+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Blackfin On-Chip Sport Emulated UART Driver
- *
- * Copyright 2006-2009 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- */
-
-/*
- * This driver and the hardware supported are in term of EE-191 of ADI.
- * http://www.analog.com/static/imported-files/application_notes/EE191.pdf
- * This application note describe how to implement a UART on a Sharc DSP,
- * but this driver is implemented on Blackfin Processor.
- * Transmit Frame Sync is not used by this driver to transfer data out.
- */
-
-/* #define DEBUG */
-
-#define DRV_NAME "bfin-sport-uart"
-#define DEVICE_NAME "ttySS"
-#define pr_fmt(fmt) DRV_NAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/slab.h>
-#include <linux/platform_device.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/gpio.h>
-
-#include <asm/bfin_sport.h>
-#include <asm/delay.h>
-#include <asm/portmux.h>
-
-#include "bfin_sport_uart.h"
-
-struct sport_uart_port {
- struct uart_port port;
- int err_irq;
- unsigned short csize;
- unsigned short rxmask;
- unsigned short txmask1;
- unsigned short txmask2;
- unsigned char stopb;
-/* unsigned char parib; */
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- int cts_pin;
- int rts_pin;
-#endif
-};
-
-static int sport_uart_tx_chars(struct sport_uart_port *up);
-static void sport_stop_tx(struct uart_port *port);
-
-static inline void tx_one_byte(struct sport_uart_port *up, unsigned int value)
-{
- pr_debug("%s value:%x, mask1=0x%x, mask2=0x%x\n", __func__, value,
- up->txmask1, up->txmask2);
-
- /* Place Start and Stop bits */
- __asm__ __volatile__ (
- "%[val] <<= 1;"
- "%[val] = %[val] & %[mask1];"
- "%[val] = %[val] | %[mask2];"
- : [val]"+d"(value)
- : [mask1]"d"(up->txmask1), [mask2]"d"(up->txmask2)
- : "ASTAT"
- );
- pr_debug("%s value:%x\n", __func__, value);
-
- SPORT_PUT_TX(up, value);
-}
-
-static inline unsigned char rx_one_byte(struct sport_uart_port *up)
-{
- unsigned int value;
- unsigned char extract;
- u32 tmp_mask1, tmp_mask2, tmp_shift, tmp;
-
- if ((up->csize + up->stopb) > 7)
- value = SPORT_GET_RX32(up);
- else
- value = SPORT_GET_RX(up);
-
- pr_debug("%s value:%x, cs=%d, mask=0x%x\n", __func__, value,
- up->csize, up->rxmask);
-
- /* Extract data */
- __asm__ __volatile__ (
- "%[extr] = 0;"
- "%[mask1] = %[rxmask];"
- "%[mask2] = 0x0200(Z);"
- "%[shift] = 0;"
- "LSETUP(.Lloop_s, .Lloop_e) LC0 = %[lc];"
- ".Lloop_s:"
- "%[tmp] = extract(%[val], %[mask1].L)(Z);"
- "%[tmp] <<= %[shift];"
- "%[extr] = %[extr] | %[tmp];"
- "%[mask1] = %[mask1] - %[mask2];"
- ".Lloop_e:"
- "%[shift] += 1;"
- : [extr]"=&d"(extract), [shift]"=&d"(tmp_shift), [tmp]"=&d"(tmp),
- [mask1]"=&d"(tmp_mask1), [mask2]"=&d"(tmp_mask2)
- : [val]"d"(value), [rxmask]"d"(up->rxmask), [lc]"a"(up->csize)
- : "ASTAT", "LB0", "LC0", "LT0"
- );
-
- pr_debug(" extract:%x\n", extract);
- return extract;
-}
-
-static int sport_uart_setup(struct sport_uart_port *up, int size, int baud_rate)
-{
- int tclkdiv, rclkdiv;
- unsigned int sclk = get_sclk();
-
- /* Set TCR1 and TCR2, TFSR is not enabled for uart */
- SPORT_PUT_TCR1(up, (LATFS | ITFS | TFSR | TLSBIT | ITCLK));
- SPORT_PUT_TCR2(up, size + 1);
- pr_debug("%s TCR1:%x, TCR2:%x\n", __func__, SPORT_GET_TCR1(up), SPORT_GET_TCR2(up));
-
- /* Set RCR1 and RCR2 */
- SPORT_PUT_RCR1(up, (RCKFE | LARFS | LRFS | RFSR | IRCLK));
- SPORT_PUT_RCR2(up, (size + 1) * 2 - 1);
- pr_debug("%s RCR1:%x, RCR2:%x\n", __func__, SPORT_GET_RCR1(up), SPORT_GET_RCR2(up));
-
- tclkdiv = sclk / (2 * baud_rate) - 1;
- /* The actual uart baud rate of devices vary between +/-2%. The sport
- * RX sample rate should be faster than the double of the worst case,
- * otherwise, wrong data are received. So, set sport RX clock to be
- * 3% faster.
- */
- rclkdiv = sclk / (2 * baud_rate * 2 * 97 / 100) - 1;
- SPORT_PUT_TCLKDIV(up, tclkdiv);
- SPORT_PUT_RCLKDIV(up, rclkdiv);
- SSYNC();
- pr_debug("%s sclk:%d, baud_rate:%d, tclkdiv:%d, rclkdiv:%d\n",
- __func__, sclk, baud_rate, tclkdiv, rclkdiv);
-
- return 0;
-}
-
-static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
-{
- struct sport_uart_port *up = dev_id;
- struct tty_port *port = &up->port.state->port;
- unsigned int ch;
-
- spin_lock(&up->port.lock);
-
- while (SPORT_GET_STAT(up) & RXNE) {
- ch = rx_one_byte(up);
- up->port.icount.rx++;
-
- if (!uart_handle_sysrq_char(&up->port, ch))
- tty_insert_flip_char(port, ch, TTY_NORMAL);
- }
-
- spin_unlock(&up->port.lock);
-
- /* XXX this won't deadlock with lowlat? */
- tty_flip_buffer_push(port);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t sport_uart_tx_irq(int irq, void *dev_id)
-{
- struct sport_uart_port *up = dev_id;
-
- spin_lock(&up->port.lock);
- sport_uart_tx_chars(up);
- spin_unlock(&up->port.lock);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t sport_uart_err_irq(int irq, void *dev_id)
-{
- struct sport_uart_port *up = dev_id;
- unsigned int stat = SPORT_GET_STAT(up);
-
- spin_lock(&up->port.lock);
-
- /* Overflow in RX FIFO */
- if (stat & ROVF) {
- up->port.icount.overrun++;
- tty_insert_flip_char(&up->port.state->port, 0, TTY_OVERRUN);
- SPORT_PUT_STAT(up, ROVF); /* Clear ROVF bit */
- }
- /* These should not happen */
- if (stat & (TOVF | TUVF | RUVF)) {
- pr_err("SPORT Error:%s %s %s\n",
- (stat & TOVF) ? "TX overflow" : "",
- (stat & TUVF) ? "TX underflow" : "",
- (stat & RUVF) ? "RX underflow" : "");
- SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
- SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
- }
- SSYNC();
-
- spin_unlock(&up->port.lock);
- /* XXX we don't push the overrun bit to TTY? */
-
- return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
-static unsigned int sport_get_mctrl(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
- if (up->cts_pin < 0)
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-
- /* CTS PIN is negative assertive. */
- if (SPORT_UART_GET_CTS(up))
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
- else
- return TIOCM_DSR | TIOCM_CAR;
-}
-
-static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
- if (up->rts_pin < 0)
- return;
-
- /* RTS PIN is negative assertive. */
- if (mctrl & TIOCM_RTS)
- SPORT_UART_ENABLE_RTS(up);
- else
- SPORT_UART_DISABLE_RTS(up);
-}
-
-/*
- * Handle any change of modem status signal.
