Merge branch 'pci/host-xgene' into next

* pci/host-xgene:
  arm64: dts: Add APM X-Gene PCIe device tree nodes
  PCI: xgene: Add APM X-Gene PCIe driver

Conflicts:
	drivers/pci/host/Kconfig
	drivers/pci/host/Makefile
This commit is contained in:
Bjorn Helgaas 2014-10-06 09:59:15 -06:00
Родитель 55dd4175a4 767ebaff4e
Коммит f92d9ee3ab
7 изменённых файлов: 908 добавлений и 1 удалений

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@ -0,0 +1,57 @@
* AppliedMicro X-Gene PCIe interface
Required properties:
- device_type: set to "pci"
- compatible: should contain "apm,xgene-pcie" to identify the core.
- 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:
"csr": controller configuration registers.
"cfg": pcie configuration space registers.
- #address-cells: set to <3>
- #size-cells: set to <2>
- ranges: ranges for the outbound memory, I/O regions.
- dma-ranges: ranges for the inbound memory regions.
- #interrupt-cells: set to <1>
- interrupt-map-mask and interrupt-map: standard PCI properties
to define the mapping of the PCIe interface to interrupt
numbers.
- clocks: from common clock binding: handle to pci clock.
Optional properties:
- status: Either "ok" or "disabled".
- dma-coherent: Present if dma operations are coherent
Example:
SoC specific DT Entry:
pcie0: pcie@1f2b0000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f2b0000 0x0 0x00010000 /* Controller registers */
0xe0 0xd0000000 0x0 0x00040000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x00 0x00000000 0xe0 0x10000000 0x00 0x00010000 /* io */
0x02000000 0x00 0x80000000 0xe1 0x80000000 0x00 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xc2 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xc3 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xc4 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xc5 0x1>;
dma-coherent;
clocks = <&pcie0clk 0>;
};
Board specific DT Entry:
&pcie0 {
status = "ok";
};

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@ -6868,6 +6868,14 @@ F: include/linux/pci*
F: arch/x86/pci/ F: arch/x86/pci/
F: arch/x86/kernel/quirks.c F: arch/x86/kernel/quirks.c
PCI DRIVER FOR APPLIEDMICRO XGENE
M: Tanmay Inamdar <tinamdar@apm.com>
L: linux-pci@vger.kernel.org
L: linux-arm-kernel@lists.infradead.org
S: Maintained
F: Documentation/devicetree/bindings/pci/xgene-pci.txt
F: drivers/pci/host/pci-xgene.c
PCI DRIVER FOR IMX6 PCI DRIVER FOR IMX6
M: Richard Zhu <r65037@freescale.com> M: Richard Zhu <r65037@freescale.com>
M: Lucas Stach <l.stach@pengutronix.de> M: Lucas Stach <l.stach@pengutronix.de>

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@ -25,6 +25,14 @@
}; };
}; };
&pcie0clk {
status = "ok";
};
&pcie0 {
status = "ok";
};
&serial0 { &serial0 {
status = "ok"; status = "ok";
}; };

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@ -269,6 +269,171 @@
enable-mask = <0x2>; enable-mask = <0x2>;
clock-output-names = "rtcclk"; clock-output-names = "rtcclk";
}; };
pcie0clk: pcie0clk@1f2bc000 {
status = "disabled";
compatible = "apm,xgene-device-clock";
#clock-cells = <1>;
clocks = <&socplldiv2 0>;
reg = <0x0 0x1f2bc000 0x0 0x1000>;
reg-names = "csr-reg";
clock-output-names = "pcie0clk";
};
pcie1clk: pcie1clk@1f2cc000 {
status = "disabled";
compatible = "apm,xgene-device-clock";
#clock-cells = <1>;
clocks = <&socplldiv2 0>;
reg = <0x0 0x1f2cc000 0x0 0x1000>;
reg-names = "csr-reg";
clock-output-names = "pcie1clk";
};
pcie2clk: pcie2clk@1f2dc000 {
status = "disabled";
compatible = "apm,xgene-device-clock";
#clock-cells = <1>;
clocks = <&socplldiv2 0>;
reg = <0x0 0x1f2dc000 0x0 0x1000>;
reg-names = "csr-reg";
clock-output-names = "pcie2clk";
};
pcie3clk: pcie3clk@1f50c000 {
