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Commit d1523b52 authored by Thierry Reding's avatar Thierry Reding Committed by Stephen Warren
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PCI: tegra: Move PCIe driver to drivers/pci/host 

Move the PCIe driver from arch/arm/mach-tegra into the drivers/pci/host
directory. The motivation is to collect various host controller drivers
in the same location in order to facilitate refactoring.

The Tegra PCIe driver has been largely rewritten, both in order to turn
it into a proper platform driver and to add MSI (based on code by
Krishna Kishore <kthota@nvidia.com>) as well as device tree support.
Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
[swarren, split DT changes into a separate patch in another branch]
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent 734a0f6b
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Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt 0 → 100644
View file @ d1523b52
NVIDIA Tegra PCIe controller
Required properties:
- compatible: "nvidia,tegra20-pcie"
- device_type: Must be "pci"
- reg: A list of physical base address and length for each set of controller
registers. Must contain an entry for each entry in the reg-names property.
- reg-names: Must include the following entries:
"pads": PADS registers
"afi": AFI registers
"cs": configuration space region
- interrupts: A list of interrupt outputs of the controller. Must contain an
entry for each entry in the interrupt-names property.
- interrupt-names: Must include the following entries:
"intr": The Tegra interrupt that is asserted for controller interrupts
"msi": The Tegra interrupt that is asserted when an MSI is received
- pex-clk-supply: Supply voltage for internal reference clock
- vdd-supply: Power supply for controller (1.05V)
- bus-range: Range of bus numbers associated with this controller
- #address-cells: Address representation for root ports (must be 3)
- cell 0 specifies the bus and device numbers of the root port:
[23:16]: bus number
[15:11]: device number
- cell 1 denotes the upper 32 address bits and should be 0
- cell 2 contains the lower 32 address bits and is used to translate to the
CPU address space
- #size-cells: Size representation for root ports (must be 2)
- ranges: Describes the translation of addresses for root ports and standard
PCI regions. The entries must be 6 cells each, where the first three cells
correspond to the address as described for the #address-cells property
above, the fourth cell is the physical CPU address to translate to and the
fifth and six cells are as described for the #size-cells property above.
- The first two entries are expected to translate the addresses for the root
port registers, which are referenced by the assigned-addresses property of
the root port nodes (see below).
- The remaining entries setup the mapping for the standard I/O, memory and
prefetchable PCI regions. The first cell determines the type of region
that is setup:
- 0x81000000: I/O memory region
- 0x82000000: non-prefetchable memory region
- 0xc2000000: prefetchable memory region
Please refer to the standard PCI bus binding document for a more detailed
explanation.
- clocks: List of clock inputs of the controller. Must contain an entry for
each entry in the clock-names property.
- clock-names: Must include the following entries:
"pex": The Tegra clock of that name
"afi": The Tegra clock of that name
"pcie_xclk": The Tegra clock of that name
"pll_e": The Tegra clock of that name
Root ports are defined as subnodes of the PCIe controller node.
Required properties:
- device_type: Must be "pci"
- assigned-addresses: Address and size of the port configuration registers
- reg: PCI bus address of the root port
- #address-cells: Must be 3
- #size-cells: Must be 2
- ranges: Sub-ranges distributed from the PCIe controller node. An empty
property is sufficient.
- nvidia,num-lanes: Number of lanes to use for this port. Valid combinations
are:
- Root port 0 uses 4 lanes, root port 1 is unused.
- Both root ports use 2 lanes.
Example:
SoC DTSI:
pcie-controller {
compatible = "nvidia,tegra20-pcie";
device_type = "pci";
reg = <0x80003000 0x00000800 /* PADS registers */
0x80003800 0x00000200 /* AFI registers */
0x90000000 0x10000000>; /* configuration space */
reg-names = "pads", "afi", "cs";
interrupts = <0 98 0x04 /* controller interrupt */
0 99 0x04>; /* MSI interrupt */
interrupt-names = "intr", "msi";
bus-range = <0x00 0xff>;
#address-cells = <3>;
#size-cells = <2>;
ranges = <0x82000000 0 0x80000000 0x80000000 0 0x00001000 /* port 0 registers */
0x82000000 0 0x80001000 0x80001000 0 0x00001000 /* port 1 registers */
0x81000000 0 0 0x82000000 0 0x00010000 /* downstream I/O */
0x82000000 0 0xa0000000 0xa0000000 0 0x10000000 /* non-prefetchable memory */
0xc2000000 0 0xb0000000 0xb0000000 0 0x10000000>; /* prefetchable memory */
clocks = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 74>,
<&tegra_car 118>;
clock-names = "pex", "afi", "pcie_xclk", "pll_e";
status = "disabled";
pci@1,0 {
device_type = "pci";
assigned-addresses = <0x82000800 0 0x80000000 0 0x1000>;
reg = <0x000800 0 0 0 0>;
status = "disabled";
#address-cells = <3>;
#size-cells = <2>;
ranges;
nvidia,num-lanes = <2>;
};
pci@2,0 {
device_type = "pci";
assigned-addresses = <0x82001000 0 0x80001000 0 0x1000>;
reg = <0x001000 0 0 0 0>;
status = "disabled";
#address-cells = <3>;
#size-cells = <2>;
ranges;
nvidia,num-lanes = <2>;
};
};
Board DTS:
pcie-controller {
status = "okay";
vdd-supply = <&pci_vdd_reg>;
pex-clk-supply = <&pci_clk_reg>;
/* root port 00:01.0 */
pci@1,0 {
status = "okay";
/* bridge 01:00.0 (optional) */
pci@0,0 {
reg = <0x010000 0 0 0 0>;
#address-cells = <3>;
#size-cells = <2>;
device_type = "pci";
/* endpoint 02:00.0 */
pci@0,0 {
reg = <0x020000 0 0 0 0>;
};
};
};
};
Note that devices on the PCI bus are dynamically discovered using PCI's bus
enumeration and therefore don't need corresponding device nodes in DT. However
if a device on the PCI bus provides a non-probeable bus such as I2C or SPI,
device nodes need to be added in order to allow the bus' children to be
instantiated at the proper location in the operating system's device tree (as
illustrated by the optional nodes in the example above).
arch/arm/mach-tegra/Kconfig
View file @ d1523b52
......@@ -21,6 +21,8 @@ config ARCH_TEGRA
select USB_ULPI if USB_PHY
select USB_ULPI_VIEWPORT if USB_PHY
select USE_OF
select MIGHT_HAVE_PCI
select ARCH_SUPPORTS_MSI
help
This enables support for NVIDIA Tegra based systems.