- */
-static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
- unsigned int status;
-
- status = sport_get_mctrl(&up->port);
- uart_handle_cts_change(&up->port, status & TIOCM_CTS);
-
- return IRQ_HANDLED;
-}
-#else
-static unsigned int sport_get_mctrl(struct uart_port *port)
-{
- pr_debug("%s enter\n", __func__);
- return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
-}
-
-static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- pr_debug("%s enter\n", __func__);
-}
-#endif
-
-/* Reqeust IRQ, Setup clock */
-static int sport_startup(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
- int ret;
-
- pr_debug("%s enter\n", __func__);
- ret = request_irq(up->port.irq, sport_uart_rx_irq, 0,
- "SPORT_UART_RX", up);
- if (ret) {
- dev_err(port->dev, "unable to request SPORT RX interrupt\n");
- return ret;
- }
-
- ret = request_irq(up->port.irq+1, sport_uart_tx_irq, 0,
- "SPORT_UART_TX", up);
- if (ret) {
- dev_err(port->dev, "unable to request SPORT TX interrupt\n");
- goto fail1;
- }
-
- ret = request_irq(up->err_irq, sport_uart_err_irq, 0,
- "SPORT_UART_STATUS", up);
- if (ret) {
- dev_err(port->dev, "unable to request SPORT status interrupt\n");
- goto fail2;
- }
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- if (up->cts_pin >= 0) {
- if (request_irq(gpio_to_irq(up->cts_pin),
- sport_mctrl_cts_int,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
- 0, "BFIN_SPORT_UART_CTS", up)) {
- up->cts_pin = -1;
- dev_info(port->dev, "Unable to attach BlackFin UART over SPORT CTS interrupt. So, disable it.\n");
- }
- }
- if (up->rts_pin >= 0) {
- if (gpio_request(up->rts_pin, DRV_NAME)) {
- dev_info(port->dev, "fail to request RTS PIN at GPIO_%d\n", up->rts_pin);
- up->rts_pin = -1;
- } else
- gpio_direction_output(up->rts_pin, 0);
- }
-#endif
-
- return 0;
- fail2:
- free_irq(up->port.irq+1, up);
- fail1:
- free_irq(up->port.irq, up);
-
- return ret;
-}
-
-/*
- * sport_uart_tx_chars
- *
- * ret 1 means need to enable sport.
- * ret 0 means do nothing.
- */
-static int sport_uart_tx_chars(struct sport_uart_port *up)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
-
- if (SPORT_GET_STAT(up) & TXF)
- return 0;
-
- if (up->port.x_char) {
- tx_one_byte(up, up->port.x_char);
- up->port.icount.tx++;
- up->port.x_char = 0;
- return 1;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
- /* The waiting loop to stop SPORT TX from TX interrupt is
- * too long. This may block SPORT RX interrupts and cause
- * RX FIFO overflow. So, do stop sport TX only after the last
- * char in TX FIFO is moved into the shift register.
- */
- if (SPORT_GET_STAT(up) & TXHRE)
- sport_stop_tx(&up->port);
- return 0;
- }
-
- while(!(SPORT_GET_STAT(up) & TXF) && !uart_circ_empty(xmit)) {
- tx_one_byte(up, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
- up->port.icount.tx++;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
-
- return 1;
-}
-
-static unsigned int sport_tx_empty(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
- unsigned int stat;
-
- stat = SPORT_GET_STAT(up);
- pr_debug("%s stat:%04x\n", __func__, stat);
- if (stat & TXHRE) {
- return TIOCSER_TEMT;
- } else
- return 0;
-}
-
-static void sport_stop_tx(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- pr_debug("%s enter\n", __func__);
-
- if (!(SPORT_GET_TCR1(up) & TSPEN))
- return;
-
- /* Although the hold register is empty, last byte is still in shift
- * register and not sent out yet. So, put a dummy data into TX FIFO.
- * Then, sport tx stops when last byte is shift out and the dummy
- * data is moved into the shift register.
- */
- SPORT_PUT_TX(up, 0xffff);
- while (!(SPORT_GET_STAT(up) & TXHRE))
- cpu_relax();
-
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
- SSYNC();
-
- return;
-}
-
-static void sport_start_tx(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- pr_debug("%s enter\n", __func__);
-
- /* Write data into SPORT FIFO before enable SPROT to transmit */
- if (sport_uart_tx_chars(up)) {
- /* Enable transmit, then an interrupt will generated */
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
- SSYNC();
- }
-
- pr_debug("%s exit\n", __func__);
-}
-
-static void sport_stop_rx(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- pr_debug("%s enter\n", __func__);
- /* Disable sport to stop rx */
- SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
- SSYNC();
-}
-
-static void sport_break_ctl(struct uart_port *port, int break_state)
-{
- pr_debug("%s enter\n", __func__);
-}
-
-static void sport_shutdown(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- dev_dbg(port->dev, "%s enter\n", __func__);
-
- /* Disable sport */
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
- SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
- SSYNC();
-
- free_irq(up->port.irq, up);
- free_irq(up->port.irq+1, up);
- free_irq(up->err_irq, up);
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- if (up->cts_pin >= 0)
- free_irq(gpio_to_irq(up->cts_pin), up);
- if (up->rts_pin >= 0)
- gpio_free(up->rts_pin);
-#endif
-}
-
-static const char *sport_type(struct uart_port *port)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- pr_debug("%s enter\n", __func__);
- return up->port.type == PORT_BFIN_SPORT ? "BFIN-SPORT-UART" : NULL;
-}
-
-static void sport_release_port(struct uart_port *port)
-{
- pr_debug("%s enter\n", __func__);
-}
-
-static int sport_request_port(struct uart_port *port)
-{
- pr_debug("%s enter\n", __func__);
- return 0;
-}
-
-static void sport_config_port(struct uart_port *port, int flags)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- pr_debug("%s enter\n", __func__);
- up->port.type = PORT_BFIN_SPORT;
-}
-
-static int sport_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- pr_debug("%s enter\n", __func__);
- return 0;
-}
-
-static void sport_set_termios(struct uart_port *port,
- struct ktermios *termios, struct ktermios *old)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
- unsigned long flags;
- int i;
-
- pr_debug("%s enter, c_cflag:%08x\n", __func__, termios->c_cflag);
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- if (old == NULL && up->cts_pin != -1)
- termios->c_cflag |= CRTSCTS;
- else if (up->cts_pin == -1)
- termios->c_cflag &= ~CRTSCTS;
-#endif
-
- switch (termios->c_cflag & CSIZE) {
- case CS8:
- up->csize = 8;
- break;
- case CS7:
- up->csize = 7;
- break;
- case CS6:
- up->csize = 6;
- break;
- case CS5:
- up->csize = 5;
- break;
- default:
- pr_warn("requested word length not supported\n");
- break;
- }
-
- if (termios->c_cflag & CSTOPB) {
- up->stopb = 1;
- }
- if (termios->c_cflag & PARENB) {
- pr_warn("PAREN bit is not supported yet\n");
- /* up->parib = 1; */
- }
-
- spin_lock_irqsave(&up->port.lock, flags);
-
- port->read_status_mask = 0;
-
- /*
- * Characters to ignore
- */
- port->ignore_status_mask = 0;
-
- /* RX extract mask */
- up->rxmask = 0x01 | (((up->csize + up->stopb) * 2 - 1) << 0x8);
- /* TX masks, 8 bit data and 1 bit stop for example:
- * mask1 = b#0111111110
- * mask2 = b#1000000000
- */
- for (i = 0, up->txmask1 = 0; i < up->csize; i++)
- up->txmask1 |= (1<<i);
- up->txmask2 = (1<<i);
- if (up->stopb) {
- ++i;
- up->txmask2 |= (1<<i);
- }
- up->txmask1 <<= 1;
- up->txmask2 <<= 1;
- /* uart baud rate */
- port->uartclk = uart_get_baud_rate(port, termios, old, 0, get_sclk()/16);
-
- /* Disable UART */
- SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
- SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
-
- sport_uart_setup(up, up->csize + up->stopb, port->uartclk);
-
- /* driver TX line high after config, one dummy data is
