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* O2 VICE support
@ 2002-12-10 19:11 ilya
  2002-12-11 13:38 ` Christoph Hellwig
  2002-12-22  9:20 ` Geert Uytterhoeven
  0 siblings, 2 replies; 6+ messages in thread
From: ilya @ 2002-12-10 19:11 UTC (permalink / raw)
  To: linux-mips; +Cc: ralf


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Attached is patch set to add support to kernel for O2 video compression engine
(VICE). It should apply cleanly to latest CVS.

	Ilya.


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[-- Type: text/plain, Size: 53234 bytes --]

Index: arch/mips64/kernel/ioctl32.c
===================================================================
RCS file: /home/cvs/linux/arch/mips64/kernel/ioctl32.c,v
retrieving revision 1.26
diff -u -r1.26 ioctl32.c
--- arch/mips64/kernel/ioctl32.c	12 Nov 2002 15:26:11 -0000	1.26
+++ arch/mips64/kernel/ioctl32.c	10 Dec 2002 17:02:29 -0000
@@ -55,6 +57,10 @@
 
 #include <linux/rtc.h>
 
+#ifdef CONFIG_O2_VICE
+#include <linux/vice.h>
+#endif
+
 long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg);
 
 static int w_long(unsigned int fd, unsigned int cmd, unsigned long arg)
@@ -827,6 +968,12 @@
 COMPATIBLE_IOCTL(TIOCGSERIAL)
 COMPATIBLE_IOCTL(TIOCSSERIAL)
 COMPATIBLE_IOCTL(TIOCSERGETLSR)
+#ifdef CONFIG_O2_VICE
+COMPATIBLE_IOCTL(VICE_IOCTL_MAP_DMA)
+COMPATIBLE_IOCTL(VICE_IOCTL_MSP_RUN)
+COMPATIBLE_IOCTL(VICE_IOCTL_BSP_RUN)
+COMPATIBLE_IOCTL(VICE_IOCTL_DO_DMA)
+#endif
 
 COMPATIBLE_IOCTL(FIOCLEX)
 COMPATIBLE_IOCTL(FIONCLEX)
Index: drivers/char/Kconfig
===================================================================
RCS file: /home/cvs/linux/drivers/char/Kconfig,v
retrieving revision 1.1
diff -u -r1.1 Kconfig
--- drivers/char/Kconfig	2 Nov 2002 20:01:57 -0000	1.1
+++ drivers/char/Kconfig	10 Dec 2002 17:02:31 -0000
@@ -1281,6 +1281,8 @@
 
 source "drivers/char/pcmcia/Kconfig"
 
+source drivers/char/o2vice/Kconfig
+
 config MWAVE
 	tristate "ACP Modem (Mwave) support"
 	depends on X86
Index: drivers/char/Makefile
===================================================================
RCS file: /home/cvs/linux/drivers/char/Makefile,v
retrieving revision 1.100
diff -u -r1.100 Makefile
--- drivers/char/Makefile	12 Nov 2002 15:03:11 -0000	1.100
+++ drivers/char/Makefile	10 Dec 2002 17:02:31 -0000
@@ -111,6 +111,7 @@
 obj-$(CONFIG_AGP) += agp/
 obj-$(CONFIG_DRM) += drm/
 obj-$(CONFIG_PCMCIA) += pcmcia/
+obj-$(CONFIG_O2_VICE) += o2vice/
 
 # Files generated that shall be removed upon make clean
 clean-files := consolemap_deftbl.c defkeymap.c qtronixmap.c
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/Kconfig	Sat Nov  2 14:10:16 2002
@@ -0,0 +1,32 @@
+#
+# O2 VICE Engine confiuration
+#
+
+config O2_VICE
+    tristate "O2 VICE Engine Support"
+    depends on SGI_IP32
+    ---help---
+      This option enables O2 VICE Engine support.
+      VICE stands for Video Image Compression Engine. This is very powerfull
+      piece of silicon, that can greatly speed up lots of graphics, vide, or
+      sound related tasks. To be able to use it, you will also need special
+      library, that can be found at <insert URL here>
+
+config O2_VICE_DBGG
+    bool "VICE Debugger Support. READ HELP!"
+    depends on O2_VICE
+    ---help---
+      This option enables features of VICE driver needed to debug VICE library.
+      This is probably serious security risk. You don't need it. If you think
+      you do, you are wrong. Say NO.
+
+config O2_VICE_DBG
+    bool "You seem to insist... did you read help? Yes? No? READ HELP!"
+    depends on O2_VICE_DBGG
+    ---help---
+      You are still here? Didn't I just tell you that it is not needed?
+      Or do you want to say you *legally* obtained information needed for
+      programming VICE? That you got all the tools needed? As a matter of
+      fact, these tools don't even exist yet!
+
+      Sigh... You've been warned...
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/Makefile	Thu Sep 12 00:12:16 2002
@@ -0,0 +1,21 @@
+#
+# drivers/char/o2vice/Makefile
+#
+# Makefile for the O2 VICE Engine driver.
+#
+
+SUB_DIRS     := 
+MOD_SUB_DIRS := $(SUB_DIRS)
+ALL_SUB_DIRS := $(SUB_DIRS)
+
+#O_TARGET := vice.o
+
+obj-y		:=
+obj-m		:=
+obj-n		:=
+obj-		:=
+
+obj-$(CONFIG_O2_VICE)	+= main.o msp.o bsp.o dma.o
+#obj-$(CONFIG_O2_VICE_DBG) += vicedebug.o
+
+include $(TOPDIR)/Rules.make
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ include/linux/vice.h	Tue Dec 10 09:51:46 2002
@@ -0,0 +1,462 @@
+/*
+ * vice.h -- definitions for the SGI O2 VICE
+ *
+ * The code used as a template for 'vice' driver
+ * came from the book "Linux Device Drivers" by
+ * Alessandro Rubini and Jonathan Corbet,
+ * published by O'Reilly & Associates
+ *
+ * Copyright (C) 2002 Ilya Volynets
+ *      Development was sponsored by Total Knowledge
+ *      http://www.total-knowledge.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * =====================================================================
+ * 09.16.2002 - iluxa
+ *     - MSP and DMA units mostly work.
