360 lines
7.1 KiB
C
360 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for TANBAC TB0219 base board.
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*
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* Copyright (C) 2005 Yoichi Yuasa <yuasa@linux-mips.org>
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*/
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#include <linux/platform_device.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <asm/reboot.h>
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#include <asm/vr41xx/giu.h>
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#include <asm/vr41xx/tb0219.h>
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MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
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MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
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MODULE_LICENSE("GPL");
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static int major; /* default is dynamic major device number */
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module_param(major, int, 0);
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MODULE_PARM_DESC(major, "Major device number");
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static void (*old_machine_restart)(char *command);
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static void __iomem *tb0219_base;
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static DEFINE_SPINLOCK(tb0219_lock);
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#define tb0219_read(offset) readw(tb0219_base + (offset))
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#define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
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#define TB0219_START 0x0a000000UL
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#define TB0219_SIZE 0x20UL
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#define TB0219_LED 0x00
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#define TB0219_GPIO_INPUT 0x02
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#define TB0219_GPIO_OUTPUT 0x04
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#define TB0219_DIP_SWITCH 0x06
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#define TB0219_MISC 0x08
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#define TB0219_RESET 0x0e
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#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10
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#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12
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#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14
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typedef enum {
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TYPE_LED,
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TYPE_GPIO_OUTPUT,
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} tb0219_type_t;
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/*
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* Minor device number
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* 0 = 7 segment LED
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*
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* 16 = GPIO IN 0
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* 17 = GPIO IN 1
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* 18 = GPIO IN 2
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* 19 = GPIO IN 3
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* 20 = GPIO IN 4
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* 21 = GPIO IN 5
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* 22 = GPIO IN 6
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* 23 = GPIO IN 7
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*
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* 32 = GPIO OUT 0
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* 33 = GPIO OUT 1
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* 34 = GPIO OUT 2
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* 35 = GPIO OUT 3
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* 36 = GPIO OUT 4
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* 37 = GPIO OUT 5
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* 38 = GPIO OUT 6
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* 39 = GPIO OUT 7
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*
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* 48 = DIP switch 1
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* 49 = DIP switch 2
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* 50 = DIP switch 3
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* 51 = DIP switch 4
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* 52 = DIP switch 5
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* 53 = DIP switch 6
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* 54 = DIP switch 7
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* 55 = DIP switch 8
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*/
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static inline char get_led(void)
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{
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return (char)tb0219_read(TB0219_LED);
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}
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static inline char get_gpio_input_pin(unsigned int pin)
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{
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uint16_t values;
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values = tb0219_read(TB0219_GPIO_INPUT);
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if (values & (1 << pin))
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return '1';
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return '0';
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}
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static inline char get_gpio_output_pin(unsigned int pin)
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{
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uint16_t values;
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values = tb0219_read(TB0219_GPIO_OUTPUT);
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if (values & (1 << pin))
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return '1';
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return '0';
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}
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static inline char get_dip_switch(unsigned int pin)
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{
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uint16_t values;
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values = tb0219_read(TB0219_DIP_SWITCH);
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if (values & (1 << pin))
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return '1';
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return '0';
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}
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static inline int set_led(char command)
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{
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tb0219_write(TB0219_LED, command);
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return 0;
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}
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static inline int set_gpio_output_pin(unsigned int pin, char command)
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{
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unsigned long flags;
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uint16_t value;
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if (command != '0' && command != '1')
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return -EINVAL;
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spin_lock_irqsave(&tb0219_lock, flags);
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value = tb0219_read(TB0219_GPIO_OUTPUT);
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if (command == '0')
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value &= ~(1 << pin);
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else
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value |= 1 << pin;
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tb0219_write(TB0219_GPIO_OUTPUT, value);
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spin_unlock_irqrestore(&tb0219_lock, flags);
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return 0;
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}
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static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
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loff_t *ppos)
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{
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unsigned int minor;
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char value;
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minor = iminor(file_inode(file));
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switch (minor) {
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case 0:
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value = get_led();
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break;
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case 16 ... 23:
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value = get_gpio_input_pin(minor - 16);
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break;
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case 32 ... 39:
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value = get_gpio_output_pin(minor - 32);
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break;
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case 48 ... 55:
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value = get_dip_switch(minor - 48);
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break;
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default:
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return -EBADF;
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}
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if (len <= 0)
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return -EFAULT;
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if (put_user(value, buf))
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return -EFAULT;
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return 1;
