On 01/04/2015 05:39 PM, Lucas Stach wrote:
Hi Lucas,
The driver looks mostly good. Just a few comments on my side.
> Add support for the NAND flash controller found on NVIDIA
> Tegra 2/3 SoCs. This is a largely reworked version of the driver
> started by Thierry.
>
> Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Lucas Stach <dev@xxxxxxxxxx>
> ---
> I've tested this driver with the in-kernel mtd-tests and some
> realworld workloads on a Colibri T20 module.
> ---
> .../bindings/mtd/nvidia,tegra20-nand.txt | 30 +
> MAINTAINERS | 6 +
> drivers/mtd/nand/Kconfig | 6 +
> drivers/mtd/nand/Makefile | 1 +
> drivers/mtd/nand/tegra_nand.c | 794 +++++++++++++++++++++
> 5 files changed, 837 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> create mode 100644 drivers/mtd/nand/tegra_nand.c
>
> diff --git a/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> new file mode 100644
> index 0000000..088223c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> @@ -0,0 +1,30 @@
> +NVIDIA Tegra NAND Flash controller
> +
> +Required properties:
> +- compatible: Must be one of:
> + - "nvidia,tegra20-nand"
> + - "nvidia,tegra30-nand"
> +- reg: MMIO address range
> +- interrupts: interrupt output of the NFC controller
> +- clocks: Must contain an entry for each entry in clock-names.
> + See ../clocks/clock-bindings.txt for details.
> +- clock-names: Must include the following entries:
> + - nand
> +- resets: Must contain an entry for each entry in reset-names.
> + See ../reset/reset.txt for details.
> +- reset-names: Must include the following entries:
> + - nand
> +
> +Optional properties:
> +- nvidia,wp-gpios: GPIO used to disable write protection of the flash
> +
> + Example:
> + nand@70008000 {
> + compatible = "nvidia,tegra20-nand";
> + reg = <0x70008000 0x100>;
> + interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&tegra_car TEGRA20_CLK_NDFLASH>;
> + clock-names = "nand";
> + resets = <&tegra_car 13>;
> + reset-names = "nand";
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ddb9ac8..972e31d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9459,6 +9459,12 @@ M: Laxman Dewangan <ldewangan@xxxxxxxxxx>
> S: Supported
> F: drivers/input/keyboard/tegra-kbc.c
>
> +TEGRA NAND DRIVER
> +M: Lucas Stach <dev@xxxxxxxxxx>
> +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@xxxxxxxxx>
> S: Supported
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index 7d0150d..1eafd4e 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -524,4 +524,10 @@ config MTD_NAND_SUNXI
> help
> Enables support for NAND Flash chips on Allwinner SoCs.
>
> +config MTD_NAND_TEGRA
> + tristate "Support for NAND on NVIDIA Tegra"
> + depends on ARCH_TEGRA || COMPILE_TEST
> + 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 bd38f21..58399ce 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -51,5 +51,6 @@ obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
> obj-$(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_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..b919a6e
> --- /dev/null
> +++ b/drivers/mtd/nand/tegra_nand.c
> @@ -0,0 +1,794 @@
> +/*
> + * Copyright (C) 2014-2015 Lucas Stach <dev@xxxxxxxxxx>
> + * 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/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/mtd/partitions.h>
> +#include <linux/of_gpio.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)
How about using BIT() ?
> +#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) & 0xc) << 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 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_RESULT 0xd0
> +#define DEC_RESULT_CORRFAIL (1 << 8)
> +
> +#define DEC_STATUS_BUF 0xd4
> +#define DEC_STATUS_BUF_FAIL_SEC_FLAG(x) ((x) & (0xff << 24))
> +#define DEC_STATUS_BUF_CORR_SEC_FLAG(x) ((x) & (0xff << 16))
> +#define DEC_STATUS_BUF_MAX_CORR_CNT(x) (((x) & 0xf00) >> 8)
> +
> +struct tegra_nand {
> + void __iomem *regs;
> + int irq;
Seems like you don't need to store irq.
> + struct clk *clk;
> + struct reset_control *rst;
> + int wp_gpio;
> + int buswidth;
And also you don't seem to need either wp_gpio or buswidth stored
in the struct. You only use them at probe time.
