| /* |
| * linux/drivers/serial/cpm_uart.c |
| * |
| * Driver for CPM (SCC/SMC) serial ports; core driver |
| * |
| * Based on arch/ppc/cpm2_io/uart.c by Dan Malek |
| * Based on ppc8xx.c by Thomas Gleixner |
| * Based on drivers/serial/amba.c by Russell King |
| * |
| * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2) |
| * Pantelis Antoniou (panto@intracom.gr) (CPM1) |
| * |
| * Copyright (C) 2004 Freescale Semiconductor, Inc. |
| * (C) 2004 Intracom, S.A. |
| * (C) 2005 MontaVista Software, Inc. by Vitaly Bordug <vbordug@ru.mvista.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/tty.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/serial.h> |
| #include <linux/console.h> |
| #include <linux/sysrq.h> |
| #include <linux/device.h> |
| #include <linux/bootmem.h> |
| #include <linux/dma-mapping.h> |
| |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| #include <asm/delay.h> |
| |
| #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| #define SUPPORT_SYSRQ |
| #endif |
| |
| #include <linux/serial_core.h> |
| #include <linux/kernel.h> |
| |
| #include "cpm_uart.h" |
| |
| /***********************************************************************/ |
| |
| /* Track which ports are configured as uarts */ |
| int cpm_uart_port_map[UART_NR]; |
| /* How many ports did we config as uarts */ |
| int cpm_uart_nr; |
| |
| /**************************************************************/ |
| |
| static int cpm_uart_tx_pump(struct uart_port *port); |
| static void cpm_uart_init_smc(struct uart_cpm_port *pinfo); |
| static void cpm_uart_init_scc(struct uart_cpm_port *pinfo); |
| static void cpm_uart_initbd(struct uart_cpm_port *pinfo); |
| |
| /**************************************************************/ |
| |
| static inline unsigned long cpu2cpm_addr(void *addr) |
| { |
| if ((unsigned long)addr >= CPM_ADDR) |
| return (unsigned long)addr; |
| return virt_to_bus(addr); |
| } |
| |
| static inline void *cpm2cpu_addr(unsigned long addr) |
| { |
| if (addr >= CPM_ADDR) |
| return (void *)addr; |
| return bus_to_virt(addr); |
| } |
| |
| /* |
| * Check, if transmit buffers are processed |
| */ |
| static unsigned int cpm_uart_tx_empty(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile cbd_t *bdp = pinfo->tx_bd_base; |
| int ret = 0; |
| |
| while (1) { |
| if (bdp->cbd_sc & BD_SC_READY) |
| break; |
| |
| if (bdp->cbd_sc & BD_SC_WRAP) { |
| ret = TIOCSER_TEMT; |
| break; |
| } |
| bdp++; |
| } |
| |
| pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret); |
| |
| return ret; |
| } |
| |
| static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| { |
| /* Whee. Do nothing. */ |
| } |
| |
| static unsigned int cpm_uart_get_mctrl(struct uart_port *port) |
| { |
| /* Whee. Do nothing. */ |
| return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; |
| } |
| |
| /* |
| * Stop transmitter |
| */ |
| static void cpm_uart_stop_tx(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile smc_t *smcp = pinfo->smcp; |
| volatile scc_t *sccp = pinfo->sccp; |
| |
| pr_debug("CPM uart[%d]:stop tx\n", port->line); |
| |
| if (IS_SMC(pinfo)) |
| smcp->smc_smcm &= ~SMCM_TX; |
| else |
| sccp->scc_sccm &= ~UART_SCCM_TX; |
| } |
| |
| /* |
| * Start transmitter |
| */ |
| static void cpm_uart_start_tx(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile smc_t *smcp = pinfo->smcp; |
| volatile scc_t *sccp = pinfo->sccp; |
| |
| pr_debug("CPM uart[%d]:start tx\n", port->line); |
| |
| if (IS_SMC(pinfo)) { |
| if (smcp->smc_smcm & SMCM_TX) |
| return; |
| } else { |
| if (sccp->scc_sccm & UART_SCCM_TX) |
| return; |
| } |
| |
| if (cpm_uart_tx_pump(port) != 0) { |
| if (IS_SMC(pinfo)) { |
| smcp->smc_smcm |= SMCM_TX; |
| smcp->smc_smcmr |= SMCMR_TEN; |
