target/linux/storm/patches/1100-gpio.patch

   1 --- /dev/null
   2 +++ b/drivers/char/gemini_gpio_dev.c
   3 @@ -0,0 +1,356 @@
   4 +/*
   5 + *     GPIO driver for Gemini board
   6 + *     Provides /dev/gpio
   7 + */
   8 +
   9 +#include <linux/version.h>
  10 +#include <linux/kernel.h>
  11 +#include <linux/module.h>
  12 +#include <linux/init.h>
  13 +#include <linux/proc_fs.h>
  14 +#include <linux/fcntl.h>
  15 +#include <linux/miscdevice.h>
  16 +#include <asm/uaccess.h>       /* copy_to_user, copy_from_user */
  17 +
  18 +#include <asm/hardware.h>
  19 +#include <asm/io.h>
  20 +#include <asm/arch/sl2312.h>
  21 +#include <asm/arch/irqs.h>
  22 +#include <asm/arch/gemini_gpio.h>
  23 +
  24 +#define GEMINI_GPIO_BASE1              IO_ADDRESS(SL2312_GPIO_BASE)
  25 +#define GEMINI_GPIO_BASE2              IO_ADDRESS(SL2312_GPIO_BASE1)
  26 +
  27 +#define GPIO_SET       2
  28 +#define MAX_GPIO_LINE  32*GPIO_SET
  29 +
  30 +wait_queue_head_t gemini_gpio_wait[MAX_GPIO_LINE];
  31 +
  32 +enum GPIO_REG
  33 +{
  34 +    GPIO_DATA_OUT              = 0x00,
  35 +    GPIO_DATA_IN               = 0x04,
  36 +    GPIO_PIN_DIR               = 0x08,
  37 +    GPIO_BY_PASS               = 0x0C,
  38 +    GPIO_DATA_SET              = 0x10,
  39 +    GPIO_DATA_CLEAR            = 0x14,
  40 +    GPIO_PULL_ENABLE           = 0x18,
  41 +    GPIO_PULL_TYPE                     = 0x1C,
  42 +    GPIO_INT_ENABLE            = 0x20,
  43 +    GPIO_INT_RAW_STATUS        = 0x24,
  44 +    GPIO_INT_MASK_STATUS       = 0x28,
  45 +    GPIO_INT_MASK                      = 0x2C,
  46 +    GPIO_INT_CLEAR                     = 0x30,
  47 +    GPIO_INT_TRIG                      = 0x34,
  48 +    GPIO_INT_BOTH                      = 0x38,
  49 +    GPIO_INT_POLAR                     = 0x3C
  50 +};
  51 +
  52 +unsigned int regist_gpio_int0=0,regist_gpio_int1=0;
  53 +
  54 +/* defines a specific GPIO bit number and state */
  55 +struct gpio_bit {
  56 +       unsigned char bit;
  57 +       unsigned char state;
  58 +};
  59 +
  60 +#define GPIO_MAJOR    10
  61 +#define GPIO_MINOR    127
  62 +
  63 +/*
  64 + * ioctl calls that are permitted to the /dev/gpio interface
  65 + */
  66 +#define GPIO_GET_BIT   0x0000001
  67 +#define GPIO_SET_BIT   0x0000002
  68 +#define GPIO_GET_CONFIG        0x0000003
  69 +#define GPIO_SET_CONFIG 0x0000004
  70 +
  71 +//#define GPIO_CONFIG_OUT  1
  72 +//#define GPIO_CONFIG_IN   2
  73 +
  74 +
  75 +
  76 +#define DEVICE_NAME "gpio"
  77 +
  78 +//#define DEBUG
  79 +
  80 +/*
  81 + * GPIO interface
  82 + */
  83 +
  84 +/* /dev/gpio */
  85 +static int gpio_ioctl(struct inode *inode, struct file *file,
  86 +                     unsigned int cmd, unsigned long arg);
  87 +
  88 +/* /proc/driver/gpio */
  89 +static int gpio_read_proc(char *page, char **start, off_t off,
