[deliverable/linux.git] / arch / arm / mach-omap2 / dma.c

/*
 * OMAP2+ DMA driver
 *
 * Copyright (C) 2003 - 2008 Nokia Corporation
 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
 * Graphics DMA and LCD DMA graphics tranformations
 * by Imre Deak <imre.deak@nokia.com>
 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
 *
 * Copyright (C) 2009 Texas Instruments
 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
 * Converted DMA library into platform driver
 *	- G, Manjunath Kondaiah <manjugk@ti.com>
 *
 * 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.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/omap-dma.h>

#include "soc.h"
#include "omap_hwmod.h"
#include "omap_device.h"

#define OMAP2_DMA_STRIDE	0x60

static u32 errata;

static struct omap_dma_dev_attr *d;

static enum omap_reg_offsets dma_common_ch_end;

static u16 reg_map[] = {
	[REVISION]		= 0x00,
	[GCR]			= 0x78,
	[IRQSTATUS_L0]		= 0x08,
	[IRQSTATUS_L1]		= 0x0c,
	[IRQSTATUS_L2]		= 0x10,
	[IRQSTATUS_L3]		= 0x14,
	[IRQENABLE_L0]		= 0x18,
	[IRQENABLE_L1]		= 0x1c,
	[IRQENABLE_L2]		= 0x20,
	[IRQENABLE_L3]		= 0x24,
	[SYSSTATUS]		= 0x28,
	[OCP_SYSCONFIG]		= 0x2c,
	[CAPS_0]		= 0x64,
	[CAPS_2]		= 0x6c,
	[CAPS_3]		= 0x70,
	[CAPS_4]		= 0x74,

	/* Common register offsets */
	[CCR]			= 0x80,
	[CLNK_CTRL]		= 0x84,
	[CICR]			= 0x88,
	[CSR]			= 0x8c,
	[CSDP]			= 0x90,
	[CEN]			= 0x94,
	[CFN]			= 0x98,
	[CSEI]			= 0xa4,
	[CSFI]			= 0xa8,
	[CDEI]			= 0xac,
	[CDFI]			= 0xb0,
	[CSAC]			= 0xb4,
	[CDAC]			= 0xb8,

	/* Channel specific register offsets */
	[CSSA]			= 0x9c,
	[CDSA]			= 0xa0,
	[CCEN]			= 0xbc,
	[CCFN]			= 0xc0,
	[COLOR]			= 0xc4,

	/* OMAP4 specific registers */
	[CDP]			= 0xd0,
	[CNDP]			= 0xd4,
	[CCDN]			= 0xd8,
};

static void __iomem *dma_base;
static inline void dma_write(u32 val, int reg, int lch)
{
	u8  stride;
	u32 offset;

	stride = (reg >= CSDP) ? OMAP2_DMA_STRIDE : 0;
	offset = reg_map[reg] + (stride * lch);
	__raw_writel(val, dma_base + offset);
}

static inline u32 dma_read(int reg, int lch)
{
	u8 stride;
	u32 offset, val;

	stride = (reg >= CSDP) ? OMAP2_DMA_STRIDE : 0;
	offset = reg_map[reg] + (stride * lch);
	val = __raw_readl(dma_base + offset);
	return val;
}

static void omap2_clear_dma(int lch)
{
	int i;

	for (i = CSDP; i <= dma_common_ch_end; i += 1)
		dma_write(0, i, lch);
}

static void omap2_show_dma_caps(void)
{
	u8 revision = dma_read(REVISION, 0) & 0xff;
	printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
				revision >> 4, revision & 0xf);
	return;
}

