diff options
Diffstat (limited to 'drivers/serial/sunsab.c')
| -rw-r--r-- | drivers/serial/sunsab.c | 1152 |
1 files changed, 0 insertions, 1152 deletions
diff --git a/drivers/serial/sunsab.c b/drivers/serial/sunsab.c deleted file mode 100644 index 5b246b18f42..00000000000 --- a/drivers/serial/sunsab.c +++ /dev/null @@ -1,1152 +0,0 @@ -/* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC. - * - * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) - * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net) - * - * Rewrote buffer handling to use CIRC(Circular Buffer) macros. - * Maxim Krasnyanskiy <maxk@qualcomm.com> - * - * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud - * rates to be programmed into the UART. Also eliminated a lot of - * duplicated code in the console setup. - * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12 - * - * Ported to new 2.5.x UART layer. - * David S. Miller <davem@davemloft.net> - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/ptrace.h> -#include <linux/ioport.h> -#include <linux/circ_buf.h> -#include <linux/serial.h> -#include <linux/sysrq.h> -#include <linux/console.h> -#include <linux/spinlock.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/of_device.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/prom.h> - -#if defined(CONFIG_SERIAL_SUNSAB_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/serial_core.h> - -#include "suncore.h" -#include "sunsab.h" - -struct uart_sunsab_port { - struct uart_port port; /* Generic UART port */ - union sab82532_async_regs __iomem *regs; /* Chip registers */ - unsigned long irqflags; /* IRQ state flags */ - int dsr; /* Current DSR state */ - unsigned int cec_timeout; /* Chip poll timeout... */ - unsigned int tec_timeout; /* likewise */ - unsigned char interrupt_mask0;/* ISR0 masking */ - unsigned char interrupt_mask1;/* ISR1 masking */ - unsigned char pvr_dtr_bit; /* Which PVR bit is DTR */ - unsigned char pvr_dsr_bit; /* Which PVR bit is DSR */ - unsigned int gis_shift; - int type; /* SAB82532 version */ - - /* Setting configuration bits while the transmitter is active - * can cause garbage characters to get emitted by the chip. - * Therefore, we cache such writes here and do the real register - * write the next time the transmitter becomes idle. - */ - unsigned int cached_ebrg; - unsigned char cached_mode; - unsigned char cached_pvr; - unsigned char cached_dafo; -}; - -/* - * This assumes you have a 29.4912 MHz clock for your UART. - */ -#define SAB_BASE_BAUD ( 29491200 / 16 ) - -static char *sab82532_version[16] = { - "V1.0", "V2.0", "V3.2", "V(0x03)", - "V(0x04)", "V(0x05)", "V(0x06)", "V(0x07)", - "V(0x08)", "V(0x09)", "V(0x0a)", "V(0x0b)", - "V(0x0c)", "V(0x0d)", "V(0x0e)", "V(0x0f)" -}; - -#define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */ -#define SAB82532_MAX_CEC_TIMEOUT 50000 /* 2.5 TX CLKs (at 50 baud) */ - -#define SAB82532_RECV_FIFO_SIZE 32 /* Standard async fifo sizes */ -#define SAB82532_XMIT_FIFO_SIZE 32 - -static __inline__ void sunsab_tec_wait(struct uart_sunsab_port *up) -{ - int timeout = up->tec_timeout; - - while ((readb(&up->regs->r.star) & SAB82532_STAR_TEC) && --timeout) - udelay(1); -} - -static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up) -{ - int timeout = up->cec_timeout; - - while ((readb(&up->regs->r.star) & SAB82532_STAR_CEC) && --timeout) - udelay(1); -} - -static struct tty_struct * -receive_chars(struct uart_sunsab_port *up, - union sab82532_irq_status *stat) -{ - struct tty_struct *tty = NULL; - unsigned char buf[32]; - int saw_console_brk = 0; - int free_fifo = 0; - int count = 0; - int i; - - if (up->port.state != NULL) /* Unopened serial console */ - tty = up->port.state->port.tty; - - /* Read