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spi: spi-fsl-dspi: Add support for XSPI mode registers

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This prepares for adding support for extended SPI mode (XSPI), by extending
the regmap with the extra SREX and CTAREx registers.

An additional register map is made for allowing 16 bit access to CMD and TX
FIFO of the PUSHR register separately, which is also needed for XSPI mode
support.

Signed-off-by: Esben Haabendal <eha@deif.com>
Acked-by: Martin Hundebøll <martin@geanix.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Esben Haabendal 2018-06-20 09:34:38 +02:00 committed by Mark Brown
parent 071db7a675
commit 58ba07ec79
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 61 additions and 2 deletions
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63
drivers/spi/spi-fsl-dspi.c
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@ -108,11 +108,21 @@
#define SPI_RXFR2 0x84
#define SPI_RXFR3 0x88
#define SPI_CTARE(x) (0x11c + (((x) & 0x3) * 4))
#define SPI_CTARE_FMSZE(x) (((x) & 0x1) << 16)
#define SPI_CTARE_DTCP(x) ((x) & 0x7ff)
#define SPI_SREX 0x13c
#define SPI_FRAME_BITS(bits) SPI_CTAR_FMSZ((bits) - 1)
#define SPI_FRAME_BITS_MASK SPI_CTAR_FMSZ(0xf)
#define SPI_FRAME_BITS_16 SPI_CTAR_FMSZ(0xf)
#define SPI_FRAME_BITS_8 SPI_CTAR_FMSZ(0x7)
/* Register offsets for regmap_pushr */
#define PUSHR_CMD 0x0
#define PUSHR_TX 0x2
#define SPI_CS_INIT 0x01
#define SPI_CS_ASSERT 0x02
#define SPI_CS_DROP 0x04
@ -133,6 +143,7 @@ enum dspi_trans_mode {
struct fsl_dspi_devtype_data {
enum dspi_trans_mode trans_mode;
u8 max_clock_factor;
bool xspi_mode;
};
static const struct fsl_dspi_devtype_data vf610_data = {
@ -143,6 +154,7 @@ static const struct fsl_dspi_devtype_data vf610_data = {
static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
.trans_mode = DSPI_TCFQ_MODE,
.max_clock_factor = 8,
.xspi_mode = true,
};
static const struct fsl_dspi_devtype_data ls2085a_data = {
@ -177,6 +189,7 @@ struct fsl_dspi {
struct platform_device *pdev;
struct regmap *regmap;
struct regmap *regmap_pushr;
int irq;
struct clk *clk;
@ -876,6 +889,35 @@ static const struct regmap_config dspi_regmap_config = {
.volatile_table = &dspi_volatile_table,
};
static const struct regmap_range dspi_xspi_volatile_ranges[] = {
regmap_reg_range(SPI_MCR, SPI_TCR),
regmap_reg_range(SPI_SR, SPI_SR),
regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
regmap_reg_range(SPI_SREX, SPI_SREX),
};
static const struct regmap_access_table dspi_xspi_volatile_table = {
.yes_ranges = dspi_xspi_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(dspi_xspi_volatile_ranges),
};
static const struct regmap_config dspi_xspi_regmap_config[] = {
{
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x13c,
.volatile_table = &dspi_xspi_volatile_table,
},
{
.name = "pushr",
.reg_bits = 16,
.val_bits = 16,
.reg_stride = 2,
.max_register = 0x2,
},
};
static void dspi_init(struct fsl_dspi *dspi)
{
regmap_write(dspi->regmap, SPI_MCR, SPI_MCR_MASTER | SPI_MCR_PCSIS);
@ -888,6 +930,7 @@ static int dspi_probe(struct platform_device *pdev)
struct spi_master *master;
struct fsl_dspi *dspi;
struct resource *res;
const struct regmap_config *regmap_config;
void __iomem *base;
struct fsl_dspi_platform_data *pdata;
int ret = 0, cs_num, bus_num;
@ -946,8 +989,11 @@ static int dspi_probe(struct platform_device *pdev)
goto out_master_put;
}
dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
&dspi_regmap_config);
if (dspi->devtype_data->xspi_mode)
regmap_config = &dspi_xspi_regmap_config[0];
else
regmap_config = &dspi_regmap_config;
dspi->regmap = devm_regmap_init_mmio(&pdev->dev, base, regmap_config);
if (IS_ERR(dspi->regmap)) {
dev_err(&pdev->dev, "failed to init regmap: %ld\n",
PTR_ERR(dspi->regmap));
@ -955,6 +1001,19 @@ static int dspi_probe(struct platform_device *pdev)
goto out_master_put;
}
if (dspi->devtype_data->xspi_mode) {
dspi->regmap_pushr = devm_regmap_init_mmio(
&pdev->dev, base + SPI_PUSHR,
&dspi_xspi_regmap_config[1]);
if (IS_ERR(dspi->regmap_pushr)) {
dev_err(&pdev->dev,
"failed to init pushr regmap: %ld\n",
PTR_ERR(dspi->regmap_pushr));
ret = PTR_ERR(dspi->regmap);
goto out_master_put;
}
}
dspi_init(dspi);
dspi->irq = platform_get_irq(pdev, 0);
if (dspi->irq < 0) {