MXRT1050: Add support for Flash driver

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/flash_api.c

@@ -0,0 +1,344 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "flash_api.h"
+#include "mbed_toolchain.h"
+#include "mbed_critical.h"
+
+#if DEVICE_FLASH
+
+#include "fsl_flexspi.h"
+#include "fsl_cache.h"
+#include "flash_defines.h"
+
+AT_QUICKACCESS_SECTION_CODE(void flexspi_update_lut_ram(void));
+AT_QUICKACCESS_SECTION_CODE(status_t flexspi_nor_write_enable_ram(uint32_t baseAddr));
+AT_QUICKACCESS_SECTION_CODE(status_t flexspi_nor_wait_bus_busy_ram(void));
+AT_QUICKACCESS_SECTION_CODE(status_t flexspi_nor_flash_erase_sector_ram(uint32_t address));
+AT_QUICKACCESS_SECTION_CODE(static void flexspi_lower_clock_ram(void));
+AT_QUICKACCESS_SECTION_CODE(static void flexspi_clock_update_ram(void));
+AT_QUICKACCESS_SECTION_CODE(status_t flexspi_nor_flash_page_program_ram(uint32_t address,
+                                                                        const uint32_t *src,
+                                                                        uint32_t size));
+AT_QUICKACCESS_SECTION_CODE(void flexspi_nor_flash_read_data_ram(uint32_t addr,
+                                                                 uint32_t *buffer,
+                                                                 uint32_t size));
+
+void flexspi_update_lut_ram(void)
+{
+    flexspi_config_t config;
+
+    /*Get FLEXSPI default settings and configure the flexspi. */
+    FLEXSPI_GetDefaultConfig(&config);
+
+    /*Set AHB buffer size for reading data through AHB bus. */
+    config.ahbConfig.enableAHBPrefetch = true;
+    /*Allow AHB read start address do not follow the alignment requirement. */
+    config.ahbConfig.enableReadAddressOpt = true;
+    config.ahbConfig.enableAHBBufferable  = true;
+    config.ahbConfig.enableAHBCachable    = true;
+    /* enable diff clock and DQS */
+    config.enableSckBDiffOpt = true;
+    config.rxSampleClock     = kFLEXSPI_ReadSampleClkExternalInputFromDqsPad;
+    config.enableCombination = true;
+    FLEXSPI_Init(FLEXSPI, &config);
+
+    /* Configure flash settings according to serial flash feature. */
+    FLEXSPI_SetFlashConfig(FLEXSPI, &deviceconfig, kFLEXSPI_PortA1);
+
+    /* Update LUT table. */
+    FLEXSPI_UpdateLUT(FLEXSPI, 0, customLUT, CUSTOM_LUT_LENGTH);
+
+    FLEXSPI_SoftwareReset(FLEXSPI);
+
+    /* Wait for bus idle. */
+    while (!FLEXSPI_GetBusIdleStatus(FLEXSPI)) {
+    }
+}
+
+status_t flexspi_nor_write_enable_ram(uint32_t baseAddr)
+{
+    flexspi_transfer_t flashXfer;
+    status_t status;
+
+    /* Write enable */
+    flashXfer.deviceAddress = baseAddr;
+    flashXfer.port          = kFLEXSPI_PortA1;
+    flashXfer.cmdType       = kFLEXSPI_Command;
+    flashXfer.SeqNumber     = 2;
+    flashXfer.seqIndex      = HYPERFLASH_CMD_LUT_SEQ_IDX_WRITEENABLE;
+
+    status = FLEXSPI_TransferBlocking(FLEXSPI, &flashXfer);
+
+    return status;
+}
+
+status_t flexspi_nor_wait_bus_busy_ram(void)
+{
+    /* Wait status ready. */
+    bool isBusy;
+    uint32_t readValue;
+    status_t status;
+    flexspi_transfer_t flashXfer;
+
+    flashXfer.deviceAddress = 0;
+    flashXfer.port          = kFLEXSPI_PortA1;
+    flashXfer.cmdType       = kFLEXSPI_Read;
