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- Generalise byte swapping assembly - Update debug addresses for STI - Validate start of physical memory with DTB - Do not clear SCTLR.nTLSMD in decompressor - amba/locomo/sa1111 devices remove method return type is void - address markers for KASAN in page table dump -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEuNNh8scc2k/wOAE+9OeQG+StrGQFAmAzrfYACgkQ9OeQG+St rGTmRQ/+MG9BO1WahlXZ9eVx6n6KmtwlzAy5m4B24GomvcXsa+T2s0Vs43hAsOQ2 f/b6n1mPlwRjAvKW8IfO243HKDE6STGbtVPae6ts586QCODs8i3MQsq4SWmM/DMk TR87hTo1zd4baVT9tkM8/UdUwQjr0yRf4ZDhcCj09tMClnV/8ZAEE9/lLkBpDoer wcuPaDtRfJhN+Pqnm8ES8KPj15nVm/GFWBFoDWZIOCjyDnl8Y/1Bnz3NeqzfwM1o O0NS/9a1tMBn7TNGkkcJCimqOLZS2OgxLND8fie0rC5fmwzVomKXE24OdXpSQCps LiGJr+iQOaX6qNqJY2h1If8F+RPwKfh4Mrk12x0MWB6Ap2iKsQ6bmtUCNatmJ4PG 5iKV5zY0SwKRYXAkXcNosEPUJqZirFHJCzrQ8IBmiSJ1cahZykWFgorDnA97kNLR Wlp2Y/037ug7EGZ0YSaXvbpuMyyjDP4TBKqBiSl7a90QYoXQg2QgcrBO3kVlh/5H Dxq9URvIpDLIGo1EUBU90kB54TUeDhJVHJWDfXNwOp4dP1Xm6b2w+d86GnUQanlC sinRut1ULMyitmIzg9F74MZKaSJ65ffEP3nZKIAlSSISQL+/bXtMDVtakVGsv1k1 w4IdACf3GqbjHig4mOX0oW7IwtyfBY+0q3udY28ASW0ujsH9qHE= =BULT -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm Pull ARM updates from Russell King: - Generalise byte swapping assembly - Update debug addresses for STI - Validate start of physical memory with DTB - Do not clear SCTLR.nTLSMD in decompressor - amba/locomo/sa1111 devices remove method return type is void - address markers for KASAN in page table dump * tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: ARM: 9065/1: OABI compat: fix build when EPOLL is not enabled ARM: 9055/1: mailbox: arm_mhuv2: make remove callback return void amba: Make use of bus_type functions amba: Make the remove callback return void vfio: platform: simplify device removal amba: reorder functions amba: Fix resource leak for drivers without .remove ARM: 9054/1: arch/arm/mm/mmu.c: Remove duplicate header ARM: 9053/1: arm/mm/ptdump:Add address markers for KASAN regions ARM: 9051/1: vdso: remove unneded extra-y addition ARM: 9050/1: Kconfig: Select ARCH_HAVE_NMI_SAFE_CMPXCHG where possible ARM: 9049/1: locomo: make locomo bus's remove callback return void ARM: 9048/1: sa1111: make sa1111 bus's remove callback return void ARM: 9047/1: smp: remove unused variable ARM: 9046/1: decompressor: Do not clear SCTLR.nTLSMD for ARMv7+ cores ARM: 9045/1: uncompress: Validate start of physical memory against passed DTB ARM: 9042/1: debug: no uncompress debugging while semihosting ARM: 9041/1: sti LL_UART: add STiH418 SBC UART0 support ARM: 9040/1: use DEBUG_UART_PHYS and DEBUG_UART_VIRT for sti LL_UART ARM: 9039/1: assembler: generalize byte swapping macro into rev_l
470 lines
12 KiB
C
470 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* drivers/rtc/rtc-pl031.c
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*
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* Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2006 (c) MontaVista Software, Inc.
