+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * ADM8668 serial driver, totally ripped the source from BCM63xx and changed
- * all the registers to fit our hardware, and removed all the features that
- * I didn't know because our GPL'd serial driver was way lame.
- *
- * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
- * Derived directly from bcm63xx_uart
- * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
- *
- */
-
-#if defined(CONFIG_SERIAL_ADM8668_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/console.h>
-#include <linux/clk.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/sysrq.h>
-#include <linux/serial.h>
-#include <linux/serial_core.h>
-#include <adm8668.h>
-
-#define ADM8668_NR_UARTS 1
-
-static struct uart_port ports[ADM8668_NR_UARTS];
-
-/*
- * handy uart register accessor
- */
-static inline unsigned int adm_uart_readl(struct uart_port *port,
- unsigned int offset)
-{
- return (*(volatile unsigned int *)(port->membase + offset));
-}
-
-static inline void adm_uart_writel(struct uart_port *port,
- unsigned int value, unsigned int offset)
-{
- (*((volatile unsigned int *)(port->membase + offset))) = value;
-}
-
-/*
- * serial core request to check if uart tx fifo is empty
- */
-static unsigned int adm_uart_tx_empty(struct uart_port *port)
-{
- /* we always wait for completion, no buffer is made... */
- return 1;
-}
-
-/*
- * serial core request to set RTS and DTR pin state and loopback mode
- */
-static void adm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-
-/*
- * serial core request to return RI, CTS, DCD and DSR pin state
- */
-static unsigned int adm_uart_get_mctrl(struct uart_port *port)
-{
- return 0;
-}
-
-/*
- * serial core request to disable tx ASAP (used for flow control)
- */
-static void adm_uart_stop_tx(struct uart_port *port)
-{
- unsigned int val;
-
- val = adm_uart_readl(port, UART_CR_REG);
- val &= ~(UART_TX_INT_EN);
- adm_uart_writel(port, val, UART_CR_REG);
-}
-
-/*
- * serial core request to (re)enable tx
- */
-static void adm_uart_start_tx(struct uart_port *port)
-{
- unsigned int val;
-
- val = adm_uart_readl(port, UART_CR_REG);
- val |= UART_TX_INT_EN;
- adm_uart_writel(port, val, UART_CR_REG);
-}
-
-/*
- * serial core request to stop rx, called before port shutdown
- */
-static void adm_uart_stop_rx(struct uart_port *port)
-{
- unsigned int val;
-
- val = adm_uart_readl(port, UART_CR_REG);
- val &= ~UART_RX_INT_EN;
- adm_uart_writel(port, val, UART_CR_REG);
-}
-
-/*
- * serial core request to enable modem status interrupt reporting
- */
-static void adm_uart_enable_ms(struct uart_port *port)
-{
-}
-
-/*
- * serial core request to start/stop emitting break char
- */
-static void adm_uart_break_ctl(struct uart_port *port, int ctl)
-{
-}
-
-/*
- * return port type in string format
- */
-static const char *adm_uart_type(struct uart_port *port)
-{
- return (port->type == PORT_ADM8668) ? "adm8668_uart" : NULL;
-}
-
-/*
- * read all chars in rx fifo and send them to core
- */
-static void adm_uart_do_rx(struct uart_port *port)
-{
- struct tty_struct *tty;
- unsigned int max_count;
-
- /* limit number of char read in interrupt, should not be
- * higher than fifo size anyway since we're much faster than
- * serial port */
- max_count = 32;
- tty = port->state->port.tty;
- do {
- unsigned int iestat, c, cstat;
- char flag;
-
- /* get overrun/fifo empty information from ier
- * register */
- iestat = adm_uart_readl(port, UART_FR_REG);
- if (iestat & UART_RX_FIFO_EMPTY)
- break;
-
- /* recieve status */
- cstat = adm_uart_readl(port, UART_RSR_REG);
- /* clear errors */
