--- /dev/null
+/*
+ * driver/usb/gadget/imx_udc.c
+ *
+ * Copyright (C) 2005 Mike Lee(eemike@gmail.com)
+ * Copyright (C) 2008 Darius Augulis <augulis.darius@gmail.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <mach/usb.h>
+#include <mach/hardware.h>
+
+#include "imx_udc.h"
+
+static const char driver_name[] = "imx_udc";
+static const char ep0name[] = "ep0";
+
+void ep0_chg_stat(const char *label, struct imx_udc_struct *imx_usb,
+ enum ep0_state stat);
+
+/*******************************************************************************
+ * IMX UDC hardware related functions
+ *******************************************************************************
+ */
+
+void imx_udc_enable(struct imx_udc_struct *imx_usb)
+{
+ int temp = __raw_readl(imx_usb->base + USB_CTRL);
+ __raw_writel(temp | CTRL_FE_ENA | CTRL_AFE_ENA, imx_usb->base + USB_CTRL);
+ imx_usb->gadget.speed = USB_SPEED_FULL;
+}
+
+void imx_udc_disable(struct imx_udc_struct *imx_usb)
+{
+ int temp = __raw_readl(imx_usb->base + USB_CTRL);
+
+ __raw_writel(temp & ~(CTRL_FE_ENA | CTRL_AFE_ENA),
+ imx_usb->base + USB_CTRL);
+
+ ep0_chg_stat(__func__, imx_usb, EP0_IDLE);
+ imx_usb->gadget.speed = USB_SPEED_UNKNOWN;
+}
+
+void imx_udc_reset(struct imx_udc_struct *imx_usb)
+{
+ int temp = __raw_readl(imx_usb->base + USB_ENAB);
+
+ /* set RST bit */
+ __raw_writel(temp | ENAB_RST, imx_usb->base + USB_ENAB);
+
+ /* wait RST bit to clear */
+ do {} while (__raw_readl(imx_usb->base + USB_ENAB) & ENAB_RST);
+
+ /* wait CFG bit to assert */
+ do {} while (!(__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG));
+
+ /* udc module is now ready */
+}
+
+void imx_udc_config(struct imx_udc_struct *imx_usb)
+{
+ u8 ep_conf[5];
+ u8 i, j, cfg;
+ struct imx_ep_struct *imx_ep;
+
+ /* wait CFG bit to assert */
+ do {} while (!(__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG));
+
+ /* Download the endpoint buffer for endpoint 0. */
+ for (j = 0; j < 5; j++) {
+ i = (j == 2 ? imx_usb->imx_ep[0].fifosize : 0x00);
+ __raw_writeb(i, imx_usb->base + USB_DDAT);
+ do {} while (__raw_readl(imx_usb->base + USB_DADR) & DADR_BSY);
+ }
+
+ /* Download the endpoint buffers for endpoints 1-5.
+ * We specify two configurations, one interface
+ */
+ for (cfg = 1; cfg < 3; cfg++) {
+ for (i = 1; i < IMX_USB_NB_EP; i++) {
+ imx_ep = &imx_usb->imx_ep[i];
+ /* EP no | Config no */
+ ep_conf[0] = (i << 4) | (cfg << 2);
+ /* Type | Direction */
+ ep_conf[1] = (imx_ep->bmAttributes << 3) |
+ (EP_DIR(imx_ep) << 2);
+ /* Max packet size */
+ ep_conf[2] = imx_ep->fifosize;
+ /* TRXTYP */
+ ep_conf[3] = 0xC0;
+ /* FIFO no */
+ ep_conf[4] = i;
+
+ D_INI(imx_usb->dev,
+ "<%s> ep%d_conf[%d]:"
+ "[%02x-%02x-%02x-%02x-%02x]\n",
+ __func__, i, cfg,
+ ep_conf[0], ep_conf[1], ep_conf[2],
+ ep_conf[3], ep_conf[4]);
+
+ for (j = 0; j < 5; j++) {
+ __raw_writeb(ep_conf[j],
+ imx_usb->base + USB_DDAT);
+ do {} while (__raw_readl(imx_usb->base + USB_DADR)
+ & DADR_BSY);
+ }
+ }
+ }
+
+ /* wait CFG bit to clear */
+ do {} while (__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG);
+}
+
+void imx_udc_init_irq(struct imx_udc_struct *imx_usb)
+{
+ int i;
+
+ /* Mask and clear all irqs */
+ __raw_writel(0xFFFFFFFF, imx_usb->base + USB_MASK);
+ __raw_writel(0xFFFFFFFF, imx_usb->base + USB_INTR);
+ for (i = 0; i < IMX_USB_NB_EP; i++) {
+ __raw_writel(0x1FF, imx_usb->base + USB_EP_MASK(i));
+ __raw_writel(0x1FF, imx_usb->base + USB_EP_INTR(i));
+ }
+
+ /* Enable USB irqs */
+ __raw_writel(INTR_MSOF | INTR_FRAME_MATCH, imx_usb->base + USB_MASK);
+
+ /* Enable EP0 irqs */
+ __raw_writel(0x1FF & ~(EPINTR_DEVREQ | EPINTR_MDEVREQ | EPINTR_EOT
+ | EPINTR_EOF | EPINTR_FIFO_EMPTY | EPINTR_FIFO_FULL),
+ imx_usb->base + USB_EP_MASK(0));
+}
+
+void imx_udc_init_ep(struct imx_udc_struct *imx_usb)
+{
+ int i, max, temp;
+ struct imx_ep_struct *imx_ep;
+ for (i = 0; i < IMX_USB_NB_EP; i++) {
+ imx_ep = &imx_usb->imx_ep[i];
+ switch (imx_ep->fifosize) {
+ case 8:
+ max = 0;
+ break;
+ case 16:
+ max = 1;
+ break;
+ case 32:
+ max = 2;
+ break;
+ case 64:
+ max = 3;
+ break;
+ default:
+ max = 1;
+ break;
+ }
+ temp = (EP_DIR(imx_ep) << 7) | (max << 5)
+ | (imx_ep->bmAttributes << 3);
+ __raw_writel(temp, imx_usb->base + USB_EP_STAT(i));
+ __raw_writel(temp | EPSTAT_FLUSH, imx_usb->base + USB_EP_STAT(i));
+ D_INI(imx_usb->dev, "<%s> ep%d_stat %08x\n", __func__, i,
+ __raw_readl(imx_usb->base + USB_EP_STAT(i)));
+ }
+}
+
+void imx_udc_init_fifo(struct imx_udc_struct *imx_usb)
+{
+ int i, temp;
+ struct imx_ep_struct *imx_ep;
+ for (i = 0; i < IMX_USB_NB_EP; i++) {
+ imx_ep = &imx_usb->imx_ep[i];
+
+ /* Fifo control */
+ temp = EP_DIR(imx_ep) ? 0x0B000000 : 0x0F000000;
+ __raw_writel(temp, imx_usb->base + USB_EP_FCTRL(i));
+ D_INI(imx_usb->dev, "<%s> ep%d_fctrl %08x\n", __func__, i,
+ __raw_readl(imx_usb->base + USB_EP_FCTRL(i)));
+
+ /* Fifo alarm */
+ temp = (i ? imx_ep->fifosize / 2 : 0);
+ __raw_writel(temp, imx_usb->base + USB_EP_FALRM(i));
+ D_INI(imx_usb->dev, "<%s> ep%d_falrm %08x\n", __func__, i,
+ __raw_readl(imx_usb->base + USB_EP_FALRM(i)));
+ }
+}
+
+static void imx_udc_init(struct imx_udc_struct *imx_usb)
+{
+ /* Reset UDC */
+ imx_udc_reset(imx_usb);
+
+ /* Download config to enpoint buffer */
+ imx_udc_config(imx_usb);
+
+ /* Setup interrups */
+ imx_udc_init_irq(imx_usb);
+
+ /* Setup endpoints */
+ imx_udc_init_ep(imx_usb);
+
+ /* Setup fifos */
+ imx_udc_init_fifo(imx_usb);
+}
+
+void imx_ep_irq_enable(struct imx_ep_struct *imx_ep)
+{
+
+ int i = EP_NO(imx_ep);
+
+ __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_MASK(i));
+ __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_INTR(i));
+ __raw_writel(0x1FF & ~(EPINTR_EOT | EPINTR_EOF),
+ imx_ep->imx_usb->base + USB_EP_MASK(i));
+}
+
+void imx_ep_irq_disable(struct imx_ep_struct *imx_ep)
+{
+
+ int i = EP_NO(imx_ep);
+
+ __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_MASK(i));
+ __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_INTR(i));
+}
+
+int imx_ep_empty(struct imx_ep_struct *imx_ep)
+{
+ struct imx_udc_struct *imx_usb = imx_ep->imx_usb;
+
+ return __raw_readl(imx_usb->base + USB_EP_FSTAT(EP_NO(imx_ep)))
+ & FSTAT_EMPTY;
+}
+
+unsigned imx_fifo_bcount(struct imx_ep_struct *imx_ep)
+{
