diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/tty/serial/vt8500_serial.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/tty/serial/vt8500_serial.c | 645 |
1 files changed, 0 insertions, 645 deletions
diff --git a/ANDROID_3.4.5/drivers/tty/serial/vt8500_serial.c b/ANDROID_3.4.5/drivers/tty/serial/vt8500_serial.c deleted file mode 100644 index 2be006fb..00000000 --- a/ANDROID_3.4.5/drivers/tty/serial/vt8500_serial.c +++ /dev/null @@ -1,645 +0,0 @@ -/* - * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> - * - * Based on msm_serial.c, which is: - * Copyright (C) 2007 Google, Inc. - * Author: Robert Love <rlove@google.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#if defined(CONFIG_SERIAL_VT8500_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -# define SUPPORT_SYSRQ -#endif - -#include <linux/hrtimer.h> -#include <linux/delay.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/ioport.h> -#include <linux/irq.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> -#include <linux/slab.h> -#include <linux/clk.h> -#include <linux/platform_device.h> - -/* - * UART Register offsets - */ - -#define VT8500_URTDR 0x0000 /* Transmit data */ -#define VT8500_URRDR 0x0004 /* Receive data */ -#define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */ -#define VT8500_URLCR 0x000C /* Line control */ -#define VT8500_URICR 0x0010 /* IrDA control */ -#define VT8500_URIER 0x0014 /* Interrupt enable */ -#define VT8500_URISR 0x0018 /* Interrupt status */ -#define VT8500_URUSR 0x001c /* UART status */ -#define VT8500_URFCR 0x0020 /* FIFO control */ -#define VT8500_URFIDX 0x0024 /* FIFO index */ -#define VT8500_URBKR 0x0028 /* Break signal count */ -#define VT8500_URTOD 0x002c /* Time out divisor */ -#define VT8500_TXFIFO 0x1000 /* Transmit FIFO (16x8) */ -#define VT8500_RXFIFO 0x1020 /* Receive FIFO (16x10) */ - -/* - * Interrupt enable and status bits - */ - -#define TXDE (1 << 0) /* Tx Data empty */ -#define RXDF (1 << 1) /* Rx Data full */ -#define TXFAE (1 << 2) /* Tx FIFO almost empty */ -#define TXFE (1 << 3) /* Tx FIFO empty */ -#define RXFAF (1 << 4) /* Rx FIFO almost full */ -#define RXFF (1 << 5) /* Rx FIFO full */ -#define TXUDR (1 << 6) /* Tx underrun */ -#define RXOVER (1 << 7) /* Rx overrun */ -#define PER (1 << 8) /* Parity error */ -#define FER (1 << 9) /* Frame error */ -#define TCTS (1 << 10) /* Toggle of CTS */ -#define RXTOUT (1 << 11) /* Rx timeout */ -#define BKDONE (1 << 12) /* Break signal done */ -#define ERR (1 << 13) /* AHB error response */ - -#define RX_FIFO_INTS (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT) -#define TX_FIFO_INTS (TXFAE | TXFE | TXUDR) - -struct vt8500_port { - struct uart_port uart; - char name[16]; - struct clk *clk; - unsigned int ier; -}; - -static inline void vt8500_write(struct uart_port *port, unsigned int val, - unsigned int off) -{ - writel(val, port->membase + off); -} - -static inline unsigned int vt8500_read(struct uart_port *port, unsigned int off) -{ - return readl(port->membase + off); -} - -static void vt8500_stop_tx(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = container_of(port, - struct vt8500_port, - uart); - - vt8500_port->ier &= ~TX_FIFO_INTS; - vt8500_write(port, vt8500_port->ier, VT8500_URIER); -} - -static void vt8500_stop_rx(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = container_of(port, - struct vt8500_port, - uart); - - vt8500_port->ier &= ~RX_FIFO_INTS; - vt8500_write(port, vt8500_port->ier, VT8500_URIER); -} - -static void vt8500_enable_ms(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = container_of(port, - struct vt8500_port, - uart); - - vt8500_port->ier |= TCTS; - vt8500_write(port, vt8500_port->ier, VT8500_URIER); -} - -static void handle_rx(struct uart_port *port) -{ - struct tty_struct *tty = tty_port_tty_get(&port->state->port); - if (!tty) { - /* Discard data: no tty available */ - int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8; - u16 ch; - while (count--) - ch = readw(port->membase + VT8500_RXFIFO); - return; - } - - /* - * Handle overrun - */ - if ((vt8500_read(port, VT8500_URISR) & RXOVER)) { - port->icount.overrun++; - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - } - - /* and now the main RX loop */ - while (vt8500_read(port, VT8500_URFIDX) & 0x1f00) { - unsigned int c; - char flag = TTY_NORMAL; - - c = readw(port->membase + VT8500_RXFIFO) & 0x3ff; - - /* Mask conditions we're ignorning. */ - c &= ~port->read_status_mask; - - if (c & FER) { - port->icount.frame++; - flag = TTY_FRAME; - } else if (c & PER) { - port->icount.parity++; - flag = TTY_PARITY; - } - port->icount.rx++; - - if (!uart_handle_sysrq_char(port, c)) - tty_insert_flip_char(tty, c, flag); - } - - tty_flip_buffer_push(tty); - tty_kref_put(tty); -} - -static void handle_tx(struct uart_port *port) -{ - struct circ_buf *xmit = &port->state->xmit; - - if (port->x_char) { - writeb(port->x_char, port->membase + VT8500_TXFIFO); - port->icount.tx++; - port->x_char = 0; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - vt8500_stop_tx(port); - return; - } - - while ((vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16) { - if (uart_circ_empty(xmit)) - break; - - writeb(xmit->buf[xmit->tail], port->membase + VT8500_TXFIFO); - - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - } - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - vt8500_stop_tx(port); -} - -static void vt8500_start_tx(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = container_of(port, - struct vt8500_port, - uart); - - vt8500_port->ier &= ~TX_FIFO_INTS; - vt8500_write(port, vt8500_port->ier, VT8500_URIER); - handle_tx(port); - vt8500_port->ier |= TX_FIFO_INTS; - vt8500_write(port, vt8500_port->ier, VT8500_URIER); -} - -static void handle_delta_cts(struct uart_port *port) -{ - port->icount.cts++; - wake_up_interruptible(&port->state->port.delta_msr_wait); -} - -static irqreturn_t vt8500_irq(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - unsigned long isr; - - spin_lock(&port->lock); - isr = vt8500_read(port, VT8500_URISR); - - /* Acknowledge active status bits */ - vt8500_write(port, isr, VT8500_URISR); - - if (isr & RX_FIFO_INTS) - handle_rx(port); - if (isr & TX_FIFO_INTS) - handle_tx(port); - if (isr & TCTS) - handle_delta_cts(port); - - spin_unlock(&port->lock); - - return IRQ_HANDLED; -} - -static unsigned int vt8500_tx_empty(struct uart_port *port) -{ - return (vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16 ? - TIOCSER_TEMT : 0; -} - -static unsigned int vt8500_get_mctrl(struct uart_port *port) -{ - unsigned int usr; - - usr = vt8500_read(port, VT8500_URUSR); - if (usr & (1 << 4)) - return TIOCM_CTS; - else - return 0; -} - -static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ -} - -static void vt8500_break_ctl(struct uart_port *port, int break_ctl) -{ - if (break_ctl) - vt8500_write(port, vt8500_read(port, VT8500_URLCR) | (1 << 9), - VT8500_URLCR); -} - -static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud) -{ - unsigned long div; - unsigned int loops = 1000; - - div = vt8500_read(port, VT8500_URDIV) & ~(0x3ff); - - if (unlikely((baud < 900) || (baud > 921600))) - div |= 7; - else - div |= (921600 / baud) - 1; - - while ((vt8500_read(port, VT8500_URUSR) & (1 << 5)) && --loops) - cpu_relax(); - vt8500_write(port, div, VT8500_URDIV); - - return baud; -} - -static int vt8500_startup(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = - container_of(port, struct vt8500_port, uart); - int ret; - - snprintf(vt8500_port->name, sizeof(vt8500_port->name), - "vt8500_serial%d", port->line); - - ret = request_irq(port->irq, vt8500_irq, IRQF_TRIGGER_HIGH, - vt8500_port->name, port); - if (unlikely(ret)) - return ret; - - vt8500_write(port, 0x03, VT8500_URLCR); /* enable TX & RX */ - - return 0; -} - -static void vt8500_shutdown(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = - container_of(port, struct vt8500_port, uart); - - vt8500_port->ier = 0; - - /* disable interrupts and FIFOs */ - vt8500_write(&vt8500_port->uart, 