- adm_uart_writel(port, cstat, UART_RSR_REG);
-
- c = adm_uart_readl(port, UART_DR_REG);
- port->icount.rx++;
- flag = TTY_NORMAL;
-
- if (unlikely((cstat & UART_RX_STATUS_MASK))) {
- /* do stats first */
- if (cstat & UART_BREAK_ERR) {
- port->icount.brk++;
- if (uart_handle_break(port))
- continue;
- }
-
- if (cstat & UART_PARITY_ERR)
- port->icount.parity++;
- if (cstat & UART_FRAMING_ERR)
- port->icount.frame++;
- if (cstat & UART_OVERRUN_ERR) {
- port->icount.overrun++;
- tty_insert_flip_char(tty, 0, TTY_OVERRUN);
- }
-
- /* update flag wrt read_status_mask */
- cstat &= port->read_status_mask;
- if (cstat & UART_BREAK_ERR)
- flag = TTY_BREAK;
- if (cstat & UART_FRAMING_ERR)
- flag = TTY_FRAME;
- if (cstat & UART_PARITY_ERR)
- flag = TTY_PARITY;
- }
-
- if (uart_handle_sysrq_char(port, c))
- continue;
-
- /* fixthis */
- if ((cstat & port->ignore_status_mask) == 0)
- tty_insert_flip_char(tty, c, flag);
- } while (max_count--);
-
- tty_flip_buffer_push(tty);
-}
-
-/*
- * fill tx fifo with chars to send, stop when fifo is about to be full
- * or when all chars have been sent.
- */
-static void adm_uart_do_tx(struct uart_port *port)
-{
- struct circ_buf *xmit;
-
- if (port->x_char) {
- adm_uart_writel(port, port->x_char, UART_DR_REG);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_tx_stopped(port))
- adm_uart_stop_tx(port);
-
- xmit = &port->state->xmit;
-
- if (uart_circ_empty(xmit))
- goto txq_empty;
- do
- {
- while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
- ;
- adm_uart_writel(port, xmit->buf[xmit->tail], UART_DR_REG);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- goto txq_empty;
-
- return;
-
-txq_empty:
- adm_uart_stop_tx(port);
-}
-
-/*
- * process uart interrupt
- */
-static irqreturn_t adm_uart_interrupt(int irq, void *dev_id)
-{
- struct uart_port *port;
- unsigned int irqstat;
-
- port = dev_id;
- spin_lock(&port->lock);
-
- irqstat = adm_uart_readl(port, UART_IIR_REG);
-
- if (irqstat & (UART_RX_INT|UART_RX_TIMEOUT_INT)) {
- adm_uart_do_rx(port);
- }
-
- if (irqstat & UART_TX_INT) {
- adm_uart_do_tx(port);
- }
- spin_unlock(&port->lock);
- return IRQ_HANDLED;
-}
-
-/*
- * enable rx & tx operation on uart
- */
-static void adm_uart_enable(struct uart_port *port)
-{
- unsigned int val;
-
- val = adm_uart_readl(port, UART_CR_REG);
- // BREAK_INT too
- val |= (UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN);
- adm_uart_writel(port, val, UART_CR_REG);
-}
-
-/*
- * disable rx & tx operation on uart
- */
-static void adm_uart_disable(struct uart_port *port)
-{
- unsigned int val;
-
- val = adm_uart_readl(port, UART_CR_REG);
- val &= ~(UART_TX_INT_EN | UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN);
- adm_uart_writel(port, val, UART_CR_REG);
-}
-
-/*
- * clear all unread data in rx fifo and unsent data in tx fifo
- */
-static void adm_uart_flush(struct uart_port *port)
-{
- /* read any pending char to make sure all irq status are
- * cleared */
- (void)adm_uart_readl(port, UART_DR_REG);
-}
-
-/*
- * serial core request to initialize uart and start rx operation
- */
-static int adm_uart_startup(struct uart_port *port)
-{
- int ret;
-
- /* clear any pending external input interrupt */
- (void)adm_uart_readl(port, UART_IIR_REG);
-
- /* register irq and enable rx interrupts */
- ret = request_irq(port->irq, adm_uart_interrupt, 0,
- adm_uart_type(port), port);
- if (ret)
- return ret;
-
- adm_uart_enable(port);
-
- return 0;
-}
-
-/*
- * serial core request to flush & disable uart
- */
-static void adm_uart_shutdown(struct uart_port *port)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
