diff options
Diffstat (limited to 'arch/ppc/syslib/todc_time.c')
| -rw-r--r-- | arch/ppc/syslib/todc_time.c | 511 |
1 files changed, 0 insertions, 511 deletions
diff --git a/arch/ppc/syslib/todc_time.c b/arch/ppc/syslib/todc_time.c deleted file mode 100644 index a8168b8..0000000 --- a/arch/ppc/syslib/todc_time.c +++ /dev/null @@ -1,511 +0,0 @@ -/* - * Time of Day Clock support for the M48T35, M48T37, M48T59, and MC146818 - * Real Time Clocks/Timekeepers. - * - * Author: Mark A. Greer - * mgreer@mvista.com - * - * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under - * the terms of the GNU General Public License version 2. This program - * is licensed "as is" without any warranty of any kind, whether express - * or implied. - */ -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/bcd.h> -#include <linux/mc146818rtc.h> - -#include <asm/machdep.h> -#include <asm/io.h> -#include <asm/time.h> -#include <asm/todc.h> - -/* - * Depending on the hardware on your board and your board design, the - * RTC/NVRAM may be accessed either directly (like normal memory) or via - * address/data registers. If your board uses the direct method, set - * 'nvram_data' to the base address of your nvram and leave 'nvram_as0' and - * 'nvram_as1' NULL. If your board uses address/data regs to access nvram, - * set 'nvram_as0' to the address of the lower byte, set 'nvram_as1' to the - * address of the upper byte (leave NULL if using mc146818), and set - * 'nvram_data' to the address of the 8-bit data register. - * - * In order to break the assumption that the RTC and NVRAM are accessed by - * the same mechanism, you need to explicitly set 'ppc_md.rtc_read_val' and - * 'ppc_md.rtc_write_val', otherwise the values of 'ppc_md.rtc_read_val' - * and 'ppc_md.rtc_write_val' will be used. - * - * Note: Even though the documentation for the various RTC chips say that it - * take up to a second before it starts updating once the 'R' bit is - * cleared, they always seem to update even though we bang on it many - * times a second. This is true, except for the Dallas Semi 1746/1747 - * (possibly others). Those chips seem to have a real problem whenever - * we set the 'R' bit before reading them, they basically stop counting. - * --MAG - */ - -/* - * 'todc_info' should be initialized in your *_setup.c file to - * point to a fully initialized 'todc_info_t' structure. - * This structure holds all the register offsets for your particular - * TODC/RTC chip. - * TODC_ALLOC()/TODC_INIT() will allocate and initialize this table for you. - */ - -#ifdef RTC_FREQ_SELECT -#undef RTC_FREQ_SELECT -#define RTC_FREQ_SELECT control_b /* Register A */ -#endif - -#ifdef RTC_CONTROL -#undef RTC_CONTROL -#define RTC_CONTROL control_a /* Register B */ -#endif - -#ifdef RTC_INTR_FLAGS -#undef RTC_INTR_FLAGS -#define RTC_INTR_FLAGS watchdog /* Register C */ -#endif - -#ifdef RTC_VALID -#undef RTC_VALID -#define RTC_VALID interrupts /* Register D */ -#endif - -/* Access routines when RTC accessed directly (like normal memory) */ -u_char -todc_direct_read_val(int addr) -{ - return readb((void __iomem *)(todc_info->nvram_data + addr)); -} - -void -todc_direct_write_val(int addr, unsigned char val) -{ - writeb(val, (void __iomem *)(todc_info->nvram_data + addr)); - return; -} - -/* Access routines for accessing m48txx type chips via addr/data regs */ -u_char -todc_m48txx_read_val(int addr) -{ - outb(addr, todc_info->nvram_as0); - outb(addr>>todc_info->as0_bits, todc_info->nvram_as1); - return inb(todc_info->nvram_data); -} - -void -todc_m48txx_write_val(int addr, unsigned char val) -{ - outb(addr, todc_info->nvram_as0); - outb(addr>>todc_info->as0_bits, todc_info->nvram_as1); - outb(val, todc_info->nvram_data); - return; -} - -/* Access routines for accessing mc146818 type chips via addr/data regs */ -u_char -todc_mc146818_read_val(int addr) -{ - outb_p(addr, todc_info->nvram_as0); - return inb_p(todc_info->nvram_data); -} - -void -todc_mc146818_write_val(int addr, unsigned char val) -{ - outb_p(addr, todc_info->nvram_as0); - outb_p(val, todc_info->nvram_data); -} - - -/* - * Routines to make RTC chips with NVRAM buried behind an addr/data pair - * have the NVRAM and clock regs appear at the same level. - * The NVRAM will appear to start at addr 0 and the clock regs will appear - * to start immediately after the NVRAM (actually, start at offset - * todc_info->nvram_size). - */ -static inline u_char -todc_read_val(int addr) -{ - u_char val; - - if (todc_info->sw_flags & TODC_FLAG_2_LEVEL_NVRAM) { - if (addr < todc_info->nvram_size) { /* NVRAM */ - ppc_md.rtc_write_val(todc_info->nvram_addr_reg, addr); - val = ppc_md.rtc_read_val(todc_info->nvram_data_reg); - } - else { /* Clock Reg */ - addr -= todc_info->nvram_size; - val = ppc_md.rtc_read_val(addr); - } - } - else { - val = ppc_md.rtc_read_val(addr); - } - - return val; -} - -static inline void -todc_write_val(int addr, u_char val) -{ - if (todc_info->sw_flags & TODC_FLAG_2_LEVEL_NVRAM) { - if (addr < todc_info->nvram_size) { /* NVRAM */ - ppc_md.rtc_write_val(todc_info->nvram_addr_reg, addr); - ppc_md.rtc_write_val(todc_info->nvram_data_reg, val); - } - else { /* Clock Reg */ - addr -= todc_info->nvram_size; - ppc_md.rtc_write_val(addr, val); - } - } - else { - ppc_md.rtc_write_val(addr, val); - } -} - -/* - * TODC routines - * - * There is some ugly stuff in that there are assumptions for the mc146818. - * - * Assumptions: - * - todc_info->control_a has the offset as mc146818 Register B reg - * - todc_info->control_b has the offset as mc146818 Register A reg - * - m48txx control reg's write enable or 'W' bit is same as - * mc146818 Register B 'SET' bit (i.e., 0x80) - * - * These assumptions were made to make the code simpler. - */ -long __init -todc_time_init(void) -{ - u_char cntl_b; - - if (!ppc_md.rtc_read_val) - ppc_md.rtc_read_val = ppc_md.nvram_read_val; - if (!ppc_md.rtc_write_val) - ppc_md.rtc_write_val = ppc_md.nvram_write_val; - - cntl_b = todc_read_val(todc_info->control_b); - - if (todc_info->rtc_type == TODC_TYPE_MC146818) { - if ((cntl_b & 0x70) != 0x20) { - printk(KERN_INFO "TODC %s %s\n", - "real-time-clock was stopped.", - "Now starting..."); - cntl_b &= ~0x70; - cntl_b |= 0x20; - } - - todc_write_val(todc_info->control_b, cntl_b); - } else if (todc_info->rtc_type == TODC_TYPE_DS17285) { - u_char mode; - - mode = todc_read_val(TODC_TYPE_DS17285_CNTL_A); - /* Make sure countdown clear is not set */ - mode &= ~0x40; - /* Enable oscillator, extended register set */ - mode |= 0x30; - todc_write_val(TODC_TYPE_DS17285_CNTL_A, mode); - - } else if (todc_info->rtc_type == TODC_TYPE_DS1501) { - u_char month; - - todc_info->enable_read = TODC_DS1501_CNTL_B_TE; - todc_info->enable_write = TODC_DS1501_CNTL_B_TE; - - month = todc_read_val(todc_info->month); - - if ((month & 0x80) == 0x80) { - printk(KERN_INFO "TODC %s %s\n", - "real-time-clock was stopped.", - "Now starting..."); - month &= ~0x80; - todc_write_val(todc_info->month, month); - } - - cntl_b &= ~TODC_DS1501_CNTL_B_TE; - todc_write_val(todc_info->control_b, cntl_b); - } else { /* must be a m48txx type */ - u_char cntl_a; - - todc_info->enable_read = TODC_MK48TXX_CNTL_A_R; - todc_info->enable_write = TODC_MK48TXX_CNTL_A_W; - - cntl_a = todc_read_val(todc_info->control_a); - - /* Check & clear STOP bit in control B register */ - if (cntl_b & TODC_MK48TXX_DAY_CB) { - printk(KERN_INFO "TODC %s %s\n", - "real-time-clock was stopped.", - "Now starting..."); - - cntl_a |= todc_info->enable_write; - cntl_b &= ~TODC_MK48TXX_DAY_CB;/* Start Oscil */ - - todc_write_val(todc_info->control_a, cntl_a); - todc_write_val(todc_info->control_b, cntl_b); - } - - /* Make sure READ & WRITE bits are cleared. */ - cntl_a &= ~(todc_info->enable_write | - todc_info->enable_read); - todc_write_val(todc_info->control_a, cntl_a); - } - - return 0; -} - -/* - * There is some ugly stuff in that there are assumptions that for a mc146818, - * the todc_info->control_a has the offset of the mc146818 Register B reg and - * that the register'ss 'SET' bit is the same as the m48txx's write enable - * bit in the control register of the m48txx (i.e., 0x80). - * - * It was done to make the code look simpler. - */ -ulong -todc_get_rtc_time(void) -{ - uint year = 0, mon = 0, day = 0, hour = 0, min = 0, sec = 0; - uint limit, i; - u_char save_control, uip = 0; - - spin_lock(&rtc_lock); - save_control = todc_read_val(todc_info->control_a); - - if (todc_info->rtc_type != TODC_TYPE_MC146818) { - limit = 1; - - switch (todc_info->rtc_type) { - case TODC_TYPE_DS1553: - case TODC_TYPE_DS1557: - case TODC_TYPE_DS1743: - case TODC_TYPE_DS1746: /* XXXX BAD HACK -> FIX */ - case TODC_TYPE_DS1747: - case TODC_TYPE_DS17285: - break; - default: - todc_write_val(todc_info->control_a, - (save_control | todc_info->enable_read)); - } - } - else { - limit = 100000000; - } - - for (i=0; i<limit; i++) { - if (todc_info->rtc_type == TODC_TYPE_MC146818) { - uip = todc_read_val(todc_info->RTC_FREQ_SELECT); - } - - sec = todc_read_val(todc_info->seconds) & 0x7f; - min = todc_read_val(todc_info->minutes) & 0x7f; - hour = todc_read_val(todc_info->hours) & 0x3f; - day = todc_read_val(todc_info->day_of_month) & 0x3f; - mon = todc_read_val(todc_info->month) & 0x1f; - year = todc_read_val(todc_info->year) & 0xff; - - if (todc_info->rtc_type == TODC_TYPE_MC146818) { - uip |= todc_read_val(todc_info->RTC_FREQ_SELECT); - if ((uip & RTC_UIP) == 0) break; - } - } - - if (todc_info->rtc_type != TODC_TYPE_MC146818) { - switch (todc_info->rtc_type) { - case TODC_TYPE_DS1553: - case TODC_TYPE_DS1557: - case TODC_TYPE_DS1743: - case TODC_TYPE_DS1746: /* XXXX BAD HACK -> FIX */ - case TODC_TYPE_DS1747: - case TODC_TYPE_DS17285: - break; - default: - save_control &= ~(todc_info->enable_read); - todc_write_val(todc_info->control_a, - save_control); - } - } - spin_unlock(&rtc_lock); - - if ((todc_info->rtc_type != TODC_TYPE_MC146818) || - ((save_control & RTC_DM_BINARY) == 0) || - RTC_ALWAYS_BCD) { - - BCD_TO_BIN(sec); - BCD_TO_BIN(min); - BCD_TO_BIN(hour); - BCD_TO_BIN(day); - BCD_TO_BIN(mon); - BCD_TO_BIN(year); - } - - year = year + 1900; - if (year < 1970) { - year += 100; - } - - return mktime(year, mon, day, hour, min, sec); -} - -int -todc_set_rtc_time(unsigned long nowtime) -{ - struct rtc_time tm; - u_char save_control, save_freq_select = 0; - - spin_lock(&rtc_lock); - to_tm(nowtime, &tm); - - save_control = todc_read_val(todc_info->control_a); - - /* Assuming MK48T59_RTC_CA_WRITE & RTC_SET are equal */ - todc_write_val(todc_info->control_a, - (save_control | todc_info->enable_write)); - save_control &= ~(todc_info->enable_write); /* in case it was set */ - - if (todc_info->rtc_type == TODC_TYPE_MC146818) { - save_freq_select = todc_read_val(todc_info->RTC_FREQ_SELECT); - todc_write_val(todc_info->RTC_FREQ_SELECT, - save_freq_select | RTC_DIV_RESET2); - } - - - tm.tm_year = (tm.tm_year - 1900) % 100; - - if ((todc_info->rtc_type != TODC_TYPE_MC146818) || - ((save_control & RTC_DM_BINARY) == 0) || - RTC_ALWAYS_BCD) { - - BIN_TO_BCD(tm.tm_sec); - BIN_TO_BCD(tm.tm_min); - BIN_TO_BCD(tm.tm_hour); - BIN_TO_BCD(tm.tm_mon); - BIN_TO_BCD(tm.tm_mday); - BIN_TO_BCD(tm.tm_year); - } - - todc_write_val(todc_info->seconds, tm.tm_sec); - todc_write_val(todc_info->minutes, tm.tm_min); - todc_write_val(todc_info->hours, tm.tm_hour); - todc_write_val(todc_info->month, tm.tm_mon); - todc_write_val(todc_info->day_of_month, tm.tm_mday); - todc_write_val(todc_info->year, tm.tm_year); - - todc_write_val(todc_info->control_a, save_control); - - if (todc_info->rtc_type == TODC_TYPE_MC146818) { - todc_write_val(todc_info->RTC_FREQ_SELECT, save_freq_select); - } - spin_unlock(&rtc_lock); - - return 0; -} - -/* - * Manipulates read bit to reliably read seconds at a high rate. - */ -static unsigned char __init todc_read_timereg(int addr) -{ - unsigned char save_control = 0, val; - - switch (todc_info->rtc_type) { - case TODC_TYPE_DS1553: - case TODC_TYPE_DS1557: - case TODC_TYPE_DS1746: /* XXXX BAD HACK -> FIX */ - case TODC_TYPE_DS1747: - case TODC_TYPE_DS17285: - case TODC_TYPE_MC146818: - break; - default: - save_control = todc_read_val(todc_info->control_a); - todc_write_val(todc_info->control_a, - (save_control | todc_info->enable_read)); - } - val = todc_read_val(addr); - - switch (todc_info->rtc_type) { - case TODC_TYPE_DS1553: - case TODC_TYPE_DS1557: - case TODC_TYPE_DS1746: /* XXXX BAD HACK -> FIX */ - case TODC_TYPE_DS1747: - case TODC_TYPE_DS17285: - case TODC_TYPE_MC146818: - break; - default: - save_control &= ~(todc_info->enable_read); - todc_write_val(todc_info->control_a, save_control); - } - - return val; -} - -/* - * This was taken from prep_setup.c - * Use the NVRAM RTC to time a second to calibrate the decrementer. - */ -void __init -todc_calibrate_decr(void) -{ - ulong freq; - ulong tbl, tbu; - long i, loop_count; - u_char sec; - - todc_time_init(); - - /* - * Actually this is bad for precision, we should have a loop in - * which we only read the seconds counter. todc_read_val writes - * the address bytes on every call and this takes a lot of time. - * Perhaps an nvram_wait_change method returning a time - * stamp with a loop count as parameter would be the solution. - */ - /* - * Need to make sure the tbl doesn't roll over so if tbu increments - * during this test, we need to do it again. - */ - loop_count = 0; - - sec = todc_read_timereg(todc_info->seconds) & 0x7f; - - do { - tbu = get_tbu(); - - for (i = 0 ; i < 10000000 ; i++) {/* may take up to 1 second */ - tbl = get_tbl(); - - if ((todc_read_timereg(todc_info->seconds) & 0x7f) != sec) { - break; - } - } - - sec = todc_read_timereg(todc_info->seconds) & 0x7f; - - for (i = 0 ; i < 10000000 ; i++) { /* Should take 1 second */ - freq = get_tbl(); - - if ((todc_read_timereg(todc_info->seconds) & 0x7f) != sec) { - break; - } - } - - freq -= tbl; - } while ((get_tbu() != tbu) && (++loop_count < 2)); - - printk("time_init: decrementer frequency = %lu.%.6lu MHz\n", - freq/1000000, freq%1000000); - - tb_ticks_per_jiffy = freq / HZ; - tb_to_us = mulhwu_scale_factor(freq, 1000000); - - return; -} |
