diff options
Diffstat (limited to 'drivers/usb/gadget/udc/omap_udc.c')
| -rw-r--r-- | drivers/usb/gadget/udc/omap_udc.c | 3012 |
1 files changed, 3012 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/omap_udc.c b/drivers/usb/gadget/udc/omap_udc.c new file mode 100644 index 000000000..494da0039 --- /dev/null +++ b/drivers/usb/gadget/udc/omap_udc.c @@ -0,0 +1,3012 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * omap_udc.c -- for OMAP full speed udc; most chips support OTG. + * + * Copyright (C) 2004 Texas Instruments, Inc. + * Copyright (C) 2004-2005 David Brownell + * + * OMAP2 & DMA support by Kyungmin Park <kyungmin.park@samsung.com> + */ + +#undef DEBUG +#undef VERBOSE + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/mm.h> +#include <linux/moduleparam.h> +#include <linux/platform_device.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/usb/otg.h> +#include <linux/dma-mapping.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/prefetch.h> +#include <linux/io.h> + +#include <asm/byteorder.h> +#include <asm/irq.h> +#include <asm/unaligned.h> +#include <asm/mach-types.h> + +#include <linux/omap-dma.h> + +#include <mach/usb.h> + +#include "omap_udc.h" + +#undef USB_TRACE + +/* bulk DMA seems to be behaving for both IN and OUT */ +#define USE_DMA + +/* ISO too */ +#define USE_ISO + +#define DRIVER_DESC "OMAP UDC driver" +#define DRIVER_VERSION "4 October 2004" + +#define OMAP_DMA_USB_W2FC_TX0 29 +#define OMAP_DMA_USB_W2FC_RX0 26 + +/* + * The OMAP UDC needs _very_ early endpoint setup: before enabling the + * D+ pullup to allow enumeration. That's too early for the gadget + * framework to use from usb_endpoint_enable(), which happens after + * enumeration as part of activating an interface. (But if we add an + * optional new "UDC not yet running" state to the gadget driver model, + * even just during driver binding, the endpoint autoconfig logic is the + * natural spot to manufacture new endpoints.) + * + * So instead of using endpoint enable calls to control the hardware setup, + * this driver defines a "fifo mode" parameter. It's used during driver + * initialization to choose among a set of pre-defined endpoint configs. + * See omap_udc_setup() for available modes, or to add others. That code + * lives in an init section, so use this driver as a module if you need + * to change the fifo mode after the kernel boots. + * + * Gadget drivers normally ignore endpoints they don't care about, and + * won't include them in configuration descriptors. That means only + * misbehaving hosts would even notice they exist. + */ +#ifdef USE_ISO +static unsigned fifo_mode = 3; +#else +static unsigned fifo_mode; +#endif + +/* "modprobe omap_udc fifo_mode=42", or else as a kernel + * boot parameter "omap_udc:fifo_mode=42" + */ +module_param(fifo_mode, uint, 0); +MODULE_PARM_DESC(fifo_mode, "endpoint configuration"); + +#ifdef USE_DMA +static bool use_dma = 1; + +/* "modprobe omap_udc use_dma=y", or else as a kernel + * boot parameter "omap_udc:use_dma=y" + */ +module_param(use_dma, bool, 0); +MODULE_PARM_DESC(use_dma, "enable/disable DMA"); +#else /* !USE_DMA */ + +/* save a bit of code */ +#define use_dma 0 +#endif /* !USE_DMA */ + + +static const char driver_name[] = "omap_udc"; +static const char driver_desc[] = DRIVER_DESC; + +/*-------------------------------------------------------------------------*/ + +/* there's a notion of "current endpoint" for modifying endpoint + * state, and PIO access to its FIFO. + */ + +static void use_ep(struct omap_ep *ep, u16 select) +{ + u16 num = ep->bEndpointAddress & 0x0f; + + if (ep->bEndpointAddress & USB_DIR_IN) + num |= UDC_EP_DIR; + omap_writew(num | select, UDC_EP_NUM); + /* when select, MUST deselect later !! */ +} + +static inline void deselect_ep(void) +{ + u16 w; + + w = omap_readw(UDC_EP_NUM); + w &= ~UDC_EP_SEL; + omap_writew(w, UDC_EP_NUM); + /* 6 wait states before TX will happen */ +} + +static void dma_channel_claim(struct omap_ep *ep, unsigned preferred); + +/*-------------------------------------------------------------------------*/ + +static int omap_ep_enable(struct usb_ep *_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); + struct omap_udc *udc; + unsigned long flags; + u16 maxp; + + /* catch various bogus parameters */ + if (!_ep || !desc + || desc->bDescriptorType != USB_DT_ENDPOINT + || ep->bEndpointAddress != desc->bEndpointAddress + || ep->maxpacket < usb_endpoint_maxp(desc)) { + DBG("%s, bad ep or descriptor\n", __func__); + return -EINVAL; + } + maxp = usb_endpoint_maxp(desc); + if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK + && maxp != ep->maxpacket) + || usb_endpoint_maxp(desc) > ep->maxpacket + || !desc->wMaxPacketSize) { + DBG("%s, bad %s maxpacket\n", __func__, _ep->name); + return -ERANGE; + } + +#ifdef USE_ISO + if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC + && desc->bInterval != 1)) { + /* hardware wants period = 1; USB allows 2^(Interval-1) */ + DBG("%s, unsupported ISO period %dms\n", _ep->name, + 1 << (desc->bInterval - 1)); + return -EDOM; + } +#else + if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + DBG("%s, ISO nyet\n", _ep->name); + return -EDOM; + } +#endif + + /* xfer types must match, except that interrupt ~= bulk */ + if (ep->bmAttributes != desc->bmAttributes + && ep->bmAttributes != USB_ENDPOINT_XFER_BULK + && desc->bmAttributes != USB_ENDPOINT_XFER_INT) { + DBG("%s, %s type mismatch\n", __func__, _ep->name); + return -EINVAL; + } + + udc = ep->udc; + if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { + DBG("%s, bogus device state\n", __func__); + return -ESHUTDOWN; + } + + spin_lock_irqsave(&udc->lock, flags); + + ep->ep.desc = desc; + ep->irqs = 0; + ep->stopped = 0; + ep->ep.maxpacket = maxp; + + /* set endpoint to initial state */ + ep->dma_channel = 0; + ep->has_dma = 0; + ep->lch = -1; + use_ep(ep, UDC_EP_SEL); + omap_writew(udc->clr_halt, UDC_CTRL); + ep->ackwait = 0; + deselect_ep(); + + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) + list_add(&ep->iso, &udc->iso); + + /* maybe assign a DMA channel to this endpoint */ + if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK) + /* FIXME ISO can dma, but prefers first channel */ + dma_channel_claim(ep, 0); + + /* PIO OUT may RX packets */ + if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC + && !ep->has_dma + && !(ep->bEndpointAddress & USB_DIR_IN)) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + + spin_unlock_irqrestore(&udc->lock, flags); + VDBG("%s enabled\n", _ep->name); + return 0; +} + +static void nuke(struct omap_ep *, int status); + +static int omap_ep_disable(struct usb_ep *_ep) +{ + struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); + unsigned long flags; + + if (!_ep || !ep->ep.desc) { + DBG("%s, %s not enabled\n", __func__, + _ep ? ep->ep.name : NULL); + return -EINVAL; + } + + spin_lock_irqsave(&ep->udc->lock, flags); + ep->ep.desc = NULL; + nuke(ep, -ESHUTDOWN); + ep->ep.maxpacket = ep->maxpacket; + ep->has_dma = 0; + omap_writew(UDC_SET_HALT, UDC_CTRL); + list_del_init(&ep->iso); + del_timer(&ep->timer); + + spin_unlock_irqrestore(&ep->udc->lock, flags); + + VDBG("%s disabled\n", _ep->name); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static struct usb_request * +omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) +{ + struct omap_req *req; + + req = kzalloc(sizeof(*req), gfp_flags); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + + return &req->req; +} + +static void +omap_free_request(struct usb_ep *ep, struct usb_request *_req) +{ + struct omap_req *req = container_of(_req, struct omap_req, req); + + kfree(req); +} + +/*-------------------------------------------------------------------------*/ + +static void +done(struct omap_ep *ep, struct omap_req *req, int status) +{ + struct omap_udc *udc = ep->udc; + unsigned stopped = ep->stopped; + + list_del_init(&req->queue); + + if (req->req.status == -EINPROGRESS) + req->req.status = status; + else + status = req->req.status; + + if (use_dma && ep->has_dma) + usb_gadget_unmap_request(&udc->gadget, &req->req, + (ep->bEndpointAddress & USB_DIR_IN)); + +#ifndef USB_TRACE + if (status && status != -ESHUTDOWN) +#endif + VDBG("complete %s req %p stat %d len %u/%u\n", + ep->ep.name, &req->req, status, + req->req.actual, req->req.length); + + /* don't modify queue heads during completion callback */ + ep->stopped = 1; + spin_unlock(&ep->udc->lock); + usb_gadget_giveback_request(&ep->ep, &req->req); + spin_lock(&ep->udc->lock); + ep->stopped = stopped; +} + +/*-------------------------------------------------------------------------*/ + +#define UDC_FIFO_FULL (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL) +#define UDC_FIFO_UNWRITABLE (UDC_EP_HALTED | UDC_FIFO_FULL) + +#define FIFO_EMPTY (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY) +#define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY) + +static inline int +write_packet(u8 *buf, struct omap_req *req, unsigned max) +{ + unsigned len; + u16 *wp; + + len = min(req->req.length - req->req.actual, max); + req->req.actual += len; + + max = len; + if (likely((((int)buf) & 1) == 0)) { + wp = (u16 *)buf; + while (max >= 2) { + omap_writew(*wp++, UDC_DATA); + max -= 2; + } + buf = (u8 *)wp; + } + while (max--) + omap_writeb(*buf++, UDC_DATA); + return len; +} + +/* FIXME change r/w fifo calling convention */ + + +/* return: 0 = still running, 1 = completed, negative = errno */ +static int write_fifo(struct omap_ep *ep, struct omap_req *req) +{ + u8 *buf; + unsigned count; + int is_last; + u16 ep_stat; + + buf = req->req.buf + req->req.actual; + prefetch(buf); + + /* PIO-IN isn't double buffered except for iso */ + ep_stat = omap_readw(UDC_STAT_FLG); + if (ep_stat & UDC_FIFO_UNWRITABLE) + return 0; + + count = ep->ep.maxpacket; + count = write_packet(buf, req, count); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1; + + /* last packet is often short (sometimes a zlp) */ + if (count != ep->ep.maxpacket) + is_last = 1; + else if (req->req.length == req->req.actual + && !req->req.zero) + is_last = 1; + else + is_last = 0; + + /* NOTE: requests complete when all IN data is in a + * FIFO (or sometimes later, if a zlp was needed). + * Use usb_ep_fifo_status() where needed. + */ + if (is_last) + done(ep, req, 0); + return is_last; +} + +static inline int +read_packet(u8 *buf, struct omap_req *req, unsigned avail) +{ + unsigned len; + u16 *wp; + + len = min(req->req.length - req->req.actual, avail); + req->req.actual += len; + avail = len; + + if (likely((((int)buf) & 1) == 0)) { + wp = (u16 *)buf; + while (avail >= 2) { + *wp++ = omap_readw(UDC_DATA); + avail -= 2; + } + buf = (u8 *)wp; + } + while (avail--) + *buf++ = omap_readb(UDC_DATA); + return len; +} + +/* return: 0 = still running, 1 = queue empty, negative = errno */ +static int read_fifo(struct omap_ep *ep, struct omap_req *req) +{ + u8 *buf; + unsigned count, avail; + int is_last; + + buf = req->req.buf + req->req.actual; + prefetchw(buf); + + for (;;) { + u16 ep_stat = omap_readw(UDC_STAT_FLG); + + is_last = 0; + if (ep_stat & FIFO_EMPTY) { + if (!ep->double_buf) + break; + ep->fnf = 1; + } + if (ep_stat & UDC_EP_HALTED) + break; + + if (ep_stat & UDC_FIFO_FULL) + avail = ep->ep.maxpacket; + else { + avail = omap_readw(UDC_RXFSTAT); + ep->fnf = ep->double_buf; + } + count = read_packet(buf, req, avail); + + /* partial packet reads may not be errors */ + if (count < ep->ep.maxpacket) { + is_last = 1; + /* overflowed this request? flush extra data */ + if (count != avail) { + req->req.status = -EOVERFLOW; + avail -= count; + while (avail--) + omap_readw(UDC_DATA); + } + } else if (req->req.length == req->req.actual) + is_last = 1; + else + is_last = 0; + + if (!ep->bEndpointAddress) + break; + if (is_last) + done(ep, req, 0); + break; + } + return is_last; +} + +/*-------------------------------------------------------------------------*/ + +static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start) +{ + dma_addr_t end; + + /* IN-DMA needs this on fault/cancel paths, so 15xx misreports + * the last transfer's bytecount by more than a FIFO's worth. + */ + if (cpu_is_omap15xx()) + return 0; + + end = omap_get_dma_src_pos(ep->lch); + if (end == ep->dma_counter) + return 0; + + end |= start & (0xffff << 16); + if (end < start) + end += 0x10000; + return end - start; +} + +static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start) +{ + dma_addr_t end; + + end = omap_get_dma_dst_pos(ep->lch); + if (end == ep->dma_counter) + return 0; + + end |= start & (0xffff << 16); + if (cpu_is_omap15xx()) + end++; + if (end < start) + end += 0x10000; + return end - start; +} + + +/* Each USB transfer request using DMA maps to one or more DMA transfers. + * When DMA completion isn't request completion, the UDC continues with + * the next DMA transfer for that USB transfer. + */ + +static void next_in_dma(struct omap_ep *ep, struct omap_req *req) +{ + u16 txdma_ctrl, w; + unsigned length = req->req.length - req->req.actual; + const int sync_mode = cpu_is_omap15xx() + ? OMAP_DMA_SYNC_FRAME + : OMAP_DMA_SYNC_ELEMENT; + int dma_trigger = 0; + + /* measure length in either bytes or packets */ + if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC) + || (cpu_is_omap15xx() && length < ep->maxpacket)) { + txdma_ctrl = UDC_TXN_EOT | length; + omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8, + length, 1, sync_mode, dma_trigger, 0); + } else { + length = min(length / ep->maxpacket, + (unsigned) UDC_TXN_TSC + 1); + txdma_ctrl = length; + omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, + ep->ep.maxpacket >> 1, length, sync_mode, + dma_trigger, 0); + length *= ep->maxpacket; + } + omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF, + OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual, + 0, 0); + + omap_start_dma(ep->lch); + ep->dma_counter = omap_get_dma_src_pos(ep->lch); + w = omap_readw(UDC_DMA_IRQ_EN); + w |= UDC_TX_DONE_IE(ep->dma_channel); + omap_writew(w, UDC_DMA_IRQ_EN); + omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel)); + req->dma_bytes = length; +} + +static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status) +{ + u16 w; + + if (status == 0) { + req->req.actual += req->dma_bytes; + + /* return if this request needs to send data or zlp */ + if (req->req.actual < req->req.length) + return; + if (req->req.zero + && req->dma_bytes != 0 + && (req->req.actual % ep->maxpacket) == 0) + return; + } else + req->req.actual += dma_src_len(ep, req->req.dma + + req->req.actual); + + /* tx completion */ + omap_stop_dma(ep->lch); + w = omap_readw(UDC_DMA_IRQ_EN); + w &= ~UDC_TX_DONE_IE(ep->dma_channel); + omap_writew(w, UDC_DMA_IRQ_EN); + done(ep, req, status); +} + +static void next_out_dma(struct omap_ep *ep, struct omap_req *req) +{ + unsigned packets = req->req.length - req->req.actual; + int dma_trigger = 0; + u16 w; + + /* set up this DMA transfer, enable the fifo, start */ + packets /= ep->ep.maxpacket; + packets = min(packets, (unsigned)UDC_RXN_TC + 1); + req->dma_bytes = packets * ep->ep.maxpacket; + omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, + ep->ep.maxpacket >> 1, packets, + OMAP_DMA_SYNC_ELEMENT, + dma_trigger, 0); + omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF, + OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual, + 0, 0); + ep->dma_counter = omap_get_dma_dst_pos(ep->lch); + + omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel)); + w = omap_readw(UDC_DMA_IRQ_EN); + w |= UDC_RX_EOT_IE(ep->dma_channel); + omap_writew(w, UDC_DMA_IRQ_EN); + omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + + omap_start_dma(ep->lch); +} + +static void +finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one) +{ + u16 count, w; + + if (status == 0) + ep->dma_counter = (u16) (req->req.dma + req->req.actual); + count = dma_dest_len(ep, req->req.dma + req->req.actual); + count += req->req.actual; + if (one) + count--; + if (count <= req->req.length) + req->req.actual = count; + + if (count != req->dma_bytes || status) + omap_stop_dma(ep->lch); + + /* if this wasn't short, request may need another transfer */ + else if (req->req.actual < req->req.length) + return; + + /* rx completion */ + w = omap_readw(UDC_DMA_IRQ_EN); + w &= ~UDC_RX_EOT_IE(ep->dma_channel); + omap_writew(w, UDC_DMA_IRQ_EN); + done(ep, req, status); +} + +static void dma_irq(struct omap_udc *udc, u16 irq_src) +{ + u16 dman_stat = omap_readw(UDC_DMAN_STAT); + struct omap_ep *ep; + struct omap_req *req; + + /* IN dma: tx to host */ + if (irq_src & UDC_TXN_DONE) { + ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)]; + ep->irqs++; + /* can see TXN_DONE after dma abort */ + if (!list_empty(&ep->queue)) { + req = container_of(ep->queue.next, + struct omap_req, queue); + finish_in_dma(ep, req, 0); + } + omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC); + + if (!list_empty(&ep->queue)) { + req = container_of(ep->queue.next, + struct omap_req, queue); + next_in_dma(ep, req); + } + } + + /* OUT dma: rx from host */ + if (irq_src & UDC_RXN_EOT) { + ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)]; + ep->irqs++; + /* can see RXN_EOT after dma abort */ + if (!list_empty(&ep->queue)) { + req = container_of(ep->queue.next, + struct omap_req, queue); + finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB); + } + omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC); + + if (!list_empty(&ep->queue)) { + req = container_of(ep->queue.next, + struct omap_req, queue); + next_out_dma(ep, req); + } + } + + if (irq_src & UDC_RXN_CNT) { + ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)]; + ep->irqs++; + /* omap15xx does this unasked... */ + VDBG("%s, RX_CNT irq?\n", ep->ep.name); + omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC); + } +} + +static void dma_error(int lch, u16 ch_status, void *data) +{ + struct omap_ep *ep = data; + + /* if ch_status & OMAP_DMA_DROP_IRQ ... */ + /* if ch_status & OMAP1_DMA_TOUT_IRQ ... */ + ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status); + + /* complete current transfer ... */ +} + +static void dma_channel_claim(struct omap_ep *ep, unsigned channel) +{ + u16 reg; + int status, restart, is_in; + int dma_channel; + + is_in = ep->bEndpointAddress & USB_DIR_IN; + if (is_in) + reg = omap_readw(UDC_TXDMA_CFG); + else + reg = omap_readw(UDC_RXDMA_CFG); + reg |= UDC_DMA_REQ; /* "pulse" activated */ + + ep->dma_channel = 0; + ep->lch = -1; + if (channel == 0 || channel > 3) { + if ((reg & 0x0f00) == 0) + channel = 3; + else if ((reg & 0x00f0) == 0) + channel = 2; + else if ((reg & 0x000f) == 0) /* preferred for ISO */ + channel = 1; + else { + status = -EMLINK; + goto just_restart; + } + } + reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1)); + ep->dma_channel = channel; + + if (is_in) { + dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel; + status = omap_request_dma(dma_channel, + ep->ep.name, dma_error, ep, &ep->lch); + if (status == 0) { + omap_writew(reg, UDC_TXDMA_CFG); + /* EMIFF or SDRC */ + omap_set_dma_src_burst_mode(ep->lch, + OMAP_DMA_DATA_BURST_4); + omap_set_dma_src_data_pack(ep->lch, 1); + /* TIPB */ + omap_set_dma_dest_params(ep->lch, + OMAP_DMA_PORT_TIPB, + OMAP_DMA_AMODE_CONSTANT, + UDC_DATA_DMA, + 0, 0); + } + } else { + dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel; + status = omap_request_dma(dma_channel, + ep->ep.name, dma_error, ep, &ep->lch); + if (status == 0) { + omap_writew(reg, UDC_RXDMA_CFG); + /* TIPB */ + omap_set_dma_src_params(ep->lch, + OMAP_DMA_PORT_TIPB, + OMAP_DMA_AMODE_CONSTANT, + UDC_DATA_DMA, + 0, 0); + /* EMIFF or SDRC */ + omap_set_dma_dest_burst_mode(ep->lch, + OMAP_DMA_DATA_BURST_4); + omap_set_dma_dest_data_pack(ep->lch, 1); + } + } + if (status) + ep->dma_channel = 0; + else { + ep->has_dma = 1; + omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ); + + /* channel type P: hw synch (fifo) */ + if (!cpu_is_omap15xx()) + omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P); + } + +just_restart: + /* restart any queue, even if the claim failed */ + restart = !ep->stopped && !list_empty(&ep->queue); + + if (status) + DBG("%s no dma channel: %d%s\n", ep->ep.name, status, + restart ? " (restart)" : ""); + else + DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name, + is_in ? 