Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 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> |
Paul Gortmaker | 2113852 | 2011-05-27 09:57:25 -0400 | [diff] [blame] | 14 | #include <linux/module.h> |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 15 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/gfp.h> |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 17 | #include <asm/txx9/tx4939.h> |
| 18 | |
| 19 | struct tx4939rtc_plat_data { |
| 20 | struct rtc_device *rtc; |
| 21 | struct tx4939_rtc_reg __iomem *rtcreg; |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 22 | spinlock_t lock; |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 23 | }; |
| 24 | |
| 25 | static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev) |
| 26 | { |
| 27 | return platform_get_drvdata(to_platform_device(dev)); |
| 28 | } |
| 29 | |
| 30 | static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd) |
| 31 | { |
| 32 | int i = 0; |
| 33 | |
| 34 | __raw_writel(cmd, &rtcreg->ctl); |
| 35 | /* This might take 30us (next 32.768KHz clock) */ |
| 36 | while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) { |
| 37 | /* timeout on approx. 100us (@ GBUS200MHz) */ |
| 38 | if (i++ > 200 * 100) |
| 39 | return -EBUSY; |
| 40 | cpu_relax(); |
| 41 | } |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs) |
| 46 | { |
| 47 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 48 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 49 | int i, ret; |
| 50 | unsigned char buf[6]; |
| 51 | |
| 52 | buf[0] = 0; |
| 53 | buf[1] = 0; |
| 54 | buf[2] = secs; |
| 55 | buf[3] = secs >> 8; |
| 56 | buf[4] = secs >> 16; |
| 57 | buf[5] = secs >> 24; |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 58 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 59 | __raw_writel(0, &rtcreg->adr); |
| 60 | for (i = 0; i < 6; i++) |
| 61 | __raw_writel(buf[i], &rtcreg->dat); |
| 62 | ret = tx4939_rtc_cmd(rtcreg, |
| 63 | TX4939_RTCCTL_COMMAND_SETTIME | |
| 64 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 65 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 70 | { |
| 71 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 72 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 73 | int i, ret; |
| 74 | unsigned long sec; |
| 75 | unsigned char buf[6]; |
| 76 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 77 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 78 | ret = tx4939_rtc_cmd(rtcreg, |
| 79 | TX4939_RTCCTL_COMMAND_GETTIME | |
| 80 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
| 81 | if (ret) { |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 82 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 83 | return ret; |
| 84 | } |
| 85 | __raw_writel(2, &rtcreg->adr); |
| 86 | for (i = 2; i < 6; i++) |
| 87 | buf[i] = __raw_readl(&rtcreg->dat); |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 88 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 89 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
| 90 | rtc_time_to_tm(sec, tm); |
| 91 | return rtc_valid_tm(tm); |
| 92 | } |
| 93 | |
| 94 | static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 95 | { |
| 96 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 97 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 98 | int i, ret; |
| 99 | unsigned long sec; |
| 100 | unsigned char buf[6]; |
| 101 | |
| 102 | if (alrm->time.tm_sec < 0 || |
| 103 | alrm->time.tm_min < 0 || |
| 104 | alrm->time.tm_hour < 0 || |
| 105 | alrm->time.tm_mday < 0 || |
| 106 | alrm->time.tm_mon < 0 || |
| 107 | alrm->time.tm_year < 0) |
| 108 | return -EINVAL; |
| 109 | rtc_tm_to_time(&alrm->time, &sec); |
| 110 | buf[0] = 0; |
| 111 | buf[1] = 0; |
| 112 | buf[2] = sec; |
| 113 | buf[3] = sec >> 8; |
| 114 | buf[4] = sec >> 16; |
| 115 | buf[5] = sec >> 24; |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 116 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 117 | __raw_writel(0, &rtcreg->adr); |
| 118 | for (i = 0; i < 6; i++) |
| 119 | __raw_writel(buf[i], &rtcreg->dat); |
| 120 | ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM | |
| 121 | (alrm->enabled ? TX4939_RTCCTL_ALME : 0)); |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 122 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 127 | { |
| 128 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 129 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 130 | int i, ret; |
| 131 | unsigned long sec; |
| 132 | unsigned char buf[6]; |
| 133 | u32 ctl; |
| 134 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 135 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 136 | ret = tx4939_rtc_cmd(rtcreg, |
| 137 | TX4939_RTCCTL_COMMAND_GETALARM | |
| 138 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); |
| 139 | if (ret) { |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 140 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 141 | return ret; |
| 142 | } |
| 143 | __raw_writel(2, &rtcreg->adr); |
| 144 | for (i = 2; i < 6; i++) |
| 145 | buf[i] = __raw_readl(&rtcreg->dat); |
| 146 | ctl = __raw_readl(&rtcreg->ctl); |
| 147 | alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0; |
| 148 | alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0; |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 149 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 150 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; |
| 151 | rtc_time_to_tm(sec, &alrm->time); |
| 152 | return rtc_valid_tm(&alrm->time); |
| 153 | } |
| 154 | |
| 155 | static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
| 156 | { |
| 157 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 158 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 159 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 160 | tx4939_rtc_cmd(pdata->rtcreg, |
| 161 | TX4939_RTCCTL_COMMAND_NOP | |
| 162 | (enabled ? TX4939_RTCCTL_ALME : 0)); |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 163 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id) |
| 168 | { |
| 169 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id); |
| 170 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 171 | unsigned long events = RTC_IRQF; |
