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path: root/drivers/serial/imx.c
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Diffstat (limited to 'drivers/serial/imx.c')
-rw-r--r--drivers/serial/imx.c268
1 files changed, 205 insertions, 63 deletions
diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 04cc88cc528c..e42faa4e4282 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -46,6 +46,122 @@
#include <asm/hardware.h>
#include <asm/arch/imx-uart.h>
+/* Register definitions */
+#define URXD0 0x0 /* Receiver Register */
+#define URTX0 0x40 /* Transmitter Register */
+#define UCR1 0x80 /* Control Register 1 */
+#define UCR2 0x84 /* Control Register 2 */
+#define UCR3 0x88 /* Control Register 3 */
+#define UCR4 0x8c /* Control Register 4 */
+#define UFCR 0x90 /* FIFO Control Register */
+#define USR1 0x94 /* Status Register 1 */
+#define USR2 0x98 /* Status Register 2 */
+#define UESC 0x9c /* Escape Character Register */
+#define UTIM 0xa0 /* Escape Timer Register */
+#define UBIR 0xa4 /* BRM Incremental Register */
+#define UBMR 0xa8 /* BRM Modulator Register */
+#define UBRC 0xac /* Baud Rate Count Register */
+#define BIPR1 0xb0 /* Incremental Preset Register 1 */
+#define BIPR2 0xb4 /* Incremental Preset Register 2 */
+#define BIPR3 0xb8 /* Incremental Preset Register 3 */
+#define BIPR4 0xbc /* Incremental Preset Register 4 */
+#define BMPR1 0xc0 /* BRM Modulator Register 1 */
+#define BMPR2 0xc4 /* BRM Modulator Register 2 */
+#define BMPR3 0xc8 /* BRM Modulator Register 3 */
+#define BMPR4 0xcc /* BRM Modulator Register 4 */
+#define UTS 0xd0 /* UART Test Register */
+
+/* UART Control Register Bit Fields.*/
+#define URXD_CHARRDY (1<<15)
+#define URXD_ERR (1<<14)
+#define URXD_OVRRUN (1<<13)
+#define URXD_FRMERR (1<<12)
+#define URXD_BRK (1<<11)
+#define URXD_PRERR (1<<10)
+#define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
+#define UCR1_ADBR (1<<14) /* Auto detect baud rate */
+#define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
+#define UCR1_IDEN (1<<12) /* Idle condition interrupt */
+#define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
+#define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
+#define UCR1_IREN (1<<7) /* Infrared interface enable */
+#define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
+#define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
+#define UCR1_SNDBRK (1<<4) /* Send break */
+#define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
+#define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
+#define UCR1_DOZE (1<<1) /* Doze */
+#define UCR1_UARTEN (1<<0) /* UART enabled */
+#define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
+#define UCR2_IRTS (1<<14) /* Ignore RTS pin */
+#define UCR2_CTSC (1<<13) /* CTS pin control */
+#define UCR2_CTS (1<<12) /* Clear to send */
+#define UCR2_ESCEN (1<<11) /* Escape enable */
+#define UCR2_PREN (1<<8) /* Parity enable */
+#define UCR2_PROE (1<<7) /* Parity odd/even */
+#define UCR2_STPB (1<<6) /* Stop */
+#define UCR2_WS (1<<5) /* Word size */
+#define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
+#define UCR2_TXEN (1<<2) /* Transmitter enabled */
+#define UCR2_RXEN (1<<1) /* Receiver enabled */
+#define UCR2_SRST (1<<0) /* SW reset */
+#define UCR3_DTREN (1<<13) /* DTR interrupt enable */
+#define UCR3_PARERREN (1<<12) /* Parity enable */
+#define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
+#define UCR3_DSR (1<<10) /* Data set ready */
+#define UCR3_DCD (1<<9) /* Data carrier detect */
+#define UCR3_RI (1<<8) /* Ring indicator */
+#define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */
+#define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
+#define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
+#define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
+#define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */
+#define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */
+#define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
+#define UCR3_BPEN (1<<0) /* Preset registers enable */
+#define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
+#define UCR4_INVR (1<<9) /* Inverted infrared reception */
+#define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
+#define UCR4_WKEN (1<<7) /* Wake interrupt enable */
+#define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
+#define UCR4_IRSC (1<<5) /* IR special case */
+#define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
