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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/gadget/udc/pxa27x_udc.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/gadget/udc/pxa27x_udc.c')
-rw-r--r--drivers/usb/gadget/udc/pxa27x_udc.c2562
1 files changed, 2562 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/pxa27x_udc.c
new file mode 100644
index 000000000..0ecdfd2ba
--- /dev/null
+++ b/drivers/usb/gadget/udc/pxa27x_udc.c
@@ -0,0 +1,2562 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Handles the Intel 27x USB Device Controller (UDC)
+ *
+ * Inspired by original driver by Frank Becker, David Brownell, and others.
+ * Copyright (C) 2008 Robert Jarzmik
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/slab.h>
+#include <linux/prefetch.h>
+#include <linux/byteorder/generic.h>
+#include <linux/platform_data/pxa2xx_udc.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/phy.h>
+
+#include "pxa27x_udc.h"
+
+/*
+ * This driver handles the USB Device Controller (UDC) in Intel's PXA 27x
+ * series processors.
+ *
+ * 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. The
+ * biggest issues are: that the endpoints have to be set up before the
+ * controller can be enabled (minor, and not uncommon); and each endpoint
+ * can only have one configuration, interface and alternative interface
+ * number (major, and very unusual). Once set up, these cannot be changed
+ * without a controller reset.
+ *
+ * The workaround is to setup all combinations necessary for the gadgets which
+ * will work with this driver. This is done in pxa_udc structure, statically.
+ * See pxa_udc, udc_usb_ep versus pxa_ep, and matching function find_pxa_ep.
+ * (You could modify this if needed. Some drivers have a "fifo_mode" module
+ * parameter to facilitate such changes.)
+ *
+ * The combinations have been tested with these gadgets :
+ * - zero gadget
+ * - file storage gadget
+ * - ether gadget
+ *
+ * The driver doesn't use DMA, only IO access and IRQ callbacks. No use is
+ * made of UDC's double buffering either. USB "On-The-Go" is not implemented.
+ *
+ * All the requests are handled the same way :
+ * - the drivers tries to handle the request directly to the IO
+ * - if the IO fifo is not big enough, the remaining is send/received in
+ * interrupt handling.
+ */
+
+#define DRIVER_VERSION "2008-04-18"
+#define DRIVER_DESC "PXA 27x USB Device Controller driver"
+
+static const char driver_name[] = "pxa27x_udc";
+static struct pxa_udc *the_controller;
+
+static void handle_ep(struct pxa_ep *ep);
+
+/*
+ * Debug filesystem
+ */
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/seq_file.h>
+
+static int state_dbg_show(struct seq_file *s, void *p)
+{
+ struct pxa_udc *udc = s->private;
+ u32 tmp;
+
+ if (!udc->driver)
+ return -ENODEV;
+
+ /* basic device status */
+ seq_printf(s, DRIVER_DESC "\n"
+ "%s version: %s\n"
+ "Gadget driver: %s\n",
+ driver_name, DRIVER_VERSION,
+ udc->driver ? udc->driver->driver.name : "(none)");
+
+ tmp = udc_readl(udc, UDCCR);
+ seq_printf(s,
+ "udccr=0x%0x(%s%s%s%s%s%s%s%s%s%s), con=%d,inter=%d,altinter=%d\n",
+ tmp,
+ (tmp & UDCCR_OEN) ? " oen":"",
+ (tmp & UDCCR_AALTHNP) ? " aalthnp":"",
+ (tmp & UDCCR_AHNP) ? " rem" : "",
+ (tmp & UDCCR_BHNP) ? " rstir" : "",
+ (tmp & UDCCR_DWRE) ? " dwre" : "",
+ (tmp & UDCCR_SMAC) ? " smac" : "",
+ (tmp & UDCCR_EMCE) ? " emce" : "",
+ (tmp & UDCCR_UDR) ? " udr" : "",
+ (tmp & UDCCR_UDA) ? " uda" : "",
+ (tmp & UDCCR_UDE) ? " ude" : "",
+ (tmp & UDCCR_ACN) >> UDCCR_ACN_S,
+ (tmp & UDCCR_AIN) >> UDCCR_AIN_S,
+ (tmp & UDCCR_AAISN) >> UDCCR_AAISN_S);
+ /* registers for device and ep0 */
+ seq_printf(s, "udcicr0=0x%08x udcicr1=0x%08x\n",
+ udc_readl(udc, UDCICR0), udc_readl(udc, UDCICR1));
+ seq_printf(s, "udcisr0=0x%08x udcisr1=0x%08x\n",
+ udc_readl(udc, UDCISR0), udc_readl(udc, UDCISR1));
+ seq_printf(s, "udcfnr=%d\n", udc_readl(udc, UDCFNR));
+ seq_printf(s, "irqs: reset=%lu, suspend=%lu, resume=%lu, reconfig=%lu\n",
+ udc->stats.irqs_reset, udc->stats.irqs_suspend,
+ udc->stats.irqs_resume, udc->stats.irqs_reconfig);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(state_dbg);
+
+static int queues_dbg_show(struct seq_file *s, void *p)
+{
+ struct pxa_udc *udc = s->private;
+ struct pxa_ep *ep;
+ struct pxa27x_request *req;
+ int i, maxpkt;
+
+ if (!udc->driver)
+ return -ENODEV;
+
+ /* dump endpoint queues */
+ for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
+ ep = &udc->pxa_ep[i];
+ maxpkt = ep->fifo_size;
+ seq_printf(s, "%-12s max_pkt=%d %s\n",
+ EPNAME(ep), maxpkt, "pio");
+
+ if (list_empty(&ep->queue)) {
+ seq_puts(s, "\t(nothing queued)\n");
+ continue;
+ }
+
+ list_for_each_entry(req, &ep->queue, queue) {
+ seq_printf(s, "\treq %p len %d/%d buf %p\n",
+ &req->req, req->req.actual,
+ req->req.length, req->req.buf);
+ }
+ }
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(queues_dbg);
+
+static int eps_dbg_show(struct seq_file *s, void *p)
+{
+ struct pxa_udc *udc = s->private;
+ struct pxa_ep *ep;
+ int i;
+ u32 tmp;
+
+ if (!udc->driver)
+ return -ENODEV;
+
+ ep = &udc->pxa_ep[0];
+ tmp = udc_ep_readl(ep, UDCCSR);
+ seq_printf(s, "udccsr0=0x%03x(%s%s%s%s%s%s%s)\n",
+ tmp,
+ (tmp & UDCCSR0_SA) ? " sa" : "",
+ (tmp & UDCCSR0_RNE) ? " rne" : "",
+ (tmp & UDCCSR0_FST) ? " fst" : "",
+ (tmp & UDCCSR0_SST) ? " sst" : "",
+ (tmp & UDCCSR0_DME) ? " dme" : "",
+ (tmp & UDCCSR0_IPR) ? " ipr" : "",
+ (tmp & UDCCSR0_OPC) ? " opc" : "");
+ for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
+ ep = &udc->pxa_ep[i];
+ tmp = i? udc_ep_readl(ep, UDCCR) : udc_readl(udc, UDCCR);
+ seq_printf(s, "%-12s: IN %lu(%lu reqs), OUT %lu(%lu reqs), irqs=%lu, udccr=0x%08x, udccsr=0x%03x, udcbcr=%d\n",
+ EPNAME(ep),
+ ep->stats.in_bytes, ep->stats.in_ops,
+ ep->stats.out_bytes, ep->stats.out_ops,
+ ep->stats.irqs,
+ tmp, udc_ep_readl(ep, UDCCSR),
+ udc_ep_readl(ep, UDCBCR));
+ }
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(eps_dbg);
+
+static void pxa_init_debugfs(struct pxa_udc *udc)
+{
+ struct dentry *root;
+
+ root = debugfs_create_dir(udc->gadget.name, usb_debug_root);
+ debugfs_create_file("udcstate", 0400, root, udc, &state_dbg_fops);
+ debugfs_create_file("queues", 0400, root, udc, &queues_dbg_fops);
+ debugfs_create_file("epstate", 0400, root, udc, &eps_dbg_fops);
+}
+
+static void pxa_cleanup_debugfs(struct pxa_udc *udc)
+{
+ debugfs_lookup_and_remove(udc->gadget.name, usb_debug_root);
+}
+
+#else
+static inline void pxa_init_debugfs(struct pxa_udc *udc)
+{
+}
+
+static inline void pxa_cleanup_debugfs(struct pxa_udc *udc)
+{
+}
+#endif
+
+/**
+ * is_match_usb_pxa - check if usb_ep and pxa_ep match
+ * @udc_usb_ep: usb endpoint
+ * @ep: pxa endpoint
+ * @config: configuration required in pxa_ep
+ * @interface: interface required in pxa_ep
+ * @altsetting: altsetting required in pxa_ep
+ *
+ * Returns 1 if all criteria match between pxa and usb endpoint, 0 otherwise
+ */
+static int is_match_usb_pxa(struct udc_usb_ep *udc_usb_ep, struct pxa_ep *ep,
+ int config, int interface, int altsetting)
+{
+ if (usb_endpoint_num(&udc_usb_ep->desc) != ep->addr)
+ return 0;
+ if (usb_endpoint_dir_in(&udc_usb_ep->desc) != ep->dir_in)
+ return 0;
+ if (usb_endpoint_type(&udc_usb_ep->desc) != ep->type)
+ return 0;
+ if ((ep->config != config) || (ep->interface != interface)
+ || (ep->alternate != altsetting))
+ return 0;
+ return 1;
+}
+
+/**
+ * find_pxa_ep - find pxa_ep structure matching udc_usb_ep
+ * @udc: pxa udc
+ * @udc_usb_ep: udc_usb_ep structure
+ *
+ * Match udc_usb_ep and all pxa_ep available, to see if one matches.
+ * This is necessary because of the strong pxa hardware restriction requiring
+ * that once pxa endpoints are initialized, their configuration is freezed, and
+ * no change can be made to their address, direction, or in which configuration,
+ * interface or altsetting they are active ... which differs from more usual
+ * models which have endpoints be roughly just addressable fifos, and leave
+ * configuration events up to gadget drivers (like all control messages).
+ *
+ * Note that there is still a blurred point here :
+ * - we rely on UDCCR register "active interface" and "active altsetting".
+ * This is a nonsense in regard of USB spec, where multiple interfaces are
+ * active at the same time.
+ * - if we knew for sure that the pxa can handle multiple interface at the
+ * same time, assuming Intel's Developer Guide is wrong, this function
+ * should be reviewed, and a cache of couples (iface, altsetting) should
+ * be kept in the pxa_udc structure. In this case this function would match
+ * against the cache of couples instead of the "last altsetting" set up.
