1 files changed, 0 insertions, 430 deletions
diff --git a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
deleted file mode 100644
index 2d95e80495..0000000000
--- a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
+++ /dev/null
@@ -1,430 +0,0 @@
-/*
- * SPI controller driver for the Mikrotik RB4xx boards
- *
- * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
- *
- * This file was based on the patches for Linux 2.6.27.39 published by
- * MikroTik for their RouterBoard 4xx series devices.
- *
- * 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.
- *
- */
-
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/platform_device.h>
-#include <linux/spi/spi.h>
-
-#include <asm/mach-ath79/ar71xx_regs.h>
-#include <asm/mach-ath79/ath79.h>
-
-#define DRV_NAME	"rb4xx-spi"
-#define DRV_DESC	"Mikrotik RB4xx SPI controller driver"
-#define DRV_VERSION	"0.1.0"
-
-#define SPI_CTRL_FASTEST	0x40
-#define SPI_FLASH_HZ		33333334
-#define SPI_CPLD_HZ		33333334
-
-#define CPLD_CMD_READ_FAST	0x0b
-
-#undef RB4XX_SPI_DEBUG
-
-struct rb4xx_spi {
-	void __iomem		*base;
-	struct spi_master	*master;
-
-	unsigned		spi_ctrl_flash;
-	unsigned		spi_ctrl_fread;
-
-	struct clk		*ahb_clk;
-	unsigned long		ahb_freq;
-
-	spinlock_t		lock;
-	struct list_head	queue;
-	int			busy:1;
-	int			cs_wait;
-};
-
-static unsigned spi_clk_low = AR71XX_SPI_IOC_CS1;
-
-#ifdef RB4XX_SPI_DEBUG
-static inline void do_spi_delay(void)
-{
-	ndelay(20000);
-}
-#else
-static inline void do_spi_delay(void) { }
-#endif
-
-static inline void do_spi_init(struct spi_device *spi)
-{
-	unsigned cs = AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1;
-
-	if (!(spi->mode & SPI_CS_HIGH))
-		cs ^= (spi->chip_select == 2) ? AR71XX_SPI_IOC_CS1 :
-						AR71XX_SPI_IOC_CS0;
-
-	spi_clk_low = cs;
-}
-
-static inline void do_spi_finish(void __iomem *base)
-{
-	do_spi_delay();
-	__raw_writel(AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1,
-		     base + AR71XX_SPI_REG_IOC);
-}
-
-static inline void do_spi_clk(void __iomem *base, int bit)
-{
-	unsigned bval = spi_clk_low | ((bit & 1) ? AR71XX_SPI_IOC_DO : 0);
-
-	do_spi_delay();
-	__raw_writel(bval, base + AR71XX_SPI_REG_IOC);
-	do_spi_delay();
-	__raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
-}
-
-static void do_spi_byte(void __iomem *base, unsigned char byte)
-{
-	do_spi_clk(base, byte >> 7);
-	do_spi_clk(base, byte >> 6);
-	do_spi_clk(base, byte >> 5);
-	do_spi_clk(base, byte >> 4);
-	do_spi_clk(base, byte >> 3);
-	do_spi_clk(base, byte >> 2);
-	do_spi_clk(base, byte >> 1);
-	do_spi_clk(base, byte);
-
-	pr_debug("spi_byte sent 0x%02x got 0x%02x\n",
-	       (unsigned)byte,
-	       (unsigned char)__raw_readl(base + AR71XX_SPI_REG_RDS));
-}
-
-static inline void do_spi_clk_fast(void __iomem *base, unsigned bit1,
-				   unsigned bit2)
-{
-	unsigned bval = (spi_clk_low |
-			 ((bit1 & 1) ? AR71XX_SPI_IOC_DO : 0) |
-			 ((bit2 & 1) ? AR71XX_SPI_IOC_CS2 : 0));
-	do_spi_delay();
-	__raw_writel(bval, base + AR71XX_SPI_REG_IOC);
-	do_spi_delay();
-	__raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
-}
-
-static void do_spi_byte_fast(void __iomem *base, unsigned char byte)
-{
-	do_spi_clk_fast(base, byte >> 7, byte >> 6);
-	do_spi_clk_fast(base, byte >> 5, byte >> 4);
-	do_spi_clk_fast(base, byte >> 3, byte >> 2);
-	do_spi_clk_fast(base, byte >> 1, byte >> 0);
-
-	pr_debug("spi_byte_fast sent 0x%02x got 0x%02x\n",
-	       (unsigned)byte,
