path: root/target/linux/octeon/patches-3.18/150-mmc-octeon-add-host-driver-for-octeon-mmc-controller.patch

diff --git a/Documentation/devicetree/bindings/mmc/octeon-mmc.txt b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
new file mode 100644
index 0000000..40dd7f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
@@ -0,0 +1,69 @@
+* OCTEON SD/MMC Host Controller
+
+This controller is present on some members of the Cavium OCTEON SoC
+family, provide an interface for eMMC, MMC and SD devices.  There is a
+single controller that may have several "slots" connected.  These
+slots appear as children of the main controller node.
+The DMA engine is an integral part of the controller block.
+
+Required properties:
+- compatible : Should be "cavium,octeon-6130-mmc" or "cavium,octeon-7890-mmc"
+- reg : Two entries:
+	1) The base address of the MMC controller register bank.
+	2) The base address of the MMC DMA engine register bank.
+- interrupts :
+	For "cavium,octeon-6130-mmc": two entries:
+	1) The MMC controller interrupt line.
+	2) The MMC DMA engine interrupt line.
+	For "cavium,octeon-7890-mmc": nine entries:
+	1) The next block transfer of a multiblock transfer has completed (BUF_DONE)
+	2) Operation completed successfully (CMD_DONE).
+	3) DMA transfer completed successfully (DMA_DONE).
+	4) Operation encountered an error (CMD_ERR).
+	5) DMA transfer encountered an error (DMA_ERR).
+	6) Switch operation completed successfully (SWITCH_DONE).
+	7) Switch operation encountered an error (SWITCH_ERR).
+	8) Internal DMA engine request completion interrupt (DONE).
+	9) Internal DMA FIFO underflow (FIFO).
+- #address-cells : Must be <1>
+- #size-cells : Must be <0>
+
+Required properties of child nodes:
+- compatible : Should be "cavium,octeon-6130-mmc-slot".
+- reg : The slot number.
+
+Optional properties of child nodes:
+- cd-gpios : Specify GPIOs for card detection
+- wp-gpios : Specify GPIOs for write protection
+- power-gpios : Specify GPIOs for power control
+- cavium,bus-max-width : The number of data lines present in the slot.
+	Default is 8.
+- spi-max-frequency : The maximum operating frequency of the slot.
+	Default is 52000000.
+- cavium,cmd-clk-skew : the amount of delay (in pS) past the clock edge
+	to sample the command pin.
+- cavium,dat-clk-skew : the amount of delay (in pS) past the clock edge
+	to sample the data pin.
+
+Example:
+	mmc@1180000002000 {
+		compatible = "cavium,octeon-6130-mmc";
+		reg = <0x11800 0x00002000 0x0 0x100>,
+		      <0x11800 0x00000168 0x0 0x20>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		/* EMM irq, DMA irq */
+		interrupts = <1 19>, <0 63>;
+
+		/* The board only has a single MMC slot */
+		mmc-slot@0 {
+			compatible = "cavium,octeon-6130-mmc-slot";
+			reg = <0>;
+			spi-max-frequency = <20000000>;
+			/* bus width can be 1, 4 or 8 */
+			cavium,bus-max-width = <8>;
+			cd-gpios = <&gpio 9 0>;
+			wp-gpios = <&gpio 10 0>;
+			power-gpios = <&gpio 8 0>;
+		};
+	};
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 2d6fbdd..5077dfa 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -338,6 +338,16 @@
 
 	  If unsure, say N.
 
+config MMC_OCTEON
+	tristate "Cavium OCTEON Multimedia Card Interface support"
+	depends on CAVIUM_OCTEON_SOC
+	help
+	  This selects Cavium OCTEON Multimedia card Interface.
+	  If you have an OCTEON board with a Multimedia Card slot,
+	  say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_TIFM_SD
 	tristate "TI Flash Media MMC/SD Interface support"
 	depends on PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index f7b0a77..448bbc9 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_MMC_SDHCI_SIRF)   	+= sdhci-sirf.o
 obj-$(CONFIG_MMC_SDHCI_SPEAR)	+= sdhci-spear.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
+obj-$(CONFIG_MMC_OCTEON)	+= octeon_mmc.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o
 obj-$(CONFIG_MMC_OMAP_HS)	+= omap_hsmmc.o
 obj-$(CONFIG_MMC_ATMELMCI)	+= atmel-mci.o
diff --git a/drivers/mmc/host/octeon_mmc.c b/drivers/mmc/host/octeon_mmc.c
new file mode 100644
index 0000000..baba5a0
--- /dev/null
+++ b/drivers/mmc/host/octeon_mmc.c
@@ -0,0 +1,1518 @@
+/*
+ * Driver for MMC and SSD cards for Cavium OCTEON SOCs.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012-2014 Cavium Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/of_gpio.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+#include <net/irda/parameters.h>
+
+#include <asm/byteorder.h>
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-mio-defs.h>
+
+#define DRV_NAME	"octeon_mmc"
+
+#define OCTEON_MAX_MMC			4
+
+#define OCT_MIO_NDF_DMA_CFG		0x00
+#define OCT_MIO_EMM_DMA_ADR		0x08
+
+#define OCT_MIO_EMM_CFG			0x00
+#define OCT_MIO_EMM_SWITCH		0x48
+#define OCT_MIO_EMM_DMA			0x50
+#define OCT_MIO_EMM_CMD			0x58
+#define OCT_MIO_EMM_RSP_STS		0x60
+#define OCT_MIO_EMM_RSP_LO		0x68
+#define OCT_MIO_EMM_RSP_HI		0x70
+#define OCT_MIO_EMM_INT			0x78
+#define OCT_MIO_EMM_INT_EN		0x80
+#define OCT_MIO_EMM_WDOG		0x88
+#define OCT_MIO_EMM_SAMPLE		0x90
+#define OCT_MIO_EMM_STS_MASK		0x98
+#define OCT_MIO_EMM_RCA			0xa0
+#define OCT_MIO_EMM_BUF_IDX		0xe0
+#define OCT_MIO_EMM_BUF_DAT		0xe8
+
+#define CVMX_MIO_BOOT_CTL CVMX_ADD_IO_SEG(0x00011800000000D0ull)
+
+struct octeon_mmc_host {
+	u64	base;
+	u64	ndf_base;
+	u64	emm_cfg;
+	u64	n_minus_one;  /* OCTEON II workaround location */
