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-rw-r--r--kernel/drivers/mtd/nand/denali.c1621
1 files changed, 1621 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/nand/denali.c b/kernel/drivers/mtd/nand/denali.c
new file mode 100644
index 000000000..870c7fc0f
--- /dev/null
+++ b/kernel/drivers/mtd/nand/denali.c
@@ -0,0 +1,1621 @@
+/*
+ * NAND Flash Controller Device Driver
+ * Copyright © 2009-2010, Intel Corporation and its suppliers.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/wait.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/module.h>
+
+#include "denali.h"
+
+MODULE_LICENSE("GPL");
+
+/*
+ * We define a module parameter that allows the user to override
+ * the hardware and decide what timing mode should be used.
+ */
+#define NAND_DEFAULT_TIMINGS -1
+
+static int onfi_timing_mode = NAND_DEFAULT_TIMINGS;
+module_param(onfi_timing_mode, int, S_IRUGO);
+MODULE_PARM_DESC(onfi_timing_mode,
+ "Overrides default ONFI setting. -1 indicates use default timings");
+
+#define DENALI_NAND_NAME "denali-nand"
+
+/*
+ * We define a macro here that combines all interrupts this driver uses into
+ * a single constant value, for convenience.
+ */
+#define DENALI_IRQ_ALL (INTR_STATUS__DMA_CMD_COMP | \
+ INTR_STATUS__ECC_TRANSACTION_DONE | \
+ INTR_STATUS__ECC_ERR | \
+ INTR_STATUS__PROGRAM_FAIL | \
+ INTR_STATUS__LOAD_COMP | \
+ INTR_STATUS__PROGRAM_COMP | \
+ INTR_STATUS__TIME_OUT | \
+ INTR_STATUS__ERASE_FAIL | \
+ INTR_STATUS__RST_COMP | \
+ INTR_STATUS__ERASE_COMP)
+
+/*
+ * indicates whether or not the internal value for the flash bank is
+ * valid or not
+ */
+#define CHIP_SELECT_INVALID -1
+
+#define SUPPORT_8BITECC 1
+
+/*
+ * This macro divides two integers and rounds fractional values up
+ * to the nearest integer value.
+ */
+#define CEIL_DIV(X, Y) (((X)%(Y)) ? ((X)/(Y)+1) : ((X)/(Y)))
+
+/*
+ * this macro allows us to convert from an MTD structure to our own
+ * device context (denali) structure.
+ */
+#define mtd_to_denali(m) container_of(m, struct denali_nand_info, mtd)
+
+/*
+ * These constants are defined by the driver to enable common driver
+ * configuration options.
+ */
+#define SPARE_ACCESS 0x41
+#define MAIN_ACCESS 0x42
+#define MAIN_SPARE_ACCESS 0x43
+#define PIPELINE_ACCESS 0x2000
+
+#define DENALI_READ 0
+#define DENALI_WRITE 0x100
+
+/* types of device accesses. We can issue commands and get status */
+#define COMMAND_CYCLE 0
+#define ADDR_CYCLE 1
+#define STATUS_CYCLE 2
+
+/*
+ * this is a helper macro that allows us to
+ * format the bank into the proper bits for the controller
+ */
+#define BANK(x) ((x) << 24)
+
+/* forward declarations */
+static void clear_interrupts(struct denali_nand_info *denali);
+static uint32_t wait_for_irq(struct denali_nand_info *denali,
+ uint32_t irq_mask);
+static void denali_irq_enable(struct denali_nand_info *denali,
+ uint32_t int_mask);
+static uint32_t read_interrupt_status(struct denali_nand_info *denali);
+
+/*
+ * Certain operations for the denali NAND controller use an indexed mode to
+ * read/write data. The operation is performed by writing the address value
+ * of the command to the device memory followed by the data. This function
+ * abstracts this common operation.
+ */
+static void index_addr(struct denali_nand_info *denali,
+ uint32_t address, uint32_t data)
+{
+ iowrite32(address, denali->flash_mem);
+ iowrite32(data, denali->flash_mem + 0x10);
+}
+
+/* Perform an indexed read of the device */
+static void index_addr_read_data(struct denali_nand_info *denali,
+ uint32_t address, uint32_t *pdata)
+{
+ iowrite32(address, denali->flash_mem);
+ *pdata = ioread32(denali->flash_mem + 0x10);
+}
+
+/*
+ * We need to buffer some data for some of the NAND core routines.
+ * The operations manage buffering that data.
+ */
+static void reset_buf(struct denali_nand_info *denali)
+{
+ denali->buf.head = denali->buf.tail = 0;
+}
+
+static void write_byte_to_buf(struct denali_nand_info *denali, uint8_t byte)
+{
+ denali->buf.buf[denali->buf.tail++] = byte;
+}
+
+/* reads the status of the device */
+static void read_status(struct denali_nand_info *denali)
+{
+ uint32_t cmd;
+
+ /* initialize the data buffer to store status */
+ reset_buf(denali);
+
+ cmd = ioread32(denali->flash_reg + WRITE_PROTECT);
+ if (cmd)
+ write_byte_to_buf(denali, NAND_STATUS_WP);
+ else
+ write_byte_to_buf(denali, 0);
+}
+
+/* resets a specific device connected to the core */
+static void reset_bank(struct denali_nand_info *denali)
+{
+ uint32_t irq_status;
+ uint32_t irq_mask = INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT;
+
+ clear_interrupts(denali);
+
+ iowrite32(1 << denali->flash_bank, denali->flash_reg + DEVICE_RESET);
+
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ if (irq_status & INTR_STATUS__TIME_OUT)
+ dev_err(denali->dev, "reset bank failed.\n");
+}
+
+/* Reset the flash controller */
+static uint16_t denali_nand_reset(struct denali_nand_info *denali)
+{
+ int i;
+
+ dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
+ __FILE__, __LINE__, __func__);
+
+ for (i = 0; i < denali->max_banks; i++)
+ iowrite32(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT,
+ denali->flash_reg + INTR_STATUS(i));
+
+ for (i = 0; i < denali->max_banks; i++) {
+ iowrite32(1 << i, denali->flash_reg + DEVICE_RESET);
+ while (!(ioread32(denali->flash_reg + INTR_STATUS(i)) &
+ (INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT)))
+ cpu_relax();
+ if (ioread32(denali->flash_reg + INTR_STATUS(i)) &
+ INTR_STATUS__TIME_OUT)
+ dev_dbg(denali->dev,
+ "NAND Reset operation timed out on bank %d\n", i);
+ }
+
+ for (i = 0; i < denali->max_banks; i++)
+ iowrite32(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT,
+ denali->flash_reg + INTR_STATUS(i));
+
+ return PASS;
+}
+
+/*
+ * this routine calculates the ONFI timing values for a given mode and
+ * programs the clocking register accordingly. The mode is determined by
+ * the get_onfi_nand_para routine.