0, VT8500_URIER); - vt8500_write(&vt8500_port->uart, 0x880, VT8500_URFCR); - free_irq(port->irq, port); -} - -static void vt8500_set_termios(struct uart_port *port, - struct ktermios *termios, - struct ktermios *old) -{ - struct vt8500_port *vt8500_port = - container_of(port, struct vt8500_port, uart); - unsigned long flags; - unsigned int baud, lcr; - unsigned int loops = 1000; - - spin_lock_irqsave(&port->lock, flags); - - /* calculate and set baud rate */ - baud = uart_get_baud_rate(port, termios, old, 900, 921600); - baud = vt8500_set_baud_rate(port, baud); - if (tty_termios_baud_rate(termios)) - tty_termios_encode_baud_rate(termios, baud, baud); - - /* calculate parity */ - lcr = vt8500_read(&vt8500_port->uart, VT8500_URLCR); - lcr &= ~((1 << 5) | (1 << 4)); - if (termios->c_cflag & PARENB) { - lcr |= (1 << 4); - termios->c_cflag &= ~CMSPAR; - if (termios->c_cflag & PARODD) - lcr |= (1 << 5); - } - - /* calculate bits per char */ - lcr &= ~(1 << 2); - switch (termios->c_cflag & CSIZE) { - case CS7: - break; - case CS8: - default: - lcr |= (1 << 2); - termios->c_cflag &= ~CSIZE; - termios->c_cflag |= CS8; - break; - } - - /* calculate stop bits */ - lcr &= ~(1 << 3); - if (termios->c_cflag & CSTOPB) - lcr |= (1 << 3); - - /* set parity, bits per char, and stop bit */ - vt8500_write(&vt8500_port->uart, lcr, VT8500_URLCR); - - /* Configure status bits to ignore based on termio flags. */ - port->read_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->read_status_mask = FER | PER; - - uart_update_timeout(port, termios->c_cflag, baud); - - /* Reset FIFOs */ - vt8500_write(&vt8500_port->uart, 0x88c, VT8500_URFCR); - while ((vt8500_read(&vt8500_port->uart, VT8500_URFCR) & 0xc) - && --loops) - cpu_relax(); - - /* Every possible FIFO-related interrupt */ - vt8500_port->ier = RX_FIFO_INTS | TX_FIFO_INTS; - - /* - * CTS flow control - */ - if (UART_ENABLE_MS(&vt8500_port->uart, termios->c_cflag)) - vt8500_port->ier |= TCTS; - - vt8500_write(&vt8500_port->uart, 0x881, VT8500_URFCR); - vt8500_write(&vt8500_port->uart, vt8500_port->ier, VT8500_URIER); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static const char *vt8500_type(struct uart_port *port) -{ - struct vt8500_port *vt8500_port = - container_of(port, struct vt8500_port, uart); - return vt8500_port->name; -} - -static void vt8500_release_port(struct uart_port *port) -{ -} - -static int vt8500_request_port(struct uart_port *port) -{ - return 0; -} - -static void vt8500_config_port(struct uart_port *port, int flags) -{ - port->type = PORT_VT8500; -} - -static int vt8500_verify_port(struct uart_port *port, - struct serial_struct *ser) -{ - if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_VT8500)) - return -EINVAL; - if (unlikely(port->irq != ser->irq)) - return -EINVAL; - return 0; -} - -static struct vt8500_port *vt8500_uart_ports[4]; -static struct uart_driver vt8500_uart_driver; - -#ifdef CONFIG_SERIAL_VT8500_CONSOLE - -static inline void wait_for_xmitr(struct uart_port *port) -{ - unsigned int status, tmout = 10000; - - /* Wait up to 10ms for the character(s) to be sent. */ - do { - status = vt8500_read(port, VT8500_URFIDX); - - if (--tmout == 0) - break; - udelay(1); - } while (status & 0x10); -} - -static void vt8500_console_putchar(struct uart_port *port, int c) -{ - wait_for_xmitr(port); - writeb(c, port->membase + VT8500_TXFIFO); -} - -static void vt8500_console_write(struct console *co, const char *s, - unsigned int count) -{ - struct vt8500_port *vt8500_port = vt8500_uart_ports[co->index]; - unsigned long ier; - - BUG_ON(co->index < 0 || co->index >= vt8500_uart_driver.nr); - - ier = vt8500_read(&vt8500_port->uart, VT8500_URIER); - vt8500_write(&vt8500_port->uart, VT8500_URIER, 0); - - uart_console_write(&vt8500_port->uart, s, count, - vt8500_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and switch back to FIFO - */ - wait_for_xmitr(&vt8500_port->uart); - vt8500_write(&vt8500_port->uart, VT8500_URIER, ier); -} - -static int __init vt8500_console_setup(struct console *co, char *options) -{ - struct vt8500_port *vt8500_port; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (unlikely(co->index >= vt8500_uart_driver.nr || co->index < 0)) - return -ENXIO; - - vt8500_port = vt8500_uart_ports[co->index]; - - if (!vt8500_port) - return -ENODEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - return uart_set_options(&vt8500_port->uart, - co, baud, parity, bits, flow); -} - -static struct console vt8500_console = { - .name = "ttyWMT", - .write = vt8500_console_write, - .device = uart_console_device, - .setup = vt8500_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &vt8500_uart_driver, -}; - -#define VT8500_CONSOLE (&vt8500_console) - -#else -#define VT8500_CONSOLE NULL -#endif - -static struct uart_ops vt8500_uart_pops = { - .tx_empty = vt8500_tx_empty, - .set_mctrl = vt8500_set_mctrl, - .get_mctrl = vt8500_get_mctrl, - .stop_tx = vt8500_stop_tx, - .start_tx = vt8500_start_tx, - .stop_rx = vt8500_stop_rx, - .enable_ms = vt8500_enable_ms, - .break_ctl = vt8500_break_ctl, - .startup = vt8500_startup, - .shutdown = vt8500_shutdown, - .set_termios = vt8500_set_termios, - .type = vt8500_type, - .release_port = vt8500_release_port, - .request_port = vt8500_request_port, - .config_port = vt8500_config_port, - .verify_port = vt8500_verify_port, -}; - -static struct uart_driver vt8500_uart_driver = { - .owner = THIS_MODULE, - .driver_name = "vt8500_serial", - .dev_name = "ttyWMT", - .nr = 6, - .cons = VT8500_CONSOLE, -}; - -static int __devinit vt8500_serial_probe(struct platform_device *pdev) -{ - struct vt8500_port *vt8500_port; - struct resource *mmres, *irqres; - int ret; - - mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); - irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!mmres || !irqres) - return -ENODEV; - - vt8500_port = kzalloc(sizeof(struct vt8500_port), GFP_KERNEL); - if (!vt8500_port) - return -ENOMEM; - - vt8500_port->uart.type = PORT_VT8500; - vt8500_port->uart.iotype = UPIO_MEM; - vt8500_port->uart.mapbase = mmres->start; - vt8500_port->uart.irq = irqres->start; - vt8500_port->uart.fifosize = 16; - vt8500_port->uart.ops = &vt8500_uart_pops; - vt8500_port->uart.line = pdev->id; - vt8500_port->uart.dev = &pdev->dev; - vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; - vt8500_port->uart.uartclk = 24000000; - - snprintf(vt8500_port->name, sizeof(vt8500_port->name), - "VT8500 UART%d", pdev->id); - - vt8500_port->uart.membase = ioremap(mmres->start, resource_size(mmres)); - if (!vt8500_port->uart.membase) { - ret = -ENOMEM; - goto err; - } - - vt8500_uart_ports[pdev->id] = vt8500_port; - - uart_add_one_port(&vt8500_uart_driver, &vt8500_port->uart); - - platform_set_drvdata(pdev, vt8500_port); - - return 0; - -err: - kfree(vt8500_port); - return ret; -} - -static int __devexit vt8500_serial_remove(struct platform_device *pdev) -{ - struct vt8500_port *vt8500_port = platform_get_drvdata(pdev); - - platform_set_drvdata(pdev, NULL); - uart_remove_one_port(&vt8500_uart_driver, &vt8500_port->uart); - kfree(vt8500_port); - - return 0; -} - -static struct platform_driver vt8500_platform_driver = { - .probe = vt8500_serial_probe, - .remove = __devexit_p(vt8500_serial_remove), - .driver = { - .name = "vt8500_serial", - .owner = THIS_MODULE, - }, -}; - -static int __init vt8500_serial_init(void) -{ - int ret; - - ret = uart_register_driver(&vt8500_uart_driver); - if (unlikely(ret)) - return ret; - - ret = platform_driver_register(&vt8500_platform_driver); - - if (unlikely(ret)) - uart_unregister_driver(&vt8500_uart_driver); - - return ret; -} - -static void __exit vt8500_serial_exit(void) -{ -#ifdef CONFIG_SERIAL_VT8500_CONSOLE - unregister_console(&vt8500_console); -#endif - platform_driver_unregister(&vt8500_platform_driver); - uart_unregister_driver(&vt8500_uart_driver); -} - -module_init(vt8500_serial_init); -module_exit(vt8500_serial_exit); - -MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); -MODULE_DESCRIPTION("Driver for vt8500 serial device"); -MODULE_LICENSE("GPL"); |