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-rw-r--r--target/linux/layerscape/patches-5.4/806-dma-0026-dma-caam-add-dma-memcpy-driver.patch538
1 files changed, 538 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/806-dma-0026-dma-caam-add-dma-memcpy-driver.patch b/target/linux/layerscape/patches-5.4/806-dma-0026-dma-caam-add-dma-memcpy-driver.patch
new file mode 100644
index 0000000000..073842eb13
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/806-dma-0026-dma-caam-add-dma-memcpy-driver.patch
@@ -0,0 +1,538 @@
+From 27aa9f97887f599267c345075e61979de785c770 Mon Sep 17 00:00:00 2001
+From: Peng Ma <peng.ma@nxp.com>
+Date: Thu, 11 Oct 2018 16:49:41 +0800
+Subject: [PATCH] dma: caam: add dma memcpy driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This module introduces a memcpy DMA driver based on the DMA capabilities
+of the CAAM hardware block. CAAM DMA is a platform driver that is only
+probed if the device is defined in the device tree. The driver creates
+a DMA channel for each JR of the CAAM. This introduces a dependency on
+the JR driver. Therefore a defering mechanism was used to ensure that
+the CAAM DMA driver is probed only after the JR driver.
+
+Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
+Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
+Signed-off-by: Rajiv Vishwakarma <rajiv.vishwakarma@nxp.com>
+Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
+[rebase]
+Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
+---
+ drivers/dma/Kconfig | 19 +-
+ drivers/dma/Makefile | 1 +
+ drivers/dma/caam_dma.c | 462 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 481 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/dma/caam_dma.c
+
+--- a/drivers/dma/Kconfig
++++ b/drivers/dma/Kconfig
+@@ -131,6 +131,24 @@ config COH901318
+ help
+ Enable support for ST-Ericsson COH 901 318 DMA.
+
++config CRYPTO_DEV_FSL_CAAM_DMA
++ tristate "CAAM DMA engine support"
++ depends on CRYPTO_DEV_FSL_CAAM_JR
++ default n
++ select DMA_ENGINE
++ select ASYNC_CORE
++ select ASYNC_TX_ENABLE_CHANNEL_SWITCH
++ help
++ Selecting this will offload the DMA operations for users of
++ the scatter gather memcopy API to the CAAM via job rings. The
++ CAAM is a hardware module that provides hardware acceleration to
++ cryptographic operations. It has a built-in DMA controller that can
++ be programmed to read/write cryptographic data. This module defines
++ a DMA driver that uses the DMA capabilities of the CAAM.
++
++ To compile this as a module, choose M here: the module
++ will be called caam_dma.
++
+ config DMA_BCM2835
+ tristate "BCM2835 DMA engine support"
+ depends on ARCH_BCM2835
+@@ -662,7 +680,6 @@ config ZX_DMA
+ help
+ Support the DMA engine for ZTE ZX family platform devices.
+
+-
+ # driver files
+ source "drivers/dma/bestcomm/Kconfig"
+
+--- a/drivers/dma/Makefile
++++ b/drivers/dma/Makefile
+@@ -77,6 +77,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
+ obj-$(CONFIG_ZX_DMA) += zx_dma.o
+ obj-$(CONFIG_ST_FDMA) += st_fdma.o
+ obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
++obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_DMA) += caam_dma.o
+
+ obj-y += mediatek/
+ obj-y += qcom/
+--- /dev/null
++++ b/drivers/dma/caam_dma.c
+@@ -0,0 +1,462 @@
++/*
++ * caam support for SG DMA
++ *
++ * Copyright 2016 Freescale Semiconductor, Inc
++ * Copyright 2017 NXP
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions are met:
++ * * Redistributions of source code must retain the above copyright
++ * notice, this list of conditions and the following disclaimer.
++ * * Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ * * Neither the names of the above-listed copyright holders nor the
++ * names of any contributors may be used to endorse or promote products
++ * derived from this software without specific prior written permission.
