[linux-2.6-block.git] / drivers / spi / mpc52xx_psc_spi.c

/*
 * 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_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 <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 = 0;

	/* default sysclk is 512MHz */
	mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK;
	mpc52xx_set_psc_clkdiv(psc_id, mclken_div);

	/* 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 ret;
}

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 __init 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;

	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)
		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 __exit mpc52xx_psc_spi_do_remove(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(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 int __init mpc52xx_psc_spi_of_probe(struct of_device *op,
	const struct of_device_id *match)
{
	const u32 *regaddr_p;
	u64 regaddr64, size64;
	s16 id = -1;

	regaddr_p = of_get_address(op->node, 0, &size64, NULL);
	if (!regaddr_p) {
		printk(KERN_ERR "Invalid PSC address\n");
		return -EINVAL;
	}
	regaddr64 = of_translate_address(op->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->node, "cell-index", NULL);
		if (!psc_nump || *psc_nump > 5) {
			printk(KERN_ERR "mpc52xx_psc_spi: Device node %s has invalid "
					"cell-index property\n", op->node->full_name);
			return -EINVAL;
		}
		id = *psc_nump + 1;
	}

	return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
					irq_of_parse_and_map(op->node, 0), id);
}

static int __exit mpc52xx_psc_spi_of_remove(struct of_device *op)
{
	return mpc52xx_psc_spi_do_remove(&op->dev);
}

static 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 of_platform_driver mpc52xx_psc_spi_of_driver = {
	.owner = THIS_MODULE,
	.name = "mpc52xx-psc-spi",
	.match_table = mpc52xx_psc_spi_of_match,
	.probe = mpc52xx_psc_spi_of_probe,
	.remove = __exit_p(mpc52xx_psc_spi_of_remove),
	.driver = {
		.name = "mpc52xx-psc-spi",
		.owner = THIS_MODULE,
	},
};

static int __init mpc52xx_psc_spi_init(void)
{
	return of_register_platform_driver(&mpc52xx_psc_spi_of_driver);
}
module_init(mpc52xx_psc_spi_init);

static void __exit mpc52xx_psc_spi_exit(void)
{
	of_unregister_platform_driver(&mpc52xx_psc_spi_of_driver);
}
module_exit(mpc52xx_psc_spi_exit);

