drivers/video/aty/radeon_i2c.c

   1 #include <linux/config.h>
   2 #include <linux/module.h>
   3 #include <linux/kernel.h>
   4 #include <linux/sched.h>
   5 #include <linux/delay.h>
   6 #include <linux/pci.h>
   7 #include <linux/fb.h>
   8
   9
  10 #include <linux/i2c.h>
  11 #include <linux/i2c-id.h>
  12 #include <linux/i2c-algo-bit.h>
  13
  14 #include <asm/io.h>
  15
  16 #include <video/radeon.h>
  17 #include "radeonfb.h"
  18 #include "../edid.h"
  19
  20 #define RADEON_DDC      0x50
  21
  22 static void radeon_gpio_setscl(void* data, int state)
  23 {
  24         struct radeon_i2c_chan  *chan = data;
  25         struct radeonfb_info    *rinfo = chan->rinfo;
  26         u32                     val;
  27
  28         val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
  29         if (!state)
  30                 val |= VGA_DDC_CLK_OUT_EN;
  31
  32         OUTREG(chan->ddc_reg, val);
  33         (void)INREG(chan->ddc_reg);
  34 }
  35
  36 static void radeon_gpio_setsda(void* data, int state)
  37 {
  38         struct radeon_i2c_chan  *chan = data;
  39         struct radeonfb_info    *rinfo = chan->rinfo;
  40         u32                     val;
  41
  42         val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
  43         if (!state)
  44                 val |= VGA_DDC_DATA_OUT_EN;
  45
  46         OUTREG(chan->ddc_reg, val);
  47         (void)INREG(chan->ddc_reg);
  48 }
  49
  50 static int radeon_gpio_getscl(void* data)
  51 {
  52         struct radeon_i2c_chan  *chan = data;
  53         struct radeonfb_info    *rinfo = chan->rinfo;
  54         u32                     val;
  55
  56         val = INREG(chan->ddc_reg);
  57
  58         return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
  59 }
  60
  61 static int radeon_gpio_getsda(void* data)
  62 {
  63         struct radeon_i2c_chan  *chan = data;
  64         struct radeonfb_info    *rinfo = chan->rinfo;
  65         u32                     val;
  66
  67         val = INREG(chan->ddc_reg);
  68
  69         return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
  70 }
  71
  72 static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
  73 {
  74         int rc;
  75
  76         strcpy(chan->adapter.name, name);
  77         chan->adapter.owner             = THIS_MODULE;
  78         chan->adapter.id                = I2C_HW_B_RADEON;
  79         chan->adapter.algo_data         = &chan->algo;
  80         chan->adapter.dev.parent        = &chan->rinfo->pdev->dev;
  81         chan->algo.setsda               = radeon_gpio_setsda;
  82         chan->algo.setscl               = radeon_gpio_setscl;
  83         chan->algo.getsda               = radeon_gpio_getsda;
  84         chan->algo.getscl               = radeon_gpio_getscl;
  85         chan->algo.udelay               = 40;
  86         chan->algo.timeout              = 20;
  87         chan->algo.data                 = chan;
  88
  89         i2c_set_adapdata(&chan->adapter, chan);
  90
  91         /* Raise SCL and SDA */
  92         radeon_gpio_setsda(chan, 1);
  93         radeon_gpio_setscl(chan, 1);
  94         udelay(20);
  95
  96         rc = i2c_bit_add_bus(&chan->adapter);
  97         if (rc == 0)
  98                 dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
  99         else
 100                 dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
 101         return rc;
 102 }
 103
 104 void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
 105 {
 106         rinfo->i2c[0].rinfo     = rinfo;
 107         rinfo->i2c[0].ddc_reg   = GPIO_MONID;
 108         radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
 109
 110         rinfo->i2c[1].rinfo     = rinfo;
 111         rinfo->i2c[1].ddc_reg   = GPIO_DVI_DDC;
 112         radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
 113
 114         rinfo->i2c[2].rinfo     = rinfo;
 115         rinfo->i2c[2].ddc_reg   = GPIO_VGA_DDC;
 116         radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
 117
 118         rinfo->i2c[3].rinfo     = rinfo;
 119         rinfo->i2c[3].ddc_reg   = GPIO_CRT2_DDC;
 120         radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
 121 }
 122
 123 void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
 124 {
 125         if (rinfo->i2c[0].rinfo)
 126                 i2c_bit_del_bus(&rinfo->i2c[0].adapter);
 127         rinfo->i2c[0].rinfo = NULL;
 128
 129         if (rinfo->i2c[1].rinfo)
 130                 i2c_bit_del_bus(&rinfo->i2c[1].adapter);
 131         rinfo->i2c[1].rinfo = NULL;
 132
 133         if (rinfo->i2c[2].rinfo)
 134                 i2c_bit_del_bus(&rinfo->i2c[2].adapter);
 135         rinfo->i2c[2].rinfo = NULL;
 136
 137         if (rinfo->i2c[3].rinfo)
 138                 i2c_bit_del_bus(&rinfo->i2c[3].adapter);
 139         rinfo->i2c[3].rinfo = NULL;
 140 }
 141
 142
