1 files changed, 376 insertions, 0 deletions

diff --git a/include/asm-arm/arch-s3c2410/dma.h b/include/asm-arm/arch-s3c2410/dma.h
new file mode 100644
index 000000000000..e830a40e573a
--- /dev/null
+++ b/include/asm-arm/arch-s3c2410/dma.h
@@ -0,0 +1,376 @@
+/* linux/include/asm-arm/arch-bast/dma.h
+ *
+ * Copyright (C) 2003,2004 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * Samsung S3C2410X DMA support
+ *
+ * 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.
+ *
+ * Changelog:
+ *  ??-May-2003 BJD   Created file
+ *  ??-Jun-2003 BJD   Added more dma functionality to go with arch
+ *  10-Nov-2004 BJD   Added sys_device support
+*/
+
+#ifndef __ASM_ARCH_DMA_H
+#define __ASM_ARCH_DMA_H __FILE__
+
+#include <linux/config.h>
+#include <linux/sysdev.h>
+#include "hardware.h"
+
+
+/*
+ * This is the maximum DMA address(physical address) that can be DMAd to.
+ *
+ */
+#define MAX_DMA_ADDRESS         0x20000000
+#define MAX_DMA_TRANSFER_SIZE   0x100000 /* Data Unit is half word  */
+
+
+/* according to the samsung port, we cannot use the regular
+ * dma channels... we must therefore provide our own interface
+ * for DMA, and allow our drivers to use that.
+ */
+
+#define MAX_DMA_CHANNELS        0
+
+
+/* we have 4 dma channels */
+#define S3C2410_DMA_CHANNELS        (4)
+
+/* types */
+
+typedef enum {
+        S3C2410_DMA_IDLE,
+        S3C2410_DMA_RUNNING,
+        S3C2410_DMA_PAUSED
+} s3c2410_dma_state_t;
+
+
+/* s3c2410_dma_loadst_t
+ *
+ * This represents the state of the DMA engine, wrt to the loaded / running
+ * transfers. Since we don't have any way of knowing exactly the state of
+ * the DMA transfers, we need to know the state to make decisions on wether
+ * we can
+ *
+ * S3C2410_DMA_NONE
+ *
+ * There are no buffers loaded (the channel should be inactive)
+ *
+ * S3C2410_DMA_1LOADED
+ *
+ * There is one buffer loaded, however it has not been confirmed to be
+ * loaded by the DMA engine. This may be because the channel is not
+ * yet running, or the DMA driver decided that it was too costly to
+ * sit and wait for it to happen.
+ *
+ * S3C2410_DMA_1RUNNING
+ *
+ * The buffer has been confirmed running, and not finisged
+ *
+ * S3C2410_DMA_1LOADED_1RUNNING
+ *
+ * There is a buffer waiting to be loaded by the DMA engine, and one
+ * currently running.
+*/
+
+typedef enum {
+        S3C2410_DMALOAD_NONE,
+        S3C2410_DMALOAD_1LOADED,
+        S3C2410_DMALOAD_1RUNNING,
+        S3C2410_DMALOAD_1LOADED_1RUNNING,
+} s3c2410_dma_loadst_t;
+
+typedef enum {
+        S3C2410_RES_OK,
+        S3C2410_RES_ERR,
+        S3C2410_RES_ABORT
+} s3c2410_dma_buffresult_t;
+
+
+typedef enum s3c2410_dmasrc_e s3c2410_dmasrc_t;
+
+enum s3c2410_dmasrc_e {
+        S3C2410_DMASRC_HW,      /* source is memory */
+        S3C2410_DMASRC_MEM      /* source is hardware */
+};
+
+/* enum s3c2410_chan_op_e
+ *
+ * operation codes passed to the DMA code by the user, and also used
+ * to inform the current channel owner of any changes to the system state
+*/
+
+enum s3c2410_chan_op_e {
+        S3C2410_DMAOP_START,
+        S3C2410_DMAOP_STOP,
+        S3C2410_DMAOP_PAUSE,
+        S3C2410_DMAOP_RESUME,
+        S3C2410_DMAOP_FLUSH,
+        S3C2410_DMAOP_TIMEOUT,           /* internal signal to handler */
+};
+
+typedef enum s3c2410_chan_op_e s3c2410_chan_op_t;
+
+/* flags */
+
+#define S3C2410_DMAF_SLOW         (1<<0)   /* slow, so don't worry about
+                                            * waiting for reloads */
+#define S3C2410_DMAF_AUTOSTART    (1<<1)   /* auto-start if buffer queued */
+
+/* dma buffer */
+
+typedef struct s3c2410_dma_buf_s s3c2410_dma_buf_t;
+
+struct s3c2410_dma_client {
+        char                *name;
+};
+
+typedef struct s3c2410_dma_client s3c2410_dma_client_t;
+
+/* s3c2410_dma_buf_s
+ *
+ * internally used buffer structure to describe a queued or running
+ * buffer.
