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1 | /* |
2 | * TX4939 internal RTC driver |
3 | * Based on RBTX49xx patch from CELF patch archive. |
4 | * |
5 | * This file is subject to the terms and conditions of the GNU General Public |
6 | * License. See the file "COPYING" in the main directory of this archive |
7 | * for more details. |
8 | * |
9 | * (C) Copyright TOSHIBA CORPORATION 2005-2007 |
10 | */ |
11 | #include <linux/rtc.h> |
12 | #include <linux/platform_device.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/io.h> |
15 | #include <linux/gfp.h> |
16 | #include <asm/txx9/tx4939.h> |
17 | |
18 | struct tx4939rtc_plat_data { |
19 | struct rtc_device *rtc; |
20 | struct tx4939_rtc_reg __iomem *rtcreg; |
21 | spinlock_t lock; |
22 | }; |
23 | |
24 | static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev) |
25 | { |
26 | return platform_get_drvdata(to_platform_device(dev)); |
27 | } |
28 | |
29 | static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd) |
30 | { |
31 | int i = 0; |
32 | |
33 | __raw_writel(cmd, &rtcreg->ctl); |
34 | /* This might take 30us (next 32.768KHz clock) */ |
35 | while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) { |
36 | /* timeout on approx. 100us (@ GBUS200MHz) */ |
37 | if (i++ > 200 * 100) |
38 | return -EBUSY; |
39 | cpu_relax(); |
40 | } |
41 | return 0; |
42 | } |
43 | |
44 | static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs) |
45 | { |
46 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
47 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
48 | int i, ret; |
49 | unsigned char buf[6]; |
50 | |
51 | buf[0] = 0; |
52 | buf[1] = 0; |
53 | buf[2] = secs; |
54 | buf[3] = secs >> 8; |
55 | buf[4] = secs >> 16; |
56 | buf[5] = secs >> 24; |
57 | spin_lock_irq(&pdata->lock); |
58 | __raw_writel(0, &rtcreg->adr); |
59 | for (i = 0; i < 6; i++) |
60 | __raw_writel(buf[i], &rtcreg->dat); |
61 | ret = tx4939_rtc_cmd(rtcreg, |
62 | TX4939_RTCCTL_COMMAND_SETTIME | |
63 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
64 | spin_unlock_irq(&pdata->lock); |
65 | return ret; |
66 | } |
67 | |
68 | static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm) |
69 | { |
70 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
71 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
72 | int i, ret; |
73 | unsigned long sec; |
74 | unsigned char buf[6]; |
75 | |
76 | spin_lock_irq(&pdata->lock); |
77 | ret = tx4939_rtc_cmd(rtcreg, |
78 | TX4939_RTCCTL_COMMAND_GETTIME | |
79 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
80 | if (ret) { |
81 | spin_unlock_irq(&pdata->lock); |
82 | return ret; |
83 | } |
84 | __raw_writel(2, &rtcreg->adr); |
85 | for (i = 2; i < 6; i++) |
86 | buf[i] = __raw_readl(&rtcreg->dat); |
87 | spin_unlock_irq(&pdata->lock); |
88 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
89 | rtc_time_to_tm(sec, tm); |
90 | return rtc_valid_tm(tm); |
91 | } |
92 | |
93 | static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
94 | { |
95 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
96 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
97 | int i, ret; |
98 | unsigned long sec; |
99 | unsigned char buf[6]; |
100 | |
101 | if (alrm->time.tm_sec < 0 || |
102 | alrm->time.tm_min < 0 || |
103 | alrm->time.tm_hour < 0 || |
104 | alrm->time.tm_mday < 0 || |
105 | alrm->time.tm_mon < 0 || |
106 | alrm->time.tm_year < 0) |
107 | return -EINVAL; |
108 | rtc_tm_to_time(&alrm->time, &sec); |
109 | buf[0] = 0; |
110 | buf[1] = 0; |
111 | buf[2] = sec; |
112 | buf[3] = sec >> 8; |
113 | buf[4] = sec >> 16; |
114 | buf[5] = sec >> 24; |
115 | spin_lock_irq(&pdata->lock); |
116 | __raw_writel(0, &rtcreg->adr); |
117 | for (i = 0; i < 6; i++) |
118 | __raw_writel(buf[i], &rtcreg->dat); |
119 | ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM | |
120 | (alrm->enabled ? TX4939_RTCCTL_ALME : 0)); |
121 | spin_unlock_irq(&pdata->lock); |
122 | return ret; |
123 | } |
124 | |
125 | static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
126 | { |
127 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
128 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
129 | int i, ret; |
130 | unsigned long sec; |
131 | unsigned char buf[6]; |
132 | u32 ctl; |
133 | |
134 | spin_lock_irq(&pdata->lock); |
135 | ret = tx4939_rtc_cmd(rtcreg, |
136 | TX4939_RTCCTL_COMMAND_GETALARM | |
137 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
138 | if (ret) { |
139 | spin_unlock_irq(&pdata->lock); |
140 | return ret; |
141 | } |
142 | __raw_writel(2, &rtcreg->adr); |
143 | for (i = 2; i < 6; i++) |
144 | buf[i] = __raw_readl(&rtcreg->dat); |
145 | ctl = __raw_readl(&rtcreg->ctl); |
146 | alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0; |
147 | alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0; |
148 | spin_unlock_irq(&pdata->lock); |
149 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
150 | rtc_time_to_tm(sec, &alrm->time); |
151 | return rtc_valid_tm(&alrm->time); |
152 | } |
153 | |
154 | static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
155 | { |
156 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
157 | |
158 | spin_lock_irq(&pdata->lock); |
159 | tx4939_rtc_cmd(pdata->rtcreg, |
160 | TX4939_RTCCTL_COMMAND_NOP | |
161 | (enabled ? TX4939_RTCCTL_ALME : 0)); |
