From 9bc94963aefcb5028c3529ff59c974e48d814690 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 23 Dec 2021 21:42:32 -0800
Subject: Intro USB

---
 src/cpu/atomic/swap.h |  1 +
 src/cpu/irq.c         | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

(limited to 'src/cpu')

diff --git a/src/cpu/atomic/swap.h b/src/cpu/atomic/swap.h
index 5e8ff57..374dd97 100644
--- a/src/cpu/atomic/swap.h
+++ b/src/cpu/atomic/swap.h
@@ -6,6 +6,7 @@
 /// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock.h
 /// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock_types.h#L23
 /// https://www.cs.uic.edu/~jbell/CourseNotes/OperatingSystems/3_Processes.html
+/// https://developer.arm.com/documentation/dht0008/a/arm-synchronization-primitives/practical-uses/implementing-a-semaphore?lang=en
 
 static inline void atm_lock(unsigned long pid, unsigned long* addr) {
 	unsigned long tmp, current_lock_value;
diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index f2b326e..e99b398 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -1,5 +1,6 @@
 #include "../cpu/irq.h"
 #include "../drivers/uart.h"
+#include "../drivers/usb.h"
 #include "../graphics/drawer.h"
 #include "../sys/core.h"
 #include "../sys/timer.h"
@@ -92,6 +93,26 @@ void c_irq_handler(void) {
 				enableirq();
 				return;
 			}
+		} else if (load32(IRQ_PENDING1) & (1 << 9))  {
+			unsigned long reg = *USB_CORE_GINTSTS;
+			*USB_CORE_GINTSTS = reg;  //clear
+			g_Drawer.y = 20;
+			write_hex32(&g_Drawer, reg);
+			g_Drawer.x = 0;
+			g_Drawer.y = 0;
+			if (reg & 1 << 28) { uart_string("Connector ID Status Change\n"); }
+			if (reg & 1 << 27) { uart_string("LPM Transaction Received Interrupt\n"); }
+			if (reg & 1 << 26) { uart_string("Periodic TxFIFO Empty\n"); }
+			if (reg & 1 << 25) { uart_string("Host Channels Interrupt\n"); 
+			                   }
+			if (reg & 1 << 24) { *USB_HOST_HPRT |= 1 << 1;  //clear host port interrupt
+			                     uart_string("Host Port Interrupt\n"); }
+			if (reg & 1 <<  6) { uart_string("Global IN Non-periodic NAK Effective\n"); }
+			if (reg & 1 <<  5) { uart_string("Non-periodic TxFIFO Empty\n"); }
+			if (reg & 1 <<  4) { uart_string("Host and Device RxFIFO Non-Empty (RxFLvl) \n"); }
+			if (reg & 1 <<  3) { uart_string("Host and Device Start of Frame\n"); }
+			if (reg & 1 <<  2) { uart_string("OTG Interrupt\n"); }
+			if (reg & 1 <<  1) { uart_string("Mode Mismatch Interrupt\n"); }
 		}
 	} else if (source & (1 << 3)) {
 		c_timer();
-- 
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