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@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/spi/spi-dw-mmio.c | 10 ++++++++++
drivers/spi/spi-dw.c | 33 +++++++++++++++++++++++++++++++++
drivers/spi/spi-dw.h | 12 ++++++++++++
3 files changed, 55 insertions(+)
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index a52f75e22109..1df6f3deee2c 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -146,6 +146,15 @@ static int dw_spi_dw_apb_init(struct platform_device *pdev,
return 0;
}
+static int dw_spi_dwc_ssi_init(struct platform_device *pdev,
+ struct dw_spi_mmio *dwsmmio)
+{
+ /* Register hook to configure CTRLR0 */
+ dwsmmio->dws.update_cr0 = dw_spi_update_cr0_v1_01a;
+
+ return 0;
+}
+
static int dw_spi_mmio_probe(struct platform_device *pdev)
{
int (*init_func)(struct platform_device *pdev,
@@ -244,6 +253,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
{ .compatible = "mscc,jaguar2-spi", .data = dw_spi_mscc_jaguar2_init},
{ .compatible = "amazon,alpine-dw-apb-ssi", .data = dw_spi_alpine_init},
{ .compatible = "renesas,rzn1-spi", .data = dw_spi_dw_apb_init},
+ { .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init},
{ /* end of table */}
};
MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 4905457641ef..240a61b66a06 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -277,6 +277,39 @@ u32 dw_spi_update_cr0(struct spi_controller *master, struct spi_device *spi,
}
EXPORT_SYMBOL_GPL(dw_spi_update_cr0);
+/* Configure CTRLR0 for DWC_ssi */
+u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master,
+ struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct dw_spi *dws = spi_controller_get_devdata(master);
+ struct chip_data *chip = spi_get_ctldata(spi);
+ u32 cr0;
+
+ /* CTRLR0[ 4: 0] Data Frame Size */
+ cr0 = (transfer->bits_per_word - 1);
+
+ /* CTRLR0[ 7: 6] Frame Format */
+ cr0 |= chip->type << DWC_SSI_CTRLR0_FRF_OFFSET;
+
+ /*
+ * SPI mode (SCPOL|SCPH)
+ * CTRLR0[ 8] Serial Clock Phase
+ * CTRLR0[ 9] Serial Clock Polarity
+ */
+ cr0 |= ((spi->mode & SPI_CPOL) ? 1 : 0) << DWC_SSI_CTRLR0_SCPOL_OFFSET;
+ cr0 |= ((spi->mode & SPI_CPHA) ? 1 : 0) << DWC_SSI_CTRLR0_SCPH_OFFSET;
+
+ /* CTRLR0[11:10] Transfer Mode */
+ cr0 |= chip->tmode << DWC_SSI_CTRLR0_TMOD_OFFSET;
+
+ /* CTRLR0[13] Shift Register Loop */
+ cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << DWC_SSI_CTRLR0_SRL_OFFSET;
+
+ return cr0;
+}
+EXPORT_SYMBOL_GPL(dw_spi_update_cr0_v1_01a);
+
static int dw_spi_transfer_one(struct spi_controller *master,
struct spi_device *spi, struct spi_transfer *transfer)
{
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 2745a7e7405c..8fe724279d15 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -57,6 +57,15 @@
#define SPI_SRL_OFFSET 11
#define SPI_CFS_OFFSET 12
+/* Bit fields in CTRLR0 based on DWC_ssi_databook.pdf v1.01a */
+#define DWC_SSI_CTRLR0_SRL_OFFSET 13
+#define DWC_SSI_CTRLR0_TMOD_OFFSET 10
+#define DWC_SSI_CTRLR0_TMOD_MASK GENMASK(11, 10)
+#define DWC_SSI_CTRLR0_SCPOL_OFFSET 9
+#define DWC_SSI_CTRLR0_SCPH_OFFSET 8
+#define DWC_SSI_CTRLR0_FRF_OFFSET 6
+#define DWC_SSI_CTRLR0_DFS_OFFSET 0
+
/* Bit fields in SR, 7 bits */
#define SR_MASK 0x7f /* cover 7 bits */
#define SR_BUSY (1 << 0)
@@ -245,6 +254,9 @@ extern int dw_spi_resume_host(struct dw_spi *dws);
extern u32 dw_spi_update_cr0(struct spi_controller *master,
struct spi_device *spi,
struct spi_transfer *transfer);
+extern u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master,
+ struct spi_device *spi,
+ struct spi_transfer *transfer);
/* platform related setup */
extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */
--
2.17.1
