mtd: nand: add tango NAND flash controller support
This driver supports the NAND Flash controller embedded in recent Tango chips, such as SMP8758 and SMP8759. Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Marc Gonzalez
Boris Brezillon
parent
c3d03de396
commit
6956e2385a
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@ -196,6 +196,13 @@ config MTD_NAND_S3C2410_CLKSTOP
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when the is NAND chip selected or released, but will save
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approximately 5mA of power when there is nothing happening.
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config MTD_NAND_TANGO
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tristate "NAND Flash support for Tango chips"
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depends on ARCH_TANGO || COMPILE_TEST
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depends on HAS_DMA
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help
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Enables the NAND Flash controller on Tango chips.
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config MTD_NAND_DISKONCHIP
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tristate "DiskOnChip 2000, Millennium and Millennium Plus (NAND reimplementation)"
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depends on HAS_IOMEM
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@ -16,6 +16,7 @@ obj-$(CONFIG_MTD_NAND_DENALI_DT) += denali_dt.o
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obj-$(CONFIG_MTD_NAND_AU1550) += au1550nd.o
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obj-$(CONFIG_MTD_NAND_BF5XX) += bf5xx_nand.o
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obj-$(CONFIG_MTD_NAND_S3C2410) += s3c2410.o
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obj-$(CONFIG_MTD_NAND_TANGO) += tango_nand.o
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obj-$(CONFIG_MTD_NAND_DAVINCI) += davinci_nand.o
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obj-$(CONFIG_MTD_NAND_DISKONCHIP) += diskonchip.o
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obj-$(CONFIG_MTD_NAND_DOCG4) += docg4.o
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@ -0,0 +1,658 @@
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/clk.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/mtd/nand.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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/* Offsets relative to chip->base */
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#define PBUS_CMD 0
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#define PBUS_ADDR 4
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#define PBUS_DATA 8
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/* Offsets relative to reg_base */
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#define NFC_STATUS 0x00
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#define NFC_FLASH_CMD 0x04
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#define NFC_DEVICE_CFG 0x08
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#define NFC_TIMING1 0x0c
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#define NFC_TIMING2 0x10
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#define NFC_XFER_CFG 0x14
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#define NFC_PKT_0_CFG 0x18
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#define NFC_PKT_N_CFG 0x1c
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#define NFC_BB_CFG 0x20
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#define NFC_ADDR_PAGE 0x24
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#define NFC_ADDR_OFFSET 0x28
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#define NFC_XFER_STATUS 0x2c
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/* NFC_STATUS values */
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#define CMD_READY BIT(31)
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/* NFC_FLASH_CMD values */
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#define NFC_READ 1
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#define NFC_WRITE 2
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/* NFC_XFER_STATUS values */
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#define PAGE_IS_EMPTY BIT(16)
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/* Offsets relative to mem_base */
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#define METADATA 0x000
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#define ERROR_REPORT 0x1c0
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/*
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* Error reports are split in two bytes:
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* byte 0 for the first packet in the page (PKT_0)
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* byte 1 for other packets in the page (PKT_N, for N > 0)
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* ERR_COUNT_PKT_N is the max error count over all but the first packet.
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*/
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#define DECODE_OK_PKT_0(v) ((v) & BIT(7))
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#define DECODE_OK_PKT_N(v) ((v) & BIT(15))
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#define ERR_COUNT_PKT_0(v) (((v) >> 0) & 0x3f)
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#define ERR_COUNT_PKT_N(v) (((v) >> 8) & 0x3f)
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/* Offsets relative to pbus_base */
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#define PBUS_CS_CTRL 0x83c
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#define PBUS_PAD_MODE 0x8f0
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/* PBUS_CS_CTRL values */
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#define PBUS_IORDY BIT(31)
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/*
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* PBUS_PAD_MODE values
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* In raw mode, the driver communicates directly with the NAND chips.
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* In NFC mode, the NAND Flash controller manages the communication.
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* We use NFC mode for read and write; raw mode for everything else.
