From patchwork Thu Feb 12 05:46:05 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Gross X-Patchwork-Id: 5816311 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 07B959F380 for ; Thu, 12 Feb 2015 05:46:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 095C3201BB for ; Thu, 12 Feb 2015 05:46:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E227C201C0 for ; Thu, 12 Feb 2015 05:46:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754405AbbBLFqh (ORCPT ); Thu, 12 Feb 2015 00:46:37 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:36523 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753226AbbBLFqe (ORCPT ); Thu, 12 Feb 2015 00:46:34 -0500 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 2DC4014055A; Thu, 12 Feb 2015 05:46:34 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 1D0A21405A9; Thu, 12 Feb 2015 05:46:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost (rrcs-67-52-129-61.west.biz.rr.com [67.52.129.61]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: agross@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 422E814055A; Thu, 12 Feb 2015 05:46:32 +0000 (UTC) From: Andy Gross To: Vinod Koul Cc: devicetree@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Bjorn Andersson , Kumar Gala , Andy Gross Subject: [Patch v4 2/2] dmaengine: Add ADM driver Date: Wed, 11 Feb 2015 23:46:05 -0600 Message-Id: <1423719965-8156-3-git-send-email-agross@codeaurora.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1423719965-8156-1-git-send-email-agross@codeaurora.org> References: <1423719965-8156-1-git-send-email-agross@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add the DMA engine driver for the QCOM Application Data Mover (ADM) DMA controller found in the MSM8x60 and IPQ/APQ8064 platforms. The ADM supports both memory to memory transactions and memory to/from peripheral device transactions. The controller also provides flow control capabilities for transactions to/from peripheral devices. The initial release of this driver supports slave transfers to/from peripherals and also incorporates CRCI (client rate control interface) flow control. Signed-off-by: Andy Gross --- drivers/dma/Kconfig | 10 + drivers/dma/Makefile | 1 + drivers/dma/qcom_adm.c | 901 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 912 insertions(+) create mode 100644 drivers/dma/qcom_adm.c diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index f2b2c4e..69bc15e 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -464,4 +464,14 @@ config QCOM_BAM_DMA Enable support for the QCOM BAM DMA controller. This controller provides DMA capabilities for a variety of on-chip devices. +config QCOM_ADM + tristate "Qualcomm ADM support" + depends on ARCH_QCOM || (COMPILE_TEST && OF && ARM) + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + ---help--- + Enable support for the Qualcomm ADM DMA controller. This controller + provides DMA capabilities for both general purpose and on-chip + peripheral devices. + endif diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 2022b54..3b7ead6 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -50,3 +50,4 @@ obj-y += xilinx/ obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o +obj-$(CONFIG_QCOM_ADM) += qcom_adm.o diff --git a/drivers/dma/qcom_adm.c b/drivers/dma/qcom_adm.c new file mode 100644 index 0000000..baea945 --- /dev/null +++ b/drivers/dma/qcom_adm.c @@ -0,0 +1,901 @@ +/* + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "dmaengine.h" +#include "virt-dma.h" + +/* ADM registers - calculated from channel number and