drivers/video/savage/savagefb-i2c.c

   1 /*
   2  * linux/drivers/video/savage/savagefb-i2c.c - S3 Savage DDC2
   3  *
   4  * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
   5  *
   6  * Based partly on rivafb-i2c.c
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/fb.h>
  20
  21 #include <asm/io.h>
  22 #include "savagefb.h"
  23
  24 #define SAVAGE_DDC      0x50
  25
  26 #define VGA_CR_IX       0x3d4
  27 #define VGA_CR_DATA     0x3d5
  28
  29 #define CR_SERIAL1      0xa0    /* I2C serial communications interface */
  30 #define MM_SERIAL1      0xff20
  31 #define CR_SERIAL2      0xb1    /* DDC2 monitor communications interface */
  32
  33 /* based on vt8365 documentation */
  34 #define PROSAVAGE_I2C_ENAB      0x10
  35 #define PROSAVAGE_I2C_SCL_OUT   0x01
  36 #define PROSAVAGE_I2C_SDA_OUT   0x02
  37 #define PROSAVAGE_I2C_SCL_IN    0x04
  38 #define PROSAVAGE_I2C_SDA_IN    0x08
  39
  40 #define SAVAGE4_I2C_ENAB        0x00000020
  41 #define SAVAGE4_I2C_SCL_OUT     0x00000001
  42 #define SAVAGE4_I2C_SDA_OUT     0x00000002
  43 #define SAVAGE4_I2C_SCL_IN      0x00000008
  44 #define SAVAGE4_I2C_SDA_IN      0x00000010
  45
  46 #define SET_CR_IX(base, val)    writeb((val), base + 0x8000 + VGA_CR_IX)
  47 #define SET_CR_DATA(base, val)  writeb((val), base + 0x8000 + VGA_CR_DATA)
  48 #define GET_CR_DATA(base)       readb(base + 0x8000 + VGA_CR_DATA)
  49
  50 static void savage4_gpio_setscl(void *data, int val)
  51 {
  52         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
  53         unsigned int r;
  54
  55         r = readl(chan->ioaddr + chan->reg);
  56         if(val)
  57                 r |= SAVAGE4_I2C_SCL_OUT;
  58         else
  59                 r &= ~SAVAGE4_I2C_SCL_OUT;
  60         writel(r, chan->ioaddr + chan->reg);
  61         readl(chan->ioaddr + chan->reg);        /* flush posted write */
  62 }
  63
  64 static void savage4_gpio_setsda(void *data, int val)
  65 {
  66         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
  67
  68         unsigned int r;
  69         r = readl(chan->ioaddr + chan->reg);
  70         if(val)
  71                 r |= SAVAGE4_I2C_SDA_OUT;
  72         else
  73                 r &= ~SAVAGE4_I2C_SDA_OUT;
  74         writel(r, chan->ioaddr + chan->reg);
  75         readl(chan->ioaddr + chan->reg);        /* flush posted write */
  76 }
  77
  78 static int savage4_gpio_getscl(void *data)
  79 {
  80         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
  81
  82         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
  83 }
  84
  85 static int savage4_gpio_getsda(void *data)
  86 {
  87         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
  88
  89         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
  90 }
  91
  92 static void prosavage_gpio_setscl(void* data, int val)
  93 {
  94         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
  95         u32                       r;
  96
  97         SET_CR_IX(chan->ioaddr, chan->reg);
  98         r = GET_CR_DATA(chan->ioaddr);
  99         r |= PROSAVAGE_I2C_ENAB;
 100         if (val) {
 101                 r |= PROSAVAGE_I2C_SCL_OUT;
 102         } else {
 103                 r &= ~PROSAVAGE_I2C_SCL_OUT;
 104         }
 105         SET_CR_DATA(chan->ioaddr, r);
 106 }
 107
 108 static void prosavage_gpio_setsda(void* data, int val)
 109 {
 110         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
 111         unsigned int r;
 112
 113         SET_CR_IX(chan->ioaddr, chan->reg);
 114         r = GET_CR_DATA(chan->ioaddr);
 115         r |= PROSAVAGE_I2C_ENAB;
 116         if (val) {
 117                 r |= PROSAVAGE_I2C_SDA_OUT;
 118         } else {
 119                 r &= ~PROSAVAGE_I2C_SDA_OUT;
 120         }
 121         SET_CR_DATA(chan->ioaddr, r);
 122 }
 123
 124 static int prosavage_gpio_getscl(void* data)
 125 {
 126         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
 127
 128         SET_CR_IX(chan->ioaddr, chan->reg);
 129         return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SCL_IN));
 130 }
 131
 132 static int prosavage_gpio_getsda(void* data)
 133 {
 134         struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
 135
 136         SET_CR_IX(chan->ioaddr, chan->reg);
 137         return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SDA_IN));
 138 }
 139
 140 #define I2C_ALGO_SAVAGE   0x0f0000
 141 static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
 142                                 const char *name)
 143 {
 144         int (*add_bus)(struct i2c_adapter *) = symbol_get(i2c_bit_add_bus);
 145         int rc = 0;
 146
 147         if (add_bus && chan->par) {
 148                 strcpy(chan->adapter.name, name);
 149                 chan->adapter.owner             = THIS_MODULE;
 150                 chan->adapter.id                = I2C_ALGO_SAVAGE;
