static int
serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
{
struct uart_omap_port *up = platform_get_drvdata(pdev);
struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
static unsigned int fifo_suspendbrks;
u8 lcr, efr;
/* Reset the uart wakeup event */
omap_up_info->uart_wakeup_event = 0;
/* Disable interrupts from this port */
serial_out(up, UART_IER, 0);
/* If we're using auto-rts then disable it. */
lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, 0xbf);
efr = serial_in(up, UART_EFR);
serial_out(up, UART_LCR, lcr);
if (efr & UART_EFR_RTS) {
serial_omap_set_autorts(up, 0);
up->restore_autorts = 1;
/*
* Force RTS output to inactive (high) after disable autorts
* mode. This RTS bit might not be restored when enable autorts
* next time, since the RTS output controlled by hardware
* flow control.
*/
serial_omap_set_mctrl(&up->port, (up->port.mctrl & ~TIOCM_RTS));
}
/*
* There seems to be a window here where
* data could still be on the way to the
* fifo. This delay is ~1 byte time @ 115.2k
*/
udelay(80);
if (omap_uart_active(up->port.line, 0)) {
fifo_suspendbrks++;
printk(KERN_WARNING "UART%d FIFO break suspend %d\n",
up->port.line, fifo_suspendbrks);
if (up->restore_autorts) {
up->restore_autorts = 0;
serial_omap_set_autorts(up, 1);
}
serial_out(up, UART_IER, up->ier);
return -EBUSY;
}
serial_out(up, UART_IER, up->ier);
if (up)
uart_suspend_port(&serial_omap_reg, &up->port);
return 0;
}
static void serial_omap_shutdown(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
unsigned long flags = 0;
u8 lcr, efr;
dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
/*
* Disable interrupts from this port
*/
up->ier = 0;
serial_out(up, UART_IER, 0);
/* If we're using auto-rts then disable it. */
spin_lock_irqsave(&up->port.lock, flags);
lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, 0xbf);
efr = serial_in(up, UART_EFR);
serial_out(up, UART_LCR, lcr);
if (efr & UART_EFR_RTS) {
serial_omap_set_autorts(up, 0);
up->restore_autorts = 1;
}
up->port.mctrl &= ~TIOCM_OUT2;
serial_omap_set_mctrl(&up->port, (up->port.mctrl & ~TIOCM_RTS));
spin_unlock_irqrestore(&up->port.lock, flags);
/*
* Disable break condition and FIFOs
*/
serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
serial_omap_clear_fifos(up);
/*
* Read data port to reset things, and then free the irq
*/
if (serial_in(up, UART_LSR) & UART_LSR_DR)
(void) serial_in(up, UART_RX);
if (up->use_dma) {
int tmp;
dma_free_coherent(up->port.dev,
UART_XMIT_SIZE, up->port.state->xmit.buf,
up->uart_dma.tx_buf_dma_phys);
up->port.state->xmit.buf = NULL;
serial_omap_stop_rx(port);
dma_free_coherent(up->port.dev,
up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
up->uart_dma.rx_buf_dma_phys);
up->uart_dma.rx_buf = NULL;
tmp = serial_in(up, UART_OMAP_SYSC) & OMAP_UART_SYSC_RESET;
serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
}
free_irq(up->port.irq, up);
}
static void serial_omap_shutdown(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
unsigned long flags;
u8 lcr, efr;
DPRINTK("serial_omap_shutdown+%d\n", up->pdev->id);
/*
* If we're using auto-rts then disable it.
*/
lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, 0xbf);
efr = serial_in(up, UART_EFR);
serial_out(up, UART_LCR, lcr);
if (efr & UART_EFR_RTS) {
serial_omap_set_autorts(up, 0);
up->restore_autorts = 1;
}
/*
* Disable interrupts from this port
*/
up->ier = 0;
serial_out(up, UART_IER, 0);
spin_lock_irqsave(&up->port.lock, flags);
if (up->port.flags & UPF_FOURPORT) {
/* reset interrupts on the AST Fourport board */
inb((up->port.iobase & 0xfe0) | 0x1f);
up->port.mctrl |= TIOCM_OUT1;
} else
up->port.mctrl &= ~TIOCM_OUT2;
serial_omap_set_mctrl(&up->port, (up->port.mctrl & ~TIOCM_RTS));
spin_unlock_irqrestore(&up->port.lock, flags);
if (up->pdev->id == gps_port) {
serial_out(up, UART_LCR, UART_LCR_DLAB);
serial_out(up, UART_DLL, 0);
serial_out(up, UART_DLM, 0);
serial_out(up, UART_LCR, 0);
serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
}
/*
* Disable break condition and FIFOs
*/
serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
serial_omap_clear_fifos(up);
/*
* Read data port to reset things, and then free the irq
*/
if (serial_in(up, UART_LSR) & UART_LSR_DR)
(void) serial_in(up, UART_RX);
if (up->use_dma) {
int tmp;
if (up->is_buf_dma_alloced) {
dma_free_coherent(up->port.dev,
UART_XMIT_SIZE,
up->port.state->xmit.buf,
up->uart_dma.tx_buf_dma_phys);
up->port.state->xmit.buf = NULL;
up->is_buf_dma_alloced = 0;
}
/*TBD: Check if this is really needed here*/
serial_omap_stop_rx(port);
dma_free_coherent(up->port.dev,
up->uart_dma.rx_buf_size,
up->uart_dma.rx_buf, up->uart_dma.rx_buf_dma_phys);
up->uart_dma.rx_buf = NULL;
tmp = serial_in(up, UART_OMAP_SYSC) & 0x7;
serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
}
free_irq(up->port.irq, up);
if (cancel_work_sync(&up->tty_work))
tty_flip_buffer_work(&up->tty_work);
}
static void serial_omap_start_tx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
#ifdef CONFIG_PM
/* Disallow OCP bus idle. UART TX irqs are not seen during
* bus idle. Alternative is to set kernel timer at fifo
* drain rate.
