Commit | Line | Data |
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0e149233 AN |
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 <asm/txx9/tx4939.h> | |
16 | ||
17 | struct tx4939rtc_plat_data { | |
18 | struct rtc_device *rtc; | |
19 | struct tx4939_rtc_reg __iomem *rtcreg; | |
af69a180 | 20 | spinlock_t lock; |
0e149233 AN |
21 | }; |
22 | ||
23 | static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev) | |
24 | { | |
25 | return platform_get_drvdata(to_platform_device(dev)); | |
26 | } | |
27 | ||
28 | static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd) | |
29 | { | |
30 | int i = 0; | |
31 | ||
32 | __raw_writel(cmd, &rtcreg->ctl); | |
33 | /* This might take 30us (next 32.768KHz clock) */ | |
34 | while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) { | |
35 | /* timeout on approx. 100us (@ GBUS200MHz) */ | |
36 | if (i++ > 200 * 100) | |
37 | return -EBUSY; | |
38 | cpu_relax(); | |
39 | } | |
40 | return 0; | |
41 | } | |
42 | ||
43 | static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs) | |
44 | { | |
45 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
46 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
47 | int i, ret; | |
48 | unsigned char buf[6]; | |
49 | ||
50 | buf[0] = 0; | |
51 | buf[1] = 0; | |
52 | buf[2] = secs; | |
53 | buf[3] = secs >> 8; | |
54 | buf[4] = secs >> 16; | |
55 | buf[5] = secs >> 24; | |
af69a180 | 56 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
57 | __raw_writel(0, &rtcreg->adr); |
58 | for (i = 0; i < 6; i++) | |
59 | __raw_writel(buf[i], &rtcreg->dat); | |
60 | ret = tx4939_rtc_cmd(rtcreg, | |
61 | TX4939_RTCCTL_COMMAND_SETTIME | | |
62 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
af69a180 | 63 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
64 | return ret; |
65 | } | |
66 | ||
67 | static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
68 | { | |
69 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
70 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
71 | int i, ret; | |
72 | unsigned long sec; | |
73 | unsigned char buf[6]; | |
74 | ||
af69a180 | 75 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
76 | ret = tx4939_rtc_cmd(rtcreg, |
77 | TX4939_RTCCTL_COMMAND_GETTIME | | |
78 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
79 | if (ret) { | |
af69a180 | 80 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
81 | return ret; |
82 | } | |
83 | __raw_writel(2, &rtcreg->adr); | |
84 | for (i = 2; i < 6; i++) | |
85 | buf[i] = __raw_readl(&rtcreg->dat); | |
af69a180 | 86 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
87 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
88 | rtc_time_to_tm(sec, tm); | |
89 | return rtc_valid_tm(tm); | |
90 | } | |
91 | ||
92 | static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
93 | { | |
94 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
95 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
96 | int i, ret; | |
97 | unsigned long sec; | |
98 | unsigned char buf[6]; | |
99 | ||
100 | if (alrm->time.tm_sec < 0 || | |
101 | alrm->time.tm_min < 0 || | |
102 | alrm->time.tm_hour < 0 || | |
103 | alrm->time.tm_mday < 0 || | |
104 | alrm->time.tm_mon < 0 || | |
105 | alrm->time.tm_year < 0) | |
106 | return -EINVAL; | |
107 | rtc_tm_to_time(&alrm->time, &sec); | |
108 | buf[0] = 0; | |
109 | buf[1] = 0; | |
110 | buf[2] = sec; | |
111 | buf[3] = sec >> 8; | |
112 | buf[4] = sec >> 16; | |
113 | buf[5] = sec >> 24; | |
af69a180 | 114 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
115 | __raw_writel(0, &rtcreg->adr); |
116 | for (i = 0; i < 6; i++) | |
117 | __raw_writel(buf[i], &rtcreg->dat); | |
118 | ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM | | |
119 | (alrm->enabled ? TX4939_RTCCTL_ALME : 0)); | |
af69a180 | 120 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
121 | return ret; |
122 | } | |
123 | ||
124 | static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
125 | { | |
126 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
127 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
128 | int i, ret; | |
129 | unsigned long sec; | |
130 | unsigned char buf[6]; | |
131 | u32 ctl; | |
132 | ||
af69a180 | 133 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
134 | ret = tx4939_rtc_cmd(rtcreg, |
135 | TX4939_RTCCTL_COMMAND_GETALARM | | |
136 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
137 | if (ret) { | |
af69a180 | 138 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
139 | return ret; |
140 | } | |
141 | __raw_writel(2, &rtcreg->adr); | |
142 | for (i = 2; i < 6; i++) | |
143 | buf[i] = __raw_readl(&rtcreg->dat); | |
144 | ctl = __raw_readl(&rtcreg->ctl); | |
145 | alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0; | |
146 | alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0; | |
af69a180 | 147 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
148 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
149 | rtc_time_to_tm(sec, &alrm->time); | |
150 | return rtc_valid_tm(&alrm->time); | |
151 | } | |
152 | ||
153 | static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
154 | { | |
155 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
156 | ||
af69a180 | 157 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
158 | tx4939_rtc_cmd(pdata->rtcreg, |
159 | TX4939_RTCCTL_COMMAND_NOP | | |
160 | (enabled ? TX4939_RTCCTL_ALME : 0)); | |
af69a180 | 161 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
162 | return 0; |
163 | } | |
164 | ||
165 | static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id) | |
166 | { | |