+	int	last_slot;
+
+	struct semaphore mmc_serializer;
+	struct mmc_request	*current_req;
+	unsigned int		linear_buf_size;
+	void			*linear_buf;
+	struct sg_mapping_iter smi;
+	int sg_idx;
+	bool dma_active;
+
+	struct platform_device	*pdev;
+	int global_pwr_gpio;
+	bool global_pwr_gpio_low;
+	bool dma_err_pending;
+	bool need_bootbus_lock;
+	bool big_dma_addr;
+	bool need_irq_handler_lock;
+	spinlock_t irq_handler_lock;
+
+	struct octeon_mmc_slot	*slot[OCTEON_MAX_MMC];
+};
+
+struct octeon_mmc_slot {
+	struct mmc_host         *mmc;	/* slot-level mmc_core object */
+	struct octeon_mmc_host	*host;	/* common hw for all 4 slots */
+
+	unsigned int		clock;
+	unsigned int		sclock;
+
+	u64			cached_switch;
+	u64			cached_rca;
+
+	unsigned int		cmd_cnt; /* sample delay */
+	unsigned int		dat_cnt; /* sample delay */
+
+	int			bus_width;
+	int			bus_id;
+	int			ro_gpio;
+	int			cd_gpio;
+	int			pwr_gpio;
+	bool			cd_gpio_low;
+	bool			ro_gpio_low;
+	bool			pwr_gpio_low;
+};
+
+static int bb_size = 1 << 16;
+module_param(bb_size, int, S_IRUGO);
+MODULE_PARM_DESC(bb_size,
+		 "Size of DMA linearizing buffer (max transfer size).");
+
+static int ddr = 2;
+module_param(ddr, int, S_IRUGO);
+MODULE_PARM_DESC(ddr,
+		 "enable DoubleDataRate clocking: 0=no, 1=always, 2=at spi-max-frequency/2");
+
+#if 0
+#define octeon_mmc_dbg trace_printk
+#else
+static inline void octeon_mmc_dbg(const char *s, ...) { }
+#endif
+
+static void octeon_mmc_acquire_bus(struct octeon_mmc_host *host)
+{
+	if (host->need_bootbus_lock) {
+		down(&octeon_bootbus_sem);
+		/* On cn70XX switch the mmc unit onto the bus. */
+		if (OCTEON_IS_MODEL(OCTEON_CN70XX))
+			cvmx_write_csr(CVMX_MIO_BOOT_CTL, 0);
+	} else {
+		down(&host->mmc_serializer);
+	}
+}
+
+static void octeon_mmc_release_bus(struct octeon_mmc_host *host)
+{
+	if (host->need_bootbus_lock)
+		up(&octeon_bootbus_sem);
+	else
+		up(&host->mmc_serializer);
+}
+
+struct octeon_mmc_cr_type {
+	u8 ctype;
+	u8 rtype;
+};
+
+/*
+ * The OCTEON MMC host hardware assumes that all commands have fixed
+ * command and response types.  These are correct if MMC devices are
+ * being used.  However, non-MMC devices like SD use command and
+ * response types that are unexpected by the host hardware.
+ *
+ * The command and response types can be overridden by supplying an
+ * XOR value that is applied to the type.  We calculate the XOR value
+ * from the values in this table and the flags passed from the MMC
+ * core.
+ */
+static struct octeon_mmc_cr_type octeon_mmc_cr_types[] = {
+	{0, 0},		/* CMD0 */
+	{0, 3},		/* CMD1 */
+	{0, 2},		/* CMD2 */
+	{0, 1},		/* CMD3 */
+	{0, 0},		/* CMD4 */
+	{0, 1},		/* CMD5 */
+	{0, 1},		/* CMD6 */
+	{0, 1},		/* CMD7 */
+	{1, 1},		/* CMD8 */
+	{0, 2},		/* CMD9 */
+	{0, 2},		/* CMD10 */
+	{1, 1},		/* CMD11 */
+	{0, 1},		/* CMD12 */
+	{0, 1},		/* CMD13 */
+	{1, 1},		/* CMD14 */
+	{0, 0},		/* CMD15 */
+	{0, 1},		/* CMD16 */
+	{1, 1},		/* CMD17 */
+	{1, 1},		/* CMD18 */
+	{3, 1},		/* CMD19 */
+	{2, 1},		/* CMD20 */
+	{0, 0},		/* CMD21 */
+	{0, 0},		/* CMD22 */
+	{0, 1},		/* CMD23 */
+	{2, 1},		/* CMD24 */
+	{2, 1},		/* CMD25 */
+	{2, 1},		/* CMD26 */
+	{2, 1},		/* CMD27 */
+	{0, 1},		/* CMD28 */
+	{0, 1},		/* CMD29 */
+	{1, 1},		/* CMD30 */
+	{1, 1},		/* CMD31 */
+	{0, 0},		/* CMD32 */
+	{0, 0},		/* CMD33 */
+	{0, 0},		/* CMD34 */
+	{0, 1},		/* CMD35 */
+	{0, 1},		/* CMD36 */
+	{0, 0},		/* CMD37 */
+	{0, 1},		/* CMD38 */
+	{0, 4},		/* CMD39 */
+	{0, 5},		/* CMD40 */
+	{0, 0},		/* CMD41 */
+	{2, 1},		/* CMD42 */
+	{0, 0},		/* CMD43 */
+	{0, 0},		/* CMD44 */
+	{0, 0},		/* CMD45 */
+	{0, 0},		/* CMD46 */
+	{0, 0},		/* CMD47 */
+	{0, 0},		/* CMD48 */
+	{0, 0},		/* CMD49 */
+	{0, 0},		/* CMD50 */
+	{0, 0},		/* CMD51 */
+	{0, 0},		/* CMD52 */
+	{0, 0},		/* CMD53 */
+	{0, 0},		/* CMD54 */
+	{0, 1},		/* CMD55 */
+	{0xff, 0xff},	/* CMD56 */
+	{0, 0},		/* CMD57 */
+	{0, 0},		/* CMD58 */
+	{0, 0},		/* CMD59 */
+	{0, 0},		/* CMD60 */
+	{0, 0},		/* CMD61 */
+	{0, 0},		/* CMD62 */
+	{0, 0}		/* CMD63 */
+};
+
+struct octeon_mmc_cr_mods {
+	u8 ctype_xor;
+	u8 rtype_xor;
+};
+
+/*
+ * The functions below are used for the EMMC-17978 workaround.
+ *
+ * Due to an imperfection in the design of the MMC bus hardware,
+ * the 2nd to last cache block of a DMA read must be locked into the L2 Cache.
+ * Otherwise, data corruption may occur.
+ */
+
+static inline void *phys_to_ptr(u64 address)
+{
+	return (void *)(address | (1ull<<63)); /* XKPHYS */
+}
+
+/**
+ * Lock a single line into L2. The line is zeroed before locking
+ * to make sure no dram accesses are made.
+ *
+ * @addr   Physical address to lock
+ */
+static void l2c_lock_line(u64 addr)
+{
+	char *addr_ptr = phys_to_ptr(addr);
+
+	asm volatile (
+		"cache 31, %[line]"	/* Unlock the line */
+		:: [line] "m" (*addr_ptr));
+}
+
+/**
+ * Locks a memory region in the L2 cache
+ *
+ * @start - start address to begin locking
+ * @len - length in bytes to lock
+ */
+static void l2c_lock_mem_region(u64 start, u64 len)
+{
+	u64 end;
+
+	/* Round start/end to cache line boundaries */
+	end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
+	start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
+
+	while (start <= end) {
+		l2c_lock_line(start);
+		start += CVMX_CACHE_LINE_SIZE;
+	}
+	asm volatile("sync");
+}
+
+/**
+ * Unlock a single line in the L2 cache.
