[PATCH v13 08/10] USB ppc4xx: Add Synopsys DWC OTG PCD interrupt function
tmarri at apm.com
tmarri at apm.com
Mon Apr 4 09:17:13 EST 2011
From: Tirumala Marri <tmarri at apm.com>
Implements the DWC OTG PCD Interrupt Service routine.
Signed-off-by: Tirumala R Marri <tmarri at apm.com>
Signed-off-by: Fushen Chen <fchen at apm.com>
Signed-off-by: Mark Miesfeld <mmiesfeld at apm.com>
---
drivers/usb/dwc/pcd_intr.c | 2311 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 2311 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/dwc/pcd_intr.c
diff --git a/drivers/usb/dwc/pcd_intr.c b/drivers/usb/dwc/pcd_intr.c
new file mode 100644
index 0000000..bc1a9b3
--- /dev/null
+++ b/drivers/usb/dwc/pcd_intr.c
@@ -0,0 +1,2311 @@
+/*
+ * DesignWare HS OTG controller driver
+ * Copyright (C) 2006 Synopsys, Inc.
+ * Portions Copyright (C) 2010 Applied Micro Circuits Corporation.
+ *
+ * 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.
+ *
+ * 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 version 2 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see http://www.gnu.org/licenses
+ * or write to the Free Software Foundation, Inc., 51 Franklin Street,
+ * Suite 500, Boston, MA 02110-1335 USA.
+ *
+ * Based on Synopsys driver version 2.60a
+ * Modified by Mark Miesfeld <mmiesfeld at apm.com>
+ * Modified by Stefan Roese <sr at denx.de>, DENX Software Engineering
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL SYNOPSYS, INC. BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "driver.h"
+#include "pcd.h"
+
+/**
+ * This function returns pointer to in ep struct with number num
+ */
+static struct pcd_ep *get_in_ep(struct dwc_pcd *pcd, u32 num)
+{
+ if (num == 0) {
+ return &pcd->ep0;
+ } else {
+ u32 i;
+ int num_in_eps = GET_CORE_IF(pcd)->dev_if->num_in_eps;
+
+ for (i = 0; i < num_in_eps; ++i) {
+ if (pcd->in_ep[i].dwc_ep.num == num)
+ return &pcd->in_ep[i];
+ }
+ }
+ return NULL;
+}
+
+/**
+ * This function returns pointer to out ep struct with number num
+ */
+static struct pcd_ep *get_out_ep(struct dwc_pcd *pcd, u32 num)
+{
+ if (num == 0) {
+ return &pcd->ep0;
+ } else {
+ u32 i;
+ int num_out_eps = GET_CORE_IF(pcd)->dev_if->num_out_eps;
+
+ for (i = 0; i < num_out_eps; ++i) {
+ if (pcd->out_ep[i].dwc_ep.num == num)
+ return &pcd->out_ep[i];
+ }
+ }
+ return NULL;
+}
+
+/**
+ * This functions gets a pointer to an EP from the wIndex address
+ * value of the control request.
+ */
+static struct pcd_ep *get_ep_by_addr(struct dwc_pcd *pcd, u16 index)
+{
+ struct pcd_ep *ep;
+
+ if (!(index & USB_ENDPOINT_NUMBER_MASK))
+ return &pcd->ep0;
+
+ list_for_each_entry(ep, &pcd->gadget.ep_list, ep.ep_list) {
+ u8 bEndpointAddress;
+
+ if (!ep->desc)
+ continue;
+
+ bEndpointAddress = ep->desc->bEndpointAddress;
+ if ((index ^ bEndpointAddress) & USB_DIR_IN)
+ continue;
+
+ if ((index & 0x0f) == (bEndpointAddress & 0x0f))
+ return ep;
+ }
+ return NULL;
+}
+
+/**
+ * This function checks the EP request queue, if the queue is not
+ * empty the next request is started.
+ */
+void start_next_request(struct pcd_ep *ep)
+{
+ if (!list_empty(&ep->queue)) {
+ struct pcd_request *req;
+
+ req = list_entry(ep->queue.next, struct pcd_request, queue);
+
+ /* Setup and start the Transfer */
+ ep->dwc_ep.start_xfer_buff = req->req.buf;
+ ep->dwc_ep.xfer_buff = req->req.buf;
+ ep->dwc_ep.xfer_len = req->req.length;
+ ep->dwc_ep.xfer_count = 0;
+ ep->dwc_ep.dma_addr = req->req.dma;
+ ep->dwc_ep.sent_zlp = 0;
+ ep->dwc_ep.total_len = ep->dwc_ep.xfer_len;
+
+ /*
+ * Added-sr: 2007-07-26
+ *
+ * When a new transfer will be started, mark this
+ * endpoint as active. This way it will be blocked
+ * for further transfers, until the current transfer
+ * is finished.
+ */
+ if (dwc_has_feature(GET_CORE_IF(ep->pcd), DWC_LIMITED_XFER))
+ ep->dwc_ep.active = 1;
+
+ dwc_otg_ep_start_transfer(GET_CORE_IF(ep->pcd), &ep->dwc_ep);
+ }
+}
+
+/**
+ * This function handles the SOF Interrupts. At this time the SOF
+ * Interrupt is disabled.
+ */
+static int dwc_otg_pcd_handle_sof_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ u32 gintsts;
+
+ /* Clear interrupt */
+ gintsts = 0;
+ gintsts |= DWC_INTMSK_STRT_OF_FRM;
+ dwc_write32((core_if->core_global_regs) + DWC_GINTSTS, gintsts);
+ return 1;
+}
+
+/**
+ * This function reads the 8 bytes of the setup packet from the Rx FIFO into the
+ * destination buffer. It is called from the Rx Status Queue Level (RxStsQLvl)
+ * interrupt routine when a SETUP packet has been received in Slave mode.
+ */
+static void dwc_otg_read_setup_packet(struct core_if *core_if, u32 * dest)
+{
+ dest[0] = dwc_read_fifo32(core_if->data_fifo[0]);
+ dest[1] = dwc_read_fifo32(core_if->data_fifo[0]);
+}
+
+/**
+ * This function handles the Rx Status Queue Level Interrupt, which
+ * indicates that there is a least one packet in the Rx FIFO. The
+ * packets are moved from the FIFO to memory, where they will be
+ * processed when the Endpoint Interrupt Register indicates Transfer
+ * Complete or SETUP Phase Done.
+ *
+ * Repeat the following until the Rx Status Queue is empty:
+ * -# Read the Receive Status Pop Register (GRXSTSP) to get Packet
+ * info
+ * -# If Receive FIFO is empty then skip to step Clear the interrupt
+ * and exit
+ * -# If SETUP Packet call dwc_otg_read_setup_packet to copy the
+ * SETUP data to the buffer
+ * -# If OUT Data Packet call dwc_otg_read_packet to copy the data
+ * to the destination buffer
+ */
+static int dwc_otg_pcd_handle_rx_status_q_level_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ ulong global_regs = core_if->core_global_regs;
+ u32 gintmask = 0;
+ u32 grxsts;
+ struct pcd_ep *ep;
+ u32 gintsts;
+
+ /* Disable the Rx Status Queue Level interrupt */
+ gintmask |= DWC_INTMSK_RXFIFO_NOT_EMPT;
+ dwc_modify32(global_regs + DWC_GINTMSK, gintmask, 0);
+
+ /* Get the Status from the top of the FIFO */
+ grxsts = dwc_read32(global_regs + DWC_GRXSTSP);
+
+ /* Get pointer to EP structure */
+ ep = get_out_ep(pcd, DWC_DM_RXSTS_CHAN_NUM_RD(grxsts));
+
+ switch (DWC_DM_RXSTS_PKT_STS_RD(grxsts)) {
+ case DWC_DSTS_GOUT_NAK:
+ break;
+ case DWC_STS_DATA_UPDT:
+ if ((grxsts & DWC_DM_RXSTS_BYTE_CNT) && ep->dwc_ep.xfer_buff) {
+ dwc_otg_read_packet(core_if, ep->dwc_ep.xfer_buff,
+ DWC_DM_RXSTS_BYTE_CNT_RD(grxsts));
+ ep->dwc_ep.xfer_count +=
+ DWC_DM_RXSTS_BYTE_CNT_RD(grxsts);
+ ep->dwc_ep.xfer_buff +=
+ DWC_DM_RXSTS_BYTE_CNT_RD(grxsts);
+ }
+ break;
+ case DWC_STS_XFER_COMP:
+ break;
+ case DWC_DSTS_SETUP_COMP:
+ break;
+ case DWC_DSTS_SETUP_UPDT:
+ dwc_otg_read_setup_packet(core_if, pcd->setup_pkt->d32);
+ ep->dwc_ep.xfer_count += DWC_DM_RXSTS_BYTE_CNT_RD(grxsts);
+ break;
+ default:
+ pr_err("RX_STS_Q Interrupt: Unknown status %d\n",
+ DWC_HM_RXSTS_PKT_STS_RD(grxsts));
+ break;
+ }
+
+ /* Enable the Rx Status Queue Level interrupt */
+ dwc_modify32(global_regs + DWC_GINTMSK, 0, gintmask);
+
+ /* Clear interrupt */
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_RXFIFO_NOT_EMPT;
+ dwc_write32(global_regs + DWC_GINTSTS, gintsts);
+
+ return 1;
+}
+
+/**
+ * This function examines the Device IN Token Learning Queue to
+ * determine the EP number of the last IN token received. This
+ * implementation is for the Mass Storage device where there are only
+ * 2 IN EPs (Control-IN and BULK-IN).
+ *
+ * The EP numbers for the first six IN Tokens are in DTKNQR1 and there
+ * are 8 EP Numbers in each of the other possible DTKNQ Registers.
+ */
+static int get_ep_of_last_in_token(struct core_if *core_if)
+{
+ ulong regs = core_if->dev_if->dev_global_regs;
+ const u32 TOKEN_Q_DEPTH =
+ DWC_HWCFG2_DEV_TKN_Q_DEPTH_RD(core_if->hwcfg2);
+ /* Number of Token Queue Registers */
+ const int DTKNQ_REG_CNT = (TOKEN_Q_DEPTH + 7) / 8;
+ u32 dtknqr1 = 0;
+ u32 in_tkn_epnums[4];
+ int ndx;
+ u32 i;
+ u32 addr = regs + DWC_DTKNQR1;
+ int epnum = 0;
+
+ /* Read the DTKNQ Registers */
+ for (i = 0; i <= DTKNQ_REG_CNT; i++) {
+ in_tkn_epnums[i] = dwc_read32(addr);
+
+ if (addr == (regs + DWC_DVBUSDIS))
+ addr = regs + DWC_DTKNQR3_DTHRCTL;
+ else
+ ++addr;
+ }
+
+ /* Copy the DTKNQR1 data to the bit field. */
+ dtknqr1 = in_tkn_epnums[0];
+
+ /* Get the EP numbers */
+ in_tkn_epnums[0] = DWC_DTKNQR1_EP_TKN_NO_RD(dtknqr1);
+ ndx = DWC_DTKNQR1_INT_TKN_Q_WR_PTR_RD(dtknqr1) - 1;
+
+ if (ndx == -1) {
+ /*
+ * Calculate the max queue position.
