[PATCH] Heartbeat LED for iBook
From: Joerg Dorchain <hidden>
Date: 2005-01-18 09:42:28
Hi all, after looking at the ide driver (see previous post) and with references to my good old A4000, I felt inspired to do this little hack. It is in works-for-me state (iBook G4), but as the actual code is shamelessly taken from the ide driver, I suppose it to work on all the machines where the IDE driver can blink the led. You can use it together with the ide blinking option, although the heartbeat will look bumpy when the hd is active (don't worry, no heart attack ;-) There is further optimization possible on the ppc_md.heartbeat_count and the cnt variables. Oh, this patch is against vanilla 2.6.10. Bye, Joerg
--- ./arch/ppc/platforms/pmac_setup.c.hb 2005-01-17 22:39:08.000000000 +0100
+++ ./arch/ppc/platforms/pmac_setup.c 2005-01-18 01:09:08.325332888 +0100@@ -240,6 +240,37 @@ static volatile u32 *sysctrl_regs; +#ifdef CONFIG_HEARTBEAT +static struct adb_request pmu_blink_on, pmu_blink_off; + +/* adapted from arch_m68k */ +static void pb_heartbeat(void) +{ + static unsigned cnt = 0, period = 0, dist = 0; + + if (cnt == 0 || cnt == dist) { + if (pmu_blink_on.complete) + pmu_request(&pmu_blink_on, NULL, 4, 0xee, 4, 0, 1); + } else if (cnt == 7 || cnt == dist + 7 ) { + if (pmu_blink_off.complete) + pmu_request(&pmu_blink_off, NULL, 4, 0xee, 4, 0, 0); + } + + if (++cnt > period) { + cnt = 0; + /* The hyperbolic function below modifies the heartbeat period + * length in dependency of the current (5min) load. It goes + * through the points f(0)=126, f(1)=86, f(5)=51, + * f(inf)->30. */ + period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; + dist = period / 4; + } + + /* keep on going on ppc and account for HZ value */ + ppc_md.heartbeat_count = HZ/100; +} +#endif /* CONFIG_HEARTBEAT */ + void __init pmac_setup_arch(void) {
@@ -333,6 +364,26 @@ ppc_md.smp_ops = &psurge_smp_ops; #endif /* CONFIG_SMP */ +#ifdef CONFIG_HEARTBEAT + /* Copied from the IDE blinking code */ + if (pmu_get_model() == PMU_KEYLARGO_BASED) { + struct device_node *dt; + const char *model; + + if ((dt = find_devices("device-tree")) != NULL) { + if ((model = (const char *)get_property(dt, "model", NULL)) != NULL) { + if (!strncmp(model, "PowerBook", strlen("PowerBook")) || + !strncmp(model, "iBook", strlen("iBook")) ) { + pmu_blink_on.complete = 1; + pmu_blink_off.complete = 1; + ppc_md.heartbeat = pb_heartbeat; + ppc_md.heartbeat_count = 1; + } + } + } + } +#endif /* CONFIG_HEARTBEAT */ + pci_create_OF_bus_map(); } --- ./arch/ppc/Kconfig.hb 2005-01-17 23:57:40.000000000 +0100 +++ ./arch/ppc/Kconfig 2005-01-18 00:09:14.000000000 +0100
@@ -954,7 +954,7 @@ config HEARTBEAT bool "Use power LED as a heartbeat" - depends on APUS + depends on APUS || (PPC_PMAC && ADB_PMU) help Use the power-on LED on your machine as a load meter. The exact behavior is platform-dependent, but normally the flash frequency is
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