path: root/kernel/drivers/fpga/socfpga.c

/*
 * FPGA Manager Driver for Altera SOCFPGA
 *
 *  Copyright (C) 2013-2015 Altera Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
 */
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/pm.h>

/* Register offsets */
#define SOCFPGA_FPGMGR_STAT_OFST				0x0
#define SOCFPGA_FPGMGR_CTL_OFST					0x4
#define SOCFPGA_FPGMGR_DCLKCNT_OFST				0x8
#define SOCFPGA_FPGMGR_DCLKSTAT_OFST				0xc
#define SOCFPGA_FPGMGR_GPIO_INTEN_OFST				0x830
#define SOCFPGA_FPGMGR_GPIO_INTMSK_OFST				0x834
#define SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST			0x838
#define SOCFPGA_FPGMGR_GPIO_INT_POL_OFST			0x83c
#define SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST			0x840
#define SOCFPGA_FPGMGR_GPIO_RAW_INTSTAT_OFST			0x844
#define SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST			0x84c
#define SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST			0x850

/* Register bit defines */
/* SOCFPGA_FPGMGR_STAT register mode field values */
#define SOCFPGA_FPGMGR_STAT_POWER_UP				0x0 /*ramping*/
#define SOCFPGA_FPGMGR_STAT_RESET				0x1
#define SOCFPGA_FPGMGR_STAT_CFG					0x2
#define SOCFPGA_FPGMGR_STAT_INIT				0x3
#define SOCFPGA_FPGMGR_STAT_USER_MODE				0x4
#define SOCFPGA_FPGMGR_STAT_UNKNOWN				0x5
#define SOCFPGA_FPGMGR_STAT_STATE_MASK				0x7
/* This is a flag value that doesn't really happen in this register field */
#define SOCFPGA_FPGMGR_STAT_POWER_OFF				0x0

#define MSEL_PP16_FAST_NOAES_NODC				0x0
#define MSEL_PP16_FAST_AES_NODC					0x1
#define MSEL_PP16_FAST_AESOPT_DC				0x2
#define MSEL_PP16_SLOW_NOAES_NODC				0x4
#define MSEL_PP16_SLOW_AES_NODC					0x5
#define MSEL_PP16_SLOW_AESOPT_DC				0x6
#define MSEL_PP32_FAST_NOAES_NODC				0x8
#define MSEL_PP32_FAST_AES_NODC					0x9
#define MSEL_PP32_FAST_AESOPT_DC				0xa
#define MSEL_PP32_SLOW_NOAES_NODC				0xc
#define MSEL_PP32_SLOW_AES_NODC					0xd
#define MSEL_PP32_SLOW_AESOPT_DC				0xe
#define SOCFPGA_FPGMGR_STAT_MSEL_MASK				0x000000f8
#define SOCFPGA_FPGMGR_STAT_MSEL_SHIFT				3

/* SOCFPGA_FPGMGR_CTL register */
#define SOCFPGA_FPGMGR_CTL_EN					0x00000001
#define SOCFPGA_FPGMGR_CTL_NCE					0x00000002
#define SOCFPGA_FPGMGR_CTL_NCFGPULL				0x00000004

#define CDRATIO_X1						0x00000000
#define CDRATIO_X2						0x00000040
#define CDRATIO_X4						0x00000080
#define CDRATIO_X8						0x000000c0
#define SOCFPGA_FPGMGR_CTL_CDRATIO_MASK				0x000000c0

#define SOCFPGA_FPGMGR_CTL_AXICFGEN				0x00000100

#define CFGWDTH_16						0x00000000
#define CFGWDTH_32						0x00000200
#define SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK				0x00000200

/* SOCFPGA_FPGMGR_DCLKSTAT register */
#define SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE			0x1

