Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 421 insertions, 0 deletions

diff --git a/drivers/mtd/nand/raw/txx9ndfmc.c b/drivers/mtd/nand/raw/txx9ndfmc.c
new file mode 100644
index 0000000000..eddcc0728a
--- /dev/null
+++ b/drivers/mtd/nand/raw/txx9ndfmc.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TXx9 NAND flash memory controller driver
+ * Based on RBTX49xx patch from CELF patch archive.
+ *
+ * (C) Copyright TOSHIBA CORPORATION 2004-2007
+ * All Rights Reserved.
+ */
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+#include <linux/platform_data/txx9/ndfmc.h>
+
+/* TXX9 NDFMC Registers */
+#define TXX9_NDFDTR	0x00
+#define TXX9_NDFMCR	0x04
+#define TXX9_NDFSR	0x08
+#define TXX9_NDFISR	0x0c
+#define TXX9_NDFIMR	0x10
+#define TXX9_NDFSPR	0x14
+#define TXX9_NDFRSTR	0x18	/* not TX4939 */
+
+/* NDFMCR : NDFMC Mode Control */
+#define TXX9_NDFMCR_WE	0x80
+#define TXX9_NDFMCR_ECC_ALL	0x60
+#define TXX9_NDFMCR_ECC_RESET	0x60
+#define TXX9_NDFMCR_ECC_READ	0x40
+#define TXX9_NDFMCR_ECC_ON	0x20
+#define TXX9_NDFMCR_ECC_OFF	0x00
+#define TXX9_NDFMCR_CE	0x10
+#define TXX9_NDFMCR_BSPRT	0x04	/* TX4925/TX4926 only */
+#define TXX9_NDFMCR_ALE	0x02
+#define TXX9_NDFMCR_CLE	0x01
+/* TX4939 only */
+#define TXX9_NDFMCR_X16	0x0400
+#define TXX9_NDFMCR_DMAREQ_MASK	0x0300
+#define TXX9_NDFMCR_DMAREQ_NODMA	0x0000
+#define TXX9_NDFMCR_DMAREQ_128	0x0100
+#define TXX9_NDFMCR_DMAREQ_256	0x0200
+#define TXX9_NDFMCR_DMAREQ_512	0x0300
+#define TXX9_NDFMCR_CS_MASK	0x0c
+#define TXX9_NDFMCR_CS(ch)	((ch) << 2)
+
+/* NDFMCR : NDFMC Status */
+#define TXX9_NDFSR_BUSY	0x80
+/* TX4939 only */
+#define TXX9_NDFSR_DMARUN	0x40
+
+/* NDFMCR : NDFMC Reset */
+#define TXX9_NDFRSTR_RST	0x01
+
+struct txx9ndfmc_priv {
+	struct platform_device *dev;
+	struct nand_chip chip;
+	int cs;
+	const char *mtdname;
+};
+
+#define MAX_TXX9NDFMC_DEV	4
+struct txx9ndfmc_drvdata {
+	struct mtd_info *mtds[MAX_TXX9NDFMC_DEV];
+	void __iomem *base;
+	unsigned char hold;	/* in gbusclock */
+	unsigned char spw;	/* in gbusclock */
+	struct nand_controller controller;
+};
+
+static struct platform_device *mtd_to_platdev(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
+	return txx9_priv->dev;
+}
+
+static void __iomem *ndregaddr(struct platform_device *dev, unsigned int reg)
+{
+	struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
+	struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
+
+	return drvdata->base + (reg << plat->shift);
+}
+
+static u32 txx9ndfmc_read(struct platform_device *dev, unsigned int reg)
+{
+	return __raw_readl(ndregaddr(dev, reg));
+}
+
+static void txx9ndfmc_write(struct platform_device *dev,
+			    u32 val, unsigned int reg)
+{
+	__raw_writel(val, ndregaddr(dev, reg));
+}
+
+static uint8_t txx9ndfmc_read_byte(struct nand_chip *chip)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+
+	return txx9ndfmc_read(dev, TXX9_NDFDTR);
+}
+
