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Commit ad057477 authored by Tony Truong's avatar Tony Truong
Browse files

msm: pcie: add PCIe bus driver snapshot 



This snapshot is taken from msm-4.9 as of commit 8ff900c9004a
("msm: pcie: use PCI_ANY_ID for device ID for PCI fixup hooks").
The files have been slightly modified to correct checkpatch
style warnings.

Change-Id: If78449e9f65bb00979c0c27c9f5b0a9be88f8a0b
Signed-off-by: default avatarTony Truong <truong@codeaurora.org>
parent c92f19d6

Documentation/devicetree/bindings/pci/msm_pcie.txt

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MSM PCIe



MSM PCI express root complex



Required properties:

  - compatible: should be "qcom,pci-msm"

  - cell-index: defines root complex ID.

  - #address-cells: Should provide a value of 0.

  - reg: should contain PCIe register maps.

  - reg-names: indicates various resources passed to driver by name.

		Should be "parf", "phy", "dm_core", "elbi", "conf", "io", "bars".

		These correspond to different modules within the PCIe core.

  - ranges: For details of ranges properties, please refer to:

    "Documentation\devicetree\bindings\pci\pci.txt"

  - interrupts: Should be in the format <0 1 2> and it is an index to the

		interrupt-map that contains PCIe related interrupts.

  - #interrupt-cells: Should provide a value of 1.

  - #interrupt-map-mask: should provide a value of 0xffffffff.

  - interrupt-map:  Must create mapping for the number of interrupts

		    that are defined in above interrupts property.

		    For PCIe device node, it should define 12 mappings for

		    the corresponding PCIe interrupts supporting the specification.

  - interrupt-names: indicates interrupts passed to driver by name.

		     Should be "int_msi", "int_a", "int_b", "int_c", "int_d",

		     "int_pls_pme", "int_pme_legacy", "int_pls_err",

		     "int_aer_legacy", "int_pls_link_up",

		     "int_pls_link_down", "int_bridge_flush_n",

		     "msi_0", "msi_1", "msi_2", "msi_3",

		     "msi_4", "msi_5", "msi_6", "msi_7",

		     "msi_8", "msi_9", "msi_10", "msi_11",

		     "msi_12", "msi_13", "msi_14", "msi_15",

		     "msi_16", "msi_17", "msi_18", "msi_19",

		     "msi_20", "msi_21", "msi_22", "msi_23",

		     "msi_24", "msi_25", "msi_26", "msi_27",

		     "msi_28", "msi_29", "msi_30", "msi_31"

		     These correspond to the standard PCIe specification to support

		     MSIs, virtual IRQ's (INT#), link state notifications.

  - perst-gpio: PERST GPIO specified by PCIe spec.

  - wake-gpio: WAKE GPIO specified by PCIe spec.

  - phy-status-offset: Offset from PCIe PHY base to check if PCIe PHY is up.

  - <supply-name>-supply: phandle to the regulator device tree node.

    Refer to the schematics for the corresponding voltage regulators.

    vreg-1.8-supply: phandle to the analog supply for the PCIe controller.

    vreg-3.3-supply: phandle to the analog supply for the PCIe controller.

    vreg-0.9-supply: phandle to the analog supply for the PCIe controller.



Optional Properties:

  - qcom,<supply-name>-voltage-level: specifies voltage levels for supply.

    Should be specified in pairs (max, min, optimal), units uV.

  - clkreq-gpio: CLKREQ GPIO specified by PCIe spec.

  - qcom,ep-gpio: GPIO which enables a certain type of endpoint for link training.

  - pinctrl-names: The state name of the pin configuration.

    supports: "default", "sleep"

  - pinctrl-0: For details of pinctrl properties, please refer to:

    "Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"

  - pinctrl-1: For details of pinctrl properties, please refer to:

    "Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"

  - clocks: list of clock phandles

  - clock-names: list of names of clock inputs.

		     Should be "pcie_0_pipe_clk", "pcie_0_ref_clk_src",

				"pcie_0_aux_clk", "pcie_0_cfg_ahb_clk",

				"pcie_0_mstr_axi_clk", "pcie_0_slv_axi_clk",

				"pcie_0_ldo";

  - max-clock-frequency-hz: list of the maximum operating frequencies stored

				in the same order of clock names;

  - qcom,l0s-supported: L0s is supported.

  - qcom,l1-supported: L1 is supported.

