From 222393467b493ffa5940c717e2d4f7214ea9920d Mon Sep 17 00:00:00 2001
From: "(no author)" <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>
Date: Tue, 12 Sep 2006 16:56:49 +0000
Subject: pio_irq USB access

git-svn-id: https://svn.openpcd.org:2342/trunk@183 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
---
 openpcd/firmware/include/openpcd.h |  3 ++
 openpcd/firmware/src/os/pio_irq.c  | 82 ++++++++++++++++++++++++++++----------
 openpcd/firmware/src/os/req_ctx.h  |  2 +
 3 files changed, 67 insertions(+), 20 deletions(-)

diff --git a/openpcd/firmware/include/openpcd.h b/openpcd/firmware/include/openpcd.h
index 6bd88d3..e6ccebe 100644
--- a/openpcd/firmware/include/openpcd.h
+++ b/openpcd/firmware/include/openpcd.h
@@ -72,6 +72,9 @@ enum openpcd_cmd_class {
 #define OPENPCD_CMD_USBTEST_IN		(0x1|OPENPCD_CLS2CMD(OPENPCD_CMD_CLS_USBTEST))
 #define OPENPCD_CMD_USBTEST_OUT		(0x2|OPENPCD_CLS2CMD(OPENPCD_CMD_CLS_USBTEST))
 
+/* FIXME */
+#define OPENPCD_CMD_PIO_IRQ		(0x3|OPENPCD_CLS2CMD(OPENPCD_CMD_CLS_USBTEST))
+
 
 #define OPENPCD_VENDOR_ID	0x2342
 #define OPENPCD_PRODUCT_ID	0x0001
diff --git a/openpcd/firmware/src/os/pio_irq.c b/openpcd/firmware/src/os/pio_irq.c
index 266512e..8dae806 100644
--- a/openpcd/firmware/src/os/pio_irq.c
+++ b/openpcd/firmware/src/os/pio_irq.c
@@ -2,33 +2,57 @@
 #include <sys/types.h>
 #include <lib_AT91SAM7.h>
 #include <os/pio_irq.h>
+#include <os/dbgu.h>
+#include <os/req_ctx.h>
+#include <openpcd.h>
 
-static irq_handler_t *pio_handlers[NR_PIO];
+struct pioirq_state {
+	irq_handler_t *handlers[NR_PIO];
+	u_int32_t usbmask;
+	u_int32_t usb_throttled; /* atomic? */
+};
 
-#if 0
-static u_int8_t ffs(u_int32_t in)
-{
-	int i;
-
-	for (i = sizeof(in)*8; i > 0; i++) {
-		if (in & (1 << (i-1)))
-			return i;
-	}
-
-	return 0;
-}
-#endif
+static struct pioirq_state pirqs;
 
 static void pio_irq_demux(void)
 {
 	u_int32_t pio = AT91F_PIO_GetInterruptStatus(AT91C_BASE_PIOA);
+	u_int8_t send_usb = 0;
 	int i;
 
+	DEBUGPCRF("PIO_ISR_STATUS = 0x%08x", pio);
+
 	for (i = 0; i < NR_PIO; i++) {
-		if (pio & (1 << i) && pio_handlers[i])
-			pio_handlers[i](i);
+		if (pio & (1 << i) && pirqs.handlers[i])
+			pirqs.handlers[i](i);
+		if (pirqs.usbmask & (1 << i))
+			send_usb = 1;
+	}
+
+	if (send_usb && !pirqs.usb_throttled) {
+		struct req_ctx *irq_rctx;
+		irq_rctx = req_ctx_find_get(RCTX_STATE_FREE,
+					    RCTX_STATE_PIOIRQ_BUSY);
+		if (!irq_rctx) {
+			/* we cannot disable the interrupt, since we have
+			 * non-usb listeners */
+			pirqs.usb_throttled = 1;
+		} else {
+			struct openpcd_hdr *opcdh;
+			u_int32_t *regmask;
+			opcdh = (struct openpcd_hdr *) &irq_rctx->tx.data[0];
+			regmask = (u_int32_t *) (&irq_rctx->tx.data[0] + sizeof(*opcdh));
+			opcdh->cmd = OPENPCD_CMD_PIO_IRQ;
+			opcdh->reg = 0x00;
+			opcdh->flags = 0x00;
+			opcdh->val = 0x00;
+
+			irq_rctx->tx.tot_len = sizeof(*opcdh) + sizeof(u_int32_t);
+			req_ctx_set_state(irq_rctx, RCTX_STATE_UDP_EP3_PENDING);
+		}
 	}
-	return;
+
+	AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
 }
 
 void pio_irq_enable(u_int32_t pio)
@@ -49,12 +73,12 @@ int pio_irq_register(u_int32_t pio, irq_handler_t *handler)
 		return -EINVAL;
 	num--;
 
-	if (pio_handlers[num])
+	if (pirqs.handlers[num])
 		return -EBUSY;
 
 	pio_irq_disable(pio);
 	AT91F_PIO_CfgInput(AT91C_BASE_PIOA, pio);
-	pio_handlers[num] = handler;
+	pirqs.handlers[num] = handler;
 
 	return 0;
 }
@@ -68,11 +92,29 @@ void pio_irq_unregister(u_int32_t pio)
 	num--;
 
 	pio_irq_disable(pio);
-	pio_handlers[num] = NULL;
+	pirqs.handlers[num] = NULL;
+}
+
+static int pio_irq_usb_in(struct req_ctx *rctx)
+{
+	struct openpcd_hdr *poh = (struct openpcd_hdr *) &rctx->rx.data[0];
+	struct openpcd_hdr *pih = (struct openpcd_hdr *) &rctx->tx.data[0];
+
+	switch (poh->cmd) {
+	case OPENPCD_CMD_PIO_IRQ:
+		pirqs.usbmask = poh->val;
+		break;
+	default:
+		DEBUGP("UNKNOWN ");
+		return -EINVAL;
+	}
+
+	return 0;
 }
 
 void pio_irq_init(void)
 {
+	AT91F_PIOA_CfgPMC();
 	AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_PIOA,
 			      AT91C_AIC_PRIOR_LOWEST,
 			      AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &pio_irq_demux);
diff --git a/openpcd/firmware/src/os/req_ctx.h b/openpcd/firmware/src/os/req_ctx.h
index f57f02f..82a133f 100644
--- a/openpcd/firmware/src/os/req_ctx.h
+++ b/openpcd/firmware/src/os/req_ctx.h
@@ -37,6 +37,8 @@ struct req_ctx {
 
 #define RCTX_STATE_SSC_RX_BUSY		0x20
 
+#define RCTX_STATE_PIOIRQ_BUSY		0x80
+
 #define NUM_REQ_CTX	8
 extern struct req_ctx *req_ctx_find_get(unsigned long old_state, unsigned long new_state);
 extern struct req_ctx *req_ctx_find_busy(void);
-- 
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