+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2016 Sigma Designs
- */
-
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/clk.h>
-#include <linux/iopoll.h>
-#include <linux/module.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/platform_device.h>
-
-/* Offsets relative to chip->base */
-#define PBUS_CMD 0
-#define PBUS_ADDR 4
-#define PBUS_DATA 8
-
-/* Offsets relative to reg_base */
-#define NFC_STATUS 0x00
-#define NFC_FLASH_CMD 0x04
-#define NFC_DEVICE_CFG 0x08
-#define NFC_TIMING1 0x0c
-#define NFC_TIMING2 0x10
-#define NFC_XFER_CFG 0x14
-#define NFC_PKT_0_CFG 0x18
-#define NFC_PKT_N_CFG 0x1c
-#define NFC_BB_CFG 0x20
-#define NFC_ADDR_PAGE 0x24
-#define NFC_ADDR_OFFSET 0x28
-#define NFC_XFER_STATUS 0x2c
-
-/* NFC_STATUS values */
-#define CMD_READY BIT(31)
-
-/* NFC_FLASH_CMD values */
-#define NFC_READ 1
-#define NFC_WRITE 2
-
-/* NFC_XFER_STATUS values */
-#define PAGE_IS_EMPTY BIT(16)
-
-/* Offsets relative to mem_base */
-#define METADATA 0x000
-#define ERROR_REPORT 0x1c0
-
-/*
- * Error reports are split in two bytes:
- * byte 0 for the first packet in the page (PKT_0)
- * byte 1 for other packets in the page (PKT_N, for N > 0)
- * ERR_COUNT_PKT_N is the max error count over all but the first packet.
- */
-#define ERR_COUNT_PKT_0(v) (((v) >> 0) & 0x3f)
-#define ERR_COUNT_PKT_N(v) (((v) >> 8) & 0x3f)
-#define DECODE_FAIL_PKT_0(v) (((v) & BIT(7)) == 0)
-#define DECODE_FAIL_PKT_N(v) (((v) & BIT(15)) == 0)
-
-/* Offsets relative to pbus_base */
-#define PBUS_CS_CTRL 0x83c
-#define PBUS_PAD_MODE 0x8f0
-
-/* PBUS_CS_CTRL values */
-#define PBUS_IORDY BIT(31)
-
-/*
- * PBUS_PAD_MODE values
- * In raw mode, the driver communicates directly with the NAND chips.
- * In NFC mode, the NAND Flash controller manages the communication.
- * We use NFC mode for read and write; raw mode for everything else.
- */
-#define MODE_RAW 0
-#define MODE_NFC BIT(31)
-
-#define METADATA_SIZE 4
-#define BBM_SIZE 6
-#define FIELD_ORDER 15
-
-#define MAX_CS 4
-
-struct tango_nfc {
- struct nand_controller hw;
- void __iomem *reg_base;
- void __iomem *mem_base;
- void __iomem *pbus_base;
- struct tango_chip *chips[MAX_CS];
- struct dma_chan *chan;
- int freq_kHz;
-};
-
-#define to_tango_nfc(ptr) container_of(ptr, struct tango_nfc, hw)
-
-struct tango_chip {
- struct nand_chip nand_chip;
- void __iomem *base;
- u32 timing1;
- u32 timing2;
- u32 xfer_cfg;
- u32 pkt_0_cfg;
- u32 pkt_n_cfg;
- u32 bb_cfg;
-};
-
-#define to_tango_chip(ptr) container_of(ptr, struct tango_chip, nand_chip)
