Add to pxa25x based devices support for USB ethernet gadget. This is a port of pxa25x UDC driver from Linux kernel.
Signed-off-by: Lukasz Dalek luk0104@gmail.com --- drivers/usb/gadget/Makefile | 1 + drivers/usb/gadget/pxa25x_udc.c | 2059 +++++++++++++++++++++++++++++++++++++++ drivers/usb/gadget/pxa25x_udc.h | 162 +++ 3 files changed, 2222 insertions(+), 0 deletions(-) create mode 100644 drivers/usb/gadget/pxa25x_udc.c create mode 100644 drivers/usb/gadget/pxa25x_udc.h
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile index 5bbdd36..040eaba 100644 --- a/drivers/usb/gadget/Makefile +++ b/drivers/usb/gadget/Makefile @@ -36,6 +36,7 @@ ifdef CONFIG_USB_ETHER COBJS-y += ether.o epautoconf.o config.o usbstring.o COBJS-$(CONFIG_USB_ETH_RNDIS) += rndis.o COBJS-$(CONFIG_MV_UDC) += mv_udc.o +COBJS-$(CONFIG_CPU_PXA25X) += pxa25x_udc.o else # Devices not related to the new gadget layer depend on CONFIG_USB_DEVICE ifdef CONFIG_USB_DEVICE diff --git a/drivers/usb/gadget/pxa25x_udc.c b/drivers/usb/gadget/pxa25x_udc.c new file mode 100644 index 0000000..dd74143 --- /dev/null +++ b/drivers/usb/gadget/pxa25x_udc.c @@ -0,0 +1,2059 @@ +/* + * Intel PXA25x and IXP4xx on-chip full speed USB device controllers + * + * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker) + * Copyright (C) 2003 Robert Schwebel, Pengutronix + * Copyright (C) 2003 Benedikt Spranger, Pengutronix + * Copyright (C) 2003 David Brownell + * Copyright (C) 2003 Joshua Wise + * Copyright (C) 2012 Lukasz Dalek luk0104@gmail.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell"); + */ + +#define CONFIG_USB_PXA25X_SMALL +#define DRIVER_NAME "pxa25x_udc_linux" +#define ARCH_HAS_PREFETCH + +#include <common.h> +#include <errno.h> +#include <asm/byteorder.h> +#include <asm/system.h> +#include <asm/mach-types.h> +#include <asm/unaligned.h> +#include <linux/compat.h> +#include <malloc.h> +#include <asm/io.h> +#include <asm/arch/pxa.h> + +#include <usbdescriptors.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <usb/lin_gadget_compat.h> +#include <asm/arch/pxa-regs.h> + +#include "pxa25x_udc.h" + +/* + * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x + * series processors. The UDC for the IXP 4xx series is very similar. + * There are fifteen endpoints, in addition to ep0. + * + * Such controller drivers work with a gadget driver. The gadget driver + * returns descriptors, implements configuration and data protocols used + * by the host to interact with this device, and allocates endpoints to + * the different protocol interfaces. The controller driver virtualizes + * usb hardware so that the gadget drivers will be more portable. + * + * This UDC hardware wants to implement a bit too much USB protocol, so + * it constrains the sorts of USB configuration change events that work. + * The errata for these chips are misleading; some "fixed" bugs from + * pxa250 a0/a1 b0/b1/b2 sure act like they're still there. + * + * Note that the UDC hardware supports DMA (except on IXP) but that's + * not used here. IN-DMA (to host) is simple enough, when the data is + * suitably aligned (16 bytes) ... the network stack doesn't do that, + * other software can. OUT-DMA is buggy in most chip versions, as well + * as poorly designed (data toggle not automatic). So this driver won't + * bother using DMA. (Mostly-working IN-DMA support was available in + * kernels before 2.6.23, but was never enabled or well tested.) + */ + +#define DRIVER_VERSION "18-August-2012" +#define DRIVER_DESC "PXA 25x USB Device Controller driver" + +static const char driver_name[] = "pxa25x_udc"; +static const char ep0name[] = "ep0"; + +/* Watchdog */ +static inline void start_watchdog(struct pxa25x_udc *udc) +{ + debug("Started watchdog\n"); + udc->watchdog.base = get_timer(0); + udc->watchdog.running = 1; +} + +static inline void stop_watchdog(struct pxa25x_udc *udc) +{ + udc->watchdog.running = 0; + debug("Stopped watchdog\n"); +} + +static inline void test_watchdog(struct pxa25x_udc *udc) +{ + if (!udc->watchdog.running) + return; + + debug("watchdog %ld %ld\n", get_timer(udc->watchdog.base), + udc->watchdog.period); + + if (get_timer(udc->watchdog.base) >= udc->watchdog.period) { + stop_watchdog(udc); + udc->watchdog.function(udc); + } +} + +static void udc_watchdog(struct pxa25x_udc *dev) +{ + uint32_t udccs0 = readl(&dev->regs->udccs[0]); + + debug("Fired up udc_watchdog\n"); + + local_irq_disable(); + if (dev->ep0state == EP0_STALL + && (udccs0 & UDCCS0_FST) == 0 + && (udccs0 & UDCCS0_SST) == 0) { + writel(UDCCS0_FST|UDCCS0_FTF, &dev->regs->udccs[0]); + debug("ep0 re-stall\n"); + start_watchdog(dev); + } + local_irq_enable(); +} + +#ifdef DEBUG + +static const char * const state_name[] = { + "EP0_IDLE", + "EP0_IN_DATA_PHASE", "EP0_OUT_DATA_PHASE", + "EP0_END_XFER", "EP0_STALL" +}; + +static void +dump_udccr(const char *label) +{ + u32 udccr = readl(&UDC_REGS->udccr); + debug("%s %02X =%s%s%s%s%s%s%s%s\n", + label, udccr, + (udccr & UDCCR_REM) ? " rem" : "", + (udccr & UDCCR_RSTIR) ? " rstir" : "", + (udccr & UDCCR_SRM) ? " srm" : "", + (udccr & UDCCR_SUSIR) ? " susir" : "", + (udccr & UDCCR_RESIR) ? " resir" : "", + (udccr & UDCCR_RSM) ? " rsm" : "", + (udccr & UDCCR_UDA) ? " uda" : "", + (udccr & UDCCR_UDE) ? " ude" : ""); +} + +static void +dump_udccs0(const char *label) +{ + u32 udccs0 = readl(&UDC_REGS->udccs[0]); + + debug("%s %s %02X =%s%s%s%s%s%s%s%s\n", + label, state_name[the_controller->ep0state], udccs0, + (udccs0 & UDCCS0_SA) ? " sa" : "", + (udccs0 & UDCCS0_RNE) ? " rne" : "", + (udccs0 & UDCCS0_FST) ? " fst" : "", + (udccs0 & UDCCS0_SST) ? " sst" : "", + (udccs0 & UDCCS0_DRWF) ? " dwrf" : "", + (udccs0 & UDCCS0_FTF) ? " ftf" : "", + (udccs0 & UDCCS0_IPR) ? " ipr" : "", + (udccs0 & UDCCS0_OPR) ? " opr" : ""); +} + +static void +dump_state(struct pxa25x_udc *dev) +{ + u32 tmp; + unsigned i; + + debug("%s, uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n", + state_name[dev->ep0state], + readl(&UDC_REGS->uicr1), readl(&UDC_REGS->uicr0), + readl(&UDC_REGS->usir1), readl(&UDC_REGS->usir0), + readl(&UDC_REGS->ufnrh), readl(&UDC_REGS->ufnrl)); + dump_udccr("udccr"); + if (dev->has_cfr) { + tmp = readl(&UDC_REGS->udccfr); + debug("udccfr %02X =%s%s\n", tmp, + (tmp & UDCCFR_AREN) ? " aren" : "", + (tmp & UDCCFR_ACM) ? " acm" : ""); + } + + if (!dev->driver) { + debug("no gadget driver bound\n"); + return; + } else + debug("ep0 driver '%s'\n", "ether"); + + dump_udccs0("udccs0"); + debug("ep0 IN %lu/%lu, OUT %lu/%lu\n", + dev->stats.write.bytes, dev->stats.write.ops, + dev->stats.read.bytes, dev->stats.read.ops); + + for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) { + if (dev->ep[i].desc == NULL) + continue; + debug("udccs%d = %02x\n", i, *dev->ep->reg_udccs); + } +} + +#else /* DEBUG */ + +static inline void