spi: altera: separate core code from platform code

In preparation of adding support for a new bus type,
separate the core spi-altera code from the platform
driver code.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Link: https://lore.kernel.org/r/20210416165720.554144-2-matthew.gerlach@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 0 insertions, 378 deletions

diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c
deleted file mode 100644
index 62ea0c9e321b..000000000000
--- a/drivers/spi/spi-altera.c
+++ /dev/null
@@ -1,378 +0,0 @@
-// 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);