[PATCH 2/3] [ARM] tegra: add PCI Express support
Mike Rapoport
mike at compulab.co.il
Thu Sep 16 12:53:35 EDT 2010
Signed-off-by: Mike Rapoport <mike at compulab.co.il>
---
arch/arm/mach-tegra/Kconfig | 4 +
arch/arm/mach-tegra/Makefile | 1 +
arch/arm/mach-tegra/board.h | 1 +
arch/arm/mach-tegra/include/mach/hardware.h | 4 +
arch/arm/mach-tegra/pcie.c | 889 +++++++++++++++++++++++++++
5 files changed, 899 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-tegra/pcie.c
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index a57713c..5f09846 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -16,6 +16,10 @@ config ARCH_TEGRA_2x_SOC
endchoice
+config TEGRA_PCI
+ bool "PCI Express support"
+ select PCI
+
comment "Tegra board type"
config MACH_HARMONY
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 51e9370..23c9600 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += clock.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_clocks.o
obj-$(CONFIG_SMP) += platsmp.o localtimer.o headsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
+obj-$(CONFIG_TEGRA_PCI) += pcie.o
obj-${CONFIG_MACH_HARMONY} += board-harmony.o
obj-${CONFIG_MACH_HARMONY} += board-harmony-pinmux.o
diff --git a/arch/arm/mach-tegra/board.h b/arch/arm/mach-tegra/board.h
index 3d06354..0de565c 100644
--- a/arch/arm/mach-tegra/board.h
+++ b/arch/arm/mach-tegra/board.h
@@ -27,6 +27,7 @@ void __init tegra_common_init(void);
void __init tegra_map_common_io(void);
void __init tegra_init_irq(void);
void __init tegra_init_clock(void);
+int __init tegra_pcie_init(bool init_port0, bool init_port1);
extern struct sys_timer tegra_timer;
#endif
diff --git a/arch/arm/mach-tegra/include/mach/hardware.h b/arch/arm/mach-tegra/include/mach/hardware.h
index 6014edf..76f3478 100644
--- a/arch/arm/mach-tegra/include/mach/hardware.h
+++ b/arch/arm/mach-tegra/include/mach/hardware.h
@@ -21,4 +21,8 @@
#ifndef __MACH_TEGRA_HARDWARE_H
#define __MACH_TEGRA_HARDWARE_H
+#define PCIBIOS_MIN_IO 0
+#define PCIBIOS_MIN_MEM 0
+#define pcibios_assign_all_busses() 1
+
#endif
diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c
new file mode 100644
index 0000000..54cc034
--- /dev/null
+++ b/arch/arm/mach-tegra/pcie.c
@@ -0,0 +1,889 @@
+/*
+ * arch/arm/mach-tegra/pci.c
+ *
+ * PCIe host controller driver for TEGRA(2) SOCs
+ *
+ * Copyright (c) 2010, CompuLab, Ltd.
+ * Author: Mike Rapoport <mike at compulab.co.il>
+ *
+ * Based on NVIDIA PCIe driver
+ * Copyright (c) 2008-2009, NVIDIA Corporation.
