Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 377 insertions, 0 deletions

diff --git a/include/asm-alpha/dma.h b/include/asm-alpha/dma.h
new file mode 100644
index 000000000000..683afaa3deed
--- /dev/null
+++ b/include/asm-alpha/dma.h
@@ -0,0 +1,377 @@
+/*
+ * include/asm-alpha/dma.h
+ *
+ * This is essentially the same as the i386 DMA stuff, as the AlphaPCs
+ * use ISA-compatible dma.  The only extension is support for high-page
+ * registers that allow to set the top 8 bits of a 32-bit DMA address.
+ * This register should be written last when setting up a DMA address
+ * as this will also enable DMA across 64 KB boundaries.
+ */
+
+/* $Id: dma.h,v 1.7 1992/12/14 00:29:34 root Exp root $
+ * linux/include/asm/dma.h: Defines for using and allocating dma channels.
+ * Written by Hennus Bergman, 1992.
+ * High DMA channel support & info by Hannu Savolainen
+ * and John Boyd, Nov. 1992.
+ */
+
+#ifndef _ASM_DMA_H
+#define _ASM_DMA_H
+
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <asm/io.h>
+
+#define dma_outb        outb
+#define dma_inb         inb
+
+/*
+ * NOTES about DMA transfers:
+ *
+ *  controller 1: channels 0-3, byte operations, ports 00-1F
+ *  controller 2: channels 4-7, word operations, ports C0-DF
+ *
+ *  - ALL registers are 8 bits only, regardless of transfer size
+ *  - channel 4 is not used - cascades 1 into 2.
+ *  - channels 0-3 are byte - addresses/counts are for physical bytes
+ *  - channels 5-7 are word - addresses/counts are for physical words
+ *  - transfers must not cross physical 64K (0-3) or 128K (5-7) boundaries
+ *  - transfer count loaded to registers is 1 less than actual count
+ *  - controller 2 offsets are all even (2x offsets for controller 1)
+ *  - page registers for 5-7 don't use data bit 0, represent 128K pages
+ *  - page registers for 0-3 use bit 0, represent 64K pages
+ *
+ * DMA transfers are limited to the lower 16MB of _physical_ memory.  
+ * Note that addresses loaded into registers must be _physical_ addresses,
+ * not logical addresses (which may differ if paging is active).
+ *
+ *  Address mapping for channels 0-3:
+ *
+ *   A23 ... A16 A15 ... A8  A7 ... A0    (Physical addresses)
+ *    |  ...  |   |  ... |   |  ... |
+ *    |  ...  |   |  ... |   |  ... |
+ *    |  ...  |   |  ... |   |  ... |
+ *   P7  ...  P0  A7 ... A0  A7 ... A0   
+ * |    Page    | Addr MSB | Addr LSB |   (DMA registers)
+ *
+ *  Address mapping for channels 5-7:
+ *
+ *   A23 ... A17 A16 A15 ... A9 A8 A7 ... A1 A0    (Physical addresses)
+ *    |  ...  |   \   \   ... \  \  \  ... \  \
+ *    |  ...  |    \   \   ... \  \  \  ... \  (not used)
+ *    |  ...  |     \   \   ... \  \  \  ... \
+ *   P7  ...  P1 (0) A7 A6  ... A0 A7 A6 ... A0   
+ * |      Page      |  Addr MSB   |  Addr LSB  |   (DMA registers)
+ *
+ * Again, channels 5-7 transfer _physical_ words (16 bits), so addresses
+ * and counts _must_ be word-aligned (the lowest address bit is _ignored_ at
+ * the hardware level, so odd-byte transfers aren't possible).
+ *
+ * Transfer count (_not # bytes_) is limited to 64K, represented as actual
+ * count - 1 : 64K => 0xFFFF, 1 => 0x0000.  Thus, count is always 1 or more,
+ * and up to 128K bytes may be transferred on channels 5-7 in one operation. 
+ *
+ */
+
+#define MAX_DMA_CHANNELS        8
+
+/*
+  ISA DMA limitations on Alpha platforms,
+
+  These may be due to SIO (PCI<->ISA bridge) chipset limitation, or
+  just a wiring limit.
+*/
+
+/* The maximum address for ISA DMA transfer on Alpha XL, due to an
+   hardware SIO limitation, is 64MB.
