1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2017 Samsung Electronics Co., Ltd.
4  * Author: Marek Szyprowski <m.szyprowski@samsung.com>
5  *
6  * Common Clock Framework support for Exynos4412 ISP module.
7 */
8 
9 #include <dt-bindings/clock/exynos4.h>
10 #include <linux/slab.h>
11 #include <linux/clk.h>
12 #include <linux/clk-provider.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 
17 #include "clk.h"
18 
19 /* Exynos4x12 specific registers, which belong to ISP power domain */
20 #define E4X12_DIV_ISP0		0x0300
21 #define E4X12_DIV_ISP1		0x0304
22 #define E4X12_GATE_ISP0		0x0800
23 #define E4X12_GATE_ISP1		0x0804
24 
25 /* NOTE: Must be equal to the last clock ID increased by one */
26 #define CLKS_NR_ISP		(CLK_ISP_DIV_MCUISP1 + 1)
27 
28 /*
29  * Support for CMU save/restore across system suspends
30  */
31 static struct samsung_clk_reg_dump *exynos4x12_save_isp;
32 
33 static const unsigned long exynos4x12_clk_isp_save[] __initconst = {
34 	E4X12_DIV_ISP0,
35 	E4X12_DIV_ISP1,
36 	E4X12_GATE_ISP0,
37 	E4X12_GATE_ISP1,
38 };
39 
40 static struct samsung_div_clock exynos4x12_isp_div_clks[] = {
41 	DIV(CLK_ISP_DIV_ISP0, "div_isp0", "aclk200", E4X12_DIV_ISP0, 0, 3),
42 	DIV(CLK_ISP_DIV_ISP1, "div_isp1", "aclk200", E4X12_DIV_ISP0, 4, 3),
43 	DIV(CLK_ISP_DIV_MCUISP0, "div_mcuisp0", "aclk400_mcuisp",
44 	    E4X12_DIV_ISP1, 4, 3),
45 	DIV(CLK_ISP_DIV_MCUISP1, "div_mcuisp1", "div_mcuisp0",
46 	    E4X12_DIV_ISP1, 8, 3),
47 	DIV(0, "div_mpwm", "div_isp1", E4X12_DIV_ISP1, 0, 3),
48 };
49 
50 static struct samsung_gate_clock exynos4x12_isp_gate_clks[] = {
51 	GATE(CLK_ISP_FIMC_ISP, "isp", "aclk200", E4X12_GATE_ISP0, 0, 0, 0),
52 	GATE(CLK_ISP_FIMC_DRC, "drc", "aclk200", E4X12_GATE_ISP0, 1, 0, 0),
53 	GATE(CLK_ISP_FIMC_FD, "fd", "aclk200", E4X12_GATE_ISP0, 2, 0, 0),
54 	GATE(CLK_ISP_FIMC_LITE0, "lite0", "aclk200", E4X12_GATE_ISP0, 3, 0, 0),
55 	GATE(CLK_ISP_FIMC_LITE1, "lite1", "aclk200", E4X12_GATE_ISP0, 4, 0, 0),
56 	GATE(CLK_ISP_MCUISP, "mcuisp", "aclk200", E4X12_GATE_ISP0, 5, 0, 0),
57 	GATE(CLK_ISP_GICISP, "gicisp", "aclk200", E4X12_GATE_ISP0, 7, 0, 0),
58 	GATE(CLK_ISP_SMMU_ISP, "smmu_isp", "aclk200", E4X12_GATE_ISP0, 8, 0, 0),
59 	GATE(CLK_ISP_SMMU_DRC, "smmu_drc", "aclk200", E4X12_GATE_ISP0, 9, 0, 0),
60 	GATE(CLK_ISP_SMMU_FD, "smmu_fd", "aclk200", E4X12_GATE_ISP0, 10, 0, 0),
61 	GATE(CLK_ISP_SMMU_LITE0, "smmu_lite0", "aclk200", E4X12_GATE_ISP0, 11,
62 	     0, 0),
63 	GATE(CLK_ISP_SMMU_LITE1, "smmu_lite1", "aclk200", E4X12_GATE_ISP0, 12,
64 	     0, 0),
65 	GATE(CLK_ISP_PPMUISPMX, "ppmuispmx", "aclk200", E4X12_GATE_ISP0, 20,
66 	     0, 0),
67 	GATE(CLK_ISP_PPMUISPX, "ppmuispx", "aclk200", E4X12_GATE_ISP0, 21,
68 	     0, 0),
69 	GATE(CLK_ISP_MCUCTL_ISP, "mcuctl_isp", "aclk200", E4X12_GATE_ISP0, 23,
70 	     0, 0),
71 	GATE(CLK_ISP_MPWM_ISP, "mpwm_isp", "aclk200", E4X12_GATE_ISP0, 24,
72 	     0, 0),
73 	GATE(CLK_ISP_I2C0_ISP, "i2c0_isp", "aclk200", E4X12_GATE_ISP0, 25,
74 	     0, 0),
75 	GATE(CLK_ISP_I2C1_ISP, "i2c1_isp", "aclk200", E4X12_GATE_ISP0, 26,
76 	     0, 0),
77 	GATE(CLK_ISP_MTCADC_ISP, "mtcadc_isp", "aclk200", E4X12_GATE_ISP0, 27,
78 	     0, 0),
