2015-01-28 19:08:44 +08:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2012-2015 Spreadtrum Communications Inc.
|
|
|
|
*
|
|
|
|
* This software is licensed under the terms of the GNU General Public
|
|
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
|
|
* may be copied, distributed, and modified under those terms.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#if defined(CONFIG_SERIAL_SPRD_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
|
|
|
|
#define SUPPORT_SYSRQ
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <linux/clk.h>
|
|
|
|
#include <linux/console.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/ioport.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/serial_core.h>
|
|
|
|
#include <linux/serial.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/tty.h>
|
|
|
|
#include <linux/tty_flip.h>
|
|
|
|
|
|
|
|
/* device name */
|
|
|
|
#define UART_NR_MAX 8
|
|
|
|
#define SPRD_TTY_NAME "ttyS"
|
|
|
|
#define SPRD_FIFO_SIZE 128
|
|
|
|
#define SPRD_DEF_RATE 26000000
|
|
|
|
#define SPRD_BAUD_IO_LIMIT 3000000
|
|
|
|
#define SPRD_TIMEOUT 256
|
|
|
|
|
|
|
|
/* the offset of serial registers and BITs for them */
|
|
|
|
/* data registers */
|
|
|
|
#define SPRD_TXD 0x0000
|
|
|
|
#define SPRD_RXD 0x0004
|
|
|
|
|
|
|
|
/* line status register and its BITs */
|
|
|
|
#define SPRD_LSR 0x0008
|
|
|
|
#define SPRD_LSR_OE BIT(4)
|
|
|
|
#define SPRD_LSR_FE BIT(3)
|
|
|
|
#define SPRD_LSR_PE BIT(2)
|
|
|
|
#define SPRD_LSR_BI BIT(7)
|
|
|
|
#define SPRD_LSR_TX_OVER BIT(15)
|
|
|
|
|
|
|
|
/* data number in TX and RX fifo */
|
|
|
|
#define SPRD_STS1 0x000C
|
|
|
|
|
|
|
|
/* interrupt enable register and its BITs */
|
|
|
|
#define SPRD_IEN 0x0010
|
|
|
|
#define SPRD_IEN_RX_FULL BIT(0)
|
|
|
|
#define SPRD_IEN_TX_EMPTY BIT(1)
|
|
|
|
#define SPRD_IEN_BREAK_DETECT BIT(7)
|
|
|
|
#define SPRD_IEN_TIMEOUT BIT(13)
|
|
|
|
|
|
|
|
/* interrupt clear register */
|
|
|
|
#define SPRD_ICLR 0x0014
|
|
|
|
|
|
|
|
/* line control register */
|
|
|
|
#define SPRD_LCR 0x0018
|
|
|
|
#define SPRD_LCR_STOP_1BIT 0x10
|
|
|
|
#define SPRD_LCR_STOP_2BIT 0x30
|
|
|
|
#define SPRD_LCR_DATA_LEN (BIT(2) | BIT(3))
|
|
|
|
#define SPRD_LCR_DATA_LEN5 0x0
|
|
|
|
#define SPRD_LCR_DATA_LEN6 0x4
|
|
|
|
#define SPRD_LCR_DATA_LEN7 0x8
|
|
|
|
#define SPRD_LCR_DATA_LEN8 0xc
|
|
|
|
#define SPRD_LCR_PARITY (BIT(0) | BIT(1))
|
|
|
|
#define SPRD_LCR_PARITY_EN 0x2
|
|
|
|
#define SPRD_LCR_EVEN_PAR 0x0
|
|
|
|
#define SPRD_LCR_ODD_PAR 0x1
|
|
|
|
|
|
|
|
/* control register 1 */
|
|
|
|
#define SPRD_CTL1 0x001C
|
|
|
|
#define RX_HW_FLOW_CTL_THLD BIT(6)
|
|
|
|
#define RX_HW_FLOW_CTL_EN BIT(7)
|
|
|
|
#define TX_HW_FLOW_CTL_EN BIT(8)
|
|
|
|
#define RX_TOUT_THLD_DEF 0x3E00
|
|
|
|
#define RX_HFC_THLD_DEF 0x40
|
|
|
|
|
|
|
|
/* fifo threshold register */
|
|
|
|
#define SPRD_CTL2 0x0020
|
|
|
|
#define THLD_TX_EMPTY 0x40
|
|
|
|
#define THLD_RX_FULL 0x40
|
|
|
|
|
|
|
|
/* config baud rate register */
|
|
|
|
#define SPRD_CLKD0 0x0024
|
|
|
|
#define SPRD_CLKD1 0x0028
|
|
|
|
|
|
|
|
/* interrupt mask status register */
|
|
|
|
#define SPRD_IMSR 0x002C
|
|
|
|
#define SPRD_IMSR_RX_FIFO_FULL BIT(0)
|
|
|
|
#define SPRD_IMSR_TX_FIFO_EMPTY BIT(1)
|
|
|
|
#define SPRD_IMSR_BREAK_DETECT BIT(7)
|
|
|
|
#define SPRD_IMSR_TIMEOUT BIT(13)
|
|
|
|
|
|
|
|
struct reg_backup {
|
|
|
|
u32 ien;
|
|
|
|
u32 ctrl0;
|
|
|
|
u32 ctrl1;
|
|
|
|
u32 ctrl2;
|
|
|
|
u32 clkd0;
|
|
|
|
