1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * DRA7 ATL (Audio Tracking Logic) clock driver
4 *
5 * Copyright (C) 2013 Texas Instruments, Inc.
6 *
7 * Peter Ujfalusi <peter.ujfalusi@ti.com>
8 */
9
10 #include <linux/init.h>
11 #include <linux/clk.h>
12 #include <linux/clk-provider.h>
13 #include <linux/slab.h>
14 #include <linux/io.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/clk/ti.h>
20
21 #include "clock.h"
22
23 #define DRA7_ATL_INSTANCES 4
24
25 #define DRA7_ATL_PPMR_REG(id) (0x200 + (id * 0x80))
26 #define DRA7_ATL_BBSR_REG(id) (0x204 + (id * 0x80))
27 #define DRA7_ATL_ATLCR_REG(id) (0x208 + (id * 0x80))
28 #define DRA7_ATL_SWEN_REG(id) (0x210 + (id * 0x80))
29 #define DRA7_ATL_BWSMUX_REG(id) (0x214 + (id * 0x80))
30 #define DRA7_ATL_AWSMUX_REG(id) (0x218 + (id * 0x80))
31 #define DRA7_ATL_PCLKMUX_REG(id) (0x21c + (id * 0x80))
32
33 #define DRA7_ATL_SWEN BIT(0)
34 #define DRA7_ATL_DIVIDER_MASK (0x1f)
35 #define DRA7_ATL_PCLKMUX BIT(0)
36 struct dra7_atl_clock_info;
37
38 struct dra7_atl_desc {
39 struct clk *clk;
40 struct clk_hw hw;
41 struct dra7_atl_clock_info *cinfo;
42 int id;
43
44 bool probed; /* the driver for the IP has been loaded */
45 bool valid; /* configured */
46 bool enabled;
47 u32 bws; /* Baseband Word Select Mux */
48 u32 aws; /* Audio Word Select Mux */
49 u32 divider; /* Cached divider value */
50 };
51
52 struct dra7_atl_clock_info {
53 struct device *dev;
54 void __iomem *iobase;
55
56 struct dra7_atl_desc *cdesc;
57 };
58
59 #define to_atl_desc(_hw) container_of(_hw, struct dra7_atl_desc, hw)
60
atl_write(struct dra7_atl_clock_info * cinfo,u32 reg,u32 val)61 static inline void atl_write(struct dra7_atl_clock_info *cinfo, u32 reg,
62 u32 val)
63 {
64 __raw_writel(val, cinfo->iobase + reg);
65 }
66
atl_read(struct dra7_atl_clock_info * cinfo,u32 reg)67 static inline int atl_read(struct dra7_atl_clock_info *cinfo, u32 reg)
68 {
69 return __raw_readl(cinfo->iobase + reg);
70 }
71
atl_clk_enable(struct clk_hw * hw)72 static int atl_clk_enable(struct clk_hw *hw)
73 {
74 struct dra7_atl_desc *cdesc = to_atl_desc(hw);
75
76 if (!cdesc->probed)
77 goto out;
78
79 if (unlikely(!cdesc->valid))
80 dev_warn(cdesc->cinfo->dev, "atl%d has not been configured\n",
81 cdesc->id);
82 pm_runtime_get_sync(cdesc->cinfo->dev);
83
84 atl_write(cdesc->cinfo, DRA7_ATL_ATLCR_REG(cdesc->id),
85 cdesc->divider - 1);
86 atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), DRA7_ATL_SWEN);
87
88 out:
89 cdesc->enabled = true;
90
91 return 0;
92 }
93
atl_clk_disable(struct clk_hw * hw)94 static void atl_clk_disable(struct clk_hw *hw)
95 {
96 struct dra7_atl_desc *cdesc = to_atl_desc(hw);
97
98 if (!cdesc->probed)
99 goto out;
100
101 atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), 0);
102 pm_runtime_put_sync(cdesc->cinfo->dev);
103
104 out:
105 cdesc->enabled = false;
106 }
107
atl_clk_is_enabled(struct clk_hw * hw)108 static int atl_clk_is_enabled(struct clk_hw *hw)
109 {
110 struct dra7_atl_desc *cdesc = to_atl_desc(hw);
111
112 return cdesc->enabled;
113 }
114
atl_clk_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)115 static unsigned long atl_clk_recalc_rate(struct clk_hw *hw,
116 unsigned long parent_rate)
117 {
118 struct dra7_atl_desc *cdesc = to_atl_desc(hw);
119
120 return parent_rate / cdesc->divider;
121 }
122
atl_clk_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)123 static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate,
124 unsigned long *parent_rate)
125 {
126 unsigned divider;
127
128 divider = (*parent_rate + rate / 2) / rate;
129 if (divider > DRA7_ATL_DIVIDER_MASK + 1)
130 divider = DRA7_ATL_DIVIDER_MASK + 1;
131
132 return *parent_rate / divider;
133 }
134
atl_clk_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)135 static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate,
136 unsigned long parent_rate)
137 {
138 struct dra7_atl_desc *cdesc;
139 u32 divider;
140
141 if (!hw || !rate)
142 return -EINVAL;
143
144 cdesc = to_atl_desc(hw);
145 divider = ((parent_rate + rate / 2) / rate) - 1;
146 if (divider > DRA7_ATL_DIVIDER_MASK)
