URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [macintosh/] [macserial.c] - Rev 1765
Compare with Previous | Blame | View Log
/* * macserial.c: Serial port driver for Power Macintoshes. * * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras. * * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au) * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * * Receive DMA code by Takashi Oe <toe@unlserve.unl.edu>. * * $Id: macserial.c,v 1.1.1.1 2004-04-15 02:30:02 phoenix Exp $ */ #include <linux/config.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/init.h> #ifdef CONFIG_SERIAL_CONSOLE #include <linux/console.h> #endif #include <linux/slab.h> #include <asm/sections.h> #include <asm/io.h> #include <asm/pgtable.h> #include <asm/irq.h> #include <asm/prom.h> #include <asm/system.h> #include <asm/segment.h> #include <asm/bitops.h> #include <asm/machdep.h> #include <asm/pmac_feature.h> #include <linux/adb.h> #include <linux/pmu.h> #ifdef CONFIG_KGDB #include <asm/kgdb.h> #endif #include <asm/dbdma.h> #include "macserial.h" #ifdef CONFIG_PMAC_PBOOK static int serial_notify_sleep(struct pmu_sleep_notifier *self, int when); static struct pmu_sleep_notifier serial_sleep_notifier = { serial_notify_sleep, SLEEP_LEVEL_MISC, }; #endif #define SUPPORT_SERIAL_DMA #define MACSERIAL_VERSION "2.0" /* * It would be nice to dynamically allocate everything that * depends on NUM_SERIAL, so we could support any number of * Z8530s, but for now... */ #define NUM_SERIAL 2 /* Max number of ZS chips supported */ #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */ /* On PowerMacs, the hardware takes care of the SCC recovery time, but we need the eieio to make sure that the accesses occur in the order we want. */ #define RECOVERY_DELAY eieio() struct mac_zschannel zs_channels[NUM_CHANNELS]; struct mac_serial zs_soft[NUM_CHANNELS]; int zs_channels_found; struct mac_serial *zs_chain; /* list of all channels */ struct tty_struct zs_ttys[NUM_CHANNELS]; static int is_powerbook; #ifdef CONFIG_SERIAL_CONSOLE static struct console sercons; #endif #ifdef CONFIG_KGDB struct mac_zschannel *zs_kgdbchan; static unsigned char scc_inittab[] = { 9, 0x80, /* reset A side (CHRA) */ 13, 0, /* set baud rate divisor */ 12, 1, 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */ 11, 0x50, /* clocks = br gen (RCBR | TCBR) */ 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */ 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/ 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/ }; #endif #define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */ static DECLARE_TASK_QUEUE(tq_serial); static struct tty_driver serial_driver, callout_driver; static int serial_refcount; /* serial subtype definitions */ #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* * Debugging. */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #undef SERIAL_DEBUG_POWER #undef SERIAL_DEBUG_THROTTLE #undef SERIAL_DEBUG_STOP #undef SERIAL_DEBUG_BAUDS #define RS_STROBE_TIME 10 #define RS_ISR_PASS_LIMIT 256 #define _INLINE_ inline #ifdef SERIAL_DEBUG_OPEN #define OPNDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg) #else #define OPNDBG(fmt, arg...) do { } while (0) #endif #ifdef SERIAL_DEBUG_POWER #define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg) #else #define PWRDBG(fmt, arg...) do { } while (0) #endif #ifdef SERIAL_DEBUG_BAUDS #define BAUDBG(fmt, arg...) printk(fmt , ## arg) #else #define BAUDBG(fmt, arg...) do { } while (0) #endif static void probe_sccs(void); static void change_speed(struct mac_serial *info, struct termios *old); static void rs_wait_until_sent(struct tty_struct *tty, int timeout); static int set_scc_power(struct mac_serial * info, int state); static int setup_scc(struct mac_serial * info); static void dbdma_reset(volatile struct dbdma_regs *dma); static void dbdma_flush(volatile struct dbdma_regs *dma); static void rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs); static void rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs); static void dma_init(struct mac_serial * info); static void rxdma_start(struct mac_serial * info, int current); static void rxdma_to_tty(struct mac_serial * info); static struct tty_struct *serial_table[NUM_CHANNELS]; static struct termios *serial_termios[NUM_CHANNELS]; static struct termios *serial_termios_locked[NUM_CHANNELS]; #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /* * tmp_buf is used as a temporary buffer by serial_write. We need to * lock it in case the copy_from_user blocks while swapping in a page, * and some other program tries to do a serial write at the same time. * Since the lock will only come under contention when the system is * swapping and available memory is low, it makes sense to share one * buffer across all the serial ports, since it significantly saves * memory if large numbers of serial ports are open. */ static unsigned char *tmp_buf; static DECLARE_MUTEX(tmp_buf_sem); static inline int __pmac serial_paranoia_check(struct mac_serial *info, dev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char badmagic[] = KERN_WARNING "Warning: bad magic number for serial struct (%d, %d) in %s\n"; static const char badinfo[] = KERN_WARNING "Warning: null mac_serial for (%d, %d) in %s\n"; if (!info) { printk(badinfo, MAJOR(device), MINOR(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, MAJOR(device), MINOR(device), routine); return 1; } #endif return 0; } /* * Reading and writing Z8530 registers. */ static inline unsigned char __pmac read_zsreg(struct mac_zschannel *channel, unsigned char reg) { unsigned char retval; unsigned long flags; /* * We have to make this atomic. */ spin_lock_irqsave(&channel->lock, flags); if (reg != 0) { *channel->control = reg; RECOVERY_DELAY; } retval = *channel->control; RECOVERY_DELAY; spin_unlock_irqrestore(&channel->lock, flags); return retval; } static inline void __pmac write_zsreg(struct mac_zschannel *channel, unsigned char reg, unsigned char value) { unsigned long flags; spin_lock_irqsave(&channel->lock, flags); if (reg != 0) { *channel->control = reg; RECOVERY_DELAY; } *channel->control = value; RECOVERY_DELAY; spin_unlock_irqrestore(&channel->lock, flags); return; } static inline unsigned char __pmac read_zsdata(struct mac_zschannel *channel) { unsigned char retval; retval = *channel->data; RECOVERY_DELAY; return retval; } static inline void write_zsdata(struct mac_zschannel *channel, unsigned char value) { *channel->data = value; RECOVERY_DELAY; return; } static inline void load_zsregs(struct mac_zschannel *channel, unsigned char *regs) { ZS_CLEARERR(channel); ZS_CLEARFIFO(channel); /* Load 'em up */ write_zsreg(channel, R4, regs[R4]); write_zsreg(channel, R10, regs[R10]); write_zsreg(channel, R3, regs[R3] & ~RxENABLE); write_zsreg(channel, R5, regs[R5] & ~TxENAB); write_zsreg(channel, R1, regs[R1]); write_zsreg(channel, R9, regs[R9]); write_zsreg(channel, R11, regs[R11]); write_zsreg(channel, R12, regs[R12]); write_zsreg(channel, R13, regs[R13]); write_zsreg(channel, R14, regs[R14]); write_zsreg(channel, R15, regs[R15]); write_zsreg(channel, R3, regs[R3]); write_zsreg(channel, R5, regs[R5]); return; } /* Sets or clears DTR/RTS on the requested line */ static inline void zs_rtsdtr(struct mac_serial *ss, int set) { if (set) ss->curregs[5] |= (RTS | DTR); else ss->curregs[5] &= ~(RTS | DTR); write_zsreg(ss->zs_channel, 5, ss->curregs[5]); return; } /* Utility routines for the Zilog */ static inline int get_zsbaud(struct mac_serial *ss) { struct mac_zschannel *channel = ss->zs_channel; int brg; if ((ss->curregs[R11] & TCBR) == 0) { /* higher rates don't use the baud rate generator */ return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16; } /* The baud rate is split up between two 8-bit registers in * what is termed 'BRG time constant' format in my docs for * the chip, it is a function of the clk rate the chip is * receiving which happens to be constant. */ brg = (read_zsreg(channel, 13) << 8); brg |= read_zsreg(channel, 12); return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor))); } /* On receive, this clears errors and the receiver interrupts */ static inline void rs_recv_clear(struct mac_zschannel *zsc) { write_zsreg(zsc, 0, ERR_RES); write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */ } /* * Reset a Descriptor-Based DMA channel. */ static void dbdma_reset(volatile struct dbdma_regs *dma) { int i; out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16); /* * Yes this looks peculiar, but apparently it needs to be this * way on some machines. (We need to make sure the DBDMA * engine has actually got the write above and responded * to it. - paulus) */ for (i = 200; i > 0; --i) if (ld_le32(&dma->status) & RUN) udelay(1); } /* * Tells a DBDMA channel to stop and write any buffered data * it might have to memory. */ static _INLINE_ void dbdma_flush(volatile struct dbdma_regs *dma) { int i = 0; out_le32(&dma->control, (FLUSH << 16) | FLUSH); while (((in_le32(&dma->status) & FLUSH) != 0) && (i++ < 100)) udelay(1); } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * rs_interrupt(). They were separated out for readability's