Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[pandora-kernel.git] / drivers / net / wireless / iwlwifi / iwl-io.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
4  *
5  * Portions of this file are derived from the ipw3945 project.
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of version 2 of the GNU General Public License as
9  * published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19  *
20  * The full GNU General Public License is included in this distribution in the
21  * file called LICENSE.
22  *
23  * Contact Information:
24  *  Intel Linux Wireless <ilw@linux.intel.com>
25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26  *
27  *****************************************************************************/
28
29 #include "iwl-io.h"
30
31 #define IWL_POLL_INTERVAL 10    /* microseconds */
32
33 static inline void __iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
34 {
35         iwl_write32(priv, reg, iwl_read32(priv, reg) | mask);
36 }
37
38 static inline void __iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
39 {
40         iwl_write32(priv, reg, iwl_read32(priv, reg) & ~mask);
41 }
42
43 void iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
44 {
45         unsigned long flags;
46
47         spin_lock_irqsave(&priv->reg_lock, flags);
48         __iwl_set_bit(priv, reg, mask);
49         spin_unlock_irqrestore(&priv->reg_lock, flags);
50 }
51
52 void iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
53 {
54         unsigned long flags;
55
56         spin_lock_irqsave(&priv->reg_lock, flags);
57         __iwl_clear_bit(priv, reg, mask);
58         spin_unlock_irqrestore(&priv->reg_lock, flags);
59 }
60
61 int iwl_poll_bit(struct iwl_priv *priv, u32 addr,
62                  u32 bits, u32 mask, int timeout)
63 {
64         int t = 0;
65
66         do {
67                 if ((iwl_read32(priv, addr) & mask) == (bits & mask))
68                         return t;
69                 udelay(IWL_POLL_INTERVAL);
70                 t += IWL_POLL_INTERVAL;
71         } while (t < timeout);
72
73         return -ETIMEDOUT;
74 }
75
76 int iwl_grab_nic_access_silent(struct iwl_priv *priv)
77 {
78         int ret;
79
80         lockdep_assert_held(&priv->reg_lock);
81
82         /* this bit wakes up the NIC */
83         __iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
84
85         /*
86          * These bits say the device is running, and should keep running for
87          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
88          * but they do not indicate that embedded SRAM is restored yet;
89          * 3945 and 4965 have volatile SRAM, and must save/restore contents
90          * to/from host DRAM when sleeping/waking for power-saving.
91          * Each direction takes approximately 1/4 millisecond; with this
92          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
93          * series of register accesses are expected (e.g. reading Event Log),
94          * to keep device from sleeping.
95          *
96          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
97          * SRAM is okay/restored.  We don't check that here because this call
98          * is just for hardware register access; but GP1 MAC_SLEEP check is a
99          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
100          *
101          * 5000 series and later (including 1000 series) have non-volatile SRAM,
102          * and do not save/restore SRAM when power cycling.
103          */
104         ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
105                            CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
106                            (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
107                             CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
108         if (ret < 0) {
109                 iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
110                 return -EIO;
111         }
112
113         return 0;
114 }
115
116 int iwl_grab_nic_access(struct iwl_priv *priv)
117 {
118         int ret = iwl_grab_nic_access_silent(priv);
119         if (ret) {
120                 u32 val = iwl_read32(priv, CSR_GP_CNTRL);
121                 IWL_ERR(priv,
122                         "MAC is in deep sleep!. CSR_GP_CNTRL = 0x%08X\n", val);
123         }
124
125         return ret;
126 }
127
128 void iwl_release_nic_access(struct iwl_priv *priv)
129 {
130         lockdep_assert_held(&priv->reg_lock);
131         __iwl_clear_bit(priv, CSR_GP_CNTRL,
132                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
133 }
134
135 u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
136 {
137         u32 value;
138         unsigned long flags;
139
140         spin_lock_irqsave(&priv->reg_lock, flags);
141         iwl_grab_nic_access(priv);
142         value = iwl_read32(priv, reg);
143         iwl_release_nic_access(priv);
