* ARM Ltd.
* Philippe Robin, <philippe.robin@arm.com>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/* Simple U-Boot driver for the PrimeCell PL010/PL011 UARTs */
#include <common.h>
#include <watchdog.h>
-
+#include <asm/io.h>
+#include <serial.h>
+#include <linux/compiler.h>
#include "serial_pl01x.h"
-#define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
-#define IO_READ(addr) (*(volatile unsigned int *)(addr))
-
/*
* Integrator AP has two UARTs, we use the first one, at 38400-8-N-1
* Integrator CP has two UARTs, use the first one, at 38400-8-N-1
* Versatile PB has four UARTs.
*/
#define CONSOLE_PORT CONFIG_CONS_INDEX
-#define baudRate CONFIG_BAUDRATE
static volatile unsigned char *const port[] = CONFIG_PL01x_PORTS;
#define NUM_PORTS (sizeof(port)/sizeof(port[0]))
static void pl01x_putc (int portnum, char c);
static int pl01x_getc (int portnum);
static int pl01x_tstc (int portnum);
+unsigned int baudrate = CONFIG_BAUDRATE;
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct pl01x_regs *pl01x_get_regs(int portnum)
+{
+ return (struct pl01x_regs *) port[portnum];
+}
#ifdef CONFIG_PL010_SERIAL
-int serial_init (void)
+static int pl01x_serial_init(void)
{
+ struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
unsigned int divisor;
- /*
- ** First, disable everything.
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
+ /* First, disable everything */
+ writel(0, ®s->pl010_cr);
- /*
- ** Set baud rate
- **
- */
- switch (baudRate) {
+ /* Set baud rate */
+ switch (baudrate) {
case 9600:
divisor = UART_PL010_BAUD_9600;
break;
divisor = UART_PL010_BAUD_38400;
}
- IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRM,
- ((divisor & 0xf00) >> 8));
- IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
+ writel((divisor & 0xf00) >> 8, ®s->pl010_lcrm);
+ writel(divisor & 0xff, ®s->pl010_lcrl);
- /*
- ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRH,
- (UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
+ /* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled */
+ writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN, ®s->pl010_lcrh);
- /*
- ** Finally, enable the UART
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
+ /* Finally, enable the UART */
+ writel(UART_PL010_CR_UARTEN, ®s->pl010_cr);
return 0;
}
#ifdef CONFIG_PL011_SERIAL
-int serial_init (void)
+static int pl01x_serial_init(void)
{
+ struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
unsigned int temp;
unsigned int divider;
unsigned int remainder;
unsigned int fraction;
+ unsigned int lcr;
- /*
- ** First, disable everything.
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
+#ifdef CONFIG_PL011_SERIAL_FLUSH_ON_INIT
+ /* Empty RX fifo if necessary */
+ if (readl(®s->pl011_cr) & UART_PL011_CR_UARTEN) {
+ while (!(readl(®s->fr) & UART_PL01x_FR_RXFE))
+ readl(®s->dr);
+ }
+#endif
+
+ /* First, disable everything */
+ writel(0, ®s->pl011_cr);
/*
- ** Set baud rate
- **
- ** IBRD = UART_CLK / (16 * BAUD_RATE)
- ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
+ * Set baud rate
+ *
+ * IBRD = UART_CLK / (16 * BAUD_RATE)
+ * FBRD = RND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
*/
- temp = 16 * baudRate;
+ temp = 16 * baudrate;
divider = CONFIG_PL011_CLOCK / temp;
remainder = CONFIG_PL011_CLOCK % temp;
- temp = (8 * remainder) / baudRate;
+ temp = (8 * remainder) / baudrate;
fraction = (temp >> 1) + (temp & 1);
- IO_WRITE (port[CONSOLE_PORT] + UART_PL011_IBRD, divider);
- IO_WRITE (port[CONSOLE_PORT] + UART_PL011_FBRD, fraction);
