xref: /openbmc/linux/drivers/clk/qcom/gpucc-sdm845.c (revision c4e78957) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4  */
5 
6 #include <linux/clk-provider.h>
7 #include <linux/module.h>
8 #include <linux/platform_device.h>
9 #include <linux/regmap.h>
10 
11 #include <dt-bindings/clock/qcom,gpucc-sdm845.h>
12 
13 #include "common.h"
14 #include "clk-alpha-pll.h"
15 #include "clk-branch.h"
16 #include "clk-pll.h"
17 #include "clk-rcg.h"
18 #include "clk-regmap.h"
19 #include "gdsc.h"
20 
21 #define CX_GMU_CBCR_SLEEP_MASK		0xf
22 #define CX_GMU_CBCR_SLEEP_SHIFT		4
23 #define CX_GMU_CBCR_WAKE_MASK		0xf
24 #define CX_GMU_CBCR_WAKE_SHIFT		8
25 #define CLK_DIS_WAIT_SHIFT		12
26 #define CLK_DIS_WAIT_MASK		(0xf << CLK_DIS_WAIT_SHIFT)
27 
28 enum {
29 	P_BI_TCXO,
30 	P_GPLL0_OUT_MAIN,
31 	P_GPLL0_OUT_MAIN_DIV,
32 	P_GPU_CC_PLL1_OUT_MAIN,
33 };
34 
35 static const struct alpha_pll_config gpu_cc_pll1_config = {
36 	.l = 0x1a,
37 	.alpha = 0xaab,
38 };
39 
40 static struct clk_alpha_pll gpu_cc_pll1 = {
41 	.offset = 0x100,
42 	.regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
43 	.clkr = {
44 		.hw.init = &(struct clk_init_data){
45 			.name = "gpu_cc_pll1",
46 			.parent_data = &(const struct clk_parent_data){
47 				.fw_name = "bi_tcxo", .name = "bi_tcxo",
48 			},
49 			.num_parents = 1,
50 			.ops = &clk_alpha_pll_fabia_ops,
51 		},
52 	},
53 };
54 
55 static const struct parent_map gpu_cc_parent_map_0[] = {
56 	{ P_BI_TCXO, 0 },
57 	{ P_GPU_CC_PLL1_OUT_MAIN, 3 },
58 	{ P_GPLL0_OUT_MAIN, 5 },
59 	{ P_GPLL0_OUT_MAIN_DIV, 6 },
60 };
61 
62 static const struct clk_parent_data gpu_cc_parent_data_0[] = {
63 	{ .fw_name = "bi_tcxo", .name = "bi_tcxo" },
64 	{ .hw = &gpu_cc_pll1.clkr.hw },
65 	{ .fw_name = "gcc_gpu_gpll0_clk_src", .name = "gcc_gpu_gpll0_clk_src" },
66 	{ .fw_name = "gcc_gpu_gpll0_div_clk_src", .name = "gcc_gpu_gpll0_div_clk_src" },
67 };
68 
69 static const struct freq_tbl ftbl_gpu_cc_gmu_clk_src[] = {
70 	F(19200000, P_BI_TCXO, 1, 0, 0),
71 	F(200000000, P_GPLL0_OUT_MAIN_DIV, 1.5, 0, 0),
72 	F(500000000, P_GPU_CC_PLL1_OUT_MAIN, 1, 0, 0),
73 	{ }
74 };
75 
76 static struct clk_rcg2 gpu_cc_gmu_clk_src = {
77 	.cmd_rcgr = 0x1120,
78 	.mnd_width = 0,
79 	.hid_width = 5,
80 	.parent_map = gpu_cc_parent_map_0,
81 	.freq_tbl = ftbl_gpu_cc_gmu_clk_src,
82 	.clkr.hw.init = &(struct clk_init_data){
83 		.name = "gpu_cc_gmu_clk_src",
84 		.parent_data = gpu_cc_parent_data_0,
85 		.num_parents = ARRAY_SIZE(gpu_cc_parent_data_0),
86 		.ops = &clk_rcg2_shared_ops,
87 	},
88 };
89 
90 static struct clk_branch gpu_cc_cx_gmu_clk = {
91 	.halt_reg = 0x1098,
92 	.halt_check = BRANCH_HALT,
93 	.clkr = {
94 		.enable_reg = 0x1098,
95 		.enable_mask = BIT(0),
96 		.hw.init = &(struct clk_init_data){
97 			.name = "gpu_cc_cx_gmu_clk",
98 			.parent_hws = (const struct clk_hw*[]){
99 				&gpu_cc_gmu_clk_src.clkr.hw,
100 			},
101 			.num_parents = 1,
102 			.flags = CLK_SET_RATE_PARENT,
103 			.ops = &clk_branch2_ops,
104 		},
105 	},
106 };
107 
108 static struct clk_branch gpu_cc_cxo_clk = {
109 	.halt_reg = 0x109c,
110 	.halt_check = BRANCH_HALT,
111 	.clkr = {
112 		.enable_reg = 0x109c,
113 		.enable_mask = BIT(0),
114 		.hw.init = &(struct clk_init_data){