+#define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
+#define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
+#define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
+#define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
+#define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
+#define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
+#define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
+#define USR1_RTSS (1<<14) /* RTS pin status */
+#define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
+#define USR1_RTSD (1<<12) /* RTS delta */
+#define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
+#define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
+#define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
+#define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
+#define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
+#define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
+#define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
+#define USR2_ADET (1<<15) /* Auto baud rate detect complete */
+#define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
+#define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
+#define USR2_IDLE (1<<12) /* Idle condition */
+#define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
+#define USR2_WAKE (1<<7) /* Wake */
+#define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
+#define USR2_TXDC (1<<3) /* Transmitter complete */
+#define USR2_BRCD (1<<2) /* Break condition */
+#define USR2_ORE (1<<1) /* Overrun error */
+#define USR2_RDR (1<<0) /* Recv data ready */
+#define UTS_FRCPERR (1<<13) /* Force parity error */
+#define UTS_LOOP (1<<12) /* Loop tx and rx */
+#define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
+#define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
+#define UTS_TXFULL (1<<4) /* TxFIFO full */
+#define UTS_RXFULL (1<<3) /* RxFIFO full */
+#define UTS_SOFTRST (1<<0) /* Software reset */
+
/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_IMX_MAJOR 204
#define MINOR_START 41
@@ -128,7 +244,10 @@ static void imx_timeout(unsigned long data)
static void imx_stop_tx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
- UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
+ unsigned long temp;
+
+ temp = readl(sport->port.membase + UCR1);
+ writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
}
/*
@@ -137,7 +256,10 @@ static void imx_stop_tx(struct uart_port *port)
static void imx_stop_rx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
- UCR2((u32)sport->port.membase) &= ~UCR2_RXEN;
+ unsigned long temp;
+
+ temp = readl(sport->port.membase + UCR2);
+ writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2);
}
/*
@@ -154,10 +276,10 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
{
struct circ_buf *xmit = &sport->port.info->xmit;
- while (!(UTS((u32)sport->port.membase) & UTS_TXFULL)) {
+ while (!(readl(sport->port.membase + UTS) & UTS_TXFULL)) {
/* send xmit->buf[xmit->tail]
* out the port here */
- URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail];
+ writel(xmit->buf[xmit->tail], sport->port.membase + URTX0);
xmit->tail = (xmit->tail + 1) &
(UART_XMIT_SIZE - 1);
sport->port.icount.tx++;
@@ -175,21 +297,24 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
static void imx_start_tx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
+ unsigned long temp;
- UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN;
+ temp = readl(sport->port.membase + UCR1);
+ writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
- imx_transmit_buffer(sport);
+ if (readl(sport->port.membase + UTS) & UTS_TXEMPTY)
+ imx_transmit_buffer(sport);
}
static irqreturn_t imx_rtsint(int irq, void *dev_id)
{
struct imx_port *sport = (struct imx_port *)dev_id;
- unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;
+ unsigned int val = readl(sport->port.membase + USR1) & USR1_RTSS;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
- USR1((u32)sport->port.membase) = USR1_RTSD;
+ writel(USR1_RTSD, sport->port.membase + USR1);
uart_handle_cts_change(&sport->port, !!val);
wake_up_interruptible(&sport->port.info->delta_msr_wait);
@@ -207,7 +332,7 @@ static irqreturn_t imx_txint(int irq, void *dev_id)
if (sport->port.x_char)
{
/* Send next char */
- URTX0((u32)sport->port.membase) = sport->port.x_char;
+ writel(sport->port.x_char, sport->port.membase + URTX0);
goto out;
}
@@ -231,17 +356,18 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
struct imx_port *sport = dev_id;
