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1646 lines
48 KiB
1646 lines
48 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2016 Broadcom |
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*/ |
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|
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/* |
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* Broadcom PDC Mailbox Driver |
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* The PDC provides a ring based programming interface to one or more hardware |
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* offload engines. For example, the PDC driver works with both SPU-M and SPU2 |
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* cryptographic offload hardware. In some chips the PDC is referred to as MDE, |
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* and in others the FA2/FA+ hardware is used with this PDC driver. |
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* |
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* The PDC driver registers with the Linux mailbox framework as a mailbox |
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* controller, once for each PDC instance. Ring 0 for each PDC is registered as |
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* a mailbox channel. The PDC driver uses interrupts to determine when data |
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* transfers to and from an offload engine are complete. The PDC driver uses |
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* threaded IRQs so that response messages are handled outside of interrupt |
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* context. |
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* |
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* The PDC driver allows multiple messages to be pending in the descriptor |
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* rings. The tx_msg_start descriptor index indicates where the last message |
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* starts. The txin_numd value at this index indicates how many descriptor |
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* indexes make up the message. Similar state is kept on the receive side. When |
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* an rx interrupt indicates a response is ready, the PDC driver processes numd |
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* descriptors from the tx and rx ring, thus processing one response at a time. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/debugfs.h> |
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#include <linux/interrupt.h> |
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#include <linux/wait.h> |
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#include <linux/platform_device.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <linux/mailbox_controller.h> |
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#include <linux/mailbox/brcm-message.h> |
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#include <linux/scatterlist.h> |
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#include <linux/dma-direction.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/dmapool.h> |
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#define PDC_SUCCESS 0 |
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#define RING_ENTRY_SIZE sizeof(struct dma64dd) |
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|
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/* # entries in PDC dma ring */ |
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#define PDC_RING_ENTRIES 512 |
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/* |
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* Minimum number of ring descriptor entries that must be free to tell mailbox |
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* framework that it can submit another request |
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*/ |
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#define PDC_RING_SPACE_MIN 15 |
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#define PDC_RING_SIZE (PDC_RING_ENTRIES * RING_ENTRY_SIZE) |
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/* Rings are 8k aligned */ |
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#define RING_ALIGN_ORDER 13 |
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#define RING_ALIGN BIT(RING_ALIGN_ORDER) |
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#define RX_BUF_ALIGN_ORDER 5 |
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#define RX_BUF_ALIGN BIT(RX_BUF_ALIGN_ORDER) |
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/* descriptor bumping macros */ |
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#define XXD(x, max_mask) ((x) & (max_mask)) |
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#define TXD(x, max_mask) XXD((x), (max_mask)) |
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#define RXD(x, max_mask) XXD((x), (max_mask)) |
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#define NEXTTXD(i, max_mask) TXD((i) + 1, (max_mask)) |
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#define PREVTXD(i, max_mask) TXD((i) - 1, (max_mask)) |
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#define NEXTRXD(i, max_mask) RXD((i) + 1, (max_mask)) |
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#define PREVRXD(i, max_mask) RXD((i) - 1, (max_mask)) |
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#define NTXDACTIVE(h, t, max_mask) TXD((t) - (h), (max_mask)) |
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#define NRXDACTIVE(h, t, max_mask) RXD((t) - (h), (max_mask)) |
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|
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/* Length of BCM header at start of SPU msg, in bytes */ |
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#define BCM_HDR_LEN 8 |
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/* |
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* PDC driver reserves ringset 0 on each SPU for its own use. The driver does |
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* not currently support use of multiple ringsets on a single PDC engine. |
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*/ |
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#define PDC_RINGSET 0 |
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|
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/* |
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* Interrupt mask and status definitions. Enable interrupts for tx and rx on |
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* ring 0 |
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*/ |
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#define PDC_RCVINT_0 (16 + PDC_RINGSET) |
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#define PDC_RCVINTEN_0 BIT(PDC_RCVINT_0) |
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#define PDC_INTMASK (PDC_RCVINTEN_0) |
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#define PDC_LAZY_FRAMECOUNT 1 |
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#define PDC_LAZY_TIMEOUT 10000 |
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#define PDC_LAZY_INT (PDC_LAZY_TIMEOUT | (PDC_LAZY_FRAMECOUNT << 24)) |
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#define PDC_INTMASK_OFFSET 0x24 |
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#define PDC_INTSTATUS_OFFSET 0x20 |
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#define PDC_RCVLAZY0_OFFSET (0x30 + 4 * PDC_RINGSET) |
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#define FA_RCVLAZY0_OFFSET 0x100 |
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/* |
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* For SPU2, configure MDE_CKSUM_CONTROL to write 17 bytes of metadata |
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* before frame |
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*/ |
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#define PDC_SPU2_RESP_HDR_LEN 17 |
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#define PDC_CKSUM_CTRL BIT(27) |
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#define PDC_CKSUM_CTRL_OFFSET 0x400 |
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#define PDC_SPUM_RESP_HDR_LEN 32 |
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/* |
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* Sets the following bits for write to transmit control reg: |
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* 11 - PtyChkDisable - parity check is disabled |
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* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory |
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*/ |
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#define PDC_TX_CTL 0x000C0800 |
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/* Bit in tx control reg to enable tx channel */ |
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#define PDC_TX_ENABLE 0x1 |
