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Date: Wed, 5 Dec 2012 01:49:09 -0500
From: Chao Xie <chao.xie@...vell.com>
To: haojian.zhuang@...il.com, xiechao.mail@...il.com,
linux@....linux.org.uk, a.zummo@...ertech.it,
rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead, robert.jarzmik@...e.fr
Cc: Chao Xie <chao.xie@...vell.com>
Subject: [V2 PATCH 2/2] rtc: pxa: add pxa95x rtc support
the pxa95x rtc need access PBSR register before write to
RTTR, RCNR, RDCR, and RYCR registers.
Signed-off-by: Chao Xie <chao.xie@...vell.com>
---
drivers/rtc/rtc-pxa.c | 100 +++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 85 insertions(+), 15 deletions(-)
diff --git a/drivers/rtc/rtc-pxa.c b/drivers/rtc/rtc-pxa.c
index f771b2e..aee23cb 100644
--- a/drivers/rtc/rtc-pxa.c
+++ b/drivers/rtc/rtc-pxa.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/delay.h>
#include <mach/hardware.h>
@@ -77,14 +78,28 @@
#define RTCPICR 0x34
#define PIAR 0x38
+#define PSBR_RTC 0x00
+
#define rtc_readl(pxa_rtc, reg) \
__raw_readl((pxa_rtc)->base + (reg))
#define rtc_writel(pxa_rtc, reg, value) \
__raw_writel((value), (pxa_rtc)->base + (reg))
+#define rtc_readl_psbr(pxa_rtc, reg) \
+ __raw_readl((pxa_rtc)->base_psbr + (reg))
+#define rtc_writel_psbr(pxa_rtc, reg, value) \
+ __raw_writel((value), (pxa_rtc)->base_psbr + (reg))
+
+enum {
+ RTC_PXA27X,
+ RTC_PXA95X,
+};
struct pxa_rtc {
struct resource *ress;
+ struct resource *ress_psbr;
+ unsigned int id;
void __iomem *base;
+ void __iomem *base_psbr;
int irq_1Hz;
int irq_Alrm;
struct rtc_device *rtc;
@@ -242,9 +257,26 @@ static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+ /*
+ * sequence to wirte pxa rtc register RCNR RDCR RYCR is
+ * 1. set PSBR[RWE] bit, take 2x32-khz to complete
+ * 2. write to RTC register,take 2x32-khz to complete
+ * 3. clear PSBR[RWE] bit,take 2x32-khz to complete
+ */
+ if (pxa_rtc->id == RTC_PXA95X) {
+ rtc_writel_psbr(pxa_rtc, PSBR_RTC, 0x01);
+ udelay(100);
+ }
+
rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm));
rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm));
+ if (pxa_rtc->id == RTC_PXA95X) {
+ udelay(100);
+ rtc_writel_psbr(pxa_rtc, PSBR_RTC, 0x00);
+ udelay(100);
+ }
+
return 0;
}
@@ -310,6 +342,20 @@ static const struct rtc_class_ops pxa_rtc_ops = {
.proc = pxa_rtc_proc,
};
+static struct of_device_id pxa_rtc_dt_ids[] = {
+ { .compatible = "marvell,pxa-rtc", .data = (void *)RTC_PXA27X },
+ { .compatible = "marvell,pxa95x-rtc", .data = (void *)RTC_PXA95X },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids);
+
+static const struct platform_device_id pxa_rtc_id_table[] = {
+ { "pxa-rtc", RTC_PXA27X },
+ { "pxa95x-rtc", RTC_PXA95X },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, pxa_rtc_id_table);
+
static int __init pxa_rtc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -324,13 +370,34 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
spin_lock_init(&pxa_rtc->lock);
platform_set_drvdata(pdev, pxa_rtc);
+ if (pdev->dev.of_node) {
+ const struct of_device_id *of_id =
+ of_match_device(pxa_rtc_dt_ids, &pdev->dev);
+
+ pxa_rtc->id = (unsigned int)(of_id->data);
+ } else {
+ const struct platform_device_id *id =
+ platform_get_device_id(pdev);
+
+ pxa_rtc->id = id->driver_data;
+ }
+
ret = -ENXIO;
pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!pxa_rtc->ress) {
- dev_err(dev, "No I/O memory resource defined\n");
+ dev_err(dev, "No I/O memory resource(id=0) defined\n");
goto err_ress;
}
+ if (pxa_rtc->id == RTC_PXA95X) {
+ pxa_rtc->ress_psbr =
+ platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!pxa_rtc->ress_psbr) {
+ dev_err(dev, "No I/O memory resource(id=1) defined\n");
+ goto err_ress;
+ }
+ }
+
pxa_rtc->irq_1Hz = platform_get_irq(pdev, 0);
if (pxa_rtc->irq_1Hz < 0) {
dev_err(dev, "No 1Hz IRQ resource defined\n");
@@ -347,7 +414,17 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
resource_size(pxa_rtc->ress));
if (!pxa_rtc->base) {
dev_err(&pdev->dev, "Unable to map pxa RTC I/O memory\n");
- goto err_map;
+ goto err_map_base;
+ }
+
+ if (pxa_rtc->id == RTC_PXA95X) {
+ pxa_rtc->base_psbr = ioremap(pxa_rtc->ress_psbr->start,
+ resource_size(pxa_rtc->ress_psbr));
+ if (!pxa_rtc->base_psbr) {
+ dev_err(&pdev->dev,
+ "Unable to map pxa RTC PSBR I/O memory\n");
+ goto err_map_base_psbr;
+ }
}
/*
@@ -376,9 +453,12 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
return 0;
err_rtc_reg:
+ if (pxa_rtc->id == RTC_PXA95X)
+ iounmap(pxa_rtc->base_psbr);
+err_map_base_psbr:
iounmap(pxa_rtc->base);
+err_map_base:
err_ress:
-err_map:
kfree(pxa_rtc);
return ret;
}
@@ -398,14 +478,6 @@ static int __exit pxa_rtc_remove(struct platform_device *pdev)
return 0;
}
-#ifdef CONFIG_OF
-static struct of_device_id pxa_rtc_dt_ids[] = {
- { .compatible = "marvell,pxa-rtc" },
- {}
-};
-MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids);
-#endif
-
#ifdef CONFIG_PM
static int pxa_rtc_suspend(struct device *dev)
{
@@ -440,14 +512,12 @@ static struct platform_driver pxa_rtc_driver = {
.pm = &pxa_rtc_pm_ops,
#endif
},
+ .id_table = pxa_rtc_id_table,
};
static int __init pxa_rtc_init(void)
{
- if (cpu_is_pxa27x() || cpu_is_pxa3xx())
- return platform_driver_probe(&pxa_rtc_driver, pxa_rtc_probe);
-
- return -ENODEV;
+ return platform_driver_probe(&pxa_rtc_driver, pxa_rtc_probe);
}
static void __exit pxa_rtc_exit(void)
--
1.7.4.1
--
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