diff options
Diffstat (limited to 'drivers/net/can/flexcan')
| -rw-r--r-- | drivers/net/can/flexcan/Makefile | 3 | ||||
| -rw-r--r-- | drivers/net/can/flexcan/dev.c | 743 | ||||
| -rw-r--r-- | drivers/net/can/flexcan/drv.c | 628 | ||||
| -rw-r--r-- | drivers/net/can/flexcan/flexcan.h | 222 | ||||
| -rw-r--r-- | drivers/net/can/flexcan/mbm.c | 361 |
5 files changed, 1957 insertions, 0 deletions
diff --git a/drivers/net/can/flexcan/Makefile b/drivers/net/can/flexcan/Makefile new file mode 100644 index 000000000000..b2dbb4fb2793 --- /dev/null +++ b/drivers/net/can/flexcan/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o + +flexcan-y := dev.o drv.o mbm.o diff --git a/drivers/net/can/flexcan/dev.c b/drivers/net/can/flexcan/dev.c new file mode 100644 index 000000000000..05a48d27236e --- /dev/null +++ b/drivers/net/can/flexcan/dev.c @@ -0,0 +1,743 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file dev.c + * + * @brief Driver for Freescale CAN Controller FlexCAN. + * + * @ingroup can + */ +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/unistd.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/fsl_devices.h> + +#include <linux/module.h> +#ifdef CONFIG_ARCH_MXS +#include <mach/device.h> +#endif +#include "flexcan.h" + +#define DEFAULT_BITRATE 500000 +#define TIME_SEGMENT_MIN 8 +#define TIME_SEGMENT_MAX 25 +#define TIME_SEGMENT_MID ((TIME_SEGMENT_MIN + TIME_SEGMENT_MAX)/2) + +struct time_segment { + char propseg; + char pseg1; + char pseg2; +}; + +struct time_segment time_segments[] = { + { /* total 8 timequanta */ + 1, 2, 1 + }, + { /* total 9 timequanta */ + 1, 2, 2 + }, + { /* total 10 timequanta */ + 2, 2, 2 + }, + { /* total 11 timequanta */ + 2, 2, 3 + }, + { /* total 12 timequanta */ + 2, 3, 3 + }, + { /* total 13 timequanta */ + 3, 3, 3 + }, + { /* total 14 timequanta */ + 3, 3, 4 + }, + { /* total 15 timequanta */ + 3, 4, 4 + }, + { /* total 16 timequanta */ + 4, 4, 4 + }, + { /* total 17 timequanta */ + 4, 4, 5 + }, + { /* total 18 timequanta */ + 4, 5, 5 + }, + { /* total 19 timequanta */ + 5, 5, 5 + }, + { /* total 20 timequanta */ + 5, 5, 6 + }, + { /* total 21 timequanta */ + 5, 6, 6 + }, + { /* total 22 timequanta */ + 6, 6, 6 + }, + { /* total 23 timequanta */ + 6, 6, 7 + }, + { /* total 24 timequanta */ + 6, 7, 7 + }, + { /* total 25 timequanta */ + 7, 7, 7 + }, +}; + +enum { + FLEXCAN_ATTR_STATE = 0, + FLEXCAN_ATTR_BITRATE, + FLEXCAN_ATTR_BR_PRESDIV, + FLEXCAN_ATTR_BR_RJW, + FLEXCAN_ATTR_BR_PROPSEG, + FLEXCAN_ATTR_BR_PSEG1, + FLEXCAN_ATTR_BR_PSEG2, + FLEXCAN_ATTR_BR_CLKSRC, + FLEXCAN_ATTR_MAXMB, + FLEXCAN_ATTR_XMIT_MAXMB, + FLEXCAN_ATTR_FIFO, + FLEXCAN_ATTR_WAKEUP, + FLEXCAN_ATTR_SRX_DIS, + FLEXCAN_ATTR_WAK_SRC, + FLEXCAN_ATTR_BCC, + FLEXCAN_ATTR_LOCAL_PRIORITY, + FLEXCAN_ATTR_ABORT, + FLEXCAN_ATTR_LOOPBACK, + FLEXCAN_ATTR_SMP, + FLEXCAN_ATTR_BOFF_REC, + FLEXCAN_ATTR_TSYN, + FLEXCAN_ATTR_LISTEN, + FLEXCAN_ATTR_EXTEND_MSG, + FLEXCAN_ATTR_STANDARD_MSG, +#ifdef CONFIG_CAN_DEBUG_DEVICES + FLEXCAN_ATTR_DUMP_REG, + FLEXCAN_ATTR_DUMP_XMIT_MB, + FLEXCAN_ATTR_DUMP_RX_MB, +#endif + FLEXCAN_ATTR_MAX +}; + +static ssize_t flexcan_show_attr(struct device *dev, + struct device_attribute *attr, char *buf); +static ssize_t flexcan_set_attr(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count); + +static struct device_attribute flexcan_dev_attr[FLEXCAN_ATTR_MAX] = { + [FLEXCAN_ATTR_STATE] = __ATTR(state, 0444, flexcan_show_attr, NULL), + [FLEXCAN_ATTR_BITRATE] = + __ATTR(bitrate, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_PRESDIV] = + __ATTR(br_presdiv, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_RJW] = + __ATTR(br_rjw, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_PROPSEG] = + __ATTR(br_propseg, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_PSEG1] = + __ATTR(br_pseg1, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_PSEG2] = + __ATTR(br_pseg2, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BR_CLKSRC] = + __ATTR(br_clksrc, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_MAXMB] = + __ATTR(maxmb, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_XMIT_MAXMB] = + __ATTR(xmit_maxmb, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_FIFO] = + __ATTR(fifo, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_WAKEUP] = + __ATTR(wakeup, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_SRX_DIS] = + __ATTR(srx_dis, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_WAK_SRC] = + __ATTR(wak_src, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BCC] = + __ATTR(bcc, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_LOCAL_PRIORITY] = + __ATTR(local_priority, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_ABORT] = + __ATTR(abort, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_LOOPBACK] = + __ATTR(loopback, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_SMP] = + __ATTR(smp, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_BOFF_REC] = + __ATTR(boff_rec, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_TSYN] = + __ATTR(tsyn, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_LISTEN] = + __ATTR(listen, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_EXTEND_MSG] = + __ATTR(ext_msg, 0644, flexcan_show_attr, flexcan_set_attr), + [FLEXCAN_ATTR_STANDARD_MSG] = + __ATTR(std_msg, 0644, flexcan_show_attr, flexcan_set_attr), +#ifdef CONFIG_CAN_DEBUG_DEVICES + [FLEXCAN_ATTR_DUMP_REG] = + __ATTR(dump_reg, 0444, flexcan_show_attr, NULL), + [FLEXCAN_ATTR_DUMP_XMIT_MB] = + __ATTR(dump_xmit_mb, 0444, flexcan_show_attr, NULL), + [FLEXCAN_ATTR_DUMP_RX_MB] = + __ATTR(dump_rx_mb, 0444, flexcan_show_attr, NULL), +#endif +}; + +static void flexcan_set_bitrate(struct flexcan_device *flexcan, int bitrate) +{ + /* TODO:: implement in future + * based on the bitrate to get the timing of + * presdiv, pseg1, pseg2, propseg + */ + int i, rate, div; + bool found = false; + struct time_segment *segment; + rate = clk_get_rate(flexcan->clk); + + if (!bitrate) + bitrate = DEFAULT_BITRATE; + + if (rate % bitrate == 0) { + div = rate / bitrate; + for (i = TIME_SEGMENT_MID; i <= TIME_SEGMENT_MAX; i++) { + if (div % i == 0) { + found = true; + break; + } + } + if (!found) { + for (i = TIME_SEGMENT_MID - 1; + i >= TIME_SEGMENT_MIN; i--) { + if (div % i == 0) { + found = true; + break; + } + } + + } + } + + if (found) { + segment = &time_segments[i - TIME_SEGMENT_MIN]; + flexcan->br_presdiv = div/i - 