[Patch v3 2/5] mtd: nand: add NVIDIA Tegra NAND Flash controller driver
Lucas Stach
dev at lynxeye.de
Sun May 10 11:29:59 PDT 2015
Add support for the NAND flash controller found on NVIDIA
Tegra 2/3 SoCs.
Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>
Signed-off-by: Lucas Stach <dev at lynxeye.de>
Reviewed-by: Stefan Agner <stefan at agner.ch>
---
v2:
- remove Tegra 3 compatible
- remove useless part_probes
- don't store irq number
- use gpiod API instead of deprecated of_gpios
- don't store reset
- correct TIMING_TCS mask
- simplify irq handler
- correct timing calculations
- don't store buswidth
- drop compile test
- correct ECC handling
v3:
- remove superfluous NAND cap setting
- correct ECC layout
- don't flag ECC error for erased pages
- make MTD device name a bit human friendlier
- mark subpage writes as unsupported
- parse BBT on flash property
---
MAINTAINERS | 6 +
drivers/mtd/nand/Kconfig | 6 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/tegra_nand.c | 801 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 814 insertions(+)
create mode 100644 drivers/mtd/nand/tegra_nand.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 781e099..7e5551f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9747,6 +9747,12 @@ M: Laxman Dewangan <ldewangan at nvidia.com>
S: Supported
F: drivers/input/keyboard/tegra-kbc.c
+TEGRA NAND DRIVER
+M: Lucas Stach <dev at 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 at gmail.com>
S: Supported
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 5897d8d..2696418 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -530,4 +530,10 @@ config MTD_NAND_HISI504
help
Enables support for NAND controller on Hisilicon SoC Hip04.
+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/Makefile b/drivers/mtd/nand/Makefile
index 582bbd05..3228e6e 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -52,5 +52,6 @@ obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o
obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
+obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
nand-objs := nand_base.o nand_bbt.o nand_timings.o
diff --git a/drivers/mtd/nand/tegra_nand.c b/drivers/mtd/nand/tegra_nand.c
new file mode 100644
index 0000000..20ea1f1
--- /dev/null
+++ b/drivers/mtd/nand/tegra_nand.c
@@ -0,0 +1,801 @@
+/*
+ * Copyright (C) 2014-2015 Lucas Stach <dev at 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/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of_mtd.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) & 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) & 0x3) << 4)
+#define CMD_ALE_SIZE(x) (((x) & 0xf) << 0)
+
+#define STATUS 0x04
+
+#define ISR 0x08
+#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)
+
+struct tegra_nand {
+ void __iomem *regs;
+ struct clk *clk;
+ struct gpio_desc *wp_gpio;
+
+ struct nand_chip chip;
+ struct mtd_info mtd;
+ struct device *dev;
+
+ struct completion command_complete;
+ struct completion dma_complete;
+
+ 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)
+{
+ return container_of(mtd, struct tegra_nand, mtd);
+}
+
+static struct nand_ecclayout tegra_nand_oob_16 = {
+ .eccbytes = 4,
+ .eccpos = { 4, 5, 6, 7 },
+ .oobfree = {
+ { .offset = 8, . length = 8 }
+ }
+};
+
+static struct nand_ecclayout tegra_nand_oob_64 = {
+ .eccbytes = 36,
+ .eccpos = {
+ 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+ 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
+ 36, 37, 38, 39
+ },
+ .oobfree = {
+ { .offset = 40, .length = 24 }
+ }
+};
+
+static struct nand_ecclayout tegra_nand_oob_128 = {
+ .eccbytes = 72,
+ .eccpos = {
+ 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+ 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
+ 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
+ 68, 69, 70, 71, 72, 73, 74, 75
+ },
+ .oobfree = {
+ { .offset = 76, .length = 52 }
+ }
+};
+
+static struct nand_ecclayout tegra_nand_oob_224 = {
+ .eccbytes = 144,
+ .eccpos = {
+ 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
+ 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+ 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
+ 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68,
+ 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81,
+ 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94,
+ 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
+ 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120,
+ 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133,
+ 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
+ 147
+ },
+ .oobfree = {
+ { .offset = 148, .length = 76 }
+ }
+};
+
+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);
+
+ if (!isr && !(dma & DMA_CTRL_IS_DONE))
+ return IRQ_NONE;
+
+ 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 void tegra_nand_command(struct mtd_info *mtd, unsigned int command,
+ int column, int page_addr)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ u32 value;
+
+ switch (command) {
+ case NAND_CMD_READOOB:
+ column += mtd->writesize;
+ /* fall-through */
+
+ case NAND_CMD_READ0:
+ writel(NAND_CMD_READ0, nand->regs + CMD_1);
+ writel(NAND_CMD_READSTART, nand->regs + CMD_2);
+
+ value = (page_addr << 16) | (column & 0xffff);
+ writel(value, nand->regs + ADDR_1);
+
+ value = page_addr >> 16;
+ writel(value, nand->regs + ADDR_2);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(4) | CMD_SEC_CMD |
+ CMD_RBSY_CHK | CMD_CE(nand->cur_chip) | CMD_GO;
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_SEQIN:
+ writel(NAND_CMD_SEQIN, nand->regs + CMD_1);
+
+ value = (page_addr << 16) | (column & 0xffff);
+ writel(value, nand->regs + ADDR_1);
+
+ value = page_addr >> 16;
+ writel(value, nand->regs + ADDR_2);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(4) |
+ CMD_CE(nand->cur_chip) | CMD_GO;
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_PAGEPROG:
+ writel(NAND_CMD_PAGEPROG, nand->regs + CMD_1);
+
+ value = CMD_CLE | CMD_CE(nand->cur_chip) | CMD_GO;
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_READID:
+ writel(NAND_CMD_READID, nand->regs + CMD_1);
+ writel(column & 0xff, nand->regs + ADDR_1);
+
+ value = CMD_GO | CMD_CLE | CMD_ALE | CMD_CE(nand->cur_chip);
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_ERASE1:
+ writel(NAND_CMD_ERASE1, nand->regs + CMD_1);
+ writel(NAND_CMD_ERASE2, nand->regs + CMD_2);
+ writel(page_addr, nand->regs + ADDR_1);
+
+ value = CMD_GO | CMD_CLE | CMD_ALE | CMD_ALE_SIZE(2) |
+ CMD_SEC_CMD | CMD_RBSY_CHK | CMD_CE(nand->cur_chip);
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_ERASE2:
+ return;
+
+ case NAND_CMD_STATUS:
+ writel(NAND_CMD_STATUS, nand->regs + CMD_1);
+
+ value = CMD_GO | CMD_CLE | CMD_CE(nand->cur_chip);
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_PARAM:
+ writel(NAND_CMD_PARAM, nand->regs + CMD_1);
+ writel(column & 0xff, nand->regs + ADDR_1);
+ value = CMD_GO | CMD_CLE | CMD_ALE | CMD_CE(nand->cur_chip);
+ writel(value, nand->regs + CMD);
+ break;
+
+ case NAND_CMD_RESET:
+ writel(NAND_CMD_RESET, nand->regs + CMD_1);
+
+ value = CMD_GO | CMD_CLE | CMD_CE(nand->cur_chip);
+ writel(value, nand->regs + CMD);
+ break;
+
+ default:
+ dev_warn(nand->dev, "unsupported command: %x\n", command);
+ return;
+ }
+
+ wait_for_completion(&nand->command_complete);
+}
+
+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 uint8_t tegra_nand_read_byte(struct mtd_info *mtd)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ u32 value;
+
+ value = CMD_TRANS_SIZE(0) | CMD_CE(nand->cur_chip) |
+ CMD_PIO | CMD_RX | CMD_A_VALID | CMD_GO;
+
+ writel(value, nand->regs + CMD);
+ wait_for_completion(&nand->command_complete);
+
+ return readl(nand->regs + RESP) & 0xff;
+}
+
+static void tegra_nand_read_buf(struct mtd_info *mtd, uint8_t *buffer,
+ int length)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ size_t i;
+
+ for (i = 0; i < length; i += 4) {
+ u32 value;
+ size_t n = min_t(size_t, length - i, 4);
+
+ value = CMD_GO | CMD_PIO | CMD_RX | CMD_A_VALID |
+ CMD_CE(nand->cur_chip) | CMD_TRANS_SIZE(n - 1);
+
+ writel(value, nand->regs + CMD);
+ wait_for_completion(&nand->command_complete);
+
+ value = readl(nand->regs + RESP);
+ memcpy(buffer + i, &value, n);
+ }
+}
+
+static void tegra_nand_write_buf(struct mtd_info *mtd, const uint8_t *buffer,
+ int length)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ size_t i;
+
+ for (i = 0; i < length; i += 4) {
+ u32 value;
+ size_t n = min_t(size_t, length - i, 4);
+
+ memcpy(&value, buffer + i, n);
+ writel(value, nand->regs + RESP);
+
+ value = CMD_GO | CMD_PIO | CMD_TX | CMD_A_VALID |
+ CMD_CE(nand->cur_chip) | CMD_TRANS_SIZE(n - 1);
+
+ writel(value, nand->regs + CMD);
+ wait_for_completion(&nand->command_complete);
+ }
+}
+
+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;
+
+ 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->oobsize - 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_GO | CMD_RX | CMD_TRANS_SIZE(8) |
+ 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)
+ memcpy(chip->oob_poi, nand->oob_buf, mtd->oobsize);
+ 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;
+ u32 *data = (u32 *)buf;
+ for (i = 0; i < mtd->writesize / 4; i++) {
+ if (data[i] != 0xffffffff) {
+ mtd->ecc_stats.failed++;
+ return -EBADMSG;
+ }
+ }
+ return 0;
+ }
+
+ if (value & DEC_STATUS_ERR_COUNT_MASK) {
+ value = (value & DEC_STATUS_ERR_COUNT_MASK) >>
+ DEC_STATUS_ERR_COUNT_SHIFT;
+ mtd->ecc_stats.corrected += value;
+ 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)
+{
+ struct tegra_nand *nand = to_tegra_nand(mtd);
+ unsigned long value;
+
+ 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);
+
+ 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;
+ writel(value, nand->regs + DMA_CTRL);
+
+ value = CMD_GO | CMD_TX | CMD_A_VALID | CMD_TRANS_SIZE(8) |
+ CMD_CE(nand->cur_chip);
+ 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)
+{
+ unsigned long rate = clk_get_rate(nand->clk) / 1000000;
+ unsigned long period = 1000000 / rate;
+ const struct nand_sdr_timings *timings;
+ u32 val, reg = 0;
+
+ timings = onfi_async_timing_mode_to_sdr_timings(mode);
+
+ val = max3(timings->tAR_min, timings->tRR_min,
+ timings->tRC_min) / period;
+ if (val > 2)
+ val -= 3;
+ reg |= TIMING_TCR_TAR_TRR(val);
+
+ val = 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 = (max(timings->tRP_min, timings->tREA_max) + 6000) / period;
+ reg |= (TIMING_TRP(val) | TIMING_TRP_RESP(val));
+
+ reg |= TIMING_TWB(timings->tWB_max / period);