- * necessary to stop sport after shift one byte
- */
- SPORT_PUT_TX(up, 0xffff);
- SPORT_PUT_TX(up, 0xffff);
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
- SSYNC();
- while (!(SPORT_GET_STAT(up) & TXHRE))
- cpu_relax();
- SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
- SSYNC();
-
- /* Port speed changed, update the per-port timeout. */
- uart_update_timeout(port, termios->c_cflag, port->uartclk);
-
- /* Enable sport rx */
- SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) | RSPEN);
- SSYNC();
-
- spin_unlock_irqrestore(&up->port.lock, flags);
-}
-
-static const struct uart_ops sport_uart_ops = {
- .tx_empty = sport_tx_empty,
- .set_mctrl = sport_set_mctrl,
- .get_mctrl = sport_get_mctrl,
- .stop_tx = sport_stop_tx,
- .start_tx = sport_start_tx,
- .stop_rx = sport_stop_rx,
- .break_ctl = sport_break_ctl,
- .startup = sport_startup,
- .shutdown = sport_shutdown,
- .set_termios = sport_set_termios,
- .type = sport_type,
- .release_port = sport_release_port,
- .request_port = sport_request_port,
- .config_port = sport_config_port,
- .verify_port = sport_verify_port,
-};
-
-#define BFIN_SPORT_UART_MAX_PORTS 4
-
-static struct sport_uart_port *bfin_sport_uart_ports[BFIN_SPORT_UART_MAX_PORTS];
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
-#define CLASS_BFIN_SPORT_CONSOLE "bfin-sport-console"
-
-static int __init
-sport_uart_console_setup(struct console *co, char *options)
-{
- struct sport_uart_port *up;
- int baud = 57600;
- int bits = 8;
- int parity = 'n';
-# ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- int flow = 'r';
-# else
- int flow = 'n';
-# endif
-
- /* Check whether an invalid uart number has been specified */
- if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
- return -ENODEV;
-
- up = bfin_sport_uart_ports[co->index];
- if (!up)
- return -ENODEV;
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
-
- return uart_set_options(&up->port, co, baud, parity, bits, flow);
-}
-
-static void sport_uart_console_putchar(struct uart_port *port, int ch)
-{
- struct sport_uart_port *up = (struct sport_uart_port *)port;
-
- while (SPORT_GET_STAT(up) & TXF)
- barrier();
-
- tx_one_byte(up, ch);
-}
-
-/*
- * Interrupts are disabled on entering
- */
-static void
-sport_uart_console_write(struct console *co, const char *s, unsigned int count)
-{
- struct sport_uart_port *up = bfin_sport_uart_ports[co->index];
- unsigned long flags;
-
- spin_lock_irqsave(&up->port.lock, flags);
-
- if (SPORT_GET_TCR1(up) & TSPEN)
- uart_console_write(&up->port, s, count, sport_uart_console_putchar);
- else {
- /* dummy data to start sport */
- while (SPORT_GET_STAT(up) & TXF)
- barrier();
- SPORT_PUT_TX(up, 0xffff);
- /* Enable transmit, then an interrupt will generated */
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
- SSYNC();
-
- uart_console_write(&up->port, s, count, sport_uart_console_putchar);
-
- /* Although the hold register is empty, last byte is still in shift
- * register and not sent out yet. So, put a dummy data into TX FIFO.
- * Then, sport tx stops when last byte is shift out and the dummy
- * data is moved into the shift register.
- */
- while (SPORT_GET_STAT(up) & TXF)
- barrier();
- SPORT_PUT_TX(up, 0xffff);
- while (!(SPORT_GET_STAT(up) & TXHRE))
- barrier();
-
- /* Stop sport tx transfer */
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
- SSYNC();
- }
-
- spin_unlock_irqrestore(&up->port.lock, flags);
-}
-
-static struct uart_driver sport_uart_reg;
-
-static struct console sport_uart_console = {
- .name = DEVICE_NAME,
- .write = sport_uart_console_write,
- .device = uart_console_device,
- .setup = sport_uart_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &sport_uart_reg,
-};
-
-#define SPORT_UART_CONSOLE (&sport_uart_console)
-#else
-#define SPORT_UART_CONSOLE NULL
-#endif /* CONFIG_SERIAL_BFIN_SPORT_CONSOLE */
-
-
-static struct uart_driver sport_uart_reg = {
- .owner = THIS_MODULE,
- .driver_name = DRV_NAME,
- .dev_name = DEVICE_NAME,
- .major = 204,
- .minor = 84,
- .nr = BFIN_SPORT_UART_MAX_PORTS,
- .cons = SPORT_UART_CONSOLE,
-};
-
-#ifdef CONFIG_PM
-static int sport_uart_suspend(struct device *dev)
-{
- struct sport_uart_port *sport = dev_get_drvdata(dev);
-
- dev_dbg(dev, "%s enter\n", __func__);
- if (sport)
- uart_suspend_port(&sport_uart_reg, &sport->port);
-
- return 0;
-}
-
-static int sport_uart_resume(struct device *dev)
-{
- struct sport_uart_port *sport = dev_get_drvdata(dev);
-
- dev_dbg(dev, "%s enter\n", __func__);
- if (sport)
- uart_resume_port(&sport_uart_reg, &sport->port);
-
- return 0;
-}
-
-static const struct dev_pm_ops bfin_sport_uart_dev_pm_ops = {
- .suspend = sport_uart_suspend,
- .resume = sport_uart_resume,
-};
-#endif
-
-static int sport_uart_probe(struct platform_device *pdev)
-{
- struct resource *res;
- struct sport_uart_port *sport;
- int ret = 0;
-
- dev_dbg(&pdev->dev, "%s enter\n", __func__);
-
- if (pdev->id < 0 || pdev->id >= BFIN_SPORT_UART_MAX_PORTS) {
- dev_err(&pdev->dev, "Wrong sport uart platform device id.\n");
- return -ENOENT;
- }
-
- if (bfin_sport_uart_ports[pdev->id] == NULL) {
- bfin_sport_uart_ports[pdev->id] =
- kzalloc(sizeof(struct sport_uart_port), GFP_KERNEL);
- sport = bfin_sport_uart_ports[pdev->id];
- if (!sport) {
- dev_err(&pdev->dev,
- "Fail to malloc sport_uart_port\n");
- return -ENOMEM;
- }
-
- ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
- DRV_NAME);
- if (ret) {
- dev_err(&pdev->dev,
- "Fail to request SPORT peripherals\n");
- goto out_error_free_mem;
- }
-
- spin_lock_init(&sport->port.lock);
- sport->port.fifosize = SPORT_TX_FIFO_SIZE,
- sport->port.ops = &sport_uart_ops;
- sport->port.line = pdev->id;
- sport->port.iotype = UPIO_MEM;
- sport->port.flags = UPF_BOOT_AUTOCONF;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
- ret = -ENOENT;
- goto out_error_free_peripherals;
- }
-
- sport->port.membase = ioremap(res->start, resource_size(res));
- if (!sport->port.membase) {
- dev_err(&pdev->dev, "Cannot map sport IO\n");
- ret = -ENXIO;
- goto out_error_free_peripherals;
- }
- sport->port.mapbase = res->start;
-
- sport->port.irq = platform_get_irq(pdev, 0);
- if ((int)sport->port.irq < 0) {
- dev_err(&pdev->dev, "No sport RX/TX IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-
- sport->err_irq = platform_get_irq(pdev, 1);
- if (sport->err_irq < 0) {
- dev_err(&pdev->dev, "No sport status IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (res == NULL)
- sport->cts_pin = -1;
- else
- sport->cts_pin = res->start;
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 1);
- if (res == NULL)
- sport->rts_pin = -1;
- else
- sport->rts_pin = res->start;
-#endif
- }
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
- if (!is_early_platform_device(pdev)) {
-#endif
- sport = bfin_sport_uart_ports[pdev->id];
- sport->port.dev = &pdev->dev;
- dev_set_drvdata(&pdev->dev, sport);
- ret = uart_add_one_port(&sport_uart_reg, &sport->port);
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
- }
-#endif
- if (!ret)
- return 0;
-
- if (sport) {
-out_error_unmap:
- iounmap(sport->port.membase);
-out_error_free_peripherals:
- peripheral_free_list(dev_get_platdata(&pdev->dev));
-out_error_free_mem:
- kfree(sport);
- bfin_sport_uart_ports[pdev->id] = NULL;
- }
-
- return ret;
-}
-
-static int sport_uart_remove(struct platform_device *pdev)
-{
- struct sport_uart_port *sport = platform_get_drvdata(pdev);
-
- dev_dbg(&pdev->dev, "%s enter\n", __func__);
- dev_set_drvdata(&pdev->dev, NULL);
-
- if (sport) {
- uart_remove_one_port(&sport_uart_reg, &sport->port);
- iounmap(sport->port.membase);
