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Tegra: gpcdma: driver for general purpose DMA 

This patch adds the driver for the general purpose DMA hardware
block on newer Tegra SoCs. The GPCDMA is a special purpose DMA
used to speed up memory copy operations to/from DRAM and TZSRAM.

This patch introduces a macro 'USE_GPC_DMA' to allow platforms
to override CPU based memory operations.

Change-Id: I3170d409c83b77e785437b1002a8d70188fabbeb
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar 2017-06-28 14:38:19 -07:00
parent 76a7cd3346
commit 647d4a035a
4 changed files with 212 additions and 0 deletions
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188
plat/nvidia/tegra/common/drivers/gpcdma/gpcdma.c Normal file
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@ -0,0 +1,188 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch_helpers.h>
#include <common/debug.h>
#include <delay_timer.h>
#include <errno.h>
#include <gpcdma.h>
#include <mmio.h>
#include <platform_def.h>
#include <stdbool.h>
#include <tegra_def.h>
#include <utils_def.h>
/* DMA channel registers */
#define DMA_CH_CSR U(0x0)
#define DMA_CH_CSR_WEIGHT_SHIFT U(10)
#define DMA_CH_CSR_XFER_MODE_SHIFT U(21)
#define DMA_CH_CSR_DMA_MODE_MEM2MEM U(4)
#define DMA_CH_CSR_DMA_MODE_FIXEDPATTERN U(6)
#define DMA_CH_CSR_IRQ_MASK_ENABLE (U(1) << 15)
#define DMA_CH_CSR_RUN_ONCE (U(1) << 27)
#define DMA_CH_CSR_ENABLE (U(1) << 31)
#define DMA_CH_STAT U(0x4)
#define DMA_CH_STAT_BUSY (U(1) << 31)
#define DMA_CH_SRC_PTR U(0xC)
#define DMA_CH_DST_PTR U(0x10)
#define DMA_CH_HI_ADR_PTR U(0x14)
#define DMA_CH_HI_ADR_PTR_SRC_MASK U(0xFF)
#define DMA_CH_HI_ADR_PTR_DST_SHIFT U(16)
#define DMA_CH_HI_ADR_PTR_DST_MASK U(0xFF)
#define DMA_CH_MC_SEQ U(0x18)
#define DMA_CH_MC_SEQ_REQ_CNT_SHIFT U(25)
#define DMA_CH_MC_SEQ_REQ_CNT_VAL U(0x10)
#define DMA_CH_MC_SEQ_BURST_SHIFT U(23)
#define DMA_CH_MC_SEQ_BURST_16_WORDS U(0x3)
#define DMA_CH_WORD_COUNT U(0x20)
#define DMA_CH_FIXED_PATTERN U(0x34)
#define DMA_CH_TZ U(0x38)
#define DMA_CH_TZ_ACCESS_ENABLE U(0)
#define DMA_CH_TZ_ACCESS_DISABLE U(3)
#define MAX_TRANSFER_SIZE (1U*1024U*1024U*1024U) /* 1GB */
#define GPCDMA_TIMEOUT_MS U(100)
#define GPCDMA_RESET_BIT (U(1) << 1)
static bool init_done;
static void tegra_gpcdma_write32(uint32_t offset, uint32_t val)
{
mmio_write_32(TEGRA_GPCDMA_BASE + offset, val);
}
static uint32_t tegra_gpcdma_read32(uint32_t offset)
{
return mmio_read_32(TEGRA_GPCDMA_BASE + offset);
}
static void tegra_gpcdma_init(void)
{
/* assert reset for DMA engine */
mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_GPCDMA_RST_SET_REG_OFFSET,
GPCDMA_RESET_BIT);
udelay(2);
/* de-assert reset for DMA engine */
mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_GPCDMA_RST_CLR_REG_OFFSET,
GPCDMA_RESET_BIT);
}
static void tegra_gpcdma_memcpy_priv(uint64_t dst_addr, uint64_t src_addr,
uint32_t num_bytes, uint32_t mode)
{
uint32_t val, timeout = 0;
int32_t ret = 0;
/* sanity check byte count */
if ((num_bytes > MAX_TRANSFER_SIZE) || ((num_bytes & 0x3U) != U(0))) {
ret = -EINVAL;
}
/* initialise GPCDMA block */
if (!init_done) {
tegra_gpcdma_init();
init_done = true;
}
/* make sure channel isn't busy */
val = tegra_gpcdma_read32(DMA_CH_STAT);
if ((val & DMA_CH_STAT_BUSY) == DMA_CH_STAT_BUSY) {
ERROR("DMA channel is busy\n");
ret = -EBUSY;
}
if (ret == 0) {
/* disable any DMA transfers */
tegra_gpcdma_write32(DMA_CH_CSR, 0);
/* enable DMA access to TZDRAM */
tegra_gpcdma_write32(DMA_CH_TZ, DMA_CH_TZ_ACCESS_ENABLE);
/* configure MC sequencer */
val = (DMA_CH_MC_SEQ_REQ_CNT_VAL << DMA_CH_MC_SEQ_REQ_CNT_SHIFT) |
(DMA_CH_MC_SEQ_BURST_16_WORDS << DMA_CH_MC_SEQ_BURST_SHIFT);
tegra_gpcdma_write32(DMA_CH_MC_SEQ, val);
/* reset fixed pattern */
tegra_gpcdma_write32(DMA_CH_FIXED_PATTERN, 0);
/* populate src and dst address registers */
tegra_gpcdma_write32(DMA_CH_SRC_PTR, (uint32_t)src_addr);
tegra_gpcdma_write32(DMA_CH_DST_PTR, (uint32_t)dst_addr);
val = (uint32_t)((src_addr >> 32) & DMA_CH_HI_ADR_PTR_SRC_MASK);
val |= (uint32_t)(((dst_addr >> 32) & DMA_CH_HI_ADR_PTR_DST_MASK) <<
DMA_CH_HI_ADR_PTR_DST_SHIFT);
tegra_gpcdma_write32(DMA_CH_HI_ADR_PTR, val);
/* transfer size (in words) */
tegra_gpcdma_write32(DMA_CH_WORD_COUNT, ((num_bytes >> 2) - 1U));
/* populate value for CSR */
val = (mode << DMA_CH_CSR_XFER_MODE_SHIFT) |
DMA_CH_CSR_RUN_ONCE | (U(1) << DMA_CH_CSR_WEIGHT_SHIFT) |
DMA_CH_CSR_IRQ_MASK_ENABLE;
tegra_gpcdma_write32(DMA_CH_CSR, val);
/* enable transfer */
val = tegra_gpcdma_read32(DMA_CH_CSR);
val |= DMA_CH_CSR_ENABLE;
tegra_gpcdma_write32(DMA_CH_CSR, val);
/* wait till transfer completes */
do {
/* read the status */
val = tegra_gpcdma_read32(DMA_CH_STAT);
if ((val & DMA_CH_STAT_BUSY) != DMA_CH_STAT_BUSY) {
break;
}
mdelay(1);
timeout++;
} while (timeout < GPCDMA_TIMEOUT_MS);
/* flag timeout error */
if (timeout == GPCDMA_TIMEOUT_MS) {
ERROR("DMA transfer timed out\n");
}
dsbsy();
/* disable DMA access to TZDRAM */
tegra_gpcdma_write32(DMA_CH_TZ, DMA_CH_TZ_ACCESS_DISABLE);
isb();
}
}
/*******************************************************************************
* Memcpy using GPCDMA block (Mem2Mem copy)
******************************************************************************/
void tegra_gpcdma_memcpy(uint64_t dst_addr, uint64_t src_addr,
uint32_t num_bytes)
{
tegra_gpcdma_memcpy_priv(dst_addr, src_addr, num_bytes,
DMA_CH_CSR_DMA_MODE_MEM2MEM);
}
/*******************************************************************************
* Memset using GPCDMA block (Fixed pattern write)
******************************************************************************/
void tegra_gpcdma_zeromem(uint64_t dst_addr, uint32_t num_bytes)
{
tegra_gpcdma_memcpy_priv(dst_addr, 0, num_bytes,
DMA_CH_CSR_DMA_MODE_FIXEDPATTERN);
}

