#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
/* Name of this driver */
#define CDNS_SPI_NAME "cdns-spi"
/* Register offset definitions */
-#define CDNS_SPI_CR_OFFSET 0x00 /* Configuration Register, RW */
-#define CDNS_SPI_ISR_OFFSET 0x04 /* Interrupt Status Register, RO */
-#define CDNS_SPI_IER_OFFSET 0x08 /* Interrupt Enable Register, WO */
-#define CDNS_SPI_IDR_OFFSET 0x0c /* Interrupt Disable Register, WO */
-#define CDNS_SPI_IMR_OFFSET 0x10 /* Interrupt Enabled Mask Register, RO */
-#define CDNS_SPI_ER_OFFSET 0x14 /* Enable/Disable Register, RW */
-#define CDNS_SPI_DR_OFFSET 0x18 /* Delay Register, RW */
-#define CDNS_SPI_TXD_OFFSET 0x1C /* Data Transmit Register, WO */
-#define CDNS_SPI_RXD_OFFSET 0x20 /* Data Receive Register, RO */
-#define CDNS_SPI_SICR_OFFSET 0x24 /* Slave Idle Count Register, RW */
-#define CDNS_SPI_THLD_OFFSET 0x28 /* Transmit FIFO Watermark Register,RW */
-
+#define CDNS_SPI_CR 0x00 /* Configuration Register, RW */
+#define CDNS_SPI_ISR 0x04 /* Interrupt Status Register, RO */
+#define CDNS_SPI_IER 0x08 /* Interrupt Enable Register, WO */
+#define CDNS_SPI_IDR 0x0c /* Interrupt Disable Register, WO */
+#define CDNS_SPI_IMR 0x10 /* Interrupt Enabled Mask Register, RO */
+#define CDNS_SPI_ER 0x14 /* Enable/Disable Register, RW */
+#define CDNS_SPI_DR 0x18 /* Delay Register, RW */
+#define CDNS_SPI_TXD 0x1C /* Data Transmit Register, WO */
+#define CDNS_SPI_RXD 0x20 /* Data Receive Register, RO */
+#define CDNS_SPI_SICR 0x24 /* Slave Idle Count Register, RW */
+#define CDNS_SPI_THLD 0x28 /* Transmit FIFO Watermark Register,RW */
+
+#define SPI_AUTOSUSPEND_TIMEOUT 3000
/*
* SPI Configuration Register bit Masks
*
* This register contains various control bits that affect the operation
* of the SPI controller
*/
-#define CDNS_SPI_CR_MANSTRT_MASK 0x00010000 /* Manual TX Start */
-#define CDNS_SPI_CR_CPHA_MASK 0x00000004 /* Clock Phase Control */
-#define CDNS_SPI_CR_CPOL_MASK 0x00000002 /* Clock Polarity Control */
-#define CDNS_SPI_CR_SSCTRL_MASK 0x00003C00 /* Slave Select Mask */
-#define CDNS_SPI_CR_PERI_SEL_MASK 0x00000200 /* Peripheral Select Decode */
-#define CDNS_SPI_CR_BAUD_DIV_MASK 0x00000038 /* Baud Rate Divisor Mask */
-#define CDNS_SPI_CR_MSTREN_MASK 0x00000001 /* Master Enable Mask */
-#define CDNS_SPI_CR_MANSTRTEN_MASK 0x00008000 /* Manual TX Enable Mask */
-#define CDNS_SPI_CR_SSFORCE_MASK 0x00004000 /* Manual SS Enable Mask */
-#define CDNS_SPI_CR_BAUD_DIV_4_MASK 0x00000008 /* Default Baud Div Mask */
-#define CDNS_SPI_CR_DEFAULT_MASK (CDNS_SPI_CR_MSTREN_MASK | \
- CDNS_SPI_CR_SSCTRL_MASK | \
- CDNS_SPI_CR_SSFORCE_MASK | \
- CDNS_SPI_CR_BAUD_DIV_4_MASK)
+#define CDNS_SPI_CR_MANSTRT 0x00010000 /* Manual TX Start */
+#define CDNS_SPI_CR_CPHA 0x00000004 /* Clock Phase Control */
+#define CDNS_SPI_CR_CPOL 0x00000002 /* Clock Polarity Control */
+#define CDNS_SPI_CR_SSCTRL 0x00003C00 /* Slave Select Mask */
+#define CDNS_SPI_CR_PERI_SEL 0x00000200 /* Peripheral Select Decode */
+#define CDNS_SPI_CR_BAUD_DIV 0x00000038 /* Baud Rate Divisor Mask */
+#define CDNS_SPI_CR_MSTREN 0x00000001 /* Master Enable Mask */
+#define CDNS_SPI_CR_MANSTRTEN 0x00008000 /* Manual TX Enable Mask */
+#define CDNS_SPI_CR_SSFORCE 0x00004000 /* Manual SS Enable Mask */
+#define CDNS_SPI_CR_BAUD_DIV_4 0x00000008 /* Default Baud Div Mask */
+#define CDNS_SPI_CR_DEFAULT (CDNS_SPI_CR_MSTREN | \
+ CDNS_SPI_CR_SSCTRL | \
+ CDNS_SPI_CR_SSFORCE | \
+ CDNS_SPI_CR_BAUD_DIV_4)
/*
* SPI Configuration Register - Baud rate and slave select
* All the four interrupt registers (Status/Mask/Enable/Disable) have the same
* bit definitions.
