/* * drivers/dma/imx-sdma.c * * This file contains a driver for the Freescale Smart DMA engine * * Copyright 2010 Sascha Hauer, Pengutronix * * Based on code from Freescale: * * Copyright 2004-2015 Freescale Semiconductor, Inc. All Rights Reserved. * * The code contained herein is licensed under the GNU General Public * License. You may obtain a copy of the GNU General Public License * Version 2 or later at the following locations: * * http://www.opensource.org/licenses/gpl-license.html * http://www.gnu.org/copyleft/gpl.html */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dmaengine.h" /* SDMA registers */ #define SDMA_H_C0PTR 0x000 #define SDMA_H_INTR 0x004 #define SDMA_H_STATSTOP 0x008 #define SDMA_H_START 0x00c #define SDMA_H_EVTOVR 0x010 #define SDMA_H_DSPOVR 0x014 #define SDMA_H_HOSTOVR 0x018 #define SDMA_H_EVTPEND 0x01c #define SDMA_H_DSPENBL 0x020 #define SDMA_H_RESET 0x024 #define SDMA_H_EVTERR 0x028 #define SDMA_H_INTRMSK 0x02c #define SDMA_H_PSW 0x030 #define SDMA_H_EVTERRDBG 0x034 #define SDMA_H_CONFIG 0x038 #define SDMA_ONCE_ENB 0x040 #define SDMA_ONCE_DATA 0x044 #define SDMA_ONCE_INSTR 0x048 #define SDMA_ONCE_STAT 0x04c #define SDMA_ONCE_CMD 0x050 #define SDMA_EVT_MIRROR 0x054 #define SDMA_ILLINSTADDR 0x058 #define SDMA_CHN0ADDR 0x05c #define SDMA_ONCE_RTB 0x060 #define SDMA_XTRIG_CONF1 0x070 #define SDMA_XTRIG_CONF2 0x074 #define SDMA_CHNENBL0_IMX35 0x200 #define SDMA_CHNENBL0_IMX31 0x080 #define SDMA_CHNPRI_0 0x100 /* * Buffer descriptor status values. */ #define BD_DONE 0x01 #define BD_WRAP 0x02 #define BD_CONT 0x04 #define BD_INTR 0x08 #define BD_RROR 0x10 #define BD_LAST 0x20 #define BD_EXTD 0x80 /* * Data Node descriptor status values. */ #define DND_END_OF_FRAME 0x80 #define DND_END_OF_XFER 0x40 #define DND_DONE 0x20 #define DND_UNUSED 0x01 /* * IPCV2 descriptor status values. */ #define BD_IPCV2_END_OF_FRAME 0x40 #define IPCV2_MAX_NODES 50 /* * Error bit set in the CCB status field by the SDMA, * in setbd routine, in case of a transfer error */ #define DATA_ERROR 0x10000000 /* * Buffer descriptor commands. */ #define C0_ADDR 0x01 #define C0_LOAD 0x02 #define C0_DUMP 0x03 #define C0_SETCTX 0x07 #define C0_GETCTX 0x03 #define C0_SETDM 0x01 #define C0_SETPM 0x04 #define C0_GETDM 0x02 #define C0_GETPM 0x08 /* * Change endianness indicator in the BD command field */ #define CHANGE_ENDIANNESS 0x80 /* * Mode/Count of data node descriptors - IPCv2 */ struct sdma_mode_count { u32 count : 16; /* size of the buffer pointed by this BD */ u32 status : 8; /* E,R,I,C,W,D status bits stored here */ u32 command : 8; /* command mostlky used for channel 0 */ }; /* * Buffer descriptor */ struct sdma_buffer_descriptor { struct sdma_mode_count mode; u32 buffer_addr; /* address of the buffer described */ u32 ext_buffer_addr; /* extended buffer address */ } __attribute__ ((packed)); /** * struct sdma_channel_control - Channel control Block * * @current_bd_ptr current buffer descriptor processed * @base_bd_ptr first element of buffer descriptor array * @unused padding. The SDMA engine expects an array of 128 byte * control blocks */ struct sdma_channel_control { u32 current_bd_ptr; u32 base_bd_ptr; u32 unused[2]; } __attribute__ ((packed)); /** * struct sdma_state_registers - SDMA context for a channel * * @pc: program counter * @t: test bit: status of arithmetic & test instruction * @rpc: return program counter * @sf: source fault while loading data * @spc: loop start program counter * @df: destination fault while storing data * @epc: loop end program counter * @lm: loop mode */ struct sdma_state_registers { u32 pc :14; u32 unused1: 1; u32 t : 1; u32 rpc :14; u32 unused0: 1; u32 sf : 1; u32 spc :14; u32 unused2: 1; u32 df : 1; u32 epc :14; u32 lm : 2; } __attribute__ ((packed)); /** * struct sdma_context_data - sdma context specific to a channel * * @channel_state: channel state bits * @gReg: general registers * @mda: burst dma destination address register * @msa: burst dma source address register * @ms: burst dma status register * @md: burst dma data register * @pda: peripheral dma destination address register * @psa: peripheral dma source address register * @ps: peripheral dma status register * @pd: peripheral dma data register * @ca: CRC polynomial register * @cs: CRC accumulator register * @dda: dedicated core destination address register * @dsa: dedicated core source address register * @ds: dedicated core status register * @dd: dedicated core data register */ struct sdma_context_data { struct sdma_state_registers channel_state; u32 gReg[8]; u32 mda; u32 msa; u32 ms; u32 md; u32 pda; u32 psa; u32 ps; u32 pd; u32 ca; u32 cs; u32 dda; u32 dsa; u32 ds; u32 dd; u32 scratch0; u32 scratch1; u32 scratch2; u32 scratch3; u32 scratch4; u32 scratch5; u32 scratch6; u32 scratch7; } __attribute__ ((packed)); #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) #define SDMA_BD_MAX_CNT 0xfffc /* align with 4 bytes */ struct sdma_engine; /** * struct sdma_channel - housekeeping for a SDMA channel * * @sdma pointer to the SDMA engine for this channel * @channel the channel number, matches dmaengine chan_id + 1 * @direction transfer type. Needed for setting SDMA script * @peripheral_type Peripheral type. Needed for setting SDMA script * @event_id0 aka dma request line * @event_id1 for channels that use 2 events * @word_size peripheral access size * @buf_tail ID of the buffer that was processed * @num_bd max NUM_BD. number of descriptors currently handling * @bd_iram flag indicating the memory location of buffer descriptor */ struct sdma_channel { struct sdma_engine *sdma; unsigned int channel; enum dma_transfer_direction direction; enum sdma_peripheral_type peripheral_type; unsigned int event_id0; unsigned int event_id1; enum dma_slave_buswidth word_size; unsigned int buf_tail; unsigned int num_bd; unsigned int period_len; struct sdma_buffer_descriptor *bd; dma_addr_t bd_phys; bool bd_iram; unsigned int pc_from_device, pc_to_device; unsigned int device_to_device; unsigned int pc_to_pc; unsigned long flags; dma_addr_t per_address, per_address2; unsigned long event_mask[2]; unsigned long watermark_level; u32 shp_addr, per_addr; struct dma_chan chan; spinlock_t lock; struct dma_async_tx_descriptor desc; enum dma_status status; unsigned int chn_count; unsigned int chn_real_count; struct tasklet_struct tasklet; struct imx_dma_data data; bool src_dualfifo; bool dst_dualfifo; }; #define IMX_DMA_SG_LOOP BIT(0) #define MAX_DMA_CHANNELS 32 #define MXC_SDMA_DEFAULT_PRIORITY 1 #define MXC_SDMA_MIN_PRIORITY 1 #define MXC_SDMA_MAX_PRIORITY 7 /* * 0x78(SDMA_XTRIG_CONF2+4)~0x100(SDMA_CHNPRI_O) registers are reserved and * can't be