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path: root/arch/mips/pci/msi-octeon.c
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Diffstat (limited to 'arch/mips/pci/msi-octeon.c')
-rw-r--r--arch/mips/pci/msi-octeon.c277
1 files changed, 210 insertions, 67 deletions
diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c
index 03742e647657..d8080499872a 100644
--- a/arch/mips/pci/msi-octeon.c
+++ b/arch/mips/pci/msi-octeon.c
@@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (C) 2005-2009 Cavium Networks
+ * Copyright (C) 2005-2009, 2010 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/init.h>
@@ -22,7 +22,7 @@
* Each bit in msi_free_irq_bitmask represents a MSI interrupt that is
* in use.
*/
-static uint64_t msi_free_irq_bitmask;
+static u64 msi_free_irq_bitmask[4];
/*
* Each bit in msi_multiple_irq_bitmask tells that the device using
@@ -30,7 +30,7 @@ static uint64_t msi_free_irq_bitmask;
* is used so we can disable all of the MSI interrupts when a device
* uses multiple.
*/
-static uint64_t msi_multiple_irq_bitmask;
+static u64 msi_multiple_irq_bitmask[4];
/*
* This lock controls updates to msi_free_irq_bitmask and
@@ -38,6 +38,11 @@ static uint64_t msi_multiple_irq_bitmask;
*/
static DEFINE_SPINLOCK(msi_free_irq_bitmask_lock);
+/*
+ * Number of MSI IRQs used. This variable is set up in
+ * the module init time.
+ */
+static int msi_irq_size;
/**
* Called when a driver request MSI interrupts instead of the
@@ -54,12 +59,13 @@ static DEFINE_SPINLOCK(msi_free_irq_bitmask_lock);
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
struct msi_msg msg;
- uint16_t control;
+ u16 control;
int configured_private_bits;
int request_private_bits;
- int irq;
+ int irq = 0;
int irq_step;
- uint64_t search_mask;
+ u64 search_mask;
+ int index;
/*
* Read the MSI config to figure out how many IRQs this device
@@ -111,29 +117,31 @@ try_only_one:
* use.
*/
spin_lock(&msi_free_irq_bitmask_lock);
- for (irq = 0; irq < 64; irq += irq_step) {
- if ((msi_free_irq_bitmask & (search_mask << irq)) == 0) {
- msi_free_irq_bitmask |= search_mask << irq;
- msi_multiple_irq_bitmask |= (search_mask >> 1) << irq;
- break;
+ for (index = 0; index < msi_irq_size/64; index++) {
+ for (irq = 0; irq < 64; irq += irq_step) {
+ if ((msi_free_irq_bitmask[index] & (search_mask << irq)) == 0) {
+ msi_free_irq_bitmask[index] |= search_mask << irq;
+ msi_multiple_irq_bitmask[index] |= (search_mask >> 1) << irq;
+ goto msi_irq_allocated;
+ }
}
}
+msi_irq_allocated:
spin_unlock(&msi_free_irq_bitmask_lock);
/* Make sure the search for available interrupts didn't fail */
if (irq >= 64) {
if (request_private_bits) {
- pr_err("arch_setup_msi_irq: Unable to find %d free "
- "interrupts, trying just one",
+ pr_err("arch_setup_msi_irq: Unable to find %d free interrupts, trying just one",
1 << request_private_bits);
request_private_bits = 0;
goto try_only_one;
} else
- panic("arch_setup_msi_irq: Unable to find a free MSI "
- "interrupt");
+ panic("arch_setup_msi_irq: Unable to find a free MSI interrupt");
}
/* MSI interrupts start at logical IRQ OCTEON_IRQ_MSI_BIT0 */
+ irq += index*64;
irq += OCTEON_IRQ_MSI_BIT0;
switch (octeon_dma_bar_type) {
@@ -169,6 +177,34 @@ try_only_one:
return 0;
}
+int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ struct msi_desc *entry;
+ int ret;
+
+ /*
+ * MSI-X is not supported.
+ */
+ if (type == PCI_CAP_ID_MSIX)
+ return -EINVAL;
+
+ /*
+ * If an architecture wants to support multiple MSI, it needs to
+ * override arch_setup_msi_irqs()
+ */
+ if (type == PCI_CAP_ID_MSI && nvec > 1)
+ return 1;
+
+ list_for_each_entry(entry, &dev->msi_list, list) {
+ ret = arch_setup_msi_irq(dev, entry);
+ if (ret < 0)
+ return ret;
+ if (ret > 0)
+ return -ENOSPC;
+ }
+
+ return 0;
+}
/**
* Called when a device no longer needs its MSI interrupts. All
@@ -179,12 +215,18 @@ try_only_one:
void arch_teardown_msi_irq(unsigned int irq)
{
int number_irqs;
- uint64_t bitmask;
+ u64 bitmask;
+ int index = 0;
+ int irq0;
- if ((irq < OCTEON_IRQ_MSI_BIT0) || (irq > OCTEON_IRQ_MSI_BIT63))
+ if ((irq < OCTEON_IRQ_MSI_BIT0)
+ || (irq > msi_irq_size + OCTEON_IRQ_MSI_BIT0))
panic("arch_teardown_msi_irq: Attempted to teardown illegal "
"MSI interrupt (%d)", irq);
+
irq -= OCTEON_IRQ_MSI_BIT0;
+ index = irq / 64;
+ irq0 = irq % 64;
/*
* Count the number of IRQs we need to free by looking at the
@@ -192,97 +234,198 @@ void arch_teardown_msi_irq(unsigned int irq)
* IRQ is also owned by this device.
