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Diffstat (limited to 'arch/arm/mach-davinci/dma.c')
-rw-r--r--arch/arm/mach-davinci/dma.c172
1 files changed, 108 insertions, 64 deletions
diff --git a/arch/arm/mach-davinci/dma.c b/arch/arm/mach-davinci/dma.c
index f2e57d272958..15dd886df04c 100644
--- a/arch/arm/mach-davinci/dma.c
+++ b/arch/arm/mach-davinci/dma.c
@@ -18,22 +18,13 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
-#include <linux/sched.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/compiler.h>
#include <linux/io.h>
-#include <mach/cputype.h>
-#include <mach/memory.h>
-#include <mach/hardware.h>
-#include <mach/irqs.h>
#include <mach/edma.h>
-#include <mach/mux.h>
-
/* Offsets matching "struct edmacc_param" */
#define PARM_OPT 0x00
@@ -235,11 +226,11 @@ struct edma {
*/
DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
- /* The edma_noevent bit for each channel is clear unless
- * it doesn't trigger DMA events on this platform. It uses a
- * bit of SOC-specific initialization code.
+ /* The edma_unused bit for each channel is clear unless
+ * it is not being used on this platform. It uses a bit
+ * of SOC-specific initialization code.
*/
- DECLARE_BITMAP(edma_noevent, EDMA_MAX_DMACH);
+ DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
unsigned irq_res_start;
unsigned irq_res_end;
@@ -252,6 +243,7 @@ struct edma {
};
static struct edma *edma_info[EDMA_MAX_CC];
+static int arch_num_cc;
/* dummy param set used to (re)initialize parameter RAM slots */
static const struct edmacc_param dummy_paramset = {
@@ -509,47 +501,82 @@ static irqreturn_t dma_tc1err_handler(int irq, void *data)
return IRQ_HANDLED;
}
-static int reserve_contiguous_params(int ctlr, unsigned int id,
- unsigned int num_params,
- unsigned int start_param)
+static int reserve_contiguous_slots(int ctlr, unsigned int id,
+ unsigned int num_slots,
+ unsigned int start_slot)
{
int i, j;
- unsigned int count = num_params;
+ unsigned int count = num_slots;
+ int stop_slot = start_slot;
+ DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
- for (i = start_param; i < edma_info[ctlr]->num_slots; ++i) {
+ for (i = start_slot; i < edma_info[ctlr]->num_slots; ++i) {
j = EDMA_CHAN_SLOT(i);
- if (!test_and_set_bit(j, edma_info[ctlr]->edma_inuse))
+ if (!test_and_set_bit(j, edma_info[ctlr]->edma_inuse)) {
+ /* Record our current beginning slot */
+ if (count == num_slots)
+ stop_slot = i;
+
count--;
+ set_bit(j, tmp_inuse);
+
if (count == 0)
break;
- else if (id == EDMA_CONT_PARAMS_FIXED_EXACT)
- break;
- else
- count = num_params;
+ } else {
+ clear_bit(j, tmp_inuse);
+
+ if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
+ stop_slot = i;
+ break;
+ } else
+ count = num_slots;
+ }
}
/*
* We have to clear any bits that we set
- * if we run out parameter RAMs, i.e we do find a set
- * of contiguous parameter RAMs but do not find the exact number
- * requested as we may reach the total number of parameter RAMs
+ * if we run out parameter RAM slots, i.e we do find a set
+ * of contiguous parameter RAM slots but do not find the exact number
+ * requested as we may reach the total number of parameter RAM slots
*/
- if (count) {
- for (j = i - num_params + count + 1; j <= i ; ++j)
+ if (i == edma_info[ctlr]->num_slots)
+ stop_slot = i;
+
+ for (j = start_slot; j < stop_slot; j++)
+ if (test_bit(j, tmp_inuse))
clear_bit(j, edma_info[ctlr]->edma_inuse);
+ if (count)
return -EBUSY;
- }
- for (j = i - num_params + 1; j <= i; ++j)
+ for (j = i - num_slots + 1; j <= i; ++j)
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
&dummy_paramset, PARM_SIZE);
- return EDMA_CTLR_CHAN(ctlr, i - num_params + 1);
+ return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
+}
+
+static int prepare_unused_channel_list(struct device *dev, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ int i, ctlr;
+
+ for (i = 0; i < pdev->num_resources; i++) {
+ if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
+ (int)pdev->resource[i].start >= 0) {
+ ctlr = EDMA_CTLR(pdev->resource[i].start);
+ clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
+ edma_info[ctlr]->edma_unused);
+ }
+ }
+
+ return 0;
}
/*-----------------------------------------------------------------------*/
+static bool unused_chan_list_done;
+
/* Resource alloc/free: dma channels, parameter RAM slots */
/**
@@ -587,7 +614,22 @@ int edma_alloc_channel(int channel,
void *data,
enum dma_event_q eventq_no)
{
- unsigned i, done, ctlr = 0;
+ unsigned i, done = 0, ctlr = 0;
+ int ret = 0;
+
+ if (!unused_chan_list_done) {
+ /*
+ * Scan all the platform devices to find out the EDMA channels
+ * used and clear them in the unused list, making the rest
+ * available for ARM usage.