+ */
+ int cnt = TOKEN_Q_DEPTH;
+
+ if (TOKEN_Q_DEPTH <= 6)
+ cnt = TOKEN_Q_DEPTH - 1;
+ else if (TOKEN_Q_DEPTH <= 14)
+ cnt = TOKEN_Q_DEPTH - 7;
+ else if (TOKEN_Q_DEPTH <= 22)
+ cnt = TOKEN_Q_DEPTH - 15;
+ else
+ cnt = TOKEN_Q_DEPTH - 23;
+
+ epnum = (in_tkn_epnums[DTKNQ_REG_CNT - 1] >> (cnt * 4)) & 0xF;
+ } else {
+ if (ndx <= 5) {
+ epnum = (in_tkn_epnums[0] >> (ndx * 4)) & 0xF;
+ } else if (ndx <= 13) {
+ ndx -= 6;
+ epnum = (in_tkn_epnums[1] >> (ndx * 4)) & 0xF;
+ } else if (ndx <= 21) {
+ ndx -= 14;
+ epnum = (in_tkn_epnums[2] >> (ndx * 4)) & 0xF;
+ } else if (ndx <= 29) {
+ ndx -= 22;
+ epnum = (in_tkn_epnums[3] >> (ndx * 4)) & 0xF;
+ }
+ }
+
+ return epnum;
+}
+
+static inline int count_dwords(struct pcd_ep *ep, u32 len)
+{
+ if (len > ep->dwc_ep.maxpacket)
+ len = ep->dwc_ep.maxpacket;
+ return (len + 3) / 4;
+}
+
+/**
+ * This function writes a packet into the Tx FIFO associated with the EP. For
+ * non-periodic EPs the non-periodic Tx FIFO is written. For periodic EPs the
+ * periodic Tx FIFO associated with the EP is written with all packets for the
+ * next micro-frame.
+ *
+ * The buffer is padded to DWORD on a per packet basis in
+ * slave/dma mode if the MPS is not DWORD aligned. The last packet, if
+ * short, is also padded to a multiple of DWORD.
+ *
+ * ep->xfer_buff always starts DWORD aligned in memory and is a
+ * multiple of DWORD in length
+ *
+ * ep->xfer_len can be any number of bytes
+ *
+ * ep->xfer_count is a multiple of ep->maxpacket until the last packet
+ *
+ * FIFO access is DWORD
+ */
+static void dwc_otg_ep_write_packet(struct core_if *core_if, struct dwc_ep *ep,
+ int dma)
+{
+ u32 i;
+ u32 byte_count;
+ u32 dword_count;
+ u32 fifo;
+ u32 *data_buff = (u32 *) ep->xfer_buff;
+
+ if (ep->xfer_count >= ep->xfer_len)
+ return;
+
+ /* Find the byte length of the packet either short packet or MPS */
+ if ((ep->xfer_len - ep->xfer_count) < ep->maxpacket)
+ byte_count = ep->xfer_len - ep->xfer_count;
+ else
+ byte_count = ep->maxpacket;
+
+ /*
+ * Find the DWORD length, padded by extra bytes as neccessary if MPS
+ * is not a multiple of DWORD
+ */
+ dword_count = (byte_count + 3) / 4;
+
+ fifo = core_if->data_fifo[ep->num];
+
+ if (!dma)
+ for (i = 0; i < dword_count; i++, data_buff++)
+ dwc_write_fifo32(fifo, *data_buff);
+
+ ep->xfer_count += byte_count;
+ ep->xfer_buff += byte_count;
+ ep->dma_addr += byte_count;
+}
+
+/**
+ * This interrupt occurs when the non-periodic Tx FIFO is half-empty.
+ * The active request is checked for the next packet to be loaded into
+ * the non-periodic Tx FIFO.
+ */
+static int dwc_otg_pcd_handle_np_tx_fifo_empty_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ ulong global_regs = core_if->core_global_regs;
+ u32 txstatus = 0;
+ u32 gintsts = 0;
+ int epnum;
+ struct pcd_ep *ep;
+ u32 len;
+ int dwords;
+
+ /* Get the epnum from the IN Token Learning Queue. */
+ epnum = get_ep_of_last_in_token(core_if);
+ ep = get_in_ep(pcd, epnum);
+
+ txstatus = dwc_read32(global_regs + DWC_GNPTXSTS);
+
+ /*
+ * While there is space in the queue, space in the FIFO, and data to
+ * tranfer, write packets to the Tx FIFO
+ */
+ len = ep->dwc_ep.xfer_len - ep->dwc_ep.xfer_count;
+ dwords = count_dwords(ep, len);
+ while ((DWC_GNPTXSTS_NPTXQSPCAVAIL_RD(txstatus) > 0) &&
+ (DWC_GNPTXSTS_NPTXFSPCAVAIL_RD(txstatus) > dwords) &&
+ ep->dwc_ep.xfer_count < ep->dwc_ep.xfer_len) {
+ /*
+ * Added-sr: 2007-07-26
+ *
+ * When a new transfer will be started, mark this
+ * endpoint as active. This way it will be blocked
+ * for further transfers, until the current transfer
+ * is finished.
+ */
+ if (dwc_has_feature(core_if, DWC_LIMITED_XFER))
+ ep->dwc_ep.active = 1;
+
+ dwc_otg_ep_write_packet(core_if, &ep->dwc_ep, 0);
+ len = ep->dwc_ep.xfer_len - ep->dwc_ep.xfer_count;
+ dwords = count_dwords(ep, len);
+ txstatus = dwc_read32(global_regs + DWC_GNPTXSTS);
+ }
+
+ /* Clear nptxfempty interrupt */
+ gintsts |= DWC_INTMSK_RXFIFO_NOT_EMPT;
+ dwc_write32(global_regs + DWC_GINTSTS, gintsts);
+
+ /* Re-enable tx-fifo empty interrupt, if packets are stil pending */
+ if (len)
+ dwc_modify32(global_regs + DWC_GINTSTS, 0, gintsts);
+ return 1;
+}
+
+/**
+ * This function is called when dedicated Tx FIFO Empty interrupt occurs.
+ * The active request is checked for the next packet to be loaded into
+ * apropriate Tx FIFO.
+ */
+static int write_empty_tx_fifo(struct dwc_pcd *pcd, u32 epnum)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ ulong regs;
+ u32 txstatus = 0;
+ struct pcd_ep *ep;
+ u32 len;
+ int dwords;
+ u32 diepint = 0;
+
+ ep = get_in_ep(pcd, epnum);
+ regs = core_if->dev_if->in_ep_regs[epnum];
+ txstatus = dwc_read32(regs + DWC_DTXFSTS);
+
+ /*
+ * While there is space in the queue, space in the FIFO and data to
+ * tranfer, write packets to the Tx FIFO
+ */
+ len = ep->dwc_ep.xfer_len - ep->dwc_ep.xfer_count;
+ dwords = count_dwords(ep, len);
+ while (DWC_DTXFSTS_TXFSSPC_AVAI_RD(txstatus) > dwords
+ && ep->dwc_ep.xfer_count < ep->dwc_ep.xfer_len
+ && ep->dwc_ep.xfer_len != 0) {
+ dwc_otg_ep_write_packet(core_if, &ep->dwc_ep, 0);
+ len = ep->dwc_ep.xfer_len - ep->dwc_ep.xfer_count;
+ dwords = count_dwords(ep, len);
+ txstatus = dwc_read32(regs + DWC_DTXFSTS);
+ }
+ /* Clear emptyintr */
+ diepint = DWC_DIEPINT_TXFIFO_EMPTY_RW(diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, epnum), diepint);
+ return 1;
+}
+
+/**
+ * This function is called when the Device is disconnected. It stops any active
+ * requests and informs the Gadget driver of the disconnect.
+ */
+void dwc_otg_pcd_stop(struct dwc_pcd *pcd)
+{
+ int i, num_in_eps, num_out_eps;
+ struct pcd_ep *ep;
+ u32 intr_mask = 0;
+ ulong global_regs = GET_CORE_IF(pcd)->core_global_regs;
+
+ num_in_eps = GET_CORE_IF(pcd)->dev_if->num_in_eps;
+ num_out_eps = GET_CORE_IF(pcd)->dev_if->num_out_eps;
+
+ /* Don't disconnect drivers more than once */
+ if (pcd->ep0state == EP0_DISCONNECT)
+ return;
+ pcd->ep0state = EP0_DISCONNECT;
+
+ /* Reset the OTG state. */
+ dwc_otg_pcd_update_otg(pcd, 1);
+
+ /* Disable the NP Tx Fifo Empty Interrupt. */
+ intr_mask |= DWC_INTMSK_NP_TXFIFO_EMPT;
+ dwc_modify32(global_regs + DWC_GINTMSK, intr_mask, 0);
+
+ /* Flush the FIFOs */
+ dwc_otg_flush_tx_fifo(GET_CORE_IF(pcd), 0);
+ dwc_otg_flush_rx_fifo(GET_CORE_IF(pcd));
+
+ /* Prevent new request submissions, kill any outstanding requests */
+ ep = &pcd->ep0;
+ request_nuke(ep);
+
+ /* Prevent new request submissions, kill any outstanding requests */
+ for (i = 0; i < num_in_eps; i++)
+ request_nuke((struct pcd_ep *)&pcd->in_ep[i]);
+
+ /* Prevent new request submissions, kill any outstanding requests */
+ for (i = 0; i < num_out_eps; i++)
+ request_nuke((struct pcd_ep *)&pcd->out_ep[i]);
+
+ /* Report disconnect; the driver is already quiesced */
+ if (pcd->driver && pcd->driver->disconnect) {
+ spin_unlock(&pcd->lock);
+ pcd->driver->disconnect(&pcd->gadget);
+ spin_lock(&pcd->lock);
+ }
+}
+
+/**
+ * This interrupt indicates that ...
+ */
+static int dwc_otg_pcd_handle_i2c_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts;
+
+ pr_info("Interrupt handler not implemented for i2cintr\n");
+
+ /* Turn off and clean the interrupt */
+ intr_mask |= DWC_INTMSK_I2C_INTR;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_I2C_INTR;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+
+ return 1;
+}
+
+/**
+ * This interrupt indicates that ...
+ */
+static int dwc_otg_pcd_handle_early_suspend_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts;
+
+ pr_info("Early Suspend Detected\n");
+
+ /* Turn off and clean the interrupt */
+ intr_mask |= DWC_INTMSK_EARLY_SUSP;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_EARLY_SUSP;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+
+ return 1;
+}
+
+/**
+ * This function configures EPO to receive SETUP packets.
