--- /dev/null
+
+/***************************************************************************
+ * Copyright (C) 2009 by Alexei Babich *
+ * Rezonans plc., Chelyabinsk, Russia *
+ * impatt@mail.ru *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 2 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * 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., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+/*
+ * Freescale iMX3* OpenOCD NAND Flash controller support.
+ *
+ * Many thanks to Ben Dooks for writing s3c24xx driver.
+ */
+
+/*
+driver tested with STMicro NAND512W3A @imx31
+tested "nand probe #", "nand erase # 0 #", "nand dump # file 0 #", "nand write # file 0"
+get_next_halfword_from_sram_buffer() not tested
+*/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mx3_nand.h"
+
+static const char target_not_halted_err_msg[] =
+ "target must be halted to use mx3 NAND flash controller";
+static const char data_block_size_err_msg[] =
+ "minimal granularity is one half-word, %d is incorrect";
+static const char sram_buffer_bounds_err_msg[] =
+ "trying to access out of SRAM buffer bound (addr=0x%x)";
+static const char invalid_command_sequense_err_msg[] =
+ "invalid command sequence in %s";
+static const char get_status_register_err_msg[] = "can't get NAND status";
+static uint32_t in_sram_address;
+unsigned char sign_of_sequental_byte_read;
+
+static int test_iomux_settings (target_t * target, uint32_t value,
+ uint32_t mask, const char *text);
+static int initialize_nf_controller (struct nand_device_s *device);
+static int get_next_byte_from_sram_buffer (target_t * target, uint8_t * value);
+static int get_next_halfword_from_sram_buffer (target_t * target,
+ uint16_t * value);
+static int poll_for_complete_op (target_t * target, const char *text);
+static int validate_target_state (struct nand_device_s *device);
+static int do_data_output (struct nand_device_s *device);
+
+static int imx31_nand_device_command (struct command_context_s *cmd_ctx,
+ char *cmd, char **args, int argc,
+ struct nand_device_s *device);
+static int imx31_init (struct nand_device_s *device);
+static int imx31_read_data (struct nand_device_s *device, void *data);
+static int imx31_write_data (struct nand_device_s *device, uint16_t data);
+static int imx31_nand_ready (struct nand_device_s *device, int timeout);
+static int imx31_register_commands (struct command_context_s *cmd_ctx);
+static int imx31_reset (struct nand_device_s *device);
+static int imx31_command (struct nand_device_s *device, uint8_t command);
+static int imx31_address (struct nand_device_s *device, uint8_t address);
+static int imx31_controller_ready (struct nand_device_s *device, int tout);
+static int imx31_write_page (struct nand_device_s *device, uint32_t page,
+ uint8_t * data, uint32_t data_size, uint8_t * oob,
+ uint32_t oob_size);
+static int imx31_read_page (struct nand_device_s *device, uint32_t page,
+ uint8_t * data, uint32_t data_size, uint8_t * oob,
+ uint32_t oob_size);
+
+nand_flash_controller_t imx31_nand_flash_controller = {
+ .name = "imx31",
+ .nand_device_command = imx31_nand_device_command,
+ .register_commands = imx31_register_commands,
+ .init = imx31_init,
+ .reset = imx31_reset,
+ .command = imx31_command,
+ .address = imx31_address,
+ .write_data = imx31_write_data,
+ .read_data = imx31_read_data,
+ .write_page = imx31_write_page,
+ .read_page = imx31_read_page,
+ .controller_ready = imx31_controller_ready,
+ .nand_ready = imx31_nand_ready,
+};
+
+static int imx31_nand_device_command (struct command_context_s *cmd_ctx,
+ char *cmd, char **args, int argc,
+ struct nand_device_s *device)
+{
+ mx3_nf_controller_t *mx3_nf_info;
+ mx3_nf_info = malloc (sizeof (mx3_nf_controller_t));
+ if (mx3_nf_info == NULL)
+ {
+ LOG_ERROR ("no memory for nand controller");
+ return ERROR_FAIL;
+ }
+
+ device->controller_priv = mx3_nf_info;
+
+ mx3_nf_info->target = get_target (args[1]);
