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Date: Tue, 17 Nov 2020 11:05:59 -0500
From: <min.li.xe@...esas.com>
To: <richardcochran@...il.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Min Li <min.li.xe@...esas.com>
Subject: [PATCH v2 net-next 2/5] ptp: clockmatrix: reset device and check BOOT_STATUS
From: Min Li <min.li.xe@...esas.com>
SM_RESET device only when loading full configuration and check
for BOOT_STATUS. Also remove polling for write trigger done in
_idtcm_settime().
Signed-off-by: Min Li <min.li.xe@...esas.com>
---
drivers/ptp/idt8a340_reg.h | 1 +
drivers/ptp/ptp_clockmatrix.c | 152 ++++++++++++++++++++++++++++++++----------
drivers/ptp/ptp_clockmatrix.h | 9 ++-
3 files changed, 126 insertions(+), 36 deletions(-)
diff --git a/drivers/ptp/idt8a340_reg.h b/drivers/ptp/idt8a340_reg.h
index b297c4a..a664dfe 100644
--- a/drivers/ptp/idt8a340_reg.h
+++ b/drivers/ptp/idt8a340_reg.h
@@ -103,6 +103,7 @@
#define SM_RESET_CMD 0x5A
#define GENERAL_STATUS 0xc014
+#define BOOT_STATUS 0x0000
#define HW_REV_ID 0x000A
#define BOND_ID 0x000B
#define HW_CSR_ID 0x000C
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index efe5639..6a3d02b 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -33,6 +33,45 @@ module_param(firmware, charp, 0);
#define SETTIME_CORRECTION (0)
+static int contains_full_configuration(const struct firmware *fw)
+{
+ s32 full_count = FULL_FW_CFG_BYTES - FULL_FW_CFG_SKIPPED_BYTES;
+ struct idtcm_fwrc *rec = (struct idtcm_fwrc *) fw->data;
+ s32 count = 0;
+ u16 regaddr;
+ u8 loaddr;
+ s32 len;
+
+ /* If the firmware contains 'full configuration' SM_RESET can be used
+ * to ensure proper configuration.
+ *
+ * Full configuration is defined as the number of programmable
+ * bytes within the configuration range minus page offset addr range.
+ */
+ for (len = fw->size; len > 0; len -= sizeof(*rec)) {
+ regaddr = rec->hiaddr << 8;
+ regaddr |= rec->loaddr;
+
+ loaddr = rec->loaddr;
+
+ rec++;
+
+ /* Top (status registers) and bottom are read-only */
+ if ((regaddr < GPIO_USER_CONTROL)
+ || (regaddr >= SCRATCH))
+ continue;
+
+ /* Page size 128, last 4 bytes of page skipped */
+ if (((loaddr > 0x7b) && (loaddr <= 0x7f))
+ || loaddr > 0xfb)
+ continue;
+
+ count++;
+ }
+
+ return (count >= full_count);
+}
+
static long set_write_phase_ready(struct ptp_clock_info *ptp)
{
struct idtcm_channel *channel =
@@ -302,6 +341,53 @@ static int idtcm_write(struct idtcm *idtcm,
return _idtcm_rdwr(idtcm, module + regaddr, buf, count, true);
}
+static int clear_boot_status(struct idtcm *idtcm)
+{
+ int err;
+ u8 buf[4] = {0};
+
+ err = idtcm_write(idtcm, GENERAL_STATUS, BOOT_STATUS, buf, sizeof(buf));
+
+ return err;
+}
+
+static int read_boot_status(struct idtcm *idtcm, u32 *status)
+{
+ int err;
+ u8 buf[4] = {0};
+
+ err = idtcm_read(idtcm, GENERAL_STATUS, BOOT_STATUS, buf, sizeof(buf));
+
+ *status = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+
+ return err;
+}
+
+static int wait_for_boot_status_ready(struct idtcm *idtcm)
+{
+ u32 status = 0;
+ u8 i = 30; /* 30 * 100ms = 3s */
+ int err;
+
+ do {
+ err = read_boot_status(idtcm, &status);
+
+ if (err)
+ return err;
+
+ if (status == 0xA0)
+ return 0;
+
+ msleep(100);
+ i--;
+
+ } while (i);
+
+ dev_warn(&idtcm->client->dev, "%s timed out\n", __func__);
+
+ return -EBUSY;
+}
+
static int _idtcm_gettime(struct idtcm_channel *channel,
struct timespec64 *ts)
{
@@ -711,7 +797,7 @@ static int _idtcm_set_dpll_scsr_tod(struct idtcm_channel *channel,
if (err)
return err;
- if (cmd == 0)
+ if ((cmd & TOD_WRITE_SELECTION_MASK) == 0)
break;
if (++count > 20) {
@@ -725,39 +811,16 @@ static int _idtcm_set_dpll_scsr_tod(struct idtcm_channel *channel,
