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[PATCH] i386: GPIO driver for AMD CS5535/CS5536
A simple driver for the CS5535 and CS5536 that allows a user-space program to manipulate GPIO pins. The CS5535/CS5536 chips are Geode processor companion devices. Signed-off-by: Ben Gardner <bgardner@wabtec.com> Signed-off-by: Richard Knutsson <ricknu-0@student.ltu.se> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ben Gardner
Linus Torvalds
parent
6dd214b554
commit
e329113ca4
5 changed files with 270 additions and 1 deletions
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@ -936,6 +936,15 @@ config SCx200_GPIO
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If compiled as a module, it will be called scx200_gpio.
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config CS5535_GPIO
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tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
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depends on X86_32
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help
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Give userspace access to the GPIO pins on the AMD CS5535 and
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CS5536 Geode companion devices.
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If compiled as a module, it will be called cs5535_gpio.
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config GPIO_VR41XX
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tristate "NEC VR4100 series General-purpose I/O Unit support"
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depends on CPU_VR41XX
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@ -81,6 +81,7 @@ obj-$(CONFIG_PPDEV) += ppdev.o
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obj-$(CONFIG_NWBUTTON) += nwbutton.o
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obj-$(CONFIG_NWFLASH) += nwflash.o
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obj-$(CONFIG_SCx200_GPIO) += scx200_gpio.o
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obj-$(CONFIG_CS5535_GPIO) += cs5535_gpio.o
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obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
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obj-$(CONFIG_TANBAC_TB0219) += tb0219.o
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obj-$(CONFIG_TELCLOCK) += tlclk.o
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250
drivers/char/cs5535_gpio.c
Normal file
250
drivers/char/cs5535_gpio.c
Normal file
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@ -0,0 +1,250 @@
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/*
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* AMD CS5535/CS5536 GPIO driver.
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* Allows a user space process to play with the GPIO pins.
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*
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* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the smems of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/cdev.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define NAME "cs5535_gpio"
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MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
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MODULE_DESCRIPTION("AMD CS5535/CS5536 GPIO Pin Driver");
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MODULE_LICENSE("GPL");
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static int major;
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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 ulong mask;
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module_param(mask, ulong, 0);
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MODULE_PARM_DESC(mask, "GPIO channel mask");
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#define MSR_LBAR_GPIO 0x5140000C
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static u32 gpio_base;
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static struct pci_device_id divil_pci[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
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{ } /* NULL entry */
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};
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static struct cdev cs5535_gpio_cdev;
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/* reserve 32 entries even though some aren't usable */
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#define CS5535_GPIO_COUNT 32
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/* IO block size */
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#define CS5535_GPIO_SIZE 256
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struct gpio_regmap {
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u32 rd_offset;
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u32 wr_offset;
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char on;
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char off;
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};
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static struct gpio_regmap rm[] =
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{
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{ 0x30, 0x00, '1', '0' }, /* GPIOx_READ_BACK / GPIOx_OUT_VAL */
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{ 0x20, 0x20, 'I', 'i' }, /* GPIOx_IN_EN */
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{ 0x04, 0x04, 'O', 'o' }, /* GPIOx_OUT_EN */
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{ 0x08, 0x08, 't', 'T' }, /* GPIOx_OUT_OD_EN */
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{ 0x18, 0x18, 'P', 'p' }, /* GPIOx_OUT_PU_EN */
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{ 0x1c, 0x1c, 'D', 'd' }, /* GPIOx_OUT_PD_EN */
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};
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/**
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* Gets the register offset for the GPIO bank.
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* Low (0-15) starts at 0x00, high (16-31) starts at 0x80
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*/
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static inline u32 cs5535_lowhigh_base(int reg)
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{
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return (reg & 0x10) << 3;
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}
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static ssize_t cs5535_gpio_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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u32 m = iminor(file->f_dentry->d_inode);
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int i, j;
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u32 base = gpio_base + cs5535_lowhigh_base(m);
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u32 m0, m1;
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char c;
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/**
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* Creates the mask for atomic bit programming.
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* The high 16 bits and the low 16 bits are used to set the mask.
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* For example, GPIO 15 maps to 31,15: 0,1 => On; 1,0=> Off
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*/
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m1 = 1 << (m & 0x0F);
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m0 = m1 << 16;
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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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for (j = 0; j < ARRAY_SIZE(rm); j++) {
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if (c == rm[j].on) {
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outl(m1, base + rm[j].wr_offset);
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break;
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} else if (c == rm[j].off) {
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outl(m0, base + rm[j].wr_offset);
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break;
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}
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}
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}
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*ppos = 0;
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return len;
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}
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static ssize_t cs5535_gpio_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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u32 m = iminor(file->f_dentry->d_inode);
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u32 base = gpio_base + cs5535_lowhigh_base(m);
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int rd_bit = 1 << (m & 0x0f);
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int i;
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char ch;
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ssize_t count = 0;
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if (*ppos >= ARRAY_SIZE(rm))
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return 0;
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for (i = *ppos; (i < (*ppos + len)) && (i < ARRAY_SIZE(rm)); i++) {
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ch = (inl(base + rm[i].rd_offset) & rd_bit) ?
