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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / arch / powerpc / sysdev / bestcomm / bestcomm_priv.h
blob3b52f3ffbdf869f1381a732c9ddcc5c6205be0d1
1 /*
2 * Private header for the MPC52xx processor BestComm driver
3 *
4 * By private, we mean that driver should not use it directly. It's meant
5 * to be used by the BestComm engine driver itself and by the intermediate
6 * layer between the core and the drivers.
7 *
8 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
9 * Copyright (C) 2005 Varma Electronics Oy,
10 * ( by Andrey Volkov <avolkov@varma-el.com> )
11 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
12 * ( by Dale Farnsworth <dfarnsworth@mvista.com> )
13 *
14 * This file is licensed under the terms of the GNU General Public License
15 * version 2. This program is licensed "as is" without any warranty of any
16 * kind, whether express or implied.
17 */
18
19 #ifndef __BESTCOMM_PRIV_H__
20 #define __BESTCOMM_PRIV_H__
21
22 #include <linux/spinlock.h>
23 #include <linux/of.h>
24 #include <asm/io.h>
25 #include <asm/mpc52xx.h>
26
27 #include "sram.h"
28
29
30 /* ======================================================================== */
31 /* Engine related stuff */
32 /* ======================================================================== */
33
34 /* Zones sizes and needed alignments */
35 #define BCOM_MAX_TASKS 16
36 #define BCOM_MAX_VAR 24
37 #define BCOM_MAX_INC 8
38 #define BCOM_MAX_FDT 64
39 #define BCOM_MAX_CTX 20
40 #define BCOM_CTX_SIZE (BCOM_MAX_CTX * sizeof(u32))
41 #define BCOM_CTX_ALIGN 0x100
42 #define BCOM_VAR_SIZE (BCOM_MAX_VAR * sizeof(u32))
43 #define BCOM_INC_SIZE (BCOM_MAX_INC * sizeof(u32))
44 #define BCOM_VAR_ALIGN 0x80
45 #define BCOM_FDT_SIZE (BCOM_MAX_FDT * sizeof(u32))
46 #define BCOM_FDT_ALIGN 0x100
47
48 /**
49 * struct bcom_tdt - Task Descriptor Table Entry
50 *
51 */
52 struct bcom_tdt {
53 u32 start;
54 u32 stop;
55 u32 var;
56 u32 fdt;
57 u32 exec_status; /* used internally by BestComm engine */
58 u32 mvtp; /* used internally by BestComm engine */
59 u32 context;
60 u32 litbase;
61 };
62
63 /**
64 * struct bcom_engine
65 *
66 * This holds all info needed globaly to handle the engine
67 */
68 struct bcom_engine {
69 struct device_node *ofnode;
70 struct mpc52xx_sdma __iomem *regs;
71 phys_addr_t regs_base;
72
73 struct bcom_tdt *tdt;
74 u32 *ctx;
75 u32 *var;
76 u32 *fdt;
77
78 spinlock_t lock;
79 };
80
81 extern struct bcom_engine *bcom_eng;
82
83
84 /* ======================================================================== */
85 /* Tasks related stuff */
86 /* ======================================================================== */
87
88 /* Tasks image header */
89 #define BCOM_TASK_MAGIC 0x4243544B /* 'BCTK' */
90
91 struct bcom_task_header {
92 u32 magic;
93 u8 desc_size; /* the size fields */
94 u8 var_size; /* are given in number */
95 u8 inc_size; /* of 32-bits words */
96 u8 first_var;
97 u8 reserved[8];
98 };
99
100 /* Descriptors structure & co */
101 #define BCOM_DESC_NOP 0x000001f8
102 #define BCOM_LCD_MASK 0x80000000
103 #define BCOM_DRD_EXTENDED 0x40000000
104 #define BCOM_DRD_INITIATOR_SHIFT 21
105
106 /* Tasks pragma */
107 #define BCOM_PRAGMA_BIT_RSV 7 /* reserved pragma bit */
108 #define BCOM_PRAGMA_BIT_PRECISE_INC 6 /* increment 0=when possible, */
109 /* 1=iter end */
110 #define BCOM_PRAGMA_BIT_RST_ERROR_NO 5 /* don't reset errors on */
111 /* task enable */
112 #define BCOM_PRAGMA_BIT_PACK 4 /* pack data enable */
113 #define BCOM_PRAGMA_BIT_INTEGER 3 /* data alignment */
114 /* 0=frac(msb), 1=int(lsb) */
115 #define BCOM_PRAGMA_BIT_SPECREAD 2 /* XLB speculative read */
116 #define BCOM_PRAGMA_BIT_CW 1 /* write line buffer enable */
117 #define BCOM_PRAGMA_BIT_RL 0 /* read line buffer enable */
118
119 /* Looks like XLB speculative read generates XLB errors when a buffer
120 * is at the end of the physical memory. i.e. when accessing the
121 * lasts words, the engine tries to prefetch the next but there is no
122 * next ...
