nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/sunxi_nfc.c b/drivers/mtd/nand/sunxi_nfc.c
new file mode 100644
index 0000000..1c7a511
--- /dev/null
+++ b/drivers/mtd/nand/sunxi_nfc.c
@@ -0,0 +1,700 @@
+/*
+ * Copyright (C) 2013 Boris BREZILLON <b.brezillon@xxxxxxxxxxx>
+ *
+ * Derived from Qiang Yu work:
+ * https://github.com/yuq/sunxi-nfc-mtd
+ * Copyright (C) 2013 Qiang Yu <yuq825@xxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_mtd.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#define NFC_REG_CTL 0x0000
+#define NFC_REG_ST 0x0004
+#define NFC_REG_INT 0x0008
+#define NFC_REG_TIMING_CTL 0x000C
+#define NFC_REG_TIMING_CFG 0x0010
+#define NFC_REG_ADDR_LOW 0x0014
+#define NFC_REG_ADDR_HIGH 0x0018
+#define NFC_REG_SECTOR_NUM 0x001C
+#define NFC_REG_CNT 0x0020
+#define NFC_REG_CMD 0x0024
+#define NFC_REG_RCMD_SET 0x0028
+#define NFC_REG_WCMD_SET 0x002C
+#define NFC_REG_IO_DATA 0x0030
+#define NFC_REG_ECC_CTL 0x0034
+#define NFC_REG_ECC_ST 0x0038
+#define NFC_REG_DEBUG 0x003C
+#define NFC_REG_ECC_CNT0 0x0040
+#define NFC_REG_ECC_CNT1 0x0044
+#define NFC_REG_ECC_CNT2 0x0048
+#define NFC_REG_ECC_CNT3 0x004c
+#define NFC_REG_USER_DATA_BASE 0x0050
+#define NFC_REG_SPARE_AREA 0x00A0
+#define NFC_RAM0_BASE 0x0400
+#define NFC_RAM1_BASE 0x0800
+
+/*define bit use in NFC_CTL*/
+#define NFC_EN (1 << 0)
+#define NFC_RESET (1 << 1)
+#define NFC_BUS_WIDYH (1 << 2)
+#define NFC_RB_SEL (1 << 3)
+#define NFC_CE_SEL (7 << 24)
+#define NFC_CE_CTL (1 << 6)
+#define NFC_CE_CTL1 (1 << 7)
+#define NFC_PAGE_SIZE (0xf << 8)
+#define NFC_SAM (1 << 12)
+#define NFC_RAM_METHOD (1 << 14)
+#define NFC_DEBUG_CTL (1 << 31)
+
+/*define bit use in NFC_ST*/
+#define NFC_RB_B2R (1 << 0)
+#define NFC_CMD_INT_FLAG (1 << 1)
+#define NFC_DMA_INT_FLAG (1 << 2)
+#define NFC_CMD_FIFO_STATUS (1 << 3)
+#define NFC_STA (1 << 4)
+#define NFC_NATCH_INT_FLAG (1 << 5)
+#define NFC_RB_STATE0 (1 << 8)
+#define NFC_RB_STATE1 (1 << 9)
+#define NFC_RB_STATE2 (1 << 10)
+#define NFC_RB_STATE3 (1 << 11)
+
+/*define bit use in NFC_INT*/
+#define NFC_B2R_INT_ENABLE (1 << 0)
+#define NFC_CMD_INT_ENABLE (1 << 1)
+#define NFC_DMA_INT_ENABLE (1 << 2)
+#define NFC_INT_MASK (NFC_B2R_INT_ENABLE | \
+ NFC_CMD_INT_ENABLE | \
+ NFC_DMA_INT_ENABLE)
+
+
+/*define bit use in NFC_CMD*/
+#define NFC_CMD_LOW_BYTE (0xff << 0)
+#define NFC_CMD_HIGH_BYTE (0xff << 8)
+#define NFC_ADR_NUM (0x7 << 16)
+#define NFC_SEND_ADR (1 << 19)
+#define NFC_ACCESS_DIR (1 << 20)
+#define NFC_DATA_TRANS (1 << 21)
+#define NFC_SEND_CMD1 (1 << 22)
+#define NFC_WAIT_FLAG (1 << 23)
+#define NFC_SEND_CMD2 (1 << 24)
+#define NFC_SEQ (1 << 25)
+#define NFC_DATA_SWAP_METHOD (1 << 26)
+#define NFC_ROW_AUTO_INC (1 << 27)
+#define NFC_SEND_CMD3 (1 << 28)
+#define NFC_SEND_CMD4 (1 << 29)
+#define NFC_CMD_TYPE (3 << 30)
