drivers/spi/spi-altera.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Altera SPI driver
  *
  * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
  *
  * Based on spi_s3c24xx.c, which is:
  * Copyright (c) 2006 Ben Dooks
  * Copyright (c) 2006 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  */

 #include <linux/interrupt.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/spi/altera.h>
 #include <linux/spi/spi.h>
 #include <linux/io.h>
 #include <linux/of.h>

 #define DRV_NAME "spi_altera"

 #define ALTERA_SPI_RXDATA	0
 #define ALTERA_SPI_TXDATA	4
 #define ALTERA_SPI_STATUS	8
 #define ALTERA_SPI_CONTROL	12
 #define ALTERA_SPI_SLAVE_SEL	20

 #define ALTERA_SPI_STATUS_ROE_MSK	0x8
 #define ALTERA_SPI_STATUS_TOE_MSK	0x10
 #define ALTERA_SPI_STATUS_TMT_MSK	0x20
 #define ALTERA_SPI_STATUS_TRDY_MSK	0x40
 #define ALTERA_SPI_STATUS_RRDY_MSK	0x80
 #define ALTERA_SPI_STATUS_E_MSK		0x100

 #define ALTERA_SPI_CONTROL_IROE_MSK	0x8
 #define ALTERA_SPI_CONTROL_ITOE_MSK	0x10
 #define ALTERA_SPI_CONTROL_ITRDY_MSK	0x40
 #define ALTERA_SPI_CONTROL_IRRDY_MSK	0x80
 #define ALTERA_SPI_CONTROL_IE_MSK	0x100
 #define ALTERA_SPI_CONTROL_SSO_MSK	0x400

 #define ALTERA_SPI_MAX_CS		32

 enum altera_spi_type {
 	ALTERA_SPI_TYPE_UNKNOWN,
 	ALTERA_SPI_TYPE_SUBDEV,
 };

 struct altera_spi {
 	int irq;
 	int len;
 	int count;
 	int bytes_per_word;
 	u32 imr;

 	/* data buffers */
 	const unsigned char *tx;
 	unsigned char *rx;

 	struct regmap *regmap;
 	u32 regoff;
 	struct device *dev;
 };

 static const struct regmap_config spi_altera_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 	.fast_io = true,
 };

 static int altr_spi_writel(struct altera_spi *hw, unsigned int reg,
 			   unsigned int val)
 {
 	int ret;

 	ret = regmap_write(hw->regmap, hw->regoff + reg, val);
 	if (ret)
 		dev_err(hw->dev, "fail to write reg 0x%x val 0x%x: %d\n",
 			reg, val, ret);

 	return ret;
 }

 static int altr_spi_readl(struct altera_spi *hw, unsigned int reg,
 			  unsigned int *val)
 {
 	int ret;

 	ret = regmap_read(hw->regmap, hw->regoff + reg, val);
 	if (ret)
 		dev_err(hw->dev, "fail to read reg 0x%x: %d\n", reg, ret);

 	return ret;
 }

 static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev)
 {
 	return spi_master_get_devdata(sdev->master);
 }

 static void altera_spi_set_cs(struct spi_device *spi, bool is_high)
 {
 	struct altera_spi *hw = altera_spi_to_hw(spi);

 	if (is_high) {
 		hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK;
 		altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
 		altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, 0);
 	} else {
 		altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL,
 				BIT(spi->chip_select));
 		hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK;
 		altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
 	}
 }

 static void altera_spi_tx_word(struct altera_spi *hw)
 {
 	unsigned int txd = 0;

 	if (hw->tx) {
 		switch (hw->bytes_per_word) {
 		case 1:
 			txd = hw->tx[hw->count];
 			break;
 		case 2:
 			txd = (hw->tx[hw->count * 2]
 				| (hw->tx[hw->count * 2 + 1] << 8));
 			break;
 		case 4:
 			txd = (hw->tx[hw->count * 4]
 				| (hw->tx[hw->count * 4 + 1] << 8)
 				| (hw->tx[hw->count * 4 + 2] << 16)
 				| (hw->tx[hw->count * 4 + 3] << 24));
 			break;