MODULE_AUTHOR("Dragos Carp");
MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
00b8fd23	1	/*
57cc0979	2	* MPC52xx PSC in SPI mode driver.
00b8fd23 DC	3	*
	4	* Maintainer: Dragos Carp
	5	*
	6	* Copyright (C) 2006 TOPTICA Photonics AG.
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/init.h>
73902842	16	#include <linux/types.h>
00b8fd23 DC	17	#include <linux/errno.h>
00b8fd23 DC	18	#include <linux/interrupt.h>
76ef7dd0	19	#include <linux/of_platform.h>
00b8fd23 DC	20	#include <linux/workqueue.h>
	21	#include <linux/completion.h>
	22	#include <linux/io.h>
	23	#include <linux/delay.h>
	24	#include <linux/spi/spi.h>
	25	#include <linux/fsl_devices.h>
	26
	27	#include <asm/mpc52xx.h>
	28	#include <asm/mpc52xx_psc.h>
	29
	30	#define MCLK 20000000 /* PSC port MClk in hz */
	31
	32	struct mpc52xx_psc_spi {
	33	/* fsl_spi_platform data */
73902842	34	void (cs_control)(struct spi_device spi, bool on);
00b8fd23 DC	35	u32 sysclk;
	36
	37	/* driver internal data */
	38	struct mpc52xx_psc __iomem *psc;
4874cc1b	39	struct mpc52xx_psc_fifo __iomem *fifo;
00b8fd23 DC	40	unsigned int irq;
	41	u8 bits_per_word;
	42	u8 busy;
	43
	44	struct workqueue_struct *workqueue;
	45	struct work_struct work;
	46
	47	struct list_head queue;
	48	spinlock_t lock;
	49
	50	struct completion done;
	51	};
	52
	53	/* controller state */
	54	struct mpc52xx_psc_spi_cs {
	55	int bits_per_word;
	56	int speed_hz;
	57	};
	58
	59	/* set clock freq, clock ramp, bits per work
	60	* if t is NULL then reset the values to the default values
	61	*/
	62	static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
	63	struct spi_transfer *t)
	64	{
	65	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
	66
	67	cs->speed_hz = (t && t->speed_hz)
	68	? t->speed_hz : spi->max_speed_hz;
	69	cs->bits_per_word = (t && t->bits_per_word)
	70	? t->bits_per_word : spi->bits_per_word;
	71	cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
	72	return 0;
	73	}
	74
	75	static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
	76	{
	77	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
	78	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
	79	struct mpc52xx_psc __iomem *psc = mps->psc;
	80	u32 sicr;
	81	u16 ccr;
	82
	83	sicr = in_be32(&psc->sicr);
	84
	85	/* Set clock phase and polarity */
	86	if (spi->mode & SPI_CPHA)
	87	sicr \|= 0x00001000;
	88	else
	89	sicr &= ~0x00001000;
	90	if (spi->mode & SPI_CPOL)
	91	sicr \|= 0x00002000;
	92	else
	93	sicr &= ~0x00002000;
	94
	95	if (spi->mode & SPI_LSB_FIRST)
	96	sicr \|= 0x10000000;
	97	else
	98	sicr &= ~0x10000000;
	99	out_be32(&psc->sicr, sicr);
	100
	101	/* Set clock frequency and bits per word
	102	* Because psc->ccr is defined as 16bit register instead of 32bit
	103	* just set the lower byte of BitClkDiv
104	*/
a897ea13	105	ccr = in_be16((u16 __iomem *)&psc->ccr);
00b8fd23 DC	106	ccr &= 0xFF00;
	107	if (cs->speed_hz)
	108	ccr \|= (MCLK / cs->speed_hz - 1) & 0xFF;
	109	else /* by default SPI Clk 1MHz */
	110	ccr \|= (MCLK / 1000000 - 1) & 0xFF;
a897ea13	111	out_be16((u16 __iomem *)&psc->ccr, ccr);
00b8fd23 DC	112	mps->bits_per_word = cs->bits_per_word;
00b8fd23 DC	113
73902842 AV	114	if (mps->cs_control)
73902842 AV	115	mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
00b8fd23 DC	116	}
	117
	118	static void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi)
	119	{
	120	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
	121
73902842 AV	122	if (mps->cs_control)
73902842 AV	123	mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
00b8fd23 DC	124	}
	125
	126	#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
	127	/* wake up when 80% fifo full */
	128	#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
	129
	130	static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
	131	struct spi_transfer *t)
	132	{
	133	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
	134	struct mpc52xx_psc __iomem *psc = mps->psc;
4874cc1b	135	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
00b8fd23 DC	136	unsigned rb = 0; /* number of bytes receieved */
	137	unsigned sb = 0; /* number of bytes sent */
