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linux-sg2042/drivers/spi/spi-cadence.c

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/*
* Cadence SPI controller driver (master mode only)
*
* Copyright (C) 2008 - 2014 Xilinx, Inc.
*
* based on Blackfin On-Chip SPI Driver (spi_bfin5xx.c)
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/platform_device.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 */
/*
* 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_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)
/*
* SPI Configuration Register - Baud rate and slave select
*
* These are the values used in the calculation of baud rate divisor and
* setting the slave select.
*/
#define CDNS_SPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */
#define CDNS_SPI_BAUD_DIV_MIN 1 /* Baud rate divisor minimum */
#define CDNS_SPI_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift in CR */
#define CDNS_SPI_SS_SHIFT 10 /* Slave Select field shift in CR */
#define CDNS_SPI_SS0 0x1 /* Slave Select zero */
/*
* SPI Interrupt Registers bit Masks
*
* 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 */
/*
* 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 */
/* SPI FIFO depth in bytes */
#define CDNS_SPI_FIFO_DEPTH 128
/* Default number of chip select lines */
#define CDNS_SPI_DEFAULT_NUM_CS 4
/**
* struct cdns_spi - This definition defines spi driver instance
* @regs: Virtual address of the SPI controller registers
* @ref_clk: Pointer to the peripheral clock
* @pclk: Pointer to the APB clock
* @speed_hz: Current SPI bus clock speed in Hz
* @txbuf: Pointer to the TX buffer
* @rxbuf: Pointer to the RX buffer
* @tx_bytes: Number of bytes left to transfer
* @rx_bytes: Number of bytes requested
* @dev_busy: Device busy flag
* @is_decoded_cs: Flag for decoder property set or not
*/
struct cdns_spi {
void __iomem *regs;
struct clk *ref_clk;
struct clk *pclk;
u32 speed_hz;
const u8 *txbuf;
u8 *rxbuf;
int tx_bytes;
int rx_bytes;
u8 dev_busy;
u32 is_decoded_cs;
};
/* Macros for the SPI controller read/write */
static inline u32 cdns_spi_read(struct cdns_spi *xspi, u32 offset)
{
return readl_relaxed(xspi->regs + offset);
}
static inline void cdns_spi_write(struct cdns_spi *xspi, u32 offset, u32 val)
{
writel_relaxed(val, xspi->regs + offset);
}
/**
* cdns_spi_init_hw - Initialize the hardware and configure the SPI controller
* @xspi: Pointer to the cdns_spi structure
*
* On reset the SPI controller is configured to be in master mode, baud rate
* divisor is set to 4, threshold value for TX FIFO not full interrupt is set
* to 1 and size of the word to be transferred as 8 bit.
* This function initializes the SPI controller to disable and clear all the
* interrupts, enable manual slave select and manual start, deselect all the
* chip select lines, and enable the SPI controller.
*/
static void cdns_spi_init_hw(struct cdns_spi *xspi)
{
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);
/* 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,
CDNS_SPI_CR_DEFAULT_MASK);
cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
CDNS_SPI_ER_ENABLE_MASK);
}
/**
* 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
*/
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);
if (is_high) {
/* Deselect the slave */
ctrl_reg |= CDNS_SPI_CR_SSCTRL_MASK;
} else {
/* Select the slave */
ctrl_reg &= ~CDNS_SPI_CR_SSCTRL_MASK;
if (!(xspi->is_decoded_cs))
ctrl_reg |= ((~(CDNS_SPI_SS0 << spi->chip_select)) <<
CDNS_SPI_SS_SHIFT) &
CDNS_SPI_CR_SSCTRL_MASK;
else
ctrl_reg |= (spi->chip_select << CDNS_SPI_SS_SHIFT) &
CDNS_SPI_CR_SSCTRL_MASK;
}
cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
}
/**
* cdns_spi_config_clock_mode - Sets clock polarity and phase
* @spi: Pointer to the spi_device structure
*
* Sets the requested clock polarity and phase.
*/
static void cdns_spi_config_clock_mode(struct spi_device *spi)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg;
ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
/* Set the SPI clock phase and clock polarity */
ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
if (spi->mode & SPI_CPHA)
ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
if (spi->mode & SPI_CPOL)
ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
}
/**
* cdns_spi_config_clock_freq - Sets clock frequency
* @spi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provides
* information about next transfer setup parameters
*
* Sets the requested clock frequency.
* Note: If the requested frequency is not an exact match with what can be
* obtained using the prescalar value the driver sets the clock frequency which
* is lower than the requested frequency (maximum lower) for the transfer. If
* the requested frequency is higher or lower than that is supported by the SPI
* controller the driver will set the highest or lowest frequency supported by
* controller.
