// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, MediaTek Inc.
* Copyright (c) 2021-2022, Intel Corporation.
*
* Authors:
* Amir Hanania <[email protected]>
* Haijun Liu <[email protected]>
* Moises Veleta <[email protected]>
* Ricardo Martinez <[email protected]>
*
* Contributors:
* Andy Shevchenko <[email protected]>
* Chandrashekar Devegowda <[email protected]>
* Chiranjeevi Rapolu <[email protected]>
* Eliot Lee <[email protected]>
* Sreehari Kancharla <[email protected]>
*/
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/wwan.h>
#include "t7xx_hif_cldma.h"
#include "t7xx_modem_ops.h"
#include "t7xx_port.h"
#include "t7xx_port_proxy.h"
#include "t7xx_state_monitor.h"
#define Q_IDX_CTRL 0
#define Q_IDX_MBIM 2
#define Q_IDX_AT_CMD 5
#define INVALID_SEQ_NUM GENMASK(15, 0)
#define for_each_proxy_port(i, p, proxy) \
for (i = 0, (p) = &(proxy)->ports[i]; \
i < (proxy)->port_count; \
i++, (p) = &(proxy)->ports[i])
#define T7XX_MAX_POSSIBLE_PORTS_NUM \
(max(ARRAY_SIZE(t7xx_port_conf), ARRAY_SIZE(t7xx_early_port_conf)))
static const struct t7xx_port_conf t7xx_port_conf[] = {
{
.tx_ch = PORT_CH_UART2_TX,
.rx_ch = PORT_CH_UART2_RX,
.txq_index = Q_IDX_AT_CMD,
.rxq_index = Q_IDX_AT_CMD,
.txq_exp_index = 0xff,
.rxq_exp_index = 0xff,
.path_id = CLDMA_ID_MD,
.ops = &wwan_sub_port_ops,
.name = "AT",
.port_type = WWAN_PORT_AT,
}, {
.tx_ch = PORT_CH_MBIM_TX,
.rx_ch = PORT_CH_MBIM_RX,
.txq_index = Q_IDX_MBIM,
.rxq_index = Q_IDX_MBIM,
.path_id = CLDMA_ID_MD,
.ops = &wwan_sub_port_ops,
.name = "MBIM",
.port_type = WWAN_PORT_MBIM,
}, {
#ifdef CONFIG_WWAN_DEBUGFS
.tx_ch = PORT_CH_MD_LOG_TX,
.rx_ch = PORT_CH_MD_LOG_RX,
.txq_index = 7,
.rxq_index = 7,
.txq_exp_index = 7,
.rxq_exp_index = 7,
.path_id = CLDMA_ID_MD,
.ops = &t7xx_trace_port_ops,
.name = "mdlog",
}, {
#endif
.tx_ch = PORT_CH_CONTROL_TX,
.rx_ch = PORT_CH_CONTROL_RX,
.txq_index = Q_IDX_CTRL,
.rxq_index = Q_IDX_CTRL,
.path_id = CLDMA_ID_MD,
.ops = &ctl_port_ops,
.name = "t7xx_ctrl",
}, {
.tx_ch = PORT_CH_AP_CONTROL_TX,
.rx_ch = PORT_CH_AP_CONTROL_RX,
.txq_index = Q_IDX_CTRL,
.rxq_index = Q_IDX_CTRL,
.path_id = CLDMA_ID_AP,
.ops = &ctl_port_ops,
.name = "t7xx_ap_ctrl",
},
};
static const struct t7xx_port_conf t7xx_early_port_conf[] = {
{
.tx_ch = PORT_CH_UNIMPORTANT,
.rx_ch = PORT_CH_UNIMPORTANT,
.txq_index = CLDMA_Q_IDX_DUMP,
.rxq_index = CLDMA_Q_IDX_DUMP,
.txq_exp_index = CLDMA_Q_IDX_DUMP,
.rxq_exp_index = CLDMA_Q_IDX_DUMP,
.path_id = CLDMA_ID_AP,
.ops = &wwan_sub_port_ops,
