/* * linux/drivers/serial/uart00.c * * Driver for UART00 serial ports * * Based on drivers/char/serial_amba.c, by ARM Limited & * Deep Blue Solutions Ltd. * Copyright 2001 Altera Corporation * * Update for 2.6.4 by Dirk Behme <dirk.behme@de.bosch.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 * * $Id: uart00.c,v 1.35 2002/07/28 10:03:28 rmk Exp $ * */ #include <linux/config.h> #if defined(CONFIG_SERIAL_UART00_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) #define SUPPORT_SYSRQ #endif #include <linux/module.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/console.h> #include <linux/sysrq.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/sizes.h> #include <asm/arch/excalibur.h> #define UART00_TYPE (volatile unsigned int*) #include <asm/arch/uart00.h> #include <asm/arch/int_ctrl00.h> #define UART_NR 2 #define SERIAL_UART00_NAME "ttyUA" #define SERIAL_UART00_MAJOR 204 #define SERIAL_UART00_MINOR 16 /* Temporary - will change in future */ #define SERIAL_UART00_NR UART_NR #define UART_PORT_SIZE 0x50 #define UART00_ISR_PASS_LIMIT 256 /* * Access macros for the UART00 UARTs */ #define UART_GET_INT_STATUS(p) inl(UART_ISR((p)->membase)) #define UART_PUT_IES(p, c) outl(c,UART_IES((p)->membase)) #define UART_GET_IES(p) inl(UART_IES((p)->membase)) #define UART_PUT_IEC(p, c) outl(c,UART_IEC((p)->membase)) #define UART_GET_IEC(p) inl(UART_IEC((p)->membase)) #define UART_PUT_CHAR(p, c) outl(c,UART_TD((p)->membase)) #define UART_GET_CHAR(p) inl(UART_RD((p)->membase)) #define UART_GET_RSR(p) inl(UART_RSR((p)->membase)) #define UART_GET_RDS(p) inl(UART_RDS((p)->membase)) #define UART_GET_MSR(p) inl(UART_MSR((p)->membase)) #define UART_GET_MCR(p) inl(UART_MCR((p)->membase)) #define UART_PUT_MCR(p, c) outl(c,UART_MCR((p)->membase)) #define UART_GET_MC(p) inl(UART_MC((p)->membase)) #define UART_PUT_MC(p, c) outl(c,UART_MC((p)->membase)) #define UART_GET_TSR(p) inl(UART_TSR((p)->membase)) #define UART_GET_DIV_HI(p) inl(UART_DIV_HI((p)->membase)) #define UART_PUT_DIV_HI(p,c) outl(c,UART_DIV_HI((p)->membase)) #define UART_GET_DIV_LO(p) inl(UART_DIV_LO((p)->membase)) #define UART_PUT_DIV_LO(p,c) outl(c,UART_DIV_LO((p)->membase)) #define UART_RX_DATA(s) ((s) & UART_RSR_RX_LEVEL_MSK) #define UART_TX_READY(s) (((s) & UART_TSR_TX_LEVEL_MSK) < 15) //#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART00_UARTFR_TMSK) == 0) static void uart00_stop_tx(struct uart_port *port) { UART_PUT_IEC(port, UART_IEC_TIE_MSK); } static void uart00_stop_rx(struct uart_port *port) { UART_PUT_IEC(port, UART_IEC_RE_MSK); } static void uart00_enable_ms(struct uart_port *port) { UART_PUT_IES(port, UART_IES_ME_MSK); } static void uart00_rx_chars(struct uart_port *port, struct pt_regs *regs) { struct tty_struct *tty = port->info->tty; unsigned int status, ch, rds, flg, ignored = 0; status = UART_GET_RSR(port); while (UART_RX_DATA(status)) { /* * We need to read rds before reading the * character from the fifo */ rds = UART_GET_RDS(port); ch = UART_GET_CHAR(port); port->icount.rx++; if (tty->flip.count >= TTY_FLIPBUF_SIZE) goto ignore_char; flg = TTY_NORMAL; /* * Note that the error handling code is * out of the main execution path */ if (rds & (UART_RDS_BI_MSK |UART_RDS_FE_MSK| UART_RDS_PE_MSK |UART_RDS_PE_MSK)) goto handle_error; if (uart_handle_sysrq_char(port, ch, regs)) goto ignore_char; error_return: tty_insert_flip_char(tty, ch, flg); ignore_char: status = UART_GET_RSR(port); } out: tty_flip_buffer_push(tty); return; handle_error: if (rds & UART_RDS_BI_MSK) { status &= ~(UART_RDS_FE_MSK | UART_RDS_PE_MSK); port->icount.brk++; if (uart_handle_break(port)) goto ignore_char; } else if (rds & UART_RDS_PE_MSK) port->icount.parity++; else if (rds & UART_RDS_FE_MSK) port->icount.frame++; if (rds & UART_RDS_OE_MSK) port->icount.overrun++; if (rds & port->ignore_status_mask) { if (++ignored > 100) goto out; goto ignore_char; } rds &= port->read_status_mask; if (rds & UART_RDS_BI_MSK) flg = TTY_BREAK; else if (rds & UART_RDS_PE_MSK) flg = TTY_PARITY; else if (rds & UART_RDS_FE_MSK) flg = TTY_FRAME; if (rds & UART_RDS_OE_MSK) { /* * CHECK: does overrun affect the current character? * ASSUMPTION: it does not. */ tty_insert_flip_char(tty, ch, flg); ch = 0; flg = TTY_OVERRUN; } #ifdef SUPPORT_SYSRQ port->sysrq = 0; #endif goto error_return; } static void uart00_tx_chars(struct uart_port *port) { struct circ_buf *xmit = &port->info->xmit; int count; if (port->x_char) { while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15) barrier(); UART_PUT_CHAR(port, port->x_char); port->icount.tx++; port->x_char = 0; return; } if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { uart00_stop_tx(port); return; } count = port->fifosize >> 1; do { while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15) barrier(); UART_PUT_CHAR(port, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; if (uart_circ_empty(xmit)) break; } while (--count > 0); if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); if (uart_circ_empty(xmit)) uart00_stop_tx(port); } static void uart00_start_tx(struct uart_port *port) { UART_PUT_IES(port, UART_IES_TIE_MSK); uart00_tx_chars(port); } static void uart00_modem_status(struct uart_port *port) { unsigned int status; status = UART_GET_MSR(port); if (!(status & (UART_MSR_DCTS_MSK | UART_MSR_DDSR_MSK | UART_MSR_TERI_MSK | UART_MSR_DDCD_MSK))) return; if (status & UART_MSR_DDCD_MSK) uart_handle_dcd_change(port, status & UART_MSR_DCD_MSK); if (status & UART_MSR_DDSR_MSK) port->icount.dsr++; if (status & UART_MSR_DCTS_MSK) uart_handle_cts_change(port, status & UART_MSR_CTS_MSK); wake_up_interruptible(&port->info->delta_msr_wait); } static irqreturn_t uart00_int(int irq, void *dev_id, struct pt_regs *regs) { struct uart_port *port = dev_id; unsigned int status, pass_counter = 0; status = UART_GET_INT_STATUS(port); do { if (status & UART_ISR_RI_MSK) uart00_rx_chars(port, regs); if (status & UART_ISR_MI_MSK) uart00_modem_status(port); if (status & (UART_ISR_TI_MSK | UART_ISR_TII_MSK)) uart00_tx_chars(port); if (pass_counter++ > UART00_ISR_PASS_LIMIT) break; status = UART_GET_INT_STATUS(port); } while (status); return IRQ_HANDLED; } static unsigned int uart00_tx_empty(struct uart_port *port) { return UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK? 0 : TIOCSER_TEMT; } static unsigned int uart00_get_mctrl(struct uart_port *port) { unsigned int result = 0; unsigned int status; status = UART_GET_MSR(port); if (status & UART_MSR_DCD_MSK) result |= TIOCM_CAR; if (status & UART_MSR_DSR_MSK) result |= TIOCM_DSR; if (status & UART_MSR_CTS_MSK) result |= TIOCM_CTS; if (status & UART_MSR_RI_MSK) result |= TIOCM_RI; return result; } static void uart00_set_mctrl_null(struct uart_port *port, unsigned