+ */
+static void nand_onfi_timing_set(struct denali_nand_info *denali,
+ uint16_t mode)
+{
+ uint16_t Trea[6] = {40, 30, 25, 20, 20, 16};
+ uint16_t Trp[6] = {50, 25, 17, 15, 12, 10};
+ uint16_t Treh[6] = {30, 15, 15, 10, 10, 7};
+ uint16_t Trc[6] = {100, 50, 35, 30, 25, 20};
+ uint16_t Trhoh[6] = {0, 15, 15, 15, 15, 15};
+ uint16_t Trloh[6] = {0, 0, 0, 0, 5, 5};
+ uint16_t Tcea[6] = {100, 45, 30, 25, 25, 25};
+ uint16_t Tadl[6] = {200, 100, 100, 100, 70, 70};
+ uint16_t Trhw[6] = {200, 100, 100, 100, 100, 100};
+ uint16_t Trhz[6] = {200, 100, 100, 100, 100, 100};
+ uint16_t Twhr[6] = {120, 80, 80, 60, 60, 60};
+ uint16_t Tcs[6] = {70, 35, 25, 25, 20, 15};
+
+ uint16_t data_invalid_rhoh, data_invalid_rloh, data_invalid;
+ uint16_t dv_window = 0;
+ uint16_t en_lo, en_hi;
+ uint16_t acc_clks;
+ uint16_t addr_2_data, re_2_we, re_2_re, we_2_re, cs_cnt;
+
+ dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
+ __FILE__, __LINE__, __func__);
+
+ en_lo = CEIL_DIV(Trp[mode], CLK_X);
+ en_hi = CEIL_DIV(Treh[mode], CLK_X);
+#if ONFI_BLOOM_TIME
+ if ((en_hi * CLK_X) < (Treh[mode] + 2))
+ en_hi++;
+#endif
+
+ if ((en_lo + en_hi) * CLK_X < Trc[mode])
+ en_lo += CEIL_DIV((Trc[mode] - (en_lo + en_hi) * CLK_X), CLK_X);
+
+ if ((en_lo + en_hi) < CLK_MULTI)
+ en_lo += CLK_MULTI - en_lo - en_hi;
+
+ while (dv_window < 8) {
+ data_invalid_rhoh = en_lo * CLK_X + Trhoh[mode];
+
+ data_invalid_rloh = (en_lo + en_hi) * CLK_X + Trloh[mode];
+
+ data_invalid = data_invalid_rhoh < data_invalid_rloh ?
+ data_invalid_rhoh : data_invalid_rloh;
+
+ dv_window = data_invalid - Trea[mode];
+
+ if (dv_window < 8)
+ en_lo++;
+ }
+
+ acc_clks = CEIL_DIV(Trea[mode], CLK_X);
+
+ while (acc_clks * CLK_X - Trea[mode] < 3)
+ acc_clks++;
+
+ if (data_invalid - acc_clks * CLK_X < 2)
+ dev_warn(denali->dev, "%s, Line %d: Warning!\n",
+ __FILE__, __LINE__);
+
+ addr_2_data = CEIL_DIV(Tadl[mode], CLK_X);
+ re_2_we = CEIL_DIV(Trhw[mode], CLK_X);
+ re_2_re = CEIL_DIV(Trhz[mode], CLK_X);
+ we_2_re = CEIL_DIV(Twhr[mode], CLK_X);
+ cs_cnt = CEIL_DIV((Tcs[mode] - Trp[mode]), CLK_X);
+ if (cs_cnt == 0)
+ cs_cnt = 1;
+
+ if (Tcea[mode]) {
+ while (cs_cnt * CLK_X + Trea[mode] < Tcea[mode])
+ cs_cnt++;
+ }
+
+#if MODE5_WORKAROUND
+ if (mode == 5)
+ acc_clks = 5;
+#endif
+
+ /* Sighting 3462430: Temporary hack for MT29F128G08CJABAWP:B */
+ if (ioread32(denali->flash_reg + MANUFACTURER_ID) == 0 &&
+ ioread32(denali->flash_reg + DEVICE_ID) == 0x88)
+ acc_clks = 6;
+
+ iowrite32(acc_clks, denali->flash_reg + ACC_CLKS);
+ iowrite32(re_2_we, denali->flash_reg + RE_2_WE);
+ iowrite32(re_2_re, denali->flash_reg + RE_2_RE);
+ iowrite32(we_2_re, denali->flash_reg + WE_2_RE);
+ iowrite32(addr_2_data, denali->flash_reg + ADDR_2_DATA);
+ iowrite32(en_lo, denali->flash_reg + RDWR_EN_LO_CNT);
+ iowrite32(en_hi, denali->flash_reg + RDWR_EN_HI_CNT);
+ iowrite32(cs_cnt, denali->flash_reg + CS_SETUP_CNT);
+}
+
+/* queries the NAND device to see what ONFI modes it supports. */
+static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
+{
+ int i;
+
+ /*
+ * we needn't to do a reset here because driver has already
+ * reset all the banks before
+ */
+ if (!(ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
+ ONFI_TIMING_MODE__VALUE))
+ return FAIL;
+
+ for (i = 5; i > 0; i--) {
+ if (ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
+ (0x01 << i))
+ break;
+ }
+
+ nand_onfi_timing_set(denali, i);
+
+ /*
+ * By now, all the ONFI devices we know support the page cache
+ * rw feature. So here we enable the pipeline_rw_ahead feature
+ */
+ /* iowrite32(1, denali->flash_reg + CACHE_WRITE_ENABLE); */
+ /* iowrite32(1, denali->flash_reg + CACHE_READ_ENABLE); */
+
+ return PASS;
+}
+
+static void get_samsung_nand_para(struct denali_nand_info *denali,
+ uint8_t device_id)
+{
+ if (device_id == 0xd3) { /* Samsung K9WAG08U1A */
+ /* Set timing register values according to datasheet */
+ iowrite32(5, denali->flash_reg + ACC_CLKS);
+ iowrite32(20, denali->flash_reg + RE_2_WE);
+ iowrite32(12, denali->flash_reg + WE_2_RE);
+ iowrite32(14, denali->flash_reg + ADDR_2_DATA);
+ iowrite32(3, denali->flash_reg + RDWR_EN_LO_CNT);
+ iowrite32(2, denali->flash_reg + RDWR_EN_HI_CNT);
+ iowrite32(2, denali->flash_reg + CS_SETUP_CNT);
+ }
+}
+
+static void get_toshiba_nand_para(struct denali_nand_info *denali)
+{
+ uint32_t tmp;
+
+ /*
+ * Workaround to fix a controller bug which reports a wrong
+ * spare area size for some kind of Toshiba NAND device
+ */
+ if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) &&
+ (ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) {
+ iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
+ tmp = ioread32(denali->flash_reg + DEVICES_CONNECTED) *
+ ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
+ iowrite32(tmp,
+ denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
+#if SUPPORT_15BITECC
+ iowrite32(15, denali->flash_reg + ECC_CORRECTION);
+#elif SUPPORT_8BITECC
+ iowrite32(8, denali->flash_reg + ECC_CORRECTION);
+#endif
+ }
+}
+
+static void get_hynix_nand_para(struct denali_nand_info *denali,
+ uint8_t device_id)
+{
+ uint32_t main_size, spare_size;
+
+ switch (device_id) {
+ case 0xD5: /* Hynix H27UAG8T2A, H27UBG8U5A or H27UCG8VFA */
+ case 0xD7: /* Hynix H27UDG8VEM, H27UCG8UDM or H27UCG8V5A */
+ iowrite32(128, denali->flash_reg + PAGES_PER_BLOCK);
+ iowrite32(4096, denali->flash_reg + DEVICE_MAIN_AREA_SIZE);
+ iowrite32(224, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
+ main_size = 4096 *
+ ioread32(denali->flash_reg + DEVICES_CONNECTED);
+ spare_size = 224 *
+ ioread32(denali->flash_reg + DEVICES_CONNECTED);
+ iowrite32(main_size,
+ denali->flash_reg + LOGICAL_PAGE_DATA_SIZE);
+ iowrite32(spare_size,
+ denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
+ iowrite32(0, denali->flash_reg + DEVICE_WIDTH);
+#if SUPPORT_15BITECC
+ iowrite32(15, denali->flash_reg + ECC_CORRECTION);
+#elif SUPPORT_8BITECC
+ iowrite32(8, denali->flash_reg + ECC_CORRECTION);
+#endif
+ break;
+ default:
+ dev_warn(denali->dev,
+ "Spectra: Unknown Hynix NAND (Device ID: 0x%x).\n"
+ "Will use default parameter values instead.\n",
+ device_id);
+ }
+}
+
+/*
+ * determines how many NAND chips are connected to the controller. Note for
+ * Intel CE4100 devices we don't support more than one device.