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rm[i].on : rm[i].off;
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if (put_user(ch, buf+count))
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return -EFAULT;
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count++;
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}
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/* add a line-feed if there is room */
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if ((i == ARRAY_SIZE(rm)) && (count < len)) {
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put_user('\n', buf + count);
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count++;
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}
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*ppos += count;
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return count;
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}
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static int cs5535_gpio_open(struct inode *inode, struct file *file)
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{
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u32 m = iminor(inode);
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/* the mask says which pins are usable by this driver */
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if ((mask & (1 << m)) == 0)
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return -EINVAL;
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return nonseekable_open(inode, file);
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}
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static struct file_operations cs5535_gpio_fops = {
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.owner = THIS_MODULE,
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.write = cs5535_gpio_write,
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.read = cs5535_gpio_read,
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.open = cs5535_gpio_open
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};
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static int __init cs5535_gpio_init(void)
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{
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dev_t dev_id;
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u32 low, hi;
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int retval;
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if (pci_dev_present(divil_pci) == 0) {
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printk(KERN_WARNING NAME ": DIVIL not found\n");
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return -ENODEV;
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}
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/* Grab the GPIO I/O range */
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rdmsr(MSR_LBAR_GPIO, low, hi);
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/* Check the mask and whether GPIO is enabled (sanity check) */
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if (hi != 0x0000f001) {
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printk(KERN_WARNING NAME ": GPIO not enabled\n");
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return -ENODEV;
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}
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/* Mask off the IO base address */
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gpio_base = low & 0x0000ff00;
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/**
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* Some GPIO pins
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* 31-29,23 : reserved (always mask out)
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* 28 : Power Button
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* 26 : PME#
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* 22-16 : LPC
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* 14,15 : SMBus
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* 9,8 : UART1
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* 7 : PCI INTB
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* 3,4 : UART2/DDC
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* 2 : IDE_IRQ0
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* 0 : PCI INTA
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*
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* If a mask was not specified, be conservative and only allow:
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* 1,2,5,6,10-13,24,25,27
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*/
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if (mask != 0)
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mask &= 0x1f7fffff;
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else
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mask = 0x0b003c66;
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if (request_region(gpio_base, CS5535_GPIO_SIZE, NAME) == 0) {
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printk(KERN_ERR NAME ": can't allocate I/O for GPIO\n");
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return -ENODEV;
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}
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if (major) {
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dev_id = MKDEV(major, 0);
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retval = register_chrdev_region(dev_id, CS5535_GPIO_COUNT,
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NAME);
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} else {
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retval = alloc_chrdev_region(&dev_id, 0, CS5535_GPIO_COUNT,
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NAME);
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major = MAJOR(dev_id);
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}
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if (retval) {
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release_region(gpio_base, CS5535_GPIO_SIZE);
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return -1;
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}
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printk(KERN_DEBUG NAME ": base=%#x mask=%#lx major=%d\n",
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gpio_base, mask, major);
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cdev_init(&cs5535_gpio_cdev, &cs5535_gpio_fops);
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cdev_add(&cs5535_gpio_cdev, dev_id, CS5535_GPIO_COUNT);
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return 0;
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}
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static void __exit cs5535_gpio_cleanup(void)
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{
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dev_t dev_id = MKDEV(major, 0);
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unregister_chrdev_region(dev_id, CS5535_GPIO_COUNT);
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if (gpio_base != 0)
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release_region(gpio_base, CS5535_GPIO_SIZE);
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}
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module_init(cs5535_gpio_init);
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module_exit(cs5535_gpio_cleanup);
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@ -377,6 +377,7 @@
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#define PCI_DEVICE_ID_NS_87560_USB 0x0012
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#define PCI_DEVICE_ID_NS_83815 0x0020
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#define PCI_DEVICE_ID_NS_83820 0x0022
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#define PCI_DEVICE_ID_NS_CS5535_ISA 0x002b
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#define PCI_DEVICE_ID_NS_CS5535_IDE 0x002d
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#define PCI_DEVICE_ID_NS_CS5535_AUDIO 0x002e
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#define PCI_DEVICE_ID_NS_CS5535_USB 0x002f
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@ -500,6 +501,14 @@
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#define PCI_DEVICE_ID_AMD_8111_AUDIO 0x746d
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#define PCI_DEVICE_ID_AMD_8151_0 0x7454
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#define PCI_DEVICE_ID_AMD_8131_APIC 0x7450
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#define PCI_DEVICE_ID_AMD_CS5536_ISA 0x2090
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#define PCI_DEVICE_ID_AMD_CS5536_FLASH 0x2091
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#define PCI_DEVICE_ID_AMD_CS5536_AUDIO 0x2093
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#define PCI_DEVICE_ID_AMD_CS5536_OHC 0x2094
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#define PCI_DEVICE_ID_AMD_CS5536_EHC 0x2095
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#define PCI_DEVICE_ID_AMD_CS5536_UDC 0x2096
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#define PCI_DEVICE_ID_AMD_CS5536_UOC 0x2097
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#define PCI_DEVICE_ID_AMD_CS5536_IDE 0x209A
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#define PCI_DEVICE_ID_AMD_CS5536_IDE 0x209A
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@ -385,7 +385,7 @@ static struct pci_driver driver = {
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static int __init alsa_card_cs5535audio_init(void)
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{
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return pci_module_init(&driver);
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return pci_register_driver(&driver);
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}
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static void __exit alsa_card_cs5535audio_exit(void)
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