}
static int _idtcm_settime(struct idtcm_channel *channel,
- struct timespec64 const *ts,
- enum hw_tod_write_trig_sel wr_trig)
+ struct timespec64 const *ts)
{
struct idtcm *idtcm = channel->idtcm;
int err;
- int i;
- u8 trig_sel;
-
- err = _idtcm_set_dpll_hw_tod(channel, ts, wr_trig);
-
- if (err)
- return err;
-
- /* Wait for the operation to complete. */
- for (i = 0; i < 10000; i++) {
- err = idtcm_read(idtcm, channel->hw_dpll_n,
- HW_DPLL_TOD_CTRL_1, &trig_sel,
- sizeof(trig_sel));
-
- if (err)
- return err;
- if (trig_sel == 0x4a)
- break;
-
- err = 1;
- }
+ err = _idtcm_set_dpll_hw_tod(channel, ts, HW_TOD_WR_TRIG_SEL_MSB);
if (err) {
dev_err(&idtcm->client->dev,
- "Failed at line %d in func %s!\n",
- __LINE__,
- __func__);
+ "%s: Set HW ToD failed\n", __func__);
return err;
}
@@ -932,7 +995,7 @@ static int _idtcm_adjtime(struct idtcm_channel *channel, s64 delta)
ts = ns_to_timespec64(now);
- err = _idtcm_settime(channel, &ts, HW_TOD_WR_TRIG_SEL_MSB);
+ err = _idtcm_settime(channel, &ts);
}
return err;
@@ -940,13 +1003,31 @@ static int _idtcm_adjtime(struct idtcm_channel *channel, s64 delta)
static int idtcm_state_machine_reset(struct idtcm *idtcm)
{
- int err;
u8 byte = SM_RESET_CMD;
+ u32 status = 0;
+ int err;
+ u8 i;
+
+ clear_boot_status(idtcm);
err = idtcm_write(idtcm, RESET_CTRL, SM_RESET, &byte, sizeof(byte));
- if (!err)
- msleep_interruptible(POST_SM_RESET_DELAY_MS);
+ if (!err) {
+ for (i = 0; i < 30; i++) {
+ msleep_interruptible(100);
+ read_boot_status(idtcm, &status);
+
+ if (status == 0xA0) {
+ dev_dbg(&idtcm->client->dev,
+ "SM_RESET completed in %d ms\n",
+ i * 100);
+ break;
+ }
+ }
+
+ if (!status)
+ dev_err(&idtcm->client->dev, "Timed out waiting for CM_RESET to complete\n");
+ }
return err;
}
@@ -1140,7 +1221,7 @@ static int idtcm_load_firmware(struct idtcm *idtcm,
rec = (struct idtcm_fwrc *) fw->data;
- if (fw->size > 0)
+ if (contains_full_configuration(fw))
idtcm_state_machine_reset(idtcm);
for (len = fw->size; len > 0; len -= sizeof(*rec)) {
@@ -1420,7 +1501,7 @@ static int idtcm_settime(struct ptp_clock_info *ptp,
mutex_lock(&idtcm->reg_lock);
- err = _idtcm_settime(channel, ts, HW_TOD_WR_TRIG_SEL_MSB);
+ err = _idtcm_settime(channel, ts);
if (err)
dev_err(&idtcm->client->dev,
@@ -1851,7 +1932,7 @@ static int idtcm_enable_tod(struct idtcm_channel *channel)
if (err)
return err;
- return _idtcm_settime(channel, &ts, HW_TOD_WR_TRIG_SEL_MSB);
+ return _idtcm_settime(channel, &ts);
}
static void idtcm_display_version_info(struct idtcm *idtcm)
@@ -2143,6 +2224,9 @@ static int idtcm_probe(struct i2c_client *client,
dev_warn(&idtcm->client->dev,
"loading firmware failed with %d\n", err);
+ if (wait_for_boot_status_ready(idtcm))
+ dev_warn(&idtcm->client->dev, "BOOT_STATUS != 0xA0\n");
+
if (idtcm->tod_mask) {
for (i = 0; i < MAX_TOD; i++) {
if (idtcm->tod_mask & (1 << i)) {
diff --git a/drivers/ptp/ptp_clockmatrix.h b/drivers/ptp/ptp_clockmatrix.h
index 82840d7..713e41a 100644
--- a/drivers/ptp/ptp_clockmatrix.h
+++ b/drivers/ptp/ptp_clockmatrix.h
@@ -53,9 +53,14 @@
#define OUTPUT_MODULE_FROM_INDEX(index) (OUTPUT_0 + (index) * 0x10)
-#define PEROUT_ENABLE_OUTPUT_MASK (0xdeadbeef)
+#define PEROUT_ENABLE_OUTPUT_MASK (0xdeadbeef)
-#define IDTCM_MAX_WRITE_COUNT (512)
+#define IDTCM_MAX_WRITE_COUNT (512)
+
+#define FULL_FW_CFG_BYTES (SCRATCH - GPIO_USER_CONTROL)
+#define FULL_FW_CFG_SKIPPED_BYTES (((SCRATCH >> 7) \
+ - (GPIO_USER_CONTROL >> 7)) \
+ * 4) /* 4 bytes skipped every 0x80 */
/* Values of DPLL_N.DPLL_MODE.PLL_MODE */
enum pll_mode {
--
2.7.4
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