diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1685.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1685.c | 116 |
1 files changed, 60 insertions, 56 deletions
diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c index 184e4a3e2bef..56c670af2e50 100644 --- a/drivers/rtc/rtc-ds1685.c +++ b/drivers/rtc/rtc-ds1685.c @@ -31,7 +31,10 @@ /* ----------------------------------------------------------------------- */ -/* Standard read/write functions if platform does not provide overrides */ +/* + * Standard read/write + * all registers are mapped in CPU address space + */ /** * ds1685_read - read a value from an rtc register. @@ -59,6 +62,35 @@ ds1685_write(struct ds1685_priv *rtc, int reg, u8 value) } /* ----------------------------------------------------------------------- */ +/* + * Indirect read/write functions + * access happens via address and data register mapped in CPU address space + */ + +/** + * ds1685_indirect_read - read a value from an rtc register. + * @rtc: pointer to the ds1685 rtc structure. + * @reg: the register address to read. + */ +static u8 +ds1685_indirect_read(struct ds1685_priv *rtc, int reg) +{ + writeb(reg, rtc->regs); + return readb(rtc->data); +} + +/** + * ds1685_indirect_write - write a value to an rtc register. + * @rtc: pointer to the ds1685 rtc structure. + * @reg: the register address to write. + * @value: value to write to the register. + */ +static void +ds1685_indirect_write(struct ds1685_priv *rtc, int reg, u8 value) +{ + writeb(reg, rtc->regs); + writeb(value, rtc->data); +} /* ----------------------------------------------------------------------- */ /* Inlined functions */ @@ -229,7 +261,7 @@ static int ds1685_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct ds1685_priv *rtc = dev_get_drvdata(dev); - u8 ctrlb, century; + u8 century; u8 seconds, minutes, hours, wday, mday, month, years; /* Fetch the time info from the RTC registers. */ @@ -242,7 +274,6 @@ ds1685_rtc_read_time(struct device *dev, struct rtc_time *tm) month = rtc->read(rtc, RTC_MONTH); years = rtc->read(rtc, RTC_YEAR); century = rtc->read(rtc, RTC_CENTURY); - ctrlb = rtc->read(rtc, RTC_CTRL_B); ds1685_rtc_end_data_access(rtc); /* bcd2bin if needed, perform fixups, and store to rtc_time. */ @@ -723,7 +754,7 @@ static int ds1685_rtc_proc(struct device *dev, struct seq_file *seq) { struct ds1685_priv *rtc = dev_get_drvdata(dev); - u8 ctrla, ctrlb, ctrlc, ctrld, ctrl4a, ctrl4b, ssn[8]; + u8 ctrla, ctrlb, ctrld, ctrl4a, ctrl4b, ssn[8]; char *model; /* Read all the relevant data from the control registers. */ @@ -731,7 +762,6 @@ ds1685_rtc_proc(struct device *dev, struct seq_file *seq) ds1685_rtc_get_ssn(rtc, ssn); ctrla = rtc->read(rtc, RTC_CTRL_A); ctrlb = rtc->read(rtc, RTC_CTRL_B); - ctrlc = rtc->read(rtc, RTC_CTRL_C); ctrld = rtc->read(rtc, RTC_CTRL_D); ctrl4a = rtc->read(rtc, RTC_EXT_CTRL_4A); ctrl4b = rtc->read(rtc, RTC_EXT_CTRL_4B); @@ -1009,7 +1039,7 @@ ds1685_rtc_sysfs_serial_show(struct device *dev, } static DEVICE_ATTR(serial, S_IRUGO, ds1685_rtc_sysfs_serial_show, NULL); -/** +/* * struct ds1685_rtc_sysfs_misc_attrs - list for misc RTC features. */ static struct attribute* @@ -1020,7 +1050,7 @@ ds1685_rtc_sysfs_misc_attrs[] = { NULL, }; -/** +/* * struct ds1685_rtc_sysfs_misc_grp - attr group for misc RTC features. */ static const struct attribute_group @@ -1040,7 +1070,6 @@ static int ds1685_rtc_probe(struct platform_device *pdev) { struct rtc_device *rtc_dev; - struct resource *res; struct ds1685_priv *rtc; struct ds1685_rtc_platform_data *pdata; u8 ctrla, ctrlb, hours; @@ -1063,35 +1092,29 @@ ds1685_rtc_probe(struct platform_device *pdev) if (!rtc) return -ENOMEM; - /* - * Allocate/setup any IORESOURCE_MEM resources, if required. Not all - * platforms put the RTC in an easy-access place. Like the SGI Octane, - * which attaches the RTC to a "ByteBus", hooked to a SuperIO chip - * that sits behind the IOC3 PCI metadevice. - */ - if (pdata->alloc_io_resources) { - /* Get the platform resources. */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENXIO; - rtc->size = resource_size(res); - - /* Request a memory region. */ - /* XXX: mmio-only for now. */ - if (!devm_request_mem_region(&pdev->dev, res->start, rtc->size, - pdev->name)) - return -EBUSY; - - /* - * Set the base address for the rtc, and ioremap its - * registers. - */ - rtc->baseaddr = res->start; - rtc->regs = devm_ioremap(&pdev->dev, res->start, rtc->size); - if (!rtc->regs) - return -ENOMEM; + /* Setup resources and access functions */ + switch (pdata->access_type) { + case ds1685_reg_direct: + rtc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc->regs)) + return PTR_ERR(rtc->regs); + rtc->read = ds1685_read; + rtc->write = ds1685_write; + break; + case ds1685_reg_indirect: + rtc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc->regs)) + return PTR_ERR(rtc->regs); + rtc->data = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(rtc->data)) + return PTR_ERR(rtc->data); + rtc->read = ds1685_indirect_read; + rtc->write = ds1685_indirect_write; + break; } - rtc->alloc_io_resources = pdata->alloc_io_resources; + + if (!rtc->read || !rtc->write) + return -ENXIO; /* Get the register step size. */ if (pdata->regstep > 0) @@ -1099,24 +1122,6 @@ ds1685_rtc_probe(struct platform_device *pdev) else rtc->regstep = 1; - /* Platform read function, else default if mmio setup */ - if (pdata->plat_read) - rtc->read = pdata->plat_read; - else - if (pdata->alloc_io_resources) - rtc->read = ds1685_read; - else - return -ENXIO; - - /* Platform write function, else default if mmio setup */ - if (pdata->plat_write) - rtc->write = pdata->plat_write; - else - if (pdata->alloc_io_resources) - rtc->write = ds1685_write; - else - return -ENXIO; - /* Platform pre-shutdown function, if defined. */ if (pdata->plat_prepare_poweroff) rtc->prepare_poweroff = pdata->plat_prepare_poweroff; @@ -1271,7 +1276,6 @@ ds1685_rtc_probe(struct platform_device *pdev) /* See if the platform doesn't support UIE. */ if (pdata->uie_unsupported) rtc_dev->uie_unsupported = 1; - rtc->uie_unsupported = pdata->uie_unsupported; rtc->dev = rtc_dev; @@ -1351,7 +1355,7 @@ ds1685_rtc_remove(struct platform_device *pdev) return 0; } -/** +/* * ds1685_rtc_driver - rtc driver properties. */ static struct platform_driver ds1685_rtc_driver = { |