+ *
+ * Bits taken from arch/arm/mach-dove/pcie.c
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <asm/sizes.h>
+#include <asm/mach/pci.h>
+
+#include <mach/pinmux.h>
+#include <mach/iomap.h>
+#include <mach/clk.h>
+
+/* register definitions */
+#define AFI_OFSET 0x3800
+#define PADS_OFSET 0x3000
+#define RP0_OFFSET 0x0000
+#define RP1_OFFSET 0x1000
+
+#define AFI_AXI_BAR0_SZ 0x00
+#define AFI_AXI_BAR1_SZ 0x04
+#define AFI_AXI_BAR2_SZ 0x08
+#define AFI_AXI_BAR3_SZ 0x0c
+#define AFI_AXI_BAR4_SZ 0x10
+#define AFI_AXI_BAR5_SZ 0x14
+
+#define AFI_AXI_BAR0_START 0x18
+#define AFI_AXI_BAR1_START 0x1c
+#define AFI_AXI_BAR2_START 0x20
+#define AFI_AXI_BAR3_START 0x24
+#define AFI_AXI_BAR4_START 0x28
+#define AFI_AXI_BAR5_START 0x2c
+
+#define AFI_FPCI_BAR0 0x30
+#define AFI_FPCI_BAR1 0x34
+#define AFI_FPCI_BAR2 0x38
+#define AFI_FPCI_BAR3 0x3c
+#define AFI_FPCI_BAR4 0x40
+#define AFI_FPCI_BAR5 0x44
+
+#define AFI_CACHE_BAR0_SZ 0x48
+#define AFI_CACHE_BAR0_ST 0x4c
+#define AFI_CACHE_BAR1_SZ 0x50
+#define AFI_CACHE_BAR1_ST 0x54
+
+#define AFI_MSI_BAR_SZ 0x60
+#define AFI_MSI_FPCI_BAR_ST 0x64
+#define AFI_MSI_AXI_BAR_ST 0x68
+
+#define AFI_CONFIGURATION 0xac
+#define AFI_CONFIGURATION_EN_FPCI (1 << 0)
+
+#define AFI_FPCI_ERROR_MASKS 0xb0
+
+#define AFI_INTR_MASK 0xb4
+#define AFI_INTR_MASK_INT_MASK (1 << 0)
+#define AFI_INTR_MASK_MSI_MASK (1 << 8)
+
+#define AFI_INTR_CODE 0xb8
+#define AFI_INTR_CODE_MASK 0xf
+#define AFI_INTR_MASTER_ABORT 4
+#define AFI_INTR_LEGACY 6
+
+#define AFI_INTR_SIGNATURE 0xbc
+#define AFI_SM_INTR_ENABLE 0xc4
+
+#define AFI_AFI_INTR_ENABLE 0xc8
+#define AFI_INTR_EN_INI_SLVERR (1 << 0)
+#define AFI_INTR_EN_INI_DECERR (1 << 1)
+#define AFI_INTR_EN_TGT_SLVERR (1 << 2)
+#define AFI_INTR_EN_TGT_DECERR (1 << 3)
+#define AFI_INTR_EN_TGT_WRERR (1 << 4)
+#define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
+#define AFI_INTR_EN_AXI_DECERR (1 << 6)
+#define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
+
+#define AFI_PCIE_CONFIG 0x0f8
+#define AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE (1 << 1)
+#define AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE (1 << 2)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
+
+#define AFI_FUSE 0x104
+#define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
+
+#define AFI_PEX0_CTRL 0x110
+#define AFI_PEX1_CTRL 0x118
+#define AFI_PEX_CTRL_RST (1 << 0)
+#define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
+
+#define RP_VEND_XP 0x00000F00
+#define RP_VEND_XP_DL_UP (1 << 30)
+
+#define RP_LINK_CONTROL_STATUS 0x00000090
+#define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
+
+#define PADS_CTL_SEL 0x0000009C
+
+#define PADS_CTL 0x000000A0
+#define PADS_CTL_IDDQ_1L (1 << 0)
+#define PADS_CTL_TX_DATA_EN_1L (1 << 6)
+#define PADS_CTL_RX_DATA_EN_1L (1 << 10)
+
+#define PADS_PLL_CTL 0x000000B8
+#define PADS_PLL_CTL_RST_B4SM (1 << 1)
+#define PADS_PLL_CTL_LOCKDET (1 << 8)
+#define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
+#define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
+#define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
+#define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
+#define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
+#define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
+#define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
+
+/* PMC access is required for PCIE xclk (un)clamping */
+#define PMC_SCRATCH42 0x144
+#define PMC_SCRATCH42_PCX_CLAMP (1 << 0)
+
+static void __iomem *reg_pmc_base = IO_ADDRESS(TEGRA_PMC_BASE);
+
+#define pmc_writel(value, reg) \
+ __raw_writel(value, (u32)reg_pmc_base + (reg))
+#define pmc_readl(reg) \
+ __raw_readl((u32)reg_pmc_base + (reg))
+
+/*
+ * Tegra2 defines 1GB in the AXI address map for PCIe.
