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tty: serial: uartlite: Support uartlite on big and little endian systems 

Use big and little endian accessors function to reflect system configuration.
Detection is done via control register in ulite_request_port.

Tested on Microblaze LE, BE, PPC440 and Arm zynq.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michal Simek 2013-02-11 19:04:34 +01:00 committed by Greg Kroah-Hartman
parent 3240b48d49
commit 6d53c3b71d
1 changed files with 79 additions and 22 deletions
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101
drivers/tty/serial/uartlite.c
View File

@ -34,7 +34,7 @@
* Register definitions
*
* For register details see datasheet:
* http://www.xilinx.com/support/documentation/ip_documentation/opb_uartlite.pdf
* http://www.xilinx.com/support/documentation/ip_documentation/opb_uartlite.pdf
*/
#define ULITE_RX 0x00
@ -57,6 +57,54 @@
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
struct uartlite_reg_ops {
u32 (*in)(void __iomem *addr);
void (*out)(u32 val, void __iomem *addr);
};
static u32 uartlite_inbe32(void __iomem *addr)
{
return ioread32be(addr);
}
static void uartlite_outbe32(u32 val, void __iomem *addr)
{
iowrite32be(val, addr);
}
static struct uartlite_reg_ops uartlite_be = {
.in = uartlite_inbe32,
.out = uartlite_outbe32,
};
static u32 uartlite_inle32(void __iomem *addr)
{
return ioread32(addr);
}
static void uartlite_outle32(u32 val, void __iomem *addr)
{
iowrite32(val, addr);
}
static struct uartlite_reg_ops uartlite_le = {
.in = uartlite_inle32,
.out = uartlite_outle32,
};
static inline u32 uart_in32(u32 offset, struct uart_port *port)
{
struct uartlite_reg_ops *reg_ops = port->private_data;
return reg_ops->in(port->membase + offset);
}
static inline void uart_out32(u32 val, u32 offset, struct uart_port *port)
{
struct uartlite_reg_ops *reg_ops = port->private_data;
reg_ops->out(val, port->membase + offset);
}
static struct uart_port ulite_ports[ULITE_NR_UARTS];
@ -77,7 +125,7 @@ static int ulite_receive(struct uart_port *port, int stat)
/* stats */
if (stat & ULITE_STATUS_RXVALID) {
port->icount.rx++;
ch = ioread32be(port->membase + ULITE_RX);
ch = uart_in32(ULITE_RX, port);
if (stat & ULITE_STATUS_PARITY)
port->icount.parity++;
@ -122,7 +170,7 @@ static int ulite_transmit(struct uart_port *port, int stat)
return 0;
if (port->x_char) {
iowrite32be(port->x_char, port->membase + ULITE_TX);
uart_out32(port->x_char, ULITE_TX, port);
port->x_char = 0;
port->icount.tx++;
return 1;
@ -131,7 +179,7 @@ static int ulite_transmit(struct uart_port *port, int stat)
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return 0;
iowrite32be(xmit->buf[xmit->tail], port->membase + ULITE_TX);
uart_out32(xmit->buf[xmit->tail], ULITE_TX, port);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
port->icount.tx++;
@ -148,7 +196,7 @@ static irqreturn_t ulite_isr(int irq, void *dev_id)
int busy, n = 0;
do {
int stat = ioread32be(port->membase + ULITE_STATUS);
int stat = uart_in32(ULITE_STATUS, port);
busy = ulite_receive(port, stat);
busy |= ulite_transmit(port, stat);
n++;
@ -169,7 +217,7 @@ static unsigned int ulite_tx_empty(struct uart_port *port)
unsigned int ret;
spin_lock_irqsave(&port->lock, flags);
ret = ioread32be(port->membase + ULITE_STATUS);
ret = uart_in32(ULITE_STATUS, port);
spin_unlock_irqrestore(&port->lock, flags);
return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
@ -192,7 +240,7 @@ static void ulite_stop_tx(struct uart_port *port)
