linux/drivers/mailbox/qcom-apcs-ipc-mailbox.c
Thomas Gleixner 97fb5e8d9b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 294 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

149 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017, Linaro Ltd
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mailbox_controller.h>
#define QCOM_APCS_IPC_BITS 32
struct qcom_apcs_ipc {
struct mbox_controller mbox;
struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];
struct regmap *regmap;
unsigned long offset;
struct platform_device *clk;
};
static const struct regmap_config apcs_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x1000,
.fast_io = true,
};
static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
{
struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
struct qcom_apcs_ipc, mbox);
unsigned long idx = (unsigned long)chan->con_priv;
return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
}
static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
.send_data = qcom_apcs_ipc_send_data,
};
static int qcom_apcs_ipc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct qcom_apcs_ipc *apcs;
struct regmap *regmap;
struct resource *res;
unsigned long offset;
void __iomem *base;
unsigned long i;
int ret;
apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
if (!apcs)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
offset = (unsigned long)of_device_get_match_data(&pdev->dev);
apcs->regmap = regmap;
apcs->offset = offset;
/* Initialize channel identifiers */
for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
apcs->mbox_chans[i].con_priv = (void *)i;
apcs->mbox.dev = &pdev->dev;
apcs->mbox.ops = &qcom_apcs_ipc_ops;
apcs->mbox.chans = apcs->mbox_chans;
apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
if (ret) {
dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
return ret;
}
if (of_device_is_compatible(np, "qcom,msm8916-apcs-kpss-global")) {
apcs->clk = platform_device_register_data(&pdev->dev,
"qcom-apcs-msm8916-clk",
-1, NULL, 0);
if (IS_ERR(apcs->clk))
dev_err(&pdev->dev, "failed to register APCS clk\n");
}
platform_set_drvdata(pdev, apcs);
return 0;
}
static int qcom_apcs_ipc_remove(struct platform_device *pdev)
{
struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
struct platform_device *clk = apcs->clk;
platform_device_unregister(clk);
return 0;
}
/* .data is the offset of the ipc register within the global block */
static const struct of_device_id qcom_apcs_ipc_of_match[] = {
{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
{ .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 },
{ .compatible = "qcom,qcs404-apcs-apps-global", .data = (void *)8 },
{ .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
{}
};
MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
static struct platform_driver qcom_apcs_ipc_driver = {
.probe = qcom_apcs_ipc_probe,
.remove = qcom_apcs_ipc_remove,
.driver = {
.name = "qcom_apcs_ipc",
.of_match_table = qcom_apcs_ipc_of_match,
},
};
static int __init qcom_apcs_ipc_init(void)
{
return platform_driver_register(&qcom_apcs_ipc_driver);
}
postcore_initcall(qcom_apcs_ipc_init);
static void __exit qcom_apcs_ipc_exit(void)
{
platform_driver_unregister(&qcom_apcs_ipc_driver);
}
module_exit(qcom_apcs_ipc_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm APCS IPC driver");