--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Lightning Mountain centralized DMA controller driver
+ *
+ * Copyright (c) 2016 - 2020 Intel Corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "../dmaengine.h"
+#include "../virt-dma.h"
+
+#define DRIVER_NAME "lgm-dma"
+
+#define DMA_ID 0x0008
+#define DMA_ID_REV GENMASK(7, 0)
+#define DMA_ID_PNR GENMASK(19, 16)
+#define DMA_ID_CHNR GENMASK(26, 20)
+#define DMA_ID_DW_128B BIT(27)
+#define DMA_ID_AW_36B BIT(28)
+#define DMA_VER32 0x32
+#define DMA_VER31 0x31
+#define DMA_VER22 0x0A
+
+#define DMA_CTRL 0x0010
+#define DMA_CTRL_RST BIT(0)
+#define DMA_CTRL_DSRAM_PATH BIT(1)
+#define DMA_CTRL_DBURST_WR BIT(3)
+#define DMA_CTRL_VLD_DF_ACK BIT(4)
+#define DMA_CTRL_CH_FL BIT(6)
+#define DMA_CTRL_DS_FOD BIT(7)
+#define DMA_CTRL_DRB BIT(8)
+#define DMA_CTRL_ENBE BIT(9)
+#define DMA_CTRL_DESC_TMOUT_CNT_V31 GENMASK(27, 16)
+#define DMA_CTRL_DESC_TMOUT_EN_V31 BIT(30)
+#define DMA_CTRL_PKTARB BIT(31)
+
+#define DMA_CPOLL 0x0014
+#define DMA_CPOLL_CNT GENMASK(15, 4)
+#define DMA_CPOLL_EN BIT(31)
+
+#define DMA_CS 0x0018
+#define DMA_CS_MASK GENMASK(5, 0)
+
+#define DMA_CCTRL 0x001C
+#define DMA_CCTRL_ON BIT(0)
+#define DMA_CCTRL_RST BIT(1)
+#define DMA_CCTRL_CH_POLL_EN BIT(2)
+#define DMA_CCTRL_CH_ABC BIT(3) /* Adaptive Burst Chop */
+#define DMA_CDBA_MSB GENMASK(7, 4)
+#define DMA_CCTRL_DIR_TX BIT(8)
+#define DMA_CCTRL_CLASS GENMASK(11, 9)
+#define DMA_CCTRL_CLASSH GENMASK(19, 18)
+#define DMA_CCTRL_WR_NP_EN BIT(21)
+#define DMA_CCTRL_PDEN BIT(23)
+#define DMA_MAX_CLASS (SZ_32 - 1)
+
+#define DMA_CDBA 0x0020
+#define DMA_CDLEN 0x0024
+#define DMA_CIS 0x0028
+#define DMA_CIE 0x002C
+#define DMA_CI_EOP BIT(1)
+#define DMA_CI_DUR BIT(2)
+#define DMA_CI_DESCPT BIT(3)
+#define DMA_CI_CHOFF BIT(4)
+#define DMA_CI_RDERR BIT(5)
+#define DMA_CI_ALL \
+ (DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF | DMA_CI_RDERR)
+
+#define DMA_PS 0x0040
+#define DMA_PCTRL 0x0044
+#define DMA_PCTRL_RXBL16 BIT(0)
+#define DMA_PCTRL_TXBL16 BIT(1)
+#define DMA_PCTRL_RXBL GENMASK(3, 2)
+#define DMA_PCTRL_RXBL_8 3
+#define DMA_PCTRL_TXBL GENMASK(5, 4)
+#define DMA_PCTRL_TXBL_8 3
+#define DMA_PCTRL_PDEN BIT(6)
+#define DMA_PCTRL_RXBL32 BIT(7)
+#define DMA_PCTRL_RXENDI GENMASK(9, 8)
+#define DMA_PCTRL_TXENDI GENMASK(11, 10)
+#define DMA_PCTRL_TXBL32 BIT(15)
+#define DMA_PCTRL_MEM_FLUSH BIT(16)
+
+#define DMA_IRNEN1 0x00E8
+#define DMA_IRNCR1 0x00EC
+#define DMA_IRNEN 0x00F4
+#define DMA_IRNCR 0x00F8
+#define DMA_C_DP_TICK 0x100
+#define DMA_C_DP_TICK_TIKNARB GENMASK(15, 0)
+#define DMA_C_DP_TICK_TIKARB GENMASK(31, 16)
+
+#define DMA_C_HDRM 0x110
+/*
+ * If header mode is set in DMA descriptor,
+ * If bit 30 is disabled, HDR_LEN must be configured according to channel
+ * requirement.
