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