16
plat/nvidia/tegra/include/drivers/gpcdma.h Normal file
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@ -0,0 +1,16 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __GPCDMA_H__
#define __GPCDMA_H__
#include <stdint.h>
void tegra_gpcdma_memcpy(uint64_t dst_addr, uint64_t src_addr,
uint32_t num_bytes);
void tegra_gpcdma_zeromem(uint64_t dst_addr, uint32_t num_bytes);
#endif /* __GPCDMA_H__ */

7
plat/nvidia/tegra/include/t186/tegra_def.h
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@ -115,6 +115,11 @@
#define TSA_CONFIG_CSW_MEMTYPE_OVERRIDE_MASK (U(0x3) << 11)
#define TSA_CONFIG_CSW_MEMTYPE_OVERRIDE_PASTHRU (U(0) << 11)
/*******************************************************************************
* Tegra General Purpose Centralised DMA constants
******************************************************************************/
#define TEGRA_GPCDMA_BASE U(0x2610000)
/*******************************************************************************
* Tegra Memory Controller constants
******************************************************************************/
@ -198,6 +203,8 @@
#define TEGRA_CAR_RESET_BASE U(0x05000000)
#define TEGRA_GPU_RESET_REG_OFFSET U(0x30)
#define GPU_RESET_BIT (U(1) << 0)
#define TEGRA_GPCDMA_RST_SET_REG_OFFSET U(0x6A0004)
#define TEGRA_GPCDMA_RST_CLR_REG_OFFSET U(0x6A0008)
/*******************************************************************************
* Tegra micro-seconds timer constants

1
plat/nvidia/tegra/soc/t186/platform_t186.mk
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@ -50,6 +50,7 @@ PLAT_INCLUDES += -I${SOC_DIR}/drivers/include
BL31_SOURCES += lib/cpus/aarch64/denver.S \
lib/cpus/aarch64/cortex_a57.S \
${COMMON_DIR}/drivers/gpcdma/gpcdma.c \
${COMMON_DIR}/drivers/memctrl/memctrl_v2.c \
${COMMON_DIR}/drivers/smmu/smmu.c \
${SOC_DIR}/drivers/mce/mce.c \