fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire

The Aspeed AST2x00 can contain a ColdFire v1 coprocessor which
is currently unused on OpenPower systems.

This adds an alternative to the fsi-master-gpio driver that
uses that coprocessor instead of bit banging from the ARM
core itself. The end result is about 4 times faster.

The firmware for the coprocessor and its source code can be
found at https://github.com/ozbenh/cf-fsi and is system specific.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 150 insertions, 0 deletions

diff --git a/include/trace/events/fsi_master_ast_cf.h b/include/trace/events/fsi_master_ast_cf.h
new file mode 100644
index 000000000000..a0fdfa58622a
--- /dev/null
+++ b/include/trace/events/fsi_master_ast_cf.h
@@ -0,0 +1,150 @@
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fsi_master_ast_cf
+
+#if !defined(_TRACE_FSI_MASTER_ACF_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FSI_MASTER_ACF_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(fsi_master_acf_copro_command,
+	TP_PROTO(const struct fsi_master_acf *master, uint32_t op),
+	TP_ARGS(master, op),
+	TP_STRUCT__entry(
+		__field(int,		master_idx)
+		__field(uint32_t,	op)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->op = op;
+	),
+	TP_printk("fsi-acf%d command %08x",
+		  __entry->master_idx, __entry->op
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_send_request,
+	TP_PROTO(const struct fsi_master_acf *master, const struct fsi_msg *cmd, u8 rbits),
+	TP_ARGS(master, cmd, rbits),
+	TP_STRUCT__entry(
+		__field(int,		master_idx)
+		__field(uint64_t,	msg)
+		__field(u8,		bits)
+		__field(u8,		rbits)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->msg = cmd->msg;
+		__entry->bits = cmd->bits;
+		__entry->rbits = rbits;
+	),
+	TP_printk("fsi-acf%d cmd: %016llx/%d/%d",
+		__entry->master_idx, (unsigned long long)__entry->msg,
+		__entry->bits, __entry->rbits
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_copro_response,
+	TP_PROTO(const struct fsi_master_acf *master, u8 rtag, u8 rcrc, __be32 rdata, bool crc_ok),
+	TP_ARGS(master, rtag, rcrc, rdata, crc_ok),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+		__field(u8,	rtag)
+		__field(u8,	rcrc)
+		__field(u32,    rdata)
+		__field(bool,   crc_ok)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->rtag = rtag;
+		__entry->rcrc = rcrc;
+		__entry->rdata = be32_to_cpu(rdata);
+		__entry->crc_ok = crc_ok;
+	),
+	TP_printk("fsi-acf%d rsp: tag=%04x crc=%04x data=%08x %c\n",
+		__entry->master_idx, __entry->rtag, __entry->rcrc,
+		__entry->rdata, __entry->crc_ok ? ' ' : '!'
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_crc_rsp_error,
+	TP_PROTO(const struct fsi_master_acf *master, int retries),
+	TP_ARGS(master, retries),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+		__field(int,	retries)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->retries = retries;
+	),
+	TP_printk("fsi-acf%d CRC error in response retry %d",
+		__entry->master_idx, __entry->retries
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_poll_response_busy,
+	TP_PROTO(const struct fsi_master_acf *master, int busy_count),
+	TP_ARGS(master, busy_count),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+		__field(int,	busy_count)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->busy_count = busy_count;
+	),
+	TP_printk("fsi-acf%d: device reported busy %d times",
+		__entry->master_idx, __entry->busy_count
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_cmd_abs_addr,
+	TP_PROTO(const struct fsi_master_acf *master, u32 addr),
+	TP_ARGS(master, addr),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+		__field(u32,	addr)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->addr = addr;
+	),
+	TP_printk("fsi-acf%d: Sending ABS_ADR %06x",
+		__entry->master_idx, __entry->addr
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_cmd_rel_addr,
+	TP_PROTO(const struct fsi_master_acf *master, u32 rel_addr),
+	TP_ARGS(master, rel_addr),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+		__field(u32,	rel_addr)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+		__entry->rel_addr = rel_addr;
+	),
+	TP_printk("fsi-acf%d: Sending REL_ADR %03x",
+		__entry->master_idx, __entry->rel_addr
+	)
+);
+
+TRACE_EVENT(fsi_master_acf_cmd_same_addr,
+	TP_PROTO(const struct fsi_master_acf *master),
+	TP_ARGS(master),
+	TP_STRUCT__entry(
+		__field(int,	master_idx)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->master.idx;
+	),
+	TP_printk("fsi-acf%d: Sending SAME_ADR",
+		__entry->master_idx
+	)
+);
+
+#endif /* _TRACE_FSI_MASTER_ACF_H */
+
+#include <trace/define_trace.h>