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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc/kernel/pmc.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/sparc/kernel/pmc.c')
-rw-r--r-- | arch/sparc/kernel/pmc.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pmc.c b/arch/sparc/kernel/pmc.c new file mode 100644 index 0000000..7eca887 --- /dev/null +++ b/arch/sparc/kernel/pmc.c @@ -0,0 +1,99 @@ +/* pmc - Driver implementation for power management functions + * of Power Management Controller (PMC) on SPARCstation-Voyager. + * + * Copyright (c) 2002 Eric Brower (ebrower@usa.net) + */ + +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/miscdevice.h> +#include <linux/pm.h> + +#include <asm/io.h> +#include <asm/sbus.h> +#include <asm/oplib.h> +#include <asm/uaccess.h> +#include <asm/auxio.h> + +/* Debug + * + * #define PMC_DEBUG_LED + * #define PMC_NO_IDLE + */ + +#define PMC_MINOR MISC_DYNAMIC_MINOR +#define PMC_OBPNAME "SUNW,pmc" +#define PMC_DEVNAME "pmc" + +#define PMC_IDLE_REG 0x00 +#define PMC_IDLE_ON 0x01 + +volatile static u8 __iomem *regs; +static int pmc_regsize; + +#define pmc_readb(offs) (sbus_readb(regs+offs)) +#define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs)) + +/* + * CPU idle callback function + * See .../arch/sparc/kernel/process.c + */ +void pmc_swift_idle(void) +{ +#ifdef PMC_DEBUG_LED + set_auxio(0x00, AUXIO_LED); +#endif + + pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG); + +#ifdef PMC_DEBUG_LED + set_auxio(AUXIO_LED, 0x00); +#endif +} + +static inline void pmc_free(void) +{ + sbus_iounmap(regs, pmc_regsize); +} + +static int __init pmc_probe(void) +{ + struct sbus_bus *sbus = NULL; + struct sbus_dev *sdev = NULL; + for_each_sbus(sbus) { + for_each_sbusdev(sdev, sbus) { + if (!strcmp(sdev->prom_name, PMC_OBPNAME)) { + goto sbus_done; + } + } + } + +sbus_done: + if (!sdev) { + return -ENODEV; + } + + pmc_regsize = sdev->reg_addrs[0].reg_size; + regs = sbus_ioremap(&sdev->resource[0], 0, + pmc_regsize, PMC_OBPNAME); + if (!regs) { + printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); + return -ENODEV; + } + +#ifndef PMC_NO_IDLE + /* Assign power management IDLE handler */ + pm_idle = pmc_swift_idle; +#endif + + printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); + return 0; +} + +/* This driver is not critical to the boot process + * and is easiest to ioremap when SBus is already + * initialized, so we install ourselves thusly: + */ +__initcall(pmc_probe); |