summaryrefslogtreecommitdiff
path: root/drivers/pci/host
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/host')
-rw-r--r--drivers/pci/host/Kconfig18
-rw-r--r--drivers/pci/host/Makefile1
-rw-r--r--drivers/pci/host/pci-host-generic.c9
-rw-r--r--drivers/pci/host/pci-imx6.c20
-rw-r--r--drivers/pci/host/pci-versatile.c5
-rw-r--r--drivers/pci/host/pcie-iproc-bcma.c1
-rw-r--r--drivers/pci/host/pcie-iproc-msi.c675
-rw-r--r--drivers/pci/host/pcie-iproc-platform.c25
-rw-r--r--drivers/pci/host/pcie-iproc.c230
-rw-r--r--drivers/pci/host/pcie-iproc.h42
10 files changed, 951 insertions, 75 deletions
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 86c2a129a80f..98ce5474d26e 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -117,13 +117,11 @@ config PCI_VERSATILE
depends on ARCH_VERSATILE
config PCIE_IPROC
- tristate "Broadcom iProc PCIe controller"
- depends on OF && (ARM || ARM64)
- default n
+ tristate
help
This enables the iProc PCIe core controller support for Broadcom's
- iProc family of SoCs. An appropriate bus interface driver also needs
- to be enabled
+ iProc family of SoCs. An appropriate bus interface driver needs
+ to be enabled to select this.
config PCIE_IPROC_PLATFORM
tristate "Broadcom iProc PCIe platform bus driver"
@@ -146,6 +144,16 @@ config PCIE_IPROC_BCMA
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
+
config PCIE_ALTERA
bool "Altera PCIe controller"
depends on ARM || NIOS2
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 9d4d3c6924a1..0e4e95e39c21 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o
obj-$(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-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 5434c90db243..1652bc70b145 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -38,16 +38,7 @@ struct gen_pci_cfg_windows {
struct gen_pci_cfg_bus_ops *ops;
};
-/*
- * ARM pcibios functions expect the ARM struct pci_sys_data as the PCI
- * sysdata. Add pci_sys_data as the first element in struct gen_pci so
- * that when we use a gen_pci pointer as sysdata, it is also a pointer to
- * a struct pci_sys_data.
- */
struct gen_pci {
-#ifdef CONFIG_ARM
- struct pci_sys_data sys;
-#endif
struct pci_host_bridge host;
struct gen_pci_cfg_windows cfg;
struct list_head resources;
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 22e8224126fd..8e9afa5bd7de 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -32,7 +32,7 @@
#define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp)
struct imx6_pcie {
- int reset_gpio;
+ struct gpio_desc *reset_gpio;
struct clk *pcie_bus;
struct clk *pcie_phy;
struct clk *pcie;
@@ -287,10 +287,10 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
usleep_range(200, 500);
/* Some boards don't have PCIe reset GPIO. */
- if (gpio_is_valid(imx6_pcie->reset_gpio)) {
- gpio_set_value(imx6_pcie->reset_gpio, 0);
+ if (imx6_pcie->reset_gpio) {
+ gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 0);
msleep(100);
- gpio_set_value(imx6_pcie->reset_gpio, 1);
+ gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
}
return 0;
@@ -560,7 +560,6 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
{
struct imx6_pcie *imx6_pcie;
struct pcie_port *pp;
- struct device_node *np = pdev->dev.of_node;
struct resource *dbi_base;
int ret;
@@ -581,15 +580,8 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
return PTR_ERR(pp->dbi_base);
/* Fetch GPIOs */
- imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
- if (gpio_is_valid(imx6_pcie->reset_gpio)) {
- ret = devm_gpio_request_one(&pdev->dev, imx6_pcie->reset_gpio,
- GPIOF_OUT_INIT_LOW, "PCIe reset");
- if (ret) {
- dev_err(&pdev->dev, "unable to get reset gpio\n");
- return ret;
- }
- }
+ imx6_pcie->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
+ GPIOD_OUT_LOW);
/* Fetch clocks */
imx6_pcie->pcie_phy = devm_clk_get(&pdev->dev, "pcie_phy");
diff --git a/drivers/pci/host/pci-versatile.c b/drivers/pci/host/pci-versatile.c
index 0863d9cc25f8..f843a72dc51c 100644
--- a/drivers/pci/host/pci-versatile.c
+++ b/drivers/pci/host/pci-versatile.c
@@ -125,9 +125,6 @@ out_release_res:
return err;
}
-/* Unused, temporary to satisfy ARM arch code */
-struct pci_sys_data sys;
-
static int versatile_pci_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -208,7 +205,7 @@ static int versatile_pci_probe(struct platform_device *pdev)
pci_add_flags(PCI_ENABLE_PROC_DOMAINS);
pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);
- bus = pci_scan_root_bus(&pdev->dev, 0, &pci_versatile_ops, &sys, &pci_res);
+ bus = pci_scan_root_bus(&pdev->dev, 0, &pci_versatile_ops, NULL, &pci_res);
if (!bus)
return -ENOMEM;
diff --git a/drivers/pci/host/pcie-iproc-bcma.c b/drivers/pci/host/pcie-iproc-bcma.c
index 96a7d999fd5e..0d7bee4a0d26 100644
--- 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_device *bdev)
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;
diff --git a/drivers/pci/host/pcie-iproc-msi.c b/drivers/pci/host/pcie-iproc-msi.c
new file mode 100644
index 000000000000..9a2973bdc78a
--- /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);
diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index c9550dc8b8ed..1738c5288eb6 100644
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -26,8 +26,21 @@
#include "pcie-iproc.h"
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+ {
+ .compatible = "brcm,iproc-pcie",
+ .data = (int *)IPROC_PCIE_PAXB,
+ }, {
+ .compatible = "brcm,iproc-pcie-paxc",
+ .data = (int *)IPROC_PCIE_PAXC,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id;
struct iproc_pcie *pcie;
struct device_node *np = pdev->dev.of_node;
struct resource reg;
@@ -35,11 +48,16 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
LIST_HEAD(res);
int ret;
+ of_id = of_match_device(iproc_pcie_of_match_table, &pdev->dev);
+ if (!of_id)
+ return -EINVAL;
+
pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
pcie->dev = &pdev->dev;
+ pcie->type = (enum iproc_pcie_type)of_id->data;
platform_set_drvdata(pdev, pcie);
ret = of_address_to_resource(np, 0, &reg);
@@ -53,6 +71,7 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
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;
@@ -114,12 +133,6 @@ static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
return iproc_pcie_remove(pcie);
}
-static const struct of_device_id iproc_pcie_of_match_table[] = {
- { .compatible = "brcm,iproc-pcie", },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
-
static struct platform_driver iproc_pcie_pltfm_driver = {
.driver = {
.name = "iproc-pcie",
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index eac719af16aa..5816bceddb65 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -30,20 +30,16 @@
#include "pcie-iproc.h"
-#define CLK_CONTROL_OFFSET 0x000
#define EP_PERST_SOURCE_SELECT_SHIFT 2
#define EP_PERST_SOURCE_SELECT BIT(EP_PERST_SOURCE_SELECT_SHIFT)
#define EP_MODE_SURVIVE_PERST_SHIFT 1
#define EP_MODE_SURVIVE_PERST BIT(EP_MODE_SURVIVE_PERST_SHIFT)
#define RC_PCIE_RST_OUTPUT_SHIFT 0
#define RC_PCIE_RST_OUTPUT BIT(RC_PCIE_RST_OUTPUT_SHIFT)
+#define PAXC_RESET_MASK 0x7f
-#define CFG_IND_ADDR_OFFSET 0x120
#define CFG_IND_ADDR_MASK 0x00001ffc
-#define CFG_IND_DATA_OFFSET 0x124
-
-#define CFG_ADDR_OFFSET 0x1f8
#define CFG_ADDR_BUS_NUM_SHIFT 20
#define CFG_ADDR_BUS_NUM_MASK 0x0ff00000
#define CFG_ADDR_DEV_NUM_SHIFT 15
@@ -55,12 +51,8 @@
#define CFG_ADDR_CFG_TYPE_SHIFT 0
#define CFG_ADDR_CFG_TYPE_MASK 0x00000003
-#define CFG_DATA_OFFSET 0x1fc
-
-#define SYS_RC_INTX_EN 0x330
#define SYS_RC_INTX_MASK 0xf
-#define PCIE_LINK_STATUS_OFFSET 0xf0c
#define PCIE_PHYLINKUP_SHIFT 3
#define PCIE_PHYLINKUP BIT(PCIE_PHYLINKUP_SHIFT)
#define PCIE_DL_ACTIVE_SHIFT 2
@@ -71,12 +63,54 @@
#define OARR_SIZE_CFG_SHIFT 1
#define OARR_SIZE_CFG BIT(OARR_SIZE_CFG_SHIFT)
-#define OARR_LO(window) (0xd20 + (window) * 8)
-#define OARR_HI(window) (0xd24 + (window) * 8)
-#define OMAP_LO(window) (0xd40 + (window) * 8)
-#define OMAP_HI(window) (0xd44 + (window) * 8)
-
#define MAX_NUM_OB_WINDOWS 2
+#define MAX_NUM_PAXC_PF 4
+
+#define IPROC_PCIE_REG_INVALID 0xffff
+
+enum iproc_pcie_reg {
+ IPROC_PCIE_CLK_CTRL = 0,
+ IPROC_PCIE_CFG_IND_ADDR,
+ IPROC_PCIE_CFG_IND_DATA,
+ IPROC_PCIE_CFG_ADDR,
+ IPROC_PCIE_CFG_DATA,
+ IPROC_PCIE_INTX_EN,
+ IPROC_PCIE_OARR_LO,
+ IPROC_PCIE_OARR_HI,
+ IPROC_PCIE_OMAP_LO,
+ IPROC_PCIE_OMAP_HI,
+ IPROC_PCIE_LINK_STATUS,
+};
+
+/* iProc PCIe PAXB registers */
+static const u16 iproc_pcie_reg_paxb[] = {
+ [IPROC_PCIE_CLK_CTRL] = 0x000,
+ [IPROC_PCIE_CFG_IND_ADDR] = 0x120,
+ [IPROC_PCIE_CFG_IND_DATA] = 0x124,
+ [IPROC_PCIE_CFG_ADDR] = 0x1f8,
+ [IPROC_PCIE_CFG_DATA] = 0x1fc,
+ [IPROC_PCIE_INTX_EN] = 0x330,
+ [IPROC_PCIE_OARR_LO] = 0xd20,
+ [IPROC_PCIE_OARR_HI] = 0xd24,
+ [IPROC_PCIE_OMAP_LO] = 0xd40,
+ [IPROC_PCIE_OMAP_HI] = 0xd44,
+ [IPROC_PCIE_LINK_STATUS] = 0xf0c,
+};
+
+/* iProc PCIe PAXC v1 registers */
+static const u16 iproc_pcie_reg_paxc[] = {
+ [IPROC_PCIE_CLK_CTRL] = 0x000,
+ [IPROC_PCIE_CFG_IND_ADDR] = 0x1f0,
+ [IPROC_PCIE_CFG_IND_DATA] = 0x1f4,
+ [IPROC_PCIE_CFG_ADDR] = 0x1f8,
+ [IPROC_PCIE_CFG_DATA] = 0x1fc,
+ [IPROC_PCIE_INTX_EN] = IPROC_PCIE_REG_INVALID,
+ [IPROC_PCIE_OARR_LO] = IPROC_PCIE_REG_INVALID,
+ [IPROC_PCIE_OARR_HI] = IPROC_PCIE_REG_INVALID,
+ [IPROC_PCIE_OMAP_LO] = IPROC_PCIE_REG_INVALID,
+ [IPROC_PCIE_OMAP_HI] = IPROC_PCIE_REG_INVALID,
+ [IPROC_PCIE_LINK_STATUS] = IPROC_PCIE_REG_INVALID,
+};
static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
{
@@ -91,6 +125,65 @@ static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
return pcie;
}
+static inline bool iproc_pcie_reg_is_invalid(u16 reg_offset)
+{
+ return !!(reg_offset == IPROC_PCIE_REG_INVALID);
+}
+
+static inline u16 iproc_pcie_reg_offset(struct iproc_pcie *pcie,
+ enum iproc_pcie_reg reg)
+{
+ return pcie->reg_offsets[reg];
+}
+
+static inline u32 iproc_pcie_read_reg(struct iproc_pcie *pcie,
+ enum iproc_pcie_reg reg)
+{
+ u16 offset = iproc_pcie_reg_offset(pcie, reg);
+
+ if (iproc_pcie_reg_is_invalid(offset))
+ return 0;
+
+ return readl(pcie->base + offset);
+}
+
+static inline void iproc_pcie_write_reg(struct iproc_pcie *pcie,
+ enum iproc_pcie_reg reg, u32 val)
+{
+ u16 offset = iproc_pcie_reg_offset(pcie, reg);
+
+ if (iproc_pcie_reg_is_invalid(offset))
+ return;
+
+ writel(val, pcie->base + offset);
+}
+
+static inline void iproc_pcie_ob_write(struct iproc_pcie *pcie,
+ enum iproc_pcie_reg reg,
+ unsigned window, u32 val)
+{
+ u16 offset = iproc_pcie_reg_offset(pcie, reg);
+
+ if (iproc_pcie_reg_is_invalid(offset))
+ return;
+
+ writel(val, pcie->base + offset + (window * 8));
+}
+
+static inline bool iproc_pcie_device_is_valid(struct iproc_pcie *pcie,
+ unsigned int slot,
+ unsigned int fn)
+{
+ if (slot > 0)
+ return false;
+
+ /* PAXC can only support limited number of functions */
+ if (pcie->type == IPROC_PCIE_PAXC && fn >= MAX_NUM_PAXC_PF)
+ return false;
+
+ return true;
+}
+
/**
* Note access to the configuration registers are protected at the higher layer
* by 'pci_lock' in drivers/pci/access.c
@@ -104,28 +197,34 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus,
unsigned fn = PCI_FUNC(devfn);
unsigned busno = bus->number;
u32 val;
+ u16 offset;
+
+ if (!iproc_pcie_device_is_valid(pcie, slot, fn))
+ return NULL;
/* root complex access */
if (busno == 0) {
- if (slot >= 1)
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_IND_ADDR,
+ where & CFG_IND_ADDR_MASK);
+ offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_IND_DATA);
+ if (iproc_pcie_reg_is_invalid(offset))
return NULL;
- writel(where & CFG_IND_ADDR_MASK,
- pcie->base + CFG_IND_ADDR_OFFSET);
- return (pcie->base + CFG_IND_DATA_OFFSET);
+ else
+ return (pcie->base + offset);
}
- if (fn > 1)
- return NULL;
-
/* EP device access */
val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
(slot << CFG_ADDR_DEV_NUM_SHIFT) |
(fn << CFG_ADDR_FUNC_NUM_SHIFT) |
(where & CFG_ADDR_REG_NUM_MASK) |
(1 & CFG_ADDR_CFG_TYPE_MASK);
- writel(val, pcie->base + CFG_ADDR_OFFSET);
-
- return (pcie->base + CFG_DATA_OFFSET);
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val);
+ offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA);
+ if (iproc_pcie_reg_is_invalid(offset))
+ return NULL;
+ else
+ return (pcie->base + offset);
}
static struct pci_ops iproc_pcie_ops = {
@@ -138,18 +237,29 @@ static void iproc_pcie_reset(struct iproc_pcie *pcie)
{
u32 val;
+ if (pcie->type == IPROC_PCIE_PAXC) {
+ val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL);
+ val &= ~PAXC_RESET_MASK;
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
+ udelay(100);
+ val |= PAXC_RESET_MASK;
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
+ udelay(100);
+ return;
+ }
+
/*
* Select perst_b signal as reset source. Put the device into reset,
* and then bring it out of reset
*/
- val = readl(pcie->base + CLK_CONTROL_OFFSET);
+ val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL);
val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST &
~RC_PCIE_RST_OUTPUT;
- writel(val, pcie->base + CLK_CONTROL_OFFSET);
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
udelay(250);
val |= RC_PCIE_RST_OUTPUT;
- writel(val, pcie->base + CLK_CONTROL_OFFSET);
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
msleep(100);
}
@@ -160,7 +270,14 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
u16 pos, link_status;
bool link_is_active = false;
- val = readl(pcie->base + PCIE_LINK_STATUS_OFFSET);
+ /*
+ * PAXC connects to emulated endpoint devices directly and does not
+ * have a Serdes. Therefore skip the link detection logic here.
+ */
+ if (pcie->type == IPROC_PCIE_PAXC)
+ return 0;
+
+ val = iproc_pcie_read_reg(pcie, IPROC_PCIE_LINK_STATUS);
if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) {
dev_err(pcie->dev, "PHY or data link is INACTIVE!\n");
return -ENODEV;
@@ -221,7 +338,7 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
static void iproc_pcie_enable(struct iproc_pcie *pcie)
{
- writel(SYS_RC_INTX_MASK, pcie->base + SYS_RC_INTX_EN);
+ iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
}
/**
@@ -245,7 +362,7 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
if (size > max_size) {
dev_err(pcie->dev,
- "res size 0x%pap exceeds max supported size 0x%llx\n",
+ "res size %pap exceeds max supported size 0x%llx\n",
&size, max_size);
return -EINVAL;
}
@@ -272,11 +389,15 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
axi_addr -= ob->axi_offset;
for (i = 0; i < MAX_NUM_OB_WINDOWS; i++) {
- writel(lower_32_bits(axi_addr) | OARR_VALID |
- (ob->set_oarr_size ? 1 : 0), pcie->base + OARR_LO(i));
- writel(upper_32_bits(axi_addr), pcie->base + OARR_HI(i));
- writel(lower_32_bits(pci_addr), pcie->base + OMAP_LO(i));
- writel(upper_32_bits(pci_addr), pcie->base + OMAP_HI(i));
+ iproc_pcie_ob_write(pcie, IPROC_PCIE_OARR_LO, i,
+ lower_32_bits(axi_addr) | OARR_VALID |
+ (ob->set_oarr_size ? 1 : 0));
+ iproc_pcie_ob_write(pcie, IPROC_PCIE_OARR_HI, i,
+ upper_32_bits(axi_addr));
+ iproc_pcie_ob_write(pcie, IPROC_PCIE_OMAP_LO, i,
+ lower_32_bits(pci_addr));
+ iproc_pcie_ob_write(pcie, IPROC_PCIE_OMAP_HI, i,
+ upper_32_bits(pci_addr));
size -= ob->window_size;
if (size == 0)
@@ -319,6 +440,26 @@ static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
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;
@@ -340,6 +481,19 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
goto err_exit_phy;
}
+ switch (pcie->type) {
+ case IPROC_PCIE_PAXB:
+ pcie->reg_offsets = iproc_pcie_reg_paxb;
+ break;
+ case IPROC_PCIE_PAXC:
+ pcie->reg_offsets = iproc_pcie_reg_paxc;
+ break;
+ default:
+ dev_err(pcie->dev, "incompatible iProc PCIe interface\n");
+ ret = -EINVAL;
+ goto err_power_off_phy;
+ }
+
iproc_pcie_reset(pcie);
if (pcie->need_ob_cfg) {
@@ -373,6 +527,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
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);
@@ -397,6 +555,8 @@ int iproc_pcie_remove(struct iproc_pcie *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);
diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index d3dc940f773a..e84d93c53c7b 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -15,6 +15,20 @@
#define _PCIE_IPROC_H
/**
+ * iProc PCIe interface type
+ *
+ * PAXB is the wrapper used in root complex that can be connected to an
+ * external endpoint device.
+ *
+ * PAXC is the wrapper used in root complex dedicated for internal emulated
+ * endpoint devices.
+ */
+enum iproc_pcie_type {
+ IPROC_PCIE_PAXB = 0,
+ IPROC_PCIE_PAXC,
+};
+
+/**
* iProc PCIe outbound mapping
* @set_oarr_size: indicates the OARR size bit needs to be set
* @axi_offset: offset from the AXI address to the internal address used by
@@ -27,21 +41,30 @@ struct iproc_pcie_ob {
resource_size_t window_size;
};
+struct iproc_msi;
+
/**
* iProc PCIe device
+ *
* @dev: pointer to device data structure
+ * @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
@@ -50,9 +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 */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-26 23:21:36 +0300