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firewire: ohci: restart iso DMA contexts on resume from low power mode

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Restore iso channels DMA so that iso channels could continue to work
after resume from RAM/disk.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Maxim Levitsky 2010-11-29 04:09:50 +02:00 committed by Stefan Richter
parent 8662b6b029
commit dd23736e09
1 changed files with 46 additions and 8 deletions
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54
drivers/firewire/ohci.c
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@ -18,6 +18,7 @@
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/delay.h>
@ -153,6 +154,7 @@ struct context {
descriptor_callback_t callback;
struct tasklet_struct tasklet;
bool active;
};
#define IT_HEADER_SY(v) ((v) << 0)
@ -168,6 +170,9 @@ struct iso_context {
int excess_bytes;
void *header;
size_t header_length;
u8 sync;
u8 tags;
};
#define CONFIG_ROM_SIZE 1024
@ -184,7 +189,8 @@ struct fw_ohci {
u32 bus_time;
bool is_root;
bool csr_state_setclear_abdicate;
int n_ir;
int n_it;
/*
* Spinlock for accessing fw_ohci data. Never call out of
* this driver with this lock held.
@ -1161,6 +1167,7 @@ static struct descriptor *context_get_descriptors(struct context *ctx,
static void context_run(struct context *ctx, u32 extra)
{
struct fw_ohci *ohci = ctx->ohci;
ctx->active = true;
reg_write(ohci, COMMAND_PTR(ctx->regs),
le32_to_cpu(ctx->last->branch_address));
@ -1192,6 +1199,7 @@ static void context_stop(struct context *ctx)
u32 reg;
int i;
ctx->active = false;
reg_write(ctx->ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
flush_writes(ctx->ohci);
@ -2641,6 +2649,10 @@ static int ohci_start_iso(struct fw_iso_context *base,
reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
reg_write(ohci, CONTEXT_MATCH(ctx->context.regs), match);
context_run(&ctx->context, control);
ctx->sync = sync;
ctx->tags = tags;
break;
}
@ -2738,6 +2750,26 @@ static int ohci_set_iso_channels(struct fw_iso_context *base, u64 *channels)
return ret;
}
#ifdef CONFIG_PM
static void ohci_resume_iso_dma(struct fw_ohci *ohci)
{
int i;
struct iso_context *ctx;
for (i = 0 ; i < ohci->n_ir ; i++) {
ctx = &ohci->ir_context_list[i];
if (ctx->context.active)
ohci_start_iso(&ctx->base, 0, ctx->sync, ctx->tags);
}
for (i = 0 ; i < ohci->n_it ; i++) {
ctx = &ohci->it_context_list[i];
if (ctx->context.active)
ohci_start_iso(&ctx->base, 0, ctx->sync, ctx->tags);
}
}
#endif
static int queue_iso_transmit(struct iso_context *ctx,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
@ -3047,7 +3079,7 @@ static int __devinit pci_probe(struct pci_dev *dev,
struct fw_ohci *ohci;
u32 bus_options, max_receive, link_speed, version;
u64 guid;
int i, err, n_ir, n_it;
int i, err;
size_t size;
ohci = kzalloc(sizeof(*ohci), GFP_KERNEL);
@ -3141,15 +3173,15 @@ static int __devinit pci_probe(struct pci_dev *dev,
ohci->ir_context_channels = ~0ULL;
ohci->ir_context_mask = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet);
reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, ~0);
n_ir = hweight32(ohci->ir_context_mask);
size = sizeof(struct iso_context) * n_ir;
ohci->n_ir = hweight32(ohci->ir_context_mask);
size = sizeof(struct iso_context) * ohci->n_ir;
ohci->ir_context_list = kzalloc(size, GFP_KERNEL);
reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, ~0);
ohci->it_context_mask = reg_read(ohci, OHCI1394_IsoXmitIntMaskSet);
reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, ~0);
n_it = hweight32(ohci->it_context_mask);
size = sizeof(struct iso_context) * n_it;
ohci->n_it = hweight32(ohci->it_context_mask);
size = sizeof(struct iso_context) * ohci->n_it;
ohci->it_context_list = kzalloc(size, GFP_KERNEL);
if (ohci->it_context_list == NULL || ohci->ir_context_list == NULL) {
@ -3174,7 +3206,7 @@ static int __devinit pci_probe(struct pci_dev *dev,
fw_notify("Added fw-ohci device %s, OHCI v%x.%x, "
"%d IR + %d IT contexts, quirks 0x%x\n",
dev_name(&dev->dev), version >> 16, version & 0xff,
n_ir, n_it, ohci->quirks);
ohci->n_ir, ohci->n_it, ohci->quirks);
return 0;
@ -3291,7 +3323,13 @@ static int pci_resume(struct pci_dev *dev)
reg_write(ohci, OHCI1394_GUIDHi, (u32)(ohci->card.guid >> 32));
}
return ohci_enable(&ohci->card, NULL, 0);
err = ohci_enable(&ohci->card, NULL, 0);
if (err)
return err;
ohci_resume_iso_dma(ohci);
return 0;
}
#endif