xref: /linux/drivers/net/wireless/ath/ath5k/ahb.c (revision 06d07429858317ded2db7986113a9e0129cd599b)
1 /*
2  * Copyright (c) 2008-2009 Atheros Communications Inc.
3  * Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
4  * Copyright (c) 2009 Imre Kaloz <kaloz@openwrt.org>
5  *
6  * Permission to use, copy, modify, and/or distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <linux/module.h>
20 #include <linux/nl80211.h>
21 #include <linux/platform_device.h>
22 #include <linux/etherdevice.h>
23 #include <ath25_platform.h>
24 #include "ath5k.h"
25 #include "debug.h"
26 #include "base.h"
27 #include "reg.h"
28 
29 /* return bus cachesize in 4B word units */
ath5k_ahb_read_cachesize(struct ath_common * common,int * csz)30 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
31 {
32 	*csz = L1_CACHE_BYTES >> 2;
33 }
34 
35 static bool
ath5k_ahb_eeprom_read(struct ath_common * common,u32 off,u16 * data)36 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
37 {
38 	struct ath5k_hw *ah = common->priv;
39 	struct platform_device *pdev = to_platform_device(ah->dev);
40 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
41 	u16 *eeprom, *eeprom_end;
42 
43 	eeprom = (u16 *) bcfg->radio;
44 	eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
45 
46 	eeprom += off;
47 	if (eeprom > eeprom_end)
48 		return false;
49 
50 	*data = *eeprom;
51 	return true;
52 }
53 
ath5k_hw_read_srev(struct ath5k_hw * ah)54 int ath5k_hw_read_srev(struct ath5k_hw *ah)
55 {
56 	struct platform_device *pdev = to_platform_device(ah->dev);
57 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
58 	ah->ah_mac_srev = bcfg->devid;
59 	return 0;
60 }
61 
ath5k_ahb_eeprom_read_mac(struct ath5k_hw * ah,u8 * mac)62 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
63 {
64 	struct platform_device *pdev = to_platform_device(ah->dev);
65 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
66 	u8 *cfg_mac;
67 
68 	if (to_platform_device(ah->dev)->id == 0)
69 		cfg_mac = bcfg->config->wlan0_mac;
70 	else
71 		cfg_mac = bcfg->config->wlan1_mac;
72 
73 	memcpy(mac, cfg_mac, ETH_ALEN);
74 	return 0;
75 }
76 
77 static const struct ath_bus_ops ath_ahb_bus_ops = {
78 	.ath_bus_type = ATH_AHB,
79 	.read_cachesize = ath5k_ahb_read_cachesize,
80 	.eeprom_read = ath5k_ahb_eeprom_read,
81 	.eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
82 };
83 
84 /*Initialization*/
ath_ahb_probe(struct platform_device * pdev)85 static int ath_ahb_probe(struct platform_device *pdev)
86 {
87 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
88 	struct ath5k_hw *ah;
89 	struct ieee80211_hw *hw;
90 	struct resource *res;
91 	void __iomem *mem;
92 	int irq;
93 	int ret = 0;
94 	u32 reg;
95 
96 	if (!dev_get_platdata(&pdev->dev)) {
97 		dev_err(&pdev->dev, "no platform data specified\n");
98 		ret = -EINVAL;
99 		goto err_out;
100 	}
101 
102 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103 	if (res == NULL) {
104 		dev_err(&pdev->dev, "no memory resource found\n");
105 		ret = -ENXIO;
106 		goto err_out;
107 	}
108 
109 	mem = ioremap(res->start, resource_size(res));
110 	if (mem == NULL) {
111 		dev_err(&pdev->dev, "ioremap failed\n");
112 		ret = -ENOMEM;
113 		goto err_out;
114 	}
115 
116 	irq = platform_get_irq(pdev, 0);
117 	if (irq < 0) {
118 		ret = irq;
119 		goto err_iounmap;
120 	}
121 
122 	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
123 	if (hw == NULL) {
124 		dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
125 		ret = -ENOMEM;
126 		goto err_iounmap;
127 	}
128 
129 	ah = hw->priv;
130 	ah->hw = hw;
131 	ah->dev = &pdev->dev;
132 	ah->iobase = mem;
133 	ah->irq = irq;
134 	ah->devid = bcfg->devid;
135 
136 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
137 		/* Enable WMAC AHB arbitration */
138 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
139 		reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
140 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
141 
142 		/* Enable global WMAC swapping */
143 		reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
144 		reg |= AR5K_AR2315_BYTESWAP_WMAC;
145 		iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
146 	} else {
147 		/* Enable WMAC DMA access (assuming 5312 or 231x*/
148 		/* TODO: check other platforms */
149 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
150 		if (to_platform_device(ah->dev)->id == 0)
151 			reg |= AR5K_AR5312_ENABLE_WLAN0;
152 		else
153 			reg |= AR5K_AR5312_ENABLE_WLAN1;
154 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
155 
156 		/*
157 		 * On a dual-band AR5312, the multiband radio is only
158 		 * used as pass-through. Disable 2 GHz support in the
159 		 * driver for it
160 		 */
161 		if (to_platform_device(ah->dev)->id == 0 &&
162 		    (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
163 		     (BD_WLAN1 | BD_WLAN0))
164 			ah->ah_capabilities.cap_needs_2GHz_ovr = true;
165 		else
166 			ah->ah_capabilities.cap_needs_2GHz_ovr = false;
167 	}
168 
169 	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
170 	if (ret != 0) {
171 		dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
172 		ret = -ENODEV;
173 		goto err_free_hw;
174 	}
175 
176 	platform_set_drvdata(pdev, hw);
177 
178 	return 0;
179 
180  err_free_hw:
181 	ieee80211_free_hw(hw);
182  err_iounmap:
183         iounmap(mem);
184  err_out:
185 	return ret;
186 }
187 
ath_ahb_remove(struct platform_device * pdev)188 static void ath_ahb_remove(struct platform_device *pdev)
189 {
190 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
191 	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
192 	struct ath5k_hw *ah;
193 	u32 reg;
194 
195 	if (!hw)
196 		return;
197 
198 	ah = hw->priv;
199 
200 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
201 		/* Disable WMAC AHB arbitration */
202 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
203 		reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
204 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
205 	} else {
206 		/*Stop DMA access */
207 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
208 		if (to_platform_device(ah->dev)->id == 0)
209 			reg &= ~AR5K_AR5312_ENABLE_WLAN0;
210 		else
211 			reg &= ~AR5K_AR5312_ENABLE_WLAN1;
212 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
213 	}
214 
215 	ath5k_deinit_ah(ah);
216 	iounmap(ah->iobase);
217 	ieee80211_free_hw(hw);
218 }
219 
220 static struct platform_driver ath_ahb_driver = {
221 	.probe      = ath_ahb_probe,
222 	.remove_new = ath_ahb_remove,
223 	.driver		= {
224 		.name	= "ar231x-wmac",
225 	},
226 };
227 
228 module_platform_driver(ath_ahb_driver);
229