arch/arm/plat-s5p/dev-mfc.c

   1 /* linux/arch/arm/plat-s5p/dev-mfc.c
   2  *
   3  * Copyright (C) 2010-2011 Samsung Electronics Co.Ltd
   4  *
   5  * Base S5P MFC resource and device definitions
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12
  13 #include <linux/kernel.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/memblock.h>
  18 #include <linux/ioport.h>
  19
  20 #include <mach/map.h>
  21 #include <plat/devs.h>
  22 #include <plat/irqs.h>
  23 #include <plat/mfc.h>
  24
  25 static struct resource s5p_mfc_resource[] = {
  26         [0] = {
  27                 .start  = S5P_PA_MFC,
  28                 .end    = S5P_PA_MFC + SZ_64K - 1,
  29                 .flags  = IORESOURCE_MEM,
  30         },
  31         [1] = {
  32                 .start  = IRQ_MFC,
  33                 .end    = IRQ_MFC,
  34                 .flags  = IORESOURCE_IRQ,
  35         }
  36 };
  37
  38 struct platform_device s5p_device_mfc = {
  39         .name           = "s5p-mfc",
  40         .id             = -1,
  41         .num_resources  = ARRAY_SIZE(s5p_mfc_resource),
  42         .resource       = s5p_mfc_resource,
  43 };
  44
  45 /*
  46  * MFC hardware has 2 memory interfaces which are modelled as two separate
  47  * platform devices to let dma-mapping distinguish between them.
  48  *
  49  * MFC parent device (s5p_device_mfc) must be registered before memory
  50  * interface specific devices (s5p_device_mfc_l and s5p_device_mfc_r).
  51  */
  52
  53 static u64 s5p_mfc_dma_mask = DMA_BIT_MASK(32);
  54
  55 struct platform_device s5p_device_mfc_l = {
  56         .name           = "s5p-mfc-l",
  57         .id             = -1,
  58         .dev            = {
  59                 .parent                 = &s5p_device_mfc.dev,
  60                 .dma_mask               = &s5p_mfc_dma_mask,
  61                 .coherent_dma_mask      = DMA_BIT_MASK(32),
  62         },
  63 };
  64
  65 struct platform_device s5p_device_mfc_r = {
  66         .name           = "s5p-mfc-r",
  67         .id             = -1,
  68         .dev            = {
  69                 .parent                 = &s5p_device_mfc.dev,
  70                 .dma_mask               = &s5p_mfc_dma_mask,
  71                 .coherent_dma_mask      = DMA_BIT_MASK(32),
  72         },
  73 };
  74
  75 struct s5p_mfc_reserved_mem {
  76         phys_addr_t     base;
  77         unsigned long   size;
  78         struct device   *dev;
  79 };
  80
  81 static struct s5p_mfc_reserved_mem s5p_mfc_mem[2] __initdata;
  82
  83 void __init s5p_mfc_reserve_mem(phys_addr_t rbase, unsigned int rsize,
  84                                 phys_addr_t lbase, unsigned int lsize)
  85 {
  86         int i;
  87
  88         s5p_mfc_mem[0].dev = &s5p_device_mfc_r.dev;
  89         s5p_mfc_mem[0].base = rbase;
  90         s5p_mfc_mem[0].size = rsize;
  91
  92         s5p_mfc_mem[1].dev = &s5p_device_mfc_l.dev;
  93         s5p_mfc_mem[1].base = lbase;
  94         s5p_mfc_mem[1].size = lsize;
  95
  96         for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
  97                 struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
  98                 if (memblock_remove(area->base, area->size)) {
  99                         printk(KERN_ERR "Failed to reserve memory for MFC device (%ld bytes at 0x%08lx)\n",
 100                                area->size, (unsigned long) area->base);
 101                         area->base = 0;
 102                 }
 103         }
 104 }
 105
 106 static int __init s5p_mfc_memory_init(void)
 107 {
 108         int i;
 109
 110         for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
 111                 struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
 112                 if (!area->base)
 113                         continue;
 114
 115                 if (dma_declare_coherent_memory(area->dev, area->base,
 116                                 area->base, area->size,
 117                                 DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) == 0)
 118                         printk(KERN_ERR "Failed to declare coherent memory for MFC device (%ld bytes at 0x%08lx)\n",
 119                                area->size, (unsigned long) area->base);
 120         }
 121         return 0;
 122 }
 123 device_initcall(s5p_mfc_memory_init);