-
-#define XFER_CFG(cs, page_count, steps, metadata_size) \
- ((cs) << 24 | (page_count) << 16 | (steps) << 8 | (metadata_size))
-
-#define PKT_CFG(size, strength) ((size) << 16 | (strength))
-
-#define BB_CFG(bb_offset, bb_size) ((bb_offset) << 16 | (bb_size))
-
-#define TIMING(t0, t1, t2, t3) ((t0) << 24 | (t1) << 16 | (t2) << 8 | (t3))
-
-static void tango_select_target(struct nand_chip *chip, unsigned int cs)
-{
- struct tango_nfc *nfc = to_tango_nfc(chip->controller);
- struct tango_chip *tchip = to_tango_chip(chip);
-
- writel_relaxed(tchip->timing1, nfc->reg_base + NFC_TIMING1);
- writel_relaxed(tchip->timing2, nfc->reg_base + NFC_TIMING2);
- writel_relaxed(tchip->xfer_cfg, nfc->reg_base + NFC_XFER_CFG);
- writel_relaxed(tchip->pkt_0_cfg, nfc->reg_base + NFC_PKT_0_CFG);
- writel_relaxed(tchip->pkt_n_cfg, nfc->reg_base + NFC_PKT_N_CFG);
- writel_relaxed(tchip->bb_cfg, nfc->reg_base + NFC_BB_CFG);
-}
-
-static int tango_waitrdy(struct nand_chip *chip, unsigned int timeout_ms)
-{
- struct tango_nfc *nfc = to_tango_nfc(chip->controller);
- u32 status;
-
- return readl_relaxed_poll_timeout(nfc->pbus_base + PBUS_CS_CTRL,
- status, status & PBUS_IORDY, 20,
- timeout_ms);
-}
-
-static int tango_exec_instr(struct nand_chip *chip,
- const struct nand_op_instr *instr)
-{
- struct tango_chip *tchip = to_tango_chip(chip);
- unsigned int i;
-
- switch (instr->type) {
- case NAND_OP_CMD_INSTR:
- writeb_relaxed(instr->ctx.cmd.opcode, tchip->base + PBUS_CMD);
- return 0;
- case NAND_OP_ADDR_INSTR:
- for (i = 0; i < instr->ctx.addr.naddrs; i++)
- writeb_relaxed(instr->ctx.addr.addrs[i],
- tchip->base + PBUS_ADDR);
- return 0;
- case NAND_OP_DATA_IN_INSTR:
- ioread8_rep(tchip->base + PBUS_DATA, instr->ctx.data.buf.in,
- instr->ctx.data.len);
- return 0;
- case NAND_OP_DATA_OUT_INSTR:
- iowrite8_rep(tchip->base + PBUS_DATA, instr->ctx.data.buf.out,
- instr->ctx.data.len);
- return 0;
- case NAND_OP_WAITRDY_INSTR:
- return tango_waitrdy(chip,
- instr->ctx.waitrdy.timeout_ms);
- default:
- break;
- }
-
- return -EINVAL;
-}
-
-static int tango_exec_op(struct nand_chip *chip,
- const struct nand_operation *op,
- bool check_only)
-{
- unsigned int i;
- int ret = 0;
-
- if (check_only)
- return 0;
-
- tango_select_target(chip, op->cs);
- for (i = 0; i < op->ninstrs; i++) {
- ret = tango_exec_instr(chip, &op->instrs[i]);
- if (ret)
- break;
- }
-
- return ret;
-}
-
-/*
- * The controller does not check for bitflips in erased pages,
- * therefore software must check instead.
