Coldfire: Consolidate DSPI driver

Unify both MCF5227x and MCF5445x DSPI driver in CPU to
driver/spi folder for common use.

Signed-off-by: TsiChung Liew <tsicliew@gmail.com>

1 files changed, 357 insertions, 0 deletions

diff --git a/drivers/spi/cf_spi.c b/drivers/spi/cf_spi.c
new file mode 100644
index 00000000000..722aafc73c3
--- /dev/null
+++ b/drivers/spi/cf_spi.c
@@ -0,0 +1,357 @@
+/*
+ *
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright (C) 2004-2009 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <spi.h>
+#include <malloc.h>
+#include <asm/immap.h>
+
+struct cf_spi_slave {
+	struct spi_slave slave;
+	uint baudrate;
+	int charbit;
+};
+
+int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
+	       void *din, ulong flags);
+struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode);
+void cfspi_init(void);
+void cfspi_tx(u32 ctrl, u16 data);
+u16 cfspi_rx(void);
+
+extern void cfspi_port_conf(void);
+extern int cfspi_claim_bus(uint bus, uint cs);
+extern void cfspi_release_bus(uint bus, uint cs);
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_CF_DSPI)
+/* DSPI specific mode */
+#define SPI_MODE_MOD	0x00200000
+#define SPI_DBLRATE	0x00100000
+
+void cfspi_init(void)
+{
+	volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
+
+	cfspi_port_conf();	/* port configuration */
+
+	dspi->mcr = DSPI_MCR_MSTR | DSPI_MCR_CSIS7 | DSPI_MCR_CSIS6 |
+	    DSPI_MCR_CSIS5 | DSPI_MCR_CSIS4 | DSPI_MCR_CSIS3 |
+	    DSPI_MCR_CSIS2 | DSPI_MCR_CSIS1 | DSPI_MCR_CSIS0 |
+	    DSPI_MCR_CRXF | DSPI_MCR_CTXF;
+
+	/* Default setting in platform configuration */
+#ifdef CONFIG_SYS_DSPI_CTAR0
+	dspi->ctar[0] = CONFIG_SYS_DSPI_CTAR0;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR1
+	dspi->ctar[1] = CONFIG_SYS_DSPI_CTAR1;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR2
+	dspi->ctar[2] = CONFIG_SYS_DSPI_CTAR2;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR3
+	dspi->ctar[3] = CONFIG_SYS_DSPI_CTAR3;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR4
+	dspi->ctar[4] = CONFIG_SYS_DSPI_CTAR4;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR5
+	dspi->ctar[5] = CONFIG_SYS_DSPI_CTAR5;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR6
+	dspi->ctar[6] = CONFIG_SYS_DSPI_CTAR6;
+#endif
+#ifdef CONFIG_SYS_DSPI_CTAR7
+	dspi->ctar[7] = CONFIG_SYS_DSPI_CTAR7;
+#endif
+}
+
+void cfspi_tx(u32 ctrl, u16 data)
+{
+	volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
+
+	while ((dspi->sr & 0x0000F000) >= 4) ;
+
+	dspi->tfr = (ctrl | data);
+}
+
+u16 cfspi_rx(void)
+{
+	volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
+
+	while ((dspi->sr & 0x000000F0) == 0) ;
+
+	return (dspi->rfr & 0xFFFF);
+}
+
+int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
+	       void *din, ulong flags)
+{
+	struct cf_spi_slave *cfslave = (struct cf_spi_slave *)slave;
