[PATCH V4 0/8]PCI:Add SPEAr13xx PCie support

[PATCH V4 0/8]PCI:Add SPEAr13xx PCie support

[Pratyush Anand]

First three patches are improvement and fixes for SPEAr13xx support.
Patches 4-6 add miphy40lp skelten driver and support for spear1310/40 miphy
wrapper. Patch 7 add support for SPEAr13xx PCIe.

These pathes are tested with linux-3.14-rc1 with following patch on the top of
it:
Author: Balaji T K <balajitk@ti.com>
Date:   Mon Jan 20 16:41:27 2014 +0200

    ata: ahci_platform: Manage SATA PHY

Tested with SPEAr1310 evaluation board:
	- INTEL PRO 100/100 EP card
	- USB xhci gen2 card
 	- Above cards connected through LeCROY PTC switch

Modifications for SATA are tested with SPEAr1340-evb board

Changes since v3:
- Phy driver renamed to phy-miphy40lp
- ahci phy hook patch used as suggested by Arnd
- Incorporated other minor comments from v3

Changes since v2:
- Incorporated comments to move SPEAr13xx PCIe and SATA phy specific routines to
  the phy framework
- Modify ahci driver to include phy hooks
- phy-core driver modifications for subsys_initcall() 
 
Changes since v1:
- Few patches of the series are already accepted and applied to mainline e.g.
 pcie designware driver improvements,fixes for IO translation bug, PCIe dw
 driver maintainer. So dropped these from v2.
- Incorporated comment to move the common/reset PCIe code to the seperate driver
- PCIe and SATA share common PHY configuration registers, so move SATA
 platform code to the system config driver
Fourth patch is improves pcie designware driver and fixes the IO
translation bug. IO translation bug fix leads to the working of PCIe EP devices
connected to RC through switch.

PCIe driver support for SPEAr1310/40 platform board is added.

These patches are tested with SPEAr1310 evaluation board:
	- INTEL PRO 100/100 EP card
	- USB xhci gen2 card
 	- Above cards connected through LeCROY PTC switch

Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree@vger.kernel.org
Cc: linux-ide@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: spear-devel@list.st.com
Cc: linux-kernel@vger.kernel.org

Mohit Kumar (2):
  SPEAr13xx: defconfig: Update
  MAINTAINERS: Add ST SPEAr13xx PCIe driver maintainer

Pratyush Anand (6):
  clk: SPEAr13xx: Fix pcie clock name
  SPEAr13xx: Fix static mapping table
  phy: st-miphy-40lp: Add skeleton driver
  SPEAr13xx: Fixup: Move SPEAr1340 SATA platform code to phy driver
  phy: st-miphy-40lp: Add SPEAr1310 and SPEAr1340 PCIe phy support
  pcie: SPEAr13xx: Add designware pcie support

 .../devicetree/bindings/arm/spear-misc.txt         |   4 +
 .../devicetree/bindings/pci/spear13xx-pcie.txt     |   7 +
 .../devicetree/bindings/phy/st-miphy40lp.txt       |  12 +
 MAINTAINERS                                        |   6 +
 arch/arm/boot/dts/spear1310-evb.dts                |   4 +
 arch/arm/boot/dts/spear1310.dtsi                   |  96 +++-
 arch/arm/boot/dts/spear1340-evb.dts                |   4 +
 arch/arm/boot/dts/spear1340.dtsi                   |  32 +-
 arch/arm/boot/dts/spear13xx.dtsi                   |  10 +-
 arch/arm/configs/spear13xx_defconfig               |  15 +
 arch/arm/mach-spear/Kconfig                        |   3 +
 arch/arm/mach-spear/include/mach/spear.h           |   4 +-
 arch/arm/mach-spear/spear1340.c                    | 127 +----
 arch/arm/mach-spear/spear13xx.c                    |   2 +-
 drivers/clk/spear/spear1310_clock.c                |   6 +-
 drivers/clk/spear/spear1340_clock.c                |   2 +-
 drivers/pci/host/Kconfig                           |   5 +
 drivers/pci/host/Makefile                          |   1 +
 drivers/pci/host/pcie-spear13xx.c                  | 414 ++++++++++++++++
 drivers/phy/Kconfig                                |   6 +
 drivers/phy/Makefile                               |   1 +
 drivers/phy/phy-miphy40lp.c                        | 544 +++++++++++++++++++++
 22 files changed, 1166 insertions(+), 139 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/spear-misc.txt
 create mode 100644 Documentation/devicetree/bindings/pci/spear13xx-pcie.txt
 create mode 100644 Documentation/devicetree/bindings/phy/st-miphy40lp.txt
 create mode 100644 drivers/pci/host/pcie-spear13xx.c
 create mode 100644 drivers/phy/phy-miphy40lp.c