> +
> + 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 = { 3, 4, 5, 6 },
> + .oobfree = {
> + { .offset = 8, . length = 8 }
> + }
> +};
> +
> +static struct nand_ecclayout tegra_nand_oob_64 = {
> + .eccbytes = 36,
> + .eccpos = {
> + 3, 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 = 20 }
> + }
> +};
> +
> +static struct nand_ecclayout tegra_nand_oob_128 = {
> + .eccbytes = 72,
> + .eccpos = {
> + 3, 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 = {
> + 3, 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;
> + irqreturn_t ret = IRQ_HANDLED;
> + u32 isr, dma;
> +
> + isr = readl(nand->regs + ISR);
> + dma = readl(nand->regs + DMA_CTRL);
> +
> + if (!isr && !(dma & DMA_CTRL_IS_DONE)) {
> + ret = IRQ_NONE;
> + goto out;
> + }
> +
> + 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);
> +
> +out:
> + return ret;
> +}
> +
> +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;
> +
> + 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 + DEC_RESULT);
> + if (value & DEC_RESULT_CORRFAIL) {
> + value = readl(nand->regs + DEC_STATUS_BUF);
> +
> + if (DEC_STATUS_BUF_FAIL_SEC_FLAG(value))
> + return -1;
> +
> + if (DEC_STATUS_BUF_CORR_SEC_FLAG(value))
> + return DEC_STATUS_BUF_MAX_CORR_CNT(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;
> + int ret = 0;
> +
> + 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);
> +
> + return ret;
> +}
> +
> +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 -= 2;
> + 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 -= 1;
> + reg |= TIMING_TCS(val);
> +
> + val = max(timings->tRP_min, timings->tREA_max) + 6000;
> + reg |= TIMING_TRP(val / 1000);
> + reg |= TIMING_TRP_RESP(val / period);
> +
> + reg |= TIMING_TWB(timings->tWB_max / period);
> + reg |= TIMING_TWHR(timings->tWHR_min / period);
> + reg |= TIMING_TWH(timings->tWH_min / 1000);
> + reg |= TIMING_TWP(timings->tWP_min / 1000);
> + reg |= TIMING_TRH(timings->tRHW_min / 1000);
> +
> + writel(reg, nand->regs + TIMING_1);
> +
> + val = timings->tADL_min / period;
> + if (val > 2)
> + val -= 2;
> + 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_parse_dt(struct device_node *node,
> + struct tegra_nand *nand)
> +{
> + enum of_gpio_flags flags;
> +
> + nand->wp_gpio = of_get_named_gpio_flags(node, "nvidia,wp-gpios", 0,
> + &flags);
> + if (nand->wp_gpio < 0)
> + nand->wp_gpio = 0;
> +
> + nand->buswidth = of_get_nand_bus_width(node);
> + if (nand->buswidth < 0)
> + return nand->buswidth;
> +
I believe you should set NAND_BUSWIDTH_16 flag in nand_chip.options,
before calling nand_scan_ident?
Also, if you just access the of_get_nand_bus_width before nand_scan_ident
you can drop the nand->buswidth field.
Same goes for wp_gpio.
> + return 0;
> +}
> +
> +static const char * const part_probes[] = {
> + "cmdlinepart", "ofpart", NULL };
> +
> +static int tegra_nand_probe(struct platform_device *pdev)
> +{
> + struct tegra_nand *nand;
> + struct nand_chip *chip;
> + struct mtd_info *mtd;
> + struct resource *res;
> + unsigned long value;
> + int 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);
> +
> + nand->irq = platform_get_irq(pdev, 0);
> + err = devm_request_irq(&pdev->dev, nand->irq, tegra_nand_irq, 0,
> + dev_name(&pdev->dev), nand);
> + if (err)
> + return err;
> +
> + nand->rst = devm_reset_control_get(&pdev->dev, "nand");
> + if (IS_ERR(nand->rst))
> + return PTR_ERR(nand->rst);
> +
> + nand->clk = devm_clk_get(&pdev->dev, "nand");
> + if (IS_ERR(nand->clk))
> + return PTR_ERR(nand->clk);
> +
> + err = tegra_nand_parse_dt(pdev->dev.of_node, nand);
> + if (err)
> + return err;
> +
> + err = clk_prepare_enable(nand->clk);
> + if (err)
> + return err;
> +
> + reset_control_assert(nand->rst);
> + udelay(2);
> + reset_control_deassert(nand->rst);
> +
> + if (gpio_is_valid(nand->wp_gpio)) {
> + err = devm_gpio_request_one(&pdev->dev, nand->wp_gpio,
> + GPIOF_OUT_INIT_HIGH, "tegra-nand-wp");
> + if (err)
> + return err;
> + }
> +
> + 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 = dev_name(&pdev->dev);
> + mtd->owner = THIS_MODULE;
> + mtd->priv = &nand->chip;
> +
> + mtd->type = MTD_NANDFLASH;
> + mtd->flags = MTD_CAP_NANDFLASH;
> +
> + /* 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);
> +
> + chip = &nand->chip;
> + 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;
> +
> + 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 = CFG_HW_ECC | CFG_ECC_SEL | CFG_ERR_COR | CFG_PIPE_EN |
> + CFG_TVAL_8 | 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(4);
> + break;
> + case 64:
> + chip->ecc.layout = &tegra_nand_oob_64;
> + chip->ecc.strength = 8;
> + value |= CFG_TAG_BYTE_SIZE(36);
> + break;
> + case 128:
> + chip->ecc.layout = &tegra_nand_oob_128;
> + chip->ecc.strength = 8;
> + value |= CFG_TAG_BYTE_SIZE(72);
> + break;
> + case 224:
> + chip->ecc.layout = &tegra_nand_oob_224;
> + chip->ecc.strength = 8;
> + value |= CFG_TAG_BYTE_SIZE(144);
> + 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:
Nit: we have macros for these values (SZ_256, ..., SZ_4K).
> + value |= CFG_PS_4096;
> + break;
> + default:
> + dev_err(&pdev->dev, "unhandled writesize %d\n", mtd->writesize);
> + return -ENODEV;
> + }
> +
> + if (nand->buswidth == 16)
> + value |= CFG_BUS_WIDTH_16;
> +
> + 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" },
> + { .compatible = "nvidia,tegra30-nand" },
AFAIK, having two compatible strings, but making no distinction between
them is typically frowned upon by devicetree maintainers.
Is the controller any different in tegra20 and tegra30?
If you are not sure about the controllers being different, you can
try the following approach. The devicetree is written like this:
nand@foo {
compatible = "nvidia,tegra20-nand", "nvidia,tegra-nand";
};
So you only deal with "nvidia,tegra-nand" in the driver, yet the
devicetree files are prepared to deal with a difference.
> + { }
> +};
> +
> +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@xxxxxxxxxxxxxxxxx");
> +MODULE_AUTHOR("Lucas Stach <dev@xxxxxxxxxx");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
>
Regards,
--
Ezequiel Garcia, VanguardiaSur
www.vanguardiasur.com.ar
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