| } else { |
| sccp->scc_sccm |= UART_SCCM_TX; |
| pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENT; |
| } |
| } |
| } |
| |
| /* |
| * Stop receiver |
| */ |
| static void cpm_uart_stop_rx(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile smc_t *smcp = pinfo->smcp; |
| volatile scc_t *sccp = pinfo->sccp; |
| |
| pr_debug("CPM uart[%d]:stop rx\n", port->line); |
| |
| if (IS_SMC(pinfo)) |
| smcp->smc_smcm &= ~SMCM_RX; |
| else |
| sccp->scc_sccm &= ~UART_SCCM_RX; |
| } |
| |
| /* |
| * Enable Modem status interrupts |
| */ |
| static void cpm_uart_enable_ms(struct uart_port *port) |
| { |
| pr_debug("CPM uart[%d]:enable ms\n", port->line); |
| } |
| |
| /* |
| * Generate a break. |
| */ |
| static void cpm_uart_break_ctl(struct uart_port *port, int break_state) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| int line = pinfo - cpm_uart_ports; |
| |
| pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line, |
| break_state); |
| |
| if (break_state) |
| cpm_line_cr_cmd(line, CPM_CR_STOP_TX); |
| else |
| cpm_line_cr_cmd(line, CPM_CR_RESTART_TX); |
| } |
| |
| /* |
| * Transmit characters, refill buffer descriptor, if possible |
| */ |
| static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs) |
| { |
| pr_debug("CPM uart[%d]:TX INT\n", port->line); |
| |
| cpm_uart_tx_pump(port); |
| } |
| |
| /* |
| * Receive characters |
| */ |
| static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs) |
| { |
| int i; |
| unsigned char ch, *cp; |
| struct tty_struct *tty = port->info->tty; |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile cbd_t *bdp; |
| u16 status; |
| unsigned int flg; |
| |
| pr_debug("CPM uart[%d]:RX INT\n", port->line); |
| |
| /* Just loop through the closed BDs and copy the characters into |
| * the buffer. |
| */ |
| bdp = pinfo->rx_cur; |
| for (;;) { |
| /* get status */ |
| status = bdp->cbd_sc; |
| /* If this one is empty, return happy */ |
| if (status & BD_SC_EMPTY) |
| break; |
| |
| /* get number of characters, and check spce in flip-buffer */ |
| i = bdp->cbd_datlen; |
| |
| /* If we have not enough room in tty flip buffer, then we try |
| * later, which will be the next rx-interrupt or a timeout |
| */ |
| if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) { |
| tty->flip.work.func((void *)tty); |
| if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) { |
| printk(KERN_WARNING "TTY_DONT_FLIP set\n"); |
| return; |
| } |
| } |
| |
| /* get pointer */ |
| cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
| |
| /* loop through the buffer */ |
| while (i-- > 0) { |
| ch = *cp++; |
| port->icount.rx++; |
| flg = TTY_NORMAL; |
| |
| if (status & |
| (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV)) |
| goto handle_error; |
| if (uart_handle_sysrq_char(port, ch, regs)) |
| continue; |
| |
| error_return: |
| *tty->flip.char_buf_ptr++ = ch; |
| *tty->flip.flag_buf_ptr++ = flg; |
| tty->flip.count++; |
| |
| } /* End while (i--) */ |
| |
| /* This BD is ready to be used again. Clear status. get next */ |
| bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID); |
| bdp->cbd_sc |= BD_SC_EMPTY; |
| |
| if (bdp->cbd_sc & BD_SC_WRAP) |
| bdp = pinfo->rx_bd_base; |
| else |
| bdp++; |
| |
| } /* End for (;;) */ |
| |
| /* Write back buffer pointer */ |
| pinfo->rx_cur = (volatile cbd_t *) bdp; |
| |
| /* activate BH processing */ |
| tty_flip_buffer_push(tty); |
| |
| return; |
| |
| /* Error processing */ |
| |
| handle_error: |
| /* Statistics */ |
| if (status & BD_SC_BR) |
| port->icount.brk++; |
| if (status & BD_SC_PR) |
| port->icount.parity++; |
| if (status & BD_SC_FR) |
| port->icount.frame++; |
| if (status & BD_SC_OV) |
| port->icount.overrun++; |
| |
