drivers/media/platform/s5p-mfc/s5p_mfc_opr.c

   1 /*
   2  * drivers/media/platform/s5p-mfc/s5p_mfc_opr.c
   3  *
   4  * Samsung MFC (Multi Function Codec - FIMV) driver
   5  * This file contains hw related functions.
   6  *
   7  * Kamil Debski, Copyright (c) 2012 Samsung Electronics Co., Ltd.
   8  * http://www.samsung.com/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include "s5p_mfc_debug.h"
  16 #include "s5p_mfc_opr.h"
  17 #include "s5p_mfc_opr_v5.h"
  18 #include "s5p_mfc_opr_v6.h"
  19
  20 static struct s5p_mfc_hw_ops *s5p_mfc_ops;
  21
  22 void s5p_mfc_init_hw_ops(struct s5p_mfc_dev *dev)
  23 {
  24         if (IS_MFCV6_PLUS(dev)) {
  25                 s5p_mfc_ops = s5p_mfc_init_hw_ops_v6();
  26                 dev->warn_start = S5P_FIMV_ERR_WARNINGS_START_V6;
  27         } else {
  28                 s5p_mfc_ops = s5p_mfc_init_hw_ops_v5();
  29                 dev->warn_start = S5P_FIMV_ERR_WARNINGS_START;
  30         }
  31         dev->mfc_ops = s5p_mfc_ops;
  32 }
  33
  34 void s5p_mfc_init_regs(struct s5p_mfc_dev *dev)
  35 {
  36         if (IS_MFCV6_PLUS(dev))
  37                 dev->mfc_regs = s5p_mfc_init_regs_v6_plus(dev);
  38 }
  39
  40 int s5p_mfc_alloc_priv_buf(struct s5p_mfc_dev *dev, unsigned int mem_ctx,
  41                            struct s5p_mfc_priv_buf *b)
  42 {
  43         unsigned int bits = dev->mem_size >> PAGE_SHIFT;
  44         unsigned int count = b->size >> PAGE_SHIFT;
  45         unsigned int align = (SZ_64K >> PAGE_SHIFT) - 1;
  46         unsigned int start, offset;
  47
  48         mfc_debug(3, "Allocating priv: %zu\n", b->size);
  49
  50         if (dev->mem_virt) {
  51                 start = bitmap_find_next_zero_area(dev->mem_bitmap, bits, 0, count, align);
  52                 if (start > bits)
  53                         goto no_mem;
  54
  55                 bitmap_set(dev->mem_bitmap, start, count);
  56                 offset = start << PAGE_SHIFT;
  57                 b->virt = dev->mem_virt + offset;
  58                 b->dma = dev->mem_base + offset;
  59         } else {
  60                 struct device *mem_dev = dev->mem_dev[mem_ctx];
  61                 dma_addr_t base = dev->dma_base[mem_ctx];
  62
  63                 b->ctx = mem_ctx;
  64                 b->virt = dma_alloc_coherent(mem_dev, b->size, &b->dma, GFP_KERNEL);
  65                 if (!b->virt)
  66                         goto no_mem;
  67                 if (b->dma < base) {
  68                         mfc_err("Invalid memory configuration - buffer (%pad) is below base memory address(%pad)\n",
  69                                 &b->dma, &base);
  70                         dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
  71                         return -ENOMEM;
  72                 }
  73         }
  74
  75         mfc_debug(3, "Allocated addr %p %pad\n", b->virt, &b->dma);
  76         return 0;
  77 no_mem:
  78         mfc_err("Allocating private buffer of size %zu failed\n", b->size);
  79         return -ENOMEM;
  80 }
  81
  82 int s5p_mfc_alloc_generic_buf(struct s5p_mfc_dev *dev, unsigned int mem_ctx,
  83                            struct s5p_mfc_priv_buf *b)
  84 {
  85         struct device *mem_dev = dev->mem_dev[mem_ctx];
  86
  87         mfc_debug(3, "Allocating generic buf: %zu\n", b->size);
  88
  89         b->ctx = mem_ctx;
  90         b->virt = dma_alloc_coherent(mem_dev, b->size, &b->dma, GFP_KERNEL);
  91         if (!b->virt)
  92                 goto no_mem;
  93
  94         mfc_debug(3, "Allocated addr %p %pad\n", b->virt, &b->dma);
  95         return 0;
  96 no_mem:
  97         mfc_err("Allocating generic buffer of size %zu failed\n", b->size);
  98         return -ENOMEM;
  99 }
 100
 101 void s5p_mfc_release_priv_buf(struct s5p_mfc_dev *dev,
 102                               struct s5p_mfc_priv_buf *b)
 103 {
 104         if (dev->mem_virt) {
 105                 unsigned int start = (b->dma - dev->mem_base) >> PAGE_SHIFT;
 106                 unsigned int count = b->size >> PAGE_SHIFT;
 107
 108                 bitmap_clear(dev->mem_bitmap, start, count);
 109         } else {
 110                 struct device *mem_dev = dev->mem_dev[b->ctx];
 111
 112                 dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
 113         }
 114         b->virt = NULL;
 115         b->dma = 0;
 116         b->size = 0;
 117 }
 118
 119 void s5p_mfc_release_generic_buf(struct s5p_mfc_dev *dev,
 120                               struct s5p_mfc_priv_buf *b)
 121 {
 122         struct device *mem_dev = dev->mem_dev[b->ctx];
 123         dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
 124         b->virt = NULL;
 125         b->dma = 0;
 126         b->size = 0;
 127 }