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206 lines
4.9 KiB
206 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2000, 2001 Broadcom Corporation |
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* |
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* Copyright (C) 2002 MontaVista Software Inc. |
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* Author: [email protected] or [email protected] |
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*/ |
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#include <linux/bcd.h> |
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#include <linux/types.h> |
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#include <linux/time.h> |
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#include <asm/time.h> |
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#include <asm/addrspace.h> |
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#include <asm/io.h> |
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#include <asm/sibyte/sb1250.h> |
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#include <asm/sibyte/sb1250_regs.h> |
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#include <asm/sibyte/sb1250_smbus.h> |
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/* Xicor 1241 definitions */ |
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/* |
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* Register bits |
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*/ |
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#define X1241REG_SR_BAT 0x80 /* currently on battery power */ |
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#define X1241REG_SR_RWEL 0x04 /* r/w latch is enabled, can write RTC */ |
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#define X1241REG_SR_WEL 0x02 /* r/w latch is unlocked, can enable r/w now */ |
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#define X1241REG_SR_RTCF 0x01 /* clock failed */ |
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#define X1241REG_BL_BP2 0x80 /* block protect 2 */ |
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#define X1241REG_BL_BP1 0x40 /* block protect 1 */ |
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#define X1241REG_BL_BP0 0x20 /* block protect 0 */ |
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#define X1241REG_BL_WD1 0x10 |
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#define X1241REG_BL_WD0 0x08 |
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#define X1241REG_HR_MIL 0x80 /* military time format */ |
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/* |
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* Register numbers |
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*/ |
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#define X1241REG_BL 0x10 /* block protect bits */ |
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#define X1241REG_INT 0x11 /* */ |
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#define X1241REG_SC 0x30 /* Seconds */ |
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#define X1241REG_MN 0x31 /* Minutes */ |
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#define X1241REG_HR 0x32 /* Hours */ |
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#define X1241REG_DT 0x33 /* Day of month */ |
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#define X1241REG_MO 0x34 /* Month */ |
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#define X1241REG_YR 0x35 /* Year */ |
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#define X1241REG_DW 0x36 /* Day of Week */ |
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#define X1241REG_Y2K 0x37 /* Year 2K */ |
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#define X1241REG_SR 0x3F /* Status register */ |
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#define X1241_CCR_ADDRESS 0x6F |
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#define SMB_CSR(reg) IOADDR(A_SMB_REGISTER(1, reg)) |
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static int xicor_read(uint8_t addr) |
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{ |
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while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) |
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; |
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__raw_writeq((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD)); |
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__raw_writeq(addr & 0xff, SMB_CSR(R_SMB_DATA)); |
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__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE, |
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SMB_CSR(R_SMB_START)); |
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while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) |
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; |
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__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE, |
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SMB_CSR(R_SMB_START)); |
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while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) |
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; |
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if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) { |
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/* Clear error bit by writing a 1 */ |
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__raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS)); |
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return -1; |
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} |
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return __raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff; |
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} |
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static int xicor_write(uint8_t addr, int b) |
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{ |
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while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) |
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; |
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__raw_writeq(addr, SMB_CSR(R_SMB_CMD)); |
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__raw_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA)); |
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__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE, |
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SMB_CSR(R_SMB_START)); |
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while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY) |
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; |
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if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) { |
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/* Clear error bit by writing a 1 */ |
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__raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS)); |
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return -1; |
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} else { |
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return 0; |
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} |
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} |
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int xicor_set_time(time64_t t) |
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{ |
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struct rtc_time tm; |
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int tmp; |
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unsigned long flags; |
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rtc_time64_to_tm(t, &tm); |
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tm.tm_year += 1900; |
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spin_lock_irqsave(&rtc_lock, flags); |
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/* unlock writes to the CCR */ |
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xicor_write(X1241REG_SR, X1241REG_SR_WEL); |
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xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL); |
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/* trivial ones */ |
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tm.tm_sec = bin2bcd(tm.tm_sec); |
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xicor_write(X1241REG_SC, tm.tm_sec); |
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tm.tm_min = bin2bcd(tm.tm_min); |
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xicor_write(X1241REG_MN, tm.tm_min); |
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tm.tm_mday = bin2bcd(tm.tm_mday); |
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xicor_write(X1241REG_DT, tm.tm_mday); |
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/* tm_mon starts from 0, *ick* */ |
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tm.tm_mon ++; |
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tm.tm_mon = bin2bcd(tm.tm_mon); |
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xicor_write(X1241REG_MO, tm.tm_mon); |
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/* year is split */ |
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tmp = tm.tm_year / 100; |
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tm.tm_year %= 100; |
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xicor_write(X1241REG_YR, tm.tm_year); |
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xicor_write(X1241REG_Y2K, tmp); |
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/* hour is the most tricky one */ |
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tmp = xicor_read(X1241REG_HR); |
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if (tmp & X1241REG_HR_MIL) { |
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/* 24 hour format */ |
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tm.tm_hour = bin2bcd(tm.tm_hour); |
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tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f); |
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} else { |
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/* 12 hour format, with 0x2 for pm */ |
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tmp = tmp & ~0x3f; |
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if (tm.tm_hour >= 12) { |
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tmp |= 0x20; |
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tm.tm_hour -= 12; |
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} |
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tm.tm_hour = bin2bcd(tm.tm_hour); |
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tmp |= tm.tm_hour; |
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} |
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xicor_write(X1241REG_HR, tmp); |
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xicor_write(X1241REG_SR, 0); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return 0; |
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} |
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time64_t xicor_get_time(void) |
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{ |
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unsigned int year, mon, day, hour, min, sec, y2k; |
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unsigned long flags; |
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spin_lock_irqsave(&rtc_lock, flags); |
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sec = xicor_read(X1241REG_SC); |
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min = xicor_read(X1241REG_MN); |
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hour = xicor_read(X1241REG_HR); |
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if (hour & X1241REG_HR_MIL) { |
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hour &= 0x3f; |
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} else { |
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if (hour & 0x20) |
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hour = (hour & 0xf) + 0x12; |
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} |
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day = xicor_read(X1241REG_DT); |
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mon = xicor_read(X1241REG_MO); |
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year = xicor_read(X1241REG_YR); |
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y2k = xicor_read(X1241REG_Y2K); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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sec = bcd2bin(sec); |
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min = bcd2bin(min); |
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hour = bcd2bin(hour); |
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day = bcd2bin(day); |
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mon = bcd2bin(mon); |
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year = bcd2bin(year); |
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y2k = bcd2bin(y2k); |
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year += (y2k * 100); |
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return mktime64(year, mon, day, hour, min, sec); |
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} |
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int xicor_probe(void) |
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{ |
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return xicor_read(X1241REG_SC) != -1; |
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}
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