+
+/* define bit use in NFC_RCMD_SET*/
+#define NFC_READ_CMD (0xff << 0)
+#define NFC_RANDOM_READ_CMD0 (0xff << 8)
+#define NFC_RANDOM_READ_CMD1 (0xff << 16)
+
+/*define bit use in NFC_WCMD_SET*/
+#define NFC_PROGRAM_CMD (0xff << 0)
+#define NFC_RANDOM_WRITE_CMD (0xff << 8)
+#define NFC_READ_CMD0 (0xff << 16)
+#define NFC_READ_CMD1 (0xff << 24)
+
+/*define bit use in NFC_ECC_CTL*/
+#define NFC_ECC_EN (1 << 0)
+#define NFC_ECC_PIPELINE (1 << 3)
+#define NFC_ECC_EXCEPTION (1 << 4)
+#define NFC_ECC_BLOCK_SIZE (1 << 5)
+#define NFC_RANDOM_EN (1 << 9)
+#define NFC_RANDOM_DIRECTION (1 << 10)
+#define NFC_ECC_MODE_SHIFT 12
+#define NFC_ECC_MODE (0xf << NFC_ECC_MODE_SHIFT)
+#define NFC_RANDOM_SEED (0x7fff << 16)
+
+
+
+enum sunxi_nand_rb_type {
+ RB_NONE,
+ RB_NATIVE,
+ RB_GPIO,
+};
+
+struct sunxi_nand_rb {
+ enum sunxi_nand_rb_type type;
+ union {
+ int gpio;
+ int nativeid;
+ } info;
+};
+
+struct sunxi_nand_chip_sel {
+ u8 cs;
+ struct sunxi_nand_rb rb;
+};
+
+#define DEFAULT_NAME_FORMAT "nand@%d"
+#define MAX_NAME_SIZE (sizeof("nand@") + 2)
+
+struct sunxi_nand_chip {
+ struct list_head node;
+ struct nand_chip nand;
+ struct mtd_info mtd;
+ char default_name[MAX_NAME_SIZE];
+ unsigned long clk_rate;
+ int selected;
+ int nsels;
+ struct sunxi_nand_chip_sel sels[0];
+};
+
+static inline struct sunxi_nand_chip *to_sunxi_nand(struct mtd_info *mtd)
+{
+ return container_of(mtd, struct sunxi_nand_chip, mtd);
+}
+
+struct sunxi_nfc {
+ struct nand_hw_control controller;
+ void __iomem *regs;
+ int irq;
+ struct clk *ahb_clk;
+ struct clk *sclk;
+ unsigned long assigned_cs;
+ struct list_head chips;
+ struct completion complete;
+};
+
+static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_hw_control *ctrl)
+{
+ return container_of(ctrl, struct sunxi_nfc, controller);
+}
+
+static irqreturn_t sunxi_nfc_interrupt(int irq, void *dev_id)
+{
+ struct sunxi_nfc *nfc = dev_id;
+ u32 st = readl(nfc->regs + NFC_REG_ST);
+ u32 ien = readl(nfc->regs + NFC_REG_INT);
+
+ if (!(ien & st))
+ return IRQ_NONE;
+
+ if ((ien & st) == ien)
+ complete(&nfc->complete);
+
+ writel(st & NFC_INT_MASK, nfc->regs + NFC_REG_ST);
+ writel(~st & ien & NFC_INT_MASK, nfc->regs + NFC_REG_INT);
+
+ return IRQ_HANDLED;
+}
+
+static int sunxi_nfc_wait_int(struct sunxi_nfc *nfc, u32 flags,
+ unsigned int timeout_ms)
+{
+ init_completion(&nfc->complete);
+
+ writel(flags, nfc->regs + NFC_REG_INT);
+ if (!timeout_ms)
+ wait_for_completion(&nfc->complete);
+ else if (!wait_for_completion_timeout(&nfc->complete,
+ msecs_to_jiffies(timeout_ms)))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int sunxi_nfc_dev_ready(struct mtd_info *mtd)
+{
+ struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd);
+ struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
