aboutsummaryrefslogtreecommitdiffstats
path: root/roms/u-boot/drivers/serial/serial_arc.c
diff options
context:
space:
mode:
authorAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
committerAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
commitaf1a266670d040d2f4083ff309d732d648afba2a (patch)
tree2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/drivers/serial/serial_arc.c
parente02cda008591317b1625707ff8e115a4841aa889 (diff)
Add submodule dependency filesHEADmaster
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/drivers/serial/serial_arc.c')
-rw-r--r--roms/u-boot/drivers/serial/serial_arc.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/serial/serial_arc.c b/roms/u-boot/drivers/serial/serial_arc.c
new file mode 100644
index 000000000..8f3e4dd44
--- /dev/null
+++ b/roms/u-boot/drivers/serial/serial_arc.c
@@ -0,0 +1,159 @@
+/*
+ * 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 <dm.h>
+#include <serial.h>
+#include <asm/global_data.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;
+};
+
+
+struct arc_serial_plat {
+ struct arc_serial_regs *reg;
+ unsigned int uartclk;
+};
+
+/* Bit definitions of STATUS register */
+#define UART_RXEMPTY (1 << 5)
+#define UART_OVERFLOW_ERR (1 << 1)
+#define UART_TXEMPTY (1 << 7)
+
+static int arc_serial_setbrg(struct udevice *dev, int baudrate)
+{
+ struct arc_serial_plat *plat = dev_get_plat(dev);
+ struct arc_serial_regs *const regs = plat->reg;
+ int arc_console_baud = gd->cpu_clk / (baudrate * 4) - 1;
+
+ writeb(arc_console_baud & 0xff, &regs->baudl);
+ writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+
+ return 0;
+}
+
+static int arc_serial_putc(struct udevice *dev, const char c)
+{
+ struct arc_serial_plat *plat = dev_get_plat(dev);
+ struct arc_serial_regs *const regs = plat->reg;
+
+ while (!(readb(&regs->status) & UART_TXEMPTY))
+ ;
+
+ writeb(c, &regs->data);
+
+ return 0;
+}
+
+static int arc_serial_tstc(struct arc_serial_regs *const regs)
+{
+ return !(readb(&regs->status) & UART_RXEMPTY);
+}
+
+static int arc_serial_pending(struct udevice *dev, bool input)
+{
+ struct arc_serial_plat *plat = dev_get_plat(dev);
+ struct arc_serial_regs *const regs = plat->reg;
+ uint32_t status = readb(&regs->status);
+
+ if (input)
+ return status & UART_RXEMPTY ? 0 : 1;
+ else
+ return status & UART_TXEMPTY ? 0 : 1;
+}
+
+static int arc_serial_getc(struct udevice *dev)
+{
+ struct arc_serial_plat *plat = dev_get_plat(dev);
+ struct arc_serial_regs *const regs = plat->reg;
+
+ while (!arc_serial_tstc(regs))
+ ;
+
+ /* Check for overflow errors */
+ if (readb(&regs->status) & UART_OVERFLOW_ERR)
+ return 0;
+
+ return readb(&regs->data) & 0xFF;
+}
+
+static int arc_serial_probe(struct udevice *dev)
+{
+ return 0;
+}
+
+static const struct dm_serial_ops arc_serial_ops = {
+ .putc = arc_serial_putc,
+ .pending = arc_serial_pending,
+ .getc = arc_serial_getc,
+ .setbrg = arc_serial_setbrg,
+};
+
+static const struct udevice_id arc_serial_ids[] = {
+ { .compatible = "snps,arc-uart" },
+ { }
+};
+
+static int arc_serial_of_to_plat(struct udevice *dev)
+{
+ struct arc_serial_plat *plat = dev_get_plat(dev);
+ DECLARE_GLOBAL_DATA_PTR;
+
+ plat->reg = dev_read_addr_ptr(dev);
+ plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+ "clock-frequency", 0);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(serial_arc) = {
+ .name = "serial_arc",
+ .id = UCLASS_SERIAL,
+ .of_match = arc_serial_ids,
+ .of_to_plat = arc_serial_of_to_plat,
+ .plat_auto = sizeof(struct arc_serial_plat),
+ .probe = arc_serial_probe,
+ .ops = &arc_serial_ops,
+};
+
+#ifdef CONFIG_DEBUG_ARC_SERIAL
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+ struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+ int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1;
+
+ writeb(arc_console_baud & 0xff, &regs->baudl);
+ writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+}
+
+static inline void _debug_uart_putc(int c)
+{
+ struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+
+ while (!(readb(&regs->status) & UART_TXEMPTY))
+ ;
+
+ writeb(c, &regs->data);
+}
+
+DEBUG_UART_FUNCS
+
+#endif