+ *     - Simple ioctl interface to managing I/O buffers (just 2 4M buffers)
+ */
+
+#ifndef _VICE_H_
+#define _VICE_H_
+
+#include <linux/ioctl.h> /* needed for the _IOW etc stuff used later */
+#ifdef __KERNEL__
+#include <asm/pci.h>
+#endif
+#include <linux/types.h>	/* size_t */
+
+#ifndef __KERNEL__
+typedef __u64 u64;
+typedef __u32 u32;
+typedef __u16 u16;
+#endif /* __KERNEL */
+
+/*
+ * Macros to help debugging
+ */
+
+#ifdef __KERNEL__
+
+#define VICE_DEBUG 1
+
+#undef DPRINTK             /* undef it, just in case */
+#ifdef VICE_DEBUG
+# define DPRINTK(fmt, args...) printk( KERN_DEBUG "vice: " fmt, ## args)
+#else
+# define DPRINTK(fmt, args...) /* not debugging: nothing */
+#endif
+
+#define PDEBUG DPRINTK
+
+#ifndef VICE_MAJOR
+#define VICE_MAJOR 240   /* dynamic major by default */
+#endif
+
+#define VICE_VICE 0 /* main vice device, debug, stream data through, etc. */
+
+#define VICE_MAX_TYPE 1 /* always define it to be max possible minor nr for this driver */
+
+
+#include <linux/devfs_fs_kernel.h>
+
+#include <asm/ip32/crime.h>
+
+extern devfs_handle_t vice_devfs_dir;
+/*
+ * Prototypes for shared functions
+ */
+ssize_t vice_read (struct file *filp, char *buf, size_t count,
+                    loff_t *f_pos);
+ssize_t vice_write (struct file *filp, const char *buf, size_t count,
+                     loff_t *f_pos);
+loff_t  vice_llseek (struct file *filp, loff_t off, int whence);
+int     vice_ioctl (struct inode *inode, struct file *filp,
+                     unsigned int cmd, unsigned long arg);
+#endif /* __KERNEL__ */
+
+#define VICE_MAX_DMA_BUFFERS	1024		/* Max number of VICE_PAGE_SIZE pages that can be MMAPed by userland */
+						/* Affects size of page table */
+
+#define VICE_BASE	0x17000000 		/*Physical address...*/
+#define VICE_REG(reg)	(VICE_BASE|(reg))	/*access vice register*/
+#define VICE_IO_MAX_OFFSET	0xEFFF		/* Max offset mapped to registers (TLB is *not* accessible to userspace) */
+#define VICE_MIN_OFFSET	0x10000			/* Min offset mapped to RAM */
+#define VICE_MAX_OFFSET	VICE_MIN_OFFSET+0x800000/* Max offset mapped to RAM */
+
+#ifndef BIT
+#define BIT(x)	(0x1<<x)
+#endif /* !defined BIT */
+/*
+ * VICE Register definitions
+ */
+
+#define VICE_ID		0x0008 /* VICE revision id		size 8  ro */
+#define VICE_CFG	0xE000 /* VICE config register		size 16 rw */
+#define VICE_INT_RESET	0xE008 /* VICE reset interrupt		size 9  wo */
+#define VICE_INT_EN	0xE010 /* VICE interrupt enable		size 9  rw */
+#define HST_BSP_IN_BOX	0x0028 /* Host copy of BSP/MSP inbox	size 16 ro */
+#define HST_BSP_OUT_BOX	0x0030 /* Host copy of BSP/MSP outbox	size 16 ro */
+#define MSP_CTL_STAT	0x0040 /* MSP Control/Status register	size 32 rw */
+#define MSP_EXPT_FLAG	0x0048 /* MSP Exception flag		size 32 rw */
+#define MSP_PC		0x0050 /* MSP Program Counter		size 32 rw */
+#define MSP_BAD_ADDR	0x0058 /* MSP Bad Address		size 32 ro */
+#define MSP_WATCH_POINT	0x0060 /* MSP Watch Point address	size 32 rw */
+#define MSP_EPC		0x0068 /* MSP Exception PC		size 32 ro */
+#define MSP_CAUSE	0x0070 /* MSP Exception Cause		size 32 ro */
+#define BSP_RPAGE	0x0078 /* BSP R Page			size 16 rw */
+#define BSP_SW_INT	0x0080 /* BSP Software Interrupt	size 0  wo */
+#define MSP_D_RAM	0x0100 /* MSP Data RAM Arbitration register size 32 rw */
+#define VICEMSP_COUNT	0x0108 /* MSP Free Running Counter	size 32 ro */
+#define BSP_CTL_STAT	0x0110 /* BSP Control/Status register	size 16 rw */
+#define BSP_WATCH_POINT	0x0118 /* BSP Watch Point		size 16 rw */
+#define BSP_IN_COUNT	0x0120 /* BSP Decoded Bits counter	size 24 ro */
+#define BSP_OUT_COUNT	0x0128 /* BSP Encoded Bits counter	size 24 ro */
+#define BSP_PC		0x0140 /* BSP Program Counter		size 16 rw */
+#define BSP_EPC		0x0148 /* BSP Exception PC		size 16 rw */
+#define BSP_HALT_RESET	0x0150 /* BSP Halt/Reset Register	size 2  ro */
+#define BSP_CAUSE	0x0158 /* BSP Exception Cause		size 16 ro */
+#define VICE_INT	0x0160 /* Interruot and Status		size 9  ro */
+#define BSP_FIFO_CTL_STAT 0x0168 /* BSP FIFO Control/Status	size 6  rw */
+/* 0x170, 0x178 -?? */
+#define DMA_CH1_CTL	0x0180 /* DMA Chennel 1 Control		size 16 rw */
+#define DMA_CH1_STAT	0x0188 /* DMA Channel 1 Status		size 16 ro */
+#define DMA_CH1_DATA	0x0190 /* DMA Channel 1 Fill Pattern	size 16 rw */
+#define DMA_CH1_MEM_PTR	0x0198 /* DMA Channel 1 Sys Mem Ptr	size 32 ro */
+#define DMA_CH1_VICE_PTR 0x01A0 /* DMA Channel 1 VICE Mem Ptr	size 16 ro */
+#define DMA_CH1_COUNT	0x01A8 /* DMA Channel 1 remaining count	size 16 ro */
+/*0x01B0 -- unused */
+#define MSP_SW_INT	0x01B8 /* MSP Software Interrupt	size 0  wo */
+#define DMA_CH2_CTL	0x01C0 /* DMA Chennel 2 Control		size 16 rw */
+#define DMA_CH2_STAT	0x01C8 /* DMA Channel 2 Status		size 16 ro */
+#define DMA_CH2_DATA	0x01D0 /* DMA Channel 2 Fill Pattern	size 16 rw */
+#define DMA_CH2_MEM_PTR	0x01D8 /* DMA Channel 2 Sys Mem Ptr	size 32 ro */
+#define DMA_CH2_VICE_PTR 0x01E0 /* DMA Channel 2 VICE Mem Ptr	size 16 ro */
+#define DMA_CH2_COUNT	0x01E8 /* DMA Channel 2 remaining count	size 16 ro */
+#define BSP_INBOX	0x01F0 /* BSP inbox			size 16 ro */
+#define BSP_OUTBOX	0x01F8 /* BSP outbox			size 16 rw */
+
+/* VICE RAM's */
+#define MSP_IRAM	0x2000 /* MSP instruction RAM base, length 4K */
+#define BSP_IRAM	0x4000 /* BSP instruction RAM base, length 4K */
+#define BSP_TABLE	0x5000 /* BSP Tables, length 8K */
+#define BSP_IO_IN	0x7800 /* BSP Input buffers, length 2K */
+#define BSP_IO_OUT	0x7000 /* BSP Output buffers, length 2K */
+#define VICE_DRAM_A	0x8000 /* Data RAM Bank A, , length 2K */
+#define VICE_DRAM_B	0x8800 /* Data RAM Bank B, , length 2K */
+#define VICE_DRAM_C	0x9000 /* Data RAM Bank C, , length 2K */
+
+/* VICE Interrupt status bits */
+#define VICE_INT_DMA_CH1_DONE	BIT(0)
+#define VICE_INT_DMA_CH1_ERR	BIT(1)
+#define VICE_INT_MSP_SW		BIT(2)	/* MSP wants to interrupt host (Program is finished?) */
+#define VICE_INT_MSP_ERR	BIT(3)	/* MSP exception */
+#define VICE_INT_BSP_SW		BIT(4)	/* BSP wants to interrupt host (Program is finished?) */
+#define VICE_INT_BSP_ERR	BIT(5)	/* BSP exception */
+#define VICE_INT_BUSERR		BIT(6)	/* ?? Erroneous data received through SysAD interface */
+#define VICE_INT_DMA_CH2_DONE	BIT(7)
+#define VICE_INT_DMA_CH2_ERR	BIT(8)
+
+/*
+ * VICE DMA Describtor related definitions
+ */
+
+/* Flags */
+#define VICE_DMA_HALT BIT(15)
+#define VICE_DMA_SKIP BIT(14)
+#define VICE_DMA_TOVICE  BIT(13)	/* 1=transaction is System->VICE, 0=VICE->System */
+#define VICE_DMA_FILL BIT(12)	/* 1=Pattern fill VICE memory from VICEDMA_DATA register \
+				   0=normal VICE<->System transaction */
+/* flags (11:10) */
+#define VICE_DMA_YC_NONE    (0x0<<10) /* Just plain pump it through */
