arch/arm/mach-omap2/dma.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP2+ DMA driver
   4  *
   5  * Copyright (C) 2003 - 2008 Nokia Corporation
   6  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   7  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   8  * Graphics DMA and LCD DMA graphics tranformations
   9  * by Imre Deak <imre.deak@nokia.com>
  10  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  11  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  12  *
  13  * Copyright (C) 2009 Texas Instruments
  14  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  15  *
  16  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
  17  * Converted DMA library into platform driver
  18  *      - G, Manjunath Kondaiah <manjugk@ti.com>
  19  */
  20
  21 #include <linux/err.h>
  22 #include <linux/io.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/device.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/dmaengine.h>
  29 #include <linux/of.h>
  30 #include <linux/omap-dma.h>
  31
  32 #include "soc.h"
  33
  34 static const struct omap_dma_reg reg_map[] = {
  35         [REVISION]      = { 0x0000, 0x00, OMAP_DMA_REG_32BIT },
  36         [GCR]           = { 0x0078, 0x00, OMAP_DMA_REG_32BIT },
  37         [IRQSTATUS_L0]  = { 0x0008, 0x00, OMAP_DMA_REG_32BIT },
  38         [IRQSTATUS_L1]  = { 0x000c, 0x00, OMAP_DMA_REG_32BIT },
  39         [IRQSTATUS_L2]  = { 0x0010, 0x00, OMAP_DMA_REG_32BIT },
  40         [IRQSTATUS_L3]  = { 0x0014, 0x00, OMAP_DMA_REG_32BIT },
  41         [IRQENABLE_L0]  = { 0x0018, 0x00, OMAP_DMA_REG_32BIT },
  42         [IRQENABLE_L1]  = { 0x001c, 0x00, OMAP_DMA_REG_32BIT },
  43         [IRQENABLE_L2]  = { 0x0020, 0x00, OMAP_DMA_REG_32BIT },
  44         [IRQENABLE_L3]  = { 0x0024, 0x00, OMAP_DMA_REG_32BIT },
  45         [SYSSTATUS]     = { 0x0028, 0x00, OMAP_DMA_REG_32BIT },
  46         [OCP_SYSCONFIG] = { 0x002c, 0x00, OMAP_DMA_REG_32BIT },
  47         [CAPS_0]        = { 0x0064, 0x00, OMAP_DMA_REG_32BIT },
  48         [CAPS_2]        = { 0x006c, 0x00, OMAP_DMA_REG_32BIT },
  49         [CAPS_3]        = { 0x0070, 0x00, OMAP_DMA_REG_32BIT },
  50         [CAPS_4]        = { 0x0074, 0x00, OMAP_DMA_REG_32BIT },
  51
  52         /* Common register offsets */
  53         [CCR]           = { 0x0080, 0x60, OMAP_DMA_REG_32BIT },
  54         [CLNK_CTRL]     = { 0x0084, 0x60, OMAP_DMA_REG_32BIT },
  55         [CICR]          = { 0x0088, 0x60, OMAP_DMA_REG_32BIT },
  56         [CSR]           = { 0x008c, 0x60, OMAP_DMA_REG_32BIT },
  57         [CSDP]          = { 0x0090, 0x60, OMAP_DMA_REG_32BIT },
  58         [CEN]           = { 0x0094, 0x60, OMAP_DMA_REG_32BIT },
  59         [CFN]           = { 0x0098, 0x60, OMAP_DMA_REG_32BIT },
  60         [CSEI]          = { 0x00a4, 0x60, OMAP_DMA_REG_32BIT },
  61         [CSFI]          = { 0x00a8, 0x60, OMAP_DMA_REG_32BIT },
  62         [CDEI]          = { 0x00ac, 0x60, OMAP_DMA_REG_32BIT },
  63         [CDFI]          = { 0x00b0, 0x60, OMAP_DMA_REG_32BIT },
  64         [CSAC]          = { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
  65         [CDAC]          = { 0x00b8, 0x60, OMAP_DMA_REG_32BIT },
  66
  67         /* Channel specific register offsets */
  68         [CSSA]          = { 0x009c, 0x60, OMAP_DMA_REG_32BIT },
  69         [CDSA]          = { 0x00a0, 0x60, OMAP_DMA_REG_32BIT },
  70         [CCEN]          = { 0x00bc, 0x60, OMAP_DMA_REG_32BIT },
  71         [CCFN]          = { 0x00c0, 0x60, OMAP_DMA_REG_32BIT },
  72         [COLOR]         = { 0x00c4, 0x60, OMAP_DMA_REG_32BIT },
  73
  74         /* OMAP4 specific registers */
  75         [CDP]           = { 0x00d0, 0x60, OMAP_DMA_REG_32BIT },
  76         [CNDP]          = { 0x00d4, 0x60, OMAP_DMA_REG_32BIT },
  77         [CCDN]          = { 0x00d8, 0x60, OMAP_DMA_REG_32BIT },
  78 };
  79
  80 static unsigned configure_dma_errata(void)
  81 {
  82         unsigned errata = 0;
  83
  84         /*
  85          * Errata applicable for OMAP2430ES1.0 and all omap2420
  86          *
  87          * I.