+ */
+static void find_valid_banks(struct denali_nand_info *denali)
+{
+ uint32_t id[denali->max_banks];
+ int i;
+
+ denali->total_used_banks = 1;
+ for (i = 0; i < denali->max_banks; i++) {
+ index_addr(denali, MODE_11 | (i << 24) | 0, 0x90);
+ index_addr(denali, MODE_11 | (i << 24) | 1, 0);
+ index_addr_read_data(denali, MODE_11 | (i << 24) | 2, &id[i]);
+
+ dev_dbg(denali->dev,
+ "Return 1st ID for bank[%d]: %x\n", i, id[i]);
+
+ if (i == 0) {
+ if (!(id[i] & 0x0ff))
+ break; /* WTF? */
+ } else {
+ if ((id[i] & 0x0ff) == (id[0] & 0x0ff))
+ denali->total_used_banks++;
+ else
+ break;
+ }
+ }
+
+ if (denali->platform == INTEL_CE4100) {
+ /*
+ * Platform limitations of the CE4100 device limit
+ * users to a single chip solution for NAND.
+ * Multichip support is not enabled.
+ */
+ if (denali->total_used_banks != 1) {
+ dev_err(denali->dev,
+ "Sorry, Intel CE4100 only supports a single NAND device.\n");
+ BUG();
+ }
+ }
+ dev_dbg(denali->dev,
+ "denali->total_used_banks: %d\n", denali->total_used_banks);
+}
+
+/*
+ * Use the configuration feature register to determine the maximum number of
+ * banks that the hardware supports.
+ */
+static void detect_max_banks(struct denali_nand_info *denali)
+{
+ uint32_t features = ioread32(denali->flash_reg + FEATURES);
+
+ denali->max_banks = 2 << (features & FEATURES__N_BANKS);
+}
+
+static void detect_partition_feature(struct denali_nand_info *denali)
+{
+ /*
+ * For MRST platform, denali->fwblks represent the
+ * number of blocks firmware is taken,
+ * FW is in protect partition and MTD driver has no
+ * permission to access it. So let driver know how many
+ * blocks it can't touch.
+ */
+ if (ioread32(denali->flash_reg + FEATURES) & FEATURES__PARTITION) {
+ if ((ioread32(denali->flash_reg + PERM_SRC_ID(1)) &
+ PERM_SRC_ID__SRCID) == SPECTRA_PARTITION_ID) {
+ denali->fwblks =
+ ((ioread32(denali->flash_reg + MIN_MAX_BANK(1)) &
+ MIN_MAX_BANK__MIN_VALUE) *
+ denali->blksperchip)
+ +
+ (ioread32(denali->flash_reg + MIN_BLK_ADDR(1)) &
+ MIN_BLK_ADDR__VALUE);
+ } else {
+ denali->fwblks = SPECTRA_START_BLOCK;
+ }
+ } else {
+ denali->fwblks = SPECTRA_START_BLOCK;
+ }
+}
+
+static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
+{
+ uint16_t status = PASS;
+ uint32_t id_bytes[8], addr;
+ uint8_t maf_id, device_id;
+ int i;
+
+ dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
+ __FILE__, __LINE__, __func__);
+
+ /*
+ * Use read id method to get device ID and other params.
+ * For some NAND chips, controller can't report the correct
+ * device ID by reading from DEVICE_ID register
+ */
+ addr = MODE_11 | BANK(denali->flash_bank);
+ index_addr(denali, addr | 0, 0x90);
+ index_addr(denali, addr | 1, 0);
+ for (i = 0; i < 8; i++)
+ index_addr_read_data(denali, addr | 2, &id_bytes[i]);
+ maf_id = id_bytes[0];
+ device_id = id_bytes[1];
+
+ if (ioread32(denali->flash_reg + ONFI_DEVICE_NO_OF_LUNS) &
+ ONFI_DEVICE_NO_OF_LUNS__ONFI_DEVICE) { /* ONFI 1.0 NAND */
+ if (FAIL == get_onfi_nand_para(denali))
+ return FAIL;
+ } else if (maf_id == 0xEC) { /* Samsung NAND */
+ get_samsung_nand_para(denali, device_id);
+ } else if (maf_id == 0x98) { /* Toshiba NAND */
+ get_toshiba_nand_para(denali);
+ } else if (maf_id == 0xAD) { /* Hynix NAND */
+ get_hynix_nand_para(denali, device_id);
+ }
+
+ dev_info(denali->dev,
+ "Dump timing register values:\n"
+ "acc_clks: %d, re_2_we: %d, re_2_re: %d\n"
+ "we_2_re: %d, addr_2_data: %d, rdwr_en_lo_cnt: %d\n"
+ "rdwr_en_hi_cnt: %d, cs_setup_cnt: %d\n",
+ ioread32(denali->flash_reg + ACC_CLKS),
+ ioread32(denali->flash_reg + RE_2_WE),
+ ioread32(denali->flash_reg + RE_2_RE),
+ ioread32(denali->flash_reg + WE_2_RE),
+ ioread32(denali->flash_reg + ADDR_2_DATA),
+ ioread32(denali->flash_reg + RDWR_EN_LO_CNT),
+ ioread32(denali->flash_reg + RDWR_EN_HI_CNT),
+ ioread32(denali->flash_reg + CS_SETUP_CNT));
+
+ find_valid_banks(denali);
+
+ detect_partition_feature(denali);
+
+ /*
+ * If the user specified to override the default timings
+ * with a specific ONFI mode, we apply those changes here.
