1/* 2 * Debugging macro for DaVinci 3 * 4 * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com> 5 * 6 * 2007 (c) MontaVista Software, Inc. This file is licensed under 7 * the terms of the GNU General Public License version 2. This program 8 * is licensed "as is" without any warranty of any kind, whether express 9 * or implied. 10 */ 11 12/* Modifications 13 * Jan 2009 Chaithrika U S Added senduart, busyuart, waituart 14 * macros, based on debug-8250.S file 15 * but using 32-bit accesses required for 16 * some davinci devices. 17 */ 18 19#include <linux/serial_reg.h> 20 21#include <asm/memory.h> 22 23#include <mach/serial.h> 24 25#define UART_SHIFT 2 26 27 .pushsection .data 28davinci_uart_phys: .word 0 29davinci_uart_virt: .word 0 30 .popsection 31 32 .macro addruart, rx, tmp 33 34 /* Use davinci_uart_phys/virt if already configured */ 3510: mrc p15, 0, \rx, c1, c0 36 tst \rx, #1 @ MMU enabled? 37 ldreq \rx, =__virt_to_phys(davinci_uart_phys) 38 ldrne \rx, =davinci_uart_virt 39 ldr \rx, [\rx] 40 cmp \rx, #0 @ is port configured? 41 bne 99f @ already configured 42 43 mrc p15, 0, \rx, c1, c0 44 tst \rx, #1 @ MMU enabled? 45 46 /* Copy uart phys address from decompressor uart info */ 47 ldreq \tmp, =__virt_to_phys(davinci_uart_phys) 48 ldrne \tmp, =davinci_uart_phys 49 ldreq \rx, =DAVINCI_UART_INFO 50 ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO) 51 ldr \rx, [\rx, #0] 52 str \rx, [\tmp] 53 54 /* Copy uart virt address from decompressor uart info */ 55 ldreq \tmp, =__virt_to_phys(davinci_uart_virt) 56 ldrne \tmp, =davinci_uart_virt 57 ldreq \rx, =DAVINCI_UART_INFO 58 ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO) 59 ldr \rx, [\rx, #4] 60 str \rx, [\tmp] 61 62 b 10b 6399: 64 .endm 65 66 .macro senduart,rd,rx 67 str \rd, [\rx, #UART_TX << UART_SHIFT] 68 .endm 69 70 .macro busyuart,rd,rx 711002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT] 72 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE 73 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE 74 bne 1002b 75 .endm 76 77 .macro waituart,rd,rx 78#ifdef FLOW_CONTROL 791001: ldr \rd, [\rx, #UART_MSR << UART_SHIFT] 80 tst \rd, #UART_MSR_CTS 81 beq 1001b 82#endif 83 .endm 84