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*/
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#define MODE_RAW 0
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#define MODE_NFC BIT(31)
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#define METADATA_SIZE 4
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#define BBM_SIZE 6
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#define FIELD_ORDER 15
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#define MAX_CS 4
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struct tango_nfc {
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struct nand_hw_control hw;
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void __iomem *reg_base;
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void __iomem *mem_base;
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void __iomem *pbus_base;
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struct tango_chip *chips[MAX_CS];
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struct dma_chan *chan;
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int freq_kHz;
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};
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#define to_tango_nfc(ptr) container_of(ptr, struct tango_nfc, hw)
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struct tango_chip {
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struct nand_chip nand_chip;
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void __iomem *base;
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u32 timing1;
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u32 timing2;
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u32 xfer_cfg;
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u32 pkt_0_cfg;
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u32 pkt_n_cfg;
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u32 bb_cfg;
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};
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#define to_tango_chip(ptr) container_of(ptr, struct tango_chip, nand_chip)
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#define XFER_CFG(cs, page_count, steps, metadata_size) \
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((cs) << 24 | (page_count) << 16 | (steps) << 8 | (metadata_size))
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#define PKT_CFG(size, strength) ((size) << 16 | (strength))
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#define BB_CFG(bb_offset, bb_size) ((bb_offset) << 16 | (bb_size))
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#define TIMING(t0, t1, t2, t3) ((t0) << 24 | (t1) << 16 | (t2) << 8 | (t3))
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static void tango_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
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{
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struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
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if (ctrl & NAND_CLE)
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writeb_relaxed(dat, tchip->base + PBUS_CMD);
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if (ctrl & NAND_ALE)
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writeb_relaxed(dat, tchip->base + PBUS_ADDR);
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}
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static int tango_dev_ready(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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struct tango_nfc *nfc = to_tango_nfc(chip->controller);
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return readl_relaxed(nfc->pbus_base + PBUS_CS_CTRL) & PBUS_IORDY;
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}
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static u8 tango_read_byte(struct mtd_info *mtd)
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{
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struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
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return readb_relaxed(tchip->base + PBUS_DATA);
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}
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static void tango_read_buf(struct mtd_info *mtd, u8 *buf, int len)
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{
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struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
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ioread8_rep(tchip->base + PBUS_DATA, buf, len);
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}
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static void tango_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
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{
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struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
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iowrite8_rep(tchip->base + PBUS_DATA, buf, len);
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}
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static void tango_select_chip(struct mtd_info *mtd, int idx)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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struct tango_nfc *nfc = to_tango_nfc(chip->controller);
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struct tango_chip *tchip = to_tango_chip(chip);
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if (idx < 0)
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return; /* No "chip unselect" function */
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writel_relaxed(tchip->timing1, nfc->reg_base + NFC_TIMING1);
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writel_relaxed(tchip->timing2, nfc->reg_base + NFC_TIMING2);
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writel_relaxed(tchip->xfer_cfg, nfc->reg_base + NFC_XFER_CFG);
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writel_relaxed(tchip->pkt_0_cfg, nfc->reg_base + NFC_PKT_0_CFG);
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writel_relaxed(tchip->pkt_n_cfg, nfc->reg_base + NFC_PKT_N_CFG);
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writel_relaxed(tchip->bb_cfg, nfc->reg_base + NFC_BB_CFG);
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}
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/*
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* The controller does not check for bitflips in erased pages,
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* therefore software must check instead.
