diff options
Diffstat (limited to 'drivers/serial/mpc52xx_uart.c')
| -rw-r--r-- | drivers/serial/mpc52xx_uart.c | 852 |
1 files changed, 0 insertions, 852 deletions
diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c deleted file mode 100644 index 0dd08a09e7e..00000000000 --- a/drivers/serial/mpc52xx_uart.c +++ /dev/null @@ -1,852 +0,0 @@ -/* - * 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 device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct resource *res = pdev->resource; - - struct uart_port *port = NULL; - int i, idx, ret; - - /* Check validity & presence */ - idx = pdev->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<pdev->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) - dev_set_drvdata(dev, (void*)port); - - return ret; -} - -static int -mpc52xx_uart_remove(struct device *dev) -{ - struct uart_port *port = (struct uart_port *) dev_get_drvdata(dev); - - dev_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 device *dev, pm_message_t state) -{ - struct uart_port *port = (struct uart_port *) dev_get_drvdata(dev); - - if (sport) - uart_suspend_port(&mpc52xx_uart_driver, port); - - return 0; -} - -static int -mpc52xx_uart_resume(struct device *dev) -{ - struct uart_port *port = (struct uart_port *) dev_get_drvdata(dev); - - if (port) - uart_resume_port(&mpc52xx_uart_driver, port); - - return 0; -} -#endif - -static struct device_driver mpc52xx_uart_platform_driver = { - .name = "mpc52xx-psc", - .bus = &platform_bus_type, - .probe = mpc52xx_uart_probe, - .remove = mpc52xx_uart_remove, -#ifdef CONFIG_PM - .suspend = mpc52xx_uart_suspend, - .resume = mpc52xx_uart_resume, -#endif -}; - - -/* ======================================================================== */ -/* 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 = driver_register(&mpc52xx_uart_platform_driver); - if (ret) - uart_unregister_driver(&mpc52xx_uart_driver); - } - - return ret; -} - -static void __exit -mpc52xx_uart_exit(void) -{ - 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"); |