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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/mtu3/mtu3_gadget_ep0.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/mtu3/mtu3_gadget_ep0.c')
-rw-r--r--drivers/usb/mtu3/mtu3_gadget_ep0.c916
1 files changed, 916 insertions, 0 deletions
diff --git a/drivers/usb/mtu3/mtu3_gadget_ep0.c b/drivers/usb/mtu3/mtu3_gadget_ep0.c
new file mode 100644
index 000000000..e4fd1bb14
--- /dev/null
+++ b/drivers/usb/mtu3/mtu3_gadget_ep0.c
@@ -0,0 +1,916 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mtu3_gadget_ep0.c - MediaTek USB3 DRD peripheral driver ep0 handling
+ *
+ * Copyright (c) 2016 MediaTek Inc.
+ *
+ * Author: Chunfeng.Yun <chunfeng.yun@mediatek.com>
+ */
+
+#include <linux/iopoll.h>
+#include <linux/usb/composite.h>
+
+#include "mtu3.h"
+#include "mtu3_debug.h"
+#include "mtu3_trace.h"
+
+/* ep0 is always mtu3->in_eps[0] */
+#define next_ep0_request(mtu) next_request((mtu)->ep0)
+
+/* for high speed test mode; see USB 2.0 spec 7.1.20 */
+static const u8 mtu3_test_packet[53] = {
+ /* implicit SYNC then DATA0 to start */
+
+ /* JKJKJKJK x9 */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* JJKKJJKK x8 */
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ /* JJJJKKKK x8 */
+ 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
+ /* JJJJJJJKKKKKKK x8 */
+ 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ /* JJJJJJJK x8 */
+ 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
+ /* JKKKKKKK x10, JK */
+ 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e,
+ /* implicit CRC16 then EOP to end */
+};
+
+static char *decode_ep0_state(struct mtu3 *mtu)
+{
+ switch (mtu->ep0_state) {
+ case MU3D_EP0_STATE_SETUP:
+ return "SETUP";
+ case MU3D_EP0_STATE_TX:
+ return "IN";
+ case MU3D_EP0_STATE_RX:
+ return "OUT";
+ case MU3D_EP0_STATE_TX_END:
+ return "TX-END";
+ case MU3D_EP0_STATE_STALL:
+ return "STALL";
+ default:
+ return "??";
+ }
+}
+
+static void ep0_req_giveback(struct mtu3 *mtu, struct usb_request *req)
+{
+ mtu3_req_complete(mtu->ep0, req, 0);
+}
+
+static int
+forward_to_driver(struct mtu3 *mtu, const struct usb_ctrlrequest *setup)
+__releases(mtu->lock)
+__acquires(mtu->lock)
+{
+ int ret;
+
+ if (!mtu->gadget_driver || !mtu->async_callbacks)
+ return -EOPNOTSUPP;
+
+ spin_unlock(&mtu->lock);
+ ret = mtu->gadget_driver->setup(&mtu->g, setup);
+ spin_lock(&mtu->lock);
+
+ dev_dbg(mtu->dev, "%s ret %d\n", __func__, ret);
+ return ret;
+}
+
+static void ep0_write_fifo(struct mtu3_ep *mep, const u8 *src, u16 len)
+{
+ void __iomem *fifo = mep->mtu->mac_base + U3D_FIFO0;
+ u16 index = 0;
+
+ dev_dbg(mep->mtu->dev, "%s: ep%din, len=%d, buf=%p\n",
+ __func__, mep->epnum, len, src);
+
+ if (len >= 4) {
+ iowrite32_rep(fifo, src, len >> 2);
+ index = len & ~0x03;
+ }
+ if (len & 0x02) {
+ writew(*(u16 *)&src[index], fifo);
+ index += 2;
+ }
+ if (len & 0x01)
+ writeb(src[index], fifo);
+}
+
+static void ep0_read_fifo(struct mtu3_ep *mep, u8 *dst, u16 len)
+{
+ void __iomem *fifo = mep->mtu->mac_base + U3D_FIFO0;
+ u32 value;
+ u16 index = 0;
+
+ dev_dbg(mep->mtu->dev, "%s: ep%dout len=%d buf=%p\n",
+ __func__, mep->epnum, len, dst);
+
+ if (len >= 4) {
+ ioread32_rep(fifo, dst, len >> 2);
+ index = len & ~0x03;
+ }
+ if (len & 0x3) {
+ value = readl(fifo);
+ memcpy(&dst[index], &value, len & 0x3);
+ }
+
+}
+
+static void ep0_load_test_packet(struct mtu3 *mtu)
+{
+ /*
+ * because the length of test packet is less than max packet of HS ep0,
+ * write it into fifo directly.
