| // 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" |
| |
| 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); |
