telechips usb: not ready for use but, something is working, needs improvement.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18806 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 742 insertions, 5 deletions

diff --git a/firmware/target/arm/tcc77x/system-tcc77x.c b/firmware/target/arm/tcc77x/system-tcc77x.c
index 2c8959fded..38004851bd 100644
--- a/firmware/target/arm/tcc77x/system-tcc77x.c
+++ b/firmware/target/arm/tcc77x/system-tcc77x.c
@@ -26,7 +26,7 @@
 /* Externally defined interrupt handlers */
 extern void TIMER(void);
 extern void ADC(void);
-extern void USBD_IRQ(void);
+extern void USB_DEVICE(void);
 
 void irq(void)
 {
@@ -37,9 +37,9 @@ void irq(void)
         TIMER();
     else if (irq & ADC_IRQ_MASK)
         ADC();
-#ifdef HAVE_USBSTACK 
+#ifdef HAVE_USBSTACK
     else if (irq & USBD_IRQ_MASK)
-        USBD_IRQ();
+        USB_DEVICE();
 #endif
     else
         panicf("Unhandled IRQ 0x%08X", irq);
diff --git a/firmware/target/arm/tcc77x/usb-tcc77x.c b/firmware/target/arm/tcc77x/usb-tcc77x.c
index 9cfcb503e0..1092ed60a1 100644
--- a/firmware/target/arm/tcc77x/usb-tcc77x.c
+++ b/firmware/target/arm/tcc77x/usb-tcc77x.c
@@ -21,9 +21,744 @@
 
 #include "config.h"
 #include "usb.h"
-#include "system.h"
+
 #include "usb-tcc7xx.h"
 
+#include "cpu.h"
+#include "system.h"
+#include "kernel.h"
+#include "panic.h"
+
+#ifdef HAVE_USBSTACK
+#include "usb_ch9.h"
+#include "usb_core.h"
+
+#define TCC7xx_USB_EPIF_IRQ_MASK 0xf
+
+static int dbg_level = 0x02;
+static int global_ep_irq_mask = 0x1;
+#define DEBUG(level, fmt, args...) do { if (dbg_level & (level)) printf(fmt, ## args); } while (0)
+
+#include <inttypes.h>
+
+
+#include "sprintf.h"
+#include "power.h"
+
+#ifndef BOOTLOADER
+#define printf(...) do {} while (0)
+#define panicf_my panicf
+#else
+int printf(const char *fmt, ...);
+#define panicf_my(fmt, args...) {               \
+    int flags = disable_irq_save();             \
+    printf("*** PANIC ***");                    \
+    printf(fmt, ## args);                       \
+    printf("*** PANIC ***");                    \
+    while (usb_detect() == USB_INSERTED)        \
+        ;                                       \
+    power_off();                                \
+    while(1);                                   \
+    restore_irq(flags);                         \
+}
+#endif
+
+struct tcc_ep {
+    unsigned char dir;      /* endpoint direction */
+    volatile uint16_t  *ep; /* hw ep buffer */
+    int id;       /* Endpoint id */
+    int mask;     /* Endpoint bit mask */
+    char *buf;    /* user buffer to store data */
+    int max_len;  /* how match data will fit */
+    int count;    /* actual data count */
+    bool busy;
+} ;
+
+static struct tcc_ep tcc_endpoints[] = {
+    /* control */
+    {
+        .dir = -1,
+        .ep = &TCC7xx_USB_EP0_BUF,