+ *
+ * Returns the matched pxa_ep structure or NULL if none found
+ */
+static struct pxa_ep *find_pxa_ep(struct pxa_udc *udc,
+ struct udc_usb_ep *udc_usb_ep)
+{
+ int i;
+ struct pxa_ep *ep;
+ int cfg = udc->config;
+ int iface = udc->last_interface;
+ int alt = udc->last_alternate;
+
+ if (udc_usb_ep == &udc->udc_usb_ep[0])
+ return &udc->pxa_ep[0];
+
+ for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
+ ep = &udc->pxa_ep[i];
+ if (is_match_usb_pxa(udc_usb_ep, ep, cfg, iface, alt))
+ return ep;
+ }
+ return NULL;
+}
+
+/**
+ * update_pxa_ep_matches - update pxa_ep cached values in all udc_usb_ep
+ * @udc: pxa udc
+ *
+ * Context: interrupt handler
+ *
+ * Updates all pxa_ep fields in udc_usb_ep structures, if this field was
+ * previously set up (and is not NULL). The update is necessary is a
+ * configuration change or altsetting change was issued by the USB host.
+ */
+static void update_pxa_ep_matches(struct pxa_udc *udc)
+{
+ int i;
+ struct udc_usb_ep *udc_usb_ep;
+
+ for (i = 1; i < NR_USB_ENDPOINTS; i++) {
+ udc_usb_ep = &udc->udc_usb_ep[i];
+ if (udc_usb_ep->pxa_ep)
+ udc_usb_ep->pxa_ep = find_pxa_ep(udc, udc_usb_ep);
+ }
+}
+
+/**
+ * pio_irq_enable - Enables irq generation for one endpoint
+ * @ep: udc endpoint
+ */
+static void pio_irq_enable(struct pxa_ep *ep)
+{
+ struct pxa_udc *udc = ep->dev;
+ int index = EPIDX(ep);
+ u32 udcicr0 = udc_readl(udc, UDCICR0);
+ u32 udcicr1 = udc_readl(udc, UDCICR1);
+
+ if (index < 16)
+ udc_writel(udc, UDCICR0, udcicr0 | (3 << (index * 2)));
+ else
+ udc_writel(udc, UDCICR1, udcicr1 | (3 << ((index - 16) * 2)));
+}
+
+/**
+ * pio_irq_disable - Disables irq generation for one endpoint
+ * @ep: udc endpoint
+ */
+static void pio_irq_disable(struct pxa_ep *ep)
+{
+ struct pxa_udc *udc = ep->dev;
+ int index = EPIDX(ep);
+ u32 udcicr0 = udc_readl(udc, UDCICR0);
+ u32 udcicr1 = udc_readl(udc, UDCICR1);
+
+ if (index < 16)
+ udc_writel(udc, UDCICR0, udcicr0 & ~(3 << (index * 2)));
+ else
+ udc_writel(udc, UDCICR1, udcicr1 & ~(3 << ((index - 16) * 2)));
+}
+
+/**
+ * udc_set_mask_UDCCR - set bits in UDCCR
+ * @udc: udc device
+ * @mask: bits to set in UDCCR
+ *
+ * Sets bits in UDCCR, leaving DME and FST bits as they were.
+ */
+static inline void udc_set_mask_UDCCR(struct pxa_udc *udc, int mask)
+{
+ u32 udccr = udc_readl(udc, UDCCR);
+ udc_writel(udc, UDCCR,
+ (udccr & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS));
+}
+
+/**
+ * udc_clear_mask_UDCCR - clears bits in UDCCR
+ * @udc: udc device
+ * @mask: bit to clear in UDCCR
+ *
+ * Clears bits in UDCCR, leaving DME and FST bits as they were.
+ */
+static inline void udc_clear_mask_UDCCR(struct pxa_udc *udc, int mask)
+{
+ u32 udccr = udc_readl(udc, UDCCR);
+ udc_writel(udc, UDCCR,
+ (udccr & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS));
+}
+
+/**
+ * ep_write_UDCCSR - set bits in UDCCSR
+ * @ep: udc endpoint
+ * @mask: bits to set in UDCCR
+ *
+ * Sets bits in UDCCSR (UDCCSR0 and UDCCSR*).
+ *
+ * A specific case is applied to ep0 : the ACM bit is always set to 1, for
+ * SET_INTERFACE and SET_CONFIGURATION.
+ */
+static inline void ep_write_UDCCSR(struct pxa_ep *ep, int mask)
+{
+ if (is_ep0(ep))
+ mask |= UDCCSR0_ACM;
+ udc_ep_writel(ep, UDCCSR, mask);
+}
+
+/**
+ * ep_count_bytes_remain - get how many bytes in udc endpoint
+ * @ep: udc endpoint
+ *
+ * Returns number of bytes in OUT fifos. Broken for IN fifos (-EOPNOTSUPP)
+ */
+static int ep_count_bytes_remain(struct pxa_ep *ep)
+{
+ if (ep->dir_in)
+ return -EOPNOTSUPP;
+ return udc_ep_readl(ep, UDCBCR) & 0x3ff;
+}
+
+/**
+ * ep_is_empty - checks if ep has byte ready for reading
+ * @ep: udc endpoint
+ *
+ * If endpoint is the control endpoint, checks if there are bytes in the
+ * control endpoint fifo. If endpoint is a data endpoint, checks if bytes
+ * are ready for reading on OUT endpoint.
+ *
+ * Returns 0 if ep not empty, 1 if ep empty, -EOPNOTSUPP if IN endpoint
+ */
+static int ep_is_empty(struct pxa_ep *ep)
+{
+ int ret;
+
+ if (!is_ep0(ep) && ep->dir_in)
+ return -EOPNOTSUPP;
+ if (is_ep0(ep))
+ ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR0_RNE);
+ else
+ ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNE);
+ return ret;
+}
+
+/**
+ * ep_is_full - checks if ep has place to write bytes
+ * @ep: udc endpoint
+ *
+ * If endpoint is not the control endpoint and is an IN endpoint, checks if
+ * there is place to write bytes into the endpoint.
+ *
+ * Returns 0 if ep not full, 1 if ep full, -EOPNOTSUPP if OUT endpoint
+ */
+static int ep_is_full(struct pxa_ep *ep)
+{
+ if (is_ep0(ep))
+ return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_IPR);
+ if (!ep->dir_in)
+ return -EOPNOTSUPP;
+ return (!(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNF));
+}
+
+/**
+ * epout_has_pkt - checks if OUT endpoint fifo has a packet available
+ * @ep: pxa endpoint
+ *
+ * Returns 1 if a complete packet is available, 0 if not, -EOPNOTSUPP for IN ep.
+ */
+static int epout_has_pkt(struct pxa_ep *ep)
+{
+ if (!is_ep0(ep) && ep->dir_in)
+ return -EOPNOTSUPP;
+ if (is_ep0(ep))
+ return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_OPC);
+ return (udc_ep_readl(ep, UDCCSR) & UDCCSR_PC);
+}
+
+/**
+ * set_ep0state - Set ep0 automata state
+ * @udc: udc device
+ * @state: state
+ */
+static void set_ep0state(struct pxa_udc *udc, int state)
+{
+ struct pxa_ep *ep = &udc->pxa_ep[0];
+ char *old_stname = EP0_STNAME(udc);
+
+ udc->ep0state = state;
+ ep_dbg(ep, "state=%s->%s, udccsr0=0x%03x, udcbcr=%d\n", old_stname,
+ EP0_STNAME(udc), udc_ep_readl(ep, UDCCSR),
+ udc_ep_readl(ep, UDCBCR));
+}
+
+/**
+ * ep0_idle - Put control endpoint into idle state
+ * @dev: udc device
+ */
+static void ep0_idle(struct pxa_udc *dev)
+{
+ set_ep0state(dev, WAIT_FOR_SETUP);
+}
+
+/**
+ * inc_ep_stats_reqs - Update ep stats counts
+ * @ep: physical endpoint
+ * @is_in: ep direction (USB_DIR_IN or 0)
+ *
+ */
+static void inc_ep_stats_reqs(struct pxa_ep *ep, int is_in)
+{
+ if (is_in)
+ ep->stats.in_ops++;
+ else
+ ep->stats.out_ops++;
+}
+
+/**
+ * inc_ep_stats_bytes - Update ep stats counts
+ * @ep: physical endpoint
+ * @count: bytes transferred on endpoint
+ * @is_in: ep direction (USB_DIR_IN or 0)
+ */
+static void inc_ep_stats_bytes(struct pxa_ep *ep, int count, int is_in)
+{
+ if (is_in)
+ ep->stats.in_bytes += count;
+ else
+ ep->stats.out_bytes += count;
+}
+
+/**
+ * pxa_ep_setup - Sets up an usb physical endpoint
+ * @ep: pxa27x physical endpoint
+ *
+ * Find the physical pxa27x ep, and setup its UDCCR
+ */
+static void pxa_ep_setup(struct pxa_ep *ep)
+{
+ u32 new_udccr;
+
+ new_udccr = ((ep->config << UDCCONR_CN_S) & UDCCONR_CN)
+ | ((ep->interface << UDCCONR_IN_S) & UDCCONR_IN)
+ | ((ep->alternate << UDCCONR_AISN_S) & UDCCONR_AISN)
+ | ((EPADDR(ep) << UDCCONR_EN_S) & UDCCONR_EN)
+ | ((EPXFERTYPE(ep) << UDCCONR_ET_S) & UDCCONR_ET)
+ | ((ep->dir_in) ? UDCCONR_ED : 0)
+ | ((ep->fifo_size << UDCCONR_MPS_S) & UDCCONR_MPS)
+ | UDCCONR_EE;
+
+ udc_ep_writel(ep, UDCCR, new_udccr);
+}
+
+/**
+ * pxa_eps_setup - Sets up all usb physical endpoints
+ * @dev: udc device
+ *
+ * Setup all pxa physical endpoints, except ep0
+ */
+static void pxa_eps_setup(struct pxa_udc *dev)
+{
+ unsigned int i;
+
+ dev_dbg(dev->dev, "%s: dev=%p\n", __func__, dev);
+
+ for (i = 1; i < NR_PXA_ENDPOINTS; i++)
+ pxa_ep_setup(&dev->pxa_ep[i]);
+}
+
+/**
+ * pxa_ep_alloc_request - Allocate usb request
+ * @_ep: usb endpoint
+ * @gfp_flags:
+ *
+ * For the pxa27x, 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).
