1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
7 */
8
9 #include <linux/delay.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/module.h>
12 #include <linux/firmware.h>
13 #include <linux/of_platform.h>
14
15 #include <lantiq_soc.h>
16
17 #define XRX200_GPHY_FW_ALIGN (16 * 1024)
18
xway_gphy_load(struct platform_device * pdev)19 static dma_addr_t xway_gphy_load(struct platform_device *pdev)
20 {
21 const struct firmware *fw;
22 dma_addr_t dev_addr = 0;
23 const char *fw_name;
24 void *fw_addr;
25 size_t size;
26
27 if (of_property_read_string(pdev->dev.of_node, "firmware", &fw_name)) {
28 dev_err(&pdev->dev, "failed to load firmware filename\n");
29 return 0;
30 }
31
32 dev_info(&pdev->dev, "requesting %s\n", fw_name);
33 if (request_firmware(&fw, fw_name, &pdev->dev)) {
34 dev_err(&pdev->dev, "failed to load firmware: %s\n", fw_name);
35 return 0;
36 }
37
38 /*
39 * GPHY cores need the firmware code in a persistent and contiguous
40 * memory area with a 16 kB boundary aligned start address
41 */
42 size = fw->size + XRX200_GPHY_FW_ALIGN;
43
44 fw_addr = dma_alloc_coherent(&pdev->dev, size, &dev_addr, GFP_KERNEL);
45 if (fw_addr) {
46 fw_addr = PTR_ALIGN(fw_addr, XRX200_GPHY_FW_ALIGN);
47 dev_addr = ALIGN(dev_addr, XRX200_GPHY_FW_ALIGN);
48 memcpy(fw_addr, fw->data, fw->size);
49 } else {
50 dev_err(&pdev->dev, "failed to alloc firmware memory\n");
51 }
52
53 release_firmware(fw);
54 return dev_addr;
55 }
56
xway_phy_fw_probe(struct platform_device * pdev)57 static int xway_phy_fw_probe(struct platform_device *pdev)
58 {
59 dma_addr_t fw_addr;
60 struct property *pp;
61 unsigned char *phyids;
62 int i, ret = 0;
63
64 fw_addr = xway_gphy_load(pdev);
65 if (!fw_addr)
66 return -EINVAL;
67 pp = of_find_property(pdev->dev.of_node, "phys", NULL);
68 if (!pp)
69 return -ENOENT;
70 phyids = pp->value;
71 for (i = 0; i < pp->length && !ret; i++)
72 ret = xrx200_gphy_boot(&pdev->dev, phyids[i], fw_addr);
73 if (!ret)
74 mdelay(100);
75 return ret;
76 }
77
78 static const struct of_device_id xway_phy_match[] = {
79 { .compatible = "lantiq,phy-xrx200" },
80 {},
81 };
82 MODULE_DEVICE_TABLE(of, xway_phy_match);
83
84 static struct platform_driver xway_phy_driver = {
85 .probe = xway_phy_fw_probe,
86 .driver = {
87 .name = "phy-xrx200",
88 .owner = THIS_MODULE,
89 .of_match_table = xway_phy_match,
90 },
91 };
92
93 module_platform_driver(xway_phy_driver);
94
95 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
96 MODULE_DESCRIPTION("Lantiq XRX200 PHY Firmware Loader");
97 MODULE_LICENSE("GPL");
98