+    }, {  /* bulk */
+        .dir = -1,
+        .ep = &TCC7xx_USB_EP1_BUF,
+    }, { /* bulk */
+        .dir = -1,
+        .ep = &TCC7xx_USB_EP2_BUF,
+    }, { /* interrupt */
+        .dir = -1,
+        .ep = &TCC7xx_USB_EP3_BUF,
+    },
+} ;
+
+static int usb_drv_write_packet(volatile unsigned short *buf, unsigned char *data, int len, int max);
+static void usb_set_speed(int);
+
+int usb_drv_request_endpoint(int dir)
+{
+    int flags = disable_irq_save();
+    size_t ep;
+    int ret = 0;
+
+    if (dir == USB_DIR_IN)
+        ep = 1;
+    else
+        ep = 2;
+
+    if (!tcc_endpoints[ep].busy) {
+        tcc_endpoints[ep].busy = true;
+        tcc_endpoints[ep].dir = dir;
+        ret = ep | dir;
+    } else {
+        ret = -1;
+    }
+
+    restore_irq(flags);
+    return ret;
+}
+
+void usb_drv_release_endpoint(int ep)
+{
+    int flags;
+    ep = ep & 0x7f;
+
+    if (ep < 1 || ep > NUM_ENDPOINTS)
+        return ;
+
+    flags = disable_irq_save();
+
+    tcc_endpoints[ep].busy = false;
+    tcc_endpoints[ep].dir = -1;
+
+    restore_irq(flags);
+}
+
+static void udelay(unsigned long msecs)
+{
+    /* TODO: implement me other way */
+    msecs*=126;
+    while (msecs--)
+        asm("nop;");
+}
+
+static inline void pullup_on(void)
+{
+    TCC7xx_USB_PHY_CFG = 0x000c;
+}
+
+static inline void pullup_off(void)
+{
+    TCC7xx_USB_PHY_CFG = 0x3e4c;
+}
+
+#if 0
+static
+char *dump_data(char *data, int count)
+{
+    static char buf[1024];
+    char *dump = buf;
+    int i;
+
+    for (i = 0; i < count; i++)
+        dump += snprintf(dump, sizeof(buf) - (dump - buf), "%02x", data[i]);
+    return buf;
+}
+#endif
+
+static
+void handle_control(void)
+{
+    /* control are always 8 bytes len */
+    static unsigned char ep_control[8];
+    struct usb_ctrlrequest *req =
+        (struct usb_ctrlrequest *) ep_control;
+    unsigned short stat;
+    unsigned short count = 0;
+    int i;
+    int type;
+
+    /* select control endpoint */
+    TCC7xx_USB_INDEX = 0x00;
+    stat = TCC7xx_USB_EP0_STAT;
+
+    if (stat & 0x10) {
+        DEBUG(2, "stall");
+        TCC7xx_USB_EP0_STAT = 0x10;
+    }
+
+    if (TCC7xx_USB_EP0_STAT & 0x01) { /* RX */
+        uint16_t *ptr = (uint16_t *) ep_control;
+
+        count = TCC7xx_USB_EP_BRCR;
+
+        if (TCC7xx_USB_EP0_STAT & 0x2)
+            TCC7xx_USB_EP0_STAT = 0x02;
+
+        if (count != 4) { /* bad control? */
+            unsigned short dummy;
+
+            while (count--)
+                dummy = TCC7xx_USB_EP0_BUF;
+                DEBUG(1, "WTF: count = %d", count);
+            } else {
+                /* simply read control packet */
+                for (i = 0; i < count; i++)
+                    ptr[i] = TCC7xx_USB_EP0_BUF;
+            }
+
+            count *= 2;
+            TCC7xx_USB_EP0_STAT = 0x01;