+ */
+static struct usb_request *
+pxa_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
+{
+ struct pxa27x_request *req;
+
+ req = kzalloc(sizeof *req, gfp_flags);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->queue);
+ req->in_use = 0;
+ req->udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+
+ return &req->req;
+}
+
+/**
+ * pxa_ep_free_request - Free usb request
+ * @_ep: usb endpoint
+ * @_req: usb request
+ *
+ * Wrapper around kfree to free _req
+ */
+static void pxa_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct pxa27x_request *req;
+
+ req = container_of(_req, struct pxa27x_request, req);
+ WARN_ON(!list_empty(&req->queue));
+ kfree(req);
+}
+
+/**
+ * ep_add_request - add a request to the endpoint's queue
+ * @ep: usb endpoint
+ * @req: usb request
+ *
+ * Context: ep->lock held
+ *
+ * Queues the request in the endpoint's queue, and enables the interrupts
+ * on the endpoint.
+ */
+static void ep_add_request(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ if (unlikely(!req))
+ return;
+ ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
+ req->req.length, udc_ep_readl(ep, UDCCSR));
+
+ req->in_use = 1;
+ list_add_tail(&req->queue, &ep->queue);
+ pio_irq_enable(ep);
+}
+
+/**
+ * ep_del_request - removes a request from the endpoint's queue
+ * @ep: usb endpoint
+ * @req: usb request
+ *
+ * Context: ep->lock held
+ *
+ * Unqueue the request from the endpoint's queue. If there are no more requests
+ * on the endpoint, and if it's not the control endpoint, interrupts are
+ * disabled on the endpoint.
+ */
+static void ep_del_request(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ if (unlikely(!req))
+ return;
+ ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
+ req->req.length, udc_ep_readl(ep, UDCCSR));
+
+ list_del_init(&req->queue);
+ req->in_use = 0;
+ if (!is_ep0(ep) && list_empty(&ep->queue))
+ pio_irq_disable(ep);
+}
+
+/**
+ * req_done - Complete an usb request
+ * @ep: pxa physical endpoint
+ * @req: pxa request
+ * @status: usb request status sent to gadget API
+ * @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
+ *
+ * Context: ep->lock held if flags not NULL, else ep->lock released
+ *
+ * Retire a pxa27x usb request. Endpoint must be locked.
+ */
+static void req_done(struct pxa_ep *ep, struct pxa27x_request *req, int status,
+ unsigned long *pflags)
+{
+ unsigned long flags;
+
+ ep_del_request(ep, req);
+ if (likely(req->req.status == -EINPROGRESS))
+ req->req.status = status;
+ else
+ status = req->req.status;
+
+ if (status && status != -ESHUTDOWN)
+ ep_dbg(ep, "complete req %p stat %d len %u/%u\n",
+ &req->req, status,
+ req->req.actual, req->req.length);
+
+ if (pflags)
+ spin_unlock_irqrestore(&ep->lock, *pflags);
+ local_irq_save(flags);
+ usb_gadget_giveback_request(&req->udc_usb_ep->usb_ep, &req->req);
+ local_irq_restore(flags);
+ if (pflags)
+ spin_lock_irqsave(&ep->lock, *pflags);
+}
+
+/**
+ * ep_end_out_req - Ends endpoint OUT request
+ * @ep: physical endpoint
+ * @req: pxa request
+ * @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
+ *
+ * Context: ep->lock held or released (see req_done())
+ *
+ * Ends endpoint OUT request (completes usb request).
+ */
+static void ep_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
+ unsigned long *pflags)
+{
+ inc_ep_stats_reqs(ep, !USB_DIR_IN);
+ req_done(ep, req, 0, pflags);
+}
+
+/**
+ * ep0_end_out_req - Ends control endpoint OUT request (ends data stage)
+ * @ep: physical endpoint
+ * @req: pxa request
+ * @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
+ *
+ * Context: ep->lock held or released (see req_done())
+ *
+ * Ends control endpoint OUT request (completes usb request), and puts
+ * control endpoint into idle state
+ */
+static void ep0_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
+ unsigned long *pflags)
+{
+ set_ep0state(ep->dev, OUT_STATUS_STAGE);
+ ep_end_out_req(ep, req, pflags);
+ ep0_idle(ep->dev);
+}
+
+/**
+ * ep_end_in_req - Ends endpoint IN request
+ * @ep: physical endpoint
+ * @req: pxa request
+ * @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
+ *
+ * Context: ep->lock held or released (see req_done())
+ *
+ * Ends endpoint IN request (completes usb request).
+ */
+static void ep_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
+ unsigned long *pflags)
+{
+ inc_ep_stats_reqs(ep, USB_DIR_IN);
+ req_done(ep, req, 0, pflags);
+}
+
+/**
+ * ep0_end_in_req - Ends control endpoint IN request (ends data stage)
+ * @ep: physical endpoint
+ * @req: pxa request
+ * @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
+ *
+ * Context: ep->lock held or released (see req_done())
+ *
+ * Ends control endpoint IN request (completes usb request), and puts
+ * control endpoint into status state
+ */
+static void ep0_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
+ unsigned long *pflags)
+{
+ set_ep0state(ep->dev, IN_STATUS_STAGE);
+ ep_end_in_req(ep, req, pflags);
+}
+
+/**
+ * nuke - Dequeue all requests
+ * @ep: pxa endpoint
+ * @status: usb request status
+ *
+ * Context: ep->lock released
+ *
+ * Dequeues all requests on an endpoint. As a side effect, interrupts will be
+ * disabled on that endpoint (because no more requests).
+ */
+static void nuke(struct pxa_ep *ep, int status)
+{
+ struct pxa27x_request *req;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next, struct pxa27x_request, queue);
+ req_done(ep, req, status, &flags);
+ }
+ spin_unlock_irqrestore(&ep->lock, flags);
+}
+
+/**
+ * read_packet - transfer 1 packet from an OUT endpoint into request
+ * @ep: pxa physical endpoint
+ * @req: usb request
+ *
+ * Takes bytes from OUT endpoint and transfers them info the usb request.
+ * If there is less space in request than bytes received in OUT endpoint,
+ * bytes are left in the OUT endpoint.
+ *
+ * Returns how many bytes were actually transferred
+ */
+static int read_packet(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ u32 *buf;
+ int bytes_ep, bufferspace, count, i;
+
+ bytes_ep = ep_count_bytes_remain(ep);
+ bufferspace = req->req.length - req->req.actual;
+
+ buf = (u32 *)(req->req.buf + req->req.actual);
+ prefetchw(buf);
+
+ if (likely(!ep_is_empty(ep)))
+ count = min(bytes_ep, bufferspace);
+ else /* zlp */
+ count = 0;
+
+ for (i = count; i > 0; i -= 4)
+ *buf++ = udc_ep_readl(ep, UDCDR);
+ req->req.actual += count;
+
+ ep_write_UDCCSR(ep, UDCCSR_PC);
+
+ return count;
+}
+
+/**
+ * write_packet - transfer 1 packet from request into an IN endpoint
+ * @ep: pxa physical endpoint
+ * @req: usb request
+ * @max: max bytes that fit into endpoint
+ *
+ * Takes bytes from usb request, and transfers them into the physical
+ * endpoint. If there are no bytes to transfer, doesn't write anything
+ * to physical endpoint.
+ *
+ * Returns how many bytes were actually transferred.
+ */
+static int write_packet(struct pxa_ep *ep, struct pxa27x_request *req,
+ unsigned int max)
+{
+ int length, count, remain, i;
+ u32 *buf;
+ u8 *buf_8;
+
+ buf = (u32 *)(req->req.buf + req->req.actual);
+ prefetch(buf);
+
+ length = min(req->req.length - req->req.actual, max);
+ req->req.actual += length;
+
+ remain = length & 0x3;
+ count = length & ~(0x3);
+ for (i = count; i > 0 ; i -= 4)
+ udc_ep_writel(ep, UDCDR, *buf++);
+
+ buf_8 = (u8 *)buf;
+ for (i = remain; i > 0; i--)
+ udc_ep_writeb(ep, UDCDR, *buf_8++);
+
+ ep_vdbg(ep, "length=%d+%d, udccsr=0x%03x\n", count, remain,
+ udc_ep_readl(ep, UDCCSR));
+
+ return length;
+}
+
+/**
+ * read_fifo - Transfer packets from OUT endpoint into usb request
+ * @ep: pxa physical endpoint
+ * @req: usb request
+ *
+ * Context: interrupt handler
+ *
+ * Unload as many packets as possible 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.
+ * Doesn't complete the request, that's the caller's job
+ *
+ * Returns 1 if the request completed, 0 otherwise
+ */
+static int read_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ int count, is_short, completed = 0;
+
+ while (epout_has_pkt(ep)) {
+ count = read_packet(ep, req);
+ inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
+
+ is_short = (count < ep->fifo_size);
+ ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
+ udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
+ &req->req, req->req.actual, req->req.length);
+
+ /* completion */
+ if (is_short || req->req.actual == req->req.length) {
+ completed = 1;
+ break;
+ }
+ /* finished that packet. the next one may be waiting... */
+ }
+ return completed;
+}
+
+/**
+ * write_fifo - transfer packets from usb request into an IN endpoint
+ * @ep: pxa physical endpoint
+ * @req: pxa usb request
+ *
+ * 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).
+ * Doesn't complete the request, that's the caller's job
+ *
+ * Returns 1 if request fully transferred, 0 if partial transfer
+ */
+static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ unsigned max;
+ int count, is_short, is_last = 0, completed = 0, totcount = 0;
+ u32 udccsr;
+
+ max = ep->fifo_size;
+ do {
+ udccsr = udc_ep_readl(ep, UDCCSR);
+ if (udccsr & UDCCSR_PC) {
+ ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
+ udccsr);
+ ep_write_UDCCSR(ep, UDCCSR_PC);
+ }
+ if (udccsr & UDCCSR_TRN) {
+ ep_vdbg(ep, "Clearing Underrun on, udccsr=%x\n",
+ udccsr);
+ ep_write_UDCCSR(ep, UDCCSR_TRN);
+ }
+
+ count = write_packet(ep, req, max);
+ inc_ep_stats_bytes(ep, count, USB_DIR_IN);
+ totcount += count;
+
+ /* last packet is usually short (or a zlp) */
+ if (unlikely(count < max)) {
+ is_last = 1;
+ 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);
+ }
+
+ if (is_short)
+ ep_write_UDCCSR(ep, UDCCSR_SP);
+
+ /* requests complete when all IN data is in the FIFO */
+ if (is_last) {
+ completed = 1;
+ break;
+ }
+ } while (!ep_is_full(ep));
+
+ ep_dbg(ep, "wrote count:%d bytes%s%s, left:%d req=%p\n",
+ totcount, is_last ? "/L" : "", is_short ? "/S" : "",
+ req->req.length - req->req.actual, &req->req);
+
+ return completed;
+}
+
+/**
+ * read_ep0_fifo - Transfer packets from control endpoint into usb request
+ * @ep: control endpoint
+ * @req: pxa usb request
+ *
+ * Special ep0 version of the above read_fifo. Reads as many bytes from control
+ * endpoint as can be read, and stores them into usb request (limited by request
+ * maximum length).
