dma-s3c2412.c

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/* linux/arch/arm/mach-s3c2412/dma.c
 *
 * Copyright (c) 2006 Simtec Electronics
 *  Ben Dooks <[email protected]>
 *
 * 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/device.h>
#include <linux/serial_core.h>
#include <linux/io.h>

#include <mach/dma.h>

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

#include <plat/regs-serial.h>
#include <mach/regs-gpio.h>
#include <plat/regs-ac97.h>
#include <plat/regs-dma.h>
#include <mach/regs-mem.h>
#include <mach/regs-lcd.h>
#include <mach/regs-sdi.h>
#include <plat/regs-iis.h>
#include <plat/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),
    },
    [DMACH_SPI0] = {
        .name       = "spi0",
        .channels   = MAP(S3C2412_DMAREQSEL_SPI0TX),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI0RX),
    },
    [DMACH_SPI1] = {
        .name       = "spi1",
        .channels   = MAP(S3C2412_DMAREQSEL_SPI1TX),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_SPI1RX),
    },
    [DMACH_UART0] = {
        .name       = "uart0",
        .channels   = MAP(S3C2412_DMAREQSEL_UART0_0),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_0),
    },
    [DMACH_UART1] = {
        .name       = "uart1",
        .channels   = MAP(S3C2412_DMAREQSEL_UART1_0),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_0),
    },
        [DMACH_UART2] = {
        .name       = "uart2",
        .channels   = MAP(S3C2412_DMAREQSEL_UART2_0),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_0),
    },
    [DMACH_UART0_SRC2] = {
        .name       = "uart0",
        .channels   = MAP(S3C2412_DMAREQSEL_UART0_1),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART0_1),
    },
    [DMACH_UART1_SRC2] = {
        .name       = "uart1",
        .channels   = MAP(S3C2412_DMAREQSEL_UART1_1),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART1_1),
    },
        [DMACH_UART2_SRC2] = {
        .name       = "uart2",
        .channels   = MAP(S3C2412_DMAREQSEL_UART2_1),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_UART2_1),
    },
    [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),
    },
    [DMACH_I2S_OUT] = {
        .name       = "i2s-sdo",
        .channels   = MAP(S3C2412_DMAREQSEL_I2STX),
        .channels_rx    = MAP(S3C2412_DMAREQSEL_I2STX),
    },
    [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 dma_data_direction dir)
{
    unsigned long chsel;

    if (dir == DMA_FROM_DEVICE)
        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 device *dev,
                  struct subsys_interface *sif)
{
    s3c2410_dma_init();
    return s3c24xx_dma_init_map(&s3c2412_dma_sel);
}

static struct subsys_interface s3c2412_dma_interface = {
    .name       = "s3c2412_dma",
    .subsys     = &s3c2412_subsys,
    .add_dev    = s3c2412_dma_add,
};

static int __init s3c2412_dma_init(void)
{
    return subsys_interface_register(&s3c2412_dma_interface);
}

arch_initcall(s3c2412_dma_init);