1 files changed, 428 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/drivers/mmc/mxsmmc.c b/qemu/roms/u-boot/drivers/mmc/mxsmmc.c
new file mode 100644
index 000000000..2fa4eeef4
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/mmc/mxsmmc.c
@@ -0,0 +1,428 @@
+/*
+ * Freescale i.MX28 SSP MMC driver
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * Based on code from LTIB:
+ * (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * Terry Lv
+ *
+ * Copyright 2007, Freescale Semiconductor, Inc
+ * Andy Fleming
+ *
+ * Based vaguely on the pxa mmc code:
+ * (C) Copyright 2003
+ * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <malloc.h>
+#include <mmc.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/imx-common/dma.h>
+#include <bouncebuf.h>
+
+struct mxsmmc_priv {
+	int			id;
+	struct mxs_ssp_regs	*regs;
+	uint32_t		buswidth;
+	int			(*mmc_is_wp)(int);
+	int			(*mmc_cd)(int);
+	struct mxs_dma_desc	*desc;
+	struct mmc_config	cfg;	/* mmc configuration */
+};
+
+#define	MXSMMC_MAX_TIMEOUT	10000
+#define MXSMMC_SMALL_TRANSFER	512
+
+static int mxsmmc_cd(struct mxsmmc_priv *priv)
+{
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+
+	if (priv->mmc_cd)
+		return priv->mmc_cd(priv->id);
+
+	return !(readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_CARD_DETECT);
+}
+
+static int mxsmmc_send_cmd_pio(struct mxsmmc_priv *priv, struct mmc_data *data)
+{
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+	uint32_t *data_ptr;
+	int timeout = MXSMMC_MAX_TIMEOUT;
+	uint32_t reg;
+	uint32_t data_count = data->blocksize * data->blocks;
+
+	if (data->flags & MMC_DATA_READ) {
+		data_ptr = (uint32_t *)data->dest;
+		while (data_count && --timeout) {
+			reg = readl(&ssp_regs->hw_ssp_status);
+			if (!(reg & SSP_STATUS_FIFO_EMPTY)) {
+				*data_ptr++ = readl(&ssp_regs->hw_ssp_data);
+				data_count -= 4;
+				timeout = MXSMMC_MAX_TIMEOUT;
+			} else
+				udelay(1000);
+		}
+	} else {
+		data_ptr = (uint32_t *)data->src;
+		timeout *= 100;
+		while (data_count && --timeout) {
+			reg = readl(&ssp_regs->hw_ssp_status);
+			if (!(reg & SSP_STATUS_FIFO_FULL)) {
+				writel(*data_ptr++, &ssp_regs->hw_ssp_data);
+				data_count -= 4;
+				timeout = MXSMMC_MAX_TIMEOUT;
+			} else
+				udelay(1000);
+		}
+	}
+
+	return timeout ? 0 : COMM_ERR;
+}
+
+static int mxsmmc_send_cmd_dma(struct mxsmmc_priv *priv, struct mmc_data *data)
+{
+	uint32_t data_count = data->blocksize * data->blocks;
+	int dmach;
+	struct mxs_dma_desc *desc = priv->desc;
+	void *addr;
+	unsigned int flags;
+	struct bounce_buffer bbstate;
+
+	memset(desc, 0, sizeof(struct mxs_dma_desc));
+	desc->address = (dma_addr_t)desc;
+
+	if (data->flags & MMC_DATA_READ) {
+		priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_WRITE;
+		addr = data->dest;
+		flags = GEN_BB_WRITE;
+	} else {
+		priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_READ;
+		addr = (void *)data->src;
+		flags = GEN_BB_READ;
+	}
+
+	bounce_buffer_start(&bbstate, addr, data_count, flags);
+
+	priv->desc->cmd.address = (dma_addr_t)bbstate.bounce_buffer;
+
+	priv->desc->cmd.data |= MXS_DMA_DESC_IRQ | MXS_DMA_DESC_DEC_SEM |
+				(data_count << MXS_DMA_DESC_BYTES_OFFSET);
+
+	dmach = MXS_DMA_CHANNEL_AHB_APBH_SSP0 + priv->id;
+	mxs_dma_desc_append(dmach, priv->desc);
+	if (mxs_dma_go(dmach)) {
+		bounce_buffer_stop(&bbstate);
+		return COMM_ERR;
+	}
+
+	bounce_buffer_stop(&bbstate);
+
+	return 0;
+}
+
+/*
+ * Sends a command out on the bus.  Takes the mmc pointer,
+ * a command pointer, and an optional data pointer.