+ */
+ ep0_write_fifo(mtu->ep0, mtu3_test_packet, sizeof(mtu3_test_packet));
+}
+
+/*
+ * A. send STALL for setup transfer without data stage:
+ * set SENDSTALL and SETUPPKTRDY at the same time;
+ * B. send STALL for other cases:
+ * set SENDSTALL only.
+ */
+static void ep0_stall_set(struct mtu3_ep *mep0, bool set, u32 pktrdy)
+{
+ struct mtu3 *mtu = mep0->mtu;
+ void __iomem *mbase = mtu->mac_base;
+ u32 csr;
+
+ /* EP0_SENTSTALL is W1C */
+ csr = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
+ if (set)
+ csr |= EP0_SENDSTALL | pktrdy;
+ else
+ csr = (csr & ~EP0_SENDSTALL) | EP0_SENTSTALL;
+ mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr);
+
+ mtu->delayed_status = false;
+ mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+
+ dev_dbg(mtu->dev, "ep0: %s STALL, ep0_state: %s\n",
+ set ? "SEND" : "CLEAR", decode_ep0_state(mtu));
+}
+
+static void ep0_do_status_stage(struct mtu3 *mtu)
+{
+ void __iomem *mbase = mtu->mac_base;
+ u32 value;
+
+ value = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
+ mtu3_writel(mbase, U3D_EP0CSR, value | EP0_SETUPPKTRDY | EP0_DATAEND);
+}
+
+static int ep0_queue(struct mtu3_ep *mep0, struct mtu3_request *mreq);
+
+static void ep0_dummy_complete(struct usb_ep *ep, struct usb_request *req)
+{}
+
+static void ep0_set_sel_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtu3_request *mreq;
+ struct mtu3 *mtu;
+ struct usb_set_sel_req sel;
+
+ memcpy(&sel, req->buf, sizeof(sel));
+
+ mreq = to_mtu3_request(req);
+ mtu = mreq->mtu;
+ dev_dbg(mtu->dev, "u1sel:%d, u1pel:%d, u2sel:%d, u2pel:%d\n",
+ sel.u1_sel, sel.u1_pel, sel.u2_sel, sel.u2_pel);
+}
+
+/* queue data stage to handle 6 byte SET_SEL request */
+static int ep0_set_sel(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
+{
+ int ret;
+ u16 length = le16_to_cpu(setup->wLength);
+
+ if (unlikely(length != 6)) {
+ dev_err(mtu->dev, "%s wrong wLength:%d\n",
+ __func__, length);
+ return -EINVAL;
+ }
+
+ mtu->ep0_req.mep = mtu->ep0;
+ mtu->ep0_req.request.length = 6;
+ mtu->ep0_req.request.buf = mtu->setup_buf;
+ mtu->ep0_req.request.complete = ep0_set_sel_complete;
+ ret = ep0_queue(mtu->ep0, &mtu->ep0_req);
+
+ return ret < 0 ? ret : 1;
+}
+
+static int
+ep0_get_status(struct mtu3 *mtu, const struct usb_ctrlrequest *setup)
+{
+ struct mtu3_ep *mep = NULL;
+ int handled = 1;
+ u8 result[2] = {0, 0};
+ u8 epnum = 0;
+ int is_in;
+
+ switch (setup->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ result[0] = mtu->is_self_powered << USB_DEVICE_SELF_POWERED;
+ result[0] |= mtu->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+
+ if (mtu->g.speed >= USB_SPEED_SUPER) {
+ result[0] |= mtu->u1_enable << USB_DEV_STAT_U1_ENABLED;
+ result[0] |= mtu->u2_enable << USB_DEV_STAT_U2_ENABLED;
+ }
+
