/* * drivers/serial/mpc52xx_uart.c * * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs. * * FIXME According to the usermanual the status bits in the status register * are only updated when the peripherals access the FIFO and not when the * CPU access them. So since we use this bits to know when we stop writing * and reading, they may not be updated in-time and a race condition may * exists. But I haven't be able to prove this and I don't care. But if * any problem arises, it might worth checking. The TX/RX FIFO Stats * registers should be used in addition. * Update: Actually, they seem updated ... At least the bits we use. * * * Maintainer : Sylvain Munaut <tnt@246tNt.com> * * Some of the code has been inspired/copied from the 2.4 code written * by Dale Farnsworth <dfarnsworth@mvista.com>. * * Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com> * Copyright (C) 2003 MontaVista, Software, Inc. * * 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. */ /* Platform device Usage : * * Since PSCs can have multiple function, the correct driver for each one * is selected by calling mpc52xx_match_psc_function(...). The function * handled by this driver is "uart". * * The driver init all necessary registers to place the PSC in uart mode without * DCD. However, the pin multiplexing aren't changed and should be set either * by the bootloader or in the platform init code. * * The idx field must be equal to the PSC index ( e.g. 0 for PSC1, 1 for PSC2, * and so on). So the PSC1 is mapped to /dev/ttyS0, PSC2 to /dev/ttyS1 and so * on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly for * the console code : without this 1:1 mapping, at early boot time, when we are * parsing the kernel args console=ttyS?, we wouldn't know wich PSC it will be * mapped to. */ #include <linux/config.h> #include <linux/platform_device.h> #include <linux/module.h> #include <linux/tty.h> #include <linux/serial.h> #include <linux/sysrq.h> #include <linux/console.h> #include <asm/delay.h> #include <asm/io.h> #include <asm/mpc52xx.h> #include <asm/mpc52xx_psc.h> #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) #define SUPPORT_SYSRQ #endif #include <linux/serial_core.h> #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */ static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM]; /* Rem: - We use the read_status_mask as a shadow of * psc->mpc52xx_psc_imr * - It's important that is array is all zero on start as we * use it to know if it's initialized or not ! If it's not sure * it's cleared, then a memset(...,0,...) should be added to * the console_init */ #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase)) /* Forward declaration of the interruption handling routine */ static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id,struct pt_regs *regs); /* Simple macro to test if a port is console or not. This one is taken * for serial_core.c and maybe should be moved to serial_core.h ? */ #ifdef CONFIG_SERIAL_CORE_CONSOLE #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) #else #define uart_console(port) (0) #endif /* ======================================================================== */ /* UART operations */ /* ======================================================================== */ static unsigned int mpc52xx_uart_tx_empty(struct uart_port *port) { int status = in_be16(&PSC(port)->mpc52xx_psc_status); return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0; } static void mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) { /* Not implemented */ } static unsigned int mpc52xx_uart_get_mctrl(struct uart_port *port) { /* Not implemented */ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; } static void mpc52xx_uart_stop_tx(struct uart_port *port) { /* port->lock taken by caller */ port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY; out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } static void mpc52xx_uart_start_tx(struct uart_port *port) { /* port->lock taken by caller */ port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } static void mpc52xx_uart_send_xchar(struct uart_port *port, char ch) { unsigned long flags; spin_lock_irqsave(&port->lock, flags); port->x_char = ch; if (ch) { /* Make sure tx interrupts are on */ /* Truly necessary ??? They should be anyway */ port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } spin_unlock_irqrestore(&port->lock, flags); } static void mpc52xx_uart_stop_rx(struct uart_port *port) { /* port->lock taken by caller */ port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY; out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } static void mpc52xx_uart_enable_ms(struct uart_port *port) { /* Not implemented */ } static void mpc52xx_uart_break_ctl(struct uart_port *port, int ctl) { unsigned long flags; spin_lock_irqsave(&port->lock, flags); if ( ctl == -1 ) out_8(&PSC(port)->command,MPC52xx_PSC_START_BRK); else out_8(&PSC(port)->command,MPC52xx_PSC_STOP_BRK); spin_unlock_irqrestore(&port->lock, flags); } static int mpc52xx_uart_startup(struct uart_port *port) { struct mpc52xx_psc __iomem *psc = PSC(port); int ret; /* Request IRQ */ ret = request_irq(port->irq, mpc52xx_uart_int, SA_INTERRUPT | SA_SAMPLE_RANDOM, "mpc52xx_psc_uart", port); if (ret) return ret; /* Reset/activate the port, clear and enable interrupts */ out_8(&psc->command,MPC52xx_PSC_RST_RX); out_8(&psc->command,MPC52xx_PSC_RST_TX); out_be32(&psc->sicr,0); /* UART mode DCD ignored */ out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */ out_8(&psc->rfcntl, 0x00); out_be16(&psc->rfalarm, 0x1ff); out_8(&psc->tfcntl, 0x07); out_be16(&psc->tfalarm, 0x80); port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY; out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask); out_8(&psc->command,MPC52xx_PSC_TX_ENABLE); out_8(&psc->command,MPC52xx_PSC_RX_ENABLE); return 0; } static void mpc52xx_uart_shutdown(struct uart_port *port) { struct mpc52xx_psc __iomem *psc = PSC(port); /* Shut down the port, interrupt and all */ out_8(&psc->command,MPC52xx_PSC_RST_RX); out_8(&psc->command,MPC52xx_PSC_RST_TX); port->read_status_mask = 0; out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask); /* Release interrupt */ free_irq(port->irq, port); } static void mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, struct termios *old) { struct mpc52xx_psc __iomem *psc = PSC(port); unsigned long flags; unsigned char mr1, mr2; unsigned short ctr; unsigned int j, baud, quot; /* Prepare what we're gonna write */ mr1 = 0; switch (new->c_cflag & CSIZE) { case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS; break; case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS; break; case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS; break; case CS8: default: mr1 |= MPC52xx_PSC_MODE_8_BITS; } if (new->c_cflag & PARENB) { mr1 |= (new->c_cflag & PARODD) ? MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN; } else mr1 |= MPC52xx_PSC_MODE_PARNONE; mr2 = 0; if (new->c_cflag & CSTOPB) mr2 |= MPC52xx_PSC_MODE_TWO_STOP; else mr2 |= ((new->c_cflag & CSIZE) == CS5) ? MPC52xx_PSC_MODE_ONE_STOP_5_BITS : MPC52xx_PSC_MODE_ONE_STOP; baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16); quot = uart_get_divisor(port, baud); ctr = quot & 0xffff; /* Get the lock */ spin_lock_irqsave(&port->lock, flags); /* Update the per-port timeout */ uart_update_timeout(port, new->c_cflag, baud); /* Do our best to flush TX & RX, so we don't loose anything */ /* But we don't wait indefinitly ! */ j = 5000000; /* Maximum wait */ /* FIXME Can't receive chars since set_termios might be called at early * boot for the console, all stuff is not yet ready to receive at that * time and that just makes the kernel oops */ /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */ while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && --j) udelay(1); if (!j) printk( KERN_ERR "mpc52xx_uart.c: " "Unable to flush RX & TX fifos in-time in set_termios." "Some chars may have been lost.