+*/
+
+struct s3c2410_dma_buf_s {
+        s3c2410_dma_buf_t   *next;
+        int                  magic;        /* magic */
+        int                  size;         /* buffer size in bytes */
+        dma_addr_t           data;         /* start of DMA data */
+        dma_addr_t           ptr;          /* where the DMA got to [1] */
+        void                *id;           /* client's id */
+};
+
+/* [1] is this updated for both recv/send modes? */
+
+typedef struct s3c2410_dma_chan_s s3c2410_dma_chan_t;
+
+/* s3c2410_dma_cbfn_t
+ *
+ * buffer callback routine type
+*/
+
+typedef void (*s3c2410_dma_cbfn_t)(s3c2410_dma_chan_t *, void *buf, int size,
+                                   s3c2410_dma_buffresult_t result);
+
+typedef int  (*s3c2410_dma_opfn_t)(s3c2410_dma_chan_t *,
+                                   s3c2410_chan_op_t );
+
+struct s3c2410_dma_stats_s {
+        unsigned long          loads;
+        unsigned long          timeout_longest;
+        unsigned long          timeout_shortest;
+        unsigned long          timeout_avg;
+        unsigned long          timeout_failed;
+};
+
+typedef struct s3c2410_dma_stats_s s3c2410_dma_stats_t;
+
+/* struct s3c2410_dma_chan_s
+ *
+ * full state information for each DMA channel
+*/
+
+struct s3c2410_dma_chan_s {
+        /* channel state flags and information */
+        unsigned char          number;      /* number of this dma channel */
+        unsigned char          in_use;      /* channel allocated */
+        unsigned char          irq_claimed; /* irq claimed for channel */
+        unsigned char          irq_enabled; /* irq enabled for channel */
+        unsigned char          xfer_unit;   /* size of an transfer */
+
+        /* channel state */
+
+        s3c2410_dma_state_t    state;
+        s3c2410_dma_loadst_t   load_state;
+        s3c2410_dma_client_t  *client;
+
+        /* channel configuration */
+        s3c2410_dmasrc_t       source;
+        unsigned long          dev_addr;
+        unsigned long          load_timeout;
+        unsigned int           flags;        /* channel flags */
+
+        /* channel's hardware position and configuration */
+        void __iomem           *regs;        /* channels registers */
+        void __iomem           *addr_reg;    /* data address register */
+        unsigned int           irq;          /* channel irq */
+        unsigned long          dcon;         /* default value of DCON */
+
+        /* driver handles */
+        s3c2410_dma_cbfn_t     callback_fn;  /* buffer done callback */
+        s3c2410_dma_opfn_t     op_fn;        /* channel operation callback */
+
+        /* stats gathering */
+        s3c2410_dma_stats_t   *stats;
+        s3c2410_dma_stats_t    stats_store;
+
+        /* buffer list and information */
+        s3c2410_dma_buf_t      *curr;        /* current dma buffer */
+        s3c2410_dma_buf_t      *next;        /* next buffer to load */
+        s3c2410_dma_buf_t      *end;         /* end of queue */
+
+        /* system device */
+        struct sys_device       dev;
+};
+
+/* the currently allocated channel information */
+extern s3c2410_dma_chan_t s3c2410_chans[];
+
+/* note, we don't really use dma_device_t at the moment */
+typedef unsigned long dma_device_t;
+
+/* functions --------------------------------------------------------------- */
+
+/* s3c2410_dma_request
+ *
+ * request a dma channel exclusivley
+*/
+
+extern int s3c2410_dma_request(dmach_t channel,
+                               s3c2410_dma_client_t *, void *dev);
+
+
+/* s3c2410_dma_ctrl
+ *
+ * change the state of the dma channel
+*/
+
+extern int s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op);
+
+/* s3c2410_dma_setflags
+ *
+ * set the channel's flags to a given state
+*/
+
+extern int s3c2410_dma_setflags(dmach_t channel,
+                                unsigned int flags);
+
+/* s3c2410_dma_free
+ *
+ * free the dma channel (will also abort any outstanding operations)
+*/
+
+extern int s3c2410_dma_free(dmach_t channel, s3c2410_dma_client_t *);
+
+/* s3c2410_dma_enqueue
+ *
+ * place the given buffer onto the queue of operations for the channel.
+ * The buffer must be allocated from dma coherent memory, or the Dcache/WB
+ * drained before the buffer is given to the DMA system.
