USB: omap_udc build fixes (sync with linux-omap)

Resync the omap_udc driver with the latest from the Linux-OMAP tree.
Changes include DMA API updates (it builds again!), clock/pm updates,
minor bugfixes, whitespace.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 195 insertions, 53 deletions

diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 15d77c307930..cdcfd42843d4 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -42,6 +42,7 @@
 #include <linux/usb_gadget.h>
 #include <linux/usb/otg.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>
@@ -60,6 +61,11 @@
 /* bulk DMA seems to be behaving for both IN and OUT */
 #define USE_DMA
 
+/* FIXME: OMAP2 currently has some problem in DMA mode */
+#ifdef CONFIG_ARCH_OMAP2
+#undef USE_DMA
+#endif
+
 /* ISO too */
 #define USE_ISO
 
@@ -99,7 +105,7 @@ static unsigned fifo_mode = 0;
  * boot parameter "omap_udc:fifo_mode=42"
  */
 module_param (fifo_mode, uint, 0);
-MODULE_PARM_DESC (fifo_mode, "endpoint setup (0 == default)");
+MODULE_PARM_DESC (fifo_mode, "endpoint configuration");
 
 #ifdef  USE_DMA
 static unsigned use_dma = 1;
@@ -122,7 +128,7 @@ static const char driver_desc [] = DRIVER_DESC;
 /*-------------------------------------------------------------------------*/
 
 /* there's a notion of "current endpoint" for modifying endpoint
- * state, and PIO access to its FIFO.  
+ * state, and PIO access to its FIFO.
  */
 
 static void use_ep(struct omap_ep *ep, u16 select)
@@ -391,7 +397,7 @@ done(struct omap_ep *ep, struct omap_req *req, int status)
 #define FIFO_EMPTY      (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
 #define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
 
-static inline int 
+static inline int
 write_packet(u8 *buf, struct omap_req *req, unsigned max)
 {
         unsigned        len;
@@ -456,7 +462,7 @@ static int write_fifo(struct omap_ep *ep, struct omap_req *req)
         return is_last;
 }
 
-static inline int 
+static inline int
 read_packet(u8 *buf, struct omap_req *req, unsigned avail)
 {
         unsigned        len;
@@ -542,9 +548,9 @@ static inline dma_addr_t dma_csac(unsigned lch)
         /* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
          * read before the DMA controller finished disabling the channel.
          */
-        csac = omap_readw(OMAP_DMA_CSAC(lch));
+        csac = OMAP_DMA_CSAC_REG(lch);
         if (csac == 0)
-                csac = omap_readw(OMAP_DMA_CSAC(lch));
+                csac = OMAP_DMA_CSAC_REG(lch);
         return csac;
 }
 
@@ -555,9 +561,9 @@ static inline dma_addr_t dma_cdac(unsigned lch)
         /* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
          * read before the DMA controller finished disabling the channel.
          */
-        cdac = omap_readw(OMAP_DMA_CDAC(lch));
+        cdac = OMAP_DMA_CDAC_REG(lch);
         if (cdac == 0)
-                cdac = omap_readw(OMAP_DMA_CDAC(lch));
+                cdac = OMAP_DMA_CDAC_REG(lch);
         return cdac;
 }
 
@@ -582,7 +588,7 @@ static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
 }
 
 #define DMA_DEST_LAST(x) (cpu_is_omap15xx() \
-                ? omap_readw(OMAP_DMA_CSAC(x)) /* really: CPC */ \
+                ? OMAP_DMA_CSAC_REG(x) /* really: CPC */ \
                 : dma_cdac(x))
 
 static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
@@ -620,17 +626,19 @@ static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
                         || (cpu_is_omap15xx() && length < ep->maxpacket)) {
                 txdma_ctrl = UDC_TXN_EOT | length;
                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
-                                length, 1, sync_mode);
+                                length, 1, sync_mode, 0, 0);
         } else {
                 length = min(length / ep->maxpacket,
                                 (unsigned) UDC_TXN_TSC + 1);
-                txdma_ctrl = length;
+                txdma_ctrl = length;
                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
-                                ep->ep.maxpacket >> 1, length, sync_mode);
+                                ep->ep.maxpacket >> 1, length, sync_mode,
+                                0, 0);
                 length *= ep->maxpacket;
         }
         omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
-                OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);
+                OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
+                0, 0);
 
         omap_start_dma(ep->lch);
         ep->dma_counter = dma_csac(ep->lch);
@@ -675,9 +683,11 @@ static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
         req->dma_bytes = packets * ep->ep.maxpacket;
         omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
                         ep->ep.maxpacket >> 1, packets,
-                        OMAP_DMA_SYNC_ELEMENT);
+                        OMAP_DMA_SYNC_ELEMENT,
+                        0, 0);
         omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
-                OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);
+                OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
+                0, 0);
         ep->dma_counter = DMA_DEST_LAST(ep->lch);
 