+ */
+ if (onfi_timing_mode != NAND_DEFAULT_TIMINGS)
+ nand_onfi_timing_set(denali, onfi_timing_mode);
+
+ return status;
+}
+
+static void denali_set_intr_modes(struct denali_nand_info *denali,
+ uint16_t INT_ENABLE)
+{
+ dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
+ __FILE__, __LINE__, __func__);
+
+ if (INT_ENABLE)
+ iowrite32(1, denali->flash_reg + GLOBAL_INT_ENABLE);
+ else
+ iowrite32(0, denali->flash_reg + GLOBAL_INT_ENABLE);
+}
+
+/*
+ * validation function to verify that the controlling software is making
+ * a valid request
+ */
+static inline bool is_flash_bank_valid(int flash_bank)
+{
+ return flash_bank >= 0 && flash_bank < 4;
+}
+
+static void denali_irq_init(struct denali_nand_info *denali)
+{
+ uint32_t int_mask;
+ int i;
+
+ /* Disable global interrupts */
+ denali_set_intr_modes(denali, false);
+
+ int_mask = DENALI_IRQ_ALL;
+
+ /* Clear all status bits */
+ for (i = 0; i < denali->max_banks; ++i)
+ iowrite32(0xFFFF, denali->flash_reg + INTR_STATUS(i));
+
+ denali_irq_enable(denali, int_mask);
+}
+
+static void denali_irq_cleanup(int irqnum, struct denali_nand_info *denali)
+{
+ denali_set_intr_modes(denali, false);
+ free_irq(irqnum, denali);
+}
+
+static void denali_irq_enable(struct denali_nand_info *denali,
+ uint32_t int_mask)
+{
+ int i;
+
+ for (i = 0; i < denali->max_banks; ++i)
+ iowrite32(int_mask, denali->flash_reg + INTR_EN(i));
+}
+
+/*
+ * This function only returns when an interrupt that this driver cares about
+ * occurs. This is to reduce the overhead of servicing interrupts
+ */
+static inline uint32_t denali_irq_detected(struct denali_nand_info *denali)
+{
+ return read_interrupt_status(denali) & DENALI_IRQ_ALL;
+}
+
+/* Interrupts are cleared by writing a 1 to the appropriate status bit */
+static inline void clear_interrupt(struct denali_nand_info *denali,
+ uint32_t irq_mask)
+{
+ uint32_t intr_status_reg;
+
+ intr_status_reg = INTR_STATUS(denali->flash_bank);
+
+ iowrite32(irq_mask, denali->flash_reg + intr_status_reg);
+}
+
+static void clear_interrupts(struct denali_nand_info *denali)
+{
+ uint32_t status;
+
+ spin_lock_irq(&denali->irq_lock);
+
+ status = read_interrupt_status(denali);
+ clear_interrupt(denali, status);
+
+ denali->irq_status = 0x0;
+ spin_unlock_irq(&denali->irq_lock);
+}
+
+static uint32_t read_interrupt_status(struct denali_nand_info *denali)
+{
+ uint32_t intr_status_reg;
+
+ intr_status_reg = INTR_STATUS(denali->flash_bank);
+
+ return ioread32(denali->flash_reg + intr_status_reg);
+}
+
+/*
+ * This is the interrupt service routine. It handles all interrupts
+ * sent to this device. Note that on CE4100, this is a shared interrupt.
+ */
+static irqreturn_t denali_isr(int irq, void *dev_id)
+{
+ struct denali_nand_info *denali = dev_id;
+ uint32_t irq_status;
+ irqreturn_t result = IRQ_NONE;
+
+ spin_lock(&denali->irq_lock);
+
+ /* check to see if a valid NAND chip has been selected. */
+ if (is_flash_bank_valid(denali->flash_bank)) {
+ /*
+ * check to see if controller generated the interrupt,
+ * since this is a shared interrupt
+ */
+ irq_status = denali_irq_detected(denali);
+ if (irq_status != 0) {
+ /* handle interrupt */
+ /* first acknowledge it */
+ clear_interrupt(denali, irq_status);
+ /*
+ * store the status in the device context for someone
+ * to read
+ */
+ denali->irq_status |= irq_status;
+ /* notify anyone who cares that it happened */
+ complete(&denali->complete);
+ /* tell the OS that we've handled this */
+ result = IRQ_HANDLED;
+ }
+ }
+ spin_unlock(&denali->irq_lock);
+ return result;
+}
+#define BANK(x) ((x) << 24)
+
+static uint32_t wait_for_irq(struct denali_nand_info *denali, uint32_t irq_mask)
+{
+ unsigned long comp_res;
+ uint32_t intr_status;
+ unsigned long timeout = msecs_to_jiffies(1000);
+
+ do {
+ comp_res =
+ wait_for_completion_timeout(&denali->complete, timeout);
+ spin_lock_irq(&denali->irq_lock);
+ intr_status = denali->irq_status;
+
+ if (intr_status & irq_mask) {
+ denali->irq_status &= ~irq_mask;
+ spin_unlock_irq(&denali->irq_lock);
+ /* our interrupt was detected */
+ break;
+ }
+
+ /*
+ * these are not the interrupts you are looking for -
+ * need to wait again
+ */
+ spin_unlock_irq(&denali->irq_lock);
+ } while (comp_res != 0);
+
+ if (comp_res == 0) {
+ /* timeout */
+ pr_err("timeout occurred, status = 0x%x, mask = 0x%x\n",
+ intr_status, irq_mask);
+
+ intr_status = 0;
+ }
+ return intr_status;
+}
+
+/*
+ * This helper function setups the registers for ECC and whether or not
+ * the spare area will be transferred.
+ */
+static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en,
+ bool transfer_spare)
+{
+ int ecc_en_flag, transfer_spare_flag;
+
+ /* set ECC, transfer spare bits if needed */
+ ecc_en_flag = ecc_en ? ECC_ENABLE__FLAG : 0;
+ transfer_spare_flag = transfer_spare ? TRANSFER_SPARE_REG__FLAG : 0;
+
+ /* Enable spare area/ECC per user's request. */
+ iowrite32(ecc_en_flag, denali->flash_reg + ECC_ENABLE);
+ iowrite32(transfer_spare_flag, denali->flash_reg + TRANSFER_SPARE_REG);
+}
+
+/*
+ * sends a pipeline command operation to the controller. See the Denali NAND
+ * controller's user guide for more information (section 4.2.3.6).
+ */
+static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
+ bool ecc_en, bool transfer_spare,
+ int access_type, int op)
+{
+ int status = PASS;
+ uint32_t page_count = 1;
+ uint32_t addr, cmd, irq_status, irq_mask;
+
+ if (op == DENALI_READ)
+ irq_mask = INTR_STATUS__LOAD_COMP;
+ else if (op == DENALI_WRITE)
+ irq_mask = 0;
+ else
+ BUG();
+
+ setup_ecc_for_xfer(denali, ecc_en, transfer_spare);
+
+ clear_interrupts(denali);
+
+ addr = BANK(denali->flash_bank) | denali->page;
+
+ if (op == DENALI_WRITE && access_type != SPARE_ACCESS) {
+ cmd = MODE_01 | addr;
+ iowrite32(cmd, denali->flash_mem);
+ } else if (op == DENALI_WRITE && access_type == SPARE_ACCESS) {
+ /* read spare area */
+ cmd = MODE_10 | addr;
+ index_addr(denali, cmd, access_type);
+
+ cmd = MODE_01 | addr;
+ iowrite32(cmd, denali->flash_mem);
+ } else if (op == DENALI_READ) {
+ /* setup page read request for access type */
+ cmd = MODE_10 | addr;
+ index_addr(denali, cmd, access_type);
+
+ /*
+ * page 33 of the NAND controller spec indicates we should not
+ * use the pipeline commands in Spare area only mode.
