2  * (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
3  * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
8  * SPDX-License-Identifier:	GPL-2.0+
12  * Minimal serial functions needed to use one of the uart ports
22 #include <asm/uart.h>
28 static int mcf_serial_init_common(uart_t *uart, int port_idx, int baudrate)  in mcf_serial_init_common()  argument
34 	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */  in mcf_serial_init_common()
35 	writeb(UART_UCR_RESET_RX, &uart->ucr);  in mcf_serial_init_common()
36 	writeb(UART_UCR_RESET_TX, &uart->ucr);  in mcf_serial_init_common()
37 	writeb(UART_UCR_RESET_ERROR, &uart->ucr);  in mcf_serial_init_common()
38 	writeb(UART_UCR_RESET_MR, &uart->ucr);  in mcf_serial_init_common()
41 	writeb(0, &uart->uimr);  in mcf_serial_init_common()
44 	writeb(UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK, &uart->ucsr);  in mcf_serial_init_common()
46 	writeb(UART_UMR_BC_8 | UART_UMR_PM_NONE, &uart->umr);  in mcf_serial_init_common()
47 	writeb(UART_UMR_SB_STOP_BITS_1, &uart->umr);  in mcf_serial_init_common()
50 	counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));  in mcf_serial_init_common()
54 	writeb((u8)((counter & 0xff00) >> 8), &uart->ubg1);  in mcf_serial_init_common()
56 	writeb((u8)(counter & 0x00ff), &uart->ubg2);  in mcf_serial_init_common()
58 	writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);  in mcf_serial_init_common()
63 static void mcf_serial_setbrg_common(uart_t *uart, int baudrate)  in mcf_serial_setbrg_common()  argument
68 	counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));  in mcf_serial_setbrg_common()
72 	writeb(((counter & 0xff00) >> 8), &uart->ubg1);  in mcf_serial_setbrg_common()
74 	writeb((counter & 0x00ff), &uart->ubg2);  in mcf_serial_setbrg_common()
76 	writeb(UART_UCR_RESET_RX, &uart->ucr);  in mcf_serial_setbrg_common()
77 	writeb(UART_UCR_RESET_TX, &uart->ucr);  in mcf_serial_setbrg_common()
79 	writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);  in mcf_serial_setbrg_common()
92 	return mcf_serial_init_common(uart_base, port_idx, gd->baudrate);  in mcf_serial_init()
97 	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;  in mcf_serial_putc()  local
103 	while (!(readb(&uart->usr) & UART_USR_TXRDY))  in mcf_serial_putc()
106 	writeb(c, &uart->utb);  in mcf_serial_putc()
111 	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;  in mcf_serial_getc()  local
114 	while (!(readb(&uart->usr) & UART_USR_RXRDY))  in mcf_serial_getc()
117 	return readb(&uart->urb);  in mcf_serial_getc()
122 	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;  in mcf_serial_setbrg()  local
124 	mcf_serial_setbrg_common(uart, gd->baudrate);  in mcf_serial_setbrg()
129 	uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;  in mcf_serial_tstc()  local
131 	return readb(&uart->usr) & UART_USR_RXRDY;  in mcf_serial_tstc()
161 	struct coldfire_serial_platdata *plat = dev->platdata;  in coldfire_serial_probe()
163 	return mcf_serial_init_common((uart_t *)plat->base,  in coldfire_serial_probe()
164 						plat->port, plat->baudrate);  in coldfire_serial_probe()
169 	struct coldfire_serial_platdata *plat = dev->platdata;  in coldfire_serial_putc()
170 	uart_t *uart = (uart_t *)plat->base;  in coldfire_serial_putc()  local
173 	if (!(readb(&uart->usr) & UART_USR_TXRDY))  in coldfire_serial_putc()
174 		return -EAGAIN;  in coldfire_serial_putc()
176 	writeb(ch, &uart->utb);  in coldfire_serial_putc()
183 	struct coldfire_serial_platdata *plat = dev->platdata;  in coldfire_serial_getc()
184 	uart_t *uart = (uart_t *)(plat->base);  in coldfire_serial_getc()  local
187 	if (!(readb(&uart->usr) & UART_USR_RXRDY))  in coldfire_serial_getc()
188 		return -EAGAIN;  in coldfire_serial_getc()
190 	return readb(&uart->urb);  in coldfire_serial_getc()
195 	struct coldfire_serial_platdata *plat = dev->platdata;  in coldfire_serial_setbrg()
196 	uart_t *uart = (uart_t *)(plat->base);  in coldfire_serial_setbrg()  local
198 	mcf_serial_setbrg_common(uart, baudrate);  in coldfire_serial_setbrg()
205 	struct coldfire_serial_platdata *plat = dev->platdata;  in coldfire_serial_pending()
206 	uart_t *uart = (uart_t *)(plat->base);  in coldfire_serial_pending()  local
209 		return readb(&uart->usr) & UART_USR_RXRDY ? 1 : 0;  in coldfire_serial_pending()
211 		return readb(&uart->usr) & UART_USR_TXRDY ? 0 : 1;  in coldfire_serial_pending()