- */
-static int check_erased_page(struct nand_chip *chip, u8 *buf)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- u8 *meta = chip->oob_poi + BBM_SIZE;
- u8 *ecc = chip->oob_poi + BBM_SIZE + METADATA_SIZE;
- const int ecc_size = chip->ecc.bytes;
- const int pkt_size = chip->ecc.size;
- int i, res, meta_len, bitflips = 0;
-
- for (i = 0; i < chip->ecc.steps; ++i) {
- meta_len = i ? 0 : METADATA_SIZE;
- res = nand_check_erased_ecc_chunk(buf, pkt_size, ecc, ecc_size,
- meta, meta_len,
- chip->ecc.strength);
- if (res < 0)
- mtd->ecc_stats.failed++;
- else
- mtd->ecc_stats.corrected += res;
-
- bitflips = max(res, bitflips);
- buf += pkt_size;
- ecc += ecc_size;
- }
-
- return bitflips;
-}
-
-static int decode_error_report(struct nand_chip *chip)
-{
- u32 status, res;
- struct mtd_info *mtd = nand_to_mtd(chip);
- struct tango_nfc *nfc = to_tango_nfc(chip->controller);
-
- status = readl_relaxed(nfc->reg_base + NFC_XFER_STATUS);
- if (status & PAGE_IS_EMPTY)
- return 0;
-
- res = readl_relaxed(nfc->mem_base + ERROR_REPORT);
-
- if (DECODE_FAIL_PKT_0(res) || DECODE_FAIL_PKT_N(res))
- return -EBADMSG;
-
- /* ERR_COUNT_PKT_N is max, not sum, but that's all we have */
- mtd->ecc_stats.corrected +=
- ERR_COUNT_PKT_0(res) + ERR_COUNT_PKT_N(res);
-
- return max(ERR_COUNT_PKT_0(res), ERR_COUNT_PKT_N(res));
-}
-
-static void tango_dma_callback(void *arg)
-{
- complete(arg);
-}
-
-static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
- const void *buf, int len, int page)
-{
- void __iomem *addr = nfc->reg_base + NFC_STATUS;
- struct dma_chan *chan = nfc->chan;
- struct dma_async_tx_descriptor *desc;
- enum dma_transfer_direction tdir;
- struct scatterlist sg;
- struct completion tx_done;
- int err = -EIO;
- u32 res, val;
-
- sg_init_one(&sg, buf, len);
- if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
- return -EIO;
-
- tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT);
- if (!desc)
- goto dma_unmap;
-
- desc->callback = tango_dma_callback;
- desc->callback_param = &tx_done;
- init_completion(&tx_done);
-
- writel_relaxed(MODE_NFC, nfc->pbus_base + PBUS_PAD_MODE);
-
- writel_relaxed(page, nfc->reg_base + NFC_ADDR_PAGE);
- writel_relaxed(0, nfc->reg_base + NFC_ADDR_OFFSET);
- writel_relaxed(cmd, nfc->reg_base + NFC_FLASH_CMD);
-
- dmaengine_submit(desc);
- dma_async_issue_pending(chan);
-
- res = wait_for_completion_timeout(&tx_done, HZ);
- if (res > 0)
- err = readl_poll_timeout(addr, val, val & CMD_READY, 0, 1000);
-
- writel_relaxed(MODE_RAW, nfc->pbus_base + PBUS_PAD_MODE);
-
-dma_unmap:
- dma_unmap_sg(chan->device->dev, &sg, 1, dir);
-
- return err;
-}
-
-static int tango_read_page(struct nand_chip *chip, u8 *buf,
- int oob_required, int page)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- struct tango_nfc *nfc = to_tango_nfc(chip->controller);
- int err, res, len = mtd->writesize;
-
- tango_select_target(chip, chip->cur_cs);
- if (oob_required)
- chip->ecc.read_oob(chip, page);
-
- err = do_dma(nfc, DMA_FROM_DEVICE, NFC_READ, buf, len, page);
- if (err)
- return err;
-
- res = decode_error_report(chip);
- if (res < 0) {
- chip->ecc.read_oob_raw(chip, page);
- res = check_erased_page(chip, buf);
- }
-
- return res;
-}
-
-static int tango_write_page(struct nand_chip *chip, const u8 *buf,
- int oob_required, int page)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- struct tango_nfc *nfc = to_tango_nfc(chip->controller);
