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openwrt-xburst/target/linux/storm/patches/1100-gpio.patch
kaloz f4fb68ce2c * refresh storm patches 
* disable BX in uClibc config, add ethernet and watchdog support -- thanks to Zilvinas Valinskas

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11367 3c298f89-4303-0410-b956-a3cf2f4a3e73
2008-06-05 17:10:39 +00:00

385 lines
8.7 KiB
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--- /dev/null
+++ b/drivers/char/gemini_gpio_dev.c
@@ -0,0 +1,356 @@
+/*
+ * GPIO driver for Gemini board
+ * Provides /dev/gpio
+ */
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>
+#include <linux/miscdevice.h>
+#include <asm/uaccess.h> /* copy_to_user, copy_from_user */
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/arch/sl2312.h>
+#include <asm/arch/irqs.h>
+#include <asm/arch/gemini_gpio.h>
+
+#define GEMINI_GPIO_BASE1 IO_ADDRESS(SL2312_GPIO_BASE)
+#define GEMINI_GPIO_BASE2 IO_ADDRESS(SL2312_GPIO_BASE1)
+
+#define GPIO_SET 2
+#define MAX_GPIO_LINE 32*GPIO_SET
+
+wait_queue_head_t gemini_gpio_wait[MAX_GPIO_LINE];
+
+enum GPIO_REG
+{
+ GPIO_DATA_OUT = 0x00,
+ GPIO_DATA_IN = 0x04,
+ GPIO_PIN_DIR = 0x08,
+ GPIO_BY_PASS = 0x0C,
+ GPIO_DATA_SET = 0x10,
+ GPIO_DATA_CLEAR = 0x14,
+ GPIO_PULL_ENABLE = 0x18,
+ GPIO_PULL_TYPE = 0x1C,
+ GPIO_INT_ENABLE = 0x20,
+ GPIO_INT_RAW_STATUS = 0x24,
+ GPIO_INT_MASK_STATUS = 0x28,
+ GPIO_INT_MASK = 0x2C,
+ GPIO_INT_CLEAR = 0x30,
+ GPIO_INT_TRIG = 0x34,
+ GPIO_INT_BOTH = 0x38,
+ GPIO_INT_POLAR = 0x3C
+};
+
+unsigned int regist_gpio_int0=0,regist_gpio_int1=0;
+
+/* defines a specific GPIO bit number and state */
+struct gpio_bit {
+ unsigned char bit;
+ unsigned char state;
+};
+
+#define GPIO_MAJOR 10
+#define GPIO_MINOR 127
+
+/*
+ * ioctl calls that are permitted to the /dev/gpio interface
+ */
+#define GPIO_GET_BIT 0x0000001
+#define GPIO_SET_BIT 0x0000002
+#define GPIO_GET_CONFIG 0x0000003
+#define GPIO_SET_CONFIG 0x0000004
+
+//#define GPIO_CONFIG_OUT 1
+//#define GPIO_CONFIG_IN 2
+
+
+
+#define DEVICE_NAME "gpio"
+
+//#define DEBUG
+
+/*
+ * GPIO interface
+ */
+
+/* /dev/gpio */
+static int gpio_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg);
+
+/* /proc/driver/gpio */
+static int gpio_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data);
+
+static unsigned char gpio_status; /* bitmapped status byte. */
+
+/* functions for set/get gpio lines on storlink cpu */
+
+void gpio_line_get(unsigned char pin, u32 * data)
+{
+ unsigned int set = pin >>5; // each GPIO set has 32 pins
+ unsigned int status,addr;
+
+ addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1) + GPIO_DATA_IN;
+ status = readl(addr);
+#ifdef DEBUG
+ printk("status = %08X, pin = %d, set = %d\n", status, pin, set);
+#endif
+ if (set)
+ *data = (status&(1<<(pin-32)))?1:0;
+ else
+ *data = (status&(1<<pin))?1:0;
+}
+
+void gpio_line_set(unsigned char pin, u32 high)
+{
+ unsigned char set = pin >>5; // each GPIO set has 32 pins
+ unsigned int status=0,addr;
+
+ addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+(high?GPIO_DATA_SET:GPIO_DATA_CLEAR);
+
+ status &= ~(1 << (pin %32));
+ status |= (1 << (pin % 32));
+ writel(status,addr);
+}
+
+/*
+ * pin = [0..63]
+ * mode =
+ * 1 -- OUT
+ * 2 -- IN
+ */
+void gpio_line_config(unsigned char pin, unsigned char mode)
+{
+ unsigned char set = pin >>5; // each GPIO set has 32 pins
+ unsigned int status,addr;
+
+ addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PIN_DIR;
+ status = readl(addr);
+
+ status &= ~(1 << (pin %32));
+ if (mode == 1)
+ status |= (1 << (pin % 32)); /* PinDir: 0 - input, 1 - output */
+
+ writel(status,addr);
+#if 0
+ /* enable pullup-high if mode is input */
+
+ addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PULL_ENABLE;
+ status = readl(addr);
+
+ status &= ~(1 << (pin %32));
+ if (mode == 2) /* input */
+ status |= (1 << (pin % 32)); /* PullEnable: 0 - disable, 1 - enable */
+
+ writel(status,addr);
+
+ addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PULL_TYPE;
+ status = readl(addr);
+
+ status &= ~(1 << (pin %32));
+ if (mode == 2) /* input */
+ status |= (1 << (pin % 32)); /* PullType: 0 - low, 1 - high */
+
+ writel(status,addr);
+#endif
+}
+
+#define GPIO_IS_OPEN 0x01 /* means /dev/gpio is in use */
+
+/*
+ * Now all the various file operations that we export.
