diff options
Diffstat (limited to 'arch/x86/platform/olpc/olpc.c')
| -rw-r--r-- | arch/x86/platform/olpc/olpc.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c index 0060fd59ea0..72fd041762f 100644 --- a/arch/x86/platform/olpc/olpc.c +++ b/arch/x86/platform/olpc/olpc.c @@ -19,6 +19,7 @@ #include <linux/string.h> #include <linux/platform_device.h> #include <linux/of.h> +#include <linux/syscore_ops.h> #include <asm/geode.h> #include <asm/setup.h> @@ -30,6 +31,9 @@ EXPORT_SYMBOL_GPL(olpc_platform_info); static DEFINE_SPINLOCK(ec_lock); +/* EC event mask to be applied during suspend (defining wakeup sources). */ +static u16 ec_wakeup_mask; + /* what the timeout *should* be (in ms) */ #define EC_BASE_TIMEOUT 20 @@ -188,6 +192,79 @@ err: } EXPORT_SYMBOL_GPL(olpc_ec_cmd); +void olpc_ec_wakeup_set(u16 value) +{ + ec_wakeup_mask |= value; +} +EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set); + +void olpc_ec_wakeup_clear(u16 value) +{ + ec_wakeup_mask &= ~value; +} +EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear); + +/* + * Returns true if the compile and runtime configurations allow for EC events + * to wake the system. + */ +bool olpc_ec_wakeup_available(void) +{ + if (!machine_is_olpc()) + return false; + + /* + * XO-1 EC wakeups are available when olpc-xo1-sci driver is + * compiled in + */ +#ifdef CONFIG_OLPC_XO1_SCI + if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */ + return true; +#endif + + return false; +} +EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available); + +int olpc_ec_mask_write(u16 bits) +{ + if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) { + __be16 ec_word = cpu_to_be16(bits); + return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2, + NULL, 0); + } else { + unsigned char ec_byte = bits & 0xff; + return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0); + } +} +EXPORT_SYMBOL_GPL(olpc_ec_mask_write); + +int olpc_ec_sci_query(u16 *sci_value) +{ + int ret; + + if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) { + __be16 ec_word; + ret = olpc_ec_cmd(EC_EXT_SCI_QUERY, + NULL, 0, (void *) &ec_word, 2); + if (ret == 0) + *sci_value = be16_to_cpu(ec_word); + } else { + unsigned char ec_byte; + ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1); + if (ret == 0) + *sci_value = ec_byte; + } + + return ret; +} +EXPORT_SYMBOL_GPL(olpc_ec_sci_query); + +static int olpc_ec_suspend(void) +{ + return olpc_ec_mask_write(ec_wakeup_mask); +} + static bool __init check_ofw_architecture(struct device_node *root) { const char *olpc_arch; @@ -242,6 +319,10 @@ static int __init add_xo1_platform_devices(void) return 0; } +static struct syscore_ops olpc_syscore_ops = { + .suspend = olpc_ec_suspend, +}; + static int __init olpc_init(void) { int r = 0; @@ -266,6 +347,9 @@ static int __init olpc_init(void) !cs5535_has_vsa2()) x86_init.pci.arch_init = pci_olpc_init; #endif + /* EC version 0x5f adds support for wide SCI mask */ + if (olpc_platform_info.ecver >= 0x5f) + olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI; printk(KERN_INFO "OLPC board revision %s%X (EC=%x)\n", ((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "", @@ -278,6 +362,8 @@ static int __init olpc_init(void) return r; } + register_syscore_ops(&olpc_syscore_ops); + return 0; } |