spi: reorganize drivers

Sort the SPI makefile and enforce the naming convention spi_*.c for
spi drivers.

This change also rolls the contents of atmel_spi.h into the .c file
since there is only one user of that particular include file.

v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be
      be the predominant pattern for subsystem prefixes.
    - Clean up filenames in Kconfig and header comment blocks

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 529 deletions

diff --git a/drivers/spi/mpc52xx_psc_spi.c b/drivers/spi/mpc52xx_psc_spi.c
deleted file mode 100644
index e30baf0..0000000
--- a/drivers/spi/mpc52xx_psc_spi.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * MPC52xx PSC in SPI mode driver.
- *
- * Maintainer: Dragos Carp
- *
- * Copyright (C) 2006 TOPTICA Photonics AG.
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <linux/workqueue.h>
-#include <linux/completion.h>
-#include <linux/io.h>
-#include <linux/delay.h>
-#include <linux/spi/spi.h>
-#include <linux/fsl_devices.h>
-#include <linux/slab.h>
-
-#include <asm/mpc52xx.h>
-#include <asm/mpc52xx_psc.h>
-
-#define MCLK 20000000 /* PSC port MClk in hz */
-
-struct mpc52xx_psc_spi {
-	/* fsl_spi_platform data */
-	void (*cs_control)(struct spi_device *spi, bool on);
-	u32 sysclk;
-
-	/* driver internal data */
-	struct mpc52xx_psc __iomem *psc;
-	struct mpc52xx_psc_fifo __iomem *fifo;
-	unsigned int irq;
-	u8 bits_per_word;
-	u8 busy;
-
-	struct workqueue_struct *workqueue;
-	struct work_struct work;
-
-	struct list_head queue;
-	spinlock_t lock;
-
-	struct completion done;
-};
-
-/* controller state */
-struct mpc52xx_psc_spi_cs {
-	int bits_per_word;
-	int speed_hz;
-};
-
-/* set clock freq, clock ramp, bits per work
- * if t is NULL then reset the values to the default values
- */
-static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
-		struct spi_transfer *t)
-{
-	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
-
-	cs->speed_hz = (t && t->speed_hz)
-			? t->speed_hz : spi->max_speed_hz;
-	cs->bits_per_word = (t && t->bits_per_word)
-			? t->bits_per_word : spi->bits_per_word;
-	cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
-	return 0;
-}
-
-static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
-{
-	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
-	struct mpc52xx_psc __iomem *psc = mps->psc;
-	u32 sicr;
-	u16 ccr;
-
-	sicr = in_be32(&psc->sicr);
-
-	/* Set clock phase and polarity */
-	if (spi->mode & SPI_CPHA)
-		sicr |= 0x00001000;
-	else
-		sicr &= ~0x00001000;
-	if (spi->mode & SPI_CPOL)
-		sicr |= 0x00002000;
-	else
-		sicr &= ~0x00002000;
-
-	if (spi->mode & SPI_LSB_FIRST)
-		sicr |= 0x10000000;
-	else
-		sicr &= ~0x10000000;
-	out_be32(&psc->sicr, sicr);
-
-	/* Set clock frequency and bits per word
-	 * Because psc->ccr is defined as 16bit register instead of 32bit
-	 * just set the lower byte of BitClkDiv
-	 */
-	ccr = in_be16((u16 __iomem *)&psc->ccr);
-	ccr &= 0xFF00;
-	if (cs->speed_hz)
-		ccr |= (MCLK / cs->speed_hz - 1) & 0xFF;
-	else /* by default SPI Clk 1MHz */
-		ccr |= (MCLK / 1000000 - 1) & 0xFF;
-	out_be16((u16 __iomem *)&psc->ccr, ccr);
-	mps->bits_per_word = cs->bits_per_word;
-
-	if (mps->cs_control)
-		mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
-}
-
-static void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi)
-{
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
-
-	if (mps->cs_control)
-		mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
-}
-
-#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
-/* wake up when 80% fifo full */
-#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
