arch/arm/mach-ep93xx/dma.c

   1 /*
   2  * arch/arm/mach-ep93xx/dma.c
   3  *
   4  * Platform support code for the EP93xx dmaengine driver.
   5  *
   6  * Copyright (C) 2011 Mika Westerberg
   7  *
   8  * This work is based on the original dma-m2p implementation with
   9  * following copyrights:
  10  *
  11  *   Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  12  *   Copyright (C) 2006 Applied Data Systems
  13  *   Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or (at
  18  * your option) any later version.
  19  */
  20
  21 #include <linux/dmaengine.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/kernel.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <mach/dma.h>
  29 #include <mach/hardware.h>
  30
  31 #define DMA_CHANNEL(_name, _base, _irq) \
  32         { .name = (_name), .base = (_base), .irq = (_irq) }
  33
  34 /*
  35  * DMA M2P channels.
  36  *
  37  * On the EP93xx chip the following peripherals my be allocated to the 10
  38  * Memory to Internal Peripheral (M2P) channels (5 transmit + 5 receive).
  39  *
  40  *      I2S     contains 3 Tx and 3 Rx DMA Channels
  41  *      AAC     contains 3 Tx and 3 Rx DMA Channels
  42  *      UART1   contains 1 Tx and 1 Rx DMA Channels
  43  *      UART2   contains 1 Tx and 1 Rx DMA Channels
  44  *      UART3   contains 1 Tx and 1 Rx DMA Channels
  45  *      IrDA    contains 1 Tx and 1 Rx DMA Channels
  46  *
  47  * Registers are mapped statically in ep93xx_map_io().
  48  */
  49 static struct ep93xx_dma_chan_data ep93xx_dma_m2p_channels[] = {
  50         DMA_CHANNEL("m2p0", EP93XX_DMA_BASE + 0x0000, IRQ_EP93XX_DMAM2P0),
  51         DMA_CHANNEL("m2p1", EP93XX_DMA_BASE + 0x0040, IRQ_EP93XX_DMAM2P1),
  52         DMA_CHANNEL("m2p2", EP93XX_DMA_BASE + 0x0080, IRQ_EP93XX_DMAM2P2),
  53         DMA_CHANNEL("m2p3", EP93XX_DMA_BASE + 0x00c0, IRQ_EP93XX_DMAM2P3),
  54         DMA_CHANNEL("m2p4", EP93XX_DMA_BASE + 0x0240, IRQ_EP93XX_DMAM2P4),
  55         DMA_CHANNEL("m2p5", EP93XX_DMA_BASE + 0x0200, IRQ_EP93XX_DMAM2P5),
  56         DMA_CHANNEL("m2p6", EP93XX_DMA_BASE + 0x02c0, IRQ_EP93XX_DMAM2P6),
  57         DMA_CHANNEL("m2p7", EP93XX_DMA_BASE + 0x0280, IRQ_EP93XX_DMAM2P7),
  58         DMA_CHANNEL("m2p8", EP93XX_DMA_BASE + 0x0340, IRQ_EP93XX_DMAM2P8),
  59         DMA_CHANNEL("m2p9", EP93XX_DMA_BASE + 0x0300, IRQ_EP93XX_DMAM2P9),
  60 };
  61
  62 static struct ep93xx_dma_platform_data ep93xx_dma_m2p_data = {
  63         .channels               = ep93xx_dma_m2p_channels,
  64         .num_channels           = ARRAY_SIZE(ep93xx_dma_m2p_channels),
  65 };
  66
  67 static struct platform_device ep93xx_dma_m2p_device = {
  68         .name                   = "ep93xx-dma-m2p",
  69         .id                     = -1,
  70         .dev                    = {
  71                 .platform_data  = &ep93xx_dma_m2p_data,
  72         },
  73 };
  74
  75 /*
  76  * DMA M2M channels.
  77  *
  78  * There are 2 M2M channels which support memcpy/memset and in addition simple
  79  * hardware requests from/to SSP and IDE. We do not implement an external
  80  * hardware requests.
  81  *
  82  * Registers are mapped statically in ep93xx_map_io().
  83  */
  84 static struct ep93xx_dma_chan_data ep93xx_dma_m2m_channels[] = {
  85         DMA_CHANNEL("m2m0", EP93XX_DMA_BASE + 0x0100, IRQ_EP93XX_DMAM2M0),
  86         DMA_CHANNEL("m2m1", EP93XX_DMA_BASE + 0x0140, IRQ_EP93XX_DMAM2M1),
  87 };
  88
  89 static struct ep93xx_dma_platform_data ep93xx_dma_m2m_data = {
  90         .channels               = ep93xx_dma_m2m_channels,
  91         .num_channels           = ARRAY_SIZE(ep93xx_dma_m2m_channels),
  92 };
  93
  94 static struct platform_device ep93xx_dma_m2m_device = {
  95         .name                   = "ep93xx-dma-m2m",
  96         .id                     = -1,
  97         .dev                    = {
  98                 .platform_data  = &ep93xx_dma_m2m_data,
  99         },
 100 };
 101
 102 static int __init ep93xx_dma_init(void)
 103 {
 104         platform_device_register(&ep93xx_dma_m2p_device);
 105         platform_device_register(&ep93xx_dma_m2m_device);
 106         return 0;
 107 }
 108 arch_initcall(ep93xx_dma_init);