]>
Commit | Line | Data |
---|---|---|
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 | ||
18 | #include <linux/module.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> | |
27 | ||
28 | #define DRA7_ATL_INSTANCES 4 | |
29 | ||
30 | #define DRA7_ATL_PPMR_REG(id) (0x200 + (id * 0x80)) | |
31 | #define DRA7_ATL_BBSR_REG(id) (0x204 + (id * 0x80)) | |
32 | #define DRA7_ATL_ATLCR_REG(id) (0x208 + (id * 0x80)) | |
33 | #define DRA7_ATL_SWEN_REG(id) (0x210 + (id * 0x80)) | |
34 | #define DRA7_ATL_BWSMUX_REG(id) (0x214 + (id * 0x80)) | |
35 | #define DRA7_ATL_AWSMUX_REG(id) (0x218 + (id * 0x80)) | |
36 | #define DRA7_ATL_PCLKMUX_REG(id) (0x21c + (id * 0x80)) | |
37 | ||
38 | #define DRA7_ATL_SWEN BIT(0) | |
39 | #define DRA7_ATL_DIVIDER_MASK (0x1f) | |
40 | #define DRA7_ATL_PCLKMUX BIT(0) | |
41 | struct dra7_atl_clock_info; | |
42 | ||
43 | struct dra7_atl_desc { | |
44 | struct clk *clk; | |
45 | struct clk_hw hw; | |
46 | struct dra7_atl_clock_info *cinfo; | |
47 | int id; | |
48 | ||
49 | bool probed; /* the driver for the IP has been loaded */ | |
50 | bool valid; /* configured */ | |
51 | bool enabled; | |
52 | u32 bws; /* Baseband Word Select Mux */ | |
53 | u32 aws; /* Audio Word Select Mux */ | |
54 | u32 divider; /* Cached divider value */ | |
55 | }; | |
56 | ||
57 | struct dra7_atl_clock_info { | |
58 | struct device *dev; | |
59 | void __iomem *iobase; | |
60 | ||
61 | struct dra7_atl_desc *cdesc; | |
62 | }; | |
63 | ||
64 | #define to_atl_desc(_hw) container_of(_hw, struct dra7_atl_desc, hw) | |
65 | ||
66 | static inline void atl_write(struct dra7_atl_clock_info *cinfo, u32 reg, | |
67 | u32 val) | |
68 | { | |
69 | __raw_writel(val, cinfo->iobase + reg); | |
70 | } | |
71 | ||
72 | static inline int atl_read(struct dra7_atl_clock_info *cinfo, u32 reg) | |
73 | { | |
74 | return __raw_readl(cinfo->iobase + reg); | |
75 | } | |
76 | ||
77 | static int atl_clk_enable(struct clk_hw *hw) | |
78 | { | |
79 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
80 | ||
81 | if (!cdesc->probed) | |
82 | goto out; | |
83 | ||
84 | if (unlikely(!cdesc->valid)) | |
85 | dev_warn(cdesc->cinfo->dev, "atl%d has not been configured\n", | |
86 | cdesc->id); | |
87 | pm_runtime_get_sync(cdesc->cinfo->dev); | |
88 | ||
89 | atl_write(cdesc->cinfo, DRA7_ATL_ATLCR_REG(cdesc->id), | |
90 | cdesc->divider - 1); | |
91 | atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), DRA7_ATL_SWEN); | |
92 | ||
93 | out: | |
94 | cdesc->enabled = true; | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void atl_clk_disable(struct clk_hw *hw) | |
100 | { | |
101 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
102 | ||
103 | if (!cdesc->probed) | |
104 | goto out; | |
105 | ||
106 | atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), 0); | |
107 | pm_runtime_put_sync(cdesc->cinfo->dev); | |
108 | ||
109 | out: | |
110 | cdesc->enabled = false; | |
111 | } | |
112 | ||
113 | static int atl_clk_is_enabled(struct clk_hw *hw) | |
114 | { | |
115 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
116 | ||
117 | return cdesc->enabled; | |
118 | } | |
119 | ||
120 | static unsigned long atl_clk_recalc_rate(struct clk_hw *hw, | |
121 | unsigned long parent_rate) | |
122 | { | |