......@@ -60,11 +62,6 @@ config ARCH_TEGRA_114_SOC
Support for NVIDIA Tegra T114 processor family, based on the
ARM CortexA15MP CPU
config TEGRA_PCI
bool "PCI Express support"
depends on ARCH_TEGRA_2x_SOC
select PCI
config TEGRA_AHB
bool "Enable AHB driver for NVIDIA Tegra SoCs"
default y
......
arch/arm/mach-tegra/Makefile
View file @ d1523b52
......@@ -29,7 +29,6 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += cpuidle-tegra30.o
endif
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
obj-$(CONFIG_TEGRA_PCI) += pcie.o
obj-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114_speedo.o
obj-$(CONFIG_ARCH_TEGRA_114_SOC) += sleep-tegra30.o
......@@ -38,6 +37,4 @@ ifeq ($(CONFIG_CPU_IDLE),y)
obj-$(CONFIG_ARCH_TEGRA_114_SOC) += cpuidle-tegra114.o
endif
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += board-harmony-pcie.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += board-paz00.o
arch/arm/mach-tegra/board-harmony-pcie.c deleted 100644 → 0
View file @ 734a0f6b
/*
* arch/arm/mach-tegra/board-harmony-pcie.c
*
* Copyright (C) 2010 CompuLab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <asm/mach-types.h>
#include "board.h"
#ifdef CONFIG_TEGRA_PCI
int __init harmony_pcie_init(void)
{
struct device_node *np;
int en_vdd_1v05;
struct regulator *regulator = NULL;
int err;
np = of_find_node_by_path("/regulators/regulator@3");
if (!np) {
pr_err("%s: of_find_node_by_path failed\n", __func__);
return -ENODEV;
}
en_vdd_1v05 = of_get_named_gpio(np, "gpio", 0);
if (en_vdd_1v05 < 0) {
pr_err("%s: of_get_named_gpio failed: %d\n", __func__,
en_vdd_1v05);
return en_vdd_1v05;
}
err = gpio_request(en_vdd_1v05, "EN_VDD_1V05");
if (err) {
pr_err("%s: gpio_request failed: %d\n", __func__, err);
return err;
}
gpio_direction_output(en_vdd_1v05, 1);
regulator = regulator_get(NULL, "vdd_ldo0,vddio_pex_clk");
if (IS_ERR(regulator)) {
err = PTR_ERR(regulator);
pr_err("%s: regulator_get failed: %d\n", __func__, err);
goto err_reg;
}
err = regulator_enable(regulator);
if (err) {
pr_err("%s: regulator_enable failed: %d\n", __func__, err);
goto err_en;
}
err = tegra_pcie_init(true, true);
if (err) {
pr_err("%s: tegra_pcie_init failed: %d\n", __func__, err);
goto err_pcie;
}
return 0;
err_pcie:
regulator_disable(regulator);
err_en:
regulator_put(regulator);
err_reg:
gpio_free(en_vdd_1v05);
return err;
}
#endif
arch/arm/mach-tegra/board.h
View file @ d1523b52
......@@ -31,7 +31,6 @@ void __init tegra_init_early(void);
void __init tegra_map_common_io(void);
void __init tegra_init_irq(void);
void __init tegra_dt_init_irq(void);
int __init tegra_pcie_init(bool init_port0, bool init_port1);
void tegra_init_late(void);
......@@ -48,13 +47,6 @@ int __init tegra_powergate_debugfs_init(void);
static inline int tegra_powergate_debugfs_init(void) { return 0; }
#endif
int __init harmony_regulator_init(void);
#ifdef CONFIG_TEGRA_PCI
int __init harmony_pcie_init(void);
#else
static inline int harmony_pcie_init(void) { return 0; }
#endif
void __init tegra_paz00_wifikill_init(void);
#endif
arch/arm/mach-tegra/iomap.h
View file @ d1523b52
......@@ -286,9 +286,6 @@
#define IO_APB_VIRT IOMEM(0xFE300000)
#define IO_APB_SIZE SZ_1M
#define TEGRA_PCIE_BASE 0x80000000
#define TEGRA_PCIE_IO_BASE (TEGRA_PCIE_BASE + SZ_4M)
#define IO_TO_VIRT_BETWEEN(p, st, sz) ((p) >= (st) && (p) < ((st) + (sz)))
#define IO_TO_VIRT_XLATE(p, pst, vst) (((p) - (pst) + (vst)))
......
arch/arm/mach-tegra/pcie.c deleted 100644 → 0
View file @ 734a0f6b
/*
* arch/arm/mach-tegra/pci.c
*
* PCIe host controller driver for TEGRA(2) SOCs
*
* Copyright (c) 2010, CompuLab, Ltd.
