arch/arm/mach-ep93xx/dma.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/mach-ep93xx/dma.c
   4  *
   5  * Platform support code for the EP93xx dmaengine driver.
   6  *
   7  * Copyright (C) 2011 Mika Westerberg
   8  *
   9  * This work is based on the original dma-m2p implementation with
  10  * following copyrights:
  11  *
  12  *   Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  13  *   Copyright (C) 2006 Applied Data Systems
  14  *   Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
  15  */
  16
  17 #include <linux/dmaengine.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/platform_data/dma-ep93xx.h>
  25 #include "hardware.h"
  26
  27 #include "soc.h"
  28
  29 #define DMA_CHANNEL(_name, _base, _irq) \
  30         { .name = (_name), .base = (_base), .irq = (_irq) }
  31
  32 /*
  33  * DMA M2P channels.
  34  *
  35  * On the EP93xx chip the following peripherals my be allocated to the 10
  36  * Memory to Internal Peripheral (M2P) channels (5 transmit + 5 receive).
  37  *
  38  *      I2S     contains 3 Tx and 3 Rx DMA Channels
  39  *      AAC     contains 3 Tx and 3 Rx DMA Channels
  40  *      UART1   contains 1 Tx and 1 Rx DMA Channels
  41  *      UART2   contains 1 Tx and 1 Rx DMA Channels
  42  *      UART3   contains 1 Tx and 1 Rx DMA Channels
  43  *      IrDA    contains 1 Tx and 1 Rx DMA Channels
  44  *
  45  * Registers are mapped statically in ep93xx_map_io().
  46  */
  47 static struct ep93xx_dma_chan_data ep93xx_dma_m2p_channels[] = {
  48         DMA_CHANNEL("m2p0", EP93XX_DMA_BASE + 0x0000, IRQ_EP93XX_DMAM2P0),
  49         DMA_CHANNEL("m2p1", EP93XX_DMA_BASE + 0x0040, IRQ_EP93XX_DMAM2P1),
  50         DMA_CHANNEL("m2p2", EP93XX_DMA_BASE + 0x0080, IRQ_EP93XX_DMAM2P2),
  51         DMA_CHANNEL("m2p3", EP93XX_DMA_BASE + 0x00c0, IRQ_EP93XX_DMAM2P3),
  52         DMA_CHANNEL("m2p4", EP93XX_DMA_BASE + 0x0240, IRQ_EP93XX_DMAM2P4),
  53         DMA_CHANNEL("m2p5", EP93XX_DMA_BASE + 0x0200, IRQ_EP93XX_DMAM2P5),
  54         DMA_CHANNEL("m2p6", EP93XX_DMA_BASE + 0x02c0, IRQ_EP93XX_DMAM2P6),
  55         DMA_CHANNEL("m2p7", EP93XX_DMA_BASE + 0x0280, IRQ_EP93XX_DMAM2P7),
  56         DMA_CHANNEL("m2p8", EP93XX_DMA_BASE + 0x0340, IRQ_EP93XX_DMAM2P8),
  57         DMA_CHANNEL("m2p9", EP93XX_DMA_BASE + 0x0300, IRQ_EP93XX_DMAM2P9),
  58 };
  59
  60 static struct ep93xx_dma_platform_data ep93xx_dma_m2p_data = {
  61         .channels               = ep93xx_dma_m2p_channels,
  62         .num_channels           = ARRAY_SIZE(ep93xx_dma_m2p_channels),
  63 };
  64
  65 static u64 ep93xx_dma_m2p_mask = DMA_BIT_MASK(32);
  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                 .dma_mask               = &ep93xx_dma_m2p_mask,
  73                 .coherent_dma_mask      = DMA_BIT_MASK(32),
  74         },
  75 };
  76
  77 /*
  78  * DMA M2M channels.
  79  *
  80  * There are 2 M2M channels which support memcpy/memset and in addition simple
  81  * hardware requests from/to SSP and IDE. We do not implement an external
  82  * hardware requests.
  83  *
  84  * Registers are mapped statically in ep93xx_map_io().
  85  */
  86 static struct ep93xx_dma_chan_data ep93xx_dma_m2m_channels[] = {
  87         DMA_CHANNEL("m2m0", EP93XX_DMA_BASE + 0x0100, IRQ_EP93XX_DMAM2M0),
  88         DMA_CHANNEL("m2m1", EP93XX_DMA_BASE + 0x0140, IRQ_EP93XX_DMAM2M1),
  89 };
  90
  91 static struct ep93xx_dma_platform_data ep93xx_dma_m2m_data = {
  92         .channels               = ep93xx_dma_m2m_channels,
  93         .num_channels           = ARRAY_SIZE(ep93xx_dma_m2m_channels),
  94 };
  95
  96 static u64 ep93xx_dma_m2m_mask = DMA_BIT_MASK(32);
  97
  98 static struct platform_device ep93xx_dma_m2m_device = {
  99         .name                   = "ep93xx-dma-m2m",
 100         .id                     = -1,
 101         .dev                    = {
 102                 .platform_data          = &ep93xx_dma_m2m_data,
 103                 .dma_mask               = &ep93xx_dma_m2m_mask,
 104                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 105         },
 106 };
 107
 108 static int __init ep93xx_dma_init(void)
 109 {
 110         platform_device_register(&ep93xx_dma_m2p_device);
 111         platform_device_register(&ep93xx_dma_m2m_device);
 112         return 0;
 113 }
 114 arch_initcall(ep93xx_dma_init);