[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>

4 files changed, 238 insertions, 77 deletions

diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig
index 9f09dff9e11a..913962c1dae0 100644
--- a/arch/powerpc/configs/pseries_defconfig
+++ b/arch/powerpc/configs/pseries_defconfig
@@ -1,18 +1,33 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.14-rc4
-# Thu Oct 20 08:32:17 2005
+# Linux kernel version: 2.6.15-rc1
+# Mon Nov 14 15:27:00 2005
 #
+CONFIG_PPC64=y
 CONFIG_64BIT=y
+CONFIG_PPC_MERGE=y
 CONFIG_MMU=y
+CONFIG_GENERIC_HARDIRQS=y
 CONFIG_RWSEM_XCHGADD_ALGORITHM=y
 CONFIG_GENERIC_CALIBRATE_DELAY=y
-CONFIG_GENERIC_ISA_DMA=y
+CONFIG_PPC=y
 CONFIG_EARLY_PRINTK=y
 CONFIG_COMPAT=y
+CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
 CONFIG_ARCH_MAY_HAVE_PC_FDC=y
-CONFIG_FORCE_MAX_ZONEORDER=13
+
+#
+# Processor support
+#
+# CONFIG_POWER4_ONLY is not set
+CONFIG_POWER3=y
+CONFIG_POWER4=y
+CONFIG_PPC_FPU=y
+CONFIG_ALTIVEC=y
+CONFIG_PPC_STD_MMU=y
+CONFIG_SMP=y
+CONFIG_NR_CPUS=128
 
 #
 # Code maturity level options
@@ -68,75 +83,103 @@ CONFIG_MODVERSIONS=y
 CONFIG_MODULE_SRCVERSION_ALL=y
 CONFIG_KMOD=y
 CONFIG_STOP_MACHINE=y
-CONFIG_SYSVIPC_COMPAT=y
+
+#
+# Block layer
+#
+
+#
+# IO Schedulers
+#
+CONFIG_IOSCHED_NOOP=y
+CONFIG_IOSCHED_AS=y
+CONFIG_IOSCHED_DEADLINE=y
+CONFIG_IOSCHED_CFQ=y
+CONFIG_DEFAULT_AS=y
+# CONFIG_DEFAULT_DEADLINE is not set
+# CONFIG_DEFAULT_CFQ is not set
+# CONFIG_DEFAULT_NOOP is not set
+CONFIG_DEFAULT_IOSCHED="anticipatory"
 
