/* * UART driver for PNX8XXX SoCs * * Author: Per Hallsmark per.hallsmark@mvista.com * Ported to 2.6 kernel by EmbeddedAlley * Reworked by Vitaly Wool <vitalywool@gmail.com> * * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. * Copyright (C) 2000 Deep Blue Solutions Ltd. * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of * any kind, whether express or implied. * */ #if defined(CONFIG_SERIAL_PNX8XXX_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/platform_device.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/serial_pnx8xxx.h> #include <asm/io.h> #include <asm/irq.h> /* We'll be using StrongARM sa1100 serial port major/minor */ #define SERIAL_PNX8XXX_MAJOR 204 #define MINOR_START 5 #define NR_PORTS 2 #define PNX8XXX_ISR_PASS_LIMIT 256 /* * Convert from ignore_status_mask or read_status_mask to FIFO * and interrupt status bits */ #define SM_TO_FIFO(x) ((x) >> 10) #define SM_TO_ISTAT(x) ((x) & 0x000001ff) #define FIFO_TO_SM(x) ((x) << 10) #define ISTAT_TO_SM(x) ((x) & 0x000001ff) /* * This is the size of our serial port register set. */ #define UART_PORT_SIZE 0x1000 /* * This determines how often we check the modem status signals * for any change. They generally aren't connected to an IRQ * so we have to poll them. We also check immediately before * filling the TX fifo incase CTS has been dropped. */ #define MCTRL_TIMEOUT (250*HZ/1000) extern struct pnx8xxx_port pnx8xxx_ports[]; static inline int serial_in(struct pnx8xxx_port *sport, int offset) { return (__raw_readl(sport->port.membase + offset)); } static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value) { __raw_writel(value, sport->port.membase + offset); } /* * Handle any change of modem status signal since we were last called. */ static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport) { unsigned int status, changed; status = sport->port.ops->get_mctrl(&sport->port); changed = status ^ sport->old_status; if (changed == 0) return; sport->old_status = status; if (changed & TIOCM_RI) sport->port.icount.rng++; if (changed & TIOCM_DSR) sport->port.icount.dsr++; if (changed & TIOCM_CAR) uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); if (changed & TIOCM_CTS) uart_handle_cts_change(&sport->port, status & TIOCM_CTS); wake_up_interruptible(&sport->port.info->delta_msr_wait); } /* * This is our per-port timeout handler, for checking the * modem status signals. */ static void pnx8xxx_timeout(unsigned long data) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)data; unsigned long flags; if (sport->port.info) { spin_lock_irqsave(&sport->port.lock, flags); pnx8xxx_mctrl_check(sport); spin_unlock_irqrestore(&sport->port.lock, flags); mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); } } /* * interrupts disabled on entry */ static void pnx8xxx_stop_tx(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; u32 ien; /* Disable TX intr */ ien = serial_in(sport, PNX8XXX_IEN); serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX); /* Clear all pending TX intr */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX); } /* * interrupts may not be disabled on entry */ static void pnx8xxx_start_tx(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; u32 ien; /* Clear all pending TX intr */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX); /* Enable TX intr */ ien = serial_in(sport, PNX8XXX_IEN); serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX); } /* * Interrupts enabled */ static void pnx8xxx_stop_rx(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; u32 ien; /* Disable RX intr */ ien = serial_in(sport, PNX8XXX_IEN); serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX); /* Clear all pending RX intr */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX); } /* * Set the modem control timer to fire immediately. */ static void pnx8xxx_enable_ms(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; mod_timer(&sport->timer, jiffies); } static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport) { struct tty_struct *tty = sport->port.info->port.tty; unsigned int status, ch, flg; status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) | ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT)); while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) { ch = serial_in(sport, PNX8XXX_FIFO); sport->port.icount.rx++; flg = TTY_NORMAL; /* * note that the error handling code is * out of the main execution path */ if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE | PNX8XXX_UART_FIFO_RXPAR) | ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) { if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR)) sport->port.icount.parity++; else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE)) sport->port.icount.frame++; if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN)) sport->port.icount.overrun++; status &= sport->port.read_status_mask; if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR)) flg = TTY_PARITY; else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE)) flg = TTY_FRAME; #ifdef SUPPORT_SYSRQ sport->port.sysrq = 0; #endif } if (uart_handle_sysrq_char(&sport->port, ch)) goto ignore_char; uart_insert_char(&sport->port, status, ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg); ignore_char: serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) | PNX8XXX_UART_LCR_RX_NEXT); status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) | ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT)); } tty_flip_buffer_push(tty); } static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport) { struct circ_buf *xmit = &sport->port.info->xmit; if (sport->port.x_char) { serial_out(sport, PNX8XXX_FIFO, sport->port.x_char); sport->port.icount.tx++; sport->port.x_char = 0; return; } /* * Check the modem control lines before * transmitting anything. */ pnx8xxx_mctrl_check(sport); if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { pnx8xxx_stop_tx(&sport->port); return; } /* * TX while bytes available */ while (((serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) { serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); sport->port.icount.tx++; if (uart_circ_empty(xmit)) break; } if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); if (uart_circ_empty(xmit)) pnx8xxx_stop_tx(&sport->port); } static irqreturn_t pnx8xxx_int(int irq, void *dev_id) { struct pnx8xxx_port *sport = dev_id; unsigned int status; spin_lock(&sport->port.lock); /* Get the interrupts */ status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN); /* Break signal received */ if (status & PNX8XXX_UART_INT_BREAK) { sport->port.icount.brk++; uart_handle_break(&sport->port); } /* Byte received */ if (status & PNX8XXX_UART_INT_RX) pnx8xxx_rx_chars(sport); /* TX holding register empty - transmit a byte */ if (status & PNX8XXX_UART_INT_TX) pnx8xxx_tx_chars(sport); /* Clear the ISTAT register */ serial_out(sport, PNX8XXX_ICLR, status); spin_unlock(&sport->port.lock); return IRQ_HANDLED; } /* * Return TIOCSER_TEMT when transmitter is not busy. */ static unsigned int pnx8xxx_tx_empty(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT; } static unsigned int pnx8xxx_get_mctrl(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; unsigned int mctrl = TIOCM_DSR; unsigned int msr; /* REVISIT */ msr = serial_in(sport, PNX8XXX_MCR); mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0; mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0; return mctrl; } static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl) { #if 0 /* FIXME */ struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; unsigned int msr; #endif } /* * Interrupts always disabled. */ static void pnx8xxx_break_ctl(struct uart_port *port, int break_state) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; unsigned long flags; unsigned int lcr; spin_lock_irqsave(&sport->port.lock, flags); lcr = serial_in(sport, PNX8XXX_LCR); if (break_state == -1) lcr |= PNX8XXX_UART_LCR_TXBREAK; else lcr &= ~PNX8XXX_UART_LCR_TXBREAK; serial_out(sport, PNX8XXX_LCR, lcr); spin_unlock_irqrestore(&sport->port.lock, flags); } static int pnx8xxx_startup(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; int retval; /* * Allocate the IRQ */ retval = request_irq(sport->port.irq, pnx8xxx_int, 0, "pnx8xxx-uart", sport); if (retval) return retval; /* * Finally, clear and enable interrupts */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX | PNX8XXX_UART_INT_ALLTX); serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) | PNX8XXX_UART_INT_ALLRX | PNX8XXX_UART_INT_ALLTX); /* * Enable modem status interrupts */ spin_lock_irq(&sport->port.lock); pnx8xxx_enable_ms(&sport->port); spin_unlock_irq(&sport->port.lock); return 0; } static void pnx8xxx_shutdown(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; int lcr; /* * Stop our timer. */ del_timer_sync(&sport->timer); /* * Disable all interrupts */ serial_out(sport, PNX8XXX_IEN, 0); /* * Reset the Tx and Rx FIFOS, disable the break condition */ lcr = serial_in(sport, PNX8XXX_LCR); lcr &= ~PNX8XXX_UART_LCR_TXBREAK; lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST; serial_out(sport, PNX8XXX_LCR, lcr); /* * Clear all interrupts */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX | PNX8XXX_UART_INT_ALLTX); /* * Free the interrupt */ free_irq(sport->port.irq, sport); } static void pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; unsigned long flags; unsigned int lcr_fcr, old_ien, baud, quot; unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; /* * We only support CS7 and CS8. */ while ((termios->c_cflag & CSIZE) != CS7 && (termios->c_cflag & CSIZE) != CS8) { termios->c_cflag &= ~CSIZE; termios->c_cflag |= old_csize; old_csize = CS8; } if ((termios->c_cflag & CSIZE) == CS8) lcr_fcr = PNX8XXX_UART_LCR_8BIT; else lcr_fcr = 0; if (termios->c_cflag & CSTOPB) lcr_fcr |= PNX8XXX_UART_LCR_2STOPB; if (termios->c_cflag & PARENB) { lcr_fcr |= PNX8XXX_UART_LCR_PAREN; if (!