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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/mips/ath79/early_printk.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/mips/ath79/early_printk.c')
-rw-r--r--kernel/arch/mips/ath79/early_printk.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/kernel/arch/mips/ath79/early_printk.c b/kernel/arch/mips/ath79/early_printk.c
new file mode 100644
index 000000000..b955fafc5
--- /dev/null
+++ b/kernel/arch/mips/ath79/early_printk.c
@@ -0,0 +1,99 @@
+/*
+ * Atheros AR7XXX/AR9XXX SoC early printk support
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/serial_reg.h>
+#include <asm/addrspace.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ar933x_uart.h>
+
+static void (*_prom_putchar) (unsigned char);
+
+static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
+{
+ u32 t;
+
+ do {
+ t = __raw_readl(reg);
+ if ((t & mask) == val)
+ break;
+ } while (1);
+}
+
+static void prom_putchar_ar71xx(unsigned char ch)
+{
+ void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
+
+ prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
+ __raw_writel(ch, base + UART_TX * 4);
+ prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
+}
+
+static void prom_putchar_ar933x(unsigned char ch)
+{
+ void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
+
+ prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
+ AR933X_UART_DATA_TX_CSR);
+ __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG);
+ prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
+ AR933X_UART_DATA_TX_CSR);
+}
+
+static void prom_putchar_dummy(unsigned char ch)
+{
+ /* nothing to do */
+}
+
+static void prom_putchar_init(void)
+{
+ void __iomem *base;
+ u32 id;
+
+ base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
+ id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
+ id &= REV_ID_MAJOR_MASK;
+
+ switch (id) {
+ case REV_ID_MAJOR_AR71XX:
+ case REV_ID_MAJOR_AR7240:
+ case REV_ID_MAJOR_AR7241:
+ case REV_ID_MAJOR_AR7242:
+ case REV_ID_MAJOR_AR913X:
+ case REV_ID_MAJOR_AR9341:
+ case REV_ID_MAJOR_AR9342:
+ case REV_ID_MAJOR_AR9344:
+ case REV_ID_MAJOR_QCA9556:
+ case REV_ID_MAJOR_QCA9558:
+ _prom_putchar = prom_putchar_ar71xx;
+ break;
+
+ case REV_ID_MAJOR_AR9330:
+ case REV_ID_MAJOR_AR9331:
+ _prom_putchar = prom_putchar_ar933x;
+ break;
+
+ default:
+ _prom_putchar = prom_putchar_dummy;
+ break;
+ }
+}
+
+void prom_putchar(unsigned char ch)
+{
+ if (!_prom_putchar)
+ prom_putchar_init();
+
+ _prom_putchar(ch);
+}