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54104ee0 KK |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Microchip LAN966x SoC Clock driver. | |
4 | * | |
5 | * Copyright (C) 2021 Microchip Technology, Inc. and its subsidiaries | |
6 | * | |
7 | * Author: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com> | |
8 | */ | |
9 | ||
10 | #include <linux/bitfield.h> | |
11 | #include <linux/clk-provider.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/slab.h> | |
18 | ||
19 | #include <dt-bindings/clock/microchip,lan966x.h> | |
20 | ||
21 | #define GCK_ENA BIT(0) | |
22 | #define GCK_SRC_SEL GENMASK(9, 8) | |
23 | #define GCK_PRESCALER GENMASK(23, 16) | |
24 | ||
25 | #define DIV_MAX 255 | |
26 | ||
27 | static const char *clk_names[N_CLOCKS] = { | |
28 | "qspi0", "qspi1", "qspi2", "sdmmc0", | |
29 | "pi", "mcan0", "mcan1", "flexcom0", | |
30 | "flexcom1", "flexcom2", "flexcom3", | |
31 | "flexcom4", "timer1", "usb_refclk", | |
32 | }; | |
33 | ||
34 | struct lan966x_gck { | |
35 | struct clk_hw hw; | |
36 | void __iomem *reg; | |
37 | }; | |
38 | #define to_lan966x_gck(hw) container_of(hw, struct lan966x_gck, hw) | |
39 | ||
40 | static const struct clk_parent_data lan966x_gck_pdata[] = { | |
41 | { .fw_name = "cpu", }, | |
42 | { .fw_name = "ddr", }, | |
43 | { .fw_name = "sys", }, | |
44 | }; | |
45 | ||
46 | static struct clk_init_data init = { | |
47 | .parent_data = lan966x_gck_pdata, | |
48 | .num_parents = ARRAY_SIZE(lan966x_gck_pdata), | |
49 | }; | |
50 | ||
5ad5915d HV |
51 | struct clk_gate_soc_desc { |
52 | const char *name; | |
53 | int bit_idx; | |
54 | }; | |
55 | ||
56 | static const struct clk_gate_soc_desc clk_gate_desc[] = { | |
57 | { "uhphs", 11 }, | |
58 | { "udphs", 10 }, | |
59 | { "mcramc", 9 }, | |
60 | { "hmatrix", 8 }, | |
61 | { } | |
62 | }; | |
63 | ||
64 | static DEFINE_SPINLOCK(clk_gate_lock); | |
54104ee0 KK |
65 | static void __iomem *base; |
66 | ||
67 | static int lan966x_gck_enable(struct clk_hw *hw) | |
68 | { | |
69 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
70 | u32 val = readl(gck->reg); | |
71 | ||
72 | val |= GCK_ENA; | |
73 | writel(val, gck->reg); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static void lan966x_gck_disable(struct clk_hw *hw) | |
79 | { | |
80 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
81 | u32 val = readl(gck->reg); | |
82 | ||
83 | val &= ~GCK_ENA; | |
84 | writel(val, gck->reg); | |
85 | } | |
86 | ||
87 | static int lan966x_gck_set_rate(struct clk_hw *hw, | |
88 | unsigned long rate, | |
89 | unsigned long parent_rate) | |
90 | { | |
91 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
92 | u32 div, val = readl(gck->reg); | |
93 | ||
94 | if (rate == 0 || parent_rate == 0) | |
95 | return -EINVAL; | |
96 | ||
97 | /* Set Prescalar */ | |
98 | div = parent_rate / rate; | |
99 | val &= ~GCK_PRESCALER; | |
100 | val |= FIELD_PREP(GCK_PRESCALER, (div - 1)); | |
101 | writel(val, gck->reg); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
54104ee0 KK |
106 | static unsigned long lan966x_gck_recalc_rate(struct clk_hw *hw, |
107 | unsigned long parent_rate) | |
108 | { | |
109 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
110 | u32 div, val = readl(gck->reg); | |
111 | ||
112 | div = FIELD_GET(GCK_PRESCALER, val); | |
113 | ||
114 | return parent_rate / (div + 1); | |
115 | } | |
116 | ||
117 | static int lan966x_gck_determine_rate(struct clk_hw *hw, | |
118 | struct clk_rate_request *req) | |
119 | { | |
120 | struct clk_hw *parent; | |
121 | int i; | |
122 | ||
123 | for (i = 0; i < clk_hw_get_num_parents(hw); ++i) { | |
124 | parent = clk_hw_get_parent_by_index(hw, i); | |
125 | if (!parent) | |
126 | continue; | |
127 | ||
128 | /* Allowed prescaler divider range is 0-255 */ | |
129 | if (clk_hw_get_rate(parent) / req->rate <= DIV_MAX) { | |
130 | req->best_parent_hw = parent; | |
131 | req->best_parent_rate = clk_hw_get_rate(parent); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | } | |
136 | ||
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | static u8 lan966x_gck_get_parent(struct clk_hw *hw) | |
141 | { | |
142 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
143 | u32 val = readl(gck->reg); | |
144 | ||
145 | return FIELD_GET(GCK_SRC_SEL, val); | |
146 | } | |
147 | ||