  90 +                         int count, int *eof, void *data);
  91 +
  92 +static unsigned char gpio_status;        /* bitmapped status byte.       */
  93 +
  94 +/* functions for set/get gpio lines on storlink cpu */
  95 +
  96 +void gpio_line_get(unsigned char pin, u32 * data)
  97 +{
  98 +       unsigned int set = pin >>5;             // each GPIO set has 32 pins
  99 +       unsigned int status,addr;
 100 +
 101 +       addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1) + GPIO_DATA_IN;
 102 +       status = readl(addr);
 103 +#ifdef DEBUG
 104 +       printk("status = %08X, pin = %d, set = %d\n", status, pin, set);
 105 +#endif
 106 +       if (set)
 107 +                       *data = (status&(1<<(pin-32)))?1:0;
 108 +       else
 109 +                       *data = (status&(1<<pin))?1:0;
 110 +}
 111 +
 112 +void gpio_line_set(unsigned char pin, u32 high)
 113 +{
 114 +       unsigned char set = pin >>5;            // each GPIO set has 32 pins
 115 +       unsigned int status=0,addr;
 116 +
 117 +       addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+(high?GPIO_DATA_SET:GPIO_DATA_CLEAR);
 118 +
 119 +       status &= ~(1 << (pin %32));
 120 +       status |= (1 << (pin % 32));
 121 +       writel(status,addr);
 122 +}
 123 +
 124 +/*
 125 + * pin = [0..63]
 126 + * mode =
 127 + *                     1 -- OUT
 128 + *                     2 -- IN
 129 + */
 130 +void gpio_line_config(unsigned char pin, unsigned char mode)
 131 +{
 132 +       unsigned char set = pin >>5;            // each GPIO set has 32 pins
 133 +       unsigned int status,addr;
 134 +
 135 +       addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PIN_DIR;
 136 +       status = readl(addr);
 137 +
 138 +       status &= ~(1 << (pin %32));
 139 +       if (mode == 1)
 140 +                       status |= (1 << (pin % 32)); /* PinDir: 0 - input, 1 - output */
 141 +
 142 +       writel(status,addr);
 143 +#if 0
 144 +       /* enable pullup-high if mode is input */
 145 +
 146 +       addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PULL_ENABLE;
 147 +       status = readl(addr);
 148 +
 149 +       status &= ~(1 << (pin %32));
 150 +       if (mode == 2) /* input */
 151 +                       status |= (1 << (pin % 32)); /* PullEnable: 0 - disable, 1 - enable */
 152 +
 153 +       writel(status,addr);
 154 +
 155 +       addr = (set ? GEMINI_GPIO_BASE2:GEMINI_GPIO_BASE1)+GPIO_PULL_TYPE;
 156 +       status = readl(addr);
 157 +
 158 +       status &= ~(1 << (pin %32));
 159 +       if (mode == 2) /* input */
 160 +                       status |= (1 << (pin % 32)); /* PullType: 0 - low, 1 - high */
 161 +
 162 +       writel(status,addr);
 163 +#endif
 164 +}
 165 +
 166 +#define GPIO_IS_OPEN             0x01    /* means /dev/gpio is in use     */
 167 +
 168 +/*
 169 + *      Now all the various file operations that we export.