+ *
+ * That address space is split into different regions, with sizes and
+ * offsets as follows:
+ *
+ * 0x80000000 - 0x80003fff - PCI controller registers
+ * 0x80004000 - 0x80103fff - PCI configuration space
+ * 0x80104000 - 0x80203fff - PCI extended configuration space
+ * 0x80203fff - 0x803fffff - unused
+ * 0x80400000 - 0x805fffff - downstream IO
+ * 0x80600000 - 0x8fffffff - unused
+ * 0x90000000 - 0x9fffffff - non-prefetchable memory
+ * 0xa0000000 - 0xbfffffff - prefetchable memory
+ */
+#define TEGRA_PCIE_BASE 0x80000000
+
+#define PCIE_REGS_SZ SZ_16K
+#define PCIE_CFG_OFF PCIE_REGS_SZ
+#define PCIE_CFG_SZ SZ_1M
+#define PCIE_EXT_CFG_OFF (PCIE_CFG_SZ + PCIE_CFG_OFF)
+#define PCIE_EXT_CFG_SZ SZ_1M
+#define PCIE_IOMAP_SZ (PCIE_REGS_SZ + PCIE_CFG_SZ + PCIE_EXT_CFG_SZ)
+
+#define IO_BASE_0 (TEGRA_PCIE_BASE + SZ_4M)
+#define IO_SIZE_0 SZ_1M
+#define IO_BASE_1 (IO_BASE_0 + SZ_1M)
+#define IO_SIZE_1 SZ_1M
+#define MEM_BASE_0 (TEGRA_PCIE_BASE + SZ_256M)
+#define MEM_SIZE_0 SZ_128M
+#define MEM_BASE_1 (MEM_BASE_0 + MEM_SIZE_0)
+#define MEM_SIZE_1 SZ_128M
+#define PREFETCH_MEM_BASE_0 (MEM_BASE_1 + MEM_SIZE_1)
+#define PREFETCH_MEM_SIZE_0 SZ_128M
+#define PREFETCH_MEM_BASE_1 (PREFETCH_MEM_BASE_0 + PREFETCH_MEM_SIZE_0)
+#define PREFETCH_MEM_SIZE_1 SZ_128M
+
+#define PCIE_CONF_BUS(b) ((b) << 16)
+#define PCIE_CONF_DEV(d) ((d) << 11)
+#define PCIE_CONF_FUNC(f) ((f) << 8)
+#define PCIE_CONF_REG(r) \
+ (((r) & ~0x3) | (((r) < 256) ? PCIE_CFG_OFF : PCIE_EXT_CFG_OFF))
+
+struct tegra_pcie_port {
+ int index;
+ u8 root_bus_nr;
+ void __iomem *base;
+
+ bool link_up;
+
+ char io_space_name[16];
+ char mem_space_name[16];
+ char prefetch_space_name[20];
+ struct resource res[3];
+};
+
+struct tegra_pcie_info {
+ struct tegra_pcie_port port[2];
+ int num_ports;
+
+ void __iomem *regs;
+
+ struct clk *pex_clk;
+ struct clk *afi_clk;
+ struct clk *pcie_xclk;
+ struct clk *pll_e;
+};
+
+static struct tegra_pcie_info tegra_pcie;
+
+static inline void afi_writel(u32 value, unsigned long offset)
+{
+ writel(value, offset + AFI_OFSET + tegra_pcie.regs);
+}
+
+static inline u32 afi_readl(unsigned long offset)
+{
+ return readl(offset + AFI_OFSET + tegra_pcie.regs);
+}
+
+static inline void pads_writel(u32 value, unsigned long offset)
+{
+ writel(value, offset + PADS_OFSET + tegra_pcie.regs);
+}
+
+static inline u32 pads_readl(unsigned long offset)
+{
+ return readl(offset + PADS_OFSET + tegra_pcie.regs);
+}
+
+static struct tegra_pcie_port *bus_to_port(int bus)
+{
+ int i;
+
+ for (i = tegra_pcie.num_ports - 1; i >= 0; i--) {
+ int rbus = tegra_pcie.port[i].root_bus_nr;
+ if (rbus != -1 && rbus == bus)
+ break;
+ }
+
+ return i >= 0 ? tegra_pcie.port + i : NULL;
+}
+
+static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ struct tegra_pcie_port *pp = bus_to_port(bus->number);
+ void __iomem *addr;
+
+ if (pp) {
+ if (devfn != 0) {
+ *val = 0xffffffff;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ addr = pp->base + (where & ~0x3);
+ } else {
+ addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) +
+ PCIE_CONF_DEV(PCI_SLOT(devfn)) +
+ PCIE_CONF_FUNC(PCI_FUNC(devfn)) +
+ PCIE_CONF_REG(where));
+ }
+
+ *val = readl(addr);
+
+ if (size == 1)