sake. * * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 * ----------------------------------------------------------------------- */ /* * This routine is used by the interrupt handler to schedule * processing in the software interrupt portion of the driver. */ static _INLINE_ void rs_sched_event(struct mac_serial *info, int event) { info->event |= 1 << event; queue_task(&info->tqueue, &tq_serial); mark_bh(MACSERIAL_BH); } /* Work out the flag value for a z8530 status value. */ static _INLINE_ int stat_to_flag(int stat) { int flag; if (stat & Rx_OVR) { flag = TTY_OVERRUN; } else if (stat & FRM_ERR) { flag = TTY_FRAME; } else if (stat & PAR_ERR) { flag = TTY_PARITY; } else flag = 0; return flag; } static _INLINE_ void receive_chars(struct mac_serial *info, struct pt_regs *regs) { struct tty_struct *tty = info->tty; unsigned char ch, stat, flag; while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) { stat = read_zsreg(info->zs_channel, R1); ch = read_zsdata(info->zs_channel); #ifdef CONFIG_KGDB if (info->kgdb_channel) { if (ch == 0x03 || ch == '$') breakpoint(); if (stat & (Rx_OVR|FRM_ERR|PAR_ERR)) write_zsreg(info->zs_channel, 0, ERR_RES); return; } #endif if (!tty) continue; if (tty->flip.count >= TTY_FLIPBUF_SIZE) tty_flip_buffer_push(tty); if (tty->flip.count >= TTY_FLIPBUF_SIZE) { static int flip_buf_ovf; if (++flip_buf_ovf <= 1) printk(KERN_WARNING "FB. overflow: %d\n", flip_buf_ovf); break; } tty->flip.count++; { static int flip_max_cnt; if (flip_max_cnt < tty->flip.count) flip_max_cnt = tty->flip.count; } flag = stat_to_flag(stat); if (flag) /* reset the error indication */ write_zsreg(info->zs_channel, 0, ERR_RES); *tty->flip.flag_buf_ptr++ = flag; *tty->flip.char_buf_ptr++ = ch; } if (tty) tty_flip_buffer_push(tty); } static void transmit_chars(struct mac_serial *info) { unsigned long flags; save_flags(flags); cli(); if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) goto out; info->tx_active = 0; if (info->x_char && !info->power_wait) { /* Send next char */ write_zsdata(info->zs_channel, info->x_char); info->x_char = 0; info->tx_active = 1; goto out; } if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped || info->power_wait) { write_zsreg(info->zs_channel, 0, RES_Tx_P); goto out; } /* Send char */ write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; info->tx_active = 1; if (info->xmit_cnt < WAKEUP_CHARS) rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); out: restore_flags(flags); } static void powerup_done(unsigned long data) { struct mac_serial *info = (struct mac_serial *) data; info->power_wait = 0; transmit_chars(info); } static _INLINE_ void status_handle(struct mac_serial *info) { unsigned char status; /* Get status from Read Register 0 */ status = read_zsreg(info->zs_channel, 0); /* Check for DCD transitions */ if (((status ^ info->read_reg_zero) & DCD) != 0 && info->tty && !C_CLOCAL(info->tty)) { if (status & DCD) { wake_up_interruptible(&info->open_wait); } else if (!(info->flags & ZILOG_CALLOUT_ACTIVE)) { if (info->tty) tty_hangup(info->tty); } } /* Check for CTS transitions */ if (info->tty && C_CRTSCTS(info->tty)) { /* * For some reason, on the Power Macintosh, * it seems that the CTS bit is 1 when CTS is * *negated* and 0 when it is asserted. * The DCD bit doesn't seem to be inverted * like this. */ if ((status & CTS) == 0) { if (info->tx_stopped) { #ifdef SERIAL_DEBUG_FLOW printk(KERN_DEBUG "CTS up\n"); #endif info->tx_stopped = 0; if (!info->tx_active) transmit_chars(info); } } else { #ifdef SERIAL_DEBUG_FLOW printk(KERN_DEBUG "CTS down\n"); #endif info->tx_stopped = 1; } } /* Clear status condition... */ write_zsreg(info->zs_channel, 0, RES_EXT_INT); info->read_reg_zero = status; } static _INLINE_ void receive_special_dma(struct mac_serial *info) { unsigned char stat, flag; volatile struct dbdma_regs *rd = &info->rx->dma; int where = RX_BUF_SIZE; spin_lock(&info->rx_dma_lock); if ((ld_le32(&rd->status) & ACTIVE) != 0) dbdma_flush(rd); if (in_le32(&rd->cmdptr) == virt_to_bus(info->rx_cmds[info->rx_cbuf] + 1)) where -= in_le16(&info->rx->res_count); where--; stat = read_zsreg(info->zs_channel, R1); flag = stat_to_flag(stat); if (flag) { info->rx_flag_buf[info->rx_cbuf][where] = flag; /* reset the error indication */ write_zsreg(info->zs_channel, 0, ERR_RES); } spin_unlock(&info->rx_dma_lock); } /* * This is the serial driver's generic interrupt routine */ static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) { struct mac_serial *info = (struct mac_serial *) dev_id; unsigned char zs_intreg; int shift; if (!(info->flags & ZILOG_INITIALIZED)) { printk(KERN_WARNING "rs_interrupt: irq %d, port not " "initialized\n", irq); disable_irq(irq); return; } /* NOTE: The read register 3, which holds the irq status, * does so for both channels on each chip. Although * the status value itself must be read from the A * channel and is only valid when read from channel A. * Yes... broken hardware... */ #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT) if (info->zs_chan_a == info->zs_channel) shift = 3; /* Channel A */ else shift = 0; /* Channel B */ for (;;) { zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift; #ifdef SERIAL_DEBUG_INTR printk(KERN_DEBUG "rs_interrupt: irq %d, zs_intreg 0x%x\n", irq, (int)zs_intreg); #endif if ((zs_intreg & CHAN_IRQMASK) == 0) break; if (zs_intreg & CHBRxIP) { /* If we are doing DMA, we only ask for interrupts on characters with errors or special conditions. */ if (info->dma_initted) receive_special_dma(info); else receive_chars(info, regs); } if (zs_intreg & CHBTxIP) transmit_chars(info); if (zs_intreg & CHBEXT) status_handle(info); } } /* Transmit DMA interrupt - not used at present */ static void rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs) { } /* * Receive DMA interrupt. */ static void rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs) { struct mac_serial *info = (struct mac_serial *) dev_id; volatile struct dbdma_cmd *cd; if (!info->dma_initted) return; spin_lock(&info->rx_dma_lock); /* First, confirm that this interrupt is, indeed, coming */ /* from Rx DMA */ cd = info->rx_cmds[info->rx_cbuf] + 2; if ((in_le16(&cd->xfer_status) & (RUN | ACTIVE)) != (RUN | ACTIVE)) { spin_unlock(&info->rx_dma_lock); return; } if (info->rx_fbuf != RX_NO_FBUF) { info->rx_cbuf = info->rx_fbuf; if (++info->rx_fbuf == info->rx_nbuf) info->rx_fbuf = 0; if (info->rx_fbuf == info->rx_ubuf) info->rx_fbuf = RX_NO_FBUF; } spin_unlock(&info->rx_dma_lock); } /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * ------------------------------------------------------------ * rs_stop() and rs_start() * * This routines are called before setting or resetting tty->stopped. * ------------------------------------------------------------ */ static void rs_stop(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; #ifdef SERIAL_DEBUG_STOP printk(KERN_DEBUG "rs_stop %ld....\n", tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_stop")) return; #if 0 save_flags(flags); cli(); if (info->curregs[5] & TxENAB) { info->curregs[5] &= ~TxENAB; info->pendregs[5] &= ~TxENAB; write_zsreg(info->zs_channel, 5, info->curregs[5]); } restore_flags(flags); #endif } static void rs_start(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_STOP printk(KERN_DEBUG "rs_start %ld....\n", tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_start")) return; save_flags(flags); cli(); #if 0 if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) { info->curregs[5] |= TxENAB; info->pendregs[5] = info->curregs[5]; write_zsreg(info->zs_channel, 5, info->curregs[5]); } #else if (info->xmit_cnt && info->xmit_buf && !info->tx_active) { transmit_chars(info); } #endif restore_flags(flags); } /* * This routine is used to handle the "bottom half" processing for the * serial driver, known also the "software interrupt" processing. * This processing is done at the kernel interrupt level, after the * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This * is where time-consuming activities which can not be done in the * interrupt driver proper are done; the interrupt driver schedules * them using rs_sched_event(), and they get done here. */ static void do_serial_bh(void) { run_task_queue(&tq_serial); } static void do_softint(void *private_) { struct mac_serial *info = (struct mac_serial *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); } } static int startup(struct mac_serial * info) { int delay; OPNDBG("startup() (ttyS%d, irq %d)\n", info->line, info->irq); if (info->flags & ZILOG_INITIALIZED) { OPNDBG(" -> already inited\n"); return 0; } if (!info->xmit_buf) { info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL); if (!info->xmit_buf) return -ENOMEM; } OPNDBG("starting up ttyS%d (irq %d)...\n", info->line, info->irq); delay = set_scc_power(info, 1); setup_scc(info); if (delay) { unsigned long flags; /* delay is in ms */ save_flags(flags); cli(); info->power_wait = 1; mod_timer(&info->powerup_timer, jiffies + (delay * HZ + 999) / 1000); restore_flags(flags); } OPNDBG("enabling IRQ on ttyS%d (irq %d)...