--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <haijun.liu@mediatek.com>
+ * Moises Veleta <moises.veleta@intel.com>
+ * Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ *
+ * Contributors:
+ * Amir Hanania <amir.hanania@intel.com>
+ * Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ * Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
+ * Eliot Lee <eliot.lee@intel.com>
+ */
+
+#ifndef __T7XX_PORT_H__
+#define __T7XX_PORT_H__
+
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/wwan.h>
+
+#include "t7xx_hif_cldma.h"
+#include "t7xx_pci.h"
+
+#define PORT_CH_ID_MASK GENMASK(7, 0)
+
+/* Channel ID and Message ID definitions.
+ * The channel number consists of peer_id(15:12) , channel_id(11:0)
+ * peer_id:
+ * 0:reserved, 1: to sAP, 2: to MD
+ */
+enum port_ch {
+ /* to MD */
+ PORT_CH_CONTROL_RX = 0x2000,
+ PORT_CH_CONTROL_TX = 0x2001,
+ PORT_CH_UART1_RX = 0x2006, /* META */
+ PORT_CH_UART1_TX = 0x2008,
+ PORT_CH_UART2_RX = 0x200a, /* AT */
+ PORT_CH_UART2_TX = 0x200c,
+ PORT_CH_MD_LOG_RX = 0x202a, /* MD logging */
+ PORT_CH_MD_LOG_TX = 0x202b,
+ PORT_CH_LB_IT_RX = 0x203e, /* Loop back test */
+ PORT_CH_LB_IT_TX = 0x203f,
+ PORT_CH_STATUS_RX = 0x2043, /* Status events */
+ PORT_CH_MIPC_RX = 0x20ce, /* MIPC */
+ PORT_CH_MIPC_TX = 0x20cf,
+ PORT_CH_MBIM_RX = 0x20d0,
+ PORT_CH_MBIM_TX = 0x20d1,
+ PORT_CH_DSS0_RX = 0x20d2,
+ PORT_CH_DSS0_TX = 0x20d3,
+ PORT_CH_DSS1_RX = 0x20d4,
+ PORT_CH_DSS1_TX = 0x20d5,
+ PORT_CH_DSS2_RX = 0x20d6,
+ PORT_CH_DSS2_TX = 0x20d7,
+ PORT_CH_DSS3_RX = 0x20d8,
+ PORT_CH_DSS3_TX = 0x20d9,
+ PORT_CH_DSS4_RX = 0x20da,
+ PORT_CH_DSS4_TX = 0x20db,
+ PORT_CH_DSS5_RX = 0x20dc,
+ PORT_CH_DSS5_TX = 0x20dd,
+ PORT_CH_DSS6_RX = 0x20de,
+ PORT_CH_DSS6_TX = 0x20df,
+ PORT_CH_DSS7_RX = 0x20e0,
+ PORT_CH_DSS7_TX = 0x20e1,
+};
+
+struct t7xx_port;
+struct port_ops {
+ int (*init)(struct t7xx_port *port);
+ int (*recv_skb)(struct t7xx_port *port, struct sk_buff *skb);
+ void (*md_state_notify)(struct t7xx_port *port, unsigned int md_state);
+ void (*uninit)(struct t7xx_port *port);
+ int (*enable_chl)(struct t7xx_port *port);
+ int (*disable_chl)(struct t7xx_port *port);
+};
+
+struct t7xx_port_conf {
+ enum port_ch tx_ch;
+ enum port_ch rx_ch;
+ unsigned char txq_index;
+ unsigned char rxq_index;
+ unsigned char txq_exp_index;
+ unsigned char rxq_exp_index;
+ enum cldma_id path_id;
+ struct port_ops *ops;
+ char *name;
+ enum wwan_port_type port_type;
+};
+
+struct t7xx_port {
+ /* Members not initialized in definition */
+ const struct t7xx_port_conf *port_conf;
+ struct wwan_port *wwan_port;
+ struct t7xx_pci_dev *t7xx_dev;
+ struct device *dev;
+ u16 seq_nums[2]; /* TX/RX sequence numbers */
+ atomic_t usage_cnt;
+ struct list_head entry;
+ struct list_head queue_entry;
+ /* TX and RX flows are asymmetric since ports are multiplexed on
+ * queues.
+ *
+ * TX: data blocks are sent directly to a queue. Each port
+ * does not maintain a TX list; instead, they only provide
+ * a wait_queue_head for blocking writes.
+ *
+ * RX: Each port uses a RX list to hold packets,
+ * allowing the modem to dispatch RX packet as quickly as possible.
+ */
+ struct sk_buff_head rx_skb_list;
+ spinlock_t port_update_lock; /* Protects port configuration */
+ wait_queue_head_t rx_wq;
+ int rx_length_th;
+ bool chan_enable;
+ struct task_struct *thread;
+};
+
+struct sk_buff *t7xx_port_alloc_skb(int payload);
+int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb);
+int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
+ unsigned int ex_msg);
+
+#endif /* __T7XX_PORT_H__ */
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <amir.hanania@intel.com>
+ * Haijun Liu <haijun.liu@mediatek.com>
+ * Moises Veleta <moises.veleta@intel.com>
+ * Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ *
+ * Contributors:
+ * Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ * Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
+ * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ * Eliot Lee <eliot.lee@intel.com>
+ * Sreehari Kancharla <sreehari.kancharla@intel.com>
+ */
+
+#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])
+
+static const struct t7xx_port_conf t7xx_md_port_conf[] = {
+};
+
+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;
+}
+
+/**
+ * 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;
+}
+
+static 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_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]);
+ }
+}
+
+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.
+ */
+static 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;
+
+ if (!skb)
+ return -EINVAL;
+
+ 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);
+
+ 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->init)
+ port_conf->ops->init(port);
+ }
+
+ t7xx_proxy_setup_ch_mapping(port_prox);
+}
+
+static int t7xx_proxy_alloc(struct t7xx_modem *md)
+{
+ unsigned int port_count = ARRAY_SIZE(t7xx_md_port_conf);
+ struct device *dev = &md->t7xx_dev->pdev->dev;
+ struct port_proxy *port_prox;
+ int i;
+
+ port_prox = devm_kzalloc(dev, sizeof(*port_prox) + sizeof(struct t7xx_port) * port_count,
+ GFP_KERNEL);
+ if (!port_prox)
+ return -ENOMEM;
+
+ md->port_prox = port_prox;
+ port_prox->dev = dev;
+
+ for (i = 0; i < port_count; i++)
+ port_prox->ports[i].port_conf = &t7xx_md_port_conf[i];
+
+ port_prox->port_count = port_count;
+ t7xx_proxy_init_all_ports(md);
+ 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;
+
+ t7xx_cldma_set_recv_skb(md->md_ctrl[CLDMA_ID_MD], t7xx_port_proxy_recv_skb);
+ 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->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;
+}
projects / platform / kernel / linux-starfive.git / commitdiff