u32 clkd1;
|
|
|
|
u32 dspwait;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct sprd_uart_port {
|
|
|
|
struct uart_port port;
|
|
|
|
struct reg_backup reg_bak;
|
|
|
|
char name[16];
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct sprd_uart_port *sprd_port[UART_NR_MAX];
|
|
|
|
static int sprd_ports_num;
|
|
|
|
|
|
|
|
static inline unsigned int serial_in(struct uart_port *port, int offset)
|
|
|
|
{
|
|
|
|
return readl_relaxed(port->membase + offset);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void serial_out(struct uart_port *port, int offset, int value)
|
|
|
|
{
|
|
|
|
writel_relaxed(value, port->membase + offset);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int sprd_tx_empty(struct uart_port *port)
|
|
|
|
{
|
|
|
|
if (serial_in(port, SPRD_STS1) & 0xff00)
|
|
|
|
return 0;
|
|
|
|
else
|
|
|
|
return TIOCSER_TEMT;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int sprd_get_mctrl(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return TIOCM_DSR | TIOCM_CTS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl)
|
|
|
|
{
|
|
|
|
/* nothing to do */
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_stop_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned int ien, iclr;
|
|
|
|
|
|
|
|
iclr = serial_in(port, SPRD_ICLR);
|
|
|
|
ien = serial_in(port, SPRD_IEN);
|
|
|
|
|
|
|
|
iclr |= SPRD_IEN_TX_EMPTY;
|
|
|
|
ien &= ~SPRD_IEN_TX_EMPTY;
|
|
|
|
|
|
|
|
serial_out(port, SPRD_ICLR, iclr);
|
|
|
|
serial_out(port, SPRD_IEN, ien);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_start_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned int ien;
|
|
|
|
|
|
|
|
ien = serial_in(port, SPRD_IEN);
|
|
|
|
if (!(ien & SPRD_IEN_TX_EMPTY)) {
|
|
|
|
ien |= SPRD_IEN_TX_EMPTY;
|
|
|
|
serial_out(port, SPRD_IEN, ien);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_stop_rx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned int ien, iclr;
|
|
|
|
|
|
|
|
iclr = serial_in(port, SPRD_ICLR);
|
|
|
|
ien = serial_in(port, SPRD_IEN);
|
|
|
|
|
|
|
|
ien &= ~(SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT);
|
|
|
|
iclr |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT;
|
|
|
|
|
|
|
|
serial_out(port, SPRD_IEN, ien);
|
|
|
|
serial_out(port, SPRD_ICLR, iclr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* The Sprd serial does not support this function. */
|
|
|
|
static void sprd_break_ctl(struct uart_port *port, int break_state)
|
|
|
|
{
|
|
|
|
/* nothing to do */
|
|
|
|
}
|
|
|
|
|
|
|
|
static int handle_lsr_errors(struct uart_port *port,
|
|
|
|
unsigned int *flag,
|
|
|
|
unsigned int *lsr)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
/* statistics */
|
|
|
|
if (*lsr & SPRD_LSR_BI) {
|
|
|
|
*lsr &= ~(SPRD_LSR_FE | SPRD_LSR_PE);
|
|
|
|
port->icount.brk++;
|
|
|
|
ret = uart_handle_break(port);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
} else if (*lsr & SPRD_LSR_PE)
|
|
|
|
port->icount.parity++;
|
|
|
|
else if (*lsr & SPRD_LSR_FE)
|
|
|
|
port->icount.frame++;
|
|
|
|
if (*lsr & SPRD_LSR_OE)
|
|
|
|
port->icount.overrun++;
|
|
|
|
|
|
|
|
/* mask off conditions which should be ignored */
|
|
|
|
*lsr &= port->read_status_mask;
|
|
|
|
if (*lsr & SPRD_LSR_BI)
|
|
|
|
*flag = TTY_BREAK;
|
|
|
|
else if (*lsr & SPRD_LSR_PE)
|
|
|
|
*flag = TTY_PARITY;
|
|
|
|
else if (*lsr & SPRD_LSR_FE)
|
|
|
|
*flag = TTY_FRAME;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void sprd_rx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
