[PATCH] powerpc: kill ppc64 rtc.c, use genrtc instead

This moves the rtas RTC callbacks to rtas-rtc.c in arch/powerpc/kernel,
and kills the rest of arch/ppc64/kernel/rtc.c which was just a duplicate
of the genrtc functionality. Also enable build of genrtc for
CONFIG_PPC64 (it just works are we already have the required callbacks)
and enable it in all defconfigs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/rtas-rtc.c b/arch/powerpc/kernel/rtas-rtc.c
new file mode 100644
index 000000000000..7b948662704c
--- /dev/null
+++ b/arch/powerpc/kernel/rtas-rtc.c
@@ -0,0 +1,105 @@
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/time.h>
+
+
+#define MAX_RTC_WAIT 5000       /* 5 sec */
+#define RTAS_CLOCK_BUSY (-2)
+unsigned long __init rtas_get_boot_time(void)
+{
+        int ret[8];
+        int error, wait_time;
+        unsigned long max_wait_tb;
+
+        max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
+        do {
+                error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
+                if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
+                        wait_time = rtas_extended_busy_delay_time(error);
+                        /* This is boot time so we spin. */
+                        udelay(wait_time*1000);
+                        error = RTAS_CLOCK_BUSY;
+                }
+        } while (error == RTAS_CLOCK_BUSY && (get_tb() < max_wait_tb));
+
+        if (error != 0 && printk_ratelimit()) {
+                printk(KERN_WARNING "error: reading the clock failed (%d)\n",
+                        error);
+                return 0;
+        }
+
+        return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
+}
+
+/* NOTE: get_rtc_time will get an error if executed in interrupt context
+ * and if a delay is needed to read the clock.  In this case we just
+ * silently return without updating rtc_tm.
+ */
+void rtas_get_rtc_time(struct rtc_time *rtc_tm)
+{
+        int ret[8];
+        int error, wait_time;
+        unsigned long max_wait_tb;
+
+        max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
+        do {
+                error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
+                if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
+                        if (in_interrupt() && printk_ratelimit()) {
+                                memset(&rtc_tm, 0, sizeof(struct rtc_time));
+                                printk(KERN_WARNING "error: reading clock"
+                                       " would delay interrupt\n");
+                                return; /* delay not allowed */
+                        }
+                        wait_time = rtas_extended_busy_delay_time(error);
+                        msleep(wait_time);
+                        error = RTAS_CLOCK_BUSY;
+                }
+        } while (error == RTAS_CLOCK_BUSY && (get_tb() < max_wait_tb));
+
+        if (error != 0 && printk_ratelimit()) {
+                printk(KERN_WARNING "error: reading the clock failed (%d)\n",
+                       error);
+                return;
+        }
+
+        rtc_tm->tm_sec = ret[5];
+        rtc_tm->tm_min = ret[4];
+        rtc_tm->tm_hour = ret[3];
+        rtc_tm->tm_mday = ret[2];
+        rtc_tm->tm_mon = ret[1] - 1;
+        rtc_tm->tm_year = ret[0] - 1900;
+}
+
+int rtas_set_rtc_time(struct rtc_time *tm)
+{
+        int error, wait_time;
+        unsigned long max_wait_tb;
+
+        max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
+        do {
+                error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
+                                  tm->tm_year + 1900, tm->tm_mon + 1,
+                                  tm->tm_mday, tm->tm_hour, tm->tm_min,
+                                  tm->tm_sec, 0);
+                if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
+                        if (in_interrupt())
+                                return 1;       /* probably decrementer */
+                        wait_time = rtas_extended_busy_delay_time(error);
+                        msleep(wait_time);
+                        error = RTAS_CLOCK_BUSY;
+                }
+        } while (error == RTAS_CLOCK_BUSY && (get_tb() < max_wait_tb));
+
+        if (error != 0 && printk_ratelimit())
+                printk(KERN_WARNING "error: setting the clock failed (%d)\n",
+                       error);
+
+        return 0;
+}