+ if (mx3_nf_info->target == NULL)
+ {
+ LOG_ERROR ("target '%s' not defined", args[1]);
+ return ERROR_FAIL;
+ }
+ if (argc < 3)
+ {
+ LOG_ERROR ("use \"nand device imx31 target noecc|hwecc\"");
+ return ERROR_FAIL;
+ }
+ /*
+ * check hwecc requirements
+ */
+ {
+ int hwecc_needed;
+ hwecc_needed = strcmp (args[2], "hwecc");
+ if (hwecc_needed == 0)
+ {
+ mx3_nf_info->flags.hw_ecc_enabled = 1;
+ }
+ else
+ {
+ mx3_nf_info->flags.hw_ecc_enabled = 0;
+ }
+ }
+
+ mx3_nf_info->optype = MX3_NF_DATAOUT_PAGE;
+ mx3_nf_info->fin = MX3_NF_FIN_NONE;
+ mx3_nf_info->flags.target_little_endian =
+ (mx3_nf_info->target->endianness == TARGET_LITTLE_ENDIAN);
+ /*
+ * testing host endianess
+ */
+ {
+ int x = 1;
+ if (*(char *) &x == 1)
+ {
+ mx3_nf_info->flags.host_little_endian = 1;
+ }
+ else
+ {
+ mx3_nf_info->flags.host_little_endian = 0;
+ }
+ }
+ return ERROR_OK;
+}
+
+static int imx31_init (struct nand_device_s *device)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+
+ {
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ }
+
+ {
+ uint16_t buffsize_register_content;
+ target_read_u16 (target, MX3_NF_BUFSIZ, &buffsize_register_content);
+ mx3_nf_info->flags.one_kb_sram = !(buffsize_register_content & 0x000f);
+ }
+
+ {
+ uint32_t pcsr_register_content;
+ target_read_u32 (target, MX3_PCSR, &pcsr_register_content);
+ if (!device->bus_width)
+ {
+ device->bus_width =
+ (pcsr_register_content & 0x80000000) ? 16 : 8;
+ }
+ else
+ {
+ pcsr_register_content |=
+ ((device->bus_width == 16) ? 0x80000000 : 0x00000000);
+ target_write_u32 (target, MX3_PCSR, pcsr_register_content);
+ }
+
+ if (!device->page_size)
+ {
+ device->page_size =
+ (pcsr_register_content & 0x40000000) ? 2048 : 512;
+ }
+ else
+ {
+ pcsr_register_content |=
+ ((device->page_size == 2048) ? 0x40000000 : 0x00000000);
+ target_write_u32 (target, MX3_PCSR, pcsr_register_content);
+ }
+ if (mx3_nf_info->flags.one_kb_sram && (device->page_size == 2048))
+ {
+ LOG_ERROR
+ ("NAND controller have only 1 kb SRAM, so pagesize 2048 is incompatible with it");
+ }
+ }
+
+ {
+ uint32_t cgr_register_content;
+ target_read_u32 (target, MX3_CCM_CGR2, &cgr_register_content);
+ if (!(cgr_register_content & 0x00000300))
+ {
+ LOG_ERROR ("clock gating to EMI disabled");
+ return ERROR_FAIL;
+ }
+ }
+
+ {
+ uint32_t gpr_register_content;
+ target_read_u32 (target, MX3_GPR, &gpr_register_content);
+ if (gpr_register_content & 0x00000060)
+ {
+ LOG_ERROR ("pins mode overrided by GPR");
+ return ERROR_FAIL;
+ }
+ }
+
+ {
+ /*
+ * testing IOMUX settings; must be in "functional-mode output and
+ * functional-mode input" mode
+ */
+ uint8_t test_iomux;
+ test_iomux = ERROR_OK;
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0c0, 0x7f7f7f00, "d0,d1,d2");
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0c4, 0x7f7f7f7f, "d3,d4,d5,d6");
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0c8, 0x0000007f, "d7");
+ if (device->bus_width == 16)
+ {
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0c8, 0x7f7f7f00,
+ "d8,d9,d10");
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0cc, 0x7f7f7f7f,
+ "d11,d12,d13,d14");
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0d0, 0x0000007f, "d15");
+ }
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0d0, 0x7f7f7f00,
+ "nfwp,nfce,nfrb");
+ test_iomux |=
+ test_iomux_settings (target, 0x43fac0d4, 0x7f7f7f7f,
+ "nfwe,nfre,nfale,nfcle");
+ if (test_iomux != ERROR_OK)
+ {
+ return ERROR_FAIL;
+ }
+ }
+
+ initialize_nf_controller (device);
+
+ {
+ int retval;
+ uint16_t nand_status_content;
+ retval = ERROR_OK;
+ retval |= imx31_command (device, NAND_CMD_STATUS);
+ retval |= imx31_address (device, 0x00);
+ retval |= do_data_output (device);
+ if (retval != ERROR_OK)
+ {
+ LOG_ERROR (get_status_register_err_msg);
+ return ERROR_FAIL;
+ }
+ target_read_u16 (target, MX3_NF_MAIN_BUFFER0, &nand_status_content);
+ if (!(nand_status_content & 0x0080))
+ {
+ /*
+ * is host-big-endian correctly ??
