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Release 4.14 drivers/mailbox/qcom-apcs-ipc-mailbox.c

Directory: drivers/mailbox
/*
 * Copyright (c) 2017, Linaro Ltd
 *
 * 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/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/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];

	
void __iomem *reg;
	
unsigned long offset;
};


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; writel(BIT(idx), apcs->reg); return 0; }

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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 qcom_apcs_ipc *apcs; 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); offset = (unsigned long)of_device_get_match_data(&pdev->dev); apcs->reg = base + 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 = mbox_controller_register(&apcs->mbox); if (ret) { dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); return ret; } platform_set_drvdata(pdev, apcs); return 0; }

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static int qcom_apcs_ipc_remove(struct platform_device *pdev) { struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); mbox_controller_unregister(&apcs->mbox); return 0; }

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/* .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 }, {} }; 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); }

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postcore_initcall(qcom_apcs_ipc_init);
static void __exit qcom_apcs_ipc_exit(void) { platform_driver_unregister(&qcom_apcs_ipc_driver); }

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module_exit(qcom_apcs_ipc_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Qualcomm APCS IPC driver");

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Directory: drivers/mailbox
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