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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2020 Samsung Electronics Co., Ltd.
* Copyright 2020 Google LLC.
* Copyright 2024 Linaro Ltd.
*/
#include <linux/bitops.h>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox/exynos-message.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define EXYNOS_MBOX_MCUCTRL 0x0 /* Mailbox Control Register */
#define EXYNOS_MBOX_INTCR0 0x24 /* Interrupt Clear Register 0 */
#define EXYNOS_MBOX_INTMR0 0x28 /* Interrupt Mask Register 0 */
#define EXYNOS_MBOX_INTSR0 0x2c /* Interrupt Status Register 0 */
#define EXYNOS_MBOX_INTMSR0 0x30 /* Interrupt Mask Status Register 0 */
#define EXYNOS_MBOX_INTGR1 0x40 /* Interrupt Generation Register 1 */
#define EXYNOS_MBOX_INTMR1 0x48 /* Interrupt Mask Register 1 */
#define EXYNOS_MBOX_INTSR1 0x4c /* Interrupt Status Register 1 */
#define EXYNOS_MBOX_INTMSR1 0x50 /* Interrupt Mask Status Register 1 */
#define EXYNOS_MBOX_INTMR0_MASK GENMASK(15, 0)
#define EXYNOS_MBOX_INTGR1_MASK GENMASK(15, 0)
#define EXYNOS_MBOX_CHAN_COUNT HWEIGHT32(EXYNOS_MBOX_INTGR1_MASK)
/**
* struct exynos_mbox - driver's private data.
* @regs: mailbox registers base address.
* @mbox: pointer to the mailbox controller.
* @pclk: pointer to the mailbox peripheral clock.
*/
struct exynos_mbox {
void __iomem *regs;
struct mbox_controller *mbox;
struct clk *pclk;
};
static int exynos_mbox_send_data(struct mbox_chan *chan, void *data)
{
struct device *dev = chan->mbox->dev;
struct exynos_mbox *exynos_mbox = dev_get_drvdata(dev);
struct exynos_mbox_msg *msg = data;
if (msg->chan_id >= exynos_mbox->mbox->num_chans) {
dev_err(dev, "Invalid channel ID %d\n", msg->chan_id);
return -EINVAL;
}
if (msg->chan_type != EXYNOS_MBOX_CHAN_TYPE_DOORBELL) {
dev_err(dev, "Unsupported channel type [%d]\n", msg->chan_type);
return -EINVAL;
}
writel(BIT(msg->chan_id), exynos_mbox->regs + EXYNOS_MBOX_INTGR1);
return 0;
}
static const struct mbox_chan_ops exynos_mbox_chan_ops = {
.send_data = exynos_mbox_send_data,
};
static struct mbox_chan *exynos_mbox_of_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
int i;
if (sp->args_count != 0)
return ERR_PTR(-EINVAL);
/*
* Return the first available channel. When we don't pass the
* channel ID from device tree, each channel populated by the driver is
* just a software construct or a virtual channel. We use 'void *data'
* in send_data() to pass the channel identifiers.
*/
for (i = 0; i < mbox->num_chans; i++)
if (mbox->chans[i].cl == NULL)
return &mbox->chans[i];
return ERR_PTR(-EINVAL);
}
static const struct of_device_id exynos_mbox_match[] = {
{ .compatible = "google,gs101-mbox" },
{},
};
MODULE_DEVICE_TABLE(of, exynos_mbox_match);
static int exynos_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct exynos_mbox *exynos_mbox;
struct mbox_controller *mbox;
struct mbox_chan *chans;
int i;
exynos_mbox = devm_kzalloc(dev, sizeof(*exynos_mbox), GFP_KERNEL);
if (!exynos_mbox)
return -ENOMEM;
mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
if (!mbox)
return -ENOMEM;
chans = devm_kcalloc(dev, EXYNOS_MBOX_CHAN_COUNT, sizeof(*chans),
GFP_KERNEL);
if (!chans)
return -ENOMEM;
exynos_mbox->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(exynos_mbox->regs))
return PTR_ERR(exynos_mbox->regs);
exynos_mbox->pclk = devm_clk_get_enabled(dev, "pclk");
if (IS_ERR(exynos_mbox->pclk))
return dev_err_probe(dev, PTR_ERR(exynos_mbox->pclk),
"Failed to enable clock.\n");
mbox->num_chans = EXYNOS_MBOX_CHAN_COUNT;
mbox->chans = chans;
mbox->dev = dev;
mbox->ops = &exynos_mbox_chan_ops;
mbox->of_xlate = exynos_mbox_of_xlate;
for (i = 0; i < EXYNOS_MBOX_CHAN_COUNT; i++)
chans[i].mbox = mbox;
exynos_mbox->mbox = mbox;
platform_set_drvdata(pdev, exynos_mbox);
/* Mask out all interrupts. We support just polling channels for now. */
writel(EXYNOS_MBOX_INTMR0_MASK, exynos_mbox->regs + EXYNOS_MBOX_INTMR0);
return devm_mbox_controller_register(dev, mbox);
}
static struct platform_driver exynos_mbox_driver = {
.probe = exynos_mbox_probe,
.driver = {
.name = "exynos-acpm-mbox",
.of_match_table = exynos_mbox_match,
},
};
module_platform_driver(exynos_mbox_driver);
MODULE_AUTHOR("Tudor Ambarus <tudor.ambarus@linaro.org>");
MODULE_DESCRIPTION("Samsung Exynos mailbox driver");
MODULE_LICENSE("GPL");
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