[PATCH] firewire: Implement suspend/resume PCI driver hooks.

[Kristian HÃgsberg]

It's a low-impact design, that just makes suspend/resume look like
a bus reset to the upper level drivers, but it should be sufficient.

Signed-off-by: Kristian HÃgsberg <krh@xxxxxxxxxx>
Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
---
 drivers/firewire/fw-card.c |    5 -
 drivers/firewire/fw-ohci.c |  187 +++++++++++++++++++++++++++++---------------
 2 files changed, 123 insertions(+), 69 deletions(-)

diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 636151a..9eb1eda 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -407,11 +407,6 @@ fw_card_add(struct fw_card *card,
 	card->link_speed = link_speed;
 	card->guid = guid;
 
-	/* Activate link_on bit and contender bit in our self ID packets.*/
-	if (card->driver->update_phy_reg(card, 4, 0,
-					 PHY_LINK_ACTIVE | PHY_CONTENDER) < 0)
-		return -EIO;
-
 	/*
 	 * The subsystem grabs a reference when the card is added and
 	 * drops it when the driver calls fw_core_remove_card.
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 2e4cfa5..0d08bf9 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -417,12 +417,21 @@ ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci, u32 regs)
 	ctx->current_buffer = ab.next;
 	ctx->pointer = ctx->current_buffer->data;
 
-	reg_write(ctx->ohci, COMMAND_PTR(ctx->regs),
-		  le32_to_cpu(ab.descriptor.branch_address));
+	return 0;
+}
+
+static void ar_context_run(struct ar_context *ctx)
+{
+	struct ar_buffer *ab = ctx->current_buffer;
+	dma_addr_t ab_bus;
+	size_t offset;
+
+	offset = offsetof(struct ar_buffer, data);
+	ab_bus = ab->descriptor.data_address - offset;
+
+	reg_write(ctx->ohci, COMMAND_PTR(ctx->regs), ab_bus | 1);
 	reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN);
 	flush_writes(ctx->ohci);
-
-	return 0;
 }
 
 static void context_tasklet(unsigned long data)
@@ -1039,11 +1048,78 @@ static irqreturn_t irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static int software_reset(struct fw_ohci *ohci)
+{
+	int i;
+
+	reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
+
+	for (i = 0; i < OHCI_LOOP_COUNT; i++) {
+		if ((reg_read(ohci, OHCI1394_HCControlSet) &
+		     OHCI1394_HCControl_softReset) == 0)
+			return 0;
+		msleep(1);
+	}
+
+	return -EBUSY;
+}
+
 static int ohci_enable(struct fw_card *card, u32 *config_rom, size_t length)
 {
 	struct fw_ohci *ohci = fw_ohci(card);
 	struct pci_dev *dev = to_pci_dev(card->device);
 
+	if (software_reset(ohci)) {
+		fw_error("Failed to reset ohci card.\n");
+		return -EBUSY;
+	}
+
+	/*
+	 * Now enable LPS, which we need in order to start accessing
+	 * most of the registers.  In fact, on some cards (ALI M5251),
+	 * accessing registers in the SClk domain without LPS enabled
+	 * will lock up the machine.  Wait 50msec to make sure we have
+	 * full link enabled.
+	 */
+	reg_write(ohci, OHCI1394_HCControlSet,
+		  OHCI1394_HCControl_LPS |
+		  OHCI1394_HCControl_postedWriteEnable);
+	flush_writes(ohci);
+	msleep(50);
+
+	reg_write(ohci, OHCI1394_HCControlClear,
+		  OHCI1394_HCControl_noByteSwapData);
+
+	reg_write(ohci, OHCI1394_LinkControlSet,
+		  OHCI1394_LinkControl_rcvSelfID |
+		  OHCI1394_LinkControl_cycleTimerEnable |
+		  OHCI1394_LinkControl_cycleMaster);
+
+	reg_write(ohci, OHCI1394_ATRetries,
+		  OHCI1394_MAX_AT_REQ_RETRIES |
+		  (OHCI1394_MAX_AT_RESP_RETRIES << 4) |
+		  (OHCI1394_MAX_PHYS_RESP_RETRIES << 8));
+
+	ar_context_run(&ohci->ar_request_ctx);
+	ar_context_run(&ohci->ar_response_ctx);
+
+	reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
+	reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
+	reg_write(ohci, OHCI1394_IntEventClear, ~0);
+	reg_write(ohci, OHCI1394_IntMaskClear, ~0);
+	reg_write(ohci, OHCI1394_IntMaskSet,
+		  OHCI1394_selfIDComplete |
+		  OHCI1394_RQPkt | OHCI1394_RSPkt |
+		  OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
+		  OHCI1394_isochRx | OHCI1394_isochTx |
+		  OHCI1394_masterIntEnable |
+		  OHCI1394_cycle64Seconds);
+
+	/* Activate link_on bit and contender bit in our self ID packets.*/
+	if (ohci_update_phy_reg(card, 4, 0,
+				PHY_LINK_ACTIVE | PHY_CONTENDER) < 0)
+		return -EIO;
+
 	/*
 	 * When the link is not yet enabled, the atomic config rom
 	 * update mechanism described below in ohci_set_config_rom()
@@ -1701,22 +1777,6 @@ static const struct fw_card_driver ohci_driver = {
 	.stop_iso		= ohci_stop_iso,
 };
 
-static int software_reset(struct fw_ohci *ohci)
-{
-	int i;
-
-	reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
-
-	for (i = 0; i < OHCI_LOOP_COUNT; i++) {
-		if ((reg_read(ohci, OHCI1394_HCControlSet) &
-		     OHCI1394_HCControl_softReset) == 0)
-			return 0;
-		msleep(1);
-	}
-
-	return -EBUSY;
-}
-
 static int __devinit
 pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 {
@@ -1762,33 +1822,6 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 		goto fail_iomem;
 	}
 
-	if (software_reset(ohci)) {
-		fw_error("Failed to reset ohci card.\n");
-		err = -EBUSY;
-		goto fail_registers;
-	}
-
-	/*
-	 * Now enable LPS, which we need in order to start accessing
-	 * most of the registers.  In fact, on some cards (ALI M5251),
-	 * accessing registers in the SClk domain without LPS enabled
-	 * will lock up the machine.  Wait 50msec to make sure we have
-	 * full link enabled.
-	 */
-	reg_write(ohci, OHCI1394_HCControlSet,
-		  OHCI1394_HCControl_LPS |
-		  OHCI1394_HCControl_postedWriteEnable);
-	flush_writes(ohci);
-	msleep(50);
-
-	reg_write(ohci, OHCI1394_HCControlClear,
-		  OHCI1394_HCControl_noByteSwapData);
-
-	reg_write(ohci, OHCI1394_LinkControlSet,
-		  OHCI1394_LinkControl_rcvSelfID |
-		  OHCI1394_LinkControl_cycleTimerEnable |
-		  OHCI1394_LinkControl_cycleMaster);
-
 	ar_context_init(&ohci->ar_request_ctx, ohci,
 			OHCI1394_AsReqRcvContextControlSet);
 
@@ -1801,11 +1834,6 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 	context_init(&ohci->at_response_ctx, ohci, AT_BUFFER_SIZE,
 		     OHCI1394_AsRspTrContextControlSet, handle_at_packet);
 
-	reg_write(ohci, OHCI1394_ATRetries,
-		  OHCI1394_MAX_AT_REQ_RETRIES |
-		  (OHCI1394_MAX_AT_RESP_RETRIES << 4) |
-		  (OHCI1394_MAX_PHYS_RESP_RETRIES << 8));
-
 	reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, ~0);
 	ohci->it_context_mask = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet);
 	reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, ~0);
@@ -1835,18 +1863,6 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 		goto fail_registers;
 	}
 
-	reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
-	reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
-	reg_write(ohci, OHCI1394_IntEventClear, ~0);
-	reg_write(ohci, OHCI1394_IntMaskClear, ~0);
-	reg_write(ohci, OHCI1394_IntMaskSet,
-		  OHCI1394_selfIDComplete |
-		  OHCI1394_RQPkt | OHCI1394_RSPkt |
-		  OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
-		  OHCI1394_isochRx | OHCI1394_isochTx |
-		  OHCI1394_masterIntEnable |
-		  OHCI1394_cycle64Seconds);
-
 	bus_options = reg_read(ohci, OHCI1394_BusOptions);
 	max_receive = (bus_options >> 12) & 0xf;
 	link_speed = bus_options & 0x7;
@@ -1908,6 +1924,45 @@ static void pci_remove(struct pci_dev *dev)
 	fw_notify("Removed fw-ohci device.\n");
 }
 
+#ifdef CONFIG_PM
+static int pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct fw_ohci *ohci = pci_get_drvdata(pdev);
+	int err;
+
+	software_reset(ohci);
+	free_irq(pdev->irq, ohci);
+	err = pci_save_state(pdev);
+	if (err) {
+		fw_error("pci_save_state failed with %d", err);
+		return err;
+	}
+	err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	if (err) {
+		fw_error("pci_set_power_state failed with %d", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int pci_resume(struct pci_dev *pdev)
+{
+	struct fw_ohci *ohci = pci_get_drvdata(pdev);
+	int err;
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+	err = pci_enable_device(pdev);
+	if (err) {
+		fw_error("pci_enable_device failed with %d", err);
+		return err;
+	}
+
+	return ohci_enable(&ohci->card, ohci->config_rom, CONFIG_ROM_SIZE);
+}
+#endif
+
 static struct pci_device_id pci_table[] = {
 	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_FIREWIRE_OHCI, ~0) },
 	{ }
@@ -1920,6 +1975,10 @@ static struct pci_driver fw_ohci_pci_driver = {
 	.id_table	= pci_table,
 	.probe		= pci_probe,
 	.remove		= pci_remove,
+#ifdef CONFIG_PM
+	.resume		= pci_resume,
+	.suspend	= pci_suspend,
+#endif
 };
 
 MODULE_AUTHOR("Kristian Hoegsberg <krh@xxxxxxxxxxxxx>");
-- 
1.5.1.6