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

   1 /*
   2  * Copyright (C) 2010-2011 Samsung Electronics Co.Ltd
   3  *
   4  * Base S5P MFC resource and device definitions
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/memblock.h>
  16 #include <linux/ioport.h>
  17 #include <linux/of_fdt.h>
  18 #include <linux/of.h>
  19
  20 #include <mach/map.h>
  21 #include <mach/irqs.h>
  22 #include <plat/devs.h>
  23 #include <plat/mfc.h>
  24
  25 static struct resource s5p_mfc_resource[] = {
  26         [0] = DEFINE_RES_MEM(S5P_PA_MFC, SZ_64K),
  27         [1] = DEFINE_RES_IRQ(IRQ_MFC),
  28 };
  29
  30 struct platform_device s5p_device_mfc = {
  31         .name           = "s5p-mfc",
  32         .id             = -1,
  33         .num_resources  = ARRAY_SIZE(s5p_mfc_resource),
  34         .resource       = s5p_mfc_resource,
  35 };
  36
  37 /*
  38  * MFC hardware has 2 memory interfaces which are modelled as two separate
  39  * platform devices to let dma-mapping distinguish between them.
  40  *
  41  * MFC parent device (s5p_device_mfc) must be registered before memory
  42  * interface specific devices (s5p_device_mfc_l and s5p_device_mfc_r).
  43  */
  44
  45 struct platform_device s5p_device_mfc_l = {
  46         .name           = "s5p-mfc-l",
  47         .id             = -1,
  48         .dev            = {
  49                 .parent                 = &s5p_device_mfc.dev,
  50                 .dma_mask               = &s5p_device_mfc_l.dev.coherent_dma_mask,
  51                 .coherent_dma_mask      = DMA_BIT_MASK(32),
  52         },
  53 };
  54
  55 struct platform_device s5p_device_mfc_r = {
  56         .name           = "s5p-mfc-r",
  57         .id             = -1,
  58         .dev            = {
  59                 .parent                 = &s5p_device_mfc.dev,
  60                 .dma_mask               = &s5p_device_mfc_r.dev.coherent_dma_mask,
  61                 .coherent_dma_mask      = DMA_BIT_MASK(32),
  62         },
  63 };
  64
  65 struct s5p_mfc_reserved_mem {
  66         phys_addr_t     base;
  67         unsigned long   size;
  68         struct device   *dev;
  69 };
  70
  71 static struct s5p_mfc_reserved_mem s5p_mfc_mem[2] __initdata;
  72
  73 void __init s5p_mfc_reserve_mem(phys_addr_t rbase, unsigned int rsize,
  74                                 phys_addr_t lbase, unsigned int lsize)
  75 {
  76         int i;
  77
  78         s5p_mfc_mem[0].dev = &s5p_device_mfc_r.dev;
  79         s5p_mfc_mem[0].base = rbase;
  80         s5p_mfc_mem[0].size = rsize;
  81
  82         s5p_mfc_mem[1].dev = &s5p_device_mfc_l.dev;
  83         s5p_mfc_mem[1].base = lbase;
  84         s5p_mfc_mem[1].size = lsize;
  85
  86         for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
  87                 struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
  88                 if (memblock_remove(area->base, area->size)) {
  89                         printk(KERN_ERR "Failed to reserve memory for MFC device (%ld bytes at 0x%08lx)\n",
  90                                area->size, (unsigned long) area->base);
  91                         area->base = 0;
  92                 }
  93         }
  94 }
  95
  96 static int __init s5p_mfc_memory_init(void)
  97 {
  98         int i;
  99
 100         for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
 101                 struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
 102                 if (!area->base)
 103                         continue;
 104
 105                 if (dma_declare_coherent_memory(area->dev, area->base,
 106                                 area->base, area->size,
 107                                 DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) == 0)
 108                         printk(KERN_ERR "Failed to declare coherent memory for MFC device (%ld bytes at 0x%08lx)\n",
 109                                area->size, (unsigned long) area->base);
 110         }
 111         return 0;
 112 }
 113 device_initcall(s5p_mfc_memory_init);
 114
 115 #ifdef CONFIG_OF
 116 int __init s5p_fdt_find_mfc_mem(unsigned long node, const char *uname,
 117                                 int depth, void *data)
 118 {
 119         __be32 *prop;
 120         unsigned long len;
 121         struct s5p_mfc_dt_meminfo *mfc_mem = data;
 122
 123         if (!data)
 124                 return 0;
 125
 126         if (!of_flat_dt_is_compatible(node, mfc_mem->compatible))
 127                 return 0;
 128
 129         prop = of_get_flat_dt_prop(node, "samsung,mfc-l", &len);
 130         if (!prop || (len != 2 * sizeof(unsigned long)))
 131                 return 0;
 132
 133         mfc_mem->loff = be32_to_cpu(prop[0]);
 134         mfc_mem->lsize = be32_to_cpu(prop[1]);
 135
 136         prop = of_get_flat_dt_prop(node, "samsung,mfc-r", &len);
 137         if (!prop || (len != 2 * sizeof(unsigned long)))
 138                 return 0;
 139
 140         mfc_mem->roff = be32_to_cpu(prop[0]);
 141         mfc_mem->rsize = be32_to_cpu(prop[1]);
 142
 143         return 1;
 144 }
 145 #endif