+ struct imx_udc_struct *imx_usb = imx_ep->imx_usb;
+
+ return (__raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)))
+ & EPSTAT_BCOUNT) >> 16;
+}
+
+void imx_flush(struct imx_ep_struct *imx_ep)
+{
+ struct imx_udc_struct *imx_usb = imx_ep->imx_usb;
+
+ int temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+ __raw_writel(temp | EPSTAT_FLUSH,
+ imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+}
+
+void imx_ep_stall(struct imx_ep_struct *imx_ep)
+{
+ struct imx_udc_struct *imx_usb = imx_ep->imx_usb;
+ int temp, i;
+
+ D_ERR(imx_usb->dev, "<%s> Forced stall on %s\n", __func__, imx_ep->ep.name);
+
+ imx_flush(imx_ep);
+
+ /* Special care for ep0 */
+ if (EP_NO(imx_ep)) {
+ temp = __raw_readl(imx_usb->base + USB_CTRL);
+ __raw_writel(temp | CTRL_CMDOVER | CTRL_CMDERROR, imx_usb->base + USB_CTRL);
+ do { } while (__raw_readl(imx_usb->base + USB_CTRL) & CTRL_CMDOVER);
+ temp = __raw_readl(imx_usb->base + USB_CTRL);
+ __raw_writel(temp & ~CTRL_CMDERROR, imx_usb->base + USB_CTRL);
+ }
+ else {
+ temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+ __raw_writel(temp | EPSTAT_STALL,
+ imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+
+ for (i = 0; i < 100; i ++) {
+ temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+ if (!temp & EPSTAT_STALL)
+ break;
+ udelay(20);
+ }
+ if (i == 50)
+ D_ERR(imx_usb->dev, "<%s> Non finished stall on %s\n",
+ __func__, imx_ep->ep.name);
+ }
+}
+
+static int imx_udc_get_frame(struct usb_gadget *_gadget)
+{
+ struct imx_udc_struct *imx_usb = container_of(_gadget,
+ struct imx_udc_struct, gadget);
+
+ return __raw_readl(imx_usb->base + USB_FRAME) & 0x7FF;
+}
+
+static int imx_udc_wakeup(struct usb_gadget *_gadget)
+{
+ return 0;
+}
+
+/*******************************************************************************
+ * USB request control functions
+ *******************************************************************************
+ */
+
+static void ep_add_request(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ if (unlikely(!req))
+ return;
+
+ req->in_use = 1;
+ list_add_tail(&req->queue, &imx_ep->queue);
+}
+
+static void ep_del_request(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ if (unlikely(!req))
+ return;
+
+ list_del_init(&req->queue);
+ req->in_use = 0;
+}
+
+static void done(struct imx_ep_struct *imx_ep, struct imx_request *req, int status)
+{
+ ep_del_request(imx_ep, req);
+
+ if (likely(req->req.status == -EINPROGRESS))
+ req->req.status = status;
+ else
+ status = req->req.status;
+
+ if (status && status != -ESHUTDOWN)
+ D_ERR(imx_ep->imx_usb->dev,
+ "<%s> complete %s req %p stat %d len %u/%u\n", __func__,
+ imx_ep->ep.name, &req->req, status,
+ req->req.actual, req->req.length);
+
+ req->req.complete(&imx_ep->ep, &req->req);
+}
+
+static void nuke(struct imx_ep_struct *imx_ep, int status)
+{
+ struct imx_request *req;
+
+ while (!list_empty(&imx_ep->queue)) {
+ req = list_entry(imx_ep->queue.next, struct imx_request, queue);
+ done(imx_ep, req, status);
+ }
+}
+
+/*******************************************************************************
+ * Data tansfer over USB functions
+ *******************************************************************************
+ */
+static int read_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ u8 *buf;
+ int bytes_ep, bufferspace, count, i;
+
+ bytes_ep = imx_fifo_bcount(imx_ep);
+ bufferspace = req->req.length - req->req.actual;
+
+ buf = req->req.buf + req->req.actual;
+ prefetchw(buf);
+
+ if (unlikely(imx_ep_empty(imx_ep)))
+ count = 0; /* zlp */
+ else
+ count = min(bytes_ep, bufferspace);
+
+ for (i = count; i > 0; i--)
+ *buf++ = __raw_readb(imx_ep->imx_usb->base
+ + USB_EP_FDAT0(EP_NO(imx_ep)));
+ req->req.actual += count;
+
+ return count;
+}
+
+static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ u8 *buf;
+ int length, count, temp;
+
+ buf = req->req.buf + req->req.actual;
+ prefetch(buf);
+
+ length = min(req->req.length - req->req.actual, (u32)imx_ep->fifosize);
+
+ if (imx_fifo_bcount(imx_ep) + length > imx_ep->fifosize) {
+ D_TRX(imx_ep->imx_usb->dev, "<%s> packet overfill %s fifo\n",
+ __func__, imx_ep->ep.name);
+ return -1;
+ }
+
+ req->req.actual += length;
+ count = length;
+
+ if (!count && req->req.zero) { /* zlp */
+ temp = __raw_readl(imx_ep->imx_usb->base
+ + USB_EP_STAT(EP_NO(imx_ep)));
+ __raw_writel(temp | EPSTAT_ZLPS, imx_ep->imx_usb->base
+ + USB_EP_STAT(EP_NO(imx_ep)));
+ D_TRX(imx_ep->imx_usb->dev, "<%s> zero packet\n", __func__);
+ return 0;
+ }
+
+ while (count--) {
+ if (count == 0) { /* last byte */
+ temp = __raw_readl(imx_ep->imx_usb->base
+ + USB_EP_FCTRL(EP_NO(imx_ep)));
+ __raw_writel(temp | FCTRL_WFR, imx_ep->imx_usb->base
+ + USB_EP_FCTRL(EP_NO(imx_ep)));
+ }
+ __raw_writeb(*buf++,
+ imx_ep->imx_usb->base + USB_EP_FDAT0(EP_NO(imx_ep)));
+ }
+
+ return length;
+}
+
+static int read_fifo(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ int bytes = 0,
+ count,
+ completed = 0;
+
+ while (__raw_readl(imx_ep->imx_usb->base + USB_EP_FSTAT(EP_NO(imx_ep)))
+ & FSTAT_FR) {
+ count = read_packet(imx_ep, req);
+ bytes += count;
+
+ completed = (count != imx_ep->fifosize);
+ if (completed || req->req.actual == req->req.length) {
+ completed = 1;
+ break;
+ }
+ }
+
+ if (completed || !req->req.length) {
+ done(imx_ep, req, 0);
+ D_REQ(imx_ep->imx_usb->dev, "<%s> %s req<%p> %s\n",
+ __func__, imx_ep->ep.name, req,
+ completed ? "completed" : "not completed");
+ if (!EP_NO(imx_ep))
+ ep0_chg_stat(__func__, imx_ep->imx_usb, EP0_IDLE);
+ }
+
+ D_TRX(imx_ep->imx_usb->dev, "<%s> bytes read: %d\n", __func__, bytes);
+
+ return completed;
+}
+
+static int write_fifo(struct imx_ep_struct *imx_ep, struct imx_request *req)
+{
+ int bytes = 0,
+ count,
+ completed = 0;
+
+ while (!completed) {
+ count = write_packet(imx_ep, req);
+ if (count < 0)
+ break; /* busy */
+ bytes += count;
+
+ /* last packet "must be" short (or a zlp) */
+ completed = (count != imx_ep->fifosize);
+
+ if (unlikely(completed)) {
+ done(imx_ep, req, 0);
+ D_REQ(imx_ep->imx_usb->dev, "<%s> %s req<%p> %s\n",
+ __func__, imx_ep->ep.name, req,
+ completed ? "completed" : "not completed");
+ if (!EP_NO(imx_ep))
+ ep0_chg_stat(__func__, imx_ep->imx_usb, EP0_IDLE);