\n", info->line, info->irq); info->flags |= ZILOG_INITIALIZED; enable_irq(info->irq); if (info->dma_initted) { enable_irq(info->rx_dma_irq); } return 0; } static _INLINE_ void rxdma_start(struct mac_serial * info, int current) { volatile struct dbdma_regs *rd = &info->rx->dma; volatile struct dbdma_cmd *cd = info->rx_cmds[current]; //printk(KERN_DEBUG "SCC: rxdma_start\n"); st_le32(&rd->cmdptr, virt_to_bus(cd)); out_le32(&rd->control, (RUN << 16) | RUN); } static void rxdma_to_tty(struct mac_serial *info) { struct tty_struct *tty = info->tty; volatile struct dbdma_regs *rd = &info->rx->dma; unsigned long flags; int residue, available, space, do_queue; if (!tty) return; do_queue = 0; spin_lock_irqsave(&info->rx_dma_lock, flags); more: space = TTY_FLIPBUF_SIZE - tty->flip.count; if (!space) { do_queue++; goto out; } residue = 0; if (info->rx_ubuf == info->rx_cbuf) { if ((ld_le32(&rd->status) & ACTIVE) != 0) { dbdma_flush(rd); if (in_le32(&rd->cmdptr) == virt_to_bus(info->rx_cmds[info->rx_cbuf]+1)) residue = in_le16(&info->rx->res_count); } } available = RX_BUF_SIZE - residue - info->rx_done_bytes; if (available > space) available = space; if (available) { memcpy(tty->flip.char_buf_ptr, info->rx_char_buf[info->rx_ubuf] + info->rx_done_bytes, available); memcpy(tty->flip.flag_buf_ptr, info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes, available); tty->flip.char_buf_ptr += available; tty->flip.count += available; tty->flip.flag_buf_ptr += available; memset(info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes, 0, available); info->rx_done_bytes += available; do_queue++; } if (info->rx_done_bytes == RX_BUF_SIZE) { volatile struct dbdma_cmd *cd = info->rx_cmds[info->rx_ubuf]; if (info->rx_ubuf == info->rx_cbuf) goto out; /* mark rx_char_buf[rx_ubuf] free */ st_le16(&cd->command, DBDMA_NOP); cd++; st_le32(&cd->cmd_dep, 0); st_le32((unsigned int *)&cd->res_count, 0); cd++; st_le16(&cd->xfer_status, 0); if (info->rx_fbuf == RX_NO_FBUF) { info->rx_fbuf = info->rx_ubuf; if (!(ld_le32(&rd->status) & ACTIVE)) { dbdma_reset(&info->rx->dma); rxdma_start(info, info->rx_ubuf); info->rx_cbuf = info->rx_ubuf; } } info->rx_done_bytes = 0; if (++info->rx_ubuf == info->rx_nbuf) info->rx_ubuf = 0; if (info->rx_fbuf == info->rx_ubuf) info->rx_fbuf = RX_NO_FBUF; goto more; } out: spin_unlock_irqrestore(&info->rx_dma_lock, flags); if (do_queue) queue_task(&tty->flip.tqueue, &tq_timer); } static void poll_rxdma(unsigned long private_) { struct mac_serial *info = (struct mac_serial *) private_; unsigned long flags; rxdma_to_tty(info); spin_lock_irqsave(&info->rx_dma_lock, flags); mod_timer(&info->poll_dma_timer, RX_DMA_TIMER); spin_unlock_irqrestore(&info->rx_dma_lock, flags); } static void dma_init(struct mac_serial * info) { int i, size; volatile struct dbdma_cmd *cd; unsigned char *p; info->rx_nbuf = 8; /* various mem set up */ size = sizeof(struct dbdma_cmd) * (3 * info->rx_nbuf + 2) + (RX_BUF_SIZE * 2 + sizeof(*info->rx_cmds) + sizeof(*info->rx_char_buf) + sizeof(*info->rx_flag_buf)) * info->rx_nbuf; info->dma_priv = kmalloc(size, GFP_KERNEL | GFP_DMA); if (info->dma_priv == NULL) return; memset(info->dma_priv, 0, size); info->rx_cmds = (volatile struct dbdma_cmd **)info->dma_priv; info->rx_char_buf = (unsigned char **) (info->rx_cmds + info->rx_nbuf); info->rx_flag_buf = info->rx_char_buf + info->rx_nbuf; p = (unsigned char *) (info->rx_flag_buf + info->rx_nbuf); for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE) info->rx_char_buf[i] = p; for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE) info->rx_flag_buf[i] = p; /* a bit of DMA programming */ cd = info->rx_cmds[0] = (volatile struct dbdma_cmd *) DBDMA_ALIGN(p); st_le16(&cd->command, DBDMA_NOP); cd++; st_le16(&cd->req_count, RX_BUF_SIZE); st_le16(&cd->command, INPUT_MORE); st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[0])); cd++; st_le16(&cd->req_count, 4); st_le16(&cd->command, STORE_WORD | INTR_ALWAYS); st_le32(&cd->phy_addr, virt_to_bus(cd-2)); st_le32(&cd->cmd_dep, DBDMA_STOP); for (i = 1; i < info->rx_nbuf; i++) { info->rx_cmds[i] = ++cd; st_le16(&cd->command, DBDMA_NOP); cd++; st_le16(&cd->req_count, RX_BUF_SIZE); st_le16(&cd->command, INPUT_MORE); st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[i])); cd++; st_le16(&cd->req_count, 4); st_le16(&cd->command, STORE_WORD | INTR_ALWAYS); st_le32(&cd->phy_addr, virt_to_bus(cd-2)); st_le32(&cd->cmd_dep, DBDMA_STOP); } cd++; st_le16(&cd->command, DBDMA_NOP | BR_ALWAYS); st_le32(&cd->cmd_dep, virt_to_bus(info->rx_cmds[0])); /* setup DMA to our liking */ dbdma_reset(&info->rx->dma); st_le32(&info->rx->dma.intr_sel, 0x10001); st_le32(&info->rx->dma.br_sel, 0x10001); out_le32(&info->rx->dma.wait_sel, 0x10001); /* set various flags */ info->rx_ubuf = 0; info->rx_cbuf = 0; info->rx_fbuf = info->rx_ubuf + 1; if (info->rx_fbuf == info->rx_nbuf) info->rx_fbuf = RX_NO_FBUF; info->rx_done_bytes = 0; /* setup polling */ init_timer(&info->poll_dma_timer); info->poll_dma_timer.function = (void *)&poll_rxdma; info->poll_dma_timer.data = (unsigned long)info; info->dma_initted = 1; } /* * FixZeroBug....Works around a bug in the SCC receving channel. * Taken from Darwin code, 15 Sept. 2000 -DanM * * The following sequence prevents a problem that is seen with O'Hare ASICs * (most versions -- also with some Heathrow and Hydra ASICs) where a zero * at the input to the receiver becomes 'stuck' and locks up the receiver. * This problem can occur as a result of a zero bit at the receiver input * coincident with any of the following events: * * The SCC is initialized (hardware or software). * A framing error is detected. * The clocking option changes from synchronous or X1 asynchronous * clocking to X16, X32, or X64 asynchronous clocking. * The decoding mode is changed among NRZ, NRZI, FM0, or FM1. * * This workaround attempts to recover from the lockup condition by placing * the SCC in synchronous loopback mode with a fast clock before programming * any of the asynchronous modes. */ static void fix_zero_bug_scc(struct mac_serial * info) { write_zsreg(info->zs_channel, 9, (info->zs_channel == info->zs_chan_a? CHRA: CHRB)); udelay(10); write_zsreg(info->zs_channel, 9, ((info->zs_channel == info->zs_chan_a? CHRA: CHRB) | NV)); write_zsreg(info->zs_channel, 4, (X1CLK | EXTSYNC)); /* I think this is wrong....but, I just copying code.... */ write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE)); write_zsreg(info->zs_channel, 5, (8 & ~TxENAB)); write_zsreg(info->zs_channel, 9, NV); /* Didn't we already do this? */ write_zsreg(info->zs_channel, 11, (RCBR | TCBR)); write_zsreg(info->zs_channel, 12, 0); write_zsreg(info->zs_channel, 13, 0); write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR)); write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR | BRENABL)); write_zsreg(info->zs_channel, 3, (8 | RxENABLE)); write_zsreg(info->zs_channel, 0, RES_EXT_INT); write_zsreg(info->zs_channel, 0, RES_EXT_INT); /* to kill some time */ /* The channel should be OK now, but it is probably receiving * loopback garbage. * Switch to asynchronous mode, disable the receiver, * and discard everything in the receive buffer. */ write_zsreg(info->zs_channel, 9, NV); write_zsreg(info->zs_channel, 4, PAR_ENA); write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE)); while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) { (void)read_zsreg(info->zs_channel, 8); write_zsreg(info->zs_channel, 0, RES_EXT_INT); write_zsreg(info->zs_channel, 0, ERR_RES); } } static int setup_scc(struct mac_serial * info) { unsigned long flags; OPNDBG("setting up ttyS%d SCC...\n", info->line); save_flags(flags); cli(); /* Disable interrupts */ /* Nice buggy HW ... */ fix_zero_bug_scc(info); /* * Reset the chip. */ write_zsreg(info->zs_channel, 9, (info->zs_channel == info->zs_chan_a? CHRA: CHRB)); udelay(10); write_zsreg(info->zs_channel, 9, 0); /* * Clear the receive FIFO. */ ZS_CLEARFIFO(info->zs_channel); info->xmit_fifo_size = 1; /* * Reset DMAs */ if (info->has_dma) dma_init(info); /* * Clear the interrupt registers. */ write_zsreg(info->zs_channel, 0, ERR_RES); write_zsreg(info->zs_channel, 0, RES_H_IUS); /* * Turn on RTS and DTR. */ if (!info->is_irda) zs_rtsdtr(info, 1); /* * Finally, enable sequencing and interrupts */ if (!info->dma_initted) { /* interrupt on ext/status changes, all received chars, transmit ready */ info->curregs[1] = (info->curregs[1] & ~0x18) | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB); } else { /* interrupt on ext/status changes, W/Req pin is receive DMA request */ info->curregs[1] = (info->curregs[1] & ~(0x18 | TxINT_ENAB)) | (EXT_INT_ENAB | WT_RDY_RT | WT_FN_RDYFN); write_zsreg(info->zs_channel, 1, info->curregs[1]); /* enable W/Req pin */ info->curregs[1] |= WT_RDY_ENAB; write_zsreg(info->zs_channel, 1, info->curregs[1]); /* enable interrupts on transmit ready and receive errors */ info->curregs[1] |= INT_ERR_Rx | TxINT_ENAB; } info->pendregs[1] = info->curregs[1]; info->curregs[3] |= (RxENABLE | Rx8); info->pendregs[3] = info->curregs[3]; info->curregs[5] |= (TxENAB | Tx8); info->pendregs[5] = info->curregs[5]; info->curregs[9] |= (NV | MIE); info->pendregs[9] = info->curregs[9]; write_zsreg(info->zs_channel, 3, info->curregs[3]); write_zsreg(info->zs_channel, 5, info->curregs[5]); write_zsreg(info->zs_channel, 9, info->curregs[9]); if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * Set the speed of the serial port */ change_speed(info, 0); /* Save the current value of RR0 */ info->read_reg_zero = read_zsreg(info->zs_channel, 0); restore_flags(flags); if (info->dma_initted) { spin_lock_irqsave(&info->rx_dma_lock, flags); rxdma_start(info, 0); info->poll_dma_timer.expires = RX_DMA_TIMER; add_timer(&info->poll_dma_timer); spin_unlock_irqrestore(&info->rx_dma_lock, flags); } return 0; } /* * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void shutdown(struct mac_serial * info) { OPNDBG("Shutting down serial port %d (irq %d)....