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![Sachin Kamat](/assets/img/avatar_default.png)
regulator_enable() is declared with __must_check attribute. Hence check the return value to ensure that the regulator is enabled. Fixes the following warning: drivers/mmc/host/dw_mmc.c:2461:19: warning: ignoring return value of ‘regulator_enable’, declared with attribute warn_unused_result [-Wunused-result] drivers/mmc/host/dw_mmc.c: In function ‘dw_mci_init_slot’: drivers/mmc/host/dw_mmc.c:1994:19: warning: ignoring return value of ‘regulator_enable’, declared with attribute warn_unused_result [-Wunused-result] Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2533 lines
62 KiB
C
2533 lines
62 KiB
C
/*
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* Synopsys DesignWare Multimedia Card Interface driver
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* (Based on NXP driver for lpc 31xx)
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*
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* Copyright (C) 2009 NXP Semiconductors
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* Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/blkdev.h>
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/dw_mmc.h>
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#include <linux/bitops.h>
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#include <linux/regulator/consumer.h>
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#include <linux/workqueue.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include "dw_mmc.h"
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/* Common flag combinations */
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#define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
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SDMMC_INT_HTO | SDMMC_INT_SBE | \
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SDMMC_INT_EBE)
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#define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
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SDMMC_INT_RESP_ERR)
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#define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
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DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
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#define DW_MCI_SEND_STATUS 1
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#define DW_MCI_RECV_STATUS 2
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#define DW_MCI_DMA_THRESHOLD 16
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#ifdef CONFIG_MMC_DW_IDMAC
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struct idmac_desc {
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u32 des0; /* Control Descriptor */
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#define IDMAC_DES0_DIC BIT(1)
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#define IDMAC_DES0_LD BIT(2)
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#define IDMAC_DES0_FD BIT(3)
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#define IDMAC_DES0_CH BIT(4)
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#define IDMAC_DES0_ER BIT(5)
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#define IDMAC_DES0_CES BIT(30)
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#define IDMAC_DES0_OWN BIT(31)
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u32 des1; /* Buffer sizes */
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#define IDMAC_SET_BUFFER1_SIZE(d, s) \
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((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
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u32 des2; /* buffer 1 physical address */
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u32 des3; /* buffer 2 physical address */
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};
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#endif /* CONFIG_MMC_DW_IDMAC */
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/**
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* struct dw_mci_slot - MMC slot state
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* @mmc: The mmc_host representing this slot.
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* @host: The MMC controller this slot is using.
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* @quirks: Slot-level quirks (DW_MCI_SLOT_QUIRK_XXX)
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* @wp_gpio: If gpio_is_valid() we'll use this to read write protect.
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* @ctype: Card type for this slot.
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* @mrq: mmc_request currently being processed or waiting to be
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* processed, or NULL when the slot is idle.
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* @queue_node: List node for placing this node in the @queue list of
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* &struct dw_mci.
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* @clock: Clock rate configured by set_ios(). Protected by host->lock.
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* @flags: Random state bits associated with the slot.
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* @id: Number of this slot.
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* @last_detect_state: Most recently observed card detect state.
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*/
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struct dw_mci_slot {
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struct mmc_host *mmc;
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struct dw_mci *host;
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int quirks;
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int wp_gpio;
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u32 ctype;
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struct mmc_request *mrq;
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struct list_head queue_node;
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unsigned int clock;
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unsigned long flags;
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#define DW_MMC_CARD_PRESENT 0
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#define DW_MMC_CARD_NEED_INIT 1
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int id;
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int last_detect_state;
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};
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#if defined(CONFIG_DEBUG_FS)
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static int dw_mci_req_show(struct seq_file *s, void *v)
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{
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struct dw_mci_slot *slot = s->private;
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struct mmc_request *mrq;
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struct mmc_command *cmd;
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struct mmc_command *stop;
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struct mmc_data *data;
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/* Make sure we get a consistent snapshot */
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spin_lock_bh(&slot->host->lock);
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mrq = slot->mrq;
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if (mrq) {
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cmd = mrq->cmd;
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data = mrq->data;
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stop = mrq->stop;
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if (cmd)
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seq_printf(s,
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"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
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cmd->opcode, cmd->arg, cmd->flags,
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cmd->resp[0], cmd->resp[1], cmd->resp[2],
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cmd->resp[2], cmd->error);
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if (data)
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seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
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data->bytes_xfered, data->blocks,
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data->blksz, data->flags, data->error);
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if (stop)
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seq_printf(s,
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"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
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stop->opcode, stop->arg, stop->flags,
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stop->resp[0], stop->resp[1], stop->resp[2],
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stop->resp[2], stop->error);
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}
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spin_unlock_bh(&slot->host->lock);
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return 0;
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}
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static int dw_mci_req_open(struct inode *inode, struct file *file)
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{
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return single_open(file, dw_mci_req_show, inode->i_private);
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}
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static const struct file_operations dw_mci_req_fops = {
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.owner = THIS_MODULE,
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.open = dw_mci_req_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int dw_mci_regs_show(struct seq_file *s, void *v)
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{
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seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
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seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
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seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
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seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
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seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
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seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
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return 0;
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}
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static int dw_mci_regs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, dw_mci_regs_show, inode->i_private);
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}
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static const struct file_operations dw_mci_regs_fops = {
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.owner = THIS_MODULE,
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.open = dw_mci_regs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
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{
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struct mmc_host *mmc = slot->mmc;
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struct dw_mci *host = slot->host;
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struct dentry *root;
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struct dentry *node;
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root = mmc->debugfs_root;
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if (!root)
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return;
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node = debugfs_create_file("regs", S_IRUSR, root, host,
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&dw_mci_regs_fops);
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if (!node)
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goto err;
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node = debugfs_create_file("req", S_IRUSR, root, slot,
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&dw_mci_req_fops);
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if (!node)
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goto err;
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node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
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if (!node)
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goto err;
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node = debugfs_create_x32("pending_events", S_IRUSR, root,
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(u32 *)&host->pending_events);
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if (!node)
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goto err;
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node = debugfs_create_x32("completed_events", S_IRUSR, root,
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(u32 *)&host->completed_events);
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if (!node)
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goto err;
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return;
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err:
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dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
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}
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#endif /* defined(CONFIG_DEBUG_FS) */
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static void dw_mci_set_timeout(struct dw_mci *host)
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{
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/* timeout (maximum) */
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mci_writel(host, TMOUT, 0xffffffff);
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}
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static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
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{
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struct mmc_data *data;
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struct dw_mci_slot *slot = mmc_priv(mmc);
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const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
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u32 cmdr;
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cmd->error = -EINPROGRESS;
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cmdr = cmd->opcode;
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if (cmdr == MMC_STOP_TRANSMISSION)
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cmdr |= SDMMC_CMD_STOP;
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else
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cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
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if (cmd->flags & MMC_RSP_PRESENT) {
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/* We expect a response, so set this bit */
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cmdr |= SDMMC_CMD_RESP_EXP;
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if (cmd->flags & MMC_RSP_136)
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cmdr |= SDMMC_CMD_RESP_LONG;
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}
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if (cmd->flags & MMC_RSP_CRC)
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cmdr |= SDMMC_CMD_RESP_CRC;
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data = cmd->data;
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if (data) {
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cmdr |= SDMMC_CMD_DAT_EXP;
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if (data->flags & MMC_DATA_STREAM)
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cmdr |= SDMMC_CMD_STRM_MODE;
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if (data->flags & MMC_DATA_WRITE)
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cmdr |= SDMMC_CMD_DAT_WR;
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}
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if (drv_data && drv_data->prepare_command)
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drv_data->prepare_command(slot->host, &cmdr);
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return cmdr;
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}
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static void dw_mci_start_command(struct dw_mci *host,
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struct mmc_command *cmd, u32 cmd_flags)
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{
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host->cmd = cmd;
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dev_vdbg(host->dev,
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"start command: ARGR=0x%08x CMDR=0x%08x\n",
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cmd->arg, cmd_flags);
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mci_writel(host, CMDARG, cmd->arg);
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wmb();
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mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
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}
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static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
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{
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dw_mci_start_command(host, data->stop, host->stop_cmdr);
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}
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/* DMA interface functions */
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static void dw_mci_stop_dma(struct dw_mci *host)
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{
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if (host->using_dma) {
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host->dma_ops->stop(host);
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host->dma_ops->cleanup(host);
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} else {
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/* Data transfer was stopped by the interrupt handler */
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set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
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}
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}
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static int dw_mci_get_dma_dir(struct mmc_data *data)
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{
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if (data->flags & MMC_DATA_WRITE)
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return DMA_TO_DEVICE;
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else
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return DMA_FROM_DEVICE;
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}
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#ifdef CONFIG_MMC_DW_IDMAC
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static void dw_mci_dma_cleanup(struct dw_mci *host)
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{
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struct mmc_data *data = host->data;
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if (data)
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if (!data->host_cookie)
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dma_unmap_sg(host->dev,
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data->sg,
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data->sg_len,
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dw_mci_get_dma_dir(data));
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}
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static void dw_mci_idmac_stop_dma(struct dw_mci *host)
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{
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u32 temp;
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/* Disable and reset the IDMAC interface */
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temp = mci_readl(host, CTRL);
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temp &= ~SDMMC_CTRL_USE_IDMAC;
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temp |= SDMMC_CTRL_DMA_RESET;
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mci_writel(host, CTRL, temp);
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/* Stop the IDMAC running */
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temp = mci_readl(host, BMOD);
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temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
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mci_writel(host, BMOD, temp);
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}
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static void dw_mci_idmac_complete_dma(struct dw_mci *host)
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{
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struct mmc_data *data = host->data;
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dev_vdbg(host->dev, "DMA complete\n");
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host->dma_ops->cleanup(host);
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/*
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* If the card was removed, data will be NULL. No point in trying to
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* send the stop command or waiting for NBUSY in this case.