't' : 'r', + ep->dma_channel - 1, ep->lch, + restart ? " (restart)" : ""); + + if (restart) { + struct omap_req *req; + req = container_of(ep->queue.next, struct omap_req, queue); + if (ep->has_dma) + (is_in ? next_in_dma : next_out_dma)(ep, req); + else { + use_ep(ep, UDC_EP_SEL); + (is_in ? write_fifo : read_fifo)(ep, req); + deselect_ep(); + if (!is_in) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + /* IN: 6 wait states before it'll tx */ + } + } +} + +static void dma_channel_release(struct omap_ep *ep) +{ + int shift = 4 * (ep->dma_channel - 1); + u16 mask = 0x0f << shift; + struct omap_req *req; + int active; + + /* abort any active usb transfer request */ + if (!list_empty(&ep->queue)) + req = container_of(ep->queue.next, struct omap_req, queue); + else + req = NULL; + + active = omap_get_dma_active_status(ep->lch); + + DBG("%s release %s %cxdma%d %p\n", ep->ep.name, + active ? "active" : "idle", + (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r', + ep->dma_channel - 1, req); + + /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before + * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them. + */ + + /* wait till current packet DMA finishes, and fifo empties */ + if (ep->bEndpointAddress & USB_DIR_IN) { + omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ, + UDC_TXDMA_CFG); + + if (req) { + finish_in_dma(ep, req, -ECONNRESET); + + /* clear FIFO; hosts probably won't empty it */ + use_ep(ep, UDC_EP_SEL); + omap_writew(UDC_CLR_EP, UDC_CTRL); + deselect_ep(); + } + while (omap_readw(UDC_TXDMA_CFG) & mask) + udelay(10); + } else { + omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ, + UDC_RXDMA_CFG); + + /* dma empties the fifo */ + while (omap_readw(UDC_RXDMA_CFG) & mask) + udelay(10); + if (req) + finish_out_dma(ep, req, -ECONNRESET, 0); + } + omap_free_dma(ep->lch); + ep->dma_channel = 0; + ep->lch = -1; + /* has_dma still set, till endpoint is fully quiesced */ +} + + +/*-------------------------------------------------------------------------*/ + +static int +omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) +{ + struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); + struct omap_req *req = container_of(_req, struct omap_req, req); + struct omap_udc *udc; + unsigned long flags; + int is_iso = 0; + + /* catch various bogus parameters */ + if (!_req || !req->req.complete || !req->req.buf + || !list_empty(&req->queue)) { + DBG("%s, bad params\n", __func__); + return -EINVAL; + } + if (!_ep || (!ep->ep.desc && ep->bEndpointAddress)) { + DBG("%s, bad ep\n", __func__); + return -EINVAL; + } + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + if (req->req.length > ep->ep.maxpacket) + return -EMSGSIZE; + is_iso = 1; + } + + /* this isn't bogus, but OMAP DMA isn't the only hardware to + * have a hard time with partial packet reads... reject it. + */ + if (use_dma + && ep->has_dma + && ep->bEndpointAddress != 0 + && (ep->bEndpointAddress & USB_DIR_IN) == 0 + && (req->req.length % ep->ep.maxpacket) != 0) { + DBG("%s, no partial packet OUT reads\n", __func__); + return -EMSGSIZE; + } + + udc = ep->udc; + if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) + return -ESHUTDOWN; + + if (use_dma && ep->has_dma) + usb_gadget_map_request(&udc->gadget, &req->req, + (ep->bEndpointAddress & USB_DIR_IN)); + + VDBG("%s queue req %p, len %d buf %p\n", + ep->ep.name, _req, _req->length, _req->buf); + + spin_lock_irqsave(&udc->lock, flags); + + req->req.status = -EINPROGRESS; + req->req.actual = 0; + + /* maybe kickstart non-iso i/o queues */ + if (is_iso) { + u16 w; + + w = omap_readw(UDC_IRQ_EN); + w |= UDC_SOF_IE; + omap_writew(w, UDC_IRQ_EN); + } else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) { + int is_in; + + if (ep->bEndpointAddress == 0) { + if (!udc->ep0_pending || !list_empty(&ep->queue)) { + spin_unlock_irqrestore(&udc->lock, flags); + return -EL2HLT; + } + + /* empty DATA stage? */ + is_in = udc->ep0_in; + if (!req->req.length) { + + /* chip became CONFIGURED or ADDRESSED + * earlier; drivers may already have queued + * requests to non-control endpoints + */ + if (udc->ep0_set_config) { + u16 irq_en = omap_readw(UDC_IRQ_EN); + + irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE; + if (!udc->ep0_reset_config) + irq_en |= UDC_EPN_RX_IE + | UDC_EPN_TX_IE; + omap_writew(irq_en, UDC_IRQ_EN); + } + + /* STATUS for zero length DATA stages is + * always an IN ... even for IN transfers, + * a weird case which seem to stall OMAP. + */ + omap_writew(UDC_EP_SEL | UDC_EP_DIR, + UDC_EP_NUM); + omap_writew(UDC_CLR_EP, UDC_CTRL); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + + /* cleanup */ + udc->ep0_pending = 0; + done(ep, req, 0); + req = NULL; + + /* non-empty DATA stage */ + } else if (is_in) { + omap_writew(UDC_EP_SEL | UDC_EP_DIR, + UDC_EP_NUM); + } else { + if (udc->ep0_setup) + goto irq_wait; + omap_writew(UDC_EP_SEL, UDC_EP_NUM); + } + } else { + is_in = ep->bEndpointAddress & USB_DIR_IN; + if (!ep->has_dma) + use_ep(ep, UDC_EP_SEL); + /* if ISO: SOF IRQs must be enabled/disabled! */ + } + + if (ep->has_dma) + (is_in ? next_in_dma : next_out_dma)(ep, req); + else if (req) { + if ((is_in ? write_fifo : read_fifo)(ep, req) == 1) + req = NULL; + deselect_ep(); + if (!is_in) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + /* IN: 6 wait states before it'll tx */ + } + } + +irq_wait: + /* irq handler advances the queue */ + if (req != NULL) + list_add_tail(&req->queue, &ep->queue); + spin_unlock_irqrestore(&udc->lock, flags); + + return 0; +} + +static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); + struct omap_req *req; + unsigned long flags; + + if (!_ep || !_req) + return -EINVAL; + + spin_lock_irqsave(&ep->udc->lock, flags); + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry(req, &ep->queue, queue) { + if (&req->req == _req) + break; + } + if (&req->req != _req) { + spin_unlock_irqrestore(&ep->udc->lock, flags); + return -EINVAL; + } + + if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) { + int channel = ep->dma_channel; + + /* releasing the channel cancels the request, + * reclaiming the channel restarts the queue + */ + dma_channel_release(ep); + dma_channel_claim(ep, channel); + } else + done(ep, req, -ECONNRESET); + spin_unlock_irqrestore(&ep->udc->lock, flags); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static int omap_ep_set_halt(struct usb_ep *_ep, int value) +{ + struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); + unsigned long flags; + int status = -EOPNOTSUPP; + + spin_lock_irqsave(&ep->udc->lock, flags); + + /* just use protocol stalls for ep0; real halts are annoying */ + if (ep->bEndpointAddress == 0) { + if (!ep->udc->ep0_pending) + status = -EINVAL; + else if (value) { + if (ep->udc->ep0_set_config) { + WARNING("error changing config?\n"); + omap_writew(UDC_CLR_CFG, UDC_SYSCON2); + } + omap_writew(UDC_STALL_CMD, UDC_SYSCON2); + ep->udc->ep0_pending = 0; + status = 0; + } else /* NOP */ + status = 0; + + /* otherwise, all active non-ISO endpoints can halt */ + } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->ep.desc) { + + /* IN endpoints must already be idle */ + if ((ep->bEndpointAddress & USB_DIR_IN) + && !list_empty(&ep->queue)) { + status = -EAGAIN; + goto done; + } + + if (value) { + int channel; + + if (use_dma && ep->dma_channel + && !list_empty(&ep->queue)) { + channel = ep->dma_channel; + dma_channel_release(ep); + } else + channel = 0; + + use_ep(ep, UDC_EP_SEL); + if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) { + omap_writew(UDC_SET_HALT, UDC_CTRL); + status = 0; + } else + status = -EAGAIN; + deselect_ep(); + + if (channel) + dma_channel_claim(ep, channel); + } else { + use_ep(ep, 0); + omap_writew(ep->udc->clr_halt, UDC_CTRL); + ep->ackwait = 0; + if (!(ep->bEndpointAddress & USB_DIR_IN)) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + } + } +done: + VDBG("%s %s halt stat %d\n", ep->ep.name, + value ? "set" : "clear", status); + + spin_unlock_irqrestore(&ep->udc->lock, flags); + return status; +} + +static const struct usb_ep_ops omap_ep_ops = { + .enable = omap_ep_enable, + .disable = omap_ep_disable, + + .alloc_request = omap_alloc_request, + .free_request = omap_free_request, + + .queue = omap_ep_queue, + .dequeue = omap_ep_dequeue, + + .set_halt = omap_ep_set_halt, + /* fifo_status ... report bytes in fifo */ + /* fifo_flush ... flush fifo */ +}; + +/*-------------------------------------------------------------------------*/ + +static int omap_get_frame(struct usb_gadget *gadget) +{ + u16 sof = omap_readw(UDC_SOF); + return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC; +} + +static int omap_wakeup(struct usb_gadget *gadget) +{ + struct omap_udc *udc; + unsigned long flags; + int retval = -EHOSTUNREACH; + + udc = container_of(gadget, struct omap_udc, gadget); + + spin_lock_irqsave(&udc->lock, flags); + if (udc->devstat & UDC_SUS) { + /* NOTE: OTG spec erratum says that OTG devices may + * issue wakeups without host enable. + */ + if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) { + DBG("remote wakeup...\n"); + omap_writew(UDC_RMT_WKP, UDC_SYSCON2); + retval = 0; + } + + /* NOTE: non-OTG systems may use SRP TOO... */ + } else if (!