	138	unsigned char rx_buf = (unsigned char )t->rx_buf;
	139	unsigned char tx_buf = (unsigned char )t->tx_buf;
	140	unsigned rfalarm;
	141	unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
	142	unsigned recv_at_once;
b7d271df	143	int last_block = 0;
00b8fd23 DC	144
	145	if (!t->tx_buf && !t->rx_buf && t->len)
	146	return -EINVAL;
	147
	148	/* enable transmiter/receiver */
	149	out_8(&psc->command, MPC52xx_PSC_TX_ENABLE \| MPC52xx_PSC_RX_ENABLE);
	150	while (rb < t->len) {
	151	if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
	152	rfalarm = MPC52xx_PSC_RFALARM;
b7d271df	153	last_block = 0;
00b8fd23 DC	154	} else {
	155	send_at_once = t->len - sb;
	156	rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
b7d271df	157	last_block = 1;
00b8fd23 DC	158	}
	159
	160	dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
9a7867e1 LF	161	for (; send_at_once; sb++, send_at_once--) {
9a7867e1 LF	162	/* set EOF flag before the last word is sent */
b7d271df	163	if (send_at_once == 1 && last_block)
9a7867e1 LF	164	out_8(&psc->ircr2, 0x01);
	165
	166	if (tx_buf)
00b8fd23	167	out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
9a7867e1	168	else
00b8fd23	169	out_8(&psc->mpc52xx_psc_buffer_8, 0);
00b8fd23 DC	170	}
	171
	172
3a4fa0a2	173	/* enable interrupts and wait for wake up
00b8fd23 DC	174	* if just one byte is expected the Rx FIFO genererates no
	175	* FFULL interrupt, so activate the RxRDY interrupt
	176	*/
	177	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
	178	if (t->len - rb == 1) {
	179	out_8(&psc->mode, 0);
	180	} else {
	181	out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
4874cc1b	182	out_be16(&fifo->rfalarm, rfalarm);
00b8fd23 DC	183	}
	184	out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
	185	wait_for_completion(&mps->done);
4874cc1b	186	recv_at_once = in_be16(&fifo->rfnum);
00b8fd23 DC	187	dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
	188
	189	send_at_once = recv_at_once;
	190	if (rx_buf) {
	191	for (; recv_at_once; rb++, recv_at_once--)
	192	rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
	193	} else {
	194	for (; recv_at_once; rb++, recv_at_once--)
	195	in_8(&psc->mpc52xx_psc_buffer_8);
	196	}
	197	}
	198	/* disable transmiter/receiver */
	199	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE \| MPC52xx_PSC_RX_DISABLE);
	200
	201	return 0;
	202	}
	203
	204	static void mpc52xx_psc_spi_work(struct work_struct *work)
	205	{
	206	struct mpc52xx_psc_spi *mps =
	207	container_of(work, struct mpc52xx_psc_spi, work);
	208
	209	spin_lock_irq(&mps->lock);
	210	mps->busy = 1;
	211	while (!list_empty(&mps->queue)) {
	212	struct spi_message *m;
	213	struct spi_device *spi;
	214	struct spi_transfer *t = NULL;
	215	unsigned cs_change;
	216	int status;
	217
	218	m = container_of(mps->queue.next, struct spi_message, queue);
	219	list_del_init(&m->queue);
	220	spin_unlock_irq(&mps->lock);
	221
	222	spi = m->spi;
	223	cs_change = 1;
	224	status = 0;
	225	list_for_each_entry (t, &m->transfers, transfer_list) {
	226	if (t->bits_per_word \|\| t->speed_hz) {
	227	status = mpc52xx_psc_spi_transfer_setup(spi, t);
	228	if (status < 0)
	229	break;
	230	}
	231
	232	if (cs_change)
	233	mpc52xx_psc_spi_activate_cs(spi);
	234	cs_change = t->cs_change;
	235
	236	status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
	237	if (status)
	238	break;
	239	m->actual_length += t->len;
	240
	241	if (t->delay_usecs)
	242	udelay(t->delay_usecs);
	243
	244	if (cs_change)
	245	mpc52xx_psc_spi_deactivate_cs(spi);
	246	}
	247
	248	m->status = status;
	249	m->complete(m->context);
	250
251	if (status \|\| !cs_change)
252	mpc52xx_psc_spi_deactivate_cs(spi);
253
254	mpc52xx_psc_spi_transfer_setup(spi, NULL);
255
256	spin_lock_irq(&mps->lock);
257	}
258	mps->busy = 0;
259	spin_unlock_irq(&mps->lock);
260	}
261
262	static int mpc52xx_psc_spi_setup(struct spi_device *spi)
263	{
264	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
265	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
266	unsigned long flags;
267
268	if (spi->bits_per_word%8)
269	return -EINVAL;
