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 <[email protected]> Signed-off-by: Lucas Stach <[email protected]> --- 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 <[email protected]> S: Supported F: drivers/input/keyboard/tegra-kbc.c +TEGRA NAND DRIVER +M: Lucas Stach <[email protected]> +S: Maintained +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt +F: drivers/mtd/nand/tegra_nand.c + TEGRA PWM DRIVER M: Thierry Reding <[email protected]> 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 <[email protected]> + * 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) +#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; + struct clk *clk; + struct reset_control *rst; + int wp_gpio; + int buswidth; + + 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; + + 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: + 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" }, + { } +}; + +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 <[email protected]"); +MODULE_AUTHOR("Lucas Stach <[email protected]"); +MODULE_LICENSE("GPL v2"); +MODULE_DEVICE_TABLE(of, tegra_nand_of_match); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