+ *val = (*val >> (8 * (where & 3))) & 0xff;
+ else if (size == 2)
+ *val = (*val >> (8 * (where & 3))) & 0xffff;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct tegra_pcie_port *pp = bus_to_port(bus->number);
+ void __iomem *addr;
+
+ u32 mask;
+ u32 tmp;
+
+ if (pp) {
+ if (devfn != 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ addr = pp->base + (where & ~0x3);
+ } else {
+ addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) +
+ PCIE_CONF_DEV(PCI_SLOT(devfn)) +
+ PCIE_CONF_FUNC(PCI_FUNC(devfn)) +
+ PCIE_CONF_REG(where));
+ }
+
+ if (size == 4) {
+ writel(val, addr);
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ if (size == 2)
+ mask = ~(0xffff << ((where & 0x3) * 8));
+ else if (size == 1)
+ mask = ~(0xff << ((where & 0x3) * 8));
+ else
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ tmp = readl(addr) & mask;
+ tmp |= val << ((where & 0x3) * 8);
+ writel(tmp, addr);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops tegra_pcie_ops = {
+ .read = tegra_pcie_read_conf,
+ .write = tegra_pcie_write_conf,
+};
+
+static void __devinit tegra_pcie_fixup_bridge(struct pci_dev *dev)
+{
+ u16 reg;
+
+ if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
+ pci_read_config_word(dev, PCI_COMMAND, ®);
+ reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+ pci_write_config_word(dev, PCI_COMMAND, reg);
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge);
+
+/* Tegra PCIE root complex wrongly reports device class */
+static void __devinit tegra_pcie_fixup_class(struct pci_dev *dev)
+{
+ dev->class = PCI_CLASS_BRIDGE_PCI << 8;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
+
+/* Tegra PCIE requires relaxed ordering */
+static void __devinit tegra_pcie_relax_enable(struct pci_dev *dev)
+{
+ u16 val16;
+ int pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+
+ if (pos <= 0) {
+ dev_err(&dev->dev, "skipping relaxed ordering fixup\n");
+ return;
+ }
+
+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &val16);
+ val16 |= PCI_EXP_DEVCTL_RELAX_EN;
+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, val16);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
+
+static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct tegra_pcie_port *pp;
+
+ if (nr >= tegra_pcie.num_ports)
+ return 0;
+
+ pp = tegra_pcie.port + nr;
+ pp->root_bus_nr = sys->busnr;
+
+ /*
+ * IORESOURCE_IO
+ */
+ snprintf(pp->io_space_name, sizeof(pp->io_space_name),
+ "PCIe %d I/O", pp->index);
+ pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
+ pp->res[0].name = pp->io_space_name;
+ if (pp->index == 0) {
+ pp->res[0].start = IO_BASE_0;
+ pp->res[0].end = pp->res[0].start + IO_SIZE_0 - 1;
+ } else {
+ pp->res[0].start = IO_BASE_1;
+ pp->res[0].end = pp->res[0].start + IO_SIZE_1 - 1;
+ }
+ pp->res[0].flags = IORESOURCE_IO;
+ if (request_resource(&ioport_resource, &pp->res[0]))
+ panic("Request PCIe IO resource failed\n");
+ sys->resource[0] = &pp->res[0];
+ sys->io_offset = pp->res[nr].start;
+
+ /*
+ * IORESOURCE_MEM
+ */
+ snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
+ "PCIe %d MEM", pp->index);
+ pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
+ pp->res[1].name = pp->mem_space_name;
+ if (pp->index == 0) {