 		}
 	}

 	altr_spi_writel(hw, ALTERA_SPI_TXDATA, txd);
 }

 static void altera_spi_rx_word(struct altera_spi *hw)
 {
 	unsigned int rxd;

 	altr_spi_readl(hw, ALTERA_SPI_RXDATA, &rxd);
 	if (hw->rx) {
 		switch (hw->bytes_per_word) {
 		case 1:
 			hw->rx[hw->count] = rxd;
 			break;
 		case 2:
 			hw->rx[hw->count * 2] = rxd;
 			hw->rx[hw->count * 2 + 1] = rxd >> 8;
 			break;
 		case 4:
 			hw->rx[hw->count * 4] = rxd;
 			hw->rx[hw->count * 4 + 1] = rxd >> 8;
 			hw->rx[hw->count * 4 + 2] = rxd >> 16;
 			hw->rx[hw->count * 4 + 3] = rxd >> 24;
 			break;

 		}
 	}

 	hw->count++;
 }

 static int altera_spi_txrx(struct spi_master *master,
 	struct spi_device *spi, struct spi_transfer *t)
 {
 	struct altera_spi *hw = spi_master_get_devdata(master);
 	u32 val;

 	hw->tx = t->tx_buf;
 	hw->rx = t->rx_buf;
 	hw->count = 0;
 	hw->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8);
 	hw->len = t->len / hw->bytes_per_word;

 	if (hw->irq >= 0) {
 		/* enable receive interrupt */
 		hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK;
 		altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);

 		/* send the first byte */
 		altera_spi_tx_word(hw);

 		return 1;
 	}

 	while (hw->count < hw->len) {
 		altera_spi_tx_word(hw);

 		for (;;) {
 			altr_spi_readl(hw, ALTERA_SPI_STATUS, &val);
 			if (val & ALTERA_SPI_STATUS_RRDY_MSK)
 				break;

 			cpu_relax();
 		}

 		altera_spi_rx_word(hw);
 	}
 	spi_finalize_current_transfer(master);

 	return 0;
 }

 static irqreturn_t altera_spi_irq(int irq, void *dev)
 {
 	struct spi_master *master = dev;
 	struct altera_spi *hw = spi_master_get_devdata(master);

 	altera_spi_rx_word(hw);

 	if (hw->count < hw->len) {
 		altera_spi_tx_word(hw);
 	} else {
 		/* disable receive interrupt */
 		hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK;
 		altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);

 		spi_finalize_current_transfer(master);
 	}

 	return IRQ_HANDLED;
 }

 static int altera_spi_probe(struct platform_device *pdev)
 {
 	const struct platform_device_id *platid = platform_get_device_id(pdev);
 	struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
 	enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN;
 	struct altera_spi *hw;
 	struct spi_master *master;
 	int err = -ENODEV;
 	u32 val;
 	u16 i;

 	master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi));
 	if (!master)
 		return err;

 	/* setup the master state. */
 	master->bus_num = pdev->id;

 	if (pdata) {
 		if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
 			dev_err(&pdev->dev,
 				"Invalid number of chipselect: %hu\n",
 				pdata->num_chipselect);
 			err = -EINVAL;
 			goto exit;
 		}

 		master->num_chipselect = pdata->num_chipselect;
 		master->mode_bits = pdata->mode_bits;
 		master->bits_per_word_mask = pdata->bits_per_word_mask;
 	} else {
 		master->num_chipselect = 16;
 		master->mode_bits = SPI_CS_HIGH;
 		master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
 	}

 	master->dev.of_node = pdev->dev.of_node;
 	master->transfer_one = altera_spi_txrx;
 	master->set_cs = altera_spi_set_cs;

 	hw = spi_master_get_devdata(master);
 	hw->dev = &pdev->dev;

 	if (platid)
 		type = platid->driver_data;

 	/* find and map our resources */
 	if (type == ALTERA_SPI_TYPE_SUBDEV) {
 		struct resource *regoff;

 		hw->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 		if (!hw->regmap) {
 			dev_err(&pdev->dev, "get regmap failed\n");
 			goto exit;
 		}

 		regoff = platform_get_resource(pdev, IORESOURCE_REG, 0);
 		if (regoff)
 			hw->regoff = regoff->start;
 	} else {
 		void __iomem *res;

 		res = devm_platform_ioremap_resource(pdev, 0);
 		if (IS_ERR(res)) {
 			err = PTR_ERR(res);
 			goto exit;
 		}

 		hw->regmap = devm_regmap_init_mmio(&pdev->dev, res,
 						   &spi_altera_config);
 		if (IS_ERR(hw->regmap)) {
 			dev_err(&pdev->dev, "regmap mmio init failed\n");
 			err = PTR_ERR(hw->regmap);
 			goto exit;
 		}
 	}