accessed. Skip these register touch in suspend/resume. Also below * two macros are only used on i.mx6sx. */ #define MXC_SDMA_RESERVED_REG (SDMA_CHNPRI_0 - SDMA_XTRIG_CONF2 - 4) #define MXC_SDMA_SAVED_REG_NUM (((SDMA_CHNENBL0_IMX35 + 4 * 48) - \ MXC_SDMA_RESERVED_REG) / 4) #define SDMA_FIRMWARE_MAGIC 0x414d4453 /** * struct sdma_firmware_header - Layout of the firmware image * * @magic "SDMA" * @version_major increased whenever layout of struct sdma_script_start_addrs * changes. * @version_minor firmware minor version (for binary compatible changes) * @script_addrs_start offset of struct sdma_script_start_addrs in this image * @num_script_addrs Number of script addresses in this image * @ram_code_start offset of SDMA ram image in this firmware image * @ram_code_size size of SDMA ram image * @script_addrs Stores the start address of the SDMA scripts * (in SDMA memory space) */ struct sdma_firmware_header { u32 magic; u32 version_major; u32 version_minor; u32 script_addrs_start; u32 num_script_addrs; u32 ram_code_start; u32 ram_code_size; }; struct sdma_driver_data { int chnenbl0; int num_events; struct sdma_script_start_addrs *script_addrs; }; struct sdma_engine { struct device *dev; struct device_dma_parameters dma_parms; struct sdma_channel channel[MAX_DMA_CHANNELS]; struct sdma_channel_control *channel_control; u32 save_regs[MXC_SDMA_SAVED_REG_NUM]; const char *fw_name; void __iomem *regs; struct sdma_context_data *context; dma_addr_t context_phys; struct dma_device dma_device; struct clk *clk_ipg; struct clk *clk_ahb; spinlock_t channel_0_lock; u32 script_number; struct sdma_script_start_addrs *script_addrs; const struct sdma_driver_data *drvdata; struct gen_pool *iram_pool; u32 spba_start_addr; u32 spba_end_addr; bool suspend_off; }; static struct sdma_driver_data sdma_imx31 = { .chnenbl0 = SDMA_CHNENBL0_IMX31, .num_events = 32, }; static struct sdma_script_start_addrs sdma_script_imx25 = { .ap_2_ap_addr = 729, .uart_2_mcu_addr = 904, .per_2_app_addr = 1255, .mcu_2_app_addr = 834, .uartsh_2_mcu_addr = 1120, .per_2_shp_addr = 1329, .mcu_2_shp_addr = 1048, .ata_2_mcu_addr = 1560, .mcu_2_ata_addr = 1479, .app_2_per_addr = 1189, .app_2_mcu_addr = 770, .shp_2_per_addr = 1407, .shp_2_mcu_addr = 979, }; static struct sdma_driver_data sdma_imx25 = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx25, }; static struct sdma_driver_data sdma_imx35 = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, }; static struct sdma_script_start_addrs sdma_script_imx51 = { .ap_2_ap_addr = 642, .uart_2_mcu_addr = 817, .mcu_2_app_addr = 747, .mcu_2_shp_addr = 961, .ata_2_mcu_addr = 1473, .mcu_2_ata_addr = 1392, .app_2_per_addr = 1033, .app_2_mcu_addr = 683, .shp_2_per_addr = 1251, .shp_2_mcu_addr = 892, }; static struct sdma_driver_data sdma_imx51 = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx51, }; static struct sdma_script_start_addrs sdma_script_imx53 = { .ap_2_ap_addr = 642, .app_2_mcu_addr = 683, .mcu_2_app_addr = 747, .uart_2_mcu_addr = 817, .shp_2_mcu_addr = 891, .mcu_2_shp_addr = 960, .uartsh_2_mcu_addr = 1032, .spdif_2_mcu_addr = 1100, .mcu_2_spdif_addr = 1134, .firi_2_mcu_addr = 1193, .mcu_2_firi_addr = 1290, }; static struct sdma_driver_data sdma_imx53 = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx53, }; static struct sdma_script_start_addrs sdma_script_imx6q = { .ap_2_ap_addr = 642, .uart_2_mcu_addr = 817, .mcu_2_app_addr = 747, .uartsh_2_mcu_addr = 1032, .mcu_2_shp_addr = 960, .app_2_mcu_addr = 683, .shp_2_mcu_addr = 891, .spdif_2_mcu_addr = 1100, .mcu_2_spdif_addr = 1134, }; static struct sdma_driver_data sdma_imx6q = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx6q, }; static struct sdma_script_start_addrs sdma_script_imx6sx = { .ap_2_ap_addr = 642, .uart_2_mcu_addr = 817, .mcu_2_app_addr = 747, .uartsh_2_mcu_addr = 1032, .mcu_2_shp_addr = 960, .app_2_mcu_addr = 683, .shp_2_mcu_addr = 891, .spdif_2_mcu_addr = 1100, .mcu_2_spdif_addr = 1134, }; static struct sdma_driver_data sdma_imx6sx = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx6sx, }; static struct sdma_script_start_addrs sdma_script_imx7d = { .ap_2_ap_addr = 644, .uart_2_mcu_addr = 819, .mcu_2_app_addr = 749, .uartsh_2_mcu_addr = 1034, .mcu_2_shp_addr = 962, .app_2_mcu_addr = 685, .shp_2_mcu_addr = 893, .spdif_2_mcu_addr = 1102, .mcu_2_spdif_addr = 1136, }; static struct sdma_driver_data sdma_imx7d = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, .script_addrs = &sdma_script_imx7d, }; static struct platform_device_id sdma_devtypes[] = { { .name = "imx25-sdma", .driver_data = (unsigned long)&sdma_imx25, }, { .name = "imx31-sdma", .driver_data = (unsigned long)&sdma_imx31, }, { .name = "imx35-sdma", .driver_data = (unsigned long)&sdma_imx35, }, { .name = "imx51-sdma", .driver_data = (unsigned long)&sdma_imx51, }, { .name = "imx53-sdma", .driver_data = (unsigned long)&sdma_imx53, }, { .name = "imx6q-sdma", .driver_data = (unsigned long)&sdma_imx6q, }, { .name = "imx6sx-sdma", .driver_data = (unsigned long)&sdma_imx6sx, }, { .name = "imx7d-sdma", .driver_data = (unsigned long)&sdma_imx7d, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, sdma_devtypes); static const struct of_device_id sdma_dt_ids[] = { { .compatible = "fsl,imx6sx-sdma", .data = &sdma_imx6sx, }, { .compatible = "fsl,imx7d-sdma", .data = &sdma_imx7d, }, { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, }, { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, }, { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, }, { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, }, { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sdma_dt_ids); #define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */ #define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */ #define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */ #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) { u32 chnenbl0 = sdma->drvdata->chnenbl0; return chnenbl0 + event * 4; } static int sdma_config_ownership(struct sdma_channel *sdmac, bool event_override, bool mcu_override, bool dsp_override) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; unsigned long evt, mcu, dsp; if (event_override && mcu_override && dsp_override) return -EINVAL; evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR); mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR); dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR); if (dsp_override) __clear_bit(channel, &dsp); else __set_bit(channel, &dsp); if (event_override) __clear_bit(channel, &evt); else __set_bit(channel, &evt); if (mcu_override) __clear_bit(channel, &mcu); else __set_bit(channel, &mcu); writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR); writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR); writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR); return 0; } static void sdma_enable_channel(struct sdma_engine *sdma, int channel) { writel(BIT(channel), sdma->regs + SDMA_H_START); } /* * sdma_run_channel0 - run a channel and wait till it's done */ static int sdma_run_channel0(struct sdma_engine *sdma) { int ret; unsigned long timeout = 500; sdma_enable_channel(sdma, 0); while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) { if (timeout-- <= 0) break; udelay(1); } if (ret) { /* Clear the interrupt status */ writel_relaxed(ret, sdma->regs + SDMA_H_INTR); } else { dev_err(sdma->dev, "Timeout waiting for CH0 ready\n"); } /* Set bits of CONFIG register with dynamic context switching */ if (readl(sdma->regs + SDMA_H_CONFIG) == 0) writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); return ret ? 