 #
 # Platform support
 #
-# CONFIG_PPC_ISERIES is not set
 CONFIG_PPC_MULTIPLATFORM=y
+# CONFIG_PPC_ISERIES is not set
+# CONFIG_EMBEDDED6xx is not set
+# CONFIG_APUS is not set
 CONFIG_PPC_PSERIES=y
-# CONFIG_PPC_BPA is not set
 # CONFIG_PPC_PMAC is not set
 # CONFIG_PPC_MAPLE is not set
-CONFIG_PPC=y
-CONFIG_PPC64=y
+# CONFIG_PPC_CELL is not set
 CONFIG_PPC_OF=y
 CONFIG_XICS=y
+# CONFIG_U3_DART is not set
 CONFIG_MPIC=y
-CONFIG_ALTIVEC=y
-CONFIG_PPC_SPLPAR=y
-CONFIG_KEXEC=y
+CONFIG_PPC_RTAS=y
+CONFIG_RTAS_ERROR_LOGGING=y
+CONFIG_RTAS_PROC=y
+CONFIG_RTAS_FLASH=m
+# CONFIG_MMIO_NVRAM is not set
 CONFIG_IBMVIO=y
-# CONFIG_U3_DART is not set
-# CONFIG_BOOTX_TEXT is not set
-# CONFIG_POWER4_ONLY is not set
+# CONFIG_PPC_MPC106 is not set
+# CONFIG_GENERIC_TBSYNC is not set
+# CONFIG_CPU_FREQ is not set
+# CONFIG_WANT_EARLY_SERIAL is not set
+
+#
+# Kernel options
+#
+# CONFIG_HZ_100 is not set
+CONFIG_HZ_250=y
+# CONFIG_HZ_1000 is not set
+CONFIG_HZ=250
+CONFIG_PREEMPT_NONE=y
+# CONFIG_PREEMPT_VOLUNTARY is not set
+# CONFIG_PREEMPT is not set
+# CONFIG_PREEMPT_BKL is not set
+CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_MISC is not set
+CONFIG_FORCE_MAX_ZONEORDER=13
 CONFIG_IOMMU_VMERGE=y
-CONFIG_SMP=y
-CONFIG_NR_CPUS=128
+CONFIG_HOTPLUG_CPU=y
+CONFIG_KEXEC=y
+# CONFIG_IRQ_ALL_CPUS is not set
+CONFIG_PPC_SPLPAR=y
+CONFIG_EEH=y
+CONFIG_SCANLOG=m
+CONFIG_LPARCFG=y
+CONFIG_NUMA=y
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
-CONFIG_ARCH_FLATMEM_ENABLE=y
-CONFIG_ARCH_DISCONTIGMEM_ENABLE=y
-CONFIG_ARCH_DISCONTIGMEM_DEFAULT=y
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
+CONFIG_ARCH_SPARSEMEM_DEFAULT=y
 CONFIG_SELECT_MEMORY_MODEL=y
 # CONFIG_FLATMEM_MANUAL is not set
-CONFIG_DISCONTIGMEM_MANUAL=y
-# CONFIG_SPARSEMEM_MANUAL is not set
-CONFIG_DISCONTIGMEM=y
-CONFIG_FLAT_NODE_MEM_MAP=y
+# CONFIG_DISCONTIGMEM_MANUAL is not set
+CONFIG_SPARSEMEM_MANUAL=y
+CONFIG_SPARSEMEM=y
 CONFIG_NEED_MULTIPLE_NODES=y
+CONFIG_HAVE_MEMORY_PRESENT=y
 # CONFIG_SPARSEMEM_STATIC is not set
+CONFIG_SPARSEMEM_EXTREME=y
+# CONFIG_MEMORY_HOTPLUG is not set
+CONFIG_SPLIT_PTLOCK_CPUS=4096
 CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID=y
 CONFIG_NODES_SPAN_OTHER_NODES=y
-CONFIG_NUMA=y
+# CONFIG_PPC_64K_PAGES is not set
 CONFIG_SCHED_SMT=y
-CONFIG_PREEMPT_NONE=y
-# CONFIG_PREEMPT_VOLUNTARY is not set
-# CONFIG_PREEMPT is not set
-# CONFIG_PREEMPT_BKL is not set
-# CONFIG_HZ_100 is not set
-CONFIG_HZ_250=y
-# CONFIG_HZ_1000 is not set
-CONFIG_HZ=250
-CONFIG_EEH=y
-CONFIG_GENERIC_HARDIRQS=y
-CONFIG_PPC_RTAS=y
-CONFIG_RTAS_PROC=y
-CONFIG_RTAS_FLASH=m
-CONFIG_SCANLOG=m
-CONFIG_LPARCFG=y
-CONFIG_SECCOMP=y
-CONFIG_BINFMT_ELF=y
-# CONFIG_BINFMT_MISC is not set
-CONFIG_HOTPLUG_CPU=y
 CONFIG_PROC_DEVICETREE=y
 # CONFIG_CMDLINE_BOOL is not set
+# CONFIG_PM is not set
+CONFIG_SECCOMP=y
 CONFIG_ISA_DMA_API=y
 
 #
-# Bus Options
+# Bus options
 #
+CONFIG_GENERIC_ISA_DMA=y
+CONFIG_PPC_I8259=y
+# CONFIG_PPC_INDIRECT_PCI is not set
 CONFIG_PCI=y
 CONFIG_PCI_DOMAINS=y
 CONFIG_PCI_LEGACY_PROC=y
@@ -156,6 +199,7 @@ CONFIG_HOTPLUG_PCI=m
 # CONFIG_HOTPLUG_PCI_SHPC is not set
 CONFIG_HOTPLUG_PCI_RPA=m
 CONFIG_HOTPLUG_PCI_RPA_DLPAR=m
+CONFIG_KERNEL_START=0xc000000000000000
 
 #
 # Networking
@@ -197,6 +241,10 @@ CONFIG_TCP_CONG_BIC=y
 # CONFIG_IPV6 is not set
 CONFIG_NETFILTER=y
 # CONFIG_NETFILTER_DEBUG is not set
+
+#
+# Core Netfilter Configuration
+#
 CONFIG_NETFILTER_NETLINK=y
 CONFIG_NETFILTER_NETLINK_QUEUE=m
 CONFIG_NETFILTER_NETLINK_LOG=m
@@ -299,6 +347,10 @@ CONFIG_LLC=y
 # CONFIG_NET_DIVERT is not set
 # CONFIG_ECONET is not set
 # CONFIG_WAN_ROUTER is not set
+
+#
+# QoS and/or fair queueing
+#
 # CONFIG_NET_SCHED is not set
 CONFIG_NET_CLS_ROUTE=y
 