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*/
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static int check_erased_page(struct nand_chip *chip, u8 *buf)
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{
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u8 *meta = chip->oob_poi + BBM_SIZE;
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u8 *ecc = chip->oob_poi + BBM_SIZE + METADATA_SIZE;
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const int ecc_size = chip->ecc.bytes;
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const int pkt_size = chip->ecc.size;
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int i, res, meta_len, bitflips = 0;
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for (i = 0; i < chip->ecc.steps; ++i) {
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meta_len = i ? 0 : METADATA_SIZE;
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res = nand_check_erased_ecc_chunk(buf, pkt_size, ecc, ecc_size,
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meta, meta_len,
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chip->ecc.strength);
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if (res < 0)
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chip->mtd.ecc_stats.failed++;
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bitflips = max(res, bitflips);
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buf += pkt_size;
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ecc += ecc_size;
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}
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return bitflips;
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}
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static int decode_error_report(struct tango_nfc *nfc)
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{
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u32 status, res;
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status = readl_relaxed(nfc->reg_base + NFC_XFER_STATUS);
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if (status & PAGE_IS_EMPTY)
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return 0;
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res = readl_relaxed(nfc->mem_base + ERROR_REPORT);
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if (DECODE_OK_PKT_0(res) && DECODE_OK_PKT_N(res))
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return max(ERR_COUNT_PKT_0(res), ERR_COUNT_PKT_N(res));
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return -EBADMSG;
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}
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static void tango_dma_callback(void *arg)
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{
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complete(arg);
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}
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static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
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int len, int page)
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{
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void __iomem *addr = nfc->reg_base + NFC_STATUS;
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struct dma_chan *chan = nfc->chan;
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struct dma_async_tx_descriptor *desc;
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struct scatterlist sg;
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struct completion tx_done;
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int err = -EIO;
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u32 res, val;
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sg_init_one(&sg, buf, len);
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if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
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return -EIO;
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desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
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if (!desc)
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goto dma_unmap;
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desc->callback = tango_dma_callback;
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desc->callback_param = &tx_done;
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init_completion(&tx_done);
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writel_relaxed(MODE_NFC, nfc->pbus_base + PBUS_PAD_MODE);
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writel_relaxed(page, nfc->reg_base + NFC_ADDR_PAGE);
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writel_relaxed(0, nfc->reg_base + NFC_ADDR_OFFSET);
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writel_relaxed(cmd, nfc->reg_base + NFC_FLASH_CMD);
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dmaengine_submit(desc);
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dma_async_issue_pending(chan);
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res = wait_for_completion_timeout(&tx_done, HZ);
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if (res > 0)
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err = readl_poll_timeout(addr, val, val & CMD_READY, 0, 1000);
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writel_relaxed(MODE_RAW, nfc->pbus_base + PBUS_PAD_MODE);
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dma_unmap:
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dma_unmap_sg(chan->device->dev, &sg, 1, dir);
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return err;
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}
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static int tango_read_page(struct mtd_info *mtd, struct nand_chip *chip,
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u8 *buf, int oob_required, int page)
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{
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struct tango_nfc *nfc = to_tango_nfc(chip->controller);
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int err, res, len = mtd->writesize;
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if (oob_required)
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chip->ecc.read_oob(mtd, chip, page);
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err = do_dma(nfc, DMA_FROM_DEVICE, NFC_READ, buf, len, page);
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if (err)
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return err;
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res = decode_error_report(nfc);
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if (res < 0) {
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chip->ecc.read_oob_raw(mtd, chip, page);
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res = check_erased_page(chip, buf);
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}
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return res;
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}
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static int tango_write_page(struct mtd_info *mtd, struct nand_chip *chip,
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const u8 *buf, int oob_required, int page)
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{
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struct tango_nfc *nfc = to_tango_nfc(chip->controller);
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int err, len = mtd->writesize;
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/* Calling tango_write_oob() would send PAGEPROG twice */
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if (oob_required)
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return -ENOTSUPP;
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writel_relaxed(0xffffffff, nfc->mem_base + METADATA);
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err = do_dma(nfc, DMA_TO_DEVICE, NFC_WRITE, buf, len, page);
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if (err)
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return err;
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return 0;
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}
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static void aux_read(struct nand_chip *chip, u8 **buf, int len, int *pos)
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{
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*pos += len;
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if (!*buf) {
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/* skip over "len" bytes */
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chip->cmdfunc(&chip->mtd, NAND_CMD_RNDOUT, *pos, -1);
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} else {
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tango_read_buf(&chip->mtd, *buf, len);
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*buf += len;
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}
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}
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static void aux_write(struct nand_chip *chip, const u8 **buf, int len, int *pos)
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{
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*pos += len;
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if (!*buf) {
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/* skip over "len" bytes */
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chip->cmdfunc(&chip->mtd, NAND_CMD_SEQIN, *pos, -1);
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} else {
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tango_write_buf(&chip->mtd, *buf, len);
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*buf += len;
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}
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}
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/*
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* Physical page layout (not drawn to scale)
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*
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* NB: Bad Block Marker area splits PKT_N in two (N1, N2).
