This patch adopts a debug uart selection similar to the OMAP model. During
the boot process, the uncompress code determines the physical and virtual base
addresses of the board-specific debug uart. These addresses are then passed
on to the in-kernel debug macros through a small chunk of memory placed just
below the page tables (@0x80003ff8).
Signed-off-by: Cyril Chemparathy <cy...@ti.com>
Tested-by: Sandeep Paulraj <s-paul...@ti.com>
---
arch/arm/mach-davinci/include/mach/debug-macro.S | 51 +++++++++++---
arch/arm/mach-davinci/include/mach/serial.h | 13 ++++
arch/arm/mach-davinci/include/mach/uncompress.h | 80 ++++++++++++++++------
3 files changed, 112 insertions(+), 32 deletions(-)
diff --git a/arch/arm/mach-davinci/include/mach/debug-macro.S
b/arch/arm/mach-davinci/include/mach/debug-macro.S
index 3cd93a8..ac0fa02 100644
--- a/arch/arm/mach-davinci/include/mach/debug-macro.S
+++ b/arch/arm/mach-davinci/include/mach/debug-macro.S
@@ -17,22 +17,51 @@
*/
#include <linux/serial_reg.h>
+
+#include <asm/memory.h>
+
+#include <mach/serial.h>
+
#define UART_SHIFT 2
+ .pushsection .data
+davinci_uart_phys: .word 0
+davinci_uart_virt: .word 0
+ .popsection
+
.macro addruart, rx, tmp
+
+ /* Use davinci_uart_phys/virt if already configured */
+10: mrc p15, 0, \rx, c1, c0
+ tst \rx, #1 @ MMU enabled?
+ ldreq \rx, =__virt_to_phys(davinci_uart_phys)
+ ldrne \rx, =davinci_uart_virt
+ ldr \rx, [\rx]
+ cmp \rx, #0 @ is port configured?
+ bne 99f @ already configured
+
+ /* Copy uart phys address from decompressor uart info */
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
- moveq \rx, #0x01000000 @ physical base address
- movne \rx, #0xfe000000 @ virtual base
-#if defined(CONFIG_ARCH_DAVINCI_DA8XX) && defined(CONFIG_ARCH_DAVINCI_DMx)
-#error Cannot enable DaVinci and DA8XX platforms concurrently
-#elif defined(CONFIG_MACH_DAVINCI_DA830_EVM) || \
- defined(CONFIG_MACH_DAVINCI_DA850_EVM)
- orr \rx, \rx, #0x00d00000 @ physical base address
- orr \rx, \rx, #0x0000d000 @ of UART 2
-#else
- orr \rx, \rx, #0x00c20000 @ UART 0
-#endif
+ ldreq \tmp, =__virt_to_phys(davinci_uart_phys)
+ ldrne \tmp, =davinci_uart_phys
+ ldreq \rx, =DAVINCI_UART_INFO
+ ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
+ ldr \rx, [\rx, #0]
+ str \rx, [\tmp]
+
+ /* Copy uart virt address from decompressor uart info */
+ mrc p15, 0, \rx, c1, c0
+ tst \rx, #1 @ MMU enabled?
+ ldreq \tmp, =__virt_to_phys(davinci_uart_virt)
+ ldrne \tmp, =davinci_uart_virt
+ ldreq \rx, =DAVINCI_UART_INFO
+ ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
+ ldr \rx, [\rx, #4]
+ str \rx, [\tmp]
+
+ b 10b
+99:
.endm
.macro senduart,rd,rx
diff --git a/arch/arm/mach-davinci/include/mach/serial.h
b/arch/arm/mach-davinci/include/mach/serial.h
index a584697..8829dde 100644
--- a/arch/arm/mach-davinci/include/mach/serial.h
+++ b/arch/arm/mach-davinci/include/mach/serial.h
@@ -11,8 +11,19 @@
#ifndef __ASM_ARCH_SERIAL_H
#define __ASM_ARCH_SERIAL_H
+#include <asm/memory.h>
+
#include <mach/hardware.h>
+/*
+ * Stolen area that contains debug uart physical and virtual addresses. These
+ * addresses are filled in by the uncompress.h code, and are used by the debug
+ * macros in debug-macro.S.
+ *
+ * This area sits just below the page tables (see arch/arm/kernel/head.S).
