diff options
Diffstat (limited to 'target/linux/ipq806x/patches-3.18/162-mtd-nand-Qualcomm-NAND-controller-driver.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-3.18/162-mtd-nand-Qualcomm-NAND-controller-driver.patch | 2024 |
1 files changed, 2024 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-3.18/162-mtd-nand-Qualcomm-NAND-controller-driver.patch b/target/linux/ipq806x/patches-3.18/162-mtd-nand-Qualcomm-NAND-controller-driver.patch new file mode 100644 index 0000000000..6172f7dec8 --- /dev/null +++ b/target/linux/ipq806x/patches-3.18/162-mtd-nand-Qualcomm-NAND-controller-driver.patch @@ -0,0 +1,2024 @@ +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +Subject: [v3,2/5] mtd: nand: Qualcomm NAND controller driver +From: Archit Taneja <architt@codeaurora.org> +X-Patchwork-Id: 6927101 +Message-Id: <1438578498-32254-3-git-send-email-architt@codeaurora.org> +To: linux-mtd@lists.infradead.org, dehrenberg@google.com, + cernekee@gmail.com, computersforpeace@gmail.com +Cc: linux-arm-msm@vger.kernel.org, agross@codeaurora.org, + sboyd@codeaurora.org, linux-kernel@vger.kernel.org, + Archit Taneja <architt@codeaurora.org> +Date: Mon, 3 Aug 2015 10:38:15 +0530 + +The Qualcomm NAND controller is found in SoCs like IPQ806x, MSM7xx, +MDM9x15 series. + +It exists as a sub block inside the IPs EBI2 (External Bus Interface 2) +and QPIC (Qualcomm Parallel Interface Controller). These IPs provide a +broader interface for external slow peripheral devices such as LCD and +NAND/NOR flash memory or SRAM like interfaces. + +We add support for the NAND controller found within EBI2. For the SoCs +of our interest, we only use the NAND controller within EBI2. Therefore, +it's safe for us to assume that the NAND controller is a standalone block +within the SoC. + +The controller supports 512B, 2kB, 4kB and 8kB page 8-bit and 16-bit NAND +flash devices. It contains a HW ECC block that supports BCH ECC (4, 8 and +16 bit correction/step) and RS ECC(4 bit correction/step) that covers main +and spare data. The controller contains an internal 512 byte page buffer +to which we read/write via DMA. The EBI2 type NAND controller uses ADM DMA +for register read/write and data transfers. The controller performs page +reads and writes at a codeword/step level of 512 bytes. It can support up +to 2 external chips of different configurations. + +The driver prepares register read and write configuration descriptors for +each codeword, followed by data descriptors to read or write data from the +controller's internal buffer. It uses a single ADM DMA channel that we get +via dmaengine API. The controller requires 2 ADM CRCIs for command and +data flow control. These are passed via DT. + +The ecc layout used by the controller is syndrome like, but we can't use +the standard syndrome ecc ops because of several reasons. First, the amount +of data bytes covered by ecc isn't same in each step. Second, writing to +free oob space requires us writing to the entire step in which the oob +lies. This forces us to create our own ecc ops. + +One more difference is how the controller accesses the bad block marker. +The controller ignores reading the marker when ECC is enabled. ECC needs +to be explicity disabled to read or write to the bad block marker. For +this reason, we use the newly created flag NAND_BBT_ACCESS_BBM_RAW to +read the factory provided bad block markers. + +v3: +- Refactor dma functions for maximum reuse +- Use dma_slave_confing on stack +- optimize and clean upempty_page_fixup using memchr_inv +- ensure portability with dma register reads using le32_* funcs +- use NAND_USE_BOUNCE_BUFFER instead of doing it ourselves +- fix handling of return values of dmaengine funcs +- constify wherever possible +- Remove dependency on ADM DMA in Kconfig +- Misc fixes and clean ups + +v2: +- Use new BBT flag that allows us to read BBM in raw mode +- reduce memcpy-s in the driver +- some refactor and clean ups because of above changes + +Reviewed-by: Andy Gross <agross@codeaurora.org> +Signed-off-by: Archit Taneja <architt@codeaurora.org> + +--- +drivers/mtd/nand/Kconfig | 7 + + drivers/mtd/nand/Makefile | 1 + + drivers/mtd/nand/qcom_nandc.c | 1913 +++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 1921 insertions(+) + create mode 100644 drivers/mtd/nand/qcom_nandc.c + +--- a/drivers/mtd/nand/Kconfig ++++ b/drivers/mtd/nand/Kconfig +@@ -516,4 +516,11 @@ config MTD_NAND_XWAY + Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached + to the External Bus Unit (EBU). + ++config MTD_NAND_QCOM ++ tristate "Support for NAND on QCOM SoCs" ++ depends on ARCH_QCOM ++ help ++ Enables support for NAND flash chips on SoCs containing the EBI2 NAND ++ controller. This controller is found on IPQ806x SoC. ++ + endif # MTD_NAND +--- /dev/null ++++ b/drivers/mtd/nand/qcom_nandc.c +@@ -0,0 +1,1918 @@ ++/* ++ * Copyright (c) 2015, The Linux Foundation. All rights reserved. ++ * ++ * This software is licensed under the terms of the GNU General Public ++ * License version 2, as published by the Free Software Foundation, and ++ * may be copied, distributed, and modified under those terms. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ */ ++ ++#include <linux/clk.h> ++#include <linux/slab.h> ++#include <linux/bitops.h> ++#include <linux/dma-mapping.h> ++#include <linux/dmaengine.h> ++#include <linux/module.h> ++#include <linux/mtd/nand.h> ++#include <linux/mtd/partitions.h> ++#include <linux/of.h> ++#include <linux/of_device.h> ++#include <linux/of_mtd.h> ++#include <linux/delay.h> ++ ++/* NANDc reg offsets */ ++#define NAND_FLASH_CMD 0x00 ++#define NAND_ADDR0 0x04 ++#define NAND_ADDR1 0x08 ++#define NAND_FLASH_CHIP_SELECT 0x0c ++#define NAND_EXEC_CMD 0x10 ++#define NAND_FLASH_STATUS 0x14 ++#define NAND_BUFFER_STATUS 0x18 ++#define NAND_DEV0_CFG0 0x20 ++#define NAND_DEV0_CFG1 0x24 ++#define NAND_DEV0_ECC_CFG 0x28 ++#define NAND_DEV1_ECC_CFG 0x2c ++#define NAND_DEV1_CFG0 0x30 ++#define NAND_DEV1_CFG1 0x34 ++#define NAND_READ_ID 0x40 ++#define NAND_READ_STATUS 0x44 ++#define NAND_DEV_CMD0 0xa0 ++#define NAND_DEV_CMD1 0xa4 ++#define NAND_DEV_CMD2 0xa8 ++#define NAND_DEV_CMD_VLD 0xac ++#define SFLASHC_BURST_CFG 0xe0 ++#define NAND_ERASED_CW_DETECT_CFG 0xe8 ++#define NAND_ERASED_CW_DETECT_STATUS 0xec ++#define NAND_EBI2_ECC_BUF_CFG 0xf0 ++#define FLASH_BUF_ACC 0x100 ++ ++#define NAND_CTRL 0xf00 ++#define NAND_VERSION 0xf08 ++#define NAND_READ_LOCATION_0 0xf20 ++#define NAND_READ_LOCATION_1 0xf24 ++ ++/* dummy register offsets, used by write_reg_dma */ ++#define NAND_DEV_CMD1_RESTORE 0xdead ++#define NAND_DEV_CMD_VLD_RESTORE 0xbeef ++ ++/* NAND_FLASH_CMD bits */ ++#define PAGE_ACC BIT(4) ++#define LAST_PAGE BIT(5) ++ ++/* NAND_FLASH_CHIP_SELECT bits */ ++#define NAND_DEV_SEL 0 ++#define DM_EN BIT(2) ++ ++/* NAND_FLASH_STATUS bits */ ++#define FS_OP_ERR BIT(4) ++#define FS_READY_BSY_N BIT(5) ++#define FS_MPU_ERR BIT(8) ++#define FS_DEVICE_STS_ERR