| /* Mask out ignored conditions */ |
| status &= port->read_status_mask; |
| |
| /* Handle the remaining ones */ |
| if (status & BD_SC_BR) |
| flg = TTY_BREAK; |
| else if (status & BD_SC_PR) |
| flg = TTY_PARITY; |
| else if (status & BD_SC_FR) |
| flg = TTY_FRAME; |
| |
| /* overrun does not affect the current character ! */ |
| if (status & BD_SC_OV) { |
| ch = 0; |
| flg = TTY_OVERRUN; |
| /* We skip this buffer */ |
| /* CHECK: Is really nothing senseful there */ |
| /* ASSUMPTION: it contains nothing valid */ |
| i = 0; |
| } |
| #ifdef SUPPORT_SYSRQ |
| port->sysrq = 0; |
| #endif |
| goto error_return; |
| } |
| |
| /* |
| * Asynchron mode interrupt handler |
| */ |
| static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs) |
| { |
| u8 events; |
| struct uart_port *port = (struct uart_port *)data; |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile smc_t *smcp = pinfo->smcp; |
| volatile scc_t *sccp = pinfo->sccp; |
| |
| pr_debug("CPM uart[%d]:IRQ\n", port->line); |
| |
| if (IS_SMC(pinfo)) { |
| events = smcp->smc_smce; |
| smcp->smc_smce = events; |
| if (events & SMCM_BRKE) |
| uart_handle_break(port); |
| if (events & SMCM_RX) |
| cpm_uart_int_rx(port, regs); |
| if (events & SMCM_TX) |
| cpm_uart_int_tx(port, regs); |
| } else { |
| events = sccp->scc_scce; |
| sccp->scc_scce = events; |
| if (events & UART_SCCM_BRKE) |
| uart_handle_break(port); |
| if (events & UART_SCCM_RX) |
| cpm_uart_int_rx(port, regs); |
| if (events & UART_SCCM_TX) |
| cpm_uart_int_tx(port, regs); |
| } |
| return (events) ? IRQ_HANDLED : IRQ_NONE; |
| } |
| |
| static int cpm_uart_startup(struct uart_port *port) |
| { |
| int retval; |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| int line = pinfo - cpm_uart_ports; |
| |
| pr_debug("CPM uart[%d]:startup\n", port->line); |
| |
| /* Install interrupt handler. */ |
| retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port); |
| if (retval) |
| return retval; |
| |
| /* Startup rx-int */ |
| if (IS_SMC(pinfo)) { |
| pinfo->smcp->smc_smcm |= SMCM_RX; |
| pinfo->smcp->smc_smcmr |= SMCMR_REN; |
| } else { |
| pinfo->sccp->scc_sccm |= UART_SCCM_RX; |
| } |
| |
| if (!(pinfo->flags & FLAG_CONSOLE)) |
| cpm_line_cr_cmd(line,CPM_CR_INIT_TRX); |
| return 0; |
| } |
| |
| inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo) |
| { |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(pinfo->wait_closing); |
| } |
| |
| /* |
| * Shutdown the uart |
| */ |
| static void cpm_uart_shutdown(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| int line = pinfo - cpm_uart_ports; |
| |
| pr_debug("CPM uart[%d]:shutdown\n", port->line); |
| |
| /* free interrupt handler */ |
| free_irq(port->irq, port); |
| |
| /* If the port is not the console, disable Rx and Tx. */ |
| if (!(pinfo->flags & FLAG_CONSOLE)) { |
| /* Wait for all the BDs marked sent */ |
| while(!cpm_uart_tx_empty(port)) { |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(2); |
| } |
| |
| if (pinfo->wait_closing) |
| cpm_uart_wait_until_send(pinfo); |
| |
| /* Stop uarts */ |
| if (IS_SMC(pinfo)) { |
| volatile smc_t *smcp = pinfo->smcp; |
| smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| } else { |
| volatile scc_t *sccp = pinfo->sccp; |
| sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| } |
| |
| /* Shut them really down and reinit buffer descriptors */ |
| cpm_line_cr_cmd(line, CPM_CR_STOP_TX); |
| cpm_uart_initbd(pinfo); |
| } |
| } |
| |
| static void cpm_uart_set_termios(struct uart_port *port, |
| struct termios *termios, struct termios *old) |
| { |
| int baud; |
| unsigned long flags; |
| u16 cval, scval, prev_mode; |
| int bits, sbits; |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| volatile smc_t *smcp = pinfo->smcp; |