status = "disabled";
compatible = "apm,xgene-device-clock";
#clock-cells = <1>;
clocks = <&socplldiv2 0>;
reg = <0x0 0x1f50c000 0x0 0x1000>;
reg-names = "csr-reg";
clock-output-names = "pcie3clk";
};
pcie4clk: pcie4clk@1f51c000 {
status = "disabled";
compatible = "apm,xgene-device-clock";
#clock-cells = <1>;
clocks = <&socplldiv2 0>;
reg = <0x0 0x1f51c000 0x0 0x1000>;
reg-names = "csr-reg";
clock-output-names = "pcie4clk";
};
};
pcie0: pcie@1f2b0000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f2b0000 0x0 0x00010000 /* Controller registers */
0xe0 0xd0000000 0x0 0x00040000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x00 0x00000000 0xe0 0x10000000 0x00 0x00010000 /* io */
0x02000000 0x00 0x80000000 0xe1 0x80000000 0x00 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xc2 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xc3 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xc4 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xc5 0x1>;
dma-coherent;
clocks = <&pcie0clk 0>;
};
pcie1: pcie@1f2c0000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f2c0000 0x0 0x00010000 /* Controller registers */
0xd0 0xd0000000 0x0 0x00040000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x0 0x00000000 0xd0 0x10000000 0x00 0x00010000 /* io */
0x02000000 0x0 0x80000000 0xd1 0x80000000 0x00 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xc8 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xc9 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xca 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xcb 0x1>;
dma-coherent;
clocks = <&pcie1clk 0>;
};
pcie2: pcie@1f2d0000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f2d0000 0x0 0x00010000 /* Controller registers */
0x90 0xd0000000 0x0 0x00040000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x0 0x00000000 0x90 0x10000000 0x0 0x00010000 /* io */
0x02000000 0x0 0x80000000 0x91 0x80000000 0x0 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xce 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xcf 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xd0 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xd1 0x1>;
dma-coherent;
clocks = <&pcie2clk 0>;
};
pcie3: pcie@1f500000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f500000 0x0 0x00010000 /* Controller registers */
0xa0 0xd0000000 0x0 0x00040000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x0 0x00000000 0xa0 0x10000000 0x0 0x00010000 /* io */
0x02000000 0x0 0x80000000 0xa1 0x80000000 0x0 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xd4 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xd5 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xd6 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xd7 0x1>;
dma-coherent;
clocks = <&pcie3clk 0>;
};
pcie4: pcie@1f510000 {
status = "disabled";
device_type = "pci";
compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = < 0x00 0x1f510000 0x0 0x00010000 /* Controller registers */
0xc0 0xd0000000 0x0 0x00200000>; /* PCI config space */
reg-names = "csr", "cfg";
ranges = <0x01000000 0x0 0x00000000 0xc0 0x10000000 0x0 0x00010000 /* io */
0x02000000 0x0 0x80000000 0xc1 0x80000000 0x0 0x80000000>; /* mem */
dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xda 0x1
0x0 0x0 0x0 0x2 &gic 0x0 0xdb 0x1
0x0 0x0 0x0 0x3 &gic 0x0 0xdc 0x1
0x0 0x0 0x0 0x4 &gic 0x0 0xdd 0x1>;
dma-coherent;
clocks = <&pcie4clk 0>;
}; };
serial0: serial@1c020000 { serial0: serial@1c020000 {

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@ -63,7 +63,6 @@ config PCIE_SPEAR13XX
help help
Say Y here if you want PCIe support on SPEAr13XX SoCs. Say Y here if you want PCIe support on SPEAr13XX SoCs.
