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