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/* |
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* Sets the following bits for write to receive control reg: |
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* 7:1 - RcvOffset - size in bytes of status region at start of rx frame buf |
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* 9 - SepRxHdrDescEn - place start of new frames only in descriptors |
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* that have StartOfFrame set |
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* 10 - OflowContinue - on rx FIFO overflow, clear rx fifo, discard all |
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* remaining bytes in current frame, report error |
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* in rx frame status for current frame |
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* 11 - PtyChkDisable - parity check is disabled |
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* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory |
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*/ |
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#define PDC_RX_CTL 0x000C0E00 |
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|
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/* Bit in rx control reg to enable rx channel */ |
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#define PDC_RX_ENABLE 0x1 |
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#define CRYPTO_D64_RS0_CD_MASK ((PDC_RING_ENTRIES * RING_ENTRY_SIZE) - 1) |
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/* descriptor flags */ |
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#define D64_CTRL1_EOT BIT(28) /* end of descriptor table */ |
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#define D64_CTRL1_IOC BIT(29) /* interrupt on complete */ |
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#define D64_CTRL1_EOF BIT(30) /* end of frame */ |
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#define D64_CTRL1_SOF BIT(31) /* start of frame */ |
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#define RX_STATUS_OVERFLOW 0x00800000 |
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#define RX_STATUS_LEN 0x0000FFFF |
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#define PDC_TXREGS_OFFSET 0x200 |
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#define PDC_RXREGS_OFFSET 0x220 |
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/* Maximum size buffer the DMA engine can handle */ |
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#define PDC_DMA_BUF_MAX 16384 |
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enum pdc_hw { |
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FA_HW, /* FA2/FA+ hardware (i.e. Northstar Plus) */ |
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PDC_HW /* PDC/MDE hardware (i.e. Northstar 2, Pegasus) */ |
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}; |
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struct pdc_dma_map { |
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void *ctx; /* opaque context associated with frame */ |
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}; |
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/* dma descriptor */ |
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struct dma64dd { |
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u32 ctrl1; /* misc control bits */ |
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u32 ctrl2; /* buffer count and address extension */ |
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u32 addrlow; /* memory address of the date buffer, bits 31:0 */ |
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u32 addrhigh; /* memory address of the date buffer, bits 63:32 */ |
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}; |
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/* dma registers per channel(xmt or rcv) */ |
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struct dma64_regs { |
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u32 control; /* enable, et al */ |
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u32 ptr; /* last descriptor posted to chip */ |
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u32 addrlow; /* descriptor ring base address low 32-bits */ |
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u32 addrhigh; /* descriptor ring base address bits 63:32 */ |
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u32 status0; /* last rx descriptor written by hw */ |
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u32 status1; /* driver does not use */ |
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}; |
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/* cpp contortions to concatenate w/arg prescan */ |
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#ifndef PAD |
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#define _PADLINE(line) pad ## line |
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#define _XSTR(line) _PADLINE(line) |
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#define PAD _XSTR(__LINE__) |
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#endif /* PAD */ |
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/* dma registers. matches hw layout. */ |
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struct dma64 { |
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struct dma64_regs dmaxmt; /* dma tx */ |
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u32 PAD[2]; |
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struct dma64_regs dmarcv; /* dma rx */ |
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u32 PAD[2]; |
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}; |
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/* PDC registers */ |
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struct pdc_regs { |
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u32 devcontrol; /* 0x000 */ |
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u32 devstatus; /* 0x004 */ |
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u32 PAD; |
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u32 biststatus; /* 0x00c */ |
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u32 PAD[4]; |
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u32 intstatus; /* 0x020 */ |
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u32 intmask; /* 0x024 */ |
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u32 gptimer; /* 0x028 */ |
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u32 PAD; |
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u32 intrcvlazy_0; /* 0x030 (Only in PDC, not FA2) */ |
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u32 intrcvlazy_1; /* 0x034 (Only in PDC, not FA2) */ |
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u32 intrcvlazy_2; /* 0x038 (Only in PDC, not FA2) */ |
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u32 intrcvlazy_3; /* 0x03c (Only in PDC, not FA2) */ |
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u32 PAD[48]; |
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u32 fa_intrecvlazy; /* 0x100 (Only in FA2, not PDC) */ |
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u32 flowctlthresh; /* 0x104 */ |
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u32 wrrthresh; /* 0x108 */ |
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u32 gmac_idle_cnt_thresh; /* 0x10c */ |
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u32 PAD[4]; |
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u32 ifioaccessaddr; /* 0x120 */ |
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u32 ifioaccessbyte; /* 0x124 */ |
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u32 ifioaccessdata; /* 0x128 */ |
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u32 PAD[21]; |
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u32 phyaccess; /* 0x180 */ |
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u32 PAD; |
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u32 phycontrol; /* 0x188 */ |
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u32 txqctl; /* 0x18c */ |
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u32 rxqctl; /* 0x190 */ |
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u32 gpioselect; /* 0x194 */ |
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u32 gpio_output_en; /* 0x198 */ |
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u32 PAD; /* 0x19c */ |
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u32 txq_rxq_mem_ctl; /* 0x1a0 */ |
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u32 memory_ecc_status; /* 0x1a4 */ |
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u32 serdes_ctl; /* 0x1a8 */ |
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u32 serdes_status0; /* 0x1ac */ |
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u32 serdes_status1; /* 0x1b0 */ |
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u32 PAD[11]; /* 0x1b4-1dc */ |
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u32 clk_ctl_st; /* 0x1e0 */ |