config PCI_KEYSTONE config PCI_KEYSTONE
bool "TI Keystone PCIe controller" bool "TI Keystone PCIe controller"
depends on ARCH_KEYSTONE depends on ARCH_KEYSTONE
@ -82,4 +81,14 @@ config PCIE_XILINX
Say 'Y' here if you want kernel to support the Xilinx AXI PCIe Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
Host Bridge driver. Host Bridge driver.
config PCI_XGENE
bool "X-Gene PCIe controller"
depends on ARCH_XGENE
depends on OF
select PCIEPORTBUS
help
Say Y here if you want internal PCI support on APM X-Gene SoC.
There are 5 internal PCIe ports available. Each port is GEN3 capable
and have varied lanes from x1 to x8.
endmenu endmenu

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@ -10,3 +10,4 @@ obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
obj-$(CONFIG_PCI_XGENE) += pci-xgene.o

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@ -0,0 +1,659 @@
/**
* APM X-Gene PCIe Driver
*
* Copyright (c) 2014 Applied Micro Circuits Corporation.
*
* Author: Tanmay Inamdar <tinamdar@apm.com>.
*
* 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.
*
*/
#include <linux/clk-private.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define PCIECORE_CTLANDSTATUS 0x50
#define PIM1_1L 0x80
#define IBAR2 0x98
#define IR2MSK 0x9c
#define PIM2_1L 0xa0
#define IBAR3L 0xb4
#define IR3MSKL 0xbc
#define PIM3_1L 0xc4
#define OMR1BARL 0x100
#define OMR2BARL 0x118
#define OMR3BARL 0x130
#define CFGBARL 0x154
#define CFGBARH 0x158
#define CFGCTL 0x15c
#define RTDID 0x160
#define BRIDGE_CFG_0 0x2000
#define BRIDGE_CFG_4 0x2010
#define BRIDGE_STATUS_0 0x2600
#define LINK_UP_MASK 0x00000100
#define AXI_EP_CFG_ACCESS 0x10000
#define EN_COHERENCY 0xF0000000
#define EN_REG 0x00000001
#define OB_LO_IO 0x00000002
#define XGENE_PCIE_VENDORID 0x10E8
#define XGENE_PCIE_DEVICEID 0xE004
#define SZ_1T (SZ_1G*1024ULL)
#define PIPE_PHY_RATE_RD(src) ((0xc000 & (u32)(src)) >> 0xe)
struct xgene_pcie_port {
struct device_node *node;
struct device *dev;
struct clk *clk;
void __iomem *csr_base;
void __iomem *cfg_base;
unsigned long cfg_addr;
bool link_up;
};
static inline u32 pcie_bar_low_val(u32 addr, u32 flags)
{
return (addr & PCI_BASE_ADDRESS_MEM_MASK) | flags;
}
/* PCIe Configuration Out/In */
static inline void xgene_pcie_cfg_out32(void __iomem *addr, int offset, u32 val)
{
writel(val, addr + offset);
}
static inline void xgene_pcie_cfg_out16(void __iomem *addr, int offset, u16 val)
{
u32 val32 = readl(addr + (offset & ~0x3));
switch (offset & 0x3) {
case 2:
val32 &= ~0xFFFF0000;
val32 |= (u32)val << 16;
break;
case 0:
default:
val32 &= ~0xFFFF;
val32 |= val;
break;
}
writel(val32, addr + (offset & ~0x3));
}
static inline void xgene_pcie_cfg_out8(void __iomem *addr, int offset, u8 val)
{
u32 val32 = readl(addr + (offset & ~0x3));
switch (offset & 0x3) {
case 0:
val32 &= ~0xFF;
val32 |= val;
break;
case 1:
val32 &= ~0xFF00;
val32 |= (u32)val << 8;
break;
case 2:
val32 &= ~0xFF0000;
val32 |= (u32)val << 16;
break;
case 3:
default:
val32 &= ~0xFF000000;
val32 |= (u32)val << 24;
break;
}
writel(val32, addr + (offset & ~0x3));
}