+ * So we don't.
+ */
+ if (access_type == SPARE_ACCESS) {
+ cmd = MODE_01 | addr;
+ iowrite32(cmd, denali->flash_mem);
+ } else {
+ index_addr(denali, cmd,
+ PIPELINE_ACCESS | op | page_count);
+
+ /*
+ * wait for command to be accepted
+ * can always use status0 bit as the
+ * mask is identical for each bank.
+ */
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ if (irq_status == 0) {
+ dev_err(denali->dev,
+ "cmd, page, addr on timeout (0x%x, 0x%x, 0x%x)\n",
+ cmd, denali->page, addr);
+ status = FAIL;
+ } else {
+ cmd = MODE_01 | addr;
+ iowrite32(cmd, denali->flash_mem);
+ }
+ }
+ }
+ return status;
+}
+
+/* helper function that simply writes a buffer to the flash */
+static int write_data_to_flash_mem(struct denali_nand_info *denali,
+ const uint8_t *buf, int len)
+{
+ uint32_t *buf32;
+ int i;
+
+ /*
+ * verify that the len is a multiple of 4.
+ * see comment in read_data_from_flash_mem()
+ */
+ BUG_ON((len % 4) != 0);
+
+ /* write the data to the flash memory */
+ buf32 = (uint32_t *)buf;
+ for (i = 0; i < len / 4; i++)
+ iowrite32(*buf32++, denali->flash_mem + 0x10);
+ return i * 4; /* intent is to return the number of bytes read */
+}
+
+/* helper function that simply reads a buffer from the flash */
+static int read_data_from_flash_mem(struct denali_nand_info *denali,
+ uint8_t *buf, int len)
+{
+ uint32_t *buf32;
+ int i;
+
+ /*
+ * we assume that len will be a multiple of 4, if not it would be nice
+ * to know about it ASAP rather than have random failures...
+ * This assumption is based on the fact that this function is designed
+ * to be used to read flash pages, which are typically multiples of 4.
+ */
+ BUG_ON((len % 4) != 0);
+
+ /* transfer the data from the flash */
+ buf32 = (uint32_t *)buf;
+ for (i = 0; i < len / 4; i++)
+ *buf32++ = ioread32(denali->flash_mem + 0x10);
+ return i * 4; /* intent is to return the number of bytes read */
+}
+
+/* writes OOB data to the device */
+static int write_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint32_t irq_status;
+ uint32_t irq_mask = INTR_STATUS__PROGRAM_COMP |
+ INTR_STATUS__PROGRAM_FAIL;
+ int status = 0;
+
+ denali->page = page;
+
+ if (denali_send_pipeline_cmd(denali, false, false, SPARE_ACCESS,
+ DENALI_WRITE) == PASS) {
+ write_data_to_flash_mem(denali, buf, mtd->oobsize);
+
+ /* wait for operation to complete */
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ if (irq_status == 0) {
+ dev_err(denali->dev, "OOB write failed\n");
+ status = -EIO;
+ }
+ } else {
+ dev_err(denali->dev, "unable to send pipeline command\n");
+ status = -EIO;
+ }
+ return status;
+}
+
+/* reads OOB data from the device */
+static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint32_t irq_mask = INTR_STATUS__LOAD_COMP;
+ uint32_t irq_status, addr, cmd;
+
+ denali->page = page;
+
+ if (denali_send_pipeline_cmd(denali, false, true, SPARE_ACCESS,
+ DENALI_READ) == PASS) {
+ read_data_from_flash_mem(denali, buf, mtd->oobsize);
+
+ /*
+ * wait for command to be accepted
+ * can always use status0 bit as the
+ * mask is identical for each bank.
+ */
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ if (irq_status == 0)
+ dev_err(denali->dev, "page on OOB timeout %d\n",
+ denali->page);
+
+ /*
+ * We set the device back to MAIN_ACCESS here as I observed
+ * instability with the controller if you do a block erase
+ * and the last transaction was a SPARE_ACCESS. Block erase
+ * is reliable (according to the MTD test infrastructure)
+ * if you are in MAIN_ACCESS.
+ */
+ addr = BANK(denali->flash_bank) | denali->page;
+ cmd = MODE_10 | addr;
+ index_addr(denali, cmd, MAIN_ACCESS);
+ }
+}
+
+/*
+ * this function examines buffers to see if they contain data that
+ * indicate that the buffer is part of an erased region of flash.
+ */
+static bool is_erased(uint8_t *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (buf[i] != 0xFF)
+ return false;
+ return true;
+}
+#define ECC_SECTOR_SIZE 512
+
+#define ECC_SECTOR(x) (((x) & ECC_ERROR_ADDRESS__SECTOR_NR) >> 12)
+#define ECC_BYTE(x) (((x) & ECC_ERROR_ADDRESS__OFFSET))
+#define ECC_CORRECTION_VALUE(x) ((x) & ERR_CORRECTION_INFO__BYTEMASK)
+#define ECC_ERROR_CORRECTABLE(x) (!((x) & ERR_CORRECTION_INFO__ERROR_TYPE))
+#define ECC_ERR_DEVICE(x) (((x) & ERR_CORRECTION_INFO__DEVICE_NR) >> 8)
+#define ECC_LAST_ERR(x) ((x) & ERR_CORRECTION_INFO__LAST_ERR_INFO)
+
+static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
+ uint32_t irq_status, unsigned int *max_bitflips)
+{
+ bool check_erased_page = false;
+ unsigned int bitflips = 0;
+
+ if (irq_status & INTR_STATUS__ECC_ERR) {
+ /* read the ECC errors. we'll ignore them for now */
+ uint32_t err_address, err_correction_info, err_byte,
+ err_sector, err_device, err_correction_value;
+ denali_set_intr_modes(denali, false);
+
+ do {
+ err_address = ioread32(denali->flash_reg +
+ ECC_ERROR_ADDRESS);
+ err_sector = ECC_SECTOR(err_address);
+ err_byte = ECC_BYTE(err_address);
+
+ err_correction_info = ioread32(denali->flash_reg +
+ ERR_CORRECTION_INFO);
+ err_correction_value =
+ ECC_CORRECTION_VALUE(err_correction_info);
+ err_device = ECC_ERR_DEVICE(err_correction_info);
+
+ if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
+ /*
+ * If err_byte is larger than ECC_SECTOR_SIZE,
+ * means error happened in OOB, so we ignore
+ * it. It's no need for us to correct it
+ * err_device is represented the NAND error
+ * bits are happened in if there are more
+ * than one NAND connected.