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*/
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if (data) {
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set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
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tasklet_schedule(&host->tasklet);
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}
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}
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static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
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unsigned int sg_len)
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{
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int i;
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struct idmac_desc *desc = host->sg_cpu;
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for (i = 0; i < sg_len; i++, desc++) {
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unsigned int length = sg_dma_len(&data->sg[i]);
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u32 mem_addr = sg_dma_address(&data->sg[i]);
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/* Set the OWN bit and disable interrupts for this descriptor */
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desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
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/* Buffer length */
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IDMAC_SET_BUFFER1_SIZE(desc, length);
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/* Physical address to DMA to/from */
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desc->des2 = mem_addr;
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}
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/* Set first descriptor */
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desc = host->sg_cpu;
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desc->des0 |= IDMAC_DES0_FD;
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/* Set last descriptor */
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desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
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desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
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desc->des0 |= IDMAC_DES0_LD;
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wmb();
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}
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static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
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{
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u32 temp;
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dw_mci_translate_sglist(host, host->data, sg_len);
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|
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/* Select IDMAC interface */
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temp = mci_readl(host, CTRL);
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temp |= SDMMC_CTRL_USE_IDMAC;
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mci_writel(host, CTRL, temp);
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wmb();
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|
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/* Enable the IDMAC */
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temp = mci_readl(host, BMOD);
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temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
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mci_writel(host, BMOD, temp);
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|
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/* Start it running */
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mci_writel(host, PLDMND, 1);
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}
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|
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static int dw_mci_idmac_init(struct dw_mci *host)
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{
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struct idmac_desc *p;
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int i;
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|
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/* Number of descriptors in the ring buffer */
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host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
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|
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/* Forward link the descriptor list */
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for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
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p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
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|
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/* Set the last descriptor as the end-of-ring descriptor */
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p->des3 = host->sg_dma;
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p->des0 = IDMAC_DES0_ER;
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|
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mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
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|
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/* Mask out interrupts - get Tx & Rx complete only */
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mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
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SDMMC_IDMAC_INT_TI);
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|
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/* Set the descriptor base address */
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mci_writel(host, DBADDR, host->sg_dma);
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return 0;
|
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}
|
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|
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static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
|
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.init = dw_mci_idmac_init,
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.start = dw_mci_idmac_start_dma,
|
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.stop = dw_mci_idmac_stop_dma,
|
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.complete = dw_mci_idmac_complete_dma,
|
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.cleanup = dw_mci_dma_cleanup,
|
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};
|
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#endif /* CONFIG_MMC_DW_IDMAC */
|
|
|
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static int dw_mci_pre_dma_transfer(struct dw_mci *host,
|
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struct mmc_data *data,
|
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bool next)
|
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{
|
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struct scatterlist *sg;
|
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unsigned int i, sg_len;
|
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|
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if (!next && data->host_cookie)
|
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return data->host_cookie;
|
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|
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/*
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* We don't do DMA on "complex" transfers, i.e. with
|
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* non-word-aligned buffers or lengths. Also, we don't bother
|
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* with all the DMA setup overhead for short transfers.
|
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*/
|
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if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
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return -EINVAL;
|
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|
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if (data->blksz & 3)
|
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return -EINVAL;
|
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|
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for_each_sg(data->sg, sg, data->sg_len, i) {
|
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if (sg->offset & 3 || sg->length & 3)
|
|
return -EINVAL;
|
|
}
|
|
|
|
sg_len = dma_map_sg(host->dev,
|
|
data->sg,
|
|
data->sg_len,
|
|
dw_mci_get_dma_dir(data));
|
|
if (sg_len == 0)
|
|
return -EINVAL;
|
|
|
|
if (next)
|
|
data->host_cookie = sg_len;
|
|
|
|
return sg_len;
|
|
}
|
|
|
|
static void dw_mci_pre_req(struct mmc_host *mmc,
|
|
struct mmc_request *mrq,
|
|
bool is_first_req)
|
|
{
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!slot->host->use_dma || !data)
|
|
return;
|
|
|
|
if (data->host_cookie) {
|
|
data->host_cookie = 0;
|
|
return;
|
|
}
|
|
|
|
if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
|
|
data->host_cookie = 0;
|
|
}
|
|
|
|
static void dw_mci_post_req(struct mmc_host *mmc,
|
|
struct mmc_request *mrq,
|
|
int err)
|
|
{
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!slot->host->use_dma || !data)
|
|
return;
|
|
|
|
if (data->host_cookie)
|
|
dma_unmap_sg(slot->host->dev,
|
|
data->sg,
|
|
data->sg_len,
|
|
dw_mci_get_dma_dir(data));
|
|
data->host_cookie = 0;
|
|
}
|
|
|
|
static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
|
|
{
|
|
int sg_len;
|
|
u32 temp;
|
|
|
|
host->using_dma = 0;
|
|
|
|
/* If we don't have a channel, we can't do DMA */
|
|
if (!host->use_dma)
|
|
return -ENODEV;
|
|
|
|
sg_len = dw_mci_pre_dma_transfer(host, data, 0);
|
|
if (sg_len < 0) {
|
|
host->dma_ops->stop(host);
|
|
return sg_len;
|
|
}
|
|
|
|
host->using_dma = 1;
|
|
|
|
dev_vdbg(host->dev,
|
|
"sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
|
|
(unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
|
|
sg_len);
|
|
|
|
/* Enable the DMA interface */
|
|
temp = mci_readl(host, CTRL);
|
|
temp |= SDMMC_CTRL_DMA_ENABLE;
|
|
mci_writel(host, CTRL, temp);
|
|
|
|
/* Disable RX/TX IRQs, let DMA handle it */
|
|
temp = mci_readl(host, INTMASK);
|
|
temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
|
|
mci_writel(host, INTMASK, temp);
|
|
|
|
host->dma_ops->start(host, sg_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
|
|
{
|
|
u32 temp;
|
|
|
|
data->error = -EINPROGRESS;
|
|
|
|
WARN_ON(host->data);
|
|
host->sg = NULL;
|
|
host->data = data;
|
|
|
|
if (data->flags & MMC_DATA_READ)
|
|
host->dir_status = DW_MCI_RECV_STATUS;
|
|
else
|
|
host->dir_status = DW_MCI_SEND_STATUS;
|
|
|
|
if (dw_mci_submit_data_dma(host, data)) {
|
|
int flags = SG_MITER_ATOMIC;
|
|
if (host->data->flags & MMC_DATA_READ)
|
|
flags |= SG_MITER_TO_SG;
|
|
else
|
|
flags |= SG_MITER_FROM_SG;
|
|
|
|
sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
|
|
host->sg = data->sg;
|
|
host->part_buf_start = 0;
|
|
host->part_buf_count = 0;
|
|
|
|
mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
|
|
temp = mci_readl(host, INTMASK);
|
|
temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
|
|
mci_writel(host, INTMASK, temp);
|
|
|
|
temp = mci_readl(host, CTRL);
|
|
temp &= ~SDMMC_CTRL_DMA_ENABLE;
|
|
mci_writel(host, CTRL, temp);
|
|
}
|
|
}
|
|
|
|
static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
|
|
{
|
|
struct dw_mci *host = slot->host;
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(500);
|
|
unsigned int cmd_status = 0;
|
|
|
|
mci_writel(host, CMDARG, arg);
|
|
wmb();
|
|
mci_writel(host, CMD, SDMMC_CMD_START | cmd);
|
|
|
|
while (time_before(jiffies, timeout)) {
|
|
cmd_status = mci_readl(host, CMD);
|
|
if (!(cmd_status & SDMMC_CMD_START))
|
|
return;
|
|
}
|
|
dev_err(&slot->mmc->class_dev,
|
|
"Timeout sending command (cmd %#x arg %#x status %#x)\n",
|
|
cmd, arg, cmd_status);
|
|
}
|
|
|
|
static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
|
|
{
|
|
struct dw_mci *host = slot->host;
|
|
u32 div;
|
|
u32 clk_en_a;
|
|
|
|
if (slot->clock != host->current_speed || force_clkinit) {
|
|
div = host->bus_hz / slot->clock;
|
|
if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
|
|
/*
|
|
* move the + 1 after the divide to prevent
|
|
* over-clocking the card.