+ *
+ * Program the following fields in the endpoint specific registers for Control
+ * OUT EP 0, in order to receive a setup packet:
+ *
+ * - DOEPTSIZ0.Packet Count = 3 (To receive up to 3 back to back setup packets)
+ *
+ * - DOEPTSIZE0.Transfer Size = 24 Bytes (To receive up to 3 back to back setup
+ * packets)
+ *
+ * In DMA mode, DOEPDMA0 Register with a memory address to store any setup
+ * packets received
+ */
+static void ep0_out_start(struct core_if *core_if, struct dwc_pcd *pcd)
+{
+ struct device_if *dev_if = core_if->dev_if;
+ u32 doeptsize0 = 0;
+
+ doeptsize0 = DWC_DEPTSIZ0_SUPCNT_RW(doeptsize0, 3);
+ doeptsize0 = DWC_DEPTSIZ0_PKT_CNT_RW(doeptsize0, 1);
+ doeptsize0 = DWC_DEPTSIZ0_XFER_SIZ_RW(doeptsize0, 8 * 3);
+ dwc_write32(dev_if->out_ep_regs[0] + DWC_DOEPTSIZ, doeptsize0);
+
+ if (core_if->dma_enable) {
+ u32 doepctl = 0;
+
+ dwc_write32(dev_if->out_ep_regs[0] + DWC_DOEPDMA,
+ pcd->setup_pkt_dma_handle);
+ doepctl = DWC_DEPCTL_EPENA_RW(doepctl, 1);
+ doepctl = DWC_DEPCTL_ACT_EP_RW(doepctl, 1);
+ dwc_write32(out_ep_ctl_reg(pcd, 0), doepctl);
+ }
+}
+
+/**
+ * This interrupt occurs when a USB Reset is detected. When the USB Reset
+ * Interrupt occurs the device state is set to DEFAULT and the EP0 state is set
+ * to IDLE.
+ *
+ * Set the NAK bit for all OUT endpoints (DOEPCTLn.SNAK = 1)
+ *
+ * Unmask the following interrupt bits:
+ * - DAINTMSK.INEP0 = 1 (Control 0 IN endpoint)
+ * - DAINTMSK.OUTEP0 = 1 (Control 0 OUT endpoint)
+ * - DOEPMSK.SETUP = 1
+ * - DOEPMSK.XferCompl = 1
+ * - DIEPMSK.XferCompl = 1
+ * - DIEPMSK.TimeOut = 1
+ *
+ * Program the following fields in the endpoint specific registers for Control
+ * OUT EP 0, in order to receive a setup packet
+ * - DOEPTSIZ0.Packet Count = 3 (To receive up to 3 back to back setup packets)
+ * - DOEPTSIZE0.Transfer Size = 24 Bytes (To receive up to 3 back to back setup
+ * packets)
+ *
+ * - In DMA mode, DOEPDMA0 Register with a memory address to store any setup
+ * packets received
+ *
+ * At this point, all the required initialization, except for enabling
+ * the control 0 OUT endpoint is done, for receiving SETUP packets.
+ *
+ * Note that the bits in the Device IN endpoint mask register (diepmsk) are laid
+ * out exactly the same as the Device IN endpoint interrupt register (diepint.)
+ * Likewise for Device OUT endpoint mask / interrupt registers (doepmsk /
+ * doepint.)
+ */
+static int dwc_otg_pcd_handle_usb_reset_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ u32 doepctl = 0;
+ u32 daintmsk = 0;
+ u32 doepmsk = 0;
+ u32 diepmsk = 0;
+ u32 dcfg = 0;
+ u32 resetctl = 0;
+ u32 dctl = 0;
+ u32 i;
+ u32 gintsts = 0;
+
+ pr_info("USB RESET\n");
+
+ /* reset the HNP settings */
+ dwc_otg_pcd_update_otg(pcd, 1);
+
+ /* Clear the Remote Wakeup Signalling */
+ dctl = DEC_DCTL_REMOTE_WAKEUP_SIG(dctl, 1);
+ dwc_modify32(dev_ctl_reg(pcd), dctl, 0);
+
+ /* Set NAK for all OUT EPs */
+ doepctl = DWC_DEPCTL_SET_NAK_RW(doepctl, 1);
+ for (i = 0; i <= dev_if->num_out_eps; i++)
+ dwc_write32(out_ep_ctl_reg(pcd, i), doepctl);
+
+ /* Flush the NP Tx FIFO */
+ dwc_otg_flush_tx_fifo(core_if, 0);
+
+ /* Flush the Learning Queue */
+ resetctl |= DWC_RSTCTL_TKN_QUE_FLUSH;
+ dwc_write32(core_if->core_global_regs + DWC_GRSTCTL, resetctl);
+
+ daintmsk |= DWC_DAINT_INEP00;
+ daintmsk |= DWC_DAINT_OUTEP00;
+ dwc_write32(dev_if->dev_global_regs + DWC_DAINTMSK, daintmsk);
+
+ doepmsk = DWC_DOEPMSK_SETUP_DONE_RW(doepmsk, 1);
+ doepmsk = DWC_DOEPMSK_AHB_ERROR_RW(doepmsk, 1);
+ doepmsk = DWC_DOEPMSK_EP_DISA_RW(doepmsk, 1);
+ doepmsk = DWC_DOEPMSK_TX_COMPL_RW(doepmsk, 1);
+ dwc_write32(dev_if->dev_global_regs + DWC_DOEPMSK, doepmsk);
+
+ diepmsk = DWC_DIEPMSK_TX_CMPL_RW(diepmsk, 1);
+ diepmsk = DWC_DIEPMSK_TOUT_COND_RW(diepmsk, 1);
+ diepmsk = DWC_DIEPMSK_EP_DISA_RW(diepmsk, 1);
+ diepmsk = DWC_DIEPMSK_AHB_ERROR_RW(diepmsk, 1);
+ diepmsk = DWC_DIEPMSK_IN_TKN_TX_EMPTY_RW(diepmsk, 1);
+ dwc_write32(dev_if->dev_global_regs + DWC_DIEPMSK, diepmsk);
+
+ /* Reset Device Address */
+ dcfg = dwc_read32(dev_if->dev_global_regs + DWC_DCFG);
+ dcfg = DWC_DCFG_DEV_ADDR_WR(dcfg, 0);
+ dwc_write32(dev_if->dev_global_regs + DWC_DCFG, dcfg);
+
+ /* setup EP0 to receive SETUP packets */
+ ep0_out_start(core_if, pcd);
+
+ /* Clear interrupt */
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_USB_RST;
+ dwc_write32((core_if->core_global_regs) + DWC_GINTSTS, gintsts);
+
+ return 1;
+}
+
+/**
+ * Get the device speed from the device status register and convert it
+ * to USB speed constant.
+ */
+static int get_device_speed(struct dwc_pcd *pcd)
+{
+ u32 dsts = 0;
+ enum usb_device_speed speed = USB_SPEED_UNKNOWN;
+
+ dsts = dwc_read32(dev_sts_reg(pcd));
+
+ switch (DWC_DSTS_ENUM_SPEED_RD(dsts)) {
+ case DWC_DSTS_ENUMSPD_HS_PHY_30MHZ_OR_60MHZ:
+ speed = USB_SPEED_HIGH;
+ break;
+ case DWC_DSTS_ENUMSPD_FS_PHY_30MHZ_OR_60MHZ:
+ case DWC_DSTS_ENUMSPD_FS_PHY_48MHZ:
+ speed = USB_SPEED_FULL;
+ break;
+ case DWC_DSTS_ENUMSPD_LS_PHY_6MHZ:
+ speed = USB_SPEED_LOW;
+ break;
+ }
+ return speed;
+}
+
+/**
+ * This function enables EP0 OUT to receive SETUP packets and configures EP0
+ * IN for transmitting packets. It is normally called when the "Enumeration
+ * Done" interrupt occurs.
+ */
+static void dwc_otg_ep0_activate(struct core_if *core_if, struct dwc_ep *ep)
+{
+ struct device_if *dev_if = core_if->dev_if;
+ u32 dsts;
+ u32 diepctl = 0;
+ u32 doepctl = 0;
+ u32 dctl = 0;
+
+ /* Read the Device Status and Endpoint 0 Control registers */
+ dsts = dwc_read32(dev_if->dev_global_regs + DWC_DSTS);
+ diepctl = dwc_read32(dev_if->in_ep_regs[0] + DWC_DIEPCTL);
+ doepctl = dwc_read32(dev_if->out_ep_regs[0] + DWC_DOEPCTL);
+
+ /* Set the MPS of the IN EP based on the enumeration speed */
+ switch (DWC_DSTS_ENUM_SPEED_RD(dsts)) {
+ case DWC_DSTS_ENUMSPD_HS_PHY_30MHZ_OR_60MHZ:
+ case DWC_DSTS_ENUMSPD_FS_PHY_30MHZ_OR_60MHZ:
+ case DWC_DSTS_ENUMSPD_FS_PHY_48MHZ:
+ diepctl = DWC_DEPCTL_MPS_RW(diepctl, DWC_DEP0CTL_MPS_64);
+ break;
+ case DWC_DSTS_ENUMSPD_LS_PHY_6MHZ:
+ diepctl = DWC_DEPCTL_MPS_RW(diepctl, DWC_DEP0CTL_MPS_8);
+ break;
+ }
+ dwc_write32(dev_if->in_ep_regs[0] + DWC_DIEPCTL, diepctl);
+
+ /* Enable OUT EP for receive */
+ doepctl = DWC_DEPCTL_EPENA_RW(doepctl, 1);
+ dwc_write32(dev_if->out_ep_regs[0] + DWC_DOEPCTL, doepctl);
+
+ dctl = DWC_DCTL_CLR_CLBL_NP_IN_NAK(dctl, 1);
+ dwc_modify32(dev_if->dev_global_regs + DWC_DCTL, dctl, dctl);
+}
+
+/**
+ * Read the device status register and set the device speed in the
+ * data structure.
+ * Set up EP0 to receive SETUP packets by calling dwc_ep0_activate.
+ */
+static int dwc_otg_pcd_handle_enum_done_intr(struct dwc_pcd *pcd)
+{
+ struct pcd_ep *ep0 = &pcd->ep0;
+ u32 gintsts;
+ u32 gusbcfg;
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ ulong global_regs = core_if->core_global_regs;
+ u32 gsnpsid = global_regs + DWC_GSNPSID;
+ u8 utmi16b, utmi8b;
+
+ if (gsnpsid >= (u32) 0x4f54260a) {
+ utmi16b = 5;
+ utmi8b = 9;
+ } else {
+ utmi16b = 4;
+ utmi8b = 8;
+ }
+ dwc_otg_ep0_activate(GET_CORE_IF(pcd), &ep0->dwc_ep);
+
+ pcd->ep0state = EP0_IDLE;
+ ep0->stopped = 0;
+ pcd->gadget.speed = get_device_speed(pcd);
+
+ gusbcfg = dwc_read32(global_regs + DWC_GUSBCFG);
+
+ /* Set USB turnaround time based on device speed and PHY interface. */
+ if (pcd->gadget.speed == USB_SPEED_HIGH) {
+ switch (DWC_HWCFG2_HS_PHY_TYPE_RD(core_if->hwcfg2)) {
+ case DWC_HWCFG2_HS_PHY_TYPE_ULPI:
+ gusbcfg =
+ (gusbcfg & (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(9);
+ break;
+ case DWC_HWCFG2_HS_PHY_TYPE_UTMI:
+ if (DWC_HWCFG4_UTMI_PHY_DATA_WIDTH_RD(core_if->hwcfg4)
+ == 0)
+ gusbcfg =
+ (gusbcfg &
+ (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(utmi8b);
+ else if (DWC_HWCFG4_UTMI_PHY_DATA_WIDTH_RD
+ (core_if->hwcfg4) == 1)
+ gusbcfg =
+ (gusbcfg &
+ (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(utmi16b);
+ else if (core_if->core_params->phy_utmi_width == 8)
+ gusbcfg =
+ (gusbcfg &
+ (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(utmi8b);
+ else
+ gusbcfg =
+ (gusbcfg &
+ (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(utmi16b);
+ break;
+ case DWC_HWCFG2_HS_PHY_TYPE_UTMI_ULPI:
+ if (gusbcfg & DWC_USBCFG_ULPI_UTMI_SEL) {
+ gusbcfg =
+ (gusbcfg &
+ (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(9);
+ } else {
+ if (core_if->core_params->phy_utmi_width == 16)
+ gusbcfg =
+ (gusbcfg &
+ (~
+ ((u32) DWC_USBCFG_TRN_TIME(0xf))))
+ | DWC_USBCFG_TRN_TIME(utmi16b);
+ else
+ gusbcfg =
+ (gusbcfg &
+ (~
+ ((u32) DWC_USBCFG_TRN_TIME(0xf))))
+ | DWC_USBCFG_TRN_TIME(utmi8b);
+ }
+ break;
+ }
+ } else {
+ /* Full or low speed */
+ gusbcfg = (gusbcfg & (~((u32) DWC_USBCFG_TRN_TIME(0xf)))) |
+ DWC_USBCFG_TRN_TIME(9);
+ }
+ dwc_write32(global_regs + DWC_GUSBCFG, gusbcfg);
+
+ /* Clear interrupt */
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_ENUM_DONE;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+
+ return 1;
+}
+
+/**
+ * This interrupt indicates that the ISO OUT Packet was dropped due to
+ * Rx FIFO full or Rx Status Queue Full. If this interrupt occurs
+ * read all the data from the Rx FIFO.
