diff options
Diffstat (limited to 'arch/sparc/mm/io-unit.c')
| -rw-r--r-- | arch/sparc/mm/io-unit.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c new file mode 100644 index 000000000000..eefffa1dc5de --- /dev/null +++ b/arch/sparc/mm/io-unit.c @@ -0,0 +1,318 @@ +/* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $ + * io-unit.c: IO-UNIT specific routines for memory management. + * + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/mm.h> +#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */ +#include <linux/bitops.h> + +#include <asm/scatterlist.h> +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/sbus.h> +#include <asm/io.h> +#include <asm/io-unit.h> +#include <asm/mxcc.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include <asm/dma.h> + +/* #define IOUNIT_DEBUG */ +#ifdef IOUNIT_DEBUG +#define IOD(x) printk(x) +#else +#define IOD(x) do { } while (0) +#endif + +#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID) +#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM) + +void __init +iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus) +{ + iopte_t *xpt, *xptend; + struct iounit_struct *iounit; + struct linux_prom_registers iommu_promregs[PROMREG_MAX]; + struct resource r; + + iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC); + + memset(iounit, 0, sizeof(*iounit)); + iounit->limit[0] = IOUNIT_BMAP1_START; + iounit->limit[1] = IOUNIT_BMAP2_START; + iounit->limit[2] = IOUNIT_BMAPM_START; + iounit->limit[3] = IOUNIT_BMAPM_END; + iounit->rotor[1] = IOUNIT_BMAP2_START; + iounit->rotor[2] = IOUNIT_BMAPM_START; + + xpt = NULL; + if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs, + sizeof(iommu_promregs)) != -1) { + prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3); + memset(&r, 0, sizeof(r)); + r.flags = iommu_promregs[2].which_io; + r.start = iommu_promregs[2].phys_addr; + xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT"); + } + if(!xpt) panic("Cannot map External Page Table."); + + sbus->iommu = (struct iommu_struct *)iounit; + iounit->page_table = xpt; + + for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t); + xpt < xptend;) + iopte_val(*xpt++) = 0; +} + +/* One has to hold iounit->lock to call this */ +static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size) +{ + int i, j, k, npages; + unsigned long rotor, scan, limit; + iopte_t iopte; + + npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; + + /* A tiny bit of magic ingredience :) */ + switch (npages) { + case 1: i = 0x0231; break; + case 2: i = 0x0132; break; + default: i = 0x0213; break; + } + + IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages)); + +next: j = (i & 15); + rotor = iounit->rotor[j - 1]; + limit = iounit->limit[j]; + scan = rotor; +nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); + if (scan + npages > limit) { + if (limit != rotor) { + limit = rotor; + scan = iounit->limit[j - 1]; + goto nexti; + } + i >>= 4; + if (!(i & 15)) + panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size); + goto next; + } + for (k = 1, scan++; k < npages; k++) + if (test_bit(scan++, iounit->bmap)) + goto nexti; + iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; + scan -= npages; + iopte = MKIOPTE(__pa(vaddr & PAGE_MASK)); + vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK); + for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) { + set_bit(scan, iounit->bmap); + iounit->page_table[scan] = iopte; + } + IOD(("%08lx\n", vaddr)); + return vaddr; +} + +static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus) +{ + unsigned long ret, flags; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + spin_lock_irqsave(&iounit->lock, flags); + ret = iounit_get_area(iounit, (unsigned long)vaddr, len); + spin_unlock_irqrestore(&iounit->lock, flags); + return ret; +} + +static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) +{ + unsigned long flags; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + /* FIXME: Cache some resolved pages - often several sg entries are to the same page */ + spin_lock_irqsave(&iounit->lock, flags); + while (sz != 0) { + --sz; + sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); + sg[sz].dvma_length = sg[sz].length; + } + spin_unlock_irqrestore(&iounit->lock, flags); +} + +static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus) +{ + unsigned long flags; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + spin_lock_irqsave(&iounit->lock, flags); + len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT; + vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; + IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); + for (len += vaddr; vaddr < len; vaddr++) + clear_bit(vaddr, iounit->bmap); + spin_unlock_irqrestore(&iounit->lock, flags); +} + +static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) +{ + unsigned long flags; + unsigned long vaddr, len; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + spin_lock_irqsave(&iounit->lock, flags); + while (sz != 0) { + --sz; + len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT; + vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT; + IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); + for (len += vaddr; vaddr < len; vaddr++) + clear_bit(vaddr, iounit->bmap); + } + spin_unlock_irqrestore(&iounit->lock, flags); +} + +#ifdef CONFIG_SBUS +static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len) +{ + unsigned long page, end; + pgprot_t dvma_prot; + iopte_t *iopte; + struct sbus_bus *sbus; + + *pba = addr; + + dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); + end = PAGE_ALIGN((addr + len)); + while(addr < end) { + page = va; + { + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + long i; + + pgdp = pgd_offset(&init_mm, addr); + pmdp = pmd_offset(pgdp, addr); + ptep = pte_offset_map(pmdp, addr); + + set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot)); + + i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); + + for_each_sbus(sbus) { + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + iopte = (iopte_t *)(iounit->page_table + i); + *iopte = MKIOPTE(__pa(page)); + } + } + addr += PAGE_SIZE; + va += PAGE_SIZE; + } + flush_cache_all(); + flush_tlb_all(); + + return 0; +} + +static void iounit_unmap_dma_area(unsigned long addr, int len) +{ + /* XXX Somebody please fill this in */ +} + +/* XXX We do not pass sbus device here, bad. */ +static struct page *iounit_translate_dvma(unsigned long addr) +{ + struct sbus_bus *sbus = sbus_root; /* They are all the same */ + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + int i; + iopte_t *iopte; + + i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); + iopte = (iopte_t *)(iounit->page_table + i); + return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */ +} +#endif + +static char *iounit_lockarea(char *vaddr, unsigned long len) +{ +/* FIXME: Write this */ + return vaddr; +} + +static void iounit_unlockarea(char *vaddr, unsigned long len) +{ +/* FIXME: Write this */ +} + +void __init ld_mmu_iounit(void) +{ + BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0); + BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP); + + BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM); + +#ifdef CONFIG_SBUS + BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM); +#endif +} + +__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size) +{ + int i, j, k, npages; + unsigned long rotor, scan, limit; + unsigned long flags; + __u32 ret; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT; + i = 0x0213; + spin_lock_irqsave(&iounit->lock, flags); +next: j = (i & 15); + rotor = iounit->rotor[j - 1]; + limit = iounit->limit[j]; + scan = rotor; +nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); + if (scan + npages > limit) { + if (limit != rotor) { + limit = rotor; + scan = iounit->limit[j - 1]; + goto nexti; + } + i >>= 4; + if (!(i & 15)) + panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size); + goto next; + } + for (k = 1, scan++; k < npages; k++) + if (test_bit(scan++, iounit->bmap)) + goto nexti; + iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; + scan -= npages; + ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT); + for (k = 0; k < npages; k++, scan++) + set_bit(scan, iounit->bmap); + spin_unlock_irqrestore(&iounit->lock, flags); + return ret; +} + +__u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus) +{ + int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; + struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; + + iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK)); + return vaddr + (((unsigned long)addr) & ~PAGE_MASK); +} |