- const struct nand_sdr_timings *timings;
- int err, len = mtd->writesize;
- u8 status;
-
- /* Calling tango_write_oob() would send PAGEPROG twice */
- if (oob_required)
- return -ENOTSUPP;
-
- tango_select_target(chip, chip->cur_cs);
- writel_relaxed(0xffffffff, nfc->mem_base + METADATA);
- err = do_dma(nfc, DMA_TO_DEVICE, NFC_WRITE, buf, len, page);
- if (err)
- return err;
-
- timings = nand_get_sdr_timings(nand_get_interface_config(chip));
- err = tango_waitrdy(chip, PSEC_TO_MSEC(timings->tR_max));
- if (err)
- return err;
-
- err = nand_status_op(chip, &status);
- if (err)
- return err;
-
- return (status & NAND_STATUS_FAIL) ? -EIO : 0;
-}
-
-static void aux_read(struct nand_chip *chip, u8 **buf, int len, int *pos)
-{
- *pos += len;
-
- if (!*buf) {
- /* skip over "len" bytes */
- nand_change_read_column_op(chip, *pos, NULL, 0, false);
- } else {
- struct tango_chip *tchip = to_tango_chip(chip);
-
- ioread8_rep(tchip->base + PBUS_DATA, *buf, len);
- *buf += len;
- }
-}
-
-static void aux_write(struct nand_chip *chip, const u8 **buf, int len, int *pos)
-{
- *pos += len;
-
- if (!*buf) {
- /* skip over "len" bytes */
- nand_change_write_column_op(chip, *pos, NULL, 0, false);
- } else {
- struct tango_chip *tchip = to_tango_chip(chip);
-
- iowrite8_rep(tchip->base + PBUS_DATA, *buf, len);
- *buf += len;
- }
-}
-
-/*
- * Physical page layout (not drawn to scale)
- *
- * NB: Bad Block Marker area splits PKT_N in two (N1, N2).
- *
- * +---+-----------------+-------+-----+-----------+-----+----+-------+
- * | M | PKT_0 | ECC_0 | ... | N1 | BBM | N2 | ECC_N |
- * +---+-----------------+-------+-----+-----------+-----+----+-------+
- *
- * Logical page layout:
- *
- * +-----+---+-------+-----+-------+
- * oob = | BBM | M | ECC_0 | ... | ECC_N |
- * +-----+---+-------+-----+-------+
- *
- * +-----------------+-----+-----------------+
- * buf = | PKT_0 | ... | PKT_N |
- * +-----------------+-----+-----------------+
- */
-static void raw_read(struct nand_chip *chip, u8 *buf, u8 *oob)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- u8 *oob_orig = oob;
- const int page_size = mtd->writesize;
- const int ecc_size = chip->ecc.bytes;
- const int pkt_size = chip->ecc.size;
- int pos = 0; /* position within physical page */
- int rem = page_size; /* bytes remaining until BBM area */
-
- if (oob)
- oob += BBM_SIZE;
-
- aux_read(chip, &oob, METADATA_SIZE, &pos);
-
- while (rem > pkt_size) {
- aux_read(chip, &buf, pkt_size, &pos);
- aux_read(chip, &oob, ecc_size, &pos);
- rem = page_size - pos;
- }
-
- aux_read(chip, &buf, rem, &pos);
- aux_read(chip, &oob_orig, BBM_SIZE, &pos);
- aux_read(chip, &buf, pkt_size - rem, &pos);
- aux_read(chip, &oob, ecc_size, &pos);
-}
-
-static void raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob)
-{
- struct mtd_info *mtd = nand_to_mtd(chip);
- const u8 *oob_orig = oob;
- const int page_size = mtd->writesize;
- const int ecc_size = chip->ecc.bytes;
- const int pkt_size = chip->ecc.size;
- int pos = 0; /* position within physical page */
- int rem = page_size; /* bytes remaining until BBM area */
-
- if (oob)
- oob += BBM_SIZE;
-
- aux_write(chip, &oob, METADATA_SIZE, &pos);
-
- while (rem > pkt_size) {
- aux_write(chip, &buf, pkt_size, &pos);
- aux_write(chip, &oob, ecc_size, &pos);
- rem = page_size - pos;
- }
-
- aux_write(chip, &buf, rem, &pos);