int mctrl) { } static void uart00_break_ctl(struct uart_port *port, int break_state) { unsigned long flags; unsigned int mcr; spin_lock_irqsave(&port->lock, flags); mcr = UART_GET_MCR(port); if (break_state == -1) mcr |= UART_MCR_BR_MSK; else mcr &= ~UART_MCR_BR_MSK; UART_PUT_MCR(port, mcr); spin_unlock_irqrestore(&port->lock, flags); } static void uart00_set_termios(struct uart_port *port, struct termios *termios, struct termios *old) { unsigned int uart_mc, old_ies, baud, quot; unsigned long flags; /* * We don't support CREAD (yet) */ termios->c_cflag |= CREAD; /* * Ask the core to calculate the divisor for us. */ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); quot = uart_get_divisor(port, baud); /* byte size and parity */ switch (termios->c_cflag & CSIZE) { case CS5: uart_mc = UART_MC_CLS_CHARLEN_5; break; case CS6: uart_mc = UART_MC_CLS_CHARLEN_6; break; case CS7: uart_mc = UART_MC_CLS_CHARLEN_7; break; default: // CS8 uart_mc = UART_MC_CLS_CHARLEN_8; break; } if (termios->c_cflag & CSTOPB) uart_mc|= UART_MC_ST_TWO; if (termios->c_cflag & PARENB) { uart_mc |= UART_MC_PE_MSK; if (!(termios->c_cflag & PARODD)) uart_mc |= UART_MC_EP_MSK; } spin_lock_irqsave(&port->lock, flags); /* * Update the per-port timeout. */ uart_update_timeout(port, termios->c_cflag, baud); port->read_status_mask = UART_RDS_OE_MSK; if (termios->c_iflag & INPCK) port->read_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK; if (termios->c_iflag & (BRKINT | PARMRK)) port->read_status_mask |= UART_RDS_BI_MSK; /* * Characters to ignore */ port->ignore_status_mask = 0; if (termios->c_iflag & IGNPAR) port->ignore_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK; if (termios->c_iflag & IGNBRK) { port->ignore_status_mask |= UART_RDS_BI_MSK; /* * If we're ignoring parity and break indicators, * ignore overruns to (for real raw support). */ if (termios->c_iflag & IGNPAR) port->ignore_status_mask |= UART_RDS_OE_MSK; } /* first, disable everything */ old_ies = UART_GET_IES(port); if (UART_ENABLE_MS(port, termios->c_cflag)) old_ies |= UART_IES_ME_MSK; /* Set baud rate */ UART_PUT_DIV_LO(port, (quot & 0xff)); UART_PUT_DIV_HI(port, ((quot & 0xf00) >> 8)); UART_PUT_MC(port, uart_mc); UART_PUT_IES(port, old_ies); spin_unlock_irqrestore(&port->lock, flags); } static int uart00_startup(struct uart_port *port) { int result; /* * Allocate the IRQ */ result = request_irq(port->irq, uart00_int, 0, "uart00", port); if (result) { printk(KERN_ERR "Request of irq %d failed\n", port->irq); return result; } /* * Finally, enable interrupts. Use the TII interrupt to minimise * the number of interrupts generated. If higher performance is * needed, consider using the TI interrupt with a suitable FIFO * threshold */ UART_PUT_IES(port, UART_IES_RE_MSK | UART_IES_TIE_MSK); return 0; } static void uart00_shutdown(struct uart_port *port) { /* * disable all interrupts, disable the port */ UART_PUT_IEC(port, 0xff); /* disable break condition and fifos */ UART_PUT_MCR(port, UART_GET_MCR(port) &~UART_MCR_BR_MSK); /* * Free the interrupt */ free_irq(port->irq, port); } static const char *uart00_type(struct uart_port *port) { return port->type == PORT_UART00 ? "Altera UART00" : NULL; } /* * Release the memory region(s) being used by 'port' */ static void uart00_release_port(struct uart_port *port) { release_mem_region(port->mapbase, UART_PORT_SIZE); #ifdef CONFIG_ARCH_CAMELOT if (port->membase != (void*)IO_ADDRESS(EXC_UART00_BASE)) { iounmap(port->membase); } #endif } /* * Request the memory region(s) being used by 'port' */ static int uart00_request_port(struct uart_port *port) { return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_uart00") != NULL ? 