Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 109 insertions, 11 deletions

diff --git a/arch/arm/mach-tegra/include/mach/uncompress.h b/arch/arm/mach-tegra/include/mach/uncompress.h
index 4e8323770c79..5a440f315e57 100644
--- a/arch/arm/mach-tegra/include/mach/uncompress.h
+++ b/arch/arm/mach-tegra/include/mach/uncompress.h
@@ -2,10 +2,14 @@
  * arch/arm/mach-tegra/include/mach/uncompress.h
  *
  * Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ * Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
  *
  * Author:
  *	Colin Cross <ccross@google.com>
  *	Erik Gilling <konkers@google.com>
+ *	Doug Anderson <dianders@chromium.org>
+ *	Stephen Warren <swarren@nvidia.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -25,36 +29,130 @@
 #include <linux/serial_reg.h>
 
 #include <mach/iomap.h>
+#include <mach/irammap.h>
+
+#define BIT(x) (1 << (x))
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define DEBUG_UART_SHIFT 2
+
+volatile u8 *uart;
 
 static void putc(int c)
 {
-	volatile u8 *uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
-	int shift = 2;
-
 	if (uart == NULL)
 		return;
 
-	while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
+	while (!(uart[UART_LSR << DEBUG_UART_SHIFT] & UART_LSR_THRE))
 		barrier();
-	uart[UART_TX << shift] = c;
+	uart[UART_TX << DEBUG_UART_SHIFT] = c;
 }
 
 static inline void flush(void)
 {
 }
 
+static inline void save_uart_address(void)
+{
+	u32 *buf = (u32 *)(TEGRA_IRAM_BASE + TEGRA_IRAM_DEBUG_UART_OFFSET);
+
+	if (uart) {
+		buf[0] = TEGRA_IRAM_DEBUG_UART_COOKIE;
+		buf[1] = (u32)uart;
+	} else
+		buf[0] = 0;
+}
+
+/*
+ * Setup before decompression.  This is where we do UART selection for
+ * earlyprintk and init the uart_base register.
+ */
 static inline void arch_decomp_setup(void)
 {
-	volatile u8 *uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
-	int shift = 2;
+	static const struct {
+		u32 base;
+		u32 reset_reg;
+		u32 clock_reg;
+		u32 bit;
+	} uarts[] = {
+		{
+			TEGRA_UARTA_BASE,
+			TEGRA_CLK_RESET_BASE + 0x04,
+			TEGRA_CLK_RESET_BASE + 0x10,
+			6,
+		},
+		{
+			TEGRA_UARTB_BASE,
+			TEGRA_CLK_RESET_BASE + 0x04,
+			TEGRA_CLK_RESET_BASE + 0x10,
+			7,
+		},
+		{
+			TEGRA_UARTC_BASE,
+			TEGRA_CLK_RESET_BASE + 0x08,
+			TEGRA_CLK_RESET_BASE + 0x14,
+			23,
+		},
+		{
+			TEGRA_UARTD_BASE,
+			TEGRA_CLK_RESET_BASE + 0x0c,
+			TEGRA_CLK_RESET_BASE + 0x18,
+			1,
+		},
+		{
+			TEGRA_UARTE_BASE,
+			TEGRA_CLK_RESET_BASE + 0x0c,
+			TEGRA_CLK_RESET_BASE + 0x18,
+			2,
+		},
+	};
+	int i;
+	volatile u32 *apb_misc = (volatile u32 *)TEGRA_APB_MISC_BASE;
+	u32 chip, div;
+
+	/*
+	 * Look for the first UART that:
+	 * a) Is not in reset.
+	 * b) Is clocked.
+	 * c) Has a 'D' in the scratchpad register.
+	 *
+	 * Note that on Tegra30, the first two conditions are required, since
+	 * if not true, accesses to the UART scratch register will hang.
+	 * Tegra20 doesn't have this issue.
+	 *
+	 * The intent is that the bootloader will tell the kernel which UART
+	 * to use by setting up those conditions. If nothing found, we'll fall
+	 * back to what's specified in TEGRA_DEBUG_UART_BASE.
+	 */
+	for (i = 0; i < ARRAY_SIZE(uarts); i++) {
+		if (*(u8 *)uarts[i].reset_reg & BIT(uarts[i].bit))
+			continue;
 
+		if (!(*(u8 *)uarts[i].clock_reg & BIT(uarts[i].bit)))
+			continue;
+
+		uart = (volatile u8 *)uarts[i].base;
+		if (uart[UART_SCR << DEBUG_UART_SHIFT] != 'D')
+			continue;
+
+		break;
+	}
+	if (i == ARRAY_SIZE(uarts))
+		uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
+	save_uart_address();
 	if (uart == NULL)
 		return;
 
-	uart[UART_LCR << shift] |= UART_LCR_DLAB;
-	uart[UART_DLL << shift] = 0x75;
-	uart[UART_DLM << shift] = 0x0;
-	uart[UART_LCR << shift] = 3;
+	chip = (apb_misc[0x804 / 4] >> 8) & 0xff;
+	if (chip == 0x20)
+		div = 0x0075;
+	else
+		div = 0x00dd;
+
+	uart[UART_LCR << DEBUG_UART_SHIFT] |= UART_LCR_DLAB;
+	uart[UART_DLL << DEBUG_UART_SHIFT] = div & 0xff;
+	uart[UART_DLM << DEBUG_UART_SHIFT] = div >> 8;
+	uart[UART_LCR << DEBUG_UART_SHIFT] = 3;
 }
 
 static inline void arch_decomp_wdog(void)