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/nl80211.h>
20#include <linux/platform_device.h>
21#include <linux/etherdevice.h>
22#include <linux/export.h>
23#include <ar231x_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 */
30static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
31{
32	*csz = L1_CACHE_BYTES >> 2;
33}
34
35static bool
36ath5k_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 = pdev->dev.platform_data;
41	u16 *eeprom, *eeprom_end;
42
43
44
45	bcfg = pdev->dev.platform_data;
46	eeprom = (u16 *) bcfg->radio;
47	eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
48
49	eeprom += off;
50	if (eeprom > eeprom_end)
51		return false;
52
53	*data = *eeprom;
54	return true;
55}
56
57int ath5k_hw_read_srev(struct ath5k_hw *ah)
58{
59	struct platform_device *pdev = to_platform_device(ah->dev);
60	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
61	ah->ah_mac_srev = bcfg->devid;
62	return 0;
63}
64
65static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
66{
67	struct platform_device *pdev = to_platform_device(ah->dev);
68	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
69	u8 *cfg_mac;
70
71	if (to_platform_device(ah->dev)->id == 0)
72		cfg_mac = bcfg->config->wlan0_mac;
73	else
74		cfg_mac = bcfg->config->wlan1_mac;
75
76	memcpy(mac, cfg_mac, ETH_ALEN);
77	return 0;
78}
79
80static const struct ath_bus_ops ath_ahb_bus_ops = {
81	.ath_bus_type = ATH_AHB,
82	.read_cachesize = ath5k_ahb_read_cachesize,
83	.eeprom_read = ath5k_ahb_eeprom_read,
84	.eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
85};
86
87/*Initialization*/
88static int ath_ahb_probe(struct platform_device *pdev)
89{
90	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
91	struct ath5k_hw *ah;
92	struct ieee80211_hw *hw;
93	struct resource *res;
94	void __iomem *mem;
95	int irq;
96	int ret = 0;
97	u32 reg;
98
99	if (!pdev->dev.platform_data) {
100		dev_err(&pdev->dev, "no platform data specified\n");
101		ret = -EINVAL;
102		goto err_out;
103	}
104
105	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106	if (res == NULL) {
107		dev_err(&pdev->dev, "no memory resource found\n");
108		ret = -ENXIO;
109		goto err_out;
110	}
111
112	mem = ioremap_nocache(res->start, resource_size(res));
113	if (mem == NULL) {
114		dev_err(&pdev->dev, "ioremap failed\n");
115		ret = -ENOMEM;
116		goto err_out;
117	}
118
119	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
120	if (res == NULL) {
121		dev_err(&pdev->dev, "no IRQ resource found\n");
122		ret = -ENXIO;
123		goto err_iounmap;
124	}
125
126	irq = res->start;
127
128	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
129	if (hw == NULL) {
130		dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
131		ret = -ENOMEM;
132		goto err_iounmap;
133	}
134
135	ah = hw->priv;
136	ah->hw = hw;
137	ah->dev = &pdev->dev;
138	ah->iobase = mem;
139	ah->irq = irq;
140	ah->devid = bcfg->devid;
141
142	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
143		/* Enable WMAC AHB arbitration */
144		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
145		reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
146		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
147
148		/* Enable global WMAC swapping */
149		reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
150		reg |= AR5K_AR2315_BYTESWAP_WMAC;
151		iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
152	} else {
153		/* Enable WMAC DMA access (assuming 5312 or 231x*/
154		/* TODO: check other platforms */
155		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
156		if (to_platform_device(ah->dev)->id == 0)
157			reg |= AR5K_AR5312_ENABLE_WLAN0;
158		else
159			reg |= AR5K_AR5312_ENABLE_WLAN1;
160		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
161
162		/*
163		 * On a dual-band AR5312, the multiband radio is only
164		 * used as pass-through. Disable 2 GHz support in the
165		 * driver for it
166		 */
167		if (to_platform_device(ah->dev)->id == 0 &&
168		    (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
169		     (BD_WLAN1 | BD_WLAN0))
170			ah->ah_capabilities.cap_needs_2GHz_ovr = true;
171		else
172			ah->ah_capabilities.cap_needs_2GHz_ovr = false;
173	}
174
175	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
176	if (ret != 0) {
177		dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
178		ret = -ENODEV;
179		goto err_free_hw;
180	}
181
182	platform_set_drvdata(pdev, hw);
183
184	return 0;
185
186 err_free_hw:
187	ieee80211_free_hw(hw);
188	platform_set_drvdata(pdev, NULL);
189 err_iounmap:
190        iounmap(mem);
191 err_out:
192	return ret;
193}
194
195static int ath_ahb_remove(struct platform_device *pdev)
196{
197	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
198	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
199	struct ath5k_hw *ah;
200	u32 reg;
201
202	if (!hw)
203		return 0;
204
205	ah = hw->priv;
206
207	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
208		/* Disable WMAC AHB arbitration */
209		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
210		reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
211		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
212	} else {
213		/*Stop DMA access */
214		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
215		if (to_platform_device(ah->dev)->id == 0)
216			reg &= ~AR5K_AR5312_ENABLE_WLAN0;
217		else
218			reg &= ~AR5K_AR5312_ENABLE_WLAN1;
219		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
220	}
221
222	ath5k_deinit_ah(ah);
223	iounmap(ah->iobase);
224	platform_set_drvdata(pdev, NULL);
225	ieee80211_free_hw(hw);
226
227	return 0;
228}
229
230static struct platform_driver ath_ahb_driver = {
231	.probe      = ath_ahb_probe,
232	.remove     = ath_ahb_remove,
233	.driver		= {
234		.name	= "ar231x-wmac",
235		.owner	= THIS_MODULE,
236	},
237};
238
239static int __init
240ath5k_ahb_init(void)
241{
242	return platform_driver_register(&ath_ahb_driver);
243}
244
245static void __exit
246ath5k_ahb_exit(void)
247{
248	platform_driver_unregister(&ath_ahb_driver);
249}
250
251module_init(ath5k_ahb_init);
252module_exit(ath5k_ahb_exit);
253