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author | Len Brown <len.brown@intel.com> | 2005-09-08 01:45:47 -0400 |
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committer | Len Brown <len.brown@intel.com> | 2005-09-08 01:45:47 -0400 |
commit | 64e47488c913ac704d465a6af86a26786d1412a5 (patch) | |
tree | d3b0148592963dcde26e4bb35ddfec8b1eaf8e23 /arch/i386/kernel/i8237.c | |
parent | 4a35a46bf1cda4737c428380d1db5d15e2590d18 (diff) | |
parent | caf39e87cc1182f7dae84eefc43ca14d54c78ef9 (diff) | |
download | op-kernel-dev-64e47488c913ac704d465a6af86a26786d1412a5.zip op-kernel-dev-64e47488c913ac704d465a6af86a26786d1412a5.tar.gz |
Merge linux-2.6 with linux-acpi-2.6
Diffstat (limited to 'arch/i386/kernel/i8237.c')
-rw-r--r-- | arch/i386/kernel/i8237.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/i386/kernel/i8237.c b/arch/i386/kernel/i8237.c new file mode 100644 index 0000000..c36d1c0 --- /dev/null +++ b/arch/i386/kernel/i8237.c @@ -0,0 +1,67 @@ +/* + * i8237.c: 8237A DMA controller suspend functions. + * + * Written by Pierre Ossman, 2005. + */ + +#include <linux/init.h> +#include <linux/sysdev.h> + +#include <asm/dma.h> + +/* + * This module just handles suspend/resume issues with the + * 8237A DMA controller (used for ISA and LPC). + * Allocation is handled in kernel/dma.c and normal usage is + * in asm/dma.h. + */ + +static int i8237A_resume(struct sys_device *dev) +{ + unsigned long flags; + int i; + + flags = claim_dma_lock(); + + dma_outb(DMA1_RESET_REG, 0); + dma_outb(DMA2_RESET_REG, 0); + + for (i = 0;i < 8;i++) { + set_dma_addr(i, 0x000000); + /* DMA count is a bit weird so this is not 0 */ + set_dma_count(i, 1); + } + + /* Enable cascade DMA or channel 0-3 won't work */ + enable_dma(4); + + release_dma_lock(flags); + + return 0; +} + +static int i8237A_suspend(struct sys_device *dev, pm_message_t state) +{ + return 0; +} + +static struct sysdev_class i8237_sysdev_class = { + set_kset_name("i8237"), + .suspend = i8237A_suspend, + .resume = i8237A_resume, +}; + +static struct sys_device device_i8237A = { + .id = 0, + .cls = &i8237_sysdev_class, +}; + +static int __init i8237A_init_sysfs(void) +{ + int error = sysdev_class_register(&i8237_sysdev_class); + if (!error) + error = sysdev_register(&device_i8237A); + return error; +} + +device_initcall(i8237A_init_sysfs); |