security domain */ +#define HI_CH_CMD_PTR(chan, ee) (4*chan + 0x20800*ee) +#define HI_CH_RSLT(chan, ee) (0x40 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE0(chan, ee) (0x80 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE1(chan, ee) (0xc0 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE2(chan, ee) (0x100 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE3(chan, ee) (0x140 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE4(chan, ee) (0x180 + 4*chan + 0x20800*ee) +#define HI_CH_FLUSH_STATE5(chan, ee) (0x1c0 + 4*chan + 0x20800*ee) +#define HI_CH_STATUS_SD(chan, ee) (0x200 + 4*chan + 0x20800*ee) +#define HI_CH_CONF(chan) (0x240 + 4*chan) +#define HI_CH_RSLT_CONF(chan, ee) (0x300 + 4*chan + 0x20800*ee) +#define HI_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + 0x20800*ee) +#define HI_CI_CONF(ci) (0x390 + 4*ci) +#define HI_CRCI_CONF0 0x3d0 +#define HI_CRCI_CONF1 0x3d4 +#define HI_GP_CTL 0x3d8 +#define HI_CRCI_CTL(crci, ee) (0x400 + 0x4*crci + 0x20800*ee) + +/* channel status */ +#define CH_STATUS_VALID BIT(1) + +/* channel result */ +#define CH_RSLT_VALID BIT(31) +#define CH_RSLT_ERR BIT(3) +#define CH_RSLT_FLUSH BIT(2) +#define CH_RSLT_TPD BIT(1) + +/* channel conf */ +#define CH_CONF_MPU_DISABLE BIT(11) +#define CH_CONF_PERM_MPU_CONF BIT(9) +#define CH_CONF_FLUSH_RSLT_EN BIT(8) +#define CH_CONF_FORCE_RSLT_EN BIT(7) +#define CH_CONF_IRQ_EN BIT(6) + +/* channel result conf */ +#define CH_RSLT_CONF_FLUSH_EN BIT(1) +#define CH_RSLT_CONF_IRQ_EN BIT(0) + +/* CRCI CTL */ +#define CRCI_CTL_MUX_SEL BIT(18) +#define CRCI_CTL_RST BIT(17) + +/* CI configuration */ +#define CI_RANGE_END(x) (x << 24) +#define CI_RANGE_START(x) (x << 16) +#define CI_BURST_4_WORDS 0x4 +#define CI_BURST_8_WORDS 0x8 + +/* GP CTL */ +#define GP_CTL_LP_EN BIT(12) +#define GP_CTL_LP_CNT(x) (x << 8) + +/* Command pointer list entry */ +#define CPLE_LP BIT(31) +#define CPLE_CMD_PTR_LIST BIT(29) + +/* Command list entry */ +#define CMD_LC BIT(31) +#define CMD_DST_CRCI(n) (((n) & 0xf) << 7) +#define CMD_SRC_CRCI(n) (((n) & 0xf) << 3) + +#define CMD_TYPE_SINGLE 0x0 +#define CMD_TYPE_BOX 0x3 + +#define ADM_DESC_ALIGN 8 +#define ADM_MAX_XFER (SZ_64K-1) +#define ADM_MAX_ROWS (SZ_64K-1) +#define ADM_MAX_CHANNELS 16 + +struct adm_desc_hw_box { + u32 cmd; + u32 src_addr; + u32 dst_addr; + u32 row_len; + u32 num_rows; + u32 row_offset; +}; + +struct adm_desc_hw_single { + u32 cmd; + u32 src_addr; + u32 dst_addr; + u32 len; +}; + +struct adm_async_desc { + struct virt_dma_desc vd; + struct adm_device *adev; + + size_t length; + enum dma_transfer_direction dir; + dma_addr_t dma_addr; + size_t dma_len; + + void *cpl; + dma_addr_t cp_addr; + u32 crci; + u32 mux; + u32 blk_size; +}; + +struct adm_chan { + struct virt_dma_chan vc; + struct adm_device *adev; + + /* parsed from DT */ + u32 id; /* channel id */ + + struct adm_async_desc *curr_txd; + struct dma_slave_config slave; + struct list_head node; + + int error; + int initialized; +}; + +static inline struct adm_chan *to_adm_chan(struct dma_chan *common) +{ + return container_of(common, struct adm_chan, vc.chan); +} + +struct adm_device { + void __iomem *regs; + struct device *dev; + struct dma_device common; + struct device_dma_parameters dma_parms; + struct adm_chan *channels; + + u32 ee; + + struct clk *core_clk; + struct clk *iface_clk; + + struct reset_control *clk_reset; + struct reset_control *c0_reset; + struct reset_control *c1_reset; + struct reset_control *c2_reset; + int irq; +}; + +/** + * adm_alloc_chan - Allocates channel resources for DMA channel + * + * This function is effectively a stub, as we don't need to setup any resources + */ +static int adm_alloc_chan(struct dma_chan *chan) +{ + return 0; +} + +/** + * adm_free_chan - Frees dma resources associated with the specific channel + * + * Free all allocated descriptors associated with this channel + * + */ +static void adm_free_chan(struct dma_chan *chan) +{ + /* free all queued descriptors */ + vchan_free_chan_resources(to_virt_chan(chan)); +} + +/** + * adm_get_blksize - Get block size from burst value + * + */ +static int adm_get_blksize(unsigned int burst) +{ + int ret; + + switch (burst) { + case 16: + ret = 0; + break; + case 32: + ret = 1; + break; + case 64: + ret = 2; + break; + case 128: + ret = 3; + break; + case 192: + ret = 4; + break; + case 256: + ret = 5; + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +/** + * adm_prep_slave_sg - Prep slave sg transaction + * + * @chan: dma channel + * @sgl: scatter gather list + * @sg_len: length of sg + * @direction: DMA transfer direction + * @flags: DMA flags + * @context: transfer context (unused) + */ +static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct adm_chan *achan = to_adm_chan(chan); + struct adm_device *adev = achan->adev; + struct adm_async_desc *async_desc; + struct scatterlist *sg; + u32 i; + u32 single_count = 0, box_count = 0, desc_offset = 0, crci = 0; + struct adm_desc_hw_box *box_desc; + struct adm_desc_hw_single *single_desc; + void *desc; + u32 *cple, *last_cmd; + u32 burst; + int blk_size = 0; + + + if (!is_slave_direction(direction)) { + dev_err(adev->dev, "invalid dma direction\n"); + return NULL; + } + + /* + * get burst value from slave configuration + * If zero, default to maximum burst size + * If larger than the max transfer size, set to ADM_MAX_XFER + */ + burst = (direction == DMA_MEM_TO_DEV) ? + achan->slave.dst_maxburst : + achan->slave.src_maxburst; + + if (!burst || burst > ADM_MAX_XFER) + burst = ADM_MAX_XFER; + + /* if using flow control, validate burst and crci values */ + if (achan->slave.device_fc) { + + blk_size = adm_get_blksize(burst); + if (blk_size < 0) { + dev_err(adev->dev, "invalid burst value w/ crci: %d\n", + burst); + return ERR_PTR(-EINVAL); + } + + crci = achan->slave.slave_id & 0xf; + if (!crci || achan->slave.slave_id > 0x1f) { + dev_err(adev->dev, "invalid crci value\n"); + return ERR_PTR(-EINVAL); + } + } + + /* iterate through sgs and compute allocation size of structures */ + for_each_sg(sgl, sg, sg_len, i) + if (sg_dma_len(sg) % burst) + single_count += DIV_ROUND_UP(sg_dma_len(sg), burst); + else + box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst, + ADM_MAX_ROWS); + + async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT); + if (!async_desc) + return ERR_PTR(-ENOMEM); + + if (crci) + async_desc->mux = achan->slave.slave_id >> 4 ? + CRCI_CTL_MUX_SEL : 0; + async_desc->crci = crci; + async_desc->blk_size = blk_size; + async_desc->dma_len = single_count * sizeof(*single_desc) + + box_count * sizeof(*box_desc) + sizeof(*cple) + + 2*ADM_DESC_ALIGN; + + async_desc->cpl = dma_alloc_writecombine(adev->dev, async_desc->dma_len, + &async_desc->dma_addr, GFP_NOWAIT); + + if (!async_desc->cpl) { + kfree(async_desc); + return ERR_PTR(-ENOMEM); + } + + async_desc->adev = adev; + + /* both command list entry and descriptors must be 8 byte aligned */ + cple = PTR_ALIGN(async_desc->cpl, ADM_DESC_ALIGN); + desc = PTR_ALIGN(cple + 1, ADM_DESC_ALIGN); + last_cmd = desc; + + /* init cmd list */ + *cple = CPLE_LP; + *cple |= (desc - async_desc->cpl + async_desc->dma_addr) >> 3; + + for_each_sg(sgl, sg, sg_len, i) { + unsigned int xfer_len, row_len, rows; + unsigned int remainder = sg_dma_len(sg); + unsigned int offset = 0; + + do { + /* use single if length is not multiple of burst */ + if (remainder % burst) { + single_desc = desc + desc_offset; + last_cmd = &single_desc->cmd; + single_desc->cmd = CMD_TYPE_SINGLE; + xfer_len = (remainder > ADM_MAX_XFER) ? + ADM_MAX_XFER : remainder; + if (direction == DMA_DEV_TO_MEM) { + single_desc->dst_addr = + sg_dma_address(sg) + offset; + single_desc->src_addr = + achan->slave.src_addr; + single_desc->len = xfer_len; + single_desc->cmd |= CMD_SRC_CRCI(crci); + } else { + single_desc->src_addr = + sg_dma_address(sg) + offset; + single_desc->dst_addr = + achan->slave.dst_addr; + single_desc->len = xfer_len; + single_desc->cmd |= CMD_DST_CRCI(crci); + } + + remainder -= xfer_len; + async_desc->length += xfer_len; + offset += xfer_len; + desc_offset += sizeof(*single_desc); + } else { + box_desc = desc + desc_offset; + last_cmd = &box_desc->cmd; + box_desc->cmd = CMD_TYPE_BOX; + box_desc->row_offset = 0; + + if (direction == DMA_DEV_TO_MEM) { + box_desc->dst_addr = + sg_dma_address(sg) + offset; + box_desc->src_addr = + achan->slave.src_addr; + box_desc->cmd |= CMD_SRC_CRCI(crci); + box_desc->row_offset = burst; + + } else { + box_desc->src_addr = + sg_dma_address(sg) + offset; + box_desc->dst_addr = + achan->slave.dst_addr; + box_desc->cmd |= CMD_DST_CRCI(crci); + box_desc->row_offset = burst << 16; + } + + desc_offset += sizeof(*box_desc); + rows = remainder / burst; + rows = min_t(u32, rows, ADM_MAX_ROWS); + row_len = burst; + box_desc->num_rows = rows << 16 | rows; + box_desc->row_len = row_len << 16 | row_len; + + remainder -= row_len * rows; + async_desc->length += row_len * rows; + offset += row_len * rows; + } + } while (remainder > 0); + } + + /* set last command flag */ + *last_cmd |= CMD_LC; + + return vchan_tx_prep(&achan->vc, &async_desc->vd, flags); +} + +/** + * adm_terminate_all - terminate all transactions on a channel + * @achan: adm dma channel + * + * Dequeues and frees all transactions, aborts current transaction + * No callbacks are done + * + */ +static void adm_terminate_all(struct adm_chan *achan) +{ + struct adm_device *adev = achan->adev; + unsigned long flags; + LIST_HEAD(head); + + /* send flush command to terminate current transaction */ + writel_relaxed(0x0, + adev->regs + HI_CH_FLUSH_STATE0(achan->id, adev->ee)); + + spin_lock_irqsave(&achan->vc.lock, flags); + vchan_get_all_descriptors(&achan->vc, &head); + spin_unlock_irqrestore(&achan->vc.lock, flags); + + vchan_dma_desc_free_list(&achan->vc, &head); +} + +/** + * adm_control - DMA device control + * @chan: dma channel + * @cmd: control cmd + * @arg: cmd argument + * + * Perform DMA control command + * + */ +static int adm_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, + unsigned long arg) +{ + struct adm_chan *achan = to_adm_chan(chan); + unsigned long flag; + int ret = 0; + + switch (cmd) { + case DMA_SLAVE_CONFIG: + spin_lock_irqsave(&achan->vc.lock, flag); + memcpy(&achan->slave, (void *)arg, + sizeof(struct dma_slave_config)); + spin_unlock_irqrestore(&achan->vc.lock, flag); + break; + + case DMA_TERMINATE_ALL: + adm_terminate_all(achan); + break; + + default: + ret = -ENXIO; + break; + }; + + return ret; +} + +/** + * adm_start_dma - start next transaction + * @achan - ADM dma channel + */ +static void adm_start_dma(struct adm_chan *achan) +{ + struct virt_dma_desc *vd = vchan_next_desc(&achan->vc); + struct