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spi: dw: Add DWC SSI capability 

Currently DWC SSI core is supported by means of setting up the
core-specific update_cr0() callback. It isn't suitable for multiple
reasons. First of all having exported several methods doing the same thing
but for different chips makes the code harder to maintain. Secondly the
spi-dw-core driver exports the methods, then the spi-dw-mmio driver sets
the private data callback with one of them so to be called by the core
driver again. That makes the code logic too complicated. Thirdly using
callbacks for just updating the CR0 register is problematic, since in case
if the register needed to be updated from different parts of the code,
we'd have to create another callback (for instance the SPI device-specific
parameters don't need to be calculated each time the SPI transfer is
submitted, so it's better to pre-calculate the CR0 data at the SPI-device
setup stage).

So keeping all the above in mind let's discard the update_cr0() callbacks,
define a generic and static dw_spi_update_cr0() method and create the
DW_SPI_CAP_DWC_SSI capability, which when enabled would activate the
alternative CR0 register layout.

While at it add the comments to the code path of the normal DW APB SSI
controller setup to make the dw_spi_update_cr0() method looking coherent.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20201007235511.4935-3-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Serge Semin 2020-10-08 02:54:51 +03:00 committed by Mark Brown
parent f68fe8de36
commit d6bbd1193f
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 42 additions and 77 deletions
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84
drivers/spi/spi-dw-core.c
View File

@ -228,60 +228,56 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id)
return dws->transfer_handler(dws);
}
/* Configure CTRLR0 for DW_apb_ssi */
u32 dw_spi_update_cr0(struct spi_controller *master, struct spi_device *spi,
struct spi_transfer *transfer)
static void dw_spi_update_cr0(struct dw_spi *dws, struct spi_device *spi,
struct spi_transfer *transfer)
{
struct chip_data *chip = spi_get_ctldata(spi);
u32 cr0;
/* Default SPI mode is SCPOL = 0, SCPH = 0 */
cr0 = (transfer->bits_per_word - 1)
| (SSI_MOTO_SPI << SPI_FRF_OFFSET)
| ((((spi->mode & SPI_CPOL) ? 1 : 0) << SPI_SCOL_OFFSET) |
(((spi->mode & SPI_CPHA) ? 1 : 0) << SPI_SCPH_OFFSET) |
(((spi->mode & SPI_LOOP) ? 1 : 0) << SPI_SRL_OFFSET))
| (chip->tmode << SPI_TMOD_OFFSET);
return cr0;
}
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 */
/* CTRLR0[ 4/3: 0] Data Frame Size */
cr0 = (transfer->bits_per_word - 1);
/* CTRLR0[ 7: 6] Frame Format */
cr0 |= SSI_MOTO_SPI << DWC_SSI_CTRLR0_FRF_OFFSET;
if (!(dws->caps & DW_SPI_CAP_DWC_SSI)) {
/* CTRLR0[ 5: 4] Frame Format */
cr0 |= SSI_MOTO_SPI << SPI_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;
/*
* SPI mode (SCPOL|SCPH)
* CTRLR0[ 6] Serial Clock Phase
* CTRLR0[ 7] Serial Clock Polarity
*/
cr0 |= ((spi->mode & SPI_CPOL) ? 1 : 0) << SPI_SCOL_OFFSET;
cr0 |= ((spi->mode & SPI_CPHA) ? 1 : 0) << SPI_SCPH_OFFSET;
/* CTRLR0[11:10] Transfer Mode */
cr0 |= chip->tmode << DWC_SSI_CTRLR0_TMOD_OFFSET;
/* CTRLR0[11] Shift Register Loop */
cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << SPI_SRL_OFFSET;
/* CTRLR0[13] Shift Register Loop */
cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << DWC_SSI_CTRLR0_SRL_OFFSET;
/* CTRLR0[ 9:8] Transfer Mode */
cr0 |= chip->tmode << SPI_TMOD_OFFSET;
} else {
/* CTRLR0[ 7: 6] Frame Format */
cr0 |= SSI_MOTO_SPI << DWC_SSI_CTRLR0_FRF_OFFSET;
if (dws->caps & DW_SPI_CAP_KEEMBAY_MST)
cr0 |= DWC_SSI_CTRLR0_KEEMBAY_MST;
/*
* 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;
return cr0;
/* CTRLR0[13] Shift Register Loop */
cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << DWC_SSI_CTRLR0_SRL_OFFSET;
/* CTRLR0[11:10] Transfer Mode */
cr0 |= chip->tmode << DWC_SSI_CTRLR0_TMOD_OFFSET;
if (dws->caps & DW_SPI_CAP_KEEMBAY_MST)
cr0 |= DWC_SSI_CTRLR0_KEEMBAY_MST;
}
dw_writel(dws, DW_SPI_CTRLR0, 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)
@ -290,7 +286,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
struct chip_data *chip = spi_get_ctldata(spi);
u8 imask = 0;
u16 txlevel = 0;
u32 cr0;
int ret;
dws->dma_mapped = 0;
@ -319,8 +314,7 @@ static int dw_spi_transfer_one(struct spi_controller *master,
transfer->effective_speed_hz = dws->max_freq / chip->clk_div;
cr0 = dws->update_cr0(master, spi, transfer);
dw_writel(dws, DW_SPI_CTRLR0, cr0);
dw_spi_update_cr0(dws, spi, transfer);
/* Check if current transfer is a DMA transaction */
if (master->can_dma && master->can_dma(master, spi, transfer))