123 | struct dra7_atl_desc *cdesc = to_atl_desc(hw); | |
124 | ||
125 | return parent_rate / cdesc->divider; | |
126 | } | |
127 | ||
128 | static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate, | |
129 | unsigned long *parent_rate) | |
130 | { | |
131 | unsigned divider; | |
132 | ||
133 | divider = (*parent_rate + rate / 2) / rate; | |
134 | if (divider > DRA7_ATL_DIVIDER_MASK + 1) | |
135 | divider = DRA7_ATL_DIVIDER_MASK + 1; | |
136 | ||
137 | return *parent_rate / divider; | |
138 | } | |
139 | ||
140 | static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate, | |
141 | unsigned long parent_rate) | |
142 | { | |
20411dad | 143 | struct dra7_atl_desc *cdesc; |
9ac33b0c PU |
144 | u32 divider; |
145 | ||
20411dad NM |
146 | if (!hw || !rate) |
147 | return -EINVAL; | |
148 | ||
149 | cdesc = to_atl_desc(hw); | |
9ac33b0c PU |
150 | divider = ((parent_rate + rate / 2) / rate) - 1; |
151 | if (divider > DRA7_ATL_DIVIDER_MASK) | |
152 | divider = DRA7_ATL_DIVIDER_MASK; | |
153 | ||
154 | cdesc->divider = divider + 1; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
412d6b47 | 159 | static const struct clk_ops atl_clk_ops = { |
9ac33b0c PU |
160 | .enable = atl_clk_enable, |
161 | .disable = atl_clk_disable, | |
162 | .is_enabled = atl_clk_is_enabled, | |
163 | .recalc_rate = atl_clk_recalc_rate, | |
164 | .round_rate = atl_clk_round_rate, | |
165 | .set_rate = atl_clk_set_rate, | |
166 | }; | |
167 | ||
168 | static void __init of_dra7_atl_clock_setup(struct device_node *node) | |
169 | { | |
170 | struct dra7_atl_desc *clk_hw = NULL; | |
412d6b47 | 171 | struct clk_init_data init = { NULL }; |
9ac33b0c PU |
172 | const char **parent_names = NULL; |
173 | struct clk *clk; | |
174 | ||
175 | clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); | |
176 | if (!clk_hw) { | |
177 | pr_err("%s: could not allocate dra7_atl_desc\n", __func__); | |
178 | return; | |
179 | } | |
180 | ||
181 | clk_hw->hw.init = &init; | |
182 | clk_hw->divider = 1; | |
183 | init.name = node->name; | |
184 | init.ops = &atl_clk_ops; | |
185 | init.flags = CLK_IGNORE_UNUSED; | |
186 | init.num_parents = of_clk_get_parent_count(node); | |
187 | ||
188 | if (init.num_parents != 1) { | |
189 | pr_err("%s: atl clock %s must have 1 parent\n", __func__, | |
190 | node->name); | |
191 | goto cleanup; | |
192 | } | |
193 | ||
194 | parent_names = kzalloc(sizeof(char *), GFP_KERNEL); | |
195 | ||
196 | if (!parent_names) | |
197 | goto cleanup; | |
198 | ||
199 | parent_names[0] = of_clk_get_parent_name(node, 0); | |
200 | ||
201 | init.parent_names = parent_names; | |
202 | ||
203 | clk = clk_register(NULL, &clk_hw->hw); | |
204 | ||
205 | if (!IS_ERR(clk)) { | |
206 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
73b5d5f7 | 207 | kfree(parent_names); |
9ac33b0c PU |
208 | return; |
209 | } | |
210 | cleanup: | |
211 | kfree(parent_names); | |
212 | kfree(clk_hw); | |
213 | } | |
214 | CLK_OF_DECLARE(dra7_atl_clock, "ti,dra7-atl-clock", of_dra7_atl_clock_setup); | |
215 | ||
216 | static int of_dra7_atl_clk_probe(struct platform_device *pdev) | |
217 | { | |
218 | struct device_node *node = pdev->dev.of_node; | |
219 | struct dra7_atl_clock_info *cinfo; | |
220 | int i; | |
221 | int ret = 0; | |
222 | ||
223 | if (!node) | |