(termios->c_cflag & PARODD)) lcr_fcr |= PNX8XXX_UART_LCR_PAREVN; } /* * 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); spin_lock_irqsave(&sport->port.lock, flags); sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) | ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) | ISTAT_TO_SM(PNX8XXX_UART_INT_RX); if (termios->c_iflag & INPCK) sport->port.read_status_mask |= FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR); if (termios->c_iflag & (BRKINT | PARMRK)) sport->port.read_status_mask |= ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK); /* * Characters to ignore */ sport->port.ignore_status_mask = 0; if (termios->c_iflag & IGNPAR) sport->port.ignore_status_mask |= FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR); if (termios->c_iflag & IGNBRK) { sport->port.ignore_status_mask |= ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK); /* * If we're ignoring parity and break indicators, * ignore overruns too (for real raw support). */ if (termios->c_iflag & IGNPAR) sport->port.ignore_status_mask |= ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN); } /* * ignore all characters if CREAD is not set */ if ((termios->c_cflag & CREAD) == 0) sport->port.ignore_status_mask |= ISTAT_TO_SM(PNX8XXX_UART_INT_RX); del_timer_sync(&sport->timer); /* * Update the per-port timeout. */ uart_update_timeout(port, termios->c_cflag, baud); /* * disable interrupts and drain transmitter */ old_ien = serial_in(sport, PNX8XXX_IEN); serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX | PNX8XXX_UART_INT_ALLRX)); while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA) barrier(); /* then, disable everything */ serial_out(sport, PNX8XXX_IEN, 0); /* Reset the Rx and Tx FIFOs too */ lcr_fcr |= PNX8XXX_UART_LCR_TX_RST; lcr_fcr |= PNX8XXX_UART_LCR_RX_RST; /* set the parity, stop bits and data size */ serial_out(sport, PNX8XXX_LCR, lcr_fcr); /* set the baud rate */ quot -= 1; serial_out(sport, PNX8XXX_BAUD, quot); serial_out(sport, PNX8XXX_ICLR, -1); serial_out(sport, PNX8XXX_IEN, old_ien); if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) pnx8xxx_enable_ms(&sport->port); spin_unlock_irqrestore(&sport->port.lock, flags); } static const char *pnx8xxx_type(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL; } /* * Release the memory region(s) being used by 'port'. */ static void pnx8xxx_release_port(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; release_mem_region(sport->port.mapbase, UART_PORT_SIZE); } /* * Request the memory region(s) being used by 'port'. */ static int pnx8xxx_request_port(struct uart_port *port) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; return request_mem_region(sport->port.mapbase, UART_PORT_SIZE, "pnx8xxx-uart") != NULL ? 0 : -EBUSY; } /* * Configure/autoconfigure the port. */ static void pnx8xxx_config_port(struct uart_port *port, int flags) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; if (flags & UART_CONFIG_TYPE && pnx8xxx_request_port(&sport->port) == 0) sport->port.type = PORT_PNX8XXX; } /* * Verify the new serial_struct (for TIOCSSERIAL). * The only change we allow are to the flags and type, and * even then only between PORT_PNX8XXX and PORT_UNKNOWN */ static int pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; int ret = 0; if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX) ret = -EINVAL; if (sport->port.irq != ser->irq) ret = -EINVAL; if (ser->io_type != SERIAL_IO_MEM) ret = -EINVAL; if (sport->port.uartclk / 16 != ser->baud_base) ret = -EINVAL; if ((void *)sport->port.mapbase != ser->iomem_base) ret = -EINVAL; if (sport->port.iobase != ser->port) ret = -EINVAL; if (ser->hub6 != 0) ret = -EINVAL; return ret; } static struct uart_ops pnx8xxx_pops = { .tx_empty = pnx8xxx_tx_empty, .set_mctrl = pnx8xxx_set_mctrl, .get_mctrl = pnx8xxx_get_mctrl, .stop_tx = pnx8xxx_stop_tx, .start_tx = pnx8xxx_start_tx, .stop_rx = pnx8xxx_stop_rx, .enable_ms = pnx8xxx_enable_ms, .break_ctl = pnx8xxx_break_ctl, .startup = pnx8xxx_startup, .shutdown = pnx8xxx_shutdown, .set_termios = pnx8xxx_set_termios, .type = pnx8xxx_type, .release_port = pnx8xxx_release_port, .request_port = pnx8xxx_request_port, .config_port = pnx8xxx_config_port, .verify_port = pnx8xxx_verify_port, }; /* * Setup the PNX8XXX serial ports. * * Note also that we support "console=ttySx" where "x" is either 0 or 1. */ static void __init pnx8xxx_init_ports(void) { static int first = 1; int i; if (!first) return; first = 0; for (i = 0; i < NR_PORTS; i++) { init_timer(&pnx8xxx_ports[i].timer); pnx8xxx_ports[i].timer.function = pnx8xxx_timeout; pnx8xxx_ports[i].timer.data = (unsigned long)&pnx8xxx_ports[i]; pnx8xxx_ports[i].port.ops = &pnx8xxx_pops; } } #ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE static void pnx8xxx_console_putchar(struct uart_port *port, int ch) { struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; int status; do { /* Wait for UART_TX register to empty */ status = serial_in(sport, PNX8XXX_FIFO); } while (status & PNX8XXX_UART_FIFO_TXFIFO); serial_out(sport, PNX8XXX_FIFO, ch); } /* * Interrupts are disabled on entering */static void pnx8xxx_console_write(struct console *co, const char *s, unsigned int count) { struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index]; unsigned int old_ien, status; /* * First, save IEN and then disable interrupts */ old_ien = serial_in(sport, PNX8XXX_IEN); serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX | PNX8XXX_UART_INT_ALLRX)); uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar); /* * Finally, wait for transmitter to become empty * and restore IEN */ do { /* Wait for UART_TX register to empty */ status = serial_in(sport, PNX8XXX_FIFO); } while (status & PNX8XXX_UART_FIFO_TXFIFO); /* Clear TX and EMPTY interrupt */ serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX | PNX8XXX_UART_INT_EMPTY); serial_out(sport, PNX8XXX_IEN, old_ien); } static int __init pnx8xxx_console_setup(struct console *co, char *options) { struct pnx8xxx_port *sport; 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 == -1 || co->index >= NR_PORTS) co->index = 0; sport = &pnx8xxx_ports[co->index]; if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); return uart_set_options(&sport->port, co, baud, parity, bits, flow); } static struct uart_driver pnx8xxx_reg; static struct console pnx8xxx_console = { .name = "ttyS", .write = pnx8xxx_console_write, .device = uart_console_device, .setup = pnx8xxx_console_setup, .flags = CON_PRINTBUFFER, .index = -1, .data = &pnx8xxx_reg, }; static int __init pnx8xxx_rs_console_init(void) { pnx8xxx_init_ports(); register_console(&pnx8xxx_console); return 0; } console_initcall(pnx8xxx_rs_console_init); #define PNX8XXX_CONSOLE &pnx8xxx_console #else #define PNX8XXX_CONSOLE NULL #endif static struct uart_driver pnx8xxx_reg = { .owner = THIS_MODULE, .driver_name = "ttyS", .dev_name = "ttyS", .major = SERIAL_PNX8XXX_MAJOR, .minor = MINOR_START, .nr = NR_PORTS, .cons = PNX8XXX_CONSOLE, }; static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state) { struct pnx8xxx_port *sport = platform_get_drvdata(pdev); return uart_suspend_port(&pnx8xxx_reg, &sport->port); } static int pnx8xxx_serial_resume(struct platform_device *pdev) { struct pnx8xxx_port *sport = platform_get_drvdata(pdev); return uart_resume_port(&pnx8xxx_reg, &sport->port); } static int pnx8xxx_serial_probe(struct platform_device *pdev) { struct resource *res = pdev->resource; int i; for (i = 0; i < pdev->num_resources; i++, res++) { if (!(res->flags & IORESOURCE_MEM)) continue; for (i = 0; i < NR_PORTS; i++) { if (pnx8xxx_ports[i].port.mapbase != res->start) continue; pnx8xxx_ports[i].port.dev = &pdev->dev; uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port); platform_set_drvdata(pdev, &pnx8xxx_ports[i]); break; } } return 0; } static int pnx8xxx_serial_remove(struct platform_device *pdev) { struct pnx8xxx_port *sport = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); if (sport) uart_remove_one_port(&pnx8xxx_reg, &sport->port); return 0; } static struct platform_driver pnx8xxx_serial_driver = { .driver = { .name = "pnx8xxx-uart", .owner = THIS_MODULE, }, .probe = pnx8xxx_serial_probe, .remove = pnx8xxx_serial_remove, .suspend = pnx8xxx_serial_suspend, .resume = pnx8xxx_serial_resume, }; static int __init pnx8xxx_serial_init(void) { int ret; printk(KERN_INFO "Serial: PNX8XXX driver\n"); pnx8xxx_init_ports(); ret = uart_register_driver(&pnx8xxx_reg); if (ret == 0) { ret = platform_driver_register(&pnx8xxx_serial_driver); if (ret) uart_unregister_driver(&pnx8xxx_reg); } return ret; } static void __exit pnx8xxx_serial_exit(void) { platform_driver_unregister(&pnx8xxx_serial_driver); uart_unregister_driver(&pnx8xxx_reg); } module_init(pnx8xxx_serial_init); module_exit(pnx8xxx_serial_exit); MODULE_AUTHOR("Embedded Alley Solutions, Inc."); MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR); MODULE_ALIAS("platform:pnx8xxx-uart");