+#define VICE_DMA_YC_422_420 (0x1<<10) /* Y/C 4:2:2 to Y/C 4:2:0 split */
+#define VICE_DMA_YC_422_422 (0x2<<10) /* Y/C 4:2:2 to Y/C 4:2:2 split */
+#define VICE_DMA_YC_422_Y   (0x3<<10) /* Y/C 4:2:2 to Y split -- DMA read only */
+
+/* flags(9:8) */
+#define VICE_DMA_HP_FF	(0x0<<8) /* Full Pel Vert	Full Pel Horz */
+#define VICE_DMA_HP_FH	(0x1<<8) /* Full Pel Vert	Half Pel Horz */
+#define VICE_DMA_HP_HF	(0x2<<8) /* Half Pel Vert	Full Pel Horz */
+#define VICE_DMA_HP_HH	(0x3<<8) /* Half Pel Vert	Half Pel Horz */
+
+#define VICE_DMA_ILV BIT(7) /* 0=Process describtor individually, \
+			       1=Pcocess describtors as pairs and \
+			         interleave them into VICE memory */
+/* Source/Destination location within VICE FLAGS(6:4)*/
+#define VICE_DMA_LOC_DRAMA   (0x0<<4) /* Data RAM A          */
+#define VICE_DMA_LOC_DRAMB   (0x1<<4) /* Data RAM B          */
+#define VICE_DMA_LOC_DRAMC   (0x2<<4) /* Data RAM C          */
+#define VICE_DMA_LOC_MSPI    (0x3<<4) /* MSP Instruction RAM */
+#define VICE_DMA_LOC_BSPI    (0x4<<4) /* BSP Instruction RAM */
+#define VICE_DMA_LOC_BSPTBL  (0x5<<4) /* BSP Table RAM       */
+#define VICE_DMA_LOC_BSPFIFO (0x6<<4) /* BSP Decode FIFO     */
+#define VICE_DMA_LOC_TLB     (0x7<<4) /* DMA TLB RAM         */
+
+#define VICE_DMA_HPEN BIT(3) /* 0=Half Pel mode disabled -- ignore 8:9 */
+
+typedef struct vice_dma_desc
+{
+    u64 flags;		/* See above for definitions of various bits */
+    u64 sys_addr_hi;	/* High word of system memory address */
+    u64 sys_addr_lo;	/* Low word of system memory address */
+    u64 span;		/* Length of one line */
+    u64 stride;		/* Number of bytes to skip between lines */
+    u64 line_count;	/* Number of lines */
+    u64 vice_addr_Y;	/* VICE memory address */
+    u64 vice_addr_C;	/* VICE mem address for Y/C translated mode transfers */
+} vice_dma_desc;
+
+#define DMA_DESCRIBTORS_BASE	0x1000
+#define VICE_DMA_DESC(x)	(DMA_DESCRIBTORS_BASE+((x)*sizeof(vice_dma_desc)))
+
+/*
+ * VICE DMA has eight descriptors -- 4 for each channel
+ */
+#define VICE_DMA_CH1_D1		VICE_DMA_DESC(0)
+#define VICE_DMA_CH1_D2		VICE_DMA_DESC(1)
+#define VICE_DMA_CH1_D3		VICE_DMA_DESC(2)
+#define VICE_DMA_CH1_D4		VICE_DMA_DESC(3)
+#define VICE_DMA_CH2_D1		VICE_DMA_DESC(4)
+#define VICE_DMA_CH2_D2		VICE_DMA_DESC(5)
+#define VICE_DMA_CH2_D3		VICE_DMA_DESC(6)
+#define VICE_DMA_CH2_D4		VICE_DMA_DESC(7)
+
+/* VICE DMA control register bits */
+#define VICE_DMA_CTL_GO		BIT(0) /* Write 1 to kick off DMA */
+#define VICE_DMA_CTL_IE		BIT(1) /* 1=Interrupt on DMA completion, 0=No interrupt */
+#define VICE_DMA_CTL_STOP	BIT(2) /* Write 1 to stop DMA */
+#define VICE_DMA_CTL_RESET	BIT(3) /* 1=Reset DMA engine, write 0 to allow it to run again */
+#define VICE_DMA_CTL_DESC1	BIT(4) /* Start DMA with descriptor 1 */
+#define VICE_DMA_CTL_DESC2	BIT(5) /* Start DMA with descriptor 2 */
+#define VICE_DMA_CTL_DESC3	BIT(6) /* Start DMA with descriptor 3 */
+#define VICE_DMA_CTL_DESC4	BIT(7) /* Start DMA with descriptor 4 */
+#define VICE_DMA_CTL_TLB_BYPASS	BIT(8) /* Bypass TLB for this transaction */
+#define VICE_DMA_CTL_FLUSH_BUF	BIT(9) /* What the hell does this do? */
+
+/*
+ * DMA TLB definitions
+ */
+
+#define VICE_PAGE_SHIFT 16
+#define VICE_PAGE_ORDER 4
+#define VICE_PAGE_SIZE (1<<VICE_PAGE_SHIFT)
+#define VICE_PAGE_MASK 0xFFFF0000	/* VICE DMA TLB works with 64K pages aligned on 64K boundary */
+#define VICE_TLB_OFFSET 0xF000		/* Vice TLB starts here. Range is F000-FFFC */
+#define VICE_TLB_ENTRIES 64		/* Number of TLB entried in VICE */
+
+#define VICE_DMA_LINEAR	0x00800000	/* Linear access to system memory */
+#define VICE_DMA_TILED	0x10800000	/* Tiled access to system memory */
+
+/*
+ * TLB Entry format
+ */
+#define VICE_TLB_VALID		BIT(0)
+#define VICE_TLB_WRITABLE	BIT(1)
+
+/*
+ * MSP definitions
+ */
+
+#define MSP_GO	BIT(0)	/* writing MSP_GO to MSP_CTL_STAT register starts MSP */
+#define MSP_OPERATIONAL BIT(1) /* Actually you have to write 1 to take it out of reset... Ugh */
+
+/*
+ * BSP definitions
+ */
+#define BSP_OPERATIONAL     BIT(0) /* write 1 to take BSP out of reset */
+#define BSP_HALT            BIT(1) /* write 0 to start BSP, write 1 to halt it */
+#define BSP_HALT_ACK        BIT(2) /* reads as 1, when BSP recognised HALT request */
+
+#define BSP_FIFO_CTL_RESET  BIT(2)
+
+#define MAX_BSP_HALT_WAIT              10 /*max time to vait for BSP halt before reset */
+
+/*
+ * VICE IOCTL related definitions
+ */
+#define VICE_RES_STATUS_FREE		0
+#define VICE_RES_STATUS_INPROGRESS	1
+#define VICE_RES_STATUS_DONE		2
+#define VICE_RES_STATUS_ERR		3
+
+
+typedef struct dma_run
+{
+    u32 channel;
+    u32 desc;
+    u32 status;
+} dma_run;
+
+typedef struct msp_run
+{
+    u32 pc; /* PC, where MSP have finished running (either took exception, or did SW int) */
+    u32 reason; /* MSP_EXPT_CAUSE */
+    u32 status; /* Whether MSP took exception or did SW int */
+} msp_run;
+
+typedef struct bsp_run
+{
+    u32 pc;
+    u32 reason;
+    u32 status;
+} bsp_run;
+
+/* Must be written all at once. Should I make a union of it with u32? */
+typedef struct vice_tlb_entry
+{
+    u16 page_num; /* Physical 64K page number */
+    u16 flags; /* Bit 0 - valid, bit 1 writable, rest undefined */
+} vice_tlb_entry;
+
+
+#ifdef __KERNEL__
+struct vice_dev;
+
+typedef struct vice_dev {
+    char is_open;
+    struct semaphore sem;     /* mutual exclusion semaphore     */
+    devfs_handle_t handle;    /* only used if devfs is there */
+    vice_dma_desc* ch1;       /* current DMA decriptor for channel 1 */
+    vice_dma_desc* ch2;       /* current DMA decriptor for channel 2 */
+
+    u32 ch1_dma_stat;         /* Various flags related to DMA in progress */
+    u32 ch2_dma_stat;         /* Various flags related to DMA in progress */
+
+    spinlock_t dma_lock[2];   /* spinlocks for accessing dma status for 2 VICE DMA channels */
+    u32 dma_status[2];        /* status of dma channels */
+
+    dma_addr_t dma_mem[VICE_TLB_ENTRIES*2]; /* 2 sets 64*64K pages, used for DMA to/from VICE */
+    void* dma_kmem[VICE_TLB_ENTRIES*2]; /* 2 sets 64*64K pages, used for DMA to/from VICE */
+
+    /*
+    vice_page *page_table;
+    unsigned int page_cnt;
+    */
+    /* MSP stuff */
+    u32 msp_pc;			/* PC where MSP stopped (EPC) */
+    u32 msp_int_reason;		/* Reason MSP stopped */
+    u32 msp_status;		/* Free/Working/Done/Error */
+    spinlock_t msp_lock;	/* spinlock for accessing MSP status */
+
+    /* BSP stuff */
+    u32 bsp_pc;			/* PC where BSP stopped (EPC) */
+    u32 bsp_int_reason;		/* Reason BSP stopped */
+    u32 bsp_status;		/* Free/Working/Done/Error */
+    spinlock_t bsp_lock;	/* spinlock for accessing BSP status */
