Hi Kelvin, On Sat, 28 May 2016 17:54:10 +0800 Keguang Zhang <keguang.zh...@gmail.com> wrote:
> From: Kelvin Cheung <keguang.zh...@gmail.com> > > This patch adds NAND driver for Loongson1B. I think your controller matches Mychaela's "high-level NAND controller" definition [1]. Mychaela, can you confirm the Loongson controller looks like yours? I'll do a detailed review of the code soon. Thanks, Boris [1]http://thread.gmane.org/gmane.linux.drivers.mtd/67346 > > Signed-off-by: Kelvin Cheung <keguang.zh...@gmail.com> > > --- > v3: > Replace __raw_readl/__raw_writel with readl/writel. > Split ls1x_nand into two structures: ls1x_nand_chip and > ls1x_nand_controller. > V2: > Modify the dependency in Kconfig due to the changes of DMA module. > --- > drivers/mtd/nand/Kconfig | 8 + > drivers/mtd/nand/Makefile | 1 + > drivers/mtd/nand/loongson1_nand.c | 555 > ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 564 insertions(+) > create mode 100644 drivers/mtd/nand/loongson1_nand.c > > diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig > index f05e0e9..be20fb8 100644 > --- a/drivers/mtd/nand/Kconfig > +++ b/drivers/mtd/nand/Kconfig > @@ -563,4 +563,12 @@ config MTD_NAND_QCOM > Enables support for NAND flash chips on SoCs containing the EBI2 NAND > controller. This controller is found on IPQ806x SoC. > > +config MTD_NAND_LOONGSON1 > + tristate "Support for Loongson1 SoC NAND controller" > + depends on MACH_LOONGSON32 > + select DMADEVICES > + select LOONGSON1_DMA > + help > + Enables support for NAND Flash on Loongson1 SoC based boards. > + > endif # MTD_NAND > diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile > index f553353..0310c0b 100644 > --- a/drivers/mtd/nand/Makefile > +++ b/drivers/mtd/nand/Makefile > @@ -57,5 +57,6 @@ obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o > obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o > obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/ > obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o > +obj-$(CONFIG_MTD_NAND_LOONGSON1) += loongson1_nand.o > > nand-objs := nand_base.o nand_bbt.o nand_timings.o > diff --git a/drivers/mtd/nand/loongson1_nand.c > b/drivers/mtd/nand/loongson1_nand.c > new file mode 100644 > index 0000000..86831773 > --- /dev/null > +++ b/drivers/mtd/nand/loongson1_nand.c > @@ -0,0 +1,555 @@ > +/* > + * NAND Flash Driver for Loongson 1 SoC > + * > + * Copyright (C) 2015-2016 Zhang, Keguang <keguang.zh...@gmail.com> > + * > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/clk.h> > +#include <linux/dmaengine.h> > +#include <linux/dma-mapping.h> > +#include <linux/mtd/mtd.h> > +#include <linux/mtd/nand.h> > +#include <linux/sizes.h> > + > +#include <nand.h> > + > +/* Loongson 1 NAND Register Definitions */ > +#define NAND_CMD 0x0 > +#define NAND_ADDRL 0x4 > +#define NAND_ADDRH 0x8 > +#define NAND_TIMING 0xc > +#define NAND_IDL 0x10 > +#define NAND_IDH 0x14 > +#define NAND_STATUS 0x14 > +#define NAND_PARAM 0x18 > +#define NAND_OP_NUM 0x1c > +#define NAND_CS_RDY 0x20 > + > +#define NAND_DMA_ADDR 0x40 > + > +/* NAND Command Register Bits */ > +#define OP_DONE BIT(10) > +#define OP_SPARE BIT(9) > +#define OP_MAIN BIT(8) > +#define CMD_STATUS BIT(7) > +#define CMD_RESET BIT(6) > +#define CMD_READID BIT(5) > +#define BLOCKS_ERASE BIT(4) > +#define CMD_ERASE BIT(3) > +#define CMD_WRITE BIT(2) > +#define CMD_READ BIT(1) > +#define CMD_VALID