.name = "fastboot",
.port_type = WWAN_PORT_FASTBOOT,
},
};
static struct t7xx_port *t7xx_proxy_get_port_by_ch(struct port_proxy *port_prox, enum port_ch ch)
{
const struct t7xx_port_conf *port_conf;
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
port_conf = port->port_conf;
if (port_conf->rx_ch == ch || port_conf->tx_ch == ch)
return port;
}
return NULL;
}
static u16 t7xx_port_next_rx_seq_num(struct t7xx_port *port, struct ccci_header *ccci_h)
{
u32 status = le32_to_cpu(ccci_h->status);
u16 seq_num, next_seq_num;
bool assert_bit;
seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status);
next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD);
assert_bit = status & CCCI_H_AST_BIT;
if (!assert_bit || port->seq_nums[MTK_RX] == INVALID_SEQ_NUM)
return next_seq_num;
if (seq_num != port->seq_nums[MTK_RX])
dev_warn_ratelimited(port->dev,
"seq num out-of-order %u != %u (header %X, len %X)\n",
seq_num, port->seq_nums[MTK_RX],
le32_to_cpu(ccci_h->packet_header),
le32_to_cpu(ccci_h->packet_len));
return next_seq_num;
}
void t7xx_port_proxy_reset(struct port_proxy *port_prox)
{
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
port->seq_nums[MTK_TX] = 0;
}
}
static int t7xx_port_get_queue_no(struct t7xx_port *port)
{
const struct t7xx_port_conf *port_conf = port->port_conf;
struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
return t7xx_fsm_get_md_state(ctl) == MD_STATE_EXCEPTION ?
port_conf->txq_exp_index : port_conf->txq_index;
}
static void t7xx_port_struct_init(struct t7xx_port *port)
{
INIT_LIST_HEAD(&port->entry);
INIT_LIST_HEAD(&port->queue_entry);
skb_queue_head_init(&port->rx_skb_list);
init_waitqueue_head(&port->rx_wq);
port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
port->seq_nums[MTK_TX] = 0;
atomic_set(&port->usage_cnt, 0);
}
struct sk_buff *t7xx_port_alloc_skb(int payload)
{
struct sk_buff *skb = __dev_alloc_skb(payload + sizeof(struct ccci_header), GFP_KERNEL);
if (skb)
skb_reserve(skb, sizeof(struct ccci_header));
return skb;
}
struct sk_buff *t7xx_ctrl_alloc_skb(int payload)
{
struct sk_buff *skb = t7xx_port_alloc_skb(payload + sizeof(struct ctrl_msg_header));
if (skb)
skb_reserve(skb, sizeof(struct ctrl_msg_header));
return skb;
}
/**
* t7xx_port_enqueue_skb() - Enqueue the received skb into the port's rx_skb_list.
* @port: port context.
* @skb: received skb.
*
* Return:
* * 0 - Success.
* * -ENOBUFS - Not enough buffer space. Caller will try again later, skb is not consumed.