+ reg |= TIMING_TWHR(timings->tWHR_min / period);
+ reg |= TIMING_TWH(timings->tWH_min / period);
+ reg |= TIMING_TWP(timings->tWP_min / period);
+ reg |= TIMING_TRH(timings->tRHW_min / period);
+
+ writel(reg, nand->regs + TIMING_1);
+
+ val = 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, buswidth, 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, "nvidia,wp-gpios",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(nand->wp_gpio))
+ return PTR_ERR(nand->wp_gpio);
+
+ buswidth = of_get_nand_bus_width(pdev->dev.of_node);
+ if (buswidth < 0)
+ return buswidth;
+
+ 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);
+
+ mtd = &nand->mtd;
+ mtd->name = "tegra_nand";
+ mtd->owner = THIS_MODULE;
+ mtd->priv = &nand->chip;
+
+ /* 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);
+
+ value = 0;
+ if (buswidth == 16)
+ value |= CFG_BUS_WIDTH_16;
+ writel(value, nand->regs + CFG);
+
+ chip = &nand->chip;
+ chip->options = NAND_NO_SUBPAGE_WRITE;
+ chip->cmdfunc = tegra_nand_command;
+ chip->select_chip = tegra_nand_select_chip;
+ chip->read_byte = tegra_nand_read_byte;
+ chip->read_buf = tegra_nand_read_buf;
+ chip->write_buf = tegra_nand_write_buf;
+
+ if (of_get_nand_on_flash_bbt(pdev->dev.of_node))
+ chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
+
+ tegra_nand_setup_timing(nand, 0);
+
+ err = nand_scan_ident(mtd, 1, NULL);
+ if (err)
+ return err;
+
+ nand->data_buf = dmam_alloc_coherent(&pdev->dev, mtd->writesize,
+ &nand->data_dma, GFP_KERNEL);
+ if (!nand->data_buf)
+ return -ENOMEM;
+
+ nand->oob_buf = dmam_alloc_coherent(&pdev->dev, mtd->oobsize,
+ &nand->oob_dma, GFP_KERNEL);
+ if (!nand->oob_buf)
+ return -ENOMEM;
+
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.bytes = mtd->oobsize;
+ 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;
+
+ switch (mtd->oobsize) {
+ case 16:
+ chip->ecc.layout = &tegra_nand_oob_16;
+ chip->ecc.strength = 1;
+ value |= CFG_TAG_BYTE_SIZE(tegra_nand_oob_16.oobfree[0].length
+ - 1);
+ break;
+ case 64:
+ chip->ecc.layout = &tegra_nand_oob_64;
+ chip->ecc.strength = 8;
+ value |= CFG_ECC_SEL | CFG_TVAL_8 |
+ CFG_TAG_BYTE_SIZE(tegra_nand_oob_64.oobfree[0].length
+ - 1);
+ break;
+ case 128:
+ chip->ecc.layout = &tegra_nand_oob_128;
+ chip->ecc.strength = 8;
+ value |= CFG_ECC_SEL | CFG_TVAL_8 |
+ CFG_TAG_BYTE_SIZE(tegra_nand_oob_128.oobfree[0].length
+ - 1);
+ break;
+ case 224:
+ chip->ecc.layout = &tegra_nand_oob_224;
+ chip->ecc.strength = 8;
+ value |= CFG_ECC_SEL | CFG_TVAL_8 |
+ CFG_TAG_BYTE_SIZE(tegra_nand_oob_224.oobfree[0].length
+ - 1);
+ break;
+ default:
+ dev_err(&pdev->dev, "unhandled OOB size %d\n", mtd->oobsize);
+ return -ENODEV;
+ }
+
+ 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);
+ return -ENODEV;
+ }
+
+ writel(value, nand->regs + CFG);
+
+ tegra_nand_setup_chiptiming(nand);
+
+ err = nand_scan_tail(mtd);
+ if (err)
+ return err;
+
+ mtd_device_parse_register(mtd, NULL,
+ &(struct mtd_part_parser_data) {
+ .of_node = pdev->dev.of_node,
+ },
+ NULL, 0);
+
+ platform_set_drvdata(pdev, nand);
+
+ return 0;
+}
+
+static int tegra_nand_remove(struct platform_device *pdev)
+{
+ struct tegra_nand *nand = platform_get_drvdata(pdev);
+
+ nand_release(&nand->mtd);
+
+ 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 at avionic-design.de");
+MODULE_AUTHOR("Lucas Stach <dev at lynxeye.de");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
--
2.1.0
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