-	       (unsigned char) __raw_readl(base + AR71XX_SPI_REG_RDS));
-}
-
-static int rb4xx_spi_txrx(void __iomem *base, struct spi_transfer *t)
-{
-	const unsigned char *tx_ptr = t->tx_buf;
-	unsigned char *rx_ptr = t->rx_buf;
-	unsigned i;
-
-	pr_debug("spi_txrx len %u tx %u rx %u\n",
-	       t->len,
-	       (t->tx_buf ? 1 : 0),
-	       (t->rx_buf ? 1 : 0));
-
-	for (i = 0; i < t->len; ++i) {
-		unsigned char sdata = tx_ptr ? tx_ptr[i] : 0;
-
-		if (t->tx_nbits == SPI_NBITS_DUAL)
-			do_spi_byte_fast(base, sdata);
-		else
-			do_spi_byte(base, sdata);
-
-		if (rx_ptr)
-			rx_ptr[i] = __raw_readl(base + AR71XX_SPI_REG_RDS) & 0xff;
-	}
-
-	return i;
-}
-
-static int rb4xx_spi_msg(struct rb4xx_spi *rbspi, struct spi_message *m)
-{
-	struct spi_transfer *t = NULL;
-	void __iomem *base = rbspi->base;
-
-	m->status = 0;
-	if (list_empty(&m->transfers))
-		return -1;
-
-	__raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
-	__raw_writel(SPI_CTRL_FASTEST, base + AR71XX_SPI_REG_CTRL);
-	do_spi_init(m->spi);
-
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		int len;
-
-		len = rb4xx_spi_txrx(base, t);
-		if (len != t->len) {
-			m->status = -EMSGSIZE;
-			break;
-		}
-		m->actual_length += len;
-
-		if (t->cs_change) {
-			if (list_is_last(&t->transfer_list, &m->transfers)) {
-				/* wait for continuation */
-				return m->spi->chip_select;
-			}
-			do_spi_finish(base);
-			ndelay(100);
-		}
-	}
-
-	do_spi_finish(base);
-	__raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL);
-	__raw_writel(0, base + AR71XX_SPI_REG_FS);
-	return -1;
-}
-
-static void rb4xx_spi_process_queue_locked(struct rb4xx_spi *rbspi,
-					   unsigned long *flags)
-{
-	int cs = rbspi->cs_wait;
-
-	rbspi->busy = 1;
-	while (!list_empty(&rbspi->queue)) {
-		struct spi_message *m;
-
-		list_for_each_entry(m, &rbspi->queue, queue)
-			if (cs < 0 || cs == m->spi->chip_select)
-				break;
-
-		if (&m->queue == &rbspi->queue)
-			break;
-
-		list_del_init(&m->queue);
-		spin_unlock_irqrestore(&rbspi->lock, *flags);
-
-		cs = rb4xx_spi_msg(rbspi, m);
-		m->complete(m->context);
-
-		spin_lock_irqsave(&rbspi->lock, *flags);
-	}
-
-	rbspi->cs_wait = cs;
-	rbspi->busy = 0;
-
-	if (cs >= 0) {
-		/* TODO: add timer to unlock cs after 1s inactivity */
-	}
-}
-
-static int rb4xx_spi_transfer(struct spi_device *spi,
-			      struct spi_message *m)
-{
-	struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master);
-	unsigned long flags;
-
-	m->actual_length = 0;
-	m->status = -EINPROGRESS;
-
-	spin_lock_irqsave(&rbspi->lock, flags);
-	list_add_tail(&m->queue, &rbspi->queue);
-	if (rbspi->busy ||
-	    (rbspi->cs_wait >= 0 && rbspi->cs_wait != m->spi->chip_select)) {
-		/* job will be done later */
-		spin_unlock_irqrestore(&rbspi->lock, flags);
-		return 0;
-	}
-
-	/* process job in current context */
-	rb4xx_spi_process_queue_locked(rbspi, &flags);
-	spin_unlock_irqrestore(&rbspi->lock, flags);
-
-	return 0;
-}
-
-static int rb4xx_spi_setup(struct spi_device *spi)
-{
-	struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master);
-	unsigned long flags;
-
-	if (spi->mode & ~(SPI_CS_HIGH | SPI_TX_DUAL)) {
-		dev_err(&spi->dev, "mode %x not supported\n",
-			(unsigned) spi->mode);
-		return -EINVAL;
-	}
-
-	if (spi->bits_per_word != 8 && spi->bits_per_word != 0) {
-		dev_err(&spi->dev, "bits_per_word %u not supported\n",
-			(unsigned) spi->bits_per_word);
-		return -EINVAL;
-	}
-
-	spin_lock_irqsave(&rbspi->lock, flags);