+ */
+static int dwc_otg_pcd_handle_isoc_out_packet_dropped_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts;
+
+ pr_info("Interrupt Handler not implemented for ISOC Out " "Dropped\n");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_ISYNC_OUTPKT_DRP;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_ISYNC_OUTPKT_DRP;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+
+ return 1;
+}
+
+/**
+ * This interrupt indicates the end of the portion of the micro-frame
+ * for periodic transactions. If there is a periodic transaction for
+ * the next frame, load the packets into the EP periodic Tx FIFO.
+ */
+static int dwc_otg_pcd_handle_end_periodic_frame_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts;
+
+ pr_info("Interrupt handler not implemented for End of "
+ "Periodic Portion of Micro-Frame Interrupt");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_END_OF_PFRM;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_END_OF_PFRM;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+
+ return 1;
+}
+
+/**
+ * This interrupt indicates that EP of the packet on the top of the
+ * non-periodic Tx FIFO does not match EP of the IN Token received.
+ *
+ * The "Device IN Token Queue" Registers are read to determine the
+ * order the IN Tokens have been received. The non-periodic Tx FIFO is flushed,
+ * so it can be reloaded in the order seen in the IN Token Queue.
+ */
+static int dwc_otg_pcd_handle_ep_mismatch_intr(struct core_if *core_if)
+{
+ u32 intr_mask = 0;
+ u32 gintsts;
+
+ pr_info("Interrupt handler not implemented for End Point "
+ "Mismatch\n");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_ENDP_MIS_MTCH;
+ dwc_modify32((core_if->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts = 0;
+ gintsts |= DWC_INTSTS_ENDP_MIS_MTCH;
+ dwc_write32((core_if->core_global_regs) + DWC_GINTSTS, gintsts);
+ return 1;
+}
+
+/**
+ * This funcion stalls EP0.
+ */
+static void ep0_do_stall(struct dwc_pcd *pcd, const int val)
+{
+ struct pcd_ep *ep0 = &pcd->ep0;
+ struct usb_ctrlrequest *ctrl = &pcd->setup_pkt->req;
+
+ pr_warning("req %02x.%02x protocol STALL; err %d\n",
+ ctrl->bRequestType, ctrl->bRequest, val);
+
+ ep0->dwc_ep.is_in = 1;
+ dwc_otg_ep_set_stall(pcd->otg_dev->core_if, &ep0->dwc_ep);
+
+ pcd->ep0.stopped = 1;
+ pcd->ep0state = EP0_IDLE;
+ ep0_out_start(GET_CORE_IF(pcd), pcd);
+}
+
+/**
+ * This functions delegates the setup command to the gadget driver.
+ */
+static void do_gadget_setup(struct dwc_pcd *pcd, struct usb_ctrlrequest *ctrl)
+{
+ if (pcd->driver && pcd->driver->setup) {
+ int ret;
+
+ spin_unlock(&pcd->lock);
+ ret = pcd->driver->setup(&pcd->gadget, ctrl);
+ spin_lock(&pcd->lock);
+
+ if (ret < 0)
+ ep0_do_stall(pcd, ret);
+
+ /** This is a g_file_storage gadget driver specific
+ * workaround: a DELAYED_STATUS result from the fsg_setup
+ * routine will result in the gadget queueing a EP0 IN status
+ * phase for a two-stage control transfer.
+ *
+ * Exactly the same as a SET_CONFIGURATION/SET_INTERFACE except
+ * that this is a class specific request. Need a generic way to
+ * know when the gadget driver will queue the status phase.
+ *
+ * Can we assume when we call the gadget driver setup() function
+ * that it will always queue and require the following flag?
+ * Need to look into this.
+ */
+ if (ret == 256 + 999)
+ pcd->request_config = 1;
+ }
+}
+
+/**
+ * This function starts the Zero-Length Packet for the IN status phase
+ * of a 2 stage control transfer.
+ */
+static void do_setup_in_status_phase(struct dwc_pcd *pcd)
+{
+ struct pcd_ep *ep0 = &pcd->ep0;
+
+ if (pcd->ep0state == EP0_STALL)
+ return;
+
+ pcd->ep0state = EP0_STATUS;
+
+ ep0->dwc_ep.xfer_len = 0;
+ ep0->dwc_ep.xfer_count = 0;
+ ep0->dwc_ep.is_in = 1;
+ ep0->dwc_ep.dma_addr = pcd->setup_pkt_dma_handle;
+ dwc_otg_ep0_start_transfer(GET_CORE_IF(pcd), &ep0->dwc_ep);
+
+ /* Prepare for more SETUP Packets */
+ ep0_out_start(GET_CORE_IF(pcd), pcd);
+}
+
+/**
+ * This function starts the Zero-Length Packet for the OUT status phase
+ * of a 2 stage control transfer.
+ */
+static void do_setup_out_status_phase(struct dwc_pcd *pcd)
+{
+ struct pcd_ep *ep0 = &pcd->ep0;
+
+ if (pcd->ep0state == EP0_STALL)
+ return;
+ pcd->ep0state = EP0_STATUS;
+
+ ep0->dwc_ep.xfer_len = 0;
+ ep0->dwc_ep.xfer_count = 0;
+ ep0->dwc_ep.is_in = 0;
+ ep0->dwc_ep.dma_addr = pcd->setup_pkt_dma_handle;
+ dwc_otg_ep0_start_transfer(GET_CORE_IF(pcd), &ep0->dwc_ep);
+
+ /* Prepare for more SETUP Packets */
+ ep0_out_start(GET_CORE_IF(pcd), pcd);
+}
+
+/**
+ * Clear the EP halt (STALL) and if pending requests start the
+ * transfer.
+ */
+static void pcd_clear_halt(struct dwc_pcd *pcd, struct pcd_ep *ep)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+
+ if (!ep->dwc_ep.stall_clear_flag)
+ dwc_otg_ep_clear_stall(core_if, &ep->dwc_ep);
+
+ /* Reactive the EP */
+ dwc_otg_ep_activate(core_if, &ep->dwc_ep);
+
+ if (ep->stopped) {
+ ep->stopped = 0;
+ /* If there is a request in the EP queue start it */
+
+ /*
+ * start_next_request(), outside of interrupt context at some
+ * time after the current time, after a clear-halt setup packet.
+ * Still need to implement ep mismatch in the future if a gadget
+ * ever uses more than one endpoint at once
+ */
+ if (core_if->dma_enable) {
+ ep->queue_sof = 1;
+ tasklet_schedule(pcd->start_xfer_tasklet);
+ } else {
+ /*
+ * Added-sr: 2007-07-26
+ *
+ * To re-enable this endpoint it's important to
+ * set this next_ep number. Otherwise the endpoint
+ * will not get active again after stalling.
+ */
+ if (dwc_has_feature(core_if, DWC_LIMITED_XFER))
+ start_next_request(ep);
+ }
+ }
+
+ /* Start Control Status Phase */
+ do_setup_in_status_phase(pcd);
+}
+
+/**
+ * This function is called when the SET_FEATURE TEST_MODE Setup packet is sent
+ * from the host. The Device Control register is written with the Test Mode
+ * bits set to the specified Test Mode. This is done as a tasklet so that the
+ * "Status" phase of the control transfer completes before transmitting the TEST
+ * packets.
+ *
+ */
+static void do_test_mode(unsigned long data)
+{
+ u32 dctl = 0;
+ struct dwc_pcd *pcd = (struct dwc_pcd *)data;
+ int test_mode = pcd->test_mode;
+
+ dctl = dwc_read32(dev_ctl_reg(pcd));
+ switch (test_mode) {
+ case 1: /* TEST_J */
+ dctl = DWC_DCTL_TST_CTL(dctl, 1);
+ break;
+ case 2: /* TEST_K */
+ dctl = DWC_DCTL_TST_CTL(dctl, 2);
+ break;
+ case 3: /* TEST_SE0_NAK */
+ dctl = DWC_DCTL_TST_CTL(dctl, 3);
+ break;
+ case 4: /* TEST_PACKET */
+ dctl = DWC_DCTL_TST_CTL(dctl, 4);
+ break;
+ case 5: /* TEST_FORCE_ENABLE */
+ dctl = DWC_DCTL_TST_CTL(dctl, 5);
+ break;
+ }
+ dwc_write32(dev_ctl_reg(pcd), dctl);
+}
+
+/**
+ * This function process the SET_FEATURE Setup Commands.
+ */
+static void do_set_feature(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ ulong regs = core_if->core_global_regs;
+ struct usb_ctrlrequest ctrl = pcd->setup_pkt->req;
+ int otg_cap = core_if->core_params->otg_cap;
+ u32 gotgctl = 0;
+
+ switch (ctrl.bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ switch (__le16_to_cpu(ctrl.wValue)) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ pcd->remote_wakeup_enable = 1;
+ break;
+ case USB_DEVICE_TEST_MODE:
+ /*
+ * Setup the Test Mode tasklet to do the Test
+ * Packet generation after the SETUP Status
+ * phase has completed.
+ */
+
+ pcd->test_mode_tasklet.next = NULL;
+ pcd->test_mode_tasklet.state = 0;
+ atomic_set(&pcd->test_mode_tasklet.count, 0);
+
+ pcd->test_mode_tasklet.func = do_test_mode;
+ pcd->test_mode_tasklet.data = (unsigned long)pcd;
+ pcd->test_mode = __le16_to_cpu(ctrl.wIndex) >> 8;
+ tasklet_schedule(&pcd->test_mode_tasklet);
+
+ break;
+ case USB_DEVICE_B_HNP_ENABLE:
+ /* dev may initiate HNP */
+ if (otg_cap == DWC_OTG_CAP_PARAM_HNP_SRP_CAPABLE) {
+ pcd->b_hnp_enable = 1;
+ dwc_otg_pcd_update_otg(pcd, 0);
+ /*
+ * gotgctl.devhnpen cleared by a
+ * USB Reset?