123 */
124 #define BCOM_STD_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
125 (0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
126 (0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
127 (0 << BCOM_PRAGMA_BIT_PACK) | \
128 (0 << BCOM_PRAGMA_BIT_INTEGER) | \
129 (0 << BCOM_PRAGMA_BIT_SPECREAD) | \
130 (1 << BCOM_PRAGMA_BIT_CW) | \
131 (1 << BCOM_PRAGMA_BIT_RL))
132
133 #define BCOM_PCI_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
134 (0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
135 (0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
136 (0 << BCOM_PRAGMA_BIT_PACK) | \
137 (1 << BCOM_PRAGMA_BIT_INTEGER) | \
138 (0 << BCOM_PRAGMA_BIT_SPECREAD) | \
139 (1 << BCOM_PRAGMA_BIT_CW) | \
140 (1 << BCOM_PRAGMA_BIT_RL))
141
142 #define BCOM_ATA_PRAGMA BCOM_STD_PRAGMA
143 #define BCOM_CRC16_DP_0_PRAGMA BCOM_STD_PRAGMA
144 #define BCOM_CRC16_DP_1_PRAGMA BCOM_STD_PRAGMA
145 #define BCOM_FEC_RX_BD_PRAGMA BCOM_STD_PRAGMA
146 #define BCOM_FEC_TX_BD_PRAGMA BCOM_STD_PRAGMA
147 #define BCOM_GEN_DP_0_PRAGMA BCOM_STD_PRAGMA
148 #define BCOM_GEN_DP_1_PRAGMA BCOM_STD_PRAGMA
149 #define BCOM_GEN_DP_2_PRAGMA BCOM_STD_PRAGMA
150 #define BCOM_GEN_DP_3_PRAGMA BCOM_STD_PRAGMA
151 #define BCOM_GEN_DP_BD_0_PRAGMA BCOM_STD_PRAGMA
152 #define BCOM_GEN_DP_BD_1_PRAGMA BCOM_STD_PRAGMA
153 #define BCOM_GEN_RX_BD_PRAGMA BCOM_STD_PRAGMA
154 #define BCOM_GEN_TX_BD_PRAGMA BCOM_STD_PRAGMA
155 #define BCOM_GEN_LPC_PRAGMA BCOM_STD_PRAGMA
156 #define BCOM_PCI_RX_PRAGMA BCOM_PCI_PRAGMA
157 #define BCOM_PCI_TX_PRAGMA BCOM_PCI_PRAGMA
158
159 /* Initiators number */
160 #define BCOM_INITIATOR_ALWAYS 0
161 #define BCOM_INITIATOR_SCTMR_0 1
162 #define BCOM_INITIATOR_SCTMR_1 2
163 #define BCOM_INITIATOR_FEC_RX 3
164 #define BCOM_INITIATOR_FEC_TX 4
165 #define BCOM_INITIATOR_ATA_RX 5
166 #define BCOM_INITIATOR_ATA_TX 6
167 #define BCOM_INITIATOR_SCPCI_RX 7
168 #define BCOM_INITIATOR_SCPCI_TX 8
169 #define BCOM_INITIATOR_PSC3_RX 9
170 #define BCOM_INITIATOR_PSC3_TX 10
171 #define BCOM_INITIATOR_PSC2_RX 11
172 #define BCOM_INITIATOR_PSC2_TX 12
173 #define BCOM_INITIATOR_PSC1_RX 13
174 #define BCOM_INITIATOR_PSC1_TX 14
175 #define BCOM_INITIATOR_SCTMR_2 15
176 #define BCOM_INITIATOR_SCLPC 16
177 #define BCOM_INITIATOR_PSC5_RX 17
178 #define BCOM_INITIATOR_PSC5_TX 18
179 #define BCOM_INITIATOR_PSC4_RX 19
180 #define BCOM_INITIATOR_PSC4_TX 20
181 #define BCOM_INITIATOR_I2C2_RX 21
