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author | Daniel Hellstrom <daniel@gaisler.com> | 2011-01-27 01:26:58 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2011-03-17 01:19:04 (GMT) |
commit | 7279b82cb1975ba4e337a549757f17418cfdffad (patch) | |
tree | be97311b59bf95471ab2aa6e303e92c9a4427ac9 /arch/sparc/kernel | |
parent | 684151a75bf25f5aeb8a23010da91a34e17b7353 (diff) | |
download | linux-fsl-qoriq-7279b82cb1975ba4e337a549757f17418cfdffad.tar.xz |
SPARC/LEON: power down instruction different of different LEONs
The way a LEON is powered down is implemented differently depending
on CHIP type. The AMBA Plug&Play system ID tells revision of GRLIB
and CHIP.
This is for example needed by the GR-LEON4-ITX board and the UT699.
Previously the power down support for LEON was limited to SMP, now
both SMP and UP systems use the instruction.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel')
-rw-r--r-- | arch/sparc/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/sparc/kernel/leon_kernel.c | 9 | ||||
-rw-r--r-- | arch/sparc/kernel/leon_pmc.c | 82 | ||||
-rw-r--r-- | arch/sparc/kernel/leon_smp.c | 16 |
4 files changed, 91 insertions, 17 deletions
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile index 599398f..27e7f25 100644 --- a/arch/sparc/kernel/Makefile +++ b/arch/sparc/kernel/Makefile @@ -54,6 +54,7 @@ obj-y += of_device_$(BITS).o obj-$(CONFIG_SPARC64) += prom_irqtrans.o obj-$(CONFIG_SPARC_LEON)+= leon_kernel.o +obj-$(CONFIG_SPARC_LEON)+= leon_pmc.o obj-$(CONFIG_SPARC64) += reboot.o obj-$(CONFIG_SPARC64) += sysfs.o diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c index fdab7f8..2f8a9a2 100644 --- a/arch/sparc/kernel/leon_kernel.c +++ b/arch/sparc/kernel/leon_kernel.c @@ -30,6 +30,7 @@ struct amba_apb_device leon_percpu_timer_dev[16]; int leondebug_irq_disable; int leon_debug_irqout; static int dummy_master_l10_counter; +unsigned long amba_system_id; unsigned long leon3_gptimer_irq; /* interrupt controller irq number */ unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */ @@ -117,10 +118,16 @@ void __init leon_init_timers(irq_handler_t counter_fn) master_l10_counter = (unsigned int *)&dummy_master_l10_counter; dummy_master_l10_counter = 0; - /*Find IRQMP IRQ Controller Registers base address otherwise bail out.*/ rootnp = of_find_node_by_path("/ambapp0"); if (!rootnp) goto bad; + + /* Find System ID: GRLIB build ID and optional CHIP ID */ + pp = of_find_property(rootnp, "systemid", &len); + if (pp) + amba_system_id = *(unsigned long *)pp->value; + + /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */ np = of_find_node_by_name(rootnp, "GAISLER_IRQMP"); if (!np) { np = of_find_node_by_name(rootnp, "01_00d"); diff --git a/arch/sparc/kernel/leon_pmc.c b/arch/sparc/kernel/leon_pmc.c new file mode 100644 index 0000000..519ca92 --- /dev/null +++ b/arch/sparc/kernel/leon_pmc.c @@ -0,0 +1,82 @@ +/* leon_pmc.c: LEON Power-down cpu_idle() handler + * + * Copyright (C) 2011 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB + */ + +#include <linux/init.h> +#include <linux/pm.h> + +#include <asm/leon_amba.h> +#include <asm/leon.h> + +/* List of Systems that need fixup instructions around power-down instruction */ +unsigned int pmc_leon_fixup_ids[] = { + AEROFLEX_UT699, + GAISLER_GR712RC, + LEON4_NEXTREME1, + 0 +}; + +int pmc_leon_need_fixup(void) +{ + unsigned int systemid = amba_system_id >> 16; + unsigned int *id; + + id = &pmc_leon_fixup_ids[0]; + while (*id != 0) { + if (*id == systemid) + return 1; + id++; + } + + return 0; +} + +/* + * CPU idle callback function for systems that need some extra handling + * See .../arch/sparc/kernel/process.c + */ +void pmc_leon_idle_fixup(void) +{ + /* Prepare an address to a non-cachable region. APB is always + * none-cachable. One instruction is executed after the Sleep + * instruction, we make sure to read the bus and throw away the + * value by accessing a non-cachable area, also we make sure the + * MMU does not get a TLB miss here by using the MMU BYPASS ASI. + */ + register unsigned int address = (unsigned int)leon3_irqctrl_regs; + __asm__ __volatile__ ( + "mov %%g0, %%asr19\n" + "lda [%0] %1, %%g0\n" + : + : "r"(address), "i"(ASI_LEON_BYPASS)); +} + +/* + * CPU idle callback function + * See .../arch/sparc/kernel/process.c + */ +void pmc_leon_idle(void) +{ + /* For systems without power-down, this will be no-op */ + __asm__ __volatile__ ("mov %g0, %asr19\n\t"); +} + +/* Install LEON Power Down function */ +static int __init leon_pmc_install(void) +{ + /* Assign power management IDLE handler */ + if (pmc_leon_need_fixup()) + pm_idle = pmc_leon_idle_fixup; + else + pm_idle = pmc_leon_idle; + + printk(KERN_INFO "leon: power management initialized\n"); + + return 0; +} + +/* This driver is not critical to the boot process, don't care + * if initialized late. + */ +late_initcall(leon_pmc_install); diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c index 16582d8..e9df87f 100644 --- a/arch/sparc/kernel/leon_smp.c +++ b/arch/sparc/kernel/leon_smp.c @@ -437,15 +437,6 @@ void __init leon_blackbox_current(unsigned *addr) } -/* - * CPU idle callback function - * See .../arch/sparc/kernel/process.c - */ -void pmc_leon_idle(void) -{ - __asm__ volatile ("mov %g0, %asr19"); -} - void __init leon_init_smp(void) { /* Patch ipi15 trap table */ @@ -456,13 +447,6 @@ void __init leon_init_smp(void) BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id, BTFIXUPCALL_NORM); - -#ifndef PMC_NO_IDLE - /* Assign power management IDLE handler */ - pm_idle = pmc_leon_idle; - printk(KERN_INFO "leon: power management initialized\n"); -#endif - } #endif /* CONFIG_SPARC_LEON */ |