/* SOCFPGA_FPGMGR_GPIO_* registers share the same bit positions */
#define SOCFPGA_FPGMGR_MON_NSTATUS				0x0001
#define SOCFPGA_FPGMGR_MON_CONF_DONE				0x0002
#define SOCFPGA_FPGMGR_MON_INIT_DONE				0x0004
#define SOCFPGA_FPGMGR_MON_CRC_ERROR				0x0008
#define SOCFPGA_FPGMGR_MON_CVP_CONF_DONE			0x0010
#define SOCFPGA_FPGMGR_MON_PR_READY				0x0020
#define SOCFPGA_FPGMGR_MON_PR_ERROR				0x0040
#define SOCFPGA_FPGMGR_MON_PR_DONE				0x0080
#define SOCFPGA_FPGMGR_MON_NCONFIG_PIN				0x0100
#define SOCFPGA_FPGMGR_MON_NSTATUS_PIN				0x0200
#define SOCFPGA_FPGMGR_MON_CONF_DONE_PIN			0x0400
#define SOCFPGA_FPGMGR_MON_FPGA_POWER_ON			0x0800
#define SOCFPGA_FPGMGR_MON_STATUS_MASK				0x0fff

#define SOCFPGA_FPGMGR_NUM_SUPPLIES 3
#define SOCFPGA_RESUME_TIMEOUT 3

/* In power-up order. Reverse for power-down. */
static const char *supply_names[SOCFPGA_FPGMGR_NUM_SUPPLIES] __maybe_unused = {
	"FPGA-1.5V",
	"FPGA-1.1V",
	"FPGA-2.5V",
};

struct socfpga_fpga_priv {
	void __iomem *fpga_base_addr;
	void __iomem *fpga_data_addr;
	struct completion status_complete;
	int irq;
};

struct cfgmgr_mode {
	/* Values to set in the CTRL register */
	u32 ctrl;

	/* flag that this table entry is a valid mode */
	bool valid;
};

/* For SOCFPGA_FPGMGR_STAT_MSEL field */
static struct cfgmgr_mode cfgmgr_modes[] = {
	[MSEL_PP16_FAST_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
	[MSEL_PP16_FAST_AES_NODC] =   { CFGWDTH_16 | CDRATIO_X2, 1 },
	[MSEL_PP16_FAST_AESOPT_DC] =  { CFGWDTH_16 | CDRATIO_X4, 1 },
	[MSEL_PP16_SLOW_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
	[MSEL_PP16_SLOW_AES_NODC] =   { CFGWDTH_16 | CDRATIO_X2, 1 },
	[MSEL_PP16_SLOW_AESOPT_DC] =  { CFGWDTH_16 | CDRATIO_X4, 1 },
	[MSEL_PP32_FAST_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
	[MSEL_PP32_FAST_AES_NODC] =   { CFGWDTH_32 | CDRATIO_X4, 1 },
	[MSEL_PP32_FAST_AESOPT_DC] =  { CFGWDTH_32 | CDRATIO_X8, 1 },
	[MSEL_PP32_SLOW_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
	[MSEL_PP32_SLOW_AES_NODC] =   { CFGWDTH_32 | CDRATIO_X4, 1 },
	[MSEL_PP32_SLOW_AESOPT_DC] =  { CFGWDTH_32 | CDRATIO_X8, 1 },
};

static u32 socfpga_fpga_readl(struct socfpga_fpga_priv *priv, u32 reg_offset)
{
	return readl(priv->fpga_base_addr + reg_offset);
}

static void socfpga_fpga_writel(struct socfpga_fpga_priv *priv, u32 reg_offset,
				u32 value)
{
	writel(value, priv->fpga_base_addr + reg_offset);
}

static u32 socfpga_fpga_raw_readl(struct socfpga_fpga_priv *priv,
				  u32 reg_offset)
{
	return __raw_readl(priv->fpga_base_addr + reg_offset);
}

static void socfpga_fpga_raw_writel(struct socfpga_fpga_priv *priv,
				    u32 reg_offset, u32 value)
{
	__raw_writel(value, priv->fpga_base_addr + reg_offset);
}

static void socfpga_fpga_data_writel(struct socfpga_fpga_priv *priv, u32 value)
{
	writel(value, priv->fpga_data_addr);
}

static inline void socfpga_fpga_set_bitsl(struct socfpga_fpga_priv *priv,
					  u32 offset, u32 bits)
{
	u32 val;

	val = socfpga_fpga_readl(priv, offset);
	val |= bits;
	socfpga_fpga_writel(priv, offset, val);
}

