From 8e633385912494ff5e871ec4c264d3a7db46fb98 Mon Sep 17 00:00:00 2001
From: Marcin Bukat <marcin.bukat@gmail.com>
Date: Thu, 18 Jul 2013 23:55:35 +0200
Subject: hwstub rk27xx port

Change-Id: I85ac57117911544b65ccd56eb16303e30be67cab
---
 utils/hwstub/stub/rk27xx/target.c | 172 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 utils/hwstub/stub/rk27xx/target.c

(limited to 'utils/hwstub/stub/rk27xx/target.c')

diff --git a/utils/hwstub/stub/rk27xx/target.c b/utils/hwstub/stub/rk27xx/target.c
new file mode 100644
index 0000000000..f9efccaef0
--- /dev/null
+++ b/utils/hwstub/stub/rk27xx/target.c
@@ -0,0 +1,172 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2013 by Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "stddef.h"
+#include "target.h"
+#include "system.h"
+#include "logf.h"
+#include "rk27xx.h"
+
+#define HZ  1000000
+
+enum rk27xx_family_t
+{
+    UNKNOWN,
+    REV_A,
+    REV_B,
+};
+
+static enum rk27xx_family_t g_rk27xx_family = UNKNOWN;
+static int g_atexit = HWSTUB_ATEXIT_OFF;
+
+static void _enable_irq(void)
+{
+    asm volatile ("mrs r0, cpsr\n"
+                  "bic r0, r0, #0x80\n"
+                  "msr cpsr_c, r0\n"
+                 );
+}
+
+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)
+{
+    unsigned cycles_per_us;
+    unsigned delay;
+
+    cycles_per_us = (200000000 + 999999) / 1000000;
+
+    delay = (us * cycles_per_us) / 5;
+
+    asm volatile(
+        "1: subs %0, %0, #1  \n"    /* 1 cycle  */
+        "   nop              \n"    /* 1 cycle  */
+        "   bne  1b          \n"    /* 3 cycles */
+        : : "r"(delay)
+    );
+}
+
+void target_mdelay(int ms)
+{
+    return target_udelay(ms * 1000);
+}
+
+void target_init(void)
+{
+    /* ungate all clocks */
+    SCU_CLKCFG = 0;
+
+    /* keep act line */
+    GPIO_PCDR |= (1<<0);
+    GPIO_PCCON |= (1<<0);
+
+    /* disable watchdog */
+    WDTCON &= ~(1<<3);
+
+    /* enable UDC interrupt */
+    INTC_IMR = (1<<16);
+    INTC_IECR = (1<<16);
+
+    EN_INT = EN_SUSP_INTR   |  /* Enable Suspend Interrupt */
+             EN_RESUME_INTR |  /* Enable Resume Interrupt */
+             EN_USBRST_INTR |  /* Enable USB Reset Interrupt */
+             EN_OUT0_INTR   |  /* Enable OUT Token receive Interrupt EP0 */
+             EN_IN0_INTR    |  /* Enable IN Token transmits Interrupt EP0 */
+             EN_SETUP_INTR;    /* Enable SETUP Packet Receive Interrupt */
+
+    /* 6. configure INTCON */
+    INTCON = UDC_INTHIGH_ACT |  /* interrupt high active */
+             UDC_INTEN;         /* enable EP0 interrupts */
+
+    /* enable irq */
+    _enable_irq();
+
+    /* detect revision */
+    uint32_t rk27xx_id = SCU_ID;
+
+    if(rk27xx_id == 0xa1000604)
+    {
+        logf("identified rk27xx REV_A \n");
+        g_rk27xx_family = REV_A;
+    }
+    else if(rk27xx_id == 0xa100027b)
+    {
+        logf("identified rk27xx REV_B \n");
+        g_rk27xx_family = REV_B;
+    }
+    else
+    {
+        logf("unknown rk27xx revision \n");
+    }
+}
+
+static struct usb_resp_info_target_t g_target =
+{
+    .id = HWSTUB_TARGET_RK27,
+    .name = "Rockchip RK27XX"
+};
+
+int target_get_info(int info, void **buffer)
+{
+    if(info == HWSTUB_INFO_TARGET)
+    {
+        *buffer = &g_target;
+        return sizeof(g_target);
+    }
+    else
+        return -1;
+}
+
+int target_atexit(int method)
+{
+    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;
+    }
+}
-- 
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