| 172 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 173 | spin_lock(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 174 | if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) { |
| 175 | events |= RTC_AF; |
| 176 | tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
| 177 | } |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 178 | spin_unlock(&pdata->lock); |
| 179 | if (likely(pdata->rtc)) |
| 180 | rtc_update_irq(pdata->rtc, 1, events); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 181 | return IRQ_HANDLED; |
| 182 | } |
| 183 | |
| 184 | static const struct rtc_class_ops tx4939_rtc_ops = { |
| 185 | .read_time = tx4939_rtc_read_time, |
| 186 | .read_alarm = tx4939_rtc_read_alarm, |
| 187 | .set_alarm = tx4939_rtc_set_alarm, |
| 188 | .set_mmss = tx4939_rtc_set_mmss, |
| 189 | .alarm_irq_enable = tx4939_rtc_alarm_irq_enable, |
| 190 | }; |
| 191 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 192 | static ssize_t tx4939_rtc_nvram_read(struct file *filp, struct kobject *kobj, |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 193 | struct bin_attribute *bin_attr, |
| 194 | char *buf, loff_t pos, size_t size) |
| 195 | { |
| 196 | struct device *dev = container_of(kobj, struct device, kobj); |
| 197 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 198 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 199 | ssize_t count; |
| 200 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 201 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 202 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
| 203 | count++, size--) { |
| 204 | __raw_writel(pos++, &rtcreg->adr); |
| 205 | *buf++ = __raw_readl(&rtcreg->dat); |
| 206 | } |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 207 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 208 | return count; |
| 209 | } |
| 210 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 211 | static ssize_t tx4939_rtc_nvram_write(struct file *filp, struct kobject *kobj, |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 212 | struct bin_attribute *bin_attr, |
| 213 | char *buf, loff_t pos, size_t size) |
| 214 | { |
| 215 | struct device *dev = container_of(kobj, struct device, kobj); |
| 216 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); |
| 217 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; |
| 218 | ssize_t count; |
| 219 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 220 | spin_lock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 221 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; |
| 222 | count++, size--) { |
| 223 | __raw_writel(pos++, &rtcreg->adr); |
| 224 | __raw_writel(*buf++, &rtcreg->dat); |
| 225 | } |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 226 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 227 | return count; |
| 228 | } |
| 229 | |
| 230 | static struct bin_attribute tx4939_rtc_nvram_attr = { |
| 231 | .attr = { |
| 232 | .name = "nvram", |
| 233 | .mode = S_IRUGO | S_IWUSR, |
| 234 | }, |
| 235 | .size = TX4939_RTC_REG_RAMSIZE, |
| 236 | .read = tx4939_rtc_nvram_read, |
| 237 | .write = tx4939_rtc_nvram_write, |
| 238 | }; |
| 239 | |
| 240 | static int __init tx4939_rtc_probe(struct platform_device *pdev) |
| 241 | { |
| 242 | struct rtc_device *rtc; |
| 243 | struct tx4939rtc_plat_data *pdata; |
| 244 | struct resource *res; |
| 245 | int irq, ret; |
| 246 | |
| 247 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 248 | if (!res) |
| 249 | return -ENODEV; |
| 250 | irq = platform_get_irq(pdev, 0); |
| 251 | if (irq < 0) |
| 252 | return -ENODEV; |
| 253 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| 254 | if (!pdata) |
| 255 | return -ENOMEM; |
| 256 | platform_set_drvdata(pdev, pdata); |
| 257 | |
| 258 | if (!devm_request_mem_region(&pdev->dev, res->start, |
| 259 | resource_size(res), pdev->name)) |
| 260 | return -EBUSY; |
| 261 | pdata->rtcreg = devm_ioremap(&pdev->dev, res->start, |
| 262 | resource_size(res)); |
| 263 | if (!pdata->rtcreg) |
| 264 | return -EBUSY; |
| 265 | |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 266 | spin_lock_init(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 267 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
| 268 | if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt, |
Atsushi Nemoto | 0a817f7 | 2009-06-17 16:26:12 -0700 | [diff] [blame] | 269 | IRQF_DISABLED, pdev->name, &pdev->dev) < 0) |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 270 | return -EBUSY; |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 271 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
| 272 | &tx4939_rtc_ops, THIS_MODULE); |
| 273 | if (IS_ERR(rtc)) |
| 274 | return PTR_ERR(rtc); |
| 275 | pdata->rtc = rtc; |
| 276 | ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); |
| 277 | if (ret) |
| 278 | rtc_device_unregister(rtc); |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | static int __exit tx4939_rtc_remove(struct platform_device *pdev) |
| 283 | { |
| 284 | struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 285 | |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 286 | sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); |
Atsushi Nemoto | af69a18 | 2009-12-15 16:46:00 -0800 | [diff] [blame] | 287 | rtc_device_unregister(pdata->rtc); |
| 288 | spin_lock_irq(&pdata->lock); |
| 289 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); |
| 290 | spin_unlock_irq(&pdata->lock); |
Atsushi Nemoto | 0e14923 | 2009-01-06 14:42:22 -0800 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | static struct platform_driver tx4939_rtc_driver = { |
| 295 | .remove = __exit_p(tx4939_rtc_remove), |
| 296 | .driver = { |
| 297 | .name = "tx4939rtc", |
| 298 | .owner = THIS_MODULE, |
| 299 | }, |
| 300 | }; |
| 301 | |
| 302 | static int __init tx4939rtc_init(void) |
| 303 | { |
| 304 | return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe); |
| 305 | } |
| 306 | |
| 307 | static void __exit tx4939rtc_exit(void) |
| 308 | { |
| 309 | platform_driver_unregister(&tx4939_rtc_driver); |
| 310 | } |
| 311 | |
| 312 | module_init(tx4939rtc_init); |
| 313 | module_exit(tx4939rtc_exit); |
| 314 | |
| 315 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); |
| 316 | MODULE_DESCRIPTION("TX4939 internal RTC driver"); |
| 317 | MODULE_LICENSE("GPL"); |
| 318 | MODULE_ALIAS("platform:tx4939rtc"); |