79 	GATE(CLK_ISP_PWM_ISP, "pwm_isp", "aclk200", E4X12_GATE_ISP0, 28, 0, 0),
80 	GATE(CLK_ISP_WDT_ISP, "wdt_isp", "aclk200", E4X12_GATE_ISP0, 30, 0, 0),
81 	GATE(CLK_ISP_UART_ISP, "uart_isp", "aclk200", E4X12_GATE_ISP0, 31,
82 	     0, 0),
83 	GATE(CLK_ISP_ASYNCAXIM, "asyncaxim", "aclk200", E4X12_GATE_ISP1, 0,
84 	     0, 0),
85 	GATE(CLK_ISP_SMMU_ISPCX, "smmu_ispcx", "aclk200", E4X12_GATE_ISP1, 4,
86 	     0, 0),
87 	GATE(CLK_ISP_SPI0_ISP, "spi0_isp", "aclk200", E4X12_GATE_ISP1, 12,
88 	     0, 0),
89 	GATE(CLK_ISP_SPI1_ISP, "spi1_isp", "aclk200", E4X12_GATE_ISP1, 13,
90 	     0, 0),
91 };
92 
93 static int __maybe_unused exynos4x12_isp_clk_suspend(struct device *dev)
94 {
95 	struct samsung_clk_provider *ctx = dev_get_drvdata(dev);
96 
97 	samsung_clk_save(ctx->reg_base, exynos4x12_save_isp,
98 			 ARRAY_SIZE(exynos4x12_clk_isp_save));
99 	return 0;
100 }
101 
102 static int __maybe_unused exynos4x12_isp_clk_resume(struct device *dev)
103 {
104 	struct samsung_clk_provider *ctx = dev_get_drvdata(dev);
105 
106 	samsung_clk_restore(ctx->reg_base, exynos4x12_save_isp,
107 			    ARRAY_SIZE(exynos4x12_clk_isp_save));
108 	return 0;
109 }
110 
111 static int __init exynos4x12_isp_clk_probe(struct platform_device *pdev)
112 {
113 	struct samsung_clk_provider *ctx;
114 	struct device *dev = &pdev->dev;
115 	struct device_node *np = dev->of_node;
116 	void __iomem *reg_base;
117 
118 	reg_base = devm_platform_ioremap_resource(pdev, 0);
119 	if (IS_ERR(reg_base))
120 		return PTR_ERR(reg_base);
121 
122 	exynos4x12_save_isp = samsung_clk_alloc_reg_dump(exynos4x12_clk_isp_save,
123 					ARRAY_SIZE(exynos4x12_clk_isp_save));
124 	if (!exynos4x12_save_isp)
125 		return -ENOMEM;
126 
127 	ctx = samsung_clk_init(dev, reg_base, CLKS_NR_ISP);
128 
129 	platform_set_drvdata(pdev, ctx);
130 
131 	pm_runtime_set_active(dev);
132 	pm_runtime_enable(dev);
133 	pm_runtime_get_sync(dev);
134 
135 	samsung_clk_register_div(ctx, exynos4x12_isp_div_clks,
136 				 ARRAY_SIZE(exynos4x12_isp_div_clks));
137 	samsung_clk_register_gate(ctx, exynos4x12_isp_gate_clks,
138 				  ARRAY_SIZE(exynos4x12_isp_gate_clks));
139 
140 	samsung_clk_of_add_provider(np, ctx);
141 	pm_runtime_put(dev);
142 
143 	return 0;
144 }
145 
146 static const struct of_device_id exynos4x12_isp_clk_of_match[] = {
147 	{ .compatible = "samsung,exynos4412-isp-clock", },
148 	{ },
149 };
150 
151 static const struct dev_pm_ops exynos4x12_isp_pm_ops = {
152 	SET_RUNTIME_PM_OPS(exynos4x12_isp_clk_suspend,
153 			   exynos4x12_isp_clk_resume, NULL)
154 	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
155 				     pm_runtime_force_resume)
156 };
157 
158 static struct platform_driver exynos4x12_isp_clk_driver __refdata = {
159 	.driver	= {
160 		.name = "exynos4x12-isp-clk",
161 		.of_match_table = exynos4x12_isp_clk_of_match,
162 		.suppress_bind_attrs = true,
163 		.pm = &exynos4x12_isp_pm_ops,
164 	},
165 	.probe = exynos4x12_isp_clk_probe,
166 };
167 
168 static int __init exynos4x12_isp_clk_init(void)
169 {
170 	return platform_driver_register(&exynos4x12_isp_clk_driver);
171 }
172 core_initcall(exynos4x12_isp_clk_init);
173