[mirror_ubuntu-artful-kernel.git] / drivers / memory / fsl_ifc.c

/*
 * Copyright 2011 Freescale Semiconductor, Inc
 *
 * Freescale Integrated Flash Controller
 *
 * Author: Dipen Dudhat <Dipen.Dudhat@freescale.com>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/fsl_ifc.h>
#include <asm/prom.h>

struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev;
EXPORT_SYMBOL(fsl_ifc_ctrl_dev);

/*
 * convert_ifc_address - convert the base address
 * @addr_base:	base address of the memory bank
 */
unsigned int convert_ifc_address(phys_addr_t addr_base)
{
	return addr_base & CSPR_BA;
}
EXPORT_SYMBOL(convert_ifc_address);

/*
 * fsl_ifc_find - find IFC bank
 * @addr_base:	base address of the memory bank
 *
 * This function walks IFC banks comparing "Base address" field of the CSPR
 * registers with the supplied addr_base argument. When bases match this
 * function returns bank number (starting with 0), otherwise it returns
 * appropriate errno value.
 */
int fsl_ifc_find(phys_addr_t addr_base)
{
	int i = 0;

	if (!fsl_ifc_ctrl_dev || !fsl_ifc_ctrl_dev->regs)
		return -ENODEV;

	for (i = 0; i < ARRAY_SIZE(fsl_ifc_ctrl_dev->regs->cspr_cs); i++) {
		u32 cspr = in_be32(&fsl_ifc_ctrl_dev->regs->cspr_cs[i].cspr);
		if (cspr & CSPR_V && (cspr & CSPR_BA) ==
				convert_ifc_address(addr_base))
			return i;
	}

	return -ENOENT;
}
EXPORT_SYMBOL(fsl_ifc_find);

static int fsl_ifc_ctrl_init(struct fsl_ifc_ctrl *ctrl)
{
	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;

	/*
	 * Clear all the common status and event registers
	 */
	if (in_be32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER)
		out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);

	/* enable all error and events */
	out_be32(&ifc->cm_evter_en, IFC_CM_EVTER_EN_CSEREN);

	/* enable all error and event interrupts */
	out_be32(&ifc->cm_evter_intr_en, IFC_CM_EVTER_INTR_EN_CSERIREN);
	out_be32(&ifc->cm_erattr0, 0x0);
	out_be32(&ifc->cm_erattr1, 0x0);

	return 0;
}

static int fsl_ifc_ctrl_remove(struct platform_device *dev)
{
	struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev);

	free_irq(ctrl->nand_irq, ctrl);
	free_irq(ctrl->irq, ctrl);

	irq_dispose_mapping(ctrl->nand_irq);
	irq_dispose_mapping(ctrl->irq);

	iounmap(ctrl->regs);

	dev_set_drvdata(&dev->dev, NULL);
	kfree(ctrl);

	return 0;
}

/*
 * NAND events are split between an operational interrupt which only
 * receives OPC, and an error interrupt that receives everything else,
 * including non-NAND errors.  Whichever interrupt gets to it first
 * records the status and wakes the wait queue.
 */
static DEFINE_SPINLOCK(nand_irq_lock);

static u32 check_nand_stat(struct fsl_ifc_ctrl *ctrl)
{
	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
	unsigned long flags;
	u32 stat;

	spin_lock_irqsave(&nand_irq_lock, flags);

	stat = in_be32(&ifc->ifc_nand.nand_evter_stat);
	if (stat) {
		out_be32(&ifc->ifc_nand.nand_evter_stat, stat);
		ctrl->nand_stat = stat;
		wake_up(&ctrl->nand_wait);
	}

	spin_unlock_irqrestore(&nand_irq_lock, flags);

	return stat;
}

static irqreturn_t fsl_ifc_nand_irq(int irqno, void *data)
{
	struct fsl_ifc_ctrl *ctrl = data;

	if (check_nand_stat(ctrl))
		return IRQ_HANDLED;

	return IRQ_NONE;
}

/*
 * NOTE: This interrupt is used to report ifc events of various kinds,
 * such as transaction errors on the chipselects.
 */
static irqreturn_t fsl_ifc_ctrl_irq(int irqno, void *data)
{
	struct fsl_ifc_ctrl *ctrl = data;
	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
	u32 err_axiid, err_srcid, status, cs_err, err_addr;
	irqreturn_t ret = IRQ_NONE;