\n", info->line, info->irq); if (!(info->flags & ZILOG_INITIALIZED)) { OPNDBG("(already shutdown)\n"); return; } if (info->has_dma) { del_timer(&info->poll_dma_timer); dbdma_reset(info->tx_dma); dbdma_reset(&info->rx->dma); disable_irq(info->tx_dma_irq); disable_irq(info->rx_dma_irq); } disable_irq(info->irq); info->pendregs[1] = info->curregs[1] = 0; write_zsreg(info->zs_channel, 1, 0); /* no interrupts */ info->curregs[3] &= ~RxENABLE; info->pendregs[3] = info->curregs[3]; write_zsreg(info->zs_channel, 3, info->curregs[3]); info->curregs[5] &= ~TxENAB; if (!info->tty || C_HUPCL(info->tty)) info->curregs[5] &= ~DTR; info->pendregs[5] = info->curregs[5]; write_zsreg(info->zs_channel, 5, info->curregs[5]); if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); set_scc_power(info, 0); if (info->xmit_buf) { free_page((unsigned long) info->xmit_buf); info->xmit_buf = 0; } if (info->has_dma && info->dma_priv) { kfree(info->dma_priv); info->dma_priv = NULL; info->dma_initted = 0; } memset(info->curregs, 0, sizeof(info->curregs)); memset(info->pendregs, 0, sizeof(info->pendregs)); info->flags &= ~ZILOG_INITIALIZED; } /* * Turn power on or off to the SCC and associated stuff * (port drivers, modem, IR port, etc.) * Returns the number of milliseconds we should wait before * trying to use the port. */ static int set_scc_power(struct mac_serial * info, int state) { int delay = 0; if (state) { PWRDBG("ttyS%d: powering up hardware\n", info->line); pmac_call_feature( PMAC_FTR_SCC_ENABLE, info->dev_node, info->port_type, 1); if (info->is_internal_modem) { pmac_call_feature( PMAC_FTR_MODEM_ENABLE, info->dev_node, 0, 1); delay = 2500; /* wait for 2.5s before using */ } else if (info->is_irda) mdelay(50); /* Do better here once the problems * with blocking have been ironed out */ } else { /* TODO: Make that depend on a timer, don't power down * immediately */ PWRDBG("ttyS%d: shutting down hardware\n", info->line); if (info->is_internal_modem) { PWRDBG("ttyS%d: shutting down modem\n", info->line); pmac_call_feature( PMAC_FTR_MODEM_ENABLE, info->dev_node, 0, 0); } pmac_call_feature( PMAC_FTR_SCC_ENABLE, info->dev_node, info->port_type, 0); } return delay; } static void irda_rts_pulses(struct mac_serial *info, int w) { unsigned long flags; udelay(w); save_flags(flags); cli(); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB); udelay(2); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS); udelay(8); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB); udelay(4); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS); restore_flags(flags); } /* * Set the irda codec on the imac to the specified baud rate. */ static void irda_setup(struct mac_serial *info) { int code, speed, t; unsigned long flags; speed = info->tty->termios->c_cflag & CBAUD; if (speed < B2400 || speed > B115200) return; code = 0x4d + B115200 - speed; /* disable serial interrupts and receive DMA */ write_zsreg(info->zs_channel, 1, info->curregs[1] & ~0x9f); /* wait for transmitter to drain */ t = 10000; while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0 || (read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) { if (--t <= 0) { printk(KERN_ERR "transmitter didn't drain\n"); return; } udelay(10); } udelay(100); /* set to 8 bits, no parity, 19200 baud, RTS on, DTR off */ write_zsreg(info->zs_channel, 4, X16CLK | SB1); write_zsreg(info->zs_channel, 11, TCBR | RCBR); t = BPS_TO_BRG(19200, ZS_CLOCK/16); write_zsreg(info->zs_channel, 12, t); write_zsreg(info->zs_channel, 13, t >> 8); write_zsreg(info->zs_channel, 14, BRENABL); write_zsreg(info->zs_channel, 3, Rx8 | RxENABLE); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS); /* set TxD low for ~104us and pulse RTS */ udelay(1000); save_flags(flags); cli(); write_zsdata(info->zs_channel, 0xfe); irda_rts_pulses(info, 150); restore_flags(flags); irda_rts_pulses(info, 180); irda_rts_pulses(info, 50); udelay(100); /* assert DTR, wait 30ms, talk to the chip */ write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS | DTR); mdelay(30); while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) read_zsdata(info->zs_channel); write_zsdata(info->zs_channel, 1); t = 1000; while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) { if (--t <= 0) { printk(KERN_ERR "irda_setup timed out on 1st byte\n"); goto out; } udelay(10); } t = read_zsdata(info->zs_channel); if (t != 4) printk(KERN_ERR "irda_setup 1st byte = %x\n", t); write_zsdata(info->zs_channel, code); t = 1000; while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) { if (--t <= 0) { printk(KERN_ERR "irda_setup timed out on 2nd byte\n"); goto out; } udelay(10); } t = read_zsdata(info->zs_channel); if (t != code) printk(KERN_ERR "irda_setup 2nd byte = %x (%x)\n", t, code); /* Drop DTR again and do some more RTS pulses */ out: udelay(100); write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS); irda_rts_pulses(info, 80); /* We should be right to go now. We assume that load_zsregs will get called soon to load up the correct baud rate etc. */ info->curregs[5] = (info->curregs[5] | RTS) & ~DTR; info->pendregs[5] = info->curregs[5]; } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static void change_speed(struct mac_serial *info, struct termios *old_termios) { unsigned cflag; int bits; int brg, baud; unsigned long flags; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; baud = tty_get_baud_rate(info->tty); if (baud == 0) { if (old_termios) { info->tty->termios->c_cflag &= ~CBAUD; info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); cflag = info->tty->termios->c_cflag; baud = tty_get_baud_rate(info->tty); } else baud = info->zs_baud; } if (baud > 230400) baud = 230400; else if (baud == 0) baud = 38400; save_flags(flags); cli(); info->zs_baud = baud; info->clk_divisor = 16; BAUDBG(KERN_DEBUG "set speed to %d bds, ", baud); switch (baud) { case ZS_CLOCK/16: /* 230400 */ info->curregs[4] = X16CLK; info->curregs[11] = 0; break; case ZS_CLOCK/32: /* 115200 */ info->curregs[4] = X32CLK; info->curregs[11] = 0; break; default: info->curregs[4] = X16CLK; info->curregs[11] = TCBR | RCBR; brg = BPS_TO_BRG(baud, ZS_CLOCK/info->clk_divisor); info->curregs[12] = (brg & 255); info->curregs[13] = ((brg >> 8) & 255); info->curregs[14] = BRENABL; } /* byte size and parity */ info->curregs[3] &= ~RxNBITS_MASK; info->curregs[5] &= ~TxNBITS_MASK; switch (cflag & CSIZE) { case CS5: info->curregs[3] |= Rx5; info->curregs[5] |= Tx5; BAUDBG("5 bits, "); bits = 7; break; case CS6: info->curregs[3] |= Rx6; info->curregs[5] |= Tx6; BAUDBG("6 bits, "); bits = 8; break; case CS7: info->curregs[3] |= Rx7; info->curregs[5] |= Tx7; BAUDBG("7 bits, "); bits = 9; break; case CS8: default: /* defaults to 8 bits */ info->curregs[3] |= Rx8; info->curregs[5] |= Tx8; BAUDBG("8 bits, "); bits = 10; break; } info->pendregs[3] = info->curregs[3]; info->pendregs[5] = info->curregs[5]; info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN); if (cflag & CSTOPB) { info->curregs[4] |= SB2; bits++; BAUDBG("2 stop, "); } else { info->curregs[4] |= SB1; BAUDBG("1 stop, "); } if (cflag & PARENB) { bits++; info->curregs[4] |= PAR_ENA; BAUDBG("parity, "); } if (!(cflag & PARODD)) { info->curregs[4] |= PAR_EVEN; } info->pendregs[4] = info->curregs[4]; if (!(cflag & CLOCAL)) { if (!