diff options
Diffstat (limited to 'drivers/char/vme_scc.c')
| -rw-r--r-- | drivers/char/vme_scc.c | 1136 |
1 files changed, 1136 insertions, 0 deletions
diff --git a/drivers/char/vme_scc.c b/drivers/char/vme_scc.c new file mode 100644 index 000000000..15232f832 --- /dev/null +++ b/drivers/char/vme_scc.c @@ -0,0 +1,1136 @@ +/* + * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports + * implementation. + * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk> + * + * Based on atari_SCC.c which was + * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> + * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + * + */ + +#include <linux/module.h> +#include <linux/config.h> +#include <linux/kdev_t.h> +#include <asm/io.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/mm.h> +#include <linux/serial.h> +#include <linux/fcntl.h> +#include <linux/major.h> +#include <linux/delay.h> +#include <linux/tqueue.h> +#include <linux/version.h> +#include <linux/malloc.h> +#include <linux/miscdevice.h> +#include <linux/console.h> +#include <linux/init.h> +#include <asm/setup.h> +#include <asm/bootinfo.h> + +#ifdef CONFIG_MVME147_SCC +#include <asm/mvme147hw.h> +#endif +#ifdef CONFIG_MVME162_SCC +#include <asm/mvme16xhw.h> +#endif +#ifdef CONFIG_BVME6000_SCC +#include <asm/bvme6000hw.h> +#endif + +#include "generic_serial.h" +#include "scc.h" + + +#define CHANNEL_A 0 +#define CHANNEL_B 1 + +#define SCC_MINOR_BASE 64 + +/* Shadows for all SCC write registers */ +static unsigned char scc_shadow[2][16]; + +/* Location to access for SCC register access delay */ +static volatile unsigned char *scc_del = NULL; + +/* To keep track of STATUS_REG state for detection of Ext/Status int source */ +static unsigned char scc_last_status_reg[2]; + +/***************************** Prototypes *****************************/ + +/* Function prototypes */ +static void scc_disable_tx_interrupts(void * ptr); +static void scc_enable_tx_interrupts(void * ptr); +static void scc_disable_rx_interrupts(void * ptr); +static void scc_enable_rx_interrupts(void * ptr); +static int scc_get_CD(void * ptr); +static void scc_shutdown_port(void * ptr); +static void scc_set_real_termios(void *ptr); +static void scc_hungup(void *ptr); +static void scc_close(void *ptr); +static int scc_chars_in_buffer(void * ptr); +static int scc_open(struct tty_struct * tty, struct file * filp); +static int scc_ioctl(struct tty_struct * tty, struct file * filp, + unsigned int cmd, unsigned long arg); +static void scc_throttle(struct tty_struct *tty); +static void scc_unthrottle(struct tty_struct *tty); +static void scc_tx_int(int irq, void *data, struct pt_regs *fp); +static void scc_rx_int(int irq, void *data, struct pt_regs *fp); +static void scc_stat_int(int irq, void *data, struct pt_regs *fp); +static void scc_spcond_int(int irq, void *data, struct pt_regs *fp); +static void scc_setsignals(struct scc_port *port, int dtr, int rts); +static void scc_break_ctl(struct tty_struct *tty, int break_state); + +static struct tty_driver scc_driver, scc_callout_driver; + +static struct tty_struct *scc_table[2] = { NULL, }; +static struct termios * scc_termios[2]; +static struct termios * scc_termios_locked[2]; +struct scc_port scc_ports[2]; + +int scc_refcount; +int scc_initialized = 0; + +/*--------------------------------------------------------------------------- + * Interface from generic_serial.c back here + *--------------------------------------------------------------------------*/ + +static struct real_driver scc_real_driver = { + scc_disable_tx_interrupts, + scc_enable_tx_interrupts, + scc_disable_rx_interrupts, + scc_enable_rx_interrupts, + scc_get_CD, + scc_shutdown_port, + scc_set_real_termios, + scc_chars_in_buffer, + scc_close, + scc_hungup, + NULL +}; + + +/*---------------------------------------------------------------------------- + * vme_scc_init() and support functions + *---------------------------------------------------------------------------*/ + +static int scc_init_drivers(void) +{ + int error; + + memset(&scc_driver, 0, sizeof(scc_driver)); + scc_driver.magic = TTY_DRIVER_MAGIC; + scc_driver.driver_name = "scc"; + scc_driver.name = "ttyS"; + scc_driver.major = TTY_MAJOR; + scc_driver.minor_start = SCC_MINOR_BASE; + scc_driver.num = 2; + scc_driver.type = TTY_DRIVER_TYPE_SERIAL; + scc_driver.subtype = SERIAL_TYPE_NORMAL; + scc_driver.init_termios = tty_std_termios; + scc_driver.init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + scc_driver.flags = TTY_DRIVER_REAL_RAW; + scc_driver.refcount = &scc_refcount; + scc_driver.table = scc_table; + scc_driver.termios = scc_termios; + scc_driver.termios_locked = scc_termios_locked; + + scc_driver.open = scc_open; + scc_driver.close = gs_close; + scc_driver.write = gs_write; + scc_driver.put_char = gs_put_char; + scc_driver.flush_chars = gs_flush_chars; + scc_driver.write_room = gs_write_room; + scc_driver.chars_in_buffer = gs_chars_in_buffer; + scc_driver.flush_buffer = gs_flush_buffer; + scc_driver.ioctl = scc_ioctl; + scc_driver.throttle = scc_throttle; + scc_driver.unthrottle = scc_unthrottle; + scc_driver.set_termios = gs_set_termios; + scc_driver.stop = gs_stop; + scc_driver.start = gs_start; + scc_driver.hangup = gs_hangup; + scc_driver.break_ctl = scc_break_ctl; + + scc_callout_driver = scc_driver; + scc_callout_driver.name = "cua"; + scc_callout_driver.major = TTYAUX_MAJOR; + scc_callout_driver.subtype = SERIAL_TYPE_CALLOUT; + + if ((error = tty_register_driver(&scc_driver))) { + printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n", + error); + return 1; + } + if ((error = tty_register_driver(&scc_callout_driver))) { + tty_unregister_driver(&scc_driver); + printk(KERN_ERR "scc: Couldn't register scc callout driver, error = %d\n", + error); + return 1; + } + + return 0; +} + + +/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1). + */ + +static void scc_init_portstructs(void) +{ + struct scc_port *port; + int i; + + for (i = 0; i < 2; i++) { + port = scc_ports + i; + port->gs.callout_termios = tty_std_termios; + port->gs.normal_termios = tty_std_termios; + port->gs.magic = SCC_MAGIC; + port->gs.close_delay = HZ/2; + port->gs.closing_wait = 30 * HZ; + port->gs.rd = &scc_real_driver; +#ifdef NEW_WRITE_LOCKING + port->gs.port_write_sem = MUTEX; +#endif + init_waitqueue_head(&port->gs.open_wait); + init_waitqueue_head(&port->gs.close_wait); + } +} + + +#ifdef CONFIG_MVME147_SCC +static int mvme147_scc_init(void) +{ + struct scc_port *port; + + printk("SCC: MVME147 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR; + port->datap = port->ctrlp + 1; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, + "SCC-A TX", port); + request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-A status", port); + request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, + "SCC-A RX", port); + request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR; + port->datap = port->ctrlp + 1; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, + "SCC-B TX", port); + request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-B status", port); + request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, + "SCC-B RX", port); + request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-B special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Ensure interrupts are enabled in the PCC chip */ + m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB; + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +#ifdef CONFIG_MVME162_SCC +static int mvme162_scc_init(void) +{ + struct scc_port *port; + + if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA)) + return (-ENODEV); + + printk("SCC: MVME162 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR; + port->datap = port->ctrlp + 2; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, + "SCC-A TX", port); + request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-A status", port); + request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, + "SCC-A RX", port); + request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR; + port->datap = port->ctrlp + 2; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, + "SCC-B TX", port); + request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-B status", port); + request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, + "SCC-B RX", port); + request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-B special cond", port); + + { + SCC_ACCESS_INIT(port); /* Either channel will do */ + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Ensure interrupts are enabled in the MC2 chip */ + *(volatile char *)0xfff4201d = 0x14; + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +#ifdef CONFIG_BVME6000_SCC +static int bvme6000_scc_init(void) +{ + struct scc_port *port; + + printk("SCC: BVME6000 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR; + port->datap = port->ctrlp + 4; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, + "SCC-A TX", port); + request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-A