* Author: Mike Rapoport <mike@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 <linux/export.h>
#include <linux/clk/tegra.h>
#include <linux/tegra-powergate.h>
#include <asm/sizes.h>
#include <asm/mach/pci.h>
#include "board.h"
#include "iomap.h"
/* Hack - need to parse this from DT */
#define INT_PCIE_INTR 130
/* register definitions */
#define AFI_OFFSET 0x3800
#define PADS_OFFSET 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, reg_pmc_base + (reg))
#define pmc_readl(reg) \
__raw_readl(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 - 0x8040ffff - downstream IO
* 0x80410000 - 0x8fffffff - unused
* 0x90000000 - 0x9fffffff - non-prefetchable memory
* 0xa0000000 - 0xbfffffff - prefetchable memory
*/
#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 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 mem_space_name[16];
char prefetch_space_name[20];
struct resource res[2];
};
struct tegra_pcie_info {
struct tegra_pcie_port port[2];
int num_ports;
void __iomem *regs;
struct resource res_mmio;
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_OFFSET + tegra_pcie.regs);
}
static inline u32 afi_readl(unsigned long offset)
{
return readl(offset + AFI_OFFSET + tegra_pcie.regs);
}
static inline void pads_writel(u32 value, unsigned long offset)
{
writel(value, offset + PADS_OFFSET + tegra_pcie.regs);
}
static inline u32 pads_readl(unsigned long offset)
{
return readl(offset + PADS_OFFSET + 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 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);
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 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 tegra_pcie_relax_enable(struct pci_dev *dev)
{
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
}
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;
pci_ioremap_io(nr * SZ_64K, TEGRA_PCIE_IO_BASE);
/*
* 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[0].name = pp->mem_space_name;
if (pp->index == 0) {
pp->res[0].start = MEM_BASE_0;
pp->res[0].end = pp->res[0].start + MEM_SIZE_0 - 1;
} else {
pp->res[0].start = MEM_BASE_1;
pp->res[0].end = pp->res[0].start + MEM_SIZE_1 - 1;
}
pp->res[0].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource, &pp->res[0]))
panic("Request PCIe Memory resource failed\n");
pci_add_resource_offset(&sys->resources, &pp->res[0], sys->mem_offset);
/*
* 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[1].name = pp->prefetch_space_name;
if (pp->index == 0) {
pp->res[1].start = PREFETCH_MEM_BASE_0;
pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_0 - 1;
} else {
pp->res[1].start = PREFETCH_MEM_BASE_1;
pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_1 - 1;
}
pp->res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (request_resource(&iomem_resource, &pp->res[1]))
panic("Request PCIe Prefetch Memory resource failed\n");
pci_add_resource_offset(&sys->resources, &pp->res[1], sys->mem_offset);
return 1;
}
static int tegra_pcie_map_irq(const 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 NULL;
pp = tegra_pcie.port + nr;
pp->root_bus_nr = sys->busnr;
return pci_scan_root_bus(NULL, sys->busnr, &tegra_pcie_ops, sys,
&sys->resources);
}
static struct hw_pci tegra_pcie_hw __initdata = {
.nr_controllers = 2,
.setup = tegra_pcie_setup,
.scan = tegra_pcie_scan_bus,
.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("PCIE: %s, signature: %08x\n", err_msg[code], signature);
else
pr_err("PCIE: %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 = SZ_128K;
axi_address = TEGRA_PCIE_IO_BASE;
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 int tegra_pcie_enable_controller(void)
{
u32 val, reg;
int i, timeout;
/* 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 */
timeout = 300;
do {
val = pads_readl(PADS_PLL_CTL);
usleep_range(1000, 1000);
if (--timeout == 0) {
pr_err("Tegra PCIe error: timeout waiting for PLL\n");
return -EBUSY;
}
} 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 0;
}
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 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_powergate_power_off(TEGRA_POWERGATE_PCIE);
tegra_pcie_xclk_clamp(true);
}
static int tegra_pcie_power_regate(void)
{
int err;
tegra_pcie_power_off();
tegra_pcie_xclk_clamp(true);
tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
tegra_periph_reset_assert(tegra_pcie.afi_clk);
err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
tegra_pcie.pex_clk);
if (err) {
pr_err("PCIE: powerup sequence failed: %d\n", err);
return err;
}
tegra_periph_reset_deassert(tegra_pcie.afi_clk);
tegra_pcie_xclk_clamp(false);
clk_prepare_enable(tegra_pcie.afi_clk);
clk_prepare_enable(tegra_pcie.pex_clk);
return clk_prepare_enable(tegra_pcie.pll_e);
}
static int tegra_pcie_clocks_get(void)
{
int err;
tegra_pcie.pex_clk = clk_get(NULL, "pex");
if (IS_ERR(tegra_pcie.pex_clk))
return PTR_ERR(tegra_pcie.pex_clk);
tegra_pcie.afi_clk = clk_get(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(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("PCIE: failed to get clocks: %d\n", err);
return err;
}
err = tegra_pcie_power_regate();
if (err) {
pr_err("PCIE: failed to power up: %d\n", err);
goto err_pwr_on;
}
tegra_pcie.regs = ioremap_nocache(TEGRA_PCIE_BASE, PCIE_IOMAP_SZ);
if (tegra_pcie.regs == NULL) {
pr_err("PCIE: Failed to map PCI/AFI registers\n");
err = -ENOMEM;
goto err_map_reg;
}
err = request_irq(INT_PCIE_INTR, tegra_pcie_isr,
IRQF_SHARED, "PCIE", &tegra_pcie);
if (err) {
pr_err("PCIE: Failed to register IRQ: %d\n", err);
goto err_req_io;
}
set_irq_flags(INT_PCIE_INTR, IRQF_VALID);
return 0;
err_req_io:
iounmap(tegra_pcie.regs);
err_map_reg:
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;
pcibios_min_mem = 0;
err = tegra_pcie_get_resources();
if (err)
return err;
err = tegra_pcie_enable_controller();
if (err)
return err;
/* 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;
}
arch/arm/mach-tegra/tegra.c
View file @ d1523b52
......@@ -116,28 +116,6 @@ static void __init tegra_dt_init(void)
tegra20_auxdata_lookup, parent);
}
static void __init trimslice_init(void)
{
#ifdef CONFIG_TEGRA_PCI
int ret;
ret = tegra_pcie_init(true, true);
if (ret)
pr_err("tegra_pci_init() failed: %d\n", ret);
#endif
}
static void __init harmony_init(void)
{
#ifdef CONFIG_TEGRA_PCI
int ret;
ret = harmony_pcie_init();
if (ret)
pr_err("harmony_pcie_init() failed: %d\n", ret);
#endif
}
static void __init paz00_init(void)
{
if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
......@@ -148,8 +126,6 @@ static struct {
char *machine;
void (*init)(void);
} board_init_funcs[] = {
{ "compulab,trimslice", trimslice_init },
{ "nvidia,harmony", harmony_init },
{ "compal,paz00", paz00_init },
};
......
drivers/pci/host/Kconfig
View file @ d1523b52
......@@ -14,4 +14,8 @@ config PCI_EXYNOS
select PCIEPORTBUS
select PCIE_DW
config PCI_TEGRA
bool "NVIDIA Tegra PCIe controller"
depends on ARCH_TEGRA
endmenu
drivers/pci/host/Makefile
View file @ d1523b52
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
drivers/pci/host/pci-tegra.c 0 → 100644
View file @ d1523b52
/*
* PCIe host controller driver for TEGRA(2) SOCs
*
* Copyright (c) 2010, CompuLab, Ltd.