+ */
+ gotgctl |= DWC_GCTL_DEV_HNP_ENA;
+ gotgctl |= DWC_GCTL_HNP_REQ;
+ dwc_write32(regs + DWC_GOTGCTL, gotgctl);
+ } else {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ }
+ break;
+ case USB_DEVICE_A_HNP_SUPPORT:
+ /* RH port supports HNP */
+ if (otg_cap == DWC_OTG_CAP_PARAM_HNP_SRP_CAPABLE) {
+ pcd->a_hnp_support = 1;
+ dwc_otg_pcd_update_otg(pcd, 0);
+ } else {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ }
+ break;
+ case USB_DEVICE_A_ALT_HNP_SUPPORT:
+ /* other RH port does */
+ if (otg_cap == DWC_OTG_CAP_PARAM_HNP_SRP_CAPABLE) {
+ pcd->a_alt_hnp_support = 1;
+ dwc_otg_pcd_update_otg(pcd, 0);
+ } else {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ }
+ break;
+ }
+ do_setup_in_status_phase(pcd);
+ break;
+ case USB_RECIP_INTERFACE:
+ do_gadget_setup(pcd, &ctrl);
+ break;
+ case USB_RECIP_ENDPOINT:
+ if (__le16_to_cpu(ctrl.wValue) == USB_ENDPOINT_HALT) {
+ struct pcd_ep *ep;
+
+ ep = get_ep_by_addr(pcd, __le16_to_cpu(ctrl.wIndex));
+
+ if (ep == NULL) {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ return;
+ }
+
+ ep->stopped = 1;
+ dwc_otg_ep_set_stall(core_if, &ep->dwc_ep);
+ }
+ do_setup_in_status_phase(pcd);
+ break;
+ }
+}
+
+/**
+ * This function process the CLEAR_FEATURE Setup Commands.
+ */
+static void do_clear_feature(struct dwc_pcd *pcd)
+{
+ struct usb_ctrlrequest ctrl = pcd->setup_pkt->req;
+ struct pcd_ep *ep;
+
+ switch (ctrl.bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ switch (__le16_to_cpu(ctrl.wValue)) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ pcd->remote_wakeup_enable = 0;
+ break;
+ case USB_DEVICE_TEST_MODE:
+ /* Add CLEAR_FEATURE for TEST modes. */
+ break;
+ }
+ do_setup_in_status_phase(pcd);
+ break;
+ case USB_RECIP_ENDPOINT:
+ ep = get_ep_by_addr(pcd, __le16_to_cpu(ctrl.wIndex));
+ if (ep == NULL) {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ return;
+ }
+
+ pcd_clear_halt(pcd, ep);
+ break;
+ }
+}
+
+/**
+ * This function processes SETUP commands. In Linux, the USB Command processing
+ * is done in two places - the first being the PCD and the second in the Gadget
+ * Driver (for example, the File-Backed Storage Gadget Driver).
+ *
+ * GET_STATUS: Command is processed as defined in chapter 9 of the USB 2.0
+ * Specification chapter 9
+ *
+ * CLEAR_FEATURE: The Device and Endpoint requests are the ENDPOINT_HALT feature
+ * is procesed, all others the interface requests are ignored.
+ *
+ * SET_FEATURE: The Device and Endpoint requests are processed by the PCD.
+ * Interface requests are passed to the Gadget Driver.
+ *
+ * SET_ADDRESS: PCD, Program the DCFG reg, with device address received
+ *
+ * GET_DESCRIPTOR: Gadget Driver, Return the requested descriptor
+ *
+ * SET_DESCRIPTOR: Gadget Driver, Optional - not implemented by any of the
+ * existing Gadget Drivers.
+ *
+ * SET_CONFIGURATION: Gadget Driver, Disable all EPs and enable EPs for new
+ * configuration.
+ *
+ * GET_CONFIGURATION: Gadget Driver, Return the current configuration
+ *
+ * SET_INTERFACE: Gadget Driver, Disable all EPs and enable EPs for new
+ * configuration.
+ *
+ * GET_INTERFACE: Gadget Driver, Return the current interface.
+ *
+ * SYNC_FRAME: Display debug message.
+ *
+ * When the SETUP Phase Done interrupt occurs, the PCD SETUP commands are
+ * processed by pcd_setup. Calling the Function Driver's setup function from
+ * pcd_setup processes the gadget SETUP commands.
+ */
+static void pcd_setup(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ struct usb_ctrlrequest ctrl = pcd->setup_pkt->req;
+ struct pcd_ep *ep;
+ struct pcd_ep *ep0 = &pcd->ep0;
+ u16 *status = pcd->status_buf;
+ u32 doeptsize0 = 0;
+
+ doeptsize0 = dwc_read32(dev_if->out_ep_regs[0] + DWC_DOEPTSIZ);
+
+ /* handle > 1 setup packet , assert error for now */
+ if (core_if->dma_enable && (DWC_DEPTSIZ0_SUPCNT_RD(doeptsize0) < 2))
+ pr_err("\n\n CANNOT handle > 1 setup packet in "
+ "DMA mode\n\n");
+
+ /* Clean up the request queue */
+ request_nuke(ep0);
+ ep0->stopped = 0;
+
+ if (ctrl.bRequestType & USB_DIR_IN) {
+ ep0->dwc_ep.is_in = 1;
+ pcd->ep0state = EP0_IN_DATA_PHASE;
+ } else {
+ ep0->dwc_ep.is_in = 0;
+ pcd->ep0state = EP0_OUT_DATA_PHASE;
+ }
+
+ if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD) {
+ /*
+ * Handle non-standard (class/vendor) requests in the gadget
+ * driver
+ */
+ do_gadget_setup(pcd, &ctrl);
+ return;
+ }
+
+ switch (ctrl.bRequest) {
+ case USB_REQ_GET_STATUS:
+ switch (ctrl.bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ *status = 0x1; /* Self powered */
+ *status |= pcd->remote_wakeup_enable << 1;
+ break;
+ case USB_RECIP_INTERFACE:
+ *status = 0;
+ break;
+ case USB_RECIP_ENDPOINT:
+ ep = get_ep_by_addr(pcd, __le16_to_cpu(ctrl.wIndex));
+ if (ep == NULL || __le16_to_cpu(ctrl.wLength) > 2) {
+ ep0_do_stall(pcd, -EOPNOTSUPP);
+ return;
+ }
+ *status = ep->stopped;
+ break;
+ }
+
+ *status = __cpu_to_le16(*status);
+
+ pcd->ep0_pending = 1;
+ ep0->dwc_ep.start_xfer_buff = (u8 *) status;
+ ep0->dwc_ep.xfer_buff = (u8 *) status;
+ ep0->dwc_ep.dma_addr = pcd->status_buf_dma_handle;
+ ep0->dwc_ep.xfer_len = 2;
+ ep0->dwc_ep.xfer_count = 0;
+ ep0->dwc_ep.total_len = ep0->dwc_ep.xfer_len;
+ dwc_otg_ep0_start_transfer(GET_CORE_IF(pcd), &ep0->dwc_ep);
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ do_clear_feature(pcd);
+ break;
+ case USB_REQ_SET_FEATURE:
+ do_set_feature(pcd);
+ break;
+ case USB_REQ_SET_ADDRESS:
+ if (ctrl.bRequestType == USB_RECIP_DEVICE) {
+ u32 dcfg = 0;
+
+ dcfg = DWC_DCFG_DEV_ADDR_WR(dcfg,
+ __le16_to_cpu(ctrl.wValue));
+ dwc_modify32(dev_if->dev_global_regs + DWC_DCFG,
+ 0, dcfg);
+ do_setup_in_status_phase(pcd);
+ return;
+ }
+ break;
+ case USB_REQ_SET_INTERFACE:
+ case USB_REQ_SET_CONFIGURATION:
+ pcd->request_config = 1; /* Configuration changed */
+ do_gadget_setup(pcd, &ctrl);
+ break;
+ case USB_REQ_SYNCH_FRAME:
+ do_gadget_setup(pcd, &ctrl);
+ break;
+ default:
+ /* Call the Gadget Driver's setup functions */
+ do_gadget_setup(pcd, &ctrl);
+ break;
+ }
+}
+
+/**
+ * This function completes the ep0 control transfer.
+ */
+static int ep0_complete_request(struct pcd_ep *ep)
+{
+ struct core_if *core_if = GET_CORE_IF(ep->pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ ulong in_regs = dev_if->in_ep_regs[ep->dwc_ep.num];
+ u32 deptsiz = 0;
+ struct pcd_request *req;
+ int is_last = 0;
+ struct dwc_pcd *pcd = ep->pcd;
+
+ if (pcd->ep0_pending && list_empty(&ep->queue)) {
+ if (ep->dwc_ep.is_in)
+ do_setup_out_status_phase(pcd);
+ else
+ do_setup_in_status_phase(pcd);
+
+ pcd->ep0_pending = 0;
+ pcd->ep0state = EP0_STATUS;
+ return 1;
+ }
+
+ if (list_empty(&ep->queue))
+ return 0;
+
+ req = list_entry(ep->queue.next, struct pcd_request, queue);
+
+ if (pcd->ep0state == EP0_STATUS) {
+ is_last = 1;
+ } else if (ep->dwc_ep.is_in) {
+ deptsiz = dwc_read32(in_regs + DWC_DIEPTSIZ);
+
+ if (DWC_DEPTSIZ0_XFER_SIZ_RD(deptsiz) == 0) {
+ req->req.actual = ep->dwc_ep.xfer_count;
+ do_setup_out_status_phase(pcd);
+ }
+ } else {
+ /* This is ep0-OUT */
+ req->req.actual = ep->dwc_ep.xfer_count;
+ do_setup_in_status_phase(pcd);
+ }
+
+ /* Complete the request */
+ if (is_last) {
+ request_done(ep, req, 0);
+ ep->dwc_ep.start_xfer_buff = NULL;
+ ep->dwc_ep.xfer_buff = NULL;
+ ep->dwc_ep.xfer_len = 0;
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * This function completes the request for the EP. If there are additional
+ * requests for the EP in the queue they will be started.
