352 lines
9.0 KiB
C
352 lines
9.0 KiB
C
/*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (C) 2012 Intel, Inc.
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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/console.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/goldfish.h>
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enum {
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GOLDFISH_TTY_PUT_CHAR = 0x00,
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GOLDFISH_TTY_BYTES_READY = 0x04,
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GOLDFISH_TTY_CMD = 0x08,
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GOLDFISH_TTY_DATA_PTR = 0x10,
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GOLDFISH_TTY_DATA_LEN = 0x14,
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GOLDFISH_TTY_DATA_PTR_HIGH = 0x18,
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GOLDFISH_TTY_CMD_INT_DISABLE = 0,
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GOLDFISH_TTY_CMD_INT_ENABLE = 1,
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GOLDFISH_TTY_CMD_WRITE_BUFFER = 2,
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GOLDFISH_TTY_CMD_READ_BUFFER = 3,
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};
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struct goldfish_tty {
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struct tty_port port;
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spinlock_t lock;
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void __iomem *base;
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u32 irq;
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int opencount;
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struct console console;
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};
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static DEFINE_MUTEX(goldfish_tty_lock);
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static struct tty_driver *goldfish_tty_driver;
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static u32 goldfish_tty_line_count = 8;
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static u32 goldfish_tty_current_line_count;
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static struct goldfish_tty *goldfish_ttys;
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static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
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{
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unsigned long irq_flags;
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struct goldfish_tty *qtty = &goldfish_ttys[line];
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void __iomem *base = qtty->base;
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spin_lock_irqsave(&qtty->lock, irq_flags);
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gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
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base + GOLDFISH_TTY_DATA_PTR_HIGH);
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writel(count, base + GOLDFISH_TTY_DATA_LEN);
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writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
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spin_unlock_irqrestore(&qtty->lock, irq_flags);
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}
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static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
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{
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struct goldfish_tty *qtty = dev_id;
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void __iomem *base = qtty->base;
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unsigned long irq_flags;
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unsigned char *buf;
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u32 count;
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count = readl(base + GOLDFISH_TTY_BYTES_READY);
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if (count == 0)
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return IRQ_NONE;
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count = tty_prepare_flip_string(&qtty->port, &buf, count);
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spin_lock_irqsave(&qtty->lock, irq_flags);
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gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
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base + GOLDFISH_TTY_DATA_PTR_HIGH);
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writel(count, base + GOLDFISH_TTY_DATA_LEN);
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writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
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spin_unlock_irqrestore(&qtty->lock, irq_flags);
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tty_schedule_flip(&qtty->port);
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return IRQ_HANDLED;
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}
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static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
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{
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
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port);
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writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
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return 0;
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}
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static void goldfish_tty_shutdown(struct tty_port *port)
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{
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
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port);
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writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
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}
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static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
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{
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
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return tty_port_open(&qtty->port, tty, filp);
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}
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static void goldfish_tty_close(struct tty_struct *tty, struct file *filp)
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{
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tty_port_close(tty->port, tty, filp);
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}
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static void goldfish_tty_hangup(struct tty_struct *tty)
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{
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tty_port_hangup(tty->port);
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}
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static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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goldfish_tty_do_write(tty->index, buf, count);
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return count;
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}
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static int goldfish_tty_write_room(struct tty_struct *tty)
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{
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return 0x10000;
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}
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static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
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{
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
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void __iomem *base = qtty->base;
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return readl(base + GOLDFISH_TTY_BYTES_READY);
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}
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static void goldfish_tty_console_write(struct console *co, const char *b,
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unsigned count)
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{
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goldfish_tty_do_write(co->index, b, count);
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}
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static struct tty_driver *goldfish_tty_console_device(struct console *c,
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int *index)
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{
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*index = c->index;
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return goldfish_tty_driver;
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}
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static int goldfish_tty_console_setup(struct console *co, char *options)
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{
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if ((unsigned)co->index >= goldfish_tty_line_count)
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return -ENODEV;
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if (!goldfish_ttys[co->index].base)
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return -ENODEV;
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return 0;
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}
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static const struct tty_port_operations goldfish_port_ops = {
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.activate = goldfish_tty_activate,
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.shutdown = goldfish_tty_shutdown
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};
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static const struct tty_operations goldfish_tty_ops = {
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.open = goldfish_tty_open,
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.close = goldfish_tty_close,
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.hangup = goldfish_tty_hangup,
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.write = goldfish_tty_write,
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.write_room = goldfish_tty_write_room,
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.chars_in_buffer = goldfish_tty_chars_in_buffer,
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};
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static int goldfish_tty_create_driver(void)
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{
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int ret;
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struct tty_driver *tty;
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goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) *