 151                 chan->adapter.algo_data         = &chan->algo;
 152                 chan->adapter.dev.parent        = &chan->par->pcidev->dev;
 153                 chan->algo.udelay               = 40;
 154                 chan->algo.mdelay               = 5;
 155                 chan->algo.timeout              = 20;
 156                 chan->algo.data                 = chan;
 157
 158                 i2c_set_adapdata(&chan->adapter, chan);
 159
 160                 /* Raise SCL and SDA */
 161                 chan->algo.setsda(chan, 1);
 162                 chan->algo.setscl(chan, 1);
 163                 udelay(20);
 164
 165                 rc = add_bus(&chan->adapter);
 166
 167                 if (rc == 0)
 168                         dev_dbg(&chan->par->pcidev->dev,
 169                                 "I2C bus %s registered.\n", name);
 170                 else
 171                         dev_warn(&chan->par->pcidev->dev,
 172                                  "Failed to register I2C bus %s.\n", name);
 173
 174                 symbol_put(i2c_bit_add_bus);
 175         } else
 176                 chan->par = NULL;
 177
 178         return rc;
 179 }
 180
 181 void savagefb_create_i2c_busses(struct fb_info *info)
 182 {
 183         struct savagefb_par *par = (struct savagefb_par *)info->par;
 184         par->chan.par   = par;
 185
 186         switch(info->fix.accel) {
 187         case FB_ACCEL_PROSAVAGE_DDRK:
 188         case FB_ACCEL_PROSAVAGE_PM:
 189                 par->chan.reg         = CR_SERIAL2;
 190                 par->chan.ioaddr      = par->mmio.vbase;
 191                 par->chan.algo.setsda = prosavage_gpio_setsda;
 192                 par->chan.algo.setscl = prosavage_gpio_setscl;
 193                 par->chan.algo.getsda = prosavage_gpio_getsda;
 194                 par->chan.algo.getscl = prosavage_gpio_getscl;
 195                 break;
 196         case FB_ACCEL_SAVAGE4:
 197                 par->chan.reg         = 0xff20;
 198                 par->chan.ioaddr      = par->mmio.vbase;
 199                 par->chan.algo.setsda = savage4_gpio_setsda;
 200                 par->chan.algo.setscl = savage4_gpio_setscl;
 201                 par->chan.algo.getsda = savage4_gpio_getsda;
 202                 par->chan.algo.getscl = savage4_gpio_getscl;
 203                 break;
 204         default:
 205                 par->chan.par = NULL;
 206         }
 207
 208         savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
 209 }
 210
 211 void savagefb_delete_i2c_busses(struct fb_info *info)
 212 {
 213         struct savagefb_par *par = (struct savagefb_par *)info->par;
 214         int (*del_bus)(struct i2c_adapter *) =
 215                 symbol_get(i2c_bit_del_bus);
 216
 217         if (del_bus && par->chan.par) {
 218                 del_bus(&par->chan.adapter);
 219                 symbol_put(i2c_bit_del_bus);
 220         }
 221
 222         par->chan.par = NULL;
 223 }
 224
 225 static u8 *savage_do_probe_i2c_edid(struct savagefb_i2c_chan *chan)
 226 {
 227         u8 start = 0x0;
 228         int (*transfer)(struct i2c_adapter *, struct i2c_msg *, int) =
 229                 symbol_get(i2c_transfer);
 230         struct i2c_msg msgs[] = {
 231                 {
 232                         .addr   = SAVAGE_DDC,
 233                         .len    = 1,
 234                         .buf    = &start,
 235                 }, {
 236                         .addr   = SAVAGE_DDC,
 237                         .flags  = I2C_M_RD,
 238                         .len    = EDID_LENGTH,
 239                 },
 240         };
 241         u8 *buf = NULL;
 242
 243         if (transfer && chan->par) {
 244                 buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
 245
 246                 if (buf) {
 247                         msgs[1].buf = buf;
 248
 249                         if (transfer(&chan->adapter, msgs, 2) != 2) {
 250                                 dev_dbg(&chan->par->pcidev->dev,
 251                                         "Unable to read EDID block.\n");
 252                                 kfree(buf);
 253                                 buf = NULL;
 254                         }
 255                 }
 256
 257                 symbol_put(i2c_transfer);
 258         }
 259
 260         return buf;
 261 }
 262
 263 int savagefb_probe_i2c_connector(struct savagefb_par *par, u8 **out_edid)
 264 {
 265         u8 *edid = NULL;
 266         int i;
 267
 268         for (i = 0; i < 3; i++) {
 269                 /* Do the real work */
 270                 edid = savage_do_probe_i2c_edid(&par->chan);
 271                 if (edid)
 272                         break;
 273         }
 274         if (out_edid)
 275                 *out_edid = edid;
 276         if (!edid)
 277                 return 1;
 278
 279         return 0;
 280 }
 281
 282 MODULE_LICENSE("GPL");