+ dev_dbg(mtu->dev, "%s result=%x, U1=%x, U2=%x\n", __func__,
+ result[0], mtu->u1_enable, mtu->u2_enable);
+
+ break;
+ case USB_RECIP_INTERFACE:
+ /* status of function remote wakeup, forward request */
+ handled = 0;
+ break;
+ case USB_RECIP_ENDPOINT:
+ epnum = (u8) le16_to_cpu(setup->wIndex);
+ is_in = epnum & USB_DIR_IN;
+ epnum &= USB_ENDPOINT_NUMBER_MASK;
+
+ if (epnum >= mtu->num_eps) {
+ handled = -EINVAL;
+ break;
+ }
+ if (!epnum)
+ break;
+
+ mep = (is_in ? mtu->in_eps : mtu->out_eps) + epnum;
+ if (!mep->desc) {
+ handled = -EINVAL;
+ break;
+ }
+ if (mep->flags & MTU3_EP_STALL)
+ result[0] |= 1 << USB_ENDPOINT_HALT;
+
+ break;
+ default:
+ /* class, vendor, etc ... delegate */
+ handled = 0;
+ break;
+ }
+
+ if (handled > 0) {
+ int ret;
+
+ /* prepare a data stage for GET_STATUS */
+ dev_dbg(mtu->dev, "get_status=%x\n", *(u16 *)result);
+ memcpy(mtu->setup_buf, result, sizeof(result));
+ mtu->ep0_req.mep = mtu->ep0;
+ mtu->ep0_req.request.length = 2;
+ mtu->ep0_req.request.buf = &mtu->setup_buf;
+ mtu->ep0_req.request.complete = ep0_dummy_complete;
+ ret = ep0_queue(mtu->ep0, &mtu->ep0_req);
+ if (ret < 0)
+ handled = ret;
+ }
+ return handled;
+}
+
+static int handle_test_mode(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
+{
+ void __iomem *mbase = mtu->mac_base;
+ int handled = 1;
+ u32 value;
+
+ switch (le16_to_cpu(setup->wIndex) >> 8) {
+ case USB_TEST_J:
+ dev_dbg(mtu->dev, "USB_TEST_J\n");
+ mtu->test_mode_nr = TEST_J_MODE;
+ break;
+ case USB_TEST_K:
+ dev_dbg(mtu->dev, "USB_TEST_K\n");
+ mtu->test_mode_nr = TEST_K_MODE;
+ break;
+ case USB_TEST_SE0_NAK:
+ dev_dbg(mtu->dev, "USB_TEST_SE0_NAK\n");
+ mtu->test_mode_nr = TEST_SE0_NAK_MODE;
+ break;
+ case USB_TEST_PACKET:
+ dev_dbg(mtu->dev, "USB_TEST_PACKET\n");
+ mtu->test_mode_nr = TEST_PACKET_MODE;
+ break;
+ default:
+ handled = -EINVAL;
+ goto out;
+ }
+
+ mtu->test_mode = true;
+
+ /* no TX completion interrupt, and need restart platform after test */
+ if (mtu->test_mode_nr == TEST_PACKET_MODE)
+ ep0_load_test_packet(mtu);
+
+ /* send status before entering test mode. */
+ ep0_do_status_stage(mtu);
+
+ /* wait for ACK status sent by host */
+ readl_poll_timeout_atomic(mbase + U3D_EP0CSR, value,
+ !(value & EP0_DATAEND), 100, 5000);
+
+ mtu3_writel(mbase, U3D_USB2_TEST_MODE, mtu->test_mode_nr);
+
+ mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+
+out:
+ return handled;
+}
+
+static int ep0_handle_feature_dev(struct mtu3 *mtu,
+ struct usb_ctrlrequest *setup, bool set)
+{
+ void __iomem *mbase = mtu->mac_base;
+ int handled = -EINVAL;
+ u32 lpc;
+
+ switch (le16_to_cpu(setup->wValue)) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ mtu->may_wakeup = !!set;
+ handled = 1;
+ break;
+ case USB_DEVICE_TEST_MODE:
+ if (!set || (mtu->g.speed != USB_SPEED_HIGH) ||
+ (le16_to_cpu(setup->wIndex) & 0xff))
+ break;
+
+ handled = handle_test_mode(mtu, setup);
+ break;
+ case USB_DEVICE_U1_ENABLE:
+ if (mtu->g.speed < USB_SPEED_SUPER ||
+ mtu->g.state != USB_STATE_CONFIGURED)
+ break;
+
+ lpc = mtu3_readl(mbase, U3D_LINK_POWER_CONTROL);
+ if (set)
+ lpc |= SW_U1_REQUEST_ENABLE;
+ else
+ lpc &= ~SW_U1_REQUEST_ENABLE;
+ mtu3_writel(mbase, U3D_LINK_POWER_CONTROL, lpc);
+
+ mtu->u1_enable = !!set;
+ handled = 1;
+ break;
+ case USB_DEVICE_U2_ENABLE:
+ if (mtu->g.speed < USB_SPEED_SUPER ||
+ mtu->g.state != USB_STATE_CONFIGURED)
+ break;
+
+ lpc = mtu3_readl(mbase, U3D_LINK_POWER_CONTROL);
+ if (set)
+ lpc |= SW_U2_REQUEST_ENABLE;
+ else
+ lpc &= ~SW_U2_REQUEST_ENABLE;
+ mtu3_writel(mbase, U3D_LINK_POWER_CONTROL, lpc);
+
+ mtu->u2_enable = !!set;
+ handled = 1;
+ break;
+ default:
+ handled = -EINVAL;
+ break;
+ }
+ return handled;
+}
+
+static int ep0_handle_feature(struct mtu3 *mtu,
+ struct usb_ctrlrequest *setup, bool set)
+{
+ struct mtu3_ep *mep;
+ int handled = -EINVAL;
+ int is_in;
+ u16 value;
+ u16 index;
+ u8 epnum;
+
+ value = le16_to_cpu(setup->wValue);
+ index = le16_to_cpu(setup->wIndex);
+
+ switch (setup->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ handled = ep0_handle_feature_dev(mtu, setup, set);
+ break;
+ case USB_RECIP_INTERFACE:
+ /* superspeed only */
+ if (value == USB_INTRF_FUNC_SUSPEND &&
+ mtu->g.speed >= USB_SPEED_SUPER) {
+ /* forward the request for function suspend */
+ mtu->may_wakeup = !!(index & USB_INTRF_FUNC_SUSPEND_RW);
+ handled = 0;
+ }
+ break;
+ case USB_RECIP_ENDPOINT:
+ epnum = index & USB_ENDPOINT_NUMBER_MASK;
+ if (epnum == 0 || epnum >= mtu->num_eps ||
+ value != USB_ENDPOINT_HALT)
+ break;
+
+ is_in = index & USB_DIR_IN;
+ mep = (is_in ? mtu->in_eps : mtu->out_eps) + epnum;
+ if (!mep->desc)
+ break;
+
+ handled = 1;
+ /* ignore request if endpoint is wedged */
+ if (mep->flags & MTU3_EP_WEDGE)
+ break;
+
+ mtu3_ep_stall_set(mep, set);
+ break;
+ default:
+ /* class, vendor, etc ... delegate */
+ handled = 0;
+ break;
+ }
+ return handled;
+}
+
+/*
+ * handle all control requests can be handled
+ * returns:
+ * negative errno - error happened
+ * zero - need delegate SETUP to gadget driver
+ * positive - already handled
+ */
+static int handle_standard_request(struct mtu3 *mtu,
+ struct usb_ctrlrequest *setup)
+{
+ void __iomem *mbase = mtu->mac_base;
+ enum usb_device_state state = mtu->g.state;
+ int handled = -EINVAL;
+ u32 dev_conf;
+ u16 value;
+
+ value = le16_to_cpu(setup->wValue);
+
+ /* the gadget driver handles everything except what we must handle */
+ switch (setup->bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ /* change it after the status stage */
