+++ /dev/null
-From 3bc2b2348835f6edd33c383a2fbcf15fe3dac3b2 Mon Sep 17 00:00:00 2001
-From: Ray Jui <rjui@broadcom.com>
-Date: Wed, 6 Jan 2016 18:04:35 -0600
-Subject: [PATCH 4/5] PCI: iproc: Add iProc PCIe MSI support
-
-Add PCIe MSI support for both PAXB and PAXC interfaces on all iProc-based
-platforms.
-
-The iProc PCIe MSI support deploys an event queue-based implementation.
-Each event queue is serviced by a GIC interrupt and can support up to 64
-MSI vectors. Host memory is allocated for the event queues, and each event
-queue consists of 64 word-sized entries. MSI data is written to the lower
-16-bit of each entry, whereas the upper 16-bit of the entry is reserved for
-the controller for internal processing.
-
-Each event queue is tracked by a head pointer and tail pointer. Head
-pointer indicates the next entry in the event queue to be processed by
-the driver and is updated by the driver after processing is done.
-The controller uses the tail pointer as the next MSI data insertion
-point. The controller ensures MSI data is flushed to host memory before
-updating the tail pointer and then triggering the interrupt.
-
-MSI IRQ affinity is supported by evenly distributing the interrupts to each
-CPU core. MSI vector is moved from one GIC interrupt to another in order
-to steer to the target CPU.
-
-Therefore, the actual number of supported MSI vectors is:
-
- M * 64 / N
-
-where M denotes the number of GIC interrupts (event queues), and N denotes
-the number of CPU cores.
-
-This iProc event queue-based MSI support should not be used with newer
-platforms with integrated MSI support in the GIC (e.g., giv2m or
-gicv3-its).
-
-[bhelgaas: fold in Kconfig fixes from Arnd Bergmann <arnd@arndb.de>]
-Signed-off-by: Ray Jui <rjui@broadcom.com>
-Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
-Reviewed-by: Anup Patel <anup.patel@broadcom.com>
-Reviewed-by: Vikram Prakash <vikramp@broadcom.com>
-Reviewed-by: Scott Branden <sbranden@broadcom.com>
-Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
----
- drivers/pci/host/Kconfig | 10 +
- drivers/pci/host/Makefile | 1 +
- drivers/pci/host/pcie-iproc-bcma.c | 1 +
- drivers/pci/host/pcie-iproc-msi.c | 675 +++++++++++++++++++++++++++++++++
- drivers/pci/host/pcie-iproc-platform.c | 1 +
- drivers/pci/host/pcie-iproc.c | 26 ++
- drivers/pci/host/pcie-iproc.h | 23 +-
- 7 files changed, 735 insertions(+), 2 deletions(-)
- create mode 100644 drivers/pci/host/pcie-iproc-msi.c
-
---- a/drivers/pci/host/Kconfig
-+++ b/drivers/pci/host/Kconfig
-@@ -133,5 +133,15 @@ config PCIE_IPROC_BCMA
- help
- Say Y here if you want to use the Broadcom iProc PCIe controller
- through the BCMA bus interface
-+
-+config PCIE_IPROC_MSI
-+ bool "Broadcom iProc PCIe MSI support"
-+ depends on PCIE_IPROC_PLATFORM || PCIE_IPROC_BCMA
-+ depends on PCI_MSI
-+ select PCI_MSI_IRQ_DOMAIN
-+ default ARCH_BCM_IPROC
-+ help
-+ Say Y here if you want to enable MSI support for Broadcom's iProc
-+ PCIe controller
-
- endmenu
---- a/drivers/pci/host/Makefile
-+++ b/drivers/pci/host/Makefile
-@@ -14,5 +14,6 @@ obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
- obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
- obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
- obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
-+obj-$(CONFIG_PCIE_IPROC_MSI) += pcie-iproc-msi.o
- obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
- obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
---- a/drivers/pci/host/pcie-iproc-bcma.c
-+++ b/drivers/pci/host/pcie-iproc-bcma.c
-@@ -55,6 +55,7 @@ static int iproc_pcie_bcma_probe(struct
- bcma_set_drvdata(bdev, pcie);
-
- pcie->base = bdev->io_addr;
-+ pcie->base_addr = bdev->addr;
-
- res_mem.start = bdev->addr_s[0];
- res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
---- /dev/null
-+++ b/drivers/pci/host/pcie-iproc-msi.c
-@@ -0,0 +1,675 @@
-+/*
-+ * Copyright (C) 2015 Broadcom Corporation
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#include <linux/interrupt.h>
-+#include <linux/irqchip/chained_irq.h>
-+#include <linux/irqdomain.h>
-+#include <linux/msi.h>
-+#include <linux/of_irq.h>
-+#include <linux/of_pci.h>
-+#include <linux/pci.h>
-+
-+#include "pcie-iproc.h"
-+
-+#define IPROC_MSI_INTR_EN_SHIFT 11
-+#define IPROC_MSI_INTR_EN BIT(IPROC_MSI_INTR_EN_SHIFT)
-+#define IPROC_MSI_INT_N_EVENT_SHIFT 1
-+#define IPROC_MSI_INT_N_EVENT BIT(IPROC_MSI_INT_N_EVENT_SHIFT)
-+#define IPROC_MSI_EQ_EN_SHIFT 0
-+#define IPROC_MSI_EQ_EN BIT(IPROC_MSI_EQ_EN_SHIFT)
-+
-+#define IPROC_MSI_EQ_MASK 0x3f
-+
-+/* Max number of GIC interrupts */
-+#define NR_HW_IRQS 6
-+
-+/* Number of entries in each event queue */
-+#define EQ_LEN 64
-+
-+/* Size of each event queue memory region */
-+#define EQ_MEM_REGION_SIZE SZ_4K
-+
-+/* Size of each MSI address region */
-+#define MSI_MEM_REGION_SIZE SZ_4K
-+
-+enum iproc_msi_reg {
-+ IPROC_MSI_EQ_PAGE = 0,
-+ IPROC_MSI_EQ_PAGE_UPPER,
-+ IPROC_MSI_PAGE,
-+ IPROC_MSI_PAGE_UPPER,
-+ IPROC_MSI_CTRL,
-+ IPROC_MSI_EQ_HEAD,
-+ IPROC_MSI_EQ_TAIL,
-+ IPROC_MSI_INTS_EN,
-+ IPROC_MSI_REG_SIZE,
-+};
-+
-+struct iproc_msi;
-+
-+/**
-+ * iProc MSI group
-+ *
-+ * One MSI group is allocated per GIC interrupt, serviced by one iProc MSI
-+ * event queue.
-+ *
-+ * @msi: pointer to iProc MSI data
-+ * @gic_irq: GIC interrupt
-+ * @eq: Event queue number
-+ */
-+struct iproc_msi_grp {
-+ struct iproc_msi *msi;
-+ int gic_irq;
-+ unsigned int eq;
-+};
-+
-+/**
-+ * iProc event queue based MSI
-+ *
-+ * Only meant to be used on platforms without MSI support integrated into the
-+ * GIC.
-+ *
-+ * @pcie: pointer to iProc PCIe data
-+ * @reg_offsets: MSI register offsets
-+ * @grps: MSI groups
-+ * @nr_irqs: number of total interrupts connected to GIC
-+ * @nr_cpus: number of toal CPUs
-+ * @has_inten_reg: indicates the MSI interrupt enable register needs to be
-+ * set explicitly (required for some legacy platforms)
-+ * @bitmap: MSI vector bitmap
-+ * @bitmap_lock: lock to protect access to the MSI bitmap
-+ * @nr_msi_vecs: total number of MSI vectors
-+ * @inner_domain: inner IRQ domain
-+ * @msi_domain: MSI IRQ domain
-+ * @nr_eq_region: required number of 4K aligned memory region for MSI event
-+ * queues
-+ * @nr_msi_region: required number of 4K aligned address region for MSI posted
-+ * writes
-+ * @eq_cpu: pointer to allocated memory region for MSI event queues
