[linux.git] / drivers / spi / spi-fsl-lib.c

/*
 * Freescale SPI/eSPI controller driver library.
 *
 * Maintainer: Kumar Gala
 *
 * Copyright (C) 2006 Polycom, Inc.
 *
 * CPM SPI and QE buffer descriptors mode support:
 * Copyright (c) 2009  MontaVista Software, Inc.
 * Author: Anton Vorontsov <[email protected]>
 *
 * Copyright 2010 Freescale Semiconductor, Inc.
 *
 * 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/dma-mapping.h>
#include <linux/fsl_devices.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/spi/spi.h>
#ifdef CONFIG_FSL_SOC
#include <sysdev/fsl_soc.h>
#endif

#include "spi-fsl-lib.h"

#define MPC8XXX_SPI_RX_BUF(type) 					  \
void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
{									  \
	type *rx = mpc8xxx_spi->rx;					  \
	*rx++ = (type)(data >> mpc8xxx_spi->rx_shift);			  \
	mpc8xxx_spi->rx = rx;						  \
}									  \
EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);

#define MPC8XXX_SPI_TX_BUF(type)				\
u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi)	\
{								\
	u32 data;						\
	const type *tx = mpc8xxx_spi->tx;			\
	if (!tx)						\
		return 0;					\
	data = *tx++ << mpc8xxx_spi->tx_shift;			\
	mpc8xxx_spi->tx = tx;					\
	return data;						\
}								\
EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);

MPC8XXX_SPI_RX_BUF(u8)
MPC8XXX_SPI_RX_BUF(u16)
MPC8XXX_SPI_RX_BUF(u32)
MPC8XXX_SPI_TX_BUF(u8)
MPC8XXX_SPI_TX_BUF(u16)
MPC8XXX_SPI_TX_BUF(u32)

struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
{
	return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
}
EXPORT_SYMBOL_GPL(to_of_pinfo);

const char *mpc8xxx_spi_strmode(unsigned int flags)
{
	if (flags & SPI_QE_CPU_MODE) {
		return "QE CPU";
	} else if (flags & SPI_CPM_MODE) {
		if (flags & SPI_QE)
			return "QE";
		else if (flags & SPI_CPM2)
			return "CPM2";
		else
			return "CPM1";
	}
	return "CPU";
}
EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);

void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
			unsigned int irq)
{
	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
	struct spi_master *master;
	struct mpc8xxx_spi *mpc8xxx_spi;

	master = dev_get_drvdata(dev);

	/* the spi->mode bits understood by this driver: */
	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
			| SPI_LSB_FIRST | SPI_LOOP;

	master->dev.of_node = dev->of_node;

	mpc8xxx_spi = spi_master_get_devdata(master);
	mpc8xxx_spi->dev = dev;
	mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
	mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
	mpc8xxx_spi->flags = pdata->flags;
	mpc8xxx_spi->spibrg = pdata->sysclk;
	mpc8xxx_spi->irq = irq;

	mpc8xxx_spi->rx_shift = 0;
	mpc8xxx_spi->tx_shift = 0;

	master->bus_num = pdata->bus_num;
	master->num_chipselect = pdata->max_chipselect;

	init_completion(&mpc8xxx_spi->done);
}
EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);

int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
{
	struct device *dev = &ofdev->dev;
	struct device_node *np = ofdev->dev.of_node;
	struct mpc8xxx_spi_probe_info *pinfo;
	struct fsl_spi_platform_data *pdata;
	const void *prop;
	int ret = -ENOMEM;

	pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
	if (!pinfo)
		return ret;

	pdata = &pinfo->pdata;
	dev->platform_data = pdata;

	/* Allocate bus num dynamically. */
	pdata->bus_num = -1;

#ifdef CONFIG_FSL_SOC
	/* SPI controller is either clocked from QE or SoC clock. */
	pdata->sysclk = get_brgfreq();
	if (pdata->sysclk == -1) {
		pdata->sysclk = fsl_get_sys_freq();
		if (pdata->sysclk == -1)
			return -ENODEV;
	}
#else
	ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
	if (ret)
		return ret;
#endif

	prop = of_get_property(np, "mode", NULL);
	if (prop && !strcmp(prop, "cpu-qe"))
		pdata->flags = SPI_QE_CPU_MODE;
	else if (prop && !strcmp(prop, "qe"))
		pdata->flags = SPI_CPM_MODE | SPI_QE;
	else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
		pdata->flags = SPI_CPM_MODE | SPI_CPM2;
	else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
		pdata->flags = SPI_CPM_MODE | SPI_CPM1;

	return 0;
}
EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);