number of BYTES (Character + Status) available. */ - if (stat->sreg.isr0 & SAB82532_ISR0_RPF) { - count = SAB82532_RECV_FIFO_SIZE; - free_fifo++; - } - - if (stat->sreg.isr0 & SAB82532_ISR0_TCD) { - count = readb(&up->regs->r.rbcl) & (SAB82532_RECV_FIFO_SIZE - 1); - free_fifo++; - } - - /* Issue a FIFO read command in case we where idle. */ - if (stat->sreg.isr0 & SAB82532_ISR0_TIME) { - sunsab_cec_wait(up); - writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr); - return tty; - } - - if (stat->sreg.isr0 & SAB82532_ISR0_RFO) - free_fifo++; - - /* Read the FIFO. */ - for (i = 0; i < count; i++) - buf[i] = readb(&up->regs->r.rfifo[i]); - - /* Issue Receive Message Complete command. */ - if (free_fifo) { - sunsab_cec_wait(up); - writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr); - } - - /* Count may be zero for BRK, so we check for it here */ - if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) && - (up->port.line == up->port.cons->index)) - saw_console_brk = 1; - - for (i = 0; i < count; i++) { - unsigned char ch = buf[i], flag; - - if (tty == NULL) { - uart_handle_sysrq_char(&up->port, ch); - continue; - } - - flag = TTY_NORMAL; - up->port.icount.rx++; - - if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR | - SAB82532_ISR0_FERR | - SAB82532_ISR0_RFO)) || - unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) { - /* - * For statistics only - */ - if (stat->sreg.isr1 & SAB82532_ISR1_BRK) { - stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR | - SAB82532_ISR0_FERR); - up->port.icount.brk++; - /* - * We do the SysRQ and SAK checking - * here because otherwise the break - * may get masked by ignore_status_mask - * or read_status_mask. - */ - if (uart_handle_break(&up->port)) - continue; - } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR) - up->port.icount.parity++; - else if (stat->sreg.isr0 & SAB82532_ISR0_FERR) - up->port.icount.frame++; - if (stat->sreg.isr0 & SAB82532_ISR0_RFO) - up->port.icount.overrun++; - - /* - * Mask off conditions which should be ingored. - */ - stat->sreg.isr0 &= (up->port.read_status_mask & 0xff); - stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff); - - if (stat->sreg.isr1 & SAB82532_ISR1_BRK) { - flag = TTY_BREAK; - } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR) - flag = TTY_PARITY; - else if (stat->sreg.isr0 & SAB82532_ISR0_FERR) - flag = TTY_FRAME; - } - - if (uart_handle_sysrq_char(&up->port, ch)) - continue; - - if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 && - (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0) - tty_insert_flip_char(tty, ch, flag); - if (stat->sreg.isr0 & SAB82532_ISR0_RFO) - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - } - - if (saw_console_brk) - sun_do_break(); - - return tty; -} - -static void sunsab_stop_tx(struct uart_port *); -static void sunsab_tx_idle(struct uart_sunsab_port *); - -static void transmit_chars(struct uart_sunsab_port *up, - union sab82532_irq_status *stat) -{ - struct circ_buf *xmit = &up->port.state->xmit; - int i; - - if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) { - up->interrupt_mask1 |= SAB82532_IMR1_ALLS; - writeb(up->interrupt_mask1, &up->regs->w.imr1); - set_bit(SAB82532_ALLS, &up->irqflags); - } - -#if 0 /* bde@nwlink.com says this check causes problems */ - if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR)) - return; -#endif - - if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW)) - return; - - set_bit(SAB82532_XPR, &up->irqflags); - sunsab_tx_idle(up); - - if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { - up->interrupt_mask1 |= SAB82532_IMR1_XPR; - writeb(up->interrupt_mask1, &up->regs->w.imr1); - return; - } - - up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR); - writeb(up->interrupt_mask1, &up->regs->w.imr1); - clear_bit(SAB82532_ALLS, &up->irqflags); - - /* Stuff 