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Subject[RESEND PATCH 2/5] mtd: rawnand: add NVIDIA Tegra NAND Flash controller driver
Date
Add support for the NAND flash controller found on NVIDIA
Tegra 2 SoCs. This implementation does not make use of the
command queue feature. Regular operations/data transfers are
done in PIO mode. Page read/writes with hardware ECC make
use of the DMA for data transfer.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
MAINTAINERS | 7 +
drivers/mtd/nand/raw/Kconfig | 6 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/tegra_nand.c | 915 ++++++++++++++++++++++++++++++
4 files changed, 929 insertions(+)
create mode 100644 drivers/mtd/nand/raw/tegra_nand.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 58b9861ccf99..a65739681279 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13844,6 +13844,13 @@ M: Laxman Dewangan <ldewangan@nvidia.com>
S: Supported
F: drivers/input/keyboard/tegra-kbc.c

+TEGRA NAND DRIVER
+M: Stefan Agner <stefan@agner.ch>
+M: Lucas Stach <dev@lynxeye.de>
+S: Maintained
+F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
+F: drivers/mtd/nand/tegra_nand.c
+
TEGRA PWM DRIVER
M: Thierry Reding <thierry.reding@gmail.com>
S: Supported
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 19a2b283fbbe..bd56264233ca 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -534,4 +534,10 @@ config MTD_NAND_MTK
Enables support for NAND controller on MTK SoCs.
This controller is found on mt27xx, mt81xx, mt65xx SoCs.

+config MTD_NAND_TEGRA
+ tristate "Support for NAND on NVIDIA Tegra"
+ depends on ARCH_TEGRA
+ help
+ Enables support for NAND flash on NVIDIA Tegra SoC based boards.
+
endif # MTD_NAND
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index 165b7ef9e9a1..d5a5f9832b88 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
+obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o

nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
nand-objs += nand_amd.o
diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
new file mode 100644
index 000000000000..fa236e683fb8
--- /dev/null
+++ b/drivers/mtd/nand/raw/tegra_nand.c
@@ -0,0 +1,915 @@
+/*
+ * Copyright (C) 2018 Stefan Agner <stefan@agner.ch>
+ * Copyright (C) 2014-2015 Lucas Stach <dev@lynxeye.de>
+ * Copyright (C) 2012 Avionic Design GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define CMD 0x00
+#define CMD_GO (1 << 31)
+#define CMD_CLE (1 << 30)
+#define CMD_ALE (1 << 29)
+#define CMD_PIO (1 << 28)
+#define CMD_TX (1 << 27)
+#define CMD_RX (1 << 26)
+#define CMD_SEC_CMD (1 << 25)
+#define CMD_AFT_DAT (1 << 24)
+#define CMD_TRANS_SIZE(x) (((x - 1) & 0xf) << 20)
+#define CMD_A_VALID (1 << 19)
+#define CMD_B_VALID (1 << 18)
+#define CMD_RD_STATUS_CHK (1 << 17)
+#define CMD_RBSY_CHK (1 << 16)
+#define CMD_CE(x) (1 << (8 + ((x) & 0x7)))
+#define CMD_CLE_SIZE(x) (((x - 1) & 0x3) << 4)
+#define CMD_ALE_SIZE(x) (((x - 1) & 0xf) << 0)
+
+#define STATUS 0x04
+
+#define ISR 0x08
+#define ISR_CORRFAIL_ERR (1 << 24)
+#define ISR_UND (1 << 7)
+#define ISR_OVR (1 << 6)
+#define ISR_CMD_DONE (1 << 5)
+#define ISR_ECC_ERR (1 << 4)
+
+#define IER 0x0c
+#define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16)
+#define IER_UND (1 << 7)
+#define IER_OVR (1 << 6)
+#define IER_CMD_DONE (1 << 5)
+#define IER_ECC_ERR (1 << 4)
+#define IER_GIE (1 << 0)
+
+#define CFG 0x10
+#define CFG_HW_ECC (1 << 31)
+#define CFG_ECC_SEL (1 << 30)
+#define CFG_ERR_COR (1 << 29)
+#define CFG_PIPE_EN (1 << 28)
+#define CFG_TVAL_4 (0 << 24)
+#define CFG_TVAL_6 (1 << 24)
