Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750942AbWIMPCz (ORCPT ); Wed, 13 Sep 2006 11:02:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750945AbWIMPCy (ORCPT ); Wed, 13 Sep 2006 11:02:54 -0400 Received: from lixom.net ([66.141.50.11]:38024 "EHLO mail.lixom.net") by vger.kernel.org with ESMTP id S1750942AbWIMPCx (ORCPT ); Wed, 13 Sep 2006 11:02:53 -0400 Date: Wed, 13 Sep 2006 10:01:10 -0500 From: Olof Johansson To: Peter Korsgaard Cc: rmk+serial@arm.linux.org.uk, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] Xilinx uartlite serial driver Message-ID: <20060913100110.1e33d885@localhost.localdomain> In-Reply-To: <871wqfyjgi.fsf@slug.be.48ers.dk> References: <87ac9o3ak3.fsf@sleipner.barco.com> <878xlgercm.fsf@slug.be.48ers.dk> <20060912093301.77f75bfb@localhost.localdomain> <87ejugxqbw.fsf@slug.be.48ers.dk> <871wqfyjgi.fsf@slug.be.48ers.dk> X-Mailer: Sylpheed-Claws 2.1.1 (GTK+ 2.8.17; powerpc-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 16905 Lines: 597 On Wed, 13 Sep 2006 15:39:09 +0200 Peter Korsgaard wrote: > >>>>> "Peter" == Peter Korsgaard writes: > > Olof> 2. There seems to be some timeout issues with tx_empty. > > Peter> Huh, that's odd - I haven't noticed that. I'll test it again and get > Peter> back to you. > > Ahh, found it - I didn't update the uart timeout in set_termios so it > used a very long timeout. Please give the updated patch a try. Looks good. Thanks. > Additional changes: > - Actually add the fixes I did in May on request of Russell > - Update for 2.6.18 (devfs and new IRQF defines) > - Removed the SERIAL_UARTLITE_NR_UARTS config option as we only have 4 > minors reserved with lanana anyway. > > Signed-off-by: Peter Korsgaard Acked-by: Olof Johansson > > diff -urpN linux-2.6.18-rc7.orig/drivers/serial/Kconfig linux-2.6.18-rc7/drivers/serial/Kconfig > --- linux-2.6.18-rc7.orig/drivers/serial/Kconfig 2006-09-13 15:01:24.000000000 +0200 > +++ linux-2.6.18-rc7/drivers/serial/Kconfig 2006-09-13 15:01:51.000000000 +0200 > @@ -511,6 +511,25 @@ config SERIAL_IMX_CONSOLE > your boot loader (lilo or loadlin) about how to pass options to the > kernel at boot time.) > > +config SERIAL_UARTLITE > + tristate "Xilinx uartlite serial port support" > + depends on PPC32 > + select SERIAL_CORE > + help > + Say Y here if you want to use the Xilinx uartlite serial controller. > + > + To compile this driver as a module, choose M here: the > + module will be called uartlite.ko. > + > +config SERIAL_UARTLITE_CONSOLE > + bool "Support for console on Xilinx uartlite serial port" > + depends on SERIAL_UARTLITE=y > + select SERIAL_CORE_CONSOLE > + help > + Say Y here if you wish to use a Xilinx uartlite as the system > + console (the system console is the device which receives all kernel > + messages and warnings and which allows logins in single user mode). > + > config SERIAL_SUNCORE > bool > depends on SPARC > diff -urpN linux-2.6.18-rc7.orig/drivers/serial/Makefile linux-2.6.18-rc7/drivers/serial/Makefile > --- linux-2.6.18-rc7.orig/drivers/serial/Makefile 2006-09-13 15:01:24.000000000 +0200 > +++ linux-2.6.18-rc7/drivers/serial/Makefile 2006-09-13 15:01:51.000000000 +0200 > @@ -55,4 +55,5 @@ obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_si > obj-$(CONFIG_SERIAL_SGI_IOC4) += ioc4_serial.o > obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o > obj-$(CONFIG_SERIAL_AT91) += at91_serial.o > +obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o > obj-$(CONFIG_SERIAL_NETX) += netx-serial.o > diff -urpN linux-2.6.18-rc7.orig/drivers/serial/uartlite.c linux-2.6.18-rc7/drivers/serial/uartlite.c > --- linux-2.6.18-rc7.orig/drivers/serial/uartlite.c 1970-01-01 01:00:00.000000000 +0100 > +++ linux-2.6.18-rc7/drivers/serial/uartlite.c 2006-09-13 15:01:51.000000000 +0200 > @@ -0,0 +1,496 @@ > +/* > + * uartlite.c: Serial driver for Xilinx uartlite serial controller > + * > + * Peter Korsgaard > + * > + * This file is licensed under the terms of the GNU General Public License > + * version 2. This program is licensed "as is" without any warranty of any > + * kind, whether express or implied. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define ULITE_MAJOR 204 > +#define ULITE_MINOR 187 > +#define ULITE_NR_UARTS 4 > + > +/* For register details see datasheet: > + http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf > +*/ > +#define ULITE_RX 0x00 > +#define ULITE_TX 0x04 > +#define ULITE_STATUS 0x08 > +#define ULITE_CONTROL 0x0c > + > +#define ULITE_REGION 16 > + > +#define ULITE_STATUS_RXVALID 0x01 > +#define ULITE_STATUS_RXFULL 0x02 > +#define ULITE_STATUS_TXEMPTY 0x04 > +#define ULITE_STATUS_TXFULL 0x08 > +#define ULITE_STATUS_IE 0x10 > +#define ULITE_STATUS_OVERRUN 0x20 > +#define ULITE_STATUS_FRAME 0x40 > +#define ULITE_STATUS_PARITY 0x80 > + > +#define ULITE_CONTROL_RST_TX 0x01 > +#define ULITE_CONTROL_RST_RX 0x02 > +#define ULITE_CONTROL_IE 0x10 > + > + > +static struct uart_port ports[ULITE_NR_UARTS]; > + > +static int ulite_receive(struct uart_port *port, int stat) > +{ > + struct tty_struct *tty = port->info->tty; > + unsigned char ch = 0; > + char flag = TTY_NORMAL; > + > + if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN > + | ULITE_STATUS_FRAME)) == 0) > + return 0; > + > + /* stats */ > + if (stat & ULITE_STATUS_RXVALID) { > + port->icount.rx++; > + ch = readb(port->membase + ULITE_RX); > + > + if (stat & ULITE_STATUS_PARITY) > + port->icount.parity++; > + } > + > + if (stat & ULITE_STATUS_OVERRUN) > + port->icount.overrun++; > + > + if (stat & ULITE_STATUS_FRAME) > + port->icount.frame++; > + > + > + /* drop byte with parity error if IGNPAR specificed */ > + if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY) > + stat &= ~ULITE_STATUS_RXVALID; > + > + stat &= port->read_status_mask; > + > + if (stat & ULITE_STATUS_PARITY) > + flag = TTY_PARITY; > + > + > + stat &= ~port->ignore_status_mask; > + > + if (stat & ULITE_STATUS_RXVALID) > + tty_insert_flip_char(tty, ch, flag); > + > + if (stat & ULITE_STATUS_FRAME) > + tty_insert_flip_char(tty, 0, TTY_FRAME); > + > + if (stat & ULITE_STATUS_OVERRUN) > + tty_insert_flip_char(tty, 0, TTY_OVERRUN); > + > + return 1; > +} > + > +static int ulite_transmit(struct uart_port *port, int stat) > +{ > + struct circ_buf *xmit = &port->info->xmit; > + > + if (stat & ULITE_STATUS_TXFULL) > + return 0; > + > + if (port->x_char) { > + writeb(port->x_char, port->membase + ULITE_TX); > + port->x_char = 0; > + port->icount.tx++; > + return 1; > + } > + > + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) > + return 0; > + > + writeb(xmit->buf[xmit->tail], port->membase + ULITE_TX); > + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1); > + port->icount.tx++; > + > + /* wake up */ > + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) > + uart_write_wakeup(port); > + > + return 1; > +} > + > +static irqreturn_t ulite_isr(int irq, void *dev_id, struct pt_regs *regs) > +{ > + struct uart_port *port = (struct uart_port *)dev_id; > + int busy; > + > + do { > + int stat = readb(port->membase + ULITE_STATUS); > + busy = ulite_receive(port, stat); > + busy |= ulite_transmit(port, stat); > + } while (busy); > + > + tty_flip_buffer_push(port->info->tty); > + > + return IRQ_HANDLED; > +} > + > +static unsigned int ulite_tx_empty(struct uart_port *port) > +{ > + unsigned long flags; > + unsigned int ret; > + > + spin_lock_irqsave(&port->lock, flags); > + ret = readb(port->membase + ULITE_STATUS); > + spin_unlock_irqrestore(&port->lock, flags); > + > + return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0; > +} > + > +static unsigned int ulite_get_mctrl(struct uart_port *port) > +{ > + return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; > +} > + > +static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl) > +{ > + /* N/A */ > +} > + > +static void ulite_stop_tx(struct uart_port *port) > +{ > + /* N/A */ > +} > + > +static void ulite_start_tx(struct uart_port *port) > +{ > + ulite_transmit(port, readb(port->membase + ULITE_STATUS)); > +} > + > +static void ulite_stop_rx(struct uart_port *port) > +{ > + /* don't forward any more data (like !CREAD) */ > + port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY > + | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; > +} > + > +static void ulite_enable_ms(struct uart_port *port) > +{ > + /* N/A */ > +} > + > +static void ulite_break_ctl(struct uart_port *port, int ctl) > +{ > + /* N/A */ > +} > + > +static int ulite_startup(struct uart_port *port) > +{ > + int ret; > + > + ret = request_irq(port->irq, ulite_isr, > + IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port); > + if (ret) > + return ret; > + > + writeb(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX, > + port->membase + ULITE_CONTROL); > + writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL); > + > + return 0; > +} > + > +static void ulite_shutdown(struct uart_port *port) > +{ > + writeb(0, port->membase + ULITE_CONTROL); > + free_irq(port->irq, port); > +} > + > +static void ulite_set_termios(struct uart_port *port, struct termios *termios, > + struct termios *old) > +{ > + unsigned long flags; > + unsigned int baud; > + > + spin_lock_irqsave(&port->lock, flags); > + > + port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN > + | ULITE_STATUS_TXFULL; > + > + if (termios->c_iflag & INPCK) > + port->read_status_mask |= > + ULITE_STATUS_PARITY | ULITE_STATUS_FRAME; > + > + port->ignore_status_mask = 0; > + if (termios->c_iflag & IGNPAR) > + port->ignore_status_mask |= ULITE_STATUS_PARITY > + | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; > + > + /* ignore all characters if CREAD is not set */ > + if ((termios->c_cflag & CREAD) == 0) > + port->ignore_status_mask |= > + ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY > + | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; > + > + /* update timeout */ > + baud = uart_get_baud_rate(port, termios, old, 0, 460800); > + uart_update_timeout(port, termios->c_cflag, baud); > + > + spin_unlock_irqrestore(&port->lock, flags); > +} > + > +static const char *ulite_type(struct uart_port *port) > +{ > + return port->type == PORT_UARTLITE ? "uartlite" : NULL; > +} > + > +static void ulite_release_port(struct uart_port *port) > +{ > + release_mem_region(port->mapbase, ULITE_REGION); > + iounmap(port->membase); > + port->membase = 0; > +} > + > +static int