serial: mcfuart: renaming to a more appropriate name

All drivers seems to align now to serial_xxx maning, so, aligning
also this driver, to allow to be found easily.

Signed-off-by: Angelo Durgehello <angelo.dureghello@timesys.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/drivers/serial/serial_mcf.c b/drivers/serial/serial_mcf.c
new file mode 100644
index 0000000000..b599064b48
--- /dev/null
+++ b/drivers/serial/serial_mcf.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
+ *
+ * Modified to add device model (DM) support
+ * (C) Copyright 2015  Angelo Dureghello <angelo@sysam.it>
+ *
+ * Modified to add DM and fdt support, removed non DM code
+ * (C) Copyright 2018  Angelo Dureghello <angelo@sysam.it>
+ */
+
+/*
+ * Minimal serial functions needed to use one of the uart ports
+ * as serial console interface.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/platform_data/serial_coldfire.h>
+#include <serial.h>
+#include <linux/compiler.h>
+#include <asm/immap.h>
+#include <asm/uart.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+extern void uart_port_conf(int port);
+
+static int mcf_serial_init_common(uart_t *uart, int port_idx, int baudrate)
+{
+	u32 counter;
+
+	uart_port_conf(port_idx);
+
+	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
+	writeb(UART_UCR_RESET_RX, &uart->ucr);
+	writeb(UART_UCR_RESET_TX, &uart->ucr);
+	writeb(UART_UCR_RESET_ERROR, &uart->ucr);
+	writeb(UART_UCR_RESET_MR, &uart->ucr);
+	__asm__("nop");
+
+	writeb(0, &uart->uimr);
+
+	/* write to CSR: RX/TX baud rate from timers */
+	writeb(UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK, &uart->ucsr);
+
+	writeb(UART_UMR_BC_8 | UART_UMR_PM_NONE, &uart->umr);
+	writeb(UART_UMR_SB_STOP_BITS_1, &uart->umr);
+
+	/* Setting up BaudRate */
+	counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));
+	counter = counter / baudrate;
+
+	/* write to CTUR: divide counter upper byte */
+	writeb((u8)((counter & 0xff00) >> 8), &uart->ubg1);
+	/* write to CTLR: divide counter lower byte */
+	writeb((u8)(counter & 0x00ff), &uart->ubg2);
+
+	writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);
+
+	return (0);
+}
+
+static void mcf_serial_setbrg_common(uart_t *uart, int baudrate)
+{
+	u32 counter;
+
+	/* Setting up BaudRate */
+	counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));
+	counter = counter / baudrate;
+
+	/* write to CTUR: divide counter upper byte */
+	writeb(((counter & 0xff00) >> 8), &uart->ubg1);
+	/* write to CTLR: divide counter lower byte */
+	writeb((counter & 0x00ff), &uart->ubg2);
+
+	writeb(UART_UCR_RESET_RX, &uart->ucr);
+	writeb(UART_UCR_RESET_TX, &uart->ucr);
+
+	writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);
+}
+
+static int coldfire_serial_probe(struct udevice *dev)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+
+	plat->port = dev->seq;
+
+	return mcf_serial_init_common((uart_t *)plat->base,
+						plat->port, plat->baudrate);
+}
+
+static int coldfire_serial_putc(struct udevice *dev, const char ch)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+	uart_t *uart = (uart_t *)plat->base;
+
+	/* Wait for last character to go. */
+	if (!(readb(&uart->usr) & UART_USR_TXRDY))
+		return -EAGAIN;
+
+	writeb(ch, &uart->utb);
+
+	return 0;
+}
+
+static int coldfire_serial_getc(struct udevice *dev)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+	uart_t *uart = (uart_t *)(plat->base);
+
+	/* Wait for a character to arrive. */
+	if (!(readb(&uart->usr) & UART_USR_RXRDY))
+		return -EAGAIN;
+
+	return readb(&uart->urb);
+}
+
+int coldfire_serial_setbrg(struct udevice *dev, int baudrate)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+	uart_t *uart = (uart_t *)(plat->base);
+
+	mcf_serial_setbrg_common(uart, baudrate);
+
+	return 0;
+}
+
+static int coldfire_serial_pending(struct udevice *dev, bool input)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+	uart_t *uart = (uart_t *)(plat->base);
+
+	if (input)
+		return readb(&uart->usr) & UART_USR_RXRDY ? 1 : 0;
+	else
+		return readb(&uart->usr) & UART_USR_TXRDY ? 0 : 1;
+
+	return 0;
+}
+
+static int coldfire_ofdata_to_platdata(struct udevice *dev)
+{
+	struct coldfire_serial_platdata *plat = dev_get_platdata(dev);
+	fdt_addr_t addr_base;
+
+	addr_base = devfdt_get_addr(dev);
+	if (addr_base == FDT_ADDR_T_NONE)
+		return -ENODEV;
+
+	plat->base = (uint32_t)addr_base;
+	plat->baudrate = gd->baudrate;
+
+	return 0;
+}
+
+static const struct dm_serial_ops coldfire_serial_ops = {
+	.putc = coldfire_serial_putc,
+	.pending = coldfire_serial_pending,
+	.getc = coldfire_serial_getc,
+	.setbrg = coldfire_serial_setbrg,
+};
+
+static const struct udevice_id coldfire_serial_ids[] = {
+	{ .compatible = "fsl,mcf-uart" },
+	{ }
+};
+
+U_BOOT_DRIVER(serial_coldfire) = {
+	.name = "serial_coldfire",
+	.id = UCLASS_SERIAL,
+	.of_match = coldfire_serial_ids,
+	.ofdata_to_platdata = coldfire_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct coldfire_serial_platdata),
+	.probe = coldfire_serial_probe,
+	.ops = &coldfire_serial_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};