+            DEBUG(1, "CTRL: len = %d %04x", count, stat);
+    } else if (TCC7xx_USB_EP0_STAT & 0x02) { /* TX */
+        TCC7xx_USB_EP0_STAT = 0x02;
+        DEBUG(2, "TX Done\n");
+    } else {
+        DEBUG(1, "stat: %04x", stat);
+    }
+
+    TCC7xx_USB_EPIF = 1;
+
+    if (0 == (stat & 0x1) || count != 8)
+        return ;
+#if 1 /* TODO: remove me someday */
+    {
+        int i;
+        uint16_t *ptr = (uint16_t *) ep_control;
+        for (i = 1; i < (count>>1); i++) {
+            if (ptr[i] != ptr[0])
+                break;
+        }
+        if (i == (count>>1)) {
+            /*DEBUG(2, */panicf_my("sanity failed");
+            return ;
+        }
+    }
+#endif
+    type = req->bRequestType;
+
+    /* TODO: don't pass some kinds of requests to upper level */
+    switch (req->bRequest) {
+    case USB_REQ_CLEAR_FEATURE:
+        DEBUG(2, "USB_REQ_CLEAR_FEATURE");
+        DEBUG(2, "...%04x %04x", req->wValue, req->wIndex);
+        break;
+    case USB_REQ_SET_ADDRESS:
+        //DEBUG(2, "USB_REQ_SET_ADDRESS, %d %d", req->wValue, TCC7xx_USB_FUNC);
+        /* seems we don't have to set it manually
+           TCC7xx_USB_FUNC = req->wValue; */
+        break;
+    case USB_REQ_GET_DESCRIPTOR:
+        DEBUG(2, "gd, %02x %02x", req->wValue, req->wIndex);
+        break;
+    case USB_REQ_GET_CONFIGURATION:
+        DEBUG(2, "USB_REQ_GET_CONFIGURATION");
+        break;
+    default:
+        DEBUG(2, "req: %02x %02d", req->bRequestType, req->bRequest);
+    }
+
+    usb_core_control_request(req);
+}
+
+static
+void handle_ep_in(struct tcc_ep *tcc_ep, uint16_t stat)
+{
+    uint8_t *buf = tcc_ep->buf;
+    uint16_t *wbuf = (uint16_t *) buf;
+    int wcount;
+    int count;
+    int i;
+
+    if (tcc_ep->dir != USB_DIR_OUT) {
+        panicf_my("ep%d: is input only", tcc_ep->id);
+    }
+
+    wcount = TCC7xx_USB_EP_BRCR;
+
+    DEBUG(2, "ep%d: %04x %04x", tcc_ep->id, stat, wcount);
+
+    /* read data */
+    count = wcount * 2;
+    if (stat & TCC7xx_USP_EP_STAT_LWO) {
+        count--;
+        wcount--;
+    }
+
+    if (buf == NULL)
+        panicf_my("ep%d: Unexpected packet! %d %x", tcc_ep->id, count, TCC7xx_USB_EP_CTRL);
+    if (tcc_ep->max_len < count)
+        panicf_my("Too big packet: %d excepted %d %x", count, tcc_ep->max_len, TCC7xx_USB_EP_CTRL);
+
+    for (i = 0; i < wcount; i++)
+        wbuf[i] = *tcc_ep->ep;
+
+    if (count & 1) { /* lwo */
+        uint16_t tmp = *tcc_ep->ep;
+        buf[count - 1] = tmp & 0xff;
+    }
+
+    tcc_ep->buf = NULL;
+
+    TCC7xx_USB_EP_STAT = TCC7xx_USB_EP_STAT;
+    TCC7xx_USB_EPIF = tcc_ep->mask;
+    TCC7xx_USB_EPIE &= ~tcc_ep->mask; /* TODO: use INGLD? */
+    global_ep_irq_mask &= ~tcc_ep->mask;
+
+    if (TCC7xx_USB_EP_STAT & 0x1)
+        panicf_my("One more packet?");
+
+    TCC7xx_USB_EP_CTRL |= TCC7xx_USB_EP_CTRL_OUTHD;