+static void txx9ndfmc_write_buf(struct nand_chip *chip, const uint8_t *buf,
+				int len)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+	void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
+	u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
+
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_WE, TXX9_NDFMCR);
+	while (len--)
+		__raw_writel(*buf++, ndfdtr);
+	txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
+}
+
+static void txx9ndfmc_read_buf(struct nand_chip *chip, uint8_t *buf, int len)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+	void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
+
+	while (len--)
+		*buf++ = __raw_readl(ndfdtr);
+}
+
+static void txx9ndfmc_cmd_ctrl(struct nand_chip *chip, int cmd,
+			       unsigned int ctrl)
+{
+	struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
+	struct platform_device *dev = txx9_priv->dev;
+	struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
+
+		mcr &= ~(TXX9_NDFMCR_CLE | TXX9_NDFMCR_ALE | TXX9_NDFMCR_CE);
+		mcr |= ctrl & NAND_CLE ? TXX9_NDFMCR_CLE : 0;
+		mcr |= ctrl & NAND_ALE ? TXX9_NDFMCR_ALE : 0;
+		/* TXX9_NDFMCR_CE bit is 0:high 1:low */
+		mcr |= ctrl & NAND_NCE ? TXX9_NDFMCR_CE : 0;
+		if (txx9_priv->cs >= 0 && (ctrl & NAND_NCE)) {
+			mcr &= ~TXX9_NDFMCR_CS_MASK;
+			mcr |= TXX9_NDFMCR_CS(txx9_priv->cs);
+		}
+		txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
+	}
+	if (cmd != NAND_CMD_NONE)
+		txx9ndfmc_write(dev, cmd & 0xff, TXX9_NDFDTR);
+	if (plat->flags & NDFMC_PLAT_FLAG_DUMMYWRITE) {
+		/* dummy write to update external latch */
+		if ((ctrl & NAND_CTRL_CHANGE) && cmd == NAND_CMD_NONE)
+			txx9ndfmc_write(dev, 0, TXX9_NDFDTR);
+	}
+}
+
+static int txx9ndfmc_dev_ready(struct nand_chip *chip)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+
+	return !(txx9ndfmc_read(dev, TXX9_NDFSR) & TXX9_NDFSR_BUSY);
+}
+
+static int txx9ndfmc_calculate_ecc(struct nand_chip *chip, const uint8_t *dat,
+				   uint8_t *ecc_code)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+	int eccbytes;
+	u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
+
+	mcr &= ~TXX9_NDFMCR_ECC_ALL;
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_READ, TXX9_NDFMCR);
+	for (eccbytes = chip->ecc.bytes; eccbytes > 0; eccbytes -= 3) {
+		ecc_code[1] = txx9ndfmc_read(dev, TXX9_NDFDTR);
+		ecc_code[0] = txx9ndfmc_read(dev, TXX9_NDFDTR);
+		ecc_code[2] = txx9ndfmc_read(dev, TXX9_NDFDTR);
+		ecc_code += 3;
+	}
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
+	return 0;
+}
+
+static int txx9ndfmc_correct_data(struct nand_chip *chip, unsigned char *buf,
+				  unsigned char *read_ecc,
+				  unsigned char *calc_ecc)
+{
+	int eccsize;
+	int corrected = 0;
+	int stat;
+
+	for (eccsize = chip->ecc.size; eccsize > 0; eccsize -= 256) {
+		stat = rawnand_sw_hamming_correct(chip, buf, read_ecc,
+						  calc_ecc);
+		if (stat < 0)
+			return stat;
+		corrected += stat;
+		buf += 256;
+		read_ecc += 3;
+		calc_ecc += 3;
+	}
+	return corrected;
+}
+
+static void txx9ndfmc_enable_hwecc(struct nand_chip *chip, int mode)
+{
+	struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
+	u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
+
+	mcr &= ~TXX9_NDFMCR_ECC_ALL;
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_RESET, TXX9_NDFMCR);
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
+	txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_ON, TXX9_NDFMCR);
+}
+
+static void txx9ndfmc_initialize(struct platform_device *dev)
+{
+	struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
+	struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
+	int tmout = 100;
+
+	if (plat->flags & NDFMC_PLAT_FLAG_NO_RSTR)
+		; /* no NDFRSTR.  Write to NDFSPR resets the NDFMC. */
+	else {
+		/* reset NDFMC */
+		txx9ndfmc_write(dev,
+				txx9ndfmc_read(dev, TXX9_NDFRSTR) |
+				TXX9_NDFRSTR_RST,
+				TXX9_NDFRSTR);
+		while (txx9ndfmc_read(dev, TXX9_NDFRSTR) & TXX9_NDFRSTR_RST) {
+			if (--tmout == 0) {
+				dev_err(&dev->dev, "reset failed.\n");
+				break;
+			}
+			udelay(1);
+		}
+	}
+	/* setup Hold Time, Strobe Pulse Width */
+	txx9ndfmc_write(dev, (drvdata->hold << 4) | drvdata->spw, TXX9_NDFSPR);
+	txx9ndfmc_write(dev,
+			(plat->flags & NDFMC_PLAT_FLAG_USE_BSPRT) ?
+			TXX9_NDFMCR_BSPRT : 0, TXX9_NDFMCR);
+}
+
+#define TXX9NDFMC_NS_TO_CYC(gbusclk, ns) \
+	DIV_ROUND_UP((ns) * DIV_ROUND_UP(gbusclk, 1000), 1000000)
+
+static int txx9ndfmc_attach_chip(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST)
+		return 0;
+
+	chip->ecc.strength = 1;
+
+	if (mtd->writesize >= 512) {
+		chip->ecc.size = 512;
+		chip->ecc.bytes = 6;
+	} else {
+		chip->ecc.size = 256;
+		chip->ecc.bytes = 3;
+	}
+
+	chip->ecc.calculate = txx9ndfmc_calculate_ecc;
+	chip->ecc.correct = txx9ndfmc_correct_data;
+	chip->ecc.hwctl = txx9ndfmc_enable_hwecc;
+
+	return 0;
+}
+
+static const struct nand_controller_ops txx9ndfmc_controller_ops = {
+	.attach_chip = txx9ndfmc_attach_chip,
+};
+
+static int __init txx9ndfmc_probe(struct platform_device *dev)
+{
+	struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
+	int hold, spw;
+	int i;
+	struct txx9ndfmc_drvdata *drvdata;
+	unsigned long gbusclk = plat->gbus_clock;
+
+	drvdata = devm_kzalloc(&dev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+	drvdata->base = devm_platform_ioremap_resource(dev, 0);
+	if (IS_ERR(drvdata->base))
+		return PTR_ERR(drvdata->base);
+
+	hold = plat->hold ?: 20; /* tDH */
+	spw = plat->spw ?: 90; /* max(tREADID, tWP, tRP) */
+
+	hold = TXX9NDFMC_NS_TO_CYC(gbusclk, hold);
+	spw = TXX9NDFMC_NS_TO_CYC(gbusclk, spw);
+	if (plat->flags & NDFMC_PLAT_FLAG_HOLDADD)
+		hold -= 2;	/* actual hold time : (HOLD + 2) BUSCLK */
+	spw -= 1;	/* actual wait time : (SPW + 1) BUSCLK */
+	hold = clamp(hold, 1, 15);
+	drvdata->hold = hold;
+	spw = clamp(spw, 1, 15);
+	drvdata->spw = spw;
+	dev_info(&dev->dev, "CLK:%ldMHz HOLD:%d SPW:%d\n",
