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  1. /*
  2.  * Copyright 2007-8 Advanced Micro Devices, Inc.
  3.  * Copyright 2008 Red Hat Inc.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  9.  * and/or sell copies of the Software, and to permit persons to whom the
  10.  * Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice shall be included in
  13.  * all copies or substantial portions of the Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21.  * OTHER DEALINGS IN THE SOFTWARE.
  22.  *
  23.  * Authors: Dave Airlie
  24.  *          Alex Deucher
  25.  */
  26. #include "drmP.h"
  27. #include "radeon_drm.h"
  28. #include "radeon.h"
  29.  
  30. /**
  31.  * radeon_ddc_probe
  32.  *
  33.  */
  34. bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
  35. {
  36.         u8 out_buf[] = { 0x0, 0x0};
  37.         u8 buf[2];
  38.         int ret;
  39.         struct i2c_msg msgs[] = {
  40.                 {
  41.                         .addr = 0x50,
  42.                         .flags = 0,
  43.                         .len = 1,
  44.                         .buf = out_buf,
  45.                 },
  46.                 {
  47.                         .addr = 0x50,
  48.                         .flags = I2C_M_RD,
  49.                         .len = 1,
  50.                         .buf = buf,
  51.                 }
  52.         };
  53.  
  54.         ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
  55.         if (ret == 2)
  56.                 return true;
  57.  
  58.         return false;
  59. }
  60.  
  61.  
  62. void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
  63. {
  64.         struct radeon_device *rdev = i2c->dev->dev_private;
  65.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  66.         uint32_t temp;
  67.  
  68.         /* RV410 appears to have a bug where the hw i2c in reset
  69.          * holds the i2c port in a bad state - switch hw i2c away before
  70.          * doing DDC - do this for all r200s/r300s/r400s for safety sake
  71.          */
  72.         if (rec->hw_capable) {
  73.         if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
  74.                 if (rec->a_clk_reg == RADEON_GPIO_MONID) {
  75.                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  76.                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
  77.                 } else {
  78.                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  79.                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
  80.                 }
  81.         }
  82.         }
  83.  
  84.         /* clear the output pin values */
  85.         temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
  86.                 WREG32(rec->a_clk_reg, temp);
  87.  
  88.         temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
  89.                 WREG32(rec->a_data_reg, temp);
  90.  
  91.         /* set the pins to input */
  92.         temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
  93.         WREG32(rec->en_clk_reg, temp);
  94.  
  95.         temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
  96.         WREG32(rec->en_data_reg, temp);
  97.  
  98.         /* mask the gpio pins for software use */
  99.         temp = RREG32(rec->mask_clk_reg);
  100.         if (lock_state)
  101.                 temp |= rec->mask_clk_mask;
  102.         else
  103.                 temp &= ~rec->mask_clk_mask;
  104.         WREG32(rec->mask_clk_reg, temp);
  105.         temp = RREG32(rec->mask_clk_reg);
  106.  
  107.         temp = RREG32(rec->mask_data_reg);
  108.         if (lock_state)
  109.                 temp |= rec->mask_data_mask;
  110.         else
  111.                 temp &= ~rec->mask_data_mask;
  112.         WREG32(rec->mask_data_reg, temp);
  113.         temp = RREG32(rec->mask_data_reg);
  114. }
  115.  
  116. static int get_clock(void *i2c_priv)
  117. {
  118.         struct radeon_i2c_chan *i2c = i2c_priv;
  119.         struct radeon_device *rdev = i2c->dev->dev_private;
  120.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  121.         uint32_t val;
  122.  
  123.         /* read the value off the pin */
  124.         val = RREG32(rec->y_clk_reg);
  125.         val &= rec->y_clk_mask;
  126.  
  127.         return (val != 0);
  128. }
  129.  
  130.  
  131. static int get_data(void *i2c_priv)
  132. {
  133.         struct radeon_i2c_chan *i2c = i2c_priv;
  134.         struct radeon_device *rdev = i2c->dev->dev_private;
  135.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  136.         uint32_t val;
  137.  
  138.         /* read the value off the pin */
  139.         val = RREG32(rec->y_data_reg);
  140.         val &= rec->y_data_mask;
  141.  
  142.         return (val != 0);
  143. }
  144.  
  145. static void set_clock(void *i2c_priv, int clock)
  146. {
  147.         struct radeon_i2c_chan *i2c = i2c_priv;
  148.         struct radeon_device *rdev = i2c->dev->dev_private;
  149.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  150.         uint32_t val;
  151.  
  152.         /* set pin direction */
  153.         val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
  154.         val |= clock ? 0 : rec->en_clk_mask;
  155.         WREG32(rec->en_clk_reg, val);
  156. }
  157.  