dump_udccr(const char *label) { } +static inline void dump_udccs0(const char *label) { } +static inline void dump_state(struct pxa25x_udc *dev) { } + +#endif /* DEBUG */ + +/* + * --------------------------------------------------------------------------- + * endpoint related parts of the api to the usb controller hardware, + * used by gadget driver; and the inner talker-to-hardware core. + * --------------------------------------------------------------------------- + */ + +static void pxa25x_ep_fifo_flush(struct usb_ep *ep); +static void nuke(struct pxa25x_ep *, int status); + +/* one GPIO should control a D+ pullup, so host sees this device (or not) */ +static void pullup_off(void) +{ + struct pxa2xx_udc_mach_info *mach = the_controller->mach; + + if (mach->udc_command) + mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT); +} + +static void pullup_on(void) +{ + struct pxa2xx_udc_mach_info *mach = the_controller->mach; + + if (mach->udc_command) + mach->udc_command(PXA2XX_UDC_CMD_CONNECT); +} + +static void pio_irq_enable(int bEndpointAddress) +{ + bEndpointAddress &= 0xf; + if (bEndpointAddress < 8) { + clrbits_le32(&the_controller->regs->uicr0, + 1 << bEndpointAddress); + } else { + bEndpointAddress -= 8; + clrbits_le32(&the_controller->regs->uicr1, + 1 << bEndpointAddress); + } +} + +static void pio_irq_disable(int bEndpointAddress) +{ + bEndpointAddress &= 0xf; + if (bEndpointAddress < 8) { + setbits_le32(&the_controller->regs->uicr0, + 1 << bEndpointAddress); + } else { + bEndpointAddress -= 8; + setbits_le32(&the_controller->regs->uicr1, + 1 << bEndpointAddress); + } +} + +static inline void udc_set_mask_UDCCR(int mask) +{ + /* + * The UDCCR reg contains mask and interrupt status bits, + * so using '|=' isn't safe as it may ack an interrupt. + */ + const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE; + + mask &= mask_bits; + clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask); +} + +static inline void udc_clear_mask_UDCCR(int mask) +{ + const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE; + + mask = ~mask & mask_bits; + clrbits_le32(&the_controller->regs->udccr, ~mask); +} + +static inline void udc_ack_int_UDCCR(int mask) +{ + const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE; + + mask &= ~mask_bits; + clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask); +} + +/* + * endpoint enable/disable + * + * we need to verify the descriptors used to enable endpoints. since pxa25x + * endpoint configurations are fixed, and are pretty much always enabled, + * there's not a lot to manage here. + * + * because pxa25x can't selectively initialize bulk (or interrupt) endpoints, + * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except + * for a single interface (with only the default altsetting) and for gadget + * drivers that don't halt endpoints (not reset by set_interface). that also + * means that if you use ISO, you must violate the USB spec rule that all + * iso endpoints must be in non-default altsettings. + */ +static int pxa25x_ep_enable(struct usb_ep *_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct pxa25x_ep *ep; + struct pxa25x_udc *dev; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (!_ep || !desc || ep->desc || _ep->name == ep0name + || desc->bDescriptorType != USB_DT_ENDPOINT + || ep->bEndpointAddress != desc->bEndpointAddress + || ep->fifo_size < le16_to_cpu(desc->wMaxPacketSize)) { + printf("%s, bad ep or descriptor\n", __func__); + return -EINVAL; + } + + /* 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) { + printf("%s, %s type mismatch\n", __func__, _ep->name); + return -EINVAL; + } + + /* hardware _could_ do smaller, but driver doesn't */ + if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK + && le16_to_cpu(desc->wMaxPacketSize) + != BULK_FIFO_SIZE) + || !desc->wMaxPacketSize) { + printf("%s, bad %s maxpacket\n", __func__, _ep->name); + return -ERANGE; + } + + dev = ep->dev; + if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { + printf("%s, bogus device state\n", __func__); + return -ESHUTDOWN; + } + + ep->desc = desc; + ep->stopped = 0; + ep->pio_irqs = 0; + ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize); + + /* flush fifo (mostly for OUT buffers) */ + pxa25x_ep_fifo_flush(_ep); + + /* ... reset halt state too, if we could ... */ + + debug("enabled %s\n", _ep->name); + return 0; +} + +static int pxa25x_ep_disable(struct usb_ep *_ep) +{ + struct pxa25x_ep *ep; + unsigned long flags; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (!_ep || !ep->desc) { + printf("%s, %s not enabled\n", __func__, + _ep ? ep->ep.name : NULL); + return -EINVAL; + } + local_irq_save(flags); + + nuke(ep, -ESHUTDOWN); + + /* flush fifo (mostly for IN buffers) */ + pxa25x_ep_fifo_flush(_ep); + + ep->desc = NULL; + ep->stopped = 1; + + local_irq_restore(flags); + debug("%s disabled\n", _ep->name); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +/* + * for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers + * must still pass correctly initialized endpoints, since other controller + * drivers may care about how it's currently set up (dma issues etc). + */ + +/* + * pxa25x_ep_alloc_request - allocate a request data structure + */ +static struct usb_request * +pxa25x_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) +{ + struct pxa25x_request *req; + + req = kzalloc(sizeof(*req), gfp_flags); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + return &req->req; +} + + +/* + * pxa25x_ep_free_request - deallocate a request data structure + */ +static void +pxa25x_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) +{ + struct pxa25x_request *req; + + req = container_of(_req, struct pxa25x_request, req); + WARN_ON(!list_empty(&req->queue)); + kfree(req); +} + +/*-------------------------------------------------------------------------*/ + +/* + * done - retire a request; caller blocked irqs + */ +static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status) +{ + unsigned stopped = ep->stopped; + + list_del_init(&req->queue); + + if (likely(req->req.status == -EINPROGRESS)) + req->req.status = status; + else + status = req->req.status; + + if (status && status != -ESHUTDOWN) + debug("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; + req->req.complete(&ep->ep, &req->req); + ep->stopped = stopped; +} + + +static inline void ep0_idle(struct pxa25x_udc *dev) +{ + dev->ep0state = EP0_IDLE; +} + +static int +write_packet(u32 *uddr, struct pxa25x_request *req, unsigned max) +{ + u8 *buf; + unsigned length, count; + + debug("%s(): uddr %p\n", __func__, uddr); + + buf = req->req.buf + req->req.actual; + prefetch(buf); + + /* how big will this packet be? */ + length = min(req->req.length - req->req.actual, max); + req->req.actual += length; + + count = length; + while (likely(count--)) + writeb(*buf++, uddr); + + return length; +} + +/* + * write to an IN endpoint fifo, as many packets as possible. + * irqs will use this to write the rest later. + * caller guarantees at least one packet buffer is ready (or a zlp). + */ +static int +write_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req) +{ + unsigned max; + + max = le16_to_cpu(ep->desc->wMaxPacketSize); + do { + unsigned count; + int is_last, is_short; + + count = write_packet(ep->reg_uddr, req, max); + + /* last packet is usually short (or a zlp) */ + if (unlikely(count != max)) + is_last = is_short = 1; + else { + if (likely(req->req.length != req->req.actual) + || req->req.zero) + is_last = 0; + else + is_last = 1; + /* interrupt/iso maxpacket may not fill the fifo */ + is_short = unlikely(max < ep->fifo_size); + } + + debug_cond(NOISY, "wrote %s %d bytes%s%s %d left %p\n", + ep->ep.name, count, + is_last ? "/L" : "", is_short ? "/S" : "", + req->req.length - req->req.actual, req); + + /* + * let loose that packet. maybe try writing another one, + * double buffering might work. TSP, TPC, and TFS + * bit values are the same for all normal IN endpoints. + */ + writel(UDCCS_BI_TPC, ep->reg_udccs); + if (is_short) + writel(UDCCS_BI_TSP, ep->reg_udccs); + + /* requests complete when all IN data is in the FIFO */ + if (is_last) { + done(ep, req, 0); + if (list_empty(&ep->queue)) + pio_irq_disable(ep->bEndpointAddress); + return 1; + } + + /* + * TODO experiment: how robust can fifo mode tweaking be? + * double buffering is off in the default fifo mode, which + * prevents TFS from being set here. + */ + + } while (readl(ep->reg_udccs) & UDCCS_BI_TFS); + return 0; +} + +/* + * caller asserts req->pending (ep0 irq status nyet cleared); starts + * ep0 data stage. these chips want very simple state transitions. + */ +static inline +void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag) +{ + writel(flags|UDCCS0_SA|UDCCS0_OPR, &dev->regs->udccs[0]); + writel(USIR0_IR0, &dev->regs->usir0); + dev->req_pending = 0; + debug_cond(NOISY, "%s() %s, udccs0: %02x/%02x usir: %X.%X\n", + __func__, tag, readl(&dev->regs->udccs[0]), flags, + readl(&dev->regs->usir1), readl(&dev->regs->usir0)); +} + +static int +write_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req) +{ + unsigned count; + int is_short; + + count = write_packet(&ep->dev->regs->uddr0, req, EP0_FIFO_SIZE); + ep->dev->stats.write.bytes += count; + + /* last packet "must be" short (or a zlp) */ + is_short = (count != EP0_FIFO_SIZE); + + debug_cond(NOISY, "ep0in %d bytes %d left %p\n", count, + req->req.length - req->req.actual, req); + + if (unlikely(is_short)) { + if (ep->dev->req_pending) + ep0start(ep->dev, UDCCS0_IPR, "short IN"); + else + writel(UDCCS0_IPR, &ep->dev->regs->udccs[0]); + + count = req->req.length; + done(ep, req, 0); + ep0_idle(ep->dev); + + /* + * This seems to get rid of lost status irqs in some cases: + * host responds quickly, or next request involves config + * change automagic, or should have been hidden, or ... + * + * FIXME get rid of all udelays possible... + */ + if (count >= EP0_FIFO_SIZE) { + count = 100; + do { + if ((readl(&ep->dev->regs->udccs[0]) & + UDCCS0_OPR) != 0) { + /* clear OPR, generate ack */ + writel(UDCCS0_OPR, + &ep->dev->regs->udccs[0]); + break; + } + count--; + udelay(1); + } while (count); + } + } else if (ep->dev->req_pending) + ep0start(ep->dev, 0, "IN"); + + return is_short; +} + + +/* + * read_fifo - unload packet(s) from the fifo we use for usb OUT + * transfers and put them into the request. caller should have made + * sure there's at least one packet ready. + * + * returns true if the request completed because of short packet or the + * request buffer having filled (and maybe overran till end-of-packet). + */ +static int +read_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req) +{ + u32 udccs; + u8 *buf; + unsigned bufferspace, count, is_short; + + for (;;) { + /* + * make sure there's a packet in the FIFO. + * UDCCS_{BO,IO}_RPC are all the same bit value. + * UDCCS_{BO,IO}_RNE are all the same bit value. + */ + udccs = readl(ep->reg_udccs); + if (unlikely((udccs & UDCCS_BO_RPC) == 0)) + break; + buf = req->req.buf + req->req.actual; + prefetchw(buf); + bufferspace = req->req.length - req->req.actual; + + /* read all bytes from this packet */ + if (likely(udccs & UDCCS_BO_RNE)) { + count = 1 + (0x0ff & readl(ep->reg_ubcr)); + req->req.actual += min(count, bufferspace); + } else /* zlp */ + count = 0; + is_short = (count < ep->ep.maxpacket); + debug_cond(NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n", + ep->ep.name, udccs, count, + is_short ? "/S" : "", + req, req->req.actual, req->req.length); + while (likely(count-- != 0)) { + u8 byte = readb(ep->reg_uddr); + + if (unlikely(bufferspace == 0)) { + /* + * this happens when the driver's buffer + * is smaller than what the host sent. + * discard the extra data. + */ + if (req->req.status != -EOVERFLOW) + printf("%s overflow %d\n", + ep->ep.name, count); + req->req.status = -EOVERFLOW; + } else { + *buf++ = byte; + bufferspace--; + } + } + writel(UDCCS_BO_RPC, ep->reg_udccs); + /* RPC/RSP/RNE could now reflect the other packet buffer */ + + /* iso is one request per packet */ + if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + if (udccs & UDCCS_IO_ROF) + req->req.status = -EHOSTUNREACH; + /* more like "is_done" */ + is_short = 1; + } + + /* completion */ + if (is_short || req->req.actual == req->req.length) { + done(ep, req, 0); + if (list_empty(&ep->queue)) + pio_irq_disable(ep->bEndpointAddress); + return 1; + } + + /* finished that packet. the next one may be waiting... */ + } + return 0; +} + +/* + * special ep0 version of the above. no UBCR0 or double buffering; status + * handshaking is magic. most device protocols don't need control-OUT. + * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other + * protocols do use them. + */ +static int +read_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req) +{ + u8 *buf, byte; + unsigned bufferspace; + + buf = req->req.buf + req->req.actual; + bufferspace = req->req.length - req->req.actual; + + while (readl(&ep->dev->regs->udccs[0]) & UDCCS0_RNE) { + byte = (u8)readb(&ep->dev->regs->uddr0); + + if (unlikely(bufferspace == 0)) { + /* + * this happens when the driver's buffer + * is smaller than what the host sent. + * discard the extra data. + */ + if (req->req.status != -EOVERFLOW) + printf("%s overflow\n", ep->ep.name); + req->req.status = -EOVERFLOW; + } else { + *buf++ = byte; + req->req.actual++; + bufferspace--; + } + } + + writel(UDCCS0_OPR | UDCCS0_IPR, &ep->dev->regs->udccs[0]); + + /* completion */ + if (req->req.actual >= req->req.length) + return 1; + + /* finished that packet. the next one may be waiting... */ + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static int +pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) +{ + struct pxa25x_request *req; + struct pxa25x_ep *ep; + struct pxa25x_udc *dev; + unsigned long flags; + + req = container_of(_req, struct pxa25x_request, req); + if (unlikely(!