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authorChalapathi V <chalapathi.v@linux.ibm.com>2025-03-03 08:13:26 -0600
committerNicholas Piggin <npiggin@gmail.com>2025-03-11 22:43:31 +1000
commitf1f756f305981c24a37a0be3113c2326a28594a5 (patch)
treec99d56fbe9776f0ec11336fa713dfc8c8e6890f1
parent17befecda85d585c5b0186af3c4e74fb8b82cbce (diff)
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hw/ssi/pnv_spi: Use local var seq_index instead of get_seq_index().
Use a local variable seq_index instead of repeatedly calling get_seq_index() method and open-code next_sequencer_fsm(). Signed-off-by: Chalapathi V <chalapathi.v@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Message-ID: <20250303141328.23991-3-chalapathi.v@linux.ibm.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Diffstat
-rw-r--r--hw/ssi/pnv_spi.c97
1 files changed, 52 insertions, 45 deletions
diff --git a/hw/ssi/pnv_spi.c b/hw/ssi/pnv_spi.c
index 388b425..de33542 100644
--- a/hw/ssi/pnv_spi.c
+++ b/hw/ssi/pnv_spi.c
@@ -227,18 +227,6 @@ static void transfer(PnvSpi *s)
fifo8_reset(&s->rx_fifo);
}
-static inline uint8_t get_seq_index(PnvSpi *s)
-{
- return GETFIELD(SPI_STS_SEQ_INDEX, s->status);
-}
-
-static inline void next_sequencer_fsm(PnvSpi *s)
-{
- uint8_t seq_index = get_seq_index(s);
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status, (seq_index + 1));
- s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_INDEX_INCREMENT);
-}
-
/*
* Calculate the N1 counters based on passed in opcode and
* internal register values.
@@ -664,6 +652,7 @@ static void operation_sequencer(PnvSpi *s)
bool stop = false; /* Flag to stop the sequencer */
uint8_t opcode = 0;
uint8_t masked_opcode = 0;
+ uint8_t seq_index;
/*
* Clear the sequencer FSM error bit - general_SPI_status[3]
@@ -678,11 +667,16 @@ static void operation_sequencer(PnvSpi *s)
s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status, 0);
}
/*
+ * SPI_STS_SEQ_INDEX of status register is kept in seq_index variable and
+ * updated back to status register at the end of operation_sequencer().
+ */
+ seq_index = GETFIELD(SPI_STS_SEQ_INDEX, s->status);
+ /*
* There are only 8 possible operation IDs to iterate through though
* some operations may cause more than one frame to be sequenced.
*/
- while (get_seq_index(s) < NUM_SEQ_OPS) {
- opcode = s->seq_op[get_seq_index(s)];
+ while (seq_index < NUM_SEQ_OPS) {
+ opcode = s->seq_op[seq_index];
/* Set sequencer state to decode */
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_DECODE);
/*
@@ -699,7 +693,7 @@ static void operation_sequencer(PnvSpi *s)
case SEQ_OP_STOP:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
/* A stop operation in any position stops the sequencer */
- trace_pnv_spi_sequencer_op("STOP", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("STOP", seq_index);
stop = true;
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status, FSM_IDLE);
@@ -710,7 +704,7 @@ static void operation_sequencer(PnvSpi *s)
case SEQ_OP_SELECT_SLAVE:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("SELECT_SLAVE", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("SELECT_SLAVE", seq_index);
/*
* This device currently only supports a single responder
* connection at position 0. De-selecting a responder is fine
@@ -721,8 +715,7 @@ static void operation_sequencer(PnvSpi *s)
if (s->responder_select == 0) {
trace_pnv_spi_shifter_done();
qemu_set_irq(s->cs_line[0], 1);
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status,
- (get_seq_index(s) + 1));
+ seq_index++;
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status, FSM_DONE);
} else if (s->responder_select != 1) {
qemu_log_mask(LOG_GUEST_ERROR, "Slave selection other than 1 "
@@ -747,13 +740,15 @@ static void operation_sequencer(PnvSpi *s)
* applies once a valid responder select has occurred.
*/
s->shift_n1_done = false;
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
}
break;
case SEQ_OP_SHIFT_N1:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("SHIFT_N1", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("SHIFT_N1", seq_index);
/*
* Only allow a shift_n1 when the state is not IDLE or DONE.
* In either of those two cases the sequencer is not in a proper
@@ -785,8 +780,9 @@ static void operation_sequencer(PnvSpi *s)
* transmission to the responder without requiring a refill of
* the TDR between the two operations.