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u32 hw_war; /* 0x1e4 (Only in PDC, not FA2) */ |
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u32 pwrctl; /* 0x1e8 */ |
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u32 PAD[5]; |
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#define PDC_NUM_DMA_RINGS 4 |
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struct dma64 dmaregs[PDC_NUM_DMA_RINGS]; /* 0x0200 - 0x2fc */ |
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/* more registers follow, but we don't use them */ |
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}; |
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/* structure for allocating/freeing DMA rings */ |
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struct pdc_ring_alloc { |
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dma_addr_t dmabase; /* DMA address of start of ring */ |
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void *vbase; /* base kernel virtual address of ring */ |
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u32 size; /* ring allocation size in bytes */ |
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}; |
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/* |
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* context associated with a receive descriptor. |
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* @rxp_ctx: opaque context associated with frame that starts at each |
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* rx ring index. |
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* @dst_sg: Scatterlist used to form reply frames beginning at a given ring |
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* index. Retained in order to unmap each sg after reply is processed. |
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* @rxin_numd: Number of rx descriptors associated with the message that starts |
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* at a descriptor index. Not set for every index. For example, |
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* if descriptor index i points to a scatterlist with 4 entries, |
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* then the next three descriptor indexes don't have a value set. |
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* @resp_hdr: Virtual address of buffer used to catch DMA rx status |
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* @resp_hdr_daddr: physical address of DMA rx status buffer |
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*/ |
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struct pdc_rx_ctx { |
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void *rxp_ctx; |
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struct scatterlist *dst_sg; |
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u32 rxin_numd; |
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void *resp_hdr; |
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dma_addr_t resp_hdr_daddr; |
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}; |
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/* PDC state structure */ |
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struct pdc_state { |
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/* Index of the PDC whose state is in this structure instance */ |
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u8 pdc_idx; |
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/* Platform device for this PDC instance */ |
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struct platform_device *pdev; |
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/* |
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* Each PDC instance has a mailbox controller. PDC receives request |
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* messages through mailboxes, and sends response messages through the |
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* mailbox framework. |
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*/ |
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struct mbox_controller mbc; |
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unsigned int pdc_irq; |
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/* tasklet for deferred processing after DMA rx interrupt */ |
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struct tasklet_struct rx_tasklet; |
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/* Number of bytes of receive status prior to each rx frame */ |
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u32 rx_status_len; |
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/* Whether a BCM header is prepended to each frame */ |
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bool use_bcm_hdr; |
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/* Sum of length of BCM header and rx status header */ |
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u32 pdc_resp_hdr_len; |
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/* The base virtual address of DMA hw registers */ |
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void __iomem *pdc_reg_vbase; |
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/* Pool for allocation of DMA rings */ |
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struct dma_pool *ring_pool; |
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/* Pool for allocation of metadata buffers for response messages */ |
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struct dma_pool *rx_buf_pool; |
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/* |
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* The base virtual address of DMA tx/rx descriptor rings. Corresponding |
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* DMA address and size of ring allocation. |
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*/ |
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struct pdc_ring_alloc tx_ring_alloc; |
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struct pdc_ring_alloc rx_ring_alloc; |
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struct pdc_regs *regs; /* start of PDC registers */ |
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struct dma64_regs *txregs_64; /* dma tx engine registers */ |
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struct dma64_regs *rxregs_64; /* dma rx engine registers */ |
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/* |
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* Arrays of PDC_RING_ENTRIES descriptors |
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* To use multiple ringsets, this needs to be extended |
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*/ |
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struct dma64dd *txd_64; /* tx descriptor ring */ |
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struct dma64dd *rxd_64; /* rx descriptor ring */ |
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/* descriptor ring sizes */ |
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u32 ntxd; /* # tx descriptors */ |
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u32 nrxd; /* # rx descriptors */ |
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u32 nrxpost; /* # rx buffers to keep posted */ |
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u32 ntxpost; /* max number of tx buffers that can be posted */ |
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/* |
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* Index of next tx descriptor to reclaim. That is, the descriptor |
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* index of the oldest tx buffer for which the host has yet to process |
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* the corresponding response. |
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*/ |
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u32 txin; |
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/* |
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* Index of the first receive descriptor for the sequence of |
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* message fragments currently under construction. Used to build up |
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* the rxin_numd count for a message. Updated to rxout when the host |
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* starts a new sequence of rx buffers for a new message. |
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*/ |
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u32 tx_msg_start; |
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/* Index of next tx descriptor to post. */ |
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u32 txout; |
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/* |
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* Number of tx descriptors associated with the message that starts |
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* at this tx descriptor index. |
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*/ |
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u32 txin_numd[PDC_RING_ENTRIES]; |
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/* |
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* Index of next rx descriptor to reclaim. This is the index of |
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* the next descriptor whose data has yet to be processed by the host. |
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*/ |
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u32 rxin; |
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/* |
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* Index of the first receive descriptor for the sequence of |
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* message fragments currently under construction. Used to build up |
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* the rxin_numd count for a message. Updated to rxout when the host |
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* starts a new sequence of rx buffers for a new message. |
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*/ |
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u32 rx_msg_start; |
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/* |
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* Saved value of current hardware rx descriptor index. |
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* The last rx buffer written by the hw is the index previous to |
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* this one. |
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*/ |
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u32 last_rx_curr; |
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/* Index of next rx descriptor to post. */ |
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u32 rxout; |
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struct pdc_rx_ctx rx_ctx[PDC_RING_ENTRIES]; |
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/* |
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* Scatterlists used to form request and reply frames beginning at a |
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* given ring index. Retained in order to unmap each sg after reply |
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* is processed |
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*/ |
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struct scatterlist *src_sg[PDC_RING_ENTRIES]; |
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/* counters */ |
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u32 pdc_requests; /* number of request messages submitted */ |
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u32 pdc_replies; /* number of reply messages received */ |
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u32 last_tx_not_done; /* too few tx descriptors to indicate done */ |
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u32 tx_ring_full; /* unable to accept msg because tx ring full */ |
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u32 rx_ring_full; /* unable to accept msg because rx ring full */ |
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u32 txnobuf; /* unable to create tx descriptor */ |
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u32 rxnobuf; /* unable to create rx descriptor */ |
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u32 rx_oflow; /* count of rx overflows */ |
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|
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/* hardware type - FA2 or PDC/MDE */ |
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enum pdc_hw hw_type; |
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}; |
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|
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/* Global variables */ |
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struct pdc_globals { |
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/* Actual number of SPUs in hardware, as reported by device tree */ |
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u32 num_spu; |
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}; |
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static struct pdc_globals pdcg; |
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/* top level debug FS directory for PDC driver */ |
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static struct dentry *debugfs_dir; |
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static ssize_t pdc_debugfs_read(struct file *filp, char __user *ubuf, |
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size_t count, loff_t *offp) |
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{ |
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struct pdc_state *pdcs; |
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char *buf; |
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ssize_t ret, out_offset, out_count; |
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out_count = 512; |
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buf = kmalloc(out_count, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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pdcs = filp->private_data; |
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out_offset = 0; |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"SPU %u stats:\n", pdcs->pdc_idx); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"PDC requests....................%u\n", |
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pdcs->pdc_requests); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"PDC responses...................%u\n", |
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pdcs->pdc_replies); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Tx not done.....................%u\n", |
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pdcs->last_tx_not_done); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Tx ring full....................%u\n", |
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pdcs->tx_ring_full); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Rx ring full....................%u\n", |
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pdcs->rx_ring_full); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Tx desc write fail. Ring full...%u\n", |
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pdcs->txnobuf); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Rx desc write fail. Ring full...%u\n", |
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pdcs->rxnobuf); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Receive overflow................%u\n", |
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pdcs->rx_oflow); |
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out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
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"Num frags in rx ring............%u\n", |
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NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr, |
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pdcs->nrxpost)); |
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|
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if (out_offset > out_count) |
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out_offset = out_count; |
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|
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ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); |
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kfree(buf); |
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return ret; |
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} |
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|
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static const struct file_operations pdc_debugfs_stats = { |
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.owner = THIS_MODULE, |
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.open = simple_open, |
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.read = pdc_debugfs_read, |
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}; |
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|
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/** |
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* pdc_setup_debugfs() - Create the debug FS directories. If the top-level |
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* directory has not yet been created, create it now. Create a stats file in |
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* this directory for a SPU. |
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* @pdcs: PDC state structure |
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*/ |
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static void pdc_setup_debugfs(struct pdc_state *pdcs) |
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{ |
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char spu_stats_name[16]; |
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|
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if (!debugfs_initialized()) |
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return; |
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|
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snprintf(spu_stats_name, 16, "pdc%d_stats", pdcs->pdc_idx); |
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if (!debugfs_dir) |
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debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); |
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|
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/* S_IRUSR == 0400 */ |
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debugfs_create_file(spu_stats_name, 0400, debugfs_dir, pdcs, |
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&pdc_debugfs_stats); |
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} |
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|
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static void pdc_free_debugfs(void) |
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{ |
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debugfs_remove_recursive(debugfs_dir); |
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debugfs_dir = NULL; |
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} |
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|
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/** |
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* pdc_build_rxd() - Build DMA descriptor to receive SPU result. |
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* @pdcs: PDC state for SPU that will generate result |
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* @dma_addr: DMA address of buffer that descriptor is being built for |
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* @buf_len: Length of the receive buffer, in bytes |
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* @flags: Flags to be stored in descriptor |
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*/ |
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static inline void |
|
pdc_build_rxd(struct pdc_state *pdcs, dma_addr_t dma_addr, |
|
u32 buf_len, u32 flags) |
|
{ |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct dma64dd *rxd = &pdcs->rxd_64[pdcs->rxout]; |
|
|
|
dev_dbg(dev, |
|
"Writing rx descriptor for PDC %u at index %u with length %u. flags %#x\n", |
|
pdcs->pdc_idx, pdcs->rxout, buf_len, flags); |
|
|
|
rxd->addrlow = cpu_to_le32(lower_32_bits(dma_addr)); |
|
rxd->addrhigh = cpu_to_le32(upper_32_bits(dma_addr)); |
|
rxd->ctrl1 = cpu_to_le32(flags); |
|
rxd->ctrl2 = cpu_to_le32(buf_len); |
|
|
|
/* bump ring index and return */ |
|
pdcs->rxout = NEXTRXD(pdcs->rxout, pdcs->nrxpost); |
|
} |
|
|
|
/** |
|
* pdc_build_txd() - Build a DMA descriptor to transmit a SPU request to |
|
* hardware. |
|
* @pdcs: PDC state for the SPU that will process this request |
|
* @dma_addr: DMA address of packet to be transmitted |
|
* @buf_len: Length of tx buffer, in bytes |
|
* @flags: Flags to be stored in descriptor |
|
*/ |
|
static inline void |
|
pdc_build_txd(struct pdc_state *pdcs, dma_addr_t dma_addr, u32 buf_len, |
|
u32 flags) |
|
{ |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct dma64dd *txd = &pdcs->txd_64[pdcs->txout]; |
|
|
|
dev_dbg(dev, |
|
"Writing tx descriptor for PDC %u at index %u with length %u, flags %#x\n", |
|
pdcs->pdc_idx, pdcs->txout, buf_len, flags); |
|
|
|
txd->addrlow = cpu_to_le32(lower_32_bits(dma_addr)); |
|
txd->addrhigh = cpu_to_le32(upper_32_bits(dma_addr)); |
|
txd->ctrl1 = cpu_to_le32(flags); |
|
txd->ctrl2 = cpu_to_le32(buf_len); |
|
|
|
/* bump ring index and return */ |
|
pdcs->txout = NEXTTXD(pdcs->txout, pdcs->ntxpost); |
|
} |
|
|
|
/** |
|
* pdc_receive_one() - Receive a response message from a given SPU. |
|
* @pdcs: PDC state for the SPU to receive from |
|
* |
|
* When the return code indicates success, the response message is available in |
|
* the receive buffers provided prior to submission of the request. |
|
* |
|
* Return: PDC_SUCCESS if one or more receive descriptors was processed |
|
* -EAGAIN indicates that no response message is available |
|
* -EIO an error occurred |
|
*/ |
|
static int |
|
pdc_receive_one(struct pdc_state *pdcs) |
|
{ |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct mbox_controller *mbc; |
|
struct mbox_chan *chan; |
|
struct brcm_message mssg; |
|
u32 len, rx_status; |
|
u32 num_frags; |
|
u8 *resp_hdr; /* virtual addr of start of resp message DMA header */ |
|
u32 frags_rdy; /* number of fragments ready to read */ |
|
u32 rx_idx; /* ring index of start of receive frame */ |
|
dma_addr_t resp_hdr_daddr; |
|
struct pdc_rx_ctx *rx_ctx; |
|
|
|
mbc = &pdcs->mbc; |
|
chan = &mbc->chans[0]; |
|
mssg.type = BRCM_MESSAGE_SPU; |
|
|
|
/* |
|
* return if a complete response message is not yet ready. |
|
* rxin_numd[rxin] is the number of fragments in the next msg |
|
* to read. |
|
*/ |
|
frags_rdy = NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr, pdcs->nrxpost); |
|
if ((frags_rdy == 0) || |
|
(frags_rdy < pdcs->rx_ctx[pdcs->rxin].rxin_numd)) |
|
/* No response ready */ |
|
return -EAGAIN; |
|
|
|
num_frags = pdcs->txin_numd[pdcs->txin]; |
|
WARN_ON(num_frags == 0); |
|
|
|
dma_unmap_sg(dev, pdcs->src_sg[pdcs->txin], |
|
sg_nents(pdcs->src_sg[pdcs->txin]), DMA_TO_DEVICE); |
|
|
|
pdcs->txin = (pdcs->txin + num_frags) & pdcs->ntxpost; |
|
|
|
dev_dbg(dev, "PDC %u reclaimed %d tx descriptors", |
|
pdcs->pdc_idx, num_frags); |
|
|
|
rx_idx = pdcs->rxin; |
|
rx_ctx = &pdcs->rx_ctx[rx_idx]; |
|
num_frags = rx_ctx->rxin_numd; |
|
/* Return opaque context with result */ |
|
mssg.ctx = rx_ctx->rxp_ctx; |
|
rx_ctx->rxp_ctx = NULL; |
|
resp_hdr = rx_ctx->resp_hdr; |
|
resp_hdr_daddr = rx_ctx->resp_hdr_daddr; |
|
dma_unmap_sg(dev, rx_ctx->dst_sg, sg_nents(rx_ctx->dst_sg), |
|
DMA_FROM_DEVICE); |
|
|
|
pdcs->rxin = (pdcs->rxin + num_frags) & pdcs->nrxpost; |
|
|
|
dev_dbg(dev, "PDC %u reclaimed %d rx descriptors", |
|
pdcs->pdc_idx, num_frags); |
|
|
|
dev_dbg(dev, |
|
"PDC %u txin %u, txout %u, rxin %u, rxout %u, last_rx_curr %u\n", |
|
pdcs->pdc_idx, pdcs->txin, pdcs->txout, pdcs->rxin, |
|
pdcs->rxout, pdcs->last_rx_curr); |
|
|
|
if (pdcs->pdc_resp_hdr_len == PDC_SPUM_RESP_HDR_LEN) { |
|
/* |
|
* For SPU-M, get length of response msg and rx overflow status. |
|
*/ |
|
rx_status = *((u32 *)resp_hdr); |
|
len = rx_status & RX_STATUS_LEN; |
|
dev_dbg(dev, |
|
"SPU response length %u bytes", len); |
|
if (unlikely(((rx_status & RX_STATUS_OVERFLOW) || (!len)))) { |
|
if (rx_status & RX_STATUS_OVERFLOW) { |
|
dev_err_ratelimited(dev, |
|
"crypto receive overflow"); |
|
pdcs->rx_oflow++; |
|
} else { |
|
dev_info_ratelimited(dev, "crypto rx len = 0"); |
|
} |
|
return -EIO; |
|
} |
|
} |
|
|
|
dma_pool_free(pdcs->rx_buf_pool, resp_hdr, resp_hdr_daddr); |
|
|
|
mbox_chan_received_data(chan, &mssg); |
|
|
|
pdcs->pdc_replies++; |
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_receive() - Process as many responses as are available in the rx ring. |
|
* @pdcs: PDC state |
|
* |
|
* Called within the hard IRQ. |
|
* Return: |
|
*/ |
|
static int |
|
pdc_receive(struct pdc_state *pdcs) |
|
{ |
|
int rx_status; |
|
|
|
/* read last_rx_curr from register once */ |
|
pdcs->last_rx_curr = |
|
(ioread32((const void __iomem *)&pdcs->rxregs_64->status0) & |
|
CRYPTO_D64_RS0_CD_MASK) / RING_ENTRY_SIZE; |
|
|
|
do { |
|
/* Could be many frames ready */ |
|
rx_status = pdc_receive_one(pdcs); |
|
} while (rx_status == PDC_SUCCESS); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* pdc_tx_list_sg_add() - Add the buffers in a scatterlist to the transmit |
|
* descriptors for a given SPU. The scatterlist buffers contain the data for a |
|
* SPU request message. |
|
* @spu_idx: The index of the SPU to submit the request to, [0, max_spu) |
|
* @sg: Scatterlist whose buffers contain part of the SPU request |
|
* |
|
* If a scatterlist buffer is larger than PDC_DMA_BUF_MAX, multiple descriptors |
|
* are written for that buffer, each <= PDC_DMA_BUF_MAX byte in length. |
|
* |
|
* Return: PDC_SUCCESS if successful |
|
* < 0 otherwise |
|
*/ |
|
static int pdc_tx_list_sg_add(struct pdc_state *pdcs, struct scatterlist *sg) |
|
{ |
|
u32 flags = 0; |
|
u32 eot; |
|
u32 tx_avail; |
|
|
|
/* |
|
* Num descriptors needed. Conservatively assume we need a descriptor |
|
* for every entry in sg. |
|
*/ |
|
u32 num_desc; |
|
u32 desc_w = 0; /* Number of tx descriptors written */ |
|
u32 bufcnt; /* Number of bytes of buffer pointed to by descriptor */ |
|
dma_addr_t databufptr; /* DMA address to put in descriptor */ |
|
|
|
num_desc = (u32)sg_nents(sg); |
|
|
|
/* check whether enough tx descriptors are available */ |
|
tx_avail = pdcs->ntxpost - NTXDACTIVE(pdcs->txin, pdcs->txout, |
|
pdcs->ntxpost); |
|
if (unlikely(num_desc > tx_avail)) { |
|
pdcs->txnobuf++; |
|
return -ENOSPC; |
|
} |
|
|
|
/* build tx descriptors */ |
|
if (pdcs->tx_msg_start == pdcs->txout) { |
|
/* Start of frame */ |
|
pdcs->txin_numd[pdcs->tx_msg_start] = 0; |
|
pdcs->src_sg[pdcs->txout] = sg; |
|
flags = D64_CTRL1_SOF; |
|
} |
|
|
|
while (sg) { |
|
if (unlikely(pdcs->txout == (pdcs->ntxd - 1))) |
|
eot = D64_CTRL1_EOT; |
|
else |
|
eot = 0; |
|
|
|
/* |
|
* If sg buffer larger than PDC limit, split across |
|
* multiple descriptors |
|
*/ |
|
bufcnt = sg_dma_len(sg); |
|
databufptr = sg_dma_address(sg); |
|
while (bufcnt > PDC_DMA_BUF_MAX) { |
|
pdc_build_txd(pdcs, databufptr, PDC_DMA_BUF_MAX, |
|
flags | eot); |
|
desc_w++; |
|
bufcnt -= PDC_DMA_BUF_MAX; |
|
databufptr += PDC_DMA_BUF_MAX; |
|
if (unlikely(pdcs->txout == (pdcs->ntxd - 1))) |
|
eot = D64_CTRL1_EOT; |
|
else |
|
eot = 0; |
|
} |
|
sg = sg_next(sg); |
|
if (!sg) |
|
/* Writing last descriptor for frame */ |
|
flags |= (D64_CTRL1_EOF | D64_CTRL1_IOC); |
|
pdc_build_txd(pdcs, databufptr, bufcnt, flags | eot); |
|
desc_w++; |
|
/* Clear start of frame after first descriptor */ |
|
flags &= ~D64_CTRL1_SOF; |
|
} |
|
pdcs->txin_numd[pdcs->tx_msg_start] += desc_w; |
|
|
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_tx_list_final() - Initiate DMA transfer of last frame written to tx |
|
* ring. |
|
* @pdcs: PDC state for SPU to process the request |
|
* |
|
* Sets the index of the last descriptor written in both the rx and tx ring. |
|
* |
|
* Return: PDC_SUCCESS |
|
*/ |
|
static int pdc_tx_list_final(struct pdc_state *pdcs) |
|
{ |
|
/* |
|
* write barrier to ensure all register writes are complete |
|
* before chip starts to process new request |
|
*/ |
|
wmb(); |
|
iowrite32(pdcs->rxout << 4, &pdcs->rxregs_64->ptr); |
|
iowrite32(pdcs->txout << 4, &pdcs->txregs_64->ptr); |
|
pdcs->pdc_requests++; |
|
|
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_rx_list_init() - Start a new receive descriptor list for a given PDC. |
|
* @pdcs: PDC state for SPU handling request |
|
* @dst_sg: scatterlist providing rx buffers for response to be returned to |
|
* mailbox client |
|
* @ctx: Opaque context for this request |
|
* |
|
* Posts a single receive descriptor to hold the metadata that precedes a |
|
* response. For example, with SPU-M, the metadata is a 32-byte DMA header and |
|
* an 8-byte BCM header. Moves the msg_start descriptor indexes for both tx and |
|
* rx to indicate the start of a new message. |
|
* |
|
* Return: PDC_SUCCESS if successful |
|
* < 0 if an error (e.g., rx ring is full) |
|
*/ |
|
static int pdc_rx_list_init(struct pdc_state *pdcs, struct scatterlist *dst_sg, |
|
void *ctx) |
|
{ |
|
u32 flags = 0; |
|
u32 rx_avail; |
|
u32 rx_pkt_cnt = 1; /* Adding a single rx buffer */ |
|
dma_addr_t daddr; |
|
void *vaddr; |
|
struct pdc_rx_ctx *rx_ctx; |
|
|
|
rx_avail = pdcs->nrxpost - NRXDACTIVE(pdcs->rxin, pdcs->rxout, |
|
pdcs->nrxpost); |
|
if (unlikely(rx_pkt_cnt > rx_avail)) { |
|
pdcs->rxnobuf++; |
|
return -ENOSPC; |
|
} |
|
|
|
/* allocate a buffer for the dma rx status */ |
|
vaddr = dma_pool_zalloc(pdcs->rx_buf_pool, GFP_ATOMIC, &daddr); |
|
if (unlikely(!vaddr)) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Update msg_start indexes for both tx and rx to indicate the start |
|
* of a new sequence of descriptor indexes that contain the fragments |
|
* of the same message. |
|
*/ |
|
pdcs->rx_msg_start = pdcs->rxout; |
|
pdcs->tx_msg_start = pdcs->txout; |
|
|
|
/* This is always the first descriptor in the receive sequence */ |
|
flags = D64_CTRL1_SOF; |
|
pdcs->rx_ctx[pdcs->rx_msg_start].rxin_numd = 1; |
|
|
|
if (unlikely(pdcs->rxout == (pdcs->nrxd - 1))) |
|
flags |= D64_CTRL1_EOT; |
|
|
|
rx_ctx = &pdcs->rx_ctx[pdcs->rxout]; |
|
rx_ctx->rxp_ctx = ctx; |
|
rx_ctx->dst_sg = dst_sg; |
|
rx_ctx->resp_hdr = vaddr; |
|
rx_ctx->resp_hdr_daddr = daddr; |
|
pdc_build_rxd(pdcs, daddr, pdcs->pdc_resp_hdr_len, flags); |
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_rx_list_sg_add() - Add the buffers in a scatterlist to the receive |
|
* descriptors for a given SPU. The caller must have already DMA mapped the |
|
* scatterlist. |
|
* @spu_idx: Indicates which SPU the buffers are for |
|
* @sg: Scatterlist whose buffers are added to the receive ring |
|
* |
|
* If a receive buffer in the scatterlist is larger than PDC_DMA_BUF_MAX, |
|
* multiple receive descriptors are written, each with a buffer <= |
|
* PDC_DMA_BUF_MAX. |
|
* |
|
* Return: PDC_SUCCESS if successful |
|
* < 0 otherwise (e.g., receive ring is full) |
|
*/ |
|
static int pdc_rx_list_sg_add(struct pdc_state *pdcs, struct scatterlist *sg) |
|
{ |
|
u32 flags = 0; |
|
u32 rx_avail; |
|
|
|
/* |
|
* Num descriptors needed. Conservatively assume we need a descriptor |
|
* for every entry from our starting point in the scatterlist. |
|
*/ |
|
u32 num_desc; |
|
u32 desc_w = 0; /* Number of tx descriptors written */ |
|
u32 bufcnt; /* Number of bytes of buffer pointed to by descriptor */ |
|
dma_addr_t databufptr; /* DMA address to put in descriptor */ |
|
|
|
num_desc = (u32)sg_nents(sg); |
|
|
|
rx_avail = pdcs->nrxpost - NRXDACTIVE(pdcs->rxin, pdcs->rxout, |
|
pdcs->nrxpost); |
|
if (unlikely(num_desc > rx_avail)) { |
|
pdcs->rxnobuf++; |
|
return -ENOSPC; |
|
} |
|
|
|
while (sg) { |
|
if (unlikely(pdcs->rxout == (pdcs->nrxd - 1))) |
|
flags = D64_CTRL1_EOT; |
|
else |
|
flags = 0; |
|
|
|
/* |
|
* If sg buffer larger than PDC limit, split across |
|
* multiple descriptors |
|
*/ |
|
bufcnt = sg_dma_len(sg); |
|
databufptr = sg_dma_address(sg); |
|
while (bufcnt > PDC_DMA_BUF_MAX) { |
|
pdc_build_rxd(pdcs, databufptr, PDC_DMA_BUF_MAX, flags); |
|
desc_w++; |
|
bufcnt -= PDC_DMA_BUF_MAX; |
|
databufptr += PDC_DMA_BUF_MAX; |
|
if (unlikely(pdcs->rxout == (pdcs->nrxd - 1))) |
|
flags = D64_CTRL1_EOT; |
|
else |
|
flags = 0; |
|
} |
|
pdc_build_rxd(pdcs, databufptr, bufcnt, flags); |
|
desc_w++; |
|
sg = sg_next(sg); |
|
} |
|
pdcs->rx_ctx[pdcs->rx_msg_start].rxin_numd += desc_w; |
|
|
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_irq_handler() - Interrupt handler called in interrupt context. |
|
* @irq: Interrupt number that has fired |
|
* @data: device struct for DMA engine that generated the interrupt |
|
* |
|
* We have to clear the device interrupt status flags here. So cache the |
|
* status for later use in the thread function. Other than that, just return |
|
* WAKE_THREAD to invoke the thread function. |
|
* |
|
* Return: IRQ_WAKE_THREAD if interrupt is ours |
|
* IRQ_NONE otherwise |
|
*/ |
|
static irqreturn_t pdc_irq_handler(int irq, void *data) |
|
{ |
|
struct device *dev = (struct device *)data; |
|
struct pdc_state *pdcs = dev_get_drvdata(dev); |
|
u32 intstatus = ioread32(pdcs->pdc_reg_vbase + PDC_INTSTATUS_OFFSET); |
|
|
|
if (unlikely(intstatus == 0)) |
|
return IRQ_NONE; |
|
|
|
/* Disable interrupts until soft handler runs */ |
|
iowrite32(0, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET); |
|
|
|
/* Clear interrupt flags in device */ |
|
iowrite32(intstatus, pdcs->pdc_reg_vbase + PDC_INTSTATUS_OFFSET); |
|
|
|
/* Wakeup IRQ thread */ |
|
tasklet_schedule(&pdcs->rx_tasklet); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* pdc_tasklet_cb() - Tasklet callback that runs the deferred processing after |
|
* a DMA receive interrupt. Reenables the receive interrupt. |
|
* @data: PDC state structure |
|
*/ |
|
static void pdc_tasklet_cb(struct tasklet_struct *t) |
|
{ |
|
struct pdc_state *pdcs = from_tasklet(pdcs, t, rx_tasklet); |
|
|
|
pdc_receive(pdcs); |
|
|
|
/* reenable interrupts */ |
|
iowrite32(PDC_INTMASK, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET); |
|
} |
|
|
|
/** |
|
* pdc_ring_init() - Allocate DMA rings and initialize constant fields of |
|
* descriptors in one ringset. |
|
* @pdcs: PDC instance state |
|
* @ringset: index of ringset being used |
|
* |
|
* Return: PDC_SUCCESS if ring initialized |
|
* < 0 otherwise |
|
*/ |
|
static int pdc_ring_init(struct pdc_state *pdcs, int ringset) |
|
{ |
|
int i; |
|
int err = PDC_SUCCESS; |
|
struct dma64 *dma_reg; |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct pdc_ring_alloc tx; |
|
struct pdc_ring_alloc rx; |
|
|
|
/* Allocate tx ring */ |
|
tx.vbase = dma_pool_zalloc(pdcs->ring_pool, GFP_KERNEL, &tx.dmabase); |
|
if (unlikely(!tx.vbase)) { |
|
err = -ENOMEM; |
|
goto done; |
|
} |
|
|
|
/* Allocate rx ring */ |
|
rx.vbase = dma_pool_zalloc(pdcs->ring_pool, GFP_KERNEL, &rx.dmabase); |
|
if (unlikely(!rx.vbase)) { |
|
err = -ENOMEM; |
|
goto fail_dealloc; |
|
} |
|
|
|
dev_dbg(dev, " - base DMA addr of tx ring %pad", &tx.dmabase); |
|
dev_dbg(dev, " - base virtual addr of tx ring %p", tx.vbase); |
|
dev_dbg(dev, " - base DMA addr of rx ring %pad", &rx.dmabase); |
|
dev_dbg(dev, " - base virtual addr of rx ring %p", rx.vbase); |
|
|
|
memcpy(&pdcs->tx_ring_alloc, &tx, sizeof(tx)); |
|
memcpy(&pdcs->rx_ring_alloc, &rx, sizeof(rx)); |
|
|
|
pdcs->rxin = 0; |
|
pdcs->rx_msg_start = 0; |
|
pdcs->last_rx_curr = 0; |
|
pdcs->rxout = 0; |
|
pdcs->txin = 0; |
|
pdcs->tx_msg_start = 0; |
|
pdcs->txout = 0; |
|
|
|
/* Set descriptor array base addresses */ |
|
pdcs->txd_64 = (struct dma64dd *)pdcs->tx_ring_alloc.vbase; |
|
pdcs->rxd_64 = (struct dma64dd *)pdcs->rx_ring_alloc.vbase; |
|
|
|
/* Tell device the base DMA address of each ring */ |
|
dma_reg = &pdcs->regs->dmaregs[ringset]; |
|
|
|
/* But first disable DMA and set curptr to 0 for both TX & RX */ |
|
iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control); |
|
iowrite32((PDC_RX_CTL + (pdcs->rx_status_len << 1)), |
|
&dma_reg->dmarcv.control); |
|
iowrite32(0, &dma_reg->dmaxmt.ptr); |
|
iowrite32(0, &dma_reg->dmarcv.ptr); |
|
|
|
/* Set base DMA addresses */ |
|
iowrite32(lower_32_bits(pdcs->tx_ring_alloc.dmabase), |
|
&dma_reg->dmaxmt.addrlow); |
|
iowrite32(upper_32_bits(pdcs->tx_ring_alloc.dmabase), |
|
&dma_reg->dmaxmt.addrhigh); |
|
|
|
iowrite32(lower_32_bits(pdcs->rx_ring_alloc.dmabase), |
|
&dma_reg->dmarcv.addrlow); |
|
iowrite32(upper_32_bits(pdcs->rx_ring_alloc.dmabase), |
|
&dma_reg->dmarcv.addrhigh); |
|
|
|
/* Re-enable DMA */ |
|
iowrite32(PDC_TX_CTL | PDC_TX_ENABLE, &dma_reg->dmaxmt.control); |
|
iowrite32((PDC_RX_CTL | PDC_RX_ENABLE | (pdcs->rx_status_len << 1)), |
|
&dma_reg->dmarcv.control); |
|
|
|
/* Initialize descriptors */ |
|
for (i = 0; i < PDC_RING_ENTRIES; i++) { |
|
/* Every tx descriptor can be used for start of frame. */ |
|
if (i != pdcs->ntxpost) { |
|
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOF, |
|
&pdcs->txd_64[i].ctrl1); |
|
} else { |
|
/* Last descriptor in ringset. Set End of Table. */ |
|
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOF | |
|
D64_CTRL1_EOT, &pdcs->txd_64[i].ctrl1); |
|
} |
|
|
|
/* Every rx descriptor can be used for start of frame */ |
|
if (i != pdcs->nrxpost) { |
|
iowrite32(D64_CTRL1_SOF, |
|
&pdcs->rxd_64[i].ctrl1); |
|
} else { |
|
/* Last descriptor in ringset. Set End of Table. */ |
|
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOT, |
|
&pdcs->rxd_64[i].ctrl1); |
|
} |
|
} |
|
return PDC_SUCCESS; |
|
|
|
fail_dealloc: |
|
dma_pool_free(pdcs->ring_pool, tx.vbase, tx.dmabase); |
|
done: |
|
return err; |
|
} |
|
|
|
static void pdc_ring_free(struct pdc_state *pdcs) |
|
{ |
|
if (pdcs->tx_ring_alloc.vbase) { |
|
dma_pool_free(pdcs->ring_pool, pdcs->tx_ring_alloc.vbase, |
|
pdcs->tx_ring_alloc.dmabase); |
|
pdcs->tx_ring_alloc.vbase = NULL; |
|
} |
|
|
|
if (pdcs->rx_ring_alloc.vbase) { |
|
dma_pool_free(pdcs->ring_pool, pdcs->rx_ring_alloc.vbase, |
|
pdcs->rx_ring_alloc.dmabase); |
|
pdcs->rx_ring_alloc.vbase = NULL; |
|
} |
|
} |
|
|
|
/** |
|
* pdc_desc_count() - Count the number of DMA descriptors that will be required |
|
* for a given scatterlist. Account for the max length of a DMA buffer. |
|
* @sg: Scatterlist to be DMA'd |
|
* Return: Number of descriptors required |
|
*/ |
|
static u32 pdc_desc_count(struct scatterlist *sg) |
|
{ |
|
u32 cnt = 0; |
|
|
|
while (sg) { |
|
cnt += ((sg->length / PDC_DMA_BUF_MAX) + 1); |
|
sg = sg_next(sg); |
|
} |
|
return cnt; |
|
} |
|
|
|
/** |
|
* pdc_rings_full() - Check whether the tx ring has room for tx_cnt descriptors |
|
* and the rx ring has room for rx_cnt descriptors. |
|
* @pdcs: PDC state |
|
* @tx_cnt: The number of descriptors required in the tx ring |
|
* @rx_cnt: The number of descriptors required i the rx ring |
|
* |
|
* Return: true if one of the rings does not have enough space |
|
* false if sufficient space is available in both rings |
|
*/ |
|
static bool pdc_rings_full(struct pdc_state *pdcs, int tx_cnt, int rx_cnt) |
|
{ |
|
u32 rx_avail; |
|
u32 tx_avail; |
|
bool full = false; |
|
|
|
/* Check if the tx and rx rings are likely to have enough space */ |
|
rx_avail = pdcs->nrxpost - NRXDACTIVE(pdcs->rxin, pdcs->rxout, |
|
pdcs->nrxpost); |
|
if (unlikely(rx_cnt > rx_avail)) { |
|
pdcs->rx_ring_full++; |
|
full = true; |
|
} |
|
|
|
if (likely(!full)) { |
|
tx_avail = pdcs->ntxpost - NTXDACTIVE(pdcs->txin, pdcs->txout, |
|
pdcs->ntxpost); |
|
if (unlikely(tx_cnt > tx_avail)) { |
|
pdcs->tx_ring_full++; |
|
full = true; |
|
} |
|
} |
|
return full; |
|
} |
|
|
|
/** |
|
* pdc_last_tx_done() - If both the tx and rx rings have at least |
|
* PDC_RING_SPACE_MIN descriptors available, then indicate that the mailbox |
|
* framework can submit another message. |
|
* @chan: mailbox channel to check |
|
* Return: true if PDC can accept another message on this channel |
|
*/ |
|
static bool pdc_last_tx_done(struct mbox_chan *chan) |
|
{ |
|
struct pdc_state *pdcs = chan->con_priv; |
|
bool ret; |
|
|
|
if (unlikely(pdc_rings_full(pdcs, PDC_RING_SPACE_MIN, |
|
PDC_RING_SPACE_MIN))) { |
|
pdcs->last_tx_not_done++; |
|
ret = false; |
|
} else { |
|
ret = true; |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* pdc_send_data() - mailbox send_data function |
|
* @chan: The mailbox channel on which the data is sent. The channel |
|
* corresponds to a DMA ringset. |
|
* @data: The mailbox message to be sent. The message must be a |
|
* brcm_message structure. |
|
* |
|
* This function is registered as the send_data function for the mailbox |
|
* controller. From the destination scatterlist in the mailbox message, it |
|
* creates a sequence of receive descriptors in the rx ring. From the source |
|
* scatterlist, it creates a sequence of transmit descriptors in the tx ring. |
|
* After creating the descriptors, it writes the rx ptr and tx ptr registers to |
|
* initiate the DMA transfer. |
|
* |
|
* This function does the DMA map and unmap of the src and dst scatterlists in |
|
* the mailbox message. |
|
* |
|
* Return: 0 if successful |
|
* -ENOTSUPP if the mailbox message is a type this driver does not |
|
* support |
|
* < 0 if an error |
|
*/ |
|
static int pdc_send_data(struct mbox_chan *chan, void *data) |
|
{ |
|
struct pdc_state *pdcs = chan->con_priv; |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct brcm_message *mssg = data; |
|
int err = PDC_SUCCESS; |
|
int src_nent; |
|
int dst_nent; |
|
int nent; |
|
u32 tx_desc_req; |
|
u32 rx_desc_req; |
|
|
|
if (unlikely(mssg->type != BRCM_MESSAGE_SPU)) |
|
return -ENOTSUPP; |
|
|
|
src_nent = sg_nents(mssg->spu.src); |
|
if (likely(src_nent)) { |
|
nent = dma_map_sg(dev, mssg->spu.src, src_nent, DMA_TO_DEVICE); |
|
if (unlikely(nent == 0)) |
|
return -EIO; |
|
} |
|
|
|
dst_nent = sg_nents(mssg->spu.dst); |
|
if (likely(dst_nent)) { |
|
nent = dma_map_sg(dev, mssg->spu.dst, dst_nent, |
|
DMA_FROM_DEVICE); |
|
if (unlikely(nent == 0)) { |
|
dma_unmap_sg(dev, mssg->spu.src, src_nent, |
|
DMA_TO_DEVICE); |
|
return -EIO; |
|
} |
|
} |
|
|
|
/* |
|
* Check if the tx and rx rings have enough space. Do this prior to |
|
* writing any tx or rx descriptors. Need to ensure that we do not write |
|
* a partial set of descriptors, or write just rx descriptors but |
|
* corresponding tx descriptors don't fit. Note that we want this check |
|
* and the entire sequence of descriptor to happen without another |
|
* thread getting in. The channel spin lock in the mailbox framework |
|
* ensures this. |
|
*/ |
|
tx_desc_req = pdc_desc_count(mssg->spu.src); |
|
rx_desc_req = pdc_desc_count(mssg->spu.dst); |
|
if (unlikely(pdc_rings_full(pdcs, tx_desc_req, rx_desc_req + 1))) |
|
return -ENOSPC; |
|
|
|
/* Create rx descriptors to SPU catch response */ |
|
err = pdc_rx_list_init(pdcs, mssg->spu.dst, mssg->ctx); |
|
err |= pdc_rx_list_sg_add(pdcs, mssg->spu.dst); |
|
|
|
/* Create tx descriptors to submit SPU request */ |
|
err |= pdc_tx_list_sg_add(pdcs, mssg->spu.src); |
|
err |= pdc_tx_list_final(pdcs); /* initiate transfer */ |
|
|
|
if (unlikely(err)) |
|
dev_err(&pdcs->pdev->dev, |
|
"%s failed with error %d", __func__, err); |
|
|
|
return err; |
|
} |
|
|
|
static int pdc_startup(struct mbox_chan *chan) |
|
{ |
|
return pdc_ring_init(chan->con_priv, PDC_RINGSET); |
|
} |
|
|
|
static void pdc_shutdown(struct mbox_chan *chan) |
|
{ |
|
struct pdc_state *pdcs = chan->con_priv; |
|
|
|
if (!pdcs) |
|
return; |
|
|
|
dev_dbg(&pdcs->pdev->dev, |
|
"Shutdown mailbox channel for PDC %u", pdcs->pdc_idx); |
|
pdc_ring_free(pdcs); |
|
} |
|
|
|
/** |
|
* pdc_hw_init() - Use the given initialization parameters to initialize the |
|
* state for one of the PDCs. |
|
* @pdcs: state of the PDC |
|
*/ |
|
static |
|
void pdc_hw_init(struct pdc_state *pdcs) |
|
{ |
|
struct platform_device *pdev; |
|
struct device *dev; |
|
struct dma64 *dma_reg; |
|
int ringset = PDC_RINGSET; |
|
|
|
pdev = pdcs->pdev; |
|
dev = &pdev->dev; |
|
|
|
dev_dbg(dev, "PDC %u initial values:", pdcs->pdc_idx); |
|
dev_dbg(dev, "state structure: %p", |
|
pdcs); |
|
dev_dbg(dev, " - base virtual addr of hw regs %p", |
|
pdcs->pdc_reg_vbase); |
|
|
|
/* initialize data structures */ |
|
pdcs->regs = (struct pdc_regs *)pdcs->pdc_reg_vbase; |
|
pdcs->txregs_64 = (struct dma64_regs *) |
|
(((u8 *)pdcs->pdc_reg_vbase) + |
|
PDC_TXREGS_OFFSET + (sizeof(struct dma64) * ringset)); |
|
pdcs->rxregs_64 = (struct dma64_regs *) |
|
(((u8 *)pdcs->pdc_reg_vbase) + |
|
PDC_RXREGS_OFFSET + (sizeof(struct dma64) * ringset)); |
|
|
|
pdcs->ntxd = PDC_RING_ENTRIES; |
|
pdcs->nrxd = PDC_RING_ENTRIES; |
|
pdcs->ntxpost = PDC_RING_ENTRIES - 1; |
|
pdcs->nrxpost = PDC_RING_ENTRIES - 1; |
|
iowrite32(0, &pdcs->regs->intmask); |
|
|
|
dma_reg = &pdcs->regs->dmaregs[ringset]; |
|
|
|
/* Configure DMA but will enable later in pdc_ring_init() */ |
|
iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control); |
|
|
|
iowrite32(PDC_RX_CTL + (pdcs->rx_status_len << 1), |
|
&dma_reg->dmarcv.control); |
|
|
|
/* Reset current index pointers after making sure DMA is disabled */ |
|
iowrite32(0, &dma_reg->dmaxmt.ptr); |
|
iowrite32(0, &dma_reg->dmarcv.ptr); |
|
|
|
if (pdcs->pdc_resp_hdr_len == PDC_SPU2_RESP_HDR_LEN) |
|
iowrite32(PDC_CKSUM_CTRL, |
|
pdcs->pdc_reg_vbase + PDC_CKSUM_CTRL_OFFSET); |
|
} |
|
|
|
/** |
|
* pdc_hw_disable() - Disable the tx and rx control in the hw. |
|
* @pdcs: PDC state structure |
|
* |
|
*/ |
|
static void pdc_hw_disable(struct pdc_state *pdcs) |
|
{ |
|
struct dma64 *dma_reg; |
|
|
|
dma_reg = &pdcs->regs->dmaregs[PDC_RINGSET]; |
|
iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control); |
|
iowrite32(PDC_RX_CTL + (pdcs->rx_status_len << 1), |
|
&dma_reg->dmarcv.control); |
|
} |
|
|
|
/** |
|
* pdc_rx_buf_pool_create() - Pool of receive buffers used to catch the metadata |
|
* header returned with each response message. |
|
* @pdcs: PDC state structure |
|
* |
|
* The metadata is not returned to the mailbox client. So the PDC driver |
|
* manages these buffers. |
|
* |
|
* Return: PDC_SUCCESS |
|
* -ENOMEM if pool creation fails |
|
*/ |
|
static int pdc_rx_buf_pool_create(struct pdc_state *pdcs) |
|
{ |
|
struct platform_device *pdev; |
|
struct device *dev; |
|
|
|
pdev = pdcs->pdev; |
|
dev = &pdev->dev; |
|
|
|
pdcs->pdc_resp_hdr_len = pdcs->rx_status_len; |
|
if (pdcs->use_bcm_hdr) |
|
pdcs->pdc_resp_hdr_len += BCM_HDR_LEN; |
|
|
|
pdcs->rx_buf_pool = dma_pool_create("pdc rx bufs", dev, |
|
pdcs->pdc_resp_hdr_len, |
|
RX_BUF_ALIGN, 0); |
|
if (!pdcs->rx_buf_pool) |
|
return -ENOMEM; |
|
|
|
return PDC_SUCCESS; |
|
} |
|
|
|
/** |
|
* pdc_interrupts_init() - Initialize the interrupt configuration for a PDC and |
|
* specify a threaded IRQ handler for deferred handling of interrupts outside of |
|
* interrupt context. |
|
* @pdcs: PDC state |
|
* |
|
* Set the interrupt mask for transmit and receive done. |
|
* Set the lazy interrupt frame count to generate an interrupt for just one pkt. |
|
* |
|
* Return: PDC_SUCCESS |
|
* <0 if threaded irq request fails |
|
*/ |
|
static int pdc_interrupts_init(struct pdc_state *pdcs) |
|
{ |
|
struct platform_device *pdev = pdcs->pdev; |
|
struct device *dev = &pdev->dev; |
|
struct device_node *dn = pdev->dev.of_node; |
|
int err; |
|
|
|
/* interrupt configuration */ |
|
iowrite32(PDC_INTMASK, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET); |
|
|
|
if (pdcs->hw_type == FA_HW) |
|
iowrite32(PDC_LAZY_INT, pdcs->pdc_reg_vbase + |
|
FA_RCVLAZY0_OFFSET); |
|
else |
|
iowrite32(PDC_LAZY_INT, pdcs->pdc_reg_vbase + |
|
PDC_RCVLAZY0_OFFSET); |
|
|
|
/* read irq from device tree */ |
|
pdcs->pdc_irq = irq_of_parse_and_map(dn, 0); |
|
dev_dbg(dev, "pdc device %s irq %u for pdcs %p", |
|
dev_name(dev), pdcs->pdc_irq, pdcs); |
|
|
|
err = devm_request_irq(dev, pdcs->pdc_irq, pdc_irq_handler, 0, |
|
dev_name(dev), dev); |
|
if (err) { |
|
dev_err(dev, "IRQ %u request failed with err %d\n", |
|
pdcs->pdc_irq, err); |
|
return err; |
|
} |
|
return PDC_SUCCESS; |
|
} |
|
|
|
static const struct mbox_chan_ops pdc_mbox_chan_ops = { |
|
.send_data = pdc_send_data, |
|
.last_tx_done = pdc_last_tx_done, |
|
.startup = pdc_startup, |
|
.shutdown = pdc_shutdown |
|
}; |
|
|
|
/** |
|
* pdc_mb_init() - Initialize the mailbox controller. |
|
* @pdcs: PDC state |
|
* |
|
* Each PDC is a mailbox controller. Each ringset is a mailbox channel. Kernel |
|
* driver only uses one ringset and thus one mb channel. PDC uses the transmit |
|
* complete interrupt to determine when a mailbox message has successfully been |
|
* transmitted. |
|
* |
|
* Return: 0 on success |
|
* < 0 if there is an allocation or registration failure |
|
*/ |
|
static int pdc_mb_init(struct pdc_state *pdcs) |
|
{ |
|
struct device *dev = &pdcs->pdev->dev; |
|
struct mbox_controller *mbc; |
|
int chan_index; |
|
int err; |
|
|
|
mbc = &pdcs->mbc; |
|
mbc->dev = dev; |
|
mbc->ops = &pdc_mbox_chan_ops; |
|
mbc->num_chans = 1; |
|
mbc->chans = devm_kcalloc(dev, mbc->num_chans, sizeof(*mbc->chans), |
|
GFP_KERNEL); |
|
if (!mbc->chans) |
|
return -ENOMEM; |
|
|
|
mbc->txdone_irq = false; |
|
mbc->txdone_poll = true; |
|
mbc->txpoll_period = 1; |
|
for (chan_index = 0; chan_index < mbc->num_chans; chan_index++) |
|
mbc->chans[chan_index].con_priv = pdcs; |
|
|
|
/* Register mailbox controller */ |
|
err = devm_mbox_controller_register(dev, mbc); |
|
if (err) { |
|
dev_crit(dev, |
|
"Failed to register PDC mailbox controller. Error %d.", |
|
err); |
|
return err; |
|
} |
|
return 0; |
|
} |
|
|
|
/* Device tree API */ |
|
static const int pdc_hw = PDC_HW; |
|
static const int fa_hw = FA_HW; |
|
|
|
static const struct of_device_id pdc_mbox_of_match[] = { |
|
{.compatible = "brcm,iproc-pdc-mbox", .data = &pdc_hw}, |
|
{.compatible = "brcm,iproc-fa2-mbox", .data = &fa_hw}, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, pdc_mbox_of_match); |
|
|
|
/** |
|
* pdc_dt_read() - Read application-specific data from device tree. |
|
* @pdev: Platform device |
|
* @pdcs: PDC state |
|
* |
|
* Reads the number of bytes of receive status that precede each received frame. |
|
* Reads whether transmit and received frames should be preceded by an 8-byte |
|
* BCM header. |
|
* |
|
* Return: 0 if successful |
|
* -ENODEV if device not available |
|
*/ |
|
static int pdc_dt_read(struct platform_device *pdev, struct pdc_state *pdcs) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device_node *dn = pdev->dev.of_node; |
|
const struct of_device_id *match; |
|
const int *hw_type; |
|
int err; |
|
|
|
err = of_property_read_u32(dn, "brcm,rx-status-len", |
|
&pdcs->rx_status_len); |
|
if (err < 0) |
|
dev_err(dev, |
|
"%s failed to get DMA receive status length from device tree", |
|
__func__); |
|
|
|
pdcs->use_bcm_hdr = of_property_read_bool(dn, "brcm,use-bcm-hdr"); |
|
|
|
pdcs->hw_type = PDC_HW; |
|
|
|
match = of_match_device(of_match_ptr(pdc_mbox_of_match), dev); |
|
if (match != NULL) { |
|
hw_type = match->data; |
|
pdcs->hw_type = *hw_type; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* pdc_probe() - Probe function for PDC driver. |
|
* @pdev: PDC platform device |
|
* |
|
* Reserve and map register regions defined in device tree. |
|
* Allocate and initialize tx and rx DMA rings. |
|
* Initialize a mailbox controller for each PDC. |
|
* |
|
* Return: 0 if successful |
|
* < 0 if an error |
|
*/ |
|
static int pdc_probe(struct platform_device *pdev) |
|
{ |
|
int err = 0; |
|
struct device *dev = &pdev->dev; |
|
struct resource *pdc_regs; |
|
struct pdc_state *pdcs; |
|
|
|
/* PDC state for one SPU */ |
|
pdcs = devm_kzalloc(dev, sizeof(*pdcs), GFP_KERNEL); |
|
if (!pdcs) { |
|
err = -ENOMEM; |
|
goto cleanup; |
|
} |
|
|
|
pdcs->pdev = pdev; |
|
platform_set_drvdata(pdev, pdcs); |
|
pdcs->pdc_idx = pdcg.num_spu; |
|
pdcg.num_spu++; |
|
|
|
err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(39)); |
|
if (err) { |
|
dev_warn(dev, "PDC device cannot perform DMA. Error %d.", err); |
|
goto cleanup; |
|
} |
|
|
|
/* Create DMA pool for tx ring */ |
|
pdcs->ring_pool = dma_pool_create("pdc rings", dev, PDC_RING_SIZE, |
|
RING_ALIGN, 0); |
|
if (!pdcs->ring_pool) { |
|
err = -ENOMEM; |
|
goto cleanup; |
|
} |
|
|
|
err = pdc_dt_read(pdev, pdcs); |
|
if (err) |
|
goto cleanup_ring_pool; |
|
|
|
pdc_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
if (!pdc_regs) { |
|
err = -ENODEV; |
|
goto cleanup_ring_pool; |
|
} |
|
dev_dbg(dev, "PDC register region res.start = %pa, res.end = %pa", |
|
&pdc_regs->start, &pdc_regs->end); |
|
|
|
pdcs->pdc_reg_vbase = devm_ioremap_resource(&pdev->dev, pdc_regs); |
|
if (IS_ERR(pdcs->pdc_reg_vbase)) { |
|
err = PTR_ERR(pdcs->pdc_reg_vbase); |
|
dev_err(&pdev->dev, "Failed to map registers: %d\n", err); |
|
goto cleanup_ring_pool; |
|
} |
|
|
|
/* create rx buffer pool after dt read to know how big buffers are */ |
|
err = pdc_rx_buf_pool_create(pdcs); |
|
if (err) |
|
goto cleanup_ring_pool; |
|
|
|
pdc_hw_init(pdcs); |
|
|
|
/* Init tasklet for deferred DMA rx processing */ |
|
tasklet_setup(&pdcs->rx_tasklet, pdc_tasklet_cb); |
|
|
|
err = pdc_interrupts_init(pdcs); |
|
if (err) |
|
goto cleanup_buf_pool; |
|
|
|
/* Initialize mailbox controller */ |
|
err = pdc_mb_init(pdcs); |
|
if (err) |
|
goto cleanup_buf_pool; |
|
|
|
pdc_setup_debugfs(pdcs); |
|
|
|
dev_dbg(dev, "pdc_probe() successful"); |
|
return PDC_SUCCESS; |
|
|
|
cleanup_buf_pool: |
|
tasklet_kill(&pdcs->rx_tasklet); |
|
dma_pool_destroy(pdcs->rx_buf_pool); |
|
|
|
cleanup_ring_pool: |
|
dma_pool_destroy(pdcs->ring_pool); |
|
|
|
cleanup: |
|
return err; |
|
} |
|
|
|
static int pdc_remove(struct platform_device *pdev) |
|
{ |
|
struct pdc_state *pdcs = platform_get_drvdata(pdev); |
|
|
|
pdc_free_debugfs(); |
|
|
|
tasklet_kill(&pdcs->rx_tasklet); |
|
|
|
pdc_hw_disable(pdcs); |
|
|
|
dma_pool_destroy(pdcs->rx_buf_pool); |
|
dma_pool_destroy(pdcs->ring_pool); |
|
return 0; |
|
} |
|
|
|
static struct platform_driver pdc_mbox_driver = { |
|
.probe = pdc_probe, |
|
.remove = pdc_remove, |
|
.driver = { |
|
.name = "brcm-iproc-pdc-mbox", |
|
.of_match_table = of_match_ptr(pdc_mbox_of_match), |
|
}, |
|
}; |
|
module_platform_driver(pdc_mbox_driver); |
|
|
|
MODULE_AUTHOR("Rob Rice <[email protected]>"); |
|
MODULE_DESCRIPTION("Broadcom PDC mailbox driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|