+ }
+ }
+
+ D_TRX(imx_ep->imx_usb->dev, "<%s> bytes sent: %d\n", __func__, bytes);
+
+ return completed;
+}
+
+/*******************************************************************************
+ * Endpoint handlers
+ *******************************************************************************
+ */
+static int handle_ep(struct imx_ep_struct *imx_ep)
+{
+ struct imx_request *req;
+ int completed = 0;
+
+ do {
+ if (!list_empty(&imx_ep->queue))
+ req = list_entry(imx_ep->queue.next,
+ struct imx_request, queue);
+ else {
+ D_REQ(imx_ep->imx_usb->dev, "<%s> no request on %s\n",
+ __func__, imx_ep->ep.name);
+ return 0;
+ }
+
+ if (EP_DIR(imx_ep)) /* to host */
+ completed = write_fifo(imx_ep, req);
+ else /* to device */
+ completed = read_fifo(imx_ep, req);
+
+ dump_ep_stat(__func__, imx_ep);
+
+ } while (completed);
+
+ return 0;
+}
+
+static int handle_ep0(struct imx_ep_struct *imx_ep)
+{
+ struct imx_request *req = NULL;
+ int ret = 0;
+
+ if (!list_empty(&imx_ep->queue))
+ req = list_entry(imx_ep->queue.next, struct imx_request, queue);
+
+ if (req) {
+ switch (imx_ep->imx_usb->ep0state) {
+
+ case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR */
+ write_fifo(imx_ep, req);
+ break;
+ case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR */
+ read_fifo(imx_ep, req);
+ break;
+ default:
+ D_EP0(imx_ep->imx_usb->dev,
+ "<%s> ep0 i/o, odd state %d\n",
+ __func__, imx_ep->imx_usb->ep0state);
+ ep_del_request(imx_ep, req);
+ ret = -EL2HLT;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void handle_ep0_devreq(struct imx_udc_struct *imx_usb)
+{
+ struct imx_ep_struct *imx_ep = &imx_usb->imx_ep[0];
+ union {
+ struct usb_ctrlrequest r;
+ u8 raw[8];
+ u32 word[2];
+ } u;
+ int temp, i;
+
+ nuke(imx_ep, -EPROTO);
+
+ /* read SETUP packet */
+ for (i = 0; i < 2; i++) {
+ if (imx_ep_empty(imx_ep)) {
+ D_ERR(imx_usb->dev,
+ "<%s> no setup packet received\n", __func__);
+ goto stall;
+ }
+ u.word[i] = __raw_readl(imx_usb->base + USB_EP_FDAT(EP_NO(imx_ep)));
+ }
+
+ temp = imx_ep_empty(imx_ep);
+ while (!imx_ep_empty(imx_ep)) {
+ i = __raw_readl(imx_usb->base + USB_EP_FDAT(EP_NO(imx_ep)));
+ D_ERR(imx_usb->dev,
+ "<%s> wrong to have extra bytes for setup : 0x%08x\n",
+ __func__, i);
+ }
+ if (!temp)
+ goto stall;
+
+ le16_to_cpus(&u.r.wValue);
+ le16_to_cpus(&u.r.wIndex);
+ le16_to_cpus(&u.r.wLength);
+
+ D_REQ(imx_usb->dev, "<%s> SETUP %02x.%02x v%04x i%04x l%04x\n",
+ __func__, u.r.bRequestType, u.r.bRequest,
+ u.r.wValue, u.r.wIndex, u.r.wLength);
+
+ if (imx_usb->set_config) {
+ /* NACK the host by using CMDOVER */
+ temp = __raw_readl(imx_usb->base + USB_CTRL);
+ __raw_writel(temp | CTRL_CMDOVER, imx_usb->base + USB_CTRL);
+
+ D_ERR(imx_usb->dev,
+ "<%s> set config req is pending, NACK the host\n",
+ __func__);
+ return;
+ }
+
+ if (u.r.bRequestType & USB_DIR_IN)
+ ep0_chg_stat(__func__, imx_usb, EP0_IN_DATA_PHASE);
+ else
+ ep0_chg_stat(__func__, imx_usb, EP0_OUT_DATA_PHASE);
+
+ i = imx_usb->driver->setup(&imx_usb->gadget, &u.r);
+ if (i < 0) {
+ D_ERR(imx_usb->dev, "<%s> device setup error %d\n",
+ __func__, i);
+ goto stall;
+ }
+
+ return;
+stall:
+ D_ERR(imx_usb->dev, "<%s> protocol STALL\n", __func__);
+ imx_ep_stall(imx_ep);
+ ep0_chg_stat(__func__, imx_usb, EP0_STALL);
+ return;
+}
+
+/*******************************************************************************
+ * USB gadget callback functions
+ *******************************************************************************
+ */
+
+static int imx_ep_enable(struct usb_ep *usb_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct imx_ep_struct *imx_ep = container_of(usb_ep,
+ struct imx_ep_struct, ep);
+ struct imx_udc_struct *imx_usb = imx_ep->imx_usb;
+ unsigned long flags;
+
+ if (!usb_ep
+ || !desc
+ || !EP_NO(imx_ep)
+ || desc->bDescriptorType != USB_DT_ENDPOINT
+ || imx_ep->bEndpointAddress != desc->bEndpointAddress) {
+ D_ERR(imx_usb->dev,
+ "<%s> bad ep or descriptor\n", __func__);
+ return -EINVAL;
+ }
+
+ if (imx_ep->bmAttributes != desc->bmAttributes) {
+ D_ERR(imx_usb->dev,
+ "<%s> %s type mismatch\n", __func__, usb_ep->name);
+ return -EINVAL;
+ }
+
+ if (imx_ep->fifosize < le16_to_cpu(desc->wMaxPacketSize)) {
+ D_ERR(imx_usb->dev,
+ "<%s> bad %s maxpacket\n", __func__, usb_ep->name);
+ return -ERANGE;
+ }
+
+ if (!imx_usb->driver || imx_usb->gadget.speed == USB_SPEED_UNKNOWN) {
+ D_ERR(imx_usb->dev, "<%s> bogus device state\n", __func__);
+ return -ESHUTDOWN;
+ }
+
+ local_irq_save(flags);
+
+ imx_ep->stopped = 0;
+ imx_flush(imx_ep);
+ imx_ep_irq_enable(imx_ep);
+
+ local_irq_restore(flags);
+
+ D_EPX(imx_usb->dev, "<%s> ENABLED %s\n", __func__, usb_ep->name);
+ return 0;
+}
+
+static int imx_ep_disable(struct usb_ep *usb_ep)
+{
+ struct imx_ep_struct *imx_ep = container_of(usb_ep,
+ struct imx_ep_struct, ep);
+ unsigned long flags;
+
+ if (!usb_ep || !EP_NO(imx_ep) || !list_empty(&imx_ep->queue)) {
+ D_ERR(imx_ep->imx_usb->dev, "<%s> %s can not be disabled\n",
+ __func__, usb_ep ? imx_ep->ep.name : NULL);
+ return -EINVAL;
+ }
+
+ local_irq_save(flags);
+
+ imx_ep->stopped = 1;
+ nuke(imx_ep, -ESHUTDOWN);
+ imx_flush(imx_ep);
+ imx_ep_irq_disable(imx_ep);
+
+ local_irq_restore(flags);
+
+ D_EPX(imx_ep->imx_usb->dev,
+ "<%s> DISABLED %s\n", __func__, usb_ep->name);
+ return 0;
+}
+
+static struct usb_request *imx_ep_alloc_request
+ (struct usb_ep *usb_ep, gfp_t gfp_flags)
+{
+ struct imx_request *req;
+
+ req = kzalloc(sizeof *req, gfp_flags);
+ if (!req || !usb_ep)
+ return 0;
+
+ INIT_LIST_HEAD(&req->queue);
+ req->in_use = 0;
+
+ return &req->req;
+}
+
+static void imx_ep_free_request
+ (struct usb_ep *usb_ep, struct usb_request *usb_req)
+{
+ struct imx_request *req;
+
+ req = container_of(usb_req, struct imx_request, req);
+ WARN_ON(!list_empty(&req->queue));
+ kfree(req);
+}
+
+static int imx_ep_queue
+ (struct usb_ep *usb_ep, struct usb_request *usb_req, gfp_t gfp_flags)
+{
+ struct imx_ep_struct *imx_ep;
+ struct imx_udc_struct *imx_usb;
+ struct imx_request *req;
+ unsigned long flags;
+ int ret = 0;
+
+ imx_ep = container_of(usb_ep, struct imx_ep_struct, ep);
+ imx_usb = imx_ep->imx_usb;
+ req = container_of(usb_req, struct imx_request, req);
+
+ /*
+ Special care on IMX udc.