+*/
+#define ALPHA_XL_MAX_ISA_DMA_ADDRESS            0x04000000UL
+
+/* The maximum address for ISA DMA transfer on RUFFIAN,
+   due to an hardware SIO limitation, is 16MB.
+*/
+#define ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS       0x01000000UL
+
+/* The maximum address for ISA DMA transfer on SABLE, and some ALCORs,
+   due to an hardware SIO chip limitation, is 2GB.
+*/
+#define ALPHA_SABLE_MAX_ISA_DMA_ADDRESS         0x80000000UL
+#define ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS         0x80000000UL
+
+/*
+  Maximum address for all the others is the complete 32-bit bus
+  address space.
+*/
+#define ALPHA_MAX_ISA_DMA_ADDRESS               0x100000000UL
+
+#ifdef CONFIG_ALPHA_GENERIC
+# define MAX_ISA_DMA_ADDRESS            (alpha_mv.max_isa_dma_address)
+#else
+# if defined(CONFIG_ALPHA_XL)
+#  define MAX_ISA_DMA_ADDRESS           ALPHA_XL_MAX_ISA_DMA_ADDRESS
+# elif defined(CONFIG_ALPHA_RUFFIAN)
+#  define MAX_ISA_DMA_ADDRESS           ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS
+# elif defined(CONFIG_ALPHA_SABLE)
+#  define MAX_ISA_DMA_ADDRESS           ALPHA_SABLE_MAX_ISA_DMA_ADDRESS
+# elif defined(CONFIG_ALPHA_ALCOR)
+#  define MAX_ISA_DMA_ADDRESS           ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS
+# else
+#  define MAX_ISA_DMA_ADDRESS           ALPHA_MAX_ISA_DMA_ADDRESS
+# endif
+#endif
+
+/* If we have the iommu, we don't have any address limitations on DMA.
+   Otherwise (Nautilus, RX164), we have to have 0-16 Mb DMA zone
+   like i386. */
+#define MAX_DMA_ADDRESS         (alpha_mv.mv_pci_tbi ?  \
+                                 ~0UL : IDENT_ADDR + 0x01000000)
+
+/* 8237 DMA controllers */
+#define IO_DMA1_BASE    0x00    /* 8 bit slave DMA, channels 0..3 */
+#define IO_DMA2_BASE    0xC0    /* 16 bit master DMA, ch 4(=slave input)..7 */
+
+/* DMA controller registers */
+#define DMA1_CMD_REG            0x08    /* command register (w) */
+#define DMA1_STAT_REG           0x08    /* status register (r) */
+#define DMA1_REQ_REG            0x09    /* request register (w) */
+#define DMA1_MASK_REG           0x0A    /* single-channel mask (w) */
+#define DMA1_MODE_REG           0x0B    /* mode register (w) */
+#define DMA1_CLEAR_FF_REG       0x0C    /* clear pointer flip-flop (w) */
+#define DMA1_TEMP_REG           0x0D    /* Temporary Register (r) */
+#define DMA1_RESET_REG          0x0D    /* Master Clear (w) */
+#define DMA1_CLR_MASK_REG       0x0E    /* Clear Mask */
+#define DMA1_MASK_ALL_REG       0x0F    /* all-channels mask (w) */
+#define DMA1_EXT_MODE_REG       (0x400 | DMA1_MODE_REG)
+
+#define DMA2_CMD_REG            0xD0    /* command register (w) */
+#define DMA2_STAT_REG           0xD0    /* status register (r) */
+#define DMA2_REQ_REG            0xD2    /* request register (w) */
+#define DMA2_MASK_REG           0xD4    /* single-channel mask (w) */
+#define DMA2_MODE_REG           0xD6    /* mode register (w) */
+#define DMA2_CLEAR_FF_REG       0xD8    /* clear pointer flip-flop (w) */
+#define DMA2_TEMP_REG           0xDA    /* Temporary Register (r) */
+#define DMA2_RESET_REG          0xDA    /* Master Clear (w) */
+#define DMA2_CLR_MASK_REG       0xDC    /* Clear Mask */
+#define DMA2_MASK_ALL_REG       0xDE    /* all-channels mask (w) */
+#define DMA2_EXT_MODE_REG       (0x400 | DMA2_MODE_REG)
+
+#define DMA_ADDR_0              0x00    /* DMA address registers */
+#define DMA_ADDR_1              0x02
+#define DMA_ADDR_2              0x04
+#define DMA_ADDR_3              0x06
+#define DMA_ADDR_4              0xC0
+#define DMA_ADDR_5              0xC4
+#define DMA_ADDR_6              0xC8
+#define DMA_ADDR_7              0xCC
+
+#define DMA_CNT_0               0x01    /* DMA count registers */
+#define DMA_CNT_1               0x03
+#define DMA_CNT_2               0x05
+#define DMA_CNT_3               0x07
+#define DMA_CNT_4               0xC2
+#define DMA_CNT_5               0xC6
+#define DMA_CNT_6               0xCA
+#define DMA_CNT_7               0xCE
+
+#define DMA_PAGE_0              0x87    /* DMA page registers */
+#define DMA_PAGE_1              0x83
+#define DMA_PAGE_2              0x81
+#define DMA_PAGE_3              0x82
+#define DMA_PAGE_5              0x8B
+#define DMA_PAGE_6              0x89
+#define DMA_PAGE_7              0x8A
+
+#define DMA_HIPAGE_0            (0x400 | DMA_PAGE_0)
+#define DMA_HIPAGE_1            (0x400 | DMA_PAGE_1)
+#define DMA_HIPAGE_2            (0x400 | DMA_PAGE_2)
+#define DMA_HIPAGE_3            (0x400 | DMA_PAGE_3)
+#define DMA_HIPAGE_4            (0x400 | DMA_PAGE_4)
+#define DMA_HIPAGE_5            (0x400 | DMA_PAGE_5)
+#define DMA_HIPAGE_6            (0x400 | DMA_PAGE_6)
+#define DMA_HIPAGE_7            (0x400 | DMA_PAGE_7)
+
+#define DMA_MODE_READ   0x44    /* I/O to memory, no autoinit, increment, single mode */
+#define DMA_MODE_WRITE  0x48    /* memory to I/O, no autoinit, increment, single mode */
+#define DMA_MODE_CASCADE 0xC0   /* pass thru DREQ->HRQ, DACK<-HLDA only */
+
+#define DMA_AUTOINIT    0x10
+
+extern spinlock_t  dma_spin_lock;
+
+static __inline__ unsigned long claim_dma_lock(void)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&dma_spin_lock, flags);
+        return flags;
+}
+
+static __inline__ void release_dma_lock(unsigned long flags)
+{
+        spin_unlock_irqrestore(&dma_spin_lock, flags);
+}
+
+/* enable/disable a specific DMA channel */
+static __inline__ void enable_dma(unsigned int dmanr)
+{
+        if (dmanr<=3)
+                dma_outb(dmanr,  DMA1_MASK_REG);
+        else
+                dma_outb(dmanr & 3,  DMA2_MASK_REG);
+}
+
+static __inline__ void disable_dma(unsigned int dmanr)
+{
+        if (dmanr<=3)
+                dma_outb(dmanr | 4,  DMA1_MASK_REG);
+        else
+                dma_outb((dmanr & 3) | 4,  DMA2_MASK_REG);
+}
+
+/* Clear the 'DMA Pointer Flip Flop'.
+ * Write 0 for LSB/MSB, 1 for MSB/LSB access.
+ * Use this once to initialize the FF to a known state.
+ * After that, keep track of it. :-)
+ * --- In order to do that, the DMA routines below should ---
+ * --- only be used while interrupts are disabled! ---
+ */
+static __inline__ void clear_dma_ff(unsigned int dmanr)
+{
+        if (dmanr<=3)
+                dma_outb(0,  DMA1_CLEAR_FF_REG);
+        else
+                dma_outb(0,  DMA2_CLEAR_FF_REG);
+}
+
+/* set mode (above) for a specific DMA channel */
+static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
+{
+        if (dmanr<=3)
+                dma_outb(mode | dmanr,  DMA1_MODE_REG);
+        else
+                dma_outb(mode | (dmanr&3),  DMA2_MODE_REG);
+}
+
+/* set extended mode for a specific DMA channel */
+static __inline__ void set_dma_ext_mode(unsigned int dmanr, char ext_mode)
+{
+        if (dmanr<=3)
+                dma_outb(ext_mode | dmanr,  DMA1_EXT_MODE_REG);
+        else
+                dma_outb(ext_mode | (dmanr&3),  DMA2_EXT_MODE_REG);
+}
+
+/* Set only the page register bits of the transfer address.
+ * This is used for successive transfers when we know the contents of
+ * the lower 16 bits of the DMA current address register.
+ */
+static __inline__ void set_dma_page(unsigned int dmanr, unsigned int pagenr)
+{
+        switch(dmanr) {
+                case 0:
+                        dma_outb(pagenr, DMA_PAGE_0);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_0);
+                        break;
+                case 1:
+                        dma_outb(pagenr, DMA_PAGE_1);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_1);
+                        break;
+                case 2:
+                        dma_outb(pagenr, DMA_PAGE_2);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_2);
+                        break;
+                case 3:
+                        dma_outb(pagenr, DMA_PAGE_3);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_3);
+                        break;
+                case 5:
+                        dma_outb(pagenr & 0xfe, DMA_PAGE_5);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_5);
+                        break;
+                case 6:
+                        dma_outb(pagenr & 0xfe, DMA_PAGE_6);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_6);
+                        break;
+                case 7:
+                        dma_outb(pagenr & 0xfe, DMA_PAGE_7);
+                        dma_outb((pagenr >> 8), DMA_HIPAGE_7);
+                        break;
+        }
+}
+
+
+/* Set transfer address & page bits for specific DMA channel.
+ * Assumes dma flipflop is clear.
+ */
+static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int a)
+{
+        if (dmanr <= 3)  {
+            dma_outb( a & 0xff, ((dmanr&3)<<1) + IO_DMA1_BASE );
+            dma_outb( (a>>8) & 0xff, ((dmanr&3)<<1) + IO_DMA1_BASE );
+        }  else  {
+            dma_outb( (a>>1) & 0xff, ((dmanr&3)<<2) + IO_DMA2_BASE );
+            dma_outb( (a>>9) & 0xff, ((dmanr&3)<<2) + IO_DMA2_BASE );
+        }
+        set_dma_page(dmanr, a>>16);     /* set hipage last to enable 32-bit mode */
+}
+
+
+/* Set transfer size (max 64k for DMA1..3, 128k for DMA5..7) for
+ * a specific DMA channel.
+ * You must ensure the parameters are valid.
+ * NOTE: from a manual: "the number of transfers is one more
+ * than the initial word count"! This is taken into account.
+ * Assumes dma flip-flop is clear.
+ * NOTE 2: "count" represents _bytes_ and must be even for channels 5-7.
+ */
+static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
+{
+        count--;
+        if (dmanr <= 3)  {
+            dma_outb( count & 0xff, ((dmanr&3)<<1) + 1 + IO_DMA1_BASE );
+            dma_outb( (count>>8) & 0xff, ((dmanr&3)<<1) + 1 + IO_DMA1_BASE );
+        } else {
+            dma_outb( (count>>1) & 0xff, ((dmanr&3)<<2) + 2 + IO_DMA2_BASE );
+            dma_outb( (count>>9) & 0xff, ((dmanr&3)<<2) + 2 + IO_DMA2_BASE );
+        }
+}
+
+
+/* Get DMA residue count. After a DMA transfer, this
+ * should return zero. Reading this while a DMA transfer is
+ * still in progress will return unpredictable results.
+ * If called before the channel has been used, it may return 1.
+ * Otherwise, it returns the number of _bytes_ left to transfer.
+ *
+ * Assumes DMA flip-flop is clear.
+ */
+static __inline__ int get_dma_residue(unsigned int dmanr)
+{
+        unsigned int io_port = (dmanr<=3)? ((dmanr&3)<<1) + 1 + IO_DMA1_BASE
+                                         : ((dmanr&3)<<2) + 2 + IO_DMA2_BASE;
+
+        /* using short to get 16-bit wrap around */
+        unsigned short count;
+
+        count = 1 + dma_inb(io_port);
+        count += dma_inb(io_port) << 8;
+        
+        return (dmanr<=3)? count : (count<<1);
+}
+
+
+/* These are in kernel/dma.c: */
+extern int request_dma(unsigned int dmanr, const char * device_id);     /* reserve a DMA channel */
+extern void free_dma(unsigned int dmanr);       /* release it again */
+#define KERNEL_HAVE_CHECK_DMA
+extern int check_dma(unsigned int dmanr);
+
+/* From PCI */
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy    (0)
+#endif
+
+
+#endif /* _ASM_DMA_H */