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