+ Ignore enqueue when after set configuration from the
+ host. This assume all gadget drivers reply set
+ configuration with the next ep0 req enqueue.
+ */
+ if (imx_usb->set_config && !EP_NO(imx_ep)) {
+ imx_usb->set_config = 0;
+ D_EPX(imx_usb->dev,
+ "<%s> gadget reply set config\n", __func__);
+ return 0;
+ }
+
+ if (unlikely(!usb_req || !req || !usb_req->complete || !usb_req->buf)) {
+ D_ERR(imx_usb->dev, "<%s> bad params\n", __func__);
+ return -EINVAL;
+ }
+
+ if (unlikely(!usb_ep || !imx_ep)) {
+ D_ERR(imx_usb->dev, "<%s> bad ep\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!imx_usb->driver || imx_usb->gadget.speed == USB_SPEED_UNKNOWN) {
+ D_ERR(imx_usb->dev, "<%s> bogus device state\n", __func__);
+ return -ESHUTDOWN;
+ }
+
+ local_irq_save(flags);
+
+ /* Debug */
+ D_REQ(imx_usb->dev, "<%s> ep%d %s request for [%d] bytes\n",
+ __func__, EP_NO(imx_ep),
+ ((!EP_NO(imx_ep) && imx_ep->imx_usb->ep0state == EP0_IN_DATA_PHASE)
+ || (EP_NO(imx_ep) && EP_DIR(imx_ep))) ? "IN" : "OUT", usb_req->length);
+ dump_req(__func__, imx_ep, usb_req);
+
+ if (imx_ep->stopped) {
+ usb_req->status = -ESHUTDOWN;
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+
+ if (req->in_use) {
+ D_ERR(imx_usb->dev,
+ "<%s> refusing to queue req %p (already queued)\n",
+ __func__, req);
+ goto out;
+ }
+
+ usb_req->status = -EINPROGRESS;
+ usb_req->actual = 0;
+
+ ep_add_request(imx_ep, req);
+
+ if (!EP_NO(imx_ep))
+ ret = handle_ep0(imx_ep);
+ else
+ ret = handle_ep(imx_ep);
+out:
+ local_irq_restore(flags);
+ return ret;
+}
+
+static int imx_ep_dequeue(struct usb_ep *usb_ep, struct usb_request *usb_req)
+{
+
+ struct imx_ep_struct *imx_ep = container_of
+ (usb_ep, struct imx_ep_struct, ep);
+ struct imx_request *req;
+ unsigned long flags;
+
+ if (unlikely(!usb_ep || !EP_NO(imx_ep))) {
+ D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__);
+ return -EINVAL;
+ }
+
+ local_irq_save(flags);
+
+ /* make sure it's actually queued on this endpoint */
+ list_for_each_entry(req, &imx_ep->queue, queue) {
+ if (&req->req == usb_req)
+ break;
+ }
+ if (&req->req != usb_req) {
+ local_irq_restore(flags);
+ return -EINVAL;
+ }
+
+ done(imx_ep, req, -ECONNRESET);
+
+ local_irq_restore(flags);
+ return 0;
+}
+
+static int imx_ep_set_halt(struct usb_ep *usb_ep, int value)
+{
+ struct imx_ep_struct *imx_ep = container_of
+ (usb_ep, struct imx_ep_struct, ep);
+ unsigned long flags;
+
+ if (unlikely(!usb_ep || !EP_NO(imx_ep))) {
+ D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__);
+ return -EINVAL;
+ }
+
+ local_irq_save(flags);
+
+ if ((imx_ep->bEndpointAddress & USB_DIR_IN)
+ && !list_empty(&imx_ep->queue)) {
+ local_irq_restore(flags);
+ return -EAGAIN;
+ }
+
+ imx_ep_stall(imx_ep);
+
+ local_irq_restore(flags);
+
+ D_EPX(imx_ep->imx_usb->dev, "<%s> %s halt\n", __func__, usb_ep->name);
+ return 0;
+}
+
+static int imx_ep_fifo_status(struct usb_ep *usb_ep)
+{
+ struct imx_ep_struct *imx_ep = container_of
+ (usb_ep, struct imx_ep_struct, ep);
+
+ if (!usb_ep) {
+ D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__);
+ return -ENODEV;
+ }
+
+ if (imx_ep->imx_usb->gadget.speed == USB_SPEED_UNKNOWN)
+ return 0;
+ else
+ return imx_fifo_bcount(imx_ep);
+}
+
+static void imx_ep_fifo_flush(struct usb_ep *usb_ep)
+{
+ struct imx_ep_struct *imx_ep = container_of
+ (usb_ep, struct imx_ep_struct, ep);
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ if (!usb_ep || !EP_NO(imx_ep) || !list_empty(&imx_ep->queue)) {
+ D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__);
+ local_irq_restore(flags);
+ return;
+ }
+
+ /* toggle and halt bits stay unchanged */
+ imx_flush(imx_ep);
+
+ local_irq_restore(flags);
+}
+
+static struct usb_ep_ops imx_ep_ops = {
+ .enable = imx_ep_enable,
+ .disable = imx_ep_disable,
+
+ .alloc_request = imx_ep_alloc_request,
+ .free_request = imx_ep_free_request,
+
+ .queue = imx_ep_queue,
+ .dequeue = imx_ep_dequeue,
+
+ .set_halt = imx_ep_set_halt,
+ .fifo_status = imx_ep_fifo_status,
+ .fifo_flush = imx_ep_fifo_flush,
+};
+
+/*******************************************************************************
+ * USB endpoint control functions
+ *******************************************************************************
+ */
+
+void ep0_chg_stat(const char *label,
+ struct imx_udc_struct *imx_usb, enum ep0_state stat)
+{
+ D_EP0(imx_usb->dev, "<%s> from %15s to %15s\n",
+ label, state_name[imx_usb->ep0state], state_name[stat]);
+
+ if (imx_usb->ep0state == stat)
+ return;
+
+ imx_usb->ep0state = stat;
+}
+
+static void usb_init_data(struct imx_udc_struct *imx_usb)
+{
+ struct imx_ep_struct *imx_ep;
+ u8 i;
+
+ /* device/ep0 records init */
+ INIT_LIST_HEAD(&imx_usb->gadget.ep_list);
+ INIT_LIST_HEAD(&imx_usb->gadget.ep0->ep_list);
+ ep0_chg_stat(__func__, imx_usb, EP0_IDLE);
+
+ /* basic endpoint records init */
+ for (i = 0; i < IMX_USB_NB_EP; i++) {
+ imx_ep = &imx_usb->imx_ep[i];
+
+ if (i) {
+ list_add_tail(&imx_ep->ep.ep_list,
+ &imx_usb->gadget.ep_list);
+ imx_ep->stopped = 1;
+ } else
+ imx_ep->stopped = 0;
+
+ INIT_LIST_HEAD(&imx_ep->queue);
+ }
+}
+
+static void udc_stop_activity(struct imx_udc_struct *imx_usb,
+ struct usb_gadget_driver *driver)
+{
+ struct imx_ep_struct *imx_ep;
+ int i;
+
+ if (imx_usb->gadget.speed == USB_SPEED_UNKNOWN)
+ driver = NULL;
+
+ /* prevent new request submissions, kill any outstanding requests */
+ for (i = 1; i < IMX_USB_NB_EP; i++) {
+ imx_ep = &imx_usb->imx_ep[i];
+ imx_flush(imx_ep);
+ imx_ep->stopped = 1;
+ imx_ep_irq_disable(imx_ep);
+ nuke(imx_ep, -ESHUTDOWN);
+ }
+
+ imx_usb->cfg = 0;
+ imx_usb->intf = 0;
+ imx_usb->alt = 0;
+
+ if (driver)
+ driver->disconnect(&imx_usb->gadget);
+}
+
+/*******************************************************************************
+ * Interrupt handlers
+ *******************************************************************************
+ */
+
+static irqreturn_t imx_udc_irq(int irq, void *dev)
+{
+ struct imx_udc_struct *imx_usb = dev;
+ struct usb_ctrlrequest u;
+ int temp, cfg, intf, alt;
+ int intr = __raw_readl(imx_usb->base + USB_INTR);
+
+ if (intr & (INTR_WAKEUP | INTR_SUSPEND | INTR_RESUME | INTR_RESET_START
