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 <ar231x_platform.h> 23 #include "ath5k.h" 24 #include "debug.h" 25 #include "base.h" 26 #include "reg.h" 27 28 /* return bus cachesize in 4B word units */ 29 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz) 30 { 31 *csz = L1_CACHE_BYTES >> 2; 32 } 33 34 static bool 35 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data) 36 { 37 struct ath5k_hw *ah = common->priv; 38 struct platform_device *pdev = to_platform_device(ah->dev); 39 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 40 u16 *eeprom, *eeprom_end; 41 42 43 44 bcfg = pdev->dev.platform_data; 45 eeprom = (u16 *) bcfg->radio; 46 eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ; 47 48 eeprom += off; 49 if (eeprom > eeprom_end) 50 return false; 51 52 *data = *eeprom; 53 return true; 54 } 55 56 int ath5k_hw_read_srev(struct ath5k_hw *ah) 57 { 58 struct platform_device *pdev = to_platform_device(ah->dev); 59 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 60 ah->ah_mac_srev = bcfg->devid; 61 return 0; 62 } 63 64 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac) 65 { 66 struct platform_device *pdev = to_platform_device(ah->dev); 67 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 68 u8 *cfg_mac; 69 70 if (to_platform_device(ah->dev)->id == 0) 71 cfg_mac = bcfg->config->wlan0_mac; 72 else 73 cfg_mac = bcfg->config->wlan1_mac; 74 75 memcpy(mac, cfg_mac, ETH_ALEN); 76 return 0; 77 } 78 79 static const struct ath_bus_ops ath_ahb_bus_ops = { 80 .ath_bus_type = ATH_AHB, 81 .read_cachesize = ath5k_ahb_read_cachesize, 82 .eeprom_read = ath5k_ahb_eeprom_read, 83 .eeprom_read_mac = ath5k_ahb_eeprom_read_mac, 84 }; 85 86 /*Initialization*/ 87 static int ath_ahb_probe(struct platform_device *pdev) 88 { 89 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 90 struct ath5k_hw *ah; 91 struct ieee80211_hw *hw; 92 struct resource *res; 93 void __iomem *mem; 94 int irq; 95 int ret = 0; 96 u32 reg; 97 98 if (!pdev->dev.platform_data) { 99 dev_err(&pdev->dev, "no platform data specified\n"); 100 ret = -EINVAL; 101 goto err_out; 102 } 103 104 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 105 if (res == NULL) { 106 dev_err(&pdev->dev, "no memory resource found\n"); 107 ret = -ENXIO; 108 goto err_out; 109 } 110 111 mem = ioremap_nocache(res->start, resource_size(res)); 112 if (mem == NULL) { 113 dev_err(&pdev->dev, "ioremap failed\n"); 114 ret = -ENOMEM; 115 goto err_out; 116 } 117 118 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 119 if (res == NULL) { 120 dev_err(&pdev->dev, "no IRQ resource found\n"); 121 ret = -ENXIO; 122 goto err_out; 123 } 124 125 irq = res->start; 126 127 hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops); 128 if (hw == NULL) { 129 dev_err(&pdev->dev, "no memory for ieee80211_hw\n"); 130 ret = -ENOMEM; 131 goto err_out; 132 } 133 134 ah = hw->priv; 135 ah->hw = hw; 136 ah->dev = &pdev->dev; 137 ah->iobase = mem; 138 ah->irq = irq; 139 ah->devid = bcfg->devid; 140 141 if (bcfg->devid >= AR5K_SREV_AR2315_R6) { 142 /* Enable WMAC AHB arbitration */ 143 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 144 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN; 145 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 146 147 /* Enable global WMAC swapping */ 148 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP); 149 reg |= AR5K_AR2315_BYTESWAP_WMAC; 150 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP); 151 } else { 152 /* Enable WMAC DMA access (assuming 5312 or 231x*/ 153 /* TODO: check other platforms */ 154 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE); 155 if (to_platform_device(ah->dev)->id == 0) 156 reg |= AR5K_AR5312_ENABLE_WLAN0; 157 else 158 reg |= AR5K_AR5312_ENABLE_WLAN1; 159 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE); 160 161 /* 162 * On a dual-band AR5312, the multiband radio is only 163 * used as pass-through. Disable 2 GHz support in the 164 * driver for it 165 */ 166 if (to_platform_device(ah->dev)->id == 0 && 167 (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) == 168 (BD_WLAN1 | BD_WLAN0)) 169 ah->ah_capabilities.cap_needs_2GHz_ovr = true; 170 else 171 ah->ah_capabilities.cap_needs_2GHz_ovr = false; 172 } 173 174 ret = ath5k_init_ah(ah, &ath_ahb_bus_ops); 175 if (ret != 0) { 176 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret); 177 ret = -ENODEV; 178 goto err_free_hw; 179 } 180 181 platform_set_drvdata(pdev, hw); 182 183 return 0; 184 185 err_free_hw: 186 ieee80211_free_hw(hw); 187 platform_set_drvdata(pdev, NULL); 188 err_out: 189 return ret; 190 } 191 192 static int ath_ahb_remove(struct platform_device *pdev) 193 { 194 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 195 struct ieee80211_hw *hw = platform_get_drvdata(pdev); 196 struct ath5k_hw *ah; 197 u32 reg; 198 199 if (!hw) 200 return 0; 201 202 ah = hw->priv; 203 204 if (bcfg->devid >= AR5K_SREV_AR2315_R6) { 205 /* Disable WMAC AHB arbitration */ 206 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 207 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN; 208 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 209 } else { 210 /*Stop DMA access */ 211 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE); 212 if (to_platform_device(ah->dev)->id == 0) 213 reg &= ~AR5K_AR5312_ENABLE_WLAN0; 214 else 215 reg &= ~AR5K_AR5312_ENABLE_WLAN1; 216 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE); 217 } 218 219 ath5k_deinit_ah(ah); 220 platform_set_drvdata(pdev, NULL); 221 ieee80211_free_hw(hw); 222 223 return 0; 224 } 225 226 static struct platform_driver ath_ahb_driver = { 227 .probe = ath_ahb_probe, 228 .remove = ath_ahb_remove, 229 .driver = { 230 .name = "ar231x-wmac", 231 .owner = THIS_MODULE, 232 }, 233 }; 234 235 static int __init 236 ath5k_ahb_init(void) 237 { 238 return platform_driver_register(&ath_ahb_driver); 239 } 240 241 static void __exit 242 ath5k_ahb_exit(void) 243 { 244 platform_driver_unregister(&ath_ahb_driver); 245 } 246 247 module_init(ath5k_ahb_init); 248 module_exit(ath5k_ahb_exit); 249