(udc->devstat & UDC_ATT)) { + if (!IS_ERR_OR_NULL(udc->transceiver)) + retval = otg_start_srp(udc->transceiver->otg); + } + spin_unlock_irqrestore(&udc->lock, flags); + + return retval; +} + +static int +omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered) +{ + struct omap_udc *udc; + unsigned long flags; + u16 syscon1; + + gadget->is_selfpowered = (is_selfpowered != 0); + udc = container_of(gadget, struct omap_udc, gadget); + spin_lock_irqsave(&udc->lock, flags); + syscon1 = omap_readw(UDC_SYSCON1); + if (is_selfpowered) + syscon1 |= UDC_SELF_PWR; + else + syscon1 &= ~UDC_SELF_PWR; + omap_writew(syscon1, UDC_SYSCON1); + spin_unlock_irqrestore(&udc->lock, flags); + + return 0; +} + +static int can_pullup(struct omap_udc *udc) +{ + return udc->driver && udc->softconnect && udc->vbus_active; +} + +static void pullup_enable(struct omap_udc *udc) +{ + u16 w; + + w = omap_readw(UDC_SYSCON1); + w |= UDC_PULLUP_EN; + omap_writew(w, UDC_SYSCON1); + if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) { + u32 l; + + l = omap_readl(OTG_CTRL); + l |= OTG_BSESSVLD; + omap_writel(l, OTG_CTRL); + } + omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN); +} + +static void pullup_disable(struct omap_udc *udc) +{ + u16 w; + + if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) { + u32 l; + + l = omap_readl(OTG_CTRL); + l &= ~OTG_BSESSVLD; + omap_writel(l, OTG_CTRL); + } + omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN); + w = omap_readw(UDC_SYSCON1); + w &= ~UDC_PULLUP_EN; + omap_writew(w, UDC_SYSCON1); +} + +static struct omap_udc *udc; + +static void omap_udc_enable_clock(int enable) +{ + if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL) + return; + + if (enable) { + clk_enable(udc->dc_clk); + clk_enable(udc->hhc_clk); + udelay(100); + } else { + clk_disable(udc->hhc_clk); + clk_disable(udc->dc_clk); + } +} + +/* + * Called by whatever detects VBUS sessions: external transceiver + * driver, or maybe GPIO0 VBUS IRQ. May request 48 MHz clock. + */ +static int omap_vbus_session(struct usb_gadget *gadget, int is_active) +{ + struct omap_udc *udc; + unsigned long flags; + u32 l; + + udc = container_of(gadget, struct omap_udc, gadget); + spin_lock_irqsave(&udc->lock, flags); + VDBG("VBUS %s\n", is_active ? "on" : "off"); + udc->vbus_active = (is_active != 0); + if (cpu_is_omap15xx()) { + /* "software" detect, ignored if !VBUS_MODE_1510 */ + l = omap_readl(FUNC_MUX_CTRL_0); + if (is_active) + l |= VBUS_CTRL_1510; + else + l &= ~VBUS_CTRL_1510; + omap_writel(l, FUNC_MUX_CTRL_0); + } + if (udc->dc_clk != NULL && is_active) { + if (!udc->clk_requested) { + omap_udc_enable_clock(1); + udc->clk_requested = 1; + } + } + if (can_pullup(udc)) + pullup_enable(udc); + else + pullup_disable(udc); + if (udc->dc_clk != NULL && !is_active) { + if (udc->clk_requested) { + omap_udc_enable_clock(0); + udc->clk_requested = 0; + } + } + spin_unlock_irqrestore(&udc->lock, flags); + return 0; +} + +static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA) +{ + struct omap_udc *udc; + + udc = container_of(gadget, struct omap_udc, gadget); + if (!IS_ERR_OR_NULL(udc->transceiver)) + return usb_phy_set_power(udc->transceiver, mA); + return -EOPNOTSUPP; +} + +static int omap_pullup(struct usb_gadget *gadget, int is_on) +{ + struct omap_udc *udc; + unsigned long flags; + + udc = container_of(gadget, struct omap_udc, gadget); + spin_lock_irqsave(&udc->lock, flags); + udc->softconnect = (is_on != 0); + if (can_pullup(udc)) + pullup_enable(udc); + else + pullup_disable(udc); + spin_unlock_irqrestore(&udc->lock, flags); + return 0; +} + +static int omap_udc_start(struct usb_gadget *g, + struct usb_gadget_driver *driver); +static int omap_udc_stop(struct usb_gadget *g); + +static const struct usb_gadget_ops omap_gadget_ops = { + .get_frame = omap_get_frame, + .wakeup = omap_wakeup, + .set_selfpowered = omap_set_selfpowered, + .vbus_session = omap_vbus_session, + .vbus_draw = omap_vbus_draw, + .pullup = omap_pullup, + .udc_start = omap_udc_start, + .udc_stop = omap_udc_stop, +}; + +/*-------------------------------------------------------------------------*/ + +/* dequeue ALL requests; caller holds udc->lock */ +static void nuke(struct omap_ep *ep, int status) +{ + struct omap_req *req; + + ep->stopped = 1; + + if (use_dma && ep->dma_channel) + dma_channel_release(ep); + + use_ep(ep, 0); + omap_writew(UDC_CLR_EP, UDC_CTRL); + if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC) + omap_writew(UDC_SET_HALT, UDC_CTRL); + + while (!list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, struct omap_req, queue); + done(ep, req, status); + } +} + +/* caller holds udc->lock */ +static void udc_quiesce(struct omap_udc *udc) +{ + struct omap_ep *ep; + + udc->gadget.speed = USB_SPEED_UNKNOWN; + nuke(&udc->ep[0], -ESHUTDOWN); + list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) + nuke(ep, -ESHUTDOWN); +} + +/*-------------------------------------------------------------------------*/ + +static void update_otg(struct omap_udc *udc) +{ + u16 devstat; + + if (!gadget_is_otg(&udc->gadget)) + return; + + if (omap_readl(OTG_CTRL) & OTG_ID) + devstat = omap_readw(UDC_DEVSTAT); + else + devstat = 0; + + udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE); + udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT); + udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT); + + /* Enable HNP early, avoiding races on suspend irq path. + * ASSUMES OTG state machine B_BUS_REQ input is true. + */ + if (udc->gadget.b_hnp_enable) { + u32 l; + + l = omap_readl(OTG_CTRL); + l |= OTG_B_HNPEN | OTG_B_BUSREQ; + l &= ~OTG_PULLUP; + omap_writel(l, OTG_CTRL); + } +} + +static void ep0_irq(struct omap_udc *udc, u16 irq_src) +{ + struct omap_ep *ep0 = &udc->ep[0]; + struct omap_req *req = NULL; + + ep0->irqs++; + + /* Clear any pending requests and then scrub any rx/tx state + * before starting to handle the SETUP request. + */ + if (irq_src & UDC_SETUP) { + u16 ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX); + + nuke(ep0, 0); + if (ack) { + omap_writew(ack, UDC_IRQ_SRC); + irq_src = UDC_SETUP; + } + } + + /* IN/OUT packets mean we're in the DATA or STATUS stage. + * This driver uses only uses protocol stalls (ep0 never halts), + * and if we got this far the gadget driver already had a + * chance to stall. Tries to be forgiving of host oddities. + * + * NOTE: the last chance gadget drivers have to stall control + * requests is during their request completion callback. + */ + if (!list_empty(&ep0->queue)) + req = container_of(ep0->queue.next, struct omap_req, queue); + + /* IN == TX to host */ + if (irq_src & UDC_EP0_TX) { + int stat; + + omap_writew(UDC_EP0_TX, UDC_IRQ_SRC); + omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); + stat = omap_readw(UDC_STAT_FLG); + if (stat & UDC_ACK) { + if (udc->ep0_in) { + /* write next IN packet from response, + * or set up the status stage. + */ + if (req) + stat = write_fifo(ep0, req); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + if (!req && udc->ep0_pending) { + omap_writew(UDC_EP_SEL, UDC_EP_NUM); + omap_writew(UDC_CLR_EP, UDC_CTRL); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(0, UDC_EP_NUM); + udc->ep0_pending = 0; + } /* else: 6 wait states before it'll tx */ + } else { + /* ack status stage of OUT transfer */ + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + if (req) + done(ep0, req, 0); + } + req = NULL; + } else if (stat & UDC_STALL) { + omap_writew(UDC_CLR_HALT, UDC_CTRL); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + } else { + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + } + } + + /* OUT == RX from host */ + if (irq_src & UDC_EP0_RX) { + int stat; + + omap_writew(UDC_EP0_RX, UDC_IRQ_SRC); + omap_writew(UDC_EP_SEL, UDC_EP_NUM); + stat = omap_readw(UDC_STAT_FLG); + if (stat & UDC_ACK) { + if (!udc->ep0_in) { + stat = 0; + /* read next OUT packet of request, maybe + * reactiviting the fifo; stall on errors. + */ + stat = read_fifo(ep0, req); + if (!req || stat < 0) { + omap_writew(UDC_STALL_CMD, UDC_SYSCON2); + udc->ep0_pending = 0; + stat = 0; + } else if (stat == 0) + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(0, UDC_EP_NUM); + + /* activate status stage */ + if (stat == 1) { + done(ep0, req, 0); + /* that may have STALLed ep0... */ + omap_writew(UDC_EP_SEL | UDC_EP_DIR, + UDC_EP_NUM); + omap_writew(UDC_CLR_EP, UDC_CTRL); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + udc->ep0_pending = 0; + } + } else { + /* ack status stage of IN transfer */ + omap_writew(0, UDC_EP_NUM); + if (req) + done(ep0, req, 0); + } + } else if (stat & UDC_STALL) { + omap_writew(UDC_CLR_HALT, UDC_CTRL); + omap_writew(0, UDC_EP_NUM); + } else { + omap_writew(0, UDC_EP_NUM); + } + } + + /* SETUP starts all control transfers */ + if (irq_src & UDC_SETUP) { + union u { + u16 word[4]; + struct usb_ctrlrequest r; + } u; + int status = -EINVAL; + struct omap_ep *ep; + + /* read the (latest) SETUP message */ + do { + omap_writew(UDC_SETUP_SEL, UDC_EP_NUM); + /* two bytes at a time */ + u.word[0] = omap_readw(UDC_DATA); + u.word[1] = omap_readw(UDC_DATA); + u.word[2] = omap_readw(UDC_DATA); + u.word[3] = omap_readw(UDC_DATA); + omap_writew(0, UDC_EP_NUM); + } while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP); + +#define w_value le16_to_cpu(u.r.wValue) +#define w_index le16_to_cpu(u.r.wIndex) +#define w_length le16_to_cpu(u.r.wLength) + + /* Delegate almost all control requests to the gadget driver, + * except for a handful of ch9 status/feature requests that + * hardware doesn't autodecode _and_ the gadget API hides. + */ + udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0; + udc->ep0_set_config = 0; + udc->ep0_pending = 1; + ep0->stopped = 0; + ep0->ackwait = 0; + switch (u.r.bRequest) { + case USB_REQ_SET_CONFIGURATION: + /* udc needs to know when ep != 0 is valid */ + if (u.r.bRequestType != USB_RECIP_DEVICE) + goto delegate; + if (w_length != 0) + goto do_stall; + udc->ep0_set_config = 1; + udc->ep0_reset_config = (w_value == 0); + VDBG("set config %d\n", w_value); + + /* update udc NOW since gadget driver may start + * queueing requests immediately; clear config + * later if it fails the request. + */ + if (udc->ep0_reset_config) + omap_writew(UDC_CLR_CFG, UDC_SYSCON2); + else + omap_writew(UDC_DEV_CFG, UDC_SYSCON2); + update_otg(udc); + goto delegate; + case USB_REQ_CLEAR_FEATURE: + /* clear endpoint halt */ + if (u.r.bRequestType != USB_RECIP_ENDPOINT) + goto delegate; + if (w_value != USB_ENDPOINT_HALT + || w_length != 0) + goto do_stall; + ep = &udc->ep[w_index & 0xf]; + if (ep != ep0) { + if (w_index & USB_DIR_IN) + ep += 16; + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC + || !ep->ep.desc) + goto do_stall; + use_ep(ep, 0); + omap_writew(udc->clr_halt, UDC_CTRL); + ep->ackwait = 0; + if (!