291 lines
6.9 KiB
C
291 lines
6.9 KiB
C
/*
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* SuperH Mobile SDHI
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*
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* Copyright (C) 2009 Magnus Damm
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Based on "Compaq ASIC3 support":
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*
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* Copyright 2001 Compaq Computer Corporation.
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* Copyright 2004-2005 Phil Blundell
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* Copyright 2007-2008 OpenedHand Ltd.
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*
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* Authors: Phil Blundell <pb@handhelds.org>,
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* Samuel Ortiz <sameo@openedhand.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/sh_mobile_sdhi.h>
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#include <linux/mfd/tmio.h>
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#include <linux/sh_dma.h>
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#include <linux/delay.h>
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#include "tmio_mmc.h"
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struct sh_mobile_sdhi {
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struct clk *clk;
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struct tmio_mmc_data mmc_data;
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struct sh_dmae_slave param_tx;
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struct sh_dmae_slave param_rx;
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struct tmio_mmc_dma dma_priv;
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};
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static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
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{
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struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
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if (p && p->set_pwr)
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p->set_pwr(pdev, state);
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}
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static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
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{
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struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
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if (p && p->get_cd)
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return p->get_cd(pdev);
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else
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return -ENOSYS;
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}
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static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
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{
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int timeout = 1000;
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while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
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udelay(1);
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if (!timeout) {
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dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
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return -EBUSY;
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}
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return 0;
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}
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static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
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{
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switch (addr)
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{
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case CTL_SD_CMD:
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case CTL_STOP_INTERNAL_ACTION:
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case CTL_XFER_BLK_COUNT:
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case CTL_SD_CARD_CLK_CTL:
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case CTL_SD_XFER_LEN:
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case CTL_SD_MEM_CARD_OPT:
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case CTL_TRANSACTION_CTL:
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case CTL_DMA_ENABLE:
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return sh_mobile_sdhi_wait_idle(host);
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}
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return 0;
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}
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static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
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{
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struct sh_mobile_sdhi *priv;
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struct tmio_mmc_data *mmc_data;
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struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
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struct tmio_mmc_host *host;
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char clk_name[8];
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int irq, ret, i = 0;
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bool multiplexed_isr = true;
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priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
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if (priv == NULL) {
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dev_err(&pdev->dev, "kzalloc failed\n");
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return -ENOMEM;
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}
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mmc_data = &priv->mmc_data;
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p->pdata = mmc_data;
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snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
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priv->clk = clk_get(&pdev->dev, clk_name);
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if (IS_ERR(priv->clk)) {
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dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
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ret = PTR_ERR(priv->clk);
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goto eclkget;
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}
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clk_enable(priv->clk);
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mmc_data->hclk = clk_get_rate(priv->clk);
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mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
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mmc_data->get_cd = sh_mobile_sdhi_get_cd;
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mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
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if (p) {
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mmc_data->flags = p->tmio_flags;
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if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
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mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
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mmc_data->ocr_mask = p->tmio_ocr_mask;
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mmc_data->capabilities |= p->tmio_caps;
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if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
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priv->param_tx.slave_id = p->dma_slave_tx;
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priv->param_rx.slave_id = p->dma_slave_rx;
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priv->dma_priv.chan_priv_tx = &priv->param_tx;
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priv->dma_priv.chan_priv_rx = &priv->param_rx;
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priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
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mmc_data->dma = &priv->dma_priv;
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}
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}
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/*
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* All SDHI blocks support 2-byte and larger block sizes in 4-bit
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* bus width mode.
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*/
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mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
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/*
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* All SDHI blocks support SDIO IRQ signalling.
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*/
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mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
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ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
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if (ret < 0)
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goto eprobe;
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/*
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* Allow one or more specific (named) ISRs or
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* one or more multiplexed (un-named) ISRs.
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*/
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irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
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if (irq >= 0) {
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multiplexed_isr = false;
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ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
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dev_name(&pdev->dev), host);
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if (ret)
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goto eirq_card_detect;
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}
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irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
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if (irq >= 0) {
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multiplexed_isr = false;
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ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
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dev_name(&pdev->dev), host);
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if (ret)
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goto eirq_sdio;
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}
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irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
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if (irq >= 0) {
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multiplexed_isr = false;
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ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
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dev_name(&pdev->dev), host);
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if (ret)
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goto eirq_sdcard;
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} else if (!multiplexed_isr) {
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dev_err(&pdev->dev,
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"Principal SD-card IRQ is missing among named interrupts\n");
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ret = irq;
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goto eirq_sdcard;
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}
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if (multiplexed_isr) {
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while (1) {
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irq = platform_get_irq(pdev, i);
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if (irq < 0)
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break;
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i++;
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ret = request_irq(irq, tmio_mmc_irq, 0,
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dev_name(&pdev->dev), host);
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if (ret)
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goto eirq_multiplexed;
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}
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/* There must be at least one IRQ source */
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if (!i)
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goto eirq_multiplexed;
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}
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dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
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mmc_hostname(host->mmc), (unsigned long)
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(platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
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mmc_data->hclk / 1000000);
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return ret;
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eirq_multiplexed:
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while (i--) {
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irq = platform_get_irq(pdev, i);
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free_irq(irq, host);
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}
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eirq_sdcard:
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irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
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if (irq >= 0)
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free_irq(irq, host);
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eirq_sdio:
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irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
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if (irq >= 0)
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free_irq(irq, host);
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eirq_card_detect:
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tmio_mmc_host_remove(host);
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eprobe:
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clk_disable(priv->clk);
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clk_put(priv->clk);
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eclkget:
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kfree(priv);
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return ret;
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}
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static int sh_mobile_sdhi_remove(struct platform_device *pdev)
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{
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struct mmc_host *mmc = platform_get_drvdata(pdev);
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struct tmio_mmc_host *host = mmc_priv(mmc);
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struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
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struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
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int i = 0, irq;
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p->pdata = NULL;
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tmio_mmc_host_remove(host);
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while (1) {
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irq = platform_get_irq(pdev, i++);
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if (irq < 0)
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break;
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free_irq(irq, host);
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}
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clk_disable(priv->clk);
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clk_put(priv->clk);
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kfree(priv);
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return 0;
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}
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static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
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.suspend = tmio_mmc_host_suspend,
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.resume = tmio_mmc_host_resume,
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.runtime_suspend = tmio_mmc_host_runtime_suspend,
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.runtime_resume = tmio_mmc_host_runtime_resume,
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};
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static struct platform_driver sh_mobile_sdhi_driver = {
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.driver = {
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.name = "sh_mobile_sdhi",
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.owner = THIS_MODULE,
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.pm = &tmio_mmc_dev_pm_ops,
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},
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.probe = sh_mobile_sdhi_probe,
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.remove = __devexit_p(sh_mobile_sdhi_remove),
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};
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module_platform_driver(sh_mobile_sdhi_driver);
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MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
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MODULE_AUTHOR("Magnus Damm");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:sh_mobile_sdhi");
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