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Message-ID: <20101110165019.6365.82627.stgit@localhost.localdomain>
Date: Wed, 10 Nov 2010 16:50:57 +0000
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] x86/mrst: add vrtc driver which serves as a wall clock
device
From: Feng Tang <feng.tang@...el.com>
The Moorestown platform doesn't have a m146818 RTC device like traditional
x86 PC, but a firmware emulated virtual RTC device(vrtc), which provides
some basic RTC functions like get/set time. vrtc serves as the only
wall clock device on Moorestown platform.
Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
[Moved into arch/x86/platform and tidied a spot]
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
arch/x86/include/asm/fixmap.h | 4 +
arch/x86/include/asm/mrst-vrtc.h | 9 +++
arch/x86/include/asm/mrst.h | 10 +++
arch/x86/platform/mrst/Makefile | 1
arch/x86/platform/mrst/mrst.c | 6 --
arch/x86/platform/mrst/vrtc.c | 120 ++++++++++++++++++++++++++++++++++++++
6 files changed, 143 insertions(+), 7 deletions(-)
create mode 100644 arch/x86/include/asm/mrst-vrtc.h
create mode 100644 arch/x86/platform/mrst/vrtc.c
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 4d293dc..139591a 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -117,6 +117,10 @@ enum fixed_addresses {
FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
__end_of_permanent_fixed_addresses,
+
+#ifdef CONFIG_X86_MRST
+ FIX_LNW_VRTC,
+#endif
/*
* 256 temporary boot-time mappings, used by early_ioremap(),
* before ioremap() is functional.
diff --git a/arch/x86/include/asm/mrst-vrtc.h b/arch/x86/include/asm/mrst-vrtc.h
new file mode 100644
index 0000000..73668ab
--- /dev/null
+++ b/arch/x86/include/asm/mrst-vrtc.h
@@ -0,0 +1,9 @@
+#ifndef _MRST_VRTC_H
+#define _MRST_VRTC_H
+
+extern unsigned char vrtc_cmos_read(unsigned char reg);
+extern void vrtc_cmos_write(unsigned char val, unsigned char reg);
+extern unsigned long vrtc_get_time(void);
+extern int vrtc_set_mmss(unsigned long nowtime);
+
+#endif
diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index 283debd..719f00b 100644
--- a/arch/x86/include/asm/mrst.h
+++ b/arch/x86/include/asm/mrst.h
@@ -14,7 +14,9 @@
#include <linux/sfi.h>
extern int pci_mrst_init(void);
-int __init sfi_parse_mrtc(struct sfi_table_header *table);
+extern int __init sfi_parse_mrtc(struct sfi_table_header *table);
+extern int sfi_mrtc_num;
+extern struct sfi_rtc_table_entry sfi_mrtc_array[];
/*
* Medfield is the follow-up of Moorestown, it combines two chip solution into
@@ -54,4 +56,10 @@ extern void hsu_early_console_init(void);
extern void intel_scu_devices_create(void);
extern void intel_scu_devices_destroy(void);
+/* VRTC timer */
+#define MRST_VRTC_MAP_SZ (1024)
+/*#define MRST_VRTC_PGOFFSET (0xc00) */
+
+extern void mrst_rtc_init(void);
+
#endif /* _ASM_X86_MRST_H */
diff --git a/arch/x86/platform/mrst/Makefile b/arch/x86/platform/mrst/Makefile
index efbbc55..4d3e256 100644
--- a/arch/x86/platform/mrst/Makefile
+++ b/arch/x86/platform/mrst/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_X86_MRST) += mrst.o
+obj-$(CONFIG_X86_MRST) += vrtc.o
diff --git a/arch/x86/platform/mrst/mrst.c b/arch/x86/platform/mrst/mrst.c
index 10fec10..a3fe2fd 100644
--- a/arch/x86/platform/mrst/mrst.c
+++ b/arch/x86/platform/mrst/mrst.c
@@ -37,7 +37,6 @@
#include <asm/apb_timer.h>
#include <asm/reboot.h>
-
/*
* the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,
* cmdline option x86_mrst_timer can be used to override the configuration
@@ -242,11 +241,6 @@ void __init mrst_time_init(void)
apbt_time_init();
}
-void __init mrst_rtc_init(void)
-{
- sfi_table_parse(SFI_SIG_MRTC, NULL, NULL, sfi_parse_mrtc);
-}
-
void __cpuinit mrst_arch_setup(void)
{
if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x27)
diff --git a/arch/x86/platform/mrst/vrtc.c b/arch/x86/platform/mrst/vrtc.c
new file mode 100644
index 0000000..00c564d
--- /dev/null
+++ b/arch/x86/platform/mrst/vrtc.c
@@ -0,0 +1,120 @@
+/*
+ * vrtc.c: Driver for virtual RTC device on Intel MID platform
+ *
+ * (C) Copyright 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ *
+ * Note:
+ * VRTC is emulated by system controller firmware, the real HW
+ * RTC is located in the PMIC device. SCU FW shadows PMIC RTC
+ * in a memory mapped IO space that is visible to the host IA
+ * processor.
