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 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
117 	if (res == NULL) {
118 		dev_err(&pdev->dev, "no IRQ resource found\n");
119 		ret = -ENXIO;
120 		goto err_iounmap;
121 	}
122 
123 	irq = res->start;
124 
125 	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
126 	if (hw == NULL) {
127 		dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
128 		ret = -ENOMEM;
129 		goto err_iounmap;
130 	}
131 
132 	ah = hw->priv;
133 	ah->hw = hw;
134 	ah->dev = &pdev->dev;
135 	ah->iobase = mem;
136 	ah->irq = irq;
137 	ah->devid = bcfg->devid;
138 
139 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
140 		/* Enable WMAC AHB arbitration */
141 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
142 		reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
143 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
144 
145 		/* Enable global WMAC swapping */
146 		reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
147 		reg |= AR5K_AR2315_BYTESWAP_WMAC;
148 		iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
149 	} else {
150 		/* Enable WMAC DMA access (assuming 5312 or 231x*/
151 		/* TODO: check other platforms */
152 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
153 		if (to_platform_device(ah->dev)->id == 0)
154 			reg |= AR5K_AR5312_ENABLE_WLAN0;
155 		else
156 			reg |= AR5K_AR5312_ENABLE_WLAN1;
157 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
158 
159 		/*
160 		 * On a dual-band AR5312, the multiband radio is only
161 		 * used as pass-through. Disable 2 GHz support in the
162 		 * driver for it
163 		 */
164 		if (to_platform_device(ah->dev)->id == 0 &&
165 		    (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
166 		     (BD_WLAN1 | BD_WLAN0))
167 			ah->ah_capabilities.cap_needs_2GHz_ovr = true;
168 		else
169 			ah->ah_capabilities.cap_needs_2GHz_ovr = false;
170 	}
171 
172 	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
173 	if (ret != 0) {
174 		dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
175 		ret = -ENODEV;
176 		goto err_free_hw;
177 	}
178 
179 	platform_set_drvdata(pdev, hw);
180 
181 	return 0;
182 
183  err_free_hw:
184 	ieee80211_free_hw(hw);
185  err_iounmap:
186         iounmap(mem);
187  err_out:
188 	return ret;
189 }
190 
ath_ahb_remove(struct platform_device * pdev)191 static int ath_ahb_remove(struct platform_device *pdev)
192 {
193 	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
194 	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
195 	struct ath5k_hw *ah;
196 	u32 reg;
197 
198 	if (!hw)
199 		return 0;
200 
201 	ah = hw->priv;
202 
203 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
204 		/* Disable WMAC AHB arbitration */
205 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
206 		reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
207 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
208 	} else {
209 		/*Stop DMA access */
210 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
211 		if (to_platform_device(ah->dev)->id == 0)
212 			reg &= ~AR5K_AR5312_ENABLE_WLAN0;
213 		else
214 			reg &= ~AR5K_AR5312_ENABLE_WLAN1;
215 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
216 	}
217 
218 	ath5k_deinit_ah(ah);
219 	iounmap(ah->iobase);
220 	ieee80211_free_hw(hw);
221 
222 	return 0;
223 }
224 
225 static struct platform_driver ath_ahb_driver = {
226 	.probe      = ath_ahb_probe,
227 	.remove     = ath_ahb_remove,
228 	.driver		= {
229 		.name	= "ar231x-wmac",
230 	},
231 };
232 
233 module_platform_driver(ath_ahb_driver);
234