+ *
+ * @addr	Physical address to unlock
+ *
+ * Return Zero on success
+ */
+static void l2c_unlock_line(u64 addr)
+{
+	char *addr_ptr = phys_to_ptr(addr);
+	asm volatile (
+		"cache 23, %[line]"	/* Unlock the line */
+		:: [line] "m" (*addr_ptr));
+}
+
+/**
+ * Unlock a memory region in the L2 cache
+ *
+ * @start - start address to unlock
+ * @len - length to unlock in bytes
+ */
+static void l2c_unlock_mem_region(u64 start, u64 len)
+{
+	u64 end;
+
+	/* Round start/end to cache line boundaries */
+	end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
+	start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
+
+	while (start <= end) {
+		l2c_unlock_line(start);
+		start += CVMX_CACHE_LINE_SIZE;
+	}
+}
+
+static struct octeon_mmc_cr_mods octeon_mmc_get_cr_mods(struct mmc_command *cmd)
+{
+	struct octeon_mmc_cr_type *cr;
+	u8 desired_ctype, hardware_ctype;
+	u8 desired_rtype, hardware_rtype;
+	struct octeon_mmc_cr_mods r;
+
+	desired_ctype = desired_rtype = 0;
+
+	cr = octeon_mmc_cr_types + (cmd->opcode & 0x3f);
+	hardware_ctype = cr->ctype;
+	hardware_rtype = cr->rtype;
+	if (cmd->opcode == 56) { /* CMD56 GEN_CMD */
+		hardware_ctype = (cmd->arg & 1) ? 1 : 2;
+	}
+
+	switch (mmc_cmd_type(cmd)) {
+	case MMC_CMD_ADTC:
+		desired_ctype = (cmd->data->flags & MMC_DATA_WRITE) ? 2 : 1;
+		break;
+	case MMC_CMD_AC:
+	case MMC_CMD_BC:
+	case MMC_CMD_BCR:
+		desired_ctype = 0;
+		break;
+	}
+
+	switch (mmc_resp_type(cmd)) {
+	case MMC_RSP_NONE:
+		desired_rtype = 0;
+		break;
+	case MMC_RSP_R1:/* MMC_RSP_R5, MMC_RSP_R6, MMC_RSP_R7 */
+	case MMC_RSP_R1B:
+		desired_rtype = 1;
+		break;
+	case MMC_RSP_R2:
+		desired_rtype = 2;
+		break;
+	case MMC_RSP_R3: /* MMC_RSP_R4 */
+		desired_rtype = 3;
+		break;
+	}
+	r.ctype_xor = desired_ctype ^ hardware_ctype;
+	r.rtype_xor = desired_rtype ^ hardware_rtype;
+	return r;
+}
+
+static bool octeon_mmc_switch_val_changed(struct octeon_mmc_slot *slot,
+					  u64 new_val)
+{
+	/* Match BUS_ID, HS_TIMING, BUS_WIDTH, POWER_CLASS, CLK_HI, CLK_LO */
+	u64 m = 0x3001070fffffffffull;
+
+	return (slot->cached_switch & m) != (new_val & m);
+}
+
+static unsigned int octeon_mmc_timeout_to_wdog(struct octeon_mmc_slot *slot,
+					       unsigned int ns)
+{
+	u64 bt = (u64)slot->clock * (u64)ns;
+
+	return (unsigned int)(bt / 1000000000);
+}
+
+static irqreturn_t octeon_mmc_interrupt(int irq, void *dev_id)
+{
+	struct octeon_mmc_host *host = dev_id;
+	union cvmx_mio_emm_int emm_int;
+	struct mmc_request	*req;
+	bool host_done;
+	union cvmx_mio_emm_rsp_sts rsp_sts;
+	unsigned long flags = 0;
+
+	if (host->need_irq_handler_lock)
+		spin_lock_irqsave(&host->irq_handler_lock, flags);
+	emm_int.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
+	req = host->current_req;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+
+	octeon_mmc_dbg("Got interrupt: EMM_INT = 0x%llx\n", emm_int.u64);
+
+	if (!req)
+		goto out;
+
+	rsp_sts.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
+	octeon_mmc_dbg("octeon_mmc_interrupt  MIO_EMM_RSP_STS 0x%llx\n",
+		rsp_sts.u64);
+
+	if (host->dma_err_pending) {
+		host->current_req = NULL;
+		host->dma_err_pending = false;
+		req->done(req);
+		host_done = true;
+		goto no_req_done;
+	}
+
+	if (!host->dma_active && emm_int.s.buf_done && req->data) {
+		unsigned int type = (rsp_sts.u64 >> 7) & 3;
+
+		if (type == 1) {
+			/* Read */
+			int dbuf = rsp_sts.s.dbuf;
+			struct sg_mapping_iter *smi = &host->smi;
+			unsigned int data_len =
+				req->data->blksz * req->data->blocks;
+			unsigned int bytes_xfered;
+			u64 dat = 0;
+			int shift = -1;
+
+			/* Auto inc from offset zero */
+			cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
+				(u64)(0x10000 | (dbuf << 6)));
+
+			for (bytes_xfered = 0; bytes_xfered < data_len;) {
+				if (smi->consumed >= smi->length) {
+					if (!sg_miter_next(smi))
+						break;
+					smi->consumed = 0;
+				}
+				if (shift < 0) {
+					dat = cvmx_read_csr(host->base +
+						OCT_MIO_EMM_BUF_DAT);
+					shift = 56;
+				}
+
+				while (smi->consumed < smi->length &&
+					shift >= 0) {
+					((u8 *)(smi->addr))[smi->consumed] =
+						(dat >> shift) & 0xff;
+					bytes_xfered++;
+					smi->consumed++;
+					shift -= 8;
+				}
+			}
+			sg_miter_stop(smi);
+			req->data->bytes_xfered = bytes_xfered;
+			req->data->error = 0;
+		} else if (type == 2) {
+			/* write */
+			req->data->bytes_xfered = req->data->blksz *
+				req->data->blocks;
+			req->data->error = 0;
+		}
+	}
+	host_done = emm_int.s.cmd_done || emm_int.s.dma_done ||
+		emm_int.s.cmd_err || emm_int.s.dma_err;
+	if (host_done && req->done) {
+		if (rsp_sts.s.rsp_bad_sts ||
+		    rsp_sts.s.rsp_crc_err ||
+		    rsp_sts.s.rsp_timeout ||
+		    rsp_sts.s.blk_crc_err ||
+		    rsp_sts.s.blk_timeout ||
+		    rsp_sts.s.dbuf_err) {
+			req->cmd->error = -EILSEQ;
+		} else {
+			req->cmd->error = 0;
+		}
+
+		if (host->dma_active && req->data) {
+			req->data->error = 0;
+			req->data->bytes_xfered = req->data->blocks *
+				req->data->blksz;
+			if (!(req->data->flags & MMC_DATA_WRITE) &&
+				req->data->sg_len > 1) {
+				size_t r = sg_copy_from_buffer(req->data->sg,
+					req->data->sg_len, host->linear_buf,
+					req->data->bytes_xfered);
+				WARN_ON(r != req->data->bytes_xfered);
+			}
+		}
+		if (rsp_sts.s.rsp_val) {
+			u64 rsp_hi;
+			u64 rsp_lo = cvmx_read_csr(
+				host->base + OCT_MIO_EMM_RSP_LO);
+
+			switch (rsp_sts.s.rsp_type) {
+			case 1:
+			case 3:
+				req->cmd->resp[0] = (rsp_lo >> 8) & 0xffffffff;
+				req->cmd->resp[1] = 0;
+				req->cmd->resp[2] = 0;
+				req->cmd->resp[3] = 0;
+				break;
+			case 2:
+				req->cmd->resp[3] = rsp_lo & 0xffffffff;
+				req->cmd->resp[2] = (rsp_lo >> 32) & 0xffffffff;
+				rsp_hi = cvmx_read_csr(host->base +
+					OCT_MIO_EMM_RSP_HI);