  - qcom,l1ss-supported: L1 sub-states (L1ss) is supported.

  - qcom,aux-clk-sync: The AUX clock is synchronous to the Core clock to

    support L1ss.

  - qcom,common-clk-en: Enables the common clock configuration for the endpoint.

  - qcom,clk-power-manage-en: Enables the clock power management for the

    endpoint.

  - qcom,max-link-speed: Max Gen speed Root complex supports.

  - qcom,n-fts: The number of fast training sequences sent when the link state

    is changed from L0s to L0.

  - qcom,pcie-phy-ver: version of PCIe PHY.

  - qcom,phy-sequence: The initialization sequence to bring up the PCIe PHY.

    Should be specified in groups (offset, value, delay).

    Should be specified in groups (offset, value, delay).

  - qcom,use-19p2mhz-aux-clk: The frequency of PCIe AUX clock is 19.2MHz.

  - qcom,boot-option: Bits that alter PCIe bus driver boot sequence.

    Below details what happens when each bit is set

	BIT(0): PCIe bus driver will not start enumeration during its probe.

		Clients will control when PCIe bus driver should do enumeration.

	BIT(1): PCIe bus driver will not start enumeration if it receives a WAKE

		interrupt.

  - qcom,msi-gicm-addr: MSI address for GICv2m.

  - qcom,msi-gicm-base: MSI IRQ base for GICv2m.

  - qcom,ext-ref-clk: The reference clock is external.

  - iommus: the phandle and stream IDs for the SMMU used by this root

    complex. This should be used in separate nodes from the main root

    complex nodes, and is the only property needed in that case.

  - qcom,smmu-exist: PCIe uses a SMMU.

  - qcom,smmu-sid-base: The base SMMU SID that PCIe bus driver will use to calculate

    and assign for each endpoint.

  - qcom,ep-latency: The time (unit: ms) to wait for the PCIe endpoint to become

    stable after power on, before de-assert the PERST to the endpoint.

  - qcom,switch-latency: The time (unit: ms) to wait for the PCIe endpoint's link

    training with switch downstream port after the link between switch upstream

    port and RC is up.

  - qcom,wr-halt-size: With base 2, this exponent determines the size of the

    data that PCIe core will halt on for each write transaction.

  - qcom,slv-addr-space-size: The memory space size of PCIe Root Complex.

  - qcom,cpl-timeout: Completion timeout value. This value specifies the time range

    which the root complex will send out a completion packet if there is no response

    from the endpoint.

  - linux,pci-domain: For details of pci-domains properties, please refer to:

    "Documentation/devicetree/bindings/pci/pci.txt"

  - qcom,perst-delay-us-min: The minimum allowed time (unit: us) to sleep after

    asserting or de-asserting PERST GPIO.

  - qcom,perst-delay-us-max: The maximum allowed time (unit: us) to sleep after

    asserting or de-asserting PERST GPIO.

  - qcom,tlp-rd-size: The max TLP read size (Calculation: 128 times 2 to the

    tlp-rd-size power).

  - Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for

    below optional properties:

	- qcom,msm-bus,name

	- qcom,msm-bus,num-cases

	- qcom,msm-bus,num-paths

	- qcom,msm-bus,vectors-KBps

  - qcom,scm-dev-id: If present then device id value is passed to secure channel

	manager(scm) driver. scm driver uses this device id to restore PCIe

	controller related security configuration after coming out of the controller

	power collapse.

  - resets: reset specifier pair consists of phandle for the reset controller

    and reset lines used by this controller.

  - reset-names: reset signal name strings sorted in the same order as the resets

    property.



Example:



	pcie0: qcom,pcie@fc520000 {

		compatible = "qcom,msm_pcie";

		cell-index = <0>;

		#address-cells = <0>;

		reg = <0xfc520000 0x2000>,

		      <0xfc526000 0x1000>,

		      <0xff000000 0x1000>,

		      <0xff001000 0x1000>,

		      <0xff100000 0x1000>,

		      <0xff200000 0x100000>,

		      <0xff300000 0xd00000>;

		reg-names = "parf", "dm_core", "elbi",

				"conf", "io", "bars";

		ranges = <0x01000000 0x0 0x0c200000 0x0c200000 0x0 0x100000>,

			<0x02000000 0x0 0x0c300000 0x0c300000 0x0 0xd00000>;

		interrupt-parent = <&pcie0>;

		interrupts = <0 1 2 3 4 5 6 7 8 9 10 11

				12 13 14 15 16 17 18 19 20

				21 22 23 24 25 26 27 28 29

				30 31 32 33 34 35 36 37 38

				39 40 41 42 43>;