+ *
+ * Returns 0 if usb request only partially filled, 1 if fully filled
+ */
+static int read_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ int count, is_short, completed = 0;
+
+ while (epout_has_pkt(ep)) {
+ count = read_packet(ep, req);
+ ep_write_UDCCSR(ep, UDCCSR0_OPC);
+ inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
+
+ is_short = (count < ep->fifo_size);
+ ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
+ udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
+ &req->req, req->req.actual, req->req.length);
+
+ if (is_short || req->req.actual >= req->req.length) {
+ completed = 1;
+ break;
+ }
+ }
+
+ return completed;
+}
+
+/**
+ * write_ep0_fifo - Send a request to control endpoint (ep0 in)
+ * @ep: control endpoint
+ * @req: request
+ *
+ * Context: interrupt handler
+ *
+ * Sends a request (or a part of the request) to the control endpoint (ep0 in).
+ * If the request doesn't fit, the remaining part will be sent from irq.
+ * The request is considered fully written only if either :
+ * - last write transferred all remaining bytes, but fifo was not fully filled
+ * - last write was a 0 length write
+ *
+ * Returns 1 if request fully written, 0 if request only partially sent
+ */
+static int write_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
+{
+ unsigned count;
+ int is_last, is_short;
+
+ count = write_packet(ep, req, EP0_FIFO_SIZE);
+ inc_ep_stats_bytes(ep, count, USB_DIR_IN);
+
+ is_short = (count < EP0_FIFO_SIZE);
+ is_last = ((count == 0) || (count < EP0_FIFO_SIZE));
+
+ /* Sends either a short packet or a 0 length packet */
+ if (unlikely(is_short))
+ ep_write_UDCCSR(ep, UDCCSR0_IPR);
+
+ ep_dbg(ep, "in %d bytes%s%s, %d left, req=%p, udccsr0=0x%03x\n",
+ count, is_short ? "/S" : "", is_last ? "/L" : "",
+ req->req.length - req->req.actual,
+ &req->req, udc_ep_readl(ep, UDCCSR));
+
+ return is_last;
+}
+
+/**
+ * pxa_ep_queue - Queue a request into an IN endpoint
+ * @_ep: usb endpoint
+ * @_req: usb request
+ * @gfp_flags: flags
+ *
+ * Context: thread context or from the interrupt handler in the
+ * special case of ep0 setup :
+ * (irq->handle_ep0_ctrl_req->gadget_setup->pxa_ep_queue)
+ *
+ * Returns 0 if succedeed, error otherwise
+ */
+static int pxa_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t gfp_flags)
+{
+ struct udc_usb_ep *udc_usb_ep;
+ struct pxa_ep *ep;
+ struct pxa27x_request *req;
+ struct pxa_udc *dev;
+ unsigned long flags;
+ int rc = 0;
+ int is_first_req;
+ unsigned length;
+ int recursion_detected;
+
+ req = container_of(_req, struct pxa27x_request, req);
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+
+ if (unlikely(!_req || !_req->complete || !_req->buf))
+ return -EINVAL;
+
+ if (unlikely(!_ep))
+ return -EINVAL;
+
+ ep = udc_usb_ep->pxa_ep;
+ if (unlikely(!ep))
+ return -EINVAL;
+
+ dev = ep->dev;
+ if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
+ ep_dbg(ep, "bogus device state\n");
+ 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(EPXFERTYPE_is_ISO(ep)
+ && req->req.length > ep->fifo_size))
+ return -EMSGSIZE;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ recursion_detected = ep->in_handle_ep;
+
+ is_first_req = list_empty(&ep->queue);
+ ep_dbg(ep, "queue req %p(first=%s), len %d buf %p\n",
+ _req, is_first_req ? "yes" : "no",
+ _req->length, _req->buf);
+
+ if (!ep->enabled) {
+ _req->status = -ESHUTDOWN;
+ rc = -ESHUTDOWN;
+ goto out_locked;
+ }
+
+ if (req->in_use) {
+ ep_err(ep, "refusing to queue req %p (already queued)\n", req);
+ goto out_locked;
+ }
+
+ length = _req->length;
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+
+ ep_add_request(ep, req);
+ spin_unlock_irqrestore(&ep->lock, flags);
+
+ if (is_ep0(ep)) {
+ switch (dev->ep0state) {
+ case WAIT_ACK_SET_CONF_INTERF:
+ if (length == 0) {
+ ep_end_in_req(ep, req, NULL);
+ } else {
+ ep_err(ep, "got a request of %d bytes while"
+ "in state WAIT_ACK_SET_CONF_INTERF\n",
+ length);
+ ep_del_request(ep, req);
+ rc = -EL2HLT;
+ }
+ ep0_idle(ep->dev);
+ break;
+ case IN_DATA_STAGE:
+ if (!ep_is_full(ep))
+ if (write_ep0_fifo(ep, req))
+ ep0_end_in_req(ep, req, NULL);
+ break;
+ case OUT_DATA_STAGE:
+ if ((length == 0) || !epout_has_pkt(ep))
+ if (read_ep0_fifo(ep, req))
+ ep0_end_out_req(ep, req, NULL);
+ break;
+ default:
+ ep_err(ep, "odd state %s to send me a request\n",
+ EP0_STNAME(ep->dev));
+ ep_del_request(ep, req);
+ rc = -EL2HLT;
+ break;
+ }
+ } else {
+ if (!recursion_detected)
+ handle_ep(ep);
+ }
+
+out:
+ return rc;
+out_locked:
+ spin_unlock_irqrestore(&ep->lock, flags);
+ goto out;
+}
+
+/**
+ * pxa_ep_dequeue - Dequeue one request
+ * @_ep: usb endpoint
+ * @_req: usb request
+ *
+ * Return 0 if no error, -EINVAL or -ECONNRESET otherwise
+ */
+static int pxa_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+ struct pxa27x_request *req = NULL, *iter;
+ unsigned long flags;
+ int rc = -EINVAL;
+
+ if (!_ep)
+ return rc;
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ ep = udc_usb_ep->pxa_ep;
+ if (!ep || is_ep0(ep))
+ return rc;
+
+ spin_lock_irqsave(&ep->lock, flags);
+
+ /* make sure it's actually queued on this endpoint */
+ list_for_each_entry(iter, &ep->queue, queue) {
+ if (&iter->req != _req)
+ continue;
+ req = iter;
+ rc = 0;
+ break;
+ }
+
+ spin_unlock_irqrestore(&ep->lock, flags);
+ if (!rc)
+ req_done(ep, req, -ECONNRESET, NULL);
+ return rc;
+}
+
+/**
+ * pxa_ep_set_halt - Halts operations on one endpoint
+ * @_ep: usb endpoint
+ * @value:
+ *
+ * Returns 0 if no error, -EINVAL, -EROFS, -EAGAIN otherwise
+ */
+static int pxa_ep_set_halt(struct usb_ep *_ep, int value)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+ unsigned long flags;
+ int rc;
+
+
+ if (!_ep)
+ return -EINVAL;
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ ep = udc_usb_ep->pxa_ep;
+ if (!ep || is_ep0(ep))
+ 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.
+ */
+ ep_dbg(ep, "only host can clear halt\n");
+ return -EROFS;
+ }
+
+ spin_lock_irqsave(&ep->lock, flags);
+
+ rc = -EAGAIN;
+ if (ep->dir_in && (ep_is_full(ep) || !list_empty(&ep->queue)))
+ goto out;
+
+ /* FST, FEF bits are the same for control and non control endpoints */
+ rc = 0;
+ ep_write_UDCCSR(ep, UDCCSR_FST | UDCCSR_FEF);
+ if (is_ep0(ep))
+ set_ep0state(ep->dev, STALL);
+
+out:
+ spin_unlock_irqrestore(&ep->lock, flags);
+ return rc;
+}
+
+/**
+ * pxa_ep_fifo_status - Get how many bytes in physical endpoint
+ * @_ep: usb endpoint
+ *
+ * Returns number of bytes in OUT fifos. Broken for IN fifos.
+ */
+static int pxa_ep_fifo_status(struct usb_ep *_ep)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+
+ if (!_ep)
+ return -ENODEV;
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ ep = udc_usb_ep->pxa_ep;
+ if (!ep || is_ep0(ep))
+ return -ENODEV;
+
+ if (ep->dir_in)
+ return -EOPNOTSUPP;
+ if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN || ep_is_empty(ep))
+ return 0;
+ else
+ return ep_count_bytes_remain(ep) + 1;
+}
+
+/**
+ * pxa_ep_fifo_flush - Flushes one endpoint
+ * @_ep: usb endpoint
+ *
+ * Discards all data in one endpoint(IN or OUT), except control endpoint.
+ */
+static void pxa_ep_fifo_flush(struct usb_ep *_ep)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+ unsigned long flags;
+
+ if (!_ep)
+ return;
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ ep = udc_usb_ep->pxa_ep;
+ if (!ep || is_ep0(ep))
+ return;
+
+ spin_lock_irqsave(&ep->lock, flags);
+
+ if (unlikely(!list_empty(&ep->queue)))
+ ep_dbg(ep, "called while queue list not empty\n");
+ ep_dbg(ep, "called\n");
+
+ /* for OUT, just read and discard the FIFO contents. */
+ if (!ep->dir_in) {
+ while (!ep_is_empty(ep))
+ udc_ep_readl(ep, UDCDR);
+ } else {
+ /* most IN status is the same, but ISO can't stall */
+ ep_write_UDCCSR(ep,
+ UDCCSR_PC | UDCCSR_FEF | UDCCSR_TRN
+ | (EPXFERTYPE_is_ISO(ep) ? 0 : UDCCSR_SST));
+ }
+
+ spin_unlock_irqrestore(&ep->lock, flags);
+}
+
+/**
+ * pxa_ep_enable - Enables usb endpoint
+ * @_ep: usb endpoint
+ * @desc: usb endpoint descriptor
+ *
+ * Nothing much to do here, as ep configuration is done once and for all
+ * before udc is enabled. After udc enable, no physical endpoint configuration
+ * can be changed.
+ * Function makes sanity checks and flushes the endpoint.
