| /* |
| * Debugging macro for DaVinci |
| * |
| * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com> |
| * |
| * 2007 (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 kind, whether express |
| * or implied. |
| */ |
| |
| /* Modifications |
| * Jan 2009 Chaithrika U S Added senduart, busyuart, waituart |
| * macros, based on debug-8250.S file |
| * but using 32-bit accesses required for |
| * some davinci devices. |
| */ |
| |
| #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, rp, rv |
| |
| /* Use davinci_uart_phys/virt if already configured */ |
| 10: mrc p15, 0, \rp, c1, c0 |
| tst \rp, #1 @ MMU enabled? |
| ldreq \rp, =__virt_to_phys(davinci_uart_phys) |
| ldrne \rp, =davinci_uart_phys |
| add \rv, \rp, #4 @ davinci_uart_virt |
| ldr \rp, [\rp, #0] |
| ldr \rv, [\rv, #0] |
| cmp \rp, #0 @ is port configured? |
| cmpne \rv, #0 |
| bne 99f @ already configured |
| |
| /* Check the debug UART address set in uncompress.h */ |
| mrc p15, 0, \rp, c1, c0 |
| tst \rp, #1 @ MMU enabled? |
| |
| /* Copy uart phys address from decompressor uart info */ |
| ldreq \rv, =__virt_to_phys(davinci_uart_phys) |
| ldrne \rv, =davinci_uart_phys |
| ldreq \rp, =DAVINCI_UART_INFO |
| ldrne \rp, =__phys_to_virt(DAVINCI_UART_INFO) |
| ldr \rp, [\rp, #0] |
| str \rp, [\rv] |
| |
| /* Copy uart virt address from decompressor uart info */ |
| ldreq \rv, =__virt_to_phys(davinci_uart_virt) |
| ldrne \rv, =davinci_uart_virt |
| ldreq \rp, =DAVINCI_UART_INFO |
| ldrne \rp, =__phys_to_virt(DAVINCI_UART_INFO) |
| ldr \rp, [\rp, #4] |
| str \rp, [\rv] |
| |
| b 10b |
| 99: |
| .endm |
| |
| .macro senduart,rd,rx |
| str \rd, [\rx, #UART_TX << UART_SHIFT] |
| .endm |
| |
| .macro busyuart,rd,rx |
| 1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT] |
| and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| teq \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| bne 1002b |
| .endm |
| |
| .macro waituart,rd,rx |
| #ifdef FLOW_CONTROL |
| 1001: ldr \rd, [\rx, #UART_MSR << UART_SHIFT] |
| tst \rd, #UART_MSR_CTS |
| beq 1001b |
| #endif |
| .endm |
| |