 170 + */
 171 +static int gpio_ioctl(struct inode *inode, struct file *file,
 172 +                         unsigned int cmd, unsigned long arg)
 173 +{
 174 +               struct gpio_bit bit;
 175 +               u32 val;
 176 +
 177 +               if (copy_from_user(&bit, (struct gpio_bit *)arg,
 178 +                                                               sizeof(bit)))
 179 +                               return -EFAULT;
 180 +
 181 +               switch (cmd) {
 182 +
 183 +                               case GPIO_GET_BIT:
 184 +                                               gpio_line_get(bit.bit, &val);
 185 +                                               bit.state = val;
 186 +                                               return copy_to_user((void *)arg, &bit, sizeof(bit)) ? -EFAULT : 0;
 187 +                               case GPIO_SET_BIT:
 188 +                                               val = bit.state;
 189 +                                               gpio_line_set(bit.bit, val);
 190 +                                               return 0;
 191 +                               case GPIO_GET_CONFIG:
 192 +                                               // gpio_line_config(bit.bit, bit.state);
 193 +                                               return copy_to_user((void *)arg, &bit, sizeof(bit)) ? -EFAULT : 0;
 194 +                               case GPIO_SET_CONFIG:
 195 +                                               val = bit.state;
 196 +                                               gpio_line_config(bit.bit, bit.state);
 197 +                                               return 0;
 198 +               }
 199 +               return -EINVAL;
 200 +}
 201 +
 202 +
 203 +static int gpio_open(struct inode *inode, struct file *file)
 204 +{
 205 +        if (gpio_status & GPIO_IS_OPEN)
 206 +                return -EBUSY;
 207 +
 208 +        gpio_status |= GPIO_IS_OPEN;
 209 +        return 0;
 210 +}
 211 +
 212 +
 213 +static int gpio_release(struct inode *inode, struct file *file)
 214 +{
 215 +        /*
 216 +         * Turn off all interrupts once the device is no longer
 217 +         * in use and clear the data.
 218 +         */
 219 +
 220 +        gpio_status &= ~GPIO_IS_OPEN;
 221 +        return 0;
 222 +}
 223 +
 224 +
 225 +/*
 226 + *      The various file operations we support.
 227 + */
 228 +
 229 +static struct file_operations gpio_fops = {
 230 +        .owner          = THIS_MODULE,
 231 +        .ioctl          = gpio_ioctl,
 232 +        .open           = gpio_open,
 233 +        .release        = gpio_release,
 234 +};
 235 +
 236 +static struct miscdevice gpio_dev =
 237 +{
 238 +        .minor          = GPIO_MINOR,
 239 +        .name           = "gpio",
 240 +        .fops           = &gpio_fops,
 241 +};
 242 +
 243 +
 244 +
 245 +
 246 +#ifdef CONFIG_PROC_FS
 247 +static struct proc_dir_entry *dir;
 248 +
 249 +/*
 250 + *      Info exported via "/proc/driver/gpio".
 251 + */
 252 +static int gpio_get_status(char *buf)
 253 +{
 254 +    char *p = buf;
 255 +       u32 val = 0;
 256 +       int i;
 257 +       int bit;
 258 +#ifdef DEBUG
 259 +       u32 addr;
 260 +
 261 +       for (i = 0; i < 0x20; i+=4 ) {
 262 +                       addr = IO_ADDRESS(SL2312_GPIO_BASE) + i;
 263 +                       val = readl(addr);
 264 +                       p+=sprintf(p, "GPIO0: 0x%02X: %08X\n", i, val );
 265 +       }
 266 +       for (i = 0; i < 0x20; i+=4 ) {
 267 +                       addr = IO_ADDRESS(SL2312_GPIO_BASE1) + i;
 268 +                       val = readl(addr);