static inline void socfpga_fpga_clr_bitsl(struct socfpga_fpga_priv *priv,
					  u32 offset, u32 bits)
{
	u32 val;

	val = socfpga_fpga_readl(priv, offset);
	val &= ~bits;
	socfpga_fpga_writel(priv, offset, val);
}

static u32 socfpga_fpga_mon_status_get(struct socfpga_fpga_priv *priv)
{
	return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST) &
		SOCFPGA_FPGMGR_MON_STATUS_MASK;
}

static u32 socfpga_fpga_state_get(struct socfpga_fpga_priv *priv)
{
	u32 status = socfpga_fpga_mon_status_get(priv);

	if ((status & SOCFPGA_FPGMGR_MON_FPGA_POWER_ON) == 0)
		return SOCFPGA_FPGMGR_STAT_POWER_OFF;

	return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST) &
		SOCFPGA_FPGMGR_STAT_STATE_MASK;
}

static void socfpga_fpga_clear_done_status(struct socfpga_fpga_priv *priv)
{
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST,
			    SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE);
}

/*
 * Set the DCLKCNT, wait for DCLKSTAT to report the count completed, and clear
 * the complete status.
 */
static int socfpga_fpga_dclk_set_and_wait_clear(struct socfpga_fpga_priv *priv,
						u32 count)
{
	int timeout = 2;
	u32 done;

	/* Clear any existing DONE status. */
	if (socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST))
		socfpga_fpga_clear_done_status(priv);

	/* Issue the DCLK count. */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKCNT_OFST, count);

	/* Poll DCLKSTAT to see if it completed in the timeout period. */
	do {
		done = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST);
		if (done == SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE) {
			socfpga_fpga_clear_done_status(priv);
			return 0;
		}
		udelay(1);
	} while (timeout--);

	return -ETIMEDOUT;
}

static int socfpga_fpga_wait_for_state(struct socfpga_fpga_priv *priv,
				       u32 state)
{
	int timeout = 2;

	/*
	 * HW doesn't support an interrupt for changes in state, so poll to see
	 * if it matches the requested state within the timeout period.
	 */
	do {
		if ((socfpga_fpga_state_get(priv) & state) != 0)
			return 0;
		msleep(20);
	} while (timeout--);

	return -ETIMEDOUT;
}

static void socfpga_fpga_enable_irqs(struct socfpga_fpga_priv *priv, u32 irqs)
{
	/* set irqs to level sensitive */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST, 0);

	/* set interrupt polarity */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INT_POL_OFST, irqs);

	/* clear irqs */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);

	/* unmask interrupts */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTMSK_OFST, 0);

	/* enable interrupts */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, irqs);
}

static void socfpga_fpga_disable_irqs(struct socfpga_fpga_priv *priv)
{
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
}

static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id)
{
	struct socfpga_fpga_priv *priv = dev_id;
	u32 irqs, st;
	bool conf_done, nstatus;

	/* clear irqs */
	irqs = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST);

	socfpga_fpga_raw_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);

	st = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST);
	conf_done = (st & SOCFPGA_FPGMGR_MON_CONF_DONE) != 0;
	nstatus = (st & SOCFPGA_FPGMGR_MON_NSTATUS) != 0;

	/* success */
	if (conf_done && nstatus) {
		/* disable irqs */
		socfpga_fpga_raw_writel(priv,
					SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
		complete(&priv->status_complete);
	}

	return IRQ_HANDLED;
}

static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv)
{
	int timeout, ret = 0;

	socfpga_fpga_disable_irqs(priv);
	init_completion(&priv->status_complete);
	socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE);

	timeout = wait_for_completion_interruptible_timeout(
						&priv->status_complete,
						msecs_to_jiffies(10));
	if (timeout == 0)
		ret = -ETIMEDOUT;

	socfpga_fpga_disable_irqs(priv);
	return ret;
}

static int socfpga_fpga_cfg_mode_get(struct socfpga_fpga_priv *priv)
{
	u32 msel;

	msel = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST);
	msel &= SOCFPGA_FPGMGR_STAT_MSEL_MASK;
	msel >>= SOCFPGA_FPGMGR_STAT_MSEL_SHIFT;

