sparc: Update LEON serial drivers to use readl/writel macros
Update the LEON2/3 serial driver to make use of the readl and writel
macros as well as the WATCHDOG_RESET() macro.
Add readl/writel and friends to the asm/io.h file.
Introduce the gd->arch.uart variable to store register address.
Lastly, remove baudrate scaler macro variables from board config. It
is now calculated in the serial driver using the global data variable.
Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>
diff --git a/arch/sparc/cpu/leon3/prom.c b/arch/sparc/cpu/leon3/prom.c
index b83776b..d0f1860 100644
--- a/arch/sparc/cpu/leon3/prom.c
+++ b/arch/sparc/cpu/leon3/prom.c
@@ -21,7 +21,8 @@
#define PRINT_ROM_VEC
*/
extern struct linux_romvec *kernel_arg_promvec;
-extern ambapp_dev_apbuart *leon3_apbuart;
+
+DECLARE_GLOBAL_DATA_PTR;
#define PROM_PGT __attribute__ ((__section__ (".prom.pgt")))
#define PROM_TEXT __attribute__ ((__section__ (".prom.text")))
@@ -909,7 +910,7 @@
pspi->avail.num_bytes = pspi->totphys.num_bytes;
/* Set the pointer to the Console UART in romvec */
- pspi->reloc_funcs.leon3_apbuart = leon3_apbuart;
+ pspi->reloc_funcs.leon3_apbuart = gd->arch.uart;
{
int j = 1;
diff --git a/arch/sparc/cpu/leon3/serial.c b/arch/sparc/cpu/leon3/serial.c
index bca6b65..f1dcab3 100644
--- a/arch/sparc/cpu/leon3/serial.c
+++ b/arch/sparc/cpu/leon3/serial.c
@@ -1,66 +1,70 @@
/* GRLIB APBUART Serial controller driver
*
- * (C) Copyright 2007
- * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
+ * (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 <linux/compiler.h>
+#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
-ambapp_dev_apbuart *leon3_apbuart = NULL;
-
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);
+ gd->arch.uart = uart;
+ return 0;
+}
- return 0;
- }
- return -1; /* didn't find hardware */
+static inline ambapp_dev_apbuart *leon3_get_uart_regs(void)
+{
+ ambapp_dev_apbuart *uart = gd->arch.uart;
+ return uart;
}
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
}
@@ -74,36 +78,44 @@
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);
}
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 */
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 = {