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WSL2-Linux-Kernel/drivers/serial/sh-sci.c

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/*
* drivers/serial/sh-sci.c
*
* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
*
* Copyright (C) 2002 - 2008 Paul Mundt
* Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
*
* based off of the old drivers/char/sh-sci.c by:
*
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2000 Sugioka Toshinobu
* Modified to support multiple serial ports. Stuart Menefy (May 2000).
* Modified to support SecureEdge. David McCullough (2002)
* Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
* Removed SH7300 support (Jul 2007).
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#undef DEBUG
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/sysrq.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/console.h>
#include <linux/platform_device.h>
#include <linux/serial_sci.h>
#include <linux/notifier.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/list.h>
#ifdef CONFIG_SUPERH
#include <asm/sh_bios.h>
#endif
#ifdef CONFIG_H8300
#include <asm/gpio.h>
#endif
#include "sh-sci.h"
struct sci_port {
struct uart_port port;
/* Port type */
unsigned int type;
/* Port IRQs: ERI, RXI, TXI, BRI (optional) */
unsigned int irqs[SCIx_NR_IRQS];
/* Port enable callback */
void (*enable)(struct uart_port *port);
/* Port disable callback */
void (*disable)(struct uart_port *port);
/* Break timer */
struct timer_list break_timer;
int break_flag;
/* Interface clock */
struct clk *iclk;
/* Data clock */
struct clk *dclk;
struct list_head node;
};
struct sh_sci_priv {
spinlock_t lock;
struct list_head ports;
struct notifier_block clk_nb;
};
/* Function prototypes */
static void sci_stop_tx(struct uart_port *port);
#define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
static struct sci_port sci_ports[SCI_NPORTS];
static struct uart_driver sci_uart_driver;
static inline struct sci_port *
to_sci_port(struct uart_port *uart)
{
return container_of(uart, struct sci_port, port);
}
#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
#ifdef CONFIG_CONSOLE_POLL
static inline void handle_error(struct uart_port *port)
{
/* Clear error flags */
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
}
static int sci_poll_get_char(struct uart_port *port)
{
unsigned short status;
int c;
do {
status = sci_in(port, SCxSR);
if (status & SCxSR_ERRORS(port)) {
handle_error(port);
continue;
}
} while (!(status & SCxSR_RDxF(port)));
c = sci_in(port, SCxRDR);
/* Dummy read */
sci_in(port, SCxSR);
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
return c;
}
#endif
static void sci_poll_put_char(struct uart_port *port, unsigned char c)
{
unsigned short status;
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TDxE(port)));
sci_out(port, SCxTDR, c);
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port));
}
#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
#if defined(__H8300H__) || defined(__H8300S__)
static void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
int ch = (port->mapbase - SMR0) >> 3;
/* set DDR regs */
H8300_GPIO_DDR(h8300_sci_pins[ch].port,
h8300_sci_pins[ch].rx,
H8300_GPIO_INPUT);
H8300_GPIO_DDR(h8300_sci_pins[ch].port,
h8300_sci_pins[ch].tx,
H8300_GPIO_OUTPUT);
/* tx mark output*/
H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
if (port->mapbase == 0xA4400000) {
__raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
__raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
} else if (port->mapbase == 0xA4410000)
__raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
unsigned short data;