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*
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* +---+-----------------+-------+-----+-----------+-----+----+-------+
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* | M | PKT_0 | ECC_0 | ... | N1 | BBM | N2 | ECC_N |
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* +---+-----------------+-------+-----+-----------+-----+----+-------+
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*
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* Logical page layout:
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*
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* +-----+---+-------+-----+-------+
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* oob = | BBM | M | ECC_0 | ... | ECC_N |
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* +-----+---+-------+-----+-------+
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*
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* +-----------------+-----+-----------------+
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* buf = | PKT_0 | ... | PKT_N |
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* +-----------------+-----+-----------------+
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*/
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static int raw_read(struct nand_chip *chip, u8 *buf, u8 *oob)
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{
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u8 *oob_orig = oob;
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const int page_size = chip->mtd.writesize;
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const int ecc_size = chip->ecc.bytes;
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const int pkt_size = chip->ecc.size;
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int pos = 0; /* position within physical page */
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int rem = page_size; /* bytes remaining until BBM area */
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if (oob)
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oob += BBM_SIZE;
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aux_read(chip, &oob, METADATA_SIZE, &pos);
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while (rem > pkt_size) {
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aux_read(chip, &buf, pkt_size, &pos);
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aux_read(chip, &oob, ecc_size, &pos);
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rem = page_size - pos;
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}
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aux_read(chip, &buf, rem, &pos);
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aux_read(chip, &oob_orig, BBM_SIZE, &pos);
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aux_read(chip, &buf, pkt_size - rem, &pos);
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aux_read(chip, &oob, ecc_size, &pos);
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return 0;
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}
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static int raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob)
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{
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const u8 *oob_orig = oob;
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const int page_size = chip->mtd.writesize;
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const int ecc_size = chip->ecc.bytes;
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const int pkt_size = chip->ecc.size;
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int pos = 0; /* position within physical page */
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int rem = page_size; /* bytes remaining until BBM area */
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if (oob)
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oob += BBM_SIZE;
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aux_write(chip, &oob, METADATA_SIZE, &pos);
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while (rem > pkt_size) {
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aux_write(chip, &buf, pkt_size, &pos);
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aux_write(chip, &oob, ecc_size, &pos);
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rem = page_size - pos;