*/
static void cdns_spi_config_clock_freq(struct spi_device *spi,
struct spi_transfer *transfer)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
u32 ctrl_reg, baud_rate_val;
unsigned long frequency;
frequency = clk_get_rate(xspi->ref_clk);
ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
/* Set the clock frequency */
if (xspi->speed_hz != transfer->speed_hz) {
/* first valid value is 1 */
baud_rate_val = CDNS_SPI_BAUD_DIV_MIN;
while ((baud_rate_val < CDNS_SPI_BAUD_DIV_MAX) &&
(frequency / (2 << baud_rate_val)) > transfer->speed_hz)
baud_rate_val++;
ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV_MASK;
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_setup_transfer - Configure SPI controller for specified transfer
* @spi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provides
* information about next transfer setup parameters
*
* Sets the operational mode of SPI controller for the next SPI transfer and
* sets the requested clock frequency.
*
* Return: Always 0
*/
static int cdns_spi_setup_transfer(struct spi_device *spi,
struct spi_transfer *transfer)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
cdns_spi_config_clock_freq(spi, transfer);
dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u clock speed\n",
__func__, spi->mode, spi->bits_per_word,
xspi->speed_hz);
return 0;
}
/**
* cdns_spi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible
* @xspi: Pointer to the cdns_spi structure
*/
static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi)
{
unsigned long trans_cnt = 0;
while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) &&
(xspi->tx_bytes > 0)) {
if (xspi->txbuf)
cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET,
*xspi->txbuf++);
else
cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET, 0);
xspi->tx_bytes--;
trans_cnt++;
}
}
/**
* cdns_spi_irq - Interrupt service routine of the SPI controller
* @irq: IRQ number
* @dev_id: Pointer to the xspi structure
*
* This function handles TX empty and Mode Fault interrupts only.
* On TX empty interrupt this function reads the received data from RX FIFO and
* fills the TX FIFO if there is any data remaining to be transferred.
* On Mode Fault interrupt this function indicates that transfer is completed,
* the SPI subsystem will identify the error as the remaining bytes to be
* transferred is non-zero.
*
* Return: IRQ_HANDLED when handled; IRQ_NONE otherwise.
*/
static irqreturn_t cdns_spi_irq(int irq, void *dev_id)
{
struct spi_master *master = dev_id;
struct cdns_spi *xspi = spi_master_get_devdata(master);
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);
if (intr_status & CDNS_SPI_IXR_MODF_MASK) {
/* 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);
spi_finalize_current_transfer(master);
status = IRQ_HANDLED;
} else if (intr_status & CDNS_SPI_IXR_TXOW_MASK) {
unsigned long trans_cnt;
trans_cnt = xspi->rx_bytes - xspi->tx_bytes;
/* Read out the data from the RX FIFO */
while (trans_cnt) {
u8 data;
data = cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
if (xspi->rxbuf)
*xspi->rxbuf++ = data;
xspi->rx_bytes--;
trans_cnt--;
}
if (xspi->tx_bytes) {
/* There is more data to send */
cdns_spi_fill_tx_fifo(xspi);
} else {
/* Transfer is completed */
cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
CDNS_SPI_IXR_DEFAULT_MASK);
spi_finalize_current_transfer(master);
}
status = IRQ_HANDLED;
}
return status;
}
/**
* cdns_transfer_one - Initiates the SPI transfer
* @master: Pointer to spi_master structure
* @spi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provides
* information about next transfer parameters
*
* This function fills the TX FIFO, starts the SPI transfer and
* returns a positive transfer count so that core will wait for completion.
*
* Return: Number of bytes transferred in the last transfer
*/
static int cdns_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *transfer)
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
xspi->txbuf = transfer->tx_buf;
xspi->rxbuf = transfer->rx_buf;
xspi->tx_bytes = transfer->len;
xspi->rx_bytes = transfer->len;
cdns_spi_setup_transfer(spi, transfer);
cdns_spi_fill_tx_fifo(xspi);
cdns_spi_write(xspi, CDNS_SPI_IER_OFFSET,
CDNS_SPI_IXR_DEFAULT_MASK);
return transfer->len;
}
/**
* cdns_prepare_transfer_hardware - Prepares hardware for transfer.
* @master: Pointer to the spi_master structure which provides
* information about the controller.
*
* This function enables SPI master controller.
*
* Return: 0 always
*/
static int cdns_prepare_transfer_hardware(struct spi_master *master)
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
cdns_spi_config_clock_mode(master->cur_msg->spi);
cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
CDNS_SPI_ER_ENABLE_MASK);
return 0;
}
/**
* cdns_unprepare_transfer_hardware - Relaxes hardware after transfer
* @master: Pointer to the spi_master structure which provides
* information about the controller.
*
* This function disables the SPI master controller.
*
* Return: 0 always
*/
static int cdns_unprepare_transfer_hardware(struct spi_master *master)
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
CDNS_SPI_ER_DISABLE_MASK);
return 0;
}
/**
* cdns_spi_probe - Probe method for the SPI driver
* @pdev: Pointer to the platform_device structure
*
* This function initializes the driver data structures and the hardware.