+ | INTR_RESET_STOP | INTR_CFG_CHG)) {
+ dump_intr(__func__, intr, imx_usb->dev);
+ dump_usb_stat(__func__, imx_usb);
+ }
+
+ if (!imx_usb->driver) {
+ /*imx_udc_disable(imx_usb);*/
+ goto end_irq;
+ }
+
+ if (intr & INTR_WAKEUP) {
+ if (imx_usb->gadget.speed == USB_SPEED_UNKNOWN
+ && imx_usb->driver && imx_usb->driver->resume)
+ imx_usb->driver->resume(&imx_usb->gadget);
+ imx_usb->set_config = 0;
+ imx_usb->gadget.speed = USB_SPEED_FULL;
+ }
+
+ if (intr & INTR_SUSPEND) {
+ if (imx_usb->gadget.speed != USB_SPEED_UNKNOWN
+ && imx_usb->driver && imx_usb->driver->suspend)
+ imx_usb->driver->suspend(&imx_usb->gadget);
+ imx_usb->set_config = 0;
+ imx_usb->gadget.speed = USB_SPEED_UNKNOWN;
+ }
+
+ if (intr & INTR_RESET_START) {
+ __raw_writel(intr, imx_usb->base + USB_INTR);
+ udc_stop_activity(imx_usb, imx_usb->driver);
+ imx_usb->set_config = 0;
+ imx_usb->gadget.speed = USB_SPEED_UNKNOWN;
+ }
+
+ if (intr & INTR_RESET_STOP)
+ imx_usb->gadget.speed = USB_SPEED_FULL;
+
+ if (intr & INTR_CFG_CHG) {
+ __raw_writel(INTR_CFG_CHG, imx_usb->base + USB_INTR);
+ temp = __raw_readl(imx_usb->base + USB_STAT);
+ cfg = (temp & STAT_CFG) >> 5;
+ intf = (temp & STAT_INTF) >> 3;
+ alt = temp & STAT_ALTSET;
+
+ D_REQ(imx_usb->dev,
+ "<%s> orig config C=%d, I=%d, A=%d / "
+ "req config C=%d, I=%d, A=%d\n",
+ __func__, imx_usb->cfg, imx_usb->intf, imx_usb->alt,
+ cfg, intf, alt);
+
+ if (cfg != 1 && cfg != 2)
+ goto end_irq;
+
+ imx_usb->set_config = 0;
+
+ /* Config setup */
+ if (imx_usb->cfg != cfg) {
+ D_REQ(imx_usb->dev, "<%s> Change config start\n",__func__);
+ u.bRequest = USB_REQ_SET_CONFIGURATION;
+ u.bRequestType = USB_DIR_OUT |
+ USB_TYPE_STANDARD |
+ USB_RECIP_DEVICE;
+ u.wValue = cfg;
+ u.wIndex = 0;
+ u.wLength = 0;
+ imx_usb->cfg = cfg;
+ imx_usb->set_config = 1;
+ imx_usb->driver->setup(&imx_usb->gadget, &u);
+ imx_usb->set_config = 0;
+ D_REQ(imx_usb->dev, "<%s> Change config done\n",__func__);
+
+ }
+ if (imx_usb->intf != intf || imx_usb->alt != alt) {
+ D_REQ(imx_usb->dev, "<%s> Change interface start\n",__func__);
+ u.bRequest = USB_REQ_SET_INTERFACE;
+ u.bRequestType = USB_DIR_OUT |
+ USB_TYPE_STANDARD |
+ USB_RECIP_INTERFACE;
+ u.wValue = alt;
+ u.wIndex = intf;
+ u.wLength = 0;
+ imx_usb->intf = intf;
+ imx_usb->alt = alt;
+ imx_usb->set_config = 1;
+ imx_usb->driver->setup(&imx_usb->gadget, &u);
+ imx_usb->set_config = 0;
+ D_REQ(imx_usb->dev, "<%s> Change interface done\n",__func__);
+ }
+ }
+
+ if (intr & INTR_SOF) {
+ if (imx_usb->ep0state == EP0_IDLE) {
+ temp = __raw_readl(imx_usb->base + USB_CTRL);
+ __raw_writel(temp | CTRL_CMDOVER, imx_usb->base + USB_CTRL);
+ }
+ }
+
+end_irq:
+ __raw_writel(intr, imx_usb->base + USB_INTR);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t imx_udc_ctrl_irq(int irq, void *dev)
+{
+ struct imx_udc_struct *imx_usb = dev;
+ int intr = __raw_readl(imx_usb->base + USB_EP_INTR(0));
+
+ dump_ep_intr(__func__, 0, intr, imx_usb->dev);
+
+ if (!imx_usb->driver) {
+ __raw_writel(intr, imx_usb->base + USB_EP_INTR(0));
+ return IRQ_HANDLED;
+ }
+
+ /* DEVREQ IRQ has highest priority */
+ if (intr & (EPINTR_DEVREQ | EPINTR_MDEVREQ))
+ handle_ep0_devreq(imx_usb);
+ /* Seem i.MX is missing EOF interrupt sometimes.
+ * Therefore we monitor both EOF and FIFO_EMPTY interrups
+ * when transmiting, and both EOF and FIFO_FULL when
+ * receiving data.
+ */
+ else if (intr & (EPINTR_EOF | EPINTR_FIFO_EMPTY | EPINTR_FIFO_FULL))
+ handle_ep0(&imx_usb->imx_ep[0]);
+
+ __raw_writel(intr, imx_usb->base + USB_EP_INTR(0));
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t imx_udc_bulk_irq(int irq, void *dev)
+{
+ struct imx_udc_struct *imx_usb = dev;
+ struct imx_ep_struct *imx_ep = &imx_usb->imx_ep[irq - USBD_INT0];
+ int intr = __raw_readl(imx_usb->base + USB_EP_INTR(EP_NO(imx_ep)));
+
+ dump_ep_intr(__func__, irq - USBD_INT0, intr, imx_usb->dev);
+
+ if (!imx_usb->driver) {
+ __raw_writel(intr, imx_usb->base + USB_EP_INTR(EP_NO(imx_ep)));
+ return IRQ_HANDLED;
+ }
+
+ handle_ep(imx_ep);
+
+ __raw_writel(intr, imx_usb->base + USB_EP_INTR(EP_NO(imx_ep)));
+
+ return IRQ_HANDLED;
+}
+
+irq_handler_t intr_handler(int i)
+{
+ switch (i) {
+ case 0:
+ return imx_udc_ctrl_irq;
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ return imx_udc_bulk_irq;
+ default:
+ return imx_udc_irq;
+ }
+}
+
+/*******************************************************************************
+ * Static defined IMX UDC structure
+ *******************************************************************************
+ */
+
+static const struct usb_gadget_ops imx_udc_ops = {
+ .get_frame = imx_udc_get_frame,
+ .wakeup = imx_udc_wakeup,
+};
+
+static struct imx_udc_struct controller = {
+ .gadget = {
+ .ops = &imx_udc_ops,
+ .ep0 = &controller.imx_ep[0].ep,
+ .name = driver_name,
+ .dev = {
+ .bus_id = "gadget",
+ },
+ },
+
+ .imx_ep[0] = {
+ .ep = {
+ .name = ep0name,
+ .ops = &imx_ep_ops,
+ .maxpacket = 32,
+ },
+ .imx_usb = &controller,
+ .fifosize = 32,
+ .bEndpointAddress = 0,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ },
+ .imx_ep[1] = {
+ .ep = {
+ .name = "ep1in-bulk",
+ .ops = &imx_ep_ops,
+ .maxpacket = 64,
+ },
+ .imx_usb = &controller,
+ .fifosize = 64,
+ .bEndpointAddress = USB_DIR_IN | 1,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ },
+ .imx_ep[2] = {
+ .ep = {
+ .name = "ep2out-bulk",
+ .ops = &imx_ep_ops,
+ .maxpacket = 64,
+ },
+ .imx_usb = &controller,
+ .fifosize = 64,
+ .bEndpointAddress = USB_DIR_OUT | 2,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ },
+ .imx_ep[3] = {
+ .ep = {
+ .name = "ep3out-bulk",
+ .ops = &imx_ep_ops,
+ .maxpacket = 32,
+ },
+ .imx_usb = &controller,
+ .fifosize = 32,
+ .bEndpointAddress = USB_DIR_OUT | 3,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ },
+ .imx_ep[4] = {
+ .ep = {
+ .name = "ep4in-int",
+ .ops = &imx_ep_ops,
+ .maxpacket = 32,
+ },
+ .imx_usb = &controller,
+ .fifosize = 32,
+ .bEndpointAddress = USB_DIR_IN | 4,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ },
+ .imx_ep[5] = {
+ .ep = {
+ .name = "ep5out-int",
+ .ops = &imx_ep_ops,
+ .maxpacket = 32,
+ },
+ .imx_usb = &controller,
+ .fifosize = 32,