*/
-#define CDNS_SPI_IXR_TXOW_MASK 0x00000004 /* SPI TX FIFO Overwater */
-#define CDNS_SPI_IXR_MODF_MASK 0x00000002 /* SPI Mode Fault */
-#define CDNS_SPI_IXR_RXNEMTY_MASK 0x00000010 /* SPI RX FIFO Not Empty */
-#define CDNS_SPI_IXR_DEFAULT_MASK (CDNS_SPI_IXR_TXOW_MASK | \
- CDNS_SPI_IXR_MODF_MASK)
-#define CDNS_SPI_IXR_TXFULL_MASK 0x00000008 /* SPI TX Full */
-#define CDNS_SPI_IXR_ALL_MASK 0x0000007F /* SPI all interrupts */
+#define CDNS_SPI_IXR_TXOW 0x00000004 /* SPI TX FIFO Overwater */
+#define CDNS_SPI_IXR_MODF 0x00000002 /* SPI Mode Fault */
+#define CDNS_SPI_IXR_RXNEMTY 0x00000010 /* SPI RX FIFO Not Empty */
+#define CDNS_SPI_IXR_DEFAULT (CDNS_SPI_IXR_TXOW | \
+ CDNS_SPI_IXR_MODF)
+#define CDNS_SPI_IXR_TXFULL 0x00000008 /* SPI TX Full */
+#define CDNS_SPI_IXR_ALL 0x0000007F /* SPI all interrupts */
/*
* SPI Enable Register bit Masks
*
* This register is used to enable or disable the SPI controller
*/
-#define CDNS_SPI_ER_ENABLE_MASK 0x00000001 /* SPI Enable Bit Mask */
-#define CDNS_SPI_ER_DISABLE_MASK 0x0 /* SPI Disable Bit Mask */
+#define CDNS_SPI_ER_ENABLE 0x00000001 /* SPI Enable Bit Mask */
+#define CDNS_SPI_ER_DISABLE 0x0 /* SPI Disable Bit Mask */
/* SPI FIFO depth in bytes */
#define CDNS_SPI_FIFO_DEPTH 128
*/
static void cdns_spi_init_hw(struct cdns_spi *xspi)
{
- u32 ctrl_reg = CDNS_SPI_CR_DEFAULT_MASK;
+ u32 ctrl_reg = CDNS_SPI_CR_DEFAULT;
if (xspi->is_decoded_cs)
- ctrl_reg |= CDNS_SPI_CR_PERI_SEL_MASK;
+ ctrl_reg |= CDNS_SPI_CR_PERI_SEL;
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_DISABLE_MASK);
- cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
- CDNS_SPI_IXR_ALL_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
+ cdns_spi_write(xspi, CDNS_SPI_IDR, CDNS_SPI_IXR_ALL);
/* Clear the RX FIFO */
- while (cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET) &
- CDNS_SPI_IXR_RXNEMTY_MASK)
- cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
-
- cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET,
- CDNS_SPI_IXR_ALL_MASK);
- cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_ENABLE_MASK);
+ while (cdns_spi_read(xspi, CDNS_SPI_ISR) & CDNS_SPI_IXR_RXNEMTY)
+ cdns_spi_read(xspi, CDNS_SPI_RXD);
+
+ cdns_spi_write(xspi, CDNS_SPI_ISR, CDNS_SPI_IXR_ALL);
+ cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE);
}
/**
* cdns_spi_chipselect - Select or deselect the chip select line
* @spi: Pointer to the spi_device structure
- * @is_on: Select(0) or deselect (1) the chip select line
+ * @is_high: Select(0) or deselect (1) the chip select line
*/
static void cdns_spi_chipselect(struct spi_device *spi, bool is_high)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg;
- ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR);
if (is_high) {
/* Deselect the slave */
- ctrl_reg |= CDNS_SPI_CR_SSCTRL_MASK;
+ ctrl_reg |= CDNS_SPI_CR_SSCTRL;
} else {
/* Select the slave */
- ctrl_reg &= ~CDNS_SPI_CR_SSCTRL_MASK;
+ ctrl_reg &= ~CDNS_SPI_CR_SSCTRL;
if (!(xspi->is_decoded_cs))
ctrl_reg |= ((~(CDNS_SPI_SS0 << spi->chip_select)) <<
CDNS_SPI_SS_SHIFT) &
- CDNS_SPI_CR_SSCTRL_MASK;
+ CDNS_SPI_CR_SSCTRL;
else
ctrl_reg |= (spi->chip_select << CDNS_SPI_SS_SHIFT) &
- CDNS_SPI_CR_SSCTRL_MASK;
+ CDNS_SPI_CR_SSCTRL;
}
- cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+ cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg);
}
/**
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg, new_ctrl_reg;
- new_ctrl_reg = ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+ new_ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR);
+ ctrl_reg = new_ctrl_reg;
/* Set the SPI clock phase and clock polarity */
- new_ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
+ new_ctrl_reg &= ~(CDNS_SPI_CR_CPHA | CDNS_SPI_CR_CPOL);
if (spi->mode & SPI_CPHA)
- new_ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
+ new_ctrl_reg |= CDNS_SPI_CR_CPHA;
if (spi->mode & SPI_CPOL)
- new_ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
+ new_ctrl_reg |= CDNS_SPI_CR_CPOL;
if (new_ctrl_reg != ctrl_reg) {
/*
* polarity as it will cause the SPI slave to see spurious clock
* transitions. To workaround the issue toggle the ER register.
*/
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_DISABLE_MASK);
- cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, new_ctrl_reg);
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_ENABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
+ cdns_spi_write(xspi, CDNS_SPI_CR, new_ctrl_reg);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE);
}
}
* controller.
*/
static void cdns_spi_config_clock_freq(struct spi_device *spi,
- struct spi_transfer *transfer)
+ struct spi_transfer *transfer)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg, baud_rate_val;
frequency = clk_get_rate(xspi->ref_clk);
- ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR);
/* Set the clock frequency */
if (xspi->speed_hz != transfer->speed_hz) {
(frequency / (2 << baud_rate_val)) > transfer->speed_hz)
baud_rate_val++;
- ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV_MASK;
+ ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV;
ctrl_reg |= baud_rate_val << CDNS_SPI_BAUD_DIV_SHIFT;
xspi->speed_hz = frequency / (2 << baud_rate_val);
}
- cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+ cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg);
}
/**
while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) &&
(xspi->tx_bytes > 0)) {
if (xspi->txbuf)
- cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET,
- *xspi->txbuf++);
+ cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++);
else
- cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET, 0);
+ cdns_spi_write(xspi, CDNS_SPI_TXD, 0);
xspi->tx_bytes--;
trans_cnt++;
u32 intr_status, status;
status = IRQ_NONE;
- intr_status = cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET);
- cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET, intr_status);
+ intr_status = cdns_spi_read(xspi, CDNS_SPI_ISR);
+ cdns_spi_write(xspi, CDNS_SPI_ISR, intr_status);
- if (intr_status & CDNS_SPI_IXR_MODF_MASK) {
+ if (intr_status & CDNS_SPI_IXR_MODF) {
/* Indicate that transfer is completed, the SPI subsystem will
* identify the error as the remaining bytes to be
* transferred is non-zero
*/
- cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
- CDNS_SPI_IXR_DEFAULT_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_IDR, CDNS_SPI_IXR_DEFAULT);
spi_finalize_current_transfer(master);
status = IRQ_HANDLED;
- } else if (intr_status & CDNS_SPI_IXR_TXOW_MASK) {
+ } else if (intr_status & CDNS_SPI_IXR_TXOW) {
unsigned long trans_cnt;
trans_cnt = xspi->rx_bytes - xspi->tx_bytes;
while (trans_cnt) {
u8 data;
- data = cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
+ data = cdns_spi_read(xspi, CDNS_SPI_RXD);
if (xspi->rxbuf)
*xspi->rxbuf++ = data;
cdns_spi_fill_tx_fifo(xspi);
} else {
/* Transfer is completed */
- cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
- CDNS_SPI_IXR_DEFAULT_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_IDR,
+ CDNS_SPI_IXR_DEFAULT);
spi_finalize_current_transfer(master);
}
status = IRQ_HANDLED;
return status;
}
+
static int cdns_prepare_message(struct spi_master *master,
struct spi_message *msg)
{
cdns_spi_fill_tx_fifo(xspi);
- cdns_spi_write(xspi, CDNS_SPI_IER_OFFSET,
- CDNS_SPI_IXR_DEFAULT_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_IER, CDNS_SPI_IXR_DEFAULT);
return transfer->len;
}
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_ENABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE);
return 0;
}