+ *
+ * This driver is based on RTC CMOS driver.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sfi.h>
+
+#include <asm/mrst.h>
+#include <asm/mrst-vrtc.h>
+#include <asm/time.h>
+#include <asm/fixmap.h>
+
+static unsigned char __iomem *vrtc_virt_base;
+
+unsigned char vrtc_cmos_read(unsigned char reg)
+{
+ unsigned char retval;
+
+ /* vRTC's registers range from 0x0 to 0xD */
+ if (reg > 0xd || !vrtc_virt_base)
+ return 0xff;
+
+ lock_cmos_prefix(reg);
+ retval = __raw_readb(vrtc_virt_base + (reg << 2));
+ lock_cmos_suffix(reg);
+ return retval;
+}
+EXPORT_SYMBOL(vrtc_cmos_read);
+
+void vrtc_cmos_write(unsigned char val, unsigned char reg)
+{
+ if (reg > 0xd || !vrtc_virt_base)
+ return;
+
+ lock_cmos_prefix(reg);
+ __raw_writeb(val, vrtc_virt_base + (reg << 2));
+ lock_cmos_suffix(reg);
+}
+EXPORT_SYMBOL(vrtc_cmos_write);
+
+unsigned long vrtc_get_time(void)
+{
+ u8 sec, min, hour, mday, mon;
+ u32 year;
+
+ while ((vrtc_cmos_read(RTC_FREQ_SELECT) & RTC_UIP))
+ cpu_relax();
+
+ sec = vrtc_cmos_read(RTC_SECONDS);
+ min = vrtc_cmos_read(RTC_MINUTES);
+ hour = vrtc_cmos_read(RTC_HOURS);
+ mday = vrtc_cmos_read(RTC_DAY_OF_MONTH);
+ mon = vrtc_cmos_read(RTC_MONTH);
+ year = vrtc_cmos_read(RTC_YEAR);
+
+ /* vRTC YEAR reg contains the offset to 1960 */
+ year += 1960;
+
+ printk(KERN_INFO "vRTC: sec: %d min: %d hour: %d day: %d "
+ "mon: %d year: %d\n", sec, min, hour, mday, mon, year);
+
+ return mktime(year, mon, mday, hour, min, sec);
+}
+
+/* Only care about the minutes and seconds */
+int vrtc_set_mmss(unsigned long nowtime)
+{
+ int real_sec, real_min;
+ int vrtc_min;
+
+ vrtc_min = vrtc_cmos_read(RTC_MINUTES);
+
+ real_sec = nowtime % 60;
+ real_min = nowtime / 60;
+ if (((abs(real_min - vrtc_min) + 15)/30) & 1)
+ real_min += 30;
+ real_min %= 60;
+
+ vrtc_cmos_write(real_sec, RTC_SECONDS);
+ vrtc_cmos_write(real_min, RTC_MINUTES);
+ return 0;
+}
+
+void __init mrst_rtc_init(void)
+{
+ unsigned long rtc_paddr;
+ void __iomem *virt_base;
+
+ sfi_table_parse(SFI_SIG_MRTC, NULL, NULL, sfi_parse_mrtc);
+ if (!sfi_mrtc_num)
+ return;
+
+ rtc_paddr = sfi_mrtc_array[0].phys_addr;
+
+ /* vRTC's register address may not be page aligned */
+ set_fixmap_nocache(FIX_LNW_VRTC, rtc_paddr);
+
+ virt_base = (void __iomem *)__fix_to_virt(FIX_LNW_VRTC);
+ virt_base += rtc_paddr & ~PAGE_MASK;
+ vrtc_virt_base = virt_base;
+
+ x86_platform.get_wallclock = vrtc_get_time;
+ x86_platform.set_wallclock = vrtc_set_mmss;
+}
--
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