_req || !_req->complete || !_req->buf + || !list_empty(&req->queue))) { + printf("%s, bad params\n", __func__); + return -EINVAL; + } + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) { + printf("%s, bad ep\n", __func__); + return -EINVAL; + } + + dev = ep->dev; + if (unlikely(!dev->driver + || dev->gadget.speed == USB_SPEED_UNKNOWN)) { + printf("%s, bogus device state\n", __func__); + return -ESHUTDOWN; + } + + /* + * iso is always one packet per request, that's the only way + * we can report per-packet status. that also helps with dma. + */ + if (unlikely(ep->bmAttributes == USB_ENDPOINT_XFER_ISOC + && req->req.length > + le16_to_cpu(ep->desc->wMaxPacketSize))) + return -EMSGSIZE; + + debug_cond(NOISY, "%s queue req %p, len %d buf %p\n", + _ep->name, _req, _req->length, _req->buf); + + local_irq_save(flags); + + _req->status = -EINPROGRESS; + _req->actual = 0; + + /* kickstart this i/o queue? */ + if (list_empty(&ep->queue) && !ep->stopped) { + if (ep->desc == NULL/* ep0 */) { + unsigned length = _req->length; + + switch (dev->ep0state) { + case EP0_IN_DATA_PHASE: + dev->stats.write.ops++; + if (write_ep0_fifo(ep, req)) + req = NULL; + break; + + case EP0_OUT_DATA_PHASE: + dev->stats.read.ops++; + /* messy ... */ + if (dev->req_config) { + debug("ep0 config ack%s\n", + dev->has_cfr ? "" : " raced"); + if (dev->has_cfr) + writel(UDCCFR_AREN|UDCCFR_ACM + |UDCCFR_MB1, + &ep->dev->regs->udccfr); + done(ep, req, 0); + dev->ep0state = EP0_END_XFER; + local_irq_restore(flags); + return 0; + } + if (dev->req_pending) + ep0start(dev, UDCCS0_IPR, "OUT"); + if (length == 0 || + ((readl( + &ep->dev->regs->udccs[0]) + & UDCCS0_RNE) != 0 + && read_ep0_fifo(ep, req))) { + ep0_idle(dev); + done(ep, req, 0); + req = NULL; + } + break; + + default: + printf("ep0 i/o, odd state %d\n", + dev->ep0state); + local_irq_restore(flags); + return -EL2HLT; + } + /* can the FIFO can satisfy the request immediately? */ + } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) { + if ((readl(ep->reg_udccs) & UDCCS_BI_TFS) != 0 + && write_fifo(ep, req)) + req = NULL; + } else if ((readl(ep->reg_udccs) & UDCCS_BO_RFS) != 0 + && read_fifo(ep, req)) { + req = NULL; + } + + if (likely(req && ep->desc)) + pio_irq_enable(ep->bEndpointAddress); + } + + /* pio or dma irq handler advances the queue. */ + if (likely(req != NULL)) + list_add_tail(&req->queue, &ep->queue); + local_irq_restore(flags); + + return 0; +} + + +/* + * nuke - dequeue ALL requests + */ +static void nuke(struct pxa25x_ep *ep, int status) +{ + struct pxa25x_request *req; + + /* called with irqs blocked */ + while (!list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, + struct pxa25x_request, + queue); + done(ep, req, status); + } + if (ep->desc) + pio_irq_disable(ep->bEndpointAddress); +} + + +/* dequeue JUST ONE request */ +static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct pxa25x_ep *ep; + struct pxa25x_request *req; + unsigned long flags; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (!_ep || ep->ep.name == ep0name) + return -EINVAL; + + local_irq_save(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) { + local_irq_restore(flags); + return -EINVAL; + } + + done(ep, req, -ECONNRESET); + + local_irq_restore(flags); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value) +{ + struct pxa25x_ep *ep; + unsigned long flags; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (unlikely(!_ep + || (!ep->desc && ep->ep.name != ep0name)) + || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + printf("%s, bad ep\n", __func__); + return -EINVAL; + } + if (value == 0) { + /* + * this path (reset toggle+halt) is needed to implement + * SET_INTERFACE on normal hardware. but it can't be + * done from software on the PXA UDC, and the hardware + * forgets to do it as part of SET_INTERFACE automagic. + */ + printf("only host can clear %s halt\n", _ep->name); + return -EROFS; + } + + local_irq_save(flags); + + if ((ep->bEndpointAddress & USB_DIR_IN) != 0 + && ((readl(ep->reg_udccs) & UDCCS_BI_TFS) == 0 + || !list_empty(&ep->queue))) { + local_irq_restore(flags); + return -EAGAIN; + } + + /* FST bit is the same for control, bulk in, bulk out, interrupt in */ + writel(UDCCS_BI_FST|UDCCS_BI_FTF, ep->reg_udccs); + + /* ep0 needs special care */ + if (!ep->desc) { + start_watchdog(ep->dev); + ep->dev->req_pending = 0; + ep->dev->ep0state = EP0_STALL; + + /* and bulk/intr endpoints like dropping stalls too */ + } else { + unsigned i; + for (i = 0; i < 1000; i += 20) { + if (readl(ep->reg_udccs) & UDCCS_BI_SST) + break; + udelay(20); + } + } + local_irq_restore(flags); + + debug("%s halt\n", _ep->name); + return 0; +} + +static int pxa25x_ep_fifo_status(struct usb_ep *_ep) +{ + struct pxa25x_ep *ep; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (!_ep) { + printf("%s, bad ep\n", __func__); + return -ENODEV; + } + /* pxa can't report unclaimed bytes from IN fifos */ + if ((ep->bEndpointAddress & USB_DIR_IN) != 0) + return -EOPNOTSUPP; + if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN + || (readl(ep->reg_udccs) & UDCCS_BO_RFS) == 0) + return 0; + else + return (readl(ep->reg_ubcr) & 0xfff) + 1; +} + +static void pxa25x_ep_fifo_flush(struct usb_ep *_ep) +{ + struct pxa25x_ep *ep; + + ep = container_of(_ep, struct pxa25x_ep, ep); + if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) { + printf("%s, bad ep\n", __func__); + return; + } + + /* toggle and halt bits stay unchanged */ + + /* for OUT, just read and discard the FIFO contents. */ + if ((ep->bEndpointAddress & USB_DIR_IN) == 0) { + while (((readl(ep->reg_udccs)) & UDCCS_BO_RNE) != 0) + (void)readb(ep->reg_uddr); + return; + } + + /* most IN status is the same, but ISO can't stall */ + writel(UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR + | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC + ? 