/*
* 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/sched.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 < fsl_ifc_ctrl_dev->banks; i++) {
u32 cspr = ifc_in32(&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 (ifc_in32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER)
ifc_out32(IFC_CM_EVTER_STAT_CSER, &ifc->cm_evter_stat);
/* enable all error and events */
ifc_out32(IFC_CM_EVTER_EN_CSEREN, &ifc->cm_evter_en);
/* enable all error and event interrupts */
ifc_out32(IFC_CM_EVTER_INTR_EN_CSERIREN, &ifc->cm_evter_intr_en);
ifc_out32(0x0, &ifc->cm_erattr0);
ifc_out32(0x0, &ifc->cm_erattr1);
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 = ifc_in32(&ifc->ifc_nand.nand_evter_stat);
if (stat) {
ifc_out32(stat, &ifc->ifc_nand.nand_evter_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 = ifc_in32(&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 */
ifc_out32(IFC_CM_EVTER_STAT_CSER, &ifc->cm_evter_stat);
/* read error attribute registers print the error information */
status = ifc_in32(&ifc->cm_erattr0);
err_addr = ifc_in32(&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;
int version, banks;
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;
}
version = ifc_in32(&fsl_ifc_ctrl_dev->regs->ifc_rev) &
FSL_IFC_VERSION_MASK;
banks = (version == FSL_IFC_VERSION_1_0_0) ? 4 : 8;
dev_info(&dev->dev, "IFC version %d.%d, %d banks\n",
version >> 24, (version >> 16) & 0xf, banks);
fsl_ifc_ctrl_dev->version = version;
fsl_ifc_ctrl_dev->banks = banks;
if (of_property_read_bool(dev->dev.of_node, "little-endian")) {
fsl_ifc_ctrl_dev->little_endian = true;
dev_dbg(&dev->dev, "IFC REGISTERS are LITTLE endian\n");
} else {
fsl_ifc_ctrl_dev->little_endian = false;
dev_dbg(&dev->dev, "IFC REGISTERS are BIG endian\n");
}
version = ioread32be(&fsl_ifc_ctrl_dev->regs->ifc_rev) &
FSL_IFC_VERSION_MASK;
banks = (version == FSL_IFC_VERSION_1_0_0) ? 4 : 8;
dev_info(&dev->dev, "IFC version %d.%d, %d banks\n",
version >> 24, (version >> 16) & 0xf, banks);
fsl_ifc_ctrl_dev->version = version;
fsl_ifc_ctrl_dev->banks = banks;
/* 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");
