[PATCH net-next V1 5/5] net: lan743x: Add support for PTP-IO Event Output (Periodic Output)

Raju Lakkaraju
2022-03-17T10:43:52Z

Add support for PTP-IO Event Output (Periodic Output - perout) for
PCI11010/PCI11414 chips

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
---
Change List:
V0 -> V1:
1. Fix the checkpatch warnings

drivers/net/ethernet/microchip/lan743x_main.h | 33 +++
drivers/net/ethernet/microchip/lan743x_ptp.c | 218 +++++++++++++++++-
drivers/net/ethernet/microchip/lan743x_ptp.h | 1 +
3 files changed, 250 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index 9c528705866f..1ca5f3216403 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -336,6 +336,7 @@
#define INT_MOD_CFG9 (0x7E4)

#define PTP_CMD_CTL (0x0A00)
+#define PTP_CMD_CTL_PTP_LTC_TARGET_READ_ BIT(13)
#define PTP_CMD_CTL_PTP_CLK_STP_NSEC_ BIT(6)
#define PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_ BIT(5)
#define PTP_CMD_CTL_PTP_CLOCK_LOAD_ BIT(4)
@@ -357,6 +358,30 @@
(((value) & 0x7) << (1 + ((channel) << 2)))
#define PTP_GENERAL_CONFIG_RELOAD_ADD_X_(channel) (BIT((channel) << 2))

+#define HS_PTP_GENERAL_CONFIG (0x0A04)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_(channel) \
+ (0xf << (4 + ((channel) << 2)))
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_ (0)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500NS_ (1)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1US_ (2)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5US_ (3)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_ (4)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50US_ (5)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_ (6)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500US_ (7)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_ (8)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5MS_ (9)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_ (10)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50MS_ (11)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100MS_ (12)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_ (13)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_TOGG_ (14)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_INT_ (15)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_(channel, value) \
+ (((value) & 0xf) << (4 + ((channel) << 2)))
+#define HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(channel) (BIT(1 + ((channel) * 2)))
+#define HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(channel) (BIT((channel) * 2))
+
#define PTP_INT_STS (0x0A08)
#define PTP_INT_IO_FE_MASK_ GENMASK(31, 24)
#define PTP_INT_IO_FE_SHIFT_ (24)
@@ -364,9 +389,17 @@
#define PTP_INT_IO_RE_MASK_ GENMASK(23, 16)
#define PTP_INT_IO_RE_SHIFT_ (16)
#define PTP_INT_IO_RE_SET_(channel) BIT(16 + (channel))
+#define PTP_INT_TX_TS_OVRFL_INT_ BIT(14)
+#define PTP_INT_TX_SWTS_ERR_INT_ BIT(13)
+#define PTP_INT_TX_TS_INT_ BIT(12)
+#define PTP_INT_RX_TS_OVRFL_INT_ BIT(9)
+#define PTP_INT_RX_TS_INT_ BIT(8)
+#define PTP_INT_TIMER_INT_B_ BIT(1)
+#define PTP_INT_TIMER_INT_A_ BIT(0)
#define PTP_INT_EN_SET (0x0A0C)
#define PTP_INT_EN_FE_EN_SET_(channel) BIT(24 + (channel))
#define PTP_INT_EN_RE_EN_SET_(channel) BIT(16 + (channel))
+#define PTP_INT_EN_TIMER_SET_(channel) BIT(channel)
#define PTP_INT_EN_CLR (0x0A10)
#define PTP_INT_EN_FE_EN_CLR_(channel) BIT(24 + (channel))
#define PTP_INT_EN_RE_EN_CLR_(channel) BIT(16 + (channel))
diff --git a/drivers/net/ethernet/microchip/lan743x_ptp.c b/drivers/net/ethernet/microchip/lan743x_ptp.c
index 470d9050df0c..6a11e2ceb013 100644
--- a/drivers/net/ethernet/microchip/lan743x_ptp.c
+++ b/drivers/net/ethernet/microchip/lan743x_ptp.c
@@ -689,6 +689,215 @@ static int lan743x_ptp_perout(struct lan743x_adapter *adapter, int on,
return ret;
}