-
-static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
-						struct spi_transfer *t)
-{
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
-	struct mpc52xx_psc __iomem *psc = mps->psc;
-	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
-	unsigned rb = 0;	/* number of bytes receieved */
-	unsigned sb = 0;	/* number of bytes sent */
-	unsigned char *rx_buf = (unsigned char *)t->rx_buf;
-	unsigned char *tx_buf = (unsigned char *)t->tx_buf;
-	unsigned rfalarm;
-	unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
-	unsigned recv_at_once;
-	int last_block = 0;
-
-	if (!t->tx_buf && !t->rx_buf && t->len)
-		return -EINVAL;
-
-	/* enable transmiter/receiver */
-	out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
-	while (rb < t->len) {
-		if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
-			rfalarm = MPC52xx_PSC_RFALARM;
-			last_block = 0;
-		} else {
-			send_at_once = t->len - sb;
-			rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
-			last_block = 1;
-		}
-
-		dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
-		for (; send_at_once; sb++, send_at_once--) {
-			/* set EOF flag before the last word is sent */
-			if (send_at_once == 1 && last_block)
-				out_8(&psc->ircr2, 0x01);
-
-			if (tx_buf)
-				out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
-			else
-				out_8(&psc->mpc52xx_psc_buffer_8, 0);
-		}
-
-
-		/* enable interrupts and wait for wake up
-		 * if just one byte is expected the Rx FIFO genererates no
-		 * FFULL interrupt, so activate the RxRDY interrupt
-		 */
-		out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
-		if (t->len - rb == 1) {
-			out_8(&psc->mode, 0);
-		} else {
-			out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
-			out_be16(&fifo->rfalarm, rfalarm);
-		}
-		out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
-		wait_for_completion(&mps->done);
-		recv_at_once = in_be16(&fifo->rfnum);
-		dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
-
-		send_at_once = recv_at_once;
-		if (rx_buf) {
-			for (; recv_at_once; rb++, recv_at_once--)
-				rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
-		} else {
-			for (; recv_at_once; rb++, recv_at_once--)
-				in_8(&psc->mpc52xx_psc_buffer_8);
-		}
-	}
-	/* disable transmiter/receiver */
-	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
-
-	return 0;
-}
-
-static void mpc52xx_psc_spi_work(struct work_struct *work)
-{
-	struct mpc52xx_psc_spi *mps =
-		container_of(work, struct mpc52xx_psc_spi, work);
-
-	spin_lock_irq(&mps->lock);
-	mps->busy = 1;
-	while (!list_empty(&mps->queue)) {
-		struct spi_message *m;
-		struct spi_device *spi;
-		struct spi_transfer *t = NULL;
-		unsigned cs_change;
-		int status;
-
-		m = container_of(mps->queue.next, struct spi_message, queue);
-		list_del_init(&m->queue);
-		spin_unlock_irq(&mps->lock);
-
-		spi = m->spi;
-		cs_change = 1;
-		status = 0;
-		list_for_each_entry (t, &m->transfers, transfer_list) {
-			if (t->bits_per_word || t->speed_hz) {
-				status = mpc52xx_psc_spi_transfer_setup(spi, t);
-				if (status < 0)
-					break;
-			}
-
-			if (cs_change)
-				mpc52xx_psc_spi_activate_cs(spi);
-			cs_change = t->cs_change;
-
-			status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
-			if (status)
-				break;
-			m->actual_length += t->len;
-
-			if (t->delay_usecs)
-				udelay(t->delay_usecs);
-
-			if (cs_change)
-				mpc52xx_psc_spi_deactivate_cs(spi);
-		}
-
-		m->status = status;
-		m->complete(m->context);
-
-		if (status || !cs_change)
-			mpc52xx_psc_spi_deactivate_cs(spi);
-
-		mpc52xx_psc_spi_transfer_setup(spi, NULL);
-
