kernel/2.6.29.6-aldebaran-rt/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/sysdev.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/io.h>
  20
  21 #include <mach/dma.h>
  22
  23 #include <plat/dma.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 <mach/regs-mem.h>
  30 #include <mach/regs-lcd.h>
  31 #include <mach/regs-sdi.h>
  32 #include <asm/plat-s3c24xx/regs-s3c2412-iis.h>
  33 #include <asm/plat-s3c24xx/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                 .hw_addr.to     = S3C2410_PA_SDI + S3C2410_SDIDATA,
  54                 .hw_addr.from   = S3C2410_PA_SDI + S3C2410_SDIDATA,
  55         },
  56         [DMACH_SPI0] = {
  57                 .name           = "spi0",
  58                 .channels       = MAP(S3C2412_DMAREQSEL_SPI0TX),
  59                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI0RX),
  60                 .hw_addr.to     = S3C2410_PA_SPI + S3C2410_SPTDAT,
  61                 .hw_addr.from   = S3C2410_PA_SPI + S3C2410_SPRDAT,
  62         },
  63         [DMACH_SPI1] = {
  64                 .name           = "spi1",
  65                 .channels       = MAP(S3C2412_DMAREQSEL_SPI1TX),
  66                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI1RX),
  67                 .hw_addr.to     = S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPTDAT,
  68                 .hw_addr.from   = S3C2410_PA_SPI + S3C2412_SPI1  + S3C2410_SPRDAT,
  69         },
  70         [DMACH_UART0] = {
  71                 .name           = "uart0",
  72                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_0),
  73                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_0),
  74                 .hw_addr.to     = S3C2410_PA_UART0 + S3C2410_UTXH,
  75                 .hw_addr.from   = S3C2410_PA_UART0 + S3C2410_URXH,
  76         },
  77         [DMACH_UART1] = {
  78                 .name           = "uart1",
  79                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_0),
  80                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_0),
  81                 .hw_addr.to     = S3C2410_PA_UART1 + S3C2410_UTXH,
  82                 .hw_addr.from   = S3C2410_PA_UART1 + S3C2410_URXH,
  83         },
  84         [DMACH_UART2] = {
  85                 .name           = "uart2",
  86                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_0),
  87                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_0),
  88                 .hw_addr.to     = S3C2410_PA_UART2 + S3C2410_UTXH,
  89                 .hw_addr.from   = S3C2410_PA_UART2 + S3C2410_URXH,
  90         },
  91         [DMACH_UART0_SRC2] = {
  92                 .name           = "uart0",
  93                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_1),
  94                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_1),
  95                 .hw_addr.to     = S3C2410_PA_UART0 + S3C2410_UTXH,
  96                 .hw_addr.from   = S3C2410_PA_UART0 + S3C2410_URXH,
  97         },
  98         [DMACH_UART1_SRC2] = {
  99                 .name           = "uart1",
 100                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_1),
 101                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_1),
 102                 .hw_addr.to     = S3C2410_PA_UART1 + S3C2410_UTXH,
 103                 .hw_addr.from   = S3C2410_PA_UART1 + S3C2410_URXH,
 104         },
 105         [DMACH_UART2_SRC2] = {
 106                 .name           = "uart2",
 107                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_1),
 108                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_1),
 109                 .hw_addr.to     = S3C2410_PA_UART2 + S3C2410_UTXH,
 110                 .hw_addr.from   = S3C2410_PA_UART2 + S3C2410_URXH,
 111         },
 112         [DMACH_TIMER] = {
 113                 .name           = "timer",
 114                 .channels       = MAP(S3C2412_DMAREQSEL_TIMER),
 115                 .channels_rx    = MAP(S3C2412_DMAREQSEL_TIMER),
 116         },
 117         [DMACH_I2S_IN] = {
 118                 .name           = "i2s-sdi",
 119                 .channels       = MAP(S3C2412_DMAREQSEL_I2SRX),
 120                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2SRX),
 121                 .hw_addr.from   = S3C2410_PA_IIS + S3C2412_IISRXD,
 122         },
 123         [DMACH_I2S_OUT] = {
 124                 .name           = "i2s-sdo",
 125                 .channels       = MAP(S3C2412_DMAREQSEL_I2STX),
 126                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2STX),
 127                 .hw_addr.to     = S3C2410_PA_IIS + S3C2412_IISTXD,
 128         },
 129         [DMACH_USB_EP1] = {
 130                 .name           = "usb-ep1",
 131                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP1),
 132                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP1),
 133         },
 134         [DMACH_USB_EP2] = {
 135                 .name           = "usb-ep2",
 136                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP2),
 137                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP2),
 138         },
 139         [DMACH_USB_EP3] = {
 140                 .name           = "usb-ep3",
 141                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP3),
 142                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP3),
 143         },
 144         [DMACH_USB_EP4] = {
 145                 .name           = "usb-ep4",
 146                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP4),
 147                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP4),
 148         },
 149 };
 150
 151 static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
 152                                   struct s3c24xx_dma_map *map,
 153                                   enum s3c2410_dmasrc dir)
 154 {
 155         unsigned long chsel;
 156
 157         if (dir == S3C2410_DMASRC_HW)
 158                 chsel = map->channels_rx[0];
 159         else
 160                 chsel = map->channels[0];
 161
 162         chsel &= ~DMA_CH_VALID;
 163         chsel |= S3C2412_DMAREQSEL_HW;
 164
 165         writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
 166 }
 167
 168 static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
 169                                struct s3c24xx_dma_map *map)
 170 {
 171         s3c2412_dma_direction(chan, map, chan->source);
 172 }
 173
 174 static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
 175         .select         = s3c2412_dma_select,
 176         .direction      = s3c2412_dma_direction,
 177         .dcon_mask      = 0,
 178         .map            = s3c2412_dma_mappings,
 179         .map_size       = ARRAY_SIZE(s3c2412_dma_mappings),
 180 };
 181
 182 static int __init s3c2412_dma_add(struct sys_device *sysdev)
 183 {
 184         s3c2410_dma_init();
 185         return s3c24xx_dma_init_map(&s3c2412_dma_sel);
 186 }
 187
 188 static struct sysdev_driver s3c2412_dma_driver = {
 189         .add    = s3c2412_dma_add,
 190 };
 191
 192 static int __init s3c2412_dma_init(void)
 193 {
 194         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_dma_driver);
 195 }
 196
 197 arch_initcall(s3c2412_dma_init);