-- 
1.8.1.2

[PATCH V4 7/8] pcie: SPEAr13xx: Add designware pcie support

[Pratyush Anand]

SPEAr1310 and SPEAr1340 SOC uses designware PCIe controller. Add
SPEAr13xx PCIe driver based on designware controller driver.

SPEAr1310 has 3 PCIe ports and SPEAr1340 has 1, which are multiplexed
with ahci/sata pins. By default evaluation board of both controller
works for ahci mode.
To use these patches on SPEAr1340/1310 evaluation board, do the
necessary modifications on board and enable (okay) pcie and miphy
from respective evb dtsi file.

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Mohit Kumar <mohit.kumar@st.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Cc: spear-devel@list.st.com
Cc: linux-pci@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
---
 .../devicetree/bindings/pci/spear13xx-pcie.txt     |   7 +
 arch/arm/boot/dts/spear1310.dtsi                   |  57 +++
 arch/arm/boot/dts/spear1340.dtsi                   |  19 +
 arch/arm/boot/dts/spear13xx.dtsi                   |   5 +-
 arch/arm/configs/spear13xx_defconfig               |   2 +
 arch/arm/mach-spear/Kconfig                        |   1 +
 drivers/pci/host/Kconfig                           |   5 +
 drivers/pci/host/Makefile                          |   1 +
 drivers/pci/host/pcie-spear13xx.c                  | 414 +++++++++++++++++++++
 9 files changed, 509 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/spear13xx-pcie.txt
 create mode 100644 drivers/pci/host/pcie-spear13xx.c

diff --git a/Documentation/devicetree/bindings/pci/spear13xx-pcie.txt b/Documentation/devicetree/bindings/pci/spear13xx-pcie.txt
new file mode 100644
index 0000000..dc8ae44
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/spear13xx-pcie.txt
@@ -0,0 +1,7 @@
+Required properties:
+- compatible : should be "st,spear1340-pcie", "snps,dw-pcie".
+- pcie_is_gen1: pass <1> if forced gen1 initialization is needed to work with
+  some buggy cards else pass <0>.
+- phys		    : phandle to phy node associated with pcie controller
+- phy-names	    : must be "pcie-phy"
+- All other definitions as per generic PCI bindings
diff --git a/arch/arm/boot/dts/spear1310.dtsi b/arch/arm/boot/dts/spear1310.dtsi
index 64e7dd5..8d7aefe 100644
--- a/arch/arm/boot/dts/spear1310.dtsi
+++ b/arch/arm/boot/dts/spear1310.dtsi
@@ -83,6 +83,63 @@
 			status = "disabled";
 		};
 