+
+    usb_core_transfer_complete(tcc_ep->id, USB_DIR_OUT, 0, count);
+}
+
+static
+void handle_ep_out(struct tcc_ep *tcc_ep, uint16_t stat)
+{
+    (void) stat;
+
+    if (tcc_ep->dir != USB_DIR_IN) {
+        panicf_my("ep%d: is out only", tcc_ep->id);
+    }
+
+    if (tcc_ep->buf == NULL) {
+        panicf_my("%s:%d", __FILE__, __LINE__);
+    }
+
+    if (tcc_ep->max_len) {
+        int count = usb_drv_write_packet(tcc_ep->ep,
+                                            tcc_ep->buf,
+                                            tcc_ep->max_len,
+                                            512);
+        tcc_ep->buf += count;
+        tcc_ep->max_len -= count;
+        tcc_ep->count += count;
+    } else {
+        tcc_ep->buf = NULL;
+    }
+
+    TCC7xx_USB_EP_STAT = 0x2; /* Clear TX stat */
+    TCC7xx_USB_EPIF = tcc_ep->mask;
+
+    if (tcc_ep->buf == NULL) {
+        TCC7xx_USB_EPIE &= ~tcc_ep->mask;
+        global_ep_irq_mask &= ~tcc_ep->mask;
+
+        usb_core_transfer_complete(tcc_ep->id, USB_DIR_IN, 0, tcc_ep->count);
+    }
+}
+
+static
+void handle_ep(unsigned short ep_irq)
+{
+    if (ep_irq & 0x1) {
+        handle_control();
+    }
+
+    if (ep_irq & 0xe) {
+        int endpoint;
+
+        for (endpoint = 1; endpoint < 4; endpoint++) {
+            struct tcc_ep *tcc_ep = &tcc_endpoints[endpoint];
+            uint16_t stat;
+
+            if (0 == (ep_irq & (1 << endpoint)))
+                continue;
+            if (!tcc_ep->busy)
+                panicf_my("ep%d: wasn't requested", endpoint);
+
+            TCC7xx_USB_INDEX = endpoint;
+            stat = TCC7xx_USB_EP_STAT;
+
+            DEBUG(1, "ep%d: %04x", endpoint, stat);
+
+            if (stat & 0x1)
+                handle_ep_in(tcc_ep, stat);
+            else if (stat & 0x2)
+                handle_ep_out(tcc_ep, stat);
+            else /* TODO: remove me? */
+                panicf_my("Unhandled ep%d state: %x, %d", endpoint, TCC7xx_USB_EP_STAT, TCC7xx_USB_INDEX);
+        }
+    }
+}
+
+static void usb_set_speed(int high_speed)
+{
+    TCC7xx_USB_EP_DIR = 0x0000;
+
+    /* control endpoint */
+    TCC7xx_USB_INDEX = 0;
+    TCC7xx_USB_EP0_CTRL = 0x0000;
+    TCC7xx_USB_EP_MAXP = 64;
+    TCC7xx_USB_EP_CTRL = TCC7xx_USB_EP_CTRL_CDP | TCC7xx_USB_EP_CTRL_FLUSH;
+
+    /* ep1: bulk-in, to host */
+    TCC7xx_USB_INDEX = 1;
+    TCC7xx_USB_EP_DIR |= (1 << 1);
+    TCC7xx_USB_EP_CTRL = TCC7xx_USB_EP_CTRL_CDP;
+
+    if (high_speed)
+        TCC7xx_USB_EP_MAXP = 512;
+    else
+        TCC7xx_USB_EP_MAXP = 64;
+
+    TCC7xx_USB_EP_DMA_CTRL = 0x0;
+
+    /* ep2: bulk-out, from host */
+    TCC7xx_USB_INDEX = 2;
+    TCC7xx_USB_EP_DIR &= ~(1 << 2);
+    TCC7xx_USB_EP_CTRL = TCC7xx_USB_EP_CTRL_CDP;
+
+    if (high_speed)
+        TCC7xx_USB_EP_MAXP = 512;
+    else
+        TCC7xx_USB_EP_MAXP = 64;