	/* Check that this MSEL setting is supported */
	if ((msel >= ARRAY_SIZE(cfgmgr_modes)) || !cfgmgr_modes[msel].valid)
		return -EINVAL;

	return msel;
}

static int socfpga_fpga_cfg_mode_set(struct socfpga_fpga_priv *priv)
{
	u32 ctrl_reg;
	int mode;

	/* get value from MSEL pins */
	mode = socfpga_fpga_cfg_mode_get(priv);
	if (mode < 0)
		return mode;

	/* Adjust CTRL for the CDRATIO */
	ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
	ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CDRATIO_MASK;
	ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK;
	ctrl_reg |= cfgmgr_modes[mode].ctrl;

	/* Set NCE to 0. */
	ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCE;
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);

	return 0;
}

static int socfpga_fpga_reset(struct fpga_manager *mgr)
{
	struct socfpga_fpga_priv *priv = mgr->priv;
	u32 ctrl_reg, status;
	int ret;

	/*
	 * Step 1:
	 *  - Set CTRL.CFGWDTH, CTRL.CDRATIO to match cfg mode
	 *  - Set CTRL.NCE to 0
	 */
	ret = socfpga_fpga_cfg_mode_set(priv);
	if (ret)
		return ret;

	/* Step 2: Set CTRL.EN to 1 */
	socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
			       SOCFPGA_FPGMGR_CTL_EN);

	/* Step 3: Set CTRL.NCONFIGPULL to 1 to put FPGA in reset */
	ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
	ctrl_reg |= SOCFPGA_FPGMGR_CTL_NCFGPULL;
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);

	/* Step 4: Wait for STATUS.MODE to report FPGA is in reset phase */
	status = socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_RESET);

	/* Step 5: Set CONTROL.NCONFIGPULL to 0 to release FPGA from reset */
	ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCFGPULL;
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);

	/* Timeout waiting for reset */
	if (status)
		return -ETIMEDOUT;

	return 0;
}

/*
 * Prepare the FPGA to receive the configuration data.
 */
static int socfpga_fpga_ops_configure_init(struct fpga_manager *mgr, u32 flags,
					   const char *buf, size_t count)
{
	struct socfpga_fpga_priv *priv = mgr->priv;
	int ret;

	if (flags & FPGA_MGR_PARTIAL_RECONFIG) {
		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
		return -EINVAL;
	}
	/* Steps 1 - 5: Reset the FPGA */
	ret = socfpga_fpga_reset(mgr);
	if (ret)
		return ret;

	/* Step 6: Wait for FPGA to enter configuration phase */
	if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_CFG))
		return -ETIMEDOUT;

	/* Step 7: Clear nSTATUS interrupt */
	socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST,
			    SOCFPGA_FPGMGR_MON_NSTATUS);

	/* Step 8: Set CTRL.AXICFGEN to 1 to enable transfer of config data */
	socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
			       SOCFPGA_FPGMGR_CTL_AXICFGEN);

	return 0;
}

/*
 * Step 9: write data to the FPGA data register
 */
static int socfpga_fpga_ops_configure_write(struct fpga_manager *mgr,
					    const char *buf, size_t count)
{
	struct socfpga_fpga_priv *priv = mgr->priv;
	u32 *buffer_32 = (u32 *)buf;
	size_t i = 0;

	if (count <= 0)
		return -EINVAL;

	/* Write out the complete 32-bit chunks. */
	while (count >= sizeof(u32)) {
		socfpga_fpga_data_writel(priv, buffer_32[i++]);
		count -= sizeof(u32);
	}

	/* Write out remaining non 32-bit chunks. */
	switch (count) {
	case 3:
		socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x00ffffff);
		break;
	case 2:
		socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x0000ffff);
		break;
	case 1:
		socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x000000ff);
		break;
	case 0:
		break;
	default:
		/* This will never happen. */
		return -EFAULT;
	}

	return 0;
}

static int socfpga_fpga_ops_configure_complete(struct fpga_manager *mgr,
					       u32 flags)
{
	struct socfpga_fpga_priv *priv = mgr->priv;
	u32 status;