+				req->cmd->resp[1] = rsp_hi & 0xffffffff;
+				req->cmd->resp[0] = (rsp_hi >> 32) & 0xffffffff;
+				break;
+			default:
+				octeon_mmc_dbg("octeon_mmc_interrupt unhandled rsp_val %d\n",
+					       rsp_sts.s.rsp_type);
+				break;
+			}
+			octeon_mmc_dbg("octeon_mmc_interrupt  resp %08x %08x %08x %08x\n",
+				       req->cmd->resp[0], req->cmd->resp[1],
+				       req->cmd->resp[2], req->cmd->resp[3]);
+		}
+		if (emm_int.s.dma_err && rsp_sts.s.dma_pend) {
+			/* Try to clean up failed DMA */
+			union cvmx_mio_emm_dma emm_dma;
+
+			emm_dma.u64 =
+				cvmx_read_csr(host->base + OCT_MIO_EMM_DMA);
+			emm_dma.s.dma_val = 1;
+			emm_dma.s.dat_null = 1;
+			emm_dma.s.bus_id = rsp_sts.s.bus_id;
+			cvmx_write_csr(host->base + OCT_MIO_EMM_DMA,
+				       emm_dma.u64);
+			host->dma_err_pending = true;
+			host_done = false;
+			goto no_req_done;
+		}
+
+		host->current_req = NULL;
+		req->done(req);
+	}
+no_req_done:
+	if (host->n_minus_one) {
+		l2c_unlock_mem_region(host->n_minus_one, 512);
+		host->n_minus_one = 0;
+	}
+	if (host_done)
+		octeon_mmc_release_bus(host);
+out:
+	if (host->need_irq_handler_lock)
+		spin_unlock_irqrestore(&host->irq_handler_lock, flags);
+	return IRQ_RETVAL(emm_int.u64 != 0);
+}
+
+static void octeon_mmc_switch_to(struct octeon_mmc_slot	*slot)
+{
+	struct octeon_mmc_host	*host = slot->host;
+	struct octeon_mmc_slot	*old_slot;
+	union cvmx_mio_emm_switch sw;
+	union cvmx_mio_emm_sample samp;
+
+	if (slot->bus_id == host->last_slot)
+		goto out;
+
+	if (host->last_slot >= 0) {
+		old_slot = host->slot[host->last_slot];
+		old_slot->cached_switch =
+			cvmx_read_csr(host->base + OCT_MIO_EMM_SWITCH);
+		old_slot->cached_rca =
+			cvmx_read_csr(host->base + OCT_MIO_EMM_RCA);
+	}
+	cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, slot->cached_rca);
+	sw.u64 = slot->cached_switch;
+	sw.s.bus_id = 0;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
+	sw.s.bus_id = slot->bus_id;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
+
+	samp.u64 = 0;
+	samp.s.cmd_cnt = slot->cmd_cnt;
+	samp.s.dat_cnt = slot->dat_cnt;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_SAMPLE, samp.u64);
+out:
+	host->last_slot = slot->bus_id;
+}
+
+static void octeon_mmc_dma_request(struct mmc_host *mmc,
+				   struct mmc_request *mrq)
+{
+	struct octeon_mmc_slot	*slot;
+	struct octeon_mmc_host	*host;
+	struct mmc_command *cmd;
+	struct mmc_data *data;
+	union cvmx_mio_emm_int emm_int;
+	union cvmx_mio_emm_dma emm_dma;
+	union cvmx_mio_ndf_dma_cfg dma_cfg;
+
+	cmd = mrq->cmd;
+	if (mrq->data == NULL || mrq->data->sg == NULL || !mrq->data->sg_len ||
+	    mrq->stop == NULL || mrq->stop->opcode != MMC_STOP_TRANSMISSION) {
+		dev_err(&mmc->card->dev,
+			"Error: octeon_mmc_dma_request no data\n");
+		cmd->error = -EINVAL;
+		if (mrq->done)
+			mrq->done(mrq);
+		return;
+	}
+
+	slot = mmc_priv(mmc);
+	host = slot->host;
+
+	/* Only a single user of the bootbus at a time. */
+	octeon_mmc_acquire_bus(host);
+
+	octeon_mmc_switch_to(slot);
+
+	data = mrq->data;
+
+	if (data->timeout_ns) {
+		cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+			octeon_mmc_timeout_to_wdog(slot, data->timeout_ns));
+		octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+			cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
+	}
+
+	WARN_ON(host->current_req);
+	host->current_req = mrq;
+
+	host->sg_idx = 0;
+
+	WARN_ON(data->blksz * data->blocks > host->linear_buf_size);
+
+	if ((data->flags & MMC_DATA_WRITE) && data->sg_len > 1) {
+		size_t r = sg_copy_to_buffer(data->sg, data->sg_len,
+			 host->linear_buf, data->blksz * data->blocks);
+		WARN_ON(data->blksz * data->blocks != r);
+	}
+
+	dma_cfg.u64 = 0;
+	dma_cfg.s.en = 1;
+	dma_cfg.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+#ifdef __LITTLE_ENDIAN
+	dma_cfg.s.endian = 1;
+#endif
+	dma_cfg.s.size = ((data->blksz * data->blocks) / 8) - 1;
+	if (!host->big_dma_addr) {
+		if (data->sg_len > 1)
+			dma_cfg.s.adr = virt_to_phys(host->linear_buf);
+		else
+			dma_cfg.s.adr = sg_phys(data->sg);
+	}
+	cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, dma_cfg.u64);
+	octeon_mmc_dbg("MIO_NDF_DMA_CFG: %016llx\n",
+		(unsigned long long)dma_cfg.u64);
+	if (host->big_dma_addr) {
+		u64 addr;
+
+		if (data->sg_len > 1)
+			addr = virt_to_phys(host->linear_buf);
+		else
+			addr = sg_phys(data->sg);
+		cvmx_write_csr(host->ndf_base + OCT_MIO_EMM_DMA_ADR, addr);
+		octeon_mmc_dbg("MIO_EMM_DMA_ADR: %016llx\n",
+			(unsigned long long)addr);
+	}
+
+	emm_dma.u64 = 0;
+	emm_dma.s.bus_id = slot->bus_id;
+	emm_dma.s.dma_val = 1;
+	emm_dma.s.sector = mmc_card_blockaddr(mmc->card) ? 1 : 0;
+	emm_dma.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+	if (mmc_card_mmc(mmc->card) ||
+	    (mmc_card_sd(mmc->card) &&
+		(mmc->card->scr.cmds & SD_SCR_CMD23_SUPPORT)))
+		emm_dma.s.multi = 1;
+	emm_dma.s.block_cnt = data->blocks;
+	emm_dma.s.card_addr = cmd->arg;
+
+	emm_int.u64 = 0;
+	emm_int.s.dma_done = 1;
+	emm_int.s.cmd_err = 1;
+	emm_int.s.dma_err = 1;
+	/* Clear the bit. */
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
+	host->dma_active = true;
+
+	if ((OCTEON_IS_MODEL(OCTEON_CN6XXX) ||
+		OCTEON_IS_MODEL(OCTEON_CNF7XXX)) &&
+	    cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK &&
+	    (data->blksz * data->blocks) > 1024) {
+		host->n_minus_one = dma_cfg.s.adr +
+			(data->blksz * data->blocks) - 1024;
+		l2c_lock_mem_region(host->n_minus_one, 512);
+	}
+
+	if (mmc->card && mmc_card_sd(mmc->card))
+		cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
+			0x00b00000ull);
+	else
+		cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
+			0xe4f90080ull);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_DMA, emm_dma.u64);