32 bytes into Transmit FIFO. */ - clear_bit(SAB82532_XPR, &up->irqflags); - for (i = 0; i < up->port.fifosize; i++) { - writeb(xmit->buf[xmit->tail], - &up->regs->w.xfifo[i]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - up->port.icount.tx++; - if (uart_circ_empty(xmit)) - break; - } - - /* Issue a Transmit Frame command. */ - sunsab_cec_wait(up); - writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); - - if (uart_circ_empty(xmit)) - sunsab_stop_tx(&up->port); -} - -static void check_status(struct uart_sunsab_port *up, - union sab82532_irq_status *stat) -{ - if (stat->sreg.isr0 & SAB82532_ISR0_CDSC) - uart_handle_dcd_change(&up->port, - !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD)); - - if (stat->sreg.isr1 & SAB82532_ISR1_CSC) - uart_handle_cts_change(&up->port, - (readb(&up->regs->r.star) & SAB82532_STAR_CTS)); - - if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) { - up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1; - up->port.icount.dsr++; - } - - wake_up_interruptible(&up->port.state->port.delta_msr_wait); -} - -static irqreturn_t sunsab_interrupt(int irq, void *dev_id) -{ - struct uart_sunsab_port *up = dev_id; - struct tty_struct *tty; - union sab82532_irq_status status; - unsigned long flags; - unsigned char gis; - - spin_lock_irqsave(&up->port.lock, flags); - - status.stat = 0; - gis = readb(&up->regs->r.gis) >> up->gis_shift; - if (gis & 1) - status.sreg.isr0 = readb(&up->regs->r.isr0); - if (gis & 2) - status.sreg.isr1 = readb(&up->regs->r.isr1); - - tty = NULL; - if (status.stat) { - if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME | - SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) || - (status.sreg.isr1 & SAB82532_ISR1_BRK)) - tty = receive_chars(up, &status); - if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) || - (status.sreg.isr1 & SAB82532_ISR1_CSC)) - check_status(up, &status); - if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR)) - transmit_chars(up, &status); - } - - spin_unlock_irqrestore(&up->port.lock, flags); - - if (tty) - tty_flip_buffer_push(tty); - - return IRQ_HANDLED; -} - -/* port->lock is not held. */ -static unsigned int sunsab_tx_empty(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - int ret; - - /* Do not need a lock for a state test like this. */ - if (test_bit(SAB82532_ALLS, &up->irqflags)) - ret = TIOCSER_TEMT; - else - ret = 0; - - return ret; -} - -/* port->lock held by caller. */ -static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - - if (mctrl & TIOCM_RTS) { - up->cached_mode &= ~SAB82532_MODE_FRTS; - up->cached_mode |= SAB82532_MODE_RTS; - } else { - up->cached_mode |= (SAB82532_MODE_FRTS | - SAB82532_MODE_RTS); - } - if (mctrl & TIOCM_DTR) { - up->cached_pvr &= ~(up->pvr_dtr_bit); - } else { - up->cached_pvr |= up->pvr_dtr_bit; - } - - set_bit(SAB82532_REGS_PENDING, &up->irqflags); - if (test_bit(SAB82532_XPR, &up->irqflags)) - sunsab_tx_idle(up); -} - -/* port->lock is held by caller and interrupts are disabled. */ -static unsigned int sunsab_get_mctrl(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned char val; - unsigned int result; - - result = 0; - - val = readb(&up->regs->r.pvr); - result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR; - - val = readb(&up->regs->r.vstr); - result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR; - - val = readb(&up->regs->r.star); - result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0; - - return result; -} - -/* port->lock held by caller. */ -static void sunsab_stop_tx(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - - up->interrupt_mask1 |= SAB82532_IMR1_XPR; - writeb(up->interrupt_mask1, &up->regs->w.imr1); -} - -/* port->lock held by caller. */ -static void sunsab_tx_idle(struct uart_sunsab_port *up) -{ - if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) { - u8 tmp; - - clear_bit(SAB82532_REGS_PENDING, &up->irqflags); - writeb(up->cached_mode, &up->regs->rw.mode); - writeb(up->cached_pvr, &up->regs->rw.pvr); - writeb(up->cached_dafo, &up->regs->w.dafo); - - writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr); - tmp = readb(&up->regs->rw.ccr2); - tmp &= ~0xc0; - tmp |= (up->cached_ebrg >> 2) & 0xc0; - writeb(tmp, &up->regs->rw.ccr2); - } -} - -/* port->lock held by caller. */ -static void sunsab_start_tx(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - struct circ_buf *xmit = &up->port.state->xmit; - int i; - - up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR); - writeb(up->interrupt_mask1, &up->regs->w.imr1); - - if (!test_bit(SAB82532_XPR, &up->irqflags)) - return; - - clear_bit(SAB82532_ALLS, &up->irqflags); - clear_bit(SAB82532_XPR, &up->irqflags); - - for (i = 0; i < up->port.fifosize; i++) { - writeb(xmit->buf[xmit->tail], - &up->regs->w.xfifo[i]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - up->port.icount.tx++; - if (uart_circ_empty(xmit)) - break; - } - - /* Issue a Transmit Frame command. */ - sunsab_cec_wait(up); - writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr); -} - -/* port->lock is not held. */ -static void sunsab_send_xchar(struct uart_port *port, char ch) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - - sunsab_tec_wait(up); - writeb(ch, &up->regs->w.tic); - - spin_unlock_irqrestore(&up->port.lock, flags); -} - -/* port->lock held by caller. */ -static void sunsab_stop_rx(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - - up->interrupt_mask0 |= SAB82532_IMR0_TCD; - writeb(up->interrupt_mask1, &up->regs->w.imr0); -} - -/* port->lock held by caller. */ -static void sunsab_enable_ms(struct uart_port *port) -{ - /* For now we always receive these interrupts. */ -} - -/* port->lock is not held. */ -static void sunsab_break_ctl(struct uart_port *port, int break_state) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned long flags; - unsigned char val; - - spin_lock_irqsave(&up->port.lock, flags); - - val = up->cached_dafo; - if (break_state) - val |= SAB82532_DAFO_XBRK; - else - val &= ~SAB82532_DAFO_XBRK; - up->cached_dafo = val; - - set_bit(SAB82532_REGS_PENDING, &up->irqflags); - if (test_bit(SAB82532_XPR, &up->irqflags)) - sunsab_tx_idle(up); - - spin_unlock_irqrestore(&up->port.lock, flags); -} - -/* port->lock is not held. */ -static int sunsab_startup(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned long flags; - unsigned char tmp; - int err = request_irq(up->port.irq, sunsab_interrupt, - IRQF_SHARED, "sab", up); - if (err) - return err; - - spin_lock_irqsave(&up->port.lock, flags); - - /* - * Wait for any commands or immediate characters - */ - sunsab_cec_wait(up); - sunsab_tec_wait(up); - - /* - * Clear the FIFO buffers. - */ - writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr); - sunsab_cec_wait(up); - writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr); - - /* - * Clear the interrupt registers. - */ - (void) readb(&up->regs->r.isr0); - (void) readb(&up->regs->r.isr1); - - /* - * Now, initialize the UART - */ - writeb(0, &up->regs->w.ccr0); /* power-down */ - writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ | - SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0); - writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1); - writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL | - SAB82532_CCR2_TOE, &up->regs->w.ccr2); - writeb(0, &up->regs->w.ccr3); - writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4); - up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS | - SAB82532_MODE_RAC); - writeb(up->cached_mode, &up->regs->w.mode); - writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc); - - tmp = readb(&up->regs->rw.ccr0); - tmp |= SAB82532_CCR0_PU; /* power-up */ - writeb(tmp, &up->regs->rw.ccr0); - - /* - * Finally, enable interrupts - */ - up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR | - SAB82532_IMR0_PLLA); - writeb(up->interrupt_mask0, &up->regs->w.imr0); - up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS | - SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN | - SAB82532_IMR1_CSC | SAB82532_IMR1_XON | - SAB82532_IMR1_XPR); - writeb(up->interrupt_mask1, &up->regs->w.imr1); - set_bit(SAB82532_ALLS, &up->irqflags); - set_bit(SAB82532_XPR, &up->irqflags); - - spin_unlock_irqrestore(&up->port.lock, flags); - - return 0; -} - -/* port->lock is not held. */ -static void sunsab_shutdown(struct uart_port *port) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - - /* Disable Interrupts */ - up->interrupt_mask0 = 0xff; - writeb(up->interrupt_mask0, &up->regs->w.imr0); - up->interrupt_mask1 = 0xff; - writeb(up->interrupt_mask1, &up->regs->w.imr1); - - /* Disable break condition */ - up->cached_dafo = readb(&up->regs->rw.dafo); - up->cached_dafo &= ~SAB82532_DAFO_XBRK; - writeb(up->cached_dafo, &up->regs->rw.dafo); - - /* Disable Receiver */ - up->cached_mode &= ~SAB82532_MODE_RAC; - writeb(up->cached_mode, &up->regs->rw.mode); - - /* - * XXX FIXME - * - * If the chip is powered down here the system hangs/crashes during - * reboot or shutdown. This needs to be investigated further, - * similar behaviour occurs in 2.4 when the driver is configured - * as a module only. One hint may be that data is sometimes - * transmitted at 9600 baud during shutdown (regardless of the - * speed the chip was configured for when the port was open). - */ -#if 0 - /* Power Down */ - tmp = readb(&up->regs->rw.ccr0); - tmp &= ~SAB82532_CCR0_PU; - writeb(tmp, &up->regs->rw.ccr0); -#endif - - spin_unlock_irqrestore(&up->port.lock, flags); - free_irq(up->port.irq, up); -} - -/* - * This is used to figure out the divisor speeds. - * - * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)), - * - * with 0 <= N < 64 and 0 <= M < 16 - */ - -static void calc_ebrg(int baud, int *n_ret, int *m_ret) -{ - int n, m; - - if (baud == 0) { - *n_ret = 0; - *m_ret = 0; - return; - } - - /* - * We scale numbers by 10 so that we get better accuracy - * without having to use floating point. Here we increment m - * until n is within the valid range. - */ - n = (SAB_BASE_BAUD * 10) / baud; - m = 0; - while (n >= 640) { - n = n / 2; - m++; - } - n = (n+5) / 10; - /* - * We try very hard to avoid speeds with M == 0 since they may - * not work correctly for XTAL frequences above 10 MHz. - */ - if ((m == 0) && ((n & 1) == 0)) { - n = n / 2; - m++; - } - *n_ret = n - 1; - *m_ret = m; -} - -/* Internal routine, port->lock is held and local interrupts are disabled. */ -static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag, - unsigned int iflag, unsigned int baud, - unsigned int quot) -{ - unsigned char dafo; - int bits, n, m; - - /* Byte size and parity */ - switch (cflag & CSIZE) { - case CS5: dafo = SAB82532_DAFO_CHL5; bits = 7; break; - case CS6: dafo = SAB82532_DAFO_CHL6; bits = 8; break; - case CS7: dafo = SAB82532_DAFO_CHL7; bits = 9; break; - case CS8: dafo = SAB82532_DAFO_CHL8; bits = 10; break; - /* Never happens, but GCC is too dumb to figure it out */ - default: dafo = SAB82532_DAFO_CHL5; bits = 7; break; - } - - if (cflag & CSTOPB) { - dafo |= SAB82532_DAFO_STOP; - bits++; - } - - if (cflag & PARENB) { - dafo |= SAB82532_DAFO_PARE; - bits++; - } - - if (cflag & PARODD) { - dafo |= SAB82532_DAFO_PAR_ODD; - } else { - dafo |= SAB82532_DAFO_PAR_EVEN; - } - up->cached_dafo = dafo; - - calc_ebrg(baud, &n, &m); - - up->cached_ebrg = n | (m << 6); - - up->tec_timeout = (10 * 1000000) / baud; - up->cec_timeout = up->tec_timeout >> 2; - - /* CTS flow control flags */ - /* We encode read_status_mask and ignore_status_mask like so: - * - * --------------------- - * | ... | ISR1 | ISR0 | - * --------------------- - * .. 