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spi: bcm-qspi: add support for MSPI sys clk 108Mhz 

Adding support for MSPI sys clk 108Mhz available on 7216
and 7278 BRCMSTB SoCs.

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Link: https://lore.kernel.org/r/20200420190853.45614-9-kdasu.kdev@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kamal Dasu 2020-04-20 15:08:52 -04:00 committed by Mark Brown
parent d9576ae5dc
commit 43613a77b8
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 44 additions and 0 deletions
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44
drivers/spi/spi-bcm-qspi.c
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@ -109,6 +109,11 @@
#define MSPI_SPCR3_FASTBR BIT(0)
#define MSPI_SPCR3_FASTDT BIT(1)
#define MSPI_SPCR3_SYSCLKSEL_MASK GENMASK(11, 10)
#define MSPI_SPCR3_SYSCLKSEL_27 (MSPI_SPCR3_SYSCLKSEL_MASK & \
~(BIT(10) | BIT(11)))
#define MSPI_SPCR3_SYSCLKSEL_108 (MSPI_SPCR3_SYSCLKSEL_MASK & \
BIT(11))
#define MSPI_MSPI_STATUS_SPIF BIT(0)
@ -117,6 +122,7 @@
#define NUM_CHIPSELECT 4
#define QSPI_SPBR_MAX 255U
#define MSPI_BASE_FREQ 27000000UL
#define OPCODE_DIOR 0xBB
#define OPCODE_QIOR 0xEB
@ -222,6 +228,7 @@ struct bcm_qspi {
struct completion bspi_done;
u8 mspi_maj_rev;
u8 mspi_min_rev;
bool mspi_spcr3_sysclk;
};
static inline bool has_bspi(struct bcm_qspi *qspi)
@ -240,6 +247,17 @@ static inline bool bcm_qspi_has_fastbr(struct bcm_qspi *qspi)
return false;
}
/* hardware supports sys clk 108Mhz */
static inline bool bcm_qspi_has_sysclk_108(struct bcm_qspi *qspi)
{
if (!has_bspi(qspi) && (qspi->mspi_spcr3_sysclk ||
((qspi->mspi_maj_rev >= 1) &&
(qspi->mspi_min_rev >= 6))))
return true;
return false;
}
static inline int bcm_qspi_spbr_min(struct bcm_qspi *qspi)
{
if (bcm_qspi_has_fastbr(qspi))
@ -570,6 +588,15 @@ static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi,
/* enable fastbr */
spcr |= MSPI_SPCR3_FASTBR;
if (bcm_qspi_has_sysclk_108(qspi)) {
/* SYSCLK_108 */
spcr |= MSPI_SPCR3_SYSCLKSEL_108;
qspi->base_clk = MSPI_BASE_FREQ * 4;
/* Change spbr as we changed sysclk */
bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, 4);
}
bcm_qspi_write(qspi, MSPI, MSPI_SPCR3, spcr);
}
@ -1224,14 +1251,22 @@ static const struct spi_controller_mem_ops bcm_qspi_mem_ops = {
struct bcm_qspi_data {
bool has_mspi_rev;
bool has_spcr3_sysclk;
};
static const struct bcm_qspi_data bcm_qspi_no_rev_data = {
.has_mspi_rev = false,
.has_spcr3_sysclk = false,
};
static const struct bcm_qspi_data bcm_qspi_rev_data = {
.has_mspi_rev = true,
.has_spcr3_sysclk = false,
};
static const struct bcm_qspi_data bcm_qspi_spcr3_data = {
.has_mspi_rev = true,
.has_spcr3_sysclk = true,
};
static const struct of_device_id bcm_qspi_of_match[] = {
@ -1251,6 +1286,14 @@ static const struct of_device_id bcm_qspi_of_match[] = {
.compatible = "brcm,spi-bcm-qspi",
.data = &bcm_qspi_rev_data,
},
{
.compatible = "brcm,spi-bcm7216-qspi",
.data = &bcm_qspi_spcr3_data,
},
{
.compatible = "brcm,spi-bcm7278-qspi",
.data = &bcm_qspi_spcr3_data,
},
{},
};
MODULE_DEVICE_TABLE(of, bcm_qspi_of_match);
@ -1424,6 +1467,7 @@ int bcm_qspi_probe(struct platform_device *pdev,
qspi->mspi_maj_rev = (rev >> 4) & 0xf;
qspi->mspi_min_rev = rev & 0xf;
qspi->mspi_spcr3_sysclk = data->has_spcr3_sysclk;
qspi->max_speed_hz = qspi->base_clk / (bcm_qspi_spbr_min(qspi) * 2);