Support for LinkStation / KuroBox HD and HG PPC models

This patch is based on the port by Mihai Georgian (see linkstation.c for
Copyright information) and implements support for LinkStation / KuroBox HD
and HG PPC models from Buffalo Technology, whereby HD is deactivated at
the moment, pending network driver fixing.

Notice to users: this is pretty much a barebone port. Support for network
on HG models is already in the U-Boot mainline, but you might also want
patches to switch fan / phy modes depending on the negotiated ethernet
parameters. This patch also doesn't support console switching, booting EM
mode, Buffalo specific ext2 magic number. So, if you want to use any of
those, you need additional patches. Otherwise this patche provides a fully
functional u-boot with a network console on your system.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>

1 files changed, 293 insertions, 0 deletions

diff --git a/board/linkstation/avr.c b/board/linkstation/avr.c
new file mode 100644
index 000000000..68bc5450a
--- /dev/null
+++ b/board/linkstation/avr.c
@@ -0,0 +1,293 @@
+/*
+ * avr.c
+ *
+ * AVR functions
+ *
+ * Copyright (C) 2006 Mihai Georgian <u-boot@linuxnotincluded.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <ns16550.h>
+#include <console.h>
+
+/* Button codes from the AVR */
+#define PWRR			0x20		/* Power button release	*/
+#define PWRP			0x21		/* Power button push	*/
+#define RESR			0x22		/* Reset button release	*/
+#define RESP			0x23		/* Reset button push	*/
+#define AVRINIT			0x33		/* Init complete	*/
+#define AVRRESET		0x31		/* Reset request	*/
+
+/* LED commands */
+#define PWRBLINKSTRT		'['		/* Blink power LED	*/
+#define PWRBLINKSTOP		'Z'		/* Solid power LED	*/
+#define HDDLEDON		'W'		/* HDD LED on 		*/
+#define HDDLEDOFF		'V'		/* HDD LED off		*/
+#define HDDBLINKSTRT		'Y'		/* HDD LED start blink	*/
+#define HDDBLINKSTOP		'X'		/* HDD LED stop blink	*/
+
+/* Timings for LEDs blinking to show choice */
+#define PULSETIME		250		/* msecs		*/
+#define LONGPAUSE		(5 * PULSETIME)
+
+/* Button press times */
+#define PUSHHOLD		1000		/* msecs		*/
+#define NOBUTTON		(6 * (LONGPAUSE+PULSETIME))
+
+/* Boot and console choices */
+#define MAX_BOOT_CHOICE		3
+
+static char *consoles[] = {
+	"serial",
+#if defined(CONFIG_NETCONSOLE)
+	"nc",
+#endif
+};
+#define MAX_CONS_CHOICE 	(sizeof(consoles)/sizeof(char *))
+
+#if !defined(CONFIG_NETCONSOLE)
+#define DEF_CONS_CHOICE		0
+#else
+#define DEF_CONS_CHOICE		1
+#endif
+
+#define perror(fmt, args...) printf("%s: " fmt, __FUNCTION__ , ##args)
+
+extern void miconCntl_SendCmd(unsigned char dat);
+extern void miconCntl_DisWDT(void);
+
+static int boot_stop;
+
+static int boot_choice = 1;
+static int cons_choice = DEF_CONS_CHOICE;
+
+static char envbuffer[16];
+
+void init_AVR_DUART (void)
+{
+	NS16550_t AVR_port = (NS16550_t) CFG_NS16550_COM2;
+	int clock_divisor = CFG_NS16550_CLK / 16 / 9600;
+
+	/*
+	 * AVR port init sequence taken from
+	 * the original Linkstation init code
+	 * Normal U-Boot serial reinit doesn't
+	 * work because the AVR uses even parity
+	 */
+	AVR_port->lcr = 0x00;
+	AVR_port->ier = 0x00;
+	AVR_port->lcr = LCR_BKSE;
+	AVR_port->dll = clock_divisor & 0xff;
+	AVR_port->dlm = (clock_divisor >> 8) & 0xff;
+	AVR_port->lcr = LCR_WLS_8 | LCR_PEN | LCR_EPS;
+	AVR_port->mcr = 0x00;
+	AVR_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
+
+	miconCntl_DisWDT();
+
+	boot_stop = 0;
+	miconCntl_SendCmd(PWRBLINKSTRT);
+}
+
+static inline int avr_tstc(void)
+{
+	return (NS16550_tstc((NS16550_t)CFG_NS16550_COM2));
+}
+
+static inline char avr_getc(void)
+{
+	return (NS16550_getc((NS16550_t)CFG_NS16550_COM2));
+}
+
+static int push_timeout(char button_code)
+{
+	ulong push_start = get_timer(0);
+	while (get_timer(push_start) <= PUSHHOLD)
+		if (avr_tstc() && avr_getc() == button_code)
