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2bcb5733 HD |
1 | /* |
2 | * omap iommu: omap2/3 architecture specific functions | |
3 | * | |
4 | * Copyright (C) 2008-2009 Nokia Corporation | |
5 | * | |
6 | * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>, | |
7 | * Paul Mundt and Toshihiro Kobayashi | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/err.h> | |
15 | #include <linux/device.h> | |
ed1c7de2 | 16 | #include <linux/io.h> |
2bcb5733 HD |
17 | #include <linux/jiffies.h> |
18 | #include <linux/module.h> | |
c8d35c84 | 19 | #include <linux/omap-iommu.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
2bcb5733 | 21 | #include <linux/stringify.h> |
2ab7c848 | 22 | #include <linux/platform_data/iommu-omap.h> |
2bcb5733 | 23 | |
ed1c7de2 | 24 | #include "omap-iommu.h" |
2bcb5733 HD |
25 | |
26 | /* | |
27 | * omap2 architecture specific register bit definitions | |
28 | */ | |
29 | #define IOMMU_ARCH_VERSION 0x00000011 | |
30 | ||
2bcb5733 HD |
31 | /* IRQSTATUS & IRQENABLE */ |
32 | #define MMU_IRQ_MULTIHITFAULT (1 << 4) | |
33 | #define MMU_IRQ_TABLEWALKFAULT (1 << 3) | |
34 | #define MMU_IRQ_EMUMISS (1 << 2) | |
35 | #define MMU_IRQ_TRANSLATIONFAULT (1 << 1) | |
36 | #define MMU_IRQ_TLBMISS (1 << 0) | |
993dd17e KH |
37 | |
38 | #define __MMU_IRQ_FAULT \ | |
39 | (MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT) | |
40 | #define MMU_IRQ_MASK \ | |
41 | (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS) | |
42 | #define MMU_IRQ_TWL_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT) | |
43 | #define MMU_IRQ_TLB_MISS_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS) | |
2bcb5733 HD |
44 | |
45 | /* MMU_CNTL */ | |
46 | #define MMU_CNTL_SHIFT 1 | |
47 | #define MMU_CNTL_MASK (7 << MMU_CNTL_SHIFT) | |
48 | #define MMU_CNTL_EML_TLB (1 << 3) | |
49 | #define MMU_CNTL_TWL_EN (1 << 2) | |
50 | #define MMU_CNTL_MMU_EN (1 << 1) | |
51 | ||
52 | #define get_cam_va_mask(pgsz) \ | |
53 | (((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 : \ | |
54 | ((pgsz) == MMU_CAM_PGSZ_1M) ? 0xfff00000 : \ | |
55 | ((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \ | |
56 | ((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0) | |
57 | ||
7bd9e25f IY |
58 | /* IOMMU errors */ |
59 | #define OMAP_IOMMU_ERR_TLB_MISS (1 << 0) | |
60 | #define OMAP_IOMMU_ERR_TRANS_FAULT (1 << 1) | |
61 | #define OMAP_IOMMU_ERR_EMU_MISS (1 << 2) | |
62 | #define OMAP_IOMMU_ERR_TBLWALK_FAULT (1 << 3) | |
63 | #define OMAP_IOMMU_ERR_MULTIHIT_FAULT (1 << 4) | |
ddfa975a | 64 | |
6c32df43 | 65 | static void __iommu_set_twl(struct omap_iommu *obj, bool on) |
ddfa975a KH |
66 | { |
67 | u32 l = iommu_read_reg(obj, MMU_CNTL); | |
68 | ||
69 | if (on) | |
70 | iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE); | |
71 | else | |
72 | iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE); | |
73 | ||
74 | l &= ~MMU_CNTL_MASK; | |
75 | if (on) | |
