+++ /dev/null
-From 5c9f8c2dbdbe53818bcde6aa6695e1331e5f841f Mon Sep 17 00:00:00 2001
-From: Jonathan McDowell <noodles@earth.li>
-Date: Sat, 14 Nov 2020 14:02:33 +0000
-Subject: dmaengine: qcom: Add ADM driver
-
-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.
-
-The hardware only supports a 32 bit physical address, so specifying
-!PHYS_ADDR_T_64BIT gives maximum COMPILE_TEST coverage without having to
-spend effort on kludging things in the code that will never actually be
-needed on real hardware.
-
-Signed-off-by: Andy Gross <agross@codeaurora.org>
-Signed-off-by: Thomas Pedersen <twp@codeaurora.org>
-Signed-off-by: Jonathan McDowell <noodles@earth.li>
-Link: https://lore.kernel.org/r/20201114140233.GM32650@earth.li
-Signed-off-by: Vinod Koul <vkoul@kernel.org>
----
- drivers/dma/qcom/Kconfig | 11 +
- drivers/dma/qcom/Makefile | 1 +
- drivers/dma/qcom/qcom_adm.c | 903 ++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 915 insertions(+)
- create mode 100644 drivers/dma/qcom/qcom_adm.c
-
---- a/drivers/dma/qcom/Kconfig
-+++ b/drivers/dma/qcom/Kconfig
-@@ -1,4 +1,15 @@
- # SPDX-License-Identifier: GPL-2.0-only
-+config QCOM_ADM
-+ tristate "Qualcomm ADM support"
-+ depends on (ARCH_QCOM || COMPILE_TEST) && !PHYS_ADDR_T_64BIT
-+ select DMA_ENGINE
-+ select DMA_VIRTUAL_CHANNELS
-+ help
-+ Enable support for the Qualcomm Application Data Mover (ADM) DMA
-+ controller, as present on MSM8x60, APQ8064, and IPQ8064 devices.
-+ This controller provides DMA capabilities for both general purpose
-+ and on-chip peripheral devices.
-+
- config QCOM_BAM_DMA
- tristate "QCOM BAM DMA support"
- depends on ARCH_QCOM || (COMPILE_TEST && OF && ARM)
---- a/drivers/dma/qcom/Makefile
-+++ b/drivers/dma/qcom/Makefile
-@@ -1,4 +1,5 @@
- # SPDX-License-Identifier: GPL-2.0
-+obj-$(CONFIG_QCOM_ADM) += qcom_adm.o
- obj-$(CONFIG_QCOM_BAM_DMA) += bam_dma.o
- obj-$(CONFIG_QCOM_HIDMA_MGMT) += hdma_mgmt.o
- hdma_mgmt-objs := hidma_mgmt.o hidma_mgmt_sys.o
---- /dev/null
-+++ b/drivers/dma/qcom/qcom_adm.c
-@@ -0,0 +1,903 @@
-+// SPDX-License-Identifier: GPL-2.0-only
-+/*
-+ * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
-+ */
-+
-+#include <linux/clk.h>
-+#include <linux/delay.h>
-+#include <linux/device.h>
-+#include <linux/dmaengine.h>
-+#include <linux/dma-mapping.h>
-+#include <linux/init.h>
-+#include <linux/interrupt.h>
-+#include <linux/io.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/of_address.h>
-+#include <linux/of_irq.h>
-+#include <linux/of_dma.h>
-+#include <linux/platform_device.h>
-+#include <linux/reset.h>
-+#include <linux/scatterlist.h>
-+#include <linux/slab.h>
-+
-+#include "../dmaengine.h"
-+#include "../virt-dma.h"
-+
-+/* ADM registers - calculated from channel number and security domain */
-+#define ADM_CHAN_MULTI 0x4
-+#define ADM_CI_MULTI 0x4
-+#define ADM_CRCI_MULTI 0x4
-+#define ADM_EE_MULTI 0x800
-+#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
-+#define ADM_EE_OFFS(ee) (ADM_EE_MULTI * (ee))
-+#define ADM_CHAN_EE_OFFS(chan, ee) (ADM_CHAN_OFFS(chan) + ADM_EE_OFFS(ee))
-+#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
-+#define ADM_CI_OFFS(ci) (ADM_CHAN_OFF(ci))
-+#define ADM_CH_CMD_PTR(chan, ee) (ADM_CHAN_EE_OFFS(chan, ee))
