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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> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/module.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
2bcb5733 HD |
19 | #include <linux/stringify.h> |
20 | ||
ce491cf8 | 21 | #include <plat/iommu.h> |
2bcb5733 HD |
22 | |
23 | /* | |
24 | * omap2 architecture specific register bit definitions | |
25 | */ | |
26 | #define IOMMU_ARCH_VERSION 0x00000011 | |
27 | ||
28 | /* SYSCONF */ | |
29 | #define MMU_SYS_IDLE_SHIFT 3 | |
30 | #define MMU_SYS_IDLE_FORCE (0 << MMU_SYS_IDLE_SHIFT) | |
31 | #define MMU_SYS_IDLE_NONE (1 << MMU_SYS_IDLE_SHIFT) | |
32 | #define MMU_SYS_IDLE_SMART (2 << MMU_SYS_IDLE_SHIFT) | |
33 | #define MMU_SYS_IDLE_MASK (3 << MMU_SYS_IDLE_SHIFT) | |
34 | ||
35 | #define MMU_SYS_SOFTRESET (1 << 1) | |
36 | #define MMU_SYS_AUTOIDLE 1 | |
37 | ||
38 | /* SYSSTATUS */ | |
39 | #define MMU_SYS_RESETDONE 1 | |
40 | ||
41 | /* IRQSTATUS & IRQENABLE */ | |
42 | #define MMU_IRQ_MULTIHITFAULT (1 << 4) | |
43 | #define MMU_IRQ_TABLEWALKFAULT (1 << 3) | |
44 | #define MMU_IRQ_EMUMISS (1 << 2) | |
45 | #define MMU_IRQ_TRANSLATIONFAULT (1 << 1) | |
46 | #define MMU_IRQ_TLBMISS (1 << 0) | |
993dd17e KH |
47 | |
48 | #define __MMU_IRQ_FAULT \ | |
49 | (MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT) | |
50 | #define MMU_IRQ_MASK \ | |
51 | (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS) | |
52 | #define MMU_IRQ_TWL_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT) | |
53 | #define MMU_IRQ_TLB_MISS_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS) | |
2bcb5733 HD |
54 | |
55 | /* MMU_CNTL */ | |
56 | #define MMU_CNTL_SHIFT 1 | |
57 | #define MMU_CNTL_MASK (7 << MMU_CNTL_SHIFT) | |
58 | #define MMU_CNTL_EML_TLB (1 << 3) | |
59 | #define MMU_CNTL_TWL_EN (1 << 2) | |
60 | #define MMU_CNTL_MMU_EN (1 << 1) | |
61 | ||
62 | #define get_cam_va_mask(pgsz) \ | |
63 | (((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 : \ | |
64 | ((pgsz) == MMU_CAM_PGSZ_1M) ? 0xfff00000 : \ | |
65 | ((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \ | |
66 | ((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0) | |
67 | ||
ddfa975a KH |
68 | |
69 | static void __iommu_set_twl(struct iommu *obj, bool on) | |
70 | { | |
71 | u32 l = iommu_read_reg(obj, MMU_CNTL); | |
72 | ||
73 | if (on) | |
74 | iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE); | |
75 | else | |
76 | iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE); | |
77 | ||
78 | l &= ~MMU_CNTL_MASK; | |
79 | if (on) | |
80 | l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN); | |
81 | else | |
82 | l |= (MMU_CNTL_MMU_EN); | |
83 | ||
84 | iommu_write_reg(obj, l, MMU_CNTL); | |
85 | } | |
86 | ||
87 | ||
2bcb5733 HD |
88 | static int omap2_iommu_enable(struct iommu *obj) |
89 | { | |
90 | u32 l, pa; | |
91 | unsigned long timeout; | |
92 | ||
93 | if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K)) | |
94 | return -EINVAL; | |
95 | ||
96 | pa = virt_to_phys(obj->iopgd); | |
97 | if (!IS_ALIGNED(pa, SZ_16K)) | |
98 | return -EINVAL; | |
99 | ||
100 | iommu_write_reg(obj, MMU_SYS_SOFTRESET, MMU_SYSCONFIG); | |
101 | ||
102 | timeout = jiffies + msecs_to_jiffies(20); | |
103 | do { | |
104 | l = iommu_read_reg(obj, MMU_SYSSTATUS); | |
105 | if (l & MMU_SYS_RESETDONE) | |
106 | break; | |
055c49d2 | 107 | } while (!time_after(jiffies, timeout)); |
2bcb5733 HD |
108 | |
109 | if (!(l & MMU_SYS_RESETDONE)) { | |
110 | dev_err(obj->dev, "can't take mmu out of reset\n"); | |
111 | return -ENODEV; | |
112 | } | |
113 | ||
114 | l = iommu_read_reg(obj, MMU_REVISION); | |
115 | dev_info(obj->dev, "%s: version %d.%d\n", obj->name, | |
