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| 1 | /* |
| 2 | * linux/drivers/rtc/rtc-pl030.c |
| 3 | * |
| 4 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/rtc.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/amba/bus.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/slab.h> |
| 17 | |
| 18 | #define RTC_DR (0) |
| 19 | #define RTC_MR (4) |
| 20 | #define RTC_STAT (8) |
| 21 | #define RTC_EOI (8) |
| 22 | #define RTC_LR (12) |
| 23 | #define RTC_CR (16) |
| 24 | #define RTC_CR_MIE (1 << 0) |
| 25 | |
| 26 | struct pl030_rtc { |
| 27 | struct rtc_device *rtc; |
| 28 | void __iomem *base; |
| 29 | }; |
| 30 | |
| 31 | static irqreturn_t pl030_interrupt(int irq, void *dev_id) |
| 32 | { |
| 33 | struct pl030_rtc *rtc = dev_id; |
| 34 | writel(0, rtc->base + RTC_EOI); |
| 35 | return IRQ_HANDLED; |
| 36 | } |
| 37 | |
| 38 | static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 39 | { |
| 40 | struct pl030_rtc *rtc = dev_get_drvdata(dev); |
| 41 | |
| 42 | rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time); |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 47 | { |
| 48 | struct pl030_rtc *rtc = dev_get_drvdata(dev); |
| 49 | unsigned long time; |
| 50 | int ret; |
| 51 | |
| 52 | /* |
| 53 | * At the moment, we can only deal with non-wildcarded alarm times. |
| 54 | */ |
| 55 | ret = rtc_valid_tm(&alrm->time); |
| 56 | if (ret == 0) |
| 57 | ret = rtc_tm_to_time(&alrm->time, &time); |
| 58 | if (ret == 0) |
| 59 | writel(time, rtc->base + RTC_MR); |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | static int pl030_read_time(struct device *dev, struct rtc_time *tm) |
| 64 | { |
| 65 | struct pl030_rtc *rtc = dev_get_drvdata(dev); |
| 66 | |
| 67 | rtc_time_to_tm(readl(rtc->base + RTC_DR), tm); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Set the RTC time. Unfortunately, we can't accurately set |
| 74 | * the point at which the counter updates. |
| 75 | * |
| 76 | * Also, since RTC_LR is transferred to RTC_CR on next rising |
| 77 | * edge of the 1Hz clock, we must write the time one second |
| 78 | * in advance. |
| 79 | */ |
| 80 | static int pl030_set_time(struct device *dev, struct rtc_time *tm) |
| 81 | { |
| 82 | struct pl030_rtc *rtc = dev_get_drvdata(dev); |
| 83 | unsigned long time; |
| 84 | int ret; |
| 85 | |
| 86 | ret = rtc_tm_to_time(tm, &time); |
| 87 | if (ret == 0) |
| 88 | writel(time + 1, rtc->base + RTC_LR); |
| 89 | |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | static const struct rtc_class_ops pl030_ops = { |
| 94 | .read_time = pl030_read_time, |
| 95 | .set_time = pl030_set_time, |
| 96 | .read_alarm = pl030_read_alarm, |
| 97 | .set_alarm = pl030_set_alarm, |
| 98 | }; |
| 99 | |
| 100 | static int pl030_probe(struct amba_device *dev, const struct amba_id *id) |
| 101 | { |
| 102 | struct pl030_rtc *rtc; |
| 103 | int ret; |
| 104 | |
| 105 | ret = amba_request_regions(dev, NULL); |
| 106 | if (ret) |
| 107 | goto err_req; |
| 108 | |
| 109 | rtc = kmalloc(sizeof(*rtc), GFP_KERNEL); |
| 110 | if (!rtc) { |
| 111 | ret = -ENOMEM; |
| 112 | goto err_rtc; |
| 113 | } |
| 114 | |
| 115 | rtc->base = ioremap(dev->res.start, resource_size(&dev->res)); |
| 116 | if (!rtc->base) { |
| 117 | ret = -ENOMEM; |
| 118 | goto err_map; |
| 119 | } |
| 120 | |
| 121 | __raw_writel(0, rtc->base + RTC_CR); |
| 122 | __raw_writel(0, rtc->base + RTC_EOI); |
| 123 | |
| 124 | amba_set_drvdata(dev, rtc); |
| 125 | |
| 126 | ret = request_irq(dev->irq[0], pl030_interrupt, 0, |
| 127 | "rtc-pl030", rtc); |
| 128 | if (ret) |
| 129 | goto err_irq; |
| 130 | |
| 131 | rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops, |
| 132 | THIS_MODULE); |
| 133 | if (IS_ERR(rtc->rtc)) { |
| 134 | ret = PTR_ERR(rtc->rtc); |
| 135 | goto err_reg; |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | |
| 140 | err_reg: |
| 141 | free_irq(dev->irq[0], rtc); |
| 142 | err_irq: |
| 143 | iounmap(rtc->base); |
| 144 | err_map: |
| 145 | kfree(rtc); |
| 146 | err_rtc: |
| 147 | amba_release_regions(dev); |
| 148 | err_req: |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | static int pl030_remove(struct amba_device *dev) |
| 153 | { |
| 154 | struct pl030_rtc *rtc = amba_get_drvdata(dev); |
| 155 | |
| 156 | amba_set_drvdata(dev, NULL); |
| 157 | |
| 158 | writel(0, rtc->base + RTC_CR); |
| 159 | |
| 160 | free_irq(dev->irq[0], rtc); |
| 161 | rtc_device_unregister(rtc->rtc); |
| 162 | iounmap(rtc->base); |
| 163 | kfree(rtc); |
| 164 | amba_release_regions(dev); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static struct amba_id pl030_ids[] = { |
| 170 | { |
| 171 | .id = 0x00041030, |
| 172 | .mask = 0x000fffff, |
| 173 | }, |
| 174 | { 0, 0 }, |
| 175 | }; |
| 176 | |
| 177 | MODULE_DEVICE_TABLE(amba, pl030_ids); |
| 178 | |
| 179 | static struct amba_driver pl030_driver = { |
| 180 | .drv = { |
| 181 | .name = "rtc-pl030", |
| 182 | }, |
| 183 | .probe = pl030_probe, |
| 184 | .remove = pl030_remove, |
| 185 | .id_table = pl030_ids, |
| 186 | }; |
| 187 | |
| 188 | module_amba_driver(pl030_driver); |
| 189 | |
| 190 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); |
| 191 | MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver"); |
| 192 | MODULE_LICENSE("GPL"); |
| 193 |
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