+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * intel_mid_vrtc.c: Driver for virtual RTC device on Intel MID platform
- *
- * (C) Copyright 2009 Intel Corporation
- *
- * 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/export.h>
-#include <linux/init.h>
-#include <linux/sfi.h>
-#include <linux/platform_device.h>
-#include <linux/mc146818rtc.h>
-
-#include <asm/intel-mid.h>
-#include <asm/intel_mid_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_GPL(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_GPL(vrtc_cmos_write);
-
-void vrtc_get_time(struct timespec64 *now)
-{
- u8 sec, min, hour, mday, mon;
- unsigned long flags;
- u32 year;
-
- spin_lock_irqsave(&rtc_lock, flags);
-
- 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);
-
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- /* vRTC YEAR reg contains the offset to 1972 */
- year += 1972;
-
- pr_info("vRTC: sec: %d min: %d hour: %d day: %d "
- "mon: %d year: %d\n", sec, min, hour, mday, mon, year);
-
- now->tv_sec = mktime64(year, mon, mday, hour, min, sec);
- now->tv_nsec = 0;
-}
-
-int vrtc_set_mmss(const struct timespec64 *now)
-{
- unsigned long flags;
- struct rtc_time tm;
- int year;
- int retval = 0;
-
- rtc_time64_to_tm(now->tv_sec, &tm);
- if (!rtc_valid_tm(&tm) && tm.tm_year >= 72) {
- /*
- * tm.year is the number of years since 1900, and the
- * vrtc need the years since 1972.
- */
- year = tm.tm_year - 72;
- spin_lock_irqsave(&rtc_lock, flags);
- vrtc_cmos_write(year, RTC_YEAR);
- vrtc_cmos_write(tm.tm_mon, RTC_MONTH);
- vrtc_cmos_write(tm.tm_mday, RTC_DAY_OF_MONTH);
- vrtc_cmos_write(tm.tm_hour, RTC_HOURS);
- vrtc_cmos_write(tm.tm_min, RTC_MINUTES);
- vrtc_cmos_write(tm.tm_sec, RTC_SECONDS);
- spin_unlock_irqrestore(&rtc_lock, flags);
- } else {
- pr_err("%s: Invalid vRTC value: write of %llx to vRTC failed\n",
- __func__, (s64)now->tv_sec);
- retval = -EINVAL;
- }
- return retval;
-}
-
-void __init intel_mid_rtc_init(void)
-{
- unsigned long vrtc_paddr;
-
- sfi_table_parse(SFI_SIG_MRTC, NULL, NULL, sfi_parse_mrtc);
-
- vrtc_paddr = sfi_mrtc_array[0].phys_addr;
- if (!sfi_mrtc_num || !vrtc_paddr)
- return;
-
- vrtc_virt_base = (void __iomem *)set_fixmap_offset_nocache(FIX_LNW_VRTC,
- vrtc_paddr);
- x86_platform.get_wallclock = vrtc_get_time;
- x86_platform.set_wallclock = vrtc_set_mmss;
-}
-
-/*
- * The Moorestown platform has a memory mapped virtual RTC device that emulates
- * the programming interface of the RTC.
- */
-
-static struct resource vrtc_resources[] = {
- [0] = {
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .flags = IORESOURCE_IRQ,
- }
-};
-
-static struct platform_device vrtc_device = {
- .name = "rtc_mrst",
- .id = -1,
- .resource = vrtc_resources,
- .num_resources = ARRAY_SIZE(vrtc_resources),
-};
-
-/* Register the RTC device if appropriate */
-static int __init intel_mid_device_create(void)
-{
- /* No Moorestown, no device */
- if (!intel_mid_identify_cpu())
- return -ENODEV;
- /* No timer, no device */
- if (!sfi_mrtc_num)
- return -ENODEV;
-
- /* iomem resource */
- vrtc_resources[0].start = sfi_mrtc_array[0].phys_addr;
- vrtc_resources[0].end = sfi_mrtc_array[0].phys_addr +
- MRST_VRTC_MAP_SZ;
- /* irq resource */
- vrtc_resources[1].start = sfi_mrtc_array[0].irq;
- vrtc_resources[1].end = sfi_mrtc_array[0].irq;
-
- return platform_device_register(&vrtc_device);
-}
-device_initcall(intel_mid_device_create);
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/intel-mid.h>
-#include <asm/intel_mid_vrtc.h>
#include <asm/io.h>
#include <asm/i8259.h>
#include <asm/intel_scu_ipc.h>
static int i2c_bus[MAX_SCU_I2C];
static int gpio_num_entry;
static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM];
-int sfi_mrtc_num;
int sfi_mtimer_num;
-struct sfi_rtc_table_entry sfi_mrtc_array[SFI_MRTC_MAX];
-EXPORT_SYMBOL_GPL(sfi_mrtc_array);
-
struct blocking_notifier_head intel_scu_notifier =
BLOCKING_NOTIFIER_INIT(intel_scu_notifier);
EXPORT_SYMBOL_GPL(intel_scu_notifier);
}
}
-/* parse all the mrtc info to a global mrtc array */
-int __init sfi_parse_mrtc(struct sfi_table_header *table)
-{
- struct sfi_table_simple *sb;
- struct sfi_rtc_table_entry *pentry;
- struct mpc_intsrc mp_irq;
-
- int totallen;
-
- sb = (struct sfi_table_simple *)table;
- if (!sfi_mrtc_num) {
- sfi_mrtc_num = SFI_GET_NUM_ENTRIES(sb,
- struct sfi_rtc_table_entry);
- pentry = (struct sfi_rtc_table_entry *)sb->pentry;
- totallen = sfi_mrtc_num * sizeof(*pentry);
- memcpy(sfi_mrtc_array, pentry, totallen);
- }
-
- pr_debug("SFI RTC info (num = %d):\n", sfi_mrtc_num);
- pentry = sfi_mrtc_array;
- for (totallen = 0; totallen < sfi_mrtc_num; totallen++, pentry++) {
- pr_debug("RTC[%d]: paddr = 0x%08x, irq = %d\n",
- totallen, (u32)pentry->phys_addr, pentry->irq);
- mp_irq.type = MP_INTSRC;
- mp_irq.irqtype = mp_INT;
- mp_irq.irqflag = MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW;
- mp_irq.srcbus = MP_BUS_ISA;
- mp_irq.srcbusirq = pentry->irq; /* IRQ */
- mp_irq.dstapic = MP_APIC_ALL;
- mp_irq.dstirq = pentry->irq;
- mp_save_irq(&mp_irq);
- mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC, NULL);
- }
- return 0;
-}
-
-
/*
* Parsing GPIO table first, since the DEVS table will need this table
* to map the pin name to the actual pin.
projects / platform / kernel / linux-starfive.git / commitdiff