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}
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static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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unsigned int minor;
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tb0219_type_t type;
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size_t i;
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int retval = 0;
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char c;
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minor = iminor(file_inode(file));
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switch (minor) {
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case 0:
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type = TYPE_LED;
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break;
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case 32 ... 39:
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type = TYPE_GPIO_OUTPUT;
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break;
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default:
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return -EBADF;
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}
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for (i = 0; i < len; i++) {
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if (get_user(c, data + i))
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return -EFAULT;
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switch (type) {
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case TYPE_LED:
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retval = set_led(c);
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break;
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case TYPE_GPIO_OUTPUT:
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retval = set_gpio_output_pin(minor - 32, c);
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break;
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}
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if (retval < 0)
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break;
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}
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return i;
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}
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static int tanbac_tb0219_open(struct inode *inode, struct file *file)
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{
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unsigned int minor;
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minor = iminor(inode);
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switch (minor) {
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case 0:
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case 16 ... 23:
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case 32 ... 39:
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case 48 ... 55:
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return stream_open(inode, file);
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default:
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break;
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}
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return -EBADF;
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}
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static int tanbac_tb0219_release(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static const struct file_operations tb0219_fops = {
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.owner = THIS_MODULE,
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.read = tanbac_tb0219_read,
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.write = tanbac_tb0219_write,
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.open = tanbac_tb0219_open,
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.release = tanbac_tb0219_release,
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.llseek = no_llseek,
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};
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static void tb0219_restart(char *command)
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{
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tb0219_write(TB0219_RESET, 0);
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}
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static void tb0219_pci_irq_init(void)
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{
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/* PCI Slot 1 */
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vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
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vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
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/* PCI Slot 2 */
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vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
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vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
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/* PCI Slot 3 */
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vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
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vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
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}
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static int tb0219_probe(struct platform_device *dev)
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{
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int retval;
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if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
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return -EBUSY;
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tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
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if (tb0219_base == NULL) {
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release_mem_region(TB0219_START, TB0219_SIZE);
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return -ENOMEM;
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}
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retval = register_chrdev(major, "TB0219", &tb0219_fops);
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if (retval < 0) {
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iounmap(tb0219_base);
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tb0219_base = NULL;
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release_mem_region(TB0219_START, TB0219_SIZE);
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return retval;
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}
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old_machine_restart = _machine_restart;
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_machine_restart = tb0219_restart;
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tb0219_pci_irq_init();
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if (major == 0) {
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major = retval;
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printk(KERN_INFO "TB0219: major number %d\n", major);
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}
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return 0;
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}
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static int tb0219_remove(struct platform_device *dev)
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{
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_machine_restart = old_machine_restart;
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iounmap(tb0219_base);
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tb0219_base = NULL;
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release_mem_region(TB0219_START, TB0219_SIZE);
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return 0;
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}
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static struct platform_device *tb0219_platform_device;
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static struct platform_driver tb0219_device_driver = {
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.probe = tb0219_probe,
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.remove = tb0219_remove,
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.driver = {
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.name = "TB0219",
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},
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};
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static int __init tanbac_tb0219_init(void)
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{
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int retval;
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tb0219_platform_device = platform_device_alloc("TB0219", -1);
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if (!tb0219_platform_device)
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return -ENOMEM;
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retval = platform_device_add(tb0219_platform_device);
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if (retval < 0) {
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platform_device_put(tb0219_platform_device);
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return retval;
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}
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retval = platform_driver_register(&tb0219_device_driver);
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if (retval < 0)
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platform_device_unregister(tb0219_platform_device);
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return retval;
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}
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static void __exit tanbac_tb0219_exit(void)
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{
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platform_driver_unregister(&tb0219_device_driver);
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platform_device_unregister(tb0219_platform_device);
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}
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module_init(tanbac_tb0219_init);
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module_exit(tanbac_tb0219_exit);
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