+ */
+static int
+mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
+{
+	struct mxsmmc_priv *priv = mmc->priv;
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+	uint32_t reg;
+	int timeout;
+	uint32_t ctrl0;
+	int ret;
+
+	debug("MMC%d: CMD%d\n", mmc->block_dev.dev, cmd->cmdidx);
+
+	/* Check bus busy */
+	timeout = MXSMMC_MAX_TIMEOUT;
+	while (--timeout) {
+		udelay(1000);
+		reg = readl(&ssp_regs->hw_ssp_status);
+		if (!(reg &
+			(SSP_STATUS_BUSY | SSP_STATUS_DATA_BUSY |
+			SSP_STATUS_CMD_BUSY))) {
+			break;
+		}
+	}
+
+	if (!timeout) {
+		printf("MMC%d: Bus busy timeout!\n", mmc->block_dev.dev);
+		return TIMEOUT;
+	}
+
+	/* See if card is present */
+	if (!mxsmmc_cd(priv)) {
+		printf("MMC%d: No card detected!\n", mmc->block_dev.dev);
+		return NO_CARD_ERR;
+	}
+
+	/* Start building CTRL0 contents */
+	ctrl0 = priv->buswidth;
+
+	/* Set up command */
+	if (!(cmd->resp_type & MMC_RSP_CRC))
+		ctrl0 |= SSP_CTRL0_IGNORE_CRC;
+	if (cmd->resp_type & MMC_RSP_PRESENT)	/* Need to get response */
+		ctrl0 |= SSP_CTRL0_GET_RESP;
+	if (cmd->resp_type & MMC_RSP_136)	/* It's a 136 bits response */
+		ctrl0 |= SSP_CTRL0_LONG_RESP;
+
+	if (data && (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER))
+		writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_clr);
+	else
+		writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_set);
+
+	/* Command index */
+	reg = readl(&ssp_regs->hw_ssp_cmd0);
+	reg &= ~(SSP_CMD0_CMD_MASK | SSP_CMD0_APPEND_8CYC);
+	reg |= cmd->cmdidx << SSP_CMD0_CMD_OFFSET;
+	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
+		reg |= SSP_CMD0_APPEND_8CYC;
+	writel(reg, &ssp_regs->hw_ssp_cmd0);
+
+	/* Command argument */
+	writel(cmd->cmdarg, &ssp_regs->hw_ssp_cmd1);
+
+	/* Set up data */
+	if (data) {
+		/* READ or WRITE */
+		if (data->flags & MMC_DATA_READ) {
+			ctrl0 |= SSP_CTRL0_READ;
+		} else if (priv->mmc_is_wp &&
+			priv->mmc_is_wp(mmc->block_dev.dev)) {
+			printf("MMC%d: Can not write a locked card!\n",
+				mmc->block_dev.dev);
+			return UNUSABLE_ERR;
+		}
+
+		ctrl0 |= SSP_CTRL0_DATA_XFER;
+
+		reg = data->blocksize * data->blocks;
+#if defined(CONFIG_MX23)
+		ctrl0 |= reg & SSP_CTRL0_XFER_COUNT_MASK;
+
+		clrsetbits_le32(&ssp_regs->hw_ssp_cmd0,
+			SSP_CMD0_BLOCK_SIZE_MASK | SSP_CMD0_BLOCK_COUNT_MASK,
+			((data->blocks - 1) << SSP_CMD0_BLOCK_COUNT_OFFSET) |
+			((ffs(data->blocksize) - 1) <<
+				SSP_CMD0_BLOCK_SIZE_OFFSET));
+#elif defined(CONFIG_MX28)
+		writel(reg, &ssp_regs->hw_ssp_xfer_size);
+
+		reg = ((data->blocks - 1) <<
+			SSP_BLOCK_SIZE_BLOCK_COUNT_OFFSET) |
+			((ffs(data->blocksize) - 1) <<
+			SSP_BLOCK_SIZE_BLOCK_SIZE_OFFSET);