|
|
*/
|
|
div += 1;
|
|
|
|
div = (host->bus_hz != slot->clock) ? DIV_ROUND_UP(div, 2) : 0;
|
|
|
|
dev_info(&slot->mmc->class_dev,
|
|
"Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
|
|
" div = %d)\n", slot->id, host->bus_hz, slot->clock,
|
|
div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
|
|
|
|
/* disable clock */
|
|
mci_writel(host, CLKENA, 0);
|
|
mci_writel(host, CLKSRC, 0);
|
|
|
|
/* inform CIU */
|
|
mci_send_cmd(slot,
|
|
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
|
|
|
|
/* set clock to desired speed */
|
|
mci_writel(host, CLKDIV, div);
|
|
|
|
/* inform CIU */
|
|
mci_send_cmd(slot,
|
|
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
|
|
|
|
/* enable clock; only low power if no SDIO */
|
|
clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
|
|
if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
|
|
clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
|
|
mci_writel(host, CLKENA, clk_en_a);
|
|
|
|
/* inform CIU */
|
|
mci_send_cmd(slot,
|
|
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
|
|
|
|
host->current_speed = slot->clock;
|
|
}
|
|
|
|
/* Set the current slot bus width */
|
|
mci_writel(host, CTYPE, (slot->ctype << slot->id));
|
|
}
|
|
|
|
static void __dw_mci_start_request(struct dw_mci *host,
|
|
struct dw_mci_slot *slot,
|
|
struct mmc_command *cmd)
|
|
{
|
|
struct mmc_request *mrq;
|
|
struct mmc_data *data;
|
|
u32 cmdflags;
|
|
|
|
mrq = slot->mrq;
|
|
if (host->pdata->select_slot)
|
|
host->pdata->select_slot(slot->id);
|
|
|
|
host->cur_slot = slot;
|
|
host->mrq = mrq;
|
|
|
|
host->pending_events = 0;
|
|
host->completed_events = 0;
|
|
host->data_status = 0;
|
|
|
|
data = cmd->data;
|
|
if (data) {
|
|
dw_mci_set_timeout(host);
|
|
mci_writel(host, BYTCNT, data->blksz*data->blocks);
|
|
mci_writel(host, BLKSIZ, data->blksz);
|
|
}
|
|
|
|
cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
|
|
|
|
/* this is the first command, send the initialization clock */
|
|
if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
|
|
cmdflags |= SDMMC_CMD_INIT;
|
|
|
|
if (data) {
|
|
dw_mci_submit_data(host, data);
|
|
wmb();
|
|
}
|
|
|
|
dw_mci_start_command(host, cmd, cmdflags);
|
|
|
|
if (mrq->stop)
|
|
host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
|
|
}
|
|
|
|
static void dw_mci_start_request(struct dw_mci *host,
|
|
struct dw_mci_slot *slot)
|
|
{
|
|
struct mmc_request *mrq = slot->mrq;
|
|
struct mmc_command *cmd;
|
|
|
|
cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
|
|
__dw_mci_start_request(host, slot, cmd);
|
|
}
|
|
|
|
/* must be called with host->lock held */
|
|
static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
|
|
struct mmc_request *mrq)
|
|
{
|
|
dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
|
|
host->state);
|
|
|
|
slot->mrq = mrq;
|
|
|
|
if (host->state == STATE_IDLE) {
|
|
host->state = STATE_SENDING_CMD;
|
|
dw_mci_start_request(host, slot);
|
|
} else {
|
|
list_add_tail(&slot->queue_node, &host->queue);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct dw_mci *host = slot->host;
|
|
|
|
WARN_ON(slot->mrq);
|
|
|
|
/*
|
|
* The check for card presence and queueing of the request must be
|
|
* atomic, otherwise the card could be removed in between and the
|
|
* request wouldn't fail until another card was inserted.
|
|
*/
|
|
spin_lock_bh(&host->lock);
|
|
|
|
if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
|
|
spin_unlock_bh(&host->lock);
|
|
mrq->cmd->error = -ENOMEDIUM;
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
|
|
dw_mci_queue_request(host, slot, mrq);
|
|
|
|
spin_unlock_bh(&host->lock);
|
|
}
|
|
|
|
static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
|
|
u32 regs;
|
|
|
|
switch (ios->bus_width) {
|
|
case MMC_BUS_WIDTH_4:
|
|
slot->ctype = SDMMC_CTYPE_4BIT;
|
|
break;
|
|
case MMC_BUS_WIDTH_8:
|
|
slot->ctype = SDMMC_CTYPE_8BIT;
|
|
break;
|
|
default:
|
|
/* set default 1 bit mode */
|
|
slot->ctype = SDMMC_CTYPE_1BIT;
|
|
}
|
|
|
|
regs = mci_readl(slot->host, UHS_REG);
|
|
|
|
/* DDR mode set */
|
|
if (ios->timing == MMC_TIMING_UHS_DDR50)
|
|
regs |= ((0x1 << slot->id) << 16);
|
|
else
|
|
regs &= ~((0x1 << slot->id) << 16);
|
|
|
|
mci_writel(slot->host, UHS_REG, regs);
|
|
|
|
if (ios->clock) {
|
|
/*
|
|
* Use mirror of ios->clock to prevent race with mmc
|
|
* core ios update when finding the minimum.
|
|
*/
|
|
slot->clock = ios->clock;
|
|
}
|
|
|
|
if (drv_data && drv_data->set_ios)
|
|
drv_data->set_ios(slot->host, ios);
|
|
|
|
/* Slot specific timing and width adjustment */
|
|
dw_mci_setup_bus(slot, false);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_UP:
|
|
set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
|
|
/* Power up slot */
|
|
if (slot->host->pdata->setpower)
|
|
slot->host->pdata->setpower(slot->id, mmc->ocr_avail);
|
|
regs = mci_readl(slot->host, PWREN);
|
|
regs |= (1 << slot->id);
|
|
mci_writel(slot->host, PWREN, regs);
|
|
break;
|
|
case MMC_POWER_OFF:
|
|
/* Power down slot */
|
|
if (slot->host->pdata->setpower)
|
|
slot->host->pdata->setpower(slot->id, 0);
|
|
regs = mci_readl(slot->host, PWREN);
|
|
regs &= ~(1 << slot->id);
|
|
mci_writel(slot->host, PWREN, regs);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int dw_mci_get_ro(struct mmc_host *mmc)
|
|
{
|
|
int read_only;
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct dw_mci_board *brd = slot->host->pdata;
|
|
|
|
/* Use platform get_ro function, else try on board write protect */
|
|
if (slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT)
|
|
read_only = 0;
|
|
else if (brd->get_ro)
|
|
read_only = brd->get_ro(slot->id);
|
|
else if (gpio_is_valid(slot->wp_gpio))
|
|
read_only = gpio_get_value(slot->wp_gpio);
|
|
else
|
|
read_only =
|
|
mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
|
|
|
|
dev_dbg(&mmc->class_dev, "card is %s\n",
|
|
read_only ? "read-only" : "read-write");
|
|
|
|
return read_only;
|
|
}
|
|
|
|
static int dw_mci_get_cd(struct mmc_host *mmc)
|
|
{
|
|
int present;
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct dw_mci_board *brd = slot->host->pdata;
|
|
|
|
/* Use platform get_cd function, else try onboard card detect */
|
|
if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
|
|
present = 1;
|
|
else if (brd->get_cd)
|
|
present = !brd->get_cd(slot->id);
|
|
else
|
|
present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
|
|
== 0 ? 1 : 0;
|
|
|
|
if (present)
|
|
dev_dbg(&mmc->class_dev, "card is present\n");
|
|
else
|
|
dev_dbg(&mmc->class_dev, "card is not present\n");
|
|
|
|
return present;
|
|
}
|
|
|
|
/*
|
|
* Disable lower power mode.
|
|
*
|
|
* Low power mode will stop the card clock when idle. According to the
|
|
* description of the CLKENA register we should disable low power mode
|
|
* for SDIO cards if we need SDIO interrupts to work.
|
|
*
|
|
* This function is fast if low power mode is already disabled.
|
|
*/
|
|
static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
|
|
{
|
|
struct dw_mci *host = slot->host;
|
|
u32 clk_en_a;
|
|
const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
|
|
|
|
clk_en_a = mci_readl(host, CLKENA);
|
|
|
|
if (clk_en_a & clken_low_pwr) {
|
|
mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
|
|
mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
|
|
SDMMC_CMD_PRV_DAT_WAIT, 0);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
|
|
{
|
|
struct dw_mci_slot *slot = mmc_priv(mmc);
|
|
struct dw_mci *host = slot->host;
|
|
u32 int_mask;
|
|
|
|
/* Enable/disable Slot Specific SDIO interrupt */
|
|
int_mask = mci_readl(host, INTMASK);
|
|
if (enb) {
|
|
/*
|
|
* Turn off low power mode if it was enabled. This is a bit of
|
|
* a heavy operation and we disable / enable IRQs a lot, so
|
|
* we'll leave low power mode disabled and it will get
|
|
* re-enabled again in dw_mci_setup_bus().