-+ * @eq_dma: DMA address of MSI event queues
-+ * @msi_addr: MSI address
-+ */
-+struct iproc_msi {
-+ struct iproc_pcie *pcie;
-+ const u16 (*reg_offsets)[IPROC_MSI_REG_SIZE];
-+ struct iproc_msi_grp *grps;
-+ int nr_irqs;
-+ int nr_cpus;
-+ bool has_inten_reg;
-+ unsigned long *bitmap;
-+ struct mutex bitmap_lock;
-+ unsigned int nr_msi_vecs;
-+ struct irq_domain *inner_domain;
-+ struct irq_domain *msi_domain;
-+ unsigned int nr_eq_region;
-+ unsigned int nr_msi_region;
-+ void *eq_cpu;
-+ dma_addr_t eq_dma;
-+ phys_addr_t msi_addr;
-+};
-+
-+static const u16 iproc_msi_reg_paxb[NR_HW_IRQS][IPROC_MSI_REG_SIZE] = {
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x210, 0x250, 0x254, 0x208 },
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x214, 0x258, 0x25c, 0x208 },
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x218, 0x260, 0x264, 0x208 },
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x21c, 0x268, 0x26c, 0x208 },
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x220, 0x270, 0x274, 0x208 },
-+ { 0x200, 0x2c0, 0x204, 0x2c4, 0x224, 0x278, 0x27c, 0x208 },
-+};
-+
-+static const u16 iproc_msi_reg_paxc[NR_HW_IRQS][IPROC_MSI_REG_SIZE] = {
-+ { 0xc00, 0xc04, 0xc08, 0xc0c, 0xc40, 0xc50, 0xc60 },
-+ { 0xc10, 0xc14, 0xc18, 0xc1c, 0xc44, 0xc54, 0xc64 },
-+ { 0xc20, 0xc24, 0xc28, 0xc2c, 0xc48, 0xc58, 0xc68 },
-+ { 0xc30, 0xc34, 0xc38, 0xc3c, 0xc4c, 0xc5c, 0xc6c },
-+};
-+
-+static inline u32 iproc_msi_read_reg(struct iproc_msi *msi,
-+ enum iproc_msi_reg reg,
-+ unsigned int eq)
-+{
-+ struct iproc_pcie *pcie = msi->pcie;
-+
-+ return readl_relaxed(pcie->base + msi->reg_offsets[eq][reg]);
-+}
-+
-+static inline void iproc_msi_write_reg(struct iproc_msi *msi,
-+ enum iproc_msi_reg reg,
-+ int eq, u32 val)
-+{
-+ struct iproc_pcie *pcie = msi->pcie;
-+
-+ writel_relaxed(val, pcie->base + msi->reg_offsets[eq][reg]);
-+}
-+
-+static inline u32 hwirq_to_group(struct iproc_msi *msi, unsigned long hwirq)
-+{
-+ return (hwirq % msi->nr_irqs);
-+}
-+
-+static inline unsigned int iproc_msi_addr_offset(struct iproc_msi *msi,
-+ unsigned long hwirq)
-+{
-+ if (msi->nr_msi_region > 1)
-+ return hwirq_to_group(msi, hwirq) * MSI_MEM_REGION_SIZE;
-+ else
-+ return hwirq_to_group(msi, hwirq) * sizeof(u32);
-+}
-+
-+static inline unsigned int iproc_msi_eq_offset(struct iproc_msi *msi, u32 eq)
-+{
-+ if (msi->nr_eq_region > 1)
-+ return eq * EQ_MEM_REGION_SIZE;
-+ else
-+ return eq * EQ_LEN * sizeof(u32);
-+}
-+
-+static struct irq_chip iproc_msi_irq_chip = {
-+ .name = "iProc-MSI",
-+};
-+
-+static struct msi_domain_info iproc_msi_domain_info = {
-+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-+ MSI_FLAG_PCI_MSIX,
-+ .chip = &iproc_msi_irq_chip,
-+};
-+
-+/*
-+ * In iProc PCIe core, each MSI group is serviced by a GIC interrupt and a
-+ * dedicated event queue. Each MSI group can support up to 64 MSI vectors.
-+ *
-+ * The number of MSI groups varies between different iProc SoCs. The total
-+ * number of CPU cores also varies. To support MSI IRQ affinity, we
-+ * distribute GIC interrupts across all available CPUs. MSI vector is moved
-+ * from one GIC interrupt to another to steer to the target CPU.