static void ulite_start_tx(struct uart_port *port)
{
ulite_transmit(port, ioread32be(port->membase + ULITE_STATUS));
ulite_transmit(port, uart_in32(ULITE_STATUS, port));
}
static void ulite_stop_rx(struct uart_port *port)
@ -220,17 +268,17 @@ static int ulite_startup(struct uart_port *port)
if (ret)
return ret;
iowrite32be(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
port->membase + ULITE_CONTROL);
iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
uart_out32(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
ULITE_CONTROL, port);
uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port);
return 0;
}
static void ulite_shutdown(struct uart_port *port)
{
iowrite32be(0, port->membase + ULITE_CONTROL);
ioread32be(port->membase + ULITE_CONTROL); /* dummy */
uart_out32(0, ULITE_CONTROL, port);
uart_in32(ULITE_CONTROL, port); /* dummy */
free_irq(port->irq, port);
}
@ -281,6 +329,8 @@ static void ulite_release_port(struct uart_port *port)
static int ulite_request_port(struct uart_port *port)
{
int ret;
pr_debug("ulite console: port=%p; port->mapbase=%llx\n",
port, (unsigned long long) port->mapbase);
@ -296,6 +346,14 @@ static int ulite_request_port(struct uart_port *port)
return -EBUSY;
}
port->private_data = &uartlite_be;
ret = uart_in32(ULITE_CONTROL, port);
uart_out32(ULITE_CONTROL_RST_TX, ULITE_CONTROL, port);
ret = uart_in32(ULITE_STATUS, port);
/* Endianess detection */
if ((ret & ULITE_STATUS_TXEMPTY) != ULITE_STATUS_TXEMPTY)
port->private_data = &uartlite_le;
return 0;
}
@ -314,20 +372,19 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
#ifdef CONFIG_CONSOLE_POLL
static int ulite_get_poll_char(struct uart_port *port)
{
if (!(ioread32be(port->membase + ULITE_STATUS)
& ULITE_STATUS_RXVALID))
if (!(uart_in32(ULITE_STATUS, port) & ULITE_STATUS_RXVALID))
return NO_POLL_CHAR;
return ioread32be(port->membase + ULITE_RX);
return uart_in32(ULITE_RX, port);
}
static void ulite_put_poll_char(struct uart_port *port, unsigned char ch)
{
while (ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_TXFULL)
while (uart_in32(ULITE_STATUS, port) & ULITE_STATUS_TXFULL)
cpu_relax();
/* write char to device */
iowrite32be(ch, port->membase + ULITE_TX);
uart_out32(ch, ULITE_TX, port);
}
#endif
@ -366,7 +423,7 @@ static void ulite_console_wait_tx(struct uart_port *port)
/* Spin waiting for TX fifo to have space available */
for (i = 0; i < 100000; i++) {
val = ioread32be(port->membase + ULITE_STATUS);
val = uart_in32(ULITE_STATUS, port);
if ((val & ULITE_STATUS_TXFULL) == 0)
break;
cpu_relax();
@ -376,7 +433,7 @@ static void ulite_console_wait_tx(struct uart_port *port)
static void ulite_console_putchar(struct uart_port *port, int ch)
{
ulite_console_wait_tx(port);
iowrite32be(ch, port->membase + ULITE_TX);
uart_out32(ch, ULITE_TX, port);
}
static void ulite_console_write(struct console *co, const char *s,
@ -393,8 +450,8 @@ static void ulite_console_write(struct console *co, const char *s,
spin_lock_irqsave(&port->lock, flags);
/* save and disable interrupt */
ier = ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
iowrite32be(0, port->membase + ULITE_CONTROL);
ier = uart_in32(ULITE_STATUS, port) & ULITE_STATUS_IE;
uart_out32(0, ULITE_CONTROL, port);
uart_console_write(port, s, count, ulite_console_putchar);
@ -402,7 +459,7 @@ static void ulite_console_write(struct console *co, const char *s,
/* restore interrupt state */
if (ier)
iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port);
if (locked)
spin_unlock_irqrestore(&port->lock, flags);