  88          * Erratum ID: Not Available
  89          * Inter Frame DMA buffering issue DMA will wrongly
  90          * buffer elements if packing and bursting is enabled. This might
  91          * result in data gets stalled in FIFO at the end of the block.
  92          * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
  93          * guarantee no data will stay in the DMA FIFO in case inter frame
  94          * buffering occurs
  95          *
  96          * II.
  97          * Erratum ID: Not Available
  98          * DMA may hang when several channels are used in parallel
  99          * In the following configuration, DMA channel hanging can occur:
 100          * a. Channel i, hardware synchronized, is enabled
 101          * b. Another channel (Channel x), software synchronized, is enabled.
 102          * c. Channel i is disabled before end of transfer
 103          * d. Channel i is reenabled.
 104          * e. Steps 1 to 4 are repeated a certain number of times.
 105          * f. A third channel (Channel y), software synchronized, is enabled.
 106          * Channel x and Channel y may hang immediately after step 'f'.
 107          * Workaround:
 108          * For any channel used - make sure NextLCH_ID is set to the value j.
 109          */
 110         if (cpu_is_omap2420() || (cpu_is_omap2430() &&
 111                                 (omap_type() == OMAP2430_REV_ES1_0))) {
 112
 113                 SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
 114                 SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
 115         }
 116
 117         /*
 118          * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
 119          * after a transaction error.
 120          * Workaround: SW should explicitely disable the channel.
 121          */
 122         if (cpu_class_is_omap2())
 123                 SET_DMA_ERRATA(DMA_ERRATA_i378);
 124
 125         /*
 126          * Erratum ID: i541: sDMA FIFO draining does not finish
 127          * If sDMA channel is disabled on the fly, sDMA enters standby even
 128          * through FIFO Drain is still in progress
 129          * Workaround: Put sDMA in NoStandby more before a logical channel is
 130          * disabled, then put it back to SmartStandby right after the channel
 131          * finishes FIFO draining.
 132          */
 133         if (cpu_is_omap34xx())
 134                 SET_DMA_ERRATA(DMA_ERRATA_i541);
 135
 136         /*
 137          * Erratum ID: i88 : Special programming model needed to disable DMA
 138          * before end of block.
 139          * Workaround: software must ensure that the DMA is configured in No
 140          * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
 141          */
 142         if (omap_type() == OMAP3430_REV_ES1_0)
 143                 SET_DMA_ERRATA(DMA_ERRATA_i88);
 144
 145         /*
 146          * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
 147          * read before the DMA controller finished disabling the channel.
 148          */
 149         SET_DMA_ERRATA(DMA_ERRATA_3_3);
 150
 151         /*
 152          * Erratum ID: Not Available
 153          * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
 154          * after secure sram context save and restore.
 155          * Work around: Hence we need to manually clear those IRQs to avoid
 156          * spurious interrupts. This affects only secure devices.
 157          */
 158         if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
 159                 SET_DMA_ERRATA(DMA_ROMCODE_BUG);
 160
 161         return errata;
 162 }
 163
 164 static const struct dma_slave_map omap24xx_sdma_dt_map[] = {
 165         /* external DMA requests when tusb6010 is used */
 166         { "musb-hdrc.1.auto", "dmareq0", SDMA_FILTER_PARAM(2) },
 167         { "musb-hdrc.1.auto", "dmareq1", SDMA_FILTER_PARAM(3) },
 168         { "musb-hdrc.1.auto", "dmareq2", SDMA_FILTER_PARAM(14) }, /* OMAP2420 only */
 169         { "musb-hdrc.1.auto", "dmareq3", SDMA_FILTER_PARAM(15) }, /* OMAP2420 only */
 170         { "musb-hdrc.1.auto", "dmareq4", SDMA_FILTER_PARAM(16) }, /* OMAP2420 only */
 171         { "musb-hdrc.1.auto", "dmareq5", SDMA_FILTER_PARAM(64) }, /* OMAP2420 only */
 172 };
 173
 174 static struct omap_dma_dev_attr dma_attr = {
 175         .dev_caps = RESERVE_CHANNEL | DMA_LINKED_LCH | GLOBAL_PRIORITY |
 176                     IS_CSSA_32 | IS_CDSA_32,
 177         .lch_count = 32,
 178 };
 179
 180 struct omap_system_dma_plat_info dma_plat_info = {
 181         .reg_map        = reg_map,
 182         .channel_stride = 0x60,
 183         .dma_attr       = &dma_attr,
 184 };
 185
 186 /* One time initializations */
 187 static int __init omap2_system_dma_init(void)
 188 {
 189         dma_plat_info.errata = configure_dma_errata();
 190
 191         if (soc_is_omap24xx()) {
 192                 /* DMA slave map for drivers not yet converted to DT */
 193                 dma_plat_info.slave_map = omap24xx_sdma_dt_map;
 194                 dma_plat_info.slavecnt = ARRAY_SIZE(omap24xx_sdma_dt_map);
 195         }
 196
 197         if (!soc_is_omap242x())
 198                 dma_attr.dev_caps |= IS_RW_PRIORITY;
 199
 200         if (soc_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
 201                 dma_attr.dev_caps |= HS_CHANNELS_RESERVED;
 202
 203         return 0;
 204 }
 205 omap_arch_initcall(omap2_system_dma_init);