fsi: aspeed: Add trace points

These trace points help with debugging the FSI master. They show the low
level reads, writes and error states of the master.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20191108051945.7109-11-joel@jms.id.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/fsi/fsi-master-aspeed.c

@@ -77,6 +77,9 @@ static const u32 fsi_base = 0xa0000000;
 #define XFER_HALFWORD	(BIT(0))
 #define XFER_BYTE	(0)
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/fsi_master_aspeed.h>
+
 #define FSI_LINK_ENABLE_SETUP_TIME	10	/* in mS */
 
 #define DEFAULT_DIVISOR			14
@@ -102,6 +105,8 @@ static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
 
 	status = readl(base + OPB0_STATUS);
 
+	trace_fsi_master_aspeed_opb_write(addr, val, transfer_size, status, reg);
+
 	/* Return error when poll timed out */
 	if (ret)
 		return ret;
@@ -149,6 +154,10 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 
 	result = readl(base + OPB0_FSI_DATA_R);
 
+	trace_fsi_master_aspeed_opb_read(addr, transfer_size, result,
+			readl(base + OPB0_STATUS),
+			reg);
+
 	/* Return error when poll timed out */
 	if (ret)
 		return ret;
@@ -196,6 +205,19 @@ static int check_errors(struct fsi_master_aspeed *aspeed, int err)
 {
 	int ret;
 
+	if (trace_fsi_master_aspeed_opb_error_enabled()) {
+		__be32 mresp0, mstap0, mesrb0;
+
+		opb_readl(aspeed, ctrl_base + FSI_MRESP0, &mresp0);
+		opb_readl(aspeed, ctrl_base + FSI_MSTAP0, &mstap0);
+		opb_readl(aspeed, ctrl_base + FSI_MESRB0, &mesrb0);
+
+		trace_fsi_master_aspeed_opb_error(
+				be32_to_cpu(mresp0),
+				be32_to_cpu(mstap0),
+				be32_to_cpu(mesrb0));
+	}
+
 	if (err == -EIO) {
 		/* Check MAEB (0x70) ? */
 

include/trace/events/fsi_master_aspeed.h

@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fsi_master_aspeed
+
+#if !defined(_TRACE_FSI_MASTER_ASPEED_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FSI_MASTER_ASPEED_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(fsi_master_aspeed_opb_read,
+	TP_PROTO(uint32_t addr, size_t size, uint32_t result, uint32_t status, uint32_t irq_status),
+	TP_ARGS(addr, size, result, status, irq_status),
+	TP_STRUCT__entry(
+		__field(uint32_t,  addr)
+		__field(size_t,    size)
+		__field(uint32_t,  result)
+		__field(uint32_t,  status)
+		__field(uint32_t,  irq_status)
+		),
+	TP_fast_assign(
+		__entry->addr = addr;
+		__entry->size = size;
+		__entry->result = result;
+		__entry->status = status;
+		__entry->irq_status = irq_status;
+		),
+	TP_printk("addr %08x size %zu: result %08x sts: %08x irq_sts: %08x",
+		__entry->addr, __entry->size, __entry->result,
+		__entry->status, __entry->irq_status
+	   )
+);
+
+TRACE_EVENT(fsi_master_aspeed_opb_write,
+	TP_PROTO(uint32_t addr, uint32_t val, size_t size, uint32_t status, uint32_t irq_status),
+	TP_ARGS(addr, val, size, status, irq_status),
+	TP_STRUCT__entry(
+		__field(uint32_t,    addr)
+		__field(uint32_t,    val)
+		__field(size_t,    size)
+		__field(uint32_t,  status)
+		__field(uint32_t,  irq_status)
+		),
+	TP_fast_assign(
+		__entry->addr = addr;
+		__entry->val = val;
+		__entry->size = size;
+		__entry->status = status;
+		__entry->irq_status = irq_status;
+		),
+	TP_printk("addr %08x val %08x size %zu status: %08x irq_sts: %08x",
+		__entry->addr, __entry->val, __entry->size,
+		__entry->status, __entry->irq_status
+		)
+	);
+
+TRACE_EVENT(fsi_master_aspeed_opb_error,
+	TP_PROTO(uint32_t mresp0, uint32_t mstap0, uint32_t mesrb0),
+	TP_ARGS(mresp0, mstap0, mesrb0),
+	TP_STRUCT__entry(
+		__field(uint32_t,  mresp0)
+		__field(uint32_t,  mstap0)
+		__field(uint32_t,  mesrb0)
+		),
+	TP_fast_assign(
+		__entry->mresp0 = mresp0;
+		__entry->mstap0 = mstap0;
+		__entry->mesrb0 = mesrb0;
+		),
+	TP_printk("mresp0 %08x mstap0 %08x mesrb0 %08x",
+		__entry->mresp0, __entry->mstap0, __entry->mesrb0
+		)
+	);
+
+#endif
+
+#include <trace/define_trace.h>