147 divider = DRA7_ATL_DIVIDER_MASK;
148
149 cdesc->divider = divider + 1;
150
151 return 0;
152 }
153
154 static const struct clk_ops atl_clk_ops = {
155 .enable = atl_clk_enable,
156 .disable = atl_clk_disable,
157 .is_enabled = atl_clk_is_enabled,
158 .recalc_rate = atl_clk_recalc_rate,
159 .round_rate = atl_clk_round_rate,
160 .set_rate = atl_clk_set_rate,
161 };
162
of_dra7_atl_clock_setup(struct device_node * node)163 static void __init of_dra7_atl_clock_setup(struct device_node *node)
164 {
165 struct dra7_atl_desc *clk_hw = NULL;
166 struct clk_parent_data pdata = { .index = 0 };
167 struct clk_init_data init = { NULL };
168 const char *name;
169 struct clk *clk;
170
171 clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
172 if (!clk_hw) {
173 pr_err("%s: could not allocate dra7_atl_desc\n", __func__);
174 return;
175 }
176
177 clk_hw->hw.init = &init;
178 clk_hw->divider = 1;
179 name = ti_dt_clk_name(node);
180 init.name = name;
181 init.ops = &atl_clk_ops;
182 init.flags = CLK_IGNORE_UNUSED;
183 init.num_parents = of_clk_get_parent_count(node);
184
185 if (init.num_parents != 1) {
186 pr_err("%s: atl clock %pOFn must have 1 parent\n", __func__,
187 node);
188 goto cleanup;
189 }
190
191 init.parent_data = &pdata;
192 clk = of_ti_clk_register(node, &clk_hw->hw, name);
193
194 if (!IS_ERR(clk)) {
195 of_clk_add_provider(node, of_clk_src_simple_get, clk);
196 return;
197 }
198 cleanup:
199 kfree(clk_hw);
200 }
201 CLK_OF_DECLARE(dra7_atl_clock, "ti,dra7-atl-clock", of_dra7_atl_clock_setup);
202
of_dra7_atl_clk_probe(struct platform_device * pdev)203 static int of_dra7_atl_clk_probe(struct platform_device *pdev)
204 {
205 struct device_node *node = pdev->dev.of_node;
206 struct dra7_atl_clock_info *cinfo;
207 int i;
208 int ret = 0;
209
210 if (!node)
211 return -ENODEV;
212
213 cinfo = devm_kzalloc(&pdev->dev, sizeof(*cinfo), GFP_KERNEL);
214 if (!cinfo)
215 return -ENOMEM;
216
217 cinfo->iobase = of_iomap(node, 0);
218 cinfo->dev = &pdev->dev;
219 pm_runtime_enable(cinfo->dev);
220
221 pm_runtime_get_sync(cinfo->dev);
222 atl_write(cinfo, DRA7_ATL_PCLKMUX_REG(0), DRA7_ATL_PCLKMUX);
223
224 for (i = 0; i < DRA7_ATL_INSTANCES; i++) {
225 struct device_node *cfg_node;
226 char prop[5];
227 struct dra7_atl_desc *cdesc;
228 struct of_phandle_args clkspec;
229 struct clk *clk;
230 int rc;
231
232 rc = of_parse_phandle_with_args(node, "ti,provided-clocks",
233 NULL, i, &clkspec);
234
235 if (rc) {
236 pr_err("%s: failed to lookup atl clock %d\n", __func__,
237 i);
238 ret = -EINVAL;
239 goto pm_put;
240 }
241
242 clk = of_clk_get_from_provider(&clkspec);
243 of_node_put(clkspec.np);
244 if (IS_ERR(clk)) {
245 pr_err("%s: failed to get atl clock %d from provider\n",
246 __func__, i);
247 ret = PTR_ERR(clk);
248 goto pm_put;
249 }
250
251 cdesc = to_atl_desc(__clk_get_hw(clk));
252 cdesc->cinfo = cinfo;
253 cdesc->id = i;
254
255 /* Get configuration for the ATL instances */
256 snprintf(prop, sizeof(prop), "atl%u", i);
257 cfg_node = of_get_child_by_name(node, prop);
258 if (cfg_node) {
259 ret = of_property_read_u32(cfg_node, "bws",
260 &cdesc->bws);
261 ret |= of_property_read_u32(cfg_node, "aws",
262 &cdesc->aws);
263 if (!ret) {
264 cdesc->valid = true;
265 atl_write(cinfo, DRA7_ATL_BWSMUX_REG(i),
266 cdesc->bws);
267 atl_write(cinfo, DRA7_ATL_AWSMUX_REG(i),
268 cdesc->aws);
269 }
270 of_node_put(cfg_node);
271 }
272
273 cdesc->probed = true;
274 /*
275 * Enable the clock if it has been asked prior to loading the
276 * hw driver
277 */
278 if (cdesc->enabled)
279 atl_clk_enable(__clk_get_hw(clk));
280 }
281
282 pm_put:
283 pm_runtime_put_sync(cinfo->dev);
284 return ret;
285 }
286
287 static const struct of_device_id of_dra7_atl_clk_match_tbl[] = {
288 { .compatible = "ti,dra7-atl", },
289 {},
290 };
291
292 static struct platform_driver dra7_atl_clk_driver = {
293 .driver = {
294 .name = "dra7-atl",
295 .suppress_bind_attrs = true,
296 .of_match_table = of_dra7_atl_clk_match_tbl,
297 },
298 .probe = of_dra7_atl_clk_probe,
299 };
300 builtin_platform_driver(dra7_atl_clk_driver);
301