1; + flexcan->br_propseg = segment->propseg; + flexcan->br_pseg1 = segment->pseg1; + flexcan->br_pseg2 = segment->pseg2; + flexcan->bitrate = bitrate; + } else { + pr_info("The bitrate %d can't supported with clock \ + rate of %d \n", bitrate, rate); + } +} + +static void flexcan_update_bitrate(struct flexcan_device *flexcan) +{ + int rate, div; + struct flexcan_platform_data *plat_data; + plat_data = flexcan->dev->dev.platform_data; + + if (plat_data->root_clk_id) + rate = clk_get_rate(flexcan->clk); + else { + if (flexcan->br_clksrc) + rate = clk_get_rate(flexcan->clk); + else { + struct clk *clk; + clk = clk_get(NULL, "ckih"); + if (!clk) + return; + rate = clk_get_rate(clk); + clk_put(clk); + } + } + if (!rate) + return; + + div = (flexcan->br_presdiv + 1); + div *= + (flexcan->br_propseg + flexcan->br_pseg1 + flexcan->br_pseg2 + 4); + flexcan->bitrate = (rate + div - 1) / div; +} + +#ifdef CONFIG_CAN_DEBUG_DEVICES +static int flexcan_dump_reg(struct flexcan_device *flexcan, char *buf) +{ + int ret = 0; + unsigned int reg; + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + ret += sprintf(buf + ret, "MCR::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_CTRL); + ret += sprintf(buf + ret, "CTRL::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_RXGMASK); + ret += sprintf(buf + ret, "RXGMASK::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_RX14MASK); + ret += sprintf(buf + ret, "RX14MASK::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_RX15MASK); + ret += sprintf(buf + ret, "RX15MASK::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_ECR); + ret += sprintf(buf + ret, "ECR::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_ESR); + ret += sprintf(buf + ret, "ESR::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_IMASK2); + ret += sprintf(buf + ret, "IMASK2::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_IMASK1); + ret += sprintf(buf + ret, "IMASK1::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG2); + ret += sprintf(buf + ret, "IFLAG2::0x%x\n", reg); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG1); + ret += sprintf(buf + ret, "IFLAG1::0x%x\n", reg); + return ret; +} + +static int flexcan_dump_xmit_mb(struct flexcan_device *flexcan, char *buf) +{ + int ret = 0, i; + i = flexcan->xmit_maxmb + 1; + for (; i <= flexcan->maxmb; i++) + ret += + sprintf(buf + ret, + "mb[%d]::CS:0x%x ID:0x%x DATA[1~2]:0x%02x,0x%02x\n", + i, flexcan->hwmb[i].mb_cs, + flexcan->hwmb[i].mb_id, flexcan->hwmb[i].mb_data[1], + flexcan->hwmb[i].mb_data[2]); + return ret; +} + +static int flexcan_dump_rx_mb(struct flexcan_device *flexcan, char *buf) +{ + int ret = 0, i; + for (i = 0; i <= flexcan->xmit_maxmb; i++) + ret += + sprintf(buf + ret, + "mb[%d]::CS:0x%x ID:0x%x DATA[1~2]:0x%02x,0x%02x\n", + i, flexcan->hwmb[i].mb_cs, + flexcan->hwmb[i].mb_id, flexcan->hwmb[i].mb_data[1], + flexcan->hwmb[i].mb_data[2]); + return ret; +} +#endif + +static ssize_t flexcan_show_state(struct net_device *net, char *buf) +{ + int ret, esr; + struct flexcan_device *flexcan = netdev_priv(net); + ret = sprintf(buf, "%s::", netif_running(net) ? "Start" : "Stop"); + if (netif_carrier_ok(net)) { + esr = __raw_readl(flexcan->io_base + CAN_HW_REG_ESR); + switch ((esr & __ESR_FLT_CONF_MASK) >> __ESR_FLT_CONF_OFF) { + case 0: + ret += sprintf(buf + ret, "normal\n"); + break; + case 1: + ret += sprintf(buf + ret, "error passive\n"); + break; + default: + ret += sprintf(buf + ret, "bus off\n"); + } + } else + ret += sprintf(buf + ret, "bus off\n"); + return ret; +} + +static ssize_t flexcan_show_attr(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int attr_id; + struct net_device *net; + struct flexcan_device *flexcan; + + net = dev_get_drvdata(dev); + BUG_ON(!net); + flexcan = netdev_priv(net); + BUG_ON(!flexcan); + + attr_id = attr - flexcan_dev_attr; + switch (attr_id) { + case FLEXCAN_ATTR_STATE: + return flexcan_show_state(net, buf); + case FLEXCAN_ATTR_BITRATE: + return sprintf(buf, "%d\n", flexcan->bitrate); + case FLEXCAN_ATTR_BR_PRESDIV: + return sprintf(buf, "%d\n", flexcan->br_presdiv + 1); + case FLEXCAN_ATTR_BR_RJW: + return sprintf(buf, "%d\n", flexcan->br_rjw); + case FLEXCAN_ATTR_BR_PROPSEG: + return sprintf(buf, "%d\n", flexcan->br_propseg + 1); + case FLEXCAN_ATTR_BR_PSEG1: + return sprintf(buf, "%d\n", flexcan->br_pseg1 + 1); + case FLEXCAN_ATTR_BR_PSEG2: + return sprintf(buf, "%d\n", flexcan->br_pseg2 + 1); + case FLEXCAN_ATTR_BR_CLKSRC: + return sprintf(buf, "%s\n", flexcan->br_clksrc ? "bus" : "osc"); + case FLEXCAN_ATTR_MAXMB: + return sprintf(buf, "%d\n", flexcan->maxmb + 1); + case FLEXCAN_ATTR_XMIT_MAXMB: + return sprintf(buf, "%d\n", flexcan->xmit_maxmb + 1); + case FLEXCAN_ATTR_FIFO: + return sprintf(buf, "%d\n", flexcan->fifo); + case FLEXCAN_ATTR_WAKEUP: + return sprintf(buf, "%d\n", flexcan->wakeup); + case FLEXCAN_ATTR_SRX_DIS: + return sprintf(buf, "%d\n", flexcan->srx_dis); + case FLEXCAN_ATTR_WAK_SRC: + return sprintf(buf, "%d\n", flexcan->wak_src); + case FLEXCAN_ATTR_BCC: + return sprintf(buf, "%d\n", flexcan->bcc); + case FLEXCAN_ATTR_LOCAL_PRIORITY: + return sprintf(buf, "%d\n", flexcan->lprio); + case FLEXCAN_ATTR_ABORT: + return sprintf(buf, "%d\n", flexcan->abort); + case FLEXCAN_ATTR_LOOPBACK: + return sprintf(buf, "%d\n", flexcan->loopback); + case FLEXCAN_ATTR_SMP: + return sprintf(buf, "%d\n", flexcan->smp); + case FLEXCAN_ATTR_BOFF_REC: + return sprintf(buf, "%d\n", flexcan->boff_rec); + case FLEXCAN_ATTR_TSYN: + return sprintf(buf, "%d\n", flexcan->tsyn); + case FLEXCAN_ATTR_LISTEN: + return sprintf(buf, "%d\n", flexcan->listen); + case FLEXCAN_ATTR_EXTEND_MSG: + return sprintf(buf, "%d\n", flexcan->ext_msg); + case FLEXCAN_ATTR_STANDARD_MSG: + return sprintf(buf, "%d\n", flexcan->std_msg); +#ifdef CONFIG_CAN_DEBUG_DEVICES + case FLEXCAN_ATTR_DUMP_REG: + return flexcan_dump_reg(flexcan, buf); + case FLEXCAN_ATTR_DUMP_XMIT_MB: + return flexcan_dump_xmit_mb(flexcan, buf); + case FLEXCAN_ATTR_DUMP_RX_MB: + return flexcan_dump_rx_mb(flexcan, buf); +#endif + default: + return sprintf(buf, "%s:%p->%p\n", __func__, flexcan_dev_attr, + attr); + } +} + +static ssize_t flexcan_set_attr(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + int attr_id, tmp; + struct net_device *net; + struct flexcan_device *flexcan; + + net = dev_get_drvdata(dev); + BUG_ON(!net); + flexcan = netdev_priv(net); + BUG_ON(!flexcan); + + attr_id = attr - flexcan_dev_attr; + + if (mutex_lock_interruptible(&flexcan->mutex)) + return count; + + if (netif_running(net)) + goto set_finish; + + if (attr_id == FLEXCAN_ATTR_BR_CLKSRC) { + if (!strncasecmp(buf, "bus", 3)) + flexcan->br_clksrc = 1; + else if (!strncasecmp(buf, "osc", 3)) + flexcan->br_clksrc = 0; + goto set_finish; + } + + tmp = simple_strtoul(buf, NULL, 0); + switch (attr_id) { + case FLEXCAN_ATTR_BITRATE: + flexcan_set_bitrate(flexcan, tmp); + break; + case FLEXCAN_ATTR_BR_PRESDIV: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_PRESDIV)) { + flexcan->br_presdiv = tmp - 1; + flexcan_update_bitrate(flexcan); + } + break; + case FLEXCAN_ATTR_BR_RJW: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_RJW)) + flexcan->br_rjw = tmp - 1; + break; + case FLEXCAN_ATTR_BR_PROPSEG: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_PROPSEG)) { + flexcan->br_propseg = tmp - 1; + flexcan_update_bitrate(flexcan); + } + break; + case FLEXCAN_ATTR_BR_PSEG1: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_PSEG1)) { + flexcan->br_pseg1 = tmp - 1; + flexcan_update_bitrate(flexcan); + } + break; + case FLEXCAN_ATTR_BR_PSEG2: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_PSEG2)) { + flexcan->br_pseg2 = tmp - 1; + flexcan_update_bitrate(flexcan); + } + break; + case FLEXCAN_ATTR_MAXMB: + if ((tmp > 0) && (tmp <= FLEXCAN_MAX_MB)) { + if (flexcan->maxmb != (tmp - 1)) { + flexcan->maxmb = tmp - 1; + if (flexcan->xmit_maxmb < flexcan->maxmb) + flexcan->xmit_maxmb = flexcan->maxmb; + } + } + break; + case FLEXCAN_ATTR_XMIT_MAXMB: + if ((tmp > 0) && (tmp <= (flexcan->maxmb + 1))) { + if (flexcan->xmit_maxmb != (tmp - 1)) + flexcan->xmit_maxmb = tmp - 1; + } + break; + case FLEXCAN_ATTR_FIFO: + flexcan->fifo = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_WAKEUP: + flexcan->wakeup = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_SRX_DIS: + flexcan->srx_dis = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_WAK_SRC: + flexcan->wak_src = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_BCC: + flexcan->bcc = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_LOCAL_PRIORITY: + flexcan->lprio = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_ABORT: + flexcan->abort = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_LOOPBACK: + flexcan->loopback = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_SMP: + flexcan->smp = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_BOFF_REC: + flexcan->boff_rec = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_TSYN: + flexcan->tsyn = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_LISTEN: + flexcan->listen = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_EXTEND_MSG: + flexcan->ext_msg = tmp ? 1 : 0; + break; + case FLEXCAN_ATTR_STANDARD_MSG: + flexcan->std_msg = tmp ? 1 : 0; + break; + } + set_finish: + mutex_unlock(&flexcan->mutex); + return count; +} + +static void flexcan_device_default(struct flexcan_device *dev) +{ + struct platform_device *pdev = dev->dev; + struct flexcan_platform_data *plat_data = (pdev->dev).platform_data; + dev->br_clksrc = plat_data->br_clksrc; + dev->br_rjw = plat_data->br_rjw; + dev->br_presdiv = plat_data->br_presdiv; + dev->br_propseg = plat_data->br_propseg; + dev->br_pseg1 = plat_data->br_pseg1; + dev->br_pseg2 = plat_data->br_pseg2; + + dev->bcc = plat_data->bcc; + dev->srx_dis = plat_data->srx_dis; + dev->smp = plat_data->smp; + dev->boff_rec = plat_data->boff_rec; + + dev->maxmb = FLEXCAN_MAX_MB - 1; + dev->xmit_maxmb = (FLEXCAN_MAX_MB >> 1) - 1; + dev->xmit_mb = dev->maxmb - dev->xmit_maxmb; + + dev->ext_msg = plat_data->ext_msg; + dev->std_msg = plat_data->std_msg; +} + +static int flexcan_device_attach(struct flexcan_device *flexcan) +{ + int ret; + struct resource *res; + struct platform_device *pdev = flexcan->dev; + struct flexcan_platform_data *plat_data = (pdev->dev).platform_data; + struct clk *can_root_clk; + + res = platform_get_resource(flexcan->dev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + flexcan->io_base = ioremap(res->start, res->end - res->start + 1); + if (!flexcan->io_base) + return -ENOMEM; + + flexcan->irq = platform_get_irq(flexcan->dev, 0); + if (!flexcan->irq) { + ret = -ENODEV; + goto no_irq_err; + } + + ret = -EINVAL; + if (plat_data) { + if (plat_data->core_reg) { + flexcan->core_reg = regulator_get(&pdev->dev, + plat_data->core_reg); + if (!flexcan->core_reg) + goto plat_err; + } + + if (plat_data->io_reg) { + flexcan->io_reg = regulator_get(&pdev->dev, + plat_data->io_reg); + if (!flexcan->io_reg) + goto plat_err; + } + } + flexcan->clk = clk_get(&(flexcan->dev)->dev, "can_clk"); + if (plat_data->root_clk_id) { + can_root_clk = clk_get(NULL, plat_data->root_clk_id); + clk_set_parent(flexcan->clk, can_root_clk); + } + flexcan->hwmb = (struct can_hw_mb *)(flexcan->io_base + CAN_MB_BASE); + flexcan->rx_mask = (unsigned int *)(flexcan->io_base + CAN_RXMASK_BASE); + + return 0; + plat_err: + if (flexcan->core_reg) { + regulator_put(flexcan->core_reg); + flexcan->core_reg = NULL; + } + no_irq_err: + if (flexcan->io_base) + iounmap(flexcan->io_base); + return ret; +} + +static void flexcan_device_detach(struct flexcan_device *flexcan) +{ + if (flexcan->clk) { + clk_put(flexcan->clk); + flexcan->clk = NULL; + } + + if (flexcan->io_reg) { + regulator_put(flexcan->io_reg); + flexcan->io_reg = NULL; + } + + if (flexcan->core_reg) { + regulator_put(flexcan->core_reg); + flexcan->core_reg = NULL; + } + + if (flexcan->io_base) + iounmap(flexcan->io_base); +} + +/*! + * @brief The function allocates can device. + * + * @param pdev the pointer of platform device. + * @param setup the initial function pointer of network device. + * + * @return none + */ +struct net_device *flexcan_device_alloc(struct platform_device *pdev, + void (*setup) (struct net_device *dev)) +{ + struct flexcan_device *flexcan; + struct net_device *net; + int i, num; + + net = alloc_netdev(sizeof(*flexcan), "can%d", setup); + if (net == NULL) { + printk(KERN_ERR "Allocate netdevice for FlexCAN fail!\n"); + return NULL; + } + flexcan = netdev_priv(net); + memset(flexcan, 0, sizeof(*flexcan)); + + mutex_init(&flexcan->mutex); + init_timer(&flexcan->timer); + + flexcan->dev = pdev; + if (flexcan_device_attach(flexcan)) { + printk(KERN_ERR "Attach FlexCAN fail!