* Copyright 2005 Stanislav Marek
* email:pisa@cmp.felk.cvut.cz
*
- * This software is released under the GPL-License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * any later version.
*/
#include <errno.h>
#include <getopt.h>
+#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/types.h>
+#include <linux/can/netlink.h>
/* seems not to be defined in errno.h */
#ifndef ENOTSUPP
#define ENOTSUPP 524 /* Operation is not supported */
#endif
-/* usefull defines */
+/* useful defines */
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#define do_div(a,b) a = (a) / (b)
typedef __u64 u64;
typedef __u32 u32;
+struct calc_bittiming_const {
+ struct can_bittiming_const bittiming_const;
-/*
- * CAN bit-timing parameters
- *
- * For futher information, please read chapter "8 BIT TIMING
- * REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
- * at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
- */
-struct can_bittiming {
- __u32 bitrate; /* Bit-rate in bits/second */
- __u32 sample_point; /* Sample point in one-tenth of a percent */
- __u32 tq; /* Time quanta (TQ) in nanoseconds */
- __u32 prop_seg; /* Propagation segment in TQs */
- __u32 phase_seg1; /* Phase buffer segment 1 in TQs */
- __u32 phase_seg2; /* Phase buffer segment 2 in TQs */
- __u32 sjw; /* Synchronisation jump width in TQs */
- __u32 brp; /* Bit-rate prescaler */
-};
-
-/*
- * CAN harware-dependent bit-timing constant
- *
- * Used for calculating and checking bit-timing parameters
- */
-struct can_bittiming_const {
- char name[16]; /* Name of the CAN controller hardware */
- __u32 tseg1_min; /* Time segement 1 = prop_seg + phase_seg1 */
- __u32 tseg1_max;
- __u32 tseg2_min; /* Time segement 2 = phase_seg2 */
- __u32 tseg2_max;
- __u32 sjw_max; /* Synchronisation jump width */
- __u32 brp_min; /* Bit-rate prescaler */
- __u32 brp_max;
- __u32 brp_inc;
-
- /* added for can-calc-bit-timing utility */
__u32 ref_clk; /* CAN system clock frequency in Hz */
- void (*printf_btr)(struct can_bittiming *bt, int hdr);
-};
-
-/*
- * CAN clock parameters
- */
-struct can_clock {
- __u32 freq; /* CAN system clock frequency in Hz */
+ void (*printf_btr)(struct can_bittiming *bt, bool hdr);
};
-
/*
* minimal structs, just enough to be source level compatible
*/
return (void *)&dev->priv;
}
-static void print_usage(char* cmd)
+static void print_usage(char *cmd)
{
printf("Usage: %s [options] [<CAN-contoller-name>]\n"
"\tOptions:\n"
exit(EXIT_FAILURE);
}
-static void printf_btr_sja1000(struct can_bittiming *bt, int hdr)
+static void printf_btr_sja1000(struct can_bittiming *bt, bool hdr)
{
uint8_t btr0, btr1;
}
}
-static void printf_btr_at91(struct can_bittiming *bt, int hdr)
+static void printf_btr_at91(struct can_bittiming *bt, bool hdr)
{
if (hdr) {
printf("%10s", "CAN_BR");
}
}
-static void printf_btr_flexcan(struct can_bittiming *bt, int hdr)
+static void printf_btr_flexcan(struct can_bittiming *bt, bool hdr)
{
if (hdr) {
printf("%10s", "CAN_CTRL");
}
}
-static void printf_btr_mcp251x(struct can_bittiming *bt, int hdr)
+static void printf_btr_mcp251x(struct can_bittiming *bt, bool hdr)
{
uint8_t cnf1, cnf2, cnf3;
if (hdr) {
printf("CNF1 CNF2 CNF3");
} else {
- cnf1 = ((bt->sjw - 1) << 6) | bt->brp;
+ cnf1 = ((bt->sjw - 1) << 6) | (bt->brp - 1);