struct tty_port *tty = &port->state->port;
|
|
|
|
unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
|
|
|
|
|
|
|
|
while ((serial_in(port, SPRD_STS1) & 0x00ff) && max_count--) {
|
|
|
|
lsr = serial_in(port, SPRD_LSR);
|
|
|
|
ch = serial_in(port, SPRD_RXD);
|
|
|
|
flag = TTY_NORMAL;
|
|
|
|
port->icount.rx++;
|
|
|
|
|
|
|
|
if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE |
|
|
|
|
SPRD_LSR_FE | SPRD_LSR_OE))
|
|
|
|
if (handle_lsr_errors(port, &lsr, &flag))
|
|
|
|
continue;
|
|
|
|
if (uart_handle_sysrq_char(port, ch))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
uart_insert_char(port, lsr, SPRD_LSR_OE, ch, flag);
|
|
|
|
}
|
|
|
|
|
|
|
|
tty_flip_buffer_push(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void sprd_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
struct circ_buf *xmit = &port->state->xmit;
|
|
|
|
int count;
|
|
|
|
|
|
|
|
if (port->x_char) {
|
|
|
|
serial_out(port, SPRD_TXD, port->x_char);
|
|
|
|
port->icount.tx++;
|
|
|
|
port->x_char = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
|
|
|
|
sprd_stop_tx(port);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
count = THLD_TX_EMPTY;
|
|
|
|
do {
|
|
|
|
serial_out(port, SPRD_TXD, xmit->buf[xmit->tail]);
|
|
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
|
|
port->icount.tx++;
|
|
|
|
if (uart_circ_empty(xmit))
|
|
|
|
break;
|
|
|
|
} while (--count > 0);
|
|
|
|
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
|
|
uart_write_wakeup(port);
|
|
|
|
|
|
|
|
if (uart_circ_empty(xmit))
|
|
|
|
sprd_stop_tx(port);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* this handles the interrupt from one port */
|
|
|
|
static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct uart_port *port = dev_id;
|
|
|
|
unsigned int ims;
|
|
|
|
|
|
|
|
spin_lock(&port->lock);
|
|
|
|
|
|
|
|
ims = serial_in(port, SPRD_IMSR);
|
|
|
|
|
2015-02-16 22:39:04 +08:00
|
|
|
if (!ims) {
|
|
|
|
spin_unlock(&port->lock);
|
2015-01-28 19:08:44 +08:00
|
|
|
return IRQ_NONE;
|
2015-02-16 22:39:04 +08:00
|
|
|
}
|
2015-01-28 19:08:44 +08:00
|
|
|
|
|
|
|
serial_out(port, SPRD_ICLR, ~0);
|
|
|
|
|
|
|
|
if (ims & (SPRD_IMSR_RX_FIFO_FULL |
|
|
|
|
SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT))
|
|
|
|
sprd_rx(port);
|
|
|
|
|
|
|
|
if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
|
|
|
|
sprd_tx(port);
|
|
|
|
|
|
|
|
spin_unlock(&port->lock);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_startup(struct uart_port *port)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
unsigned int ien, fc;
|
|
|
|
unsigned int timeout;
|
|
|
|
struct sprd_uart_port *sp;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
serial_out(port, SPRD_CTL2, ((THLD_TX_EMPTY << 8) | THLD_RX_FULL));
|
|
|
|
|
|
|
|
/* clear rx fifo */
|
|
|
|
timeout = SPRD_TIMEOUT;
|
|
|
|
while (timeout-- && serial_in(port, SPRD_STS1) & 0x00ff)
|
|
|
|
serial_in(port, SPRD_RXD);
|
|
|
|
|
|
|
|
/* clear tx fifo */
|
|
|
|
timeout = SPRD_TIMEOUT;
|
|
|
|
while (timeout-- && serial_in(port, SPRD_STS1) & 0xff00)
|
|
|
|
cpu_relax();
|
|
|
|
|
|
|
|
/* clear interrupt */
|
|
|
|
serial_out(port, SPRD_IEN, 0);
|
|
|
|
serial_out(port, SPRD_ICLR, ~0);
|
|
|
|
|
|
|
|
/* allocate irq */
|
|
|
|
sp = container_of(port, struct sprd_uart_port, port);
|
|
|
|
snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line);
|
|
|
|
ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq,
|
|
|
|
IRQF_SHARED, sp->name, port);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(port->dev, "fail to request serial irq %d, ret=%d\n",
|
|
|
|
port->irq, ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
fc = serial_in(port, SPRD_CTL1);
|
|
|
|
fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
|
|
|
|
serial_out(port, SPRD_CTL1, fc);
|
|
|
|
|
|
|
|
/* enable interrupt */
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
ien = serial_in(port, SPRD_IEN);
|
|
|
|
ien |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
|
|
|
|
serial_out(port, SPRD_IEN, ien);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_shutdown(struct uart_port *port)
|
|
|
|
{
|
|
|
|
serial_out(port, SPRD_IEN, 0);
|
|
|
|
serial_out(port, SPRD_ICLR, ~0);
|
|
|
|
devm_free_irq(port->dev, port->irq, port);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_set_termios(struct uart_port *port,
|
|
|
|
struct ktermios *termios,
|
|
|
|
struct ktermios *old)
|
|
|
|
{
|
|
|
|
unsigned int baud, quot;
|
|
|
|
unsigned int lcr = 0, fc;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
/* ask the core to calculate the divisor for us */
|
|
|
|
baud = uart_get_baud_rate(port, termios, old, 0, SPRD_BAUD_IO_LIMIT);
|
|
|
|
|
|
|
|
quot = (unsigned int)((port->uartclk + baud / 2) / baud);
|
|
|
|
|
|
|
|
/* set data length */
|
|
|
|
switch (termios->c_cflag & CSIZE) {
|
|
|
|
case CS5:
|
|
|
|
lcr |= SPRD_LCR_DATA_LEN5;
|
|
|
|
break;
|
|
|
|
case CS6:
|
|
|
|
lcr |= SPRD_LCR_DATA_LEN6;
|
|
|
|
break;
|
|
|
|
case CS7:
|
|
|
|
lcr |= SPRD_LCR_DATA_LEN7;
|
|
|
|
break;
|
|
|
|
case CS8:
|
|
|
|
default:
|
|
|
|
lcr |= SPRD_LCR_DATA_LEN8;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* calculate stop bits */
|
|
|
|
lcr &= ~(SPRD_LCR_STOP_1BIT | SPRD_LCR_STOP_2BIT);
|
|
|
|
if (termios->c_cflag & CSTOPB)
|
|
|
|
lcr |= SPRD_LCR_STOP_2BIT;
|
|
|
|
else
|
|
|
|
lcr |= SPRD_LCR_STOP_1BIT;
|
|
|
|
|
|
|
|
/* calculate parity */
|
|
|
|
lcr &= ~SPRD_LCR_PARITY;
|
|
|
|
termios->c_cflag &= ~CMSPAR; /* no support mark/space */
|
|
|
|
if (termios->c_cflag & PARENB) {
|
|
|
|
lcr |= SPRD_LCR_PARITY_EN;
|
|
|
|
if (termios->c_cflag & PARODD)
|
|
|
|
lcr |= SPRD_LCR_ODD_PAR;
|
|
|
|
else
|
|
|
|
lcr |= SPRD_LCR_EVEN_PAR;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
|
|
|
|
/* update the per-port timeout */
|
|
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
|
|
|
|
port->read_status_mask = SPRD_LSR_OE;
|
|
|
|
if (termios->c_iflag & INPCK)
|
|
|
|
port->read_status_mask |= SPRD_LSR_FE | SPRD_LSR_PE;
|
|
|
|
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
|
|
|
|
port->read_status_mask |= SPRD_LSR_BI;
|
|
|
|
|
|
|
|
/* characters to ignore */
|
|
|
|
port->ignore_status_mask = 0;
|
|
|
|
if (termios->c_iflag & IGNPAR)
|
|
|
|
port->ignore_status_mask |= SPRD_LSR_PE | SPRD_LSR_FE;
|
|
|
|
if (termios->c_iflag & IGNBRK) {
|
|
|
|
port->ignore_status_mask |= SPRD_LSR_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 |= SPRD_LSR_OE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* flow control */
|
|
|
|
fc = serial_in(port, SPRD_CTL1);
|
|
|
|
fc &= ~(RX_HW_FLOW_CTL_THLD | RX_HW_FLOW_CTL_EN | TX_HW_FLOW_CTL_EN);
|
|
|
|
if (termios->c_cflag & CRTSCTS) {
|
|
|
|
fc |= RX_HW_FLOW_CTL_THLD;
|
|
|
|
fc |= RX_HW_FLOW_CTL_EN;
|
|
|
|
fc |= TX_HW_FLOW_CTL_EN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* clock divider bit0~bit15 */