0 : -ETIMEDOUT; } static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, u32 address) { struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; void *buf_virt; dma_addr_t buf_phys; int ret; unsigned long flags; bool use_iram = true; buf_virt = gen_pool_dma_alloc(sdma->iram_pool, size, &buf_phys); if (!buf_virt) { use_iram = false; buf_virt = dma_alloc_coherent(NULL, size, &buf_phys, GFP_KERNEL); if (!buf_virt) return -ENOMEM; } spin_lock_irqsave(&sdma->channel_0_lock, flags); bd0->mode.command = C0_SETPM; bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; bd0->mode.count = size / 2; bd0->buffer_addr = buf_phys; bd0->ext_buffer_addr = address; memcpy(buf_virt, buf, size); ret = sdma_run_channel0(sdma); spin_unlock_irqrestore(&sdma->channel_0_lock, flags); if (use_iram) gen_pool_free(sdma->iram_pool, (unsigned long)buf_virt, size); else dma_free_coherent(NULL, size, buf_virt, buf_phys); return ret; } static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; unsigned long val; u32 chnenbl = chnenbl_ofs(sdma, event); val = readl_relaxed(sdma->regs + chnenbl); __set_bit(channel, &val); writel_relaxed(val, sdma->regs + chnenbl); } static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; u32 chnenbl = chnenbl_ofs(sdma, event); unsigned long val; val = readl_relaxed(sdma->regs + chnenbl); __clear_bit(channel, &val); writel_relaxed(val, sdma->regs + chnenbl); } static void sdma_handle_channel_loop(struct sdma_channel *sdmac) { if (sdmac->desc.callback) sdmac->desc.callback(sdmac->desc.callback_param); } static void sdma_update_channel_loop(struct sdma_channel *sdmac) { struct sdma_buffer_descriptor *bd; /* * loop mode. Iterate over descriptors, re-setup them and * call callback function. */ while (1) { bd = &sdmac->bd[sdmac->buf_tail]; if (bd->mode.status & BD_DONE) break; if (bd->mode.status & BD_RROR) sdmac->status = DMA_ERROR; bd->mode.status |= BD_DONE; sdmac->buf_tail++; sdmac->buf_tail %= sdmac->num_bd; if (sdmac->peripheral_type == IMX_DMATYPE_UART) { /* restore mode.count after counter readed */ sdmac->chn_real_count = bd->mode.count; bd->mode.count = sdmac->chn_count; } sdma_handle_channel_loop(sdmac); } } static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac) { struct sdma_buffer_descriptor *bd; int i, error = 0; sdmac->chn_real_count = 0; /* * non loop mode. Iterate over all descriptors, collect * errors and call callback function */ for (i = 0; i < sdmac->num_bd; i++) { bd = &sdmac->bd[i]; if (bd->mode.status & (BD_DONE | BD_RROR)) error = -EIO; sdmac->chn_real_count += bd->mode.count; } if (error) sdmac->status = DMA_ERROR; else sdmac->status = DMA_COMPLETE; dma_cookie_complete(&sdmac->desc); if (sdmac->desc.callback) sdmac->desc.callback(sdmac->desc.callback_param); } static void sdma_tasklet(unsigned long data) { struct sdma_channel *sdmac = (struct sdma_channel *) data; unsigned long flags; spin_lock_irqsave(&sdmac->lock, flags); if (sdmac->status != DMA_IN_PROGRESS) { spin_unlock_irqrestore(&sdmac->lock, flags); return; } spin_unlock_irqrestore(&sdmac->lock, flags); if (sdmac->flags & IMX_DMA_SG_LOOP) { if (sdmac->peripheral_type != IMX_DMATYPE_HDMI) sdma_update_channel_loop(sdmac); else sdma_handle_channel_loop(sdmac); } else mxc_sdma_handle_channel_normal(sdmac); } static irqreturn_t sdma_int_handler(int irq, void *dev_id) { struct sdma_engine *sdma = dev_id; unsigned long stat, flags; stat = readl_relaxed(sdma->regs + SDMA_H_INTR); /* not interested in channel 0 interrupts */ stat &= ~1; writel_relaxed(stat, sdma->regs + SDMA_H_INTR); while (stat) { int channel = fls(stat) - 1; struct sdma_channel *sdmac = &sdma->channel[channel]; spin_lock_irqsave(&sdmac->lock, flags); if (sdmac->status == DMA_IN_PROGRESS) tasklet_schedule(&sdmac->tasklet); spin_unlock_irqrestore(&sdmac->lock, flags); __clear_bit(channel, &stat); } return IRQ_HANDLED; } /* * sets the pc of SDMA script according to the peripheral type */ static void sdma_get_pc(struct sdma_channel *sdmac, enum sdma_peripheral_type peripheral_type) { struct sdma_engine *sdma = sdmac->sdma; int per_2_emi = 0, emi_2_per = 0; /* * These are needed once we start to support transfers between * two peripherals or memory-to-memory transfers */ int per_2_per = 0, emi_2_emi = 0; sdmac->pc_from_device = 0; sdmac->pc_to_device = 0; sdmac->device_to_device = 0; sdmac->pc_to_pc = 0; switch (peripheral_type) { case IMX_DMATYPE_MEMORY: emi_2_emi = sdma->script_addrs->ap_2_ap_addr; break; case IMX_DMATYPE_DSP: emi_2_per = sdma->script_addrs->bp_2_ap_addr; per_2_emi = sdma->script_addrs->ap_2_bp_addr; break; case IMX_DMATYPE_FIRI: per_2_emi = sdma->script_addrs->firi_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_firi_addr; break; case IMX_DMATYPE_UART: per_2_emi = sdma->script_addrs->uart_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_app_addr; break; case IMX_DMATYPE_UART_SP: per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_shp_addr; break; case IMX_DMATYPE_ATA: per_2_emi = sdma->script_addrs->ata_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_ata_addr; break; case IMX_DMATYPE_CSPI: per_2_emi = sdma->script_addrs->app_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_ecspi_addr; break; case IMX_DMATYPE_EXT: case IMX_DMATYPE_SSI: case IMX_DMATYPE_SAI: per_2_emi = sdma->script_addrs->app_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_app_addr; break; case IMX_DMATYPE_SSI_DUAL: per_2_emi = sdma->script_addrs->ssish_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_ssish_addr; break; case IMX_DMATYPE_SSI_SP: case IMX_DMATYPE_MMC: case IMX_DMATYPE_SDHC: case IMX_DMATYPE_CSPI_SP: case IMX_DMATYPE_ESAI: case IMX_DMATYPE_MSHC_SP: per_2_emi = sdma->script_addrs->shp_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_shp_addr; break; case