-// adm_uart_writel(port, 0, UART_CR_REG);
- spin_unlock_irqrestore(&port->lock, flags);
-
- adm_uart_disable(port);
- adm_uart_flush(port);
- free_irq(port->irq, port);
-}
-
-/*
- * serial core request to change current uart setting
- */
-static void adm_uart_set_termios(struct uart_port *port,
- struct ktermios *new,
- struct ktermios *old)
-{
- port->ignore_status_mask = 0;
- uart_update_timeout(port, new->c_cflag, 115200);
-}
-
-/*
- * serial core request to claim uart iomem
- */
-static int adm_uart_request_port(struct uart_port *port)
-{
- unsigned int size = 0xf;
- if (!request_mem_region(port->mapbase, size, "adm8668")) {
- dev_err(port->dev, "Memory region busy\n");
- return -EBUSY;
- }
-
- port->membase = ioremap(port->mapbase, size);
- if (!port->membase) {
- dev_err(port->dev, "Unable to map registers\n");
- release_mem_region(port->mapbase, size);
- return -EBUSY;
- }
- return 0;
-}
-
-/*
- * serial core request to release uart iomem
- */
-static void adm_uart_release_port(struct uart_port *port)
-{
- release_mem_region(port->mapbase, 0xf);
- iounmap(port->membase);
-}
-
-/*
- * serial core request to do any port required autoconfiguration
- */
-static void adm_uart_config_port(struct uart_port *port, int flags)
-{
- if (flags & UART_CONFIG_TYPE) {
- if (adm_uart_request_port(port))
- return;
- port->type = PORT_ADM8668;
- }
-}
-
-/*
- * serial core request to check that port information in serinfo are
- * suitable
- */
-static int adm_uart_verify_port(struct uart_port *port,
- struct serial_struct *serinfo)
-{
- if (port->type != PORT_ADM8668)
- return -EINVAL;
- if (port->irq != serinfo->irq)
- return -EINVAL;
- if (port->iotype != serinfo->io_type)
- return -EINVAL;
- if (port->mapbase != (unsigned long)serinfo->iomem_base)
- return -EINVAL;
- return 0;
-}
-
-/* serial core callbacks */
-static struct uart_ops adm_uart_ops = {
- .tx_empty = adm_uart_tx_empty,
- .get_mctrl = adm_uart_get_mctrl,
- .set_mctrl = adm_uart_set_mctrl,
- .start_tx = adm_uart_start_tx,
- .stop_tx = adm_uart_stop_tx,
- .stop_rx = adm_uart_stop_rx,
- .enable_ms = adm_uart_enable_ms,
- .break_ctl = adm_uart_break_ctl,
- .startup = adm_uart_startup,
- .shutdown = adm_uart_shutdown,
- .set_termios = adm_uart_set_termios,
- .type = adm_uart_type,
- .release_port = adm_uart_release_port,
- .request_port = adm_uart_request_port,
- .config_port = adm_uart_config_port,
- .verify_port = adm_uart_verify_port,
-};
-
-#ifdef CONFIG_SERIAL_ADM8668_CONSOLE
-static inline void wait_for_xmitr(struct uart_port *port)
-{
- while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
- ;
-}
-
-/*
- * output given char
- */
-static void adm_console_putchar(struct uart_port *port, int ch)
-{
- wait_for_xmitr(port);
- adm_uart_writel(port, ch, UART_DR_REG);
-}
-
-/*
- * console core request to output given string
- */
-static void adm_console_write(struct console *co, const char *s,
- unsigned int count)
-{
- struct uart_port *port;
- unsigned long flags;
- int locked;
-
- port = &ports[co->index];
-
- local_irq_save(flags);
- if (port->sysrq) {
- /* adm_uart_interrupt() already took the lock */
- locked = 0;
- } else if (oops_in_progress) {
- locked = spin_trylock(&port->lock);
- } else {
- spin_lock(&port->lock);
- locked = 1;
- }
-
- /* call helper to deal with \r\n */
- uart_console_write(port, s, count, adm_console_putchar);
-
- /* and wait for char to be transmitted */
- wait_for_xmitr(port);
-
- if (locked)
- spin_unlock(&port->lock);
- local_irq_restore(flags);
-}
-
-/*
- * console core request to setup given console, find matching uart
- * port and setup it.
