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Commit 03b1781aa978aab345b5a85d8596f8615281ba89

Authored by Vinayak Holikatti 2013-02-26 20:34:45 +0800

Committed by James Bottomley 2013-05-03 07:16:50 +0800

Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches

[SCSI] ufs: Add Platform glue driver for ufshcd

This patch adds Platform glue driver for ufshcd.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Tested-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Vinayak Holikatti <vinholikatti@gmail.com>
Signed-off-by: Santosh Yaraganavi <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

Showing 3 changed files with 229 additions and 0 deletions Inline Diff

drivers/scsi/ufs/Kconfig
drivers/scsi/ufs/Makefile
drivers/scsi/ufs/ufshcd-pltfrm.c

drivers/scsi/ufs/Kconfig

Diff comments View file @ 03b1781

 #
 # Kernel configuration file for the UFS Host Controller
 #
 # This code is based on drivers/scsi/ufs/Kconfig
 # Copyright (C) 2011-2013 Samsung India Software Operations
 #
 # Authors:
 #	Santosh Yaraganavi <santosh.sy@samsung.com>
 #	Vinayak Holikatti <h.vinayak@samsung.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
 # as published by the Free Software Foundation; either version 2
 # of the License, or (at your option) any later version.
 # See the COPYING file in the top-level directory or visit
 # <http://www.gnu.org/licenses/gpl-2.0.html>
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # This program is provided "AS IS" and "WITH ALL FAULTS" and
 # without warranty of any kind. You are solely responsible for
 # determining the appropriateness of using and distributing
 # the program and assume all risks associated with your exercise
 # of rights with respect to the program, including but not limited
 # to infringement of third party rights, the risks and costs of
 # program errors, damage to or loss of data, programs or equipment,
 # and unavailability or interruption of operations. Under no
 # circumstances will the contributor of this Program be liable for
 # any damages of any kind arising from your use or distribution of
 # this program.
 config SCSI_UFSHCD
 	tristate "Universal Flash Storage Controller Driver Core"
 	depends on SCSI
 	---help---
 	This selects the support for UFS devices in Linux, say Y and make
 	  sure that you know the name of your UFS host adapter (the card
 	  inside your computer that "speaks" the UFS protocol, also
 	  called UFS Host Controller), because you will be asked for it.
 	  The module will be called ufshcd.
 	  To compile this driver as a module, choose M here and read
 	  <file:Documentation/scsi/ufs.txt>.
 	  However, do not compile this as a module if your root file system
 	  (the one containing the directory /) is located on a UFS device.
 config SCSI_UFSHCD_PCI
 	tristate "PCI bus based UFS Controller support"
 	depends on SCSI_UFSHCD && PCI
 	---help---
 	This selects the PCI UFS Host Controller Interface. Select this if
 	you have UFS Host Controller with PCI Interface.
 	  If you have a controller with this interface, say Y or M here.
 	  If unsure, say N.
+config SCSI_UFSHCD_PLATFORM
+	tristate "Platform bus based UFS Controller support"
+	depends on SCSI_UFSHCD
+	---help---
+	This selects the UFS host controller support. Select this if
+	you have an UFS controller on Platform bus.
+	If you have a controller with this interface, say Y or M here.
+	  If unsure, say N.

drivers/scsi/ufs/Makefile

Diff comments View file @ 03b1781

1	# UFSHCD makefile	1	# UFSHCD makefile
2	obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o	2	obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
3	obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o	3	obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
		4	obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
4		5

