arch/mips/lantiq/xway/xrx200_phy_fw.c

   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
  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
  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");