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

3 files changed, 103 insertions, 0 deletions

diff --git a/arch/mips/lantiq/Kconfig b/arch/mips/lantiq/Kconfig
index d84f361f1e45..c0021912131e 100644
--- 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 70a58c747bd0..7a13660d630d 100644
--- 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
index 000000000000..fe808bf5366d
--- /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");