[mirror_ubuntu-artful-kernel.git] / drivers / spi / spi-fsl-cpm.c

/*
 * Freescale SPI controller driver cpm functions.
 *
 * Maintainer: Kumar Gala
 *
 * Copyright (C) 2006 Polycom, Inc.
 * Copyright 2010 Freescale Semiconductor, Inc.
 *
 * CPM SPI and QE buffer descriptors mode support:
 * Copyright (c) 2009  MontaVista Software, Inc.
 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * 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 <asm/cpm.h>
#include <soc/fsl/qe/qe.h>
#include <linux/dma-mapping.h>
#include <linux/fsl_devices.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
#include <linux/platform_device.h>

#include "spi-fsl-cpm.h"
#include "spi-fsl-lib.h"
#include "spi-fsl-spi.h"

/* CPM1 and CPM2 are mutually exclusive. */
#ifdef CONFIG_CPM1
#include <asm/cpm1.h>
#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
#else
#include <asm/cpm2.h>
#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
#endif

#define	SPIE_TXB	0x00000200	/* Last char is written to tx fifo */
#define	SPIE_RXB	0x00000100	/* Last char is written to rx buf */

/* SPCOM register values */
#define	SPCOM_STR	(1 << 23)	/* Start transmit */

#define	SPI_PRAM_SIZE	0x100
#define	SPI_MRBLR	((unsigned int)PAGE_SIZE)

static void *fsl_dummy_rx;
static DEFINE_MUTEX(fsl_dummy_rx_lock);
static int fsl_dummy_rx_refcnt;

void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi)
{
	if (mspi->flags & SPI_QE) {
		qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
			     QE_CR_PROTOCOL_UNSPECIFIED, 0);
	} else {
		if (mspi->flags & SPI_CPM1) {
			out_be32(&mspi->pram->rstate, 0);
			out_be16(&mspi->pram->rbptr,
				 in_be16(&mspi->pram->rbase));
			out_be32(&mspi->pram->tstate, 0);
			out_be16(&mspi->pram->tbptr,
				 in_be16(&mspi->pram->tbase));
		} else {
			cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
		}
	}
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_reinit_txrx);

static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
{
	struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
	struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
	unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
	unsigned int xfer_ofs;
	struct fsl_spi_reg *reg_base = mspi->reg_base;

	xfer_ofs = mspi->xfer_in_progress->len - mspi->count;

	if (mspi->rx_dma == mspi->dma_dummy_rx)
		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
	else
		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
	out_be16(&rx_bd->cbd_datlen, 0);
	out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);

	if (mspi->tx_dma == mspi->dma_dummy_tx)
		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
	else
		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
	out_be16(&tx_bd->cbd_datlen, xfer_len);
	out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
				 BD_SC_LAST);

	/* start transfer */
	mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR);
}

int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
		     struct spi_transfer *t, bool is_dma_mapped)
{
	struct device *dev = mspi->dev;
	struct fsl_spi_reg *reg_base = mspi->reg_base;

	if (is_dma_mapped) {
		mspi->map_tx_dma = 0;
		mspi->map_rx_dma = 0;
	} else {
		mspi->map_tx_dma = 1;
		mspi->map_rx_dma = 1;
	}

	if (!t->tx_buf) {
		mspi->tx_dma = mspi->dma_dummy_tx;
		mspi->map_tx_dma = 0;
	}

	if (!t->rx_buf) {
		mspi->rx_dma = mspi->dma_dummy_rx;
		mspi->map_rx_dma = 0;
	}

	if (mspi->map_tx_dma) {
		void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */

		mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
					      DMA_TO_DEVICE);
		if (dma_mapping_error(dev, mspi->tx_dma)) {
			dev_err(dev, "unable to map tx dma\n");
			return -ENOMEM;
		}
	} else if (t->tx_buf) {
		mspi->tx_dma = t->tx_dma;
	}

	if (mspi->map_rx_dma) {
		mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
					      DMA_FROM_DEVICE);
		if (dma_mapping_error(dev, mspi->rx_dma)) {
			dev_err(dev, "unable to map rx dma\n");
			goto err_rx_dma;
		}
	} else if (t->rx_buf) {
		mspi->rx_dma = t->rx_dma;
	}