+ * If bit 30 is enabled(checksum with heade mode), HDR_LEN has no need to
+ * be configured. It will enable check sum for switch
+ * If header mode is not set in DMA descriptor,
+ * This register setting doesn't matter
+ */
+#define DMA_C_HDRM_HDR_SUM BIT(30)
+
+#define DMA_C_BOFF 0x120
+#define DMA_C_BOFF_BOF_LEN GENMASK(7, 0)
+#define DMA_C_BOFF_EN BIT(31)
+
+#define DMA_ORRC 0x190
+#define DMA_ORRC_ORRCNT GENMASK(8, 4)
+#define DMA_ORRC_EN BIT(31)
+
+#define DMA_C_ENDIAN 0x200
+#define DMA_C_END_DATAENDI GENMASK(1, 0)
+#define DMA_C_END_DE_EN BIT(7)
+#define DMA_C_END_DESENDI GENMASK(9, 8)
+#define DMA_C_END_DES_EN BIT(16)
+
+/* DMA controller capability */
+#define DMA_ADDR_36BIT BIT(0)
+#define DMA_DATA_128BIT BIT(1)
+#define DMA_CHAN_FLOW_CTL BIT(2)
+#define DMA_DESC_FOD BIT(3)
+#define DMA_DESC_IN_SRAM BIT(4)
+#define DMA_EN_BYTE_EN BIT(5)
+#define DMA_DBURST_WR BIT(6)
+#define DMA_VALID_DESC_FETCH_ACK BIT(7)
+#define DMA_DFT_DRB BIT(8)
+
+#define DMA_ORRC_MAX_CNT (SZ_32 - 1)
+#define DMA_DFT_POLL_CNT SZ_4
+#define DMA_DFT_BURST_V22 SZ_2
+#define DMA_BURSTL_8DW SZ_8
+#define DMA_BURSTL_16DW SZ_16
+#define DMA_BURSTL_32DW SZ_32
+#define DMA_DFT_BURST DMA_BURSTL_16DW
+#define DMA_MAX_DESC_NUM (SZ_8K - 1)
+#define DMA_CHAN_BOFF_MAX (SZ_256 - 1)
+#define DMA_DFT_ENDIAN 0
+
+#define DMA_DFT_DESC_TCNT 50
+#define DMA_HDR_LEN_MAX (SZ_16K - 1)
+
+/* DMA flags */
+#define DMA_TX_CH BIT(0)
+#define DMA_RX_CH BIT(1)
+#define DEVICE_ALLOC_DESC BIT(2)
+#define CHAN_IN_USE BIT(3)
+#define DMA_HW_DESC BIT(4)
+
+/* Descriptor fields */
+#define DESC_DATA_LEN GENMASK(15, 0)
+#define DESC_BYTE_OFF GENMASK(25, 23)
+#define DESC_EOP BIT(28)
+#define DESC_SOP BIT(29)
+#define DESC_C BIT(30)
+#define DESC_OWN BIT(31)
+
+#define DMA_CHAN_RST 1
+#define DMA_MAX_SIZE (BIT(16) - 1)
+#define MAX_LOWER_CHANS 32
+#define MASK_LOWER_CHANS GENMASK(4, 0)
+#define DMA_OWN 1
+#define HIGH_4_BITS GENMASK(3, 0)
+#define DMA_DFT_DESC_NUM 1
+#define DMA_PKT_DROP_DIS 0
+
+enum ldma_chan_on_off {
+ DMA_CH_OFF = 0,
+ DMA_CH_ON = 1,
+};
+
+enum {
+ DMA_TYPE_TX = 0,
+ DMA_TYPE_RX,
+ DMA_TYPE_MCPY,
+};
+
+struct ldma_dev;
+struct ldma_port;
+
+struct ldma_chan {
+ struct virt_dma_chan vchan;
+ struct ldma_port *port; /* back pointer */
+ char name[8]; /* Channel name */
+ int nr; /* Channel id in hardware */
+ u32 flags; /* central way or channel based way */
+ enum ldma_chan_on_off onoff;
+ dma_addr_t desc_phys;
+ void *desc_base; /* Virtual address */
+ u32 desc_cnt; /* Number of descriptors */
+ int rst;
+ u32 hdrm_len;
+ bool hdrm_csum;
+ u32 boff_len;
+ u32 data_endian;
+ u32 desc_endian;
+ bool pden;
+ bool desc_rx_np;
+ bool data_endian_en;
+ bool desc_endian_en;
+ bool abc_en;
+ bool desc_init;
+ struct dma_pool *desc_pool; /* Descriptors pool */
+ u32 desc_num;
+ struct dw2_desc_sw *ds;
+ struct work_struct work;
+ struct dma_slave_config config;
+};
+
+struct ldma_port {
+ struct ldma_dev *ldev; /* back pointer */
+ u32 portid;
+ u32 rxbl;
+ u32 txbl;
+ u32 rxendi;
+ u32 txendi;
+ u32 pkt_drop;
+};
+
+/* Instance specific data */
+struct ldma_inst_data {
+ bool desc_in_sram;
+ bool chan_fc;
+ bool desc_fod; /* Fetch On Demand */
+ bool valid_desc_fetch_ack;
+ u32 orrc; /* Outstanding read count */
+ const char *name;
+ u32 type;
+};
+
+struct ldma_dev {
+ struct device *dev;
+ void __iomem *base;
+ struct reset_control *rst;
+ struct clk *core_clk;
+ struct dma_device dma_dev;
+ u32 ver;
+ int irq;
+ struct ldma_port *ports;
+ struct ldma_chan *chans; /* channel list on this DMA or port */
+ spinlock_t dev_lock; /* Controller register exclusive */
+ u32 chan_nrs;
+ u32 port_nrs;
+ u32 channels_mask;
+ u32 flags;
+ u32 pollcnt;
+ const struct ldma_inst_data *inst;
+ struct workqueue_struct *wq;
+};
+
+struct dw2_desc {
+ u32 field;
+ u32 addr;
+} __packed __aligned(8);
+
+struct dw2_desc_sw {
+ struct virt_dma_desc vdesc;
+ struct ldma_chan *chan;
+ dma_addr_t desc_phys;
+ size_t desc_cnt;
+ size_t size;
+ struct dw2_desc *desc_hw;
+};
+
+static inline void
+ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs)
+{
+ u32 old_val, new_val;
+
+ old_val = readl(d->base + ofs);
+ new_val = (old_val & ~mask) | (val & mask);
+
+ if (new_val != old_val)
+ writel(new_val, d->base + ofs);
+}
+
+static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan)
+{
+ return container_of(chan, struct ldma_chan, vchan.chan);
+}
+
+static inline struct ldma_dev *to_ldma_dev(struct dma_device *dma_dev)
+{
+ return container_of(dma_dev, struct ldma_dev, dma_dev);
+}
+
+static inline struct dw2_desc_sw *to_lgm_dma_desc(struct virt_dma_desc *vdesc)
+{
+ return container_of(vdesc, struct dw2_desc_sw, vdesc);
+}
+
+static inline bool ldma_chan_tx(struct ldma_chan *c)
+{
+ return !!(c->flags & DMA_TX_CH);
+}
+
+static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c)
+{
+ return !!(c->flags & DMA_HW_DESC);
+}
+
+static void ldma_dev_reset(struct ldma_dev *d)
+
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask = DMA_CTRL_PKTARB;
+ u32 val = enable ? DMA_CTRL_PKTARB : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask = DMA_CTRL_DSRAM_PATH;
+ u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask, val;