+} vice_dev;
+
+#endif /* __KERNEL__ */
+
+#define VICE_DMA_STAT_DATA	BIT(0)
+#define VICE_DMA_STAT_MSP_CODE	BIT(1)
+#define VICE_DMA_STAT_BSP_CODE	BIT(2)
+#define VICE_DMA_STAT_BSP_TBL	BIT(3)
+#define VICE_DMA_STAT_DIR	BIT(4)	/* 0 - to VICE, 1 to system */
+
+/*
+ * VICE ioctl commands
+ */
+#ifdef __KERNEL__
+#define VICE_IOCTL_MAGIC	0x96
+#define VICE_IOCTL_MAP_DMA	_IOR(VICE_IOCTL_MAGIC,1,unsigned long)
+#define VICE_IOCTL_MSP_RUN	_IOR(VICE_IOCTL_MAGIC,2,msp_run)
+#define VICE_IOCTL_BSP_RUN	_IOR(VICE_IOCTL_MAGIC,3,bsp_run)
+#define VICE_IOCTL_DO_DMA	_IOWR(VICE_IOCTL_MAGIC,4,dma_run)
+#else
+#define VICE_IOCTL_MAP_DMA	0x40089601
+#define VICE_IOCTL_MSP_RUN	0x400c9602
+#define VICE_IOCTL_BSP_RUN	0x400c9603
+#define VICE_IOCTL_DO_DMA	0xc00c9604
+#endif
+
+#ifdef __KERNEL__
+/* Vice wait queue */
+//Each unit has it's own wait_queue, as they might all sleep separately
+//extern wait_queue_head_t dma_wq;
+
+static inline void vice_write_reg(u32 reg,u64 value)
+{
+    *(volatile u64*)(KSEG1ADDR(VICE_REG(reg)))=value;
+}
+static inline u64 vice_read_reg(u32 reg)
+{
+    return *(volatile u64*)(KSEG1ADDR(VICE_REG(reg)));
+}
+
+static inline void vice_write_32(u32 addr,u32 value)
+{
+    *(volatile u32*)(KSEG1ADDR(VICE_REG(addr)))=value;
+}
+static inline u32 vice_read_32(u32 addr)
+{
+    return *(volatile u32*)(KSEG1ADDR(VICE_REG(addr)));
+}
+
+int vice_dma_map_set(vice_dev *vice,unsigned long set);
+
+/*
+ * Some DMA-related inline functions
+ */
+
+static inline int vice_dma_mem_init(vice_dev *vice)
+{
+    int i;
+    for (i=0; i<64*2;i++){
+	if(!(vice->dma_kmem[i]=pci_alloc_consistent(0,VICE_PAGE_SIZE,&(vice->dma_mem[i])))) {
+	    DPRINTK("failed at page# %i\n",i);
+    	    return -ENOMEM;
+	}
+    }
+    return 0;
+}
+static inline void vice_dma_mem_free(vice_dev *vice)
+{
+    int i;
+    for (i=0; i<64*2;i++){
+	if(vice->dma_kmem[i]) {
+	    pci_free_consistent(0,VICE_PAGE_ORDER,vice->dma_kmem[i],vice->dma_mem[i]);
+	    vice->dma_kmem[i]=0;
+	    vice->dma_mem[i]=0;
+	}
+    }
+}
+
+int vice_msp_init(vice_dev* vice);
+int vice_bsp_init(vice_dev* vice);
+int vice_dma_init(vice_dev* vice);
+
+void vice_msp_reset(vice_dev* vice);
+void vice_bsp_reset(vice_dev* vice);
+void vice_dma_reset(vice_dev* vice);
+
+void vice_msp_cleanup(vice_dev* vice);
+void vice_bsp_cleanup(vice_dev* vice);
+void vice_dma_cleanup(vice_dev* vice);
+
+void vice_dma_done(vice_dev* vice, int channel);
+void vice_dma_err(vice_dev* vice, int channel);
+void vice_handle_msp_int(vice_dev* vice);
+void vice_handle_msp_err(vice_dev* vice);
+void vice_handle_bsp_int(vice_dev* vice);
+void vice_handle_bsp_err(vice_dev* vice);
+void vice_handle_bus_err(vice_dev* vice);
+
+int vice_dma_run(vice_dev* vice,dma_run* run);
+int vice_msp_run(vice_dev* vice,msp_run* run);
+int vice_bsp_run(vice_dev* vice,bsp_run* run);
+#endif /* __KERNEL__ */
+
+#endif /* _VICE_H_ */
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/bsp.c	Tue Dec 10 09:54:48 2002
@@ -0,0 +1,161 @@
+/*
+ *
+ * Copyright (C) 2002 Ilya Volynets
+ *	Sponsored by Total Knowledge
+ *	http://www.total-knowledge.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *=======================================================================
+ * 09.16.2002	iluxa
+ *	- skeleton only (I don't have instruction set for BSP, so there
+ *	  is no way I can test it).
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>   /* printk() */
+#include <asm/page.h>
+#include <linux/vmalloc.h>   /* kmalloc() */
+#include <linux/fs.h>       /* everything... */
+#include <linux/errno.h>    /* error codes */
+#include <linux/types.h>    /* size_t */
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>    /* O_ACCMODE */
+
+#include <asm/system.h>     /* cli(), *_flags */
+#include <asm/pci.h>
+#include <asm/uaccess.h>    /* put_user & friends */
+#include <asm/delay.h>
+
+/*
+ * The file operations for the bsp device
+ * (some are overlayed with primary vice)
+ */
+
+#include <linux/vice.h>
+
+
+/* wait queue to wait on while BSP runs */
+static DECLARE_WAIT_QUEUE_HEAD(wq);
+
+void vice_bsp_reset(vice_dev* vice);
+
+/*
+ * Loads BSP PC with value form vice->bsp_pc, takes bsp out of reset
+ * state (just in case?) and kicks off execution.
+ */
+static inline void bsp_go(vice_dev* vice)
+{
+	vice_write_reg(BSP_HALT_RESET,BSP_OPERATIONAL); /* BSP_HALT=0 to start */
+}
+
+static inline void vice_bsp_stop()
+{
+    int i=0;
+    u64 ctl=vice_read_reg(BSP_HALT_RESET)|BSP_HALT;
+    vice_write_reg(BSP_HALT_RESET,ctl);
+    while(!vice_read_reg(BSP_HALT_RESET)&BSP_HALT_ACK) {
+	    if (++i>MAX_BSP_HALT_WAIT) {
+		    printk(KERN_WARNING "o2vice: timeout stopping bsp, bsp reset\n");
+		    vice_bsp_reset(0);/*FIXME: pass vice* arrond*/
+	    }
+	    udelay(16);
+    }
+}
+
+int vice_bsp_init(struct vice_dev* vice)
+{
+    spin_lock_init(&vice->dma_lock[1]);
+    return 0;
+}
+
+void vice_bsp_reset(vice_dev* vice)
+{
+    vice_write_reg(BSP_HALT_RESET,0);
+    vice_write_reg(BSP_FIFO_CTL_STAT, BSP_FIFO_CTL_RESET);
+    udelay(1);
+    vice_write_reg(BSP_HALT_RESET, BSP_OPERATIONAL|BSP_HALT);
+    vice_write_reg(BSP_FIFO_CTL_STAT,0);
+}
+void vice_bsp_cleanup(vice_dev* vice)
+{
+	vice_bsp_stop();
+}
+
+void vice_handle_bsp_int(vice_dev* vice)
+{
+    DPRINTK("Ah! We are done with BSP!\n");
+    if(vice->bsp_status!=VICE_RES_STATUS_INPROGRESS) {
+	DPRINTK("Ugh... BSP interrupt while BSP isn't started from driver!\n");
+	return;
+    }
+    vice->bsp_status=VICE_RES_STATUS_DONE;
+    vice->bsp_pc=-1; /* No exception, no EPC, and PC is probably
+			not one which executed Exception instruction */
+    vice->bsp_int_reason=vice_read_reg(BSP_CAUSE);
+    wake_up_interruptible(&wq);
+}
+void vice_handle_bsp_err(vice_dev* vice)
+{
+    DPRINTK("Ouch! BSP Exception!\n");
+    if(vice->bsp_status!=VICE_RES_STATUS_INPROGRESS) {
+	DPRINTK("Ugh... BSP exception while BSP isn't started from driver!\n");
+	return;
+    }
+    vice->bsp_status=VICE_RES_STATUS_ERR;
+    vice->bsp_pc=(u32)vice_read_reg(BSP_EPC);
+    vice->bsp_int_reason=vice_read_reg(BSP_CAUSE);
+    wake_up_interruptible(&wq);
+}
+
+int vice_bsp_run(vice_dev* vice, bsp_run* result)
+{
+    bsp_run r;
+    if(!access_ok(VERIFY_WRITE,result,sizeof(bsp_run)))
+	return -EFAULT;
+    DPRINTK("Checking for BSP status\n");
+    spin_lock_irq(vice->bsp_lock);
+    if(vice->bsp_status!=VICE_RES_STATUS_FREE) {
+	spin_unlock_irq(vice->bsp_lock);
+	return -EBUSY;
+    }
+    DPRINTK("BSP is free\n");
+    vice->bsp_status=VICE_RES_STATUS_INPROGRESS;
+    spin_unlock_irq(vice->bsp_lock);
+    DPRINTK("Kicking BSP off\n");
+    bsp_go(vice);
+    /*
+     * Sleep, untill BSP interrupts us...