(info->curregs[15] & DCDIE)) info->read_reg_zero = read_zsreg(info->zs_channel, 0); info->curregs[15] |= DCDIE; } else info->curregs[15] &= ~DCDIE; if (cflag & CRTSCTS) { info->curregs[15] |= CTSIE; if ((read_zsreg(info->zs_channel, 0) & CTS) != 0) info->tx_stopped = 1; } else { info->curregs[15] &= ~CTSIE; info->tx_stopped = 0; } info->pendregs[15] = info->curregs[15]; /* Calc timeout value. This is pretty broken with high baud rates with HZ=100. This code would love a larger HZ and a >1 fifo size, but this is not a priority. The resulting value must be >HZ/2 */ info->timeout = ((info->xmit_fifo_size*HZ*bits) / baud); info->timeout += HZ/50+1; /* Add .02 seconds of slop */ BAUDBG("timeout=%d/%ds, base:%d\n", (int)info->timeout, (int)HZ, (int)info->baud_base); /* set the irda codec to the right rate */ if (info->is_irda) irda_setup(info); /* Load up the new values */ load_zsregs(info->zs_channel, info->curregs); restore_flags(flags); } static void rs_flush_chars(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_flush_chars")) return; if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped || !info->xmit_buf) return; /* Enable transmitter */ transmit_chars(info); } static int rs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, ret = 0; struct mac_serial *info = (struct mac_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_write")) return 0; if (!tty || !info->xmit_buf || !tmp_buf) return 0; if (from_user) { down(&tmp_buf_sem); while (1) { c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) break; c -= copy_from_user(tmp_buf, buf, c); if (!c) { if (!ret) ret = -EFAULT; break; } save_flags(flags); cli(); c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); info->xmit_head = ((info->xmit_head + c) & (SERIAL_XMIT_SIZE-1)); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; ret += c; } up(&tmp_buf_sem); } else { while (1) { save_flags(flags); cli(); c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) { restore_flags(flags); break; } memcpy(info->xmit_buf + info->xmit_head, buf, c); info->xmit_head = ((info->xmit_head + c) & (SERIAL_XMIT_SIZE-1)); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; ret += c; } } if (info->xmit_cnt && !tty->stopped && !info->tx_stopped && !info->tx_active) transmit_chars(info); return ret; } static int rs_write_room(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; int ret; if (serial_paranoia_check(info, tty->device, "rs_write_room")) return 0; ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; if (ret < 0) ret = 0; return ret; } static int rs_chars_in_buffer(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer")) return 0; return info->xmit_cnt; } static void rs_flush_buffer(struct tty_struct *tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_buffer")) return; save_flags(flags); cli(); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; restore_flags(flags); wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * ------------------------------------------------------------ * rs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void rs_throttle(struct tty_struct * tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE printk(KERN_DEBUG "throttle %ld....\n",tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_throttle")) return; if (I_IXOFF(tty)) { save_flags(flags); cli(); info->x_char = STOP_CHAR(tty); if (!info->tx_active) transmit_chars(info); restore_flags(flags); } if (C_CRTSCTS(tty)) { /* * Here we want to turn off the RTS line. On Macintoshes, * the external serial ports using a DIN-8 or DIN-9 * connector only have the DTR line (which is usually * wired to both RTS and DTR on an external modem in * the cable). RTS doesn't go out to the serial port * socket, it acts as an output enable for the transmit * data line. So in this case we don't drop RTS. * * Macs with internal modems generally do have both RTS * and DTR wired to the modem, so in that case we do * drop RTS. */ if (info->is_internal_modem) { save_flags(flags); cli(); info->curregs[5] &= ~RTS; info->pendregs[5] &= ~RTS; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); } } #ifdef CDTRCTS if (tty->termios->c_cflag & CDTRCTS) { save_flags(flags); cli(); info->curregs[5] &= ~DTR; info->pendregs[5] &= ~DTR; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); } #endif /* CDTRCTS */ } static void rs_unthrottle(struct tty_struct * tty) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE printk(KERN_DEBUG "unthrottle %s: %d....\n", tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_unthrottle")) return; if (I_IXOFF(tty)) { save_flags(flags); cli(); if (info->x_char) info->x_char = 0; else { info->x_char = START_CHAR(tty); if (!info->tx_active) transmit_chars(info); } restore_flags(flags); } if (C_CRTSCTS(tty) && info->is_internal_modem) { /* Assert RTS line */ save_flags(flags); cli(); info->curregs[5] |= RTS; info->pendregs[5] |= RTS; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); } #ifdef CDTRCTS if (tty->termios->c_cflag & CDTRCTS) { /* Assert DTR line */ save_flags(flags); cli(); info->curregs[5] |= DTR; info->pendregs[5] |= DTR; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); } #endif } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct mac_serial * info, struct serial_struct * retinfo) { struct serial_struct tmp; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tmp.type = info->type; tmp.line = info->line; tmp.port = info->port; tmp.irq = info->irq; tmp.flags = info->flags; tmp.baud_base = info->baud_base; tmp.close_delay = info->close_delay; tmp.closing_wait = info->closing_wait; tmp.custom_divisor = info->custom_divisor; if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) return -EFAULT; return 0; } static int set_serial_info(struct mac_serial * info, struct serial_struct * new_info) { struct serial_struct new_serial; struct mac_serial old_info; int retval = 0; if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; old_info = *info; if (!capable(CAP_SYS_ADMIN)) { if ((new_serial.baud_base != info->baud_base) || (new_serial.type != info->type) || (new_serial.close_delay != info->close_delay) || ((new_serial.flags & ~ZILOG_USR_MASK) != (info->flags & ~ZILOG_USR_MASK))) return -EPERM; info->flags = ((info->flags & ~ZILOG_USR_MASK) | (new_serial.flags & ZILOG_USR_MASK)); info->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } if (info->count > 1) return -EBUSY; /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ info->baud_base = new_serial.baud_base; info->flags = ((info->flags & ~ZILOG_FLAGS) | (new_serial.flags & ZILOG_FLAGS)); info->type = new_serial.type; info->close_delay = new_serial.close_delay; info->closing_wait = new_serial.closing_wait; check_and_exit: if (info->flags & ZILOG_INITIALIZED) retval = setup_scc(info); return retval; } /* * get_lsr_info - get line status register info * * Purpose: Let user call ioctl() to get info when the UART physically * is emptied. On bus types like RS485, the transmitter must * release the bus after transmitting. This must be done when * the transmit shift register is empty, not be done when the * transmit holding register is empty. This functionality * allows an RS485 driver to be written in user space. */ static int get_lsr_info(struct mac_serial * info, unsigned int *value) { unsigned char status; unsigned long flags; save_flags(flags); cli(); status = read_zsreg(info->zs_channel, 0); restore_flags(flags); status = (status & Tx_BUF_EMP)? TIOCSER_TEMT: 0; return put_user(status,value); } static int get_modem_info(struct mac_serial *info, unsigned int *value) { unsigned char control, status; unsigned int result; unsigned long flags; save_flags(flags); cli(); control = info->curregs[5]; status = read_zsreg(info->zs_channel, 0); restore_flags(flags); result = ((control & RTS) ? TIOCM_RTS: 0) | ((control & DTR) ? TIOCM_DTR: 0) | ((status & DCD) ? TIOCM_CAR: 0) | ((status & CTS) ? 0: TIOCM_CTS); return put_user(result,value); } static int set_modem_info(struct mac_serial *info, unsigned int cmd, unsigned int *value) { unsigned int arg, bits; unsigned long flags; if (get_user(arg, value)) return -EFAULT; bits = (arg & TIOCM_RTS? RTS: 0) + (arg & TIOCM_DTR? DTR: 0); save_flags(flags); cli(); switch (cmd) { case TIOCMBIS: info->curregs[5] |= bits; break; case TIOCMBIC: info->curregs[5] &= ~bits; break; case TIOCMSET: info->curregs[5] = (info->curregs[5] & ~(DTR | RTS)) | bits; break; default: restore_flags(flags); return -EINVAL; } info->pendregs[5] = info->curregs[5]; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); return 0; } /* * rs_break - turn transmit break condition on/off */ static void rs_break(struct tty_struct *tty, int break_state) { struct mac_serial *info = (struct mac_serial *) tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_break")) return; save_flags(flags); cli(); if (break_state == -1) info->curregs[5] |= SND_BRK; else info->curregs[5] &= ~SND_BRK; write_zsreg(info->zs_channel, 5, info->curregs[5]); restore_flags(flags); } static int rs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { struct mac_serial * info = (struct mac_serial *)tty->driver_data; #ifdef CONFIG_KGDB if (info->kgdb_channel) return -ENODEV; #endif if (serial_paranoia_check(info, tty->device, "rs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } switch (cmd) { case TIOCMGET: return get_modem_info(info, (unsigned int *) arg); case TIOCMBIS: case TIOCMBIC: case TIOCMSET: return set_modem_info(info, cmd, (unsigned int *) arg); case TIOCGSERIAL: return get_serial_info(info, (struct serial_struct *) arg); case TIOCSSERIAL: return set_serial_info(info, (struct serial_struct *) arg); case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, (unsigned int *) arg); case TIOCSERGSTRUCT: if (copy_to_user((struct mac_serial *) arg, info, sizeof(struct mac_serial))) return -EFAULT; return 0; default: return -ENOIOCTLCMD; } return 0; } static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct mac_serial *info = (struct mac_serial *)tty->driver_data; int was_stopped; if (tty->termios->c_cflag == old_termios->c_cflag) return; was_stopped = info->tx_stopped; change_speed(info, old_termios); if (was_stopped && !info->tx_stopped) { tty->hw_stopped = 0; rs_start(tty); } } /* * ------------------------------------------------------------ * rs_close() * * This routine is called when the serial port gets closed. * Wait