diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c | 1151 |
1 files changed, 1151 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c b/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c new file mode 100644 index 000000000..9bc9b125f --- /dev/null +++ b/target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c @@ -0,0 +1,1151 @@ +/* + * Driver for the built-in NAND controller of the Atheros AR934x SoCs + * + * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org> + * + * 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/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/slab.h> + +#include <linux/platform/ar934x_nfc.h> + +#define AR934X_NFC_REG_CMD 0x00 +#define AR934X_NFC_REG_CTRL 0x04 +#define AR934X_NFC_REG_STATUS 0x08 +#define AR934X_NFC_REG_INT_MASK 0x0c +#define AR934X_NFC_REG_INT_STATUS 0x10 +#define AR934X_NFC_REG_ECC_CTRL 0x14 +#define AR934X_NFC_REG_ECC_OFFSET 0x18 +#define AR934X_NFC_REG_ADDR0_0 0x1c +#define AR934X_NFC_REG_ADDR0_1 0x24 +#define AR934X_NFC_REG_ADDR1_0 0x20 +#define AR934X_NFC_REG_ADDR1_1 0x28 +#define AR934X_NFC_REG_SPARE_SIZE 0x30 +#define AR934X_NFC_REG_PROTECT 0x38 +#define AR934X_NFC_REG_LOOKUP_EN 0x40 +#define AR934X_NFC_REG_LOOKUP(_x) (0x44 + (_i) * 4) +#define AR934X_NFC_REG_DMA_ADDR 0x64 +#define AR934X_NFC_REG_DMA_COUNT 0x68 +#define AR934X_NFC_REG_DMA_CTRL 0x6c +#define AR934X_NFC_REG_MEM_CTRL 0x80 +#define AR934X_NFC_REG_DATA_SIZE 0x84 +#define AR934X_NFC_REG_READ_STATUS 0x88 +#define AR934X_NFC_REG_TIME_SEQ 0x8c +#define AR934X_NFC_REG_TIMINGS_ASYN 0x90 +#define AR934X_NFC_REG_TIMINGS_SYN 0x94 +#define AR934X_NFC_REG_FIFO_DATA 0x98 +#define AR934X_NFC_REG_TIME_MODE 0x9c +#define AR934X_NFC_REG_DMA_ADDR_OFFS 0xa0 +#define AR934X_NFC_REG_FIFO_INIT 0xb0 +#define AR934X_NFC_REG_GEN_SEQ_CTRL 0xb4 + +#define AR934X_NFC_CMD_CMD_SEQ_S 0 +#define AR934X_NFC_CMD_CMD_SEQ_M 0x3f +#define AR934X_NFC_CMD_SEQ_1C 0x00 +#define AR934X_NFC_CMD_SEQ_ERASE 0x0e +#define AR934X_NFC_CMD_SEQ_12 0x0c +#define AR934X_NFC_CMD_SEQ_1C1AXR 0x21 +#define AR934X_NFC_CMD_SEQ_S 0x24 +#define AR934X_NFC_CMD_SEQ_1C3AXR 0x27 +#define AR934X_NFC_CMD_SEQ_1C5A1CXR 0x2a +#define AR934X_NFC_CMD_SEQ_18 0x32 +#define AR934X_NFC_CMD_INPUT_SEL_SIU 0 +#define AR934X_NFC_CMD_INPUT_SEL_DMA BIT(6) +#define AR934X_NFC_CMD_ADDR_SEL_0 0 +#define AR934X_NFC_CMD_ADDR_SEL_1 BIT(7) +#define AR934X_NFC_CMD_CMD0_S 8 +#define AR934X_NFC_CMD_CMD0_M 0xff +#define AR934X_NFC_CMD_CMD1_S 16 +#define AR934X_NFC_CMD_CMD1_M 0xff +#define AR934X_NFC_CMD_CMD2_S 24 +#define AR934X_NFC_CMD_CMD2_M 0xff + +#define AR934X_NFC_CTRL_ADDR_CYCLE0_M 0x7 +#define AR934X_NFC_CTRL_ADDR_CYCLE0_S 0 +#define AR934X_NFC_CTRL_SPARE_EN BIT(3) +#define AR934X_NFC_CTRL_INT_EN BIT(4) +#define AR934X_NFC_CTRL_ECC_EN BIT(5) +#define AR934X_NFC_CTRL_BLOCK_SIZE_S 6 +#define AR934X_NFC_CTRL_BLOCK_SIZE_M 0x3 +#define AR934X_NFC_CTRL_BLOCK_SIZE_32 0 +#define AR934X_NFC_CTRL_BLOCK_SIZE_64 1 +#define AR934X_NFC_CTRL_BLOCK_SIZE_128 2 +#define AR934X_NFC_CTRL_BLOCK_SIZE_256 3 +#define AR934X_NFC_CTRL_PAGE_SIZE_S 8 +#define AR934X_NFC_CTRL_PAGE_SIZE_M 0x7 +#define AR934X_NFC_CTRL_PAGE_SIZE_256 0 +#define AR934X_NFC_CTRL_PAGE_SIZE_512 1 +#define AR934X_NFC_CTRL_PAGE_SIZE_1024 2 +#define AR934X_NFC_CTRL_PAGE_SIZE_2048 3 +#define AR934X_NFC_CTRL_PAGE_SIZE_4096 4 +#define AR934X_NFC_CTRL_PAGE_SIZE_8192 5 +#define AR934X_NFC_CTRL_PAGE_SIZE_16384 6 +#define AR934X_NFC_CTRL_CUSTOM_SIZE_EN BIT(11) +#define AR934X_NFC_CTRL_IO_WIDTH_8BITS 0 +#define AR934X_NFC_CTRL_IO_WIDTH_16BITS BIT(12) +#define AR934X_NFC_CTRL_LOOKUP_EN BIT(13) +#define AR934X_NFC_CTRL_PROT_EN BIT(14) +#define AR934X_NFC_CTRL_WORK_MODE_ASYNC 0 +#define AR934X_NFC_CTRL_WORK_MODE_SYNC BIT(15) +#define AR934X_NFC_CTRL_ADDR0_AUTO_INC BIT(16) +#define AR934X_NFC_CTRL_ADDR1_AUTO_INC BIT(17) +#define AR934X_NFC_CTRL_ADDR_CYCLE1_M 0x7 +#define AR934X_NFC_CTRL_ADDR_CYCLE1_S 18 +#define AR934X_NFC_CTRL_SMALL_PAGE BIT(21) + +#define AR934X_NFC_DMA_CTRL_DMA_START BIT(7) +#define AR934X_NFC_DMA_CTRL_DMA_DIR_WRITE 0 +#define AR934X_NFC_DMA_CTRL_DMA_DIR_READ BIT(6) +#define AR934X_NFC_DMA_CTRL_DMA_MODE_SG BIT(5) +#define AR934X_NFC_DMA_CTRL_DMA_BURST_S 2 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_0 0 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_1 1 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_2 2 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_3 3 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_4 4 +#define AR934X_NFC_DMA_CTRL_DMA_BURST_5 5 +#define AR934X_NFC_DMA_CTRL_ERR_FLAG BIT(1) +#define AR934X_NFC_DMA_CTRL_DMA_READY BIT(0) + +#define AR934X_NFC_INT_DEV_RDY(_x) BIT(4 + (_x)) +#define AR934X_NFC_INT_CMD_END BIT(1) + +/* default timing values */ +#define AR934X_NFC_TIME_SEQ_DEFAULT 0x7fff +#define AR934X_NFC_TIMINGS_ASYN_DEFAULT 0x22 +#define AR934X_NFC_TIMINGS_SYN_DEFAULT 0xf + +#define AR934X_NFC_ID_BUF_SIZE 8 +#define AR934X_NFC_DEV_READY_TIMEOUT 25 /* msecs */ +#define AR934X_NFC_DMA_READY_TIMEOUT 25 /* msecs */ +#define AR934X_NFC_DONE_TIMEOUT 1000 +#define AR934X_NFC_DMA_RETRIES 20 + +#define AR934X_NFC_USE_IRQ true +#define AR934X_NFC_IRQ_MASK AR934X_NFC_INT_DEV_RDY(0) + +#define AR934X_NFC_GENSEQ_SMALL_PAGE_READ 0x30043 + +#undef AR934X_NFC_DEBUG_DATA +#undef AR934X_NFC_DEBUG + +struct ar934x_nfc; + +static inline __attribute__ ((format (printf, 2, 3))) +void _nfc_dbg(struct ar934x_nfc *nfc, const char *fmt, ...) +{ +} + +#ifdef AR934X_NFC_DEBUG +#define nfc_dbg(_nfc, fmt, ...) \ + dev_info((_nfc)->parent, fmt, ##__VA_ARGS__) +#else +#define nfc_dbg(_nfc, fmt, ...) \ + _nfc_dbg((_nfc), fmt, ##__VA_ARGS__) +#endif /* AR934X_NFC_DEBUG */ + +#ifdef AR934X_NFC_DEBUG_DATA +static void +nfc_debug_data(const char *label, void *data, int len) +{ + print_hex_dump(KERN_WARNING, label, DUMP_PREFIX_OFFSET, 16, 1, + data, len, 0); +} +#else +static inline void +nfc_debug_data(const char *label, void *data, int len) {} +#endif /* AR934X_NFC_DEBUG_DATA */ + +struct ar934x_nfc { + struct mtd_info mtd; + struct nand_chip nand_chip; + struct device *parent; + void __iomem *base; + void (*select_chip)(int chip_no); + int irq; + wait_queue_head_t irq_waitq; + + bool spurious_irq_expected; + u32 irq_status; + + u32 ctrl_reg; + bool small_page; + unsigned int addr_count0; + unsigned int addr_count1; + + u8 *buf; + dma_addr_t buf_dma; + unsigned int buf_size; + int buf_index; + + int erase1_page_addr; + + int rndout_page_addr; + int rndout_read_cmd; + + int seqin_page_addr; + int seqin_column; + int seqin_read_cmd; +}; + +static void ar934x_nfc_restart(struct ar934x_nfc *nfc); + +static inline void +ar934x_nfc_wr(struct ar934x_nfc *nfc, unsigned reg, u32 val) +{ + __raw_writel(val, nfc->base + reg); +} + +static inline u32 +ar934x_nfc_rr(struct ar934x_nfc *nfc, unsigned reg) +{ + return __raw_readl(nfc->base + reg); +} + +static inline struct ar934x_nfc_platform_data * +ar934x_nfc_get_platform_data(struct ar934x_nfc *nfc) +{ + return nfc->parent->platform_data; +} + +static inline struct +ar934x_nfc *mtd_to_ar934x_nfc(struct mtd_info *mtd) +{ + return container_of(mtd, struct ar934x_nfc, mtd); +} + +static inline bool ar934x_nfc_use_irq(struct ar934x_nfc *nfc) +{ + return AR934X_NFC_USE_IRQ; +} + +static