+ */
+static void complete_ep(struct pcd_ep *ep)
+{
+ struct core_if *core_if = GET_CORE_IF(ep->pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ ulong in_ep_regs = dev_if->in_ep_regs[ep->dwc_ep.num];
+ u32 deptsiz = 0;
+ struct pcd_request *req = NULL;
+ int is_last = 0;
+
+ /* Get any pending requests */
+ if (!list_empty(&ep->queue))
+ req = list_entry(ep->queue.next, struct pcd_request, queue);
+
+ if (ep->dwc_ep.is_in) {
+ deptsiz = dwc_read32(in_ep_regs + DWC_DIEPTSIZ);
+
+ if (core_if->dma_enable && !DWC_DEPTSIZ_XFER_SIZ_RD(deptsiz))
+ ep->dwc_ep.xfer_count = ep->dwc_ep.xfer_len;
+
+ if (DWC_DEPTSIZ_XFER_SIZ_RD(deptsiz) == 0 &&
+ DWC_DEPTSIZ_PKT_CNT_RD(deptsiz) == 0 &&
+ ep->dwc_ep.xfer_count == ep->dwc_ep.xfer_len)
+ is_last = 1;
+ else
+ pr_warning("Incomplete transfer (%s-%s "
+ "[siz=%d pkt=%d])\n", ep->ep.name,
+ ep->dwc_ep.is_in ? "IN" : "OUT",
+ DWC_DEPTSIZ_XFER_SIZ_RD(deptsiz),
+ DWC_DEPTSIZ_PKT_CNT_RD(deptsiz));
+ } else {
+ ulong out_ep_regs = dev_if->out_ep_regs[ep->dwc_ep.num];
+
+ deptsiz = dwc_read32(out_ep_regs + DWC_DOEPTSIZ);
+ is_last = 1;
+ }
+
+ /* Complete the request */
+ if (is_last) {
+ /*
+ * Added-sr: 2007-07-26
+ *
+ * Since the 405EZ (Ultra) only support 2047 bytes as
+ * max transfer size, we have to split up bigger transfers
+ * into multiple transfers of 1024 bytes sized messages.
+ * I happens often, that transfers of 4096 bytes are
+ * required (zero-gadget, file_storage-gadget).
+ */
+ if ((dwc_has_feature(core_if, DWC_LIMITED_XFER)) &&
+ ep->dwc_ep.bytes_pending) {
+ ulong in_regs =
+ core_if->dev_if->in_ep_regs[ep->dwc_ep.num];
+ u32 intr_mask = 0;
+
+ ep->dwc_ep.xfer_len = ep->dwc_ep.bytes_pending;
+ if (ep->dwc_ep.xfer_len > MAX_XFER_LEN) {
+ ep->dwc_ep.bytes_pending = ep->dwc_ep.xfer_len -
+ MAX_XFER_LEN;
+ ep->dwc_ep.xfer_len = MAX_XFER_LEN;
+ } else {
+ ep->dwc_ep.bytes_pending = 0;
+ }
+
+ /*
+ * Restart the current transfer with the next "chunk"
+ * of data.
+ */
+ ep->dwc_ep.xfer_count = 0;
+
+ deptsiz = dwc_read32(in_regs + DWC_DIEPTSIZ);
+ deptsiz =
+ DWC_DEPTSIZ_XFER_SIZ_RW(deptsiz,
+ ep->dwc_ep.xfer_len);
+ deptsiz =
+ DWC_DEPTSIZ_PKT_CNT_RW(deptsiz,
+ ((ep->dwc_ep.xfer_len - 1 +
+ ep->dwc_ep.maxpacket) /
+ ep->dwc_ep.maxpacket));
+ dwc_write32(in_regs + DWC_DIEPTSIZ, deptsiz);
+
+ intr_mask |= DWC_INTSTS_NP_TXFIFO_EMPT;
+ dwc_modify32((core_if->core_global_regs) +
+ DWC_GINTSTS, intr_mask, 0);
+ dwc_modify32((core_if->core_global_regs) +
+ DWC_GINTMSK, intr_mask, intr_mask);
+
+ /*
+ * Just return here if message was not completely
+ * transferred.
+ */
+ return;
+ }
+ if (core_if->dma_enable)
+ req->req.actual = ep->dwc_ep.xfer_len -
+ DWC_DEPTSIZ_XFER_SIZ_RD(deptsiz);
+ else
+ req->req.actual = ep->dwc_ep.xfer_count;
+
+ request_done(ep, req, 0);
+ ep->dwc_ep.start_xfer_buff = NULL;
+ ep->dwc_ep.xfer_buff = NULL;
+ ep->dwc_ep.xfer_len = 0;
+
+ /* If there is a request in the queue start it. */
+ start_next_request(ep);
+ }
+}
+
+/**
+ * This function continues control IN transfers started by
+ * dwc_otg_ep0_start_transfer, when the transfer does not fit in a
+ * single packet. NOTE: The DIEPCTL0/DOEPCTL0 registers only have one
+ * bit for the packet count.
+ */
+static void dwc_otg_ep0_continue_transfer(struct core_if *c_if,
+ struct dwc_ep *ep)
+{
+ if (ep->is_in) {
+ u32 depctl = 0;
+ u32 deptsiz = 0;
+ struct device_if *d_if = c_if->dev_if;
+ ulong in_regs = d_if->in_ep_regs[0];
+ u32 tx_status = 0;
+ ulong glbl_regs = c_if->core_global_regs;
+
+ tx_status = dwc_read32(glbl_regs + DWC_GNPTXSTS);
+
+ depctl = dwc_read32(in_regs + DWC_DIEPCTL);
+ deptsiz = dwc_read32(in_regs + DWC_DIEPTSIZ);
+
+ /*
+ * Program the transfer size and packet count as follows:
+ * xfersize = N * maxpacket + short_packet
+ * pktcnt = N + (short_packet exist ? 1 : 0)
+ */
+ if (ep->total_len - ep->xfer_count > ep->maxpacket)
+ deptsiz = DWC_DEPTSIZ0_XFER_SIZ_RW(deptsiz,
+ ep->maxpacket);
+ else
+ deptsiz = DWC_DEPTSIZ0_XFER_SIZ_RW(deptsiz,
+ (ep->total_len -
+ ep->xfer_count));
+
+ deptsiz = DWC_DEPTSIZ0_PKT_CNT_RW(deptsiz, 1);
+ ep->xfer_len += DWC_DEPTSIZ0_XFER_SIZ_RD(deptsiz);
+ dwc_write32(in_regs + DWC_DIEPTSIZ, deptsiz);
+
+ /* Write the DMA register */
+ if (DWC_HWCFG2_ARCH_RD(c_if->hwcfg2) == DWC_INT_DMA_ARCH)
+ dwc_write32(in_regs + DWC_DIEPDMA, ep->dma_addr);
+
+ /* EP enable, IN data in FIFO */
+ depctl = DWC_DEPCTL_CLR_NAK_RW(depctl, 1);
+ depctl = DWC_DEPCTL_EPENA_RW(depctl, 1);
+ dwc_write32(in_regs + DWC_DIEPCTL, depctl);
+
+ /*
+ * Enable the Non-Periodic Tx FIFO empty interrupt, the
+ * data will be written into the fifo by the ISR.
+ */
+ if (!c_if->dma_enable) {
+ u32 intr_mask = 0;
+
+ /* First clear it from GINTSTS */
+ intr_mask |= DWC_INTMSK_NP_TXFIFO_EMPT;
+ dwc_write32(glbl_regs + DWC_GINTSTS, intr_mask);
+
+ /* To avoid spurious NPTxFEmp intr */
+ dwc_modify32(glbl_regs + DWC_GINTMSK, intr_mask,
+ intr_mask);
+ }
+ }
+}
+
+/**
+ * This function handles EP0 Control transfers.
+ *
+ * The state of the control tranfers are tracked in ep0state
+ */
+static void handle_ep0(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct pcd_ep *ep0 = &pcd->ep0;
+
+ switch (pcd->ep0state) {
+ case EP0_DISCONNECT:
+ break;
+ case EP0_IDLE:
+ pcd->request_config = 0;
+ pcd_setup(pcd);
+ break;
+ case EP0_IN_DATA_PHASE:
+ if (core_if->dma_enable)
+ /*
+ * For EP0 we can only program 1 packet at a time so we
+ * need to do the calculations after each complete.
+ * Call write_packet to make the calculations, as in
+ * slave mode, and use those values to determine if we
+ * can complete.
+ */
+ dwc_otg_ep_write_packet(core_if, &ep0->dwc_ep, 1);
+ else
+ dwc_otg_ep_write_packet(core_if, &ep0->dwc_ep, 0);
+
+ if (ep0->dwc_ep.xfer_count < ep0->dwc_ep.total_len)
+ dwc_otg_ep0_continue_transfer(core_if, &ep0->dwc_ep);
+ else
+ ep0_complete_request(ep0);
+ break;
+ case EP0_OUT_DATA_PHASE:
+ ep0_complete_request(ep0);
+ break;
+ case EP0_STATUS:
+ ep0_complete_request(ep0);
+ pcd->ep0state = EP0_IDLE;
+ ep0->stopped = 1;
+ ep0->dwc_ep.is_in = 0; /* OUT for next SETUP */
+
+ /* Prepare for more SETUP Packets */
+ if (core_if->dma_enable) {
+ ep0_out_start(core_if, pcd);
+ } else {
+ int i;
+ u32 diepctl = 0;
+
+ diepctl = dwc_read32(in_ep_ctl_reg(pcd, 0));
+ if (pcd->ep0.queue_sof) {
+ pcd->ep0.queue_sof = 0;
+ start_next_request(&pcd->ep0);
+ }
+
+ diepctl = dwc_read32(in_ep_ctl_reg(pcd, 0));
+ if (pcd->ep0.queue_sof) {
+ pcd->ep0.queue_sof = 0;
+ start_next_request(&pcd->ep0);
+ }
+
+ for (i = 0; i < core_if->dev_if->num_in_eps; i++) {
+ diepctl = dwc_read32(in_ep_ctl_reg(pcd, i));
+
+ if (pcd->in_ep[i].queue_sof) {
+ pcd->in_ep[i].queue_sof = 0;
+ start_next_request(&pcd->in_ep[i]);
+ }
+ }
+ }
+ break;
+ case EP0_STALL:
+ pr_err("EP0 STALLed, should not get here handle_ep0()\n");
+ break;
+ }
+}
+
+/**
+ * Restart transfer
+ */
+static void restart_transfer(struct dwc_pcd *pcd, const u32 ep_num)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ u32 dieptsiz = 0;
+ struct pcd_ep *ep;
+
+ dieptsiz = dwc_read32(dev_if->in_ep_regs[ep_num] + DWC_DIEPTSIZ);
+ ep = get_in_ep(pcd, ep_num);
+
+ /*
+ * If pktcnt is not 0, and xfersize is 0, and there is a buffer,
+ * resend the last packet.
+ */
+ if (DWC_DEPTSIZ_PKT_CNT_RD(dieptsiz) &&
+ !DWC_DEPTSIZ_XFER_SIZ_RD(dieptsiz) && ep->dwc_ep.start_xfer_buff) {
+ if (ep->dwc_ep.xfer_len <= ep->dwc_ep.maxpacket) {
+ ep->dwc_ep.xfer_count = 0;
+ ep->dwc_ep.xfer_buff = ep->dwc_ep.start_xfer_buff;
+ } else {
+ ep->dwc_ep.xfer_count -= ep->dwc_ep.maxpacket;
+
+ /* convert packet size to dwords. */
+ ep->dwc_ep.xfer_buff -= ep->dwc_ep.maxpacket;
+ }
+ ep->stopped = 0;
+
+ if (!ep_num)
+ dwc_otg_ep0_start_transfer(core_if, &ep->dwc_ep);
+ else
+ dwc_otg_ep_start_transfer(core_if, &ep->dwc_ep);
+ }
+}
+
+/**
+ * Handle the IN EP Transfer Complete interrupt.
+ *
+ * If dedicated fifos are enabled, then the Tx FIFO empty interrupt for the EP
+ * is disabled. Otherwise the NP Tx FIFO empty interrupt is disabled.
