1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Qualcomm SDX55 APCS clock controller driver
4 *
5 * Copyright (c) 2020, Linaro Limited
6 * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
7 */
8
9#include <linux/clk.h>
10#include <linux/clk-provider.h>
11#include <linux/cpu.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/pm_domain.h>
16#include <linux/regmap.h>
17#include <linux/slab.h>
18
19#include "clk-regmap.h"
20#include "clk-regmap-mux-div.h"
21
22static const u32 apcs_mux_clk_parent_map[] = { 0, 1, 5 };
23
24static const struct clk_parent_data pdata[] = {
25	{ .fw_name = "ref" },
26	{ .fw_name = "aux" },
27	{ .fw_name = "pll" },
28};
29
30/*
31 * We use the notifier function for switching to a temporary safe configuration
32 * (mux and divider), while the A7 PLL is reconfigured.
33 */
34static int a7cc_notifier_cb(struct notifier_block *nb, unsigned long event,
35			    void *data)
36{
37	int ret = 0;
38	struct clk_regmap_mux_div *md = container_of(nb,
39						     struct clk_regmap_mux_div,
40						     clk_nb);
41	if (event == PRE_RATE_CHANGE)
42		/* set the mux and divider to safe frequency (400mhz) */
43		ret = mux_div_set_src_div(md, 1, 2);
44
45	return notifier_from_errno(ret);
46}
47
48static int qcom_apcs_sdx55_clk_probe(struct platform_device *pdev)
49{
50	struct device *dev = &pdev->dev;
51	struct device *parent = dev->parent;
52	struct device *cpu_dev;
53	struct clk_regmap_mux_div *a7cc;
54	struct regmap *regmap;
55	struct clk_init_data init = { };
56	int ret;
57
58	regmap = dev_get_regmap(parent, NULL);
59	if (!regmap) {
60		dev_err(dev, "Failed to get parent regmap\n");
61		return -ENODEV;
62	}
63
64	a7cc = devm_kzalloc(dev, sizeof(*a7cc), GFP_KERNEL);
65	if (!a7cc)
66		return -ENOMEM;
67
68	init.name = "a7mux";
69	init.parent_data = pdata;
70	init.num_parents = ARRAY_SIZE(pdata);
71	init.ops = &clk_regmap_mux_div_ops;
72
73	a7cc->clkr.hw.init = &init;
74	a7cc->clkr.regmap = regmap;
75	a7cc->reg_offset = 0x8;
76	a7cc->hid_width = 5;
77	a7cc->hid_shift = 0;
78	a7cc->src_width = 3;
79	a7cc->src_shift = 8;
80	a7cc->parent_map = apcs_mux_clk_parent_map;
81
82	a7cc->pclk = devm_clk_get(parent, "pll");
83	if (IS_ERR(a7cc->pclk))
84		return dev_err_probe(dev, PTR_ERR(a7cc->pclk),
85				     "Failed to get PLL clk\n");
86
87	a7cc->clk_nb.notifier_call = a7cc_notifier_cb;
88	ret = clk_notifier_register(a7cc->pclk, &a7cc->clk_nb);
89	if (ret)
90		return dev_err_probe(dev, ret,
91				     "Failed to register clock notifier\n");
92
93	ret = devm_clk_register_regmap(dev, &a7cc->clkr);
94	if (ret) {
95		dev_err_probe(dev, ret, "Failed to register regmap clock\n");
96		goto err;
97	}
98
99	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
100					  &a7cc->clkr.hw);
101	if (ret) {
102		dev_err_probe(dev, ret, "Failed to add clock provider\n");
103		goto err;
104	}
105
106	platform_set_drvdata(pdev, a7cc);
107
108	/*
109	 * Attach the power domain to cpudev. Since there is no dedicated driver
110	 * for CPUs and the SDX55 platform lacks hardware specific CPUFreq
111	 * driver, there seems to be no better place to do this. So do it here!
112	 */
113	cpu_dev = get_cpu_device(0);
114	dev_pm_domain_attach(cpu_dev, true);
115
116	return 0;
117
118err:
119	clk_notifier_unregister(a7cc->pclk, &a7cc->clk_nb);
120	return ret;
121}
122
123static void qcom_apcs_sdx55_clk_remove(struct platform_device *pdev)
124{
125	struct device *cpu_dev = get_cpu_device(0);
126	struct clk_regmap_mux_div *a7cc = platform_get_drvdata(pdev);
127
128	clk_notifier_unregister(a7cc->pclk, &a7cc->clk_nb);
129	dev_pm_domain_detach(cpu_dev, true);
130}
131
132static struct platform_driver qcom_apcs_sdx55_clk_driver = {
133	.probe = qcom_apcs_sdx55_clk_probe,
134	.remove_new = qcom_apcs_sdx55_clk_remove,
135	.driver = {
136		.name = "qcom-sdx55-acps-clk",
137	},
138};
139module_platform_driver(qcom_apcs_sdx55_clk_driver);
140
141MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
142MODULE_LICENSE("GPL v2");
143MODULE_DESCRIPTION("Qualcomm SDX55 APCS clock driver");
144