+ */
+ if (err_byte < ECC_SECTOR_SIZE) {
+ int offset;
+
+ offset = (err_sector *
+ ECC_SECTOR_SIZE +
+ err_byte) *
+ denali->devnum +
+ err_device;
+ /* correct the ECC error */
+ buf[offset] ^= err_correction_value;
+ denali->mtd.ecc_stats.corrected++;
+ bitflips++;
+ }
+ } else {
+ /*
+ * if the error is not correctable, need to
+ * look at the page to see if it is an erased
+ * page. if so, then it's not a real ECC error
+ */
+ check_erased_page = true;
+ }
+ } while (!ECC_LAST_ERR(err_correction_info));
+ /*
+ * Once handle all ecc errors, controller will triger
+ * a ECC_TRANSACTION_DONE interrupt, so here just wait
+ * for a while for this interrupt
+ */
+ while (!(read_interrupt_status(denali) &
+ INTR_STATUS__ECC_TRANSACTION_DONE))
+ cpu_relax();
+ clear_interrupts(denali);
+ denali_set_intr_modes(denali, true);
+ }
+ *max_bitflips = bitflips;
+ return check_erased_page;
+}
+
+/* programs the controller to either enable/disable DMA transfers */
+static void denali_enable_dma(struct denali_nand_info *denali, bool en)
+{
+ iowrite32(en ? DMA_ENABLE__FLAG : 0, denali->flash_reg + DMA_ENABLE);
+ ioread32(denali->flash_reg + DMA_ENABLE);
+}
+
+/* setups the HW to perform the data DMA */
+static void denali_setup_dma(struct denali_nand_info *denali, int op)
+{
+ uint32_t mode;
+ const int page_count = 1;
+ uint32_t addr = denali->buf.dma_buf;
+
+ mode = MODE_10 | BANK(denali->flash_bank);
+
+ /* DMA is a four step process */
+
+ /* 1. setup transfer type and # of pages */
+ index_addr(denali, mode | denali->page, 0x2000 | op | page_count);
+
+ /* 2. set memory high address bits 23:8 */
+ index_addr(denali, mode | ((addr >> 16) << 8), 0x2200);
+
+ /* 3. set memory low address bits 23:8 */
+ index_addr(denali, mode | ((addr & 0xffff) << 8), 0x2300);
+
+ /* 4. interrupt when complete, burst len = 64 bytes */
+ index_addr(denali, mode | 0x14000, 0x2400);
+}
+
+/*
+ * writes a page. user specifies type, and this function handles the
+ * configuration details.
+ */
+static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, bool raw_xfer)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ dma_addr_t addr = denali->buf.dma_buf;
+ size_t size = denali->mtd.writesize + denali->mtd.oobsize;
+ uint32_t irq_status;
+ uint32_t irq_mask = INTR_STATUS__DMA_CMD_COMP |
+ INTR_STATUS__PROGRAM_FAIL;
+
+ /*
+ * if it is a raw xfer, we want to disable ecc and send the spare area.
+ * !raw_xfer - enable ecc
+ * raw_xfer - transfer spare
+ */
+ setup_ecc_for_xfer(denali, !raw_xfer, raw_xfer);
+
+ /* copy buffer into DMA buffer */
+ memcpy(denali->buf.buf, buf, mtd->writesize);
+
+ if (raw_xfer) {
+ /* transfer the data to the spare area */
+ memcpy(denali->buf.buf + mtd->writesize,
+ chip->oob_poi,
+ mtd->oobsize);
+ }
+
+ dma_sync_single_for_device(denali->dev, addr, size, DMA_TO_DEVICE);
+
+ clear_interrupts(denali);
+ denali_enable_dma(denali, true);
+
+ denali_setup_dma(denali, DENALI_WRITE);
+
+ /* wait for operation to complete */
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ if (irq_status == 0) {
+ dev_err(denali->dev, "timeout on write_page (type = %d)\n",
+ raw_xfer);
+ denali->status = NAND_STATUS_FAIL;
+ }
+
+ denali_enable_dma(denali, false);
+ dma_sync_single_for_cpu(denali->dev, addr, size, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+/* NAND core entry points */
+
+/*
+ * this is the callback that the NAND core calls to write a page. Since
+ * writing a page with ECC or without is similar, all the work is done
+ * by write_page above.
+ */
+static int denali_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_required)
+{
+ /*
+ * for regular page writes, we let HW handle all the ECC
+ * data written to the device.
+ */
+ return write_page(mtd, chip, buf, false);
+}
+
+/*
+ * This is the callback that the NAND core calls to write a page without ECC.
+ * raw access is similar to ECC page writes, so all the work is done in the
+ * write_page() function above.
+ */
+static int denali_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_required)
+{
+ /*
+ * for raw page writes, we want to disable ECC and simply write
+ * whatever data is in the buffer.
+ */
+ return write_page(mtd, chip, buf, true);
+}
+
+static int denali_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ return write_oob_data(mtd, chip->oob_poi, page);
+}
+
+static int denali_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ read_oob_data(mtd, chip->oob_poi, page);
+
+ return 0;
+}
+
+static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ unsigned int max_bitflips;
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+
+ dma_addr_t addr = denali->buf.dma_buf;
+ size_t size = denali->mtd.writesize + denali->mtd.oobsize;
+
+ uint32_t irq_status;
+ uint32_t irq_mask = INTR_STATUS__ECC_TRANSACTION_DONE |
+ INTR_STATUS__ECC_ERR;
+ bool check_erased_page = false;
+
+ if (page != denali->page) {
+ dev_err(denali->dev,
+ "IN %s: page %d is not equal to denali->page %d",
+ __func__, page, denali->page);
+ BUG();
+ }
+
+ setup_ecc_for_xfer(denali, true, false);
+
+ denali_enable_dma(denali, true);
+ dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);
+
+ clear_interrupts(denali);
+ denali_setup_dma(denali, DENALI_READ);
+
+ /* wait for operation to complete */
+ irq_status = wait_for_irq(denali, irq_mask);
+
+ dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);
+
+ memcpy(buf, denali->buf.buf, mtd->writesize);
+
+ check_erased_page = handle_ecc(denali, buf, irq_status, &max_bitflips);
+ denali_enable_dma(denali, false);
+
+ if (check_erased_page) {
+ read_oob_data(&denali->mtd, chip->oob_poi, denali->page);
+
+ /* check ECC failures that may have occurred on erased pages */
+ if (check_erased_page) {
