diff options
author | Magnus Damm <damm@opensource.se> | 2009-10-02 02:22:09 +0000 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2009-10-26 10:37:04 +0900 |
commit | a87d563873a6f1ee98233b57af665f2d0fc90ebb (patch) | |
tree | e1db323f310adc244d0750ff24698b0ed33db493 /drivers/mfd/sh_mobile_sdhi.c | |
parent | 374576a8b6f865022c0fd1ca62396889b23d66dd (diff) | |
download | kernel_samsung_smdk4412-a87d563873a6f1ee98233b57af665f2d0fc90ebb.zip kernel_samsung_smdk4412-a87d563873a6f1ee98233b57af665f2d0fc90ebb.tar.gz kernel_samsung_smdk4412-a87d563873a6f1ee98233b57af665f2d0fc90ebb.tar.bz2 |
mfd: Add SuperH Mobile SDHI platform driver
This patch adds an MFD driver for the SuperH Mobile SDHI
hardware block. At this point the driver simply wraps the
tmio-mmc driver with some clock code. In the future this
driver is the place to put SDHI specific hotplug code.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/mfd/sh_mobile_sdhi.c')
-rw-r--r-- | drivers/mfd/sh_mobile_sdhi.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/mfd/sh_mobile_sdhi.c b/drivers/mfd/sh_mobile_sdhi.c new file mode 100644 index 0000000..56f72cc --- /dev/null +++ b/drivers/mfd/sh_mobile_sdhi.c @@ -0,0 +1,145 @@ +/* + * 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/platform_device.h> + +#include <linux/mfd/core.h> +#include <linux/mfd/tmio.h> + +struct sh_mobile_sdhi { + struct clk *clk; + struct tmio_mmc_data mmc_data; + struct mfd_cell cell_mmc; +}; + +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 int __init sh_mobile_sdhi_probe(struct platform_device *pdev) +{ + struct sh_mobile_sdhi *priv; + struct resource *mem; + 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; + + priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL); + if (priv == NULL) { + dev_err(&pdev->dev, "kzalloc failed\n"); + return -ENOMEM; + } + + 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); + kfree(priv); + return ret; + } + + clk_enable(priv->clk); + + /* FIXME: silly const unsigned int hclk */ + *(unsigned int *)&priv->mmc_data.hclk = clk_get_rate(priv->clk); + + memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc)); + priv->cell_mmc.driver_data = &priv->mmc_data; + priv->cell_mmc.platform_data = &priv->cell_mmc; + priv->cell_mmc.data_size = sizeof(priv->cell_mmc); + + 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; +} + +static int sh_mobile_sdhi_remove(struct platform_device *pdev) +{ + struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev); + + mfd_remove_devices(&pdev->dev); + 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"); |