serial/serial_arc - add driver for ARC UART

Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Mischa Jonker <mjonker@synopsys.com> Cc: Francois Bedard <fbedard@synopsys.com> Cc: Tom Rini <trini@ti.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Stefano Babic <sbabic@denx.de>

serial/serial_arc - add driver for ARC UART
Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Mischa Jonker <mjonker@synopsys.com> Cc: Francois Bedard <fbedard@synopsys.com> Cc: Tom Rini <trini@ti.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Stefano Babic <sbabic@denx.de>
Alexey Brodkin · Tom Rini
1 parent 1a78d28d02
Showing 3 changed files with 108 additions and 0 deletions Side-by-side Diff
drivers/serial/Makefile
drivers/serial/serial.c
drivers/serial/serial_arc.c
@@ -34,6 +34,7 @@
 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
@@ -160,6 +160,7 @@
 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 @@
 	sh_serial_initialize();
 	arm_dcc_initialize();
 	mxs_auart_initialize();
+	arc_serial_initialize();
  
 	serial_assign(default_serial_console()->name);
 }
+/*
+ * 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 <common.h>
+#include <serial.h>
+
+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, &regs->baudl);
+	writel((arc_console_baud & 0xff00) >> 8, &regs->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(&regs->status) & UART_TXEMPTY))
+		;
+
+	writel(c, &regs->data);
+}
+
+static int arc_serial_tstc(void)
+{
+	return !(readl(&regs->status) & UART_RXEMPTY);
+}
+
+static int arc_serial_getc(void)
+{
+	while (!arc_serial_tstc())
+		;
+
+	/* Check for overflow errors */
+	if (readl(&regs->status) & UART_OVERFLOW_ERR)
+		return 0;
+
+	return readl(&regs->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;
+}
...	...	@@ -34,6 +34,7 @@
34	34	obj-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
35	35	obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
36	36	obj-$(CONFIG_MXS_AUART) += mxs_auart.o
	37	+obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
37	38
38	39	ifndef CONFIG_SPL_BUILD
39	40	obj-$(CONFIG_USB_TTY) += usbtty.o
...	...	@@ -160,6 +160,7 @@
160	160	serial_initfunc(sh_serial_initialize);
161	161	serial_initfunc(arm_dcc_initialize);
162	162	serial_initfunc(mxs_auart_initialize);
	163	+serial_initfunc(arc_serial_initialize);
163	164
164	165	/**
165	166	* serial_register() - Register serial driver with serial driver core
...	...	@@ -253,6 +254,7 @@
253	254	sh_serial_initialize();
254	255	arm_dcc_initialize();
255	256	mxs_auart_initialize();
	257	+ arc_serial_initialize();
256	258
257	259	serial_assign(default_serial_console()->name);
258	260	}
	1	+/*
	2	+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
	3	+ *
	4	+ * This program is free software; you can redistribute it and/or modify
	5	+ * it under the terms of the GNU General Public License version 2 as
	6	+ * published by the Free Software Foundation.
	7	+ *
	8	+ */
	9	+
	10	+#include <common.h>
	11	+#include <serial.h>
	12	+
	13	+DECLARE_GLOBAL_DATA_PTR;
	14	+
	15	+struct arc_serial_regs {
	16	+ unsigned int id0;
	17	+ unsigned int id1;
	18	+ unsigned int id2;
	19	+ unsigned int id3;
	20	+ unsigned int data;
	21	+ unsigned int status;
	22	+ unsigned int baudl;
	23	+ unsigned int baudh;
	24	+};
	25	+
	26	+/* Bit definitions of STATUS register */
	27	+#define UART_RXEMPTY (1 << 5)
	28	+#define UART_OVERFLOW_ERR (1 << 1)
	29	+#define UART_TXEMPTY (1 << 7)
	30	+
	31	+struct arc_serial_regs *regs;
	32	+
	33	+static void arc_serial_setbrg(void)
	34	+{
	35	+ int arc_console_baud;
	36	+
	37	+ if (!gd->baudrate)
	38	+ gd->baudrate = CONFIG_BAUDRATE;
	39	+
	40	+ arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1;
	41	+ writel(arc_console_baud & 0xff, &regs->baudl);
	42	+ writel((arc_console_baud & 0xff00) >> 8, &regs->baudh);
	43	+}
	44	+
	45	+static int arc_serial_init(void)
	46	+{
	47	+ regs = (struct arc_serial_regs *)CONFIG_ARC_UART_BASE;
	48	+ serial_setbrg();
	49	+ return 0;
	50	+}
	51	+
	52	+static void arc_serial_putc(const char c)
	53	+{
	54	+ if (c == '\n')
	55	+ arc_serial_putc('\r');
	56	+
	57	+ while (!(readl(&regs->status) & UART_TXEMPTY))
	58	+ ;
	59	+
	60	+ writel(c, &regs->data);
	61	+}
	62	+
	63	+static int arc_serial_tstc(void)
	64	+{
	65	+ return !(readl(&regs->status) & UART_RXEMPTY);
	66	+}
	67	+
	68	+static int arc_serial_getc(void)
	69	+{
	70	+ while (!arc_serial_tstc())
	71	+ ;
	72	+
	73	+ /* Check for overflow errors */
	74	+ if (readl(&regs->status) & UART_OVERFLOW_ERR)
	75	+ return 0;
	76	+
	77	+ return readl(&regs->data) & 0xFF;
	78	+}
	79	+
	80	+static void arc_serial_puts(const char *s)
	81	+{
	82	+ while (*s)
	83	+ arc_serial_putc(*s++);
	84	+}
	85	+
	86	+static struct serial_device arc_serial_drv = {
	87	+ .name = "arc_serial",
	88	+ .start = arc_serial_init,
	89	+ .stop = NULL,
	90	+ .setbrg = arc_serial_setbrg,
	91	+ .putc = arc_serial_putc,
	92	+ .puts = arc_serial_puts,
	93	+ .getc = arc_serial_getc,
	94	+ .tstc = arc_serial_tstc,
	95	+};
	96	+
	97	+void arc_serial_initialize(void)
	98	+{
	99	+ serial_register(&arc_serial_drv);
	100	+}
	101	+
	102	+__weak struct serial_device *default_serial_console(void)
	103	+{
	104	+ return &arc_serial_drv;
	105	+}