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rtc: omap: kicker mechanism support 

OMAP RTC IP can have kicker feature.  This prevents spurious writes to
register.  To write to registers kicker lock has to be released.
Procedure to do it as follows,

1. write to kick0 register, 0x83e70b13
2. write to kick1 register, 0x95a4f1e0

Writing value other than 0x83e70b13 to kick0 enables write locking, more
details about kicker mechanism can be found in section 20.3.3.5.3 of
AM335X TRM @www.ti.com/am335x

Here id table information is added and is used to distinguish those that
require kicker handling and the ones that doesn't need it.  There are more
features in the newer IP's compared to legacy ones other than kicker,
which driver currently doesn't handle, supporting additional features
would be easier with the addition of id table.

Older IP (of OMAP1) doesn't have revision register as per TRM, so revision
register can't be relied always to find features, hence id table is being
used.

While at it, replace __raw_writeb/__raw_readb with writeb/readb; this
driver is used on ARMv7 (AM335X SoC)

Signed-off-by: Afzal Mohammed <afzal@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Afzal Mohammed 2012-12-17 16:02:11 -08:00 committed by Linus Torvalds
parent 6899e92d65
commit cab1458c8c
1 changed files with 41 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/rtc/rtc-omap.c
View File

@ -38,6 +38,8 @@
* the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment.
*/
#define DRIVER_NAME "omap_rtc"
#define OMAP_RTC_BASE 0xfffb4800
/* RTC registers */
@ -64,6 +66,9 @@
#define OMAP_RTC_COMP_MSB_REG 0x50
#define OMAP_RTC_OSC_REG 0x54
#define OMAP_RTC_KICK0_REG 0x6c
#define OMAP_RTC_KICK1_REG 0x70
/* OMAP_RTC_CTRL_REG bit fields: */
#define OMAP_RTC_CTRL_SPLIT (1<<7)
#define OMAP_RTC_CTRL_DISABLE (1<<6)
@ -88,10 +93,18 @@
#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
#define KICK1_VALUE 0x95a4f1e0
#define OMAP_RTC_HAS_KICKER 0x1
static void __iomem *rtc_base;
#define rtc_read(addr) __raw_readb(rtc_base + (addr))
#define rtc_write(val, addr) __raw_writeb(val, rtc_base + (addr))
#define rtc_read(addr) readb(rtc_base + (addr))
#define rtc_write(val, addr) writeb(val, rtc_base + (addr))
#define rtc_writel(val, addr) writel(val, rtc_base + (addr))
/* we rely on the rtc framework to handle locking (rtc->ops_lock),
@ -285,11 +298,23 @@ static struct rtc_class_ops omap_rtc_ops = {
static int omap_rtc_alarm;
static int omap_rtc_timer;
static struct platform_device_id omap_rtc_devtype[] = {
{
.name = DRIVER_NAME,
}, {
.name = "da830-rtc",
.driver_data = OMAP_RTC_HAS_KICKER,
},
{},
};
MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);
static int __init omap_rtc_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
struct rtc_device *rtc;
u8 reg, new_ctrl;
const struct platform_device_id *id_entry;
omap_rtc_timer = platform_get_irq(pdev, 0);
if (omap_rtc_timer <= 0) {
@ -322,6 +347,12 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
goto fail;
}
id_entry = platform_get_device_id(pdev);
if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER)) {
rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG);
rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG);
}
rtc = rtc_device_register(pdev->name, &pdev->dev,
&omap_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
@ -398,6 +429,8 @@ fail2:
fail1:
rtc_device_unregister(rtc);
fail0:
if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
rtc_writel(0, OMAP_RTC_KICK0_REG);
iounmap(rtc_base);
fail:
release_mem_region(mem->start, resource_size(mem));
@ -408,6 +441,8 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
{
struct rtc_device *rtc = platform_get_drvdata(pdev);
struct resource *mem = dev_get_drvdata(&rtc->dev);
const struct platform_device_id *id_entry =
platform_get_device_id(pdev);
device_init_wakeup(&pdev->dev, 0);
@ -420,6 +455,8 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
free_irq(omap_rtc_alarm, rtc);
rtc_device_unregister(rtc);
if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
rtc_writel(0, OMAP_RTC_KICK0_REG);
iounmap(rtc_base);
release_mem_region(mem->start, resource_size(mem));
return 0;
@ -471,9 +508,10 @@ static struct platform_driver omap_rtc_driver = {
.resume = omap_rtc_resume,
.shutdown = omap_rtc_shutdown,
.driver = {
.name = "omap_rtc",
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.id_table = omap_rtc_devtype,
};
static int __init rtc_init(void)