116 | (l >> 4) & 0xf, l & 0xf); | |
117 | ||
118 | l = iommu_read_reg(obj, MMU_SYSCONFIG); | |
119 | l &= ~MMU_SYS_IDLE_MASK; | |
120 | l |= (MMU_SYS_IDLE_SMART | MMU_SYS_AUTOIDLE); | |
121 | iommu_write_reg(obj, l, MMU_SYSCONFIG); | |
122 | ||
2bcb5733 HD |
123 | iommu_write_reg(obj, pa, MMU_TTB); |
124 | ||
ddfa975a | 125 | __iommu_set_twl(obj, true); |
2bcb5733 HD |
126 | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static void omap2_iommu_disable(struct iommu *obj) | |
131 | { | |
132 | u32 l = iommu_read_reg(obj, MMU_CNTL); | |
133 | ||
134 | l &= ~MMU_CNTL_MASK; | |
135 | iommu_write_reg(obj, l, MMU_CNTL); | |
136 | iommu_write_reg(obj, MMU_SYS_IDLE_FORCE, MMU_SYSCONFIG); | |
137 | ||
138 | dev_dbg(obj->dev, "%s is shutting down\n", obj->name); | |
139 | } | |
140 | ||
ddfa975a KH |
141 | static void omap2_iommu_set_twl(struct iommu *obj, bool on) |
142 | { | |
143 | __iommu_set_twl(obj, false); | |
144 | } | |
145 | ||
2bcb5733 HD |
146 | static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra) |
147 | { | |
2bcb5733 | 148 | u32 stat, da; |
2bcb5733 HD |
149 | |
150 | stat = iommu_read_reg(obj, MMU_IRQSTATUS); | |
151 | stat &= MMU_IRQ_MASK; | |
152 | if (!stat) | |
153 | return 0; | |
154 | ||
155 | da = iommu_read_reg(obj, MMU_FAULT_AD); | |
156 | *ra = da; | |
157 | ||
2bcb5733 | 158 | iommu_write_reg(obj, stat, MMU_IRQSTATUS); |
37b29810 | 159 | |
2bcb5733 HD |
160 | return stat; |
161 | } | |
162 | ||
163 | static void omap2_tlb_read_cr(struct iommu *obj, struct cr_regs *cr) | |
164 | { | |
165 | cr->cam = iommu_read_reg(obj, MMU_READ_CAM); | |
166 | cr->ram = iommu_read_reg(obj, MMU_READ_RAM); | |
167 | } | |
168 | ||
169 | static void omap2_tlb_load_cr(struct iommu *obj, struct cr_regs *cr) | |
170 | { | |
171 | iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM); | |
172 | iommu_write_reg(obj, cr->ram, MMU_RAM); | |
173 | } | |
174 | ||
175 | static u32 omap2_cr_to_virt(struct cr_regs *cr) | |
176 | { | |
177 | u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK; | |
178 | u32 mask = get_cam_va_mask(cr->cam & page_size); | |
179 | ||
180 | return cr->cam & mask; | |
181 | } | |
182 | ||
183 | static struct cr_regs *omap2_alloc_cr(struct iommu *obj, struct iotlb_entry *e) | |
184 | { | |
185 | struct cr_regs *cr; | |
186 | ||
187 | if (e->da & ~(get_cam_va_mask(e->pgsz))) { | |
188 | dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__, | |
189 | e->da); | |
190 | return ERR_PTR(-EINVAL); | |
191 | } | |
192 | ||
193 | cr = kmalloc(sizeof(*cr), GFP_KERNEL); | |
194 | if (!cr) | |
195 | return ERR_PTR(-ENOMEM); | |
196 | ||
77bc5abb | 197 | cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid; |
2bcb5733 HD |
198 | cr->ram = e->pa | e->endian | e->elsz | e->mixed; |
199 | ||
200 | return cr; | |
201 | } | |
202 | ||
203 | static inline int omap2_cr_valid(struct cr_regs *cr) | |
204 | { | |
205 | return cr->cam & MMU_CAM_V; | |
206 | } | |
207 | ||
208 | static u32 omap2_get_pte_attr(struct iotlb_entry *e) | |
209 | { | |
210 | u32 attr; | |
211 | ||
212 | attr = e->mixed << 5; | |
213 | attr |= e->endian; | |
214 | attr |= e->elsz >> 3; | |
215 | attr <<= ((e->pgsz & MMU_CAM_PGSZ_4K) ? 0 : 6); | |
216 | ||
217 | return attr; | |
218 | } | |
219 | ||
220 | static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf) | |
221 | { | |
222 | char *p = buf; | |
223 | ||
224 | /* FIXME: Need more detail analysis of cam/ram */ | |
be6d8026 KH |
225 | p += sprintf(p, "%08x %08x %01x\n", cr->cam, cr->ram, |
226 | (cr->cam & MMU_CAM_P) ? 1 : 0); | |
2bcb5733 HD |
227 | |
228 | return p - buf; | |
229 | } | |
230 | ||
231 | #define pr_reg(name) \ | |
14e0e679 HD |
232 | do { \ |
