ARM: tegra: simplify DEBUG_LL UART selection options

Delete CONFIG_TEGRA_DEBUG_UART_AUTO_SCRATCH; it's not useful any more:
* No upstream bootloader currently or will ever support this option.
* CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA is a much more direct alternative.

Merge the fixed and automatic UART selection menus into a single choice
for simplicity; now you either pick AUTO_ODMDATA or a single fixed UART,
rather than potentially having an AUTO option override whatever fixed
option was chosen.

Remove TEGRA_DEBUG_UART_NONE; if you don't want a Tegra DEBUG_LL UART,
simply don't turn on DEBUG_LL. NONE used to be the default option, so
pick AUTO_ODMDATA as the new default.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

4 files changed, 15 insertions, 96 deletions

diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 9ff6f6ea3617..97fcd16e2dab 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -58,11 +58,16 @@ config TEGRA_AHB
           perfomance parameters(priority, prefech size).
 
 choice
-        prompt "Default low-level debug console UART"
-        default TEGRA_DEBUG_UART_NONE
+        prompt "Low-level debug console UART"
 
-config TEGRA_DEBUG_UART_NONE
-        bool "None"
+config TEGRA_DEBUG_UART_AUTO_ODMDATA
+        bool "Via ODMDATA"
+        help
+          Automatically determines which UART to use for low-level debug based
+          on the ODMDATA value. This value is part of the BCT, and is written
+          to the boot memory device using nvflash, or other flashing tool.
+          When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
+          0/1/2/3/4 are UART A/B/C/D/E.
 
 config TEGRA_DEBUG_UARTA
         bool "UART-A"
@@ -81,33 +86,6 @@ config TEGRA_DEBUG_UARTE
 
 endchoice
 
-choice
-        prompt "Automatic low-level debug console UART"
-        default TEGRA_DEBUG_UART_AUTO_NONE
-
-config TEGRA_DEBUG_UART_AUTO_NONE
-        bool "None"
-
-config TEGRA_DEBUG_UART_AUTO_ODMDATA
-        bool "Via ODMDATA"
-        help
-          Automatically determines which UART to use for low-level debug based
-          on the ODMDATA value. This value is part of the BCT, and is written
-          to the boot memory device using nvflash, or other flashing tool.
-          When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
-          0/1/2/3/4 are UART A/B/C/D/E.
-
-config TEGRA_DEBUG_UART_AUTO_SCRATCH
-        bool "Via UART scratch register"
-        help
-          Automatically determines which UART to use for low-level debug based
-          on the UART scratch register value. Some bootloaders put ASCII 'D'
-          in this register when they initialize their own console UART output.
-          Using this option allows the kernel to automatically pick the same
-          UART.
-
-endchoice
-
 config TEGRA_EMC_SCALING_ENABLE
         bool "Enable scaling the memory frequency"
 
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 3e03e5f15c14..8b41e4c0d53f 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -44,14 +44,13 @@
  * kernel is loaded. The data is declared here rather than debug-macro.S so
  * that multiple inclusions of debug-macro.S point at the same data.
  */
-#define TEGRA_DEBUG_UART_OFFSET (TEGRA_DEBUG_UART_BASE & 0xFFFF)
 u32 tegra_uart_config[3] = {
         /* Debug UART initialization required */
         1,
         /* Debug UART physical address */
-        (u32)(IO_APB_PHYS + TEGRA_DEBUG_UART_OFFSET),
+        0,
         /* Debug UART virtual address */
-        (u32)(IO_APB_VIRT + TEGRA_DEBUG_UART_OFFSET),
+        0,
 };
 
 #ifdef CONFIG_OF
diff --git a/arch/arm/mach-tegra/include/mach/uncompress.h b/arch/arm/mach-tegra/include/mach/uncompress.h
index 27725750ca3e..4150c71c006f 100644
--- a/arch/arm/mach-tegra/include/mach/uncompress.h
+++ b/arch/arm/mach-tegra/include/mach/uncompress.h
@@ -139,51 +139,19 @@ int auto_odmdata(void)
 }
 #endif
 
-#ifdef CONFIG_TEGRA_DEBUG_UART_AUTO_SCRATCH
-int auto_scratch(void)
-{
-        int i;
-
-        /*
-         * 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 (!uart_clocked(i))
-                        continue;
-
-                uart = (volatile u8 *)uarts[i].base;
-                if (uart[UART_SCR << DEBUG_UART_SHIFT] != 'D')
-                        continue;
-
-                return i;
-        }
-
-        return -1;
-}
-#endif
-
 /*
  * 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)
 {
-        int uart_id, auto_uart_id;
+        int uart_id;
         volatile u32 *apb_misc = (volatile u32 *)TEGRA_APB_MISC_BASE;
         u32 chip, div;
 
-#if defined(CONFIG_TEGRA_DEBUG_UARTA)
+#if defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+        uart_id = auto_odmdata();
+#elif defined(CONFIG_TEGRA_DEBUG_UARTA)
         uart_id = 0;
 #elif defined(CONFIG_TEGRA_DEBUG_UARTB)
         uart_id = 1;
@@ -193,19 +161,7 @@ static inline void arch_decomp_setup(void)
         uart_id = 3;
 #elif defined(CONFIG_TEGRA_DEBUG_UARTE)
         uart_id = 4;
-#else
-        uart_id = -1;
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
-        auto_uart_id = auto_odmdata();
-#elif defined(CONFIG_TEGRA_DEBUG_UART_AUTO_SCRATCH)
-        auto_uart_id = auto_scratch();
-#else
-        auto_uart_id = -1;
 #endif
-        if (auto_uart_id != -1)
-                uart_id = auto_uart_id;
 
         if (uart_id < 0 || uart_id >= ARRAY_SIZE(uarts) ||
             !uart_clocked(uart_id))
diff --git a/arch/arm/mach-tegra/iomap.h b/arch/arm/mach-tegra/iomap.h
index 53151030a07d..db8be51cad80 100644
--- a/arch/arm/mach-tegra/iomap.h
+++ b/arch/arm/mach-tegra/iomap.h
@@ -261,20 +261,6 @@
 #define TEGRA_SDMMC4_BASE               0xC8000600
 #define TEGRA_SDMMC4_SIZE               SZ_512
 
-#if defined(CONFIG_TEGRA_DEBUG_UART_NONE)
-# define TEGRA_DEBUG_UART_BASE 0
-#elif defined(CONFIG_TEGRA_DEBUG_UARTA)
-# define TEGRA_DEBUG_UART_BASE TEGRA_UARTA_BASE
-#elif defined(CONFIG_TEGRA_DEBUG_UARTB)
-# define TEGRA_DEBUG_UART_BASE TEGRA_UARTB_BASE
-#elif defined(CONFIG_TEGRA_DEBUG_UARTC)
-# define TEGRA_DEBUG_UART_BASE TEGRA_UARTC_BASE
-#elif defined(CONFIG_TEGRA_DEBUG_UARTD)
-# define TEGRA_DEBUG_UART_BASE TEGRA_UARTD_BASE
-#elif defined(CONFIG_TEGRA_DEBUG_UARTE)
-# define TEGRA_DEBUG_UART_BASE TEGRA_UARTE_BASE
-#endif
-
 /* On TEGRA, many peripherals are very closely packed in
  * two 256MB io windows (that actually only use about 64KB
  * at the start of each).