++ *
++ *
++ * ALTERNATIVELY, this software may be distributed under the terms of the
++ * GNU General Public License ("GPL") as published by the Free Software
++ * Foundation, either version 2 of that License or (at your option) any
++ * later version.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
++ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
++ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
++ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
++ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
++ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
++ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
++ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
++ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
++ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
++ * POSSIBILITY OF SUCH DAMAGE.
++ */
++
++#include <linux/dma-mapping.h>
++#include <linux/dmaengine.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++
++#include "dmaengine.h"
++
++#include "../crypto/caam/regs.h"
++#include "../crypto/caam/jr.h"
++#include "../crypto/caam/error.h"
++#include "../crypto/caam/desc_constr.h"
++
++#define DESC_DMA_MEMCPY_LEN ((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN) / \
++ CAAM_CMD_SZ)
++
++/*
++ * This is max chunk size of a DMA transfer. If a buffer is larger than this
++ * value it is internally broken into chunks of max CAAM_DMA_CHUNK_SIZE bytes
++ * and for each chunk a DMA transfer request is issued.
++ * This value is the largest number on 16 bits that is a multiple of 256 bytes
++ * (the largest configurable CAAM DMA burst size).
++ */
++#define CAAM_DMA_CHUNK_SIZE 65280
++
++struct caam_dma_sh_desc {
++ u32 desc[DESC_DMA_MEMCPY_LEN] ____cacheline_aligned;
++ dma_addr_t desc_dma;
++};
++
++/* caam dma extended descriptor */
++struct caam_dma_edesc {
++ struct dma_async_tx_descriptor async_tx;
++ struct list_head node;
++ struct caam_dma_ctx *ctx;
++ dma_addr_t src_dma;
++ dma_addr_t dst_dma;
++ unsigned int src_len;
++ unsigned int dst_len;
++ u32 jd[] ____cacheline_aligned;
++};
++
++/*
++ * caam_dma_ctx - per jr/channel context
++ * @chan: dma channel used by async_tx API
++ * @node: list_head used to attach to the global dma_ctx_list
++ * @jrdev: Job Ring device
++ * @pending_q: queue of pending (submitted, but not enqueued) jobs
++ * @done_not_acked: jobs that have been completed by jr, but maybe not acked
++ * @edesc_lock: protects extended descriptor
++ */
++struct caam_dma_ctx {
++ struct dma_chan chan;
++ struct list_head node;
++ struct device *jrdev;
++ struct list_head pending_q;
++ struct list_head done_not_acked;
++ spinlock_t edesc_lock;
++};
++
++static struct dma_device *dma_dev;
++static struct caam_dma_sh_desc *dma_sh_desc;
++static LIST_HEAD(dma_ctx_list);
++
++static dma_cookie_t caam_dma_tx_submit(struct dma_async_tx_descriptor *tx)
++{
++ struct caam_dma_edesc *edesc = NULL;
++ struct caam_dma_ctx *ctx = NULL;
++ dma_cookie_t cookie;
++
++ edesc = container_of(tx, struct caam_dma_edesc, async_tx);
++ ctx = container_of(tx->chan, struct caam_dma_ctx, chan);
++
++ spin_lock_bh(&ctx->edesc_lock);
++
++ cookie = dma_cookie_assign(tx);
++ list_add_tail(&edesc->node, &ctx->pending_q);
++
++ spin_unlock_bh(&ctx->edesc_lock);
++
++ return cookie;
++}
++
++static void caam_jr_chan_free_edesc(struct caam_dma_edesc *edesc)
++{
++ struct caam_dma_ctx *ctx = edesc->ctx;
++ struct caam_dma_edesc *_edesc = NULL;
++
++ spin_lock_bh(&ctx->edesc_lock);
++
++ list_add_tail(&edesc->node, &ctx->done_not_acked);
++ list_for_each_entry_safe(edesc, _edesc, &ctx->done_not_acked, node) {
++ if (async_tx_test_ack(&edesc->async_tx)) {
++ list_del(&edesc->node);
++ kfree(edesc);
++ }
++ }
++
++ spin_unlock_bh(&ctx->edesc_lock);
++}
++
++static void caam_dma_done(struct device *dev, u32 *hwdesc, u32 err,
++ void *context)
++{
++ struct caam_dma_edesc *edesc = context;
++ struct caam_dma_ctx *ctx = edesc->ctx;
++ dma_async_tx_callback callback;
++ void *callback_param;
++
++ if (err)
++ caam_jr_strstatus(ctx->jrdev, err);
++
++ dma_run_dependencies(&edesc->async_tx);
++
++ spin_lock_bh(&ctx->edesc_lock);
++ dma_cookie_complete(&edesc->async_tx);
++ spin_unlock_bh(&ctx->edesc_lock);
++
++ callback = edesc->async_tx.callback;
++ callback_param = edesc->async_tx.callback_param;
++
++ dma_descriptor_unmap(&edesc->async_tx);
++
++ caam_jr_chan_free_edesc(edesc);
++
++ if (callback)
++ callback(callback_param);
++}
++
++static void caam_dma_memcpy_init_job_desc(struct caam_dma_edesc *edesc)
++{
++ u32 *jd = edesc->jd;
++ u32 *sh_desc = dma_sh_desc->desc;
++ dma_addr_t desc_dma = dma_sh_desc->desc_dma;
++
++ /* init the job descriptor */
++ init_job_desc_shared(jd, desc_dma, desc_len(sh_desc), HDR_REVERSE);
++
++ /* set SEQIN PTR */
++ append_seq_in_ptr(jd, edesc->src_dma, edesc->src_len, 0);
++
++ /* set SEQOUT PTR */
++ append_seq_out_ptr(jd, edesc->dst_dma, edesc->dst_len, 0);
++
++ print_hex_dump_debug("caam dma desc@" __stringify(__LINE__) ": ",
++ DUMP_PREFIX_ADDRESS, 16, 4, jd, desc_bytes(jd), 1);
++}
++
++static struct dma_async_tx_descriptor *
++caam_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
++ size_t len, unsigned long flags)
++{
++ struct caam_dma_edesc *edesc;
++ struct caam_dma_ctx *ctx = container_of(chan, struct caam_dma_ctx,
++ chan);
++
++ edesc = kzalloc(sizeof(*edesc) + DESC_JOB_IO_LEN, GFP_DMA | GFP_NOWAIT);
++ if (!edesc)
++ return ERR_PTR(-ENOMEM);
++
++ dma_async_tx_descriptor_init(&edesc->async_tx, chan);
++ edesc->async_tx.tx_submit = caam_dma_tx_submit;
++ edesc->async_tx.flags = flags;
++ edesc->async_tx.cookie = -EBUSY;
++
++ edesc->src_dma = src;
++ edesc->src_len = len;
++ edesc->dst_dma = dst;
++ edesc->dst_len = len;
++ edesc->ctx = ctx;
++
++ caam_dma_memcpy_init_job_desc(edesc);
++
++ return &edesc->async_tx;
++}
++
++/* This function can be called in an interrupt context */
++static void caam_dma_issue_pending(struct dma_chan *chan)
++{
++ struct caam_dma_ctx *ctx = container_of(chan, struct caam_dma_ctx,
++ chan);
++ struct caam_dma_edesc *edesc, *_edesc;
++
++ spin_lock_bh(&ctx->edesc_lock);
++ list_for_each_entry_safe(edesc, _edesc, &ctx->pending_q, node) {
++ if (caam_jr_enqueue(ctx->jrdev, edesc->jd,
