg |= (op->addr.nbytes - 1);
@@ -644,7 +712,7 @@ static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata,
}

if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
+ msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
dev_err(dev, "Indirect write timeout\n");
ret = -ETIMEDOUT;
goto failwr;
@@ -903,7 +971,7 @@ 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;
+ struct device *dev = cqspi->rx_chan->device->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;
@@ -1053,6 +1121,8 @@ 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;
@@ -1098,10 +1168,6 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);

- /*
- * Disable Direct Access Controller and Auto polling when not
- * supported.
- */
if (!cqspi->use_dac_mode) {
u32 reg;

@@ -1128,7 +1194,7 @@ static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
if (IS_ERR(cqspi->rx_chan)) {
int ret = PTR_ERR(cqspi->rx_chan);

- if (ret == -EPROBE_DEFER)
+ if (ret != -EPROBE_DEFER)
dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
cqspi->rx_chan = NULL;

@@ -1273,6 +1339,11 @@ static int cqspi_probe(struct platform_device *pdev)

cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
ddata = of_device_get_match_data(dev);
+ if (!ddata) {
+ dev_err(dev, "Could not retrieve QSPI caps\n");
+ goto probe_reset_failed;
+ }
+
if (ddata) {
if (ddata->quirks & CQSPI_NEEDS_WR_DELAY)
cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
@@ -1281,9 +1352,15 @@ static int cqspi_probe(struct platform_device *pdev)
master->mode_bits |= SPI_RX_OCTAL;
if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE))
cqspi->use_dac_mode = true;
+ if (ddata->quirks & CQSPI_NEEDS_ADDR_SWAP) {
+ master->bus_num = 0;
+ master->num_chipselect = 2;
+ master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA |
+ SPI_TX_QUAD;
+ }
}

- ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
+ ret = devm_request_irq(dev, irq, cqspi_irq_handler, IRQF_SHARED,
pdev->name, cqspi);
if (ret) {
dev_err(dev, "Cannot request IRQ.\n");
@@ -1381,6 +1458,10 @@ static const struct cqspi_driver_platdata am654_ospi = {
.quirks = CQSPI_NEEDS_WR_DELAY,
};

+static const struct cqspi_driver_platdata intel_lgm_qspi = {
+ .quirks = CQSPI_NEEDS_ADDR_SWAP,
+};
+
static const struct of_device_id cqspi_dt_ids[] = {
{
.compatible = "cdns,qspi-nor",
@@ -1394,6 +1475,10 @@ static const struct of_device_id cqspi_dt_ids[] = {
.compatible = "ti,am654-ospi",
.data = &am654_ospi,
},
+ {
+ .compatible = "intel,lgm-qspi",
+ .data = &intel_lgm_qspi,
+ },
{ /* end of table */ }
};

--
2.11.0
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