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Commit 2580d48d authored by Yimin Peng's avatar Yimin Peng
Browse files

spmi: pmic_arb: add virtio spmi driver for VM platforms 



The virtio spmi-pmic frontend driver communicates with its
backend to support pmic clients virtualization.

Change-Id: I937e6ecf76dd4962654fd8b92209ff971b8f4227
Signed-off-by: default avatarYimin Peng <yiminp@codeaurora.org>
parent bacc0533

Documentation/devicetree/bindings/spmi/qcom,viospmi-pmic-arb.txt

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QTI Virtio SPMI controller (Virtio PMIC Arbiter)



The Virtio SPMI PMIC Arbiter is a frontend proxy based on backend virtio device.



Required properties:

- compatible : should be "qcom,viospmi-pmic-arb".

- #address-cells : must be set to 2

- #size-cells : must be set to 0

- interrupt-controller : boolean indicator that the PMIC arbiter is an interrupt controller

- #interrupt-cells :  must be set to 4. Interrupts are specified as a 4-tuple:

    cell 1: slave ID for the requested interrupt (0-15)

    cell 2: peripheral ID for requested interrupt (0-255)

    cell 3: the requested peripheral interrupt (0-7)

    cell 4: interrupt flags indicating level-sense information, as defined in

            dt-bindings/interrupt-controller/irq.h



Example Virtio PMIC-Arbiter:



     spmi_bus: qcom,spmi {

         compatible = "qcom,viospmi-pmic-arb";

         interrupt-names = "periph_irq";

         interrupts = <GIC_SPI 481 IRQ_TYPE_NONE>;

         qcom,ee = <0>;

         #address-cells = <2>;

         #size-cells = <0>;

         interrupt-controller;

         #interrupt-cells = <4>;

         cell-index = <0>;

     };



     viospmi: virtio-spmi@c440000 {

         compatible = "virtio,mmio";

         #address-cells = <1>;

         #size-cells = <1>;

         reg = <0xc440000 0x1100>;

         interrupts = <GIC_SPI 100 IRQ_TYPE_NONE>;

         status = "okay";

     };

drivers/spmi/Kconfig

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@@ -34,6 +34,16 @@ config SPMI_MSM_PMIC_ARB_DEBUG 
	  Inc. (QTI) MSM family processors.  This feature is available on chips

	  with PMIC arbiter version 5 and above.



config VIOSPMI_MSM_PMIC_ARB

	tristate "QTI Virtio SPMI Controller (Virtio PMIC Arbiter)"

	select IRQ_DOMAIN

	depends on ARCH_QCOM || COMPILE_TEST

	depends on HAS_IOMEM

	depends on VIRTIO

	default ARCH_QCOM

	help

	  This is virtio SPMI frontend driver for QTI MSM virtual platform.



source "drivers/spmi/simulator/Kconfig"



endif

drivers/spmi/Makefile

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@@ -5,4 +5,5 @@ obj-$(CONFIG_SPMI) += spmi.o 


obj-$(CONFIG_SPMI_MSM_PMIC_ARB)	+= spmi-pmic-arb.o

obj-$(CONFIG_SPMI_MSM_PMIC_ARB_DEBUG)	+= spmi-pmic-arb-debug.o

obj-$(CONFIG_VIOSPMI_MSM_PMIC_ARB)    += viospmi-pmic-arb.o

obj-y	+= simulator/

drivers/spmi/viospmi-pmic-arb.c

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File added.

Preview size limit exceeded, changes collapsed.

include/linux/virtio_spmi.h

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/* Copyright (c) 2019, 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 _LINUX_VIRTIO_SPMI_H

#define _LINUX_VIRTIO_SPMI_H



#include <linux/types.h>

#include <linux/virtio_ids.h>

#include <linux/virtio_config.h>

#include <linux/virtio_types.h>



/* Feature bits */

#define VIRTIO_SPMI_F_INT	1	/* Support interrupt */



#define VM_MAX_PERIPHS 512



/* Configuration layout */

struct virtio_spmi_config {

	__u16 ppid_allowed[VM_MAX_PERIPHS];

} __packed;



struct payload_cmd {

	__virtio32 data[2];

};



struct payload_irq {

	__virtio32 ppid;

	__virtio32 val;

};



union payload_data {

	struct payload_cmd cmdd;

	struct payload_irq irqd;

};



struct virtio_spmi_msg {

	__virtio32 type;

	__virtio32 len;

	__virtio32 res;

	union {

		__virtio32 cmd;

		__virtio32 cnt;

	} u;

	union payload_data payload[];

};



/* Virtio SPMI message type */

enum vio_spmi_msg_type {

	VIO_SPMI_BUS_WRITE = 0,

	VIO_SPMI_BUS_READ = 1,

	VIO_ACC_ENABLE_WR = 2,

	VIO_ACC_ENABLE_RD = 3,

	VIO_IRQ_CLEAR = 4,

	VIO_IRQ_STATUS = 5,

};



/* Virtio SPMI message type */

enum vio_spmi_msg_res {

	VIO_SPMI_DONE = 0,

	VIO_SPMI_ERR = 1,

};



/* payload fix size and one payload_data size */

#define MSG_FIX_SZ (sizeof(struct virtio_spmi_msg))

#define PER_PLD_SZ (sizeof(union payload_data))

#define MSG_SZ(x)  (MSG_FIX_SZ + ((PER_PLD_SZ) * (x)))



#endif /* _LINUX_VIRTIO_SPMI_H */