+ */
+ LOG_INFO ("NAND read-only");
+ mx3_nf_info->flags.nand_readonly = 1;
+ }
+ else
+ {
+ mx3_nf_info->flags.nand_readonly = 0;
+ }
+ }
+ return ERROR_OK;
+}
+
+static int imx31_read_data (struct nand_device_s *device, void *data)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+ {
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ }
+
+ {
+ /*
+ * get data from nand chip
+ */
+ int try_data_output_from_nand_chip;
+ try_data_output_from_nand_chip = do_data_output (device);
+ if (try_data_output_from_nand_chip != ERROR_OK)
+ {
+ return try_data_output_from_nand_chip;
+ }
+ }
+
+ if (device->bus_width == 16)
+ {
+ get_next_halfword_from_sram_buffer (target, data);
+ }
+ else
+ {
+ get_next_byte_from_sram_buffer (target, data);
+ }
+
+ return ERROR_OK;
+}
+
+static int imx31_write_data (struct nand_device_s *device, uint16_t data)
+{
+ LOG_ERROR ("write_data() not implemented");
+ return ERROR_NAND_OPERATION_FAILED;
+}
+
+static int imx31_nand_ready (struct nand_device_s *device, int timeout)
+{
+ return imx31_controller_ready (device, timeout);
+}
+
+static int imx31_register_commands (struct command_context_s *cmd_ctx)
+{
+ return ERROR_OK;
+}
+
+static int imx31_reset (struct nand_device_s *device)
+{
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ initialize_nf_controller (device);
+ return ERROR_OK;
+}
+
+static int imx31_command (struct nand_device_s *device, uint8_t command)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+ {
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ }
+
+ switch (command)
+ {
+ case NAND_CMD_READOOB:
+ command = NAND_CMD_READ0;
+ in_sram_address = MX3_NF_SPARE_BUFFER0; /* set read point for
+ * data_read() and
+ * read_block_data() to
+ * spare area in SRAM
+ * buffer */
+ break;
+ case NAND_CMD_READ1:
+ command = NAND_CMD_READ0;
+ /*
+ * offset == one half of page size
+ */
+ in_sram_address =
+ MX3_NF_MAIN_BUFFER0 + (device->page_size >> 1);
+ default:
+ in_sram_address = MX3_NF_MAIN_BUFFER0;
+ }
+
+ target_write_u16 (target, MX3_NF_FCMD, command);
+ /*
+ * start command input operation (set MX3_NF_BIT_OP_DONE==0)
+ */
+ target_write_u16 (target, MX3_NF_CFG2, MX3_NF_BIT_OP_FCI);
+ {
+ int poll_result;
+ poll_result = poll_for_complete_op (target, "command");
+ if (poll_result != ERROR_OK)
+ {
+ return poll_result;
+ }
+ }
+ /*
+ * reset cursor to begin of the buffer
+ */
+ sign_of_sequental_byte_read = 0;
+ switch (command)
+ {
+ case NAND_CMD_READID:
+ mx3_nf_info->optype = MX3_NF_DATAOUT_NANDID;
+ mx3_nf_info->fin = MX3_NF_FIN_DATAOUT;
+ break;
+ case NAND_CMD_STATUS:
+ mx3_nf_info->optype = MX3_NF_DATAOUT_NANDSTATUS;
+ mx3_nf_info->fin = MX3_NF_FIN_DATAOUT;
+ break;
+ case NAND_CMD_READ0:
+ mx3_nf_info->fin = MX3_NF_FIN_DATAOUT;
+ mx3_nf_info->optype = MX3_NF_DATAOUT_PAGE;
+ break;
+ case NAND_CMD_SEQIN:
+ LOG_ERROR ("aaa");
+ return ERROR_FAIL;
+ break;
+ default:
+ mx3_nf_info->optype = MX3_NF_DATAOUT_PAGE;
+ }
+ return ERROR_OK;
+}
+
+static int imx31_address (struct nand_device_s *device, uint8_t address)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+ {
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ }
+
+ target_write_u16 (target, MX3_NF_FADDR, address);
+ /*
+ * start address input operation (set MX3_NF_BIT_OP_DONE==0)
