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, 429 deletions

diff --git a/drivers/spi/spi_gpio.c b/drivers/spi/spi_gpio.c
deleted file mode 100644
index 63e51b011d5..00000000000
--- a/drivers/spi/spi_gpio.c
+++ /dev/null
@@ -1,429 +0,0 @@
-/*
- * spi_gpio.c - SPI master driver using generic bitbanged GPIO
- *
- * Copyright (C) 2006,2008 David Brownell
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-
-#include <linux/spi/spi.h>
-#include <linux/spi/spi_bitbang.h>
-#include <linux/spi/spi_gpio.h>
-
-
-/*
- * This bitbanging SPI master driver should help make systems usable
- * when a native hardware SPI engine is not available, perhaps because
- * its driver isn't yet working or because the I/O pins it requires
- * are used for other purposes.
- *
- * platform_device->driver_data ... points to spi_gpio
- *
- * spi->controller_state ... reserved for bitbang framework code
- * spi->controller_data ... holds chipselect GPIO
- *
- * spi->master->dev.driver_data ... points to spi_gpio->bitbang
- */
-
-struct spi_gpio {
-	struct spi_bitbang		bitbang;
-	struct spi_gpio_platform_data	pdata;
-	struct platform_device		*pdev;
-};
-
-/*----------------------------------------------------------------------*/
-
-/*
- * Because the overhead of going through four GPIO procedure calls
- * per transferred bit can make performance a problem, this code
- * is set up so that you can use it in either of two ways:
- *
- *   - The slow generic way:  set up platform_data to hold the GPIO
- *     numbers used for MISO/MOSI/SCK, and issue procedure calls for
- *     each of them.  This driver can handle several such busses.
- *
- *   - The quicker inlined way:  only helps with platform GPIO code
- *     that inlines operations for constant GPIOs.  This can give
- *     you tight (fast!) inner loops, but each such bus needs a
- *     new driver.  You'll define a new C file, with Makefile and
- *     Kconfig support; the C code can be a total of six lines:
- *
- *		#define DRIVER_NAME	"myboard_spi2"
- *		#define	SPI_MISO_GPIO	119
- *		#define	SPI_MOSI_GPIO	120
- *		#define	SPI_SCK_GPIO	121
- *		#define	SPI_N_CHIPSEL	4
- *		#include "spi_gpio.c"
- */
-
-#ifndef DRIVER_NAME
-#define DRIVER_NAME	"spi_gpio"
-
-#define GENERIC_BITBANG	/* vs tight inlines */
-
-/* all functions referencing these symbols must define pdata */
-#define SPI_MISO_GPIO	((pdata)->miso)
-#define SPI_MOSI_GPIO	((pdata)->mosi)
-#define SPI_SCK_GPIO	((pdata)->sck)
-
-#define SPI_N_CHIPSEL	((pdata)->num_chipselect)
-
-#endif
-
-/*----------------------------------------------------------------------*/
-
-static inline const struct spi_gpio_platform_data * __pure
-spi_to_pdata(const struct spi_device *spi)
-{
-	const struct spi_bitbang	*bang;
-	const struct spi_gpio		*spi_gpio;
-
-	bang = spi_master_get_devdata(spi->master);
-	spi_gpio = container_of(bang, struct spi_gpio, bitbang);
-	return &spi_gpio->pdata;
-}
-
-/* this is #defined to avoid unused-variable warnings when inlining */
-#define pdata		spi_to_pdata(spi)
-
-static inline void setsck(const struct spi_device *spi, int is_on)
-{
-	gpio_set_value(SPI_SCK_GPIO, is_on);
-}
-
-static inline void setmosi(const struct spi_device *spi, int is_on)
-{
-	gpio_set_value(SPI_MOSI_GPIO, is_on);
-}
-
-static inline int getmiso(const struct spi_device *spi)
-{
-	return !!gpio_get_value(SPI_MISO_GPIO);
-}
-
-#undef pdata
-
-/*
- * NOTE:  this clocks "as fast as we can".  It "should" be a function of the
- * requested device clock.  Software overhead means we usually have trouble
- * reaching even one Mbit/sec (except when we can inline bitops), so for now
- * we'll just assume we never need additional per-bit slowdowns.
- */
-#define spidelay(nsecs)	do {} while (0)
-
-#include "spi_bitbang_txrx.h"
-
-/*
- * These functions can leverage inline expansion of GPIO calls to shrink
- * costs for a txrx bit, often by factors of around ten (by instruction
- * count).  That is particularly visible for larger word sizes, but helps
- * even with default 8-bit words.