if (cflag & CRTSCTS) {
/* enable RTS/CTS */
if (port->mapbase == 0xa4430000) { /* SCIF0 */
/* Clear PTCR bit 9-2; enable all scif pins but sck */
data = __raw_readw(PORT_PTCR);
__raw_writew((data & 0xfc03), PORT_PTCR);
} else if (port->mapbase == 0xa4438000) { /* SCIF1 */
/* Clear PVCR bit 9-2 */
data = __raw_readw(PORT_PVCR);
__raw_writew((data & 0xfc03), PORT_PVCR);
}
} else {
if (port->mapbase == 0xa4430000) { /* SCIF0 */
/* Clear PTCR bit 5-2; enable only tx and rx */
data = __raw_readw(PORT_PTCR);
__raw_writew((data & 0xffc3), PORT_PTCR);
} else if (port->mapbase == 0xa4438000) { /* SCIF1 */
/* Clear PVCR bit 5-2 */
data = __raw_readw(PORT_PVCR);
__raw_writew((data & 0xffc3), PORT_PVCR);
}
}
}
#elif defined(CONFIG_CPU_SH3)
/* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
unsigned short data;
/* We need to set SCPCR to enable RTS/CTS */
data = __raw_readw(SCPCR);
/* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
__raw_writew(data & 0x0fcf, SCPCR);
if (!(cflag & CRTSCTS)) {
/* We need to set SCPCR to enable RTS/CTS */
data = __raw_readw(SCPCR);
/* Clear out SCP7MD1,0, SCP4MD1,0,
Set SCP6MD1,0 = {01} (output) */
__raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
data = __raw_readb(SCPDR);
/* Set /RTS2 (bit6) = 0 */
__raw_writeb(data & 0xbf, SCPDR);
}
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7722)
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
unsigned short data;
if (port->mapbase == 0xffe00000) {
data = __raw_readw(PSCR);
data &= ~0x03cf;
if (!(cflag & CRTSCTS))
data |= 0x0340;
__raw_writew(data, PSCR);
}
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7757) || \
defined(CONFIG_CPU_SUBTYPE_SH7763) || \
defined(CONFIG_CPU_SUBTYPE_SH7780) || \
defined(CONFIG_CPU_SUBTYPE_SH7785) || \
defined(CONFIG_CPU_SUBTYPE_SH7786) || \
defined(CONFIG_CPU_SUBTYPE_SHX3)
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
if (!(cflag & CRTSCTS))
__raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */
}
#elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
if (!(cflag & CRTSCTS))
__raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */
}
#else
static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
{
/* Nothing to do */
}
#endif
#if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
defined(CONFIG_CPU_SUBTYPE_SH7780) || \
defined(CONFIG_CPU_SUBTYPE_SH7785) || \
defined(CONFIG_CPU_SUBTYPE_SH7786)
static inline int scif_txroom(struct uart_port *port)
{
return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
}
static inline int scif_rxroom(struct uart_port *port)
{
return sci_in(port, SCRFDR) & 0xff;
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
static inline int scif_txroom(struct uart_port *port)
{
if ((port->mapbase == 0xffe00000) ||
(port->mapbase == 0xffe08000)) {
/* SCIF0/1*/
return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
} else {
/* SCIF2 */
return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
}
}
static inline int scif_rxroom(struct uart_port *port)
{
if ((port->mapbase == 0xffe00000) ||
(port->mapbase == 0xffe08000)) {
/* SCIF0/1*/
return sci_in(port, SCRFDR) & 0xff;
} else {
/* SCIF2 */
return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
}
}
#else
static inline int scif_txroom(struct uart_port *port)
{
return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
}
static inline int scif_rxroom(struct uart_port *port)
{
return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
}
#endif
static inline int sci_txroom(struct uart_port *port)
{
return (sci_in(port, SCxSR) & SCI_TDRE) != 0;
}
static inline int sci_rxroom(struct uart_port *port)