+ */
+#define DAVINCI_UART_INFO (PHYS_OFFSET + 0x3ff8)
+
#define DAVINCI_MAX_NR_UARTS 3
#define DAVINCI_UART0_BASE (IO_PHYS + 0x20000)
#define DAVINCI_UART1_BASE (IO_PHYS + 0x20400)
@@ -27,11 +38,13 @@
#define UART_DM646X_SCR 0x10
#define UART_DM646X_SCR_TX_WATERMARK 0x08
+#ifndef __ASSEMBLY__
struct davinci_uart_config {
/* Bit field of UARTs present; bit 0 --> UART1 */
unsigned int enabled_uarts;
};
extern int davinci_serial_init(struct davinci_uart_config *);
+#endif
#endif /* __ASM_ARCH_SERIAL_H */
diff --git a/arch/arm/mach-davinci/include/mach/uncompress.h
b/arch/arm/mach-davinci/include/mach/uncompress.h
index 33796b4..20c23a3 100644
--- a/arch/arm/mach-davinci/include/mach/uncompress.h
+++ b/arch/arm/mach-davinci/include/mach/uncompress.h
@@ -1,8 +1,17 @@
/*
* Serial port stubs for kernel decompress status messages
*
- * Author: Anant Gole
- * (C) Copyright (C) 2006, Texas Instruments, Inc
+ * Initially based on:
+ * arch/arm/plat-omap/include/mach/uncompress.h
+ *
+ * Original copyrights follow.
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: Greg Lonnon <glon...@ridgerun.com>
+ *
+ * Rewritten by:
+ * Author: <sou...@mvista.com>
+ * 2004 (c) MontaVista Software, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
@@ -11,30 +20,17 @@
#include <linux/types.h>
#include <linux/serial_reg.h>
-#include <mach/serial.h>
#include <asm/mach-types.h>
-extern unsigned int __machine_arch_type;
+#include <mach/serial.h>
static u32 *uart;
-
-static u32 *get_uart_base(void)
-{
- if (__machine_arch_type == MACH_TYPE_DAVINCI_DA830_EVM ||
- __machine_arch_type == MACH_TYPE_DAVINCI_DA850_EVM)
- return (u32 *)DA8XX_UART2_BASE;
- else
- return (u32 *)DAVINCI_UART0_BASE;
-}
+static u32 *uart_info = (u32 *)(DAVINCI_UART_INFO);
/* PORT_16C550A, in polled non-fifo mode */
-
static void putc(char c)
{
- if (!uart)
- uart = get_uart_base();
-
while (!(uart[UART_LSR] & UART_LSR_THRE))
barrier();
uart[UART_TX] = c;
@@ -42,12 +38,54 @@ static void putc(char c)
static inline void flush(void)
{
- if (!uart)
- uart = get_uart_base();
-
while (!(uart[UART_LSR] & UART_LSR_THRE))
barrier();
}
-#define arch_decomp_setup()
+static inline void set_uart_info(u32 phys, void * __iomem virt)
+{
+ uart = (u32 *)phys;
+ uart_info[0] = phys;
+ uart_info[1] = (u32)virt;
+}
+
+#define _DEBUG_LL_ENTRY(machine, phys, virt) \
+ if (machine_is_##machine()) { \
+ set_uart_info(phys, virt); \
+ break; \
+ }
+
+#define DEBUG_LL_DAVINCI(machine, port) \
+ _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE, \
+ IO_ADDRESS(DAVINCI_UART##port##_BASE))
+
+#define DEBUG_LL_DA8XX(machine, port) \
+ _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE, \
+ IO_ADDRESS(DA8XX_UART##port##_BASE))
+
+static inline void __arch_decomp_setup(unsigned long arch_id)
+{
+ /*
+ * Initialize the port based on the machine ID from the bootloader.
+ * Note that we're using macros here instead of switch statement
+ * as machine_is functions are optimized out for the boards that
+ * are not selected.
+ */
+ do {
+ /* Davinci boards */
+ DEBUG_LL_DAVINCI(davinci_evm, 0);
+ DEBUG_LL_DAVINCI(sffsdr, 0);
+ DEBUG_LL_DAVINCI(neuros_osd2, 0);
+ DEBUG_LL_DAVINCI(davinci_dm355_evm, 0);
+ DEBUG_LL_DAVINCI(dm355_leopard, 0);
+ DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0);
+ DEBUG_LL_DAVINCI(davinci_dm365_evm, 0);
+
+ /* DA8xx boards */
+ DEBUG_LL_DA8XX(davinci_da830_evm, 2);
+ DEBUG_LL_DA8XX(davinci_da850_evm, 2);
+ } while (0);
+}
+
+#define arch_decomp_setup() __arch_decomp_setup(arch_id)
#define arch_decomp_wdog()
--
1.6.3.3
_______________________________________________
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
