1 files changed, 273 insertions, 37 deletions

diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index dceb8d1a843..d631022ffb4 100644
--- a/arch/powerpc/sysdev/fsl_lbc.c
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -1,9 +1,12 @@
 /*
  * Freescale LBC and UPM routines.
  *
- * Copyright (c) 2007-2008  MontaVista Software, Inc.
+ * Copyright © 2007-2008  MontaVista Software, Inc.
+ * Copyright © 2010 Freescale Semiconductor
  *
  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ * Author: Jack Lan <Jack.Lan@freescale.com>
+ * Author: Roy Zang <tie-fei.zang@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
@@ -12,46 +15,45 @@
  */
 
 #include <linux/init.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/compiler.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/mod_devicetable.h>
 #include <asm/prom.h>
 #include <asm/fsl_lbc.h>
 
 static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock);
-static struct fsl_lbc_regs __iomem *fsl_lbc_regs;
+struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
+EXPORT_SYMBOL(fsl_lbc_ctrl_dev);
 
-static char __initdata *compat_lbc[] = {
-	"fsl,pq2-localbus",
-	"fsl,pq2pro-localbus",
-	"fsl,pq3-localbus",
-	"fsl,elbc",
-};
-
-static int __init fsl_lbc_init(void)
+/**
+ * fsl_lbc_addr - convert the base address
+ * @addr_base:	base address of the memory bank
+ *
+ * This function converts a base address of lbc into the right format for the
+ * BR register. If the SOC has eLBC then it returns 32bit physical address
+ * else it convers a 34bit local bus physical address to correct format of
+ * 32bit address for BR register (Example: MPC8641).
+ */
+u32 fsl_lbc_addr(phys_addr_t addr_base)
 {
-	struct device_node *lbus;
-	int i;
+	struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node;
+	u32 addr = addr_base & 0xffff8000;
 
-	for (i = 0; i < ARRAY_SIZE(compat_lbc); i++) {
-		lbus = of_find_compatible_node(NULL, NULL, compat_lbc[i]);
-		if (lbus)
-			goto found;
-	}
-	return -ENODEV;
+	if (of_device_is_compatible(np, "fsl,elbc"))
+		return addr;
 
-found:
-	fsl_lbc_regs = of_iomap(lbus, 0);
-	of_node_put(lbus);
-	if (!fsl_lbc_regs)
-		return -ENOMEM;
-	return 0;
+	return addr | ((addr_base & 0x300000000ull) >> 19);
 }
-arch_initcall(fsl_lbc_init);
+EXPORT_SYMBOL(fsl_lbc_addr);
 
 /**
  * fsl_lbc_find - find Localbus bank
@@ -65,15 +67,17 @@ arch_initcall(fsl_lbc_init);
 int fsl_lbc_find(phys_addr_t addr_base)
 {
 	int i;
+	struct fsl_lbc_regs __iomem *lbc;
 
-	if (!fsl_lbc_regs)
+	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 		return -ENODEV;
 
-	for (i = 0; i < ARRAY_SIZE(fsl_lbc_regs->bank); i++) {
-		__be32 br = in_be32(&fsl_lbc_regs->bank[i].br);
-		__be32 or = in_be32(&fsl_lbc_regs->bank[i].or);
+	lbc = fsl_lbc_ctrl_dev->regs;
+	for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) {
+		u32 br = in_be32(&lbc->bank[i].br);
+		u32 or = in_be32(&lbc->bank[i].or);
 
-		if (br & BR_V && (br & or & BR_BA) == addr_base)
+		if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base))
 			return i;
 	}
 
@@ -93,23 +97,28 @@ EXPORT_SYMBOL(fsl_lbc_find);
 int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm)
 {
 	int bank;
-	__be32 br;
+	u32 br;
+	struct fsl_lbc_regs __iomem *lbc;
 
 	bank = fsl_lbc_find(addr_base);
 	if (bank < 0)
 		return bank;
 