167 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id); | |
168 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
169 | unsigned long events = RTC_IRQF; | |
170 | ||
af69a180 | 171 | spin_lock(&pdata->lock); |
0e149233 AN |
172 | if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) { |
173 | events |= RTC_AF; | |
174 | tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP); | |
175 | } | |
af69a180 AN |
176 | spin_unlock(&pdata->lock); |
177 | if (likely(pdata->rtc)) | |
178 | rtc_update_irq(pdata->rtc, 1, events); | |
0e149233 AN |
179 | return IRQ_HANDLED; |
180 | } | |
181 | ||
182 | static const struct rtc_class_ops tx4939_rtc_ops = { | |
183 | .read_time = tx4939_rtc_read_time, | |
184 | .read_alarm = tx4939_rtc_read_alarm, | |
185 | .set_alarm = tx4939_rtc_set_alarm, | |
186 | .set_mmss = tx4939_rtc_set_mmss, | |
187 | .alarm_irq_enable = tx4939_rtc_alarm_irq_enable, | |
188 | }; | |
189 | ||
190 | static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj, | |
191 | struct bin_attribute *bin_attr, | |
192 | char *buf, loff_t pos, size_t size) | |
193 | { | |
194 | struct device *dev = container_of(kobj, struct device, kobj); | |
195 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
196 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
197 | ssize_t count; | |
198 | ||
af69a180 | 199 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
200 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
201 | count++, size--) { | |
202 | __raw_writel(pos++, &rtcreg->adr); | |
203 | *buf++ = __raw_readl(&rtcreg->dat); | |
204 | } | |
af69a180 | 205 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
206 | return count; |
207 | } | |
208 | ||
209 | static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj, | |
210 | struct bin_attribute *bin_attr, | |
211 | char *buf, loff_t pos, size_t size) | |
212 | { | |
213 | struct device *dev = container_of(kobj, struct device, kobj); | |
214 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
215 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
216 | ssize_t count; | |
217 | ||
af69a180 | 218 | spin_lock_irq(&pdata->lock); |
0e149233 AN |
219 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
220 | count++, size--) { | |
221 | __raw_writel(pos++, &rtcreg->adr); | |
222 | __raw_writel(*buf++, &rtcreg->dat); | |
223 | } | |
af69a180 | 224 | spin_unlock_irq(&pdata->lock); |
0e149233 AN |
225 | return count; |
226 | } | |
227 | ||
228 | static struct bin_attribute tx4939_rtc_nvram_attr = { | |
229 | .attr = { | |
230 | .name = "nvram", | |
231 | .mode = S_IRUGO | S_IWUSR, | |
232 | }, | |
233 | .size = TX4939_RTC_REG_RAMSIZE, | |
234 | .read = tx4939_rtc_nvram_read, | |
235 | .write = tx4939_rtc_nvram_write, | |
236 | }; | |
237 | ||
238 | static int __init tx4939_rtc_probe(struct platform_device *pdev) | |
239 | { | |
240 | struct rtc_device *rtc; | |
241 | struct tx4939rtc_plat_data *pdata; | |
242 | struct resource *res; | |
243 | int irq, ret; | |
244 | ||
245 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
246 | if (!res) | |
247 | return -ENODEV; | |
248 | irq = platform_get_irq(pdev, 0); | |
249 | if (irq < 0) | |
250 | return -ENODEV; | |
251 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
252 | if (!pdata) | |
253 | return -ENOMEM; | |
254 | platform_set_drvdata(pdev, pdata); | |
255 | ||
256 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
257 | resource_size(res), pdev->name)) | |
258 | return -EBUSY; | |
259 | pdata->rtcreg = devm_ioremap(&pdev->dev, res->start, | |
260 | resource_size(res)); | |
261 | if (!pdata->rtcreg) | |
262 | return -EBUSY; | |
263 | ||
af69a180 | 264 | spin_lock_init(&pdata->lock); |
0e149233 AN |
265 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
266 | if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt, | |
0a817f7f | 267 | IRQF_DISABLED, pdev->name, &pdev->dev) < 0) |
0e149233 | 268 | return -EBUSY; |
0e149233 AN |
269 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
270 | &tx4939_rtc_ops, THIS_MODULE); | |
271 | if (IS_ERR(rtc)) | |
272 | return PTR_ERR(rtc); | |
273 | pdata->rtc = rtc; | |
274 | ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); | |
275 | if (ret) | |
276 | rtc_device_unregister(rtc); | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static int __exit tx4939_rtc_remove(struct platform_device *pdev) | |
281 | { | |
282 | struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev); | |
0e149233 | 283 | |
0e149233 | 284 | sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); |
af69a180 AN |
285 | rtc_device_unregister(pdata->rtc); |
286 | spin_lock_irq(&pdata->lock); | |
287 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); | |
288 | spin_unlock_irq(&pdata->lock); | |
0e149233 AN |
289 | return 0; |
290 | } | |
291 | ||
292 | static struct platform_driver tx4939_rtc_driver = { | |
293 | .remove = __exit_p(tx4939_rtc_remove), | |
294 | .driver = { | |
295 | .name = "tx4939rtc", | |
296 | .owner = THIS_MODULE, | |
297 | }, | |
298 | }; | |
299 | ||
300 | static int __init tx4939rtc_init(void) | |
301 | { | |
302 | return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe); | |
303 | } | |
304 | ||
305 | static void __exit tx4939rtc_exit(void) | |
306 | { | |
307 | platform_driver_unregister(&tx4939_rtc_driver); | |
308 | } | |
309 | ||
310 | module_init(tx4939rtc_init); | |
311 | module_exit(tx4939rtc_exit); | |
312 | ||
313 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); | |
314 | MODULE_DESCRIPTION("TX4939 internal RTC driver"); | |
315 | MODULE_LICENSE("GPL"); | |
316 | MODULE_ALIAS("platform:tx4939rtc"); |