+ pp->res[1].start = MEM_BASE_0;
+ pp->res[1].end = pp->res[1].start + MEM_SIZE_0 - 1;
+ } else {
+ pp->res[1].start = MEM_BASE_1;
+ pp->res[1].end = pp->res[1].start + MEM_SIZE_1 - 1;
+ }
+ pp->res[1].flags = IORESOURCE_MEM;
+ if (request_resource(&iomem_resource, &pp->res[1]))
+ panic("Request PCIe Memory resource failed\n");
+ sys->resource[1] = &pp->res[1];
+
+ /*
+ * IORESOURCE_MEM | IORESOURCE_PREFETCH
+ */
+ snprintf(pp->prefetch_space_name, sizeof(pp->prefetch_space_name),
+ "PCIe %d PREFETCH MEM", pp->index);
+ pp->prefetch_space_name[sizeof(pp->prefetch_space_name) - 1] = 0;
+ pp->res[2].name = pp->prefetch_space_name;
+ if (pp->index == 0) {
+ pp->res[2].start = PREFETCH_MEM_BASE_0;
+ pp->res[2].end = pp->res[2].start + PREFETCH_MEM_SIZE_0 - 1;
+ } else {
+ pp->res[2].start = PREFETCH_MEM_BASE_1;
+ pp->res[2].end = pp->res[2].start + PREFETCH_MEM_SIZE_1 - 1;
+ }
+ pp->res[2].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+ if (request_resource(&iomem_resource, &pp->res[2]))
+ panic("Request PCIe Prefetch Memory resource failed\n");
+ sys->resource[2] = &pp->res[2];
+
+ return 1;
+}
+
+static int tegra_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ return INT_PCIE_INTR;
+}
+
+static struct pci_bus __init *tegra_pcie_scan_bus(int nr,
+ struct pci_sys_data *sys)
+{
+ struct tegra_pcie_port *pp;
+
+ if (nr >= tegra_pcie.num_ports)
+ return 0;
+
+ pp = tegra_pcie.port + nr;
+ pp->root_bus_nr = sys->busnr;
+
+ return pci_scan_bus(sys->busnr, &tegra_pcie_ops, sys);
+}
+
+static struct hw_pci tegra_pcie_hw __initdata = {
+ .nr_controllers = 2,
+ .setup = tegra_pcie_setup,
+ .scan = tegra_pcie_scan_bus,
+ .swizzle = pci_std_swizzle,
+ .map_irq = tegra_pcie_map_irq,
+};
+
+
+static irqreturn_t tegra_pcie_isr(int irq, void *arg)
+{
+ const char *err_msg[] = {
+ "Unknown",
+ "AXI slave error",
+ "AXI decode error",
+ "Target abort",
+ "Master abort",
+ "Invalid write",
+ "Response decoding error",
+ "AXI response decoding error",
+ "Transcation timeout",
+ };
+
+ u32 code, signature;
+
+ code = afi_readl(AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
+ signature = afi_readl(AFI_INTR_SIGNATURE);
+ afi_writel(0, AFI_INTR_CODE);
+
+ if (code == AFI_INTR_LEGACY)
+ return IRQ_NONE;
+
+ if (code >= ARRAY_SIZE(err_msg))
+ code = 0;
+
+ /*
+ * do not pollute kernel log with master abort reports since they
+ * happen a lot during enumeration
+ */
+ if (code == AFI_INTR_MASTER_ABORT)
+ pr_debug("PCI: %s, signature: %08x\n", err_msg[code], signature);
+ else
+ pr_err("PCI: %s, signature: %08x\n", err_msg[code], signature);
+
+ return IRQ_HANDLED;
+}
+
+static void tegra_pcie_setup_translations(void)
+{
+ u32 fpci_bar;
+ u32 size;
+ u32 axi_address;
+
+ /* Bar 0: config Bar */
+ fpci_bar = ((u32)0xfdff << 16);
+ size = PCIE_CFG_SZ;
+ axi_address = TEGRA_PCIE_BASE + PCIE_CFG_OFF;
+ afi_writel(axi_address, AFI_AXI_BAR0_START);
+ afi_writel(size >> 12, AFI_AXI_BAR0_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR0);
+
+ /* Bar 1: extended config Bar */
+ fpci_bar = ((u32)0xfe1 << 20);
+ size = PCIE_EXT_CFG_SZ;
+ axi_address = TEGRA_PCIE_BASE + PCIE_EXT_CFG_OFF;
+ afi_writel(axi_address, AFI_AXI_BAR1_START);