+    flashXfer.SeqNumber     = 2;
+    flashXfer.seqIndex      = HYPERFLASH_CMD_LUT_SEQ_IDX_READSTATUS;
+    flashXfer.data          = &readValue;
+    flashXfer.dataSize      = 2;
+
+    do {
+        status = FLEXSPI_TransferBlocking(FLEXSPI, &flashXfer);
+
+        if (status != kStatus_Success) {
+            return status;
+        }
+
+        if (readValue & 0x8000) {
+            isBusy = false;
+        } else {
+            isBusy = true;
+        }
+
+        if (readValue & 0x3200) {
+            status = kStatus_Fail;
+            break;
+        }
+
+    } while (isBusy);
+
+    return status;
+
+}
+
+status_t flexspi_nor_flash_erase_sector_ram(uint32_t address)
+{
+    status_t status;
+    flexspi_transfer_t flashXfer;
+
+    /* Write enable */
+    status = flexspi_nor_write_enable_ram(address);
+    if (status != kStatus_Success) {
+        return status;
+    }
+
+    flashXfer.deviceAddress = address;
+    flashXfer.port          = kFLEXSPI_PortA1;
+    flashXfer.cmdType       = kFLEXSPI_Command;
+    flashXfer.SeqNumber     = 4;
+    flashXfer.seqIndex      = HYPERFLASH_CMD_LUT_SEQ_IDX_ERASESECTOR;
+
+    status = FLEXSPI_TransferBlocking(FLEXSPI, &flashXfer);
+    if (status != kStatus_Success) {
+        return status;
+    }
+
+    status = flexspi_nor_wait_bus_busy_ram();
+
+    /* Do software reset. */
+    FLEXSPI_SoftwareReset(FLEXSPI);
+
+    return status;
+}
+
+static void flexspi_lower_clock_ram(void)
+{
+    unsigned int reg;
+
+    FLEXSPI_Enable(FLEXSPI, false);
+
+    /* Disable FlexSPI clock */
+    CCM->CCGR6 &= ~CCM_CCGR6_CG5_MASK;
+
+    /* flexspi clock 66M, DDR mode, internal clock 33M. */
+    reg = CCM->CSCMR1;
+    reg &= ~CCM_CSCMR1_FLEXSPI_PODF_MASK;
+    reg |= CCM_CSCMR1_FLEXSPI_PODF(3);
+    CCM->CSCMR1 = reg;
+
+    /* Enable FlexSPI clock */
+    CCM->CCGR6 |= CCM_CCGR6_CG5_MASK;
+
+    FLEXSPI_Enable(FLEXSPI, true);
+    /* Do software reset. */
+    FLEXSPI_SoftwareReset(FLEXSPI);
+    /* Wait for bus idle. */
+    while (!FLEXSPI_GetBusIdleStatus(FLEXSPI)) {
+    }
+}
+
+static void flexspi_clock_update_ram(void)
+{
+    /* Program finished, speed the clock to 133M. */
+    /* Wait for bus idle before change flash configuration. */
+    while (!FLEXSPI_GetBusIdleStatus(FLEXSPI)) {
+    }
+    FLEXSPI_Enable(FLEXSPI, false);
+    /* Disable FlexSPI clock */
+    CCM->CCGR6 &= ~CCM_CCGR6_CG5_MASK;
+
+    /* flexspi clock 260M, DDR mode, internal clock 130M. */
+    CCM->CSCMR1 &= ~CCM_CSCMR1_FLEXSPI_PODF_MASK;
+
+    /* Enable FlexSPI clock */
+    CCM->CCGR6 |= CCM_CCGR6_CG5_MASK;
+
+    FLEXSPI_Enable(FLEXSPI, true);
+}
+
+status_t flexspi_nor_flash_page_program_ram(uint32_t address, const uint32_t *src, uint32_t size)
+{
+    status_t status;
+    flexspi_transfer_t flashXfer;
+
+    flexspi_lower_clock_ram();
+
+    /* Write enable */
+    status = flexspi_nor_write_enable_ram(address);
+
+    if (status != kStatus_Success) {
+        return status;
+    }
+
+    /* Prepare page program command */
+    flashXfer.deviceAddress = address;
+    flashXfer.port          = kFLEXSPI_PortA1;
+    flashXfer.cmdType       = kFLEXSPI_Write;
+    flashXfer.SeqNumber     = 2;
+    flashXfer.seqIndex      = HYPERFLASH_CMD_LUT_SEQ_IDX_PAGEPROGRAM;
+    flashXfer.data          = (uint32_t *)src;
