Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys)
FPGA Boards such as ARCAngel4/ML50x
Signed-off-by: Alexey Brodkin
Cc: Mischa Jonker
Cc: Francois Bedard
Cc: Tom Rini
Cc: Wolfgang Denk
Cc: Stefano Babic
---
drivers/serial/Makefile | 1 +
drivers/serial/serial.c | 2 +
drivers/serial/serial_arc.c | 105
3 files changed, 108 insertions(+)
create mode 100644 drivers/serial/serial_arc.c
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 6b4cade..5eb4601 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
obj-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
obj-$(CONFIG_MXS_AUART) += mxs_auart.o
+obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_USB_TTY) += usbtty.o
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index df2b84a..05cb369 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -160,6 +160,7 @@ serial_initfunc(sa1100_serial_initialize);
serial_initfunc(sh_serial_initialize);
serial_initfunc(arm_dcc_initialize);
serial_initfunc(mxs_auart_initialize);
+serial_initfunc(arc_serial_initialize);
/**
* serial_register() - Register serial driver with serial driver core
@@ -253,6 +254,7 @@ void serial_initialize(void)
sh_serial_initialize();
arm_dcc_initialize();
mxs_auart_initialize();
+ arc_serial_initialize();
serial_assign(default_serial_console()->name);
}
diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c
new file mode 100644
index 000..e63d25d
--- /dev/null
+++ b/drivers/serial/serial_arc.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include
+#include
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct arc_serial_regs {
+ unsigned int id0;
+ unsigned int id1;
+ unsigned int id2;
+ unsigned int id3;
+ unsigned int data;
+ unsigned int status;
+ unsigned int baudl;
+ unsigned int baudh;
+};
+
+/* Bit definitions of STATUS register */
+#define UART_RXEMPTY (1 << 5)
+#define UART_OVERFLOW_ERR (1 << 1)
+#define UART_TXEMPTY (1 << 7)
+
+struct arc_serial_regs *regs;
+
+static void arc_serial_setbrg(void)
+{
+ int arc_console_baud;
+
+ if (!gd->baudrate)
+ gd->baudrate = CONFIG_BAUDRATE;
+
+ arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1;
+ writel(arc_console_baud & 0xff, ®s->baudl);
+ writel((arc_console_baud & 0xff00) >> 8, ®s->baudh);
+}
+
+static int arc_serial_init(void)
+{
+ regs = (struct arc_serial_regs *)CONFIG_ARC_UART_BASE;
+ serial_setbrg();
+ return 0;
+}
+
+static void arc_serial_putc(const char c)
+{
+ if (c == '\n')
+ arc_serial_putc('\r');
+
+ while (!(readl(®s->status) & UART_TXEMPTY))
+ ;
+
+ writel(c, ®s->data);
+}
+
+static int arc_serial_tstc(void)
+{
+ return !(readl(®s->status) & UART_RXEMPTY);
+}
+
+static int arc_serial_getc(void)
+{
+ while (!arc_serial_tstc())
+ ;
+
+ /* Check for overflow errors */
+ if (readl(®s->status) & UART_OVERFLOW_ERR)
+ return 0;
+
+ return readl(®s->data) & 0xFF;
+}
+
+static void arc_serial_puts(const char *s)
+{
+ while (*s)
+ arc_serial_putc(*s++);
+}
+
+static struct serial_device arc_serial_drv = {
+ .name = "arc_serial",
+ .start = arc_serial_init,
+ .stop = NULL,
+ .setbrg = arc_serial_setbrg,
+ .putc = arc_serial_putc,
+ .puts = arc_serial_puts,
+ .getc = arc_serial_getc,
+ .tstc = arc_serial_tstc,
+};
+
+void arc_serial_initialize(void)
+{
+ serial_register(&arc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &arc_serial_drv;
+}
--
1.8.4.2
___
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