adm_device *adev = achan->adev; + struct adm_async_desc *async_desc; + + lockdep_assert_held(&achan->vc.lock); + + if (!vd) + return; + + list_del(&vd->node); + + /* write next command list out to the CMD FIFO */ + async_desc = container_of(vd, struct adm_async_desc, vd); + achan->curr_txd = async_desc; + + /* reset channel error */ + achan->error = 0; + + if (!achan->initialized) { + /* enable interrupts */ + writel(CH_CONF_IRQ_EN | CH_CONF_FLUSH_RSLT_EN | + CH_CONF_FORCE_RSLT_EN | CH_CONF_PERM_MPU_CONF | + CH_CONF_MPU_DISABLE, + adev->regs + HI_CH_CONF(achan->id)); + + writel(CH_RSLT_CONF_IRQ_EN | CH_RSLT_CONF_FLUSH_EN, + adev->regs + HI_CH_RSLT_CONF(achan->id, adev->ee)); + + achan->initialized = 1; + } + + /* set the crci block size if this transaction requires CRCI */ + if (async_desc->crci) { + writel(async_desc->mux | async_desc->blk_size, + adev->regs + HI_CRCI_CTL(async_desc->crci, adev->ee)); + } + + /* make sure IRQ enable doesn't get reordered */ + wmb(); + + /* write next command list out to the CMD FIFO */ + writel(ALIGN(async_desc->dma_addr, ADM_DESC_ALIGN) >> 3, + adev->regs + HI_CH_CMD_PTR(achan->id, adev->ee)); +} + +/** + * adm_dma_irq - irq handler for ADM controller + * @irq: IRQ of interrupt + * @data: callback data + * + * IRQ handler for the bam controller + */ +static irqreturn_t adm_dma_irq(int irq, void *data) +{ + struct adm_device *adev = data; + u32 srcs, i; + struct adm_async_desc *async_desc; + unsigned long flags; + + srcs = readl_relaxed(adev->regs + + HI_SEC_DOMAIN_IRQ_STATUS(adev->ee)); + + for (i = 0; i < ADM_MAX_CHANNELS; i++) { + struct adm_chan *achan = &adev->channels[i]; + u32 status, result; + + if (srcs & BIT(i)) { + status = readl_relaxed(adev->regs + + HI_CH_STATUS_SD(i, adev->ee)); + + /* if no result present, skip */ + if (!(status & CH_STATUS_VALID)) + continue; + + result = readl_relaxed(adev->regs + + HI_CH_RSLT(i, adev->ee)); + + /* no valid results, skip */ + if (!(result & CH_RSLT_VALID)) + continue; + + /* flag error if transaction was flushed or failed */ + if (result & (CH_RSLT_ERR | CH_RSLT_FLUSH)) + achan->error = 1; + + spin_lock_irqsave(&achan->vc.lock, flags); + async_desc = achan->curr_txd; + + achan->curr_txd = NULL; + + if (async_desc) { + vchan_cookie_complete(&async_desc->vd); + + /* kick off next DMA */ + adm_start_dma(achan); + } + + spin_unlock_irqrestore(&achan->vc.lock, flags); + } + } + + return IRQ_HANDLED; +} + +/** + * adm_tx_status - returns status of transaction + * @chan: dma channel + * @cookie: transaction cookie + * @txstate: DMA transaction state + * + * Return status of dma transaction + */ +static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct adm_chan *achan = to_adm_chan(chan); + struct virt_dma_desc *vd; + enum dma_status ret; + unsigned long flags; + size_t residue = 0; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE || !txstate) + return ret; + + spin_lock_irqsave(&achan->vc.lock, flags); + + vd = vchan_find_desc(&achan->vc, cookie); + if (vd) + residue = container_of(vd, struct adm_async_desc, vd)->length; + + spin_unlock_irqrestore(&achan->vc.lock, flags); + + /* + * residue is either the full length if it is in the issued list, or 0 + * if it is in progress. We have no reliable way of determining + * anything inbetween + */ + dma_set_residue(txstate, residue); + + if (achan->error) + return DMA_ERROR; + + return ret; +} + +static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of) +{ + struct adm_device *adev = container_of(of->of_dma_data, + struct adm_device, common); + struct