+ */
+static int pxa_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+ struct pxa_udc *udc;
+
+ if (!_ep || !desc)
+ return -EINVAL;
+
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ if (udc_usb_ep->pxa_ep) {
+ ep = udc_usb_ep->pxa_ep;
+ ep_warn(ep, "usb_ep %s already enabled, doing nothing\n",
+ _ep->name);
+ } else {
+ ep = find_pxa_ep(udc_usb_ep->dev, udc_usb_ep);
+ }
+
+ if (!ep || is_ep0(ep)) {
+ dev_err(udc_usb_ep->dev->dev,
+ "unable to match pxa_ep for ep %s\n",
+ _ep->name);
+ return -EINVAL;
+ }
+
+ if ((desc->bDescriptorType != USB_DT_ENDPOINT)
+ || (ep->type != usb_endpoint_type(desc))) {
+ ep_err(ep, "type mismatch\n");
+ return -EINVAL;
+ }
+
+ if (ep->fifo_size < usb_endpoint_maxp(desc)) {
+ ep_err(ep, "bad maxpacket\n");
+ return -ERANGE;
+ }
+
+ udc_usb_ep->pxa_ep = ep;
+ udc = ep->dev;
+
+ if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+ ep_err(ep, "bogus device state\n");
+ return -ESHUTDOWN;
+ }
+
+ ep->enabled = 1;
+
+ /* flush fifo (mostly for OUT buffers) */
+ pxa_ep_fifo_flush(_ep);
+
+ ep_dbg(ep, "enabled\n");
+ return 0;
+}
+
+/**
+ * pxa_ep_disable - Disable usb endpoint
+ * @_ep: usb endpoint
+ *
+ * Same as for pxa_ep_enable, no physical endpoint configuration can be
+ * changed.
+ * Function flushes the endpoint and related requests.
+ */
+static int pxa_ep_disable(struct usb_ep *_ep)
+{
+ struct pxa_ep *ep;
+ struct udc_usb_ep *udc_usb_ep;
+
+ if (!_ep)
+ return -EINVAL;
+
+ udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
+ ep = udc_usb_ep->pxa_ep;
+ if (!ep || is_ep0(ep) || !list_empty(&ep->queue))
+ return -EINVAL;
+
+ ep->enabled = 0;
+ nuke(ep, -ESHUTDOWN);
+
+ pxa_ep_fifo_flush(_ep);
+ udc_usb_ep->pxa_ep = NULL;
+
+ ep_dbg(ep, "disabled\n");
+ return 0;
+}
+
+static const struct usb_ep_ops pxa_ep_ops = {
+ .enable = pxa_ep_enable,
+ .disable = pxa_ep_disable,
+
+ .alloc_request = pxa_ep_alloc_request,
+ .free_request = pxa_ep_free_request,
+
+ .queue = pxa_ep_queue,
+ .dequeue = pxa_ep_dequeue,
+
+ .set_halt = pxa_ep_set_halt,
+ .fifo_status = pxa_ep_fifo_status,
+ .fifo_flush = pxa_ep_fifo_flush,
+};
+
+/**
+ * dplus_pullup - Connect or disconnect pullup resistor to D+ pin
+ * @udc: udc device
+ * @on: 0 if disconnect pullup resistor, 1 otherwise
+ * Context: any
+ *
+ * Handle D+ pullup resistor, make the device visible to the usb bus, and
+ * declare it as a full speed usb device
+ */
+static void dplus_pullup(struct pxa_udc *udc, int on)
+{
+ if (udc->gpiod) {
+ gpiod_set_value(udc->gpiod, on);
+ } else if (udc->udc_command) {
+ if (on)
+ udc->udc_command(PXA2XX_UDC_CMD_CONNECT);
+ else
+ udc->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
+ }
+ udc->pullup_on = on;
+}
+
+/**
+ * pxa_udc_get_frame - Returns usb frame number
+ * @_gadget: usb gadget
+ */
+static int pxa_udc_get_frame(struct usb_gadget *_gadget)
+{
+ struct pxa_udc *udc = to_gadget_udc(_gadget);
+
+ return (udc_readl(udc, UDCFNR) & 0x7ff);
+}
+
+/**
+ * pxa_udc_wakeup - Force udc device out of suspend
+ * @_gadget: usb gadget
+ *
+ * Returns 0 if successful, error code otherwise
+ */
+static int pxa_udc_wakeup(struct usb_gadget *_gadget)
+{
+ struct pxa_udc *udc = to_gadget_udc(_gadget);
+
+ /* host may not have enabled remote wakeup */
+ if ((udc_readl(udc, UDCCR) & UDCCR_DWRE) == 0)
+ return -EHOSTUNREACH;
+ udc_set_mask_UDCCR(udc, UDCCR_UDR);
+ return 0;
+}
+
+static void udc_enable(struct pxa_udc *udc);
+static void udc_disable(struct pxa_udc *udc);
+
+/**
+ * should_enable_udc - Tells if UDC should be enabled
+ * @udc: udc device
+ * Context: any
+ *
+ * The UDC should be enabled if :
+ * - the pullup resistor is connected
+ * - and a gadget driver is bound
+ * - and vbus is sensed (or no vbus sense is available)
+ *
+ * Returns 1 if UDC should be enabled, 0 otherwise
+ */
+static int should_enable_udc(struct pxa_udc *udc)
+{
+ int put_on;
+
+ put_on = ((udc->pullup_on) && (udc->driver));
+ put_on &= ((udc->vbus_sensed) || (IS_ERR_OR_NULL(udc->transceiver)));
+ return put_on;
+}
+
+/**
+ * should_disable_udc - Tells if UDC should be disabled
+ * @udc: udc device
+ * Context: any
+ *
+ * The UDC should be disabled if :
+ * - the pullup resistor is not connected
+ * - or no gadget driver is bound
+ * - or no vbus is sensed (when vbus sesing is available)
+ *
+ * Returns 1 if UDC should be disabled
+ */
+static int should_disable_udc(struct pxa_udc *udc)
+{
+ int put_off;
+
+ put_off = ((!udc->pullup_on) || (!udc->driver));
+ put_off |= ((!udc->vbus_sensed) && (!IS_ERR_OR_NULL(udc->transceiver)));
+ return put_off;
+}
+
+/**
+ * pxa_udc_pullup - Offer manual D+ pullup control
+ * @_gadget: usb gadget using the control
+ * @is_active: 0 if disconnect, else connect D+ pullup resistor
+ *
+ * Context: task context, might sleep
+ *
+ * Returns 0 if OK, -EOPNOTSUPP if udc driver doesn't handle D+ pullup
+ */
+static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active)
+{
+ struct pxa_udc *udc = to_gadget_udc(_gadget);
+
+ if (!udc->gpiod && !udc->udc_command)
+ return -EOPNOTSUPP;
+
+ dplus_pullup(udc, is_active);
+
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ if (should_disable_udc(udc))
+ udc_disable(udc);
+ return 0;
+}
+
+/**
+ * pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
+ * @_gadget: usb gadget
+ * @is_active: 0 if should disable the udc, 1 if should enable
+ *
+ * Enables the udc, and optionnaly activates D+ pullup resistor. Or disables the
+ * udc, and deactivates D+ pullup resistor.
+ *
+ * Returns 0
+ */
+static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+ struct pxa_udc *udc = to_gadget_udc(_gadget);
+
+ udc->vbus_sensed = is_active;
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ if (should_disable_udc(udc))
+ udc_disable(udc);
+
+ return 0;
+}
+
+/**
+ * pxa_udc_vbus_draw - Called by gadget driver after SET_CONFIGURATION completed
+ * @_gadget: usb gadget
+ * @mA: current drawn
+ *
+ * Context: task context, might sleep
+ *
+ * Called after a configuration was chosen by a USB host, to inform how much
+ * current can be drawn by the device from VBus line.
+ *
+ * Returns 0 or -EOPNOTSUPP if no transceiver is handling the udc
+ */
+static int pxa_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
+{
+ struct pxa_udc *udc;
+
+ udc = to_gadget_udc(_gadget);
+ if (!IS_ERR_OR_NULL(udc->transceiver))
+ return usb_phy_set_power(udc->transceiver, mA);
+ return -EOPNOTSUPP;
+}
+
+/**
+ * pxa_udc_phy_event - Called by phy upon VBus event
+ * @nb: notifier block
+ * @action: phy action, is vbus connect or disconnect
+ * @data: the usb_gadget structure in pxa_udc
+ *
+ * Called by the USB Phy when a cable connect or disconnect is sensed.
+ *
+ * Returns 0
+ */
+static int pxa_udc_phy_event(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct usb_gadget *gadget = data;
+
+ switch (action) {
+ case USB_EVENT_VBUS:
+ usb_gadget_vbus_connect(gadget);
+ return NOTIFY_OK;
+ case USB_EVENT_NONE:
+ usb_gadget_vbus_disconnect(gadget);
+ return NOTIFY_OK;
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
+static struct notifier_block pxa27x_udc_phy = {
+ .notifier_call = pxa_udc_phy_event,
+};
+
+static int pxa27x_udc_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver);
+static int pxa27x_udc_stop(struct usb_gadget *g);
+
+static const struct usb_gadget_ops pxa_udc_ops = {
+ .get_frame = pxa_udc_get_frame,
+ .wakeup = pxa_udc_wakeup,
+ .pullup = pxa_udc_pullup,
+ .vbus_session = pxa_udc_vbus_session,
+ .vbus_draw = pxa_udc_vbus_draw,
+ .udc_start = pxa27x_udc_start,
+ .udc_stop = pxa27x_udc_stop,
+};
+
+/**
+ * udc_disable - disable udc device controller
+ * @udc: udc device
+ * Context: any
+ *
+ * Disables the udc device : disables clocks, udc interrupts, control endpoint
+ * interrupts.
+ */
+static void udc_disable(struct pxa_udc *udc)
+{
+ if (!udc->enabled)
+ return;
+
+ udc_writel(udc, UDCICR0, 0);
+ udc_writel(udc, UDCICR1, 0);
+
+ udc_clear_mask_UDCCR(udc, UDCCR_UDE);
+
+ ep0_idle(udc);
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ clk_disable(udc->clk);
+
+ udc->enabled = 0;
+}
+
+/**
+ * udc_init_data - Initialize udc device data structures
+ * @dev: udc device
+ *
+ * Initializes gadget endpoint list, endpoints locks. No action is taken
+ * on the hardware.