- aux_write(chip, &oob_orig, BBM_SIZE, &pos);
- aux_write(chip, &buf, pkt_size - rem, &pos);
- aux_write(chip, &oob, ecc_size, &pos);
-}
-
-static int tango_read_page_raw(struct nand_chip *chip, u8 *buf,
- int oob_required, int page)
-{
- tango_select_target(chip, chip->cur_cs);
- nand_read_page_op(chip, page, 0, NULL, 0);
- raw_read(chip, buf, chip->oob_poi);
- return 0;
-}
-
-static int tango_write_page_raw(struct nand_chip *chip, const u8 *buf,
- int oob_required, int page)
-{
- tango_select_target(chip, chip->cur_cs);
- nand_prog_page_begin_op(chip, page, 0, NULL, 0);
- raw_write(chip, buf, chip->oob_poi);
- return nand_prog_page_end_op(chip);
-}
-
-static int tango_read_oob(struct nand_chip *chip, int page)
-{
- tango_select_target(chip, chip->cur_cs);
- nand_read_page_op(chip, page, 0, NULL, 0);
- raw_read(chip, NULL, chip->oob_poi);
- return 0;
-}
-
-static int tango_write_oob(struct nand_chip *chip, int page)
-{
- tango_select_target(chip, chip->cur_cs);
- nand_prog_page_begin_op(chip, page, 0, NULL, 0);
- raw_write(chip, NULL, chip->oob_poi);
- return nand_prog_page_end_op(chip);
-}
-
-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 nand_chip *chip, int csline,
- const struct nand_interface_config *conf)
-{
- const struct nand_sdr_timings *sdr = nand_get_sdr_timings(conf);
- 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 (csline == NAND_DATA_IFACE_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 tango_attach_chip(struct nand_chip *chip)
-{
- struct nand_ecc_ctrl *ecc = &chip->ecc;
-
- ecc->engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
- ecc->algo = NAND_ECC_ALGO_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;
-
- return 0;
-}
-
-static const struct nand_controller_ops tango_controller_ops = {
- .attach_chip = tango_attach_chip,
- .setup_interface = tango_set_timings,
- .exec_op = tango_exec_op,
-};
-
-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 = nand_to_mtd(chip);
-
- chip->options = NAND_USES_DMA |
- 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(chip, 1);
- 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) {
- nand_cleanup(chip);
- return err;
- }
-
- nfc->chips[cs] = tchip;
-
- return 0;
-}
-
-static int tango_nand_remove(struct platform_device *pdev)
-{
- struct tango_nfc *nfc = platform_get_drvdata(pdev);
- struct nand_chip *chip;
- int cs, ret;
-
- dma_release_channel(nfc->chan);
-
- for (cs = 0; cs < MAX_CS; ++cs) {
- if (nfc->chips[cs]) {
- chip = &nfc->chips[cs]->nand_chip;
- ret = mtd_device_unregister(nand_to_mtd(chip));
- WARN_ON(ret);
- nand_cleanup(chip);
- }
- }
-
- 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);
-
- writel_relaxed(MODE_RAW, nfc->pbus_base + PBUS_PAD_MODE);
-
- clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
-
- nfc->chan = dma_request_chan(&pdev->dev, "rxtx");
- if (IS_ERR(nfc->chan))
- return PTR_ERR(nfc->chan);
-
- platform_set_drvdata(pdev, nfc);
- nand_controller_init(&nfc->hw);
- nfc->hw.ops = &tango_controller_ops;
- 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);
- of_node_put(np);
- return err;
- }
- }
-
- return 0;
-}
-
-static const struct of_device_id tango_nand_ids[] = {
- { .compatible = "sigma,smp8758-nand" },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, tango_nand_ids);
-
-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");
projects / platform / kernel / linux-starfive.git / commitdiff