15 8 7 0 - */ - - up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME | - SAB82532_ISR0_RFO | SAB82532_ISR0_RPF | - SAB82532_ISR0_CDSC); - up->port.read_status_mask |= (SAB82532_ISR1_CSC | - SAB82532_ISR1_ALLS | - SAB82532_ISR1_XPR) << 8; - if (iflag & INPCK) - up->port.read_status_mask |= (SAB82532_ISR0_PERR | - SAB82532_ISR0_FERR); - if (iflag & (BRKINT | PARMRK)) - up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8); - - /* - * Characteres to ignore - */ - up->port.ignore_status_mask = 0; - if (iflag & IGNPAR) - up->port.ignore_status_mask |= (SAB82532_ISR0_PERR | - SAB82532_ISR0_FERR); - if (iflag & IGNBRK) { - up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8); - /* - * If we're ignoring parity and break indicators, - * ignore overruns too (for real raw support). - */ - if (iflag & IGNPAR) - up->port.ignore_status_mask |= SAB82532_ISR0_RFO; - } - - /* - * ignore all characters if CREAD is not set - */ - if ((cflag & CREAD) == 0) - up->port.ignore_status_mask |= (SAB82532_ISR0_RPF | - SAB82532_ISR0_TCD); - - uart_update_timeout(&up->port, cflag, - (up->port.uartclk / (16 * quot))); - - /* Now schedule a register update when the chip's - * transmitter is idle. - */ - up->cached_mode |= SAB82532_MODE_RAC; - set_bit(SAB82532_REGS_PENDING, &up->irqflags); - if (test_bit(SAB82532_XPR, &up->irqflags)) - sunsab_tx_idle(up); -} - -/* port->lock is not held. */ -static void sunsab_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *) port; - unsigned long flags; - unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000); - unsigned int quot = uart_get_divisor(port, baud); - - spin_lock_irqsave(&up->port.lock, flags); - sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static const char *sunsab_type(struct uart_port *port) -{ - struct uart_sunsab_port *up = (void *)port; - static char buf[36]; - - sprintf(buf, "SAB82532 %s", sab82532_version[up->type]); - return buf; -} - -static void sunsab_release_port(struct uart_port *port) -{ -} - -static int sunsab_request_port(struct uart_port *port) -{ - return 0; -} - -static void sunsab_config_port(struct uart_port *port, int flags) -{ -} - -static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - return -EINVAL; -} - -static struct uart_ops sunsab_pops = { - .tx_empty = sunsab_tx_empty, - .set_mctrl = sunsab_set_mctrl, - .get_mctrl = sunsab_get_mctrl, - .stop_tx = sunsab_stop_tx, - .start_tx = sunsab_start_tx, - .send_xchar = sunsab_send_xchar, - .stop_rx = sunsab_stop_rx, - .enable_ms = sunsab_enable_ms, - .break_ctl = sunsab_break_ctl, - .startup = sunsab_startup, - .shutdown = sunsab_shutdown, - .set_termios = sunsab_set_termios, - .type = sunsab_type, - .release_port = sunsab_release_port, - .request_port = sunsab_request_port, - .config_port = sunsab_config_port, - .verify_port = sunsab_verify_port, -}; - -static struct uart_driver sunsab_reg = { - .owner = THIS_MODULE, - .driver_name = "sunsab", - .dev_name = "ttyS", - .major = TTY_MAJOR, -}; - -static struct uart_sunsab_port *sunsab_ports; - -#ifdef CONFIG_SERIAL_SUNSAB_CONSOLE - -static void sunsab_console_putchar(struct uart_port *port, int c) -{ - struct uart_sunsab_port *up = (struct uart_sunsab_port *)port; - - sunsab_tec_wait(up); - writeb(c, &up->regs->w.tic); -} - -static