Commit 61e19ba9 authored by Andy Gross's avatar Andy Gross

Merge tag 'qcom-soc-for-4.3' into v4.2-rc2

Qualcomm ARM Based SoC Updates for 4.3

* Add SMEM driver
* Add SMD driver
* Add RPM over SMD driver
* Select QCOM_SCM by default
parents bc0195aa ba68227e
Qualcomm Resource Power Manager (RPM) over SMD
This driver is used to interface with the Resource Power Manager (RPM) found in
various Qualcomm platforms. The RPM allows each component in the system to vote
for state of the system resources, such as clocks, regulators and bus
frequencies.
- compatible:
Usage: required
Value type: <string>
Definition: must be one of:
"qcom,rpm-msm8974"
- qcom,smd-channels:
Usage: required
Value type: <stringlist>
Definition: Shared Memory channel used for communication with the RPM
= SUBDEVICES
The RPM exposes resources to its subnodes. The below bindings specify the set
of valid subnodes that can operate on these resources.
== Regulators
Regulator nodes are identified by their compatible:
- compatible:
Usage: required
Value type: <string>
Definition: must be one of:
"qcom,rpm-pm8841-regulators"
"qcom,rpm-pm8941-regulators"
- vdd_s1-supply:
- vdd_s2-supply:
- vdd_s3-supply:
- vdd_s4-supply:
- vdd_s5-supply:
- vdd_s6-supply:
- vdd_s7-supply:
- vdd_s8-supply:
Usage: optional (pm8841 only)
Value type: <phandle>
Definition: reference to regulator supplying the input pin, as
described in the data sheet
- vdd_s1-supply:
- vdd_s2-supply:
- vdd_s3-supply:
- vdd_l1_l3-supply:
- vdd_l2_lvs1_2_3-supply:
- vdd_l4_l11-supply:
- vdd_l5_l7-supply:
- vdd_l6_l12_l14_l15-supply:
- vdd_l8_l16_l18_l19-supply:
- vdd_l9_l10_l17_l22-supply:
- vdd_l13_l20_l23_l24-supply:
- vdd_l21-supply:
- vin_5vs-supply:
Usage: optional (pm8941 only)
Value type: <phandle>
Definition: reference to regulator supplying the input pin, as
described in the data sheet
The regulator node houses sub-nodes for each regulator within the device. Each
sub-node is identified using the node's name, with valid values listed for each
of the pmics below.
pm8841:
s1, s2, s3, s4, s5, s6, s7, s8
pm8941:
s1, s2, s3, s4, l1, l2, l3, l4, l5, l6, l7, l8, l9, l10, l11, l12, l13,
l14, l15, l16, l17, l18, l19, l20, l21, l22, l23, l24, lvs1, lvs2,
lvs3, 5vs1, 5vs2
The content of each sub-node is defined by the standard binding for regulators -
see regulator.txt.
= EXAMPLE
smd {
compatible = "qcom,smd";
rpm {
interrupts = <0 168 1>;
qcom,ipc = <&apcs 8 0>;
qcom,smd-edge = <15>;
rpm_requests {
compatible = "qcom,rpm-msm8974";
qcom,smd-channels = "rpm_requests";
pm8941-regulators {
compatible = "qcom,rpm-pm8941-regulators";
vdd_l13_l20_l23_l24-supply = <&pm8941_boost>;
pm8941_s3: s3 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
};
pm8941_boost: s4 {
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
};
pm8941_l20: l20 {
regulator-min-microvolt = <2950000>;
regulator-max-microvolt = <2950000>;
};
};
};
};
};
Qualcomm Shared Memory Driver (SMD) binding
This binding describes the Qualcomm Shared Memory Driver, a fifo based
communication channel for sending data between the various subsystems in
Qualcomm platforms.
- compatible:
Usage: required
Value type: <stringlist>
Definition: must be "qcom,smd"
= EDGES
Each subnode of the SMD node represents a remote subsystem or a remote
processor of some sort - or in SMD language an "edge". The name of the edges
are not important.
The edge is described by the following properties:
- interrupts:
Usage: required
Value type: <prop-encoded-array>
Definition: should specify the IRQ used by the remote processor to
signal this processor about communication related updates
- qcom,ipc:
Usage: required
Value type: <prop-encoded-array>
Definition: three entries specifying the outgoing ipc bit used for
signaling the remote processor:
- phandle to a syscon node representing the apcs registers
- u32 representing offset to the register within the syscon
- u32 representing the ipc bit within the register
- qcom,smd-edge:
Usage: required
Value type: <u32>
Definition: the identifier of the remote processor in the smd channel
allocation table
= SMD DEVICES
In turn, subnodes of the "edges" represent devices tied to SMD channels on that
"edge". The names of the devices are not important. The properties of these
nodes are defined by the individual bindings for the SMD devices - but must
contain the following property:
- qcom,smd-channels:
Usage: required
Value type: <stringlist>
Definition: a list of channels tied to this device, used for matching
the device to channels
= EXAMPLE
The following example represents a smd node, with one edge representing the
"rpm" subsystem. For the "rpm" subsystem we have a device tied to the
"rpm_request" channel.
apcs: syscon@f9011000 {
compatible = "syscon";
reg = <0xf9011000 0x1000>;
};
smd {
compatible = "qcom,smd";
rpm {
interrupts = <0 168 1>;
qcom,ipc = <&apcs 8 0>;
qcom,smd-edge = <15>;
rpm_requests {
compatible = "qcom,rpm-msm8974";
qcom,smd-channels = "rpm_requests";
...
};
};
};
......@@ -13,7 +13,38 @@ config QCOM_GSBI
config QCOM_PM
bool "Qualcomm Power Management"
depends on ARCH_QCOM && !ARM64
select QCOM_SCM
help
QCOM Platform specific power driver to manage cores and L2 low power
modes. It interface with various system drivers to put the cores in
low power modes.
config QCOM_SMD
tristate "Qualcomm Shared Memory Driver (SMD)"
depends on QCOM_SMEM
help
Say y here to enable support for the Qualcomm Shared Memory Driver
providing communication channels to remote processors in Qualcomm
platforms.
config QCOM_SMD_RPM
tristate "Qualcomm Resource Power Manager (RPM) over SMD"
depends on QCOM_SMD && OF
help
If you say yes to this option, support will be included for the
Resource Power Manager system found in the Qualcomm 8974 based
devices.
This is required to access many regulators, clocks and bus
frequencies controlled by the RPM on these devices.
Say M here if you want to include support for the Qualcomm RPM as a
module. This will build a module called "qcom-smd-rpm".
config QCOM_SMEM
tristate "Qualcomm Shared Memory Manager (SMEM)"
depends on ARCH_QCOM
help
Say y here to enable support for the Qualcomm Shared Memory Manager.
The driver provides an interface to items in a heap shared among all
processors in a Qualcomm platform.
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_PM) += spm.o
obj-$(CONFIG_QCOM_SMD) += smd.o
obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
obj-$(CONFIG_QCOM_SMEM) += smem.o
/*
* Copyright (c) 2015, Sony Mobile Communications AB.
* Copyright (c) 2012-2013, 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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/soc/qcom/smd.h>
#include <linux/soc/qcom/smd-rpm.h>
#define RPM_REQUEST_TIMEOUT (5 * HZ)
/**
* struct qcom_smd_rpm - state of the rpm device driver
* @rpm_channel: reference to the smd channel
* @ack: completion for acks
* @lock: mutual exclusion around the send/complete pair
* @ack_status: result of the rpm request
*/
struct qcom_smd_rpm {
struct qcom_smd_channel *rpm_channel;
struct completion ack;
struct mutex lock;
int ack_status;
};
/**
* struct qcom_rpm_header - header for all rpm requests and responses
* @service_type: identifier of the service
* @length: length of the payload
*/
struct qcom_rpm_header {
u32 service_type;
u32 length;
};
/**
* struct qcom_rpm_request - request message to the rpm
* @msg_id: identifier of the outgoing message
* @flags: active/sleep state flags
* @type: resource type
* @id: resource id
* @data_len: length of the payload following this header
*/
struct qcom_rpm_request {
u32 msg_id;
u32 flags;
u32 type;
u32 id;
u32 data_len;
};
/**
* struct qcom_rpm_message - response message from the rpm
* @msg_type: indicator of the type of message
* @length: the size of this message, including the message header
* @msg_id: message id
* @message: textual message from the rpm
*
* Multiple of these messages can be stacked in an rpm message.