	/*
	 * Step 10:
	 *  - Observe CONF_DONE and nSTATUS (active low)
	 *  - if CONF_DONE = 1 and nSTATUS = 1, configuration was successful
	 *  - if CONF_DONE = 0 and nSTATUS = 0, configuration failed
	 */
	status = socfpga_fpga_wait_for_config_done(priv);
	if (status)
		return status;

	/* Step 11: Clear CTRL.AXICFGEN to disable transfer of config data */
	socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
			       SOCFPGA_FPGMGR_CTL_AXICFGEN);

	/*
	 * Step 12:
	 *  - Write 4 to DCLKCNT
	 *  - Wait for STATUS.DCNTDONE = 1
	 *  - Clear W1C bit in STATUS.DCNTDONE
	 */
	if (socfpga_fpga_dclk_set_and_wait_clear(priv, 4))
		return -ETIMEDOUT;

	/* Step 13: Wait for STATUS.MODE to report USER MODE */
	if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_USER_MODE))
		return -ETIMEDOUT;

	/* Step 14: Set CTRL.EN to 0 */
	socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
			       SOCFPGA_FPGMGR_CTL_EN);

	return 0;
}

/* Translate state register values to FPGA framework state */
static const enum fpga_mgr_states socfpga_state_to_framework_state[] = {
	[SOCFPGA_FPGMGR_STAT_POWER_OFF] = FPGA_MGR_STATE_POWER_OFF,
	[SOCFPGA_FPGMGR_STAT_RESET] = FPGA_MGR_STATE_RESET,
	[SOCFPGA_FPGMGR_STAT_CFG] = FPGA_MGR_STATE_WRITE_INIT,
	[SOCFPGA_FPGMGR_STAT_INIT] = FPGA_MGR_STATE_WRITE_INIT,
	[SOCFPGA_FPGMGR_STAT_USER_MODE] = FPGA_MGR_STATE_OPERATING,
	[SOCFPGA_FPGMGR_STAT_UNKNOWN] = FPGA_MGR_STATE_UNKNOWN,
};

static enum fpga_mgr_states socfpga_fpga_ops_state(struct fpga_manager *mgr)
{
	struct socfpga_fpga_priv *priv = mgr->priv;
	enum fpga_mgr_states ret;
	u32 state;

	state = socfpga_fpga_state_get(priv);

	if (state < ARRAY_SIZE(socfpga_state_to_framework_state))
		ret = socfpga_state_to_framework_state[state];
	else
		ret = FPGA_MGR_STATE_UNKNOWN;

	return ret;
}

static const struct fpga_manager_ops socfpga_fpga_ops = {
	.state = socfpga_fpga_ops_state,
	.write_init = socfpga_fpga_ops_configure_init,
	.write = socfpga_fpga_ops_configure_write,
	.write_complete = socfpga_fpga_ops_configure_complete,
};

static int socfpga_fpga_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct socfpga_fpga_priv *priv;
	struct resource *res;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->fpga_base_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->fpga_base_addr))
		return PTR_ERR(priv->fpga_base_addr);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	priv->fpga_data_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->fpga_data_addr))
		return PTR_ERR(priv->fpga_data_addr);

	priv->irq = platform_get_irq(pdev, 0);
	if (priv->irq < 0)
		return priv->irq;

	ret = devm_request_irq(dev, priv->irq, socfpga_fpga_isr, 0,
			       dev_name(dev), priv);
	if (ret)
		return ret;

	return fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
				 &socfpga_fpga_ops, priv);
}

static int socfpga_fpga_remove(struct platform_device *pdev)
{
	fpga_mgr_unregister(&pdev->dev);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id socfpga_fpga_of_match[] = {
	{ .compatible = "altr,socfpga-fpga-mgr", },
	{},
};

MODULE_DEVICE_TABLE(of, socfpga_fpga_of_match);
#endif

static struct platform_driver socfpga_fpga_driver = {
	.probe = socfpga_fpga_probe,
	.remove = socfpga_fpga_remove,
	.driver = {
		.name	= "socfpga_fpga_manager",
		.of_match_table = of_match_ptr(socfpga_fpga_of_match),
	},
};

module_platform_driver(socfpga_fpga_driver);

MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager");
MODULE_LICENSE("GPL v2");