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>

6 files changed, 47 insertions, 81 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a9a1af49281e..38cb1d4d6843 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -60,15 +60,6 @@ config MFD_ASIC3
           This driver supports the ASIC3 multifunction chip found on many
           PDAs (mainly iPAQ and HTC based ones)
 
-config MFD_SH_MOBILE_SDHI
-        bool "Support for SuperH Mobile SDHI"
-        depends on SUPERH || ARCH_SHMOBILE
-        select MFD_CORE
-        select TMIO_MMC_DMA
-         ---help---
-          This driver supports the SDHI hardware block found in many
-          SuperH Mobile SoCs.
-
 config MFD_DAVINCI_VOICECODEC
         tristate
         select MFD_CORE
@@ -265,11 +256,6 @@ config MFD_TMIO
         bool
         default n
 
-config TMIO_MMC_DMA
-        bool
-        select DMA_ENGINE
-        select DMADEVICES
-
 config MFD_T7L66XB
         bool "Support Toshiba T7L66XB"
         depends on ARM && HAVE_CLK
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 47f5709f3828..ad6c44321873 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -6,7 +6,6 @@
 obj-$(CONFIG_MFD_88PM860X)      += 88pm860x.o
 obj-$(CONFIG_MFD_SM501)         += sm501.o
 obj-$(CONFIG_MFD_ASIC3)         += asic3.o tmio_core.o
-obj-$(CONFIG_MFD_SH_MOBILE_SDHI)                += sh_mobile_sdhi.o
 
 obj-$(CONFIG_HTC_EGPIO)         += htc-egpio.o
 obj-$(CONFIG_HTC_PASIC3)        += htc-pasic3.o
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 4d16166386ca..0b03cee91451 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -444,12 +444,19 @@ config MMC_TMIO_CORE
 
 config MMC_TMIO
         tristate "Toshiba Mobile IO Controller (TMIO) MMC/SD function support"
-        depends on MFD_TMIO || MFD_ASIC3 || MFD_SH_MOBILE_SDHI
+        depends on MFD_TMIO || MFD_ASIC3
         select MMC_TMIO_CORE
         help
           This provides support for the SD/MMC cell found in TC6393XB,
           T7L66XB and also HTC ASIC3
 
+config MMC_SDHI
+        tristate "SH-Mobile SDHI SD/SDIO controller support"
+        select MMC_TMIO_CORE
+        help
+          This provides support for the SDHI SD/SDIO controller found in
+          SuperH and ARM SH-Mobile SoCs
+
 config MMC_CB710
         tristate "ENE CB710 MMC/SD Interface support"
         depends on PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 79c42dd23c0e..4f1df0aae574 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -31,8 +31,11 @@ obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
 obj-$(CONFIG_MMC_TMIO)          += tmio_mmc.o
 obj-$(CONFIG_MMC_TMIO_CORE)     += tmio_mmc_core.o
 tmio_mmc_core-y                 := tmio_mmc_pio.o
-tmio_mmc_core-$(CONFIG_TMIO_MMC_DMA)    += tmio_mmc_dma.o
-obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
+ifneq ($(CONFIG_MMC_SDHI),n)
+tmio_mmc_core-y                 += tmio_mmc_dma.o
+endif
+obj-$(CONFIG_MMC_SDHI)          += sh_mobile_sdhi.o
+obj-$(CONFIG_MMC_CB710)         += cb710-mmc.o
 obj-$(CONFIG_MMC_VIA_SDMMC)     += via-sdmmc.o
 obj-$(CONFIG_SDH_BFIN)          += bfin_sdh.o
 obj-$(CONFIG_MMC_DW)            += dw_mmc.o
diff --git a/drivers/mfd/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 53a63024bf11..cc701236d16f 100644
--- a/drivers/mfd/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -23,51 +23,30 @@
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/mmc/host.h>
-#include <linux/mfd/core.h>
+#include <linux/mmc/sh_mobile_sdhi.h>
 #include <linux/mfd/tmio.h>
-#include <linux/mfd/sh_mobile_sdhi.h>
 #include <linux/sh_dma.h>
 
+#include "tmio_mmc.h"
+
 struct sh_mobile_sdhi {
         struct clk *clk;
         struct tmio_mmc_data mmc_data;
-        struct mfd_cell cell_mmc;
         struct sh_dmae_slave param_tx;
         struct sh_dmae_slave param_rx;
         struct tmio_mmc_dma dma_priv;
 };
 
-static struct resource sh_mobile_sdhi_resources[] = {
-        {
-                .start = 0x000,
-                .end   = 0x1ff,
-                .flags = IORESOURCE_MEM,
-        },
-        {
-                .start = 0,
-                .end   = 0,
-                .flags = IORESOURCE_IRQ,
-        },
-};
-
-static struct mfd_cell sh_mobile_sdhi_cell = {
-        .name          = "tmio-mmc",
-        .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
-        .resources     = sh_mobile_sdhi_resources,
-};
-
-static void sh_mobile_sdhi_set_pwr(struct platform_device *tmio, int state)
+static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
 {
-        struct platform_device *pdev = to_platform_device(tmio->dev.parent);
         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 *tmio)
+static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
 {
-        struct platform_device *pdev = to_platform_device(tmio->dev.parent);
         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 
         if (p && p->get_cd)
@@ -81,20 +60,9 @@ 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 resource *mem;
+        struct tmio_mmc_host *host;
         char clk_name[8];
-        int ret, irq;
-
-        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!mem)
-                dev_err(&pdev->dev, "missing MEM resource\n");
-
-        irq = platform_get_irq(pdev, 0);
-        if (irq < 0)
-                dev_err(&pdev->dev, "missing IRQ resource\n");
-
-        if (!mem || (irq < 0))
-                return -EINVAL;
+        int ret;
 
         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
         if (priv == NULL) {
@@ -109,8 +77,7 @@ static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
         if (IS_ERR(priv->clk)) {
                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
                 ret = PTR_ERR(priv->clk);
-                kfree(priv);
-                return ret;
+                goto eclkget;
         }
 
         clk_enable(priv->clk);
@@ -123,6 +90,15 @@ static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
                 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;
+                }
         }
 
         /*
@@ -136,36 +112,30 @@ static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
          */
         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 
-        if (p && 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;
-        }
+        ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
+        if (ret < 0)
+                goto eprobe;
 
-        memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
-        priv->cell_mmc.mfd_data = mmc_data;
+        pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
+                (unsigned long)host->ctl, host->irq);
 
-        platform_set_drvdata(pdev, priv);
-
-        ret = mfd_add_devices(&pdev->dev, pdev->id,
-                              &priv->cell_mmc, 1, mem, irq);
-        if (ret) {
-                clk_disable(priv->clk);
-                clk_put(priv->clk);
-                kfree(priv);
-        }
+        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 sh_mobile_sdhi *priv = platform_get_drvdata(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);
 
-        mfd_remove_devices(&pdev->dev);
+        tmio_mmc_host_remove(host);
         clk_disable(priv->clk);
         clk_put(priv->clk);
         kfree(priv);
@@ -198,3 +168,4 @@ 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");
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 8dedf0a69348..7d79b14d56aa 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -120,7 +120,7 @@ static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
         local_irq_restore(*flags);
 }
 
-#ifdef CONFIG_TMIO_MMC_DMA
+#if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
 void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
 void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
 void tmio_mmc_release_dma(struct tmio_mmc_host *host);