+ mtu->address = (u8) (value & 0x7f);
+ dev_dbg(mtu->dev, "set address to 0x%x\n", mtu->address);
+
+ dev_conf = mtu3_readl(mbase, U3D_DEVICE_CONF);
+ dev_conf &= ~DEV_ADDR_MSK;
+ dev_conf |= DEV_ADDR(mtu->address);
+ mtu3_writel(mbase, U3D_DEVICE_CONF, dev_conf);
+
+ if (mtu->address)
+ usb_gadget_set_state(&mtu->g, USB_STATE_ADDRESS);
+ else
+ usb_gadget_set_state(&mtu->g, USB_STATE_DEFAULT);
+
+ handled = 1;
+ break;
+ case USB_REQ_SET_CONFIGURATION:
+ if (state == USB_STATE_ADDRESS) {
+ usb_gadget_set_state(&mtu->g,
+ USB_STATE_CONFIGURED);
+ } else if (state == USB_STATE_CONFIGURED) {
+ /*
+ * USB2 spec sec 9.4.7, if wValue is 0 then dev
+ * is moved to addressed state
+ */
+ if (!value)
+ usb_gadget_set_state(&mtu->g,
+ USB_STATE_ADDRESS);
+ }
+ handled = 0;
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ handled = ep0_handle_feature(mtu, setup, 0);
+ break;
+ case USB_REQ_SET_FEATURE:
+ handled = ep0_handle_feature(mtu, setup, 1);
+ break;
+ case USB_REQ_GET_STATUS:
+ handled = ep0_get_status(mtu, setup);
+ break;
+ case USB_REQ_SET_SEL:
+ handled = ep0_set_sel(mtu, setup);
+ break;
+ case USB_REQ_SET_ISOCH_DELAY:
+ handled = 1;
+ break;
+ default:
+ /* delegate SET_CONFIGURATION, etc */
+ handled = 0;
+ }
+
+ return handled;
+}
+
+/* receive an data packet (OUT) */
+static void ep0_rx_state(struct mtu3 *mtu)
+{
+ struct mtu3_request *mreq;
+ struct usb_request *req;
+ void __iomem *mbase = mtu->mac_base;
+ u32 maxp;
+ u32 csr;
+ u16 count = 0;
+
+ dev_dbg(mtu->dev, "%s\n", __func__);
+
+ csr = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
+ mreq = next_ep0_request(mtu);
+ req = &mreq->request;
+
+ /* read packet and ack; or stall because of gadget driver bug */
+ if (req) {
+ void *buf = req->buf + req->actual;
+ unsigned int len = req->length - req->actual;
+
+ /* read the buffer */
+ count = mtu3_readl(mbase, U3D_RXCOUNT0);
+ if (count > len) {
+ req->status = -EOVERFLOW;
+ count = len;
+ }
+ ep0_read_fifo(mtu->ep0, buf, count);
+ req->actual += count;
+ csr |= EP0_RXPKTRDY;
+
+ maxp = mtu->g.ep0->maxpacket;
+ if (count < maxp || req->actual == req->length) {
+ mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+ dev_dbg(mtu->dev, "ep0 state: %s\n",
+ decode_ep0_state(mtu));
+
+ csr |= EP0_DATAEND;
+ } else {
+ req = NULL;
+ }
+ } else {
+ csr |= EP0_RXPKTRDY | EP0_SENDSTALL;
+ dev_dbg(mtu->dev, "%s: SENDSTALL\n", __func__);
+ }
+
+ mtu3_writel(mbase, U3D_EP0CSR, csr);
+
+ /* give back the request if have received all data */
+ if (req)
+ ep0_req_giveback(mtu, req);
+
+}
+
+/* transmitting to the host (IN) */
+static void ep0_tx_state(struct mtu3 *mtu)
+{
+ struct mtu3_request *mreq = next_ep0_request(mtu);
+ struct usb_request *req;
+ u32 csr;
+ u8 *src;
+ u32 count;
+ u32 maxp;
+