\n" ); /* Reset the TX & RX */ out_8(&psc->command,MPC52xx_PSC_RST_RX); out_8(&psc->command,MPC52xx_PSC_RST_TX); /* Send new mode settings */ out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1); out_8(&psc->mode,mr1); out_8(&psc->mode,mr2); out_8(&psc->ctur,ctr >> 8); out_8(&psc->ctlr,ctr & 0xff); /* Reenable TX & RX */ out_8(&psc->command,MPC52xx_PSC_TX_ENABLE); out_8(&psc->command,MPC52xx_PSC_RX_ENABLE); /* We're all set, release the lock */ spin_unlock_irqrestore(&port->lock, flags); } static const char * mpc52xx_uart_type(struct uart_port *port) { return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL; } static void mpc52xx_uart_release_port(struct uart_port *port) { if (port->flags & UPF_IOREMAP) { /* remapped by us ? */ iounmap(port->membase); port->membase = NULL; } release_mem_region(port->mapbase, MPC52xx_PSC_SIZE); } static int mpc52xx_uart_request_port(struct uart_port *port) { if (port->flags & UPF_IOREMAP) /* Need to remap ? */ port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE); if (!port->membase) return -EINVAL; return request_mem_region(port->mapbase, MPC52xx_PSC_SIZE, "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY; } static void mpc52xx_uart_config_port(struct uart_port *port, int flags) { if ( (flags & UART_CONFIG_TYPE) && (mpc52xx_uart_request_port(port) == 0) ) port->type = PORT_MPC52xx; } static int mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser) { if ( ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx ) return -EINVAL; if ( (ser->irq != port->irq) || (ser->io_type != SERIAL_IO_MEM) || (ser->baud_base != port->uartclk) || (ser->iomem_base != (void*)port->mapbase) || (ser->hub6 != 0 ) ) return -EINVAL; return 0; } static struct uart_ops mpc52xx_uart_ops = { .tx_empty = mpc52xx_uart_tx_empty, .set_mctrl = mpc52xx_uart_set_mctrl, .get_mctrl = mpc52xx_uart_get_mctrl, .stop_tx = mpc52xx_uart_stop_tx, .start_tx = mpc52xx_uart_start_tx, .send_xchar = mpc52xx_uart_send_xchar, .stop_rx = mpc52xx_uart_stop_rx, .enable_ms = mpc52xx_uart_enable_ms, .break_ctl = mpc52xx_uart_break_ctl, .startup = mpc52xx_uart_startup, .shutdown = mpc52xx_uart_shutdown, .set_termios = mpc52xx_uart_set_termios, /* .pm = mpc52xx_uart_pm, Not supported yet */ /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */ .type = mpc52xx_uart_type, .release_port = mpc52xx_uart_release_port, .request_port = mpc52xx_uart_request_port, .config_port = mpc52xx_uart_config_port, .verify_port = mpc52xx_uart_verify_port }; /* ======================================================================== */ /* Interrupt handling */ /* ======================================================================== */ static inline int mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs) { struct tty_struct *tty = port->info->tty; unsigned char ch; unsigned short status; /* While we can read, do so ! */ while ( (status = in_be16(&PSC(port)->mpc52xx_psc_status)) & MPC52xx_PSC_SR_RXRDY) { /* If we are full, just stop reading */ if (tty->flip.count >= TTY_FLIPBUF_SIZE) break; /* Get the char */ ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8); /* Handle sysreq char */ #ifdef SUPPORT_SYSRQ if (uart_handle_sysrq_char(port, ch, regs)) { port->sysrq = 0; continue; } #endif /* Store it */ *tty->flip.char_buf_ptr = ch; *tty->flip.flag_buf_ptr = 0; port->icount.rx++; if ( status & (MPC52xx_PSC_SR_PE | MPC52xx_PSC_SR_FE | MPC52xx_PSC_SR_RB | MPC52xx_PSC_SR_OE) ) { if (status & MPC52xx_PSC_SR_RB) { *tty->flip.flag_buf_ptr = TTY_BREAK; uart_handle_break(port); } else if (status & MPC52xx_PSC_SR_PE) *tty->flip.flag_buf_ptr = TTY_PARITY; else if (status & MPC52xx_PSC_SR_FE) *tty->flip.flag_buf_ptr = TTY_FRAME; if (status & MPC52xx_PSC_SR_OE) { /* * Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ if (tty->flip.count < (TTY_FLIPBUF_SIZE-1)) { tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; tty->flip.count++; } *tty->flip.flag_buf_ptr = TTY_OVERRUN; } /* Clear error condition */ out_8(&PSC(port)->command,MPC52xx_PSC_RST_ERR_STAT); } tty->flip.char_buf_ptr++; tty->flip.flag_buf_ptr++; tty->flip.count++; } tty_flip_buffer_push(tty); return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY; } static inline int mpc52xx_uart_int_tx_chars(struct uart_port *port) { struct circ_buf *xmit = &port->info->xmit; /* Process out of band chars */ if (port->x_char) { out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char); port->icount.tx++; port->x_char = 0; return 1; } /* Nothing to do ? */ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { mpc52xx_uart_stop_tx(port); return 0; } /* Send chars */ while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) { out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; if (uart_circ_empty(xmit)) break; } /* Wake up */ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); /* Maybe we're done after all */ if (uart_circ_empty(xmit)) { mpc52xx_uart_stop_tx(port); return 0; } return 1; } static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs) { struct uart_port *port = (struct uart_port *) dev_id; unsigned long pass = ISR_PASS_LIMIT; unsigned int keepgoing; unsigned short status; if ( irq != port->irq ) { printk( KERN_WARNING "mpc52xx_uart_int : " \ "Received wrong int %d. Waiting for %d\n", irq, port->irq); return IRQ_NONE; } spin_lock(&port->lock); /* While we have stuff to do, we continue */ do { /* If we don't find anything to do, we stop */ keepgoing = 0; /* Read status */ status = in_be16(&PSC(port)->mpc52xx_psc_isr); status &= port->read_status_mask; /* Do we need to receive chars ? */ /* For this RX interrupts must be on and some chars waiting */ if ( status & MPC52xx_PSC_IMR_RXRDY ) keepgoing |= mpc52xx_uart_int_rx_chars(port, regs); /* Do we need to send chars ? */ /* For this, TX must be ready and TX interrupt enabled */ if ( status & MPC52xx_PSC_IMR_TXRDY ) keepgoing |= mpc52xx_uart_int_tx_chars(port); /* Limit number of iteration */ if ( !(--pass) ) keepgoing = 0; } while (keepgoing); spin_unlock(&port->lock); return IRQ_HANDLED; } /* ======================================================================== */ /* Console ( if applicable ) */ /* ======================================================================== */ #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE static void __init mpc52xx_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits, int *flow) { struct mpc52xx_psc __iomem *psc = PSC(port); unsigned char mr1; /* Read the mode registers */ out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1); mr1 = in_8(&psc->mode); /* CT{U,L}R are write-only ! */ *baud = __res.bi_baudrate ? __res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; /* Parse them */ switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) { case MPC52xx_PSC_MODE_5_BITS: *bits = 5; break; case MPC52xx_PSC_MODE_6_BITS: *bits = 6; break; case MPC52xx_PSC_MODE_7_BITS: *bits = 7; break; case MPC52xx_PSC_MODE_8_BITS: default: *bits = 8; } if (mr1 & MPC52xx_PSC_MODE_PARNONE) *parity = 'n'; else *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e'; } static void mpc52xx_console_write(struct console *co, const char *s, unsigned int count) { struct uart_port *port = &mpc52xx_uart_ports[co->index]; struct mpc52xx_psc __iomem *psc = PSC(port); unsigned int i, j; /* Disable interrupts */ out_be16(&psc->mpc52xx_psc_imr, 0); /* Wait the TX buffer to be empty */ j = 5000000; /* Maximum wait */ while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && --j) udelay(1); /* Write all the chars */ for ( i=0 ; i<count ; i++ ) { /* Send the char */ out_8(&psc->mpc52xx_psc_buffer_8, *s); /* Line return handling */ if ( *s++ == '\n' ) out_8(&psc->mpc52xx_psc_buffer_8, '\r'); /* Wait the TX buffer to be empty */ j = 20000; /* Maximum wait */ while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && --j) udelay(1); } /* Restore interrupt state */ out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); } static int __init mpc52xx_console_setup(struct console *co, char *options) { struct uart_port *port = &mpc52xx_uart_ports[co->index]; int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; int bits = 8; int parity = 'n'; int flow = 'n'; if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM) return -EINVAL; /* Basic port init. Needed since we use some uart_??? func before * real init for early access */ spin_lock_init(&port->lock); port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */ port->ops = &mpc52xx_uart_ops; port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1)); /* We ioremap ourself */ port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE); if (port->membase == NULL) return -EINVAL; /* Setup the port parameters accoding to options */ if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow); return uart_set_options(port, co, baud, parity, bits, flow); } extern struct uart_driver mpc52xx_uart_driver; static struct console mpc52xx_console = { .name = "ttyS", .write = mpc52xx_console_write, .device = uart_console_device, .setup = mpc52xx_console_setup, .flags = CON_PRINTBUFFER, .index = -1, /* Specified on the cmdline (e.g. console=ttyS0 ) */ .data = &mpc52xx_uart_driver, }; static int __init mpc52xx_console_init(void) { register_console(&mpc52xx_console); return 0; } console_initcall(mpc52xx_console_init); #define MPC52xx_PSC_CONSOLE &mpc52xx_console #else #define MPC52xx_PSC_CONSOLE NULL #endif /* ======================================================================== */ /* UART Driver */ /* ======================================================================== */ static struct uart_driver mpc52xx_uart_driver = { .owner = THIS_MODULE, .driver_name = "mpc52xx_psc_uart", .dev_name = "ttyS", .devfs_name = "ttyS", .major = TTY_MAJOR, .minor = 64, .nr = MPC52xx_PSC_MAXNUM, .cons = MPC52xx_PSC_CONSOLE, }; /* ======================================================================== */ /* Platform Driver */ /* ======================================================================== */ static int __devinit mpc52xx_uart_probe(struct platform_device *dev) { struct resource *res = dev->resource; struct uart_port *port = NULL; int i, idx, ret; /* Check validity & presence */ idx = dev->id; if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM) return -EINVAL; if (!mpc52xx_match_psc_function(idx,"uart")) return -ENODEV; /* Init the port structure */ port = &mpc52xx_uart_ports[idx]; memset(port, 0x00, sizeof(struct uart_port)); spin_lock_init(&port->lock); port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */ port->fifosize = 255; /* Should be 512 ! But it can't be */ /* stored in a unsigned char */ port->iotype = UPIO_MEM; port->flags = UPF_BOOT_AUTOCONF | ( uart_console(port) ? 0 : UPF_IOREMAP ); port->line = idx; port->ops = &mpc52xx_uart_ops; /* Search for IRQ and mapbase */ for (i=0 ; i<dev->num_resources ; i++, res++) { if (res->flags & IORESOURCE_MEM) port->mapbase = res->start; else if (res->flags & IORESOURCE_IRQ) port->irq = res->start; } if (!port->irq || !port->mapbase) return -EINVAL; /* Add the port to the uart sub-system */ ret = uart_add_one_port(&mpc52xx_uart_driver, port); if (!ret) platform_set_drvdata(dev, (void*)port); return ret; } static int mpc52xx_uart_remove(struct platform_device *dev) { struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); platform_set_drvdata(dev, NULL); if (port) uart_remove_one_port(&mpc52xx_uart_driver, port); return 0; } #ifdef CONFIG_PM static int mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state) { struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); if (sport) uart_suspend_port(&mpc52xx_uart_driver, port); return 0; } static int mpc52xx_uart_resume(struct platform_device *dev) { struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); if (port) uart_resume_port(&mpc52xx_uart_driver, port); return 0; } #endif static struct platform_driver mpc52xx_uart_platform_driver = { .probe = mpc52xx_uart_probe, .remove = mpc52xx_uart_remove, #ifdef CONFIG_PM .suspend = mpc52xx_uart_suspend, .resume = mpc52xx_uart_resume, #endif .driver = { .name = "mpc52xx-psc", }, }; /* ======================================================================== */ /* Module */ /* ======================================================================== */ static int __init mpc52xx_uart_init(void) { int ret; printk(KERN_INFO "Serial: MPC52xx PSC driver\n"); ret = uart_register_driver(&mpc52xx_uart_driver); if (ret == 0) { ret = platform_driver_register(&mpc52xx_uart_platform_driver); if (ret) uart_unregister_driver(&mpc52xx_uart_driver); } return ret; } static void __exit mpc52xx_uart_exit(void) { platform_driver_unregister(&mpc52xx_uart_platform_driver); uart_unregister_driver(&mpc52xx_uart_driver); } module_init(mpc52xx_uart_init); module_exit(mpc52xx_uart_exit); MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); MODULE_DESCRIPTION("Freescale MPC52xx PSC UART"); MODULE_LICENSE("GPL");