{
return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
}
/* ********************************************************************** *
* the interrupt related routines *
* ********************************************************************** */
static void sci_transmit_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
unsigned int stopped = uart_tx_stopped(port);
unsigned short status;
unsigned short ctrl;
int count;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_TDxE(port))) {
ctrl = sci_in(port, SCSCR);
if (uart_circ_empty(xmit))
ctrl &= ~SCI_CTRL_FLAGS_TIE;
else
ctrl |= SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
return;
}
if (port->type == PORT_SCI)
count = sci_txroom(port);
else
count = scif_txroom(port);
do {
unsigned char c;
if (port->x_char) {
c = port->x_char;
port->x_char = 0;
} else if (!uart_circ_empty(xmit) && !stopped) {
c = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
} else {
break;
}
sci_out(port, SCxTDR, c);
port->icount.tx++;
} while (--count > 0);
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit)) {
sci_stop_tx(port);
} else {
ctrl = sci_in(port, SCSCR);
if (port->type != PORT_SCI) {
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
}
ctrl |= SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
}
}
/* On SH3, SCIF may read end-of-break as a space->mark char */
#define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); })
static inline void sci_receive_chars(struct uart_port *port)
{
struct sci_port *sci_port = to_sci_port(port);
struct tty_struct *tty = port->state->port.tty;
int i, count, copied = 0;
unsigned short status;
unsigned char flag;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_RDxF(port)))
return;
while (1) {
if (port->type == PORT_SCI)
count = sci_rxroom(port);
else
count = scif_rxroom(port);
/* Don't copy more bytes than there is room for in the buffer */
count = tty_buffer_request_room(tty, count);
/* If for any reason we can't copy more data, we're done! */
if (count == 0)
break;
if (port->type == PORT_SCI) {
char c = sci_in(port, SCxRDR);
if (uart_handle_sysrq_char(port, c) ||
sci_port->break_flag)
count = 0;
else
tty_insert_flip_char(tty, c, TTY_NORMAL);
} else {
for (i = 0; i < count; i++) {
char c = sci_in(port, SCxRDR);
status = sci_in(port, SCxSR);
#if defined(CONFIG_CPU_SH3)
/* Skip "chars" during break */
if (sci_port->break_flag) {
if ((c == 0) &&
(status & SCxSR_FER(port))) {
count--; i--;
continue;
}
/* Nonzero => end-of-break */
dev_dbg(port->dev, "debounce<%02x>\n", c);
sci_port->break_flag = 0;
if (STEPFN(c)) {
count--; i--;
continue;
}
}
#endif /* CONFIG_CPU_SH3 */
if (uart_handle_sysrq_char(port, c)) {
count--; i--;
continue;
}
/* Store data and status */
if (status&SCxSR_FER(port)) {
flag = TTY_FRAME;
dev_notice(port->dev, "frame error\n");
} else if (status&SCxSR_PER(port)) {
flag = TTY_PARITY;
dev_notice(port->dev, "parity error\n");
} else
flag = TTY_NORMAL;
tty_insert_flip_char(tty, c, flag);
}
}
sci_in(port, SCxSR); /* dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
copied += count;
port->icount.rx += count;
}
if (copied) {
/* Tell the rest of the system the news. New characters! */
tty_flip_buffer_push(tty);
} else {
sci_in(port, SCxSR); /* dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
}
}
#define SCI_BREAK_JIFFIES (HZ/20)
/* The sci generates interrupts during the break,
* 1 per millisecond or so during the break period, for 9600 baud.
* So dont bother disabling interrupts.
* But dont want more than 1 break event.
* Use a kernel timer to periodically poll the rx line until
* the break is finished.