+ dev_dbg(mtu->dev, "%s\n", __func__);
+
+ if (!mreq)
+ return;
+
+ maxp = mtu->g.ep0->maxpacket;
+ req = &mreq->request;
+
+ /* load the data */
+ src = (u8 *)req->buf + req->actual;
+ count = min(maxp, req->length - req->actual);
+ if (count)
+ ep0_write_fifo(mtu->ep0, src, count);
+
+ dev_dbg(mtu->dev, "%s act=%d, len=%d, cnt=%d, maxp=%d zero=%d\n",
+ __func__, req->actual, req->length, count, maxp, req->zero);
+
+ req->actual += count;
+
+ if ((count < maxp)
+ || ((req->actual == req->length) && !req->zero))
+ mtu->ep0_state = MU3D_EP0_STATE_TX_END;
+
+ /* send it out, triggering a "txpktrdy cleared" irq */
+ csr = mtu3_readl(mtu->mac_base, U3D_EP0CSR) & EP0_W1C_BITS;
+ mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr | EP0_TXPKTRDY);
+
+ dev_dbg(mtu->dev, "%s ep0csr=0x%x\n", __func__,
+ mtu3_readl(mtu->mac_base, U3D_EP0CSR));
+}
+
+static void ep0_read_setup(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
+{
+ struct mtu3_request *mreq;
+ u32 count;
+ u32 csr;
+
+ csr = mtu3_readl(mtu->mac_base, U3D_EP0CSR) & EP0_W1C_BITS;
+ count = mtu3_readl(mtu->mac_base, U3D_RXCOUNT0);
+
+ ep0_read_fifo(mtu->ep0, (u8 *)setup, count);
+
+ dev_dbg(mtu->dev, "SETUP req%02x.%02x v%04x i%04x l%04x\n",
+ setup->bRequestType, setup->bRequest,
+ le16_to_cpu(setup->wValue), le16_to_cpu(setup->wIndex),
+ le16_to_cpu(setup->wLength));
+
+ /* clean up any leftover transfers */
+ mreq = next_ep0_request(mtu);
+ if (mreq)
+ ep0_req_giveback(mtu, &mreq->request);
+
+ if (le16_to_cpu(setup->wLength) == 0) {
+ ; /* no data stage, nothing to do */
+ } else if (setup->bRequestType & USB_DIR_IN) {
+ mtu3_writel(mtu->mac_base, U3D_EP0CSR,
+ csr | EP0_SETUPPKTRDY | EP0_DPHTX);
+ mtu->ep0_state = MU3D_EP0_STATE_TX;
+ } else {
+ mtu3_writel(mtu->mac_base, U3D_EP0CSR,
+ (csr | EP0_SETUPPKTRDY) & (~EP0_DPHTX));
+ mtu->ep0_state = MU3D_EP0_STATE_RX;
+ }
+}
+
+static int ep0_handle_setup(struct mtu3 *mtu)
+__releases(mtu->lock)
+__acquires(mtu->lock)
+{
+ struct usb_ctrlrequest setup;
+ struct mtu3_request *mreq;
+ int handled = 0;
+
+ ep0_read_setup(mtu, &setup);
+ trace_mtu3_handle_setup(&setup);
+
+ if ((setup.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+ handled = handle_standard_request(mtu, &setup);
+
+ dev_dbg(mtu->dev, "handled %d, ep0_state: %s\n",
+ handled, decode_ep0_state(mtu));
+
+ if (handled < 0)
+ goto stall;
+ else if (handled > 0)
+ goto finish;
+
+ handled = forward_to_driver(mtu, &setup);
+ if (handled < 0) {
+stall:
+ dev_dbg(mtu->dev, "%s stall (%d)\n", __func__, handled);
+
+ ep0_stall_set(mtu->ep0, true,
+ le16_to_cpu(setup.wLength) ? 0 : EP0_SETUPPKTRDY);
+
+ return 0;
+ }
+
+finish:
+ if (mtu->test_mode) {
+ ; /* nothing to do */
+ } else if (handled == USB_GADGET_DELAYED_STATUS) {
+