++ caam_dma_done, edesc) < 0)
++ break;
++ list_del(&edesc->node);
++ }
++ spin_unlock_bh(&ctx->edesc_lock);
++}
++
++static void caam_dma_free_chan_resources(struct dma_chan *chan)
++{
++ struct caam_dma_ctx *ctx = container_of(chan, struct caam_dma_ctx,
++ chan);
++ struct caam_dma_edesc *edesc, *_edesc;
++
++ spin_lock_bh(&ctx->edesc_lock);
++ list_for_each_entry_safe(edesc, _edesc, &ctx->pending_q, node) {
++ list_del(&edesc->node);
++ kfree(edesc);
++ }
++ list_for_each_entry_safe(edesc, _edesc, &ctx->done_not_acked, node) {
++ list_del(&edesc->node);
++ kfree(edesc);
++ }
++ spin_unlock_bh(&ctx->edesc_lock);
++}
++
++static int caam_dma_jr_chan_bind(void)
++{
++ struct device *jrdev;
++ struct caam_dma_ctx *ctx;
++ int bonds = 0;
++ int i;
++
++ for (i = 0; i < caam_jr_driver_probed(); i++) {
++ jrdev = caam_jridx_alloc(i);
++ if (IS_ERR(jrdev)) {
++ pr_err("job ring device %d allocation failed\n", i);
++ continue;
++ }
++
++ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
++ if (!ctx) {
++ caam_jr_free(jrdev);
++ continue;
++ }
++
++ ctx->chan.device = dma_dev;
++ ctx->chan.private = ctx;
++
++ ctx->jrdev = jrdev;
++
++ INIT_LIST_HEAD(&ctx->pending_q);
++ INIT_LIST_HEAD(&ctx->done_not_acked);
++ INIT_LIST_HEAD(&ctx->node);
++ spin_lock_init(&ctx->edesc_lock);
++
++ dma_cookie_init(&ctx->chan);
++
++ /* add the context of this channel to the context list */
++ list_add_tail(&ctx->node, &dma_ctx_list);
++
++ /* add this channel to the device chan list */
++ list_add_tail(&ctx->chan.device_node, &dma_dev->channels);
++
++ bonds++;
++ }
++
++ return bonds;
++}
++
++static inline void caam_jr_dma_free(struct dma_chan *chan)
++{
++ struct caam_dma_ctx *ctx = container_of(chan, struct caam_dma_ctx,
++ chan);
++
++ list_del(&ctx->node);
++ list_del(&chan->device_node);
++ caam_jr_free(ctx->jrdev);
++ kfree(ctx);
++}
++
++static void set_caam_dma_desc(u32 *desc)
++{
++ u32 *jmp_cmd;
++
++ /* dma shared descriptor */
++ init_sh_desc(desc, HDR_SHARE_NEVER | (1 << HDR_START_IDX_SHIFT));
++
++ /* REG1 = CAAM_DMA_CHUNK_SIZE */
++ append_math_add_imm_u32(desc, REG1, ZERO, IMM, CAAM_DMA_CHUNK_SIZE);
++
++ /* REG0 = SEQINLEN - CAAM_DMA_CHUNK_SIZE */
++ append_math_sub_imm_u32(desc, REG0, SEQINLEN, IMM, CAAM_DMA_CHUNK_SIZE);
++
++ /*
++ * if (REG0 > 0)
++ * jmp to LABEL1
++ */
++ jmp_cmd = append_jump(desc, JUMP_TEST_INVALL | JUMP_COND_MATH_N |
++ JUMP_COND_MATH_Z);
++
++ /* REG1 = SEQINLEN */
++ append_math_sub(desc, REG1, SEQINLEN, ZERO, CAAM_CMD_SZ);
++
++ /* LABEL1 */
++ set_jump_tgt_here(desc, jmp_cmd);
++
++ /* VARSEQINLEN = REG1 */
++ append_math_add(desc, VARSEQINLEN, REG1, ZERO, CAAM_CMD_SZ);
++
++ /* VARSEQOUTLEN = REG1 */
++ append_math_add(desc, VARSEQOUTLEN, REG1, ZERO, CAAM_CMD_SZ);
++
++ /* do FIFO STORE */
++ append_seq_fifo_store(desc, 0, FIFOST_TYPE_METADATA | LDST_VLF);
++
++ /* do FIFO LOAD */
++ append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 |
++ FIFOLD_TYPE_IFIFO | LDST_VLF);
++
++ /*
++ * if (REG0 > 0)
++ * jmp 0xF8 (after shared desc header)
++ */
++ append_jump(desc, JUMP_TEST_INVALL | JUMP_COND_MATH_N |