+	octeon_mmc_dbg("MIO_EMM_DMA: %llx\n", emm_dma.u64);
+}
+
+static void octeon_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct octeon_mmc_slot	*slot;
+	struct octeon_mmc_host	*host;
+	struct mmc_command *cmd;
+	union cvmx_mio_emm_int emm_int;
+	union cvmx_mio_emm_cmd emm_cmd;
+	struct octeon_mmc_cr_mods mods;
+
+	cmd = mrq->cmd;
+
+	if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
+		cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
+		octeon_mmc_dma_request(mmc, mrq);
+		return;
+	}
+
+	mods = octeon_mmc_get_cr_mods(cmd);
+
+	slot = mmc_priv(mmc);
+	host = slot->host;
+
+	/* Only a single user of the bootbus at a time. */
+	octeon_mmc_acquire_bus(host);
+
+	octeon_mmc_switch_to(slot);
+
+	WARN_ON(host->current_req);
+	host->current_req = mrq;
+
+	emm_int.u64 = 0;
+	emm_int.s.cmd_done = 1;
+	emm_int.s.cmd_err = 1;
+	if (cmd->data) {
+		octeon_mmc_dbg("command has data\n");
+		if (cmd->data->flags & MMC_DATA_READ) {
+			sg_miter_start(&host->smi, mrq->data->sg,
+				       mrq->data->sg_len,
+				       SG_MITER_ATOMIC | SG_MITER_TO_SG);
+		} else {
+			struct sg_mapping_iter *smi = &host->smi;
+			unsigned int data_len =
+				mrq->data->blksz * mrq->data->blocks;
+			unsigned int bytes_xfered;
+			u64 dat = 0;
+			int shift = 56;
+			/*
+			 * Copy data to the xmit buffer before
+			 * issuing the command
+			 */
+			sg_miter_start(smi, mrq->data->sg,
+				       mrq->data->sg_len, SG_MITER_FROM_SG);
+			/* Auto inc from offset zero, dbuf zero */
+			cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
+					0x10000ull);
+
+			for (bytes_xfered = 0; bytes_xfered < data_len;) {
+				if (smi->consumed >= smi->length) {
+					if (!sg_miter_next(smi))
+						break;
+					smi->consumed = 0;
+				}
+
+				while (smi->consumed < smi->length &&
+					shift >= 0) {
+
+					dat |= (u64)(((u8 *)(smi->addr))
+						[smi->consumed]) << shift;
+					bytes_xfered++;
+					smi->consumed++;
+					shift -= 8;
+				}
+				if (shift < 0) {
+					cvmx_write_csr(host->base +
+						OCT_MIO_EMM_BUF_DAT, dat);
+					shift = 56;
+					dat = 0;
+				}
+			}
+			sg_miter_stop(smi);
+		}
+		if (cmd->data->timeout_ns) {
+			cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+				octeon_mmc_timeout_to_wdog(slot,
+					cmd->data->timeout_ns));
+			octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+				       cvmx_read_csr(host->base +
+						OCT_MIO_EMM_WDOG));
+		}
+	} else {
+		cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+			       ((u64)slot->clock * 850ull) / 1000ull);
+		octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+			       cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
+	}
+	/* Clear the bit. */
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
+	host->dma_active = false;
+
+	emm_cmd.u64 = 0;
+	emm_cmd.s.cmd_val = 1;
+	emm_cmd.s.ctype_xor = mods.ctype_xor;
+	emm_cmd.s.rtype_xor = mods.rtype_xor;
+	if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+		emm_cmd.s.offset = 64 -
+			((cmd->data->blksz * cmd->data->blocks) / 8);
+	emm_cmd.s.bus_id = slot->bus_id;
+	emm_cmd.s.cmd_idx = cmd->opcode;
+	emm_cmd.s.arg = cmd->arg;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_CMD, emm_cmd.u64);
+	octeon_mmc_dbg("MIO_EMM_CMD: %llx\n", emm_cmd.u64);
+}
+
+static void octeon_mmc_reset_bus(struct octeon_mmc_slot *slot, int preserve)
+{
+	union cvmx_mio_emm_cfg emm_cfg;
+	union cvmx_mio_emm_switch emm_switch;
+	u64 wdog = 0;
+
+	emm_cfg.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_CFG);
+	if (preserve) {
+		emm_switch.u64 = cvmx_read_csr(slot->host->base +
+			OCT_MIO_EMM_SWITCH);
+		wdog = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_WDOG);
+	}
+
+	/* Restore switch settings */
+	if (preserve) {
+		emm_switch.s.switch_exe = 0;
+		emm_switch.s.switch_err0 = 0;
+		emm_switch.s.switch_err1 = 0;
+		emm_switch.s.switch_err2 = 0;
+		emm_switch.s.bus_id = 0;
+		cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH,
+				emm_switch.u64);
+		emm_switch.s.bus_id = slot->bus_id;
+		cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH,
+				emm_switch.u64);
+
+		slot->cached_switch = emm_switch.u64;
+
+		msleep(10);
+		cvmx_write_csr(slot->host->base + OCT_MIO_EMM_WDOG, wdog);
+	} else {
+		slot->cached_switch = 0;
+	}
+}
+
+static void octeon_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct octeon_mmc_slot	*slot;
+	struct octeon_mmc_host	*host;
+	int bus_width;
+	int clock;
+	bool ddr_clock;
+	int hs_timing;
+	int power_class = 10;
+	int clk_period;
+	int timeout = 2000;
+	union cvmx_mio_emm_switch emm_switch;
+	union cvmx_mio_emm_rsp_sts emm_sts;
+
+	slot = mmc_priv(mmc);
+	host = slot->host;
+
+	/* Only a single user of the bootbus at a time. */
+	octeon_mmc_acquire_bus(host);
+
+	octeon_mmc_switch_to(slot);
+
+	octeon_mmc_dbg("Calling set_ios: slot: clk = 0x%x, bus_width = %d\n",
+		       slot->clock, slot->bus_width);
+	octeon_mmc_dbg("Calling set_ios: ios: clk = 0x%x, vdd = %u, bus_width = %u, power_mode = %u, timing = %u\n",
+		       ios->clock, ios->vdd, ios->bus_width, ios->power_mode,
+		       ios->timing);
+	octeon_mmc_dbg("Calling set_ios: mmc: caps = 0x%x, bus_width = %d\n",
+		       mmc->caps, mmc->ios.bus_width);
+
+	/*
+	 * Reset the chip on each power off
+	 */
+	if (ios->power_mode == MMC_POWER_OFF) {
+		octeon_mmc_reset_bus(slot, 1);
+		if (slot->pwr_gpio >= 0)
+			gpio_set_value_cansleep(slot->pwr_gpio,
+						slot->pwr_gpio_low);
+	} else {
+		if (slot->pwr_gpio >= 0)
+			gpio_set_value_cansleep(slot->pwr_gpio,
+						!slot->pwr_gpio_low);
+	}
+
+	switch (ios->bus_width) {
+	case MMC_BUS_WIDTH_8:
+		bus_width = 2;
+		break;
+	case MMC_BUS_WIDTH_4:
+		bus_width = 1;
+		break;
+	case MMC_BUS_WIDTH_1:
+		bus_width = 0;
+		break;
+	default:
+		octeon_mmc_dbg("unknown bus width %d\n", ios->bus_width);
