335 lines
8.6 KiB
C
335 lines
8.6 KiB
C
/****************************************************************************
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* boards/arm/sama5/sama5d2-xult/src/sam_sdmmc.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* The SAMA5D2-XULT provides a built-in 4GB eMMC (SDMMC0), and one SD
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* full-size memory card slot at J19 (SDMMC1).
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*
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* SDMMC0: There is a Micron 4Gx8 eMMC managed NAND Flash (MTFC4GLDEA-0M WT)
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* connected to SDMMC0.
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*
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* PA1 SDMMC0_CMD
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* PA2 SDMMC0_DAT0
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* PA3 SDMMC0_DAT1
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* PA4 SDMMC0_DAT2
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* PA5 SDMMC0_DAT3
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* PA6 SDMMC0_DAT4
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* PA7 SDMMC0_DAT5
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* PA8 SDMMC0_DAT6
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* PA9 SDMMC0_DAT7
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* PA0 SDMMC0_CK
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* PA10 SDMMC0_RSTN
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*
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* SDMMC1: The full size SD card slot connects via SDMMC1. The card detect
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* discrete is available on PA30 (pulled high). The write protect discrete
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* is tied to ground and not available to software. The slot only supports
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* 4-bit wide transfer mode.
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*
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* PA30 SDMMC1_CD
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* PA18 SDMMC1_DAT0
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* PA19 SDMMC1_DAT1
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* PA20 SDMMC1_DAT2
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* PA21 SDMMC1_DAT3
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* PD22 SDMMC1_CK
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* PA28 SDMMC1_CDA
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*
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/sdio.h>
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#include <nuttx/mmcsd.h>
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#include "chip.h"
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#include "arm_internal.h"
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#include "sam_pio.h"
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#include "sam_sdmmc.h"
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#include "sama5d2-xult.h"
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#ifdef HAVE_SDMMC
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure holds static information unique to one SDMMC peripheral */
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struct sam_sdmmc_state_s
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{
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struct sdio_dev_s *sdmmc; /* R/W device handle */
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pio_pinset_t pincfg; /* Card detect PIO pin configuration */
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uint8_t irq; /* Interrupt number (same as pid) */
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uint8_t slotno; /* Slot number */
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bool cd; /* TRUE: card is inserted */
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xcpt_t handler; /* Interrupt handler */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* SDMMC device state */
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#ifdef CONFIG_SAMA5_SDMMC0
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static int sam_sdmmc0_cardetect(int irq, void *regs, void *arg);
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static struct sam_sdmmc_state_s g_sdmmc0 =
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{
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.pincfg = PIO_SDMMC0_CD,
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.irq = -1,
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.slotno = 0,
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.handler = sam_sdmmc0_cardetect,
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};
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#endif
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#ifdef CONFIG_SAMA5_SDMMC1
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static int sam_sdmmc1_cardetect(int irq, void *regs, void *arg);
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static struct sam_sdmmc_state_s g_sdmmc1 =
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{
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.pincfg = PIO_SDMMC1_CD,
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.irq = IRQ_SDMMC1_CD,
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.slotno = 1,
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.handler = sam_sdmmc1_cardetect,
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_cardinserted_internal
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*
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* Description:
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* Check if a card is inserted into the selected SDMMC slot
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*
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****************************************************************************/
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bool sam_cardinserted_internal(struct sam_sdmmc_state_s *state)
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{
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bool inserted;
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/* Get the state of the PIO pin */
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inserted = sam_pioread(state->pincfg);
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finfo("Slot %d inserted: %s\n", state->slotno, inserted ? "NO" : "YES");
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return !inserted;
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}
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/****************************************************************************
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* Name: sam_sdmmc_cardetect, sam_sdmmc0_cardetect, and sam_sdmmc1_cardetect
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*
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* Description:
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* Card detect interrupt handlers
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*
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****************************************************************************/
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static int sam_sdmmc_cardetect(struct sam_sdmmc_state_s *state)
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{
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/* Get the current card insertion state */
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bool cd = sam_cardinserted_internal(state);
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/* Has the card detect state changed? */
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if (cd != state->cd)
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{
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/* Yes... remember that new state and inform the SDMMC driver */
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state->cd = cd;
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/* Report the new state to the SDIO driver */
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sdio_mediachange(state->sdmmc, cd);
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}
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return OK;
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}
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#ifdef CONFIG_SAMA5_SDMMC0
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static int sam_sdmmc0_cardetect(int irq, void *regs, void *arg)
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{
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return sam_sdmmc_cardetect(&g_sdmmc0);
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}
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#endif
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#ifdef CONFIG_SAMA5_SDMMC1
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static int sam_sdmmc1_cardetect(int irq, void *regs, void *arg)
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{
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return sam_sdmmc_cardetect(&g_sdmmc1);
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}
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#endif
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/****************************************************************************
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* Name: sam_sdmmc_state
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*
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* Description:
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* Initialize SDMMC PIOs.