cnf2 = 0x80 | ((bt->phase_seg1 - 1) << 3) | (bt->prop_seg - 1);
cnf3 = bt->phase_seg2 - 1;
printf("0x%02x 0x%02x 0x%02x", cnf1, cnf2, cnf3);
}
}
-static struct can_bittiming_const can_calc_consts[] = {
- {
- .name = "sja1000",
- .tseg1_min = 1,
- .tseg1_max = 16,
- .tseg2_min = 1,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
+static void printf_btr_ti_hecc(struct can_bittiming *bt, bool hdr)
+{
+ if (hdr) {
+ printf("%10s", "CANBTC");
+ } else {
+ uint32_t can_btc;
+
+ can_btc = (bt->phase_seg2 - 1) & 0x7;
+ can_btc |= ((bt->phase_seg1 + bt->prop_seg - 1)
+ & 0xF) << 3;
+ can_btc |= ((bt->sjw - 1) & 0x3) << 8;
+ can_btc |= ((bt->brp - 1) & 0xFF) << 16;
+ printf("0x%08x", can_btc);
+ }
+}
+
+#define RCAR_CAN_BCR_TSEG1(x) (((x) & 0x0f) << 20)
+#define RCAR_CAN_BCR_BPR(x) (((x) & 0x3ff) << 8)
+#define RCAR_CAN_BCR_SJW(x) (((x) & 0x3) << 4)
+#define RCAR_CAN_BCR_TSEG2(x) ((x) & 0x07)
+
+static void printf_btr_rcar_can(struct can_bittiming *bt, bool hdr)
+{
+ if (hdr) {
+ printf("%10s", "CiBCR");
+ } else {
+ uint32_t bcr;
+
+ bcr = RCAR_CAN_BCR_TSEG1(bt->phase_seg1 + bt->prop_seg - 1) |
+ RCAR_CAN_BCR_BPR(bt->brp - 1) |
+ RCAR_CAN_BCR_SJW(bt->sjw - 1) |
+ RCAR_CAN_BCR_TSEG2(bt->phase_seg2 - 1);
+
+ printf("0x%08x", bcr << 8);
+ }
+}
+
+static struct calc_bittiming_const can_calc_consts[] = {
+ {
+ .bittiming_const = {
+ .name = "sja1000",
+ .tseg1_min = 1,
+ .tseg1_max = 16,
+ .tseg2_min = 1,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 8000000,
.printf_btr = printf_btr_sja1000,
- },
- {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 32000000,
.printf_btr = printf_btr_sja1000,
- },
- {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 33000000,
.printf_btr = printf_btr_sja1000,
- },
- {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 33300000,
.printf_btr = printf_btr_sja1000,
- },
- {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 33333333,
.printf_btr = printf_btr_sja1000,
- },
- {
- .name = "at91",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 2,
- .brp_max = 128,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
+ .ref_clk = 66660000, /* mpc5121 */
+ .printf_btr = printf_btr_sja1000,
+ }, {
+ .bittiming_const = {
+ .name = "mscan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
+ .ref_clk = 66666666, /* mpc5121 */
+ .printf_btr = printf_btr_sja1000,
+ }, {
+ .bittiming_const = {
+ .name = "at91",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 2,
+ .brp_max = 128,
+ .brp_inc = 1,
+ },
.ref_clk = 100000000,
.printf_btr = printf_btr_at91,
- },
- {
- .name = "at91",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 2,
- .brp_max = 128,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "at91",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 2,
+ .brp_max = 128,
+ .brp_inc = 1,
+ },
/* real world clock as found on the ronetix PM9263 */
.ref_clk = 99532800,
.printf_btr = printf_btr_at91,
- },
- {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
.ref_clk = 24000000, /* mx28 */
.printf_btr = printf_btr_flexcan,
- },
- {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
+ .ref_clk = 30000000, /* mx6 */
+ .printf_btr = printf_btr_flexcan,
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
.ref_clk = 49875000,
.printf_btr = printf_btr_flexcan,
- },
- {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