static u32 configure_dma_errata(void)
{

	/*
	 * Errata applicable for OMAP2430ES1.0 and all omap2420
	 *
	 * I.
	 * Erratum ID: Not Available
	 * Inter Frame DMA buffering issue DMA will wrongly
	 * buffer elements if packing and bursting is enabled. This might
	 * result in data gets stalled in FIFO at the end of the block.
	 * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
	 * guarantee no data will stay in the DMA FIFO in case inter frame
	 * buffering occurs
	 *
	 * II.
	 * Erratum ID: Not Available
	 * DMA may hang when several channels are used in parallel
	 * In the following configuration, DMA channel hanging can occur:
	 * a. Channel i, hardware synchronized, is enabled
	 * b. Another channel (Channel x), software synchronized, is enabled.
	 * c. Channel i is disabled before end of transfer
	 * d. Channel i is reenabled.
	 * e. Steps 1 to 4 are repeated a certain number of times.
	 * f. A third channel (Channel y), software synchronized, is enabled.
	 * Channel x and Channel y may hang immediately after step 'f'.
	 * Workaround:
	 * For any channel used - make sure NextLCH_ID is set to the value j.
	 */
	if (cpu_is_omap2420() || (cpu_is_omap2430() &&
				(omap_type() == OMAP2430_REV_ES1_0))) {

		SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
		SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
	}

	/*
	 * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
	 * after a transaction error.
	 * Workaround: SW should explicitely disable the channel.
	 */
	if (cpu_class_is_omap2())
		SET_DMA_ERRATA(DMA_ERRATA_i378);

	/*
	 * Erratum ID: i541: sDMA FIFO draining does not finish
	 * If sDMA channel is disabled on the fly, sDMA enters standby even
	 * through FIFO Drain is still in progress
	 * Workaround: Put sDMA in NoStandby more before a logical channel is
	 * disabled, then put it back to SmartStandby right after the channel
	 * finishes FIFO draining.
	 */
	if (cpu_is_omap34xx())
		SET_DMA_ERRATA(DMA_ERRATA_i541);

	/*
	 * Erratum ID: i88 : Special programming model needed to disable DMA
	 * before end of block.
	 * Workaround: software must ensure that the DMA is configured in No
	 * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
	 */
	if (omap_type() == OMAP3430_REV_ES1_0)
		SET_DMA_ERRATA(DMA_ERRATA_i88);

	/*
	 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
	 * read before the DMA controller finished disabling the channel.
	 */
	SET_DMA_ERRATA(DMA_ERRATA_3_3);

	/*
	 * Erratum ID: Not Available
	 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
	 * after secure sram context save and restore.
	 * Work around: Hence we need to manually clear those IRQs to avoid
	 * spurious interrupts. This affects only secure devices.
	 */
	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
		SET_DMA_ERRATA(DMA_ROMCODE_BUG);

	return errata;
}

/* One time initializations */
static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *unused)
{
	struct platform_device			*pdev;
	struct omap_system_dma_plat_info	*p;
	struct resource				*mem;
	char					*name = "omap_dma_system";

	p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
	if (!p) {
		pr_err("%s: Unable to allocate pdata for %s:%s\n",
			__func__, name, oh->name);
		return -ENOMEM;
	}

	p->dma_attr		= (struct omap_dma_dev_attr *)oh->dev_attr;
	p->show_dma_caps	= omap2_show_dma_caps;
	p->clear_dma		= omap2_clear_dma;
	p->dma_write		= dma_write;
	p->dma_read		= dma_read;

	p->clear_lch_regs	= NULL;

	p->errata		= configure_dma_errata();

	pdev = omap_device_build(name, 0, oh, p, sizeof(*p));
	kfree(p);
	if (IS_ERR(pdev)) {
		pr_err("%s: Can't build omap_device for %s:%s.\n",
			__func__, name, oh->name);
		return PTR_ERR(pdev);
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
		return -EINVAL;
	}
	dma_base = ioremap(mem->start, resource_size(mem));
	if (!dma_base) {
		dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
		return -ENOMEM;
	}

	d = oh->dev_attr;
	d->chan = kzalloc(sizeof(struct omap_dma_lch) *
					(d->lch_count), GFP_KERNEL);

	if (!d->chan) {
		dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__);
		return -ENOMEM;
	}

	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
		d->dev_caps |= HS_CHANNELS_RESERVED;