static inline void xgene_pcie_cfg_in32(void __iomem *addr, int offset, u32 *val)
{
*val = readl(addr + offset);
}
static inline void xgene_pcie_cfg_in16(void __iomem *addr, int offset, u32 *val)
{
*val = readl(addr + (offset & ~0x3));
switch (offset & 0x3) {
case 2:
*val >>= 16;
break;
}
*val &= 0xFFFF;
}
static inline void xgene_pcie_cfg_in8(void __iomem *addr, int offset, u32 *val)
{
*val = readl(addr + (offset & ~0x3));
switch (offset & 0x3) {
case 3:
*val = *val >> 24;
break;
case 2:
*val = *val >> 16;
break;
case 1:
*val = *val >> 8;
break;
}
*val &= 0xFF;
}
/*
* When the address bit [17:16] is 2'b01, the Configuration access will be
* treated as Type 1 and it will be forwarded to external PCIe device.
*/
static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus)
{
struct xgene_pcie_port *port = bus->sysdata;
if (bus->number >= (bus->primary + 1))
return port->cfg_base + AXI_EP_CFG_ACCESS;
return port->cfg_base;
}
/*
* For Configuration request, RTDID register is used as Bus Number,
* Device Number and Function number of the header fields.
*/
static void xgene_pcie_set_rtdid_reg(struct pci_bus *bus, uint devfn)
{
struct xgene_pcie_port *port = bus->sysdata;
unsigned int b, d, f;
u32 rtdid_val = 0;
b = bus->number;
d = PCI_SLOT(devfn);
f = PCI_FUNC(devfn);
if (!pci_is_root_bus(bus))
rtdid_val = (b << 8) | (d << 3) | f;
writel(rtdid_val, port->csr_base + RTDID);
/* read the register back to ensure flush */
readl(port->csr_base + RTDID);
}
/*
* X-Gene PCIe port uses BAR0-BAR1 of RC's configuration space as
* the translation from PCI bus to native BUS. Entire DDR region
* is mapped into PCIe space using these registers, so it can be
* reached by DMA from EP devices. The BAR0/1 of bridge should be
* hidden during enumeration to avoid the sizing and resource allocation
* by PCIe core.
*/
static bool xgene_pcie_hide_rc_bars(struct pci_bus *bus, int offset)
{
if (pci_is_root_bus(bus) && ((offset == PCI_BASE_ADDRESS_0) ||
(offset == PCI_BASE_ADDRESS_1)))
return true;
return false;
}
static int xgene_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct xgene_pcie_port *port = bus->sysdata;
void __iomem *addr;
if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
return PCIBIOS_DEVICE_NOT_FOUND;
if (xgene_pcie_hide_rc_bars(bus, offset)) {
*val = 0;
return PCIBIOS_SUCCESSFUL;
}
xgene_pcie_set_rtdid_reg(bus, devfn);
addr = xgene_pcie_get_cfg_base(bus);
switch (len) {
case 1:
xgene_pcie_cfg_in8(addr, offset, val);
break;
case 2:
xgene_pcie_cfg_in16(addr, offset, val);
break;
default:
xgene_pcie_cfg_in32(addr, offset, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int xgene_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct xgene_pcie_port *port = bus->sysdata;
void __iomem *addr;
if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
return PCIBIOS_DEVICE_NOT_FOUND;
if (xgene_pcie_hide_rc_bars(bus, offset))
return PCIBIOS_SUCCESSFUL;
xgene_pcie_set_rtdid_reg(bus, devfn);
addr = xgene_pcie_get_cfg_base(bus);
switch (len) {
case 1:
xgene_pcie_cfg_out8(addr, offset, (u8)val);
break;
case 2:
xgene_pcie_cfg_out16(addr, offset, (u16)val);