*/
number_irqs = 0;
- while ((irq+number_irqs < 64) &&
- (msi_multiple_irq_bitmask & (1ull << (irq + number_irqs))))
+ while ((irq0 + number_irqs < 64) &&
+ (msi_multiple_irq_bitmask[index]
+ & (1ull << (irq0 + number_irqs))))
number_irqs++;
number_irqs++;
/* Mask with one bit for each IRQ */
bitmask = (1 << number_irqs) - 1;
/* Shift the mask to the correct bit location */
- bitmask <<= irq;
- if ((msi_free_irq_bitmask & bitmask) != bitmask)
+ bitmask <<= irq0;
+ if ((msi_free_irq_bitmask[index] & bitmask) != bitmask)
panic("arch_teardown_msi_irq: Attempted to teardown MSI "
"interrupt (%d) not in use", irq);
/* Checks are done, update the in use bitmask */
spin_lock(&msi_free_irq_bitmask_lock);
- msi_free_irq_bitmask &= ~bitmask;
- msi_multiple_irq_bitmask &= ~bitmask;
+ msi_free_irq_bitmask[index] &= ~bitmask;
+ msi_multiple_irq_bitmask[index] &= ~bitmask;
spin_unlock(&msi_free_irq_bitmask_lock);
}
+static DEFINE_RAW_SPINLOCK(octeon_irq_msi_lock);
+
+static u64 msi_rcv_reg[4];
+static u64 mis_ena_reg[4];
+
+static void octeon_irq_msi_enable_pcie(unsigned int irq)
+{
+ u64 en;
+ unsigned long flags;
+ int msi_number = irq - OCTEON_IRQ_MSI_BIT0;
+ int irq_index = msi_number >> 6;
+ int irq_bit = msi_number & 0x3f;
+
+ raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags);
+ en = cvmx_read_csr(mis_ena_reg[irq_index]);
+ en |= 1ull << irq_bit;
+ cvmx_write_csr(mis_ena_reg[irq_index], en);
+ cvmx_read_csr(mis_ena_reg[irq_index]);
+ raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
+}
+
+static void octeon_irq_msi_disable_pcie(unsigned int irq)
+{
+ u64 en;
+ unsigned long flags;
+ int msi_number = irq - OCTEON_IRQ_MSI_BIT0;
+ int irq_index = msi_number >> 6;
+ int irq_bit = msi_number & 0x3f;
+
+ raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags);
+ en = cvmx_read_csr(mis_ena_reg[irq_index]);
+ en &= ~(1ull << irq_bit);
+ cvmx_write_csr(mis_ena_reg[irq_index], en);
+ cvmx_read_csr(mis_ena_reg[irq_index]);
+ raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
+}
+
+static struct irq_chip octeon_irq_chip_msi_pcie = {
+ .name = "MSI",
+ .enable = octeon_irq_msi_enable_pcie,
+ .disable = octeon_irq_msi_disable_pcie,
+};
+
+static void octeon_irq_msi_enable_pci(unsigned int irq)
+{
+ /*
+ * 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
+ */
+}
+
+static void octeon_irq_msi_disable_pci(unsigned int irq)
+{
+ /* See comment in enable */
+}
+
+static struct irq_chip octeon_irq_chip_msi_pci = {
+ .name = "MSI",
+ .enable = octeon_irq_msi_enable_pci,
+ .disable = octeon_irq_msi_disable_pci,
+};
/*
* Called by the interrupt handling code when an MSI interrupt
* occurs.
