Release 4.11 drivers/mailbox/bcm-pdc-mailbox.c
/*
* Copyright 2016 Broadcom
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation (the "GPL").
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 (GPLv2) for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 (GPLv2) along with this source code.
*/
/*
* Broadcom PDC Mailbox Driver
* The PDC provides a ring based programming interface to one or more hardware
* offload engines. For example, the PDC driver works with both SPU-M and SPU2
* cryptographic offload hardware. In some chips the PDC is referred to as MDE.
*
* The PDC driver registers with the Linux mailbox framework as a mailbox
* controller, once for each PDC instance. Ring 0 for each PDC is registered as
* a mailbox channel. The PDC driver uses interrupts to determine when data
* transfers to and from an offload engine are complete. The PDC driver uses
* threaded IRQs so that response messages are handled outside of interrupt
* context.
*
* The PDC driver allows multiple messages to be pending in the descriptor
* rings. The tx_msg_start descriptor index indicates where the last message
* starts. The txin_numd value at this index indicates how many descriptor
* indexes make up the message. Similar state is kept on the receive side. When
* an rx interrupt indicates a response is ready, the PDC driver processes numd
* descriptors from the tx and rx ring, thus processing one response at a time.
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox/brcm-message.h>
#include <linux/scatterlist.h>
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#define PDC_SUCCESS 0
#define RING_ENTRY_SIZE sizeof(struct dma64dd)
/* # entries in PDC dma ring */
#define PDC_RING_ENTRIES 512
/*
* Minimum number of ring descriptor entries that must be free to tell mailbox
* framework that it can submit another request
*/
#define PDC_RING_SPACE_MIN 15
#define PDC_RING_SIZE (PDC_RING_ENTRIES * RING_ENTRY_SIZE)
/* Rings are 8k aligned */
#define RING_ALIGN_ORDER 13
#define RING_ALIGN BIT(RING_ALIGN_ORDER)
#define RX_BUF_ALIGN_ORDER 5
#define RX_BUF_ALIGN BIT(RX_BUF_ALIGN_ORDER)
/* descriptor bumping macros */
#define XXD(x, max_mask) ((x) & (max_mask))
#define TXD(x, max_mask) XXD((x), (max_mask))
#define RXD(x, max_mask) XXD((x), (max_mask))
#define NEXTTXD(i, max_mask) TXD((i) + 1, (max_mask))
#define PREVTXD(i, max_mask) TXD((i) - 1, (max_mask))
#define NEXTRXD(i, max_mask) RXD((i) + 1, (max_mask))
#define PREVRXD(i, max_mask) RXD((i) - 1, (max_mask))
#define NTXDACTIVE(h, t, max_mask) TXD((t) - (h), (max_mask))
#define NRXDACTIVE(h, t, max_mask) RXD((t) - (h), (max_mask))
/* Length of BCM header at start of SPU msg, in bytes */
#define BCM_HDR_LEN 8
/*
* PDC driver reserves ringset 0 on each SPU for its own use. The driver does
* not currently support use of multiple ringsets on a single PDC engine.
*/
#define PDC_RINGSET 0
/*
* Interrupt mask and status definitions. Enable interrupts for tx and rx on
* ring 0
*/
#define PDC_RCVINT_0 (16 + PDC_RINGSET)
#define PDC_RCVINTEN_0 BIT(PDC_RCVINT_0)
#define PDC_INTMASK (PDC_RCVINTEN_0)
#define PDC_LAZY_FRAMECOUNT 1
#define PDC_LAZY_TIMEOUT 10000
#define PDC_LAZY_INT (PDC_LAZY_TIMEOUT | (PDC_LAZY_FRAMECOUNT << 24))
#define PDC_INTMASK_OFFSET 0x24
#define PDC_INTSTATUS_OFFSET 0x20
#define PDC_RCVLAZY0_OFFSET (0x30 + 4 * PDC_RINGSET)
/*
* For SPU2, configure MDE_CKSUM_CONTROL to write 17 bytes of metadata
* before frame
*/
#define PDC_SPU2_RESP_HDR_LEN 17
#define PDC_CKSUM_CTRL BIT(27)
#define PDC_CKSUM_CTRL_OFFSET 0x400
#define PDC_SPUM_RESP_HDR_LEN 32
/*
* Sets the following bits for write to transmit control reg:
* 11 - PtyChkDisable - parity check is disabled
* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory
*/
#define PDC_TX_CTL 0x000C0800
