This source file includes following definitions.
- ath9k_pci_fixup
- owl_fw_cb
- owl_get_eeprom_name
- owl_probe
- owl_remove
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14 #include <linux/module.h>
15 #include <linux/version.h>
16 #include <linux/completion.h>
17 #include <linux/etherdevice.h>
18 #include <linux/firmware.h>
19 #include <linux/pci.h>
20 #include <linux/delay.h>
21 #include <linux/platform_device.h>
22 #include <linux/ath9k_platform.h>
23
24 struct owl_ctx {
25 struct completion eeprom_load;
26 };
27
28 #define EEPROM_FILENAME_LEN 100
29
30 #define AR5416_EEPROM_MAGIC 0xa55a
31
32 static int ath9k_pci_fixup(struct pci_dev *pdev, const u16 *cal_data,
33 size_t cal_len)
34 {
35 void __iomem *mem;
36 const void *cal_end = (void *)cal_data + cal_len;
37 const struct {
38 u16 reg;
39 u16 low_val;
40 u16 high_val;
41 } __packed * data;
42 u16 cmd;
43 u32 bar0;
44 bool swap_needed = false;
45
46 if (*cal_data != AR5416_EEPROM_MAGIC) {
47 if (*cal_data != swab16(AR5416_EEPROM_MAGIC)) {
48 dev_err(&pdev->dev, "invalid calibration data\n");
49 return -EINVAL;
50 }
51
52 dev_dbg(&pdev->dev, "calibration data needs swapping\n");
53 swap_needed = true;
54 }
55
56 dev_info(&pdev->dev, "fixup device configuration\n");
57
58 mem = pcim_iomap(pdev, 0, 0);
59 if (!mem) {
60 dev_err(&pdev->dev, "ioremap error\n");
61 return -EINVAL;
62 }
63
64 pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &bar0);
65 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0,
66 pci_resource_start(pdev, 0));
67 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
68 cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
69 pci_write_config_word(pdev, PCI_COMMAND, cmd);
70
71
72 for (data = (const void *)(cal_data + 3);
73 (const void *)data <= cal_end && data->reg != (u16)~0;
74 data++) {
75 u32 val;
76 u16 reg;
77
78 reg = data->reg;
79 val = data->low_val;
80 val |= ((u32)data->high_val) << 16;
81
82 if (swap_needed) {
83 reg = swab16(reg);
84 val = swahb32(val);
85 }
86
87 iowrite32(val, mem + reg);
88 usleep_range(100, 120);
89 }
90
91 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
92 cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
93 pci_write_config_word(pdev, PCI_COMMAND, cmd);
94
95 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, bar0);
96 pcim_iounmap(pdev, mem);
97
98 pci_disable_device(pdev);
99
100 return 0;
101 }
102
103 static void owl_fw_cb(const struct firmware *fw, void *context)
104 {
105 struct pci_dev *pdev = (struct pci_dev *)context;
106 struct owl_ctx *ctx = (struct owl_ctx *)pci_get_drvdata(pdev);
107 struct pci_bus *bus;
108
109 complete(&ctx->eeprom_load);
110
111 if (!fw) {
112 dev_err(&pdev->dev, "no eeprom data received.\n");
113 goto release;
114 }
115
116
117 if (fw->size > 4096 || fw->size < 0x200 || (fw->size & 1) == 1) {
118 dev_err(&pdev->dev, "eeprom file has an invalid size.\n");
119 goto release;
120 }
121
122 if (ath9k_pci_fixup(pdev, (const u16 *)fw->data, fw->size))
123 goto release;
124
125 pci_lock_rescan_remove();
126 bus = pdev->bus;
127 pci_stop_and_remove_bus_device(pdev);
128
129
130
131 pci_rescan_bus(bus);
132 pci_unlock_rescan_remove();
133
134 release:
135 release_firmware(fw);
136 }
137
138 static const char *owl_get_eeprom_name(struct pci_dev *pdev)
139 {
140 struct device *dev = &pdev->dev;
141 char *eeprom_name;
142
143 dev_dbg(dev, "using auto-generated eeprom filename\n");
144
145 eeprom_name = devm_kzalloc(dev, EEPROM_FILENAME_LEN, GFP_KERNEL);
146 if (!eeprom_name)
147 return NULL;
148
149
150 scnprintf(eeprom_name, EEPROM_FILENAME_LEN, "ath9k-eeprom-pci-%s.bin",
151 dev_name(dev));
152
153 return eeprom_name;
154 }
155
156 static int owl_probe(struct pci_dev *pdev,
157 const struct pci_device_id *id)
158 {
159 struct owl_ctx *ctx;
160 const char *eeprom_name;
161 int err = 0;
162
163 if (pcim_enable_device(pdev))
164 return -EIO;
165
166 pcim_pin_device(pdev);
167
168 eeprom_name = owl_get_eeprom_name(pdev);
169 if (!eeprom_name) {
170 dev_err(&pdev->dev, "no eeprom filename found.\n");
171 return -ENODEV;
172 }
173
174 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
175 if (!ctx)
176 return -ENOMEM;
177
178 init_completion(&ctx->eeprom_load);
179
180 pci_set_drvdata(pdev, ctx);
181 err = request_firmware_nowait(THIS_MODULE, true, eeprom_name,
182 &pdev->dev, GFP_KERNEL, pdev, owl_fw_cb);
183 if (err)
184 dev_err(&pdev->dev, "failed to request caldata (%d).\n", err);
185
186 return err;
187 }
188
189 static void owl_remove(struct pci_dev *pdev)
190 {
191 struct owl_ctx *ctx = pci_get_drvdata(pdev);
192
193 if (ctx) {
194 wait_for_completion(&ctx->eeprom_load);
195 pci_set_drvdata(pdev, NULL);
196 }
197 }
198
199 static const struct pci_device_id owl_pci_table[] = {
200 { PCI_VDEVICE(ATHEROS, 0xff1c) },
201 { PCI_VDEVICE(ATHEROS, 0xff1d) },
202 { },
203 };
204 MODULE_DEVICE_TABLE(pci, owl_pci_table);
205
206 static struct pci_driver owl_driver = {
207 .name = KBUILD_MODNAME,
208 .id_table = owl_pci_table,
209 .probe = owl_probe,
210 .remove = owl_remove,
211 };
212 module_pci_driver(owl_driver);
213 MODULE_AUTHOR("Christian Lamparter <chunkeey@gmail.com>");
214 MODULE_DESCRIPTION("External EEPROM data loader for Atheros AR500X to AR92XX");
215 MODULE_LICENSE("Dual BSD/GPL");