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