+		pcie0: pcie@b1000000 {
+			compatible = "st,spear1340-pcie", "snps,dw-pcie";
+			reg = <0xb1000000 0x4000>;
+			interrupts = <0 68 0x4>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0x0 0 &gic 68>;
+			pcie_is_gen1 = <0>;
+			num-lanes = <1>;
+			phys = <&miphy0 1>;
+			phy-names = "pcie-phy";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			ranges = <0x00000800 0 0x80000000 0x80000000 0 0x00020000   /* configuration space */
+				0x81000000 0 0	 0x80020000 0 0x00010000   /* downstream I/O */
+				0x82000000 0 0x80030000 0xc0030000 0 0x0ffd0000>; /* non-prefetchable memory */
+			status = "disabled";
+		};
+
+		pcie1: pcie@b1800000 {
+			compatible = "st,spear1340-pcie", "snps,dw-pcie";
+			reg = <0xb1800000 0x4000>;
+			interrupts = <0 69 0x4>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0x0 0 &gic 69>;
+			pcie_is_gen1 = <0>;
+			num-lanes = <1>;
+			phys = <&miphy1 1>;
+			phy-names = "pcie-phy";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			ranges = <0x00000800 0 0x90000000 0x90000000 0 0x00020000   /* configuration space */
+				0x81000000 0 0  0x90020000 0 0x00010000   /* downstream I/O */
+				0x82000000 0 0x90030000 0x90030000 0 0x0ffd0000>; /* non-prefetchable memory */
+			status = "disabled";
+		};
+
+		pcie2: pcie@b4000000 {
+			compatible = "st,spear1340-pcie", "snps,dw-pcie";
+			reg = <0xb4000000 0x4000>;
+			interrupts = <0 70 0x4>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0x0 0 &gic 70>;
+			pcie_is_gen1 = <0>;
+			num-lanes = <1>;
+			phys = <&miphy2 1>;
+			phy-names = "pcie-phy";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			ranges = <0x00000800 0 0xc0000000 0xc0000000 0 0x00020000   /* configuration space */
+				0x81000000 0 0	 0xc0020000 0 0x00010000   /* downstream I/O */
+				0x82000000 0 0xc0030000 0xc0030000 0 0x0ffd0000>; /* non-prefetchable memory */
+			status = "disabled";
+		};
+
 		gmac1: eth@5c400000 {
 			compatible = "st,spear600-gmac";
 			reg = <0x5c400000 0x8000>;
diff --git a/arch/arm/boot/dts/spear1340.dtsi b/arch/arm/boot/dts/spear1340.dtsi
index 7e3a04b..4264067 100644
--- a/arch/arm/boot/dts/spear1340.dtsi
+++ b/arch/arm/boot/dts/spear1340.dtsi
@@ -49,6 +49,25 @@
 			status = "disabled";
 		};
 
+		pcie0: pcie@b1000000 {
+			compatible = "st,spear1340-pcie", "snps,dw-pcie";
+			reg = <0xb1000000 0x4000>;