0 : -EBUSY; } /* * Configure/autoconfigure the port. */ static void uart00_config_port(struct uart_port *port, int flags) { /* * Map the io memory if this is a soft uart */ if (!port->membase) port->membase = ioremap_nocache(port->mapbase,SZ_4K); if (!port->membase) printk(KERN_ERR "serial00: cannot map io memory\n"); else port->type = PORT_UART00; } /* * verify the new serial_struct (for TIOCSSERIAL). */ static int uart00_verify_port(struct uart_port *port, struct serial_struct *ser) { int ret = 0; if (ser->type != PORT_UNKNOWN && ser->type != PORT_UART00) ret = -EINVAL; if (ser->irq < 0 || ser->irq >= NR_IRQS) ret = -EINVAL; if (ser->baud_base < 9600) ret = -EINVAL; return ret; } static struct uart_ops uart00_pops = { .tx_empty = uart00_tx_empty, .set_mctrl = uart00_set_mctrl_null, .get_mctrl = uart00_get_mctrl, .stop_tx = uart00_stop_tx, .start_tx = uart00_start_tx, .stop_rx = uart00_stop_rx, .enable_ms = uart00_enable_ms, .break_ctl = uart00_break_ctl, .startup = uart00_startup, .shutdown = uart00_shutdown, .set_termios = uart00_set_termios, .type = uart00_type, .release_port = uart00_release_port, .request_port = uart00_request_port, .config_port = uart00_config_port, .verify_port = uart00_verify_port, }; #ifdef CONFIG_ARCH_CAMELOT static struct uart_port epxa10db_port = { .membase = (void*)IO_ADDRESS(EXC_UART00_BASE), .mapbase = EXC_UART00_BASE, .iotype = SERIAL_IO_MEM, .irq = IRQ_UART, .uartclk = EXC_AHB2_CLK_FREQUENCY, .fifosize = 16, .ops = &uart00_pops, .flags = ASYNC_BOOT_AUTOCONF, }; #endif #ifdef CONFIG_SERIAL_UART00_CONSOLE static void uart00_console_write(struct console *co, const char *s, unsigned count) { #ifdef CONFIG_ARCH_CAMELOT struct uart_port *port = &epxa10db_port; unsigned int status, old_ies; int i; /* * First save the CR then disable the interrupts */ old_ies = UART_GET_IES(port); UART_PUT_IEC(port,0xff); /* * Now, do each character */ for (i = 0; i < count; i++) { do { status = UART_GET_TSR(port); } while (!UART_TX_READY(status)); UART_PUT_CHAR(port, s[i]); if (s[i] == '\n') { do { status = UART_GET_TSR(port); } while (!UART_TX_READY(status)); UART_PUT_CHAR(port, '\r'); } } /* * Finally, wait for transmitter to become empty * and restore the IES */ do { status = UART_GET_TSR(port); } while (status & UART_TSR_TX_LEVEL_MSK); UART_PUT_IES(port, old_ies); #endif } static void __init uart00_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) { unsigned int uart_mc, quot; uart_mc = UART_GET_MC(port); *parity = 'n'; if (uart_mc & UART_MC_PE_MSK) { if (uart_mc & UART_MC_EP_MSK) *parity = 'e'; else *parity = 'o'; } switch (uart_mc & UART_MC_CLS_MSK) { case UART_MC_CLS_CHARLEN_5: *bits = 5; break; case UART_MC_CLS_CHARLEN_6: *bits = 6; break; case UART_MC_CLS_CHARLEN_7: *bits = 7; break; case UART_MC_CLS_CHARLEN_8: *bits = 8; break; } quot = UART_GET_DIV_LO(port) | (UART_GET_DIV_HI(port) << 8); *baud = port->uartclk / (16 *quot ); } static int __init uart00_console_setup(struct console *co, char *options) { struct uart_port *port; int baud = 