diff options
| -rw-r--r-- | Documentation/xtensa/mmu.txt | 18 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/initialize_mmu.h | 9 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/io.h | 10 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/vectors.h | 8 | ||||
| -rw-r--r-- | arch/xtensa/kernel/setup.c | 37 | ||||
| -rw-r--r-- | arch/xtensa/mm/mmu.c | 16 |
6 files changed, 93 insertions, 5 deletions
diff --git a/Documentation/xtensa/mmu.txt b/Documentation/xtensa/mmu.txt index 2b1af76..0312fe6 100644 --- a/Documentation/xtensa/mmu.txt +++ b/Documentation/xtensa/mmu.txt @@ -44,3 +44,21 @@ After step 4, we jump to intended (linked) address of this code. 40..5F -> 40 40..5F -> pc -> pc 40..5F -> pc 20..3F -> 20 -> 20 20..3F -> 20 00..1F -> 00 -> 00 00..1F -> 00 + +The default location of IO peripherals is above 0xf0000000. This may change +using a "ranges" property in a device tree simple-bus node. See ePAPR 1.1, ยง6.5 +for details on the syntax and semantic of simple-bus nodes. The following +limitations apply: + +1. Only top level simple-bus nodes are considered + +2. Only one (first) simple-bus node is considered + +3. Empty "ranges" properties are not supported + +4. Only the first triplet in the "ranges" property is considered + +5. The parent-bus-address value is rounded down to the nearest 256MB boundary + +6. The IO area covers the entire 256MB segment of parent-bus-address; the + "ranges" triplet length field is ignored diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h index a2078a2..600781e 100644 --- a/arch/xtensa/include/asm/initialize_mmu.h +++ b/arch/xtensa/include/asm/initialize_mmu.h @@ -26,6 +26,9 @@ #include <asm/pgtable.h> #include <asm/vectors.h> +#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC) +#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC) + #ifdef __ASSEMBLY__ #define XTENSA_HWVERSION_RC_2009_0 230000 @@ -80,8 +83,6 @@ /* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code * and jump to the new mapping. */ -#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC) -#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC) srli a3, a0, 27 slli a3, a3, 27 @@ -124,12 +125,12 @@ witlb a4, a5 movi a5, XCHAL_KIO_CACHED_VADDR + 6 - movi a4, XCHAL_KIO_PADDR + CA_WRITEBACK + movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_WRITEBACK wdtlb a4, a5 witlb a4, a5 movi a5, XCHAL_KIO_BYPASS_VADDR + 6 - movi a4, XCHAL_KIO_PADDR + CA_BYPASS + movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_BYPASS wdtlb a4, a5 witlb a4, a5 diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h index 1482a363..2a042d4 100644 --- a/arch/xtensa/include/asm/io.h +++ b/arch/xtensa/include/asm/io.h @@ -24,6 +24,16 @@ #define IO_SPACE_LIMIT ~0 #ifdef CONFIG_MMU + +#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && CONFIG_OF +extern unsigned long xtensa_kio_paddr; + +static inline unsigned long xtensa_get_kio_paddr(void) +{ + return xtensa_kio_paddr; +} +#endif + /* * Return the virtual address for the specified bus memory. * Note that we currently don't support any address outside the KIO segment. diff --git a/arch/xtensa/include/asm/vectors.h b/arch/xtensa/include/asm/vectors.h index 221a60d..5791b45 100644 --- a/arch/xtensa/include/asm/vectors.h +++ b/arch/xtensa/include/asm/vectors.h @@ -22,9 +22,15 @@ #define XCHAL_KIO_CACHED_VADDR 0xe0000000 #define XCHAL_KIO_BYPASS_VADDR 0xf0000000 -#define XCHAL_KIO_PADDR 0xf0000000 +#define XCHAL_KIO_DEFAULT_PADDR 0xf0000000 #define XCHAL_KIO_SIZE 0x10000000 +#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && CONFIG_OF +#define XCHAL_KIO_PADDR xtensa_get_kio_paddr() +#else +#define XCHAL_KIO_PADDR XCHAL_KIO_DEFAULT_PADDR +#endif + #if defined(CONFIG_MMU) /* Will Become VECBASE */ diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c index f38bade..7d12af1 100644 --- a/arch/xtensa/kernel/setup.c +++ b/arch/xtensa/kernel/setup.c @@ -212,6 +212,42 @@ static int __init parse_bootparam(const bp_tag_t* tag) #ifdef CONFIG_OF bool __initdata dt_memory_scan = false; +#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY +unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR; +EXPORT_SYMBOL(xtensa_kio_paddr); + +static int __init xtensa_dt_io_area(unsigned long node, const char *uname, + int depth, void *data) +{ + const __be32 *ranges; + unsigned long len; + + if (depth > 1) + return 0; + + if (!of_flat_dt_is_compatible(node, "simple-bus")) + return 0; + + ranges = of_get_flat_dt_prop(node, "ranges", &len); + if (!ranges) + return 1; + if (len == 0) + return 1; + + xtensa_kio_paddr = of_read_ulong(ranges+1, 1); + /* round down to nearest 256MB boundary */ + xtensa_kio_paddr &= 0xf0000000; + + return 1; +} +#else +static int __init xtensa_dt_io_area(unsigned long node, const char *uname, + int depth, void *data) +{ + return 1; +} +#endif + void __init early_init_dt_add_memory_arch(u64 base, u64 size) { if (!dt_memory_scan) @@ -232,6 +268,7 @@ void __init early_init_devtree(void *params) dt_memory_scan = true; early_init_dt_scan(params); + of_scan_flat_dt(xtensa_dt_io_area, NULL); if (!command_line[0]) strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c index 5bb8e3c..36ec171 100644 --- a/arch/xtensa/mm/mmu.c +++ b/arch/xtensa/mm/mmu.c @@ -13,6 +13,8 @@ #include <asm/tlbflush.h> #include <asm/mmu_context.h> #include <asm/page.h> +#include <asm/initialize_mmu.h> +#include <asm/io.h> void __init paging_init(void) { @@ -37,6 +39,20 @@ void init_mmu(void) set_itlbcfg_register(0); set_dtlbcfg_register(0); #endif +#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && CONFIG_OF + /* + * Update the IO area mapping in case xtensa_kio_paddr has changed + */ + write_dtlb_entry(__pte(xtensa_kio_paddr + CA_WRITEBACK), + XCHAL_KIO_CACHED_VADDR + 6); + write_itlb_entry(__pte(xtensa_kio_paddr + CA_WRITEBACK), + XCHAL_KIO_CACHED_VADDR + 6); + write_dtlb_entry(__pte(xtensa_kio_paddr + CA_BYPASS), + XCHAL_KIO_BYPASS_VADDR + 6); + write_itlb_entry(__pte(xtensa_kio_paddr + CA_BYPASS), + XCHAL_KIO_BYPASS_VADDR + 6); +#endif + local_flush_tlb_all(); /* Set rasid register to a known value. */ |