diff options
Diffstat (limited to 'arch/parisc/kernel/pci-dma.c')
| -rw-r--r-- | arch/parisc/kernel/pci-dma.c | 246 |
1 files changed, 57 insertions, 189 deletions
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c index d87d1c476d85..bf9f192c826e 100644 --- a/arch/parisc/kernel/pci-dma.c +++ b/arch/parisc/kernel/pci-dma.c @@ -1,8 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* ** PARISC 1.1 Dynamic DMA mapping support. ** This implementation is for PA-RISC platforms that do not support ** I/O TLBs (aka DMA address translation hardware). -** See Documentation/DMA-API-HOWTO.txt for interface definitions. +** See Documentation/core-api/dma-api-howto.rst for interface definitions. ** ** (c) Copyright 1999,2000 Hewlett-Packard Company ** (c) Copyright 2000 Grant Grundler @@ -20,28 +21,26 @@ #include <linux/init.h> #include <linux/gfp.h> #include <linux/mm.h> -#include <linux/pci.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/string.h> #include <linux/types.h> -#include <linux/scatterlist.h> -#include <linux/export.h> +#include <linux/dma-direct.h> +#include <linux/dma-map-ops.h> #include <asm/cacheflush.h> #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ #include <asm/io.h> #include <asm/page.h> /* get_order */ -#include <asm/pgalloc.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/tlbflush.h> /* for purge_tlb_*() macros */ static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; -static unsigned long pcxl_used_bytes __read_mostly = 0; -static unsigned long pcxl_used_pages __read_mostly = 0; +static unsigned long pcxl_used_bytes __read_mostly; +static unsigned long pcxl_used_pages __read_mostly; -extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ -static spinlock_t pcxl_res_lock; +unsigned long pcxl_dma_start __ro_after_init; /* pcxl dma mapping area start */ +static DEFINE_SPINLOCK(pcxl_res_lock); static char *pcxl_res_map; static int pcxl_res_hint; static int pcxl_res_size; @@ -74,11 +73,6 @@ void dump_resmap(void) static inline void dump_resmap(void) {;} #endif -static int pa11_dma_supported( struct device *dev, u64 mask) -{ - return 1; -} - static inline int map_pte_uncached(pte_t * pte, unsigned long vaddr, unsigned long size, unsigned long *paddr_ptr) @@ -95,9 +89,9 @@ static inline int map_pte_uncached(pte_t * pte, if (!pte_none(*pte)) printk(KERN_ERR "map_pte_uncached: page already exists\n"); - set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); purge_tlb_start(flags); - pdtlb_kernel(orig_vaddr); + set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); + pdtlb(SR_KERNEL, orig_vaddr); purge_tlb_end(flags); vaddr += PAGE_SIZE; orig_vaddr += PAGE_SIZE; @@ -138,9 +132,14 @@ static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, dir = pgd_offset_k(vaddr); do { + p4d_t *p4d; + pud_t *pud; pmd_t *pmd; - - pmd = pmd_alloc(NULL, dir, vaddr); + + p4d = p4d_offset(dir, vaddr); + pud = pud_offset(p4d, vaddr); + pmd = pmd_alloc(NULL, pud, vaddr); + if (!pmd) return -ENOMEM; if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) @@ -165,7 +164,7 @@ static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, pmd_clear(pmd); return; } - pte = pte_offset_map(pmd, vaddr); + pte = pte_offset_kernel(pmd, vaddr); vaddr &= ~PMD_MASK; end = vaddr + size; if (end > PMD_SIZE) @@ -176,7 +175,7 @@ static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, pte_clear(&init_mm, vaddr, pte); purge_tlb_start(flags); - pdtlb_kernel(orig_vaddr); + pdtlb(SR_KERNEL, orig_vaddr); purge_tlb_end(flags); vaddr += PAGE_SIZE; orig_vaddr += PAGE_SIZE; @@ -201,7 +200,7 @@ static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, pgd_clear(dir); return; } - pmd = pmd_offset(dir, vaddr); + pmd = pmd_offset(pud_offset(p4d_offset(dir, vaddr), vaddr), vaddr); vaddr &= ~PGDIR_MASK; end = vaddr + size; if (end > PGDIR_SIZE) @@ -246,7 +245,7 @@ static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) PCXL_SEARCH_LOOP(idx, mask, size); \ } -unsigned long +static unsigned long pcxl_alloc_range(size_t size) { int res_idx; @@ -336,7 +335,7 @@ pcxl_free_range(unsigned long vaddr, size_t size) dump_resmap(); } -static int proc_pcxl_dma_show(struct seq_file *m, void *v) +static int __maybe_unused proc_pcxl_dma_show(struct seq_file *m, void *v) { #if 0 u_long i = 0; @@ -371,39 +370,25 @@ static int proc_pcxl_dma_show(struct seq_file *m, void *v) return 0; } -static int proc_pcxl_dma_open(struct inode *inode, struct file *file) -{ - return single_open(file, proc_pcxl_dma_show, NULL); -} - -static const struct file_operations proc_pcxl_dma_ops = { - .owner = THIS_MODULE, - .open = proc_pcxl_dma_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - static int __init pcxl_dma_init(void) { if (pcxl_dma_start == 0) return 0; - spin_lock_init(&pcxl_res_lock); pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); pcxl_res_hint = 0; pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, get_order(pcxl_res_size)); memset(pcxl_res_map, 0, pcxl_res_size); - proc_gsc_root = proc_mkdir("gsc", NULL); + proc_gsc_root = proc_mkdir("bus/gsc", NULL); if (!proc_gsc_root) printk(KERN_WARNING "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); else { struct proc_dir_entry* ent; - ent = proc_create("pcxl_dma", 0, proc_gsc_root, - &proc_pcxl_dma_ops); + ent = proc_create_single("pcxl_dma", 0, proc_gsc_root, + proc_pcxl_dma_show); if (!ent) printk(KERN_WARNING "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); @@ -413,184 +398,67 @@ pcxl_dma_init(void) __initcall(pcxl_dma_init); -static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) +void *arch_dma_alloc(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { unsigned long vaddr; unsigned long paddr; int order; + if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl) + return NULL; + order = get_order(size); size = 1 << (order + PAGE_SHIFT); vaddr = pcxl_alloc_range(size); - paddr = __get_free_pages(flag, order); + paddr = __get_free_pages(gfp | __GFP_ZERO, order); flush_kernel_dcache_range(paddr, size); paddr = __pa(paddr); map_uncached_pages(vaddr, size, paddr); *dma_handle = (dma_addr_t) paddr; -#if 0 -/* This probably isn't needed to support EISA cards. -** ISA cards will certainly only support 24-bit DMA addressing. -** Not clear if we can, want, or need to support ISA. -*/ - if (!dev || *dev->coherent_dma_mask < 0xffffffff) - gfp |= GFP_DMA; -#endif return (void *)vaddr; } -static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) +void arch_dma_free(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, unsigned long attrs) { - int order; + int order = get_order(size); + + WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 && + boot_cpu_data.cpu_type != pcxl); - order = get_order(size); size = 1 << (order + PAGE_SHIFT); unmap_uncached_pages((unsigned long)vaddr, size); pcxl_free_range((unsigned long)vaddr, size); - free_pages((unsigned long)__va(dma_handle), order); -} - -static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - flush_kernel_dcache_range((unsigned long) addr, size); - return virt_to_phys(addr); + free_pages((unsigned long)__va(dma_handle), order); } -static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) +void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { - BUG_ON(direction == DMA_NONE); - - if (direction == DMA_TO_DEVICE) - return; - /* - * For PCI_DMA_FROMDEVICE this flush is not necessary for the - * simple map/unmap case. However, it IS necessary if if - * pci_dma_sync_single_* has been called and the buffer reused. + * fdc: The data cache line is written back to memory, if and only if + * it is dirty, and then invalidated from the data cache. */ - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); - return; + flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size); } -static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) +void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { - int i; - - BUG_ON(direction == DMA_NONE); + unsigned long addr = (unsigned long) phys_to_virt(paddr); - for (i = 0; i < nents; i++, sglist++ ) { - unsigned long vaddr = sg_virt_addr(sglist); - sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); - sg_dma_len(sglist) = sglist->length; - flush_kernel_dcache_range(vaddr, sglist->length); + switch (dir) { + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + flush_kernel_dcache_range(addr, size); + return; + case DMA_FROM_DEVICE: + purge_kernel_dcache_range_asm(addr, addr + size); + return; + default: + BUG(); } - return nents; -} - -static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - BUG_ON(direction == DMA_NONE); - - if (direction == DMA_TO_DEVICE) - return; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); - return; } - -static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); -} - -static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); -} - -static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); -} - -static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); -} - -struct hppa_dma_ops pcxl_dma_ops = { - .dma_supported = pa11_dma_supported, - .alloc_consistent = pa11_dma_alloc_consistent, - .alloc_noncoherent = pa11_dma_alloc_consistent, - .free_consistent = pa11_dma_free_consistent, - .map_single = pa11_dma_map_single, - .unmap_single = pa11_dma_unmap_single, - .map_sg = pa11_dma_map_sg, - .unmap_sg = pa11_dma_unmap_sg, - .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, - .dma_sync_single_for_device = pa11_dma_sync_single_for_device, - .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, - .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, -}; - -static void *fail_alloc_consistent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - return NULL; -} - -static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - void *addr; - - addr = (void *)__get_free_pages(flag, get_order(size)); - if (addr) - *dma_handle = (dma_addr_t)virt_to_phys(addr); - - return addr; -} - -static void pa11_dma_free_noncoherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t iova) -{ - free_pages((unsigned long)vaddr, get_order(size)); - return; -} - -struct hppa_dma_ops pcx_dma_ops = { - .dma_supported = pa11_dma_supported, - .alloc_consistent = fail_alloc_consistent, - .alloc_noncoherent = pa11_dma_alloc_noncoherent, - .free_consistent = pa11_dma_free_noncoherent, - .map_single = pa11_dma_map_single, - .unmap_single = pa11_dma_unmap_single, - .map_sg = pa11_dma_map_sg, - .unmap_sg = pa11_dma_unmap_sg, - .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, - .dma_sync_single_for_device = pa11_dma_sync_single_for_device, - .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, - .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, -}; |