-	br = in_be32(&fsl_lbc_regs->bank[bank].br);
+	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
+		return -ENODEV;
+
+	lbc = fsl_lbc_ctrl_dev->regs;
+	br = in_be32(&lbc->bank[bank].br);
 
 	switch (br & BR_MSEL) {
 	case BR_MS_UPMA:
-		upm->mxmr = &fsl_lbc_regs->mamr;
+		upm->mxmr = &lbc->mamr;
 		break;
 	case BR_MS_UPMB:
-		upm->mxmr = &fsl_lbc_regs->mbmr;
+		upm->mxmr = &lbc->mbmr;
 		break;
 	case BR_MS_UPMC:
-		upm->mxmr = &fsl_lbc_regs->mcmr;
+		upm->mxmr = &lbc->mcmr;
 		break;
 	default:
 		return -EINVAL;
@@ -148,9 +157,12 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
 	int ret = 0;
 	unsigned long flags;
 
+	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
+		return -ENODEV;
+
 	spin_lock_irqsave(&fsl_lbc_lock, flags);
 
-	out_be32(&fsl_lbc_regs->mar, mar);
+	out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar);
 
 	switch (upm->width) {
 	case 8:
@@ -172,3 +184,227 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
 	return ret;
 }
 EXPORT_SYMBOL(fsl_upm_run_pattern);
+
+static int fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
+			     struct device_node *node)
+{
+	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+
+	/* clear event registers */
+	setbits32(&lbc->ltesr, LTESR_CLEAR);
+	out_be32(&lbc->lteatr, 0);
+	out_be32(&lbc->ltear, 0);
+	out_be32(&lbc->lteccr, LTECCR_CLEAR);
+	out_be32(&lbc->ltedr, LTEDR_ENABLE);
+
+	/* Set the monitor timeout value to the maximum for erratum A001 */
+	if (of_device_is_compatible(node, "fsl,elbc"))
+		clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);
+
+	return 0;
+}
+
+/*
+ * NOTE: This interrupt is used to report localbus events of various kinds,
+ * such as transaction errors on the chipselects.
+ */
+
+static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data)
+{
+	struct fsl_lbc_ctrl *ctrl = data;
+	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+	u32 status;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_lbc_lock, flags);
+	status = in_be32(&lbc->ltesr);
+	if (!status) {
+		spin_unlock_irqrestore(&fsl_lbc_lock, flags);
+		return IRQ_NONE;
+	}
+
+	out_be32(&lbc->ltesr, LTESR_CLEAR);
+	out_be32(&lbc->lteatr, 0);
+	out_be32(&lbc->ltear, 0);
+	ctrl->irq_status = status;
+
+	if (status & LTESR_BM)
+		dev_err(ctrl->dev, "Local bus monitor time-out: "
+			"LTESR 0x%08X\n", status);
+	if (status & LTESR_WP)
+		dev_err(ctrl->dev, "Write protect error: "
+			"LTESR 0x%08X\n", status);
+	if (status & LTESR_ATMW)
+		dev_err(ctrl->dev, "Atomic write error: "
+			"LTESR 0x%08X\n", status);
+	if (status & LTESR_ATMR)
+		dev_err(ctrl->dev, "Atomic read error: "
+			"LTESR 0x%08X\n", status);
+	if (status & LTESR_CS)
+		dev_err(ctrl->dev, "Chip select error: "
+			"LTESR 0x%08X\n", status);
+	if (status & LTESR_UPM)
+		;
+	if (status & LTESR_FCT) {
+		dev_err(ctrl->dev, "FCM command time-out: "
+			"LTESR 0x%08X\n", status);
+		smp_wmb();
+		wake_up(&ctrl->irq_wait);
+	}
+	if (status & LTESR_PAR) {
+		dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: "
+			"LTESR 0x%08X\n", status);
+		smp_wmb();
+		wake_up(&ctrl->irq_wait);
+	}
+	if (status & LTESR_CC) {
+		smp_wmb();
+		wake_up(&ctrl->irq_wait);
+	}
+	if (status & ~LTESR_MASK)
+		dev_err(ctrl->dev, "Unknown error: "
+			"LTESR 0x%08X\n", status);
+	spin_unlock_irqrestore(&fsl_lbc_lock, flags);
+	return IRQ_HANDLED;
+}
+
+/*