         UDC_RXDMA_REG(ep->dma_channel) = UDC_RXN_STOP | (packets - 1);
@@ -820,7 +830,8 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
                         omap_set_dma_dest_params(ep->lch,
                                 OMAP_DMA_PORT_TIPB,
                                 OMAP_DMA_AMODE_CONSTANT,
-                                (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
+                                (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG),
+                                0, 0);
                 }
         } else {
                 status = omap_request_dma(OMAP_DMA_USB_W2FC_RX0 - 1 + channel,
@@ -831,7 +842,8 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
                         omap_set_dma_src_params(ep->lch,
                                 OMAP_DMA_PORT_TIPB,
                                 OMAP_DMA_AMODE_CONSTANT,
-                                (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
+                                (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG),
+                                0, 0);
                         /* EMIFF */
                         omap_set_dma_dest_burst_mode(ep->lch,
                                                 OMAP_DMA_DATA_BURST_4);
@@ -846,7 +858,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 
                 /* channel type P: hw synch (fifo) */
                 if (!cpu_is_omap15xx())
-                        omap_writew(2, OMAP_DMA_LCH_CTRL(ep->lch));
+                        OMAP1_DMA_LCH_CTRL_REG(ep->lch) = 2;
         }
 
 just_restart:
@@ -893,7 +905,7 @@ static void dma_channel_release(struct omap_ep *ep)
         else
                 req = NULL;
 
-        active = ((1 << 7) & omap_readl(OMAP_DMA_CCR(ep->lch))) != 0;
+        active = ((1 << 7) & OMAP_DMA_CCR_REG(ep->lch)) != 0;
 
         DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
                         active ? "active" : "idle",
@@ -1117,7 +1129,7 @@ static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
                  */
                 dma_channel_release(ep);
                 dma_channel_claim(ep, channel);
-        } else 
+        } else
                 done(ep, req, -ECONNRESET);
         spin_unlock_irqrestore(&ep->udc->lock, flags);
         return 0;
@@ -1153,7 +1165,7 @@ static int omap_ep_set_halt(struct usb_ep *_ep, int value)
 
                 /* IN endpoints must already be idle */
                 if ((ep->bEndpointAddress & USB_DIR_IN)
-                                && !list_empty(&ep->queue)) { 
+                                && !list_empty(&ep->queue)) {
                         status = -EAGAIN;
                         goto done;
                 }
@@ -1298,6 +1310,23 @@ static void pullup_disable(struct omap_udc *udc)
         UDC_SYSCON1_REG &= ~UDC_PULLUP_EN;
 }
 
+static struct omap_udc *udc;
+
+static void omap_udc_enable_clock(int enable)
+{
+        if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL)
+                return;
+
+        if (enable) {
+                clk_enable(udc->dc_clk);
+                clk_enable(udc->hhc_clk);
+                udelay(100);
+        } else {
+                clk_disable(udc->hhc_clk);
+                clk_disable(udc->dc_clk);
+        }
+}
+
 /*
  * Called by whatever detects VBUS sessions:  external transceiver
  * driver, or maybe GPIO0 VBUS IRQ.  May request 48 MHz clock.
@@ -1318,10 +1347,22 @@ static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
                 else
                         FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
         }
+        if (udc->dc_clk != NULL && is_active) {
+                if (!udc->clk_requested) {
+                        omap_udc_enable_clock(1);
+                        udc->clk_requested = 1;
+                }
+        }
         if (can_pullup(udc))
                 pullup_enable(udc);
         else
                 pullup_disable(udc);
+        if (udc->dc_clk != NULL && !is_active) {
+                if (udc->clk_requested) {
+                        omap_udc_enable_clock(0);
+                        udc->clk_requested = 0;
+                }
+        }
         spin_unlock_irqrestore(&udc->lock, flags);
         return 0;
 }
@@ -1441,7 +1482,7 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
                 }
         }
 