20
drivers/spi/spi-dw-mmio.c
View File

@ -110,9 +110,6 @@ static int dw_spi_mscc_init(struct platform_device *pdev,
dwsmmio->dws.set_cs = dw_spi_mscc_set_cs;
dwsmmio->priv = dwsmscc;
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0;
return 0;
}
@ -188,9 +185,6 @@ static int dw_spi_mscc_sparx5_init(struct platform_device *pdev,
dwsmmio->dws.set_cs = dw_spi_sparx5_set_cs;
dwsmmio->priv = dwsmscc;
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0;
return 0;
}
@ -199,18 +193,12 @@ static int dw_spi_alpine_init(struct platform_device *pdev,
{
dwsmmio->dws.caps = DW_SPI_CAP_CS_OVERRIDE;
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0;
return 0;
}
static int dw_spi_dw_apb_init(struct platform_device *pdev,
struct dw_spi_mmio *dwsmmio)
{
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0;
dw_spi_dma_setup_generic(&dwsmmio->dws);
return 0;
@ -219,8 +207,7 @@ static int dw_spi_dw_apb_init(struct platform_device *pdev,
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;
dwsmmio->dws.caps = DW_SPI_CAP_DWC_SSI;
dw_spi_dma_setup_generic(&dwsmmio->dws);
@ -230,10 +217,7 @@ static int dw_spi_dwc_ssi_init(struct platform_device *pdev,
static int dw_spi_keembay_init(struct platform_device *pdev,
struct dw_spi_mmio *dwsmmio)
{
dwsmmio->dws.caps = DW_SPI_CAP_KEEMBAY_MST;
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0_v1_01a;
dwsmmio->dws.caps = DW_SPI_CAP_KEEMBAY_MST | DW_SPI_CAP_DWC_SSI;
return 0;
}

6
drivers/spi/spi-dw-pci.c
View File

@ -48,9 +48,6 @@ static int spi_mid_init(struct dw_spi *dws)
iounmap(clk_reg);
/* Register hook to configure CTRLR0 */
dws->update_cr0 = dw_spi_update_cr0;
dw_spi_dma_setup_mfld(dws);
return 0;
@ -58,9 +55,6 @@ static int spi_mid_init(struct dw_spi *dws)
static int spi_generic_init(struct dw_spi *dws)
{
/* Register hook to configure CTRLR0 */
dws->update_cr0 = dw_spi_update_cr0;
dw_spi_dma_setup_generic(dws);
return 0;

9
drivers/spi/spi-dw.h
View File

@ -109,6 +109,7 @@ enum dw_ssi_type {
/* DW SPI capabilities */
#define DW_SPI_CAP_CS_OVERRIDE BIT(0)
#define DW_SPI_CAP_KEEMBAY_MST BIT(1)
#define DW_SPI_CAP_DWC_SSI BIT(2)
struct dw_spi;
struct dw_spi_dma_ops {
@ -136,8 +137,6 @@ struct dw_spi {
u16 bus_num;
u16 num_cs; /* supported slave numbers */
void (*set_cs)(struct spi_device *spi, bool enable);
u32 (*update_cr0)(struct spi_controller *master, struct spi_device *spi,
struct spi_transfer *transfer);
/* Current message transfer state info */
size_t len;
@ -255,12 +254,6 @@ extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
extern void dw_spi_remove_host(struct dw_spi *dws);
extern int dw_spi_suspend_host(struct dw_spi *dws);
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);
#ifdef CONFIG_SPI_DW_DMA