for the last remaining data to be sent. * ------------------------------------------------------------ */ static void rs_close(struct tty_struct *tty, struct file * filp) { struct mac_serial * info = (struct mac_serial *)tty->driver_data; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "rs_close")) return; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { MOD_DEC_USE_COUNT; restore_flags(flags); return; } OPNDBG("rs_close ttyS%d, count = %d\n", info->line, info->count); if ((tty->count == 1) && (info->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. Info->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk(KERN_ERR "rs_close: bad serial port count; tty->count " "is 1, info->count is %d\n", info->count); info->count = 1; } if (--info->count < 0) { printk(KERN_ERR "rs_close: bad serial port count for " "ttyS%d: %d\n", info->line, info->count); info->count = 0; } if (info->count) { MOD_DEC_USE_COUNT; restore_flags(flags); return; } info->flags |= ZILOG_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ZILOG_NORMAL_ACTIVE) info->normal_termios = *tty->termios; if (info->flags & ZILOG_CALLOUT_ACTIVE) info->callout_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ OPNDBG("waiting end of Tx... (timeout:%d)\n", info->closing_wait); tty->closing = 1; if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) { restore_flags(flags); tty_wait_until_sent(tty, info->closing_wait); save_flags(flags); cli(); } /* * At this point we stop accepting input. To do this, we * disable the receiver and receive interrupts. */ info->curregs[3] &= ~RxENABLE; info->pendregs[3] = info->curregs[3]; write_zsreg(info->zs_channel, 3, info->curregs[3]); info->curregs[1] &= ~(0x18); /* disable any rx ints */ info->pendregs[1] = info->curregs[1]; write_zsreg(info->zs_channel, 1, info->curregs[1]); ZS_CLEARFIFO(info->zs_channel); if (info->flags & ZILOG_INITIALIZED) { /* * Before we drop DTR, make sure the SCC transmitter * has completely drained. */ OPNDBG("waiting end of Rx...\n"); restore_flags(flags); rs_wait_until_sent(tty, info->timeout); save_flags(flags); cli(); } shutdown(info); /* restore flags now since shutdown() will have disabled this port's specific irqs */ restore_flags(flags); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE| ZILOG_CLOSING); wake_up_interruptible(&info->close_wait); MOD_DEC_USE_COUNT; } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct mac_serial *info = (struct mac_serial *) tty->driver_data; unsigned long orig_jiffies, char_time; if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent")) return; /* printk("rs_wait_until_sent, timeout:%d, tty_stopped:%d, tx_stopped:%d\n", timeout, tty->stopped, info->tx_stopped); */ orig_jiffies = jiffies; /* * Set the check interval to be 1/5 of the estimated time to * send a single character, and make it at least 1. The check * interval should also be less than the timeout. */ if (info->timeout <= HZ/50) { printk(KERN_INFO "macserial: invalid info->timeout=%d\n", info->timeout); info->timeout = HZ/50+1; } char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; char_time = char_time / 5; if (char_time > HZ) { printk(KERN_WARNING "macserial: char_time %ld >HZ !!!\n", char_time); char_time = 1; } else if (char_time == 0) char_time = 1; if (timeout) char_time = MIN(char_time, timeout); while ((read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } current->state = TASK_RUNNING; } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ static void rs_hangup(struct tty_struct *tty) { struct mac_serial * info = (struct mac_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; rs_flush_buffer(tty); shutdown(info); info->event = 0; info->count = 0; info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct mac_serial *info) { DECLARE_WAITQUEUE(wait,current); int retval; int do_clocal = 0; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (info->flags & ZILOG_CLOSING) { interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ZILOG_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & ZILOG_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ZILOG_CALLOUT_ACTIVE) && (info->flags & ZILOG_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ZILOG_CALLOUT_ACTIVE) && (info->flags & ZILOG_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ZILOG_CALLOUT_ACTIVE; return 0; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { if (info->flags & ZILOG_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ZILOG_NORMAL_ACTIVE; return 0; } if (info->flags & ZILOG_CALLOUT_ACTIVE) { if (info->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; } /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, info->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); OPNDBG("block_til_ready before block: ttyS%d, count = %d\n", info->line, info->count); cli(); if (!tty_hung_up_p(filp)) info->count--; sti(); info->blocked_open++; while (1) { cli(); if (!(info->flags & ZILOG_CALLOUT_ACTIVE) && (tty->termios->c_cflag & CBAUD) && !info->is_irda) zs_rtsdtr(info, 1); sti(); set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(info->flags & ZILOG_INITIALIZED)) { #ifdef SERIAL_DO_RESTART if (info->flags & ZILOG_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } if (!(info->flags & ZILOG_CALLOUT_ACTIVE) && !(info->flags & ZILOG_CLOSING) && (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD))) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } OPNDBG("block_til_ready blocking: ttyS%d, count = %d\n", info->line, info->count); schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (!tty_hung_up_p(filp)) info->count++; info->blocked_open--; OPNDBG("block_til_ready after blocking: ttyS%d, count = %d\n", info->line, info->count); if (retval) return retval; info->flags |= ZILOG_NORMAL_ACTIVE; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its ZILOG structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int rs_open(struct tty_struct *tty, struct file * filp) { struct mac_serial *info; int retval, line; unsigned long page; MOD_INC_USE_COUNT; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= zs_channels_found)) { MOD_DEC_USE_COUNT; return -ENODEV; } info = zs_soft + line; #ifdef CONFIG_KGDB if (info->kgdb_channel) { MOD_DEC_USE_COUNT; return -ENODEV; } #endif if (serial_paranoia_check(info, tty->device, "rs_open")) return -ENODEV; OPNDBG("rs_open %s%d, count = %d, tty=%p\n", tty->driver.name, info->line, info->count, tty); info->count++; tty->driver_data = info; info->tty = tty; if (!tmp_buf) { page = get_free_page(GFP_KERNEL); if (!page) return -ENOMEM; if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ZILOG_CLOSING)) { if (info->flags & ZILOG_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ZILOG_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * Start up serial port */ retval = startup(info); if (retval) return retval; retval = block_til_ready(tty, filp, info); if (retval) { OPNDBG("rs_open returning after block_til_ready with %d\n", retval); return retval; } if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->normal_termios; else *tty->termios = info->callout_termios; change_speed(info, 0); } #ifdef CONFIG_SERIAL_CONSOLE if (sercons.cflag && sercons.index == line) { tty->termios->c_cflag = sercons.cflag; sercons.cflag = 0; change_speed(info, 0); } #endif info->session = current->session; info->pgrp = current->pgrp; OPNDBG("rs_open ttyS%d successful...\n", info->line); return 0; } /* Finally, routines used to initialize the serial driver. */ static void show_serial_version(void) { printk(KERN_INFO "PowerMac Z8530 serial driver version " MACSERIAL_VERSION "\n"); } /* * Initialize one channel, both the mac_serial and mac_zschannel * structs. We use the dev_node field of the mac_serial struct. */ static int chan_init(struct mac_serial *zss, struct mac_zschannel *zs_chan, struct mac_zschannel *zs_chan_a) { struct device_node *ch = zss->dev_node; char *conn; int len; struct slot_names_prop { int count; char name[1]; } *slots; zss->irq = ch->intrs[0].line; zss->has_dma = 0; #if !defined(CONFIG_KGDB) && defined(SUPPORT_SERIAL_DMA) if (ch->n_addrs >= 3 && ch->n_intrs == 3) zss->has_dma = 1; #endif zss->dma_initted = 0; zs_chan->control = (volatile unsigned char *) ioremap(ch->addrs[0].address, 0x1000); zs_chan->data = zs_chan->control + 0x10; spin_lock_init(&zs_chan->lock); zs_chan->parent = zss; zss->zs_channel = zs_chan; zss->zs_chan_a = zs_chan_a; /* setup misc varariables */ zss->kgdb_channel = 0; /* For now, we assume you either have a slot-names property * with "Modem" in it, or your channel is compatible with * "cobalt". Might need additional fixups */ zss->is_internal_modem = device_is_compatible(ch, "cobalt"); conn = get_property(ch, "AAPL,connector", &len); zss->is_irda = conn && (strcmp(conn, "infrared") == 0); zss->port_type = PMAC_SCC_ASYNC; /* 1999 Powerbook G3 has slot-names property instead */ slots = (struct slot_names_prop *)get_property(ch, "slot-names", &len); if (slots && slots->count > 0) { if (strcmp(slots->name, "IrDA") == 0) zss->is_irda = 1; else if (strcmp(slots->name, "Modem") == 0) zss->is_internal_modem = 1; } if (zss->is_irda) zss->port_type = PMAC_SCC_IRDA; if (zss->is_internal_modem) { struct device_node* i2c_modem = find_devices("i2c-modem"); if (i2c_modem) { char* mid = get_property(i2c_modem, "modem-id", NULL); if (mid) switch(*mid) { case 0x04 : case 0x05 : case 0x07 : case 0x08 : case 0x0b : case 0x0c : zss->port_type = PMAC_SCC_I2S1; } printk(KERN_INFO "macserial: i2c-modem detected, id: %d\n", mid ? (*mid) : 0); } else { printk(KERN_INFO "macserial: serial modem detected\n"); } } while (zss->has_dma) { zss->dma_priv = NULL; /* it seems that the last two addresses are the DMA controllers */ zss->tx_dma = (volatile struct dbdma_regs *) ioremap(ch->addrs[ch->n_addrs - 2].address, 0x100); zss->rx = (volatile struct mac_dma *) ioremap(ch->addrs[ch->n_addrs - 1].address, 0x100); zss->tx_dma_irq = ch->intrs[1].line; zss->rx_dma_irq = ch->intrs[2].line; spin_lock_init(&zss->rx_dma_lock); break; } init_timer(&zss->powerup_timer); zss->powerup_timer.function = powerup_done; zss->powerup_timer.data = (unsigned long) zss; return 0; } /* * /proc fs routines. TODO: Add status lines & error stats */ static inline int line_info(char *buf, struct mac_serial *info) { int ret=0; unsigned char* connector; int lenp; ret += sprintf(buf, "%d: port:0x%X irq:%d", info->line, info->port, info->irq); connector = get_property(info->dev_node, "AAPL,connector", &lenp); if (connector) ret+=sprintf(buf+ret," con:%s ", connector); if (info->is_internal_modem) { if (!connector) ret+=sprintf(buf+ret," con:"); ret+=sprintf(buf+ret,"%s", " (internal modem)"); } if (info->is_irda) { if (!connector) ret+=sprintf(buf+ret," con:"); ret+=sprintf(buf+ret,"%s", " (IrDA)"); } ret+=sprintf(buf+ret,"\n"); return ret; } int macserial_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { int l, len = 0; off_t begin = 0; struct mac_serial *info; len += sprintf(page, "serinfo:1.0 driver:" MACSERIAL_VERSION "\n"); for (info = zs_chain; info && len < 4000; info = info->zs_next) { l = line_info(page + len, info); len += l; if (len+begin > off+count) goto done; if (len+begin < off) { begin += len; len = 0; } } *eof = 1; done: if (off >= len+begin) return 0; *start = page + (off-begin); return ((count < begin+len-off) ? count : begin+len-off); } /* Ask the PROM how many Z8530s we have and initialize their zs_channels */ static void probe_sccs() { struct device_node *dev, *ch; struct mac_serial **pp; int n, chip, nchan; struct mac_zschannel *zs_chan; int chan_a_index; n = 0; pp = &zs_chain; zs_chan = zs_channels; for (dev = find_devices("escc"); dev != 0; dev = dev->next) { nchan = 0; chip = n; if (n >= NUM_CHANNELS) { printk(KERN_WARNING "Sorry, can't use %s: no more " "channels\n", dev->full_name); continue; } chan_a_index = 0; for (ch = dev->child; ch != 0; ch = ch->sibling) { if (nchan >= 2) { printk(KERN_WARNING "SCC: Only 2 channels per " "chip are supported\n"); break; } if (ch->n_addrs < 1 || (ch ->n_intrs < 1)) { printk("Can't use %s: %d addrs %d intrs\n", ch->full_name, ch->n_addrs, ch->n_intrs); continue; } /* The channel with the higher address will be the A side. */ if (nchan > 0 && ch->addrs[0].address > zs_soft[n-1].dev_node->addrs[0].address) chan_a_index = 1; /* minimal initialization for now */ zs_soft[n].dev_node = ch; *pp = &zs_soft[n]; pp = &zs_soft[n].zs_next; ++nchan; ++n; } if (nchan == 0) continue; /* set up A side */ if (chan_init(&zs_soft[chip + chan_a_index], zs_chan, zs_chan)) continue; ++zs_chan; /* set up B side, if it exists */ if (nchan > 1) if (chan_init(&zs_soft[chip + 1 - chan_a_index], zs_chan, zs_chan - 1)) continue; ++zs_chan; } *pp = 0; zs_channels_found = n; #ifdef CONFIG_PMAC_PBOOK if (n) pmu_register_sleep_notifier(&serial_sleep_notifier); #endif /* CONFIG_PMAC_PBOOK */ } /* rs_init inits the driver */ int macserial_init(void) { int channel, i; unsigned long flags; struct mac_serial *info; /* Setup base handler, and timer table. */ init_bh(MACSERIAL_BH, do_serial_bh); /* Find out how many Z8530 SCCs we have */ if (zs_chain == 0) probe_sccs(); /* XXX assume it's a powerbook if we have a via-pmu * * This is OK for core99 machines as well. */ is_powerbook = find_devices("via-pmu") != 0; /* Register the interrupt handler for each one * We also request the OF resources here as probe_sccs() * might be called too early for that */ save_flags(flags); cli(); for (i = 0; i < zs_channels_found; ++i) { struct device_node* ch = zs_soft[i].dev_node; if (!request_OF_resource(ch, 0, NULL)) { printk(KERN_ERR "macserial: can't request IO resource !\n"); return -ENODEV; } if (zs_soft[i].has_dma) { if (!request_OF_resource(ch, ch->n_addrs - 2, " (tx dma)")) { printk(KERN_ERR "macserial: can't request TX DMA resource !\n"); zs_soft[i].has_dma = 0; goto no_dma; } if (!request_OF_resource(ch, ch->n_addrs - 1, " (rx dma)")) { release_OF_resource(ch, ch->n_addrs - 2); printk(KERN_ERR "macserial: can't request RX DMA resource !\n"); zs_soft[i].has_dma = 0; goto no_dma; } if (request_irq(zs_soft[i].tx_dma_irq, rs_txdma_irq, 0, "SCC-txdma", &zs_soft[i])) printk(KERN_ERR "macserial: can't get irq %d\n", zs_soft[i].tx_dma_irq); disable_irq(zs_soft[i].tx_dma_irq); if (request_irq(zs_soft[i].rx_dma_irq, rs_rxdma_irq, 0, "SCC-rxdma", &zs_soft[i])) printk(KERN_ERR "macserial: can't get irq %d\n", zs_soft[i].rx_dma_irq); disable_irq(zs_soft[i].rx_dma_irq); } no_dma: if (request_irq(zs_soft[i].irq, rs_interrupt, 0, "SCC", &zs_soft[i])) printk(KERN_ERR "macserial: can't get irq %d\n", zs_soft[i].irq); disable_irq(zs_soft[i].irq); } restore_flags(flags); show_serial_version(); /* Initialize the tty_driver structure */ /* Not all of this is exactly right for us. */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.driver_name = "macserial"; #ifdef CONFIG_DEVFS_FS serial_driver.name = "tts/%d"; #else serial_driver.name = "ttyS"; #endif /* CONFIG_DEVFS_FS */ serial_driver.major = TTY_MAJOR; serial_driver.minor_start = 64; serial_driver.num = zs_channels_found; serial_driver.type = TTY_DRIVER_TYPE_SERIAL; serial_driver.subtype = SERIAL_TYPE_NORMAL; serial_driver.init_termios = tty_std_termios; serial_driver.init_termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; serial_driver.flags = TTY_DRIVER_REAL_RAW; serial_driver.refcount = &serial_refcount; serial_driver.table = serial_table; serial_driver.termios = serial_termios; serial_driver.termios_locked = serial_termios_locked; serial_driver.open = rs_open; serial_driver.close = rs_close; serial_driver.write = rs_write; serial_driver.flush_chars = rs_flush_chars; serial_driver.write_room = rs_write_room; serial_driver.chars_in_buffer = rs_chars_in_buffer; serial_driver.flush_buffer = rs_flush_buffer; serial_driver.ioctl = rs_ioctl; serial_driver.throttle = rs_throttle; serial_driver.unthrottle = rs_unthrottle; serial_driver.set_termios = rs_set_termios; serial_driver.stop = rs_stop; serial_driver.start = rs_start; serial_driver.hangup = rs_hangup; serial_driver.break_ctl = rs_break; serial_driver.wait_until_sent = rs_wait_until_sent; serial_driver.read_proc = macserial_read_proc; /* * The callout device is just like normal device except for * major number and the subtype code. */ callout_driver = serial_driver; #ifdef CONFIG_DEVFS_FS callout_driver.name = "cua/%d"; #else callout_driver.name = "cua"; #endif /* CONFIG_DEVFS_FS */ callout_driver.major = TTYAUX_MAJOR; callout_driver.subtype = SERIAL_TYPE_CALLOUT; callout_driver.read_proc = 0; callout_driver.proc_entry = 0; if (tty_register_driver(&serial_driver)) panic("Couldn't register serial driver\n"); if (tty_register_driver(&callout_driver)) panic("Couldn't register callout driver\n"); for (channel = 0; channel < zs_channels_found; ++channel) { #ifdef CONFIG_KGDB if (zs_soft[channel].kgdb_channel) { kgdb_interruptible(1); continue; } #endif zs_soft[channel].clk_divisor = 16; /* -- we are not sure the SCC is powered ON at this point zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]); */ zs_soft[channel].zs_baud = 38400; /* If console serial line, then enable interrupts. */ if (zs_soft[channel].is_cons) { printk(KERN_INFO "macserial: console line, enabling " "interrupt %d\n", zs_soft[channel].irq); panic("macserial: console not supported yet !"); write_zsreg(zs_soft[channel].zs_channel, R1, (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB)); write_zsreg(zs_soft[channel].zs_channel, R9, (NV | MIE)); } } for (info = zs_chain, i = 0; info; info = info->zs_next, i++) { unsigned char* connector; int lenp; #ifdef CONFIG_KGDB if (info->kgdb_channel) { continue; } #endif info->magic = SERIAL_MAGIC; info->port = (int) info->zs_channel->control; info->line = i; info->tty = 0; info->custom_divisor = 16; info->timeout = 0; info->close_delay = 50; info->closing_wait = 3000; info->x_char = 0; info->event = 0; info->count = 0; info->blocked_open = 0; info->tqueue.routine = do_softint; info->tqueue.data = info; info->callout_termios =callout_driver.init_termios; info->normal_termios = serial_driver.init_termios; init_waitqueue_head(&info->open_wait); init_waitqueue_head(&info->close_wait); info->timeout = HZ; printk(KERN_INFO "tty%02d at 0x%08x (irq = %d)", info->line, info->port, info->irq); printk(" is a Z8530 ESCC"); connector = get_property(info->dev_node, "AAPL,connector", &lenp); if (connector) printk(", port = %s", connector); if (info->is_internal_modem) printk(" (internal modem)"); if (info->is_irda) printk(" (IrDA)"); printk("\n"); } tmp_buf = 0; return 0; } void macserial_cleanup(void) { int i; unsigned long flags; struct mac_serial *info; for (info = zs_chain, i = 0; info; info = info->zs_next, i++) set_scc_power(info, 0); save_flags(flags); cli(); for (i = 0; i < zs_channels_found; ++i) { free_irq(zs_soft[i].irq, &zs_soft[i]); if (zs_soft[i].has_dma) { free_irq(zs_soft[i].tx_dma_irq, &zs_soft[i]); free_irq(zs_soft[i].rx_dma_irq, &zs_soft[i]); } release_OF_resource(zs_soft[i].dev_node, 0); if (zs_soft[i].has_dma) { struct device_node* ch = zs_soft[i].dev_node; release_OF_resource(ch, ch->n_addrs - 2); release_OF_resource(ch, ch->n_addrs - 1); } } restore_flags(flags); tty_unregister_driver(&callout_driver); tty_unregister_driver(&serial_driver); if (tmp_buf) { free_page((unsigned long) tmp_buf); tmp_buf = 0; } #ifdef CONFIG_PMAC_PBOOK if (zs_channels_found) pmu_unregister_sleep_notifier(&serial_sleep_notifier); #endif /* CONFIG_PMAC_PBOOK */ } module_init(macserial_init); module_exit(macserial_cleanup); MODULE_LICENSE("GPL"); EXPORT_NO_SYMBOLS; #if 0 /* * register_serial and unregister_serial allows for serial ports to be * configured at run-time, to support PCMCIA modems. */ /* PowerMac: Unused at this time, just here to make things link. */ int register_serial(struct serial_struct *req) { return -1; } void unregister_serial(int line) { return; } #endif /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ #ifdef CONFIG_SERIAL_CONSOLE /* * Print a string to the serial port trying not to disturb * any possible real use of the port... */ static void serial_console_write(struct console *co, const char *s, unsigned count) { struct mac_serial *info = zs_soft + co->index; int i; /* Turn of interrupts and enable the transmitter. */ write_zsreg(info->zs_channel, R1, info->curregs[1] & ~TxINT_ENAB); write_zsreg(info->zs_channel, R5, info->curregs[5] | TxENAB | RTS | DTR); for (i=0; i<count; i++) { /* Wait for the transmit buffer to empty. */ while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) { eieio(); } write_zsdata(info->zs_channel, s[i]); if (s[i] == 10) { while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) eieio(); write_zsdata(info->zs_channel, 13); } } /* Restore the values in the registers. */ write_zsreg(info->zs_channel, R1, info->curregs[1]); /* Don't disable the transmitter. */ } static kdev_t serial_console_device(struct console *c) { return MKDEV(TTY_MAJOR, 64 + c->index); } /* * Setup initial baud/bits/parity. We do two things here: * - construct a cflag setting for the first rs_open() * - initialize the serial port * Return non-zero if we didn't find a serial port. */ static int __init serial_console_setup(struct console *co, char *options) { struct mac_serial *info; int baud = 38400; int bits = 8; int parity = 'n'; int cflag = CREAD | HUPCL | CLOCAL; int brg; char *s; long flags; /* Find out how many Z8530 SCCs we have */ if (zs_chain == 0) probe_sccs(); if (zs_chain == 0) return -1; /* Do we have the device asked for? */ if (co->index >= zs_channels_found) return -1; info = zs_soft + co->index; set_scc_power(info, 1); /* Reset the channel */ write_zsreg(info->zs_channel, R9, CHRA); if (options) { baud = simple_strtoul(options, NULL, 10); s = options; while(*s >= '0' && *s <= '9') s++; if (*s) parity = *s++; if (*s) bits = *s - '0'; } /* * Now construct a cflag setting. */ switch(baud) { case 1200: cflag |= B1200; break; case 2400: cflag |= B2400; break; case 4800: cflag |= B4800; break; case 9600: cflag |= B9600; break; case 19200: cflag |= B19200; break; case 57600: cflag |= B57600; break; case 115200: cflag |= B115200; break; case 38400: default: cflag |= B38400; break; } switch(bits) { case 7: cflag |= CS7; break; default: case 8: cflag |= CS8; break; } switch(parity) { case 'o': case 'O': cflag |= PARENB | PARODD; break; case 'e': case 'E': cflag |= PARENB; break; } co->cflag = cflag; save_flags(flags); cli(); memset(info->curregs, 0, sizeof(info->curregs)); info->zs_baud = baud; info->clk_divisor = 16; switch (info->zs_baud) { case ZS_CLOCK/16: /* 230400 */ info->curregs[4] = X16CLK; info->curregs[11] = 0; break; case ZS_CLOCK/32: /* 115200 */ info->curregs[4] = X32CLK; info->curregs[11] = 0; break; default: info->curregs[4] = X16CLK; info->curregs[11] = TCBR | RCBR; brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor); info->curregs[12] = (brg & 255); info->curregs[13] = ((brg >> 8) & 255); info->curregs[14] = BRENABL; } /* byte size and parity */ info->curregs[3] &= ~RxNBITS_MASK; info->curregs[5] &= ~TxNBITS_MASK; switch (cflag & CSIZE) { case CS5: info->curregs[3] |= Rx5; info->curregs[5] |= Tx5; break; case CS6: info->curregs[3] |= Rx6; info->curregs[5] |= Tx6; break; case CS7: info->curregs[3] |= Rx7; info->curregs[5] |= Tx7; break; case CS8: default: /* defaults to 8 bits */ info->curregs[3] |= Rx8; info->curregs[5] |= Tx8; break; } info->curregs[5] |= TxENAB | RTS | DTR; info->pendregs[3] = info->curregs[3]; info->pendregs[5] = info->curregs[5]; info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN); if (cflag & CSTOPB) { info->curregs[4] |= SB2; } else { info->curregs[4] |= SB1; } if (cflag & PARENB) { info->curregs[4] |= PAR_ENA; if (!(cflag & PARODD)) { info->curregs[4] |= PAR_EVEN; } } info->pendregs[4] = info->curregs[4]; if (!(cflag & CLOCAL)) { if (!(info->curregs[15] & DCDIE)) info->read_reg_zero = read_zsreg(info->zs_channel, 0); info->curregs[15] |= DCDIE; } else info->curregs[15] &= ~DCDIE; if (cflag & CRTSCTS) { info->curregs[15] |= CTSIE; if ((read_zsreg(info->zs_channel, 0) & CTS) != 0) info->tx_stopped = 1; } else { info->curregs[15] &= ~CTSIE; info->tx_stopped = 0; } info->pendregs[15] = info->curregs[15]; /* Load up the new values */ load_zsregs(info->zs_channel, info->curregs); restore_flags(flags); return 0; } static struct console sercons = { name: "ttyS", write: serial_console_write, device: serial_console_device, setup: serial_console_setup, flags: CON_PRINTBUFFER, index: -1, }; /* * Register console. */ void __init mac_scc_console_init(void) { register_console(&sercons); } #endif /* ifdef CONFIG_SERIAL_CONSOLE */ #ifdef CONFIG_KGDB /* These are for receiving and sending characters under the kgdb * source level kernel debugger. */ void putDebugChar(char kgdb_char) { struct mac_zschannel *chan = zs_kgdbchan; while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0) udelay(5); write_zsdata(chan, kgdb_char); } char getDebugChar(void) { struct mac_zschannel *chan = zs_kgdbchan; while((read_zsreg(chan, 0) & Rx_CH_AV) == 0) eieio(); /*barrier();*/ return read_zsdata(chan); } void kgdb_interruptible(int yes) { struct mac_zschannel *chan = zs_kgdbchan; int one, nine; nine = read_zsreg(chan, 9); if (yes == 1) { one = EXT_INT_ENAB|INT_ALL_Rx; nine |= MIE; printk("turning serial ints on\n"); } else { one = RxINT_DISAB; nine &= ~MIE; printk("turning serial ints off\n"); } write_zsreg(chan, 1, one); write_zsreg(chan, 9, nine); } /* This sets up the serial port we're using, and turns on * interrupts for that channel, so kgdb is usable once we're done. */ static inline void kgdb_chaninit(struct mac_zschannel *ms, int intson, int bps) { int brg; int i, x; volatile char *sccc = ms->control; brg = BPS_TO_BRG(bps, ZS_CLOCK/16); printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg); for (i = 20000; i != 0; --i) { x = *sccc; eieio(); } for (i = 0; i < sizeof(scc_inittab); ++i) { write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]); i++; } } /* This is called at boot time to prime the kgdb serial debugging * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 * for /dev/ttyb which is determined in setup_arch() from the * boot command line flags. * XXX at the moment probably only channel A will work */ void __init zs_kgdb_hook(int tty_num) { /* Find out how many Z8530 SCCs we have */ if (zs_chain == 0) probe_sccs(); set_scc_power(&zs_soft[tty_num], 1); zs_kgdbchan = zs_soft[tty_num].zs_channel; zs_soft[tty_num].change_needed = 0; zs_soft[tty_num].clk_divisor = 16; zs_soft[tty_num].zs_baud = 38400; zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */ /* Turn on transmitter/receiver at 8-bits/char */ kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400); printk("KGDB: on channel %d initialized\n", tty_num); set_debug_traps(); /* init stub */ } #endif /* ifdef CONFIG_KGDB */ #ifdef CONFIG_PMAC_PBOOK /* * notify clients before sleep and reset bus afterwards */ int serial_notify_sleep(struct pmu_sleep_notifier *self, int when) { int i; switch (when) { case PBOOK_SLEEP_REQUEST: case PBOOK_SLEEP_REJECT: break; case PBOOK_SLEEP_NOW: for (i=0; i<zs_channels_found; i++) { struct mac_serial *info = &zs_soft[i]; if (info->flags & ZILOG_INITIALIZED) { shutdown(info); info->flags |= ZILOG_SLEEPING; } } break; case PBOOK_WAKE: for (i=0; i<zs_channels_found; i++) { struct mac_serial *info = &zs_soft[i]; if (info->flags & ZILOG_SLEEPING) { info->flags &= ~ZILOG_SLEEPING; startup(info); } } break; } return PBOOK_SLEEP_OK; } #endif /* CONFIG_PMAC_PBOOK */