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d702419134
Certain users can not use right now the DMAengine API due to missing
features in the core. Prime example is Networking.
These users can use the glue layer interface to avoid misuse of DMAengine
API and when the core gains the needed features they can be converted to
use generic API.
The most prominent features the glue layer clients are depending on:
- most PSI-L native peripheral use extra rflow ranges on a receive channel
and depending on the peripheral's configuration packets from a single
free descriptor ring is going to be received to different receive ring
- it is also possible to have different free descriptor rings per rflow
and an rflow can also support 4 additional free descriptor ring based
on the size of the incoming packet
- out of order completion of descriptors on a channel
- when we have several queues to handle different priority packets the
descriptors will be completed 'out-of-order'
- the notion of prep_slave_sg is not matching with what the streaming type
of operation is demanding for networking
- Streaming type of operation
- Ability to fill the free descriptor ring with descriptors in
anticipation of incoming traffic and when a packet arrives UDMAP will
form a packet and gives it to the client driver
- the descriptors are not backed with exact size data buffers as we don't
know the size of the packet we will receive, but as a generic pool of
buffers to be used by the receive channel
- NAPI type of operation (polling instead of interrupt driven transfer)
- without this we can not sustain gigabit speeds and we need to support NAPI
- not to limit this to networking, but other high performance operations
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Link: https://lore.kernel.org/r/20191223110458.30766-12-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
151 lines
4.9 KiB
C
151 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
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*/
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#ifndef K3_UDMA_H_
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#define K3_UDMA_H_
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#include <linux/soc/ti/ti_sci_protocol.h>
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/* Global registers */
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#define UDMA_REV_REG 0x0
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#define UDMA_PERF_CTL_REG 0x4
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#define UDMA_EMU_CTL_REG 0x8
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#define UDMA_PSIL_TO_REG 0x10
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#define UDMA_UTC_CTL_REG 0x1c
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#define UDMA_CAP_REG(i) (0x20 + ((i) * 4))
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#define UDMA_RX_FLOW_ID_FW_OES_REG 0x80
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#define UDMA_RX_FLOW_ID_FW_STATUS_REG 0x88
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/* TX chan RT regs */
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#define UDMA_TCHAN_RT_CTL_REG 0x0
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#define UDMA_TCHAN_RT_SWTRIG_REG 0x8
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#define UDMA_TCHAN_RT_STDATA_REG 0x80
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#define UDMA_TCHAN_RT_PEER_REG(i) (0x200 + ((i) * 0x4))
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#define UDMA_TCHAN_RT_PEER_STATIC_TR_XY_REG \
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UDMA_TCHAN_RT_PEER_REG(0) /* PSI-L: 0x400 */
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#define UDMA_TCHAN_RT_PEER_STATIC_TR_Z_REG \
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UDMA_TCHAN_RT_PEER_REG(1) /* PSI-L: 0x401 */
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#define UDMA_TCHAN_RT_PEER_BCNT_REG \
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UDMA_TCHAN_RT_PEER_REG(4) /* PSI-L: 0x404 */
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#define UDMA_TCHAN_RT_PEER_RT_EN_REG \
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UDMA_TCHAN_RT_PEER_REG(8) /* PSI-L: 0x408 */
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#define UDMA_TCHAN_RT_PCNT_REG 0x400
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#define UDMA_TCHAN_RT_BCNT_REG 0x408
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#define UDMA_TCHAN_RT_SBCNT_REG 0x410
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/* RX chan RT regs */
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#define UDMA_RCHAN_RT_CTL_REG 0x0
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#define UDMA_RCHAN_RT_SWTRIG_REG 0x8
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#define UDMA_RCHAN_RT_STDATA_REG 0x80
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#define UDMA_RCHAN_RT_PEER_REG(i) (0x200 + ((i) * 0x4))
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#define UDMA_RCHAN_RT_PEER_STATIC_TR_XY_REG \
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UDMA_RCHAN_RT_PEER_REG(0) /* PSI-L: 0x400 */
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#define UDMA_RCHAN_RT_PEER_STATIC_TR_Z_REG \
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UDMA_RCHAN_RT_PEER_REG(1) /* PSI-L: 0x401 */
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#define UDMA_RCHAN_RT_PEER_BCNT_REG \
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UDMA_RCHAN_RT_PEER_REG(4) /* PSI-L: 0x404 */
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#define UDMA_RCHAN_RT_PEER_RT_EN_REG \
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UDMA_RCHAN_RT_PEER_REG(8) /* PSI-L: 0x408 */
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#define UDMA_RCHAN_RT_PCNT_REG 0x400
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#define UDMA_RCHAN_RT_BCNT_REG 0x408
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#define UDMA_RCHAN_RT_SBCNT_REG 0x410
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/* UDMA_TCHAN_RT_CTL_REG/UDMA_RCHAN_RT_CTL_REG */
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#define UDMA_CHAN_RT_CTL_EN BIT(31)
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#define UDMA_CHAN_RT_CTL_TDOWN BIT(30)
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#define UDMA_CHAN_RT_CTL_PAUSE BIT(29)
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#define UDMA_CHAN_RT_CTL_FTDOWN BIT(28)
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#define UDMA_CHAN_RT_CTL_ERROR BIT(0)
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/* UDMA_TCHAN_RT_PEER_RT_EN_REG/UDMA_RCHAN_RT_PEER_RT_EN_REG (PSI-L: 0x408) */
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#define UDMA_PEER_RT_EN_ENABLE BIT(31)
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#define UDMA_PEER_RT_EN_TEARDOWN BIT(30)
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#define UDMA_PEER_RT_EN_PAUSE BIT(29)
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#define UDMA_PEER_RT_EN_FLUSH BIT(28)
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#define UDMA_PEER_RT_EN_IDLE BIT(1)
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/*
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* UDMA_TCHAN_RT_PEER_STATIC_TR_XY_REG /
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* UDMA_RCHAN_RT_PEER_STATIC_TR_XY_REG
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*/
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#define PDMA_STATIC_TR_X_MASK GENMASK(26, 24)
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#define PDMA_STATIC_TR_X_SHIFT (24)
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#define PDMA_STATIC_TR_Y_MASK GENMASK(11, 0)
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#define PDMA_STATIC_TR_Y_SHIFT (0)
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#define PDMA_STATIC_TR_Y(x) \
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(((x) << PDMA_STATIC_TR_Y_SHIFT) & PDMA_STATIC_TR_Y_MASK)
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#define PDMA_STATIC_TR_X(x) \
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(((x) << PDMA_STATIC_TR_X_SHIFT) & PDMA_STATIC_TR_X_MASK)
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#define PDMA_STATIC_TR_XY_ACC32 BIT(30)
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#define PDMA_STATIC_TR_XY_BURST BIT(31)
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/*
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* UDMA_TCHAN_RT_PEER_STATIC_TR_Z_REG /
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* UDMA_RCHAN_RT_PEER_STATIC_TR_Z_REG
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*/
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#define PDMA_STATIC_TR_Z(x, mask) ((x) & (mask))
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struct udma_dev;
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struct udma_tchan;
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struct udma_rchan;
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struct udma_rflow;
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enum udma_rm_range {
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RM_RANGE_TCHAN = 0,
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RM_RANGE_RCHAN,
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RM_RANGE_RFLOW,
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RM_RANGE_LAST,
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};
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struct udma_tisci_rm {
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const struct ti_sci_handle *tisci;
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const struct ti_sci_rm_udmap_ops *tisci_udmap_ops;
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u32 tisci_dev_id;
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/* tisci information for PSI-L thread pairing/unpairing */
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const struct ti_sci_rm_psil_ops *tisci_psil_ops;
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u32 tisci_navss_dev_id;
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struct ti_sci_resource *rm_ranges[RM_RANGE_LAST];
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};
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/* Direct access to UDMA low lever resources for the glue layer */
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int xudma_navss_psil_pair(struct udma_dev *ud, u32 src_thread, u32 dst_thread);
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int xudma_navss_psil_unpair(struct udma_dev *ud, u32 src_thread,
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u32 dst_thread);
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struct udma_dev *of_xudma_dev_get(struct device_node *np, const char *property);
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void xudma_dev_put(struct udma_dev *ud);
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u32 xudma_dev_get_psil_base(struct udma_dev *ud);
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struct udma_tisci_rm *xudma_dev_get_tisci_rm(struct udma_dev *ud);
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int xudma_alloc_gp_rflow_range(struct udma_dev *ud, int from, int cnt);
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int xudma_free_gp_rflow_range(struct udma_dev *ud, int from, int cnt);
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struct udma_tchan *xudma_tchan_get(struct udma_dev *ud, int id);
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struct udma_rchan *xudma_rchan_get(struct udma_dev *ud, int id);
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struct udma_rflow *xudma_rflow_get(struct udma_dev *ud, int id);
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void xudma_tchan_put(struct udma_dev *ud, struct udma_tchan *p);
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void xudma_rchan_put(struct udma_dev *ud, struct udma_rchan *p);
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void xudma_rflow_put(struct udma_dev *ud, struct udma_rflow *p);
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int xudma_tchan_get_id(struct udma_tchan *p);
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int xudma_rchan_get_id(struct udma_rchan *p);
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int xudma_rflow_get_id(struct udma_rflow *p);
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u32 xudma_tchanrt_read(struct udma_tchan *tchan, int reg);
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void xudma_tchanrt_write(struct udma_tchan *tchan, int reg, u32 val);
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u32 xudma_rchanrt_read(struct udma_rchan *rchan, int reg);
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void xudma_rchanrt_write(struct udma_rchan *rchan, int reg, u32 val);
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bool xudma_rflow_is_gp(struct udma_dev *ud, int id);
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#endif /* K3_UDMA_H_ */
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