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goldfish_tty_line_count, GFP_KERNEL);
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if (goldfish_ttys == NULL) {
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ret = -ENOMEM;
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goto err_alloc_goldfish_ttys_failed;
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}
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tty = alloc_tty_driver(goldfish_tty_line_count);
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if (tty == NULL) {
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ret = -ENOMEM;
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goto err_alloc_tty_driver_failed;
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}
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tty->driver_name = "goldfish";
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tty->name = "ttyGF";
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tty->type = TTY_DRIVER_TYPE_SERIAL;
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tty->subtype = SERIAL_TYPE_NORMAL;
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tty->init_termios = tty_std_termios;
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tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_DYNAMIC_DEV;
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tty_set_operations(tty, &goldfish_tty_ops);
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ret = tty_register_driver(tty);
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if (ret)
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goto err_tty_register_driver_failed;
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goldfish_tty_driver = tty;
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return 0;
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err_tty_register_driver_failed:
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put_tty_driver(tty);
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err_alloc_tty_driver_failed:
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kfree(goldfish_ttys);
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goldfish_ttys = NULL;
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err_alloc_goldfish_ttys_failed:
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return ret;
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}
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static void goldfish_tty_delete_driver(void)
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{
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tty_unregister_driver(goldfish_tty_driver);
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put_tty_driver(goldfish_tty_driver);
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goldfish_tty_driver = NULL;
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kfree(goldfish_ttys);
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goldfish_ttys = NULL;
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}
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static int goldfish_tty_probe(struct platform_device *pdev)
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{
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struct goldfish_tty *qtty;
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int ret = -EINVAL;
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struct resource *r;
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struct device *ttydev;
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void __iomem *base;
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u32 irq;
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unsigned int line;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (r == NULL)
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return -EINVAL;
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base = ioremap(r->start, 0x1000);
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if (base == NULL)
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pr_err("goldfish_tty: unable to remap base\n");
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (r == NULL)
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goto err_unmap;
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irq = r->start;
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mutex_lock(&goldfish_tty_lock);
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if (pdev->id == PLATFORM_DEVID_NONE)
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line = goldfish_tty_current_line_count;
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else
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line = pdev->id;
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if (line >= goldfish_tty_line_count)
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goto err_create_driver_failed;
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if (goldfish_tty_current_line_count == 0) {
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ret = goldfish_tty_create_driver();
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if (ret)
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goto err_create_driver_failed;
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}
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goldfish_tty_current_line_count++;
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qtty = &goldfish_ttys[line];
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spin_lock_init(&qtty->lock);
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tty_port_init(&qtty->port);
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qtty->port.ops = &goldfish_port_ops;
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qtty->base = base;
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qtty->irq = irq;
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writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
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ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
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"goldfish_tty", qtty);
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if (ret)
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goto err_request_irq_failed;
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ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
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line, &pdev->dev);
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if (IS_ERR(ttydev)) {
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ret = PTR_ERR(ttydev);
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goto err_tty_register_device_failed;
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}
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strcpy(qtty->console.name, "ttyGF");
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qtty->console.write = goldfish_tty_console_write;
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qtty->console.device = goldfish_tty_console_device;
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qtty->console.setup = goldfish_tty_console_setup;
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qtty->console.flags = CON_PRINTBUFFER;
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qtty->console.index = line;
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register_console(&qtty->console);
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platform_set_drvdata(pdev, qtty);
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mutex_unlock(&goldfish_tty_lock);
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return 0;
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err_tty_register_device_failed:
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free_irq(irq, qtty);
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err_request_irq_failed:
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goldfish_tty_current_line_count--;
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if (goldfish_tty_current_line_count == 0)
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goldfish_tty_delete_driver();
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err_create_driver_failed:
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mutex_unlock(&goldfish_tty_lock);
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err_unmap:
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iounmap(base);
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return ret;
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}
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static int goldfish_tty_remove(struct platform_device *pdev)
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{
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struct goldfish_tty *qtty = platform_get_drvdata(pdev);
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mutex_lock(&goldfish_tty_lock);
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unregister_console(&qtty->console);
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tty_unregister_device(goldfish_tty_driver, qtty->console.index);
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iounmap(qtty->base);
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qtty->base = NULL;
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free_irq(qtty->irq, pdev);
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goldfish_tty_current_line_count--;
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if (goldfish_tty_current_line_count == 0)
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goldfish_tty_delete_driver();
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mutex_unlock(&goldfish_tty_lock);
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return 0;
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}
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static const struct of_device_id goldfish_tty_of_match[] = {
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{ .compatible = "google,goldfish-tty", },
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{},
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};
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MODULE_DEVICE_TABLE(of, goldfish_tty_of_match);
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static struct platform_driver goldfish_tty_platform_driver = {
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.probe = goldfish_tty_probe,
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.remove = goldfish_tty_remove,
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.driver = {
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.name = "goldfish_tty",
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.of_match_table = goldfish_tty_of_match,
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}
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};
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module_platform_driver(goldfish_tty_platform_driver);
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MODULE_LICENSE("GPL v2");
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