+ */
+ target_write_u16 (target, MX3_NF_CFG2, MX3_NF_BIT_OP_FAI);
+ {
+ int poll_result;
+ poll_result = poll_for_complete_op (target, "address");
+ if (poll_result != ERROR_OK)
+ {
+ return poll_result;
+ }
+ }
+ return ERROR_OK;
+}
+
+static int imx31_controller_ready (struct nand_device_s *device, int tout)
+{
+ uint16_t poll_complete_status;
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+
+ {
+ /*
+ * validate target state
+ */
+ int validate_target_result;
+ validate_target_result = validate_target_state (device);
+ if (validate_target_result != ERROR_OK)
+ {
+ return validate_target_result;
+ }
+ }
+
+ do
+ {
+ target_read_u16 (target, MX3_NF_CFG2, &poll_complete_status);
+ if (poll_complete_status & MX3_NF_BIT_OP_DONE)
+ {
+ return tout;
+ }
+ alive_sleep (1);
+ }
+ while (tout-- > 0);
+ return tout;
+}
+
+static int imx31_write_page (struct nand_device_s *device, uint32_t page,
+ uint8_t * data, uint32_t data_size, uint8_t * oob,
+ uint32_t oob_size)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+
+ if (data_size % 2)
+ {
+ LOG_ERROR (data_block_size_err_msg, data_size);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ if (oob_size % 2)
+ {
+ LOG_ERROR (data_block_size_err_msg, oob_size);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ if (!data)
+ {
+ LOG_ERROR ("nothing to program");
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ {
+ /*
+ * validate target state
+ */
+ int retval;
+ retval = validate_target_state (device);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+ }
+ {
+ int retval = ERROR_OK;
+ retval |= imx31_command (device, NAND_CMD_SEQIN);
+ retval |= imx31_address (device, 0x00);
+ retval |= imx31_address (device, page & 0xff);
+ retval |= imx31_address (device, (page >> 8) & 0xff);
+ if (device->address_cycles >= 4)
+ {
+ retval |= imx31_address (device, (page >> 16) & 0xff);
+ if (device->address_cycles >= 5)
+ {
+ retval |= imx31_address (device, (page >> 24) & 0xff);
+ }
+ }
+ target_write_buffer (target, MX3_NF_MAIN_BUFFER0, data_size, data);
+ if (oob)
+ {
+ if (mx3_nf_info->flags.hw_ecc_enabled)
+ {
+ /*
+ * part of spare block will be overrided by hardware
+ * ECC generator
+ */
+ LOG_DEBUG
+ ("part of spare block will be overrided by hardware ECC generator");
+ }
+ target_write_buffer (target, MX3_NF_SPARE_BUFFER0, oob_size,
+ oob);
+ }
+ /*
+ * start data input operation (set MX3_NF_BIT_OP_DONE==0)
+ */
+ target_write_u16 (target, MX3_NF_CFG2, MX3_NF_BIT_OP_FDI);
+ {
+ int poll_result;
+ poll_result = poll_for_complete_op (target, "data input");
+ if (poll_result != ERROR_OK)
+ {
+ return poll_result;
+ }
+ }
+ retval |= imx31_command (device, NAND_CMD_PAGEPROG);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+
+ /*
+ * check status register
+ */
+ {
+ uint16_t nand_status_content;
+ retval = ERROR_OK;
+ retval |= imx31_command (device, NAND_CMD_STATUS);
+ retval |= imx31_address (device, 0x00);
+ retval |= do_data_output (device);
+ if (retval != ERROR_OK)
+ {
+ LOG_ERROR (get_status_register_err_msg);
+ return retval;
+ }
+ target_read_u16 (target, MX3_NF_MAIN_BUFFER0, &nand_status_content);
+ if (nand_status_content & 0x0001)
+ {
+ /*
+ * is host-big-endian correctly ??