unsigned int rx,flg,ignored = 0;
struct tty_struct *tty = sport->port.info->tty;
- unsigned long flags;
+ unsigned long flags, temp;
- rx = URXD0((u32)sport->port.membase);
+ rx = readl(sport->port.membase + URXD0);
spin_lock_irqsave(&sport->port.lock,flags);
do {
flg = TTY_NORMAL;
sport->port.icount.rx++;
- if( USR2((u32)sport->port.membase) & USR2_BRCD ) {
- USR2((u32)sport->port.membase) |= USR2_BRCD;
+ temp = readl(sport->port.membase + USR2);
+ if( temp & USR2_BRCD ) {
+ writel(temp | USR2_BRCD, sport->port.membase + USR2);
if(uart_handle_break(&sport->port))
goto ignore_char;
}
@@ -257,7 +383,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
tty_insert_flip_char(tty, rx, flg);
ignore_char:
- rx = URXD0((u32)sport->port.membase);
+ rx = readl(sport->port.membase + URXD0);
} while(rx & URXD_CHARRDY);
out:
@@ -301,7 +427,7 @@ static unsigned int imx_tx_empty(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
- return USR2((u32)sport->port.membase) & USR2_TXDC ? TIOCSER_TEMT : 0;
+ return (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0;
}
/*
@@ -312,10 +438,10 @@ static unsigned int imx_get_mctrl(struct uart_port *port)
struct imx_port *sport = (struct imx_port *)port;
unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
- if (USR1((u32)sport->port.membase) & USR1_RTSS)
+ if (readl(sport->port.membase + USR1) & USR1_RTSS)
tmp |= TIOCM_CTS;
- if (UCR2((u32)sport->port.membase) & UCR2_CTS)
+ if (readl(sport->port.membase + UCR2) & UCR2_CTS)
tmp |= TIOCM_RTS;
return tmp;
@@ -324,11 +450,14 @@ static unsigned int imx_get_mctrl(struct uart_port *port)
static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct imx_port *sport = (struct imx_port *)port;
+ unsigned long temp;
+
+ temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
if (mctrl & TIOCM_RTS)
- UCR2((u32)sport->port.membase) |= UCR2_CTS;
- else
- UCR2((u32)sport->port.membase) &= ~UCR2_CTS;
+ temp |= UCR2_CTS;
+
+ writel(temp, sport->port.membase + UCR2);
}
/*
@@ -337,14 +466,16 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void imx_break_ctl(struct uart_port *port, int break_state)
{
struct imx_port *sport = (struct imx_port *)port;
- unsigned long flags;
+ unsigned long flags, temp;
spin_lock_irqsave(&sport->port.lock, flags);
+ temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
+
if ( break_state != 0 )
- UCR1((u32)sport->port.membase) |= UCR1_SNDBRK;
- else
- UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK;
+ temp |= UCR1_SNDBRK;
+
+ writel(temp, sport->port.membase + UCR1);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
@@ -360,7 +491,7 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
/* set receiver / transmitter trigger level.
* RFDIV is set such way to satisfy requested uartclk value
*/
- val = TXTL<<10 | RXTL;
+ val = TXTL << 10 | RXTL;
ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk;
if(!ufcr_rfdiv)
@@ -373,7 +504,7 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
val |= UFCR_RFDIV & (ufcr_rfdiv << 7);
- UFCR((u32)sport->port.membase) = val;
+ writel(val, sport->port.membase + UFCR);
return 0;
}
@@ -382,14 +513,15 @@ static int imx_startup(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
int retval;
- unsigned long flags;
+ unsigned long flags, temp;
imx_setup_ufcr(sport, 0);
/* disable the DREN bit (Data Ready interrupt enable) before
* requesting IRQs
*/
- UCR4((u32)sport->port.membase) &= ~UCR4_DREN;
+ temp = readl(sport->port.membase + UCR4);
+ writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
/*
* Allocate the IRQ
@@ -411,12 +543,16 @@ static int imx_startup(struct uart_port *port)
/*
* Finally, clear and enable interrupts
*/
+ writel(USR1_RTSD, sport->port.membase + USR1);
+
+ temp = readl(sport->port.membase + UCR1);
+ temp |= (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
+ writel(temp, sport->port.membase + UCR1);
- USR1((u32)sport->port.membase) = USR1_RTSD;
- UCR1((u32)sport->port.membase) |=
- (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
+ temp = readl(sport->port.membase + UCR2);
+ temp |= (UCR2_RXEN | UCR2_TXEN);
+ writel(temp, sport->port.membase + UCR2);
- UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
/*
* Enable modem status interrupts
*/
@@ -437,6 +573,7 @@ error_out1:
static void imx_shutdown(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
+ unsigned long temp;
/*
* Stop our timer.
@@ -454,8 +591,9 @@ static void imx_shutdown(struct uart_port *port)
* Disable all interrupts, port and break condition.