0 : UDCCS_BI_SST), ep->reg_udccs); +} + + +static struct usb_ep_ops pxa25x_ep_ops = { + .enable = pxa25x_ep_enable, + .disable = pxa25x_ep_disable, + + .alloc_request = pxa25x_ep_alloc_request, + .free_request = pxa25x_ep_free_request, + + .queue = pxa25x_ep_queue, + .dequeue = pxa25x_ep_dequeue, + + .set_halt = pxa25x_ep_set_halt, + .fifo_status = pxa25x_ep_fifo_status, + .fifo_flush = pxa25x_ep_fifo_flush, +}; + + +/* --------------------------------------------------------------------------- + * device-scoped parts of the api to the usb controller hardware + * --------------------------------------------------------------------------- + */ + +static int pxa25x_udc_get_frame(struct usb_gadget *_gadget) +{ + return ((readl(&the_controller->regs->ufnrh) & 0x07) << 8) | + (readl(&the_controller->regs->ufnrl) & 0xff); +} + +static int pxa25x_udc_wakeup(struct usb_gadget *_gadget) +{ + /* host may not have enabled remote wakeup */ + if ((readl(&the_controller->regs->udccs[0]) & UDCCS0_DRWF) == 0) + return -EHOSTUNREACH; + udc_set_mask_UDCCR(UDCCR_RSM); + return 0; +} + +static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *); +static void udc_enable(struct pxa25x_udc *); +static void udc_disable(struct pxa25x_udc *); + +/* + * We disable the UDC -- and its 48 MHz clock -- whenever it's not + * in active use. + */ +static int pullup(struct pxa25x_udc *udc) +{ + if (udc->pullup) + pullup_on(); + else + pullup_off(); + + + int is_active = udc->pullup; + if (is_active) { + if (!udc->active) { + udc->active = 1; + udc_enable(udc); + } + } else { + if (udc->active) { + if (udc->gadget.speed != USB_SPEED_UNKNOWN) + stop_activity(udc, udc->driver); + udc_disable(udc); + udc->active = 0; + } + + } + return 0; +} + +/* VBUS reporting logically comes from a transceiver */ +static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active) +{ + struct pxa25x_udc *udc; + + udc = container_of(_gadget, struct pxa25x_udc, gadget); + printf("vbus %s\n", is_active ? "supplied" : "inactive"); + pullup(udc); + return 0; +} + +/* drivers may have software control over D+ pullup */ +static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active) +{ + struct pxa25x_udc *udc; + + udc = container_of(_gadget, struct pxa25x_udc, gadget); + + /* not all boards support pullup control */ + if (!udc->mach->udc_command) + return -EOPNOTSUPP; + + udc->pullup = (is_active != 0); + pullup(udc); + return 0; +} + +/* + * boards may consume current from VBUS, up to 100-500mA based on config. + * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs + * violate USB specs. + */ +static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA) +{ + return -EOPNOTSUPP; +} + +static const struct usb_gadget_ops pxa25x_udc_ops = { + .get_frame = pxa25x_udc_get_frame, + .wakeup = pxa25x_udc_wakeup, + .vbus_session = pxa25x_udc_vbus_session, + .pullup = pxa25x_udc_pullup, + .vbus_draw = pxa25x_udc_vbus_draw, +}; + +/*-------------------------------------------------------------------------*/ + +/* + * udc_disable - disable USB device controller + */ +static void udc_disable(struct pxa25x_udc *dev) +{ + /* block all irqs */ + udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM); + writel(0xff, &dev->regs->uicr0); + writel(0xff, &dev->regs->uicr1); + writel(UFNRH_SIM, &dev->regs->ufnrh); + + /* if hardware supports it, disconnect from usb */ + pullup_off(); + + udc_clear_mask_UDCCR(UDCCR_UDE); + + ep0_idle(dev); + dev->gadget.speed = USB_SPEED_UNKNOWN; +} + +/* + * udc_reinit - initialize software state + */ +static void udc_reinit(struct pxa25x_udc *dev) +{ + u32 i; + + /* device/ep0 records init */ + INIT_LIST_HEAD(&dev->gadget.ep_list); + INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); + dev->ep0state = EP0_IDLE; + + /* basic endpoint records init */ + for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { + struct pxa25x_ep *ep = &dev->ep[i]; + + if (i != 0) + list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list); + + ep->desc = NULL; + ep->stopped = 0; + INIT_LIST_HEAD(&ep->queue); + ep->pio_irqs = 0; + } + + /* the rest was statically initialized, and is read-only */ +} + +/* + * until it's enabled, this UDC should be completely invisible + * to any USB host. + */ +static void udc_enable(struct pxa25x_udc *dev) +{ + debug("udc: enabling udc\n"); + + udc_clear_mask_UDCCR(UDCCR_UDE); + + /* + * Try to clear these bits before we enable the udc. + * Do not touch reset ack bit, we would take care of it in + * interrupt handle routine + */ + udc_ack_int_UDCCR(UDCCR_SUSIR|UDCCR_RESIR); + + ep0_idle(dev); + dev->gadget.speed = USB_SPEED_UNKNOWN; + dev->stats.irqs = 0; + + /* + * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual: + * - enable UDC + * - if RESET is already in progress, ack interrupt + * - unmask reset interrupt + */ + udc_set_mask_UDCCR(UDCCR_UDE); + if (!(readl(&dev->regs->udccr) & UDCCR_UDA)) + udc_ack_int_UDCCR(UDCCR_RSTIR); + + if (dev->has_cfr /* UDC_RES2 is defined */) { + /* + * pxa255 (a0+) can avoid a set_config race that could + * prevent gadget drivers from configuring correctly + */ + writel(UDCCFR_ACM | UDCCFR_MB1, &dev->regs->udccfr); + } + + /* enable suspend/resume and reset irqs */ + udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM); + + /* enable ep0 irqs */ + clrbits_le32(&dev->regs->uicr0, UICR0_IM0); + + /* if hardware supports it, pullup D+ and wait for reset */ + pullup_on(); +} + +static inline void clear_ep_state(struct pxa25x_udc *dev) +{ + unsigned i; + + /* + * hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint + * fifos, and pending transactions mustn't be continued in any case. + */ + for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) + nuke(&dev->ep[i], -ECONNABORTED); +} + +static void handle_ep0(struct pxa25x_udc *dev) +{ + u32 udccs0 = readl(&dev->regs->udccs[0]); + struct pxa25x_ep *ep = &dev->ep[0]; + struct pxa25x_request *req; + union { + struct usb_ctrlrequest r; + u8 raw[8]; + u32 word[2]; + } u; + + if (list_empty(&ep->queue)) + req = NULL; + else + req = list_entry(ep->queue.next, struct pxa25x_request, queue); + + /* clear stall status */ + if (udccs0 & UDCCS0_SST) { + nuke(ep, -EPIPE); + writel(UDCCS0_SST, &dev->regs->udccs[0]); + stop_watchdog(dev); + ep0_idle(dev); + } + + /* previous request unfinished? non-error iff back-to-back ... */ + if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) { + nuke(ep, 0); + stop_watchdog(dev); + ep0_idle(dev); + } + + switch (dev->ep0state) { + case EP0_IDLE: + /* late-breaking status? */ + udccs0 = readl(&dev->regs->udccs[0]); + + /* start control request? */ + if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE)) + == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) { + int i; + + nuke(ep, -EPROTO); + + /* read SETUP packet */ + for (i = 0; i < 8; i++) { + if (unlikely(!(readl(&dev->regs->udccs[0]) & + UDCCS0_RNE))) { +bad_setup: + debug("SETUP %d!\n", i); + goto stall; + } + u.raw[i] = (u8)readb(&dev->regs->uddr0); + } + if (unlikely((readl(&dev->regs->udccs[0]) & + UDCCS0_RNE) != 0)) + goto bad_setup; + +got_setup: + debug("SETUP %02x.