(ep->bEndpointAddress & USB_DIR_IN)) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + /* NOTE: assumes the host behaves sanely, + * only clearing real halts. Else we may + * need to kill pending transfers and then + * restart the queue... very messy for DMA! + */ + } + VDBG("%s halt cleared by host\n", ep->name); + goto ep0out_status_stage; + case USB_REQ_SET_FEATURE: + /* set endpoint halt */ + if (u.r.bRequestType != USB_RECIP_ENDPOINT) + goto delegate; + if (w_value != USB_ENDPOINT_HALT + || w_length != 0) + goto do_stall; + ep = &udc->ep[w_index & 0xf]; + if (w_index & USB_DIR_IN) + ep += 16; + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC + || ep == ep0 || !ep->ep.desc) + goto do_stall; + if (use_dma && ep->has_dma) { + /* this has rude side-effects (aborts) and + * can't really work if DMA-IN is active + */ + DBG("%s host set_halt, NYET\n", ep->name); + goto do_stall; + } + use_ep(ep, 0); + /* can't halt if fifo isn't empty... */ + omap_writew(UDC_CLR_EP, UDC_CTRL); + omap_writew(UDC_SET_HALT, UDC_CTRL); + VDBG("%s halted by host\n", ep->name); +ep0out_status_stage: + status = 0; + omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); + omap_writew(UDC_CLR_EP, UDC_CTRL); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + udc->ep0_pending = 0; + break; + case USB_REQ_GET_STATUS: + /* USB_ENDPOINT_HALT status? */ + if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) + goto intf_status; + + /* ep0 never stalls */ + if (!(w_index & 0xf)) + goto zero_status; + + /* only active endpoints count */ + ep = &udc->ep[w_index & 0xf]; + if (w_index & USB_DIR_IN) + ep += 16; + if (!ep->ep.desc) + goto do_stall; + + /* iso never stalls */ + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) + goto zero_status; + + /* FIXME don't assume non-halted endpoints!! */ + ERR("%s status, can't report\n", ep->ep.name); + goto do_stall; + +intf_status: + /* return interface status. if we were pedantic, + * we'd detect non-existent interfaces, and stall. + */ + if (u.r.bRequestType + != (USB_DIR_IN|USB_RECIP_INTERFACE)) + goto delegate; + +zero_status: + /* return two zero bytes */ + omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); + omap_writew(0, UDC_DATA); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + omap_writew(UDC_EP_DIR, UDC_EP_NUM); + status = 0; + VDBG("GET_STATUS, interface %d\n", w_index); + /* next, status stage */ + break; + default: +delegate: + /* activate the ep0out fifo right away */ + if (!udc->ep0_in && w_length) { + omap_writew(0, UDC_EP_NUM); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + } + + /* gadget drivers see class/vendor specific requests, + * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION}, + * and more + */ + VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", + u.r.bRequestType, u.r.bRequest, + w_value, w_index, w_length); + +#undef w_value +#undef w_index +#undef w_length + + /* The gadget driver may return an error here, + * causing an immediate protocol stall. + * + * Else it must issue a response, either queueing a + * response buffer for the DATA stage, or halting ep0 + * (causing a protocol stall, not a real halt). A + * zero length buffer means no DATA stage. + * + * It's fine to issue that response after the setup() + * call returns, and this IRQ was handled. + */ + udc->ep0_setup = 1; + spin_unlock(&udc->lock); + status = udc->driver->setup(&udc->gadget, &u.r); + spin_lock(&udc->lock); + udc->ep0_setup = 0; + } + + if (status < 0) { +do_stall: + VDBG("req %02x.%02x protocol STALL; stat %d\n", + u.r.bRequestType, u.r.bRequest, status); + if (udc->ep0_set_config) { + if (udc->ep0_reset_config) + WARNING("error resetting config?\n"); + else + omap_writew(UDC_CLR_CFG, UDC_SYSCON2); + } + omap_writew(UDC_STALL_CMD, UDC_SYSCON2); + udc->ep0_pending = 0; + } + } +} + +/*-------------------------------------------------------------------------*/ + +#define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT) + +static void devstate_irq(struct omap_udc *udc, u16 irq_src) +{ + u16 devstat, change; + + devstat = omap_readw(UDC_DEVSTAT); + change = devstat ^ udc->devstat; + udc->devstat = devstat; + + if (change & (UDC_USB_RESET|UDC_ATT)) { + udc_quiesce(udc); + + if (change & UDC_ATT) { + /* driver for any external transceiver will + * have called omap_vbus_session() already + */ + if (devstat & UDC_ATT) { + udc->gadget.speed = USB_SPEED_FULL; + VDBG("connect\n"); + if (IS_ERR_OR_NULL(udc->transceiver)) + pullup_enable(udc); + /* if (driver->connect) call it */ + } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) { + udc->gadget.speed = USB_SPEED_UNKNOWN; + if (IS_ERR_OR_NULL(udc->transceiver)) + pullup_disable(udc); + DBG("disconnect, gadget %s\n", + udc->driver->driver.name); + if (udc->driver->disconnect) { + spin_unlock(&udc->lock); + udc->driver->disconnect(&udc->gadget); + spin_lock(&udc->lock); + } + } + change &= ~UDC_ATT; + } + + if (change & UDC_USB_RESET) { + if (devstat & UDC_USB_RESET) { + VDBG("RESET=1\n"); + } else { + udc->gadget.speed = USB_SPEED_FULL; + INFO("USB reset done, gadget %s\n", + udc->driver->driver.name); + /* ep0 traffic is legal from now on */ + omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE, + UDC_IRQ_EN); + } + change &= ~UDC_USB_RESET; + } + } + if (change & UDC_SUS) { + if (udc->gadget.speed != USB_SPEED_UNKNOWN) { + /* FIXME tell isp1301 to suspend/resume (?) */ + if (devstat & UDC_SUS) { + VDBG("suspend\n"); + update_otg(udc); + /* HNP could be under way already */ + if (udc->gadget.speed == USB_SPEED_FULL + && udc->driver->suspend) { + spin_unlock(&udc->lock); + udc->driver->suspend(&udc->gadget); + spin_lock(&udc->lock); + } + if (!IS_ERR_OR_NULL(udc->transceiver)) + usb_phy_set_suspend( + udc->transceiver, 1); + } else { + VDBG("resume\n"); + if (!IS_ERR_OR_NULL(udc->transceiver)) + usb_phy_set_suspend( + udc->transceiver, 0); + if (udc->gadget.speed == USB_SPEED_FULL + && udc->driver->resume) { + spin_unlock(&udc->lock); + udc->driver->resume(&udc->gadget); + spin_lock(&udc->lock); + } + } + } + change &= ~UDC_SUS; + } + if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) { + update_otg(udc); + change &= ~OTG_FLAGS; + } + + change &= ~(UDC_CFG|UDC_DEF|UDC_ADD); + if (change) + VDBG("devstat %03x, ignore change %03x\n", + devstat, change); + + omap_writew(UDC_DS_CHG, UDC_IRQ_SRC); +} + +static irqreturn_t omap_udc_irq(int irq, void *_udc) +{ + struct omap_udc *udc = _udc; + u16 irq_src; + irqreturn_t status = IRQ_NONE; + unsigned long flags; + + spin_lock_irqsave(&udc->lock, flags); + irq_src = omap_readw(UDC_IRQ_SRC); + + /* Device state change (usb ch9 stuff) */ + if (irq_src & UDC_DS_CHG) { + devstate_irq(_udc, irq_src); + status = IRQ_HANDLED; + irq_src &= ~UDC_DS_CHG; + } + + /* EP0 control transfers */ + if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) { + ep0_irq(_udc, irq_src); + status = IRQ_HANDLED; + irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX); + } + + /* DMA transfer completion */ + if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) { + dma_irq(_udc, irq_src); + status = IRQ_HANDLED; + irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT); + } + + irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX); + if (irq_src) + DBG("udc_irq, unhandled %03x\n", irq_src); + spin_unlock_irqrestore(&udc->lock, flags); + + return status; +} + +/* workaround for seemingly-lost IRQs for RX ACKs... */ +#define PIO_OUT_TIMEOUT (jiffies + HZ/3) +#define HALF_FULL(f) (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY))) + +static void pio_out_timer(struct timer_list *t) +{ + struct omap_ep *ep = from_timer(ep, t, timer); + unsigned long flags; + u16 stat_flg; + + spin_lock_irqsave(&ep->udc->lock, flags); + if (!list_empty(&ep->queue) && ep->ackwait) { + use_ep(ep, UDC_EP_SEL); + stat_flg = omap_readw(UDC_STAT_FLG); + + if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN) + || (ep->double_buf && HALF_FULL(stat_flg)))) { + struct omap_req *req; + + VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg); + req = container_of(ep->queue.next, + struct omap_req, queue); + (void) read_fifo(ep, req); + omap_writew(ep->bEndpointAddress, UDC_EP_NUM); + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } else + deselect_ep(); + } + mod_timer(&ep->timer, PIO_OUT_TIMEOUT); + spin_unlock_irqrestore(&ep->udc->lock, flags); +} + +static irqreturn_t omap_udc_pio_irq(int irq, void *_dev) +{ + u16 epn_stat, irq_src; + irqreturn_t status = IRQ_NONE; + struct omap_ep *ep; + int epnum; + struct omap_udc *udc = _dev; + struct omap_req *req; + unsigned long flags; + + spin_lock_irqsave(&udc->lock, flags); + epn_stat = omap_readw(UDC_EPN_STAT); + irq_src = omap_readw(UDC_IRQ_SRC); + + /* handle OUT first, to avoid some wasteful NAKs */ + if (irq_src & UDC_EPN_RX) { + epnum = (epn_stat >> 8) & 0x0f; + omap_writew(UDC_EPN_RX, UDC_IRQ_SRC); + status = IRQ_HANDLED; + ep = &udc->ep[epnum]; + ep->irqs++; + + omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM); + ep->fnf = 0; + if (omap_readw(UDC_STAT_FLG) & UDC_ACK) { + ep->ackwait--; + if (!list_empty(&ep->queue)) { + int stat; + req = container_of(ep->queue.next, + struct omap_req, queue); + stat = read_fifo(ep, req); + if (!ep->double_buf) + ep->fnf = 1; + } + } + /* min 6 clock delay before clearing EP_SEL ... */ + epn_stat = omap_readw(UDC_EPN_STAT); + epn_stat = omap_readw(UDC_EPN_STAT); + omap_writew(epnum, UDC_EP_NUM); + + /* enabling fifo _after_ clearing ACK, contrary to docs, + * reduces lossage; timer still needed though (sigh). + */ + if (ep->fnf) { + omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); + ep->ackwait = 1 + ep->double_buf; + } + mod_timer(&ep->timer, PIO_OUT_TIMEOUT); + } + + /* then IN transfers */ + else if (irq_src & UDC_EPN_TX) { + epnum = epn_stat & 0x0f; + omap_writew(UDC_EPN_TX, UDC_IRQ_SRC); + status = IRQ_HANDLED; + ep = &udc->ep[16 + epnum]; + ep->irqs++; + + omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM); + if (omap_readw(UDC_STAT_FLG) & UDC_ACK) { + ep->ackwait = 0; + if (!list_empty(&ep->queue)) { + req = container_of(ep->queue.next, + struct omap_req, queue); + (void) write_fifo(ep, req); + } + } + /* min 6 clock delay before clearing EP_SEL ... */ + epn_stat = omap_readw(UDC_EPN_STAT); + epn_stat = omap_readw(UDC_EPN_STAT); + omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM); + /* then 6 clocks before it'd tx */ + } + + spin_unlock_irqrestore(&udc->lock, flags); + return status; +} + +#ifdef USE_ISO +static irqreturn_t omap_udc_iso_irq(int irq, void *_dev) +{ + struct omap_udc *udc = _dev; + struct omap_ep *ep; + int pending = 0; + unsigned long flags; + + spin_lock_irqsave(&udc->lock, flags); + + /* handle all non-DMA ISO transfers */ + list_for_each_entry(ep, &udc->iso, iso) { + u16 stat; + struct omap_req *req; + + if (ep->has_dma || list_empty(&ep->queue)) + continue; + req = list_entry(ep->queue.next, struct omap_req, queue); + + use_ep(ep, UDC_EP_SEL); + stat = omap_readw(UDC_STAT_FLG); + + /* NOTE: like the other controller drivers, this isn't + * currently reporting lost or damaged frames. + */ + if (ep->bEndpointAddress & USB_DIR_IN) { + if (stat & UDC_MISS_IN) + /* done(ep, req, -EPROTO) */; + else + write_fifo(ep, req); + } else { + int status = 0; + + if (stat & UDC_NO_RXPACKET) + status = -EREMOTEIO; + else if (stat & UDC_ISO_ERR) + status = -EILSEQ; + else if (stat & UDC_DATA_FLUSH) + status = -ENOSR; + + if (status) + /* done(ep, req, status) */; + else + read_fifo(ep, req); + } + deselect_ep(); + /* 6 wait states before next EP */ + + ep->irqs++; + if (!list_empty(&ep->queue)) + pending = 1; + } + if (!pending) { + u16 w; + + w = omap_readw(UDC_IRQ_EN); + w &= ~UDC_SOF_IE; + omap_writew(w, UDC_IRQ_EN); + } + omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC); + + spin_unlock_irqrestore(&udc->lock, flags); + return IRQ_HANDLED; +} +#endif + +/*-------------------------------------------------------------------------*/ + +static inline int machine_without_vbus_sense(void) +{ + return machine_is_omap_innovator() + || machine_is_omap_osk() + || machine_is_omap_palmte() + || machine_is_sx1() + /* No known omap7xx boards with vbus sense */ + || cpu_is_omap7xx(); +} + +static int omap_udc_start(struct usb_gadget *g, + struct usb_gadget_driver *driver) +{ + int status; + struct omap_ep *ep; + unsigned long flags; + + + spin_lock_irqsave(&udc->lock, flags); + /* reset state */ + list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { + ep->irqs = 0; + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) + continue; + use_ep(ep, 0); + omap_writew(UDC_SET_HALT, UDC_CTRL); + } + udc->ep0_pending = 0; + udc->ep[0].irqs = 0; + udc->softconnect = 1; + + /* hook up the driver */ + driver->driver.bus = NULL; + udc->driver = driver; + spin_unlock_irqrestore(&udc->lock, flags); + + if (udc->dc_clk != NULL) + omap_udc_enable_clock(1); + + omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC); + + /* connect to bus through transceiver */ + if (!IS_ERR_OR_NULL(udc->transceiver)) { + status = otg_set_peripheral(udc->transceiver->otg, + &udc->gadget); + if (status < 0) { + ERR("can't bind to transceiver\n"); + udc->driver = NULL; + goto done; + } + } else { + status = 0; + if (can_pullup(udc)) + pullup_enable(udc); + else + pullup_disable(udc); + } + + /* boards that don't have VBUS sensing can't autogate 48MHz; + * can't enter deep sleep while a gadget driver is active. + */ + if (machine_without_vbus_sense()) + omap_vbus_session(&udc->gadget, 1); + +done: + if (udc->dc_clk != NULL) + omap_udc_enable_clock(0); + + return status; +} + +static int omap_udc_stop(struct usb_gadget *g) +{ + unsigned long flags; + + if (udc->dc_clk != NULL) + omap_udc_enable_clock(1); + + if (machine_without_vbus_sense()) + omap_vbus_session(&udc->gadget, 0); + + if (!IS_ERR_OR_NULL(udc->transceiver)) + (void) otg_set_peripheral(udc->transceiver->otg, NULL); + else + pullup_disable(udc); + + spin_lock_irqsave(&udc->lock, flags); + udc_quiesce(udc); + spin_unlock_irqrestore(&udc->lock, flags); + + udc->driver = NULL; + + if (udc->dc_clk != NULL) + omap_udc_enable_clock(0); + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_USB_GADGET_DEBUG_FILES + +#include <linux/seq_file.h> + +static const char proc_filename[] = "driver/udc"; + +#define FOURBITS "%s%s%s%s" +#define EIGHTBITS "%s%s%s%s%s%s%s%s" + +static void proc_ep_show(struct seq_file *s, struct omap_ep *ep) +{ + u16 stat_flg; + struct omap_req *req; + char buf[20]; + + use_ep(ep, 0); + + if (use_dma && ep->has_dma) + snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ", + (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r', + ep->dma_channel - 1, ep->lch); + else + buf[0] = 0; + + stat_flg = omap_readw(UDC_STAT_FLG); + seq_printf(s, + "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n", + ep->name, buf, + ep->double_buf ? "dbuf " : "", + ({ char *s; + switch (ep->ackwait) { + case 0: + s = ""; + break; + case 1: + s = "(ackw) "; + break; + case 2: + s = "(ackw2) "; + break; + default: + s = "(?) "; + break; + } s; }), + ep->irqs, stat_flg, + (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "", + (stat_flg & UDC_MISS_IN) ? "miss_in " : "", + (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "", + (stat_flg & UDC_ISO_ERR) ? "iso_err " : "", + (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "", + (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "", + (stat_flg & UDC_EP_HALTED) ? "HALT " : "", + (stat_flg & UDC_STALL) ? "STALL " : "", + (stat_flg & UDC_NAK) ? "NAK " : "", + (stat_flg & UDC_ACK) ? "ACK " : "", + (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "", + (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "", + (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : ""); + + if (list_empty(&ep->queue)) + seq_printf(s, "\t(queue empty)\n"); + else + list_for_each_entry(req, &ep->queue, queue) { + unsigned length = req->req.actual; + + if (use_dma && buf[0]) { + length += ((ep->bEndpointAddress & USB_DIR_IN) + ? dma_src_len : dma_dest_len) + (ep, req->req.dma + length); + buf[0] = 0; + } + seq_printf(s, "\treq %p len %d/%d buf %p\n", + &req->req, length, + req->req.length, req->req.buf); + } +} + +static char *trx_mode(unsigned m, int enabled) +{ + switch (m) { + case 0: + return enabled ? "*6wire" : "unused"; + case 1: + return "4wire"; + case 2: + return "3wire"; + case 3: + return "6wire"; + default: + return "unknown"; + } +} + +static int proc_otg_show(struct seq_file *s) +{ + u32 tmp; + u32 trans = 0; + char *ctrl_name = "(UNKNOWN)"; + + tmp = omap_readl(OTG_REV); + ctrl_name = "tranceiver_ctrl"; + trans = omap_readw(USB_TRANSCEIVER_CTRL); + seq_printf(s, "\nOTG rev %d.%d, %s %05x\n", + tmp >> 4, tmp & 0xf, ctrl_name, trans); + tmp = omap_readw(OTG_SYSCON_1); + seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s," + FOURBITS "\n", tmp, + trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R), + trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R), + (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710()) + ? "internal" + : trx_mode(USB0_TRX_MODE(tmp), 1), + (tmp & OTG_IDLE_EN) ? " !otg" : "", + (tmp & HST_IDLE_EN) ? " !host" : "", + (tmp & DEV_IDLE_EN) ? " !dev" : "", + (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active"); + tmp = omap_readl(OTG_SYSCON_2); + seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS + " b_ase_brst=%d hmc=%d\n", tmp, + (tmp & OTG_EN) ? " otg_en" : "", + (tmp & USBX_SYNCHRO) ? " synchro" : "", + /* much more SRP stuff */ + (tmp & SRP_DATA) ? " srp_data" : "", + (tmp & SRP_VBUS) ? " srp_vbus" : "", + (tmp & OTG_PADEN) ? " otg_paden" : "", + (tmp & HMC_PADEN) ? " hmc_paden" : "", + (tmp & UHOST_EN) ? " uhost_en" : "", + (tmp & HMC_TLLSPEED) ? " tllspeed" : "", + (tmp & HMC_TLLATTACH) ? " tllattach" : "", + B_ASE_BRST(tmp), + OTG_HMC(tmp)); + tmp = omap_readl(OTG_CTRL); + seq_printf(s, "otg_ctrl %06x" EIGHTBITS EIGHTBITS "%s\n", tmp, + (tmp & OTG_ASESSVLD) ? " asess" : "", + (tmp & OTG_BSESSEND) ? " bsess_end" : "", + (tmp & OTG_BSESSVLD) ? " bsess" : "", + (tmp & OTG_VBUSVLD) ? " vbus" : "", + (tmp & OTG_ID) ? " id" : "", + (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST", + (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "", + (tmp & OTG_A_BUSREQ) ? " a_bus" : "", + (tmp & OTG_B_HNPEN) ? " b_hnpen" : "", + (tmp & OTG_B_BUSREQ) ? " b_bus" : "", + (tmp & OTG_BUSDROP) ? " busdrop" : "", + (tmp & OTG_PULLDOWN) ? " down" : "", + (tmp & OTG_PULLUP) ? " up" : "", + (tmp & OTG_DRV_VBUS) ? " drv" : "", + (tmp & OTG_PD_VBUS) ? " pd_vb" : "", + (tmp & OTG_PU_VBUS) ? " pu_vb" : "", + (tmp & OTG_PU_ID) ? " pu_id" : "" + ); + tmp = omap_readw(OTG_IRQ_EN); + seq_printf(s, "otg_irq_en %04x" "\n", tmp); + tmp = omap_readw(OTG_IRQ_SRC); + seq_printf(s, "otg_irq_src %04x" "\n", tmp); + tmp = omap_readw(OTG_OUTCTRL); + seq_printf(s, "otg_outctrl %04x" "\n", tmp); + tmp = omap_readw(OTG_TEST); + seq_printf(s, "otg_test %04x" "\n", tmp); + return 0; +} + +static int proc_udc_show(struct seq_file *s, void *_) +{ + u32 tmp; + struct omap_ep *ep; + unsigned long flags; + + spin_lock_irqsave(&udc->lock, flags); + + seq_printf(s, "%s, version: " DRIVER_VERSION +#ifdef USE_ISO + " (iso)" +#endif + "%s\n", + driver_desc, + use_dma ? " (dma)" : ""); + + tmp = omap_readw(UDC_REV) & 0xff; + seq_printf(s, + "UDC rev %d.