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*
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* Author: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
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* Copyright 2010 (c) ST-Ericsson AB
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/io.h>
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#include <linux/bcd.h>
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#include <linux/delay.h>
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#include <linux/pm_wakeirq.h>
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#include <linux/slab.h>
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/*
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* Register definitions
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*/
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#define RTC_DR 0x00 /* Data read register */
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#define RTC_MR 0x04 /* Match register */
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#define RTC_LR 0x08 /* Data load register */
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#define RTC_CR 0x0c /* Control register */
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#define RTC_IMSC 0x10 /* Interrupt mask and set register */
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#define RTC_RIS 0x14 /* Raw interrupt status register */
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#define RTC_MIS 0x18 /* Masked interrupt status register */
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#define RTC_ICR 0x1c /* Interrupt clear register */
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/* ST variants have additional timer functionality */
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#define RTC_TDR 0x20 /* Timer data read register */
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#define RTC_TLR 0x24 /* Timer data load register */
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#define RTC_TCR 0x28 /* Timer control register */
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#define RTC_YDR 0x30 /* Year data read register */
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#define RTC_YMR 0x34 /* Year match register */
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#define RTC_YLR 0x38 /* Year data load register */
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#define RTC_CR_EN (1 << 0) /* counter enable bit */
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#define RTC_CR_CWEN (1 << 26) /* Clockwatch enable bit */
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#define RTC_TCR_EN (1 << 1) /* Periodic timer enable bit */
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/* Common bit definitions for Interrupt status and control registers */
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#define RTC_BIT_AI (1 << 0) /* Alarm interrupt bit */
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#define RTC_BIT_PI (1 << 1) /* Periodic interrupt bit. ST variants only. */
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/* Common bit definations for ST v2 for reading/writing time */
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#define RTC_SEC_SHIFT 0
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#define RTC_SEC_MASK (0x3F << RTC_SEC_SHIFT) /* Second [0-59] */
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#define RTC_MIN_SHIFT 6
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#define RTC_MIN_MASK (0x3F << RTC_MIN_SHIFT) /* Minute [0-59] */
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#define RTC_HOUR_SHIFT 12
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#define RTC_HOUR_MASK (0x1F << RTC_HOUR_SHIFT) /* Hour [0-23] */
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#define RTC_WDAY_SHIFT 17
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#define RTC_WDAY_MASK (0x7 << RTC_WDAY_SHIFT) /* Day of Week [1-7] 1=Sunday */
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#define RTC_MDAY_SHIFT 20
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#define RTC_MDAY_MASK (0x1F << RTC_MDAY_SHIFT) /* Day of Month [1-31] */
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#define RTC_MON_SHIFT 25
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#define RTC_MON_MASK (0xF << RTC_MON_SHIFT) /* Month [1-12] 1=January */
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#define RTC_TIMER_FREQ 32768
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/**
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* struct pl031_vendor_data - per-vendor variations
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* @ops: the vendor-specific operations used on this silicon version
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* @clockwatch: if this is an ST Microelectronics silicon version with a
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* clockwatch function
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* @st_weekday: if this is an ST Microelectronics silicon version that need
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* the weekday fix
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* @irqflags: special IRQ flags per variant
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*/
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struct pl031_vendor_data {
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struct rtc_class_ops ops;
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bool clockwatch;
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bool st_weekday;
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unsigned long irqflags;
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time64_t range_min;
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timeu64_t range_max;
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};
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struct pl031_local {
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struct pl031_vendor_data *vendor;
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struct rtc_device *rtc;
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void __iomem *base;
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};
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static int pl031_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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unsigned long imsc;
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/* Clear any pending alarm interrupts. */
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writel(RTC_BIT_AI, ldata->base + RTC_ICR);
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imsc = readl(ldata->base + RTC_IMSC);
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if (enabled == 1)
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writel(imsc | RTC_BIT_AI, ldata->base + RTC_IMSC);
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else
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writel(imsc & ~RTC_BIT_AI, ldata->base + RTC_IMSC);
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return 0;
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}
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/*
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* Convert Gregorian date to ST v2 RTC format.
