1 files changed, 353 insertions, 0 deletions
diff --git a/drivers/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c
new file mode 100644
index 000000000..fa4df9943
--- /dev/null
+++ b/drivers/mmc/gen_atmel_mci.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2010
+ * Rob Emanuele <rob@emanuele.us>
+ * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
+ *
+ * Original Driver:
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * 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 <mmc.h>
+#include <part.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/byteorder.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/memory-map.h>
+#include "atmel_mci.h"
+
+#ifndef CONFIG_SYS_MMC_CLK_OD
+# define CONFIG_SYS_MMC_CLK_OD	150000
+#endif
+
+#define MMC_DEFAULT_BLKLEN	512
+
+#if defined(CONFIG_ATMEL_MCI_PORTB)
+# define MCI_BUS 1
+#else
+# define MCI_BUS 0
+#endif
+
+static int initialized = 0;
+
+/*
+ * Print command and status:
+ *
+ * - always when DEBUG is defined
+ * - on command errors
+ */
+static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
+{
+	printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
+		cmdr, cmdr&0x3F, arg, status, msg);
+}
+
+/* Setup for MCI Clock and Block Size */
+static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
+{
+	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
+	u32 bus_hz = get_mci_clk_rate();
+	u32 clkdiv = 255;
+
+	debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
+		bus_hz, hz, blklen);
+	if (hz > 0) {
+		/* find lowest clkdiv yielding a rate <= than requested */
+		for (clkdiv=0; clkdiv<255; clkdiv++) {
+			if ((bus_hz / (clkdiv+1) / 2) <= hz)
+				break;
+		}
+	}
+	printf("mci: setting clock %u Hz, block size %u\n",
+		(bus_hz / (clkdiv+1)) / 2, blklen);
+
+	blklen &= 0xfffc;
+	/* On some platforms RDPROOF and WRPROOF are ignored */
+	writel((MMCI_BF(CLKDIV, clkdiv)
+		 | MMCI_BF(BLKLEN, blklen)
+		 | MMCI_BIT(RDPROOF)
+		 | MMCI_BIT(WRPROOF)), &mci->mr);
+	initialized = 1;
+}
+
+/* Return the CMDR with flags for a given command and data packet */
+static u32 mci_encode_cmd(
+	struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
+{
+	u32 cmdr = 0;
+
+	/* Default Flags for Errors */
+	*error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
+		MMCI_BIT(RINDE) | MMCI_BIT(RTOE));
+
+	/* Default Flags for the Command */
+	cmdr |= MMCI_BIT(MAXLAT);
+
+	if (data) {
+		cmdr |= MMCI_BF(TRCMD, 1);
+		if (data->blocks > 1)
+			cmdr |= MMCI_BF(TRTYP, 1);
+		if (data->flags & MMC_DATA_READ)
+			cmdr |= MMCI_BIT(TRDIR);
+	}
+
+	if (cmd->resp_type & MMC_RSP_CRC)
+		*error_flags |= MMCI_BIT(RCRCE);
+	if (cmd->resp_type & MMC_RSP_136)
+		cmdr |= MMCI_BF(RSPTYP, 2);
+	else if (cmd->resp_type & MMC_RSP_BUSY)
+		cmdr |= MMCI_BF(RSPTYP, 3);
+	else if (cmd->resp_type & MMC_RSP_PRESENT)
+		cmdr |= MMCI_BF(RSPTYP, 1);
+
+	return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
+}
+
+/* Entered into function pointer in mci_send_cmd */
+static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
+{
+	u32 status;
+
+	do {
+		status = readl(&mci->sr);
+		if (status & (error_flags | MMCI_BIT(OVRE)))
+			goto io_fail;
+	} while (!(status & MMCI_BIT(RXRDY)));
+
+	if (status & MMCI_BIT(RXRDY)) {
+		*data = readl(&mci->rdr);
+		status = 0;
+	}
+io_fail:
+	return status;
+}
+
+/* Entered into function pointer in mci_send_cmd */
+static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
+{
+	u32 status;
+
+	do {
+		status = readl(&mci->sr);
+		if (status & (error_flags | MMCI_BIT(UNRE)))
+			goto io_fail;
+	} while (!(status & MMCI_BIT(TXRDY)));
+
+	if (status & MMCI_BIT(TXRDY)) {
+		writel(*data, &mci->tdr);
+		status = 0;
+	}
+io_fail:
+	return status;
+}
+
+/*
+ * Entered into mmc structure during driver init
+ *
+ * Sends a command out on the bus and deals with the block data.
+ * Takes the mmc pointer, a command pointer, and an optional data pointer.
+ */
+static int
+mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
+{
+	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
+	u32 cmdr;
+	u32 error_flags = 0;
+	u32 status;
+
+	if (!initialized) {
+		puts ("MCI not initialized!\n");
+		return COMM_ERR;
+	}
+
+	/* Figure out the transfer arguments */
+	cmdr = mci_encode_cmd(cmd, data, &error_flags);
+
+	/* Send the command */
+	writel(cmd->cmdarg, &mci->argr);
+	writel(cmdr, &mci->cmdr);
+
+#ifdef DEBUG
+	dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
+#endif
+
+	/* Wait for the command to complete */
+	while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));
+
+	if (status & error_flags) {
+		dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
+		return COMM_ERR;
+	}
+
+	/* Copy the response to the response buffer */
+	if (cmd->resp_type & MMC_RSP_136) {
+		cmd->response[0] = readl(&mci->rspr);
+		cmd->response[1] = readl(&mci->rspr1);
+		cmd->response[2] = readl(&mci->rspr2);
+		cmd->response[3] = readl(&mci->rspr3);
+	} else
+		cmd->response[0] = readl(&mci->rspr);
+
+	/* transfer all of the blocks */
+	if (data) {
+		u32 word_count, block_count;
+		u32* ioptr;
+		u32 sys_blocksize, dummy, i;
+		u32 (*mci_data_op)
+			(atmel_mci_t *mci, u32* data, u32 error_flags);
+
+		if (data->flags & MMC_DATA_READ) {
+			mci_data_op = mci_data_read;
+			sys_blocksize = mmc->read_bl_len;
+			ioptr = (u32*)data->dest;
+		} else {
+			mci_data_op = mci_data_write;
+			sys_blocksize = mmc->write_bl_len;
+			ioptr = (u32*)data->src;
+		}
+
+		status = 0;
+		for (block_count = 0;
+				block_count < data->blocks && !status;
+				block_count++) {
+			word_count = 0;
+			do {
+				status = mci_data_op(mci, ioptr, error_flags);
+				word_count++;
+				ioptr++;
+			} while (!status && word_count < (data->blocksize/4));
+#ifdef DEBUG
+			if (data->flags & MMC_DATA_READ)
+			{
+				printf("Read Data:\n");
+				print_buffer(0, data->dest, 1,
+					word_count*4, 0);
+			}
+#endif
+#ifdef DEBUG
+			if (!status && word_count < (sys_blocksize / 4))
+				printf("filling rest of block...\n");
+#endif
+			/* fill the rest of a full block */
+			while (!status && word_count < (sys_blocksize / 4)) {
+				status = mci_data_op(mci, &dummy,
+					error_flags);
+				word_count++;
+			}
+			if (status) {
+				dump_cmd(cmdr, cmd->cmdarg, status,
+					"Data Transfer Failed");
+				return COMM_ERR;
+			}
+		}
+
+		/* Wait for Transfer End */
+		i = 0;
+		do {
+			status = readl(&mci->sr);
+
+			if (status & error_flags) {
+				dump_cmd(cmdr, cmd->cmdarg, status,
+					"DTIP Wait Failed");
+				return COMM_ERR;
+			}
+			i++;
+		} while ((status & MMCI_BIT(DTIP)) && i < 10000);
+		if (status & MMCI_BIT(DTIP)) {
+			dump_cmd(cmdr, cmd->cmdarg, status,
+				"XFER DTIP never unset, ignoring");
+		}
+	}
+
+	return 0;
+}
+
+/* Entered into mmc structure during driver init */
+static void mci_set_ios(struct mmc *mmc)
+{
+	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
+	int busw = (mmc->bus_width == 4) ? 1 : 0;
+
+	/* Set the clock speed */
+	mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
+
+	/*
+	 * set the bus width and select slot for this interface
+	 * there is no capability for multiple slots on the same interface yet
+	 * Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses
+	 */
+	writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+}
+
+/* Entered into mmc structure during driver init */
+static int mci_init(struct mmc *mmc)
+{
+	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
+
+	/* Initialize controller */
+	writel(MMCI_BIT(SWRST), &mci->cr);	/* soft reset */
+	writel(MMCI_BIT(PWSDIS), &mci->cr);	/* disable power save */
+	writel(MMCI_BIT(MCIEN), &mci->cr);	/* enable mci */
+
+	/* Initial Time-outs */
+	writel(0x5f, &mci->dtor);
+	/* Disable Interrupts */
+	writel(~0UL, &mci->idr);
+
+	/* Set default clocks and blocklen */
+	mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
+
+	return 0;
+}
+
+/*
+ * This is the only exported function
+ *
+ * Call it with the MCI register base address
+ */
+int atmel_mci_init(void *regs)
+{
+	struct mmc *mmc = malloc(sizeof(struct mmc));
+
+	if (!mmc)
+		return -1;
+	strcpy(mmc->name, "mci");
+	mmc->priv = regs;
+	mmc->send_cmd = mci_send_cmd;
+	mmc->set_ios = mci_set_ios;
+	mmc->init = mci_init;
+
+	/* need to be able to pass these in on a board by board basis */
+	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+	mmc->host_caps = MMC_MODE_4BIT;
+	/*
+	 * min and max frequencies determined by
+	 * max and min of clock divider
+	 */
+	mmc->f_min = get_mci_clk_rate() / (2*256);
+	mmc->f_max = get_mci_clk_rate() / (2*1);
+
+	mmc_register(mmc);
+
+	return 0;
+}