diff options
Diffstat (limited to 'drivers/serial/apbuart.c')
| -rw-r--r-- | drivers/serial/apbuart.c | 709 |
1 files changed, 0 insertions, 709 deletions
diff --git a/drivers/serial/apbuart.c b/drivers/serial/apbuart.c deleted file mode 100644 index 095a5d562618..000000000000 --- a/drivers/serial/apbuart.c +++ /dev/null @@ -1,709 +0,0 @@ -/* - * Driver for GRLIB serial ports (APBUART) - * - * Based on linux/drivers/serial/amba.c - * - * Copyright (C) 2000 Deep Blue Solutions Ltd. - * Copyright (C) 2003 Konrad Eisele <eiselekd@web.de> - * Copyright (C) 2006 Daniel Hellstrom <daniel@gaisler.com>, Aeroflex Gaisler AB - * Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com> - * Copyright (C) 2009 Kristoffer Glembo <kristoffer@gaisler.com>, Aeroflex Gaisler AB - */ - -#if defined(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#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/kthread.h> -#include <linux/device.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/of_platform.h> -#include <linux/of_irq.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/serial_core.h> -#include <asm/irq.h> - -#include "apbuart.h" - -#define SERIAL_APBUART_MAJOR TTY_MAJOR -#define SERIAL_APBUART_MINOR 64 -#define UART_DUMMY_RSR_RX 0x8000 /* for ignore all read */ - -static void apbuart_tx_chars(struct uart_port *port); - -static void apbuart_stop_tx(struct uart_port *port) -{ - unsigned int cr; - - cr = UART_GET_CTRL(port); - cr &= ~UART_CTRL_TI; - UART_PUT_CTRL(port, cr); -} - -static void apbuart_start_tx(struct uart_port *port) -{ - unsigned int cr; - - cr = UART_GET_CTRL(port); - cr |= UART_CTRL_TI; - UART_PUT_CTRL(port, cr); - - if (UART_GET_STATUS(port) & UART_STATUS_THE) - apbuart_tx_chars(port); -} - -static void apbuart_stop_rx(struct uart_port *port) -{ - unsigned int cr; - - cr = UART_GET_CTRL(port); - cr &= ~(UART_CTRL_RI); - UART_PUT_CTRL(port, cr); -} - -static void apbuart_enable_ms(struct uart_port *port) -{ - /* No modem status change interrupts for APBUART */ -} - -static void apbuart_rx_chars(struct uart_port *port) -{ - struct tty_struct *tty = port->state->port.tty; - unsigned int status, ch, rsr, flag; - unsigned int max_chars = port->fifosize; - - status = UART_GET_STATUS(port); - - while (UART_RX_DATA(status) && (max_chars--)) { - - ch = UART_GET_CHAR(port); - flag = TTY_NORMAL; - - port->icount.rx++; - - rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX; - UART_PUT_STATUS(port, 0); - if (rsr & UART_STATUS_ERR) { - - if (rsr & UART_STATUS_BR) { - rsr &= ~(UART_STATUS_FE | UART_STATUS_PE); - port->icount.brk++; - if (uart_handle_break(port)) - goto ignore_char; - } else if (rsr & UART_STATUS_PE) { - port->icount.parity++; - } else if (rsr & UART_STATUS_FE) { - port->icount.frame++; - } - if (rsr & UART_STATUS_OE) - port->icount.overrun++; - - rsr &= port->read_status_mask; - - if (rsr & UART_STATUS_PE) - flag = TTY_PARITY; - else if (rsr & UART_STATUS_FE) - flag = TTY_FRAME; - } - - if (uart_handle_sysrq_char(port, ch)) - goto ignore_char; - - uart_insert_char(port, rsr, UART_STATUS_OE, ch, flag); - - - ignore_char: - status = UART_GET_STATUS(port); - } - - tty_flip_buffer_push(tty); -} - -static void apbuart_tx_chars(struct uart_port *port) -{ - struct circ_buf *xmit = &port->state->xmit; - int count; - - if (port->x_char) { - UART_PUT_CHAR(port, port->x_char); - port->icount.tx++; - port->x_char = 0; - return; - } - - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - apbuart_stop_tx(port); - return; - } - - /* amba: fill FIFO */ - count = port->fifosize >> 1; - do { - 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)) - apbuart_stop_tx(port); -} - -static irqreturn_t apbuart_int(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - unsigned int status; - - spin_lock(&port->lock); - - status = UART_GET_STATUS(port); - if (status & UART_STATUS_DR) - apbuart_rx_chars(port); - if (status & UART_STATUS_THE) - apbuart_tx_chars(port); - - spin_unlock(&port->lock); - - return IRQ_HANDLED; -} - -static unsigned int