\n"); + free_netdev(net); + return NULL; + } + flexcan_device_default(flexcan); + flexcan_set_bitrate(flexcan, flexcan->bitrate); + flexcan_update_bitrate(flexcan); + + num = ARRAY_SIZE(flexcan_dev_attr); + + for (i = 0; i < num; i++) { + if (device_create_file(&pdev->dev, flexcan_dev_attr + i)) { + printk(KERN_ERR "Create attribute file fail!\n"); + break; + } + } + + if (i != num) { + for (; i >= 0; i--) + device_remove_file(&pdev->dev, flexcan_dev_attr + i); + free_netdev(net); + return NULL; + } + dev_set_drvdata(&pdev->dev, net); + return net; +} + +/*! + * @brief The function frees can device. + * + * @param pdev the pointer of platform device. + * + * @return none + */ +void flexcan_device_free(struct platform_device *pdev) +{ + struct net_device *net; + struct flexcan_device *flexcan; + int i, num; + net = (struct net_device *)dev_get_drvdata(&pdev->dev); + + unregister_netdev(net); + flexcan = netdev_priv(net); + del_timer(&flexcan->timer); + + num = ARRAY_SIZE(flexcan_dev_attr); + + for (i = 0; i < num; i++) + device_remove_file(&pdev->dev, flexcan_dev_attr + i); + + flexcan_device_detach(netdev_priv(net)); + free_netdev(net); +} diff --git a/drivers/net/can/flexcan/drv.c b/drivers/net/can/flexcan/drv.c new file mode 100644 index 000000000000..f0a408d5640f --- /dev/null +++ b/drivers/net/can/flexcan/drv.c @@ -0,0 +1,628 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file drv.c + * + * @brief Driver for Freescale CAN Controller FlexCAN. + * + * @ingroup can + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/fsl_devices.h> +#include <linux/random.h> +#include "flexcan.h" + +static void flexcan_hw_start(struct flexcan_device *flexcan) +{ + unsigned int reg; + if ((flexcan->maxmb + 1) > 32) { + __raw_writel(0xFFFFFFFF, flexcan->io_base + CAN_HW_REG_IMASK1); + reg = (1 << (flexcan->maxmb - 31)) - 1; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_IMASK2); + } else { + reg = (1 << (flexcan->maxmb + 1)) - 1; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_IMASK1); + __raw_writel(0, flexcan->io_base + CAN_HW_REG_IMASK2); + } + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR) & (~__MCR_HALT); + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_MCR); +} + +static void flexcan_hw_stop(struct flexcan_device *flexcan) +{ + unsigned int reg; + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + __raw_writel(reg | __MCR_HALT, flexcan->io_base + CAN_HW_REG_MCR); +} + +static int flexcan_hw_reset(struct flexcan_device *flexcan) +{ + unsigned int reg; + int timeout = 100000; + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + __raw_writel(reg | __MCR_MDIS, flexcan->io_base + CAN_HW_REG_MCR); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_CTRL); + if (flexcan->br_clksrc) + reg |= __CTRL_CLK_SRC; + else + reg &= ~__CTRL_CLK_SRC; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_CTRL); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR) & (~__MCR_MDIS); + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_MCR); + reg |= __MCR_SOFT_RST; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_MCR); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + while (reg & __MCR_SOFT_RST) { + if (--timeout <= 0) { + printk(KERN_ERR "Flexcan software Reset Timeouted\n"); + return -1; + } + udelay(10); + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + } + return 0; +} + +static inline void flexcan_mcr_setup(struct flexcan_device *flexcan) +{ + unsigned int reg; + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + reg &= ~(__MCR_MAX_MB_MASK | __MCR_WAK_MSK | __MCR_MAX_IDAM_MASK); + + if (flexcan->fifo) + reg |= __MCR_FEN; + else + reg &= ~__MCR_FEN; + + if (flexcan->wakeup) + reg |= __MCR_SLF_WAK | __MCR_WAK_MSK; + else + reg &= ~(__MCR_SLF_WAK | __MCR_WAK_MSK); + + if (flexcan->wak_src) + reg |= __MCR_WAK_SRC; + else + reg &= ~__MCR_WAK_SRC; + + if (flexcan->srx_dis) + reg |= __MCR_SRX_DIS; + else + reg &= ~__MCR_SRX_DIS; + + if (flexcan->bcc) + reg |= __MCR_BCC; + else + reg &= ~__MCR_BCC; + + if (flexcan->lprio) + reg |= __MCR_LPRIO_EN; + else + reg &= ~__MCR_LPRIO_EN; + + if (flexcan->abort) + reg |= __MCR_AEN; + else + reg &= ~__MCR_AEN; + + reg |= (flexcan->maxmb << __MCR_MAX_MB_OFFSET); + reg |= __MCR_DOZE | __MCR_MAX_IDAM_C; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_MCR); +} + +static inline void flexcan_ctrl_setup(struct flexcan_device *flexcan) +{ + unsigned int reg; + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_CTRL); + reg &= ~(__CTRL_PRESDIV_MASK | __CTRL_RJW_MASK | __CTRL_PSEG1_MASK | + __CTRL_PSEG2_MASK | __CTRL_PROPSEG_MASK); + + if (flexcan->loopback) + reg |= __CTRL_LPB; + else + reg &= ~__CTRL_LPB; + + if (flexcan->smp) + reg |= __CTRL_SMP; + else + reg &= ~__CTRL_SMP; + + if (flexcan->boff_rec) + reg |= __CTRL_BOFF_REC; + else + reg &= ~__CTRL_BOFF_REC; + + if (flexcan->tsyn) + reg |= __CTRL_TSYN; + else + reg &= ~__CTRL_TSYN; + + if (flexcan->listen) + reg |= __CTRL_LOM; + else + reg &= ~__CTRL_LOM; + + reg |= (flexcan->br_presdiv << __CTRL_PRESDIV_OFFSET) | + (flexcan->br_rjw << __CTRL_RJW_OFFSET) | + (flexcan->br_pseg1 << __CTRL_PSEG1_OFFSET) | + (flexcan->br_pseg2 << __CTRL_PSEG2_OFFSET) | + (flexcan->br_propseg << __CTRL_PROPSEG_OFFSET); + + reg &= ~__CTRL_LBUF; + + reg |= __CTRL_TWRN_MSK | __CTRL_RWRN_MSK | __CTRL_BOFF_MSK | + __CTRL_ERR_MSK; + + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_CTRL); +} + +static int flexcan_hw_restart(struct net_device *dev) +{ + unsigned int reg; + struct flexcan_device *flexcan = netdev_priv(dev); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + if (reg & __MCR_SOFT_RST) + return 1; + + flexcan_mcr_setup(flexcan); + + __raw_writel(0, flexcan->io_base + CAN_HW_REG_IMASK2); + __raw_writel(0, flexcan->io_base + CAN_HW_REG_IMASK1); + + __raw_writel(0xFFFFFFFF, flexcan->io_base + CAN_HW_REG_IFLAG2); + __raw_writel(0xFFFFFFFF, flexcan->io_base + CAN_HW_REG_IFLAG1); + + __raw_writel(0, flexcan->io_base + CAN_HW_REG_ECR); + + flexcan_mbm_init(flexcan); + netif_carrier_on(dev); + flexcan_hw_start(flexcan); + + if (netif_queue_stopped(dev)) + netif_start_queue(dev); + + return 0; +} + +static void flexcan_hw_watch(unsigned long data) +{ + unsigned int reg, ecr; + struct net_device *dev = (struct net_device *)data; + struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL; + + BUG_ON(!flexcan); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + if (reg & __MCR_MDIS) { + if (flexcan_hw_restart(dev)) + mod_timer(&flexcan->timer, HZ / 20); + return; + } + ecr = __raw_readl(flexcan->io_base + CAN_HW_REG_ECR); + if (flexcan->boff_rec) { + if (((reg & __ESR_FLT_CONF_MASK) >> __ESR_FLT_CONF_OFF) > 1) { + reg |= __MCR_SOFT_RST; + __raw_writel(reg, flexcan->io_base + CAN_HW_REG_MCR); + mod_timer(&flexcan->timer, HZ / 20); + return; + } + netif_carrier_on(dev); + } +} + +static void flexcan_hw_busoff(struct net_device *dev) +{ + struct flexcan_device *flexcan = netdev_priv(dev); + unsigned int reg; + + netif_carrier_off(dev); + + flexcan->timer.function = flexcan_hw_watch; + flexcan->timer.data = (unsigned long)dev; + + if (flexcan->boff_rec) { + mod_timer(&flexcan->timer, HZ / 10); + return; + } + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_MCR); + __raw_writel(reg | __MCR_SOFT_RST, flexcan->io_base + CAN_HW_REG_MCR); + mod_timer(&flexcan->timer, HZ / 20); +} + +static int flexcan_hw_open(struct flexcan_device *flexcan) +{ + if (flexcan_hw_reset(flexcan)) + return -EFAULT; + + flexcan_mcr_setup(flexcan); + flexcan_ctrl_setup(flexcan); + + __raw_writel(0, flexcan->io_base + CAN_HW_REG_IMASK2); + __raw_writel(0, flexcan->io_base + CAN_HW_REG_IMASK1); + + __raw_writel(0xFFFFFFFF, flexcan->io_base + CAN_HW_REG_IFLAG2); + __raw_writel(0xFFFFFFFF, flexcan->io_base + CAN_HW_REG_IFLAG1); + + __raw_writel(0, flexcan->io_base + CAN_HW_REG_ECR); + return 0; +} + +static void flexcan_err_handler(struct net_device *dev) +{ + struct flexcan_device *flexcan = netdev_priv(dev); + struct sk_buff *skb; + struct can_frame *frame; + unsigned int esr, ecr; + + esr = __raw_readl(flexcan->io_base + CAN_HW_REG_ESR); + __raw_writel(esr & __ESR_INTERRUPTS, flexcan->io_base + CAN_HW_REG_ESR); + + if (esr & __ESR_WAK_INT) + return; + + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (!skb) { + printk(KERN_ERR "%s: allocates skb fail in\n", __func__); + return; + } + frame = (struct can_frame *)skb_put(skb, sizeof(*frame)); + memset(frame, 0, sizeof(*frame)); + frame->can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; + frame->can_dlc = CAN_ERR_DLC; + + if (esr & __ESR_TWRN_INT) + frame->data[1] |= CAN_ERR_CRTL_TX_WARNING; + + if (esr & __ESR_RWRN_INT) + frame->data[1] |= CAN_ERR_CRTL_RX_WARNING; + + if (esr & __ESR_BOFF_INT) + frame->can_id |= CAN_ERR_BUSOFF; + + if (esr & __ESR_ERR_INT) { + if (esr & __ESR_BIT1_ERR) + frame->data[2] |= CAN_ERR_PROT_BIT1; + + if (esr & __ESR_BIT0_ERR) + frame->data[2] |= CAN_ERR_PROT_BIT0; + + if (esr & __ESR_ACK_ERR) + frame->can_id |= CAN_ERR_ACK; + + /*TODO:// if (esr & __ESR_CRC_ERR) */ + + if (esr & __ESR_FRM_ERR) + frame->data[2] |= CAN_ERR_PROT_FORM; + + if (esr & __ESR_STF_ERR) + frame->data[2] |= CAN_ERR_PROT_STUFF; + + ecr = __raw_readl(flexcan->io_base + CAN_HW_REG_ECR); + switch ((esr & __ESR_FLT_CONF_MASK) >> __ESR_FLT_CONF_OFF) { + case 0: + if (__ECR_TX_ERR_COUNTER(ecr) >= __ECR_ACTIVE_THRESHOLD) + frame->data[1] |= CAN_ERR_CRTL_TX_WARNING; + if (__ECR_RX_ERR_COUNTER(ecr) >= __ECR_ACTIVE_THRESHOLD) + frame->data[1] |= CAN_ERR_CRTL_RX_WARNING; + break; + case 1: + if (__ECR_TX_ERR_COUNTER(ecr) >= + __ECR_PASSIVE_THRESHOLD) + frame->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; + + if (__ECR_RX_ERR_COUNTER(ecr) >= + __ECR_PASSIVE_THRESHOLD) + frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; + break; + default: + frame->can_id |= CAN_ERR_BUSOFF; + } + } + + if (frame->can_id & CAN_ERR_BUSOFF) + flexcan_hw_busoff(dev); + + skb->dev = dev; + skb->ip_summed = CHECKSUM_UNNECESSARY; + netif_receive_skb(skb); +} + +static irqreturn_t flexcan_irq_handler(int irq, void *data) +{ + struct net_device *dev = (struct net_device *)data; + struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL; + unsigned int reg; + + BUG_ON(!flexcan); + + reg = __raw_readl(flexcan->io_base + CAN_HW_REG_ESR); + if (reg & __ESR_INTERRUPTS) { + flexcan_err_handler(dev); + return IRQ_HANDLED; + } + + flexcan_mbm_isr(dev); + return IRQ_HANDLED; +} + +static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct can_frame *frame = (struct can_frame *)skb->data; + struct flexcan_device *flexcan = netdev_priv(dev); + struct net_device_stats *stats = &dev->stats; + + BUG_ON(!flexcan); + + if (frame->can_dlc > 8) + return -EINVAL; + + if (!flexcan_mbm_xmit(flexcan, frame)) { + dev_kfree_skb(skb); + stats->tx_bytes += frame->can_dlc; + stats->tx_packets++; + dev->trans_start = jiffies; + return NETDEV_TX_OK; + } + netif_stop_queue(dev); + return NETDEV_TX_BUSY; +} + +static int flexcan_open(struct net_device *dev) +{ + struct flexcan_device *flexcan; + struct platform_device *pdev; + struct flexcan_platform_data *plat_data; + + flexcan = netdev_priv(dev); + BUG_ON(!flexcan); + + pdev = flexcan->dev; + plat_data = (pdev->dev).platform_data; + if (plat_data && plat_data->active) + plat_data->active(pdev->id); + + if (flexcan->clk) + if (clk_enable(flexcan->clk)) + goto clk_err; + + if (flexcan->core_reg) + if (regulator_enable(flexcan->core_reg)) + goto core_reg_err; + + if (flexcan->io_reg) + if (regulator_enable(flexcan->io_reg)) + goto io_reg_err; + + if (plat_data && plat_data->xcvr_enable) + plat_data->xcvr_enable(pdev->id, 1); + + if (request_irq(flexcan->irq, flexcan_irq_handler, IRQF_SHARED, + dev->name, dev)) + goto irq_err; + add_interrupt_randomness(flexcan->irq); + + if (flexcan_hw_open(flexcan)) + goto open_err; + + flexcan_mbm_init(flexcan); + netif_carrier_on(dev); + flexcan_hw_start(flexcan); + return 0; + open_err: + free_irq(flexcan->irq, dev); + irq_err: + if (plat_data && plat_data->xcvr_enable) + plat_data->xcvr_enable(pdev->id, 0); + + if (flexcan->io_reg) + regulator_disable(flexcan->io_reg); + io_reg_err: + if (flexcan->core_reg) + regulator_disable(flexcan->core_reg); + core_reg_err: + if (flexcan->clk) + clk_disable(flexcan->clk); + clk_err: + if (plat_data && plat_data->inactive) + plat_data->inactive(pdev->id); + return -ENODEV; +} + +static int flexcan_stop(struct net_device *dev) +{ + struct flexcan_device *flexcan; + struct platform_device *pdev; + struct flexcan_platform_data *plat_data; + + flexcan = netdev_priv(dev); + + BUG_ON(!flexcan); + + pdev = flexcan->dev; + plat_data = (pdev->dev).platform_data; + + flexcan_hw_stop(flexcan); + + free_irq(flexcan->irq, dev); + + if (plat_data && plat_data->xcvr_enable) + plat_data->xcvr_enable(pdev->id, 0); + + if (flexcan->io_reg) + regulator_disable(flexcan->io_reg); + if (flexcan->core_reg) + regulator_disable(flexcan->core_reg); + if (flexcan->clk) + clk_disable(flexcan->clk); + if (plat_data && plat_data->inactive) + plat_data->inactive(pdev->id); + return 0; +} + +static struct net_device_ops flexcan_netdev_ops = { + .ndo_open = flexcan_open, + .ndo_stop = flexcan_stop, + .ndo_start_xmit = flexcan_start_xmit, +}; + +static void flexcan_setup(struct net_device *dev) +{ + dev->type = ARPHRD_CAN; + dev->mtu = sizeof(struct can_frame); + dev->hard_header_len = 0; + dev->addr_len = 0; + dev->tx_queue_len = FLEXCAN_MAX_MB; + dev->flags = IFF_NOARP; + dev->features = NETIF_F_NO_CSUM; + + dev->netdev_ops = &flexcan_netdev_ops; +} + +static int flexcan_probe(struct platform_device *pdev) +{ + struct net_device *net; + net = flexcan_device_alloc(pdev, flexcan_setup); + if (!net) + return -ENOMEM; + + if (register_netdev(net)) { + flexcan_device_free(pdev); + return -ENODEV; + } + return 0; +} + +static int flexcan_remove(struct platform_device *pdev) +{ + flexcan_device_free(pdev); + return 0; +} + +static int flexcan_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct net_device *net; + struct flexcan_device *flexcan; + struct flexcan_platform_data *plat_data; + net = (struct net_device *)dev_get_drvdata(&pdev->dev); + flexcan = netdev_priv(net); + + BUG_ON(!flexcan); + + if (!(net->flags & IFF_UP)) + return 0; + if (flexcan->wakeup) + set_irq_wake(flexcan->irq, 1); + else { + plat_data = (pdev->dev).platform_data; + + if (plat_data && plat_data->xcvr_enable) + plat_data->xcvr_enable(pdev->id, 0); + + if (flexcan->io_reg) + regulator_disable(flexcan->io_reg); + if (flexcan->core_reg) + regulator_disable(flexcan->core_reg); + if (flexcan->clk) + clk_disable(flexcan->clk); + if (plat_data && plat_data->inactive) + plat_data->inactive(pdev->id); + } + return 0; +} + +static int flexcan_resume(struct platform_device *pdev) +{ + struct net_device *net; + struct flexcan_device *flexcan; + struct flexcan_platform_data *plat_data; + net = (struct net_device *)dev_get_drvdata(&pdev->dev); + flexcan = netdev_priv(net); + + BUG_ON(!flexcan); + + if (!(net->flags & IFF_UP)) + return 0; + + if (flexcan->wakeup) + set_irq_wake(flexcan->irq, 0); + else { + plat_data = (pdev->dev).platform_data; + if (plat_data && plat_data->active) + plat_data->active(pdev->id); + + if (flexcan->clk) { + if (clk_enable(flexcan->clk)) + printk(KERN_ERR "%s:enable clock fail\n", + __func__); + } + + if (flexcan->core_reg) { + if (regulator_enable(flexcan->core_reg)) + printk(KERN_ERR "%s:enable core voltage\n", + __func__); + } + if (flexcan->io_reg) { + if (regulator_enable(flexcan->io_reg)) + printk(KERN_ERR "%s:enable io voltage\n", + __func__); + } + + if (plat_data && plat_data->xcvr_enable) + plat_data->xcvr_enable(pdev->id, 1); + } + return 0; +} + +static struct platform_driver flexcan_driver = { + .driver = { + .name = FLEXCAN_DEVICE_NAME, + }, + .probe = flexcan_probe, + .remove = flexcan_remove, + .suspend = flexcan_suspend, + .resume = flexcan_resume, +}; + +static __init int flexcan_init(void) +{ + pr_info("Freescale FlexCAN Driver \n"); + return platform_driver_register(&flexcan_driver); +} + +static __exit void flexcan_exit(void) +{ + return platform_driver_unregister(&flexcan_driver); +} + +module_init(flexcan_init); +module_exit(flexcan_exit); + +MODULE_LICENSE("GPL"); diff --git a/drivers/net/can/flexcan/flexcan.h b/drivers/net/can/flexcan/flexcan.h new file mode 100644 index 000000000000..51a800bd8e55 --- /dev/null +++ b/drivers/net/can/flexcan/flexcan.h @@ -0,0 +1,222 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file flexcan.h + * + * @brief FlexCan definitions. + * + * @ingroup can + */ + +#ifndef __CAN_FLEXCAN_H__ +#define __CAN_FLEXCAN_H__ + +#include <linux/list.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/clk.h> +#include <linux/can.h> +#include <linux/can/core.h> +#include <linux/can/error.h> + +#define FLEXCAN_DEVICE_NAME "FlexCAN" + +#define CAN_MB_RX_INACTIVE 0x0 +#define CAN_MB_RX_EMPTY 0x4 +#define CAN_MB_RX_FULL 0x2 +#define CAN_MB_RX_OVERRUN 0x6 +#define CAN_MB_RX_BUSY 0x1 + +#define CAN_MB_TX_INACTIVE 0x8 +#define CAN_MB_TX_ABORT 0x9 +#define CAN_MB_TX_ONCE 0xC +#define CAN_MB_TX_REMOTE 0xA + +struct can_hw_mb { + unsigned int mb_cs; + unsigned int mb_id; + unsigned char mb_data[8]; +}; + +#define MB_CS_CODE_OFFSET 24 +#define MB_CS_CODE_MASK (0xF << MB_CS_CODE_OFFSET) +#define MB_CS_SRR_OFFSET 22 +#define MB_CS_SRR_MASK (0x1 << MB_CS_SRR_OFFSET) +#define MB_CS_IDE_OFFSET 21 +#define MB_CS_IDE_MASK (0x1 << MB_CS_IDE_OFFSET) +#define MB_CS_RTR_OFFSET 20 +#define MB_CS_RTR_MASK (0x1 << MB_CS_RTR_OFFSET) +#define MB_CS_LENGTH_OFFSET 16 +#define MB_CS_LENGTH_MASK (0xF << MB_CS_LENGTH_OFFSET) +#define MB_CS_TIMESTAMP_OFFSET 0 +#define MB_CS_TIMESTAMP_MASK (0xFF << MB_CS_TIMESTAMP_OFFSET) + +#define CAN_HW_REG_MCR 0x00 +#define CAN_HW_REG_CTRL 0x04 +#define CAN_HW_REG_TIMER 0x08 +#define CAN_HW_REG_RXGMASK 0x10 +#define CAN_HW_REG_RX14MASK 0x14 +#define CAN_HW_REG_RX15MASK 0x18 +#define CAN_HW_REG_ECR 0x1C +#define CAN_HW_REG_ESR 0x20 +#define CAN_HW_REG_IMASK2 0x24 +#define CAN_HW_REG_IMASK1 0x28 +#define CAN_HW_REG_IFLAG2 0x2C +#define CAN_HW_REG_IFLAG1 0x30 + +#define CAN_MB_BASE 0x0080 +#define CAN_RXMASK_BASE 0x0880 +#define CAN_FIFO_BASE 0xE0 + +#define __MCR_MDIS (1 << 31) +#define __MCR_FRZ (1 << 30) +#define __MCR_FEN (1 << 29) +#define __MCR_HALT (1 << 28) +#define __MCR_NOTRDY (1 << 27) +#define __MCR_WAK_MSK (1 << 26) +#define __MCR_SOFT_RST (1 << 25) +#define __MCR_FRZ_ACK (1 << 24) +#define __MCR_SLF_WAK (1 << 22) +#define __MCR_WRN_EN (1 << 21) +#define __MCR_LPM_ACK (1 << 20) +#define __MCR_WAK_SRC (1 << 19) +#define __MCR_DOZE (1 << 18) +#define __MCR_SRX_DIS (1 << 17) +#define __MCR_BCC (1 << 16) +#define __MCR_LPRIO_EN (1 << 13) +#define __MCR_AEN (1 << 12) +#define __MCR_MAX_IDAM_OFFSET 8 +#define __MCR_MAX_IDAM_MASK (0x3 << __MCR_MAX_IDAM_OFFSET) +#define __MCR_MAX_IDAM_A (0x0 << __MCR_MAX_IDAM_OFFSET) +#define __MCR_MAX_IDAM_B (0x1 << __MCR_MAX_IDAM_OFFSET) +#define __MCR_MAX_IDAM_C (0x2 << __MCR_MAX_IDAM_OFFSET) +#define __MCR_MAX_IDAM_D (0x3 << __MCR_MAX_IDAM_OFFSET) +#define __MCR_MAX_MB_OFFSET 0 +#define __MCR_MAX_MB_MASK (0x3F) + +#define __CTRL_PRESDIV_OFFSET 24 +#define __CTRL_PRESDIV_MASK (0xFF << __CTRL_PRESDIV_OFFSET) +#define __CTRL_RJW_OFFSET 22 +#define __CTRL_RJW_MASK (0x3 << __CTRL_RJW_OFFSET) +#define __CTRL_PSEG1_OFFSET 19 +#define __CTRL_PSEG1_MASK (0x7 << __CTRL_PSEG1_OFFSET) +#define __CTRL_PSEG2_OFFSET 16 +#define __CTRL_PSEG2_MASK (0x7 << __CTRL_PSEG2_OFFSET) +#define __CTRL_BOFF_MSK (0x1 << 15) +#define __CTRL_ERR_MSK (0x1 << 14) +#define __CTRL_CLK_SRC (0x1 << 13) +#define __CTRL_LPB (0x1 << 12) +#define __CTRL_TWRN_MSK (0x1 << 11) +#define __CTRL_RWRN_MSK (0x1 << 10) +#define __CTRL_SMP (0x1 << 7) +#define __CTRL_BOFF_REC (0x1 << 6) +#define __CTRL_TSYN (0x1 << 5) +#define __CTRL_LBUF (0x1 << 4) +#define __CTRL_LOM (0x1 << 3) +#define __CTRL_PROPSEG_OFFSET 0 +#define __CTRL_PROPSEG_MASK (0x7) + +#define __ECR_TX_ERR_COUNTER(x) ((x) & 0xFF) +#define __ECR_RX_ERR_COUNTER(x) (((x) >> 8) & 0xFF) +#define __ECR_PASSIVE_THRESHOLD 128 +#define __ECR_ACTIVE_THRESHOLD 96 + +#define __ESR_TWRN_INT (0x1 << 17) +#define __ESR_RWRN_INT (0x1 << 16) +#define __ESR_BIT1_ERR (0x1 << 15) +#define __ESR_BIT0_ERR (0x1 << 14) +#define __ESR_ACK_ERR (0x1 << 13) +#define __ESR_CRC_ERR (0x1 << 12) +#define __ESR_FRM_ERR (0x1 << 11) +#define __ESR_STF_ERR (0x1 << 10) +#define __ESR_TX_WRN (0x1 << 9) +#define __ESR_RX_WRN (0x1 << 8) +#define __ESR_IDLE (0x1 << 7) +#define __ESR_TXRX (0x1 << 6) +#define __ESR_FLT_CONF_OFF 4 +#define __ESR_FLT_CONF_MASK (0x3 << __ESR_FLT_CONF_OFF) +#define __ESR_BOFF_INT (0x1 << 2) +#define __ESR_ERR_INT (0x1 << 1) +#define __ESR_WAK_INT (0x1) + +#define __ESR_INTERRUPTS (__ESR_WAK_INT | __ESR_ERR_INT | \ + __ESR_BOFF_INT | __ESR_TWRN_INT | \ + __ESR_RWRN_INT) + +#define __FIFO_OV_INT 0x0080 +#define __FIFO_WARN_INT 0x0040 +#define __FIFO_RDY_INT 0x0020 + +struct flexcan_device { + struct mutex mutex; + void *io_base; + struct can_hw_mb *hwmb; + unsigned int *rx_mask; + unsigned int xmit_mb; + unsigned int bitrate; + /* word 1 */ + unsigned int br_presdiv:8; + unsigned int br_rjw:2; + unsigned int br_propseg:3; + unsigned int br_pseg1:3; + unsigned int br_pseg2:3; + unsigned int maxmb:6; + unsigned int xmit_maxmb:6; + unsigned int wd1_resv:1; + + /* word 2 */ + unsigned int fifo:1; + unsigned int wakeup:1; + unsigned int srx_dis:1; + unsigned int wak_src:1; + unsigned int bcc:1; + unsigned int lprio:1; + unsigned int abort:1; + unsigned int br_clksrc:1; + unsigned int loopback:1; + unsigned int smp:1; + unsigned int boff_rec:1; + unsigned int tsyn:1; + unsigned int listen:1; + + unsigned int ext_msg:1; + unsigned int std_msg:1; + + struct timer_list timer; + struct platform_device *dev; + struct regulator *core_reg; + struct regulator *io_reg; + struct clk *clk; + int irq; +}; + +#define FLEXCAN_MAX_FIFO_MB 8 +#define FLEXCAN_MAX_MB 64 +#define FLEXCAN_MAX_PRESDIV 256 +#define FLEXCAN_MAX_RJW 4 +#define FLEXCAN_MAX_PSEG1 8 +#define FLEXCAN_MAX_PSEG2 8 +#define FLEXCAN_MAX_PROPSEG 8 +#define FLEXCAN_MAX_BITRATE 1000000 + +extern struct net_device *flexcan_device_alloc(struct platform_device *pdev, + void (*setup) (struct net_device + *dev)); +extern void flexcan_device_free(struct platform_device *pdev); + +extern void flexcan_mbm_init(struct flexcan_device *flexcan); +extern void flexcan_mbm_isr(struct net_device *dev); +extern int flexcan_mbm_xmit(struct flexcan_device *flexcan, + struct can_frame *frame); +#endif /* __CAN_FLEXCAN_H__ */ diff --git a/drivers/net/can/flexcan/mbm.c b/drivers/net/can/flexcan/mbm.c new file mode 100644 index 000000000000..c846d97daadb --- /dev/null +++ b/drivers/net/can/flexcan/mbm.c @@ -0,0 +1,361 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file mbm.c + * + * @brief Driver for Freescale CAN Controller FlexCAN. + * + * @ingroup can + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/platform_device.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include "flexcan.h" + +#define flexcan_swab32(x) \ + (((x) << 24) | ((x) >> 24) |\ + (((x) & (__u32)0x0000ff00UL) << 8) |\ + (((x) & (__u32)0x00ff0000UL) >> 8)) + +static inline void flexcan_memcpy(void *dst, void *src, int len) +{ + int i; + unsigned int *d = (unsigned int *)dst, *s = (unsigned int *)src; + len = (len + 3) >> 2; + for (i = 0; i < len; i++, s++, d++) + *d = flexcan_swab32(*s); +} + +static void flexcan_mb_bottom(struct net_device *dev, int index) +{ + struct flexcan_device *flexcan = netdev_priv(dev); + struct net_device_stats *stats = &dev->stats; + struct can_hw_mb *hwmb; + struct can_frame *frame; + struct sk_buff *skb; + unsigned int tmp; + + hwmb = flexcan->hwmb + index; + if (flexcan->fifo || (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) { + if ((hwmb->mb_cs & MB_CS_CODE_MASK) >> MB_CS_CODE_OFFSET == + CAN_MB_TX_ABORT) { + hwmb->mb_cs &= ~MB_CS_CODE_MASK; + hwmb->mb_cs |= CAN_MB_TX_INACTIVE << MB_CS_CODE_OFFSET; + } + + if (hwmb->mb_cs & (CAN_MB_TX_INACTIVE << MB_CS_CODE_OFFSET)) { + if (netif_queue_stopped(dev)) + netif_start_queue(dev); + return; + } + } + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (skb) { + frame = (struct can_frame *)skb_put(skb, sizeof(*frame)); + memset(frame, 0, sizeof(*frame)); + if (hwmb->mb_cs & MB_CS_IDE_MASK) + frame->can_id = + (hwmb->mb_id & CAN_EFF_MASK) | CAN_EFF_FLAG; + else + frame->can_id = (hwmb->mb_id >> 18) & CAN_SFF_MASK; + + if (hwmb->mb_cs & MB_CS_RTR_MASK) + frame->can_id |= CAN_RTR_FLAG; + + frame->can_dlc = + (hwmb->mb_cs & MB_CS_LENGTH_MASK) >> MB_CS_LENGTH_OFFSET; + + if (frame->can_dlc && frame->can_dlc) + flexcan_memcpy(frame->data, hwmb->mb_data, + frame->can_dlc); + + if (flexcan->fifo + || (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) { + hwmb->mb_cs &= ~MB_CS_CODE_MASK; + hwmb->mb_cs |= CAN_MB_TX_INACTIVE << MB_CS_CODE_OFFSET; + if (netif_queue_stopped(dev)) + netif_start_queue(dev); + } + + tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER); + + dev->last_rx = jiffies; + stats->rx_packets++; + stats->rx_bytes += frame->can_dlc; + + skb->dev = dev; + skb->protocol = __constant_htons(ETH_P_CAN); + skb->ip_summed = CHECKSUM_UNNECESSARY; + netif_rx(skb); + } else { + tmp = hwmb->mb_cs; + tmp = hwmb->mb_id; + tmp = hwmb->mb_data[0]; + if (flexcan->fifo + || (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) { + hwmb->mb_cs &= ~MB_CS_CODE_MASK; + hwmb->mb_cs |= CAN_MB_TX_INACTIVE << MB_CS_CODE_OFFSET; + if (netif_queue_stopped(dev)) + netif_start_queue(dev); + } + tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER); + stats->rx_dropped++; + } +} + +static void flexcan_fifo_isr(struct net_device *dev, unsigned int iflag1) +{ + struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL; + struct net_device_stats *stats = &dev->stats; + struct sk_buff *skb; + struct can_hw_mb *hwmb = flexcan->hwmb; + struct can_frame *frame; + unsigned int tmp; + + if (iflag1 & __FIFO_RDY_INT) { + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (skb) { + frame = + (struct can_frame *)skb_put(skb, sizeof(*frame)); + memset(frame, 0, sizeof(*frame)); + if (hwmb->mb_cs & MB_CS_IDE_MASK) + frame->can_id = + (hwmb->mb_id & CAN_EFF_MASK) | CAN_EFF_FLAG; + else + frame->can_id = + (hwmb->mb_id >> 18) & CAN_SFF_MASK; + + if (hwmb->mb_cs & MB_CS_RTR_MASK) + frame->can_id |= CAN_RTR_FLAG; + + frame->can_dlc = + (hwmb->mb_cs & MB_CS_LENGTH_MASK) >> + MB_CS_LENGTH_OFFSET; + + if (frame->can_dlc && (frame->can_dlc <= 8)) + flexcan_memcpy(frame->data, hwmb->mb_data, + frame->can_dlc); + tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER); + + dev->last_rx = jiffies; + + stats->rx_packets++; + stats->rx_bytes += frame->can_dlc; + + skb->dev = dev; + skb->protocol = __constant_htons(ETH_P_CAN); + skb->ip_summed = CHECKSUM_UNNECESSARY; + netif_rx(skb); + } else { + tmp = hwmb->mb_cs; + tmp = hwmb->mb_id; + tmp = hwmb->mb_data[0]; + tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER); + } + } + + if (iflag1 & (__FIFO_OV_INT | __FIFO_WARN_INT)) { + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (skb) { + frame = + (struct can_frame *)skb_put(skb, sizeof(*frame)); + memset(frame, 0, sizeof(*frame)); + frame->can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; + frame->can_dlc = CAN_ERR_DLC; + if (iflag1 & __FIFO_WARN_INT) + frame->data[1] |= + CAN_ERR_CRTL_TX_WARNING | + CAN_ERR_CRTL_RX_WARNING; + if (iflag1 & __FIFO_OV_INT) + frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW; + + skb->dev = dev; + skb->protocol = __constant_htons(ETH_P_CAN); + skb->ip_summed = CHECKSUM_UNNECESSARY; + netif_rx(skb); + } + } +} + +/*! + * @brief The function call by CAN ISR to handle mb events. + * + * @param dev the pointer of network device. + * + * @return none + */ +void flexcan_mbm_isr(struct net_device *dev) +{ + int i, iflag1, iflag2, maxmb; + struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL; + + if (flexcan->maxmb > 31) { + maxmb = flexcan->maxmb + 1 - 32; + iflag1 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG1) & + __raw_readl(flexcan->io_base + CAN_HW_REG_IMASK1); + iflag2 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG2) & + __raw_readl(flexcan->io_base + CAN_HW_REG_IMASK2); + iflag2 &= (1 << maxmb) - 1; + maxmb = 32; + } else { + maxmb = flexcan->maxmb + 1; + iflag1 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG1) & + __raw_readl(flexcan->io_base + CAN_HW_REG_IMASK1); + iflag1 &= (1 << maxmb) - 1; + iflag2 = 0; + } + + __raw_writel(iflag1, flexcan->io_base + CAN_HW_REG_IFLAG1); + __raw_writel(iflag2, flexcan->io_base + CAN_HW_REG_IFLAG2); + + if (flexcan->fifo) { + flexcan_fifo_isr(dev, iflag1); + iflag1 &= 0xFFFFFF00; + } + for (i = 0; iflag1 && (i < maxmb); i++) { + if (iflag1 & (1 << i)) { + iflag1 &= ~(1 << i); + flexcan_mb_bottom(dev, i); + } + } + + for (i = maxmb; iflag2 && (i <= flexcan->maxmb); i++) { + if (iflag2 & (1 << (i - 32))) { + iflag2 &= ~(1 << (i - 32)); + flexcan_mb_bottom(dev, i); + } + } +} + +/*! + * @brief function to xmit message buffer + * + * @param flexcan the pointer of can hardware device. + * @param frame the pointer of can message frame. + * + * @return Returns 0 if xmit is success. otherwise returns non-zero. + */ +int flexcan_mbm_xmit(struct flexcan_device *flexcan, struct can_frame *frame) +{ + int i = flexcan->xmit_mb; + struct can_hw_mb *hwmb = flexcan->hwmb; + + do { + if ((hwmb[i].mb_cs & MB_CS_CODE_MASK) >> MB_CS_CODE_OFFSET == + CAN_MB_TX_INACTIVE) + break; + if ((++i) > flexcan->maxmb) { + if (flexcan->fifo) + i = FLEXCAN_MAX_FIFO_MB; + else + i = flexcan->xmit_maxmb + 1; + } + if (i == flexcan->xmit_mb) + return -1; + } while (1); + + flexcan->xmit_mb = i + 1; + if (flexcan->xmit_mb > flexcan->maxmb) { + if (flexcan->fifo) + flexcan->xmit_mb = FLEXCAN_MAX_FIFO_MB; + else + flexcan->xmit_mb = flexcan->xmit_maxmb + 1; + } + + if (frame->can_id & CAN_RTR_FLAG) + hwmb[i].mb_cs |= 1 << MB_CS_RTR_OFFSET; + else + hwmb[i].mb_cs &= ~MB_CS_RTR_MASK; + + if (frame->can_id & CAN_EFF_FLAG) { + hwmb[i].mb_cs |= 1 << MB_CS_IDE_OFFSET; + hwmb[i].mb_cs |= 1 << MB_CS_SRR_OFFSET; + hwmb[i].mb_id = frame->can_id & CAN_EFF_MASK; + } else { + hwmb[i].mb_cs &= ~MB_CS_IDE_MASK; + hwmb[i].mb_id = (frame->can_id & CAN_SFF_MASK) << 18; + } + + hwmb[i].mb_cs &= ~MB_CS_LENGTH_MASK; + hwmb[i].mb_cs |= frame->can_dlc << MB_CS_LENGTH_OFFSET; + flexcan_memcpy(hwmb[i].mb_data, frame->data, frame->can_dlc); + hwmb[i].mb_cs &= ~MB_CS_CODE_MASK; + hwmb[i].mb_cs |= CAN_MB_TX_ONCE << MB_CS_CODE_OFFSET; + return 0; +} + +/*! + * @brief function to initial message buffer + * + * @param flexcan the pointer of can hardware device. + * + * @return none + */ +void flexcan_mbm_init(struct flexcan_device *flexcan) +{ + struct can_hw_mb *hwmb; + int rx_mb, i; + + /* Set global mask to receive all messages */ + __raw_writel(0, flexcan->io_base + CAN_HW_REG_RXGMASK); + __raw_writel(0, flexcan->io_base + CAN_HW_REG_RX14MASK); + __raw_writel(0, flexcan->io_base + CAN_HW_REG_RX15MASK); + + memset(flexcan->hwmb, 0, sizeof(*hwmb) * FLEXCAN_MAX_MB); + /* Set individual mask to receive all messages */ + memset(flexcan->rx_mask, 0, sizeof(unsigned int) * FLEXCAN_MAX_MB); + + if (flexcan->fifo) + rx_mb = FLEXCAN_MAX_FIFO_MB; + else + rx_mb = flexcan->maxmb - flexcan->xmit_maxmb; + + hwmb = flexcan->hwmb; + if (flexcan->fifo) { + unsigned long *id_table = flexcan->io_base + CAN_FIFO_BASE; + for (i = 0; i < rx_mb; i++) + id_table[i] = 0; + } else { + for (i = 0; i < rx_mb; i++) { + hwmb[i].mb_cs &= ~MB_CS_CODE_MASK; + hwmb[i].mb_cs |= CAN_MB_RX_EMPTY << MB_CS_CODE_OFFSET; + /* + * IDE bit can not control by mask registers + * So set message buffer to receive extend + * or standard message. + */ + if (flexcan->ext_msg && flexcan->std_msg) { + hwmb[i].mb_cs &= ~MB_CS_IDE_MASK; + hwmb[i].mb_cs |= (i & 1) << MB_CS_IDE_OFFSET; + } else { + if (flexcan->ext_msg) + hwmb[i].mb_cs |= 1 << MB_CS_IDE_OFFSET; + } + } + } + + for (; i <= flexcan->maxmb; i++) { + hwmb[i].mb_cs &= ~MB_CS_CODE_MASK; + hwmb[i].mb_cs |= CAN_MB_TX_INACTIVE << MB_CS_CODE_OFFSET; + } + + flexcan->xmit_mb = rx_mb; +} |