| volatile scc_t *sccp = pinfo->sccp; |
| |
| pr_debug("CPM uart[%d]:set_termios\n", port->line); |
| |
| baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); |
| |
| /* Character length programmed into the mode register is the |
| * sum of: 1 start bit, number of data bits, 0 or 1 parity bit, |
| * 1 or 2 stop bits, minus 1. |
| * The value 'bits' counts this for us. |
| */ |
| cval = 0; |
| scval = 0; |
| |
| /* byte size */ |
| switch (termios->c_cflag & CSIZE) { |
| case CS5: |
| bits = 5; |
| break; |
| case CS6: |
| bits = 6; |
| break; |
| case CS7: |
| bits = 7; |
| break; |
| case CS8: |
| bits = 8; |
| break; |
| /* Never happens, but GCC is too dumb to figure it out */ |
| default: |
| bits = 8; |
| break; |
| } |
| sbits = bits - 5; |
| |
| if (termios->c_cflag & CSTOPB) { |
| cval |= SMCMR_SL; /* Two stops */ |
| scval |= SCU_PSMR_SL; |
| bits++; |
| } |
| |
| if (termios->c_cflag & PARENB) { |
| cval |= SMCMR_PEN; |
| scval |= SCU_PSMR_PEN; |
| bits++; |
| if (!(termios->c_cflag & PARODD)) { |
| cval |= SMCMR_PM_EVEN; |
| scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP); |
| } |
| } |
| |
| /* |
| * Set up parity check flag |
| */ |
| #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
| |
| port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV); |
| if (termios->c_iflag & INPCK) |
| port->read_status_mask |= BD_SC_FR | BD_SC_PR; |
| if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK)) |
| port->read_status_mask |= BD_SC_BR; |
| |
| /* |
| * Characters to ignore |
| */ |
| port->ignore_status_mask = 0; |
| if (termios->c_iflag & IGNPAR) |
| port->ignore_status_mask |= BD_SC_PR | BD_SC_FR; |
| if (termios->c_iflag & IGNBRK) { |
| port->ignore_status_mask |= BD_SC_BR; |
| /* |
| * If we're ignore parity and break indicators, ignore |
| * overruns too. (For real raw support). |
| */ |
| if (termios->c_iflag & IGNPAR) |
| port->ignore_status_mask |= BD_SC_OV; |
| } |
| /* |
| * !!! ignore all characters if CREAD is not set |
| */ |
| if ((termios->c_cflag & CREAD) == 0) |
| port->read_status_mask &= ~BD_SC_EMPTY; |
| |
| spin_lock_irqsave(&port->lock, flags); |
| |
| /* Start bit has not been added (so don't, because we would just |
| * subtract it later), and we need to add one for the number of |
| * stops bits (there is always at least one). |
| */ |
| bits++; |
| if (IS_SMC(pinfo)) { |
| /* Set the mode register. We want to keep a copy of the |
| * enables, because we want to put them back if they were |
| * present. |
| */ |
| prev_mode = smcp->smc_smcmr; |
| smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART; |
| smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN)); |
| } else { |
| sccp->scc_psmr = (sbits << 12) | scval; |
| } |
| |
| cpm_set_brg(pinfo->brg - 1, baud); |
| spin_unlock_irqrestore(&port->lock, flags); |
| |
| } |
| |
| static const char *cpm_uart_type(struct uart_port *port) |
| { |
| pr_debug("CPM uart[%d]:uart_type\n", port->line); |
| |
| return port->type == PORT_CPM ? "CPM UART" : NULL; |
| } |
| |
| /* |
| * verify the new serial_struct (for TIOCSSERIAL). |
| */ |
| static int cpm_uart_verify_port(struct uart_port *port, |
| struct serial_struct *ser) |
| { |
| int ret = 0; |
| |
| pr_debug("CPM uart[%d]:verify_port\n", port->line); |
| |
| if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM) |
| ret = -EINVAL; |
| if (ser->irq < 0 || ser->irq >= NR_IRQS) |
| ret = -EINVAL; |
| if (ser->baud_base < 9600) |
| ret = -EINVAL; |
| return ret; |
| } |
| |
| /* |
| * Transmit characters, refill buffer descriptor, if possible |
| */ |
| static int cpm_uart_tx_pump(struct uart_port *port) |
| { |
| volatile cbd_t *bdp; |
| unsigned char *p; |