*/
struct qcom_rpm_message {
u32 msg_type;
u32 length;
union {
u32 msg_id;
u8 message[0];
};
};
#define RPM_SERVICE_TYPE_REQUEST 0x00716572 /* "req\0" */
#define RPM_MSG_TYPE_ERR 0x00727265 /* "err\0" */
#define RPM_MSG_TYPE_MSG_ID 0x2367736d /* "msg#" */
/**
* qcom_rpm_smd_write - write @buf to @type:@id
* @rpm: rpm handle
* @type: resource type
* @id: resource identifier
* @buf: the data to be written
* @count: number of bytes in @buf
*/
int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
int state,
u32 type, u32 id,
void *buf,
size_t count)
{
static unsigned msg_id = 1;
int left;
int ret;
struct {
struct qcom_rpm_header hdr;
struct qcom_rpm_request req;
u8 payload[count];
} pkt;
/* SMD packets to the RPM may not exceed 256 bytes */
if (WARN_ON(sizeof(pkt) >= 256))
return -EINVAL;
mutex_lock(&rpm->lock);
pkt.hdr.service_type = RPM_SERVICE_TYPE_REQUEST;
pkt.hdr.length = sizeof(struct qcom_rpm_request) + count;
pkt.req.msg_id = msg_id++;
pkt.req.flags = BIT(state);
pkt.req.type = type;
pkt.req.id = id;
pkt.req.data_len = count;
memcpy(pkt.payload, buf, count);
ret = qcom_smd_send(rpm->rpm_channel, &pkt, sizeof(pkt));
if (ret)
goto out;
left = wait_for_completion_timeout(&rpm->ack, RPM_REQUEST_TIMEOUT);
if (!left)
ret = -ETIMEDOUT;
else
ret = rpm->ack_status;
out:
mutex_unlock(&rpm->lock);
return ret;
}
EXPORT_SYMBOL(qcom_rpm_smd_write);
static int qcom_smd_rpm_callback(struct qcom_smd_device *qsdev,
const void *data,
size_t count)
{
const struct qcom_rpm_header *hdr = data;
const struct qcom_rpm_message *msg;
struct qcom_smd_rpm *rpm = dev_get_drvdata(&qsdev->dev);
const u8 *buf = data + sizeof(struct qcom_rpm_header);
const u8 *end = buf + hdr->length;
char msgbuf[32];
int status = 0;
u32 len;
if (hdr->service_type != RPM_SERVICE_TYPE_REQUEST ||
hdr->length < sizeof(struct qcom_rpm_message)) {
dev_err(&qsdev->dev, "invalid request\n");
return 0;
}
while (buf < end) {
msg = (struct qcom_rpm_message *)buf;
switch (msg->msg_type) {
case RPM_MSG_TYPE_MSG_ID:
break;
case RPM_MSG_TYPE_ERR:
len = min_t(u32, ALIGN(msg->length, 4), sizeof(msgbuf));
memcpy_fromio(msgbuf, msg->message, len);
msgbuf[len - 1] = 0;
if (!strcmp(msgbuf, "resource does not exist"))
status = -ENXIO;
else
status = -EINVAL;
break;
}
buf = PTR_ALIGN(buf + 2 * sizeof(u32) + msg->length, 4);
}
rpm->ack_status = status;
complete(&rpm->ack);
return 0;
}
static int qcom_smd_rpm_probe(struct qcom_smd_device *sdev)
{
struct qcom_smd_rpm *rpm;
rpm = devm_kzalloc(&sdev->dev, sizeof(*rpm), GFP_KERNEL);
if (!rpm)
return -ENOMEM;
mutex_init(&rpm->lock);
init_completion(&rpm->ack);
rpm->rpm_channel = sdev->channel;
dev_set_drvdata(&sdev->dev, rpm);
return of_platform_populate(sdev->dev.of_node, NULL, NULL, &sdev->dev);
}
static void qcom_smd_rpm_remove(struct qcom_smd_device *sdev)
{
of_platform_depopulate(&sdev->dev);
}
static const struct of_device_id qcom_smd_rpm_of_match[] = {
{ .compatible = "qcom,rpm-msm8974" },
{}
};
MODULE_DEVICE_TABLE(of, qcom_smd_rpm_of_match);
static struct qcom_smd_driver qcom_smd_rpm_driver = {
.probe = qcom_smd_rpm_probe,
.remove = qcom_smd_rpm_remove,