+ struct sunxi_nand_rb *rb;
+ unsigned long timeo = (sunxi_nand->nand.state == FL_ERASING ? 400 : 20);
+ int ret;
+
+ if (sunxi_nand->selected < 0)
+ return 0;
+
+ rb = &sunxi_nand->sels[sunxi_nand->selected].rb;
+
+ switch (rb->type) {
+ case RB_NATIVE:
+ ret = !!(readl(nfc->regs + NFC_REG_ST) &
+ (NFC_RB_STATE0 << rb->info.nativeid));
+ if (ret)
+ break;
+
+ sunxi_nfc_wait_int(nfc, NFC_RB_B2R, timeo);
+ ret = !!(readl(nfc->regs + NFC_REG_ST) &
+ (NFC_RB_STATE0 << rb->info.nativeid));
+ break;
+ case RB_GPIO:
+ ret = gpio_get_value(rb->info.gpio);
+ break;
+ case RB_NONE:
+ default:
+ ret = 0;
+ dev_err(&mtd->dev, "cannot check R/B NAND status!");
+ break;
+ }
+
+ return ret;
+}
+
+static void sunxi_nfc_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd);
+ struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
+ struct sunxi_nand_chip_sel *sel;
+ u32 ctl;
+
+ if (chip > 0 && chip >= sunxi_nand->nsels)
+ return;
+
+ if (chip == sunxi_nand->selected)
+ return;
+
+ ctl = readl(nfc->regs + NFC_REG_CTL) &
+ ~(NFC_CE_SEL | NFC_RB_SEL | NFC_EN);
+
+ if (chip >= 0) {
+ sel = &sunxi_nand->sels[chip];
+
+ ctl |= (sel->cs << 24) | NFC_EN |
+ (((sunxi_nand->nand.page_shift - 10) & 0xf) << 8);
+ if (sel->rb.type == RB_NONE) {
+ sunxi_nand->nand.dev_ready = NULL;
+ } else {
+ sunxi_nand->nand.dev_ready = sunxi_nfc_dev_ready;
+ if (sel->rb.type == RB_NATIVE)
+ ctl |= (sel->rb.info.nativeid << 3);
+ }
+ }
+
+ writel(ctl, nfc->regs + NFC_REG_CTL);
+ clk_set_rate(nfc->sclk, sunxi_nand->clk_rate);
+
+ sunxi_nand->selected = chip;
+}
+
+static void sunxi_nfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd);
+ struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
+ int cnt;
+ int offs = 0;
+
+ while (len > 0) {
+ cnt = len > 1024 ? 1024 : len;
+ while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS))
+ ;
+ writel(cnt, nfc->regs + NFC_REG_CNT);
+ writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_SEQ,
+ nfc->regs + NFC_REG_CMD);
+ sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
+ memcpy_fromio(buf + offs, nfc->regs + NFC_RAM0_BASE, cnt);
+ offs += cnt;
+ len -= cnt;
+ }
+}
+
+static void sunxi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf,
+ int len)
+{
+ struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd);
+ struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
+ int cnt;
+ int offs = 0;
+
+ while (len > 0) {
+ cnt = len > 1024 ? 1024 : len;
+ while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS))
+ ;
+ writel(cnt, nfc->regs + NFC_REG_CNT);
+ memcpy_toio(nfc->regs + NFC_RAM0_BASE, buf + offs, cnt);
+ writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD |
+ NFC_ACCESS_DIR | NFC_SEQ, nfc->regs + NFC_REG_CMD);
+ sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