+ * fsl_lbc_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_lbc_ctrl_probe(struct platform_device *dev)
+{
+	int ret;
+
+	if (!dev->dev.of_node) {
+		dev_err(&dev->dev, "Device OF-Node is NULL");
+		return -EFAULT;
+	}
+
+	fsl_lbc_ctrl_dev = kzalloc(sizeof(*fsl_lbc_ctrl_dev), GFP_KERNEL);
+	if (!fsl_lbc_ctrl_dev)
+		return -ENOMEM;
+
+	dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev);
+
+	spin_lock_init(&fsl_lbc_ctrl_dev->lock);
+	init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait);
+
+	fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
+	if (!fsl_lbc_ctrl_dev->regs) {
+		dev_err(&dev->dev, "failed to get memory region\n");
+		ret = -ENODEV;
+		goto err;
+	}
+
+	fsl_lbc_ctrl_dev->irq[0] = irq_of_parse_and_map(dev->dev.of_node, 0);
+	if (!fsl_lbc_ctrl_dev->irq[0]) {
+		dev_err(&dev->dev, "failed to get irq resource\n");
+		ret = -ENODEV;
+		goto err;
+	}
+
+	fsl_lbc_ctrl_dev->dev = &dev->dev;
+
+	ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
+	if (ret < 0)
+		goto err;
+
+	ret = request_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_irq, 0,
+				"fsl-lbc", fsl_lbc_ctrl_dev);
+	if (ret != 0) {
+		dev_err(&dev->dev, "failed to install irq (%d)\n",
+			fsl_lbc_ctrl_dev->irq[0]);
+		ret = fsl_lbc_ctrl_dev->irq[0];
+		goto err;
+	}
+
+	fsl_lbc_ctrl_dev->irq[1] = irq_of_parse_and_map(dev->dev.of_node, 1);
+	if (fsl_lbc_ctrl_dev->irq[1]) {
+		ret = request_irq(fsl_lbc_ctrl_dev->irq[1], fsl_lbc_ctrl_irq,
+				IRQF_SHARED, "fsl-lbc-err", fsl_lbc_ctrl_dev);
+		if (ret) {
+			dev_err(&dev->dev, "failed to install irq (%d)\n",
+					fsl_lbc_ctrl_dev->irq[1]);
+			ret = fsl_lbc_ctrl_dev->irq[1];
+			goto err1;
+		}
+	}
+
+	/* Enable interrupts for any detected events */
+	out_be32(&fsl_lbc_ctrl_dev->regs->lteir, LTEIR_ENABLE);
+
+	return 0;
+
+err1:
+	free_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_dev);
+err:
+	iounmap(fsl_lbc_ctrl_dev->regs);
+	kfree(fsl_lbc_ctrl_dev);
+	fsl_lbc_ctrl_dev = NULL;
+	return ret;
+}
+
+#ifdef CONFIG_SUSPEND
+
+/* save lbc registers */
+static int fsl_lbc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
+	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+
+	ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
+	if (!ctrl->saved_regs)
+		return -ENOMEM;
+
+	_memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));
+	return 0;
+}
+
+/* restore lbc registers */
+static int fsl_lbc_resume(struct platform_device *pdev)
+{
+	struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
+	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+
+	if (ctrl->saved_regs) {
+		_memcpy_toio(lbc, ctrl->saved_regs,
+				sizeof(struct fsl_lbc_regs));
+		kfree(ctrl->saved_regs);
+		ctrl->saved_regs = NULL;
+	}
+	return 0;
+}
+#endif /* CONFIG_SUSPEND */
+
+static const struct of_device_id fsl_lbc_match[] = {
+	{ .compatible = "fsl,elbc", },
+	{ .compatible = "fsl,pq3-localbus", },
+	{ .compatible = "fsl,pq2-localbus", },
+	{ .compatible = "fsl,pq2pro-localbus", },
+	{},
+};
+
+static struct platform_driver fsl_lbc_ctrl_driver = {
+	.driver = {
+		.name = "fsl-lbc",
+		.of_match_table = fsl_lbc_match,
+	},
+	.probe = fsl_lbc_ctrl_probe,
+#ifdef CONFIG_SUSPEND
+	.suspend     = fsl_lbc_suspend,
+	.resume      = fsl_lbc_resume,
+#endif
+};
+
+static int __init fsl_lbc_init(void)
+{
+	return platform_driver_register(&fsl_lbc_ctrl_driver);
+}
+module_init(fsl_lbc_init);