233 | ssize_t bytes; \ | |
234 | const char *str = "%20s: %08x\n"; \ | |
235 | const int maxcol = 32; \ | |
236 | bytes = snprintf(p, maxcol, str, __stringify(name), \ | |
237 | iommu_read_reg(obj, MMU_##name)); \ | |
238 | p += bytes; \ | |
239 | len -= bytes; \ | |
240 | if (len < maxcol) \ | |
241 | goto out; \ | |
242 | } while (0) | |
243 | ||
244 | static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len) | |
2bcb5733 HD |
245 | { |
246 | char *p = buf; | |
247 | ||
248 | pr_reg(REVISION); | |
249 | pr_reg(SYSCONFIG); | |
250 | pr_reg(SYSSTATUS); | |
251 | pr_reg(IRQSTATUS); | |
252 | pr_reg(IRQENABLE); | |
253 | pr_reg(WALKING_ST); | |
254 | pr_reg(CNTL); | |
255 | pr_reg(FAULT_AD); | |
256 | pr_reg(TTB); | |
257 | pr_reg(LOCK); | |
258 | pr_reg(LD_TLB); | |
259 | pr_reg(CAM); | |
260 | pr_reg(RAM); | |
261 | pr_reg(GFLUSH); | |
262 | pr_reg(FLUSH_ENTRY); | |
263 | pr_reg(READ_CAM); | |
264 | pr_reg(READ_RAM); | |
265 | pr_reg(EMU_FAULT_AD); | |
14e0e679 | 266 | out: |
2bcb5733 HD |
267 | return p - buf; |
268 | } | |
269 | ||
270 | static void omap2_iommu_save_ctx(struct iommu *obj) | |
271 | { | |
272 | int i; | |
273 | u32 *p = obj->ctx; | |
274 | ||
275 | for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { | |
276 | p[i] = iommu_read_reg(obj, i * sizeof(u32)); | |
277 | dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]); | |
278 | } | |
279 | ||
280 | BUG_ON(p[0] != IOMMU_ARCH_VERSION); | |
281 | } | |
282 | ||
283 | static void omap2_iommu_restore_ctx(struct iommu *obj) | |
284 | { | |
285 | int i; | |
286 | u32 *p = obj->ctx; | |
287 | ||
288 | for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { | |
289 | iommu_write_reg(obj, p[i], i * sizeof(u32)); | |
290 | dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]); | |
291 | } | |
292 | ||
293 | BUG_ON(p[0] != IOMMU_ARCH_VERSION); | |
294 | } | |
295 | ||
296 | static void omap2_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e) | |
297 | { | |
298 | e->da = cr->cam & MMU_CAM_VATAG_MASK; | |
299 | e->pa = cr->ram & MMU_RAM_PADDR_MASK; | |
300 | e->valid = cr->cam & MMU_CAM_V; | |
301 | e->pgsz = cr->cam & MMU_CAM_PGSZ_MASK; | |
302 | e->endian = cr->ram & MMU_RAM_ENDIAN_MASK; | |
303 | e->elsz = cr->ram & MMU_RAM_ELSZ_MASK; | |
304 | e->mixed = cr->ram & MMU_RAM_MIXED; | |
305 | } | |
306 | ||
307 | static const struct iommu_functions omap2_iommu_ops = { | |
308 | .version = IOMMU_ARCH_VERSION, | |
309 | ||
310 | .enable = omap2_iommu_enable, | |
311 | .disable = omap2_iommu_disable, | |
ddfa975a | 312 | .set_twl = omap2_iommu_set_twl, |
2bcb5733 HD |
313 | .fault_isr = omap2_iommu_fault_isr, |
314 | ||
315 | .tlb_read_cr = omap2_tlb_read_cr, | |
316 | .tlb_load_cr = omap2_tlb_load_cr, | |
317 | ||
318 | .cr_to_e = omap2_cr_to_e, | |
319 | .cr_to_virt = omap2_cr_to_virt, | |
320 | .alloc_cr = omap2_alloc_cr, | |
321 | .cr_valid = omap2_cr_valid, | |
322 | .dump_cr = omap2_dump_cr, | |
323 | ||
324 | .get_pte_attr = omap2_get_pte_attr, | |
325 | ||
326 | .save_ctx = omap2_iommu_save_ctx, | |
327 | .restore_ctx = omap2_iommu_restore_ctx, | |
328 | .dump_ctx = omap2_iommu_dump_ctx, | |
329 | }; | |
330 | ||
331 | static int __init omap2_iommu_init(void) | |
332 | { | |
333 | return install_iommu_arch(&omap2_iommu_ops); | |
334 | } | |
335 | module_init(omap2_iommu_init); | |
336 | ||
337 | static void __exit omap2_iommu_exit(void) | |
338 | { | |
339 | uninstall_iommu_arch(&omap2_iommu_ops); | |
340 | } | |
341 | module_exit(omap2_iommu_exit); | |
342 | ||
343 | MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi"); | |
344 | MODULE_DESCRIPTION("omap iommu: omap2/3 architecture specific functions"); | |
345 | MODULE_LICENSE("GPL v2"); |