diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers/char/danube_gpio.c')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/char/danube_gpio.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/char/danube_gpio.c b/target/linux/ifxmips/files/drivers/char/danube_gpio.c new file mode 100644 index 0000000000..dbdb71e8fb --- /dev/null +++ b/target/linux/ifxmips/files/drivers/char/danube_gpio.c @@ -0,0 +1,442 @@ +/* + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) 2005 infineon + * Copyright (C) 2007 John Crispin <blogic@openwrt.org> + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/proc_fs.h> +#include <linux/init.h> +#include <linux/ioctl.h> +#include <asm/semaphore.h> +#include <asm/uaccess.h> +#include <asm/danube/danube.h> +#include <asm/danube/danube_ioctl.h> + +#define MAX_PORTS 2 +#define PINS_PER_PORT 16 + +static unsigned int danube_gpio_major = 0; + +/* TODO do we need this ? */ +static struct semaphore port_sem; + +/* TODO do we really need this ? return in a define is forbidden by coding style */ +#define DANUBE_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; } + +int +danube_port_reserve_pin (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + printk("%s : call to obseleted function\n", __func__); + + return 0; +} +EXPORT_SYMBOL(danube_port_reserve_pin); + +int +danube_port_free_pin (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + printk("%s : call to obseleted function\n", __func__); + + return 0; +} +EXPORT_SYMBOL(danube_port_free_pin); + +int +danube_port_set_open_drain (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_OD + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_OD); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_open_drain); + +int +danube_port_clear_open_drain (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_OD + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_OD); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_open_drain); + +int +danube_port_set_pudsel (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_PUDSEL + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_PUDSEL); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_pudsel); + +int +danube_port_clear_pudsel (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_PUDSEL + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_PUDSEL); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_pudsel); + +int +danube_port_set_puden (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_PUDEN + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_PUDEN); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_puden); + +int +danube_port_clear_puden (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_PUDEN + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_PUDEN); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_puden); + +int +danube_port_set_stoff (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_STOFF + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_STOFF); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_stoff); + +int +danube_port_clear_stoff (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_STOFF + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_STOFF); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_stoff); + +int +danube_port_set_dir_out (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_DIR + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_DIR); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_dir_out); + +int +danube_port_set_dir_in (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_DIR + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_DIR); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_dir_in); + +int +danube_port_set_output (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_OUT + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_OUT); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_output); + +int +danube_port_clear_output (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_OUT + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_OUT); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_output); + +int +danube_port_get_input (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + + if (readl(DANUBE_GPIO_P0_IN + (port * 0x30)) & (1 << pin)) + return 0; + else + return 1; +} +EXPORT_SYMBOL(danube_port_get_input); + +int +danube_port_set_altsel0 (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_ALTSEL0 + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_ALTSEL0); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_altsel0); + +int +danube_port_clear_altsel0 (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_ALTSEL0 + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_ALTSEL0); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_altsel0); + +int +danube_port_set_altsel1 (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_ALTSEL1 + (port * 0x30)) | (1 << pin), DANUBE_GPIO_P0_ALTSEL1); + + return 0; +} +EXPORT_SYMBOL(danube_port_set_altsel1); + +int +danube_port_clear_altsel1 (unsigned int port, unsigned int pin) +{ + DANUBE_GPIO_SANITY; + writel(readl(DANUBE_GPIO_P0_ALTSEL1 + (port * 0x30)) & ~(1 << pin), DANUBE_GPIO_P0_ALTSEL1); + + return 0; +} +EXPORT_SYMBOL(danube_port_clear_altsel1); + +long danube_port_read_procmem_helper(char* tag, u32* in_reg, char *buf) +{ + u32 reg, bit = 0; + unsigned int len, t; + + len = sprintf(buf, "\n%s: ", tag); + reg = readl(in_reg); + bit = 0x80000000; + for (t = 0; t < 32; t++) { + if ((reg & bit) > 0) + len = len + sprintf(buf + len, "X"); + else + len = len + sprintf(buf + len, " "); + bit = bit >> 1; + } + + return len; +} + +int +danube_port_read_procmem (char *buf, char **start, off_t offset, int count, + int *eof, void *data) +{ + long len = sprintf (buf, "\nDanube Port Settings\n"); + + len += sprintf (buf + len, + " 3 2 1 0\n"); + len += sprintf (buf + len, + " 10987654321098765432109876543210\n"); + len += sprintf (buf + len, + "----------------------------------------\n"); + + len += danube_port_read_procmem_helper("P0-OUT", DANUBE_GPIO_P0_OUT, &buf[len]); + len += danube_port_read_procmem_helper("P1-OUT", DANUBE_GPIO_P1_OUT, &buf[len]); + len += danube_port_read_procmem_helper("P0-IN ", DANUBE_GPIO_P0_IN, &buf[len]); + len += danube_port_read_procmem_helper("P1-IN ", DANUBE_GPIO_P1_IN, &buf[len]); + len += danube_port_read_procmem_helper("P0-DIR", DANUBE_GPIO_P0_DIR, &buf[len]); + len += danube_port_read_procmem_helper("P1-DIR", DANUBE_GPIO_P1_DIR, &buf[len]); + len += danube_port_read_procmem_helper("P0-STO ", DANUBE_GPIO_P0_STOFF, &buf[len]); + len += danube_port_read_procmem_helper("P1-STO ", DANUBE_GPIO_P1_STOFF, &buf[len]); + len += danube_port_read_procmem_helper("P0-PUDE", DANUBE_GPIO_P0_PUDEN, &buf[len]); + len += danube_port_read_procmem_helper("P1-PUDE", DANUBE_GPIO_P1_PUDEN, &buf[len]); + len += danube_port_read_procmem_helper("P0-OD ", DANUBE_GPIO_P0_OD, &buf[len]); + len += danube_port_read_procmem_helper("P1-OD ", DANUBE_GPIO_P1_OD, &buf[len]); + len += danube_port_read_procmem_helper("P0-PUDS", DANUBE_GPIO_P0_PUDSEL, &buf[len]); + len += danube_port_read_procmem_helper("P1-PUDS", DANUBE_GPIO_P1_PUDSEL, &buf[len]); + len += danube_port_read_procmem_helper("P0-ALT0", DANUBE_GPIO_P0_ALTSEL0, &buf[len]); + len += danube_port_read_procmem_helper("P1-ALT0", DANUBE_GPIO_P1_ALTSEL0, &buf[len]); + len += danube_port_read_procmem_helper("P0-ALT1", DANUBE_GPIO_P0_ALTSEL1, &buf[len]); + len += danube_port_read_procmem_helper("P1-ALT1", DANUBE_GPIO_P1_ALTSEL1, &buf[len]); + len = len + sprintf (buf + len, "\n\n"); + + *eof = 1; + + return len; +} + +static int +danube_port_open (struct inode *inode, struct file *filep) +{ + return 0; +} + +static int +danube_port_release (struct inode *inode, struct file *filelp) +{ + return 0; +} + +static int +danube_port_ioctl (struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + int ret = 0; + volatile struct danube_port_ioctl_parm parm; + + if (_IOC_TYPE (cmd) != DANUBE_PORT_IOC_MAGIC) + return -EINVAL; + + if (_IOC_DIR (cmd) & _IOC_WRITE) { + if (!access_ok + (VERIFY_READ, arg, + sizeof (struct danube_port_ioctl_parm))) + return -EFAULT; + ret = copy_from_user ((void *) &parm, (void *) arg, + sizeof (struct danube_port_ioctl_parm)); + } + if (_IOC_DIR (cmd) & _IOC_READ) { + if (!access_ok + (VERIFY_WRITE, arg, + sizeof (struct danube_port_ioctl_parm))) + return -EFAULT; + } + + if (down_trylock (&port_sem) != 0) + return -EBUSY; + + switch (cmd) { + case DANUBE_PORT_IOCOD: + if (parm.value == 0x00) + danube_port_clear_open_drain(parm.port, parm.pin); + else + danube_port_set_open_drain(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCPUDSEL: + if (parm.value == 0x00) + danube_port_clear_pudsel(parm.port, parm.pin); + else + danube_port_set_pudsel(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCPUDEN: + if (parm.value == 0x00) + danube_port_clear_puden(parm.port, parm.pin); + else + danube_port_set_puden(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCSTOFF: + if (parm.value == 0x00) + danube_port_clear_stoff(parm.port, parm.pin); + else + danube_port_set_stoff(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCDIR: + if (parm.value == 0x00) + danube_port_set_dir_in(parm.port, parm.pin); + else + danube_port_set_dir_out(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCOUTPUT: + if (parm.value == 0x00) + danube_port_clear_output(parm.port, parm.pin); + else + danube_port_set_output(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCALTSEL0: + if (parm.value == 0x00) + danube_port_clear_altsel0(parm.port, parm.pin); + else + danube_port_set_altsel0(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCALTSEL1: + if (parm.value == 0x00) + danube_port_clear_altsel1(parm.port, parm.pin); + else + danube_port_set_altsel1(parm.port, parm.pin); + break; + + case DANUBE_PORT_IOCINPUT: + parm.value = danube_port_get_input(parm.port, parm.pin); + copy_to_user((void*)arg, (void*)&parm, + sizeof(struct danube_port_ioctl_parm)); + break; + + default: + ret = -EINVAL; + } + + up (&port_sem); + + return ret; +} + +static struct file_operations port_fops = { + .open = danube_port_open, + .release = danube_port_release, + .ioctl = danube_port_ioctl +}; + +int __init +danube_gpio_init (void) +{ + int retval = 0; + + sema_init (&port_sem, 1); + + danube_gpio_major = register_chrdev(0, "danube_gpio", &port_fops); + if (!danube_gpio_major) + { + printk("danube-port: Error! Could not register port device. #%d\n", danube_gpio_major); + retval = -EINVAL; + goto out; + } + + create_proc_read_entry("danube_gpio", 0, NULL, + danube_port_read_procmem, NULL); + + printk("registered danube gpio driver\n"); + +out: + return retval; +} + +void __exit +danube_gpio_exit (void) +{ + unregister_chrdev(danube_gpio_major, "danube_gpio"); + remove_proc_entry("danube_gpio", NULL); +} + +module_init(danube_gpio_init); +module_exit(danube_gpio_exit); |