+
+ if (d->inst->type != DMA_TYPE_TX)
+ return;
+
+ mask = DMA_CTRL_CH_FL;
+ val = enable ? DMA_CTRL_CH_FL : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_global_polling_enable(struct ldma_dev *d)
+{
+ unsigned long flags;
+ u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT;
+ u32 val = DMA_CPOLL_EN;
+
+ val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt);
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CPOLL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask, val;
+
+ if (d->inst->type == DMA_TYPE_MCPY)
+ return;
+
+ mask = DMA_CTRL_DS_FOD;
+ val = enable ? DMA_CTRL_DS_FOD : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask = DMA_CTRL_ENBE;
+ u32 val = enable ? DMA_CTRL_ENBE : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_orrc_cfg(struct ldma_dev *d)
+{
+ unsigned long flags;
+ u32 val = 0;
+ u32 mask;
+
+ if (d->inst->type == DMA_TYPE_RX)
+ return;
+
+ mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT;
+ if (d->inst->orrc > 0 && d->inst->orrc <= DMA_ORRC_MAX_CNT)
+ val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->inst->orrc);
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_ORRC);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int tcnt)
+{
+ u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31;
+ unsigned long flags;
+ u32 val;
+
+ if (enable)
+ val = DMA_CTRL_DESC_TMOUT_EN_V31 | FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt);
+ else
+ val = 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask, val;
+
+ if (d->inst->type != DMA_TYPE_RX && d->inst->type != DMA_TYPE_MCPY)
+ return;
+
+ mask = DMA_CTRL_DBURST_WR;
+ val = enable ? DMA_CTRL_DBURST_WR : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool enable)
+{
+ unsigned long flags;
+ u32 mask, val;
+
+ if (d->inst->type != DMA_TYPE_TX)
+ return;
+
+ mask = DMA_CTRL_VLD_DF_ACK;
+ val = enable ? DMA_CTRL_VLD_DF_ACK : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable)
+{
+ unsigned long flags;
+ u32 mask = DMA_CTRL_DRB;
+ u32 val = enable ? DMA_CTRL_DRB : 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, mask, val, DMA_CTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static int ldma_dev_cfg(struct ldma_dev *d)
+{
+ bool enable;
+
+ ldma_dev_pkt_arb_cfg(d, true);
+ ldma_dev_global_polling_enable(d);
+
+ enable = !!(d->flags & DMA_DFT_DRB);
+ ldma_dev_drb_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_EN_BYTE_EN);
+ ldma_dev_byte_enable_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_CHAN_FLOW_CTL);
+ ldma_dev_chan_flow_ctl_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_DESC_FOD);
+ ldma_dev_desc_fetch_on_demand_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_DESC_IN_SRAM);
+ ldma_dev_sram_desc_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_DBURST_WR);
+ ldma_dev_dburst_wr_cfg(d, enable);
+
+ enable = !!(d->flags & DMA_VALID_DESC_FETCH_ACK);
+ ldma_dev_vld_fetch_ack_cfg(d, enable);
+
+ if (d->ver > DMA_VER22) {
+ ldma_dev_orrc_cfg(d);
+ ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT);
+ }
+
+ dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n",
+ d->inst->name, readl(d->base + DMA_CTRL));
+
+ return 0;
+}
+
+static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 class_low, class_high;
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ reg = readl(d->base + DMA_CCTRL);
+ /* Read from hardware */
+ if (reg & DMA_CCTRL_DIR_TX)
+ c->flags |= DMA_TX_CH;
+ else
+ c->flags |= DMA_RX_CH;
+
+ /* Keep the class value unchanged */
+ class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
+ class_high = FIELD_GET(DMA_CCTRL_CLASSH, reg);
+ val &= ~DMA_CCTRL_CLASS;
+ val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
+ val &= ~DMA_CCTRL_CLASSH;
+ val |= FIELD_PREP(DMA_CCTRL_CLASSH, class_high);
+ writel(val, d->base + DMA_CCTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ return 0;
+}
+
+static void ldma_chan_irq_init(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+ u32 enofs, crofs;
+ u32 cn_bit;
+
+ if (c->nr < MAX_LOWER_CHANS) {
+ enofs = DMA_IRNEN;
+ crofs = DMA_IRNCR;
+ } else {
+ enofs = DMA_IRNEN1;
+ crofs = DMA_IRNCR1;
+ }
+
+ cn_bit = BIT(c->nr & MASK_LOWER_CHANS);
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+
+ /* Clear all interrupts and disabled it */
+ writel(0, d->base + DMA_CIE);
+ writel(DMA_CI_ALL, d->base + DMA_CIS);
+
+ ldma_update_bits(d, cn_bit, 0, enofs);
+ writel(cn_bit, d->base + crofs);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_chan_set_class(struct ldma_chan *c, u32 val)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 class_val;
+
+ if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS)
+ return;
+
+ /* 3 bits low */
+ class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
+ /* 2 bits high */
+ class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3);
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH, class_val,
+ DMA_CCTRL);
+}
+
+static int ldma_chan_on(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+
+ /* If descriptors not configured, not allow to turn on channel */
+ if (WARN_ON(!c->desc_init))
+ return -EINVAL;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ c->onoff = DMA_CH_ON;