+
+    TCC7xx_USB_EP_DMA_CTRL = 0x0;
+
+    /* ep3: interrupt in */
+    TCC7xx_USB_INDEX = 3;
+    TCC7xx_USB_EP_DIR &= ~(1 << 3);
+    TCC7xx_USB_EP_CTRL = TCC7xx_USB_EP_CTRL_CDP;
+    TCC7xx_USB_EP_MAXP = 64;
+
+    TCC7xx_USB_EP_DMA_CTRL = 0x0;
+}
+
+/*
+  Reset TCC7xx usb device
+ */
+static void usb_reset(void)
+{
+    pullup_on();
+
+    TCC7xx_USB_DELAY_CTRL |= 0x81;
+
+    TCC7xx_USB_SYS_CTRL = 0xa000 |
+        TCC7xx_USB_SYS_CTRL_RESET |
+        TCC7xx_USB_SYS_CTRL_RFRE  |
+        TCC7xx_USB_SYS_CTRL_SPDEN |
+        TCC7xx_USB_SYS_CTRL_VBONE |
+        TCC7xx_USB_SYS_CTRL_VBOFE;
+
+    usb_set_speed(1);
+    pullup_on();
+
+    TCC7xx_USB_EPIF = TCC7xx_USB_EPIF_IRQ_MASK;
+    global_ep_irq_mask = 0x1;
+    TCC7xx_USB_EPIE = global_ep_irq_mask;
+
+    usb_core_bus_reset();
+}
+
+/* IRQ handler */
+void USB_DEVICE(void)
+{
+    unsigned short sys_stat;
+    unsigned short ep_irq;
+    unsigned short index_save;
+
+    sys_stat = TCC7xx_USB_SYS_STAT;
+
+    if (sys_stat & TCC7xx_USB_SYS_STAT_RESET) {
+        TCC7xx_USB_SYS_STAT = TCC7xx_USB_SYS_STAT_RESET;
+        usb_reset();
+        TCC7xx_USB_SYS_CTRL |= TCC7xx_USB_SYS_CTRL_SUSPEND;
+        DEBUG(2, "reset");
+    }
+
+    if (sys_stat & TCC7xx_USB_SYS_STAT_RESUME) {
+        TCC7xx_USB_SYS_STAT = TCC7xx_USB_SYS_STAT_RESUME;
+        usb_reset();
+        TCC7xx_USB_SYS_CTRL |= TCC7xx_USB_SYS_CTRL_SUSPEND;
+        DEBUG(2, "resume");
+    }
+
+    if (sys_stat & TCC7xx_USB_SYS_STAT_SPD_END) {
+        usb_set_speed(1);
+        TCC7xx_USB_SYS_STAT = TCC7xx_USB_SYS_STAT_SPD_END;
+        DEBUG(2, "spd end");
+    }
+
+    if (sys_stat & TCC7xx_USB_SYS_STAT_ERRORS) {
+        DEBUG(2, "errors: %4x", sys_stat & TCC7xx_USB_SYS_STAT_ERRORS);
+        TCC7xx_USB_SYS_STAT = sys_stat & TCC7xx_USB_SYS_STAT_ERRORS;
+    }
+
+//    TCC7xx_USB_SYS_STAT = sys_stat;
+
+    index_save = TCC7xx_USB_INDEX;
+
+    ep_irq = TCC7xx_USB_EPIF & global_ep_irq_mask;
+
+    while (ep_irq & TCC7xx_USB_EPIF_IRQ_MASK) {
+        handle_ep(ep_irq);
+
+        /* is that really needed, btw not a problem for rockbox */
+        udelay(50);
+        ep_irq = TCC7xx_USB_EPIF & global_ep_irq_mask;
+    }
+
+    TCC7xx_USB_INDEX = index_save;
+}
+
+void usb_drv_set_address(int address)
+{
+    DEBUG(2, "setting address %d %d", address, TCC7xx_USB_FUNC);
+}
+
+int usb_drv_port_speed(void)
+{
+    return (TCC7xx_USB_SYS_STAT & 0x10) ? 1 : 0;
+}
+
+static int usb_drv_write_packet(volatile unsigned short *buf, unsigned char *data, int len, int max)
+{
+    uint16_t  *wbuf = (uint16_t *) data;
+    int count, i;
+
+    len = MIN(len, max);
+    count = (len + 1) / 2;
+
+    TCC7xx_USB_EP_BWCR = len;
+
+    for (i = 0; i < count; i++)
+        *buf = *wbuf++;
+
+    return len;
+}
+
+int usb_drv_send(int endpoint, void *ptr, int length)
+{