+		bus_width = 0;
+		break;
+	}
+
+	hs_timing = (ios->timing == MMC_TIMING_MMC_HS);
+	ddr_clock = (bus_width && ios->timing >= MMC_TIMING_UHS_DDR50);
+
+	if (ddr_clock)
+		bus_width |= 4;
+
+	if (ios->clock) {
+		slot->clock = ios->clock;
+		slot->bus_width = bus_width;
+
+		clock = slot->clock;
+
+		if (clock > 52000000)
+			clock = 52000000;
+
+		clk_period = (octeon_get_io_clock_rate() + clock - 1) /
+			(2 * clock);
+
+		/* until clock-renengotiate-on-CRC is in */
+		if (ddr_clock && ddr > 1)
+			clk_period *= 2;
+
+		emm_switch.u64 = 0;
+		emm_switch.s.hs_timing = hs_timing;
+		emm_switch.s.bus_width = bus_width;
+		emm_switch.s.power_class = power_class;
+		emm_switch.s.clk_hi = clk_period;
+		emm_switch.s.clk_lo = clk_period;
+
+		if (!octeon_mmc_switch_val_changed(slot, emm_switch.u64)) {
+			octeon_mmc_dbg("No change from 0x%llx mio_emm_switch, returning.\n",
+				       emm_switch.u64);
+			goto out;
+		}
+
+		octeon_mmc_dbg("Writing 0x%llx to mio_emm_wdog\n",
+			       ((u64)clock * 850ull) / 1000ull);
+		cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+			       ((u64)clock * 850ull) / 1000ull);
+		octeon_mmc_dbg("Writing 0x%llx to mio_emm_switch\n",
+				emm_switch.u64);
+
+		cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+		emm_switch.s.bus_id = slot->bus_id;
+		cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+		slot->cached_switch = emm_switch.u64;
+
+		do {
+			emm_sts.u64 =
+				cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
+			if (!emm_sts.s.switch_val)
+				break;
+			udelay(100);
+		} while (timeout-- > 0);
+
+		if (timeout <= 0) {
+			octeon_mmc_dbg("switch command timed out, status=0x%llx\n",
+				       emm_sts.u64);
+			goto out;
+		}
+	}
+out:
+	octeon_mmc_release_bus(host);
+}
+
+static int octeon_mmc_get_ro(struct mmc_host *mmc)
+{
+	struct octeon_mmc_slot	*slot = mmc_priv(mmc);
+
+	if (slot->ro_gpio >= 0) {
+		int pin = gpio_get_value_cansleep(slot->ro_gpio);
+
+		if (pin < 0)
+			return pin;
+		if (slot->ro_gpio_low)
+			pin = !pin;
+		return pin;
+	} else {
+		return -ENOSYS;
+	}
+}
+
+static int octeon_mmc_get_cd(struct mmc_host *mmc)
+{
+	struct octeon_mmc_slot	*slot = mmc_priv(mmc);
+
+	if (slot->cd_gpio >= 0) {
+		int pin = gpio_get_value_cansleep(slot->cd_gpio);
+
+		if (pin < 0)
+			return pin;
+		if (slot->cd_gpio_low)
+			pin = !pin;
+		return pin;
+	} else {
+		return -ENOSYS;
+	}
+}
+
+static const struct mmc_host_ops octeon_mmc_ops = {
+	.request        = octeon_mmc_request,
+	.set_ios        = octeon_mmc_set_ios,
+	.get_ro		= octeon_mmc_get_ro,
+	.get_cd		= octeon_mmc_get_cd,
+};
+
+static void octeon_mmc_set_clock(struct octeon_mmc_slot *slot,
+				 unsigned int clock)
+{
+	struct mmc_host *mmc = slot->mmc;
+
+	clock = min(clock, mmc->f_max);
+	clock = max(clock, mmc->f_min);
+	slot->clock = clock;
+}
+
+static int octeon_mmc_initlowlevel(struct octeon_mmc_slot *slot,
+				   int bus_width)
+{
+	union cvmx_mio_emm_switch emm_switch;
+	struct octeon_mmc_host *host = slot->host;
+
+	host->emm_cfg |= 1ull << slot->bus_id;
+	cvmx_write_csr(slot->host->base + OCT_MIO_EMM_CFG, host->emm_cfg);
+	octeon_mmc_set_clock(slot, 400000);
+
+	/* Program initial clock speed and power */
+	emm_switch.u64 = 0;
+	emm_switch.s.power_class = 10;
+	emm_switch.s.clk_hi = (slot->sclock / slot->clock) / 2;
+	emm_switch.s.clk_lo = (slot->sclock / slot->clock) / 2;
+
+	cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+	emm_switch.s.bus_id = slot->bus_id;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+	slot->cached_switch = emm_switch.u64;
+
+	cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+		       ((u64)slot->clock * 850ull) / 1000ull);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0xe4f90080ull);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, 1);
+	return 0;
+}
+
+static int __init octeon_init_slot(struct octeon_mmc_host *host, int id,
+				   int bus_width, int max_freq,
+				   int ro_gpio, int cd_gpio, int pwr_gpio,
+				   bool ro_low, bool cd_low, bool power_low,
+				   u32 cmd_skew, u32 dat_skew)
+{
+	struct mmc_host *mmc;
+	struct octeon_mmc_slot *slot;
+	u64 clock_period;
+	int ret;
+
+	/*
+	 * Allocate MMC structue
+	 */
+	mmc = mmc_alloc_host(sizeof(struct octeon_mmc_slot), &host->pdev->dev);
+	if (!mmc) {
+		dev_err(&host->pdev->dev, "alloc host failed\n");
+		return -ENOMEM;
+	}
+
+	slot = mmc_priv(mmc);
+	slot->mmc = mmc;
+	slot->host = host;
+	slot->ro_gpio = ro_gpio;
+	slot->cd_gpio = cd_gpio;
+	slot->pwr_gpio = pwr_gpio;
+	slot->ro_gpio_low = ro_low;
+	slot->cd_gpio_low = cd_low;
+	slot->pwr_gpio_low = power_low;
+
+	if (slot->ro_gpio >= 0) {
+		ret = gpio_request(slot->ro_gpio, "mmc_ro");
+		if (ret) {
+			dev_err(&host->pdev->dev,
+				"Could not request mmc_ro GPIO %d\n",
+				slot->ro_gpio);
+			return ret;
+		}
+		gpio_direction_input(slot->ro_gpio);
+	}
+	if (slot->cd_gpio >= 0) {
+		ret = gpio_request(slot->cd_gpio, "mmc_card_detect");
+		if (ret) {
+			if (slot->ro_gpio >= 0)
+				gpio_free(slot->ro_gpio);
+			dev_err(&host->pdev->dev, "Could not request mmc_card_detect GPIO %d\n",
+				slot->cd_gpio);
+			return ret;
+		}
+		gpio_direction_input(slot->cd_gpio);
+	}
+	if (slot->pwr_gpio >= 0) {
+		ret = gpio_request(slot->pwr_gpio, "mmc_power");
+		if (ret) {
+			dev_err(&host->pdev->dev,
+				"Could not request mmc_power GPIO %d\n",
+				slot->pwr_gpio);
+			if (slot->ro_gpio >= 0)
+				gpio_free(slot->ro_gpio);
+			if (slot->cd_gpio)
+				gpio_free(slot->cd_gpio);
+			return ret;
+		}
+		octeon_mmc_dbg("%s: Shutting off power to slot %d via gpio %d\n",
+			       DRV_NAME, slot->bus_id, slot->pwr_gpio);
+		gpio_direction_output(slot->pwr_gpio,
+				      slot->pwr_gpio_low);
+	}
+	/*
+	 * Set up host parameters.
+	 */
+	mmc->ops = &octeon_mmc_ops;
+	mmc->f_min = 400000;
+	mmc->f_max = max_freq;
+	mmc->caps = MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
+		    MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA |
+		    MMC_CAP_ERASE;
+	mmc->ocr_avail = MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 |
+			 MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 |
+			 MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36;
+
+	/* post-sdk23 caps */
+	mmc->caps |=
+		((mmc->f_max >= 12000000) * MMC_CAP_UHS_SDR12) |
+		((mmc->f_max >= 25000000) * MMC_CAP_UHS_SDR25) |
+		((mmc->f_max >= 50000000) * MMC_CAP_UHS_SDR50) |
+		MMC_CAP_CMD23;
+
+	if (host->global_pwr_gpio >= 0)
+		mmc->caps |= MMC_CAP_POWER_OFF_CARD;
+
+	/* "1.8v" capability is actually 1.8-or-3.3v */
+	if (ddr)
+		mmc->caps |= MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR;
+
+	mmc->max_segs = 64;
+	mmc->max_seg_size = host->linear_buf_size;
+	mmc->max_req_size = host->linear_buf_size;
+	mmc->max_blk_size = 512;
+	mmc->max_blk_count = mmc->max_req_size / 512;
+
+	slot->clock = mmc->f_min;
+	slot->sclock = octeon_get_io_clock_rate();
+
+	clock_period = 1000000000000ull / slot->sclock; /* period in pS */
+	slot->cmd_cnt = (cmd_skew + clock_period / 2) / clock_period;
+	slot->dat_cnt = (dat_skew + clock_period / 2) / clock_period;
+
+	slot->bus_width = bus_width;
+	slot->bus_id = id;
+	slot->cached_rca = 1;
+
+	/* Only a single user of the bootbus at a time. */
+	octeon_mmc_acquire_bus(host);
+	host->slot[id] = slot;
+
+	octeon_mmc_switch_to(slot);
+	/* Initialize MMC Block. */
+	octeon_mmc_initlowlevel(slot, bus_width);
+
+	octeon_mmc_release_bus(host);
+
+	ret = mmc_add_host(mmc);
+	octeon_mmc_dbg("mmc_add_host returned %d\n", ret);
+
+	return 0;
+}
+
+static int octeon_mmc_probe(struct platform_device *pdev)
+{
+	union cvmx_mio_emm_cfg emm_cfg;
+	struct octeon_mmc_host *host;
+	struct resource	*res;
+	void __iomem *base;
+	int mmc_irq[9];
+	int i;
+	int ret = 0;
+	struct device_node *node = pdev->dev.of_node;
+	bool cn78xx_style;
+	u64 t;
+	enum of_gpio_flags f;
+
+	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+	if (!host)
+		return -ENOMEM;
+
+	spin_lock_init(&host->irq_handler_lock);
+	sema_init(&host->mmc_serializer, 1);
+
+	cn78xx_style = of_device_is_compatible(node, "cavium,octeon-7890-mmc");
+	if (cn78xx_style) {
+		host->need_bootbus_lock = false;
+		host->big_dma_addr = true;
+		host->need_irq_handler_lock = true;
+		/*
+		 * First seven are the EMM_INT bits 0..6, then two for
+		 * the EMM_DMA_INT bits
+		 */
+		for (i = 0; i < 9; i++) {
+			mmc_irq[i] = platform_get_irq(pdev, i);
+			if (mmc_irq[i] < 0)
+				return mmc_irq[i];
+		}
+	} else {
+		host->need_bootbus_lock = true;
+		host->big_dma_addr = false;
+		host->need_irq_handler_lock = false;
+		/* First one is EMM second NDF_DMA */
+		for (i = 0; i < 2; i++) {
+			mmc_irq[i] = platform_get_irq(pdev, i);
+			if (mmc_irq[i] < 0)
+				return mmc_irq[i];
+		}
+	}
+	host->last_slot = -1;
+
+	if (bb_size < 512 || bb_size >= (1 << 24))
+		bb_size = 1 << 16;
+	host->linear_buf_size = bb_size;
+	host->linear_buf = devm_kzalloc(&pdev->dev, host->linear_buf_size,
+					GFP_KERNEL);
+
+	if (!host->linear_buf) {
+		dev_err(&pdev->dev, "devm_kzalloc failed\n");
+		return -ENOMEM;
+	}
+
+	host->pdev = pdev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "Platform resource[0] is missing\n");
+		return -ENXIO;
+	}
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+	host->base = (u64)base;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {
+		dev_err(&pdev->dev, "Platform resource[1] is missing\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base)) {
+		ret = PTR_ERR(base);
+		goto err;
+	}
+	host->ndf_base = (u64)base;
+	/*
+	 * Clear out any pending interrupts that may be left over from
+	 * bootloader.