+ if (!is_erased(buf, denali->mtd.writesize))
+ denali->mtd.ecc_stats.failed++;
+ if (!is_erased(buf, denali->mtd.oobsize))
+ denali->mtd.ecc_stats.failed++;
+ }
+ }
+ return max_bitflips;
+}
+
+static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ dma_addr_t addr = denali->buf.dma_buf;
+ size_t size = denali->mtd.writesize + denali->mtd.oobsize;
+ uint32_t irq_mask = INTR_STATUS__DMA_CMD_COMP;
+
+ if (page != denali->page) {
+ dev_err(denali->dev,
+ "IN %s: page %d is not equal to denali->page %d",
+ __func__, page, denali->page);
+ BUG();
+ }
+
+ setup_ecc_for_xfer(denali, false, true);
+ denali_enable_dma(denali, true);
+
+ dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);
+
+ clear_interrupts(denali);
+ denali_setup_dma(denali, DENALI_READ);
+
+ /* wait for operation to complete */
+ wait_for_irq(denali, irq_mask);
+
+ dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);
+
+ denali_enable_dma(denali, false);
+
+ memcpy(buf, denali->buf.buf, mtd->writesize);
+ memcpy(chip->oob_poi, denali->buf.buf + mtd->writesize, mtd->oobsize);
+
+ return 0;
+}
+
+static uint8_t denali_read_byte(struct mtd_info *mtd)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint8_t result = 0xff;
+
+ if (denali->buf.head < denali->buf.tail)
+ result = denali->buf.buf[denali->buf.head++];
+
+ return result;
+}
+
+static void denali_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+
+ spin_lock_irq(&denali->irq_lock);
+ denali->flash_bank = chip;
+ spin_unlock_irq(&denali->irq_lock);
+}
+
+static int denali_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ int status = denali->status;
+
+ denali->status = 0;
+
+ return status;
+}
+
+static int denali_erase(struct mtd_info *mtd, int page)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+
+ uint32_t cmd, irq_status;
+
+ clear_interrupts(denali);
+
+ /* setup page read request for access type */
+ cmd = MODE_10 | BANK(denali->flash_bank) | page;
+ index_addr(denali, cmd, 0x1);
+
+ /* wait for erase to complete or failure to occur */
+ irq_status = wait_for_irq(denali, INTR_STATUS__ERASE_COMP |
+ INTR_STATUS__ERASE_FAIL);
+
+ return irq_status & INTR_STATUS__ERASE_FAIL ? NAND_STATUS_FAIL : PASS;
+}
+
+static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
+ int page)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint32_t addr, id;
+ int i;
+
+ switch (cmd) {
+ case NAND_CMD_PAGEPROG:
+ break;
+ case NAND_CMD_STATUS:
+ read_status(denali);
+ break;
+ case NAND_CMD_READID:
+ case NAND_CMD_PARAM:
+ reset_buf(denali);
+ /*
+ * sometimes ManufactureId read from register is not right
+ * e.g. some of Micron MT29F32G08QAA MLC NAND chips
+ * So here we send READID cmd to NAND insteand
+ */
+ addr = MODE_11 | BANK(denali->flash_bank);
+ index_addr(denali, addr | 0, 0x90);
+ index_addr(denali, addr | 1, 0);
+ for (i = 0; i < 8; i++) {
+ index_addr_read_data(denali, addr | 2, &id);
+ write_byte_to_buf(denali, id);
+ }
+ break;
+ case NAND_CMD_READ0:
+ case NAND_CMD_SEQIN:
+ denali->page = page;
+ break;
+ case NAND_CMD_RESET:
+ reset_bank(denali);
+ break;
+ case NAND_CMD_READOOB:
+ /* TODO: Read OOB data */
+ break;
+ default:
+ pr_err(": unsupported command received 0x%x\n", cmd);
+ break;
+ }
+}
+/* end NAND core entry points */
+
+/* Initialization code to bring the device up to a known good state */
+static void denali_hw_init(struct denali_nand_info *denali)
+{
+ /*
+ * tell driver how many bit controller will skip before
+ * writing ECC code in OOB, this register may be already
+ * set by firmware. So we read this value out.
+ * if this value is 0, just let it be.
+ */
+ denali->bbtskipbytes = ioread32(denali->flash_reg +
+ SPARE_AREA_SKIP_BYTES);
+ detect_max_banks(denali);
+ denali_nand_reset(denali);
+ iowrite32(0x0F, denali->flash_reg + RB_PIN_ENABLED);
+ iowrite32(CHIP_EN_DONT_CARE__FLAG,
+ denali->flash_reg + CHIP_ENABLE_DONT_CARE);
+
+ iowrite32(0xffff, denali->flash_reg + SPARE_AREA_MARKER);
+
+ /* Should set value for these registers when init */
+ iowrite32(0, denali->flash_reg + TWO_ROW_ADDR_CYCLES);
+ iowrite32(1, denali->flash_reg + ECC_ENABLE);
+ denali_nand_timing_set(denali);
+ denali_irq_init(denali);
+}
+
+/*
+ * Althogh controller spec said SLC ECC is forceb to be 4bit,
+ * but denali controller in MRST only support 15bit and 8bit ECC
+ * correction
+ */
+#define ECC_8BITS 14
+static struct nand_ecclayout nand_8bit_oob = {
+ .eccbytes = 14,
+};
+
+#define ECC_15BITS 26
+static struct nand_ecclayout nand_15bit_oob = {
+ .eccbytes = 26,
+};
+
+static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
+static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+ .offs = 8,
+ .len = 4,
+ .veroffs = 12,
+ .maxblocks = 4,
+ .pattern = bbt_pattern,
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+ .offs = 8,
+ .len = 4,
+ .veroffs = 12,
+ .maxblocks = 4,
+ .pattern = mirror_pattern,
+};
+
+/* initialize driver data structures */
+static void denali_drv_init(struct denali_nand_info *denali)
+{
+ denali->idx = 0;
+
+ /* setup interrupt handler */
+ /*
+ * the completion object will be used to notify
+ * the callee that the interrupt is done
+ */
+ init_completion(&denali->complete);
+
+ /*
+ * the spinlock will be used to synchronize the ISR with any
+ * element that might be access shared data (interrupt status)
+ */
+ spin_lock_init(&denali->irq_lock);
+
+ /* indicate that MTD has not selected a valid bank yet */
+ denali->flash_bank = CHIP_SELECT_INVALID;
+
+ /* initialize our irq_status variable to indicate no interrupts */
+ denali->irq_status = 0;
+}
+
+int denali_init(struct denali_nand_info *denali)
+{
+ int ret;
+
+ if (denali->platform == INTEL_CE4100) {
+ /*
+ * Due to a silicon limitation, we can only support
+ * ONFI timing mode 1 and below.