+ */
+static void handle_in_ep_xfr_complete_intr(struct dwc_pcd *pcd,
+ struct pcd_ep *ep, u32 num)
+{
+ struct core_if *c_if = GET_CORE_IF(pcd);
+ struct device_if *d_if = c_if->dev_if;
+ struct dwc_ep *dwc_ep = &ep->dwc_ep;
+ u32 diepint = 0;
+
+ if (c_if->en_multiple_tx_fifo) {
+ u32 fifoemptymsk = 0x1 << dwc_ep->num;
+ dwc_modify32(d_if->dev_global_regs +
+ DWC_DTKNQR4FIFOEMPTYMSK, fifoemptymsk, 0);
+ } else {
+ u32 intr_mask = 0;
+
+ intr_mask |= DWC_INTMSK_NP_TXFIFO_EMPT;
+ dwc_modify32((c_if->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+ }
+
+ /* Clear the interrupt, then complete the transfer */
+ diepint = DWC_DIEPINT_TX_CMPL_RW(diepint, 1);
+ dwc_write32(d_if->in_ep_regs[num] + DWC_DIEPINT, diepint);
+
+ if (!num)
+ handle_ep0(pcd);
+ else
+ complete_ep(ep);
+}
+
+/**
+ * Handle the IN EP disable interrupt.
+ */
+static void handle_in_ep_disable_intr(struct dwc_pcd *pcd, const u32 ep_num)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct device_if *dev_if = core_if->dev_if;
+ u32 dieptsiz = 0;
+ u32 dctl = 0;
+ struct pcd_ep *ep;
+ struct dwc_ep *dwc_ep;
+ u32 diepint = 0;
+
+ ep = get_in_ep(pcd, ep_num);
+ dwc_ep = &ep->dwc_ep;
+
+ dieptsiz = dwc_read32(dev_if->in_ep_regs[ep_num] + DWC_DIEPTSIZ);
+
+ if (ep->stopped) {
+ /* Flush the Tx FIFO */
+ dwc_otg_flush_tx_fifo(core_if, dwc_ep->tx_fifo_num);
+
+ /* Clear the Global IN NP NAK */
+ dctl = 0;
+ dctl = DWC_DCTL_CLR_CLBL_NP_IN_NAK(dctl, 1);
+ dwc_modify32(dev_ctl_reg(pcd), dctl, 0);
+
+ if (DWC_DEPTSIZ_PKT_CNT_RD(dieptsiz) ||
+ DWC_DEPTSIZ_XFER_SIZ_RD(dieptsiz))
+ restart_transfer(pcd, ep_num);
+ } else {
+ if (DWC_DEPTSIZ_PKT_CNT_RD(dieptsiz) ||
+ DWC_DEPTSIZ_XFER_SIZ_RD(dieptsiz))
+ restart_transfer(pcd, ep_num);
+ }
+ /* Clear epdisabled */
+ diepint = DWC_DIEPINT_EP_DISA_RW(diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, ep_num), diepint);
+
+}
+
+/**
+ * Handler for the IN EP timeout handshake interrupt.
+ */
+static void handle_in_ep_timeout_intr(struct dwc_pcd *pcd, const u32 ep_num)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ struct pcd_ep *ep;
+ u32 dctl = 0;
+ u32 intr_mask = 0;
+ u32 diepint = 0;
+
+ ep = get_in_ep(pcd, ep_num);
+
+ /* Disable the NP Tx Fifo Empty Interrrupt */
+ if (!core_if->dma_enable) {
+ intr_mask |= DWC_INTMSK_NP_TXFIFO_EMPT;
+ dwc_modify32((core_if->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+ }
+
+ /* Non-periodic EP */
+ /* Enable the Global IN NAK Effective Interrupt */
+ intr_mask |= DWC_INTMSK_GLBL_IN_NAK;
+ dwc_modify32((core_if->core_global_regs) + DWC_GINTMSK, 0,
+ intr_mask);
+
+ /* Set Global IN NAK */
+ dctl = DWC_DCTL_CLR_CLBL_NP_IN_NAK(dctl, 1);
+ dwc_modify32(dev_ctl_reg(pcd), dctl, dctl);
+ ep->stopped = 1;
+
+ /* Clear timeout */
+ diepint = DWC_DIEPINT_TOUT_COND_RW(diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, ep_num), diepint);
+}
+
+/**
+ * Handles the IN Token received with TxF Empty interrupt.
+ *
+ * For the 405EZ, only start the next transfer, when currently no other transfer
+ * is active on this endpoint.
+ *
+ * Note that the bits in the Device IN endpoint mask register are laid out
+ * exactly the same as the Device IN endpoint interrupt register.
+ */
+static void handle_in_ep_tx_fifo_empty_intr(struct dwc_pcd *pcd,
+ struct pcd_ep *ep, u32 num)
+{
+ u32 diepint = 0;
+
+ if (!ep->stopped && num) {
+ u32 diepmsk = 0;
+
+ diepmsk = DWC_DIEPMSK_IN_TKN_TX_EMPTY_RW(diepmsk, 1);
+ dwc_modify32(dev_diepmsk_reg(pcd), diepmsk, 0);
+
+ if (dwc_has_feature(GET_CORE_IF(pcd), DWC_LIMITED_XFER)) {
+ if (!ep->dwc_ep.active)
+ start_next_request(ep);
+ } else {
+ start_next_request(ep);
+ }
+ }
+ /* Clear intktxfemp */
+ diepint = DWC_DIEPMSK_IN_TKN_TX_EMPTY_RW(diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, num), diepint);
+}
+
+static void handle_in_ep_nak_effective_intr(struct dwc_pcd *pcd,
+ struct pcd_ep *ep, u32 num)
+{
+ u32 diepctl = 0;
+ u32 diepint = 0;
+
+ /* Periodic EP */
+ if (ep->disabling) {
+ diepctl = 0;
+ diepctl = DWC_DEPCTL_SET_NAK_RW(diepctl, 1);
+ diepctl = DWC_DEPCTL_DPID_RW(diepctl, 1);
+ dwc_modify32(in_ep_ctl_reg(pcd, num), diepctl, diepctl);
+ }
+ /* Clear inepnakeff */
+ diepint = DWC_DIEPINT_IN_EP_NAK_RW(diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, num), diepint);
+
+}
+
+/**
+ * This function returns the Device IN EP Interrupt register
+ */
+static inline u32 dwc_otg_read_diep_intr(struct core_if *core_if,
+ struct dwc_ep *ep)
+{
+ struct device_if *dev_if = core_if->dev_if;
+ u32 v, msk, emp;
+
+ msk = dwc_read32(dev_if->dev_global_regs + DWC_DIEPMSK);
+ emp =
+ dwc_read32(dev_if->dev_global_regs + DWC_DTKNQR4FIFOEMPTYMSK);
+ msk |= ((emp >> ep->num) & 0x1) << 7;
+ v = dwc_read32(dev_if->in_ep_regs[ep->num] + DWC_DIEPINT) & msk;
+ return v;
+}
+
+/**
+ * This function reads the Device All Endpoints Interrupt register and
+ * returns the IN endpoint interrupt bits.
+ */
+static inline u32 dwc_otg_read_dev_all_in_ep_intr(struct core_if *_if)
+{
+ u32 v;
+
+ v = dwc_read32(_if->dev_if->dev_global_regs + DWC_DAINT) &
+ dwc_read32(_if->dev_if->dev_global_regs + DWC_DAINTMSK);
+ return v & 0xffff;
+}
+
+/**
+ * This interrupt indicates that an IN EP has a pending Interrupt.
+ * The sequence for handling the IN EP interrupt is shown below:
+ *
+ * - Read the Device All Endpoint Interrupt register
+ * - Repeat the following for each IN EP interrupt bit set (from LSB to MSB).
+ *
+ * - Read the Device Endpoint Interrupt (DIEPINTn) register
+ * - If "Transfer Complete" call the request complete function
+ * - If "Endpoint Disabled" complete the EP disable procedure.
+ * - If "AHB Error Interrupt" log error
+ * - If "Time-out Handshake" log error
+ * - If "IN Token Received when TxFIFO Empty" write packet to Tx FIFO.
+ * - If "IN Token EP Mismatch" (disable, this is handled by EP Mismatch
+ * Interrupt)
+ */
+static int dwc_otg_pcd_handle_in_ep_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ u32 diepint = 0;
+ u32 ep_intr;
+ u32 epnum = 0;
+ struct pcd_ep *ep;
+ struct dwc_ep *dwc_ep;
+
+ /* Read in the device interrupt bits */
+ ep_intr = dwc_otg_read_dev_all_in_ep_intr(core_if);
+
+ /* Service the Device IN interrupts for each endpoint */
+ while (ep_intr) {
+ if (ep_intr & 0x1) {
+ u32 c_diepint;
+
+ /* Get EP pointer */
+ ep = get_in_ep(pcd, epnum);
+ dwc_ep = &ep->dwc_ep;
+
+ diepint = dwc_otg_read_diep_intr(core_if, dwc_ep);
+
+ /* Transfer complete */
+ if (DWC_DIEPINT_TX_CMPL_RD(diepint))
+ handle_in_ep_xfr_complete_intr(pcd, ep, epnum);
+
+ /* Endpoint disable */
+ if (DWC_DIEPINT_EP_DISA_RD(diepint))
+ handle_in_ep_disable_intr(pcd, epnum);
+
+ /* AHB Error */
+ if (DWC_DIEPINT_AHB_ERROR_RD(diepint)) {
+ /* Clear ahberr */
+ c_diepint = 0;
+ c_diepint =
+ DWC_DIEPINT_AHB_ERROR_RW(c_diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, epnum),
+ c_diepint);
+ }
+
+ /* TimeOUT Handshake (non-ISOC IN EPs) */
+ if (DWC_DIEPINT_TOUT_COND_RD(diepint))
+ handle_in_ep_timeout_intr(pcd, epnum);
+
+ /* IN Token received with TxF Empty */
+ if (DWC_DIEPINT_IN_TKN_TX_EMPTY_RD(diepint))
+ handle_in_ep_tx_fifo_empty_intr(pcd, ep, epnum);
+
+ /* IN Token Received with EP mismatch */
+ if (DWC_DIEPINT_IN_TKN_EP_MISS_RD(diepint)) {
+ /* Clear intknepmis */
+ c_diepint = 0;
+ c_diepint =
+ DWC_DIEPINT_IN_TKN_EP_MISS_RW(c_diepint, 1);
+ dwc_write32(in_ep_int_reg(pcd, epnum),
+ c_diepint);
+ }
+
+ /* IN Endpoint NAK Effective */
+ if (DWC_DIEPINT_IN_EP_NAK_RD(diepint))
+ handle_in_ep_nak_effective_intr(pcd, ep, epnum);
+
+ /* IN EP Tx FIFO Empty Intr */
+ if (DWC_DIEPINT_TXFIFO_EMPTY_RD(diepint))
+ write_empty_tx_fifo(pcd, epnum);
+ }
+ epnum++;
+ ep_intr >>= 1;
+ }
+ return 1;
+}
+
+/**
+ * This function reads the Device All Endpoints Interrupt register and
+ * returns the OUT endpoint interrupt bits.
+ */
+static inline u32 dwc_otg_read_dev_all_out_ep_intr(struct core_if *_if)
+{
+ u32 v;
+
+ v = dwc_read32(_if->dev_if->dev_global_regs + DWC_DAINT) &
+ dwc_read32(_if->dev_if->dev_global_regs + DWC_DAINTMSK);
+ return (v & 0xffff0000) >> 16;
+}
+
+/**
+ * This function returns the Device OUT EP Interrupt register
+ */
+static inline u32 dwc_otg_read_doep_intr(struct core_if *core_if,
+ struct dwc_ep *ep)
+{
+ struct device_if *dev_if = core_if->dev_if;
+ u32 v;
+
+ v = dwc_read32(dev_if->out_ep_regs[ep->num] + DWC_DOEPINT) &
+ dwc_read32(dev_if->dev_global_regs + DWC_DOEPMSK);
+ return v;
+}
+
+/**
+ * This interrupt indicates that an OUT EP has a pending Interrupt.
+ * The sequence for handling the OUT EP interrupt is shown below:
+ *
+ * - Read the Device All Endpoint Interrupt register.
+ * - Repeat the following for each OUT EP interrupt bit set (from LSB to MSB).
+ *
+ * - Read the Device Endpoint Interrupt (DOEPINTn) register
+ * - If "Transfer Complete" call the request complete function
+ * - If "Endpoint Disabled" complete the EP disable procedure.
+ * - If "AHB Error Interrupt" log error
+ * - If "Setup Phase Done" process Setup Packet (See Standard USB Command
+ * Processing)
+ */
+static int dwc_otg_pcd_handle_out_ep_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ u32 ep_intr;
+ u32 doepint = 0;
+ u32 epnum = 0;
+ struct dwc_ep *dwc_ep;
+
+ /* Read in the device interrupt bits */
+ ep_intr = dwc_otg_read_dev_all_out_ep_intr(core_if);
+ while (ep_intr) {
+ if (ep_intr & 0x1) {
+ u32 c_doepint = 0;
+
+ dwc_ep = &((get_out_ep(pcd, epnum))->dwc_ep);
+ doepint = dwc_otg_read_doep_intr(core_if, dwc_ep);
+
+ /* Transfer complete */
+ if (DWC_DOEPINT_TX_COMPL_RD(doepint)) {
+ /* Clear xfercompl */
+ c_doepint = 0;
+ c_doepint =
+ DWC_DOEPMSK_TX_COMPL_RW(c_doepint, 1);
+ dwc_write32(out_ep_int_reg(pcd, epnum),
+ c_doepint);
+ if (epnum == 0)
+ handle_ep0(pcd);
+ else
+ complete_ep(get_out_ep(pcd, epnum));
+ }
+
+ /* Endpoint disable */
+ if (DWC_DOEPINT_EP_DISA_RD(doepint)) {
+ /* Clear epdisabled */
+ c_doepint = 0;
+ c_doepint =
+ DWC_DOEPMSK_EP_DISA_RW(c_doepint, 1);
+ dwc_write32(out_ep_int_reg(pcd, epnum),
+ c_doepint);
+ }
+
+ /* AHB Error */
+ if (DWC_DOEPINT_AHB_ERROR_RD(doepint)) {
+ c_doepint = 0;
+ c_doepint =
+ DWC_DOEPMSK_AHB_ERROR_RW(c_doepint, 1);
+ dwc_write32(out_ep_int_reg(pcd, epnum),
+ c_doepint);
+ }
+
+ /* Setup Phase Done (control EPs) */
+ if (DWC_DOEPINT_SETUP_DONE_RD(doepint)) {
+ c_doepint = 0;
+ c_doepint =
+ DWC_DOEPMSK_SETUP_DONE_RW(c_doepint, 1);
+ dwc_write32(out_ep_int_reg(pcd, epnum),
+ c_doepint);
+ handle_ep0(pcd);
+ }
+ }
+ epnum++;
+ ep_intr >>= 1;
+ }
+ return 1;
+}
+
+/**
+ * Incomplete ISO IN Transfer Interrupt. This interrupt indicates one of the
+ * following conditions occurred while transmitting an ISOC transaction.
+ *
+ * - Corrupted IN Token for ISOC EP.
+ * - Packet not complete in FIFO.
+ *
+ * The follow actions should be taken:
+ * - Determine the EP
+ * - Set incomplete flag in dwc_ep structure
+ * - Disable EP. When "Endpoint Disabled" interrupt is received Flush FIFO
+ */
+static int dwc_otg_pcd_handle_incomplete_isoc_in_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts = 0;
+
+ pr_info("Interrupt handler not implemented for IN ISOC "
+ "Incomplete\n");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_INCMP_IN_ATX;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts |= DWC_INTSTS_INCMP_IN_ATX;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+ return 1;
+}
+
+/**
+ * Incomplete ISO OUT Transfer Interrupt. This interrupt indicates that the
+ * core has dropped an ISO OUT packet. The following conditions can be the
+ * cause:
+ *
+ * - FIFO Full, the entire packet would not fit in the FIFO.
+ * - CRC Error
+ * - Corrupted Token
+ *
+ * The follow actions should be taken:
+ * - Determine the EP
+ * - Set incomplete flag in dwc_ep structure
+ * - Read any data from the FIFO
+ * - Disable EP. When "Endpoint Disabled" interrupt is received re-enable EP.
+ */
+static int dwc_otg_pcd_handle_incomplete_isoc_out_intr(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts = 0;
+
+ pr_info("Interrupt handler not implemented for OUT ISOC "
+ "Incomplete\n");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_INCMP_OUT_PTX;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ gintsts |= DWC_INTSTS_INCMP_OUT_PTX;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+ return 1;
+}
+
+/**
+ * This function handles the Global IN NAK Effective interrupt.
+ */
+static int dwc_otg_pcd_handle_in_nak_effective(struct dwc_pcd *pcd)
+{
+ struct device_if *dev_if = GET_CORE_IF(pcd)->dev_if;
+ u32 diepctl = 0;
+ u32 diepctl_rd = 0;
+ u32 intr_mask = 0;
+ u32 gintsts = 0;
+ u32 i;
+
+ /* Disable all active IN EPs */
+ diepctl = DWC_DEPCTL_DPID_RW(diepctl, 1);
+ diepctl = DWC_DEPCTL_SET_NAK_RW(diepctl, 1);
+ for (i = 0; i <= dev_if->num_in_eps; i++) {
+ diepctl_rd = dwc_read32(in_ep_ctl_reg(pcd, i));
+ if (DWC_DEPCTL_EPENA_RD(diepctl_rd))
+ dwc_write32(in_ep_ctl_reg(pcd, i), diepctl);
+ }
+
+ /* Disable the Global IN NAK Effective Interrupt */
+ intr_mask |= DWC_INTMSK_GLBL_IN_NAK;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ /* Clear interrupt */
+ gintsts |= DWC_INTSTS_GLBL_IN_NAK;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+ return 1;
+}
+
+/**
+ * This function handles the Global OUT NAK Effective interrupt.
+ */
+static int dwc_otg_pcd_handle_out_nak_effective(struct dwc_pcd *pcd)
+{
+ u32 intr_mask = 0;
+ u32 gintsts = 0;
+
+ pr_info("Interrupt handler not implemented for Global IN "
+ "NAK Effective\n");
+
+ /* Turn off and clear the interrupt */
+ intr_mask |= DWC_INTMSK_GLBL_OUT_NAK;
+ dwc_modify32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTMSK,
+ intr_mask, 0);
+
+ /* Clear goutnakeff */
+ gintsts |= DWC_INTSTS_GLBL_OUT_NAK;
+ dwc_write32((GET_CORE_IF(pcd)->core_global_regs) + DWC_GINTSTS,
+ gintsts);
+ return 1;
+}
+
+/**
+ * PCD interrupt handler.
+ *
+ * The PCD handles the device interrupts. Many conditions can cause a
+ * device interrupt. When an interrupt occurs, the device interrupt
+ * service routine determines the cause of the interrupt and
+ * dispatches handling to the appropriate function. These interrupt
+ * handling functions are described below.
+ *
+ * All interrupt registers are processed from LSB to MSB.
+ *
+ */
+int dwc_otg_pcd_handle_intr(struct dwc_pcd *pcd)
+{
+ struct core_if *core_if = GET_CORE_IF(pcd);
+ u32 gintr_status;
+ int ret = 0;
+
+ if (dwc_otg_is_device_mode(core_if)) {
+ spin_lock(&pcd->lock);
+
+ gintr_status = dwc_otg_read_core_intr(core_if);
+ if (!gintr_status) {
+ spin_unlock(&pcd->lock);
+ return 0;
+ }
+
+ if (gintr_status & DWC_INTSTS_STRT_OF_FRM)
+ ret |= dwc_otg_pcd_handle_sof_intr(pcd);
+ if (gintr_status & DWC_INTSTS_RXFIFO_NOT_EMPT)
+ ret |= dwc_otg_pcd_handle_rx_status_q_level_intr(pcd);
+ if (gintr_status & DWC_INTSTS_NP_TXFIFO_EMPT)
+ ret |= dwc_otg_pcd_handle_np_tx_fifo_empty_intr(pcd);
+ if (gintr_status & DWC_INTSTS_GLBL_IN_NAK)
+ ret |= dwc_otg_pcd_handle_in_nak_effective(pcd);
+ if (gintr_status & DWC_INTSTS_GLBL_OUT_NAK)
+ ret |= dwc_otg_pcd_handle_out_nak_effective(pcd);
+ if (gintr_status & DWC_INTSTS_I2C_INTR)
+ ret |= dwc_otg_pcd_handle_i2c_intr(pcd);
+ if (gintr_status & DWC_INTSTS_EARLY_SUSP)
+ ret |= dwc_otg_pcd_handle_early_suspend_intr(pcd);
+ if (gintr_status & DWC_INTSTS_USB_RST)
+ ret |= dwc_otg_pcd_handle_usb_reset_intr(pcd);
+ if (gintr_status & DWC_INTSTS_ENUM_DONE)
+ ret |= dwc_otg_pcd_handle_enum_done_intr(pcd);
+ if (gintr_status & DWC_INTSTS_ISYNC_OUTPKT_DRP)
+ ret |=
+ dwc_otg_pcd_handle_isoc_out_packet_dropped_intr
+ (pcd);
+ if (gintr_status & DWC_INTSTS_END_OF_PFRM)
+ ret |= dwc_otg_pcd_handle_end_periodic_frame_intr(pcd);
+ if (gintr_status & DWC_INTSTS_ENDP_MIS_MTCH)
+ ret |= dwc_otg_pcd_handle_ep_mismatch_intr(core_if);
+ if (gintr_status & DWC_INTSTS_IN_ENDP)
+ ret |= dwc_otg_pcd_handle_in_ep_intr(pcd);
+ if (gintr_status & DWC_INTSTS_OUT_ENDP)
+ ret |= dwc_otg_pcd_handle_out_ep_intr(pcd);
+ if (gintr_status & DWC_INTSTS_INCMP_IN_ATX)
+ ret |= dwc_otg_pcd_handle_incomplete_isoc_in_intr(pcd);
+ if (gintr_status & DWC_INTSTS_INCMP_OUT_PTX)
+ ret |= dwc_otg_pcd_handle_incomplete_isoc_out_intr(pcd);
+
+ spin_unlock(&pcd->lock);
+ }
+ return ret;
+}
--
1.6.1.rc3
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