omap: mcbsp: Drop SPI mode support

We haven't seen any use for the SPI API in McBSP driver over the years. More
over, Peter Ujfalusi <peter.ujfalusi@ti.com> noticed that SPI mode is not
even supported since OMAP2430 so it's very unlikely that we'll see any use
for it in the future either.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/mcbsp.h

@@ -353,38 +353,6 @@ typedef enum {
 	OMAP_MCBSP_WORD_32,
 } omap_mcbsp_word_length;
 
-typedef enum {
-	OMAP_MCBSP_CLK_RISING = 0,
-	OMAP_MCBSP_CLK_FALLING,
-} omap_mcbsp_clk_polarity;
-
-typedef enum {
-	OMAP_MCBSP_FS_ACTIVE_HIGH = 0,
-	OMAP_MCBSP_FS_ACTIVE_LOW,
-} omap_mcbsp_fs_polarity;
-
-typedef enum {
-	OMAP_MCBSP_CLK_STP_MODE_NO_DELAY = 0,
-	OMAP_MCBSP_CLK_STP_MODE_DELAY,
-} omap_mcbsp_clk_stp_mode;
-
-
-/******* SPI specific mode **********/
-typedef enum {
-	OMAP_MCBSP_SPI_MASTER = 0,
-	OMAP_MCBSP_SPI_SLAVE,
-} omap_mcbsp_spi_mode;
-
-struct omap_mcbsp_spi_cfg {
-	omap_mcbsp_spi_mode		spi_mode;
-	omap_mcbsp_clk_polarity		rx_clock_polarity;
-	omap_mcbsp_clk_polarity		tx_clock_polarity;
-	omap_mcbsp_fs_polarity		fsx_polarity;
-	u8				clk_div;
-	omap_mcbsp_clk_stp_mode		clk_stp_mode;
-	omap_mcbsp_word_length		word_length;
-};
-
 /* Platform specific configuration */
 struct omap_mcbsp_ops {
 	void (*request)(unsigned int);
@@ -504,14 +472,9 @@ u32 omap_mcbsp_recv_word(unsigned int id);
 
 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer, unsigned int length);
 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer, unsigned int length);
-int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word);
-int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 * word);
-
 
 /* McBSP functional clock source changing function */
 extern int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id);
-/* SPI specific API */
-void omap_mcbsp_set_spi_mode(unsigned int id, const struct omap_mcbsp_spi_cfg * spi_cfg);
 
 /* Polled read/write functions */
 int omap_mcbsp_pollread(unsigned int id, u16 * buf);

arch/arm/plat-omap/mcbsp.c

@@ -1175,147 +1175,6 @@ u32 omap_mcbsp_recv_word(unsigned int id)
 }
 EXPORT_SYMBOL(omap_mcbsp_recv_word);
 
-int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
-{
-	struct omap_mcbsp *mcbsp;
-	omap_mcbsp_word_length tx_word_length;
-	omap_mcbsp_word_length rx_word_length;
-	u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
-
-	if (!omap_mcbsp_check_valid_id(id)) {
-		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
-		return -ENODEV;
-	}
-	mcbsp = id_to_mcbsp_ptr(id);
-	tx_word_length = mcbsp->tx_word_length;
-	rx_word_length = mcbsp->rx_word_length;
-
-	if (tx_word_length != rx_word_length)
-		return -EINVAL;
-
-	/* First we wait for the transmitter to be ready */
-	spcr2 = MCBSP_READ(mcbsp, SPCR2);
-	while (!(spcr2 & XRDY)) {
-		spcr2 = MCBSP_READ(mcbsp, SPCR2);
-		if (attempts++ > 1000) {
-			/* We must reset the transmitter */
-			MCBSP_WRITE(mcbsp, SPCR2,
-				    MCBSP_READ_CACHE(mcbsp, SPCR2) & (~XRST));
-			udelay(10);
-			MCBSP_WRITE(mcbsp, SPCR2,
-				    MCBSP_READ_CACHE(mcbsp, SPCR2) | XRST);
-			udelay(10);
-			dev_err(mcbsp->dev, "McBSP%d transmitter not "
-				"ready\n", mcbsp->id);
-			return -EAGAIN;
-		}
-	}
-
-	/* Now we can push the data */
-	if (tx_word_length > OMAP_MCBSP_WORD_16)
-		MCBSP_WRITE(mcbsp, DXR2, word >> 16);
-	MCBSP_WRITE(mcbsp, DXR1, word & 0xffff);
-
-	/* We wait for the receiver to be ready */
-	spcr1 = MCBSP_READ(mcbsp, SPCR1);
-	while (!(spcr1 & RRDY)) {
-		spcr1 = MCBSP_READ(mcbsp, SPCR1);
-		if (attempts++ > 1000) {
-			/* We must reset the receiver */
-			MCBSP_WRITE(mcbsp, SPCR1,
-				    MCBSP_READ_CACHE(mcbsp, SPCR1) & (~RRST));
-			udelay(10);
-			MCBSP_WRITE(mcbsp, SPCR1,
-				    MCBSP_READ_CACHE(mcbsp, SPCR1) | RRST);
-			udelay(10);
-			dev_err(mcbsp->dev, "McBSP%d receiver not "
-				"ready\n", mcbsp->id);
-			return -EAGAIN;
-		}
-	}
-
-	/* Receiver is ready, let's read the dummy data */
-	if (rx_word_length > OMAP_MCBSP_WORD_16)
-		word_msb = MCBSP_READ(mcbsp, DRR2);
-	word_lsb = MCBSP_READ(mcbsp, DRR1);
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
-
-int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
-{
-	struct omap_mcbsp *mcbsp;
-	u32 clock_word = 0;
-	omap_mcbsp_word_length tx_word_length;
-	omap_mcbsp_word_length rx_word_length;
-	u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
-
-	if (!omap_mcbsp_check_valid_id(id)) {
-		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
-		return -ENODEV;
-	}
-
-	mcbsp = id_to_mcbsp_ptr(id);
-
-	tx_word_length = mcbsp->tx_word_length;
-	rx_word_length = mcbsp->rx_word_length;
-
-	if (tx_word_length != rx_word_length)
-		return -EINVAL;
-
-	/* First we wait for the transmitter to be ready */
-	spcr2 = MCBSP_READ(mcbsp, SPCR2);
-	while (!(spcr2 & XRDY)) {
-		spcr2 = MCBSP_READ(mcbsp, SPCR2);
-		if (attempts++ > 1000) {
-			/* We must reset the transmitter */
-			MCBSP_WRITE(mcbsp, SPCR2,
-				    MCBSP_READ_CACHE(mcbsp, SPCR2) & (~XRST));
-			udelay(10);
-			MCBSP_WRITE(mcbsp, SPCR2,
-				    MCBSP_READ_CACHE(mcbsp, SPCR2) | XRST);
-			udelay(10);
-			dev_err(mcbsp->dev, "McBSP%d transmitter not "
-				"ready\n", mcbsp->id);
-			return -EAGAIN;
-		}
-	}
-
-	/* We first need to enable the bus clock */
-	if (tx_word_length > OMAP_MCBSP_WORD_16)
-		MCBSP_WRITE(mcbsp, DXR2, clock_word >> 16);
-	MCBSP_WRITE(mcbsp, DXR1, clock_word & 0xffff);
-
-	/* We wait for the receiver to be ready */
-	spcr1 = MCBSP_READ(mcbsp, SPCR1);
-	while (!(spcr1 & RRDY)) {
-		spcr1 = MCBSP_READ(mcbsp, SPCR1);
-		if (attempts++ > 1000) {
-			/* We must reset the receiver */
-			MCBSP_WRITE(mcbsp, SPCR1,
-				    MCBSP_READ_CACHE(mcbsp, SPCR1) & (~RRST));
-			udelay(10);
-			MCBSP_WRITE(mcbsp, SPCR1,
-				    MCBSP_READ_CACHE(mcbsp, SPCR1) | RRST);
-			udelay(10);
-			dev_err(mcbsp->dev, "McBSP%d receiver not "
-				"ready\n", mcbsp->id);
-			return -EAGAIN;
-		}
-	}
-
-	/* Receiver is ready, there is something for us */
-	if (rx_word_length > OMAP_MCBSP_WORD_16)
-		word_msb = MCBSP_READ(mcbsp, DRR2);
-	word_lsb = MCBSP_READ(mcbsp, DRR1);
-
-	word[0] = (word_lsb | (word_msb << 16));
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
-
 /*
  * Simple DMA based buffer rx/tx routines.
  * Nothing fancy, just a single buffer tx/rx through DMA.
@@ -1449,79 +1308,6 @@ int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
 }
 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
 