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*/
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static int pl031_stv2_tm_to_time(struct device *dev,
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struct rtc_time *tm, unsigned long *st_time,
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unsigned long *bcd_year)
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{
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int year = tm->tm_year + 1900;
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int wday = tm->tm_wday;
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/* wday masking is not working in hardware so wday must be valid */
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if (wday < -1 || wday > 6) {
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dev_err(dev, "invalid wday value %d\n", tm->tm_wday);
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return -EINVAL;
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} else if (wday == -1) {
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/* wday is not provided, calculate it here */
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struct rtc_time calc_tm;
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rtc_time64_to_tm(rtc_tm_to_time64(tm), &calc_tm);
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wday = calc_tm.tm_wday;
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}
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*bcd_year = (bin2bcd(year % 100) | bin2bcd(year / 100) << 8);
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*st_time = ((tm->tm_mon + 1) << RTC_MON_SHIFT)
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| (tm->tm_mday << RTC_MDAY_SHIFT)
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| ((wday + 1) << RTC_WDAY_SHIFT)
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| (tm->tm_hour << RTC_HOUR_SHIFT)
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| (tm->tm_min << RTC_MIN_SHIFT)
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| (tm->tm_sec << RTC_SEC_SHIFT);
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return 0;
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}
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/*
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* Convert ST v2 RTC format to Gregorian date.
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*/
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static int pl031_stv2_time_to_tm(unsigned long st_time, unsigned long bcd_year,
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struct rtc_time *tm)
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{
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tm->tm_year = bcd2bin(bcd_year) + (bcd2bin(bcd_year >> 8) * 100);
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tm->tm_mon = ((st_time & RTC_MON_MASK) >> RTC_MON_SHIFT) - 1;
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tm->tm_mday = ((st_time & RTC_MDAY_MASK) >> RTC_MDAY_SHIFT);
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tm->tm_wday = ((st_time & RTC_WDAY_MASK) >> RTC_WDAY_SHIFT) - 1;
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tm->tm_hour = ((st_time & RTC_HOUR_MASK) >> RTC_HOUR_SHIFT);
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tm->tm_min = ((st_time & RTC_MIN_MASK) >> RTC_MIN_SHIFT);
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tm->tm_sec = ((st_time & RTC_SEC_MASK) >> RTC_SEC_SHIFT);
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tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
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tm->tm_year -= 1900;
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return 0;
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}
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static int pl031_stv2_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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pl031_stv2_time_to_tm(readl(ldata->base + RTC_DR),
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readl(ldata->base + RTC_YDR), tm);
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return 0;
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}
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static int pl031_stv2_set_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long time;
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unsigned long bcd_year;
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struct pl031_local *ldata = dev_get_drvdata(dev);
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int ret;
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ret = pl031_stv2_tm_to_time(dev, tm, &time, &bcd_year);
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if (ret == 0) {
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writel(bcd_year, ldata->base + RTC_YLR);
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writel(time, ldata->base + RTC_LR);
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}
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return ret;
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}
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static int pl031_stv2_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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int ret;
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ret = pl031_stv2_time_to_tm(readl(ldata->base + RTC_MR),
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readl(ldata->base + RTC_YMR), &alarm->time);
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alarm->pending = readl(ldata->base + RTC_RIS) & RTC_BIT_AI;
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alarm->enabled = readl(ldata->base + RTC_IMSC) & RTC_BIT_AI;
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return ret;
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}
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static int pl031_stv2_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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unsigned long time;
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unsigned long bcd_year;
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int ret;
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ret = pl031_stv2_tm_to_time(dev, &alarm->time,
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&time, &bcd_year);
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if (ret == 0) {
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writel(bcd_year, ldata->base + RTC_YMR);
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writel(time, ldata->base + RTC_MR);
