2  * iommu.c:  IOMMU specific routines for memory management.
27 #include <asm/iommu.h>
61 	struct iommu_struct *iommu;  in sbus_iommu_init()  local
66 	iommu = kmalloc(sizeof(struct iommu_struct), GFP_KERNEL);  in sbus_iommu_init()
67 	if (!iommu) {  in sbus_iommu_init()
68 		prom_printf("Unable to allocate iommu structure\n");  in sbus_iommu_init()
72 	iommu->regs = of_ioremap(&op->resource[0], 0, PAGE_SIZE * 3,  in sbus_iommu_init()
74 	if (!iommu->regs) {  in sbus_iommu_init()
75 		prom_printf("Cannot map IOMMU registers\n");  in sbus_iommu_init()
78 	impl = (iommu->regs->control & IOMMU_CTRL_IMPL) >> 28;  in sbus_iommu_init()
79 	vers = (iommu->regs->control & IOMMU_CTRL_VERS) >> 24;  in sbus_iommu_init()
80 	tmp = iommu->regs->control;  in sbus_iommu_init()
83 	iommu->regs->control = tmp;  in sbus_iommu_init()
84 	iommu_invalidate(iommu->regs);  in sbus_iommu_init()
85 	iommu->start = IOMMU_START;  in sbus_iommu_init()
86 	iommu->end = 0xffffffff;  in sbus_iommu_init()
88 	/* Allocate IOMMU page table */  in sbus_iommu_init()
95 		prom_printf("Unable to allocate iommu table [0x%08x]\n",  in sbus_iommu_init()
99 	iommu->page_table = (iopte_t *)tmp;  in sbus_iommu_init()
102 	memset(iommu->page_table, 0, IOMMU_NPTES*sizeof(iopte_t));  in sbus_iommu_init()
105 	iommu->regs->base = __pa((unsigned long) iommu->page_table) >> 4;  in sbus_iommu_init()
106 	iommu_invalidate(iommu->regs);  in sbus_iommu_init()
110 		prom_printf("Unable to allocate iommu bitmap [%d]\n",  in sbus_iommu_init()
114 	bit_map_init(&iommu->usemap, bitmap, IOMMU_NPTES);  in sbus_iommu_init()
119 		iommu->usemap.num_colors = vac_cache_size >> PAGE_SHIFT;  in sbus_iommu_init()
121 		iommu->usemap.num_colors = 1;  in sbus_iommu_init()
123 	printk(KERN_INFO "IOMMU: impl %d vers %d table 0x%p[%d B] map [%d b]\n",  in sbus_iommu_init()
124 	       impl, vers, iommu->page_table,  in sbus_iommu_init()
127 	op->dev.archdata.iommu = iommu;  in sbus_iommu_init()
134 	for_each_node_by_name(dp, "iommu") {  in iommu_init()
177 	struct iommu_struct *iommu = dev->archdata.iommu;  in iommu_get_one()  local
184 	ioptex = bit_map_string_get(&iommu->usemap, npages, page_to_pfn(page));  in iommu_get_one()
186 		panic("iommu out");  in iommu_get_one()
187 	busa0 = iommu->start + (ioptex << PAGE_SHIFT);  in iommu_get_one()
188 	iopte0 = &iommu->page_table[ioptex];  in iommu_get_one()
194 		iommu_invalidate_page(iommu->regs, busa);  in iommu_get_one()
301 	struct iommu_struct *iommu = dev->archdata.iommu;  in iommu_release_one()  local
305 	BUG_ON(busa < iommu->start);  in iommu_release_one()
306 	ioptex = (busa - iommu->start) >> PAGE_SHIFT;  in iommu_release_one()
308 		iopte_val(iommu->page_table[ioptex + i]) = 0;  in iommu_release_one()
309 		iommu_invalidate_page(iommu->regs, busa);  in iommu_release_one()
312 	bit_map_clear(&iommu->usemap, ioptex, npages);  in iommu_release_one()
343 	struct iommu_struct *iommu = dev->archdata.iommu;  in iommu_map_dma_area()  local
345 	iopte_t *iopte = iommu->page_table;  in iommu_map_dma_area()
354 	ioptex = bit_map_string_get(&iommu->usemap, len >> PAGE_SHIFT,  in iommu_map_dma_area()
357 		panic("iommu out");  in iommu_map_dma_area()
394 	 *        IOMMU page table modifications, and usage of non-cacheable  in iommu_map_dma_area()
401 	iommu_invalidate(iommu->regs);  in iommu_map_dma_area()
403 	*pba = iommu->start + (ioptex << PAGE_SHIFT);  in iommu_map_dma_area()
409 	struct iommu_struct *iommu = dev->archdata.iommu;  in iommu_unmap_dma_area()  local
410 	iopte_t *iopte = iommu->page_table;  in iommu_unmap_dma_area()
412 	int ioptex = (busa - iommu->start) >> PAGE_SHIFT;  in iommu_unmap_dma_area()
424 	iommu_invalidate(iommu->regs);  in iommu_unmap_dma_area()
425 	bit_map_clear(&iommu->usemap, ioptex, len >> PAGE_SHIFT);  in iommu_unmap_dma_area()