- peripheral_free_list(dev_get_platdata(&pdev->dev));
- kfree(sport);
- bfin_sport_uart_ports[pdev->id] = NULL;
- }
-
- return 0;
-}
-
-static struct platform_driver sport_uart_driver = {
- .probe = sport_uart_probe,
- .remove = sport_uart_remove,
- .driver = {
- .name = DRV_NAME,
-#ifdef CONFIG_PM
- .pm = &bfin_sport_uart_dev_pm_ops,
-#endif
- },
-};
-
-#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
-static struct early_platform_driver early_sport_uart_driver __initdata = {
- .class_str = CLASS_BFIN_SPORT_CONSOLE,
- .pdrv = &sport_uart_driver,
- .requested_id = EARLY_PLATFORM_ID_UNSET,
-};
-
-static int __init sport_uart_rs_console_init(void)
-{
- early_platform_driver_register(&early_sport_uart_driver, DRV_NAME);
-
- early_platform_driver_probe(CLASS_BFIN_SPORT_CONSOLE,
- BFIN_SPORT_UART_MAX_PORTS, 0);
-
- register_console(&sport_uart_console);
-
- return 0;
-}
-console_initcall(sport_uart_rs_console_init);
-#endif
-
-static int __init sport_uart_init(void)
-{
- int ret;
-
- pr_info("Blackfin uart over sport driver\n");
-
- ret = uart_register_driver(&sport_uart_reg);
- if (ret) {
- pr_err("failed to register %s:%d\n",
- sport_uart_reg.driver_name, ret);
- return ret;
- }
-
- ret = platform_driver_register(&sport_uart_driver);
- if (ret) {
- pr_err("failed to register sport uart driver:%d\n", ret);
- uart_unregister_driver(&sport_uart_reg);
- }
-
- return ret;
-}
-module_init(sport_uart_init);
-
-static void __exit sport_uart_exit(void)
-{
- platform_driver_unregister(&sport_uart_driver);
- uart_unregister_driver(&sport_uart_reg);
-}
-module_exit(sport_uart_exit);
-
-MODULE_AUTHOR("Sonic Zhang, Roy Huang");
-MODULE_DESCRIPTION("Blackfin serial over SPORT driver");
-MODULE_LICENSE("GPL");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Blackfin On-Chip Serial Driver
- *
- * Copyright 2006-2011 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- */
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#define DRIVER_NAME "bfin-uart"
-#define pr_fmt(fmt) DRIVER_NAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/gfp.h>
-#include <linux/io.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/platform_device.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/gpio.h>
-#include <linux/irq.h>
-#include <linux/kgdb.h>
-#include <linux/slab.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/portmux.h>
-#include <asm/cacheflush.h>
-#include <asm/dma.h>
-#include <asm/bfin_serial.h>
-
-#ifdef CONFIG_SERIAL_BFIN_MODULE
-# undef CONFIG_EARLY_PRINTK
-#endif
-
-/* UART name and device definitions */
-#define BFIN_SERIAL_DEV_NAME "ttyBF"
-#define BFIN_SERIAL_MAJOR 204
-#define BFIN_SERIAL_MINOR 64
-
-static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
-
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
-
-# ifndef CONFIG_SERIAL_BFIN_PIO
-# error KGDB only support UART in PIO mode.
-# endif
-
-static int kgdboc_port_line;
-static int kgdboc_break_enabled;
-#endif
-/*
- * Setup for console. Argument comes from the menuconfig
- */
-#define DMA_RX_XCOUNT 512
-#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
-
-#define DMA_RX_FLUSH_JIFFIES (HZ / 50)
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
-#else
-static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
-#endif
-
-static void bfin_serial_reset_irda(struct uart_port *port);
-
-#if defined(SERIAL_BFIN_CTSRTS) || \
- defined(SERIAL_BFIN_HARD_CTSRTS)
-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- if (uart->cts_pin < 0)
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-
- /* CTS PIN is negative assertive. */
- if (UART_GET_CTS(uart))
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
- else
- return TIOCM_DSR | TIOCM_CAR;
-}
-
-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- if (uart->rts_pin < 0)
- return;
-
- /* RTS PIN is negative assertive. */
- if (mctrl & TIOCM_RTS)
- UART_ENABLE_RTS(uart);
- else
- UART_DISABLE_RTS(uart);
-}
-
-/*
- * Handle any change of modem status signal.
- */
-static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
- struct uart_port *uport = &uart->port;
- unsigned int status = bfin_serial_get_mctrl(uport);
-#ifdef SERIAL_BFIN_HARD_CTSRTS
-
- UART_CLEAR_SCTS(uart);
- if (uport->hw_stopped) {
- if (status) {
- uport->hw_stopped = 0;
- uart_write_wakeup(uport);
- }
- } else {
- if (!status)
- uport->hw_stopped = 1;
- }
-#else
- uart_handle_cts_change(uport, status & TIOCM_CTS);
-#endif
-
- return IRQ_HANDLED;
-}
-#else
-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
-{
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-}
-
-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-#endif
-
-/*
- * interrupts are disabled on entry
- */
-static void bfin_serial_stop_tx(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-#ifdef CONFIG_SERIAL_BFIN_DMA
- struct circ_buf *xmit = &uart->port.state->xmit;
-#endif
-
- while (!(UART_GET_LSR(uart) & TEMT))
- cpu_relax();
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- disable_dma(uart->tx_dma_channel);
- xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
- uart->port.icount.tx += uart->tx_count;
- uart->tx_count = 0;
- uart->tx_done = 1;
-#else
-#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
- /* Clear TFI bit */
- UART_PUT_LSR(uart, TFI);
-#endif
- UART_CLEAR_IER(uart, ETBEI);
-#endif
-}
-
-/*
- * port is locked and interrupts are disabled
- */
-static void bfin_serial_start_tx(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- struct tty_struct *tty = uart->port.state->port.tty;
-
- /*
- * To avoid losting RX interrupt, we reset IR function
- * before sending data.
- */
- if (tty->termios.c_line == N_IRDA)
- bfin_serial_reset_irda(port);
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- if (uart->tx_done)
- bfin_serial_dma_tx_chars(uart);
-#else
- UART_SET_IER(uart, ETBEI);
- bfin_serial_tx_chars(uart);
-#endif
-}
-
-/*
- * Interrupts are enabled
- */
-static void bfin_serial_stop_rx(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
- UART_CLEAR_IER(uart, ERBFI);
-}
-
-#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
-# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
-# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
-#else
-# define UART_GET_ANOMALY_THRESHOLD(uart) 0
-# define UART_SET_ANOMALY_THRESHOLD(uart, v)
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_PIO
-static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
-{
- unsigned int status, ch, flg;
- static u64 anomaly_start;
-
- status = UART_GET_LSR(uart);
- UART_CLEAR_LSR(uart);
-
- ch = UART_GET_CHAR(uart);
- uart->port.icount.rx++;
-
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- if (kgdb_connected && kgdboc_port_line == uart->port.line
- && kgdboc_break_enabled)
- if (ch == 0x3) {/* Ctrl + C */
- kgdb_breakpoint();
- return;
- }
-
- if (!uart->port.state)
- return;
-#endif
- if (ANOMALY_05000363) {
- /* The BF533 (and BF561) family of processors have a nice anomaly
- * where they continuously generate characters for a "single" break.
- * We have to basically ignore this flood until the "next" valid
- * character comes across. Due to the nature of the flood, it is
- * not possible to reliably catch bytes that are sent too quickly
- * after this break. So application code talking to the Blackfin
- * which sends a break signal must allow at least 1.5 character
- * times after the end of the break for things to stabilize. This
- * timeout was picked as it must absolutely be larger than 1
- * character time +/- some percent. So 1.5 sounds good. All other
- * Blackfin families operate properly. Woo.
