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authorMarek Vasut <marex@denx.de>2016-05-08 00:34:12 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2016-05-09 11:07:28 +0200
commitbe1861320a9ec599b6862ebb71db9bd3ad897150 (patch)
treebeffcb3f9cb39d4c95999f1c5dd3af689ed9393f /drivers/net/can/ifi_canfd
parentcan: ifi: Start NAPI poll on bus warning too (diff)
downloadlinux-be1861320a9ec599b6862ebb71db9bd3ad897150.tar.xz
linux-be1861320a9ec599b6862ebb71db9bd3ad897150.zip
can: ifi: Update timing configuration code
The updated documentation regarding the IFI CANFD core from April 2016 adds more details regarding the timing calculation. There is no longer any distinction in the timing calculation between CANFD and CAN2.0, but instead there are two timing modes -- 4_12_6_6 and 7_9_8_8 -- where the numbers mean the width in bits of the SJW/Prescaler/TimeA/TimeB fields. The code uses 7_9_8_8 mode, which allows more fine-grained control over the timing. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Marc Kleine-Budde <mkl@pengutronix.de> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Oliver Hartkopp <socketcan@hartkopp.net> Cc: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/ifi_canfd')
-rw-r--r--drivers/net/can/ifi_canfd/ifi_canfd.c54
1 files changed, 21 insertions, 33 deletions
diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 1ad05f1ab942..b9efd6ec04c9 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -34,6 +34,7 @@
#define IFI_CANFD_STCMD_LOOPBACK BIT(18)
#define IFI_CANFD_STCMD_DISABLE_CANFD BIT(24)
#define IFI_CANFD_STCMD_ENABLE_ISO BIT(25)
+#define IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING BIT(26)
#define IFI_CANFD_STCMD_NORMAL_MODE ((u32)BIT(31))
#define IFI_CANFD_RXSTCMD 0x4
@@ -71,12 +72,12 @@
#define IFI_CANFD_TIME_TIMEB_OFF 0
#define IFI_CANFD_TIME_TIMEA_OFF 8
#define IFI_CANFD_TIME_PRESCALE_OFF 16
-#define IFI_CANFD_TIME_SJW_OFF_ISO 25
-#define IFI_CANFD_TIME_SJW_OFF_BOSCH 28
-#define IFI_CANFD_TIME_SET_SJW_BOSCH BIT(6)
-#define IFI_CANFD_TIME_SET_TIMEB_BOSCH BIT(7)
-#define IFI_CANFD_TIME_SET_PRESC_BOSCH BIT(14)
-#define IFI_CANFD_TIME_SET_TIMEA_BOSCH BIT(15)
+#define IFI_CANFD_TIME_SJW_OFF_7_9_8_8 25
+#define IFI_CANFD_TIME_SJW_OFF_4_12_6_6 28
+#define IFI_CANFD_TIME_SET_SJW_4_12_6_6 BIT(6)
+#define IFI_CANFD_TIME_SET_TIMEB_4_12_6_6 BIT(7)
+#define IFI_CANFD_TIME_SET_PRESC_4_12_6_6 BIT(14)
+#define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6 BIT(15)
#define IFI_CANFD_TDELAY 0x1c
@@ -534,24 +535,24 @@ static irqreturn_t ifi_canfd_isr(int irq, void *dev_id)
static const struct can_bittiming_const ifi_canfd_bittiming_const = {
.name = KBUILD_MODNAME,
.tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */
- .tseg1_max = 64,
+ .tseg1_max = 256,
.tseg2_min = 2, /* Time segment 2 = phase_seg2 */
- .tseg2_max = 64,
- .sjw_max = 16,
+ .tseg2_max = 256,
+ .sjw_max = 128,
.brp_min = 2,
- .brp_max = 256,
+ .brp_max = 512,
.brp_inc = 1,
};
static const struct can_bittiming_const ifi_canfd_data_bittiming_const = {
.name = KBUILD_MODNAME,
.tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */
- .tseg1_max = 64,
+ .tseg1_max = 256,
.tseg2_min = 2, /* Time segment 2 = phase_seg2 */
- .tseg2_max = 64,
- .sjw_max = 16,
+ .tseg2_max = 256,
+ .sjw_max = 128,
.brp_min = 2,
- .brp_max = 256,
+ .brp_max = 512,
.brp_inc = 1,
};
@@ -561,19 +562,6 @@ static void ifi_canfd_set_bittiming(struct net_device *ndev)
const struct can_bittiming *bt = &priv->can.bittiming;
const struct can_bittiming *dbt = &priv->can.data_bittiming;
u16 brp, sjw, tseg1, tseg2;
- u32 noniso_arg = 0;
- u32 time_off;
-
- if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
- !(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)) {
- time_off = IFI_CANFD_TIME_SJW_OFF_ISO;
- } else {
- noniso_arg = IFI_CANFD_TIME_SET_TIMEB_BOSCH |
- IFI_CANFD_TIME_SET_TIMEA_BOSCH |
- IFI_CANFD_TIME_SET_PRESC_BOSCH |
- IFI_CANFD_TIME_SET_SJW_BOSCH;
- time_off = IFI_CANFD_TIME_SJW_OFF_BOSCH;
- }
/* Configure bit timing */
brp = bt->brp - 2;
@@ -583,8 +571,7 @@ static void ifi_canfd_set_bittiming(struct net_device *ndev)
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
(brp << IFI_CANFD_TIME_PRESCALE_OFF) |
- (sjw << time_off) |
- noniso_arg,
+ (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
priv->base + IFI_CANFD_TIME);
/* Configure data bit timing */
@@ -595,8 +582,7 @@ static void ifi_canfd_set_bittiming(struct net_device *ndev)
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
(brp << IFI_CANFD_TIME_PRESCALE_OFF) |
- (sjw << time_off) |
- noniso_arg,
+ (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
priv->base + IFI_CANFD_FTIME);
}
@@ -641,7 +627,8 @@ static void ifi_canfd_start(struct net_device *ndev)
/* Reset the IP */
writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
- writel(0, priv->base + IFI_CANFD_STCMD);
+ writel(IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING,
+ priv->base + IFI_CANFD_STCMD);
ifi_canfd_set_bittiming(ndev);
ifi_canfd_set_filters(ndev);
@@ -660,7 +647,8 @@ static void ifi_canfd_start(struct net_device *ndev)
writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
priv->base + IFI_CANFD_INTERRUPT);
- stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE;
+ stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE |
+ IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING;
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
stcmd |= IFI_CANFD_STCMD_BUSMONITOR;