%02x v%04x i%04x l%04x\n", + u.r.bRequestType, u.r.bRequest, + le16_to_cpu(u.r.wValue), + le16_to_cpu(u.r.wIndex), + le16_to_cpu(u.r.wLength)); + + /* cope with automagic for some standard requests. */ + dev->req_std = (u.r.bRequestType & USB_TYPE_MASK) + == USB_TYPE_STANDARD; + dev->req_config = 0; + dev->req_pending = 1; + switch (u.r.bRequest) { + /* hardware restricts gadget drivers here! */ + case USB_REQ_SET_CONFIGURATION: + debug("GOT SET_CONFIGURATION\n"); + if (u.r.bRequestType == USB_RECIP_DEVICE) { + /* + * reflect hardware's automagic + * up to the gadget driver. + */ +config_change: + dev->req_config = 1; + clear_ep_state(dev); + /* + * if !has_cfr, there's no synch + * else use AREN (later) not SA|OPR + * USIR0_IR0 acts edge sensitive + */ + } + break; + /* ... and here, even more ... */ + case USB_REQ_SET_INTERFACE: + if (u.r.bRequestType == USB_RECIP_INTERFACE) { + /* + * udc hardware is broken by design: + * - altsetting may only be zero; + * - hw resets all interfaces' eps; + * - ep reset doesn't include halt(?). + */ + printf("broken set_interface (%d/%d)\n", + le16_to_cpu(u.r.wIndex), + le16_to_cpu(u.r.wValue)); + goto config_change; + } + break; + /* hardware was supposed to hide this */ + case USB_REQ_SET_ADDRESS: + debug("GOT SET ADDRESS\n"); + if (u.r.bRequestType == USB_RECIP_DEVICE) { + ep0start(dev, 0, "address"); + return; + } + break; + } + + if (u.r.bRequestType & USB_DIR_IN) + dev->ep0state = EP0_IN_DATA_PHASE; + else + dev->ep0state = EP0_OUT_DATA_PHASE; + + i = dev->driver->setup(&dev->gadget, &u.r); + if (i < 0) { + /* hardware automagic preventing STALL... */ + if (dev->req_config) { + /* + * hardware sometimes neglects to tell + * tell us about config change events, + * so later ones may fail... + */ + printf("config change %02x fail %d?\n", + u.r.bRequest, i); + return; + /* + * TODO experiment: if has_cfr, + * hardware didn't ACK; maybe we + * could actually STALL! + */ + } + if (0) { +stall: + /* uninitialized when goto stall */ + i = 0; + } + debug("protocol STALL, " + "%02x err %d\n", + readl(&dev->regs->udccs[0]), i); + + /* + * the watchdog timer helps deal with cases + * where udc seems to clear FST wrongly, and + * then NAKs instead of STALLing. + */ + ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall"); + start_watchdog(dev); + dev->ep0state = EP0_STALL; + + /* deferred i/o == no response yet */ + } else if (dev->req_pending) { + if (likely(dev->ep0state == EP0_IN_DATA_PHASE + || dev->req_std || u.r.wLength)) + ep0start(dev, 0, "defer"); + else + ep0start(dev, UDCCS0_IPR, "defer/IPR"); + } + + /* expect at least one data or status stage irq */ + return; + + } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA)) + == (UDCCS0_OPR|UDCCS0_SA))) { + unsigned i; + + /* + * pxa210/250 erratum 131 for B0/B1 says RNE lies. + * still observed on a pxa255 a0. + */ + debug("e131\n"); + nuke(ep, -EPROTO); + + /* read SETUP data, but don't trust it too much */ + for (i = 0; i < 8; i++) + u.raw[i] = (u8)readb(&dev->regs->uddr0); + if ((u.r.bRequestType & USB_RECIP_MASK) + > USB_RECIP_OTHER) + goto stall; + if (u.word[0] == 0 && u.word[1] == 0) + goto stall; + goto got_setup; + } else { + /* + * some random early IRQ: + * - we acked FST + * - IPR cleared + * - OPR got set, without SA (likely status stage) + */ + debug("random IRQ %X %X\n", udccs0, + readl(&dev->regs->udccs[0])); + writel(udccs0 & (UDCCS0_SA|UDCCS0_OPR), + &dev->regs->udccs[0]); + } + break; + case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */ + if (udccs0 & UDCCS0_OPR) { + debug("ep0in premature status\n"); + if (req) + done(ep, req, 0); + ep0_idle(dev); + } else /* irq was IPR clearing */ { + if (req) { + debug("next ep0 in packet\n"); + /* this IN packet might finish the request */ + (void) write_ep0_fifo(ep, req); + } /* else IN token before response was written */ + } + break; + case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */ + if (udccs0 & UDCCS0_OPR) { + if (req) { + /* this OUT packet might finish the request */ + if (read_ep0_fifo(ep, req)) + done(ep, req, 0); + /* else more OUT packets expected */ + } /* else OUT token before read was issued */ + } else /* irq was IPR clearing */ { + debug("ep0out premature status\n"); + if (req) + done(ep, req, 0); + ep0_idle(dev); + } + break; + case EP0_END_XFER: + if (req) + done(ep, req, 0); + /* + * ack control-IN status (maybe in-zlp was skipped) + * also appears after some config change events. + */ + if (udccs0 & UDCCS0_OPR) + writel(UDCCS0_OPR, &dev->regs->udccs[0]); + ep0_idle(dev); + break; + case EP0_STALL: + writel(UDCCS0_FST, &dev->regs->udccs[0]); + break; + } + + writel(USIR0_IR0, &dev->regs->usir0); +} + +static void handle_ep(struct pxa25x_ep *ep) +{ + struct pxa25x_request *req; + int is_in = ep->bEndpointAddress & USB_DIR_IN; + int completed; + u32 udccs, tmp; + + do { + completed = 0; + if (likely(!list_empty(&ep->queue))) + req = list_entry(ep->queue.next, + struct pxa25x_request, queue); + else + req = NULL; + + /* TODO check FST handling */ + + udccs = readl(ep->reg_udccs); + if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */ + tmp = UDCCS_BI_TUR; + if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) + tmp |= UDCCS_BI_SST; + tmp &= udccs; + if (likely(tmp)) + writel(tmp, ep->reg_udccs); + if (req && likely((udccs & UDCCS_BI_TFS) != 0)) + completed = write_fifo(ep, req); + + } else { /* irq from RPC (or for ISO, ROF) */ + if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) + tmp = UDCCS_BO_SST | UDCCS_BO_DME; + else + tmp = UDCCS_IO_ROF | UDCCS_IO_DME; + tmp &= udccs; + if (likely(tmp)) + writel(tmp, ep->reg_udccs); + + /* fifos can hold packets, ready for reading... */ + if (likely(req)) + completed = read_fifo(ep, req); + else + pio_irq_disable(ep->bEndpointAddress); + } + ep->pio_irqs++; + } while (completed); +} + +/* + * pxa25x_udc_irq - interrupt handler + * + * avoid delays in ep0 processing. the control handshaking isn't always + * under software control (pxa250c0 and the pxa255 are better), and delays + * could cause usb protocol errors. + */ +static struct pxa25x_udc memory; +static int +pxa25x_udc_irq(void) +{ + struct pxa25x_udc *dev = &memory; + int handled; + + test_watchdog(dev); + + dev->stats.irqs++; + do { + u32 udccr = readl(&dev->regs->udccr); + + handled = 0; + + /* SUSpend Interrupt Request */ + if (unlikely(udccr & UDCCR_SUSIR)) { + udc_ack_int_UDCCR(UDCCR_SUSIR); + handled = 1; + debug("USB suspend\n"); + + if (dev->gadget.speed != USB_SPEED_UNKNOWN + && dev->driver + && dev->driver->suspend) + dev->driver->suspend(&dev->gadget); + ep0_idle(dev); + } + + /* RESume Interrupt Request */ + if (unlikely(udccr & UDCCR_RESIR)) { + udc_ack_int_UDCCR(UDCCR_RESIR); + handled = 1; + debug("USB resume\n"); + + if (dev->gadget.speed != USB_SPEED_UNKNOWN + && dev->driver + && dev->driver->resume) + dev->driver->resume(&dev->gadget); + } + + /* ReSeT Interrupt Request - USB reset */ + if (unlikely(udccr & UDCCR_RSTIR)) { + udc_ack_int_UDCCR(UDCCR_RSTIR); + handled = 1; + + if ((readl(&dev->regs->udccr) & UDCCR_UDA) == 0) { + debug("USB reset start\n"); + + /* + * reset driver and endpoints, + * in case that's not yet done + */ + stop_activity(dev, dev->driver); + + } else { + debug("USB reset end\n"); + dev->gadget.speed = USB_SPEED_FULL; + memset(&dev->stats, 0, sizeof dev->stats); + /* driver and endpoints are still reset */ + } + + } else { + u32 uicr0 = readl(&dev->regs->uicr0); + u32 uicr1 = readl(&dev->regs->uicr1); + u32 usir0 = readl(&dev->regs->usir0); + u32 usir1 = readl(&dev->regs->usir1); + + usir0 = usir0 & ~uicr0; + usir1 = usir1 & ~uicr1; + int i; + + if (unlikely(!usir0 && !usir1)) + continue; + + debug_cond(NOISY, "irq %02x.