+ */
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ }
+ }
+ return ERROR_OK;
+}
+
+static int imx31_read_page (struct nand_device_s *device, uint32_t page,
+ uint8_t * data, uint32_t data_size, uint8_t * oob,
+ uint32_t oob_size)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+
+ if (data_size % 2)
+ {
+ LOG_ERROR (data_block_size_err_msg, data_size);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ if (oob_size % 2)
+ {
+ LOG_ERROR (data_block_size_err_msg, oob_size);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+
+ {
+ /*
+ * validate target state
+ */
+ int retval;
+ retval = validate_target_state (device);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+ }
+ {
+ int retval = ERROR_OK;
+ retval |= imx31_command (device, NAND_CMD_READ0);
+ retval |= imx31_address (device, 0x00);
+ retval |= imx31_address (device, page & 0xff);
+ retval |= imx31_address (device, (page >> 8) & 0xff);
+ if (device->address_cycles >= 4)
+ {
+ retval |= imx31_address (device, (page >> 16) & 0xff);
+ if (device->address_cycles >= 5)
+ {
+ retval |= imx31_address (device, (page >> 24) & 0xff);
+ retval |= imx31_command (device, NAND_CMD_READSTART);
+ }
+ }
+ retval |= do_data_output (device);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+
+ if (data)
+ {
+ target_read_buffer (target, MX3_NF_MAIN_BUFFER0, data_size,
+ data);
+ }
+ if (oob)
+ {
+ target_read_buffer (target, MX3_NF_SPARE_BUFFER0, oob_size,
+ oob);
+ }
+ }
+ return ERROR_OK;
+}
+
+static int test_iomux_settings (target_t * target, uint32_t address,
+ uint32_t mask, const char *text)
+{
+ uint32_t register_content;
+ target_read_u32 (target, address, ®ister_content);
+ if ((register_content & mask) != (0x12121212 & mask))
+ {
+ LOG_ERROR ("IOMUX for {%s} is bad", text);
+ return ERROR_FAIL;
+ }
+ return ERROR_OK;
+}
+
+static int initialize_nf_controller (struct nand_device_s *device)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+ /*
+ * resets NAND flash controller in zero time ? I dont know.
+ */
+ target_write_u16 (target, MX3_NF_CFG1, MX3_NF_BIT_RESET_EN);
+ {
+ uint16_t work_mode;
+ work_mode = MX3_NF_BIT_INT_DIS; /* disable interrupt */
+ if (target->endianness == TARGET_BIG_ENDIAN)
+ {
+ work_mode |= MX3_NF_BIT_BE_EN;
+ }
+ if (mx3_nf_info->flags.hw_ecc_enabled)
+ {
+ work_mode |= MX3_NF_BIT_ECC_EN;
+ }
+ target_write_u16 (target, MX3_NF_CFG1, work_mode);
+ }
+ /*
+ * unlock SRAM buffer for write; 2 mean "Unlock", other values means "Lock"
+ */
+ target_write_u16 (target, MX3_NF_BUFCFG, 2);
+ {
+ uint16_t temp;
+ target_read_u16 (target, MX3_NF_FWP, &temp);
+ if ((temp & 0x0007) == 1)
+ {
+ LOG_ERROR ("NAND flash is tight-locked, reset needed");
+ return ERROR_FAIL;
+ }
+
+ }
+ /*
+ * unlock NAND flash for write
+ */
+ target_write_u16 (target, MX3_NF_FWP, 4);
+ target_write_u16 (target, MX3_NF_LOCKSTART, 0x0000);
+ target_write_u16 (target, MX3_NF_LOCKEND, 0xFFFF);
+ /*
+ * 0x0000 means that first SRAM buffer @0xB800_0000 will be used
+ */
+ target_write_u16 (target, MX3_NF_BUFADDR, 0x0000);
+ /*
+ * address of SRAM buffer
+ */
+ in_sram_address = MX3_NF_MAIN_BUFFER0;
+ sign_of_sequental_byte_read = 0;
+ return ERROR_OK;
+}
+
+static int get_next_byte_from_sram_buffer (target_t * target, uint8_t * value)
+{
+ static uint8_t even_byte = 0;
+ /*
+ * host-big_endian ??
