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Diffstat (limited to 'arch/arm/mach-rpc/dma.c')
-rw-r--r--arch/arm/mach-rpc/dma.c213
1 files changed, 131 insertions, 82 deletions
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c
index 7958a30f8932..c47d974d52bd 100644
--- a/arch/arm/mach-rpc/dma.c
+++ b/arch/arm/mach-rpc/dma.c
@@ -26,6 +26,16 @@
#include <asm/mach/dma.h>
#include <asm/hardware/iomd.h>
+struct iomd_dma {
+ struct dma_struct dma;
+ unsigned int state;
+ unsigned long base; /* Controller base address */
+ int irq; /* Controller IRQ */
+ struct scatterlist cur_sg; /* Current controller buffer */
+ dma_addr_t dma_addr;
+ unsigned int dma_len;
+};
+
#if 0
typedef enum {
dma_size_8 = 1,
@@ -44,15 +54,15 @@ typedef enum {
#define CR (IOMD_IO0CR - IOMD_IO0CURA)
#define ST (IOMD_IO0ST - IOMD_IO0CURA)
-static void iomd_get_next_sg(struct scatterlist *sg, dma_t *dma)
+static void iomd_get_next_sg(struct scatterlist *sg, struct iomd_dma *idma)
{
unsigned long end, offset, flags = 0;
- if (dma->sg) {
- sg->dma_address = dma->sg->dma_address;
+ if (idma->dma.sg) {
+ sg->dma_address = idma->dma_addr;
offset = sg->dma_address & ~PAGE_MASK;
- end = offset + dma->sg->length;
+ end = offset + idma->dma_len;
if (end > PAGE_SIZE)
end = PAGE_SIZE;
@@ -62,15 +72,17 @@ static void iomd_get_next_sg(struct scatterlist *sg, dma_t *dma)
sg->length = end - TRANSFER_SIZE;
- dma->sg->length -= end - offset;
- dma->sg->dma_address += end - offset;
+ idma->dma_len -= end - offset;
+ idma->dma_addr += end - offset;
- if (dma->sg->length == 0) {
- if (dma->sgcount > 1) {
- dma->sg++;
- dma->sgcount--;
+ if (idma->dma_len == 0) {
+ if (idma->dma.sgcount > 1) {
+ idma->dma.sg = sg_next(idma->dma.sg);
+ idma->dma_addr = idma->dma.sg->dma_address;
+ idma->dma_len = idma->dma.sg->length;
+ idma->dma.sgcount--;
} else {
- dma->sg = NULL;
+ idma->dma.sg = NULL;
flags |= DMA_END_S;
}
}
@@ -85,8 +97,8 @@ static void iomd_get_next_sg(struct scatterlist *sg, dma_t *dma)
static irqreturn_t iomd_dma_handle(int irq, void *dev_id)
{
- dma_t *dma = (dma_t *)dev_id;
- unsigned long base = dma->dma_base;
+ struct iomd_dma *idma = dev_id;
+ unsigned long base = idma->base;
do {
unsigned int status;
@@ -95,93 +107,99 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id)
if (!(status & DMA_ST_INT))
return IRQ_HANDLED;
- if ((dma->state ^ status) & DMA_ST_AB)
- iomd_get_next_sg(&dma->cur_sg, dma);
+ if ((idma->state ^ status) & DMA_ST_AB)
+ iomd_get_next_sg(&idma->cur_sg, idma);
switch (status & (DMA_ST_OFL | DMA_ST_AB)) {
case DMA_ST_OFL: /* OIA */
case DMA_ST_AB: /* .IB */
- iomd_writel(dma->cur_sg.dma_address, base + CURA);
- iomd_writel(dma->cur_sg.length, base + ENDA);
- dma->state = DMA_ST_AB;
+ iomd_writel(idma->cur_sg.dma_address, base + CURA);
+ iomd_writel(idma->cur_sg.length, base + ENDA);
+ idma->state = DMA_ST_AB;
break;
case DMA_ST_OFL | DMA_ST_AB: /* OIB */
case 0: /* .IA */
- iomd_writel(dma->cur_sg.dma_address, base + CURB);
- iomd_writel(dma->cur_sg.length, base + ENDB);
- dma->state = 0;
+ iomd_writel(idma->cur_sg.dma_address, base + CURB);
+ iomd_writel(idma->cur_sg.length, base + ENDB);
+ idma->state = 0;
break;
}
if (status & DMA_ST_OFL &&
- dma->cur_sg.length == (DMA_END_S|DMA_END_L))
+ idma->cur_sg.length == (DMA_END_S|DMA_END_L))
break;
} while (1);
- dma->state = ~DMA_ST_AB;
+ idma->state = ~DMA_ST_AB;
disable_irq(irq);
return IRQ_HANDLED;
}
-static int iomd_request_dma(dmach_t channel, dma_t *dma)
+static int iomd_request_dma(unsigned int chan, dma_t *dma)
{
- return request_irq(dma->dma_irq, iomd_dma_handle,
- IRQF_DISABLED, dma->device_id, dma);
+ struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
+
+ return request_irq(idma->irq, iomd_dma_handle,
+ IRQF_DISABLED, idma->dma.device_id, idma);
}
-static void iomd_free_dma(dmach_t channel, dma_t *dma)
+static void iomd_free_dma(unsigned int chan, dma_t *dma)
{
- free_irq(dma->dma_irq, dma);
+ struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
+
+ free_irq(idma->irq, idma);
}
-static void iomd_enable_dma(dmach_t channel, dma_t *dma)
+static void iomd_enable_dma(unsigned int chan, dma_t *dma)
{
- unsigned long dma_base = dma->dma_base;
+ struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
+ unsigned long dma_base = idma->base;
unsigned int ctrl = TRANSFER_SIZE | DMA_CR_E;
- if (dma->invalid) {
- dma->invalid = 0;
+ if (idma->dma.invalid) {
+ idma->dma.invalid = 0;
/*
* Cope with ISA-style drivers which expect cache
* coherence.
