xref: /linux/drivers/net/wireless/ath/ath9k/ar9003_rtt.c (revision c4ee0af3fa0dc65f690fc908f02b8355f9576ea0)
1 /*
2  * Copyright (c) 2010-2011 Atheros Communications Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "hw.h"
18 #include "hw-ops.h"
19 #include "ar9003_phy.h"
20 #include "ar9003_rtt.h"
21 
22 #define RTT_RESTORE_TIMEOUT          1000
23 #define RTT_ACCESS_TIMEOUT           100
24 #define RTT_BAD_VALUE                0x0bad0bad
25 
26 /*
27  * RTT (Radio Retention Table) hardware implementation information
28  *
29  * There is an internal table (i.e. the rtt) for each chain (or bank).
30  * Each table contains 6 entries and each entry is corresponding to
31  * a specific calibration parameter as depicted below.
32  *  0~2 - DC offset DAC calibration: loop, low, high (offsetI/Q_...)
33  *  3   - Filter cal (filterfc)
34  *  4   - RX gain settings
35  *  5   - Peak detector offset calibration (agc_caldac)
36  */
37 
38 void ar9003_hw_rtt_enable(struct ath_hw *ah)
39 {
40 	REG_WRITE(ah, AR_PHY_RTT_CTRL, 1);
41 }
42 
43 void ar9003_hw_rtt_disable(struct ath_hw *ah)
44 {
45 	REG_WRITE(ah, AR_PHY_RTT_CTRL, 0);
46 }
47 
48 void ar9003_hw_rtt_set_mask(struct ath_hw *ah, u32 rtt_mask)
49 {
50 	REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL,
51 		      AR_PHY_RTT_CTRL_RESTORE_MASK, rtt_mask);
52 }
53 
54 bool ar9003_hw_rtt_force_restore(struct ath_hw *ah)
55 {
56 	if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL,
57 			   AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE,
58 			   0, RTT_RESTORE_TIMEOUT))
59 		return false;
60 
61 	REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL,
62 		      AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE, 1);
63 
64 	if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL,
65 			   AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE,
66 			   0, RTT_RESTORE_TIMEOUT))
67 		return false;
68 
69 	return true;
70 }
71 
72 static void ar9003_hw_rtt_load_hist_entry(struct ath_hw *ah, u8 chain,
73 					  u32 index, u32 data28)
74 {
75 	u32 val;
76 
77 	val = SM(data28, AR_PHY_RTT_SW_RTT_TABLE_DATA);
78 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain), val);
79 
80 	val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) |
81 	      SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE) |
82 	      SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR);
83 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
84 	udelay(1);
85 
86 	val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS);
87 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
88 	udelay(1);
89 
90 	if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
91 			   AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
92 			   RTT_ACCESS_TIMEOUT))
93 		return;
94 
95 	val &= ~SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE);
96 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
97 	udelay(1);
98 
99 	ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
100 		      AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
101 		      RTT_ACCESS_TIMEOUT);
102 }
103 
104 void ar9003_hw_rtt_load_hist(struct ath_hw *ah)
105 {
106 	int chain, i;
107 
108 	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
109 		if (!(ah->rxchainmask & (1 << chain)))
110 			continue;
111 		for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) {
112 			ar9003_hw_rtt_load_hist_entry(ah, chain, i,
113 					      ah->caldata->rtt_table[chain][i]);
114 			ath_dbg(ath9k_hw_common(ah), CALIBRATE,
115 				"Load RTT value at idx %d, chain %d: 0x%x\n",
116 				i, chain, ah->caldata->rtt_table[chain][i]);
117 		}
118 	}
119 }
120 
121 static void ar9003_hw_patch_rtt(struct ath_hw *ah, int index, int chain)
122 {
123 	int agc, caldac;
124 
125 	if (!test_bit(SW_PKDET_DONE, &ah->caldata->cal_flags))
126 		return;
127 
128 	if ((index != 5) || (chain >= 2))
129 		return;
130 
131 	agc = REG_READ_FIELD(ah, AR_PHY_65NM_RXRF_AGC(chain),
132 			     AR_PHY_65NM_RXRF_AGC_AGC_OVERRIDE);
133 	if (!agc)
134 		return;
135 
136 	caldac = ah->caldata->caldac[chain];
137 	ah->caldata->rtt_table[chain][index] &= 0xFFFF05FF;
138 	caldac = (caldac & 0x20) | ((caldac & 0x1F) << 7);
139 	ah->caldata->rtt_table[chain][index] |= (caldac << 4);
140 }
141 
142 static int ar9003_hw_rtt_fill_hist_entry(struct ath_hw *ah, u8 chain, u32 index)
143 {
144 	u32 val;
145 
146 	val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) |
147 	      SM(0, AR_PHY_RTT_SW_RTT_TABLE_WRITE) |
148 	      SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR);
149 
150 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
151 	udelay(1);
152 
153 	val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS);
154 	REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
155 	udelay(1);
156 
157 	if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
158 			   AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
159 			   RTT_ACCESS_TIMEOUT))
160 		return RTT_BAD_VALUE;
161 
162 	val = MS(REG_READ(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain)),
163 		 AR_PHY_RTT_SW_RTT_TABLE_DATA);
164 
165 
166 	return val;
167 }
168 
169 void ar9003_hw_rtt_fill_hist(struct ath_hw *ah)
170 {
171 	int chain, i;
172 
173 	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
174 		if (!(ah->rxchainmask & (1 << chain)))
175 			continue;
176 		for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) {
177 			ah->caldata->rtt_table[chain][i] =
178 				ar9003_hw_rtt_fill_hist_entry(ah, chain, i);
179 
180 			ar9003_hw_patch_rtt(ah, i, chain);
181 
182 			ath_dbg(ath9k_hw_common(ah), CALIBRATE,
183 				"RTT value at idx %d, chain %d is: 0x%x\n",
184 				i, chain, ah->caldata->rtt_table[chain][i]);
185 		}
186 	}
187 
188 	set_bit(RTT_DONE, &ah->caldata->cal_flags);
189 }
190 
191 void ar9003_hw_rtt_clear_hist(struct ath_hw *ah)
192 {
193 	int chain, i;
194 
195 	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
196 		if (!(ah->rxchainmask & (1 << chain)))
197 			continue;
198 		for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++)
199 			ar9003_hw_rtt_load_hist_entry(ah, chain, i, 0);
200 	}
201 
202 	if (ah->caldata)
203 		clear_bit(RTT_DONE, &ah->caldata->cal_flags);
204 }
205 
206 bool ar9003_hw_rtt_restore(struct ath_hw *ah, struct ath9k_channel *chan)
207 {
208 	bool restore;
209 
210 	if (!ah->caldata)
211 		return false;
212 
213 	if (test_bit(SW_PKDET_DONE, &ah->caldata->cal_flags)) {
214 		if (IS_CHAN_2GHZ(chan)){
215 			REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(0),
216 				      AR_PHY_65NM_RXRF_AGC_AGC2G_CALDAC_OVR,
217 				      ah->caldata->caldac[0]);
218 			REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(1),
219 				      AR_PHY_65NM_RXRF_AGC_AGC2G_CALDAC_OVR,
220 				      ah->caldata->caldac[1]);
221 		} else {
222 			REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(0),
223 				      AR_PHY_65NM_RXRF_AGC_AGC5G_CALDAC_OVR,
224 				      ah->caldata->caldac[0]);
225 			REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(1),
226 				      AR_PHY_65NM_RXRF_AGC_AGC5G_CALDAC_OVR,
227 				      ah->caldata->caldac[1]);
228 		}
229 		REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(1),
230 			      AR_PHY_65NM_RXRF_AGC_AGC_OVERRIDE, 0x1);
231 		REG_RMW_FIELD(ah, AR_PHY_65NM_RXRF_AGC(0),
232 			      AR_PHY_65NM_RXRF_AGC_AGC_OVERRIDE, 0x1);
233 	}
234 
235 	if (!test_bit(RTT_DONE, &ah->caldata->cal_flags))
236 		return false;
237 
238 	ar9003_hw_rtt_enable(ah);
239 
240 	if (test_bit(SW_PKDET_DONE, &ah->caldata->cal_flags))
241 		ar9003_hw_rtt_set_mask(ah, 0x30);
242 	else
243 		ar9003_hw_rtt_set_mask(ah, 0x10);
244 
245 	if (!ath9k_hw_rfbus_req(ah)) {
246 		ath_err(ath9k_hw_common(ah), "Could not stop baseband\n");
247 		restore = false;
248 		goto fail;
249 	}
250 
251 	ar9003_hw_rtt_load_hist(ah);
252 	restore = ar9003_hw_rtt_force_restore(ah);
253 
254 fail:
255 	ath9k_hw_rfbus_done(ah);
256 	ar9003_hw_rtt_disable(ah);
257 	return restore;
258 }
259