+#define CFG_TVAL_8 (2 << 24)
+#define CFG_SKIP_SPARE (1 << 23)
+#define CFG_BUS_WIDTH_8 (0 << 21)
+#define CFG_BUS_WIDTH_16 (1 << 21)
+#define CFG_COM_BSY (1 << 20)
+#define CFG_PS_256 (0 << 16)
+#define CFG_PS_512 (1 << 16)
+#define CFG_PS_1024 (2 << 16)
+#define CFG_PS_2048 (3 << 16)
+#define CFG_PS_4096 (4 << 16)
+#define CFG_SKIP_SPARE_SIZE_4 (0 << 14)
+#define CFG_SKIP_SPARE_SIZE_8 (1 << 14)
+#define CFG_SKIP_SPARE_SIZE_12 (2 << 14)
+#define CFG_SKIP_SPARE_SIZE_16 (3 << 14)
+#define CFG_TAG_BYTE_SIZE(x) ((x) & 0xff)
+
+#define TIMING_1 0x14
+#define TIMING_TRP_RESP(x) (((x) & 0xf) << 28)
+#define TIMING_TWB(x) (((x) & 0xf) << 24)
+#define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20)
+#define TIMING_TWHR(x) (((x) & 0xf) << 16)
+#define TIMING_TCS(x) (((x) & 0x3) << 14)
+#define TIMING_TWH(x) (((x) & 0x3) << 12)
+#define TIMING_TWP(x) (((x) & 0xf) << 8)
+#define TIMING_TRH(x) (((x) & 0xf) << 4)
+#define TIMING_TRP(x) (((x) & 0xf) << 0)
+
+#define RESP 0x18
+
+#define TIMING_2 0x1c
+#define TIMING_TADL(x) ((x) & 0xf)
+
+#define CMD_1 0x20
+#define CMD_2 0x24
+#define ADDR_1 0x28
+#define ADDR_2 0x2c
+
+#define DMA_CTRL 0x30
+#define DMA_CTRL_GO (1 << 31)
+#define DMA_CTRL_IN (0 << 30)
+#define DMA_CTRL_OUT (1 << 30)
+#define DMA_CTRL_PERF_EN (1 << 29)
+#define DMA_CTRL_IE_DONE (1 << 28)
+#define DMA_CTRL_REUSE (1 << 27)
+#define DMA_CTRL_BURST_1 (2 << 24)
+#define DMA_CTRL_BURST_4 (3 << 24)
+#define DMA_CTRL_BURST_8 (4 << 24)
+#define DMA_CTRL_BURST_16 (5 << 24)
+#define DMA_CTRL_IS_DONE (1 << 20)
+#define DMA_CTRL_EN_A (1 << 2)
+#define DMA_CTRL_EN_B (1 << 1)
+
+#define DMA_CFG_A 0x34
+#define DMA_CFG_B 0x38
+
+#define FIFO_CTRL 0x3c
+#define FIFO_CTRL_CLR_ALL (1 << 3)
+
+#define DATA_PTR 0x40
+#define TAG_PTR 0x44
+#define ECC_PTR 0x48
+
+#define DEC_STATUS 0x4c
+#define DEC_STATUS_A_ECC_FAIL (1 << 1)
+#define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000
+#define DEC_STATUS_ERR_COUNT_SHIFT 16
+
+#define HWSTATUS_CMD 0x50
+#define HWSTATUS_MASK 0x54
+#define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24)
+#define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16)
+#define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8)
+#define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0)
+
+#define DEC_STAT_RESULT 0xd0
+#define DEC_STAT_BUF 0xd4
+#define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000
+#define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16
+#define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00
+#define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8
+
+struct tegra_nand {
+ void __iomem *regs;
+ struct clk *clk;
+ struct gpio_desc *wp_gpio;
+
+ struct nand_chip chip;
+ struct device *dev;
+
+ struct completion command_complete;
+ struct completion dma_complete;
+ bool last_read_error;
+
+ dma_addr_t data_dma;
+ void *data_buf;
+ dma_addr_t oob_dma;
+ void *oob_buf;
+
+ int cur_chip;
+};
+
+static inline struct tegra_nand *to_tegra_nand(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ return nand_get_controller_data(chip);
+}
+
+static int tegra_nand_ooblayout_16_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 4;
+ oobregion->length = 4;
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_16_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 8;
+ oobregion->length = 8;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops tegra_nand_oob_16_ops = {
+ .ecc = tegra_nand_ooblayout_16_ecc,
+ .free = tegra_nand_ooblayout_16_free,
+};
+
+static int tegra_nand_ooblayout_64_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 4;
+ oobregion->length = 36;
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_64_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 40;
+ oobregion->length = 24;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops tegra_nand_oob_64_ops = {
+ .ecc = tegra_nand_ooblayout_64_ecc,
+ .free = tegra_nand_ooblayout_64_free,
+};
+
+static int tegra_nand_ooblayout_128_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 4;
+ oobregion->length = 72;
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_128_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 76;
+ oobregion->length = 52;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops tegra_nand_oob_128_ops = {
+ .ecc = tegra_nand_ooblayout_128_ecc,
+ .free = tegra_nand_ooblayout_128_free,
+};
+
+static int tegra_nand_ooblayout_224_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 4;
+ oobregion->length = 144;
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_224_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = 148;
+ oobregion->length = 76;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops tegra_nand_oob_224_ops = {
+ .ecc = tegra_nand_ooblayout_224_ecc,
+ .free = tegra_nand_ooblayout_224_free,
+};
+
+static irqreturn_t tegra_nand_irq(int irq, void *data)
+{
+ struct tegra_nand *nand = data;
+ u32 isr, dma;
+
+ isr = readl(nand->regs + ISR);
+ dma = readl(nand->regs + DMA_CTRL);
+ dev_dbg(nand->dev, "isr %08x\n", isr);
+
+ if (!isr && !(dma & DMA_CTRL_IS_DONE))
+ return IRQ_NONE;
+
+ if (isr & ISR_CORRFAIL_ERR)
+ nand->last_read_error = true;
+
+ if (isr & ISR_CMD_DONE)
+ complete(&nand->command_complete);
+
+ if (isr & ISR_UND)
+ dev_dbg(nand->dev, "FIFO underrun\n");
+
+ if (isr & ISR_OVR)
+ dev_dbg(nand->dev, "FIFO overrun\n");
+
+ /* handle DMA interrupts */
+ if (dma & DMA_CTRL_IS_DONE) {
+ writel(dma, nand->regs + DMA_CTRL);
+ complete(&nand->dma_complete);
+ }
+
+ /* clear interrupts */
+ writel(isr, nand->regs + ISR);
+
+ return IRQ_HANDLED;
+}
+
+static int tegra_nand_cmd(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ const struct nand_op_instr *instr;
+ const struct nand_op_instr *instr_data_in = NULL;
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ unsigned int op_id = -1, trfr_in_sz = 0, trfr_out_sz = 0, offset = 0;
+ bool first_cmd = true;
+ bool force8bit;
+ u32 cmd = 0;
+ u32 value;
+
+ for (op_id = 0; op_id < subop->ninstrs; op_id++) {
+ unsigned int naddrs, i;
+ const u8 *addrs;
+ u32 addr1 = 0, addr2 = 0;
+
+ instr = &subop->instrs[op_id];
+
+ switch (instr->type) {
+ case NAND_OP_CMD_INSTR:
+ if (first_cmd) {
+ cmd |= CMD_CLE;
+ writel(instr->ctx.cmd.opcode, nand->regs + CMD_1);
+ } else {
+ cmd |= CMD_SEC_CMD;
+ writel(instr->ctx.cmd.opcode, nand->regs + CMD_2);
+ }
+ first_cmd = false;
+ break;
+ case NAND_OP_ADDR_INSTR:
+ offset = nand_subop_get_addr_start_off(subop, op_id);
+ naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
+ addrs = &instr->ctx.addr.addrs[offset];
+
+ cmd |= CMD_ALE | CMD_ALE_SIZE(naddrs);
+ for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
+ addr1 |= *addrs++ << (8 * i);
+ naddrs -= i;
+ for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
+ addr2 |= *addrs++ << (8 * i);
+ writel(addr1, nand->regs + ADDR_1);
+ writel(addr2, nand->regs + ADDR_2);
+ break;
+
+ case NAND_OP_DATA_IN_INSTR:
+ trfr_in_sz = nand_subop_get_data_len(subop, op_id);
+ offset = nand_subop_get_data_start_off(subop, op_id);
+
+ cmd |= CMD_TRANS_SIZE(trfr_in_sz) | CMD_PIO | CMD_RX | CMD_A_VALID;
+
+ instr_data_in = instr;
+ break;
+
+ case NAND_OP_DATA_OUT_INSTR:
+ trfr_out_sz = nand_subop_get_data_len(subop, op_id);
+ offset = nand_subop_get_data_start_off(subop, op_id);
+ trfr_out_sz = min_t(size_t, trfr_out_sz, 4);
+
+ cmd |= CMD_TRANS_SIZE(trfr_out_sz) | CMD_PIO | CMD_TX | CMD_A_VALID;
+
+ memcpy(&value, instr->ctx.data.buf.out + offset, trfr_out_sz);
+ writel(value, nand->regs + RESP);
+
+ break;
+ case NAND_OP_WAITRDY_INSTR:
+ cmd |= CMD_RBSY_CHK;
+ break;
+
+ }
+ }
+
+
+ cmd |= CMD_GO | CMD_CE(nand->cur_chip);
+ writel(cmd, nand->regs + CMD);
+ wait_for_completion(&nand->command_complete);
+
+ if (instr_data_in) {
+ u32 value;
+ size_t n = min_t(size_t, trfr_in_sz, 4);
+
+ value = readl(nand->regs + RESP);
+ memcpy(instr_data_in->ctx.data.buf.in + offset, &value, n);
+ }
+
+ return 0;
+}
+
+static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER(
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)),
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
+ NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)),
+ );
+
+static int tegra_nand_exec_op(struct nand_chip *chip,
+ const struct nand_operation *op,
+ bool check_only)
+{
+ return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op,
+ check_only);
+}
+static void tegra_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+
+ nand->cur_chip = chip;
+}
+
+static u32 tegra_nand_fill_address(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+
+ /* Lower 16-bits are column, always 0 */
+ writel(page << 16, nand->regs + ADDR_1);
+
+ if (chip->options & NAND_ROW_ADDR_3) {
+ writel(page >> 16, nand->regs + ADDR_2);
+ return 5;
+ }
+
+ return 4;
+}
+
+static int tegra_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ u32 value, addrs;
+
+ writel(NAND_CMD_READ0, nand->regs + CMD_1);
+ writel(NAND_CMD_READSTART, nand->regs + CMD_2);
+
+ addrs = tegra_nand_fill_address(mtd, chip, page);
+
+ value = readl(nand->regs + CFG);
+ value |= CFG_HW_ECC | CFG_ERR_COR;
+ writel(value, nand->regs + CFG);
+
+ writel(mtd->writesize - 1, nand->regs + DMA_CFG_A);
+ writel(nand->data_dma, nand->regs + DATA_PTR);
+
+ if (oob_required) {
+ writel(mtd_ooblayout_count_freebytes(mtd) - 1,
+ nand->regs + DMA_CFG_B);
+ writel(nand->oob_dma, nand->regs + TAG_PTR);
+ } else {
+ writel(0, nand->regs + DMA_CFG_B);
+ writel(0, nand->regs + TAG_PTR);
+ }
+
+ value = DMA_CTRL_GO | DMA_CTRL_IN | DMA_CTRL_PERF_EN |
+ DMA_CTRL_REUSE | DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
+ DMA_CTRL_BURST_8 | DMA_CTRL_EN_A;
+ if (oob_required)
+ value |= DMA_CTRL_EN_B;
+ writel(value, nand->regs + DMA_CTRL);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
+ CMD_RBSY_CHK | CMD_GO | CMD_RX | CMD_TRANS_SIZE(9) |
+ CMD_A_VALID | CMD_CE(nand->cur_chip);
+ if (oob_required)
+ value |= CMD_B_VALID;
+ writel(value, nand->regs + CMD);
+
+ wait_for_completion(&nand->command_complete);
+ wait_for_completion(&nand->dma_complete);
+
+ if (oob_required) {
+ struct mtd_oob_region oobregion;
+
+ mtd_ooblayout_free(mtd, 0, &oobregion);
+ memcpy(chip->oob_poi, nand->oob_buf + oobregion.offset,
+ mtd_ooblayout_count_freebytes(mtd));
+ }
+ memcpy(buf, nand->data_buf, mtd->writesize);
+
+ value = readl(nand->regs + CFG);
+ value &= ~(CFG_HW_ECC | CFG_ERR_COR);
+ writel(value, nand->regs + CFG);
+
+ value = readl(nand->regs + DEC_STATUS);
+ if (value & DEC_STATUS_A_ECC_FAIL) {
+ /*
+ * The ECC isn't smart enough to figure out if a page is
+ * completely erased and flags an error in this case. So we
+ * check the read data here to figure out if it's a legitimate
+ * error or a false positive.