|
|
*/
|
|
dw_mci_disable_low_power(slot);
|
|
|
|
mci_writel(host, INTMASK,
|
|
(int_mask | SDMMC_INT_SDIO(slot->id)));
|
|
} else {
|
|
mci_writel(host, INTMASK,
|
|
(int_mask & ~SDMMC_INT_SDIO(slot->id)));
|
|
}
|
|
}
|
|
|
|
static const struct mmc_host_ops dw_mci_ops = {
|
|
.request = dw_mci_request,
|
|
.pre_req = dw_mci_pre_req,
|
|
.post_req = dw_mci_post_req,
|
|
.set_ios = dw_mci_set_ios,
|
|
.get_ro = dw_mci_get_ro,
|
|
.get_cd = dw_mci_get_cd,
|
|
.enable_sdio_irq = dw_mci_enable_sdio_irq,
|
|
};
|
|
|
|
static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
|
|
__releases(&host->lock)
|
|
__acquires(&host->lock)
|
|
{
|
|
struct dw_mci_slot *slot;
|
|
struct mmc_host *prev_mmc = host->cur_slot->mmc;
|
|
|
|
WARN_ON(host->cmd || host->data);
|
|
|
|
host->cur_slot->mrq = NULL;
|
|
host->mrq = NULL;
|
|
if (!list_empty(&host->queue)) {
|
|
slot = list_entry(host->queue.next,
|
|
struct dw_mci_slot, queue_node);
|
|
list_del(&slot->queue_node);
|
|
dev_vdbg(host->dev, "list not empty: %s is next\n",
|
|
mmc_hostname(slot->mmc));
|
|
host->state = STATE_SENDING_CMD;
|
|
dw_mci_start_request(host, slot);
|
|
} else {
|
|
dev_vdbg(host->dev, "list empty\n");
|
|
host->state = STATE_IDLE;
|
|
}
|
|
|
|
spin_unlock(&host->lock);
|
|
mmc_request_done(prev_mmc, mrq);
|
|
spin_lock(&host->lock);
|
|
}
|
|
|
|
static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
|
|
{
|
|
u32 status = host->cmd_status;
|
|
|
|
host->cmd_status = 0;
|
|
|
|
/* Read the response from the card (up to 16 bytes) */
|
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
|
if (cmd->flags & MMC_RSP_136) {
|
|
cmd->resp[3] = mci_readl(host, RESP0);
|
|
cmd->resp[2] = mci_readl(host, RESP1);
|
|
cmd->resp[1] = mci_readl(host, RESP2);
|
|
cmd->resp[0] = mci_readl(host, RESP3);
|
|
} else {
|
|
cmd->resp[0] = mci_readl(host, RESP0);
|
|
cmd->resp[1] = 0;
|
|
cmd->resp[2] = 0;
|
|
cmd->resp[3] = 0;
|
|
}
|
|
}
|
|
|
|
if (status & SDMMC_INT_RTO)
|
|
cmd->error = -ETIMEDOUT;
|
|
else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
|
|
cmd->error = -EILSEQ;
|
|
else if (status & SDMMC_INT_RESP_ERR)
|
|
cmd->error = -EIO;
|
|
else
|
|
cmd->error = 0;
|
|
|
|
if (cmd->error) {
|
|
/* newer ip versions need a delay between retries */
|
|
if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
|
|
mdelay(20);
|
|
|
|
if (cmd->data) {
|
|
dw_mci_stop_dma(host);
|
|
host->data = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dw_mci_tasklet_func(unsigned long priv)
|
|
{
|
|
struct dw_mci *host = (struct dw_mci *)priv;
|
|
struct mmc_data *data;
|
|
struct mmc_command *cmd;
|
|
enum dw_mci_state state;
|
|
enum dw_mci_state prev_state;
|
|
u32 status, ctrl;
|
|
|
|
spin_lock(&host->lock);
|
|
|
|
state = host->state;
|
|
data = host->data;
|
|
|
|
do {
|
|
prev_state = state;
|
|
|
|
switch (state) {
|
|
case STATE_IDLE:
|
|
break;
|
|
|
|
case STATE_SENDING_CMD:
|
|
if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
|
|
&host->pending_events))
|
|
break;
|
|
|
|
cmd = host->cmd;
|
|
host->cmd = NULL;
|
|
set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
|
|
dw_mci_command_complete(host, cmd);
|
|
if (cmd == host->mrq->sbc && !cmd->error) {
|
|
prev_state = state = STATE_SENDING_CMD;
|
|
__dw_mci_start_request(host, host->cur_slot,
|
|
host->mrq->cmd);
|
|
goto unlock;
|
|
}
|
|
|
|
if (!host->mrq->data || cmd->error) {
|
|
dw_mci_request_end(host, host->mrq);
|
|
goto unlock;
|
|
}
|
|
|
|
prev_state = state = STATE_SENDING_DATA;
|
|
/* fall through */
|
|
|
|
case STATE_SENDING_DATA:
|
|
if (test_and_clear_bit(EVENT_DATA_ERROR,
|
|
&host->pending_events)) {
|
|
dw_mci_stop_dma(host);
|
|
if (data->stop)
|
|
send_stop_cmd(host, data);
|
|
state = STATE_DATA_ERROR;
|
|
break;
|
|
}
|
|
|
|
if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
|
|
&host->pending_events))
|
|
break;
|
|
|
|
set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
|
|
prev_state = state = STATE_DATA_BUSY;
|
|
/* fall through */
|
|
|
|
case STATE_DATA_BUSY:
|
|
if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
|
|
&host->pending_events))
|
|
break;
|
|
|
|
host->data = NULL;
|
|
set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
|
|
status = host->data_status;
|
|
|
|
if (status & DW_MCI_DATA_ERROR_FLAGS) {
|
|
if (status & SDMMC_INT_DTO) {
|
|
data->error = -ETIMEDOUT;
|
|
} else if (status & SDMMC_INT_DCRC) {
|
|
data->error = -EILSEQ;
|
|
} else if (status & SDMMC_INT_EBE &&
|
|
host->dir_status ==
|
|
DW_MCI_SEND_STATUS) {
|
|
/*
|
|
* No data CRC status was returned.
|
|
* The number of bytes transferred will
|
|
* be exaggerated in PIO mode.
|
|
*/
|
|
data->bytes_xfered = 0;
|
|
data->error = -ETIMEDOUT;
|
|
} else {
|
|
dev_err(host->dev,
|
|
"data FIFO error "
|
|
"(status=%08x)\n",
|
|
status);
|
|
data->error = -EIO;
|
|
}
|
|
/*
|
|
* After an error, there may be data lingering
|
|
* in the FIFO, so reset it - doing so
|
|
* generates a block interrupt, hence setting
|
|
* the scatter-gather pointer to NULL.
|
|
*/
|
|
sg_miter_stop(&host->sg_miter);
|
|
host->sg = NULL;
|
|
ctrl = mci_readl(host, CTRL);
|
|
ctrl |= SDMMC_CTRL_FIFO_RESET;
|
|
mci_writel(host, CTRL, ctrl);
|
|
} else {
|
|
data->bytes_xfered = data->blocks * data->blksz;
|
|
data->error = 0;
|
|
}
|
|
|
|
if (!data->stop) {
|
|
dw_mci_request_end(host, host->mrq);
|
|
goto unlock;
|
|
}
|
|
|
|
if (host->mrq->sbc && !data->error) {
|
|
data->stop->error = 0;
|
|
dw_mci_request_end(host, host->mrq);
|
|
goto unlock;
|
|
}
|
|
|
|
prev_state = state = STATE_SENDING_STOP;
|
|
if (!data->error)
|
|
send_stop_cmd(host, data);
|
|
/* fall through */
|
|
|
|
case STATE_SENDING_STOP:
|
|
if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
|
|
&host->pending_events))
|
|
break;
|
|
|
|
host->cmd = NULL;
|
|
dw_mci_command_complete(host, host->mrq->stop);
|
|
dw_mci_request_end(host, host->mrq);
|
|
goto unlock;
|
|
|
|
case STATE_DATA_ERROR:
|
|
if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
|
|
&host->pending_events))
|
|
break;
|
|
|
|
state = STATE_DATA_BUSY;
|
|
break;
|
|
}
|
|
} while (state != prev_state);
|
|
|
|
host->state = state;
|
|
unlock:
|
|
spin_unlock(&host->lock);
|
|
|
|
}
|
|
|
|
/* push final bytes to part_buf, only use during push */
|
|
static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
memcpy((void *)&host->part_buf, buf, cnt);
|
|
host->part_buf_count = cnt;
|
|
}
|
|
|
|
/* append bytes to part_buf, only use during push */
|
|
static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
|
|
memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
|
|
host->part_buf_count += cnt;
|
|
return cnt;
|
|
}
|
|
|
|
/* pull first bytes from part_buf, only use during pull */
|
|
static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
cnt = min(cnt, (int)host->part_buf_count);
|
|
if (cnt) {
|
|
memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
|
|
cnt);
|
|
host->part_buf_count -= cnt;
|
|
host->part_buf_start += cnt;
|
|
}
|
|
return cnt;
|
|
}
|
|
|
|
/* pull final bytes from the part_buf, assuming it's just been filled */
|
|
static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
memcpy(buf, &host->part_buf, cnt);
|
|
host->part_buf_start = cnt;
|
|
host->part_buf_count = (1 << host->data_shift) - cnt;
|
|
}
|
|
|
|
static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
struct mmc_data *data = host->data;
|
|
int init_cnt = cnt;
|
|
|
|
/* try and push anything in the part_buf */
|
|
if (unlikely(host->part_buf_count)) {
|
|
int len = dw_mci_push_part_bytes(host, buf, cnt);
|
|
buf += len;
|
|
cnt -= len;
|
|
if (host->part_buf_count == 2) {
|
|
mci_writew(host, DATA(host->data_offset),
|
|
host->part_buf16);
|
|
host->part_buf_count = 0;
|
|
}
|
|
}
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x1)) {
|
|
while (cnt >= 2) {
|
|
u16 aligned_buf[64];
|
|
int len = min(cnt & -2, (int)sizeof(aligned_buf));
|
|
int items = len >> 1;
|
|
int i;
|
|
/* memcpy from input buffer into aligned buffer */
|
|
memcpy(aligned_buf, buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
/* push data from aligned buffer into fifo */
|
|
for (i = 0; i < items; ++i)
|
|
mci_writew(host, DATA(host->data_offset),
|
|
aligned_buf[i]);
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u16 *pdata = buf;
|
|
for (; cnt >= 2; cnt -= 2)
|
|
mci_writew(host, DATA(host->data_offset), *pdata++);
|
|
buf = pdata;
|
|
}
|
|
/* put anything remaining in the part_buf */
|
|
if (cnt) {
|
|
dw_mci_set_part_bytes(host, buf, cnt);
|
|
/* Push data if we have reached the expected data length */
|
|
if ((data->bytes_xfered + init_cnt) ==
|
|
(data->blksz * data->blocks))
|
|
mci_writew(host, DATA(host->data_offset),
|
|
host->part_buf16);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x1)) {
