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9#include <linux/bitfield.h>
10#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/module.h>
13#include <linux/of_platform.h>
14#include <linux/pinctrl/consumer.h>
15#include <linux/reset.h>
16
17#include <sound/dmaengine_pcm.h>
18#include <sound/core.h>
19
20#include "stm32_sai.h"
21
22static const struct stm32_sai_conf stm32_sai_conf_f4 = {
23 .version = STM_SAI_STM32F4,
24 .fifo_size = 8,
25 .has_spdif_pdm = false,
26};
27
28
29
30
31
32
33static const struct stm32_sai_conf stm32_sai_conf_h7 = {
34 .version = STM_SAI_STM32H7,
35 .fifo_size = 8,
36 .has_spdif_pdm = true,
37};
38
39static const struct of_device_id stm32_sai_ids[] = {
40 { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
41 { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
42 {}
43};
44
45static int stm32_sai_pclk_disable(struct device *dev)
46{
47 struct stm32_sai_data *sai = dev_get_drvdata(dev);
48
49 clk_disable_unprepare(sai->pclk);
50
51 return 0;
52}
53
54static int stm32_sai_pclk_enable(struct device *dev)
55{
56 struct stm32_sai_data *sai = dev_get_drvdata(dev);
57 int ret;
58
59 ret = clk_prepare_enable(sai->pclk);
60 if (ret) {
61 dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
62 return ret;
63 }
64
65 return 0;
66}
67
68static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci)
69{
70 int ret;
71
72
73 ret = stm32_sai_pclk_enable(&sai->pdev->dev);
74 if (ret)
75 return ret;
76
77 writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base);
78
79 stm32_sai_pclk_disable(&sai->pdev->dev);
80
81 return 0;
82}
83
84static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco)
85{
86 u32 prev_synco;
87 int ret;
88
89
90 ret = stm32_sai_pclk_enable(&sai->pdev->dev);
91 if (ret)
92 return ret;
93
94 dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n",
95 sai->pdev->dev.of_node,
96 synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
97
98 prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base));
99 if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) {
100 dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n",
101 sai->pdev->dev.of_node,
102 prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
103 stm32_sai_pclk_disable(&sai->pdev->dev);
104 return -EINVAL;
105 }
106
107 writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base);
108
109 stm32_sai_pclk_disable(&sai->pdev->dev);
110
111 return 0;
112}
113
114static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
115 struct device_node *np_provider,
116 int synco, int synci)
117{
118 struct platform_device *pdev = of_find_device_by_node(np_provider);
119 struct stm32_sai_data *sai_provider;
120 int ret;
121
122 if (!pdev) {
123 dev_err(&sai_client->pdev->dev,
124 "Device not found for node %pOFn\n", np_provider);
125 of_node_put(np_provider);
126 return -ENODEV;
127 }
128
129 sai_provider = platform_get_drvdata(pdev);
130 if (!sai_provider) {
131 dev_err(&sai_client->pdev->dev,
132 "SAI sync provider data not found\n");
133 ret = -EINVAL;
134 goto error;
135 }
136
137
138 ret = stm32_sai_sync_conf_client(sai_client, synci);
139 if (ret < 0)
140 goto error;
141
142
143 ret = stm32_sai_sync_conf_provider(sai_provider, synco);
144
145error:
146 put_device(&pdev->dev);
147 of_node_put(np_provider);
148 return ret;
149}
150
151static int stm32_sai_probe(struct platform_device *pdev)
152{
153 struct stm32_sai_data *sai;
154 struct reset_control *rst;
155 const struct of_device_id *of_id;
156 u32 val;
157 int ret;
158
159 sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
160 if (!sai)
161 return -ENOMEM;
162
163 sai->base = devm_platform_ioremap_resource(pdev, 0);
164 if (IS_ERR(sai->base))
165 return PTR_ERR(sai->base);