-		spin_lock_irq(&mps->lock);
-	}
-	mps->busy = 0;
-	spin_unlock_irq(&mps->lock);
-}
-
-static int mpc52xx_psc_spi_setup(struct spi_device *spi)
-{
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
-	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
-	unsigned long flags;
-
-	if (spi->bits_per_word%8)
-		return -EINVAL;
-
-	if (!cs) {
-		cs = kzalloc(sizeof *cs, GFP_KERNEL);
-		if (!cs)
-			return -ENOMEM;
-		spi->controller_state = cs;
-	}
-
-	cs->bits_per_word = spi->bits_per_word;
-	cs->speed_hz = spi->max_speed_hz;
-
-	spin_lock_irqsave(&mps->lock, flags);
-	if (!mps->busy)
-		mpc52xx_psc_spi_deactivate_cs(spi);
-	spin_unlock_irqrestore(&mps->lock, flags);
-
-	return 0;
-}
-
-static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
-		struct spi_message *m)
-{
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
-	unsigned long flags;
-
-	m->actual_length = 0;
-	m->status = -EINPROGRESS;
-
-	spin_lock_irqsave(&mps->lock, flags);
-	list_add_tail(&m->queue, &mps->queue);
-	queue_work(mps->workqueue, &mps->work);
-	spin_unlock_irqrestore(&mps->lock, flags);
-
-	return 0;
-}
-
-static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
-{
-	kfree(spi->controller_state);
-}
-
-static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
-{
-	struct mpc52xx_psc __iomem *psc = mps->psc;
-	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
-	u32 mclken_div;
-	int ret;
-
-	/* default sysclk is 512MHz */
-	mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK;
-	ret = mpc52xx_set_psc_clkdiv(psc_id, mclken_div);
-	if (ret)
-		return ret;
-
-	/* Reset the PSC into a known state */
-	out_8(&psc->command, MPC52xx_PSC_RST_RX);
-	out_8(&psc->command, MPC52xx_PSC_RST_TX);
-	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
-
-	/* Disable interrupts, interrupts are based on alarm level */
-	out_be16(&psc->mpc52xx_psc_imr, 0);
-	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
-	out_8(&fifo->rfcntl, 0);
-	out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
-
-	/* Configure 8bit codec mode as a SPI master and use EOF flags */
-	/* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
-	out_be32(&psc->sicr, 0x0180C800);
-	out_be16((u16 __iomem *)&psc->ccr, 0x070F); /* default SPI Clk 1MHz */
-
-	/* Set 2ms DTL delay */
-	out_8(&psc->ctur, 0x00);
-	out_8(&psc->ctlr, 0x84);
-
-	mps->bits_per_word = 8;
-
-	return 0;
-}
-
-static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
-{
-	struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
-	struct mpc52xx_psc __iomem *psc = mps->psc;
-
-	/* disable interrupt and wake up the work queue */
-	if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
-		out_be16(&psc->mpc52xx_psc_imr, 0);
-		complete(&mps->done);
-		return IRQ_HANDLED;
-	}
-	return IRQ_NONE;
-}
-
-/* bus_num is used only for the case dev->platform_data == NULL */
-static int __devinit mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
-				u32 size, unsigned int irq, s16 bus_num)
-{
-	struct fsl_spi_platform_data *pdata = dev->platform_data;
-	struct mpc52xx_psc_spi *mps;
-	struct spi_master *master;
-	int ret;
-
-	master = spi_alloc_master(dev, sizeof *mps);
-	if (master == NULL)
-		return -ENOMEM;
-
-	dev_set_drvdata(dev, master);
-	mps = spi_master_get_devdata(master);
-
-	/* the spi->mode bits understood by this driver: */
-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
-
-	mps->irq = irq;
-	if (pdata == NULL) {
-		dev_warn(dev, "probe called without platform data, no "
-				"cs_control function will be called\n");
-		mps->cs_control = NULL;
-		mps->sysclk = 0;
-		master->bus_num = bus_num;
-		master->num_chipselect = 255;