+ afi_writel(size >> 12, AFI_AXI_BAR1_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR1);
+
+ /* Bar 2: downstream IO bar */
+ fpci_bar = ((__u32)0xfdfc << 16);
+ size = IO_SIZE_0 + IO_SIZE_1;
+ axi_address = IO_BASE_0;
+ afi_writel(axi_address, AFI_AXI_BAR2_START);
+ afi_writel(size >> 12, AFI_AXI_BAR2_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR2);
+
+ /* Bar 3: prefetchable memory BAR */
+ fpci_bar = (((PREFETCH_MEM_BASE_0 >> 12) & 0x0fffffff) << 4) | 0x1;
+ size = PREFETCH_MEM_SIZE_0 + PREFETCH_MEM_SIZE_1;
+ axi_address = PREFETCH_MEM_BASE_0;
+ afi_writel(axi_address, AFI_AXI_BAR3_START);
+ afi_writel(size >> 12, AFI_AXI_BAR3_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR3);
+
+ /* Bar 4: non prefetchable memory BAR */
+ fpci_bar = (((MEM_BASE_0 >> 12) & 0x0FFFFFFF) << 4) | 0x1;
+ size = MEM_SIZE_0 + MEM_SIZE_1;
+ axi_address = MEM_BASE_0;
+ afi_writel(axi_address, AFI_AXI_BAR4_START);
+ afi_writel(size >> 12, AFI_AXI_BAR4_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR4);
+
+ /* Bar 5: NULL out the remaining BAR as it is not used */
+ fpci_bar = 0;
+ size = 0;
+ axi_address = 0;
+ afi_writel(axi_address, AFI_AXI_BAR5_START);
+ afi_writel(size >> 12, AFI_AXI_BAR5_SZ);
+ afi_writel(fpci_bar, AFI_FPCI_BAR5);
+
+ /* map all upstream transactions as uncached */
+ afi_writel(PHYS_OFFSET, AFI_CACHE_BAR0_ST);
+ afi_writel(0, AFI_CACHE_BAR0_SZ);
+ afi_writel(0, AFI_CACHE_BAR1_ST);
+ afi_writel(0, AFI_CACHE_BAR1_SZ);
+
+ /* No MSI */
+ afi_writel(0, AFI_MSI_FPCI_BAR_ST);
+ afi_writel(0, AFI_MSI_BAR_SZ);
+ afi_writel(0, AFI_MSI_AXI_BAR_ST);
+ afi_writel(0, AFI_MSI_BAR_SZ);
+}
+
+static void tegra_pcie_enable_controller(void)
+{
+ u32 val, reg;
+ int i;
+
+ /* Enable slot clock and pulse the reset signals */
+ for (i = 0, reg = AFI_PEX0_CTRL; i < 2; i++, reg += 0x8) {
+ val = afi_readl(reg) | AFI_PEX_CTRL_REFCLK_EN;
+ afi_writel(val, reg);
+ val &= ~AFI_PEX_CTRL_RST;
+ afi_writel(val, reg);
+
+ val = afi_readl(reg) | AFI_PEX_CTRL_RST;
+ afi_writel(val, reg);
+ }
+
+ /* Enable dual controller and both ports */
+ val = afi_readl(AFI_PCIE_CONFIG);
+ val &= ~(AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE |
+ AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE |
+ AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK);
+ val |= AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
+ afi_writel(val, AFI_PCIE_CONFIG);
+
+ val = afi_readl(AFI_FUSE) & ~AFI_FUSE_PCIE_T0_GEN2_DIS;
+ afi_writel(val, AFI_FUSE);
+
+ /* Initialze internal PHY, enable up to 16 PCIE lanes */
+ pads_writel(0x0, PADS_CTL_SEL);
+
+ /* override IDDQ to 1 on all 4 lanes */
+ val = pads_readl(PADS_CTL) | PADS_CTL_IDDQ_1L;
+ pads_writel(val, PADS_CTL);
+
+ /*
+ * set up PHY PLL inputs select PLLE output as refclock,
+ * set TX ref sel to div10 (not div5)
+ */
+ val = pads_readl(PADS_PLL_CTL);
+ val &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
+ val |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10);
+ pads_writel(val, PADS_PLL_CTL);
+
+ /* take PLL out of reset */
+ val = pads_readl(PADS_PLL_CTL) | PADS_PLL_CTL_RST_B4SM;
+ pads_writel(val, PADS_PLL_CTL);
+
+ /*
+ * Hack, set the clock voltage to the DEFAULT provided by hw folks.