*/
static void sci_schedule_break_timer(struct sci_port *port)
{
port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
add_timer(&port->break_timer);
}
/* Ensure that two consecutive samples find the break over. */
static void sci_break_timer(unsigned long data)
{
struct sci_port *port = (struct sci_port *)data;
if (sci_rxd_in(&port->port) == 0) {
port->break_flag = 1;
sci_schedule_break_timer(port);
} else if (port->break_flag == 1) {
/* break is over. */
port->break_flag = 2;
sci_schedule_break_timer(port);
} else
port->break_flag = 0;
}
static inline int sci_handle_errors(struct uart_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->state->port.tty;
if (status & SCxSR_ORER(port)) {
/* overrun error */
if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
copied++;
dev_notice(port->dev, "overrun error");
}
if (status & SCxSR_FER(port)) {
if (sci_rxd_in(port) == 0) {
/* Notify of BREAK */
struct sci_port *sci_port = to_sci_port(port);
if (!sci_port->break_flag) {
sci_port->break_flag = 1;
sci_schedule_break_timer(sci_port);
/* Do sysrq handling. */
if (uart_handle_break(port))
return 0;
dev_dbg(port->dev, "BREAK detected\n");
if (tty_insert_flip_char(tty, 0, TTY_BREAK))
copied++;
}
} else {
/* frame error */
if (tty_insert_flip_char(tty, 0, TTY_FRAME))
copied++;
dev_notice(port->dev, "frame error\n");
}
}
if (status & SCxSR_PER(port)) {
/* parity error */
if (tty_insert_flip_char(tty, 0, TTY_PARITY))
copied++;
dev_notice(port->dev, "parity error");
}
if (copied)
tty_flip_buffer_push(tty);
return copied;
}
static inline int sci_handle_fifo_overrun(struct uart_port *port)
{
struct tty_struct *tty = port->state->port.tty;
int copied = 0;
if (port->type != PORT_SCIF)
return 0;
if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
sci_out(port, SCLSR, 0);
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
tty_flip_buffer_push(tty);
dev_notice(port->dev, "overrun error\n");
copied++;
}
return copied;
}
static inline int sci_handle_breaks(struct uart_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->state->port.tty;
struct sci_port *s = to_sci_port(port);
if (uart_handle_break(port))
return 0;
if (!s->break_flag && status & SCxSR_BRK(port)) {
#if defined(CONFIG_CPU_SH3)
/* Debounce break */
s->break_flag = 1;
#endif
/* Notify of BREAK */
if (tty_insert_flip_char(tty, 0, TTY_BREAK))
copied++;
dev_dbg(port->dev, "BREAK detected\n");
}
if (copied)
tty_flip_buffer_push(tty);
copied += sci_handle_fifo_overrun(port);
return copied;
}
static irqreturn_t sci_rx_interrupt(int irq, void *port)
{
/* I think sci_receive_chars has to be called irrespective
* of whether the I_IXOFF is set, otherwise, how is the interrupt
* to be disabled?
*/
sci_receive_chars(port);
return IRQ_HANDLED;
}
static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
sci_transmit_chars(port);
spin_unlock_irqrestore(&port->lock, flags);
return IRQ_HANDLED;
}
static irqreturn_t sci_er_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
/* Handle errors */
if (port->type == PORT_SCI) {
if (sci_handle_errors(port)) {
/* discard character in rx buffer */
sci_in(port, SCxSR);
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
}
} else {
sci_handle_fifo_overrun(port);
sci_rx_interrupt(irq, ptr);
}
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
/* Kick the transmission */
sci_tx_interrupt(irq, ptr);
return IRQ_HANDLED;
}
static irqreturn_t sci_br_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
/* Handle BREAKs */
sci_handle_breaks(port);
sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
return IRQ_HANDLED;
}
static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
{
unsigned short ssr_status, scr_status, err_enabled;
struct uart_port *port = ptr;
irqreturn_t ret = IRQ_NONE;
ssr_status = sci_in(port, SCxSR);
scr_status = sci_in(port, SCSCR);
err_enabled = scr_status & (SCI_CTRL_FLAGS_REIE | SCI_CTRL_FLAGS_RIE);
/* Tx Interrupt */
if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCI_CTRL_FLAGS_TIE))
ret = sci_tx_interrupt(irq, ptr);
/* Rx Interrupt */
if ((ssr_status & SCxSR_RDxF(port)) && (scr_status & SCI_CTRL_FLAGS_RIE))
ret = sci_rx_interrupt(irq, ptr);
/* Error Interrupt */
if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled)
ret = sci_er_interrupt(irq, ptr);
/* Break Interrupt */
if ((ssr_status & SCxSR_BRK(port)) && err_enabled)
ret = sci_br_interrupt(irq, ptr);
return ret;
}
/*
* Here we define a transistion notifier so that we can update all of our
* ports' baud rate when the peripheral clock changes.