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pl031_alarm_irq_enable(dev, alarm->enabled);
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}
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return ret;
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}
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static irqreturn_t pl031_interrupt(int irq, void *dev_id)
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{
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struct pl031_local *ldata = dev_id;
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unsigned long rtcmis;
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unsigned long events = 0;
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rtcmis = readl(ldata->base + RTC_MIS);
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if (rtcmis & RTC_BIT_AI) {
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writel(RTC_BIT_AI, ldata->base + RTC_ICR);
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events |= (RTC_AF | RTC_IRQF);
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rtc_update_irq(ldata->rtc, 1, events);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int pl031_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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rtc_time64_to_tm(readl(ldata->base + RTC_DR), tm);
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return 0;
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}
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static int pl031_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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writel(rtc_tm_to_time64(tm), ldata->base + RTC_LR);
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return 0;
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}
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static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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rtc_time64_to_tm(readl(ldata->base + RTC_MR), &alarm->time);
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alarm->pending = readl(ldata->base + RTC_RIS) & RTC_BIT_AI;
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alarm->enabled = readl(ldata->base + RTC_IMSC) & RTC_BIT_AI;
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return 0;
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}
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static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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writel(rtc_tm_to_time64(&alarm->time), ldata->base + RTC_MR);
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pl031_alarm_irq_enable(dev, alarm->enabled);
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return 0;
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}
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static void pl031_remove(struct amba_device *adev)
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{
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struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
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dev_pm_clear_wake_irq(&adev->dev);
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device_init_wakeup(&adev->dev, false);
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if (adev->irq[0])
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free_irq(adev->irq[0], ldata);
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amba_release_regions(adev);
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}
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static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
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{
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int ret;
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struct pl031_local *ldata;
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struct pl031_vendor_data *vendor = id->data;
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struct rtc_class_ops *ops;
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unsigned long time, data;
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ret = amba_request_regions(adev, NULL);
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if (ret)
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goto err_req;
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ldata = devm_kzalloc(&adev->dev, sizeof(struct pl031_local),
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GFP_KERNEL);
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ops = devm_kmemdup(&adev->dev, &vendor->ops, sizeof(vendor->ops),
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GFP_KERNEL);
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if (!ldata || !ops) {
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ret = -ENOMEM;
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goto out;
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}
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ldata->vendor = vendor;
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ldata->base = devm_ioremap(&adev->dev, adev->res.start,
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resource_size(&adev->res));
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if (!ldata->base) {
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ret = -ENOMEM;
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goto out;
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}
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amba_set_drvdata(adev, ldata);
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dev_dbg(&adev->dev, "designer ID = 0x%02x\n", amba_manf(adev));
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dev_dbg(&adev->dev, "revision = 0x%01x\n", amba_rev(adev));
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data = readl(ldata->base + RTC_CR);
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/* Enable the clockwatch on ST Variants */
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if (vendor->clockwatch)
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data |= RTC_CR_CWEN;
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else
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data |= RTC_CR_EN;
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writel(data, ldata->base + RTC_CR);
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/*
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* On ST PL031 variants, the RTC reset value does not provide correct
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* weekday for 2000-01-01. Correct the erroneous sunday to saturday.