+ .bEndpointAddress = USB_DIR_OUT | 5,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ },
+};
+
+/*******************************************************************************
+ * USB gadged driver functions
+ *******************************************************************************
+ */
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+ struct imx_udc_struct *imx_usb = &controller;
+ int retval;
+
+ if (!driver
+ || driver->speed < USB_SPEED_FULL
+ || !driver->bind
+ || !driver->disconnect
+ || !driver->setup)
+ return -EINVAL;
+ if (!imx_usb)
+ return -ENODEV;
+ if (imx_usb->driver)
+ return -EBUSY;
+
+ /* first hook up the driver ... */
+ imx_usb->driver = driver;
+ imx_usb->gadget.dev.driver = &driver->driver;
+
+ retval = device_add(&imx_usb->gadget.dev);
+ if (retval)
+ goto fail;
+ retval = driver->bind(&imx_usb->gadget);
+ if (retval) {
+ D_ERR(imx_usb->dev, "<%s> bind to driver %s --> error %d\n",
+ __func__, driver->driver.name, retval);
+ device_del(&imx_usb->gadget.dev);
+
+ goto fail;
+ }
+
+ D_INI(imx_usb->dev, "<%s> registered gadget driver '%s'\n",
+ __func__, driver->driver.name);
+
+ imx_udc_enable(imx_usb);
+
+ return 0;
+fail:
+ imx_usb->driver = NULL;
+ imx_usb->gadget.dev.driver = NULL;
+ return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+ struct imx_udc_struct *imx_usb = &controller;
+
+ if (!imx_usb)
+ return -ENODEV;
+ if (!driver || driver != imx_usb->driver || !driver->unbind)
+ return -EINVAL;
+
+ udc_stop_activity(imx_usb, driver);
+ imx_udc_disable(imx_usb);
+
+ driver->unbind(&imx_usb->gadget);
+ imx_usb->gadget.dev.driver = NULL;
+ imx_usb->driver = NULL;
+
+ device_del(&imx_usb->gadget.dev);
+
+ D_INI(imx_usb->dev, "<%s> unregistered gadget driver '%s'\n",
+ __func__, driver->driver.name);
+
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+/*******************************************************************************
+ * Module functions
+ *******************************************************************************
+ */
+
+static int __init imx_udc_probe(struct platform_device *pdev)
+{
+ struct imx_udc_struct *imx_usb = &controller;
+ struct resource *res;
+ struct imxusb_platform_data *pdata;
+ struct clk *clk;
+ void __iomem *base;
+ int ret = 0;
+ int i, res_size;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't get device resources\n");
+ return -ENODEV;
+ }
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "driver needs platform data\n");
+ return -ENODEV;
+ }
+
+ res_size = res->end - res->start + 1;
+ if (!request_mem_region(res->start, res_size, res->name)) {
+ dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
+ res_size, res->start);
+ return -ENOMEM;
+ }
+
+ if (pdata->init) {
+ ret = pdata->init(&pdev->dev);
+ if (ret)
+ goto fail0;
+ }
+
+ base = ioremap(res->start, res_size);
+ if (!base) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ ret = -EIO;
+ goto fail1;
+ }
+
+ clk = clk_get(NULL, "usbd_clk");
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ dev_err(&pdev->dev, "can't get USB clock\n");
+ goto fail2;
+ }
+ clk_enable(clk);
+
+ if (clk_get_rate(clk) != 48000000) {
+ D_INI(&pdev->dev,
+ "Bad USB clock (%d Hz), changing to 48000000 Hz\n",
+ (int)clk_get_rate(clk));
+ if (clk_set_rate(clk, 48000000)) {
+ dev_err(&pdev->dev,
+ "Unable to set correct USB clock (48MHz)\n");
+ ret = -EIO;
+ goto fail3;
+ }
+ }
+
+ for (i = 0; i < IMX_USB_NB_EP + 1; i++) {
+ imx_usb->usbd_int[i] = platform_get_irq(pdev, i);
+ if (imx_usb->usbd_int[i] < 0) {
+ dev_err(&pdev->dev, "can't get irq number\n");
+ ret = -ENODEV;
+ goto fail3;
+ }
+ }
+
+ for (i = 0; i < IMX_USB_NB_EP + 1; i++) {
+ ret = request_irq(imx_usb->usbd_int[i], intr_handler(i),
+ IRQF_DISABLED, driver_name, imx_usb);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get irq %i, err %d\n",
+ imx_usb->usbd_int[i], ret);
+ for (--i; i >= 0; i--)
+ free_irq(imx_usb->usbd_int[i], imx_usb);
+ goto fail3;
+ }
+ }
+
+ imx_usb->res = res;
+ imx_usb->base = base;
+ imx_usb->clk = clk;
+ imx_usb->dev = &pdev->dev;
+
+ device_initialize(&imx_usb->gadget.dev);
+
+ imx_usb->gadget.dev.parent = &pdev->dev;
+ imx_usb->gadget.dev.dma_mask = pdev->dev.dma_mask;
+
+ platform_set_drvdata(pdev, imx_usb);
+
+ usb_init_data(imx_usb);
+ imx_udc_init(imx_usb);
+
+ return 0;
+
+fail3:
+ clk_put(clk);
+ clk_disable(clk);
+fail2:
+ iounmap(base);
+fail1:
+ if (pdata->exit)
+ pdata->exit(&pdev->dev);
+fail0:
+ release_mem_region(res->start, res_size);
+ return ret;
+}
+
+static int __exit imx_udc_remove(struct platform_device *pdev)
+{
+ struct imx_udc_struct *imx_usb = platform_get_drvdata(pdev);
+ struct imxusb_platform_data *pdata = pdev->dev.platform_data;
+ int i;
+
+ imx_udc_disable(imx_usb);
+
+ for (i = 0; i < IMX_USB_NB_EP + 1; i++)
+ free_irq(imx_usb->usbd_int[i], imx_usb);
+
+ clk_put(imx_usb->clk);
+ clk_disable(imx_usb->clk);
+ iounmap(imx_usb->base);
+
+ release_mem_region(imx_usb->res->start,
+ imx_usb->res->end - imx_usb->res->start + 1);
+
+ if (pdata->exit)
+ pdata->exit(&pdev->dev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+/*----------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+#define imx_udc_suspend NULL
+#define imx_udc_resume NULL
+#else
+#define imx_udc_suspend NULL
+#define imx_udc_resume NULL
+#endif
+
+/*----------------------------------------------------------------------------*/
+
+static struct platform_driver udc_driver = {
+ .driver = {
+ .name = driver_name,
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(imx_udc_remove),
+ .suspend = imx_udc_suspend,
+ .resume = imx_udc_resume,
+};
+
+static int __init udc_init(void)
+{
+ return platform_driver_probe(&udc_driver, imx_udc_probe);
+}
+module_init(udc_init);
+
+static void __exit udc_exit(void)
+{
+ platform_driver_unregister(&udc_driver);
+}
+module_exit(udc_exit);
+
+MODULE_DESCRIPTION("IMX USB Device Controller driver");
+MODULE_AUTHOR("Darius Augulis <augulis.darius@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx_udc");
--- /dev/null
+/*
+ * Copyright (C) 2005 Mike Lee(eemike@gmail.com)
+ *
+ * This udc driver is now under testing and code is based on pxa2xx_udc.h
+ * Please use it with your own risk!
