1 /*
2  * Atheros CARL9170 driver
3  *
4  * Basic HW register/memory/command access functions
5  *
6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; see the file COPYING.  If not, see
20  * http://www.gnu.org/licenses/.
21  *
22  * This file incorporates work covered by the following copyright and
23  * permission notice:
24  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
25  *
26  *    Permission to use, copy, modify, and/or distribute this software for any
27  *    purpose with or without fee is hereby granted, provided that the above
28  *    copyright notice and this permission notice appear in all copies.
29  *
30  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
31  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
32  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
33  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
34  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
35  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
36  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
37  */
38 
39 #include <asm/div64.h>
40 #include "carl9170.h"
41 #include "cmd.h"
42 
43 int carl9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
44 {
45 	const __le32 buf[2] = {
46 		cpu_to_le32(reg),
47 		cpu_to_le32(val),
48 	};
49 	int err;
50 
51 	err = carl9170_exec_cmd(ar, CARL9170_CMD_WREG, sizeof(buf),
52 				(u8 *) buf, 0, NULL);
53 	if (err) {
54 		if (net_ratelimit()) {
55 			wiphy_err(ar->hw->wiphy, "writing reg %#x "
56 				"(val %#x) failed (%d)\n", reg, val, err);
57 		}
58 	}
59 	return err;
60 }
61 
62 int carl9170_read_mreg(struct ar9170 *ar, const int nregs,
63 		       const u32 *regs, u32 *out)
64 {
65 	int i, err;
66 	__le32 *offs, *res;
67 
68 	/* abuse "out" for the register offsets, must be same length */
69 	offs = (__le32 *)out;
70 	for (i = 0; i < nregs; i++)
71 		offs[i] = cpu_to_le32(regs[i]);
72 
73 	/* also use the same buffer for the input */
74 	res = (__le32 *)out;
75 
76 	err = carl9170_exec_cmd(ar, CARL9170_CMD_RREG,
77 				4 * nregs, (u8 *)offs,
78 				4 * nregs, (u8 *)res);
79 	if (err) {
80 		if (net_ratelimit()) {
81 			wiphy_err(ar->hw->wiphy, "reading regs failed (%d)\n",
82 				  err);
83 		}
84 		return err;
85 	}
86 
87 	/* convert result to cpu endian */
88 	for (i = 0; i < nregs; i++)
89 		out[i] = le32_to_cpu(res[i]);
90 
91 	return 0;
92 }
93 
94 int carl9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val)
95 {
96 	return carl9170_read_mreg(ar, 1, &reg, val);
97 }
98 
99 int carl9170_echo_test(struct ar9170 *ar, const u32 v)
100 {
101 	u32 echores;
102 	int err;
103 
104 	err = carl9170_exec_cmd(ar, CARL9170_CMD_ECHO,
105 				4, (u8 *)&v,
106 				4, (u8 *)&echores);
107 	if (err)
108 		return err;
109 
110 	if (v != echores) {
111 		wiphy_info(ar->hw->wiphy, "wrong echo %x != %x", v, echores);
112 		return -EINVAL;
113 	}
114 
115 	return 0;
116 }
117 
118 struct carl9170_cmd *carl9170_cmd_buf(struct ar9170 *ar,
119 	const enum carl9170_cmd_oids cmd, const unsigned int len)
120 {
121 	struct carl9170_cmd *tmp;
122 
123 	tmp = kzalloc(sizeof(struct carl9170_cmd_head) + len, GFP_ATOMIC);
124 	if (tmp) {
125 		tmp->hdr.cmd = cmd;
126 		tmp->hdr.len = len;
127 	}
128 
129 	return tmp;
130 }
131 
132 int carl9170_reboot(struct ar9170 *ar)
133 {
134 	struct carl9170_cmd *cmd;
135 	int err;
136 
137 	cmd = carl9170_cmd_buf(ar, CARL9170_CMD_REBOOT_ASYNC, 0);
138 	if (!cmd)
139 		return -ENOMEM;
140 
141 	err = __carl9170_exec_cmd(ar, cmd, true);
142 	return err;
143 }
144 
145 int carl9170_mac_reset(struct ar9170 *ar)
146 {
147 	return carl9170_exec_cmd(ar, CARL9170_CMD_SWRST,
148 				 0, NULL, 0, NULL);
149 }
150 
151 int carl9170_bcn_ctrl(struct ar9170 *ar, const unsigned int vif_id,
152 		       const u32 mode, const u32 addr, const u32 len)
153 {
154 	struct carl9170_cmd *cmd;
155 
156 	cmd = carl9170_cmd_buf(ar, CARL9170_CMD_BCN_CTRL_ASYNC,
157 			       sizeof(struct carl9170_bcn_ctrl_cmd));
158 	if (!cmd)
159 		return -ENOMEM;
160 
161 	cmd->bcn_ctrl.vif_id = cpu_to_le32(vif_id);
162 	cmd->bcn_ctrl.mode = cpu_to_le32(mode);
163 	cmd->bcn_ctrl.bcn_addr = cpu_to_le32(addr);
164 	cmd->bcn_ctrl.bcn_len = cpu_to_le32(len);
165 
166 	return __carl9170_exec_cmd(ar, cmd, true);
167 }
168 
169 int carl9170_collect_tally(struct ar9170 *ar)
170 {
171 	struct carl9170_tally_rsp tally;
172 	struct survey_info *info;
173 	unsigned int tick;
174 	int err;
175 
176 	err = carl9170_exec_cmd(ar, CARL9170_CMD_TALLY, 0, NULL,
177 				sizeof(tally), (u8 *)&tally);
178 	if (err)
179 		return err;
180 
181 	tick = le32_to_cpu(tally.tick);
182 	if (tick) {
183 		ar->tally.active += le32_to_cpu(tally.active) / tick;
184 		ar->tally.cca += le32_to_cpu(tally.cca) / tick;
185 		ar->tally.tx_time += le32_to_cpu(tally.tx_time) / tick;
186 		ar->tally.rx_total += le32_to_cpu(tally.rx_total);
187 		ar->tally.rx_overrun += le32_to_cpu(tally.rx_overrun);
188 
189 		if (ar->channel) {
190 			info = &ar->survey[ar->channel->hw_value];
191 			info->channel_time = ar->tally.active;
192 			info->channel_time_busy = ar->tally.cca;
193 			info->channel_time_tx = ar->tally.tx_time;
194 			do_div(info->channel_time, 1000);
195 			do_div(info->channel_time_busy, 1000);
196 			do_div(info->channel_time_tx, 1000);
197 		}
198 	}
199 	return 0;
200 }
201 
202 int carl9170_powersave(struct ar9170 *ar, const bool ps)
203 {
204 	struct carl9170_cmd *cmd;
205 	u32 state;
206 
207 	cmd = carl9170_cmd_buf(ar, CARL9170_CMD_PSM_ASYNC,
208 			       sizeof(struct carl9170_psm));
209 	if (!cmd)
210 		return -ENOMEM;
211 
212 	if (ps) {
213 		/* Sleep until next TBTT */
214 		state = CARL9170_PSM_SLEEP | 1;
215 	} else {
216 		/* wake up immediately */
217 		state = 1;
218 	}
219 
220 	cmd->psm.state = cpu_to_le32(state);
221 	return __carl9170_exec_cmd(ar, cmd, true);
222 }
223