* Author: Mike Rapoport <mike@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/clk.h>
#include <linux/clk/tegra.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/tegra-powergate.h>
#include <linux/vmalloc.h>
#include <linux/regulator/consumer.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include <asm/mach/pci.h>
#define INT_PCI_MSI_NR (8 * 32)
#define TEGRA_MAX_PORTS 2
/* register definitions */
#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_MSI_VEC0 0x6c
#define AFI_MSI_VEC1 0x70
#define AFI_MSI_VEC2 0x74
#define AFI_MSI_VEC3 0x78
#define AFI_MSI_VEC4 0x7c
#define AFI_MSI_VEC5 0x80
#define AFI_MSI_VEC6 0x84
#define AFI_MSI_VEC7 0x88
#define AFI_MSI_EN_VEC0 0x8c
#define AFI_MSI_EN_VEC1 0x90
#define AFI_MSI_EN_VEC2 0x94
#define AFI_MSI_EN_VEC3 0x98
#define AFI_MSI_EN_VEC4 0x9c
#define AFI_MSI_EN_VEC5 0xa0
#define AFI_MSI_EN_VEC6 0xa4
#define AFI_MSI_EN_VEC7 0xa8
#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_AXI_SLAVE_ERROR 1
#define AFI_INTR_AXI_DECODE_ERROR 2
#define AFI_INTR_TARGET_ABORT 3
#define AFI_INTR_MASTER_ABORT 4
#define AFI_INTR_INVALID_WRITE 5
#define AFI_INTR_LEGACY 6
#define AFI_INTR_FPCI_DECODE_ERROR 7
#define AFI_INTR_SIGNATURE 0xbc
#define AFI_UPPER_FPCI_ADDRESS 0xc0
#define AFI_SM_INTR_ENABLE 0xc4
#define AFI_SM_INTR_INTA_ASSERT (1 << 0)
#define AFI_SM_INTR_INTB_ASSERT (1 << 1)
#define AFI_SM_INTR_INTC_ASSERT (1 << 2)
#define AFI_SM_INTR_INTD_ASSERT (1 << 3)
#define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
#define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
#define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
#define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
#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_PCIE_DISABLE(x) (1 << ((x) + 1))
#define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
#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_DL_LINK_ACTIVE 0x20000000
#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)
struct tegra_msi {
struct msi_chip chip;
DECLARE_BITMAP(used, INT_PCI_MSI_NR);
struct irq_domain *domain;
unsigned long pages;
struct mutex lock;
int irq;
};
static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
{
return container_of(chip, struct tegra_msi, chip);
}
struct tegra_pcie {
struct device *dev;
void __iomem *pads;
void __iomem *afi;
int irq;
struct list_head busses;
struct resource *cs;
struct resource io;
struct resource mem;
struct resource prefetch;
struct resource busn;
struct clk *pex_clk;
struct clk *afi_clk;
struct clk *pcie_xclk;
struct clk *pll_e;
struct tegra_msi msi;
struct list_head ports;
unsigned int num_ports;
u32 xbar_config;
struct regulator *pex_clk_supply;
struct regulator *vdd_supply;
};
struct tegra_pcie_port {
struct tegra_pcie *pcie;
struct list_head list;
struct resource regs;
void __iomem *base;
unsigned int index;
unsigned int lanes;
};
struct tegra_pcie_bus {
struct vm_struct *area;
struct list_head list;
unsigned int nr;
};
static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys)
{
return sys->private_data;
}
static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
unsigned long offset)
{
writel(value, pcie->afi + offset);
}
static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
{
return readl(pcie->afi + offset);
}
static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
unsigned long offset)
{
writel(value, pcie->pads + offset);
}
static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
{
return readl(pcie->pads + offset);
}
/*
* The configuration space mapping on Tegra is somewhat similar to the ECAM
* defined by PCIe. However it deviates a bit in how the 4 bits for extended
* register accesses are mapped:
*
* [27:24] extended register number
* [23:16] bus number
* [15:11] device number
* [10: 8] function number
* [ 7: 0] register number
*
* Mapping the whole extended configuration space would require 256 MiB of
* virtual address space, only a small part of which will actually be used.
* To work around this, a 1 MiB of virtual addresses are allocated per bus
* when the bus is first accessed. When the physical range is mapped, the
* the bus number bits are hidden so that the extended register number bits
* appear as bits [19:16]. Therefore the virtual mapping looks like this:
*
* [19:16] extended register number
* [15:11] device number
* [10: 8] function number
* [ 7: 0] register number
*
* This is achieved by stitching together 16 chunks of 64 KiB of physical
* address space via the MMU.
*/
static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where)
{
return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) |
(PCI_FUNC(devfn) << 8) | (where & 0xfc);
}
static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
unsigned int busnr)
{
pgprot_t prot = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN |
L_PTE_MT_DEV_SHARED | L_PTE_SHARED;
phys_addr_t cs = pcie->cs->start;
struct tegra_pcie_bus *bus;
unsigned int i;
int err;
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&bus->list);
bus->nr = busnr;
/* allocate 1 MiB of virtual addresses */
bus->area = get_vm_area(SZ_1M, VM_IOREMAP);
if (!bus->area) {
err = -ENOMEM;
goto free;
}
/* map each of the 16 chunks of 64 KiB each */
for (i = 0; i < 16; i++) {
unsigned long virt = (unsigned long)bus->area->addr +
i * SZ_64K;
phys_addr_t phys = cs + i * SZ_1M + busnr * SZ_64K;
err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
if (err < 0) {
dev_err(pcie->dev, "ioremap_page_range() failed: %d\n",
err);
goto unmap;
}
}
return bus;
unmap:
vunmap(bus->area->addr);
free:
kfree(bus);
return ERR_PTR(err);
}
/*
* Look up a virtual address mapping for the specified bus number. If no such
* mapping existis, try to create one.
