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Diffstat (limited to 'src/soc/nvidia/tegra124/dma.c')
| -rw-r--r-- | src/soc/nvidia/tegra124/dma.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra124/dma.c b/src/soc/nvidia/tegra124/dma.c new file mode 100644 index 0000000000..964bb7b4a3 --- /dev/null +++ b/src/soc/nvidia/tegra124/dma.c @@ -0,0 +1,236 @@ +/* + * (C) Copyright 2010,2011 + * NVIDIA Corporation <www.nvidia.com> + * Copyright 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <inttypes.h> +#include <stddef.h> +#include <stdlib.h> +#include <console/console.h> + +#include <arch/io.h> +#include <soc/addressmap.h> + +#include "dma.h" + +/* + * Note: Many APB DMA controller registers are laid out such that each + * bit controls or represents the status for the corresponding channel. + * So we will not bother to list each individual bit in this case. + */ +#define APBDMA_COMMAND_GEN (1 << 31) + +#define APBDMA_CNTRL_REG_COUNT_VALUE_MASK 0xffff +#define APBDMA_CNTRL_REG_COUNT_VALUE_SHIFT 0 + +struct apb_dma { + u32 command; /* 0x00 */ + u32 status; /* 0x04 */ + u32 rsvd1[2]; + u32 cntrl_reg; /* 0x10 */ + u32 irq_sta_cpu; /* 0x14 */ + u32 irq_sta_cop; /* 0x18 */ + u32 irq_mask; /* 0x1c */ + u32 irq_mask_set; /* 0x20 */ + u32 irq_mask_clr; /* 0x24 */ + u32 trig_reg; /* 0x28 */ + u32 channel_trig_reg; /* 0x2c */ + u32 dma_status; /* 0x30 */ + u32 channel_en_reg; /* 0x34 */ + u32 security_reg; /* 0x38 */ + u32 channel_swid; /* 0x3c */ + u32 rsvd[1]; + u32 chan_wt_reg0; /* 0x44 */ + u32 chan_wt_reg1; /* 0x48 */ + u32 chan_wt_reg2; /* 0x4c */ + u32 chan_wr_reg3; /* 0x50 */ + u32 channel_swid1; /* 0x54 */ +} __attribute__((packed)); +struct apb_dma * const apb_dma = (struct apb_dma *)TEGRA_APB_DMA_BASE; + +/* + * Naming in the doc included a superfluous _CHANNEL_n_ for + * each entry and was left out for the sake of conciseness. + */ +#define APBDMACHAN_CSR_ENB (1 << 31) +#define APBDMACHAN_CSR_IE_EOC (1 << 30) +#define APBDMACHAN_CSR_HOLD (1 << 29) +#define APBDMACHAN_CSR_DIR (1 << 28) +#define APBDMACHAN_CSR_ONCE (1 << 27) +#define APBDMACHAN_CSR_FLOW (1 << 21) +#define APBDMACHAN_CSR_REQ_SEL_MASK 0x1f +#define APBDMACHAN_CSR_REQ_SEL_SHIFT 16 + +#define APBDMACHAN_STA_BSY (1 << 31) +#define APBDMACHAN_STA_ISE_EOC (1 << 30) +#define APBDMACHAN_STA_HALT (1 << 29) +#define APBDMACHAN_STA_PING_PONG_STA (1 << 28) +#define APBDMACHAN_STA_DMA_ACTIVITY (1 << 27) +#define APBDMACHAN_STA_CHANNEL_PAUSE (1 << 26) + +#define APBDMACHAN_CSRE_CHANNEL_PAUSE (1 << 31) +#define APBDMACHAN_CSRE_TRIG_SEL_MASK 0x3f +#define APBDMACHAN_CSRE_TRIG_SEL_SHIFT 14 + +#define APBDMACHAN_AHB_PTR_MASK (0x3fffffff) +#define APBDMACHAN_AHB_PTR_SHIFT 2 + +#define APBDMACHAN_AHB_SEQ_INTR_ENB (1 << 31) +#define APBDMACHAN_AHB_SEQ_AHB_BUS_WIDTH_MASK 0x7 +#define APBDMACHAN_AHB_SEQ_AHB_BUS_WIDTH_SHIFT 28 +#define APBDMACHAN_AHB_SEQ_AHB_DATA_SWAP (1 << 27) +#define APBDMACHAN_AHB_SEQ_AHB_BURST_MASK 0x7 +#define APBDMACHAN_AHB_SEQ_AHB_BURST_SHIFT 24 +#define APBDMACHAN_AHB_SEQ_DBL_BUF (1 << 19) +#define APBDMACHAN_AHB_SEQ_WRAP_MASK 0x7 +#define APBDMACHAN_AHB_SEQ_WRAP_SHIFT 16 + +#define APBDMACHAN_AHB_SEQ_AHB_BUS_WIDTH_MASK 0x7 +#define APBDMACHAN_AHB_SEQ_AHB_BUS_WIDTH_SHIFT 28 + +#define APBDMACHAN_APB_PTR_MASK 0x3fffffff +#define APBDMACHAN_APB_PTR_SHIFT 2 + +#define APBDMACHAN_APB_SEQ_APB_BUS_WIDTH_MASK 0x7 +#define APBDMACHAN_APB_SEQ_APB_BUS_WIDTH_SHIFT 28 +#define APBDMACHAN_APB_SEQ_APB_DATA_SWAP (1 << 27) +#define APBDMACHAN_APB_SEQ_APB_ADDR_WRAP_MASK 0x7 +#define APBDMACHAN_APB_SEQ_APB_ADDR_WRAP_SHIFT 16 + +#define APBDMACHAN_WORD_TRANSFER_ + +#define APBDMACHAN_WORD_TRANSFER_MASK 0x0fffffff +#define APBDMACHAN_WORD_TRANSFER_SHIFT 