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LINUX_USB_GADGET_IMX_H
+#define __LINUX_USB_GADGET_IMX_H
+
+#include <linux/types.h>
+
+/* Helper macros */
+#define EP_NO(ep) ((ep->bEndpointAddress) & ~USB_DIR_IN) /* IN:1, OUT:0 */
+#define EP_DIR(ep) ((ep->bEndpointAddress) & USB_DIR_IN ? 1 : 0)
+#define irq_to_ep(irq) (((irq) >= USBD_INT0) || ((irq) <= USBD_INT6) ? ((irq) - USBD_INT0) : (USBD_INT6)) /*should not happen*/
+#define ep_to_irq(ep) (EP_NO((ep)) + USBD_INT0)
+#define IMX_USB_NB_EP 6
+
+/* Driver structures */
+struct imx_request {
+ struct usb_request req;
+ struct list_head queue;
+ unsigned int in_use;
+};
+
+enum ep0_state {
+ EP0_IDLE,
+ EP0_IN_DATA_PHASE,
+ EP0_OUT_DATA_PHASE,
+ EP0_CONFIG,
+ EP0_STALL,
+};
+
+struct imx_ep_struct {
+ struct usb_ep ep;
+ struct imx_udc_struct *imx_usb;
+ struct list_head queue;
+ unsigned char stopped;
+ unsigned char fifosize;
+ unsigned char bEndpointAddress;
+ unsigned char bmAttributes;
+};
+
+struct imx_udc_struct {
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+ struct device *dev;
+ struct imx_ep_struct imx_ep[IMX_USB_NB_EP];
+ struct clk *clk;
+ enum ep0_state ep0state;
+ struct resource *res;
+ void __iomem *base;
+ unsigned char set_config;
+ int cfg,
+ intf,
+ alt,
+ usbd_int[7];
+};
+
+/* USB registers */
+#define USB_FRAME (0x00) /* USB frame */
+#define USB_SPEC (0x04) /* USB Spec */
+#define USB_STAT (0x08) /* USB Status */
+#define USB_CTRL (0x0C) /* USB Control */
+#define USB_DADR (0x10) /* USB Desc RAM addr */
+#define USB_DDAT (0x14) /* USB Desc RAM/EP buffer data */
+#define USB_INTR (0x18) /* USB interrupt */
+#define USB_MASK (0x1C) /* USB Mask */
+#define USB_ENAB (0x24) /* USB Enable */
+#define USB_EP_STAT(x) (0x30 + (x*0x30)) /* USB status/control */
+#define USB_EP_INTR(x) (0x34 + (x*0x30)) /* USB interrupt */
+#define USB_EP_MASK(x) (0x38 + (x*0x30)) /* USB mask */
+#define USB_EP_FDAT(x) (0x3C + (x*0x30)) /* USB FIFO data */
+#define USB_EP_FDAT0(x) (0x3C + (x*0x30)) /* USB FIFO data */
+#define USB_EP_FDAT1(x) (0x3D + (x*0x30)) /* USB FIFO data */
+#define USB_EP_FDAT2(x) (0x3E + (x*0x30)) /* USB FIFO data */
+#define USB_EP_FDAT3(x) (0x3F + (x*0x30)) /* USB FIFO data */
+#define USB_EP_FSTAT(x) (0x40 + (x*0x30)) /* USB FIFO status */
+#define USB_EP_FCTRL(x) (0x44 + (x*0x30)) /* USB FIFO control */
+#define USB_EP_LRFP(x) (0x48 + (x*0x30)) /* USB last read frame pointer */
+#define USB_EP_LWFP(x) (0x4C + (x*0x30)) /* USB last write frame pointer */
+#define USB_EP_FALRM(x) (0x50 + (x*0x30)) /* USB FIFO alarm */
+#define USB_EP_FRDP(x) (0x54 + (x*0x30)) /* USB FIFO read pointer */
+#define USB_EP_FWRP(x) (0x58 + (x*0x30)) /* USB FIFO write pointer */
+/* USB Control Register Bit Fields.*/
+#define CTRL_CMDOVER (1<<6) /* UDC status */
+#define CTRL_CMDERROR (1<<5) /* UDC status */
+#define CTRL_FE_ENA (1<<3) /* Enable Font End logic */
+#define CTRL_UDC_RST (1<<2) /* UDC reset */
+#define CTRL_AFE_ENA (1<<1) /* Analog Font end enable */
+#define CTRL_RESUME (1<<0) /* UDC resume */
+/* USB Status Register Bit Fields.*/
+#define STAT_RST (1<<8)
+#define STAT_SUSP (1<<7)
+#define STAT_CFG (3<<5)
+#define STAT_INTF (3<<3)
+#define STAT_ALTSET (7<<0)
+/* USB Interrupt Status/Mask Registers Bit fields */
+#define INTR_WAKEUP (1<<31) /* Wake up Interrupt */
+#define INTR_MSOF (1<<7) /* Missed Start of Frame */
+#define INTR_SOF (1<<6) /* Start of Frame */
+#define INTR_RESET_STOP (1<<5) /* Reset Signaling stop */
+#define INTR_RESET_START (1<<4) /* Reset Signaling start */
+#define INTR_RESUME (1<<3) /* Suspend to resume */
+#define INTR_SUSPEND (1<<2) /* Active to suspend */
+#define INTR_FRAME_MATCH (1<<1) /* Frame matched */
+#define INTR_CFG_CHG (1<<0) /* Configuration change occurred */
+/* USB Enable Register Bit Fields.*/
+#define ENAB_RST (1<<31) /* Reset USB modules */
+#define ENAB_ENAB (1<<30) /* Enable USB modules*/
+#define ENAB_SUSPEND (1<<29) /* Suspend USB modules */
+#define ENAB_ENDIAN (1<<28) /* Endian of USB modules */
+#define ENAB_PWRMD (1<<0) /* Power mode of USB modules */
+/* USB Descriptor Ram Address Register bit fields */
+#define DADR_CFG (1<<31) /* Configuration */
+#define DADR_BSY (1<<30) /* Busy status */
+#define DADR_DADR (0x1FF) /* Descriptor Ram Address */
+/* USB Descriptor RAM/Endpoint Buffer Data Register bit fields */
+#define DDAT_DDAT (0xFF) /* Descriptor Endpoint Buffer */
+/* USB Endpoint Status Register bit fields */
+#define EPSTAT_BCOUNT (0x7F<<16) /* Endpoint FIFO byte count */
+#define EPSTAT_SIP (1<<8) /* Endpoint setup in progress */
+#define EPSTAT_DIR (1<<7) /* Endpoint transfer direction */
+#define EPSTAT_MAX (3<<5) /* Endpoint Max packet size */
+#define EPSTAT_TYP (3<<3) /* Endpoint type */
+#define EPSTAT_ZLPS (1<<2) /* Send zero length packet */
+#define EPSTAT_FLUSH (1<<1) /* Endpoint FIFO Flush */
+#define EPSTAT_STALL (1<<0) /* Force stall */
+/* USB Endpoint FIFO Status Register bit fields */
+#define FSTAT_FRAME_STAT (0xF<<24) /* Frame status bit [0-3] */
+#define FSTAT_ERR (1<<22) /* FIFO error */
+#define FSTAT_UF (1<<21) /* FIFO underflow */
+#define FSTAT_OF (1<<20) /* FIFO overflow */
+#define FSTAT_FR (1<<19) /* FIFO frame ready */
+#define FSTAT_FULL (1<<18) /* FIFO full */
+#define FSTAT_ALRM (1<<17) /* FIFO alarm */
+#define FSTAT_EMPTY (1<<16) /* FIFO empty */
+/* USB Endpoint FIFO Control Register bit fields */
+#define FCTRL_WFR (1<<29) /* Write frame end */
+/* USB Endpoint Interrupt Status Regsiter bit fields */
+#define EPINTR_FIFO_FULL (1<<8) /* fifo full */
+#define EPINTR_FIFO_EMPTY (1<<7) /* fifo empty */
+#define EPINTR_FIFO_ERROR (1<<6) /* fifo error */
+#define EPINTR_FIFO_HIGH (1<<5) /* fifo high */
+#define EPINTR_FIFO_LOW (1<<4) /* fifo low */
+#define EPINTR_MDEVREQ (1<<3) /* multi Device request */