+ */
+ int i, err;
+ int flips_threshold = chip->ecc.strength / 2;
+ int max_bitflips = 0;
+
+ for (i = 0; i < chip->ecc.steps; i++) {
+ u8 *data = buf + (chip->ecc.size * i);
+ err = nand_check_erased_ecc_chunk(data, chip->ecc.size,
+ NULL, 0,
+ NULL, 0,
+ flips_threshold);
+ if (err < 0)
+ return err;
+
+ max_bitflips += max_bitflips;
+ }
+
+ return max_bitflips;
+ }
+
+ if (nand->last_read_error) {
+ int max_corr_cnt, corr_sec_flag;
+
+ value = readl(nand->regs + DEC_STAT_BUF);
+ corr_sec_flag = (value & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >>
+ DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT;
+ max_corr_cnt = (value & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >>
+ DEC_STAT_BUF_MAX_CORR_CNT_SHIFT;
+
+ /*
+ * The value returned in the register is the maximum of
+ * bitflips encountered in any of the ECC regions. As there is
+ * no way to get the number of bitflips in a specific regions
+ * we are not able to deliver correct stats but instead
+ * overestimate the number of corrected bitflips by assuming
+ * that all regions where errors have been corrected
+ * encountered the maximum number of bitflips.
+ */
+ mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag);
+ nand->last_read_error = false;
+ return value;
+ }
+
+ return 0;
+}
+
+static int tegra_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_required, int page)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ u32 value, addrs;
+
+ writel(NAND_CMD_SEQIN, nand->regs + CMD_1);
+ writel(NAND_CMD_PAGEPROG, nand->regs + CMD_2);
+
+ addrs = tegra_nand_fill_address(mtd, chip, page);
+
+ value = readl(nand->regs + CFG);
+ value |= CFG_HW_ECC | CFG_ERR_COR;
+ writel(value, nand->regs + CFG);
+
+ memcpy(nand->data_buf, buf, mtd->writesize);
+
+ writel(mtd->writesize - 1, nand->regs + DMA_CFG_A);
+ writel(nand->data_dma, nand->regs + DATA_PTR);
+
+ if (oob_required) {
+ struct mtd_oob_region oobregion;
+
+ mtd_ooblayout_free(mtd, 0, &oobregion);
+ memcpy(nand->oob_buf, chip->oob_poi + oobregion.offset,
+ mtd_ooblayout_count_freebytes(mtd));
+ writel(mtd_ooblayout_count_freebytes(mtd) - 1,
+ nand->regs + DMA_CFG_B);
+ writel(nand->oob_dma, nand->regs + TAG_PTR);
+ } else {
+ writel(0, nand->regs + DMA_CFG_B);
+ writel(0, nand->regs + TAG_PTR);
+ }
+
+ value = DMA_CTRL_GO | DMA_CTRL_OUT | DMA_CTRL_PERF_EN |
+ DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
+ DMA_CTRL_BURST_8 | DMA_CTRL_EN_A;
+ if (oob_required)
+ value |= DMA_CTRL_EN_B;
+ writel(value, nand->regs + DMA_CTRL);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
+ CMD_AFT_DAT | CMD_RBSY_CHK | CMD_GO | CMD_TX | CMD_A_VALID |
+ CMD_TRANS_SIZE(9) | CMD_CE(nand->cur_chip);
+ if (oob_required)
+ value |= CMD_B_VALID;
+ writel(value, nand->regs + CMD);
+
+ wait_for_completion(&nand->command_complete);
+ wait_for_completion(&nand->dma_complete);
+
+ value = readl(nand->regs + CFG);
+ value &= ~(CFG_HW_ECC | CFG_ERR_COR);
+ writel(value, nand->regs + CFG);
+
+ return 0;
+}
+
+static void tegra_nand_setup_timing(struct tegra_nand *nand, int mode)
+{
+ /*
+ * The period (and all other timings in this function) is in ps,
+ * so need to take care here to avoid integer overflows.
