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/* $Id: io-unit.c,v 1.10 1998/03/03 12:31:14 jj 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/malloc.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>
#include <asm/io.h>
#include <asm/io-unit.h>
#include <asm/mxcc.h>
#include <asm/spinlock.h>
#include <asm/bitops.h>
/* #define IOUNIT_DEBUG */
#ifdef IOUNIT_DEBUG
#define IOD(x) printk(x)
#else
#define IOD(x) do { } while (0)
#endif
#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
__initfunc(unsigned long
iounit_init(int sbi_node, int io_node, unsigned long memory_start,
unsigned long memory_end, struct linux_sbus *sbus))
{
iopte_t *xpt, *xptend;
struct iounit_struct *iounit;
struct linux_prom_registers iommu_promregs[PROMREG_MAX];
memory_start = LONG_ALIGN(memory_start);
iounit = (struct iounit_struct *)memory_start;
memory_start = LONG_ALIGN(memory_start + sizeof(struct iounit_struct));
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;
prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
sizeof(iommu_promregs));
prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
xpt = (iopte_t *)
sparc_alloc_io(iommu_promregs[2].phys_addr, 0, (PAGE_SIZE * 16),
"XPT", iommu_promregs[2].which_io, 0x0);
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;)
*xpt++ = 0;
return memory_start;
}
/* 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(mmu_v2p(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 linux_sbus *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 mmu_sglist *sg, int sz, struct linux_sbus *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);
for (; sz >= 0; sz--) {
sg[sz].dvma_addr = iounit_get_area(iounit, (unsigned long)sg[sz].addr, sg[sz].len);
}
spin_unlock_irqrestore(&iounit->lock, flags);
}
static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct linux_sbus *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 mmu_sglist *sg, int sz, struct linux_sbus *sbus)
{
unsigned long flags;
unsigned long vaddr, len;
struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
spin_lock_irqsave(&iounit->lock, flags);
for (; sz >= 0; sz--) {
len = ((sg[sz].dvma_addr & ~PAGE_MASK) + sg[sz].len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
vaddr = (sg[sz].dvma_addr - 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 void iounit_map_dma_area(unsigned long addr, int len)
{
unsigned long page, end;
pgprot_t dvma_prot;
iopte_t *iopte;
struct linux_sbus *sbus;
dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
end = PAGE_ALIGN((addr + len));
while(addr < end) {
page = get_free_page(GFP_KERNEL);
if(!page) {
prom_printf("alloc_dvma: Cannot get a dvma page\n");
prom_halt();
} else {
pgd_t *pgdp;
pmd_t *pmdp;
pte_t *ptep;
long i;
pgdp = pgd_offset(init_task.mm, addr);
pmdp = pmd_offset(pgdp, addr);
ptep = pte_offset(pmdp, addr);
set_pte(ptep, pte_val(mk_pte(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 = __iopte(MKIOPTE(mmu_v2p(page)));
}
}
addr += PAGE_SIZE;
}
flush_cache_all();
flush_tlb_all();
}
#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 */
}
__initfunc(void 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);
#endif
}
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