+ */
+static int gpio_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct gpio_bit bit;
+ u32 val;
+
+ if (copy_from_user(&bit, (struct gpio_bit *)arg,
+ sizeof(bit)))
+ return -EFAULT;
+
+ switch (cmd) {
+
+ case GPIO_GET_BIT:
+ gpio_line_get(bit.bit, &val);
+ bit.state = val;
+ return copy_to_user((void *)arg, &bit, sizeof(bit)) ? -EFAULT : 0;
+ case GPIO_SET_BIT:
+ val = bit.state;
+ gpio_line_set(bit.bit, val);
+ return 0;
+ case GPIO_GET_CONFIG:
+ // gpio_line_config(bit.bit, bit.state);
+ return copy_to_user((void *)arg, &bit, sizeof(bit)) ? -EFAULT : 0;
+ case GPIO_SET_CONFIG:
+ val = bit.state;
+ gpio_line_config(bit.bit, bit.state);
+ return 0;
+ }
+ return -EINVAL;
+}
+
+
+static int gpio_open(struct inode *inode, struct file *file)
+{
+ if (gpio_status & GPIO_IS_OPEN)
+ return -EBUSY;
+
+ gpio_status |= GPIO_IS_OPEN;
+ return 0;
+}
+
+
+static int gpio_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Turn off all interrupts once the device is no longer
+ * in use and clear the data.
+ */
+
+ gpio_status &= ~GPIO_IS_OPEN;
+ return 0;
+}
+
+
+/*
+ * The various file operations we support.
+ */
+
+static struct file_operations gpio_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = gpio_ioctl,
+ .open = gpio_open,
+ .release = gpio_release,
+};
+
+static struct miscdevice gpio_dev =
+{
+ .minor = GPIO_MINOR,
+ .name = "gpio",
+ .fops = &gpio_fops,
+};
+
+
+
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *dir;
+
+/*
+ * Info exported via "/proc/driver/gpio".
+ */
+static int gpio_get_status(char *buf)
+{
+ char *p = buf;
+ u32 val = 0;
+ int i;
+ int bit;
+#ifdef DEBUG
+ u32 addr;
+
+ for (i = 0; i < 0x20; i+=4 ) {
+ addr = IO_ADDRESS(SL2312_GPIO_BASE) + i;
+ val = readl(addr);
+ p+=sprintf(p, "GPIO0: 0x%02X: %08X\n", i, val );
+ }
+ for (i = 0; i < 0x20; i+=4 ) {
+ addr = IO_ADDRESS(SL2312_GPIO_BASE1) + i;
+ val = readl(addr);
+ p+=sprintf(p, "GPIO1: 0x%02X: %08X\n", i, val );
+ }
+#endif
+
+ for (i = 0; i < 32; i++) {
+ gpio_line_get(i, &bit);
+ if (bit)
+ val |= (1 << i);
+ }
+ p += sprintf(p, "gpio0\t: 0x%08x\n", val);
+
+ val = 0;
+ for (i = 32; i < 64; i++) {
+ gpio_line_get(i, &bit);
+ if (bit)
+ val |= (1 << i);
+ }
+ p += sprintf(p, "gpio1\t: 0x%08x\n", val);
+
+ return p - buf;
+}
+
+
+/* /proc/driver/gpio read op
+ */
+static int gpio_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len = gpio_get_status (page);
+
+ if (len <= off+count)
+ *eof = 1;
+ *start = page + off;
+ len -= off;
+ if ( len > count )
+ len = count;
+ if ( len < 0 )
+ len = 0;
+ return len;
+}
+#endif /* CONFIG_PROC_FS */
+
+
+static int __init gpio_init_module(void)
+{
+ int retval;
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *res;
+#endif
+
+ /* register /dev/gpio file ops */
+ //retval = register_chrdev(GPIO_MAJOR, DEVICE_NAME, &gpio_fops);
+ retval = misc_register(&gpio_dev);
+ if(retval < 0)
+ return retval;
+
+#ifdef CONFIG_PROC_FS
+ dir = proc_mkdir("driver/gpio", NULL);
+ if (!dir) {
+ misc_deregister(&gpio_dev);
+ return -ENOMEM;
+ }
+ /* register /proc/driver/gpio */
+ res = create_proc_entry("info", 0644, dir);
+ if (res) {
+ res->read_proc= gpio_read_proc;
+ } else {
+ misc_deregister(&gpio_dev);
+ return -ENOMEM;
+ }
+#endif
+
+ printk("%s: GPIO driver loaded\n", __FILE__);
+
+ return 0;
+}
+
+static void __exit gpio_cleanup_module(void)
+{
+ remove_proc_entry ("info", dir);
+ misc_deregister(&gpio_dev);
+
+ printk("%s: GPIO driver unloaded\n", __FILE__);
+}
+
+module_init(gpio_init_module);
+module_exit(gpio_cleanup_module);
+
+MODULE_AUTHOR("Jonas Majauskas");
+MODULE_LICENSE("GPL");
+
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -1064,5 +1064,12 @@
source "drivers/s390/char/Kconfig"
+config GEMINI_GPIO_DEV
+ tristate "GPIO driver for Gemini board (provides /dev/gpio)"
+ depends on ARCH_SL2312
+ default n
+ help
+ GPIO driver for Gemini boards - SL3512, SL3516.
+
endmenu
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -115,6 +115,7 @@
obj-$(CONFIG_HANGCHECK_TIMER) += hangcheck-timer.o
obj-$(CONFIG_TCG_TPM) += tpm/
+obj-$(CONFIG_GEMINI_GPIO_DEV) += gemini_gpio_dev.o
obj-$(CONFIG_PS3_FLASH) += ps3flash.o
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