@@ -368,14 +420,6 @@ CONFIG_BLK_DEV_RAM_COUNT=16
 CONFIG_BLK_DEV_RAM_SIZE=65536
 CONFIG_BLK_DEV_INITRD=y
 # CONFIG_CDROM_PKTCDVD is not set
-
-#
-# IO Schedulers
-#
-CONFIG_IOSCHED_NOOP=y
-CONFIG_IOSCHED_AS=y
-CONFIG_IOSCHED_DEADLINE=y
-CONFIG_IOSCHED_CFQ=y
 # CONFIG_ATA_OVER_ETH is not set
 
 #
@@ -473,6 +517,7 @@ CONFIG_SCSI_ISCSI_ATTRS=m
 #
 # SCSI low-level drivers
 #
+# CONFIG_ISCSI_TCP is not set
 # CONFIG_BLK_DEV_3W_XXXX_RAID is not set
 # CONFIG_SCSI_3W_9XXX is not set
 # CONFIG_SCSI_ACARD is not set
@@ -559,6 +604,7 @@ CONFIG_DM_MULTIPATH_EMC=m
 #
 # Macintosh device drivers
 #
+# CONFIG_WINDFARM is not set
 
 #
 # Network device support
@@ -645,7 +691,6 @@ CONFIG_IXGB=m
 # CONFIG_IXGB_NAPI is not set
 CONFIG_S2IO=m
 # CONFIG_S2IO_NAPI is not set
-# CONFIG_2BUFF_MODE is not set
 
 #
 # Token Ring devices
@@ -674,6 +719,7 @@ CONFIG_PPP_ASYNC=m
 CONFIG_PPP_SYNC_TTY=m
 CONFIG_PPP_DEFLATE=m
 CONFIG_PPP_BSDCOMP=m
+# CONFIG_PPP_MPPE is not set
 CONFIG_PPPOE=m
 # CONFIG_SLIP is not set
 # CONFIG_NET_FC is not set
@@ -784,6 +830,8 @@ CONFIG_HVCS=m
 #
 # CONFIG_WATCHDOG is not set
 # CONFIG_RTC is not set
+CONFIG_GEN_RTC=y
+# CONFIG_GEN_RTC_X is not set
 # CONFIG_DTLK is not set
 # CONFIG_R3964 is not set
 # CONFIG_APPLICOM is not set
@@ -801,6 +849,7 @@ CONFIG_MAX_RAW_DEVS=1024
 # TPM devices
 #
 # CONFIG_TCG_TPM is not set
+# CONFIG_TELCLOCK is not set
 
 #
 # I2C support
@@ -852,6 +901,7 @@ CONFIG_I2C_ALGOBIT=y
 # CONFIG_SENSORS_PCF8591 is not set
 # CONFIG_SENSORS_RTC8564 is not set
 # CONFIG_SENSORS_MAX6875 is not set
+# CONFIG_RTC_X1205_I2C is not set
 # CONFIG_I2C_DEBUG_CORE is not set
 # CONFIG_I2C_DEBUG_ALGO is not set
 # CONFIG_I2C_DEBUG_BUS is not set
@@ -893,7 +943,6 @@ CONFIG_FB=y
 CONFIG_FB_CFB_FILLRECT=y
 CONFIG_FB_CFB_COPYAREA=y
 CONFIG_FB_CFB_IMAGEBLIT=y
-CONFIG_FB_SOFT_CURSOR=y
 CONFIG_FB_MACMODES=y
 CONFIG_FB_MODE_HELPERS=y
 CONFIG_FB_TILEBLITTING=y
@@ -905,6 +954,7 @@ CONFIG_FB_OF=y
 # CONFIG_FB_ASILIANT is not set
 # CONFIG_FB_IMSTT is not set
 # CONFIG_FB_VGA16 is not set
+# CONFIG_FB_S1D13XXX is not set
 # CONFIG_FB_NVIDIA is not set
 # CONFIG_FB_RIVA is not set
 CONFIG_FB_MATROX=y
@@ -927,7 +977,6 @@ CONFIG_FB_RADEON_I2C=y
 # CONFIG_FB_VOODOO1 is not set
 # CONFIG_FB_CYBLA is not set
 # CONFIG_FB_TRIDENT is not set
-# CONFIG_FB_S1D13XXX is not set
 # CONFIG_FB_VIRTUAL is not set
 
 #
@@ -936,6 +985,7 @@ CONFIG_FB_RADEON_I2C=y
 # CONFIG_VGA_CONSOLE is not set
 CONFIG_DUMMY_CONSOLE=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
+# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
 # CONFIG_FONTS is not set
 CONFIG_FONT_8x8=y
 CONFIG_FONT_8x16=y
@@ -990,12 +1040,15 @@ CONFIG_USB_OHCI_LITTLE_ENDIAN=y
 #
 # USB Device Class drivers
 #
-# CONFIG_USB_BLUETOOTH_TTY is not set
 # CONFIG_USB_ACM is not set
 # CONFIG_USB_PRINTER is not set
 