|
|
|
|
serial_out(port, SPRD_CLKD0, quot & 0xffff);
|
|
|
|
|
|
|
|
/* clock divider bit16~bit20 */
|
|
|
|
serial_out(port, SPRD_CLKD1, (quot & 0x1f0000) >> 16);
|
|
|
|
serial_out(port, SPRD_LCR, lcr);
|
|
|
|
fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
|
|
|
|
serial_out(port, SPRD_CTL1, fc);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
/* Don't rewrite B0 */
|
|
|
|
if (tty_termios_baud_rate(termios))
|
|
|
|
tty_termios_encode_baud_rate(termios, baud, baud);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const char *sprd_type(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return "SPX";
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_release_port(struct uart_port *port)
|
|
|
|
{
|
|
|
|
/* nothing to do */
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_request_port(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_config_port(struct uart_port *port, int flags)
|
|
|
|
{
|
|
|
|
if (flags & UART_CONFIG_TYPE)
|
|
|
|
port->type = PORT_SPRD;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_verify_port(struct uart_port *port,
|
|
|
|
struct serial_struct *ser)
|
|
|
|
{
|
|
|
|
if (ser->type != PORT_SPRD)
|
|
|
|
return -EINVAL;
|
|
|
|
if (port->irq != ser->irq)
|
|
|
|
return -EINVAL;
|
2015-02-25 01:06:34 +08:00
|
|
|
if (port->iotype != ser->io_type)
|
|
|
|
return -EINVAL;
|
2015-01-28 19:08:44 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct uart_ops serial_sprd_ops = {
|
|
|
|
.tx_empty = sprd_tx_empty,
|
|
|
|
.get_mctrl = sprd_get_mctrl,
|
|
|
|
.set_mctrl = sprd_set_mctrl,
|
|
|
|
.stop_tx = sprd_stop_tx,
|
|
|
|
.start_tx = sprd_start_tx,
|
|
|
|
.stop_rx = sprd_stop_rx,
|
|
|
|
.break_ctl = sprd_break_ctl,
|
|
|
|
.startup = sprd_startup,
|
|
|
|
.shutdown = sprd_shutdown,
|
|
|
|
.set_termios = sprd_set_termios,
|
|
|
|
.type = sprd_type,
|
|
|
|
.release_port = sprd_release_port,
|
|
|
|
.request_port = sprd_request_port,
|
|
|
|
.config_port = sprd_config_port,
|
|
|
|
.verify_port = sprd_verify_port,
|
|
|
|
};
|
|
|
|
|
|
|
|
#ifdef CONFIG_SERIAL_SPRD_CONSOLE
|
|
|
|
static inline void wait_for_xmitr(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned int status, tmout = 10000;
|
|
|
|
|
|
|
|
/* wait up to 10ms for the character(s) to be sent */
|
|
|
|
do {
|
|
|
|
status = serial_in(port, SPRD_STS1);
|
|
|
|
if (--tmout == 0)
|
|
|
|
break;
|
|
|
|
udelay(1);
|
|
|
|
} while (status & 0xff00);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_console_putchar(struct uart_port *port, int ch)
|
|
|
|
{
|
|
|
|
wait_for_xmitr(port);
|
|
|
|
serial_out(port, SPRD_TXD, ch);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_console_write(struct console *co, const char *s,
|
|
|
|
unsigned int count)
|
|
|
|
{
|
|
|
|
struct uart_port *port = &sprd_port[co->index]->port;
|
|
|
|
int locked = 1;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (port->sysrq)
|
|
|
|
locked = 0;
|
|
|
|
else if (oops_in_progress)
|
|
|
|
locked = spin_trylock_irqsave(&port->lock, flags);
|
|
|
|
else
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
|
|
|
|
uart_console_write(port, s, count, sprd_console_putchar);
|
|
|
|
|
|
|
|
/* wait for transmitter to become empty */
|
|
|
|
wait_for_xmitr(port);
|
|
|
|
|
|
|
|
if (locked)
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init sprd_console_setup(struct console *co, char *options)
|
|
|
|
{
|
|
|
|
struct uart_port *port;
|
|
|