-+#define ADM_CH_RSLT(chan, ee) (0x40 + ADM_CHAN_EE_OFFS(chan, ee))
-+#define ADM_CH_FLUSH_STATE0(chan, ee) (0x80 + ADM_CHAN_EE_OFFS(chan, ee))
-+#define ADM_CH_STATUS_SD(chan, ee) (0x200 + ADM_CHAN_EE_OFFS(chan, ee))
-+#define ADM_CH_CONF(chan) (0x240 + ADM_CHAN_OFFS(chan))
-+#define ADM_CH_RSLT_CONF(chan, ee) (0x300 + ADM_CHAN_EE_OFFS(chan, ee))
-+#define ADM_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + ADM_EE_OFFS(ee))
-+#define ADM_CI_CONF(ci) (0x390 + (ci) * ADM_CI_MULTI)
-+#define ADM_GP_CTL 0x3d8
-+#define ADM_CRCI_CTL(crci, ee) (0x400 + (crci) * ADM_CRCI_MULTI + \
-+ ADM_EE_OFFS(ee))
-+
-+/* channel status */
-+#define ADM_CH_STATUS_VALID BIT(1)
-+
-+/* channel result */
-+#define ADM_CH_RSLT_VALID BIT(31)
-+#define ADM_CH_RSLT_ERR BIT(3)
-+#define ADM_CH_RSLT_FLUSH BIT(2)
-+#define ADM_CH_RSLT_TPD BIT(1)
-+
-+/* channel conf */
-+#define ADM_CH_CONF_SHADOW_EN BIT(12)
-+#define ADM_CH_CONF_MPU_DISABLE BIT(11)
-+#define ADM_CH_CONF_PERM_MPU_CONF BIT(9)
-+#define ADM_CH_CONF_FORCE_RSLT_EN BIT(7)
-+#define ADM_CH_CONF_SEC_DOMAIN(ee) ((((ee) & 0x3) << 4) | (((ee) & 0x4) << 11))
-+
-+/* channel result conf */
-+#define ADM_CH_RSLT_CONF_FLUSH_EN BIT(1)
-+#define ADM_CH_RSLT_CONF_IRQ_EN BIT(0)
-+
-+/* CRCI CTL */
-+#define ADM_CRCI_CTL_MUX_SEL BIT(18)
-+#define ADM_CRCI_CTL_RST BIT(17)
-+
-+/* CI configuration */
-+#define ADM_CI_RANGE_END(x) ((x) << 24)
-+#define ADM_CI_RANGE_START(x) ((x) << 16)
-+#define ADM_CI_BURST_4_WORDS BIT(2)
-+#define ADM_CI_BURST_8_WORDS BIT(3)
-+
-+/* GP CTL */
-+#define ADM_GP_CTL_LP_EN BIT(12)
-+#define ADM_GP_CTL_LP_CNT(x) ((x) << 8)
-+
-+/* Command pointer list entry */
-+#define ADM_CPLE_LP BIT(31)
-+#define ADM_CPLE_CMD_PTR_LIST BIT(29)
-+
-+/* Command list entry */
-+#define ADM_CMD_LC BIT(31)
-+#define ADM_CMD_DST_CRCI(n) (((n) & 0xf) << 7)
-+#define ADM_CMD_SRC_CRCI(n) (((n) & 0xf) << 3)
-+
-+#define ADM_CMD_TYPE_SINGLE 0x0
-+#define ADM_CMD_TYPE_BOX 0x3
-+
-+#define ADM_CRCI_MUX_SEL BIT(4)
-+#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_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:
-+ case 32:
-+ case 64:
-+ case 128:
-+ ret = ffs(burst >> 4) - 1;
-+ break;
-+ case 192:
-+ ret = 4;
-+ break;
-+ case 256:
-+ ret = 5;
-+ break;
-+ default:
-+ ret = -EINVAL;
-+ break;
-+ }
-+
-+ return ret;
-+}
-+
-+/**
-+ * adm_process_fc_descriptors - Process descriptors for flow controlled xfers
-+ *
-+ * @achan: ADM channel
-+ * @desc: Descriptor memory pointer
-+ * @sg: Scatterlist entry
-+ * @crci: CRCI value
-+ * @burst: Burst size of transaction
-+ * @direction: DMA transfer direction
-+ */
-+static void *adm_process_fc_descriptors(struct adm_chan *achan, void *desc,
-+ struct scatterlist *sg, u32 crci,
-+ u32 burst,
-+ enum dma_transfer_direction direction)
-+{
-+ struct adm_desc_hw_box *box_desc = NULL;
-+ struct adm_desc_hw_single *single_desc;
-+ u32 remainder = sg_dma_len(sg);
-+ u32 rows, row_offset, crci_cmd;
-+ u32 mem_addr = sg_dma_address(sg);
-+ u32 *incr_addr = &mem_addr;
-+ u32 *src, *dst;
-+
-+ if (direction == DMA_DEV_TO_MEM) {
-+ crci_cmd = ADM_CMD_SRC_CRCI(crci);
-+ row_offset = burst;
-+ src = &achan->slave.src_addr;
-+ dst = &mem_addr;