.ref_clk = 66000000,
.printf_btr = printf_btr_flexcan,
- },
- {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
.ref_clk = 66500000,
.printf_btr = printf_btr_flexcan,
- },
- {
- .name = "mcp251x",
- .tseg1_min = 3,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
+ .ref_clk = 66666666,
+ .printf_btr = printf_btr_flexcan,
+ }, {
+ .bittiming_const = {
+ .name = "flexcan",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
+ .ref_clk = 83368421,
+ .printf_btr = printf_btr_flexcan, /* vybrid */
+ }, {
+ .bittiming_const = {
+ .name = "mcp251x",
+ .tseg1_min = 3,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 8000000,
.printf_btr = printf_btr_mcp251x,
- },
- {
- .name = "mcp251x",
- .tseg1_min = 3,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-
+ }, {
+ .bittiming_const = {
+ .name = "mcp251x",
+ .tseg1_min = 3,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
.ref_clk = 16000000,
.printf_btr = printf_btr_mcp251x,
+ }, {
+ .bittiming_const = {
+ .name = "ti_hecc",
+ .tseg1_min = 1,
+ .tseg1_max = 16,
+ .tseg2_min = 1,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 256,
+ .brp_inc = 1,
+ },
+ .ref_clk = 13000000,
+ .printf_btr = printf_btr_ti_hecc,
+ }, {
+ .bittiming_const = {
+ .name = "rcar_can",
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 1024,
+ .brp_inc = 1,
+ },
+ .ref_clk = 65000000,
+ .printf_btr = printf_btr_rcar_can,
},
};
return sampl_pt;
}
-static void print_bit_timing(const struct can_bittiming_const *btc,
+static void print_bit_timing(const struct calc_bittiming_const *btc,
__u32 bitrate, __u32 sample_point, __u32 ref_clk,
- int quiet)
+ bool quiet)
{
struct net_device dev = {
- .priv.bittiming_const = btc,
+ .priv.bittiming_const = &btc->bittiming_const,
.priv.clock.freq = ref_clk,
};
struct can_bittiming bt = {
printf("Bit timing parameters for %s with %.6f MHz ref clock\n"
"nominal real Bitrt nom real SampP\n"
"Bitrate TQ[ns] PrS PhS1 PhS2 SJW BRP Bitrate Error SampP SampP Error ",
- btc->name,
+ btc->bittiming_const.name,
ref_clk / 1000000.0);
- btc->printf_btr(&bt, 1);
+ btc->printf_btr(&bt, true);
printf("\n");
}
bt.sample_point / 10.0,
100.0 * spt_error / sample_point);
- btc->printf_btr(&bt, 0);
+ btc->printf_btr(&bt, false);
printf("\n");
}
unsigned int i;
for (i = 0; i < ARRAY_SIZE(can_calc_consts); i++)
- printf("%s\n", can_calc_consts[i].name);
+ printf("%s\n", can_calc_consts[i].bittiming_const.name);
}
int main(int argc, char *argv[])
__u32 bitrate = 0;
__u32 opt_ref_clk = 0, ref_clk;
int sampl_pt = 0;
- int quiet = 0;
- int list = 0;
+ bool quiet = false, list = false, found = false;
char *name = NULL;
unsigned int i, j;
- int opt, found = 0;
+ int opt;
- const struct can_bittiming_const *btc = NULL;
+ const struct calc_bittiming_const *btc = NULL;
while ((opt = getopt(argc, argv, "b:c:lps:")) != -1) {
switch (opt) {
break;
case 'l':
- list = 1;
+ list = true;
break;
case 'q':
- quiet = 1;
+ quiet = true;
break;
case 's':
print_usage(argv[0]);
for (i = 0; i < ARRAY_SIZE(can_calc_consts); i++) {
- if (name && strcmp(can_calc_consts[i].name, name))
+ if (name && strcmp(can_calc_consts[i].bittiming_const.name, name))
continue;
- found = 1;
+ found = true;
btc = &can_calc_consts[i];
if (opt_ref_clk)
projects / can-utils.git / blobdiff