| int count; |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| struct circ_buf *xmit = &port->info->xmit; |
| |
| /* Handle xon/xoff */ |
| if (port->x_char) { |
| /* Pick next descriptor and fill from buffer */ |
| bdp = pinfo->tx_cur; |
| |
| p = cpm2cpu_addr(bdp->cbd_bufaddr); |
| |
| *p++ = xmit->buf[xmit->tail]; |
| bdp->cbd_datlen = 1; |
| bdp->cbd_sc |= BD_SC_READY; |
| /* Get next BD. */ |
| if (bdp->cbd_sc & BD_SC_WRAP) |
| bdp = pinfo->tx_bd_base; |
| else |
| bdp++; |
| pinfo->tx_cur = bdp; |
| |
| port->icount.tx++; |
| port->x_char = 0; |
| return 1; |
| } |
| |
| if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
| cpm_uart_stop_tx(port); |
| return 0; |
| } |
| |
| /* Pick next descriptor and fill from buffer */ |
| bdp = pinfo->tx_cur; |
| |
| while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) { |
| count = 0; |
| p = cpm2cpu_addr(bdp->cbd_bufaddr); |
| while (count < pinfo->tx_fifosize) { |
| *p++ = xmit->buf[xmit->tail]; |
| xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| port->icount.tx++; |
| count++; |
| if (xmit->head == xmit->tail) |
| break; |
| } |
| bdp->cbd_datlen = count; |
| bdp->cbd_sc |= BD_SC_READY; |
| __asm__("eieio"); |
| /* Get next BD. */ |
| if (bdp->cbd_sc & BD_SC_WRAP) |
| bdp = pinfo->tx_bd_base; |
| else |
| bdp++; |
| } |
| pinfo->tx_cur = bdp; |
| |
| if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| uart_write_wakeup(port); |
| |
| if (uart_circ_empty(xmit)) { |
| cpm_uart_stop_tx(port); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* |
| * init buffer descriptors |
| */ |
| static void cpm_uart_initbd(struct uart_cpm_port *pinfo) |
| { |
| int i; |
| u8 *mem_addr; |
| volatile cbd_t *bdp; |
| |
| pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line); |
| |
| /* Set the physical address of the host memory |
| * buffers in the buffer descriptors, and the |
| * virtual address for us to work with. |
| */ |
| mem_addr = pinfo->mem_addr; |
| bdp = pinfo->rx_cur = pinfo->rx_bd_base; |
| for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) { |
| bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
| bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT; |
| mem_addr += pinfo->rx_fifosize; |
| } |
| |
| bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
| bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT; |
| |
| /* Set the physical address of the host memory |
| * buffers in the buffer descriptors, and the |
| * virtual address for us to work with. |
| */ |
| mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize); |
| bdp = pinfo->tx_cur = pinfo->tx_bd_base; |
| for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) { |
| bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
| bdp->cbd_sc = BD_SC_INTRPT; |
| mem_addr += pinfo->tx_fifosize; |
| } |
| |
| bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
| bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT; |
| } |
| |
| static void cpm_uart_init_scc(struct uart_cpm_port *pinfo) |
| { |
| int line = pinfo - cpm_uart_ports; |
| volatile scc_t *scp; |
| volatile scc_uart_t *sup; |
| |
| pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line); |
| |
| scp = pinfo->sccp; |
| sup = pinfo->sccup; |
| |
| /* Store address */ |
| pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE; |
| pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE; |
| |
| /* Set up the uart parameters in the |
| * parameter ram. |
| */ |
| |
| cpm_set_scc_fcr(sup); |
| |
| sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize; |
| sup->scc_maxidl = pinfo->rx_fifosize; |
| sup->scc_brkcr = 1; |
| sup->scc_parec = 0; |
| sup->scc_frmec = 0; |
| sup->scc_nosec = 0; |
| sup->scc_brkec = 0; |
| sup->scc_uaddr1 = 0; |