-        /* IN/OUT packets mean we're in the DATA or STATUS stage.  
+        /* IN/OUT packets mean we're in the DATA or STATUS stage.
          * This driver uses only uses protocol stalls (ep0 never halts),
          * and if we got this far the gadget driver already had a
          * chance to stall.  Tries to be forgiving of host oddities.
@@ -1509,7 +1550,7 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
                                 } else if (stat == 0)
                                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
                                 UDC_EP_NUM_REG = 0;
-                                
+
                                 /* activate status stage */
                                 if (stat == 1) {
                                         done(ep0, req, 0);
@@ -1866,7 +1907,7 @@ static void pio_out_timer(unsigned long _ep)
 
         spin_lock_irqsave(&ep->udc->lock, flags);
         if (!list_empty(&ep->queue) && ep->ackwait) {
-                use_ep(ep, 0);
+                use_ep(ep, UDC_EP_SEL);
                 stat_flg = UDC_STAT_FLG_REG;
 
                 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
@@ -1876,12 +1917,12 @@ static void pio_out_timer(unsigned long _ep)
                         VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
                         req = container_of(ep->queue.next,
                                         struct omap_req, queue);
-                        UDC_EP_NUM_REG = ep->bEndpointAddress | UDC_EP_SEL;
                         (void) read_fifo(ep, req);
                         UDC_EP_NUM_REG = ep->bEndpointAddress;
                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
                         ep->ackwait = 1 + ep->double_buf;
-                }
+                } else
+                        deselect_ep();
         }
         mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
         spin_unlock_irqrestore(&ep->udc->lock, flags);
@@ -2028,7 +2069,17 @@ static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
 
 /*-------------------------------------------------------------------------*/
 
-static struct omap_udc *udc;
+static inline int machine_needs_vbus_session(void)
+{
+        return (machine_is_omap_innovator()
+                || machine_is_omap_osk()
+                || machine_is_omap_apollon()
+#ifndef CONFIG_MACH_OMAP_H4_OTG
+                || machine_is_omap_h4()
+#endif
+                || machine_is_sx1()
+                );
+}
 
 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 {
@@ -2070,6 +2121,9 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
         udc->gadget.dev.driver = &driver->driver;
         spin_unlock_irqrestore(&udc->lock, flags);
 
+        if (udc->dc_clk != NULL)
+                omap_udc_enable_clock(1);
+
         status = driver->bind (&udc->gadget);
         if (status) {
                 DBG("bind to %s --> %d\n", driver->driver.name, status);
@@ -2103,10 +2157,12 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
         /* boards that don't have VBUS sensing can't autogate 48MHz;
          * can't enter deep sleep while a gadget driver is active.
          */
-        if (machine_is_omap_innovator() || machine_is_omap_osk())
+        if (machine_needs_vbus_session())
                 omap_vbus_session(&udc->gadget, 1);
 
 done:
+        if (udc->dc_clk != NULL)
+                omap_udc_enable_clock(0);
         return status;
 }
 EXPORT_SYMBOL(usb_gadget_register_driver);
@@ -2121,7 +2177,10 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
         if (!driver || driver != udc->driver || !driver->unbind)
                 return -EINVAL;
 
-        if (machine_is_omap_innovator() || machine_is_omap_osk())
+        if (udc->dc_clk != NULL)
+                omap_udc_enable_clock(1);
+
+        if (machine_needs_vbus_session())
                 omap_vbus_session(&udc->gadget, 0);
 
         if (udc->transceiver)
@@ -2137,6 +2196,8 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
         udc->gadget.dev.driver = NULL;
         udc->driver = NULL;
 
+        if (udc->dc_clk != NULL)
+                omap_udc_enable_clock(0);
         DBG("unregistered driver '%s'\n", driver->driver.name);
         return status;
 }
@@ -2219,7 +2280,7 @@ static char *trx_mode(unsigned m, int enabled)
         case 0:         return enabled ? "*6wire" : "unused";
         case 1:         return "4wire";
         case 2:         return "3wire";
-        case 3:         return "6wire";
+        case 3:         return "6wire";
         default:        return "unknown";
         }
 }
@@ -2228,11 +2289,18 @@ static int proc_otg_show(struct seq_file *s)
 {
         u32             tmp;
         u32             trans;
+        char            *ctrl_name;
 
         tmp = OTG_REV_REG;
-        trans = USB_TRANSCEIVER_CTRL_REG;
-        seq_printf(s, "\nOTG rev %d.%d, transceiver_ctrl %05x\n",
-                tmp >> 4, tmp & 0xf, trans);
+        if (cpu_is_omap24xx()) {
+                ctrl_name = "control_devconf";
+                trans = CONTROL_DEVCONF_REG;
+        } else {
+                ctrl_name = "tranceiver_ctrl";
+                trans = USB_TRANSCEIVER_CTRL_REG;
+        }
+        seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
+                tmp >> 4, tmp & 0xf, ctrl_name, trans);
         tmp = OTG_SYSCON_1_REG;
         seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
                         FOURBITS "\n", tmp,
@@ -2307,7 +2375,7 @@ static int proc_udc_show(struct seq_file *s, void *_)
                 driver_desc,
                 use_dma ?  " (dma)" : "");
 
