+++ /dev/null
-/*
- * SPI driver for the CPLD chip on the Mikrotik RB4xx boards
- *
- * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
- *
- * This file was based on the patches for Linux 2.6.27.39 published by
- * MikroTik for their RouterBoard 4xx series devices.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/bitops.h>
-#include <linux/spi/spi.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/version.h>
-
-#include <asm/mach-ath79/rb4xx_cpld.h>
-
-#define DRV_NAME "spi-rb4xx-cpld"
-#define DRV_DESC "RB4xx CPLD driver"
-#define DRV_VERSION "0.1.0"
-
-#define CPLD_CMD_WRITE_NAND 0x08 /* send cmd, n x send data, send indle */
-#define CPLD_CMD_WRITE_CFG 0x09 /* send cmd, n x send cfg */
-#define CPLD_CMD_READ_NAND 0x0a /* send cmd, send idle, n x read data */
-#define CPLD_CMD_READ_FAST 0x0b /* send cmd, 4 x idle, n x read data */
-#define CPLD_CMD_LED5_ON 0x0c /* send cmd */
-#define CPLD_CMD_LED5_OFF 0x0d /* send cmd */
-
-struct rb4xx_cpld {
- struct spi_device *spi;
- struct mutex lock;
- struct gpio_chip chip;
- unsigned int config;
-};
-
-static struct rb4xx_cpld *rb4xx_cpld;
-
-static inline struct rb4xx_cpld *gpio_to_cpld(struct gpio_chip *chip)
-{
- return container_of(chip, struct rb4xx_cpld, chip);
-}
-
-static int rb4xx_cpld_write_cmd(struct rb4xx_cpld *cpld, unsigned char cmd)
-{
- struct spi_transfer t[1];
- struct spi_message m;
- unsigned char tx_buf[1];
- int err;
-
- spi_message_init(&m);
- memset(&t, 0, sizeof(t));
-
- t[0].tx_buf = tx_buf;
- t[0].len = sizeof(tx_buf);
- spi_message_add_tail(&t[0], &m);
-
- tx_buf[0] = cmd;
-
- err = spi_sync(cpld->spi, &m);
- return err;
-}
-
-static int rb4xx_cpld_write_cfg(struct rb4xx_cpld *cpld, unsigned char config)
-{
- struct spi_transfer t[1];
- struct spi_message m;
- unsigned char cmd[2];
- int err;
-
- spi_message_init(&m);
- memset(&t, 0, sizeof(t));
-
- t[0].tx_buf = cmd;
- t[0].len = sizeof(cmd);
- spi_message_add_tail(&t[0], &m);
-
- cmd[0] = CPLD_CMD_WRITE_CFG;
- cmd[1] = config;
-
- err = spi_sync(cpld->spi, &m);
- return err;
-}
-
-static int __rb4xx_cpld_change_cfg(struct rb4xx_cpld *cpld, unsigned mask,
- unsigned value)
-{
- unsigned int config;
- int err;
-
- config = cpld->config & ~mask;
- config |= value;
-
- if ((cpld->config ^ config) & 0xff) {
- err = rb4xx_cpld_write_cfg(cpld, config);
- if (err)
- return err;
- }
-
- if ((cpld->config ^ config) & CPLD_CFG_nLED5) {
- err = rb4xx_cpld_write_cmd(cpld, (value) ? CPLD_CMD_LED5_ON :
- CPLD_CMD_LED5_OFF);
- if (err)
- return err;
- }
-
- cpld->config = config;
- return 0;
-}
-
-int rb4xx_cpld_change_cfg(unsigned mask, unsigned value)
-{
- int ret;
-
- if (rb4xx_cpld == NULL)
- return -ENODEV;
-
- mutex_lock(&rb4xx_cpld->lock);
- ret = __rb4xx_cpld_change_cfg(rb4xx_cpld, mask, value);
- mutex_unlock(&rb4xx_cpld->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(rb4xx_cpld_change_cfg);
-
-int rb4xx_cpld_read(unsigned char *rx_buf, unsigned count)
-{
- static const unsigned char cmd[2] = { CPLD_CMD_READ_NAND, 0 };
- struct spi_transfer t[2] = {
- {
- .tx_buf = &cmd,
- .len = 2,
- }, {
- .rx_buf = rx_buf,
- .len = count,
- },
- };
- struct spi_message m;
-
- if (rb4xx_cpld == NULL)
- return -ENODEV;
-
- spi_message_init(&m);
- spi_message_add_tail(&t[0], &m);
- spi_message_add_tail(&t[1], &m);
- return spi_sync(rb4xx_cpld->spi, &m);
-}
-EXPORT_SYMBOL_GPL(rb4xx_cpld_read);
-
-int rb4xx_cpld_write(const unsigned char *buf, unsigned count)
-{
- static const unsigned char cmd = CPLD_CMD_WRITE_NAND;
- struct spi_transfer t[3] = {
- {
- .tx_buf = &cmd,
- .len = 1,
- }, {
- .tx_buf = buf,
- .len = count,
- .tx_nbits = SPI_NBITS_DUAL,
- }, {
- .len = 1,
- .tx_nbits = SPI_NBITS_DUAL,
- },
- };
- struct spi_message m;
-
- if (rb4xx_cpld == NULL)
- return -ENODEV;
-
- spi_message_init(&m);
- spi_message_add_tail(&t[0], &m);
