drivers/video/fbdev/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/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/delay.h>
  16 #include <linux/gfp.h>
  17 #include <linux/pci.h>
  18 #include <linux/fb.h>
  19
  20 #include <asm/io.h>
  21 #include "savagefb.h"
  22
  23 #define SAVAGE_DDC      0x50
  24
  25 #define VGA_CR_IX       0x3d4
  26 #define VGA_CR_DATA     0x3d5
  27
  28 #define CR_SERIAL1      0xa0    /* I2C serial communications interface */
  29 #define MM_SERIAL1      0xff20
  30 #define CR_SERIAL2      0xb1    /* DDC2 monitor communications interface */
  31
  32 /* based on vt8365 documentation */
  33 #define PROSAVAGE_I2C_ENAB      0x10
  34 #define PROSAVAGE_I2C_SCL_OUT   0x01
  35 #define PROSAVAGE_I2C_SDA_OUT   0x02
  36 #define PROSAVAGE_I2C_SCL_IN    0x04
  37 #define PROSAVAGE_I2C_SDA_IN    0x08
  38
  39 #define SAVAGE4_I2C_ENAB        0x00000020
  40 #define SAVAGE4_I2C_SCL_OUT     0x00000001
  41 #define SAVAGE4_I2C_SDA_OUT     0x00000002
  42 #define SAVAGE4_I2C_SCL_IN      0x00000008
  43 #define SAVAGE4_I2C_SDA_IN      0x00000010
  44
  45 static void savage4_gpio_setscl(void *data, int val)
  46 {
  47         struct savagefb_i2c_chan *chan = data;
  48         unsigned int r;
  49
  50         r = readl(chan->ioaddr + chan->reg);
  51         if(val)
  52                 r |= SAVAGE4_I2C_SCL_OUT;
  53         else
  54                 r &= ~SAVAGE4_I2C_SCL_OUT;
  55         writel(r, chan->ioaddr + chan->reg);
  56         readl(chan->ioaddr + chan->reg);        /* flush posted write */
  57 }
  58
  59 static void savage4_gpio_setsda(void *data, int val)
  60 {
  61         struct savagefb_i2c_chan *chan = data;
  62
  63         unsigned int r;
  64         r = readl(chan->ioaddr + chan->reg);
  65         if(val)
  66                 r |= SAVAGE4_I2C_SDA_OUT;
  67         else
  68                 r &= ~SAVAGE4_I2C_SDA_OUT;
  69         writel(r, chan->ioaddr + chan->reg);
  70         readl(chan->ioaddr + chan->reg);        /* flush posted write */
  71 }
  72
  73 static int savage4_gpio_getscl(void *data)
  74 {
  75         struct savagefb_i2c_chan *chan = data;
  76
  77         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
  78 }
  79
  80 static int savage4_gpio_getsda(void *data)
  81 {
  82         struct savagefb_i2c_chan *chan = data;
  83
  84         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
  85 }
  86
  87 static void prosavage_gpio_setscl(void* data, int val)
  88 {
  89         struct savagefb_i2c_chan *chan = data;
  90         u32                       r;
  91
  92         r = VGArCR(chan->reg, chan->par);
  93         r |= PROSAVAGE_I2C_ENAB;
  94         if (val) {
  95                 r |= PROSAVAGE_I2C_SCL_OUT;
  96         } else {
  97                 r &= ~PROSAVAGE_I2C_SCL_OUT;
  98         }
  99
 100         VGAwCR(chan->reg, r, chan->par);
 101 }
 102
 103 static void prosavage_gpio_setsda(void* data, int val)
 104 {
 105         struct savagefb_i2c_chan *chan = data;
 106         unsigned int r;
 107
 108         r = VGArCR(chan->reg, chan->par);
 109         r |= PROSAVAGE_I2C_ENAB;
 110         if (val) {
 111                 r |= PROSAVAGE_I2C_SDA_OUT;
 112         } else {
 113                 r &= ~PROSAVAGE_I2C_SDA_OUT;
 114         }
 115
 116         VGAwCR(chan->reg, r, chan->par);
 117 }
 118
 119 static int prosavage_gpio_getscl(void* data)
 120 {
 121         struct savagefb_i2c_chan *chan = data;
 122
 123         return (VGArCR(chan->reg, chan->par) & PROSAVAGE_I2C_SCL_IN) ? 1 : 0;
 124 }
 125
 126 static int prosavage_gpio_getsda(void* data)
 127 {
 128         struct savagefb_i2c_chan *chan = data;
 129
 130         return (VGArCR(chan->reg, chan->par) & PROSAVAGE_I2C_SDA_IN) ? 1 : 0;
 131 }
 132
 133 static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
 134                                 const char *name)
 135 {
 136         int rc = 0;
 137
 138         if (chan->par) {
 139                 strcpy(chan->adapter.name, name);