148 | static int lan966x_gck_set_parent(struct clk_hw *hw, u8 index) | |
149 | { | |
150 | struct lan966x_gck *gck = to_lan966x_gck(hw); | |
151 | u32 val = readl(gck->reg); | |
152 | ||
153 | val &= ~GCK_SRC_SEL; | |
154 | val |= FIELD_PREP(GCK_SRC_SEL, index); | |
155 | writel(val, gck->reg); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static const struct clk_ops lan966x_gck_ops = { | |
161 | .enable = lan966x_gck_enable, | |
162 | .disable = lan966x_gck_disable, | |
163 | .set_rate = lan966x_gck_set_rate, | |
54104ee0 KK |
164 | .recalc_rate = lan966x_gck_recalc_rate, |
165 | .determine_rate = lan966x_gck_determine_rate, | |
166 | .set_parent = lan966x_gck_set_parent, | |
167 | .get_parent = lan966x_gck_get_parent, | |
168 | }; | |
169 | ||
170 | static struct clk_hw *lan966x_gck_clk_register(struct device *dev, int i) | |
171 | { | |
172 | struct lan966x_gck *priv; | |
173 | int ret; | |
174 | ||
175 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
176 | if (!priv) | |
177 | return ERR_PTR(-ENOMEM); | |
178 | ||
179 | priv->reg = base + (i * 4); | |
180 | priv->hw.init = &init; | |
181 | ret = devm_clk_hw_register(dev, &priv->hw); | |
182 | if (ret) | |
183 | return ERR_PTR(ret); | |
184 | ||
185 | return &priv->hw; | |
186 | }; | |
187 | ||
5ad5915d HV |
188 | static int lan966x_gate_clk_register(struct device *dev, |
189 | struct clk_hw_onecell_data *hw_data, | |
190 | void __iomem *gate_base) | |
191 | { | |
192 | int i; | |
193 | ||
194 | for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i) { | |
195 | int idx = i - GCK_GATE_UHPHS; | |
196 | ||
197 | hw_data->hws[i] = | |
198 | devm_clk_hw_register_gate(dev, clk_gate_desc[idx].name, | |
25c2a075 | 199 | "lan966x", 0, gate_base, |
5ad5915d HV |
200 | clk_gate_desc[idx].bit_idx, |
201 | 0, &clk_gate_lock); | |
202 | ||
203 | if (IS_ERR(hw_data->hws[i])) | |
204 | return dev_err_probe(dev, PTR_ERR(hw_data->hws[i]), | |
205 | "failed to register %s clock\n", | |
206 | clk_gate_desc[idx].name); | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
54104ee0 KK |
212 | static int lan966x_clk_probe(struct platform_device *pdev) |
213 | { | |
214 | struct clk_hw_onecell_data *hw_data; | |
215 | struct device *dev = &pdev->dev; | |
5ad5915d HV |
216 | void __iomem *gate_base; |
217 | struct resource *res; | |
218 | int i, ret; | |
54104ee0 KK |
219 | |
220 | hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, N_CLOCKS), | |
221 | GFP_KERNEL); | |
222 | if (!hw_data) | |
223 | return -ENOMEM; | |
224 | ||
225 | base = devm_platform_ioremap_resource(pdev, 0); | |
226 | if (IS_ERR(base)) | |
227 | return PTR_ERR(base); | |
228 | ||
229 | init.ops = &lan966x_gck_ops; | |
230 | ||
5ad5915d | 231 | hw_data->num = GCK_GATE_UHPHS; |
54104ee0 | 232 | |
5ad5915d | 233 | for (i = 0; i < GCK_GATE_UHPHS; i++) { |
54104ee0 KK |
234 | init.name = clk_names[i]; |
235 | hw_data->hws[i] = lan966x_gck_clk_register(dev, i); | |
236 | if (IS_ERR(hw_data->hws[i])) { | |
237 | dev_err(dev, "failed to register %s clock\n", | |
238 | init.name); | |
239 | return PTR_ERR(hw_data->hws[i]); | |
240 | } | |
241 | } | |
242 | ||
5ad5915d HV |
243 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
244 | if (res) { | |
245 | gate_base = devm_ioremap_resource(&pdev->dev, res); | |
246 | if (IS_ERR(gate_base)) | |
247 | return PTR_ERR(gate_base); | |
248 | ||
249 | hw_data->num = N_CLOCKS; | |
250 | ||
251 | ret = lan966x_gate_clk_register(dev, hw_data, gate_base); | |
252 | if (ret) | |
253 | return ret; | |
254 | } | |
255 | ||
54104ee0 KK |
256 | return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data); |
257 | } | |
258 | ||
259 | static const struct of_device_id lan966x_clk_dt_ids[] = { | |
260 | { .compatible = "microchip,lan966x-gck", }, | |
261 | { } | |
262 | }; | |
263 | MODULE_DEVICE_TABLE(of, lan966x_clk_dt_ids); | |
264 | ||
265 | static struct platform_driver lan966x_clk_driver = { | |
266 | .probe = lan966x_clk_probe, | |
267 | .driver = { | |
268 | .name = "lan966x-clk", | |
269 | .of_match_table = lan966x_clk_dt_ids, | |
270 | }, | |
271 | }; | |
8a977bbb | 272 | module_platform_driver(lan966x_clk_driver); |
54104ee0 KK |
273 | |
274 | MODULE_AUTHOR("Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>"); | |
275 | MODULE_DESCRIPTION("LAN966X clock driver"); | |
276 | MODULE_LICENSE("GPL v2"); |