-+ *
-+ * Assuming:
-+ * - the number of MSI groups is M
-+ * - the number of CPU cores is N
-+ * - M is always a multiple of N
-+ *
-+ * Total number of raw MSI vectors = M * 64
-+ * Total number of supported MSI vectors = (M * 64) / N
-+ */
-+static inline int hwirq_to_cpu(struct iproc_msi *msi, unsigned long hwirq)
-+{
-+ return (hwirq % msi->nr_cpus);
-+}
-+
-+static inline unsigned long hwirq_to_canonical_hwirq(struct iproc_msi *msi,
-+ unsigned long hwirq)
-+{
-+ return (hwirq - hwirq_to_cpu(msi, hwirq));
-+}
-+
-+static int iproc_msi_irq_set_affinity(struct irq_data *data,
-+ const struct cpumask *mask, bool force)
-+{
-+ struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
-+ int target_cpu = cpumask_first(mask);
-+ int curr_cpu;
-+
-+ curr_cpu = hwirq_to_cpu(msi, data->hwirq);
-+ if (curr_cpu == target_cpu)
-+ return IRQ_SET_MASK_OK_DONE;
-+
-+ /* steer MSI to the target CPU */
-+ data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
-+
-+ return IRQ_SET_MASK_OK;
-+}
-+
-+static void iproc_msi_irq_compose_msi_msg(struct irq_data *data,
-+ struct msi_msg *msg)
-+{
-+ struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
-+ dma_addr_t addr;
-+
-+ addr = msi->msi_addr + iproc_msi_addr_offset(msi, data->hwirq);
-+ msg->address_lo = lower_32_bits(addr);
-+ msg->address_hi = upper_32_bits(addr);
-+ msg->data = data->hwirq;
-+}
-+
-+static struct irq_chip iproc_msi_bottom_irq_chip = {
-+ .name = "MSI",
-+ .irq_set_affinity = iproc_msi_irq_set_affinity,
-+ .irq_compose_msi_msg = iproc_msi_irq_compose_msi_msg,
-+};
-+
-+static int iproc_msi_irq_domain_alloc(struct irq_domain *domain,
-+ unsigned int virq, unsigned int nr_irqs,
-+ void *args)
-+{
-+ struct iproc_msi *msi = domain->host_data;
-+ int hwirq;
-+
-+ mutex_lock(&msi->bitmap_lock);
-+
-+ /* Allocate 'nr_cpus' number of MSI vectors each time */
-+ hwirq = bitmap_find_next_zero_area(msi->bitmap, msi->nr_msi_vecs, 0,
-+ msi->nr_cpus, 0);
-+ if (hwirq < msi->nr_msi_vecs) {
-+ bitmap_set(msi->bitmap, hwirq, msi->nr_cpus);
-+ } else {
-+ mutex_unlock(&msi->bitmap_lock);
-+ return -ENOSPC;
-+ }
-+
-+ mutex_unlock(&msi->bitmap_lock);
-+
-+ irq_domain_set_info(domain, virq, hwirq, &iproc_msi_bottom_irq_chip,
-+ domain->host_data, handle_simple_irq, NULL, NULL);
-+
-+ return 0;
-+}
-+
-+static void iproc_msi_irq_domain_free(struct irq_domain *domain,
-+ unsigned int virq, unsigned int nr_irqs)
-+{
-+ struct irq_data *data = irq_domain_get_irq_data(domain, virq);
-+ struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
-+ unsigned int hwirq;
-+
-+ mutex_lock(&msi->bitmap_lock);
-+
-+ hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq);
-+ bitmap_clear(msi->bitmap, hwirq, msi->nr_cpus);
-+
-+ mutex_unlock(&msi->bitmap_lock);
-+
-+ irq_domain_free_irqs_parent(domain, virq, nr_irqs);
-+}
-+
-+static const struct irq_domain_ops msi_domain_ops = {
-+ .alloc = iproc_msi_irq_domain_alloc,
-+ .free = iproc_msi_irq_domain_free,
-+};
-+
-+static inline u32 decode_msi_hwirq(struct iproc_msi *msi, u32 eq, u32 head)
-+{
-+ u32 *msg, hwirq;
-+ unsigned int offs;
-+
-+ offs = iproc_msi_eq_offset(msi, eq) + head * sizeof(u32);
-+ msg = (u32 *)(msi->eq_cpu + offs);
-+ hwirq = *msg & IPROC_MSI_EQ_MASK;
-+
-+ /*
-+ * Since we have multiple hwirq mapped to a single MSI vector,
-+ * now we need to derive the hwirq at CPU0. It can then be used to
-+ * mapped back to virq.
-+ */
-+ return hwirq_to_canonical_hwirq(msi, hwirq);
-+}
-+
-+static void iproc_msi_handler(struct irq_desc *desc)
-+{
-+ struct irq_chip *chip = irq_desc_get_chip(desc);
-+ struct iproc_msi_grp *grp;
-+ struct iproc_msi *msi;
-+ struct iproc_pcie *pcie;
-+ u32 eq, head, tail, nr_events;
-+ unsigned long hwirq;
-+ int virq;
-+
-+ chained_irq_enter(chip, desc);
-+
-+ grp = irq_desc_get_handler_data(desc);
-+ msi = grp->msi;
-+ pcie = msi->pcie;
-+ eq = grp->eq;
-+
-+ /*
-+ * iProc MSI event queue is tracked by head and tail pointers. Head
-+ * pointer indicates the next entry (MSI data) to be consumed by SW in
-+ * the queue and needs to be updated by SW. iProc MSI core uses the
-+ * tail pointer as the next data insertion point.