+			interrupts = <0 68 0x4>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0x0 0 &gic 68>;
+			pcie_is_gen1 = <0>;
+			num-lanes = <1>;
+			phys = <&miphy0 1>;
+			phy-names = "pcie-phy";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			ranges = <0x00000800 0 0x80000000 0x80000000 0 0x00020000   /* configuration space */
+				0x81000000 0 0	 0x80020000 0 0x00010000   /* downstream I/O */
+				0x82000000 0 0x80030000 0xc0030000 0 0x0ffd0000>; /* non-prefetchable memory */
+			status = "disabled";
+		};
+
 		i2s-play@b2400000 {
 			compatible = "snps,designware-i2s";
 			reg = <0xb2400000 0x10000>;
diff --git a/arch/arm/boot/dts/spear13xx.dtsi b/arch/arm/boot/dts/spear13xx.dtsi
index 3a72508..ec7feaf 100644
--- a/arch/arm/boot/dts/spear13xx.dtsi
+++ b/arch/arm/boot/dts/spear13xx.dtsi
@@ -83,8 +83,8 @@
 		#size-cells = <1>;
 		compatible = "simple-bus";
 		ranges = <0x50000000 0x50000000 0x10000000
-			  0xb0000000 0xb0000000 0x10000000
-			  0xd0000000 0xd0000000 0x02000000
+			  0x80000000 0x80000000 0x20000000
+			  0xb0000000 0xb0000000 0x22000000
 			  0xd8000000 0xd8000000 0x01000000
 			  0xe0000000 0xe0000000 0x10000000>;
 
@@ -338,6 +338,7 @@
 				reg = <0xe07008c4 0x4>;
 				thermal_flags = <0x7000>;
 			};
+
 		};
 	};
 };
diff --git a/arch/arm/configs/spear13xx_defconfig b/arch/arm/configs/spear13xx_defconfig
index 1e0bb6f..96ede50 100644
--- a/arch/arm/configs/spear13xx_defconfig
+++ b/arch/arm/configs/spear13xx_defconfig
@@ -11,6 +11,8 @@ CONFIG_ARCH_SPEAR13XX=y
 CONFIG_MACH_SPEAR1310=y
 CONFIG_MACH_SPEAR1340=y
 # CONFIG_SWP_EMULATE is not set
+CONFIG_PCI_MSI=y
+CONFIG_PCIE_SPEAR13XX=y
 CONFIG_SMP=y
 # CONFIG_SMP_ON_UP is not set
 # CONFIG_ARM_CPU_TOPOLOGY is not set
diff --git a/arch/arm/mach-spear/Kconfig b/arch/arm/mach-spear/Kconfig
index 7e7f1b0..701b6c3 100644
--- a/arch/arm/mach-spear/Kconfig
+++ b/arch/arm/mach-spear/Kconfig
@@ -28,6 +28,7 @@ config ARCH_SPEAR13XX
 	select USE_OF
 	select MFD_SYSCON
 	select PHY_ST_MIPHY40LP
+	select PCI
 	help
 	  Supports for ARM's SPEAR13XX family
 
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 47d46c6..df52fad 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -33,4 +33,9 @@ config PCI_RCAR_GEN2
 	  There are 3 internal PCI controllers available with a single
 	  built-in EHCI/OHCI host controller present on each one.
 