%d, fifo mode %d, gadget %s\n" + "hmc %d, transceiver %s\n", + tmp >> 4, tmp & 0xf, + fifo_mode, + udc->driver ? udc->driver->driver.name : "(none)", + HMC, + udc->transceiver + ? udc->transceiver->label + : (cpu_is_omap1710() + ? "external" : "(none)")); + seq_printf(s, "ULPD control %04x req %04x status %04x\n", + omap_readw(ULPD_CLOCK_CTRL), + omap_readw(ULPD_SOFT_REQ), + omap_readw(ULPD_STATUS_REQ)); + + /* OTG controller registers */ + if (!cpu_is_omap15xx()) + proc_otg_show(s); + + tmp = omap_readw(UDC_SYSCON1); + seq_printf(s, "\nsyscon1 %04x" EIGHTBITS "\n", tmp, + (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "", + (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "", + (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "", + (tmp & UDC_NAK_EN) ? " nak" : "", + (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "", + (tmp & UDC_SELF_PWR) ? " self_pwr" : "", + (tmp & UDC_SOFF_DIS) ? " soff_dis" : "", + (tmp & UDC_PULLUP_EN) ? " PULLUP" : ""); + /* syscon2 is write-only */ + + /* UDC controller registers */ + if (!(tmp & UDC_PULLUP_EN)) { + seq_printf(s, "(suspended)\n"); + spin_unlock_irqrestore(&udc->lock, flags); + return 0; + } + + tmp = omap_readw(UDC_DEVSTAT); + seq_printf(s, "devstat %04x" EIGHTBITS "%s%s\n", tmp, + (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "", + (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "", + (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "", + (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "", + (tmp & UDC_USB_RESET) ? " usb_reset" : "", + (tmp & UDC_SUS) ? " SUS" : "", + (tmp & UDC_CFG) ? " CFG" : "", + (tmp & UDC_ADD) ? " ADD" : "", + (tmp & UDC_DEF) ? " DEF" : "", + (tmp & UDC_ATT) ? " ATT" : ""); + seq_printf(s, "sof %04x\n", omap_readw(UDC_SOF)); + tmp = omap_readw(UDC_IRQ_EN); + seq_printf(s, "irq_en %04x" FOURBITS "%s\n", tmp, + (tmp & UDC_SOF_IE) ? " sof" : "", + (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "", + (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "", + (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "", + (tmp & UDC_EP0_IE) ? " ep0" : ""); + tmp = omap_readw(UDC_IRQ_SRC); + seq_printf(s, "irq_src %04x" EIGHTBITS "%s%s\n", tmp, + (tmp & UDC_TXN_DONE) ? " txn_done" : "", + (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "", + (tmp & UDC_RXN_EOT) ? " rxn_eot" : "", + (tmp & UDC_IRQ_SOF) ? " sof" : "", + (tmp & UDC_EPN_RX) ? " epn_rx" : "", + (tmp & UDC_EPN_TX) ? " epn_tx" : "", + (tmp & UDC_DS_CHG) ? " ds_chg" : "", + (tmp & UDC_SETUP) ? " setup" : "", + (tmp & UDC_EP0_RX) ? " ep0out" : "", + (tmp & UDC_EP0_TX) ? " ep0in" : ""); + if (use_dma) { + unsigned i; + + tmp = omap_readw(UDC_DMA_IRQ_EN); + seq_printf(s, "dma_irq_en %04x%s" EIGHTBITS "\n", tmp, + (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "", + (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "", + (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "", + + (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "", + (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "", + (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "", + + (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "", + (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "", + (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : ""); + + tmp = omap_readw(UDC_RXDMA_CFG); + seq_printf(s, "rxdma_cfg %04x\n", tmp); + if (tmp) { + for (i = 0; i < 3; i++) { + if ((tmp & (0x0f << (i * 4))) == 0) + continue; + seq_printf(s, "rxdma[%d] %04x\n", i, + omap_readw(UDC_RXDMA(i + 1))); + } + } + tmp = omap_readw(UDC_TXDMA_CFG); + seq_printf(s, "txdma_cfg %04x\n", tmp); + if (tmp) { + for (i = 0; i < 3; i++) { + if (!(tmp & (0x0f << (i * 4)))) + continue; + seq_printf(s, "txdma[%d] %04x\n", i, + omap_readw(UDC_TXDMA(i + 1))); + } + } + } + + tmp = omap_readw(UDC_DEVSTAT); + if (tmp & UDC_ATT) { + proc_ep_show(s, &udc->ep[0]); + if (tmp & UDC_ADD) { + list_for_each_entry(ep, &udc->gadget.ep_list, + ep.ep_list) { + if (ep->ep.desc) + proc_ep_show(s, ep); + } + } + } + spin_unlock_irqrestore(&udc->lock, flags); + return 0; +} + +static void create_proc_file(void) +{ + proc_create_single(proc_filename, 0, NULL, proc_udc_show); +} + +static void remove_proc_file(void) +{ + remove_proc_entry(proc_filename, NULL); +} + +#else + +static inline void create_proc_file(void) {} +static inline void remove_proc_file(void) {} + +#endif + +/*-------------------------------------------------------------------------*/ + +/* Before this controller can enumerate, we need to pick an endpoint + * configuration, or "fifo_mode" That involves allocating 2KB of packet + * buffer space among the endpoints we'll be operating. + * + * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when + * UDC_SYSCON_1.CFG_LOCK is set can now work. We won't use that + * capability yet though. + */ +static unsigned +omap_ep_setup(char *name, u8 addr, u8 type, + unsigned buf, unsigned maxp, int dbuf) +{ + struct omap_ep *ep; + u16 epn_rxtx = 0; + + /* OUT endpoints first, then IN */ + ep = &udc->ep[addr & 0xf]; + if (addr & USB_DIR_IN) + ep += 16; + + /* in case of ep init table bugs */ + BUG_ON(ep->name[0]); + + /* chip setup ... bit values are same for IN, OUT */ + if (type == USB_ENDPOINT_XFER_ISOC) { + switch (maxp) { + case 8: + epn_rxtx = 0 << 12; + break; + case 16: + epn_rxtx = 1 << 12; + break; + case 32: + epn_rxtx = 2 << 12; + break; + case 64: + epn_rxtx = 3 << 12; + break; + case 128: + epn_rxtx = 4 << 12; + break; + case 256: + epn_rxtx = 5 << 12; + break; + case 512: + epn_rxtx = 6 << 12; + break; + default: + BUG(); + } + epn_rxtx |= UDC_EPN_RX_ISO; + dbuf = 1; + } else { + /* double-buffering "not supported" on 15xx, + * and ignored for PIO-IN on newer chips + * (for more reliable behavior) + */ + if (!use_dma || cpu_is_omap15xx()) + dbuf = 0; + + switch (maxp) { + case 8: + epn_rxtx = 0 << 12; + break; + case 16: + epn_rxtx = 1 << 12; + break; + case 32: + epn_rxtx = 2 << 12; + break; + case 64: + epn_rxtx = 3 << 12; + break; + default: + BUG(); + } + if (dbuf && addr) + epn_rxtx |= UDC_EPN_RX_DB; + timer_setup(&ep->timer, pio_out_timer, 0); + } + if (addr) + epn_rxtx |= UDC_EPN_RX_VALID; + BUG_ON(buf & 0x07); + epn_rxtx |= buf >> 3; + + DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n", + name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf); + + if (addr & USB_DIR_IN) + omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf)); + else + omap_writew(epn_rxtx, UDC_EP_RX(addr)); + + /* next endpoint's buffer starts after this one's */ + buf += maxp; + if (dbuf) + buf += maxp; + BUG_ON(buf > 2048); + + /* set up driver data structures */ + BUG_ON(strlen(name) >= sizeof ep->name); + strlcpy(ep->name, name, sizeof ep->name); + INIT_LIST_HEAD(&ep->queue); + INIT_LIST_HEAD(&ep->iso); + ep->bEndpointAddress = addr; + ep->bmAttributes = type; + ep->double_buf = dbuf; + ep->udc = udc; + + switch (type) { + case USB_ENDPOINT_XFER_CONTROL: + ep->ep.caps.type_control = true; + ep->ep.caps.dir_in = true; + ep->ep.caps.dir_out = true; + break; + case USB_ENDPOINT_XFER_ISOC: + ep->ep.caps.type_iso = true; + break; + case USB_ENDPOINT_XFER_BULK: + ep->ep.caps.type_bulk = true; + break; + case USB_ENDPOINT_XFER_INT: + ep->ep.caps.type_int = true; + break; + } + + if (addr & USB_DIR_IN) + ep->ep.caps.dir_in = true; + else + ep->ep.caps.dir_out = true; + + ep->ep.name = ep->name; + ep->ep.ops = &omap_ep_ops; + ep->maxpacket = maxp; + usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); + list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); + + return buf; +} + +static void omap_udc_release(struct device *dev) +{ + pullup_disable(udc); + if (!IS_ERR_OR_NULL(udc->transceiver)) { + usb_put_phy(udc->transceiver); + udc->transceiver = NULL; + } + omap_writew(0, UDC_SYSCON1); + remove_proc_file(); + if (udc->dc_clk) { + if (udc->clk_requested) + omap_udc_enable_clock(0); + clk_put(udc->hhc_clk); + clk_put(udc->dc_clk); + } + if (udc->done) + complete(udc->done); + kfree(udc); +} + +static int +omap_udc_setup(struct platform_device *odev, struct usb_phy *xceiv) +{ + unsigned tmp, buf; + + /* abolish any previous hardware state */ + omap_writew(0, UDC_SYSCON1); + omap_writew(0, UDC_IRQ_EN); + omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC); + omap_writew(0, UDC_DMA_IRQ_EN); + omap_writew(0, UDC_RXDMA_CFG); + omap_writew(0, UDC_TXDMA_CFG); + + /* UDC_PULLUP_EN gates the chip clock */ + /* OTG_SYSCON_1 |= DEV_IDLE_EN; */ + + udc = kzalloc(sizeof(*udc), GFP_KERNEL); + if (!udc) + return -ENOMEM; + + spin_lock_init(&udc->lock); + + udc->gadget.ops = &omap_gadget_ops; + udc->gadget.ep0 = &udc->ep[0].ep; + INIT_LIST_HEAD(&udc->gadget.ep_list); + INIT_LIST_HEAD(&udc->iso); + udc->gadget.speed = USB_SPEED_UNKNOWN; + udc->gadget.max_speed = USB_SPEED_FULL; + udc->gadget.name = driver_name; + udc->gadget.quirk_ep_out_aligned_size = 1; + udc->transceiver = xceiv; + + /* ep0 is special; put it right after the SETUP buffer */ + buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL, + 8 /* after SETUP */, 64 /* maxpacket */, 0); + list_del_init(&udc->ep[0].ep.ep_list); + + /* initially disable all non-ep0 endpoints */ + for (tmp = 1; tmp < 15; tmp++) { + omap_writew(0, UDC_EP_RX(tmp)); + omap_writew(0, UDC_EP_TX(tmp)); + } + +#define