+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Driver for KS8695 serial ports
- *
- * Based on drivers/serial/serial_amba.c, by Kam Lee.
- *
- * Copyright 2002-2005 Micrel Inc.
- */
-#include <linux/module.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/ioport.h>
-#include <linux/init.h>
-#include <linux/serial.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/device.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/mach/irq.h>
-
-#include <mach/regs-uart.h>
-#include <mach/regs-irq.h>
-
-#if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/serial_core.h>
-
-
-#define SERIAL_KS8695_MAJOR 204
-#define SERIAL_KS8695_MINOR 16
-#define SERIAL_KS8695_DEVNAME "ttyAM"
-
-#define SERIAL_KS8695_NR 1
-
-/*
- * Access macros for the KS8695 UART
- */
-#define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
-#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH)
-#define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC)
-#define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC)
-#define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS)
-#define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS)
-#define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC)
-#define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC)
-#define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC)
-#define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC)
-#define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD)
-#define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD)
-
-#define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)
-
-#define UART_DUMMY_LSR_RX 0x100
-#define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4)
-
-static inline int tx_enabled(struct uart_port *port)
-{
- return port->unused[0] & 1;
-}
-
-static inline int rx_enabled(struct uart_port *port)
-{
- return port->unused[0] & 2;
-}
-
-static inline int ms_enabled(struct uart_port *port)
-{
- return port->unused[0] & 4;
-}
-
-static inline void ms_enable(struct uart_port *port, int enabled)
-{
- if(enabled)
- port->unused[0] |= 4;
- else
- port->unused[0] &= ~4;
-}
-
-static inline void rx_enable(struct uart_port *port, int enabled)
-{
- if(enabled)
- port->unused[0] |= 2;
- else
- port->unused[0] &= ~2;
-}
-
-static inline void tx_enable(struct uart_port *port, int enabled)
-{
- if(enabled)
- port->unused[0] |= 1;
- else
- port->unused[0] &= ~1;
-}
-
-
-#ifdef SUPPORT_SYSRQ
-static struct console ks8695_console;
-#endif
-
-static void ks8695uart_stop_tx(struct uart_port *port)
-{
- if (tx_enabled(port)) {
- /* use disable_irq_nosync() and not disable_irq() to avoid self
- * imposed deadlock by not waiting for irq handler to end,
- * since this ks8695uart_stop_tx() is called from interrupt context.
- */
- disable_irq_nosync(KS8695_IRQ_UART_TX);
- tx_enable(port, 0);
- }
-}
-
-static void ks8695uart_start_tx(struct uart_port *port)
-{
- if (!tx_enabled(port)) {
- enable_irq(KS8695_IRQ_UART_TX);
- tx_enable(port, 1);
- }
-}
-
-static void ks8695uart_stop_rx(struct uart_port *port)
-{
- if (rx_enabled(port)) {
- disable_irq(KS8695_IRQ_UART_RX);
- rx_enable(port, 0);
- }
-}
-
-static void ks8695uart_enable_ms(struct uart_port *port)
-{
- if (!ms_enabled(port)) {
- enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
- ms_enable(port,1);
- }
-}
-
-static void ks8695uart_disable_ms(struct uart_port *port)
-{
- if (ms_enabled(port)) {
- disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
- ms_enable(port,0);
- }
-}
-
-static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- unsigned int status, ch, lsr, flg, max_count = 256;
-