-	} else {
-		mps->cs_control = pdata->cs_control;
-		mps->sysclk = pdata->sysclk;
-		master->bus_num = pdata->bus_num;
-		master->num_chipselect = pdata->max_chipselect;
-	}
-	master->setup = mpc52xx_psc_spi_setup;
-	master->transfer = mpc52xx_psc_spi_transfer;
-	master->cleanup = mpc52xx_psc_spi_cleanup;
-	master->dev.of_node = dev->of_node;
-
-	mps->psc = ioremap(regaddr, size);
-	if (!mps->psc) {
-		dev_err(dev, "could not ioremap I/O port range\n");
-		ret = -EFAULT;
-		goto free_master;
-	}
-	/* On the 5200, fifo regs are immediately ajacent to the psc regs */
-	mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc);
-
-	ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi",
-				mps);
-	if (ret)
-		goto free_master;
-
-	ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
-	if (ret < 0) {
-		dev_err(dev, "can't configure PSC! Is it capable of SPI?\n");
-		goto free_irq;
-	}
-
-	spin_lock_init(&mps->lock);
-	init_completion(&mps->done);
-	INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
-	INIT_LIST_HEAD(&mps->queue);
-
-	mps->workqueue = create_singlethread_workqueue(
-		dev_name(master->dev.parent));
-	if (mps->workqueue == NULL) {
-		ret = -EBUSY;
-		goto free_irq;
-	}
-
-	ret = spi_register_master(master);
-	if (ret < 0)
-		goto unreg_master;
-
-	return ret;
-
-unreg_master:
-	destroy_workqueue(mps->workqueue);
-free_irq:
-	free_irq(mps->irq, mps);
-free_master:
-	if (mps->psc)
-		iounmap(mps->psc);
-	spi_master_put(master);
-
-	return ret;
-}
-
-static int __devinit mpc52xx_psc_spi_of_probe(struct platform_device *op)
-{
-	const u32 *regaddr_p;
-	u64 regaddr64, size64;
-	s16 id = -1;
-
-	regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL);
-	if (!regaddr_p) {
-		dev_err(&op->dev, "Invalid PSC address\n");
-		return -EINVAL;
-	}
-	regaddr64 = of_translate_address(op->dev.of_node, regaddr_p);
-
-	/* get PSC id (1..6, used by port_config) */
-	if (op->dev.platform_data == NULL) {
-		const u32 *psc_nump;
-
-		psc_nump = of_get_property(op->dev.of_node, "cell-index", NULL);
-		if (!psc_nump || *psc_nump > 5) {
-			dev_err(&op->dev, "Invalid cell-index property\n");
-			return -EINVAL;
-		}
-		id = *psc_nump + 1;
-	}
-
-	return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
-				irq_of_parse_and_map(op->dev.of_node, 0), id);
-}
-
-static int __devexit mpc52xx_psc_spi_of_remove(struct platform_device *op)
-{
-	struct spi_master *master = dev_get_drvdata(&op->dev);
-	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
-
-	flush_workqueue(mps->workqueue);
-	destroy_workqueue(mps->workqueue);
-	spi_unregister_master(master);
-	free_irq(mps->irq, mps);
-	if (mps->psc)
-		iounmap(mps->psc);
-
-	return 0;
-}
-
-static const struct of_device_id mpc52xx_psc_spi_of_match[] = {
-	{ .compatible = "fsl,mpc5200-psc-spi", },
-	{ .compatible = "mpc5200-psc-spi", }, /* old */
-	{}
-};
-
-MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);
-
-static struct platform_driver mpc52xx_psc_spi_of_driver = {
-	.probe = mpc52xx_psc_spi_of_probe,
-	.remove = __devexit_p(mpc52xx_psc_spi_of_remove),
-	.driver = {
-		.name = "mpc52xx-psc-spi",
-		.owner = THIS_MODULE,
-		.of_match_table = mpc52xx_psc_spi_of_match,
-	},
-};
-
-static int __init mpc52xx_psc_spi_init(void)
-{
-	return platform_driver_register(&mpc52xx_psc_spi_of_driver);
-}
-module_init(mpc52xx_psc_spi_init);
-
-static void __exit mpc52xx_psc_spi_exit(void)
-{
-	platform_driver_unregister(&mpc52xx_psc_spi_of_driver);
-}
-module_exit(mpc52xx_psc_spi_exit);
-
-MODULE_AUTHOR("Dragos Carp");
-MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
-MODULE_LICENSE("GPL");