2 + +#define APB_DMA_OFFSET(n) \ + (struct apb_dma_channel_regs *)(TEGRA_APB_DMA_BASE + n) +struct apb_dma_channel apb_dma_channels[] = { + { .num = 0, .regs = APB_DMA_OFFSET(0x1000) }, + { .num = 1, .regs = APB_DMA_OFFSET(0x1040) }, + { .num = 2, .regs = APB_DMA_OFFSET(0x1080) }, + { .num = 3, .regs = APB_DMA_OFFSET(0x10c0) }, + { .num = 4, .regs = APB_DMA_OFFSET(0x1100) }, + { .num = 5, .regs = APB_DMA_OFFSET(0x1140) }, + { .num = 6, .regs = APB_DMA_OFFSET(0x1180) }, + { .num = 7, .regs = APB_DMA_OFFSET(0x11c0) }, + { .num = 8, .regs = APB_DMA_OFFSET(0x1200) }, + { .num = 9, .regs = APB_DMA_OFFSET(0x1240) }, + { .num = 10, .regs = APB_DMA_OFFSET(0x1280) }, + { .num = 11, .regs = APB_DMA_OFFSET(0x12c0) }, + { .num = 12, .regs = APB_DMA_OFFSET(0x1300) }, + { .num = 13, .regs = APB_DMA_OFFSET(0x1340) }, + { .num = 14, .regs = APB_DMA_OFFSET(0x1380) }, + { .num = 15, .regs = APB_DMA_OFFSET(0x13c0) }, + { .num = 16, .regs = APB_DMA_OFFSET(0x1400) }, + { .num = 17, .regs = APB_DMA_OFFSET(0x1440) }, + { .num = 18, .regs = APB_DMA_OFFSET(0x1480) }, + { .num = 19, .regs = APB_DMA_OFFSET(0x14c0) }, + { .num = 20, .regs = APB_DMA_OFFSET(0x1500) }, + { .num = 21, .regs = APB_DMA_OFFSET(0x1540) }, + { .num = 22, .regs = APB_DMA_OFFSET(0x1580) }, + { .num = 23, .regs = APB_DMA_OFFSET(0x15c0) }, + { .num = 24, .regs = APB_DMA_OFFSET(0x1600) }, + { .num = 25, .regs = APB_DMA_OFFSET(0x1640) }, + { .num = 26, .regs = APB_DMA_OFFSET(0x1680) }, + { .num = 27, .regs = APB_DMA_OFFSET(0x16c0) }, + { .num = 28, .regs = APB_DMA_OFFSET(0x1700) }, + { .num = 29, .regs = APB_DMA_OFFSET(0x1740) }, + { .num = 30, .regs = APB_DMA_OFFSET(0x1780) }, + { .num = 31, .regs = APB_DMA_OFFSET(0x17c0) }, +}; + +int dma_busy(struct apb_dma_channel * const channel) +{ + /* + * In continuous mode, the BSY_n bit in APB_DMA_STATUS and + * BSY in APBDMACHAN_CHANNEL_n_STA_0 will remain set as '1' so long + * as the channel is enabled. So for this function we'll use the + * DMA_ACTIVITY bit. + */ + return read32(&channel->regs->sta) & APBDMACHAN_STA_DMA_ACTIVITY ? 1 : 0; +} +/* claim a DMA channel */ +struct apb_dma_channel * const dma_claim(void) +{ + int i; + struct apb_dma_channel_regs *regs = NULL; + + /* + * Set global enable bit, otherwise register access to channel + * DMA registers will not be possible. + */ + setbits_le32(&apb_dma->command, APBDMA_COMMAND_GEN); + + for (i = 0; i < ARRAY_SIZE(apb_dma_channels); i++) { + regs = apb_dma_channels[i].regs; + + if (!apb_dma_channels[i].in_use) { + u32 status = read32(®s->sta); + if (status & (1 << i)) { + /* FIXME: should this be fatal? */ + printk(BIOS_DEBUG, "%s: DMA channel %d busy?\n", + __func__, i); + } + break; + } + } + + if (i == ARRAY_SIZE(apb_dma_channels)) + return NULL; + + apb_dma_channels[i].in_use = 1; + return &apb_dma_channels[i]; +} + +/* release a DMA channel */ +void dma_release(struct apb_dma_channel * const channel) +{ + int i; + + /* FIXME: make this "thread" friendly */ + while (dma_busy(channel)) + ; + + channel->in_use = 0; + + /* clear the global enable bit if no channels are in use */ + for (i = 0; i < ARRAY_SIZE(apb_dma_channels); i++) { + if (apb_dma_channels[i].in_use) + return; + } + + clrbits_le32(&apb_dma->command, APBDMA_COMMAND_GEN); +} + +int dma_start(struct apb_dma_channel * const channel) +{ + struct apb_dma_channel_regs *regs = channel->regs; + + /* Set ENB bit for this channel */ + setbits_le32(®s->csr, APBDMACHAN_CSR_ENB); + + return 0; +} + +int dma_stop(struct apb_dma_channel * const channel) +{ + struct apb_dma_channel_regs *regs = channel->regs; + + /* Clear ENB bit for this channel */ + clrbits_le32(®s->csr, APBDMACHAN_CSR_ENB); + + return 0; +} |