+ */
+static void udc_init_data(struct pxa_udc *dev)
+{
+ int i;
+ struct pxa_ep *ep;
+
+ /* device/ep0 records init */
+ INIT_LIST_HEAD(&dev->gadget.ep_list);
+ INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
+ dev->udc_usb_ep[0].pxa_ep = &dev->pxa_ep[0];
+ dev->gadget.quirk_altset_not_supp = 1;
+ ep0_idle(dev);
+
+ /* PXA endpoints init */
+ for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
+ ep = &dev->pxa_ep[i];
+
+ ep->enabled = is_ep0(ep);
+ INIT_LIST_HEAD(&ep->queue);
+ spin_lock_init(&ep->lock);
+ }
+
+ /* USB endpoints init */
+ for (i = 1; i < NR_USB_ENDPOINTS; i++) {
+ list_add_tail(&dev->udc_usb_ep[i].usb_ep.ep_list,
+ &dev->gadget.ep_list);
+ usb_ep_set_maxpacket_limit(&dev->udc_usb_ep[i].usb_ep,
+ dev->udc_usb_ep[i].usb_ep.maxpacket);
+ }
+}
+
+/**
+ * udc_enable - Enables the udc device
+ * @udc: udc device
+ *
+ * Enables the udc device : enables clocks, udc interrupts, control endpoint
+ * interrupts, sets usb as UDC client and setups endpoints.
+ */
+static void udc_enable(struct pxa_udc *udc)
+{
+ if (udc->enabled)
+ return;
+
+ clk_enable(udc->clk);
+ udc_writel(udc, UDCICR0, 0);
+ udc_writel(udc, UDCICR1, 0);
+ udc_clear_mask_UDCCR(udc, UDCCR_UDE);
+
+ ep0_idle(udc);
+ udc->gadget.speed = USB_SPEED_FULL;
+ memset(&udc->stats, 0, sizeof(udc->stats));
+
+ pxa_eps_setup(udc);
+ udc_set_mask_UDCCR(udc, UDCCR_UDE);
+ ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_ACM);
+ udelay(2);
+ if (udc_readl(udc, UDCCR) & UDCCR_EMCE)
+ dev_err(udc->dev, "Configuration errors, udc disabled\n");
+
+ /*
+ * Caller must be able to sleep in order to cope with startup transients
+ */
+ msleep(100);
+
+ /* enable suspend/resume and reset irqs */
+ udc_writel(udc, UDCICR1,
+ UDCICR1_IECC | UDCICR1_IERU
+ | UDCICR1_IESU | UDCICR1_IERS);
+
+ /* enable ep0 irqs */
+ pio_irq_enable(&udc->pxa_ep[0]);
+
+ udc->enabled = 1;
+}
+
+/**
+ * pxa27x_udc_start - Register gadget driver
+ * @g: gadget
+ * @driver: gadget driver
+ *
+ * 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.
+ *
+ * Note that the udc is not automatically enabled. Check function
+ * should_enable_udc().
+ *
+ * Returns 0 if no error, -EINVAL, -ENODEV, -EBUSY otherwise
+ */
+static int pxa27x_udc_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver)
+{
+ struct pxa_udc *udc = to_pxa(g);
+ int retval;
+
+ /* first hook up the driver ... */
+ udc->driver = driver;
+
+ if (!IS_ERR_OR_NULL(udc->transceiver)) {
+ retval = otg_set_peripheral(udc->transceiver->otg,
+ &udc->gadget);
+ if (retval) {
+ dev_err(udc->dev, "can't bind to transceiver\n");
+ goto fail;
+ }
+ }
+
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ return 0;
+
+fail:
+ udc->driver = NULL;
+ return retval;
+}
+
+/**
+ * stop_activity - Stops udc endpoints
+ * @udc: udc device
+ *
+ * Disables all udc endpoints (even control endpoint), report disconnect to
+ * the gadget user.
+ */
+static void stop_activity(struct pxa_udc *udc)
+{
+ int i;
+
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+
+ for (i = 0; i < NR_USB_ENDPOINTS; i++)
+ pxa_ep_disable(&udc->udc_usb_ep[i].usb_ep);
+}
+
+/**
+ * pxa27x_udc_stop - Unregister the gadget driver
+ * @g: gadget
+ *
+ * Returns 0 if no error, -ENODEV, -EINVAL otherwise
+ */
+static int pxa27x_udc_stop(struct usb_gadget *g)
+{
+ struct pxa_udc *udc = to_pxa(g);
+
+ stop_activity(udc);
+ udc_disable(udc);
+
+ udc->driver = NULL;
+
+ if (!IS_ERR_OR_NULL(udc->transceiver))
+ return otg_set_peripheral(udc->transceiver->otg, NULL);
+ return 0;
+}
+
+/**
+ * handle_ep0_ctrl_req - handle control endpoint control request
+ * @udc: udc device
+ * @req: control request
+ */
+static void handle_ep0_ctrl_req(struct pxa_udc *udc,
+ struct pxa27x_request *req)
+{
+ struct pxa_ep *ep = &udc->pxa_ep[0];
+ union {
+ struct usb_ctrlrequest r;
+ u32 word[2];
+ } u;
+ int i;
+ int have_extrabytes = 0;
+ unsigned long flags;
+
+ nuke(ep, -EPROTO);
+ spin_lock_irqsave(&ep->lock, flags);
+
+ /*
+ * In the PXA320 manual, in the section about Back-to-Back setup
+ * packets, it describes this situation. The solution is to set OPC to
+ * get rid of the status packet, and then continue with the setup
+ * packet. Generalize to pxa27x CPUs.
+ */
+ if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
+ ep_write_UDCCSR(ep, UDCCSR0_OPC);
+
+ /* read SETUP packet */
+ for (i = 0; i < 2; i++) {
+ if (unlikely(ep_is_empty(ep)))
+ goto stall;
+ u.word[i] = udc_ep_readl(ep, UDCDR);
+ }
+
+ have_extrabytes = !ep_is_empty(ep);
+ while (!ep_is_empty(ep)) {
+ i = udc_ep_readl(ep, UDCDR);
+ ep_err(ep, "wrong to have extra bytes for setup : 0x%08x\n", i);
+ }
+
+ ep_dbg(ep, "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));
+ if (unlikely(have_extrabytes))
+ goto stall;
+
+ if (u.r.bRequestType & USB_DIR_IN)
+ set_ep0state(udc, IN_DATA_STAGE);
+ else
+ set_ep0state(udc, OUT_DATA_STAGE);
+
+ /* Tell UDC to enter Data Stage */
+ ep_write_UDCCSR(ep, UDCCSR0_SA | UDCCSR0_OPC);
+
+ spin_unlock_irqrestore(&ep->lock, flags);
+ i = udc->driver->setup(&udc->gadget, &u.r);
+ spin_lock_irqsave(&ep->lock, flags);
+ if (i < 0)
+ goto stall;
+out:
+ spin_unlock_irqrestore(&ep->lock, flags);
+ return;
+stall:
+ ep_dbg(ep, "protocol STALL, udccsr0=%03x err %d\n",
+ udc_ep_readl(ep, UDCCSR), i);
+ ep_write_UDCCSR(ep, UDCCSR0_FST | UDCCSR0_FTF);
+ set_ep0state(udc, STALL);
+ goto out;
+}
+
+/**
+ * handle_ep0 - Handle control endpoint data transfers
+ * @udc: udc device
+ * @fifo_irq: 1 if triggered by fifo service type irq
+ * @opc_irq: 1 if triggered by output packet complete type irq
+ *
+ * Context : interrupt handler
+ *
+ * Tries to transfer all pending request data into the endpoint and/or
+ * transfer all pending data in the endpoint into usb requests.
+ * Handles states of ep0 automata.
+ *
+ * PXA27x hardware handles several standard usb control requests without
+ * driver notification. The requests fully handled by hardware are :
+ * SET_ADDRESS, SET_FEATURE, CLEAR_FEATURE, GET_CONFIGURATION, GET_INTERFACE,
+ * GET_STATUS
+ * The requests handled by hardware, but with irq notification are :
+ * SYNCH_FRAME, SET_CONFIGURATION, SET_INTERFACE
+ * The remaining standard requests really handled by handle_ep0 are :
+ * GET_DESCRIPTOR, SET_DESCRIPTOR, specific requests.
+ * Requests standardized outside of USB 2.0 chapter 9 are handled more
+ * uniformly, by gadget drivers.
+ *
+ * The control endpoint state machine is _not_ USB spec compliant, it's even
+ * hardly compliant with Intel PXA270 developers guide.
+ * The key points which inferred this state machine are :
+ * - on every setup token, bit UDCCSR0_SA is raised and held until cleared by
+ * software.
+ * - on every OUT packet received, UDCCSR0_OPC is raised and held until
+ * cleared by software.
+ * - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
+ * before reading ep0.
+ * This is true only for PXA27x. This is not true anymore for PXA3xx family
+ * (check Back-to-Back setup packet in developers guide).
+ * - irq can be called on a "packet complete" event (opc_irq=1), while
+ * UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
+ * from experimentation).
+ * - as UDCCSR0_SA can be activated while in irq handling, and clearing
+ * UDCCSR0_OPC would flush the setup data, we almost never clear UDCCSR0_OPC
+ * => we never actually read the "status stage" packet of an IN data stage
+ * => this is not documented in Intel documentation
+ * - hardware as no idea of STATUS STAGE, it only handle SETUP STAGE and DATA
+ * STAGE. The driver add STATUS STAGE to send last zero length packet in
+ * OUT_STATUS_STAGE.
+ * - special attention was needed for IN_STATUS_STAGE. If a packet complete
+ * event is detected, we terminate the status stage without ackowledging the
+ * packet (not to risk to loose a potential SETUP packet)
+ */
+static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
+{
+ u32 udccsr0;
+ struct pxa_ep *ep = &udc->pxa_ep[0];
+ struct pxa27x_request *req = NULL;
+ int completed = 0;
+
+ if (!list_empty(&ep->queue))
+ req = list_entry(ep->queue.next, struct pxa27x_request, queue);
+
+ udccsr0 = udc_ep_readl(ep, UDCCSR);
+ ep_dbg(ep, "state=%s, req=%p, udccsr0=0x%03x, udcbcr=%d, irq_msk=%x\n",
+ EP0_STNAME(udc), req, udccsr0, udc_ep_readl(ep, UDCBCR),
+ (fifo_irq << 1 | opc_irq));
+
+ if (udccsr0 & UDCCSR0_SST) {
+ ep_dbg(ep, "clearing stall status\n");
+ nuke(ep, -EPIPE);
+ ep_write_UDCCSR(ep, UDCCSR0_SST);
+ ep0_idle(udc);
+ }
+
+ if (udccsr0 & UDCCSR0_SA) {
+ nuke(ep, 0);
+ set_ep0state(udc, SETUP_STAGE);
+ }
+
+ switch (udc->ep0state) {
+ case WAIT_FOR_SETUP:
+ /*
+ * Hardware bug : beware, we cannot clear OPC, since we would
+ * miss a potential OPC irq for a setup packet.
