2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
7 #ifdef CONFIG_ROCKCHIP_IOMMU_DEBUG
11 #include <linux/kernel.h>
12 #include <linux/hardirq.h>
13 #include <linux/slab.h>
14 #include <linux/scatterlist.h>
15 #include <linux/err.h>
18 #include <linux/of_platform.h>
20 #include "rockchip-iommu.h"
22 static struct rk_vm_region *find_region(struct rk_iovmm *vmm, dma_addr_t iova)
24 struct rk_vm_region *region;
26 list_for_each_entry(region, &vmm->regions_list, node)
27 if (region->start == iova)
33 int iovmm_activate(struct device *dev)
35 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
37 return iommu_attach_device(vmm->domain, dev);
40 void iovmm_deactivate(struct device *dev)
42 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
44 iommu_detach_device(vmm->domain, dev);
47 dma_addr_t iovmm_map(struct device *dev,struct scatterlist *sg, off_t offset,size_t size)
50 dma_addr_t addr, start = 0;
51 size_t mapped_size = 0;
52 struct rk_vm_region *region;
53 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
57 for (; sg_dma_len(sg) < offset; sg = sg_next(sg))
58 offset -= sg_dma_len(sg);
60 start_off = offset_in_page(sg_phys(sg) + offset);
61 size = PAGE_ALIGN(size + start_off);
63 order = __fls(min_t(size_t, size, SZ_1M));
65 region = kmalloc(sizeof(*region), GFP_KERNEL);
72 start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool, size);
87 /* if back to back sg entries are contiguous consolidate them */
88 while (sg_next(sg) &&sg_phys(sg) + sg_dma_len(sg) == sg_phys(sg_next(sg)))
90 len += sg_dma_len(sg_next(sg));
101 if (offset_in_page(phys))
103 len += offset_in_page(phys);
104 phys = round_down(phys, PAGE_SIZE);
107 len = PAGE_ALIGN(len);
109 if (len > (size - mapped_size))
110 len = size - mapped_size;
112 ret = iommu_map(vmm->domain, addr, phys, len, 0);
118 } while ((sg = sg_next(sg)) && (mapped_size < size));
120 BUG_ON(mapped_size > size);
122 if (mapped_size < size)
125 region->start = start + start_off;
128 INIT_LIST_HEAD(®ion->node);
130 spin_lock(&vmm->lock);
132 list_add(®ion->node, &vmm->regions_list);
134 spin_unlock(&vmm->lock);
136 rockchip_sysmmu_tlb_invalidate(dev);
138 pr_err("IOVMM: Allocated VM region @ %#x/%#X bytes.\n",region->start, region->size);
140 return region->start;
143 iommu_unmap(vmm->domain, start, mapped_size);
144 gen_pool_free(vmm->vmm_pool, start, size);
148 pr_err("IOVMM: Failed to allocated VM region for %#x bytes.\n",size);
149 return (dma_addr_t)ret;
152 void iovmm_unmap(struct device *dev, dma_addr_t iova)
154 struct rk_vm_region *region;
155 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
156 size_t unmapped_size;
158 /* This function must not be called in IRQ handlers */
161 spin_lock(&vmm->lock);
163 region = find_region(vmm, iova);
164 if (WARN_ON(!region))
166 spin_unlock(&vmm->lock);
170 list_del(®ion->node);
172 spin_unlock(&vmm->lock);
174 region->start = round_down(region->start, PAGE_SIZE);
176 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
178 rockchip_sysmmu_tlb_invalidate(dev);
180 gen_pool_free(vmm->vmm_pool, region->start, region->size);
182 WARN_ON(unmapped_size != region->size);
184 pr_err("IOVMM: Unmapped %#x bytes from %#x.\n",unmapped_size, region->start);
189 int iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
191 struct rk_vm_region *region;
192 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
195 if (WARN_ON((phys + size) >= IOVA_START))
197 pr_err("Unable to create one to one mapping for %#x @ %#x\n",size, phys);
201 region = kmalloc(sizeof(*region), GFP_KERNEL);
205 if (WARN_ON(phys & ~PAGE_MASK))
206 phys = round_down(phys, PAGE_SIZE);
209 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
216 region->start = (dma_addr_t)phys;
218 INIT_LIST_HEAD(®ion->node);
220 spin_lock(&vmm->lock);
222 list_add(®ion->node, &vmm->regions_list);
224 spin_unlock(&vmm->lock);
226 rockchip_sysmmu_tlb_invalidate(dev);
231 void iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
233 struct rk_vm_region *region;
234 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
235 size_t unmapped_size;
237 /* This function must not be called in IRQ handlers */
240 if (WARN_ON(phys & ~PAGE_MASK))
241 phys = round_down(phys, PAGE_SIZE);
243 spin_lock(&vmm->lock);
245 region = find_region(vmm, (dma_addr_t)phys);
246 if (WARN_ON(!region))
248 spin_unlock(&vmm->lock);
252 list_del(®ion->node);
254 spin_unlock(&vmm->lock);
256 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
257 rockchip_sysmmu_tlb_invalidate(dev);
258 WARN_ON(unmapped_size != region->size);
259 pr_err("IOVMM: Unmapped %#x bytes from %#x.\n",unmapped_size, region->start);
264 int rockchip_init_iovmm(struct device *sysmmu, struct rk_iovmm *vmm)
268 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
272 goto err_setup_genalloc;
275 /* (1GB - 4KB) addr space from 0x10000000 */
276 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
278 goto err_setup_domain;
280 vmm->domain = iommu_domain_alloc(&platform_bus_type);
284 goto err_setup_domain;
287 spin_lock_init(&vmm->lock);
289 INIT_LIST_HEAD(&vmm->regions_list);
291 pr_info("IOVMM: Created %#x B IOVMM from %#x.\n",IOVM_SIZE, IOVA_START);
294 gen_pool_destroy(vmm->vmm_pool);
296 pr_err("IOVMM: Failed to create IOVMM (%d)\n", ret);
302 1,success : pointer to the device inside of platform device
305 struct device *rockchip_get_sysmmu_device_by_compatible(const char *compt)
307 struct device_node *dn = NULL;
308 struct platform_device *pd = NULL;
309 struct device *ret = NULL ;
312 dn = of_find_node_by_name(NULL,name);
315 dn = of_find_compatible_node(NULL,NULL,compt);
318 pr_err("can't find device node %s \r\n",compt);
322 pd = of_find_device_by_node(dn);
325 pr_err("can't find platform device in device node %s \r\n",compt);