	/* read for chip select error */
	cs_err = in_be32(&ifc->cm_evter_stat);
	if (cs_err) {
		dev_err(ctrl->dev, "transaction sent to IFC is not mapped to"
				"any memory bank 0x%08X\n", cs_err);
		/* clear the chip select error */
		out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);

		/* read error attribute registers print the error information */
		status = in_be32(&ifc->cm_erattr0);
		err_addr = in_be32(&ifc->cm_erattr1);

		if (status & IFC_CM_ERATTR0_ERTYP_READ)
			dev_err(ctrl->dev, "Read transaction error"
				"CM_ERATTR0 0x%08X\n", status);
		else
			dev_err(ctrl->dev, "Write transaction error"
				"CM_ERATTR0 0x%08X\n", status);

		err_axiid = (status & IFC_CM_ERATTR0_ERAID) >>
					IFC_CM_ERATTR0_ERAID_SHIFT;
		dev_err(ctrl->dev, "AXI ID of the error"
					"transaction 0x%08X\n", err_axiid);

		err_srcid = (status & IFC_CM_ERATTR0_ESRCID) >>
					IFC_CM_ERATTR0_ESRCID_SHIFT;
		dev_err(ctrl->dev, "SRC ID of the error"
					"transaction 0x%08X\n", err_srcid);

		dev_err(ctrl->dev, "Transaction Address corresponding to error"
					"ERADDR 0x%08X\n", err_addr);

		ret = IRQ_HANDLED;
	}

	if (check_nand_stat(ctrl))
		ret = IRQ_HANDLED;

	return ret;
}

/*
 * fsl_ifc_ctrl_probe
 *
 * called by device layer when it finds a device matching
 * one our driver can handled. This code allocates all of
 * the resources needed for the controller only.  The
 * resources for the NAND banks themselves are allocated
 * in the chip probe function.
*/
static int fsl_ifc_ctrl_probe(struct platform_device *dev)
{
	int ret = 0;


	dev_info(&dev->dev, "Freescale Integrated Flash Controller\n");

	fsl_ifc_ctrl_dev = kzalloc(sizeof(*fsl_ifc_ctrl_dev), GFP_KERNEL);
	if (!fsl_ifc_ctrl_dev)
		return -ENOMEM;

	dev_set_drvdata(&dev->dev, fsl_ifc_ctrl_dev);

	/* IOMAP the entire IFC region */
	fsl_ifc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
	if (!fsl_ifc_ctrl_dev->regs) {
		dev_err(&dev->dev, "failed to get memory region\n");
		ret = -ENODEV;
		goto err;
	}

	/* get the Controller level irq */
	fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
	if (fsl_ifc_ctrl_dev->irq == NO_IRQ) {
		dev_err(&dev->dev, "failed to get irq resource "
							"for IFC\n");
		ret = -ENODEV;
		goto err;
	}

	/* get the nand machine irq */
	fsl_ifc_ctrl_dev->nand_irq =
			irq_of_parse_and_map(dev->dev.of_node, 1);

	fsl_ifc_ctrl_dev->dev = &dev->dev;

	ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
	if (ret < 0)
		goto err;

	init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);

	ret = request_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_irq, IRQF_SHARED,
			  "fsl-ifc", fsl_ifc_ctrl_dev);
	if (ret != 0) {
		dev_err(&dev->dev, "failed to install irq (%d)\n",
			fsl_ifc_ctrl_dev->irq);
		goto err_irq;
	}

	if (fsl_ifc_ctrl_dev->nand_irq) {
		ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq,
				0, "fsl-ifc-nand", fsl_ifc_ctrl_dev);
		if (ret != 0) {
			dev_err(&dev->dev, "failed to install irq (%d)\n",
				fsl_ifc_ctrl_dev->nand_irq);
			goto err_nandirq;
		}
	}

	return 0;

err_nandirq:
	free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
err_irq:
	free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
	irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
err:
	return ret;
}

static const struct of_device_id fsl_ifc_match[] = {
	{
		.compatible = "fsl,ifc",
	},
	{},
};

static struct platform_driver fsl_ifc_ctrl_driver = {
	.driver = {
		.name	= "fsl-ifc",
		.of_match_table = fsl_ifc_match,
	},
	.probe       = fsl_ifc_ctrl_probe,
	.remove      = fsl_ifc_ctrl_remove,
};

static int __init fsl_ifc_init(void)
{
	return platform_driver_register(&fsl_ifc_ctrl_driver);
}
subsys_initcall(fsl_ifc_init);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Freescale Semiconductor");
MODULE_DESCRIPTION("Freescale Integrated Flash Controller driver");
Commit	Line	Data
a20cbdef PK	1	/*
	2	* Copyright 2011 Freescale Semiconductor, Inc
	3	*
	4	* Freescale Integrated Flash Controller
	5	*
	6	* Author: Dipen Dudhat <Dipen.Dudhat@freescale.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
a20cbdef PK	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/compiler.h>
	25	#include <linux/spinlock.h>
	26	#include <linux/types.h>
	27	#include <linux/slab.h>
	28	#include <linux/io.h>
	29	#include <linux/of.h>
	30	#include <linux/of_device.h>
	31	#include <linux/platform_device.h>
d2ae2e20	32	#include <linux/fsl_ifc.h>
a20cbdef	33	#include <asm/prom.h>
a20cbdef PK	34
	35	struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev;
	36	EXPORT_SYMBOL(fsl_ifc_ctrl_dev);
	37
	38	/*
	39	* convert_ifc_address - convert the base address
	40	* @addr_base: base address of the memory bank
	41	*/
	42	unsigned int convert_ifc_address(phys_addr_t addr_base)
	43	{
	44	return addr_base & CSPR_BA;
	45	}
	46	EXPORT_SYMBOL(convert_ifc_address);
	47
	48	/*
	49	* fsl_ifc_find - find IFC bank
	50	* @addr_base: base address of the memory bank
	51	*
	52	* This function walks IFC banks comparing "Base address" field of the CSPR
	53	* registers with the supplied addr_base argument. When bases match this
	54	* function returns bank number (starting with 0), otherwise it returns
	55	* appropriate errno value.
	56	*/
	57	int fsl_ifc_find(phys_addr_t addr_base)
	58	{
	59	int i = 0;
	60
	61	if (!fsl_ifc_ctrl_dev \|\| !fsl_ifc_ctrl_dev->regs)
	62	return -ENODEV;
	63
	64	for (i = 0; i < ARRAY_SIZE(fsl_ifc_ctrl_dev->regs->cspr_cs); i++) {
8998a030	65	u32 cspr = in_be32(&fsl_ifc_ctrl_dev->regs->cspr_cs[i].cspr);
a20cbdef PK	66	if (cspr & CSPR_V && (cspr & CSPR_BA) ==
	67	convert_ifc_address(addr_base))
	68	return i;
	69	}
	70
	71	return -ENOENT;
	72	}
	73	EXPORT_SYMBOL(fsl_ifc_find);
	74
cad5cef6	75	static int fsl_ifc_ctrl_init(struct fsl_ifc_ctrl *ctrl)
a20cbdef PK	76	{
	77	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
