driver/memory:Move Freescale IFC driver to a common driver

 Freescale IFC controller has been used for mpc8xxx. It will be used
 for ARM-based SoC as well. This patch moves the driver to driver/memory
 and fix the header file includes.

  Also remove module_platform_driver() and  instead call
  platform_driver_register() from subsys_initcall() to make sure this module
  has been loaded before MTD partition parsing starts.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 309 insertions, 0 deletions

diff --git a/drivers/memory/fsl_ifc.c b/drivers/memory/fsl_ifc.c
new file mode 100644
index 000000000000..3d5d792d5cb2
--- /dev/null
+++ b/drivers/memory/fsl_ifc.c
@@ -0,0 +1,309 @@
+/*
+ * 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");