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This patch adds initial support for DesignWare DWC_ssi soft IP. DWC_ssi is
the enhanced version of DW_apb_ssi, which is currently supported by this
driver. Their registers are same, but the bit fields of register CTRLR0
are different.
DWC_ssi has additional features compared to DW_apb_ssi. Major enhancements
in DWC_ssi are hyper bus protocol, boot mode support and advanced XIP
support. DWC_ssi is an AHB slave device, whilst DW_apb_ssi is an APB slave
device.
Register offset
DW_ssi DW_apb_ssi
CTRLR0 0x00 0x00
CTRLR1 0x04 0x04
SSIENR 0x08 0x08
MWCR 0x0c 0x0c
SER 0x10 0x10
BAUDR 0x14 0x14
TXFTLR 0x18 0x18
RXFTLR 0x1c 0x1c
TXFLR 0x20 0x20
RXFLR 0x24 0x24
SR 0x28 0x28
IMR 0x2c 0x2c
ISR 0x30 0x30
RISR 0x34 0x34
TXOICR 0x38 0x38
RXOICR 0x3c 0x3c
RXUICR 0x40 0x40
MSTICR 0x44 0x44
ICR 0x48 0x48
DMACR 0x4c 0x4c
DMATDLR 0x50 0x50
DMARDLR 0x54 0x54
IDR 0x58 0x58
SSI_VERSION_ID 0x5c 0x5c
DRx (0 to 35) 0x60+i*0x4 0x60+i*0x4
RX_SAMPLE_DLY 0xf0 0xf0
SPI_CTRLR0 0xf4 0xf4
TXD_DRIVE_EDGE 0xf8 0xf8
XIP_MODE_BITS 0xfc RSVD
Register configuration - CTRLR0
DW_ssi DW_apb_ssi
SPI_HYPERBUS_EN bit[24] NONE
SPI_FRF bit[23:22] bit[22:21]
DFS_32 NONE bit[20:16]
CFS bit[19:16] bit[15:12]
SSTE bit[14] bit[24]
SRL bit[13] bit[11]
SLV_OE bit[12] bit[10]
TMOD bit[11:10] bit[9:8]
SCPOL | SPHA bit[9:8] bit[7:6]
FRF bit[7:6] bit[5:4]
DFS bit[4:0] bit[3:0]
The documents used are
[1] DW_apb_ssi_databook.pdf version 4.01a (2016.10a).
[2] DWC_ssi_databook.pdf version 1.01a.
Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200505130618.554-4-wan.ahmad.zainie.wan.mohamad@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.