*/
static int sci_notifier(struct notifier_block *self,
unsigned long phase, void *p)
{
struct sh_sci_priv *priv = container_of(self,
struct sh_sci_priv, clk_nb);
struct sci_port *sci_port;
unsigned long flags;
if ((phase == CPUFREQ_POSTCHANGE) ||
(phase == CPUFREQ_RESUMECHANGE)) {
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry(sci_port, &priv->ports, node)
sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
spin_unlock_irqrestore(&priv->lock, flags);
}
return NOTIFY_OK;
}
static void sci_clk_enable(struct uart_port *port)
{
struct sci_port *sci_port = to_sci_port(port);
clk_enable(sci_port->dclk);
sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
if (sci_port->iclk)
clk_enable(sci_port->iclk);
}
static void sci_clk_disable(struct uart_port *port)
{
struct sci_port *sci_port = to_sci_port(port);
if (sci_port->iclk)
clk_disable(sci_port->iclk);
clk_disable(sci_port->dclk);
}
static int sci_request_irq(struct sci_port *port)
{
int i;
irqreturn_t (*handlers[4])(int irq, void *ptr) = {
sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
sci_br_interrupt,
};
const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
"SCI Transmit Data Empty", "SCI Break" };
if (port->irqs[0] == port->irqs[1]) {
if (unlikely(!port->irqs[0]))
return -ENODEV;
if (request_irq(port->irqs[0], sci_mpxed_interrupt,
IRQF_DISABLED, "sci", port)) {
dev_err(port->port.dev, "Can't allocate IRQ\n");
return -ENODEV;
}
} else {
for (i = 0; i < ARRAY_SIZE(handlers); i++) {
if (unlikely(!port->irqs[i]))
continue;
if (request_irq(port->irqs[i], handlers[i],
IRQF_DISABLED, desc[i], port)) {
dev_err(port->port.dev, "Can't allocate IRQ\n");
return -ENODEV;
}
}
}
return 0;
}
static void sci_free_irq(struct sci_port *port)
{
int i;
if (port->irqs[0] == port->irqs[1])
free_irq(port->irqs[0], port);
else {
for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
if (!port->irqs[i])
continue;
free_irq(port->irqs[i], port);
}
}
}
static unsigned int sci_tx_empty(struct uart_port *port)
{
unsigned short status = sci_in(port, SCxSR);
return status & SCxSR_TEND(port) ? TIOCSER_TEMT : 0;
}
static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
/* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
/* If you have signals for DTR and DCD, please implement here. */
}
static unsigned int sci_get_mctrl(struct uart_port *port)
{
/* This routine is used for geting signals of: DTR, DCD, DSR, RI,
and CTS/RTS */
return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
}
static void sci_start_tx(struct uart_port *port)
{
unsigned short ctrl;
/* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
ctrl = sci_in(port, SCSCR);
ctrl |= SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
}
static void sci_stop_tx(struct uart_port *port)
{
unsigned short ctrl;
/* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
ctrl = sci_in(port, SCSCR);
ctrl &= ~SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
}
static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
{
unsigned short ctrl;
/* Set RIE (Receive Interrupt Enable) bit in SCSCR */
ctrl = sci_in(port, SCSCR);
ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
sci_out(port, SCSCR, ctrl);
}
static void sci_stop_rx(struct uart_port *port)
{
unsigned short ctrl;
/* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
ctrl = sci_in(port, SCSCR);
ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
sci_out(port, SCSCR, ctrl);
}
static void sci_enable_ms(struct uart_port *port)
{
/* Nothing here yet .. */
}
static void sci_break_ctl(struct uart_port *port, int break_state)
{
/* Nothing here yet .. */
}
static int sci_startup(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
if (s->enable)
s->enable(port);
sci_request_irq(s);
sci_start_tx(port);
sci_start_rx(port, 1);
return 0;
}
static void sci_shutdown(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
sci_stop_rx(port);
sci_stop_tx(port);
sci_free_irq(s);
if (s->disable)
s->disable(port);
}
static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
unsigned int status, baud, smr_val, max_baud;
int t = -1;
/*
* earlyprintk comes here early on with port->uartclk set to zero.