+		writel(reg, &ssp_regs->hw_ssp_block_size);
+#endif
+	}
+
+	/* Kick off the command */
+	ctrl0 |= SSP_CTRL0_WAIT_FOR_IRQ | SSP_CTRL0_ENABLE | SSP_CTRL0_RUN;
+	writel(ctrl0, &ssp_regs->hw_ssp_ctrl0);
+
+	/* Wait for the command to complete */
+	timeout = MXSMMC_MAX_TIMEOUT;
+	while (--timeout) {
+		udelay(1000);
+		reg = readl(&ssp_regs->hw_ssp_status);
+		if (!(reg & SSP_STATUS_CMD_BUSY))
+			break;
+	}
+
+	if (!timeout) {
+		printf("MMC%d: Command %d busy\n",
+			mmc->block_dev.dev, cmd->cmdidx);
+		return TIMEOUT;
+	}
+
+	/* Check command timeout */
+	if (reg & SSP_STATUS_RESP_TIMEOUT) {
+		printf("MMC%d: Command %d timeout (status 0x%08x)\n",
+			mmc->block_dev.dev, cmd->cmdidx, reg);
+		return TIMEOUT;
+	}
+
+	/* Check command errors */
+	if (reg & (SSP_STATUS_RESP_CRC_ERR | SSP_STATUS_RESP_ERR)) {
+		printf("MMC%d: Command %d error (status 0x%08x)!\n",
+			mmc->block_dev.dev, cmd->cmdidx, reg);
+		return COMM_ERR;
+	}
+
+	/* Copy response to response buffer */
+	if (cmd->resp_type & MMC_RSP_136) {
+		cmd->response[3] = readl(&ssp_regs->hw_ssp_sdresp0);
+		cmd->response[2] = readl(&ssp_regs->hw_ssp_sdresp1);
+		cmd->response[1] = readl(&ssp_regs->hw_ssp_sdresp2);
+		cmd->response[0] = readl(&ssp_regs->hw_ssp_sdresp3);
+	} else
+		cmd->response[0] = readl(&ssp_regs->hw_ssp_sdresp0);
+
+	/* Return if no data to process */
+	if (!data)
+		return 0;
+
+	if (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER) {
+		ret = mxsmmc_send_cmd_pio(priv, data);
+		if (ret) {
+			printf("MMC%d: Data timeout with command %d "
+				"(status 0x%08x)!\n",
+				mmc->block_dev.dev, cmd->cmdidx, reg);
+			return ret;
+		}
+	} else {
+		ret = mxsmmc_send_cmd_dma(priv, data);
+		if (ret) {
+			printf("MMC%d: DMA transfer failed\n",
+				mmc->block_dev.dev);
+			return ret;
+		}
+	}
+
+	/* Check data errors */
+	reg = readl(&ssp_regs->hw_ssp_status);
+	if (reg &
+		(SSP_STATUS_TIMEOUT | SSP_STATUS_DATA_CRC_ERR |
+		SSP_STATUS_FIFO_OVRFLW | SSP_STATUS_FIFO_UNDRFLW)) {
+		printf("MMC%d: Data error with command %d (status 0x%08x)!\n",
+			mmc->block_dev.dev, cmd->cmdidx, reg);
+		return COMM_ERR;
+	}
+
+	return 0;
+}
+
+static void mxsmmc_set_ios(struct mmc *mmc)
+{
+	struct mxsmmc_priv *priv = mmc->priv;
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+
+	/* Set the clock speed */
+	if (mmc->clock)
+		mxs_set_ssp_busclock(priv->id, mmc->clock / 1000);
+
+	switch (mmc->bus_width) {
+	case 1:
+		priv->buswidth = SSP_CTRL0_BUS_WIDTH_ONE_BIT;
+		break;
+	case 4:
+		priv->buswidth = SSP_CTRL0_BUS_WIDTH_FOUR_BIT;
+		break;
+	case 8:
+		priv->buswidth = SSP_CTRL0_BUS_WIDTH_EIGHT_BIT;
+		break;
+	}
+
+	/* Set the bus width */
+	clrsetbits_le32(&ssp_regs->hw_ssp_ctrl0,
+			SSP_CTRL0_BUS_WIDTH_MASK, priv->buswidth);
+
+	debug("MMC%d: Set %d bits bus width\n",
+		mmc->block_dev.dev, mmc->bus_width);
+}
+
+static int mxsmmc_init(struct mmc *mmc)
+{
+	struct mxsmmc_priv *priv = mmc->priv;
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+
+	/* Reset SSP */
+	mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg);
+
+	/* Reconfigure the SSP block for MMC operation */
+	writel(SSP_CTRL1_SSP_MODE_SD_MMC |
+		SSP_CTRL1_WORD_LENGTH_EIGHT_BITS |
+		SSP_CTRL1_DMA_ENABLE |
+		SSP_CTRL1_POLARITY |
+		SSP_CTRL1_RECV_TIMEOUT_IRQ_EN |
+		SSP_CTRL1_DATA_CRC_IRQ_EN |
+		SSP_CTRL1_DATA_TIMEOUT_IRQ_EN |
+		SSP_CTRL1_RESP_TIMEOUT_IRQ_EN |
+		SSP_CTRL1_RESP_ERR_IRQ_EN,
+		&ssp_regs->hw_ssp_ctrl1_set);
+
+	/* Set initial bit clock 400 KHz */
+	mxs_set_ssp_busclock(priv->id, 400);
+
+	/* Send initial 74 clock cycles (185 us @ 400 KHz)*/
+	writel(SSP_CMD0_CONT_CLKING_EN, &ssp_regs->hw_ssp_cmd0_set);
+	udelay(200);
+	writel(SSP_CMD0_CONT_CLKING_EN, &ssp_regs->hw_ssp_cmd0_clr);
+
+	return 0;
+}
+
+static const struct mmc_ops mxsmmc_ops = {
+	.send_cmd	= mxsmmc_send_cmd,
+	.set_ios	= mxsmmc_set_ios,
+	.init		= mxsmmc_init,
+};
+
+int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int), int (*cd)(int))
+{
+	struct mmc *mmc = NULL;
+	struct mxsmmc_priv *priv = NULL;
+	int ret;
+	const unsigned int mxsmmc_clk_id = mxs_ssp_clock_by_bus(id);
+
+	if (!mxs_ssp_bus_id_valid(id))
+		return -ENODEV;
+
+	priv = malloc(sizeof(struct mxsmmc_priv));
+	if (!priv)
+		return -ENOMEM;
+
+	priv->desc = mxs_dma_desc_alloc();
+	if (!priv->desc) {
+		free(priv);
+		return -ENOMEM;
+	}
+
+	ret = mxs_dma_init_channel(MXS_DMA_CHANNEL_AHB_APBH_SSP0 + id);
+	if (ret)
+		return ret;
+
+	priv->mmc_is_wp = wp;
+	priv->mmc_cd = cd;
+	priv->id = id;
+	priv->regs = mxs_ssp_regs_by_bus(id);
+
+	priv->cfg.name = "MXS MMC";
+	priv->cfg.ops = &mxsmmc_ops;
+
+	priv->cfg.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+	priv->cfg.host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT |
+			 MMC_MODE_HS_52MHz | MMC_MODE_HS |
+			 MMC_MODE_HC;
+
+	/*
+	 * SSPCLK = 480 * 18 / 29 / 1 = 297.731 MHz
+	 * SSP bit rate = SSPCLK / (CLOCK_DIVIDE * (1 + CLOCK_RATE)),
+	 * CLOCK_DIVIDE has to be an even value from 2 to 254, and
+	 * CLOCK_RATE could be any integer from 0 to 255.
+	 */
+	priv->cfg.f_min = 400000;
+	priv->cfg.f_max = mxc_get_clock(MXC_SSP0_CLK + mxsmmc_clk_id) * 1000 / 2;
+	priv->cfg.b_max = 0x20;
+
+	mmc = mmc_create(&priv->cfg, priv);
+	if (mmc == NULL) {
+		mxs_dma_desc_free(priv->desc);
+		free(priv);
+		return -ENOMEM;
+	}
+	return 0;
+}