*/
-static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id)
+static irqreturn_t __octeon_msi_do_interrupt(int index, u64 msi_bits)
{
- uint64_t msi_bits;
int irq;
+ int bit;
- if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE)
- msi_bits = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_RCV0);
- else
- msi_bits = cvmx_read_csr(CVMX_NPI_NPI_MSI_RCV);
- irq = fls64(msi_bits);
- if (irq) {
- irq += OCTEON_IRQ_MSI_BIT0 - 1;
- if (irq_desc[irq].action) {
- do_IRQ(irq);
- return IRQ_HANDLED;
- } else {
- pr_err("Spurious MSI interrupt %d\n", irq);
- if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
- /* These chips have PCIe */
- cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
- 1ull << (irq -
- OCTEON_IRQ_MSI_BIT0));
- } else {
- /* These chips have PCI */
- cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
- 1ull << (irq -
- OCTEON_IRQ_MSI_BIT0));
- }
- }
+ bit = fls64(msi_bits);
+ if (bit) {
+ bit--;
+ /* Acknowledge it first. */
+ cvmx_write_csr(msi_rcv_reg[index], 1ull << bit);
+
+ irq = bit + OCTEON_IRQ_MSI_BIT0 + 64 * index;
+ do_IRQ(irq);
+ return IRQ_HANDLED;
}
return IRQ_NONE;
}
+#define OCTEON_MSI_INT_HANDLER_X(x) \
+static irqreturn_t octeon_msi_interrupt##x(int cpl, void *dev_id) \
+{ \
+ u64 msi_bits = cvmx_read_csr(msi_rcv_reg[(x)]); \
+ return __octeon_msi_do_interrupt((x), msi_bits); \
+}
+
+/*
+ * Create octeon_msi_interrupt{0-3} function body
+ */
+OCTEON_MSI_INT_HANDLER_X(0);
+OCTEON_MSI_INT_HANDLER_X(1);
+OCTEON_MSI_INT_HANDLER_X(2);
+OCTEON_MSI_INT_HANDLER_X(3);
/*
* Initializes the MSI interrupt handling code
*/
-int octeon_msi_initialize(void)
+int __init octeon_msi_initialize(void)
{
+ int irq;
+ struct irq_chip *msi;
+
+ if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE) {
+ msi_rcv_reg[0] = CVMX_PEXP_NPEI_MSI_RCV0;
+ msi_rcv_reg[1] = CVMX_PEXP_NPEI_MSI_RCV1;
+ msi_rcv_reg[2] = CVMX_PEXP_NPEI_MSI_RCV2;
+ msi_rcv_reg[3] = CVMX_PEXP_NPEI_MSI_RCV3;
+ mis_ena_reg[0] = CVMX_PEXP_NPEI_MSI_ENB0;
+ mis_ena_reg[1] = CVMX_PEXP_NPEI_MSI_ENB1;
+ mis_ena_reg[2] = CVMX_PEXP_NPEI_MSI_ENB2;
+ mis_ena_reg[3] = CVMX_PEXP_NPEI_MSI_ENB3;
+ msi = &octeon_irq_chip_msi_pcie;
+ } else {
+ msi_rcv_reg[0] = CVMX_NPI_NPI_MSI_RCV;
+#define INVALID_GENERATE_ADE 0x8700000000000000ULL;
+ msi_rcv_reg[1] = INVALID_GENERATE_ADE;
+ msi_rcv_reg[2] = INVALID_GENERATE_ADE;
+ msi_rcv_reg[3] = INVALID_GENERATE_ADE;
+ mis_ena_reg[0] = INVALID_GENERATE_ADE;
+ mis_ena_reg[1] = INVALID_GENERATE_ADE;
+ mis_ena_reg[2] = INVALID_GENERATE_ADE;
+ mis_ena_reg[3] = INVALID_GENERATE_ADE;
+ msi = &octeon_irq_chip_msi_pci;
+ }
+
+ for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_LAST; irq++)
+ set_irq_chip_and_handler(irq, msi, handle_simple_irq);
+
if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
- if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
- IRQF_SHARED,
- "MSI[0:63]", octeon_msi_interrupt))
+ if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt0,
+ 0, "MSI[0:63]", octeon_msi_interrupt0))
panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
+
+ if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt1,
+ 0, "MSI[64:127]", octeon_msi_interrupt1))
+ panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed");
+
+ if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt2,
+ 0, "MSI[127:191]", octeon_msi_interrupt2))
+ panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed");
+
+ if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt3,
+ 0, "MSI[192:255]", octeon_msi_interrupt3))
+ panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed");
+
+ msi_irq_size = 256;
} else if (octeon_is_pci_host()) {
- if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
- IRQF_SHARED,
- "MSI[0:15]", octeon_msi_interrupt))
+ if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt0,
+ 0, "MSI[0:15]", octeon_msi_interrupt0))
panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
- if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt,
- IRQF_SHARED,
- "MSI[16:31]", octeon_msi_interrupt))
+ if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt0,
+ 0, "MSI[16:31]", octeon_msi_interrupt0))
panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed");
- if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt,
- IRQF_SHARED,
- "MSI[32:47]", octeon_msi_interrupt))
+ if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt0,
+ 0, "MSI[32:47]", octeon_msi_interrupt0))
panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed");
- if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt,
- IRQF_SHARED,
- "MSI[48:63]", octeon_msi_interrupt))
+ if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt0,
+ 0, "MSI[48:63]", octeon_msi_interrupt0))
panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed");
-
+ msi_irq_size = 64;
}
return 0;
}
-
subsys_initcall(octeon_msi_initialize);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 19:57:48 +0000