*/
static void __iomem *tegra_pcie_bus_map(struct tegra_pcie *pcie,
unsigned int busnr)
{
struct tegra_pcie_bus *bus;
list_for_each_entry(bus, &pcie->busses, list)
if (bus->nr == busnr)
return bus->area->addr;
bus = tegra_pcie_bus_alloc(pcie, busnr);
if (IS_ERR(bus))
return NULL;
list_add_tail(&bus->list, &pcie->busses);
return bus->area->addr;
}
static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus,
unsigned int devfn,
int where)
{
struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
void __iomem *addr = NULL;
if (bus->number == 0) {
unsigned int slot = PCI_SLOT(devfn);
struct tegra_pcie_port *port;
list_for_each_entry(port, &pcie->ports, list) {
if (port->index + 1 == slot) {
addr = port->base + (where & ~3);
break;
}
}
} else {
addr = tegra_pcie_bus_map(pcie, bus->number);
if (!addr) {
dev_err(pcie->dev,
"failed to map cfg. space for bus %u\n",
bus->number);
return NULL;
}
addr += tegra_pcie_conf_offset(devfn, where);
}
return addr;
}
static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *value)
{
void __iomem *addr;
addr = tegra_pcie_conf_address(bus, devfn, where);
if (!addr) {
*value = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
*value = readl(addr);
if (size == 1)
*value = (*value >> (8 * (where & 3))) & 0xff;
else if (size == 2)
*value = (*value >> (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 value)
{
void __iomem *addr;
u32 mask, tmp;
addr = tegra_pcie_conf_address(bus, devfn, where);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 4) {
writel(value, 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 |= value << ((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 unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
{
unsigned long ret = 0;
switch (port->index) {
case 0:
ret = AFI_PEX0_CTRL;
break;
case 1:
ret = AFI_PEX1_CTRL;
break;
}
return ret;
}
static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
{
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
unsigned long value;
/* pulse reset signal */
value = afi_readl(port->pcie, ctrl);
value &= ~AFI_PEX_CTRL_RST;
afi_writel(port->pcie, value, ctrl);
usleep_range(1000, 2000);
value = afi_readl(port->pcie, ctrl);
value |= AFI_PEX_CTRL_RST;
afi_writel(port->pcie, value, ctrl);
}
static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
{
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
unsigned long value;
/* enable reference clock */
value = afi_readl(port->pcie, ctrl);
value |= AFI_PEX_CTRL_REFCLK_EN;
afi_writel(port->pcie, value, ctrl);
tegra_pcie_port_reset(port);
}
static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
{
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
unsigned long value;
/* assert port reset */
value = afi_readl(port->pcie, ctrl);
value &= ~AFI_PEX_CTRL_RST;
afi_writel(port->pcie, value, ctrl);
/* disable reference clock */
value = afi_readl(port->pcie, ctrl);
value &= ~AFI_PEX_CTRL_REFCLK_EN;
afi_writel(port->pcie, value, ctrl);
}
static void tegra_pcie_port_free(struct tegra_pcie_port *port)
{
struct tegra_pcie *pcie = port->pcie;
devm_iounmap(pcie->dev, port->base);
devm_release_mem_region(pcie->dev, port->regs.start,
resource_size(&port->regs));
list_del(&port->list);
devm_kfree(pcie->dev, port);
}
static void 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);
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 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 tegra_pcie_relax_enable(struct pci_dev *dev)
{
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
}
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 *pcie = sys_to_pcie(sys);
pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
pci_add_resource_offset(&sys->resources, &pcie->prefetch,
sys->mem_offset);
pci_add_resource(&sys->resources, &pcie->busn);
pci_ioremap_io(nr * SZ_64K, pcie->io.start);
return 1;
}
static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
{
struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata);
return pcie->irq;
}
static void tegra_pcie_add_bus(struct pci_bus *bus)
{
if (IS_ENABLED(CONFIG_PCI_MSI)) {
struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
bus->msi = &pcie->msi.chip;
}
}
static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys)
{
struct tegra_pcie *pcie = sys_to_pcie(sys);
struct pci_bus *bus;
bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys,
&sys->resources);
if (!bus)
return NULL;
pci_scan_child_bus(bus);
return bus;
}
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",
"Transaction timeout",
};
struct tegra_pcie *pcie = arg;
u32 code, signature;
code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
afi_writel(pcie, 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)
dev_dbg(pcie->dev, "%s, signature: %08x\n", err_msg[code],
signature);
else
dev_err(pcie->dev, "%s, signature: %08x\n", err_msg[code],
signature);
if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
code == AFI_INTR_FPCI_DECODE_ERROR) {
u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
if (code == AFI_INTR_MASTER_ABORT)
dev_dbg(pcie->dev, " FPCI address: %10llx\n", address);
else
dev_err(pcie->dev, " FPCI address: %10llx\n", address);
}
return IRQ_HANDLED;
}
/*
* FPCI map is as follows:
* - 0xfdfc000000: I/O space
* - 0xfdfe000000: type 0 configuration space
* - 0xfdff000000: type 1 configuration space
* - 0xfe00000000: type 0 extended configuration space
* - 0xfe10000000: type 1 extended configuration space
*/
static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
{
u32 fpci_bar, size, axi_address;
/* Bar 0: type 1 extended configuration space */
fpci_bar = 0xfe100000;
size = resource_size(pcie->cs);
axi_address = pcie->cs->start;
afi_writel(pcie, axi_address, AFI_AXI_BAR0_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0);
/* Bar 1: downstream IO bar */
fpci_bar = 0xfdfc0000;
size = resource_size(&pcie->io);
axi_address = pcie->io.start;
afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
/* Bar 2: prefetchable memory BAR */
fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
size = resource_size(&pcie->prefetch);
axi_address = pcie->prefetch.start;
afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
/* Bar 3: non prefetchable memory BAR */
fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
size = resource_size(&pcie->mem);
axi_address = pcie->mem.start;
afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
/* NULL out the remaining BARs as they are not used */
afi_writel(pcie, 0, AFI_AXI_BAR4_START);
afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
afi_writel(pcie, 0, AFI_FPCI_BAR4);
afi_writel(pcie, 0, AFI_AXI_BAR5_START);
afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
afi_writel(pcie, 0, AFI_FPCI_BAR5);
/* map all upstream transactions as uncached */
afi_writel(pcie, PHYS_OFFSET, AFI_CACHE_BAR0_ST);
afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
/* MSI translations are setup only when needed */
afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
}
static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
{
struct tegra_pcie_port *port;
unsigned int timeout;
unsigned long value;
/* configure mode and disable all ports */
value = afi_readl(pcie, AFI_PCIE_CONFIG);
value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
list_for_each_entry(port, &pcie->ports, list)
value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
afi_writel(pcie, value, AFI_PCIE_CONFIG);
value = afi_readl(pcie, AFI_FUSE);
value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
afi_writel(pcie, value, AFI_FUSE);
/* initialze internal PHY, enable up to 16 PCIE lanes */
pads_writel(pcie, 0x0, PADS_CTL_SEL);
/* override IDDQ to 1 on all 4 lanes */
value = pads_readl(pcie, PADS_CTL);
value |= PADS_CTL_IDDQ_1L;
pads_writel(pcie, value, PADS_CTL);
/*
* Set up PHY PLL inputs select PLLE output as refclock,
* set TX ref sel to div10 (not div5).
