target/linux/bmips/files/arch/mips/bmips/ath9k-fixup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ATH9K Fixup Driver
   4  *
   5  * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
   6  * Copyright (C) 2014 Jonas Gorski <jonas.gorski@gmail.com>
   7  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   8  * Copyright (C) 2008 Florian Fainelli <f.fainelli@gmail.com>
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/pci.h>
  19 #include <linux/types.h>
  20 #include <linux/ath9k_platform.h>
  21
  22 #define ATH9K_MAX_FIXUPS        2
  23
  24 #define ATH9K_DEF_LED_PIN       -1
  25 #define ATH9K_DEF_PCI_DEV       255
  26
  27 struct ath9k_fixup {
  28         struct device *dev;
  29         struct resource *mem_res;
  30         u32 pci_dev;
  31         u8 mac[ETH_ALEN];
  32         struct ath9k_platform_data pdata;
  33 };
  34
  35 static int ath9k_num_fixups;
  36 static struct ath9k_fixup *ath9k_fixups[ATH9K_MAX_FIXUPS];
  37
  38 static void ath9k_pci_fixup(struct pci_dev *dev)
  39 {
  40         void __iomem *mem;
  41         struct ath9k_fixup *priv = NULL;
  42         struct ath9k_platform_data *pdata = NULL;
  43         struct pci_dev *bridge = pci_upstream_bridge(dev);
  44         u16 *cal_data = NULL;
  45         u16 cmd;
  46         u32 bar0;
  47         u32 val;
  48         unsigned i;
  49
  50         for (i = 0; i < ath9k_num_fixups; i++) {
  51                 if (ath9k_fixups[i]->pci_dev != PCI_SLOT(dev->devfn))
  52                         continue;
  53
  54                 priv = ath9k_fixups[i];
  55                 cal_data = priv->pdata.eeprom_data;
  56                 pdata = &priv->pdata;
  57                 break;
  58         }
  59
  60         if (cal_data == NULL)
  61                 return;
  62
  63         if (*cal_data != 0xa55a) {
  64                 pr_err("pci %s: invalid calibration data\n", pci_name(dev));
  65                 return;
  66         }
  67
  68         pr_info("pci %s: fixup device configuration\n", pci_name(dev));
  69
  70         val = priv->mem_res->start;
  71         mem = ioremap(priv->mem_res->start, resource_size(priv->mem_res));
  72         if (!mem) {
  73                 pr_err("pci %s: ioremap error\n", pci_name(dev));
  74                 return;
  75         }
  76
  77         if (bridge)
  78                 pci_enable_device(bridge);
  79
  80         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar0);
  81         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar0);
  82         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, val);
  83
  84         pci_read_config_word(dev, PCI_COMMAND, &cmd);
  85         cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
  86         pci_write_config_word(dev, PCI_COMMAND, cmd);
  87
  88         /* set offset to first reg address */
  89         cal_data += 3;
  90         while(*cal_data != 0xffff) {
  91                 u32 reg;
  92
  93                 reg = *cal_data++;
  94                 val = *cal_data++;
  95                 val |= (*cal_data++) << 16;
  96
  97                 writel(val, mem + reg);
  98                 udelay(100);
  99         }
 100
 101         pci_read_config_dword(dev, PCI_VENDOR_ID, &val);
 102         dev->vendor = val & 0xffff;
 103         dev->device = (val >> 16) & 0xffff;
 104
 105         pci_read_config_dword(dev, PCI_CLASS_REVISION, &val);
 106         dev->revision = val & 0xff;
 107         dev->class = val >> 8; /* upper 3 bytes */
 108
 109         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 110         cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
 111         pci_write_config_word(dev, PCI_COMMAND, cmd);
 112
 113         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, bar0);
 114
 115         if (bridge)
 116                 pci_disable_device(bridge);
 117
 118         iounmap(mem);
 119
 120         dev->dev.platform_data = pdata;
 121 }
 122 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATHEROS, PCI_ANY_ID, ath9k_pci_fixup);