+	u16 *spi_rd16 = NULL, *spi_wr16 = NULL;
+	u8 *spi_rd = NULL, *spi_wr = NULL;
+	static u32 ctrl = 0;
+	uint len = bitlen >> 3;
+
+	if (cfslave->charbit == 16) {
+		bitlen >>= 1;
+		spi_wr16 = (u16 *) dout;
+		spi_rd16 = (u16 *) din;
+	} else {
+		spi_wr = (u8 *) dout;
+		spi_rd = (u8 *) din;
+	}
+
+	if ((flags & SPI_XFER_BEGIN) == SPI_XFER_BEGIN)
+		ctrl |= DSPI_TFR_CONT;
+
+	ctrl = (ctrl & 0xFF000000) | ((1 << slave->cs) << 16);
+
+	if (len > 1) {
+		int tmp_len = len - 1;
+		while (tmp_len--) {
+			if (dout != NULL) {
+				if (cfslave->charbit == 16)
+					cfspi_tx(ctrl, *spi_wr16++);
+				else
+					cfspi_tx(ctrl, *spi_wr++);
+				cfspi_rx();
+			}
+
+			if (din != NULL) {
+				cfspi_tx(ctrl, 0);
+				if (cfslave->charbit == 16)
+					*spi_rd16++ = cfspi_rx();
+				else
+					*spi_rd++ = cfspi_rx();
+			}
+		}
+
+		len = 1;	/* remaining byte */
+	}
+
+	if ((flags & SPI_XFER_END) == SPI_XFER_END)
+		ctrl &= ~DSPI_TFR_CONT;
+
+	if (len) {
+		if (dout != NULL) {
+			if (cfslave->charbit == 16)
+				cfspi_tx(ctrl, *spi_wr16);
+			else
+				cfspi_tx(ctrl, *spi_wr);
+			cfspi_rx();
+		}
+
+		if (din != NULL) {
+			cfspi_tx(ctrl, 0);
+			if (cfslave->charbit == 16)
+				*spi_rd16 = cfspi_rx();
+			else
+				*spi_rd = cfspi_rx();
+		}
+	} else {
+		/* dummy read */
+		cfspi_tx(ctrl, 0);
+		cfspi_rx();
+	}
+
+	return 0;
+}
+
+struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode)
+{
+	/*
+	 * bit definition for mode:
+	 * bit 31 - 28: Transfer size 3 to 16 bits
+	 *     27 - 26: PCS to SCK delay prescaler
+	 *     25 - 24: After SCK delay prescaler
+	 *     23 - 22: Delay after transfer prescaler
+	 *     21     : Allow overwrite for bit 31-22 and bit 20-8
+	 *     20     : Double baud rate
+	 *     19 - 16: PCS to SCK delay scaler
+	 *     15 - 12: After SCK delay scaler
+	 *     11 -  8: Delay after transfer scaler
+	 *      7 -  0: SPI_CPHA, SPI_CPOL, SPI_LSB_FIRST
+	 */
+	volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
+	int prescaler[] = { 2, 3, 5, 7 };
+	int scaler[] = {
+		2, 4, 6, 8,
+		16, 32, 64, 128,
+		256, 512, 1024, 2048,
+		4096, 8192, 16384, 32768
+	};
+	int i, j, pbrcnt, brcnt, diff, tmp, dbr = 0;
+	int best_i, best_j, bestmatch = 0x7FFFFFFF, baud_speed;
+	u32 bus_setup = 0;
+
+	tmp = (prescaler[3] * scaler[15]);
+	/* Maximum and minimum baudrate it can handle */
+	if ((cfslave->baudrate > (gd->bus_clk >> 1)) ||
+	    (cfslave->baudrate < (gd->bus_clk / tmp))) {
+		printf("Exceed baudrate limitation: Max %d - Min %d\n",
+		       (int)(gd->bus_clk >> 1), (int)(gd->bus_clk / tmp));
+		return NULL;
+	}
+
+	/* Activate Double Baud when it exceed 1/4 the bus clk */
+	if ((CONFIG_SYS_DSPI_CTAR0 & DSPI_CTAR_DBR) ||
+	    (cfslave->baudrate > (gd->bus_clk / (prescaler[0] * scaler[0])))) {
+		bus_setup |= DSPI_CTAR_DBR;
+		dbr = 1;
+	}
+
+	if (mode & SPI_CPOL)
+		bus_setup |= DSPI_CTAR_CPOL;
