![David Howells](/assets/img/avatar_default.png)
Disintegrate asm/system.h for CRIS. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> cc: linux-cris-kernel@axis.com
288 lines
7.8 KiB
C
288 lines
7.8 KiB
C
/* Wrapper for DMA channel allocator that updates DMA client muxing.
|
|
* Copyright 2004-2007, Axis Communications AB
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
|
|
#include <asm/dma.h>
|
|
#include <arch/svinto.h>
|
|
#include <arch/system.h>
|
|
|
|
/* Macro to access ETRAX 100 registers */
|
|
#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
|
|
IO_STATE_(reg##_, field##_, _##val)
|
|
|
|
|
|
static char used_dma_channels[MAX_DMA_CHANNELS];
|
|
static const char * used_dma_channels_users[MAX_DMA_CHANNELS];
|
|
|
|
int cris_request_dma(unsigned int dmanr, const char * device_id,
|
|
unsigned options, enum dma_owner owner)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long int gens;
|
|
int fail = -EINVAL;
|
|
|
|
if (dmanr >= MAX_DMA_CHANNELS) {
|
|
printk(KERN_CRIT "cris_request_dma: invalid DMA channel %u\n", dmanr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
if (used_dma_channels[dmanr]) {
|
|
local_irq_restore(flags);
|
|
if (options & DMA_VERBOSE_ON_ERROR) {
|
|
printk(KERN_CRIT "Failed to request DMA %i for %s, already allocated by %s\n", dmanr, device_id, used_dma_channels_users[dmanr]);
|
|
}
|
|
if (options & DMA_PANIC_ON_ERROR) {
|
|
panic("request_dma error!");
|
|
}
|
|
return -EBUSY;
|
|
}
|
|
|
|
gens = genconfig_shadow;
|
|
|
|
switch(owner)
|
|
{
|
|
case dma_eth:
|
|
if ((dmanr != NETWORK_TX_DMA_NBR) &&
|
|
(dmanr != NETWORK_RX_DMA_NBR)) {
|
|
printk(KERN_CRIT "Invalid DMA channel for eth\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ser0:
|
|
if (dmanr == SER0_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma6, serial0);
|
|
} else if (dmanr == SER0_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma7, serial0);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ser0\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ser1:
|
|
if (dmanr == SER1_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma8, serial1);
|
|
} else if (dmanr == SER1_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma9, serial1);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ser1\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ser2:
|
|
if (dmanr == SER2_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma2, serial2);
|
|
} else if (dmanr == SER2_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma3, serial2);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ser2\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ser3:
|
|
if (dmanr == SER3_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma4, serial3);
|
|
} else if (dmanr == SER3_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma5, serial3);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ser3\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ata:
|
|
if (dmanr == ATA_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma2, ata);
|
|
} else if (dmanr == ATA_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma3, ata);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ata\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ext0:
|
|
if (dmanr == EXTDMA0_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma4, extdma0);
|
|
} else if (dmanr == EXTDMA0_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma5, extdma0);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ext0\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_ext1:
|
|
if (dmanr == EXTDMA1_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma6, extdma1);
|
|
} else if (dmanr == EXTDMA1_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma7, extdma1);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for ext1\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_int6:
|
|
if (dmanr == MEM2MEM_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma7, intdma6);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for int6\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_int7:
|
|
if (dmanr == MEM2MEM_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma6, intdma7);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for int7\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_usb:
|
|
if (dmanr == USB_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma8, usb);
|
|