-        tmp = UDC_REV_REG & 0xff; 
+        tmp = UDC_REV_REG & 0xff;
         seq_printf(s,
                 "UDC rev %d.%d, fifo mode %d, gadget %s\n"
                 "hmc %d, transceiver %s\n",
@@ -2315,11 +2383,16 @@ static int proc_udc_show(struct seq_file *s, void *_)
                 fifo_mode,
                 udc->driver ? udc->driver->driver.name : "(none)",
                 HMC,
-                udc->transceiver ? udc->transceiver->label : "(none)");
-        seq_printf(s, "ULPD control %04x req %04x status %04x\n",
-                __REG16(ULPD_CLOCK_CTRL),
-                __REG16(ULPD_SOFT_REQ),
-                __REG16(ULPD_STATUS_REQ));
+                udc->transceiver
+                        ? udc->transceiver->label
+                        : ((cpu_is_omap1710() || cpu_is_omap24xx())
+                                ? "external" : "(none)"));
+        if (cpu_class_is_omap1()) {
+                seq_printf(s, "ULPD control %04x req %04x status %04x\n",
+                        __REG16(ULPD_CLOCK_CTRL),
+                        __REG16(ULPD_SOFT_REQ),
+                        __REG16(ULPD_STATUS_REQ));
+        }
 
         /* OTG controller registers */
         if (!cpu_is_omap15xx())
@@ -2504,9 +2577,10 @@ omap_ep_setup(char *name, u8 addr, u8 type,
                 dbuf = 1;
         } else {
                 /* double-buffering "not supported" on 15xx,
-                 * and ignored for PIO-IN on 16xx
+                 * and ignored for PIO-IN on newer chips
+                 * (for more reliable behavior)
                  */
-                if (!use_dma || cpu_is_omap15xx())
+                if (!use_dma || cpu_is_omap15xx() || cpu_is_omap24xx())
                         dbuf = 0;
 
                 switch (maxp) {
@@ -2549,7 +2623,7 @@ omap_ep_setup(char *name, u8 addr, u8 type,
         ep->bEndpointAddress = addr;
         ep->bmAttributes = type;
         ep->double_buf = dbuf;
-        ep->udc = udc; 
+        ep->udc = udc;
 
         ep->ep.name = ep->name;
         ep->ep.ops = &omap_ep_ops;
@@ -2709,15 +2783,37 @@ static int __init omap_udc_probe(struct platform_device *pdev)
         struct otg_transceiver  *xceiv = NULL;
         const char              *type = NULL;
         struct omap_usb_config  *config = pdev->dev.platform_data;
+        struct clk              *dc_clk;
+        struct clk              *hhc_clk;
 
         /* NOTE:  "knows" the order of the resources! */
-        if (!request_mem_region(pdev->resource[0].start, 
+        if (!request_mem_region(pdev->resource[0].start,
                         pdev->resource[0].end - pdev->resource[0].start + 1,
                         driver_name)) {
                 DBG("request_mem_region failed\n");
                 return -EBUSY;
         }
 
+        if (cpu_is_omap16xx()) {
+                dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
+                hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
+                BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
+                /* can't use omap_udc_enable_clock yet */
+                clk_enable(dc_clk);
+                clk_enable(hhc_clk);
+                udelay(100);
+        }
+
+        if (cpu_is_omap24xx()) {
+                dc_clk = clk_get(&pdev->dev, "usb_fck");
+                hhc_clk = clk_get(&pdev->dev, "usb_l4_ick");
+                BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
+                /* can't use omap_udc_enable_clock yet */
+                clk_enable(dc_clk);
+                clk_enable(hhc_clk);
+                udelay(100);
+        }
+
         INFO("OMAP UDC rev %d.%d%s\n",
                 UDC_REV_REG >> 4, UDC_REV_REG & 0xf,
                 config->otg ? ", Mini-AB" : "");
@@ -2727,7 +2823,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
                 hmc = HMC_1510;
                 type = "(unknown)";
 