166
167 of_id = of_match_device(stm32_sai_ids, &pdev->dev);
168 if (of_id)
169 memcpy(&sai->conf, (const struct stm32_sai_conf *)of_id->data,
170 sizeof(struct stm32_sai_conf));
171 else
172 return -EINVAL;
173
174 if (!STM_SAI_IS_F4(sai)) {
175 sai->pclk = devm_clk_get(&pdev->dev, "pclk");
176 if (IS_ERR(sai->pclk)) {
177 if (PTR_ERR(sai->pclk) != -EPROBE_DEFER)
178 dev_err(&pdev->dev, "missing bus clock pclk: %ld\n",
179 PTR_ERR(sai->pclk));
180 return PTR_ERR(sai->pclk);
181 }
182 }
183
184 sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
185 if (IS_ERR(sai->clk_x8k)) {
186 if (PTR_ERR(sai->clk_x8k) != -EPROBE_DEFER)
187 dev_err(&pdev->dev, "missing x8k parent clock: %ld\n",
188 PTR_ERR(sai->clk_x8k));
189 return PTR_ERR(sai->clk_x8k);
190 }
191
192 sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
193 if (IS_ERR(sai->clk_x11k)) {
194 if (PTR_ERR(sai->clk_x11k) != -EPROBE_DEFER)
195 dev_err(&pdev->dev, "missing x11k parent clock: %ld\n",
196 PTR_ERR(sai->clk_x11k));
197 return PTR_ERR(sai->clk_x11k);
198 }
199
200
201 sai->irq = platform_get_irq(pdev, 0);
202 if (sai->irq < 0)
203 return sai->irq;
204
205
206 rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
207 if (IS_ERR(rst)) {
208 if (PTR_ERR(rst) != -EPROBE_DEFER)
209 dev_err(&pdev->dev, "Reset controller error %ld\n",
210 PTR_ERR(rst));
211 return PTR_ERR(rst);
212 }
213 reset_control_assert(rst);
214 udelay(2);
215 reset_control_deassert(rst);
216
217
218 ret = clk_prepare_enable(sai->pclk);
219 if (ret) {
220 dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
221 return ret;
222 }
223
224 val = FIELD_GET(SAI_IDR_ID_MASK,
225 readl_relaxed(sai->base + STM_SAI_IDR));
226 if (val == SAI_IPIDR_NUMBER) {
227 val = readl_relaxed(sai->base + STM_SAI_HWCFGR);
228 sai->conf.fifo_size = FIELD_GET(SAI_HWCFGR_FIFO_SIZE, val);
229 sai->conf.has_spdif_pdm = !!FIELD_GET(SAI_HWCFGR_SPDIF_PDM,
230 val);
231
232 val = readl_relaxed(sai->base + STM_SAI_VERR);
233 sai->conf.version = val;
234
235 dev_dbg(&pdev->dev, "SAI version: %lu.%lu registered\n",
236 FIELD_GET(SAI_VERR_MAJ_MASK, val),
237 FIELD_GET(SAI_VERR_MIN_MASK, val));
238 }
239 clk_disable_unprepare(sai->pclk);
240
241 sai->pdev = pdev;
242 sai->set_sync = &stm32_sai_set_sync;
243 platform_set_drvdata(pdev, sai);
244
245 return devm_of_platform_populate(&pdev->dev);
246}
247
248#ifdef CONFIG_PM_SLEEP
249
250
251
252
253
254static int stm32_sai_suspend(struct device *dev)
255{
256 struct stm32_sai_data *sai = dev_get_drvdata(dev);
257 int ret;
258
259 ret = stm32_sai_pclk_enable(dev);
260 if (ret)
261 return ret;
262
263 sai->gcr = readl_relaxed(sai->base);
264 stm32_sai_pclk_disable(dev);
265
266 return pinctrl_pm_select_sleep_state(dev);
267}
268
269static int stm32_sai_resume(struct device *dev)
270{
271 struct stm32_sai_data *sai = dev_get_drvdata(dev);
272 int ret;
273
274 ret = stm32_sai_pclk_enable(dev);
275 if (ret)
276 return ret;
277
278 writel_relaxed(sai->gcr, sai->base);
279 stm32_sai_pclk_disable(dev);
280
281 return pinctrl_pm_select_default_state(dev);
282}
283#endif
284
285static const struct dev_pm_ops stm32_sai_pm_ops = {
286 SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_suspend, stm32_sai_resume)
287};
288
289MODULE_DEVICE_TABLE(of, stm32_sai_ids);
290
291static struct platform_driver stm32_sai_driver = {
292 .driver = {
293 .name = "st,stm32-sai",
294 .of_match_table = stm32_sai_ids,
295 .pm = &stm32_sai_pm_ops,
296 },
297 .probe = stm32_sai_probe,
298};
299
300module_platform_driver(stm32_sai_driver);
301
302MODULE_DESCRIPTION("STM32 Soc SAI Interface");
303MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>");
304MODULE_ALIAS("platform:st,stm32-sai");
305MODULE_LICENSE("GPL v2");
306
