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9ac33b0c PU |
1 | /* |
2 | * DRA7 ATL (Audio Tracking Logic) clock driver | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments, Inc. | |
5 | * | |
6 | * Peter Ujfalusi <peter.ujfalusi@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
172ff5a2 | 18 | #include <linux/init.h> |
1b29e601 | 19 | #include <linux/clk.h> |
9ac33b0c PU |
20 | #include <linux/clk-provider.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/of_address.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/pm_runtime.h> | |
1ae79c46 TK |
27 | #include <linux/clk/ti.h> |
28 | ||
29 | #include "clock.h" | |
9ac33b0c PU |
30 | |
31 | #define DRA7_ATL_INSTANCES 4 | |
32 | ||
33 | #define DRA7_ATL_PPMR_REG(id) (0x200 + (id * 0x80)) | |
34 | #define DRA7_ATL_BBSR_REG(id) (0x204 + (id * 0x80)) | |
35 | #define DRA7_ATL_ATLCR_REG(id) (0x208 + (id * 0x80)) | |
36 | #define DRA7_ATL_SWEN_REG(id) (0x210 + (id * 0x80)) | |
37 | #define DRA7_ATL_BWSMUX_REG(id) (0x214 + (id * 0x80)) | |
38 | #define DRA7_ATL_AWSMUX_REG(id) (0x218 + (id * 0x80)) | |
39 | #define DRA7_ATL_PCLKMUX_REG(id) (0x21c + (id * 0x80)) | |
40 | ||
41 | #define DRA7_ATL_SWEN BIT(0) | |
42 | #define DRA7_ATL_DIVIDER_MASK (0x1f) | |
43 | #define DRA7_ATL_PCLKMUX BIT(0) | |
44 | struct dra7_atl_clock_info; | |
45 | ||
46 | struct dra7_atl_desc { | |
47 | struct clk *clk; | |
48 | struct clk_hw hw; | |
49 | struct dra7_atl_clock_info *cinfo; | |
50 | int id; | |
51 | ||
52 | bool probed; /* the driver for the IP has been loaded */ | |
53 | bool valid; /* configured */ | |
54 | bool enabled; | |
55 | u32 bws; /* Baseband Word Select Mux */ | |
56 | u32 aws; /* Audio Word Select Mux */ | |
57 | u32 divider; /* Cached divider value */ | |
58 | }; | |
59 | ||
60 | struct dra7_atl_clock_info { | |
61 | struct device *dev; | |
62 | void __iomem *iobase; | |
63 | ||
64 | struct dra7_atl_desc *cdesc; | |
65 | }; | |
66 | ||
67 | #define to_atl_desc(_hw) container_of(_hw, struct dra7_atl_desc, hw) | |
68 | ||
69 | static inline void atl_write(struct dra7_atl_clock_info *cinfo, u32 reg, | |
70 | u32 val) | |
71 | { | |
72 | __raw_writel(val, cinfo->iobase + reg); | |
73 | } | |
74 | ||
75 | static inline int atl_read(struct dra7_atl_clock_info *cinfo, u32 reg) | |
76 | { | |
77 | return __raw_readl(cinfo->iobase + reg); | |
78 | } | |
79 | ||
80 | static int atl_clk_enable(struct clk_hw *hw) | |
81 | { | |
82 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
83 | ||
84 | if (!cdesc->probed) | |
85 | goto out; | |
86 | ||
87 | if (unlikely(!cdesc->valid)) | |
88 | dev_warn(cdesc->cinfo->dev, "atl%d has not been configured\n", | |
89 | cdesc->id); | |
90 | pm_runtime_get_sync(cdesc->cinfo->dev); | |
91 | ||
92 | atl_write(cdesc->cinfo, DRA7_ATL_ATLCR_REG(cdesc->id), | |
93 | cdesc->divider - 1); | |
94 | atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), DRA7_ATL_SWEN); | |
95 | ||
96 | out: | |
97 | cdesc->enabled = true; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static void atl_clk_disable(struct clk_hw *hw) | |
103 | { | |
104 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
105 | ||
106 | if (!cdesc->probed) | |
107 | goto out; | |
108 | ||
109 | atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), 0); | |