+ */
+ if (sign_of_sequental_byte_read == 0)
+ {
+ even_byte = 0;
+ }
+ if (in_sram_address > MX3_NF_LAST_BUFFER_ADDR)
+ {
+ LOG_ERROR (sram_buffer_bounds_err_msg, in_sram_address);
+ *value = 0;
+ sign_of_sequental_byte_read = 0;
+ even_byte = 0;
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ else
+ {
+ uint16_t temp;
+ target_read_u16 (target, in_sram_address, &temp);
+ if (even_byte)
+ {
+ *value = temp >> 8;
+ even_byte = 0;
+ in_sram_address += 2;
+ }
+ else
+ {
+ *value = temp & 0xff;
+ even_byte = 1;
+ }
+ }
+ sign_of_sequental_byte_read = 1;
+ return ERROR_OK;
+}
+
+static int get_next_halfword_from_sram_buffer (target_t * target,
+ uint16_t * value)
+{
+ if (in_sram_address > MX3_NF_LAST_BUFFER_ADDR)
+ {
+ LOG_ERROR (sram_buffer_bounds_err_msg, in_sram_address);
+ *value = 0;
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ else
+ {
+ target_read_u16 (target, in_sram_address, value);
+ in_sram_address += 2;
+ }
+ return ERROR_OK;
+}
+
+static int poll_for_complete_op (target_t * target, const char *text)
+{
+ uint16_t poll_complete_status;
+ for (int poll_cycle_count = 0; poll_cycle_count < 100; poll_cycle_count++)
+ {
+ usleep (25);
+ target_read_u16 (target, MX3_NF_CFG2, &poll_complete_status);
+ if (poll_complete_status & MX3_NF_BIT_OP_DONE)
+ {
+ break;
+ }
+ }
+ if (!(poll_complete_status & MX3_NF_BIT_OP_DONE))
+ {
+ LOG_ERROR ("%s sending timeout", text);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ return ERROR_OK;
+}
+
+static int validate_target_state (struct nand_device_s *device)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_ERROR (target_not_halted_err_msg);
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+
+ if (mx3_nf_info->flags.target_little_endian !=
+ (target->endianness == TARGET_LITTLE_ENDIAN))
+ {
+ /*
+ * endianness changed after NAND controller probed
+ */
+ return ERROR_NAND_OPERATION_FAILED;
+ }
+ return ERROR_OK;
+}
+
+static int do_data_output (struct nand_device_s *device)
+{
+ mx3_nf_controller_t *mx3_nf_info = device->controller_priv;
+ target_t *target = mx3_nf_info->target;
+ switch (mx3_nf_info->fin)
+ {
+ case MX3_NF_FIN_DATAOUT:
+ /*
+ * start data output operation (set MX3_NF_BIT_OP_DONE==0)
+ */
+ target_write_u16 (target, MX3_NF_CFG2,
+ MX3_NF_BIT_DATAOUT_TYPE (mx3_nf_info->
+ optype));
+ {
+ int poll_result;
+ poll_result = poll_for_complete_op (target, "data output");
+ if (poll_result != ERROR_OK)
+ {
+ return poll_result;
+ }
+ }
+ mx3_nf_info->fin = MX3_NF_FIN_NONE;
+ /*
+ * ECC stuff
+ */
+ if ((mx3_nf_info->optype == MX3_NF_DATAOUT_PAGE)
+ && mx3_nf_info->flags.hw_ecc_enabled)
+ {
+ uint16_t ecc_status;
+ target_read_u16 (target, MX3_NF_ECCSTATUS, &ecc_status);
+ switch (ecc_status & 0x000c)
+ {
+ case 1 << 2:
+ LOG_DEBUG
+ ("main area readed with 1 (correctable) error");
+ break;
+ case 2 << 2:
+ LOG_DEBUG
+ ("main area readed with more than 1 (incorrectable) error");
+ return ERROR_NAND_OPERATION_FAILED;
+ break;
+ }
+ switch (ecc_status & 0x0003)
+ {
+ case 1:
+ LOG_DEBUG
+ ("spare area readed with 1 (correctable) error");
+ break;
+ case 2:
+ LOG_DEBUG
+ ("main area readed with more than 1 (incorrectable) error");
+ return ERROR_NAND_OPERATION_FAILED;
+ break;
+ }
+ }
+ break;
+ case MX3_NF_FIN_NONE:
+ break;
+ }
+ return ERROR_OK;
+}
projects / openocd / commitdiff