 140                 chan->adapter.owner             = THIS_MODULE;
 141                 chan->adapter.algo_data         = &chan->algo;
 142                 chan->adapter.dev.parent        = &chan->par->pcidev->dev;
 143                 chan->algo.udelay               = 10;
 144                 chan->algo.timeout              = 20;
 145                 chan->algo.data                 = chan;
 146
 147                 i2c_set_adapdata(&chan->adapter, chan);
 148
 149                 /* Raise SCL and SDA */
 150                 chan->algo.setsda(chan, 1);
 151                 chan->algo.setscl(chan, 1);
 152                 udelay(20);
 153
 154                 rc = i2c_bit_add_bus(&chan->adapter);
 155
 156                 if (rc == 0)
 157                         dev_dbg(&chan->par->pcidev->dev,
 158                                 "I2C bus %s registered.\n", name);
 159                 else
 160                         dev_warn(&chan->par->pcidev->dev,
 161                                  "Failed to register I2C bus %s.\n", name);
 162         }
 163
 164         return rc;
 165 }
 166
 167 void savagefb_create_i2c_busses(struct fb_info *info)
 168 {
 169         struct savagefb_par *par = info->par;
 170         par->chan.par   = par;
 171
 172         switch (par->chip) {
 173         case S3_PROSAVAGE:
 174         case S3_PROSAVAGEDDR:
 175         case S3_TWISTER:
 176                 par->chan.reg         = CR_SERIAL2;
 177                 par->chan.ioaddr      = par->mmio.vbase;
 178                 par->chan.algo.setsda = prosavage_gpio_setsda;
 179                 par->chan.algo.setscl = prosavage_gpio_setscl;
 180                 par->chan.algo.getsda = prosavage_gpio_getsda;
 181                 par->chan.algo.getscl = prosavage_gpio_getscl;
 182                 break;
 183         case S3_SAVAGE4:
 184                 par->chan.reg = CR_SERIAL1;
 185                 if (par->pcidev->revision > 1 && !(VGArCR(0xa6, par) & 0x40))
 186                         par->chan.reg = CR_SERIAL2;
 187                 par->chan.ioaddr      = par->mmio.vbase;
 188                 par->chan.algo.setsda = prosavage_gpio_setsda;
 189                 par->chan.algo.setscl = prosavage_gpio_setscl;
 190                 par->chan.algo.getsda = prosavage_gpio_getsda;
 191                 par->chan.algo.getscl = prosavage_gpio_getscl;
 192                 break;
 193         case S3_SAVAGE2000:
 194                 par->chan.reg         = MM_SERIAL1;
 195                 par->chan.ioaddr      = par->mmio.vbase;
 196                 par->chan.algo.setsda = savage4_gpio_setsda;
 197                 par->chan.algo.setscl = savage4_gpio_setscl;
 198                 par->chan.algo.getsda = savage4_gpio_getsda;
 199                 par->chan.algo.getscl = savage4_gpio_getscl;
 200                 break;
 201         default:
 202                 par->chan.par = NULL;
 203         }
 204
 205         savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
 206 }
 207
 208 void savagefb_delete_i2c_busses(struct fb_info *info)
 209 {
 210         struct savagefb_par *par = info->par;
 211
 212         if (par->chan.par)
 213                 i2c_del_adapter(&par->chan.adapter);
 214
 215         par->chan.par = NULL;
 216 }
 217
 218 int savagefb_probe_i2c_connector(struct fb_info *info, u8 **out_edid)
 219 {
 220         struct savagefb_par *par = info->par;
 221         u8 *edid;
 222
 223         if (par->chan.par)
 224                 edid = fb_ddc_read(&par->chan.adapter);
 225         else
 226                 edid = NULL;
 227
 228         if (!edid) {
 229                 /* try to get from firmware */
 230                 const u8 *e = fb_firmware_edid(info->device);
 231
 232                 if (e)
 233                         edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
 234         }
 235
 236         *out_edid = edid;
 237
 238         return (edid) ? 0 : 1;
 239 }
 240
 241 MODULE_LICENSE("GPL");