- */
- if (anomaly_start > 0) {
- u64 curr, nsecs, threshold_ns;
-
- if ((~ch & (~ch + 1)) & 0xff)
- goto known_good_char;
-
- curr = ktime_get_ns();
- nsecs = curr - anomaly_start;
- if (nsecs >> 32)
- goto known_good_char;
-
- threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart)
- * NSEC_PER_USEC;
- if (nsecs > threshold_ns)
- goto known_good_char;
-
- if (ch)
- anomaly_start = 0;
- else
- anomaly_start = curr;
-
- return;
-
- known_good_char:
- status &= ~BI;
- anomaly_start = 0;
- }
- }
-
- if (status & BI) {
- if (ANOMALY_05000363)
- if (bfin_revid() < 5)
- anomaly_start = ktime_get_ns();
- uart->port.icount.brk++;
- if (uart_handle_break(&uart->port))
- goto ignore_char;
- status &= ~(PE | FE);
- }
- if (status & PE)
- uart->port.icount.parity++;
- if (status & OE)
- uart->port.icount.overrun++;
- if (status & FE)
- uart->port.icount.frame++;
-
- status &= uart->port.read_status_mask;
-
- if (status & BI)
- flg = TTY_BREAK;
- else if (status & PE)
- flg = TTY_PARITY;
- else if (status & FE)
- flg = TTY_FRAME;
- else
- flg = TTY_NORMAL;
-
- if (uart_handle_sysrq_char(&uart->port, ch))
- goto ignore_char;
-
- uart_insert_char(&uart->port, status, OE, ch, flg);
-
- ignore_char:
- tty_flip_buffer_push(&uart->port.state->port);
-}
-
-static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
-{
- struct circ_buf *xmit = &uart->port.state->xmit;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
-#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
- /* Clear TFI bit */
- UART_PUT_LSR(uart, TFI);
-#endif
- /* Anomaly notes:
- * 05000215 - we always clear ETBEI within last UART TX
- * interrupt to end a string. It is always set
- * when start a new tx.
- */
- UART_CLEAR_IER(uart, ETBEI);
- return;
- }
-
- if (uart->port.x_char) {
- UART_PUT_CHAR(uart, uart->port.x_char);
- uart->port.icount.tx++;
- uart->port.x_char = 0;
- }
-
- while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
- UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- uart->port.icount.tx++;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&uart->port);
-}
-
-static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
-
- while (UART_GET_LSR(uart) & DR)
- bfin_serial_rx_chars(uart);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
-
- spin_lock(&uart->port.lock);
- if (UART_GET_LSR(uart) & THRE)
- bfin_serial_tx_chars(uart);
- spin_unlock(&uart->port.lock);
-
- return IRQ_HANDLED;
-}
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
-{
- struct circ_buf *xmit = &uart->port.state->xmit;
-
- uart->tx_done = 0;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
- uart->tx_count = 0;
- uart->tx_done = 1;
- return;
- }
-
- if (uart->port.x_char) {
- UART_PUT_CHAR(uart, uart->port.x_char);
- uart->port.icount.tx++;
- uart->port.x_char = 0;
- }
-
- uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
- if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
- uart->tx_count = UART_XMIT_SIZE - xmit->tail;
- blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
- (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
- set_dma_config(uart->tx_dma_channel,
- set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
- INTR_ON_BUF,
- DIMENSION_LINEAR,
- DATA_SIZE_8,
- DMA_SYNC_RESTART));
- set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
- set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
- set_dma_x_modify(uart->tx_dma_channel, 1);
- SSYNC();
- enable_dma(uart->tx_dma_channel);
-
- UART_SET_IER(uart, ETBEI);
-}
-
-static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
-{
- int i, flg, status;
-
- status = UART_GET_LSR(uart);
- UART_CLEAR_LSR(uart);
-
- uart->port.icount.rx +=
- CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
- UART_XMIT_SIZE);
-
- if (status & BI) {
- uart->port.icount.brk++;
- if (uart_handle_break(&uart->port))
- goto dma_ignore_char;
- status &= ~(PE | FE);
- }
- if (status & PE)
- uart->port.icount.parity++;
- if (status & OE)
- uart->port.icount.overrun++;
- if (status & FE)
- uart->port.icount.frame++;
-
- status &= uart->port.read_status_mask;
-
- if (status & BI)
- flg = TTY_BREAK;
- else if (status & PE)
- flg = TTY_PARITY;
- else if (status & FE)
- flg = TTY_FRAME;
- else
- flg = TTY_NORMAL;
-
- for (i = uart->rx_dma_buf.tail; ; i++) {
- if (i >= UART_XMIT_SIZE)
- i = 0;
- if (i == uart->rx_dma_buf.head)
- break;
- if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
- uart_insert_char(&uart->port, status, OE,
- uart->rx_dma_buf.buf[i], flg);
- }
-
- dma_ignore_char:
- tty_flip_buffer_push(&uart->port.state->port);
-}
-
-void bfin_serial_rx_dma_timeout(struct timer_list *t)
-{
- struct bfin_serial_port *uart = from_timer(uart, t, rx_dma_timer);
- int x_pos, pos;
- unsigned long flags;
-
- dma_disable_irq_nosync(uart->rx_dma_channel);
- spin_lock_irqsave(&uart->rx_lock, flags);
-
- /* 2D DMA RX buffer ring is used. Because curr_y_count and
- * curr_x_count can't be read as an atomic operation,
- * curr_y_count should be read before curr_x_count. When
- * curr_x_count is read, curr_y_count may already indicate
- * next buffer line. But, the position calculated here is
- * still indicate the old line. The wrong position data may
- * be smaller than current buffer tail, which cause garbages
- * are received if it is not prohibit.
- */
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
- uart->rx_dma_nrows = 0;
- x_pos = DMA_RX_XCOUNT - x_pos;
- if (x_pos == DMA_RX_XCOUNT)
- x_pos = 0;
-
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
- /* Ignore receiving data if new position is in the same line of
- * current buffer tail and small.
- */
- if (pos > uart->rx_dma_buf.tail ||
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
- uart->rx_dma_buf.head = pos;
- bfin_serial_dma_rx_chars(uart);
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
- }
-
- spin_unlock_irqrestore(&uart->rx_lock, flags);
- dma_enable_irq(uart->rx_dma_channel);
-
- mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
-}
-
-static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
- struct circ_buf *xmit = &uart->port.state->xmit;
-
- spin_lock(&uart->port.lock);
- if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
- disable_dma(uart->tx_dma_channel);
- clear_dma_irqstat(uart->tx_dma_channel);
- /* Anomaly notes:
- * 05000215 - we always clear ETBEI within last UART TX
- * interrupt to end a string. It is always set
- * when start a new tx.
- */
- UART_CLEAR_IER(uart, ETBEI);
- uart->port.icount.tx += uart->tx_count;
- if (!(xmit->tail == 0 && xmit->head == 0)) {
- xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&uart->port);
- }
-
- bfin_serial_dma_tx_chars(uart);
- }
-
- spin_unlock(&uart->port.lock);
- return IRQ_HANDLED;
-}
-
-static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
- unsigned int irqstat;
- int x_pos, pos;
-
- spin_lock(&uart->rx_lock);
- irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
- clear_dma_irqstat(uart->rx_dma_channel);
-
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
- uart->rx_dma_nrows = 0;
-
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
- if (pos > uart->rx_dma_buf.tail ||
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
- uart->rx_dma_buf.head = pos;
- bfin_serial_dma_rx_chars(uart);
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
- }
-
- spin_unlock(&uart->rx_lock);
-
- return IRQ_HANDLED;
-}
-#endif
-
-/*
- * Return TIOCSER_TEMT when transmitter is not busy.