*/
value = pads_readl(pcie, PADS_PLL_CTL);
value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML |
PADS_PLL_CTL_TXCLKREF_DIV10;
pads_writel(pcie, value, PADS_PLL_CTL);
/* take PLL out of reset */
value = pads_readl(pcie, PADS_PLL_CTL);
value |= PADS_PLL_CTL_RST_B4SM;
pads_writel(pcie, value, PADS_PLL_CTL);
/*
* Hack, set the clock voltage to the DEFAULT provided by hw folks.
* This doesn't exist in the documentation.
*/
pads_writel(pcie, 0xfa5cfa5c, 0xc8);
/* wait for the PLL to lock */
timeout = 300;
do {
value = pads_readl(pcie, PADS_PLL_CTL);
usleep_range(1000, 2000);
if (--timeout == 0) {
pr_err("Tegra PCIe error: timeout waiting for PLL\n");
return -EBUSY;
}
} while (!(value & PADS_PLL_CTL_LOCKDET));
/* turn off IDDQ override */
value = pads_readl(pcie, PADS_CTL);
value &= ~PADS_CTL_IDDQ_1L;
pads_writel(pcie, value, PADS_CTL);
/* enable TX/RX data */
value = pads_readl(pcie, PADS_CTL);
value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
pads_writel(pcie, value, PADS_CTL);
/* take the PCIe interface module out of reset */
tegra_periph_reset_deassert(pcie->pcie_xclk);
/* finally enable PCIe */
value = afi_readl(pcie, AFI_CONFIGURATION);
value |= AFI_CONFIGURATION_EN_FPCI;
afi_writel(pcie, value, AFI_CONFIGURATION);
value = 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(pcie, value, AFI_AFI_INTR_ENABLE);
afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
/* don't enable MSI for now, only when needed */
afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
/* disable all exceptions */
afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
return 0;
}
static void tegra_pcie_power_off(struct tegra_pcie *pcie)
{
int err;
/* TODO: disable and unprepare clocks? */
tegra_periph_reset_assert(pcie->pcie_xclk);
tegra_periph_reset_assert(pcie->afi_clk);
tegra_periph_reset_assert(pcie->pex_clk);
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
err = regulator_disable(pcie->pex_clk_supply);
if (err < 0)
dev_err(pcie->dev, "failed to disable pex-clk regulator: %d\n",
err);
err = regulator_disable(pcie->vdd_supply);
if (err < 0)
dev_err(pcie->dev, "failed to disable VDD regulator: %d\n",
err);
}
static int tegra_pcie_power_on(struct tegra_pcie *pcie)
{
int err;
tegra_periph_reset_assert(pcie->pcie_xclk);
tegra_periph_reset_assert(pcie->afi_clk);
tegra_periph_reset_assert(pcie->pex_clk);
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
/* enable regulators */
err = regulator_enable(pcie->vdd_supply);
if (err < 0) {
dev_err(pcie->dev, "failed to enable VDD regulator: %d\n", err);
return err;
}
err = regulator_enable(pcie->pex_clk_supply);
if (err < 0) {
dev_err(pcie->dev, "failed to enable pex-clk regulator: %d\n",
err);
return err;
}
err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
pcie->pex_clk);
if (err) {
dev_err(pcie->dev, "powerup sequence failed: %d\n", err);
return err;
}
tegra_periph_reset_deassert(pcie->afi_clk);
err = clk_prepare_enable(pcie->afi_clk);
if (err < 0) {
dev_err(pcie->dev, "failed to enable AFI clock: %d\n", err);
return err;
}
err = clk_prepare_enable(pcie->pll_e);
if (err < 0) {
dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err);
return err;
}
return 0;
}
static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
{
pcie->pex_clk = devm_clk_get(pcie->dev, "pex");
if (IS_ERR(pcie->pex_clk))
return PTR_ERR(pcie->pex_clk);
pcie->afi_clk = devm_clk_get(pcie->dev, "afi");
if (IS_ERR(pcie->afi_clk))
return PTR_ERR(pcie->afi_clk);
pcie->pcie_xclk = devm_clk_get(pcie->dev, "pcie_xclk");
if (IS_ERR(pcie->pcie_xclk))
return PTR_ERR(pcie->pcie_xclk);
pcie->pll_e = devm_clk_get(pcie->dev, "pll_e");
if (IS_ERR(pcie->pll_e))
return PTR_ERR(pcie->pll_e);
return 0;
}
static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
struct resource *pads, *afi, *res;
int err;
err = tegra_pcie_clocks_get(pcie);
if (err) {
dev_err(&pdev->dev, "failed to get clocks: %d\n", err);
return err;
}
err = tegra_pcie_power_on(pcie);
if (err) {
dev_err(&pdev->dev, "failed to power up: %d\n", err);
return err;
}
/* request and remap controller registers */
pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
if (!pads) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");
if (!afi) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
pcie->pads = devm_request_and_ioremap(&pdev->dev, pads);
if (!pcie->pads) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
pcie->afi = devm_request_and_ioremap(&pdev->dev, afi);
if (!pcie->afi) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
/* request and remap configuration space */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
if (!res) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
pcie->cs = devm_request_mem_region(pcie->dev, res->start,
resource_size(res), res->name);
if (!pcie->cs) {
err = -EADDRNOTAVAIL;
goto poweroff;
}
/* request interrupt */
err = platform_get_irq_byname(pdev, "intr");
if (err < 0) {
dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
goto poweroff;
}
pcie->irq = err;
err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
if (err) {
dev_err(&pdev->dev, "failed to register IRQ: %d\n", err);
goto poweroff;
}
return 0;
poweroff:
tegra_pcie_power_off(pcie);
return err;
}
static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
{
if (pcie->irq > 0)
free_irq(pcie->irq, pcie);
tegra_pcie_power_off(pcie);
return 0;
}
static int tegra_msi_alloc(struct tegra_msi *chip)
{
int msi;
mutex_lock(&chip->lock);
msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
if (msi < INT_PCI_MSI_NR)
set_bit(msi, chip->used);
else
msi = -ENOSPC;
mutex_unlock(&chip->lock);
return msi;
}
static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq)
{
struct device *dev = chip->chip.dev;
mutex_lock(&chip->lock);
if (!test_bit(irq, chip->used))
dev_err(dev, "trying to free unused MSI#%lu\n", irq);
else
clear_bit(irq, chip->used);
mutex_unlock(&chip->lock);
}
static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
{
struct tegra_pcie *pcie = data;
struct tegra_msi *msi = &pcie->msi;
unsigned int i, processed = 0;
for (i = 0; i < 8; i++) {
unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
while (reg) {
unsigned int offset = find_first_bit(&reg, 32);
unsigned int index = i * 32 + offset;
unsigned int irq;
/* clear the interrupt */
afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4);
irq = irq_find_mapping(msi->domain, index);
if (irq) {
if (test_bit(index, msi->used))
generic_handle_irq(irq);
else
dev_info(pcie->dev, "unhandled MSI\n");
} else {
/*
* that's weird who triggered this?