break;
default:
xgene_pcie_cfg_out32(addr, offset, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops xgene_pcie_ops = {
.read = xgene_pcie_read_config,
.write = xgene_pcie_write_config
};
static u64 xgene_pcie_set_ib_mask(void __iomem *csr_base, u32 addr,
u32 flags, u64 size)
{
u64 mask = (~(size - 1) & PCI_BASE_ADDRESS_MEM_MASK) | flags;
u32 val32 = 0;
u32 val;
val32 = readl(csr_base + addr);
val = (val32 & 0x0000ffff) | (lower_32_bits(mask) << 16);
writel(val, csr_base + addr);
val32 = readl(csr_base + addr + 0x04);
val = (val32 & 0xffff0000) | (lower_32_bits(mask) >> 16);
writel(val, csr_base + addr + 0x04);
val32 = readl(csr_base + addr + 0x04);
val = (val32 & 0x0000ffff) | (upper_32_bits(mask) << 16);
writel(val, csr_base + addr + 0x04);
val32 = readl(csr_base + addr + 0x08);
val = (val32 & 0xffff0000) | (upper_32_bits(mask) >> 16);
writel(val, csr_base + addr + 0x08);
return mask;
}
static void xgene_pcie_linkup(struct xgene_pcie_port *port,
u32 *lanes, u32 *speed)
{
void __iomem *csr_base = port->csr_base;
u32 val32;
port->link_up = false;
val32 = readl(csr_base + PCIECORE_CTLANDSTATUS);
if (val32 & LINK_UP_MASK) {
port->link_up = true;
*speed = PIPE_PHY_RATE_RD(val32);
val32 = readl(csr_base + BRIDGE_STATUS_0);
*lanes = val32 >> 26;
}
}
static int xgene_pcie_init_port(struct xgene_pcie_port *port)
{
int rc;
port->clk = clk_get(port->dev, NULL);
if (IS_ERR(port->clk)) {
dev_err(port->dev, "clock not available\n");
return -ENODEV;
}
rc = clk_prepare_enable(port->clk);
if (rc) {
dev_err(port->dev, "clock enable failed\n");
return rc;
}
return 0;
}
static int xgene_pcie_map_reg(struct xgene_pcie_port *port,
struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "csr");
port->csr_base = devm_ioremap_resource(port->dev, res);
if (IS_ERR(port->csr_base))
return PTR_ERR(port->csr_base);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
port->cfg_base = devm_ioremap_resource(port->dev, res);
if (IS_ERR(port->cfg_base))
return PTR_ERR(port->cfg_base);
port->cfg_addr = res->start;
return 0;
}
static void xgene_pcie_setup_ob_reg(struct xgene_pcie_port *port,
struct resource *res, u32 offset,
u64 cpu_addr, u64 pci_addr)
{
void __iomem *base = port->csr_base + offset;
resource_size_t size = resource_size(res);
u64 restype = resource_type(res);
u64 mask = 0;
u32 min_size;
u32 flag = EN_REG;
if (restype == IORESOURCE_MEM) {
min_size = SZ_128M;
} else {
min_size = 128;
flag |= OB_LO_IO;
}
if (size >= min_size)
mask = ~(size - 1) | flag;
else
dev_warn(port->dev, "res size 0x%llx less than minimum 0x%x\n",
(u64)size, min_size);
writel(lower_32_bits(cpu_addr), base);
writel(upper_32_bits(cpu_addr), base + 0x04);
writel(lower_32_bits(mask), base + 0x08);
writel(upper_32_bits(mask), base + 0x0c);
writel(lower_32_bits(pci_addr), base + 0x10);
writel(upper_32_bits(pci_addr), base + 0x14);
}
static void xgene_pcie_setup_cfg_reg(void __iomem *csr_base, u64 addr)
{
writel(lower_32_bits(addr), csr_base + CFGBARL);
writel(upper_32_bits(addr), csr_base + CFGBARH);
writel(EN_REG, csr_base + CFGCTL);
}