IMX_DMATYPE_ASRC: per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; per_2_per = sdma->script_addrs->per_2_per_addr; break; case IMX_DMATYPE_ASRC_SP: per_2_emi = sdma->script_addrs->shp_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_shp_addr; per_2_per = sdma->script_addrs->per_2_per_addr; break; case IMX_DMATYPE_MSHC: per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; break; case IMX_DMATYPE_CCM: per_2_emi = sdma->script_addrs->dptc_dvfs_addr; break; case IMX_DMATYPE_SPDIF: per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; break; case IMX_DMATYPE_IPU_MEMORY: emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; break; case IMX_DMATYPE_HDMI: emi_2_per = sdma->script_addrs->hdmi_dma_addr; break; default: break; } sdmac->pc_from_device = per_2_emi; sdmac->pc_to_device = emi_2_per; sdmac->device_to_device = per_2_per; sdmac->pc_to_pc = emi_2_emi; } static int sdma_load_context(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; int load_address; struct sdma_context_data *context = sdma->context; struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; int ret; unsigned long flags; if (sdmac->direction == DMA_DEV_TO_MEM) load_address = sdmac->pc_from_device; else if (sdmac->direction == DMA_DEV_TO_DEV) load_address = sdmac->device_to_device; else if (sdmac->direction == DMA_MEM_TO_MEM) load_address = sdmac->pc_to_pc; else load_address = sdmac->pc_to_device; if (load_address < 0) return load_address; dev_dbg(sdma->dev, "load_address = %d\n", load_address); dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level); dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]); dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]); spin_lock_irqsave(&sdma->channel_0_lock, flags); memset(context, 0, sizeof(*context)); context->channel_state.pc = load_address; /* Send by context the event mask,base address for peripheral * and watermark level */ if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) { context->gReg[4] = sdmac->per_addr; context->gReg[6] = sdmac->shp_addr; } else { context->gReg[0] = sdmac->event_mask[1]; context->gReg[1] = sdmac->event_mask[0]; context->gReg[2] = sdmac->per_addr; context->gReg[6] = sdmac->shp_addr; context->gReg[7] = sdmac->watermark_level; } bd0->mode.command = C0_SETDM; bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; bd0->mode.count = sizeof(*context) / 4; bd0->buffer_addr = sdma->context_phys; bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; ret = sdma_run_channel0(sdma); spin_unlock_irqrestore(&sdma->channel_0_lock, flags); return ret; } static void sdma_disable_channel(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; unsigned long flags; spin_lock_irqsave(&sdmac->lock, flags); sdmac->status = DMA_ERROR; spin_unlock_irqrestore(&sdmac->lock, flags); writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP); } static int sdma_pause_channel(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; unsigned long flags; if (!(sdmac->flags & IMX_DMA_SG_LOOP)) return -EINVAL; writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP); spin_lock_irqsave(&sdmac->lock, flags); sdmac->status = DMA_PAUSED; spin_unlock_irqrestore(&sdmac->lock, flags); return 0; } static int sdma_resume_channel(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; unsigned long flags; if (!(sdmac->flags & IMX_DMA_SG_LOOP)) return -EINVAL; /* * restore back context since context may loss if mega/fast OFF */ if (sdma->suspend_off) { if (sdma_load_context(sdmac)) { dev_err(sdmac->sdma->dev, "context load failed.\n"); return -EINVAL; } } sdma_enable_channel(sdmac->sdma, sdmac->channel); spin_lock_irqsave(&sdmac->lock, flags); sdmac->status = DMA_IN_PROGRESS; spin_unlock_irqrestore(&sdmac->lock, flags); return 0; } static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; int lwml = sdmac->watermark_level & 0xff; int hwml = (sdmac->watermark_level >> 16) & 0xff; if (sdmac->event_id0 > 31) { sdmac->event_mask[0] |= 0; __set_bit(28, &sdmac->watermark_level); sdmac->event_mask[1] |= BIT(sdmac->event_id0 % 32); } else { sdmac->event_mask[0] |= 0; sdmac->event_mask[1] |= BIT(sdmac->event_id0 % 32); } if (sdmac->event_id1 > 31) { sdmac->event_mask[1] |= 0; __set_bit(29, &sdmac->watermark_level); sdmac->event_mask[0] |= BIT(sdmac->event_id1 % 32); } else { sdmac->event_mask[1] |= 0; sdmac->event_mask[0] |= BIT(sdmac->event_id1 % 32); } /* * If LWML(src_maxburst) > HWML(dst_maxburst), we need * swap LWML and HWML of INFO(A.3.2.5.1), also need swap * r0(event_mask[1]) and r1(event_mask[0]). */ if (lwml > hwml) { sdmac->watermark_level &= ~0xff00ff; sdmac->watermark_level |= hwml; sdmac->watermark_level |= lwml << 16; swap(sdmac->event_mask[0], sdmac->event_mask[1]); } /* BIT 11: * 1 : Source on SPBA * 0 : Source on AIPS */ if (sdmac->per_address >= sdma->spba_start_addr && sdmac->per_address <= sdma->spba_end_addr) __set_bit(11, &sdmac->watermark_level); /* BIT 12: * 1 : Destination on SPBA * 0 : Destination on AIPS */ if (sdmac->per_address2 >= sdma->spba_start_addr && sdmac->per_address2 <= sdma->spba_end_addr) __set_bit(12, &sdmac->watermark_level); if (sdmac->src_dualfifo) __set_bit(13, &sdmac->watermark_level); if (sdmac->dst_dualfifo) __set_bit(14, &sdmac->watermark_level); __set_bit(31, &sdmac->watermark_level); /* BIT 31: * 1 : Amount of samples to be transferred is * unknown and script will keep on transferring * samples as long as both events are detected * and script must be manually stopped by the * application. * 0 : The amount of samples to be is equal to * the count field of mode word * */ __set_bit(25, &sdmac->watermark_level); __clear_bit(24, &sdmac->watermark_level); } static int sdma_config_channel(struct sdma_channel *sdmac) { int ret; sdma_disable_channel(sdmac); sdmac->event_mask[0] = 0; sdmac->event_mask[1] = 0; sdmac->shp_addr = 0; sdmac->per_addr = 0; if (sdmac->event_id0 >= 0) { if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events) return -EINVAL; sdma_event_enable(sdmac, sdmac->event_id0); } if (sdmac->event_id1) { if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events) return -EINVAL; sdma_event_enable(sdmac, sdmac->event_id1); } switch (sdmac->peripheral_type) { case IMX_DMATYPE_DSP: sdma_config_ownership(sdmac, false, true, true); break; case IMX_DMATYPE_MEMORY: sdma_config_ownership(sdmac, false, true, false); break; default: sdma_config_ownership(sdmac, true, true, false); break; } sdma_get_pc(sdmac, sdmac->peripheral_type); if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { /* Handle multiple event channels differently */ if (sdmac->event_id1) { if (sdmac->peripheral_type == IMX_DMATYPE_ASRC_SP || sdmac->peripheral_type == IMX_DMATYPE_ASRC) sdma_set_watermarklevel_for_p2p(sdmac); } else __set_bit(sdmac->event_id0, sdmac->event_mask); /* Watermark Level */ sdmac->watermark_level |= sdmac->watermark_level; /* Address */ if (sdmac->direction == DMA_DEV_TO_DEV || (sdmac->peripheral_type == IMX_DMATYPE_HDMI)) { sdmac->shp_addr = sdmac->per_address2; sdmac->per_addr = sdmac->per_address; } else { sdmac->shp_addr = sdmac->per_address; } } else { sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ } ret = sdma_load_context(sdmac); return ret; } static int sdma_set_channel_priority(struct sdma_channel *sdmac, unsigned int priority) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; if (priority < MXC_SDMA_MIN_PRIORITY || priority > MXC_SDMA_MAX_PRIORITY) { return -EINVAL; } writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); return 0; } static int sdma_request_channel(struct sdma_channel *sdmac) { struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; int ret = -EBUSY; sdmac->bd_iram = true; sdmac->bd = gen_pool_dma_alloc(sdma->iram_pool, PAGE_SIZE, &sdmac->bd_phys); if (!sdmac->bd) { sdmac->bd_iram = false; sdmac->bd = dma_alloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, GFP_KERNEL); if (!sdmac->bd) { ret = -ENOMEM; goto out; } } memset(sdmac->bd, 0, PAGE_SIZE); sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys; sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY); return 0; out: return ret; } static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) { return container_of(chan, struct sdma_channel, chan); } static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) { unsigned long flags; struct sdma_channel *sdmac = to_sdma_chan(tx->chan); dma_cookie_t cookie; spin_lock_irqsave(&sdmac->lock, flags); cookie = dma_cookie_assign(tx); spin_unlock_irqrestore(&sdmac->lock, flags); return cookie; } static int sdma_alloc_chan_resources(struct dma_chan *chan) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct imx_dma_data *data = chan->private; int prio, ret; if (!data) return -EINVAL; switch (data->priority) { case DMA_PRIO_HIGH: prio = 3; break; case DMA_PRIO_MEDIUM: prio = 2; break; case DMA_PRIO_LOW: default: prio = 1; break; } sdmac->peripheral_type = data->peripheral_type; sdmac->event_id0 = data->dma_request; sdmac->event_id1 = data->dma_request2; sdmac->src_dualfifo = data->src_dualfifo; sdmac->dst_dualfifo = data->dst_dualfifo; clk_enable(sdmac->sdma->clk_ipg); clk_enable(sdmac->sdma->clk_ahb); ret = sdma_request_channel(sdmac); if (ret) return ret; ret = sdma_set_channel_priority(sdmac, prio); if (ret) return ret; dma_async_tx_descriptor_init(&sdmac->desc, chan); sdmac->desc.tx_submit = sdma_tx_submit; /* txd.flags will be overwritten in prep funcs */ sdmac->desc.flags = DMA_CTRL_ACK; return 0; } static void sdma_free_chan_resources(struct dma_chan *chan) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; sdma_disable_channel(sdmac); if (sdmac->event_id0 >= 0) sdma_event_disable(sdmac, sdmac->event_id0); if (sdmac->event_id1) sdma_event_disable(sdmac, sdmac->event_id1); sdmac->event_id0 = 0; sdmac->event_id1 = 0; sdma_set_channel_priority(sdmac, 0); if (sdmac->bd_iram) gen_pool_free(sdma->iram_pool, (unsigned long)sdmac->bd, PAGE_SIZE); else dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys); clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); } static int sdma_transfer_init(struct sdma_channel *sdmac, enum dma_transfer_direction direction) { int ret = 0; sdmac->status = DMA_IN_PROGRESS; sdmac->buf_tail = 0; sdmac->flags = 0; sdmac->direction = direction; ret = sdma_load_context(sdmac); if (ret) return ret; sdmac->chn_count = 0; return ret; } static int check_bd_buswidth(struct sdma_buffer_descriptor *bd, struct sdma_channel *sdmac, int count, dma_addr_t dma_dst, dma_addr_t dma_src) { int ret = 0; switch (sdmac->word_size) { case DMA_SLAVE_BUSWIDTH_4_BYTES: bd->mode.command = 0; if ((count | dma_dst | dma_src) & 3) ret = -EINVAL; break; case DMA_SLAVE_BUSWIDTH_2_BYTES: bd->mode.command = 2; if ((count | dma_dst | dma_src) & 1) ret = -EINVAL; break; case DMA_SLAVE_BUSWIDTH_1_BYTE: bd->mode.command = 1; break; default: return -EINVAL; } return ret; } static struct dma_async_tx_descriptor *sdma_prep_memcpy( struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src, size_t len, unsigned long flags) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; size_t count; int i = 0, param; struct sdma_buffer_descriptor *bd; if (!chan || !len || sdmac->status == DMA_IN_PROGRESS) return NULL; if (len >= NUM_BD * SDMA_BD_MAX_CNT) { dev_err(sdma->dev, "channel%d: maximum bytes exceeded:%zu > %d\n", channel, len, NUM_BD * SDMA_BD_MAX_CNT); goto err_out; } dev_dbg(sdma->dev, "memcpy: %pad->%pad, len=%zu, channel=%d.\n", &dma_src, &dma_dst, len, channel); if (sdma_transfer_init(sdmac, DMA_MEM_TO_MEM)) goto err_out; do { count = min_t(size_t, len, SDMA_BD_MAX_CNT); bd = &sdmac->bd[i]; bd->buffer_addr = dma_src; bd->ext_buffer_addr = dma_dst; bd->mode.count = count; if (check_bd_buswidth(bd, sdmac, count, dma_dst, dma_src)) goto err_out; dma_src += count; dma_dst += count; len -= count; i++; param = BD_DONE | BD_EXTD | BD_CONT; /* last bd */ if (!len) { param |= BD_INTR; param |= BD_LAST; param &= ~BD_CONT; } dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%u %s%s\n", i, count, bd->buffer_addr, param & BD_WRAP ? "wrap" : "", param & BD_INTR ? " intr" : ""); bd->mode.status = param; sdmac->chn_count += count; } while (len); sdmac->num_bd = i; sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; return &sdmac->desc; err_out: sdmac->status = DMA_ERROR; return NULL; } /* * Please ensure dst_nents no smaller than src_nents , also every sg_len of * dst_sg node no smaller than src_sg. To simply things, please use the same * size of dst_sg as src_sg. */ static struct dma_async_tx_descriptor *sdma_prep_sg( struct dma_chan *chan, struct scatterlist *dst_sg, unsigned int dst_nents, struct scatterlist *src_sg, unsigned int src_nents, enum dma_transfer_direction direction) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; int ret, i, count; int channel = sdmac->channel; struct scatterlist *sg_src = src_sg, *sg_dst = dst_sg; if (sdmac->status == DMA_IN_PROGRESS) return NULL; dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", src_nents, channel); if (src_nents > NUM_BD) { dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", channel, src_nents, NUM_BD); ret = -EINVAL; goto err_out; } if (sdma_transfer_init(sdmac, direction)) goto err_out; for_each_sg(src_sg, sg_src, src_nents, i) { struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; int