* the clock framework is not up and running at this point so here
* we assume that 115200 is the maximum baud rate. please note that
* the baud rate is not programmed during earlyprintk - it is assumed
* that the previous boot loader has enabled required clocks and
* setup the baud rate generator hardware for us already.
*/
max_baud = port->uartclk ? port->uartclk / 16 : 115200;
baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
if (likely(baud && port->uartclk))
t = SCBRR_VALUE(baud, port->uartclk);
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TEND(port)));
sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
if (port->type != PORT_SCI)
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
smr_val = sci_in(port, SCSMR) & 3;
if ((termios->c_cflag & CSIZE) == CS7)
smr_val |= 0x40;
if (termios->c_cflag & PARENB)
smr_val |= 0x20;
if (termios->c_cflag & PARODD)
smr_val |= 0x30;
if (termios->c_cflag & CSTOPB)
smr_val |= 0x08;
uart_update_timeout(port, termios->c_cflag, baud);
sci_out(port, SCSMR, smr_val);
if (t > 0) {
if (t >= 256) {
sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
t >>= 2;
} else
sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
sci_out(port, SCBRR, t);
udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
}
sci_init_pins(port, termios->c_cflag);
sci_out(port, SCFCR, (termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0);
sci_out(port, SCSCR, SCSCR_INIT(port));
if ((termios->c_cflag & CREAD) != 0)
sci_start_rx(port, 0);
}
static const char *sci_type(struct uart_port *port)
{
switch (port->type) {
case PORT_IRDA:
return "irda";
case PORT_SCI:
return "sci";
case PORT_SCIF:
return "scif";
case PORT_SCIFA:
return "scifa";
}
return NULL;
}
static void sci_release_port(struct uart_port *port)
{
/* Nothing here yet .. */
}
static int sci_request_port(struct uart_port *port)
{
/* Nothing here yet .. */
return 0;
}
static void sci_config_port(struct uart_port *port, int flags)
{
struct sci_port *s = to_sci_port(port);
port->type = s->type;
if (port->membase)
return;
if (port->flags & UPF_IOREMAP) {
port->membase = ioremap_nocache(port->mapbase, 0x40);
if (IS_ERR(port->membase))
dev_err(port->dev, "can't remap port#%d\n", port->line);
} else {
/*
* For the simple (and majority of) cases where we don't
* need to do any remapping, just cast the cookie
* directly.
*/
port->membase = (void __iomem *)port->mapbase;
}
}
static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
{
struct sci_port *s = to_sci_port(port);
if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
return -EINVAL;
if (ser->baud_base < 2400)
/* No paper tape reader for Mitch.. */
return -EINVAL;
return 0;
}
static struct uart_ops sci_uart_ops = {
.tx_empty = sci_tx_empty,
.set_mctrl = sci_set_mctrl,
.get_mctrl = sci_get_mctrl,
.start_tx = sci_start_tx,
.stop_tx = sci_stop_tx,
.stop_rx = sci_stop_rx,
.enable_ms = sci_enable_ms,
.break_ctl = sci_break_ctl,
.startup = sci_startup,
.shutdown = sci_shutdown,
.set_termios = sci_set_termios,
.type = sci_type,
.release_port = sci_release_port,
.request_port = sci_request_port,
.config_port = sci_config_port,
.verify_port = sci_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = sci_poll_get_char,
.poll_put_char = sci_poll_put_char,
#endif
};
static void __devinit sci_init_single(struct platform_device *dev,
struct sci_port *sci_port,
unsigned int index,
struct plat_sci_port *p)
{
sci_port->port.ops = &sci_uart_ops;
sci_port->port.iotype = UPIO_MEM;
sci_port->port.line = index;
switch (p->type) {
case PORT_SCIFA:
sci_port->port.fifosize = 64;
break;
case PORT_SCIF:
sci_port->port.fifosize = 16;
break;
default:
sci_port->port.fifosize = 1;
break;
}
if (dev) {
sci_port->iclk = p->clk ? clk_get(&dev->dev, p->clk) : NULL;
sci_port->dclk = clk_get(&dev->dev, "peripheral_clk");
sci_port->enable = sci_clk_enable;
sci_port->disable = sci_clk_disable;
sci_port->port.dev = &dev->dev;
}
sci_port->break_timer.data = (unsigned long)sci_port;
sci_port->break_timer.function = sci_break_timer;
init_timer(&sci_port->break_timer);
sci_port->port.mapbase = p->mapbase;
sci_port->port.membase = p->membase;
sci_port->port.irq = p->irqs[SCIx_TXI_IRQ];
sci_port->port.flags = p->flags;
sci_port->type = sci_port->port.type = p->type;
memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs));