+ */
+ unsigned int rate = clk_get_rate(nand->clk) / 1000000;
+ unsigned int period = DIV_ROUND_UP(1000000, rate);
+ const struct nand_sdr_timings *timings;
+ u32 val, reg = 0;
+
+ timings = onfi_async_timing_mode_to_sdr_timings(mode);
+
+ val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min,
+ timings->tRC_min), period);
+ if (val > 2)
+ val -= 3;
+ reg |= TIMING_TCR_TAR_TRR(val);
+
+ val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min),
+ max(timings->tALS_min, timings->tALH_min)),
+ period);
+ if (val > 1)
+ val -= 2;
+ reg |= TIMING_TCS(val);
+
+ val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000,
+ period);
+ reg |= TIMING_TRP(val) | TIMING_TRP_RESP(val);
+
+ reg |= TIMING_TWB(DIV_ROUND_UP(timings->tWB_max, period));
+ reg |= TIMING_TWHR(DIV_ROUND_UP(timings->tWHR_min, period));
+ reg |= TIMING_TWH(DIV_ROUND_UP(timings->tWH_min, period));
+ reg |= TIMING_TWP(DIV_ROUND_UP(timings->tWP_min, period));
+ reg |= TIMING_TRH(DIV_ROUND_UP(timings->tRHW_min, period));
+
+ writel(reg, nand->regs + TIMING_1);
+
+ val = DIV_ROUND_UP(timings->tADL_min, period);
+ if (val > 2)
+ val -= 3;
+ reg = TIMING_TADL(val);
+
+ writel(reg, nand->regs + TIMING_2);
+}
+
+static void tegra_nand_setup_chiptiming(struct tegra_nand *nand)
+{
+ struct nand_chip *chip = &nand->chip;
+ int mode;
+
+ mode = onfi_get_async_timing_mode(chip);
+ if (mode == ONFI_TIMING_MODE_UNKNOWN)
+ mode = chip->onfi_timing_mode_default;
+ else
+ mode = fls(mode);
+
+ tegra_nand_setup_timing(nand, mode);
+}
+
+static int tegra_nand_probe(struct platform_device *pdev)
+{
+ struct reset_control *rst;
+ struct tegra_nand *nand;
+ struct nand_chip *chip;
+ struct mtd_info *mtd;
+ struct resource *res;
+ unsigned long value;
+ int irq, err = 0;
+
+ nand = devm_kzalloc(&pdev->dev, sizeof(*nand), GFP_KERNEL);
+ if (!nand)
+ return -ENOMEM;
+
+ nand->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ nand->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(nand->regs))
+ return PTR_ERR(nand->regs);
+
+ irq = platform_get_irq(pdev, 0);
+ err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
+ dev_name(&pdev->dev), nand);
+ if (err)
+ return err;
+
+ rst = devm_reset_control_get(&pdev->dev, "nand");
+ if (IS_ERR(rst))
+ return PTR_ERR(rst);
+
+ nand->clk = devm_clk_get(&pdev->dev, "nand");
+ if (IS_ERR(nand->clk))
+ return PTR_ERR(nand->clk);
+
+ nand->wp_gpio = gpiod_get_optional(&pdev->dev, "wp-gpios",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(nand->wp_gpio))
+ return PTR_ERR(nand->wp_gpio);
+
+ err = clk_prepare_enable(nand->clk);
+ if (err)
+ return err;
+
+ reset_control_assert(rst);
+ udelay(2);
+ reset_control_deassert(rst);
+
+ value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
+ HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
+ HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
+ writel(NAND_CMD_STATUS, nand->regs + HWSTATUS_CMD);
+ writel(value, nand->regs + HWSTATUS_MASK);
+
+ init_completion(&nand->command_complete);
+ init_completion(&nand->dma_complete);
+
+ /* clear interrupts */
+ value = readl(nand->regs + ISR);
+ writel(value, nand->regs + ISR);
+
+ writel(DMA_CTRL_IS_DONE, nand->regs + DMA_CTRL);
+
+ /* enable interrupts */
+ value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
+ writel(value, nand->regs + IER);
+
+ /* reset config */
+ writel(0, nand->regs + CFG);
+
+ chip = &nand->chip;
+ mtd = nand_to_mtd(chip);
+
+ mtd->dev.parent = &pdev->dev;
+ mtd->name = "tegra_nand";
+ mtd->owner = THIS_MODULE;
+
+ nand_set_flash_node(chip, pdev->dev.of_node);