	78
	79	/*
	80	* Clear all the common status and event registers
	81	*/
	82	if (in_be32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER)
	83	out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);
	84
	85	/* enable all error and events */
	86	out_be32(&ifc->cm_evter_en, IFC_CM_EVTER_EN_CSEREN);
	87
	88	/* enable all error and event interrupts */
	89	out_be32(&ifc->cm_evter_intr_en, IFC_CM_EVTER_INTR_EN_CSERIREN);
	90	out_be32(&ifc->cm_erattr0, 0x0);
	91	out_be32(&ifc->cm_erattr1, 0x0);
	92
	93	return 0;
	94	}
	95
	96	static int fsl_ifc_ctrl_remove(struct platform_device *dev)
	97	{
	98	struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev);
	99
	100	free_irq(ctrl->nand_irq, ctrl);
	101	free_irq(ctrl->irq, ctrl);
	102
	103	irq_dispose_mapping(ctrl->nand_irq);
	104	irq_dispose_mapping(ctrl->irq);
	105
	106	iounmap(ctrl->regs);
	107
	108	dev_set_drvdata(&dev->dev, NULL);
	109	kfree(ctrl);
	110
	111	return 0;
	112	}
	113
	114	/*
	115	* NAND events are split between an operational interrupt which only
	116	* receives OPC, and an error interrupt that receives everything else,
	117	* including non-NAND errors. Whichever interrupt gets to it first
	118	* records the status and wakes the wait queue.
	119	*/
	120	static DEFINE_SPINLOCK(nand_irq_lock);
	121
	122	static u32 check_nand_stat(struct fsl_ifc_ctrl *ctrl)
	123	{
	124	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
	125	unsigned long flags;
	126	u32 stat;
	127
	128	spin_lock_irqsave(&nand_irq_lock, flags);
	129
	130	stat = in_be32(&ifc->ifc_nand.nand_evter_stat);
	131	if (stat) {
	132	out_be32(&ifc->ifc_nand.nand_evter_stat, stat);
	133	ctrl->nand_stat = stat;
	134	wake_up(&ctrl->nand_wait);
	135	}
	136
	137	spin_unlock_irqrestore(&nand_irq_lock, flags);
	138
	139	return stat;
140	}
141
142	static irqreturn_t fsl_ifc_nand_irq(int irqno, void *data)
143	{
144	struct fsl_ifc_ctrl *ctrl = data;
145
146	if (check_nand_stat(ctrl))
147	return IRQ_HANDLED;
148
149	return IRQ_NONE;
150	}
151
152	/*
153	* NOTE: This interrupt is used to report ifc events of various kinds,
154	* such as transaction errors on the chipselects.
155	*/
156	static irqreturn_t fsl_ifc_ctrl_irq(int irqno, void *data)
157	{
158	struct fsl_ifc_ctrl *ctrl = data;
159	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
160	u32 err_axiid, err_srcid, status, cs_err, err_addr;
161	irqreturn_t ret = IRQ_NONE;
162
163	/* read for chip select error */
164	cs_err = in_be32(&ifc->cm_evter_stat);
165	if (cs_err) {
166	dev_err(ctrl->dev, "transaction sent to IFC is not mapped to"
167	"any memory bank 0x%08X\n", cs_err);
168	/* clear the chip select error */
169	out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);
170
171	/* read error attribute registers print the error information */
172	status = in_be32(&ifc->cm_erattr0);
173	err_addr = in_be32(&ifc->cm_erattr1);
174
175	if (status & IFC_CM_ERATTR0_ERTYP_READ)
176	dev_err(ctrl->dev, "Read transaction error"
177	"CM_ERATTR0 0x%08X\n", status);
178	else
179	dev_err(ctrl->dev, "Write transaction error"
180	"CM_ERATTR0 0x%08X\n", status);
181
182	err_axiid = (status & IFC_CM_ERATTR0_ERAID) >>
183	IFC_CM_ERATTR0_ERAID_SHIFT;
184	dev_err(ctrl->dev, "AXI ID of the error"
185	"transaction 0x%08X\n", err_axiid);
186
187	err_srcid = (status & IFC_CM_ERATTR0_ESRCID) >>
188	IFC_CM_ERATTR0_ESRCID_SHIFT;
189	dev_err(ctrl->dev, "SRC ID of the error"