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*/
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if (vendor->st_weekday) {
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if (readl(ldata->base + RTC_YDR) == 0x2000) {
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time = readl(ldata->base + RTC_DR);
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if ((time &
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(RTC_MON_MASK | RTC_MDAY_MASK | RTC_WDAY_MASK))
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== 0x02120000) {
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time = time | (0x7 << RTC_WDAY_SHIFT);
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writel(0x2000, ldata->base + RTC_YLR);
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writel(time, ldata->base + RTC_LR);
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}
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}
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}
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if (!adev->irq[0])
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clear_bit(RTC_FEATURE_ALARM, ldata->rtc->features);
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device_init_wakeup(&adev->dev, true);
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ldata->rtc = devm_rtc_allocate_device(&adev->dev);
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if (IS_ERR(ldata->rtc)) {
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ret = PTR_ERR(ldata->rtc);
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goto out;
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}
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ldata->rtc->ops = ops;
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ldata->rtc->range_min = vendor->range_min;
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ldata->rtc->range_max = vendor->range_max;
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ret = devm_rtc_register_device(ldata->rtc);
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if (ret)
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goto out;
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if (adev->irq[0]) {
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ret = request_irq(adev->irq[0], pl031_interrupt,
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vendor->irqflags, "rtc-pl031", ldata);
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if (ret)
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goto out;
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dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
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}
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return 0;
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out:
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amba_release_regions(adev);
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err_req:
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return ret;
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}
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/* Operations for the original ARM version */
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static struct pl031_vendor_data arm_pl031 = {
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.ops = {
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.read_time = pl031_read_time,
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.set_time = pl031_set_time,
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.read_alarm = pl031_read_alarm,
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.set_alarm = pl031_set_alarm,
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.alarm_irq_enable = pl031_alarm_irq_enable,
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},
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.range_max = U32_MAX,
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};
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/* The First ST derivative */
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static struct pl031_vendor_data stv1_pl031 = {
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.ops = {
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.read_time = pl031_read_time,
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.set_time = pl031_set_time,
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.read_alarm = pl031_read_alarm,
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.set_alarm = pl031_set_alarm,
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.alarm_irq_enable = pl031_alarm_irq_enable,
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},
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.clockwatch = true,
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.st_weekday = true,
|
|
.range_max = U32_MAX,
|
|
};
|
|
|
|
/* And the second ST derivative */
|
|
static struct pl031_vendor_data stv2_pl031 = {
|
|
.ops = {
|
|
.read_time = pl031_stv2_read_time,
|
|
.set_time = pl031_stv2_set_time,
|
|
.read_alarm = pl031_stv2_read_alarm,
|
|
.set_alarm = pl031_stv2_set_alarm,
|
|
.alarm_irq_enable = pl031_alarm_irq_enable,
|
|
},
|
|
.clockwatch = true,
|
|
.st_weekday = true,
|
|
/*
|
|
* This variant shares the IRQ with another block and must not
|
|
* suspend that IRQ line.
|
|
* TODO check if it shares with IRQF_NO_SUSPEND user, else we can
|
|
* remove IRQF_COND_SUSPEND
|
|
*/
|
|
.irqflags = IRQF_SHARED | IRQF_COND_SUSPEND,
|
|
.range_min = RTC_TIMESTAMP_BEGIN_0000,
|
|
.range_max = RTC_TIMESTAMP_END_9999,
|
|
};
|
|
|
|
static const struct amba_id pl031_ids[] = {
|
|
{
|
|
.id = 0x00041031,
|
|
.mask = 0x000fffff,
|
|
.data = &arm_pl031,
|
|
},
|
|
/* ST Micro variants */
|
|
{
|
|
.id = 0x00180031,
|
|
.mask = 0x00ffffff,
|
|
.data = &stv1_pl031,
|
|
},
|
|
{
|
|
.id = 0x00280031,
|
|
.mask = 0x00ffffff,
|
|
.data = &stv2_pl031,
|
|
},
|
|
{0, 0},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(amba, pl031_ids);
|
|
|
|
static struct amba_driver pl031_driver = {
|
|
.drv = {
|
|
.name = "rtc-pl031",
|
|
},
|
|
.id_table = pl031_ids,
|
|
.probe = pl031_probe,
|
|
.remove = pl031_remove,
|
|
};
|
|
|
|
module_amba_driver(pl031_driver);
|
|
|
|
MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
|
|
MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
|
|
MODULE_LICENSE("GPL");
|