drivers/scsi/ufs/ufshcd-pltfrm.c

Diff comments View file @ 03b1781

File was created	1	/*
	2	* Universal Flash Storage Host controller Platform bus based glue driver
	3	*
	4	* This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
	5	* Copyright (C) 2011-2013 Samsung India Software Operations
	6	*
	7	* Authors:
	8	* Santosh Yaraganavi <santosh.sy@samsung.com>
	9	* Vinayak Holikatti <h.vinayak@samsung.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version 2
	14	* of the License, or (at your option) any later version.
	15	* See the COPYING file in the top-level directory or visit
	16	* <http://www.gnu.org/licenses/gpl-2.0.html>
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* This program is provided "AS IS" and "WITH ALL FAULTS" and
	24	* without warranty of any kind. You are solely responsible for
	25	* determining the appropriateness of using and distributing
	26	* the program and assume all risks associated with your exercise
	27	* of rights with respect to the program, including but not limited
	28	* to infringement of third party rights, the risks and costs of
	29	* program errors, damage to or loss of data, programs or equipment,
	30	* and unavailability or interruption of operations. Under no
	31	* circumstances will the contributor of this Program be liable for
	32	* any damages of any kind arising from your use or distribution of
	33	* this program.
	34	*/
	35
	36	#include "ufshcd.h"
	37	#include <linux/platform_device.h>
	38
	39	#ifdef CONFIG_PM
	40	/**
	41	* ufshcd_pltfrm_suspend - suspend power management function
	42	* @dev: pointer to device handle
	43	*
	44	*
	45	* Returns 0
	46	*/
	47	static int ufshcd_pltfrm_suspend(struct device *dev)
	48	{
	49	struct platform_device *pdev = to_platform_device(dev);
	50	struct ufs_hba *hba = platform_get_drvdata(pdev);
	51
	52	/*
	53	* TODO:
	54	* 1. Call ufshcd_suspend
	55	* 2. Do bus specific power management
	56	*/
	57
	58	disable_irq(hba->irq);
	59
	60	return 0;
	61	}
	62
	63	/**
	64	* ufshcd_pltfrm_resume - resume power management function
	65	* @dev: pointer to device handle
	66	*
	67	* Returns 0
	68	*/
	69	static int ufshcd_pltfrm_resume(struct device *dev)
	70	{
	71	struct platform_device *pdev = to_platform_device(dev);
	72	struct ufs_hba *hba = platform_get_drvdata(pdev);
	73
	74	/*
	75	* TODO:
	76	* 1. Call ufshcd_resume.
	77	* 2. Do bus specific wake up
	78	*/
	79
	80	enable_irq(hba->irq);
	81
	82	return 0;
	83	}
	84	#else
	85	#define ufshcd_pltfrm_suspend NULL
	86	#define ufshcd_pltfrm_resume NULL
	87	#endif
	88
	89	/**
	90	* ufshcd_pltfrm_probe - probe routine of the driver
	91	* @pdev: pointer to Platform device handle
	92	*
	93	* Returns 0 on success, non-zero value on failure
	94	*/
	95	static int ufshcd_pltfrm_probe(struct platform_device *pdev)
	96	{
	97	struct ufs_hba *hba;
	98	void __iomem *mmio_base;
	99	struct resource *mem_res;
	100	struct resource *irq_res;
	101	resource_size_t mem_size;
	102	int err;
	103	struct device *dev = &pdev->dev;
	104
	105	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	106	if (!mem_res) {
	107	dev_err(&pdev->dev,
	108	"Memory resource not available\n");
	109	err = -ENODEV;
	110	goto out_error;
	111	}
	112
	113	mem_size = resource_size(mem_res);
	114	if (!request_mem_region(mem_res->start, mem_size, "ufshcd")) {
	115	dev_err(&pdev->dev,
	116	"Cannot reserve the memory resource\n");
	117	err = -EBUSY;
	118	goto out_error;
	119	}
	120
	121	mmio_base = ioremap_nocache(mem_res->start, mem_size);
	122	if (!mmio_base) {
	123	dev_err(&pdev->dev, "memory map failed\n");
	124	err = -ENOMEM;
	125	goto out_release_regions;
	126	}
	127
	128	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	129	if (!irq_res) {
	130	dev_err(&pdev->dev, "IRQ resource not available\n");
	131	err = -ENODEV;
	132	goto out_iounmap;
	133	}
	134
	135	err = dma_set_coherent_mask(dev, dev->coherent_dma_mask);
	136	if (err) {
	137	dev_err(&pdev->dev, "set dma mask failed\n");
	138	goto out_iounmap;
	139	}
	140
	141	err = ufshcd_init(&pdev->dev, &hba, mmio_base, irq_res->start);
	142	if (err) {
	143	dev_err(&pdev->dev, "Intialization failed\n");
	144	goto out_iounmap;
	145	}
	146
	147	platform_set_drvdata(pdev, hba);
	148
	149	return 0;
	150
	151	out_iounmap:
	152	iounmap(mmio_base);
	153	out_release_regions:
	154	release_mem_region(mem_res->start, mem_size);
	155	out_error:
	156	return err;
	157	}
	158
	159	/**
	160	* ufshcd_pltfrm_remove - remove platform driver routine
	161	* @pdev: pointer to platform device handle
	162	*
	163	* Returns 0 on success, non-zero value on failure
	164	*/
	165	static int ufshcd_pltfrm_remove(struct platform_device *pdev)
	166	{
	167	struct resource *mem_res;
	168	resource_size_t mem_size;
	169	struct ufs_hba *hba = platform_get_drvdata(pdev);
	170
	171	disable_irq(hba->irq);
	172
	173	/* Some buggy controllers raise interrupt after
	174	* the resources are removed. So first we unregister the
	175	* irq handler and then the resources used by driver
	176	*/
	177
	178	free_irq(hba->irq, hba);
	179	ufshcd_remove(hba);
	180	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	181	if (!mem_res)
	182	dev_err(&pdev->dev, "ufshcd: Memory resource not available\n");
	183	else {
	184	mem_size = resource_size(mem_res);
	185	release_mem_region(mem_res->start, mem_size);
	186	}
	187	platform_set_drvdata(pdev, NULL);
	188	return 0;
	189	}
	190
	191	static const struct of_device_id ufs_of_match[] = {
	192	{ .compatible = "jedec,ufs-1.1"},
	193	};
	194
	195	static const struct dev_pm_ops ufshcd_dev_pm_ops = {
	196	.suspend = ufshcd_pltfrm_suspend,
	197	.resume = ufshcd_pltfrm_resume,
	198	};
	199
	200	static struct platform_driver ufshcd_pltfrm_driver = {
	201	.probe = ufshcd_pltfrm_probe,
	202	.remove = ufshcd_pltfrm_remove,
	203	.driver = {
	204	.name = "ufshcd",
	205	.owner = THIS_MODULE,
	206	.pm = &ufshcd_dev_pm_ops,
	207	.of_match_table = ufs_of_match,
	208	},
	209	};
	210
	211	module_platform_driver(ufshcd_pltfrm_driver);
	212
	213	MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
	214	MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
	215	MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
	216	MODULE_LICENSE("GPL");
	217	MODULE_VERSION(UFSHCD_DRIVER_VERSION);
	218