409 lines
10 KiB
C
409 lines
10 KiB
C
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/*
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* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Aapo Vienamo <avienamo@nvidia.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/atomic.h>
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#include <linux/debugfs.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <soc/tegra/tegra_bpmp.h>
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#include <soc/tegra/bpmp_abi.h>
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#include "bpmp.h"
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static struct bpmp_tty_buffer {
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void __iomem *bpmp_tx_buf;
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void __iomem *bpmp_tx_head;
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void __iomem *bpmp_tx_tail;
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uint32_t bpmp_tx_buf_sz;
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uint32_t bpmp_rx_space_avail;
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} bpmp_tty_buffer;
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struct bpmp_tty_priv {
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struct delayed_work poll_work;
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struct tty_port port;
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};
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static atomic_t bpmp_tty_num_readers = ATOMIC_INIT(0);
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static bool write_enable;
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static void bpmp_tty_poll_worker(struct work_struct *work)
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{
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struct mrq_ringbuf_console_host_to_bpmp_request req;
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union mrq_ringbuf_console_bpmp_to_host_response resp;
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struct bpmp_tty_priv *priv =
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container_of(work, struct bpmp_tty_priv,
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poll_work.work);
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int ret = 0;
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do {
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req.type = CMD_RINGBUF_CONSOLE_READ;
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req.read.len = sizeof(resp.read.data);
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ret = tegra_bpmp_send_receive(MRQ_RINGBUF_CONSOLE, &req,
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sizeof(req), &resp, sizeof(resp));
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if (ret < 0) {
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schedule_delayed_work(&priv->poll_work,
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msecs_to_jiffies(100));
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return;
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}
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if (resp.read.len) {
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tty_insert_flip_string(&priv->port, resp.read.data,
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resp.read.len);
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tty_flip_buffer_push(&priv->port);
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}
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} while (resp.read.len);
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schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(100));
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}
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static int bpmp_tty_mrq_cmd_abi_query(uint32_t cmd)
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{
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struct mrq_ringbuf_console_host_to_bpmp_request req;
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union mrq_ringbuf_console_bpmp_to_host_response resp;
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req.type = CMD_RINGBUF_CONSOLE_QUERY_ABI;
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req.query_abi.cmd = cmd;
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return tegra_bpmp_send_receive(MRQ_RINGBUF_CONSOLE, &req, sizeof(req),
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&resp, sizeof(resp));
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}
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static int bpmp_tty_write_msg(const unsigned char *data, uint32_t len)
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{
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struct mrq_ringbuf_console_host_to_bpmp_request req;
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union mrq_ringbuf_console_bpmp_to_host_response resp;
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int ret;
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if (!write_enable)
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return -ENODEV;
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req.type = CMD_RINGBUF_CONSOLE_WRITE;
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req.write.len = min_t(size_t, len, sizeof(req.write.data));
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memcpy(req.write.data, data, req.write.len);
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ret = tegra_bpmp_send_receive(MRQ_RINGBUF_CONSOLE, &req, sizeof(req),
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&resp, sizeof(resp));
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if (ret)
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return ret;
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bpmp_tty_buffer.bpmp_rx_space_avail =
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resp.write.space_avail;
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return resp.write.len;
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}
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static int bpmp_tty_mrq_abi_probe(void)
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{
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struct mrq_query_abi_request req;
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struct mrq_query_abi_response resp;
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int ret;
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req.mrq = MRQ_RINGBUF_CONSOLE;
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ret = tegra_bpmp_send_receive(MRQ_QUERY_ABI, &req, sizeof(req),
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&resp, sizeof(resp));
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if (ret < 0)
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return ret;
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if (resp.status == -BPMP_ENODEV)
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return -ENODEV;
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return 0;
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}
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static int bpmp_tty_install(struct tty_driver *drv, struct tty_struct *tty)
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{
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struct bpmp_tty_priv *priv;
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int ret;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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tty_port_init(&priv->port);
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tty->driver_data = priv;
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INIT_DELAYED_WORK(&priv->poll_work,
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bpmp_tty_poll_worker);
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ret = tty_port_install(&priv->port, drv, tty);
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if (ret)
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kfree(priv);
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return ret;
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}
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static void bpmp_tty_cleanup(struct tty_struct *tty)
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{
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struct bpmp_tty_priv *priv = tty->driver_data;
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tty->driver_data = NULL;
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tty_port_destroy(&priv->port);
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kfree(priv);
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}
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static int bpmp_tty_open(struct tty_struct *tty, struct file *file)
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{
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struct bpmp_tty_priv *priv = tty->driver_data;
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tty_port_tty_set(&priv->port, tty);
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if (atomic_inc_return(&bpmp_tty_num_readers) == 1)
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schedule_delayed_work(&priv->poll_work, HZ);
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return 0;
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}
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static void bpmp_tty_close(struct tty_struct *tty, struct file *file)
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{
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struct bpmp_tty_priv *priv = tty->driver_data;
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if (atomic_dec_return(&bpmp_tty_num_readers) == 0)
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cancel_delayed_work_sync(&priv->poll_work);
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tty_port_tty_set(&priv->port, NULL);
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}
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static int bpmp_tty_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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int tx_count = 0;
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int ret;
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while (tx_count < count) {
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ret = bpmp_tty_write_msg(buf + tx_count, count - tx_count);
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if (ret < 0)
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return ret;
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tx_count += ret;
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}
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return tx_count;
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}
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static int bpmp_tty_write_room(struct tty_struct *tty)
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{
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unsigned char dummy;
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int ret;
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if (bpmp_tty_buffer.bpmp_rx_space_avail == 0) {
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/* Update the BPMP RX buffer status. */
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ret = bpmp_tty_write_msg(&dummy, 0);
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if (ret < 0)
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return ret;
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}
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return bpmp_tty_buffer.bpmp_rx_space_avail;
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}
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static const struct tty_operations bpmp_tty_ops = {
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.install = bpmp_tty_install,
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.cleanup = bpmp_tty_cleanup,
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.write_room = bpmp_tty_write_room,
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.open = bpmp_tty_open,
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.close = bpmp_tty_close,
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.write = bpmp_tty_write,
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};
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static struct ktermios bpmp_tty_termios = {
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.c_iflag = IXON,
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.c_oflag = OPOST | CRDLY,
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.c_cflag = B115200 | CS8 | CREAD | HUPCL,
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.c_lflag = 0,
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.c_cc = INIT_C_CC,
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.c_ispeed = 115200,
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.c_ospeed = 115200,
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};
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struct bpmp_tty_drvdata {
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struct dentry *debugfs_dump_entry;
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struct tty_driver *tty_driver;
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};
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#ifdef CONFIG_DEBUG_FS
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static int bpmp_tty_debug_dump(struct seq_file *s, void *unused)
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{
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struct bpmp_tty_buffer *buffer = &bpmp_tty_buffer;
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uint32_t i, len, start;
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size_t off;
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start = ioread32(buffer->bpmp_tx_tail);
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len = (ioread32(buffer->bpmp_tx_head) - start) % buffer->bpmp_tx_buf_sz;
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for (i = 0; i < len; ++i) {
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off = (start + i) % buffer->bpmp_tx_buf_sz;
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seq_putc(s, ioread8(buffer->bpmp_tx_buf + off));
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}
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return 0;
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}
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static int bpmp_tty_debug_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bpmp_tty_debug_dump, inode->i_private);
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}
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static const struct file_operations bpmp_tty_dump_fops = {
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.open = bpmp_tty_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int bpmp_tty_get_fifo(struct platform_device *pdev)
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{
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struct bpmp_tty_buffer *buffer = &bpmp_tty_buffer;
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struct mrq_ringbuf_console_host_to_bpmp_request req;
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union mrq_ringbuf_console_bpmp_to_host_response resp;
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int ret;
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req.type = CMD_RINGBUF_CONSOLE_GET_FIFO;