+     *
+     * No spinlock is needed...
+     */
+    DPRINTK("Falling asleep\n");
+    while(vice->bsp_status==VICE_RES_STATUS_INPROGRESS) {
+        interruptible_sleep_on(&wq);
+	DPRINTK("Huh? Where am I?\n");
+	if(signal_pending(current))break;
+    }
+    DPRINTK("*yawn* obviously waking up....\n");
+    copy_from_user(&r,result,sizeof(r));
+    DPRINTK("r.reason=%x, r.pc=%x, r.status=%x\n",r.reason,r.pc,r.status);
+    r.status=vice->bsp_status;
+    vice->bsp_status=VICE_RES_STATUS_FREE;
+    r.pc=vice->bsp_pc;
+    r.reason=vice->bsp_int_reason;
+    DPRINTK("r.reason=%x, r.pc=%x, r.status=%x\n",r.reason,r.pc,r.status);
+    return copy_to_user(result,&r,sizeof(r));
+}
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/msp.c	Tue Dec 10 09:55:35 2002
@@ -0,0 +1,157 @@
+/*
+ *
+ * Copyright (C) 2002 Ilya Volynets
+ *	Sponsored by Total Knowledge
+ *	http://www.total-knowledge.com
+ *
+ * Development of this code was made possible by generous contribution
+ * from Total Knowledge (http://www.total-knowledge.com/)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * 09.16.2002	iluxa
+ *	- first rough cut. basic MSP operations supported
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>   /* printk() */
+#include <asm/page.h>
+#include <linux/vmalloc.h>   /* kmalloc() */
+#include <linux/fs.h>       /* everything... */
+#include <linux/errno.h>    /* error codes */
+#include <linux/types.h>    /* size_t */
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>    /* O_ACCMODE */
+
+#include <asm/system.h>     /* cli(), *_flags */
+#include <asm/pci.h>
+#include <asm/uaccess.h>    /* put_user & friends */
+#include <asm/delay.h>
+
+/*
+ * The file operations for the msp device
+ * (some are overlayed with primary vice)
+ */
+
+#include <linux/vice.h>
+
+/* Statically allocate wait queue */
+static DECLARE_WAIT_QUEUE_HEAD(wq);
+
+/*
+ * Loads MSP PC with value form msp->pc, takes msp out of reset
+ * state (just in case?) and kicks off execution.
+ */
+static inline void msp_go(vice_dev* vice)
+{
+    vice_write_reg(MSP_CTL_STAT,MSP_GO|MSP_OPERATIONAL);
+}
+
+static inline void vice_msp_stop(void)
+{
+    u64 ctl=vice_read_reg(MSP_CTL_STAT)&(~MSP_GO);
+    vice_write_reg(MSP_CTL_STAT,ctl);
+}
+
+int vice_msp_run(vice_dev *vice, msp_run* result)
+{
+    msp_run r;
+    if(!access_ok(VERIFY_WRITE,result,sizeof(msp_run)))
+	return -EFAULT;
+    DPRINTK("Checking for MSP status\n");
+    spin_lock_irq(vice->msp_lock);
+    if(vice->msp_status!=VICE_RES_STATUS_FREE) {
+	spin_unlock_irq(vice->msp_lock);
+	return -EBUSY;
+    }
+    DPRINTK("MSP is free\n");
+    vice->msp_status=VICE_RES_STATUS_INPROGRESS;
+    spin_unlock_irq(vice->msp_lock);
+    DPRINTK("Kicking MSP off\n");
+    msp_go(vice);
+    /*
+     * Sleep, untill MSP interrupts us...
+     *
+     * No spinlock is needed...
+     */
+    DPRINTK("Falling asleep\n");
+    while(vice->msp_status==VICE_RES_STATUS_INPROGRESS) {
+        interruptible_sleep_on(&wq);
+	DPRINTK("Huh? Where am I?\n");
+	if(signal_pending(current))break;
+    }
+    DPRINTK("*yawn* obviously waking up....\n");
+    copy_from_user(&r,result,sizeof(r));
+    DPRINTK("r.reason=%x, r.pc=%x, r.status=%x\n",r.reason,r.pc,r.status);
+    r.status=vice->msp_status;
+    vice->msp_status=VICE_RES_STATUS_FREE;
+    r.pc=vice->msp_pc;
+    r.reason=vice->msp_int_reason;
+    DPRINTK("r.reason=%x, r.pc=%x, r.status=%x\n",r.reason,r.pc,r.status);
+    return copy_to_user(result,&r,sizeof(r));
+}
+
+void vice_handle_msp_int(vice_dev* vice)
+{
+    DPRINTK("Ah! We are done with MSP!\n");
+    if(vice->msp_status!=VICE_RES_STATUS_INPROGRESS) {
+	DPRINTK("Ugh... MSP interrupt while MSP isn't started from driver!\n");
+	return;
+    }
+    vice->msp_status=VICE_RES_STATUS_DONE;
+    vice->msp_pc=-1; /* No exception, no EPC, and PC is probably
+			not one which executed Exception instruction */
+    vice->msp_int_reason=vice_read_reg(MSP_EXPT_FLAG);
+    wake_up_interruptible(&wq);
+}
+void vice_handle_msp_err(vice_dev* vice)
+{
+    DPRINTK("Ouch! MSP Exception!\n");
+    if(vice->msp_status!=VICE_RES_STATUS_INPROGRESS) {
+	DPRINTK("Ugh... MSP exception while MSP isn't started from driver!\n");
+	return;
+    }
+    vice->msp_status=VICE_RES_STATUS_ERR;
+    vice->msp_pc=(u32)vice_read_reg(MSP_EPC);
+    vice->msp_int_reason=vice_read_reg(MSP_EXPT_FLAG);
+    /* clear any exception bits */
+    vice_write_reg(MSP_EXPT_FLAG,0x00);
+    wake_up_interruptible(&wq);
+}
+
+int vice_msp_init(struct vice_dev* vice)
+{
+    spin_lock_init(&vice->dma_lock[0]);
+    return 0;
+}
+
+void vice_msp_reset(vice_dev *vice)
+{
+    /* start reset */
+    vice_write_reg(MSP_CTL_STAT,0);
+    /* wait for reset to complete */
+    udelay(1);
+    /* take out of reset, and prepare to go */
+    vice_write_reg(MSP_CTL_STAT,MSP_OPERATIONAL);
+    /* let MSP access all VICE internal RAM */
+    vice_write_reg(MSP_D_RAM,0x7);
+}
+
+void vice_msp_cleanup(vice_dev* vice)
+{
+    vice_msp_stop();
+}
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/Kconfig	Sat Nov  2 14:10:16 2002
@@ -0,0 +1,32 @@
+#
+# O2 VICE Engine confiuration
+#
+
+config O2_VICE
+    tristate "O2 VICE Engine Support"
+    depends on SGI_IP32
+    ---help---
+      This option enables O2 VICE Engine support.
