static int serial_m3110_startup(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config = 0;
int ret = 0;
if (port->line != 0) {
pr_err(PR_FMT "uart port startup failed\n");
return -1;
}
/* Disable all IRQ and config it to 115200, 8n1 */
config = WC_TAG | WC_FIFO_ENABLE
| WC_1_STOPBITS
| WC_8BIT_WORD
| WC_BAUD_DR2;
/* as we use thread to handle tx/rx, need set low latency */
port->state->port.tty->low_latency = 1;
if (max->irq) {
max->read_thread = NULL;
ret = request_irq(max->irq, serial_m3110_irq,
IRQ_TYPE_EDGE_FALLING, "max3110", max);
if (ret) {
max->irq = 0;
pr_err(PR_FMT "unable to allocate IRQ, polling\n");
} else {
/* Enable RX IRQ only */
config |= WC_RXA_IRQ_ENABLE;
}
}
if (max->irq == 0) {
/* If IRQ is disabled, start a read thread for input data */
max->read_thread =
kthread_run(max3110_read_thread, max, "max3110_read");
if (IS_ERR(max->read_thread)) {
ret = PTR_ERR(max->read_thread);
max->read_thread = NULL;
pr_err(PR_FMT "Can't create read thread!\n");
return ret;
}
}
ret = max3110_out(max, config);
if (ret) {
if (max->irq)
free_irq(max->irq, max);
if (max->read_thread)
kthread_stop(max->read_thread);
max->read_thread = NULL;
return ret;
}
max->cur_conf = config;
max->opened = true;
return 0;
}
static int serial_m3110_resume(struct spi_device *spi)
{
struct uart_max3110 *max = spi_get_drvdata(spi);
max3110_out(max, max->cur_conf);
uart_resume_port(&serial_m3110_reg, &max->port);
enable_irq(max->irq);
return 0;
}
static int serial_m3110_suspend(struct spi_device *spi, pm_message_t state)
{
struct uart_max3110 *max = spi_get_drvdata(spi);
disable_irq(max->irq);
uart_suspend_port(&serial_m3110_reg, &max->port);
max3110_out(max, max->cur_conf | WC_SW_SHDI);
return 0;
}
static int serial_m3110_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct uart_max3110 *max = spi_get_drvdata(spi);
if (max->irq > 0)
disable_irq(max->irq);
uart_suspend_port(&serial_m3110_reg, &max->port);
max3110_out(max, max->cur_conf | WC_SW_SHDI);
return 0;
}
static int serial_m3110_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct uart_max3110 *max = spi_get_drvdata(spi);
/* Enable IRQ before max3110 write */
if (max->irq > 0)
enable_irq(max->irq);
max3110_out(max, max->cur_conf);
uart_resume_port(&serial_m3110_reg, &max->port);
return 0;
}
static int serial_m3110_startup(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config = 0;
int ret = 0;
if (port->line != 0)
pr_err(PR_FMT "uart port startup failed\n");
/* firstly disable all IRQ and config it to 115200, 8n1 */
config = WC_TAG | WC_FIFO_ENABLE
| WC_1_STOPBITS
| WC_8BIT_WORD
| WC_BAUD_DR2;
ret = max3110_out(max, config);
/* as we use thread to handle tx/rx, need set low latency */
port->state->port.tty->low_latency = 1;
#ifdef CONFIG_MRST_MAX3110_IRQ
ret = request_irq(max->irq, serial_m3110_irq,
IRQ_TYPE_EDGE_FALLING, "max3110", max);
if (ret)
return ret;
/* enable RX IRQ only */
config |= WC_RXA_IRQ_ENABLE;
max3110_out(max, config);
#else
/* if IRQ is disabled, start a read thread for input data */
max->read_thread =
kthread_run(max3110_read_thread, max, "max3110_read");
#endif
max->cur_conf = config;
return 0;
}
static void serial_m3110_shutdown(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config;
if (max->read_thread) {
kthread_stop(max->read_thread);
max->read_thread = NULL;
}
/* Disable interrupts from this port */
config = WC_TAG | WC_SW_SHDI;
max3110_out(max, config);
}
static void serial_m3110_shutdown(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config;
if (max->read_thread) {
kthread_stop(max->read_thread);
max->read_thread = NULL;
}
#ifdef CONFIG_MRST_MAX3110_IRQ
free_irq(max->irq, max);
#endif
/* Disable interrupts from this port */
config = WC_TAG | WC_SW_SHDI;
max3110_out(max, config);
}
static void
serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
unsigned char cval;
unsigned int baud, parity = 0;
int clk_div = -1;
u16 new_conf = max->cur_conf;
switch (termios->c_cflag & CSIZE) {
case CS7:
cval = UART_LCR_WLEN7;
new_conf |= WC_7BIT_WORD;
break;
default:
case CS8:
cval = UART_LCR_WLEN8;
new_conf |= WC_8BIT_WORD;
break;
}
baud = uart_get_baud_rate(port, termios, old, 0, 230400);
/* first calc the div for 1.8MHZ clock case */
switch (baud) {
case 300:
clk_div = WC_BAUD_DR384;
break;
case 600:
clk_div = WC_BAUD_DR192;
break;
case 1200:
clk_div = WC_BAUD_DR96;
break;
case 2400:
clk_div = WC_BAUD_DR48;
break;
case 4800:
clk_div = WC_BAUD_DR24;
break;
case 9600:
clk_div = WC_BAUD_DR12;
break;
case 19200:
clk_div = WC_BAUD_DR6;
break;
case 38400:
clk_div = WC_BAUD_DR3;
break;
case 57600:
clk_div = WC_BAUD_DR2;
break;
case 115200:
clk_div = WC_BAUD_DR1;
break;
case 230400:
if (max->clock & MAX3110_HIGH_CLK)
break;
default:
/* pick the previous baud rate */
baud = max->baud;
clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
tty_termios_encode_baud_rate(termios, baud, baud);
}
if (max->clock & MAX3110_HIGH_CLK) {
clk_div += 1;
/* high clk version max3110 doesn't support B300 */
if (baud == 300)
baud = 600;
if (baud == 230400)
clk_div = WC_BAUD_DR1;
tty_termios_encode_baud_rate(termios, baud, baud);
}
new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
if (termios->c_cflag & CSTOPB)
new_conf |= WC_2_STOPBITS;
else
new_conf &= ~WC_2_STOPBITS;
if (termios->c_cflag & PARENB) {
new_conf |= WC_PARITY_ENABLE;
parity |= UART_LCR_PARITY;
} else
new_conf &= ~WC_PARITY_ENABLE;
if (!(termios->c_cflag & PARODD))
parity |= UART_LCR_EPAR;
max->parity = parity;
uart_update_timeout(port, termios->c_cflag, baud);
new_conf |= WC_TAG;
if (new_conf != max->cur_conf) {
max3110_out(max, new_conf);
max->cur_conf = new_conf;
max->baud = baud;
}
}