- spi_message_add_tail(&t[1], &m);
- spi_message_add_tail(&t[2], &m);
- return spi_sync(rb4xx_cpld->spi, &m);
-}
-EXPORT_SYMBOL_GPL(rb4xx_cpld_write);
-
-static int rb4xx_cpld_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- struct rb4xx_cpld *cpld = gpio_to_cpld(chip);
- int ret;
-
- mutex_lock(&cpld->lock);
- ret = (cpld->config >> offset) & 1;
- mutex_unlock(&cpld->lock);
-
- return ret;
-}
-
-static void rb4xx_cpld_gpio_set(struct gpio_chip *chip, unsigned offset,
- int value)
-{
- struct rb4xx_cpld *cpld = gpio_to_cpld(chip);
-
- mutex_lock(&cpld->lock);
- __rb4xx_cpld_change_cfg(cpld, (1 << offset), !!value << offset);
- mutex_unlock(&cpld->lock);
-}
-
-static int rb4xx_cpld_gpio_direction_input(struct gpio_chip *chip,
- unsigned offset)
-{
- return -EOPNOTSUPP;
-}
-
-static int rb4xx_cpld_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset,
- int value)
-{
- struct rb4xx_cpld *cpld = gpio_to_cpld(chip);
- int ret;
-
- mutex_lock(&cpld->lock);
- ret = __rb4xx_cpld_change_cfg(cpld, (1 << offset), !!value << offset);
- mutex_unlock(&cpld->lock);
-
- return ret;
-}
-
-static int rb4xx_cpld_gpio_init(struct rb4xx_cpld *cpld, unsigned int base)
-{
- int err;
-
- /* init config */
- cpld->config = CPLD_CFG_nLED1 | CPLD_CFG_nLED2 | CPLD_CFG_nLED3 |
- CPLD_CFG_nLED4 | CPLD_CFG_nCE;
- rb4xx_cpld_write_cfg(cpld, cpld->config);
-
- /* setup GPIO chip */
- cpld->chip.label = DRV_NAME;
-
- cpld->chip.get = rb4xx_cpld_gpio_get;
- cpld->chip.set = rb4xx_cpld_gpio_set;
- cpld->chip.direction_input = rb4xx_cpld_gpio_direction_input;
- cpld->chip.direction_output = rb4xx_cpld_gpio_direction_output;
-
- cpld->chip.base = base;
- cpld->chip.ngpio = CPLD_NUM_GPIOS;
- cpld->chip.can_sleep = 1;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
- cpld->chip.dev = &cpld->spi->dev;
-#else
- cpld->chip.parent = &cpld->spi->dev;
-#endif
- cpld->chip.owner = THIS_MODULE;
-
- err = gpiochip_add(&cpld->chip);
- if (err)
- dev_err(&cpld->spi->dev, "adding GPIO chip failed, err=%d\n",
- err);
-
- return err;
-}
-
-static int rb4xx_cpld_probe(struct spi_device *spi)
-{
- struct rb4xx_cpld *cpld;
- struct rb4xx_cpld_platform_data *pdata;
- int err;
-
- pdata = spi->dev.platform_data;
- if (!pdata) {
- dev_dbg(&spi->dev, "no platform data\n");
- return -EINVAL;
- }
-
- cpld = kzalloc(sizeof(*cpld), GFP_KERNEL);
- if (!cpld) {
- dev_err(&spi->dev, "no memory for private data\n");
- return -ENOMEM;
- }
-
- mutex_init(&cpld->lock);
- cpld->spi = spi_dev_get(spi);
- dev_set_drvdata(&spi->dev, cpld);
-
- spi->mode = SPI_MODE_0 | SPI_TX_DUAL;
- spi->bits_per_word = 8;
- err = spi_setup(spi);
- if (err) {
- dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
- goto err_drvdata;
- }
-
- err = rb4xx_cpld_gpio_init(cpld, pdata->gpio_base);
- if (err)
- goto err_drvdata;
-
- rb4xx_cpld = cpld;
-
- return 0;
-
-err_drvdata:
- dev_set_drvdata(&spi->dev, NULL);
- kfree(cpld);
-
- return err;
-}
-
-static int rb4xx_cpld_remove(struct spi_device *spi)
-{
- struct rb4xx_cpld *cpld;
-
- rb4xx_cpld = NULL;
- cpld = dev_get_drvdata(&spi->dev);
- dev_set_drvdata(&spi->dev, NULL);
- kfree(cpld);
-
- return 0;
-}
-
-static struct spi_driver rb4xx_cpld_driver = {
- .driver = {
- .name = DRV_NAME,
- .bus = &spi_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = rb4xx_cpld_probe,
- .remove = rb4xx_cpld_remove,
-};
-
-static int __init rb4xx_cpld_init(void)
-{
- return spi_register_driver(&rb4xx_cpld_driver);
-}
-module_init(rb4xx_cpld_init);
-
-static void __exit rb4xx_cpld_exit(void)
-{
- spi_unregister_driver(&rb4xx_cpld_driver);
-}
-module_exit(rb4xx_cpld_exit);
-
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_VERSION(DRV_VERSION);
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_LICENSE("GPL v2");
projects / openwrt / openwrt.git / blobdiff