+      VICE stands for Video Image Compression Engine. This is very powerfull
+      piece of silicon, that can greatly speed up lots of graphics, vide, or
+      sound related tasks. To be able to use it, you will also need special
+      library, that can be found at <insert URL here>
+
+config O2_VICE_DBGG
+    bool "VICE Debugger Support. READ HELP!"
+    depends on O2_VICE
+    ---help---
+      This option enables features of VICE driver needed to debug VICE library.
+      This is probably serious security risk. You don't need it. If you think
+      you do, you are wrong. Say NO.
+
+config O2_VICE_DBG
+    bool "You seem to insist... did you read help? Yes? No? READ HELP!"
+    depends on O2_VICE_DBGG
+    ---help---
+      You are still here? Didn't I just tell you that it is not needed?
+      Or do you want to say you *legally* obtained information needed for
+      programming VICE? That you got all the tools needed? As a matter of
+      fact, these tools don't even exist yet!
+
+      Sigh... You've been warned...
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/Makefile	Thu Sep 12 00:12:16 2002
@@ -0,0 +1,21 @@
+#
+# drivers/char/o2vice/Makefile
+#
+# Makefile for the O2 VICE Engine driver.
+#
+
+SUB_DIRS     := 
+MOD_SUB_DIRS := $(SUB_DIRS)
+ALL_SUB_DIRS := $(SUB_DIRS)
+
+#O_TARGET := vice.o
+
+obj-y		:=
+obj-m		:=
+obj-n		:=
+obj-		:=
+
+obj-$(CONFIG_O2_VICE)	+= main.o msp.o bsp.o dma.o
+#obj-$(CONFIG_O2_VICE_DBG) += vicedebug.o
+
+include $(TOPDIR)/Rules.make
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/main.c	Tue Dec 10 09:55:59 2002
@@ -0,0 +1,438 @@
+/*
+ * main.c -- SGI O2 VICE driver
+ *
+ * The code skeleton came from the book "Linux Device
+ * Drivers" by Alessandro Rubini and Jonathan Corbet, published
+ * by O'Reilly & Associates.   No warranty is attached;
+ * we cannot take responsibility for errors or fitness for use.
+ *
+ * Copyright (C) 2002 Ilya Volynets.
+ *	Sponsored by Total Knowledge
+ *	http://www.total-knowledge.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *======================================================================
+ * 09.16.2002	iluxa
+ *	- first rough cut is ready.
+ */
+
+/*
+ * When debugging support is turned off, there will be no access to most of
+ * VICE I/O space. No PIO access to ram and buffers for sure, as acceessing
+ * some of "unimplemented" regions seems to halt system completely. (Is CPU
+ * just stalling, waiting for data to be returned, instead of getting error?)
+ * Safe registers are first 4K (control registers?) and next 4K with DMA
+ * describtors.
+ * Well, I could give access to correct pages through "nopage" method...
+ * Then accessing "reserved" regions would give SIG_BUS...
+ * Data ram would be problem: there are 3 2K regions, which either makes
+ * only 2 banks accessible to userspace, or none at all (giving non-root user
+ * an option to randomly hang system is not an option :)
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>		/* module_(init|exit) */
+
+#include <linux/kernel.h>	/* printk() */
+#include <asm/page.h>
+#include <linux/vmalloc.h>	/* kmalloc() */
+#include <linux/fs.h>		/* everything... */
+#include <linux/errno.h>	/* error codes */
+#include <linux/types.h>	/* size_t */
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>	/* O_ACCMODE */
+
+#include <asm/system.h>		/* cli(), *_flags */
+
+#include <linux/mm.h>
+
+#include <linux/vice.h>		/* local definitions */
+
+#include <asm/ip32/ip32_ints.h>
+
+int vice_major = VICE_MAJOR;
+
+MODULE_PARM(vice_major, "i");
+MODULE_AUTHOR("Ilya Volynets");
+
+const char *vice_str="vice";
+
+/*
+ * Different minors behave differently, so let's use multiple fops
+ */
+
+
+void *vice_device;	/* holds pointer to vice state (allocated in module_init) */
+
+/*
+ * vice_reset -- restes VICE engine
+ */
+int vice_reset(vice_dev * dev)
+{
+    vice_bsp_reset(dev);
+    vice_msp_reset(dev);
+    vice_dma_reset(dev);
+    return 0;
+}
+
+void vice_handle_buserr(vice_dev* vice)
+{
+    printk(KERN_WARNING "vice: received \"Erroneous data\" interrupt.\n");
+    printk(KERN_WARNING "\tUnfortunately I (Ilya Volynets) Have no idea what is it, so I'm simply ignoring it.\n");
+}
+
+static void vice_interrupt(int irq, void *dev_id, struct pt_regs *pregs)
+{
+    struct vice_dev *vice = (struct vice_dev *) dev_id;
+    u64 status;
+    DPRINTK("irq!\n");
+    status=vice_read_reg(VICE_INT);
+
+    if (!vice /*paranoid */ ) {
+	DPRINTK ("Paranoja ouch!\n");
+	return;
+    }
+
+    DPRINTK("Interrupt, status %016lx...\n", status);
+    if (status & VICE_INT_DMA_CH1_DONE)
+	vice_dma_done(vice,0);
+    if (status & VICE_INT_DMA_CH1_ERR)
+	vice_dma_err(vice,0);
+    if (status & VICE_INT_DMA_CH2_DONE)
+	vice_dma_done(vice,1);
+    if (status & VICE_INT_DMA_CH2_ERR)
+	vice_dma_err(vice,1);
+    if (status & VICE_INT_MSP_SW)
+	vice_handle_msp_int(vice);
+    if (status & VICE_INT_MSP_ERR)
+	vice_handle_msp_err(vice);
+    if (status & VICE_INT_BSP_SW)
+	vice_handle_bsp_int(vice);
+    if (status & VICE_INT_BSP_ERR)
+	vice_handle_bsp_err(vice);
+    if (status & VICE_INT_BUSERR)
+	vice_handle_buserr(vice);
+
+    vice_write_reg(VICE_INT_RESET,0x1FF);	/* clear handled interrupts */
+}
+
+/*
+ * Open and close
+ */
+
+/* In vice_open, the fop_array is used according to TYPE(dev) */
+int vice_open(struct inode *inode, struct file *filp)
+{
+    vice_dev *vice=vice_device;		/* device information */
+    int res;
+
+    MOD_INC_USE_COUNT;		/* Before we maybe sleep */
+
+    if(vice->is_open)
+	return -EBUSY;
+
+    if (!filp->private_data) {
+	filp->private_data = vice_device;
+    }
+
+    vice_reset(vice);
+
+    if ((res=request_irq(CRIME_VICE_IRQ, vice_interrupt, SA_SHIRQ, vice_str, vice))) {
+	printk(KERN_ERR "vice: Can't get irq %x: res=%i\n", (unsigned int)CRIME_VICE_INT, res);
+	return res;
+    }
+
+    /*Actual device init goes in here */
+
+    {
+	int ret;
+	if((ret=vice_dma_mem_init(vice))!=0) {
+	    DPRINTK("Failure allocating VICE I/O buffers...\n");
+	    vice_dma_mem_free(vice);
+	    DPRINTK("Freed already-allocated memory...\n");
+	    return ret;
+	}
+	/* enable interrupts in VICE */
+        vice_write_reg(VICE_INT_RESET,0x1FF); /* clear pending interrupts */
+	vice_write_reg(VICE_INT_EN,0x1FF);
+    }
+    vice->is_open=1;
+    return 0;			/* success */
+}
+
+int vice_release(struct inode *inode, struct file *filp)
+{
+    vice_dev *vice=(vice_dev*)filp->private_data;
+
+    DPRINTK("closing down\n");
+    if(!vice->is_open) {
+	DPRINTK("Uuoouuuuch! Closing unopen file!!!!\n");
+	return -EINVAL; /*? Should I return something else? -ENOTOPEN? */
+    }
+    /* disable interrupts in VICE */
+    vice_write_reg(VICE_INT_EN,0x000);
+    free_irq(CRIME_VICE_IRQ, vice);
+    vice_dma_mem_free(vice);
+    vice_reset(vice);
+    vice->is_open=0;
+    MOD_DEC_USE_COUNT;
+    return 0;
+}
+
+/*
+ * Data management: read and write
+ */
+
+ssize_t vice_read(struct file * filp, char *buf, size_t count, loff_t * f_pos)
+{
+    printk(KERN_WARNING
+	   "Processing bit streams through reading/writing is not supported yet\n");
+    return -ENOSYS;
+}
+
+ssize_t vice_write(struct file * filp, const char *buf, size_t count,
+	   loff_t * f_pos)
+{
+    printk(KERN_WARNING
+	   "Processing bit streams through reading/writing is not supported (yet)\n");
+    return -ENOSYS;
+}
+
+/*
+ * The ioctl() implementation
+ */
+
+int vice_ioctl(struct inode *inode, struct file *filp,
+	   unsigned int cmd, unsigned long arg)
+{
+    vice_dev *vice=(vice_dev*)filp->private_data;
+
+    switch(cmd) {
+    case VICE_IOCTL_MAP_DMA:
+	return vice_dma_map_set(vice,arg);
+    case VICE_IOCTL_MSP_RUN:
+	return vice_msp_run(vice,(msp_run*)arg);
+    case VICE_IOCTL_BSP_RUN:
+	return vice_bsp_run(vice,(bsp_run*)arg);
+    case VICE_IOCTL_DO_DMA:
+	return vice_dma_run(vice,(dma_run*)arg);
+    default:
+	return -ENOTTY;
+    }
+    return 0;
+}
+
+/*
+ * Common VMA ops.