|
|
while (cnt >= 2) {
|
|
/* pull data from fifo into aligned buffer */
|
|
u16 aligned_buf[64];
|
|
int len = min(cnt & -2, (int)sizeof(aligned_buf));
|
|
int items = len >> 1;
|
|
int i;
|
|
for (i = 0; i < items; ++i)
|
|
aligned_buf[i] = mci_readw(host,
|
|
DATA(host->data_offset));
|
|
/* memcpy from aligned buffer into output buffer */
|
|
memcpy(buf, aligned_buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u16 *pdata = buf;
|
|
for (; cnt >= 2; cnt -= 2)
|
|
*pdata++ = mci_readw(host, DATA(host->data_offset));
|
|
buf = pdata;
|
|
}
|
|
if (cnt) {
|
|
host->part_buf16 = mci_readw(host, DATA(host->data_offset));
|
|
dw_mci_pull_final_bytes(host, buf, cnt);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
struct mmc_data *data = host->data;
|
|
int init_cnt = cnt;
|
|
|
|
/* try and push anything in the part_buf */
|
|
if (unlikely(host->part_buf_count)) {
|
|
int len = dw_mci_push_part_bytes(host, buf, cnt);
|
|
buf += len;
|
|
cnt -= len;
|
|
if (host->part_buf_count == 4) {
|
|
mci_writel(host, DATA(host->data_offset),
|
|
host->part_buf32);
|
|
host->part_buf_count = 0;
|
|
}
|
|
}
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x3)) {
|
|
while (cnt >= 4) {
|
|
u32 aligned_buf[32];
|
|
int len = min(cnt & -4, (int)sizeof(aligned_buf));
|
|
int items = len >> 2;
|
|
int i;
|
|
/* memcpy from input buffer into aligned buffer */
|
|
memcpy(aligned_buf, buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
/* push data from aligned buffer into fifo */
|
|
for (i = 0; i < items; ++i)
|
|
mci_writel(host, DATA(host->data_offset),
|
|
aligned_buf[i]);
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u32 *pdata = buf;
|
|
for (; cnt >= 4; cnt -= 4)
|
|
mci_writel(host, DATA(host->data_offset), *pdata++);
|
|
buf = pdata;
|
|
}
|
|
/* put anything remaining in the part_buf */
|
|
if (cnt) {
|
|
dw_mci_set_part_bytes(host, buf, cnt);
|
|
/* Push data if we have reached the expected data length */
|
|
if ((data->bytes_xfered + init_cnt) ==
|
|
(data->blksz * data->blocks))
|
|
mci_writel(host, DATA(host->data_offset),
|
|
host->part_buf32);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x3)) {
|
|
while (cnt >= 4) {
|
|
/* pull data from fifo into aligned buffer */
|
|
u32 aligned_buf[32];
|
|
int len = min(cnt & -4, (int)sizeof(aligned_buf));
|
|
int items = len >> 2;
|
|
int i;
|
|
for (i = 0; i < items; ++i)
|
|
aligned_buf[i] = mci_readl(host,
|
|
DATA(host->data_offset));
|
|
/* memcpy from aligned buffer into output buffer */
|
|
memcpy(buf, aligned_buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u32 *pdata = buf;
|
|
for (; cnt >= 4; cnt -= 4)
|
|
*pdata++ = mci_readl(host, DATA(host->data_offset));
|
|
buf = pdata;
|
|
}
|
|
if (cnt) {
|
|
host->part_buf32 = mci_readl(host, DATA(host->data_offset));
|
|
dw_mci_pull_final_bytes(host, buf, cnt);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
struct mmc_data *data = host->data;
|
|
int init_cnt = cnt;
|
|
|
|
/* try and push anything in the part_buf */
|
|
if (unlikely(host->part_buf_count)) {
|
|
int len = dw_mci_push_part_bytes(host, buf, cnt);
|
|
buf += len;
|
|
cnt -= len;
|
|
|
|
if (host->part_buf_count == 8) {
|
|
mci_writeq(host, DATA(host->data_offset),
|
|
host->part_buf);
|
|
host->part_buf_count = 0;
|
|
}
|
|
}
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x7)) {
|
|
while (cnt >= 8) {
|
|
u64 aligned_buf[16];
|
|
int len = min(cnt & -8, (int)sizeof(aligned_buf));
|
|
int items = len >> 3;
|
|
int i;
|
|
/* memcpy from input buffer into aligned buffer */
|
|
memcpy(aligned_buf, buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
/* push data from aligned buffer into fifo */
|
|
for (i = 0; i < items; ++i)
|
|
mci_writeq(host, DATA(host->data_offset),
|
|
aligned_buf[i]);
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u64 *pdata = buf;
|
|
for (; cnt >= 8; cnt -= 8)
|
|
mci_writeq(host, DATA(host->data_offset), *pdata++);
|
|
buf = pdata;
|
|
}
|
|
/* put anything remaining in the part_buf */
|
|
if (cnt) {
|
|
dw_mci_set_part_bytes(host, buf, cnt);
|
|
/* Push data if we have reached the expected data length */
|
|
if ((data->bytes_xfered + init_cnt) ==
|
|
(data->blksz * data->blocks))
|
|
mci_writeq(host, DATA(host->data_offset),
|
|
host->part_buf);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
if (unlikely((unsigned long)buf & 0x7)) {
|
|
while (cnt >= 8) {
|
|
/* pull data from fifo into aligned buffer */
|
|
u64 aligned_buf[16];
|
|
int len = min(cnt & -8, (int)sizeof(aligned_buf));
|
|
int items = len >> 3;
|
|
int i;
|
|
for (i = 0; i < items; ++i)
|
|
aligned_buf[i] = mci_readq(host,
|
|
DATA(host->data_offset));
|
|
/* memcpy from aligned buffer into output buffer */
|
|
memcpy(buf, aligned_buf, len);
|
|
buf += len;
|
|
cnt -= len;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
u64 *pdata = buf;
|
|
for (; cnt >= 8; cnt -= 8)
|
|
*pdata++ = mci_readq(host, DATA(host->data_offset));
|
|
buf = pdata;
|
|
}
|
|
if (cnt) {
|
|
host->part_buf = mci_readq(host, DATA(host->data_offset));
|
|
dw_mci_pull_final_bytes(host, buf, cnt);
|
|
}
|
|
}
|
|
|
|
static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
|
|
{
|
|
int len;
|
|
|
|
/* get remaining partial bytes */
|
|
len = dw_mci_pull_part_bytes(host, buf, cnt);
|
|
if (unlikely(len == cnt))
|
|
return;
|
|
buf += len;
|
|
cnt -= len;
|
|
|
|
/* get the rest of the data */
|
|
host->pull_data(host, buf, cnt);
|
|
}
|
|
|
|
static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
|
|
{
|
|
struct sg_mapping_iter *sg_miter = &host->sg_miter;
|
|
void *buf;
|
|
unsigned int offset;
|
|
struct mmc_data *data = host->data;
|
|
int shift = host->data_shift;
|
|
u32 status;
|
|
unsigned int len;
|
|
unsigned int remain, fcnt;
|
|
|
|
do {
|
|
if (!sg_miter_next(sg_miter))
|
|
goto done;
|
|
|
|
host->sg = sg_miter->piter.sg;
|
|
buf = sg_miter->addr;
|
|
remain = sg_miter->length;
|
|
offset = 0;
|
|
|
|
do {
|
|
fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
|
|
<< shift) + host->part_buf_count;
|
|
len = min(remain, fcnt);
|
|
if (!len)
|
|
break;
|
|
dw_mci_pull_data(host, (void *)(buf + offset), len);
|
|
data->bytes_xfered += len;
|
|
offset += len;
|
|
remain -= len;
|
|
} while (remain);
|
|
|
|
sg_miter->consumed = offset;
|
|
status = mci_readl(host, MINTSTS);
|
|
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
|
|
/* if the RXDR is ready read again */
|
|
} while ((status & SDMMC_INT_RXDR) ||
|
|
(dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
|
|
|
|
if (!remain) {
|
|
if (!sg_miter_next(sg_miter))
|
|
goto done;
|
|
sg_miter->consumed = 0;
|
|
}
|
|
sg_miter_stop(sg_miter);
|
|
return;
|
|
|
|
done:
|
|
sg_miter_stop(sg_miter);
|
|
host->sg = NULL;
|
|
smp_wmb();
|
|
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
|
|
}
|
|
|
|
static void dw_mci_write_data_pio(struct dw_mci *host)
|
|
{
|
|
struct sg_mapping_iter *sg_miter = &host->sg_miter;
|
|
void *buf;
|
|
unsigned int offset;
|
|
struct mmc_data *data = host->data;
|
|
int shift = host->data_shift;
|
|
u32 status;
|
|
unsigned int len;
|
|
unsigned int fifo_depth = host->fifo_depth;
|
|
unsigned int remain, fcnt;
|
|
|
|
do {
|
|
if (!sg_miter_next(sg_miter))
|
|
goto done;
|
|
|
|
host->sg = sg_miter->piter.sg;
|
|
buf = sg_miter->addr;
|
|
remain = sg_miter->length;
|
|
offset = 0;
|
|
|
|
do {
|
|
fcnt = ((fifo_depth -
|
|
SDMMC_GET_FCNT(mci_readl(host, STATUS)))
|
|
<< shift) - host->part_buf_count;
|
|
len = min(remain, fcnt);
|
|
if (!len)
|
|
break;
|
|
host->push_data(host, (void *)(buf + offset), len);
|
|
data->bytes_xfered += len;
|
|
offset += len;
|
|
remain -= len;
|
|
} while (remain);
|
|
|
|
sg_miter->consumed = offset;
|
|
status = mci_readl(host, MINTSTS);
|
|
mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
|
|
} while (status & SDMMC_INT_TXDR); /* if TXDR write again */
|
|
|
|
if (!remain) {
|
|
if (!sg_miter_next(sg_miter))
|
|
goto done;
|
|
sg_miter->consumed = 0;
|
|
}
|
|
sg_miter_stop(sg_miter);
|
|
return;
|
|
|
|
done:
|
|
sg_miter_stop(sg_miter);
|
|
host->sg = NULL;
|
|
smp_wmb();
|
|
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
|
|
}
|
|
|
|
static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
|
|
{
|
|
if (!host->cmd_status)
|
|
host->cmd_status = status;
|
|
|
|
smp_wmb();
|
|
|
|
set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
|
|
tasklet_schedule(&host->tasklet);
|
|
}
|
|
|
|
static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct dw_mci *host = dev_id;
|
|
u32 pending;
|
|
int i;
|
|
|
|
pending = mci_readl(host, MINTSTS); /* read-only mask reg */
|
|
|
|
if (pending) {
|
|
|
|
/*
|
|
* DTO fix - version 2.10a and below, and only if internal DMA
|
|
* is configured.
