| Message ID | 1410441525-25258-6-git-send-email-boris.brezillon@free-electrons.com |
|---|---|
| State | Superseded |
| Headers | show |
On Thu, 11 Sep 2014 15:18:41 +0200 Boris BREZILLON <boris.brezillon@free-electrons.com> wrote: > The GPBR registers are not part of the RTT block and thus should not be > defined in the reg property of the rtt node. > > Use syscon to provide a proper DT representation and reference the GPBR > syscon device in a new "atmel,time-reg" property which store both the > syscon device phandle and the register offset within the GPBR block. > > When using non DT boards, we won't be able to retrieve the syscon regmap, > hence we need to create our own regmap using the memory region defined > in the 2nd memory resource assigned to the RTT platform device. > > Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> > --- > drivers/rtc/Kconfig | 1 + > drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++------- > 2 files changed, 51 insertions(+), 9 deletions(-) > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index a168e96..7d76da8 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200 > config RTC_DRV_AT91SAM9 > tristate "AT91SAM9x/AT91CAP9 RTT as RTC" > depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40) > + select MFD_SYSCON > help > RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT > (Real Time Timer). These timers are powered by the backup power > diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c > index d72c34d..e1b7109 100644 > --- a/drivers/rtc/rtc-at91sam9.c > +++ b/drivers/rtc/rtc-at91sam9.c > @@ -21,6 +21,8 @@ > #include <linux/slab.h> > #include <linux/platform_data/atmel.h> > #include <linux/io.h> > +#include <linux/mfd/syscon.h> > +#include <linux/regmap.h> > > /* > * This driver uses two configurable hardware resources that live in the > @@ -72,7 +74,8 @@ struct sam9_rtc { > void __iomem *rtt; > struct rtc_device *rtcdev; > u32 imr; > - void __iomem *gpbr; > + struct regmap *gpbr; > + unsigned int gpbr_offset; > int irq; > }; > > @@ -81,10 +84,19 @@ struct sam9_rtc { > #define rtt_writel(rtc, field, val) \ > writel((val), (rtc)->rtt + AT91_RTT_ ## field) > > -#define gpbr_readl(rtc) \ > - readl((rtc)->gpbr) > -#define gpbr_writel(rtc, val) \ > - writel((val), (rtc)->gpbr) > +static inline unsigned int gpbr_readl(struct sam9_rtc *rtc) > +{ > + unsigned int val; > + > + regmap_read(rtc->gpbr, rtc->gpbr_offset, &val); > + > + return val; > +} > + > +static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val) > +{ > + regmap_write(rtc->gpbr, rtc->gpbr_offset, val); > +} > > /* > * Read current time and date in RTC > @@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = { > .alarm_irq_enable = at91_rtc_alarm_irq_enable, > }; > > +static struct regmap_config gpbr_regmap_config = { > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > +}; > + > /* > * Initialize and install RTC driver > */ > @@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev) > if (IS_ERR(rtc->rtt)) > return PTR_ERR(rtc->rtt); > > - r = platform_get_resource(pdev, IORESOURCE_MEM, 1); > - rtc->gpbr = devm_ioremap_resource(&pdev->dev, r); > - if (IS_ERR(rtc->gpbr)) > - return PTR_ERR(rtc->rtt); > + if (!pdev->dev.of_node) { > + void __iomem *gpbr; > + > + r = platform_get_resource(pdev, IORESOURCE_MEM, 1); > + gpbr = devm_ioremap_resource(&pdev->dev, r); > + if (IS_ERR(gpbr)) > + return PTR_ERR(gpbr); > + > + rtc->gpbr = regmap_init_mmio(NULL, gpbr, > + &gpbr_regmap_config); > + } else { > + struct of_phandle_args args; > + > + ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node, > + "atmel,time-reg", 1, 0, I forgot to change the property name here ^ Should be "atmel,rtt-rtc-time-reg". I'll fix that and send a new version of this patch (not the whole series). Sorry for the inconvenience.
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index a168e96..7d76da8 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200 config RTC_DRV_AT91SAM9 tristate "AT91SAM9x/AT91CAP9 RTT as RTC" depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40) + select MFD_SYSCON help RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT (Real Time Timer). These timers are powered by the backup power diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c index d72c34d..e1b7109 100644 --- a/drivers/rtc/rtc-at91sam9.c +++ b/drivers/rtc/rtc-at91sam9.c @@ -21,6 +21,8 @@ #include <linux/slab.h> #include <linux/platform_data/atmel.h> #include <linux/io.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> /* * This driver uses two configurable hardware resources that live in the @@ -72,7 +74,8 @@ struct sam9_rtc { void __iomem *rtt; struct rtc_device *rtcdev; u32 imr; - void __iomem *gpbr; + struct regmap *gpbr; + unsigned int gpbr_offset; int irq; }; @@ -81,10 +84,19 @@ struct sam9_rtc { #define rtt_writel(rtc, field, val) \ writel((val), (rtc)->rtt + AT91_RTT_ ## field) -#define gpbr_readl(rtc) \ - readl((rtc)->gpbr) -#define gpbr_writel(rtc, val) \ - writel((val), (rtc)->gpbr) +static inline unsigned int gpbr_readl(struct sam9_rtc *rtc) +{ + unsigned int val; + + regmap_read(rtc->gpbr, rtc->gpbr_offset, &val); + + return val; +} + +static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val) +{ + regmap_write(rtc->gpbr, rtc->gpbr_offset, val); +} /* * Read current time and date in RTC @@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = { .alarm_irq_enable = at91_rtc_alarm_irq_enable, }; +static struct regmap_config gpbr_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + /* * Initialize and install RTC driver */ @@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev) if (IS_ERR(rtc->rtt)) return PTR_ERR(rtc->rtt); - r = platform_get_resource(pdev, IORESOURCE_MEM, 1); - rtc->gpbr = devm_ioremap_resource(&pdev->dev, r); - if (IS_ERR(rtc->gpbr)) - return PTR_ERR(rtc->rtt); + if (!pdev->dev.of_node) { + void __iomem *gpbr; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 1); + gpbr = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(gpbr)) + return PTR_ERR(gpbr); + + rtc->gpbr = regmap_init_mmio(NULL, gpbr, + &gpbr_regmap_config); + } else { + struct of_phandle_args args; + + ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node, + "atmel,time-reg", 1, 0, + &args); + if (ret) + return ret; + + rtc->gpbr = syscon_node_to_regmap(args.np); + rtc->gpbr_offset = args.args[0]; + } + + if (IS_ERR(rtc->gpbr)) { + dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n"); + return -ENOMEM; + } mr = rtt_readl(rtc, MR);
The GPBR registers are not part of the RTT block and thus should not be defined in the reg property of the rtt node. Use syscon to provide a proper DT representation and reference the GPBR syscon device in a new "atmel,time-reg" property which store both the syscon device phandle and the register offset within the GPBR block. When using non DT boards, we won't be able to retrieve the syscon regmap, hence we need to create our own regmap using the memory region defined in the 2nd memory resource assigned to the RTT platform device. Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> --- drivers/rtc/Kconfig | 1 + drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++------- 2 files changed, 51 insertions(+), 9 deletions(-)