/* GRLIB APBUART Serial controller driver
*
- * (C) Copyright 2007
- * Daniel Hellstrom, Gaisler Research, daniel@gaisler.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
+ * (C) Copyright 2007, 2015
+ * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
*
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
-#include <asm/processor.h>
-#include <asm/leon.h>
+#include <asm/io.h>
#include <ambapp.h>
+#include <serial.h>
+#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
-/* Force cache miss each time a serial controller reg is read */
-#define CACHE_BYPASS 1
-
-#ifdef CACHE_BYPASS
-#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)&(var))
-#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)&(var))
-#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)&(var))
-#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)&(var))
-#endif
-
-ambapp_dev_apbuart *leon3_apbuart = NULL;
-
-int serial_init(void)
+static int leon3_serial_init(void)
{
+ ambapp_dev_apbuart *uart;
ambapp_apbdev apbdev;
unsigned int tmp;
/* find UART */
- if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) {
+ if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) != 1)
+ return -1; /* didn't find hardware */
- leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address;
+ /* found apbuart, let's init .. */
+ uart = (ambapp_dev_apbuart *) apbdev.address;
- /* found apbuart, let's init...
- *
- * Set scaler / baud rate
- *
- * Receiver & transmitter enable
- */
- leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER;
+ /* Set scaler / baud rate */
+ tmp = (((CONFIG_SYS_CLK_FREQ*10) / (CONFIG_BAUDRATE*8)) - 5)/10;
+ writel(tmp, &uart->scaler);
- /* Let bit 11 be unchanged (debug bit for GRMON) */
- tmp = READ_WORD(leon3_apbuart->ctrl);
+ /* Let bit 11 be unchanged (debug bit for GRMON) */
+ tmp = readl(&uart->ctrl) & LEON_REG_UART_CTRL_DBG;
+ /* Receiver & transmitter enable */
+ tmp |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE;
+ writel(tmp, &uart->ctrl);
- leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) |
- LEON_REG_UART_CTRL_RE |
- LEON_REG_UART_CTRL_TE);
-
- return 0;
- }
- return -1; /* didn't find hardware */
+ gd->arch.uart = uart;
+ return 0;
}
-void serial_putc(const char c)
+static inline ambapp_dev_apbuart *leon3_get_uart_regs(void)
{
- if (c == '\n')
- serial_putc_raw('\r');
-
- serial_putc_raw(c);
+ ambapp_dev_apbuart *uart = gd->arch.uart;
+ return uart;
}
-void serial_putc_raw(const char c)
+static void leon3_serial_putc_raw(const char c)
{
- if (!leon3_apbuart)
+ ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
+
+ if (!uart)
return;
/* Wait for last character to go. */
- while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ;
+ while (!(readl(&uart->status) & LEON_REG_UART_STATUS_THE))
+ WATCHDOG_RESET();
/* Send data */
- leon3_apbuart->data = c;
+ writel(c, &uart->data);
#ifdef LEON_DEBUG
/* Wait for data to be sent */
- while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ;
+ while (!(readl(&uart->status) & LEON_REG_UART_STATUS_TSE))
+ WATCHDOG_RESET();
#endif
}
-void serial_puts(const char *s)
+static void leon3_serial_putc(const char c)
{
- while (*s) {
- serial_putc(*s++);
- }
+ if (c == '\n')
+ leon3_serial_putc_raw('\r');
+
+ leon3_serial_putc_raw(c);
}
-int serial_getc(void)
+static int leon3_serial_getc(void)
{
- if (!leon3_apbuart)
+ ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
+
+ if (!uart)
return 0;
/* Wait for a character to arrive. */
- while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ;
+ while (!(readl(&uart->status) & LEON_REG_UART_STATUS_DR))
+ WATCHDOG_RESET();
- /* read data */
- return READ_WORD(leon3_apbuart->data);
+ /* Read character data */
+ return readl(&uart->data);
}
-int serial_tstc(void)
+static int leon3_serial_tstc(void)
{
- if (leon3_apbuart)
- return (READ_WORD(leon3_apbuart->status) &
- LEON_REG_UART_STATUS_DR);
- return 0;
+ ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
+
+ if (!uart)
+ return 0;
+
+ return readl(&uart->status) & LEON_REG_UART_STATUS_DR;
}
/* set baud rate for uart */
-void serial_setbrg(void)
+static void leon3_serial_setbrg(void)
{
- /* update baud rate settings, read it from gd->baudrate */
+ ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
unsigned int scaler;
- if (leon3_apbuart && (gd->baudrate > 0)) {
- scaler =
- (((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
- 5) / 10;
- leon3_apbuart->scaler = scaler;
- }
- return;
+
+ if (!uart)
+ return;
+
+ if (!gd->baudrate)
+ gd->baudrate = CONFIG_BAUDRATE;
+
+ scaler = (((CONFIG_SYS_CLK_FREQ*10) / (gd->baudrate*8)) - 5)/10;
+
+ writel(scaler, &uart->scaler);
+}
+
+static struct serial_device leon3_serial_drv = {
+ .name = "leon3_serial",
+ .start = leon3_serial_init,
+ .stop = NULL,
+ .setbrg = leon3_serial_setbrg,
+ .putc = leon3_serial_putc,
+ .puts = default_serial_puts,
+ .getc = leon3_serial_getc,
+ .tstc = leon3_serial_tstc,
+};
+
+void leon3_serial_initialize(void)
+{
+ serial_register(&leon3_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &leon3_serial_drv;
}
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