|
|
*/
|
|
if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
|
|
if (!pending &&
|
|
((mci_readl(host, STATUS) >> 17) & 0x1fff))
|
|
pending |= SDMMC_INT_DATA_OVER;
|
|
}
|
|
|
|
if (pending & DW_MCI_CMD_ERROR_FLAGS) {
|
|
mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
|
|
host->cmd_status = pending;
|
|
smp_wmb();
|
|
set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
|
|
}
|
|
|
|
if (pending & DW_MCI_DATA_ERROR_FLAGS) {
|
|
/* if there is an error report DATA_ERROR */
|
|
mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
|
|
host->data_status = pending;
|
|
smp_wmb();
|
|
set_bit(EVENT_DATA_ERROR, &host->pending_events);
|
|
tasklet_schedule(&host->tasklet);
|
|
}
|
|
|
|
if (pending & SDMMC_INT_DATA_OVER) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
|
|
if (!host->data_status)
|
|
host->data_status = pending;
|
|
smp_wmb();
|
|
if (host->dir_status == DW_MCI_RECV_STATUS) {
|
|
if (host->sg != NULL)
|
|
dw_mci_read_data_pio(host, true);
|
|
}
|
|
set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
|
|
tasklet_schedule(&host->tasklet);
|
|
}
|
|
|
|
if (pending & SDMMC_INT_RXDR) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
|
|
if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
|
|
dw_mci_read_data_pio(host, false);
|
|
}
|
|
|
|
if (pending & SDMMC_INT_TXDR) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
|
|
if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
|
|
dw_mci_write_data_pio(host);
|
|
}
|
|
|
|
if (pending & SDMMC_INT_CMD_DONE) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
|
|
dw_mci_cmd_interrupt(host, pending);
|
|
}
|
|
|
|
if (pending & SDMMC_INT_CD) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_CD);
|
|
queue_work(host->card_workqueue, &host->card_work);
|
|
}
|
|
|
|
/* Handle SDIO Interrupts */
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
struct dw_mci_slot *slot = host->slot[i];
|
|
if (pending & SDMMC_INT_SDIO(i)) {
|
|
mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
|
|
mmc_signal_sdio_irq(slot->mmc);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_MMC_DW_IDMAC
|
|
/* Handle DMA interrupts */
|
|
pending = mci_readl(host, IDSTS);
|
|
if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
|
|
mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
|
|
mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
|
|
host->dma_ops->complete(host);
|
|
}
|
|
#endif
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void dw_mci_work_routine_card(struct work_struct *work)
|
|
{
|
|
struct dw_mci *host = container_of(work, struct dw_mci, card_work);
|
|
int i;
|
|
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
struct dw_mci_slot *slot = host->slot[i];
|
|
struct mmc_host *mmc = slot->mmc;
|
|
struct mmc_request *mrq;
|
|
int present;
|
|
u32 ctrl;
|
|
|
|
present = dw_mci_get_cd(mmc);
|
|
while (present != slot->last_detect_state) {
|
|
dev_dbg(&slot->mmc->class_dev, "card %s\n",
|
|
present ? "inserted" : "removed");
|
|
|
|
spin_lock_bh(&host->lock);
|
|
|
|
/* Card change detected */
|
|
slot->last_detect_state = present;
|
|
|
|
/* Mark card as present if applicable */
|
|
if (present != 0)
|
|
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
|
|
|
|
/* Clean up queue if present */
|
|
mrq = slot->mrq;
|
|
if (mrq) {
|
|
if (mrq == host->mrq) {
|
|
host->data = NULL;
|
|
host->cmd = NULL;
|
|
|
|
switch (host->state) {
|
|
case STATE_IDLE:
|
|
break;
|
|
case STATE_SENDING_CMD:
|
|
mrq->cmd->error = -ENOMEDIUM;
|
|
if (!mrq->data)
|
|
break;
|
|
/* fall through */
|
|
case STATE_SENDING_DATA:
|
|
mrq->data->error = -ENOMEDIUM;
|
|
dw_mci_stop_dma(host);
|
|
break;
|
|
case STATE_DATA_BUSY:
|
|
case STATE_DATA_ERROR:
|
|
if (mrq->data->error == -EINPROGRESS)
|
|
mrq->data->error = -ENOMEDIUM;
|
|
if (!mrq->stop)
|
|
break;
|
|
/* fall through */
|
|
case STATE_SENDING_STOP:
|
|
mrq->stop->error = -ENOMEDIUM;
|
|
break;
|
|
}
|
|
|
|
dw_mci_request_end(host, mrq);
|
|
} else {
|
|
list_del(&slot->queue_node);
|
|
mrq->cmd->error = -ENOMEDIUM;
|
|
if (mrq->data)
|
|
mrq->data->error = -ENOMEDIUM;
|
|
if (mrq->stop)
|
|
mrq->stop->error = -ENOMEDIUM;
|
|
|
|
spin_unlock(&host->lock);
|
|
mmc_request_done(slot->mmc, mrq);
|
|
spin_lock(&host->lock);
|
|
}
|
|
}
|
|
|
|
/* Power down slot */
|
|
if (present == 0) {
|
|
clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
|
|
|
|
/*
|
|
* Clear down the FIFO - doing so generates a
|
|
* block interrupt, hence setting the
|
|
* scatter-gather pointer to NULL.
|
|
*/
|
|
sg_miter_stop(&host->sg_miter);
|
|
host->sg = NULL;
|
|
|
|
ctrl = mci_readl(host, CTRL);
|
|
ctrl |= SDMMC_CTRL_FIFO_RESET;
|
|
mci_writel(host, CTRL, ctrl);
|
|
|
|
#ifdef CONFIG_MMC_DW_IDMAC
|
|
ctrl = mci_readl(host, BMOD);
|
|
/* Software reset of DMA */
|
|
ctrl |= SDMMC_IDMAC_SWRESET;
|
|
mci_writel(host, BMOD, ctrl);
|
|
#endif
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&host->lock);
|
|
|
|
present = dw_mci_get_cd(mmc);
|
|
}
|
|
|
|
mmc_detect_change(slot->mmc,
|
|
msecs_to_jiffies(host->pdata->detect_delay_ms));
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
/* given a slot id, find out the device node representing that slot */
|
|
static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
|
|
{
|
|
struct device_node *np;
|
|
const __be32 *addr;
|
|
int len;
|
|
|
|
if (!dev || !dev->of_node)
|
|
return NULL;
|
|
|
|
for_each_child_of_node(dev->of_node, np) {
|
|
addr = of_get_property(np, "reg", &len);
|
|
if (!addr || (len < sizeof(int)))
|
|
continue;
|
|
if (be32_to_cpup(addr) == slot)
|
|
return np;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct dw_mci_of_slot_quirks {
|
|
char *quirk;
|
|
int id;
|
|
} of_slot_quirks[] = {
|
|
{
|
|
.quirk = "disable-wp",
|
|
.id = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
|
|
},
|
|
};
|
|
|
|
static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
|
|
{
|
|
struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
|
|
int quirks = 0;
|
|
int idx;
|
|
|
|
/* get quirks */
|
|
for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
|
|
if (of_get_property(np, of_slot_quirks[idx].quirk, NULL))
|
|
quirks |= of_slot_quirks[idx].id;
|
|
|
|
return quirks;
|
|
}
|
|
|
|
/* find out bus-width for a given slot */
|
|
static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
|
|
{
|
|
struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
|
|
u32 bus_wd = 1;
|
|
|
|
if (!np)
|
|
return 1;
|
|
|
|
if (of_property_read_u32(np, "bus-width", &bus_wd))
|
|
dev_err(dev, "bus-width property not found, assuming width"
|
|
" as 1\n");
|
|
return bus_wd;
|
|
}
|
|
|
|
/* find the write protect gpio for a given slot; or -1 if none specified */
|
|
static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
|
|
{
|
|
struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
|
|
int gpio;
|
|
|
|
if (!np)
|
|
return -EINVAL;
|
|
|
|
gpio = of_get_named_gpio(np, "wp-gpios", 0);
|
|
|
|
/* Having a missing entry is valid; return silently */
|
|
if (!gpio_is_valid(gpio))
|
|
return -EINVAL;
|
|
|
|
if (devm_gpio_request(dev, gpio, "dw-mci-wp")) {
|
|
dev_warn(dev, "gpio [%d] request failed\n", gpio);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return gpio;
|
|
}
|
|
#else /* CONFIG_OF */
|
|
static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
|
|
{
|
|
return 0;
|
|
}
|
|
static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
|
|
{
|
|
return 1;
|
|
}
|
|
static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
|
|
{
|
|
return NULL;
|
|
}
|
|
static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif /* CONFIG_OF */
|
|
|
|
static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct dw_mci_slot *slot;
|
|
const struct dw_mci_drv_data *drv_data = host->drv_data;
|
|
int ctrl_id, ret;
|
|
u8 bus_width;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
|
|
if (!mmc)
|
|
return -ENOMEM;
|
|
|
|
slot = mmc_priv(mmc);
|
|
slot->id = id;
|
|
slot->mmc = mmc;
|
|
slot->host = host;
|
|
host->slot[id] = slot;
|
|
|
|
slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
|
|
|
|
mmc->ops = &dw_mci_ops;
|
|
mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
|
|
mmc->f_max = host->bus_hz;
|
|
|
|
if (host->pdata->get_ocr)
|
|
mmc->ocr_avail = host->pdata->get_ocr(id);
|
|
else
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
|
|
/*
|
|
* Start with slot power disabled, it will be enabled when a card
|
|
* is detected.
