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  1. /*
  2.  * Copyright 2011 Advanced Micro Devices, Inc.
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice shall be included in
  12.  * all copies or substantial portions of the Software.
  13.  *
  14.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20.  * OTHER DEALINGS IN THE SOFTWARE.
  21.  *
  22.  * Authors: Alex Deucher
  23.  *
  24.  */
  25. #include <drm/drmP.h>
  26. #include <drm/radeon_drm.h>
  27. #include "radeon.h"
  28. #include "atom.h"
  29.  
  30. #define TARGET_HW_I2C_CLOCK 50
  31.  
  32. /* these are a limitation of ProcessI2cChannelTransaction not the hw */
  33. #define ATOM_MAX_HW_I2C_WRITE 3
  34. #define ATOM_MAX_HW_I2C_READ  255
  35.  
  36. static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
  37.                                  u8 slave_addr, u8 flags,
  38.                                  u8 *buf, u8 num)
  39. {
  40.         struct drm_device *dev = chan->dev;
  41.         struct radeon_device *rdev = dev->dev_private;
  42.         PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
  43.         int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);
  44.         unsigned char *base;
  45.         u16 out = cpu_to_le16(0);
  46.         int r = 0;
  47.  
  48.         memset(&args, 0, sizeof(args));
  49.  
  50.         mutex_lock(&chan->mutex);
  51.  
  52.         base = (unsigned char *)rdev->mode_info.atom_context->scratch;
  53.  
  54.         if (flags & HW_I2C_WRITE) {
  55.                 if (num > ATOM_MAX_HW_I2C_WRITE) {
  56.                         DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num);
  57.                         r = -EINVAL;
  58.                         goto done;
  59.                 }
  60.                 if (buf == NULL)
  61.                         args.ucRegIndex = 0;
  62.                 else
  63.                 args.ucRegIndex = buf[0];
  64.                 if (num)
  65.                         num--;
  66.                 if (num)
  67.                         memcpy(&out, &buf[1], num);
  68.                 args.lpI2CDataOut = cpu_to_le16(out);
  69.         } else {
  70.                 if (num > ATOM_MAX_HW_I2C_READ) {
  71.                         DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
  72.                         r = -EINVAL;
  73.                         goto done;
  74.                 }
  75.                 args.ucRegIndex = 0;
  76.                 args.lpI2CDataOut = 0;
  77.         }
  78.  
  79.         args.ucFlag = flags;
  80.         args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
  81.         args.ucTransBytes = num;
  82.         args.ucSlaveAddr = slave_addr << 1;
  83.         args.ucLineNumber = chan->rec.i2c_id;
  84.  
  85.         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
  86.  
  87.         /* error */
  88.         if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
  89.                 DRM_DEBUG_KMS("hw_i2c error\n");
  90.                 r = -EIO;
  91.                 goto done;
  92.         }
  93.  
  94.         if (!(flags & HW_I2C_WRITE))
  95.                 radeon_atom_copy_swap(buf, base, num, false);
  96.  
  97. done:
  98.         mutex_unlock(&chan->mutex);
  99.  
  100.         return r;
  101. }
  102.  
  103. int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
  104.                             struct i2c_msg *msgs, int num)
  105. {
  106.         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
  107.         struct i2c_msg *p;
  108.         int i, remaining, current_count, buffer_offset, max_bytes, ret;
  109.         u8 flags;
  110.  
  111.         /* check for bus probe */
  112.         p = &msgs[0];
  113.         if ((num == 1) && (p->len == 0)) {
  114.                 ret = radeon_process_i2c_ch(i2c,
  115.                                             p->addr, HW_I2C_WRITE,
  116.                                             NULL, 0);
  117.                 if (ret)
  118.                         return ret;
  119.                 else
  120.                         return num;
  121.         }
  122.  
  123.         for (i = 0; i < num; i++) {
  124.                 p = &msgs[i];
  125.                 remaining = p->len;
  126.                 buffer_offset = 0;
  127.                 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */
  128.                 if (p->flags & I2C_M_RD) {
  129.                         max_bytes = ATOM_MAX_HW_I2C_READ;
  130.                         flags = HW_I2C_READ;
  131.                 } else {
  132.                         max_bytes = ATOM_MAX_HW_I2C_WRITE;
  133.                         flags = HW_I2C_WRITE;
  134.                 }
  135.                 while (remaining) {
  136.                         if (remaining > max_bytes)
  137.                                 current_count = max_bytes;
  138.                         else
  139.                                 current_count = remaining;
  140.                         ret = radeon_process_i2c_ch(i2c,
  141.                                                     p->addr, flags,
  142.                                                     &p->buf[buffer_offset], current_count);
  143.                         if (ret)
  144.                                 return ret;
  145.                         remaining -= current_count;
  146.                         buffer_offset += current_count;
  147.                 }
  148.         }
  149.  
  150.         return num;
  151. }
  152.  
  153. u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap)
  154. {
  155.         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
  156. }
  157.  
  158.