		#interrupt-cells = <1>;

		interrupt-map-mask = <0xffffffff>;

		interrupt-map = <0x0 0x0 0x0 0 &intc 0 405 0

				0x0 0x0 0x0 1 &intc 0 244 0

				0x0 0x0 0x0 2 &intc 0 245 0

				0x0 0x0 0x0 3 &intc 0 247 0

				0x0 0x0 0x0 4 &intc 0 248 0

				0x0 0x0 0x0 5 &intc 0 249 0

				0x0 0x0 0x0 6 &intc 0 250 0

				0x0 0x0 0x0 7 &intc 0 251 0

				0x0 0x0 0x0 8 &intc 0 252 0

				0x0 0x0 0x0 9 &intc 0 253 0

				0x0 0x0 0x0 10 &intc 0 254 0

				0x0 0x0 0x0 11 &intc 0 255 0

				0x0 0x0 0x0 12 &intc 0 448 0

				0x0 0x0 0x0 13 &intc 0 449 0

				0x0 0x0 0x0 14 &intc 0 450 0

				0x0 0x0 0x0 15 &intc 0 451 0

				0x0 0x0 0x0 16 &intc 0 452 0

				0x0 0x0 0x0 17 &intc 0 453 0

				0x0 0x0 0x0 18 &intc 0 454 0

				0x0 0x0 0x0 19 &intc 0 455 0

				0x0 0x0 0x0 20 &intc 0 456 0

				0x0 0x0 0x0 21 &intc 0 457 0

				0x0 0x0 0x0 22 &intc 0 458 0

				0x0 0x0 0x0 23 &intc 0 459 0

				0x0 0x0 0x0 24 &intc 0 460 0

				0x0 0x0 0x0 25 &intc 0 461 0

				0x0 0x0 0x0 26 &intc 0 462 0

				0x0 0x0 0x0 27 &intc 0 463 0

				0x0 0x0 0x0 28 &intc 0 464 0

				0x0 0x0 0x0 29 &intc 0 465 0

				0x0 0x0 0x0 30 &intc 0 466 0

				0x0 0x0 0x0 31 &intc 0 467 0

				0x0 0x0 0x0 32 &intc 0 468 0

				0x0 0x0 0x0 33 &intc 0 469 0

				0x0 0x0 0x0 34 &intc 0 470 0

				0x0 0x0 0x0 35 &intc 0 471 0

				0x0 0x0 0x0 36 &intc 0 472 0

				0x0 0x0 0x0 37 &intc 0 473 0

				0x0 0x0 0x0 38 &intc 0 474 0

				0x0 0x0 0x0 39 &intc 0 475 0

				0x0 0x0 0x0 40 &intc 0 476 0

				0x0 0x0 0x0 41 &intc 0 477 0

				0x0 0x0 0x0 42 &intc 0 478 0

				0x0 0x0 0x0 43 &intc 0 479 0>;

		interrupt-names = "int_msi", "int_a", "int_b", "int_c", "int_d",

				"int_pls_pme", "int_pme_legacy", "int_pls_err",

				"int_aer_legacy", "int_pls_link_up",

				"int_pls_link_down", "int_bridge_flush_n",

				"msi_0", "msi_1", "msi_2", "msi_3",

				"msi_4", "msi_5", "msi_6", "msi_7",

				"msi_8", "msi_9", "msi_10", "msi_11",

				"msi_12", "msi_13", "msi_14", "msi_15",

				"msi_16", "msi_17", "msi_18", "msi_19",

				"msi_20", "msi_21", "msi_22", "msi_23",

				"msi_24", "msi_25", "msi_26", "msi_27",

				"msi_28", "msi_29", "msi_30", "msi_31";



		qcom,phy-sequence = <0x804 0x01 0x00

					0x034 0x14 0x00

					0x138 0x30 0x00

					0x048 0x0f 0x00

					0x15c 0x06 0x00

					0x090 0x01 0x00

					0x808 0x03 0x00>;

		perst-gpio = <&msmgpio 70 0>;

		wake-gpio = <&msmgpio 69 0>;

		clkreq-gpio = <&msmgpio 68 0>;

		qcom,ep-gpio = <&tlmm 94 0>;



		gdsc-vdd-supply = <&gdsc_pcie_0>;