+static void lan743x_ptp_io_perout_off(struct lan743x_adapter *adapter,
+ u32 index)
+{
+ struct lan743x_ptp *ptp = &adapter->ptp;
+ int perout_pin;
+ int event_ch;
+ u32 gen_cfg;
+ int val;
+
+ event_ch = ptp->ptp_io_perout[index];
+ if (event_ch >= 0) {
+ /* set target to far in the future, effectively disabling it */
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_SEC_X(event_ch),
+ 0xFFFF0000);
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_NS_X(event_ch),
+ 0);
+
+ gen_cfg = lan743x_csr_read(adapter, HS_PTP_GENERAL_CONFIG);
+ gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_
+ (event_ch));
+ gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(event_ch));
+ gen_cfg |= HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(event_ch);
+ lan743x_csr_write(adapter, HS_PTP_GENERAL_CONFIG, gen_cfg);
+ if (event_ch)
+ lan743x_csr_write(adapter, PTP_INT_STS,
+ PTP_INT_TIMER_INT_B_);
+ else
+ lan743x_csr_write(adapter, PTP_INT_STS,
+ PTP_INT_TIMER_INT_A_);
+ lan743x_ptp_release_event_ch(adapter, event_ch);
+ ptp->ptp_io_perout[index] = -1;
+ }
+
+ perout_pin = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT, index);
+
+ /* Deselect Event output */
+ val = lan743x_csr_read(adapter, PTP_IO_EVENT_OUTPUT_CFG);
+
+ /* Disables the output of Local Time Target compare events */
+ val &= ~PTP_IO_EVENT_OUTPUT_CFG_EN_(perout_pin);
+ lan743x_csr_write(adapter, PTP_IO_EVENT_OUTPUT_CFG, val);
+
+ /* Configured as an opendrain driver*/
+ val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+ val &= ~PTP_IO_PIN_CFG_OBUF_TYPE_(perout_pin);
+ lan743x_csr_write(adapter, PTP_IO_PIN_CFG, val);
+ /* Dummy read to make sure write operation success */
+ val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+}
+
+static int lan743x_ptp_io_perout(struct lan743x_adapter *adapter, int on,
+ struct ptp_perout_request *perout_request)
+{
+ struct lan743x_ptp *ptp = &adapter->ptp;
+ u32 period_sec, period_nsec;
+ u32 start_sec, start_nsec;
+ u32 pulse_sec, pulse_nsec;
+ int pulse_width;
+ int perout_pin;
+ int event_ch;
+ u32 gen_cfg;
+ u32 index;
+ int val;
+
+ index = perout_request->index;
+ event_ch = ptp->ptp_io_perout[index];
+
+ if (on) {
+ perout_pin = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT, index);
+ if (perout_pin < 0)
+ return -EBUSY;
+ } else {
+ lan743x_ptp_io_perout_off(adapter, index);
+ return 0;
+ }
+
+ if (event_ch >= LAN743X_PTP_N_EVENT_CHAN) {
+ /* already on, turn off first */
+ lan743x_ptp_io_perout_off(adapter, index);
+ }
+
+ event_ch = lan743x_ptp_reserve_event_ch(adapter, index);
+ if (event_ch < 0) {
+ netif_warn(adapter, drv, adapter->netdev,
+ "Failed to reserve event channel %d for PEROUT\n",
+ index);
+ goto failed;
+ }
+ ptp->ptp_io_perout[index] = event_ch;
+
+ if (perout_request->flags & PTP_PEROUT_DUTY_CYCLE) {
+ pulse_sec = perout_request->on.sec;
+ pulse_sec += perout_request->on.nsec / 1000000000;
+ pulse_nsec = perout_request->on.nsec % 1000000000;
+ } else {
+ pulse_sec = perout_request->period.sec;
+ pulse_sec += perout_request->period.nsec / 1000000000;
+ pulse_nsec = perout_request->period.nsec % 1000000000;
+ }
+
+ if (pulse_sec == 0) {
+ if (pulse_nsec >= 400000000) {
+ pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
+ } else if (pulse_nsec >= 200000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100MS_;
+ } else if (pulse_nsec >= 100000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50MS_;
+ } else if (pulse_nsec >= 20000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_;
+ } else if (pulse_nsec >= 10000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5MS_;
+ } else if (pulse_nsec >= 2000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_;
+ } else if (pulse_nsec >= 1000000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500US_;
+ } else if (pulse_nsec >= 200000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_;
+ } else if (pulse_nsec >= 100000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50US_;
+ } else if (pulse_nsec >= 20000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_;