BIT(16) ++#define FS_DEVICE_WP BIT(23) ++ ++/* NAND_BUFFER_STATUS bits */ ++#define BS_UNCORRECTABLE_BIT BIT(8) ++#define BS_CORRECTABLE_ERR_MSK 0x1f ++ ++/* NAND_DEVn_CFG0 bits */ ++#define DISABLE_STATUS_AFTER_WRITE 4 ++#define CW_PER_PAGE 6 ++#define UD_SIZE_BYTES 9 ++#define ECC_PARITY_SIZE_BYTES_RS 19 ++#define SPARE_SIZE_BYTES 23 ++#define NUM_ADDR_CYCLES 27 ++#define STATUS_BFR_READ 30 ++#define SET_RD_MODE_AFTER_STATUS 31 ++ ++/* NAND_DEVn_CFG0 bits */ ++#define DEV0_CFG1_ECC_DISABLE 0 ++#define WIDE_FLASH 1 ++#define NAND_RECOVERY_CYCLES 2 ++#define CS_ACTIVE_BSY 5 ++#define BAD_BLOCK_BYTE_NUM 6 ++#define BAD_BLOCK_IN_SPARE_AREA 16 ++#define WR_RD_BSY_GAP 17 ++#define ENABLE_BCH_ECC 27 ++ ++/* NAND_DEV0_ECC_CFG bits */ ++#define ECC_CFG_ECC_DISABLE 0 ++#define ECC_SW_RESET 1 ++#define ECC_MODE 4 ++#define ECC_PARITY_SIZE_BYTES_BCH 8 ++#define ECC_NUM_DATA_BYTES 16 ++#define ECC_FORCE_CLK_OPEN 30 ++ ++/* NAND_DEV_CMD1 bits */ ++#define READ_ADDR 0 ++ ++/* NAND_DEV_CMD_VLD bits */ ++#define READ_START_VLD 0 ++ ++/* NAND_EBI2_ECC_BUF_CFG bits */ ++#define NUM_STEPS 0 ++ ++/* NAND_ERASED_CW_DETECT_CFG bits */ ++#define ERASED_CW_ECC_MASK 1 ++#define AUTO_DETECT_RES 0 ++#define MASK_ECC (1 << ERASED_CW_ECC_MASK) ++#define RESET_ERASED_DET (1 << AUTO_DETECT_RES) ++#define ACTIVE_ERASED_DET (0 << AUTO_DETECT_RES) ++#define CLR_ERASED_PAGE_DET (RESET_ERASED_DET | MASK_ECC) ++#define SET_ERASED_PAGE_DET (ACTIVE_ERASED_DET | MASK_ECC) ++ ++/* NAND_ERASED_CW_DETECT_STATUS bits */ ++#define PAGE_ALL_ERASED BIT(7) ++#define CODEWORD_ALL_ERASED BIT(6) ++#define PAGE_ERASED BIT(5) ++#define CODEWORD_ERASED BIT(4) ++#define ERASED_PAGE (PAGE_ALL_ERASED | PAGE_ERASED) ++#define ERASED_CW (CODEWORD_ALL_ERASED | CODEWORD_ERASED) ++ ++/* Version Mask */ ++#define NAND_VERSION_MAJOR_MASK 0xf0000000 ++#define NAND_VERSION_MAJOR_SHIFT 28 ++#define NAND_VERSION_MINOR_MASK 0x0fff0000 ++#define NAND_VERSION_MINOR_SHIFT 16 ++ ++/* NAND OP_CMDs */ ++#define PAGE_READ 0x2 ++#define PAGE_READ_WITH_ECC 0x3 ++#define PAGE_READ_WITH_ECC_SPARE 0x4 ++#define PROGRAM_PAGE 0x6 ++#define PAGE_PROGRAM_WITH_ECC 0x7 ++#define PROGRAM_PAGE_SPARE 0x9 ++#define BLOCK_ERASE 0xa ++#define FETCH_ID 0xb ++#define RESET_DEVICE 0xd ++ ++/* ++ * the NAND controller performs reads/writes with ECC in 516 byte chunks. ++ * the driver calls the chunks 'step' or 'codeword' interchangeably ++ */ ++#define NANDC_STEP_SIZE 512 ++ ++/* ++ * the largest page size we support is 8K, this will have 16 steps/codewords ++ * of 512 bytes each ++ */ ++#define MAX_NUM_STEPS (SZ_8K / NANDC_STEP_SIZE) ++ ++/* we read at most 3 registers per codeword scan */ ++#define MAX_REG_RD (3 * MAX_NUM_STEPS) ++ ++/* ECC modes */ ++#define ECC_NONE BIT(0) ++#define ECC_RS_4BIT BIT(1) ++#define ECC_BCH_4BIT BIT(2) ++#define ECC_BCH_8BIT BIT(3) ++ ++struct desc_info { ++ struct list_head list; ++ ++ enum dma_transfer_direction dir; ++ struct scatterlist sgl; ++ struct dma_async_tx_descriptor *dma_desc; ++}; ++ ++/* ++ * holds the current register values that we want to write. acts as a contiguous ++ * chunk of memory which we use to write the controller registers through DMA. ++ */ ++struct nandc_regs { ++ u32 cmd; ++ u32 addr0; ++ u32 addr1; ++ u32 chip_sel; ++ u32 exec; ++ ++ u32 cfg0; ++ u32 cfg1; ++ u32 ecc_bch_cfg; ++ ++ u32 clrflashstatus; ++ u32 clrreadstatus; ++ ++ u32 cmd1; ++ u32 vld; ++ ++ u32 orig_cmd1; ++ u32 orig_vld; ++ ++ u32 ecc_buf_cfg; ++}; ++ ++/* ++ * @cmd_crci: ADM DMA CRCI for command flow control ++ * @data_crci: ADM DMA CRCI for data flow control ++ * @list: DMA descriptor list (list of desc_infos) ++ * @dma_done: completion param to denote end of last ++ * descriptor in the list ++ * @data_buffer: our local DMA buffer for page read/writes, ++ * used when we can't use the buffer provided ++ * by upper layers directly ++ * @buf_size/count/start: markers for chip->read_buf/write_buf functions ++ * @reg_read_buf: buffer for reading register data via DMA ++ * @reg_read_pos: marker for data read in reg_read_buf ++ * @cfg0, cfg1, cfg0_raw..: NANDc register configurations needed for ++ * ecc/non-ecc mode for the current nand flash ++ * device ++ * @regs: a contiguous chunk of memory for DMA register ++ * writes ++ * @ecc_strength: 4 bit or 8 bit ecc, received via DT ++ * @bus_width: 8 bit or 16 bit NAND bus width, received via DT ++ * @ecc_modes: supported ECC modes by the current controller, ++ * initialized via DT match data ++ * @cw_size: the number of bytes in a single step/codeword ++ * of a page, consisting of all data, ecc, spare ++ * and reserved bytes ++ * @cw_data: the number of bytes within a codeword protected ++ * by ECC ++ * @bch_enabled: flag to tell whether BCH or RS ECC mode is used ++ * @status: value to be returned if NAND_CMD_STATUS command ++ * is executed ++ */ ++struct qcom_nandc_data { ++ struct platform_device *pdev; ++ struct device *dev; ++ ++ void __iomem *base; ++ struct resource *res; ++ ++ struct clk *core_clk; ++ struct clk *aon_clk; ++ ++ /* DMA stuff */ ++ struct dma_chan *chan; ++ struct dma_slave_config slave_conf; ++ unsigned int cmd_crci; ++ unsigned int data_crci; ++ struct list_head list; ++ struct completion dma_done; ++ ++ /* MTD stuff */ ++ struct nand_chip chip; ++ struct mtd_info mtd; ++ ++ /* local data buffer and markers */ ++ u8 *data_buffer; ++ int buf_size; ++ int buf_count; ++ int buf_start; ++ ++ /* local buffer to read back registers */ ++ u32 *reg_read_buf; ++ int reg_read_pos; ++ ++ /* required configs */ ++ u32 cfg0, cfg1; ++ u32 cfg0_raw, cfg1_raw; ++ u32 ecc_buf_cfg; ++ u32 ecc_bch_cfg; ++ u32 clrflashstatus; ++ u32 clrreadstatus; ++ u32 sflashc_burst_cfg; ++ u32 cmd1, vld; ++ ++ /* register state */ ++ struct nandc_regs *regs; ++ ++ /* things we get from DT */ ++ int ecc_strength; ++ int bus_width; ++ ++ u32 ecc_modes; ++ ++ /* misc params */ ++ int cw_size; ++ int cw_data; ++ bool use_ecc; ++ bool bch_enabled; ++ u8 status; ++ int last_command; ++}; ++ ++static inline u32 nandc_read(struct qcom_nandc_data *this, int offset) ++{ ++ return ioread32(this->base + offset); ++} ++ ++static inline void nandc_write(struct qcom_nandc_data *this, int offset, ++ u32 val) ++{ ++ iowrite32(val, this->base + offset); ++} ++ ++/* helper to configure address register values */ ++static void set_address(struct qcom_nandc_data *this, u16 column, int page) ++{ ++ struct nand_chip *chip = &this->chip; ++ struct nandc_regs *regs = this->regs; ++ ++ if (chip->options & NAND_BUSWIDTH_16) ++ column >>= 1; ++ ++ regs->addr0 = page << 16 | column; ++ regs->addr1 = page >> 16 & 0xff; ++} ++ ++/* ++ * update_rw_regs: set up read/write register values, these will be ++ * written to the NAND controller registers via DMA ++ * ++ * @num_cw: number of steps for the read/write operation ++ * @read: read or write operation ++ */ ++static void update_rw_regs(struct qcom_nandc_data *this, int num_cw, bool read) ++{ ++ struct nandc_regs *regs = this->regs; ++ ++ if (read) { ++ if (this->use_ecc) ++ regs->cmd = PAGE_READ_WITH_ECC | PAGE_ACC | LAST_PAGE; ++ else ++ regs->cmd = PAGE_READ | PAGE_ACC | LAST_PAGE; ++ } else { ++ regs->cmd = PROGRAM_PAGE | PAGE_ACC | LAST_PAGE; ++ } ++ ++ if (this->use_ecc) { ++ regs->cfg0 = (this->cfg0 & ~(7U << CW_PER_PAGE)) | ++ (num_cw - 1) << CW_PER_PAGE; ++ ++ regs->cfg1 = this->cfg1; ++ regs->ecc_bch_cfg = this->ecc_bch_cfg; ++ } else { ++ regs->cfg0 = (this->cfg0_raw & ~(7U << CW_PER_PAGE)) | ++ (num_cw - 1) << CW_PER_PAGE; ++ ++ regs->cfg1 = this->cfg1_raw; ++ regs->ecc_bch_cfg = 1 << ECC_CFG_ECC_DISABLE; ++ } ++ ++ regs->ecc_buf_cfg = this->ecc_buf_cfg; ++ regs->clrflashstatus = this->clrflashstatus; ++ regs->clrreadstatus = this->clrreadstatus; ++ regs->exec = 1; ++} ++ ++static int prep_dma_desc(struct qcom_nandc_data *this, bool read, int reg_off, ++ const void *vaddr, int size, bool flow_control) ++{ ++ struct desc_info *desc; ++ struct dma_async_tx_descriptor *dma_desc; ++ struct scatterlist *sgl; ++ struct dma_slave_config slave_conf; ++ int r; ++ ++ desc = kzalloc(sizeof(*desc), GFP_KERNEL); ++ if (!desc) ++ return -ENOMEM; ++ ++ list_add_tail(&desc->list, &this->list); ++ ++ sgl = &desc->sgl; ++ ++ sg_init_one(sgl, vaddr, size); ++ ++ desc->dir = read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; ++ ++ r = dma_map_sg(this->dev, sgl, 1, desc->dir); ++ if (r == 0) { ++ r = -ENOMEM; ++ goto err; ++ } ++ ++ memset(&slave_conf, 0x00, sizeof(slave_conf)); ++ ++ slave_conf.device_fc = flow_control; ++ if (read) { ++ slave_conf.src_maxburst = 16; ++ slave_conf.src_addr = this->res->start + reg_off; ++ slave_conf.slave_id = this->data_crci; ++ } else { ++ slave_conf.dst_maxburst = 16; ++ slave_conf.dst_addr = this->res->start + reg_off; ++ slave_conf.slave_id = this->cmd_crci; ++ } ++ ++ r = dmaengine_slave_config(this->chan, &slave_conf); ++ if (r) { ++ dev_err(this->dev, "failed to configure dma channel\n"); ++ goto err; ++ } ++ ++ dma_desc = dmaengine_prep_slave_sg(this->chan, sgl, 1, desc->dir, 0); ++ if (!dma_desc) { ++ dev_err(this->dev, "failed to prepare desc\n"); ++ r = -EINVAL; ++ goto err; ++ } ++ ++ desc->dma_desc = dma_desc; ++ ++ return 0; ++err: ++ kfree(desc); ++ ++ return r; ++} ++ ++/* ++ * read_reg_dma: prepares a descriptor to read a given number of ++ * contiguous registers to the reg_read_buf pointer ++ * ++ * @first: offset of the first register in the contiguous block ++ * @num_regs: number of registers to read ++ */ ++static int read_reg_dma(struct qcom_nandc_data *this, int first, int num_regs) ++{ ++ bool flow_control = false; ++ void *vaddr; ++ int size; ++ ++ if (first == NAND_READ_ID || first == NAND_FLASH_STATUS) ++ flow_control = true; ++ ++ size = num_regs * sizeof(u32); ++ vaddr = this->reg_read_buf + this->reg_read_pos; ++ this->reg_read_pos += num_regs; ++ ++ return prep_dma_desc(this, true, first, vaddr, size, flow_control); ++} ++ ++/* ++ * write_reg_dma: prepares a descriptor to write a given number of ++ * contiguous registers ++ * ++ * @first: offset of the first register in the contiguous block ++ * @num_regs: number of registers to write ++ */ ++static int write_reg_dma(struct qcom_nandc_data *this, int first, int num_regs) ++{ ++ bool flow_control = false; ++ struct nandc_regs *regs = this->regs; ++ void *vaddr; ++ int size; ++ ++ switch (first) { ++ case NAND_FLASH_CMD: ++ vaddr = ®s->cmd; ++ flow_control = true; ++ break; ++ case NAND_EXEC_CMD: ++ vaddr = ®s->exec; ++ break; ++ case NAND_FLASH_STATUS: ++ vaddr = ®s->clrflashstatus; ++ break; ++ case NAND_DEV0_CFG0: ++ vaddr = ®s->cfg0; ++ break; ++ case NAND_READ_STATUS: ++ vaddr = ®s->clrreadstatus; ++ break; ++ case NAND_DEV_CMD1: ++ vaddr = ®s->cmd1; ++ break; ++ case NAND_DEV_CMD1_RESTORE: ++ first = NAND_DEV_CMD1; ++ vaddr = ®s->orig_cmd1; ++ break; ++ case NAND_DEV_CMD_VLD: ++ vaddr = ®s->vld; ++ break; ++ case NAND_DEV_CMD_VLD_RESTORE: ++ first = NAND_DEV_CMD_VLD; ++ vaddr = ®s->orig_vld; ++ break; ++ case NAND_EBI2_ECC_BUF_CFG: ++ vaddr = ®s->ecc_buf_cfg; ++ break; ++ default: ++ dev_err(this->dev, "invalid starting register\n"); ++ return -EINVAL; ++ } ++ ++ size = num_regs * sizeof(u32); ++ ++ return prep_dma_desc(this, false, first, vaddr, size, flow_control); ++} ++ ++/* ++ * read_data_dma: prepares a DMA descriptor to transfer data from the ++ * controller's internal buffer to the buffer 'vaddr' ++ * ++ * @reg_off: offset within the controller's data buffer ++ * @vaddr: virtual address of the buffer we want to write to ++ * @size: DMA transaction size in bytes ++ */ ++static int read_data_dma(struct qcom_nandc_data *this, int reg_off, ++ const u8 *vaddr, int size) ++{ ++ return prep_dma_desc(this, true, reg_off, vaddr, size, false); ++} ++ ++/* ++ * write_data_dma: prepares a DMA descriptor to transfer data from ++ * 'vaddr' to the controller's internal buffer ++ * ++ * @reg_off: offset within the controller's data buffer ++ * @vaddr: virtual address of the buffer we want to read from ++ * @size: DMA transaction size in bytes ++ */ ++static int write_data_dma(struct qcom_nandc_data *this, int reg_off, ++ const u8 *vaddr, int size) ++{ ++ return prep_dma_desc(this, false, reg_off, vaddr, size, false); ++} ++ ++/* ++ * helper to prepare dma descriptors to configure registers needed for reading a ++ * codeword/step in a page ++ */ ++static void config_cw_read(struct qcom_nandc_data *this) ++{ ++ write_reg_dma(this, NAND_FLASH_CMD, 3); ++ write_reg_dma(this, NAND_DEV0_CFG0, 3); ++ write_reg_dma(this, NAND_EBI2_ECC_BUF_CFG, 1); ++ ++ write_reg_dma(this, NAND_EXEC_CMD, 1); ++ ++ read_reg_dma(this, NAND_FLASH_STATUS, 2); ++ read_reg_dma(this, NAND_ERASED_CW_DETECT_STATUS, 1); ++} ++ ++/* ++ * helpers to prepare dma descriptors used to configure registers needed for ++ * writing a codeword/step in a page ++ */ ++static void config_cw_write_pre(struct qcom_nandc_data *this) ++{ ++ write_reg_dma(this, NAND_FLASH_CMD, 3); ++ write_reg_dma(this, NAND_DEV0_CFG0, 3); ++ write_reg_dma(this, NAND_EBI2_ECC_BUF_CFG, 1); ++} ++ ++static void config_cw_write_post(struct qcom_nandc_data *this) ++{ ++ write_reg_dma(this, NAND_EXEC_CMD, 1); ++ ++ read_reg_dma(this, NAND_FLASH_STATUS, 1); ++ ++ write_reg_dma(this, NAND_FLASH_STATUS, 1); ++ write_reg_dma(this, NAND_READ_STATUS, 1); ++} ++ ++/* ++ * the following functions are used within chip->cmdfunc() to perform different ++ * NAND_CMD_* commands ++ */ ++ ++/* sets up descriptors for NAND_CMD_PARAM */ ++static int nandc_param(struct qcom_nandc_data *this) ++{ ++ struct nandc_regs *regs = this->regs; ++ ++ /* ++ * NAND_CMD_PARAM is called before we know much about the FLASH chip ++ * in use. we configure the controller to perform a raw read of 512 ++ * bytes to read onfi params ++ */ ++ regs->cmd = PAGE_READ | PAGE_ACC | LAST_PAGE; ++ regs->addr0 = 0; ++ regs->addr1 = 0; ++ regs->cfg0 = 0 << CW_PER_PAGE ++ | 512 << UD_SIZE_BYTES ++ | 5 << NUM_ADDR_CYCLES ++ | 0 << SPARE_SIZE_BYTES; ++ ++ regs->cfg1 = 7 << NAND_RECOVERY_CYCLES ++ | 0 << CS_ACTIVE_BSY ++ | 17 << BAD_BLOCK_BYTE_NUM ++ | 1 << BAD_BLOCK_IN_SPARE_AREA ++ | 2 << WR_RD_BSY_GAP ++ | 0 << WIDE_FLASH ++ | 1 << DEV0_CFG1_ECC_DISABLE; ++ ++ regs->ecc_bch_cfg = 1 << ECC_CFG_ECC_DISABLE; ++ ++ /* configure CMD1 and VLD for ONFI param probing */ ++ regs->vld = (this->vld & ~(1 << READ_START_VLD)) ++ | 0 << READ_START_VLD; ++ ++ regs->cmd1 = (this->cmd1 & ~(0xFF << READ_ADDR)) ++ | NAND_CMD_PARAM << READ_ADDR; ++ ++ regs->exec = 1; ++ ++ regs->orig_cmd1 = this->cmd1; ++ regs->orig_vld = this->vld; ++ ++ write_reg_dma(this, NAND_DEV_CMD_VLD, 1); ++ write_reg_dma(this, NAND_DEV_CMD1, 1); ++ ++ this->buf_count = 512; ++ memset(this->data_buffer, 0xff, this->buf_count); ++ ++ config_cw_read(this); ++ ++ read_data_dma(this, FLASH_BUF_ACC, this->data_buffer, this->buf_count); ++ ++ /* restore CMD1 and VLD regs */ ++ write_reg_dma(this, NAND_DEV_CMD1_RESTORE, 1); ++ write_reg_dma(this, NAND_DEV_CMD_VLD_RESTORE, 1); ++ ++ return 0; ++} ++ ++/* sets up descriptors for NAND_CMD_ERASE1 */ ++static int erase_block(struct qcom_nandc_data *this, int page_addr) ++{ ++ struct nandc_regs *regs = this->regs; ++ ++ regs->cmd = BLOCK_ERASE | PAGE_ACC | LAST_PAGE; ++ regs->addr0 = page_addr; ++ regs->addr1 = 0; ++ regs->cfg0 = this->cfg0_raw & ~(7 << CW_PER_PAGE); ++ regs->cfg1 = this->cfg1_raw; ++ regs->exec = 1; ++ regs->clrflashstatus = this->clrflashstatus; ++ regs->clrreadstatus = this->clrreadstatus; ++ ++ write_reg_dma(this, NAND_FLASH_CMD, 3); ++ write_reg_dma(this, NAND_DEV0_CFG0, 2); ++ write_reg_dma(this, NAND_EXEC_CMD, 1); ++ ++ read_reg_dma(this, NAND_FLASH_STATUS, 1); ++ ++ write_reg_dma(this, NAND_FLASH_STATUS, 1); ++ write_reg_dma(this, NAND_READ_STATUS, 1); ++ ++ return 0; ++} ++ ++/* sets up descriptors for NAND_CMD_READID */ ++static int read_id(struct qcom_nandc_data *this, int column) ++{ ++ struct nandc_regs *regs = this->regs; ++ ++ if (column == -1) ++ return 0; ++ ++ regs->cmd = FETCH_ID; ++ regs->addr0 = column; ++ regs->addr1 = 0; ++ regs->chip_sel = DM_EN; ++ regs->exec = 1; ++ ++ write_reg_dma(this, NAND_FLASH_CMD, 4); ++ write_reg_dma(this, NAND_EXEC_CMD, 1); ++ ++ read_reg_dma(this, NAND_READ_ID, 1); ++ ++ return 0; ++} ++ ++/* sets up descriptors for NAND_CMD_RESET */ ++static int reset(struct qcom_nandc_data *this) ++{ ++ struct nandc_regs *regs = this->regs; ++ ++ regs->cmd = RESET_DEVICE; ++ regs->exec = 1; ++ ++ write_reg_dma(this, NAND_FLASH_CMD, 1); ++ write_reg_dma(this, NAND_EXEC_CMD, 1); ++ ++ read_reg_dma(this, NAND_FLASH_STATUS, 1); ++ ++ return 0; ++} ++ ++/* helpers to submit/free our list of dma descriptors */ ++static void dma_callback(void *param) ++{ ++ struct qcom_nandc_data *this = param; ++ struct completion *c = &this->dma_done; ++ ++ complete(c); ++} ++ ++static int submit_descs(struct qcom_nandc_data *this) ++{ ++ struct completion *c = &this->dma_done; ++ struct desc_info *desc; ++ int r; ++ ++ init_completion(c); ++ ++ list_for_each_entry(desc, &this->list, list) { ++ /* ++ * we add a callback to the last descriptor in our list to ++ * notify completion of command ++ */ ++ if (list_is_last(&desc->list, &this->list)) { ++ desc->dma_desc->callback = dma_callback; ++ desc->dma_desc->callback_param = this; ++ } ++ ++ dmaengine_submit(desc->dma_desc); ++ } ++ ++ dma_async_issue_pending(this->chan); ++ ++ r = wait_for_completion_timeout(c, msecs_to_jiffies(500)); ++ if (!r) ++ return -ETIMEDOUT; ++ ++ return 0; ++} ++ ++static void free_descs(struct qcom_nandc_data *this) ++{ ++ struct desc_info *desc, *n; ++ ++ list_for_each_entry_safe(desc, n, &this->list, list) { ++ list_del(&desc->list); ++ dma_unmap_sg(this->dev, &desc->sgl, 1, desc->dir); ++ kfree(desc); ++ } ++} ++ ++/* reset the register read buffer for next NAND operation */ ++static void clear_read_regs(struct qcom_nandc_data *this) ++{ ++ this->reg_read_pos = 0; ++ memset(this->reg_read_buf, 0, MAX_REG_RD * sizeof(*this->reg_read_buf)); ++} ++ ++static void pre_command(struct qcom_nandc_data *this, int command) ++{ ++ this->buf_count = 0; ++ this->buf_start = 0; ++ this->use_ecc = false; ++ this->last_command = command; ++ ++ clear_read_regs(this); ++} ++ ++/* ++ * this is called after NAND_CMD_PAGEPROG and NAND_CMD_ERASE1 to set our ++ * privately maintained status byte, this status byte can be read after ++ * NAND_CMD_STATUS is called ++ */ ++static void parse_erase_write_errors(struct qcom_nandc_data *this, int command) ++{ ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int num_cw; ++ int i; ++ ++ num_cw = command == NAND_CMD_PAGEPROG ? ecc->steps : 1; ++ ++ for (i = 0; i < num_cw; i++) { ++ __le32 flash_status = le32_to_cpu(this->reg_read_buf[i]); ++ ++ if (flash_status & FS_MPU_ERR) ++ this->status &= ~NAND_STATUS_WP; ++ ++ if (flash_status & FS_OP_ERR || (i == (num_cw - 1) && ++ (flash_status & FS_DEVICE_STS_ERR))) ++ this->status |= NAND_STATUS_FAIL; ++ } ++} ++ ++static void post_command(struct qcom_nandc_data *this, int command) ++{ ++ switch (command) { ++ case NAND_CMD_READID: ++ memcpy(this->data_buffer, this->reg_read_buf, this->buf_count); ++ break; ++ case NAND_CMD_PAGEPROG: ++ case NAND_CMD_ERASE1: ++ parse_erase_write_errors(this, command); ++ break; ++ default: ++ break; ++ } ++} ++ ++/* ++ * Implements chip->cmdfunc. It's only used for a limited set of commands. ++ * The rest of the commands wouldn't be called by upper layers. For example, ++ * NAND_CMD_READOOB would never be called because we have our own versions ++ * of read_oob ops for nand_ecc_ctrl. ++ */ ++static void qcom_nandc_command(struct mtd_info *mtd, unsigned int command, ++ int column, int page_addr) ++{ ++ struct nand_chip *chip = mtd->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ struct qcom_nandc_data *this = chip->priv; ++ bool wait = false; ++ int r = 0; ++ ++ pre_command(this, command); ++ ++ switch (command) { ++ case NAND_CMD_RESET: ++ r = reset(this); ++ wait = true; ++ break; ++ ++ case NAND_CMD_READID: ++ this->buf_count = 4; ++ r = read_id(this, column); ++ wait = true; ++ break; ++ ++ case NAND_CMD_PARAM: ++ r = nandc_param(this); ++ wait = true; ++ break; ++ ++ case NAND_CMD_ERASE1: ++ r = erase_block(this, page_addr); ++ wait = true; ++ break; ++ ++ case NAND_CMD_READ0: ++ /* we read the entire page for now */ ++ WARN_ON(column != 0); ++ ++ this->use_ecc = true; ++ set_address(this, 0, page_addr); ++ update_rw_regs(this, ecc->steps, true); ++ break; ++ ++ case NAND_CMD_SEQIN: ++ WARN_ON(column != 0); ++ set_address(this, 0, page_addr); ++ break; ++ ++ case NAND_CMD_PAGEPROG: ++ case NAND_CMD_STATUS: ++ case NAND_CMD_NONE: ++ default: ++ break; ++ } ++ ++ if (r) { ++ dev_err(this->dev, "failure executing command %d\n", ++ command); ++ free_descs(this); ++ return; ++ } ++ ++ if (wait) { ++ r = submit_descs(this); ++ if (r) ++ dev_err(this->dev, ++ "failure submitting descs for command %d\n", ++ command); ++ } ++ ++ free_descs(this); ++ ++ post_command(this, command); ++} ++ ++/* ++ * when using RS ECC, the NAND controller flags an error when reading an ++ * erased page. however, there are special characters at certain offsets when ++ * we read the erased page. we check here if the page is really empty. if so, ++ * we replace the magic characters with 0xffs ++ */ ++static bool empty_page_fixup(struct qcom_nandc_data *this, u8 *data_buf) ++{ ++ struct mtd_info *mtd = &this->mtd; ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int cwperpage = ecc->steps; ++ u8 orig1[MAX_NUM_STEPS], orig2[MAX_NUM_STEPS]; ++ int i, j; ++ ++ /* if BCH is enabled, HW will take care of detecting erased pages */ ++ if (this->bch_enabled || !this->use_ecc) ++ return false; ++ ++ for (i = 0; i < cwperpage; i++) { ++ u8 *empty1, *empty2; ++ __le32 flash_status = le32_to_cpu(this->reg_read_buf[3 * i]); ++ ++ /* ++ * an erased page flags an error in NAND_FLASH_STATUS, check if ++ * the page is erased by looking for 0x54s at offsets 3 and 175 ++ * from the beginning of each codeword ++ */ ++ if (!(flash_status & FS_OP_ERR)) ++ break; ++ ++ empty1 = &data_buf[3 + i * this->cw_data]; ++ empty2 = &data_buf[175 + i * this->cw_data]; ++ ++ /* ++ * if the error wasn't because of an erased page, bail out and ++ * and let someone else do the error checking ++ */ ++ if ((*empty1 == 0x54 && *empty2 == 0xff) || ++ (*empty1 == 0xff && *empty2 == 0x54)) { ++ orig1[i] = *empty1; ++ orig2[i] = *empty2; ++ ++ *empty1 = 0xff; ++ *empty2 = 0xff; ++ } else { ++ break; ++ } ++ } ++ ++ if (i < cwperpage || memchr_inv(data_buf, 0xff, mtd->writesize)) ++ goto not_empty; ++ ++ /* ++ * tell the caller that the page was empty and is fixed up, so that ++ * parse_read_errors() doesn't think it's an error ++ */ ++ return true; ++ ++not_empty: ++ /* restore original values if not empty*/ ++ for (j = 0; j < i; j++) { ++ data_buf[3 + j * this->cw_data] = orig1[j]; ++ data_buf[175 + j * this->cw_data] = orig2[j]; ++ } ++ ++ return false; ++} ++ ++struct read_stats { ++ __le32 flash; ++ __le32 buffer; ++ __le32 erased_cw; ++}; ++ ++/* ++ * reads back status registers set by the controller to notify page read ++ * errors. this is equivalent to what 'ecc->correct()' would do. ++ */ ++static int parse_read_errors(struct qcom_nandc_data *this, bool erased_page) ++{ ++ struct mtd_info *mtd = &this->mtd; ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int cwperpage = ecc->steps; ++ unsigned int max_bitflips = 0; ++ int i; ++ ++ for (i = 0; i < cwperpage; i++) { ++ int stat; ++ struct read_stats *buf; ++ ++ buf = (struct read_stats *) (this->reg_read_buf + 3 * i); ++ ++ buf->flash = le32_to_cpu(buf->flash); ++ buf->buffer = le32_to_cpu(buf->buffer); ++ buf->erased_cw = le32_to_cpu(buf->erased_cw); ++ ++ if (buf->flash & (FS_OP_ERR | FS_MPU_ERR)) { ++ ++ /* ignore erased codeword errors */ ++ if (this->bch_enabled) { ++ if ((buf->erased_cw & ERASED_CW) == ERASED_CW) ++ continue; ++ } else if (erased_page) { ++ continue; ++ } ++ ++ if (buf->buffer & BS_UNCORRECTABLE_BIT) { ++ mtd->ecc_stats.failed++; ++ continue; ++ } ++ } ++ ++ stat = buf->buffer & BS_CORRECTABLE_ERR_MSK; ++ mtd->ecc_stats.corrected += stat; ++ ++ max_bitflips = max_t(unsigned int, max_bitflips, stat); ++ } ++ ++ return max_bitflips; ++} ++ ++/* ++ * helper to perform the actual page read operation, used by ecc->read_page() ++ * and ecc->read_oob() ++ */ ++static int read_page_low(struct qcom_nandc_data *this, u8 *data_buf, ++ u8 *oob_buf) ++{ ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int i, r; ++ ++ /* queue cmd descs for each codeword */ ++ for (i = 0; i < ecc->steps; i++) { ++ int data_size, oob_size; ++ ++ if (i == (ecc->steps - 1)) { ++ data_size = ecc->size - ((ecc->steps - 1) << 2); ++ oob_size = (ecc->steps << 2) + ecc->bytes; ++ } else { ++ data_size = this->cw_data; ++ oob_size = ecc->bytes; ++ } ++ ++ config_cw_read(this); ++ ++ if (data_buf) ++ read_data_dma(this, FLASH_BUF_ACC, data_buf, data_size); ++ ++ if (oob_buf) ++ read_data_dma(this, FLASH_BUF_ACC + data_size, oob_buf, ++ oob_size); ++ ++ if (data_buf) ++ data_buf += data_size; ++ if (oob_buf) ++ oob_buf += oob_size; ++ } ++ ++ r = submit_descs(this); ++ if (r) ++ dev_err(this->dev, "failure to read page/oob\n"); ++ ++ free_descs(this); ++ ++ return r; ++} ++ ++/* ++ * a helper that copies the last step/codeword of a page (containing free oob) ++ * into our local buffer ++ */ ++static int copy_last_cw(struct qcom_nandc_data *this, bool use_ecc, int page) ++{ ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int size; ++ int r; ++ ++ clear_read_regs(this); ++ ++ size = use_ecc ? this->cw_data : this->cw_size; ++ ++ /* prepare a clean read buffer */ ++ memset(this->data_buffer, 0xff, size); ++ ++ this->use_ecc = use_ecc; ++ set_address(this, this->cw_size * (ecc->steps - 1), page); ++ update_rw_regs(this, 1, true); ++ ++ config_cw_read(this); ++ ++ read_data_dma(this, FLASH_BUF_ACC, this->data_buffer, size); ++ ++ r = submit_descs(this); ++ if (r) ++ dev_err(this->dev, "failed to copy last codeword\n"); ++ ++ free_descs(this); ++ ++ return r; ++} ++ ++/* implements ecc->read_page() */ ++static int qcom_nandc_read_page(struct mtd_info *mtd, struct nand_chip *chip, ++ uint8_t *buf, int oob_required, int page) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ u8 *data_buf, *oob_buf = NULL; ++ bool erased_page; ++ int r; ++ ++ data_buf = buf; ++ oob_buf = oob_required ? chip->oob_poi : NULL; ++ ++ r = read_page_low(this, data_buf, oob_buf); ++ if (r) { ++ dev_err(this->dev, "failure to read page\n"); ++ return r; ++ } ++ ++ erased_page = empty_page_fixup(this, data_buf); ++ ++ return parse_read_errors(this, erased_page); ++} ++ ++/* implements ecc->read_oob() */ ++static int qcom_nandc_read_oob(struct mtd_info *mtd, struct nand_chip *chip, ++ int page) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int r; ++ ++ clear_read_regs(this); ++ ++ this->use_ecc = true; ++ set_address(this, 0, page); ++ update_rw_regs(this, ecc->steps, true); ++ ++ r = read_page_low(this, NULL, chip->oob_poi); ++ if (r) ++ dev_err(this->dev, "failure to read oob\n"); ++ ++ return r; ++} ++ ++/* implements ecc->read_oob_raw(), used to read the bad block marker flag */ ++static int qcom_nandc_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip, ++ int page) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ uint8_t *oob = chip->oob_poi; ++ int start, length; ++ int r; ++ ++ /* ++ * configure registers for a raw page read, the address is set to the ++ * beginning of the last codeword, we don't care about reading ecc ++ * portion of oob, just the free stuff ++ */ ++ r = copy_last_cw(this, false, page); ++ if (r) ++ return r; ++ ++ /* ++ * reading raw oob has 2 parts, first the bad block byte, then the ++ * actual free oob region. perform a memcpy in two steps ++ */ ++ start = mtd->writesize - (this->cw_size * (ecc->steps - 1)); ++ length = chip->options & NAND_BUSWIDTH_16 ? 