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Merge "can: bitrate setting for RH850" into dev/msm-4.4-8996au

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Srivatsa Vaddagiri 2017-03-23 05:23:13 -07:00 • committed by Gerrit - the friendly Code Review server
commit e4b8f93b84
1 changed files with 63 additions and 7 deletions
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70
drivers/net/can/spi/rh850.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -33,7 +33,7 @@
#define MAX_TX_BUFFERS 1
#define XFER_BUFFER_SIZE 64
#define RX_ASSEMBLY_BUFFER_SIZE 128
#define RH850_CLOCK 80000000
#define RH850_CLOCK 16000000
#define RH850_MAX_CHANNELS 4
struct rh850_can {
@ -84,6 +84,7 @@ struct spi_miso { /* TLV for MISO line */
#define CMD_CAN_ADD_FILTER 0x83
#define CMD_CAN_REMOVE_FILTER 0x84
#define CMD_CAN_RECEIVE_FRAME 0x85
#define CMD_CAN_CONFIG_BIT_TIMING 0x86
struct can_fw_resp {
u8 maj;
@ -126,15 +127,23 @@ struct can_receive_frame {
u8 data[];
} __packed;
struct can_config_bit_timing {
u8 can_if;
u32 brp;
u32 tseg1;
u32 tseg2;
u32 sjw;
} __packed;
static struct can_bittiming_const rh850_bittiming_const = {
.name = "rh850",
.tseg1_min = 4,
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 2,
.tseg2_max = 8,
.tseg2_min = 1,
.tseg2_max = 16,
.sjw_max = 4,
.brp_min = 4,
.brp_max = 1023,
.brp_min = 1,
.brp_max = 70,
.brp_inc = 1,
};
@ -347,6 +356,52 @@ static int rh850_query_firmware_version(struct rh850_can *priv_data)
return ret;
}
static int rh850_set_bitrate(struct net_device *netdev)
{
char *tx_buf, *rx_buf;
int ret;
struct spi_mosi *req;
struct can_config_bit_timing *req_d;
struct rh850_can *priv_data;
struct can_priv *priv = netdev_priv(netdev);
struct rh850_netdev_privdata *rh850_priv;
rh850_priv = netdev_priv(netdev);
priv_data = rh850_priv->rh850_can;
netdev_info(netdev, "ch%i, bitrate setting>%i",
rh850_priv->netdev_index, priv->bittiming.bitrate);
LOGNI("sjw>%i brp>%i ph_sg1>%i ph_sg2>%i smpl_pt>%i tq>%i pr_seg>%i",
priv->bittiming.sjw, priv->bittiming.brp,
priv->bittiming.phase_seg1,
priv->bittiming.phase_seg2,
priv->bittiming.sample_point,
priv->bittiming.tq, priv->bittiming.prop_seg);
mutex_lock(&priv_data->spi_lock);
tx_buf = priv_data->tx_buf;
rx_buf = priv_data->rx_buf;
memset(tx_buf, 0, XFER_BUFFER_SIZE);
memset(rx_buf, 0, XFER_BUFFER_SIZE);
priv_data->xfer_length = XFER_BUFFER_SIZE;
req = (struct spi_mosi *)tx_buf;
req->cmd = CMD_CAN_CONFIG_BIT_TIMING;
req->len = sizeof(struct can_config_bit_timing);
req->seq = atomic_inc_return(&priv_data->msg_seq);
req_d = (struct can_config_bit_timing *)req->data;
req_d->can_if = rh850_priv->netdev_index;
req_d->brp = priv->bittiming.brp;
req_d->tseg1 = priv->bittiming.phase_seg1 + priv->bittiming.prop_seg;
req_d->tseg2 = priv->bittiming.phase_seg2;
req_d->sjw = priv->bittiming.sjw;
ret = rh850_do_spi_transaction(priv_data);
mutex_unlock(&priv_data->spi_lock);
return ret;
}
static int rh850_can_write(struct rh850_can *priv_data,
int can_channel, struct can_frame *cf)
{
@ -493,6 +548,7 @@ static int rh850_create_netdev(struct spi_device *spi,
CAN_CTRLMODE_LISTENONLY;
netdev_priv_data->can.bittiming_const = &rh850_bittiming_const;
netdev_priv_data->can.clock.freq = RH850_CLOCK;
netdev_priv_data->can.do_set_bittiming = rh850_set_bitrate;
return 0;
}