*/
- UCR1((u32)sport->port.membase) &=
- ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
+ temp = readl(sport->port.membase + UCR1);
+ temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
+ writel(temp, sport->port.membase + UCR1);
}
static void
@@ -548,18 +686,18 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
/*
* disable interrupts and drain transmitter
*/
- old_ucr1 = UCR1((u32)sport->port.membase);
- UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
+ old_ucr1 = readl(sport->port.membase + UCR1);
+ writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
+ sport->port.membase + UCR1);
- while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
+ while ( !(readl(sport->port.membase + USR2) & USR2_TXDC))
barrier();
/* then, disable everything */
- old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN );
- UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN);
-
- /* set the parity, stop bits and data size */
- UCR2((u32)sport->port.membase) = ucr2;
+ old_txrxen = readl(sport->port.membase + UCR2);
+ writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN),
+ sport->port.membase + UCR2);
+ old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
/* set the baud rate. We assume uartclk = 16 MHz
*
@@ -567,11 +705,13 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
* --------- = --------
* uartclk UBMR - 1
*/
- UBIR((u32)sport->port.membase) = (baud / 100) - 1;
- UBMR((u32)sport->port.membase) = 10000 - 1;
+ writel((baud / 100) - 1, sport->port.membase + UBIR);
+ writel(10000 - 1, sport->port.membase + UBMR);
+
+ writel(old_ucr1, sport->port.membase + UCR1);
- UCR1((u32)sport->port.membase) = old_ucr1;
- UCR2((u32)sport->port.membase) |= old_txrxen;
+ /* set the parity, stop bits and data size */
+ writel(ucr2 | old_txrxen, sport->port.membase + UCR2);
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
imx_enable_ms(&sport->port);
@@ -730,9 +870,11 @@ static void __init imx_init_ports(void)
static void imx_console_putchar(struct uart_port *port, int ch)
{
struct imx_port *sport = (struct imx_port *)port;
- while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
+
+ while (readl(sport->port.membase + UTS) & UTS_TXFULL)
barrier();
- URTX0((u32)sport->port.membase) = ch;
+
+ writel(ch, sport->port.membase + URTX0);
}
/*
@@ -747,13 +889,14 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
/*
* First, save UCR1/2 and then disable interrupts
*/
- old_ucr1 = UCR1((u32)sport->port.membase);
- old_ucr2 = UCR2((u32)sport->port.membase);
+ old_ucr1 = readl(sport->port.membase + UCR1);
+ old_ucr2 = readl(sport->port.membase + UCR2);
- UCR1((u32)sport->port.membase) =
- (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
- & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
- UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;
+ writel((old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN) &
+ ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
+ sport->port.membase + UCR1);
+
+ writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
uart_console_write(&sport->port, s, count, imx_console_putchar);
@@ -761,10 +904,10 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
* Finally, wait for transmitter to become empty
* and restore UCR1/2
*/
- while (!(USR2((u32)sport->port.membase) & USR2_TXDC));
+ while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
- UCR1((u32)sport->port.membase) = old_ucr1;
- UCR2((u32)sport->port.membase) = old_ucr2;
+ writel(old_ucr1, sport->port.membase + UCR1);
+ writel(old_ucr2, sport->port.membase + UCR2);
}
/*
@@ -776,13 +919,13 @@ imx_console_get_options(struct imx_port *sport, int *baud,
int *parity, int *bits)
{
- if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
+ if ( readl(sport->port.membase + UCR1) | UCR1_UARTEN ) {
/* ok, the port was enabled */
unsigned int ucr2, ubir,ubmr, uartclk;
unsigned int baud_raw;
unsigned int ucfr_rfdiv;
- ucr2 = UCR2((u32)sport->port.membase);
+ ucr2 = readl(sport->port.membase + UCR2);
*parity = 'n';
if (ucr2 & UCR2_PREN) {
@@ -797,11 +940,10 @@ imx_console_get_options(struct imx_port *sport, int *baud,
else
*bits = 7;
- ubir = UBIR((u32)sport->port.membase) & 0xffff;
- ubmr = UBMR((u32)sport->port.membase) & 0xffff;
-
+ ubir = readl(sport->port.membase + UBIR) & 0xffff;
+ ubmr = readl(sport->port.membase + UBMR) & 0xffff;
- ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7;
+ ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7;
if (ucfr_rfdiv == 6)
ucfr_rfdiv = 7;
else
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 04:03:11 +0000