- */
-static unsigned int bfin_serial_tx_empty(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned int lsr;
-
- lsr = UART_GET_LSR(uart);
- if (lsr & TEMT)
- return TIOCSER_TEMT;
- else
- return 0;
-}
-
-static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- u32 lcr = UART_GET_LCR(uart);
- if (break_state)
- lcr |= SB;
- else
- lcr &= ~SB;
- UART_PUT_LCR(uart, lcr);
- SSYNC();
-}
-
-static int bfin_serial_startup(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- dma_addr_t dma_handle;
-
- if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
- printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
- return -EBUSY;
- }
-
- if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
- printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
- free_dma(uart->rx_dma_channel);
- return -EBUSY;
- }
-
- set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
- set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
-
- uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
- uart->rx_dma_buf.head = 0;
- uart->rx_dma_buf.tail = 0;
- uart->rx_dma_nrows = 0;
-
- set_dma_config(uart->rx_dma_channel,
- set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
- INTR_ON_ROW, DIMENSION_2D,
- DATA_SIZE_8,
- DMA_SYNC_RESTART));
- set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
- set_dma_x_modify(uart->rx_dma_channel, 1);
- set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
- set_dma_y_modify(uart->rx_dma_channel, 1);
- set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
- enable_dma(uart->rx_dma_channel);
-
- uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
- add_timer(&(uart->rx_dma_timer));
-#else
-# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
- kgdboc_break_enabled = 0;
- else {
-# endif
- if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
- "BFIN_UART_RX", uart)) {
- printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
- return -EBUSY;
- }
-
- if (request_irq
- (uart->tx_irq, bfin_serial_tx_int, 0,
- "BFIN_UART_TX", uart)) {
- printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
- free_irq(uart->rx_irq, uart);
- return -EBUSY;
- }
-
-# ifdef CONFIG_BF54x
- {
- /*
- * UART2 and UART3 on BF548 share interrupt PINs and DMA
- * controllers with SPORT2 and SPORT3. UART rx and tx
- * interrupts are generated in PIO mode only when configure
- * their peripheral mapping registers properly, which means
- * request corresponding DMA channels in PIO mode as well.
- */
- unsigned uart_dma_ch_rx, uart_dma_ch_tx;
-
- switch (uart->rx_irq) {
- case IRQ_UART3_RX:
- uart_dma_ch_rx = CH_UART3_RX;
- uart_dma_ch_tx = CH_UART3_TX;
- break;
- case IRQ_UART2_RX:
- uart_dma_ch_rx = CH_UART2_RX;
- uart_dma_ch_tx = CH_UART2_TX;
- break;
- default:
- uart_dma_ch_rx = uart_dma_ch_tx = 0;
- break;
- }
-
- if (uart_dma_ch_rx &&
- request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
- printk(KERN_NOTICE"Fail to attach UART interrupt\n");
- free_irq(uart->rx_irq, uart);
- free_irq(uart->tx_irq, uart);
- return -EBUSY;
- }
- if (uart_dma_ch_tx &&
- request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
- printk(KERN_NOTICE "Fail to attach UART interrupt\n");
- free_dma(uart_dma_ch_rx);
- free_irq(uart->rx_irq, uart);
- free_irq(uart->tx_irq, uart);
- return -EBUSY;
- }
- }
-# endif
-# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- }
-# endif
-#endif
-
-#ifdef SERIAL_BFIN_CTSRTS
- if (uart->cts_pin >= 0) {
- if (request_irq(gpio_to_irq(uart->cts_pin),
- bfin_serial_mctrl_cts_int,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
- 0, "BFIN_UART_CTS", uart)) {
- uart->cts_pin = -1;
- pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
- }
- }
- if (uart->rts_pin >= 0) {
- if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
- pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
- uart->rts_pin = -1;
- } else
- gpio_direction_output(uart->rts_pin, 0);
- }
-#endif
-#ifdef SERIAL_BFIN_HARD_CTSRTS
- if (uart->cts_pin >= 0) {
- if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
- 0, "BFIN_UART_MODEM_STATUS", uart)) {
- uart->cts_pin = -1;
- dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
- }
-
- /* CTS RTS PINs are negative assertive. */
- UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
- UART_SET_IER(uart, EDSSI);
- }
-#endif
-
- UART_SET_IER(uart, ERBFI);
- return 0;
-}
-
-static void bfin_serial_shutdown(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- disable_dma(uart->tx_dma_channel);
- free_dma(uart->tx_dma_channel);
- disable_dma(uart->rx_dma_channel);
- free_dma(uart->rx_dma_channel);
- del_timer(&(uart->rx_dma_timer));
- dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
-#else
-#ifdef CONFIG_BF54x
- switch (uart->port.irq) {
- case IRQ_UART3_RX:
- free_dma(CH_UART3_RX);
- free_dma(CH_UART3_TX);
- break;
- case IRQ_UART2_RX:
- free_dma(CH_UART2_RX);
- free_dma(CH_UART2_TX);
- break;
- default:
- break;
- }
-#endif
- free_irq(uart->rx_irq, uart);
- free_irq(uart->tx_irq, uart);
-#endif
-
-#ifdef SERIAL_BFIN_CTSRTS
- if (uart->cts_pin >= 0)
- free_irq(gpio_to_irq(uart->cts_pin), uart);
- if (uart->rts_pin >= 0)
- gpio_free(uart->rts_pin);
-#endif
-#ifdef SERIAL_BFIN_HARD_CTSRTS
- if (uart->cts_pin >= 0)
- free_irq(uart->status_irq, uart);
-#endif
-}
-
-static void
-bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned long flags;
- unsigned int baud, quot;
- unsigned int ier, lcr = 0;
- unsigned long timeout;
-
-#ifdef SERIAL_BFIN_CTSRTS
- if (old == NULL && uart->cts_pin != -1)
- termios->c_cflag |= CRTSCTS;
- else if (uart->cts_pin == -1)
- termios->c_cflag &= ~CRTSCTS;
-#endif
-
- switch (termios->c_cflag & CSIZE) {
- case CS8:
- lcr = WLS(8);
- break;
- case CS7:
- lcr = WLS(7);
- break;
- case CS6:
- lcr = WLS(6);
- break;
- case CS5:
- lcr = WLS(5);
- break;
- default:
- printk(KERN_ERR "%s: word length not supported\n",
- __func__);
- }
-
- /* Anomaly notes:
- * 05000231 - STOP bit is always set to 1 whatever the user is set.
- */
- if (termios->c_cflag & CSTOPB) {
- if (ANOMALY_05000231)
- printk(KERN_WARNING "STOP bits other than 1 is not "
- "supported in case of anomaly 05000231.\n");
- else
- lcr |= STB;
- }
- if (termios->c_cflag & PARENB)
- lcr |= PEN;
- if (!(termios->c_cflag & PARODD))
- lcr |= EPS;
- if (termios->c_cflag & CMSPAR)
- lcr |= STP;
-
- spin_lock_irqsave(&uart->port.lock, flags);
-
- port->read_status_mask = OE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= (FE | PE);
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
- port->read_status_mask |= BI;
-
- /*
- * Characters to ignore
- */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= FE | PE;
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= BI;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= OE;
- }
-
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
- quot = uart_get_divisor(port, baud);
-
- /* If discipline is not IRDA, apply ANOMALY_05000230 */
- if (termios->c_line != N_IRDA)
- quot -= ANOMALY_05000230;
-
- UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
-
- /* Wait till the transfer buffer is empty */
- timeout = jiffies + msecs_to_jiffies(10);
- while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
- if (time_after(jiffies, timeout)) {
- dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
- break;
- }
-
- /* Disable UART */
- ier = UART_GET_IER(uart);
- UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
- UART_DISABLE_INTS(uart);
-
- /* Set DLAB in LCR to Access CLK */
- UART_SET_DLAB(uart);
-
- UART_PUT_CLK(uart, quot);
- SSYNC();
-
- /* Clear DLAB in LCR to Access THR RBR IER */
- UART_CLEAR_DLAB(uart);
-
- UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
-
- /* Enable UART */
- UART_ENABLE_INTS(uart, ier);
- UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
-
- /* Port speed changed, update the per-port timeout. */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- spin_unlock_irqrestore(&uart->port.lock, flags);
-}
-
-static const char *bfin_serial_type(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
- return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
-}
-
-/*
- * Release the memory region(s) being used by 'port'.
- */
-static void bfin_serial_release_port(struct uart_port *port)
-{
-}
-
-/*
- * Request the memory region(s) being used by 'port'.
- */
-static int bfin_serial_request_port(struct uart_port *port)
-{
- return 0;
-}
-
-/*
- * Configure/autoconfigure the port.