 269 +                       p+=sprintf(p, "GPIO1: 0x%02X: %08X\n", i, val );
 270 +       }
 271 +#endif
 272 +
 273 +       for (i = 0; i < 32; i++) {
 274 +                       gpio_line_get(i, &bit);
 275 +                       if (bit)
 276 +                                       val |= (1 << i);
 277 +       }
 278 +       p += sprintf(p, "gpio0\t: 0x%08x\n", val);
 279 +
 280 +       val = 0;
 281 +       for (i = 32; i < 64; i++) {
 282 +                       gpio_line_get(i, &bit);
 283 +                       if (bit)
 284 +                                       val |= (1 << i);
 285 +       }
 286 +       p += sprintf(p, "gpio1\t: 0x%08x\n", val);
 287 +
 288 +       return p - buf;
 289 +}
 290 +
 291 +
 292 +/* /proc/driver/gpio read op
 293 + */
 294 +static int gpio_read_proc(char *page, char **start, off_t off,
 295 +                             int count, int *eof, void *data)
 296 +{
 297 +        int len = gpio_get_status (page);
 298 +
 299 +        if (len <= off+count)
 300 +                       *eof = 1;
 301 +        *start = page + off;
 302 +        len -= off;
 303 +        if ( len > count )
 304 +                       len = count;
 305 +        if ( len < 0 )
 306 +                       len = 0;
 307 +        return len;
 308 +}
 309 +#endif /* CONFIG_PROC_FS */
 310 +
 311 +
 312 +static int __init gpio_init_module(void)
 313 +{
 314 +        int retval;
 315 +#ifdef CONFIG_PROC_FS
 316 +       struct proc_dir_entry *res;
 317 +#endif
 318 +
 319 +        /* register /dev/gpio file ops */
 320 +       //retval = register_chrdev(GPIO_MAJOR, DEVICE_NAME, &gpio_fops);
 321 +       retval = misc_register(&gpio_dev);
 322 +        if(retval < 0)
 323 +                return retval;
 324 +
 325 +#ifdef CONFIG_PROC_FS
 326 +       dir = proc_mkdir("driver/gpio", NULL);
 327 +       if (!dir) {
 328 +               misc_deregister(&gpio_dev);
 329 +               return -ENOMEM;
 330 +       }
 331 +        /* register /proc/driver/gpio */
 332 +       res = create_proc_entry("info", 0644, dir);
 333 +       if (res) {
 334 +               res->read_proc= gpio_read_proc;
 335 +       } else {
 336 +               misc_deregister(&gpio_dev);
 337 +               return -ENOMEM;
 338 +       }
 339 +#endif
 340 +
 341 +       printk("%s: GPIO driver loaded\n", __FILE__);
 342 +
 343 +       return 0;
 344 +}
 345 +
 346 +static void __exit gpio_cleanup_module(void)
 347 +{
 348 +       remove_proc_entry ("info", dir);
 349 +        misc_deregister(&gpio_dev);
 350 +
 351 +       printk("%s: GPIO driver unloaded\n", __FILE__);
 352 +}
 353 +
 354 +module_init(gpio_init_module);
 355 +module_exit(gpio_cleanup_module);
 356 +
 357 +MODULE_AUTHOR("Jonas Majauskas");
 358 +MODULE_LICENSE("GPL");
 359 +
 360 --- a/drivers/char/Kconfig
 361 +++ b/drivers/char/Kconfig
 362 @@ -1071,5 +1071,12 @@ config DEVPORT
 363
 364  source "drivers/s390/char/Kconfig"
 365
 366 +config GEMINI_GPIO_DEV
 367 +       tristate "GPIO driver for Gemini board (provides /dev/gpio)"
 368 +       depends on ARCH_SL2312
 369 +       default n
 370 +       help
 371 +         GPIO driver for Gemini boards - SL3512, SL3516.
 372 +
 373  endmenu
 374
 375 --- a/drivers/char/Makefile
 376 +++ b/drivers/char/Makefile
 377 @@ -116,6 +116,7 @@ obj-$(CONFIG_IPMI_HANDLER)  += ipmi/
 378
 379  obj-$(CONFIG_HANGCHECK_TIMER)  += hangcheck-timer.o
 380  obj-$(CONFIG_TCG_TPM)          += tpm/
 381 +obj-$(CONFIG_GEMINI_GPIO_DEV)          += gemini_gpio_dev.o
 382
 383  obj-$(CONFIG_PS3_FLASH)                += ps3flash.o
 384