inline void ar934x_nfc_write_cmd_reg(struct ar934x_nfc *nfc, u32 cmd_reg) +{ + wmb(); + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CMD, cmd_reg); + /* flush write */ + ar934x_nfc_rr(nfc, AR934X_NFC_REG_CMD); +} + +static bool +__ar934x_nfc_dev_ready(struct ar934x_nfc *nfc) +{ + u32 status; + + status = ar934x_nfc_rr(nfc, AR934X_NFC_REG_STATUS); + return (status & 0xff) == 0xff; +} + +static inline bool +__ar934x_nfc_is_dma_ready(struct ar934x_nfc *nfc) +{ + u32 status; + + status = ar934x_nfc_rr(nfc, AR934X_NFC_REG_DMA_CTRL); + return (status & AR934X_NFC_DMA_CTRL_DMA_READY) != 0; +} + +static int +ar934x_nfc_wait_dev_ready(struct ar934x_nfc *nfc) +{ + unsigned long timeout; + + timeout = jiffies + msecs_to_jiffies(AR934X_NFC_DEV_READY_TIMEOUT); + do { + if (__ar934x_nfc_dev_ready(nfc)) + return 0; + } while time_before(jiffies, timeout); + + nfc_dbg(nfc, "timeout waiting for device ready, status:%08x int:%08x\n", + ar934x_nfc_rr(nfc, AR934X_NFC_REG_STATUS), + ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_STATUS)); + return -ETIMEDOUT; +} + +static int +ar934x_nfc_wait_dma_ready(struct ar934x_nfc *nfc) +{ + unsigned long timeout; + + timeout = jiffies + msecs_to_jiffies(AR934X_NFC_DMA_READY_TIMEOUT); + do { + if (__ar934x_nfc_is_dma_ready(nfc)) + return 0; + } while time_before(jiffies, timeout); + + nfc_dbg(nfc, "timeout waiting for DMA ready, dma_ctrl:%08x\n", + ar934x_nfc_rr(nfc, AR934X_NFC_REG_DMA_CTRL)); + return -ETIMEDOUT; +} + +static int +ar934x_nfc_wait_irq(struct ar934x_nfc *nfc) +{ + long timeout; + int ret; + + timeout = wait_event_timeout(nfc->irq_waitq, + (nfc->irq_status & AR934X_NFC_IRQ_MASK) != 0, + msecs_to_jiffies(AR934X_NFC_DEV_READY_TIMEOUT)); + + ret = 0; + if (!timeout) { + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_MASK, 0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + /* flush write */ + ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_STATUS); + + nfc_dbg(nfc, + "timeout waiting for interrupt, status:%08x\n", + nfc->irq_status); + ret = -ETIMEDOUT; + } + + nfc->irq_status = 0; + return ret; +} + +static int +ar934x_nfc_wait_done(struct ar934x_nfc *nfc) +{ + int ret; + + if (ar934x_nfc_use_irq(nfc)) + ret = ar934x_nfc_wait_irq(nfc); + else + ret = ar934x_nfc_wait_dev_ready(nfc); + + if (ret) + return ret; + + return ar934x_nfc_wait_dma_ready(nfc); +} + +static int +ar934x_nfc_alloc_buf(struct ar934x_nfc *nfc, unsigned size) +{ + nfc->buf = dma_alloc_coherent(nfc->parent, size, + &nfc->buf_dma, GFP_KERNEL); + if (nfc->buf == NULL) { + dev_err(nfc->parent, "no memory for DMA buffer\n"); + return -ENOMEM; + } + + nfc->buf_size = size; + nfc_dbg(nfc, "buf:%p size:%u\n", nfc->buf, nfc->buf_size); + + return 0; +} + +static void +ar934x_nfc_free_buf(struct ar934x_nfc *nfc) +{ + dma_free_coherent(nfc->parent, nfc->buf_size, nfc->buf, nfc->buf_dma); +} + +static void +ar934x_nfc_get_addr(struct ar934x_nfc *nfc, int column, int page_addr, + u32 *addr0, u32 *addr1) +{ + u32 a0, a1; + + a0 = 0; + a1 = 0; + + if (column == -1) { + /* ERASE1 */ + a0 = (page_addr & 0xffff) << 16; + a1 = (page_addr >> 16) & 0xf; + } else if (page_addr != -1) { + /* SEQIN, READ0, etc.. */ + + /* TODO: handle 16bit bus width */ + if (nfc->small_page) { + a0 = column & 0xff; + a0 |= (page_addr & 0xff) << 8; + a0 |= ((page_addr >> 8) & 0xff) << 16; + a0 |= ((page_addr >> 16) & 0xff) << 24; + } else { + a0 = column & 0x0FFF; + a0 |= (page_addr & 0xffff) << 16; + + if (nfc->addr_count0 > 4) + a1 = (page_addr >> 16) & 0xf; + } + } + + *addr0 = a0; + *addr1 = a1; +} + +static void +ar934x_nfc_send_cmd(struct ar934x_nfc *nfc, unsigned command) +{ + u32 cmd_reg; + + cmd_reg = AR934X_NFC_CMD_INPUT_SEL_SIU | AR934X_NFC_CMD_ADDR_SEL_0 | + AR934X_NFC_CMD_SEQ_1C; + cmd_reg |= (command & AR934X_NFC_CMD_CMD0_M) << AR934X_NFC_CMD_CMD0_S; + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, nfc->ctrl_reg); + + ar934x_nfc_write_cmd_reg(nfc, cmd_reg); + ar934x_nfc_wait_dev_ready(nfc); +} + +static void +ar934x_nfc_do_rw_command(struct ar934x_nfc *nfc, int column, int page_addr, + int len, u32 cmd_reg, u32 ctrl_reg, bool write) +{ + u32 addr0, addr1; + u32 dma_ctrl; + int dir; + int err; + int retries = 0; + + WARN_ON(len & 3); + + if (WARN_ON(len > nfc->buf_size)) + dev_err(nfc->parent, "len=%d > buf_size=%d", len, nfc->buf_size); + + if (write) { + dma_ctrl = AR934X_NFC_DMA_CTRL_DMA_DIR_WRITE; + dir = DMA_TO_DEVICE; + } else { + dma_ctrl = AR934X_NFC_DMA_CTRL_DMA_DIR_READ; + dir = DMA_FROM_DEVICE; + } + + ar934x_nfc_get_addr(nfc, column, page_addr, &addr0, &addr1); + + dma_ctrl |= AR934X_NFC_DMA_CTRL_DMA_START | + (AR934X_NFC_DMA_CTRL_DMA_BURST_3 << + AR934X_NFC_DMA_CTRL_DMA_BURST_S); + + cmd_reg |= AR934X_NFC_CMD_INPUT_SEL_DMA | AR934X_NFC_CMD_ADDR_SEL_0; + ctrl_reg |= AR934X_NFC_CTRL_INT_EN; + + nfc_dbg(nfc, "%s a0:%08x a1:%08x len:%x cmd:%08x dma:%08x ctrl:%08x\n", + (write) ? "write" : "read", + addr0, addr1, len, cmd_reg, dma_ctrl, ctrl_reg); + +retry: + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_ADDR0_0, addr0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_ADDR0_1, addr1); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_DMA_ADDR, nfc->buf_dma); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_DMA_COUNT, len); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_DATA_SIZE, len); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, ctrl_reg); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_DMA_CTRL, dma_ctrl); + + if (ar934x_nfc_use_irq(nfc)) { + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_MASK, AR934X_NFC_IRQ_MASK); + /* flush write */ + ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_MASK); + } + + ar934x_nfc_write_cmd_reg(nfc, cmd_reg); + err = ar934x_nfc_wait_done(nfc); + if (err) { + dev_dbg(nfc->parent, "%s operation stuck at page %d\n", + (write) ? "write" : "read", page_addr); + + ar934x_nfc_restart(nfc); + if (retries++ < AR934X_NFC_DMA_RETRIES) + goto retry; + + dev_err(nfc->parent, "%s operation failed on page %d\n", + (write) ? "write" : "read", page_addr); + } +} + +static void +ar934x_nfc_send_readid(struct ar934x_nfc *nfc, unsigned command) +{ + u32 cmd_reg; + + nfc_dbg(nfc, "readid, cmd:%02x\n", command); + + cmd_reg = AR934X_NFC_CMD_SEQ_1C1AXR; + cmd_reg |= (command & AR934X_NFC_CMD_CMD0_M) << AR934X_NFC_CMD_CMD0_S; + + ar934x_nfc_do_rw_command(nfc, -1, -1, AR934X_NFC_ID_BUF_SIZE, cmd_reg, + nfc->ctrl_reg, false); + + nfc_debug_data("[id] ", nfc->buf, AR934X_NFC_ID_BUF_SIZE); +} + +static void +ar934x_nfc_send_read(struct ar934x_nfc *nfc, unsigned command, int column, + int page_addr, int len) +{ + u32 cmd_reg; + + nfc_dbg(nfc, "read, column=%d page=%d len=%d\n", + column, page_addr, len); + + cmd_reg = (command & AR934X_NFC_CMD_CMD0_M) << AR934X_NFC_CMD_CMD0_S; + + if (nfc->small_page) { + cmd_reg |= AR934X_NFC_CMD_SEQ_18; + } else { + cmd_reg |= NAND_CMD_READSTART << AR934X_NFC_CMD_CMD1_S; + cmd_reg |= AR934X_NFC_CMD_SEQ_1C5A1CXR; + } + + ar934x_nfc_do_rw_command(nfc, column, page_addr, len, + cmd_reg, nfc->ctrl_reg, false); + + nfc_debug_data("[data] ", nfc->buf, len); +} + +static void +ar934x_nfc_send_erase(struct ar934x_nfc *nfc, unsigned command, int column, + int page_addr) +{ + u32 addr0, addr1; + u32 ctrl_reg; + u32 cmd_reg; + + ar934x_nfc_get_addr(nfc, column, page_addr, &addr0, &addr1); + + ctrl_reg = nfc->ctrl_reg; + if (nfc->small_page) { + /* override number of address cycles for the erase command */ + ctrl_reg &= ~(AR934X_NFC_CTRL_ADDR_CYCLE0_M << + AR934X_NFC_CTRL_ADDR_CYCLE0_S); + ctrl_reg &= ~(AR934X_NFC_CTRL_ADDR_CYCLE1_M << + AR934X_NFC_CTRL_ADDR_CYCLE1_S); + ctrl_reg &= ~(AR934X_NFC_CTRL_SMALL_PAGE); + ctrl_reg |= (nfc->addr_count0 + 1) << + AR934X_NFC_CTRL_ADDR_CYCLE0_S; + } + + cmd_reg = NAND_CMD_ERASE1 << AR934X_NFC_CMD_CMD0_S; + cmd_reg |= command << AR934X_NFC_CMD_CMD1_S; + cmd_reg |= AR934X_NFC_CMD_SEQ_ERASE; + + nfc_dbg(nfc, "erase page %d, a0:%08x a1:%08x cmd:%08x ctrl:%08x\n", + page_addr, addr0, addr1, cmd_reg, ctrl_reg); + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, ctrl_reg); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_ADDR0_0, addr0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_ADDR0_1, addr1); + + ar934x_nfc_write_cmd_reg(nfc, cmd_reg); + ar934x_nfc_wait_dev_ready(nfc); +} + +static void +ar934x_nfc_send_write(struct ar934x_nfc *nfc, unsigned command, int column, + int page_addr, int len) +{ + u32 cmd_reg; + + nfc_dbg(nfc, "write, column=%d page=%d len=%d\n", + column, page_addr, len); + + nfc_debug_data("[data] ", nfc->buf, len); + + cmd_reg = NAND_CMD_SEQIN << AR934X_NFC_CMD_CMD0_S; + cmd_reg |= command << AR934X_NFC_CMD_CMD1_S; + cmd_reg |= AR934X_NFC_CMD_SEQ_12; + + ar934x_nfc_do_rw_command(nfc, column, page_addr, len, + cmd_reg, nfc->ctrl_reg, true); +} + +static void +ar934x_nfc_read_status(struct ar934x_nfc *nfc) +{ + u32 cmd_reg; + u32 status; + + cmd_reg = NAND_CMD_STATUS << AR934X_NFC_CMD_CMD0_S; + cmd_reg |= AR934X_NFC_CMD_SEQ_S; + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, nfc->ctrl_reg); + + ar934x_nfc_write_cmd_reg(nfc, cmd_reg); + ar934x_nfc_wait_dev_ready(nfc); + + status = ar934x_nfc_rr(nfc, AR934X_NFC_REG_READ_STATUS); + + nfc_dbg(nfc, "read status, cmd:%08x status:%02x\n", + cmd_reg, (status & 0xff)); + + nfc->buf[0 ^ 3] = status; +} + +static void +ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command, int column, + int page_addr) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + + if (command != NAND_CMD_PAGEPROG) + nfc->buf_index = 0; + + switch (command) { + case NAND_CMD_RESET: + ar934x_nfc_send_cmd(nfc, command); + break; + + case NAND_CMD_READID: + ar934x_nfc_send_readid(nfc, command); + break; + + case NAND_CMD_READ0: + case NAND_CMD_READ1: + if (nfc->small_page) { + ar934x_nfc_send_read(nfc, command, column, page_addr, + mtd->writesize + mtd->oobsize); + } else { + ar934x_nfc_send_read(nfc, command, 0, page_addr, + mtd->writesize + mtd->oobsize); + nfc->buf_index = column; + nfc->rndout_page_addr = page_addr; + nfc->rndout_read_cmd = command; + } + break; + + case NAND_CMD_READOOB: + if (nfc->small_page) + ar934x_nfc_send_read(nfc, NAND_CMD_READOOB, + column, page_addr, + mtd->oobsize); + else + ar934x_nfc_send_read(nfc, NAND_CMD_READ0, + mtd->writesize, page_addr, + mtd->oobsize); + break; + + case NAND_CMD_RNDOUT: + if (WARN_ON(nfc->small_page)) + break; + + /* emulate subpage read */ + ar934x_nfc_send_read(nfc, nfc->rndout_read_cmd, 0, + nfc->rndout_page_addr, + mtd->writesize + mtd->oobsize); + nfc->buf_index = column; + break; + + case NAND_CMD_ERASE1: + nfc->erase1_page_addr = page_addr; + break; + + case NAND_CMD_ERASE2: + ar934x_nfc_send_erase(nfc, command, -1, nfc->erase1_page_addr); + break; + + case NAND_CMD_STATUS: + ar934x_nfc_read_status(nfc); + break; + + case NAND_CMD_SEQIN: + if (nfc->small_page) { + /* output read command */ + if (column >= mtd->writesize) { + column -= mtd->writesize; + nfc->seqin_read_cmd = NAND_CMD_READOOB; + } else if (column < 256) { + nfc->seqin_read_cmd = NAND_CMD_READ0; + } else { + column -= 256; + nfc->seqin_read_cmd = NAND_CMD_READ1; + } + } else { + nfc->seqin_read_cmd = NAND_CMD_READ0; + } + nfc->seqin_column = column; + nfc->seqin_page_addr = page_addr; + break; + + case NAND_CMD_PAGEPROG: + if (nfc->small_page) + ar934x_nfc_send_cmd(nfc, nfc->seqin_read_cmd); + + ar934x_nfc_send_write(nfc, command, nfc->seqin_column, + nfc->seqin_page_addr, + nfc->buf_index); + break; + + default: + dev_err(nfc->parent, + "unsupported command: %x, column:%d page_addr=%d\n", + command, column, page_addr); + break; + } +} + +static int +ar934x_nfc_dev_ready(struct mtd_info *mtd) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + + return __ar934x_nfc_dev_ready(nfc); +} + +static void +ar934x_nfc_select_chip(struct mtd_info *mtd, int chip_no) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + + if (nfc->select_chip) + nfc->select_chip(chip_no); +} + +static u8 +ar934x_nfc_read_byte(struct mtd_info *mtd) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + unsigned int buf_index; + u8 data; + + WARN_ON(nfc->buf_index >= nfc->buf_size); + + buf_index = nfc->buf_index ^ 3; + data = nfc->buf[buf_index]; + nfc->buf_index++; + + return data; +} + +static void +ar934x_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int len) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + int i; + + WARN_ON(nfc->buf_index + len > nfc->buf_size); + + for (i = 0; i < len; i++) { + nfc->buf[nfc->buf_index ^ 3] = buf[i]; + nfc->buf_index++; + } +} + +static void +ar934x_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int len) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + int buf_index; + int i; + + WARN_ON(nfc->buf_index + len > nfc->buf_size); + + buf_index = nfc->buf_index; + + for (i = 0; i < len; i++) { + buf[i] = nfc->buf[buf_index ^ 3]; + buf_index++; + } + + nfc->buf_index = buf_index; +} + +static int +ar934x_nfc_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + int i; + + for (i = 0; i < len; i++) + if (buf[i] != ar934x_nfc_read_byte(mtd)) + return -EFAULT; + + return 0; +} + +static void +ar934x_nfc_hw_init(struct ar934x_nfc *nfc) +{ + struct ar934x_nfc_platform_data *pdata; + + pdata = ar934x_nfc_get_platform_data(nfc); + if (pdata->hw_reset) { + pdata->hw_reset(true); + pdata->hw_reset(false); + } + + /* + * setup timings + * TODO: make it configurable via platform data + */ + ar934x_nfc_wr(nfc, AR934X_NFC_REG_TIME_SEQ, + AR934X_NFC_TIME_SEQ_DEFAULT); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_TIMINGS_ASYN, + AR934X_NFC_TIMINGS_ASYN_DEFAULT); + ar934x_nfc_wr(nfc, AR934X_NFC_REG_TIMINGS_SYN, + AR934X_NFC_TIMINGS_SYN_DEFAULT); + + /* disable WP on all chips, and select chip 0 */ + ar934x_nfc_wr(nfc, AR934X_NFC_REG_MEM_CTRL, 0xff00); + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_DMA_ADDR_OFFS, 0); + + /* initialize Control register */ + nfc->ctrl_reg = AR934X_NFC_CTRL_CUSTOM_SIZE_EN; + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, nfc->ctrl_reg); + + if (nfc->small_page) { + /* Setup generic sequence register for small page reads. */ + ar934x_nfc_wr(nfc, AR934X_NFC_REG_GEN_SEQ_CTRL, + AR934X_NFC_GENSEQ_SMALL_PAGE_READ); + } +} + +static void +ar934x_nfc_restart(struct ar934x_nfc *nfc) +{ + u32 ctrl_reg; + + if (nfc->select_chip) + nfc->select_chip(-1); + + ctrl_reg = nfc->ctrl_reg; + ar934x_nfc_hw_init(nfc); + nfc->ctrl_reg = ctrl_reg; + + if (nfc->select_chip) + nfc->select_chip(0); + + ar934x_nfc_send_cmd(nfc, NAND_CMD_RESET); +} + +static irqreturn_t +ar934x_nfc_irq_handler(int irq, void *data) +{ + struct ar934x_nfc *nfc = data; + u32 status; + + status = ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_STATUS); + + ar934x_nfc_wr(nfc, AR934X_NFC_REG_INT_STATUS, 0); + /* flush write */ + ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_STATUS); + + status &= ar934x_nfc_rr(nfc, AR934X_NFC_REG_INT_MASK); + if (status) { + nfc_dbg(nfc, "got IRQ, status:%08x\n", status); + + nfc->irq_status = status; + nfc->spurious_irq_expected = true; + wake_up(&nfc->irq_waitq); + } else { + if (nfc->spurious_irq_expected) { + nfc->spurious_irq_expected = false; + } else { + dev_warn(nfc->parent, "spurious interrupt\n"); + } + } + + return IRQ_HANDLED; +} + +static int __devinit +ar934x_nfc_init_tail(struct mtd_info *mtd) +{ + struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd); + struct nand_chip *chip = &nfc->nand_chip; + u32 ctrl; + u32 t; + int err; + + switch (mtd->oobsize) { + case 16: + case 64: + case 128: + ar934x_nfc_wr(nfc, AR934X_NFC_REG_SPARE_SIZE, mtd->oobsize); + break; + + default: + dev_err(nfc->parent, "unsupported OOB size: %d bytes\n", + mtd->oobsize); + return -ENXIO; + } + + ctrl = AR934X_NFC_CTRL_CUSTOM_SIZE_EN; + + switch (mtd->erasesize / mtd->writesize) { + case 32: + t = AR934X_NFC_CTRL_BLOCK_SIZE_32; + break; + + case 64: + t = AR934X_NFC_CTRL_BLOCK_SIZE_64; + break; + + case 128: + t = AR934X_NFC_CTRL_BLOCK_SIZE_128; + break; + + case 256: + t = AR934X_NFC_CTRL_BLOCK_SIZE_256; + break; + + default: + dev_err(nfc->parent, "unsupported block size: %u\n", + mtd->erasesize / mtd->writesize); + return -ENXIO; + } + + ctrl |= t << AR934X_NFC_CTRL_BLOCK_SIZE_S; + + switch (mtd->writesize) { + case 256: + nfc->small_page = 1; + t = AR934X_NFC_CTRL_PAGE_SIZE_256; + break; + + case 512: + nfc->small_page = 1; + t = AR934X_NFC_CTRL_PAGE_SIZE_512; + break; + + case 1024: + t = AR934X_NFC_CTRL_PAGE_SIZE_1024; + break; + + case 2048: + t = AR934X_NFC_CTRL_PAGE_SIZE_2048; + break; + + case 4096: + t = AR934X_NFC_CTRL_PAGE_SIZE_4096; + break; + + case 8192: + t = AR934X_NFC_CTRL_PAGE_SIZE_8192; + break; + + case 16384: + t = AR934X_NFC_CTRL_PAGE_SIZE_16384; + break; + + default: + dev_err(nfc->parent, "unsupported write size: %d bytes\n", + mtd->writesize); + return -ENXIO; + } + + ctrl |= t << AR934X_NFC_CTRL_PAGE_SIZE_S; + + if (nfc->small_page) { + ctrl |= AR934X_NFC_CTRL_SMALL_PAGE; + + if (chip->chipsize > (32 << 20)) { + nfc->addr_count0 = 4; + nfc->addr_count1 = 3; + } else if (chip->chipsize > (2 << 16)) { + nfc->addr_count0 = 3; + nfc->addr_count1 = 2; + } else { + nfc->addr_count0 = 2; + nfc->addr_count1 = 1; + } + } else { + if (chip->chipsize > (128 << 20)) { + nfc->addr_count0 = 5; + nfc->addr_count1 = 3; + } else if (chip->chipsize > (8 << 16)) { + nfc->addr_count0 = 4; + nfc->addr_count1 = 2; + } else { + nfc->addr_count0 = 3; + nfc->addr_count1 = 1; + } + } + + ctrl |= nfc->addr_count0 << AR934X_NFC_CTRL_ADDR_CYCLE0_S; + ctrl |= nfc->addr_count1 << AR934X_NFC_CTRL_ADDR_CYCLE1_S; + + nfc->ctrl_reg = ctrl; + ar934x_nfc_wr(nfc, AR934X_NFC_REG_CTRL, nfc->ctrl_reg); + + ar934x_nfc_free_buf(nfc); + err = ar934x_nfc_alloc_buf(nfc, mtd->writesize + mtd->oobsize); + + return err; +} + +static int __devinit +ar934x_nfc_probe(struct platform_device *pdev) +{ + static const char *part_probes[] = { "cmdlinepart", NULL, }; + struct ar934x_nfc_platform_data *pdata; + struct