- status = UART_GET_LSR(port); /* clears pending LSR interrupts */
- while ((status & URLS_URDR) && max_count--) {
- ch = UART_GET_CHAR(port);
- flg = TTY_NORMAL;
-
- port->icount.rx++;
-
- /*
- * Note that the error handling code is
- * out of the main execution path
- */
- lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX;
- if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) {
- if (lsr & URLS_URBI) {
- lsr &= ~(URLS_URFE | URLS_URPE);
- port->icount.brk++;
- if (uart_handle_break(port))
- goto ignore_char;
- }
- if (lsr & URLS_URPE)
- port->icount.parity++;
- if (lsr & URLS_URFE)
- port->icount.frame++;
- if (lsr & URLS_URROE)
- port->icount.overrun++;
-
- lsr &= port->read_status_mask;
-
- if (lsr & URLS_URBI)
- flg = TTY_BREAK;
- else if (lsr & URLS_URPE)
- flg = TTY_PARITY;
- else if (lsr & URLS_URFE)
- flg = TTY_FRAME;
- }
-
- if (uart_handle_sysrq_char(port, ch))
- goto ignore_char;
-
- uart_insert_char(port, lsr, URLS_URROE, ch, flg);
-
-ignore_char:
- status = UART_GET_LSR(port);
- }
- tty_flip_buffer_push(&port->state->port);
-
- return IRQ_HANDLED;
-}
-
-
-static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int count;
-
- if (port->x_char) {
- KS8695_CLR_TX_INT();
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return IRQ_HANDLED;
- }
-
- if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
- ks8695uart_stop_tx(port);
- return IRQ_HANDLED;
- }
-
- count = 16; /* fifo size */
- while (!uart_circ_empty(xmit) && (count-- > 0)) {
- KS8695_CLR_TX_INT();
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
-
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- ks8695uart_stop_tx(port);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- unsigned int status;
-
- /*
- * clear modem interrupt by reading MSR
- */
- status = UART_GET_MSR(port);
-
- if (status & URMS_URDDCD)
- uart_handle_dcd_change(port, status & URMS_URDDCD);
-
- if (status & URMS_URDDST)
- port->icount.dsr++;
-
- if (status & URMS_URDCTS)
- uart_handle_cts_change(port, status & URMS_URDCTS);
-
- if (status & URMS_URTERI)
- port->icount.rng++;
-
- wake_up_interruptible(&port->state->port.delta_msr_wait);
-
- return IRQ_HANDLED;
-}
-
-static unsigned int ks8695uart_tx_empty(struct uart_port *port)
-{
- return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
-}
-
-static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
-{
- unsigned int result = 0;
- unsigned int status;
-
- status = UART_GET_MSR(port);
- if (status & URMS_URDCD)
- result |= TIOCM_CAR;
- if (status & URMS_URDSR)
- result |= TIOCM_DSR;
- if (status & URMS_URCTS)
- result |= TIOCM_CTS;
- if (status & URMS_URRI)
- result |= TIOCM_RI;
-
- return result;
-}
-
-static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
-{
- unsigned int mcr;
-
- mcr = UART_GET_MCR(port);
- if (mctrl & TIOCM_RTS)
- mcr |= URMC_URRTS;
- else
- mcr &= ~URMC_URRTS;
-
- if (mctrl & TIOCM_DTR)
- mcr |= URMC_URDTR;
- else
- mcr &= ~URMC_URDTR;
-
- UART_PUT_MCR(port, mcr);
-}
-
-static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
-{
- unsigned int lcr;
-
- lcr = UART_GET_LCR(port);
-
- if (break_state == -1)
- lcr |= URLC_URSBC;
- else
- lcr &= ~URLC_URSBC;
-
- UART_PUT_LCR(port, lcr);
-}
-
-static int ks8695uart_startup(struct uart_port *port)
-{
- int retval;
-
- irq_modify_status(KS8695_IRQ_UART_TX, IRQ_NOREQUEST, IRQ_NOAUTOEN);
- tx_enable(port, 0);
- rx_enable(port, 1);
- ms_enable(port, 1);
-
- /*
- * Allocate the IRQ
- */
- retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, 0, "UART TX", port);
- if (retval)
- goto err_tx;
-
- retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, 0, "UART RX", port);