-/*
- * SPI wrapper.
- * Since SPI setup is much simpler than the generic McBSP one,
- * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
- * Once this is done, you can call omap_mcbsp_start().
- */
-void omap_mcbsp_set_spi_mode(unsigned int id,
-				const struct omap_mcbsp_spi_cfg *spi_cfg)
-{
-	struct omap_mcbsp *mcbsp;
-	struct omap_mcbsp_reg_cfg mcbsp_cfg;
-
-	if (!omap_mcbsp_check_valid_id(id)) {
-		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
-		return;
-	}
-	mcbsp = id_to_mcbsp_ptr(id);
-
-	memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
-
-	/* SPI has only one frame */
-	mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
-	mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
-
-	/* Clock stop mode */
-	if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
-		mcbsp_cfg.spcr1 |= (1 << 12);
-	else
-		mcbsp_cfg.spcr1 |= (3 << 11);
-
-	/* Set clock parities */
-	if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
-		mcbsp_cfg.pcr0 |= CLKRP;
-	else
-		mcbsp_cfg.pcr0 &= ~CLKRP;
-
-	if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
-		mcbsp_cfg.pcr0 &= ~CLKXP;
-	else
-		mcbsp_cfg.pcr0 |= CLKXP;
-
-	/* Set SCLKME to 0 and CLKSM to 1 */
-	mcbsp_cfg.pcr0 &= ~SCLKME;
-	mcbsp_cfg.srgr2 |= CLKSM;
-
-	/* Set FSXP */
-	if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
-		mcbsp_cfg.pcr0 &= ~FSXP;
-	else
-		mcbsp_cfg.pcr0 |= FSXP;
-
-	if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
-		mcbsp_cfg.pcr0 |= CLKXM;
-		mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div - 1);
-		mcbsp_cfg.pcr0 |= FSXM;
-		mcbsp_cfg.srgr2 &= ~FSGM;
-		mcbsp_cfg.xcr2 |= XDATDLY(1);
-		mcbsp_cfg.rcr2 |= RDATDLY(1);
-	} else {
-		mcbsp_cfg.pcr0 &= ~CLKXM;
-		mcbsp_cfg.srgr1 |= CLKGDV(1);
-		mcbsp_cfg.pcr0 &= ~FSXM;
-		mcbsp_cfg.xcr2 &= ~XDATDLY(3);
-		mcbsp_cfg.rcr2 &= ~RDATDLY(3);
-	}
-
-	mcbsp_cfg.xcr2 &= ~XPHASE;
-	mcbsp_cfg.rcr2 &= ~RPHASE;
-
-	omap_mcbsp_config(id, &mcbsp_cfg);
-}
-EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
-
 #ifdef CONFIG_ARCH_OMAP3
 #define max_thres(m)			(mcbsp->pdata->buffer_size)
 #define valid_threshold(m, val)		((val) <= max_thres(m))