%02x\n", usir1, usir0); + + /* control traffic */ + if (usir0 & USIR0_IR0) { + dev->ep[0].pio_irqs++; + handle_ep0(dev); + handled = 1; + } + + /* endpoint data transfers */ + for (i = 0; i < 8; i++) { + u32 tmp = 1 << i; + + if (i && (usir0 & tmp)) { + handle_ep(&dev->ep[i]); + setbits_le32(&dev->regs->usir0, tmp); + handled = 1; + } +#ifndef CONFIG_USB_PXA25X_SMALL + if (usir1 & tmp) { + handle_ep(&dev->ep[i+8]); + setbits_le32(&dev->regs->usir1, tmp); + handled = 1; + } +#endif + } + } + + /* we could also ask for 1 msec SOF (SIR) interrupts */ + + } while (handled); + return IRQ_HANDLED; +} + +/*-------------------------------------------------------------------------*/ + +/* + * this uses load-time allocation and initialization (instead of + * doing it at run-time) to save code, eliminate fault paths, and + * be more obviously correct. + */ +static struct pxa25x_udc memory = { + .regs = UDC_REGS, + + .gadget = { + .ops = &pxa25x_udc_ops, + .ep0 = &memory.ep[0].ep, + .name = driver_name, + }, + + /* control endpoint */ + .ep[0] = { + .ep = { + .name = ep0name, + .ops = &pxa25x_ep_ops, + .maxpacket = EP0_FIFO_SIZE, + }, + .dev = &memory, + .reg_udccs = &UDC_REGS->udccs[0], + .reg_uddr = &UDC_REGS->uddr0, + }, + + /* first group of endpoints */ + .ep[1] = { + .ep = { + .name = "ep1in-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 1, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[1], + .reg_uddr = &UDC_REGS->uddr1, + }, + .ep[2] = { + .ep = { + .name = "ep2out-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = 2, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[2], + .reg_ubcr = &UDC_REGS->ubcr2, + .reg_uddr = &UDC_REGS->uddr2, + }, +#ifndef CONFIG_USB_PXA25X_SMALL + .ep[3] = { + .ep = { + .name = "ep3in-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 3, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[3], + .reg_uddr = &UDC_REGS->uddr3, + }, + .ep[4] = { + .ep = { + .name = "ep4out-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = 4, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[4], + .reg_ubcr = &UDC_REGS->ubcr4, + .reg_uddr = &UDC_REGS->uddr4, + }, + .ep[5] = { + .ep = { + .name = "ep5in-int", + .ops = &pxa25x_ep_ops, + .maxpacket = INT_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = INT_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 5, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .reg_udccs = &UDC_REGS->udccs[5], + .reg_uddr = &UDC_REGS->uddr5, + }, + + /* second group of endpoints */ + .ep[6] = { + .ep = { + .name = "ep6in-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 6, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[6], + .reg_uddr = &UDC_REGS->uddr6, + }, + .ep[7] = { + .ep = { + .name = "ep7out-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = 7, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[7], + .reg_ubcr = &UDC_REGS->ubcr7, + .reg_uddr = &UDC_REGS->uddr7, + }, + .ep[8] = { + .ep = { + .name = "ep8in-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 8, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[8], + .reg_uddr = &UDC_REGS->uddr8, + }, + .ep[9] = { + .ep = { + .name = "ep9out-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = 9, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[9], + .reg_ubcr = &UDC_REGS->ubcr9, + .reg_uddr = &UDC_REGS->uddr9, + }, + .ep[10] = { + .ep = { + .name = "ep10in-int", + .ops = &pxa25x_ep_ops, + .maxpacket = INT_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = INT_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 10, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .reg_udccs = &UDC_REGS->udccs[10], + .reg_uddr = &UDC_REGS->uddr10, + }, + + /* third group of endpoints */ + .ep[11] = { + .ep = { + .name = "ep11in-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 11, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[11], + .reg_uddr = &UDC_REGS->uddr11, + }, + .ep[12] = { + .ep = { + .name = "ep12out-bulk", + .ops = &pxa25x_ep_ops, + .maxpacket = BULK_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = BULK_FIFO_SIZE, + .bEndpointAddress = 12, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .reg_udccs = &UDC_REGS->udccs[12], + .reg_ubcr = &UDC_REGS->ubcr12, + .reg_uddr = &UDC_REGS->uddr12, + }, + .ep[13] = { + .ep = { + .name = "ep13in-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 13, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[13], + .reg_uddr = &UDC_REGS->uddr13, + }, + .ep[14] = { + .ep = { + .name = "ep14out-iso", + .ops = &pxa25x_ep_ops, + .maxpacket = ISO_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = ISO_FIFO_SIZE, + .bEndpointAddress = 14, + .bmAttributes = USB_ENDPOINT_XFER_ISOC, + .reg_udccs = &UDC_REGS->udccs[14], + .reg_ubcr = &UDC_REGS->ubcr14, + .reg_uddr = &UDC_REGS->uddr14, + }, + .ep[15] = { + .ep = { + .name = "ep15in-int", + .ops = &pxa25x_ep_ops, + .maxpacket = INT_FIFO_SIZE, + }, + .dev = &memory, + .fifo_size = INT_FIFO_SIZE, + .bEndpointAddress = USB_DIR_IN | 15, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .reg_udccs = &UDC_REGS->udccs[15], + .reg_uddr = &UDC_REGS->uddr15, + }, +#endif /* !CONFIG_USB_PXA25X_SMALL */ +}; + +static void udc_command(int cmd) +{ + switch (cmd) { + case PXA2XX_UDC_CMD_CONNECT: + setbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO), + GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO)); + + /* enable pullup */ + writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), + GPCR(CONFIG_USB_DEV_PULLUP_GPIO)); + + debug("Connected to USB\n"); + break; + + case PXA2XX_UDC_CMD_DISCONNECT: + /* disable pullup resistor */ + writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), + GPSR(CONFIG_USB_DEV_PULLUP_GPIO)); + + /* setup pin as input, line will float */ + clrbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO), + GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO)); + + debug("Disconnected from USB\n"); + break; + } +} + +static struct pxa2xx_udc_mach_info mach_info = { + .udc_command = udc_command, +}; + +/* + * when a driver is successfully registered, it will receive + * control requests including set_configuration(), which enables + * non-control requests. then usb traffic follows until a + * disconnect