1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/kernel.h>
  7#include <linux/err.h>
  8#include <linux/platform_device.h>
  9#include <linux/clk-provider.h>
 10#include <linux/regmap.h>
 11#include <linux/module.h>
 12#include <linux/clk.h>
 13#include <linux/soc/qcom/smem.h>
 14
 15#include <dt-bindings/clock/qcom,apss-ipq.h>
 16#include <dt-bindings/arm/qcom,ids.h>
 17
 18#include "common.h"
 19#include "clk-regmap.h"
 20#include "clk-branch.h"
 21#include "clk-alpha-pll.h"
 22#include "clk-rcg.h"
 23
 24enum {
 25	P_XO,
 26	P_GPLL0,
 27	P_APSS_PLL_EARLY,
 28};
 29
 30static const struct clk_parent_data parents_apcs_alias0_clk_src[] = {
 31	{ .fw_name = "xo" },
 32	{ .fw_name = "gpll0" },
 33	{ .fw_name = "pll" },
 34};
 35
 36static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
 37	{ P_XO, 0 },
 38	{ P_GPLL0, 4 },
 39	{ P_APSS_PLL_EARLY, 5 },
 40};
 41
 42static struct clk_rcg2 apcs_alias0_clk_src = {
 43	.cmd_rcgr = 0x0050,
 44	.hid_width = 5,
 45	.parent_map = parents_apcs_alias0_clk_src_map,
 46	.clkr.hw.init = &(struct clk_init_data){
 47		.name = "apcs_alias0_clk_src",
 48		.parent_data = parents_apcs_alias0_clk_src,
 49		.num_parents = ARRAY_SIZE(parents_apcs_alias0_clk_src),
 50		.ops = &clk_rcg2_mux_closest_ops,
 51		.flags = CLK_SET_RATE_PARENT,
 52	},
 53};
 54
 55static struct clk_branch apcs_alias0_core_clk = {
 56	.halt_reg = 0x0058,
 57	.clkr = {
 58		.enable_reg = 0x0058,
 59		.enable_mask = BIT(0),
 60		.hw.init = &(struct clk_init_data){
 61			.name = "apcs_alias0_core_clk",
 62			.parent_hws = (const struct clk_hw *[]){
 63				&apcs_alias0_clk_src.clkr.hw },
 64			.num_parents = 1,
 65			.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
 66			.ops = &clk_branch2_ops,
 67		},
 68	},
 69};
 70
 71static const struct regmap_config apss_ipq6018_regmap_config = {
 72	.reg_bits       = 32,
 73	.reg_stride     = 4,
 74	.val_bits       = 32,
 75	.max_register   = 0x1000,
 76	.fast_io        = true,
 77};
 78
 79static struct clk_regmap *apss_ipq6018_clks[] = {
 80	[APCS_ALIAS0_CLK_SRC] = &apcs_alias0_clk_src.clkr,
 81	[APCS_ALIAS0_CORE_CLK] = &apcs_alias0_core_clk.clkr,
 82};
 83
 84static const struct qcom_cc_desc apss_ipq6018_desc = {
 85	.config = &apss_ipq6018_regmap_config,
 86	.clks = apss_ipq6018_clks,
 87	.num_clks = ARRAY_SIZE(apss_ipq6018_clks),
 88};
 89
 90static int cpu_clk_notifier_fn(struct notifier_block *nb, unsigned long action,
 91				void *data)
 92{
 93	struct clk_hw *hw;
 94	u8 index;
 95	int err;
 96
 97	if (action == PRE_RATE_CHANGE)
 98		index = P_GPLL0;
 99	else if (action == POST_RATE_CHANGE || action == ABORT_RATE_CHANGE)
100		index = P_APSS_PLL_EARLY;
101	else
102		return NOTIFY_OK;
103
104	hw = &apcs_alias0_clk_src.clkr.hw;
105	err = clk_rcg2_mux_closest_ops.set_parent(hw, index);
106
107	return notifier_from_errno(err);
108}
109
110static int apss_ipq6018_probe(struct platform_device *pdev)
111{
112	struct clk_hw *hw = &apcs_alias0_clk_src.clkr.hw;
113	struct notifier_block *cpu_clk_notifier;
114	struct regmap *regmap;
115	u32 soc_id;
116	int ret;
117
118	ret = qcom_smem_get_soc_id(&soc_id);
119	if (ret)
120		return ret;
121
122	regmap = dev_get_regmap(pdev->dev.parent, NULL);
123	if (!regmap)
124		return -ENODEV;
125
126	ret = qcom_cc_really_probe(pdev, &apss_ipq6018_desc, regmap);
127	if (ret)
128		return ret;
129
130	switch (soc_id) {
131	/* Only below variants of IPQ53xx support scaling */
132	case QCOM_ID_IPQ5332:
133	case QCOM_ID_IPQ5322:
134	case QCOM_ID_IPQ5300:
135		cpu_clk_notifier = devm_kzalloc(&pdev->dev,
136						sizeof(*cpu_clk_notifier),
137						GFP_KERNEL);
138		if (!cpu_clk_notifier)
139			return -ENOMEM;
140
141		cpu_clk_notifier->notifier_call = cpu_clk_notifier_fn;
142
143		ret = devm_clk_notifier_register(&pdev->dev, hw->clk, cpu_clk_notifier);
144		if (ret)
145			return ret;
146		break;
147	default:
148		break;
149	}
150
151	return 0;
152}
153
154static struct platform_driver apss_ipq6018_driver = {
155	.probe = apss_ipq6018_probe,
156	.driver = {
157		.name   = "qcom,apss-ipq6018-clk",
158	},
159};
160
161module_platform_driver(apss_ipq6018_driver);
162
163MODULE_DESCRIPTION("QCOM APSS IPQ 6018 CLK Driver");
164MODULE_LICENSE("GPL v2");