 	/* program defaults into the registers */
 	hw->imr = 0;		/* disable spi interrupts */
 	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
 	altr_spi_writel(hw, ALTERA_SPI_STATUS, 0);	/* clear status reg */
 	altr_spi_readl(hw, ALTERA_SPI_STATUS, &val);
 	if (val & ALTERA_SPI_STATUS_RRDY_MSK)
 		altr_spi_readl(hw, ALTERA_SPI_RXDATA, &val); /* flush rxdata */
 	/* irq is optional */
 	hw->irq = platform_get_irq(pdev, 0);
 	if (hw->irq >= 0) {
 		err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
 				       pdev->name, master);
 		if (err)
 			goto exit;
 	}

 	err = devm_spi_register_master(&pdev->dev, master);
 	if (err)
 		goto exit;

 	if (pdata) {
 		for (i = 0; i < pdata->num_devices; i++) {
 			if (!spi_new_device(master, pdata->devices + i))
 				dev_warn(&pdev->dev,
 					 "unable to create SPI device: %s\n",
 					 pdata->devices[i].modalias);
 		}
 	}

 	dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq);

 	return 0;
 exit:
 	spi_master_put(master);
 	return err;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id altera_spi_match[] = {
 	{ .compatible = "ALTR,spi-1.0", },
 	{ .compatible = "altr,spi-1.0", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, altera_spi_match);
 #endif /* CONFIG_OF */

 static const struct platform_device_id altera_spi_ids[] = {
 	{ DRV_NAME,		ALTERA_SPI_TYPE_UNKNOWN },
 	{ "subdev_spi_altera",	ALTERA_SPI_TYPE_SUBDEV },
 	{ }
 };
 MODULE_DEVICE_TABLE(platform, altera_spi_ids);

 static struct platform_driver altera_spi_driver = {
 	.probe = altera_spi_probe,
 	.driver = {
 		.name = DRV_NAME,
 		.pm = NULL,
 		.of_match_table = of_match_ptr(altera_spi_match),
 	},
 	.id_table	= altera_spi_ids,
 };
 module_platform_driver(altera_spi_driver);

 MODULE_DESCRIPTION("Altera SPI driver");
 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DRV_NAME);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Altera SPI driver
	*
	* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
	*
	* Based on spi_s3c24xx.c, which is:
	* Copyright (c) 2006 Ben Dooks
	* Copyright (c) 2006 Simtec Electronics
	* Ben Dooks <ben@simtec.co.uk>
	*/

	#include <linux/interrupt.h>
	#include <linux/errno.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/spi/altera.h>
	#include <linux/spi/spi.h>
	#include <linux/io.h>
	#include <linux/of.h>

	#define DRV_NAME "spi_altera"

	#define ALTERA_SPI_RXDATA 0
	#define ALTERA_SPI_TXDATA 4
	#define ALTERA_SPI_STATUS 8
	#define ALTERA_SPI_CONTROL 12
	#define ALTERA_SPI_SLAVE_SEL 20

	#define ALTERA_SPI_STATUS_ROE_MSK 0x8
	#define ALTERA_SPI_STATUS_TOE_MSK 0x10
	#define ALTERA_SPI_STATUS_TMT_MSK 0x20
	#define ALTERA_SPI_STATUS_TRDY_MSK 0x40
	#define ALTERA_SPI_STATUS_RRDY_MSK 0x80
	#define ALTERA_SPI_STATUS_E_MSK 0x100

	#define ALTERA_SPI_CONTROL_IROE_MSK 0x8
	#define ALTERA_SPI_CONTROL_ITOE_MSK 0x10
	#define ALTERA_SPI_CONTROL_ITRDY_MSK 0x40
	#define ALTERA_SPI_CONTROL_IRRDY_MSK 0x80
	#define ALTERA_SPI_CONTROL_IE_MSK 0x100
	#define ALTERA_SPI_CONTROL_SSO_MSK 0x400

	#define ALTERA_SPI_MAX_CS 32

	enum altera_spi_type {
	ALTERA_SPI_TYPE_UNKNOWN,
	ALTERA_SPI_TYPE_SUBDEV,
	};

	struct altera_spi {
	int irq;
	int len;
	int count;
	int bytes_per_word;
	u32 imr;

