firewire: Handle access to CSR resources on local node.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-ohci.c

@@ -540,38 +540,136 @@ at_context_init(struct at_context *ctx, struct fw_ohci *ohci, u32 control_set)
 }
 
 #define header_get_destination(q)	(((q) >> 16) & 0xffff)
+#define header_get_tcode(q)		(((q) >> 4) & 0x0f)
+#define header_get_offset_high(q)	(((q) >> 0) & 0xffff)
+#define header_get_data_length(q)	(((q) >> 16) & 0xffff)
+#define header_get_extended_tcode(q)	(((q) >> 0) & 0xffff)
+
+static void
+handle_local_rom(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
+{
+	struct fw_packet response;
+	int tcode, length, i;
+
+	tcode = header_get_tcode(packet->header[0]);
+	if (TCODE_IS_BLOCK_PACKET(tcode))
+		length = header_get_data_length(packet->header[3]);
+	else
+		length = 4;
+
+	i = csr - CSR_CONFIG_ROM;
+	if (i + length > CONFIG_ROM_SIZE) {
+		fw_fill_response(&response, packet->header,
+				 RCODE_ADDRESS_ERROR, NULL, 0);
+	} else if (!TCODE_IS_READ_REQUEST(tcode)) {
+		fw_fill_response(&response, packet->header,
+				 RCODE_TYPE_ERROR, NULL, 0);
+	} else {
+		fw_fill_response(&response, packet->header, RCODE_COMPLETE,
+				 (void *) ohci->config_rom + i, length);
+	}
+
+	fw_core_handle_response(&ohci->card, &response);
+}
+
+static void
+handle_local_lock(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
+{
+	struct fw_packet response;
+	int tcode, length, ext_tcode, sel;
+	__be32 *payload, lock_old;
+	u32 lock_arg, lock_data;
+
+	tcode = header_get_tcode(packet->header[0]);
+	length = header_get_data_length(packet->header[3]);
+	payload = packet->payload;
+	ext_tcode = header_get_extended_tcode(packet->header[3]);
+
+	if (tcode == TCODE_LOCK_REQUEST &&
+	    ext_tcode == EXTCODE_COMPARE_SWAP && length == 8) {
+		lock_arg = be32_to_cpu(payload[0]);
+		lock_data = be32_to_cpu(payload[1]);
+	} else if (tcode == TCODE_READ_QUADLET_REQUEST) {
+		lock_arg = 0;
+		lock_data = 0;
+	} else {
+		fw_fill_response(&response, packet->header,
+				 RCODE_TYPE_ERROR, NULL, 0);
+		goto out;
+	}
+
+	sel = (csr - CSR_BUS_MANAGER_ID) / 4;
+	reg_write(ohci, OHCI1394_CSRData, lock_data);
+	reg_write(ohci, OHCI1394_CSRCompareData, lock_arg);
+	reg_write(ohci, OHCI1394_CSRControl, sel);
+
+	if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000)
+		lock_old = cpu_to_be32(reg_read(ohci, OHCI1394_CSRData));
+	else
+		fw_notify("swap not done yet\n");
+
+	fw_fill_response(&response, packet->header,
+			 RCODE_COMPLETE, &lock_old, sizeof lock_old);
+ out:
+	fw_core_handle_response(&ohci->card, &response);
+}
+
+static void
+handle_local_request(struct at_context *ctx, struct fw_packet *packet)
+{
+	u64 offset;
+	u32 csr;
+
+	packet->ack = ACK_PENDING;
+	packet->callback(packet, &ctx->ohci->card, packet->ack);
+
+	offset =
+		((unsigned long long)
+		 header_get_offset_high(packet->header[1]) << 32) |
+		packet->header[2];
+	csr = offset - CSR_REGISTER_BASE;
+
+	/* Handle config rom reads. */
+	if (csr >= CSR_CONFIG_ROM && csr < CSR_CONFIG_ROM_END)
+		handle_local_rom(ctx->ohci, packet, csr);
+	else switch (csr) {
+	case CSR_BUS_MANAGER_ID:
+	case CSR_BANDWIDTH_AVAILABLE:
+	case CSR_CHANNELS_AVAILABLE_HI:
+	case CSR_CHANNELS_AVAILABLE_LO:
+		handle_local_lock(ctx->ohci, packet, csr);
+		break;
+	default:
+		if (ctx == &ctx->ohci->at_request_ctx)
+			fw_core_handle_request(&ctx->ohci->card, packet);
+		else
+			fw_core_handle_response(&ctx->ohci->card, packet);
+		break;
+	}
+}
 
 static void
 at_context_transmit(struct at_context *ctx, struct fw_packet *packet)
 {
 	LIST_HEAD(list);
 	unsigned long flags;
-	int local;
 
 	spin_lock_irqsave(&ctx->ohci->lock, flags);
 
 	if (header_get_destination(packet->header[0]) == ctx->ohci->node_id &&
 	    ctx->ohci->generation == packet->generation) {
-		local = 1;
-	} else {
+		spin_unlock_irqrestore(&ctx->ohci->lock, flags);
+		handle_local_request(ctx, packet);
+		return;
+	}
+
 	list_add_tail(&packet->link, &ctx->list);
 	if (ctx->list.next == &packet->link)
 		at_context_setup_packet(ctx, &list);
-		local = 0;
-	}
 
 	spin_unlock_irqrestore(&ctx->ohci->lock, flags);
 
 	do_packet_callbacks(ctx->ohci, &list);
-
-	if (local) {
-		packet->ack = ACK_PENDING;
-		packet->callback(packet, &ctx->ohci->card, packet->ack);
-		if (ctx == &ctx->ohci->at_request_ctx)
-			fw_core_handle_request(&ctx->ohci->card, packet);
-		else
-			fw_core_handle_response(&ctx->ohci->card, packet);
-	}
 }
 
 static void bus_reset_tasklet(unsigned long data)

drivers/firewire/fw-transaction.c

@@ -425,7 +425,7 @@ free_response_callback(struct fw_packet *packet,
 	kfree(request);
 }
 
-static void
+void
 fw_fill_response(struct fw_packet *response, u32 *request_header,
 		 int rcode, void *payload, size_t length)
 {
@@ -457,7 +457,10 @@ fw_fill_response(struct fw_packet *response, u32 *request_header,
 	case TCODE_READ_QUADLET_REQUEST:
 		response->header[0] |=
 			header_tcode(TCODE_READ_QUADLET_RESPONSE);
+		if (payload != NULL)
 			response->header[3] = *(u32 *)payload;
+		else
+			response->header[3] = 0;
 		response->header_length = 16;
 		response->payload_length = 0;
 		break;
@@ -478,6 +481,7 @@ fw_fill_response(struct fw_packet *response, u32 *request_header,
 		return;
 	}
 }
+EXPORT_SYMBOL(fw_fill_response);
 
 static struct fw_request *
 allocate_request(struct fw_packet *p)
@@ -529,9 +533,9 @@ allocate_request(struct fw_packet *p)
 	request->response.generation = p->generation;
 	request->response.callback = free_response_callback;
 	request->ack = p->ack;
-	request->length = p->payload_length;
+	request->length = length;
 	if (data)
-		memcpy(request->data, p->payload, p->payload_length);
+		memcpy(request->data, p->payload, length);
 
 	memcpy(request->request_header, p->header, sizeof p->header);
 
@@ -656,7 +660,7 @@ fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 
 	case TCODE_READ_BLOCK_RESPONSE:
 	case TCODE_LOCK_RESPONSE:
-		data = &p->header[4];
+		data = p->payload;
 		data_length = header_get_data_length(p->header[3]);
 		break;
 

drivers/firewire/fw-transaction.h

@@ -40,6 +40,7 @@
 #define TCODE_STREAM_DATA		10
 #define TCODE_LOCK_RESPONSE		11
 
+#define TCODE_IS_READ_REQUEST(tcode)	(((tcode) & ~1) == 4)
 #define TCODE_IS_BLOCK_PACKET(tcode)	(((tcode) &  1) != 0)
 #define TCODE_IS_REQUEST(tcode)		(((tcode) &  2) == 0)
 #define TCODE_IS_RESPONSE(tcode)	(((tcode) &  2) != 0)
@@ -103,6 +104,34 @@
 #define PHY_PACKET_LINK_ON	0x1
 #define PHY_PACKET_SELF_ID	0x2
 
+#define CSR_REGISTER_BASE		0xfffff0000000ULL
+
+/* register offsets relative to CSR_REGISTER_BASE */
+#define CSR_STATE_CLEAR			0x0
+#define CSR_STATE_SET			0x4
+#define CSR_NODE_IDS			0x8
+#define CSR_RESET_START			0xc
+#define CSR_SPLIT_TIMEOUT_HI		0x18
+#define CSR_SPLIT_TIMEOUT_LO		0x1c
+#define CSR_CYCLE_TIME			0x200
+#define CSR_BUS_TIME			0x204
+#define CSR_BUSY_TIMEOUT		0x210
+#define CSR_BUS_MANAGER_ID		0x21c
+#define CSR_BANDWIDTH_AVAILABLE		0x220
+#define CSR_CHANNELS_AVAILABLE		0x224
+#define CSR_CHANNELS_AVAILABLE_HI	0x224
+#define CSR_CHANNELS_AVAILABLE_LO	0x228
+#define CSR_BROADCAST_CHANNEL		0x234
+#define CSR_CONFIG_ROM			0x400
+#define CSR_CONFIG_ROM_END		0x800
+#define CSR_FCP_COMMAND			0xB00
+#define CSR_FCP_RESPONSE		0xD00
+#define CSR_FCP_END			0xF00
+#define CSR_TOPOLOGY_MAP		0x1000
+#define CSR_TOPOLOGY_MAP_END		0x1400
+#define CSR_SPEED_MAP			0x2000
+#define CSR_SPEED_MAP_END		0x3000
+
 #define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args)
 #define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
 #define fw_debug(s, args...) printk(KERN_DEBUG KBUILD_MODNAME ": " s, ## args)
@@ -227,6 +256,8 @@ extern const struct fw_address_region fw_unit_space_region;
 int fw_core_add_address_handler(struct fw_address_handler *handler,
 				const struct fw_address_region *region);
 void fw_core_remove_address_handler(struct fw_address_handler *handler);
+void fw_fill_response(struct fw_packet *response, u32 *request_header,
+		      int rcode, void *payload, size_t length);
 void fw_send_response(struct fw_card *card,
 		      struct fw_request *request, int rcode);