--- /dev/null
+/*
+ * 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_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++ < 5)
+ 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, bool oob)
+{
+ u32 cmd_reg;
+
+ nfc_dbg(nfc, "read, column=%d page=%d len=%d oob:%d\n",
+ column, page_addr, len, oob);
+
+ 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,
+ false);
+ else
+ ar934x_nfc_send_read(nfc, command, column, page_addr,
+ mtd->writesize, false);
+ 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,
+ true);
+ } else {
+ ar934x_nfc_send_read(nfc, NAND_CMD_READ0,
+ column, page_addr,
+ mtd->writesize + mtd->oobsize,
+ true);
+ nfc->buf_index = mtd->writesize;
+ }
+ break;
+
+ case NAND_CMD_RNDOUT:
+ /* emulate subpage read */
+ ar934x_nfc_send_read(nfc, nfc->rndout_read_cmd, column,
+ nfc->rndout_page_addr,
+ mtd->writesize, false);
+ 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);
projects / openwrt / staging / blocktrron.git / commitdiff