115200; int bits = 8; int parity = 'n'; int flow = 'n'; #ifdef CONFIG_ARCH_CAMELOT port = &epxa10db_port; ; #else return -ENODEV; #endif if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else uart00_console_get_options(port, &baud, &parity, &bits); return uart_set_options(port, co, baud, parity, bits, flow); } extern struct uart_driver uart00_reg; static struct console uart00_console = { .name = SERIAL_UART00_NAME, .write = uart00_console_write, .device = uart_console_device, .setup = uart00_console_setup, .flags = CON_PRINTBUFFER, .index = 0, .data = &uart00_reg, }; static int __init uart00_console_init(void) { register_console(&uart00_console); return 0; } console_initcall(uart00_console_init); #define UART00_CONSOLE &uart00_console #else #define UART00_CONSOLE NULL #endif static struct uart_driver uart00_reg = { .owner = NULL, .driver_name = SERIAL_UART00_NAME, .dev_name = SERIAL_UART00_NAME, .major = SERIAL_UART00_MAJOR, .minor = SERIAL_UART00_MINOR, .nr = UART_NR, .cons = UART00_CONSOLE, }; struct dev_port_entry{ unsigned int base_addr; struct uart_port *port; }; #ifdef CONFIG_PLD_HOTSWAP static struct dev_port_entry dev_port_map[UART_NR]; /* * Keep a mapping of dev_info addresses -> port lines to use when * removing ports dev==NULL indicates unused entry */ struct uart00_ps_data{ unsigned int clk; unsigned int fifosize; }; int uart00_add_device(struct pldhs_dev_info* dev_info, void* dev_ps_data) { struct uart00_ps_data* dev_ps=dev_ps_data; struct uart_port * port; int i,result; i=0; while(dev_port_map[i].port) i++; if(i==UART_NR){ printk(KERN_WARNING "uart00: Maximum number of ports reached\n"); return 0; } port=kmalloc(sizeof(struct uart_port),GFP_KERNEL); if(!port) return -ENOMEM; printk("clk=%d fifo=%d\n",dev_ps->clk,dev_ps->fifosize); port->membase=0; port->mapbase=dev_info->base_addr; port->iotype=SERIAL_IO_MEM; port->irq=dev_info->irq; port->uartclk=dev_ps->clk; port->fifosize=dev_ps->fifosize; port->ops=&uart00_pops; port->line=i; port->flags=ASYNC_BOOT_AUTOCONF; result=uart_add_one_port(&uart00_reg, port); if(result){ printk("uart_add_one_port returned %d\n",result); return result; } dev_port_map[i].base_addr=dev_info->base_addr; dev_port_map[i].port=port; printk("uart00: added device at %x as ttyUA%d\n",dev_port_map[i].base_addr,i); return 0; } int uart00_remove_devices(void) { int i,result; result=0; for(i=1;i<UART_NR;i++){ if(dev_port_map[i].base_addr){ result=uart_remove_one_port(&uart00_reg, dev_port_map[i].port); if(result) return result; /* port removed sucessfully, so now tidy up */ kfree(dev_port_map[i].port); dev_port_map[i].base_addr=0; dev_port_map[i].port=NULL; } } return 0; } struct pld_hotswap_ops uart00_pldhs_ops={ .name = "uart00", .add_device = uart00_add_device, .remove_devices = uart00_remove_devices, }; #endif static int __init uart00_init(void) { int result; printk(KERN_INFO "Serial: UART00 driver $Revision: 1.35 $\n"); printk(KERN_WARNING "serial_uart00:Using temporary major/minor pairs" " - these WILL change in the future\n"); result = uart_register_driver(&uart00_reg); if (result) return result; #ifdef CONFIG_ARCH_CAMELOT result = uart_add_one_port(&uart00_reg,&epxa10db_port); #endif if (result) uart_unregister_driver(&uart00_reg); #ifdef CONFIG_PLD_HOTSWAP pldhs_register_driver(&uart00_pldhs_ops); #endif return result; } __initcall(uart00_init);