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Diffstat (limited to 'arch/mips/lasat/ds1603.c')
-rw-r--r--arch/mips/lasat/ds1603.c190
1 files changed, 0 insertions, 190 deletions
diff --git a/arch/mips/lasat/ds1603.c b/arch/mips/lasat/ds1603.c
deleted file mode 100644
index e6ce39fefa78..000000000000
--- a/arch/mips/lasat/ds1603.c
+++ /dev/null
@@ -1,190 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Dallas Semiconductors 1603 RTC driver
- *
- * Brian Murphy <brian@murphy.dk>
- *
- */
-#include <linux/kernel.h>
-#include <asm/lasat/lasat.h>
-#include <linux/delay.h>
-#include <asm/lasat/ds1603.h>
-#include <asm/time.h>
-
-#include "ds1603.h"
-
-#define READ_TIME_CMD 0x81
-#define SET_TIME_CMD 0x80
-#define TRIMMER_SET_CMD 0xC0
-#define TRIMMER_VALUE_MASK 0x38
-#define TRIMMER_SHIFT 3
-
-struct ds_defs *ds1603;
-
-/* HW specific register functions */
-static void rtc_reg_write(unsigned long val)
-{
- *ds1603->reg = val;
-}
-
-static unsigned long rtc_reg_read(void)
-{
- unsigned long tmp = *ds1603->reg;
- return tmp;
-}
-
-static unsigned long rtc_datareg_read(void)
-{
- unsigned long tmp = *ds1603->data_reg;
- return tmp;
-}
-
-static void rtc_nrst_high(void)
-{
- rtc_reg_write(rtc_reg_read() | ds1603->rst);
-}
-
-static void rtc_nrst_low(void)
-{
- rtc_reg_write(rtc_reg_read() & ~ds1603->rst);
-}
-
-static void rtc_cycle_clock(unsigned long data)
-{
- data |= ds1603->clk;
- rtc_reg_write(data);
- lasat_ndelay(250);
- if (ds1603->data_reversed)
- data &= ~ds1603->data;
- else
- data |= ds1603->data;
- data &= ~ds1603->clk;
- rtc_reg_write(data);
- lasat_ndelay(250 + ds1603->huge_delay);
-}
-
-static void rtc_write_databit(unsigned int bit)
-{
- unsigned long data = rtc_reg_read();
- if (ds1603->data_reversed)
- bit = !bit;
- if (bit)
- data |= ds1603->data;
- else
- data &= ~ds1603->data;
-
- rtc_reg_write(data);
- lasat_ndelay(50 + ds1603->huge_delay);
- rtc_cycle_clock(data);
-}
-
-static unsigned int rtc_read_databit(void)
-{
- unsigned int data;
-
- data = (rtc_datareg_read() & (1 << ds1603->data_read_shift))
- >> ds1603->data_read_shift;
- rtc_cycle_clock(rtc_reg_read());
- return data;
-}
-
-static void rtc_write_byte(unsigned int byte)
-{
- int i;
-
- for (i = 0; i <= 7; i++) {
- rtc_write_databit(byte & 1L);
- byte >>= 1;
- }
-}
-
-static void rtc_write_word(unsigned long word)
-{
- int i;
-
- for (i = 0; i <= 31; i++) {
- rtc_write_databit(word & 1L);
- word >>= 1;
- }
-}
-
-static unsigned long rtc_read_word(void)
-{
- int i;
- unsigned long word = 0;
- unsigned long shift = 0;
-
- for (i = 0; i <= 31; i++) {
- word |= rtc_read_databit() << shift;
- shift++;
- }
- return word;
-}
-
-static void rtc_init_op(void)
-{
- rtc_nrst_high();
-
- rtc_reg_write(rtc_reg_read() & ~ds1603->clk);
-
- lasat_ndelay(50);
-}
-
-static void rtc_end_op(void)
-{
- rtc_nrst_low();
- lasat_ndelay(1000);
-}
-
-void read_persistent_clock64(struct timespec64 *ts)
-{
- unsigned long word;
- unsigned long flags;
-
- spin_lock_irqsave(&rtc_lock, flags);
- rtc_init_op();
- rtc_write_byte(READ_TIME_CMD);
- word = rtc_read_word();
- rtc_end_op();
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- ts->tv_sec = word;
- ts->tv_nsec = 0;
-}
-
-int update_persistent_clock64(struct timespec64 now)
-{
- time64_t time = now.tv_sec;
- unsigned long flags;
-
- spin_lock_irqsave(&rtc_lock, flags);
- rtc_init_op();
- rtc_write_byte(SET_TIME_CMD);
- /*
- * Due to the hardware limitation, we cast to 'unsigned long' type,
- * so it will overflow in year 2106 on 32-bit machine.
- */
- rtc_write_word((unsigned long)time);
- rtc_end_op();
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- return 0;
-}
-
-void ds1603_set_trimmer(unsigned int trimval)
-{
- rtc_init_op();
- rtc_write_byte(((trimval << TRIMMER_SHIFT) & TRIMMER_VALUE_MASK)
- | (TRIMMER_SET_CMD));
- rtc_end_op();
-}
-
-void ds1603_disable(void)
-{
- ds1603_set_trimmer(TRIMMER_DISABLE_RTC);
-}
-
-void ds1603_enable(void)
-{
- ds1603_set_trimmer(TRIMMER_DEFAULT);
-}