-+ *
-+ * Entries between head and tail pointers contain valid MSI data. MSI
-+ * data is guaranteed to be in the event queue memory before the tail
-+ * pointer is updated by the iProc MSI core.
-+ */
-+ head = iproc_msi_read_reg(msi, IPROC_MSI_EQ_HEAD,
-+ eq) & IPROC_MSI_EQ_MASK;
-+ do {
-+ tail = iproc_msi_read_reg(msi, IPROC_MSI_EQ_TAIL,
-+ eq) & IPROC_MSI_EQ_MASK;
-+
-+ /*
-+ * Figure out total number of events (MSI data) to be
-+ * processed.
-+ */
-+ nr_events = (tail < head) ?
-+ (EQ_LEN - (head - tail)) : (tail - head);
-+ if (!nr_events)
-+ break;
-+
-+ /* process all outstanding events */
-+ while (nr_events--) {
-+ hwirq = decode_msi_hwirq(msi, eq, head);
-+ virq = irq_find_mapping(msi->inner_domain, hwirq);
-+ generic_handle_irq(virq);
-+
-+ head++;
-+ head %= EQ_LEN;
-+ }
-+
-+ /*
-+ * Now all outstanding events have been processed. Update the
-+ * head pointer.
-+ */
-+ iproc_msi_write_reg(msi, IPROC_MSI_EQ_HEAD, eq, head);
-+
-+ /*
-+ * Now go read the tail pointer again to see if there are new
-+ * oustanding events that came in during the above window.
-+ */
-+ } while (true);
-+
-+ chained_irq_exit(chip, desc);
-+}
-+
-+static void iproc_msi_enable(struct iproc_msi *msi)
-+{
-+ int i, eq;
-+ u32 val;
-+
-+ /* Program memory region for each event queue */
-+ for (i = 0; i < msi->nr_eq_region; i++) {
-+ dma_addr_t addr = msi->eq_dma + (i * EQ_MEM_REGION_SIZE);
-+
-+ iproc_msi_write_reg(msi, IPROC_MSI_EQ_PAGE, i,
-+ lower_32_bits(addr));
-+ iproc_msi_write_reg(msi, IPROC_MSI_EQ_PAGE_UPPER, i,
-+ upper_32_bits(addr));
-+ }
-+
-+ /* Program address region for MSI posted writes */
-+ for (i = 0; i < msi->nr_msi_region; i++) {
-+ phys_addr_t addr = msi->msi_addr + (i * MSI_MEM_REGION_SIZE);
-+
-+ iproc_msi_write_reg(msi, IPROC_MSI_PAGE, i,
-+ lower_32_bits(addr));
-+ iproc_msi_write_reg(msi, IPROC_MSI_PAGE_UPPER, i,
-+ upper_32_bits(addr));
-+ }
-+
-+ for (eq = 0; eq < msi->nr_irqs; eq++) {
-+ /* Enable MSI event queue */
-+ val = IPROC_MSI_INTR_EN | IPROC_MSI_INT_N_EVENT |
-+ IPROC_MSI_EQ_EN;
-+ iproc_msi_write_reg(msi, IPROC_MSI_CTRL, eq, val);
-+
-+ /*
-+ * Some legacy platforms require the MSI interrupt enable
-+ * register to be set explicitly.