	/* Check the capabilities register for descriptor loading feature */
	if (dma_read(CAPS_0, 0) & DMA_HAS_DESCRIPTOR_CAPS)
		dma_common_ch_end = CCDN;
	else
		dma_common_ch_end = CCFN;

	return 0;
}

static const struct platform_device_info omap_dma_dev_info = {
	.name = "omap-dma-engine",
	.id = -1,
	.dma_mask = DMA_BIT_MASK(32),
};

static int __init omap2_system_dma_init(void)
{
	struct platform_device *pdev;
	int res;

	res = omap_hwmod_for_each_by_class("dma",
			omap2_system_dma_init_dev, NULL);
	if (res)
		return res;

	if (of_have_populated_dt())
		return res;

	pdev = platform_device_register_full(&omap_dma_dev_info);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	return res;
}
omap_arch_initcall(omap2_system_dma_init);
Commit	Line	Data
59de3cf1 MK	1	/*
	2	* OMAP2+ DMA driver
	3	*
	4	* Copyright (C) 2003 - 2008 Nokia Corporation
	5	* Author: Juha Yrjölä <juha.yrjola@nokia.com>
	6	* DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
	7	* Graphics DMA and LCD DMA graphics tranformations
	8	* by Imre Deak <imre.deak@nokia.com>
	9	* OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
	10	* Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
	11	*
	12	* Copyright (C) 2009 Texas Instruments
	13	* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
	14	*
	15	* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
	16	* Converted DMA library into platform driver
	17	* - G, Manjunath Kondaiah <manjugk@ti.com>
	18	*
	19	* This program is free software; you can redistribute it and/or modify
	20	* it under the terms of the GNU General Public License version 2 as
	21	* published by the Free Software Foundation.
	22	*/
	23
	24	#include <linux/err.h>
	25	#include <linux/io.h>
	26	#include <linux/slab.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/device.h>
be1f9481	30	#include <linux/dma-mapping.h>
8d30662a	31	#include <linux/of.h>
45c3eb7d	32	#include <linux/omap-dma.h>
59de3cf1	33
e4c060db	34	#include "soc.h"
2a296c8f	35	#include "omap_hwmod.h"
25c7d49e TL	36	#include "omap_device.h"
25c7d49e TL	37
f31cc962 MK	38	#define OMAP2_DMA_STRIDE 0x60
	39
	40	static u32 errata;
f31cc962 MK	41
	42	static struct omap_dma_dev_attr *d;
	43
ad0c381a	44	static enum omap_reg_offsets dma_common_ch_end;
f31cc962 MK	45
	46	static u16 reg_map[] = {
	47	[REVISION] = 0x00,
	48	[GCR] = 0x78,
	49	[IRQSTATUS_L0] = 0x08,
	50	[IRQSTATUS_L1] = 0x0c,
	51	[IRQSTATUS_L2] = 0x10,
	52	[IRQSTATUS_L3] = 0x14,
	53	[IRQENABLE_L0] = 0x18,
	54	[IRQENABLE_L1] = 0x1c,
	55	[IRQENABLE_L2] = 0x20,
	56	[IRQENABLE_L3] = 0x24,
	57	[SYSSTATUS] = 0x28,
	58	[OCP_SYSCONFIG] = 0x2c,
	59	[CAPS_0] = 0x64,
	60	[CAPS_2] = 0x6c,
	61	[CAPS_3] = 0x70,
	62	[CAPS_4] = 0x74,
	63
	64	/* Common register offsets */
	65	[CCR] = 0x80,
	66	[CLNK_CTRL] = 0x84,
	67	[CICR] = 0x88,
	68	[CSR] = 0x8c,
	69	[CSDP] = 0x90,
	70	[CEN] = 0x94,
	71	[CFN] = 0x98,
	72	[CSEI] = 0xa4,
	73	[CSFI] = 0xa8,
	74	[CDEI] = 0xac,
	75	[CDFI] = 0xb0,
	76	[CSAC] = 0xb4,
	77	[CDAC] = 0xb8,
	78
	79	/* Channel specific register offsets */
	80	[CSSA] = 0x9c,
	81	[CDSA] = 0xa0,
	82	[CCEN] = 0xbc,
	83	[CCFN] = 0xc0,
	84	[COLOR] = 0xc4,
	85
	86	/* OMAP4 specific registers */
	87	[CDP] = 0xd0,
	88	[CNDP] = 0xd4,
	89	[CCDN] = 0xd8,
	90	};
	91
f31cc962 MK	92	static void __iomem *dma_base;
	93	static inline void dma_write(u32 val, int reg, int lch)
	94	{
	95	u8 stride;
	96	u32 offset;
	97
ad0c381a	98	stride = (reg >= CSDP) ? OMAP2_DMA_STRIDE : 0;