status", port); + request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, + "SCC-A RX", port); + request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR; + port->datap = port->ctrlp + 4; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, + "SCC-B TX", port); + request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, + "SCC-B status", port); + request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, + "SCC-B RX", port); + request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, + "SCC-B special cond", port); + + { + SCC_ACCESS_INIT(port); /* Either channel will do */ + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +int vme_scc_init(void) +{ + int res = -ENODEV; + static int called = 0; + + if (called) + return res; + called = 1; +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + res = mvme147_scc_init(); +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + res = mvme162_scc_init(); +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + res = bvme6000_scc_init(); +#endif + return res; +} + + +/*--------------------------------------------------------------------------- + * Interrupt handlers + *--------------------------------------------------------------------------*/ + +static void scc_rx_int(int irq, void *data, struct pt_regs *fp) +{ + unsigned char ch; + struct scc_port *port = data; + struct tty_struct *tty = port->gs.tty; + SCC_ACCESS_INIT(port); + + ch = SCCread_NB(RX_DATA_REG); + if (!tty) { + printk ("scc_rx_int with NULL tty!\n"); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return; + } + if (tty->flip.count < TTY_FLIPBUF_SIZE) { + *tty->flip.char_buf_ptr = ch; + *tty->flip.flag_buf_ptr = 0; + tty->flip.flag_buf_ptr++; + tty->flip.char_buf_ptr++; + tty->flip.count++; + } + + /* Check if another character is already ready; in that case, the + * spcond_int() function must be used, because this character may have an + * error condition that isn't signalled by the interrupt vector used! + */ + if (SCCread(INT_PENDING_REG) & + (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) { + scc_spcond_int (irq, data, fp); + return; + } + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + + tty_flip_buffer_push(tty); +} + + +static void scc_spcond_int(int irq, void *data, struct pt_regs *fp) +{ + struct scc_port *port = data; + struct tty_struct *tty = port->gs.tty; + unsigned char stat, ch, err; + int int_pending_mask = port->channel == CHANNEL_A ? + IPR_A_RX : IPR_B_RX; + SCC_ACCESS_INIT(port); + + if (!tty) { + printk ("scc_spcond_int with NULL tty!\n"); + SCCwrite(COMMAND_REG, CR_ERROR_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return; + } + do { + stat = SCCread(SPCOND_STATUS_REG); + ch = SCCread_NB(RX_DATA_REG); + + if (stat & SCSR_RX_OVERRUN) + err = TTY_OVERRUN; + else if (stat & SCSR_PARITY_ERR) + err = TTY_PARITY; + else if (stat & SCSR_CRC_FRAME_ERR) + err = TTY_FRAME; + else + err = 0; + + if (tty->flip.count < TTY_FLIPBUF_SIZE) { + *tty->flip.char_buf_ptr = ch; + *tty->flip.flag_buf_ptr = err; + tty->flip.flag_buf_ptr++; + tty->flip.char_buf_ptr++; + tty->flip.count++; + } + + /* ++TeSche: *All* errors have to be cleared manually, + * else the condition persists for the next chars + */ + if (err) + SCCwrite(COMMAND_REG, CR_ERROR_RESET); + + } while(SCCread(INT_PENDING_REG) & int_pending_mask); + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + + tty_flip_buffer_push(tty); +} + + +static void scc_tx_int(int irq, void *data, struct pt_regs *fp) +{ + struct scc_port *port = data; + SCC_ACCESS_INIT(port); + + if (!port->gs.tty) { + printk ("scc_tx_int with NULL tty!\n"); + SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return; + } + while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) { + if (port->x_char) { + SCCwrite(TX_DATA_REG, port->x_char); + port->x_char = 0; + } + else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped || + port->gs.tty->hw_stopped) + break; + else { + SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]); + port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1); + if (--port->gs.xmit_cnt <= 0) + break; + } + } + if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped || + port->gs.tty->hw_stopped) { + /* disable tx interrupts */ + SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */ + port->gs.flags &= ~GS_TX_INTEN; + } + if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars) { + if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && + port->gs.tty->ldisc.write_wakeup) + (port->gs.tty->ldisc.write_wakeup)(port->gs.tty); + wake_up_interruptible(&port->gs.tty->write_wait); + } + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); +} + + +static void scc_stat_int(int irq, void *data, struct pt_regs *fp) +{ + struct scc_port *port = data; + unsigned channel = port->channel; + unsigned char last_sr, sr, changed; + SCC_ACCESS_INIT(port); + + last_sr = scc_last_status_reg[channel]; + sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG); + changed = last_sr ^ sr; + + if (changed & SR_DCD) { + port->c_dcd = !!