2 : 1; ++ ++ memcpy(oob, this->data_buffer + start, length); ++ ++ oob += length; ++ ++ start = this->cw_data - (ecc->steps << 2) + 1; ++ length = ecc->steps << 2; ++ ++ memcpy(oob, this->data_buffer + start, length); ++ ++ return 0; ++} ++ ++/* implements ecc->write_page() */ ++static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip, ++ const uint8_t *buf, int oob_required) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ u8 *data_buf, *oob_buf; ++ int i, r = 0; ++ ++ clear_read_regs(this); ++ ++ data_buf = (u8 *) buf; ++ oob_buf = chip->oob_poi; ++ ++ this->use_ecc = true; ++ update_rw_regs(this, ecc->steps, false); ++ ++ for (i = 0; i < ecc->steps; i++) { ++ int data_size, oob_size; ++ ++ if (i == (ecc->steps - 1)) { ++ data_size = ecc->size - ((ecc->steps - 1) << 2); ++ oob_size = (ecc->steps << 2) + ecc->bytes; ++ } else { ++ data_size = this->cw_data; ++ oob_size = ecc->bytes; ++ } ++ ++ config_cw_write_pre(this); ++ write_data_dma(this, FLASH_BUF_ACC, data_buf, data_size); ++ ++ /* ++ * we don't really need to write anything to oob for the ++ * first n - 1 codewords since these oob regions just ++ * contain ecc that's written by the controller itself ++ */ ++ if (i == (ecc->steps - 1)) ++ write_data_dma(this, FLASH_BUF_ACC + data_size, ++ oob_buf, oob_size); ++ config_cw_write_post(this); ++ ++ data_buf += data_size; ++ oob_buf += oob_size; ++ } ++ ++ r = submit_descs(this); ++ if (r) ++ dev_err(this->dev, "failure to write page\n"); ++ ++ free_descs(this); ++ ++ return r; ++} ++ ++/* ++ * implements ecc->write_oob() ++ * ++ * the NAND controller cannot write only data or only oob within a codeword, ++ * since ecc is calculated for the combined codeword. we first copy the ++ * entire contents for the last codeword(data + oob), replace the old oob ++ * with the new one in chip->oob_poi, and then write the entire codeword. ++ * this read-copy-write operation results in a slight perormance loss. ++ */ ++static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, ++ int page) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ uint8_t *oob = chip->oob_poi; ++ int free_boff; ++ int data_size, oob_size; ++ int r, status = 0; ++ ++ r = copy_last_cw(this, true, page); ++ if (r) ++ return r; ++ ++ clear_read_regs(this); ++ ++ /* calculate the data and oob size for the last codeword/step */ ++ data_size = ecc->size - ((ecc->steps - 1) << 2); ++ oob_size = (ecc->steps << 2) + ecc->bytes; ++ ++ /* ++ * the location of spare data in the oob buffer, we could also use ++ * ecc->layout.oobfree here ++ */ ++ free_boff = ecc->bytes * (ecc->steps - 1); ++ ++ /* override new oob content to last codeword */ ++ memcpy(this->data_buffer + data_size, oob + free_boff, oob_size); ++ ++ this->use_ecc = true; ++ set_address(this, this->cw_size * (ecc->steps - 1), page); ++ update_rw_regs(this, 1, false); ++ ++ config_cw_write_pre(this); ++ write_data_dma(this, FLASH_BUF_ACC, this->data_buffer, ++ data_size + oob_size); ++ config_cw_write_post(this); ++ ++ r = submit_descs(this); ++ ++ free_descs(this); ++ ++ if (r) { ++ dev_err(this->dev, "failure to write oob\n"); ++ return -EIO; ++ } ++ ++ chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); ++ ++ status = chip->waitfunc(mtd, chip); ++ ++ return status & NAND_STATUS_FAIL ? -EIO : 0; ++} ++ ++/* implements ecc->write_oob_raw(), used to write bad block marker flag */ ++static int qcom_nandc_write_oob_raw(struct mtd_info *mtd, ++ struct nand_chip *chip, int page) ++{ ++ struct qcom_nandc_data *this = chip->priv; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ uint8_t *oob = chip->oob_poi; ++ int start, length; ++ int r, status = 0; ++ ++ r = copy_last_cw(this, false, page); ++ if (r) ++ return r; ++ ++ clear_read_regs(this); ++ ++ /* ++ * writing raw oob has 2 parts, first the bad block region, then the ++ * actual free region ++ */ ++ start = mtd->writesize - (this->cw_size * (ecc->steps - 1)); ++ length = chip->options & NAND_BUSWIDTH_16 ? 2 : 1; ++ ++ memcpy(this->data_buffer + start, oob, length); ++ ++ oob += length; ++ ++ start = this->cw_data - (ecc->steps << 2) + 1; ++ length = ecc->steps << 2; ++ ++ memcpy(this->data_buffer + start, oob, length); ++ ++ /* prepare write */ ++ this->use_ecc = false; ++ set_address(this, this->cw_size * (ecc->steps - 1), page); ++ update_rw_regs(this, 1, false); ++ ++ config_cw_write_pre(this); ++ write_data_dma(this, FLASH_BUF_ACC, this->data_buffer, this->cw_size); ++ config_cw_write_post(this); ++ ++ r = submit_descs(this); ++ ++ free_descs(this); ++ ++ if (r) { ++ dev_err(this->dev, "failure to write updated oob\n"); ++ return -EIO; ++ } ++ ++ chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); ++ ++ status = chip->waitfunc(mtd, chip); ++ ++ return status & NAND_STATUS_FAIL ? -EIO : 0; ++} ++ ++/* ++ * the three functions below implement chip->read_byte(), chip->read_buf() ++ * and chip->write_buf() respectively. these aren't used for ++ * reading/writing page data, they are used for smaller data like reading ++ * id, status etc ++ */ ++static uint8_t qcom_nandc_read_byte(struct mtd_info *mtd) ++{ ++ struct nand_chip *chip = mtd->priv; ++ struct qcom_nandc_data *this = chip->priv; ++ uint8_t *buf = this->data_buffer; ++ uint8_t ret = 0x0; ++ ++ if (this->last_command == NAND_CMD_STATUS) { ++ ret = this->status; ++ ++ this->status = NAND_STATUS_READY | NAND_STATUS_WP; ++ ++ return ret; ++ } ++ ++ if (this->buf_start < this->buf_count) ++ ret = buf[this->buf_start++]; ++ ++ return ret; ++} ++ ++static void qcom_nandc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) ++{ ++ struct nand_chip *chip = mtd->priv; ++ struct qcom_nandc_data *this = chip->priv; ++ int real_len = min_t(size_t, len, this->buf_count - this->buf_start); ++ ++ memcpy(buf, this->data_buffer + this->buf_start, real_len); ++ this->buf_start += real_len; ++} ++ ++static void qcom_nandc_write_buf(struct mtd_info *mtd, const uint8_t *buf, ++ int len) ++{ ++ struct nand_chip *chip = mtd->priv; ++ struct qcom_nandc_data *this = chip->priv; ++ int real_len = min_t(size_t, len, this->buf_count - this->buf_start); ++ ++ memcpy(this->data_buffer + this->buf_start, buf, real_len); ++ ++ this->buf_start += real_len; ++} ++ ++/* we support only one external chip for now */ ++static void qcom_nandc_select_chip(struct mtd_info *mtd, int chipnr) ++{ ++ struct nand_chip *chip = mtd->priv; ++ struct qcom_nandc_data *this = chip->priv; ++ ++ if (chipnr <= 0) ++ return; ++ ++ dev_warn(this->dev, "invalid chip select\n"); ++} ++ ++/* ++ * NAND controller page layout info ++ * ++ * |-----------------------| |---------------------------------| ++ * | xx.......xx| | *********xx.......xx| ++ * | DATA xx..ECC..xx| | DATA **SPARE**xx..ECC..xx| ++ * | (516) xx.......xx| | (516-n*4) **(n*4)**xx.......xx| ++ * | xx.......xx| | *********xx.......xx| ++ * |-----------------------| |---------------------------------| ++ * codeword 1,2..n-1 codeword n ++ * <---(528/532 Bytes)----> <-------(528/532 Bytes)----------> ++ * ++ * n = number of codewords in the page ++ * . = ECC bytes ++ * * = spare bytes ++ * x = unused/reserved bytes ++ * ++ * 2K page: n = 4, spare = 16 bytes ++ * 4K page: n = 8, spare = 32 bytes ++ * 8K page: n = 16, spare = 64 bytes ++ * ++ * the qcom nand controller operates at a sub page/codeword level. each ++ * codeword is 528 and 532 bytes for 4 bit and 8 bit ECC modes respectively. ++ * the number of ECC bytes vary based on the ECC strength and the bus width. ++ * ++ * the first n - 1 codewords contains 516 bytes of user data, the remaining ++ * 12/16 bytes consist of ECC and reserved data. The nth codeword contains ++ * both user data and spare(oobavail) bytes that sum up to 516 bytes. ++ * ++ * the layout described above is used by the controller when the ECC block is ++ * enabled. When we read a page with ECC enabled, the unused/reserved bytes are ++ * skipped and not copied to our internal buffer. therefore, the nand_ecclayout ++ * layouts defined below doesn't consider the positions occupied by the reserved ++ * bytes ++ * ++ * when the ECC block is disabled, one unused byte (or two for 16 bit bus width) ++ * in the last codeword is the position of bad block marker. the bad block ++ * marker cannot be accessed when ECC is enabled. ++ * ++ */ ++ ++/* ++ * Layouts for different page sizes and ecc modes. We skip the eccpos field ++ * since it isn't needed for this driver ++ */ ++ ++/* 2K page, 4 bit ECC */ ++static struct nand_ecclayout layout_oob_64 = { ++ .eccbytes = 40, ++ .oobfree = { ++ { 30, 16 }, ++ }, ++}; ++ ++/* 4K page, 4 bit ECC, 8/16 bit bus width */ ++static struct nand_ecclayout layout_oob_128 = { ++ .eccbytes = 80, ++ .oobfree = { ++ { 70, 32 }, ++ }, ++}; ++ ++/* 4K page, 8 bit ECC, 8 bit bus width */ ++static struct nand_ecclayout layout_oob_224_x8 = { ++ .eccbytes = 104, ++ .oobfree = { ++ { 91, 32 }, ++ }, ++}; ++ ++/* 4K page, 8 bit ECC, 16 bit bus width */ ++static struct nand_ecclayout layout_oob_224_x16 = { ++ .eccbytes = 112, ++ .oobfree = { ++ { 98, 32 }, ++ }, ++}; ++ ++/* 8K page, 4 bit ECC, 8/16 bit bus width */ ++static struct nand_ecclayout layout_oob_256 = { ++ .eccbytes = 160, ++ .oobfree = { ++ { 151, 64 }, ++ }, ++}; ++ ++/* ++ * this is called before scan_ident, we do some minimal configurations so ++ * that reading ID and ONFI params work ++ */ ++static void qcom_nandc_pre_init(struct qcom_nandc_data *this) ++{ ++ /* kill onenand */ ++ nandc_write(this, SFLASHC_BURST_CFG, 0); ++ ++ /* enable ADM DMA */ ++ nandc_write(this, NAND_FLASH_CHIP_SELECT, DM_EN); ++ ++ /* save the original values of these registers */ ++ this->cmd1 = nandc_read(this, NAND_DEV_CMD1); ++ this->vld = nandc_read(this, NAND_DEV_CMD_VLD); ++ ++ /* initial status value */ ++ this->status = NAND_STATUS_READY | NAND_STATUS_WP; ++} ++ ++static int qcom_nandc_ecc_init(struct qcom_nandc_data *this) ++{ ++ struct mtd_info *mtd = &this->mtd; ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int cwperpage; ++ bool wide_bus; ++ ++ /* the nand controller fetches codewords/chunks of 512 bytes */ ++ cwperpage = mtd->writesize >> 9; ++ ++ ecc->strength = this->ecc_strength; ++ ++ wide_bus = chip->options & NAND_BUSWIDTH_16 ? true : false; ++ ++ if (ecc->strength >= 8) { ++ /* 8 bit ECC defaults to BCH ECC on all platforms */ ++ ecc->bytes = wide_bus ? 14 : 13; ++ } else { ++ /* ++ * if the controller supports BCH for 4 bit ECC, the controller ++ * uses lesser bytes for ECC. If RS is used, the ECC bytes is ++ * always 10 bytes ++ */ ++ if (this->ecc_modes & ECC_BCH_4BIT) ++ ecc->bytes = wide_bus ? 8 : 7; ++ else ++ ecc->bytes = 10; ++ } ++ ++ /* each step consists of 512 bytes of data */ ++ ecc->size = NANDC_STEP_SIZE; ++ ++ ecc->read_page = qcom_nandc_read_page; ++ ecc->read_oob = qcom_nandc_read_oob; ++ ecc->write_page = qcom_nandc_write_page; ++ ecc->write_oob = qcom_nandc_write_oob; ++ ++ /* ++ * the bad block marker is readable only when we read the page with ECC ++ * disabled. all the ops above run with ECC enabled. We need raw read ++ * and write function for oob in order to access bad block marker. ++ */ ++ ecc->read_oob_raw = qcom_nandc_read_oob_raw; ++ ecc->write_oob_raw = qcom_nandc_write_oob_raw; ++ ++ switch (mtd->oobsize) { ++ case 64: ++ ecc->layout = &layout_oob_64; ++ break; ++ case 128: ++ ecc->layout = &layout_oob_128; ++ break; ++ case 224: ++ if (wide_bus) ++ ecc->layout = &layout_oob_224_x16; ++ else ++ ecc->layout = &layout_oob_224_x8; ++ break; ++ case 256: ++ ecc->layout = &layout_oob_256; ++ break; ++ default: ++ dev_err(this->dev, "unsupported NAND device, oobsize %d\n", ++ mtd->oobsize); ++ return -ENODEV; ++ } ++ ++ ecc->mode = NAND_ECC_HW; ++ ++ /* enable ecc by default */ ++ this->use_ecc = true; ++ ++ return 0; ++} ++ ++static void qcom_nandc_hw_post_init(struct qcom_nandc_data *this) ++{ ++ struct mtd_info *mtd = &this->mtd; ++ struct nand_chip *chip = &this->chip; ++ struct nand_ecc_ctrl *ecc = &chip->ecc; ++ int cwperpage = mtd->writesize / ecc->size; ++ int spare_bytes, bad_block_byte; ++ bool wide_bus; ++ int ecc_mode = 0; ++ ++ wide_bus = chip->options & NAND_BUSWIDTH_16 ? true : false; ++ ++ if (ecc->strength >= 8) { ++ this->cw_size = 532; ++ ++ spare_bytes = wide_bus ? 0 : 2; ++ ++ this->bch_enabled = true; ++ ecc_mode = 1; ++ } else { ++ this->cw_size = 528; ++ ++ if (this->ecc_modes & ECC_BCH_4BIT) { ++ spare_bytes = wide_bus ? 2 : 4; ++ ++ this->bch_enabled = true; ++ ecc_mode = 0; ++ } else { ++ spare_bytes = wide_bus ? 0 : 1; ++ } ++ } ++ ++ /* ++ * DATA_UD_BYTES varies based on whether the read/write command protects ++ * spare data with ECC too. We protect spare data by default, so we set ++ * it to main + spare data, which are 512 and 4 bytes respectively. ++ */ ++ this->cw_data = 516; ++ ++ bad_block_byte = mtd->writesize - this->cw_size * (cwperpage - 1) + 1; ++ ++ this->cfg0 = (cwperpage - 1) << CW_PER_PAGE ++ | this->cw_data << UD_SIZE_BYTES ++ | 0 << DISABLE_STATUS_AFTER_WRITE ++ | 5 << NUM_ADDR_CYCLES ++ | ecc->bytes << ECC_PARITY_SIZE_BYTES_RS ++ | 0 << STATUS_BFR_READ ++ | 1 << SET_RD_MODE_AFTER_STATUS ++ | spare_bytes << SPARE_SIZE_BYTES; ++ ++ this->cfg1 = 7 << NAND_RECOVERY_CYCLES ++ | 0 << CS_ACTIVE_BSY ++ | bad_block_byte << BAD_BLOCK_BYTE_NUM ++ | 0 << BAD_BLOCK_IN_SPARE_AREA ++ | 2 << WR_RD_BSY_GAP ++ | wide_bus << WIDE_FLASH ++ | this->bch_enabled << ENABLE_BCH_ECC; ++ ++ this->cfg0_raw = (cwperpage - 1) << CW_PER_PAGE ++ | this->cw_size << UD_SIZE_BYTES ++ | 5 << NUM_ADDR_CYCLES ++ | 0 << SPARE_SIZE_BYTES; ++ ++ this->cfg1_raw = 7 << NAND_RECOVERY_CYCLES ++ | 0 << CS_ACTIVE_BSY ++ | 17 << BAD_BLOCK_BYTE_NUM ++ | 1 << BAD_BLOCK_IN_SPARE_AREA ++ | 2 << WR_RD_BSY_GAP ++ | wide_bus << WIDE_FLASH ++ | 1 << DEV0_CFG1_ECC_DISABLE; ++ ++ this->ecc_bch_cfg = this->bch_enabled << ECC_CFG_ECC_DISABLE ++ | 0 << ECC_SW_RESET ++ | this->cw_data << ECC_NUM_DATA_BYTES ++ | 1 << ECC_FORCE_CLK_OPEN ++ | ecc_mode << ECC_MODE ++ | ecc->bytes << ECC_PARITY_SIZE_BYTES_BCH; ++ ++ this->ecc_buf_cfg = 0x203 << NUM_STEPS; ++ ++ this->clrflashstatus = FS_READY_BSY_N; ++ this->clrreadstatus = 0xc0; ++ ++ dev_dbg(this->dev, ++ "cfg0 %x cfg1 %x ecc_buf_cfg %x ecc_bch cfg %x cw_size %d cw_data %d strength %d parity_bytes %d steps %d\n", ++ this->cfg0, this->cfg1, this->ecc_buf_cfg, ++ this->ecc_bch_cfg, this->cw_size, this->cw_data, ++ ecc->strength, ecc->bytes, cwperpage); ++} ++ ++static int qcom_nandc_alloc(struct qcom_nandc_data *this) ++{ ++ int r; ++ ++ r = dma_set_coherent_mask(this->dev, DMA_BIT_MASK(32)); ++ if (r) { ++ dev_err(this->dev, "failed to set DMA mask\n"); ++ return r; ++ } ++ ++ /* ++ * we use the internal buffer for reading ONFI params, reading small ++ * data like ID and status, and preforming read-copy-write operations ++ * when writing to a codeword partially. 532 is the maximum possible ++ * size of a codeword for our nand controller ++ */ ++ this->buf_size = 532; ++ ++ this->data_buffer = devm_kzalloc(this->dev, this->buf_size, GFP_KERNEL); ++ if (!this->data_buffer) ++ return -ENOMEM; ++ ++ this->regs = devm_kzalloc(this->dev, sizeof(*this->regs), GFP_KERNEL); ++ if (!this->regs) ++ return -ENOMEM; ++ ++ this->reg_read_buf = devm_kzalloc(this->dev, ++ MAX_REG_RD * sizeof(*this->reg_read_buf), ++ GFP_KERNEL); ++ if (!this->reg_read_buf) ++ return -ENOMEM; ++ ++ INIT_LIST_HEAD(&this->list); ++ ++ this->chan = dma_request_slave_channel(this->dev, "rxtx"); ++ if (!this->chan) { ++ dev_err(this->dev, "failed to request slave channel\n"); ++ return -ENODEV; ++ } ++ ++ return 0; ++} ++ ++static void qcom_nandc_unalloc(struct qcom_nandc_data *this) ++{ ++ dma_release_channel(this->chan); ++} ++ ++static int qcom_nandc_init(struct qcom_nandc_data *this) ++{ ++ struct mtd_info *mtd = &this->mtd; ++ struct nand_chip *chip = &this->chip; ++ struct device_node *np = this->dev->of_node; ++ struct mtd_part_parser_data ppdata = { .of_node = np }; ++ int r; ++ ++ mtd->priv = chip; ++ mtd->name = "qcom-nandc"; ++ mtd->owner = THIS_MODULE; ++ ++ chip->priv = this; ++ ++ chip->cmdfunc = qcom_nandc_command; ++ chip->select_chip = qcom_nandc_select_chip; ++ chip->read_byte = qcom_nandc_read_byte; ++ chip->read_buf = qcom_nandc_read_buf; ++ chip->write_buf = qcom_nandc_write_buf; ++ ++ chip->options |= NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER; ++ if (this->bus_width == 16) ++ chip->options |= NAND_BUSWIDTH_16; ++ ++ chip->bbt_options = NAND_BBT_ACCESS_BBM_RAW; ++ if (of_get_nand_on_flash_bbt(np)) ++ chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB; ++ ++ qcom_nandc_pre_init(this); ++ ++ r = nand_scan_ident(mtd, 1, NULL); ++ if (r) ++ return r; ++ ++ r = qcom_nandc_ecc_init(this); ++ if (r) ++ return r; ++ ++ qcom_nandc_hw_post_init(this); ++ ++ r = nand_scan_tail(mtd); ++ if (r) ++ return r; ++ ++ return mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); ++} ++ ++static int qcom_nandc_parse_dt(struct platform_device *pdev) ++{ ++ struct qcom_nandc_data *this = platform_get_drvdata(pdev); ++ struct device_node *np = this->dev->of_node; ++ int r; ++ ++ this->ecc_strength = of_get_nand_ecc_strength(np); ++ if (this->ecc_strength < 0) { ++ dev_warn(this->dev, ++ "incorrect ecc strength, setting to 4 bits/step\n"); ++ this->ecc_strength = 4; ++ } ++ ++ this->bus_width = of_get_nand_bus_width(np); ++ if (this->bus_width < 0) { ++ dev_warn(this->dev, "incorrect bus width, setting to 8\n"); ++ this->bus_width = 8; ++ } ++ ++ r = of_property_read_u32(np, "qcom,cmd-crci", &this->cmd_crci); ++ if (r) { ++ dev_err(this->dev, "command CRCI unspecified\n"); ++ return r; ++ } ++ ++ r = of_property_read_u32(np, "qcom,data-crci", &this->data_crci); ++ if (r) { ++ dev_err(this->dev, "data CRCI unspecified\n"); ++ return r; ++ } ++ ++ return 0; ++} ++ ++static int qcom_nandc_probe(struct platform_device *pdev) ++{ ++ struct qcom_nandc_data *this; ++ const struct of_device_id *match; ++ int r; ++ ++ this = devm_kzalloc(&pdev->dev, sizeof(*this), GFP_KERNEL); ++ if (!this) ++ return -ENOMEM; ++ ++ platform_set_drvdata(pdev, this); ++ ++ this->pdev = pdev; ++ this->dev = &pdev->dev; ++ ++ match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev); ++ if (!match) { ++ dev_err(&pdev->dev, "failed to match device\n"); ++ return -ENODEV; ++ } ++ ++ if (!match->data) { ++ dev_err(&pdev->dev, "failed to get device data\n"); ++ return -ENODEV; ++ } ++ ++ this->ecc_modes = (u32) match->data; ++ ++ this->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ this->base = devm_ioremap_resource(&pdev->dev, this->res); ++ if (IS_ERR(this->base)) ++ return PTR_ERR(this->base); ++ ++ this->core_clk = devm_clk_get(&pdev->dev, "core"); ++ if (IS_ERR(this->core_clk)) ++ return PTR_ERR(this->core_clk); ++ ++ this->aon_clk = devm_clk_get(&pdev->dev, "aon"); ++ if (IS_ERR(this->aon_clk)) ++ return PTR_ERR(this->aon_clk); ++ ++ r = qcom_nandc_parse_dt(pdev); ++ if (r) ++ return r; ++ ++ r = qcom_nandc_alloc(this); ++ if (r) ++ return r; ++ ++ r = clk_prepare_enable(this->core_clk); ++ if (r) ++ goto err_core_clk; ++ ++ r = clk_prepare_enable(this->aon_clk); ++ if (r) ++ goto err_aon_clk; ++ ++ r = qcom_nandc_init(this); ++ if (r) ++ goto err_init; ++ ++ return 0; ++ ++err_init: ++ clk_disable_unprepare(this->aon_clk); ++err_aon_clk: ++ clk_disable_unprepare(this->core_clk); ++err_core_clk: ++ qcom_nandc_unalloc(this); ++ ++ return r; ++} ++ ++static int qcom_nandc_remove(struct platform_device *pdev) ++{ ++ struct qcom_nandc_data *this = platform_get_drvdata(pdev); ++ ++ qcom_nandc_unalloc(this); ++ ++ clk_disable_unprepare(this->aon_clk); ++ clk_disable_unprepare(this->core_clk); ++ ++ return 0; ++} ++ ++#define EBI2_NANDC_ECC_MODES (ECC_RS_4BIT | ECC_BCH_8BIT) ++ ++/* ++ * data will hold a struct pointer containing more differences once we support ++ * more IPs ++ */ ++static const struct of_device_id qcom_nandc_of_match[] = { ++ { .compatible = "qcom,ebi2-nandc", ++ .data = (void *) EBI2_NANDC_ECC_MODES, ++ }, ++ {} ++}; ++MODULE_DEVICE_TABLE(of, qcom_nandc_of_match); ++ ++static struct platform_driver qcom_nandc_driver = { ++ .driver = { ++ .name = "qcom-nandc", ++ .of_match_table = qcom_nandc_of_match, ++ }, ++ .probe = qcom_nandc_probe, ++ .remove = qcom_nandc_remove, ++}; ++module_platform_driver(qcom_nandc_driver); ++ ++MODULE_AUTHOR("Archit Taneja <architt@codeaurora.org>"); ++MODULE_DESCRIPTION("Qualcomm NAND Controller driver"); ++MODULE_LICENSE("GPL v2"); +--- a/drivers/mtd/nand/Makefile ++++ b/drivers/mtd/nand/Makefile +@@ -50,5 +50,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740 + obj-$(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_QCOM) += qcom_nandc.o + + nand-objs := nand_base.o nand_bbt.o nand_timings.o |