dma_chan *chan; + unsigned int request; + + if (dma_spec->args_count != 1) { + dev_err(adev->dev, "incorrect number of dma arguments\n"); + return NULL; + } + + request = dma_spec->args[0]; + if (request >= ADM_MAX_CHANNELS) + return NULL; + + chan = dma_get_slave_channel(&(adev->channels[request].vc.chan)); + + if (!chan) + return NULL; + + return chan; +} + +/** + * adm_issue_pending - starts pending transactions + * @chan: dma channel + * + * Issues all pending transactions and starts DMA + */ +static void adm_issue_pending(struct dma_chan *chan) +{ + struct adm_chan *achan = to_adm_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&achan->vc.lock, flags); + + if (vchan_issue_pending(&achan->vc) && !achan->curr_txd) + adm_start_dma(achan); + spin_unlock_irqrestore(&achan->vc.lock, flags); +} + +/** + * adm_dma_free_desc - free descriptor memory + * @vd: virtual descriptor + * + */ +static void adm_dma_free_desc(struct virt_dma_desc *vd) +{ + struct adm_async_desc *async_desc = container_of(vd, + struct adm_async_desc, vd); + + dma_free_writecombine(async_desc->adev->dev, async_desc->dma_len, + async_desc->cpl, async_desc->dma_addr); + kfree(async_desc); +} + +static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan, + u32 index) +{ + achan->id = index; + achan->adev = adev; + + vchan_init(&achan->vc, &adev->common); + achan->vc.desc_free = adm_dma_free_desc; +} + +static int adm_dma_probe(struct platform_device *pdev) +{ + struct adm_device *adev; + struct resource *iores; + int ret; + u32 i; + + adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL); + if (!adev) + return -ENOMEM; + + adev->dev = &pdev->dev; + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + adev->regs = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(adev->regs)) + return PTR_ERR(adev->regs); + + adev->irq = platform_get_irq(pdev, 0); + if (adev->irq < 0) + return adev->irq; + + ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &adev->ee); + if (ret) { + dev_err(adev->dev, "Execution environment unspecified\n"); + return ret; + } + + adev->core_clk = devm_clk_get(adev->dev, "core"); + if (IS_ERR(adev->core_clk)) + return PTR_ERR(adev->core_clk); + + ret = clk_prepare_enable(adev->core_clk); + if (ret) { + dev_err(adev->dev, "failed to prepare/enable core clock\n"); + return ret; + } + + adev->iface_clk = devm_clk_get(adev->dev, "iface"); + if (IS_ERR(adev->iface_clk)) { + ret = PTR_ERR(adev->iface_clk); + goto err_disable_core_clk; + } + + ret = clk_prepare_enable(adev->iface_clk); + if (ret) { + dev_err(adev->dev, "failed to prepare/enable iface clock\n"); + goto err_disable_core_clk; + } + + adev->clk_reset = devm_reset_control_get(&pdev->dev, "clk"); + if (IS_ERR(adev->clk_reset)) { + dev_err(adev->dev, "failed to get ADM0 reset\n"); + ret = PTR_ERR(adev->clk_reset); + goto err_disable_clks; + } + + adev->c0_reset = devm_reset_control_get(&pdev->dev, "c0"); + if (IS_ERR(adev->c0_reset)) { + dev_err(adev->dev, "failed to get ADM0 C0 reset\n"); + ret = PTR_ERR(adev->c0_reset); + goto err_disable_clks; + } + + adev->c1_reset = devm_reset_control_get(&pdev->dev, "c1"); + if (IS_ERR(adev->c1_reset)) { + dev_err(adev->dev, "failed to get ADM0 C1 reset\n"); + ret = PTR_ERR(adev->c1_reset); + goto err_disable_clks; + } + + adev->c2_reset = devm_reset_control_get(&pdev->dev, "c2"); + if (IS_ERR(adev->c2_reset)) { + dev_err(adev->dev, "failed to get ADM0 C2 reset\n"); + ret = PTR_ERR(adev->c2_reset); + goto