182 #define BCOM_INITIATOR_I2C2_TX 22
183 #define BCOM_INITIATOR_I2C1_RX 23
184 #define BCOM_INITIATOR_I2C1_TX 24
185 #define BCOM_INITIATOR_PSC6_RX 25
186 #define BCOM_INITIATOR_PSC6_TX 26
187 #define BCOM_INITIATOR_IRDA_RX 25
188 #define BCOM_INITIATOR_IRDA_TX 26
189 #define BCOM_INITIATOR_SCTMR_3 27
190 #define BCOM_INITIATOR_SCTMR_4 28
191 #define BCOM_INITIATOR_SCTMR_5 29
192 #define BCOM_INITIATOR_SCTMR_6 30
193 #define BCOM_INITIATOR_SCTMR_7 31
194
195 /* Initiators priorities */
196 #define BCOM_IPR_ALWAYS 7
197 #define BCOM_IPR_SCTMR_0 2
198 #define BCOM_IPR_SCTMR_1 2
199 #define BCOM_IPR_FEC_RX 6
200 #define BCOM_IPR_FEC_TX 5
201 #define BCOM_IPR_ATA_RX 7
202 #define BCOM_IPR_ATA_TX 7
203 #define BCOM_IPR_SCPCI_RX 2
204 #define BCOM_IPR_SCPCI_TX 2
205 #define BCOM_IPR_PSC3_RX 2
206 #define BCOM_IPR_PSC3_TX 2
207 #define BCOM_IPR_PSC2_RX 2
208 #define BCOM_IPR_PSC2_TX 2
209 #define BCOM_IPR_PSC1_RX 2
210 #define BCOM_IPR_PSC1_TX 2
211 #define BCOM_IPR_SCTMR_2 2
212 #define BCOM_IPR_SCLPC 2
213 #define BCOM_IPR_PSC5_RX 2
214 #define BCOM_IPR_PSC5_TX 2
215 #define BCOM_IPR_PSC4_RX 2
216 #define BCOM_IPR_PSC4_TX 2
217 #define BCOM_IPR_I2C2_RX 2
218 #define BCOM_IPR_I2C2_TX 2
219 #define BCOM_IPR_I2C1_RX 2
220 #define BCOM_IPR_I2C1_TX 2
221 #define BCOM_IPR_PSC6_RX 2
222 #define BCOM_IPR_PSC6_TX 2
223 #define BCOM_IPR_IRDA_RX 2
224 #define BCOM_IPR_IRDA_TX 2
225 #define BCOM_IPR_SCTMR_3 2
226 #define BCOM_IPR_SCTMR_4 2
227 #define BCOM_IPR_SCTMR_5 2
228 #define BCOM_IPR_SCTMR_6 2
229 #define BCOM_IPR_SCTMR_7 2
230
231
232 /* ======================================================================== */
233 /* API */
234 /* ======================================================================== */
235
236 extern struct bcom_task *bcom_task_alloc(int bd_count, int bd_size, int priv_size);
237 extern void bcom_task_free(struct bcom_task *tsk);
238 extern int bcom_load_image(int task, u32 *task_image);
239 extern void bcom_set_initiator(int task, int initiator);
240
241
242 #define TASK_ENABLE 0x8000
243
244 /**
245 * bcom_disable_prefetch - Hook to disable bus prefetching
246 *
247 * ATA DMA and the original MPC5200 need this due to silicon bugs. At the
248 * moment disabling prefetch is a one-way street. There is no mechanism
249 * in place to turn prefetch back on after it has been disabled. There is
250 * no reason it couldn't be done, it would just be more complex to implement.