		vreg-1.8-supply = <&pma8084_l12>;

		vreg-0.9-supply = <&pma8084_l4>;

		vreg-3.3-supply = <&wlan_vreg>;



		qcom,vreg-1.8-voltage-level = <1800000 1800000 1000>;

		qcom,vreg-0.9-voltage-level = <950000 950000 24000>;



		pinctrl-names = "default", "sleep";

		pinctrl-0 = <&pcie0_clkreq_default &pcie0_perst_default &pcie0_wake_default>;

		pinctrl-1 = <&pcie0_clkreq_sleep &pcie0_perst_sleep &pcie0_wake_sleep>;



		clocks = <&clock_gcc clk_gcc_pcie_0_pipe_clk>,

			<&clock_rpm clk_ln_bb_clk>,

			<&clock_gcc clk_gcc_pcie_0_aux_clk>,

			<&clock_gcc clk_gcc_pcie_0_cfg_ahb_clk>,

			<&clock_gcc clk_gcc_pcie_0_mstr_axi_clk>,

			<&clock_gcc clk_gcc_pcie_0_slv_axi_clk>,

			<&clock_gcc clk_pcie_0_phy_ldo>;



		clock-names = "pcie_0_pipe_clk", "pcie_0_ref_clk_src",

				"pcie_0_aux_clk", "pcie_0_cfg_ahb_clk",

				"pcie_0_mstr_axi_clk", "pcie_0_slv_axi_clk",

				"pcie_0_ldo";



		resets = <&clock_gcc GCC_PCIE_PHY_BCR>,

			<&clock_gcc GCC_PCIE_PHY_COM_BCR>,

			<&clock_gcc GCC_PCIE_PHY_NOCSR_COM_PHY_BCR>,

			<&clock_gcc GCC_PCIE_0_PHY_BCR>;



		reset-names = "pcie_phy_reset", "pcie_phy_com_reset",

				"pcie_phy_nocsr_com_phy_reset","pcie_0_phy_reset";



		max-clock-frequency-hz = <125000000>, <0>, <1000000>,

						<0>, <0>, <0>, <0>;

		qcom,l0s-supported;

		qcom,l1-supported;

		qcom,l1ss-supported;

		qcom,aux-clk-sync;

		qcom,max-link-speed = <0x2>;

		qcom,n-fts = <0x50>;

		qcom,pcie-phy-ver = <1>;

		qcom,boot-option = <0x1>;

		qcom,msi-gicm-addr = <0xf9040040>;

		qcom,msi-gicm-base = <0x160>;

		qcom,ext-ref-clk;

		qcom,tlp-rd-size = <0x5>;

		qcom,smmu-exist;

		qcom,smmu-sid-base = <0x1480>;

		qcom,ep-latency = <100>;

		qcom,switch-latency = <100>;

		qcom,wr-halt-size = <0xa>; /* 1KB */

		qcom,slv-addr-space-size = <0x1000000>; /* 16MB */

		qcom,phy-status-offset = <0x800>;

		qcom,cpl-timeout = <0x2>;



		iommus = <&anoc0_smmu>;



		qcom,msm-bus,name = "pcie0";

		qcom,msm-bus,num-cases = <2>;

		qcom,msm-bus,num-paths = <1>;

		qcom,msm-bus,vectors-KBps =

				<45 512 0 0>,

				<45 512 500 800>;



		qcom,scm-dev-id = <11>;

	};

drivers/pci/host/pci-msm.c

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include/linux/msm_pcie.h

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/* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * 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.

 */



#ifndef __MSM_PCIE_H

#define __MSM_PCIE_H



#include <linux/types.h>

#include <linux/pci.h>



enum msm_pcie_config {

	MSM_PCIE_CONFIG_INVALID = 0,

	MSM_PCIE_CONFIG_NO_CFG_RESTORE = 0x1,

	MSM_PCIE_CONFIG_LINKDOWN = 0x2,

	MSM_PCIE_CONFIG_NO_RECOVERY = 0x4,

};



enum msm_pcie_pm_opt {

	MSM_PCIE_SUSPEND,

	MSM_PCIE_RESUME,

	MSM_PCIE_DISABLE_PC,

	MSM_PCIE_ENABLE_PC,

};



enum msm_pcie_event {

	MSM_PCIE_EVENT_INVALID = 0,

	MSM_PCIE_EVENT_LINKDOWN = 0x1,

	MSM_PCIE_EVENT_LINKUP = 0x2,

	MSM_PCIE_EVENT_WAKEUP = 0x4,

};



enum msm_pcie_trigger {

	MSM_PCIE_TRIGGER_CALLBACK,

	MSM_PCIE_TRIGGER_COMPLETION,

};



struct msm_pcie_notify {

	enum msm_pcie_event event;

	void *user;

	void *data;

	u32 options;