* just clear it
*/
dev_info(pcie->dev, "unexpected MSI\n");
}
/* see if there's any more pending in this vector */
reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
processed++;
}
}
return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
}
static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
struct msi_desc *desc)
{
struct tegra_msi *msi = to_tegra_msi(chip);
struct msi_msg msg;
unsigned int irq;
int hwirq;
hwirq = tegra_msi_alloc(msi);
if (hwirq < 0)
return hwirq;
irq = irq_create_mapping(msi->domain, hwirq);
if (!irq)
return -EINVAL;
irq_set_msi_desc(irq, desc);
msg.address_lo = virt_to_phys((void *)msi->pages);
/* 32 bit address only */
msg.address_hi = 0;
msg.data = hwirq;
write_msi_msg(irq, &msg);
return 0;
}
static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
{
struct tegra_msi *msi = to_tegra_msi(chip);
struct irq_data *d = irq_get_irq_data(irq);
tegra_msi_free(msi, d->hwirq);
}
static struct irq_chip tegra_msi_irq_chip = {
.name = "Tegra PCIe MSI",
.irq_enable = unmask_msi_irq,
.irq_disable = mask_msi_irq,
.irq_mask = mask_msi_irq,
.irq_unmask = unmask_msi_irq,
};
static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq);
irq_set_chip_data(irq, domain->host_data);
set_irq_flags(irq, IRQF_VALID);
return 0;
}
static const struct irq_domain_ops msi_domain_ops = {
.map = tegra_msi_map,
};
static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
struct tegra_msi *msi = &pcie->msi;
unsigned long base;
int err;
u32 reg;
mutex_init(&msi->lock);
msi->chip.dev = pcie->dev;
msi->chip.setup_irq = tegra_msi_setup_irq;
msi->chip.teardown_irq = tegra_msi_teardown_irq;
msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
&msi_domain_ops, &msi->chip);
if (!msi->domain) {
dev_err(&pdev->dev, "failed to create IRQ domain\n");
return -ENOMEM;
}
err = platform_get_irq_byname(pdev, "msi");
if (err < 0) {
dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
goto err;
}
msi->irq = err;
err = request_irq(msi->irq, tegra_pcie_msi_irq, 0,
tegra_msi_irq_chip.name, pcie);
if (err < 0) {
dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
goto err;
}
/* setup AFI/FPCI range */
msi->pages = __get_free_pages(GFP_KERNEL, 0);
base = virt_to_phys((void *)msi->pages);
afi_writel(pcie, base, AFI_MSI_FPCI_BAR_ST);
afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
/* this register is in 4K increments */
afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
/* enable all MSI vectors */
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
/* and unmask the MSI interrupt */
reg = afi_readl(pcie, AFI_INTR_MASK);
reg |= AFI_INTR_MASK_MSI_MASK;
afi_writel(pcie, reg, AFI_INTR_MASK);
return 0;
err:
irq_domain_remove(msi->domain);
return err;
}
static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
{
struct tegra_msi *msi = &pcie->msi;
unsigned int i, irq;
u32 value;
/* mask the MSI interrupt */
value = afi_readl(pcie, AFI_INTR_MASK);
value &= ~AFI_INTR_MASK_MSI_MASK;
afi_writel(pcie, value, AFI_INTR_MASK);
/* disable all MSI vectors */
afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
free_pages(msi->pages, 0);
if (msi->irq > 0)
free_irq(msi->irq, pcie);
for (i = 0; i < INT_PCI_MSI_NR; i++) {
irq = irq_find_mapping(msi->domain, i);
if (irq > 0)
irq_dispose_mapping(irq);
}
irq_domain_remove(msi->domain);
return 0;
}
static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
u32 *xbar)
{
struct device_node *np = pcie->dev->of_node;
switch (lanes) {
case 0x00000004:
dev_info(pcie->dev, "single-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
return 0;
case 0x00000202:
dev_info(pcie->dev, "dual-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
return 0;
}
return -EINVAL;
}
static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
{
struct device_node *np = pcie->dev->of_node, *port;
struct of_pci_range_parser parser;
struct of_pci_range range;
struct resource res;
u32 lanes = 0;
int err;
if (of_pci_range_parser_init(&parser, np)) {
dev_err(pcie->dev, "missing \"ranges\" property\n");
return -EINVAL;
}
pcie->vdd_supply = devm_regulator_get(pcie->dev, "vdd");
if (IS_ERR(pcie->vdd_supply))
return PTR_ERR(pcie->vdd_supply);
pcie->pex_clk_supply = devm_regulator_get(pcie->dev, "pex-clk");
if (IS_ERR(pcie->pex_clk_supply))
return PTR_ERR(pcie->pex_clk_supply);
for_each_of_pci_range(&parser, &range) {
of_pci_range_to_resource(&range, np, &res);
switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
memcpy(&pcie->io, &res, sizeof(res));
pcie->io.name = "I/O";
break;
case IORESOURCE_MEM:
if (res.flags & IORESOURCE_PREFETCH) {
memcpy(&pcie->prefetch, &res, sizeof(res));
pcie->prefetch.name = "PREFETCH";
} else {
memcpy(&pcie->mem, &res, sizeof(res));