-+ } else {
-+ crci_cmd = ADM_CMD_DST_CRCI(crci);
-+ row_offset = burst << 16;
-+ src = &mem_addr;
-+ dst = &achan->slave.dst_addr;
-+ }
-+
-+ while (remainder >= burst) {
-+ box_desc = desc;
-+ box_desc->cmd = ADM_CMD_TYPE_BOX | crci_cmd;
-+ box_desc->row_offset = row_offset;
-+ box_desc->src_addr = *src;
-+ box_desc->dst_addr = *dst;
-+
-+ rows = remainder / burst;
-+ rows = min_t(u32, rows, ADM_MAX_ROWS);
-+ box_desc->num_rows = rows << 16 | rows;
-+ box_desc->row_len = burst << 16 | burst;
-+
-+ *incr_addr += burst * rows;
-+ remainder -= burst * rows;
-+ desc += sizeof(*box_desc);
-+ }
-+
-+ /* if leftover bytes, do one single descriptor */
-+ if (remainder) {
-+ single_desc = desc;
-+ single_desc->cmd = ADM_CMD_TYPE_SINGLE | crci_cmd;
-+ single_desc->len = remainder;
-+ single_desc->src_addr = *src;
-+ single_desc->dst_addr = *dst;
-+ desc += sizeof(*single_desc);
-+
-+ if (sg_is_last(sg))
-+ single_desc->cmd |= ADM_CMD_LC;
-+ } else {
-+ if (box_desc && sg_is_last(sg))
-+ box_desc->cmd |= ADM_CMD_LC;
-+ }
-+
-+ return desc;
-+}
-+
-+/**
-+ * adm_process_non_fc_descriptors - Process descriptors for non-fc xfers
-+ *
-+ * @achan: ADM channel
-+ * @desc: Descriptor memory pointer
-+ * @sg: Scatterlist entry
-+ * @direction: DMA transfer direction
-+ */
-+static void *adm_process_non_fc_descriptors(struct adm_chan *achan, void *desc,
-+ struct scatterlist *sg,
-+ enum dma_transfer_direction direction)
-+{
-+ struct adm_desc_hw_single *single_desc;
-+ u32 remainder = sg_dma_len(sg);
-+ u32 mem_addr = sg_dma_address(sg);
-+ u32 *incr_addr = &mem_addr;
-+ u32 *src, *dst;
-+
-+ if (direction == DMA_DEV_TO_MEM) {
-+ src = &achan->slave.src_addr;
-+ dst = &mem_addr;
-+ } else {
-+ src = &mem_addr;
-+ dst = &achan->slave.dst_addr;
-+ }
-+
-+ do {
-+ single_desc = desc;
-+ single_desc->cmd = ADM_CMD_TYPE_SINGLE;
-+ single_desc->src_addr = *src;
-+ single_desc->dst_addr = *dst;
-+ single_desc->len = (remainder > ADM_MAX_XFER) ?
-+ ADM_MAX_XFER : remainder;
-+
-+ remainder -= single_desc->len;
-+ *incr_addr += single_desc->len;
-+ desc += sizeof(*single_desc);
-+ } while (remainder);
-+
-+ /* set last command if this is the end of the whole transaction */
-+ if (sg_is_last(sg))
-+ single_desc->cmd |= ADM_CMD_LC;
-+
-+ return desc;
-+}
-+
-+/**
-+ * 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;
-+ dma_addr_t cple_addr;
-+ u32 i, burst;
-+ u32 single_count = 0, box_count = 0, crci = 0;
-+ void *desc;
-+ u32 *cple;
-+ 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
-+ */
-+ burst = (direction == DMA_MEM_TO_DEV) ?
-+ achan->slave.dst_maxburst :
-+ achan->slave.src_maxburst;
-+
-+ /* 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: %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 (achan->slave.device_fc) {
-+ box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
-+ ADM_MAX_ROWS);
-+ if (sg_dma_len(sg) % burst)
-+ single_count++;
-+ } else {
-+ single_count += DIV_ROUND_UP(sg_dma_len(sg),
-+ ADM_MAX_XFER);
-+ }
-+ }
-+
-+ async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
-+ if (!async_desc)
-+ return ERR_PTR(-ENOMEM);
-+
-+ if (crci)
-+ async_desc->mux = achan->slave.slave_id & ADM_CRCI_MUX_SEL ?
-+ ADM_CRCI_CTL_MUX_SEL : 0;
-+ async_desc->crci = crci;
-+ async_desc->blk_size = blk_size;
-+ async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
-+ box_count * sizeof(struct adm_desc_hw_box) +
-+ sizeof(*cple) + 2 * ADM_DESC_ALIGN;
-+
-+ async_desc->cpl = kzalloc(async_desc->dma_len, GFP_NOWAIT);
-+ if (!async_desc->cpl)
-+ goto free;
-+
-+ 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);
-+
-+ for_each_sg(sgl, sg, sg_len, i) {
-+ async_desc->length += sg_dma_len(sg);
-+
-+ if (achan->slave.device_fc)
-+ desc = adm_process_fc_descriptors(achan, desc, sg, crci,
-+ burst, direction);
-+ else
-+ desc = adm_process_non_fc_descriptors(achan, desc, sg,
-+ direction);
-+ }
-+
-+ async_desc->dma_addr = dma_map_single(adev->dev, async_desc->cpl,
-+ async_desc->dma_len,
-+ DMA_TO_DEVICE);
-+ if (dma_mapping_error(adev->dev, async_desc->dma_addr))
-+ goto free;
-+
-+ cple_addr = async_desc->dma_addr + ((void *)cple - async_desc->cpl);
-+
-+ /* init cmd list */
-+ dma_sync_single_for_cpu(adev->dev, cple_addr, sizeof(*cple),
-+ DMA_TO_DEVICE);
-+ *cple = ADM_CPLE_LP;
-+ *cple |= (async_desc->dma_addr + ADM_DESC_ALIGN) >> 3;
-+ dma_sync_single_for_device(adev->dev, cple_addr, sizeof(*cple),
-+ DMA_TO_DEVICE);
-+
-+ return vchan_tx_prep(&achan->vc, &async_desc->vd, flags);
-+
-+free:
-+ kfree(async_desc);
-+ return ERR_PTR(-ENOMEM);
-+}
-+
-+/**
-+ * 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 int adm_terminate_all(struct dma_chan *chan)
-+{
-+ struct adm_chan *achan = to_adm_chan(chan);
-+ struct adm_device *adev = achan->adev;
-+ unsigned long flags;
-+ LIST_HEAD(head);
-+
-+ spin_lock_irqsave(&achan->vc.lock, flags);
-+ vchan_get_all_descriptors(&achan->vc, &head);
-+
-+ /* send flush command to terminate current transaction */
-+ writel_relaxed(0x0,
-+ adev->regs + ADM_CH_FLUSH_STATE0(achan->id, adev->ee));
-+
-+ spin_unlock_irqrestore(&achan->vc.lock, flags);
-+
-+ vchan_dma_desc_free_list(&achan->vc, &head);
-+
-+ return 0;
-+}
-+
-+static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
-+{
-+ struct adm_chan *achan = to_adm_chan(chan);
-+ unsigned long flag;
-+
-+ spin_lock_irqsave(&achan->vc.lock, flag);
-+ memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
-+ spin_unlock_irqrestore(&achan->vc.lock, flag);
-+
-+ return 0;
-+}
-+
-+/**
-+ * 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(ADM_CH_CONF_SHADOW_EN |
-+ ADM_CH_CONF_PERM_MPU_CONF |
-+ ADM_CH_CONF_MPU_DISABLE |
-+ ADM_CH_CONF_SEC_DOMAIN(adev->ee),
-+ adev->regs + ADM_CH_CONF(achan->id));
-+
-+ writel(ADM_CH_RSLT_CONF_IRQ_EN | ADM_CH_RSLT_CONF_FLUSH_EN,
-+ adev->regs + ADM_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 + ADM_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 + ADM_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 +
-+ ADM_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 +
-+ ADM_CH_STATUS_SD(i, adev->ee));
-+
-+ /* if no result present, skip */
-+ if (!(status & ADM_CH_STATUS_VALID))
-+ continue;
-+
-+ result = readl_relaxed(adev->regs +
-+ ADM_CH_RSLT(i, adev->ee));
-+
-+ /* no valid results, skip */
-+ if (!(result & ADM_CH_RSLT_VALID))
-+ continue;
-+
-+ /* flag error if transaction was flushed or failed */
-+ if (result & (ADM_CH_RSLT_ERR | ADM_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;
-+}
-+
-+/**
-+ * 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_unmap_single(async_desc->adev->dev, async_desc->dma_addr,
-+ async_desc->dma_len, DMA_TO_DEVICE);
-+ kfree(async_desc->cpl);
-+ 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;