*/
int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb)
{
unsigned long flags;
spin_lock_irqsave(&port->rx_wq.lock, flags);
if (port->rx_skb_list.qlen >= port->rx_length_th) {
spin_unlock_irqrestore(&port->rx_wq.lock, flags);
return -ENOBUFS;
}
__skb_queue_tail(&port->rx_skb_list, skb);
spin_unlock_irqrestore(&port->rx_wq.lock, flags);
wake_up_all(&port->rx_wq);
return 0;
}
int t7xx_get_port_mtu(struct t7xx_port *port)
{
enum cldma_id path_id = port->port_conf->path_id;
int tx_qno = t7xx_port_get_queue_no(port);
struct cldma_ctrl *md_ctrl;
md_ctrl = port->t7xx_dev->md->md_ctrl[path_id];
return md_ctrl->tx_ring[tx_qno].pkt_size;
}
int t7xx_port_send_raw_skb(struct t7xx_port *port, struct sk_buff *skb)
{
enum cldma_id path_id = port->port_conf->path_id;
struct cldma_ctrl *md_ctrl;
int ret, tx_qno;
md_ctrl = port->t7xx_dev->md->md_ctrl[path_id];
tx_qno = t7xx_port_get_queue_no(port);
ret = t7xx_cldma_send_skb(md_ctrl, tx_qno, skb);
if (ret)
dev_err(port->dev, "Failed to send skb: %d\n", ret);
return ret;
}
static int t7xx_port_send_ccci_skb(struct t7xx_port *port, struct sk_buff *skb,
unsigned int pkt_header, unsigned int ex_msg)
{
const struct t7xx_port_conf *port_conf = port->port_conf;
struct ccci_header *ccci_h;
u32 status;
int ret;
ccci_h = skb_push(skb, sizeof(*ccci_h));
status = FIELD_PREP(CCCI_H_CHN_FLD, port_conf->tx_ch) |
FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT;
ccci_h->status = cpu_to_le32(status);
ccci_h->packet_header = cpu_to_le32(pkt_header);
ccci_h->packet_len = cpu_to_le32(skb->len);
ccci_h->ex_msg = cpu_to_le32(ex_msg);
ret = t7xx_port_send_raw_skb(port, skb);
if (ret)
return ret;
port->seq_nums[MTK_TX]++;
return 0;
}
int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg,
unsigned int ex_msg)
{
struct ctrl_msg_header *ctrl_msg_h;
unsigned int msg_len = skb->len;
u32 pkt_header = 0;
ctrl_msg_h = skb_push(skb, sizeof(*ctrl_msg_h));
ctrl_msg_h->ctrl_msg_id = cpu_to_le32(msg);
ctrl_msg_h->ex_msg = cpu_to_le32(ex_msg);
ctrl_msg_h->data_length = cpu_to_le32(msg_len);
if (!msg_len)
pkt_header = CCCI_HEADER_NO_DATA;
return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
}
int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
unsigned int ex_msg)
{
struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
unsigned int fsm_state;
fsm_state = t7xx_fsm_get_ctl_state(ctl);
if (fsm_state != FSM_STATE_PRE_START) {
const struct t7xx_port_conf *port_conf = port->port_conf;
enum md_state md_state = t7xx_fsm_get_md_state(ctl);
switch (md_state) {
case MD_STATE_EXCEPTION:
if (port_conf->tx_ch != PORT_CH_MD_LOG_TX)
return -EBUSY;
break;
case MD_STATE_WAITING_FOR_HS1:
case MD_STATE_WAITING_FOR_HS2:
case MD_STATE_STOPPED:
case MD_STATE_WAITING_TO_STOP:
case MD_STATE_INVALID:
return -ENODEV;
default:
break;
}
}
return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
}
static void t7xx_proxy_setup_ch_mapping(struct port_proxy *port_prox)
{
struct t7xx_port *port;
int i, j;
for (i = 0; i < ARRAY_SIZE(port_prox->rx_ch_ports); i++)
INIT_LIST_HEAD(&port_prox->rx_ch_ports[i]);
for (j = 0; j < ARRAY_SIZE(port_prox->queue_ports); j++) {
for (i = 0; i < ARRAY_SIZE(port_prox->queue_ports[j]); i++)
INIT_LIST_HEAD(&port_prox->queue_ports[j][i]);
}
for_each_proxy_port(i, port, port_prox) {
const struct t7xx_port_conf *port_conf = port->port_conf;
enum cldma_id path_id = port_conf->path_id;
u8 ch_id;
ch_id = FIELD_GET(PORT_CH_ID_MASK, port_conf->rx_ch);
list_add_tail(&port->entry, &port_prox->rx_ch_ports[ch_id]);
list_add_tail(&port->queue_entry,
&port_prox->queue_ports[path_id][port_conf->rxq_index]);
}
}
/**
* t7xx_port_proxy_recv_skb_from_dedicated_queue() - Dispatch early port received skb.
* @queue: CLDMA queue.
* @skb: Socket buffer.
*
* Return:
** 0 - Packet consumed.
** -ERROR - Failed to process skb.
*/
int t7xx_port_proxy_recv_skb_from_dedicated_queue(struct cldma_queue *queue, struct sk_buff *skb)
{
struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev;
struct port_proxy *port_prox = t7xx_dev->md->port_prox;
const struct t7xx_port_conf *port_conf;
struct t7xx_port *port;
int ret;
port = &port_prox->ports[0];
if (WARN_ON_ONCE(port->port_conf->rxq_index != queue->index)) {
dev_kfree_skb_any(skb);
return -EINVAL;
}
port_conf = port->port_conf;
ret = port_conf->ops->recv_skb(port, skb);
if (ret < 0 && ret != -ENOBUFS) {
dev_err(port->dev, "drop on RX ch %d, %d\n", port_conf->rx_ch, ret);
dev_kfree_skb_any(skb);
}
return ret;
}
static struct t7xx_port *t7xx_port_proxy_find_port(struct t7xx_pci_dev *t7xx_dev,
struct cldma_queue *queue, u16 channel)
{
struct port_proxy *port_prox = t7xx_dev->md->port_prox;
struct list_head *port_list;
struct t7xx_port *port;
u8 ch_id;
ch_id = FIELD_GET(PORT_CH_ID_MASK, channel);
port_list = &port_prox->rx_ch_ports[ch_id];
list_for_each_entry(port, port_list, entry) {
const struct t7xx_port_conf *port_conf = port->port_conf;
if (queue->md_ctrl->hif_id == port_conf->path_id &&
channel == port_conf->rx_ch)
return port;
}
return NULL;
}
/**
* t7xx_port_proxy_recv_skb() - Dispatch received skb.
* @queue: CLDMA queue.
* @skb: Socket buffer.
*
* Return:
** 0 - Packet consumed.
** -ERROR - Failed to process skb.
*/
int t7xx_port_proxy_recv_skb(struct cldma_queue *queue, struct sk_buff *skb)
{
struct ccci_header *ccci_h = (struct ccci_header *)skb->data;
struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev;
struct t7xx_fsm_ctl *ctl = t7xx_dev->md->fsm_ctl;
struct device *dev = queue->md_ctrl->dev;
const struct t7xx_port_conf *port_conf;
struct t7xx_port *port;
u16 seq_num, channel;
int ret;
channel = FIELD_GET(CCCI_H_CHN_FLD, le32_to_cpu(ccci_h->status));
if (t7xx_fsm_get_md_state(ctl) == MD_STATE_INVALID) {
dev_err_ratelimited(dev, "Packet drop on channel 0x%x, modem not ready\n", channel);
goto drop_skb;
}
port = t7xx_port_proxy_find_port(t7xx_dev, queue, channel);
if (!port) {
dev_err_ratelimited(dev, "Packet drop on channel 0x%x, port not found\n", channel);
goto drop_skb;
}
seq_num = t7xx_port_next_rx_seq_num(port, ccci_h);
port_conf = port->port_conf;
skb_pull(skb, sizeof(*ccci_h));
ret = port_conf->ops->recv_skb(port, skb);
/* Error indicates to try again later */
if (ret) {
skb_push(skb, sizeof(*ccci_h));
return ret;
}
port->seq_nums[MTK_RX] = seq_num;
return 0;
drop_skb:
dev_kfree_skb_any(skb);
return 0;
}
/**
* t7xx_port_proxy_md_status_notify() - Notify all ports of state.
*@port_prox: The port_proxy pointer.
*@state: State.
*
* Called by t7xx_fsm. Used to dispatch modem status for all ports,
* which want to know MD state transition.
*/
void t7xx_port_proxy_md_status_notify(struct port_proxy *port_prox, unsigned int state)
{
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
const struct t7xx_port_conf *port_conf = port->port_conf;
if (port_conf->ops->md_state_notify)
port_conf->ops->md_state_notify(port, state);
}
}
static void t7xx_proxy_init_all_ports(struct t7xx_modem *md)
{
struct port_proxy *port_prox = md->port_prox;
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
const struct t7xx_port_conf *port_conf = port->port_conf;
t7xx_port_struct_init(port);
if (port_conf->tx_ch == PORT_CH_CONTROL_TX)
md->core_md.ctl_port = port;
if (port_conf->tx_ch == PORT_CH_AP_CONTROL_TX)
md->core_ap.ctl_port = port;
port->t7xx_dev = md->t7xx_dev;
port->dev = &md->t7xx_dev->pdev->dev;
spin_lock_init(&port->port_update_lock);
port->chan_enable = false;
if (port_conf->ops && port_conf->ops->init)
port_conf->ops->init(port);
}
t7xx_proxy_setup_ch_mapping(port_prox);
}
void t7xx_port_proxy_set_cfg(struct t7xx_modem *md, enum port_cfg_id cfg_id)
{
struct port_proxy *port_prox = md->port_prox;
const struct t7xx_port_conf *port_conf;
u32 port_count;
int i;
t7xx_port_proxy_uninit(port_prox);
if (cfg_id == PORT_CFG_ID_EARLY) {
port_conf = t7xx_early_port_conf;
port_count = ARRAY_SIZE(t7xx_early_port_conf);
} else {
port_conf = t7xx_port_conf;
port_count = ARRAY_SIZE(t7xx_port_conf);
}
for (i = 0; i < port_count; i++)
port_prox->ports[i].port_conf = &port_conf[i];
port_prox->cfg_id = cfg_id;
port_prox->port_count = port_count;
t7xx_proxy_init_all_ports(md);
}
static int t7xx_proxy_alloc(struct t7xx_modem *md)
{
struct device *dev = &md->t7xx_dev->pdev->dev;
struct port_proxy *port_prox;
port_prox = devm_kzalloc(dev,
struct_size(port_prox,
ports,
T7XX_MAX_POSSIBLE_PORTS_NUM),
GFP_KERNEL);
if (!port_prox)
return -ENOMEM;
md->port_prox = port_prox;
port_prox->dev = dev;
return 0;
}
/**
* t7xx_port_proxy_init() - Initialize ports.
* @md: Modem.
*
* Create all port instances.
*
* Return:
* * 0 - Success.
* * -ERROR - Error code from failure sub-initializations.
*/
int t7xx_port_proxy_init(struct t7xx_modem *md)
{
int ret;
ret = t7xx_proxy_alloc(md);
if (ret)
return ret;
return 0;
}
void t7xx_port_proxy_uninit(struct port_proxy *port_prox)
{
struct t7xx_port *port;
int i;
for_each_proxy_port(i, port, port_prox) {
const struct t7xx_port_conf *port_conf = port->port_conf;
if (port_conf->ops && port_conf->ops->uninit)
port_conf->ops->uninit(port);
}
}
int t7xx_port_proxy_chl_enable_disable(struct port_proxy *port_prox, unsigned int ch_id,
bool en_flag)
{
struct t7xx_port *port = t7xx_proxy_get_port_by_ch(port_prox, ch_id);
const struct t7xx_port_conf *port_conf;
if (!port)
return -EINVAL;
port_conf = port->port_conf;
if (en_flag) {
if (port_conf->ops->enable_chl)
port_conf->ops->enable_chl(port);
} else {
if (port_conf->ops->disable_chl)
port_conf->ops->disable_chl(port);
}
return 0;
}
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