path: root/target/linux/storm/patches/1100-gpio.patch

--- /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
@@ -1071,5 +1071,12 @@ config DEVPORT
 
 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
@@ -116,6 +116,7 @@ obj-$(CONFIG_IPMI_HANDLER)	+= ipmi/
 
 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