+ */
+
+static void vice_vma_open(struct vm_area_struct *vma)
+{ MOD_INC_USE_COUNT; }
+
+static void vice_vma_close(struct vm_area_struct *vma)
+{ MOD_DEC_USE_COUNT; }
+/*
+ * All it does is find 4K page in one of 64K pages from vice->dev_mem
+ * There is no need to worry about I/O addresses here, since they are remap_page_ranged
+ * on initial mmap....
+ */
+struct page* vice_vma_nopage(struct vm_area_struct *vma,unsigned long address, int write)
+{
+    vice_dev *vice=(vice_dev*)vma->vm_private_data;
+    unsigned long fkpn=((address-vma->vm_start)>>PAGE_SHIFT)+
+	    (vma->vm_pgoff-(VICE_MIN_OFFSET>>PAGE_SHIFT));
+    unsigned long v_pn=fkpn>>VICE_PAGE_ORDER;
+    unsigned long kaddr;
+    struct page *pgptr;
+    if(v_pn>=sizeof(vice->dma_mem)/sizeof(vice->dma_mem[0]))
+	return NOPAGE_SIGBUS;
+    kaddr=(unsigned long)KSEG0ADDR(vice->dma_kmem[v_pn])+((fkpn-(v_pn<<VICE_PAGE_ORDER))<<PAGE_SHIFT);
+    pgptr=virt_to_page(vice->dma_kmem[v_pn]);
+    get_page(pgptr);
+    return virt_to_page(kaddr);
+}
+
+static struct vm_operations_struct vice_vm_ops = {
+    open:  vice_vma_open,
+    close: vice_vma_close,
+    nopage: vice_vma_nopage,
+};
+
+/*
+ * mmap I/O registers of VICE. Called when region is in 0-VICE_IO_MAX range.
+ */
+static inline int vice_io_mmap( struct vm_area_struct *vma)
+{
+    unsigned long offset=vma->vm_pgoff<<PAGE_SHIFT;
+    if(offset+vma->vm_end-vma->vm_start>VICE_IO_MAX_OFFSET+1) {
+	DPRINTK("invalid offset: %lu,length=%lx\n",offset,vma->vm_end-vma->vm_start);
+	return -EINVAL;
+    }
+    vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+    vma->vm_flags |= VM_IO|VM_RESERVED;
+    flush_cache_all();
+    return remap_page_range(vma,vma->vm_start,VICE_BASE+offset,vma->vm_end-vma->vm_start,vma->vm_page_prot);
+}
+/*
+ * mmap I/O buffers. Called when region is above VICE_IO_MAX.
+ */
+
+static inline int vice_buffer_mmap( struct file* filep, struct vm_area_struct *vma)
+{
+    vice_dev *vice=(vice_dev*)filep->private_data;
+    unsigned long offset=vma->vm_pgoff<<PAGE_SHIFT;
+
+    /* must be VICE_PAGE aligned (64K) and size must be ... by 64K */
+    if (offset&0xFFFF||(vma->vm_end-vma->vm_start)&0xFFFF)
+	return -ENXIO; /* alignment error? */
+
+    vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+    vma->vm_flags |= VM_IO|VM_RESERVED;
+
+    vma->vm_private_data=vice;
+    vma->vm_file = filep;
+    return 0;
+}
+
+static int vice_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+    unsigned long offset=vma->vm_pgoff<<PAGE_SHIFT;
+    vma->vm_ops = &vice_vm_ops;
+    if(offset<=VICE_IO_MAX_OFFSET)
+	return vice_io_mmap(vma);
+    else if(offset>=VICE_MIN_OFFSET&&offset+vma->vm_end-vma->vm_start<=VICE_MAX_OFFSET)
+	return vice_buffer_mmap(filp,vma);
+    else
+	return -EINVAL;
+    vice_vma_open(vma);
+}
+
+struct file_operations vice_fops = {
+    read:vice_read,
+    write:vice_write,
+    ioctl:vice_ioctl,
+    open:vice_open,
+    release:vice_release,
+    mmap:vice_mmap,
+};
+
+/*
+ * Finally, the module stuff
+ */
+
+#ifdef CONFIG_DEVFS_FS
+devfs_handle_t vice_devfs_dir;
+static char devname[4];
+#endif
+
+/*
+ * The cleanup function is used to handle initialization failures as well.
+ * Thefore, it must be careful to work correctly even if some of the items
+ * have not been initialized
+ */
+void vice_cleanup_module(void)
+{
+#ifndef CONFIG_DEVFS_FS
+    /* cleanup_module is never called if registering failed */
+    unregister_chrdev(vice_major, "vice");
+#endif
+
+    /* Cleanup MSP/BSP/DMA */
+    /* This really should be done in close.. */
+    vice_msp_cleanup(vice_device);
+    vice_bsp_cleanup(vice_device);
+    vice_dma_cleanup(vice_device);
+
+    /* Clean up DMA and other HW */
+
+    if (vice_device) {
+	kfree(vice_device);
+    }
+#ifdef CONFIG_DEVFS_FS
+    /* once again, only for devfs */
+    devfs_unregister(vice_devfs_dir);
+#endif
+}
+
+
+int vice_init_module(void)
+{
+    int result;
+    vice_dev *vice;
+
+    SET_MODULE_OWNER(&vice_fops);
+#ifdef CONFIG_DEVFS_FS
+    /* If we have devfs, create /dev/vice to put files in there */
+    vice_devfs_dir = devfs_mk_dir(NULL, "vice", NULL);
+    if (!vice_devfs_dir)
+	return -EBUSY;		/* problem */
+
+#else				/* no devfs, do it the "classic" way  */
+
+    /*
+     * Register your major, and accept a dynamic number. This is the
+     * first thing to do, in order to avoid releasing other module's
+     * fops in vice_cleanup_module()
+     */
+    result = register_chrdev(vice_major, "vice", &vice_fops);
+    if (result < 0) {
+	printk(KERN_WARNING "vice: can't get major %d\n", vice_major);
+	return result;
+    }
+    if (vice_major == 0)
+	vice_major = result;	/* dynamic */
+
+#endif				/* CONFIG_DEVFS_FS */
+    /* 
+     * allocate the devices -- we could have them static, but... I dunno...