ulite_request_port(struct uart_port *port) > +{ > + if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) { > + dev_err(port->dev, "Memory region busy\n"); > + return -EBUSY; > + } > + > + port->membase = ioremap(port->mapbase, ULITE_REGION); > + if (!port->membase) { > + dev_err(port->dev, "Unable to map registers\n"); > + release_mem_region(port->mapbase, ULITE_REGION); > + return -EBUSY; > + } > + > + return 0; > +} > + > +static void ulite_config_port(struct uart_port *port, int flags) > +{ > + ulite_request_port(port); > + port->type = PORT_UARTLITE; > +} > + > +static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser) > +{ > + /* we don't want the core code to modify any port params */ > + return -EINVAL; > +} > + > +static struct uart_ops ulite_ops = { > + .tx_empty = ulite_tx_empty, > + .set_mctrl = ulite_set_mctrl, > + .get_mctrl = ulite_get_mctrl, > + .stop_tx = ulite_stop_tx, > + .start_tx = ulite_start_tx, > + .stop_rx = ulite_stop_rx, > + .enable_ms = ulite_enable_ms, > + .break_ctl = ulite_break_ctl, > + .startup = ulite_startup, > + .shutdown = ulite_shutdown, > + .set_termios = ulite_set_termios, > + .type = ulite_type, > + .release_port = ulite_release_port, > + .request_port = ulite_request_port, > + .config_port = ulite_config_port, > + .verify_port = ulite_verify_port > +}; > + > +#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE > +static void ulite_console_wait_tx(struct uart_port *port) > +{ > + int i; > + > + /* wait up to 10ms for the character(s) to be sent */ > + for (i=0; i<10000; i++) { > + if (readb(port->membase + ULITE_STATUS) & ULITE_STATUS_TXEMPTY) > + break; > + udelay(1); > + } > +} > + > +static void ulite_console_putchar(struct uart_port *port, int ch) > +{ > + ulite_console_wait_tx(port); > + writeb(ch, port->membase + ULITE_TX); > +} > + > +static void ulite_console_write(struct console *co, const char *s, > + unsigned int count) > +{ > + struct uart_port *port = &ports[co->index]; > + unsigned long flags; > + unsigned int ier; > + int locked = 1; > + > + if (oops_in_progress) { > + locked = spin_trylock_irqsave(&port->lock, flags); > + } else > + spin_lock_irqsave(&port->lock, flags); > + > + /* save and disable interrupt */ > + ier = readb(port->membase + ULITE_STATUS) & ULITE_STATUS_IE; > + writeb(0, port->membase + ULITE_CONTROL); > + > + uart_console_write(port, s, count, ulite_console_putchar); > + > + ulite_console_wait_tx(port); > + > + /* restore interrupt state */ > + if (ier) > + writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL); > + > + if (locked) > + spin_unlock_irqrestore(&port->lock, flags); > +} > + > +static int __init ulite_console_setup(struct console *co, char *options) > +{ > + struct uart_port *port; > + > + if (co->index < 0 || co->index >= ULITE_NR_UARTS) > + return -EINVAL; > + > + port = &ports[co->index]; > + > + /* not initialized yet? */ > + if (!port->membase) > + return -ENODEV; > + > + return 0; > +} > + > +static struct uart_driver ulite_uart_driver; > + > +static struct console ulite_console = { > + .name = "ttyUL", > + .write = ulite_console_write, > + .device = uart_console_device, > + .setup = ulite_console_setup, > + .flags = CON_PRINTBUFFER, > + .index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */ > + .data = &ulite_uart_driver, > +}; > + > +static int __init ulite_console_init(void) > +{ > + register_console(&ulite_console); > + return 0; > +} > + > +console_initcall(ulite_console_init); > + > +#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */ > + > +static struct uart_driver ulite_uart_driver = { > + .owner = THIS_MODULE, > + .driver_name = "uartlite", > + .dev_name = "ttyUL", > + .major = ULITE_MAJOR, > + .minor = ULITE_MINOR, > + .nr = ULITE_NR_UARTS, > +#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE > + .cons = &ulite_console, > +#endif > +}; > + > +static int __devinit ulite_probe(struct platform_device *pdev) > +{ > + struct resource *res, *res2; > + struct uart_port *port; > + > + if (pdev->id < 0 || pdev->id >= ULITE_NR_UARTS) > + return -EINVAL; > + > + if (ports[pdev->id].membase) > + return -EBUSY; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) > + return -ENODEV; > + > + res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); > + if (!res2) > + return -ENODEV; > + > + port = &ports[pdev->id]; > + > + port->fifosize = 16; > + port->regshift = 2; > + port->iotype = UPIO_MEM; > + port->iobase = 1; /* mark port in use */ > + port->mapbase = res->start; > + port->membase = 0; > + port->ops = &ulite_ops; > + port->irq = res2->start; > + port->flags = UPF_BOOT_AUTOCONF; > + port->dev = &pdev->dev; > + port->type = PORT_UNKNOWN; > + > + uart_add_one_port(&ulite_uart_driver, port); > + platform_set_drvdata(pdev, port); > + > + return 0; > +} > + > +static int ulite_remove(struct platform_device *pdev) > +{ > + struct uart_port *port = platform_get_drvdata(pdev); > + > + platform_set_drvdata(pdev, NULL); > + > + if (port) > + uart_remove_one_port(&ulite_uart_driver, port); > + > + /* mark port as free */ > + port->membase = 0; > + > + return 0; > +} > + > +static struct platform_driver ulite_platform_driver = { > + .probe = ulite_probe, > + .remove = ulite_remove, > + .driver = { > + .owner = THIS_MODULE, > + .name = "uartlite", > + }, > +}; > + > +int __init ulite_init(void) > +{ > + int ret; > + > + ret = uart_register_driver(&ulite_uart_driver); > + if (ret) > + return ret; > + > + ret = platform_driver_register(&ulite_platform_driver); > + if (ret) > + uart_unregister_driver(&ulite_uart_driver); > + > + return ret; > +} > + > +void __exit ulite_exit(void) > +{ > + platform_driver_unregister(&ulite_platform_driver); > + uart_unregister_driver(&ulite_uart_driver); > +} > + > +module_init(ulite_init); > +module_exit(ulite_exit); > + > +MODULE_AUTHOR("Peter Korsgaard "); > +MODULE_DESCRIPTION("Xilinx uartlite serial driver"); > +MODULE_LICENSE("GPL"); > diff -urpN linux-2.6.18-rc7.orig/include/linux/serial_core.h linux-2.6.18-rc7/include/linux/serial_core.h > --- linux-2.6.18-rc7.orig/include/linux/serial_core.h 2006-09-13 15:01:25.000000000 +0200 > +++ linux-2.6.18-rc7/include/linux/serial_core.h 2006-09-13 15:01:51.000000000 +0200 > @@ -132,6 +132,8 @@ > > #define PORT_S3C2412 73 > > +/* Xilinx uartlite */ > +#define PORT_UARTLITE 74 > > #ifdef __KERNEL__ > > diff -urpN linux-2.6.18-rc7.orig/MAINTAINERS linux-2.6.18-rc7/MAINTAINERS > --- linux-2.6.18-rc7.orig/MAINTAINERS 2006-09-13 15:01:20.000000000 +0200 > +++ linux-2.6.18-rc7/MAINTAINERS 2006-09-13 15:01:51.000000000 +0200 > @@ -3303,6 +3303,12 @@ W: http://oss.sgi.com/projects/xfs > T: git git://oss.sgi.com:8090/xfs/xfs-2.6 > S: Supported > > +XILINX UARTLITE SERIAL DRIVER > +P: Peter Korsgaard > +M: jacmet@sunsite.dk > +L: linux-serial@vger.kernel.org > +S: Maintained > + > X86 3-LEVEL PAGING (PAE) SUPPORT > P: Ingo Molnar > M: mingo@redhat.com > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/