+ nand_set_controller_data(chip, nand);
+
+ chip->options = NAND_NO_SUBPAGE_WRITE;
+ chip->exec_op = tegra_nand_exec_op;
+ chip->select_chip = tegra_nand_select_chip;
+ tegra_nand_setup_timing(nand, 0);
+
+ err = nand_scan_ident(mtd, 1, NULL);
+ if (err)
+ goto err_disable_clk;
+
+ if (chip->bbt_options & NAND_BBT_USE_FLASH)
+ chip->bbt_options |= NAND_BBT_NO_OOB;
+
+ nand->data_buf = dmam_alloc_coherent(&pdev->dev, mtd->writesize,
+ &nand->data_dma, GFP_KERNEL);
+ if (!nand->data_buf) {
+ err = -ENOMEM;
+ goto err_disable_clk;
+ }
+
+ nand->oob_buf = dmam_alloc_coherent(&pdev->dev, mtd->oobsize,
+ &nand->oob_dma, GFP_KERNEL);
+ if (!nand->oob_buf) {
+ err = -ENOMEM;
+ goto err_disable_clk;
+ }
+
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.read_page = tegra_nand_read_page;
+ chip->ecc.write_page = tegra_nand_write_page;
+
+ value = readl(nand->regs + CFG);
+ value |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4 |
+ CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
+
+ if (chip->options & NAND_BUSWIDTH_16)
+ value |= CFG_BUS_WIDTH_16;
+
+ switch (mtd->oobsize) {
+ case 16:
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_16_ops);
+ chip->ecc.strength = 1;
+ chip->ecc.bytes = 4;
+ break;
+ case 64:
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_64_ops);
+ chip->ecc.strength = 8;
+ chip->ecc.bytes = 18;
+ value |= CFG_ECC_SEL | CFG_TVAL_8;
+ break;
+ case 128:
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_128_ops);
+ chip->ecc.strength = 8;
+ chip->ecc.bytes = 18;
+ value |= CFG_ECC_SEL | CFG_TVAL_8;
+ break;
+ case 224:
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_224_ops);
+ chip->ecc.strength = 8;
+ chip->ecc.bytes = 18;
+ value |= CFG_ECC_SEL | CFG_TVAL_8;
+ break;
+ default:
+ dev_err(&pdev->dev, "unhandled OOB size %d\n", mtd->oobsize);
+ err = -ENODEV;
+ goto err_disable_clk;
+ }
+
+ switch (mtd->writesize) {
+ case 256:
+ value |= CFG_PS_256;
+ break;
+ case 512:
+ value |= CFG_PS_512;
+ break;
+ case 1024:
+ value |= CFG_PS_1024;
+ break;
+ case 2048:
+ value |= CFG_PS_2048;
+ break;
+ case 4096:
+ value |= CFG_PS_4096;
+ break;
+ default:
+ dev_err(&pdev->dev, "unhandled writesize %d\n", mtd->writesize);
+ err = -ENODEV;
+ goto err_disable_clk;
+ }
+
+ writel(value, nand->regs + CFG);
+
+ tegra_nand_setup_chiptiming(nand);
+
+ err = nand_scan_tail(mtd);
+ if (err)
+ goto err_disable_clk;
+
+ err = mtd_device_register(mtd, NULL, 0);
+ if (err)
+ goto err_cleanup_nand;
+
+ platform_set_drvdata(pdev, nand);
+
+ return 0;
+
+err_cleanup_nand:
+ nand_cleanup(chip);
+err_disable_clk:
+ clk_disable_unprepare(nand->clk);
+ return err;
+}
+
+static int tegra_nand_remove(struct platform_device *pdev)
+{
+ struct tegra_nand *nand = platform_get_drvdata(pdev);
+
+ nand_release(nand_to_mtd(&nand->chip));
+
+ clk_disable_unprepare(nand->clk);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_nand_of_match[] = {
+ { .compatible = "nvidia,tegra20-nand" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver tegra_nand_driver = {
+ .driver = {
+ .name = "tegra-nand",
+ .of_match_table = tegra_nand_of_match,
+ },
+ .probe = tegra_nand_probe,
+ .remove = tegra_nand_remove,
+};
+module_platform_driver(tegra_nand_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
+MODULE_AUTHOR("Thierry Reding <thierry.reding@nvidia.com>");
+MODULE_AUTHOR("Lucas Stach <dev@lynxeye.de>");
+MODULE_AUTHOR("Stefan Agner <stefan@agner.ch>");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
--
2.17.0
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