+ } else if (pulse_nsec >= 10000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5US_;
+ } else if (pulse_nsec >= 2000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1US_;
+ } else if (pulse_nsec >= 1000) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500NS_;
+ } else if (pulse_nsec >= 200) {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_;
+ } else {
+ netif_warn(adapter, drv, adapter->netdev,
+ "perout period too small, min is 200nS\n");
+ goto failed;
+ }
+ } else {
+ pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
+ }
+
+ /* turn off by setting target far in future */
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_SEC_X(event_ch),
+ 0xFFFF0000);
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_NS_X(event_ch), 0);
+
+ /* Configure to pulse every period */
+ gen_cfg = lan743x_csr_read(adapter, HS_PTP_GENERAL_CONFIG);
+ gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_(event_ch));
+ gen_cfg |= HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_
+ (event_ch, pulse_width);
+ gen_cfg |= HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(event_ch);
+ gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(event_ch));
+ lan743x_csr_write(adapter, HS_PTP_GENERAL_CONFIG, gen_cfg);
+
+ /* set the reload to one toggle cycle */
+ period_sec = perout_request->period.sec;
+ period_sec += perout_request->period.nsec / 1000000000;
+ period_nsec = perout_request->period.nsec % 1000000000;
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_RELOAD_SEC_X(event_ch),
+ period_sec);
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_RELOAD_NS_X(event_ch),
+ period_nsec);
+
+ start_sec = perout_request->start.sec;
+ start_sec += perout_request->start.nsec / 1000000000;
+ start_nsec = perout_request->start.nsec % 1000000000;
+
+ /* set the start time */
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_SEC_X(event_ch),
+ start_sec);
+ lan743x_csr_write(adapter,
+ PTP_CLOCK_TARGET_NS_X(event_ch),
+ start_nsec);
+
+ /* Enable LTC Target Read */
+ val = lan743x_csr_read(adapter, PTP_CMD_CTL);
+ val |= PTP_CMD_CTL_PTP_LTC_TARGET_READ_;
+ lan743x_csr_write(adapter, PTP_CMD_CTL, val);
+
+ /* Configure as an push/pull driver */
+ val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+ val |= PTP_IO_PIN_CFG_OBUF_TYPE_(perout_pin);
+ lan743x_csr_write(adapter, PTP_IO_PIN_CFG, val);
+
+ /* Select Event output */
+ val = lan743x_csr_read(adapter, PTP_IO_EVENT_OUTPUT_CFG);
+ if (event_ch)
+ /* Channel B as the output */
+ val |= PTP_IO_EVENT_OUTPUT_CFG_SEL_(perout_pin);
+ else
+ /* Channel A as the output */
+ val &= ~PTP_IO_EVENT_OUTPUT_CFG_SEL_(perout_pin);
+
+ /* Enables the output of Local Time Target compare events */
+ val |= PTP_IO_EVENT_OUTPUT_CFG_EN_(perout_pin);
+ lan743x_csr_write(adapter, PTP_IO_EVENT_OUTPUT_CFG, val);
+
+ return 0;
+
+failed:
+ lan743x_ptp_io_perout_off(adapter, index);
+ return -ENODEV;
+}
+
static void lan743x_ptp_io_extts_off(struct lan743x_adapter *adapter,
u32 index)
{
@@ -812,9 +1021,14 @@ static int lan743x_ptpci_enable(struct ptp_clock_info *ptpci,
&request->extts);
return -EINVAL;
case PTP_CLK_REQ_PEROUT:
- if (request->perout.index < ptpci->n_per_out)
- return lan743x_ptp_perout(adapter, on,
+ if (request->perout.index < ptpci->n_per_out) {
+ if (adapter->is_pci11x1x)
+ return lan743x_ptp_io_perout(adapter, on,
+ &request->perout);
+ else
+ return lan743x_ptp_perout(adapter, on,
&request->perout);
+ }
return -EINVAL;
case PTP_CLK_REQ_PPS:
return -EINVAL;
diff --git a/drivers/net/ethernet/microchip/lan743x_ptp.h b/drivers/net/ethernet/microchip/lan743x_ptp.h
index 96d3a134e788..e26d4eff7133 100644
--- a/drivers/net/ethernet/microchip/lan743x_ptp.h
+++ b/drivers/net/ethernet/microchip/lan743x_ptp.h
@@ -80,6 +80,7 @@ struct lan743x_ptp {

unsigned long used_event_ch;
struct lan743x_ptp_perout perout[LAN743X_PTP_N_PEROUT];
+ int ptp_io_perout[LAN743X_PTP_N_PEROUT]; /* PTP event channel (0=channel A, 1=channel B) */
struct lan743x_extts extts[LAN743X_PTP_N_EXTTS];

bool leds_multiplexed;
--
2.25.1