76 | l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN); | |
77 | else | |
78 | l |= (MMU_CNTL_MMU_EN); | |
79 | ||
80 | iommu_write_reg(obj, l, MMU_CNTL); | |
81 | } | |
82 | ||
83 | ||
6c32df43 | 84 | static int omap2_iommu_enable(struct omap_iommu *obj) |
2bcb5733 HD |
85 | { |
86 | u32 l, pa; | |
2bcb5733 HD |
87 | |
88 | if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K)) | |
89 | return -EINVAL; | |
90 | ||
91 | pa = virt_to_phys(obj->iopgd); | |
92 | if (!IS_ALIGNED(pa, SZ_16K)) | |
93 | return -EINVAL; | |
94 | ||
2bcb5733 HD |
95 | l = iommu_read_reg(obj, MMU_REVISION); |
96 | dev_info(obj->dev, "%s: version %d.%d\n", obj->name, | |
97 | (l >> 4) & 0xf, l & 0xf); | |
98 | ||
2bcb5733 HD |
99 | iommu_write_reg(obj, pa, MMU_TTB); |
100 | ||
ddfa975a | 101 | __iommu_set_twl(obj, true); |
2bcb5733 HD |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
6c32df43 | 106 | static void omap2_iommu_disable(struct omap_iommu *obj) |
2bcb5733 HD |
107 | { |
108 | u32 l = iommu_read_reg(obj, MMU_CNTL); | |
109 | ||
110 | l &= ~MMU_CNTL_MASK; | |
111 | iommu_write_reg(obj, l, MMU_CNTL); | |
2bcb5733 HD |
112 | |
113 | dev_dbg(obj->dev, "%s is shutting down\n", obj->name); | |
114 | } | |
115 | ||
6c32df43 | 116 | static void omap2_iommu_set_twl(struct omap_iommu *obj, bool on) |
ddfa975a KH |
117 | { |
118 | __iommu_set_twl(obj, false); | |
119 | } | |
120 | ||
6c32df43 | 121 | static u32 omap2_iommu_fault_isr(struct omap_iommu *obj, u32 *ra) |
2bcb5733 | 122 | { |
2bcb5733 | 123 | u32 stat, da; |
d594f1f3 | 124 | u32 errs = 0; |
2bcb5733 HD |
125 | |
126 | stat = iommu_read_reg(obj, MMU_IRQSTATUS); | |
127 | stat &= MMU_IRQ_MASK; | |
d594f1f3 DC |
128 | if (!stat) { |
129 | *ra = 0; | |
2bcb5733 | 130 | return 0; |
d594f1f3 | 131 | } |
2bcb5733 HD |
132 | |
133 | da = iommu_read_reg(obj, MMU_FAULT_AD); | |
134 | *ra = da; | |
135 | ||
d594f1f3 DC |
136 | if (stat & MMU_IRQ_TLBMISS) |
137 | errs |= OMAP_IOMMU_ERR_TLB_MISS; | |
138 | if (stat & MMU_IRQ_TRANSLATIONFAULT) | |
139 | errs |= OMAP_IOMMU_ERR_TRANS_FAULT; | |
140 | if (stat & MMU_IRQ_EMUMISS) | |
141 | errs |= OMAP_IOMMU_ERR_EMU_MISS; | |
142 | if (stat & MMU_IRQ_TABLEWALKFAULT) | |
143 | errs |= OMAP_IOMMU_ERR_TBLWALK_FAULT; | |
144 | if (stat & MMU_IRQ_MULTIHITFAULT) | |
145 | errs |= OMAP_IOMMU_ERR_MULTIHIT_FAULT; | |
2bcb5733 | 146 | iommu_write_reg(obj, stat, MMU_IRQSTATUS); |
37b29810 | 147 | |
d594f1f3 | 148 | return errs; |
2bcb5733 HD |
149 | } |
150 | ||
6c32df43 | 151 | static void omap2_tlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr) |
2bcb5733 HD |
152 | { |
153 | cr->cam = iommu_read_reg(obj, MMU_READ_CAM); | |
154 | cr->ram = iommu_read_reg(obj, MMU_READ_RAM); | |
155 | } | |
156 | ||
6c32df43 | 157 | static void omap2_tlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr) |
2bcb5733 HD |
158 | { |
159 | iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM); | |
