arch/arm/mach-s3c2412/dma.c

   1 /* linux/arch/arm/mach-s3c2412/dma.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C2412 DMA selection
   7  *
   8  * http://armlinux.simtec.co.uk/
   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 <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/io.h>
  20
  21 #include <mach/dma.h>
  22
  23 #include <plat/dma-s3c24xx.h>
  24 #include <plat/cpu.h>
  25
  26 #include <plat/regs-serial.h>
  27 #include <mach/regs-gpio.h>
  28 #include <plat/regs-ac97.h>
  29 #include <plat/regs-dma.h>
  30 #include <mach/regs-mem.h>
  31 #include <mach/regs-lcd.h>
  32 #include <mach/regs-sdi.h>
  33 #include <plat/regs-iis.h>
  34 #include <plat/regs-spi.h>
  35
  36 #define MAP(x) { (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID }
  37
  38 static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
  39         [DMACH_XD0] = {
  40                 .name           = "xdreq0",
  41                 .channels       = MAP(S3C2412_DMAREQSEL_XDREQ0),
  42                 .channels_rx    = MAP(S3C2412_DMAREQSEL_XDREQ0),
  43         },
  44         [DMACH_XD1] = {
  45                 .name           = "xdreq1",
  46                 .channels       = MAP(S3C2412_DMAREQSEL_XDREQ1),
  47                 .channels_rx    = MAP(S3C2412_DMAREQSEL_XDREQ1),
  48         },
  49         [DMACH_SDI] = {
  50                 .name           = "sdi",
  51                 .channels       = MAP(S3C2412_DMAREQSEL_SDI),
  52                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SDI),
  53         },
  54         [DMACH_SPI0] = {
  55                 .name           = "spi0",
  56                 .channels       = MAP(S3C2412_DMAREQSEL_SPI0TX),
  57                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI0RX),
  58         },
  59         [DMACH_SPI1] = {
  60                 .name           = "spi1",
  61                 .channels       = MAP(S3C2412_DMAREQSEL_SPI1TX),
  62                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI1RX),
  63         },
  64         [DMACH_UART0] = {
  65                 .name           = "uart0",
  66                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_0),
  67                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_0),
  68         },
  69         [DMACH_UART1] = {
  70                 .name           = "uart1",
  71                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_0),
  72                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_0),
  73         },
  74         [DMACH_UART2] = {
  75                 .name           = "uart2",
  76                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_0),
  77                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_0),
  78         },
  79         [DMACH_UART0_SRC2] = {
  80                 .name           = "uart0",
  81                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_1),
  82                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_1),
  83         },
  84         [DMACH_UART1_SRC2] = {
  85                 .name           = "uart1",
  86                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_1),
  87                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_1),
  88         },
  89         [DMACH_UART2_SRC2] = {
  90                 .name           = "uart2",
  91                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_1),
  92                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_1),
  93         },
  94         [DMACH_TIMER] = {
  95                 .name           = "timer",
  96                 .channels       = MAP(S3C2412_DMAREQSEL_TIMER),
  97                 .channels_rx    = MAP(S3C2412_DMAREQSEL_TIMER),
  98         },
  99         [DMACH_I2S_IN] = {
 100                 .name           = "i2s-sdi",
 101                 .channels       = MAP(S3C2412_DMAREQSEL_I2SRX),
 102                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2SRX),
 103         },
 104         [DMACH_I2S_OUT] = {
 105                 .name           = "i2s-sdo",
 106                 .channels       = MAP(S3C2412_DMAREQSEL_I2STX),
 107                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2STX),
 108         },
 109         [DMACH_USB_EP1] = {
 110                 .name           = "usb-ep1",
 111                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP1),
 112                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP1),
 113         },
 114         [DMACH_USB_EP2] = {
 115                 .name           = "usb-ep2",
 116                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP2),
 117                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP2),
 118         },
 119         [DMACH_USB_EP3] = {
 120                 .name           = "usb-ep3",
 121                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP3),
 122                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP3),
 123         },
 124         [DMACH_USB_EP4] = {
 125                 .name           = "usb-ep4",
 126                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP4),
 127                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP4),
 128         },
 129 };
 130
 131 static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
 132                                   struct s3c24xx_dma_map *map,
 133                                   enum dma_data_direction dir)
 134 {
 135         unsigned long chsel;
 136
 137         if (dir == DMA_FROM_DEVICE)
 138                 chsel = map->channels_rx[0];
 139         else
 140                 chsel = map->channels[0];
 141
 142         chsel &= ~DMA_CH_VALID;
 143         chsel |= S3C2412_DMAREQSEL_HW;
 144
 145         writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
 146 }
 147
 148 static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
 149                                struct s3c24xx_dma_map *map)
 150 {
 151         s3c2412_dma_direction(chan, map, chan->source);
 152 }
 153
 154 static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
 155         .select         = s3c2412_dma_select,
 156         .direction      = s3c2412_dma_direction,
 157         .dcon_mask      = 0,
 158         .map            = s3c2412_dma_mappings,
 159         .map_size       = ARRAY_SIZE(s3c2412_dma_mappings),
 160 };
 161
 162 static int __init s3c2412_dma_add(struct device *dev,
 163                                   struct subsys_interface *sif)
 164 {
 165         s3c2410_dma_init();
 166         return s3c24xx_dma_init_map(&s3c2412_dma_sel);
 167 }
 168
 169 static struct subsys_interface s3c2412_dma_interface = {
 170         .name           = "s3c2412_dma",
 171         .subsys         = &s3c2412_subsys,
 172         .add_dev        = s3c2412_dma_add,
 173 };
 174
 175 static int __init s3c2412_dma_init(void)
 176 {
 177         return subsys_interface_register(&s3c2412_dma_interface);
 178 }
 179
 180 arch_initcall(s3c2412_dma_init);