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James Bottomley2908d772006-08-29 09:22:51 -05001/*
2 * Aic94xx SAS/SATA driver register access.
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
9 * This file is part of the aic94xx driver.
10 *
11 * The aic94xx driver is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; version 2 of the
14 * License.
15 *
16 * The aic94xx driver is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with the aic94xx driver; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 *
25 */
26
27#include <linux/pci.h>
28#include "aic94xx_reg.h"
29#include "aic94xx.h"
30
31/* Writing to device address space.
32 * Offset comes before value to remind that the operation of
33 * this function is *offs = val.
34 */
Adrian Bunk81e56de2008-03-28 14:48:34 -070035static void asd_write_byte(struct asd_ha_struct *asd_ha,
36 unsigned long offs, u8 val)
James Bottomley2908d772006-08-29 09:22:51 -050037{
38 if (unlikely(asd_ha->iospace))
39 outb(val,
40 (unsigned long)asd_ha->io_handle[0].addr + (offs & 0xFF));
41 else
42 writeb(val, asd_ha->io_handle[0].addr + offs);
43 wmb();
44}
45
Adrian Bunk81e56de2008-03-28 14:48:34 -070046static void asd_write_word(struct asd_ha_struct *asd_ha,
47 unsigned long offs, u16 val)
James Bottomley2908d772006-08-29 09:22:51 -050048{
49 if (unlikely(asd_ha->iospace))
50 outw(val,
51 (unsigned long)asd_ha->io_handle[0].addr + (offs & 0xFF));
52 else
53 writew(val, asd_ha->io_handle[0].addr + offs);
54 wmb();
55}
56
Adrian Bunk81e56de2008-03-28 14:48:34 -070057static void asd_write_dword(struct asd_ha_struct *asd_ha,
58 unsigned long offs, u32 val)
James Bottomley2908d772006-08-29 09:22:51 -050059{
60 if (unlikely(asd_ha->iospace))
61 outl(val,
62 (unsigned long)asd_ha->io_handle[0].addr + (offs & 0xFF));
63 else
64 writel(val, asd_ha->io_handle[0].addr + offs);
65 wmb();
66}
67
68/* Reading from device address space.
69 */
Adrian Bunk81e56de2008-03-28 14:48:34 -070070static u8 asd_read_byte(struct asd_ha_struct *asd_ha, unsigned long offs)
James Bottomley2908d772006-08-29 09:22:51 -050071{
72 u8 val;
73 if (unlikely(asd_ha->iospace))
74 val = inb((unsigned long) asd_ha->io_handle[0].addr
75 + (offs & 0xFF));
76 else
77 val = readb(asd_ha->io_handle[0].addr + offs);
78 rmb();
79 return val;
80}
81
Adrian Bunk81e56de2008-03-28 14:48:34 -070082static u16 asd_read_word(struct asd_ha_struct *asd_ha,
83 unsigned long offs)
James Bottomley2908d772006-08-29 09:22:51 -050084{
85 u16 val;
86 if (unlikely(asd_ha->iospace))
87 val = inw((unsigned long)asd_ha->io_handle[0].addr
88 + (offs & 0xFF));
89 else
90 val = readw(asd_ha->io_handle[0].addr + offs);
91 rmb();
92 return val;
93}
94
Adrian Bunk81e56de2008-03-28 14:48:34 -070095static u32 asd_read_dword(struct asd_ha_struct *asd_ha,
96 unsigned long offs)
James Bottomley2908d772006-08-29 09:22:51 -050097{
98 u32 val;
99 if (unlikely(asd_ha->iospace))
100 val = inl((unsigned long) asd_ha->io_handle[0].addr
101 + (offs & 0xFF));
102 else
103 val = readl(asd_ha->io_handle[0].addr + offs);
104 rmb();
105 return val;
106}
107
108static inline u32 asd_mem_offs_swa(void)
109{
110 return 0;
111}
112
113static inline u32 asd_mem_offs_swc(void)
114{
115 return asd_mem_offs_swa() + MBAR0_SWA_SIZE;
116}
117
118static inline u32 asd_mem_offs_swb(void)
119{
120 return asd_mem_offs_swc() + MBAR0_SWC_SIZE + 0x20;
121}
122
123/* We know that the register wanted is in the range
124 * of the sliding window.