	/* enable rx ints */
	mpc8xxx_spi_write_reg(&reg_base->mask, SPIE_RXB);

	mspi->xfer_in_progress = t;
	mspi->count = t->len;

	/* start CPM transfers */
	fsl_spi_cpm_bufs_start(mspi);

	return 0;

err_rx_dma:
	if (mspi->map_tx_dma)
		dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
	return -ENOMEM;
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs);

void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
{
	struct device *dev = mspi->dev;
	struct spi_transfer *t = mspi->xfer_in_progress;

	if (mspi->map_tx_dma)
		dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
	if (mspi->map_rx_dma)
		dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
	mspi->xfer_in_progress = NULL;
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete);

void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
{
	u16 len;
	struct fsl_spi_reg *reg_base = mspi->reg_base;

	dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
		in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);

	len = in_be16(&mspi->rx_bd->cbd_datlen);
	if (len > mspi->count) {
		WARN_ON(1);
		len = mspi->count;
	}

	/* Clear the events */
	mpc8xxx_spi_write_reg(&reg_base->event, events);

	mspi->count -= len;
	if (mspi->count)
		fsl_spi_cpm_bufs_start(mspi);
	else
		complete(&mspi->done);
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_irq);

static void *fsl_spi_alloc_dummy_rx(void)
{
	mutex_lock(&fsl_dummy_rx_lock);

	if (!fsl_dummy_rx)
		fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
	if (fsl_dummy_rx)
		fsl_dummy_rx_refcnt++;

	mutex_unlock(&fsl_dummy_rx_lock);

	return fsl_dummy_rx;
}

static void fsl_spi_free_dummy_rx(void)
{
	mutex_lock(&fsl_dummy_rx_lock);

	switch (fsl_dummy_rx_refcnt) {
	case 0:
		WARN_ON(1);
		break;
	case 1:
		kfree(fsl_dummy_rx);
		fsl_dummy_rx = NULL;
		/* fall through */
	default:
		fsl_dummy_rx_refcnt--;
		break;
	}

	mutex_unlock(&fsl_dummy_rx_lock);
}

static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
{
	struct device *dev = mspi->dev;
	struct device_node *np = dev->of_node;
	const u32 *iprop;
	int size;
	void __iomem *spi_base;
	unsigned long pram_ofs = -ENOMEM;

	/* Can't use of_address_to_resource(), QE muram isn't at 0. */
	iprop = of_get_property(np, "reg", &size);

	/* QE with a fixed pram location? */
	if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
		return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);

	/* QE but with a dynamic pram location? */
	if (mspi->flags & SPI_QE) {
		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
		qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
			     QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
		return pram_ofs;
	}

	spi_base = of_iomap(np, 1);
	if (spi_base == NULL)
		return -EINVAL;

	if (mspi->flags & SPI_CPM2) {
		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
		out_be16(spi_base, pram_ofs);
	}

	iounmap(spi_base);
	return pram_ofs;
}

int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
{
	struct device *dev = mspi->dev;
	struct device_node *np = dev->of_node;
	const u32 *iprop;
	int size;
	unsigned long bds_ofs;

	if (!(mspi->flags & SPI_CPM_MODE))
		return 0;

	if (!fsl_spi_alloc_dummy_rx())
		return -ENOMEM;

	if (mspi->flags & SPI_QE) {
		iprop = of_get_property(np, "cell-index", &size);
		if (iprop && size == sizeof(*iprop))
			mspi->subblock = *iprop;

		switch (mspi->subblock) {
		default:
			dev_warn(dev, "cell-index unspecified, assuming SPI1\n");
			/* fall through */
		case 0:
			mspi->subblock = QE_CR_SUBBLOCK_SPI1;
			break;
		case 1:
			mspi->subblock = QE_CR_SUBBLOCK_SPI2;
			break;
		}
	}

	if (mspi->flags & SPI_CPM1) {
		struct resource *res;
		void *pram;

		res = platform_get_resource(to_platform_device(dev),
					    IORESOURCE_MEM, 1);
		pram = devm_ioremap_resource(dev, res);
		if (IS_ERR(pram))
			mspi->pram = NULL;
		else
			mspi->pram = pram;
	} else {
		unsigned long pram_ofs = fsl_spi_cpm_get_pram(mspi);