*/
- if (PNV_SPI_MASKED_OPCODE(s->seq_op[get_seq_index(s) + 1])
- == SEQ_OP_SHIFT_N2) {
+ if ((seq_index != 7) &&
+ PNV_SPI_MASKED_OPCODE(s->seq_op[(seq_index + 1)]) ==
+ SEQ_OP_SHIFT_N2) {
send_n1_alone = false;
}
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status, FSM_SHIFT_N1);
@@ -806,9 +802,8 @@ static void operation_sequencer(PnvSpi *s)
if (GETFIELD(SPI_STS_TDR_UNDERRUN, s->status)) {
s->shift_n1_done = true;
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status,
- FSM_SHIFT_N2);
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status,
- (get_seq_index(s) + 1));
+ FSM_SHIFT_N2);
+ seq_index++;
} else {
/*
* This is case (1) or (2) so the sequencer needs to
@@ -819,14 +814,16 @@ static void operation_sequencer(PnvSpi *s)
} else {
/* Ok to move on to the next index */
s->shift_n1_done = true;
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
}
}
break;
case SEQ_OP_SHIFT_N2:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("SHIFT_N2", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("SHIFT_N2", seq_index);
if (!s->shift_n1_done) {
qemu_log_mask(LOG_GUEST_ERROR, "Shift_N2 is not allowed if a "
"Shift_N1 is not done, shifter state = 0x%llx",
@@ -851,14 +848,16 @@ static void operation_sequencer(PnvSpi *s)
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status, FSM_WAIT);
} else {
/* Ok to move on to the next index */
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
}
}
break;
case SEQ_OP_BRANCH_IFNEQ_RDR:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_RDR", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_RDR", seq_index);
/*
* The memory mapping register RDR match value is compared against
* the 16 rightmost bytes of the RDR (potentially with masking).
@@ -874,15 +873,16 @@ static void operation_sequencer(PnvSpi *s)
if (rdr_matched) {
trace_pnv_spi_RDR_match("success");
/* A match occurred, increment the sequencer index. */
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
} else {
trace_pnv_spi_RDR_match("failed");
/*
* Branch the sequencer to the index coded into the op
* code.
*/
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status,
- PNV_SPI_OPCODE_LO_NIBBLE(opcode));
+ seq_index = PNV_SPI_OPCODE_LO_NIBBLE(opcode);
}
/*
* Regardless of where the branch ended up we want the
@@ -901,12 +901,13 @@ static void operation_sequencer(PnvSpi *s)
case SEQ_OP_TRANSFER_TDR:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
qemu_log_mask(LOG_GUEST_ERROR, "Transfer TDR is not supported\n");
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_INDEX_INCREMENT);
break;
case SEQ_OP_BRANCH_IFNEQ_INC_1:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_INC_1", get_seq_index(s));
+ trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_INC_1", seq_index);
/*
* The spec says the loop should execute count compare + 1 times.
* However we learned from engineering that we really only loop
@@ -920,19 +921,21 @@ static void operation_sequencer(PnvSpi *s)
* mask off all but the first three bits so we don't try to
* access beyond the sequencer_operation_reg boundary.
*/
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status,
- PNV_SPI_OPCODE_LO_NIBBLE(opcode));
+ seq_index = PNV_SPI_OPCODE_LO_NIBBLE(opcode);
s->loop_counter_1++;
} else {
/* Continue to next index if loop counter is reached */
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
}
break;
case SEQ_OP_BRANCH_IFNEQ_INC_2:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
- trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_INC_2", get_seq_index(s));
- uint8_t condition2 = GETFIELD(SPI_CTR_CFG_CMP2, s->regs[SPI_CTR_CFG_REG]);
+ trace_pnv_spi_sequencer_op("BRANCH_IFNEQ_INC_2", seq_index);
+ uint8_t condition2 = GETFIELD(SPI_CTR_CFG_CMP2,
+ s->regs[SPI_CTR_CFG_REG]);
/*
* The spec says the loop should execute count compare + 1 times.
* However we learned from engineering that we really only loop
@@ -945,19 +948,21 @@ static void operation_sequencer(PnvSpi *s)
* mask off all but the first three bits so we don't try to
* access beyond the sequencer_operation_reg boundary.
*/
- s->status = SETFIELD(SPI_STS_SEQ_INDEX,
- s->status, PNV_SPI_OPCODE_LO_NIBBLE(opcode));
+ seq_index = PNV_SPI_OPCODE_LO_NIBBLE(opcode);
s->loop_counter_2++;
} else {
/* Continue to next index if loop counter is reached */
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status,
+ SEQ_STATE_INDEX_INCREMENT);
}
break;
default:
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_EXECUTE);
/* Ignore unsupported operations. */
- next_sequencer_fsm(s);
+ seq_index++;
+ s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_INDEX_INCREMENT);
break;
} /* end of switch */
/*
@@ -965,10 +970,10 @@ static void operation_sequencer(PnvSpi *s)
* we need to go ahead and end things as if there was a STOP at the
* end.
*/
- if (get_seq_index(s) == NUM_SEQ_OPS) {
+ if (seq_index == NUM_SEQ_OPS) {
/* All 8 opcodes completed, sequencer idling */
s->status = SETFIELD(SPI_STS_SHIFTER_FSM, s->status, FSM_IDLE);
- s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status, 0);
+ seq_index = 0;
s->loop_counter_1 = 0;
s->loop_counter_2 = 0;
s->status = SETFIELD(SPI_STS_SEQ_FSM, s->status, SEQ_STATE_IDLE);
@@ -979,6 +984,8 @@ static void operation_sequencer(PnvSpi *s)
break;
}
} /* end of while */
+ /* Update sequencer index field in status.*/
+ s->status = SETFIELD(SPI_STS_SEQ_INDEX, s->status, seq_index);
return;
} /* end of operation_sequencer() */
generated by cgit v1.1 at 2025-03-25 03:26:30 +0000