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author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2017-02-10 11:11:56 -0700 |
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committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-02-12 01:07:38 +0100 |
commit | 8057c86d43a6579421c97b00c6df1ab0bc5e51a0 (patch) | |
tree | fd58603905dbd9d5b5addda56f8db36cb4ca8fc8 /drivers/rtc | |
parent | 68b54f477fae4f50a4010a1b5019bd185d452fa7 (diff) | |
download | linux-stable-8057c86d43a6579421c97b00c6df1ab0bc5e51a0.tar.gz linux-stable-8057c86d43a6579421c97b00c6df1ab0bc5e51a0.tar.bz2 linux-stable-8057c86d43a6579421c97b00c6df1ab0bc5e51a0.zip |
rtc: m48t86: allow driver to manage its resources
Allow this driver to, optionally, manage it's own resources and do the
read/write operations if the platform does not provide them.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r-- | drivers/rtc/rtc-m48t86.c | 153 |
1 files changed, 102 insertions, 51 deletions
diff --git a/drivers/rtc/rtc-m48t86.c b/drivers/rtc/rtc-m48t86.c index 30648ea9e8e0..4dcdbd2a2408 100644 --- a/drivers/rtc/rtc-m48t86.c +++ b/drivers/rtc/rtc-m48t86.c @@ -18,6 +18,7 @@ #include <linux/platform_device.h> #include <linux/platform_data/rtc-m48t86.h> #include <linux/bcd.h> +#include <linux/io.h> #define M48T86_SEC 0x00 #define M48T86_SECALRM 0x01 @@ -38,39 +39,72 @@ #define M48T86_D 0x0d #define M48T86_D_VRT BIT(7) +struct m48t86_rtc_info { + void __iomem *index_reg; + void __iomem *data_reg; + struct rtc_device *rtc; + struct m48t86_ops *ops; +}; + +static unsigned char m48t86_readb(struct device *dev, unsigned long addr) +{ + struct m48t86_rtc_info *info = dev_get_drvdata(dev); + unsigned char value; + + if (info->ops) { + value = info->ops->readbyte(addr); + } else { + writeb(addr, info->index_reg); + value = readb(info->data_reg); + } + return value; +} + +static void m48t86_writeb(struct device *dev, + unsigned char value, unsigned long addr) +{ + struct m48t86_rtc_info *info = dev_get_drvdata(dev); + + if (info->ops) { + info->ops->writebyte(value, addr); + } else { + writeb(addr, info->index_reg); + writeb(value, info->data_reg); + } +} + static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm) { unsigned char reg; - struct platform_device *pdev = to_platform_device(dev); - struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); - reg = ops->readbyte(M48T86_B); + reg = m48t86_readb(dev, M48T86_B); if (reg & M48T86_B_DM) { /* data (binary) mode */ - tm->tm_sec = ops->readbyte(M48T86_SEC); - tm->tm_min = ops->readbyte(M48T86_MIN); - tm->tm_hour = ops->readbyte(M48T86_HOUR) & 0x3f; - tm->tm_mday = ops->readbyte(M48T86_DOM); + tm->tm_sec = m48t86_readb(dev, M48T86_SEC); + tm->tm_min = m48t86_readb(dev, M48T86_MIN); + tm->tm_hour = m48t86_readb(dev, M48T86_HOUR) & 0x3f; + tm->tm_mday = m48t86_readb(dev, M48T86_DOM); /* tm_mon is 0-11 */ - tm->tm_mon = ops->readbyte(M48T86_MONTH) - 1; - tm->tm_year = ops->readbyte(M48T86_YEAR) + 100; - tm->tm_wday = ops->readbyte(M48T86_DOW); + tm->tm_mon = m48t86_readb(dev, M48T86_MONTH) - 1; + tm->tm_year = m48t86_readb(dev, M48T86_YEAR) + 100; + tm->tm_wday = m48t86_readb(dev, M48T86_DOW); } else { /* bcd mode */ - tm->tm_sec = bcd2bin(ops->readbyte(M48T86_SEC)); - tm->tm_min = bcd2bin(ops->readbyte(M48T86_MIN)); - tm->tm_hour = bcd2bin(ops->readbyte(M48T86_HOUR) & 0x3f); - tm->tm_mday = bcd2bin(ops->readbyte(M48T86_DOM)); + tm->tm_sec = bcd2bin(m48t86_readb(dev, M48T86_SEC)); + tm->tm_min = bcd2bin(m48t86_readb(dev, M48T86_MIN)); + tm->tm_hour = bcd2bin(m48t86_readb(dev, M48T86_HOUR) & + 0x3f); + tm->tm_mday = bcd2bin(m48t86_readb(dev, M48T86_DOM)); /* tm_mon is 0-11 */ - tm->tm_mon = bcd2bin(ops->readbyte(M48T86_MONTH)) - 1; - tm->tm_year = bcd2bin(ops->readbyte(M48T86_YEAR)) + 100; - tm->tm_wday = bcd2bin(ops->readbyte(M48T86_DOW)); + tm->tm_mon = bcd2bin(m48t86_readb(dev, M48T86_MONTH)) - 1; + tm->tm_year = bcd2bin(m48t86_readb(dev, M48T86_YEAR)) + 100; + tm->tm_wday = bcd2bin(m48t86_readb(dev, M48T86_DOW)); } /* correct the hour if the clock is in 12h mode */ if (!