OMAP_BULK_EP(name, addr) \ + buf = omap_ep_setup(name "-bulk", addr, \ + USB_ENDPOINT_XFER_BULK, buf, 64, 1); +#define OMAP_INT_EP(name, addr, maxp) \ + buf = omap_ep_setup(name "-int", addr, \ + USB_ENDPOINT_XFER_INT, buf, maxp, 0); +#define OMAP_ISO_EP(name, addr, maxp) \ + buf = omap_ep_setup(name "-iso", addr, \ + USB_ENDPOINT_XFER_ISOC, buf, maxp, 1); + + switch (fifo_mode) { + case 0: + OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); + OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); + OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16); + break; + case 1: + OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); + OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); + OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16); + + OMAP_BULK_EP("ep3in", USB_DIR_IN | 3); + OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4); + OMAP_INT_EP("ep10in", USB_DIR_IN | 10, 16); + + OMAP_BULK_EP("ep5in", USB_DIR_IN | 5); + OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5); + OMAP_INT_EP("ep11in", USB_DIR_IN | 11, 16); + + OMAP_BULK_EP("ep6in", USB_DIR_IN | 6); + OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6); + OMAP_INT_EP("ep12in", USB_DIR_IN | 12, 16); + + OMAP_BULK_EP("ep7in", USB_DIR_IN | 7); + OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7); + OMAP_INT_EP("ep13in", USB_DIR_IN | 13, 16); + OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16); + + OMAP_BULK_EP("ep8in", USB_DIR_IN | 8); + OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8); + OMAP_INT_EP("ep14in", USB_DIR_IN | 14, 16); + OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16); + + OMAP_BULK_EP("ep15in", USB_DIR_IN | 15); + OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15); + + break; + +#ifdef USE_ISO + case 2: /* mixed iso/bulk */ + OMAP_ISO_EP("ep1in", USB_DIR_IN | 1, 256); + OMAP_ISO_EP("ep2out", USB_DIR_OUT | 2, 256); + OMAP_ISO_EP("ep3in", USB_DIR_IN | 3, 128); + OMAP_ISO_EP("ep4out", USB_DIR_OUT | 4, 128); + + OMAP_INT_EP("ep5in", USB_DIR_IN | 5, 16); + + OMAP_BULK_EP("ep6in", USB_DIR_IN | 6); + OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7); + OMAP_INT_EP("ep8in", USB_DIR_IN | 8, 16); + break; + case 3: /* mixed bulk/iso */ + OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); + OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); + OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16); + + OMAP_BULK_EP("ep4in", USB_DIR_IN | 4); + OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5); + OMAP_INT_EP("ep6in", USB_DIR_IN | 6, 16); + + OMAP_ISO_EP("ep7in", USB_DIR_IN | 7, 256); + OMAP_ISO_EP("ep8out", USB_DIR_OUT | 8, 256); + OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16); + break; +#endif + + /* add more modes as needed */ + + default: + ERR("unsupported fifo_mode #%d\n", fifo_mode); + return -ENODEV; + } + omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1); + INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf); + return 0; +} + +static int omap_udc_probe(struct platform_device *pdev) +{ + int status = -ENODEV; + int hmc; + struct usb_phy *xceiv = NULL; + const char *type = NULL; + struct omap_usb_config *config = dev_get_platdata(&pdev->dev); + struct clk *dc_clk = NULL; + struct clk *hhc_clk = NULL; + + if (cpu_is_omap7xx()) + use_dma = 0; + + /* NOTE: "knows" the order of the resources! */ + if (!request_mem_region(pdev->resource[0].start, + resource_size(&pdev->resource[0]), + driver_name)) { + DBG("request_mem_region failed\n"); + return -EBUSY; + } + + if (cpu_is_omap16xx()) { + dc_clk = clk_get(&pdev->dev, "usb_dc_ck"); + hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck"); + BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk)); + /* can't use omap_udc_enable_clock yet */ + clk_enable(dc_clk); + clk_enable(hhc_clk); + udelay(100); + } + + if (cpu_is_omap7xx()) { + dc_clk = clk_get(&pdev->dev, "usb_dc_ck"); + hhc_clk = clk_get(&pdev->dev, "l3_ocpi_ck"); + BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk)); + /* can't use omap_udc_enable_clock yet */ + clk_enable(dc_clk); + clk_enable(hhc_clk); + udelay(100); + } + + INFO("OMAP UDC rev %d.%d%s\n", + omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf, + config->otg ? ", Mini-AB" : ""); + + /* use the mode given to us by board init code */ + if (cpu_is_omap15xx()) { + hmc = HMC_1510; + type = "(unknown)"; + + if (machine_without_vbus_sense()) { + /* just set up software VBUS detect, and then + * later rig it so we always report VBUS. + * FIXME without really sensing VBUS, we can't + * know when to turn PULLUP_EN on/off; and that + * means we always "need" the 48MHz clock. + */ + u32 tmp = omap_readl(FUNC_MUX_CTRL_0); + tmp &= ~VBUS_CTRL_1510; + omap_writel(tmp, FUNC_MUX_CTRL_0); + tmp |= VBUS_MODE_1510; + tmp &= ~VBUS_CTRL_1510; + omap_writel(tmp, FUNC_MUX_CTRL_0); + } + } else { + /* The transceiver may package some GPIO logic or handle + * loopback and/or transceiverless setup; if we find one, + * use it. Except for OTG, we don't _need_ to talk to one; + * but not having one probably means no VBUS detection. + */ + xceiv = usb_get_phy(USB_PHY_TYPE_USB2); + if (!IS_ERR_OR_NULL(xceiv)) + type = xceiv->label; + else if (config->otg) { + DBG("OTG requires external transceiver!\n"); + goto cleanup0; + } + + hmc = HMC_1610; + + switch (hmc) { + case 0: /* POWERUP DEFAULT == 0 */ + case 4: + case 12: + case 20: + if (!cpu_is_omap1710()) { + type = "integrated"; + break; + } + fallthrough; + case 3: + case 11: + case 16: + case 19: + case 25: + if (IS_ERR_OR_NULL(xceiv)) { + DBG("external transceiver not registered!\n"); + type = "unknown"; + } + break; + case 21: /* internal loopback */ + type = "loopback"; + break; + case 14: /* transceiverless */ + if (cpu_is_omap1710()) + goto bad_on_1710; + fallthrough; + case 13: + case 15: + type = "no"; + break; + + default: +bad_on_1710: + ERR("unrecognized UDC HMC mode %d\n", hmc); + goto cleanup0; + } + } + + INFO("hmc mode %d, %s transceiver\n", hmc, type); + + /* a "gadget" abstracts/virtualizes the controller */ + status = omap_udc_setup(pdev, xceiv); + if (status) + goto cleanup0; + + xceiv = NULL; + /* "udc" is now valid */ + pullup_disable(udc); +#if IS_ENABLED(CONFIG_USB_OHCI_HCD) + udc->gadget.is_otg = (config->otg != 0); +#endif + + /* starting with omap1710 es2.0, clear toggle is a separate bit */ + if (omap_readw(UDC_REV) >= 0x61) + udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE; + else + udc->clr_halt = UDC_RESET_EP; + + /* USB general purpose IRQ: ep0, state changes, dma, etc */ + status = devm_request_irq(&pdev->dev, pdev->resource[1].start, + omap_udc_irq, 0, driver_name, udc); + if (status != 0) { + ERR("can't get irq %d, err %d\n", + (int) pdev->resource[1].start, status); + goto cleanup1; + } + + /* USB "non-iso" IRQ (PIO for all but ep0) */ + status = devm_request_irq(&pdev->dev, pdev->resource[2].start, + omap_udc_pio_irq, 0, "omap_udc pio", udc); + if (status != 0) { + ERR("can't get irq %d, err %d\n", + (int) pdev->resource[2].start, status); + goto cleanup1; + } +#ifdef USE_ISO + status = devm_request_irq(&pdev->dev, pdev->resource[3].start, + omap_udc_iso_irq, 0, "omap_udc iso", udc); + if (status != 0) { + ERR("can't get irq %d, err %d\n", + (int) pdev->resource[3].start, status); + goto cleanup1; + } +#endif + if (cpu_is_omap16xx() || cpu_is_omap7xx()) { + udc->dc_clk = dc_clk; + udc->hhc_clk = hhc_clk; + clk_disable(hhc_clk); + clk_disable(dc_clk); + } + + create_proc_file(); + return usb_add_gadget_udc_release(&pdev->dev, &udc->gadget, + omap_udc_release); + +cleanup1: + kfree(udc); + udc = NULL; + +cleanup0: + if (!IS_ERR_OR_NULL(xceiv)) + usb_put_phy(xceiv); + + if (cpu_is_omap16xx() || cpu_is_omap7xx()) { + clk_disable(hhc_clk); + clk_disable(dc_clk); + clk_put(hhc_clk); + clk_put(dc_clk); + } + + release_mem_region(pdev->resource[0].start, + resource_size(&pdev->resource[0])); + + return status; +} + +static int omap_udc_remove(struct platform_device *pdev) +{ + DECLARE_COMPLETION_ONSTACK(done); + + udc->done = &done; + + usb_del_gadget_udc(&udc->gadget); + + wait_for_completion(&done); + + release_mem_region(pdev->resource[0].start, + resource_size(&pdev->resource[0])); + + return 0; +} + +/* suspend/resume/wakeup from sysfs (echo > power/state) or when the + * system is forced into deep sleep + * + * REVISIT we should probably reject suspend requests when there's a host + * session active, rather than disconnecting, at least on boards that can + * report VBUS irqs (UDC_DEVSTAT.UDC_ATT). And in any case, we need to + * make host resumes and VBUS detection trigger OMAP wakeup events; that + * may involve talking to an external transceiver (e.g. isp1301). + */ + +static int omap_udc_suspend(struct platform_device *dev, pm_message_t message) +{ + u32 devstat; + + devstat = omap_readw(UDC_DEVSTAT); + + /* we're requesting 48 MHz clock if the pullup is enabled + * (== we're attached to the host) and we're not suspended, + * which would prevent entry to deep sleep... + */ + if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) { + WARNING("session active; suspend requires disconnect\n"); + omap_pullup(&udc->gadget, 0); + } + + return 0; +} + +static int omap_udc_resume(struct platform_device *dev) +{ + DBG("resume + wakeup/SRP\n"); + omap_pullup(&udc->gadget, 1); + + /* maybe the host would enumerate us if we nudged it */ + msleep(100); + return omap_wakeup(&udc->gadget); +} + +/*-------------------------------------------------------------------------*/ + +static struct platform_driver udc_driver = { + .probe = omap_udc_probe, + .remove = omap_udc_remove, + .suspend = omap_udc_suspend, + .resume = omap_udc_resume, + .driver = { + .name = driver_name, + }, +}; + +module_platform_driver(udc_driver); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:omap_udc"); |