+config PCIE_SPEAR13XX
+	bool "STMicroelectronics SPEAr PCIe controller"
+	depends on ARCH_SPEAR13XX
+	select PCIEPORTBUS
+	select PCIE_DW
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 13fb333..42a491d 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
 obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
 obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
 obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
+obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
new file mode 100644
index 0000000..53c6094
--- /dev/null
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -0,0 +1,414 @@
+/*
+ * PCIe host controller driver for ST Microelectronics SPEAr13xx SoCs
+ *
+ * SPEAr13xx PCIe Glue Layer Source Code
+ *
+ * Copyright (C) 2010-2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@st.com>
+ *
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-designware.h"
+
+struct spear13xx_pcie {
+	void __iomem		*app_base;
+	struct phy		*phy;
+	struct clk		*clk;
+	struct pcie_port	pp;
+	int			is_gen1;
+};
+
+struct pcie_app_reg {
+	u32	app_ctrl_0;		/*cr0*/
+	u32	app_ctrl_1;		/*cr1*/
+	u32	app_status_0;		/*cr2*/
+	u32	app_status_1;		/*cr3*/
+	u32	msg_status;		/*cr4*/
+	u32	msg_payload;		/*cr5*/
+	u32	int_sts;		/*cr6*/
+	u32	int_clr;		/*cr7*/
+	u32	int_mask;		/*cr8*/
+	u32	mst_bmisc;		/*cr9*/
+	u32	phy_ctrl;		/*cr10*/
+	u32	phy_status;		/*cr11*/
+	u32	cxpl_debug_info_0;	/*cr12*/
+	u32	cxpl_debug_info_1;	/*cr13*/
+	u32	ven_msg_ctrl_0;		/*cr14*/
+	u32	ven_msg_ctrl_1;		/*cr15*/
+	u32	ven_msg_data_0;		/*cr16*/
+	u32	ven_msg_data_1;		/*cr17*/
+	u32	ven_msi_0;		/*cr18*/
+	u32	ven_msi_1;		/*cr19*/
+	u32	mst_rmisc;		/*cr 20*/
+};
+
+/*CR0 ID*/
+#define RX_LANE_FLIP_EN_ID			0
+#define TX_LANE_FLIP_EN_ID			1
+#define SYS_AUX_PWR_DET_ID			2
+#define APP_LTSSM_ENABLE_ID			3
+#define SYS_ATTEN_BUTTON_PRESSED_ID		4
+#define SYS_MRL_SENSOR_STATE_ID			5
+#define SYS_PWR_FAULT_DET_ID			6
+#define SYS_MRL_SENSOR_CHGED_ID			7
+#define SYS_PRE_DET_CHGED_ID			8
+#define SYS_CMD_CPLED_INT_ID			9
+#define APP_INIT_RST_0_ID			11
+#define APP_REQ_ENTR_L1_ID			12
+#define APP_READY_ENTR_L23_ID			13
+#define APP_REQ_EXIT_L1_ID			14
+#define DEVICE_TYPE_EP				(0 << 25)
+#define DEVICE_TYPE_LEP				(1 << 25)
+#define DEVICE_TYPE_RC				(4 << 25)
+#define SYS_INT_ID				29
+#define MISCTRL_EN_ID				30
+#define REG_TRANSLATION_ENABLE			31
+
+/*CR1 ID*/
+#define APPS_PM_XMT_TURNOFF_ID			2
+#define APPS_PM_XMT_PME_ID			5
+
+/*CR3 ID*/
+#define XMLH_LTSSM_STATE_DETECT_QUIET		0x00
+#define XMLH_LTSSM_STATE_DETECT_ACT		0x01
+#define XMLH_LTSSM_STATE_POLL_ACTIVE		0x02
+#define XMLH_LTSSM_STATE_POLL_COMPLIANCE	0x03
+#define XMLH_LTSSM_STATE_POLL_CONFIG		0x04
+#define XMLH_LTSSM_STATE_PRE_DETECT_QUIET	0x05
+#define XMLH_LTSSM_STATE_DETECT_WAIT		0x06
+#define XMLH_LTSSM_STATE_CFG_LINKWD_START	0x07
+#define XMLH_LTSSM_STATE_CFG_LINKWD_ACEPT	0x08
+#define XMLH_LTSSM_STATE_CFG_LANENUM_WAIT	0x09
+#define XMLH_LTSSM_STATE_CFG_LANENUM_ACEPT	0x0A
+#define XMLH_LTSSM_STATE_CFG_COMPLETE		0x0B
+#define XMLH_LTSSM_STATE_CFG_IDLE		0x0C
+#define XMLH_LTSSM_STATE_RCVRY_LOCK		0x0D
+#define XMLH_LTSSM_STATE_RCVRY_SPEED		0x0E
+#define XMLH_LTSSM_STATE_RCVRY_RCVRCFG		0x0F
+#define XMLH_LTSSM_STATE_RCVRY_IDLE		0x10
+#define XMLH_LTSSM_STATE_L0			0x11
+#define XMLH_LTSSM_STATE_L0S			0x12
+#define XMLH_LTSSM_STATE_L123_SEND_EIDLE	0x13
+#define XMLH_LTSSM_STATE_L1_IDLE		0x14
+#define XMLH_LTSSM_STATE_L2_IDLE		0x15
+#define XMLH_LTSSM_STATE_L2_WAKE		0x16
+#define XMLH_LTSSM_STATE_DISABLED_ENTRY		0x17
+#define XMLH_LTSSM_STATE_DISABLED_IDLE		0x18
+#define XMLH_LTSSM_STATE_DISABLED		0x19