+ * So, we only do ... nothing, and hope for a next irq with
+ * UDCCSR0_SA set.
+ */
+ break;
+ case SETUP_STAGE:
+ udccsr0 &= UDCCSR0_CTRL_REQ_MASK;
+ if (likely(udccsr0 == UDCCSR0_CTRL_REQ_MASK))
+ handle_ep0_ctrl_req(udc, req);
+ break;
+ case IN_DATA_STAGE: /* GET_DESCRIPTOR */
+ if (epout_has_pkt(ep))
+ ep_write_UDCCSR(ep, UDCCSR0_OPC);
+ if (req && !ep_is_full(ep))
+ completed = write_ep0_fifo(ep, req);
+ if (completed)
+ ep0_end_in_req(ep, req, NULL);
+ break;
+ case OUT_DATA_STAGE: /* SET_DESCRIPTOR */
+ if (epout_has_pkt(ep) && req)
+ completed = read_ep0_fifo(ep, req);
+ if (completed)
+ ep0_end_out_req(ep, req, NULL);
+ break;
+ case STALL:
+ ep_write_UDCCSR(ep, UDCCSR0_FST);
+ break;
+ case IN_STATUS_STAGE:
+ /*
+ * Hardware bug : beware, we cannot clear OPC, since we would
+ * miss a potential PC irq for a setup packet.
+ * So, we only put the ep0 into WAIT_FOR_SETUP state.
+ */
+ if (opc_irq)
+ ep0_idle(udc);
+ break;
+ case OUT_STATUS_STAGE:
+ case WAIT_ACK_SET_CONF_INTERF:
+ ep_warn(ep, "should never get in %s state here!!!\n",
+ EP0_STNAME(ep->dev));
+ ep0_idle(udc);
+ break;
+ }
+}
+
+/**
+ * handle_ep - Handle endpoint data tranfers
+ * @ep: pxa physical endpoint
+ *
+ * Tries to transfer all pending request data into the endpoint and/or
+ * transfer all pending data in the endpoint into usb requests.
+ *
+ * Is always called from the interrupt handler. ep->lock must not be held.
+ */
+static void handle_ep(struct pxa_ep *ep)
+{
+ struct pxa27x_request *req;
+ int completed;
+ u32 udccsr;
+ int is_in = ep->dir_in;
+ int loop = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ if (ep->in_handle_ep)
+ goto recursion_detected;
+ ep->in_handle_ep = 1;
+
+ do {
+ completed = 0;
+ udccsr = udc_ep_readl(ep, UDCCSR);
+
+ if (likely(!list_empty(&ep->queue)))
+ req = list_entry(ep->queue.next,
+ struct pxa27x_request, queue);
+ else
+ req = NULL;
+
+ ep_dbg(ep, "req:%p, udccsr 0x%03x loop=%d\n",
+ req, udccsr, loop++);
+
+ if (unlikely(udccsr & (UDCCSR_SST | UDCCSR_TRN)))
+ udc_ep_writel(ep, UDCCSR,
+ udccsr & (UDCCSR_SST | UDCCSR_TRN));
+ if (!req)
+ break;
+
+ if (unlikely(is_in)) {
+ if (likely(!ep_is_full(ep)))
+ completed = write_fifo(ep, req);
+ } else {
+ if (likely(epout_has_pkt(ep)))
+ completed = read_fifo(ep, req);
+ }
+
+ if (completed) {
+ if (is_in)
+ ep_end_in_req(ep, req, &flags);
+ else
+ ep_end_out_req(ep, req, &flags);
+ }
+ } while (completed);
+
+ ep->in_handle_ep = 0;
+recursion_detected:
+ spin_unlock_irqrestore(&ep->lock, flags);
+}
+
+/**
+ * pxa27x_change_configuration - Handle SET_CONF usb request notification
+ * @udc: udc device
+ * @config: usb configuration
+ *
+ * Post the request to upper level.
+ * Don't use any pxa specific harware configuration capabilities
+ */
+static void pxa27x_change_configuration(struct pxa_udc *udc, int config)
+{
+ struct usb_ctrlrequest req ;
+
+ dev_dbg(udc->dev, "config=%d\n", config);
+
+ udc->config = config;
+ udc->last_interface = 0;
+ udc->last_alternate = 0;
+
+ req.bRequestType = 0;
+ req.bRequest = USB_REQ_SET_CONFIGURATION;
+ req.wValue = config;
+ req.wIndex = 0;
+ req.wLength = 0;
+
+ set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
+ udc->driver->setup(&udc->gadget, &req);
+ ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
+}
+
+/**
+ * pxa27x_change_interface - Handle SET_INTERF usb request notification
+ * @udc: udc device
+ * @iface: interface number
+ * @alt: alternate setting number
+ *
+ * Post the request to upper level.
+ * Don't use any pxa specific harware configuration capabilities
+ */
+static void pxa27x_change_interface(struct pxa_udc *udc, int iface, int alt)
+{
+ struct usb_ctrlrequest req;
+
+ dev_dbg(udc->dev, "interface=%d, alternate setting=%d\n", iface, alt);
+
+ udc->last_interface = iface;
+ udc->last_alternate = alt;
+
+ req.bRequestType = USB_RECIP_INTERFACE;
+ req.bRequest = USB_REQ_SET_INTERFACE;
+ req.wValue = alt;
+ req.wIndex = iface;
+ req.wLength = 0;
+
+ set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
+ udc->driver->setup(&udc->gadget, &req);
+ ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
+}
+
+/*
+ * irq_handle_data - Handle data transfer
+ * @irq: irq IRQ number
+ * @udc: dev pxa_udc device structure
+ *
+ * Called from irq handler, transferts data to or from endpoint to queue
+ */
+static void irq_handle_data(int irq, struct pxa_udc *udc)
+{
+ int i;
+ struct pxa_ep *ep;
+ u32 udcisr0 = udc_readl(udc, UDCISR0) & UDCCISR0_EP_MASK;
+ u32 udcisr1 = udc_readl(udc, UDCISR1) & UDCCISR1_EP_MASK;
+
+ if (udcisr0 & UDCISR_INT_MASK) {
+ udc->pxa_ep[0].stats.irqs++;
+ udc_writel(udc, UDCISR0, UDCISR_INT(0, UDCISR_INT_MASK));
+ handle_ep0(udc, !!(udcisr0 & UDCICR_FIFOERR),
+ !!(udcisr0 & UDCICR_PKTCOMPL));
+ }
+
+ udcisr0 >>= 2;
+ for (i = 1; udcisr0 != 0 && i < 16; udcisr0 >>= 2, i++) {
+ if (!(udcisr0 & UDCISR_INT_MASK))
+ continue;
+
+ udc_writel(udc, UDCISR0, UDCISR_INT(i, UDCISR_INT_MASK));
+
+ WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
+ if (i < ARRAY_SIZE(udc->pxa_ep)) {
+ ep = &udc->pxa_ep[i];
+ ep->stats.irqs++;
+ handle_ep(ep);
+ }
+ }
+
+ for (i = 16; udcisr1 != 0 && i < 24; udcisr1 >>= 2, i++) {
+ udc_writel(udc, UDCISR1, UDCISR_INT(i - 16, UDCISR_INT_MASK));
+ if (!(udcisr1 & UDCISR_INT_MASK))
+ continue;
+
+ WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
+ if (i < ARRAY_SIZE(udc->pxa_ep)) {
+ ep = &udc->pxa_ep[i];
+ ep->stats.irqs++;
+ handle_ep(ep);
+ }
+ }
+
+}
+
+/**
+ * irq_udc_suspend - Handle IRQ "UDC Suspend"
+ * @udc: udc device
+ */
+static void irq_udc_suspend(struct pxa_udc *udc)
+{
+ udc_writel(udc, UDCISR1, UDCISR1_IRSU);
+ udc->stats.irqs_suspend++;
+
+ if (udc->gadget.speed != USB_SPEED_UNKNOWN
+ && udc->driver && udc->driver->suspend)
+ udc->driver->suspend(&udc->gadget);
+ ep0_idle(udc);
+}
+
+/**
+ * irq_udc_resume - Handle IRQ "UDC Resume"
+ * @udc: udc device
+ */
+static void irq_udc_resume(struct pxa_udc *udc)
+{
+ udc_writel(udc, UDCISR1, UDCISR1_IRRU);
+ udc->stats.irqs_resume++;
+
+ if (udc->gadget.speed != USB_SPEED_UNKNOWN
+ && udc->driver && udc->driver->resume)
+ udc->driver->resume(&udc->gadget);
+}
+
+/**
+ * irq_udc_reconfig - Handle IRQ "UDC Change Configuration"
+ * @udc: udc device
+ */
+static void irq_udc_reconfig(struct pxa_udc *udc)
+{
+ unsigned config, interface, alternate, config_change;
+ u32 udccr = udc_readl(udc, UDCCR);
+
+ udc_writel(udc, UDCISR1, UDCISR1_IRCC);
+ udc->stats.irqs_reconfig++;
+
+ config = (udccr & UDCCR_ACN) >> UDCCR_ACN_S;
+ config_change = (config != udc->config);
+ pxa27x_change_configuration(udc, config);
+
+ interface = (udccr & UDCCR_AIN) >> UDCCR_AIN_S;
+ alternate = (udccr & UDCCR_AAISN) >> UDCCR_AAISN_S;
+ pxa27x_change_interface(udc, interface, alternate);
+
+ if (config_change)
+ update_pxa_ep_matches(udc);
+ udc_set_mask_UDCCR(udc, UDCCR_SMAC);
+}
+
+/**
+ * irq_udc_reset - Handle IRQ "UDC Reset"
+ * @udc: udc device
+ */
+static void irq_udc_reset(struct pxa_udc *udc)
+{
+ u32 udccr = udc_readl(udc, UDCCR);
+ struct pxa_ep *ep = &udc->pxa_ep[0];
+
+ dev_info(udc->dev, "USB reset\n");
+ udc_writel(udc, UDCISR1, UDCISR1_IRRS);
+ udc->stats.irqs_reset++;
+
+ if ((udccr & UDCCR_UDA) == 0) {
+ dev_dbg(udc->dev, "USB reset start\n");
+ stop_activity(udc);
+ }
+ udc->gadget.speed = USB_SPEED_FULL;
+ memset(&udc->stats, 0, sizeof udc->stats);
+
+ nuke(ep, -EPROTO);
+ ep_write_UDCCSR(ep, UDCCSR0_FTF | UDCCSR0_OPC);
+ ep0_idle(udc);
+}
+
+/**
+ * pxa_udc_irq - Main irq handler
+ * @irq: irq number
+ * @_dev: udc device
+ *
+ * Handles all udc interrupts
+ */
+static irqreturn_t pxa_udc_irq(int irq, void *_dev)
+{
+ struct pxa_udc *udc = _dev;
+ u32 udcisr0 = udc_readl(udc, UDCISR0);
+ u32 udcisr1 = udc_readl(udc, UDCISR1);
+ u32 udccr = udc_readl(udc, UDCCR);
+ u32 udcisr1_spec;
+
+ dev_vdbg(udc->dev, "Interrupt, UDCISR0:0x%08x, UDCISR1:0x%08x, "
+ "UDCCR:0x%08x\n", udcisr0, udcisr1, udccr);
+
+ udcisr1_spec = udcisr1 & 0xf8000000;
+ if (unlikely(udcisr1_spec & UDCISR1_IRSU))
+ irq_udc_suspend(udc);
+ if (unlikely(udcisr1_spec & UDCISR1_IRRU))
+ irq_udc_resume(udc);
+ if (unlikely(udcisr1_spec & UDCISR1_IRCC))
+ irq_udc_reconfig(udc);
+ if (unlikely(udcisr1_spec & UDCISR1_IRRS))
+ irq_udc_reset(udc);
+
+ if ((udcisr0 & UDCCISR0_EP_MASK) | (udcisr1 & UDCCISR1_EP_MASK))
+ irq_handle_data(irq, udc);
+
+ return IRQ_HANDLED;
+}
+
+static struct pxa_udc memory = {
+ .gadget = {
+ .ops = &pxa_udc_ops,
+ .ep0 = &memory.udc_usb_ep[0].usb_ep,
+ .name = driver_name,
+ .dev = {
+ .init_name = "gadget",
+ },
+ },
+
+ .udc_usb_ep = {
+ USB_EP_CTRL,
+ USB_EP_OUT_BULK(1),
+ USB_EP_IN_BULK(2),
+ USB_EP_IN_ISO(3),
+ USB_EP_OUT_ISO(4),
+ USB_EP_IN_INT(5),
+ },
+
+ .pxa_ep = {
+ PXA_EP_CTRL,
+ /* Endpoints for gadget zero */
+ PXA_EP_OUT_BULK(1, 1, 3, 0, 0),
+ PXA_EP_IN_BULK(2, 2, 3, 0, 0),
+ /* Endpoints for ether gadget, file storage gadget */
+ PXA_EP_OUT_BULK(3, 1, 1, 0, 0),
+ PXA_EP_IN_BULK(4, 2, 1, 0, 0),
+ PXA_EP_IN_ISO(5, 3, 1, 0, 0),
+ PXA_EP_OUT_ISO(6, 4, 1, 0, 0),
+ PXA_EP_IN_INT(7, 5, 1, 0, 0),
+ /* Endpoints for RNDIS, serial */
+ PXA_EP_OUT_BULK(8, 1, 2, 0, 0),
+ PXA_EP_IN_BULK(9, 2, 2, 0, 0),
+ PXA_EP_IN_INT(10, 5, 2, 0, 0),
+ /*
+ * All the following endpoints are only for completion. They
+ * won't never work, as multiple interfaces are really broken on
+ * the pxa.