224 | return -ENODEV; | |
225 | ||
226 | cinfo = devm_kzalloc(&pdev->dev, sizeof(*cinfo), GFP_KERNEL); | |
227 | if (!cinfo) | |
228 | return -ENOMEM; | |
229 | ||
230 | cinfo->iobase = of_iomap(node, 0); | |
231 | cinfo->dev = &pdev->dev; | |
232 | pm_runtime_enable(cinfo->dev); | |
04ed831f | 233 | pm_runtime_irq_safe(cinfo->dev); |
9ac33b0c PU |
234 | |
235 | pm_runtime_get_sync(cinfo->dev); | |
236 | atl_write(cinfo, DRA7_ATL_PCLKMUX_REG(0), DRA7_ATL_PCLKMUX); | |
237 | ||
238 | for (i = 0; i < DRA7_ATL_INSTANCES; i++) { | |
239 | struct device_node *cfg_node; | |
240 | char prop[5]; | |
241 | struct dra7_atl_desc *cdesc; | |
242 | struct of_phandle_args clkspec; | |
243 | struct clk *clk; | |
244 | int rc; | |
245 | ||
246 | rc = of_parse_phandle_with_args(node, "ti,provided-clocks", | |
247 | NULL, i, &clkspec); | |
248 | ||
249 | if (rc) { | |
250 | pr_err("%s: failed to lookup atl clock %d\n", __func__, | |
251 | i); | |
252 | return -EINVAL; | |
253 | } | |
254 | ||
255 | clk = of_clk_get_from_provider(&clkspec); | |
e0cdcda5 KK |
256 | if (IS_ERR(clk)) { |
257 | pr_err("%s: failed to get atl clock %d from provider\n", | |
258 | __func__, i); | |
259 | return PTR_ERR(clk); | |
260 | } | |
9ac33b0c PU |
261 | |
262 | cdesc = to_atl_desc(__clk_get_hw(clk)); | |
263 | cdesc->cinfo = cinfo; | |
264 | cdesc->id = i; | |
265 | ||
266 | /* Get configuration for the ATL instances */ | |
267 | snprintf(prop, sizeof(prop), "atl%u", i); | |
268 | cfg_node = of_find_node_by_name(node, prop); | |
269 | if (cfg_node) { | |
270 | ret = of_property_read_u32(cfg_node, "bws", | |
271 | &cdesc->bws); | |
272 | ret |= of_property_read_u32(cfg_node, "aws", | |
273 | &cdesc->aws); | |
274 | if (!ret) { | |
275 | cdesc->valid = true; | |
276 | atl_write(cinfo, DRA7_ATL_BWSMUX_REG(i), | |
277 | cdesc->bws); | |
278 | atl_write(cinfo, DRA7_ATL_AWSMUX_REG(i), | |
279 | cdesc->aws); | |
280 | } | |
281 | } | |
282 | ||
283 | cdesc->probed = true; | |
284 | /* | |
285 | * Enable the clock if it has been asked prior to loading the | |
286 | * hw driver | |
287 | */ | |
288 | if (cdesc->enabled) | |
289 | atl_clk_enable(__clk_get_hw(clk)); | |
290 | } | |
291 | pm_runtime_put_sync(cinfo->dev); | |
292 | ||
293 | return ret; | |
294 | } | |
295 | ||
296 | static int of_dra7_atl_clk_remove(struct platform_device *pdev) | |
297 | { | |
298 | pm_runtime_disable(&pdev->dev); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
f375573c | 303 | static const struct of_device_id of_dra7_atl_clk_match_tbl[] = { |
9ac33b0c PU |
304 | { .compatible = "ti,dra7-atl", }, |
305 | {}, | |
306 | }; | |
307 | MODULE_DEVICE_TABLE(of, of_dra7_atl_clk_match_tbl); | |
308 | ||
309 | static struct platform_driver dra7_atl_clk_driver = { | |
310 | .driver = { | |
311 | .name = "dra7-atl", | |
9ac33b0c PU |
312 | .of_match_table = of_dra7_atl_clk_match_tbl, |
313 | }, | |
314 | .probe = of_dra7_atl_clk_probe, | |
315 | .remove = of_dra7_atl_clk_remove, | |
316 | }; | |
317 | ||
318 | module_platform_driver(dra7_atl_clk_driver); | |
319 | ||
320 | MODULE_DESCRIPTION("Clock driver for DRA7 Audio Tracking Logic"); | |
321 | MODULE_ALIAS("platform:dra7-atl-clock"); | |
322 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
323 | MODULE_LICENSE("GPL v2"); |