} else if (dmanr == USB_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma9, usb);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for usb\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_scsi0:
|
|
if (dmanr == SCSI0_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma2, scsi0);
|
|
} else if (dmanr == SCSI0_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma3, scsi0);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for scsi0\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_scsi1:
|
|
if (dmanr == SCSI1_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma4, scsi1);
|
|
} else if (dmanr == SCSI1_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma5, scsi1);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for scsi1\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_par0:
|
|
if (dmanr == PAR0_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma2, par0);
|
|
} else if (dmanr == PAR0_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma3, par0);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for par0\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
case dma_par1:
|
|
if (dmanr == PAR1_TX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma4, par1);
|
|
} else if (dmanr == PAR1_RX_DMA_NBR) {
|
|
SETS(gens, R_GEN_CONFIG, dma5, par1);
|
|
} else {
|
|
printk(KERN_CRIT "Invalid DMA channel for par1\n");
|
|
goto bail;
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "Invalid DMA owner.\n");
|
|
goto bail;
|
|
}
|
|
|
|
used_dma_channels[dmanr] = 1;
|
|
used_dma_channels_users[dmanr] = device_id;
|
|
|
|
{
|
|
volatile int i;
|
|
genconfig_shadow = gens;
|
|
*R_GEN_CONFIG = genconfig_shadow;
|
|
/* Wait 12 cycles before doing any DMA command */
|
|
for(i = 6; i > 0; i--)
|
|
nop();
|
|
}
|
|
fail = 0;
|
|
bail:
|
|
local_irq_restore(flags);
|
|
return fail;
|
|
}
|
|
|
|
void cris_free_dma(unsigned int dmanr, const char * device_id)
|
|
{
|
|
unsigned long flags;
|
|
if (dmanr >= MAX_DMA_CHANNELS) {
|
|
printk(KERN_CRIT "cris_free_dma: invalid DMA channel %u\n", dmanr);
|
|
return;
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
if (!used_dma_channels[dmanr]) {
|
|
printk(KERN_CRIT "cris_free_dma: DMA channel %u not allocated\n", dmanr);
|
|
} else if (device_id != used_dma_channels_users[dmanr]) {
|
|
printk(KERN_CRIT "cris_free_dma: DMA channel %u not allocated by device\n", dmanr);
|
|
} else {
|
|
switch(dmanr)
|
|
{
|
|
case 0:
|
|
*R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH0_CMD, cmd, *R_DMA_CH0_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH0_CMD, cmd, reset));
|
|
break;
|
|
case 1:
|
|
*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH1_CMD, cmd, *R_DMA_CH1_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH1_CMD, cmd, reset));
|
|
break;
|
|
case 2:
|
|
*R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH2_CMD, cmd, *R_DMA_CH2_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH2_CMD, cmd, reset));
|
|
break;
|
|
case 3:
|
|
*R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH3_CMD, cmd, *R_DMA_CH3_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH3_CMD, cmd, reset));
|
|
break;
|
|
case 4:
|
|
*R_DMA_CH4_CMD = IO_STATE(R_DMA_CH4_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH4_CMD, cmd, *R_DMA_CH4_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH4_CMD, cmd, reset));
|
|
break;
|
|
case 5:
|
|
*R_DMA_CH5_CMD = IO_STATE(R_DMA_CH5_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH5_CMD, cmd, *R_DMA_CH5_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH5_CMD, cmd, reset));
|
|
break;
|
|
case 6:
|
|
*R_DMA_CH6_CMD = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *R_DMA_CH6_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
|
|
break;
|
|
case 7:
|
|
*R_DMA_CH7_CMD = IO_STATE(R_DMA_CH7_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH7_CMD, cmd, *R_DMA_CH7_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH7_CMD, cmd, reset));
|
|
break;
|
|
case 8:
|
|
*R_DMA_CH8_CMD = IO_STATE(R_DMA_CH8_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH8_CMD, cmd, *R_DMA_CH8_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH8_CMD, cmd, reset));
|
|
break;
|
|
case 9:
|
|
*R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, reset);
|
|
while (IO_EXTRACT(R_DMA_CH9_CMD, cmd, *R_DMA_CH9_CMD) ==
|
|
IO_STATE_VALUE(R_DMA_CH9_CMD, cmd, reset));
|
|
break;
|
|
}
|
|
used_dma_channels[dmanr] = 0;
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(cris_request_dma);
|
|
EXPORT_SYMBOL(cris_free_dma);
|