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}
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aux_write(chip, &buf, rem, &pos);
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aux_write(chip, &oob_orig, BBM_SIZE, &pos);
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aux_write(chip, &buf, pkt_size - rem, &pos);
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aux_write(chip, &oob, ecc_size, &pos);
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return 0;
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}
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static int tango_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
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u8 *buf, int oob_required, int page)
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{
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return raw_read(chip, buf, chip->oob_poi);
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}
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static int tango_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
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const u8 *buf, int oob_required, int page)
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{
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return raw_write(chip, buf, chip->oob_poi);
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}
|
||||
|
||||
static int tango_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
|
||||
int page)
|
||||
{
|
||||
chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
|
||||
return raw_read(chip, NULL, chip->oob_poi);
|
||||
}
|
||||
|
||||
static int tango_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
|
||||
int page)
|
||||
{
|
||||
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0, page);
|
||||
raw_write(chip, NULL, chip->oob_poi);
|
||||
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
|
||||
chip->waitfunc(mtd, chip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int oob_ecc(struct mtd_info *mtd, int idx, struct mtd_oob_region *res)
|
||||
{
|
||||
struct nand_chip *chip = mtd_to_nand(mtd);
|
||||
struct nand_ecc_ctrl *ecc = &chip->ecc;
|
||||
|
||||
if (idx >= ecc->steps)
|
||||
return -ERANGE;
|
||||
|
||||
res->offset = BBM_SIZE + METADATA_SIZE + ecc->bytes * idx;
|
||||
res->length = ecc->bytes;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int oob_free(struct mtd_info *mtd, int idx, struct mtd_oob_region *res)
|
||||
{
|
||||
return -ERANGE; /* no free space in spare area */
|
||||
}
|
||||
|
||||
static const struct mtd_ooblayout_ops tango_nand_ooblayout_ops = {
|
||||
.ecc = oob_ecc,
|
||||
.free = oob_free,
|
||||
};
|
||||
|
||||
static u32 to_ticks(int kHz, int ps)
|
||||
{
|
||||
return DIV_ROUND_UP_ULL((u64)kHz * ps, NSEC_PER_SEC);
|
||||
}
|
||||
|
||||
static int tango_set_timings(struct mtd_info *mtd,
|
||||
const struct nand_data_interface *conf,
|
||||
bool check_only)
|
||||
{
|
||||
const struct nand_sdr_timings *sdr = nand_get_sdr_timings(conf);
|
||||
struct nand_chip *chip = mtd_to_nand(mtd);
|
||||
struct tango_nfc *nfc = to_tango_nfc(chip->controller);
|
||||
struct tango_chip *tchip = to_tango_chip(chip);
|
||||
u32 Trdy, Textw, Twc, Twpw, Tacc, Thold, Trpw, Textr;
|
||||
int kHz = nfc->freq_kHz;
|
||||
|
||||
if (IS_ERR(sdr))
|
||||
return PTR_ERR(sdr);
|
||||
|
||||
if (check_only)
|
||||
return 0;
|
||||
|
||||
Trdy = to_ticks(kHz, sdr->tCEA_max - sdr->tREA_max);
|
||||
Textw = to_ticks(kHz, sdr->tWB_max);
|
||||
Twc = to_ticks(kHz, sdr->tWC_min);
|
||||
Twpw = to_ticks(kHz, sdr->tWC_min - sdr->tWP_min);
|
||||
|
||||
Tacc = to_ticks(kHz, sdr->tREA_max);
|
||||
Thold = to_ticks(kHz, sdr->tREH_min);
|
||||
Trpw = to_ticks(kHz, sdr->tRC_min - sdr->tREH_min);
|
||||
Textr = to_ticks(kHz, sdr->tRHZ_max);
|
||||
|
||||
tchip->timing1 = TIMING(Trdy, Textw, Twc, Twpw);
|
||||
tchip->timing2 = TIMING(Tacc, Thold, Trpw, Textr);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int chip_init(struct device *dev, struct device_node *np)
|
||||
{
|
||||
u32 cs;
|
||||
int err, res;
|
||||
struct mtd_info *mtd;
|
||||
struct nand_chip *chip;
|
||||
struct tango_chip *tchip;
|
||||
struct nand_ecc_ctrl *ecc;
|
||||
struct tango_nfc *nfc = dev_get_drvdata(dev);
|
||||
|
||||
tchip = devm_kzalloc(dev, sizeof(*tchip), GFP_KERNEL);
|
||||
if (!tchip)
|
||||
return -ENOMEM;
|
||||
|
||||
res = of_property_count_u32_elems(np, "reg");