++ JUMP_COND_MATH_Z | 0xF8);
++
++ print_hex_dump_debug("caam dma shdesc@" __stringify(__LINE__) ": ",
++ DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
++ 1);
++}
++
++static int caam_dma_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct device *ctrldev = dev->parent;
++ struct dma_chan *chan, *_chan;
++ u32 *sh_desc;
++ int err = -ENOMEM;
++ int bonds;
++
++ if (!caam_jr_driver_probed()) {
++ dev_info(dev, "Defer probing after JR driver probing\n");
++ return -EPROBE_DEFER;
++ }
++
++ dma_dev = kzalloc(sizeof(*dma_dev), GFP_KERNEL);
++ if (!dma_dev)
++ return -ENOMEM;
++
++ dma_sh_desc = kzalloc(sizeof(*dma_sh_desc), GFP_KERNEL | GFP_DMA);
++ if (!dma_sh_desc)
++ goto desc_err;
++
++ sh_desc = dma_sh_desc->desc;
++ set_caam_dma_desc(sh_desc);
++ dma_sh_desc->desc_dma = dma_map_single(ctrldev, sh_desc,
++ desc_bytes(sh_desc),
++ DMA_TO_DEVICE);
++ if (dma_mapping_error(ctrldev, dma_sh_desc->desc_dma)) {
++ dev_err(dev, "unable to map dma descriptor\n");
++ goto map_err;
++ }
++
++ INIT_LIST_HEAD(&dma_dev->channels);
++
++ bonds = caam_dma_jr_chan_bind();
++ if (!bonds) {
++ err = -ENODEV;
++ goto jr_bind_err;
++ }
++
++ dma_dev->dev = dev;
++ dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
++ dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
++ dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
++ dma_dev->device_tx_status = dma_cookie_status;
++ dma_dev->device_issue_pending = caam_dma_issue_pending;
++ dma_dev->device_prep_dma_memcpy = caam_dma_prep_memcpy;
++ dma_dev->device_free_chan_resources = caam_dma_free_chan_resources;
++
++ err = dma_async_device_register(dma_dev);
++ if (err) {
++ dev_err(dev, "Failed to register CAAM DMA engine\n");
++ goto jr_bind_err;
++ }
++
++ dev_info(dev, "caam dma support with %d job rings\n", bonds);
++
++ return err;
++
++jr_bind_err:
++ list_for_each_entry_safe(chan, _chan, &dma_dev->channels, device_node)
++ caam_jr_dma_free(chan);
++
++ dma_unmap_single(ctrldev, dma_sh_desc->desc_dma, desc_bytes(sh_desc),
++ DMA_TO_DEVICE);
++map_err:
++ kfree(dma_sh_desc);
++desc_err:
++ kfree(dma_dev);
++ return err;
++}
++
++static int caam_dma_remove(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct device *ctrldev = dev->parent;
++ struct caam_dma_ctx *ctx, *_ctx;
++
++ dma_async_device_unregister(dma_dev);
++
++ list_for_each_entry_safe(ctx, _ctx, &dma_ctx_list, node) {
++ list_del(&ctx->node);
++ caam_jr_free(ctx->jrdev);
++ kfree(ctx);
++ }
++
++ dma_unmap_single(ctrldev, dma_sh_desc->desc_dma,
++ desc_bytes(dma_sh_desc->desc), DMA_TO_DEVICE);
++
++ kfree(dma_sh_desc);
++ kfree(dma_dev);
++
++ dev_info(dev, "caam dma support disabled\n");
++ return 0;
++}
++
++static struct platform_driver caam_dma_driver = {
++ .driver = {
++ .name = "caam-dma",
++ },
++ .probe = caam_dma_probe,
++ .remove = caam_dma_remove,
++};
++module_platform_driver(caam_dma_driver);
++
++MODULE_LICENSE("Dual BSD/GPL");
++MODULE_DESCRIPTION("NXP CAAM support for DMA engine");
++MODULE_AUTHOR("NXP Semiconductors");
++MODULE_ALIAS("platform:caam-dma");
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-28 15:49:13 +0000