(reg & M48T86_B_H24)) - if (ops->readbyte(M48T86_HOUR) & 0x80) + if (m48t86_readb(dev, M48T86_HOUR) & 0x80) tm->tm_hour += 12; return rtc_valid_tm(tm); @@ -79,38 +113,36 @@ static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm) static int m48t86_rtc_set_time(struct device *dev, struct rtc_time *tm) { unsigned char reg; - struct platform_device *pdev = to_platform_device(dev); - struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); - reg = ops->readbyte(M48T86_B); + reg = m48t86_readb(dev, M48T86_B); /* update flag and 24h mode */ reg |= M48T86_B_SET | M48T86_B_H24; - ops->writebyte(reg, M48T86_B); + m48t86_writeb(dev, reg, M48T86_B); if (reg & M48T86_B_DM) { /* data (binary) mode */ - ops->writebyte(tm->tm_sec, M48T86_SEC); - ops->writebyte(tm->tm_min, M48T86_MIN); - ops->writebyte(tm->tm_hour, M48T86_HOUR); - ops->writebyte(tm->tm_mday, M48T86_DOM); - ops->writebyte(tm->tm_mon + 1, M48T86_MONTH); - ops->writebyte(tm->tm_year % 100, M48T86_YEAR); - ops->writebyte(tm->tm_wday, M48T86_DOW); + m48t86_writeb(dev, tm->tm_sec, M48T86_SEC); + m48t86_writeb(dev, tm->tm_min, M48T86_MIN); + m48t86_writeb(dev, tm->tm_hour, M48T86_HOUR); + m48t86_writeb(dev, tm->tm_mday, M48T86_DOM); + m48t86_writeb(dev, tm->tm_mon + 1, M48T86_MONTH); + m48t86_writeb(dev, tm->tm_year % 100, M48T86_YEAR); + m48t86_writeb(dev, tm->tm_wday, M48T86_DOW); } else { /* bcd mode */ - ops->writebyte(bin2bcd(tm->tm_sec), M48T86_SEC); - ops->writebyte(bin2bcd(tm->tm_min), M48T86_MIN); - ops->writebyte(bin2bcd(tm->tm_hour), M48T86_HOUR); - ops->writebyte(bin2bcd(tm->tm_mday), M48T86_DOM); - ops->writebyte(bin2bcd(tm->tm_mon + 1), M48T86_MONTH); - ops->writebyte(bin2bcd(tm->tm_year % 100), M48T86_YEAR); - ops->writebyte(bin2bcd(tm->tm_wday), M48T86_DOW); + m48t86_writeb(dev, bin2bcd(tm->tm_sec), M48T86_SEC); + m48t86_writeb(dev, bin2bcd(tm->tm_min), M48T86_MIN); + m48t86_writeb(dev, bin2bcd(tm->tm_hour), M48T86_HOUR); + m48t86_writeb(dev, bin2bcd(tm->tm_mday), M48T86_DOM); + m48t86_writeb(dev, bin2bcd(tm->tm_mon + 1), M48T86_MONTH); + m48t86_writeb(dev, bin2bcd(tm->tm_year % 100), M48T86_YEAR); + m48t86_writeb(dev, bin2bcd(tm->tm_wday), M48T86_DOW); } /* update ended */ reg &= ~M48T86_B_SET; - ops->writebyte(reg, M48T86_B); + m48t86_writeb(dev, reg, M48T86_B); return 0; } @@ -118,15 +150,13 @@ static int m48t86_rtc_set_time(struct device *dev, struct rtc_time *tm) static int m48t86_rtc_proc(struct device *dev, struct seq_file *seq) { unsigned char reg; - struct platform_device *pdev = to_platform_device(dev); - struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); - reg = ops->readbyte(M48T86_B); + reg = m48t86_readb(dev, M48T86_B); seq_printf(seq, "mode\t\t: %s\n", (reg & M48T86_B_DM) ? "binary" : "bcd"); - reg = ops->readbyte(M48T86_D); + reg = m48t86_readb(dev, M48T86_D); seq_printf(seq, "battery\t\t: %s\n", (reg & M48T86_D_VRT) ? "ok" : "exhausted"); @@ -140,23 +170,44 @@ static const struct rtc_class_ops m48t86_rtc_ops = { .proc = m48t86_rtc_proc, }; -static int m48t86_rtc_probe(struct platform_device *dev) +static int m48t86_rtc_probe(struct platform_device *pdev) { + struct m48t86_rtc_info *info; unsigned char reg; - struct m48t86_ops *ops = dev_get_platdata(&dev->dev); - struct rtc_device *rtc; - rtc = devm_rtc_device_register(&dev->dev, "m48t86", - &m48t86_rtc_ops, THIS_MODULE); + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->ops = dev_get_platdata(&pdev->dev); + if (!info->ops) { + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + info->index_reg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(info->index_reg)) + return PTR_ERR(info->index_reg); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + return -ENODEV; + info->data_reg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(info->data_reg)) + return PTR_ERR(info->data_reg); + } - if (IS_ERR(rtc)) - return PTR_ERR(rtc); + dev_set_drvdata(&pdev->dev, info); - platform_set_drvdata(dev, rtc); + info->rtc = devm_rtc_device_register(&pdev->dev, "m48t86", + &m48t86_rtc_ops, THIS_MODULE); + if (IS_ERR(info->rtc)) + return PTR_ERR(info->rtc); /* read battery status */ - reg = ops->readbyte(M48T86_D); - dev_info(&dev->dev, "battery %s\n", + reg = m48t86_readb(&pdev->dev, M48T86_D); + dev_info(&pdev->dev, "battery %s\n", (reg & M48T86_D_VRT) ? "ok" : "exhausted"); return 0; |