+ * This doesn't exist in the documentation
+ */
+ pads_writel(0xfa5cfa5c, 0xc8);
+
+ /* Wait for the PLL to lock */
+ do {
+ val = pads_readl(PADS_PLL_CTL);
+ } while (!(val & PADS_PLL_CTL_LOCKDET));
+
+ /* turn off IDDQ override */
+ val = pads_readl(PADS_CTL) & ~PADS_CTL_IDDQ_1L;
+ pads_writel(val, PADS_CTL);
+
+ /* enable TX/RX data */
+ val = pads_readl(PADS_CTL);
+ val |= (PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L);
+ pads_writel(val, PADS_CTL);
+
+ /* Take the PCIe interface module out of reset */
+ tegra_periph_reset_deassert(tegra_pcie.pcie_xclk);
+
+ /* Finally enable PCIe */
+ val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_EN_FPCI;
+ afi_writel(val, AFI_CONFIGURATION);
+
+ val = (AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
+ AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
+ AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR);
+ afi_writel(val, AFI_AFI_INTR_ENABLE);
+ afi_writel(0xffffffff, AFI_SM_INTR_ENABLE);
+
+ /* FIXME: No MSI for now, only INT */
+ afi_writel(AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
+
+ /* Disable all execptions */
+ afi_writel(0, AFI_FPCI_ERROR_MASKS);
+
+ return;
+}
+
+static void tegra_pcie_xclk_clamp(bool clamp)
+{
+ u32 reg;
+
+ reg = pmc_readl(PMC_SCRATCH42) & ~PMC_SCRATCH42_PCX_CLAMP;
+
+ if (clamp)
+ reg |= PMC_SCRATCH42_PCX_CLAMP;
+
+ pmc_writel(reg, PMC_SCRATCH42);
+}
+
+static int tegra_pcie_power_on(void)
+{
+ int err;
+
+ tegra_pcie_xclk_clamp(true);
+ tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
+ tegra_pcie_xclk_clamp(false);
+
+ clk_enable(tegra_pcie.afi_clk);
+ clk_enable(tegra_pcie.pex_clk);
+ return clk_enable(tegra_pcie.pll_e);
+}
+
+static void tegra_pcie_power_off(void)
+{
+ tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
+ tegra_periph_reset_assert(tegra_pcie.afi_clk);
+ tegra_periph_reset_assert(tegra_pcie.pex_clk);
+
+ tegra_pcie_xclk_clamp(true);
+}
+
+static int tegra_pcie_clocks_get(void)
+{
+ int err;
+
+ tegra_pcie.pex_clk = clk_get_sys(NULL, "pex");
+ if (IS_ERR(tegra_pcie.pex_clk))
+ return PTR_ERR(tegra_pcie.pex_clk);
+
+ tegra_pcie.afi_clk = clk_get_sys(NULL, "afi");
+ if (IS_ERR(tegra_pcie.afi_clk)) {
+ err = PTR_ERR(tegra_pcie.afi_clk);
+ goto err_afi_clk;
+ }
+
+ tegra_pcie.pcie_xclk = clk_get_sys(NULL, "pcie_xclk");
+ if (IS_ERR(tegra_pcie.pcie_xclk)) {
+ err = PTR_ERR(tegra_pcie.pcie_xclk);
+ goto err_pcie_xclk;
+ }
+
+ tegra_pcie.pll_e = clk_get_sys(NULL, "pll_e");
+ if (IS_ERR(tegra_pcie.pll_e)) {
+ err = PTR_ERR(tegra_pcie.pll_e);
+ goto err_pll_e;
+ }
+
+ return 0;
+
+err_pll_e:
+ clk_put(tegra_pcie.pcie_xclk);
+err_pcie_xclk:
+ clk_put(tegra_pcie.afi_clk);
+err_afi_clk:
+ clk_put(tegra_pcie.pex_clk);
+
+ return err;
+}
+
+static void tegra_pcie_clocks_put(void)
+{
+ clk_put(tegra_pcie.pll_e);
+ clk_put(tegra_pcie.pcie_xclk);
+ clk_put(tegra_pcie.afi_clk);
+ clk_put(tegra_pcie.pex_clk);
+}
+
+static int __init tegra_pcie_get_resources(void)
+{
+ int err;
+
+ err = tegra_pcie_clocks_get();
+ if (err) {