- */
-static int adm_console_setup(struct console *co, char *options)
-{
- struct uart_port *port;
- int baud = 115200;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- if (co->index < 0 || co->index >= ADM8668_NR_UARTS)
- return -EINVAL;
- port = &ports[co->index];
- if (!port->membase)
- return -ENODEV;
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
-
- return uart_set_options(port, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver adm_uart_driver;
-
-static struct console adm8668_console = {
- .name = "ttyS",
- .write = adm_console_write,
- .device = uart_console_device,
- .setup = adm_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &adm_uart_driver,
-};
-
-static int __init adm8668_console_init(void)
-{
- register_console(&adm8668_console);
- return 0;
-}
-
-console_initcall(adm8668_console_init);
-
-#define ADM8668_CONSOLE (&adm8668_console)
-#else
-#define ADM8668_CONSOLE NULL
-#endif /* CONFIG_SERIAL_ADM8668_CONSOLE */
-
-static struct uart_driver adm_uart_driver = {
- .owner = THIS_MODULE,
- .driver_name = "adm8668_uart",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 64,
- .nr = 1,
- .cons = ADM8668_CONSOLE,
-};
-
-/*
- * platform driver probe/remove callback
- */
-static int __devinit adm_uart_probe(struct platform_device *pdev)
-{
- struct resource *res_mem, *res_irq;
- struct uart_port *port;
- int ret;
-
- if (pdev->id < 0 || pdev->id >= ADM8668_NR_UARTS)
- return -EINVAL;
-
- if (ports[pdev->id].membase)
- return -EBUSY;
-
- res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res_mem)
- return -ENODEV;
-
- res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!res_irq)
- return -ENODEV;
-
- port = &ports[pdev->id];
- memset(port, 0, sizeof(*port));
- port->iotype = UPIO_MEM;
- port->mapbase = res_mem->start;
- port->irq = res_irq->start;
- port->ops = &adm_uart_ops;
- port->flags = UPF_BOOT_AUTOCONF;
- port->dev = &pdev->dev;
- port->fifosize = 8;
- port->uartclk = ADM8668_UARTCLK_FREQ;
-
- ret = uart_add_one_port(&adm_uart_driver, port);
- if (ret) {
- ports[pdev->id].membase = 0;
- return ret;
- }
- platform_set_drvdata(pdev, port);
- return 0;
-}
-
-static int __devexit adm_uart_remove(struct platform_device *pdev)
-{
- struct uart_port *port;
-
- port = platform_get_drvdata(pdev);
- uart_remove_one_port(&adm_uart_driver, port);
- platform_set_drvdata(pdev, NULL);
- /* mark port as free */
- ports[pdev->id].membase = 0;
- return 0;
-}
-
-/*
- * platform driver stuff
- */
-static struct platform_driver adm_uart_platform_driver = {
- .probe = adm_uart_probe,
- .remove = __devexit_p(adm_uart_remove),
- .driver = {
- .owner = THIS_MODULE,
- .name = "adm8668_uart",
- },
-};
-
-static int __init adm_uart_init(void)
-{
- int ret;
-
- ret = uart_register_driver(&adm_uart_driver);
- if (ret)
- return ret;
-
- ret = platform_driver_register(&adm_uart_platform_driver);
- if (ret)
- uart_unregister_driver(&adm_uart_driver);
-
- return ret;
-}
-
-static void __exit adm_uart_exit(void)
-{
- platform_driver_unregister(&adm_uart_platform_driver);
- uart_unregister_driver(&adm_uart_driver);
-}
-
-module_init(adm_uart_init);
-module_exit(adm_uart_exit);
-
-MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
-MODULE_DESCRIPTION("ADM8668 integrated uart driver");
-MODULE_LICENSE("GPL");
projects / openwrt.git / blobdiff