arch/arm/mach-omap2/dma.c - kernel/msm - Gitiles

 /*
  * 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 <plat/omap_hwmod.h>
 #include <plat/omap_device.h>
 #include <plat/dma.h>

 #define OMAP2_DMA_STRIDE	0x60

 static u32 errata;
 static u8 dma_stride;

 static struct omap_dma_dev_attr *d;

 static enum omap_reg_offsets dma_common_ch_start, 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 >= dma_common_ch_start) ? 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 >= dma_common_ch_start) ? dma_stride : 0;
 	offset = reg_map[reg] + (stride * lch);
 	val = __raw_readl(dma_base + offset);
 	return val;
 }

 static inline void omap2_disable_irq_lch(int lch)
 {
 	u32 val;

 	val = dma_read(IRQENABLE_L0, lch);
 	val &= ~(1 << lch);
 	dma_write(val, IRQENABLE_L0, lch);
 }

 static void omap2_clear_dma(int lch)
 {
 	int i = dma_common_ch_start;

 	for (; 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";

 	dma_stride		= OMAP2_DMA_STRIDE;
 	dma_common_ch_start	= CSDP;
 	if (cpu_is_omap3630() || cpu_is_omap44xx())
 		dma_common_ch_end = CCDN;
 	else
 		dma_common_ch_end = CCFN;

 	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->disable_irq_lch	= omap2_disable_irq_lch;
 	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), NULL, 0, 0);
 	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;
 	}
 	return 0;
 }

 static int __init omap2_system_dma_init(void)
 {
 	return omap_hwmod_for_each_by_class("dma",
 			omap2_system_dma_init_dev, NULL);
 }
 arch_initcall(omap2_system_dma_init);
	/*
	* 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 <plat/omap_hwmod.h>
	#include <plat/omap_device.h>
	#include <plat/dma.h>

	#define OMAP2_DMA_STRIDE 0x60

	static u32 errata;
	static u8 dma_stride;

	static struct omap_dma_dev_attr *d;

	static enum omap_reg_offsets dma_common_ch_start, 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 >= dma_common_ch_start) ? 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 >= dma_common_ch_start) ? dma_stride : 0;
	offset = reg_map[reg] + (stride * lch);
	val = __raw_readl(dma_base + offset);
	return val;
	}

	static inline void omap2_disable_irq_lch(int lch)
	{
	u32 val;

	val = dma_read(IRQENABLE_L0, lch);
	val &= ~(1 << lch);
	dma_write(val, IRQENABLE_L0, lch);
	}

	static void omap2_clear_dma(int lch)
	{
	int i = dma_common_ch_start;

	for (; 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";

	dma_stride = OMAP2_DMA_STRIDE;
	dma_common_ch_start = CSDP;
	if (cpu_is_omap3630() \|\| cpu_is_omap44xx())
	dma_common_ch_end = CCDN;
	else
	dma_common_ch_end = CCFN;

	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->disable_irq_lch = omap2_disable_irq_lch;
	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), NULL, 0, 0);
	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;
	}
	return 0;
	}

	static int __init omap2_system_dma_init(void)
	{
	return omap_hwmod_for_each_by_class("dma",
	omap2_system_dma_init_dev, NULL);
	}
	arch_initcall(omap2_system_dma_init);