|
int baud = 115200;
|
|
|
|
int bits = 8;
|
|
|
|
int parity = 'n';
|
|
|
|
int flow = 'n';
|
|
|
|
|
|
|
|
if (co->index >= UART_NR_MAX || co->index < 0)
|
|
|
|
co->index = 0;
|
|
|
|
|
|
|
|
port = &sprd_port[co->index]->port;
|
|
|
|
if (port == NULL) {
|
|
|
|
pr_info("serial port %d not yet initialized\n", co->index);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
if (options)
|
|
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct uart_driver sprd_uart_driver;
|
|
|
|
static struct console sprd_console = {
|
|
|
|
.name = SPRD_TTY_NAME,
|
|
|
|
.write = sprd_console_write,
|
|
|
|
.device = uart_console_device,
|
|
|
|
.setup = sprd_console_setup,
|
|
|
|
.flags = CON_PRINTBUFFER,
|
|
|
|
.index = -1,
|
|
|
|
.data = &sprd_uart_driver,
|
|
|
|
};
|
|
|
|
|
|
|
|
#define SPRD_CONSOLE (&sprd_console)
|
|
|
|
|
|
|
|
/* Support for earlycon */
|
|
|
|
static void sprd_putc(struct uart_port *port, int c)
|
|
|
|
{
|
|
|
|
unsigned int timeout = SPRD_TIMEOUT;
|
|
|
|
|
|
|
|
while (timeout-- &&
|
|
|
|
!(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER))
|
|
|
|
cpu_relax();
|
|
|
|
|
|
|
|
writeb(c, port->membase + SPRD_TXD);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sprd_early_write(struct console *con, const char *s,
|
|
|
|
unsigned n)
|
|
|
|
{
|
|
|
|
struct earlycon_device *dev = con->data;
|
|
|
|
|
|
|
|
uart_console_write(&dev->port, s, n, sprd_putc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init sprd_early_console_setup(
|
|
|
|
struct earlycon_device *device,
|
|
|
|
const char *opt)
|
|
|
|
{
|
|
|
|
if (!device->port.membase)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
device->con->write = sprd_early_write;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
EARLYCON_DECLARE(sprd_serial, sprd_early_console_setup);
|
|
|
|
OF_EARLYCON_DECLARE(sprd_serial, "sprd,sc9836-uart",
|
|
|
|
sprd_early_console_setup);
|
|
|
|
|
|
|
|
#else /* !CONFIG_SERIAL_SPRD_CONSOLE */
|
|
|
|
#define SPRD_CONSOLE NULL
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct uart_driver sprd_uart_driver = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.driver_name = "sprd_serial",
|
|
|
|
.dev_name = SPRD_TTY_NAME,
|
|
|
|
.major = 0,
|
|
|
|
.minor = 0,
|
|
|
|
.nr = UART_NR_MAX,
|
|
|
|
.cons = SPRD_CONSOLE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int sprd_probe_dt_alias(int index, struct device *dev)
|
|
|
|
{
|
|
|
|
struct device_node *np;
|
|
|
|
int ret = index;
|
|
|
|
|
|
|
|
if (!IS_ENABLED(CONFIG_OF))
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
np = dev->of_node;
|
|
|
|
if (!np)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ret = of_alias_get_id(np, "serial");
|
|
|
|
if (IS_ERR_VALUE(ret))
|
|
|
|
ret = index;
|
|
|
|
else if (ret >= ARRAY_SIZE(sprd_port) || sprd_port[ret] != NULL) {
|
|
|
|
dev_warn(dev, "requested serial port %d not available.\n", ret);
|
|
|
|
ret = index;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_remove(struct platform_device *dev)
|
|
|
|
{
|
|
|
|
struct sprd_uart_port *sup = platform_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (sup) {
|
|
|
|
uart_remove_one_port(&sprd_uart_driver, &sup->port);
|
|
|
|
sprd_port[sup->port.line] = NULL;
|
|
|
|
sprd_ports_num--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!sprd_ports_num)
|
|
|
|
uart_unregister_driver(&sprd_uart_driver);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct resource *res;
|
