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author | KyongHo Cho <pullip.cho@samsung.com> | 2011-03-07 08:56:48 +0900 |
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committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-03-15 21:37:25 +0900 |
commit | b34f003f271d477f61a980d280afc77929047440 (patch) | |
tree | 475069c7d6760669ad79eb1d2cc07dd981cdf143 /arch/arm/plat-s5p/include/plat | |
parent | 721bbd4a06e83995ac1679d9cdca19a608fb0122 (diff) | |
download | op-kernel-dev-b34f003f271d477f61a980d280afc77929047440.zip op-kernel-dev-b34f003f271d477f61a980d280afc77929047440.tar.gz |
ARM: EXYNOS4: Enhancement of System MMU driver
This patch includes the following enhancements for System MMU:
- Enhanced readability
- Removal of unused data structures or their members
- Simplified function definitions
- Corrections of some logical errors
- Full compliance with Linux coding style
- Simpler way of registering callback functions of System MMU faults
Signed-off-by: KyongHo Cho <pullip.cho@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/plat-s5p/include/plat')
-rw-r--r-- | arch/arm/plat-s5p/include/plat/sysmmu.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/arm/plat-s5p/include/plat/sysmmu.h b/arch/arm/plat-s5p/include/plat/sysmmu.h new file mode 100644 index 0000000..bf5283c --- /dev/null +++ b/arch/arm/plat-s5p/include/plat/sysmmu.h @@ -0,0 +1,95 @@ +/* linux/arch/arm/plat-s5p/include/plat/sysmmu.h + * + * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Samsung System MMU driver for S5P platform + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#ifndef __ASM__PLAT_SYSMMU_H +#define __ASM__PLAT_SYSMMU_H __FILE__ + +enum S5P_SYSMMU_INTERRUPT_TYPE { + SYSMMU_PAGEFAULT, + SYSMMU_AR_MULTIHIT, + SYSMMU_AW_MULTIHIT, + SYSMMU_BUSERROR, + SYSMMU_AR_SECURITY, + SYSMMU_AR_ACCESS, + SYSMMU_AW_SECURITY, + SYSMMU_AW_PROTECTION, /* 7 */ + SYSMMU_FAULTS_NUM +}; + +#ifdef CONFIG_S5P_SYSTEM_MMU + +#include <mach/sysmmu.h> + +/** + * s5p_sysmmu_enable() - enable system mmu of ip + * @ips: The ip connected system mmu. + * #pgd: Base physical address of the 1st level page table + * + * This function enable system mmu to transfer address + * from virtual address to physical address + */ +void s5p_sysmmu_enable(sysmmu_ips ips, unsigned long pgd); + +/** + * s5p_sysmmu_disable() - disable sysmmu mmu of ip + * @ips: The ip connected system mmu. + * + * This function disable system mmu to transfer address + * from virtual address to physical address + */ +void s5p_sysmmu_disable(sysmmu_ips ips); + +/** + * s5p_sysmmu_set_tablebase_pgd() - set page table base address to refer page table + * @ips: The ip connected system mmu. + * @pgd: The page table base address. + * + * This function set page table base address + * When system mmu transfer address from virtaul address to physical address, + * system mmu refer address information from page table + */ +void s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd); + +/** + * s5p_sysmmu_tlb_invalidate() - flush all TLB entry in system mmu + * @ips: The ip connected system mmu. + * + * This function flush all TLB entry in system mmu + */ +void s5p_sysmmu_tlb_invalidate(sysmmu_ips ips); + +/** s5p_sysmmu_set_fault_handler() - Fault handler for System MMUs + * @itype: type of fault. + * @pgtable_base: the physical address of page table base. This is 0 if @ips is + * SYSMMU_BUSERROR. + * @fault_addr: the device (virtual) address that the System MMU tried to + * translated. This is 0 if @ips is SYSMMU_BUSERROR. + * Called when interrupt occurred by the System MMUs + * The device drivers of peripheral devices that has a System MMU can implement + * a fault handler to resolve address translation fault by System MMU. + * The meanings of return value and parameters are described below. + + * return value: non-zero if the fault is correctly resolved. + * zero if the fault is not handled. + */ +void s5p_sysmmu_set_fault_handler(sysmmu_ips ips, + int (*handler)(enum S5P_SYSMMU_INTERRUPT_TYPE itype, + unsigned long pgtable_base, + unsigned long fault_addr)); +#else +#define s5p_sysmmu_enable(ips, pgd) do { } while (0) +#define s5p_sysmmu_disable(ips) do { } while (0) +#define s5p_sysmmu_set_tablebase_pgd(ips, pgd) do { } while (0) +#define s5p_sysmmu_tlb_invalidate(ips) do { } while (0) +#define s5p_sysmmu_set_fault_handler(ips, handler) do { } while (0) +#endif +#endif /* __ASM_PLAT_SYSMMU_H */ |