diff options
Diffstat (limited to 'arch/mips/pci/msi-octeon.c')
| -rw-r--r-- | arch/mips/pci/msi-octeon.c | 277 |
1 files changed, 210 insertions, 67 deletions
diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c index 03742e6..d808049 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); |