 143 static u8 *radeon_do_probe_i2c_edid(struct radeon_i2c_chan *chan)
 144 {
 145         u8 start = 0x0;
 146         struct i2c_msg msgs[] = {
 147                 {
 148                         .addr   = RADEON_DDC,
 149                         .len    = 1,
 150                         .buf    = &start,
 151                 }, {
 152                         .addr   = RADEON_DDC,
 153                         .flags  = I2C_M_RD,
 154                         .len    = EDID_LENGTH,
 155                 },
 156         };
 157         u8 *buf;
 158
 159         buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
 160         if (!buf) {
 161                 dev_warn(&chan->rinfo->pdev->dev, "Out of memory!\n");
 162                 return NULL;
 163         }
 164         msgs[1].buf = buf;
 165
 166         if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
 167                 return buf;
 168         dev_dbg(&chan->rinfo->pdev->dev, "Unable to read EDID block.\n");
 169         kfree(buf);
 170         return NULL;
 171 }
 172
 173
 174 int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, u8 **out_edid)
 175 {
 176         u32 reg = rinfo->i2c[conn-1].ddc_reg;
 177         u8 *edid = NULL;
 178         int i, j;
 179
 180         OUTREG(reg, INREG(reg) &
 181                         ~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
 182
 183         OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
 184         (void)INREG(reg);
 185
 186         for (i = 0; i < 3; i++) {
 187                 /* For some old monitors we need the
 188                  * following process to initialize/stop DDC
 189                  */
 190                 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
 191                 (void)INREG(reg);
 192                 msleep(13);
 193
 194                 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
 195                 (void)INREG(reg);
 196                 for (j = 0; j < 5; j++) {
 197                         msleep(10);
 198                         if (INREG(reg) & VGA_DDC_CLK_INPUT)
 199                                 break;
 200                 }
 201                 if (j == 5)
 202                         continue;
 203
 204                 OUTREG(reg, INREG(reg) | VGA_DDC_DATA_OUT_EN);
 205                 (void)INREG(reg);
 206                 msleep(15);
 207                 OUTREG(reg, INREG(reg) | VGA_DDC_CLK_OUT_EN);
 208                 (void)INREG(reg);
 209                 msleep(15);
 210                 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
 211                 (void)INREG(reg);
 212                 msleep(15);
 213
 214                 /* Do the real work */
 215                 edid = radeon_do_probe_i2c_edid(&rinfo->i2c[conn-1]);
 216
 217                 OUTREG(reg, INREG(reg) |
 218                                 (VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
 219                 (void)INREG(reg);
 220                 msleep(15);
 221
 222                 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
 223                 (void)INREG(reg);
 224                 for (j = 0; j < 10; j++) {
 225                         msleep(10);
 226                         if (INREG(reg) & VGA_DDC_CLK_INPUT)
 227                                 break;
 228                 }
 229
 230                 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
 231                 (void)INREG(reg);
 232                 msleep(15);
 233                 OUTREG(reg, INREG(reg) |
 234                                 (VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
 235                 (void)INREG(reg);
 236                 if (edid)
 237                         break;
 238         }
 239         /* Release the DDC lines when done or the Apple Cinema HD display
 240          * will switch off
 241          */
 242         OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN | VGA_DDC_DATA_OUT_EN));
 243         (void)INREG(reg);
 244
 245         if (out_edid)
 246                 *out_edid = edid;
 247         if (!edid) {
 248                 RTRACE("radeonfb: I2C (port %d) ... not found\n", conn);
 249                 return MT_NONE;
 250         }
 251         if (edid[0x14] & 0x80) {
 252                 /* Fix detection using BIOS tables */
 253                 if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
 254                     (INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
 255                         RTRACE("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
 256                         return MT_LCD;
 257                 } else {
 258                         RTRACE("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
 259                         return MT_DFP;
 260                 }
 261         }
 262         RTRACE("radeonfb: I2C (port %d) ... found CRT display\n", conn);
 263         return MT_CRT;
 264 }
 265