f31cc962 MK	99	offset = reg_map[reg] + (stride * lch);
	100	__raw_writel(val, dma_base + offset);
	101	}
	102
	103	static inline u32 dma_read(int reg, int lch)
	104	{
	105	u8 stride;
	106	u32 offset, val;
	107
ad0c381a	108	stride = (reg >= CSDP) ? OMAP2_DMA_STRIDE : 0;
f31cc962 MK	109	offset = reg_map[reg] + (stride * lch);
	110	val = __raw_readl(dma_base + offset);
	111	return val;
	112	}
	113
f31cc962 MK	114	static void omap2_clear_dma(int lch)
f31cc962 MK	115	{
ad0c381a	116	int i;
f31cc962	117
ad0c381a	118	for (i = CSDP; i <= dma_common_ch_end; i += 1)
f31cc962 MK	119	dma_write(0, i, lch);
	120	}
	121
	122	static void omap2_show_dma_caps(void)
	123	{
	124	u8 revision = dma_read(REVISION, 0) & 0xff;
	125	printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
	126	revision >> 4, revision & 0xf);
	127	return;
	128	}
	129
	130	static u32 configure_dma_errata(void)
	131	{
	132
	133	/*
	134	* Errata applicable for OMAP2430ES1.0 and all omap2420
	135	*
	136	* I.
	137	* Erratum ID: Not Available
	138	* Inter Frame DMA buffering issue DMA will wrongly
	139	* buffer elements if packing and bursting is enabled. This might
	140	* result in data gets stalled in FIFO at the end of the block.
	141	* Workaround: DMA channels must have BUFFERING_DISABLED bit set to
	142	* guarantee no data will stay in the DMA FIFO in case inter frame
	143	* buffering occurs
	144	*
	145	* II.
	146	* Erratum ID: Not Available
	147	* DMA may hang when several channels are used in parallel
	148	* In the following configuration, DMA channel hanging can occur:
	149	* a. Channel i, hardware synchronized, is enabled
	150	* b. Another channel (Channel x), software synchronized, is enabled.
	151	* c. Channel i is disabled before end of transfer
	152	* d. Channel i is reenabled.
	153	* e. Steps 1 to 4 are repeated a certain number of times.
	154	* f. A third channel (Channel y), software synchronized, is enabled.
	155	* Channel x and Channel y may hang immediately after step 'f'.
	156	* Workaround:
	157	* For any channel used - make sure NextLCH_ID is set to the value j.
	158	*/
	159	if (cpu_is_omap2420() \|\| (cpu_is_omap2430() &&
	160	(omap_type() == OMAP2430_REV_ES1_0))) {
	161
	162	SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
	163	SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
	164	}
	165
	166	/*
	167	* Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
	168	* after a transaction error.
	169	* Workaround: SW should explicitely disable the channel.
	170	*/
	171	if (cpu_class_is_omap2())
	172	SET_DMA_ERRATA(DMA_ERRATA_i378);
	173
	174	/*
	175	* Erratum ID: i541: sDMA FIFO draining does not finish
	176	* If sDMA channel is disabled on the fly, sDMA enters standby even
	177	* through FIFO Drain is still in progress
	178	* Workaround: Put sDMA in NoStandby more before a logical channel is
	179	* disabled, then put it back to SmartStandby right after the channel
	180	* finishes FIFO draining.
	181	*/
	182	if (cpu_is_omap34xx())
183	SET_DMA_ERRATA(DMA_ERRATA_i541);
184
185	/*
186	* Erratum ID: i88 : Special programming model needed to disable DMA
187	* before end of block.
188	* Workaround: software must ensure that the DMA is configured in No
189	* Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
190	*/
191	if (omap_type() == OMAP3430_REV_ES1_0)
192	SET_DMA_ERRATA(DMA_ERRATA_i88);
193
194	/*
195	* Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