+
+ return 0;
+}
+
+static int ldma_chan_off(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+ u32 val;
+ int ret;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
+ !(val & DMA_CCTRL_ON), 0, 10000);
+ if (ret)
+ return ret;
+
+ c->onoff = DMA_CH_OFF;
+
+ return 0;
+}
+
+static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t desc_base,
+ int desc_num)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ writel(lower_32_bits(desc_base), d->base + DMA_CDBA);
+
+ /* Higher 4 bits of 36 bit addressing */
+ if (IS_ENABLED(CONFIG_64BIT)) {
+ u32 hi = upper_32_bits(desc_base) & HIGH_4_BITS;
+
+ ldma_update_bits(d, DMA_CDBA_MSB,
+ FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL);
+ }
+ writel(desc_num, d->base + DMA_CDLEN);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ c->desc_init = true;
+}
+
+static struct dma_async_tx_descriptor *
+ldma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, int desc_num)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ struct dma_async_tx_descriptor *tx;
+ struct dw2_desc_sw *ds;
+
+ if (!desc_num) {
+ dev_err(d->dev, "Channel %d must allocate descriptor first\n",
+ c->nr);
+ return NULL;
+ }
+
+ if (desc_num > DMA_MAX_DESC_NUM) {
+ dev_err(d->dev, "Channel %d descriptor number out of range %d\n",
+ c->nr, desc_num);
+ return NULL;
+ }
+
+ ldma_chan_desc_hw_cfg(c, desc_base, desc_num);
+
+ c->flags |= DMA_HW_DESC;
+ c->desc_cnt = desc_num;
+ c->desc_phys = desc_base;
+
+ ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
+ if (!ds)
+ return NULL;
+
+ tx = &ds->vdesc.tx;
+ dma_async_tx_descriptor_init(tx, chan);
+
+ return tx;
+}
+
+static int ldma_chan_reset(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+ u32 val;
+ int ret;
+
+ ret = ldma_chan_off(c);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
+ !(val & DMA_CCTRL_RST), 0, 10000);
+ if (ret)
+ return ret;
+
+ c->rst = 1;
+ c->desc_init = false;
+
+ return 0;
+}
+
+static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32 boff_len)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN;
+ u32 val;
+
+ if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX)
+ val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) | DMA_C_BOFF_EN;
+ else
+ val = 0;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_C_BOFF);
+}
+
+static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool enable,
+ u32 endian_type)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI;
+ u32 val;
+
+ if (enable)
+ val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI, endian_type);
+ else
+ val = 0;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
+}
+
+static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool enable,
+ u32 endian_type)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI;
+ u32 val;
+
+ if (enable)
+ val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI, endian_type);
+ else
+ val = 0;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
+}
+
+static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len, bool csum)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask, val;
+
+ /* NB, csum disabled, hdr length must be provided */
+ if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX))
+ return;
+
+ mask = DMA_C_HDRM_HDR_SUM;
+ val = DMA_C_HDRM_HDR_SUM;
+
+ if (!csum && hdr_len)
+ val = hdr_len;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_C_HDRM);
+}
+
+static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask, val;
+
+ /* Only valid for RX channel */
+ if (ldma_chan_tx(c))
+ return;
+
+ mask = DMA_CCTRL_WR_NP_EN;
+ val = enable ? DMA_CCTRL_WR_NP_EN : 0;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_CCTRL);
+}
+
+static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 mask, val;
+
+ if (d->ver < DMA_VER32 || ldma_chan_tx(c))
+ return;
+
+ mask = DMA_CCTRL_CH_ABC;
+ val = enable ? DMA_CCTRL_CH_ABC : 0;
+
+ ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+ ldma_update_bits(d, mask, val, DMA_CCTRL);
+}
+
+static int ldma_port_cfg(struct ldma_port *p)
+{
+ unsigned long flags;
+ struct ldma_dev *d;
+ u32 reg;
+
+ d = p->ldev;
+ reg = FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi);
+ reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi);
+
+ if (d->ver == DMA_VER22) {
+ reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl);
+ reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl);
+ } else {
+ reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop);
+
+ if (p->txbl == DMA_BURSTL_32DW)
+ reg |= DMA_PCTRL_TXBL32;
+ else if (p->txbl == DMA_BURSTL_16DW)
+ reg |= DMA_PCTRL_TXBL16;
+ else
+ reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8);
+
+ if (p->rxbl == DMA_BURSTL_32DW)
+ reg |= DMA_PCTRL_RXBL32;
+ else if (p->rxbl == DMA_BURSTL_16DW)
+ reg |= DMA_PCTRL_RXBL16;
+ else
+ reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8);
+ }
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ writel(p->portid, d->base + DMA_PS);
+ writel(reg, d->base + DMA_PCTRL);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ reg = readl(d->base + DMA_PCTRL); /* read back */
+ dev_dbg(d->dev, "Port Control 0x%08x configuration done\n", reg);
