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