+++ /dev/null
-/*
- * AMD CS5535/CS5536 GPIO driver.
- * Allows a user space process to play with the GPIO pins.
- *
- * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the smems of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- */
-
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/cdev.h>
-#include <linux/ioport.h>
-#include <linux/pci.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-
-
-#define NAME "cs5535_gpio"
-
-MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
-MODULE_DESCRIPTION("AMD CS5535/CS5536 GPIO Pin Driver");
-MODULE_LICENSE("GPL");
-
-static int major;
-module_param(major, int, 0);
-MODULE_PARM_DESC(major, "Major device number");
-
-static ulong mask;
-module_param(mask, ulong, 0);
-MODULE_PARM_DESC(mask, "GPIO channel mask");
-
-#define MSR_LBAR_GPIO 0x5140000C
-
-static u32 gpio_base;
-
-static struct pci_device_id divil_pci[] = {
- { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
- { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
- { } /* NULL entry */
-};
-MODULE_DEVICE_TABLE(pci, divil_pci);
-
-static struct cdev cs5535_gpio_cdev;
-
-/* reserve 32 entries even though some aren't usable */
-#define CS5535_GPIO_COUNT 32
-
-/* IO block size */
-#define CS5535_GPIO_SIZE 256
-
-struct gpio_regmap {
- u32 rd_offset;
- u32 wr_offset;
- char on;
- char off;
-};
-static struct gpio_regmap rm[] =
-{
- { 0x30, 0x00, '1', '0' }, /* GPIOx_READ_BACK / GPIOx_OUT_VAL */
- { 0x20, 0x20, 'I', 'i' }, /* GPIOx_IN_EN */
- { 0x04, 0x04, 'O', 'o' }, /* GPIOx_OUT_EN */
- { 0x08, 0x08, 't', 'T' }, /* GPIOx_OUT_OD_EN */
- { 0x18, 0x18, 'P', 'p' }, /* GPIOx_OUT_PU_EN */
- { 0x1c, 0x1c, 'D', 'd' }, /* GPIOx_OUT_PD_EN */
-};
-
-
-/**
- * Gets the register offset for the GPIO bank.
- * Low (0-15) starts at 0x00, high (16-31) starts at 0x80
- */
-static inline u32 cs5535_lowhigh_base(int reg)
-{
- return (reg & 0x10) << 3;
-}
-
-static ssize_t cs5535_gpio_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- u32 m = iminor(file->f_path.dentry->d_inode);
- int i, j;
- u32 base = gpio_base + cs5535_lowhigh_base(m);
- u32 m0, m1;
- char c;
-
- /**
- * Creates the mask for atomic bit programming.
- * The high 16 bits and the low 16 bits are used to set the mask.
- * For example, GPIO 15 maps to 31,15: 0,1 => On; 1,0=> Off
- */
- m1 = 1 << (m & 0x0F);
- m0 = m1 << 16;
-
- for (i = 0; i < len; ++i) {
- if (get_user(c, data+i))
- return -EFAULT;
-
- for (j = 0; j < ARRAY_SIZE(rm); j++) {
- if (c == rm[j].on) {
- outl(m1, base + rm[j].wr_offset);
- /* If enabling output, turn off AUX 1 and AUX 2 */
- if (c == 'O') {
- outl(m0, base + 0x10);
- outl(m0, base + 0x14);
- }
- break;
- } else if (c == rm[j].off) {
- outl(m0, base + rm[j].wr_offset);
- break;
- }
- }
- }
- *ppos = 0;
- return len;
-}
-
-static ssize_t cs5535_gpio_read(struct file *file, char __user *buf,
- size_t len, loff_t *ppos)
-{
- u32 m = iminor(file->f_path.dentry->d_inode);
- u32 base = gpio_base + cs5535_lowhigh_base(m);
- int rd_bit = 1 << (m & 0x0f);
- int i;
- char ch;
- ssize_t count = 0;
-
- if (*ppos >= ARRAY_SIZE(rm))
- return 0;
-
- for (i = *ppos; (i < (*ppos + len)) && (i < ARRAY_SIZE(rm)); i++) {
- ch = (inl(base + rm[i].rd_offset) & rd_bit) ?