+ */
+ ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
+ prepare_unused_channel_list);
+ if (ret < 0)
+ return ret;
+
+ unused_chan_list_done = true;
+ }
if (channel >= 0) {
ctlr = EDMA_CTLR(channel);
@@ -595,15 +637,15 @@ int edma_alloc_channel(int channel,
}
if (channel < 0) {
- for (i = 0; i < EDMA_MAX_CC; i++) {
+ for (i = 0; i < arch_num_cc; i++) {
channel = 0;
for (;;) {
channel = find_next_bit(edma_info[i]->
- edma_noevent,
+ edma_unused,
edma_info[i]->num_channels,
channel);
if (channel == edma_info[i]->num_channels)
- return -ENOMEM;
+ break;
if (!test_and_set_bit(channel,
edma_info[i]->edma_inuse)) {
done = 1;
@@ -615,6 +657,8 @@ int edma_alloc_channel(int channel,
if (done)
break;
}
+ if (!done)
+ return -ENOMEM;
} else if (channel >= edma_info[ctlr]->num_channels) {
return -EINVAL;
} else if (test_and_set_bit(channel, edma_info[ctlr]->edma_inuse)) {
@@ -635,7 +679,7 @@ int edma_alloc_channel(int channel,
map_dmach_queue(ctlr, channel, eventq_no);
- return channel;
+ return EDMA_CTLR_CHAN(ctlr, channel);
}
EXPORT_SYMBOL(edma_alloc_channel);
@@ -743,26 +787,27 @@ EXPORT_SYMBOL(edma_free_slot);
/**
* edma_alloc_cont_slots- alloc contiguous parameter RAM slots
* The API will return the starting point of a set of
- * contiguous PARAM's that have been requested
+ * contiguous parameter RAM slots that have been requested
*
* @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
* or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
- * @count: number of contiguous Paramter RAM's
- * @param - the start value of Parameter RAM that should be passed if id
+ * @count: number of contiguous Paramter RAM slots
+ * @slot - the start value of Parameter RAM slot that should be passed if id
* is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
*
* If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
- * contiguous Parameter RAMs from parameter RAM 64 in the case of DaVinci SOCs
- * and 32 in the case of Primus
+ * contiguous Parameter RAM slots from parameter RAM 64 in the case of
+ * DaVinci SOCs and 32 in the case of DA8xx SOCs.
*
* If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
- * set of contiguous parameter RAMs from the "param" that is passed as an
+ * set of contiguous parameter RAM slots from the "slot" that is passed as an
* argument to the API.