| sup->scc_uaddr2 = 0; |
| sup->scc_toseq = 0; |
| sup->scc_char1 = 0x8000; |
| sup->scc_char2 = 0x8000; |
| sup->scc_char3 = 0x8000; |
| sup->scc_char4 = 0x8000; |
| sup->scc_char5 = 0x8000; |
| sup->scc_char6 = 0x8000; |
| sup->scc_char7 = 0x8000; |
| sup->scc_char8 = 0x8000; |
| sup->scc_rccm = 0xc0ff; |
| |
| /* Send the CPM an initialize command. |
| */ |
| cpm_line_cr_cmd(line, CPM_CR_INIT_TRX); |
| |
| /* Set UART mode, 8 bit, no parity, one stop. |
| * Enable receive and transmit. |
| */ |
| scp->scc_gsmrh = 0; |
| scp->scc_gsmrl = |
| (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16); |
| |
| /* Enable rx interrupts and clear all pending events. */ |
| scp->scc_sccm = 0; |
| scp->scc_scce = 0xffff; |
| scp->scc_dsr = 0x7e7e; |
| scp->scc_psmr = 0x3000; |
| |
| scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| } |
| |
| static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) |
| { |
| int line = pinfo - cpm_uart_ports; |
| volatile smc_t *sp; |
| volatile smc_uart_t *up; |
| |
| pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line); |
| |
| sp = pinfo->smcp; |
| up = pinfo->smcup; |
| |
| /* Store address */ |
| pinfo->smcup->smc_rbase = (u_char *)pinfo->rx_bd_base - DPRAM_BASE; |
| pinfo->smcup->smc_tbase = (u_char *)pinfo->tx_bd_base - DPRAM_BASE; |
| |
| /* |
| * In case SMC1 is being relocated... |
| */ |
| #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH) |
| up->smc_rbptr = pinfo->smcup->smc_rbase; |
| up->smc_tbptr = pinfo->smcup->smc_tbase; |
| up->smc_rstate = 0; |
| up->smc_tstate = 0; |
| up->smc_brkcr = 1; /* number of break chars */ |
| up->smc_brkec = 0; |
| #endif |
| |
| /* Set up the uart parameters in the |
| * parameter ram. |
| */ |
| cpm_set_smc_fcr(up); |
| |
| /* Using idle charater time requires some additional tuning. */ |
| up->smc_mrblr = pinfo->rx_fifosize; |
| up->smc_maxidl = pinfo->rx_fifosize; |
| up->smc_brklen = 0; |
| up->smc_brkec = 0; |
| up->smc_brkcr = 1; |
| |
| cpm_line_cr_cmd(line, CPM_CR_INIT_TRX); |
| |
| /* Set UART mode, 8 bit, no parity, one stop. |
| * Enable receive and transmit. |
| */ |
| sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART; |
| |
| /* Enable only rx interrupts clear all pending events. */ |
| sp->smc_smcm = 0; |
| sp->smc_smce = 0xff; |
| |
| sp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN); |
| } |
| |
| /* |
| * Initialize port. This is called from early_console stuff |
| * so we have to be careful here ! |
| */ |
| static int cpm_uart_request_port(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| int ret; |
| |
| pr_debug("CPM uart[%d]:request port\n", port->line); |
| |
| if (pinfo->flags & FLAG_CONSOLE) |
| return 0; |
| |
| /* |
| * Setup any port IO, connect any baud rate generators, |
| * etc. This is expected to be handled by board |
| * dependant code |
| */ |
| if (pinfo->set_lineif) |
| pinfo->set_lineif(pinfo); |
| |
| if (IS_SMC(pinfo)) { |
| pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| } else { |
| pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| } |
| |
| ret = cpm_uart_allocbuf(pinfo, 0); |
| |
| if (ret) |
| return ret; |
| |
| cpm_uart_initbd(pinfo); |
| if (IS_SMC(pinfo)) |
| cpm_uart_init_smc(pinfo); |
| else |
| cpm_uart_init_scc(pinfo); |
| |
| return 0; |
| } |
| |
| static void cpm_uart_release_port(struct uart_port *port) |
| { |
| struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| |
| if (!(pinfo->flags & FLAG_CONSOLE)) |
| cpm_uart_freebuf(pinfo); |
| } |
| |
| /* |
| * Configure/autoconfigure the port. |
| */ |
| static void cpm_uart_config_port(struct uart_port *port, int flags) |
| { |
| pr_debug("CPM uart[%d]:config_port\n", port->line); |
| |
| if (flags & UART_CONFIG_TYPE) { |
