summaryrefslogtreecommitdiff
path: root/arch/mips/pci
diff options
context:
space:
mode:
authorDavid Daney <ddaney@caviumnetworks.com>2010-07-23 10:43:45 -0700
committerRalf Baechle <ralf@linux-mips.org>2010-08-05 13:26:10 +0100
commita894f14d7ebe9e278b496b1e653ae57f2eff514e (patch)
treeadf5e2caef5ec79c7256d50d6a7f3fdff94e8d15 /arch/mips/pci
parentcb8f55b9207df96ccc332748eb3d154cd2e8014f (diff)
MIPS: Octeon: Move MSI code out of octeon-irq.c.
Put all the MSI code in one place (msi-octeon.c). This simplifies octeon-irq.c and gets rid of some ugly #ifdefs Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1484/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci')
-rw-r--r--arch/mips/pci/msi-octeon.c90
1 files changed, 88 insertions, 2 deletions
diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c
index 03742e647657..1e31526f0e53 100644
--- a/arch/mips/pci/msi-octeon.c
+++ b/arch/mips/pci/msi-octeon.c
@@ -249,12 +249,99 @@ static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id)
return IRQ_NONE;
}
+static DEFINE_RAW_SPINLOCK(octeon_irq_msi_lock);
+
+static void octeon_irq_msi_ack(unsigned int irq)
+{
+ if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
+ /* These chips have PCI */
+ cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
+ 1ull << (irq - OCTEON_IRQ_MSI_BIT0));
+ } else {
+ /*
+ * These chips have PCIe. Thankfully the ACK doesn't
+ * need any locking.
+ */
+ cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
+ 1ull << (irq - OCTEON_IRQ_MSI_BIT0));
+ }
+}
+
+static void octeon_irq_msi_eoi(unsigned int irq)
+{
+ /* Nothing needed */
+}
+
+static void octeon_irq_msi_enable(unsigned int irq)
+{
+ if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
+ /*
+ * Octeon PCI doesn't have the ability to mask/unmask
+ * MSI interrupts individually. Instead of
+ * masking/unmasking them in groups of 16, we simple
+ * assume MSI devices are well behaved. MSI
+ * interrupts are always enable and the ACK is assumed
+ * to be enough.
+ */
+ } else {
+ /* These chips have PCIe. Note that we only support
+ * the first 64 MSI interrupts. Unfortunately all the
+ * MSI enables are in the same register. We use
+ * MSI0's lock to control access to them all.
+ */
+ uint64_t en;
+ unsigned long flags;
+ raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags);
+ en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
+ en |= 1ull << (irq - OCTEON_IRQ_MSI_BIT0);
+ cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
+ cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
+ raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
+ }
+}
+
+static void octeon_irq_msi_disable(unsigned int irq)
+{
+ if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
+ /* See comment in enable */
+ } else {
+ /*
+ * These chips have PCIe. Note that we only support
+ * the first 64 MSI interrupts. Unfortunately all the
+ * MSI enables are in the same register. We use
+ * MSI0's lock to control access to them all.
+ */
+ uint64_t en;
+ unsigned long flags;
+ raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags);
+ en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
+ en &= ~(1ull << (irq - OCTEON_IRQ_MSI_BIT0));
+ cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
+ cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
+ raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
+ }
+}
+
+static struct irq_chip octeon_irq_chip_msi = {
+ .name = "MSI",
+ .enable = octeon_irq_msi_enable,
+ .disable = octeon_irq_msi_disable,
+ .ack = octeon_irq_msi_ack,
+ .eoi = octeon_irq_msi_eoi,
+};
/*
* Initializes the MSI interrupt handling code
*/
-int octeon_msi_initialize(void)
+static int __init octeon_msi_initialize(void)
{
+ int irq;
+
+ for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_BIT63; irq++) {
+ set_irq_chip_and_handler(irq, &octeon_irq_chip_msi,
+ handle_percpu_irq);
+ }
+
if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
IRQF_SHARED,
@@ -284,5 +371,4 @@ int octeon_msi_initialize(void)
}
return 0;
}
-
subsys_initcall(octeon_msi_initialize);