diff options
Diffstat (limited to 'target/linux/ubicom32/files/drivers/spi/spi_ubicom32_gpio.c')
| -rw-r--r-- | target/linux/ubicom32/files/drivers/spi/spi_ubicom32_gpio.c | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/target/linux/ubicom32/files/drivers/spi/spi_ubicom32_gpio.c b/target/linux/ubicom32/files/drivers/spi/spi_ubicom32_gpio.c deleted file mode 100644 index c41018a26d..0000000000 --- a/target/linux/ubicom32/files/drivers/spi/spi_ubicom32_gpio.c +++ /dev/null @@ -1,267 +0,0 @@ -/* - * drivers/spi_spi_ubicom32_gpio.c - * Ubicom32 GPIO based SPI driver - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port 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. - * - * The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/spinlock.h> -#include <linux/workqueue.h> -#include <linux/platform_device.h> - -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> - -#include <linux/gpio.h> - -#include <asm/ubicom32-spi-gpio.h> - -#define DRIVER_NAME "ubicom32-spi-gpio" - -struct ubicom32_spi_gpio { - struct spi_bitbang bitbang; - - struct ubicom32_spi_gpio_platform_data *pdata; - - struct platform_device *dev; -}; - -/* - * The following 4 functions are used by EXPAND_BITBANG_TXRX to bitbang the data out. - */ -static inline void setsck(struct spi_device *dev, int on) -{ - struct ubicom32_spi_gpio *usg = (struct ubicom32_spi_gpio *)spi_master_get_devdata(dev->master); - gpio_set_value(usg->pdata->pin_clk, on ? 1 : 0); -} - -static inline void setmosi(struct spi_device *dev, int on) -{ - struct ubicom32_spi_gpio *usg = (struct ubicom32_spi_gpio *)spi_master_get_devdata(dev->master); - gpio_set_value(usg->pdata->pin_mosi, on ? 1 : 0); -} - -static inline u32 getmiso(struct spi_device *dev) -{ - struct ubicom32_spi_gpio *usg = (struct ubicom32_spi_gpio *)spi_master_get_devdata(dev->master); - return gpio_get_value(usg->pdata->pin_miso) ? 1 : 0; -} - -#define spidelay(x) ndelay(x) - -#define EXPAND_BITBANG_TXRX -#include <linux/spi/spi_bitbang.h> - -/* - * ubicom32_spi_gpio_txrx_mode0 - */ -static u32 ubicom32_spi_gpio_txrx_mode0(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits) -{ - return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits); -} - -/* - * ubicom32_spi_gpio_txrx_mode1 - */ -static u32 ubicom32_spi_gpio_txrx_mode1(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits) -{ - return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits); -} - -/* - * ubicom32_spi_gpio_txrx_mode2 - */ -static u32 ubicom32_spi_gpio_txrx_mode2(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits) -{ - return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits); -} - -/* - * ubicom32_spi_gpio_txrx_mode3 - */ -static u32 ubicom32_spi_gpio_txrx_mode3(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits) -{ - return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits); -} - -/* - * ubicom32_spi_gpio_chipselect - */ -static void ubicom32_spi_gpio_chipselect(struct spi_device *dev, int value) -{ - struct ubicom32_spi_gpio_controller_data *cd = (struct ubicom32_spi_gpio_controller_data *)dev->controller_data; - unsigned int cs_polarity = dev->mode & SPI_CS_HIGH ? 