|
|
|
struct uart_port *up;
|
|
|
|
struct clk *clk;
|
|
|
|
int irq;
|
|
|
|
int index;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
for (index = 0; index < ARRAY_SIZE(sprd_port); index++)
|
|
|
|
if (sprd_port[index] == NULL)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (index == ARRAY_SIZE(sprd_port))
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
index = sprd_probe_dt_alias(index, &pdev->dev);
|
|
|
|
|
|
|
|
sprd_port[index] = devm_kzalloc(&pdev->dev,
|
|
|
|
sizeof(*sprd_port[index]), GFP_KERNEL);
|
|
|
|
if (!sprd_port[index])
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
up = &sprd_port[index]->port;
|
|
|
|
up->dev = &pdev->dev;
|
|
|
|
up->line = index;
|
|
|
|
up->type = PORT_SPRD;
|
2015-02-25 01:06:34 +08:00
|
|
|
up->iotype = UPIO_MEM;
|
2015-01-28 19:08:44 +08:00
|
|
|
up->uartclk = SPRD_DEF_RATE;
|
|
|
|
up->fifosize = SPRD_FIFO_SIZE;
|
|
|
|
up->ops = &serial_sprd_ops;
|
|
|
|
up->flags = UPF_BOOT_AUTOCONF;
|
|
|
|
|
|
|
|
clk = devm_clk_get(&pdev->dev, NULL);
|
|
|
|
if (!IS_ERR(clk))
|
|
|
|
up->uartclk = clk_get_rate(clk);
|
|
|
|
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (!res) {
|
|
|
|
dev_err(&pdev->dev, "not provide mem resource\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
up->mapbase = res->start;
|
|
|
|
up->membase = devm_ioremap_resource(&pdev->dev, res);
|
|
|
|
if (IS_ERR(up->membase))
|
|
|
|
return PTR_ERR(up->membase);
|
|
|
|
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
|
|
if (irq < 0) {
|
|
|
|
dev_err(&pdev->dev, "not provide irq resource\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
up->irq = irq;
|
|
|
|
|
|
|
|
if (!sprd_ports_num) {
|
|
|
|
ret = uart_register_driver(&sprd_uart_driver);
|
|
|
|
if (ret < 0) {
|
|
|
|
pr_err("Failed to register SPRD-UART driver\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sprd_ports_num++;
|
|
|
|
|
|
|
|
ret = uart_add_one_port(&sprd_uart_driver, up);
|
|
|
|
if (ret) {
|
|
|
|
sprd_port[index] = NULL;
|
|
|
|
sprd_remove(pdev);
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, up);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-02-04 04:05:50 +08:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2015-01-28 19:08:44 +08:00
|
|
|
static int sprd_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
struct sprd_uart_port *sup = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
uart_suspend_port(&sprd_uart_driver, &sup->port);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sprd_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
struct sprd_uart_port *sup = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
uart_resume_port(&sprd_uart_driver, &sup->port);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2015-02-04 04:05:50 +08:00
|
|
|
#endif
|
2015-01-28 19:08:44 +08:00
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume);
|
|
|
|
|
|
|
|
static const struct of_device_id serial_ids[] = {
|
|
|
|
{.compatible = "sprd,sc9836-uart",},
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct platform_driver sprd_platform_driver = {
|
|
|
|
.probe = sprd_probe,
|
|
|
|
.remove = sprd_remove,
|
|
|
|
.driver = {
|
|
|
|
.name = "sprd_serial",
|
|
|
|
.of_match_table = of_match_ptr(serial_ids),
|
|
|
|
.pm = &sprd_pm_ops,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(sprd_platform_driver);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_DESCRIPTION("Spreadtrum SoC serial driver series");
|