+#define XMLH_LTSSM_STATE_LPBK_ENTRY		0x1A
+#define XMLH_LTSSM_STATE_LPBK_ACTIVE		0x1B
+#define XMLH_LTSSM_STATE_LPBK_EXIT		0x1C
+#define XMLH_LTSSM_STATE_LPBK_EXIT_TIMEOUT	0x1D
+#define XMLH_LTSSM_STATE_HOT_RESET_ENTRY	0x1E
+#define XMLH_LTSSM_STATE_HOT_RESET		0x1F
+#define XMLH_LTSSM_STATE_MASK			0x3F
+#define XMLH_LINK_UP				(1 << 6)
+
+/*CR4 ID*/
+#define CFG_MSI_EN_ID				18
+
+/*CR6*/
+#define INTA_CTRL_INT				(1 << 7)
+#define INTB_CTRL_INT				(1 << 8)
+#define INTC_CTRL_INT				(1 << 9)
+#define INTD_CTRL_INT				(1 << 10)
+#define MSI_CTRL_INT				(1 << 26)
+
+/*CR19 ID*/
+#define VEN_MSI_REQ_ID				11
+#define VEN_MSI_FUN_NUM_ID			8
+#define VEN_MSI_TC_ID				5
+#define VEN_MSI_VECTOR_ID			0
+#define VEN_MSI_REQ_EN		((u32)0x1 << VEN_MSI_REQ_ID)
+#define VEN_MSI_FUN_NUM_MASK	((u32)0x7 << VEN_MSI_FUN_NUM_ID)
+#define VEN_MSI_TC_MASK		((u32)0x7 << VEN_MSI_TC_ID)
+#define VEN_MSI_VECTOR_MASK	((u32)0x1F << VEN_MSI_VECTOR_ID)
+
+#define PCI_CAP_ID_EXP_OFFSET			0x70
+
+#define to_spear13xx_pcie(x)	container_of(x, struct spear13xx_pcie, pp)
+
+static int spear13xx_pcie_establish_link(struct pcie_port *pp)
+{
+	u32 val;
+	int count = 0;
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+	u32 exp_cap_off = PCI_CAP_ID_EXP_OFFSET;
+
+	if (dw_pcie_link_up(pp)) {
+		dev_err(pp->dev, "Link already up\n");
+		return 0;
+	}
+
+	/* setup root complex */
+	dw_pcie_setup_rc(pp);
+
+	/*
+	 * this controller support only 128 bytes read size, however its
+	 * default value in capability register is 512 bytes. So force
+	 * it to 128 here.
+	 */
+	dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, &val);
+	val &= ~PCI_EXP_DEVCTL_READRQ;
+	dw_pcie_cfg_write(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, val);
+
+	/* program vid and did for RC */
+	dw_pcie_cfg_write(pp->dbi_base, PCI_VENDOR_ID, 2, 0x104A);
+	dw_pcie_cfg_write(pp->dbi_base, PCI_DEVICE_ID, 2, 0xCD80);
+
+	/*
+	 * if is_gen1 is set then handle it, so that some buggy card
+	 * also works
+	 */
+	if (spear13xx_pcie->is_gen1) {
+		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCAP, 4,
+				&val);
+		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+					PCI_EXP_LNKCAP, 4, val);
+		}
+
+		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCTL2, 4,
+				&val);
+		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+					PCI_EXP_LNKCTL2, 4, val);
+		}
+	}
+
+	/* enable ltssm */
+	writel(DEVICE_TYPE_RC | (1 << MISCTRL_EN_ID)
+			| (1 << APP_LTSSM_ENABLE_ID)
+			| ((u32)1 << REG_TRANSLATION_ENABLE),
+			&app_reg->app_ctrl_0);
+
+	/* check if the link is up or not */
+	while (!dw_pcie_link_up(pp)) {
+		mdelay(100);
+		count++;
+		if (count == 10) {
+			dev_err(pp->dev, "Link Fail\n");
+			return -EINVAL;
+		}
+	}
+	dev_info(pp->dev, "Link up\n");
+
+	return 0;
+}
+
+static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
+{
+	struct pcie_port *pp = arg;
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+	unsigned int status;
+
+	status = readl(&app_reg->int_sts);
+
+	if (status & MSI_CTRL_INT) {
+		if (!IS_ENABLED(CONFIG_PCI_MSI))
+			BUG();
+		dw_handle_msi_irq(pp);
+	}
+
+	writel(status, &app_reg->int_clr);
+
+	return IRQ_HANDLED;
+}
+
+static void spear13xx_pcie_enable_interrupts(struct pcie_port *pp)
+{
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+	/* Enable MSI interrupt */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		dw_pcie_msi_init(pp);
+		writel(readl(&app_reg->int_mask) |
+				MSI_CTRL_INT, &app_reg->int_mask);
+	}
+
+	return;
+}
+
+static int spear13xx_pcie_link_up(struct pcie_port *pp)
+{