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_DISABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
return 0;
}
u32 num_cs;
master = spi_alloc_master(&pdev->dev, sizeof(*xspi));
- if (master == NULL)
+ if (!master)
return -ENOMEM;
xspi = spi_master_get_devdata(master);
goto clk_dis_apb;
}
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
+ pm_runtime_set_active(&pdev->dev);
+
ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
if (ret < 0)
master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
/* SPI controller initializations */
cdns_spi_init_hw(xspi);
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
+
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
ret = -ENXIO;
dev_err(&pdev->dev, "irq number is invalid\n");
- goto remove_master;
+ goto clk_dis_all;
}
ret = devm_request_irq(&pdev->dev, irq, cdns_spi_irq,
if (ret != 0) {
ret = -ENXIO;
dev_err(&pdev->dev, "request_irq failed\n");
- goto remove_master;
+ goto clk_dis_all;
}
master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
master->transfer_one = cdns_transfer_one;
master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware;
master->set_cs = cdns_spi_chipselect;
+ master->auto_runtime_pm = true;
master->mode_bits = SPI_CPOL | SPI_CPHA;
/* Set to default valid value */
return ret;
clk_dis_all:
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(xspi->ref_clk);
clk_dis_apb:
clk_disable_unprepare(xspi->pclk);
struct spi_master *master = platform_get_drvdata(pdev);
struct cdns_spi *xspi = spi_master_get_devdata(master);
- cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
- CDNS_SPI_ER_DISABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
clk_disable_unprepare(xspi->ref_clk);
clk_disable_unprepare(xspi->pclk);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
spi_unregister_master(master);
* This function disables the SPI controller and
* changes the driver state to "suspend"
*
- * Return: Always 0
+ * Return: 0 on success and error value on error
*/
static int __maybe_unused cdns_spi_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct spi_master *master = platform_get_drvdata(pdev);
- struct cdns_spi *xspi = spi_master_get_devdata(master);
-
- spi_master_suspend(master);
-
- clk_disable_unprepare(xspi->ref_clk);
-
- clk_disable_unprepare(xspi->pclk);
- return 0;
+ return spi_master_suspend(master);
}
/**
{
struct platform_device *pdev = to_platform_device(dev);
struct spi_master *master = platform_get_drvdata(pdev);
+
+ return spi_master_resume(master);
+}
+
+/**
+ * cdns_spi_runtime_resume - Runtime resume method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function enables the clocks
+ *
+ * Return: 0 on success and error value on error
+ */
+static int __maybe_unused cnds_runtime_resume(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
struct cdns_spi *xspi = spi_master_get_devdata(master);
- int ret = 0;
+ int ret;
ret = clk_prepare_enable(xspi->pclk);
if (ret) {
clk_disable(xspi->pclk);
return ret;
}
- spi_master_resume(master);
+ return 0;
+}
+
+/**
+ * cdns_spi_runtime_suspend - Runtime suspend method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function disables the clocks
+ *
+ * Return: Always 0
+ */
+static int __maybe_unused cnds_runtime_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ clk_disable_unprepare(xspi->ref_clk);
+ clk_disable_unprepare(xspi->pclk);
return 0;
}
-static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
- cdns_spi_resume);
+static const struct dev_pm_ops cdns_spi_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(cnds_runtime_suspend,
+ cnds_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(cdns_spi_suspend, cdns_spi_resume)
+};
static const struct of_device_id cdns_spi_of_match[] = {
{ .compatible = "xlnx,zynq-spi-r1p6" },
projects / linux-2.6-block.git / commitdiff