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[Qemu-devel] [PATCH v5 06/13] xilinx_spips: Update striping to be big-en
From: |
Francisco Iglesias |
Subject: |
[Qemu-devel] [PATCH v5 06/13] xilinx_spips: Update striping to be big-endian bit order |
Date: |
Sun, 29 Oct 2017 11:13:36 +0100 |
Update striping functionality to be big-endian bit order and output even
bits into flash memory connected to the lower QSPI bus and odd bits into
the flash memory connected to the upper QSPI bus.
Signed-off-by: Francisco Iglesias <address@hidden>
---
hw/ssi/xilinx_spips.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c
index 559fa79..7accf5d 100644
--- a/hw/ssi/xilinx_spips.c
+++ b/hw/ssi/xilinx_spips.c
@@ -208,14 +208,14 @@ static void xilinx_spips_reset(DeviceState *d)
xilinx_spips_update_cs_lines(s);
}
-/* N way (num) in place bit striper. Lay out row wise bits (LSB to MSB)
+/* N way (num) in place bit striper. Lay out row wise bits (MSB to LSB)
* column wise (from element 0 to N-1). num is the length of x, and dir
* reverses the direction of the transform. Best illustrated by example:
* Each digit in the below array is a single bit (num == 3):
*
- * {{ 76543210, } ----- stripe (dir == false) -----> {{ FCheb630, }
- * { hgfedcba, } { GDAfc741, }
- * { HGFEDCBA, }} <---- upstripe (dir == true) ----- { HEBgda52, }}
+ * {{ 76543210, } ----- stripe (dir == false) -----> {{ 741gdaFC, }
+ * { hgfedcba, } { 630fcHEB, }
+ * { HGFEDCBA, }} <---- upstripe (dir == true) ----- { 52hebGDA, }}
*/
static inline void stripe8(uint8_t *x, int num, bool dir)
@@ -223,15 +223,15 @@ static inline void stripe8(uint8_t *x, int num, bool dir)
uint8_t r[num];
memset(r, 0, sizeof(uint8_t) * num);
int idx[2] = {0, 0};
- int bit[2] = {0, 0};
+ int bit[2] = {0, 7};
int d = dir;
for (idx[0] = 0; idx[0] < num; ++idx[0]) {
- for (bit[0] = 0; bit[0] < 8; ++bit[0]) {
- r[idx[d]] |= x[idx[!d]] & 1 << bit[!d] ? 1 << bit[d] : 0;
+ for (bit[0] = 7; bit[0] != -1; bit[0] += -1) {
+ r[idx[!d]] |= x[idx[d]] & 1 << bit[d] ? 1 << bit[!d] : 0;
idx[1] = (idx[1] + 1) % num;
if (!idx[1]) {
- bit[1]++;
+ bit[1] += -1;
}
}
}
@@ -266,8 +266,9 @@ static void xilinx_spips_flush_txfifo(XilinxSPIPS *s)
}
for (i = 0; i < num_effective_busses(s); ++i) {
+ int bus = num_effective_busses(s) - 1 - i;
DB_PRINT_L(debug_level, "tx = %02x\n", tx_rx[i]);
- tx_rx[i] = ssi_transfer(s->spi[i], (uint32_t)tx_rx[i]);
+ tx_rx[i] = ssi_transfer(s->spi[bus], (uint32_t)tx_rx[i]);
DB_PRINT_L(debug_level, "rx = %02x\n", tx_rx[i]);
}
--
2.9.3
- [Qemu-devel] [PATCH v5 00/13] Add support for the ZynqMP Generic QSPI, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 01/13] m25p80: Add support for continuous read out of RDSR and READ_FSR, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 02/13] m25p80: Add support for SST READ ID 0x90/0xAB commands, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 03/13] m25p80: Add support for BRRD/BRWR and BULK_ERASE (0x60), Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 04/13] m25p80: Add support for n25q512a11 and n25q512a13, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 05/13] xilinx_spips: Move FlashCMD, XilinxQSPIPS and XilinxSPIPSClass, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 06/13] xilinx_spips: Update striping to be big-endian bit order,
Francisco Iglesias <=
- [Qemu-devel] [PATCH v5 08/13] xilinx_spips: Make tx/rx_data_bytes more generic and reusable, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 07/13] xilinx_spips: Add support for RX discard and RX drain, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 10/13] xilinx_spips: Add support for 4 byte addresses in the LQSPI, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 11/13] xilinx_spips: Don't set TX FIFO UNDERFLOW at cmd done, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 09/13] xilinx_spips: Add support for zero pumping, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 12/13] xilinx_spips: Add support for the ZynqMP Generic QSPI, Francisco Iglesias, 2017/10/29
- [Qemu-devel] [PATCH v5 13/13] xlnx-zcu102: Add support for the ZynqMP QSPI, Francisco Iglesias, 2017/10/29