- */
-static void bfin_serial_config_port(struct uart_port *port, int flags)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
- if (flags & UART_CONFIG_TYPE &&
- bfin_serial_request_port(&uart->port) == 0)
- uart->port.type = PORT_BFIN;
-}
-
-/*
- * Verify the new serial_struct (for TIOCSSERIAL).
- * The only change we allow are to the flags and type, and
- * even then only between PORT_BFIN and PORT_UNKNOWN
- */
-static int
-bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- return 0;
-}
-
-/*
- * Enable the IrDA function if tty->ldisc.num is N_IRDA.
- * In other cases, disable IrDA function.
- */
-static void bfin_serial_set_ldisc(struct uart_port *port,
- struct ktermios *termios)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned int val;
-
- switch (termios->c_line) {
- case N_IRDA:
- val = UART_GET_GCTL(uart);
- val |= (UMOD_IRDA | RPOLC);
- UART_PUT_GCTL(uart, val);
- break;
- default:
- val = UART_GET_GCTL(uart);
- val &= ~(UMOD_MASK | RPOLC);
- UART_PUT_GCTL(uart, val);
- }
-}
-
-static void bfin_serial_reset_irda(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned int val;
-
- val = UART_GET_GCTL(uart);
- val &= ~(UMOD_MASK | RPOLC);
- UART_PUT_GCTL(uart, val);
- SSYNC();
- val |= (UMOD_IRDA | RPOLC);
- UART_PUT_GCTL(uart, val);
- SSYNC();
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-/* Anomaly notes:
- * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
- * losing other bits of UART_LSR is not a problem here.
- */
-static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
- while (!(UART_GET_LSR(uart) & THRE))
- cpu_relax();
-
- UART_CLEAR_DLAB(uart);
- UART_PUT_CHAR(uart, (unsigned char)chr);
-}
-
-static int bfin_serial_poll_get_char(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned char chr;
-
- while (!(UART_GET_LSR(uart) & DR))
- cpu_relax();
-
- UART_CLEAR_DLAB(uart);
- chr = UART_GET_CHAR(uart);
-
- return chr;
-}
-#endif
-
-static struct uart_ops bfin_serial_pops = {
- .tx_empty = bfin_serial_tx_empty,
- .set_mctrl = bfin_serial_set_mctrl,
- .get_mctrl = bfin_serial_get_mctrl,
- .stop_tx = bfin_serial_stop_tx,
- .start_tx = bfin_serial_start_tx,
- .stop_rx = bfin_serial_stop_rx,
- .break_ctl = bfin_serial_break_ctl,
- .startup = bfin_serial_startup,
- .shutdown = bfin_serial_shutdown,
- .set_termios = bfin_serial_set_termios,
- .set_ldisc = bfin_serial_set_ldisc,
- .type = bfin_serial_type,
- .release_port = bfin_serial_release_port,
- .request_port = bfin_serial_request_port,
- .config_port = bfin_serial_config_port,
- .verify_port = bfin_serial_verify_port,
-#ifdef CONFIG_CONSOLE_POLL
- .poll_put_char = bfin_serial_poll_put_char,
- .poll_get_char = bfin_serial_poll_get_char,
-#endif
-};
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
-/*
- * If the port was already initialised (eg, by a boot loader),
- * try to determine the current setup.
- */
-static void __init
-bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
- int *parity, int *bits)
-{
- unsigned int status;
-
- status = UART_GET_IER(uart) & (ERBFI | ETBEI);
- if (status == (ERBFI | ETBEI)) {
- /* ok, the port was enabled */
- u32 lcr, clk;
-
- lcr = UART_GET_LCR(uart);
-
- *parity = 'n';
- if (lcr & PEN) {
- if (lcr & EPS)
- *parity = 'e';
- else
- *parity = 'o';
- }
- *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
-
- /* Set DLAB in LCR to Access CLK */
- UART_SET_DLAB(uart);
-
- clk = UART_GET_CLK(uart);
-
- /* Clear DLAB in LCR to Access THR RBR IER */
- UART_CLEAR_DLAB(uart);
-
- *baud = get_sclk() / (16*clk);
- }
- pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
-}
-
-static struct uart_driver bfin_serial_reg;
-
-static void bfin_serial_console_putchar(struct uart_port *port, int ch)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- while (!(UART_GET_LSR(uart) & THRE))
- barrier();
- UART_PUT_CHAR(uart, ch);
-}
-
-#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
- defined (CONFIG_EARLY_PRINTK) */
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
-#define CLASS_BFIN_CONSOLE "bfin-console"
-/*
- * Interrupts are disabled on entering
- */
-static void
-bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
-{
- struct bfin_serial_port *uart = bfin_serial_ports[co->index];
- unsigned long flags;
-
- spin_lock_irqsave(&uart->port.lock, flags);
- uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
- spin_unlock_irqrestore(&uart->port.lock, flags);
-
-}
-
-static int __init
-bfin_serial_console_setup(struct console *co, char *options)
-{
- struct bfin_serial_port *uart;
- int baud = 57600;
- int bits = 8;
- int parity = 'n';
-# if defined(SERIAL_BFIN_CTSRTS) || \
- defined(SERIAL_BFIN_HARD_CTSRTS)
- int flow = 'r';
-# else
- int flow = 'n';
-# endif
-
- /*
- * 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 < 0 || co->index >= BFIN_UART_NR_PORTS)
- return -ENODEV;
-
- uart = bfin_serial_ports[co->index];
- if (!uart)
- return -ENODEV;
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- else
- bfin_serial_console_get_options(uart, &baud, &parity, &bits);
-
- return uart_set_options(&uart->port, co, baud, parity, bits, flow);
-}
-
-static struct console bfin_serial_console = {
- .name = BFIN_SERIAL_DEV_NAME,
- .write = bfin_serial_console_write,
- .device = uart_console_device,
- .setup = bfin_serial_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &bfin_serial_reg,
-};
-#define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
-#else
-#define BFIN_SERIAL_CONSOLE NULL
-#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
-
-#ifdef CONFIG_EARLY_PRINTK
-static struct bfin_serial_port bfin_earlyprintk_port;
-#define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
-
-/*
- * Interrupts are disabled on entering
- */
-static void
-bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
-{
- unsigned long flags;
-
- if (bfin_earlyprintk_port.port.line != co->index)
- return;
-
- spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
- uart_console_write(&bfin_earlyprintk_port.port, s, count,
- bfin_serial_console_putchar);
- spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
-}
-
-/*
- * This should have a .setup or .early_setup in it, but then things get called
- * without the command line options, and the baud rate gets messed up - so
- * don't let the common infrastructure play with things. (see calls to setup
- * & earlysetup in ./kernel/printk.c:register_console()
- */
-static struct console bfin_early_serial_console __initdata = {
- .name = "early_BFuart",
- .write = bfin_earlyprintk_console_write,
- .device = uart_console_device,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &bfin_serial_reg,
-};
-#endif
-
-static struct uart_driver bfin_serial_reg = {
- .owner = THIS_MODULE,
- .driver_name = DRIVER_NAME,
- .dev_name = BFIN_SERIAL_DEV_NAME,
- .major = BFIN_SERIAL_MAJOR,
- .minor = BFIN_SERIAL_MINOR,
- .nr = BFIN_UART_NR_PORTS,
- .cons = BFIN_SERIAL_CONSOLE,
-};
-
-static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- return uart_suspend_port(&bfin_serial_reg, &uart->port);
-}
-
-static int bfin_serial_resume(struct platform_device *pdev)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- return uart_resume_port(&bfin_serial_reg, &uart->port);
-}
-
-static int bfin_serial_probe(struct platform_device *pdev)
-{
- struct resource *res;
- struct bfin_serial_port *uart = NULL;
- int ret = 0;
-
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
- dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
- return -ENOENT;
- }
-
- if (bfin_serial_ports[pdev->id] == NULL) {
-
- uart = kzalloc(sizeof(*uart), GFP_KERNEL);
- if (!uart) {
- dev_err(&pdev->dev,
- "fail to malloc bfin_serial_port\n");
- return -ENOMEM;
- }
- bfin_serial_ports[pdev->id] = uart;
-
-#ifdef CONFIG_EARLY_PRINTK
- if (!(bfin_earlyprintk_port.port.membase
- && bfin_earlyprintk_port.port.line == pdev->id)) {
- /*
- * If the peripheral PINs of current port is allocated
- * in earlyprintk probe stage, don't do it again.
