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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple Generic RTKit helper coprocessor
* Copyright The Asahi Linux Contributors
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/soc/apple/rtkit.h>
#define APPLE_ASC_CPU_CONTROL 0x44
#define APPLE_ASC_CPU_CONTROL_RUN BIT(4)
struct apple_rtkit_helper {
struct device *dev;
struct apple_rtkit *rtk;
void __iomem *asc_base;
struct resource *sram;
void __iomem *sram_base;
};
static int apple_rtkit_helper_shmem_setup(void *cookie, struct apple_rtkit_shmem *bfr)
{
struct apple_rtkit_helper *helper = cookie;
struct resource res = {
.start = bfr->iova,
.end = bfr->iova + bfr->size - 1,
.name = "rtkit_map",
.flags = helper->sram->flags,
};
if (!bfr->iova) {
bfr->buffer = dma_alloc_coherent(helper->dev, bfr->size,
&bfr->iova, GFP_KERNEL);
if (!bfr->buffer)
return -ENOMEM;
return 0;
}
if (!helper->sram) {
dev_err(helper->dev,
"RTKit buffer request with no SRAM region: %pR", &res);
return -EFAULT;
}
if (res.end < res.start || !resource_contains(helper->sram, &res)) {
dev_err(helper->dev,
"RTKit buffer request outside SRAM region: %pR", &res);
return -EFAULT;
}
bfr->iomem = helper->sram_base + (res.start - helper->sram->start);
bfr->is_mapped = true;
return 0;
}
static void apple_rtkit_helper_shmem_destroy(void *cookie, struct apple_rtkit_shmem *bfr)
{
// no-op
}
static const struct apple_rtkit_ops apple_rtkit_helper_ops = {
.shmem_setup = apple_rtkit_helper_shmem_setup,
.shmem_destroy = apple_rtkit_helper_shmem_destroy,
};
static int apple_rtkit_helper_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct apple_rtkit_helper *helper;
int ret;
helper = devm_kzalloc(dev, sizeof(*helper), GFP_KERNEL);
if (!helper)
return -ENOMEM;
helper->dev = dev;
platform_set_drvdata(pdev, helper);
helper->asc_base = devm_platform_ioremap_resource_byname(pdev, "asc");
if (IS_ERR(helper->asc_base))
return PTR_ERR(helper->asc_base);
helper->sram = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
if (helper->sram) {
helper->sram_base = devm_ioremap_resource(dev, helper->sram);
if (IS_ERR(helper->sram_base))
return dev_err_probe(dev, PTR_ERR(helper->sram_base),
"Failed to map SRAM region");
}
helper->rtk =
devm_apple_rtkit_init(dev, helper, NULL, 0, &apple_rtkit_helper_ops);
if (IS_ERR(helper->rtk))
return dev_err_probe(dev, PTR_ERR(helper->rtk),
"Failed to intialize RTKit");
writel_relaxed(APPLE_ASC_CPU_CONTROL_RUN,
helper->asc_base + APPLE_ASC_CPU_CONTROL);
/* Works for both wake and boot */
ret = apple_rtkit_wake(helper->rtk);
if (ret != 0)
return dev_err_probe(dev, ret, "Failed to wake up coprocessor");
return 0;
}
static int apple_rtkit_helper_remove(struct platform_device *pdev)
{
struct apple_rtkit_helper *helper = platform_get_drvdata(pdev);
if (apple_rtkit_is_running(helper->rtk))
apple_rtkit_quiesce(helper->rtk);
writel_relaxed(0, helper->asc_base + APPLE_ASC_CPU_CONTROL);
return 0;
}
static const struct of_device_id apple_rtkit_helper_of_match[] = {
{ .compatible = "apple,rtk-helper-asc4" },
{},
};
MODULE_DEVICE_TABLE(of, apple_rtkit_helper_of_match);
static struct platform_driver apple_rtkit_helper_driver = {
.driver = {
.name = "rtkit-helper",
.of_match_table = apple_rtkit_helper_of_match,
},
.probe = apple_rtkit_helper_probe,
.remove = apple_rtkit_helper_remove,
};
module_platform_driver(apple_rtkit_helper_driver);
MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
MODULE_LICENSE("Dual MIT/GPL");
MODULE_DESCRIPTION("Apple RTKit helper driver");
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