+ mreq = next_ep0_request(mtu);
+ if (mreq) {
+ /* already asked us to continue delayed status */
+ ep0_do_status_stage(mtu);
+ ep0_req_giveback(mtu, &mreq->request);
+ } else {
+ /* do delayed STATUS stage till receive ep0_queue */
+ mtu->delayed_status = true;
+ }
+ } else if (le16_to_cpu(setup.wLength) == 0) { /* no data stage */
+
+ ep0_do_status_stage(mtu);
+ /* complete zlp request directly */
+ mreq = next_ep0_request(mtu);
+ if (mreq && !mreq->request.length)
+ ep0_req_giveback(mtu, &mreq->request);
+ }
+
+ return 0;
+}
+
+irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu)
+{
+ void __iomem *mbase = mtu->mac_base;
+ struct mtu3_request *mreq;
+ u32 int_status;
+ irqreturn_t ret = IRQ_NONE;
+ u32 csr;
+ u32 len;
+
+ int_status = mtu3_readl(mbase, U3D_EPISR);
+ int_status &= mtu3_readl(mbase, U3D_EPIER);
+ mtu3_writel(mbase, U3D_EPISR, int_status); /* W1C */
+
+ /* only handle ep0's */
+ if (!(int_status & (EP0ISR | SETUPENDISR)))
+ return IRQ_NONE;
+
+ /* abort current SETUP, and process new one */
+ if (int_status & SETUPENDISR)
+ mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+
+ csr = mtu3_readl(mbase, U3D_EP0CSR);
+
+ dev_dbg(mtu->dev, "%s csr=0x%x\n", __func__, csr);
+
+ /* we sent a stall.. need to clear it now.. */
+ if (csr & EP0_SENTSTALL) {
+ ep0_stall_set(mtu->ep0, false, 0);
+ csr = mtu3_readl(mbase, U3D_EP0CSR);
+ ret = IRQ_HANDLED;
+ }
+ dev_dbg(mtu->dev, "ep0_state: %s\n", decode_ep0_state(mtu));
+ mtu3_dbg_trace(mtu->dev, "ep0_state %s", decode_ep0_state(mtu));
+
+ switch (mtu->ep0_state) {
+ case MU3D_EP0_STATE_TX:
+ /* irq on clearing txpktrdy */
+ if ((csr & EP0_FIFOFULL) == 0) {
+ ep0_tx_state(mtu);
+ ret = IRQ_HANDLED;
+ }
+ break;
+ case MU3D_EP0_STATE_RX:
+ /* irq on set rxpktrdy */
+ if (csr & EP0_RXPKTRDY) {
+ ep0_rx_state(mtu);
+ ret = IRQ_HANDLED;
+ }
+ break;
+ case MU3D_EP0_STATE_TX_END:
+ mtu3_writel(mbase, U3D_EP0CSR,
+ (csr & EP0_W1C_BITS) | EP0_DATAEND);
+
+ mreq = next_ep0_request(mtu);
+ if (mreq)
+ ep0_req_giveback(mtu, &mreq->request);
+
+ mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+ ret = IRQ_HANDLED;
+ dev_dbg(mtu->dev, "ep0_state: %s\n", decode_ep0_state(mtu));
+ break;
+ case MU3D_EP0_STATE_SETUP:
+ if (!(csr & EP0_SETUPPKTRDY))
+ break;
+
+ len = mtu3_readl(mbase, U3D_RXCOUNT0);
+ if (len != 8) {
+ dev_err(mtu->dev, "SETUP packet len %d != 8 ?\n", len);
+ break;
+ }
+
+ ep0_handle_setup(mtu);
+ ret = IRQ_HANDLED;
+ break;
+ default:
+ /* can't happen */
+ ep0_stall_set(mtu->ep0, true, 0);
+ WARN_ON(1);
+ break;
+ }
+
+ return ret;
+}
+
+
+static int mtu3_ep0_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ /* always enabled */
+ return -EINVAL;
+}
+
+static int mtu3_ep0_disable(struct usb_ep *ep)
+{
+ /* always enabled */
+ return -EINVAL;
+}
+
