diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_scsd_s.S')
| -rw-r--r-- | c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_scsd_s.S | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_scsd_s.S b/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_scsd_s.S deleted file mode 100644 index 5ae8fdd2b8..0000000000 --- a/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_scsd_s.S +++ /dev/null @@ -1,139 +0,0 @@ -@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ -@ io_scsd_s.s -@ -@ Hardware Routines for reading a Secure Digital card -@ using the SC SD -@ -@ Based on code supplied by Romman -@ -@ Copyright (c) 2006 Michael "Chishm" Chisholm -@ -@ Redistribution and use in source and binary forms, with or without modification, -@ are permitted provided that the following conditions are met: -@ -@ 1. Redistributions of source code must retain the above copyright notice, -@ this list of conditions and the following disclaimer. -@ 2. Redistributions in binary form must reproduce the above copyright notice, -@ this list of conditions and the following disclaimer in the documentation and/or -@ other materials provided with the distribution. -@ 3. The name of the author may not be used to endorse or promote products derived -@ from this software without specific prior written permission. -@ -@ THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED -@ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY -@ AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE -@ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -@ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, -@ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -@ -@ 2006-07-22 - Chishm -@ * First release of stable code -@ -@ 2006-08-19 - Chishm -@ * Added SuperCard Lite support -@ -@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ - - .align 4 - .arm - - .equ REG_SCSD_DATAWRITE, 0x09000000 - .equ BYTES_PER_READ, 0x200 - .equ SCSD_STS_BUSY, 0x100 - .equ BUSY_WAIT_TIMEOUT, 0x10000 - .equ FALSE, 0 - .equ TRUE, 1 - -@ bool _SCSD_writeData_s (u8 *data, u16* crc) - - .global _SCSD_writeData_s - -_SCSD_writeData_s: - stmfd r13!, {r4-r5} - mov r5, #BYTES_PER_READ - mov r2, #REG_SCSD_DATAWRITE - -@ Wait for a free data buffer on the SD card - mov r4, #BUSY_WAIT_TIMEOUT -_SCSD_writeData_busy_wait: - @ Test for timeout - subs r4, r4, #1 - moveq r0, #FALSE @ return false on failure - beq _SCSD_writeData_return - @ Check the busy bit of the status register - ldrh r3, [r2] - tst r3, #SCSD_STS_BUSY - beq _SCSD_writeData_busy_wait - - ldrh r3, [r2] @ extra clock - - mov r3, #0 @ start bit - strh r3,[r2] - -@ Check if the data buffer is aligned on a halfword boundary - tst r0, #1 - beq _SCSD_writeData_data_loop - -@ Used when the source data is unaligned -_SCSD_writeData_data_loop_unaligned: - ldrb r3, [r0], #1 - ldrb r4, [r0], #1 - orr r3, r3, r4, lsl #8 - stmia r2, {r3-r4} - subs r5, r5, #2 - bne _SCSD_writeData_data_loop_unaligned - b _SCSD_writeData_crc - -@ Write the data to the card -@ 4 halfwords are transmitted to the Supercard at once, for timing purposes -@ Only the first halfword needs to contain data for standard SuperCards -@ For the SuperCard Lite, the data is split into 4 nibbles, one per halfword -_SCSD_writeData_data_loop: - ldrh r3, [r0], #2 - -@ This bit added for SCLite. Notice that the shift is not the same as in -@ the original (buggy) code supplied by Romman - add r3, r3, r3, lsl #20 - mov r4, r3, lsr #8 - - stmia r2, {r3-r4} - - subs r5, r5, #2 - bne _SCSD_writeData_data_loop - -@ Send the data CRC -_SCSD_writeData_crc: - cmp r1, #0 - movne r0, r1 - movne r1, #0 - movne r5, #8 - bne _SCSD_writeData_data_loop - - mov r3, #0xff @ end bit - strh r3, [r2] - -@ Wait for the SD card to signal that it is finished recieving - mov r4, #BUSY_WAIT_TIMEOUT -_SCSD_writeData_finished_wait: - @ Test for timeout - subs r4, r4, #1 - moveq r0, #FALSE @ return false on failure - beq _SCSD_writeData_return - @ Check the busy bit of the status register - ldrh r3, [r2] - tst r3, #0x100 - bne _SCSD_writeData_finished_wait - -@ Send 8 more clocks, as required by the SD card - ldmia r2, {r3-r4} - -@ return true for success - mov r0, #TRUE - -_SCSD_writeData_return: - ldmfd r13!,{r4-r5} - bx r14 - |