-+ */
-+ if (msi->has_inten_reg) {
-+ val = iproc_msi_read_reg(msi, IPROC_MSI_INTS_EN, eq);
-+ val |= BIT(eq);
-+ iproc_msi_write_reg(msi, IPROC_MSI_INTS_EN, eq, val);
-+ }
-+ }
-+}
-+
-+static void iproc_msi_disable(struct iproc_msi *msi)
-+{
-+ u32 eq, val;
-+
-+ for (eq = 0; eq < msi->nr_irqs; eq++) {
-+ if (msi->has_inten_reg) {
-+ val = iproc_msi_read_reg(msi, IPROC_MSI_INTS_EN, eq);
-+ val &= ~BIT(eq);
-+ iproc_msi_write_reg(msi, IPROC_MSI_INTS_EN, eq, val);
-+ }
-+
-+ val = iproc_msi_read_reg(msi, IPROC_MSI_CTRL, eq);
-+ val &= ~(IPROC_MSI_INTR_EN | IPROC_MSI_INT_N_EVENT |
-+ IPROC_MSI_EQ_EN);
-+ iproc_msi_write_reg(msi, IPROC_MSI_CTRL, eq, val);
-+ }
-+}
-+
-+static int iproc_msi_alloc_domains(struct device_node *node,
-+ struct iproc_msi *msi)
-+{
-+ msi->inner_domain = irq_domain_add_linear(NULL, msi->nr_msi_vecs,
-+ &msi_domain_ops, msi);
-+ if (!msi->inner_domain)
-+ return -ENOMEM;
-+
-+ msi->msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node),
-+ &iproc_msi_domain_info,
-+ msi->inner_domain);
-+ if (!msi->msi_domain) {
-+ irq_domain_remove(msi->inner_domain);
-+ return -ENOMEM;
-+ }
-+
-+ return 0;
-+}
-+
-+static void iproc_msi_free_domains(struct iproc_msi *msi)
-+{
-+ if (msi->msi_domain)
-+ irq_domain_remove(msi->msi_domain);
-+
-+ if (msi->inner_domain)
-+ irq_domain_remove(msi->inner_domain);
-+}
-+
-+static void iproc_msi_irq_free(struct iproc_msi *msi, unsigned int cpu)
-+{
-+ int i;
-+
-+ for (i = cpu; i < msi->nr_irqs; i += msi->nr_cpus) {
-+ irq_set_chained_handler_and_data(msi->grps[i].gic_irq,
-+ NULL, NULL);
-+ }
-+}
-+
-+static int iproc_msi_irq_setup(struct iproc_msi *msi, unsigned int cpu)
-+{
-+ int i, ret;
-+ cpumask_var_t mask;
-+ struct iproc_pcie *pcie = msi->pcie;
-+
-+ for (i = cpu; i < msi->nr_irqs; i += msi->nr_cpus) {
-+ irq_set_chained_handler_and_data(msi->grps[i].gic_irq,
-+ iproc_msi_handler,
-+ &msi->grps[i]);
-+ /* Dedicate GIC interrupt to each CPU core */
-+ if (alloc_cpumask_var(&mask, GFP_KERNEL)) {
-+ cpumask_clear(mask);
-+ cpumask_set_cpu(cpu, mask);
-+ ret = irq_set_affinity(msi->grps[i].gic_irq, mask);
-+ if (ret)
-+ dev_err(pcie->dev,
-+ "failed to set affinity for IRQ%d\n",
-+ msi->grps[i].gic_irq);
-+ free_cpumask_var(mask);
-+ } else {
-+ dev_err(pcie->dev, "failed to alloc CPU mask\n");
-+ ret = -EINVAL;
-+ }
-+
-+ if (ret) {
-+ /* Free all configured/unconfigured IRQs */
-+ iproc_msi_irq_free(msi, cpu);
-+ return ret;
-+ }
-+ }
-+
-+ return 0;
-+}
-+
-+int iproc_msi_init(struct iproc_pcie *pcie, struct device_node *node)
-+{
-+ struct iproc_msi *msi;
-+ int i, ret;
-+ unsigned int cpu;
-+
-+ if (!of_device_is_compatible(node, "brcm,iproc-msi"))
-+ return -ENODEV;
-+
-+ if (!of_find_property(node, "msi-controller", NULL))
-+ return -ENODEV;
-+
-+ if (pcie->msi)
-+ return -EBUSY;
-+
-+ msi = devm_kzalloc(pcie->dev, sizeof(*msi), GFP_KERNEL);
-+ if (!msi)
-+ return -ENOMEM;
-+
-+ msi->pcie = pcie;
-+ pcie->msi = msi;
-+ msi->msi_addr = pcie->base_addr;
-+ mutex_init(&msi->bitmap_lock);
-+ msi->nr_cpus = num_possible_cpus();
-+
-+ msi->nr_irqs = of_irq_count(node);
-+ if (!msi->nr_irqs) {
-+ dev_err(pcie->dev, "found no MSI GIC interrupt\n");
-+ return -ENODEV;
-+ }
-+
-+ if (msi->nr_irqs > NR_HW_IRQS) {