110 | pm_runtime_put_sync(cdesc->cinfo->dev); | |
111 | ||
112 | out: | |
113 | cdesc->enabled = false; | |
114 | } | |
115 | ||
116 | static int atl_clk_is_enabled(struct clk_hw *hw) | |
117 | { | |
118 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
119 | ||
120 | return cdesc->enabled; | |
121 | } | |
122 | ||
123 | static unsigned long atl_clk_recalc_rate(struct clk_hw *hw, | |
124 | unsigned long parent_rate) | |
125 | { | |
126 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
127 | ||
128 | return parent_rate / cdesc->divider; | |
129 | } | |
130 | ||
131 | static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate, | |
132 | unsigned long *parent_rate) | |
133 | { | |
134 | unsigned divider; | |
135 | ||
136 | divider = (*parent_rate + rate / 2) / rate; | |
137 | if (divider > DRA7_ATL_DIVIDER_MASK + 1) | |
138 | divider = DRA7_ATL_DIVIDER_MASK + 1; | |
139 | ||
140 | return *parent_rate / divider; | |
141 | } | |
142 | ||
143 | static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate, | |
144 | unsigned long parent_rate) | |
145 | { | |
20411dad | 146 | struct dra7_atl_desc *cdesc; |
9ac33b0c PU |
147 | u32 divider; |
148 | ||
20411dad NM |
149 | if (!hw || !rate) |
150 | return -EINVAL; | |
151 | ||
152 | cdesc = to_atl_desc(hw); | |
9ac33b0c PU |
153 | divider = ((parent_rate + rate / 2) / rate) - 1; |
154 | if (divider > DRA7_ATL_DIVIDER_MASK) | |
155 | divider = DRA7_ATL_DIVIDER_MASK; | |
156 | ||
157 | cdesc->divider = divider + 1; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
412d6b47 | 162 | static const struct clk_ops atl_clk_ops = { |
9ac33b0c PU |
163 | .enable = atl_clk_enable, |
164 | .disable = atl_clk_disable, | |
165 | .is_enabled = atl_clk_is_enabled, | |
166 | .recalc_rate = atl_clk_recalc_rate, | |
167 | .round_rate = atl_clk_round_rate, | |
168 | .set_rate = atl_clk_set_rate, | |
169 | }; | |
170 | ||
171 | static void __init of_dra7_atl_clock_setup(struct device_node *node) | |
172 | { | |
173 | struct dra7_atl_desc *clk_hw = NULL; | |
412d6b47 | 174 | struct clk_init_data init = { NULL }; |
9ac33b0c PU |
175 | const char **parent_names = NULL; |
176 | struct clk *clk; | |
177 | ||
178 | clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); | |
179 | if (!clk_hw) { | |
180 | pr_err("%s: could not allocate dra7_atl_desc\n", __func__); | |
181 | return; | |
182 | } | |
183 | ||
184 | clk_hw->hw.init = &init; | |
185 | clk_hw->divider = 1; | |
186 | init.name = node->name; | |
187 | init.ops = &atl_clk_ops; | |
188 | init.flags = CLK_IGNORE_UNUSED; | |
189 | init.num_parents = of_clk_get_parent_count(node); | |
190 | ||
191 | if (init.num_parents != 1) { | |
e665f029 RH |
192 | pr_err("%s: atl clock %pOFn must have 1 parent\n", __func__, |
193 | node); | |
9ac33b0c PU |
194 | goto cleanup; |
195 | } | |
196 | ||
197 | parent_names = kzalloc(sizeof(char *), GFP_KERNEL); | |
198 | ||
199 | if (!parent_names) | |
200 | goto cleanup; | |
201 | ||
202 | parent_names[0] = of_clk_get_parent_name(node, 0); | |
203 | ||
204 | init.parent_names = parent_names; | |
205 | ||
1ae79c46 | 206 | clk = ti_clk_register(NULL, &clk_hw->hw, node->name); |
9ac33b0c PU |
207 | |
208 | if (!IS_ERR(clk)) { | |
209 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
73b5d5f7 | 210 | kfree(parent_names); |
9ac33b0c PU |