+static int ep0_queue(struct mtu3_ep *mep, struct mtu3_request *mreq)
+{
+ struct mtu3 *mtu = mep->mtu;
+
+ mreq->mtu = mtu;
+ mreq->request.actual = 0;
+ mreq->request.status = -EINPROGRESS;
+
+ dev_dbg(mtu->dev, "%s %s (ep0_state: %s), len#%d\n", __func__,
+ mep->name, decode_ep0_state(mtu), mreq->request.length);
+
+ switch (mtu->ep0_state) {
+ case MU3D_EP0_STATE_SETUP:
+ case MU3D_EP0_STATE_RX: /* control-OUT data */
+ case MU3D_EP0_STATE_TX: /* control-IN data */
+ break;
+ default:
+ dev_err(mtu->dev, "%s, error in ep0 state %s\n", __func__,
+ decode_ep0_state(mtu));
+ return -EINVAL;
+ }
+
+ if (mtu->delayed_status) {
+
+ mtu->delayed_status = false;
+ ep0_do_status_stage(mtu);
+ /* needn't giveback the request for handling delay STATUS */
+ return 0;
+ }
+
+ if (!list_empty(&mep->req_list))
+ return -EBUSY;
+
+ list_add_tail(&mreq->list, &mep->req_list);
+
+ /* sequence #1, IN ... start writing the data */
+ if (mtu->ep0_state == MU3D_EP0_STATE_TX)
+ ep0_tx_state(mtu);
+
+ return 0;
+}
+
+static int mtu3_ep0_queue(struct usb_ep *ep,
+ struct usb_request *req, gfp_t gfp)
+{
+ struct mtu3_ep *mep;
+ struct mtu3_request *mreq;
+ struct mtu3 *mtu;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!ep || !req)
+ return -EINVAL;
+
+ mep = to_mtu3_ep(ep);
+ mtu = mep->mtu;
+ mreq = to_mtu3_request(req);
+
+ spin_lock_irqsave(&mtu->lock, flags);
+ ret = ep0_queue(mep, mreq);
+ spin_unlock_irqrestore(&mtu->lock, flags);
+ return ret;
+}
+
+static int mtu3_ep0_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+ /* we just won't support this */
+ return -EINVAL;
+}
+
+static int mtu3_ep0_halt(struct usb_ep *ep, int value)
+{
+ struct mtu3_ep *mep;
+ struct mtu3 *mtu;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!ep || !value)
+ return -EINVAL;
+
+ mep = to_mtu3_ep(ep);
+ mtu = mep->mtu;
+
+ dev_dbg(mtu->dev, "%s\n", __func__);
+
+ spin_lock_irqsave(&mtu->lock, flags);
+
+ if (!list_empty(&mep->req_list)) {
+ ret = -EBUSY;
+ goto cleanup;
+ }
+
+ switch (mtu->ep0_state) {
+ /*
+ * stalls are usually issued after parsing SETUP packet, either
+ * directly in irq context from setup() or else later.
+ */
+ case MU3D_EP0_STATE_TX:
+ case MU3D_EP0_STATE_TX_END:
+ case MU3D_EP0_STATE_RX:
+ case MU3D_EP0_STATE_SETUP:
+ ep0_stall_set(mtu->ep0, true, 0);
+ break;
+ default:
+ dev_dbg(mtu->dev, "ep0 can't halt in state %s\n",
+ decode_ep0_state(mtu));
+ ret = -EINVAL;
+ }
+
+cleanup:
+ spin_unlock_irqrestore(&mtu->lock, flags);
+ return ret;
+}
+
+const struct usb_ep_ops mtu3_ep0_ops = {
+ .enable = mtu3_ep0_enable,
+ .disable = mtu3_ep0_disable,
+ .alloc_request = mtu3_alloc_request,
+ .free_request = mtu3_free_request,
+ .queue = mtu3_ep0_queue,
+ .dequeue = mtu3_ep0_dequeue,
+ .set_halt = mtu3_ep0_halt,
+};