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298 lines
6.9 KiB
298 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. |
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*/ |
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#include <linux/console.h> |
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#include <linux/mailbox_client.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/serial.h> |
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#include <linux/serial_core.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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#define TCU_MBOX_BYTE(i, x) ((x) << (i * 8)) |
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#define TCU_MBOX_BYTE_V(x, i) (((x) >> (i * 8)) & 0xff) |
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#define TCU_MBOX_NUM_BYTES(x) ((x) << 24) |
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#define TCU_MBOX_NUM_BYTES_V(x) (((x) >> 24) & 0x3) |
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struct tegra_tcu { |
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struct uart_driver driver; |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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struct console console; |
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#endif |
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struct uart_port port; |
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struct mbox_client tx_client, rx_client; |
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struct mbox_chan *tx, *rx; |
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}; |
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static unsigned int tegra_tcu_uart_tx_empty(struct uart_port *port) |
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{ |
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return TIOCSER_TEMT; |
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} |
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static void tegra_tcu_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
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{ |
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} |
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static unsigned int tegra_tcu_uart_get_mctrl(struct uart_port *port) |
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{ |
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return 0; |
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} |
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static void tegra_tcu_uart_stop_tx(struct uart_port *port) |
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{ |
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} |
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static void tegra_tcu_write_one(struct tegra_tcu *tcu, u32 value, |
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unsigned int count) |
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{ |
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void *msg; |
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value |= TCU_MBOX_NUM_BYTES(count); |
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msg = (void *)(unsigned long)value; |
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mbox_send_message(tcu->tx, msg); |
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mbox_flush(tcu->tx, 1000); |
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} |
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static void tegra_tcu_write(struct tegra_tcu *tcu, const char *s, |
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unsigned int count) |
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{ |
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unsigned int written = 0, i = 0; |
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bool insert_nl = false; |
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u32 value = 0; |
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while (i < count) { |
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if (insert_nl) { |
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value |= TCU_MBOX_BYTE(written++, '\n'); |
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insert_nl = false; |
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i++; |
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} else if (s[i] == '\n') { |
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value |= TCU_MBOX_BYTE(written++, '\r'); |
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insert_nl = true; |
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} else { |
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value |= TCU_MBOX_BYTE(written++, s[i++]); |
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} |
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if (written == 3) { |
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tegra_tcu_write_one(tcu, value, 3); |
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value = written = 0; |
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} |
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} |
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if (written) |
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tegra_tcu_write_one(tcu, value, written); |
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} |
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static void tegra_tcu_uart_start_tx(struct uart_port *port) |
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{ |
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struct tegra_tcu *tcu = port->private_data; |
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struct circ_buf *xmit = &port->state->xmit; |
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unsigned long count; |
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for (;;) { |
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count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); |
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if (!count) |
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break; |
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tegra_tcu_write(tcu, &xmit->buf[xmit->tail], count); |
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xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); |
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} |
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uart_write_wakeup(port); |
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} |
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static void tegra_tcu_uart_stop_rx(struct uart_port *port) |
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{ |
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} |
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static void tegra_tcu_uart_break_ctl(struct uart_port *port, int ctl) |
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{ |
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} |
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static int tegra_tcu_uart_startup(struct uart_port *port) |
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{ |
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return 0; |
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} |
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static void tegra_tcu_uart_shutdown(struct uart_port *port) |
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{ |
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} |
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static void tegra_tcu_uart_set_termios(struct uart_port *port, |
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struct ktermios *new, |
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struct ktermios *old) |
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{ |
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} |
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static const struct uart_ops tegra_tcu_uart_ops = { |
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.tx_empty = tegra_tcu_uart_tx_empty, |
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.set_mctrl = tegra_tcu_uart_set_mctrl, |
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.get_mctrl = tegra_tcu_uart_get_mctrl, |
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.stop_tx = tegra_tcu_uart_stop_tx, |
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.start_tx = tegra_tcu_uart_start_tx, |
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.stop_rx = tegra_tcu_uart_stop_rx, |
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.break_ctl = tegra_tcu_uart_break_ctl, |
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.startup = tegra_tcu_uart_startup, |
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.shutdown = tegra_tcu_uart_shutdown, |
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.set_termios = tegra_tcu_uart_set_termios, |
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}; |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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static void tegra_tcu_console_write(struct console *cons, const char *s, |
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unsigned int count) |
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{ |
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struct tegra_tcu *tcu = container_of(cons, struct tegra_tcu, console); |
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tegra_tcu_write(tcu, s, count); |
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} |
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static int tegra_tcu_console_setup(struct console *cons, char *options) |
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{ |
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return 0; |
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} |
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#endif |
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static void tegra_tcu_receive(struct mbox_client *cl, void *msg) |
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{ |
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struct tegra_tcu *tcu = container_of(cl, struct tegra_tcu, rx_client); |
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struct tty_port *port = &tcu->port.state->port; |
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u32 value = (u32)(unsigned long)msg; |
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unsigned int num_bytes, i; |
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num_bytes = TCU_MBOX_NUM_BYTES_V(value); |
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for (i = 0; i < num_bytes; i++) |
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tty_insert_flip_char(port, TCU_MBOX_BYTE_V(value, i), |
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TTY_NORMAL); |
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tty_flip_buffer_push(port); |
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} |
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static int tegra_tcu_probe(struct platform_device *pdev) |
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{ |
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struct uart_port *port; |
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struct tegra_tcu *tcu; |
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int err; |
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tcu = devm_kzalloc(&pdev->dev, sizeof(*tcu), GFP_KERNEL); |
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if (!tcu) |
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return -ENOMEM; |
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tcu->tx_client.dev = &pdev->dev; |
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tcu->rx_client.dev = &pdev->dev; |
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tcu->rx_client.rx_callback = tegra_tcu_receive; |
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tcu->tx = mbox_request_channel_byname(&tcu->tx_client, "tx"); |
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if (IS_ERR(tcu->tx)) { |
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err = PTR_ERR(tcu->tx); |
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dev_err(&pdev->dev, "failed to get tx mailbox: %d\n", err); |
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return err; |
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} |
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tcu->rx = mbox_request_channel_byname(&tcu->rx_client, "rx"); |
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if (IS_ERR(tcu->rx)) { |
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err = PTR_ERR(tcu->rx); |
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dev_err(&pdev->dev, "failed to get rx mailbox: %d\n", err); |
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goto free_tx; |
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} |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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/* setup the console */ |
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strcpy(tcu->console.name, "ttyTCU"); |
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tcu->console.device = uart_console_device; |
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tcu->console.flags = CON_PRINTBUFFER | CON_ANYTIME; |
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tcu->console.index = -1; |
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tcu->console.write = tegra_tcu_console_write; |
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tcu->console.setup = tegra_tcu_console_setup; |
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tcu->console.data = &tcu->driver; |
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#endif |
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/* setup the driver */ |
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tcu->driver.owner = THIS_MODULE; |
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tcu->driver.driver_name = "tegra-tcu"; |
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tcu->driver.dev_name = "ttyTCU"; |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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tcu->driver.cons = &tcu->console; |
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#endif |
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tcu->driver.nr = 1; |
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err = uart_register_driver(&tcu->driver); |
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if (err) { |
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dev_err(&pdev->dev, "failed to register UART driver: %d\n", |
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err); |
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goto free_rx; |
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} |
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/* setup the port */ |
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port = &tcu->port; |
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spin_lock_init(&port->lock); |
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port->dev = &pdev->dev; |
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port->type = PORT_TEGRA_TCU; |
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port->ops = &tegra_tcu_uart_ops; |
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port->fifosize = 1; |
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port->iotype = UPIO_MEM; |
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port->flags = UPF_BOOT_AUTOCONF; |
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port->private_data = tcu; |
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err = uart_add_one_port(&tcu->driver, port); |
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if (err) { |
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dev_err(&pdev->dev, "failed to add UART port: %d\n", err); |
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goto unregister_uart; |
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} |
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platform_set_drvdata(pdev, tcu); |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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register_console(&tcu->console); |
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#endif |
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return 0; |
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unregister_uart: |
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uart_unregister_driver(&tcu->driver); |
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free_rx: |
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mbox_free_channel(tcu->rx); |
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free_tx: |
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mbox_free_channel(tcu->tx); |
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return err; |
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} |
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static int tegra_tcu_remove(struct platform_device *pdev) |
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{ |
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struct tegra_tcu *tcu = platform_get_drvdata(pdev); |
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#if IS_ENABLED(CONFIG_SERIAL_TEGRA_TCU_CONSOLE) |
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unregister_console(&tcu->console); |
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#endif |
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uart_remove_one_port(&tcu->driver, &tcu->port); |
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uart_unregister_driver(&tcu->driver); |
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mbox_free_channel(tcu->rx); |
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mbox_free_channel(tcu->tx); |
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return 0; |
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} |
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static const struct of_device_id tegra_tcu_match[] = { |
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{ .compatible = "nvidia,tegra194-tcu" }, |
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{ } |
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}; |
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static struct platform_driver tegra_tcu_driver = { |
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.driver = { |
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.name = "tegra-tcu", |
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.of_match_table = tegra_tcu_match, |
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}, |
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.probe = tegra_tcu_probe, |
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.remove = tegra_tcu_remove, |
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}; |
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module_platform_driver(tegra_tcu_driver); |
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MODULE_AUTHOR("Mikko Perttunen <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("NVIDIA Tegra Combined UART driver");
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