270
271	if (!cs) {
272	cs = kzalloc(sizeof *cs, GFP_KERNEL);
273	if (!cs)
274	return -ENOMEM;
275	spi->controller_state = cs;
276	}
277
278	cs->bits_per_word = spi->bits_per_word;
279	cs->speed_hz = spi->max_speed_hz;
280
281	spin_lock_irqsave(&mps->lock, flags);
282	if (!mps->busy)
283	mpc52xx_psc_spi_deactivate_cs(spi);
284	spin_unlock_irqrestore(&mps->lock, flags);
285
286	return 0;
287	}
288
289	static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
290	struct spi_message *m)
291	{
292	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
293	unsigned long flags;
294
295	m->actual_length = 0;
296	m->status = -EINPROGRESS;
297
298	spin_lock_irqsave(&mps->lock, flags);
299	list_add_tail(&m->queue, &mps->queue);
300	queue_work(mps->workqueue, &mps->work);
301	spin_unlock_irqrestore(&mps->lock, flags);
302
303	return 0;
304	}
305
306	static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
307	{
308	kfree(spi->controller_state);
309	}
310
311	static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
312	{
00b8fd23	313	struct mpc52xx_psc __iomem *psc = mps->psc;
4874cc1b	314	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
00b8fd23 DC	315	u32 mclken_div;
	316	int ret = 0;
	317
00b8fd23	318	/* default sysclk is 512MHz */
4fb4c558 GL	319	mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK;
4fb4c558 GL	320	mpc52xx_set_psc_clkdiv(psc_id, mclken_div);
00b8fd23 DC	321
	322	/* Reset the PSC into a known state */
	323	out_8(&psc->command, MPC52xx_PSC_RST_RX);
	324	out_8(&psc->command, MPC52xx_PSC_RST_TX);
	325	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE \| MPC52xx_PSC_RX_DISABLE);
	326
	327	/* Disable interrupts, interrupts are based on alarm level */
	328	out_be16(&psc->mpc52xx_psc_imr, 0);
	329	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
4874cc1b	330	out_8(&fifo->rfcntl, 0);
00b8fd23 DC	331	out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
	332
	333	/* Configure 8bit codec mode as a SPI master and use EOF flags */
	334	/* SICR_SIM_CODEC8\|SICR_GENCLK\|SICR_SPI\|SICR_MSTR\|SICR_USEEOF */
	335	out_be32(&psc->sicr, 0x0180C800);
a897ea13	336	out_be16((u16 __iomem )&psc->ccr, 0x070F); / default SPI Clk 1MHz */
00b8fd23 DC	337
	338	/* Set 2ms DTL delay */
	339	out_8(&psc->ctur, 0x00);
	340	out_8(&psc->ctlr, 0x84);
	341
	342	mps->bits_per_word = 8;
	343
00b8fd23 DC	344	return ret;
	345	}
	346
	347	static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
	348	{
	349	struct mpc52xx_psc_spi mps = (struct mpc52xx_psc_spi )dev_id;
	350	struct mpc52xx_psc __iomem *psc = mps->psc;
	351
	352	/* disable interrupt and wake up the work queue */
	353	if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
	354	out_be16(&psc->mpc52xx_psc_imr, 0);
	355	complete(&mps->done);
	356	return IRQ_HANDLED;
	357	}
	358	return IRQ_NONE;
	359	}
	360
	361	/* bus_num is used only for the case dev->platform_data == NULL */
	362	static int __init mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
	363	u32 size, unsigned int irq, s16 bus_num)
	364	{
	365	struct fsl_spi_platform_data *pdata = dev->platform_data;
	366	struct mpc52xx_psc_spi *mps;
	367	struct spi_master *master;
	368	int ret;
	369
00b8fd23 DC	370	master = spi_alloc_master(dev, sizeof *mps);
	371	if (master == NULL)
	372	return -ENOMEM;
	373
	374	dev_set_drvdata(dev, master);
	375	mps = spi_master_get_devdata(master);
	376
e7db06b5 DB	377	/* the spi->mode bits understood by this driver: */
	378	master->mode_bits = SPI_CPOL \| SPI_CPHA \| SPI_CS_HIGH \| SPI_LSB_FIRST;
	379
00b8fd23 DC	380	mps->irq = irq;
	381	if (pdata == NULL) {
	382	dev_warn(dev, "probe called without platform data, no "
73902842 AV	383	"cs_control function will be called\n");
73902842 AV	384	mps->cs_control = NULL;
00b8fd23 DC	385	mps->sysclk = 0;
	386	master->bus_num = bus_num;
	387	master->num_chipselect = 255;
	388	} else {
73902842	389	mps->cs_control = pdata->cs_control;
00b8fd23 DC	390	mps->sysclk = pdata->sysclk;
	391	master->bus_num = pdata->bus_num;
	392	master->num_chipselect = pdata->max_chipselect;
	393	}
	394	master->setup = mpc52xx_psc_spi_setup;
	395	master->transfer = mpc52xx_psc_spi_transfer;
	396	master->cleanup = mpc52xx_psc_spi_cleanup;
	397
	398	mps->psc = ioremap(regaddr, size);
	399	if (!mps->psc) {
	400	dev_err(dev, "could not ioremap I/O port range\n");
	401	ret = -EFAULT;
	402	goto free_master;
	403	}
4874cc1b GL	404	/* On the 5200, fifo regs are immediately ajacent to the psc regs */
4874cc1b GL	405	mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc);
00b8fd23 DC	406
	407	ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi",
	408	mps);
	409	if (ret)
	410	goto free_master;
	411
	412	ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
	413	if (ret < 0)
	414	goto free_irq;
	415
	416	spin_lock_init(&mps->lock);
	417	init_completion(&mps->done);
	418	INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
	419	INIT_LIST_HEAD(&mps->queue);
	420
	421	mps->workqueue = create_singlethread_workqueue(
6c7377ab	422	dev_name(master->dev.parent));
00b8fd23 DC	423	if (mps->workqueue == NULL) {
	424	ret = -EBUSY;
	425	goto free_irq;
	426	}
	427
	428	ret = spi_register_master(master);
	429	if (ret < 0)
	430	goto unreg_master;
	431
	432	return ret;
	433
	434	unreg_master:
	435	destroy_workqueue(mps->workqueue);
	436	free_irq:
	437	free_irq(mps->irq, mps);
	438	free_master:
	439	if (mps->psc)
	440	iounmap(mps->psc);
	441	spi_master_put(master);
	442
	443	return ret;
	444	}
	445
	446	static int __exit mpc52xx_psc_spi_do_remove(struct device *dev)
	447	{
	448	struct spi_master *master = dev_get_drvdata(dev);
	449	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
	450
	451	flush_workqueue(mps->workqueue);
	452	destroy_workqueue(mps->workqueue);
	453	spi_unregister_master(master);
	454	free_irq(mps->irq, mps);
	455	if (mps->psc)
	456	iounmap(mps->psc);
	457
	458	return 0;
	459	}
	460
00b8fd23 DC	461	static int __init mpc52xx_psc_spi_of_probe(struct of_device *op,
	462	const struct of_device_id *match)
	463	{
	464	const u32 *regaddr_p;
	465	u64 regaddr64, size64;
	466	s16 id = -1;
	467
	468	regaddr_p = of_get_address(op->node, 0, &size64, NULL);
	469	if (!regaddr_p) {
	470	printk(KERN_ERR "Invalid PSC address\n");
	471	return -EINVAL;
	472	}
	473	regaddr64 = of_translate_address(op->node, regaddr_p);
	474
8888735f	475	/* get PSC id (1..6, used by port_config) */
00b8fd23	476	if (op->dev.platform_data == NULL) {
8888735f	477	const u32 *psc_nump;
00b8fd23	478
8888735f DP	479	psc_nump = of_get_property(op->node, "cell-index", NULL);
	480	if (!psc_nump \|\| *psc_nump > 5) {
	481	printk(KERN_ERR "mpc52xx_psc_spi: Device node %s has invalid "
	482	"cell-index property\n", op->node->full_name);
	483	return -EINVAL;
00b8fd23	484	}
8888735f	485	id = *psc_nump + 1;
00b8fd23 DC	486	}
	487
	488	return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
	489	irq_of_parse_and_map(op->node, 0), id);
	490	}
	491
	492	static int __exit mpc52xx_psc_spi_of_remove(struct of_device *op)
	493	{
	494	return mpc52xx_psc_spi_do_remove(&op->dev);
	495	}
	496
	497	static struct of_device_id mpc52xx_psc_spi_of_match[] = {
66ffbe49 GL	498	{ .compatible = "fsl,mpc5200-psc-spi", },
	499	{ .compatible = "mpc5200-psc-spi", }, /* old */
	500	{}
00b8fd23 DC	501	};
	502
	503	MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);
	504
	505	static struct of_platform_driver mpc52xx_psc_spi_of_driver = {
	506	.owner = THIS_MODULE,
	507	.name = "mpc52xx-psc-spi",
	508	.match_table = mpc52xx_psc_spi_of_match,
	509	.probe = mpc52xx_psc_spi_of_probe,
	510	.remove = __exit_p(mpc52xx_psc_spi_of_remove),
	511	.driver = {
	512	.name = "mpc52xx-psc-spi",
	513	.owner = THIS_MODULE,
	514	},
	515	};
	516
	517	static int __init mpc52xx_psc_spi_init(void)
	518	{
	519	return of_register_platform_driver(&mpc52xx_psc_spi_of_driver);
	520	}
	521	module_init(mpc52xx_psc_spi_init);
	522
	523	static void __exit mpc52xx_psc_spi_exit(void)
	524	{
	525	of_unregister_platform_driver(&mpc52xx_psc_spi_of_driver);
	526	}
	527	module_exit(mpc52xx_psc_spi_exit);
	528
00b8fd23 DC	529	MODULE_AUTHOR("Dragos Carp");
	530	MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
	531	MODULE_LICENSE("GPL");