1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
new file mode 100644
index 000000000000..5f30537f1927
--- /dev/null
+++ b/drivers/usb/musb/jz4740.c
@@ -0,0 +1,201 @@
+/*
+ * Ingenic JZ4740 "glue layer"
+ *
+ * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "musb_core.h"
+
+struct jz4740_glue {
+        struct device           *dev;
+        struct platform_device  *musb;
+        struct clk              *clk;
+};
+
+static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
+{
+        unsigned long   flags;
+        irqreturn_t     retval = IRQ_NONE;
+        struct musb     *musb = __hci;
+
+        spin_lock_irqsave(&musb->lock, flags);
+
+        musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+        musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+        musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+        /*
+         * The controller is gadget only, the state of the host mode IRQ bits is
+         * undefined. Mask them to make sure that the musb driver core will
+         * never see them set
+         */
+        musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
+            MUSB_INTR_RESET | MUSB_INTR_SOF;
+
+        if (musb->int_usb || musb->int_tx || musb->int_rx)
+                retval = musb_interrupt(musb);
+
+        spin_unlock_irqrestore(&musb->lock, flags);
+
+        return retval;
+}
+
+static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
+{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
+{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
+{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
+};
+
+static struct musb_hdrc_config jz4740_musb_config = {
+        /* Silicon does not implement USB OTG. */
+        .multipoint = 0,
+        /* Max EPs scanned, driver will decide which EP can be used. */
+        .num_eps    = 4,
+        /* RAMbits needed to configure EPs from table */
+        .ram_bits   = 9,
+        .fifo_cfg = jz4740_musb_fifo_cfg,
+        .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
+};
+
+static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
+        .mode   = MUSB_PERIPHERAL,
+        .config = &jz4740_musb_config,
+};
+
+static int jz4740_musb_init(struct musb *musb)
+{
+        musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+        if (!musb->xceiv) {
+                pr_err("HS UDC: no transceiver configured\n");
+                return -ENODEV;
+        }
+
+        /* Silicon does not implement ConfigData register.
+         * Set dyn_fifo to avoid reading EP config from hardware.
+         */
+        musb->dyn_fifo = true;
+
+        musb->isr = jz4740_musb_interrupt;
+
+        return 0;
+}
+
+static int jz4740_musb_exit(struct musb *musb)
+{
+        usb_put_phy(musb->xceiv);
+
+        return 0;
+}
+
+static const struct musb_platform_ops jz4740_musb_ops = {
+        .init           = jz4740_musb_init,
+        .exit           = jz4740_musb_exit,
+};
+
+static int jz4740_probe(struct platform_device *pdev)
+{
+        struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
+        struct platform_device          *musb;
+        struct jz4740_glue              *glue;
+        struct clk                      *clk;
+        int                             ret;
+
+        glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
+        if (!glue)
+                return -ENOMEM;
+
+        musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
+        if (!musb) {
+                dev_err(&pdev->dev, "failed to allocate musb device\n");
+                return -ENOMEM;
+        }
+
+        clk = devm_clk_get(&pdev->dev, "udc");
+        if (IS_ERR(clk)) {
+                dev_err(&pdev->dev, "failed to get clock\n");
+                ret = PTR_ERR(clk);
+                goto err_platform_device_put;
+        }
+
+        ret = clk_prepare_enable(clk);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to enable clock\n");
+                goto err_platform_device_put;
+        }
+
+        musb->dev.parent                = &pdev->dev;
+
+        glue->dev                       = &pdev->dev;
+        glue->musb                      = musb;
+        glue->clk                       = clk;
+
+        pdata->platform_ops             = &jz4740_musb_ops;
+
+        platform_set_drvdata(pdev, glue);
+
+        ret = platform_device_add_resources(musb, pdev->resource,
+                                            pdev->num_resources);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to add resources\n");
+                goto err_clk_disable;
+        }
+
+        ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
+        if (ret) {
+                dev_err(&pdev->dev, "failed to add platform_data\n");
+                goto err_clk_disable;
+        }
+
+        ret = platform_device_add(musb);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register musb device\n");
+                goto err_clk_disable;
+        }
+
+        return 0;
+
+err_clk_disable:
+        clk_disable_unprepare(clk);
+err_platform_device_put:
+        platform_device_put(musb);
+        return ret;
+}
+
+static int jz4740_remove(struct platform_device *pdev)
+{
+        struct jz4740_glue      *glue = platform_get_drvdata(pdev);
+
+        platform_device_unregister(glue->musb);
+        clk_disable_unprepare(glue->clk);
+
+        return 0;
+}
+
+static struct platform_driver jz4740_driver = {
+        .probe          = jz4740_probe,
+        .remove         = jz4740_remove,
+        .driver         = {
+                .name   = "musb-jz4740",
+        },
+};
+
+MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
+MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
+MODULE_LICENSE("GPL v2");
+module_platform_driver(jz4740_driver);