+ offs += cnt;
+ len -= cnt;
+ }
+}
+
+static uint8_t sunxi_nfc_read_byte(struct mtd_info *mtd)
+{
+ uint8_t ret;
+
+ sunxi_nfc_read_buf(mtd, &ret, 1);
+
+ return ret;
+}
+
+static void sunxi_nfc_cmd_ctrl(struct mtd_info *mtd, int dat,
+ unsigned int ctrl)
+{
+ struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd);
+ struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
+ u32 tmp;
+
+ while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS))
+ ;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ tmp = readl(nfc->regs + NFC_REG_CTL);
+ if (ctrl & NAND_NCE)
+ tmp |= NFC_CE_CTL;
+ else
+ tmp &= ~NFC_CE_CTL;
+ writel(tmp, nfc->regs + NFC_REG_CTL);
+ }
+
+ if (dat == NAND_CMD_NONE)
+ return;
+
+ if (ctrl & NAND_CLE) {
+ writel(NFC_SEND_CMD1 | dat, nfc->regs + NFC_REG_CMD);
+ } else {
+ writel(dat, nfc->regs + NFC_REG_ADDR_LOW);
+ writel(NFC_SEND_ADR, nfc->regs + NFC_REG_CMD);
+ }
+
+ sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
+}
+
+static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
+ struct device_node *np)
+{
+ struct nand_timings timings;
+ u32 min_clk_period = 0;
+ int ret;
+
+ ret = of_get_nand_timings(np, &timings);
+ if (ret)
+ return ret;
+
+ /* NFC timings defined in Allwinner Datasheets */
+
+ /* T1 <=> tCLS */
+ if (timings.tCLS_min > min_clk_period)
+ min_clk_period = timings.tCLS_min;
+
+ /* T2 <=> tCLH */
+ if (timings.tCLH_min > min_clk_period)
+ min_clk_period = timings.tCLH_min;
+
+ /* T3 <=> tCS */
+ if (timings.tCS_min > min_clk_period)
+ min_clk_period = timings.tCS_min;
+
+ /* T4 <=> tCH */
+ if (timings.tCH_min > min_clk_period)
+ min_clk_period = timings.tCH_min;
+
+ /* T5 <=> tWP */
+ if (timings.tWP_min > min_clk_period)
+ min_clk_period = timings.tWP_min;
+
+ /* T6 <=> tWH */
+ if (timings.tWH_min > min_clk_period)
+ min_clk_period = timings.tWH_min;
+
+ /* T7 <=> tALS */
+ if (timings.tALS_min > min_clk_period)
+ min_clk_period = timings.tALS_min;
+
+ /* T8 <=> tDS */
+ if (timings.tDS_min > min_clk_period)
+ min_clk_period = timings.tDS_min;
+
+ /* T9 <=> tDH */
+ if (timings.tDH_min > min_clk_period)
+ min_clk_period = timings.tDH_min;
+
+ /* T10 <=> tRR */
+ if (timings.tRR_min > (min_clk_period * 3))
+ min_clk_period = (timings.tRR_min + 2) / 3;
+
+ /* T11 <=> tALH */
+ if (timings.tALH_min > min_clk_period)
+ min_clk_period = timings.tALH_min;
+
+ /* T12 <=> tRP */
+ if (timings.tRP_min > min_clk_period)
+ min_clk_period = timings.tRP_min;
+
+ /* T13 <=> tREH */
+ if (timings.tREH_min > min_clk_period)
+ min_clk_period = timings.tREH_min;
+
+ /* T14 <=> tRC */
+ if (timings.tRC_min > (min_clk_period * 2))
+ min_clk_period = (timings.tRC_min + 1) / 2;
+
+ /* T15 <=> tWC */
+ if (timings.tWC_min > (min_clk_period * 2))
+ min_clk_period = (timings.tWC_min + 1) / 2;
+
+
