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   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-plat.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-mem.h>
  31 #include <mach/regs-lcd.h>
  32 #include <mach/regs-sdi.h>
  33 #include <plat/regs-s3c2412-iis.h>
  34 #include <plat/regs-iis.h>
  35 #include <plat/regs-spi.h>
  36
  37 #define MAP(x) { (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID }
  38
  39 static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
  40         [DMACH_XD0] = {
  41                 .name           = "xdreq0",
  42                 .channels       = MAP(S3C2412_DMAREQSEL_XDREQ0),
  43                 .channels_rx    = MAP(S3C2412_DMAREQSEL_XDREQ0),
  44         },
  45         [DMACH_XD1] = {
  46                 .name           = "xdreq1",
  47                 .channels       = MAP(S3C2412_DMAREQSEL_XDREQ1),
  48                 .channels_rx    = MAP(S3C2412_DMAREQSEL_XDREQ1),
  49         },
  50         [DMACH_SDI] = {
  51                 .name           = "sdi",
  52                 .channels       = MAP(S3C2412_DMAREQSEL_SDI),
  53                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SDI),
  54                 .hw_addr.to     = S3C2410_PA_SDI + S3C2410_SDIDATA,
  55                 .hw_addr.from   = S3C2410_PA_SDI + S3C2410_SDIDATA,
  56         },
  57         [DMACH_SPI0] = {
  58                 .name           = "spi0",
  59                 .channels       = MAP(S3C2412_DMAREQSEL_SPI0TX),
  60                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI0RX),
  61                 .hw_addr.to     = S3C2410_PA_SPI + S3C2410_SPTDAT,
  62                 .hw_addr.from   = S3C2410_PA_SPI + S3C2410_SPRDAT,
  63         },
  64         [DMACH_SPI1] = {
  65                 .name           = "spi1",
  66                 .channels       = MAP(S3C2412_DMAREQSEL_SPI1TX),
  67                 .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI1RX),
  68                 .hw_addr.to     = S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPTDAT,
  69                 .hw_addr.from   = S3C2410_PA_SPI + S3C2412_SPI1  + S3C2410_SPRDAT,
  70         },
  71         [DMACH_UART0] = {
  72                 .name           = "uart0",
  73                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_0),
  74                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_0),
  75                 .hw_addr.to     = S3C2410_PA_UART0 + S3C2410_UTXH,
  76                 .hw_addr.from   = S3C2410_PA_UART0 + S3C2410_URXH,
  77         },
  78         [DMACH_UART1] = {
  79                 .name           = "uart1",
  80                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_0),
  81                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_0),
  82                 .hw_addr.to     = S3C2410_PA_UART1 + S3C2410_UTXH,
  83                 .hw_addr.from   = S3C2410_PA_UART1 + S3C2410_URXH,
  84         },
  85         [DMACH_UART2] = {
  86                 .name           = "uart2",
  87                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_0),
  88                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_0),
  89                 .hw_addr.to     = S3C2410_PA_UART2 + S3C2410_UTXH,
  90                 .hw_addr.from   = S3C2410_PA_UART2 + S3C2410_URXH,
  91         },
  92         [DMACH_UART0_SRC2] = {
  93                 .name           = "uart0",
  94                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_1),
  95                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_1),
  96                 .hw_addr.to     = S3C2410_PA_UART0 + S3C2410_UTXH,
  97                 .hw_addr.from   = S3C2410_PA_UART0 + S3C2410_URXH,
  98         },
  99         [DMACH_UART1_SRC2] = {
 100                 .name           = "uart1",
 101                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_1),
 102                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_1),
 103                 .hw_addr.to     = S3C2410_PA_UART1 + S3C2410_UTXH,
 104                 .hw_addr.from   = S3C2410_PA_UART1 + S3C2410_URXH,
 105         },
 106         [DMACH_UART2_SRC2] = {
 107                 .name           = "uart2",
 108                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_1),
 109                 .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_1),
 110                 .hw_addr.to     = S3C2410_PA_UART2 + S3C2410_UTXH,
 111                 .hw_addr.from   = S3C2410_PA_UART2 + S3C2410_URXH,
 112         },
 113         [DMACH_TIMER] = {
 114                 .name           = "timer",
 115                 .channels       = MAP(S3C2412_DMAREQSEL_TIMER),
 116                 .channels_rx    = MAP(S3C2412_DMAREQSEL_TIMER),
 117         },
 118         [DMACH_I2S_IN] = {
 119                 .name           = "i2s-sdi",
 120                 .channels       = MAP(S3C2412_DMAREQSEL_I2SRX),
 121                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2SRX),
 122                 .hw_addr.from   = S3C2410_PA_IIS + S3C2412_IISRXD,
 123         },
 124         [DMACH_I2S_OUT] = {
 125                 .name           = "i2s-sdo",
 126                 .channels       = MAP(S3C2412_DMAREQSEL_I2STX),
 127                 .channels_rx    = MAP(S3C2412_DMAREQSEL_I2STX),
 128                 .hw_addr.to     = S3C2410_PA_IIS + S3C2412_IISTXD,
 129         },
 130         [DMACH_USB_EP1] = {
 131                 .name           = "usb-ep1",
 132                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP1),
 133                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP1),
 134         },
 135         [DMACH_USB_EP2] = {
 136                 .name           = "usb-ep2",
 137                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP2),
 138                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP2),
 139         },
 140         [DMACH_USB_EP3] = {
 141                 .name           = "usb-ep3",
 142                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP3),
 143                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP3),
 144         },
 145         [DMACH_USB_EP4] = {
 146                 .name           = "usb-ep4",
 147                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP4),
 148                 .channels_rx    = MAP(S3C2412_DMAREQSEL_USBEP4),
 149         },
 150 };
 151
 152 static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
 153                                   struct s3c24xx_dma_map *map,
 154                                   enum s3c2410_dmasrc dir)
 155 {
 156         unsigned long chsel;
 157
 158         if (dir == S3C2410_DMASRC_HW)
 159                 chsel = map->channels_rx[0];
 160         else
 161                 chsel = map->channels[0];
 162
 163         chsel &= ~DMA_CH_VALID;
 164         chsel |= S3C2412_DMAREQSEL_HW;
 165
 166         writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
 167 }
 168
 169 static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
 170                                struct s3c24xx_dma_map *map)
 171 {
 172         s3c2412_dma_direction(chan, map, chan->source);
 173 }
 174
 175 static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
 176         .select         = s3c2412_dma_select,
 177         .direction      = s3c2412_dma_direction,
 178         .dcon_mask      = 0,
 179         .map            = s3c2412_dma_mappings,
 180         .map_size       = ARRAY_SIZE(s3c2412_dma_mappings),
 181 };
 182
 183 static int __init s3c2412_dma_add(struct sys_device *sysdev)
 184 {
 185         s3c2410_dma_init();
 186         return s3c24xx_dma_init_map(&s3c2412_dma_sel);
 187 }
 188
 189 static struct sysdev_driver s3c2412_dma_driver = {
 190         .add    = s3c2412_dma_add,
 191 };
 192
 193 static int __init s3c2412_dma_init(void)
 194 {
 195         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_dma_driver);
 196 }
 197
 198 arch_initcall(s3c2412_dma_init);