Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 513 insertions, 0 deletions

diff --git a/arch/ppc/syslib/todc_time.c b/arch/ppc/syslib/todc_time.c
new file mode 100644
index 000000000000..1323c641c19d
--- /dev/null
+++ b/arch/ppc/syslib/todc_time.c
@@ -0,0 +1,513 @@
+/*
+ * arch/ppc/syslib/todc_time.c
+ *
+ * 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;
+}