196	* read before the DMA controller finished disabling the channel.
197	*/
198	SET_DMA_ERRATA(DMA_ERRATA_3_3);
199
200	/*
201	* Erratum ID: Not Available
202	* A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
203	* after secure sram context save and restore.
204	* Work around: Hence we need to manually clear those IRQs to avoid
205	* spurious interrupts. This affects only secure devices.
206	*/
207	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
208	SET_DMA_ERRATA(DMA_ROMCODE_BUG);
209
210	return errata;
211	}
212
59de3cf1 MK	213	/* One time initializations */
	214	static int __init omap2_system_dma_init_dev(struct omap_hwmod oh, void unused)
	215	{
3528c58e	216	struct platform_device *pdev;
59de3cf1	217	struct omap_system_dma_plat_info *p;
f31cc962	218	struct resource *mem;
59de3cf1 MK	219	char *name = "omap_dma_system";
	220
	221	p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
	222	if (!p) {
	223	pr_err("%s: Unable to allocate pdata for %s:%s\n",
	224	__func__, name, oh->name);
	225	return -ENOMEM;
	226	}
	227
f31cc962	228	p->dma_attr = (struct omap_dma_dev_attr *)oh->dev_attr;
f31cc962 MK	229	p->show_dma_caps = omap2_show_dma_caps;
	230	p->clear_dma = omap2_clear_dma;
	231	p->dma_write = dma_write;
	232	p->dma_read = dma_read;
	233
	234	p->clear_lch_regs = NULL;
	235
	236	p->errata = configure_dma_errata();
	237
c1d1cd59	238	pdev = omap_device_build(name, 0, oh, p, sizeof(*p));
59de3cf1	239	kfree(p);
3528c58e	240	if (IS_ERR(pdev)) {
25985edc	241	pr_err("%s: Can't build omap_device for %s:%s.\n",
59de3cf1	242	__func__, name, oh->name);
3528c58e	243	return PTR_ERR(pdev);
59de3cf1 MK	244	}
59de3cf1 MK	245
3528c58e	246	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
f31cc962	247	if (!mem) {
3528c58e	248	dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
f31cc962 MK	249	return -EINVAL;
	250	}
	251	dma_base = ioremap(mem->start, resource_size(mem));
	252	if (!dma_base) {
3528c58e	253	dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
f31cc962 MK	254	return -ENOMEM;
	255	}
	256
	257	d = oh->dev_attr;
	258	d->chan = kzalloc(sizeof(struct omap_dma_lch) *
	259	(d->lch_count), GFP_KERNEL);
	260
	261	if (!d->chan) {
3528c58e	262	dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__);
f31cc962 MK	263	return -ENOMEM;
f31cc962 MK	264	}
f6d5e079	265
82809601 TL	266	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
	267	d->dev_caps \|= HS_CHANNELS_RESERVED;
	268
f6d5e079 S	269	/* Check the capabilities register for descriptor loading feature */
	270	if (dma_read(CAPS_0, 0) & DMA_HAS_DESCRIPTOR_CAPS)
	271	dma_common_ch_end = CCDN;
	272	else
	273	dma_common_ch_end = CCFN;
	274
59de3cf1 MK	275	return 0;
	276	}
	277
be1f9481 TL	278	static const struct platform_device_info omap_dma_dev_info = {
	279	.name = "omap-dma-engine",
	280	.id = -1,
	281	.dma_mask = DMA_BIT_MASK(32),
	282	};
	283
59de3cf1 MK	284	static int __init omap2_system_dma_init(void)
59de3cf1 MK	285	{
be1f9481 TL	286	struct platform_device *pdev;
	287	int res;
	288
	289	res = omap_hwmod_for_each_by_class("dma",
59de3cf1	290	omap2_system_dma_init_dev, NULL);
be1f9481 TL	291	if (res)
	292	return res;
	293
8d30662a JH	294	if (of_have_populated_dt())
	295	return res;
	296
be1f9481 TL	297	pdev = platform_device_register_full(&omap_dma_dev_info);
	298	if (IS_ERR(pdev))
	299	return PTR_ERR(pdev);
	300
	301	return res;
59de3cf1	302	}
b76c8b19	303	omap_arch_initcall(omap2_system_dma_init);