+#define EPINTR_EOT (1<<2) /* fifo end of transfer */
+#define EPINTR_DEVREQ (1<<1) /* Device request */
+#define EPINTR_EOF (1<<0) /* fifo end of frame */
+
+/* Debug macros */
+#ifdef DEBUG
+
+/* #define DEBUG_REQ */
+/* #define DEBUG_TRX */
+/* #define DEBUG_INIT */
+/* #define DEBUG_EP0 */
+/* #define DEBUG_EPX */
+/* #define DEBUG_IRQ */
+/* #define DEBUG_EPIRQ */
+/* #define DEBUG_DUMP */
+#define DEBUG_ERR
+
+#ifdef DEBUG_REQ
+ #define D_REQ(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_REQ(dev, args...) do {} while (0)
+#endif /* DEBUG_REQ */
+
+#ifdef DEBUG_TRX
+ #define D_TRX(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_TRX(dev, args...) do {} while (0)
+#endif /* DEBUG_TRX */
+
+#ifdef DEBUG_INIT
+ #define D_INI(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_INI(dev, args...) do {} while (0)
+#endif /* DEBUG_INIT */
+
+#ifdef DEBUG_EP0
+ static const char *state_name[] = {
+ "EP0_IDLE",
+ "EP0_IN_DATA_PHASE",
+ "EP0_OUT_DATA_PHASE",
+ "EP0_CONFIG",
+ "EP0_STALL"
+ };
+ #define D_EP0(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_EP0(dev, args...) do {} while (0)
+#endif /* DEBUG_EP0 */
+
+#ifdef DEBUG_EPX
+ #define D_EPX(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_EPX(dev, args...) do {} while (0)
+#endif /* DEBUG_EP0 */
+
+#ifdef DEBUG_IRQ
+ static void dump_intr(const char *label, int irqreg, struct device *dev)
+ {
+ dev_dbg(dev, "<%s> USB_INTR=[%s%s%s%s%s%s%s%s%s]\n", label,
+ (irqreg & INTR_WAKEUP) ? " wake" : "",
+ (irqreg & INTR_MSOF) ? " msof" : "",
+ (irqreg & INTR_SOF) ? " sof" : "",
+ (irqreg & INTR_RESUME) ? " resume" : "",
+ (irqreg & INTR_SUSPEND) ? " suspend" : "",
+ (irqreg & INTR_RESET_STOP) ? " noreset" : "",
+ (irqreg & INTR_RESET_START) ? " reset" : "",
+ (irqreg & INTR_FRAME_MATCH) ? " fmatch" : "",
+ (irqreg & INTR_CFG_CHG) ? " config" : "");
+ }
+#else
+ #define dump_intr(x, y, z) do {} while (0)
+#endif /* DEBUG_IRQ */
+
+#ifdef DEBUG_EPIRQ
+ static void dump_ep_intr(const char *label, int nr, int irqreg, struct device *dev)
+ {
+ dev_dbg(dev, "<%s> EP%d_INTR=[%s%s%s%s%s%s%s%s%s]\n", label, nr,
+ (irqreg & EPINTR_FIFO_FULL) ? " full" : "",
+ (irqreg & EPINTR_FIFO_EMPTY) ? " fempty" : "",
+ (irqreg & EPINTR_FIFO_ERROR) ? " ferr" : "",
+ (irqreg & EPINTR_FIFO_HIGH) ? " fhigh" : "",
+ (irqreg & EPINTR_FIFO_LOW) ? " flow" : "",
+ (irqreg & EPINTR_MDEVREQ) ? " mreq" : "",
+ (irqreg & EPINTR_EOF) ? " eof" : "",
+ (irqreg & EPINTR_DEVREQ) ? " devreq" : "",
+ (irqreg & EPINTR_EOT) ? " eot" : "");
+ }
+#else
+ #define dump_ep_intr(x, y, z, i) do {} while (0)
+#endif /* DEBUG_IRQ */
+
+#ifdef DEBUG_DUMP
+ static void dump_usb_stat(const char *label, struct imx_udc_struct *imx_usb)
+ {
+ int temp = __raw_readl(imx_usb->base + USB_STAT);
+
+ dev_dbg(imx_usb->dev,
+ "<%s> USB_STAT=[%s%s CFG=%d, INTF=%d, ALTR=%d]\n", label,
+ (temp & STAT_RST) ? " reset" : "",
+ (temp & STAT_SUSP) ? " suspend" : "",
+ (temp & STAT_CFG) >> 5,
+ (temp & STAT_INTF) >> 3,
+ (temp & STAT_ALTSET));
+ }
+
+ static void dump_ep_stat(const char *label, struct imx_ep_struct *imx_ep)
+ {
+ int temp = __raw_readl(imx_ep->imx_usb->base + USB_EP_INTR(EP_NO(imx_ep)));
+
+ dev_dbg(imx_ep->imx_usb->dev,
+ "<%s> EP%d_INTR=[%s%s%s%s%s%s%s%s%s]\n", label, EP_NO(imx_ep),
+ (temp & EPINTR_FIFO_FULL) ? " full" : "",
+ (temp & EPINTR_FIFO_EMPTY) ? " fempty" : "",
+ (temp & EPINTR_FIFO_ERROR) ? " ferr" : "",
+ (temp & EPINTR_FIFO_HIGH) ? " fhigh" : "",
+ (temp & EPINTR_FIFO_LOW) ? " flow" : "",
+ (temp & EPINTR_MDEVREQ) ? " mreq" : "",
+ (temp & EPINTR_EOF) ? " eof" : "",
+ (temp & EPINTR_DEVREQ) ? " devreq" : "",
+ (temp & EPINTR_EOT) ? " eot" : "");
+
+ temp = __raw_readl(imx_ep->imx_usb->base + USB_EP_STAT(EP_NO(imx_ep)));
+
+ dev_dbg(imx_ep->imx_usb->dev,
+ "<%s> EP%d_STAT=[%s%s bcount=%d]\n", label, EP_NO(imx_ep),
+ (temp & EPSTAT_SIP) ? " sip" : "",
+ (temp & EPSTAT_STALL) ? " stall" : "",
+ (temp & EPSTAT_BCOUNT) >> 16);
+
+ temp = __raw_readl(imx_ep->imx_usb->base + USB_EP_FSTAT(EP_NO(imx_ep)));
+
+ dev_dbg(imx_ep->imx_usb->dev,
+ "<%s> EP%d_FSTAT=[%s%s%s%s%s%s%s]\n", label, EP_NO(imx_ep),
+ (temp & FSTAT_ERR) ? " ferr" : "",
+ (temp & FSTAT_UF) ? " funder" : "",
+ (temp & FSTAT_OF) ? " fover" : "",
+ (temp & FSTAT_FR) ? " fready" : "",
+ (temp & FSTAT_FULL) ? " ffull" : "",
+ (temp & FSTAT_ALRM) ? " falarm" : "",
+ (temp & FSTAT_EMPTY) ? " fempty" : "");
+ }
+
+ static void dump_req(const char *label, struct imx_ep_struct *imx_ep, struct usb_request *req)
+ {
+ int i;
+
+ if (!req || !req->buf) {
+ dev_dbg(imx_ep->imx_usb->dev, "<%s> req or req buf is free\n", label);
+ return;
+ }
+
+ if ((!EP_NO(imx_ep) && imx_ep->imx_usb->ep0state == EP0_IN_DATA_PHASE)
+ || (EP_NO(imx_ep) && EP_DIR(imx_ep))) {
+
+ dev_dbg(imx_ep->imx_usb->dev, "<%s> request dump <", label);
+ for (i = 0; i < req->length; i++)
+ printk("%02x-", *((u8 *)req->buf + i));
+ printk(">\n");
+ }
+ }
+
+#else
+ #define dump_ep_stat(x, y) do {} while (0)
+ #define dump_usb_stat(x, y) do {} while (0)
+ #define dump_req(x, y, z) do {} while (0)
+#endif /* DEBUG_DUMP */
+
+#ifdef DEBUG_ERR
+ #define D_ERR(dev, args...) dev_dbg(dev, ## args)
+#else
+ #define D_ERR(dev, args...) do {} while (0)
+#endif
+
+#else
+ #define D_REQ(dev, args...) do {} while (0)
+ #define D_TRX(dev, args...) do {} while (0)
+ #define D_INI(dev, args...) do {} while (0)
+ #define D_EP0(dev, args...) do {} while (0)
+ #define D_EPX(dev, args...) do {} while (0)
+ #define dump_ep_intr(x, y, z, i) do {} while (0)
+ #define dump_intr(x, y, z) do {} while (0)
+ #define dump_ep_stat(x, y) do {} while (0)
+ #define dump_usb_stat(x, y) do {} while (0)
+ #define dump_req(x, y, z) do {} while (0)
+ #define D_ERR(dev, args...) do {} while (0)
+#endif /* DEBUG */
+
+#endif /* __LINUX_USB_GADGET_IMX_H */
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff