From 460ece8365600e1a8fdb124c2f68de6aabf1fa62 Mon Sep 17 00:00:00 2001
From: laforge <laforge@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>
Date: Sat, 23 Sep 2006 14:49:43 +0000
Subject: - Implement runtime DFU switching and reset-after-update. This means 
  we can now reflash without any buttons or replugging of the device

git-svn-id: https://svn.openpcd.org:2342/trunk@222 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
---
 firmware/src/dfu/dfu.c        | 34 +++++++++++++++++-----------------
 firmware/src/start/Cstartup.S | 24 ++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 17 deletions(-)

(limited to 'firmware')

diff --git a/firmware/src/dfu/dfu.c b/firmware/src/dfu/dfu.c
index 7e7c575..56f7ef0 100644
--- a/firmware/src/dfu/dfu.c
+++ b/firmware/src/dfu/dfu.c
@@ -195,7 +195,7 @@ static void __dfufunc udp_ep0_send_stall(void)
 
 static u_int8_t *ptr = (u_int8_t *) AT91C_IFLASH + SAM7DFU_SIZE;
 static __dfudata u_int8_t dfu_status;
-static __dfudata u_int32_t dfu_state = DFU_STATE_appIDLE;
+__dfudata u_int32_t dfu_state = DFU_STATE_appIDLE;
 static u_int32_t pagebuf32[AT91C_IFLASH_PAGE_SIZE/4];
 
 static int __dfufunc handle_dnload(u_int16_t val, u_int16_t len)
@@ -376,9 +376,9 @@ int __dfufunc dfu_ep0_handler(u_int8_t req_type, u_int8_t req,
 				ret = RET_STALL;
 				goto out;
 			}
+			dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 			ptr = (u_int8_t *) AT91C_IFLASH + SAM7DFU_SIZE;
 			ret = handle_dnload(val, len);
-			dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 			break;
 		case USB_REQ_DFU_UPLOAD:
 			ptr = (u_int8_t *) AT91C_IFLASH + SAM7DFU_SIZE;
@@ -433,8 +433,8 @@ int __dfufunc dfu_ep0_handler(u_int8_t req_type, u_int8_t req,
 	case DFU_STATE_dfuDNLOAD_IDLE:
 		switch (req) {
 		case USB_REQ_DFU_DNLOAD:
-			ret = handle_dnload(val, len);
 			dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
+			ret = handle_dnload(val, len);
 			break;
 		case USB_REQ_DFU_ABORT:
 			dfu_state = DFU_STATE_dfuIDLE;
@@ -798,6 +798,14 @@ static __dfufunc void dfu_udp_irq(void)
 		/* Configure endpoint 0 */
 		pUDP->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
 		cur_config = 0;
+
+		if (dfu_state == DFU_STATE_dfuMANIFEST_WAIT_RST ||
+		    dfu_state == DFU_STATE_dfuMANIFEST) {
+			AT91F_RSTSoftReset(AT91C_BASE_RSTC, AT91C_RSTC_PROCRST|
+					   		    AT91C_RSTC_PERRST|
+							    AT91C_RSTC_EXTRST);
+		}
+			
 	}
 
 	if (isr & AT91C_UDP_EPINT0)
@@ -817,22 +825,14 @@ static void dfu_switch(void)
 	AT91PS_AIC pAic = AT91C_BASE_AIC;
 
 	DEBUGE("\r\nsam7dfu: switching to DFU mode\r\n");
-	AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPCD_PIO_LED1);
-	AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPCD_PIO_LED2);
-	led1off();
-	led2off();
-
-	flash_init();
 
-	/* disable all non-usb (and non-dbgu) interrupts */
-	pAic->AIC_IDCR = ~((1 << AT91C_ID_UDP)|(1 << AT91C_ID_SYS));
+	dfu_state = DFU_STATE_appDETACH;
+	AT91F_RSTSoftReset(AT91C_BASE_RSTC, AT91C_RSTC_PROCRST|
+			   AT91C_RSTC_PERRST|AT91C_RSTC_EXTRST);
 
-	pAic->AIC_SVR[AT91C_ID_UDP] = (unsigned int) &dfu_udp_irq;
-	dfu_state = DFU_STATE_dfuIDLE;
-	dfu_status = DFU_STATUS_OK;
-	//AT91F_DBGU_Printk("You may now start the DFU up/download process\r\n");
-	AT91F_DBGU_Printk("\r\nTHIS DOES NOT WORK YET, "
-			  " PLEASE PUSH THE BUTTON WHILE POWERING UP\r\n");
+	/* We should never reach here, but anyway avoid returning to the
+	 * caller since he doesn't expect us to do so */
+	while (1) ;
 }
 
 void __dfufunc dfu_main(void)
diff --git a/firmware/src/start/Cstartup.S b/firmware/src/start/Cstartup.S
index a750039..990dbcb 100644
--- a/firmware/src/start/Cstartup.S
+++ b/firmware/src/start/Cstartup.S
@@ -35,8 +35,12 @@
 //*- 1.1 01/Apr/05 JPP    : save SPSR 
 //*-----------------------------------------------------------------------------*/
 
+/* Enable DFU by press of hardware POI_BOOTLDR switch */
 #define CONFIG_DFU_SWITCH
 
+/* Enable DFU by magic value in RAM and software reset */
+#define CONFIG_DFU_MAGIC
+
 //#define DEBUG_LL
 
 #ifdef DEBUG_LL
@@ -301,6 +305,12 @@ InitReset:
           .EQU		I_BIT,              0x80
           .EQU		F_BIT,              0x40
 
+
+#define AT91C_RSTC_RSR			0xFFFFFD04
+#define AT91C_RSTC_RSTTYP_SOFTWARE	(0x03 << 8)
+#define DFU_STATE_appDETACH		1
+
+
 /*------------------------------------------------------------------------------
 //*- Setup the stack for each mode
 //*-------------------------------*/
@@ -319,6 +329,20 @@ InitReset:
                 msr     CPSR_c, #ARM_MODE_SVC
                 mov     r13, r0                     /* Init stack Sup */
 
+#ifdef CONFIG_DFU_MAGIC
+		ldr	r1, =AT91C_RSTC_RSR
+		ldr	r2, [r1]
+		#and	r2, r2, AT91C_RSTC_RSTTYP
+		tst	r2, #AT91C_RSTC_RSTTYP_SOFTWARE
+		beq	dfu_magic_end
+
+		ldr	r1, =dfu_state
+		ldr	r2, [r1]
+		cmp	r2, #DFU_STATE_appDETACH
+		beq	_reloc_dfu
+dfu_magic_end:
+#endif
+
 # Relocate DFU .data.shared section (Copy from ROM to RAM)
                 LDR     R1, =_etext
                 LDR     R2, =_data_shared
-- 
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