+		 (gbusclk + 500000) / 1000000, hold, spw);
+
+	nand_controller_init(&drvdata->controller);
+	drvdata->controller.ops = &txx9ndfmc_controller_ops;
+
+	platform_set_drvdata(dev, drvdata);
+	txx9ndfmc_initialize(dev);
+
+	for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
+		struct txx9ndfmc_priv *txx9_priv;
+		struct nand_chip *chip;
+		struct mtd_info *mtd;
+
+		if (!(plat->ch_mask & (1 << i)))
+			continue;
+		txx9_priv = kzalloc(sizeof(struct txx9ndfmc_priv),
+				    GFP_KERNEL);
+		if (!txx9_priv)
+			continue;
+		chip = &txx9_priv->chip;
+		mtd = nand_to_mtd(chip);
+		mtd->dev.parent = &dev->dev;
+
+		chip->legacy.read_byte = txx9ndfmc_read_byte;
+		chip->legacy.read_buf = txx9ndfmc_read_buf;
+		chip->legacy.write_buf = txx9ndfmc_write_buf;
+		chip->legacy.cmd_ctrl = txx9ndfmc_cmd_ctrl;
+		chip->legacy.dev_ready = txx9ndfmc_dev_ready;
+		chip->legacy.chip_delay = 100;
+		chip->controller = &drvdata->controller;
+
+		nand_set_controller_data(chip, txx9_priv);
+		txx9_priv->dev = dev;
+
+		if (plat->ch_mask != 1) {
+			txx9_priv->cs = i;
+			txx9_priv->mtdname = kasprintf(GFP_KERNEL, "%s.%u",
+						       dev_name(&dev->dev), i);
+		} else {
+			txx9_priv->cs = -1;
+			txx9_priv->mtdname = kstrdup(dev_name(&dev->dev),
+						     GFP_KERNEL);
+		}
+		if (!txx9_priv->mtdname) {
+			kfree(txx9_priv);
+			dev_err(&dev->dev, "Unable to allocate MTD name.\n");
+			continue;
+		}
+		if (plat->wide_mask & (1 << i))
+			chip->options |= NAND_BUSWIDTH_16;
+
+		if (nand_scan(chip, 1)) {
+			kfree(txx9_priv->mtdname);
+			kfree(txx9_priv);
+			continue;
+		}
+		mtd->name = txx9_priv->mtdname;
+
+		mtd_device_register(mtd, NULL, 0);
+		drvdata->mtds[i] = mtd;
+	}
+
+	return 0;
+}
+
+static int __exit txx9ndfmc_remove(struct platform_device *dev)
+{
+	struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
+	int ret, i;
+
+	if (!drvdata)
+		return 0;
+	for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
+		struct mtd_info *mtd = drvdata->mtds[i];
+		struct nand_chip *chip;
+		struct txx9ndfmc_priv *txx9_priv;
+
+		if (!mtd)
+			continue;
+		chip = mtd_to_nand(mtd);
+		txx9_priv = nand_get_controller_data(chip);
+
+		ret = mtd_device_unregister(nand_to_mtd(chip));
+		WARN_ON(ret);
+		nand_cleanup(chip);
+		kfree(txx9_priv->mtdname);
+		kfree(txx9_priv);
+	}
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int txx9ndfmc_resume(struct platform_device *dev)
+{
+	if (platform_get_drvdata(dev))
+		txx9ndfmc_initialize(dev);
+	return 0;
+}
+#else
+#define txx9ndfmc_resume NULL
+#endif
+
+static struct platform_driver txx9ndfmc_driver = {
+	.remove		= __exit_p(txx9ndfmc_remove),
+	.resume		= txx9ndfmc_resume,
+	.driver		= {
+		.name	= "txx9ndfmc",
+	},
+};
+
+module_platform_driver_probe(txx9ndfmc_driver, txx9ndfmc_probe);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TXx9 SoC NAND flash controller driver");
+MODULE_ALIAS("platform:txx9ndfmc");