211 | return; |
212 | } | |
213 | cleanup: | |
214 | kfree(parent_names); | |
215 | kfree(clk_hw); | |
216 | } | |
217 | CLK_OF_DECLARE(dra7_atl_clock, "ti,dra7-atl-clock", of_dra7_atl_clock_setup); | |
218 | ||
219 | static int of_dra7_atl_clk_probe(struct platform_device *pdev) | |
220 | { | |
221 | struct device_node *node = pdev->dev.of_node; | |
222 | struct dra7_atl_clock_info *cinfo; | |
223 | int i; | |
224 | int ret = 0; | |
225 | ||
226 | if (!node) | |
227 | return -ENODEV; | |
228 | ||
229 | cinfo = devm_kzalloc(&pdev->dev, sizeof(*cinfo), GFP_KERNEL); | |
230 | if (!cinfo) | |
231 | return -ENOMEM; | |
232 | ||
233 | cinfo->iobase = of_iomap(node, 0); | |
234 | cinfo->dev = &pdev->dev; | |
235 | pm_runtime_enable(cinfo->dev); | |
236 | ||
237 | pm_runtime_get_sync(cinfo->dev); | |
238 | atl_write(cinfo, DRA7_ATL_PCLKMUX_REG(0), DRA7_ATL_PCLKMUX); | |
239 | ||
240 | for (i = 0; i < DRA7_ATL_INSTANCES; i++) { | |
241 | struct device_node *cfg_node; | |
242 | char prop[5]; | |
243 | struct dra7_atl_desc *cdesc; | |
244 | struct of_phandle_args clkspec; | |
245 | struct clk *clk; | |
246 | int rc; | |
247 | ||
248 | rc = of_parse_phandle_with_args(node, "ti,provided-clocks", | |
249 | NULL, i, &clkspec); | |
250 | ||
251 | if (rc) { | |
252 | pr_err("%s: failed to lookup atl clock %d\n", __func__, | |
253 | i); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | clk = of_clk_get_from_provider(&clkspec); | |
e0cdcda5 KK |
258 | if (IS_ERR(clk)) { |
259 | pr_err("%s: failed to get atl clock %d from provider\n", | |
260 | __func__, i); | |
261 | return PTR_ERR(clk); | |
262 | } | |
9ac33b0c PU |
263 | |
264 | cdesc = to_atl_desc(__clk_get_hw(clk)); | |
265 | cdesc->cinfo = cinfo; | |
266 | cdesc->id = i; | |
267 | ||
268 | /* Get configuration for the ATL instances */ | |
269 | snprintf(prop, sizeof(prop), "atl%u", i); | |
33ec6dbc | 270 | cfg_node = of_get_child_by_name(node, prop); |
9ac33b0c PU |
271 | if (cfg_node) { |
272 | ret = of_property_read_u32(cfg_node, "bws", | |
273 | &cdesc->bws); | |
274 | ret |= of_property_read_u32(cfg_node, "aws", | |
275 | &cdesc->aws); | |
276 | if (!ret) { | |
277 | cdesc->valid = true; | |
278 | atl_write(cinfo, DRA7_ATL_BWSMUX_REG(i), | |
279 | cdesc->bws); | |
280 | atl_write(cinfo, DRA7_ATL_AWSMUX_REG(i), | |
281 | cdesc->aws); | |
282 | } | |
660e1551 | 283 | of_node_put(cfg_node); |
9ac33b0c PU |
284 | } |
285 | ||
286 | cdesc->probed = true; | |
287 | /* | |
288 | * Enable the clock if it has been asked prior to loading the | |
289 | * hw driver | |
290 | */ | |
291 | if (cdesc->enabled) | |
292 | atl_clk_enable(__clk_get_hw(clk)); | |
293 | } | |
294 | pm_runtime_put_sync(cinfo->dev); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
f375573c | 299 | static const struct of_device_id of_dra7_atl_clk_match_tbl[] = { |
9ac33b0c PU |
300 | { .compatible = "ti,dra7-atl", }, |
301 | {}, | |
302 | }; | |
9ac33b0c PU |
303 | |
304 | static struct platform_driver dra7_atl_clk_driver = { | |
305 | .driver = { | |
306 | .name = "dra7-atl", | |
172ff5a2 | 307 | .suppress_bind_attrs = true, |
9ac33b0c PU |
308 | .of_match_table = of_dra7_atl_clk_match_tbl, |
309 | }, | |
310 | .probe = of_dra7_atl_clk_probe, | |
9ac33b0c | 311 | }; |
172ff5a2 | 312 | builtin_platform_driver(dra7_atl_clk_driver); |