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author | Ivan Kokshaysky <ink@jurassic.park.msu.ru> | 2009-01-15 21:51:19 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-16 00:39:40 (GMT) |
commit | 5f7dc5d75076fd1c1fc6bc09f2467509d20db24a (patch) | |
tree | c105f8463607381acd7d02bdda75641b3f497e37 /arch/alpha | |
parent | 2f88d151cb8e73587983d7feccd70672ff6730fe (diff) | |
download | linux-5f7dc5d75076fd1c1fc6bc09f2467509d20db24a.tar.xz |
alpha: fix RTC on marvel
Unlike other alphas, marvel doesn't have real PC-style CMOS clock hardware
- RTC accesses are emulated via PAL calls. Unfortunately, for unknown
reason these calls work only on CPU #0. So current implementation for
arbitrary CPU makes CMOS_READ/WRITE to be executed on CPU #0 via IPI.
However, for obvious reason this doesn't work with standard
get/set_rtc_time() functions, where a bunch of CMOS accesses is done with
disabled interrupts.
Solved by making the IPI calls for entire get/set_rtc_time() functions,
not for individual CMOS accesses. Which is also a lot more effective
performance-wise.
The patch is largely based on the code from Jay Estabrook.
My changes:
- tweak asm-generic/rtc.h by adding a couple of #defines to
avoid a massive code duplication in arch/alpha/include/asm/rtc.h;
- sys_marvel.c: fix get/set_rtc_time() return values (Jay's FIXMEs).
NOTE: this fixes *only* LIB_RTC drivers. Legacy (CONFIG_RTC) driver
wont't work on marvel. Actually I think that we should just disable
CONFIG_RTC on alpha (maybe in 2.6.30?), like most other arches - AFAIK,
all modern distributions use LIB_RTC anyway.
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha')
-rw-r--r-- | arch/alpha/include/asm/machvec.h | 4 | ||||
-rw-r--r-- | arch/alpha/include/asm/rtc.h | 12 | ||||
-rw-r--r-- | arch/alpha/kernel/core_marvel.c | 10 | ||||
-rw-r--r-- | arch/alpha/kernel/machvec_impl.h | 5 | ||||
-rw-r--r-- | arch/alpha/kernel/proto.h | 2 | ||||
-rw-r--r-- | arch/alpha/kernel/sys_jensen.c | 2 | ||||
-rw-r--r-- | arch/alpha/kernel/sys_marvel.c | 56 | ||||
-rw-r--r-- | arch/alpha/kernel/time.c | 10 |
8 files changed, 87 insertions, 14 deletions
diff --git a/arch/alpha/include/asm/machvec.h b/arch/alpha/include/asm/machvec.h index a86c083..fea4ea7 100644 --- a/arch/alpha/include/asm/machvec.h +++ b/arch/alpha/include/asm/machvec.h @@ -21,6 +21,7 @@ struct pci_dev; struct pci_ops; struct pci_controller; struct _alpha_agp_info; +struct rtc_time; struct alpha_machine_vector { @@ -94,6 +95,9 @@ struct alpha_machine_vector struct _alpha_agp_info *(*agp_info)(void); + unsigned int (*rtc_get_time)(struct rtc_time *); + int (*rtc_set_time)(struct rtc_time *); + const char *vector_name; /* NUMA information */ diff --git a/arch/alpha/include/asm/rtc.h b/arch/alpha/include/asm/rtc.h index 4e854b1..1f7fba6 100644 --- a/arch/alpha/include/asm/rtc.h +++ b/arch/alpha/include/asm/rtc.h @@ -1,9 +1,15 @@ #ifndef _ALPHA_RTC_H #define _ALPHA_RTC_H -/* - * Alpha uses the default access methods for the RTC. - */ +#if defined(CONFIG_ALPHA_GENERIC) +# define get_rtc_time alpha_mv.rtc_get_time +# define set_rtc_time alpha_mv.rtc_set_time +#else +# if defined(CONFIG_ALPHA_MARVEL) && defined(CONFIG_SMP) +# define get_rtc_time marvel_get_rtc_time +# define set_rtc_time marvel_set_rtc_time +# endif +#endif #include <asm-generic/rtc.h> diff --git a/arch/alpha/kernel/core_marvel.c b/arch/alpha/kernel/core_marvel.c index 9cd8dca..e302dae 100644 --- a/arch/alpha/kernel/core_marvel.c +++ b/arch/alpha/kernel/core_marvel.c @@ -658,16 +658,8 @@ __marvel_rtc_io(u8 b, unsigned long addr, int write) rtc_access.data = bcd2bin(b); rtc_access.function = 0x48 + !write; /* GET/PUT_TOY */ -#ifdef CONFIG_SMP - if (smp_processor_id() != boot_cpuid) - smp_call_function_single(boot_cpuid, - __marvel_access_rtc, - &rtc_access, 1); - else - __marvel_access_rtc(&rtc_access); -#else __marvel_access_rtc(&rtc_access); -#endif + ret = bin2bcd(rtc_access.data); break; diff --git a/arch/alpha/kernel/machvec_impl.h b/arch/alpha/kernel/machvec_impl.h index 466c9df..512685f 100644 --- a/arch/alpha/kernel/machvec_impl.h +++ b/arch/alpha/kernel/machvec_impl.h @@ -40,7 +40,10 @@ #define CAT1(x,y) x##y #define CAT(x,y) CAT1(x,y) -#define DO_DEFAULT_RTC .rtc_port = 0x70 +#define DO_DEFAULT_RTC \ + .rtc_port = 0x70, \ + .rtc_get_time = common_get_rtc_time, \ + .rtc_set_time = common_set_rtc_time #define DO_EV4_MMU \ .max_asn = EV4_MAX_ASN, \ diff --git a/arch/alpha/kernel/proto.h b/arch/alpha/kernel/proto.h index 708d5ca..fe14c67 100644 --- a/arch/alpha/kernel/proto.h +++ b/arch/alpha/kernel/proto.h @@ -145,6 +145,8 @@ extern void smp_percpu_timer_interrupt(struct pt_regs *); extern irqreturn_t timer_interrupt(int irq, void *dev); extern void common_init_rtc(void); extern unsigned long est_cycle_freq; +extern unsigned int common_get_rtc_time(struct rtc_time *time); +extern int common_set_rtc_time(struct rtc_time *time); /* smc37c93x.c */ extern void SMC93x_Init(void); diff --git a/arch/alpha/kernel/sys_jensen.c b/arch/alpha/kernel/sys_jensen.c index 2c3de97..e2516f9 100644 --- a/arch/alpha/kernel/sys_jensen.c +++ b/arch/alpha/kernel/sys_jensen.c @@ -261,6 +261,8 @@ struct alpha_machine_vector jensen_mv __initmv = { .machine_check = jensen_machine_check, .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, .rtc_port = 0x170, + .rtc_get_time = common_get_rtc_time, + .rtc_set_time = common_set_rtc_time, .nr_irqs = 16, .device_interrupt = jensen_device_interrupt, diff --git a/arch/alpha/kernel/sys_marvel.c b/arch/alpha/kernel/sys_marvel.c index 828449c..c5a1a24 100644 --- a/arch/alpha/kernel/sys_marvel.c +++ b/arch/alpha/kernel/sys_marvel.c @@ -23,6 +23,7 @@ #include <asm/hwrpb.h> #include <asm/tlbflush.h> #include <asm/vga.h> +#include <asm/rtc.h> #include "proto.h" #include "err_impl.h" @@ -426,6 +427,57 @@ marvel_init_rtc(void) init_rtc_irq(); } +struct marvel_rtc_time { + struct rtc_time *time; + int retval; +}; + +#ifdef CONFIG_SMP +static void +smp_get_rtc_time(void *data) +{ + struct marvel_rtc_time *mrt = data; + mrt->retval = __get_rtc_time(mrt->time); +} + +static void +smp_set_rtc_time(void *data) +{ + struct marvel_rtc_time *mrt = data; + mrt->retval = __set_rtc_time(mrt->time); +} +#endif + +static unsigned int +marvel_get_rtc_time(struct rtc_time *time) +{ +#ifdef CONFIG_SMP + struct marvel_rtc_time mrt; + + if (smp_processor_id() != boot_cpuid) { + mrt.time = time; + smp_call_function_single(boot_cpuid, smp_get_rtc_time, &mrt, 1); + return mrt.retval; + } +#endif + return __get_rtc_time(time); +} + +static int +marvel_set_rtc_time(struct rtc_time *time) +{ +#ifdef CONFIG_SMP + struct marvel_rtc_time mrt; + + if (smp_processor_id() != boot_cpuid) { + mrt.time = time; + smp_call_function_single(boot_cpuid, smp_set_rtc_time, &mrt, 1); + return mrt.retval; + } +#endif + return __set_rtc_time(time); +} + static void marvel_smp_callin(void) { @@ -466,7 +518,9 @@ marvel_smp_callin(void) struct alpha_machine_vector marvel_ev7_mv __initmv = { .vector_name = "MARVEL/EV7", DO_EV7_MMU, - DO_DEFAULT_RTC, + .rtc_port = 0x70, + .rtc_get_time = marvel_get_rtc_time, + .rtc_set_time = marvel_set_rtc_time, DO_MARVEL_IO, .machine_check = marvel_machine_check, .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c index e6a2314..b04e2cb 100644 --- a/arch/alpha/kernel/time.c +++ b/arch/alpha/kernel/time.c @@ -46,6 +46,7 @@ #include <asm/io.h> #include <asm/hwrpb.h> #include <asm/8253pit.h> +#include <asm/rtc.h> #include <linux/mc146818rtc.h> #include <linux/time.h> @@ -180,6 +181,15 @@ common_init_rtc(void) init_rtc_irq(); } +unsigned int common_get_rtc_time(struct rtc_time *time) +{ + return __get_rtc_time(time); +} + +int common_set_rtc_time(struct rtc_time *time) +{ + return __set_rtc_time(time); +} /* Validate a computed cycle counter result against the known bounds for the given processor core. There's too much brokenness in the way of |