  158. static void set_data(void *i2c_priv, int data)
  159. {
  160.         struct radeon_i2c_chan *i2c = i2c_priv;
  161.         struct radeon_device *rdev = i2c->dev->dev_private;
  162.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  163.         uint32_t val;
  164.  
  165.         /* set pin direction */
  166.         val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
  167.         val |= data ? 0 : rec->en_data_mask;
  168.         WREG32(rec->en_data_reg, val);
  169. }
  170.  
  171. struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
  172.                 struct radeon_i2c_bus_rec *rec,
  173.                 const char *name)
  174. {
  175.         struct radeon_i2c_chan *i2c;
  176.         int ret;
  177.  
  178.         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
  179.         if (i2c == NULL)
  180.                 return NULL;
  181.  
  182.         i2c->dev = dev;
  183.         i2c->adapter.algo_data = &i2c->algo.bit;
  184.         i2c->algo.bit.setsda = set_data;
  185.         i2c->algo.bit.setscl = set_clock;
  186.         i2c->algo.bit.getsda = get_data;
  187.         i2c->algo.bit.getscl = get_clock;
  188.         i2c->algo.bit.udelay = 20;
  189.         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
  190.          * make this, 2 jiffies is a lot more reliable */
  191.         i2c->algo.bit.timeout = 2;
  192.         i2c->algo.bit.data = i2c;
  193.         i2c->rec = *rec;
  194.         ret = i2c_bit_add_bus(&i2c->adapter);
  195.         if (ret) {
  196.                 DRM_INFO("Failed to register i2c %s\n", name);
  197.                 goto out_free;
  198.         }
  199.  
  200.         return i2c;
  201. out_free:
  202.         kfree(i2c);
  203.         return NULL;
  204.  
  205. }
  206.  
  207. struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
  208.                                              struct radeon_i2c_bus_rec *rec,
  209.                                              const char *name)
  210. {
  211.         struct radeon_i2c_chan *i2c;
  212.         int ret;
  213.  
  214.         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
  215.         if (i2c == NULL)
  216.                 return NULL;
  217.  
  218.         i2c->rec = *rec;
  219. //   i2c->adapter.owner = THIS_MODULE;
  220.         i2c->dev = dev;
  221.         i2c->adapter.algo_data = &i2c->algo.dp;
  222.         i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
  223.         i2c->algo.dp.address = 0;
  224.         ret = i2c_dp_aux_add_bus(&i2c->adapter);
  225.         if (ret) {
  226.                 DRM_INFO("Failed to register i2c %s\n", name);
  227.                 goto out_free;
  228.         }
  229.  
  230.         return i2c;
  231. out_free:
  232.         kfree(i2c);
  233.         return NULL;
  234.  
  235. }
  236.  
  237.  
  238. void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
  239. {
  240.         if (!i2c)
  241.                 return;
  242.  
  243.         kfree(i2c);
  244. }
  245.  
  246. struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
  247. {
  248.         return NULL;
  249. }
  250.  
  251. void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,
  252.                             u8 slave_addr,
  253.                             u8 addr,
  254.                             u8 *val)
  255. {
  256.         u8 out_buf[2];
  257.         u8 in_buf[2];
  258.         struct i2c_msg msgs[] = {
  259.                 {
  260.                         .addr = slave_addr,
  261.                         .flags = 0,
  262.                         .len = 1,
  263.                         .buf = out_buf,
  264.                 },
  265.                 {
  266.                         .addr = slave_addr,
  267.                         .flags = I2C_M_RD,
  268.                         .len = 1,
  269.                         .buf = in_buf,
  270.                 }
  271.         };
  272.  
  273.         out_buf[0] = addr;
  274.         out_buf[1] = 0;
  275.  
  276.         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
  277.                 *val = in_buf[0];
  278.                 DRM_DEBUG("val = 0x%02x\n", *val);
  279.         } else {
  280.                 DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
  281.                           addr, *val);
  282.         }
  283. }
  284.  
  285. void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,
  286.                             u8 slave_addr,
  287.                             u8 addr,
  288.                             u8 val)
  289. {
  290.         uint8_t out_buf[2];
  291.         struct i2c_msg msg = {
  292.                 .addr = slave_addr,
  293.                 .flags = 0,
  294.                 .len = 2,
  295.                 .buf = out_buf,
  296.         };
  297.  
  298.         out_buf[0] = addr;
  299.         out_buf[1] = val;
  300.  
  301.         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
  302.                 DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
  303.                           addr, val);
  304. }
  305.  
  306.