Loading...
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
18struct tx4939rtc_plat_data {
19 struct rtc_device *rtc;
20 struct tx4939_rtc_reg __iomem *rtcreg;
21 spinlock_t lock;
22};
23
24static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev)
25{
26 return platform_get_drvdata(to_platform_device(dev));
27}
28
29static 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
44static 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
68static 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
93static 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
125static 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
154static 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
166static 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
183static 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
191static ssize_t tx4939_rtc_nvram_read(struct file *filp, 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
210static ssize_t tx4939_rtc_nvram_write(struct file *filp, 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
229static 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
239static 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
281static 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
293static 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
301static int __init tx4939rtc_init(void)
302{
303 return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe);
304}
305
306static void __exit tx4939rtc_exit(void)
307{
308 platform_driver_unregister(&tx4939_rtc_driver);
309}
310
311module_init(tx4939rtc_init);
312module_exit(tx4939rtc_exit);
313
314MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
315MODULE_DESCRIPTION("TX4939 internal RTC driver");
316MODULE_LICENSE("GPL");
317MODULE_ALIAS("platform:tx4939rtc");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * TX4939 internal RTC driver
4 * Based on RBTX49xx patch from CELF patch archive.
5 *
6 * (C) Copyright TOSHIBA CORPORATION 2005-2007
7 */
8#include <linux/rtc.h>
9#include <linux/platform_device.h>
10#include <linux/interrupt.h>
11#include <linux/module.h>
12#include <linux/io.h>
13#include <linux/gfp.h>
14
15#define TX4939_RTCCTL_ALME 0x00000080
16#define TX4939_RTCCTL_ALMD 0x00000040
17#define TX4939_RTCCTL_BUSY 0x00000020
18
19#define TX4939_RTCCTL_COMMAND 0x00000007
20#define TX4939_RTCCTL_COMMAND_NOP 0x00000000
21#define TX4939_RTCCTL_COMMAND_GETTIME 0x00000001
22#define TX4939_RTCCTL_COMMAND_SETTIME 0x00000002
23#define TX4939_RTCCTL_COMMAND_GETALARM 0x00000003
24#define TX4939_RTCCTL_COMMAND_SETALARM 0x00000004
25
26#define TX4939_RTCTBC_PM 0x00000080
27#define TX4939_RTCTBC_COMP 0x0000007f
28
29#define TX4939_RTC_REG_RAMSIZE 0x00000100
30#define TX4939_RTC_REG_RWBSIZE 0x00000006
31
32struct tx4939_rtc_reg {
33 __u32 ctl;
34 __u32 adr;
35 __u32 dat;
36 __u32 tbc;
37};
38
39struct tx4939rtc_plat_data {
40 struct rtc_device *rtc;
41 struct tx4939_rtc_reg __iomem *rtcreg;
42 spinlock_t lock;
43};
44
45static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
46{
47 int i = 0;
48
49 __raw_writel(cmd, &rtcreg->ctl);
50 /* This might take 30us (next 32.768KHz clock) */
51 while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
52 /* timeout on approx. 100us (@ GBUS200MHz) */
53 if (i++ > 200 * 100)
54 return -EBUSY;
55 cpu_relax();
56 }
57 return 0;
58}
59
60static int tx4939_rtc_set_time(struct device *dev, struct rtc_time *tm)
61{
62 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
63 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
64 unsigned long secs = rtc_tm_to_time64(tm);
65 int i, ret;
66 unsigned char buf[6];
67
68 buf[0] = 0;
69 buf[1] = 0;
70 buf[2] = secs;
71 buf[3] = secs >> 8;
72 buf[4] = secs >> 16;
73 buf[5] = secs >> 24;
74 spin_lock_irq(&pdata->lock);
75 __raw_writel(0, &rtcreg->adr);
76 for (i = 0; i < 6; i++)
77 __raw_writel(buf[i], &rtcreg->dat);
78 ret = tx4939_rtc_cmd(rtcreg,
79 TX4939_RTCCTL_COMMAND_SETTIME |
80 (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
81 spin_unlock_irq(&pdata->lock);
82 return ret;
83}
84
85static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
86{
87 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
88 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
89 int i, ret;
90 unsigned long sec;
91 unsigned char buf[6];
92
93 spin_lock_irq(&pdata->lock);
94 ret = tx4939_rtc_cmd(rtcreg,
95 TX4939_RTCCTL_COMMAND_GETTIME |
96 (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
97 if (ret) {
98 spin_unlock_irq(&pdata->lock);
99 return ret;
100 }
101 __raw_writel(2, &rtcreg->adr);
102 for (i = 2; i < 6; i++)
103 buf[i] = __raw_readl(&rtcreg->dat);
104 spin_unlock_irq(&pdata->lock);
105 sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
106 (buf[3] << 8) | buf[2];
107 rtc_time64_to_tm(sec, tm);
108 return 0;
109}
110
111static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
112{
113 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
114 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
115 int i, ret;
116 unsigned long sec;
117 unsigned char buf[6];
118
119 sec = rtc_tm_to_time64(&alrm->time);
120 buf[0] = 0;
121 buf[1] = 0;
122 buf[2] = sec;
123 buf[3] = sec >> 8;
124 buf[4] = sec >> 16;
125 buf[5] = sec >> 24;
