ARM: fiq_debugger: fix multiple consoles and make it a preferred console
Fix setting up consoles on multiple fiq debugger devices by splitting the tty driver init into the initcall, and initializing the single tty device during probe. Has the side effect of moving the tty device node to /dev/ttyFIQx, where x is the platform device id, which should normally match the serial port. To avoid having to pass a different console=/dev/ttyFIQx for every device, make the fiq debugger a preferred console that will be used by default if no console was passed on the command line. Change-Id: I6cc2670628a41e84615859bc96adba189966d647 Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross
John Stultz
parent
c70fe44edf
commit
30f1c58cc5
1 changed files with 84 additions and 29 deletions
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@ -45,6 +45,8 @@
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#define DEBUG_MAX 64
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#define MAX_UNHANDLED_FIQ_COUNT 1000000
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#define MAX_FIQ_DEBUGGER_PORTS 4
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#define THREAD_INFO(sp) ((struct thread_info *) \
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((unsigned long)(sp) & ~(THREAD_SIZE - 1)))
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@ -81,7 +83,6 @@ struct fiq_debugger_state {
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#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
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struct console console;
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struct tty_driver *tty_driver;
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struct tty_struct *tty;
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int tty_open_count;
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struct fiq_debugger_ringbuf *tty_rbuf;
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@ -92,6 +93,10 @@ struct fiq_debugger_state {
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unsigned int last_local_timer_irqs[NR_CPUS];
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};
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#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
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struct tty_driver *fiq_tty_driver;
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#endif
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#ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP
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static bool initial_no_sleep = true;
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#else
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@ -913,10 +918,8 @@ static void debug_resume(struct fiq_glue_handler *h)
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#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
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struct tty_driver *debug_console_device(struct console *co, int *index)
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{
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struct fiq_debugger_state *state;
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state = container_of(co, struct fiq_debugger_state, console);
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*index = 0;
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return state->tty_driver;
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*index = co->index;
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return fiq_tty_driver;
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}
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static void debug_console_write(struct console *co,
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@ -948,7 +951,9 @@ static struct console fiq_debugger_console = {
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int fiq_tty_open(struct tty_struct *tty, struct file *filp)
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{
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struct fiq_debugger_state *state = tty->driver->driver_state;
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int line = tty->index;
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struct fiq_debugger_state **states = tty->driver->driver_state;
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struct fiq_debugger_state *state = states[line];
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if (state->tty_open_count++)
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return 0;
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@ -1035,36 +1040,66 @@ static const struct tty_operations fiq_tty_driver_ops = {
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#endif
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};
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static int fiq_debugger_tty_init(struct fiq_debugger_state *state)
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static int fiq_debugger_tty_init(void)
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{
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int ret = -EINVAL;
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int ret;
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struct fiq_debugger_state **states = NULL;
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state->tty_driver = alloc_tty_driver(1);
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if (!state->tty_driver) {
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pr_err("Failed to allocate fiq debugger tty\n");
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states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL);
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if (!states) {
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pr_err("Failed to allocate fiq debugger state structres\n");
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return -ENOMEM;
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}
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state->tty_driver->owner = THIS_MODULE;
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state->tty_driver->driver_name = "fiq-debugger";
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state->tty_driver->name = "ttyFIQ";
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state->tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
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state->tty_driver->subtype = SERIAL_TYPE_NORMAL;
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state->tty_driver->init_termios = tty_std_termios;
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state->tty_driver->init_termios.c_cflag =
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B115200 | CS8 | CREAD | HUPCL | CLOCAL;
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state->tty_driver->init_termios.c_ispeed =
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state->tty_driver->init_termios.c_ospeed = 115200;
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state->tty_driver->flags = TTY_DRIVER_REAL_RAW;
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tty_set_operations(state->tty_driver, &fiq_tty_driver_ops);
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state->tty_driver->driver_state = state;
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fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS);
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if (!fiq_tty_driver) {
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pr_err("Failed to allocate fiq debugger tty\n");
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ret = -ENOMEM;
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goto err_free_state;
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}
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ret = tty_register_driver(state->tty_driver);
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fiq_tty_driver->owner = THIS_MODULE;
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fiq_tty_driver->driver_name = "fiq-debugger";
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fiq_tty_driver->name = "ttyFIQ";
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fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
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fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL;
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fiq_tty_driver->init_termios = tty_std_termios;
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fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_DYNAMIC_DEV;
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fiq_tty_driver->driver_state = states;
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fiq_tty_driver->init_termios.c_cflag =
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B115200 | CS8 | CREAD | HUPCL | CLOCAL;
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fiq_tty_driver->init_termios.c_ispeed = 115200;
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fiq_tty_driver->init_termios.c_ospeed = 115200;
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tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops);
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ret = tty_register_driver(fiq_tty_driver);
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if (ret) {
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pr_err("Failed to register fiq tty: %d\n", ret);
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goto err;
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goto err_free_tty;
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}
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pr_info("Registered FIQ tty driver\n");
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return 0;
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err_free_tty:
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put_tty_driver(fiq_tty_driver);
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fiq_tty_driver = NULL;
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err_free_state:
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kfree(states);
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return ret;
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}
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static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state)
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{
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int ret;
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struct device *tty_dev;
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struct fiq_debugger_state **states = fiq_tty_driver->driver_state;
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states[state->pdev->id] = state;
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state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024);
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if (!state->tty_rbuf) {
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pr_err("Failed to allocate fiq debugger ringbuf\n");
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@ -1072,13 +1107,23 @@ static int fiq_debugger_tty_init(struct fiq_debugger_state *state)
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goto err;
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}
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pr_info("Registered FIQ tty driver %p\n", state->tty_driver);
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tty_dev = tty_register_device(fiq_tty_driver, state->pdev->id,
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&state->pdev->dev);
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if (IS_ERR(tty_dev)) {
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pr_err("Failed to register fiq debugger tty device\n");
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ret = PTR_ERR(tty_dev);
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goto err;
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}
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device_set_wakeup_capable(tty_dev, 1);
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pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id);
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return 0;
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err:
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fiq_debugger_ringbuf_free(state->tty_rbuf);
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state->tty_rbuf = NULL;
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put_tty_driver(state->tty_driver);
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return ret;
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}
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#endif
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@ -1111,6 +1156,9 @@ static int fiq_debugger_probe(struct platform_device *pdev)
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int fiq;
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int uart_irq;
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if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS)
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return -EINVAL;
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if (!pdata->uart_getc || !pdata->uart_putc)
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return -EINVAL;
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if ((pdata->uart_enable && !pdata->uart_disable) ||
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@ -1228,8 +1276,12 @@ static int fiq_debugger_probe(struct platform_device *pdev)
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#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
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state->console = fiq_debugger_console;
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state->console.index = pdev->id;
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if (!console_set_on_cmdline)
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add_preferred_console(state->console.name,
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state->console.index, NULL);
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register_console(&state->console);
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fiq_debugger_tty_init(state);
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fiq_debugger_tty_init_one(state);
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#endif
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return 0;
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@ -1263,6 +1315,9 @@ static struct platform_driver fiq_debugger_driver = {
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static int __init fiq_debugger_init(void)
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{
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#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
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fiq_debugger_tty_init();
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#endif
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return platform_driver_register(&fiq_debugger_driver);
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}
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