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/serial_s3c.h>
  20 #include <linux/io.h>
  21
  22 #include <mach/dma.h>
  23
  24 #include <plat/dma-s3c24xx.h>
  25 #include <plat/cpu.h>
  26
  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         },
  39         [DMACH_XD1] = {
  40                 .name           = "xdreq1",
  41                 .channels       = MAP(S3C2412_DMAREQSEL_XDREQ1),
  42         },
  43         [DMACH_SDI] = {
  44                 .name           = "sdi",
  45                 .channels       = MAP(S3C2412_DMAREQSEL_SDI),
  46         },
  47         [DMACH_SPI0_RX] = {
  48                 .name           = "spi0-rx",
  49                 .channels       = MAP(S3C2412_DMAREQSEL_SPI0RX),
  50         },
  51         [DMACH_SPI0_TX] = {
  52                 .name           = "spi0-tx",
  53                 .channels       = MAP(S3C2412_DMAREQSEL_SPI0TX),
  54         },
  55         [DMACH_SPI1_RX] = {
  56                 .name           = "spi1-rx",
  57                 .channels       = MAP(S3C2412_DMAREQSEL_SPI1RX),
  58         },
  59         [DMACH_SPI1_TX] = {
  60                 .name           = "spi1-tx",
  61                 .channels       = MAP(S3C2412_DMAREQSEL_SPI1TX),
  62         },
  63         [DMACH_UART0] = {
  64                 .name           = "uart0",
  65                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_0),
  66         },
  67         [DMACH_UART1] = {
  68                 .name           = "uart1",
  69                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_0),
  70         },
  71         [DMACH_UART2] = {
  72                 .name           = "uart2",
  73                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_0),
  74         },
  75         [DMACH_UART0_SRC2] = {
  76                 .name           = "uart0",
  77                 .channels       = MAP(S3C2412_DMAREQSEL_UART0_1),
  78         },
  79         [DMACH_UART1_SRC2] = {
  80                 .name           = "uart1",
  81                 .channels       = MAP(S3C2412_DMAREQSEL_UART1_1),
  82         },
  83         [DMACH_UART2_SRC2] = {
  84                 .name           = "uart2",
  85                 .channels       = MAP(S3C2412_DMAREQSEL_UART2_1),
  86         },
  87         [DMACH_TIMER] = {
  88                 .name           = "timer",
  89                 .channels       = MAP(S3C2412_DMAREQSEL_TIMER),
  90         },
  91         [DMACH_I2S_IN] = {
  92                 .name           = "i2s-sdi",
  93                 .channels       = MAP(S3C2412_DMAREQSEL_I2SRX),
  94         },
  95         [DMACH_I2S_OUT] = {
  96                 .name           = "i2s-sdo",
  97                 .channels       = MAP(S3C2412_DMAREQSEL_I2STX),
  98         },
  99         [DMACH_USB_EP1] = {
 100                 .name           = "usb-ep1",
 101                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP1),
 102         },
 103         [DMACH_USB_EP2] = {
 104                 .name           = "usb-ep2",
 105                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP2),
 106         },
 107         [DMACH_USB_EP3] = {
 108                 .name           = "usb-ep3",
 109                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP3),
 110         },
 111         [DMACH_USB_EP4] = {
 112                 .name           = "usb-ep4",
 113                 .channels       = MAP(S3C2412_DMAREQSEL_USBEP4),
 114         },
 115 };
 116
 117 static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
 118                                struct s3c24xx_dma_map *map)
 119 {
 120         unsigned long chsel = map->channels[0] & (~DMA_CH_VALID);
 121         writel(chsel | S3C2412_DMAREQSEL_HW,
 122                chan->regs + S3C2412_DMA_DMAREQSEL);
 123 }
 124
 125 static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
 126         .select         = s3c2412_dma_select,
 127         .dcon_mask      = 0,
 128         .map            = s3c2412_dma_mappings,
 129         .map_size       = ARRAY_SIZE(s3c2412_dma_mappings),
 130 };
 131
 132 static int __init s3c2412_dma_add(struct device *dev,
 133                                   struct subsys_interface *sif)
 134 {
 135         s3c2410_dma_init();
 136         return s3c24xx_dma_init_map(&s3c2412_dma_sel);
 137 }
 138
 139 static struct subsys_interface s3c2412_dma_interface = {
 140         .name           = "s3c2412_dma",
 141         .subsys         = &s3c2412_subsys,
 142         .add_dev        = s3c2412_dma_add,
 143 };
 144
 145 static int __init s3c2412_dma_init(void)
 146 {
 147         return subsys_interface_register(&s3c2412_dma_interface);
 148 }
 149
 150 arch_initcall(s3c2412_dma_init);