		if (IS_ERR_VALUE(pram_ofs))
			mspi->pram = NULL;
		else
			mspi->pram = cpm_muram_addr(pram_ofs);
	}
	if (mspi->pram == NULL) {
		dev_err(dev, "can't allocate spi parameter ram\n");
		goto err_pram;
	}

	bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
				  sizeof(*mspi->rx_bd), 8);
	if (IS_ERR_VALUE(bds_ofs)) {
		dev_err(dev, "can't allocate bds\n");
		goto err_bds;
	}

	mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
					    DMA_TO_DEVICE);
	if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
		dev_err(dev, "unable to map dummy tx buffer\n");
		goto err_dummy_tx;
	}

	mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
					    DMA_FROM_DEVICE);
	if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
		dev_err(dev, "unable to map dummy rx buffer\n");
		goto err_dummy_rx;
	}

	mspi->tx_bd = cpm_muram_addr(bds_ofs);
	mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));

	/* Initialize parameter ram. */
	out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
	out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
	out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
	out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
	out_be16(&mspi->pram->mrblr, SPI_MRBLR);
	out_be32(&mspi->pram->rstate, 0);
	out_be32(&mspi->pram->rdp, 0);
	out_be16(&mspi->pram->rbptr, 0);
	out_be16(&mspi->pram->rbc, 0);
	out_be32(&mspi->pram->rxtmp, 0);
	out_be32(&mspi->pram->tstate, 0);
	out_be32(&mspi->pram->tdp, 0);
	out_be16(&mspi->pram->tbptr, 0);
	out_be16(&mspi->pram->tbc, 0);
	out_be32(&mspi->pram->txtmp, 0);

	return 0;

err_dummy_rx:
	dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
err_dummy_tx:
	cpm_muram_free(bds_ofs);
err_bds:
	if (!(mspi->flags & SPI_CPM1))
		cpm_muram_free(cpm_muram_offset(mspi->pram));
err_pram:
	fsl_spi_free_dummy_rx();
	return -ENOMEM;
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_init);

void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
{
	struct device *dev = mspi->dev;

	if (!(mspi->flags & SPI_CPM_MODE))
		return;

	dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
	dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
	cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
	cpm_muram_free(cpm_muram_offset(mspi->pram));
	fsl_spi_free_dummy_rx();
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_free);

