ENGR00112845 spi nor boot and pmic support for BBG2.

spi nor boot support for BBG2.

Signed-off-by: Terry Lv <r65388@freescale.com>

1 files changed, 329 insertions, 0 deletions

diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c
new file mode 100644
index 0000000..6146da9
--- /dev/null
+++ b/drivers/spi/imx_spi.c
@@ -0,0 +1,329 @@
+/*
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <spi.h>
+#include <asm/errno.h>
+#include <linux/types.h>
+#include <asm/io.h>
+#include <malloc.h>
+
+#include <asm/arch/imx_spi.h>
+
+#ifdef	DEBUG
+
+/* -----------------------------------------------
+ * Helper functions to peek into tx and rx buffers
+ * ----------------------------------------------- */
+static const char * const hex_digit = "0123456789ABCDEF";
+
+static char quickhex(int i)
+{
+	return hex_digit[i];
+}
+
+static void memdump(const void *pv, int num)
+{
+
+}
+
+#else /* !DEBUG */
+
+#define	memdump(p, n)
+
+#endif /* DEBUG */
+
+static inline struct imx_spi_dev_t *to_imx_spi_slave(struct spi_slave *slave)
+{
+	return container_of(slave, struct imx_spi_dev_t, slave);
+}
+
+static s32 spi_get_cfg(struct imx_spi_dev_t *dev)
+{
+	switch (dev->slave.cs) {
+	case 0:
+		/* pmic */
+		dev->base = CSPI1_BASE_ADDR;
+		dev->freq = 2500000;
+		dev->ss_pol = IMX_SPI_ACTIVE_HIGH;
+		dev->ss = 0;
+		dev->fifo_sz = 64 * 4;
+		dev->us_delay = 0;
+		break;
+	case 1:
+		/* spi_nor */
+		dev->base = CSPI1_BASE_ADDR;
+		dev->freq = 2500000;
+		dev->ss_pol = IMX_SPI_ACTIVE_LOW;
+		dev->ss = 1;
+		dev->fifo_sz = 64 * 4;
+		dev->us_delay = 0;
+		break;
+	default:
+		printf("Invalid Bus ID! \n");
+		break;
+	}
+
+	return 0;
+}
+
+static s32 spi_reset(struct spi_slave *slave)
+{
+	u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
+	s32 pre_div = 0, post_div = 0, i, reg_ctrl, reg_config;
+	struct imx_spi_dev_t *dev = to_imx_spi_slave(slave);
+	struct spi_reg_t *reg = &(dev->reg);
+
+	if (dev->freq == 0) {
+		printf("Error: desired clock is 0\n");
+		return 1;
+	}
+
+	reg_ctrl = readl(dev->base + SPI_CON_REG);
+	/* Reset spi */
+	writel(0, dev->base + SPI_CON_REG);
+	writel((reg_ctrl | 0x1), dev->base + SPI_CON_REG);
+
+	/* Control register setup */
+	if (clk_src > dev->freq) {
+		pre_div = clk_src / dev->freq;
+		if (pre_div > 16) {
+			post_div = pre_div / 16;
+			pre_div = 15;
+		}
+		if (post_div != 0) {
+			for (i = 0; i < 16; i++) {
+				if ((1 << i) >= post_div)
+					break;
+			}
+			if (i == 16) {
+				printf("Error: no divider can meet the freq: %d\n",
+					dev->freq);
+				return -1;
+			}
+			post_div = i;
+		}
+	}
+
+	debug("pre_div = %d, post_div=%d\n", pre_div, post_div);
+	reg_ctrl = (reg_ctrl & ~(3 << 18)) | dev->ss << 18;
+	reg_ctrl = (reg_ctrl & ~(0xF << 12)) | pre_div << 12;
+	reg_ctrl = (reg_ctrl & ~(0xF << 8)) | post_div << 8;
+	reg_ctrl |= 1 << (dev->ss + 4);	/* always set to master mode !!!! */
+	reg_ctrl &= ~0x1;		/* disable spi */
+
+	reg_config = readl(dev->base + SPI_CFG_REG);
+	/* configuration register setup */
+	reg_config = (reg_config & ~(1 << ((dev->ss + 12)))) |
+		(dev->ss_pol << (dev->ss + 12));
+	reg_config = (reg_config & ~(1 << ((dev->ss + 20)))) |
+		(dev->in_sctl << (dev->ss + 20));
+	reg_config = (reg_config & ~(1 << ((dev->ss + 16)))) |
+		(dev->in_dctl << (dev->ss + 16));
+	reg_config = (reg_config & ~(1 << ((dev->ss + 8)))) |
+		(dev->ssctl << (dev->ss + 8));
+	reg_config = (reg_config & ~(1 << ((dev->ss + 4)))) |
+		(dev->sclkpol << (dev->ss + 4));
+	reg_config = (reg_config & ~(1 << ((dev->ss + 0)))) |
+		(dev->sclkpha << (dev->ss + 0));
+
+	debug("reg_ctrl = 0x%x\n", reg_ctrl);
+	writel(reg_ctrl, dev->base + SPI_CON_REG);
+	debug("reg_config = 0x%x\n", reg_config);
+	writel(reg_config, dev->base + SPI_CFG_REG);
+
+	/* save config register and control register */
+	reg->cfg_reg  = reg_config;
+	reg->ctrl_reg = reg_ctrl;
+
+	/* clear interrupt reg */
+	writel(0, dev->base + SPI_INT_REG);
+	writel(3 << 6, dev->base + SPI_STAT_REG);
+
+	return 0;
+}
+
+void spi_init(void)
+{
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int mode)
+{
+	struct imx_spi_dev_t *imx_spi_slave = NULL;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	imx_spi_slave = (struct imx_spi_dev_t *)malloc(sizeof(struct imx_spi_dev_t));
+	if (!imx_spi_slave)
+		return NULL;
+
+	imx_spi_slave->slave.bus = bus;
+	imx_spi_slave->slave.cs = cs;
+
+	spi_get_cfg(imx_spi_slave);
+
+	spi_io_init(imx_spi_slave);
+
+	spi_reset(&(imx_spi_slave->slave));
+
+	return &(imx_spi_slave->slave);
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct imx_spi_dev_t *imx_spi_slave;
+
+	if (slave) {
+		imx_spi_slave = to_imx_spi_slave(slave);
+		free(imx_spi_slave);
+	}
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+
+}
+
+/*
+ * SPI transfer:
+ *
+ * See include/spi.h and http://www.altera.com/literature/ds/ds_nios_spi.pdf
+ * for more informations.
+ */
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+		void *din, unsigned long flags)
+{
+	s32 val = SPI_RETRY_TIMES;
+	u32 *p_buf;
+	u32 reg;
+	s32 len = 0,
+		ret_val = 0;
+	s32 burst_bytes = bitlen >> 3;
+	s32 tmp = 0;
+	struct imx_spi_dev_t *dev = to_imx_spi_slave(slave);
+	struct spi_reg_t *spi_reg = &(dev->reg);
+
+	if (!slave)
+		return -1;
+
+	if (burst_bytes > (MAX_SPI_BYTES)) {
+		printf("Error: maximum burst size is 0x%x bytes, asking 0x%x\n",
+				MAX_SPI_BYTES, burst_bytes);
+		return -1;
+	}
+
+	if (flags & SPI_XFER_BEGIN) {
+		spi_cs_activate(slave);
+
+		if (spi_reg->ctrl_reg == 0) {
+			printf("Error: spi(base=0x%x) has not been initialized yet\n",
+					dev->base);
+			return -1;
+		}
+		spi_reg->ctrl_reg = (spi_reg->ctrl_reg & ~0xFFF00000) | \
+					((burst_bytes * 8 - 1) << 20);
+
+		writel(spi_reg->ctrl_reg | 0x1, dev->base + SPI_CON_REG);
+		writel(spi_reg->cfg_reg, dev->base + SPI_CFG_REG);
+		debug("ctrl_reg=0x%x, cfg_reg=0x%x\n",
+					 readl(dev->base + SPI_CON_REG),
+					 readl(dev->base + SPI_CFG_REG));
+
+		/* move data to the tx fifo */
+		if (dout) {
+			for (p_buf = (u32 *)dout, len = burst_bytes; len > 0;
+				p_buf++, len -= 4)
+				writel(*p_buf, dev->base + SPI_TX_DATA);
+		} else {
+			for (len = burst_bytes; len > 0; len -= 4)
+				writel(tmp, dev->base + SPI_TX_DATA);
+		}
+
+		reg = readl(dev->base + SPI_CON_REG);
+		reg |= (1 << 2); /* set xch bit */
+		debug("control reg = 0x%08x\n", reg);
+		writel(reg, dev->base + SPI_CON_REG);
+
+		/* poll on the TC bit (transfer complete) */
+		while ((val-- > 0) &&
+			(readl(dev->base + SPI_STAT_REG) & (1 << 7)) == 0) {
+			udelay(100);
+		}
+
+		/* clear the TC bit */
+		writel(3 << 6, dev->base + SPI_STAT_REG);
+		if (val <= 0) {
+			printf("Error: re-tried %d times without response. Give up\n",
+					SPI_RETRY_TIMES);
+			ret_val = -1;
+			goto error;
+		}
+	}
+
+	/* move data in the rx buf */
+	if (flags & SPI_XFER_END) {
+		if (din) {
+			for (p_buf = (u32 *)din, len = burst_bytes; len > 0;
+				++p_buf, len -= 4)
+				*p_buf = readl(dev->base + SPI_RX_DATA);
+		} else {
+			for (len = burst_bytes; len > 0; len -= 4)
+				tmp = readl(dev->base + SPI_RX_DATA);
+		}
+
+		spi_cs_deactivate(slave);
+	}
+
+	return ret_val;
+
+error:
+	spi_cs_deactivate(slave);
+	return ret_val;
+}
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	return 1;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+	struct imx_spi_dev_t *dev = to_imx_spi_slave(slave);
+
+	spi_io_init(dev);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+	struct imx_spi_dev_t *dev = to_imx_spi_slave(slave);
+
+	writel(0, dev->base + SPI_CON_REG);
+}
+