|
|
*/
|
|
if (host->pdata->setpower)
|
|
host->pdata->setpower(id, 0);
|
|
|
|
if (host->pdata->caps)
|
|
mmc->caps = host->pdata->caps;
|
|
|
|
if (host->pdata->pm_caps)
|
|
mmc->pm_caps = host->pdata->pm_caps;
|
|
|
|
if (host->dev->of_node) {
|
|
ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
|
|
if (ctrl_id < 0)
|
|
ctrl_id = 0;
|
|
} else {
|
|
ctrl_id = to_platform_device(host->dev)->id;
|
|
}
|
|
if (drv_data && drv_data->caps)
|
|
mmc->caps |= drv_data->caps[ctrl_id];
|
|
|
|
if (host->pdata->caps2)
|
|
mmc->caps2 = host->pdata->caps2;
|
|
|
|
if (host->pdata->get_bus_wd)
|
|
bus_width = host->pdata->get_bus_wd(slot->id);
|
|
else if (host->dev->of_node)
|
|
bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
|
|
else
|
|
bus_width = 1;
|
|
|
|
if (drv_data && drv_data->setup_bus) {
|
|
struct device_node *slot_np;
|
|
slot_np = dw_mci_of_find_slot_node(host->dev, slot->id);
|
|
ret = drv_data->setup_bus(host, slot_np, bus_width);
|
|
if (ret)
|
|
goto err_setup_bus;
|
|
}
|
|
|
|
switch (bus_width) {
|
|
case 8:
|
|
mmc->caps |= MMC_CAP_8_BIT_DATA;
|
|
case 4:
|
|
mmc->caps |= MMC_CAP_4_BIT_DATA;
|
|
}
|
|
|
|
if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
|
|
mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
|
|
|
|
if (host->pdata->blk_settings) {
|
|
mmc->max_segs = host->pdata->blk_settings->max_segs;
|
|
mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
|
|
mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
|
|
mmc->max_req_size = host->pdata->blk_settings->max_req_size;
|
|
mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
|
|
} else {
|
|
/* Useful defaults if platform data is unset. */
|
|
#ifdef CONFIG_MMC_DW_IDMAC
|
|
mmc->max_segs = host->ring_size;
|
|
mmc->max_blk_size = 65536;
|
|
mmc->max_blk_count = host->ring_size;
|
|
mmc->max_seg_size = 0x1000;
|
|
mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
|
|
#else
|
|
mmc->max_segs = 64;
|
|
mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
|
|
mmc->max_blk_count = 512;
|
|
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
#endif /* CONFIG_MMC_DW_IDMAC */
|
|
}
|
|
|
|
host->vmmc = devm_regulator_get(mmc_dev(mmc), "vmmc");
|
|
if (IS_ERR(host->vmmc)) {
|
|
pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
|
|
host->vmmc = NULL;
|
|
} else {
|
|
ret = regulator_enable(host->vmmc);
|
|
if (ret) {
|
|
dev_err(host->dev,
|
|
"failed to enable regulator: %d\n", ret);
|
|
goto err_setup_bus;
|
|
}
|
|
}
|
|
|
|
if (dw_mci_get_cd(mmc))
|
|
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
|
|
else
|
|
clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
|
|
|
|
slot->wp_gpio = dw_mci_of_get_wp_gpio(host->dev, slot->id);
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret)
|
|
goto err_setup_bus;
|
|
|
|
#if defined(CONFIG_DEBUG_FS)
|
|
dw_mci_init_debugfs(slot);
|
|
#endif
|
|
|
|
/* Card initially undetected */
|
|
slot->last_detect_state = 0;
|
|
|
|
/*
|
|
* Card may have been plugged in prior to boot so we
|
|
* need to run the detect tasklet
|
|
*/
|
|
queue_work(host->card_workqueue, &host->card_work);
|
|
|
|
return 0;
|
|
|
|
err_setup_bus:
|
|
mmc_free_host(mmc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
|
|
{
|
|
/* Shutdown detect IRQ */
|
|
if (slot->host->pdata->exit)
|
|
slot->host->pdata->exit(id);
|
|
|
|
/* Debugfs stuff is cleaned up by mmc core */
|
|
mmc_remove_host(slot->mmc);
|
|
slot->host->slot[id] = NULL;
|
|
mmc_free_host(slot->mmc);
|
|
}
|
|
|
|
static void dw_mci_init_dma(struct dw_mci *host)
|
|
{
|
|
/* Alloc memory for sg translation */
|
|
host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
|
|
&host->sg_dma, GFP_KERNEL);
|
|
if (!host->sg_cpu) {
|
|
dev_err(host->dev, "%s: could not alloc DMA memory\n",
|
|
__func__);
|
|
goto no_dma;
|
|
}
|
|
|
|
/* Determine which DMA interface to use */
|
|
#ifdef CONFIG_MMC_DW_IDMAC
|
|
host->dma_ops = &dw_mci_idmac_ops;
|
|
dev_info(host->dev, "Using internal DMA controller.\n");
|
|
#endif
|
|
|
|
if (!host->dma_ops)
|
|
goto no_dma;
|
|
|
|
if (host->dma_ops->init && host->dma_ops->start &&
|
|
host->dma_ops->stop && host->dma_ops->cleanup) {
|
|
if (host->dma_ops->init(host)) {
|
|
dev_err(host->dev, "%s: Unable to initialize "
|
|
"DMA Controller.\n", __func__);
|
|
goto no_dma;
|
|
}
|
|
} else {
|
|
dev_err(host->dev, "DMA initialization not found.\n");
|
|
goto no_dma;
|
|
}
|
|
|
|
host->use_dma = 1;
|
|
return;
|
|
|
|
no_dma:
|
|
dev_info(host->dev, "Using PIO mode.\n");
|
|
host->use_dma = 0;
|
|
return;
|
|
}
|
|
|
|
static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
|
|
{
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(500);
|
|
unsigned int ctrl;
|
|
|
|
mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
|
|
SDMMC_CTRL_DMA_RESET));
|
|
|
|
/* wait till resets clear */
|
|
do {
|
|
ctrl = mci_readl(host, CTRL);
|
|
if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
|
|
SDMMC_CTRL_DMA_RESET)))
|
|
return true;
|
|
} while (time_before(jiffies, timeout));
|
|
|
|
dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
|
|
|
|
return false;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct dw_mci_of_quirks {
|
|
char *quirk;
|
|
int id;
|
|
} of_quirks[] = {
|
|
{
|
|
.quirk = "supports-highspeed",
|
|
.id = DW_MCI_QUIRK_HIGHSPEED,
|
|
}, {
|
|
.quirk = "broken-cd",
|
|
.id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
|
|
},
|
|
};
|
|
|
|
static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
|
|
{
|
|
struct dw_mci_board *pdata;
|
|
struct device *dev = host->dev;
|
|
struct device_node *np = dev->of_node;
|
|
const struct dw_mci_drv_data *drv_data = host->drv_data;
|
|
int idx, ret;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata) {
|
|
dev_err(dev, "could not allocate memory for pdata\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/* find out number of slots supported */
|
|
if (of_property_read_u32(dev->of_node, "num-slots",
|
|
&pdata->num_slots)) {
|
|
dev_info(dev, "num-slots property not found, "
|
|
"assuming 1 slot is available\n");
|
|
pdata->num_slots = 1;
|
|
}
|
|
|
|
/* get quirks */
|
|
for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
|
|
if (of_get_property(np, of_quirks[idx].quirk, NULL))
|
|
pdata->quirks |= of_quirks[idx].id;
|
|
|
|
if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
|
|
dev_info(dev, "fifo-depth property not found, using "
|
|
"value of FIFOTH register as default\n");
|
|
|
|
of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
|
|
|
|
if (drv_data && drv_data->parse_dt) {
|
|
ret = drv_data->parse_dt(host);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
if (of_find_property(np, "keep-power-in-suspend", NULL))
|
|
pdata->pm_caps |= MMC_PM_KEEP_POWER;
|
|
|
|
if (of_find_property(np, "enable-sdio-wakeup", NULL))
|
|
pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
#else /* CONFIG_OF */
|
|
static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
#endif /* CONFIG_OF */
|
|
|
|
int dw_mci_probe(struct dw_mci *host)
|
|
{
|
|
const struct dw_mci_drv_data *drv_data = host->drv_data;
|
|
int width, i, ret = 0;
|
|
u32 fifo_size;
|
|
int init_slots = 0;
|
|
|
|
if (!host->pdata) {
|
|
host->pdata = dw_mci_parse_dt(host);
|
|
if (IS_ERR(host->pdata)) {
|
|
dev_err(host->dev, "platform data not available\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
|
|
dev_err(host->dev,
|
|
"Platform data must supply select_slot function\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
host->biu_clk = devm_clk_get(host->dev, "biu");
|
|
if (IS_ERR(host->biu_clk)) {
|
|
dev_dbg(host->dev, "biu clock not available\n");
|
|
} else {
|
|
ret = clk_prepare_enable(host->biu_clk);
|
|
if (ret) {
|
|
dev_err(host->dev, "failed to enable biu clock\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
host->ciu_clk = devm_clk_get(host->dev, "ciu");
|
|
if (IS_ERR(host->ciu_clk)) {
|
|
dev_dbg(host->dev, "ciu clock not available\n");
|
|
} else {
|
|
ret = clk_prepare_enable(host->ciu_clk);
|
|
if (ret) {
|
|
dev_err(host->dev, "failed to enable ciu clock\n");
|
|
goto err_clk_biu;
|
|
}
|
|
}
|
|
|
|
if (IS_ERR(host->ciu_clk))
|
|
host->bus_hz = host->pdata->bus_hz;
|
|
else
|
|
host->bus_hz = clk_get_rate(host->ciu_clk);
|
|
|
|
if (drv_data && drv_data->setup_clock) {
|
|
ret = drv_data->setup_clock(host);
|
|
if (ret) {
|
|
dev_err(host->dev,
|
|
"implementation specific clock setup failed\n");
|
|
goto err_clk_ciu;
|
|
}
|
|
}
|
|
|
|
if (!host->bus_hz) {
|
|
dev_err(host->dev,
|
|
"Platform data must supply bus speed\n");
|
|
ret = -ENODEV;
|
|
goto err_clk_ciu;
|
|
}
|
|
|
|
host->quirks = host->pdata->quirks;
|
|
|
|
spin_lock_init(&host->lock);
|
|
INIT_LIST_HEAD(&host->queue);
|
|
|
|
/*
|
|
* Get the host data width - this assumes that HCON has been set with
|
|
* the correct values.
