diff options
| -rw-r--r-- | drivers/serial/mpc52xx_uart.c | 116 |
1 files changed, 57 insertions, 59 deletions
diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c index 4f80c5b4a753..8e24133166af 100644 --- a/drivers/serial/mpc52xx_uart.c +++ b/drivers/serial/mpc52xx_uart.c @@ -1,6 +1,4 @@ /* - * 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 @@ -14,18 +12,18 @@ * * * 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 @@ -101,27 +99,27 @@ static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id); /* UART operations */ /* ======================================================================== */ -static unsigned int +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 +static void mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) { /* Not implemented */ } -static unsigned int +static unsigned int mpc52xx_uart_get_mctrl(struct uart_port *port) { /* Not implemented */ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; } -static void +static void mpc52xx_uart_stop_tx(struct uart_port *port) { /* port->lock taken by caller */ @@ -129,7 +127,7 @@ mpc52xx_uart_stop_tx(struct uart_port *port) out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } -static void +static void mpc52xx_uart_start_tx(struct uart_port *port) { /* port->lock taken by caller */ @@ -137,12 +135,12 @@ mpc52xx_uart_start_tx(struct uart_port *port) out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); } -static void +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 */ @@ -150,7 +148,7 @@ mpc52xx_uart_send_xchar(struct uart_port *port, char ch) 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); } @@ -178,7 +176,7 @@ mpc52xx_uart_break_ctl(struct uart_port *port, int ctl) 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); } @@ -197,11 +195,11 @@ mpc52xx_uart_startup(struct uart_port *port) /* 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); @@ -209,10 +207,10 @@ mpc52xx_uart_startup(struct uart_port *port) 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; } @@ -220,19 +218,19 @@ 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; + + port->read_status_mask = 0; out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask); /* Release interrupt */ free_irq(port->irq, port); } -static void +static void mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, struct termios *old) { @@ -241,10 +239,10 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, 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; @@ -261,8 +259,8 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN; } else mr1 |= MPC52xx_PSC_MODE_PARNONE; - - + + mr2 = 0; if (new->c_cflag & CSTOPB) @@ -276,7 +274,7 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, 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); @@ -290,14 +288,14 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, * 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) && + 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" ); + "Some chars may have been lost.\n" ); /* Reset the TX & RX */ out_8(&psc->command,MPC52xx_PSC_RST_RX); @@ -309,7 +307,7 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, 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); @@ -373,7 +371,7 @@ mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser) if ( (ser->irq != port->irq) || (ser->io_type != SERIAL_IO_MEM) || - (ser->baud_base != port->uartclk) || + (ser->baud_base != port->uartclk) || (ser->iomem_base != (void*)port->mapbase) || (ser->hub6 != 0 ) ) return -EINVAL; @@ -404,11 +402,11 @@ static struct uart_ops mpc52xx_uart_ops = { .verify_port = mpc52xx_uart_verify_port }; - + /* ======================================================================== */ /* Interrupt handling */ /* ======================================================================== */ - + static inline int mpc52xx_uart_int_rx_chars(struct uart_port *port) { @@ -435,11 +433,11 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port) flag = TTY_NORMAL; port->icount.rx++; - + if ( status & (MPC52xx_PSC_SR_PE | MPC52xx_PSC_SR_FE | MPC52xx_PSC_SR_RB) ) { - + if (status & MPC52xx_PSC_SR_RB) { flag = TTY_BREAK; uart_handle_break(port); @@ -464,7 +462,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port) } tty_flip_buffer_push(tty); - + return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY; } @@ -509,25 +507,25 @@ mpc52xx_uart_int_tx_chars(struct uart_port *port) return 1; } -static irqreturn_t +static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id) { struct uart_port *port = dev_id; unsigned long pass = ISR_PASS_LIMIT; unsigned int keepgoing; unsigned short status; - + 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; - + 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 ) @@ -537,15 +535,15 @@ mpc52xx_uart_int(int irq, void *dev_id) /* 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; } @@ -566,7 +564,7 @@ mpc52xx_console_get_options(struct uart_port *port, /* 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; @@ -579,26 +577,26 @@ mpc52xx_console_get_options(struct uart_port *port, 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 +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 = 5000000; /* Maximum wait */ + while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && --j) udelay(1); @@ -607,13 +605,13 @@ mpc52xx_console_write(struct console *co, const char *s, unsigned int count) /* Line return handling */ if (*s == '\n') out_8(&psc->mpc52xx_psc_buffer_8, '\r'); - + /* Send the char */ out_8(&psc->mpc52xx_psc_buffer_8, *s); /* Wait the TX buffer to be empty */ - j = 20000; /* Maximum wait */ - while (!(in_be16(&psc->mpc52xx_psc_status) & + j = 20000; /* Maximum wait */ + while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && --j) udelay(1); } @@ -634,7 +632,7 @@ mpc52xx_console_setup(struct console *co, char *options) 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); @@ -669,8 +667,8 @@ static struct console mpc52xx_console = { .data = &mpc52xx_uart_driver, }; - -static int __init + +static int __init mpc52xx_console_init(void) { register_console(&mpc52xx_console); @@ -771,7 +769,7 @@ mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state) { struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); - if (sport) + if (port) uart_suspend_port(&mpc52xx_uart_driver, port); return 0; |