static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
struct list_head *res,
resource_size_t io_base)
{
struct pci_host_bridge_window *window;
struct device *dev = port->dev;
int ret;
list_for_each_entry(window, res, list) {
struct resource *res = window->res;
u64 restype = resource_type(res);
dev_dbg(port->dev, "%pR\n", res);
switch (restype) {
case IORESOURCE_IO:
xgene_pcie_setup_ob_reg(port, res, OMR3BARL, io_base,
res->start - window->offset);
ret = pci_remap_iospace(res, io_base);
if (ret < 0)
return ret;
break;
case IORESOURCE_MEM:
xgene_pcie_setup_ob_reg(port, res, OMR1BARL, res->start,
res->start - window->offset);
break;
case IORESOURCE_BUS:
break;
default:
dev_err(dev, "invalid resource %pR\n", res);
return -EINVAL;
}
}
xgene_pcie_setup_cfg_reg(port->csr_base, port->cfg_addr);
return 0;
}
static void xgene_pcie_setup_pims(void *addr, u64 pim, u64 size)
{
writel(lower_32_bits(pim), addr);
writel(upper_32_bits(pim) | EN_COHERENCY, addr + 0x04);
writel(lower_32_bits(size), addr + 0x10);
writel(upper_32_bits(size), addr + 0x14);
}
/*
* X-Gene PCIe support maximum 3 inbound memory regions
* This function helps to select a region based on size of region
*/
static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size)
{
if ((size > 4) && (size < SZ_16M) && !(*ib_reg_mask & (1 << 1))) {
*ib_reg_mask |= (1 << 1);
return 1;
}
if ((size > SZ_1K) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 0))) {
*ib_reg_mask |= (1 << 0);
return 0;
}
if ((size > SZ_1M) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 2))) {
*ib_reg_mask |= (1 << 2);
return 2;
}
return -EINVAL;
}
static void xgene_pcie_setup_ib_reg(struct xgene_pcie_port *port,
struct of_pci_range *range, u8 *ib_reg_mask)
{
void __iomem *csr_base = port->csr_base;
void __iomem *cfg_base = port->cfg_base;
void *bar_addr;
void *pim_addr;
u64 cpu_addr = range->cpu_addr;
u64 pci_addr = range->pci_addr;
u64 size = range->size;
u64 mask = ~(size - 1) | EN_REG;
u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64;
u32 bar_low;
int region;
region = xgene_pcie_select_ib_reg(ib_reg_mask, range->size);
if (region < 0) {
dev_warn(port->dev, "invalid pcie dma-range config\n");
return;
}
if (range->flags & IORESOURCE_PREFETCH)
flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
bar_low = pcie_bar_low_val((u32)cpu_addr, flags);
switch (region) {
case 0:
xgene_pcie_set_ib_mask(csr_base, BRIDGE_CFG_4, flags, size);
bar_addr = cfg_base + PCI_BASE_ADDRESS_0;
writel(bar_low, bar_addr);
writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
pim_addr = csr_base + PIM1_1L;
break;
case 1:
bar_addr = csr_base + IBAR2;
writel(bar_low, bar_addr);
writel(lower_32_bits(mask), csr_base + IR2MSK);
pim_addr = csr_base + PIM2_1L;
break;
case 2:
bar_addr = csr_base + IBAR3L;
writel(bar_low, bar_addr);
writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
writel(lower_32_bits(mask), csr_base + IR3MSKL);
writel(upper_32_bits(mask), csr_base + IR3MSKL + 0x4);
pim_addr = csr_base + PIM3_1L;
break;
}
xgene_pcie_setup_pims(pim_addr, pci_addr, ~(size - 1));
}
static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
struct device_node *node)
{
const int na = 3, ns = 2;
int rlen;
parser->node = node;
parser->pna = of_n_addr_cells(node);
parser->np = parser->pna + na + ns;
parser->range = of_get_property(node, "dma-ranges", &rlen);
if (!parser->range)
return -ENOENT;
parser->end = parser->range + rlen / sizeof(__be32);
return 0;
}
static int xgene_pcie_parse_map_dma_ranges(struct xgene_pcie_port *port)
{
struct device_node *np = port->node;
struct of_pci_range range;
struct of_pci_range_parser parser;
struct device *dev = port->dev;
u8 ib_reg_mask = 0;
if (pci_dma_range_parser_init(&parser, np)) {
dev_err(dev, "missing dma-ranges property\n");
return -EINVAL;
}
/* Get the dma-ranges from DT */
for_each_of_pci_range(&parser, &range) {
u64 end = range.cpu_addr + range.size - 1;
dev_dbg(port->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
range.flags, range.cpu_addr, end, range.pci_addr);
xgene_pcie_setup_ib_reg(port, &range, &ib_reg_mask);
}
return 0;
}
/* clear BAR configuration which was done by firmware */
static void xgene_pcie_clear_config(struct xgene_pcie_port *port)
{
int i;
for (i = PIM1_1L; i <= CFGCTL; i += 4)
writel(0x0, port->csr_base + i);
}
static int xgene_pcie_setup(struct xgene_pcie_port *port,
struct list_head *res,
resource_size_t io_base)
{
u32 val, lanes = 0, speed = 0;
int ret;
xgene_pcie_clear_config(port);
/* setup the vendor and device IDs correctly */
val = (XGENE_PCIE_DEVICEID << 16) | XGENE_PCIE_VENDORID;
writel(val, port->csr_base + BRIDGE_CFG_0);
ret = xgene_pcie_map_ranges(port, res, io_base);
if (ret)
return ret;
ret = xgene_pcie_parse_map_dma_ranges(port);
if (ret)
return ret;
xgene_pcie_linkup(port, &lanes, &speed);
if (!port->link_up)
dev_info(port->dev, "(rc) link down\n");
else
dev_info(port->dev, "(rc) x%d gen-%d link up\n",
lanes, speed + 1);
return 0;
}
static int xgene_pcie_probe_bridge(struct platform_device *pdev)
{
struct device_node *dn = pdev->dev.of_node;
struct xgene_pcie_port *port;
resource_size_t iobase = 0;
struct pci_bus *bus;
int ret;
LIST_HEAD(res);
port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->node = of_node_get(pdev->dev.of_node);
port->dev = &pdev->dev;
ret = xgene_pcie_map_reg(port, pdev);
if (ret)
return ret;
ret = xgene_pcie_init_port(port);
if (ret)
return ret;
ret = of_pci_get_host_bridge_resources(dn, 0, 0xff, &res, &iobase);
if (ret)
return ret;
ret = xgene_pcie_setup(port, &res, iobase);
if (ret)
return ret;
bus = pci_scan_root_bus(&pdev->dev, 0, &xgene_pcie_ops, port, &res);
if (!bus)
return -ENOMEM;
platform_set_drvdata(pdev, port);
return 0;
}
static const struct of_device_id xgene_pcie_match_table[] = {
{.compatible = "apm,xgene-pcie",},
{},
};
static struct platform_driver xgene_pcie_driver = {
.driver = {
.name = "xgene-pcie",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(xgene_pcie_match_table),
},
.probe = xgene_pcie_probe_bridge,
};
module_platform_driver(xgene_pcie_driver);
MODULE_AUTHOR("Tanmay Inamdar <tinamdar@apm.com>");
MODULE_DESCRIPTION("APM X-Gene PCIe driver");
MODULE_LICENSE("GPL v2");