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Davinci: generalized debug macros
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 <cyril@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Cyril Chemparathy
Kevin Hilman
parent
7e27d6e778
commit
dc2eb76c40
@ -17,22 +17,50 @@
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*/
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#include <linux/serial_reg.h>
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#include <asm/memory.h>
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#include <mach/serial.h>
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#define UART_SHIFT 2
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.pushsection .data
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davinci_uart_phys: .word 0
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davinci_uart_virt: .word 0
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.popsection
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.macro addruart, rx, tmp
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/* Use davinci_uart_phys/virt if already configured */
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10: mrc p15, 0, \rx, c1, c0
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tst \rx, #1 @ MMU enabled?
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ldreq \rx, =__virt_to_phys(davinci_uart_phys)
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ldrne \rx, =davinci_uart_virt
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ldr \rx, [\rx]
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cmp \rx, #0 @ is port configured?
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bne 99f @ already configured
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mrc p15, 0, \rx, c1, c0
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tst \rx, #1 @ MMU enabled?
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moveq \rx, #0x01000000 @ physical base address
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movne \rx, #0xfe000000 @ virtual base
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#if defined(CONFIG_ARCH_DAVINCI_DA8XX) && defined(CONFIG_ARCH_DAVINCI_DMx)
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#error Cannot enable DaVinci and DA8XX platforms concurrently
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#elif defined(CONFIG_MACH_DAVINCI_DA830_EVM) || \
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defined(CONFIG_MACH_DAVINCI_DA850_EVM)
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orr \rx, \rx, #0x00d00000 @ physical base address
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orr \rx, \rx, #0x0000d000 @ of UART 2
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#else
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orr \rx, \rx, #0x00c20000 @ UART 0
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#endif
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/* Copy uart phys address from decompressor uart info */
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ldreq \tmp, =__virt_to_phys(davinci_uart_phys)
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ldrne \tmp, =davinci_uart_phys
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ldreq \rx, =DAVINCI_UART_INFO
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ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
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ldr \rx, [\rx, #0]
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str \rx, [\tmp]
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/* Copy uart virt address from decompressor uart info */
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ldreq \tmp, =__virt_to_phys(davinci_uart_virt)
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ldrne \tmp, =davinci_uart_virt
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ldreq \rx, =DAVINCI_UART_INFO
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ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
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ldr \rx, [\rx, #4]
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str \rx, [\tmp]
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b 10b
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99:
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.endm
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.macro senduart,rd,rx
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@ -11,8 +11,19 @@
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#ifndef __ASM_ARCH_SERIAL_H
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#define __ASM_ARCH_SERIAL_H
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#include <asm/memory.h>
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#include <mach/hardware.h>
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/*
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* Stolen area that contains debug uart physical and virtual addresses. These
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* addresses are filled in by the uncompress.h code, and are used by the debug
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* macros in debug-macro.S.
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*
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* This area sits just below the page tables (see arch/arm/kernel/head.S).
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*/
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#define DAVINCI_UART_INFO (PHYS_OFFSET + 0x3ff8)
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#define DAVINCI_UART0_BASE (IO_PHYS + 0x20000)
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#define DAVINCI_UART1_BASE (IO_PHYS + 0x20400)
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#define DAVINCI_UART2_BASE (IO_PHYS + 0x20800)
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@ -26,11 +37,13 @@
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#define UART_DM646X_SCR 0x10
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#define UART_DM646X_SCR_TX_WATERMARK 0x08
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#ifndef __ASSEMBLY__
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struct davinci_uart_config {
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/* Bit field of UARTs present; bit 0 --> UART1 */
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unsigned int enabled_uarts;
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};
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extern int davinci_serial_init(struct davinci_uart_config *);
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#endif
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#endif /* __ASM_ARCH_SERIAL_H */
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@ -1,8 +1,17 @@
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/*
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* Serial port stubs for kernel decompress status messages
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*
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* Author: Anant Gole
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* (C) Copyright (C) 2006, Texas Instruments, Inc
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* Initially based on:
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* arch/arm/plat-omap/include/mach/uncompress.h
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*
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* Original copyrights follow.
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*
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* Copyright (C) 2000 RidgeRun, Inc.
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* Author: Greg Lonnon <glonnon@ridgerun.com>
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*
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* Rewritten by:
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* Author: <source@mvista.com>
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* 2004 (c) MontaVista Software, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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@ -11,30 +20,17 @@
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#include <linux/types.h>
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#include <linux/serial_reg.h>
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#include <mach/serial.h>
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#include <asm/mach-types.h>
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extern unsigned int __machine_arch_type;
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#include <mach/serial.h>
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static u32 *uart;
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static u32 *get_uart_base(void)
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{
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if (__machine_arch_type == MACH_TYPE_DAVINCI_DA830_EVM ||
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__machine_arch_type == MACH_TYPE_DAVINCI_DA850_EVM)
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return (u32 *)DA8XX_UART2_BASE;
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else
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return (u32 *)DAVINCI_UART0_BASE;
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}
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static u32 *uart_info = (u32 *)(DAVINCI_UART_INFO);
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/* PORT_16C550A, in polled non-fifo mode */
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static void putc(char c)
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{
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if (!uart)
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uart = get_uart_base();
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while (!(uart[UART_LSR] & UART_LSR_THRE))
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barrier();
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uart[UART_TX] = c;
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@ -42,12 +38,54 @@ static void putc(char c)
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static inline void flush(void)
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{
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if (!uart)
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uart = get_uart_base();
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while (!(uart[UART_LSR] & UART_LSR_THRE))
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barrier();
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}
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#define arch_decomp_setup()
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static inline void set_uart_info(u32 phys, void * __iomem virt)
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{
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uart = (u32 *)phys;
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uart_info[0] = phys;
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uart_info[1] = (u32)virt;
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}
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#define _DEBUG_LL_ENTRY(machine, phys, virt) \
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if (machine_is_##machine()) { \
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set_uart_info(phys, virt); \
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break; \
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}
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#define DEBUG_LL_DAVINCI(machine, port) \
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_DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE, \
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IO_ADDRESS(DAVINCI_UART##port##_BASE))
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#define DEBUG_LL_DA8XX(machine, port) \
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_DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE, \
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IO_ADDRESS(DA8XX_UART##port##_BASE))
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static inline void __arch_decomp_setup(unsigned long arch_id)
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{
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/*
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* Initialize the port based on the machine ID from the bootloader.
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* Note that we're using macros here instead of switch statement
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* as machine_is functions are optimized out for the boards that
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* are not selected.
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*/
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do {
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/* Davinci boards */
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DEBUG_LL_DAVINCI(davinci_evm, 0);
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DEBUG_LL_DAVINCI(sffsdr, 0);
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DEBUG_LL_DAVINCI(neuros_osd2, 0);
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DEBUG_LL_DAVINCI(davinci_dm355_evm, 0);
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DEBUG_LL_DAVINCI(dm355_leopard, 0);
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DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0);
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DEBUG_LL_DAVINCI(davinci_dm365_evm, 0);
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/* DA8xx boards */
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DEBUG_LL_DA8XX(davinci_da830_evm, 2);
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DEBUG_LL_DA8XX(davinci_da850_evm, 2);
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} while (0);
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}
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#define arch_decomp_setup() __arch_decomp_setup(arch_id)
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#define arch_decomp_wdog()
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