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firewire: ohci: add MSI support 

This patch adds support for message-signaled interrupts.

Any native PCI-Express OHCI controller should support MSI, but most are
just PCI cores behind a PCI-E/PCI bridge.  The only chips that are known
to claim to support MSI are the Lucent/Agere/LSI FW643 and the VIA
VT6315, none of which I have been able to test.

Due to the high level of trust I have in the competence of these and any
future chip makers, I thought it a good idea to add a disable-MSI quirk.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

Tested Agere FW643 rev 07 [11c1:5901] and JMicron JMB381 [197b:2380].
Added a quirks list entry for JMB38X since it kept its count of MSI
events consistently at zero.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Clemens Ladisch 2010-06-05 12:31:25 +02:00 committed by Stefan Richter
parent 148c7866c3
commit 262444eecc
1 changed files with 12 additions and 3 deletions
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15
drivers/firewire/ohci.c
View File

@ -231,12 +231,14 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
static char ohci_driver_name[] = KBUILD_MODNAME;
#define PCI_DEVICE_ID_JMICRON_JMB38X_FW 0x2380
#define PCI_DEVICE_ID_TI_TSB12LV22 0x8009
#define QUIRK_CYCLE_TIMER 1
#define QUIRK_RESET_PACKET 2
#define QUIRK_BE_HEADERS 4
#define QUIRK_NO_1394A 8
#define QUIRK_NO_MSI 16
/* In case of multiple matches in ohci_quirks[], only the first one is used. */
static const struct {
@ -247,6 +249,7 @@ static const struct {
QUIRK_NO_1394A},
{PCI_VENDOR_ID_TI, PCI_ANY_ID, QUIRK_RESET_PACKET},
{PCI_VENDOR_ID_AL, PCI_ANY_ID, QUIRK_CYCLE_TIMER},
{PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB38X_FW, QUIRK_NO_MSI},
{PCI_VENDOR_ID_NEC, PCI_ANY_ID, QUIRK_CYCLE_TIMER},
{PCI_VENDOR_ID_VIA, PCI_ANY_ID, QUIRK_CYCLE_TIMER},
{PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_FW, QUIRK_BE_HEADERS},
@ -260,6 +263,7 @@ MODULE_PARM_DESC(quirks, "Chip quirks (default = 0"
", reset packet generation = " __stringify(QUIRK_RESET_PACKET)
", AR/selfID endianess = " __stringify(QUIRK_BE_HEADERS)
", no 1394a enhancements = " __stringify(QUIRK_NO_1394A)
", disable MSI = " __stringify(QUIRK_NO_MSI)
")");
#define OHCI_PARAM_DEBUG_AT_AR 1
@ -1704,10 +1708,13 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
if (!(ohci->quirks & QUIRK_NO_MSI))
pci_enable_msi(dev);
if (request_irq(dev->irq, irq_handler,
IRQF_SHARED, ohci_driver_name, ohci)) {
fw_error("Failed to allocate shared interrupt %d.\n",
dev->irq);
pci_dev_msi_enabled(dev) ? 0 : IRQF_SHARED,
ohci_driver_name, ohci)) {
fw_error("Failed to allocate interrupt %d.\n", dev->irq);
pci_disable_msi(dev);
dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
ohci->config_rom, ohci->config_rom_bus);
return -EIO;
@ -2622,6 +2629,7 @@ static void pci_remove(struct pci_dev *dev)
context_release(&ohci->at_response_ctx);
kfree(ohci->it_context_list);
kfree(ohci->ir_context_list);
pci_disable_msi(dev);
pci_iounmap(dev, ohci->registers);
pci_release_region(dev, 0);
pci_disable_device(dev);
@ -2639,6 +2647,7 @@ static int pci_suspend(struct pci_dev *dev, pm_message_t state)
software_reset(ohci);
free_irq(dev->irq, ohci);
pci_disable_msi(dev);
err = pci_save_state(dev);
if (err) {
fw_error("pci_save_state failed\n");