}
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
static struct tty_driver *serial_console_device(struct console *co, int *index)
{
struct uart_driver *p = &sci_uart_driver;
*index = co->index;
return p->tty_driver;
}
static void serial_console_putchar(struct uart_port *port, int ch)
{
sci_poll_put_char(port, ch);
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*/
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
struct uart_port *port = co->data;
struct sci_port *sci_port = to_sci_port(port);
unsigned short bits;
if (sci_port->enable)
sci_port->enable(port);
uart_console_write(port, s, count, serial_console_putchar);
/* wait until fifo is empty and last bit has been transmitted */
bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
while ((sci_in(port, SCxSR) & bits) != bits)
cpu_relax();
if (sci_port->disable)
sci_port->disable(port);
}
static int __devinit serial_console_setup(struct console *co, char *options)
{
struct sci_port *sci_port;
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
/*
* 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 >= SCI_NPORTS)
co->index = 0;
if (co->data) {
port = co->data;
sci_port = to_sci_port(port);
} else {
sci_port = &sci_ports[co->index];
port = &sci_port->port;
co->data = port;
}
/*
* Also need to check port->type, we don't actually have any
* UPIO_PORT ports, but uart_report_port() handily misreports
* it anyways if we don't have a port available by the time this is
* called.
*/
if (!port->type)
return -ENODEV;
sci_config_port(port, 0);
if (sci_port->enable)
sci_port->enable(port);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
ret = uart_set_options(port, co, baud, parity, bits, flow);
#if defined(__H8300H__) || defined(__H8300S__)
/* disable rx interrupt */
if (ret == 0)
sci_stop_rx(port);
#endif
/* TODO: disable clock */
return ret;
}
static struct console serial_console = {
.name = "ttySC",
.device = serial_console_device,
.write = serial_console_write,
.setup = serial_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
static int __init sci_console_init(void)
{
register_console(&serial_console);
return 0;
}
console_initcall(sci_console_init);
static struct sci_port early_serial_port;
static struct console early_serial_console = {
.name = "early_ttySC",
.write = serial_console_write,
.flags = CON_PRINTBUFFER,
};
static char early_serial_buf[32];
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
#define SCI_CONSOLE (&serial_console)
#else
#define SCI_CONSOLE 0
#endif
static char banner[] __initdata =
KERN_INFO "SuperH SCI(F) driver initialized\n";
static struct uart_driver sci_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "sci",
.dev_name = "ttySC",
.major = SCI_MAJOR,
.minor = SCI_MINOR_START,
.nr = SCI_NPORTS,
.cons = SCI_CONSOLE,
};
static int sci_remove(struct platform_device *dev)
{
struct sh_sci_priv *priv = platform_get_drvdata(dev);
struct sci_port *p;
unsigned long flags;
cpufreq_unregister_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER);
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry(p, &priv->ports, node)
uart_remove_one_port(&sci_uart_driver, &p->port);
spin_unlock_irqrestore(&priv->lock, flags);
kfree(priv);
return 0;
}
static int __devinit sci_probe_single(struct platform_device *dev,
unsigned int index,
struct plat_sci_port *p,
struct sci_port *sciport)
{
struct sh_sci_priv *priv = platform_get_drvdata(dev);
unsigned long flags;
int ret;
/* Sanity check */
if (unlikely(index >= SCI_NPORTS)) {
dev_notice(&dev->dev, "Attempting to register port "
"%d when only %d are available.\n",
index+1, SCI_NPORTS);
dev_notice(&dev->dev, "Consider bumping "
"CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
return 0;
}
sci_init_single(dev, sciport, index, p);
ret = uart_add_one_port(&sci_uart_driver, &sciport->port);
if (ret)
return ret;
INIT_LIST_HEAD(&sciport->node);
spin_lock_irqsave(&priv->lock, flags);
list_add(&sciport->node, &priv->ports);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
/*
* Register a set of serial devices attached to a platform device. The
* list is terminated with a zero flags entry, which means we expect
* all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
* remapping (such as sh64) should also set UPF_IOREMAP.