(sr & SR_DCD); + if (!(port->gs.flags & ASYNC_CHECK_CD)) + ; /* Don't report DCD changes */ + else if (port->c_dcd) { + if (~(port->gs.flags & ASYNC_NORMAL_ACTIVE) || + ~(port->gs.flags & ASYNC_CALLOUT_ACTIVE)) { + /* Are we blocking in open?*/ + wake_up_interruptible(&port->gs.open_wait); + } + } + else { + if (!((port->gs.flags & ASYNC_CALLOUT_ACTIVE) && + (port->gs.flags & ASYNC_CALLOUT_NOHUP))) { + if (port->gs.tty) + tty_hangup (port->gs.tty); + } + } + } + SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); +} + + +/*--------------------------------------------------------------------------- + * generic_serial.c callback funtions + *--------------------------------------------------------------------------*/ + +static void scc_disable_tx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + save_flags(flags); + cli(); + SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + port->gs.flags &= ~GS_TX_INTEN; + restore_flags(flags); +} + + +static void scc_enable_tx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + save_flags(flags); + cli(); + SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB); + /* restart the transmitter */ + scc_tx_int (0, port, 0); + restore_flags(flags); +} + + +static void scc_disable_rx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + save_flags(flags); + cli(); + SCCmod(INT_AND_DMA_REG, + ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0); + restore_flags(flags); +} + + +static void scc_enable_rx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + save_flags(flags); + cli(); + SCCmod(INT_AND_DMA_REG, 0xff, + IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL); + restore_flags(flags); +} + + +static int scc_get_CD(void *ptr) +{ + struct scc_port *port = ptr; + unsigned channel = port->channel; + + return !!(scc_last_status_reg[channel] & SR_DCD); +} + + +static void scc_shutdown_port(void *ptr) +{ + struct scc_port *port = ptr; + + port->gs.flags &= ~ GS_ACTIVE; + if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) { + scc_setsignals (port, 0, 0); + } +} + + +static void scc_set_real_termios (void *ptr) +{ + /* the SCC has char sizes 5,7,6,8 in that order! */ + static int chsize_map[4] = { 0, 2, 1, 3 }; + unsigned cflag, baud, chsize, channel, brgval = 0; + unsigned long flags; + struct scc_port *port = ptr; + SCC_ACCESS_INIT(port); + + if (!port->gs.tty || !port->gs.tty->termios) return; + + channel = port->channel; + + if (channel == CHANNEL_A) + return; /* Settings controlled by boot PROM */ + + cflag = port->gs.tty->termios->c_cflag; + baud = port->gs.baud; + chsize = (cflag & CSIZE) >> 4; + + if (baud == 0) { + /* speed == 0 -> drop DTR */ + save_flags(flags); + cli(); + SCCmod(TX_CTRL_REG, ~TCR_DTR, 0); + restore_flags(flags); + return; + } + else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) || + (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) || + (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) { + printk("SCC: Bad speed requested, %d\n", baud); + return; + } + + if (cflag & CLOCAL) + port->gs.flags &= ~ASYNC_CHECK_CD; + else + port->gs.flags |= ASYNC_CHECK_CD; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; + else +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; + else +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2; +#endif + /* Now we have all parameters and can go to set them: */ + save_flags(flags); + cli(); + + /* receiver's character size and auto-enables */ + SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE), + (chsize_map[chsize] << 6) | + ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0)); + /* parity and stop bits (both, Tx and Rx), clock mode never changes */ + SCCmod (AUX1_CTRL_REG, + ~(A1CR_PARITY_MASK | A1CR_MODE_MASK), + ((cflag & PARENB + ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN) + : A1CR_PARITY_NONE) + | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1))); + /* sender's character size, set DTR for valid baud rate */ + SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR); + /* clock sources never change */ + /* disable BRG before changing the value */ + SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0); + /* BRG value */ + SCCwrite(TIMER_LOW_REG, brgval & 0xff); + SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff); + /* BRG enable, and clock source never changes */ + SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB); + + restore_flags(flags); +} + + +static int scc_chars_in_buffer (void *ptr) +{ + struct scc_port *port = ptr; + SCC_ACCESS_INIT(port); + + return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1; +} + + +static void scc_hungup(void *ptr) +{ + scc_disable_tx_interrupts(ptr); + scc_disable_rx_interrupts(ptr); + MOD_DEC_USE_COUNT; +} + + +static void scc_close(void *ptr) +{ + scc_disable_tx_interrupts(ptr); + scc_disable_rx_interrupts(ptr); +} + + +/*--------------------------------------------------------------------------- + * Internal support functions + *--------------------------------------------------------------------------*/ + +static void scc_setsignals(struct scc_port *port, int dtr, int rts) +{ + unsigned long flags; + unsigned char t; + SCC_ACCESS_INIT(port); + + save_flags(flags); + t = SCCread(TX_CTRL_REG); + if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR); + if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS); + SCCwrite(TX_CTRL_REG, t); + restore_flags(flags); +} + + +static void scc_send_xchar(struct tty_struct *tty, char ch) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + + port->x_char = ch; + if (ch) + scc_enable_tx_interrupts(port); +} + + +/*--------------------------------------------------------------------------- + * Driver entrypoints referenced from above + *--------------------------------------------------------------------------*/ + +static int scc_open (struct tty_struct * tty, struct file * filp) +{ + int line = MINOR(tty->device) - SCC_MINOR_BASE; + int retval; + struct scc_port *port = &scc_ports[line]; + int i, channel = port->channel; + unsigned long flags; + SCC_ACCESS_INIT(port); +#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC) + static const struct { + unsigned reg, val; + } mvme_init_tab[] = { + /* Values for MVME162 and MVME147 */ + /* no parity, 1 stop bit, async, 1:16 */ + { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, + /* parity error is special cond, ints disabled, no DMA */ + { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, + /* Rx 8 bits/char, no auto enable, Rx off */ + { RX_CTRL_REG, RCR_CHSIZE_8 }, + /* DTR off, Tx 8 bits/char, RTS off, Tx off */ + { TX_CTRL_REG, TCR_CHSIZE_8 }, + /* special features off */ + { AUX2_CTRL_REG, 0 }, + { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG }, + { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK }, + /* Start Rx */ + { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, + /* Start Tx */ + { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, + /* Ext/Stat ints: DCD only */ + { INT_CTRL_REG, ICR_ENAB_DCD_INT }, + /* Reset Ext/Stat ints */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + /* ...again */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + }; +#endif +#if defined(CONFIG_BVME6000_SCC) + static const struct { + unsigned reg, val; + } bvme_init_tab[] = { + /* Values for BVME6000 */ + /* no parity, 1 stop bit, async, 1:16 */ + { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, + /* parity error is special cond, ints disabled, no DMA */ + { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, + /* Rx 8 bits/char, no auto enable, Rx off */ + { RX_CTRL_REG, RCR_CHSIZE_8 }, + /* DTR off, Tx 8 bits/char, RTS off, Tx off */ + { TX_CTRL_REG, TCR_CHSIZE_8 }, + /* special features off */ + { AUX2_CTRL_REG, 0 }, + { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG }, + { DPLL_CTRL_REG, DCR_BRG_ENAB }, + /* Start Rx */ + { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, + /* Start Tx */ + { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, + /* Ext/Stat ints: DCD only */ + { INT_CTRL_REG, ICR_ENAB_DCD_INT }, + /* Reset Ext/Stat ints */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + /* ...again */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + }; +#endif + if (!