/* Bit in tx control reg to enable tx channel */
#define PDC_TX_ENABLE 0x1
/*
* Sets the following bits for write to receive control reg:
* 7:1 - RcvOffset - size in bytes of status region at start of rx frame buf
* 9 - SepRxHdrDescEn - place start of new frames only in descriptors
* that have StartOfFrame set
* 10 - OflowContinue - on rx FIFO overflow, clear rx fifo, discard all
* remaining bytes in current frame, report error
* in rx frame status for current frame
* 11 - PtyChkDisable - parity check is disabled
* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory
*/
#define PDC_RX_CTL 0x000C0E00
/* Bit in rx control reg to enable rx channel */
#define PDC_RX_ENABLE 0x1
#define CRYPTO_D64_RS0_CD_MASK ((PDC_RING_ENTRIES * RING_ENTRY_SIZE) - 1)
/* descriptor flags */
#define D64_CTRL1_EOT BIT(28)
/* end of descriptor table */
#define D64_CTRL1_IOC BIT(29)
/* interrupt on complete */
#define D64_CTRL1_EOF BIT(30)
/* end of frame */
#define D64_CTRL1_SOF BIT(31)
/* start of frame */
#define RX_STATUS_OVERFLOW 0x00800000
#define RX_STATUS_LEN 0x0000FFFF
#define PDC_TXREGS_OFFSET 0x200
#define PDC_RXREGS_OFFSET 0x220
/* Maximum size buffer the DMA engine can handle */
#define PDC_DMA_BUF_MAX 16384
struct pdc_dma_map {
void *ctx; /* opaque context associated with frame */
};
/* dma descriptor */
struct dma64dd {
u32 ctrl1; /* misc control bits */
u32 ctrl2; /* buffer count and address extension */
u32 addrlow; /* memory address of the date buffer, bits 31:0 */
u32 addrhigh; /* memory address of the date buffer, bits 63:32 */
};
/* dma registers per channel(xmt or rcv) */
struct dma64_regs {
u32 control; /* enable, et al */
u32 ptr; /* last descriptor posted to chip */
u32 addrlow; /* descriptor ring base address low 32-bits */
u32 addrhigh; /* descriptor ring base address bits 63:32 */
u32 status0; /* last rx descriptor written by hw */
u32 status1; /* driver does not use */
};
/* cpp contortions to concatenate w/arg prescan */
#ifndef PAD
#define _PADLINE(line) pad ## line
#define _XSTR(line) _PADLINE(line)
#define PAD _XSTR(__LINE__)
#endif /* PAD */
/* dma registers. matches hw layout. */
struct dma64 {
struct dma64_regs dmaxmt; /* dma tx */
u32 PAD[2];
struct dma64_regs dmarcv; /* dma rx */
u32 PAD[2];
};
/* PDC registers */
struct pdc_regs {
u32 devcontrol; /* 0x000 */
u32 devstatus; /* 0x004 */
u32 PAD;
u32 biststatus; /* 0x00c */
u32 PAD[4];
u32 intstatus; /* 0x020 */
u32 intmask; /* 0x024 */
u32 gptimer; /* 0x028 */
u32 PAD;
u32 intrcvlazy_0; /* 0x030 */
u32 intrcvlazy_1; /* 0x034 */
u32 intrcvlazy_2; /* 0x038 */
u32 intrcvlazy_3; /* 0x03c */
u32 PAD[48];
u32 removed_intrecvlazy; /* 0x100 */
u32 flowctlthresh; /* 0x104 */
u32 wrrthresh; /* 0x108 */
u32 gmac_idle_cnt_thresh; /* 0x10c */
u32 PAD[4];
u32 ifioaccessaddr; /* 0x120 */
u32 ifioaccessbyte; /* 0x124 */
u32 ifioaccessdata; /* 0x128 */
u32 PAD[21];
u32 phyaccess; /* 0x180 */
u32 PAD;
u32 phycontrol; /* 0x188 */
u32 txqctl; /* 0x18c */
u32 rxqctl; /* 0x190 */
u32 gpioselect; /* 0x194 */
u32 gpio_output_en; /* 0x198 */
u32 PAD; /* 0x19c */
u32 txq_rxq_mem_ctl; /* 0x1a0 */
u32 memory_ecc_status; /* 0x1a4 */
u32 serdes_ctl; /* 0x1a8 */
u32 serdes_status0; /* 0x1ac */
u32 serdes_status1; /* 0x1b0 */
u32 PAD[11]; /* 0x1b4-1dc */
u32 clk_ctl_st; /* 0x1e0 */
u32 hw_war; /* 0x1e4 */
u32 pwrctl; /* 0x1e8 */
u32 PAD[5];
#define PDC_NUM_DMA_RINGS 4
struct dma64 dmaregs[PDC_NUM_DMA_RINGS]; /* 0x0200 - 0x2fc */
/* more registers follow, but we don't use them */
};
/* structure for allocating/freeing DMA rings */
struct pdc_ring_alloc {
dma_addr_t dmabase; /* DMA address of start of ring */
void *vbase; /* base kernel virtual address of ring */
u32 size; /* ring allocation size in bytes */
};
/*
* context associated with a receive descriptor.
