spi: pxa2xx: Default thresholds to PXA configuration

Most of the devices in the supported list have PXA configuration of FIFO. In
particularly Intel Medfield and Merrifield have bigger FIFO, than it's defined
for CE4100.

Split CE4100 in the similar way how it was done for Intel Quark, i.e. prefix
definitions by CE4100 and append necessary pieces of code to switch case
conditions.

We are on safe side since those bits are ignored on all LPSS IPs.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx.c

@@ -62,6 +62,13 @@ MODULE_ALIAS("platform:pxa2xx-spi");
 				| QUARK_X1000_SSCR1_TFT		\
 				| SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
 
+#define CE4100_SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
+				| SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
+				| SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
+				| SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
+				| CE4100_SSCR1_RFT | CE4100_SSCR1_TFT | SSCR1_MWDS \
+				| SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
+
 #define LPSS_GENERAL_REG_RXTO_HOLDOFF_DISABLE	BIT(24)
 #define LPSS_CS_CONTROL_SW_MODE			BIT(0)
 #define LPSS_CS_CONTROL_CS_HIGH			BIT(1)
@@ -175,6 +182,8 @@ static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data)
 	switch (drv_data->ssp_type) {
 	case QUARK_X1000_SSP:
 		return QUARK_X1000_SSCR1_CHANGE_MASK;
+	case CE4100_SSP:
+		return CE4100_SSCR1_CHANGE_MASK;
 	default:
 		return SSCR1_CHANGE_MASK;
 	}
@@ -186,6 +195,8 @@ pxa2xx_spi_get_rx_default_thre(const struct driver_data *drv_data)
 	switch (drv_data->ssp_type) {
 	case QUARK_X1000_SSP:
 		return RX_THRESH_QUARK_X1000_DFLT;
+	case CE4100_SSP:
+		return RX_THRESH_CE4100_DFLT;
 	default:
 		return RX_THRESH_DFLT;
 	}
@@ -199,6 +210,9 @@ static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
 	case QUARK_X1000_SSP:
 		mask = QUARK_X1000_SSSR_TFL_MASK;
 		break;
+	case CE4100_SSP:
+		mask = CE4100_SSSR_TFL_MASK;
+		break;
 	default:
 		mask = SSSR_TFL_MASK;
 		break;
@@ -216,6 +230,9 @@ static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
 	case QUARK_X1000_SSP:
 		mask = QUARK_X1000_SSCR1_RFT;
 		break;
+	case CE4100_SSP:
+		mask = CE4100_SSCR1_RFT;
+		break;
 	default:
 		mask = SSCR1_RFT;
 		break;
@@ -230,6 +247,9 @@ static void pxa2xx_spi_set_rx_thre(const struct driver_data *drv_data,
 	case QUARK_X1000_SSP:
 		*sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold);
 		break;
+	case CE4100_SSP:
+		*sccr1_reg |= CE4100_SSCR1_RxTresh(threshold);
+		break;
 	default:
 		*sccr1_reg |= SSCR1_RxTresh(threshold);
 		break;
@@ -590,6 +610,9 @@ static void reset_sccr1(struct driver_data *drv_data)
 	case QUARK_X1000_SSP:
 		sccr1_reg &= ~QUARK_X1000_SSCR1_RFT;
 		break;
+	case CE4100_SSP:
+		sccr1_reg &= ~CE4100_SSCR1_RFT;
+		break;
 	default:
 		sccr1_reg &= ~SSCR1_RFT;
 		break;
@@ -1220,6 +1243,11 @@ static int setup(struct spi_device *spi)
 		tx_hi_thres = 0;
 		rx_thres = RX_THRESH_QUARK_X1000_DFLT;
 		break;
+	case CE4100_SSP:
+		tx_thres = TX_THRESH_CE4100_DFLT;
+		tx_hi_thres = 0;
+		rx_thres = RX_THRESH_CE4100_DFLT;
+		break;
 	case LPSS_LPT_SSP:
 	case LPSS_BYT_SSP:
 	case LPSS_BSW_SSP:
@@ -1304,6 +1332,10 @@ static int setup(struct spi_device *spi)
 				   | (QUARK_X1000_SSCR1_TxTresh(tx_thres)
 				   & QUARK_X1000_SSCR1_TFT);
 		break;
+	case CE4100_SSP:
+		chip->threshold = (CE4100_SSCR1_RxTresh(rx_thres) & CE4100_SSCR1_RFT) |
+			(CE4100_SSCR1_TxTresh(tx_thres) & CE4100_SSCR1_TFT);
+		break;
 	default:
 		chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
 			(SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
@@ -1625,15 +1657,20 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 	pxa2xx_spi_write(drv_data, SSCR0, 0);
 	switch (drv_data->ssp_type) {
 	case QUARK_X1000_SSP:
-		tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT)
-		      | QUARK_X1000_SSCR1_TxTresh(TX_THRESH_QUARK_X1000_DFLT);
+		tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT) |
+		      QUARK_X1000_SSCR1_TxTresh(TX_THRESH_QUARK_X1000_DFLT);
 		pxa2xx_spi_write(drv_data, SSCR1, tmp);
 