+*/
+
+extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
+                               dma_addr_t data, int size);
+
+/* s3c2410_dma_config
+ *
+ * configure the dma channel
+*/
+
+extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
+
+/* s3c2410_dma_devconfig
+ *
+ * configure the device we're talking to
+*/
+
+extern int s3c2410_dma_devconfig(int channel, s3c2410_dmasrc_t source,
+                                 int hwcfg, unsigned long devaddr);
+
+/* s3c2410_dma_getposition
+ *
+ * get the position that the dma transfer is currently at
+*/
+
+extern int s3c2410_dma_getposition(dmach_t channel,
+                                   dma_addr_t *src, dma_addr_t *dest);
+
+extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
+extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
+
+/* DMA Register definitions */
+
+#define S3C2410_DMA_DISRC       (0x00)
+#define S3C2410_DMA_DISRCC      (0x04)
+#define S3C2410_DMA_DIDST       (0x08)
+#define S3C2410_DMA_DIDSTC      (0x0C)
+#define S3C2410_DMA_DCON        (0x10)
+#define S3C2410_DMA_DSTAT       (0x14)
+#define S3C2410_DMA_DCSRC       (0x18)
+#define S3C2410_DMA_DCDST       (0x1C)
+#define S3C2410_DMA_DMASKTRIG   (0x20)
+
+#define S3C2410_DISRCC_INC      (1<<0)
+#define S3C2410_DISRCC_APB      (1<<1)
+
+#define S3C2410_DMASKTRIG_STOP   (1<<2)
+#define S3C2410_DMASKTRIG_ON     (1<<1)
+#define S3C2410_DMASKTRIG_SWTRIG (1<<0)
+
+#define S3C2410_DCON_DEMAND     (0<<31)
+#define S3C2410_DCON_HANDSHAKE  (1<<31)
+#define S3C2410_DCON_SYNC_PCLK  (0<<30)
+#define S3C2410_DCON_SYNC_HCLK  (1<<30)
+
+#define S3C2410_DCON_INTREQ     (1<<29)
+
+#define S3C2410_DCON_CH0_XDREQ0 (0<<24)
+#define S3C2410_DCON_CH0_UART0  (1<<24)
+#define S3C2410_DCON_CH0_SDI    (2<<24)
+#define S3C2410_DCON_CH0_TIMER  (3<<24)
+#define S3C2410_DCON_CH0_USBEP1 (4<<24)
+
+#define S3C2410_DCON_CH1_XDREQ1 (0<<24)
+#define S3C2410_DCON_CH1_UART1  (1<<24)
+#define S3C2410_DCON_CH1_I2SSDI (2<<24)
+#define S3C2410_DCON_CH1_SPI    (3<<24)
+#define S3C2410_DCON_CH1_USBEP2 (4<<24)
+
+#define S3C2410_DCON_CH2_I2SSDO (0<<24)
+#define S3C2410_DCON_CH2_I2SSDI (1<<24)
+#define S3C2410_DCON_CH2_SDI    (2<<24)
+#define S3C2410_DCON_CH2_TIMER  (3<<24)
+#define S3C2410_DCON_CH2_USBEP3 (4<<24)
+
+#define S3C2410_DCON_CH3_UART2  (0<<24)
+#define S3C2410_DCON_CH3_SDI    (1<<24)
+#define S3C2410_DCON_CH3_SPI    (2<<24)
+#define S3C2410_DCON_CH3_TIMER  (3<<24)
+#define S3C2410_DCON_CH3_USBEP4 (4<<24)
+
+#define S3C2410_DCON_SRCSHIFT   (24)
+#define S3C2410_DCON_SRCMASK    (7<<24)
+
+#define S3C2410_DCON_BYTE       (0<<20)
+#define S3C2410_DCON_HALFWORD   (1<<20)
+#define S3C2410_DCON_WORD       (2<<20)
+
+#define S3C2410_DCON_AUTORELOAD (0<<22)
+#define S3C2410_DCON_NORELOAD   (1<<22)
+#define S3C2410_DCON_HWTRIG     (1<<23)
+
+#ifdef CONFIG_CPU_S3C2440
+#define S3C2440_DIDSTC_CHKINT   (1<<2)
+
+#define S3C2440_DCON_CH0_I2SSDO (5<<24)
+#define S3C2440_DCON_CH0_PCMIN  (6<<24)
+
+#define S3C2440_DCON_CH1_PCMOUT (5<<24)
+#define S3C2440_DCON_CH1_SDI    (6<<24)
+
+#define S3C2440_DCON_CH2_PCMIN  (5<<24)
+#define S3C2440_DCON_CH2_MICIN  (6<<24)
+
+#define S3C2440_DCON_CH3_MICIN  (5<<24)
+#define S3C2440_DCON_CH3_PCMOUT (6<<24)
+#endif
+
+#endif /* __ASM_ARCH_DMA_H */