+     */
+    vice = kmalloc(sizeof(vice_dev), GFP_KERNEL);
+    if (!vice) {
+	result = -ENOMEM;
+	goto fail;
+    }
+    vice_device = vice;
+    memset(vice, 0, sizeof(vice_dev));
+#ifdef CONFIG_DEVFS_FS
+    devfs_register(vice_devfs_dir, "vice",
+		   DEVFS_FL_AUTO_DEVNUM,
+		   0, 0, S_IFCHR | S_IRUGO | S_IWUGO, &vice_fops, vice);
+#endif
+    if ((result = vice_dma_init(vice)))
+	goto fail;
+    /* Initialize MSP & BSP */
+    if ((result = vice_msp_init(vice)))
+	goto fail;
+    if ((result = vice_bsp_init(vice)))
+	goto fail;
+
+#ifndef VICE_DEBUG
+    EXPORT_NO_SYMBOLS;		/* otherwise, leave global symbols visible */
+#endif
+
+    vice_write_reg(VICE_ID,0xfffff);
+#define ID_BITS 0xF
+    printk("SGI O2 VICE rev. %ld\n", vice_read_reg(VICE_ID)&ID_BITS);
+    return 0;			/* succeed */
+
+  fail:
+    vice_cleanup_module();
+    return result;
+}
+
+module_init(vice_init_module);
+module_exit(vice_cleanup_module);
--- /dev/null	Sun Jul 17 16:46:18 1994
+++ drivers/char/o2vice/dma.c	Sat Nov  2 16:36:05 2002
@@ -0,0 +1,183 @@
+/*
+ *
+ * Copyright (C) 2002 Ilya Volynets
+ *	Sponsored by Total Knowledge
+ *	http://www.total-knowledge.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *======================================================================
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>   /* printk() */
+#include <asm/page.h>
+#include <linux/vmalloc.h>  /* kmalloc() */
+#include <linux/fs.h>       /* everything... */
+#include <linux/errno.h>    /* error codes */
+#include <linux/types.h>    /* size_t */
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>    /* O_ACCMODE */
+#include <linux/sched.h>
+
+#include <asm/system.h>     /* cli(), *_flags */
+#include <asm/pci.h>
+#include <asm/uaccess.h>    /* put_user & friends */
+#include <asm/delay.h>
+
+#include <asm/errno.h>
+#include <asm/addrspace.h>
+
+/*
+ * VICE DMA support
+ */
+
+#include <linux/vice.h>
+
+/* wait queue to sleep on, while waiting for DMA */
+static DECLARE_WAIT_QUEUE_HEAD(wq);
+
+
+/*
+ * Maps one of 4M sets into VICE TLB.
+ * Currently set# can be either 0 or 1
+ */
+int vice_dma_map_set(vice_dev *vice,unsigned long set)
+{
+    unsigned long *page_set;
+    int i;
+    /* either map in 0th or 1st set (for now....) */
+    if(set>=2)
+	return -EINVAL;
+    page_set=&(vice->dma_mem[VICE_TLB_ENTRIES*set]);
+    for(i=0; i<VICE_TLB_ENTRIES; i++) {
+	vice_write_reg(VICE_TLB_OFFSET+(i<<3), page_set[i]|VICE_TLB_VALID|VICE_TLB_WRITABLE);
+    }
+    for(i=0; i<VICE_TLB_ENTRIES; i++) {
+	printk("%016lx ",vice_read_reg(VICE_TLB_OFFSET+(i<<3)));
+    }
+    printk("\n");
+    return 0;
+}
+
+/*
+ * Unmaps all pages from VICE TLB
+ */
+int vice_dma_clear_tlb(vice_dev *vice)
+{
+    int i;
+    for(i=0; i<VICE_TLB_ENTRIES; i++) {
+	vice_write_32(VICE_TLB_OFFSET+(i<<2), 0);
+    }
+    return 0;
+}
+
+int vice_dma_init(vice_dev* vice)
+{
+    int ret=0;
+    spin_lock_init(&vice->dma_lock[0]);
+    spin_lock_init(&vice->dma_lock[1]);
+    return ret;
+}
+
+int vice_dma_run(vice_dev* vice,dma_run* run)
+{
+    dma_run r;
+    if(copy_from_user(&r,run,sizeof(r)))
+	return -EINVAL;
+    if(r.channel>=2)
+	return -EINVAL;
+
+    /*
+     * Only reason I need this spinlock is if two threads are trying to
+     * _start_ DMA at the same time. All other accesses to dma_status need not
+     * be interlocked.
+     */
+    DPRINTK("Checking for channel status\n");
+    spin_lock_irq(vice->dma_lock[r.channel]);
+    if(vice->dma_status[r.channel]!=VICE_RES_STATUS_FREE) {
+	spin_unlock_irq(vice->dma_lock[r.channel]);
+	return -EBUSY;
+    }
+    DPRINTK("Channel OK\n");
+    vice->dma_status[r.channel]=VICE_RES_STATUS_INPROGRESS;
+    spin_unlock_irq(vice->dma_lock[r.channel]);
+    DPRINTK("Kicking DMA off\n");
+    if(r.channel==0)
+        vice_write_reg(DMA_CH1_CTL,r.desc|VICE_DMA_CTL_GO|VICE_DMA_CTL_IE);
+    else
+	vice_write_reg(DMA_CH2_CTL,r.desc|VICE_DMA_CTL_GO|VICE_DMA_CTL_IE);
+    /*
+     * Sleep, untill this channel sends DMA_DONE or DMA_ERR interrupt...
+     *
+     * No spinlock is needed...
+     */
+    DPRINTK("Falling asleep\n");
+    while(vice->dma_status[r.channel]==VICE_RES_STATUS_INPROGRESS) {
+        interruptible_sleep_on(&wq);
+	DPRINTK("Huh? Where am I?\n");
+	if(signal_pending(current))break;
+    }
+    DPRINTK("*yawn* obviously waking up....\n");
+    r.status=vice->dma_status[r.channel];
+    vice->dma_status[r.channel]=VICE_RES_STATUS_FREE;
+    __copy_to_user(&r,run,sizeof(r));
+    DPRINTK("Done\n");
+    return 0;
+}
+
+void vice_dma_done(vice_dev *vice, int channel)
+{
+    DPRINTK("DMA done\n");
+
+    if(vice->dma_status[channel]!=VICE_RES_STATUS_INPROGRESS) {
+	DPRINTK("Ugh... DMA interrupt on channel %d, while DMA on that channel isn't initiated from CPU!\n",channel);
+	return;
+    }
+    vice->dma_status[channel]=VICE_RES_STATUS_DONE;
+    wake_up_interruptible(&wq);
+}
+
+void vice_dma_err(vice_dev *vice, int channel)
+{
+    DPRINTK("DMA error\n");
+    spin_lock_irq(vice->dma_lock[channel]);
+    vice->dma_status[channel]=VICE_RES_STATUS_ERR;
+    spin_unlock_irq(vice->dma_lock[channel]);
+    wake_up_interruptible(&wq);
+}
+
+/*
+ * Need to stop all DMA transfers
+ */
+
+void vice_dma_cleanup(vice_dev* vice)
+{
+}
+
+void vice_dma_reset(vice_dev* vice)
+{
+    /*
+     * Is DMA engine resettable?
+     * ... Yes, which register?
+     */
+    vice_write_reg(DMA_CH1_CTL,VICE_DMA_CTL_RESET);
+    vice_write_reg(DMA_CH2_CTL,VICE_DMA_CTL_RESET);
+    udelay(16); /* sleep for at least 16 VICE clocks */
+    vice_write_reg(DMA_CH1_CTL,VICE_DMA_CTL_IE|VICE_DMA_CTL_DESC1);
+    vice_write_reg(DMA_CH2_CTL,VICE_DMA_CTL_IE|VICE_DMA_CTL_DESC1);
+    vice_dma_clear_tlb(vice);
+}

[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2002-12-23 11:36 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2002-12-10 19:11 O2 VICE support ilya
2002-12-11 13:38 ` Christoph Hellwig
2002-12-11 22:16   ` ilya
2002-12-11 22:45     ` Christoph Hellwig
2002-12-11 22:46     ` Juan Quintela
2002-12-22  9:20 ` Geert Uytterhoeven

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