- *
- * REVISIT overheads calling these functions for each word also have
- * significant performance costs.  Having txrx_bufs() calls that inline
- * the txrx_word() logic would help performance, e.g. on larger blocks
- * used with flash storage or MMC/SD.  There should also be ways to make
- * GCC be less stupid about reloading registers inside the I/O loops,
- * even without inlined GPIO calls; __attribute__((hot)) on GCC 4.3?
- */
-
-static u32 spi_gpio_txrx_word_mode0(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	return bitbang_txrx_be_cpha0(spi, nsecs, 0, 0, word, bits);
-}
-
-static u32 spi_gpio_txrx_word_mode1(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	return bitbang_txrx_be_cpha1(spi, nsecs, 0, 0, word, bits);
-}
-
-static u32 spi_gpio_txrx_word_mode2(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	return bitbang_txrx_be_cpha0(spi, nsecs, 1, 0, word, bits);
-}
-
-static u32 spi_gpio_txrx_word_mode3(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	return bitbang_txrx_be_cpha1(spi, nsecs, 1, 0, word, bits);
-}
-
-/*
- * These functions do not call setmosi or getmiso if respective flag
- * (SPI_MASTER_NO_RX or SPI_MASTER_NO_TX) is set, so they are safe to
- * call when such pin is not present or defined in the controller.
- * A separate set of callbacks is defined to get highest possible
- * speed in the generic case (when both MISO and MOSI lines are
- * available), as optimiser will remove the checks when argument is
- * constant.
- */
-
-static u32 spi_gpio_spec_txrx_word_mode0(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	unsigned flags = spi->master->flags;
-	return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
-}
-
-static u32 spi_gpio_spec_txrx_word_mode1(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	unsigned flags = spi->master->flags;
-	return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
-}
-
-static u32 spi_gpio_spec_txrx_word_mode2(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	unsigned flags = spi->master->flags;
-	return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
-}
-
-static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
-		unsigned nsecs, u32 word, u8 bits)
-{
-	unsigned flags = spi->master->flags;
-	return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
-}
-
-/*----------------------------------------------------------------------*/
-
-static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
-{
-	unsigned long cs = (unsigned long) spi->controller_data;
-
-	/* set initial clock polarity */
-	if (is_active)
-		setsck(spi, spi->mode & SPI_CPOL);
-
-	if (cs != SPI_GPIO_NO_CHIPSELECT) {
-		/* SPI is normally active-low */
-		gpio_set_value(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active);
-	}
-}
-
-static int spi_gpio_setup(struct spi_device *spi)
-{
-	unsigned long	cs = (unsigned long) spi->controller_data;
-	int		status = 0;
-
-	if (spi->bits_per_word > 32)
-		return -EINVAL;
-
-	if (!spi->controller_state) {
-		if (cs != SPI_GPIO_NO_CHIPSELECT) {
-			status = gpio_request(cs, dev_name(&spi->dev));
-			if (status)
-				return status;
-			status = gpio_direction_output(cs, spi->mode & SPI_CS_HIGH);
-		}
-	}
-	if (!status)
-		status = spi_bitbang_setup(spi);
-	if (status) {
-		if (!spi->controller_state && cs != SPI_GPIO_NO_CHIPSELECT)
-			gpio_free(cs);
-	}
-	return status;
-}
-
-static void spi_gpio_cleanup(struct spi_device *spi)
-{
-	unsigned long	cs = (unsigned long) spi->controller_data;
-
-	if (cs != SPI_GPIO_NO_CHIPSELECT)
-		gpio_free(cs);
-	spi_bitbang_cleanup(spi);
-}
-
-static int __init spi_gpio_alloc(unsigned pin, const char *label, bool is_in)
-{
-	int value;
-
-	value = gpio_request(pin, label);
-	if (value == 0) {
-		if (is_in)
-			value = gpio_direction_input(pin);
-		else
-			value = gpio_direction_output(pin, 0);
-	}
-	return value;
-}
-
-static int __init
-spi_gpio_request(struct spi_gpio_platform_data *pdata, const char *label,
-	u16 *res_flags)
-{
-	int value;
-
-	/* NOTE:  SPI_*_GPIO symbols may reference "pdata" */
-
-	if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI) {
