diff options
Diffstat (limited to 'qemu/roms/openbios/drivers/iommu.c')
| -rw-r--r-- | qemu/roms/openbios/drivers/iommu.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/qemu/roms/openbios/drivers/iommu.c b/qemu/roms/openbios/drivers/iommu.c new file mode 100644 index 000000000..cd9a64bb6 --- /dev/null +++ b/qemu/roms/openbios/drivers/iommu.c @@ -0,0 +1,207 @@ +/** + ** Proll (PROM replacement) + ** iommu.c: Functions for DVMA management. + ** Copyright 1999 Pete Zaitcev + ** This code is licensed under GNU General Public License. + **/ +#include "config.h" +#include "libopenbios/bindings.h" +#include "libopenbios/ofmem.h" +#include "drivers/drivers.h" +#include "iommu.h" +#include "arch/sparc32/ofmem_sparc32.h" + +#ifdef CONFIG_DEBUG_IOMMU +#define DPRINTF(fmt, args...) \ + do { printk(fmt , ##args); } while (0) +#else +#define DPRINTF(fmt, args...) +#endif + +/* + * IOMMU parameters + */ +struct iommu { + struct iommu_regs *regs; + unsigned int *page_table; + unsigned long plow; /* Base bus address */ +}; + +static struct iommu ciommu; + +static void +iommu_invalidate(struct iommu_regs *iregs) +{ + iregs->tlbflush = 0; +} + +/* + * XXX This is a problematic interface. We alloc _memory_ which is uncached. + * So if we ever reuse allocations somebody is going to get uncached pages. + * Returned address is always aligned by page. + * BTW, we were not going to give away anonymous storage, were we not? + */ +void * +dvma_alloc(int size, unsigned int *pphys) +{ + void *va; + unsigned int pa, ba; + unsigned int npages; + unsigned int mva, mpa; + unsigned int i; + unsigned int *iopte; + struct iommu *t = &ciommu; + int ret; + + npages = (size + (PAGE_SIZE-1)) / PAGE_SIZE; + ret = ofmem_posix_memalign(&va, npages * PAGE_SIZE, PAGE_SIZE); + if (ret != 0) + return NULL; + + ba = (unsigned int)mem_alloc(&cdvmem, npages * PAGE_SIZE, PAGE_SIZE); + if (ba == 0) + return NULL; + + pa = (unsigned int)va2pa((unsigned long)va); + + /* + * Change page attributes in MMU to uncached. + */ + mva = (unsigned int) va; + mpa = (unsigned int) pa; + ofmem_arch_map_pages(mpa, mva, npages * PAGE_SIZE, ofmem_arch_io_translation_mode(mpa)); + + /* + * Map into IOMMU page table. + */ + mpa = (unsigned int) pa; + iopte = &t->page_table[(ba - t->plow) / PAGE_SIZE]; + for (i = 0; i < npages; i++) { + *iopte++ = MKIOPTE(mpa); + mpa += PAGE_SIZE; + } + + *pphys = ba; + + return va; +} + +/* + * Initialize IOMMU + * This looks like initialization of CPU MMU but + * the routine is higher in food chain. + */ +static struct iommu_regs * +iommu_init(struct iommu *t, uint64_t base) +{ + unsigned int *ptab; + int ptsize; +#ifdef CONFIG_DEBUG_IOMMU + unsigned int impl, vers; +#endif + unsigned int tmp; + struct iommu_regs *regs; + int ret; + unsigned long vasize; + + regs = (struct iommu_regs *)ofmem_map_io(base, IOMMU_REGS); + if (regs == NULL) { + DPRINTF("Cannot map IOMMU\n"); + for (;;) { } + } + t->regs = regs; +#ifdef CONFIG_DEBUG_IOMMU + impl = (regs->control & IOMMU_CTRL_IMPL) >> 28; + vers = (regs->control & IOMMU_CTRL_VERS) >> 24; +#endif + + tmp = regs->control; + tmp &= ~(IOMMU_CTRL_RNGE); + + tmp |= (IOMMU_RNGE_32MB | IOMMU_CTRL_ENAB); + t->plow = 0xfe000000; /* End - 32 MB */ + /* Size of VA region that we manage */ + vasize = 0x2000000; /* 32 MB */ + + regs->control = tmp; + iommu_invalidate(regs); + + /* Allocate IOMMU page table */ + /* Tremendous alignment causes great waste... */ + ptsize = (vasize / PAGE_SIZE) * sizeof(int); + ret = ofmem_posix_memalign((void *)&ptab, ptsize, ptsize); + if (ret != 0) { + DPRINTF("Cannot allocate IOMMU table [0x%x]\n", ptsize); + for (;;) { } + } + t->page_table = ptab; + + /* flush_cache_all(); */ + /** flush_tlb_all(); **/ + tmp = (unsigned int)va2pa((unsigned long)ptab); + regs->base = tmp >> 4; + iommu_invalidate(regs); + + DPRINTF("IOMMU: impl %d vers %d page table at 0x%p (pa 0x%x) of size %d bytes\n", + impl, vers, t->page_table, tmp, ptsize); + + mem_init(&cdvmem, (char*)t->plow, (char *)0xfffff000); + return regs; +} + +/* ( addr.lo addr.hi size -- virt ) */ + +static void +ob_iommu_map_in(void) +{ + phys_addr_t phys; + ucell size, virt; + + size = POP(); + phys = POP(); + phys = (phys << 32) + POP(); + + virt = ofmem_map_io(phys, size); + + PUSH(virt); +} + +/* ( virt size ) */ + +static void +ob_iommu_map_out(void) +{ + ucell size = POP(); + ucell virt = POP(); + + ofmem_release_io(virt, size); +} + +void +ob_init_iommu(uint64_t base) +{ + struct iommu_regs *regs; + + regs = iommu_init(&ciommu, base); + + push_str("/iommu"); + fword("find-device"); + PUSH((unsigned long)regs); + fword("encode-int"); + push_str("address"); + fword("property"); + + PUSH(base >> 32); + fword("encode-int"); + PUSH(base & 0xffffffff); + fword("encode-int"); + fword("encode+"); + PUSH(IOMMU_REGS); + fword("encode-int"); + fword("encode+"); + push_str("reg"); + fword("property"); + + bind_func("map-in", ob_iommu_map_in); + bind_func("map-out", ob_iommu_map_out); +} |