-+ dev_warn(pcie->dev, "too many MSI GIC interrupts defined %d\n",
-+ msi->nr_irqs);
-+ msi->nr_irqs = NR_HW_IRQS;
-+ }
-+
-+ if (msi->nr_irqs < msi->nr_cpus) {
-+ dev_err(pcie->dev,
-+ "not enough GIC interrupts for MSI affinity\n");
-+ return -EINVAL;
-+ }
-+
-+ if (msi->nr_irqs % msi->nr_cpus != 0) {
-+ msi->nr_irqs -= msi->nr_irqs % msi->nr_cpus;
-+ dev_warn(pcie->dev, "Reducing number of interrupts to %d\n",
-+ msi->nr_irqs);
-+ }
-+
-+ switch (pcie->type) {
-+ case IPROC_PCIE_PAXB:
-+ msi->reg_offsets = iproc_msi_reg_paxb;
-+ msi->nr_eq_region = 1;
-+ msi->nr_msi_region = 1;
-+ break;
-+ case IPROC_PCIE_PAXC:
-+ msi->reg_offsets = iproc_msi_reg_paxc;
-+ msi->nr_eq_region = msi->nr_irqs;
-+ msi->nr_msi_region = msi->nr_irqs;
-+ break;
-+ default:
-+ dev_err(pcie->dev, "incompatible iProc PCIe interface\n");
-+ return -EINVAL;
-+ }
-+
-+ if (of_find_property(node, "brcm,pcie-msi-inten", NULL))
-+ msi->has_inten_reg = true;
-+
-+ msi->nr_msi_vecs = msi->nr_irqs * EQ_LEN;
-+ msi->bitmap = devm_kcalloc(pcie->dev, BITS_TO_LONGS(msi->nr_msi_vecs),
-+ sizeof(*msi->bitmap), GFP_KERNEL);
-+ if (!msi->bitmap)
-+ return -ENOMEM;
-+
-+ msi->grps = devm_kcalloc(pcie->dev, msi->nr_irqs, sizeof(*msi->grps),
-+ GFP_KERNEL);
-+ if (!msi->grps)
-+ return -ENOMEM;
-+
-+ for (i = 0; i < msi->nr_irqs; i++) {
-+ unsigned int irq = irq_of_parse_and_map(node, i);
-+
-+ if (!irq) {
-+ dev_err(pcie->dev, "unable to parse/map interrupt\n");
-+ ret = -ENODEV;
-+ goto free_irqs;
-+ }
-+ msi->grps[i].gic_irq = irq;
-+ msi->grps[i].msi = msi;
-+ msi->grps[i].eq = i;
-+ }
-+
-+ /* Reserve memory for event queue and make sure memories are zeroed */
-+ msi->eq_cpu = dma_zalloc_coherent(pcie->dev,
-+ msi->nr_eq_region * EQ_MEM_REGION_SIZE,
-+ &msi->eq_dma, GFP_KERNEL);
-+ if (!msi->eq_cpu) {
-+ ret = -ENOMEM;
-+ goto free_irqs;
-+ }
-+
-+ ret = iproc_msi_alloc_domains(node, msi);
-+ if (ret) {
-+ dev_err(pcie->dev, "failed to create MSI domains\n");
-+ goto free_eq_dma;
-+ }
-+
-+ for_each_online_cpu(cpu) {
-+ ret = iproc_msi_irq_setup(msi, cpu);
-+ if (ret)
-+ goto free_msi_irq;
-+ }
-+
-+ iproc_msi_enable(msi);
-+
-+ return 0;
-+
-+free_msi_irq:
-+ for_each_online_cpu(cpu)
-+ iproc_msi_irq_free(msi, cpu);
-+ iproc_msi_free_domains(msi);
-+
-+free_eq_dma:
-+ dma_free_coherent(pcie->dev, msi->nr_eq_region * EQ_MEM_REGION_SIZE,
-+ msi->eq_cpu, msi->eq_dma);
-+
-+free_irqs:
-+ for (i = 0; i < msi->nr_irqs; i++) {
-+ if (msi->grps[i].gic_irq)
-+ irq_dispose_mapping(msi->grps[i].gic_irq);
-+ }
-+ pcie->msi = NULL;
-+ return ret;
-+}
-+EXPORT_SYMBOL(iproc_msi_init);
-+
-+void iproc_msi_exit(struct iproc_pcie *pcie)
-+{
-+ struct iproc_msi *msi = pcie->msi;
-+ unsigned int i, cpu;
-+
-+ if (!msi)
-+ return;
-+
-+ iproc_msi_disable(msi);
-+
-+ for_each_online_cpu(cpu)
-+ iproc_msi_irq_free(msi, cpu);
-+
-+ iproc_msi_free_domains(msi);
-+
-+ dma_free_coherent(pcie->dev, msi->nr_eq_region * EQ_MEM_REGION_SIZE,
-+ msi->eq_cpu, msi->eq_dma);
-+
-+ for (i = 0; i < msi->nr_irqs; i++) {
-+ if (msi->grps[i].gic_irq)
-+ irq_dispose_mapping(msi->grps[i].gic_irq);
-+ }
-+}
-+EXPORT_SYMBOL(iproc_msi_exit);
---- a/drivers/pci/host/pcie-iproc-platform.c
-+++ b/drivers/pci/host/pcie-iproc-platform.c
-@@ -71,6 +71,7 @@ static int iproc_pcie_pltfm_probe(struct
- dev_err(pcie->dev, "unable to map controller registers\n");
- return -ENOMEM;
- }
-+ pcie->base_addr = reg.start;
-
- if (of_property_read_bool(np, "brcm,pcie-ob")) {
- u32 val;
---- a/drivers/pci/host/pcie-iproc.c
-+++ b/drivers/pci/host/pcie-iproc.c
-@@ -440,6 +440,26 @@ static int iproc_pcie_map_ranges(struct
- return 0;
- }
-
-+static int iproc_pcie_msi_enable(struct iproc_pcie *pcie)
-+{
-+ struct device_node *msi_node;
-+
-+ msi_node = of_parse_phandle(pcie->dev->of_node, "msi-parent", 0);
-+ if (!msi_node)
-+ return -ENODEV;
-+
-+ /*
-+ * If another MSI controller is being used, the call below should fail
-+ * but that is okay
-+ */
-+ return iproc_msi_init(pcie, msi_node);
-+}
-+
-+static void iproc_pcie_msi_disable(struct iproc_pcie *pcie)
-+{
-+ iproc_msi_exit(pcie);
-+}
-+
- int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
- {
- int ret;
-@@ -506,6 +526,10 @@ int iproc_pcie_setup(struct iproc_pcie *
-
- iproc_pcie_enable(pcie);
-
-+ if (IS_ENABLED(CONFIG_PCI_MSI))
-+ if (iproc_pcie_msi_enable(pcie))
-+ dev_info(pcie->dev, "not using iProc MSI\n");
-+
- pci_scan_child_bus(bus);
- pci_assign_unassigned_bus_resources(bus);
- pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
-@@ -530,6 +554,8 @@ int iproc_pcie_remove(struct iproc_pcie
- pci_stop_root_bus(pcie->root_bus);
- pci_remove_root_bus(pcie->root_bus);
-
-+ iproc_pcie_msi_disable(pcie);
-+
- phy_power_off(pcie->phy);
- phy_exit(pcie->phy);
-
---- a/drivers/pci/host/pcie-iproc.h
-+++ b/drivers/pci/host/pcie-iproc.h
-@@ -41,6 +41,8 @@ struct iproc_pcie_ob {
- resource_size_t window_size;
- };
-
-+struct iproc_msi;
-+
- /**
- * iProc PCIe device
- *
-@@ -48,19 +50,21 @@ struct iproc_pcie_ob {
- * @type: iProc PCIe interface type
- * @reg_offsets: register offsets
- * @base: PCIe host controller I/O register base
-+ * @base_addr: PCIe host controller register base physical address
- * @sysdata: Per PCI controller data (ARM-specific)
- * @root_bus: pointer to root bus
- * @phy: optional PHY device that controls the Serdes
-- * @irqs: interrupt IDs
- * @map_irq: function callback to map interrupts
-- * @need_ob_cfg: indidates SW needs to configure the outbound mapping window
-+ * @need_ob_cfg: indicates SW needs to configure the outbound mapping window
- * @ob: outbound mapping parameters
-+ * @msi: MSI data
- */
- struct iproc_pcie {
- struct device *dev;
- enum iproc_pcie_type type;
- const u16 *reg_offsets;
- void __iomem *base;
-+ phys_addr_t base_addr;
- #ifdef CONFIG_ARM
- struct pci_sys_data sysdata;
- #endif
-@@ -69,9 +73,24 @@ struct iproc_pcie {
- int (*map_irq)(const struct pci_dev *, u8, u8);
- bool need_ob_cfg;
- struct iproc_pcie_ob ob;
-+ struct iproc_msi *msi;
- };
-
- int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res);
- int iproc_pcie_remove(struct iproc_pcie *pcie);
-
-+#ifdef CONFIG_PCIE_IPROC_MSI
-+int iproc_msi_init(struct iproc_pcie *pcie, struct device_node *node);
-+void iproc_msi_exit(struct iproc_pcie *pcie);
-+#else
-+static inline int iproc_msi_init(struct iproc_pcie *pcie,
-+ struct device_node *node)
-+{
-+ return -ENODEV;
-+}
-+static inline void iproc_msi_exit(struct iproc_pcie *pcie)
-+{
-+}
-+#endif
-+
- #endif /* _PCIE_IPROC_H */
projects / openwrt / staging / mkresin.git / blobdiff