	/* data buffers */
	const unsigned char *tx;
	unsigned char *rx;

	struct regmap *regmap;
	u32 regoff;
	struct device *dev;
	};

	static const struct regmap_config spi_altera_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.fast_io = true,
	};

	static int altr_spi_writel(struct altera_spi *hw, unsigned int reg,
	unsigned int val)
	{
	int ret;

	ret = regmap_write(hw->regmap, hw->regoff + reg, val);
	if (ret)
	dev_err(hw->dev, "fail to write reg 0x%x val 0x%x: %d\n",
	reg, val, ret);

	return ret;
	}

	static int altr_spi_readl(struct altera_spi *hw, unsigned int reg,
	unsigned int *val)
	{
	int ret;

	ret = regmap_read(hw->regmap, hw->regoff + reg, val);
	if (ret)
	dev_err(hw->dev, "fail to read reg 0x%x: %d\n", reg, ret);

	return ret;
	}

	static inline struct altera_spi altera_spi_to_hw(struct spi_device sdev)
	{
	return spi_master_get_devdata(sdev->master);
	}

	static void altera_spi_set_cs(struct spi_device *spi, bool is_high)
	{
	struct altera_spi *hw = altera_spi_to_hw(spi);

	if (is_high) {
	hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK;
	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
	altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, 0);
	} else {
	altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL,
	BIT(spi->chip_select));
	hw->imr \|= ALTERA_SPI_CONTROL_SSO_MSK;
	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
	}
	}

	static void altera_spi_tx_word(struct altera_spi *hw)
	{
	unsigned int txd = 0;

	if (hw->tx) {
	switch (hw->bytes_per_word) {
	case 1:
	txd = hw->tx[hw->count];
	break;
	case 2:
	txd = (hw->tx[hw->count * 2]
	\| (hw->tx[hw->count * 2 + 1] << 8));
	break;
	case 4:
	txd = (hw->tx[hw->count * 4]
	\| (hw->tx[hw->count * 4 + 1] << 8)
	\| (hw->tx[hw->count * 4 + 2] << 16)
	\| (hw->tx[hw->count * 4 + 3] << 24));
	break;

	}
	}

	altr_spi_writel(hw, ALTERA_SPI_TXDATA, txd);
	}

	static void altera_spi_rx_word(struct altera_spi *hw)
	{
	unsigned int rxd;

	altr_spi_readl(hw, ALTERA_SPI_RXDATA, &rxd);
	if (hw->rx) {
	switch (hw->bytes_per_word) {
	case 1:
	hw->rx[hw->count] = rxd;
	break;
	case 2:
	hw->rx[hw->count * 2] = rxd;
	hw->rx[hw->count * 2 + 1] = rxd >> 8;
	break;
	case 4:
	hw->rx[hw->count * 4] = rxd;
	hw->rx[hw->count * 4 + 1] = rxd >> 8;
	hw->rx[hw->count * 4 + 2] = rxd >> 16;
	hw->rx[hw->count * 4 + 3] = rxd >> 24;
	break;

	}
	}

	hw->count++;
	}

	static int altera_spi_txrx(struct spi_master *master,
	struct spi_device spi, struct spi_transfer t)
	{
	struct altera_spi *hw = spi_master_get_devdata(master);
	u32 val;

	hw->tx = t->tx_buf;
	hw->rx = t->rx_buf;
	hw->count = 0;
	hw->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8);
	hw->len = t->len / hw->bytes_per_word;

	if (hw->irq >= 0) {
	/* enable receive interrupt */
	hw->imr \|= ALTERA_SPI_CONTROL_IRRDY_MSK;
	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);