* @rxp_ctx: opaque context associated with frame that starts at each
* rx ring index.
* @dst_sg: Scatterlist used to form reply frames beginning at a given ring
* index. Retained in order to unmap each sg after reply is processed.
* @rxin_numd: Number of rx descriptors associated with the message that starts
* at a descriptor index. Not set for every index. For example,
* if descriptor index i points to a scatterlist with 4 entries,
* then the next three descriptor indexes don't have a value set.
* @resp_hdr: Virtual address of buffer used to catch DMA rx status
* @resp_hdr_daddr: physical address of DMA rx status buffer
*/
struct pdc_rx_ctx {
void *rxp_ctx;
struct scatterlist *dst_sg;
u32 rxin_numd;
void *resp_hdr;
dma_addr_t resp_hdr_daddr;
};
/* PDC state structure */
struct pdc_state {
/* Index of the PDC whose state is in this structure instance */
u8 pdc_idx;
/* Platform device for this PDC instance */
struct platform_device *pdev;
/*
* Each PDC instance has a mailbox controller. PDC receives request
* messages through mailboxes, and sends response messages through the
* mailbox framework.
*/
struct mbox_controller mbc;
unsigned int pdc_irq;
/* tasklet for deferred processing after DMA rx interrupt */
struct tasklet_struct rx_tasklet;
/* Number of bytes of receive status prior to each rx frame */
u32 rx_status_len;
/* Whether a BCM header is prepended to each frame */
bool use_bcm_hdr;
/* Sum of length of BCM header and rx status header */
u32 pdc_resp_hdr_len;
/* The base virtual address of DMA hw registers */
void __iomem *pdc_reg_vbase;
/* Pool for allocation of DMA rings */
struct dma_pool *ring_pool;
/* Pool for allocation of metadata buffers for response messages */
struct dma_pool *rx_buf_pool;
/*
* The base virtual address of DMA tx/rx descriptor rings. Corresponding
* DMA address and size of ring allocation.
*/
struct pdc_ring_alloc tx_ring_alloc;
struct pdc_ring_alloc rx_ring_alloc;
struct pdc_regs *regs; /* start of PDC registers */
struct dma64_regs *txregs_64; /* dma tx engine registers */
struct dma64_regs *rxregs_64; /* dma rx engine registers */
/*
* Arrays of PDC_RING_ENTRIES descriptors
* To use multiple ringsets, this needs to be extended
*/
struct dma64dd *txd_64; /* tx descriptor ring */
struct dma64dd *rxd_64; /* rx descriptor ring */
/* descriptor ring sizes */
u32 ntxd; /* # tx descriptors */
u32 nrxd; /* # rx descriptors */
u32 nrxpost; /* # rx buffers to keep posted */
u32 ntxpost; /* max number of tx buffers that can be posted */
/*
* Index of next tx descriptor to reclaim. That is, the descriptor
* index of the oldest tx buffer for which the host has yet to process
* the corresponding response.
*/
u32 txin;
/*
* Index of the first receive descriptor for the sequence of
* message fragments currently under construction. Used to build up
* the rxin_numd count for a message. Updated to rxout when the host
* starts a new sequence of rx buffers for a new message.
*/
u32 tx_msg_start;
/* Index of next tx descriptor to post. */
u32 txout;
/*
* Number of tx descriptors associated with the message that starts
* at this tx descriptor index.
*/
u32 txin_numd[PDC_RING_ENTRIES];
/*
* Index of next rx descriptor to reclaim. This is the index of
* the next descriptor whose data has yet to be processed by the host.
*/
u32 rxin;
/*
* Index of the first receive descriptor for the sequence of
* message fragments currently under construction. Used to build up
* the rxin_numd count for a message. Updated to rxout when the host
* starts a new sequence of rx buffers for a new message.
*/
u32 rx_msg_start;
/*
* Saved value of current hardware rx descriptor index.
* The last rx buffer written by the hw is the index previous to
* this one.
*/
u32 last_rx_curr;
/* Index of next rx descriptor to post. */
u32 rxout;
struct pdc_rx_ctx rx_ctx[PDC_RING_ENTRIES];
/*
* Scatterlists used to form request and reply frames beginning at a
* given ring index. Retained in order to unmap each sg after reply
* is processed
*/
struct scatterlist *src_sg[PDC_RING_ENTRIES];
struct dentry *debugfs_stats; /* debug FS stats file for this PDC */
/* counters */
u32 pdc_requests; /* number of request messages submitted */
u32 pdc_replies; /* number of reply messages received */
u32 last_tx_not_done; /* too few tx descriptors to indicate done */
u32 tx_ring_full; /* unable to accept msg because tx ring full */
u32 rx_ring_full; /* unable to accept msg because rx ring full */
u32 txnobuf; /* unable to create tx descriptor */
u32 rxnobuf; /* unable to create rx descriptor */
u32 rx_oflow; /* count of rx overflows */
};
/* Global variables */
struct pdc_globals {
/* Actual number of SPUs in hardware, as reported by device tree */
u32 num_spu;
};
static struct pdc_globals pdcg;
/* top level debug FS directory for PDC driver */
static struct dentry *debugfs_dir;
static ssize_t pdc_debugfs_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *offp)
{
struct pdc_state *pdcs;
char *buf;
ssize_t ret, out_offset, out_count;
out_count = 512;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pdcs = filp->private_data;
out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"SPU %u stats:\n", pdcs->pdc_idx);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"PDC requests....................%u\n",
pdcs->pdc_requests);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"PDC responses...................%u\n",
pdcs->pdc_replies);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Tx not done.....................%u\n",
pdcs->last_tx_not_done);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Tx ring full....................%u\n",
pdcs->tx_ring_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Rx ring full....................%u\n",
pdcs->rx_ring_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Tx desc write fail. Ring full...%u\n",
pdcs->txnobuf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Rx desc write fail. Ring full...%u\n",
pdcs->rxnobuf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Receive overflow................%u\n",
pdcs->rx_oflow);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"Num frags in rx ring............%u\n",
NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr,
pdcs->nrxpost));
if (out_offset > out_count)
out_offset = out_count;
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
kfree(buf);
return ret;
}
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static const struct file_operations pdc_debugfs_stats = {
.owner = THIS_MODULE,
.open = simple_open,
.read = pdc_debugfs_read,
};
/**
* pdc_setup_debugfs() - Create the debug FS directories. If the top-level
* directory has not yet been created, create it now. Create a stats file in
* this directory for a SPU.
* @pdcs: PDC state structure
*/
static void pdc_setup_debugfs(struct pdc_state *pdcs)
{
char spu_stats_name[16];
if (!debugfs_initialized())
return;
snprintf(spu_stats_name, 16, "pdc%d_stats", pdcs->pdc_idx);
if (!debugfs_dir)
debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
/* S_IRUSR == 0400 */
pdcs->debugfs_stats = debugfs_create_file(spu_stats_name, 0400,
debugfs_dir, pdcs,
&pdc_debugfs_stats);
}
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static void pdc_free_debugfs(void)
{
debugfs_remove_recursive(debugfs_dir);
debugfs_dir = NULL;
}
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/**
* pdc_build_rxd() - Build DMA descriptor to receive SPU result.
* @pdcs: PDC state for SPU that will generate result
* @dma_addr: DMA address of buffer that descriptor is being built for
* @buf_len: Length of the receive buffer, in bytes
* @flags: Flags to be stored in descriptor
*/
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);
}
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/**
* 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);
}
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/**
* 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;
}
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/**
* 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(&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;
}
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/**
* 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;
}
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/**
* 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;
}
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/**
* 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;
}
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/**
* 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;
}
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/**
* 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;
}
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/**
* pdc_tasklet_cb() - Tasklet callback that runs the deferred processing after
* a DMA receive interrupt. Reenables the receive interrupt.
* @data: PDC state structure
*/