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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/mips/sibyte/swarm/rtc_xicor1241.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/sibyte/swarm/rtc_xicor1241.c')
-rw-r--r-- | arch/mips/sibyte/swarm/rtc_xicor1241.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/mips/sibyte/swarm/rtc_xicor1241.c b/arch/mips/sibyte/swarm/rtc_xicor1241.c new file mode 100644 index 000000000..e2164200c --- /dev/null +++ b/arch/mips/sibyte/swarm/rtc_xicor1241.c @@ -0,0 +1,206 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2000, 2001 Broadcom Corporation + * + * Copyright (C) 2002 MontaVista Software Inc. + * Author: jsun@mvista.com or jsun@junsun.net + */ +#include <linux/bcd.h> +#include <linux/types.h> +#include <linux/time.h> + +#include <asm/time.h> +#include <asm/addrspace.h> +#include <asm/io.h> + +#include <asm/sibyte/sb1250.h> +#include <asm/sibyte/sb1250_regs.h> +#include <asm/sibyte/sb1250_smbus.h> + + +/* Xicor 1241 definitions */ + +/* + * Register bits + */ + +#define X1241REG_SR_BAT 0x80 /* currently on battery power */ +#define X1241REG_SR_RWEL 0x04 /* r/w latch is enabled, can write RTC */ +#define X1241REG_SR_WEL 0x02 /* r/w latch is unlocked, can enable r/w now */ +#define X1241REG_SR_RTCF 0x01 /* clock failed */ +#define X1241REG_BL_BP2 0x80 /* block protect 2 */ +#define X1241REG_BL_BP1 0x40 /* block protect 1 */ +#define X1241REG_BL_BP0 0x20 /* block protect 0 */ +#define X1241REG_BL_WD1 0x10 +#define X1241REG_BL_WD0 0x08 +#define X1241REG_HR_MIL 0x80 /* military time format */ + +/* + * Register numbers + */ + +#define X1241REG_BL 0x10 /* block protect bits */ +#define X1241REG_INT 0x11 /* */ +#define X1241REG_SC 0x30 /* Seconds */ +#define X1241REG_MN 0x31 /* Minutes */ +#define X1241REG_HR 0x32 /* Hours */ +#define X1241REG_DT 0x33 /* Day of month */ +#define X1241REG_MO 0x34 /* Month */ +#define X1241REG_YR 0x35 /* Year */ +#define X1241REG_DW 0x36 /* Day of Week */ +#define X1241REG_Y2K 0x37 /* Year 2K */ +#define X1241REG_SR 0x3F /* Status register */ + +#define X1241_CCR_ADDRESS 0x6F + +#define SMB_CSR(reg) IOADDR(A_SMB_REGISTER(1, reg)) + +static int xicor_read(uint8_t addr) +{ + while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) + ; + + __raw_writeq((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD)); + __raw_writeq(addr & 0xff, SMB_CSR(R_SMB_DATA)); + __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE, + SMB_CSR(R_SMB_START)); + + while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) + ; + + __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE, + SMB_CSR(R_SMB_START)); + + while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) + ; + + if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) { + /* Clear error bit by writing a 1 */ + __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS)); + return -1; + } + + return __raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff; +} + +static int xicor_write(uint8_t addr, int b) +{ + while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) + ; + + __raw_writeq(addr, SMB_CSR(R_SMB_CMD)); + __raw_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA)); + __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE, + SMB_CSR(R_SMB_START)); + + while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) + ; + + if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) { + /* Clear error bit by writing a 1 */ + __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS)); + return -1; + } else { + return 0; + } +} + +int xicor_set_time(time64_t t) +{ + struct rtc_time tm; + int tmp; + unsigned long flags; + + rtc_time64_to_tm(t, &tm); + tm.tm_year += 1900; + + spin_lock_irqsave(&rtc_lock, flags); + /* unlock writes to the CCR */ + xicor_write(X1241REG_SR, X1241REG_SR_WEL); + xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL); + + /* trivial ones */ + tm.tm_sec = bin2bcd(tm.tm_sec); + xicor_write(X1241REG_SC, tm.tm_sec); + + tm.tm_min = bin2bcd(tm.tm_min); + xicor_write(X1241REG_MN, tm.tm_min); + + tm.tm_mday = bin2bcd(tm.tm_mday); + xicor_write(X1241REG_DT, tm.tm_mday); + + /* tm_mon starts from 0, *ick* */ + tm.tm_mon ++; + tm.tm_mon = bin2bcd(tm.tm_mon); + xicor_write(X1241REG_MO, tm.tm_mon); + + /* year is split */ + tmp = tm.tm_year / 100; + tm.tm_year %= 100; + xicor_write(X1241REG_YR, tm.tm_year); + xicor_write(X1241REG_Y2K, tmp); + + /* hour is the most tricky one */ + tmp = xicor_read(X1241REG_HR); + if (tmp & X1241REG_HR_MIL) { + /* 24 hour format */ + tm.tm_hour = bin2bcd(tm.tm_hour); + tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f); + } else { + /* 12 hour format, with 0x2 for pm */ + tmp = tmp & ~0x3f; + if (tm.tm_hour >= 12) { + tmp |= 0x20; + tm.tm_hour -= 12; + } + tm.tm_hour = bin2bcd(tm.tm_hour); + tmp |= tm.tm_hour; + } + xicor_write(X1241REG_HR, tmp); + + xicor_write(X1241REG_SR, 0); + spin_unlock_irqrestore(&rtc_lock, flags); + + return 0; +} + +time64_t xicor_get_time(void) +{ + unsigned int year, mon, day, hour, min, sec, y2k; + unsigned long flags; + + spin_lock_irqsave(&rtc_lock, flags); + sec = xicor_read(X1241REG_SC); + min = xicor_read(X1241REG_MN); + hour = xicor_read(X1241REG_HR); + + if (hour & X1241REG_HR_MIL) { + hour &= 0x3f; + } else { + if (hour & 0x20) + hour = (hour & 0xf) + 0x12; + } + + day = xicor_read(X1241REG_DT); + mon = xicor_read(X1241REG_MO); + year = xicor_read(X1241REG_YR); + y2k = xicor_read(X1241REG_Y2K); + spin_unlock_irqrestore(&rtc_lock, flags); + + sec = bcd2bin(sec); + min = bcd2bin(min); + hour = bcd2bin(hour); + day = bcd2bin(day); + mon = bcd2bin(mon); + year = bcd2bin(year); + y2k = bcd2bin(y2k); + + year += (y2k * 100); + + return mktime64(year, mon, day, hour, min, sec); +} + +int xicor_probe(void) +{ + return xicor_read(X1241REG_SC) != -1; +} |