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rtl871x_eeprom.c
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1 /******************************************************************************
2  * rtl871x_eeprom.c
3  *
4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
5  * Linux device driver for RTL8192SU
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  * Modifications for inclusion into the Linux staging tree are
21  * Copyright(c) 2010 Larry Finger. All rights reserved.
22  *
23  * Contact information:
24  * WLAN FAE <[email protected]>
25  * Larry Finger <[email protected]>
26  *
27  ******************************************************************************/
28 
29 #define _RTL871X_EEPROM_C_
30 
31 #include "osdep_service.h"
32 #include "drv_types.h"
33 
34 static void up_clk(struct _adapter *padapter, u16 *x)
35 {
36  *x = *x | _EESK;
37  r8712_write8(padapter, EE_9346CR, (u8)*x);
39 }
40 
41 static void down_clk(struct _adapter *padapter, u16 *x)
42 {
43  *x = *x & ~_EESK;
44  r8712_write8(padapter, EE_9346CR, (u8)*x);
46 }
47 
48 static void shift_out_bits(struct _adapter *padapter, u16 data, u16 count)
49 {
50  u16 x, mask;
51 
52  if (padapter->bSurpriseRemoved == true)
53  goto out;
54  mask = 0x01 << (count - 1);
55  x = r8712_read8(padapter, EE_9346CR);
56  x &= ~(_EEDO | _EEDI);
57  do {
58  x &= ~_EEDI;
59  if (data & mask)
60  x |= _EEDI;
61  if (padapter->bSurpriseRemoved == true)
62  goto out;
63  r8712_write8(padapter, EE_9346CR, (u8)x);
65  up_clk(padapter, &x);
66  down_clk(padapter, &x);
67  mask = mask >> 1;
68  } while (mask);
69  if (padapter->bSurpriseRemoved == true)
70  goto out;
71  x &= ~_EEDI;
72  r8712_write8(padapter, EE_9346CR, (u8)x);
73 out:;
74 }
75 
76 static u16 shift_in_bits(struct _adapter *padapter)
77 {
78  u16 x, d = 0, i;
79 
80  if (padapter->bSurpriseRemoved == true)
81  goto out;
82  x = r8712_read8(padapter, EE_9346CR);
83  x &= ~(_EEDO | _EEDI);
84  d = 0;
85  for (i = 0; i < 16; i++) {
86  d = d << 1;
87  up_clk(padapter, &x);
88  if (padapter->bSurpriseRemoved == true)
89  goto out;
90  x = r8712_read8(padapter, EE_9346CR);
91  x &= ~(_EEDI);
92  if (x & _EEDO)
93  d |= 1;
94  down_clk(padapter, &x);
95  }
96 out:
97  return d;
98 }
99 
100 static void standby(struct _adapter *padapter)
101 {
102  u8 x;
103 
104  x = r8712_read8(padapter, EE_9346CR);
105  x &= ~(_EECS | _EESK);
106  r8712_write8(padapter, EE_9346CR, x);
108  x |= _EECS;
109  r8712_write8(padapter, EE_9346CR, x);
111 }
112 
113 static u16 wait_eeprom_cmd_done(struct _adapter *padapter)
114 {
115  u8 x;
116  u16 i;
117 
118  standby(padapter);
119  for (i = 0; i < 200; i++) {
120  x = r8712_read8(padapter, EE_9346CR);
121  if (x & _EEDO)
122  return true;
124  }
125  return false;
126 }
127 
128 static void eeprom_clean(struct _adapter *padapter)
129 {
130  u16 x;
131 
132  if (padapter->bSurpriseRemoved == true)
133  return;
134  x = r8712_read8(padapter, EE_9346CR);
135  if (padapter->bSurpriseRemoved == true)
136  return;
137  x &= ~(_EECS | _EEDI);
138  r8712_write8(padapter, EE_9346CR, (u8)x);
139  if (padapter->bSurpriseRemoved == true)
140  return;
141  up_clk(padapter, &x);
142  if (padapter->bSurpriseRemoved == true)
143  return;
144  down_clk(padapter, &x);
145 }
146 
147 void r8712_eeprom_write16(struct _adapter *padapter, u16 reg, u16 data)
148 {
149  u8 x;
150  u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
151 
152  tmp8_ori = r8712_read8(padapter, 0x102502f1);
153  tmp8_new = tmp8_ori & 0xf7;
154  if (tmp8_ori != tmp8_new)
155  r8712_write8(padapter, 0x102502f1, tmp8_new);
156  tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
157  tmp8_clk_new = tmp8_clk_ori | 0x20;
158  if (tmp8_clk_new != tmp8_clk_ori)
159  r8712_write8(padapter, 0x10250003, tmp8_clk_new);
160  x = r8712_read8(padapter, EE_9346CR);
161  x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
162  x |= _EEM1 | _EECS;
163  r8712_write8(padapter, EE_9346CR, x);
164  shift_out_bits(padapter, EEPROM_EWEN_OPCODE, 5);
165  if (padapter->EepromAddressSize == 8) /*CF+ and SDIO*/
166  shift_out_bits(padapter, 0, 6);
167  else /* USB */
168  shift_out_bits(padapter, 0, 4);
169  standby(padapter);
170  /* Erase this particular word. Write the erase opcode and register
171  * number in that order. The opcode is 3bits in length; reg is 6
172  * bits long.
173  */
174  standby(padapter);
175  /* write the new word to the EEPROM
176  * send the write opcode the EEPORM
177  */
178  shift_out_bits(padapter, EEPROM_WRITE_OPCODE, 3);
179  /* select which word in the EEPROM that we are writing to. */
180  shift_out_bits(padapter, reg, padapter->EepromAddressSize);
181  /* write the data to the selected EEPROM word. */
182  shift_out_bits(padapter, data, 16);
183  if (wait_eeprom_cmd_done(padapter)) {
184  standby(padapter);
185  shift_out_bits(padapter, EEPROM_EWDS_OPCODE, 5);
186  shift_out_bits(padapter, reg, 4);
187  eeprom_clean(padapter);
188  }
189  if (tmp8_clk_new != tmp8_clk_ori)
190  r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
191  if (tmp8_new != tmp8_ori)
192  r8712_write8(padapter, 0x102502f1, tmp8_ori);
193 }
194 
195 u16 r8712_eeprom_read16(struct _adapter *padapter, u16 reg) /*ReadEEprom*/
196 {
197  u16 x;
198  u16 data = 0;
199  u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
200 
201  tmp8_ori = r8712_read8(padapter, 0x102502f1);
202  tmp8_new = tmp8_ori & 0xf7;
203  if (tmp8_ori != tmp8_new)
204  r8712_write8(padapter, 0x102502f1, tmp8_new);
205  tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
206  tmp8_clk_new = tmp8_clk_ori | 0x20;
207  if (tmp8_clk_new != tmp8_clk_ori)
208  r8712_write8(padapter, 0x10250003, tmp8_clk_new);
209  if (padapter->bSurpriseRemoved == true)
210  goto out;
211  /* select EEPROM, reset bits, set _EECS */
212  x = r8712_read8(padapter, EE_9346CR);
213  if (padapter->bSurpriseRemoved == true)
214  goto out;
215  x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
216  x |= _EEM1 | _EECS;
217  r8712_write8(padapter, EE_9346CR, (unsigned char)x);
218  /* write the read opcode and register number in that order
219  * The opcode is 3bits in length, reg is 6 bits long
220  */
221  shift_out_bits(padapter, EEPROM_READ_OPCODE, 3);
222  shift_out_bits(padapter, reg, padapter->EepromAddressSize);
223  /* Now read the data (16 bits) in from the selected EEPROM word */
224  data = shift_in_bits(padapter);
225  eeprom_clean(padapter);
226 out:
227  if (tmp8_clk_new != tmp8_clk_ori)
228  r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
229  if (tmp8_new != tmp8_ori)
230  r8712_write8(padapter, 0x102502f1, tmp8_ori);
231  return data;
232 }
233