MODULE_LICENSE("GPL");
Commit	Line	Data
e8beacbb AL	1	/*
	2	* Freescale SPI controller driver cpm functions.
	3	*
	4	* Maintainer: Kumar Gala
	5	*
	6	* Copyright (C) 2006 Polycom, Inc.
	7	* Copyright 2010 Freescale Semiconductor, Inc.
	8	*
	9	* CPM SPI and QE buffer descriptors mode support:
	10	* Copyright (c) 2009 MontaVista Software, Inc.
	11	* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
	12	*
	13	* This program is free software; you can redistribute it and/or modify it
	14	* under the terms of the GNU General Public License as published by the
	15	* Free Software Foundation; either version 2 of the License, or (at your
	16	* option) any later version.
	17	*/
e8beacbb	18	#include <asm/cpm.h>
7aa1aa6e	19	#include <soc/fsl/qe/qe.h>
a3108360 XL	20	#include <linux/dma-mapping.h>
	21	#include <linux/fsl_devices.h>
	22	#include <linux/kernel.h>
38455d7a	23	#include <linux/module.h>
a3108360 XL	24	#include <linux/of_address.h>
	25	#include <linux/spi/spi.h>
	26	#include <linux/types.h>
575bec53	27	#include <linux/platform_device.h>
e8beacbb	28
e8beacbb	29	#include "spi-fsl-cpm.h"
a3108360	30	#include "spi-fsl-lib.h"
e8beacbb AL	31	#include "spi-fsl-spi.h"
	32
	33	/* CPM1 and CPM2 are mutually exclusive. */
	34	#ifdef CONFIG_CPM1
	35	#include <asm/cpm1.h>
	36	#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
	37	#else
	38	#include <asm/cpm2.h>
	39	#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
	40	#endif
	41
	42	#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */
	43	#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */
	44
	45	/* SPCOM register values */
	46	#define SPCOM_STR (1 << 23) /* Start transmit */
	47
	48	#define SPI_PRAM_SIZE 0x100
	49	#define SPI_MRBLR ((unsigned int)PAGE_SIZE)
	50
	51	static void *fsl_dummy_rx;
	52	static DEFINE_MUTEX(fsl_dummy_rx_lock);
	53	static int fsl_dummy_rx_refcnt;
	54
	55	void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi)
	56	{
	57	if (mspi->flags & SPI_QE) {
	58	qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
	59	QE_CR_PROTOCOL_UNSPECIFIED, 0);
	60	} else {
e8beacbb	61	if (mspi->flags & SPI_CPM1) {
194ed900	62	out_be32(&mspi->pram->rstate, 0);
e8beacbb AL	63	out_be16(&mspi->pram->rbptr,
e8beacbb AL	64	in_be16(&mspi->pram->rbase));
194ed900	65	out_be32(&mspi->pram->tstate, 0);
e8beacbb AL	66	out_be16(&mspi->pram->tbptr,
e8beacbb AL	67	in_be16(&mspi->pram->tbase));
194ed900 CL	68	} else {
194ed900 CL	69	cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
e8beacbb AL	70	}
	71	}
	72	}
38455d7a	73	EXPORT_SYMBOL_GPL(fsl_spi_cpm_reinit_txrx);
e8beacbb AL	74
	75	static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
	76	{
	77	struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
	78	struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
	79	unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
	80	unsigned int xfer_ofs;
	81	struct fsl_spi_reg *reg_base = mspi->reg_base;
	82
	83	xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
	84
	85	if (mspi->rx_dma == mspi->dma_dummy_rx)
	86	out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
	87	else
	88	out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
	89	out_be16(&rx_bd->cbd_datlen, 0);
	90	out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY \| BD_SC_INTRPT \| BD_SC_WRAP);
	91
	92	if (mspi->tx_dma == mspi->dma_dummy_tx)
	93	out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
	94	else
	95	out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
	96	out_be16(&tx_bd->cbd_datlen, xfer_len);
	97	out_be16(&tx_bd->cbd_sc, BD_SC_READY \| BD_SC_INTRPT \| BD_SC_WRAP \|
	98	BD_SC_LAST);
	99
	100	/* start transfer */
	101	mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR);
	102	}
	103
	104	int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
	105	struct spi_transfer *t, bool is_dma_mapped)
	106	{
	107	struct device *dev = mspi->dev;
	108	struct fsl_spi_reg *reg_base = mspi->reg_base;
	109
	110	if (is_dma_mapped) {
	111	mspi->map_tx_dma = 0;
	112	mspi->map_rx_dma = 0;
	113	} else {
	114	mspi->map_tx_dma = 1;
	115	mspi->map_rx_dma = 1;
	116	}
	117
	118	if (!t->tx_buf) {
