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d67ed2510d
CONFIG_OF can be set by a randconfig or by a user -- without setting the
early flattree option (OF_EARLY_FLATTREE). This causes build errors.
However, if randconfig or a user sets USE_OF in the Xtensa config,
the right kconfig symbols are set to fix the build.
Fixes these build errors:
../arch/xtensa/kernel/setup.c:67:19: error: ‘__dtb_start’ undeclared here (not in a function); did you mean ‘dtb_start’?
67 | void *dtb_start = __dtb_start;
| ^~~~~~~~~~~
../arch/xtensa/kernel/setup.c: In function 'xtensa_dt_io_area':
../arch/xtensa/kernel/setup.c:201:14: error: implicit declaration of function 'of_flat_dt_is_compatible'; did you mean 'of_machine_is_compatible'? [-Werror=implicit-function-declaration]
201 | if (!of_flat_dt_is_compatible(node, "simple-bus"))
../arch/xtensa/kernel/setup.c:204:18: error: implicit declaration of function 'of_get_flat_dt_prop' [-Werror=implicit-function-declaration]
204 | ranges = of_get_flat_dt_prop(node, "ranges", &len);
../arch/xtensa/kernel/setup.c:204:16: error: assignment to 'const __be32 *' {aka 'const unsigned int *'} from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
204 | ranges = of_get_flat_dt_prop(node, "ranges", &len);
| ^
../arch/xtensa/kernel/setup.c: In function 'early_init_devtree':
../arch/xtensa/kernel/setup.c:228:9: error: implicit declaration of function 'early_init_dt_scan'; did you mean 'early_init_devtree'? [-Werror=implicit-function-declaration]
228 | early_init_dt_scan(params);
../arch/xtensa/kernel/setup.c:229:9: error: implicit declaration of function 'of_scan_flat_dt' [-Werror=implicit-function-declaration]
229 | of_scan_flat_dt(xtensa_dt_io_area, NULL);
xtensa-elf-ld: arch/xtensa/mm/mmu.o:(.text+0x0): undefined reference to `xtensa_kio_paddr'
Fixes: da844a8177 ("xtensa: add device trees support")
Fixes: 6cb971114f ("xtensa: remap io area defined in device tree")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* xtensa mmu stuff
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*
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* Extracted from init.c
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*/
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#include <linux/memblock.h>
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#include <linux/percpu.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/cache.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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#include <asm/page.h>
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#include <asm/initialize_mmu.h>
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#include <asm/io.h>
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#if defined(CONFIG_HIGHMEM)
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static void * __init init_pmd(unsigned long vaddr, unsigned long n_pages)
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{
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pmd_t *pmd = pmd_off_k(vaddr);
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pte_t *pte;
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unsigned long i;
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n_pages = ALIGN(n_pages, PTRS_PER_PTE);
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pr_debug("%s: vaddr: 0x%08lx, n_pages: %ld\n",
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__func__, vaddr, n_pages);
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pte = memblock_alloc_low(n_pages * sizeof(pte_t), PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=%lx\n",
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__func__, n_pages * sizeof(pte_t), PAGE_SIZE);
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for (i = 0; i < n_pages; ++i)
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pte_clear(NULL, 0, pte + i);
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for (i = 0; i < n_pages; i += PTRS_PER_PTE, ++pmd) {
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pte_t *cur_pte = pte + i;
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BUG_ON(!pmd_none(*pmd));
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set_pmd(pmd, __pmd(((unsigned long)cur_pte) & PAGE_MASK));
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BUG_ON(cur_pte != pte_offset_kernel(pmd, 0));
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pr_debug("%s: pmd: 0x%p, pte: 0x%p\n",
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__func__, pmd, cur_pte);
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}
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return pte;
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}
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static void __init fixedrange_init(void)
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{
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BUILD_BUG_ON(FIXADDR_START < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
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init_pmd(FIXADDR_START, __end_of_fixed_addresses);
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}
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#endif
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void __init paging_init(void)
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{
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#ifdef CONFIG_HIGHMEM
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fixedrange_init();
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pkmap_page_table = init_pmd(PKMAP_BASE, LAST_PKMAP);
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kmap_init();
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#endif
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}
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/*
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* Flush the mmu and reset associated register to default values.
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*/
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void init_mmu(void)
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{
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#if !(XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY)
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/*
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* Writing zeros to the instruction and data TLBCFG special
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* registers ensure that valid values exist in the register.
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*
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* For existing PGSZID<w> fields, zero selects the first element
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* of the page-size array. For nonexistent PGSZID<w> fields,
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* zero is the best value to write. Also, when changing PGSZID<w>
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* fields, the corresponding TLB must be flushed.
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*/
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set_itlbcfg_register(0);
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set_dtlbcfg_register(0);
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#endif
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init_kio();
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local_flush_tlb_all();
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/* Set rasid register to a known value. */
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set_rasid_register(ASID_INSERT(ASID_USER_FIRST));
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/* Set PTEVADDR special register to the start of the page
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* table, which is in kernel mappable space (ie. not
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* statically mapped). This register's value is undefined on
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* reset.
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*/
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set_ptevaddr_register(XCHAL_PAGE_TABLE_VADDR);
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}
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void init_kio(void)
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{
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#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_USE_OF)
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/*
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* Update the IO area mapping in case xtensa_kio_paddr has changed
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*/
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write_dtlb_entry(__pte(xtensa_kio_paddr + CA_WRITEBACK),
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XCHAL_KIO_CACHED_VADDR + 6);
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write_itlb_entry(__pte(xtensa_kio_paddr + CA_WRITEBACK),
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XCHAL_KIO_CACHED_VADDR + 6);
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write_dtlb_entry(__pte(xtensa_kio_paddr + CA_BYPASS),
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XCHAL_KIO_BYPASS_VADDR + 6);
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write_itlb_entry(__pte(xtensa_kio_paddr + CA_BYPASS),
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XCHAL_KIO_BYPASS_VADDR + 6);
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#endif
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}
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