+ */
+ if (onfi_timing_mode < -1 || onfi_timing_mode > 1) {
+ pr_err("Intel CE4100 only supports ONFI timing mode 1 or below\n");
+ return -EINVAL;
+ }
+ }
+
+ /* allocate a temporary buffer for nand_scan_ident() */
+ denali->buf.buf = devm_kzalloc(denali->dev, PAGE_SIZE,
+ GFP_DMA | GFP_KERNEL);
+ if (!denali->buf.buf)
+ return -ENOMEM;
+
+ denali->mtd.dev.parent = denali->dev;
+ denali_hw_init(denali);
+ denali_drv_init(denali);
+
+ /*
+ * denali_isr register is done after all the hardware
+ * initilization is finished
+ */
+ if (request_irq(denali->irq, denali_isr, IRQF_SHARED,
+ DENALI_NAND_NAME, denali)) {
+ pr_err("Spectra: Unable to allocate IRQ\n");
+ return -ENODEV;
+ }
+
+ /* now that our ISR is registered, we can enable interrupts */
+ denali_set_intr_modes(denali, true);
+ denali->mtd.name = "denali-nand";
+ denali->mtd.owner = THIS_MODULE;
+ denali->mtd.priv = &denali->nand;
+
+ /* register the driver with the NAND core subsystem */
+ denali->nand.select_chip = denali_select_chip;
+ denali->nand.cmdfunc = denali_cmdfunc;
+ denali->nand.read_byte = denali_read_byte;
+ denali->nand.waitfunc = denali_waitfunc;
+
+ /*
+ * scan for NAND devices attached to the controller
+ * this is the first stage in a two step process to register
+ * with the nand subsystem
+ */
+ if (nand_scan_ident(&denali->mtd, denali->max_banks, NULL)) {
+ ret = -ENXIO;
+ goto failed_req_irq;
+ }
+
+ /* allocate the right size buffer now */
+ devm_kfree(denali->dev, denali->buf.buf);
+ denali->buf.buf = devm_kzalloc(denali->dev,
+ denali->mtd.writesize + denali->mtd.oobsize,
+ GFP_KERNEL);
+ if (!denali->buf.buf) {
+ ret = -ENOMEM;
+ goto failed_req_irq;
+ }
+
+ /* Is 32-bit DMA supported? */
+ ret = dma_set_mask(denali->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ pr_err("Spectra: no usable DMA configuration\n");
+ goto failed_req_irq;
+ }
+
+ denali->buf.dma_buf = dma_map_single(denali->dev, denali->buf.buf,
+ denali->mtd.writesize + denali->mtd.oobsize,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(denali->dev, denali->buf.dma_buf)) {
+ dev_err(denali->dev, "Spectra: failed to map DMA buffer\n");
+ ret = -EIO;
+ goto failed_req_irq;
+ }
+
+ /*
+ * support for multi nand
+ * MTD known nothing about multi nand, so we should tell it
+ * the real pagesize and anything necessery
+ */
+ denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
+ denali->nand.chipsize <<= (denali->devnum - 1);
+ denali->nand.page_shift += (denali->devnum - 1);
+ denali->nand.pagemask = (denali->nand.chipsize >>
+ denali->nand.page_shift) - 1;
+ denali->nand.bbt_erase_shift += (denali->devnum - 1);
+ denali->nand.phys_erase_shift = denali->nand.bbt_erase_shift;
+ denali->nand.chip_shift += (denali->devnum - 1);
+ denali->mtd.writesize <<= (denali->devnum - 1);
+ denali->mtd.oobsize <<= (denali->devnum - 1);
+ denali->mtd.erasesize <<= (denali->devnum - 1);
+ denali->mtd.size = denali->nand.numchips * denali->nand.chipsize;
+ denali->bbtskipbytes *= denali->devnum;
+
+ /*
+ * second stage of the NAND scan
+ * this stage requires information regarding ECC and
+ * bad block management.
+ */
+
+ /* Bad block management */
+ denali->nand.bbt_td = &bbt_main_descr;
+ denali->nand.bbt_md = &bbt_mirror_descr;
+
+ /* skip the scan for now until we have OOB read and write support */
+ denali->nand.bbt_options |= NAND_BBT_USE_FLASH;
+ denali->nand.options |= NAND_SKIP_BBTSCAN;
+ denali->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
+
+ /* no subpage writes on denali */
+ denali->nand.options |= NAND_NO_SUBPAGE_WRITE;
+
+ /*
+ * Denali Controller only support 15bit and 8bit ECC in MRST,
+ * so just let controller do 15bit ECC for MLC and 8bit ECC for
+ * SLC if possible.
+ * */
+ if (!nand_is_slc(&denali->nand) &&
+ (denali->mtd.oobsize > (denali->bbtskipbytes +
+ ECC_15BITS * (denali->mtd.writesize /
+ ECC_SECTOR_SIZE)))) {
+ /* if MLC OOB size is large enough, use 15bit ECC*/
+ denali->nand.ecc.strength = 15;
+ denali->nand.ecc.layout = &nand_15bit_oob;
+ denali->nand.ecc.bytes = ECC_15BITS;
+ iowrite32(15, denali->flash_reg + ECC_CORRECTION);
+ } else if (denali->mtd.oobsize < (denali->bbtskipbytes +
+ ECC_8BITS * (denali->mtd.writesize /
+ ECC_SECTOR_SIZE))) {
+ pr_err("Your NAND chip OOB is not large enough to contain 8bit ECC correction codes");
+ goto failed_req_irq;
+ } else {
+ denali->nand.ecc.strength = 8;
+ denali->nand.ecc.layout = &nand_8bit_oob;
+ denali->nand.ecc.bytes = ECC_8BITS;
+ iowrite32(8, denali->flash_reg + ECC_CORRECTION);
+ }
+
+ denali->nand.ecc.bytes *= denali->devnum;
+ denali->nand.ecc.strength *= denali->devnum;
+ denali->nand.ecc.layout->eccbytes *=
+ denali->mtd.writesize / ECC_SECTOR_SIZE;
+ denali->nand.ecc.layout->oobfree[0].offset =
+ denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
+ denali->nand.ecc.layout->oobfree[0].length =
+ denali->mtd.oobsize - denali->nand.ecc.layout->eccbytes -
+ denali->bbtskipbytes;
+
+ /*
+ * Let driver know the total blocks number and how many blocks
+ * contained by each nand chip. blksperchip will help driver to
+ * know how many blocks is taken by FW.
+ */
+ denali->totalblks = denali->mtd.size >> denali->nand.phys_erase_shift;
+ denali->blksperchip = denali->totalblks / denali->nand.numchips;
+
+ /* override the default read operations */
+ denali->nand.ecc.size = ECC_SECTOR_SIZE * denali->devnum;
+ denali->nand.ecc.read_page = denali_read_page;
+ denali->nand.ecc.read_page_raw = denali_read_page_raw;
+ denali->nand.ecc.write_page = denali_write_page;
+ denali->nand.ecc.write_page_raw = denali_write_page_raw;
+ denali->nand.ecc.read_oob = denali_read_oob;
+ denali->nand.ecc.write_oob = denali_write_oob;
+ denali->nand.erase = denali_erase;
+
+ if (nand_scan_tail(&denali->mtd)) {
+ ret = -ENXIO;
+ goto failed_req_irq;
+ }
+
+ ret = mtd_device_register(&denali->mtd, NULL, 0);
+ if (ret) {
+ dev_err(denali->dev, "Spectra: Failed to register MTD: %d\n",
+ ret);
+ goto failed_req_irq;
+ }
+ return 0;
+
+failed_req_irq:
+ denali_irq_cleanup(denali->irq, denali);
+
+ return ret;
+}
+EXPORT_SYMBOL(denali_init);
+
+/* driver exit point */
+void denali_remove(struct denali_nand_info *denali)
+{
+ denali_irq_cleanup(denali->irq, denali);
+ dma_unmap_single(denali->dev, denali->buf.dma_buf,
+ denali->mtd.writesize + denali->mtd.oobsize,
+ DMA_BIDIRECTIONAL);
+}
+EXPORT_SYMBOL(denali_remove);