115 			.name = "gpu_cc_cxo_clk",
116 			.ops = &clk_branch2_ops,
117 		},
118 	},
119 };
120 
121 static struct gdsc gpu_cx_gdsc = {
122 	.gdscr = 0x106c,
123 	.gds_hw_ctrl = 0x1540,
124 	.pd = {
125 		.name = "gpu_cx_gdsc",
126 	},
127 	.pwrsts = PWRSTS_OFF_ON,
128 	.flags = VOTABLE,
129 };
130 
131 static struct gdsc gpu_gx_gdsc = {
132 	.gdscr = 0x100c,
133 	.clamp_io_ctrl = 0x1508,
134 	.pd = {
135 		.name = "gpu_gx_gdsc",
136 		.power_on = gdsc_gx_do_nothing_enable,
137 	},
138 	.pwrsts = PWRSTS_OFF_ON,
139 	.flags = CLAMP_IO | AON_RESET | POLL_CFG_GDSCR,
140 };
141 
142 static struct clk_regmap *gpu_cc_sdm845_clocks[] = {
143 	[GPU_CC_CXO_CLK] = &gpu_cc_cxo_clk.clkr,
144 	[GPU_CC_CX_GMU_CLK] = &gpu_cc_cx_gmu_clk.clkr,
145 	[GPU_CC_GMU_CLK_SRC] = &gpu_cc_gmu_clk_src.clkr,
146 	[GPU_CC_PLL1] = &gpu_cc_pll1.clkr,
147 };
148 
149 static struct gdsc *gpu_cc_sdm845_gdscs[] = {
150 	[GPU_CX_GDSC] = &gpu_cx_gdsc,
151 	[GPU_GX_GDSC] = &gpu_gx_gdsc,
152 };
153 
154 static const struct regmap_config gpu_cc_sdm845_regmap_config = {
155 	.reg_bits	= 32,
156 	.reg_stride	= 4,
157 	.val_bits	= 32,
158 	.max_register	= 0x8008,
159 	.fast_io	= true,
160 };
161 
162 static const struct qcom_cc_desc gpu_cc_sdm845_desc = {
163 	.config = &gpu_cc_sdm845_regmap_config,
164 	.clks = gpu_cc_sdm845_clocks,
165 	.num_clks = ARRAY_SIZE(gpu_cc_sdm845_clocks),
166 	.gdscs = gpu_cc_sdm845_gdscs,
167 	.num_gdscs = ARRAY_SIZE(gpu_cc_sdm845_gdscs),
168 };
169 
170 static const struct of_device_id gpu_cc_sdm845_match_table[] = {
171 	{ .compatible = "qcom,sdm845-gpucc" },
172 	{ }
173 };
174 MODULE_DEVICE_TABLE(of, gpu_cc_sdm845_match_table);
175 
176 static int gpu_cc_sdm845_probe(struct platform_device *pdev)
177 {
178 	struct regmap *regmap;
179 	unsigned int value, mask;
180 
181 	regmap = qcom_cc_map(pdev, &gpu_cc_sdm845_desc);
182 	if (IS_ERR(regmap))
183 		return PTR_ERR(regmap);
184 
185 	clk_fabia_pll_configure(&gpu_cc_pll1, regmap, &gpu_cc_pll1_config);
186 
187 	/*
188 	 * Configure gpu_cc_cx_gmu_clk with recommended
189 	 * wakeup/sleep settings
190 	 */
191 	mask = CX_GMU_CBCR_WAKE_MASK << CX_GMU_CBCR_WAKE_SHIFT;
192 	mask |= CX_GMU_CBCR_SLEEP_MASK << CX_GMU_CBCR_SLEEP_SHIFT;
193 	value = 0xf << CX_GMU_CBCR_WAKE_SHIFT | 0xf << CX_GMU_CBCR_SLEEP_SHIFT;
194 	regmap_update_bits(regmap, 0x1098, mask, value);
195 
196 	/* Configure clk_dis_wait for gpu_cx_gdsc */
197 	regmap_update_bits(regmap, 0x106c, CLK_DIS_WAIT_MASK,
198 						8 << CLK_DIS_WAIT_SHIFT);
199 
200 	return qcom_cc_really_probe(pdev, &gpu_cc_sdm845_desc, regmap);
201 }
202 
203 static struct platform_driver gpu_cc_sdm845_driver = {
204 	.probe = gpu_cc_sdm845_probe,
205 	.driver = {
206 		.name = "sdm845-gpucc",
207 		.of_match_table = gpu_cc_sdm845_match_table,
208 	},
209 };
210 
211 static int __init gpu_cc_sdm845_init(void)
212 {
213 	return platform_driver_register(&gpu_cc_sdm845_driver);
214 }
215 subsys_initcall(gpu_cc_sdm845_init);
216 
217 static void __exit gpu_cc_sdm845_exit(void)
218 {
219 	platform_driver_unregister(&gpu_cc_sdm845_driver);
220 }
221 module_exit(gpu_cc_sdm845_exit);
222 
223 MODULE_DESCRIPTION("QTI GPUCC SDM845 Driver");
224 MODULE_LICENSE("GPL v2");
225