+    int flags = disable_irq_save();
+    int rc = 0;
+    char *data = (unsigned char*) ptr;;
+
+    DEBUG(2, "%s(%d,%d)" , __func__, endpoint, length);
+
+    if (endpoint != 0)
+        panicf_my("%s(%d,%d)", __func__, endpoint, length);
+
+    TCC7xx_USB_INDEX = 0;
+    while (length > 0) {
+        int ret;
+
+        ret = usb_drv_write_packet(&TCC7xx_USB_EP0_BUF, data, length, 64);
+        length -= ret;
+        data += ret;
+
+        while (0 == (TCC7xx_USB_EP0_STAT & 0x2))
+            ;
+        TCC7xx_USB_EP0_STAT = 0x2;
+    }
+
+    restore_irq(flags);
+    return rc;
+}
+
+int usb_drv_send_nonblocking(int endpoint, void *ptr, int length)
+{
+    int flags;
+    int rc = 0, count = length;
+    char *data = (unsigned char*) ptr;
+    struct tcc_ep *ep = &tcc_endpoints[endpoint & 0x7f];
+
+    if (ep->dir != USB_DIR_IN || length == 0)
+        panicf_my("%s(%d,%d): Not supported", __func__, endpoint, length);
+
+    DEBUG(2, "%s(%d,%d):", __func__, endpoint, length);
+
+    flags = disable_irq_save();
+
+    if(ep->buf != NULL) {
+        panicf_my("%s: ep is already busy", __func__);
+    }
+
+    TCC7xx_USB_INDEX = ep->id;
+
+    count = usb_drv_write_packet(ep->ep, data, length, 512);
+
+    data += count;
+    length -= count;
+
+    ep->buf = data;
+    ep->max_len = length;
+    ep->count = count;
+
+    TCC7xx_USB_EPIE |= ep->mask;
+    global_ep_irq_mask |= ep->mask;
+
+    restore_irq(flags);
+
+    DEBUG(2, "%s end", __func__);
+
+    return rc;
+}
+
+int usb_drv_recv(int endpoint, void* ptr, int length)
+{
+    volatile struct tcc_ep *tcc_ep = &tcc_endpoints[endpoint & 0x7f];
+    int flags;
+
+    if (length == 0) {
+        if (endpoint != 0)
+            panicf_my("%s(%d,%d) zero length?", __func__, endpoint, length);
+        return 0;
+    }
+    // TODO: check ep
+    if (tcc_ep->dir != USB_DIR_OUT)
+        panicf_my("%s(%d,%d)", __func__, endpoint, length);
+
+    DEBUG(2, "%s(%d,%d)", __func__, endpoint, length);
+
+    flags = disable_irq_save();
+
+    if (tcc_ep->buf) {
+        panicf_my("%s: overrun: %x %x", __func__, tcc_ep->buf, tcc_ep);
+    }
+
+    tcc_ep->buf = ptr;
+    tcc_ep->max_len = length;
+    tcc_ep->count = 0;
+
+    TCC7xx_USB_INDEX = tcc_ep->id;
+
+    TCC7xx_USB_EP_CTRL &= ~TCC7xx_USB_EP_CTRL_OUTHD;
+    TCC7xx_USB_EPIE |= tcc_ep->mask;
+    global_ep_irq_mask |= tcc_ep->mask;
+
+    restore_irq(flags);
+
+    return 0;
+}
+
+void usb_drv_cancel_all_transfers(void)
+{
+    int endpoint;
+    int flags;
+
+    DEBUG(2, "%s", __func__);
+
+    flags = disable_irq_save();
+    for (endpoint = 0; endpoint < 4; endpoint++) {
+        if (tcc_endpoints[endpoint].buf) {
+/*            usb_core_transfer_complete(tcc_endpoints[endpoint].id,
+                                        tcc_endpoints[endpoint].dir, -1, 0); */
+            tcc_endpoints[endpoint].buf = NULL;