 		/* using the Motorola SPI protocol and use 8 bit frame */
-		pxa2xx_spi_write(drv_data, SSCR0,
-				 QUARK_X1000_SSCR0_Motorola
-				 | QUARK_X1000_SSCR0_DataSize(8));
+		tmp = QUARK_X1000_SSCR0_Motorola | QUARK_X1000_SSCR0_DataSize(8);
+		pxa2xx_spi_write(drv_data, SSCR0, tmp);
 		break;
+	case CE4100_SSP:
+		tmp = CE4100_SSCR1_RxTresh(RX_THRESH_CE4100_DFLT) |
+		      CE4100_SSCR1_TxTresh(TX_THRESH_CE4100_DFLT);
+		pxa2xx_spi_write(drv_data, SSCR1, tmp);
+		tmp = SSCR0_SCR(2) | SSCR0_Motorola | SSCR0_DataSize(8);
+		pxa2xx_spi_write(drv_data, SSCR0, tmp);
 	default:
 		tmp = SSCR1_RxTresh(RX_THRESH_DFLT) |
 		      SSCR1_TxTresh(TX_THRESH_DFLT);

include/linux/pxa2xx_ssp.h

@@ -83,7 +83,6 @@
 #define SSSR_RFS	(1 << 6)	/* Receive FIFO Service Request */
 #define SSSR_ROR	(1 << 7)	/* Receive FIFO Overrun */
 
-#ifdef CONFIG_ARCH_PXA
 #define RX_THRESH_DFLT	8
 #define TX_THRESH_DFLT	8
 
@@ -95,19 +94,16 @@
 #define SSCR1_RFT	(0x00003c00)	/* Receive FIFO Threshold (mask) */
 #define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
 
-#else
-
-#define RX_THRESH_DFLT	2
-#define TX_THRESH_DFLT	2
+#define RX_THRESH_CE4100_DFLT	2
+#define TX_THRESH_CE4100_DFLT	2
 
-#define SSSR_TFL_MASK	(0x3 << 8)	/* Transmit FIFO Level mask */
-#define SSSR_RFL_MASK	(0x3 << 12)	/* Receive FIFO Level mask */
+#define CE4100_SSSR_TFL_MASK	(0x3 << 8)	/* Transmit FIFO Level mask */
+#define CE4100_SSSR_RFL_MASK	(0x3 << 12)	/* Receive FIFO Level mask */
 
-#define SSCR1_TFT	(0x000000c0)	/* Transmit FIFO Threshold (mask) */
-#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
-#define SSCR1_RFT	(0x00000c00)	/* Receive FIFO Threshold (mask) */
-#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
-#endif
+#define CE4100_SSCR1_TFT	(0x000000c0)	/* Transmit FIFO Threshold (mask) */
+#define CE4100_SSCR1_TxTresh(x) (((x) - 1) << 6)	/* level [1..4] */
+#define CE4100_SSCR1_RFT	(0x00000c00)	/* Receive FIFO Threshold (mask) */
+#define CE4100_SSCR1_RxTresh(x) (((x) - 1) << 10)	/* level [1..4] */
 
 /* QUARK_X1000 SSCR0 bit definition */
 #define QUARK_X1000_SSCR0_DSS	(0x1F)		/* Data Size Select (mask) */