125 */
Adrian Bunk81e56de2008-03-28 14:48:34 -0700126#define ASD_READ_SW(ww, type, ord) \
127static type asd_read_##ww##_##ord(struct asd_ha_struct *asd_ha, \
128 u32 reg) \
129{ \
130 struct asd_ha_addrspace *io_handle = &asd_ha->io_handle[0]; \
131 u32 map_offs = (reg - io_handle->ww##_base) + asd_mem_offs_##ww();\
132 return asd_read_##ord(asd_ha, (unsigned long)map_offs); \
James Bottomley2908d772006-08-29 09:22:51 -0500133}
134
Adrian Bunk81e56de2008-03-28 14:48:34 -0700135#define ASD_WRITE_SW(ww, type, ord) \
136static void asd_write_##ww##_##ord(struct asd_ha_struct *asd_ha, \
137 u32 reg, type val) \
138{ \
139 struct asd_ha_addrspace *io_handle = &asd_ha->io_handle[0]; \
140 u32 map_offs = (reg - io_handle->ww##_base) + asd_mem_offs_##ww();\
141 asd_write_##ord(asd_ha, (unsigned long)map_offs, val); \
James Bottomley2908d772006-08-29 09:22:51 -0500142}
143
144ASD_READ_SW(swa, u8, byte);
145ASD_READ_SW(swa, u16, word);
146ASD_READ_SW(swa, u32, dword);
147
148ASD_READ_SW(swb, u8, byte);
149ASD_READ_SW(swb, u16, word);
150ASD_READ_SW(swb, u32, dword);
151
152ASD_READ_SW(swc, u8, byte);
153ASD_READ_SW(swc, u16, word);
154ASD_READ_SW(swc, u32, dword);
155
156ASD_WRITE_SW(swa, u8, byte);
157ASD_WRITE_SW(swa, u16, word);
158ASD_WRITE_SW(swa, u32, dword);
159
160ASD_WRITE_SW(swb, u8, byte);
161ASD_WRITE_SW(swb, u16, word);
162ASD_WRITE_SW(swb, u32, dword);
163
164ASD_WRITE_SW(swc, u8, byte);
165ASD_WRITE_SW(swc, u16, word);
166ASD_WRITE_SW(swc, u32, dword);
167
168/*
169 * A word about sliding windows:
170 * MBAR0 is divided into sliding windows A, C and B, in that order.
171 * SWA starts at offset 0 of MBAR0, up to 0x57, with size 0x58 bytes.
172 * SWC starts at offset 0x58 of MBAR0, up to 0x60, with size 0x8 bytes.
173 * From 0x60 to 0x7F, we have a copy of PCI config space 0x60-0x7F.
174 * SWB starts at offset 0x80 of MBAR0 and extends to the end of MBAR0.
175 * See asd_init_sw() in aic94xx_hwi.c
176 *
177 * We map the most common registers we'd access of the internal 4GB
178 * host adapter memory space. If a register/internal memory location
179 * is wanted which is not mapped, we slide SWB, by paging it,
180 * see asd_move_swb() in aic94xx_reg.c.
181 */
182
183/**
184 * asd_move_swb -- move sliding window B
185 * @asd_ha: pointer to host adapter structure
186 * @reg: register desired to be within range of the new window
187 */
Adrian Bunk81e56de2008-03-28 14:48:34 -0700188static void asd_move_swb(struct asd_ha_struct *asd_ha, u32 reg)
James Bottomley2908d772006-08-29 09:22:51 -0500189{
190 u32 base = reg & ~(MBAR0_SWB_SIZE-1);
191 pci_write_config_dword(asd_ha->pcidev, PCI_CONF_MBAR0_SWB, base);
192 asd_ha->io_handle[0].swb_base = base;
193}
194
195static void __asd_write_reg_byte(struct asd_ha_struct *asd_ha, u32 reg, u8 val)
196{
197 struct asd_ha_addrspace *io_handle=&asd_ha->io_handle[0];
198 BUG_ON(reg >= 0xC0000000 || reg < ALL_BASE_ADDR);
199 if (io_handle->swa_base <= reg
200 && reg < io_handle->swa_base + MBAR0_SWA_SIZE)
201 asd_write_swa_byte (asd_ha, reg,val);
202 else if (io_handle->swb_base <= reg
203 && reg < io_handle->swb_base + MBAR0_SWB_SIZE)
204 asd_write_swb_byte (asd_ha, reg, val);
205 else if (io_handle->swc_base <= reg
206 && reg < io_handle->swc_base + MBAR0_SWC_SIZE)
207 asd_write_swc_byte (asd_ha, reg, val);
208 else {
209 /* Ok, we have to move SWB */
210 asd_move_swb(asd_ha, reg);
211 asd_write_swb_byte (asd_ha, reg, val);
212 }
213}
214
215#define ASD_WRITE_REG(type, ord) \
216void asd_write_reg_##ord (struct asd_ha_struct *asd_ha, u32 reg, type val)\
217{ \
218 struct asd_ha_addrspace *io_handle=&asd_ha->io_handle[0]; \
219 unsigned long flags; \
220 BUG_ON(reg >= 0xC0000000 || reg < ALL_BASE_ADDR); \
221 spin_lock_irqsave(&asd_ha->iolock, flags); \
