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