m68k: add DM model serial driver

Boards can now use DM serial driver, or still legacy mcf uart
driver version.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/serial/mcfuart.c

@@ -2,6 +2,9 @@
  * (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>
+ *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
@@ -11,9 +14,10 @@
  */
 
 #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>
 
@@ -21,91 +25,110 @@ DECLARE_GLOBAL_DATA_PTR;
 
 extern void uart_port_conf(int port);
 
-static int mcf_serial_init(void)
+static int mcf_serial_init_common(uart_t *uart, int port_idx, int baudrate)
 {
-	volatile uart_t *uart;
 	u32 counter;
 
-	uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
-
-	uart_port_conf(CONFIG_SYS_UART_PORT);
+	uart_port_conf(port_idx);
 
 	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
-	uart->ucr = UART_UCR_RESET_RX;
-	uart->ucr = UART_UCR_RESET_TX;
-	uart->ucr = UART_UCR_RESET_ERROR;
-	uart->ucr = UART_UCR_RESET_MR;
+	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");
 
-	uart->uimr = 0;
+	writeb(0, &uart->uimr);
 
 	/* write to CSR: RX/TX baud rate from timers */
-	uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);
+	writeb(UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK, &uart->ucsr);
 
-	uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
-	uart->umr = UART_UMR_SB_STOP_BITS_1;
+	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) + (gd->baudrate / 2));
-	counter = counter / gd->baudrate;
+	counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));
+	counter = counter / baudrate;
 
 	/* write to CTUR: divide counter upper byte */
-	uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
+	writeb((u8)((counter & 0xff00) >> 8), &uart->ubg1);
 	/* write to CTLR: divide counter lower byte */
-	uart->ubg2 = (u8) (counter & 0x00ff);
+	writeb((u8)(counter & 0x00ff), &uart->ubg2);
 
-	uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);
+	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);
+}
+
+#ifndef CONFIG_DM_SERIAL
+
+static int mcf_serial_init(void)
+{
+	uart_t *uart_base;
+	int port_idx;
+
+	uart_base = (uart_t *)CONFIG_SYS_UART_BASE;
+	port_idx = CONFIG_SYS_UART_PORT;
+
+	return mcf_serial_init_common(uart_base, port_idx, gd->baudrate);
+}
+
 static void mcf_serial_putc(const char c)
 {
-	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
+	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
 
 	if (c == '\n')
 		serial_putc('\r');
 
 	/* Wait for last character to go. */
-	while (!(uart->usr & UART_USR_TXRDY)) ;
+	while (!(readb(&uart->usr) & UART_USR_TXRDY))
+		;
 
-	uart->utb = c;
+	writeb(c, &uart->utb);
 }
 
 static int mcf_serial_getc(void)
 {
-	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
+	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
 
 	/* Wait for a character to arrive. */
-	while (!(uart->usr & UART_USR_RXRDY)) ;
-	return uart->urb;
-}
-
-static int mcf_serial_tstc(void)
-{
-	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
+	while (!(readb(&uart->usr) & UART_USR_RXRDY))
+		;
 
-	return (uart->usr & UART_USR_RXRDY);
+	return readb(&uart->urb);
 }
 
 static void mcf_serial_setbrg(void)
 {
-	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
-	u32 counter;
-
-	/* Setting up BaudRate */
-	counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2));
-	counter = counter / gd->baudrate;
+	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
 
-	/* write to CTUR: divide counter upper byte */
-	uart->ubg1 = ((counter & 0xff00) >> 8);
-	/* write to CTLR: divide counter lower byte */
-	uart->ubg2 = (counter & 0x00ff);
+	mcf_serial_setbrg_common(uart, gd->baudrate);
+}
 
-	uart->ucr = UART_UCR_RESET_RX;
-	uart->ucr = UART_UCR_RESET_TX;
+static int mcf_serial_tstc(void)
+{
+	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
 
-	uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
+	return readb(&uart->usr) & UART_USR_RXRDY;
 }
 
 static struct serial_device mcf_serial_drv = {
@@ -128,3 +151,80 @@ __weak struct serial_device *default_serial_console(void)
 {
 	return &mcf_serial_drv;
 }
+
+#endif
+
+#ifdef CONFIG_DM_SERIAL
+
+static int coldfire_serial_probe(struct udevice *dev)
+{
+	struct coldfire_serial_platdata *plat = dev->platdata;
+
+	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 const struct dm_serial_ops coldfire_serial_ops = {
+	.putc = coldfire_serial_putc,
+	.pending = coldfire_serial_pending,
+	.getc = coldfire_serial_getc,
+	.setbrg = coldfire_serial_setbrg,
+};
+
+U_BOOT_DRIVER(serial_coldfire) = {
+	.name = "serial_coldfire",
+	.id = UCLASS_SERIAL,
+	.probe = coldfire_serial_probe,
+	.ops = &coldfire_serial_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
+#endif

include/dm/platform_data/serial_coldfire.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2015  Angelo Dureghello <angelo@sysam.it>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __serial_coldfire_h
+#define __serial_coldfire_h
+
+/*
+ * struct coldfire_serial_platdata - information about a coldfire port
+ *
+ * @base:               Uart port base register address
+ * @port:               Uart port index, for cpu with pinmux for uart / gpio
+ * baudrtatre:          Uart port baudrate
+ */
+struct coldfire_serial_platdata {
+	unsigned long base;
+	int port;
+	int baudrate;
+};
+
+#endif /* __serial_coldfire_h */