err_disable_clks; + } + + reset_control_assert(adev->clk_reset); + reset_control_assert(adev->c0_reset); + reset_control_assert(adev->c1_reset); + reset_control_assert(adev->c2_reset); + + reset_control_deassert(adev->clk_reset); + reset_control_deassert(adev->c0_reset); + reset_control_deassert(adev->c1_reset); + reset_control_deassert(adev->c2_reset); + + adev->channels = devm_kcalloc(adev->dev, ADM_MAX_CHANNELS, + sizeof(*adev->channels), GFP_KERNEL); + + if (!adev->channels) { + ret = -ENOMEM; + goto err_disable_clks; + } + + /* allocate and initialize channels */ + INIT_LIST_HEAD(&adev->common.channels); + + for (i = 0; i < ADM_MAX_CHANNELS; i++) + adm_channel_init(adev, &adev->channels[i], i); + + /* reset CRCIs */ + for (i = 0; i < 16; i++) + writel(CRCI_CTL_RST, adev->regs + HI_CRCI_CTL(i, adev->ee)); + + /* configure client interfaces */ + writel(CI_RANGE_START(0x40) | CI_RANGE_END(0xb0) | CI_BURST_8_WORDS, + adev->regs + HI_CI_CONF(0)); + writel(CI_RANGE_START(0x2a) | CI_RANGE_END(0x2c) | CI_BURST_8_WORDS, + adev->regs + HI_CI_CONF(1)); + writel(CI_RANGE_START(0x12) | CI_RANGE_END(0x28) | CI_BURST_8_WORDS, + adev->regs + HI_CI_CONF(2)); + writel(GP_CTL_LP_EN | GP_CTL_LP_CNT(0xf), adev->regs + HI_GP_CTL); + + ret = devm_request_irq(adev->dev, adev->irq, adm_dma_irq, + 0, "adm_dma", adev); + if (ret) + goto err_disable_clks; + + platform_set_drvdata(pdev, adev); + + adev->common.dev = adev->dev; + adev->common.dev->dma_parms = &adev->dma_parms; + + /* set capabilities */ + dma_cap_zero(adev->common.cap_mask); + dma_cap_set(DMA_SLAVE, adev->common.cap_mask); + dma_cap_set(DMA_PRIVATE, adev->common.cap_mask); + + /* initialize dmaengine apis */ + adev->common.device_alloc_chan_resources = adm_alloc_chan; + adev->common.device_free_chan_resources = adm_free_chan; + adev->common.device_prep_slave_sg = adm_prep_slave_sg; + adev->common.device_control = adm_control; + adev->common.device_issue_pending = adm_issue_pending; + adev->common.device_tx_status = adm_tx_status; + + ret = dma_async_device_register(&adev->common); + if (ret) { + dev_err(adev->dev, "failed to register dma async device\n"); + goto err_disable_clks; + } + + ret = of_dma_controller_register(pdev->dev.of_node, adm_dma_xlate, + &adev->common); + if (ret) + goto err_unregister_dma; + + return 0; + +err_unregister_dma: + dma_async_device_unregister(&adev->common); +err_disable_clks: + clk_disable_unprepare(adev->iface_clk); +err_disable_core_clk: + clk_disable_unprepare(adev->core_clk); + + return ret; +} + +static int adm_dma_remove(struct platform_device *pdev) +{ + struct adm_device *adev = platform_get_drvdata(pdev); + struct adm_chan *achan; + u32 i; + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&adev->common); + + devm_free_irq(adev->dev, adev->irq, adev); + + for (i = 0; i < ADM_MAX_CHANNELS; i++) { + achan = &adev->channels[i]; + writel(CH_CONF_FLUSH_RSLT_EN, + adev->regs + HI_CH_CONF(achan->id)); + writel(CH_RSLT_CONF_FLUSH_EN, + adev->regs + HI_CH_RSLT_CONF(achan->id, adev->ee)); + + adm_terminate_all(&adev->channels[i]); + } + + clk_disable_unprepare(adev->core_clk); + clk_disable_unprepare(adev->iface_clk); + + return 0; +} + +static const struct of_device_id adm_of_match[] = { + { .compatible = "qcom,adm", }, + {} +}; +MODULE_DEVICE_TABLE(of, adm_of_match); + +static struct platform_driver adm_dma_driver = { + .probe = adm_dma_probe, + .remove = adm_dma_remove, + .driver = { + .name = "adm-dma-engine", + .of_match_table = adm_of_match, + }, +}; + +module_platform_driver(adm_dma_driver); + +MODULE_AUTHOR("Andy Gross "); +MODULE_DESCRIPTION("QCOM ADM DMA engine driver"); +MODULE_LICENSE("GPL v2");