160 | iommu_write_reg(obj, cr->ram, MMU_RAM); | |
161 | } | |
162 | ||
163 | static u32 omap2_cr_to_virt(struct cr_regs *cr) | |
164 | { | |
165 | u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK; | |
166 | u32 mask = get_cam_va_mask(cr->cam & page_size); | |
167 | ||
168 | return cr->cam & mask; | |
169 | } | |
170 | ||
6c32df43 OBC |
171 | static struct cr_regs *omap2_alloc_cr(struct omap_iommu *obj, |
172 | struct iotlb_entry *e) | |
2bcb5733 HD |
173 | { |
174 | struct cr_regs *cr; | |
175 | ||
176 | if (e->da & ~(get_cam_va_mask(e->pgsz))) { | |
177 | dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__, | |
178 | e->da); | |
179 | return ERR_PTR(-EINVAL); | |
180 | } | |
181 | ||
182 | cr = kmalloc(sizeof(*cr), GFP_KERNEL); | |
183 | if (!cr) | |
184 | return ERR_PTR(-ENOMEM); | |
185 | ||
77bc5abb | 186 | cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid; |
2bcb5733 HD |
187 | cr->ram = e->pa | e->endian | e->elsz | e->mixed; |
188 | ||
189 | return cr; | |
190 | } | |
191 | ||
192 | static inline int omap2_cr_valid(struct cr_regs *cr) | |
193 | { | |
194 | return cr->cam & MMU_CAM_V; | |
195 | } | |
196 | ||
197 | static u32 omap2_get_pte_attr(struct iotlb_entry *e) | |
198 | { | |
199 | u32 attr; | |
200 | ||
201 | attr = e->mixed << 5; | |
202 | attr |= e->endian; | |
203 | attr |= e->elsz >> 3; | |
7e20b6f3 SA |
204 | attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) || |
205 | (e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6); | |
2bcb5733 HD |
206 | return attr; |
207 | } | |
208 | ||
6c32df43 OBC |
209 | static ssize_t |
210 | omap2_dump_cr(struct omap_iommu *obj, struct cr_regs *cr, char *buf) | |
2bcb5733 HD |
211 | { |
212 | char *p = buf; | |
213 | ||
214 | /* FIXME: Need more detail analysis of cam/ram */ | |
be6d8026 KH |
215 | p += sprintf(p, "%08x %08x %01x\n", cr->cam, cr->ram, |
216 | (cr->cam & MMU_CAM_P) ? 1 : 0); | |
2bcb5733 HD |
217 | |
218 | return p - buf; | |
219 | } | |
220 | ||
221 | #define pr_reg(name) \ | |
14e0e679 HD |
222 | do { \ |
223 | ssize_t bytes; \ | |
224 | const char *str = "%20s: %08x\n"; \ | |
225 | const int maxcol = 32; \ | |
226 | bytes = snprintf(p, maxcol, str, __stringify(name), \ | |
227 | iommu_read_reg(obj, MMU_##name)); \ | |
228 | p += bytes; \ | |
229 | len -= bytes; \ | |
230 | if (len < maxcol) \ | |
231 | goto out; \ | |
232 | } while (0) | |
233 | ||
6c32df43 OBC |
234 | static ssize_t |
235 | omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len) | |
2bcb5733 HD |
236 | { |
237 | char *p = buf; | |
238 | ||
239 | pr_reg(REVISION); | |
2bcb5733 HD |
240 | pr_reg(IRQSTATUS); |
241 | pr_reg(IRQENABLE); | |
242 | pr_reg(WALKING_ST); | |
243 | pr_reg(CNTL); | |
244 | pr_reg(FAULT_AD); | |
245 | pr_reg(TTB); | |
246 | pr_reg(LOCK); | |
247 | pr_reg(LD_TLB); | |
248 | pr_reg(CAM); | |
249 | pr_reg(RAM); | |
250 | pr_reg(GFLUSH); | |
251 | pr_reg(FLUSH_ENTRY); | |