| port->type = PORT_CPM; |
| cpm_uart_request_port(port); |
| } |
| } |
| static struct uart_ops cpm_uart_pops = { |
| .tx_empty = cpm_uart_tx_empty, |
| .set_mctrl = cpm_uart_set_mctrl, |
| .get_mctrl = cpm_uart_get_mctrl, |
| .stop_tx = cpm_uart_stop_tx, |
| .start_tx = cpm_uart_start_tx, |
| .stop_rx = cpm_uart_stop_rx, |
| .enable_ms = cpm_uart_enable_ms, |
| .break_ctl = cpm_uart_break_ctl, |
| .startup = cpm_uart_startup, |
| .shutdown = cpm_uart_shutdown, |
| .set_termios = cpm_uart_set_termios, |
| .type = cpm_uart_type, |
| .release_port = cpm_uart_release_port, |
| .request_port = cpm_uart_request_port, |
| .config_port = cpm_uart_config_port, |
| .verify_port = cpm_uart_verify_port, |
| }; |
| |
| struct uart_cpm_port cpm_uart_ports[UART_NR] = { |
| [UART_SMC1] = { |
| .port = { |
| .irq = SMC1_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .flags = FLAG_SMC, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = smc1_lineif, |
| }, |
| [UART_SMC2] = { |
| .port = { |
| .irq = SMC2_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .flags = FLAG_SMC, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = smc2_lineif, |
| #ifdef CONFIG_SERIAL_CPM_ALT_SMC2 |
| .is_portb = 1, |
| #endif |
| }, |
| [UART_SCC1] = { |
| .port = { |
| .irq = SCC1_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = scc1_lineif, |
| .wait_closing = SCC_WAIT_CLOSING, |
| }, |
| [UART_SCC2] = { |
| .port = { |
| .irq = SCC2_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = scc2_lineif, |
| .wait_closing = SCC_WAIT_CLOSING, |
| }, |
| [UART_SCC3] = { |
| .port = { |
| .irq = SCC3_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = scc3_lineif, |
| .wait_closing = SCC_WAIT_CLOSING, |
| }, |
| [UART_SCC4] = { |
| .port = { |
| .irq = SCC4_IRQ, |
| .ops = &cpm_uart_pops, |
| .iotype = SERIAL_IO_MEM, |
| .lock = SPIN_LOCK_UNLOCKED, |
| }, |
| .tx_nrfifos = TX_NUM_FIFO, |
| .tx_fifosize = TX_BUF_SIZE, |
| .rx_nrfifos = RX_NUM_FIFO, |
| .rx_fifosize = RX_BUF_SIZE, |
| .set_lineif = scc4_lineif, |
| .wait_closing = SCC_WAIT_CLOSING, |
| }, |
| }; |
| |
| #ifdef CONFIG_SERIAL_CPM_CONSOLE |
| /* |
| * Print a string to the serial port trying not to disturb |
| * any possible real use of the port... |
| * |
| * Note that this is called with interrupts already disabled |
| */ |
| static void cpm_uart_console_write(struct console *co, const char *s, |
| u_int count) |
| { |
| struct uart_cpm_port *pinfo = |
| &cpm_uart_ports[cpm_uart_port_map[co->index]]; |
| unsigned int i; |
| volatile cbd_t *bdp, *bdbase; |
| volatile unsigned char *cp; |
| |
| /* Get the address of the host memory buffer. |
| */ |
| bdp = pinfo->tx_cur; |
| bdbase = pinfo->tx_bd_base; |
| |
| /* |
| * Now, do each character. This is not as bad as it looks |
| * since this is a holding FIFO and not a transmitting FIFO. |
| * We could add the complexity of filling the entire transmit |
| * buffer, but we would just wait longer between accesses...... |
| */ |
| for (i = 0; i < count; i++, s++) { |
| /* Wait for transmitter fifo to empty. |
| * Ready indicates output is ready, and xmt is doing |
| * that, not that it is ready for us to send. |
| */ |
| while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| ; |
| |
| /* Send the character out. |
| * If the buffer address is in the CPM DPRAM, don't |
| * convert it. |
| */ |
| cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
| |
| *cp = *s; |
| |
| bdp->cbd_datlen = 1; |
| bdp->cbd_sc |= BD_SC_READY; |
| |
| if (bdp->cbd_sc & BD_SC_WRAP) |
| bdp = bdbase; |
| else |
| bdp++; |
| |
| /* if a LF, also do CR... */ |
| if (*s == 10) { |
| while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| ; |
| |
| cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