144         spin_unlock_irqrestore(&priv->reg_lock, flags);
145
146         return value;
147 }
148
149 void iwl_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
150 {
151         unsigned long flags;
152
153         spin_lock_irqsave(&priv->reg_lock, flags);
154         if (!iwl_grab_nic_access(priv)) {
155                 iwl_write32(priv, reg, value);
156                 iwl_release_nic_access(priv);
157         }
158         spin_unlock_irqrestore(&priv->reg_lock, flags);
159 }
160
161 int iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr, u32 mask,
162                         int timeout)
163 {
164         int t = 0;
165
166         do {
167                 if ((iwl_read_direct32(priv, addr) & mask) == mask)
168                         return t;
169                 udelay(IWL_POLL_INTERVAL);
170                 t += IWL_POLL_INTERVAL;
171         } while (t < timeout);
172
173         return -ETIMEDOUT;
174 }
175
176 static inline u32 __iwl_read_prph(struct iwl_priv *priv, u32 reg)
177 {
178         iwl_write32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
179         rmb();
180         return iwl_read32(priv, HBUS_TARG_PRPH_RDAT);
181 }
182
183 static inline void __iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
184 {
185         iwl_write32(priv, HBUS_TARG_PRPH_WADDR,
186                     ((addr & 0x0000FFFF) | (3 << 24)));
187         wmb();
188         iwl_write32(priv, HBUS_TARG_PRPH_WDAT, val);
189 }
190
191 u32 iwl_read_prph(struct iwl_priv *priv, u32 reg)
192 {
193         unsigned long flags;
194         u32 val;
195
196         spin_lock_irqsave(&priv->reg_lock, flags);
197         iwl_grab_nic_access(priv);
198         val = __iwl_read_prph(priv, reg);
199         iwl_release_nic_access(priv);
200         spin_unlock_irqrestore(&priv->reg_lock, flags);
201         return val;
202 }
203
204 void iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
205 {
206         unsigned long flags;
207
208         spin_lock_irqsave(&priv->reg_lock, flags);
209         if (!iwl_grab_nic_access(priv)) {
210                 __iwl_write_prph(priv, addr, val);
211                 iwl_release_nic_access(priv);
212         }
213         spin_unlock_irqrestore(&priv->reg_lock, flags);
214 }
215
216 void iwl_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
217 {
218         unsigned long flags;
219
220         spin_lock_irqsave(&priv->reg_lock, flags);
221         iwl_grab_nic_access(priv);
222         __iwl_write_prph(priv, reg, __iwl_read_prph(priv, reg) | mask);
223         iwl_release_nic_access(priv);
224         spin_unlock_irqrestore(&priv->reg_lock, flags);
225 }
226
227 void iwl_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
228                             u32 bits, u32 mask)
229 {
230         unsigned long flags;
231
232         spin_lock_irqsave(&priv->reg_lock, flags);
233         iwl_grab_nic_access(priv);
234         __iwl_write_prph(priv, reg,
235                          (__iwl_read_prph(priv, reg) & mask) | bits);
236         iwl_release_nic_access(priv);
237         spin_unlock_irqrestore(&priv->reg_lock, flags);
238 }
239
240 void iwl_clear_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
241 {
242         unsigned long flags;
243         u32 val;
244
245         spin_lock_irqsave(&priv->reg_lock, flags);
246         iwl_grab_nic_access(priv);
247         val = __iwl_read_prph(priv, reg);
248         __iwl_write_prph(priv, reg, (val & ~mask));
249         iwl_release_nic_access(priv);
250         spin_unlock_irqrestore(&priv->reg_lock, flags);
251 }
252
253 void _iwl_read_targ_mem_words(struct iwl_priv *priv, u32 addr,
254                               void *buf, int words)
255 {
256         unsigned long flags;
257         int offs;
258         u32 *vals = buf;
259
260         spin_lock_irqsave(&priv->reg_lock, flags);
261         iwl_grab_nic_access(priv);
262
263         iwl_write32(priv, HBUS_TARG_MEM_RADDR, addr);
264         rmb();
265
266         for (offs = 0; offs < words; offs++)
267                 vals[offs] = iwl_read32(priv, HBUS_TARG_MEM_RDAT);
268
269         iwl_release_nic_access(priv);
270         spin_unlock_irqrestore(&priv->reg_lock, flags);
271 }
272
273 u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
274 {
275         u32 value;
276
277         _iwl_read_targ_mem_words(priv, addr, &value, 1);
278
279         return value;
280 }
281
282 void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
283 {
284         unsigned long flags;
285
286         spin_lock_irqsave(&priv->reg_lock, flags);
287         if (!iwl_grab_nic_access(priv)) {
288                 iwl_write32(priv, HBUS_TARG_MEM_WADDR, addr);
289                 wmb();
290                 iwl_write32(priv, HBUS_TARG_MEM_WDAT, val);
291                 iwl_release_nic_access(priv);
292         }
293         spin_unlock_irqrestore(&priv->reg_lock, flags);
294 }