// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 - https://www.ti.com/
* Converted DMA library into platform driver
* - G, Manjunath Kondaiah <manjugk@ti.com>
*/
#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/dmaengine.h>
#include <linux/of.h>
#include <linux/omap-dma.h>
#include "soc.h"
#include "common.h"
static const struct omap_dma_reg reg_map[] = {
[REVISION] = { 0x0000, 0x00, OMAP_DMA_REG_32BIT },
[GCR] = { 0x0078, 0x00, OMAP_DMA_REG_32BIT },
[IRQSTATUS_L0] = { 0x0008, 0x00, OMAP_DMA_REG_32BIT },
[IRQSTATUS_L1] = { 0x000c, 0x00, OMAP_DMA_REG_32BIT },
[IRQSTATUS_L2] = { 0x0010, 0x00, OMAP_DMA_REG_32BIT },
[IRQSTATUS_L3] = { 0x0014, 0x00, OMAP_DMA_REG_32BIT },
[IRQENABLE_L0] = { 0x0018, 0x00, OMAP_DMA_REG_32BIT },
[IRQENABLE_L1] = { 0x001c, 0x00, OMAP_DMA_REG_32BIT },
[IRQENABLE_L2] = { 0x0020, 0x00, OMAP_DMA_REG_32BIT },
[IRQENABLE_L3] = { 0x0024, 0x00, OMAP_DMA_REG_32BIT },
[SYSSTATUS] = { 0x0028, 0x00, OMAP_DMA_REG_32BIT },
[OCP_SYSCONFIG] = { 0x002c, 0x00, OMAP_DMA_REG_32BIT },
[CAPS_0] = { 0x0064, 0x00, OMAP_DMA_REG_32BIT },
[CAPS_2] = { 0x006c, 0x00, OMAP_DMA_REG_32BIT },
[CAPS_3] = { 0x0070, 0x00, OMAP_DMA_REG_32BIT },
[CAPS_4] = { 0x0074, 0x00, OMAP_DMA_REG_32BIT },
/* Common register offsets */
[CCR] = { 0x0080, 0x60, OMAP_DMA_REG_32BIT },
[CLNK_CTRL] = { 0x0084, 0x60, OMAP_DMA_REG_32BIT },
[CICR] = { 0x0088, 0x60, OMAP_DMA_REG_32BIT },
[CSR] = { 0x008c, 0x60, OMAP_DMA_REG_32BIT },
[CSDP] = { 0x0090, 0x60, OMAP_DMA_REG_32BIT },
[CEN] = { 0x0094, 0x60, OMAP_DMA_REG_32BIT },
[CFN] = { 0x0098, 0x60, OMAP_DMA_REG_32BIT },
[CSEI] = { 0x00a4, 0x60, OMAP_DMA_REG_32BIT },
[CSFI] = { 0x00a8, 0x60, OMAP_DMA_REG_32BIT },
[CDEI] = { 0x00ac, 0x60, OMAP_DMA_REG_32BIT },
[CDFI] = { 0x00b0, 0x60, OMAP_DMA_REG_32BIT },
[CSAC] = { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
[CDAC] = { 0x00b8, 0x60, OMAP_DMA_REG_32BIT },
/* Channel specific register offsets */
[CSSA] = { 0x009c, 0x60, OMAP_DMA_REG_32BIT },
[CDSA] = { 0x00a0, 0x60, OMAP_DMA_REG_32BIT },
[CCEN] = { 0x00bc, 0x60, OMAP_DMA_REG_32BIT },
[CCFN] = { 0x00c0, 0x60, OMAP_DMA_REG_32BIT },
[COLOR] = { 0x00c4, 0x60, OMAP_DMA_REG_32BIT },
/* OMAP4 specific registers */
[CDP] = { 0x00d0, 0x60, OMAP_DMA_REG_32BIT },
[CNDP] = { 0x00d4, 0x60, OMAP_DMA_REG_32BIT },
[CCDN] = { 0x00d8, 0x60, OMAP_DMA_REG_32BIT },
};
static unsigned configure_dma_errata(void)
{
unsigned errata = 0;
/*
* 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;
}
static const struct dma_slave_map omap24xx_sdma_dt_map[] = {
/* external DMA requests when tusb6010 is used */
{ "musb-hdrc.1.auto", "dmareq0", SDMA_FILTER_PARAM(2) },
{ "musb-hdrc.1.auto", "dmareq1", SDMA_FILTER_PARAM(3) },
{ "musb-hdrc.1.auto", "dmareq2", SDMA_FILTER_PARAM(14) }, /* OMAP2420 only */
{ "musb-hdrc.1.auto", "dmareq3", SDMA_FILTER_PARAM(15) }, /* OMAP2420 only */
{ "musb-hdrc.1.auto", "dmareq4", SDMA_FILTER_PARAM(16) }, /* OMAP2420 only */
{ "musb-hdrc.1.auto", "dmareq5", SDMA_FILTER_PARAM(64) }, /* OMAP2420 only */
};
static struct omap_dma_dev_attr dma_attr = {
.dev_caps = RESERVE_CHANNEL | DMA_LINKED_LCH | GLOBAL_PRIORITY |
IS_CSSA_32 | IS_CDSA_32,
.lch_count = 32,
};
struct omap_system_dma_plat_info dma_plat_info = {
.reg_map = reg_map,
.channel_stride = 0x60,
.dma_attr = &dma_attr,
};
/* One time initializations */
static int __init omap2_system_dma_init(void)
{
dma_plat_info.errata = configure_dma_errata();
if (soc_is_omap24xx()) {
/* DMA slave map for drivers not yet converted to DT */
dma_plat_info.slave_map = omap24xx_sdma_dt_map;
dma_plat_info.slavecnt = ARRAY_SIZE(omap24xx_sdma_dt_map);
}
if (!soc_is_omap242x())
dma_attr.dev_caps |= IS_RW_PRIORITY;
if (soc_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
dma_attr.dev_caps |= HS_CHANNELS_RESERVED;
return 0;
}
omap_arch_initcall(omap2_system_dma_init);