+ /* min_clk_period = (NAND-clk-period * 2) */
+ if (!min_clk_period)
+ chip->clk_rate = 20000000;
+ else
+ chip->clk_rate = (2 * 1000000000) / min_clk_period;
+
+ /* TODO: configure T16-T19 */
+
+ return 0;
+}
+
+static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
+ struct device_node *np)
+{
+ struct sunxi_nand_chip *chip;
+ struct mtd_part_parser_data ppdata;
+ struct mtd_info *mtd;
+ struct nand_chip *nand;
+ int nsels;
+ int ret;
+ int i;
+ u32 tmp;
+
+ if (!of_get_property(np, "reg", &nsels))
+ return -EINVAL;
+
+ nsels /= sizeof(u32);
+ if (!nsels)
+ return -EINVAL;
+
+ chip = devm_kzalloc(dev,
+ sizeof(*chip) +
+ (nsels * sizeof(struct sunxi_nand_chip_sel)),
+ GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->nsels = nsels;
+ chip->selected = -1;
+
+ for (i = 0; i < nsels; i++) {
+ ret = of_property_read_u32_index(np, "reg", i, &tmp);
+ if (ret)
+ return ret;
+
+ if (tmp > 7)
+ return -EINVAL;
+
+ if (test_and_set_bit(tmp, &nfc->assigned_cs))
+ return -EINVAL;
+
+ chip->sels[i].cs = tmp;
+
+ if (!of_property_read_u32_index(np, "allwinner,rb", i, &tmp) &&
+ tmp < 2) {
+ chip->sels[i].rb.type = RB_NATIVE;
+ chip->sels[i].rb.info.nativeid = tmp;
+ } else {
+ ret = of_get_named_gpio(np, "rb-gpios", i);
+ if (ret >= 0) {
+ chip->sels[i].rb.type = RB_GPIO;
+ chip->sels[i].rb.info.gpio = tmp;
+ ret = devm_gpio_request(dev, tmp, "nand-rb");
+ if (ret)
+ return ret;
+ } else {
+ chip->sels[i].rb.type = RB_NONE;
+ }
+ }
+ }
+
+ ret = sunxi_nand_chip_init_timings(chip, np);
+ if (ret)
+ return ret;
+
+ nand = &chip->nand;
+ nand->IO_ADDR_R = nand->IO_ADDR_W = nfc->regs + NFC_REG_IO_DATA;
+ nand->controller = &nfc->controller;
+ nand->select_chip = sunxi_nfc_select_chip;
+ nand->cmd_ctrl = sunxi_nfc_cmd_ctrl;
+ nand->read_buf = sunxi_nfc_read_buf;
+ nand->write_buf = sunxi_nfc_write_buf;
+ nand->read_byte = sunxi_nfc_read_byte;
+
+ nand->ecc.mode = of_get_nand_ecc_mode(np);
+ if (of_get_nand_on_flash_bbt(np))
+ nand->bbt_options |= NAND_BBT_USE_FLASH;
+
+ mtd = &chip->mtd;
+ mtd->priv = nand;
+ mtd->owner = THIS_MODULE;
+
+ ret = nand_scan_ident(mtd, nsels, NULL);
+ if (ret)
+ return ret;
+
+ if (nand->ecc.mode == NAND_ECC_SOFT_BCH) {
+ nand->ecc.size = nand->ecc_step_ds;
+ nand->ecc.bytes = (((nand->ecc_strength_ds *
+ fls(8 * nand->ecc_step_ds)) + 7) / 8);
+ }
+
+ ret = nand_scan_tail(mtd);
+ if (ret)
+ return ret;
+
+ if (of_property_read_string(np, "nand-name", &mtd->name)) {
+ snprintf(chip->default_name, MAX_NAME_SIZE,
+ DEFAULT_NAME_FORMAT, chip->sels[i].cs);
+ mtd->name = chip->default_name;
+ }
+
+ ppdata.of_node = np;
+ ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
+ if (!ret)
+ return ret;
+
+ list_add_tail(&chip->node, &nfc->chips);
+
+ return 0;
+}
+
+static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *nand_np;