-	if (rbspi->cs_wait == spi->chip_select && !rbspi->busy) {
-		rbspi->cs_wait = -1;
-		rb4xx_spi_process_queue_locked(rbspi, &flags);
-	}
-	spin_unlock_irqrestore(&rbspi->lock, flags);
-
-	return 0;
-}
-
-static unsigned get_spi_ctrl(struct rb4xx_spi *rbspi, unsigned hz_max,
-			     const char *name)
-{
-	unsigned div;
-
-	div = (rbspi->ahb_freq - 1) / (2 * hz_max);
-
-	/*
-	 * CPU has a bug at (div == 0) - first bit read is random
-	 */
-	if (div == 0)
-		++div;
-
-	if (name) {
-		unsigned ahb_khz = (rbspi->ahb_freq + 500) / 1000;
-		unsigned div_real = 2 * (div + 1);
-		pr_debug("rb4xx: %s SPI clock %u kHz (AHB %u kHz / %u)\n",
-		       name,
-		       ahb_khz / div_real,
-		       ahb_khz, div_real);
-	}
-
-	return SPI_CTRL_FASTEST + div;
-}
-
-static int rb4xx_spi_probe(struct platform_device *pdev)
-{
-	struct spi_master *master;
-	struct rb4xx_spi *rbspi;
-	struct resource *r;
-	int err = 0;
-
-	master = spi_alloc_master(&pdev->dev, sizeof(*rbspi));
-	if (master == NULL) {
-		dev_err(&pdev->dev, "no memory for spi_master\n");
-		err = -ENOMEM;
-		goto err_out;
-	}
-
-	master->bus_num = 0;
-	master->num_chipselect = 3;
-	master->mode_bits = SPI_TX_DUAL;
-	master->setup = rb4xx_spi_setup;
-	master->transfer = rb4xx_spi_transfer;
-
-	rbspi = spi_master_get_devdata(master);
-
-	rbspi->ahb_clk = clk_get(&pdev->dev, "ahb");
-	if (IS_ERR(rbspi->ahb_clk)) {
-		err = PTR_ERR(rbspi->ahb_clk);
-		goto err_put_master;
-	}
-
-	err = clk_prepare_enable(rbspi->ahb_clk);
-	if (err)
-		goto err_clk_put;
-
-	rbspi->ahb_freq = clk_get_rate(rbspi->ahb_clk);
-	if (!rbspi->ahb_freq) {
-		err = -EINVAL;
-		goto err_clk_disable;
-	}
-
-	platform_set_drvdata(pdev, rbspi);
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		err = -ENOENT;
-		goto err_clk_disable;
-	}
-
-	rbspi->base = ioremap(r->start, r->end - r->start + 1);
-	if (!rbspi->base) {
-		err = -ENXIO;
-		goto err_clk_disable;
-	}
-
-	rbspi->master = master;
-	rbspi->spi_ctrl_flash = get_spi_ctrl(rbspi, SPI_FLASH_HZ, "FLASH");
-	rbspi->spi_ctrl_fread = get_spi_ctrl(rbspi, SPI_CPLD_HZ, "CPLD");
-	rbspi->cs_wait = -1;
-
-	spin_lock_init(&rbspi->lock);
-	INIT_LIST_HEAD(&rbspi->queue);
-
-	err = spi_register_master(master);
-	if (err) {
-		dev_err(&pdev->dev, "failed to register SPI master\n");
-		goto err_iounmap;
-	}
-
-	return 0;
-
-err_iounmap:
-	iounmap(rbspi->base);
-err_clk_disable:
-	clk_disable_unprepare(rbspi->ahb_clk);
-err_clk_put:
-	clk_put(rbspi->ahb_clk);
-err_put_master:
-	platform_set_drvdata(pdev, NULL);
-	spi_master_put(master);
-err_out:
-	return err;
-}
-
-static int rb4xx_spi_remove(struct platform_device *pdev)
-{
-	struct rb4xx_spi *rbspi = platform_get_drvdata(pdev);
-
-	iounmap(rbspi->base);
-	clk_disable_unprepare(rbspi->ahb_clk);
-	clk_put(rbspi->ahb_clk);
-	platform_set_drvdata(pdev, NULL);
-	spi_master_put(rbspi->master);
-
-	return 0;
-}
-
-static struct platform_driver rb4xx_spi_drv = {
-	.probe		= rb4xx_spi_probe,
-	.remove		= rb4xx_spi_remove,
-	.driver		= {
-		.name	= DRV_NAME,
-		.owner	= THIS_MODULE,
-	},
-};
-
-static int __init rb4xx_spi_init(void)
-{
-	return platform_driver_register(&rb4xx_spi_drv);
-}
-subsys_initcall(rb4xx_spi_init);
-
-static void __exit rb4xx_spi_exit(void)
-{
-	platform_driver_unregister(&rb4xx_spi_drv);
-}
-
-module_exit(rb4xx_spi_exit);
-
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_VERSION(DRV_VERSION);
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_LICENSE("GPL v2");