diff options
Diffstat (limited to 'drivers/serial/amba-pl010.c')
| -rw-r--r-- | drivers/serial/amba-pl010.c | 840 |
1 files changed, 840 insertions, 0 deletions
diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c new file mode 100644 index 000000000000..ac57fdc8711b --- /dev/null +++ b/drivers/serial/amba-pl010.c @@ -0,0 +1,840 @@ +/* + * linux/drivers/char/amba.c + * + * Driver for AMBA serial ports + * + * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. + * + * Copyright 1999 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $ + * + * This is a generic driver for ARM AMBA-type serial ports. They + * have a lot of 16550-like features, but are not register compatible. + * Note that although they do have CTS, DCD and DSR inputs, they do + * not have an RI input, nor do they have DTR or RTS outputs. If + * required, these have to be supplied via some other means (eg, GPIO) + * and hooked into this driver. + */ +#include <linux/config.h> + +#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/console.h> +#include <linux/sysrq.h> +#include <linux/device.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/serial_core.h> +#include <linux/serial.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/hardware/amba.h> +#include <asm/hardware/amba_serial.h> + +#define UART_NR 2 + +#define SERIAL_AMBA_MAJOR 204 +#define SERIAL_AMBA_MINOR 16 +#define SERIAL_AMBA_NR UART_NR + +#define AMBA_ISR_PASS_LIMIT 256 + +/* + * Access macros for the AMBA UARTs + */ +#define UART_GET_INT_STATUS(p) readb((p)->membase + UART010_IIR) +#define UART_PUT_ICR(p, c) writel((c), (p)->membase + UART010_ICR) +#define UART_GET_FR(p) readb((p)->membase + UART01x_FR) +#define UART_GET_CHAR(p) readb((p)->membase + UART01x_DR) +#define UART_PUT_CHAR(p, c) writel((c), (p)->membase + UART01x_DR) +#define UART_GET_RSR(p) readb((p)->membase + UART01x_RSR) +#define UART_GET_CR(p) readb((p)->membase + UART010_CR) +#define UART_PUT_CR(p,c) writel((c), (p)->membase + UART010_CR) +#define UART_GET_LCRL(p) readb((p)->membase + UART010_LCRL) +#define UART_PUT_LCRL(p,c) writel((c), (p)->membase + UART010_LCRL) +#define UART_GET_LCRM(p) readb((p)->membase + UART010_LCRM) +#define UART_PUT_LCRM(p,c) writel((c), (p)->membase + UART010_LCRM) +#define UART_GET_LCRH(p) readb((p)->membase + UART010_LCRH) +#define UART_PUT_LCRH(p,c) writel((c), (p)->membase + UART010_LCRH) +#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0) +#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0) +#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0) + +#define UART_DUMMY_RSR_RX /*256*/0 +#define UART_PORT_SIZE 64 + +/* + * On the Integrator platform, the port RTS and DTR are provided by + * bits in the following SC_CTRLS register bits: + * RTS DTR + * UART0 7 6 + * UART1 5 4 + */ +#define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET) +#define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET) + +/* + * We wrap our port structure around the generic uart_port. + */ +struct uart_amba_port { + struct uart_port port; + unsigned int dtr_mask; + unsigned int rts_mask; + unsigned int old_status; +}; + +static void pl010_stop_tx(struct uart_port *port, unsigned int tty_stop) +{ + unsigned int cr; + + cr = UART_GET_CR(port); + cr &= ~UART010_CR_TIE; + UART_PUT_CR(port, cr); +} + +static void pl010_start_tx(struct uart_port *port, unsigned int tty_start) +{ + unsigned int cr; + + cr = UART_GET_CR(port); + cr |= UART010_CR_TIE; + UART_PUT_CR(port, cr); +} + +static void pl010_stop_rx(struct uart_port *port) +{ + unsigned int cr; + + cr = UART_GET_CR(port); + cr &= ~(UART010_CR_RIE | UART010_CR_RTIE); + UART_PUT_CR(port, cr); +} + +static void pl010_enable_ms(struct uart_port *port) +{ + unsigned int cr; + + cr = UART_GET_CR(port); + cr |= UART010_CR_MSIE; + UART_PUT_CR(port, cr); +} + +static void +#ifdef SUPPORT_SYSRQ +pl010_rx_chars(struct uart_port *port, struct