mmc: tmio: convert the SDHI MMC driver from MFD to a platform driver

On sh-mobile platforms the SDHI driver was using the tmio_mmc SD/SDIO
MFD cell driver. Now that the tmio_mmc driver has been split into a
core and a separate MFD glue, we can support SDHI natively without the
need to emulate an MFD controller. This also allows to support systems
with an on-SoC SDHI controller and a separate MFD with a TMIO core.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
new file mode 100644
index 000000000000..cc701236d16f
--- /dev/null
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -0,0 +1,171 @@
+/*
+ * SuperH Mobile SDHI
+ *
+ * Copyright (C) 2009 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on "Compaq ASIC3 support":
+ *
+ * Copyright 2001 Compaq Computer Corporation.
+ * Copyright 2004-2005 Phil Blundell
+ * Copyright 2007-2008 OpenedHand Ltd.
+ *
+ * Authors: Phil Blundell <pb@handhelds.org>,
+ *          Samuel Ortiz <sameo@openedhand.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sh_mobile_sdhi.h>
+#include <linux/mfd/tmio.h>
+#include <linux/sh_dma.h>
+
+#include "tmio_mmc.h"
+
+struct sh_mobile_sdhi {
+        struct clk *clk;
+        struct tmio_mmc_data mmc_data;
+        struct sh_dmae_slave param_tx;
+        struct sh_dmae_slave param_rx;
+        struct tmio_mmc_dma dma_priv;
+};
+
+static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
+{
+        struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
+
+        if (p && p->set_pwr)
+                p->set_pwr(pdev, state);
+}
+
+static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
+{
+        struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
+
+        if (p && p->get_cd)
+                return p->get_cd(pdev);
+        else
+                return -ENOSYS;
+}
+
+static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
+{
+        struct sh_mobile_sdhi *priv;
+        struct tmio_mmc_data *mmc_data;
+        struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
+        struct tmio_mmc_host *host;
+        char clk_name[8];
+        int ret;
+
+        priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
+        if (priv == NULL) {
+                dev_err(&pdev->dev, "kzalloc failed\n");
+                return -ENOMEM;
+        }
+
+        mmc_data = &priv->mmc_data;
+
+        snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
+        priv->clk = clk_get(&pdev->dev, clk_name);
+        if (IS_ERR(priv->clk)) {
+                dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
+                ret = PTR_ERR(priv->clk);
+                goto eclkget;
+        }
+
+        clk_enable(priv->clk);
+
+        mmc_data->hclk = clk_get_rate(priv->clk);
+        mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
+        mmc_data->get_cd = sh_mobile_sdhi_get_cd;
+        mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
+        if (p) {
+                mmc_data->flags = p->tmio_flags;
+                mmc_data->ocr_mask = p->tmio_ocr_mask;
+                mmc_data->capabilities |= p->tmio_caps;
+
+                if (p->dma_slave_tx >= 0 && p->dma_slave_rx >= 0) {
+                        priv->param_tx.slave_id = p->dma_slave_tx;
+                        priv->param_rx.slave_id = p->dma_slave_rx;
+                        priv->dma_priv.chan_priv_tx = &priv->param_tx;
+                        priv->dma_priv.chan_priv_rx = &priv->param_rx;
+                        priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
+                        mmc_data->dma = &priv->dma_priv;
+                }
+        }
+
+        /*
+         * All SDHI blocks support 2-byte and larger block sizes in 4-bit
+         * bus width mode.
+         */
+        mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
+
+        /*
+         * All SDHI blocks support SDIO IRQ signalling.
+         */
+        mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
+
+        ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
+        if (ret < 0)
+                goto eprobe;
+
+        pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
+                (unsigned long)host->ctl, host->irq);
+
+        return ret;
+
+eprobe:
+        clk_disable(priv->clk);
+        clk_put(priv->clk);
+eclkget:
+        kfree(priv);
+        return ret;
+}
+
+static int sh_mobile_sdhi_remove(struct platform_device *pdev)
+{
+        struct mmc_host *mmc = platform_get_drvdata(pdev);
+        struct tmio_mmc_host *host = mmc_priv(mmc);
+        struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
+
+        tmio_mmc_host_remove(host);
+        clk_disable(priv->clk);
+        clk_put(priv->clk);
+        kfree(priv);
+
+        return 0;
+}
+
+static struct platform_driver sh_mobile_sdhi_driver = {
+        .driver         = {
+                .name   = "sh_mobile_sdhi",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = sh_mobile_sdhi_probe,
+        .remove         = __devexit_p(sh_mobile_sdhi_remove),
+};
+
+static int __init sh_mobile_sdhi_init(void)
+{
+        return platform_driver_register(&sh_mobile_sdhi_driver);
+}
+
+static void __exit sh_mobile_sdhi_exit(void)
+{
+        platform_driver_unregister(&sh_mobile_sdhi_driver);
+}
+
+module_init(sh_mobile_sdhi_init);
+module_exit(sh_mobile_sdhi_exit);
+
+MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
+MODULE_AUTHOR("Magnus Damm");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sh_mobile_sdhi");