+ pr_err("%s: tegra_pcie_clocks_get: %d\n", __func__, err);
+ return err;
+ }
+
+ err = tegra_pcie_power_on();
+ if (err) {
+ pr_err("%s: tegra_pcie_power_on: %d\n", __func__, err);
+ goto err_pwr_on;
+ }
+
+ tegra_pcie.regs = ioremap_nocache(TEGRA_PCIE_BASE, PCIE_IOMAP_SZ);
+ if (tegra_pcie.regs == NULL) {
+ pr_err("tegra_pcie_setup: Failed to map the PCI/AFI regs\n");
+ goto err_reg_map;
+ }
+
+ err = request_irq(INT_PCIE_INTR, tegra_pcie_isr,
+ IRQF_SHARED, "PCIE", &tegra_pcie);
+ if (err) {
+ pr_err("tegra_pcie_setup: Cannot register the IRQ\n");
+ goto err_irq;
+ }
+ set_irq_flags(INT_PCIE_INTR, IRQF_VALID);
+
+ return 0;
+
+err_irq:
+ iounmap(tegra_pcie.regs);
+err_reg_map:
+ tegra_pcie_power_off();
+err_pwr_on:
+ tegra_pcie_clocks_put();
+
+ return err;
+}
+
+/*
+ * FIXME: If there are no PCIe cards attached, then calling this function
+ * can result in the increase of the bootup time as there are big timeout
+ * loops.
+ */
+#define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
+static bool tegra_pcie_check_link(struct tegra_pcie_port *pp, int idx,
+ u32 reset_reg)
+{
+ u32 reg;
+ int retries = 3;
+ int timeout;
+
+ do {
+ timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
+ while (timeout) {
+ reg = readl(pp->base + RP_VEND_XP);
+
+ if (reg & RP_VEND_XP_DL_UP)
+ break;
+
+ mdelay(1);
+ timeout--;
+ }
+
+ if (!timeout) {
+ pr_err("PCIE: port %d: link down, retrying\n", idx);
+ goto retry;
+ }
+
+ timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
+ while (timeout) {
+ reg = readl(pp->base + RP_LINK_CONTROL_STATUS);
+
+ if (reg & 0x20000000)
+ return true;
+
+ mdelay(1);
+ timeout--;
+ }
+
+retry:
+ /* Pulse the PEX reset */
+ reg = afi_readl(reset_reg) | AFI_PEX_CTRL_RST;
+ afi_writel(reg, reset_reg);
+ mdelay(1);
+ reg = afi_readl(reset_reg) & ~AFI_PEX_CTRL_RST;
+ afi_writel(reg, reset_reg);
+
+ retries--;
+ } while (retries);
+
+ return false;
+}
+
+static void __init tegra_pcie_add_port(int index, u32 offset, u32 reset_reg)
+{
+ struct tegra_pcie_port *pp;
+
+ pp = tegra_pcie.port + tegra_pcie.num_ports;
+
+ pp->index = -1;
+ pp->base = tegra_pcie.regs + offset;
+ pp->link_up = tegra_pcie_check_link(pp, index, reset_reg);
+
+ if (!pp->link_up) {
+ pp->base = NULL;
+ printk(KERN_INFO "PCIE: port %d: link down, ignoring\n", index);
+ return;
+ }
+
+ tegra_pcie.num_ports++;
+ pp->index = index;
+ pp->root_bus_nr = -1;
+ memset(pp->res, 0, sizeof(pp->res));
+}
+
+int __init tegra_pcie_init(bool init_port0, bool init_port1)
+{
+ int err;
+
+ if (!(init_port0 || init_port1))
+ return -ENODEV;
+
+ err = tegra_pcie_get_resources();
+ if (err)
+ return err;
+
+ tegra_pcie_enable_controller();
+
+ /* setup the AFI address translations */
+ tegra_pcie_setup_translations();
+
+ if (init_port0)
+ tegra_pcie_add_port(0, RP0_OFFSET, AFI_PEX0_CTRL);
+
+ if (init_port1)
+ tegra_pcie_add_port(1, RP1_OFFSET, AFI_PEX1_CTRL);
+
+ pci_common_init(&tegra_pcie_hw);
+
+ return 0;
+}
--
1.6.6.2
More information about the linux-arm-kernel
mailing list