-		value = spi_gpio_alloc(SPI_MOSI_GPIO, label, false);
-		if (value)
-			goto done;
-	} else {
-		/* HW configuration without MOSI pin */
-		*res_flags |= SPI_MASTER_NO_TX;
-	}
-
-	if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO) {
-		value = spi_gpio_alloc(SPI_MISO_GPIO, label, true);
-		if (value)
-			goto free_mosi;
-	} else {
-		/* HW configuration without MISO pin */
-		*res_flags |= SPI_MASTER_NO_RX;
-	}
-
-	value = spi_gpio_alloc(SPI_SCK_GPIO, label, false);
-	if (value)
-		goto free_miso;
-
-	goto done;
-
-free_miso:
-	if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-		gpio_free(SPI_MISO_GPIO);
-free_mosi:
-	if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-		gpio_free(SPI_MOSI_GPIO);
-done:
-	return value;
-}
-
-static int __init spi_gpio_probe(struct platform_device *pdev)
-{
-	int				status;
-	struct spi_master		*master;
-	struct spi_gpio			*spi_gpio;
-	struct spi_gpio_platform_data	*pdata;
-	u16 master_flags = 0;
-
-	pdata = pdev->dev.platform_data;
-#ifdef GENERIC_BITBANG
-	if (!pdata || !pdata->num_chipselect)
-		return -ENODEV;
-#endif
-
-	status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags);
-	if (status < 0)
-		return status;
-
-	master = spi_alloc_master(&pdev->dev, sizeof *spi_gpio);
-	if (!master) {
-		status = -ENOMEM;
-		goto gpio_free;
-	}
-	spi_gpio = spi_master_get_devdata(master);
-	platform_set_drvdata(pdev, spi_gpio);
-
-	spi_gpio->pdev = pdev;
-	if (pdata)
-		spi_gpio->pdata = *pdata;
-
-	master->flags = master_flags;
-	master->bus_num = pdev->id;
-	master->num_chipselect = SPI_N_CHIPSEL;
-	master->setup = spi_gpio_setup;
-	master->cleanup = spi_gpio_cleanup;
-
-	spi_gpio->bitbang.master = spi_master_get(master);
-	spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
-
-	if ((master_flags & (SPI_MASTER_NO_TX | SPI_MASTER_NO_RX)) == 0) {
-		spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_word_mode1;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_word_mode2;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_word_mode3;
-	} else {
-		spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_spec_txrx_word_mode0;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_spec_txrx_word_mode1;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_spec_txrx_word_mode2;
-		spi_gpio->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_spec_txrx_word_mode3;
-	}
-	spi_gpio->bitbang.setup_transfer = spi_bitbang_setup_transfer;
-	spi_gpio->bitbang.flags = SPI_CS_HIGH;
-
-	status = spi_bitbang_start(&spi_gpio->bitbang);
-	if (status < 0) {
-		spi_master_put(spi_gpio->bitbang.master);
-gpio_free:
-		if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-			gpio_free(SPI_MISO_GPIO);
-		if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-			gpio_free(SPI_MOSI_GPIO);
-		gpio_free(SPI_SCK_GPIO);
-		spi_master_put(master);
-	}
-
-	return status;
-}
-
-static int __exit spi_gpio_remove(struct platform_device *pdev)
-{
-	struct spi_gpio			*spi_gpio;
-	struct spi_gpio_platform_data	*pdata;
-	int				status;
-
-	spi_gpio = platform_get_drvdata(pdev);
-	pdata = pdev->dev.platform_data;
-
-	/* stop() unregisters child devices too */
-	status = spi_bitbang_stop(&spi_gpio->bitbang);
-	spi_master_put(spi_gpio->bitbang.master);
-
-	platform_set_drvdata(pdev, NULL);
-
-	if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-		gpio_free(SPI_MISO_GPIO);
-	if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-		gpio_free(SPI_MOSI_GPIO);
-	gpio_free(SPI_SCK_GPIO);
-
-	return status;
-}
-
-MODULE_ALIAS("platform:" DRIVER_NAME);
-
-static struct platform_driver spi_gpio_driver = {
-	.driver.name	= DRIVER_NAME,
-	.driver.owner	= THIS_MODULE,
-	.remove		= __exit_p(spi_gpio_remove),
-};
-
-static int __init spi_gpio_init(void)
-{
-	return platform_driver_probe(&spi_gpio_driver, spi_gpio_probe);
-}
-module_init(spi_gpio_init);
-
-static void __exit spi_gpio_exit(void)
-{
-	platform_driver_unregister(&spi_gpio_driver);
-}
-module_exit(spi_gpio_exit);
-
-
-MODULE_DESCRIPTION("SPI master driver using generic bitbanged GPIO ");
-MODULE_AUTHOR("David Brownell");
-MODULE_LICENSE("GPL");