|
|
*/
|
|
i = (mci_readl(host, HCON) >> 7) & 0x7;
|
|
if (!i) {
|
|
host->push_data = dw_mci_push_data16;
|
|
host->pull_data = dw_mci_pull_data16;
|
|
width = 16;
|
|
host->data_shift = 1;
|
|
} else if (i == 2) {
|
|
host->push_data = dw_mci_push_data64;
|
|
host->pull_data = dw_mci_pull_data64;
|
|
width = 64;
|
|
host->data_shift = 3;
|
|
} else {
|
|
/* Check for a reserved value, and warn if it is */
|
|
WARN((i != 1),
|
|
"HCON reports a reserved host data width!\n"
|
|
"Defaulting to 32-bit access.\n");
|
|
host->push_data = dw_mci_push_data32;
|
|
host->pull_data = dw_mci_pull_data32;
|
|
width = 32;
|
|
host->data_shift = 2;
|
|
}
|
|
|
|
/* Reset all blocks */
|
|
if (!mci_wait_reset(host->dev, host))
|
|
return -ENODEV;
|
|
|
|
host->dma_ops = host->pdata->dma_ops;
|
|
dw_mci_init_dma(host);
|
|
|
|
/* Clear the interrupts for the host controller */
|
|
mci_writel(host, RINTSTS, 0xFFFFFFFF);
|
|
mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
|
|
|
|
/* Put in max timeout */
|
|
mci_writel(host, TMOUT, 0xFFFFFFFF);
|
|
|
|
/*
|
|
* FIFO threshold settings RxMark = fifo_size / 2 - 1,
|
|
* Tx Mark = fifo_size / 2 DMA Size = 8
|
|
*/
|
|
if (!host->pdata->fifo_depth) {
|
|
/*
|
|
* Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
|
|
* have been overwritten by the bootloader, just like we're
|
|
* about to do, so if you know the value for your hardware, you
|
|
* should put it in the platform data.
|
|
*/
|
|
fifo_size = mci_readl(host, FIFOTH);
|
|
fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
|
|
} else {
|
|
fifo_size = host->pdata->fifo_depth;
|
|
}
|
|
host->fifo_depth = fifo_size;
|
|
host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
|
|
((fifo_size/2) << 0));
|
|
mci_writel(host, FIFOTH, host->fifoth_val);
|
|
|
|
/* disable clock to CIU */
|
|
mci_writel(host, CLKENA, 0);
|
|
mci_writel(host, CLKSRC, 0);
|
|
|
|
/*
|
|
* In 2.40a spec, Data offset is changed.
|
|
* Need to check the version-id and set data-offset for DATA register.
|
|
*/
|
|
host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
|
|
dev_info(host->dev, "Version ID is %04x\n", host->verid);
|
|
|
|
if (host->verid < DW_MMC_240A)
|
|
host->data_offset = DATA_OFFSET;
|
|
else
|
|
host->data_offset = DATA_240A_OFFSET;
|
|
|
|
tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
|
|
host->card_workqueue = alloc_workqueue("dw-mci-card",
|
|
WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
|
|
if (!host->card_workqueue)
|
|
goto err_dmaunmap;
|
|
INIT_WORK(&host->card_work, dw_mci_work_routine_card);
|
|
ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
|
|
host->irq_flags, "dw-mci", host);
|
|
if (ret)
|
|
goto err_workqueue;
|
|
|
|
if (host->pdata->num_slots)
|
|
host->num_slots = host->pdata->num_slots;
|
|
else
|
|
host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
|
|
|
|
/*
|
|
* Enable interrupts for command done, data over, data empty, card det,
|
|
* receive ready and error such as transmit, receive timeout, crc error
|
|
*/
|
|
mci_writel(host, RINTSTS, 0xFFFFFFFF);
|
|
mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
|
|
SDMMC_INT_TXDR | SDMMC_INT_RXDR |
|
|
DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
|
|
mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
|
|
|
|
dev_info(host->dev, "DW MMC controller at irq %d, "
|
|
"%d bit host data width, "
|
|
"%u deep fifo\n",
|
|
host->irq, width, fifo_size);
|
|
|
|
/* We need at least one slot to succeed */
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
ret = dw_mci_init_slot(host, i);
|
|
if (ret)
|
|
dev_dbg(host->dev, "slot %d init failed\n", i);
|
|
else
|
|
init_slots++;
|
|
}
|
|
|
|
if (init_slots) {
|
|
dev_info(host->dev, "%d slots initialized\n", init_slots);
|
|
} else {
|
|
dev_dbg(host->dev, "attempted to initialize %d slots, "
|
|
"but failed on all\n", host->num_slots);
|
|
goto err_workqueue;
|
|
}
|
|
|
|
if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
|
|
dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
|
|
|
|
return 0;
|
|
|
|
err_workqueue:
|
|
destroy_workqueue(host->card_workqueue);
|
|
|
|
err_dmaunmap:
|
|
if (host->use_dma && host->dma_ops->exit)
|
|
host->dma_ops->exit(host);
|
|
|
|
if (host->vmmc)
|
|
regulator_disable(host->vmmc);
|
|
|
|
err_clk_ciu:
|
|
if (!IS_ERR(host->ciu_clk))
|
|
clk_disable_unprepare(host->ciu_clk);
|
|
|
|
err_clk_biu:
|
|
if (!IS_ERR(host->biu_clk))
|
|
clk_disable_unprepare(host->biu_clk);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dw_mci_probe);
|
|
|
|
void dw_mci_remove(struct dw_mci *host)
|
|
{
|
|
int i;
|
|
|
|
mci_writel(host, RINTSTS, 0xFFFFFFFF);
|
|
mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
|
|
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
dev_dbg(host->dev, "remove slot %d\n", i);
|
|
if (host->slot[i])
|
|
dw_mci_cleanup_slot(host->slot[i], i);
|
|
}
|
|
|
|
/* disable clock to CIU */
|
|
mci_writel(host, CLKENA, 0);
|
|
mci_writel(host, CLKSRC, 0);
|
|
|
|
destroy_workqueue(host->card_workqueue);
|
|
|
|
if (host->use_dma && host->dma_ops->exit)
|
|
host->dma_ops->exit(host);
|
|
|
|
if (host->vmmc)
|
|
regulator_disable(host->vmmc);
|
|
|
|
if (!IS_ERR(host->ciu_clk))
|
|
clk_disable_unprepare(host->ciu_clk);
|
|
|
|
if (!IS_ERR(host->biu_clk))
|
|
clk_disable_unprepare(host->biu_clk);
|
|
}
|
|
EXPORT_SYMBOL(dw_mci_remove);
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/*
|
|
* TODO: we should probably disable the clock to the card in the suspend path.
|
|
*/
|
|
int dw_mci_suspend(struct dw_mci *host)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
struct dw_mci_slot *slot = host->slot[i];
|
|
if (!slot)
|
|
continue;
|
|
ret = mmc_suspend_host(slot->mmc);
|
|
if (ret < 0) {
|
|
while (--i >= 0) {
|
|
slot = host->slot[i];
|
|
if (slot)
|
|
mmc_resume_host(host->slot[i]->mmc);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (host->vmmc)
|
|
regulator_disable(host->vmmc);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dw_mci_suspend);
|
|
|
|
int dw_mci_resume(struct dw_mci *host)
|
|
{
|
|
int i, ret;
|
|
|
|
if (host->vmmc) {
|
|
ret = regulator_enable(host->vmmc);
|
|
if (ret) {
|
|
dev_err(host->dev,
|
|
"failed to enable regulator: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (!mci_wait_reset(host->dev, host)) {
|
|
ret = -ENODEV;
|
|
return ret;
|
|
}
|
|
|
|
if (host->use_dma && host->dma_ops->init)
|
|
host->dma_ops->init(host);
|
|
|
|
/* Restore the old value at FIFOTH register */
|
|
mci_writel(host, FIFOTH, host->fifoth_val);
|
|
|
|
mci_writel(host, RINTSTS, 0xFFFFFFFF);
|
|
mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
|
|
SDMMC_INT_TXDR | SDMMC_INT_RXDR |
|
|
DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
|
|
mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
|
|
|
|
for (i = 0; i < host->num_slots; i++) {
|
|
struct dw_mci_slot *slot = host->slot[i];
|
|
if (!slot)
|
|
continue;
|
|
if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
|
|
dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
|
|
dw_mci_setup_bus(slot, true);
|
|
}
|
|
|
|
ret = mmc_resume_host(host->slot[i]->mmc);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dw_mci_resume);
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static int __init dw_mci_init(void)
|
|
{
|
|
printk(KERN_INFO "Synopsys Designware Multimedia Card Interface Driver");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit dw_mci_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(dw_mci_init);
|
|
module_exit(dw_mci_exit);
|
|
|
|
MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
|
|
MODULE_AUTHOR("NXP Semiconductor VietNam");
|
|
MODULE_AUTHOR("Imagination Technologies Ltd");
|
|
MODULE_LICENSE("GPL v2");
|