222 if (io_handle->swa_base <= reg \
223 && reg < io_handle->swa_base + MBAR0_SWA_SIZE) \
224 asd_write_swa_##ord (asd_ha, reg,val); \
225 else if (io_handle->swb_base <= reg \
226 && reg < io_handle->swb_base + MBAR0_SWB_SIZE) \
227 asd_write_swb_##ord (asd_ha, reg, val); \
228 else if (io_handle->swc_base <= reg \
229 && reg < io_handle->swc_base + MBAR0_SWC_SIZE) \
230 asd_write_swc_##ord (asd_ha, reg, val); \
231 else { \
232 /* Ok, we have to move SWB */ \
233 asd_move_swb(asd_ha, reg); \
234 asd_write_swb_##ord (asd_ha, reg, val); \
235 } \
236 spin_unlock_irqrestore(&asd_ha->iolock, flags); \
237}
238
239ASD_WRITE_REG(u8, byte);
240ASD_WRITE_REG(u16,word);
241ASD_WRITE_REG(u32,dword);
242
243static u8 __asd_read_reg_byte(struct asd_ha_struct *asd_ha, u32 reg)
244{
245 struct asd_ha_addrspace *io_handle=&asd_ha->io_handle[0];
246 u8 val;
247 BUG_ON(reg >= 0xC0000000 || reg < ALL_BASE_ADDR);
248 if (io_handle->swa_base <= reg
249 && reg < io_handle->swa_base + MBAR0_SWA_SIZE)
250 val = asd_read_swa_byte (asd_ha, reg);
251 else if (io_handle->swb_base <= reg
252 && reg < io_handle->swb_base + MBAR0_SWB_SIZE)
253 val = asd_read_swb_byte (asd_ha, reg);
254 else if (io_handle->swc_base <= reg
255 && reg < io_handle->swc_base + MBAR0_SWC_SIZE)
256 val = asd_read_swc_byte (asd_ha, reg);
257 else {
258 /* Ok, we have to move SWB */
259 asd_move_swb(asd_ha, reg);
260 val = asd_read_swb_byte (asd_ha, reg);
261 }
262 return val;
263}
264
265#define ASD_READ_REG(type, ord) \
266type asd_read_reg_##ord (struct asd_ha_struct *asd_ha, u32 reg) \
267{ \
268 struct asd_ha_addrspace *io_handle=&asd_ha->io_handle[0]; \
269 type val; \
270 unsigned long flags; \
271 BUG_ON(reg >= 0xC0000000 || reg < ALL_BASE_ADDR); \
272 spin_lock_irqsave(&asd_ha->iolock, flags); \
273 if (io_handle->swa_base <= reg \
274 && reg < io_handle->swa_base + MBAR0_SWA_SIZE) \
275 val = asd_read_swa_##ord (asd_ha, reg); \
276 else if (io_handle->swb_base <= reg \
277 && reg < io_handle->swb_base + MBAR0_SWB_SIZE) \
278 val = asd_read_swb_##ord (asd_ha, reg); \
279 else if (io_handle->swc_base <= reg \
280 && reg < io_handle->swc_base + MBAR0_SWC_SIZE) \
281 val = asd_read_swc_##ord (asd_ha, reg); \
282 else { \
283 /* Ok, we have to move SWB */ \
284 asd_move_swb(asd_ha, reg); \
285 val = asd_read_swb_##ord (asd_ha, reg); \
286 } \
287 spin_unlock_irqrestore(&asd_ha->iolock, flags); \
288 return val; \
289}
290
291ASD_READ_REG(u8, byte);
292ASD_READ_REG(u16,word);
293ASD_READ_REG(u32,dword);
294
295/**
296 * asd_read_reg_string -- read a string of bytes from io space memory
297 * @asd_ha: pointer to host adapter structure
298 * @dst: pointer to a destination buffer where data will be written to
299 * @offs: start offset (register) to read from
300 * @count: number of bytes to read
301 */
302void asd_read_reg_string(struct asd_ha_struct *asd_ha, void *dst,
303 u32 offs, int count)
304{
305 u8 *p = dst;
306 unsigned long flags;
307
308 spin_lock_irqsave(&asd_ha->iolock, flags);
309 for ( ; count > 0; count--, offs++, p++)
310 *p = __asd_read_reg_byte(asd_ha, offs);
311 spin_unlock_irqrestore(&asd_ha->iolock, flags);
312}
313
314/**
315 * asd_write_reg_string -- write a string of bytes to io space memory
316 * @asd_ha: pointer to host adapter structure
317 * @src: pointer to source buffer where data will be read from
318 * @offs: start offset (register) to write to
319 * @count: number of bytes to write
320 */
321void asd_write_reg_string(struct asd_ha_struct *asd_ha, void *src,
322 u32 offs, int count)
323{
324 u8 *p = src;
325 unsigned long flags;
326
327 spin_lock_irqsave(&asd_ha->iolock, flags);
328 for ( ; count > 0; count--, offs++, p++)
329 __asd_write_reg_byte(asd_ha, offs, *p);
330 spin_unlock_irqrestore(&asd_ha->iolock, flags);
331}