 #
-# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support' may also be needed; see USB_STORAGE Help for more information
+# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support'
+#
+
+#
+# may also be needed; see USB_STORAGE Help for more information
 #
 CONFIG_USB_STORAGE=y
 # CONFIG_USB_STORAGE_DEBUG is not set
@@ -1106,6 +1159,7 @@ CONFIG_INFINIBAND_MTHCA=m
 # CONFIG_INFINIBAND_MTHCA_DEBUG is not set
 CONFIG_INFINIBAND_IPOIB=m
 # CONFIG_INFINIBAND_IPOIB_DEBUG is not set
+# CONFIG_INFINIBAND_SRP is not set
 
 #
 # SN Devices
@@ -1288,10 +1342,25 @@ CONFIG_NLS_ISO8859_1=y
 # CONFIG_NLS_UTF8 is not set
 
 #
-# Profiling support
+# Library routines
+#
+CONFIG_CRC_CCITT=m
+# CONFIG_CRC16 is not set
+CONFIG_CRC32=y
+CONFIG_LIBCRC32C=m
+CONFIG_ZLIB_INFLATE=y
+CONFIG_ZLIB_DEFLATE=m
+CONFIG_TEXTSEARCH=y
+CONFIG_TEXTSEARCH_KMP=m
+CONFIG_TEXTSEARCH_BM=m
+CONFIG_TEXTSEARCH_FSM=m
+
+#
+# Instrumentation Support
 #
 CONFIG_PROFILING=y
 CONFIG_OPROFILE=y
+# CONFIG_KPROBES is not set
 
 #
 # Kernel hacking
@@ -1308,14 +1377,15 @@ CONFIG_DETECT_SOFTLOCKUP=y
 # CONFIG_DEBUG_KOBJECT is not set
 # CONFIG_DEBUG_INFO is not set
 CONFIG_DEBUG_FS=y
+# CONFIG_DEBUG_VM is not set
+# CONFIG_RCU_TORTURE_TEST is not set
 CONFIG_DEBUG_STACKOVERFLOW=y
-# CONFIG_KPROBES is not set
 CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_DEBUGGER=y
 CONFIG_XMON=y
 CONFIG_XMON_DEFAULT=y
-# CONFIG_PPCDBG is not set
 CONFIG_IRQSTACKS=y
+# CONFIG_BOOTX_TEXT is not set
 
 #
 # Security options
@@ -1355,17 +1425,3 @@ CONFIG_CRYPTO_TEST=m
 #
 # Hardware crypto devices
 #
-
-#
-# Library routines
-#
-CONFIG_CRC_CCITT=m
-# CONFIG_CRC16 is not set
-CONFIG_CRC32=y
-CONFIG_LIBCRC32C=m
-CONFIG_ZLIB_INFLATE=y
-CONFIG_ZLIB_DEFLATE=m
-CONFIG_TEXTSEARCH=y
-CONFIG_TEXTSEARCH_KMP=m
-CONFIG_TEXTSEARCH_BM=m
-CONFIG_TEXTSEARCH_FSM=m
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 9a74b7ab03a4..046b4bf1f21e 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -25,7 +25,7 @@ obj-$(CONFIG_PPC_OF)		+= of_device.o
 procfs-$(CONFIG_PPC64)          := proc_ppc64.o
 obj-$(CONFIG_PROC_FS)           += $(procfs-y)
 rtaspci-$(CONFIG_PPC64)         := rtas_pci.o
-obj-$(CONFIG_PPC_RTAS)          += rtas.o $(rtaspci-y)
+obj-$(CONFIG_PPC_RTAS)          += rtas.o rtas-rtc.o $(rtaspci-y)
 obj-$(CONFIG_RTAS_FLASH)        += rtas_flash.o
 obj-$(CONFIG_RTAS_PROC)         += rtas-proc.o
 obj-$(CONFIG_LPARCFG)           += lparcfg.o
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;
+}
diff --git a/arch/powerpc/platforms/powermac/time.c b/arch/powerpc/platforms/powermac/time.c
index 4c7682a65227..b1714f9bd920 100644
--- a/arch/powerpc/platforms/powermac/time.c
+++ b/arch/powerpc/platforms/powermac/time.c
@@ -199,7 +199,7 @@ static unsigned long smu_get_time(void)
 #define smu_set_rtc_time(tm, spin)      0
 #endif
 
-unsigned long pmac_get_boot_time(void)
+unsigned long __init pmac_get_boot_time(void)
 {
         /* Get the time from the RTC, used only at boot time */
         switch (sys_ctrler) {