| Kevin Hilman | 7c6337e | 2007-04-30 19:37:19 +0100 | [diff] [blame] | 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 | |
| Chaithrika U S | 17eb157 | 2009-01-19 14:13:05 +0530 | [diff] [blame] | 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> |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 20 | |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 21 | #include <mach/serial.h> |
| 22 | |
| Chaithrika U S | 17eb157 | 2009-01-19 14:13:05 +0530 | [diff] [blame] | 23 | #define UART_SHIFT 2 |
| 24 | |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 25 | .pushsection .data |
| 26 | davinci_uart_phys: .word 0 |
| 27 | davinci_uart_virt: .word 0 |
| 28 | .popsection |
| 29 | |
| Nicolas Pitre | 639da5e | 2011-08-31 22:55:46 -0400 | [diff] [blame] | 30 | .macro addruart, rp, rv, tmp |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 31 | |
| 32 | /* Use davinci_uart_phys/virt if already configured */ |
| Nicolas Pitre | 67f462b2 | 2011-09-01 20:50:14 -0400 | [diff] [blame] | 33 | 10: adr \rp, 99f @ get effective addr of 99f |
| 34 | ldr \rv, [\rp] @ get absolute addr of 99f |
| 35 | sub \rv, \rv, \rp @ offset between the two |
| 36 | ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys |
| 37 | sub \tmp, \rp, \rv @ make it effective |
| 38 | ldr \rp, [\tmp, #0] @ davinci_uart_phys |
| 39 | ldr \rv, [\tmp, #4] @ davinci_uart_virt |
| Jeremy Kerr | 0ea1293 | 2010-07-06 18:30:06 +0800 | [diff] [blame] | 40 | cmp \rp, #0 @ is port configured? |
| 41 | cmpne \rv, #0 |
| Nicolas Pitre | 67f462b2 | 2011-09-01 20:50:14 -0400 | [diff] [blame] | 42 | bne 100f @ already configured |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 43 | |
| Jeremy Kerr | 0ea1293 | 2010-07-06 18:30:06 +0800 | [diff] [blame] | 44 | /* Check the debug UART address set in uncompress.h */ |
| Nicolas Pitre | e020fe3 | 2011-09-01 20:32:21 -0400 | [diff] [blame] | 45 | and \rp, pc, #0xff000000 |
| 46 | ldr \rv, =DAVINCI_UART_INFO_OFS |
| 47 | add \rp, \rp, \rv |
| 48 | |
| Nicolas Pitre | e020fe3 | 2011-09-01 20:32:21 -0400 | [diff] [blame] | 49 | /* Copy uart phys address from decompressor uart info */ |
| Nicolas Pitre | 67f462b2 | 2011-09-01 20:50:14 -0400 | [diff] [blame] | 50 | ldr \rv, [\rp, #0] |
| 51 | str \rv, [\tmp, #0] |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 52 | |
| 53 | /* Copy uart virt address from decompressor uart info */ |
| Nicolas Pitre | 67f462b2 | 2011-09-01 20:50:14 -0400 | [diff] [blame] | 54 | ldr \rv, [\rp, #4] |
| 55 | str \rv, [\tmp, #4] |
| Cyril Chemparathy | dc2eb76 | 2010-05-18 12:51:17 -0400 | [diff] [blame] | 56 | |
| 57 | b 10b |
| Nicolas Pitre | 67f462b2 | 2011-09-01 20:50:14 -0400 | [diff] [blame] | 58 | |
| 59 | .align |
| 60 | 99: .word . |
| 61 | .word davinci_uart_phys |
| 62 | .ltorg |
| 63 | |
| 64 | 100: |
| Kevin Hilman | 7c6337e | 2007-04-30 19:37:19 +0100 | [diff] [blame] | 65 | .endm |
| 66 | |
| Chaithrika U S | 17eb157 | 2009-01-19 14:13:05 +0530 | [diff] [blame] | 67 | .macro senduart,rd,rx |
| 68 | str \rd, [\rx, #UART_TX << UART_SHIFT] |
| 69 | .endm |
| 70 | |
| 71 | .macro busyuart,rd,rx |
| 72 | 1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT] |
| 73 | and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| 74 | teq \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| 75 | bne 1002b |
| 76 | .endm |
| 77 | |
| 78 | .macro waituart,rd,rx |
| 79 | #ifdef FLOW_CONTROL |
| 80 | 1001: ldr \rd, [\rx, #UART_MSR << UART_SHIFT] |
| 81 | tst \rd, #UART_MSR_CTS |
| 82 | beq 1001b |
| 83 | #endif |
| 84 | .endm |
| 85 | |