MODULE_LICENSE("GPL");
Commit	Line	Data
b36ece83 MH	1	/*
	2	* Freescale SPI/eSPI controller driver library.
	3	*
	4	* Maintainer: Kumar Gala
	5	*
	6	* Copyright (C) 2006 Polycom, Inc.
	7	*
	8	* CPM SPI and QE buffer descriptors mode support:
	9	* Copyright (c) 2009 MontaVista Software, Inc.
	10	* Author: Anton Vorontsov <[email protected]>
	11	*
	12	* Copyright 2010 Freescale Semiconductor, Inc.
	13	*
	14	* This program is free software; you can redistribute it and/or modify it
	15	* under the terms of the GNU General Public License as published by the
	16	* Free Software Foundation; either version 2 of the License, or (at your
	17	* option) any later version.
	18	*/
b36ece83	19	#include <linux/dma-mapping.h>
a3108360 XL	20	#include <linux/fsl_devices.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/kernel.h>
b36ece83	23	#include <linux/mm.h>
38455d7a	24	#include <linux/module.h>
b36ece83	25	#include <linux/of_platform.h>
d57a4282	26	#include <linux/spi/spi.h>
e8beacbb	27	#ifdef CONFIG_FSL_SOC
b36ece83	28	#include <sysdev/fsl_soc.h>
e8beacbb	29	#endif
b36ece83	30
ca632f55	31	#include "spi-fsl-lib.h"
b36ece83 MH	32
	33	#define MPC8XXX_SPI_RX_BUF(type) \
	34	void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
	35	{ \
	36	type *rx = mpc8xxx_spi->rx; \
	37	*rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \
	38	mpc8xxx_spi->rx = rx; \
38455d7a EH	39	} \
38455d7a EH	40	EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);
b36ece83 MH	41
	42	#define MPC8XXX_SPI_TX_BUF(type) \
	43	u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \
	44	{ \
	45	u32 data; \
	46	const type *tx = mpc8xxx_spi->tx; \
	47	if (!tx) \
	48	return 0; \
	49	data = *tx++ << mpc8xxx_spi->tx_shift; \
	50	mpc8xxx_spi->tx = tx; \
	51	return data; \
38455d7a EH	52	} \
38455d7a EH	53	EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);
b36ece83 MH	54
	55	MPC8XXX_SPI_RX_BUF(u8)
	56	MPC8XXX_SPI_RX_BUF(u16)
	57	MPC8XXX_SPI_RX_BUF(u32)
	58	MPC8XXX_SPI_TX_BUF(u8)
	59	MPC8XXX_SPI_TX_BUF(u16)
	60	MPC8XXX_SPI_TX_BUF(u32)
	61
	62	struct mpc8xxx_spi_probe_info to_of_pinfo(struct fsl_spi_platform_data pdata)
	63	{
	64	return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
	65	}
38455d7a	66	EXPORT_SYMBOL_GPL(to_of_pinfo);
b36ece83	67
b36ece83 MH	68	const char *mpc8xxx_spi_strmode(unsigned int flags)
	69	{
	70	if (flags & SPI_QE_CPU_MODE) {
	71	return "QE CPU";
	72	} else if (flags & SPI_CPM_MODE) {
	73	if (flags & SPI_QE)
	74	return "QE";
	75	else if (flags & SPI_CPM2)
	76	return "CPM2";
	77	else
	78	return "CPM1";
	79	}
	80	return "CPU";
	81	}
38455d7a	82	EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);
b36ece83	83
c592becb	84	void mpc8xxx_spi_probe(struct device dev, struct resource mem,
b36ece83 MH	85	unsigned int irq)
b36ece83 MH	86	{
8074cf06	87	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
b36ece83 MH	88	struct spi_master *master;
b36ece83 MH	89	struct mpc8xxx_spi *mpc8xxx_spi;
b36ece83 MH	90
	91	master = dev_get_drvdata(dev);
	92
	93	/* the spi->mode bits understood by this driver: */
	94	master->mode_bits = SPI_CPOL \| SPI_CPHA \| SPI_CS_HIGH
	95	\| SPI_LSB_FIRST \| SPI_LOOP;
	96
b36ece83 MH	97	master->dev.of_node = dev->of_node;
	98
	99	mpc8xxx_spi = spi_master_get_devdata(master);
	100	mpc8xxx_spi->dev = dev;
	101	mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
	102	mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
	103	mpc8xxx_spi->flags = pdata->flags;
	104	mpc8xxx_spi->spibrg = pdata->sysclk;
	105	mpc8xxx_spi->irq = irq;
	106
	107	mpc8xxx_spi->rx_shift = 0;
	108	mpc8xxx_spi->tx_shift = 0;
	109
b36ece83 MH	110	master->bus_num = pdata->bus_num;
	111	master->num_chipselect = pdata->max_chipselect;
	112
b36ece83	113	init_completion(&mpc8xxx_spi->done);
b36ece83	114	}
38455d7a	115	EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
b36ece83	116
fd4a319b	117	int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
b36ece83 MH	118	{
	119	struct device *dev = &ofdev->dev;
	120	struct device_node *np = ofdev->dev.of_node;
	121	struct mpc8xxx_spi_probe_info *pinfo;
	122	struct fsl_spi_platform_data *pdata;
	123	const void *prop;
	124	int ret = -ENOMEM;
	125
7282326b	126	pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
b36ece83	127	if (!pinfo)
ef4bbdec	128	return ret;
b36ece83 MH	129
	130	pdata = &pinfo->pdata;
	131	dev->platform_data = pdata;
	132
	133	/* Allocate bus num dynamically. */
	134	pdata->bus_num = -1;
	135
e8beacbb	136	#ifdef CONFIG_FSL_SOC
b36ece83 MH	137	/* SPI controller is either clocked from QE or SoC clock. */
	138	pdata->sysclk = get_brgfreq();
	139	if (pdata->sysclk == -1) {
	140	pdata->sysclk = fsl_get_sys_freq();
7282326b AL	141	if (pdata->sysclk == -1)
7282326b AL	142	return -ENODEV;
b36ece83	143	}
e8beacbb AL	144	#else
	145	ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
	146	if (ret)
7282326b	147	return ret;
e8beacbb	148	#endif
b36ece83 MH	149
	150	prop = of_get_property(np, "mode", NULL);
	151	if (prop && !strcmp(prop, "cpu-qe"))
	152	pdata->flags = SPI_QE_CPU_MODE;
	153	else if (prop && !strcmp(prop, "qe"))
	154	pdata->flags = SPI_CPM_MODE \| SPI_QE;
	155	else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
	156	pdata->flags = SPI_CPM_MODE \| SPI_CPM2;
	157	else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
	158	pdata->flags = SPI_CPM_MODE \| SPI_CPM1;
	159
	160	return 0;
b36ece83	161	}
38455d7a EH	162	EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);
	163
	164	MODULE_LICENSE("GPL");