/* * 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) 2005-2006 MontaVista Software, Inc. * Vitaly Bordug * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) #define SUPPORT_SYSRQ #endif #include #include #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 = 0; /**************************************************************/ 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); /**************************************************************/ /* Place-holder for board-specific stuff */ struct platform_device* __attribute__ ((weak)) __init early_uart_get_pdev(int index) { return NULL; } static void cpm_uart_count(void) { cpm_uart_nr = 0; #ifdef CONFIG_SERIAL_CPM_SMC1 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1; #endif #ifdef CONFIG_SERIAL_CPM_SMC2 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2; #endif #ifdef CONFIG_SERIAL_CPM_SCC1 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1; #endif #ifdef CONFIG_SERIAL_CPM_SCC2 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2; #endif #ifdef CONFIG_SERIAL_CPM_SCC3 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3; #endif #ifdef CONFIG_SERIAL_CPM_SCC4 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4; #endif } /* Get UART number by its id */ static int cpm_uart_id2nr(int id) { int i; if (id < UART_NR) { for (i=0; itx_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) { 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) { 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_buffer_request_room(tty, i) < i) { printk(KERN_WARNING "No room in flip buffer\n"); return; } /* get pointer */ cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo); /* 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)) continue; error_return: tty_insert_flip_char(tty, ch, flg); } /* 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) { 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); if (events & SMCM_TX) cpm_uart_int_tx(port); } 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); if (events & UART_SCCM_TX) cpm_uart_int_tx(port); } 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 */ if (IS_SMC(pinfo)) cpm_line_cr_cmd(line, CPM_CR_STOP_TX); else cpm_line_cr_cmd(line, CPM_CR_GRA_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, pinfo); *p++ = port->x_char; 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, pinfo); 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, pinfo); bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT; mem_addr += pinfo->rx_fifosize; } bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo); 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, pinfo); bdp->cbd_sc = BD_SC_INTRPT; mem_addr += pinfo->tx_fifosize; } bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo); 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; 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 = UPIO_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 = UPIO_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 = UPIO_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 = UPIO_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 = UPIO_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 = UPIO_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, }, }; int cpm_uart_drv_get_platform_data(struct platform_device *pdev, int is_con) { struct resource *r; struct fs_uart_platform_info *pdata = pdev->dev.platform_data; int idx; /* It is UART_SMCx or UART_SCCx index */ struct uart_cpm_port *pinfo; int line; u32 mem, pram; idx = pdata->fs_no = fs_uart_get_id(pdata); line = cpm_uart_id2nr(idx); if(line < 0) { printk(KERN_ERR"%s(): port %d is not registered", __FUNCTION__, idx); return -EINVAL; } pinfo = (struct uart_cpm_port *) &cpm_uart_ports[idx]; pinfo->brg = pdata->brg; if (!is_con) { pinfo->port.line = line; pinfo->port.flags = UPF_BOOT_AUTOCONF; } if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"))) return -EINVAL; mem = (u32)ioremap(r->start, r->end - r->start + 1); if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram"))) return -EINVAL; pram = (u32)ioremap(r->start, r->end - r->start + 1); if(idx > fsid_smc2_uart) { pinfo->sccp = (scc_t *)mem; pinfo->sccup = (scc_uart_t *)pram; } else { pinfo->smcp = (smc_t *)mem; pinfo->smcup = (smc_uart_t *)pram; } pinfo->tx_nrfifos = pdata->tx_num_fifo; pinfo->tx_fifosize = pdata->tx_buf_size; pinfo->rx_nrfifos = pdata->rx_num_fifo; pinfo->rx_fifosize = pdata->rx_buf_size; pinfo->port.uartclk = pdata->uart_clk; pinfo->port.mapbase = (unsigned long)mem; pinfo->port.irq = platform_get_irq(pdev, 0); return 0; } #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, pinfo); *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, pinfo); *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; } 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; struct fs_uart_platform_info *pdata; struct platform_device* pdev = early_uart_get_pdev(co->index); if (!pdev) { pr_info("cpm_uart: console: compat mode\n"); /* compatibility - will be cleaned up */ cpm_uart_init_portdesc(); } port = (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]]; pinfo = (struct uart_cpm_port *)port; if (!pdev) { if (pinfo->set_lineif) pinfo->set_lineif(pinfo); } else { pdata = pdev->dev.platform_data; if (pdata) if (pdata->init_ioports) pdata->init_ioports(pdata); cpm_uart_drv_get_platform_data(pdev, 1); } pinfo->flags |= FLAG_CONSOLE; if (options) { uart_parse_options(options, &baud, &parity, &bits, &flow); } else { if ((baud = uart_baudrate()) == -1) baud = 9600; } 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) { register_console(&cpm_scc_uart_console); return 0; } 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 cpm_uart_drv_probe(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct fs_uart_platform_info *pdata; int ret = -ENODEV; if(!pdev) { printk(KERN_ERR"CPM UART: platform data missing!\n"); return ret; } pdata = pdev->dev.platform_data; if ((ret = cpm_uart_drv_get_platform_data(pdev, 0))) return ret; pr_debug("cpm_uart_drv_probe: Adding CPM UART %d\n", cpm_uart_id2nr(pdata->fs_no)); if (pdata->init_ioports) pdata->init_ioports(pdata); ret = uart_add_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port); return ret; } static int cpm_uart_drv_remove(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct fs_uart_platform_info *pdata = pdev->dev.platform_data; pr_debug("cpm_uart_drv_remove: Removing CPM UART %d\n", cpm_uart_id2nr(pdata->fs_no)); uart_remove_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port); return 0; } static struct device_driver cpm_smc_uart_driver = { .name = "fsl-cpm-smc:uart", .bus = &platform_bus_type, .probe = cpm_uart_drv_probe, .remove = cpm_uart_drv_remove, }; static struct device_driver cpm_scc_uart_driver = { .name = "fsl-cpm-scc:uart", .bus = &platform_bus_type, .probe = cpm_uart_drv_probe, .remove = cpm_uart_drv_remove, }; /* This is supposed to match uart devices on platform bus, */ static int match_is_uart (struct device* dev, void* data) { struct platform_device* pdev = container_of(dev, struct platform_device, dev); int ret = 0; /* this was setfunc as uart */ if(strstr(pdev->name,":uart")) { ret = 1; } return ret; } static int cpm_uart_init(void) { int ret; int i; struct device *dev; printk(KERN_INFO "Serial: CPM driver $Revision: 0.02 $\n"); /* lookup the bus for uart devices */ dev = bus_find_device(&platform_bus_type, NULL, 0, match_is_uart); /* There are devices on the bus - all should be OK */ if (dev) { cpm_uart_count(); cpm_reg.nr = cpm_uart_nr; if (!(ret = uart_register_driver(&cpm_reg))) { if ((ret = driver_register(&cpm_smc_uart_driver))) { uart_unregister_driver(&cpm_reg); return ret; } if ((ret = driver_register(&cpm_scc_uart_driver))) { driver_unregister(&cpm_scc_uart_driver); uart_unregister_driver(&cpm_reg); } } } else { /* No capable platform devices found - falling back to legacy mode */ pr_info("cpm_uart: WARNING: no UART devices found on platform bus!\n"); pr_info( "cpm_uart: the driver will guess configuration, but this mode is no longer supported.\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) { driver_unregister(&cpm_scc_uart_driver); driver_unregister(&cpm_smc_uart_driver); 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);