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*
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****************************************************************************/
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static struct sam_sdmmc_state_s *sam_sdmmc_state(int slotno)
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{
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struct sam_sdmmc_state_s *state = NULL;
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#ifdef CONFIG_SAMA5_SDMMC0
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#ifdef CONFIG_SAMA5_SDMMC1
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if (slotno == 0)
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#endif
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{
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state = &g_sdmmc0;
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}
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#ifdef CONFIG_SAMA5_SDMMC1
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else
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#endif
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#endif
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#ifdef CONFIG_SAMA5_SDMMC1
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{
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state = &g_sdmmc1;
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}
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#endif
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return state;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_sdmmc_initialize
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*
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* Description:
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* Perform architecture specific initialization
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*
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****************************************************************************/
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int sam_sdmmc_initialize(int slotno, int minor)
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{
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struct sam_sdmmc_state_s *state;
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int ret;
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mcinfo("Entry.\n");
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mcinfo("slotno: %d\n", slotno);
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/* Get the static SDMMC description */
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state = sam_sdmmc_state(slotno);
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if (!state)
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{
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ferr("ERROR: No state for slotno %d\n", slotno);
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return -EINVAL;
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}
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/* Initialize card-detect and write-protect PIOs */
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sam_configpio(state->pincfg);
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/* Mount the SDIO-based MMC/SD block driver */
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/* First, get an instance of the SDIO interface */
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state->sdmmc = sam_sdmmc_sdio_initialize(slotno);
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if (!state->sdmmc)
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{
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ferr("ERROR: Failed to initialize SDIO slot %d\n", slotno);
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return -ENODEV;
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}
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/* Now bind the SDIO interface to the MMC/SD driver */
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ret = mmcsd_slotinitialize(minor, state->sdmmc);
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if (ret != OK)
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{
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ferr("ERROR: Failed to bind SDIO to the MMC/SD driver: %d\n", ret);
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return ret;
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}
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/* Configure card detect interrupts */
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sam_pioirq(state->pincfg);
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irq_attach(state->irq, state->handler, NULL);
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/* Then inform the SDMMC driver if there is or is not a card in the slot. */
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state->cd = sam_cardinserted_internal(state);
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sdio_mediachange(state->sdmmc, state->cd);
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/* Enable card detect interrupts */
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sam_pioirqenable(state->irq);
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return OK;
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}
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/****************************************************************************
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* Name: sam_cardinserted
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*
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* Description:
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* Check if a card is inserted into the selected SDMMC slot
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*
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****************************************************************************/
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bool sam_cardinserted(int slotno)
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{
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struct sam_sdmmc_state_s *state;
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/* Get the SDMMC description */
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state = sam_sdmmc_state(slotno);
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if (!state)
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{
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ferr("ERROR: No state for slotno %d\n", slotno);
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return false;
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}
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/* Return the state of the PIO pin */
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return sam_cardinserted_internal(state);
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}
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/****************************************************************************
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* Name: sam_writeprotected
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*
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* Description:
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* Check if a card is inserted into the selected SDMMC slot
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*
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****************************************************************************/
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bool sam_writeprotected(int slotno)
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{
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/* There are no write protect pins */
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return false;
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}
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#endif /* HAVE_SDMMC */
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