+        }
+    }
+
+    global_ep_irq_mask = 1;
+    TCC7xx_USB_EPIE = global_ep_irq_mask;
+    TCC7xx_USB_EPIF = TCC7xx_USB_EPIF_IRQ_MASK;
+    restore_irq(flags);
+}
+
+void usb_drv_set_test_mode(int mode)
+{
+    panicf_my("%s(%d)", __func__, mode);
+}
+
+bool usb_drv_stalled(int endpoint, bool in)
+{
+    panicf_my("%s(%d,%d)", __func__, endpoint, in);
+}
+
+void usb_drv_stall(int endpoint, bool stall,bool in)
+{
+    printf("%s(%d,%d,%d)", __func__, endpoint, stall, in);
+}
+
+void usb_drv_init(void)
+{
+    size_t i;
+
+    DEBUG(2, "%s", __func__);
+
+    for (i = 0; i < sizeof(tcc_endpoints)/sizeof(struct tcc_ep); i++) {
+        tcc_endpoints[i].id = i;
+        tcc_endpoints[i].mask = 1 << i;
+        tcc_endpoints[i].buf = NULL;
+        tcc_endpoints[i].busy = false;
+        tcc_endpoints[i].dir = -1;
+    }
+
+    /* Enable USB clock */
+    BCLKCTR |= DEV_USBD;
+
+    /* switch USB to host and then reset */
+    TCC7xx_USB_PHY_CFG = 0x3e4c;
+    SWRESET |= DEV_USBD;
+    udelay(50);
+    SWRESET &= ~DEV_USBD;
+
+    usb_reset();
+
+    /* unmask irq */
+    CREQ = USBD_IRQ_MASK;
+    IRQSEL |= USBD_IRQ_MASK;
+    TMODE &= ~USBD_IRQ_MASK;
+    IEN |= USBD_IRQ_MASK;
+}
+
+void usb_drv_exit(void)
+{
+    TCC7xx_USB_EPIE = 0;
+    BCLKCTR &= ~DEV_USBD;
+
+    SWRESET |= DEV_USBD;
+    udelay(50);
+    SWRESET &= ~DEV_USBD;
+
+    pullup_off();
+}
+
+void usb_init_device(void)
+{
+}
+
+void usb_enable(bool on)
+{
+    if (on)
+        usb_core_init();
+    else
+        usb_core_exit();
+}
+
+
+int usb_detect(void)
+{
+    /* TODO: not correct for all targets, we should poll VBUS
+       signal on USB bus. */
+    if (charger_inserted())
+        return USB_INSERTED;
+    return USB_EXTRACTED;
+}
+
+#ifdef BOOTLOADER
+#include "ata.h"
+void usb_test(void)
+{
+    int rc;
+
+    printf("ATA");
+    rc = ata_init();
+
+    if(rc) {
+        panicf("ata_init failed");
+    }
+
+    usb_init();
+    usb_start_monitoring();
+    usb_acknowledge(SYS_USB_CONNECTED_ACK);
+
+    while (1) {
+        sleep(HZ);
+//        usb_serial_send("Hello\r\n", 7);
+    }
+}
+#endif
+#else
 void usb_init_device(void)
 {
     /* simply switch USB off for now */
@@ -42,3 +777,4 @@ int usb_detect(void)
 {
     return USB_EXTRACTED;
 }
+#endif
diff --git a/firmware/usb.c b/firmware/usb.c
index ab4f0403b9..e5c7565d39 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -50,7 +50,8 @@
 /* Conditions under which we want the entire driver */
 #if !defined(BOOTLOADER) || (CONFIG_CPU == SH7034) || \
      (defined(TOSHIBA_GIGABEAT_S) && defined(USE_ROCKBOX_USB) && defined(USB_STORAGE)) || \
-     (defined(CREATIVE_ZVx) && defined(HAVE_USBSTACK))
+     (defined(HAVE_USBSTACK) && (defined(CREATIVE_ZVx) || \
+     defined(CPU_TCC77X) || defined(CPU_TCC780X)))
 #define USB_FULL_INIT
 #endif