diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0075-irqchip-armada-370-xp-implement-MSI-support.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0075-irqchip-armada-370-xp-implement-MSI-support.patch | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0075-irqchip-armada-370-xp-implement-MSI-support.patch b/target/linux/mvebu/patches-3.10/0075-irqchip-armada-370-xp-implement-MSI-support.patch new file mode 100644 index 0000000000..999b493c55 --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0075-irqchip-armada-370-xp-implement-MSI-support.patch @@ -0,0 +1,270 @@ +From eaa70d53f6b827f147d775a3de7ff3ef27d0fae6 Mon Sep 17 00:00:00 2001 +From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Date: Thu, 6 Jun 2013 18:25:16 +0200 +Subject: [PATCH 075/203] irqchip: armada-370-xp: implement MSI support + +This commit introduces the support for the MSI interrupts in the +armada-370-xp interrupt controller driver. It registers an MSI chip to +the MSI chip registry, which will be used by the Marvell PCIe host +controller driver. + +The MSI interrupts use the 16 high doorbells, and are therefore +notified using IRQ1 of the main interrupt controller. + +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com> +--- + .../devicetree/bindings/arm/armada-370-xp-mpic.txt | 3 + + drivers/irqchip/irq-armada-370-xp.c | 182 ++++++++++++++++++++- + 2 files changed, 184 insertions(+), 1 deletion(-) + +--- a/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt ++++ b/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt +@@ -4,6 +4,8 @@ Marvell Armada 370 and Armada XP Interru + Required properties: + - compatible: Should be "marvell,mpic" + - interrupt-controller: Identifies the node as an interrupt controller. ++- msi-controller: Identifies the node as an PCI Message Signaled ++ Interrupt controller. + - #interrupt-cells: The number of cells to define the interrupts. Should be 1. + The cell is the IRQ number + +@@ -24,6 +26,7 @@ Example: + #address-cells = <1>; + #size-cells = <1>; + interrupt-controller; ++ msi-controller; + reg = <0xd0020a00 0x1d0>, + <0xd0021070 0x58>; + }; +--- a/drivers/irqchip/irq-armada-370-xp.c ++++ b/drivers/irqchip/irq-armada-370-xp.c +@@ -21,7 +21,10 @@ + #include <linux/io.h> + #include <linux/of_address.h> + #include <linux/of_irq.h> ++#include <linux/of_pci.h> + #include <linux/irqdomain.h> ++#include <linux/slab.h> ++#include <linux/msi.h> + #include <asm/mach/arch.h> + #include <asm/exception.h> + #include <asm/smp_plat.h> +@@ -51,12 +54,22 @@ + #define IPI_DOORBELL_START (0) + #define IPI_DOORBELL_END (8) + #define IPI_DOORBELL_MASK 0xFF ++#define PCI_MSI_DOORBELL_START (16) ++#define PCI_MSI_DOORBELL_NR (16) ++#define PCI_MSI_DOORBELL_END (32) ++#define PCI_MSI_DOORBELL_MASK 0xFFFF0000 + + static DEFINE_RAW_SPINLOCK(irq_controller_lock); + + static void __iomem *per_cpu_int_base; + static void __iomem *main_int_base; + static struct irq_domain *armada_370_xp_mpic_domain; ++#ifdef CONFIG_PCI_MSI ++static struct irq_domain *armada_370_xp_msi_domain; ++static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR); ++static DEFINE_MUTEX(msi_used_lock); ++static phys_addr_t msi_doorbell_addr; ++#endif + + /* + * In SMP mode: +@@ -87,6 +100,144 @@ static void armada_370_xp_irq_unmask(str + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); + } + ++#ifdef CONFIG_PCI_MSI ++ ++static int armada_370_xp_alloc_msi(void) ++{ ++ int hwirq; ++ ++ mutex_lock(&msi_used_lock); ++ hwirq = find_first_zero_bit(&msi_used, PCI_MSI_DOORBELL_NR); ++ if (hwirq >= PCI_MSI_DOORBELL_NR) ++ hwirq = -ENOSPC; ++ else ++ set_bit(hwirq, msi_used); ++ mutex_unlock(&msi_used_lock); ++ ++ return hwirq; ++} ++ ++static void armada_370_xp_free_msi(int hwirq) ++{ ++ mutex_lock(&msi_used_lock); ++ if (!test_bit(hwirq, msi_used)) ++ pr_err("trying to free unused MSI#%d\n", hwirq); ++ else ++ clear_bit(hwirq, msi_used); ++ mutex_unlock(&msi_used_lock); ++} ++ ++static int armada_370_xp_setup_msi_irq(struct msi_chip *chip, ++ struct pci_dev *pdev, ++ struct msi_desc *desc) ++{ ++ struct msi_msg msg; ++ irq_hw_number_t hwirq; ++ int virq; ++ ++ hwirq = armada_370_xp_alloc_msi(); ++ if (hwirq < 0) ++ return hwirq; ++ ++ virq = irq_create_mapping(armada_370_xp_msi_domain, hwirq); ++ if (!virq) { ++ armada_370_xp_free_msi(hwirq); ++ return -EINVAL; ++ } ++ ++ irq_set_msi_desc(virq, desc); ++ ++ msg.address_lo = msi_doorbell_addr; ++ msg.address_hi = 0; ++ msg.data = 0xf00 | (hwirq + 16); ++ ++ write_msi_msg(virq, &msg); ++ return 0; ++} ++ ++static void armada_370_xp_teardown_msi_irq(struct msi_chip *chip, ++ unsigned int irq) ++{ ++ struct irq_data *d = irq_get_irq_data(irq); ++ irq_dispose_mapping(irq); ++ armada_370_xp_free_msi(d->hwirq); ++} ++ ++static struct irq_chip armada_370_xp_msi_irq_chip = { ++ .name = "armada_370_xp_msi_irq", ++ .irq_enable = unmask_msi_irq, ++ .irq_disable = mask_msi_irq, ++ .irq_mask = mask_msi_irq, ++ .irq_unmask = unmask_msi_irq, ++}; ++ ++static int armada_370_xp_msi_map(struct irq_domain *domain, unsigned int virq, ++ irq_hw_number_t hw) ++{ ++ irq_set_chip_and_handler(virq, &armada_370_xp_msi_irq_chip, ++ handle_simple_irq); ++ set_irq_flags(virq, IRQF_VALID); ++ ++ return 0; ++} ++ ++static const struct irq_domain_ops armada_370_xp_msi_irq_ops = { ++ .map = armada_370_xp_msi_map, ++}; ++ ++static int armada_370_xp_msi_init(struct device_node *node, ++ phys_addr_t main_int_phys_base) ++{ ++ struct msi_chip *msi_chip; ++ u32 reg; ++ int ret; ++ ++ msi_doorbell_addr = main_int_phys_base + ++ ARMADA_370_XP_SW_TRIG_INT_OFFS; ++ ++ msi_chip = kzalloc(sizeof(*msi_chip), GFP_KERNEL); ++ if (!msi_chip) ++ return -ENOMEM; ++ ++ msi_chip->setup_irq = armada_370_xp_setup_msi_irq; ++ msi_chip->teardown_irq = armada_370_xp_teardown_msi_irq; ++ msi_chip->of_node = node; ++ ++ armada_370_xp_msi_domain = ++ irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR, ++ &armada_370_xp_msi_irq_ops, ++ NULL); ++ if (!armada_370_xp_msi_domain) { ++ kfree(msi_chip); ++ return -ENOMEM; ++ } ++ ++ ret = of_pci_msi_chip_add(msi_chip); ++ if (ret < 0) { ++ irq_domain_remove(armada_370_xp_msi_domain); ++ kfree(msi_chip); ++ return ret; ++ } ++ ++ reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS) ++ | PCI_MSI_DOORBELL_MASK; ++ ++ writel(reg, per_cpu_int_base + ++ ARMADA_370_XP_IN_DRBEL_MSK_OFFS); ++ ++ /* Unmask IPI interrupt */ ++ writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); ++ ++ return 0; ++} ++#else ++static inline int armada_370_xp_msi_init(struct device_node *node, ++ phys_addr_t main_int_phys_base) ++{ ++ return 0; ++} ++#endif ++ + #ifdef CONFIG_SMP + static int armada_xp_set_affinity(struct irq_data *d, + const struct cpumask *mask_val, bool force) +@@ -214,12 +365,39 @@ armada_370_xp_handle_irq(struct pt_regs + if (irqnr > 1022) + break; + +- if (irqnr > 0) { ++ if (irqnr > 1) { + irqnr = irq_find_mapping(armada_370_xp_mpic_domain, + irqnr); + handle_IRQ(irqnr, regs); + continue; + } ++ ++#ifdef CONFIG_PCI_MSI ++ /* MSI handling */ ++ if (irqnr == 1) { ++ u32 msimask, msinr; ++ ++ msimask = readl_relaxed(per_cpu_int_base + ++ ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS) ++ & PCI_MSI_DOORBELL_MASK; ++ ++ writel(~PCI_MSI_DOORBELL_MASK, per_cpu_int_base + ++ ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS); ++ ++ for (msinr = PCI_MSI_DOORBELL_START; ++ msinr < PCI_MSI_DOORBELL_END; msinr++) { ++ int irq; ++ ++ if (!(msimask & BIT(msinr))) ++ continue; ++ ++ irq = irq_find_mapping(armada_370_xp_msi_domain, ++ msinr - 16); ++ handle_IRQ(irq, regs); ++ } ++ } ++#endif ++ + #ifdef CONFIG_SMP + /* IPI Handling */ + if (irqnr == 0) { +@@ -292,6 +470,8 @@ static int __init armada_370_xp_mpic_of_ + + #endif + ++ armada_370_xp_msi_init(node, main_int_res.start); ++ + set_handle_irq(armada_370_xp_handle_irq); + + return 0; |