+ int nchips = of_get_child_count(np);
+ int ret;
+
+ if (nchips > 8)
+ return -EINVAL;
+
+ for_each_child_of_node(np, nand_np) {
+ ret = sunxi_nand_chip_init(dev, nfc, nand_np);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int sunxi_nfc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *r;
+ struct sunxi_nfc *nfc;
+ int ret;
+
+ nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
+ if (!nfc) {
+ dev_err(dev, "failed to allocate NFC struct\n");
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&nfc->controller.lock);
+ init_waitqueue_head(&nfc->controller.wq);
+ INIT_LIST_HEAD(&nfc->chips);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ nfc->regs = devm_ioremap_resource(dev, r);
+ if (IS_ERR(nfc->regs)) {
+ dev_err(dev, "failed to remap iomem\n");
+ return PTR_ERR(nfc->regs);
+ }
+
+ nfc->irq = platform_get_irq(pdev, 0);
+ if (nfc->irq < 0) {
+ dev_err(dev, "failed to retrieve irq\n");
+ return nfc->irq;
+ }
+
+ nfc->ahb_clk = devm_clk_get(dev, "ahb_clk");
+ if (IS_ERR(nfc->ahb_clk)) {
+ dev_err(dev, "failed to retrieve ahb_clk\n");
+ return PTR_ERR(nfc->ahb_clk);
+ }
+
+ ret = clk_prepare_enable(nfc->ahb_clk);
+ if (ret)
+ return ret;
+
+ nfc->sclk = devm_clk_get(dev, "sclk");
+ if (IS_ERR(nfc->sclk)) {
+ dev_err(dev, "failed to retrieve nand_clk\n");
+ ret = PTR_ERR(nfc->sclk);
+ goto out_ahb_clk_unprepare;
+ }
+
+ ret = clk_prepare_enable(nfc->sclk);
+ if (ret)
+ goto out_ahb_clk_unprepare;
+
+ /* Reset NFC */
+ writel(readl(nfc->regs + NFC_REG_CTL) | NFC_RESET,
+ nfc->regs + NFC_REG_CTL);
+ while (readl(nfc->regs + NFC_REG_CTL) & NFC_RESET)
+ ;
+
+ writel(0, nfc->regs + NFC_REG_INT);
+ ret = devm_request_irq(dev, nfc->irq, sunxi_nfc_interrupt,
+ 0, "sunxi-nfc", nfc);
+ if (ret)
+ goto out_sclk_unprepare;
+
+ platform_set_drvdata(pdev, nfc);
+
+ writel(0x100, nfc->regs + NFC_REG_TIMING_CTL);
+ writel(0x7ff, nfc->regs + NFC_REG_TIMING_CFG);
+
+ ret = sunxi_nand_chips_init(dev, nfc);
+ if (ret) {
+ dev_err(dev, "failed to init nand chips\n");
+ goto out_sclk_unprepare;
+ }
+
+ return 0;
+
+out_sclk_unprepare:
+ clk_disable_unprepare(nfc->sclk);
+out_ahb_clk_unprepare:
+ clk_disable_unprepare(nfc->ahb_clk);
+
+ return ret;
+}
+
+static const struct of_device_id sunxi_nfc_ids[] = {
+ { .compatible = "allwinner,sun4i-nfc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sunxi_nfc_ids);
+
+static struct platform_driver sunxi_nfc_driver = {
+ .driver = {
+ .name = "sunxi_nfc",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(sunxi_nfc_ids),
+ },
+ .probe = sunxi_nfc_probe,
+};
+module_platform_driver(sunxi_nfc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Boris BREZILLON");
+MODULE_DESCRIPTION("Allwinner NAND Flash Controller driver");
+MODULE_ALIAS("platform:sunxi_nfc");