*
* If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
- * starts looking for a set of contiguous parameter RAMs from the "param"
+ * starts looking for a set of contiguous parameter RAMs from the "slot"
* that is passed as an argument to the API. On failure the API will try to
- * find a set of contiguous Parameter RAMs in the remaining Parameter RAMs
+ * find a set of contiguous Parameter RAM slots from the remaining Parameter
+ * RAM slots
*/
int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
{
@@ -771,12 +816,13 @@ int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
* the number of channels and lesser than the total number
* of slots
*/
- if (slot < edma_info[ctlr]->num_channels ||
- slot >= edma_info[ctlr]->num_slots)
+ if ((id != EDMA_CONT_PARAMS_ANY) &&
+ (slot < edma_info[ctlr]->num_channels ||
+ slot >= edma_info[ctlr]->num_slots))
return -EINVAL;
/*
- * The number of parameter RAMs requested cannot be less than 1
+ * The number of parameter RAM slots requested cannot be less than 1
* and cannot be more than the number of slots minus the number of
* channels
*/
@@ -786,11 +832,11 @@ int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
switch (id) {
case EDMA_CONT_PARAMS_ANY:
- return reserve_contiguous_params(ctlr, id, count,
+ return reserve_contiguous_slots(ctlr, id, count,
edma_info[ctlr]->num_channels);
case EDMA_CONT_PARAMS_FIXED_EXACT:
case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
- return reserve_contiguous_params(ctlr, id, count, slot);
+ return reserve_contiguous_slots(ctlr, id, count, slot);
default:
return -EINVAL;
}
@@ -799,21 +845,21 @@ int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
EXPORT_SYMBOL(edma_alloc_cont_slots);
/**
- * edma_free_cont_slots - deallocate DMA parameter RAMs
- * @slot: first parameter RAM of a set of parameter RAMs to be freed
- * @count: the number of contiguous parameter RAMs to be freed
+ * edma_free_cont_slots - deallocate DMA parameter RAM slots
+ * @slot: first parameter RAM of a set of parameter RAM slots to be freed
+ * @count: the number of contiguous parameter RAM slots to be freed
*
* This deallocates the parameter RAM slots allocated by
* edma_alloc_cont_slots.
* Callers/applications need to keep track of sets of contiguous
- * parameter RAMs that have been allocated using the edma_alloc_cont_slots
+ * parameter RAM slots that have been allocated using the edma_alloc_cont_slots
* API.
* Callers are responsible for ensuring the slots are inactive, and will
* not be activated.
*/
int edma_free_cont_slots(unsigned slot, int count)
{
- unsigned ctlr;
+ unsigned ctlr, slot_to_free;
int i;
ctlr = EDMA_CTLR(slot);
@@ -826,11 +872,11 @@ int edma_free_cont_slots(unsigned slot, int count)
for (i = slot; i < slot + count; ++i) {
ctlr = EDMA_CTLR(i);
- slot = EDMA_CHAN_SLOT(i);
+ slot_to_free = EDMA_CHAN_SLOT(i);
- memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
+ memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
&dummy_paramset, PARM_SIZE);
- clear_bit(slot, edma_info[ctlr]->edma_inuse);
+ clear_bit(slot_to_free, edma_info[ctlr]->edma_inuse);
}
return 0;
@@ -1210,7 +1256,7 @@ int edma_start(unsigned channel)
unsigned int mask = (1 << (channel & 0x1f));
/* EDMA channels without event association */
- if (test_bit(channel, edma_info[ctlr]->edma_noevent)) {
+ if (test_bit(channel, edma_info[ctlr]->edma_unused)) {
pr_debug("EDMA: ESR%d %08x\n", j,
edma_shadow0_read_array(ctlr, SH_ESR, j));
edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
@@ -1335,7 +1381,6 @@ static int __init edma_probe(struct platform_device *pdev)
const s8 (*queue_tc_mapping)[2];
int i, j, found = 0;
int status = -1;
- const s8 *noevent;
int irq[EDMA_MAX_CC] = {0, 0};
int err_irq[EDMA_MAX_CC] = {0, 0};
struct resource *r[EDMA_MAX_CC] = {NULL};
@@ -1398,11 +1443,9 @@ static int __init edma_probe(struct platform_device *pdev)
memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
&dummy_paramset, PARM_SIZE);
- noevent = info[j].noevent;
- if (noevent) {
- while (*noevent != -1)
- set_bit(*noevent++, edma_info[j]->edma_noevent);
- }
+ /* Mark all channels as unused */
+ memset(edma_info[j]->edma_unused, 0xff,
+ sizeof(edma_info[j]->edma_unused));
sprintf(irq_name, "edma%d", j);
irq[j] = platform_get_irq_byname(pdev, irq_name);
@@ -1458,6 +1501,7 @@ static int __init edma_probe(struct platform_device *pdev)
edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
edma_write_array(j, EDMA_QRAE, i, 0x0);
}
+ arch_num_cc++;
}
if (tc_errs_handled) {
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2025-04-27 14:59:50 +0200