void sunsab_console_write(struct console *con, const char *s, unsigned n) -{ - struct uart_sunsab_port *up = &sunsab_ports[con->index]; - unsigned long flags; - int locked = 1; - - local_irq_save(flags); - if (up->port.sysrq) { - locked = 0; - } else if (oops_in_progress) { - locked = spin_trylock(&up->port.lock); - } else - spin_lock(&up->port.lock); - - uart_console_write(&up->port, s, n, sunsab_console_putchar); - sunsab_tec_wait(up); - - if (locked) - spin_unlock(&up->port.lock); - local_irq_restore(flags); -} - -static int sunsab_console_setup(struct console *con, char *options) -{ - struct uart_sunsab_port *up = &sunsab_ports[con->index]; - unsigned long flags; - unsigned int baud, quot; - - /* - * The console framework calls us for each and every port - * registered. Defer the console setup until the requested - * port has been properly discovered. A bit of a hack, - * though... - */ - if (up->port.type != PORT_SUNSAB) - return -1; - - printk("Console: ttyS%d (SAB82532)\n", - (sunsab_reg.minor - 64) + con->index); - - sunserial_console_termios(con, up->port.dev->of_node); - - switch (con->cflag & CBAUD) { - case B150: baud = 150; break; - case B300: baud = 300; break; - case B600: baud = 600; break; - case B1200: baud = 1200; break; - case B2400: baud = 2400; break; - case B4800: baud = 4800; break; - default: case B9600: baud = 9600; break; - case B19200: baud = 19200; break; - case B38400: baud = 38400; break; - case B57600: baud = 57600; break; - case B115200: baud = 115200; break; - case B230400: baud = 230400; break; - case B460800: baud = 460800; break; - }; - - /* - * Temporary fix. - */ - spin_lock_init(&up->port.lock); - - /* - * Initialize the hardware - */ - sunsab_startup(&up->port); - - spin_lock_irqsave(&up->port.lock, flags); - - /* - * Finally, enable interrupts - */ - up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR | - SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC; - writeb(up->interrupt_mask0, &up->regs->w.imr0); - up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS | - SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN | - SAB82532_IMR1_CSC | SAB82532_IMR1_XON | - SAB82532_IMR1_XPR; - writeb(up->interrupt_mask1, &up->regs->w.imr1); - - quot = uart_get_divisor(&up->port, baud); - sunsab_convert_to_sab(up, con->cflag, 0, baud, quot); - sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS); - - spin_unlock_irqrestore(&up->port.lock, flags); - - return 0; -} - -static struct console sunsab_console = { - .name = "ttyS", - .write = sunsab_console_write, - .device = uart_console_device, - .setup = sunsab_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &sunsab_reg, -}; - -static inline struct console *SUNSAB_CONSOLE(void) -{ - return &sunsab_console; -} -#else -#define SUNSAB_CONSOLE() (NULL) -#define sunsab_console_init() do { } while (0) -#endif - -static int __devinit sunsab_init_one(struct uart_sunsab_port *up, - struct platform_device *op, - unsigned long offset, - int line) -{ - up->port.line = line; - up->port.dev = &op->dev; - - up->port.mapbase = op->resource[0].start + offset; - up->port.membase = of_ioremap(&op->resource[0], offset, - sizeof(union sab82532_async_regs), - "sab"); - if (!up->port.membase) - return -ENOMEM; - up->regs = (union sab82532_async_regs __iomem *) up->port.membase; - - up->port.irq = op->archdata.irqs[0]; - - up->port.fifosize = SAB82532_XMIT_FIFO_SIZE; - up->port.iotype = UPIO_MEM; - - writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc); - - up->port.ops = &sunsab_pops; - up->port.type = PORT_SUNSAB; - up->port.uartclk = SAB_BASE_BAUD; - - up->type = readb(&up->regs->r.vstr) & 0x0f; - writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr); - writeb(0xff, &up->regs->w.pim); - if ((up->port.line & 0x1) == 0) { - up->pvr_dsr_bit = (1 << 0); - up->pvr_dtr_bit = (1 << 1); - up->gis_shift = 2; - } else { - up->pvr_dsr_bit = (1 << 3); - up->pvr_dtr_bit = (1 << 2); - up->gis_shift = 0; - } - up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4); - writeb(up->cached_pvr, &up->regs->w.pvr); - up->cached_mode = readb(&up->regs->rw.mode); - up->cached_mode |= SAB82532_MODE_FRTS; - writeb(up->cached_mode, &up->regs->rw.mode); - up->cached_mode |= SAB82532_MODE_RTS; - writeb(up->cached_mode, &up->regs->rw.mode); - - up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT; - up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT; - - return 0; -} - -static int __devinit sab_probe(struct platform_device *op, const struct of_device_id *match) -{ - static int inst; - struct uart_sunsab_port *up; - int err; - - up = &sunsab_ports[inst * 2]; - - err = sunsab_init_one(&up[0], op, - 0, - (inst * 2) + 0); - if (err) - goto out; - - err = sunsab_init_one(&up[1], op, - sizeof(union sab82532_async_regs), - (inst * 2) + 1); - if (err) - goto out1; - - sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node, - &sunsab_reg, up[0].port.line, - false); - - sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node, - &sunsab_reg, up[1].port.line, - false); - - err = uart_add_one_port(&sunsab_reg, &up[0].port); - if (err) - goto out2; - - err = uart_add_one_port(&sunsab_reg, &up[1].port); - if (err) - goto out3; - - dev_set_drvdata(&op->dev, &up[0]); - - inst++; - - return 0; - -out3: - uart_remove_one_port(&sunsab_reg, &up[0].port); -out2: - of_iounmap(&op->resource[0], - up[1].port.membase, - sizeof(union sab82532_async_regs)); -out1: - of_iounmap(&op->resource[0], - up[0].port.membase, - sizeof(union sab82532_async_regs)); -out: - return err; -} - -static int __devexit sab_remove(struct platform_device *op) -{ - struct uart_sunsab_port *up = dev_get_drvdata(&op->dev); - - uart_remove_one_port(&sunsab_reg, &up[1].port); - uart_remove_one_port(&sunsab_reg, &up[0].port); - of_iounmap(&op->resource[0], - up[1].port.membase, - sizeof(union sab82532_async_regs)); - of_iounmap(&op->resource[0], - up[0].port.membase, - sizeof(union sab82532_async_regs)); - - dev_set_drvdata(&op->dev, NULL); - - return 0; -} - -static const struct of_device_id sab_match[] = { - { - .name = "se", - }, - { - .name = "serial", - .compatible = "sab82532", - }, - {}, -}; -MODULE_DEVICE_TABLE(of, sab_match); - -static struct of_platform_driver sab_driver = { - .driver = { - .name = "sab", - .owner = THIS_MODULE, - .of_match_table = sab_match, - }, - .probe = sab_probe, - .remove = __devexit_p(sab_remove), -}; - -static int __init sunsab_init(void) -{ - struct device_node *dp; - int err; - int num_channels = 0; - - for_each_node_by_name(dp, "se") - num_channels += 2; - for_each_node_by_name(dp, "serial") { - if (of_device_is_compatible(dp, "sab82532")) - num_channels += 2; - } - - if (num_channels) { - sunsab_ports = kzalloc(sizeof(struct uart_sunsab_port) * - num_channels, GFP_KERNEL); - if (!sunsab_ports) - return -ENOMEM; - - err = sunserial_register_minors(&sunsab_reg, num_channels); - if (err) { - kfree(sunsab_ports); - sunsab_ports = NULL; - - return err; - } - } - - return of_register_platform_driver(&sab_driver); -} - -static void __exit sunsab_exit(void) -{ - of_unregister_platform_driver(&sab_driver); - if (sunsab_reg.nr) { - sunserial_unregister_minors(&sunsab_reg, sunsab_reg.nr); - } - - kfree(sunsab_ports); - sunsab_ports = NULL; -} - -module_init(sunsab_init); -module_exit(sunsab_exit); - -MODULE_AUTHOR("Eddie C. Dost and David S. Miller"); -MODULE_DESCRIPTION("Sun SAB82532 serial port driver"); -MODULE_LICENSE("GPL"); |