126 spin_lock_irq(&pdata->lock);
127 __raw_writel(0, &rtcreg->adr);
128 for (i = 0; i < 6; i++)
129 __raw_writel(buf[i], &rtcreg->dat);
130 ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM |
131 (alrm->enabled ? TX4939_RTCCTL_ALME : 0));
132 spin_unlock_irq(&pdata->lock);
133 return ret;
134}
135
136static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
137{
138 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
139 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
140 int i, ret;
141 unsigned long sec;
142 unsigned char buf[6];
143 u32 ctl;
144
145 spin_lock_irq(&pdata->lock);
146 ret = tx4939_rtc_cmd(rtcreg,
147 TX4939_RTCCTL_COMMAND_GETALARM |
148 (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
149 if (ret) {
150 spin_unlock_irq(&pdata->lock);
151 return ret;
152 }
153 __raw_writel(2, &rtcreg->adr);
154 for (i = 2; i < 6; i++)
155 buf[i] = __raw_readl(&rtcreg->dat);
156 ctl = __raw_readl(&rtcreg->ctl);
157 alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
158 alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
159 spin_unlock_irq(&pdata->lock);
160 sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
161 (buf[3] << 8) | buf[2];
162 rtc_time64_to_tm(sec, &alrm->time);
163 return rtc_valid_tm(&alrm->time);
164}
165
166static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
167{
168 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
169
170 spin_lock_irq(&pdata->lock);
171 tx4939_rtc_cmd(pdata->rtcreg,
172 TX4939_RTCCTL_COMMAND_NOP |
173 (enabled ? TX4939_RTCCTL_ALME : 0));
174 spin_unlock_irq(&pdata->lock);
175 return 0;
176}
177
178static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
179{
180 struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev_id);
181 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
182 unsigned long events = RTC_IRQF;
183
184 spin_lock(&pdata->lock);
185 if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
186 events |= RTC_AF;
187 tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
188 }
189 spin_unlock(&pdata->lock);
190 rtc_update_irq(pdata->rtc, 1, events);
191
192 return IRQ_HANDLED;
193}
194
195static const struct rtc_class_ops tx4939_rtc_ops = {
196 .read_time = tx4939_rtc_read_time,
197 .read_alarm = tx4939_rtc_read_alarm,
198 .set_alarm = tx4939_rtc_set_alarm,
199 .set_time = tx4939_rtc_set_time,
200 .alarm_irq_enable = tx4939_rtc_alarm_irq_enable,
201};
202
203static int tx4939_nvram_read(void *priv, unsigned int pos, void *val,
204 size_t bytes)
205{
206 struct tx4939rtc_plat_data *pdata = priv;
207 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
208 u8 *buf = val;
209
210 spin_lock_irq(&pdata->lock);
211 for (; bytes; bytes--) {
212 __raw_writel(pos++, &rtcreg->adr);
213 *buf++ = __raw_readl(&rtcreg->dat);
214 }
215 spin_unlock_irq(&pdata->lock);
216 return 0;
217}
218
219static int tx4939_nvram_write(void *priv, unsigned int pos, void *val,
220 size_t bytes)
221{
222 struct tx4939rtc_plat_data *pdata = priv;
223 struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
224 u8 *buf = val;
225
226 spin_lock_irq(&pdata->lock);
227 for (; bytes; bytes--) {
228 __raw_writel(pos++, &rtcreg->adr);
229 __raw_writel(*buf++, &rtcreg->dat);
230 }
231 spin_unlock_irq(&pdata->lock);
232 return 0;
233}
234
235static int __init tx4939_rtc_probe(struct platform_device *pdev)
236{
237 struct rtc_device *rtc;
238 struct tx4939rtc_plat_data *pdata;
239 int irq, ret;
240 struct nvmem_config nvmem_cfg = {
241 .name = "tx4939_nvram",
242 .size = TX4939_RTC_REG_RAMSIZE,
243 .reg_read = tx4939_nvram_read,
244 .reg_write = tx4939_nvram_write,
245 };
246
247 irq = platform_get_irq(pdev, 0);
248 if (irq < 0)
249 return -ENODEV;
250 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
251 if (!pdata)
252 return -ENOMEM;
253 platform_set_drvdata(pdev, pdata);
254
255 pdata->rtcreg = devm_platform_ioremap_resource(pdev, 0);
256 if (IS_ERR(pdata->rtcreg))
257 return PTR_ERR(pdata->rtcreg);
258
259 spin_lock_init(&pdata->lock);
260 tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
261 if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt,
262 0, pdev->name, &pdev->dev) < 0)
263 return -EBUSY;
264 rtc = devm_rtc_allocate_device(&pdev->dev);
265 if (IS_ERR(rtc))
266 return PTR_ERR(rtc);
267
268 rtc->ops = &tx4939_rtc_ops;
269 rtc->nvram_old_abi = true;
270 rtc->range_max = U32_MAX;
271
272 pdata->rtc = rtc;
273
274 nvmem_cfg.priv = pdata;
275 ret = rtc_nvmem_register(rtc, &nvmem_cfg);
276 if (ret)
277 return ret;
278
279 return rtc_register_device(rtc);
280}
281
282static int __exit tx4939_rtc_remove(struct platform_device *pdev)
283{
284 struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev);
285
286 spin_lock_irq(&pdata->lock);
287 tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
288 spin_unlock_irq(&pdata->lock);
289 return 0;
290}
291
292static struct platform_driver tx4939_rtc_driver = {
293 .remove = __exit_p(tx4939_rtc_remove),
294 .driver = {
295 .name = "tx4939rtc",
296 },
297};
298
299module_platform_driver_probe(tx4939_rtc_driver, tx4939_rtc_probe);
300
301MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
302MODULE_DESCRIPTION("TX4939 internal RTC driver");
303MODULE_LICENSE("GPL v2");
304MODULE_ALIAS("platform:tx4939rtc");