};



struct msm_pcie_register_event {

	u32 events;

	void *user;

	enum msm_pcie_trigger mode;

	void (*callback)(struct msm_pcie_notify *notify);

	struct msm_pcie_notify notify;

	struct completion *completion;

	u32 options;

};



#ifdef CONFIG_PCI_MSM

/**

 * msm_pcie_pm_control - control the power state of a PCIe link.

 * @pm_opt:	power management operation

 * @busnr:	bus number of PCIe endpoint

 * @user:	handle of the caller

 * @data:	private data from the caller

 * @options:	options for pm control

 *

 * This function gives PCIe endpoint device drivers the control to change

 * the power state of a PCIe link for their device.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_pm_control(enum msm_pcie_pm_opt pm_opt, u32 busnr, void *user,

			void *data, u32 options);



/**

 * msm_pcie_register_event - register an event with PCIe bus driver.

 * @reg:	event structure

 *

 * This function gives PCIe endpoint device drivers an option to register

 * events with PCIe bus driver.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_register_event(struct msm_pcie_register_event *reg);



/**

 * msm_pcie_deregister_event - deregister an event with PCIe bus driver.

 * @reg:	event structure

 *

 * This function gives PCIe endpoint device drivers an option to deregister

 * events with PCIe bus driver.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_deregister_event(struct msm_pcie_register_event *reg);



/**

 * msm_pcie_recover_config - recover config space.

 * @dev:	pci device structure

 *

 * This function recovers the config space of both RC and Endpoint.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_recover_config(struct pci_dev *dev);



/**

 * msm_pcie_enumerate - enumerate Endpoints.

 * @rc_idx:	RC that Endpoints connect to.

 *

 * This function enumerates Endpoints connected to RC.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_enumerate(u32 rc_idx);



/**

 * msm_pcie_recover_config - recover config space.

 * @dev:	pci device structure

 *

 * This function recovers the config space of both RC and Endpoint.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_recover_config(struct pci_dev *dev);



/**

 * msm_pcie_shadow_control - control the shadowing of PCIe config space.

 * @dev:	pci device structure

 * @enable:	shadowing should be enabled or disabled

 *

 * This function gives PCIe endpoint device drivers the control to enable

 * or disable the shadowing of PCIe config space.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_shadow_control(struct pci_dev *dev, bool enable);



/*

 * msm_pcie_debug_info - run a PCIe specific debug testcase.

 * @dev:	pci device structure

 * @option:	specifies which PCIe debug testcase to execute

 * @base:	PCIe specific range

 * @offset:	offset of destination register

 * @mask:	mask the bit(s) of destination register

 * @value:	value to be written to destination register

 *

 * This function gives PCIe endpoint device drivers the control to

 * run a debug testcase.

 *

 * Return: 0 on success, negative value on error

 */

int msm_pcie_debug_info(struct pci_dev *dev, u32 option, u32 base,

			u32 offset, u32 mask, u32 value);



#else /* !CONFIG_PCI_MSM */

static inline int msm_pcie_pm_control(enum msm_pcie_pm_opt pm_opt, u32 busnr,

			void *user, void *data, u32 options)

{

	return -ENODEV;

}



static inline int msm_pcie_register_event(struct msm_pcie_register_event *reg)

{

	return -ENODEV;

}



static inline int msm_pcie_deregister_event(struct msm_pcie_register_event *reg)

{

	return -ENODEV;

}



static inline int msm_pcie_recover_config(struct pci_dev *dev)

{

	return -ENODEV;

}



static inline int msm_pcie_enumerate(u32 rc_idx)

{

	return -ENODEV;

}



static inline int msm_pcie_shadow_control(struct pci_dev *dev, bool enable)

{

	return -ENODEV;

}



static inline int msm_pcie_debug_info(struct pci_dev *dev, u32 option, u32 base,

			u32 offset, u32 mask, u32 value)

{

	return -ENODEV;

}

#endif /* CONFIG_PCI_MSM */



#endif /* __MSM_PCIE_H */