 123
 124 static int ath9k_mtd_eeprom(struct ath9k_fixup *priv)
 125 {
 126         struct device *dev = priv->dev;
 127         struct device_node *node = dev->of_node;
 128         struct device_node *mtd_np = NULL;
 129         struct mtd_info *the_mtd;
 130         phandle phandle;
 131         size_t eeprom_readlen;
 132         const char *part;
 133         const __be32 *list;
 134         int ret, i;
 135
 136         list = of_get_property(node, "ath,eeprom", &i);
 137         if (!list || (i != (2 * sizeof(*list))))
 138                 return -ENODEV;
 139
 140         phandle = be32_to_cpup(list++);
 141         if (phandle)
 142                 mtd_np = of_find_node_by_phandle(phandle);
 143         if (!mtd_np)
 144                 return -ENODEV;
 145
 146         part = of_get_property(mtd_np, "label", NULL);
 147         if (!part)
 148                 part = mtd_np->name;
 149
 150         the_mtd = get_mtd_device_nm(part);
 151         if (IS_ERR(the_mtd))
 152                 return -ENODEV;
 153
 154         ret = mtd_read(the_mtd, be32_to_cpup(list),
 155                        ATH9K_PLAT_EEP_MAX_WORDS * sizeof(u16),
 156                        &eeprom_readlen, (void *) priv->pdata.eeprom_data);
 157         put_mtd_device(the_mtd);
 158         if (ret)
 159                 return ret;
 160
 161         return 0;
 162 }
 163
 164 static int ath9k_fixup_probe(struct platform_device *pdev)
 165 {
 166         struct device *dev = &pdev->dev;
 167         struct device_node *node = dev->of_node;
 168         struct ath9k_fixup *priv;
 169         struct resource *res;
 170         const void *mac;
 171         int ret;
 172
 173         if (ath9k_num_fixups >= ATH9K_MAX_FIXUPS)
 174                 return -ENOMEM;
 175
 176         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 177         if (!res)
 178                 return -EINVAL;
 179
 180         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 181         if (!priv)
 182                 return -ENOMEM;
 183
 184         priv->dev = dev;
 185         priv->mem_res = res;
 186
 187         ret = of_property_read_u32(node, "pci-dev", &priv->pci_dev);
 188         if (ret)
 189                 priv->pci_dev = ATH9K_DEF_PCI_DEV;
 190
 191         ret = ath9k_mtd_eeprom(priv);
 192         if (ret)
 193                 return ret;
 194
 195         priv->pdata.endian_check = of_property_read_bool(node,
 196                 "ath,endian-check");
 197         ret = of_property_read_s32(node, "ath,led-pin", &priv->pdata.led_pin);
 198         if (ret)
 199                 priv->pdata.led_pin = ATH9K_DEF_LED_PIN;
 200         priv->pdata.led_active_high = of_property_read_bool(node,
 201                 "ath,led-active-high");
 202
 203         mac = of_get_mac_address(node);
 204         if (!IS_ERR_OR_NULL(mac)) {
 205                 memcpy(priv->mac, mac, ETH_ALEN);
 206                 dev_info(dev, "mtd mac %pM\n", priv->mac);
 207         } else {
 208                 random_ether_addr(priv->mac);
 209                 dev_info(dev, "random mac %pM\n", priv->mac);
 210         }
 211
 212         priv->pdata.macaddr = priv->mac;
 213
 214         ath9k_fixups[ath9k_num_fixups] = priv;
 215         ath9k_num_fixups++;
 216
 217         return 0;
 218 }
 219
 220 static const struct of_device_id ath9k_fixup_of_match[] = {
 221         { .compatible = "brcm,ath9k-fixup" },
 222         { /* sentinel */ }
 223 };
 224
 225 static struct platform_driver ath9k_fixup_driver = {
 226         .probe = ath9k_fixup_probe,
 227         .driver = {
 228                 .name = "ath9k-fixup",
 229                 .of_match_table = ath9k_fixup_of_match,
 230         },
 231 };
 232
 233 int __init ath9k_fixup_init(void)
 234 {
 235         int ret = platform_driver_register(&ath9k_fixup_driver);
 236         if (ret)
 237                 pr_err("ath9k_fixup: Error registering platform driver!\n");
 238         return ret;
 239 }
 240 late_initcall(ath9k_fixup_init);