190	"transaction 0x%08X\n", err_srcid);
191
192	dev_err(ctrl->dev, "Transaction Address corresponding to error"
193	"ERADDR 0x%08X\n", err_addr);
194
195	ret = IRQ_HANDLED;
196	}
197
198	if (check_nand_stat(ctrl))
199	ret = IRQ_HANDLED;
200
201	return ret;
202	}
203
204	/*
205	* fsl_ifc_ctrl_probe
206	*
207	* called by device layer when it finds a device matching
208	* one our driver can handled. This code allocates all of
209	* the resources needed for the controller only. The
210	* resources for the NAND banks themselves are allocated
211	* in the chip probe function.
212	*/
cad5cef6	213	static int fsl_ifc_ctrl_probe(struct platform_device *dev)
a20cbdef PK	214	{
	215	int ret = 0;
	216
	217
	218	dev_info(&dev->dev, "Freescale Integrated Flash Controller\n");
	219
	220	fsl_ifc_ctrl_dev = kzalloc(sizeof(*fsl_ifc_ctrl_dev), GFP_KERNEL);
	221	if (!fsl_ifc_ctrl_dev)
	222	return -ENOMEM;
	223
	224	dev_set_drvdata(&dev->dev, fsl_ifc_ctrl_dev);
	225
	226	/* IOMAP the entire IFC region */
	227	fsl_ifc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
	228	if (!fsl_ifc_ctrl_dev->regs) {
	229	dev_err(&dev->dev, "failed to get memory region\n");
	230	ret = -ENODEV;
	231	goto err;
	232	}
	233
	234	/* get the Controller level irq */
	235	fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
	236	if (fsl_ifc_ctrl_dev->irq == NO_IRQ) {
	237	dev_err(&dev->dev, "failed to get irq resource "
	238	"for IFC\n");
	239	ret = -ENODEV;
	240	goto err;
	241	}
	242
	243	/* get the nand machine irq */
	244	fsl_ifc_ctrl_dev->nand_irq =
	245	irq_of_parse_and_map(dev->dev.of_node, 1);
a20cbdef PK	246
	247	fsl_ifc_ctrl_dev->dev = &dev->dev;
	248
	249	ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
	250	if (ret < 0)
	251	goto err;
	252
	253	init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
	254
	255	ret = request_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_irq, IRQF_SHARED,
	256	"fsl-ifc", fsl_ifc_ctrl_dev);
	257	if (ret != 0) {
	258	dev_err(&dev->dev, "failed to install irq (%d)\n",
	259	fsl_ifc_ctrl_dev->irq);
	260	goto err_irq;
	261	}
	262
721c0705 PK	263	if (fsl_ifc_ctrl_dev->nand_irq) {
	264	ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq,
	265	0, "fsl-ifc-nand", fsl_ifc_ctrl_dev);
	266	if (ret != 0) {
	267	dev_err(&dev->dev, "failed to install irq (%d)\n",
	268	fsl_ifc_ctrl_dev->nand_irq);
	269	goto err_nandirq;
	270	}
a20cbdef PK	271	}
	272
	273	return 0;
	274
	275	err_nandirq:
	276	free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
	277	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
	278	err_irq:
	279	free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
	280	irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
	281	err:
	282	return ret;
	283	}
	284
	285	static const struct of_device_id fsl_ifc_match[] = {
	286	{
	287	.compatible = "fsl,ifc",
	288	},
	289	{},
	290	};
	291
	292	static struct platform_driver fsl_ifc_ctrl_driver = {
	293	.driver = {
	294	.name = "fsl-ifc",
	295	.of_match_table = fsl_ifc_match,
	296	},
	297	.probe = fsl_ifc_ctrl_probe,
	298	.remove = fsl_ifc_ctrl_remove,
	299	};
	300
d2ae2e20 PK	301	static int __init fsl_ifc_init(void)
	302	{
	303	return platform_driver_register(&fsl_ifc_ctrl_driver);
	304	}
	305	subsys_initcall(fsl_ifc_init);
a20cbdef PK	306
	307	MODULE_LICENSE("GPL");
	308	MODULE_AUTHOR("Freescale Semiconductor");
	309	MODULE_DESCRIPTION("Freescale Integrated Flash Controller driver");