1 : 0; - - if (value == BITBANG_CS_ACTIVE) { - gpio_set_value(cd->pin_cs, cs_polarity); - return; - } - gpio_set_value(cd->pin_cs, !cs_polarity); -} - -/* - * ubicom32_spi_gpio_probe - */ -static int ubicom32_spi_gpio_probe(struct platform_device *dev) -{ - struct ubicom32_spi_gpio_platform_data *pdata; - struct spi_master *master; - struct ubicom32_spi_gpio *usg; - int ret; - - master = spi_alloc_master(&dev->dev, sizeof(struct ubicom32_spi_gpio)); - if (master == NULL) { - dev_err(&dev->dev, "failed to allocate spi master\n"); - ret = -ENOMEM; - goto err; - } - - usg = (struct ubicom32_spi_gpio *)spi_master_get_devdata(master); - - platform_set_drvdata(dev, usg); - - /* - * Copy in the platform data - */ - pdata = dev->dev.platform_data; - usg->pdata = dev->dev.platform_data; - - /* - * Request the GPIO lines - */ - ret = gpio_request(pdata->pin_mosi, "spi-mosi"); - if (ret) { - dev_err(&dev->dev, "Failed to allocate spi-mosi GPIO\n"); - goto err; - } - - ret = gpio_request(pdata->pin_miso, "spi-miso"); - if (ret) { - dev_err(&dev->dev, "Failed to allocate spi-miso GPIO\n"); - goto err_nomiso; - } - - ret = gpio_request(pdata->pin_clk, "spi-clk"); - if (ret) { - dev_err(&dev->dev, "Failed to allocate spi-clk GPIO\n"); - goto err_noclk; - } - - /* - * Setup spi-bitbang adaptor - */ - usg->bitbang.flags |= SPI_CS_HIGH; - usg->bitbang.master = spi_master_get(master); - usg->bitbang.master->bus_num = pdata->bus_num; - usg->bitbang.master->num_chipselect = pdata->num_chipselect; - usg->bitbang.chipselect = ubicom32_spi_gpio_chipselect; - - usg->bitbang.txrx_word[SPI_MODE_0] = ubicom32_spi_gpio_txrx_mode0; - usg->bitbang.txrx_word[SPI_MODE_1] = ubicom32_spi_gpio_txrx_mode1; - usg->bitbang.txrx_word[SPI_MODE_2] = ubicom32_spi_gpio_txrx_mode2; - usg->bitbang.txrx_word[SPI_MODE_3] = ubicom32_spi_gpio_txrx_mode3; - - /* - * Setup the GPIO pins - */ - gpio_direction_output(pdata->pin_clk, pdata->clk_default); - gpio_direction_output(pdata->pin_mosi, 0); - gpio_direction_input(pdata->pin_miso); - - /* - * Ready to go - */ - ret = spi_bitbang_start(&usg->bitbang); - if (ret) { - goto err_no_bitbang; - } - - return 0; - -err_no_bitbang: - spi_master_put(usg->bitbang.master); - - gpio_free(pdata->pin_clk); - -err_noclk: - gpio_free(pdata->pin_miso); - -err_nomiso: - gpio_free(pdata->pin_mosi); - -err: - return ret; -} - -/* - * ubicom32_spi_gpio_remove - */ -static int ubicom32_spi_gpio_remove(struct platform_device *dev) -{ - struct ubicom32_spi_gpio *sp = platform_get_drvdata(dev); - - spi_bitbang_stop(&sp->bitbang); - spi_master_put(sp->bitbang.master); - - return 0; -} - -/* - * Work with hotplug and coldplug - */ -MODULE_ALIAS("platform:ubicom32_spi_gpio"); - -static struct platform_driver ubicom32_spi_gpio_drv = { - .probe = ubicom32_spi_gpio_probe, - .remove = ubicom32_spi_gpio_remove, - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -/* - * ubicom32_spi_gpio_init - */ -static int __init ubicom32_spi_gpio_init(void) -{ - return platform_driver_register(&ubicom32_spi_gpio_drv); -} - -/* - * ubicom32_spi_gpio_exit - */ -static void __exit ubicom32_spi_gpio_exit(void) -{ - platform_driver_unregister(&ubicom32_spi_gpio_drv); -} - -module_init(ubicom32_spi_gpio_init); -module_exit(ubicom32_spi_gpio_exit); - -MODULE_DESCRIPTION("Ubicom32 SPI-GPIO Driver"); -MODULE_AUTHOR("Pat Tjin, <@ubicom.com>"); -MODULE_LICENSE("GPL"); |