param; bd->buffer_addr = sg_src->dma_address; if (direction == DMA_MEM_TO_MEM) { BUG_ON(!sg_dst); bd->ext_buffer_addr = sg_dst->dma_address; } count = sg_dma_len(sg_src); if (count > SDMA_BD_MAX_CNT) { dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", channel, count, SDMA_BD_MAX_CNT); ret = -EINVAL; goto err_out; } bd->mode.count = count; sdmac->chn_count += count; if (direction == DMA_MEM_TO_MEM) ret = check_bd_buswidth(bd, sdmac, count, sg_dst->dma_address, sg_src->dma_address); else ret = check_bd_buswidth(bd, sdmac, count, 0, sg_src->dma_address); if (ret) goto err_out; param = BD_DONE | BD_EXTD | BD_CONT; if (i + 1 == src_nents) { param |= BD_INTR; param |= BD_LAST; param &= ~BD_CONT; } dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%pad %s%s\n", i, count, &sg_src->dma_address, param & BD_WRAP ? "wrap" : "", param & BD_INTR ? " intr" : ""); bd->mode.status = param; if (direction == DMA_MEM_TO_MEM) sg_dst = sg_next(sg_dst); } sdmac->num_bd = src_nents; sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; return &sdmac->desc; err_out: sdmac->status = DMA_ERROR; return NULL; } static struct dma_async_tx_descriptor *sdma_prep_memcpy_sg( struct dma_chan *chan, struct scatterlist *dst_sg, unsigned int dst_nents, struct scatterlist *src_sg, unsigned int src_nents, unsigned long flags) { return sdma_prep_sg(chan, dst_sg, dst_nents, src_sg, src_nents, DMA_MEM_TO_MEM); } static struct dma_async_tx_descriptor *sdma_prep_slave_sg( struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, unsigned long flags, void *context) { return sdma_prep_sg(chan, NULL, 0, sgl, sg_len, direction); } static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction, unsigned long flags, void *context) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; int channel = sdmac->channel; int ret, i = 0, buf = 0; int num_periods; dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); if (sdmac->status == DMA_IN_PROGRESS) return NULL; sdmac->status = DMA_IN_PROGRESS; sdmac->buf_tail = 0; sdmac->period_len = period_len; sdmac->flags |= IMX_DMA_SG_LOOP; sdmac->direction = direction; ret = sdma_load_context(sdmac); if (ret) goto err_out; if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) return &sdmac->desc; else num_periods = buf_len / period_len; if (num_periods > NUM_BD) { dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", channel, num_periods, NUM_BD); goto err_out; } if (period_len > SDMA_BD_MAX_CNT) { dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n", channel, period_len, SDMA_BD_MAX_CNT); goto err_out; } if (sdmac->peripheral_type == IMX_DMATYPE_UART) sdmac->chn_count = period_len; while (buf < buf_len) { struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; int param; bd->buffer_addr = dma_addr; bd->mode.count = period_len; if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) goto err_out; if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) bd->mode.command = 0; else bd->mode.command = sdmac->word_size; param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; if (i + 1 == num_periods) param |= BD_WRAP; dev_dbg(sdma->dev, "entry %d: count: %d dma: %pad %s%s\n", i, period_len, &dma_addr, param & BD_WRAP ? "wrap" : "", param & BD_INTR ? " intr" : ""); bd->mode.status = param; dma_addr += period_len; buf += period_len; i++; } sdmac->num_bd = num_periods; sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; return &sdmac->desc; err_out: sdmac->status = DMA_ERROR; return NULL; } static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct dma_slave_config *dmaengine_cfg = (void *)arg; switch (cmd) { case DMA_TERMINATE_ALL: sdma_disable_channel(sdmac); return 0; /* only support pause/resume on cyclic mode */ case DMA_PAUSE: return sdma_pause_channel(sdmac); case DMA_RESUME: return sdma_resume_channel(sdmac); case DMA_SLAVE_CONFIG: if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { sdmac->per_address = dmaengine_cfg->src_addr; sdmac->watermark_level = dmaengine_cfg->src_maxburst * dmaengine_cfg->src_addr_width; sdmac->word_size = dmaengine_cfg->src_addr_width; } else if (dmaengine_cfg->direction == DMA_DEV_TO_DEV) { sdmac->per_address = dmaengine_cfg->src_addr; sdmac->per_address2 = dmaengine_cfg->dst_addr; sdmac->watermark_level = dmaengine_cfg->src_maxburst & 0xff; sdmac->watermark_level |= (dmaengine_cfg->dst_maxburst & 0xff) << 16; sdmac->word_size = dmaengine_cfg->dst_addr_width; } else if (dmaengine_cfg->direction == DMA_MEM_TO_DEV) { sdmac->per_address = dmaengine_cfg->dst_addr; sdmac->watermark_level = dmaengine_cfg->dst_maxburst * dmaengine_cfg->dst_addr_width; sdmac->word_size = dmaengine_cfg->dst_addr_width; } else if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) { sdmac->per_address = dmaengine_cfg->src_addr; sdmac->per_address2 = dmaengine_cfg->dst_addr; sdmac->watermark_level = 0; } else if (dmaengine_cfg->direction == DMA_MEM_TO_MEM) { sdmac->word_size = dmaengine_cfg->dst_addr_width; } sdmac->direction = dmaengine_cfg->direction; return sdma_config_channel(sdmac); default: return -ENOSYS; } return -EINVAL; } static enum dma_status sdma_wait_tasklet(struct dma_chan *chan) { struct sdma_channel *sdmac = to_sdma_chan(chan); tasklet_kill(&sdmac->tasklet); return sdmac->status; } static enum dma_status sdma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { struct sdma_channel *sdmac = to_sdma_chan(chan); u32 residue; /* * For uart rx data may not receive fully, use old chn_real_count to * know the real rx count. */ if ((sdmac->flags & IMX_DMA_SG_LOOP) && (sdmac->peripheral_type != IMX_DMATYPE_UART)) residue = (sdmac->num_bd - sdmac->buf_tail) * sdmac->period_len; else residue = sdmac->chn_count - sdmac->chn_real_count; dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, residue); return sdmac->status; } static void sdma_issue_pending(struct dma_chan *chan) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; if (sdmac->status == DMA_IN_PROGRESS) sdma_enable_channel(sdma, sdmac->channel); } #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4 42 static void sdma_add_scripts(struct sdma_engine *sdma, const struct sdma_script_start_addrs *addr) { s32 *addr_arr = (u32 *)addr; s32 *saddr_arr = (u32 *)sdma->script_addrs; int i; /* use the default firmware in ROM if missing external firmware */ if (!sdma->script_number) sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; for (i = 0; i < sdma->script_number; i++) if (addr_arr[i] > 0) saddr_arr[i] = addr_arr[i]; } static void sdma_load_firmware(const struct firmware *fw, void *context) { struct sdma_engine *sdma = context; const struct sdma_firmware_header *header; const struct