*/
unsigned int tmp;
tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7) | (1 << 3);
serial_out(up, UART_OMAP_SYSC, tmp); /* no-idle */
#endif
if (up->use_dma && !(up->port.x_char)) {
struct circ_buf *xmit = &up->port.state->xmit;
unsigned int start = up->uart_dma.tx_buf_dma_phys +
(xmit->tail & (UART_XMIT_SIZE - 1));
if (uart_circ_empty(xmit) || up->uart_dma.tx_dma_state)
return;
spin_lock(&(up->uart_dma.tx_lock));
up->uart_dma.tx_dma_state = 1;
spin_unlock(&(up->uart_dma.tx_lock));
up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
/* It is a circular buffer. See if the buffer has wounded back.
* If yes it will have to be transferred in two separate dma
* transfers */
if (start + up->uart_dma.tx_buf_size >= up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
up->uart_dma.tx_buf_size = (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
if (up->uart_dma.tx_dma_channel == 0xFF) {
omap_request_dma(uart_dma_tx[up->pdev->id-1],
"UART Tx DMA",
(void *)uart_tx_dma_callback, up,
&(up->uart_dma.tx_dma_channel));
}
omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
OMAP_DMA_AMODE_CONSTANT,
UART_BASE(up->pdev->id - 1), 0, 0);
omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
OMAP_DMA_AMODE_POST_INC, start, 0, 0);
omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
OMAP_DMA_DATA_TYPE_S8,
up->uart_dma.tx_buf_size, 1,
OMAP_DMA_SYNC_ELEMENT,
uart_dma_tx[(up->pdev->id)-1], 0);
omap_start_dma(up->uart_dma.tx_dma_channel);
} else if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
if (up->restore_autorts) {
serial_omap_set_autorts(up, 1);
up->restore_autorts = 0;
}
}
static void serial_omap_start_tx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
struct circ_buf *xmit;
unsigned int start;
int ret = 0;
if (!up->use_dma) {
serial_omap_enable_ier_thri(up);
if (up->restore_autorts) {
up->restore_autorts = 0;
serial_omap_set_autorts(up, 1);
}
return;
}
xmit = &up->port.state->xmit;
if (uart_circ_empty(xmit) || up->uart_dma.tx_dma_used)
return;
if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE)
ret = omap_request_dma(up->uart_dma.uart_dma_tx,
"UART Tx DMA",
(void *)uart_tx_dma_callback, up,
&(up->uart_dma.tx_dma_channel));
if (ret < 0) {
serial_omap_enable_ier_thri(up);
return;
}
start = up->uart_dma.tx_buf_dma_phys +
(xmit->tail & (UART_XMIT_SIZE - 1));
spin_lock(&(up->uart_dma.tx_lock));
up->uart_dma.tx_dma_used = true;
spin_unlock(&(up->uart_dma.tx_lock));
up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
/*
* It is a circular buffer. See if the buffer has wounded back.
* If yes it will have to be transferred in two separate dma
* transfers
*/
if (start + up->uart_dma.tx_buf_size >=
up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
up->uart_dma.tx_buf_size =
(up->uart_dma.tx_buf_dma_phys +
UART_XMIT_SIZE) - start;
omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
OMAP_DMA_AMODE_CONSTANT,
up->uart_dma.uart_base, 0, 0);
omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
OMAP_DMA_AMODE_POST_INC, start, 0, 0);
omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
OMAP_DMA_DATA_TYPE_S8,
up->uart_dma.tx_buf_size, 1,
OMAP_DMA_SYNC_ELEMENT,
up->uart_dma.uart_dma_tx, 0);
/* FIXME: Cache maintenance needed here? */
omap_start_dma(up->uart_dma.tx_dma_channel);
if (up->restore_autorts) {
up->restore_autorts = 0;
serial_omap_set_autorts(up, 1);
}
}