+	 */
+	t = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
+	cvmx_write_csr(host->base + OCT_MIO_EMM_INT, t);
+	if (cn78xx_style) {
+		/* Only CMD_DONE, DMA_DONE, CMD_ERR, DMA_ERR */
+		for (i = 1; i <= 4; i++) {
+			ret = devm_request_irq(&pdev->dev, mmc_irq[i],
+					       octeon_mmc_interrupt,
+					       0, DRV_NAME, host);
+			if (ret < 0) {
+				dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
+					mmc_irq[i]);
+				goto err;
+			}
+		}
+	} else {
+		ret = devm_request_irq(&pdev->dev, mmc_irq[0],
+				       octeon_mmc_interrupt, 0, DRV_NAME, host);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
+				mmc_irq[0]);
+			goto err;
+		}
+	}
+
+	ret = of_get_named_gpio_flags(node, "power-gpios", 0, &f);
+	if (ret == -EPROBE_DEFER)
+		goto err;
+
+	host->global_pwr_gpio = ret;
+	host->global_pwr_gpio_low =
+		(host->global_pwr_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+
+	if (host->global_pwr_gpio >= 0) {
+		ret = gpio_request(host->global_pwr_gpio, "mmc global power");
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Could not request mmc global power gpio %d\n",
+				host->global_pwr_gpio);
+			goto err;
+		}
+		dev_dbg(&pdev->dev, "Global power on\n");
+		gpio_direction_output(host->global_pwr_gpio,
+				      !host->global_pwr_gpio_low);
+	}
+
+	platform_set_drvdata(pdev, host);
+
+	for_each_child_of_node(pdev->dev.of_node, node) {
+
+		int r;
+		u32 slot;
+		int ro_gpio, cd_gpio, pwr_gpio;
+		bool ro_low, cd_low, pwr_low;
+		u32 bus_width, max_freq, cmd_skew, dat_skew;
+
+		if (!of_device_is_compatible(node,
+					     "cavium,octeon-6130-mmc-slot")) {
+			pr_warn("Sub node isn't slot: %s\n",
+				of_node_full_name(node));
+			continue;
+		}
+
+		if (of_property_read_u32(node, "reg", &slot) != 0) {
+			pr_warn("Missing or invalid reg property on %s\n",
+				of_node_full_name(node));
+			continue;
+		}
+
+		r = of_property_read_u32(node, "cavium,bus-max-width",
+					 &bus_width);
+		if (r) {
+			bus_width = 8;
+			pr_info("Bus width not found for slot %d, defaulting to %d\n",
+				slot, bus_width);
+		} else {
+			switch (bus_width) {
+			case 1:
+			case 4:
+			case 8:
+				break;
+			default:
+				pr_warn("Invalid bus width property for slot %d\n",
+					slot);
+				continue;
+			}
+		}
+
+		r = of_property_read_u32(node, "cavium,cmd-clk-skew",
+					 &cmd_skew);
+		if (r)
+			cmd_skew = 0;
+
+		r = of_property_read_u32(node, "cavium,dat-clk-skew",
+					 &dat_skew);
+		if (r)
+			dat_skew = 0;
+
+		r = of_property_read_u32(node, "spi-max-frequency", &max_freq);
+		if (r) {
+			max_freq = 52000000;
+			pr_info("No spi-max-frequency for slot %d, defaulting to %d\n",
+				slot, max_freq);
+		}
+
+		ro_gpio = of_get_named_gpio_flags(node, "wp-gpios", 0, &f);
+		ro_low = (ro_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+		cd_gpio = of_get_named_gpio_flags(node, "cd-gpios", 0, &f);
+		cd_low = (cd_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+		pwr_gpio = of_get_named_gpio_flags(node, "power-gpios", 0, &f);
+		pwr_low = (pwr_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+
+		ret = octeon_init_slot(host, slot, bus_width, max_freq,
+				       ro_gpio, cd_gpio, pwr_gpio,
+				       ro_low, cd_low, pwr_low,
+				       cmd_skew, dat_skew);
+		octeon_mmc_dbg("init slot %d, ret = %d\n", slot, ret);
+		if (ret)
+			goto err;
+	}
+
+	return ret;
+
+err:
+	dev_err(&pdev->dev, "Probe failed: %d\n", ret);
+
+	/* Disable MMC controller */
+	emm_cfg.s.bus_ena = 0;
+	cvmx_write_csr(host->base + OCT_MIO_EMM_CFG, emm_cfg.u64);
+
+	if (host->global_pwr_gpio >= 0) {
+		dev_dbg(&pdev->dev, "Global power off\n");
+		gpio_set_value_cansleep(host->global_pwr_gpio,
+					host->global_pwr_gpio_low);
+		gpio_free(host->global_pwr_gpio);
+	}
+
+	return ret;
+}
+
+static int octeon_mmc_remove(struct platform_device *pdev)
+{
+	union cvmx_mio_ndf_dma_cfg ndf_dma_cfg;
+	struct octeon_mmc_host *host = platform_get_drvdata(pdev);
+	struct octeon_mmc_slot *slot;
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (host) {
+		int i;
+
+		/* quench all users */
+		for (i = 0; i < OCTEON_MAX_MMC; i++) {
+			slot = host->slot[i];
+			if (slot)
+				mmc_remove_host(slot->mmc);
+		}
+
+		/* Reset bus_id */
+		ndf_dma_cfg.u64 =
+			cvmx_read_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG);
+		ndf_dma_cfg.s.en = 0;
+		cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG,
+			       ndf_dma_cfg.u64);
+
+		for (i = 0; i < OCTEON_MAX_MMC; i++) {
+			struct octeon_mmc_slot *slot;
+
+			slot = host->slot[i];
+			if (!slot)
+				continue;
+			/* Free the GPIOs */
+			if (slot->ro_gpio >= 0)
+				gpio_free(slot->ro_gpio);
+			if (slot->cd_gpio >= 0)
+				gpio_free(slot->cd_gpio);
+			if (slot->pwr_gpio >= 0) {
+				gpio_set_value_cansleep(slot->pwr_gpio,
+							slot->pwr_gpio_low);
+				gpio_free(slot->pwr_gpio);
+			}
+		}
+
+		if (host->global_pwr_gpio >= 0) {
+			dev_dbg(&pdev->dev, "Global power off\n");
+			gpio_set_value_cansleep(host->global_pwr_gpio,
+						host->global_pwr_gpio_low);
+			gpio_free(host->global_pwr_gpio);
+		}
+
+		for (i = 0; i < OCTEON_MAX_MMC; i++) {
+			slot = host->slot[i];
+			if (slot)
+				mmc_free_host(slot->mmc);
+		}
+
+	}
+	return 0;
+}
+
+static struct of_device_id octeon_mmc_match[] = {
+	{
+		.compatible = "cavium,octeon-6130-mmc",
+	},
+	{
+		.compatible = "cavium,octeon-7890-mmc",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, octeon_mmc_match);
+
+static struct platform_driver octeon_mmc_driver = {
+	.probe		= octeon_mmc_probe,
+	.remove		= octeon_mmc_remove,
+	.driver		= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table = octeon_mmc_match,
+	},
+};
+
+static int __init octeon_mmc_init(void)
+{
+	int ret;
+
+	octeon_mmc_dbg("calling octeon_mmc_init\n");
+
+	ret = platform_driver_register(&octeon_mmc_driver);
+	octeon_mmc_dbg("driver probe returned %d\n", ret);
+
+	if (ret)
+		pr_err("%s: Failed to register driver\n", DRV_NAME);
+
+	return ret;
+}
+
+static void __exit octeon_mmc_cleanup(void)
+{
+	/* Unregister MMC driver */
+	platform_driver_unregister(&octeon_mmc_driver);
+}
+
+module_init(octeon_mmc_init);
+module_exit(octeon_mmc_cleanup);
+
+MODULE_AUTHOR("Cavium Inc. <support@cavium.com>");
+MODULE_DESCRIPTION("low-level driver for Cavium OCTEON MMC/SSD card");
+MODULE_LICENSE("GPL");