-                if (machine_is_omap_innovator()) {
+                if (machine_is_omap_innovator() || machine_is_sx1()) {
                         /* just set up software VBUS detect, and then
                          * later rig it so we always report VBUS.
                          * FIXME without really sensing VBUS, we can't
@@ -2756,6 +2852,15 @@ static int __init omap_udc_probe(struct platform_device *pdev)
                 }
 
                 hmc = HMC_1610;
+
+                if (cpu_is_omap24xx()) {
+                        /* this could be transceiverless in one of the
+                         * "we don't need to know" modes.
+                         */
+                        type = "external";
+                        goto known;
+                }
+
                 switch (hmc) {
                 case 0:                 /* POWERUP DEFAULT == 0 */
                 case 4:
@@ -2794,6 +2899,7 @@ bad_on_1710:
                         goto cleanup0;
                 }
         }
+known:
         INFO("hmc mode %d, %s transceiver\n", hmc, type);
 
         /* a "gadget" abstracts/virtualizes the controller */
@@ -2818,8 +2924,8 @@ bad_on_1710:
         status = request_irq(pdev->resource[1].start, omap_udc_irq,
                         IRQF_SAMPLE_RANDOM, driver_name, udc);
         if (status != 0) {
-                ERR( "can't get irq %ld, err %d\n",
-                        pdev->resource[1].start, status);
+                ERR("can't get irq %d, err %d\n",
+                        (int) pdev->resource[1].start, status);
                 goto cleanup1;
         }
 
@@ -2827,24 +2933,41 @@ bad_on_1710:
         status = request_irq(pdev->resource[2].start, omap_udc_pio_irq,
                         IRQF_SAMPLE_RANDOM, "omap_udc pio", udc);
         if (status != 0) {
-                ERR( "can't get irq %ld, err %d\n",
-                        pdev->resource[2].start, status);
+                ERR("can't get irq %d, err %d\n",
+                        (int) pdev->resource[2].start, status);
                 goto cleanup2;
         }
 #ifdef  USE_ISO
         status = request_irq(pdev->resource[3].start, omap_udc_iso_irq,
                         IRQF_DISABLED, "omap_udc iso", udc);
         if (status != 0) {
-                ERR("can't get irq %ld, err %d\n",
-                        pdev->resource[3].start, status);
+                ERR("can't get irq %d, err %d\n",
+                        (int) pdev->resource[3].start, status);
                 goto cleanup3;
         }
 #endif
+        if (cpu_is_omap16xx()) {
+                udc->dc_clk = dc_clk;
+                udc->hhc_clk = hhc_clk;
+                clk_disable(hhc_clk);
+                clk_disable(dc_clk);
+        }
+
+        if (cpu_is_omap24xx()) {
+                udc->dc_clk = dc_clk;
+                udc->hhc_clk = hhc_clk;
+                /* FIXME OMAP2 don't release hhc & dc clock */
+#if 0
+                clk_disable(hhc_clk);
+                clk_disable(dc_clk);
+#endif
+        }
 
         create_proc_file();
-        device_add(&udc->gadget.dev);
-        return 0;
-
+        status = device_add(&udc->gadget.dev);
+        if (!status)
+                return status;
+        /* If fail, fall through */
 #ifdef  USE_ISO
 cleanup3:
         free_irq(pdev->resource[2].start, udc);
@@ -2860,8 +2983,17 @@ cleanup1:
 cleanup0:
         if (xceiv)
                 put_device(xceiv->dev);
+
+        if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
+                clk_disable(hhc_clk);
+                clk_disable(dc_clk);
+                clk_put(hhc_clk);
+                clk_put(dc_clk);
+        }
+
         release_mem_region(pdev->resource[0].start,
                         pdev->resource[0].end - pdev->resource[0].start + 1);
+
         return status;
 }
 
@@ -2891,6 +3023,13 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
         free_irq(pdev->resource[2].start, udc);
         free_irq(pdev->resource[1].start, udc);
 
+        if (udc->dc_clk) {
+                if (udc->clk_requested)
+                        omap_udc_enable_clock(0);
+                clk_put(udc->hhc_clk);
+                clk_put(udc->dc_clk);
+        }
+
         release_mem_region(pdev->resource[0].start,
                         pdev->resource[0].end - pdev->resource[0].start + 1);
 
diff --git a/drivers/usb/gadget/omap_udc.h b/drivers/usb/gadget/omap_udc.h
index 652ee4627344..1dc398bb9ab2 100644
--- a/drivers/usb/gadget/omap_udc.h
+++ b/drivers/usb/gadget/omap_udc.h
@@ -175,6 +175,9 @@ struct omap_udc {
         unsigned                        ep0_reset_config:1;
         unsigned                        ep0_setup:1;
         struct completion               *done;
+        struct clk                      *dc_clk;
+        struct clk                      *hhc_clk;
+        unsigned                        clk_requested:1;
 };
 
 /*-------------------------------------------------------------------------*/