forked from luck/tmp_suning_uos_patched
3ddc3564d3
The ACC and GCC regions present in KPSSv1 contain registers to control clocks and power to each Krait CPU and L2. For CPUfreq purposes probe these devices and expose a mux clock that chooses between PXO and PLL8. Cc: <devicetree@vger.kernel.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Sricharan R <sricharan@codeaurora.org> Tested-by: Craig Tatlor <ctatlor97@gmail.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2018, The Linux Foundation. All rights reserved.
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/clk-provider.h>
|
|
|
|
static const char *aux_parents[] = {
|
|
"pll8_vote",
|
|
"pxo",
|
|
};
|
|
|
|
static unsigned int aux_parent_map[] = {
|
|
3,
|
|
0,
|
|
};
|
|
|
|
static const struct of_device_id kpss_xcc_match_table[] = {
|
|
{ .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
|
|
{ .compatible = "qcom,kpss-gcc" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
|
|
|
|
static int kpss_xcc_driver_probe(struct platform_device *pdev)
|
|
{
|
|
const struct of_device_id *id;
|
|
struct clk *clk;
|
|
struct resource *res;
|
|
void __iomem *base;
|
|
const char *name;
|
|
|
|
id = of_match_device(kpss_xcc_match_table, &pdev->dev);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
if (id->data) {
|
|
if (of_property_read_string_index(pdev->dev.of_node,
|
|
"clock-output-names",
|
|
0, &name))
|
|
return -ENODEV;
|
|
base += 0x14;
|
|
} else {
|
|
name = "acpu_l2_aux";
|
|
base += 0x28;
|
|
}
|
|
|
|
clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
|
|
ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
|
|
0, aux_parent_map, NULL);
|
|
|
|
platform_set_drvdata(pdev, clk);
|
|
|
|
return PTR_ERR_OR_ZERO(clk);
|
|
}
|
|
|
|
static int kpss_xcc_driver_remove(struct platform_device *pdev)
|
|
{
|
|
clk_unregister_mux(platform_get_drvdata(pdev));
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver kpss_xcc_driver = {
|
|
.probe = kpss_xcc_driver_probe,
|
|
.remove = kpss_xcc_driver_remove,
|
|
.driver = {
|
|
.name = "kpss-xcc",
|
|
.of_match_table = kpss_xcc_match_table,
|
|
},
|
|
};
|
|
module_platform_driver(kpss_xcc_driver);
|
|
|
|
MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:kpss-xcc");
|