pt_regs *regs) +#else +pl010_rx_chars(struct uart_port *port) +#endif +{ + struct tty_struct *tty = port->info->tty; + unsigned int status, ch, flag, rsr, max_count = 256; + + status = UART_GET_FR(port); + while (UART_RX_DATA(status) && max_count--) { + if (tty->flip.count >= TTY_FLIPBUF_SIZE) { + if (tty->low_latency) + tty_flip_buffer_push(tty); + /* + * If this failed then we will throw away the + * bytes but must do so to clear interrupts. + */ + } + + ch = UART_GET_CHAR(port); + flag = TTY_NORMAL; + + port->icount.rx++; + + /* + * Note that the error handling code is + * out of the main execution path + */ + rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX; + if (rsr & UART01x_RSR_ANY) { + if (rsr & UART01x_RSR_BE) { + rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE); + port->icount.brk++; + if (uart_handle_break(port)) + goto ignore_char; + } else if (rsr & UART01x_RSR_PE) + port->icount.parity++; + else if (rsr & UART01x_RSR_FE) + port->icount.frame++; + if (rsr & UART01x_RSR_OE) + port->icount.overrun++; + + rsr &= port->read_status_mask; + + if (rsr & UART01x_RSR_BE) + flag = TTY_BREAK; + else if (rsr & UART01x_RSR_PE) + flag = TTY_PARITY; + else if (rsr & UART01x_RSR_FE) + flag = TTY_FRAME; + } + + if (uart_handle_sysrq_char(port, ch, regs)) + goto ignore_char; + + if ((rsr & port->ignore_status_mask) == 0) { + tty_insert_flip_char(tty, ch, flag); + } + if ((rsr & UART01x_RSR_OE) && + tty->flip.count < TTY_FLIPBUF_SIZE) { + /* + * Overrun is special, since it's reported + * immediately, and doesn't affect the current + * character + */ + tty_insert_flip_char(tty, 0, TTY_OVERRUN); + } + ignore_char: + status = UART_GET_FR(port); + } + tty_flip_buffer_push(tty); + return; +} + +static void pl010_tx_chars(struct uart_port *port) +{ + struct circ_buf *xmit = &port->info->xmit; + int count; + + if (port->x_char) { + UART_PUT_CHAR(port, port->x_char); + port->icount.tx++; + port->x_char = 0; + return; + } + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + pl010_stop_tx(port, 0); + return; + } + + count = port->fifosize >> 1; + do { + UART_PUT_CHAR(port, xmit->buf[xmit->tail]); + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + port->icount.tx++; + if (uart_circ_empty(xmit)) + break; + } while (--count > 0); + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); + + if (uart_circ_empty(xmit)) + pl010_stop_tx(port, 0); +} + +static void pl010_modem_status(struct uart_port *port) +{ + struct uart_amba_port *uap = (struct uart_amba_port *)port; + unsigned int status, delta; + + UART_PUT_ICR(&uap->port, 0); + + status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY; + + delta = status ^ uap->old_status; + uap->old_status = status; + + if (!delta) + return; + + if (delta & UART01x_FR_DCD) + uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD); + + if (delta & UART01x_FR_DSR) + uap->port.icount.dsr++; + + if (delta & UART01x_FR_CTS) + uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS); + + wake_up_interruptible(&uap->port.info->delta_msr_wait); +} + +static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs) +{ + struct uart_port *port = dev_id; + unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; + int handled = 0; + + spin_lock(&port->lock); + + status = UART_GET_INT_STATUS(port); + if (status) { + do { + if (status & (UART010_IIR_RTIS | UART010_IIR_RIS)) +#ifdef SUPPORT_SYSRQ + pl010_rx_chars(port, regs); +#else + pl010_rx_chars(port); +#endif + if (status & UART010_IIR_MIS) + pl010_modem_status(port); + if (status & UART010_IIR_TIS) + pl010_tx_chars(port); + + if (pass_counter-- == 0) + break; + + status = UART_GET_INT_STATUS(port); + } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS | + UART010_IIR_TIS)); + handled = 1; + } + + spin_unlock(&port->lock); + + return IRQ_RETVAL(handled); +} + +static unsigned int pl010_tx_empty(struct uart_port *port) +{ + return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT; +} + +static unsigned int pl010_get_mctrl(struct uart_port *port) +{ + unsigned int result = 0; + unsigned int status; + + status = UART_GET_FR(port); + if (status & UART01x_FR_DCD) + result |= TIOCM_CAR; + if (status & UART01x_FR_DSR) + result |= TIOCM_DSR; + if (status & UART01x_FR_CTS) + result |= TIOCM_CTS; + + return result; +} + +static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + struct uart_amba_port *uap = (struct uart_amba_port *)port; + unsigned int ctrls = 0, ctrlc = 0; + + if (mctrl & TIOCM_RTS) + ctrlc |= uap->rts_mask; + else + ctrls |= uap->rts_mask; + + if (mctrl & TIOCM_DTR) + ctrlc |= uap->dtr_mask; + else + ctrls |= uap->dtr_mask; + + __raw_writel(ctrls, SC_CTRLS); + __raw_writel(ctrlc, SC_CTRLC); +} + +static void pl010_break_ctl(struct uart_port *port, int break_state) +{ + unsigned long flags; + unsigned int lcr_h; + + spin_lock_irqsave(&port->lock, flags); + lcr_h = UART_GET_LCRH(port); + if (break_state == -1) + lcr_h |= UART01x_LCRH_BRK; + else + lcr_h &= ~UART01x_LCRH_BRK; + UART_PUT_LCRH(port, lcr_h); + spin_unlock_irqrestore(&port->lock, flags); +} + +static int pl010_startup(struct uart_port *port) +{ + struct uart_amba_port *uap = (struct uart_amba_port *)port; + int retval; + + /* + * Allocate the IRQ + */ + retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port); + if (retval) + return retval; + + /* + * initialise the old status of the modem signals + */ + uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY; + + /* + * Finally, enable interrupts + */ + UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE | + UART010_CR_RTIE); + + return 0; +} + +static void pl010_shutdown(struct uart_port *port) +{ + /* + * Free the interrupt + */ + free_irq(port->irq, port); + + /* + * disable all interrupts, disable the port + */ + UART_PUT_CR(port, 0); + + /* disable break condition and fifos */ + UART_PUT_LCRH(port, UART_GET_LCRH(port) & + ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN)); +} + +static void +pl010_set_termios(struct uart_port *port, struct termios *termios, + struct termios *old) +{ + unsigned int lcr_h, old_cr; + unsigned long flags; + unsigned int baud, quot; + + /* + * Ask the core to calculate the divisor for us. + */ + baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); + quot = uart_get_divisor(port, baud); + + switch (termios->c_cflag & CSIZE) { + case CS5: + lcr_h = UART01x_LCRH_WLEN_5; + break; + case CS6: + lcr_h = UART01x_LCRH_WLEN_6; + break; + case CS7: + lcr_h = UART01x_LCRH_WLEN_7; + break; + default: // CS8 + lcr_h = UART01x_LCRH_WLEN_8; + break; + } + if (termios->c_cflag & CSTOPB) + lcr_h |= UART01x_LCRH_STP2; + if (termios->c_cflag & PARENB) { + lcr_h |= UART01x_LCRH_PEN; + if (!(termios->c_cflag & PARODD)) + lcr_h |= UART01x_LCRH_EPS; + } + if (port->fifosize > 1) + lcr_h |= UART01x_LCRH_FEN; + + spin_lock_irqsave(&port->lock, flags); + + /* + * Update the per-port timeout. + */ + uart_update_timeout(port, termios->c_cflag, baud); + + port->read_status_mask = UART01x_RSR_OE; + if (termios->c_iflag & INPCK) + port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; + if (termios->c_iflag & (BRKINT | PARMRK)) + port->read_status_mask |= UART01x_RSR_BE; + + /* + * Characters to ignore + */ + port->ignore_status_mask = 0; + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; + if (termios->c_iflag & IGNBRK) { + port->ignore_status_mask |= UART01x_RSR_BE; + /* + * If we're ignoring parity and break indicators, + * ignore overruns too (for real raw support). + */ + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= UART01x_RSR_OE; + } + + /* + * Ignore all characters if CREAD is not set. + */ + if ((termios->c_cflag & CREAD) == 0) + port->ignore_status_mask |= UART_DUMMY_RSR_RX; + + /* first, disable everything */ + old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE; + + if (UART_ENABLE_MS(port, termios->c_cflag)) + old_cr |= UART010_CR_MSIE; + + UART_PUT_CR(port, 0); + + /* Set baud rate */ + quot -= 1; + UART_PUT_LCRM(port, ((quot & 0xf00) >> 8)); + UART_PUT_LCRL(port, (quot & 0xff)); + + /* + * ----------v----------v----------v----------v----- + * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L + * ----------^----------^----------^----------^----- + */ + UART_PUT_LCRH(port, lcr_h); + UART_PUT_CR(port, old_cr); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static const char *pl010_type(struct uart_port *port) +{ + return port->type == PORT_AMBA ? "AMBA" : NULL; +} + +/* + * Release the memory region(s) being used by 'port' + */ +static void pl010_release_port(struct uart_port *port) +{ + release_mem_region(port->mapbase, UART_PORT_SIZE); +} + +/* + * Request the memory region(s) being used by 'port' + */ +static int pl010_request_port(struct uart_port *port) +{ + return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010") + != NULL ? 0 : -EBUSY; +} + +/* + * Configure/autoconfigure the port. + */ +static void pl010_config_port(struct uart_port *port, int flags) +{ + if (flags & UART_CONFIG_TYPE) { + port->type = PORT_AMBA; + pl010_request_port(port); + } +} + +/* + * verify the new serial_struct (for TIOCSSERIAL). + */ +static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser) +{ + int ret = 0; + if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA) + ret = -EINVAL; + if (ser->irq < 0 || ser->irq >= NR_IRQS) + ret = -EINVAL; + if (ser->baud_base < 9600) + ret = -EINVAL; + return ret; +} + +static struct uart_ops amba_pl010_pops = { + .tx_empty = pl010_tx_empty, + .set_mctrl = pl010_set_mctrl, + .get_mctrl = pl010_get_mctrl, + .stop_tx = pl010_stop_tx, + .start_tx = pl010_start_tx, + .stop_rx = pl010_stop_rx, + .enable_ms = pl010_enable_ms, + .break_ctl = pl010_break_ctl, + .startup = pl010_startup, + .shutdown = pl010_shutdown, + .set_termios = pl010_set_termios, + .type = pl010_type, + .release_port = pl010_release_port, + .request_port = pl010_request_port, + .config_port = pl010_config_port, + .verify_port = pl010_verify_port, +}; + +static struct uart_amba_port amba_ports[UART_NR] = { + { + .port = { + .membase = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE), + .mapbase = INTEGRATOR_UART0_BASE, + .iotype = SERIAL_IO_MEM, + .irq = IRQ_UARTINT0, + .uartclk = 14745600, + .fifosize = 16, + .ops = &amba_pl010_pops, + .flags = ASYNC_BOOT_AUTOCONF, + .line = 0, + }, + .dtr_mask = 1 << 5, + .rts_mask = 1 << 4, + }, + { + .port = { + .membase = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE), + .mapbase = INTEGRATOR_UART1_BASE, + .iotype = SERIAL_IO_MEM, + .irq = IRQ_UARTINT1, + .uartclk = 14745600, + .fifosize = 16, + .ops = &amba_pl010_pops, + .flags = ASYNC_BOOT_AUTOCONF, + .line = 1, + }, + .dtr_mask = 1 << 7, + .rts_mask = 1 << 6, + } +}; + +#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE + +static void +pl010_console_write(struct console *co, const char *s, unsigned int count) +{ + struct uart_port *port = &amba_ports[co->index].port; + unsigned int status, old_cr; + int i; + + /* + * First save the CR then disable the interrupts + */ + old_cr = UART_GET_CR(port); + UART_PUT_CR(port, UART01x_CR_UARTEN); + + /* + * Now, do each character + */ + for (i = 0; i < count; i++) { + do { + status = UART_GET_FR(port); + } while (!UART_TX_READY(status)); + UART_PUT_CHAR(port, s[i]); + if (s[i] == '\n') { + do { + status = UART_GET_FR(port); + } while (!UART_TX_READY(status)); + UART_PUT_CHAR(port, '\r'); + } + } + + /* + * Finally, wait for transmitter to become empty + * and restore the TCR + */ + do { + status = UART_GET_FR(port); + } while (status & UART01x_FR_BUSY); + UART_PUT_CR(port, old_cr); +} + +static void __init +pl010_console_get_options(struct uart_port *port, int *baud, + int *parity, int *bits) +{ + if (UART_GET_CR(port) & UART01x_CR_UARTEN) { + unsigned int lcr_h, quot; + lcr_h = UART_GET_LCRH(port); + + *parity = 'n'; + if (lcr_h & UART01x_LCRH_PEN) { + if (lcr_h & UART01x_LCRH_EPS) + *parity = 'e'; + else + *parity = 'o'; + } + + if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7) + *bits = 7; + else + *bits = 8; + + quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8; + *baud = port->uartclk / (16 * (quot + 1)); + } +} + +static int __init pl010_console_setup(struct console *co, char *options) +{ + struct uart_port *port; + int baud = 38400; + int bits = 8; + int parity = 'n'; + int flow = 'n'; + + /* + * Check whether an invalid uart number has been specified, and + * if so, search for the first available port that does have + * console support. + */ + if (co->index >= UART_NR) + co->index = 0; + port = &amba_ports[co->index].port; + + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + else + pl010_console_get_options(port, &baud, &parity, &bits); + + return uart_set_options(port, co, baud, parity, bits, flow); +} + +extern struct uart_driver amba_reg; +static struct console amba_console = { + .name = "ttyAM", + .write = pl010_console_write, + .device = uart_console_device, + .setup = pl010_console_setup, + .flags = CON_PRINTBUFFER, + .index = -1, + .data = &amba_reg, +}; + +static int __init amba_console_init(void) +{ + /* + * All port initializations are done statically + */ + register_console(&amba_console); + return 0; +} +console_initcall(amba_console_init); + +static int __init amba_late_console_init(void) +{ + if (!(amba_console.flags & CON_ENABLED)) + register_console(&amba_console); + return 0; +} +late_initcall(amba_late_console_init); + +#define AMBA_CONSOLE &amba_console +#else +#define AMBA_CONSOLE NULL +#endif + +static struct uart_driver amba_reg = { + .owner = THIS_MODULE, + .driver_name = "ttyAM", + .dev_name = "ttyAM", + .major = SERIAL_AMBA_MAJOR, + .minor = SERIAL_AMBA_MINOR, + .nr = UART_NR, + .cons = AMBA_CONSOLE, +}; + +static int pl010_probe(struct amba_device *dev, void *id) +{ + int i; + + for (i = 0; i < UART_NR; i++) { + if (amba_ports[i].port.mapbase != dev->res.start) + continue; + + amba_ports[i].port.dev = &dev->dev; + uart_add_one_port(&amba_reg, &amba_ports[i].port); + amba_set_drvdata(dev, &amba_ports[i]); + break; + } + + return 0; +} + +static int pl010_remove(struct amba_device *dev) +{ + struct uart_amba_port *uap = amba_get_drvdata(dev); + + if (uap) + uart_remove_one_port(&amba_reg, &uap->port); + + amba_set_drvdata(dev, NULL); + + return 0; +} + +static int pl010_suspend(struct amba_device *dev, u32 state) +{ + struct uart_amba_port *uap = amba_get_drvdata(dev); + + if (uap) + uart_suspend_port(&amba_reg, &uap->port); + + return 0; +} + +static int pl010_resume(struct amba_device *dev) +{ + struct uart_amba_port *uap = amba_get_drvdata(dev); + + if (uap) + uart_resume_port(&amba_reg, &uap->port); + + return 0; +} + +static struct amba_id pl010_ids[] __initdata = { + { + .id = 0x00041010, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +static struct amba_driver pl010_driver = { + .drv = { + .name = "uart-pl010", + }, + .id_table = pl010_ids, + .probe = pl010_probe, + .remove = pl010_remove, + .suspend = pl010_suspend, + .resume = pl010_resume, +}; + +static int __init pl010_init(void) +{ + int ret; + + printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n"); + + ret = uart_register_driver(&amba_reg); + if (ret == 0) { + ret = amba_driver_register(&pl010_driver); + if (ret) + uart_unregister_driver(&amba_reg); + } + return ret; +} + +static void __exit pl010_exit(void) +{ + amba_driver_unregister(&pl010_driver); + uart_unregister_driver(&amba_reg); +} + +module_init(pl010_init); +module_exit(pl010_exit); + +MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd"); +MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $"); +MODULE_LICENSE("GPL"); |