aboutsummaryrefslogtreecommitdiff
path: root/arch/arm26/machine/dma.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm26/machine/dma.c
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
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!
Diffstat (limited to 'arch/arm26/machine/dma.c')
-rw-r--r--arch/arm26/machine/dma.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm26/machine/dma.c b/arch/arm26/machine/dma.c
new file mode 100644
index 000000000000..cbc7c61d5b32
--- /dev/null
+++ b/arch/arm26/machine/dma.c
@@ -0,0 +1,215 @@
+/*
+ * linux/arch/arm26/kernel/dma.c
+ *
+ * Copyright (C) 1998-1999 Dave Gilbert / Russell King
+ * Copyright (C) 2003 Ian Molton
+ *
+ * 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.
+ *
+ * DMA functions specific to Archimedes and A5000 architecture
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <asm/dma.h>
+#include <asm/fiq.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+
+#define DPRINTK(x...) printk(KERN_DEBUG x)
+
+#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
+
+extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
+extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
+extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
+
+static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
+{
+ DPRINTK("arc_floppy_data_enable_dma\n");
+
+ if (dma->using_sg)
+ BUG();
+
+ switch (dma->dma_mode) {
+ case DMA_MODE_READ: { /* read */
+ unsigned long flags;
+ DPRINTK("enable_dma fdc1772 data read\n");
+ local_save_flags_cli(flags);
+ clf();
+
+ memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
+ &fdc1772_dma_read_end - &fdc1772_dma_read);
+ fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
+ enable_fiq(FIQ_FLOPPYDATA);
+ local_irq_restore(flags);
+ }
+ break;
+
+ case DMA_MODE_WRITE: { /* write */
+ unsigned long flags;
+ DPRINTK("enable_dma fdc1772 data write\n");
+ local_save_flags_cli(flags);
+ clf();
+ memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
+ &fdc1772_dma_write_end - &fdc1772_dma_write);
+ fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
+ enable_fiq(FIQ_FLOPPYDATA);
+
+ local_irq_restore(flags);
+ }
+ break;
+ default:
+ printk ("enable_dma: dma%d not initialised\n", channel);
+ }
+}
+
+static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+ extern unsigned int fdc1772_bytestogo;
+
+ /* 10/1/1999 DAG - I presume its the number of bytes left? */
+ return fdc1772_bytestogo;
+}
+
+static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
+{
+ /* Need to build a branch at the FIQ address */
+ extern void fdc1772_comendhandler(void);
+ unsigned long flags;
+
+ DPRINTK("arc_floppy_cmdend_enable_dma\n");
+ /*printk("enable_dma fdc1772 command end FIQ\n");*/
+ save_flags(flags);
+ clf();
+
+ /* B fdc1772_comendhandler */
+ *((unsigned int *)0x1c)=0xea000000 |
+ (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
+
+ local_irq_restore(flags);
+}
+
+static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+ /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
+ extern unsigned int fdc1772_fdc_int_done;
+
+ /* Explicit! If the int done is 0 then 1 int to go */
+ return (fdc1772_fdc_int_done==0)?1:0;
+}
+
+static void arc_disable_dma(dmach_t channel, dma_t *dma)
+{
+ disable_fiq(dma->dma_irq);
+}
+
+static struct dma_ops arc_floppy_data_dma_ops = {
+ .type = "FIQDMA",
+ .enable = arc_floppy_data_enable_dma,
+ .disable = arc_disable_dma,
+ .residue = arc_floppy_data_get_dma_residue,
+};
+
+static struct dma_ops arc_floppy_cmdend_dma_ops = {
+ .type = "FIQCMD",
+ .enable = arc_floppy_cmdend_enable_dma,
+ .disable = arc_disable_dma,
+ .residue = arc_floppy_cmdend_get_dma_residue,
+};
+#endif
+
+#ifdef CONFIG_ARCH_A5K
+static struct fiq_handler fh = {
+ .name = "floppydata"
+};
+
+static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+ struct pt_regs regs;
+ get_fiq_regs(&regs);
+ return regs.ARM_r9;
+}
+
+static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
+{
+ struct pt_regs regs;
+ void *fiqhandler_start;
+ unsigned int fiqhandler_length;
+ extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
+ unsigned long port);
+
+ if (dma->using_sg)
+ BUG();
+
+ if (dma->dma_mode == DMA_MODE_READ) {
+ extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
+ fiqhandler_start = &floppy_fiqin_start;
+ fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
+ } else {
+ extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
+ fiqhandler_start = &floppy_fiqout_start;
+ fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
+ }
+ if (claim_fiq(&fh)) {
+ printk("floppydma: couldn't claim FIQ.\n");
+ return;
+ }
+ memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
+ regs.ARM_r9 = dma->buf.length;
+ regs.ARM_r10 = (unsigned long)dma->buf.__address;
+ regs.ARM_fp = FLOPPYDMA_BASE;
+ set_fiq_regs(&regs);
+ enable_fiq(dma->dma_irq);
+}
+
+static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
+{
+ disable_fiq(dma->dma_irq);
+ release_fiq(&fh);
+}
+
+static struct dma_ops a5k_floppy_dma_ops = {
+ .type = "FIQDMA",
+ .enable = a5k_floppy_enable_dma,
+ .disable = a5k_floppy_disable_dma,
+ .residue = a5k_floppy_get_dma_residue,
+};
+#endif
+
+/*
+ * This is virtual DMA - we don't need anything here
+ */
+static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
+{
+}
+
+static struct dma_ops sound_dma_ops = {
+ .type = "VIRTUAL",
+ .enable = sound_enable_disable_dma,
+ .disable = sound_enable_disable_dma,
+};
+
+void __init arch_dma_init(dma_t *dma)
+{
+#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
+ if (machine_is_archimedes()) {
+ dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
+ dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops;
+ dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
+ dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops;
+ }
+#endif
+#ifdef CONFIG_ARCH_A5K
+ if (machine_is_a5k()) {
+ dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
+ dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops;
+ }
+#endif
+ dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
+}