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