+ writel(divider, ®s->pl011_ibrd);
+ writel(fraction, ®s->pl011_fbrd);
- /*
- ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL011_LCRH,
- (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN));
+ /* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled */
+ lcr = UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN;
+ writel(lcr, ®s->pl011_lcrh);
- /*
- ** Finally, enable the UART
- */
- IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR,
- (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
- UART_PL011_CR_RXE));
+#ifdef CONFIG_PL011_SERIAL_RLCR
+ {
+ int i;
+
+ /*
+ * Program receive line control register after waiting
+ * 10 bus cycles. Delay be writing to readonly register
+ * 10 times
+ */
+ for (i = 0; i < 10; i++)
+ writel(lcr, ®s->fr);
+
+ writel(lcr, ®s->pl011_rlcr);
+ /* lcrh needs to be set again for change to be effective */
+ writel(lcr, ®s->pl011_lcrh);
+ }
+#endif
+ /* Finally, enable the UART */
+ writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE |
+ UART_PL011_CR_RTS, ®s->pl011_cr);
return 0;
}
#endif /* CONFIG_PL011_SERIAL */
-void serial_putc (const char c)
+static void pl01x_serial_putc(const char c)
{
if (c == '\n')
pl01x_putc (CONSOLE_PORT, '\r');
pl01x_putc (CONSOLE_PORT, c);
}
-void serial_puts (const char *s)
-{
- while (*s) {
- serial_putc (*s++);
- }
-}
-
-int serial_getc (void)
+static int pl01x_serial_getc(void)
{
return pl01x_getc (CONSOLE_PORT);
}
-int serial_tstc (void)
+static int pl01x_serial_tstc(void)
{
return pl01x_tstc (CONSOLE_PORT);
}
-void serial_setbrg (void)
+static void pl01x_serial_setbrg(void)
{
+ struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
+
+ baudrate = gd->baudrate;
+ /*
+ * Flush FIFO and wait for non-busy before changing baudrate to avoid
+ * crap in console
+ */
+ while (!(readl(®s->fr) & UART_PL01x_FR_TXFE))
+ WATCHDOG_RESET();
+ while (readl(®s->fr) & UART_PL01x_FR_BUSY)
+ WATCHDOG_RESET();
+ serial_init();
}
static void pl01x_putc (int portnum, char c)
{
+ struct pl01x_regs *regs = pl01x_get_regs(portnum);
+
/* Wait until there is space in the FIFO */
- while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
+ while (readl(®s->fr) & UART_PL01x_FR_TXFF)
WATCHDOG_RESET();
/* Send the character */
- IO_WRITE (port[portnum] + UART_PL01x_DR, c);
+ writel(c, ®s->dr);
}
static int pl01x_getc (int portnum)
{
+ struct pl01x_regs *regs = pl01x_get_regs(portnum);
unsigned int data;
/* Wait until there is data in the FIFO */
- while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
+ while (readl(®s->fr) & UART_PL01x_FR_RXFE)
WATCHDOG_RESET();
- data = IO_READ (port[portnum] + UART_PL01x_DR);
+ data = readl(®s->dr);
/* Check for an error flag */
if (data & 0xFFFFFF00) {
/* Clear the error */
- IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
+ writel(0xFFFFFFFF, ®s->ecr);
return -1;
}
static int pl01x_tstc (int portnum)
{
+ struct pl01x_regs *regs = pl01x_get_regs(portnum);
+
WATCHDOG_RESET();
- return !(IO_READ (port[portnum] + UART_PL01x_FR) &
- UART_PL01x_FR_RXFE);
+ return !(readl(®s->fr) & UART_PL01x_FR_RXFE);
+}
+
+static struct serial_device pl01x_serial_drv = {
+ .name = "pl01x_serial",
+ .start = pl01x_serial_init,
+ .stop = NULL,
+ .setbrg = pl01x_serial_setbrg,
+ .putc = pl01x_serial_putc,
+ .puts = default_serial_puts,
+ .getc = pl01x_serial_getc,
+ .tstc = pl01x_serial_tstc,
+};
+
+void pl01x_serial_initialize(void)
+{
+ serial_register(&pl01x_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &pl01x_serial_drv;
}
projects / karo-tx-uboot.git / blobdiff