.callback = qcom_smd_rpm_callback,
.driver = {
.name = "qcom_smd_rpm",
.owner = THIS_MODULE,
.of_match_table = qcom_smd_rpm_of_match,
},
};
static int __init qcom_smd_rpm_init(void)
{
return qcom_smd_driver_register(&qcom_smd_rpm_driver);
}
arch_initcall(qcom_smd_rpm_init);
static void __exit qcom_smd_rpm_exit(void)
{
qcom_smd_driver_unregister(&qcom_smd_rpm_driver);
}
module_exit(qcom_smd_rpm_exit);
MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
MODULE_DESCRIPTION("Qualcomm SMD backed RPM driver");
MODULE_LICENSE("GPL v2");
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#ifndef __QCOM_SMD_RPM_H__
#define __QCOM_SMD_RPM_H__
struct qcom_smd_rpm;
#define QCOM_SMD_RPM_ACTIVE_STATE 0
#define QCOM_SMD_RPM_SLEEP_STATE 1
/*
* Constants used for addressing resources in the RPM.
*/
#define QCOM_SMD_RPM_BOOST 0x61747362
#define QCOM_SMD_RPM_BUS_CLK 0x316b6c63
#define QCOM_SMD_RPM_BUS_MASTER 0x73616d62
#define QCOM_SMD_RPM_BUS_SLAVE 0x766c7362
#define QCOM_SMD_RPM_CLK_BUF_A 0x616B6C63
#define QCOM_SMD_RPM_LDOA 0x616f646c
#define QCOM_SMD_RPM_LDOB 0x626F646C
#define QCOM_SMD_RPM_MEM_CLK 0x326b6c63
#define QCOM_SMD_RPM_MISC_CLK 0x306b6c63
#define QCOM_SMD_RPM_NCPA 0x6170636E
#define QCOM_SMD_RPM_NCPB 0x6270636E
#define QCOM_SMD_RPM_OCMEM_PWR 0x706d636f
#define QCOM_SMD_RPM_QPIC_CLK 0x63697071
#define QCOM_SMD_RPM_SMPA 0x61706d73
#define QCOM_SMD_RPM_SMPB 0x62706d73
#define QCOM_SMD_RPM_SPDM 0x63707362
#define QCOM_SMD_RPM_VSA 0x00617376
int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
int state,
u32 resource_type, u32 resource_id,
void *buf, size_t count);
#endif
#ifndef __QCOM_SMD_H__
#define __QCOM_SMD_H__
#include <linux/device.h>
#include <linux/mod_devicetable.h>
struct qcom_smd;
struct qcom_smd_channel;
struct qcom_smd_lookup;
/**
* struct qcom_smd_device - smd device struct
* @dev: the device struct
* @channel: handle to the smd channel for this device
*/
struct qcom_smd_device {
struct device dev;
struct qcom_smd_channel *channel;
};
/**
* struct qcom_smd_driver - smd driver struct
* @driver: underlying device driver
* @probe: invoked when the smd channel is found
* @remove: invoked when the smd channel is closed
* @callback: invoked when an inbound message is received on the channel,
* should return 0 on success or -EBUSY if the data cannot be
* consumed at this time
*/
struct qcom_smd_driver {
struct device_driver driver;
int (*probe)(struct qcom_smd_device *dev);
void (*remove)(struct qcom_smd_device *dev);
int (*callback)(struct qcom_smd_device *, const void *, size_t);
};
int qcom_smd_driver_register(struct qcom_smd_driver *drv);
void qcom_smd_driver_unregister(struct qcom_smd_driver *drv);
#define module_qcom_smd_driver(__smd_driver) \
module_driver(__smd_driver, qcom_smd_driver_register, \
qcom_smd_driver_unregister)
int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);
#endif
#ifndef __QCOM_SMEM_H__
#define __QCOM_SMEM_H__
#define QCOM_SMEM_HOST_ANY -1
int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size);
int qcom_smem_get_free_space(unsigned host);
#endif
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