*/
- if (!dma->sg) {
- dma->sg = &dma->buf;
- dma->sgcount = 1;
- dma->buf.length = dma->count;
- dma->buf.dma_address = dma_map_single(NULL,
- dma->addr, dma->count,
- dma->dma_mode == DMA_MODE_READ ?
+ if (!idma->dma.sg) {
+ idma->dma.sg = &idma->dma.buf;
+ idma->dma.sgcount = 1;
+ idma->dma.buf.length = idma->dma.count;
+ idma->dma.buf.dma_address = dma_map_single(NULL,
+ idma->dma.addr, idma->dma.count,
+ idma->dma.dma_mode == DMA_MODE_READ ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);
}
iomd_writeb(DMA_CR_C, dma_base + CR);
- dma->state = DMA_ST_AB;
+ idma->state = DMA_ST_AB;
}
-
- if (dma->dma_mode == DMA_MODE_READ)
+
+ if (idma->dma.dma_mode == DMA_MODE_READ)
ctrl |= DMA_CR_D;
iomd_writeb(ctrl, dma_base + CR);
- enable_irq(dma->dma_irq);
+ enable_irq(idma->irq);
}
-static void iomd_disable_dma(dmach_t channel, dma_t *dma)
+static void iomd_disable_dma(unsigned int chan, dma_t *dma)
{
- unsigned long dma_base = dma->dma_base;
+ struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
+ unsigned long dma_base = idma->base;
unsigned long flags;
local_irq_save(flags);
- if (dma->state != ~DMA_ST_AB)
- disable_irq(dma->dma_irq);
+ if (idma->state != ~DMA_ST_AB)
+ disable_irq(idma->irq);
iomd_writeb(0, dma_base + CR);
local_irq_restore(flags);
}
-static int iomd_set_dma_speed(dmach_t channel, dma_t *dma, int cycle)
+static int iomd_set_dma_speed(unsigned int chan, dma_t *dma, int cycle)
{
int tcr, speed;
@@ -197,7 +215,7 @@ static int iomd_set_dma_speed(dmach_t channel, dma_t *dma, int cycle)
tcr = iomd_readb(IOMD_DMATCR);
speed &= 3;
- switch (channel) {
+ switch (chan) {
case DMA_0:
tcr = (tcr & ~0x03) | speed;
break;
@@ -236,16 +254,22 @@ static struct fiq_handler fh = {
.name = "floppydma"
};
-static void floppy_enable_dma(dmach_t channel, dma_t *dma)
+struct floppy_dma {
+ struct dma_struct dma;
+ unsigned int fiq;
+};
+
+static void floppy_enable_dma(unsigned int chan, dma_t *dma)
{
+ struct floppy_dma *fdma = container_of(dma, struct floppy_dma, dma);
void *fiqhandler_start;
unsigned int fiqhandler_length;
struct pt_regs regs;
- if (dma->sg)
+ if (fdma->dma.sg)
BUG();
- if (dma->dma_mode == DMA_MODE_READ) {
+ if (fdma->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;
@@ -255,8 +279,8 @@ static void floppy_enable_dma(dmach_t channel, dma_t *dma)
fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
}
- regs.ARM_r9 = dma->count;
- regs.ARM_r10 = (unsigned long)dma->addr;
+ regs.ARM_r9 = fdma->dma.count;
+ regs.ARM_r10 = (unsigned long)fdma->dma.addr;
regs.ARM_fp = (unsigned long)FLOPPYDMA_BASE;
if (claim_fiq(&fh)) {
@@ -266,16 +290,17 @@ static void floppy_enable_dma(dmach_t channel, dma_t *dma)
set_fiq_handler(fiqhandler_start, fiqhandler_length);
set_fiq_regs(&regs);
- enable_fiq(dma->dma_irq);
+ enable_fiq(fdma->fiq);
}
-static void floppy_disable_dma(dmach_t channel, dma_t *dma)
+static void floppy_disable_dma(unsigned int chan, dma_t *dma)
{
- disable_fiq(dma->dma_irq);
+ struct floppy_dma *fdma = container_of(dma, struct floppy_dma, dma);
+ disable_fiq(fdma->fiq);
release_fiq(&fh);
}
-static int floppy_get_residue(dmach_t channel, dma_t *dma)
+static int floppy_get_residue(unsigned int chan, dma_t *dma)
{
struct pt_regs regs;
get_fiq_regs(&regs);
@@ -292,7 +317,7 @@ static struct dma_ops floppy_dma_ops = {
/*
* This is virtual DMA - we don't need anything here.
*/
-static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
+static void sound_enable_disable_dma(unsigned int chan, dma_t *dma)
{
}
@@ -302,8 +327,24 @@ static struct dma_ops sound_dma_ops = {
.disable = sound_enable_disable_dma,
};
-void __init arch_dma_init(dma_t *dma)
+static struct iomd_dma iomd_dma[6];
+
+static struct floppy_dma floppy_dma = {
+ .dma = {
+ .d_ops = &floppy_dma_ops,
+ },
+ .fiq = FIQ_FLOPPYDATA,
+};
+
+static dma_t sound_dma = {
+ .d_ops = &sound_dma_ops,
+};
+
+static int __init rpc_dma_init(void)
{
+ unsigned int i;
+ int ret;
+
iomd_writeb(0, IOMD_IO0CR);
iomd_writeb(0, IOMD_IO1CR);
iomd_writeb(0, IOMD_IO2CR);
@@ -311,31 +352,39 @@ void __init arch_dma_init(dma_t *dma)
iomd_writeb(0xa0, IOMD_DMATCR);
- dma[DMA_0].dma_base = IOMD_IO0CURA;
- dma[DMA_0].dma_irq = IRQ_DMA0;
- dma[DMA_0].d_ops = &iomd_dma_ops;
- dma[DMA_1].dma_base = IOMD_IO1CURA;
- dma[DMA_1].dma_irq = IRQ_DMA1;
- dma[DMA_1].d_ops = &iomd_dma_ops;
- dma[DMA_2].dma_base = IOMD_IO2CURA;
- dma[DMA_2].dma_irq = IRQ_DMA2;
- dma[DMA_2].d_ops = &iomd_dma_ops;
- dma[DMA_3].dma_base = IOMD_IO3CURA;
- dma[DMA_3].dma_irq = IRQ_DMA3;
- dma[DMA_3].d_ops = &iomd_dma_ops;
- dma[DMA_S0].dma_base = IOMD_SD0CURA;
- dma[DMA_S0].dma_irq = IRQ_DMAS0;
- dma[DMA_S0].d_ops = &iomd_dma_ops;
- dma[DMA_S1].dma_base = IOMD_SD1CURA;
- dma[DMA_S1].dma_irq = IRQ_DMAS1;
- dma[DMA_S1].d_ops = &iomd_dma_ops;
- dma[DMA_VIRTUAL_FLOPPY].dma_irq = FIQ_FLOPPYDATA;
- dma[DMA_VIRTUAL_FLOPPY].d_ops = &floppy_dma_ops;
- dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
-
/*
* Setup DMA channels 2,3 to be for podules
* and channels 0,1 for internal devices
*/
iomd_writeb(DMA_EXT_IO3|DMA_EXT_IO2, IOMD_DMAEXT);
+
+ iomd_dma[DMA_0].base = IOMD_IO0CURA;
+ iomd_dma[DMA_0].irq = IRQ_DMA0;
+ iomd_dma[DMA_1].base = IOMD_IO1CURA;
+ iomd_dma[DMA_1].irq = IRQ_DMA1;
+ iomd_dma[DMA_2].base = IOMD_IO2CURA;
+ iomd_dma[DMA_2].irq = IRQ_DMA2;
+ iomd_dma[DMA_3].base = IOMD_IO3CURA;
+ iomd_dma[DMA_3].irq = IRQ_DMA3;
+ iomd_dma[DMA_S0].base = IOMD_SD0CURA;
+ iomd_dma[DMA_S0].irq = IRQ_DMAS0;
+ iomd_dma[DMA_S1].base = IOMD_SD1CURA;
+ iomd_dma[DMA_S1].irq = IRQ_DMAS1;
+
+ for (i = DMA_0; i <= DMA_S1; i++) {
+ iomd_dma[i].dma.d_ops = &iomd_dma_ops;
+
+ ret = isa_dma_add(i, &iomd_dma[i].dma);
+ if (ret)
+ printk("IOMDDMA%u: unable to register: %d\n", i, ret);
+ }
+
+ ret = isa_dma_add(DMA_VIRTUAL_FLOPPY, &floppy_dma.dma);
+ if (ret)
+ printk("IOMDFLOPPY: unable to register: %d\n", ret);
+ ret = isa_dma_add(DMA_VIRTUAL_SOUND, &sound_dma);
+ if (ret)
+ printk("IOMDSOUND: unable to register: %d\n", ret);
+ return 0;
}
+core_initcall(rpc_dma_init);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.