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 */ 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 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 = 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 57 int 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 65 static 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 80 static 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*/ 88 static 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 err_iounmap: 189 iounmap(mem); 190 err_out: 191 return ret; 192 } 193 194 static int ath_ahb_remove(struct platform_device *pdev) 195 { 196 struct ar231x_board_config *bcfg = pdev->dev.platform_data; 197 struct ieee80211_hw *hw = platform_get_drvdata(pdev); 198 struct ath5k_hw *ah; 199 u32 reg; 200 201 if (!hw) 202 return 0; 203 204 ah = hw->priv; 205 206 if (bcfg->devid >= AR5K_SREV_AR2315_R6) { 207 /* Disable WMAC AHB arbitration */ 208 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 209 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN; 210 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL); 211 } else { 212 /*Stop DMA access */ 213 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE); 214 if (to_platform_device(ah->dev)->id == 0) 215 reg &= ~AR5K_AR5312_ENABLE_WLAN0; 216 else 217 reg &= ~AR5K_AR5312_ENABLE_WLAN1; 218 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE); 219 } 220 221 ath5k_deinit_ah(ah); 222 iounmap(ah->iobase); 223 ieee80211_free_hw(hw); 224 225 return 0; 226 } 227 228 static struct platform_driver ath_ahb_driver = { 229 .probe = ath_ahb_probe, 230 .remove = ath_ahb_remove, 231 .driver = { 232 .name = "ar231x-wmac", 233 .owner = THIS_MODULE, 234 }, 235 }; 236 237 module_platform_driver(ath_ahb_driver); 238