apbuart_tx_empty(struct uart_port *port) -{ - unsigned int status = UART_GET_STATUS(port); - return status & UART_STATUS_THE ? TIOCSER_TEMT : 0; -} - -static unsigned int apbuart_get_mctrl(struct uart_port *port) -{ - /* The GRLIB APBUART handles flow control in hardware */ - return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; -} - -static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - /* The GRLIB APBUART handles flow control in hardware */ -} - -static void apbuart_break_ctl(struct uart_port *port, int break_state) -{ - /* We don't support sending break */ -} - -static int apbuart_startup(struct uart_port *port) -{ - int retval; - unsigned int cr; - - /* Allocate the IRQ */ - retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port); - if (retval) - return retval; - - /* Finally, enable interrupts */ - cr = UART_GET_CTRL(port); - UART_PUT_CTRL(port, - cr | UART_CTRL_RE | UART_CTRL_TE | - UART_CTRL_RI | UART_CTRL_TI); - - return 0; -} - -static void apbuart_shutdown(struct uart_port *port) -{ - unsigned int cr; - - /* disable all interrupts, disable the port */ - cr = UART_GET_CTRL(port); - UART_PUT_CTRL(port, - cr & ~(UART_CTRL_RE | UART_CTRL_TE | - UART_CTRL_RI | UART_CTRL_TI)); - - /* Free the interrupt */ - free_irq(port->irq, port); -} - -static void apbuart_set_termios(struct uart_port *port, - struct ktermios *termios, struct ktermios *old) -{ - unsigned int cr; - unsigned long flags; - unsigned int baud, quot; - - /* Ask the core to calculate the divisor for us. */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); - if (baud == 0) - panic("invalid baudrate %i\n", port->uartclk / 16); - - /* uart_get_divisor calc a *16 uart freq, apbuart is *8 */ - quot = (uart_get_divisor(port, baud)) * 2; - cr = UART_GET_CTRL(port); - cr &= ~(UART_CTRL_PE | UART_CTRL_PS); - - if (termios->c_cflag & PARENB) { - cr |= UART_CTRL_PE; - if ((termios->c_cflag & PARODD)) - cr |= UART_CTRL_PS; - } - - /* Enable flow control. */ - if (termios->c_cflag & CRTSCTS) - cr |= UART_CTRL_FL; - - spin_lock_irqsave(&port->lock, flags); - - /* Update the per-port timeout. */ - uart_update_timeout(port, termios->c_cflag, baud); - - port->read_status_mask = UART_STATUS_OE; - if (termios->c_iflag & INPCK) - port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE; - - /* Characters to ignore */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE; - - /* Ignore all characters if CREAD is not set. */ - if ((termios->c_cflag & CREAD) == 0) - port->ignore_status_mask |= UART_DUMMY_RSR_RX; - - /* Set baud rate */ - quot -= 1; - UART_PUT_SCAL(port, quot); - UART_PUT_CTRL(port, cr); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static const char *apbuart_type(struct uart_port *port) -{ - return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL; -} - -static void apbuart_release_port(struct uart_port *port) -{ - release_mem_region(port->mapbase, 0x100); -} - -static int apbuart_request_port(struct uart_port *port) -{ - return request_mem_region(port->mapbase, 0x100, "grlib-apbuart") - != NULL ? 0 : -EBUSY; - return 0; -} - -/* Configure/autoconfigure the port */ -static void apbuart_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) { - port->type = PORT_APBUART; - apbuart_request_port(port); - } -} - -/* Verify the new serial_struct (for TIOCSSERIAL) */ -static int apbuart_verify_port(struct uart_port *port, - struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART) - 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 grlib_apbuart_ops = { - .tx_empty = apbuart_tx_empty, - .set_mctrl = apbuart_set_mctrl, - .get_mctrl = apbuart_get_mctrl, - .stop_tx = apbuart_stop_tx, - .start_tx = apbuart_start_tx, - .stop_rx = apbuart_stop_rx, - .enable_ms = apbuart_enable_ms, - .break_ctl = apbuart_break_ctl, - .startup = apbuart_startup, - .shutdown = apbuart_shutdown, - .set_termios = apbuart_set_termios, - .type = apbuart_type, - .release_port = apbuart_release_port, - .request_port = apbuart_request_port, - .config_port = apbuart_config_port, - .verify_port = apbuart_verify_port, -}; - -static struct uart_port grlib_apbuart_ports[UART_NR]; -static struct device_node *grlib_apbuart_nodes[UART_NR]; - -static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber) -{ - int ctrl, loop = 0; - int status; - int fifosize; - unsigned long flags; - - ctrl = UART_GET_CTRL(port); - - /* - * Enable the transceiver and wait for it to be ready to send data. - * Clear interrupts so that this process will not be externally - * interrupted in the middle (which can cause the transceiver to - * drain prematurely). - */ - - local_irq_save(flags); - - UART_PUT_CTRL(port, ctrl | UART_CTRL_TE); - - while (!UART_TX_READY(UART_GET_STATUS(port))) - loop++; - - /* - * Disable the transceiver so data isn't actually sent during the - * actual test. - */ - - UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE)); - - fifosize = 1; - UART_PUT_CHAR(port, 0); - - /* - * So long as transmitting a character increments the tranceivier FIFO - * length the FIFO must be at least that big. These bytes will - * automatically drain off of the FIFO. - */ - - status = UART_GET_STATUS(port); - while (((status >> 20) & 0x3F) == fifosize) { - fifosize++; - UART_PUT_CHAR(port, 0); - status = UART_GET_STATUS(port); - } - - fifosize--; - - UART_PUT_CTRL(port, ctrl); - local_irq_restore(flags); - - if (fifosize == 0) - fifosize = 1; - - return fifosize; -} - -static void apbuart_flush_fifo(struct uart_port *port) -{ - int i; - - for (i = 0; i < port->fifosize; i++) - UART_GET_CHAR(port); -} - - -/* ======================================================================== */ -/* Console driver, if enabled */ -/* ======================================================================== */ - -#ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE - -static void apbuart_console_putchar(struct uart_port *port, int ch) -{ - unsigned int status; - do { - status = UART_GET_STATUS(port); - } while (!UART_TX_READY(status)); - UART_PUT_CHAR(port, ch); -} - -static void -apbuart_console_write(struct console *co, const char *s, unsigned int count) -{ - struct uart_port *port = &grlib_apbuart_ports[co->index]; - unsigned int status, old_cr, new_cr; - - /* First save the CR then disable the interrupts */ - old_cr = UART_GET_CTRL(port); - new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI); - UART_PUT_CTRL(port, new_cr); - - uart_console_write(port, s, count, apbuart_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore the TCR - */ - do { - status = UART_GET_STATUS(port); - } while (!UART_TX_READY(status)); - UART_PUT_CTRL(port, old_cr); -} - -static void __init -apbuart_console_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) { - - unsigned int quot, status; - status = UART_GET_STATUS(port); - - *parity = 'n'; - if (status & UART_CTRL_PE) { - if ((status & UART_CTRL_PS) == 0) - *parity = 'e'; - else - *parity = 'o'; - } - - *bits = 8; - quot = UART_GET_SCAL(port) / 8; - *baud = port->uartclk / (16 * (quot + 1)); - } -} - -static int __init apbuart_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 38400; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n", - co, co->index, options); - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - if (co->index >= grlib_apbuart_port_nr) - co->index = 0; - - port = &grlib_apbuart_ports[co->index]; - - spin_lock_init(&port->lock); - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - apbuart_console_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver grlib_apbuart_driver; - -static struct console grlib_apbuart_console = { - .name = "ttyS", - .write = apbuart_console_write, - .device = uart_console_device, - .setup = apbuart_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &grlib_apbuart_driver, -}; - - -static int grlib_apbuart_configure(void); - -static int __init apbuart_console_init(void) -{ - if (grlib_apbuart_configure()) - return -ENODEV; - register_console(&grlib_apbuart_console); - return 0; -} - -console_initcall(apbuart_console_init); - -#define APBUART_CONSOLE (&grlib_apbuart_console) -#else -#define APBUART_CONSOLE NULL -#endif - -static struct uart_driver grlib_apbuart_driver = { - .owner = THIS_MODULE, - .driver_name = "serial", - .dev_name = "ttyS", - .major = SERIAL_APBUART_MAJOR, - .minor = SERIAL_APBUART_MINOR, - .nr = UART_NR, - .cons = APBUART_CONSOLE, -}; - - -/* ======================================================================== */ -/* OF Platform Driver */ -/* ======================================================================== */ - -static int __devinit apbuart_probe(struct platform_device *op, - const struct of_device_id *match) -{ - int i = -1; - struct uart_port *port = NULL; - - i = 0; - for (i = 0; i < grlib_apbuart_port_nr; i++) { - if (op->dev.of_node == grlib_apbuart_nodes[i]) - break; - } - - port = &grlib_apbuart_ports[i]; - port->dev = &op->dev; - - uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port); - - apbuart_flush_fifo((struct uart_port *) port); - - printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n", - (unsigned long long) port->mapbase, port->irq); - return 0; -} - -static struct of_device_id __initdata apbuart_match[] = { - { - .name = "GAISLER_APBUART", - }, - { - .name = "01_00c", - }, - {}, -}; - -static struct of_platform_driver grlib_apbuart_of_driver = { - .probe = apbuart_probe, - .driver = { - .owner = THIS_MODULE, - .name = "grlib-apbuart", - .of_match_table = apbuart_match, - }, -}; - - -static int grlib_apbuart_configure(void) -{ - struct device_node *np, *rp; - const u32 *prop; - int freq_khz, line = 0; - - /* Get bus frequency */ - rp = of_find_node_by_path("/"); - if (!rp) - return -ENODEV; - rp = of_get_next_child(rp, NULL); - if (!rp) - return -ENODEV; - prop = of_get_property(rp, "clock-frequency", NULL); - if (!prop) - return -ENODEV; - freq_khz = *prop; - - for_each_matching_node(np, apbuart_match) { - const int *irqs, *ampopts; - const struct amba_prom_registers *regs; - struct uart_port *port; - unsigned long addr; - - ampopts = of_get_property(np, "ampopts", NULL); - if (ampopts && (*ampopts == 0)) - continue; /* Ignore if used by another OS instance */ - - irqs = of_get_property(np, "interrupts", NULL); - regs = of_get_property(np, "reg", NULL); - - if (!irqs || !regs) - continue; - - grlib_apbuart_nodes[line] = np; - - addr = regs->phys_addr; - - port = &grlib_apbuart_ports[line]; - - port->mapbase = addr; - port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map)); - port->irq = *irqs; - port->iotype = UPIO_MEM; - port->ops = &grlib_apbuart_ops; - port->flags = UPF_BOOT_AUTOCONF; - port->line = line; - port->uartclk = freq_khz * 1000; - port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line); - line++; - - /* We support maximum UART_NR uarts ... */ - if (line == UART_NR) - break; - } - - grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line; - return line ? 0 : -ENODEV; -} - -static int __init grlib_apbuart_init(void) -{ - int ret; - - /* Find all APBUARTS in device the tree and initialize their ports */ - ret = grlib_apbuart_configure(); - if (ret) - return ret; - - printk(KERN_INFO "Serial: GRLIB APBUART driver\n"); - - ret = uart_register_driver(&grlib_apbuart_driver); - - if (ret) { - printk(KERN_ERR "%s: uart_register_driver failed (%i)\n", - __FILE__, ret); - return ret; - } - - ret = of_register_platform_driver(&grlib_apbuart_of_driver); - if (ret) { - printk(KERN_ERR - "%s: of_register_platform_driver failed (%i)\n", - __FILE__, ret); - uart_unregister_driver(&grlib_apbuart_driver); - return ret; - } - - return ret; -} - -static void __exit grlib_apbuart_exit(void) -{ - int i; - - for (i = 0; i < grlib_apbuart_port_nr; i++) - uart_remove_one_port(&grlib_apbuart_driver, - &grlib_apbuart_ports[i]); - - uart_unregister_driver(&grlib_apbuart_driver); - of_unregister_platform_driver(&grlib_apbuart_of_driver); -} - -module_init(grlib_apbuart_init); -module_exit(grlib_apbuart_exit); - -MODULE_AUTHOR("Aeroflex Gaisler AB"); -MODULE_DESCRIPTION("GRLIB APBUART serial driver"); -MODULE_VERSION("2.1"); -MODULE_LICENSE("GPL"); |