+	if (mode & SPI_CPHA)
+		bus_setup |= DSPI_CTAR_CPHA;
+	if (mode & SPI_LSB_FIRST)
+		bus_setup |= DSPI_CTAR_LSBFE;
+
+	/* Overwrite default value set in platform configuration file */
+	if (mode & SPI_MODE_MOD) {
+
+		if ((mode & 0xF0000000) == 0)
+			bus_setup |=
+			    dspi->ctar[cfslave->slave.bus] & 0x78000000;
+		else
+			bus_setup |= ((mode & 0xF0000000) >> 1);
+
+		/*
+		 * Check to see if it is enabled by default in platform
+		 * config, or manual setting passed by mode parameter
+		 */
+		if (mode & SPI_DBLRATE) {
+			bus_setup |= DSPI_CTAR_DBR;
+			dbr = 1;
+		}
+		bus_setup |= (mode & 0x0FC00000) >> 4;	/* PSCSCK, PASC, PDT */
+		bus_setup |= (mode & 0x000FFF00) >> 4;	/* CSSCK, ASC, DT */
+	} else
+		bus_setup |= (dspi->ctar[cfslave->slave.bus] & 0x78FCFFF0);
+
+	cfslave->charbit =
+	    ((dspi->ctar[cfslave->slave.bus] & 0x78000000) ==
+	     0x78000000) ? 16 : 8;
+
+	pbrcnt = sizeof(prescaler) / sizeof(int);
+	brcnt = sizeof(scaler) / sizeof(int);
+
+	/* baudrate calculation - to closer value, may not be exact match */
+	for (best_i = 0, best_j = 0, i = 0; i < pbrcnt; i++) {
+		baud_speed = gd->bus_clk / prescaler[i];
+		for (j = 0; j < brcnt; j++) {
+			tmp = (baud_speed / scaler[j]) * (1 + dbr);
+
+			if (tmp > cfslave->baudrate)
+				diff = tmp - cfslave->baudrate;
+			else
+				diff = cfslave->baudrate - tmp;
+
+			if (diff < bestmatch) {
+				bestmatch = diff;
+				best_i = i;
+				best_j = j;
+			}
+		}
+	}
+	bus_setup |= (DSPI_CTAR_PBR(best_i) | DSPI_CTAR_BR(best_j));
+	dspi->ctar[cfslave->slave.bus] = bus_setup;
+
+	return &cfslave->slave;
+}
+#endif				/* CONFIG_CF_DSPI */
+
+#ifdef CONFIG_CF_QSPI
+/* 52xx, 53xx */
+#endif				/* CONFIG_CF_QSPI */
+
+#ifdef CONFIG_CMD_SPI
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	if (((cs >= 0) && (cs < 8)) && ((bus >= 0) && (bus < 8)))
+		return 1;
+	else
+		return 0;
+}
+
+void spi_init_f(void)
+{
+}
+
+void spi_init_r(void)
+{
+}
+
+void spi_init(void)
+{
+	cfspi_init();
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+				  unsigned int max_hz, unsigned int mode)
+{
+	struct cf_spi_slave *cfslave;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	cfslave = malloc(sizeof(struct cf_spi_slave));
+	if (!cfslave)
+		return NULL;
+
+	cfslave->slave.bus = bus;
+	cfslave->slave.cs = cs;
+	cfslave->baudrate = max_hz;
+
+	/* specific setup */
+	return cfspi_setup_slave(cfslave, mode);
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	free(slave);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	return cfspi_claim_bus(slave->bus, slave->cs);
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	cfspi_release_bus(slave->bus, slave->cs);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+	     void *din, unsigned long flags)
+{
+	return cfspi_xfer(slave, bitlen, dout, din, flags);
+}
+#endif				/* CONFIG_CMD_SPI */