*
* Return: 0 on success and error value on error
*/
static int cdns_spi_probe(struct platform_device *pdev)
{
int ret = 0, irq;
struct spi_master *master;
struct cdns_spi *xspi;
struct resource *res;
u32 num_cs;
master = spi_alloc_master(&pdev->dev, sizeof(*xspi));
if (master == NULL)
return -ENOMEM;
xspi = spi_master_get_devdata(master);
master->dev.of_node = pdev->dev.of_node;
platform_set_drvdata(pdev, master);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
xspi->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(xspi->regs)) {
ret = PTR_ERR(xspi->regs);
goto remove_master;
}
xspi->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(xspi->pclk)) {
dev_err(&pdev->dev, "pclk clock not found.\n");
ret = PTR_ERR(xspi->pclk);
goto remove_master;
}
xspi->ref_clk = devm_clk_get(&pdev->dev, "ref_clk");
if (IS_ERR(xspi->ref_clk)) {
dev_err(&pdev->dev, "ref_clk clock not found.\n");
ret = PTR_ERR(xspi->ref_clk);
goto remove_master;
}
ret = clk_prepare_enable(xspi->pclk);
if (ret) {
dev_err(&pdev->dev, "Unable to enable APB clock.\n");
goto remove_master;
}
ret = clk_prepare_enable(xspi->ref_clk);
if (ret) {
dev_err(&pdev->dev, "Unable to enable device clock.\n");
goto clk_dis_apb;
}
/* SPI controller initializations */
cdns_spi_init_hw(xspi);
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
ret = -ENXIO;
dev_err(&pdev->dev, "irq number is invalid\n");
goto remove_master;
}
ret = devm_request_irq(&pdev->dev, irq, cdns_spi_irq,
0, pdev->name, master);
if (ret != 0) {
ret = -ENXIO;
dev_err(&pdev->dev, "request_irq failed\n");
goto remove_master;
}
ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
if (ret < 0)
master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
else
master->num_chipselect = num_cs;
ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs",
&xspi->is_decoded_cs);
if (ret < 0)
xspi->is_decoded_cs = 0;
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->mode_bits = SPI_CPOL | SPI_CPHA;
/* Set to default valid value */
master->max_speed_hz = clk_get_rate(xspi->ref_clk) / 4;
xspi->speed_hz = master->max_speed_hz;
master->bits_per_word_mask = SPI_BPW_MASK(8);
ret = spi_register_master(master);
if (ret) {
dev_err(&pdev->dev, "spi_register_master failed\n");
goto clk_dis_all;
}
return ret;
clk_dis_all:
clk_disable_unprepare(xspi->ref_clk);
clk_dis_apb:
clk_disable_unprepare(xspi->pclk);
remove_master:
spi_master_put(master);
return ret;
}
/**
* cdns_spi_remove - Remove method for the SPI driver
* @pdev: Pointer to the platform_device structure
*
* This function is called if a device is physically removed from the system or
* if the driver module is being unloaded. It frees all resources allocated to
* the device.
*
* Return: 0 on success and error value on error
*/
static int cdns_spi_remove(struct platform_device *pdev)
{
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);
clk_disable_unprepare(xspi->ref_clk);
clk_disable_unprepare(xspi->pclk);
spi_unregister_master(master);
return 0;
}
/**
* cdns_spi_suspend - Suspend method for the SPI driver
* @dev: Address of the platform_device structure
*
* This function disables the SPI controller and
* changes the driver state to "suspend"
*
* Return: Always 0
*/
static int __maybe_unused cdns_spi_suspend(struct device *dev)
{
struct platform_device *pdev = container_of(dev,
struct 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;
}
/**
* cdns_spi_resume - Resume method for the SPI driver
* @dev: Address of the platform_device structure
*
* This function changes the driver state to "ready"
*
* Return: 0 on success and error value on error
*/
static int __maybe_unused cdns_spi_resume(struct device *dev)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct spi_master *master = platform_get_drvdata(pdev);
struct cdns_spi *xspi = spi_master_get_devdata(master);
int ret = 0;
ret = clk_prepare_enable(xspi->pclk);
if (ret) {
dev_err(dev, "Cannot enable APB clock.\n");
return ret;
}
ret = clk_prepare_enable(xspi->ref_clk);
if (ret) {
dev_err(dev, "Cannot enable device clock.\n");
clk_disable(xspi->pclk);
return ret;
}
spi_master_resume(master);
return 0;
}
static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
cdns_spi_resume);
static struct of_device_id cdns_spi_of_match[] = {
{ .compatible = "xlnx,zynq-spi-r1p6" },
{ .compatible = "cdns,spi-r1p6" },
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, cdns_spi_of_match);
/* cdns_spi_driver - This structure defines the SPI subsystem platform driver */
static struct platform_driver cdns_spi_driver = {
.probe = cdns_spi_probe,
.remove = cdns_spi_remove,
.driver = {
.name = CDNS_SPI_NAME,
.owner = THIS_MODULE,
.of_match_table = cdns_spi_of_match,
.pm = &cdns_spi_dev_pm_ops,
},
};
module_platform_driver(cdns_spi_driver);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Cadence SPI driver");
MODULE_LICENSE("GPL");
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