252 | pr_reg(READ_CAM); | |
253 | pr_reg(READ_RAM); | |
254 | pr_reg(EMU_FAULT_AD); | |
14e0e679 | 255 | out: |
2bcb5733 HD |
256 | return p - buf; |
257 | } | |
258 | ||
6c32df43 | 259 | static void omap2_iommu_save_ctx(struct omap_iommu *obj) |
2bcb5733 HD |
260 | { |
261 | int i; | |
262 | u32 *p = obj->ctx; | |
263 | ||
264 | for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { | |
265 | p[i] = iommu_read_reg(obj, i * sizeof(u32)); | |
266 | dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]); | |
267 | } | |
268 | ||
269 | BUG_ON(p[0] != IOMMU_ARCH_VERSION); | |
270 | } | |
271 | ||
6c32df43 | 272 | static void omap2_iommu_restore_ctx(struct omap_iommu *obj) |
2bcb5733 HD |
273 | { |
274 | int i; | |
275 | u32 *p = obj->ctx; | |
276 | ||
277 | for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { | |
278 | iommu_write_reg(obj, p[i], i * sizeof(u32)); | |
279 | dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]); | |
280 | } | |
281 | ||
282 | BUG_ON(p[0] != IOMMU_ARCH_VERSION); | |
283 | } | |
284 | ||
285 | static void omap2_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e) | |
286 | { | |
287 | e->da = cr->cam & MMU_CAM_VATAG_MASK; | |
288 | e->pa = cr->ram & MMU_RAM_PADDR_MASK; | |
289 | e->valid = cr->cam & MMU_CAM_V; | |
290 | e->pgsz = cr->cam & MMU_CAM_PGSZ_MASK; | |
291 | e->endian = cr->ram & MMU_RAM_ENDIAN_MASK; | |
292 | e->elsz = cr->ram & MMU_RAM_ELSZ_MASK; | |
293 | e->mixed = cr->ram & MMU_RAM_MIXED; | |
294 | } | |
295 | ||
296 | static const struct iommu_functions omap2_iommu_ops = { | |
297 | .version = IOMMU_ARCH_VERSION, | |
298 | ||
299 | .enable = omap2_iommu_enable, | |
300 | .disable = omap2_iommu_disable, | |
ddfa975a | 301 | .set_twl = omap2_iommu_set_twl, |
2bcb5733 HD |
302 | .fault_isr = omap2_iommu_fault_isr, |
303 | ||
304 | .tlb_read_cr = omap2_tlb_read_cr, | |
305 | .tlb_load_cr = omap2_tlb_load_cr, | |
306 | ||
307 | .cr_to_e = omap2_cr_to_e, | |
308 | .cr_to_virt = omap2_cr_to_virt, | |
309 | .alloc_cr = omap2_alloc_cr, | |
310 | .cr_valid = omap2_cr_valid, | |
311 | .dump_cr = omap2_dump_cr, | |
312 | ||
313 | .get_pte_attr = omap2_get_pte_attr, | |
314 | ||
315 | .save_ctx = omap2_iommu_save_ctx, | |
316 | .restore_ctx = omap2_iommu_restore_ctx, | |
317 | .dump_ctx = omap2_iommu_dump_ctx, | |
318 | }; | |
319 | ||
320 | static int __init omap2_iommu_init(void) | |
321 | { | |
6c32df43 | 322 | return omap_install_iommu_arch(&omap2_iommu_ops); |
2bcb5733 HD |
323 | } |
324 | module_init(omap2_iommu_init); | |
325 | ||
326 | static void __exit omap2_iommu_exit(void) | |
327 | { | |
6c32df43 | 328 | omap_uninstall_iommu_arch(&omap2_iommu_ops); |
2bcb5733 HD |
329 | } |
330 | module_exit(omap2_iommu_exit); | |
331 | ||
332 | MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi"); | |
333 | MODULE_DESCRIPTION("omap iommu: omap2/3 architecture specific functions"); | |
334 | MODULE_LICENSE("GPL v2"); |