- rm[i].on : rm[i].off;
-
- if (put_user(ch, buf+count))
- return -EFAULT;
-
- count++;
- }
-
- /* add a line-feed if there is room */
- if ((i == ARRAY_SIZE(rm)) && (count < len)) {
- if (put_user('\n', buf + count))
- return -EFAULT;
- count++;
- }
-
- *ppos += count;
- return count;
-}
-
-static int cs5535_gpio_open(struct inode *inode, struct file *file)
-{
- u32 m = iminor(inode);
-
- /* the mask says which pins are usable by this driver */
- if ((mask & (1 << m)) == 0)
- return -EINVAL;
-
- return nonseekable_open(inode, file);
-}
-
-static const struct file_operations cs5535_gpio_fops = {
- .owner = THIS_MODULE,
- .write = cs5535_gpio_write,
- .read = cs5535_gpio_read,
- .open = cs5535_gpio_open,
- .llseek = no_llseek,
-};
-
-static int __init cs5535_gpio_init(void)
-{
- dev_t dev_id;
- u32 low, hi;
- int retval;
-
- if (pci_dev_present(divil_pci) == 0) {
- printk(KERN_WARNING NAME ": DIVIL not found\n");
- return -ENODEV;
- }
-
- /* Grab the GPIO I/O range */
- rdmsr(MSR_LBAR_GPIO, low, hi);
-
- /* Check the mask and whether GPIO is enabled (sanity check) */
- if (hi != 0x0000f001) {
- printk(KERN_WARNING NAME ": GPIO not enabled\n");
- return -ENODEV;
- }
-
- /* Mask off the IO base address */
- gpio_base = low & 0x0000ff00;
-
- /**
- * Some GPIO pins
- * 31-29,23 : reserved (always mask out)
- * 28 : Power Button
- * 26 : PME#
- * 22-16 : LPC
- * 14,15 : SMBus
- * 9,8 : UART1
- * 7 : PCI INTB
- * 3,4 : UART2/DDC
- * 2 : IDE_IRQ0
- * 0 : PCI INTA
- *
- * If a mask was not specified, be conservative and only allow:
- * 1,2,5,6,10-13,24,25,27
- */
- if (mask != 0)
- mask &= 0x1f7fffff;
- else
- mask = 0x0b003c66;
-
- if (!request_region(gpio_base, CS5535_GPIO_SIZE, NAME)) {
- printk(KERN_ERR NAME ": can't allocate I/O for GPIO\n");
- return -ENODEV;
- }
-
- if (major) {
- dev_id = MKDEV(major, 0);
- retval = register_chrdev_region(dev_id, CS5535_GPIO_COUNT,
- NAME);
- } else {
- retval = alloc_chrdev_region(&dev_id, 0, CS5535_GPIO_COUNT,
- NAME);
- major = MAJOR(dev_id);
- }
-
- if (retval) {
- release_region(gpio_base, CS5535_GPIO_SIZE);
- return -1;
- }
-
- printk(KERN_DEBUG NAME ": base=%#x mask=%#lx major=%d\n",
- gpio_base, mask, major);
-
- cdev_init(&cs5535_gpio_cdev, &cs5535_gpio_fops);
- cdev_add(&cs5535_gpio_cdev, dev_id, CS5535_GPIO_COUNT);
-
- return 0;
-}
-
-static void __exit cs5535_gpio_cleanup(void)
-{
- dev_t dev_id = MKDEV(major, 0);
-
- cdev_del(&cs5535_gpio_cdev);
- unregister_chrdev_region(dev_id, CS5535_GPIO_COUNT);
- release_region(gpio_base, CS5535_GPIO_SIZE);
-}
-
-module_init(cs5535_gpio_init);
-module_exit(cs5535_gpio_cleanup);
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff