[PATCH 1/4] ARM: cns3xxx: Add support for PCI Express ports
Anton Vorontsov
cbouatmailru at gmail.com
Tue Jun 1 12:55:02 EDT 2010
This patch adds PCIe support for CNS3xxx-based boards. The support
was tested with a directly attached SKY2 NIC, and EHCI USB controller
behind the PLX PEX8112 P2P bridge (to make sure that type1 cfg cycles
work as expected).
Signed-off-by: Anton Vorontsov <avorontsov at mvista.com>
---
arch/arm/Kconfig | 3 +-
arch/arm/mach-cns3xxx/Makefile | 1 +
arch/arm/mach-cns3xxx/core.c | 30 ++++
arch/arm/mach-cns3xxx/pcie.c | 352 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 385 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-cns3xxx/pcie.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1f254bd..fab2ddd 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -301,6 +301,7 @@ config ARCH_CNS3XXX
select CPU_V6
select GENERIC_CLOCKEVENTS
select ARM_GIC
+ select PCI_DOMAINS if PCI
help
Support for Cavium Networks CNS3XXX platform.
@@ -1059,7 +1060,7 @@ config ISA_DMA_API
bool
config PCI
- bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
+ bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE || ARCH_CNS3XXX
help
Find out whether you have a PCI motherboard. PCI is the name of a
bus system, i.e. the way the CPU talks to the other stuff inside
diff --git a/arch/arm/mach-cns3xxx/Makefile b/arch/arm/mach-cns3xxx/Makefile
index 427507a..683f117 100644
--- a/arch/arm/mach-cns3xxx/Makefile
+++ b/arch/arm/mach-cns3xxx/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_ARCH_CNS3XXX) += core.o pm.o
+obj-$(CONFIG_PCI) += pcie.o
obj-$(CONFIG_MACH_CNS3420VB) += cns3420vb.o
diff --git a/arch/arm/mach-cns3xxx/core.c b/arch/arm/mach-cns3xxx/core.c
index 9ca4d58..2850a4b 100644
--- a/arch/arm/mach-cns3xxx/core.c
+++ b/arch/arm/mach-cns3xxx/core.c
@@ -60,6 +60,36 @@ static struct map_desc cns3xxx_io_desc[] __initdata = {
.pfn = __phys_to_pfn(CNS3XXX_PM_BASE),
.length = SZ_4K,
.type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE0_HOST_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE0_HOST_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE0_CFG0_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG0_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE0_CFG1_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG1_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE1_HOST_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE1_HOST_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE1_CFG0_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG0_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
+ }, {
+ .virtual = CNS3XXX_PCIE1_CFG1_BASE_VIRT,
+ .pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG1_BASE),
+ .length = SZ_16M,
+ .type = MT_DEVICE,
},
};
diff --git a/arch/arm/mach-cns3xxx/pcie.c b/arch/arm/mach-cns3xxx/pcie.c
new file mode 100644
index 0000000..324aa5d
--- /dev/null
+++ b/arch/arm/mach-cns3xxx/pcie.c
@@ -0,0 +1,352 @@
+/*
+ * PCI-E support for CNS3xxx
+ *
+ * Copyright 2008 Cavium Networks
+ * Richard Liu <richard.liu at caviumnetworks.com>
+ * Copyright 2010 MontaVista Software, LLC.
+ * Anton Vorontsov <avorontsov at mvista.com>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/bug.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <mach/cns3xxx.h>
+#include "core.h"
+
+enum cns3xxx_access_type {
+ CNS3XXX_HOST_TYPE = 0,
+ CNS3XXX_CFG0_TYPE,
+ CNS3XXX_CFG1_TYPE,
+ CNS3XXX_NUM_ACCESS_TYPES,
+};
+
+struct cns3xxx_pcie {
+ u32 cfg_bases[CNS3XXX_NUM_ACCESS_TYPES];
+ unsigned int irqs[2];
+ struct resource res_io;
+ struct resource res_mem;
+ struct hw_pci hw_pci;
+
+ bool linked;
+};
+
+static struct cns3xxx_pcie cns3xxx_pcie[];
+
+static struct cns3xxx_pcie *sysdata_to_cnspci(void *sysdata)
+{
+ struct pci_sys_data *root = sysdata;
+
+ return &cns3xxx_pcie[root->domain];
+}
+
+static struct cns3xxx_pcie *pdev_to_cnspci(struct pci_dev *dev)
+{
+ return sysdata_to_cnspci(dev->sysdata);
+}
+
+static struct cns3xxx_pcie *pbus_to_cnspci(struct pci_bus *bus)
+{
+ return sysdata_to_cnspci(bus->sysdata);
+}
+
+static void __iomem *cns3xxx_pci_cfg_base(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct cns3xxx_pcie *cnspci = pbus_to_cnspci(bus);
+ int busno = bus->number;
+ int slot = PCI_SLOT(devfn);
+ int offset;
+ enum cns3xxx_access_type type;
+ void __iomem *base;
+
+ /* If there is no link, just show the CNS PCI bridge. */
+ if (!cnspci->linked && (busno > 0 || slot > 0))
+ return NULL;
+
+ /*
+ * The CNS PCI bridge doesn't fit into the PCI hierarchy, though
+ * we still want to access it. For this to work, we must place
+ * the first device on the same bus as the CNS PCI bridge.
+ */
+ if (busno == 0) {
+ if (slot > 1)
+ return NULL;
+ type = slot;
+ } else {
+ type = CNS3XXX_CFG1_TYPE;
+ }
+
+ base = __io(cnspci->cfg_bases[type]);
+ offset = ((busno & 0xf) << 20) | (devfn << 12) | (where & 0xffc);
+
+ return base + offset;
+}
+
+static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ u32 v;
+ void __iomem *base;
+ u32 mask = (0x1ull << (size * 8)) - 1;
+ int shift = (where % 4) * 8;
+
+ base = cns3xxx_pci_cfg_base(bus, devfn, where);
+ if (!base) {
+ *val = 0xffffffff;
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ v = (__raw_readl(base) >> shift) & mask;
+
+ if (bus->number == 0 && devfn == 0 && size == 4 && where == 0x8) {
+ /*
+ * RC's class is 0xb, but Linux PCI driver needs 0x604
+ * for a PCIe bridge. So we must fixup the class code
+ * to 0x604 here.
+ */
+ v &= 0xff;
+ v |= 0x604 << 16;
+ }
+
+ *val = v;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int cns3xxx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ u32 v;
+ void __iomem *base;
+ u32 mask = (0x1ull << (size * 8)) - 1;
+ int shift = (where % 4) * 8;
+
+ base = cns3xxx_pci_cfg_base(bus, devfn, where);
+ if (!base)
+ return PCIBIOS_SUCCESSFUL;
+
+ v = __raw_readl(base);
+
+ v &= ~(mask << shift);
+ v |= (val & mask) << shift;
+
+ __raw_writel(v, base);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int cns3xxx_pci_setup(int nr, struct pci_sys_data *sys)
+{
+ struct cns3xxx_pcie *cnspci = sysdata_to_cnspci(sys);
+ struct resource *res_io = &cnspci->res_io;
+ struct resource *res_mem = &cnspci->res_mem;
+ struct resource **sysres = sys->resource;
+
+ BUG_ON(request_resource(&iomem_resource, res_io) ||
+ request_resource(&iomem_resource, res_mem));
+
+ sysres[0] = res_io;
+ sysres[1] = res_mem;
+
+ return 1;
+}
+
+static struct pci_ops cns3xxx_pcie_ops = {
+ .read = cns3xxx_pci_read_config,
+ .write = cns3xxx_pci_write_config,
+};
+
+static struct pci_bus *cns3xxx_pci_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ return pci_scan_bus(sys->busnr, &cns3xxx_pcie_ops, sys);
+}
+
+static int cns3xxx_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ struct cns3xxx_pcie *cnspci = pdev_to_cnspci(dev);
+ int irq = cnspci->irqs[slot];
+
+ pr_info("PCIe0 map irq: %04d:%02x:%02x.%02x slot %d, pin %d, irq: %d\n",
+ pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn),
+ PCI_FUNC(dev->devfn), slot, pin, irq);
+
+ return irq;
+}
+
+static struct cns3xxx_pcie cns3xxx_pcie[2] = {
+ [0] = {
+ .cfg_bases = {
+ [CNS3XXX_HOST_TYPE] = CNS3XXX_PCIE0_HOST_BASE_VIRT,
+ [CNS3XXX_CFG0_TYPE] = CNS3XXX_PCIE0_CFG0_BASE_VIRT,
+ [CNS3XXX_CFG1_TYPE] = CNS3XXX_PCIE0_CFG1_BASE_VIRT,
+ },
+ .irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, },
+ .res_io = {
+ .name = "PCIe0 I/O space",
+ .start = CNS3XXX_PCIE0_IO_BASE,
+ .end = CNS3XXX_PCIE0_IO_BASE + SZ_16M - 1,
+ .flags = IORESOURCE_IO,
+ },
+ .res_mem = {
+ .name = "PCIe0 non-prefetchable",
+ .start = CNS3XXX_PCIE0_MEM_BASE,
+ .end = CNS3XXX_PCIE0_MEM_BASE + SZ_16M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .hw_pci = {
+ .domain = 0,
+ .swizzle = pci_std_swizzle,
+ .nr_controllers = 1,
+ .setup = cns3xxx_pci_setup,
+ .scan = cns3xxx_pci_scan_bus,
+ .map_irq = cns3xxx_pcie_map_irq,
+ },
+ },
+ [1] = {
+ .cfg_bases = {
+ [CNS3XXX_HOST_TYPE] = CNS3XXX_PCIE1_HOST_BASE_VIRT,
+ [CNS3XXX_CFG0_TYPE] = CNS3XXX_PCIE1_CFG0_BASE_VIRT,
+ [CNS3XXX_CFG1_TYPE] = CNS3XXX_PCIE1_CFG1_BASE_VIRT,
+ },
+ .irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, },
+ .res_io = {
+ .name = "PCIe1 I/O space",
+ .start = CNS3XXX_PCIE1_IO_BASE,
+ .end = CNS3XXX_PCIE1_IO_BASE + SZ_16M - 1,
+ .flags = IORESOURCE_IO,
+ },
+ .res_mem = {
+ .name = "PCIe1 non-prefetchable",
+ .start = CNS3XXX_PCIE1_MEM_BASE,
+ .end = CNS3XXX_PCIE1_MEM_BASE + SZ_16M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .hw_pci = {
+ .domain = 1,
+ .swizzle = pci_std_swizzle,
+ .nr_controllers = 1,
+ .setup = cns3xxx_pci_setup,
+ .scan = cns3xxx_pci_scan_bus,
+ .map_irq = cns3xxx_pcie_map_irq,
+ },
+ },
+};
+
+static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
+{
+ int port = cnspci->hw_pci.domain;
+ u32 reg;
+ unsigned long time;
+
+ reg = __raw_readl(MISC_PCIE_CTRL(port));
+ /*
+ * Enable Application Request to 1, it will exit L1 automatically,
+ * but when chip back, it will use another clock, still can use 0x1.
+ */
+ reg |= 0x3;
+ __raw_writel(reg, MISC_PCIE_CTRL(port));
+
+ pr_info("PCIe: Port[%d] Enable PCIe LTSSM\n", port);
+ pr_info("PCIe: Port[%d] Check data link layer...", port);
+
+ time = jiffies;
+ while (1) {
+ reg = __raw_readl(MISC_PCIE_PM_DEBUG(port));
+ if (reg & 0x1) {
+ pr_info("Link up.\n");
+ cnspci->linked = 1;
+ break;
+ } else if (time_after(jiffies, time + 50)) {
+ pr_info("Device not found.\n");
+ break;
+ }
+ }
+}
+
+static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)
+{
+ int port = cnspci->hw_pci.domain;
+ struct pci_sys_data sd = {
+ .domain = port,
+ };
+ struct pci_bus bus = {
+ .number = 0,
+ .ops = &cns3xxx_pcie_ops,
+ .sysdata = &sd,
+ };
+ u32 io_base = cnspci->res_io.start >> 16;
+ u32 mem_base = cnspci->res_mem.start >> 16;
+ u32 host_base = (cnspci->cfg_bases[CNS3XXX_HOST_TYPE] - 1) >> 16;
+ u32 cfg0_base = (cnspci->cfg_bases[CNS3XXX_CFG0_TYPE] - 1) >> 16;
+ u32 devfn = 0;
+ u8 tmp8;
+ u16 pos;
+ u16 dc;
+
+ pci_bus_write_config_byte(&bus, devfn, PCI_PRIMARY_BUS, 0);
+ pci_bus_write_config_byte(&bus, devfn, PCI_SECONDARY_BUS, 1);
+ pci_bus_write_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, 1);
+
+ pci_bus_read_config_byte(&bus, devfn, PCI_PRIMARY_BUS, &tmp8);
+ pci_bus_read_config_byte(&bus, devfn, PCI_SECONDARY_BUS, &tmp8);
+ pci_bus_read_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, &tmp8);
+
+ pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_BASE, mem_base);
+ pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_LIMIT, host_base);
+ pci_bus_write_config_word(&bus, devfn, PCI_IO_BASE_UPPER16, io_base);
+ pci_bus_write_config_word(&bus, devfn, PCI_IO_LIMIT_UPPER16, cfg0_base);
+
+ if (!cnspci->linked)
+ return;
+
+ /* Set Device Max_Read_Request_Size to 128 byte */
+ devfn = PCI_DEVFN(1, 0);
+ pos = pci_bus_find_capability(&bus, devfn, PCI_CAP_ID_EXP);
+ pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
+ dc &= ~(0x3 << 12); /* Clear Device Control Register [14:12] */
+ pci_bus_write_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, dc);
+ pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
+ if (!(dc & (0x3 << 12)))
+ pr_info("PCIe: Set Device Max_Read_Request_Size to 128 byte\n");
+
+ /* Disable PCIe0 Interrupt Mask INTA to INTD */
+ __raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(port));
+}
+
+static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr,
+ struct pt_regs *regs)
+{
+ if (fsr & (1 << 10))
+ regs->ARM_pc += 4;
+ return 0;
+}
+
+static int __init cns3xxx_pcie_init(void)
+{
+ int i;
+
+ hook_fault_code(16 + 6, cns3xxx_pcie_abort_handler, SIGBUS,
+ "imprecise external abort");
+
+ for (i = 0; i < ARRAY_SIZE(cns3xxx_pcie); i++) {
+ cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_PCIE(i));
+ cns3xxx_pwr_soft_rst(0x1 << PM_SOFT_RST_REG_OFFST_PCIE(i));
+ cns3xxx_pcie_check_link(&cns3xxx_pcie[i]);
+ cns3xxx_pcie_hw_init(&cns3xxx_pcie[i]);
+ pci_common_init(&cns3xxx_pcie[i].hw_pci);
+ }
+
+ pci_assign_unassigned_resources();
+
+ return 0;
+}
+device_initcall(cns3xxx_pcie_init);
--
1.7.0.5
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