- if (retval)
- goto err_rx;
-
- retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, 0, "UART LineStatus", port);
- if (retval)
- goto err_ls;
-
- retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, 0, "UART ModemStatus", port);
- if (retval)
- goto err_ms;
-
- return 0;
-
-err_ms:
- free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
-err_ls:
- free_irq(KS8695_IRQ_UART_RX, port);
-err_rx:
- free_irq(KS8695_IRQ_UART_TX, port);
-err_tx:
- return retval;
-}
-
-static void ks8695uart_shutdown(struct uart_port *port)
-{
- /*
- * Free the interrupt
- */
- free_irq(KS8695_IRQ_UART_RX, port);
- free_irq(KS8695_IRQ_UART_TX, port);
- free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
- free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
-
- /* disable break condition and fifos */
- UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
- UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
-}
-
-static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
-{
- unsigned int lcr, fcr = 0;
- 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);
- quot = uart_get_divisor(port, baud);
-
- switch (termios->c_cflag & CSIZE) {
- case CS5:
- lcr = URCL_5;
- break;
- case CS6:
- lcr = URCL_6;
- break;
- case CS7:
- lcr = URCL_7;
- break;
- default:
- lcr = URCL_8;
- break;
- }
-
- /* stop bits */
- if (termios->c_cflag & CSTOPB)
- lcr |= URLC_URSB;
-
- /* parity */
- if (termios->c_cflag & PARENB) {
- if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */
- if (termios->c_cflag & PARODD)
- lcr |= URPE_MARK;
- else
- lcr |= URPE_SPACE;
- }
- else if (termios->c_cflag & PARODD)
- lcr |= URPE_ODD;
- else
- lcr |= URPE_EVEN;
- }
-
- if (port->fifosize > 1)
- fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE;
-
- spin_lock_irqsave(&port->lock, flags);
-
- /*
- * Update the per-port timeout.
- */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- port->read_status_mask = URLS_URROE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= (URLS_URFE | URLS_URPE);
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
- port->read_status_mask |= URLS_URBI;
-
- /*
- * Characters to ignore
- */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= (URLS_URFE | URLS_URPE);
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= URLS_URBI;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= URLS_URROE;
- }
-
- /*
- * Ignore all characters if CREAD is not set.
- */
- if ((termios->c_cflag & CREAD) == 0)
- port->ignore_status_mask |= UART_DUMMY_LSR_RX;
-
- /* first, disable everything */
- if (UART_ENABLE_MS(port, termios->c_cflag))
- ks8695uart_enable_ms(port);
- else
- ks8695uart_disable_ms(port);
-
- /* Set baud rate */
- UART_PUT_BRDR(port, quot);
-
- UART_PUT_LCR(port, lcr);
- UART_PUT_FCR(port, fcr);
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *ks8695uart_type(struct uart_port *port)
-{
- return port->type == PORT_KS8695 ? "KS8695" : NULL;
-}
-
-/*
- * Release the memory region(s) being used by 'port'
- */
-static void ks8695uart_release_port(struct uart_port *port)
-{
- release_mem_region(port->mapbase, UART_PORT_SIZE);
-}
-
-/*
- * Request the memory region(s) being used by 'port'
- */
-static int ks8695uart_request_port(struct uart_port *port)
-{
- return request_mem_region(port->mapbase, UART_PORT_SIZE,
- "serial_ks8695") != NULL ? 0 : -EBUSY;
-}
-
-/*
- * Configure/autoconfigure the port.
- */
-static void ks8695uart_config_port(struct uart_port *port, int flags)
-{
- if (flags & UART_CONFIG_TYPE) {
- port->type = PORT_KS8695;
- ks8695uart_request_port(port);
- }
-}
-
-/*
- * verify the new serial_struct (for TIOCSSERIAL).
