[PATCH] i386: GPIO driver for AMD CS5535/CS5536 (e329113c) · Commits · git / linux-net

drivers/char/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -936,6 +936,15 @@ config SCx200_GPIO

		If compiled as a module, it will be called scx200_gpio.

		config CS5535_GPIO
		tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
		depends on X86_32
		help
		Give userspace access to the GPIO pins on the AMD CS5535 and
		CS5536 Geode companion devices.

		If compiled as a module, it will be called cs5535_gpio.

		config GPIO_VR41XX
		tristate "NEC VR4100 series General-purpose I/O Unit support"
		depends on CPU_VR41XX

drivers/char/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -81,6 +81,7 @@ obj-$(CONFIG_PPDEV) += ppdev.o
		obj-$(CONFIG_NWBUTTON) += nwbutton.o
		obj-$(CONFIG_NWFLASH) += nwflash.o
		obj-$(CONFIG_SCx200_GPIO) += scx200_gpio.o
		obj-$(CONFIG_CS5535_GPIO) += cs5535_gpio.o
		obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
		obj-$(CONFIG_TANBAC_TB0219) += tb0219.o
		obj-$(CONFIG_TELCLOCK) += tlclk.o

drivers/char/cs5535_gpio.c

0 → 100644

+250 −0

Original line number	Diff line number	Diff line
		/*
		* 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 */
		};

		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_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);
		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_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)) {
		put_user('\n', buf + count);
		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 struct file_operations cs5535_gpio_fops = {
		.owner = THIS_MODULE,
		.write = cs5535_gpio_write,
		.read = cs5535_gpio_read,
		.open = cs5535_gpio_open
		};

		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) == 0) {
		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);
		unregister_chrdev_region(dev_id, CS5535_GPIO_COUNT);
		if (gpio_base != 0)
		release_region(gpio_base, CS5535_GPIO_SIZE);
		}

		module_init(cs5535_gpio_init);
		module_exit(cs5535_gpio_cleanup);

include/linux/pci_ids.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -377,6 +377,7 @@
		#define PCI_DEVICE_ID_NS_87560_USB 0x0012
		#define PCI_DEVICE_ID_NS_83815 0x0020
		#define PCI_DEVICE_ID_NS_83820 0x0022
		#define PCI_DEVICE_ID_NS_CS5535_ISA 0x002b
		#define PCI_DEVICE_ID_NS_CS5535_IDE 0x002d
		#define PCI_DEVICE_ID_NS_CS5535_AUDIO 0x002e
		#define PCI_DEVICE_ID_NS_CS5535_USB 0x002f
		@@ -500,6 +501,14 @@
		#define PCI_DEVICE_ID_AMD_8111_AUDIO 0x746d
		#define PCI_DEVICE_ID_AMD_8151_0 0x7454
		#define PCI_DEVICE_ID_AMD_8131_APIC 0x7450
		#define PCI_DEVICE_ID_AMD_CS5536_ISA 0x2090
		#define PCI_DEVICE_ID_AMD_CS5536_FLASH 0x2091
		#define PCI_DEVICE_ID_AMD_CS5536_AUDIO 0x2093
		#define PCI_DEVICE_ID_AMD_CS5536_OHC 0x2094
		#define PCI_DEVICE_ID_AMD_CS5536_EHC 0x2095
		#define PCI_DEVICE_ID_AMD_CS5536_UDC 0x2096
		#define PCI_DEVICE_ID_AMD_CS5536_UOC 0x2097
		#define PCI_DEVICE_ID_AMD_CS5536_IDE 0x209A

		#define PCI_DEVICE_ID_AMD_CS5536_IDE 0x209A

sound/pci/cs5535audio/cs5535audio.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -385,7 +385,7 @@ static struct pci_driver driver = {

		static int __init alsa_card_cs5535audio_init(void)
		{
		return pci_module_init(&driver);
		return pci_register_driver(&driver);
		}

		static void __exit alsa_card_cs5535audio_exit(void)