BIT(0) > + > +#define LS1X_NAND_TIMEOUT 20 > + > +/* macros for registers read/write */ > +#define nand_readl(nandc, off) \ > + readl((nandc)->reg_base + (off)) > + > +#define nand_writel(nandc, off, val) \ > + writel((val), (nandc)->reg_base + (off)) > + > +#define set_cmd(nandc, ctrl) \ > + nand_writel(nandc, NAND_CMD, ctrl) > + > +#define start_nand(nandc) \ > + nand_writel(nandc, NAND_CMD, nand_readl(nandc, NAND_CMD) | CMD_VALID) > + > +struct ls1x_nand_chip { > + struct nand_chip chip; > + struct plat_ls1x_nand *pdata; > +}; > + > +struct ls1x_nand_controller { > + struct clk *clk; > + void __iomem *reg_base; > + > + int cmd_ctrl; > + char datareg[8]; > + char *data_ptr; > + > + /* DMA stuff */ > + unsigned char *dma_buf; > + unsigned int buf_off; > + unsigned int buf_len; > + > + /* DMA Engine stuff */ > + unsigned int dma_chan_id; > + struct dma_chan *dma_chan; > + dma_cookie_t dma_cookie; > + struct completion dma_complete; > + void __iomem *dma_desc; > +}; > + > +static inline struct ls1x_nand_chip *to_ls1x_nand_chip(struct mtd_info *mtd) > +{ > + return container_of(mtd_to_nand(mtd), struct ls1x_nand_chip, chip); > +} > + > +static void dma_callback(void *data) > +{ > + struct mtd_info *mtd = (struct mtd_info *)data; > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + struct dma_tx_state state; > + enum dma_status status; > + > + status = > + dmaengine_tx_status(nandc->dma_chan, nandc->dma_cookie, &state); > + if (likely(status == DMA_COMPLETE)) > + dev_dbg(mtd->dev.parent, "DMA complete with cookie=%d\n", > + nandc->dma_cookie); > + else > + dev_err(mtd->dev.parent, "DMA error with cookie=%d\n", > + nandc->dma_cookie); > + > + complete(&nandc->dma_complete); > +} > + > +static int setup_dma(struct mtd_info *mtd) > +{ > + struct ls1x_nand_chip *nand = to_ls1x_nand_chip(mtd); > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + struct dma_slave_config cfg; > + dma_cap_mask_t mask; > + int ret; > + > + if (!nand->pdata->dma_filter) { > + dev_err(mtd->dev.parent, "no DMA filter\n"); > + return -ENOENT; > + } > + > + /* allocate DMA buffer */ > + nandc->dma_buf = devm_kzalloc(mtd->dev.parent, > + mtd->writesize + mtd->oobsize, > + GFP_KERNEL); > + if (!nandc->dma_buf) > + return -ENOMEM; > + > + dma_cap_zero(mask); > + dma_cap_set(DMA_SLAVE, mask); > + nandc->dma_chan = dma_request_channel(mask, nand->pdata->dma_filter, > + &nandc->dma_chan_id); > + if (!nandc->dma_chan) { > + dev_err(mtd->dev.parent, "failed to request DMA channel\n"); > + return -EBUSY; > + } > + dev_info(mtd->dev.parent, "got %s for %s access\n", > + dma_chan_name(nandc->dma_chan), dev_name(mtd->dev.parent)); > + > + cfg.src_addr = CPHYSADDR(nandc->reg_base + NAND_DMA_ADDR); > + cfg.dst_addr = CPHYSADDR(nandc->reg_base + NAND_DMA_ADDR); > + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + ret = dmaengine_slave_config(nandc->dma_chan, &cfg); > + if (ret) { > + dev_err(mtd->dev.parent, "failed to config DMA channel\n"); > + dma_release_channel(nandc->dma_chan); > + return ret; > + } > + > + init_completion(&nandc->dma_complete); > + > + return 0; > +} > + > +static int start_dma(struct mtd_info *mtd, unsigned int len, bool is_write) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + struct dma_chan *chan = nandc->dma_chan; > + struct dma_async_tx_descriptor *desc; > + enum dma_data_direction data_dir = > + is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE; > + enum dma_transfer_direction xfer_dir = > + is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; > + dma_addr_t dma_addr; > + int ret; > + > + dma_addr = > + dma_map_single(chan->device->dev, nandc->dma_buf, len, data_dir); > + if (dma_mapping_error(chan->device->dev, dma_addr)) { > + dev_err(mtd->dev.parent, "failed to map DMA buffer\n"); > + return -ENXIO; > + } > + > + desc = dmaengine_prep_slave_single(chan, dma_addr, len, xfer_dir, > + DMA_PREP_INTERRUPT); > + if (!desc) { > + dev_err(mtd->dev.parent, "failed to prepare DMA descriptor\n"); > + ret = PTR_ERR(desc); > + goto err; > + } > + desc->callback = dma_callback; > + desc->callback_param = mtd; > + > + nandc->dma_cookie = dmaengine_submit(desc); > + ret = dma_submit_error(nandc->dma_cookie); > + if (ret) { > + dev_err(mtd->dev.parent, "failed to submit DMA descriptor\n"); > + goto err; > + } > + > + dev_dbg(mtd->dev.parent, "issue DMA with cookie=%d\n", > + nandc->dma_cookie); > + dma_async_issue_pending(chan); > + > + ret = wait_for_completion_timeout(&nandc->dma_complete, > + msecs_to_jiffies(LS1X_NAND_TIMEOUT)); > + if (ret <= 0) { > + dev_err(mtd->dev.parent, "DMA timeout\n"); > + dmaengine_terminate_all(chan); > + ret = -EIO; > + } > + ret = 0; > +err: > + dma_unmap_single(chan->device->dev, dma_addr, len, data_dir); > + > + return ret; > +} > + > +static void ls1x_nand_select_chip(struct mtd_info *mtd, int chip) > +{ > +} > + > +static int ls1x_nand_dev_ready(struct mtd_info *mtd) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + if (nand_readl(nandc, NAND_CMD) & OP_DONE) > + return 1; > + > + return 0; > +} > + > +static uint8_t ls1x_nand_read_byte(struct mtd_info *mtd) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + return *(nandc->data_ptr++); > +} > + > +static void ls1x_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + int real_len = min_t(size_t, len, nandc->buf_len - nandc->buf_off); > + > + memcpy(buf, nandc->dma_buf + nandc->buf_off, real_len); > + nandc->buf_off += real_len; > +} > + > +static void ls1x_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, > + int len) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + int real_len = min_t(size_t, len, nandc->buf_len - nandc->buf_off); > + > + memcpy(nandc->dma_buf + nandc->buf_off, buf, real_len); > + nandc->buf_off += real_len; > +} > + > +static inline void set_addr_len(struct mtd_info *mtd, unsigned int command, > + int column, int page_addr) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + int page_shift, addr_low, addr_high; > + > + if (command == NAND_CMD_ERASE1) > + page_shift = chip->page_shift; > + else > + page_shift = chip->page_shift + 1; > + > + addr_low = page_addr << page_shift; > + > + if (column != -1) { > + if (command == NAND_CMD_READOOB) > + column += mtd->writesize; > + addr_low += column; > + nandc->buf_off = 0; > + } > + > + addr_high = > + page_addr >> (sizeof(page_addr) * BITS_PER_BYTE - page_shift); > + > + if (command == NAND_CMD_ERASE1) > + nandc->buf_len = 1; > + else > + nandc->buf_len = mtd->writesize + mtd->oobsize - column; > + > + nand_writel(nandc, NAND_ADDRL, addr_low); > + nand_writel(nandc, NAND_ADDRH, addr_high); > + nand_writel(nandc, NAND_OP_NUM, nandc->buf_len); > +} > + > +static void ls1x_nand_cmdfunc(struct mtd_info *mtd, unsigned int command, > + int column, int