+			return 0;
+	return 1;
+}
+
+static void next_boot_choice(void)
+{
+	ulong return_start;
+	ulong pulse_start;
+	int on_times;
+	int button_on;
+	int led_state;
+	char c;
+
+	button_on = 0;
+	return_start = get_timer(0);
+
+	on_times = boot_choice;
+	led_state = 0;
+	miconCntl_SendCmd(HDDLEDOFF);
+	pulse_start = get_timer(0);
+
+	while (get_timer(return_start) <= NOBUTTON || button_on) {
+		if (avr_tstc()) {
+			c = avr_getc();
+			if (c == PWRP)
+				button_on = 1;
+			else if (c == PWRR) {
+				button_on = 0;
+				return_start = get_timer(0);
+				if (++boot_choice > MAX_BOOT_CHOICE)
+					boot_choice = 1;
+				sprintf(envbuffer, "bootcmd%d", boot_choice);
+				if (getenv(envbuffer)) {
+					sprintf(envbuffer, "run bootcmd%d", boot_choice);
+					setenv("bootcmd", envbuffer);
+				}
+				on_times = boot_choice;
+				led_state = 1;
+				miconCntl_SendCmd(HDDLEDON);
+				pulse_start = get_timer(0);
+			} else {
+				perror("Unexpected code: 0x%02X\n", c);
+			}
+		}
+		if (on_times && get_timer(pulse_start) > PULSETIME) {
+			if (led_state == 1) {
+				--on_times;
+				led_state = 0;
+				miconCntl_SendCmd(HDDLEDOFF);
+			} else {
+				led_state = 1;
+				miconCntl_SendCmd(HDDLEDON);
+			}
+			pulse_start = get_timer(0);
+		}
+		if (!on_times && get_timer(pulse_start) > LONGPAUSE) {
+			on_times = boot_choice;
+			led_state = 1;
+			miconCntl_SendCmd(HDDLEDON);
+			pulse_start = get_timer(0);
+		}
+	}
+	if (led_state)
+		miconCntl_SendCmd(HDDLEDOFF);
+}
+
+void next_cons_choice(int console)
+{
+	ulong return_start;
+	ulong pulse_start;
+	int on_times;
+	int button_on;
+	int led_state;
+	char c;
+
+	button_on = 0;
+	cons_choice = console;
+	return_start = get_timer(0);
+
+	on_times = cons_choice+1;
+	led_state = 1;
+	miconCntl_SendCmd(HDDLEDON);
+	pulse_start = get_timer(0);
+
+	while (get_timer(return_start) <= NOBUTTON || button_on) {
+		if (avr_tstc()) {
+			c = avr_getc();
+			if (c == RESP)
+				button_on = 1;
+			else if (c == RESR) {
+				button_on = 0;
+				return_start = get_timer(0);
+				cons_choice = (cons_choice + 1) % MAX_CONS_CHOICE;
+				console_assign(stdin, consoles[cons_choice]);
+				console_assign(stdout, consoles[cons_choice]);
+				console_assign(stderr, consoles[cons_choice]);
+				on_times = cons_choice+1;
+				led_state = 0;
+				miconCntl_SendCmd(HDDLEDOFF);
+				pulse_start = get_timer(0);
+			} else {
+				perror("Unexpected code: 0x%02X\n", c);
+			}
+		}
+		if (on_times && get_timer(pulse_start) > PULSETIME) {
+			if (led_state == 0) {
+				--on_times;
+				led_state = 1;
+				miconCntl_SendCmd(HDDLEDON);
+			} else {
+				led_state = 0;
+				miconCntl_SendCmd(HDDLEDOFF);
+			}
+			pulse_start = get_timer(0);
+		}
+		if (!on_times && get_timer(pulse_start) > LONGPAUSE) {
+			on_times = cons_choice+1;
+			led_state = 0;
+			miconCntl_SendCmd(HDDLEDOFF);
+			pulse_start = get_timer(0);
+		}
+	}
+	if (led_state);
+	miconCntl_SendCmd(HDDLEDOFF);
+}
+
+int avr_input(void)
+{
+	char avr_button;
+
+	if (!avr_tstc())
+		return 0;
+
+	avr_button = avr_getc();
+	switch (avr_button) {
+	case PWRP:
+		if (push_timeout(PWRR)) {
+			/* Timeout before power button release */
+			boot_stop = ~boot_stop;
+			if (boot_stop)
+				miconCntl_SendCmd(PWRBLINKSTOP);
+			else
+				miconCntl_SendCmd(PWRBLINKSTRT);
+			/* Wait for power button release */
+			while (avr_getc() != PWRR)
+				;
+		} else
+			/* Power button released */
+			next_boot_choice();
+		break;
+	case RESP:
+		/* Wait for Reset button release */
+		while (avr_getc() != RESR)
+			;
+		next_cons_choice(cons_choice);
+		break;
+	case AVRINIT:
+		return 0;
+	default:
+		perror("Unexpected code: 0x%02X\n", avr_button);
+		return 0;
+	}
+	if (boot_stop)
+		return (-3);
+	else
+		return (-2);
+}
+
+void avr_StopBoot(void)
+{
+	boot_stop = ~0;
+	miconCntl_SendCmd(PWRBLINKSTOP);
+}