+ */
+ PXA_EP_OUT_BULK(11, 1, 2, 1, 0),
+ PXA_EP_IN_BULK(12, 2, 2, 1, 0),
+ /* Endpoint for CDC Ether */
+ PXA_EP_OUT_BULK(13, 1, 1, 1, 1),
+ PXA_EP_IN_BULK(14, 2, 1, 1, 1),
+ }
+};
+
+#if defined(CONFIG_OF)
+static const struct of_device_id udc_pxa_dt_ids[] = {
+ { .compatible = "marvell,pxa270-udc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, udc_pxa_dt_ids);
+#endif
+
+/**
+ * pxa_udc_probe - probes the udc device
+ * @pdev: platform device
+ *
+ * Perform basic init : allocates udc clock, creates sysfs files, requests
+ * irq.
+ */
+static int pxa_udc_probe(struct platform_device *pdev)
+{
+ struct pxa_udc *udc = &memory;
+ int retval = 0, gpio;
+ struct pxa2xx_udc_mach_info *mach = dev_get_platdata(&pdev->dev);
+ unsigned long gpio_flags;
+
+ if (mach) {
+ gpio_flags = mach->gpio_pullup_inverted ? GPIOF_ACTIVE_LOW : 0;
+ gpio = mach->gpio_pullup;
+ if (gpio_is_valid(gpio)) {
+ retval = devm_gpio_request_one(&pdev->dev, gpio,
+ gpio_flags,
+ "USB D+ pullup");
+ if (retval)
+ return retval;
+ udc->gpiod = gpio_to_desc(mach->gpio_pullup);
+ }
+ udc->udc_command = mach->udc_command;
+ } else {
+ udc->gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_ASIS);
+ }
+
+ udc->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(udc->regs))
+ return PTR_ERR(udc->regs);
+ udc->irq = platform_get_irq(pdev, 0);
+ if (udc->irq < 0)
+ return udc->irq;
+
+ udc->dev = &pdev->dev;
+ if (of_have_populated_dt()) {
+ udc->transceiver =
+ devm_usb_get_phy_by_phandle(udc->dev, "phys", 0);
+ if (IS_ERR(udc->transceiver))
+ return PTR_ERR(udc->transceiver);
+ } else {
+ udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
+ }
+
+ if (IS_ERR(udc->gpiod)) {
+ dev_err(&pdev->dev, "Couldn't find or request D+ gpio : %ld\n",
+ PTR_ERR(udc->gpiod));
+ return PTR_ERR(udc->gpiod);
+ }
+ if (udc->gpiod)
+ gpiod_direction_output(udc->gpiod, 0);
+
+ udc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(udc->clk))
+ return PTR_ERR(udc->clk);
+
+ retval = clk_prepare(udc->clk);
+ if (retval)
+ return retval;
+
+ udc->vbus_sensed = 0;
+
+ the_controller = udc;
+ platform_set_drvdata(pdev, udc);
+ udc_init_data(udc);
+
+ /* irq setup after old hardware state is cleaned up */
+ retval = devm_request_irq(&pdev->dev, udc->irq, pxa_udc_irq,
+ IRQF_SHARED, driver_name, udc);
+ if (retval != 0) {
+ dev_err(udc->dev, "%s: can't get irq %i, err %d\n",
+ driver_name, udc->irq, retval);
+ goto err;
+ }
+
+ if (!IS_ERR_OR_NULL(udc->transceiver))
+ usb_register_notifier(udc->transceiver, &pxa27x_udc_phy);
+ retval = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+ if (retval)
+ goto err_add_gadget;
+
+ pxa_init_debugfs(udc);
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ return 0;
+
+err_add_gadget:
+ if (!IS_ERR_OR_NULL(udc->transceiver))
+ usb_unregister_notifier(udc->transceiver, &pxa27x_udc_phy);
+err:
+ clk_unprepare(udc->clk);
+ return retval;
+}
+
+/**
+ * pxa_udc_remove - removes the udc device driver
+ * @_dev: platform device
+ */
+static int pxa_udc_remove(struct platform_device *_dev)
+{
+ struct pxa_udc *udc = platform_get_drvdata(_dev);
+
+ usb_del_gadget_udc(&udc->gadget);
+ pxa_cleanup_debugfs(udc);
+
+ if (!IS_ERR_OR_NULL(udc->transceiver)) {
+ usb_unregister_notifier(udc->transceiver, &pxa27x_udc_phy);
+ usb_put_phy(udc->transceiver);
+ }
+
+ udc->transceiver = NULL;
+ the_controller = NULL;
+ clk_unprepare(udc->clk);
+
+ return 0;
+}
+
+static void pxa_udc_shutdown(struct platform_device *_dev)
+{
+ struct pxa_udc *udc = platform_get_drvdata(_dev);
+
+ if (udc_readl(udc, UDCCR) & UDCCR_UDE)
+ udc_disable(udc);
+}
+
+#ifdef CONFIG_PXA27x
+extern void pxa27x_clear_otgph(void);
+#else
+#define pxa27x_clear_otgph() do {} while (0)
+#endif
+
+#ifdef CONFIG_PM
+/**
+ * pxa_udc_suspend - Suspend udc device
+ * @_dev: platform device
+ * @state: suspend state
+ *
+ * Suspends udc : saves configuration registers (UDCCR*), then disables the udc
+ * device.
+ */
+static int pxa_udc_suspend(struct platform_device *_dev, pm_message_t state)
+{
+ struct pxa_udc *udc = platform_get_drvdata(_dev);
+ struct pxa_ep *ep;
+
+ ep = &udc->pxa_ep[0];
+ udc->udccsr0 = udc_ep_readl(ep, UDCCSR);
+
+ udc_disable(udc);
+ udc->pullup_resume = udc->pullup_on;
+ dplus_pullup(udc, 0);
+
+ if (udc->driver)
+ udc->driver->disconnect(&udc->gadget);
+
+ return 0;
+}
+
+/**
+ * pxa_udc_resume - Resume udc device
+ * @_dev: platform device
+ *
+ * Resumes udc : restores configuration registers (UDCCR*), then enables the udc
+ * device.
+ */
+static int pxa_udc_resume(struct platform_device *_dev)
+{
+ struct pxa_udc *udc = platform_get_drvdata(_dev);
+ struct pxa_ep *ep;
+
+ ep = &udc->pxa_ep[0];
+ udc_ep_writel(ep, UDCCSR, udc->udccsr0 & (UDCCSR0_FST | UDCCSR0_DME));
+
+ dplus_pullup(udc, udc->pullup_resume);
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ /*
+ * We do not handle OTG yet.
+ *
+ * OTGPH bit is set when sleep mode is entered.
+ * it indicates that OTG pad is retaining its state.
+ * Upon exit from sleep mode and before clearing OTGPH,
+ * Software must configure the USB OTG pad, UDC, and UHC
+ * to the state they were in before entering sleep mode.
+ */
+ pxa27x_clear_otgph();
+
+ return 0;
+}
+#endif
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:pxa27x-udc");
+
+static struct platform_driver udc_driver = {
+ .driver = {
+ .name = "pxa27x-udc",
+ .of_match_table = of_match_ptr(udc_pxa_dt_ids),
+ },
+ .probe = pxa_udc_probe,
+ .remove = pxa_udc_remove,
+ .shutdown = pxa_udc_shutdown,
+#ifdef CONFIG_PM
+ .suspend = pxa_udc_suspend,
+ .resume = pxa_udc_resume
+#endif
+};
+
+module_platform_driver(udc_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Robert Jarzmik");
+MODULE_LICENSE("GPL");