sdma_script_start_addrs *addr; unsigned short *ram_code; if (!fw) { dev_err(sdma->dev, "firmware not found\n"); return; } if (fw->size < sizeof(*header)) goto err_firmware; header = (struct sdma_firmware_header *)fw->data; if (header->magic != SDMA_FIRMWARE_MAGIC) goto err_firmware; if (header->ram_code_start + header->ram_code_size > fw->size) goto err_firmware; switch (header->version_major) { case 1: sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; break; case 2: sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2; break; case 3: sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3; break; case 4: sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4; break; default: dev_err(sdma->dev, "unknown firmware version\n"); goto err_firmware; } addr = (void *)header + header->script_addrs_start; ram_code = (void *)header + header->ram_code_start; clk_enable(sdma->clk_ipg); clk_enable(sdma->clk_ahb); /* download the RAM image for SDMA */ sdma_load_script(sdma, ram_code, header->ram_code_size, addr->ram_code_start_addr); clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); sdma_add_scripts(sdma, addr); dev_info(sdma->dev, "loaded firmware %d.%d\n", header->version_major, header->version_minor); err_firmware: release_firmware(fw); } #define EVENT_REMAP_CELLS 3 static int __init sdma_event_remap(struct sdma_engine *sdma) { struct device_node *np = sdma->dev->of_node; struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0); struct property *event_remap; struct regmap *gpr; char propname[] = "fsl,sdma-event-remap"; u32 reg, val, shift, num_map, i; int ret = 0; if (IS_ERR(np) || IS_ERR(gpr_np)) goto out; event_remap = of_find_property(np, propname, NULL); num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0; if (!num_map) { dev_warn(sdma->dev, "no event needs to be remapped\n"); goto out; } else if (num_map % EVENT_REMAP_CELLS) { dev_err(sdma->dev, "the property %s must modulo %d\n", propname, EVENT_REMAP_CELLS); ret = -EINVAL; goto out; } gpr = syscon_node_to_regmap(gpr_np); if (IS_ERR(gpr)) { dev_err(sdma->dev, "failed to get gpr regmap\n"); ret = PTR_ERR(gpr); goto out; } for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) { ret = of_property_read_u32_index(np, propname, i, ®); if (ret) { dev_err(sdma->dev, "failed to read property %s index %d\n", propname, i); goto out; } ret = of_property_read_u32_index(np, propname, i + 1, &shift); if (ret) { dev_err(sdma->dev, "failed to read property %s index %d\n", propname, i + 1); goto out; } ret = of_property_read_u32_index(np, propname, i + 2, &val); if (ret) { dev_err(sdma->dev, "failed to read property %s index %d\n", propname, i + 2); goto out; } regmap_update_bits(gpr, reg, BIT(shift), val << shift); } out: if (!IS_ERR(gpr_np)) of_node_put(gpr_np); return ret; } static int sdma_get_firmware(struct sdma_engine *sdma, const char *fw_name) { int ret; ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, fw_name, sdma->dev, GFP_KERNEL, sdma, sdma_load_firmware); return ret; } static int __init sdma_init(struct sdma_engine *sdma) { int i, ret, ccbsize; dma_addr_t ccb_phys; clk_enable(sdma->clk_ipg); clk_enable(sdma->clk_ahb); /* Be sure SDMA has not started yet */ writel_relaxed(0, sdma->regs + SDMA_H_C0PTR); ccbsize = MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + sizeof(struct sdma_context_data); sdma->channel_control = gen_pool_dma_alloc(sdma->iram_pool, ccbsize, &ccb_phys); if (!sdma->channel_control) { sdma->channel_control = dma_alloc_coherent(NULL, ccbsize, &ccb_phys, GFP_KERNEL); if (!sdma->channel_control) { ret = -ENOMEM; goto err_dma_alloc; } } sdma->context = (void *)sdma->channel_control + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); sdma->context_phys = ccb_phys + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); /* Zero-out the CCB structures array just allocated */ memset(sdma->channel_control, 0, MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control)); /* disable all channels */ for (i = 0; i < sdma->drvdata->num_events; i++) writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i)); /* All channels have priority 0 */ for (i = 0; i < MAX_DMA_CHANNELS; i++) writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); ret = sdma_request_channel(&sdma->channel[0]); if (ret) goto err_dma_alloc; sdma_config_ownership(&sdma->channel[0], false, true, false); /* Set Command Channel (Channel Zero) */ writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR); /* Set bits of CONFIG register but with static context switching */ /* FIXME: Check whether to set ACR bit depending on clock ratios */ writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR); /* Initializes channel's priorities */ sdma_set_channel_priority(&sdma->channel[0], 7); clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); return 0; err_dma_alloc: clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); dev_err(sdma->dev, "initialisation failed with %d\n", ret); return ret; } static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct imx_dma_data *data = fn_param; if (!imx_dma_is_general_purpose(chan)) return false; sdmac->data = *data; chan->private = &sdmac->data; return true; } static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { struct sdma_engine *sdma = ofdma->of_dma_data; dma_cap_mask_t mask = sdma->dma_device.cap_mask; struct imx_dma_data data; if (dma_spec->args_count != 3) return NULL; memset(&data, 0, sizeof(data)); data.dma_request = dma_spec->args[0]; data.peripheral_type = dma_spec->args[1]; data.priority = dma_spec->args[2]; return dma_request_channel(mask, sdma_filter_fn, &data); } static int __init sdma_probe(struct platform_device *pdev) { const struct of_device_id *of_id = of_match_device(sdma_dt_ids, &pdev->dev); struct device_node *np = pdev->dev.of_node; struct device_node *spba_bus; const char *fw_name; int ret; int irq; struct resource *iores; struct resource spba_res; struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev); int i; struct sdma_engine *sdma; s32 *saddr_arr; const struct sdma_driver_data *drvdata = NULL; if (of_id) drvdata = of_id->data; else if (pdev->id_entry) drvdata = (void *)pdev->id_entry->driver_data; if (!drvdata) { dev_err(&pdev->dev, "unable to find driver data\n"); return -EINVAL; } ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (ret) return ret; sdma = kzalloc(sizeof(*sdma), GFP_KERNEL); if (!sdma) return -ENOMEM; spin_lock_init(&sdma->channel_0_lock); sdma->dev = &pdev->dev; sdma->drvdata = drvdata; iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); if (!iores || irq < 0) { ret = -EINVAL; goto err_irq; } if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) { ret = -EBUSY; goto err_request_region; } sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(sdma->clk_ipg)) { ret = PTR_ERR(sdma->clk_ipg); goto err_clk; } sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(sdma->clk_ahb)) { ret = PTR_ERR(sdma->clk_ahb); goto err_clk; } clk_prepare(sdma->clk_ipg); clk_prepare(sdma->clk_ahb); sdma->regs = ioremap(iores->start, resource_size(iores)); if (!sdma->regs) { ret = -ENOMEM; goto err_ioremap; } ret = request_irq(irq, sdma_int_handler, 0, "sdma", sdma); if (ret) goto err_request_irq; sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); if (!sdma->script_addrs) { ret = -ENOMEM; goto err_alloc; } /* initially no scripts available */ saddr_arr = (s32 *)sdma->script_addrs; for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) saddr_arr[i] = -EINVAL; dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); dma_cap_set(DMA_MEMCPY, sdma->dma_device.cap_mask); INIT_LIST_HEAD(&sdma->dma_device.channels); /* Initialize channel parameters */ for (i = 0; i < MAX_DMA_CHANNELS; i++) { struct sdma_channel *sdmac = &sdma->channel[i]; sdmac->sdma = sdma; spin_lock_init(&sdmac->lock); sdmac->chan.device = &sdma->dma_device; dma_cookie_init(&sdmac->chan); sdmac->channel = i; tasklet_init(&sdmac->tasklet, sdma_tasklet, (unsigned long) sdmac); /* * Add the channel to the DMAC list. Do not add channel 0 though * because we need it internally in the SDMA driver. This also means * that channel 0 in dmaengine counting matches sdma channel 1. */ if (i) list_add_tail(&sdmac->chan.device_node, &sdma->dma_device.channels); } if (np) sdma->iram_pool = of_get_named_gen_pool(np, "iram", 0); if (!sdma->iram_pool) dev_warn(&pdev->dev, "no iram assigned, using external mem\n"); ret = sdma_init(sdma); if (ret) goto err_init; ret = sdma_event_remap(sdma); if (ret) goto err_init; if (sdma->drvdata->script_addrs) sdma_add_scripts(sdma, sdma->drvdata->script_addrs); if (pdata && pdata->script_addrs) sdma_add_scripts(sdma, pdata->script_addrs); if (pdata) { ret = sdma_get_firmware(sdma, pdata->fw_name); if (ret) dev_warn(&pdev->dev, "failed to get firmware from platform data\n"); } else { /* * Because that device tree does not encode ROM script address, * the RAM script in firmware is mandatory for device tree * probe, otherwise it fails. */ ret = of_property_read_string(np, "fsl,sdma-ram-script-name", &fw_name); if (ret) dev_warn(&pdev->dev, "failed to get firmware name\n"); else { ret = sdma_get_firmware(sdma, fw_name); if (ret) dev_warn(&pdev->dev, "failed to get firmware from device tree\n"); } } sdma->fw_name = fw_name; sdma->dma_device.dev = &pdev->dev; sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; sdma->dma_device.device_tx_status = sdma_tx_status; sdma->dma_device.device_wait_tasklet = sdma_wait_tasklet; sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; sdma->dma_device.device_prep_dma_memcpy = sdma_prep_memcpy; sdma->dma_device.device_prep_dma_sg = sdma_prep_memcpy_sg; sdma->dma_device.device_control = sdma_control; sdma->dma_device.device_issue_pending = sdma_issue_pending; sdma->dma_device.dev->dma_parms = &sdma->dma_parms; dma_set_max_seg_size(sdma->dma_device.dev, 65535); ret = dma_async_device_register(&sdma->dma_device); if (ret) { dev_err(&pdev->dev, "unable to register\n"); goto err_init; } if (np) { ret = of_dma_controller_register(np, sdma_xlate, sdma); if (ret) { dev_err(&pdev->dev, "failed to register controller\n"); goto err_register; } spba_bus = of_find_compatible_node(NULL, NULL, "fsl,spba-bus"); ret = of_address_to_resource(spba_bus, 0, &spba_res); if (!ret) { sdma->spba_start_addr = spba_res.start; sdma->spba_end_addr = spba_res.end; } of_node_put(spba_bus); } platform_set_drvdata(pdev, sdma); dev_info(sdma->dev, "initialized\n"); return 0; err_register: dma_async_device_unregister(&sdma->dma_device); err_init: kfree(sdma->script_addrs); err_alloc: free_irq(irq, sdma); err_request_irq: iounmap(sdma->regs); err_ioremap: err_clk: release_mem_region(iores->start, resource_size(iores)); err_request_region: err_irq: kfree(sdma); return ret; } static int sdma_remove(struct platform_device *pdev) { return -EBUSY; } #ifdef CONFIG_PM_SLEEP static int sdma_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct sdma_engine *sdma = platform_get_drvdata(pdev); int i; sdma->suspend_off = false; /* Do nothing if not i.MX6SX or i.MX7D*/ if (sdma->drvdata != &sdma_imx6sx && sdma->drvdata != &sdma_imx7d) return 0; clk_enable(sdma->clk_ipg); clk_enable(sdma->clk_ahb); /* save regs */ for (i = 0; i < MXC_SDMA_SAVED_REG_NUM; i++) { /* * 0x78(SDMA_XTRIG_CONF2+4)~0x100(SDMA_CHNPRI_O) registers are * reserved and can't be touched. Skip these regs. */ if (i > SDMA_XTRIG_CONF2 / 4) sdma->save_regs[i] = readl_relaxed(sdma->regs + MXC_SDMA_RESERVED_REG + 4 * i); else sdma->save_regs[i] = readl_relaxed(sdma->regs + 4 * i); } clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); return 0; } static int sdma_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct sdma_engine *sdma = platform_get_drvdata(pdev); int i, ret; /* Do nothing if not i.MX6SX or i.MX7D*/ if (sdma->drvdata != &sdma_imx6sx && sdma->drvdata != &sdma_imx7d) return 0; clk_enable(sdma->clk_ipg); clk_enable(sdma->clk_ahb); /* Do nothing if mega/fast mix not turned off */ if (readl_relaxed(sdma->regs + SDMA_H_C0PTR)) { clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); return 0; } sdma->suspend_off = true; /* restore regs and load firmware */ for (i = 0; i < MXC_SDMA_SAVED_REG_NUM; i++) { /* * 0x78(SDMA_XTRIG_CONF2+4)~0x100(SDMA_CHNPRI_O) registers are * reserved and can't be touched. Skip these regs. */ if (i > SDMA_XTRIG_CONF2 / 4) writel_relaxed(sdma->save_regs[i], sdma->regs + MXC_SDMA_RESERVED_REG + 4 * i); else writel_relaxed(sdma->save_regs[i] , sdma->regs + 4 * i); } /* prepare priority for channel0 to start */ sdma_set_channel_priority(&sdma->channel[0], MXC_SDMA_DEFAULT_PRIORITY); clk_disable(sdma->clk_ipg); clk_disable(sdma->clk_ahb); ret = sdma_get_firmware(sdma, sdma->fw_name); if (ret) { dev_warn(&pdev->dev, "failed to get firware\n"); return ret; } return 0; } #endif static const struct dev_pm_ops sdma_pm_ops = { SET_LATE_SYSTEM_SLEEP_PM_OPS(sdma_suspend, sdma_resume) }; static struct platform_driver sdma_driver = { .driver = { .name = "imx-sdma", .of_match_table = sdma_dt_ids, .pm = &sdma_pm_ops, }, .id_table = sdma_devtypes, .remove = sdma_remove, }; static int __init sdma_module_init(void) { return platform_driver_probe(&sdma_driver, sdma_probe); } module_init(sdma_module_init); MODULE_AUTHOR("Sascha Hauer, Pengutronix "); MODULE_DESCRIPTION("i.MX SDMA driver"); MODULE_LICENSE("GPL");