ar934x_nfc *nfc; + struct resource *res; + struct mtd_info *mtd; + struct nand_chip *nand; + struct mtd_part_parser_data ppdata; + int ret; + + pdata = pdev->dev.platform_data; + if (pdata == NULL) { + dev_err(&pdev->dev, "no platform data defined\n"); + return -EINVAL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "failed to get I/O memory\n"); + return -EINVAL; + } + + nfc = kzalloc(sizeof(struct ar934x_nfc), GFP_KERNEL); + if (!nfc) { + dev_err(&pdev->dev, "failed to allocate driver data\n"); + return -ENOMEM; + } + + nfc->base = ioremap(res->start, resource_size(res)); + if (nfc->base == NULL) { + dev_err(&pdev->dev, "failed to remap I/O memory\n"); + ret = -ENXIO; + goto err_free_nand; + } + + nfc->irq = platform_get_irq(pdev, 0); + if (nfc->irq < 0) { + dev_err(&pdev->dev, "no IRQ resource specified\n"); + ret = -EINVAL; + goto err_unmap; + } + + init_waitqueue_head(&nfc->irq_waitq); + ret = request_irq(nfc->irq, ar934x_nfc_irq_handler, IRQF_DISABLED, + dev_name(&pdev->dev), nfc); + if (ret) { + dev_err(&pdev->dev, "requast_irq failed, err:%d\n", ret); + goto err_unmap; + } + + nfc->parent = &pdev->dev; + nfc->select_chip = pdata->select_chip; + + nand = &nfc->nand_chip; + mtd = &nfc->mtd; + + mtd->priv = nand; + mtd->owner = THIS_MODULE; + if (pdata->name) + mtd->name = pdata->name; + else + mtd->name = dev_name(&pdev->dev); + + nand->options = NAND_NO_AUTOINCR; + nand->chip_delay = 25; + nand->ecc.mode = NAND_ECC_SOFT; + + nand->dev_ready = ar934x_nfc_dev_ready; + nand->cmdfunc = ar934x_nfc_cmdfunc; + nand->read_byte = ar934x_nfc_read_byte; + nand->write_buf = ar934x_nfc_write_buf; + nand->read_buf = ar934x_nfc_read_buf; + nand->verify_buf = ar934x_nfc_verify_buf; + nand->select_chip = ar934x_nfc_select_chip; + + ret = ar934x_nfc_alloc_buf(nfc, AR934X_NFC_ID_BUF_SIZE); + if (ret) + goto err_free_irq; + + platform_set_drvdata(pdev, nfc); + + ar934x_nfc_hw_init(nfc); + + ret = nand_scan_ident(mtd, 1, NULL); + if (ret) { + dev_err(&pdev->dev, "nand_scan_ident failed, err:%d\n", ret); + goto err_free_buf; + } + + ret = ar934x_nfc_init_tail(mtd); + if (ret) { + dev_err(&pdev->dev, "init tail failed, err:%d\n", ret); + goto err_free_buf; + } + + if (pdata->scan_fixup) { + ret = pdata->scan_fixup(mtd); + if (ret) + goto err_free_buf; + } + + ret = nand_scan_tail(mtd); + if (ret) { + dev_err(&pdev->dev, "scan tail failed, err:%d\n", ret); + goto err_free_buf; + } + + memset(&ppdata, '\0', sizeof(ppdata)); + ret = mtd_device_parse_register(mtd, part_probes, &ppdata, + pdata->parts, pdata->nr_parts); + if (ret) { + dev_err(&pdev->dev, "unable to register mtd, err:%d\n", ret); + goto err_free_buf; + } + + return 0; + +err_free_buf: + ar934x_nfc_free_buf(nfc); +err_free_irq: + free_irq(nfc->irq, nfc); +err_unmap: + iounmap(nfc->base); +err_free_nand: + kfree(nfc); + platform_set_drvdata(pdev, NULL); + return ret; +} + +static int __devexit +ar934x_nfc_remove(struct platform_device *pdev) +{ + struct ar934x_nfc *nfc; + + nfc = platform_get_drvdata(pdev); + if (nfc) { + nand_release(&nfc->mtd); + ar934x_nfc_free_buf(nfc); + free_irq(nfc->irq, nfc); + iounmap(nfc->base); + kfree(nfc); + } + + return 0; +} + +static struct platform_driver ar934x_nfc_driver = { + .probe = ar934x_nfc_probe, + .remove = __devexit_p(ar934x_nfc_remove), + .driver = { + .name = AR934X_NFC_DRIVER_NAME, + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(ar934x_nfc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); +MODULE_DESCRIPTION("Atheros AR934x NAND Flash Controller driver"); +MODULE_ALIAS("platform:" AR934X_NFC_DRIVER_NAME); |