	119	mspi->tx_dma = mspi->dma_dummy_tx;
	120	mspi->map_tx_dma = 0;
	121	}
	122
	123	if (!t->rx_buf) {
	124	mspi->rx_dma = mspi->dma_dummy_rx;
	125	mspi->map_rx_dma = 0;
	126	}
	127
	128	if (mspi->map_tx_dma) {
	129	void nonconst_tx = (void )mspi->tx; /* shut up gcc */
	130
	131	mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
	132	DMA_TO_DEVICE);
	133	if (dma_mapping_error(dev, mspi->tx_dma)) {
	134	dev_err(dev, "unable to map tx dma\n");
	135	return -ENOMEM;
	136	}
	137	} else if (t->tx_buf) {
138	mspi->tx_dma = t->tx_dma;
139	}
140
141	if (mspi->map_rx_dma) {
142	mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
143	DMA_FROM_DEVICE);
144	if (dma_mapping_error(dev, mspi->rx_dma)) {
145	dev_err(dev, "unable to map rx dma\n");
146	goto err_rx_dma;
147	}
148	} else if (t->rx_buf) {
149	mspi->rx_dma = t->rx_dma;
150	}
151
152	/* enable rx ints */
153	mpc8xxx_spi_write_reg(&reg_base->mask, SPIE_RXB);
154
155	mspi->xfer_in_progress = t;
156	mspi->count = t->len;
157
158	/* start CPM transfers */
159	fsl_spi_cpm_bufs_start(mspi);
160
161	return 0;
162
163	err_rx_dma:
164	if (mspi->map_tx_dma)
165	dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
166	return -ENOMEM;
167	}
38455d7a	168	EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs);
e8beacbb AL	169
	170	void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
	171	{
	172	struct device *dev = mspi->dev;
	173	struct spi_transfer *t = mspi->xfer_in_progress;
	174
	175	if (mspi->map_tx_dma)
	176	dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
	177	if (mspi->map_rx_dma)
	178	dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
	179	mspi->xfer_in_progress = NULL;
	180	}
38455d7a	181	EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete);
e8beacbb AL	182
	183	void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
	184	{
	185	u16 len;
	186	struct fsl_spi_reg *reg_base = mspi->reg_base;
	187
	188	dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
	189	in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
	190
	191	len = in_be16(&mspi->rx_bd->cbd_datlen);
	192	if (len > mspi->count) {
	193	WARN_ON(1);
	194	len = mspi->count;
	195	}
	196
	197	/* Clear the events */
	198	mpc8xxx_spi_write_reg(&reg_base->event, events);
	199
	200	mspi->count -= len;
	201	if (mspi->count)
	202	fsl_spi_cpm_bufs_start(mspi);
	203	else
	204	complete(&mspi->done);
	205	}
38455d7a	206	EXPORT_SYMBOL_GPL(fsl_spi_cpm_irq);
e8beacbb AL	207
	208	static void *fsl_spi_alloc_dummy_rx(void)
	209	{
	210	mutex_lock(&fsl_dummy_rx_lock);
	211
	212	if (!fsl_dummy_rx)
	213	fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
	214	if (fsl_dummy_rx)
	215	fsl_dummy_rx_refcnt++;
	216
	217	mutex_unlock(&fsl_dummy_rx_lock);
	218
	219	return fsl_dummy_rx;
	220	}
	221
	222	static void fsl_spi_free_dummy_rx(void)
	223	{
	224	mutex_lock(&fsl_dummy_rx_lock);
	225
	226	switch (fsl_dummy_rx_refcnt) {
	227	case 0:
	228	WARN_ON(1);
	229	break;
	230	case 1:
	231	kfree(fsl_dummy_rx);
	232	fsl_dummy_rx = NULL;
	233	/* fall through */
	234	default:
	235	fsl_dummy_rx_refcnt--;
	236	break;
	237	}
	238
	239	mutex_unlock(&fsl_dummy_rx_lock);
	240	}
	241
	242	static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
	243	{
	244	struct device *dev = mspi->dev;
	245	struct device_node *np = dev->of_node;
	246	const u32 *iprop;
	247	int size;
	248	void __iomem *spi_base;
	249	unsigned long pram_ofs = -ENOMEM;
	250
	251	/* Can't use of_address_to_resource(), QE muram isn't at 0. */
	252	iprop = of_get_property(np, "reg", &size);
	253
	254	/* QE with a fixed pram location? */
	255	if (mspi->flags & SPI_QE && iprop && size == sizeof(iprop) 4)
	256	return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
	257
	258	/* QE but with a dynamic pram location? */
	259	if (mspi->flags & SPI_QE) {
	260	pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
	261	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
	262	QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
	263	return pram_ofs;
	264	}
	265
	266	spi_base = of_iomap(np, 1);
	267	if (spi_base == NULL)
	268	return -EINVAL;
	269
	270	if (mspi->flags & SPI_CPM2) {
