MIPS: lantiq: adds GPHY firmware loader

The internal GPHYs need a firmware blob to function properly. This patch adds
the code needed to request the blob and load it to the PHY.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4523

diff --git a/arch/mips/lantiq/Kconfig b/arch/mips/lantiq/Kconfig
index d84f361..c002191 100644 (file)
--- a/arch/mips/lantiq/Kconfig
+++ b/arch/mips/lantiq/Kconfig
@@ -36,4 +36,8 @@ config PCI_LANTIQ
        bool "PCI Support"
        depends on SOC_XWAY && PCI
 
+config XRX200_PHY_FW
+       bool "XRX200 PHY firmware loader"
+       depends on SOC_XWAY
+
 endif

diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile
index 70a58c7..7a13660 100644 (file)
--- a/arch/mips/lantiq/xway/Makefile
+++ b/arch/mips/lantiq/xway/Makefile
@@ -1 +1,3 @@
 obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
+
+obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o

diff --git a/arch/mips/lantiq/xway/xrx200_phy_fw.c b/arch/mips/lantiq/xway/xrx200_phy_fw.c
new file mode 100644 (file)
index 0000000..fe808bf
--- /dev/null
+++ b/arch/mips/lantiq/xway/xrx200_phy_fw.c
@@ -0,0 +1,97 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/of_platform.h>
+
+#include <lantiq_soc.h>
+
+#define XRX200_GPHY_FW_ALIGN   (16 * 1024)
+
+static dma_addr_t xway_gphy_load(struct platform_device *pdev)
+{
+       const struct firmware *fw;
+       dma_addr_t dev_addr = 0;
+       const char *fw_name;
+       void *fw_addr;
+       size_t size;
+
+       if (of_property_read_string(pdev->dev.of_node, "firmware", &fw_name)) {
+               dev_err(&pdev->dev, "failed to load firmware filename\n");
+               return 0;
+       }
+
+       dev_info(&pdev->dev, "requesting %s\n", fw_name);
+       if (request_firmware(&fw, fw_name, &pdev->dev)) {
+               dev_err(&pdev->dev, "failed to load firmware: %s\n", fw_name);
+               return 0;
+       }
+
+       /*
+        * GPHY cores need the firmware code in a persistent and contiguous
+        * memory area with a 16 kB boundary aligned start address
+        */
+       size = fw->size + XRX200_GPHY_FW_ALIGN;
+
+       fw_addr = dma_alloc_coherent(&pdev->dev, size, &dev_addr, GFP_KERNEL);
+       if (fw_addr) {
+               fw_addr = PTR_ALIGN(fw_addr, XRX200_GPHY_FW_ALIGN);
+               dev_addr = ALIGN(dev_addr, XRX200_GPHY_FW_ALIGN);
+               memcpy(fw_addr, fw->data, fw->size);
+       } else {
+               dev_err(&pdev->dev, "failed to alloc firmware memory\n");
+       }
+
+       release_firmware(fw);
+       return dev_addr;
+}
+
+static int __devinit xway_phy_fw_probe(struct platform_device *pdev)
+{
+       dma_addr_t fw_addr;
+       struct property *pp;
+       unsigned char *phyids;
+       int i, ret = 0;
+
+       fw_addr = xway_gphy_load(pdev);
+       if (!fw_addr)
+               return -EINVAL;
+       pp = of_find_property(pdev->dev.of_node, "phys", NULL);
+       if (!pp)
+               return -ENOENT;
+       phyids = pp->value;
+       for (i = 0; i < pp->length && !ret; i++)
+               ret = xrx200_gphy_boot(&pdev->dev, phyids[i], fw_addr);
+       if (!ret)
+               mdelay(100);
+       return ret;
+}
+
+static const struct of_device_id xway_phy_match[] = {
+       { .compatible = "lantiq,phy-xrx200" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, xway_phy_match);
+
+static struct platform_driver xway_phy_driver = {
+       .probe = xway_phy_fw_probe,
+       .driver = {
+               .name = "phy-xrx200",
+               .owner = THIS_MODULE,
+               .of_match_table = xway_phy_match,
+       },
+};
+
+module_platform_driver(xway_phy_driver);
+
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("Lantiq XRX200 PHY Firmware Loader");
+MODULE_LICENSE("GPL");