271 lines
7.2 KiB
C
271 lines
7.2 KiB
C
/*
|
|
* io-unit.c: IO-UNIT specific routines for memory management.
|
|
*
|
|
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
#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 <linux/scatterlist.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.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>
|
|
#include <asm/oplib.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)
|
|
|
|
static void __init iounit_iommu_init(struct platform_device *op)
|
|
{
|
|
struct iounit_struct *iounit;
|
|
iopte_t *xpt, *xptend;
|
|
|
|
iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
|
|
if (!iounit) {
|
|
prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
|
|
prom_halt();
|
|
}
|
|
|
|
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 = of_ioremap(&op->resource[2], 0, PAGE_SIZE * 16, "XPT");
|
|
if (!xpt) {
|
|
prom_printf("SUN4D: Cannot map External Page Table.");
|
|
prom_halt();
|
|
}
|
|
|
|
op->dev.archdata.iommu = iounit;
|
|
iounit->page_table = xpt;
|
|
spin_lock_init(&iounit->lock);
|
|
|
|
for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
|
|
xpt < xptend;)
|
|
iopte_val(*xpt++) = 0;
|
|
}
|
|
|
|
static int __init iounit_init(void)
|
|
{
|
|
extern void sun4d_init_sbi_irq(void);
|
|
struct device_node *dp;
|
|
|
|
for_each_node_by_name(dp, "sbi") {
|
|
struct platform_device *op = of_find_device_by_node(dp);
|
|
|
|
iounit_iommu_init(op);
|
|
of_propagate_archdata(op);
|
|
}
|
|
|
|
sun4d_init_sbi_irq();
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(iounit_init);
|
|
|
|
/* 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(struct device *dev, char *vaddr, unsigned long len)
|
|
{
|
|
struct iounit_struct *iounit = dev->archdata.iommu;
|
|
unsigned long ret, flags;
|
|
|
|
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 device *dev, struct scatterlist *sg, int sz)
|
|
{
|
|
struct iounit_struct *iounit = dev->archdata.iommu;
|
|
unsigned long flags;
|
|
|
|
/* 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->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
|
|
sg->dma_length = sg->length;
|
|
sg = sg_next(sg);
|
|
}
|
|
spin_unlock_irqrestore(&iounit->lock, flags);
|
|
}
|
|
|
|
static void iounit_release_scsi_one(struct device *dev, __u32 vaddr, unsigned long len)
|
|
{
|
|
struct iounit_struct *iounit = dev->archdata.iommu;
|
|
unsigned long flags;
|
|
|
|
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 device *dev, struct scatterlist *sg, int sz)
|
|
{
|
|
struct iounit_struct *iounit = dev->archdata.iommu;
|
|
unsigned long flags;
|
|
unsigned long vaddr, len;
|
|
|
|
spin_lock_irqsave(&iounit->lock, flags);
|
|
while (sz != 0) {
|
|
--sz;
|
|
len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
|
|
vaddr = (sg->dma_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);
|
|
sg = sg_next(sg);
|
|
}
|
|
spin_unlock_irqrestore(&iounit->lock, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_SBUS
|
|
static int iounit_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, __u32 addr, int len)
|
|
{
|
|
struct iounit_struct *iounit = dev->archdata.iommu;
|
|
unsigned long page, end;
|
|
pgprot_t dvma_prot;
|
|
iopte_t *iopte;
|
|
|
|
*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);
|
|
|
|
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(struct device *dev, unsigned long addr, int len)
|
|
{
|
|
/* XXX Somebody please fill this in */
|
|
}
|
|
#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);
|
|
#endif
|
|
}
|