-+ int ret;
-+ u32 i;
-+
-+ adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
-+ if (!adev)
-+ return -ENOMEM;
-+
-+ adev->dev = &pdev->dev;
-+
-+ adev->regs = devm_platform_ioremap_resource(pdev, 0);
-+ 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);
-+
-+ adev->iface_clk = devm_clk_get(adev->dev, "iface");
-+ if (IS_ERR(adev->iface_clk))
-+ return PTR_ERR(adev->iface_clk);
-+
-+ adev->clk_reset = devm_reset_control_get_exclusive(&pdev->dev, "clk");
-+ if (IS_ERR(adev->clk_reset)) {
-+ dev_err(adev->dev, "failed to get ADM0 reset\n");
-+ return PTR_ERR(adev->clk_reset);
-+ }
-+
-+ adev->c0_reset = devm_reset_control_get_exclusive(&pdev->dev, "c0");
-+ if (IS_ERR(adev->c0_reset)) {
-+ dev_err(adev->dev, "failed to get ADM0 C0 reset\n");
-+ return PTR_ERR(adev->c0_reset);
-+ }
-+
-+ adev->c1_reset = devm_reset_control_get_exclusive(&pdev->dev, "c1");
-+ if (IS_ERR(adev->c1_reset)) {
-+ dev_err(adev->dev, "failed to get ADM0 C1 reset\n");
-+ return PTR_ERR(adev->c1_reset);
-+ }
-+
-+ adev->c2_reset = devm_reset_control_get_exclusive(&pdev->dev, "c2");
-+ if (IS_ERR(adev->c2_reset)) {
-+ dev_err(adev->dev, "failed to get ADM0 C2 reset\n");
-+ return PTR_ERR(adev->c2_reset);
-+ }
-+
-+ ret = clk_prepare_enable(adev->core_clk);
-+ if (ret) {
-+ dev_err(adev->dev, "failed to prepare/enable core clock\n");
-+ return ret;
-+ }
-+
-+ 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;
-+ }
-+
-+ reset_control_assert(adev->clk_reset);
-+ reset_control_assert(adev->c0_reset);
-+ reset_control_assert(adev->c1_reset);
-+ reset_control_assert(adev->c2_reset);
-+
-+ udelay(2);
-+
-+ 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(ADM_CRCI_CTL_RST, adev->regs +
-+ ADM_CRCI_CTL(i, adev->ee));
-+
-+ /* configure client interfaces */
-+ writel(ADM_CI_RANGE_START(0x40) | ADM_CI_RANGE_END(0xb0) |
-+ ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(0));
-+ writel(ADM_CI_RANGE_START(0x2a) | ADM_CI_RANGE_END(0x2c) |
-+ ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(1));
-+ writel(ADM_CI_RANGE_START(0x12) | ADM_CI_RANGE_END(0x28) |
-+ ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(2));
-+ writel(ADM_GP_CTL_LP_EN | ADM_GP_CTL_LP_CNT(0xf),
-+ adev->regs + ADM_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.directions = BIT(DMA_DEV_TO_MEM | DMA_MEM_TO_DEV);
-+ adev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
-+ adev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
-+ adev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
-+ adev->common.device_free_chan_resources = adm_free_chan;
-+ adev->common.device_prep_slave_sg = adm_prep_slave_sg;
-+ adev->common.device_issue_pending = adm_issue_pending;
-+ adev->common.device_tx_status = adm_tx_status;
-+ adev->common.device_terminate_all = adm_terminate_all;
-+ adev->common.device_config = adm_slave_config;
-+
-+ 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,
-+ of_dma_xlate_by_chan_id,
-+ &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);
-+
-+ for (i = 0; i < ADM_MAX_CHANNELS; i++) {
-+ achan = &adev->channels[i];
-+
-+ /* mask IRQs for this channel/EE pair */
-+ writel(0, adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
-+
-+ tasklet_kill(&adev->channels[i].vc.task);
-+ adm_terminate_all(&adev->channels[i].vc.chan);
-+ }
-+
-+ devm_free_irq(adev->dev, adev->irq, adev);
-+
-+ 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 <agross@codeaurora.org>");
-+MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
-+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / chunkeey.git / blobdiff