162 | spin_unlock_irq(&pdata->lock); |
163 | return 0; |
164 | } |
165 | |
166 | static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id) |
167 | { |
168 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id); |
169 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
170 | unsigned long events = RTC_IRQF; |
171 | |
172 | spin_lock(&pdata->lock); |
173 | if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) { |
174 | events |= RTC_AF; |
175 | tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
176 | } |
177 | spin_unlock(&pdata->lock); |
178 | if (likely(pdata->rtc)) |
179 | rtc_update_irq(pdata->rtc, 1, events); |
180 | return IRQ_HANDLED; |
181 | } |
182 | |
183 | static const struct rtc_class_ops tx4939_rtc_ops = { |
184 | .read_time = tx4939_rtc_read_time, |
185 | .read_alarm = tx4939_rtc_read_alarm, |
186 | .set_alarm = tx4939_rtc_set_alarm, |
187 | .set_mmss = tx4939_rtc_set_mmss, |
188 | .alarm_irq_enable = tx4939_rtc_alarm_irq_enable, |
189 | }; |
190 | |
191 | static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj, |
192 | struct bin_attribute *bin_attr, |
193 | char *buf, loff_t pos, size_t size) |
194 | { |
195 | struct device *dev = container_of(kobj, struct device, kobj); |
196 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
197 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
198 | ssize_t count; |
199 | |
200 | spin_lock_irq(&pdata->lock); |
201 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
202 | count++, size--) { |
203 | __raw_writel(pos++, &rtcreg->adr); |
204 | *buf++ = __raw_readl(&rtcreg->dat); |
205 | } |
206 | spin_unlock_irq(&pdata->lock); |
207 | return count; |
208 | } |
209 | |
210 | static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj, |
211 | struct bin_attribute *bin_attr, |
212 | char *buf, loff_t pos, size_t size) |
213 | { |
214 | struct device *dev = container_of(kobj, struct device, kobj); |
215 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
216 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
217 | ssize_t count; |
218 | |
219 | spin_lock_irq(&pdata->lock); |
220 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
221 | count++, size--) { |
222 | __raw_writel(pos++, &rtcreg->adr); |
223 | __raw_writel(*buf++, &rtcreg->dat); |
224 | } |
225 | spin_unlock_irq(&pdata->lock); |
226 | return count; |
227 | } |
228 | |
229 | static struct bin_attribute tx4939_rtc_nvram_attr = { |
230 | .attr = { |
231 | .name = "nvram", |
232 | .mode = S_IRUGO | S_IWUSR, |
233 | }, |
234 | .size = TX4939_RTC_REG_RAMSIZE, |
235 | .read = tx4939_rtc_nvram_read, |
236 | .write = tx4939_rtc_nvram_write, |
237 | }; |
238 | |
239 | static int __init tx4939_rtc_probe(struct platform_device *pdev) |
240 | { |
241 | struct rtc_device *rtc; |
242 | struct tx4939rtc_plat_data *pdata; |
243 | struct resource *res; |
244 | int irq, ret; |
245 | |
246 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
247 | if (!res) |
248 | return -ENODEV; |
249 | irq = platform_get_irq(pdev, 0); |
250 | if (irq < 0) |
251 | return -ENODEV; |
252 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
253 | if (!pdata) |
254 | return -ENOMEM; |
255 | platform_set_drvdata(pdev, pdata); |
256 | |
257 | if (!devm_request_mem_region(&pdev->dev, res->start, |
258 | resource_size(res), pdev->name)) |
259 | return -EBUSY; |
260 | pdata->rtcreg = devm_ioremap(&pdev->dev, res->start, |
261 | resource_size(res)); |
262 | if (!pdata->rtcreg) |
263 | return -EBUSY; |
264 | |
265 | spin_lock_init(&pdata->lock); |
266 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
267 | if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt, |
268 | IRQF_DISABLED, pdev->name, &pdev->dev) < 0) |
269 | return -EBUSY; |
270 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
271 | &tx4939_rtc_ops, THIS_MODULE); |
272 | if (IS_ERR(rtc)) |
273 | return PTR_ERR(rtc); |
274 | pdata->rtc = rtc; |
275 | ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); |
276 | if (ret) |
277 | rtc_device_unregister(rtc); |
278 | return ret; |
279 | } |
280 | |
281 | static int __exit tx4939_rtc_remove(struct platform_device *pdev) |
282 | { |
283 | struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev); |
284 | |
285 | sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); |
286 | rtc_device_unregister(pdata->rtc); |
287 | spin_lock_irq(&pdata->lock); |
288 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
289 | spin_unlock_irq(&pdata->lock); |
290 | return 0; |
291 | } |
292 | |
293 | static struct platform_driver tx4939_rtc_driver = { |
294 | .remove = __exit_p(tx4939_rtc_remove), |
295 | .driver = { |
296 | .name = "tx4939rtc", |
297 | .owner = THIS_MODULE, |
298 | }, |
299 | }; |
300 | |
301 | static int __init tx4939rtc_init(void) |
302 | { |
303 | return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe); |
304 | } |
305 | |
306 | static void __exit tx4939rtc_exit(void) |
307 | { |
308 | platform_driver_unregister(&tx4939_rtc_driver); |
309 | } |
310 | |
311 | module_init(tx4939rtc_init); |
312 | module_exit(tx4939rtc_exit); |
313 | |
314 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); |
315 | MODULE_DESCRIPTION("TX4939 internal RTC driver"); |
316 | MODULE_LICENSE("GPL"); |
317 | MODULE_ALIAS("platform:tx4939rtc"); |
318 |
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