|
||||
if (res < 0)
|
||||
return res;
|
||||
|
||||
if (res != 1)
|
||||
return -ENOTSUPP; /* Multi-CS chips are not supported */
|
||||
|
||||
err = of_property_read_u32_index(np, "reg", 0, &cs);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (cs >= MAX_CS)
|
||||
return -EINVAL;
|
||||
|
||||
chip = &tchip->nand_chip;
|
||||
ecc = &chip->ecc;
|
||||
mtd = &chip->mtd;
|
||||
|
||||
chip->read_byte = tango_read_byte;
|
||||
chip->write_buf = tango_write_buf;
|
||||
chip->read_buf = tango_read_buf;
|
||||
chip->select_chip = tango_select_chip;
|
||||
chip->cmd_ctrl = tango_cmd_ctrl;
|
||||
chip->dev_ready = tango_dev_ready;
|
||||
chip->setup_data_interface = tango_set_timings;
|
||||
chip->options = NAND_USE_BOUNCE_BUFFER |
|
||||
NAND_NO_SUBPAGE_WRITE |
|
||||
NAND_WAIT_TCCS;
|
||||
chip->controller = &nfc->hw;
|
||||
tchip->base = nfc->pbus_base + (cs * 256);
|
||||
|
||||
nand_set_flash_node(chip, np);
|
||||
mtd_set_ooblayout(mtd, &tango_nand_ooblayout_ops);
|
||||
mtd->dev.parent = dev;
|
||||
|
||||
err = nand_scan_ident(mtd, 1, NULL);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
ecc->mode = NAND_ECC_HW;
|
||||
ecc->algo = NAND_ECC_BCH;
|
||||
ecc->bytes = DIV_ROUND_UP(ecc->strength * FIELD_ORDER, BITS_PER_BYTE);
|
||||
|
||||
ecc->read_page_raw = tango_read_page_raw;
|
||||
ecc->write_page_raw = tango_write_page_raw;
|
||||
ecc->read_page = tango_read_page;
|
||||
ecc->write_page = tango_write_page;
|
||||
ecc->read_oob = tango_read_oob;
|
||||
ecc->write_oob = tango_write_oob;
|
||||
|
||||
err = nand_scan_tail(mtd);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
tchip->xfer_cfg = XFER_CFG(cs, 1, ecc->steps, METADATA_SIZE);
|
||||
tchip->pkt_0_cfg = PKT_CFG(ecc->size + METADATA_SIZE, ecc->strength);
|
||||
tchip->pkt_n_cfg = PKT_CFG(ecc->size, ecc->strength);
|
||||
tchip->bb_cfg = BB_CFG(mtd->writesize, BBM_SIZE);
|
||||
|
||||
err = mtd_device_register(mtd, NULL, 0);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
nfc->chips[cs] = tchip;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tango_nand_remove(struct platform_device *pdev)
|
||||
{
|
||||
int cs;
|
||||
struct tango_nfc *nfc = platform_get_drvdata(pdev);
|
||||
|
||||
dma_release_channel(nfc->chan);
|
||||
|
||||
for (cs = 0; cs < MAX_CS; ++cs) {
|
||||
if (nfc->chips[cs])
|
||||
nand_release(&nfc->chips[cs]->nand_chip.mtd);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tango_nand_probe(struct platform_device *pdev)
|
||||
{
|
||||
int err;
|
||||
struct clk *clk;
|
||||
struct resource *res;
|
||||
struct tango_nfc *nfc;
|
||||
struct device_node *np;
|
||||
|
||||
nfc = devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL);
|
||||
if (!nfc)
|
||||
return -ENOMEM;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
nfc->reg_base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(nfc->reg_base))
|
||||
return PTR_ERR(nfc->reg_base);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
nfc->mem_base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(nfc->mem_base))
|
||||
return PTR_ERR(nfc->mem_base);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
|
||||
nfc->pbus_base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(nfc->pbus_base))
|
||||
return PTR_ERR(nfc->pbus_base);
|
||||
|
||||
clk = clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(clk))
|
||||
return PTR_ERR(clk);
|
||||
|
||||
nfc->chan = dma_request_chan(&pdev->dev, "nfc_sbox");
|
||||
if (IS_ERR(nfc->chan))
|
||||
return PTR_ERR(nfc->chan);
|
||||
|
||||
platform_set_drvdata(pdev, nfc);
|
||||
nand_hw_control_init(&nfc->hw);
|
||||
nfc->freq_kHz = clk_get_rate(clk) / 1000;
|
||||
|
||||
for_each_child_of_node(pdev->dev.of_node, np) {
|
||||
err = chip_init(&pdev->dev, np);
|
||||
if (err) {
|
||||
tango_nand_remove(pdev);
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id tango_nand_ids[] = {
|
||||
{ .compatible = "sigma,smp8758-nand" },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
|
||||
static struct platform_driver tango_nand_driver = {
|
||||
.probe = tango_nand_probe,
|
||||
.remove = tango_nand_remove,
|
||||
.driver = {
|
||||
.name = "tango-nand",
|
||||
.of_match_table = tango_nand_ids,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(tango_nand_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Sigma Designs");
|
||||
MODULE_DESCRIPTION("Tango4 NAND Flash controller driver");
|
||||
Loading…
Reference in New Issue