(port->gs.flags & ASYNC_INITIALIZED)) { + save_flags(flags); + cli(); +#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC) + if (MACH_IS_MVME147 || MACH_IS_MVME16x) { + for (i=0; i<sizeof(mvme_init_tab)/sizeof(*mvme_init_tab); ++i) + SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val); + } +#endif +#if defined(CONFIG_BVME6000_SCC) + if (MACH_IS_BVME6000) { + for (i=0; i<sizeof(bvme_init_tab)/sizeof(*bvme_init_tab); ++i) + SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val); + } +#endif + + /* remember status register for detection of DCD and CTS changes */ + scc_last_status_reg[channel] = SCCread(STATUS_REG); + + port->c_dcd = 0; /* Prevent initial 1->0 interrupt */ + scc_setsignals (port, 1,1); + restore_flags(flags); + } + + tty->driver_data = port; + port->gs.tty = tty; + port->gs.count++; + retval = gs_init_port(&port->gs); + if (retval) { + port->gs.count--; + return retval; + } + port->gs.flags |= GS_ACTIVE; + if (port->gs.count == 1) { + MOD_INC_USE_COUNT; + } + retval = block_til_ready(port, filp); + + if (retval) { + MOD_DEC_USE_COUNT; + port->gs.count--; + return retval; + } + + if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)) { + if (tty->driver.subtype == SERIAL_TYPE_NORMAL) + *tty->termios = port->gs.normal_termios; + else + *tty->termios = port->gs.callout_termios; + scc_set_real_termios (port); + } + + port->gs.session = current->session; + port->gs.pgrp = current->pgrp; + port->c_dcd = scc_get_CD (port); + + scc_enable_rx_interrupts(port); + + return 0; +} + + +static void scc_throttle (struct tty_struct * tty) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + if (tty->termios->c_cflag & CRTSCTS) { + save_flags(flags); + cli(); + SCCmod(TX_CTRL_REG, ~TCR_RTS, 0); + restore_flags(flags); + } + if (I_IXOFF(tty)) + scc_send_xchar(tty, STOP_CHAR(tty)); +} + + +static void scc_unthrottle (struct tty_struct * tty) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + if (tty->termios->c_cflag & CRTSCTS) { + save_flags(flags); + cli(); + SCCmod(TX_CTRL_REG, 0xff, TCR_RTS); + restore_flags(flags); + } + if (I_IXOFF(tty)) + scc_send_xchar(tty, START_CHAR(tty)); +} + + +static int scc_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return -ENOIOCTLCMD; +} + + +static void scc_break_ctl(struct tty_struct *tty, int break_state) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + save_flags(flags); + cli(); + SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, + break_state ? TCR_SEND_BREAK : 0); + restore_flags(flags); +} + + +/*--------------------------------------------------------------------------- + * Serial console stuff... + *--------------------------------------------------------------------------*/ + +#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0) + +static void scc_ch_write (char ch) +{ + volatile char *p = NULL; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + p = (volatile char *)M147_SCC_A_ADDR; +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + p = (volatile char *)MVME_SCC_A_ADDR; +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + p = (volatile char *)BVME_SCC_A_ADDR; +#endif + + do { + scc_delay(); + } + while (!(*p & 4)); + scc_delay(); + *p = 8; + scc_delay(); + *p = ch; +} + + +static void scc_console_write (struct console *co, const char *str, unsigned count) +{ + unsigned long flags; + + save_flags(flags); + cli(); + + while (count--) + { + if (*str == '\n') + scc_ch_write ('\r'); + scc_ch_write (*str++); + } + restore_flags(flags); +} + + +static int scc_console_wait_key(struct console *co) +{ + unsigned long flags; + volatile char *p = NULL; + int c; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + p = (volatile char *)M147_SCC_A_ADDR; +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + p = (volatile char *)MVME_SCC_A_ADDR; +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + p = (volatile char *)BVME_SCC_A_ADDR; +#endif + + save_flags(flags); + cli(); + + /* wait for rx buf filled */ + while ((*p & 0x01) == 0) + ; + + *p = 8; + scc_delay(); + c = *p; + restore_flags(flags); + return c; +} + + +static kdev_t scc_console_device(struct console *c) +{ + return MKDEV(TTY_MAJOR, SCC_MINOR_BASE + c->index); +} + + +static int __init scc_console_setup(struct console *co, char *options) +{ + return 0; +} + + +static struct console sercons = { + "ttyS", + scc_console_write, + NULL, + scc_console_device, + scc_console_wait_key, + NULL, + scc_console_setup, + CON_PRINTBUFFER, + -1, + 0, + NULL +}; + + +void __init vme_scc_console_init(void) +{ + if (vme_brdtype == VME_TYPE_MVME147 || + vme_brdtype == VME_TYPE_MVME162 || + vme_brdtype == VME_TYPE_MVME172 || + vme_brdtype == VME_TYPE_BVME4000 || + vme_brdtype == VME_TYPE_BVME6000) + register_console(&sercons); +} + |