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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_connector *radeon_connector, int lock_state)
  63. {
  64.         struct radeon_device *rdev = radeon_connector->base.dev->dev_private;
  65.         uint32_t temp;
  66.         struct radeon_i2c_bus_rec *rec = &radeon_connector->ddc_bus->rec;
  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 ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
  73.                 if (rec->a_clk_reg == RADEON_GPIO_MONID) {
  74.                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  75.                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
  76.                 } else {
  77.                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  78.                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
  79.                 }
  80.         }
  81.         if (lock_state) {
  82.                 temp = RREG32(rec->a_clk_reg);
  83.                 temp &= ~(rec->a_clk_mask);
  84.                 WREG32(rec->a_clk_reg, temp);
  85.  
  86.                 temp = RREG32(rec->a_data_reg);
  87.                 temp &= ~(rec->a_data_mask);
  88.                 WREG32(rec->a_data_reg, temp);
  89.         }
  90.  
  91.         temp = RREG32(rec->mask_clk_reg);
  92.         if (lock_state)
  93.                 temp |= rec->mask_clk_mask;
  94.         else
  95.                 temp &= ~rec->mask_clk_mask;
  96.         WREG32(rec->mask_clk_reg, temp);
  97.         temp = RREG32(rec->mask_clk_reg);
  98.  
  99.         temp = RREG32(rec->mask_data_reg);
  100.         if (lock_state)
  101.                 temp |= rec->mask_data_mask;
  102.         else
  103.                 temp &= ~rec->mask_data_mask;
  104.         WREG32(rec->mask_data_reg, temp);
  105.         temp = RREG32(rec->mask_data_reg);
  106. }
  107.  
  108. static int get_clock(void *i2c_priv)
  109. {
  110.         struct radeon_i2c_chan *i2c = i2c_priv;
  111.         struct radeon_device *rdev = i2c->dev->dev_private;
  112.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  113.         uint32_t val;
  114.  
  115.         val = RREG32(rec->get_clk_reg);
  116.         val &= rec->get_clk_mask;
  117.  
  118.         return (val != 0);
  119. }
  120.  
  121.  
  122. static int get_data(void *i2c_priv)
  123. {
  124.         struct radeon_i2c_chan *i2c = i2c_priv;
  125.         struct radeon_device *rdev = i2c->dev->dev_private;
  126.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  127.         uint32_t val;
  128.  
  129.         val = RREG32(rec->get_data_reg);
  130.         val &= rec->get_data_mask;
  131.         return (val != 0);
  132. }
  133.  
  134. static void set_clock(void *i2c_priv, int clock)
  135. {
  136.         struct radeon_i2c_chan *i2c = i2c_priv;
  137.         struct radeon_device *rdev = i2c->dev->dev_private;
  138.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  139.         uint32_t val;
  140.  
  141.         val = RREG32(rec->put_clk_reg) & (uint32_t)~(rec->put_clk_mask);
  142.         val |= clock ? 0 : rec->put_clk_mask;
  143.         WREG32(rec->put_clk_reg, val);
  144. }
  145.  
  146. static void set_data(void *i2c_priv, int data)
  147. {
  148.         struct radeon_i2c_chan *i2c = i2c_priv;
  149.         struct radeon_device *rdev = i2c->dev->dev_private;
  150.         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  151.         uint32_t val;
  152.  
  153.         val = RREG32(rec->put_data_reg) & (uint32_t)~(rec->put_data_mask);
  154.         val |= data ? 0 : rec->put_data_mask;
  155.         WREG32(rec->put_data_reg, val);
  156. }
  157.  
  158. struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
  159.                 struct radeon_i2c_bus_rec *rec,
  160.                 const char *name)
  161. {
  162.         struct radeon_i2c_chan *i2c;
  163.         int ret;
  164.  
  165.         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
  166.         if (i2c == NULL)
  167.                 return NULL;
  168.  
  169. //   i2c->adapter.owner = THIS_MODULE;
  170.         i2c->adapter.algo_data = &i2c->algo;
  171.         i2c->dev = dev;
  172.         i2c->algo.setsda = set_data;
  173.         i2c->algo.setscl = set_clock;
  174.         i2c->algo.getsda = get_data;
  175.         i2c->algo.getscl = get_clock;
  176.         i2c->algo.udelay = 20;
  177.         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
  178.          * make this, 2 jiffies is a lot more reliable */
  179.         i2c->algo.timeout = 2;
  180.         i2c->algo.data = i2c;
  181.         i2c->rec = *rec;
  182. //   i2c_set_adapdata(&i2c->adapter, i2c);
  183.  
  184.         ret = i2c_bit_add_bus(&i2c->adapter);
  185.         if (ret) {
  186.                 DRM_INFO("Failed to register i2c %s\n", name);
  187.                 goto out_free;
  188.         }
  189.  
  190.         return i2c;
  191. out_free:
  192.         kfree(i2c);
  193.         return NULL;
  194.  
  195. }
  196.  
  197. void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
  198. {
  199.         if (!i2c)
  200.                 return;
  201.  
  202.  //  i2c_del_adapter(&i2c->adapter);
  203.         kfree(i2c);
  204. }
  205.  
  206. struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
  207. {
  208.         return NULL;
  209. }
  210.