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dma.c

/* linux/arch/arm/mach-s3c2412/dma.c
 *
 * Copyright (c) 2006 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * S3C2412 DMA selection
 *
 * http://armlinux.simtec.co.uk/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>
#include <linux/serial_core.h>

#include <asm/dma.h>
#include <mach/dma.h>
#include <asm/io.h>

#include <asm/plat-s3c24xx/dma.h>
#include <asm/plat-s3c24xx/cpu.h>

#include <asm/plat-s3c/regs-serial.h>
#include <mach/regs-gpio.h>
#include <asm/plat-s3c/regs-ac97.h>
#include <mach/regs-mem.h>
#include <mach/regs-lcd.h>
#include <mach/regs-sdi.h>
#include <asm/plat-s3c24xx/regs-s3c2412-iis.h>
#include <asm/plat-s3c24xx/regs-iis.h>
#include <asm/plat-s3c24xx/regs-spi.h>

#define MAP(x) { (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID }

static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
      [DMACH_XD0] = {
            .name       = "xdreq0",
            .channels   = MAP(S3C2412_DMAREQSEL_XDREQ0),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_XDREQ0),
      },
      [DMACH_XD1] = {
            .name       = "xdreq1",
            .channels   = MAP(S3C2412_DMAREQSEL_XDREQ1),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_XDREQ1),
      },
      [DMACH_SDI] = {
            .name       = "sdi",
            .channels   = MAP(S3C2412_DMAREQSEL_SDI),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_SDI),
            .hw_addr.to = S3C2410_PA_SDI + S3C2410_SDIDATA,
            .hw_addr.from     = S3C2410_PA_SDI + S3C2410_SDIDATA,
      },
      [DMACH_SPI0] = {
            .name       = "spi0",
            .channels   = MAP(S3C2412_DMAREQSEL_SPI0TX),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_SPI0RX),
            .hw_addr.to = S3C2410_PA_SPI + S3C2410_SPTDAT,
            .hw_addr.from     = S3C2410_PA_SPI + S3C2410_SPRDAT,
      },
      [DMACH_SPI1] = {
            .name       = "spi1",
            .channels   = MAP(S3C2412_DMAREQSEL_SPI1TX),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_SPI1RX),
            .hw_addr.to = S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPTDAT,
            .hw_addr.from     = S3C2410_PA_SPI + S3C2412_SPI1  + S3C2410_SPRDAT,
      },
      [DMACH_UART0] = {
            .name       = "uart0",
            .channels   = MAP(S3C2412_DMAREQSEL_UART0_0),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART0_0),
            .hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART0 + S3C2410_URXH,
      },
      [DMACH_UART1] = {
            .name       = "uart1",
            .channels   = MAP(S3C2412_DMAREQSEL_UART1_0),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART1_0),
            .hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART1 + S3C2410_URXH,
      },
            [DMACH_UART2] = {
            .name       = "uart2",
            .channels   = MAP(S3C2412_DMAREQSEL_UART2_0),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART2_0),
            .hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART2 + S3C2410_URXH,
      },
      [DMACH_UART0_SRC2] = {
            .name       = "uart0",
            .channels   = MAP(S3C2412_DMAREQSEL_UART0_1),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART0_1),
            .hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART0 + S3C2410_URXH,
      },
      [DMACH_UART1_SRC2] = {
            .name       = "uart1",
            .channels   = MAP(S3C2412_DMAREQSEL_UART1_1),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART1_1),
            .hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART1 + S3C2410_URXH,
      },
            [DMACH_UART2_SRC2] = {
            .name       = "uart2",
            .channels   = MAP(S3C2412_DMAREQSEL_UART2_1),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_UART2_1),
            .hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
            .hw_addr.from     = S3C2410_PA_UART2 + S3C2410_URXH,
      },
      [DMACH_TIMER] = {
            .name       = "timer",
            .channels   = MAP(S3C2412_DMAREQSEL_TIMER),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_TIMER),
      },
      [DMACH_I2S_IN] = {
            .name       = "i2s-sdi",
            .channels   = MAP(S3C2412_DMAREQSEL_I2SRX),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_I2SRX),
            .hw_addr.from     = S3C2410_PA_IIS + S3C2412_IISRXD,
      },
      [DMACH_I2S_OUT] = {
            .name       = "i2s-sdo",
            .channels   = MAP(S3C2412_DMAREQSEL_I2STX),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_I2STX),
            .hw_addr.to = S3C2410_PA_IIS + S3C2412_IISTXD,
      },
      [DMACH_USB_EP1] = {
            .name       = "usb-ep1",
            .channels   = MAP(S3C2412_DMAREQSEL_USBEP1),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_USBEP1),
      },
      [DMACH_USB_EP2] = {
            .name       = "usb-ep2",
            .channels   = MAP(S3C2412_DMAREQSEL_USBEP2),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_USBEP2),
      },
      [DMACH_USB_EP3] = {
            .name       = "usb-ep3",
            .channels   = MAP(S3C2412_DMAREQSEL_USBEP3),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_USBEP3),
      },
      [DMACH_USB_EP4] = {
            .name       = "usb-ep4",
            .channels   = MAP(S3C2412_DMAREQSEL_USBEP4),
            .channels_rx      = MAP(S3C2412_DMAREQSEL_USBEP4),
      },
};

static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
                          struct s3c24xx_dma_map *map,
                          enum s3c2410_dmasrc dir)
{
      unsigned long chsel;

      if (dir == S3C2410_DMASRC_HW)
            chsel = map->channels_rx[0];
      else
            chsel = map->channels[0];

      chsel &= ~DMA_CH_VALID;
      chsel |= S3C2412_DMAREQSEL_HW;

      writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
}

static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
                         struct s3c24xx_dma_map *map)
{
      s3c2412_dma_direction(chan, map, chan->source);
}

static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
      .select           = s3c2412_dma_select,
      .direction  = s3c2412_dma_direction,
      .dcon_mask  = 0,
      .map        = s3c2412_dma_mappings,
      .map_size   = ARRAY_SIZE(s3c2412_dma_mappings),
};

static int __init s3c2412_dma_add(struct sys_device *sysdev)
{
      s3c2410_dma_init();
      return s3c24xx_dma_init_map(&s3c2412_dma_sel);
}

static struct sysdev_driver s3c2412_dma_driver = {
      .add  = s3c2412_dma_add,
};

static int __init s3c2412_dma_init(void)
{
      return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_dma_driver);
}

arch_initcall(s3c2412_dma_init);

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