is reported. then a host may connect again, or + * the driver might get unbound. + */ +int usb_gadget_register_driver(struct usb_gadget_driver *driver) +{ + struct pxa25x_udc *dev = &memory; + int retval; + uint32_t chiprev; + + if (!driver + || driver->speed < USB_SPEED_FULL + || !driver->disconnect + || !driver->setup) + return -EINVAL; + if (!dev) + return -ENODEV; + if (dev->driver) + return -EBUSY; + + /* Enable clock for usb controller */ + setbits_le32(CKEN, CKEN11_USB); + + /* first hook up the driver ... */ + dev->driver = driver; + dev->pullup = 1; + + /* trigger chiprev-specific logic */ + switch ((chiprev = pxa_get_cpu_revision())) { + case PXA255_A0: + dev->has_cfr = 1; + break; + case PXA250_A0: + case PXA250_A1: + /* A0/A1 "not released"; ep 13, 15 unusable */ + /* fall through */ + case PXA250_B2: case PXA210_B2: + case PXA250_B1: case PXA210_B1: + case PXA250_B0: case PXA210_B0: + /* OUT-DMA is broken ... */ + /* fall through */ + case PXA250_C0: case PXA210_C0: + break; + default: + printf("%s: unrecognized processor: %08x\n", + DRIVER_NAME, chiprev); + return -ENODEV; + } + + the_controller = dev; + + /* prepare watchdog timer */ + dev->watchdog.running = 0; + dev->watchdog.period = 5000 * CONFIG_SYS_HZ / 1000000; /* 5 ms */ + dev->watchdog.function = udc_watchdog; + + udc_disable(dev); + udc_reinit(dev); + + dev->mach = &mach_info; + + dev->gadget.name = "pxa2xx_udc"; + retval = driver->bind(&dev->gadget); + if (retval) { + printf("bind to driver %s --> error %d\n", + DRIVER_NAME, retval); + dev->driver = NULL; + return retval; + } + + /* + * ... then enable host detection and ep0; and we're ready + * for set_configuration as well as eventual disconnect. + */ + printf("registered gadget driver '%s'\n", DRIVER_NAME); + + pullup(dev); + dump_state(dev); + return 0; +} + +static void +stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver) +{ + int i; + + /* don't disconnect drivers more than once */ + if (dev->gadget.speed == USB_SPEED_UNKNOWN) + driver = NULL; + dev->gadget.speed = USB_SPEED_UNKNOWN; + + /* prevent new request submissions, kill any outstanding requests */ + for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { + struct pxa25x_ep *ep = &dev->ep[i]; + + ep->stopped = 1; + nuke(ep, -ESHUTDOWN); + } + stop_watchdog(dev); + + /* report disconnect; the driver is already quiesced */ + if (driver) + driver->disconnect(&dev->gadget); + + /* re-init driver-visible data structures */ + udc_reinit(dev); +} + +int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) +{ + struct pxa25x_udc *dev = the_controller; + + if (!dev) + return -ENODEV; + if (!driver || driver != dev->driver || !driver->unbind) + return -EINVAL; + + local_irq_disable(); + dev->pullup = 0; + pullup(dev); + stop_activity(dev, driver); + local_irq_enable(); + + driver->unbind(&dev->gadget); + dev->driver = NULL; + + printf("unregistered gadget driver '%s'\n", DRIVER_NAME); + dump_state(dev); + + the_controller = NULL; + + clrbits_le32(CKEN, CKEN11_USB); + + return 0; +} + +extern void udc_disconnect(void) +{ + setbits_le32(CKEN, CKEN11_USB); + udc_clear_mask_UDCCR(UDCCR_UDE); + udc_command(PXA2XX_UDC_CMD_DISCONNECT); + clrbits_le32(CKEN, CKEN11_USB); +} + +/*-------------------------------------------------------------------------*/ + +extern int +usb_gadget_handle_interrupts(void) +{ + return pxa25x_udc_irq(); +} diff --git a/drivers/usb/gadget/pxa25x_udc.h b/drivers/usb/gadget/pxa25x_udc.h new file mode 100644 index 0000000..de28a69 --- /dev/null +++ b/drivers/usb/gadget/pxa25x_udc.h @@ -0,0 +1,162 @@ +/* + * Intel PXA25x on-chip full speed USB device controller + * + * Copyright (C) 2003 Robert Schwebel r.schwebel@pengutronix.de, Pengutronix + * Copyright (C) 2003 David Brownell + * Copyright (C) 2012 Lukasz Dalek luk0104@gmail.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __LINUX_USB_GADGET_PXA25X_H +#define __LINUX_USB_GADGET_PXA25X_H + +#include <linux/types.h> +#include <asm/arch/regs-usb.h> + +/* + * Prefetching support - only ARMv5. + */ + +#ifdef ARCH_HAS_PREFETCH +static inline void prefetch(const void *ptr) +{ + __asm__ __volatile__( + "pld\t%a0" + : + : "p" (ptr) + : "cc"); +} + +#define prefetchw(ptr) prefetch(ptr) +#endif /* ARCH_HAS_PREFETCH */ + +/*-------------------------------------------------------------------------*/ + +#define UDC_REGS ((struct pxa25x_udc_regs *)PXA25X_UDC_BASE) + +/*-------------------------------------------------------------------------*/ + +struct pxa2xx_udc_mach_info { + int (*udc_is_connected)(void); /* do we see host? */ + void (*udc_command)(int cmd); +#define PXA2XX_UDC_CMD_CONNECT 0 /* let host see us */ +#define PXA2XX_UDC_CMD_DISCONNECT 1 /* so host won't see us */ +}; + +struct pxa25x_udc; + +struct pxa25x_ep { + struct usb_ep ep; + struct pxa25x_udc *dev; + + const struct usb_endpoint_descriptor *desc; + struct list_head queue; + unsigned long pio_irqs; + + unsigned short fifo_size; + u8 bEndpointAddress; + u8 bmAttributes; + + unsigned stopped:1; + + /* UDCCS = UDC Control/Status for this EP + * UBCR = UDC Byte Count Remaining (contents of OUT fifo) + * UDDR = UDC Endpoint Data Register (the fifo) + * DRCM = DMA Request Channel Map + */ + u32 *reg_udccs; + u32 *reg_ubcr; + u32 *reg_uddr; +}; + +struct pxa25x_request { + struct usb_request req; + struct list_head queue; +}; + +enum ep0_state { + EP0_IDLE, + EP0_IN_DATA_PHASE, + EP0_OUT_DATA_PHASE, + EP0_END_XFER, + EP0_STALL, +}; + +#define EP0_FIFO_SIZE 16U +#define BULK_FIFO_SIZE 64U +#define ISO_FIFO_SIZE 256U +#define INT_FIFO_SIZE 8U + +struct udc_stats { + struct ep0stats { + unsigned long ops; + unsigned long bytes; + } read, write; + unsigned long irqs; +}; + +#ifdef CONFIG_USB_PXA25X_SMALL +/* when memory's tight, SMALL config saves code+data. */ +#define PXA_UDC_NUM_ENDPOINTS 3 +#endif + +#ifndef PXA_UDC_NUM_ENDPOINTS +#define PXA_UDC_NUM_ENDPOINTS 16 +#endif + +struct pxa25x_watchdog { + unsigned running:1; + ulong period; + ulong base; + struct pxa25x_udc *udc; + + void (*function)(struct pxa25x_udc *udc); +}; + +struct pxa25x_udc { + struct usb_gadget gadget; + struct usb_gadget_driver *driver; + struct pxa25x_udc_regs *regs; + + enum ep0_state ep0state; + struct udc_stats stats; + unsigned got_irq:1, + pullup:1, + has_cfr:1, + req_pending:1, + req_std:1, + req_config:1, + active:1; + + struct clk *clk; + struct pxa2xx_udc_mach_info *mach; + u64 dma_mask; + struct pxa25x_ep ep[PXA_UDC_NUM_ENDPOINTS]; + + struct pxa25x_watchdog watchdog; +}; + +/*-------------------------------------------------------------------------*/ + +static struct pxa25x_udc *the_controller; + +/*-------------------------------------------------------------------------*/ + +#ifndef DEBUG +# define NOISY 0 +#endif + +#endif /* __LINUX_USB_GADGET_PXA25X_H */