pcie->mem.name = "MEM";
}
break;
}
}
err = of_pci_parse_bus_range(np, &pcie->busn);
if (err < 0) {
dev_err(pcie->dev, "failed to parse ranges property: %d\n",
err);
pcie->busn.name = np->name;
pcie->busn.start = 0;
pcie->busn.end = 0xff;
pcie->busn.flags = IORESOURCE_BUS;
}
/* parse root ports */
for_each_child_of_node(np, port) {
struct tegra_pcie_port *rp;
unsigned int index;
u32 value;
err = of_pci_get_devfn(port);
if (err < 0) {
dev_err(pcie->dev, "failed to parse address: %d\n",
err);
return err;
}
index = PCI_SLOT(err);
if (index < 1 || index > TEGRA_MAX_PORTS) {
dev_err(pcie->dev, "invalid port number: %d\n", index);
return -EINVAL;
}
index--;
err = of_property_read_u32(port, "nvidia,num-lanes", &value);
if (err < 0) {
dev_err(pcie->dev, "failed to parse # of lanes: %d\n",
err);
return err;
}
if (value > 16) {
dev_err(pcie->dev, "invalid # of lanes: %u\n", value);
return -EINVAL;
}
lanes |= value << (index << 3);
if (!of_device_is_available(port))
continue;
rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL);
if (!rp)
return -ENOMEM;
err = of_address_to_resource(port, 0, &rp->regs);
if (err < 0) {
dev_err(pcie->dev, "failed to parse address: %d\n",
err);
return err;
}
INIT_LIST_HEAD(&rp->list);
rp->index = index;
rp->lanes = value;
rp->pcie = pcie;
rp->base = devm_request_and_ioremap(pcie->dev, &rp->regs);
if (!rp->base)
return -EADDRNOTAVAIL;
list_add_tail(&rp->list, &pcie->ports);
}
err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
if (err < 0) {
dev_err(pcie->dev, "invalid lane configuration\n");
return err;
}
return 0;
}
/*
* 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_port_check_link(struct tegra_pcie_port *port)
{
unsigned int retries = 3;
unsigned long value;
do {
unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
do {
value = readl(port->base + RP_VEND_XP);
if (value & RP_VEND_XP_DL_UP)
break;
usleep_range(1000, 2000);
} while (--timeout);
if (!timeout) {
dev_err(port->pcie->dev, "link %u down, retrying\n",
port->index);
goto retry;
}
timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
do {
value = readl(port->base + RP_LINK_CONTROL_STATUS);
if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
return true;
usleep_range(1000, 2000);
} while (--timeout);
retry:
tegra_pcie_port_reset(port);
} while (--retries);
return false;
}
static int tegra_pcie_enable(struct tegra_pcie *pcie)
{
struct tegra_pcie_port *port, *tmp;
struct hw_pci hw;
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
dev_info(pcie->dev, "probing port %u, using %u lanes\n",
port->index, port->lanes);
tegra_pcie_port_enable(port);
if (tegra_pcie_port_check_link(port))
continue;
dev_info(pcie->dev, "link %u down, ignoring\n", port->index);
tegra_pcie_port_disable(port);
tegra_pcie_port_free(port);
}
memset(&hw, 0, sizeof(hw));
hw.nr_controllers = 1;
hw.private_data = (void **)&pcie;
hw.setup = tegra_pcie_setup;
hw.map_irq = tegra_pcie_map_irq;
hw.add_bus = tegra_pcie_add_bus;
hw.scan = tegra_pcie_scan_bus;
hw.ops = &tegra_pcie_ops;
pci_common_init_dev(pcie->dev, &hw);
return 0;
}
static int tegra_pcie_probe(struct platform_device *pdev)
{
struct tegra_pcie *pcie;
int err;
pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
INIT_LIST_HEAD(&pcie->busses);
INIT_LIST_HEAD(&pcie->ports);
pcie->dev = &pdev->dev;
err = tegra_pcie_parse_dt(pcie);
if (err < 0)
return err;
pcibios_min_mem = 0;
err = tegra_pcie_get_resources(pcie);
if (err < 0) {
dev_err(&pdev->dev, "failed to request resources: %d\n", err);
return err;
}
err = tegra_pcie_enable_controller(pcie);
if (err)
goto put_resources;
/* setup the AFI address translations */
tegra_pcie_setup_translations(pcie);
if (IS_ENABLED(CONFIG_PCI_MSI)) {
err = tegra_pcie_enable_msi(pcie);
if (err < 0) {
dev_err(&pdev->dev,
"failed to enable MSI support: %d\n",
err);
goto put_resources;
}
}
err = tegra_pcie_enable(pcie);
if (err < 0) {
dev_err(&pdev->dev, "failed to enable PCIe ports: %d\n", err);
goto disable_msi;
}
platform_set_drvdata(pdev, pcie);
return 0;
disable_msi:
if (IS_ENABLED(CONFIG_PCI_MSI))
tegra_pcie_disable_msi(pcie);
put_resources:
tegra_pcie_put_resources(pcie);
return err;
}
static const struct of_device_id tegra_pcie_of_match[] = {
{ .compatible = "nvidia,tegra20-pcie", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
static struct platform_driver tegra_pcie_driver = {
.driver = {
.name = "tegra-pcie",
.owner = THIS_MODULE,
.of_match_table = tegra_pcie_of_match,
.suppress_bind_attrs = true,
},
.probe = tegra_pcie_probe,
};
module_platform_driver(tegra_pcie_driver);
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra PCIe driver");
MODULE_LICENSE("GPLv2");
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