utils/hwstub: completely rework the protocol, drop unused features

The protocol has evolved a lot during the 2.x.y lifetime, bringing more
features which later got unused. This commit removes all the unused stuff
and simplifies everything:
- drop the feature mask: everything is mandatory or stalled on error
- remove the info request and put all static information in standard USB
  descriptors which are part of the configuration descriptor (and can be
  retrieved using the standard GetDescriptor request).
- remove the USB interface, we had only one anyway
- remove all endpoint descriptors
- remove the exit/atexit stuff, it never worked as intended anyway
- update the hwstub library and make it able to handle any device
- update the tools (mostly renaming and removing of code)

Change-Id: I1872bba7f4177fc3891180e8f944aab88f5bde31

1 files changed, 11 insertions, 48 deletions

diff --git a/utils/hwstub/stub/rk27xx/target.c b/utils/hwstub/stub/rk27xx/target.c
index f9efccaef0..ff2e952909 100644
--- a/utils/hwstub/stub/rk27xx/target.c
+++ b/utils/hwstub/stub/rk27xx/target.c
@@ -33,7 +33,6 @@ enum rk27xx_family_t
 };
 
 static enum rk27xx_family_t g_rk27xx_family = UNKNOWN;
-static int g_atexit = HWSTUB_ATEXIT_OFF;
 
 static void _enable_irq(void)
 {
@@ -43,23 +42,6 @@ static void _enable_irq(void)
                  );
 }
 
-static void power_off(void)
-{
-    GPIO_PCCON &= ~(1<<0);
-    while(1);
-}
-
-static void rk27xx_reset(void)
-{
-    /* use Watchdog to reset */
-    SCU_CLKCFG &= ~CLKCFG_WDT;
-    WDTLR = 1;
-    WDTCON = (1<<4) | (1<<3);
-
-    /* Wait for reboot to kick in */
-    while(1);
-}
-
 /* us may be at most 2^31/200 (~10 seconds) for 200MHz max cpu freq */
 void target_udelay(int us)
 {
@@ -132,41 +114,22 @@ void target_init(void)
     }
 }
 
-static struct usb_resp_info_target_t g_target =
+struct hwstub_target_desc_t __attribute__((aligned(2))) target_descriptor =
 {
-    .id = HWSTUB_TARGET_RK27,
-    .name = "Rockchip RK27XX"
+    sizeof(struct hwstub_target_desc_t),
+    HWSTUB_DT_TARGET,
+    HWSTUB_TARGET_RK27,
+    "Rockchip RK27XX"
 };
 
-int target_get_info(int info, void **buffer)
+void target_get_desc(int desc, void **buffer)
 {
-    if(info == HWSTUB_INFO_TARGET)
-    {
-        *buffer = &g_target;
-        return sizeof(g_target);
-    }
-    else
-        return -1;
+    (void) desc;
+    *buffer = NULL;
 }
 
-int target_atexit(int method)
+void target_get_config_desc(void *buffer, int *size)
 {
-    g_atexit = method;
-    return 0;
-}
-
-void target_exit(void)
-{
-    switch(g_atexit)
-    {
-        case HWSTUB_ATEXIT_OFF:
-            power_off();
-            // fallthrough in case of return
-        case HWSTUB_ATEXIT_REBOOT:
-            rk27xx_reset();
-            // fallthrough in case of return
-        case HWSTUB_ATEXIT_NOP:
-        default:
-            return;
-    }
+    (void) buffer;
+    (void) size;
 }