*/
static int __devinit sci_probe(struct platform_device *dev)
{
struct plat_sci_port *p = dev->dev.platform_data;
struct sh_sci_priv *priv;
int i, ret = -EINVAL;
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
if (is_early_platform_device(dev)) {
if (dev->id == -1)
return -ENOTSUPP;
early_serial_console.index = dev->id;
early_serial_console.data = &early_serial_port.port;
sci_init_single(NULL, &early_serial_port, dev->id, p);
serial_console_setup(&early_serial_console, early_serial_buf);
if (!strstr(early_serial_buf, "keep"))
early_serial_console.flags |= CON_BOOT;
register_console(&early_serial_console);
return 0;
}
#endif
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
INIT_LIST_HEAD(&priv->ports);
spin_lock_init(&priv->lock);
platform_set_drvdata(dev, priv);
priv->clk_nb.notifier_call = sci_notifier;
cpufreq_register_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER);
if (dev->id != -1) {
ret = sci_probe_single(dev, dev->id, p, &sci_ports[dev->id]);
if (ret)
goto err_unreg;
} else {
for (i = 0; p && p->flags != 0; p++, i++) {
ret = sci_probe_single(dev, i, p, &sci_ports[i]);
if (ret)
goto err_unreg;
}
}
#ifdef CONFIG_SH_STANDARD_BIOS
sh_bios_gdb_detach();
#endif
return 0;
err_unreg:
sci_remove(dev);
return ret;
}
static int sci_suspend(struct device *dev)
{
struct sh_sci_priv *priv = dev_get_drvdata(dev);
struct sci_port *p;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry(p, &priv->ports, node)
uart_suspend_port(&sci_uart_driver, &p->port);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int sci_resume(struct device *dev)
{
struct sh_sci_priv *priv = dev_get_drvdata(dev);
struct sci_port *p;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry(p, &priv->ports, node)
uart_resume_port(&sci_uart_driver, &p->port);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static const struct dev_pm_ops sci_dev_pm_ops = {
.suspend = sci_suspend,
.resume = sci_resume,
};
static struct platform_driver sci_driver = {
.probe = sci_probe,
.remove = sci_remove,
.driver = {
.name = "sh-sci",
.owner = THIS_MODULE,
.pm = &sci_dev_pm_ops,
},
};
static int __init sci_init(void)
{
int ret;
printk(banner);
ret = uart_register_driver(&sci_uart_driver);
if (likely(ret == 0)) {
ret = platform_driver_register(&sci_driver);
if (unlikely(ret))
uart_unregister_driver(&sci_uart_driver);
}
return ret;
}
static void __exit sci_exit(void)
{
platform_driver_unregister(&sci_driver);
uart_unregister_driver(&sci_uart_driver);
}
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
early_platform_init_buffer("earlyprintk", &sci_driver,
early_serial_buf, ARRAY_SIZE(early_serial_buf));
#endif
module_init(sci_init);
module_exit(sci_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sh-sci");
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