251 */
252 static inline void bcom_disable_prefetch(void)
253 {
254 u16 regval;
255
256 regval = in_be16(&bcom_eng->regs->PtdCntrl);
257 out_be16(&bcom_eng->regs->PtdCntrl, regval | 1);
258 };
259
260 static inline void
261 bcom_enable_task(int task)
262 {
263 u16 reg;
264 reg = in_be16(&bcom_eng->regs->tcr[task]);
265 out_be16(&bcom_eng->regs->tcr[task], reg | TASK_ENABLE);
266 }
267
268 static inline void
269 bcom_disable_task(int task)
270 {
271 u16 reg = in_be16(&bcom_eng->regs->tcr[task]);
272 out_be16(&bcom_eng->regs->tcr[task], reg & ~TASK_ENABLE);
273 }
274
275
276 static inline u32 *
277 bcom_task_desc(int task)
278 {
279 return bcom_sram_pa2va(bcom_eng->tdt[task].start);
280 }
281
282 static inline int
283 bcom_task_num_descs(int task)
284 {
285 return (bcom_eng->tdt[task].stop - bcom_eng->tdt[task].start)/sizeof(u32) + 1;
286 }
287
288 static inline u32 *
289 bcom_task_var(int task)
290 {
291 return bcom_sram_pa2va(bcom_eng->tdt[task].var);
292 }
293
294 static inline u32 *
295 bcom_task_inc(int task)
296 {
297 return &bcom_task_var(task)[BCOM_MAX_VAR];
298 }
299
300
301 static inline int
302 bcom_drd_is_extended(u32 desc)
303 {
304 return (desc) & BCOM_DRD_EXTENDED;
305 }
306
307 static inline int
308 bcom_desc_is_drd(u32 desc)
309 {
310 return !(desc & BCOM_LCD_MASK) && desc != BCOM_DESC_NOP;
311 }
312
313 static inline int
314 bcom_desc_initiator(u32 desc)
315 {
316 return (desc >> BCOM_DRD_INITIATOR_SHIFT) & 0x1f;
317 }
318
319 static inline void
320 bcom_set_desc_initiator(u32 *desc, int initiator)
321 {
322 *desc = (*desc & ~(0x1f << BCOM_DRD_INITIATOR_SHIFT)) |
323 ((initiator & 0x1f) << BCOM_DRD_INITIATOR_SHIFT);
324 }
325
326
327 static inline void
328 bcom_set_task_pragma(int task, int pragma)
329 {
330 u32 *fdt = &bcom_eng->tdt[task].fdt;
331 *fdt = (*fdt & ~0xff) | pragma;
332 }
333
334 static inline void
335 bcom_set_task_auto_start(int task, int next_task)
336 {
337 u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
338 out_be16(tcr, (in_be16(tcr) & ~0xff) | 0x00c0 | next_task);
339 }
340
341 static inline void
342 bcom_set_tcr_initiator(int task, int initiator)
343 {
344 u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
345 out_be16(tcr, (in_be16(tcr) & ~0x1f00) | ((initiator & 0x1f) << 8));
346 }
347
348
349 #endif /* __BESTCOMM_PRIV_H__ */
350
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