- */
-static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- int ret = 0;
-
- if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
- ret = -EINVAL;
- if (ser->irq != port->irq)
- ret = -EINVAL;
- if (ser->baud_base < 9600)
- ret = -EINVAL;
- return ret;
-}
-
-static struct uart_ops ks8695uart_pops = {
- .tx_empty = ks8695uart_tx_empty,
- .set_mctrl = ks8695uart_set_mctrl,
- .get_mctrl = ks8695uart_get_mctrl,
- .stop_tx = ks8695uart_stop_tx,
- .start_tx = ks8695uart_start_tx,
- .stop_rx = ks8695uart_stop_rx,
- .enable_ms = ks8695uart_enable_ms,
- .break_ctl = ks8695uart_break_ctl,
- .startup = ks8695uart_startup,
- .shutdown = ks8695uart_shutdown,
- .set_termios = ks8695uart_set_termios,
- .type = ks8695uart_type,
- .release_port = ks8695uart_release_port,
- .request_port = ks8695uart_request_port,
- .config_port = ks8695uart_config_port,
- .verify_port = ks8695uart_verify_port,
-};
-
-static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
- {
- .membase = KS8695_UART_VA,
- .mapbase = KS8695_UART_PA,
- .iotype = SERIAL_IO_MEM,
- .irq = KS8695_IRQ_UART_TX,
- .uartclk = KS8695_CLOCK_RATE * 16,
- .fifosize = 16,
- .ops = &ks8695uart_pops,
- .flags = UPF_BOOT_AUTOCONF,
- .line = 0,
- }
-};
-
-#ifdef CONFIG_SERIAL_KS8695_CONSOLE
-static void ks8695_console_putchar(struct uart_port *port, int ch)
-{
- while (!(UART_GET_LSR(port) & URLS_URTHRE))
- barrier();
-
- UART_PUT_CHAR(port, ch);
-}
-
-static void ks8695_console_write(struct console *co, const char *s, u_int count)
-{
- struct uart_port *port = ks8695uart_ports + co->index;
-
- uart_console_write(port, s, count, ks8695_console_putchar);
-}
-
-static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
-{
- unsigned int lcr;
-
- lcr = UART_GET_LCR(port);
-
- switch (lcr & URLC_PARITY) {
- case URPE_ODD:
- *parity = 'o';
- break;
- case URPE_EVEN:
- *parity = 'e';
- break;
- default:
- *parity = 'n';
- }
-
- switch (lcr & URLC_URCL) {
- case URCL_5:
- *bits = 5;
- break;
- case URCL_6:
- *bits = 6;
- break;
- case URCL_7:
- *bits = 7;
- break;
- default:
- *bits = 8;
- }
-
- *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
- *baud /= 16;
- *baud &= 0xFFFFFFF0;
-}
-
-static int __init ks8695_console_setup(struct console *co, char *options)
-{
- struct uart_port *port;
- int baud = 115200;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- /*
- * Check whether an invalid uart number has been specified, and
- * if so, search for the first available port that does have
- * console support.
- */
- port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co);
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- else
- ks8695_console_get_options(port, &baud, &parity, &bits);
-
- return uart_set_options(port, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver ks8695_reg;
-
-static struct console ks8695_console = {
- .name = SERIAL_KS8695_DEVNAME,
- .write = ks8695_console_write,
- .device = uart_console_device,
- .setup = ks8695_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &ks8695_reg,
-};
-
-static int __init ks8695_console_init(void)
-{
- add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL);
- register_console(&ks8695_console);
- return 0;
-}
-
-console_initcall(ks8695_console_init);
-
-#define KS8695_CONSOLE &ks8695_console
-#else
-#define KS8695_CONSOLE NULL
-#endif
-
-static struct uart_driver ks8695_reg = {
- .owner = THIS_MODULE,
- .driver_name = "serial_ks8695",
- .dev_name = SERIAL_KS8695_DEVNAME,
- .major = SERIAL_KS8695_MAJOR,
- .minor = SERIAL_KS8695_MINOR,
- .nr = SERIAL_KS8695_NR,
- .cons = KS8695_CONSOLE,
-};
-
-static int __init ks8695uart_init(void)
-{
- int i, ret;
-
- printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");
-
- ret = uart_register_driver(&ks8695_reg);
- if (ret)
- return ret;
-
- for (i = 0; i < SERIAL_KS8695_NR; i++)
- uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);
-
- return 0;
-}
-
-static void __exit ks8695uart_exit(void)
-{
- int i;
-
- for (i = 0; i < SERIAL_KS8695_NR; i++)
- uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
- uart_unregister_driver(&ks8695_reg);
-}
-
-module_init(ks8695uart_init);
-module_exit(ks8695uart_exit);
-
-MODULE_DESCRIPTION("KS8695 serial port driver");
-MODULE_AUTHOR("Micrel Inc.");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff