drivers/net/wireless/ralink/rt2x00/rt2x00pci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6  */
   7
   8 /*
   9         Module: rt2x00pci
  10         Abstract: rt2x00 generic pci device routines.
  11  */
  12
  13 #include <linux/dma-mapping.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/slab.h>
  18
  19 #include "rt2x00.h"
  20 #include "rt2x00pci.h"
  21
  22 /*
  23  * PCI driver handlers.
  24  */
  25 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
  26 {
  27         kfree(rt2x00dev->rf);
  28         rt2x00dev->rf = NULL;
  29
  30         kfree(rt2x00dev->eeprom);
  31         rt2x00dev->eeprom = NULL;
  32
  33         if (rt2x00dev->csr.base) {
  34                 iounmap(rt2x00dev->csr.base);
  35                 rt2x00dev->csr.base = NULL;
  36         }
  37 }
  38
  39 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
  40 {
  41         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
  42
  43         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
  44         if (!rt2x00dev->csr.base)
  45                 goto exit;
  46
  47         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
  48         if (!rt2x00dev->eeprom)
  49                 goto exit;
  50
  51         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
  52         if (!rt2x00dev->rf)
  53                 goto exit;
  54
  55         return 0;
  56
  57 exit:
  58         rt2x00_probe_err("Failed to allocate registers\n");
  59
  60         rt2x00pci_free_reg(rt2x00dev);
  61
  62         return -ENOMEM;
  63 }
  64
  65 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct rt2x00_ops *ops)
  66 {
  67         struct ieee80211_hw *hw;
  68         struct rt2x00_dev *rt2x00dev;
  69         int retval;
  70         u16 chip;
  71
  72         retval = pci_enable_device(pci_dev);
  73         if (retval) {
  74                 rt2x00_probe_err("Enable device failed\n");
  75                 return retval;
  76         }
  77
  78         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
  79         if (retval) {
  80                 rt2x00_probe_err("PCI request regions failed\n");
  81                 goto exit_disable_device;
  82         }
  83
  84         pci_set_master(pci_dev);
  85
  86         if (pci_set_mwi(pci_dev))
  87                 rt2x00_probe_err("MWI not available\n");
  88
  89         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
  90                 rt2x00_probe_err("PCI DMA not supported\n");
  91                 retval = -EIO;
  92                 goto exit_release_regions;
  93         }
  94
  95         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
  96         if (!hw) {
  97                 rt2x00_probe_err("Failed to allocate hardware\n");
  98                 retval = -ENOMEM;
  99                 goto exit_release_regions;
 100         }
 101
 102         pci_set_drvdata(pci_dev, hw);
 103
 104         rt2x00dev = hw->priv;
 105         rt2x00dev->dev = &pci_dev->dev;
 106         rt2x00dev->ops = ops;
 107         rt2x00dev->hw = hw;
 108         rt2x00dev->irq = pci_dev->irq;
 109         rt2x00dev->name = ops->name;
 110
 111         if (pci_is_pcie(pci_dev))
 112                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 113         else
 114                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 115
 116         retval = rt2x00pci_alloc_reg(rt2x00dev);
 117         if (retval)
 118                 goto exit_free_device;
 119
 120         /*
 121          * Because rt3290 chip use different efuse offset to read efuse data.
 122          * So before read efuse it need to indicate it is the
 123          * rt3290 or not.
 124          */
 125         pci_read_config_word(pci_dev, PCI_DEVICE_ID, &chip);
 126         rt2x00dev->chip.rt = chip;
 127
 128         retval = rt2x00lib_probe_dev(rt2x00dev);
 129         if (retval)
 130                 goto exit_free_reg;
 131
 132         return 0;
 133
 134 exit_free_reg:
 135         rt2x00pci_free_reg(rt2x00dev);
 136
 137 exit_free_device:
 138         ieee80211_free_hw(hw);
 139
 140 exit_release_regions:
 141         pci_clear_mwi(pci_dev);
 142         pci_release_regions(pci_dev);
 143
 144 exit_disable_device:
 145         pci_disable_device(pci_dev);
 146
 147         return retval;
 148 }
 149 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 150
 151 void rt2x00pci_remove(struct pci_dev *pci_dev)
 152 {
 153         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 154         struct rt2x00_dev *rt2x00dev = hw->priv;
 155
 156         /*
 157          * Free all allocated data.
 158          */
 159         rt2x00lib_remove_dev(rt2x00dev);
 160         rt2x00pci_free_reg(rt2x00dev);
 161         ieee80211_free_hw(hw);
 162
 163         /*
 164          * Free the PCI device data.
 165          */
 166         pci_clear_mwi(pci_dev);
 167         pci_disable_device(pci_dev);
 168         pci_release_regions(pci_dev);
 169 }
 170 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 171
 172 #ifdef CONFIG_PM
 173 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 174 {
 175         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 176         struct rt2x00_dev *rt2x00dev = hw->priv;
 177         int retval;
 178
 179         retval = rt2x00lib_suspend(rt2x00dev, state);
 180         if (retval)
 181                 return retval;
 182
 183         pci_save_state(pci_dev);
 184         pci_disable_device(pci_dev);
 185         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 186 }
 187 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 188
 189 int rt2x00pci_resume(struct pci_dev *pci_dev)
 190 {
 191         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 192         struct rt2x00_dev *rt2x00dev = hw->priv;
 193
 194         if (pci_set_power_state(pci_dev, PCI_D0) ||
 195             pci_enable_device(pci_dev)) {
 196                 rt2x00_err(rt2x00dev, "Failed to resume device\n");
 197                 return -EIO;
 198         }
 199
 200         pci_restore_state(pci_dev);
 201         return rt2x00lib_resume(rt2x00dev);
 202 }
 203 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 204 #endif /* CONFIG_PM */
 205
 206 /*
 207  * rt2x00pci module information.
 208  */
 209 MODULE_AUTHOR(DRV_PROJECT);
 210 MODULE_VERSION(DRV_VERSION);
 211 MODULE_DESCRIPTION("rt2x00 pci library");
 212 MODULE_LICENSE("GPL");