- */
-#endif
- ret = peripheral_request_list(
- dev_get_platdata(&pdev->dev),
- DRIVER_NAME);
- if (ret) {
- dev_err(&pdev->dev,
- "fail to request bfin serial peripherals\n");
- goto out_error_free_mem;
- }
-#ifdef CONFIG_EARLY_PRINTK
- }
-#endif
-
- spin_lock_init(&uart->port.lock);
- uart->port.uartclk = get_sclk();
- uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
- uart->port.ops = &bfin_serial_pops;
- uart->port.line = pdev->id;
- uart->port.iotype = UPIO_MEM;
- uart->port.flags = UPF_BOOT_AUTOCONF;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
- ret = -ENOENT;
- goto out_error_free_peripherals;
- }
-
- uart->port.membase = ioremap(res->start, resource_size(res));
- if (!uart->port.membase) {
- dev_err(&pdev->dev, "Cannot map uart IO\n");
- ret = -ENXIO;
- goto out_error_free_peripherals;
- }
- uart->port.mapbase = res->start;
-
- uart->tx_irq = platform_get_irq(pdev, 0);
- if (uart->tx_irq < 0) {
- dev_err(&pdev->dev, "No uart TX IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-
- uart->rx_irq = platform_get_irq(pdev, 1);
- if (uart->rx_irq < 0) {
- dev_err(&pdev->dev, "No uart RX IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
- uart->port.irq = uart->rx_irq;
-
- uart->status_irq = platform_get_irq(pdev, 2);
- if (uart->status_irq < 0) {
- dev_err(&pdev->dev, "No uart status IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- spin_lock_init(&uart->rx_lock);
- uart->tx_done = 1;
- uart->tx_count = 0;
-
- res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
- uart->tx_dma_channel = res->start;
-
- res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (res == NULL) {
- dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
- uart->rx_dma_channel = res->start;
-
- timer_setup(&uart->rx_dma_timer, bfin_serial_rx_dma_timeout, 0);
-#endif
-
-#if defined(SERIAL_BFIN_CTSRTS) || \
- defined(SERIAL_BFIN_HARD_CTSRTS)
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (res == NULL)
- uart->cts_pin = -1;
- else
- uart->cts_pin = res->start;
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 1);
- if (res == NULL)
- uart->rts_pin = -1;
- else
- uart->rts_pin = res->start;
-#endif
- }
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- if (!is_early_platform_device(pdev)) {
-#endif
- uart = bfin_serial_ports[pdev->id];
- uart->port.dev = &pdev->dev;
- dev_set_drvdata(&pdev->dev, uart);
- ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- }
-#endif
-
- if (!ret)
- return 0;
-
- if (uart) {
-out_error_unmap:
- iounmap(uart->port.membase);
-out_error_free_peripherals:
- peripheral_free_list(dev_get_platdata(&pdev->dev));
-out_error_free_mem:
- kfree(uart);
- bfin_serial_ports[pdev->id] = NULL;
- }
-
- return ret;
-}
-
-static int bfin_serial_remove(struct platform_device *pdev)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- dev_set_drvdata(&pdev->dev, NULL);
-
- if (uart) {
- uart_remove_one_port(&bfin_serial_reg, &uart->port);
- iounmap(uart->port.membase);
- peripheral_free_list(dev_get_platdata(&pdev->dev));
- kfree(uart);
- bfin_serial_ports[pdev->id] = NULL;
- }
-
- return 0;
-}
-
-static struct platform_driver bfin_serial_driver = {
- .probe = bfin_serial_probe,
- .remove = bfin_serial_remove,
- .suspend = bfin_serial_suspend,
- .resume = bfin_serial_resume,
- .driver = {
- .name = DRIVER_NAME,
- },
-};
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
-static struct early_platform_driver early_bfin_serial_driver __initdata = {
- .class_str = CLASS_BFIN_CONSOLE,
- .pdrv = &bfin_serial_driver,
- .requested_id = EARLY_PLATFORM_ID_UNSET,
-};
-
-static int __init bfin_serial_rs_console_init(void)
-{
- early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
-
- early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
-
- register_console(&bfin_serial_console);
-
- return 0;
-}
-console_initcall(bfin_serial_rs_console_init);
-#endif
-
-#ifdef CONFIG_EARLY_PRINTK
-/*
- * Memory can't be allocated dynamically during earlyprink init stage.
- * So, do individual probe for earlyprink with a static uart port variable.
- */
-static int bfin_earlyprintk_probe(struct platform_device *pdev)
-{
- struct resource *res;
- int ret;
-
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
- dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
- return -ENOENT;
- }
-
- ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
- DRIVER_NAME);
- if (ret) {
- dev_err(&pdev->dev,
- "fail to request bfin serial peripherals\n");
- return ret;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
- ret = -ENOENT;
- goto out_error_free_peripherals;
- }
-
- bfin_earlyprintk_port.port.membase = ioremap(res->start,
- resource_size(res));
- if (!bfin_earlyprintk_port.port.membase) {
- dev_err(&pdev->dev, "Cannot map uart IO\n");
- ret = -ENXIO;
- goto out_error_free_peripherals;
- }
- bfin_earlyprintk_port.port.mapbase = res->start;
- bfin_earlyprintk_port.port.line = pdev->id;
- bfin_earlyprintk_port.port.uartclk = get_sclk();
- bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
- spin_lock_init(&bfin_earlyprintk_port.port.lock);
-
- return 0;
-
-out_error_free_peripherals:
- peripheral_free_list(dev_get_platdata(&pdev->dev));
-
- return ret;
-}
-
-static struct platform_driver bfin_earlyprintk_driver = {
- .probe = bfin_earlyprintk_probe,
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
- .class_str = CLASS_BFIN_EARLYPRINTK,
- .pdrv = &bfin_earlyprintk_driver,
- .requested_id = EARLY_PLATFORM_ID_UNSET,
-};
-
-struct console __init *bfin_earlyserial_init(unsigned int port,
- unsigned int cflag)
-{
- struct ktermios t;
- char port_name[20];
-
- if (port < 0 || port >= BFIN_UART_NR_PORTS)
- return NULL;
-
- /*
- * Only probe resource of the given port in earlyprintk boot arg.
- * The expected port id should be indicated in port name string.
- */
- snprintf(port_name, 20, DRIVER_NAME ".%d", port);
- early_platform_driver_register(&early_bfin_earlyprintk_driver,
- port_name);
- early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
-
- if (!bfin_earlyprintk_port.port.membase)
- return NULL;
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- /*
- * If we are using early serial, don't let the normal console rewind
- * log buffer, since that causes things to be printed multiple times
- */
- bfin_serial_console.flags &= ~CON_PRINTBUFFER;
-#endif
-
- bfin_early_serial_console.index = port;
- t.c_cflag = cflag;
- t.c_iflag = 0;
- t.c_oflag = 0;
- t.c_lflag = ICANON;
- t.c_line = port;
- bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
-
- return &bfin_early_serial_console;
-}
-#endif /* CONFIG_EARLY_PRINTK */
-
-static int __init bfin_serial_init(void)
-{
- int ret;
-
- pr_info("Blackfin serial driver\n");
-
- ret = uart_register_driver(&bfin_serial_reg);
- if (ret) {
- pr_err("failed to register %s:%d\n",
- bfin_serial_reg.driver_name, ret);
- }
-
- ret = platform_driver_register(&bfin_serial_driver);
- if (ret) {
- pr_err("fail to register bfin uart\n");
- uart_unregister_driver(&bfin_serial_reg);
- }
-
- return ret;
-}
-
-static void __exit bfin_serial_exit(void)
-{
- platform_driver_unregister(&bfin_serial_driver);
- uart_unregister_driver(&bfin_serial_reg);
-}
-
-
-module_init(bfin_serial_init);
-module_exit(bfin_serial_exit);
-
-MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
-MODULE_DESCRIPTION("Blackfin generic serial port driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
-MODULE_ALIAS("platform:bfin-uart");
projects / linux.git / commitdiff