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ret = tegra_bpmp_send_receive(MRQ_RINGBUF_CONSOLE, &req, sizeof(req),
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&resp, sizeof(resp));
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if (ret)
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return ret;
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buffer->bpmp_tx_buf = devm_ioremap(&pdev->dev,
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resp.get_fifo.bpmp_tx_buf_addr,
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resp.get_fifo.bpmp_tx_buf_len);
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if (IS_ERR(buffer->bpmp_tx_buf))
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return PTR_ERR(buffer->bpmp_tx_buf);
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buffer->bpmp_tx_head = devm_ioremap(&pdev->dev,
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resp.get_fifo.bpmp_tx_head_addr,
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sizeof(uint64_t));
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if (IS_ERR(buffer->bpmp_tx_head))
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return PTR_ERR(buffer->bpmp_tx_head);
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buffer->bpmp_tx_tail = devm_ioremap(&pdev->dev,
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resp.get_fifo.bpmp_tx_tail_addr,
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sizeof(uint64_t));
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if (IS_ERR(buffer->bpmp_tx_tail))
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return PTR_ERR(buffer->bpmp_tx_tail);
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buffer->bpmp_tx_buf_sz = resp.get_fifo.bpmp_tx_buf_len;
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return 0;
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}
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static void bpmp_tty_create_debugfs(struct platform_device *pdev,
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struct dentry *root)
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{
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struct bpmp_tty_drvdata *drvdata = platform_get_drvdata(pdev);
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int err;
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err = bpmp_tty_mrq_cmd_abi_query(CMD_RINGBUF_CONSOLE_GET_FIFO);
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if (err)
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return;
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err = bpmp_tty_get_fifo(pdev);
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if (err)
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return;
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drvdata->debugfs_dump_entry =
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debugfs_create_file("ttyBPMP", 0444, root, NULL,
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&bpmp_tty_dump_fops);
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if (IS_ERR_OR_NULL(drvdata->debugfs_dump_entry))
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dev_warn(&pdev->dev,
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"failed to create a debugfs entry: %ld\n",
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PTR_ERR(drvdata->debugfs_dump_entry));
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}
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static void bpmp_tty_remove_debugfs(struct bpmp_tty_drvdata *drvdata)
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{
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debugfs_remove(drvdata->debugfs_dump_entry);
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}
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#else
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static void bpmp_tty_create_debugfs(struct platform_device *pdev,
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struct dentry *root) {}
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static void bpmp_tty_remove_debugfs(struct bpmp_tty_drvdata *drvdata) {}
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#endif
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static int bpmp_tty_probe(struct platform_device *pdev)
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{
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struct bpmp_tty_drvdata *drvdata;
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struct dentry *root;
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int ret;
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ret = bpmp_tty_mrq_abi_probe();
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if (ret < 0)
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return ret;
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ret = bpmp_tty_mrq_cmd_abi_query(CMD_RINGBUF_CONSOLE_WRITE);
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if (ret == 0)
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write_enable = true;
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drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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platform_set_drvdata(pdev, drvdata);
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drvdata->tty_driver = tty_alloc_driver(1, 0);
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if (!drvdata->tty_driver)
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return -ENOMEM;
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drvdata->tty_driver->owner = THIS_MODULE;
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drvdata->tty_driver->driver_name = "ttyBPMP";
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drvdata->tty_driver->name = "ttyBPMP";
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drvdata->tty_driver->major = 0;
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drvdata->tty_driver->minor_start = 0;
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drvdata->tty_driver->init_termios = bpmp_tty_termios;
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drvdata->tty_driver->subtype = SERIAL_TYPE_NORMAL;
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drvdata->tty_driver->flags = TTY_DRIVER_REAL_RAW;
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drvdata->tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
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|
||
|
|
tty_set_operations(drvdata->tty_driver, &bpmp_tty_ops);
|
||
|
|
|
||
|
|
ret = tty_register_driver(drvdata->tty_driver);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&pdev->dev, "failed to register tty driver\n");
|
||
|
|
goto err_put_tty_driver;
|
||
|
|
}
|
||
|
|
|
||
|
|
root = pdev->dev.platform_data;
|
||
|
|
|
||
|
|
if (root)
|
||
|
|
bpmp_tty_create_debugfs(pdev, root);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_put_tty_driver:
|
||
|
|
put_tty_driver(drvdata->tty_driver);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bpmp_tty_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct bpmp_tty_drvdata *drvdata =
|
||
|
|
platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
bpmp_tty_remove_debugfs(drvdata);
|
||
|
|
tty_unregister_driver(drvdata->tty_driver);
|
||
|
|
put_tty_driver(drvdata->tty_driver);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver bpmp_tty_driver = {
|
||
|
|
.probe = bpmp_tty_probe,
|
||
|
|
.remove = bpmp_tty_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "tegra-bpmp-tty",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(bpmp_tty_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Aapo Vienamo <avienamo@nvidia.com>");
|
||
|
|
MODULE_DESCRIPTION("NVIDIA Tegra BPMP ring buffer console driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|