271	pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
272	out_be16(spi_base, pram_ofs);
e8beacbb AL	273	}
	274
	275	iounmap(spi_base);
	276	return pram_ofs;
	277	}
	278
	279	int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
	280	{
	281	struct device *dev = mspi->dev;
	282	struct device_node *np = dev->of_node;
	283	const u32 *iprop;
	284	int size;
e8beacbb AL	285	unsigned long bds_ofs;
	286
	287	if (!(mspi->flags & SPI_CPM_MODE))
	288	return 0;
	289
	290	if (!fsl_spi_alloc_dummy_rx())
	291	return -ENOMEM;
	292
	293	if (mspi->flags & SPI_QE) {
	294	iprop = of_get_property(np, "cell-index", &size);
	295	if (iprop && size == sizeof(*iprop))
	296	mspi->subblock = *iprop;
	297
	298	switch (mspi->subblock) {
	299	default:
a1829d2b	300	dev_warn(dev, "cell-index unspecified, assuming SPI1\n");
e8beacbb AL	301	/* fall through */
	302	case 0:
	303	mspi->subblock = QE_CR_SUBBLOCK_SPI1;
	304	break;
	305	case 1:
	306	mspi->subblock = QE_CR_SUBBLOCK_SPI2;
	307	break;
	308	}
	309	}
	310
575bec53 CL	311	if (mspi->flags & SPI_CPM1) {
575bec53 CL	312	struct resource *res;
73ee39a4	313	void *pram;
575bec53 CL	314
	315	res = platform_get_resource(to_platform_device(dev),
	316	IORESOURCE_MEM, 1);
73ee39a4 CL	317	pram = devm_ioremap_resource(dev, res);
	318	if (IS_ERR(pram))
	319	mspi->pram = NULL;
	320	else
	321	mspi->pram = pram;
575bec53 CL	322	} else {
	323	unsigned long pram_ofs = fsl_spi_cpm_get_pram(mspi);
	324
	325	if (IS_ERR_VALUE(pram_ofs))
	326	mspi->pram = NULL;
	327	else
	328	mspi->pram = cpm_muram_addr(pram_ofs);
	329	}
	330	if (mspi->pram == NULL) {
e8beacbb AL	331	dev_err(dev, "can't allocate spi parameter ram\n");
	332	goto err_pram;
	333	}
	334
	335	bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
	336	sizeof(*mspi->rx_bd), 8);
	337	if (IS_ERR_VALUE(bds_ofs)) {
	338	dev_err(dev, "can't allocate bds\n");
	339	goto err_bds;
	340	}
	341
	342	mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
	343	DMA_TO_DEVICE);
	344	if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
	345	dev_err(dev, "unable to map dummy tx buffer\n");
	346	goto err_dummy_tx;
	347	}
	348
	349	mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
	350	DMA_FROM_DEVICE);
	351	if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
	352	dev_err(dev, "unable to map dummy rx buffer\n");
	353	goto err_dummy_rx;
	354	}
	355
e8beacbb AL	356	mspi->tx_bd = cpm_muram_addr(bds_ofs);
	357	mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
	358
	359	/* Initialize parameter ram. */
	360	out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
	361	out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
	362	out_8(&mspi->pram->tfcr, CPMFCR_EB \| CPMFCR_GBL);
	363	out_8(&mspi->pram->rfcr, CPMFCR_EB \| CPMFCR_GBL);
	364	out_be16(&mspi->pram->mrblr, SPI_MRBLR);
	365	out_be32(&mspi->pram->rstate, 0);
	366	out_be32(&mspi->pram->rdp, 0);
	367	out_be16(&mspi->pram->rbptr, 0);
	368	out_be16(&mspi->pram->rbc, 0);
	369	out_be32(&mspi->pram->rxtmp, 0);
	370	out_be32(&mspi->pram->tstate, 0);
	371	out_be32(&mspi->pram->tdp, 0);
	372	out_be16(&mspi->pram->tbptr, 0);
	373	out_be16(&mspi->pram->tbc, 0);
	374	out_be32(&mspi->pram->txtmp, 0);
	375
	376	return 0;
	377
	378	err_dummy_rx:
	379	dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
	380	err_dummy_tx:
	381	cpm_muram_free(bds_ofs);
	382	err_bds:
575bec53 CL	383	if (!(mspi->flags & SPI_CPM1))
575bec53 CL	384	cpm_muram_free(cpm_muram_offset(mspi->pram));
e8beacbb AL	385	err_pram:
	386	fsl_spi_free_dummy_rx();
	387	return -ENOMEM;
	388	}
38455d7a	389	EXPORT_SYMBOL_GPL(fsl_spi_cpm_init);
e8beacbb AL	390
	391	void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
	392	{
	393	struct device *dev = mspi->dev;
	394
	395	if (!(mspi->flags & SPI_CPM_MODE))
	396	return;
	397
	398	dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
	399	dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
	400	cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
	401	cpm_muram_free(cpm_muram_offset(mspi->pram));
	402	fsl_spi_free_dummy_rx();
	403	}
38455d7a EH	404	EXPORT_SYMBOL_GPL(fsl_spi_cpm_free);
	405
	406	MODULE_LICENSE("GPL");