+
+ return 0;
+}
+
+static int ldma_chan_cfg(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+ u32 reg;
+
+ reg = c->pden ? DMA_CCTRL_PDEN : 0;
+ reg |= c->onoff ? DMA_CCTRL_ON : 0;
+ reg |= c->rst ? DMA_CCTRL_RST : 0;
+
+ ldma_chan_cctrl_cfg(c, reg);
+ ldma_chan_irq_init(c);
+
+ if (d->ver <= DMA_VER22)
+ return 0;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ ldma_chan_set_class(c, c->nr);
+ ldma_chan_byte_offset_cfg(c, c->boff_len);
+ ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian);
+ ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian);
+ ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum);
+ ldma_chan_rxwr_np_cfg(c, c->desc_rx_np);
+ ldma_chan_abc_cfg(c, c->abc_en);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+
+ if (ldma_chan_is_hw_desc(c))
+ ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt);
+
+ return 0;
+}
+
+static void ldma_dev_init(struct ldma_dev *d)
+{
+ unsigned long ch_mask = (unsigned long)d->channels_mask;
+ struct ldma_port *p;
+ struct ldma_chan *c;
+ int i;
+ u32 j;
+
+ spin_lock_init(&d->dev_lock);
+ ldma_dev_reset(d);
+ ldma_dev_cfg(d);
+
+ /* DMA port initialization */
+ for (i = 0; i < d->port_nrs; i++) {
+ p = &d->ports[i];
+ ldma_port_cfg(p);
+ }
+
+ /* DMA channel initialization */
+ for_each_set_bit(j, &ch_mask, d->chan_nrs) {
+ c = &d->chans[j];
+ ldma_chan_cfg(c);
+ }
+}
+
+static int ldma_cfg_init(struct ldma_dev *d)
+{
+ struct fwnode_handle *fwnode = dev_fwnode(d->dev);
+ struct ldma_port *p;
+ int i;
+
+ if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
+ d->flags |= DMA_EN_BYTE_EN;
+
+ if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
+ d->flags |= DMA_DBURST_WR;
+
+ if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
+ d->flags |= DMA_DFT_DRB;
+
+ if (fwnode_property_read_u32(fwnode, "intel,dma-poll-cnt",
+ &d->pollcnt))
+ d->pollcnt = DMA_DFT_POLL_CNT;
+
+ if (d->inst->chan_fc)
+ d->flags |= DMA_CHAN_FLOW_CTL;
+
+ if (d->inst->desc_fod)
+ d->flags |= DMA_DESC_FOD;
+
+ if (d->inst->desc_in_sram)
+ d->flags |= DMA_DESC_IN_SRAM;
+
+ if (d->inst->valid_desc_fetch_ack)
+ d->flags |= DMA_VALID_DESC_FETCH_ACK;
+
+ if (d->ver > DMA_VER22) {
+ if (!d->port_nrs)
+ return -EINVAL;
+
+ for (i = 0; i < d->port_nrs; i++) {
+ p = &d->ports[i];
+ p->rxendi = DMA_DFT_ENDIAN;
+ p->txendi = DMA_DFT_ENDIAN;
+ p->rxbl = DMA_DFT_BURST;
+ p->txbl = DMA_DFT_BURST;
+ p->pkt_drop = DMA_PKT_DROP_DIS;
+ }
+ }
+
+ return 0;
+}
+
+static void dma_free_desc_resource(struct virt_dma_desc *vdesc)
+{
+ struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc);
+ struct ldma_chan *c = ds->chan;
+
+ dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys);
+ kfree(ds);
+}
+
+static struct dw2_desc_sw *
+dma_alloc_desc_resource(int num, struct ldma_chan *c)
+{
+ struct device *dev = c->vchan.chan.device->dev;
+ struct dw2_desc_sw *ds;
+
+ if (num > c->desc_num) {
+ dev_err(dev, "sg num %d exceed max %d\n", num, c->desc_num);
+ return NULL;
+ }
+
+ ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
+ if (!ds)
+ return NULL;
+
+ ds->chan = c;
+ ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC,
+ &ds->desc_phys);
+ if (!ds->desc_hw) {
+ dev_dbg(dev, "out of memory for link descriptor\n");
+ kfree(ds);
+ return NULL;
+ }
+ ds->desc_cnt = num;
+
+ return ds;
+}
+
+static void ldma_chan_irq_en(struct ldma_chan *c)
+{
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&d->dev_lock, flags);
+ writel(c->nr, d->base + DMA_CS);
+ writel(DMA_CI_EOP, d->base + DMA_CIE);
+ writel(BIT(c->nr), d->base + DMA_IRNEN);
+ spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_issue_pending(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ unsigned long flags;
+
+ if (d->ver == DMA_VER22) {
+ spin_lock_irqsave(&c->vchan.lock, flags);
+ if (vchan_issue_pending(&c->vchan)) {
+ struct virt_dma_desc *vdesc;
+
+ /* Get the next descriptor */
+ vdesc = vchan_next_desc(&c->vchan);
+ if (!vdesc) {
+ c->ds = NULL;
+ spin_unlock_irqrestore(&c->vchan.lock, flags);
+ return;
+ }
+ list_del(&vdesc->node);
+ c->ds = to_lgm_dma_desc(vdesc);
+ ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds->desc_cnt);
+ ldma_chan_irq_en(c);
+ }
+ spin_unlock_irqrestore(&c->vchan.lock, flags);
+ }
+ ldma_chan_on(c);
+}
+
+static void ldma_synchronize(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+
+ /*
+ * clear any pending work if any. In that
+ * case the resource needs to be free here.
+ */
+ cancel_work_sync(&c->work);
+ vchan_synchronize(&c->vchan);
+ if (c->ds)
+ dma_free_desc_resource(&c->ds->vdesc);
+}
+
+static int ldma_terminate_all(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&c->vchan.lock, flags);
+ vchan_get_all_descriptors(&c->vchan, &head);
+ spin_unlock_irqrestore(&c->vchan.lock, flags);
+ vchan_dma_desc_free_list(&c->vchan, &head);
+
+ return ldma_chan_reset(c);
+}
+
+static int ldma_resume_chan(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+
+ ldma_chan_on(c);
+
+ return 0;
+}
+
+static int ldma_pause_chan(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+
+ return ldma_chan_off(c);
+}
+
+static enum dma_status
+ldma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ enum dma_status status = DMA_COMPLETE;
+
+ if (d->ver == DMA_VER22)
+ status = dma_cookie_status(chan, cookie, txstate);
+
+ return status;
+}
+
+static void dma_chan_irq(int irq, void *data)
+{
+ struct ldma_chan *c = data;
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ u32 stat;
+
+ /* Disable channel interrupts */
+ writel(c->nr, d->base + DMA_CS);
+ stat = readl(d->base + DMA_CIS);
+ if (!stat)
+ return;
+
+ writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base + DMA_CIE);
+ writel(stat, d->base + DMA_CIS);
+ queue_work(d->wq, &c->work);
+}
+
+static irqreturn_t dma_interrupt(int irq, void *dev_id)
+{
+ struct ldma_dev *d = dev_id;
+ struct ldma_chan *c;
+ unsigned long irncr;
+ u32 cid;
+
+ irncr = readl(d->base + DMA_IRNCR);
+ if (!irncr) {
+ dev_err(d->dev, "dummy interrupt\n");
+ return IRQ_NONE;
+ }
+
+ for_each_set_bit(cid, &irncr, d->chan_nrs) {
+ /* Mask */
+ writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base + DMA_IRNEN);
+ /* Ack */
+ writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base + DMA_IRNCR);
+
+ c = &d->chans[cid];
+ dma_chan_irq(irq, c);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void prep_slave_burst_len(struct ldma_chan *c)
+{
+ struct ldma_port *p = c->port;
+ struct dma_slave_config *cfg = &c->config;
+
+ if (cfg->dst_maxburst)
+ cfg->src_maxburst = cfg->dst_maxburst;
+
+ /* TX and RX has the same burst length */
+ p->txbl = ilog2(cfg->src_maxburst);
+ p->rxbl = p->txbl;
+}
+
+static struct dma_async_tx_descriptor *
+ldma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sglen, enum dma_transfer_direction dir,
+ unsigned long flags, void *context)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ size_t len, avail, total = 0;
+ struct dw2_desc *hw_ds;
+ struct dw2_desc_sw *ds;
+ struct scatterlist *sg;
+ int num = sglen, i;
+ dma_addr_t addr;
+
+ if (!sgl)
+ return NULL;
+
+ if (d->ver > DMA_VER22)
+ return ldma_chan_desc_cfg(chan, sgl->dma_address, sglen);
+
+ for_each_sg(sgl, sg, sglen, i) {
+ avail = sg_dma_len(sg);
+ if (avail > DMA_MAX_SIZE)
+ num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
+ }
+
+ ds = dma_alloc_desc_resource(num, c);
+ if (!ds)
+ return NULL;
+
+ c->ds = ds;
+
+ num = 0;
+ /* sop and eop has to be handled nicely */
+ for_each_sg(sgl, sg, sglen, i) {
+ addr = sg_dma_address(sg);
+ avail = sg_dma_len(sg);
+ total += avail;
+
+ do {
+ len = min_t(size_t, avail, DMA_MAX_SIZE);
+
+ hw_ds = &ds->desc_hw[num];
+ switch (sglen) {
+ case 1:
+ hw_ds->field &= ~DESC_SOP;
+ hw_ds->field |= FIELD_PREP(DESC_SOP, 1);
+
+ hw_ds->field &= ~DESC_EOP;
+ hw_ds->field |= FIELD_PREP(DESC_EOP, 1);
+ break;
+ default:
+ if (num == 0) {
+ hw_ds->field &= ~DESC_SOP;
+ hw_ds->field |= FIELD_PREP(DESC_SOP, 1);
+
+ hw_ds->field &= ~DESC_EOP;
+ hw_ds->field |= FIELD_PREP(DESC_EOP, 0);
+ } else if (num == (sglen - 1)) {
+ hw_ds->field &= ~DESC_SOP;
+ hw_ds->field |= FIELD_PREP(DESC_SOP, 0);
+ hw_ds->field &= ~DESC_EOP;
+ hw_ds->field |= FIELD_PREP(DESC_EOP, 1);
+ } else {
+ hw_ds->field &= ~DESC_SOP;
+ hw_ds->field |= FIELD_PREP(DESC_SOP, 0);
+
+ hw_ds->field &= ~DESC_EOP;
+ hw_ds->field |= FIELD_PREP(DESC_EOP, 0);
+ }
+ break;
+ }
+ /* Only 32 bit address supported */
+ hw_ds->addr = (u32)addr;
+
+ hw_ds->field &= ~DESC_DATA_LEN;
+ hw_ds->field |= FIELD_PREP(DESC_DATA_LEN, len);
+
+ hw_ds->field &= ~DESC_C;
+ hw_ds->field |= FIELD_PREP(DESC_C, 0);
+
+ hw_ds->field &= ~DESC_BYTE_OFF;
+ hw_ds->field |= FIELD_PREP(DESC_BYTE_OFF, addr & 0x3);
+
+ /* Ensure data ready before ownership change */
+ wmb();
+ hw_ds->field &= ~DESC_OWN;
+ hw_ds->field |= FIELD_PREP(DESC_OWN, DMA_OWN);
+
+ /* Ensure ownership changed before moving forward */
+ wmb();
+ num++;
+ addr += len;
+ avail -= len;
+ } while (avail);
+ }
+
+ ds->size = total;
+ prep_slave_burst_len(c);
+
+ return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK);
+}
+
+static int
+ldma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+
+ memcpy(&c->config, cfg, sizeof(c->config));
+
+ return 0;
+}
+
+static int ldma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+ struct device *dev = c->vchan.chan.device->dev;
+ size_t desc_sz;
+
+ if (d->ver > DMA_VER22) {
+ c->flags |= CHAN_IN_USE;
+ return 0;
+ }
+
+ if (c->desc_pool)
+ return c->desc_num;
+
+ desc_sz = c->desc_num * sizeof(struct dw2_desc);
+ c->desc_pool = dma_pool_create(c->name, dev, desc_sz,
+ __alignof__(struct dw2_desc), 0);
+
+ if (!c->desc_pool) {
+ dev_err(dev, "unable to allocate descriptor pool\n");
+ return -ENOMEM;
+ }
+
+ return c->desc_num;
+}
+
+static void ldma_free_chan_resources(struct dma_chan *chan)
+{
+ struct ldma_chan *c = to_ldma_chan(chan);
+ struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+
+ if (d->ver == DMA_VER22) {
+ dma_pool_destroy(c->desc_pool);
+ c->desc_pool = NULL;
+ vchan_free_chan_resources(to_virt_chan(chan));
+ ldma_chan_reset(c);
+ } else {
+ c->flags &= ~CHAN_IN_USE;
+ }
+}
+
+static void dma_work(struct work_struct *work)
+{
+ struct ldma_chan *c = container_of(work, struct ldma_chan, work);
+ struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx;
+ struct virt_dma_chan *vc = &c->vchan;
+ struct dmaengine_desc_callback cb;
+ struct virt_dma_desc *vd, *_vd;
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&c->vchan.lock, flags);
+ list_splice_tail_init(&vc->desc_completed, &head);
+ spin_unlock_irqrestore(&c->vchan.lock, flags);
+ dmaengine_desc_get_callback(tx, &cb);
+ dma_cookie_complete(tx);
+ dmaengine_desc_callback_invoke(&cb, NULL);
+
+ list_for_each_entry_safe(vd, _vd, &head, node) {
+ dmaengine_desc_get_callback(tx, &cb);
+ dma_cookie_complete(tx);
+ list_del(&vd->node);
+ dmaengine_desc_callback_invoke(&cb, NULL);
+
+ vchan_vdesc_fini(vd);
+ }
+ c->ds = NULL;
+}
+
+static void
+update_burst_len_v22(struct ldma_chan *c, struct ldma_port *p, u32 burst)
+{
+ if (ldma_chan_tx(c))
+ p->txbl = ilog2(burst);
+ else
+ p->rxbl = ilog2(burst);
+}
+
+static void
+update_burst_len_v3X(struct ldma_chan *c, struct ldma_port *p, u32 burst)
+{
+ if (ldma_chan_tx(c))
+ p->txbl = burst;
+ else
+ p->rxbl = burst;
+}
+
+static int
+update_client_configs(struct of_dma *ofdma, struct of_phandle_args *spec)
+{
+ struct ldma_dev *d = ofdma->of_dma_data;
+ u32 chan_id = spec->args[0];
+ u32 port_id = spec->args[1];
+ u32 burst = spec->args[2];
+ struct ldma_port *p;
+ struct ldma_chan *c;
+
+ if (chan_id >= d->chan_nrs || port_id >= d->port_nrs)
+ return 0;
+
+ p = &d->ports[port_id];
+ c = &d->chans[chan_id];
+ c->port = p;
+
+ if (d->ver == DMA_VER22)
+ update_burst_len_v22(c, p, burst);
+ else
+ update_burst_len_v3X(c, p, burst);
+
+ ldma_port_cfg(p);
+
+ return 1;
+}
+
+static struct dma_chan *ldma_xlate(struct of_phandle_args *spec,
+ struct of_dma *ofdma)
+{
+ struct ldma_dev *d = ofdma->of_dma_data;
+ u32 chan_id = spec->args[0];
+ int ret;
+
+ if (!spec->args_count)
+ return NULL;
+
+ /* if args_count is 1 driver use default settings */
+ if (spec->args_count > 1) {
+ ret = update_client_configs(ofdma, spec);
+ if (!ret)
+ return NULL;
+ }
+
+ return dma_get_slave_channel(&d->chans[chan_id].vchan.chan);
+}
+
+static void ldma_dma_init_v22(int i, struct ldma_dev *d)
+{
+ struct ldma_chan *c;
+
+ c = &d->chans[i];
+ c->nr = i; /* Real channel number */
+ c->rst = DMA_CHAN_RST;
+ c->desc_num = DMA_DFT_DESC_NUM;
+ snprintf(c->name, sizeof(c->name), "chan%d", c->nr);
+ INIT_WORK(&c->work, dma_work);
+ c->vchan.desc_free = dma_free_desc_resource;
+ vchan_init(&c->vchan, &d->dma_dev);
+}
+
+static void ldma_dma_init_v3X(int i, struct ldma_dev *d)
+{
+ struct ldma_chan *c;
+
+ c = &d->chans[i];
+ c->data_endian = DMA_DFT_ENDIAN;
+ c->desc_endian = DMA_DFT_ENDIAN;
+ c->data_endian_en = false;
+ c->desc_endian_en = false;
+ c->desc_rx_np = false;
+ c->flags |= DEVICE_ALLOC_DESC;
+ c->onoff = DMA_CH_OFF;
+ c->rst = DMA_CHAN_RST;
+ c->abc_en = true;
+ c->hdrm_csum = false;
+ c->boff_len = 0;
+ c->nr = i;
+ c->vchan.desc_free = dma_free_desc_resource;
+ vchan_init(&c->vchan, &d->dma_dev);
+}
+
+static int ldma_init_v22(struct ldma_dev *d, struct platform_device *pdev)
+{
+ int ret;
+
+ ret = device_property_read_u32(d->dev, "dma-channels", &d->chan_nrs);
+ if (ret < 0) {
+ dev_err(d->dev, "unable to read dma-channels property\n");
+ return ret;
+ }
+
+ d->irq = platform_get_irq(pdev, 0);
+ if (d->irq < 0)
+ return d->irq;
+
+ ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, 0,
+ DRIVER_NAME, d);
+ if (ret)
+ return ret;
+
+ d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM |
+ WQ_HIGHPRI);
+ if (!d->wq)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void ldma_clk_disable(void *data)
+{
+ struct ldma_dev *d = data;
+
+ clk_disable_unprepare(d->core_clk);
+ reset_control_assert(d->rst);
+}
+
+static const struct ldma_inst_data dma0 = {
+ .name = "dma0",
+ .chan_fc = false,
+ .desc_fod = false,
+ .desc_in_sram = false,
+ .valid_desc_fetch_ack = false,
+};
+
+static const struct ldma_inst_data dma2tx = {
+ .name = "dma2tx",
+ .type = DMA_TYPE_TX,
+ .orrc = 16,
+ .chan_fc = true,
+ .desc_fod = true,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = true,
+};
+
+static const struct ldma_inst_data dma1rx = {
+ .name = "dma1rx",
+ .type = DMA_TYPE_RX,
+ .orrc = 16,
+ .chan_fc = false,
+ .desc_fod = true,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = false,
+};
+
+static const struct ldma_inst_data dma1tx = {
+ .name = "dma1tx",
+ .type = DMA_TYPE_TX,
+ .orrc = 16,
+ .chan_fc = true,
+ .desc_fod = true,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = true,
+};
+
+static const struct ldma_inst_data dma0tx = {
+ .name = "dma0tx",
+ .type = DMA_TYPE_TX,
+ .orrc = 16,
+ .chan_fc = true,
+ .desc_fod = true,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = true,
+};
+
+static const struct ldma_inst_data dma3 = {
+ .name = "dma3",
+ .type = DMA_TYPE_MCPY,
+ .orrc = 16,
+ .chan_fc = false,
+ .desc_fod = false,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = false,
+};
+
+static const struct ldma_inst_data toe_dma30 = {
+ .name = "toe_dma30",
+ .type = DMA_TYPE_MCPY,
+ .orrc = 16,
+ .chan_fc = false,
+ .desc_fod = false,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = true,
+};
+
+static const struct ldma_inst_data toe_dma31 = {
+ .name = "toe_dma31",
+ .type = DMA_TYPE_MCPY,
+ .orrc = 16,
+ .chan_fc = false,
+ .desc_fod = false,
+ .desc_in_sram = true,
+ .valid_desc_fetch_ack = true,
+};
+
+static const struct of_device_id intel_ldma_match[] = {
+ { .compatible = "intel,lgm-cdma", .data = &dma0},
+ { .compatible = "intel,lgm-dma2tx", .data = &dma2tx},
+ { .compatible = "intel,lgm-dma1rx", .data = &dma1rx},
+ { .compatible = "intel,lgm-dma1tx", .data = &dma1tx},
+ { .compatible = "intel,lgm-dma0tx", .data = &dma0tx},
+ { .compatible = "intel,lgm-dma3", .data = &dma3},
+ { .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30},
+ { .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31},
+ {}
+};
+
+static int intel_ldma_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dma_device *dma_dev;
+ unsigned long ch_mask;
+ struct ldma_chan *c;
+ struct ldma_port *p;
+ struct ldma_dev *d;
+ u32 id, bitn = 32, j;
+ int i, ret;
+
+ d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ /* Link controller to platform device */
+ d->dev = &pdev->dev;
+
+ d->inst = device_get_match_data(dev);
+ if (!d->inst) {
+ dev_err(dev, "No device match found\n");
+ return -ENODEV;
+ }
+
+ d->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(d->base))
+ return PTR_ERR(d->base);
+
+ /* Power up and reset the dma engine, some DMAs always on?? */
+ d->core_clk = devm_clk_get_optional(dev, NULL);
+ if (IS_ERR(d->core_clk))
+ return PTR_ERR(d->core_clk);
+ clk_prepare_enable(d->core_clk);
+
+ d->rst = devm_reset_control_get_optional(dev, NULL);
+ if (IS_ERR(d->rst))
+ return PTR_ERR(d->rst);
+ reset_control_deassert(d->rst);
+
+ ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
+ if (ret) {
+ dev_err(dev, "Failed to devm_add_action_or_reset, %d\n", ret);
+ return ret;
+ }
+
+ id = readl(d->base + DMA_ID);
+ d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id);
+ d->port_nrs = FIELD_GET(DMA_ID_PNR, id);
+ d->ver = FIELD_GET(DMA_ID_REV, id);
+
+ if (id & DMA_ID_AW_36B)
+ d->flags |= DMA_ADDR_36BIT;
+
+ if (IS_ENABLED(CONFIG_64BIT) && (id & DMA_ID_AW_36B))
+ bitn = 36;
+
+ if (id & DMA_ID_DW_128B)
+ d->flags |= DMA_DATA_128BIT;
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn));
+ if (ret) {
+ dev_err(dev, "No usable DMA configuration\n");
+ return ret;
+ }
+
+ if (d->ver == DMA_VER22) {
+ ret = ldma_init_v22(d, pdev);
+ if (ret)
+ return ret;
+ }
+
+ ret = device_property_read_u32(dev, "dma-channel-mask", &d->channels_mask);
+ if (ret < 0)
+ d->channels_mask = GENMASK(d->chan_nrs - 1, 0);
+
+ dma_dev = &d->dma_dev;
+
+ dma_cap_zero(dma_dev->cap_mask);
+ dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+
+ /* Channel initializations */
+ INIT_LIST_HEAD(&dma_dev->channels);
+
+ /* Port Initializations */
+ d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p), GFP_KERNEL);
+ if (!d->ports)
+ return -ENOMEM;
+
+ /* Channels Initializations */
+ d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c), GFP_KERNEL);
+ if (!d->chans)
+ return -ENOMEM;
+
+ for (i = 0; i < d->port_nrs; i++) {
+ p = &d->ports[i];
+ p->portid = i;
+ p->ldev = d;
+ }
+
+ ret = ldma_cfg_init(d);
+ if (ret)
+ return ret;
+
+ dma_dev->dev = &pdev->dev;
+
+ ch_mask = (unsigned long)d->channels_mask;
+ for_each_set_bit(j, &ch_mask, d->chan_nrs) {
+ if (d->ver == DMA_VER22)
+ ldma_dma_init_v22(j, d);
+ else
+ ldma_dma_init_v3X(j, d);
+ }
+
+ dma_dev->device_alloc_chan_resources = ldma_alloc_chan_resources;
+ dma_dev->device_free_chan_resources = ldma_free_chan_resources;
+ dma_dev->device_terminate_all = ldma_terminate_all;
+ dma_dev->device_issue_pending = ldma_issue_pending;
+ dma_dev->device_tx_status = ldma_tx_status;
+ dma_dev->device_resume = ldma_resume_chan;
+ dma_dev->device_pause = ldma_pause_chan;
+ dma_dev->device_prep_slave_sg = ldma_prep_slave_sg;
+
+ if (d->ver == DMA_VER22) {
+ dma_dev->device_config = ldma_slave_config;
+ dma_dev->device_synchronize = ldma_synchronize;
+ dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ dma_dev->directions = BIT(DMA_MEM_TO_DEV) |
+ BIT(DMA_DEV_TO_MEM);
+ dma_dev->residue_granularity =
+ DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
+ }
+
+ platform_set_drvdata(pdev, d);
+
+ ldma_dev_init(d);
+
+ ret = dma_async_device_register(dma_dev);
+ if (ret) {
+ dev_err(dev, "Failed to register slave DMA engine device\n");
+ return ret;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate, d);
+ if (ret) {
+ dev_err(dev, "Failed to register of DMA controller\n");
+ dma_async_device_unregister(dma_dev);
+ return ret;
+ }
+
+ dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d->ver,
+ d->port_nrs, d->chan_nrs);
+
+ return 0;
+}
+
+static struct platform_driver intel_ldma_driver = {
+ .probe = intel_ldma_probe,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = intel_ldma_match,
+ },
+};
+
+/*
+ * Perform this driver as device_initcall to make sure initialization happens
+ * before its DMA clients of some are platform specific and also to provide
+ * registered DMA channels and DMA capabilities to clients before their
+ * initialization.
+ */
+static int __init intel_ldma_init(void)
+{
+ return platform_driver_register(&intel_ldma_driver);
+}
+
+device_initcall(intel_ldma_init);
projects / platform / kernel / linux-starfive.git / commitdiff