+    flashXfer.dataSize      = size;
+
+    status = FLEXSPI_TransferBlocking(FLEXSPI, &flashXfer);
+
+    if (status != kStatus_Success) {
+        return status;
+    }
+
+    status = flexspi_nor_wait_bus_busy_ram();
+
+    flexspi_clock_update_ram();
+
+    /* Do software reset. */
+    FLEXSPI_SoftwareReset(FLEXSPI);
+
+    return status;
+}
+
+void flexspi_nor_flash_read_data_ram(uint32_t addr, uint32_t *buffer, uint32_t size)
+{
+    memcpy(buffer, (void *)addr, size);
+}
+
+int32_t flash_init(flash_t *obj)
+{
+    flexspi_update_lut_ram();
+
+    return 0;
+}
+
+int32_t flash_erase_sector(flash_t *obj, uint32_t address)
+{
+    status_t status;
+    int32_t ret = 0;
+
+    core_util_critical_section_enter();
+
+    status = flexspi_nor_flash_erase_sector_ram(address - FlexSPI_AMBA_BASE);
+
+    if (status != kStatus_Success) {
+        ret = -1;
+    } else {
+        DCACHE_InvalidateByRange(address, BOARD_FLASH_SECTOR_SIZE);
+    }
+
+    core_util_critical_section_exit();
+
+    return ret;
+}
+
+int32_t flash_program_page(flash_t *obj, uint32_t address, const uint8_t *data, uint32_t size)
+{
+    status_t status;
+    int32_t ret = 0;
+
+    core_util_critical_section_enter();
+
+    status = flexspi_nor_flash_page_program_ram(address - FlexSPI_AMBA_BASE, (uint32_t *)data, size);
+
+    if (status != kStatus_Success) {
+        ret = -1;
+    } else {
+        DCACHE_InvalidateByRange(address, size);
+    }
+
+    core_util_critical_section_exit();
+
+    return ret;
+}
+
+int32_t flash_read(flash_t *obj, uint32_t address, uint8_t *data, uint32_t size)
+{
+    flexspi_nor_flash_read_data_ram(address, (uint32_t *)data, size);
+
+    return 0;
+}
+
+int32_t flash_free(flash_t *obj)
+{
+    return 0;
+}
+
+uint32_t flash_get_sector_size(const flash_t *obj, uint32_t address)
+{
+    uint32_t sectorsize = MBED_FLASH_INVALID_SIZE;
+    uint32_t devicesize = BOARD_FLASH_SIZE;
+    uint32_t startaddr = BOARD_FLASH_START_ADDR;
+
+    if ((address >= startaddr) && (address < (startaddr + devicesize))) {
+        sectorsize = BOARD_FLASH_SECTOR_SIZE;
+    }
+
+    return sectorsize;
+}
+
+uint32_t flash_get_page_size(const flash_t *obj)
+{
+    return BOARD_FLASH_PAGE_SIZE;
+}
+
+uint32_t flash_get_start_address(const flash_t *obj)
+{
+    return BOARD_FLASH_START_ADDR;
+}
+
+uint32_t flash_get_size(const flash_t *obj)
+{
+    return BOARD_FLASH_SIZE;
+}
+
+uint8_t flash_get_erase_value(const flash_t *obj)
+{
+    (void)obj;
+
+    return 0xFF;
+}
+
+#endif //DEVICE_FLASH
+

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/objects.h

@@ -66,6 +66,12 @@ struct trng_s {
     uint8_t dummy;
 };
 
+#if DEVICE_FLASH
+struct flash_s {
+    uint8_t dummy;
+};
+#endif
+
 #include "gpio_object.h"
 
 #ifdef __cplusplus

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/device.h

@@ -19,7 +19,13 @@
 #define MBED_DEVICE_H
 
 #define DEVICE_ID_LENGTH       24
-#define BOARD_FLASH_SIZE       (0x4000000U)
+/* 4MB reserved for mbed-os */
+#define BOARD_FLASH_SIZE             (0x3C00000U)
+#define BOARD_FLASH_START_ADDR       (0x60400000U)
+
+#define BOARD_FLASH_PAGE_SIZE        (512)
+#define BOARD_FLASH_SECTOR_SIZE      (262144)
+
 #define BOARD_ENET_PHY_ADDR    (2)
 
 #include "objects.h"