	/* send the first byte */
	altera_spi_tx_word(hw);

	return 1;
	}

	while (hw->count < hw->len) {
	altera_spi_tx_word(hw);

	for (;;) {
	altr_spi_readl(hw, ALTERA_SPI_STATUS, &val);
	if (val & ALTERA_SPI_STATUS_RRDY_MSK)
	break;

	cpu_relax();
	}

	altera_spi_rx_word(hw);
	}
	spi_finalize_current_transfer(master);

	return 0;
	}

	static irqreturn_t altera_spi_irq(int irq, void *dev)
	{
	struct spi_master *master = dev;
	struct altera_spi *hw = spi_master_get_devdata(master);

	altera_spi_rx_word(hw);

	if (hw->count < hw->len) {
	altera_spi_tx_word(hw);
	} else {
	/* disable receive interrupt */
	hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK;
	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);

	spi_finalize_current_transfer(master);
	}

	return IRQ_HANDLED;
	}

	static int altera_spi_probe(struct platform_device *pdev)
	{
	const struct platform_device_id *platid = platform_get_device_id(pdev);
	struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
	enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN;
	struct altera_spi *hw;
	struct spi_master *master;
	int err = -ENODEV;
	u32 val;
	u16 i;

	master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi));
	if (!master)
	return err;

	/* setup the master state. */
	master->bus_num = pdev->id;

	if (pdata) {
	if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
	dev_err(&pdev->dev,
	"Invalid number of chipselect: %hu\n",
	pdata->num_chipselect);
	err = -EINVAL;
	goto exit;
	}

	master->num_chipselect = pdata->num_chipselect;
	master->mode_bits = pdata->mode_bits;
	master->bits_per_word_mask = pdata->bits_per_word_mask;
	} else {
	master->num_chipselect = 16;
	master->mode_bits = SPI_CS_HIGH;
	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
	}

	master->dev.of_node = pdev->dev.of_node;
	master->transfer_one = altera_spi_txrx;
	master->set_cs = altera_spi_set_cs;

	hw = spi_master_get_devdata(master);
	hw->dev = &pdev->dev;

	if (platid)
	type = platid->driver_data;

	/* find and map our resources */
	if (type == ALTERA_SPI_TYPE_SUBDEV) {
	struct resource *regoff;

	hw->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!hw->regmap) {
	dev_err(&pdev->dev, "get regmap failed\n");
	goto exit;
	}

	regoff = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (regoff)
	hw->regoff = regoff->start;
	} else {
	void __iomem *res;

	res = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(res)) {
	err = PTR_ERR(res);
	goto exit;
	}

	hw->regmap = devm_regmap_init_mmio(&pdev->dev, res,
	&spi_altera_config);
	if (IS_ERR(hw->regmap)) {
	dev_err(&pdev->dev, "regmap mmio init failed\n");
	err = PTR_ERR(hw->regmap);
	goto exit;
	}
	}

	/* program defaults into the registers */
	hw->imr = 0; /* disable spi interrupts */
	altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr);
	altr_spi_writel(hw, ALTERA_SPI_STATUS, 0); /* clear status reg */
	altr_spi_readl(hw, ALTERA_SPI_STATUS, &val);
	if (val & ALTERA_SPI_STATUS_RRDY_MSK)
	altr_spi_readl(hw, ALTERA_SPI_RXDATA, &val); /* flush rxdata */
	/* irq is optional */
	hw->irq = platform_get_irq(pdev, 0);
	if (hw->irq >= 0) {
	err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
	pdev->name, master);
	if (err)
	goto exit;
	}

	err = devm_spi_register_master(&pdev->dev, master);
	if (err)
	goto exit;

	if (pdata) {
	for (i = 0; i < pdata->num_devices; i++) {
	if (!spi_new_device(master, pdata->devices + i))
	dev_warn(&pdev->dev,
	"unable to create SPI device: %s\n",
	pdata->devices[i].modalias);
	}
	}

	dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq);

	return 0;
	exit:
	spi_master_put(master);
	return err;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id altera_spi_match[] = {
	{ .compatible = "ALTR,spi-1.0", },
	{ .compatible = "altr,spi-1.0", },
	{},
	};
	MODULE_DEVICE_TABLE(of, altera_spi_match);
	#endif /* CONFIG_OF */

	static const struct platform_device_id altera_spi_ids[] = {
	{ DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN },
	{ "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV },
	{ }
	};
	MODULE_DEVICE_TABLE(platform, altera_spi_ids);

	static struct platform_driver altera_spi_driver = {
	.probe = altera_spi_probe,
	.driver = {
	.name = DRV_NAME,
	.pm = NULL,
	.of_match_table = of_match_ptr(altera_spi_match),
	},
	.id_table = altera_spi_ids,
	};
	module_platform_driver(altera_spi_driver);

	MODULE_DESCRIPTION("Altera SPI driver");
	MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:" DRV_NAME);