ar71xx: adding u-boot for nbg460n

This adds u-boot for nbg460n ar71xx target,
as it is required as second stage bootloader.

Signed-off-by: Michael Kurz <michi.kurz@googlemail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24418 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 177 insertions, 0 deletions

diff --git a/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c b/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c
new file mode 100644
index 000000000..f09331895
--- /dev/null
+++ b/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c
@@ -0,0 +1,177 @@
+/*
+ * (C) Copyright 2010
+ * Michael Kurz <michi.kurz@googlemail.com>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <asm/addrspace.h>
+#include <asm/types.h>
+#include <config.h>
+#include <asm/ar71xx.h>
+
+#define		REG_SIZE		4
+
+/* === END OF CONFIG === */
+
+/* register offset */
+#define         OFS_RCV_BUFFER          (0*REG_SIZE)
+#define         OFS_TRANS_HOLD          (0*REG_SIZE)
+#define         OFS_SEND_BUFFER         (0*REG_SIZE)
+#define         OFS_INTR_ENABLE         (1*REG_SIZE)
+#define         OFS_INTR_ID             (2*REG_SIZE)
+#define         OFS_DATA_FORMAT         (3*REG_SIZE)
+#define         OFS_LINE_CONTROL        (3*REG_SIZE)
+#define         OFS_MODEM_CONTROL       (4*REG_SIZE)
+#define         OFS_RS232_OUTPUT        (4*REG_SIZE)
+#define         OFS_LINE_STATUS         (5*REG_SIZE)
+#define         OFS_MODEM_STATUS        (6*REG_SIZE)
+#define         OFS_RS232_INPUT         (6*REG_SIZE)
+#define         OFS_SCRATCH_PAD         (7*REG_SIZE)
+
+#define         OFS_DIVISOR_LSB         (0*REG_SIZE)
+#define         OFS_DIVISOR_MSB         (1*REG_SIZE)
+
+#define         UART16550_READ(y)   readl(KSEG1ADDR(AR71XX_UART_BASE+y))
+#define         UART16550_WRITE(x, z)  writel(z, KSEG1ADDR((AR71XX_UART_BASE+x)))
+
+void 
+ar71xx_sys_frequency(u32 *cpu_freq, u32 *ddr_freq, u32 *ahb_freq)
+{
+#ifndef CONFIG_AR91XX
+    u32 pll, pll_div, cpu_div, ahb_div, ddr_div, freq;
+
+    pll = readl(KSEG1ADDR(AR71XX_PLL_REG_CPU_CONFIG + AR71XX_PLL_BASE));
+
+    pll_div = 
+        ((pll & AR71XX_PLL_DIV_MASK) >> AR71XX_PLL_DIV_SHIFT) + 1;
+
+    cpu_div = 
+        ((pll & AR71XX_CPU_DIV_MASK) >> AR71XX_CPU_DIV_SHIFT) + 1;
+
+    ddr_div = 
+        ((pll & AR71XX_DDR_DIV_MASK) >> AR71XX_DDR_DIV_SHIFT) + 1;
+
+    ahb_div = 
+       (((pll & AR71XX_AHB_DIV_MASK) >> AR71XX_AHB_DIV_SHIFT) + 1)*2;
+
+    freq = pll_div * 40000000; 
+
+    if (cpu_freq)
+        *cpu_freq = freq/cpu_div;
+
+    if (ddr_freq)
+        *ddr_freq = freq/ddr_div;
+
+    if (ahb_freq)
+        *ahb_freq = (freq/cpu_div)/ahb_div;
+
+#else
+    u32 pll, pll_div, ahb_div, ddr_div, freq;
+
+    pll = readl(KSEG1ADDR(AR91XX_PLL_REG_CPU_CONFIG + AR71XX_PLL_BASE));
+
+    pll_div = 
+        ((pll & AR91XX_PLL_DIV_MASK) >> AR91XX_PLL_DIV_SHIFT);
+
+    ddr_div = 
+        ((pll & AR91XX_DDR_DIV_MASK) >> AR91XX_DDR_DIV_SHIFT) + 1;
+
+    ahb_div = 
+       (((pll & AR91XX_AHB_DIV_MASK) >> AR91XX_AHB_DIV_SHIFT) + 1)*2;
+
+    freq = pll_div * 5000000; 
+
+    if (cpu_freq)
+        *cpu_freq = freq;
+
+    if (ddr_freq)
+        *ddr_freq = freq/ddr_div;
+
+    if (ahb_freq)
+        *ahb_freq = freq/ahb_div;
+#endif
+}
+
+
+int serial_init(void)
+{
+    u32 div;
+    u32 ahb_freq = 100000000;
+
+    ar71xx_sys_frequency  (0, 0, &ahb_freq);  
+    div  = ahb_freq/(16 * CONFIG_BAUDRATE);  
+
+	// enable uart pins
+#ifndef CONFIG_AR91XX
+    writel(AR71XX_GPIO_FUNC_UART_EN, KSEG1ADDR(AR71XX_GPIO_BASE + GPIO_REG_FUNC));
+#else
+	writel(AR91XX_GPIO_FUNC_UART_EN, KSEG1ADDR(AR71XX_GPIO_BASE + GPIO_REG_FUNC));
+#endif
+
+    /* set DIAB bit */
+    UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
+
+    /* set divisor */
+    UART16550_WRITE(OFS_DIVISOR_LSB, (div & 0xff));
+    UART16550_WRITE(OFS_DIVISOR_MSB, ((div >> 8) & 0xff));
+
+    /* clear DIAB bit*/ 
+    UART16550_WRITE(OFS_LINE_CONTROL, 0x00);
+
+    /* set data format */
+    UART16550_WRITE(OFS_DATA_FORMAT, 0x3);
+
+    UART16550_WRITE(OFS_INTR_ENABLE, 0);
+
+	return 0;
+}
+
+int serial_tstc (void)
+{
+    return(UART16550_READ(OFS_LINE_STATUS) & 0x1);
+}
+
+int serial_getc(void)
+{
+    while(!serial_tstc());
+
+    return UART16550_READ(OFS_RCV_BUFFER);
+}
+
+
+void serial_putc(const char byte)
+{
+    if (byte == '\n') serial_putc ('\r');
+
+    while (((UART16550_READ(OFS_LINE_STATUS)) & 0x20) == 0x0);
+    UART16550_WRITE(OFS_SEND_BUFFER, byte);
+}
+
+void serial_setbrg (void)
+{
+}
+
+void serial_puts (const char *s)
+{
+	while (*s)
+	{
+		serial_putc (*s++);
+	}
+}