| |
| *cp = 13; |
| bdp->cbd_datlen = 1; |
| bdp->cbd_sc |= BD_SC_READY; |
| |
| if (bdp->cbd_sc & BD_SC_WRAP) |
| bdp = bdbase; |
| else |
| bdp++; |
| } |
| } |
| |
| /* |
| * Finally, Wait for transmitter & holding register to empty |
| * and restore the IER |
| */ |
| while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| ; |
| |
| pinfo->tx_cur = (volatile cbd_t *) bdp; |
| } |
| |
| /* |
| * Setup console. Be careful is called early ! |
| */ |
| static int __init cpm_uart_console_setup(struct console *co, char *options) |
| { |
| struct uart_port *port; |
| struct uart_cpm_port *pinfo; |
| int baud = 38400; |
| int bits = 8; |
| int parity = 'n'; |
| int flow = 'n'; |
| int ret; |
| |
| port = |
| (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]]; |
| pinfo = (struct uart_cpm_port *)port; |
| |
| pinfo->flags |= FLAG_CONSOLE; |
| |
| if (options) { |
| uart_parse_options(options, &baud, &parity, &bits, &flow); |
| } else { |
| bd_t *bd = (bd_t *) __res; |
| |
| if (bd->bi_baudrate) |
| baud = bd->bi_baudrate; |
| else |
| baud = 9600; |
| } |
| |
| /* |
| * Setup any port IO, connect any baud rate generators, |
| * etc. This is expected to be handled by board |
| * dependant code |
| */ |
| if (pinfo->set_lineif) |
| pinfo->set_lineif(pinfo); |
| |
| if (IS_SMC(pinfo)) { |
| pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| } else { |
| pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| } |
| |
| ret = cpm_uart_allocbuf(pinfo, 1); |
| |
| if (ret) |
| return ret; |
| |
| cpm_uart_initbd(pinfo); |
| |
| if (IS_SMC(pinfo)) |
| cpm_uart_init_smc(pinfo); |
| else |
| cpm_uart_init_scc(pinfo); |
| |
| uart_set_options(port, co, baud, parity, bits, flow); |
| |
| return 0; |
| } |
| |
| static struct uart_driver cpm_reg; |
| static struct console cpm_scc_uart_console = { |
| .name = "ttyCPM", |
| .write = cpm_uart_console_write, |
| .device = uart_console_device, |
| .setup = cpm_uart_console_setup, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| .data = &cpm_reg, |
| }; |
| |
| int __init cpm_uart_console_init(void) |
| { |
| int ret = cpm_uart_init_portdesc(); |
| |
| if (!ret) |
| register_console(&cpm_scc_uart_console); |
| return ret; |
| } |
| |
| console_initcall(cpm_uart_console_init); |
| |
| #define CPM_UART_CONSOLE &cpm_scc_uart_console |
| #else |
| #define CPM_UART_CONSOLE NULL |
| #endif |
| |
| static struct uart_driver cpm_reg = { |
| .owner = THIS_MODULE, |
| .driver_name = "ttyCPM", |
| .dev_name = "ttyCPM", |
| .major = SERIAL_CPM_MAJOR, |
| .minor = SERIAL_CPM_MINOR, |
| .cons = CPM_UART_CONSOLE, |
| }; |
| |
| static int __init cpm_uart_init(void) |
| { |
| int ret, i; |
| |
| printk(KERN_INFO "Serial: CPM driver $Revision: 0.01 $\n"); |
| |
| #ifndef CONFIG_SERIAL_CPM_CONSOLE |
| ret = cpm_uart_init_portdesc(); |
| if (ret) |
| return ret; |
| #endif |
| |
| cpm_reg.nr = cpm_uart_nr; |
| ret = uart_register_driver(&cpm_reg); |
| |
| if (ret) |
| return ret; |
| |
| for (i = 0; i < cpm_uart_nr; i++) { |
| int con = cpm_uart_port_map[i]; |
| cpm_uart_ports[con].port.line = i; |
| cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF; |
| uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port); |
| } |
| |
| return ret; |
| } |
| |
| static void __exit cpm_uart_exit(void) |
| { |
| int i; |
| |
| for (i = 0; i < cpm_uart_nr; i++) { |
| int con = cpm_uart_port_map[i]; |
| uart_remove_one_port(&cpm_reg, &cpm_uart_ports[con].port); |
| } |
| |
| uart_unregister_driver(&cpm_reg); |
| } |
| |
| module_init(cpm_uart_init); |
| module_exit(cpm_uart_exit); |
| |
| MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis"); |
| MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR); |