page_addr) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + dev_dbg(mtd->dev.parent, "cmd = 0x%02x, col = 0x%08x, page = 0x%08x\n", > + command, column, page_addr); > + > + if (command == NAND_CMD_RNDOUT) { > + nandc->buf_off = column; > + return; > + } > + > + /*set address, buffer length and buffer offset */ > + if (column != -1 || page_addr != -1) > + set_addr_len(mtd, command, column, page_addr); > + > + /*prepare NAND command */ > + switch (command) { > + case NAND_CMD_RESET: > + nandc->cmd_ctrl = CMD_RESET; > + break; > + case NAND_CMD_STATUS: > + nandc->cmd_ctrl = CMD_STATUS; > + break; > + case NAND_CMD_READID: > + nandc->cmd_ctrl = CMD_READID; > + break; > + case NAND_CMD_READ0: > + nandc->cmd_ctrl = OP_SPARE | OP_MAIN | CMD_READ; > + break; > + case NAND_CMD_READOOB: > + nandc->cmd_ctrl = OP_SPARE | CMD_READ; > + break; > + case NAND_CMD_ERASE1: > + nandc->cmd_ctrl = CMD_ERASE; > + break; > + case NAND_CMD_PAGEPROG: > + break; > + case NAND_CMD_SEQIN: > + if (column < mtd->writesize) > + nandc->cmd_ctrl = OP_SPARE | OP_MAIN | CMD_WRITE; > + else > + nandc->cmd_ctrl = OP_SPARE | CMD_WRITE; > + default: > + return; > + } > + > + /*set NAND command */ > + set_cmd(nandc, nandc->cmd_ctrl); > + /*trigger NAND operation */ > + start_nand(nandc); > + /*trigger DMA for R/W operation */ > + if (command == NAND_CMD_READ0 || command == NAND_CMD_READOOB) > + start_dma(mtd, nandc->buf_len, false); > + else if (command == NAND_CMD_PAGEPROG) > + start_dma(mtd, nandc->buf_len, true); > + nand_wait_ready(mtd); > + > + if (command == NAND_CMD_STATUS) { > + nandc->datareg[0] = (char)(nand_readl(nandc, NAND_STATUS) >> 8); > + /*work around hardware bug for invalid STATUS */ > + nandc->datareg[0] |= 0xc0; > + nandc->data_ptr = nandc->datareg; > + } else if (command == NAND_CMD_READID) { > + nandc->datareg[0] = (char)(nand_readl(nandc, NAND_IDH)); > + nandc->datareg[1] = (char)(nand_readl(nandc, NAND_IDL) >> 24); > + nandc->datareg[2] = (char)(nand_readl(nandc, NAND_IDL) >> 16); > + nandc->datareg[3] = (char)(nand_readl(nandc, NAND_IDL) >> 8); > + nandc->datareg[4] = (char)(nand_readl(nandc, NAND_IDL)); > + nandc->data_ptr = nandc->datareg; > + } > + > + nandc->cmd_ctrl = 0; > +} > + > +static void ls1x_nand_hw_init(struct mtd_info *mtd, int hold_cycle, > + int wait_cycle) > +{ > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + int chipsize = (int)(chip->chipsize >> 20); > + int cell_size = 0x0; > + > + switch (chipsize) { > + case SZ_128: /*128M */ > + cell_size = 0x0; > + break; > + case SZ_256: /*256M */ > + cell_size = 0x1; > + break; > + case SZ_512: /*512M */ > + cell_size = 0x2; > + break; > + case SZ_1K: /*1G */ > + cell_size = 0x3; > + break; > + case SZ_2K: /*2G */ > + cell_size = 0x4; > + break; > + case SZ_4K: /*4G */ > + cell_size = 0x5; > + break; > + case SZ_8K: /*8G */ > + cell_size = 0x6; > + break; > + case SZ_16K: /*16G */ > + cell_size = 0x7; > + break; > + default: > + dev_warn(mtd->dev.parent, "unsupported chip size: %d MB\n", > + chipsize); > + } > + > + nand_writel(nandc, NAND_TIMING, (hold_cycle << 8) | wait_cycle); > + nand_writel(nandc, NAND_PARAM, > + (nand_readl(nandc, NAND_PARAM) & 0xfffff0ff) | (cell_size << > + 8)); > +} > + > +static int ls1x_nand_init(struct platform_device *pdev, > + struct ls1x_nand_controller *nandc) > +{ > + struct device *dev = &pdev->dev; > + struct ls1x_nand_chip *nand; > + struct plat_ls1x_nand *pdata; > + struct nand_chip *chip; > + struct mtd_info *mtd; > + int ret = 0; > + > + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL); > + if (!nand) > + return -ENOMEM; > + > + pdata = dev_get_platdata(dev); > + if (!pdata) { > + dev_err(dev, "platform data missing\n"); > + return -EINVAL; > + } > + nand->pdata = pdata; > + > + chip = &nand->chip; > + chip->read_byte = ls1x_nand_read_byte; > + chip->read_buf = ls1x_nand_read_buf; > + chip->write_buf = ls1x_nand_write_buf; > + chip->select_chip = ls1x_nand_select_chip; > + chip->dev_ready = ls1x_nand_dev_ready; > + chip->cmdfunc = ls1x_nand_cmdfunc; > + chip->options = NAND_NO_SUBPAGE_WRITE; > + chip->ecc.mode = NAND_ECC_SOFT; > + nand_set_controller_data(chip, nandc); > + > + mtd = nand_to_mtd(chip); > + mtd->name = "ls1x-nand"; > + mtd->owner = THIS_MODULE; > + mtd->dev.parent = dev; > + > + ret = nand_scan_ident(mtd, 1, NULL); > + if (ret) > + return ret; > + > + ls1x_nand_hw_init(mtd, pdata->hold_cycle, pdata->wait_cycle); > + > + ret = setup_dma(mtd); > + if (ret) > + return ret; > + > + ret = nand_scan_tail(mtd); > + if (ret) { > + dma_release_channel(nandc->dma_chan); > + return ret; > + } > + > + ret = mtd_device_register(mtd, pdata->parts, pdata->nr_parts); > + if (ret) { > + dev_err(dev, "failed to register MTD device: %d\n", ret); > + dma_release_channel(nandc->dma_chan); > + } > + > + platform_set_drvdata(pdev, mtd); > + return ret; > +} > + > +static int ls1x_nand_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct ls1x_nand_controller *nandc; > + struct resource *res; > + int ret; > + > + nandc = devm_kzalloc(dev, sizeof(*nandc), GFP_KERNEL); > + if (!nandc) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) { > + dev_err(dev, "failed to get I/O memory\n"); > + return -ENXIO; > + } > + > + nandc->reg_base = devm_ioremap_resource(dev, res); > + if (IS_ERR(nandc->reg_base)) > + return PTR_ERR(nandc->reg_base); > + > + res = platform_get_resource(pdev, IORESOURCE_DMA, 0); > + if (!res) { > + dev_err(dev, "failed to get DMA information\n"); > + return -ENXIO; > + } > + nandc->dma_chan_id = res->start; > + > + nandc->clk = devm_clk_get(dev, pdev->name); > + if (IS_ERR(nandc->clk)) { > + dev_err(dev, "failed to get %s clock\n", pdev->name); > + return PTR_ERR(nandc->clk); > + } > + clk_prepare_enable(nandc->clk); > + > + ret = ls1x_nand_init(pdev, nandc); > + if (ret) { > + clk_disable_unprepare(nandc->clk); > + return ret; > + } > + > + dev_info(dev, "Loongson1 NAND driver registered\n"); > + return 0; > +} > + > +static int ls1x_nand_remove(struct platform_device *pdev) > +{ > + struct mtd_info *mtd = platform_get_drvdata(pdev); > + struct nand_chip *chip = mtd_to_nand(mtd); > + struct ls1x_nand_controller *nandc = nand_get_controller_data(chip); > + > + if (nandc->dma_chan) > + dma_release_channel(nandc->dma_chan); > + nand_release(mtd); > + clk_disable_unprepare(nandc->clk); > + > + return 0; > +} > + > +static struct platform_driver ls1x_nand_driver = { > + .probe = ls1x_nand_probe, > + .remove = ls1x_nand_remove, > + .driver = { > + .name = "ls1x-nand", > + .owner = THIS_MODULE, > + }, > +}; > + > +module_platform_driver(ls1x_nand_driver); > + > +MODULE_AUTHOR("Kelvin Cheung <keguang.zh...@gmail.com>"); > +MODULE_DESCRIPTION("Loongson1 NAND Flash driver"); > +MODULE_LICENSE("GPL"); -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