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+	if (readl(&app_reg->app_status_1) & XMLH_LINK_UP)
+		return 1;
+
+	return 0;
+}
+
+static void spear13xx_pcie_host_init(struct pcie_port *pp)
+{
+	spear13xx_pcie_establish_link(pp);
+	spear13xx_pcie_enable_interrupts(pp);
+}
+
+static struct pcie_host_ops spear13xx_pcie_host_ops = {
+	.link_up = spear13xx_pcie_link_up,
+	.host_init = spear13xx_pcie_host_init,
+};
+
+static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pp->irq = platform_get_irq(pdev, 0);
+	if (!pp->irq) {
+		dev_err(dev, "failed to get irq\n");
+		return -ENODEV;
+	}
+	ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler,
+				IRQF_SHARED, "spear1340-pcie", pp);
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		return ret;
+	}
+
+	pp->root_bus_nr = -1;
+	pp->ops = &spear13xx_pcie_host_ops;
+
+	spin_lock_init(&pp->conf_lock);
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __init spear13xx_pcie_probe(struct platform_device *pdev)
+{
+	struct spear13xx_pcie *spear13xx_pcie;
+	struct pcie_port *pp;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *dbi_base;
+	int ret;
+
+	spear13xx_pcie = devm_kzalloc(dev, sizeof(*spear13xx_pcie),
+				GFP_KERNEL);
+	if (!spear13xx_pcie) {
+		dev_err(dev, "no memory for SPEAr13xx pcie\n");
+		return -ENOMEM;
+	}
+
+	spear13xx_pcie->phy = devm_phy_get(dev, "pcie-phy");
+	if (IS_ERR(spear13xx_pcie->phy)) {
+		ret = PTR_ERR(spear13xx_pcie->phy);
+		switch (ret) {
+		case -EPROBE_DEFER:
+			dev_info(dev, "probe deferred\n");
+			return ret;
+		default:
+			dev_err(dev, "couldn't get pcie-phy\n");
+			return ret;
+		}
+	}
+
+	phy_init(spear13xx_pcie->phy);
+
+	spear13xx_pcie->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(spear13xx_pcie->clk)) {
+		dev_err(dev, "couldn't get clk for pcie\n");
+		return PTR_ERR(spear13xx_pcie->clk);
+	}
+	ret = clk_prepare_enable(spear13xx_pcie->clk);
+	if (ret) {
+		dev_err(dev, "couldn't enable clk for pcie\n");
+		return ret;
+	}
+
+	pp = &spear13xx_pcie->pp;
+
+	pp->dev = dev;
+
+	dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pp->dbi_base = devm_ioremap_resource(dev, dbi_base);
+	if (IS_ERR(pp->dbi_base)) {
+		dev_err(dev, "couldn't remap dbi base\n");
+		ret = PTR_ERR(pp->dbi_base);
+		goto fail_clk;
+	}
+	spear13xx_pcie->app_base = pp->dbi_base + 0x2000;
+
+	of_property_read_u32(np, "pcie_is_gen1", &spear13xx_pcie->is_gen1);
+
+	ret = add_pcie_port(pp, pdev);
+	if (ret < 0)
+		goto fail_clk;
+
+	platform_set_drvdata(pdev, spear13xx_pcie);
+	return 0;
+
+fail_clk:
+	clk_disable_unprepare(spear13xx_pcie->clk);
+
+	return ret;
+}
+
+static int __exit spear13xx_pcie_remove(struct platform_device *pdev)
+{
+	struct spear13xx_pcie *spear13xx_pcie = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(spear13xx_pcie->clk);
+
+	phy_exit(spear13xx_pcie->phy);
+
+	return 0;
+}
+
+static const struct of_device_id spear13xx_pcie_of_match[] = {
+	{ .compatible = "st,spear1340-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, spear13xx_pcie_of_match);
+
+static struct platform_driver spear13xx_pcie_driver = {
+	.remove		= __exit_p(spear13xx_pcie_remove),
+	.driver = {
+		.name	= "spear-pcie",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(spear13xx_pcie_of_match),
+	},
+};
+
+/* SPEAr13xx PCIe driver does not allow module unload */
+
+static int __init pcie_init(void)
+{
+
+	return platform_driver_probe(&spear13xx_pcie_driver,
+				spear13xx_pcie_probe);
+}
+module_init(pcie_init);
+
+MODULE_DESCRIPTION("ST Microelectronics SPEAr13xx PCIe host controller driver");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.8.1.2

[PATCH V4 8/8] MAINTAINERS: Add ST SPEAr13xx PCIe driver maintainer

[Pratyush Anand]

From: Mohit Kumar <mohit.kumar@st.com>

Add Mohit Kumar as maintainer for ST SPEAr13xx PCIe driver.

Signed-off-by: Mohit Kumar <mohit.kumar@st.com>
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Cc: linux-pci@vger.kernel.org
---
 MAINTAINERS | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index b2cf5cf..ebdca89 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6596,6 +6596,12 @@ L:	linux-pci@vger.kernel.org
 S:	Maintained
 F:	drivers/pci/host/*designware*
 
+PCIE DRIVER FOR ST SPEAR13XX
+M:	Mohit Kumar <mohit.kumar@st.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	drivers/pci/host/pcie-spear13xx.c
+
 PCMCIA SUBSYSTEM
 P:	Linux PCMCIA Team
 L:	linux-pcmcia@lists.infradead.org
-- 
1.8.1.2

Re: [PATCH V4 0/8]PCI:Add SPEAr13xx PCie support

[Pratyush Anand]

Hi Arnd,

Do you see any more improvement in this series.

Else we will send V5 (probably the final one) with modifications for
Kishon's comment.

Regards
Pratyush

On Thu, Feb 6, 2014 at 10:14 AM, Pratyush Anand <pratyush.anand@st.com> wrote:
> First three patches are improvement and fixes for SPEAr13xx support.
> Patches 4-6 add miphy40lp skelten driver and support for spear1310/40 miphy
> wrapper. Patch 7 add support for SPEAr13xx PCIe.
>
> These pathes are tested with linux-3.14-rc1 with following patch on the top of
> it:
> Author: Balaji T K <balajitk@ti.com>
> Date:   Mon Jan 20 16:41:27 2014 +0200
>
>     ata: ahci_platform: Manage SATA PHY
>
> Tested with SPEAr1310 evaluation board:
>         - INTEL PRO 100/100 EP card
>         - USB xhci gen2 card
>         - Above cards connected through LeCROY PTC switch
>
> Modifications for SATA are tested with SPEAr1340-evb board
>
> Changes since v3:
> - Phy driver renamed to phy-miphy40lp
> - ahci phy hook patch used as suggested by Arnd
> - Incorporated other minor comments from v3
>
> Changes since v2:
> - Incorporated comments to move SPEAr13xx PCIe and SATA phy specific routines to
>   the phy framework
> - Modify ahci driver to include phy hooks
> - phy-core driver modifications for subsys_initcall()
>
> Changes since v1:
> - Few patches of the series are already accepted and applied to mainline e.g.
>  pcie designware driver improvements,fixes for IO translation bug, PCIe dw
>  driver maintainer. So dropped these from v2.
> - Incorporated comment to move the common/reset PCIe code to the seperate driver
> - PCIe and SATA share common PHY configuration registers, so move SATA
>  platform code to the system config driver
> Fourth patch is improves pcie designware driver and fixes the IO
> translation bug. IO translation bug fix leads to the working of PCIe EP devices
> connected to RC through switch.
>
> PCIe driver support for SPEAr1310/40 platform board is added.
>
> These patches are tested with SPEAr1310 evaluation board:
>         - INTEL PRO 100/100 EP card
>         - USB xhci gen2 card
>         - Above cards connected through LeCROY PTC switch
>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-ide@vger.kernel.org
> Cc: linux-pci@vger.kernel.org
> Cc: spear-devel@list.st.com
> Cc: linux-kernel@vger.kernel.org
>
> Mohit Kumar (2):
>   SPEAr13xx: defconfig: Update
>   MAINTAINERS: Add ST SPEAr13xx PCIe driver maintainer
>
> Pratyush Anand (6):
>   clk: SPEAr13xx: Fix pcie clock name
>   SPEAr13xx: Fix static mapping table
>   phy: st-miphy-40lp: Add skeleton driver
>   SPEAr13xx: Fixup: Move SPEAr1340 SATA platform code to phy driver
>   phy: st-miphy-40lp: Add SPEAr1310 and SPEAr1340 PCIe phy support
>   pcie: SPEAr13xx: Add designware pcie support
>
>  .../devicetree/bindings/arm/spear-misc.txt         |   4 +
>  .../devicetree/bindings/pci/spear13xx-pcie.txt     |   7 +
>  .../devicetree/bindings/phy/st-miphy40lp.txt       |  12 +
>  MAINTAINERS                                        |   6 +
>  arch/arm/boot/dts/spear1310-evb.dts                |   4 +
>  arch/arm/boot/dts/spear1310.dtsi                   |  96 +++-
>  arch/arm/boot/dts/spear1340-evb.dts                |   4 +
>  arch/arm/boot/dts/spear1340.dtsi                   |  32 +-
>  arch/arm/boot/dts/spear13xx.dtsi                   |  10 +-
>  arch/arm/configs/spear13xx_defconfig               |  15 +
>  arch/arm/mach-spear/Kconfig                        |   3 +
>  arch/arm/mach-spear/include/mach/spear.h           |   4 +-
>  arch/arm/mach-spear/spear1340.c                    | 127 +----
>  arch/arm/mach-spear/spear13xx.c                    |   2 +-
>  drivers/clk/spear/spear1310_clock.c                |   6 +-
>  drivers/clk/spear/spear1340_clock.c                |   2 +-
>  drivers/pci/host/Kconfig                           |   5 +
>  drivers/pci/host/Makefile                          |   1 +
>  drivers/pci/host/pcie-spear13xx.c                  | 414 ++++++++++++++++
>  drivers/phy/Kconfig                                |   6 +
>  drivers/phy/Makefile                               |   1 +
>  drivers/phy/phy-miphy40lp.c                        | 544 +++++++++++++++++++++
>  22 files changed, 1166 insertions(+), 139 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/spear-misc.txt
>  create mode 100644 Documentation/devicetree/bindings/pci/spear13xx-pcie.txt
>  create mode 100644 Documentation/devicetree/bindings/phy/st-miphy40lp.txt
>  create mode 100644 drivers/pci/host/pcie-spear13xx.c
>  create mode 100644 drivers/phy/phy-miphy40lp.c
>
> --
> 1.8.1.2
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel