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linux_dsm_epyc7002/drivers/rapidio/devices/tsi721.c
Alexandre Bounine 9eaa3d9bb2 rapidio/tsi721: add DMA engine support 
Adds support for DMA Engine API into Tsi721 mport driver.

Includes following changes for Tsi721 driver:
- Modifies BDMA register offset definitions to support per-channel handling
- Separates BDMA channel reserved for RIO Maintenance requests
- Adds DMA Engine callback routines

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31 17:49:31 -07:00

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/*
* RapidIO mport driver for Tsi721 PCIExpress-to-SRIO bridge
*
* Copyright 2011 Integrated Device Technology, Inc.
* Alexandre Bounine <alexandre.bounine@idt.com>
* Chul Kim <chul.kim@idt.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* 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 for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/kfifo.h>
#include <linux/delay.h>
#include "tsi721.h"
#define DEBUG_PW /* Inbound Port-Write debugging */
static void tsi721_omsg_handler(struct tsi721_device *priv, int ch);
static void tsi721_imsg_handler(struct tsi721_device *priv, int ch);
/**
* tsi721_lcread - read from local SREP config space
* @mport: RapidIO master port info
* @index: ID of RapdiIO interface
* @offset: Offset into configuration space
* @len: Length (in bytes) of the maintenance transaction
* @data: Value to be read into
*
* Generates a local SREP space read. Returns %0 on
* success or %-EINVAL on failure.
*/
static int tsi721_lcread(struct rio_mport *mport, int index, u32 offset,
int len, u32 *data)
{
struct tsi721_device *priv = mport->priv;
if (len != sizeof(u32))
return -EINVAL; /* only 32-bit access is supported */
*data = ioread32(priv->regs + offset);
return 0;
}
/**
* tsi721_lcwrite - write into local SREP config space
* @mport: RapidIO master port info
* @index: ID of RapdiIO interface
* @offset: Offset into configuration space
* @len: Length (in bytes) of the maintenance transaction
* @data: Value to be written
*
* Generates a local write into SREP configuration space. Returns %0 on
* success or %-EINVAL on failure.
*/
static int tsi721_lcwrite(struct rio_mport *mport, int index, u32 offset,
int len, u32 data)
{
struct tsi721_device *priv = mport->priv;
if (len != sizeof(u32))
return -EINVAL; /* only 32-bit access is supported */
iowrite32(data, priv->regs + offset);
return 0;
}
/**
* tsi721_maint_dma - Helper function to generate RapidIO maintenance
* transactions using designated Tsi721 DMA channel.
* @priv: pointer to tsi721 private data
* @sys_size: RapdiIO transport system size
* @destid: Destination ID of transaction
* @hopcount: Number of hops to target device
* @offset: Offset into configuration space
* @len: Length (in bytes) of the maintenance transaction
* @data: Location to be read from or write into
* @do_wr: Operation flag (1 == MAINT_WR)
*
* Generates a RapidIO maintenance transaction (Read or Write).
* Returns %0 on success and %-EINVAL or %-EFAULT on failure.
*/
static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
u16 destid, u8 hopcount, u32 offset, int len,
u32 *data, int do_wr)
{
void __iomem *regs = priv->regs + TSI721_DMAC_BASE(priv->mdma.ch_id);
struct tsi721_dma_desc *bd_ptr;
u32 rd_count, swr_ptr, ch_stat;
int i, err = 0;
u32 op = do_wr ? MAINT_WR : MAINT_RD;
if (offset > (RIO_MAINT_SPACE_SZ - len) || (len != sizeof(u32)))
return -EINVAL;
bd_ptr = priv->mdma.bd_base;
rd_count = ioread32(regs + TSI721_DMAC_DRDCNT);
/* Initialize DMA descriptor */
bd_ptr[0].type_id = cpu_to_le32((DTYPE2 << 29) | (op << 19) | destid);
bd_ptr[0].bcount = cpu_to_le32((sys_size << 26) | 0x04);
bd_ptr[0].raddr_lo = cpu_to_le32((hopcount << 24) | offset);
bd_ptr[0].raddr_hi = 0;
if (do_wr)
bd_ptr[0].data[0] = cpu_to_be32p(data);
else
bd_ptr[0].data[0] = 0xffffffff;
mb();
/* Start DMA operation */
iowrite32(rd_count + 2, regs + TSI721_DMAC_DWRCNT);
ioread32(regs + TSI721_DMAC_DWRCNT);
i = 0;
/* Wait until DMA transfer is finished */
while ((ch_stat = ioread32(regs + TSI721_DMAC_STS))
& TSI721_DMAC_STS_RUN) {
udelay(1);
if (++i >= 5000000) {
dev_dbg(&priv->pdev->dev,
"%s : DMA[%d] read timeout ch_status=%x\n",
__func__, priv->mdma.ch_id, ch_stat);
if (!do_wr)
*data = 0xffffffff;
err = -EIO;
goto err_out;
}
}
if (ch_stat & TSI721_DMAC_STS_ABORT) {
/* If DMA operation aborted due to error,
* reinitialize DMA channel
*/
dev_dbg(&priv->pdev->dev, "%s : DMA ABORT ch_stat=%x\n",
__func__, ch_stat);
dev_dbg(&priv->pdev->dev, "OP=%d : destid=%x hc=%x off=%x\n",
do_wr ? MAINT_WR : MAINT_RD, destid, hopcount, offset);
iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
udelay(10);
iowrite32(0, regs + TSI721_DMAC_DWRCNT);
udelay(1);
if (!do_wr)
*data = 0xffffffff;
err = -EIO;
goto err_out;
}
if (!do_wr)
*data = be32_to_cpu(bd_ptr[0].data[0]);
/*
* Update descriptor status FIFO RD pointer.
* NOTE: Skipping check and clear FIFO entries because we are waiting
* for transfer to be completed.
*/
swr_ptr = ioread32(regs + TSI721_DMAC_DSWP);
iowrite32(swr_ptr, regs + TSI721_DMAC_DSRP);
err_out:
return err;
}
/**
* tsi721_cread_dma - Generate a RapidIO maintenance read transaction
* using Tsi721 BDMA engine.
* @mport: RapidIO master port control structure
* @index: ID of RapdiIO interface
* @destid: Destination ID of transaction
* @hopcount: Number of hops to target device
* @offset: Offset into configuration space
* @len: Length (in bytes) of the maintenance transaction
* @val: Location to be read into
*
* Generates a RapidIO maintenance read transaction.
* Returns %0 on success and %-EINVAL or %-EFAULT on failure.
*/
static int tsi721_cread_dma(struct rio_mport *mport, int index, u16 destid,
u8 hopcount, u32 offset, int len, u32 *data)
{
struct tsi721_device *priv = mport->priv;
return tsi721_maint_dma(priv, mport->sys_size, destid, hopcount,
offset, len, data, 0);
}
/**
* tsi721_cwrite_dma - Generate a RapidIO maintenance write transaction
* using Tsi721 BDMA engine
* @mport: RapidIO master port control structure
* @index: ID of RapdiIO interface
* @destid: Destination ID of transaction
* @hopcount: Number of hops to target device
* @offset: Offset into configuration space
* @len: Length (in bytes) of the maintenance transaction
* @val: Value to be written
*
* Generates a RapidIO maintenance write transaction.
* Returns %0 on success and %-EINVAL or %-EFAULT on failure.
*/
static int tsi721_cwrite_dma(struct rio_mport *mport, int index, u16 destid,
u8 hopcount, u32 offset, int len, u32 data)
{
struct tsi721_device *priv = mport->priv;
u32 temp = data;
return tsi721_maint_dma(priv, mport->sys_size, destid, hopcount,
offset, len, &temp, 1);
}
/**
* tsi721_pw_handler - Tsi721 inbound port-write interrupt handler
* @mport: RapidIO master port structure
*
* Handles inbound port-write interrupts. Copies PW message from an internal
* buffer into PW message FIFO and schedules deferred routine to process
* queued messages.
*/
static int
tsi721_pw_handler(struct rio_mport *mport)
{
struct tsi721_device *priv = mport->priv;
u32 pw_stat;
u32 pw_buf[TSI721_RIO_PW_MSG_SIZE/sizeof(u32)];
pw_stat = ioread32(priv->regs + TSI721_RIO_PW_RX_STAT);
if (pw_stat & TSI721_RIO_PW_RX_STAT_PW_VAL) {
pw_buf[0] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(0));
pw_buf[1] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(1));
pw_buf[2] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(2));
pw_buf[3] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(3));
/* Queue PW message (if there is room in FIFO),
* otherwise discard it.
*/
spin_lock(&priv->pw_fifo_lock);
if (kfifo_avail(&priv->pw_fifo) >= TSI721_RIO_PW_MSG_SIZE)
kfifo_in(&priv->pw_fifo, pw_buf,
TSI721_RIO_PW_MSG_SIZE);
else
priv->pw_discard_count++;
spin_unlock(&priv->pw_fifo_lock);
}
/* Clear pending PW interrupts */
iowrite32(TSI721_RIO_PW_RX_STAT_PW_DISC | TSI721_RIO_PW_RX_STAT_PW_VAL,
priv->regs + TSI721_RIO_PW_RX_STAT);
schedule_work(&priv->pw_work);
return 0;
}
static void tsi721_pw_dpc(struct work_struct *work)
{
struct tsi721_device *priv = container_of(work, struct tsi721_device,
pw_work);
u32 msg_buffer[RIO_PW_MSG_SIZE/sizeof(u32)]; /* Use full size PW message
buffer for RIO layer */
/*
* Process port-write messages
*/
while (kfifo_out_spinlocked(&priv->pw_fifo, (unsigned char *)msg_buffer,
TSI721_RIO_PW_MSG_SIZE, &priv->pw_fifo_lock)) {
/* Process one message */
#ifdef DEBUG_PW
{
u32 i;
pr_debug("%s : Port-Write Message:", __func__);
for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32); ) {
pr_debug("0x%02x: %08x %08x %08x %08x", i*4,
msg_buffer[i], msg_buffer[i + 1],
msg_buffer[i + 2], msg_buffer[i + 3]);
i += 4;
}
pr_debug("\n");
}
#endif
/* Pass the port-write message to RIO core for processing */
rio_inb_pwrite_handler((union rio_pw_msg *)msg_buffer);
}
}
/**
* tsi721_pw_enable - enable/disable port-write interface init
* @mport: Master port implementing the port write unit
* @enable: 1=enable; 0=disable port-write message handling
*/
static int tsi721_pw_enable(struct rio_mport *mport, int enable)
{
struct tsi721_device *priv = mport->priv;
u32 rval;
rval = ioread32(priv->regs + TSI721_RIO_EM_INT_ENABLE);
if (enable)
rval |= TSI721_RIO_EM_INT_ENABLE_PW_RX;
else
rval &= ~TSI721_RIO_EM_INT_ENABLE_PW_RX;
/* Clear pending PW interrupts */
iowrite32(TSI721_RIO_PW_RX_STAT_PW_DISC | TSI721_RIO_PW_RX_STAT_PW_VAL,
priv->regs + TSI721_RIO_PW_RX_STAT);
/* Update enable bits */
iowrite32(rval, priv->regs + TSI721_RIO_EM_INT_ENABLE);
return 0;
}
/**
* tsi721_dsend - Send a RapidIO doorbell
* @mport: RapidIO master port info
* @index: ID of RapidIO interface
* @destid: Destination ID of target device
* @data: 16-bit info field of RapidIO doorbell
*
* Sends a RapidIO doorbell message. Always returns %0.
*/
static int tsi721_dsend(struct rio_mport *mport, int index,
u16 destid, u16 data)
{
struct tsi721_device *priv = mport->priv;
u32 offset;
offset = (((mport->sys_size) ? RIO_TT_CODE_16 : RIO_TT_CODE_8) << 18) |
(destid << 2);
dev_dbg(&priv->pdev->dev,
"Send Doorbell 0x%04x to destID 0x%x\n", data, destid);
iowrite16be(data, priv->odb_base + offset);
return 0;
}
/**
* tsi721_dbell_handler - Tsi721 doorbell interrupt handler
* @mport: RapidIO master port structure
*
* Handles inbound doorbell interrupts. Copies doorbell entry from an internal
* buffer into DB message FIFO and schedules deferred routine to process
* queued DBs.
*/
static int
tsi721_dbell_handler(struct rio_mport *mport)
{
struct tsi721_device *priv = mport->priv;
u32 regval;
/* Disable IDB interrupts */
regval = ioread32(priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
regval &= ~TSI721_SR_CHINT_IDBQRCV;
iowrite32(regval,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
schedule_work(&priv->idb_work);
return 0;
}
static void tsi721_db_dpc(struct work_struct *work)
{
struct tsi721_device *priv = container_of(work, struct tsi721_device,
idb_work);
struct rio_mport *mport;
struct rio_dbell *dbell;
int found = 0;
u32 wr_ptr, rd_ptr;
u64 *idb_entry;
u32 regval;
union {
u64 msg;
u8 bytes[8];
} idb;
/*
* Process queued inbound doorbells
*/
mport = priv->mport;
wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
rd_ptr = ioread32(priv->regs + TSI721_IDQ_RP(IDB_QUEUE)) % IDB_QSIZE;
while (wr_ptr != rd_ptr) {
idb_entry = (u64 *)(priv->idb_base +
(TSI721_IDB_ENTRY_SIZE * rd_ptr));
rd_ptr++;
rd_ptr %= IDB_QSIZE;
idb.msg = *idb_entry;
*idb_entry = 0;
/* Process one doorbell */
list_for_each_entry(dbell, &mport->dbells, node) {
if ((dbell->res->start <= DBELL_INF(idb.bytes)) &&
(dbell->res->end >= DBELL_INF(idb.bytes))) {
found = 1;
break;
}
}
if (found) {
dbell->dinb(mport, dbell->dev_id, DBELL_SID(idb.bytes),
DBELL_TID(idb.bytes), DBELL_INF(idb.bytes));
} else {
dev_dbg(&priv->pdev->dev,
"spurious inb doorbell, sid %2.2x tid %2.2x"
" info %4.4x\n", DBELL_SID(idb.bytes),
DBELL_TID(idb.bytes), DBELL_INF(idb.bytes));
}
}
iowrite32(rd_ptr & (IDB_QSIZE - 1),
priv->regs + TSI721_IDQ_RP(IDB_QUEUE));
/* Re-enable IDB interrupts */
regval = ioread32(priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
regval |= TSI721_SR_CHINT_IDBQRCV;
iowrite32(regval,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
}
/**
* tsi721_irqhandler - Tsi721 interrupt handler
* @irq: Linux interrupt number
* @ptr: Pointer to interrupt-specific data (mport structure)
*
* Handles Tsi721 interrupts signaled using MSI and INTA. Checks reported
* interrupt events and calls an event-specific handler(s).
*/
static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
{
struct rio_mport *mport = (struct rio_mport *)ptr;
struct tsi721_device *priv = mport->priv;
u32 dev_int;
u32 dev_ch_int;
u32 intval;
u32 ch_inte;
dev_int = ioread32(priv->regs + TSI721_DEV_INT);
if (!dev_int)
return IRQ_NONE;
dev_ch_int = ioread32(priv->regs + TSI721_DEV_CHAN_INT);
if (dev_int & TSI721_DEV_INT_SR2PC_CH) {
/* Service SR2PC Channel interrupts */
if (dev_ch_int & TSI721_INT_SR2PC_CHAN(IDB_QUEUE)) {
/* Service Inbound Doorbell interrupt */
intval = ioread32(priv->regs +
TSI721_SR_CHINT(IDB_QUEUE));
if (intval & TSI721_SR_CHINT_IDBQRCV)
tsi721_dbell_handler(mport);
else
dev_info(&priv->pdev->dev,
"Unsupported SR_CH_INT %x\n", intval);
/* Clear interrupts */
iowrite32(intval,
priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
}
}
if (dev_int & TSI721_DEV_INT_SMSG_CH) {
int ch;
/*
* Service channel interrupts from Messaging Engine
*/
if (dev_ch_int & TSI721_INT_IMSG_CHAN_M) { /* Inbound Msg */
/* Disable signaled OB MSG Channel interrupts */
ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
ch_inte &= ~(dev_ch_int & TSI721_INT_IMSG_CHAN_M);
iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
/*
* Process Inbound Message interrupt for each MBOX
*/
for (ch = 4; ch < RIO_MAX_MBOX + 4; ch++) {
if (!(dev_ch_int & TSI721_INT_IMSG_CHAN(ch)))
continue;
tsi721_imsg_handler(priv, ch);
}
}
if (dev_ch_int & TSI721_INT_OMSG_CHAN_M) { /* Outbound Msg */
/* Disable signaled OB MSG Channel interrupts */
ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
ch_inte &= ~(dev_ch_int & TSI721_INT_OMSG_CHAN_M);
iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
/*
* Process Outbound Message interrupts for each MBOX
*/
for (ch = 0; ch < RIO_MAX_MBOX; ch++) {
if (!(dev_ch_int & TSI721_INT_OMSG_CHAN(ch)))
continue;
tsi721_omsg_handler(priv, ch);
}
}
}
if (dev_int & TSI721_DEV_INT_SRIO) {
/* Service SRIO MAC interrupts */
intval = ioread32(priv->regs + TSI721_RIO_EM_INT_STAT);
if (intval & TSI721_RIO_EM_INT_STAT_PW_RX)
tsi721_pw_handler(mport);
}
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
if (dev_int & TSI721_DEV_INT_BDMA_CH) {
int ch;
if (dev_ch_int & TSI721_INT_BDMA_CHAN_M) {
dev_dbg(&priv->pdev->dev,
"IRQ from DMA channel 0x%08x\n", dev_ch_int);
for (ch = 0; ch < TSI721_DMA_MAXCH; ch++) {
if (!(dev_ch_int & TSI721_INT_BDMA_CHAN(ch)))
continue;
tsi721_bdma_handler(&priv->bdma[ch]);
}
}
}
#endif
return IRQ_HANDLED;
}
static void tsi721_interrupts_init(struct tsi721_device *priv)
{
u32 intr;
/* Enable IDB interrupts */
iowrite32(TSI721_SR_CHINT_ALL,
priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
iowrite32(TSI721_SR_CHINT_IDBQRCV,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
/* Enable SRIO MAC interrupts */
iowrite32(TSI721_RIO_EM_DEV_INT_EN_INT,
priv->regs + TSI721_RIO_EM_DEV_INT_EN);
/* Enable interrupts from channels in use */
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE) |
(TSI721_INT_BDMA_CHAN_M &
~TSI721_INT_BDMA_CHAN(TSI721_DMACH_MAINT));
#else
intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE);
#endif
iowrite32(intr, priv->regs + TSI721_DEV_CHAN_INTE);
if (priv->flags & TSI721_USING_MSIX)
intr = TSI721_DEV_INT_SRIO;
else
intr = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;
iowrite32(intr, priv->regs + TSI721_DEV_INTE);
ioread32(priv->regs + TSI721_DEV_INTE);
}
#ifdef CONFIG_PCI_MSI
/**
* tsi721_omsg_msix - MSI-X interrupt handler for outbound messaging
* @irq: Linux interrupt number
* @ptr: Pointer to interrupt-specific data (mport structure)
*
* Handles outbound messaging interrupts signaled using MSI-X.
*/
static irqreturn_t tsi721_omsg_msix(int irq, void *ptr)
{
struct tsi721_device *priv = ((struct rio_mport *)ptr)->priv;
int mbox;
mbox = (irq - priv->msix[TSI721_VECT_OMB0_DONE].vector) % RIO_MAX_MBOX;
tsi721_omsg_handler(priv, mbox);
return IRQ_HANDLED;
}
/**
* tsi721_imsg_msix - MSI-X interrupt handler for inbound messaging
* @irq: Linux interrupt number
* @ptr: Pointer to interrupt-specific data (mport structure)
*
* Handles inbound messaging interrupts signaled using MSI-X.
*/
static irqreturn_t tsi721_imsg_msix(int irq, void *ptr)
{
struct tsi721_device *priv = ((struct rio_mport *)ptr)->priv;
int mbox;
mbox = (irq - priv->msix[TSI721_VECT_IMB0_RCV].vector) % RIO_MAX_MBOX;
tsi721_imsg_handler(priv, mbox + 4);
return IRQ_HANDLED;
}
/**
* tsi721_srio_msix - Tsi721 MSI-X SRIO MAC interrupt handler
* @irq: Linux interrupt number
* @ptr: Pointer to interrupt-specific data (mport structure)
*
* Handles Tsi721 interrupts from SRIO MAC.
*/
static irqreturn_t tsi721_srio_msix(int irq, void *ptr)
{
struct tsi721_device *priv = ((struct rio_mport *)ptr)->priv;
u32 srio_int;
/* Service SRIO MAC interrupts */
srio_int = ioread32(priv->regs + TSI721_RIO_EM_INT_STAT);
if (srio_int & TSI721_RIO_EM_INT_STAT_PW_RX)
tsi721_pw_handler((struct rio_mport *)ptr);
return IRQ_HANDLED;
}
/**
* tsi721_sr2pc_ch_msix - Tsi721 MSI-X SR2PC Channel interrupt handler
* @irq: Linux interrupt number
* @ptr: Pointer to interrupt-specific data (mport structure)
*
* Handles Tsi721 interrupts from SR2PC Channel.
* NOTE: At this moment services only one SR2PC channel associated with inbound
* doorbells.
*/
static irqreturn_t tsi721_sr2pc_ch_msix(int irq, void *ptr)
{
struct tsi721_device *priv = ((struct rio_mport *)ptr)->priv;
u32 sr_ch_int;
/* Service Inbound DB interrupt from SR2PC channel */
sr_ch_int = ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
if (sr_ch_int & TSI721_SR_CHINT_IDBQRCV)
tsi721_dbell_handler((struct rio_mport *)ptr);
/* Clear interrupts */
iowrite32(sr_ch_int, priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
/* Read back to ensure that interrupt was cleared */
sr_ch_int = ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
return IRQ_HANDLED;
}
/**
* tsi721_request_msix - register interrupt service for MSI-X mode.
* @mport: RapidIO master port structure
*
* Registers MSI-X interrupt service routines for interrupts that are active
* immediately after mport initialization. Messaging interrupt service routines
* should be registered during corresponding open requests.
*/
static int tsi721_request_msix(struct rio_mport *mport)
{
struct tsi721_device *priv = mport->priv;
int err = 0;
err = request_irq(priv->msix[TSI721_VECT_IDB].vector,
tsi721_sr2pc_ch_msix, 0,
priv->msix[TSI721_VECT_IDB].irq_name, (void *)mport);
if (err)
goto out;
err = request_irq(priv->msix[TSI721_VECT_PWRX].vector,
tsi721_srio_msix, 0,
priv->msix[TSI721_VECT_PWRX].irq_name, (void *)mport);
if (err)
free_irq(
priv->msix[TSI721_VECT_IDB].vector,
(void *)mport);
out:
return err;
}
/**
* tsi721_enable_msix - Attempts to enable MSI-X support for Tsi721.
* @priv: pointer to tsi721 private data
*
* Configures MSI-X support for Tsi721. Supports only an exact number
* of requested vectors.
*/
static int tsi721_enable_msix(struct tsi721_device *priv)
{
struct msix_entry entries[TSI721_VECT_MAX];
int err;
int i;
entries[TSI721_VECT_IDB].entry = TSI721_MSIX_SR2PC_IDBQ_RCV(IDB_QUEUE);
entries[TSI721_VECT_PWRX].entry = TSI721_MSIX_SRIO_MAC_INT;
/*
* Initialize MSI-X entries for Messaging Engine:
* this driver supports four RIO mailboxes (inbound and outbound)
* NOTE: Inbound message MBOX 0...4 use IB channels 4...7. Therefore
* offset +4 is added to IB MBOX number.
*/
for (i = 0; i < RIO_MAX_MBOX; i++) {
entries[TSI721_VECT_IMB0_RCV + i].entry =
TSI721_MSIX_IMSG_DQ_RCV(i + 4);
entries[TSI721_VECT_IMB0_INT + i].entry =
TSI721_MSIX_IMSG_INT(i + 4);
entries[TSI721_VECT_OMB0_DONE + i].entry =
TSI721_MSIX_OMSG_DONE(i);
entries[TSI721_VECT_OMB0_INT + i].entry =
TSI721_MSIX_OMSG_INT(i);
}
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
/*
* Initialize MSI-X entries for Block DMA Engine:
* this driver supports XXX DMA channels
* (one is reserved for SRIO maintenance transactions)
*/
for (i = 0; i < TSI721_DMA_CHNUM; i++) {
entries[TSI721_VECT_DMA0_DONE + i].entry =
TSI721_MSIX_DMACH_DONE(i);
entries[TSI721_VECT_DMA0_INT + i].entry =
TSI721_MSIX_DMACH_INT(i);
}
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
err = pci_enable_msix(priv->pdev, entries, ARRAY_SIZE(entries));
if (err) {
if (err > 0)
dev_info(&priv->pdev->dev,
"Only %d MSI-X vectors available, "
"not using MSI-X\n", err);
else
dev_err(&priv->pdev->dev,
"Failed to enable MSI-X (err=%d)\n", err);
return err;
}
/*
* Copy MSI-X vector information into tsi721 private structure
*/
priv->msix[TSI721_VECT_IDB].vector = entries[TSI721_VECT_IDB].vector;
snprintf(priv->msix[TSI721_VECT_IDB].irq_name, IRQ_DEVICE_NAME_MAX,
DRV_NAME "-idb@pci:%s", pci_name(priv->pdev));
priv->msix[TSI721_VECT_PWRX].vector = entries[TSI721_VECT_PWRX].vector;
snprintf(priv->msix[TSI721_VECT_PWRX].irq_name, IRQ_DEVICE_NAME_MAX,
DRV_NAME "-pwrx@pci:%s", pci_name(priv->pdev));
for (i = 0; i < RIO_MAX_MBOX; i++) {
priv->msix[TSI721_VECT_IMB0_RCV + i].vector =
entries[TSI721_VECT_IMB0_RCV + i].vector;
snprintf(priv->msix[TSI721_VECT_IMB0_RCV + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-imbr%d@pci:%s",
i, pci_name(priv->pdev));
priv->msix[TSI721_VECT_IMB0_INT + i].vector =
entries[TSI721_VECT_IMB0_INT + i].vector;
snprintf(priv->msix[TSI721_VECT_IMB0_INT + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-imbi%d@pci:%s",
i, pci_name(priv->pdev));
priv->msix[TSI721_VECT_OMB0_DONE + i].vector =
entries[TSI721_VECT_OMB0_DONE + i].vector;
snprintf(priv->msix[TSI721_VECT_OMB0_DONE + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-ombd%d@pci:%s",
i, pci_name(priv->pdev));
priv->msix[TSI721_VECT_OMB0_INT + i].vector =
entries[TSI721_VECT_OMB0_INT + i].vector;
snprintf(priv->msix[TSI721_VECT_OMB0_INT + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-ombi%d@pci:%s",
i, pci_name(priv->pdev));
}
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
for (i = 0; i < TSI721_DMA_CHNUM; i++) {
priv->msix[TSI721_VECT_DMA0_DONE + i].vector =
entries[TSI721_VECT_DMA0_DONE + i].vector;
snprintf(priv->msix[TSI721_VECT_DMA0_DONE + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmad%d@pci:%s",
i, pci_name(priv->pdev));
priv->msix[TSI721_VECT_DMA0_INT + i].vector =
entries[TSI721_VECT_DMA0_INT + i].vector;
snprintf(priv->msix[TSI721_VECT_DMA0_INT + i].irq_name,
IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmai%d@pci:%s",
i, pci_name(priv->pdev));
}
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
return 0;
}
#endif /* CONFIG_PCI_MSI */
static int tsi721_request_irq(struct rio_mport *mport)
{
struct tsi721_device *priv = mport->priv;
int err;
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX)
err = tsi721_request_msix(mport);
else
#endif
err = request_irq(priv->pdev->irq, tsi721_irqhandler,
(priv->flags & TSI721_USING_MSI) ? 0 : IRQF_SHARED,
DRV_NAME, (void *)mport);
if (err)
dev_err(&priv->pdev->dev,
"Unable to allocate interrupt, Error: %d\n", err);
return err;
}
/**
* tsi721_init_pc2sr_mapping - initializes outbound (PCIe->SRIO)
* translation regions.
* @priv: pointer to tsi721 private data
*
* Disables SREP translation regions.
*/
static void tsi721_init_pc2sr_mapping(struct tsi721_device *priv)
{
int i;
/* Disable all PC2SR translation windows */
for (i = 0; i < TSI721_OBWIN_NUM; i++)
iowrite32(0, priv->regs + TSI721_OBWINLB(i));
}
/**
* tsi721_init_sr2pc_mapping - initializes inbound (SRIO->PCIe)
* translation regions.
* @priv: pointer to tsi721 private data
*
* Disables inbound windows.
*/
static void tsi721_init_sr2pc_mapping(struct tsi721_device *priv)
{
int i;
/* Disable all SR2PC inbound windows */
for (i = 0; i < TSI721_IBWIN_NUM; i++)
iowrite32(0, priv->regs + TSI721_IBWINLB(i));
}
/**
* tsi721_port_write_init - Inbound port write interface init
* @priv: pointer to tsi721 private data
*
* Initializes inbound port write handler.
* Returns %0 on success or %-ENOMEM on failure.
*/
static int tsi721_port_write_init(struct tsi721_device *priv)
{
priv->pw_discard_count = 0;
INIT_WORK(&priv->pw_work, tsi721_pw_dpc);
spin_lock_init(&priv->pw_fifo_lock);
if (kfifo_alloc(&priv->pw_fifo,
TSI721_RIO_PW_MSG_SIZE * 32, GFP_KERNEL)) {
dev_err(&priv->pdev->dev, "PW FIFO allocation failed\n");
return -ENOMEM;
}
/* Use reliable port-write capture mode */
iowrite32(TSI721_RIO_PW_CTL_PWC_REL, priv->regs + TSI721_RIO_PW_CTL);
return 0;
}
static int tsi721_doorbell_init(struct tsi721_device *priv)
{
/* Outbound Doorbells do not require any setup.
* Tsi721 uses dedicated PCI BAR1 to generate doorbells.
* That BAR1 was mapped during the probe routine.
*/
/* Initialize Inbound Doorbell processing DPC and queue */
priv->db_discard_count = 0;
INIT_WORK(&priv->idb_work, tsi721_db_dpc);
/* Allocate buffer for inbound doorbells queue */
priv->idb_base = dma_zalloc_coherent(&priv->pdev->dev,
IDB_QSIZE * TSI721_IDB_ENTRY_SIZE,
&priv->idb_dma, GFP_KERNEL);
if (!priv->idb_base)
return -ENOMEM;
dev_dbg(&priv->pdev->dev, "Allocated IDB buffer @ %p (phys = %llx)\n",
priv->idb_base, (unsigned long long)priv->idb_dma);
iowrite32(TSI721_IDQ_SIZE_VAL(IDB_QSIZE),
priv->regs + TSI721_IDQ_SIZE(IDB_QUEUE));
iowrite32(((u64)priv->idb_dma >> 32),
priv->regs + TSI721_IDQ_BASEU(IDB_QUEUE));
iowrite32(((u64)priv->idb_dma & TSI721_IDQ_BASEL_ADDR),
priv->regs + TSI721_IDQ_BASEL(IDB_QUEUE));
/* Enable accepting all inbound doorbells */
iowrite32(0, priv->regs + TSI721_IDQ_MASK(IDB_QUEUE));
iowrite32(TSI721_IDQ_INIT, priv->regs + TSI721_IDQ_CTL(IDB_QUEUE));
iowrite32(0, priv->regs + TSI721_IDQ_RP(IDB_QUEUE));
return 0;
}
static void tsi721_doorbell_free(struct tsi721_device *priv)
{
if (priv->idb_base == NULL)
return;
/* Free buffer allocated for inbound doorbell queue */
dma_free_coherent(&priv->pdev->dev, IDB_QSIZE * TSI721_IDB_ENTRY_SIZE,
priv->idb_base, priv->idb_dma);
priv->idb_base = NULL;
}
/**
* tsi721_bdma_maint_init - Initialize maintenance request BDMA channel.
* @priv: pointer to tsi721 private data
*
* Initialize BDMA channel allocated for RapidIO maintenance read/write
* request generation
* Returns %0 on success or %-ENOMEM on failure.
*/
static int tsi721_bdma_maint_init(struct tsi721_device *priv)
{
struct tsi721_dma_desc *bd_ptr;
u64 *sts_ptr;
dma_addr_t bd_phys, sts_phys;
int sts_size;
int bd_num = 2;
void __iomem *regs;
dev_dbg(&priv->pdev->dev,
"Init Block DMA Engine for Maintenance requests, CH%d\n",
TSI721_DMACH_MAINT);
/*
* Initialize DMA channel for maintenance requests
*/
priv->mdma.ch_id = TSI721_DMACH_MAINT;
regs = priv->regs + TSI721_DMAC_BASE(TSI721_DMACH_MAINT);
/* Allocate space for DMA descriptors */
bd_ptr = dma_zalloc_coherent(&priv->pdev->dev,
bd_num * sizeof(struct tsi721_dma_desc),
&bd_phys, GFP_KERNEL);
if (!bd_ptr)
return -ENOMEM;
priv->mdma.bd_num = bd_num;
priv->mdma.bd_phys = bd_phys;
priv->mdma.bd_base = bd_ptr;
dev_dbg(&priv->pdev->dev, "DMA descriptors @ %p (phys = %llx)\n",
bd_ptr, (unsigned long long)bd_phys);
/* Allocate space for descriptor status FIFO */
sts_size = (bd_num >= TSI721_DMA_MINSTSSZ) ?
bd_num : TSI721_DMA_MINSTSSZ;
sts_size = roundup_pow_of_two(sts_size);
sts_ptr = dma_zalloc_coherent(&priv->pdev->dev,
sts_size * sizeof(struct tsi721_dma_sts),
&sts_phys, GFP_KERNEL);
if (!sts_ptr) {
/* Free space allocated for DMA descriptors */
dma_free_coherent(&priv->pdev->dev,
bd_num * sizeof(struct tsi721_dma_desc),
bd_ptr, bd_phys);
priv->mdma.bd_base = NULL;
return -ENOMEM;
}
priv->mdma.sts_phys = sts_phys;
priv->mdma.sts_base = sts_ptr;
priv->mdma.sts_size = sts_size;
dev_dbg(&priv->pdev->dev,
"desc status FIFO @ %p (phys = %llx) size=0x%x\n",
sts_ptr, (unsigned long long)sts_phys, sts_size);
/* Initialize DMA descriptors ring */
bd_ptr[bd_num - 1].type_id = cpu_to_le32(DTYPE3 << 29);
bd_ptr[bd_num - 1].next_lo = cpu_to_le32((u64)bd_phys &
TSI721_DMAC_DPTRL_MASK);
bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);
/* Setup DMA descriptor pointers */
iowrite32(((u64)bd_phys >> 32), regs + TSI721_DMAC_DPTRH);
iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
regs + TSI721_DMAC_DPTRL);
/* Setup descriptor status FIFO */
iowrite32(((u64)sts_phys >> 32), regs + TSI721_DMAC_DSBH);
iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
regs + TSI721_DMAC_DSBL);
iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
regs + TSI721_DMAC_DSSZ);
/* Clear interrupt bits */
iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
ioread32(regs + TSI721_DMAC_INT);
/* Toggle DMA channel initialization */
iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
ioread32(regs + TSI721_DMAC_CTL);
udelay(10);
return 0;
}
static int tsi721_bdma_maint_free(struct tsi721_device *priv)
{
u32 ch_stat;
struct tsi721_bdma_maint *mdma = &priv->mdma;
void __iomem *regs = priv->regs + TSI721_DMAC_BASE(mdma->ch_id);
if (mdma->bd_base == NULL)
return 0;
/* Check if DMA channel still running */
ch_stat = ioread32(regs + TSI721_DMAC_STS);
if (ch_stat & TSI721_DMAC_STS_RUN)
return -EFAULT;
/* Put DMA channel into init state */
iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
/* Free space allocated for DMA descriptors */
dma_free_coherent(&priv->pdev->dev,
mdma->bd_num * sizeof(struct tsi721_dma_desc),
mdma->bd_base, mdma->bd_phys);
mdma->bd_base = NULL;
/* Free space allocated for status FIFO */
dma_free_coherent(&priv->pdev->dev,
mdma->sts_size * sizeof(struct tsi721_dma_sts),
mdma->sts_base, mdma->sts_phys);
mdma->sts_base = NULL;
return 0;
}
/* Enable Inbound Messaging Interrupts */
static void
tsi721_imsg_interrupt_enable(struct tsi721_device *priv, int ch,
u32 inte_mask)
{
u32 rval;
if (!inte_mask)
return;
/* Clear pending Inbound Messaging interrupts */
iowrite32(inte_mask, priv->regs + TSI721_IBDMAC_INT(ch));
/* Enable Inbound Messaging interrupts */
rval = ioread32(priv->regs + TSI721_IBDMAC_INTE(ch));
iowrite32(rval | inte_mask, priv->regs + TSI721_IBDMAC_INTE(ch));
if (priv->flags & TSI721_USING_MSIX)
return; /* Finished if we are in MSI-X mode */
/*
* For MSI and INTA interrupt signalling we need to enable next levels
*/
/* Enable Device Channel Interrupt */
rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
iowrite32(rval | TSI721_INT_IMSG_CHAN(ch),
priv->regs + TSI721_DEV_CHAN_INTE);
}
/* Disable Inbound Messaging Interrupts */
static void
tsi721_imsg_interrupt_disable(struct tsi721_device *priv, int ch,
u32 inte_mask)
{
u32 rval;
if (!inte_mask)
return;
/* Clear pending Inbound Messaging interrupts */
iowrite32(inte_mask, priv->regs + TSI721_IBDMAC_INT(ch));
/* Disable Inbound Messaging interrupts */
rval = ioread32(priv->regs + TSI721_IBDMAC_INTE(ch));
rval &= ~inte_mask;
iowrite32(rval, priv->regs + TSI721_IBDMAC_INTE(ch));
if (priv->flags & TSI721_USING_MSIX)
return; /* Finished if we are in MSI-X mode */
/*
* For MSI and INTA interrupt signalling we need to disable next levels
*/
/* Disable Device Channel Interrupt */
rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
rval &= ~TSI721_INT_IMSG_CHAN(ch);
iowrite32(rval, priv->regs + TSI721_DEV_CHAN_INTE);
}
/* Enable Outbound Messaging interrupts */
static void
tsi721_omsg_interrupt_enable(struct tsi721_device *priv, int ch,
u32 inte_mask)
{
u32 rval;
if (!inte_mask)
return;
/* Clear pending Outbound Messaging interrupts */
iowrite32(inte_mask, priv->regs + TSI721_OBDMAC_INT(ch));
/* Enable Outbound Messaging channel interrupts */
rval = ioread32(priv->regs + TSI721_OBDMAC_INTE(ch));
iowrite32(rval | inte_mask, priv->regs + TSI721_OBDMAC_INTE(ch));
if (priv->flags & TSI721_USING_MSIX)
return; /* Finished if we are in MSI-X mode */
/*
* For MSI and INTA interrupt signalling we need to enable next levels
*/
/* Enable Device Channel Interrupt */
rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
iowrite32(rval | TSI721_INT_OMSG_CHAN(ch),
priv->regs + TSI721_DEV_CHAN_INTE);
}
/* Disable Outbound Messaging interrupts */
static void
tsi721_omsg_interrupt_disable(struct tsi721_device *priv, int ch,
u32 inte_mask)
{
u32 rval;
if (!inte_mask)
return;
/* Clear pending Outbound Messaging interrupts */
iowrite32(inte_mask, priv->regs + TSI721_OBDMAC_INT(ch));
/* Disable Outbound Messaging interrupts */
rval = ioread32(priv->regs + TSI721_OBDMAC_INTE(ch));
rval &= ~inte_mask;
iowrite32(rval, priv->regs + TSI721_OBDMAC_INTE(ch));
if (priv->flags & TSI721_USING_MSIX)
return; /* Finished if we are in MSI-X mode */
/*
* For MSI and INTA interrupt signalling we need to disable next levels
*/
/* Disable Device Channel Interrupt */
rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
rval &= ~TSI721_INT_OMSG_CHAN(ch);
iowrite32(rval, priv->regs + TSI721_DEV_CHAN_INTE);
}
/**
* tsi721_add_outb_message - Add message to the Tsi721 outbound message queue
* @mport: Master port with outbound message queue
* @rdev: Target of outbound message
* @mbox: Outbound mailbox
* @buffer: Message to add to outbound queue
* @len: Length of message
*/
static int
tsi721_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
void *buffer, size_t len)
{
struct tsi721_device *priv = mport->priv;
struct tsi721_omsg_desc *desc;
u32 tx_slot;
if (!priv->omsg_init[mbox] ||
len > TSI721_MSG_MAX_SIZE || len < 8)
return -EINVAL;
tx_slot = priv->omsg_ring[mbox].tx_slot;
/* Copy copy message into transfer buffer */
memcpy(priv->omsg_ring[mbox].omq_base[tx_slot], buffer, len);
if (len & 0x7)
len += 8;
/* Build descriptor associated with buffer */
desc = priv->omsg_ring[mbox].omd_base;
desc[tx_slot].type_id = cpu_to_le32((DTYPE4 << 29) | rdev->destid);
if (tx_slot % 4 == 0)
desc[tx_slot].type_id |= cpu_to_le32(TSI721_OMD_IOF);
desc[tx_slot].msg_info =
cpu_to_le32((mport->sys_size << 26) | (mbox << 22) |
(0xe << 12) | (len & 0xff8));
desc[tx_slot].bufptr_lo =
cpu_to_le32((u64)priv->omsg_ring[mbox].omq_phys[tx_slot] &
0xffffffff);
desc[tx_slot].bufptr_hi =
cpu_to_le32((u64)priv->omsg_ring[mbox].omq_phys[tx_slot] >> 32);
priv->omsg_ring[mbox].wr_count++;
/* Go to next descriptor */
if (++priv->omsg_ring[mbox].tx_slot == priv->omsg_ring[mbox].size) {
priv->omsg_ring[mbox].tx_slot = 0;
/* Move through the ring link descriptor at the end */
priv->omsg_ring[mbox].wr_count++;
}
mb();
/* Set new write count value */
iowrite32(priv->omsg_ring[mbox].wr_count,
priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
return 0;
}
/**
* tsi721_omsg_handler - Outbound Message Interrupt Handler
* @priv: pointer to tsi721 private data
* @ch: number of OB MSG channel to service
*
* Services channel interrupts from outbound messaging engine.
*/
static void tsi721_omsg_handler(struct tsi721_device *priv, int ch)
{
u32 omsg_int;
spin_lock(&priv->omsg_ring[ch].lock);
omsg_int = ioread32(priv->regs + TSI721_OBDMAC_INT(ch));
if (omsg_int & TSI721_OBDMAC_INT_ST_FULL)
dev_info(&priv->pdev->dev,
"OB MBOX%d: Status FIFO is full\n", ch);
if (omsg_int & (TSI721_OBDMAC_INT_DONE | TSI721_OBDMAC_INT_IOF_DONE)) {
u32 srd_ptr;
u64 *sts_ptr, last_ptr = 0, prev_ptr = 0;
int i, j;
u32 tx_slot;
/*
* Find last successfully processed descriptor
*/
/* Check and clear descriptor status FIFO entries */
srd_ptr = priv->omsg_ring[ch].sts_rdptr;
sts_ptr = priv->omsg_ring[ch].sts_base;
j = srd_ptr * 8;
while (sts_ptr[j]) {
for (i = 0; i < 8 && sts_ptr[j]; i++, j++) {
prev_ptr = last_ptr;
last_ptr = le64_to_cpu(sts_ptr[j]);
sts_ptr[j] = 0;
}
++srd_ptr;
srd_ptr %= priv->omsg_ring[ch].sts_size;
j = srd_ptr * 8;
}
if (last_ptr == 0)
goto no_sts_update;
priv->omsg_ring[ch].sts_rdptr = srd_ptr;
iowrite32(srd_ptr, priv->regs + TSI721_OBDMAC_DSRP(ch));
if (!priv->mport->outb_msg[ch].mcback)
goto no_sts_update;
/* Inform upper layer about transfer completion */
tx_slot = (last_ptr - (u64)priv->omsg_ring[ch].omd_phys)/
sizeof(struct tsi721_omsg_desc);
/*
* Check if this is a Link Descriptor (LD).
* If yes, ignore LD and use descriptor processed
* before LD.
*/
if (tx_slot == priv->omsg_ring[ch].size) {
if (prev_ptr)
tx_slot = (prev_ptr -
(u64)priv->omsg_ring[ch].omd_phys)/
sizeof(struct tsi721_omsg_desc);
else
goto no_sts_update;
}
/* Move slot index to the next message to be sent */
++tx_slot;
if (tx_slot == priv->omsg_ring[ch].size)
tx_slot = 0;
BUG_ON(tx_slot >= priv->omsg_ring[ch].size);
priv->mport->outb_msg[ch].mcback(priv->mport,
priv->omsg_ring[ch].dev_id, ch,
tx_slot);
}
no_sts_update:
if (omsg_int & TSI721_OBDMAC_INT_ERROR) {
/*
* Outbound message operation aborted due to error,
* reinitialize OB MSG channel
*/
dev_dbg(&priv->pdev->dev, "OB MSG ABORT ch_stat=%x\n",
ioread32(priv->regs + TSI721_OBDMAC_STS(ch)));
iowrite32(TSI721_OBDMAC_INT_ERROR,
priv->regs + TSI721_OBDMAC_INT(ch));
iowrite32(TSI721_OBDMAC_CTL_INIT,
priv->regs + TSI721_OBDMAC_CTL(ch));
ioread32(priv->regs + TSI721_OBDMAC_CTL(ch));
/* Inform upper level to clear all pending tx slots */
if (priv->mport->outb_msg[ch].mcback)
priv->mport->outb_msg[ch].mcback(priv->mport,
priv->omsg_ring[ch].dev_id, ch,
priv->omsg_ring[ch].tx_slot);
/* Synch tx_slot tracking */
iowrite32(priv->omsg_ring[ch].tx_slot,
priv->regs + TSI721_OBDMAC_DRDCNT(ch));
ioread32(priv->regs + TSI721_OBDMAC_DRDCNT(ch));
priv->omsg_ring[ch].wr_count = priv->omsg_ring[ch].tx_slot;
priv->omsg_ring[ch].sts_rdptr = 0;
}
/* Clear channel interrupts */
iowrite32(omsg_int, priv->regs + TSI721_OBDMAC_INT(ch));
if (!(priv->flags & TSI721_USING_MSIX)) {
u32 ch_inte;
/* Re-enable channel interrupts */
ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
ch_inte |= TSI721_INT_OMSG_CHAN(ch);
iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
}
spin_unlock(&priv->omsg_ring[ch].lock);
}
/**
* tsi721_open_outb_mbox - Initialize Tsi721 outbound mailbox
* @mport: Master port implementing Outbound Messaging Engine
* @dev_id: Device specific pointer to pass on event
* @mbox: Mailbox to open
* @entries: Number of entries in the outbound mailbox ring
*/
static int tsi721_open_outb_mbox(struct rio_mport *mport, void *dev_id,
int mbox, int entries)
{
struct tsi721_device *priv = mport->priv;
struct tsi721_omsg_desc *bd_ptr;
int i, rc = 0;
if ((entries < TSI721_OMSGD_MIN_RING_SIZE) ||
(entries > (TSI721_OMSGD_RING_SIZE)) ||
(!is_power_of_2(entries)) || mbox >= RIO_MAX_MBOX) {
rc = -EINVAL;
goto out;
}
priv->omsg_ring[mbox].dev_id = dev_id;
priv->omsg_ring[mbox].size = entries;
priv->omsg_ring[mbox].sts_rdptr = 0;
spin_lock_init(&priv->omsg_ring[mbox].lock);
/* Outbound Msg Buffer allocation based on
the number of maximum descriptor entries */
for (i = 0; i < entries; i++) {
priv->omsg_ring[mbox].omq_base[i] =
dma_alloc_coherent(
&priv->pdev->dev, TSI721_MSG_BUFFER_SIZE,
&priv->omsg_ring[mbox].omq_phys[i],
GFP_KERNEL);
if (priv->omsg_ring[mbox].omq_base[i] == NULL) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate OB MSG data buffer for"
" MBOX%d\n", mbox);
rc = -ENOMEM;
goto out_buf;
}
}
/* Outbound message descriptor allocation */
priv->omsg_ring[mbox].omd_base = dma_alloc_coherent(
&priv->pdev->dev,
(entries + 1) * sizeof(struct tsi721_omsg_desc),
&priv->omsg_ring[mbox].omd_phys, GFP_KERNEL);
if (priv->omsg_ring[mbox].omd_base == NULL) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate OB MSG descriptor memory "
"for MBOX%d\n", mbox);
rc = -ENOMEM;
goto out_buf;
}
priv->omsg_ring[mbox].tx_slot = 0;
/* Outbound message descriptor status FIFO allocation */
priv->omsg_ring[mbox].sts_size = roundup_pow_of_two(entries + 1);
priv->omsg_ring[mbox].sts_base = dma_zalloc_coherent(&priv->pdev->dev,
priv->omsg_ring[mbox].sts_size *
sizeof(struct tsi721_dma_sts),
&priv->omsg_ring[mbox].sts_phys, GFP_KERNEL);
if (priv->omsg_ring[mbox].sts_base == NULL) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate OB MSG descriptor status FIFO "
"for MBOX%d\n", mbox);
rc = -ENOMEM;
goto out_desc;
}
/*
* Configure Outbound Messaging Engine
*/
/* Setup Outbound Message descriptor pointer */
iowrite32(((u64)priv->omsg_ring[mbox].omd_phys >> 32),
priv->regs + TSI721_OBDMAC_DPTRH(mbox));
iowrite32(((u64)priv->omsg_ring[mbox].omd_phys &
TSI721_OBDMAC_DPTRL_MASK),
priv->regs + TSI721_OBDMAC_DPTRL(mbox));
/* Setup Outbound Message descriptor status FIFO */
iowrite32(((u64)priv->omsg_ring[mbox].sts_phys >> 32),
priv->regs + TSI721_OBDMAC_DSBH(mbox));
iowrite32(((u64)priv->omsg_ring[mbox].sts_phys &
TSI721_OBDMAC_DSBL_MASK),
priv->regs + TSI721_OBDMAC_DSBL(mbox));
iowrite32(TSI721_DMAC_DSSZ_SIZE(priv->omsg_ring[mbox].sts_size),
priv->regs + (u32)TSI721_OBDMAC_DSSZ(mbox));
/* Enable interrupts */
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX) {
/* Request interrupt service if we are in MSI-X mode */
rc = request_irq(
priv->msix[TSI721_VECT_OMB0_DONE + mbox].vector,
tsi721_omsg_msix, 0,
priv->msix[TSI721_VECT_OMB0_DONE + mbox].irq_name,
(void *)mport);
if (rc) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate MSI-X interrupt for "
"OBOX%d-DONE\n", mbox);
goto out_stat;
}
rc = request_irq(priv->msix[TSI721_VECT_OMB0_INT + mbox].vector,
tsi721_omsg_msix, 0,
priv->msix[TSI721_VECT_OMB0_INT + mbox].irq_name,
(void *)mport);
if (rc) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate MSI-X interrupt for "
"MBOX%d-INT\n", mbox);
free_irq(
priv->msix[TSI721_VECT_OMB0_DONE + mbox].vector,
(void *)mport);
goto out_stat;
}
}
#endif /* CONFIG_PCI_MSI */
tsi721_omsg_interrupt_enable(priv, mbox, TSI721_OBDMAC_INT_ALL);
/* Initialize Outbound Message descriptors ring */
bd_ptr = priv->omsg_ring[mbox].omd_base;
bd_ptr[entries].type_id = cpu_to_le32(DTYPE5 << 29);
bd_ptr[entries].msg_info = 0;
bd_ptr[entries].next_lo =
cpu_to_le32((u64)priv->omsg_ring[mbox].omd_phys &
TSI721_OBDMAC_DPTRL_MASK);
bd_ptr[entries].next_hi =
cpu_to_le32((u64)priv->omsg_ring[mbox].omd_phys >> 32);
priv->omsg_ring[mbox].wr_count = 0;
mb();
/* Initialize Outbound Message engine */
iowrite32(TSI721_OBDMAC_CTL_INIT, priv->regs + TSI721_OBDMAC_CTL(mbox));
ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
udelay(10);
priv->omsg_init[mbox] = 1;
return 0;
#ifdef CONFIG_PCI_MSI
out_stat:
dma_free_coherent(&priv->pdev->dev,
priv->omsg_ring[mbox].sts_size * sizeof(struct tsi721_dma_sts),
priv->omsg_ring[mbox].sts_base,
priv->omsg_ring[mbox].sts_phys);
priv->omsg_ring[mbox].sts_base = NULL;
#endif /* CONFIG_PCI_MSI */
out_desc:
dma_free_coherent(&priv->pdev->dev,
(entries + 1) * sizeof(struct tsi721_omsg_desc),
priv->omsg_ring[mbox].omd_base,
priv->omsg_ring[mbox].omd_phys);
priv->omsg_ring[mbox].omd_base = NULL;
out_buf:
for (i = 0; i < priv->omsg_ring[mbox].size; i++) {
if (priv->omsg_ring[mbox].omq_base[i]) {
dma_free_coherent(&priv->pdev->dev,
TSI721_MSG_BUFFER_SIZE,
priv->omsg_ring[mbox].omq_base[i],
priv->omsg_ring[mbox].omq_phys[i]);
priv->omsg_ring[mbox].omq_base[i] = NULL;
}
}
out:
return rc;
}
/**
* tsi721_close_outb_mbox - Close Tsi721 outbound mailbox
* @mport: Master port implementing the outbound message unit
* @mbox: Mailbox to close
*/
static void tsi721_close_outb_mbox(struct rio_mport *mport, int mbox)
{
struct tsi721_device *priv = mport->priv;
u32 i;
if (!priv->omsg_init[mbox])
return;
priv->omsg_init[mbox] = 0;
/* Disable Interrupts */
tsi721_omsg_interrupt_disable(priv, mbox, TSI721_OBDMAC_INT_ALL);
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX) {
free_irq(priv->msix[TSI721_VECT_OMB0_DONE + mbox].vector,
(void *)mport);
free_irq(priv->msix[TSI721_VECT_OMB0_INT + mbox].vector,
(void *)mport);
}
#endif /* CONFIG_PCI_MSI */
/* Free OMSG Descriptor Status FIFO */
dma_free_coherent(&priv->pdev->dev,
priv->omsg_ring[mbox].sts_size * sizeof(struct tsi721_dma_sts),
priv->omsg_ring[mbox].sts_base,
priv->omsg_ring[mbox].sts_phys);
priv->omsg_ring[mbox].sts_base = NULL;
/* Free OMSG descriptors */
dma_free_coherent(&priv->pdev->dev,
(priv->omsg_ring[mbox].size + 1) *
sizeof(struct tsi721_omsg_desc),
priv->omsg_ring[mbox].omd_base,
priv->omsg_ring[mbox].omd_phys);
priv->omsg_ring[mbox].omd_base = NULL;
/* Free message buffers */
for (i = 0; i < priv->omsg_ring[mbox].size; i++) {
if (priv->omsg_ring[mbox].omq_base[i]) {
dma_free_coherent(&priv->pdev->dev,
TSI721_MSG_BUFFER_SIZE,
priv->omsg_ring[mbox].omq_base[i],
priv->omsg_ring[mbox].omq_phys[i]);
priv->omsg_ring[mbox].omq_base[i] = NULL;
}
}
}
/**
* tsi721_imsg_handler - Inbound Message Interrupt Handler
* @priv: pointer to tsi721 private data
* @ch: inbound message channel number to service
*
* Services channel interrupts from inbound messaging engine.
*/
static void tsi721_imsg_handler(struct tsi721_device *priv, int ch)
{
u32 mbox = ch - 4;
u32 imsg_int;
spin_lock(&priv->imsg_ring[mbox].lock);
imsg_int = ioread32(priv->regs + TSI721_IBDMAC_INT(ch));
if (imsg_int & TSI721_IBDMAC_INT_SRTO)
dev_info(&priv->pdev->dev, "IB MBOX%d SRIO timeout\n",
mbox);
if (imsg_int & TSI721_IBDMAC_INT_PC_ERROR)
dev_info(&priv->pdev->dev, "IB MBOX%d PCIe error\n",
mbox);
if (imsg_int & TSI721_IBDMAC_INT_FQ_LOW)
dev_info(&priv->pdev->dev,
"IB MBOX%d IB free queue low\n", mbox);
/* Clear IB channel interrupts */
iowrite32(imsg_int, priv->regs + TSI721_IBDMAC_INT(ch));
/* If an IB Msg is received notify the upper layer */
if (imsg_int & TSI721_IBDMAC_INT_DQ_RCV &&
priv->mport->inb_msg[mbox].mcback)
priv->mport->inb_msg[mbox].mcback(priv->mport,
priv->imsg_ring[mbox].dev_id, mbox, -1);
if (!(priv->flags & TSI721_USING_MSIX)) {
u32 ch_inte;
/* Re-enable channel interrupts */
ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
ch_inte |= TSI721_INT_IMSG_CHAN(ch);
iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
}
spin_unlock(&priv->imsg_ring[mbox].lock);
}
/**
* tsi721_open_inb_mbox - Initialize Tsi721 inbound mailbox
* @mport: Master port implementing the Inbound Messaging Engine
* @dev_id: Device specific pointer to pass on event
* @mbox: Mailbox to open
* @entries: Number of entries in the inbound mailbox ring
*/
static int tsi721_open_inb_mbox(struct rio_mport *mport, void *dev_id,
int mbox, int entries)
{
struct tsi721_device *priv = mport->priv;
int ch = mbox + 4;
int i;
u64 *free_ptr;
int rc = 0;
if ((entries < TSI721_IMSGD_MIN_RING_SIZE) ||
(entries > TSI721_IMSGD_RING_SIZE) ||
(!is_power_of_2(entries)) || mbox >= RIO_MAX_MBOX) {
rc = -EINVAL;
goto out;
}
/* Initialize IB Messaging Ring */
priv->imsg_ring[mbox].dev_id = dev_id;
priv->imsg_ring[mbox].size = entries;
priv->imsg_ring[mbox].rx_slot = 0;
priv->imsg_ring[mbox].desc_rdptr = 0;
priv->imsg_ring[mbox].fq_wrptr = 0;
for (i = 0; i < priv->imsg_ring[mbox].size; i++)
priv->imsg_ring[mbox].imq_base[i] = NULL;
spin_lock_init(&priv->imsg_ring[mbox].lock);
/* Allocate buffers for incoming messages */
priv->imsg_ring[mbox].buf_base =
dma_alloc_coherent(&priv->pdev->dev,
entries * TSI721_MSG_BUFFER_SIZE,
&priv->imsg_ring[mbox].buf_phys,
GFP_KERNEL);
if (priv->imsg_ring[mbox].buf_base == NULL) {
dev_err(&priv->pdev->dev,
"Failed to allocate buffers for IB MBOX%d\n", mbox);
rc = -ENOMEM;
goto out;
}
/* Allocate memory for circular free list */
priv->imsg_ring[mbox].imfq_base =
dma_alloc_coherent(&priv->pdev->dev,
entries * 8,
&priv->imsg_ring[mbox].imfq_phys,
GFP_KERNEL);
if (priv->imsg_ring[mbox].imfq_base == NULL) {
dev_err(&priv->pdev->dev,
"Failed to allocate free queue for IB MBOX%d\n", mbox);
rc = -ENOMEM;
goto out_buf;
}
/* Allocate memory for Inbound message descriptors */
priv->imsg_ring[mbox].imd_base =
dma_alloc_coherent(&priv->pdev->dev,
entries * sizeof(struct tsi721_imsg_desc),
&priv->imsg_ring[mbox].imd_phys, GFP_KERNEL);
if (priv->imsg_ring[mbox].imd_base == NULL) {
dev_err(&priv->pdev->dev,
"Failed to allocate descriptor memory for IB MBOX%d\n",
mbox);
rc = -ENOMEM;
goto out_dma;
}
/* Fill free buffer pointer list */
free_ptr = priv->imsg_ring[mbox].imfq_base;
for (i = 0; i < entries; i++)
free_ptr[i] = cpu_to_le64(
(u64)(priv->imsg_ring[mbox].buf_phys) +
i * 0x1000);
mb();
/*
* For mapping of inbound SRIO Messages into appropriate queues we need
* to set Inbound Device ID register in the messaging engine. We do it
* once when first inbound mailbox is requested.
*/
if (!(priv->flags & TSI721_IMSGID_SET)) {
iowrite32((u32)priv->mport->host_deviceid,
priv->regs + TSI721_IB_DEVID);
priv->flags |= TSI721_IMSGID_SET;
}
/*
* Configure Inbound Messaging channel (ch = mbox + 4)
*/
/* Setup Inbound Message free queue */
iowrite32(((u64)priv->imsg_ring[mbox].imfq_phys >> 32),
priv->regs + TSI721_IBDMAC_FQBH(ch));
iowrite32(((u64)priv->imsg_ring[mbox].imfq_phys &
TSI721_IBDMAC_FQBL_MASK),
priv->regs+TSI721_IBDMAC_FQBL(ch));
iowrite32(TSI721_DMAC_DSSZ_SIZE(entries),
priv->regs + TSI721_IBDMAC_FQSZ(ch));
/* Setup Inbound Message descriptor queue */
iowrite32(((u64)priv->imsg_ring[mbox].imd_phys >> 32),
priv->regs + TSI721_IBDMAC_DQBH(ch));
iowrite32(((u32)priv->imsg_ring[mbox].imd_phys &
(u32)TSI721_IBDMAC_DQBL_MASK),
priv->regs+TSI721_IBDMAC_DQBL(ch));
iowrite32(TSI721_DMAC_DSSZ_SIZE(entries),
priv->regs + TSI721_IBDMAC_DQSZ(ch));
/* Enable interrupts */
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX) {
/* Request interrupt service if we are in MSI-X mode */
rc = request_irq(priv->msix[TSI721_VECT_IMB0_RCV + mbox].vector,
tsi721_imsg_msix, 0,
priv->msix[TSI721_VECT_IMB0_RCV + mbox].irq_name,
(void *)mport);
if (rc) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate MSI-X interrupt for "
"IBOX%d-DONE\n", mbox);
goto out_desc;
}
rc = request_irq(priv->msix[TSI721_VECT_IMB0_INT + mbox].vector,
tsi721_imsg_msix, 0,
priv->msix[TSI721_VECT_IMB0_INT + mbox].irq_name,
(void *)mport);
if (rc) {
dev_dbg(&priv->pdev->dev,
"Unable to allocate MSI-X interrupt for "
"IBOX%d-INT\n", mbox);
free_irq(
priv->msix[TSI721_VECT_IMB0_RCV + mbox].vector,
(void *)mport);
goto out_desc;
}
}
#endif /* CONFIG_PCI_MSI */
tsi721_imsg_interrupt_enable(priv, ch, TSI721_IBDMAC_INT_ALL);
/* Initialize Inbound Message Engine */
iowrite32(TSI721_IBDMAC_CTL_INIT, priv->regs + TSI721_IBDMAC_CTL(ch));
ioread32(priv->regs + TSI721_IBDMAC_CTL(ch));
udelay(10);
priv->imsg_ring[mbox].fq_wrptr = entries - 1;
iowrite32(entries - 1, priv->regs + TSI721_IBDMAC_FQWP(ch));
priv->imsg_init[mbox] = 1;
return 0;
#ifdef CONFIG_PCI_MSI
out_desc:
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * sizeof(struct tsi721_imsg_desc),
priv->imsg_ring[mbox].imd_base,
priv->imsg_ring[mbox].imd_phys);
priv->imsg_ring[mbox].imd_base = NULL;
#endif /* CONFIG_PCI_MSI */
out_dma:
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * 8,
priv->imsg_ring[mbox].imfq_base,
priv->imsg_ring[mbox].imfq_phys);
priv->imsg_ring[mbox].imfq_base = NULL;
out_buf:
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * TSI721_MSG_BUFFER_SIZE,
priv->imsg_ring[mbox].buf_base,
priv->imsg_ring[mbox].buf_phys);
priv->imsg_ring[mbox].buf_base = NULL;
out:
return rc;
}
/**
* tsi721_close_inb_mbox - Shut down Tsi721 inbound mailbox
* @mport: Master port implementing the Inbound Messaging Engine
* @mbox: Mailbox to close
*/
static void tsi721_close_inb_mbox(struct rio_mport *mport, int mbox)
{
struct tsi721_device *priv = mport->priv;
u32 rx_slot;
int ch = mbox + 4;
if (!priv->imsg_init[mbox]) /* mbox isn't initialized yet */
return;
priv->imsg_init[mbox] = 0;
/* Disable Inbound Messaging Engine */
/* Disable Interrupts */
tsi721_imsg_interrupt_disable(priv, ch, TSI721_OBDMAC_INT_MASK);
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX) {
free_irq(priv->msix[TSI721_VECT_IMB0_RCV + mbox].vector,
(void *)mport);
free_irq(priv->msix[TSI721_VECT_IMB0_INT + mbox].vector,
(void *)mport);
}
#endif /* CONFIG_PCI_MSI */
/* Clear Inbound Buffer Queue */
for (rx_slot = 0; rx_slot < priv->imsg_ring[mbox].size; rx_slot++)
priv->imsg_ring[mbox].imq_base[rx_slot] = NULL;
/* Free memory allocated for message buffers */
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * TSI721_MSG_BUFFER_SIZE,
priv->imsg_ring[mbox].buf_base,
priv->imsg_ring[mbox].buf_phys);
priv->imsg_ring[mbox].buf_base = NULL;
/* Free memory allocated for free pointr list */
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * 8,
priv->imsg_ring[mbox].imfq_base,
priv->imsg_ring[mbox].imfq_phys);
priv->imsg_ring[mbox].imfq_base = NULL;
/* Free memory allocated for RX descriptors */
dma_free_coherent(&priv->pdev->dev,
priv->imsg_ring[mbox].size * sizeof(struct tsi721_imsg_desc),
priv->imsg_ring[mbox].imd_base,
priv->imsg_ring[mbox].imd_phys);
priv->imsg_ring[mbox].imd_base = NULL;
}
/**
* tsi721_add_inb_buffer - Add buffer to the Tsi721 inbound message queue
* @mport: Master port implementing the Inbound Messaging Engine
* @mbox: Inbound mailbox number
* @buf: Buffer to add to inbound queue
*/
static int tsi721_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
{
struct tsi721_device *priv = mport->priv;
u32 rx_slot;
int rc = 0;
rx_slot = priv->imsg_ring[mbox].rx_slot;
if (priv->imsg_ring[mbox].imq_base[rx_slot]) {
dev_err(&priv->pdev->dev,
"Error adding inbound buffer %d, buffer exists\n",
rx_slot);
rc = -EINVAL;
goto out;
}
priv->imsg_ring[mbox].imq_base[rx_slot] = buf;
if (++priv->imsg_ring[mbox].rx_slot == priv->imsg_ring[mbox].size)
priv->imsg_ring[mbox].rx_slot = 0;
out:
return rc;
}
/**
* tsi721_get_inb_message - Fetch inbound message from the Tsi721 MSG Queue
* @mport: Master port implementing the Inbound Messaging Engine
* @mbox: Inbound mailbox number
*
* Returns pointer to the message on success or NULL on failure.
*/
static void *tsi721_get_inb_message(struct rio_mport *mport, int mbox)
{
struct tsi721_device *priv = mport->priv;
struct tsi721_imsg_desc *desc;
u32 rx_slot;
void *rx_virt = NULL;
u64 rx_phys;
void *buf = NULL;
u64 *free_ptr;
int ch = mbox + 4;
int msg_size;
if (!priv->imsg_init[mbox])
return NULL;
desc = priv->imsg_ring[mbox].imd_base;
desc += priv->imsg_ring[mbox].desc_rdptr;
if (!(le32_to_cpu(desc->msg_info) & TSI721_IMD_HO))
goto out;
rx_slot = priv->imsg_ring[mbox].rx_slot;
while (priv->imsg_ring[mbox].imq_base[rx_slot] == NULL) {
if (++rx_slot == priv->imsg_ring[mbox].size)
rx_slot = 0;
}
rx_phys = ((u64)le32_to_cpu(desc->bufptr_hi) << 32) |
le32_to_cpu(desc->bufptr_lo);
rx_virt = priv->imsg_ring[mbox].buf_base +
(rx_phys - (u64)priv->imsg_ring[mbox].buf_phys);
buf = priv->imsg_ring[mbox].imq_base[rx_slot];
msg_size = le32_to_cpu(desc->msg_info) & TSI721_IMD_BCOUNT;
if (msg_size == 0)
msg_size = RIO_MAX_MSG_SIZE;
memcpy(buf, rx_virt, msg_size);
priv->imsg_ring[mbox].imq_base[rx_slot] = NULL;
desc->msg_info &= cpu_to_le32(~TSI721_IMD_HO);
if (++priv->imsg_ring[mbox].desc_rdptr == priv->imsg_ring[mbox].size)
priv->imsg_ring[mbox].desc_rdptr = 0;
iowrite32(priv->imsg_ring[mbox].desc_rdptr,
priv->regs + TSI721_IBDMAC_DQRP(ch));
/* Return free buffer into the pointer list */
free_ptr = priv->imsg_ring[mbox].imfq_base;
free_ptr[priv->imsg_ring[mbox].fq_wrptr] = cpu_to_le64(rx_phys);
if (++priv->imsg_ring[mbox].fq_wrptr == priv->imsg_ring[mbox].size)
priv->imsg_ring[mbox].fq_wrptr = 0;
iowrite32(priv->imsg_ring[mbox].fq_wrptr,
priv->regs + TSI721_IBDMAC_FQWP(ch));
out:
return buf;
}
/**
* tsi721_messages_init - Initialization of Messaging Engine
* @priv: pointer to tsi721 private data
*
* Configures Tsi721 messaging engine.
*/
static int tsi721_messages_init(struct tsi721_device *priv)
{
int ch;
iowrite32(0, priv->regs + TSI721_SMSG_ECC_LOG);
iowrite32(0, priv->regs + TSI721_RETRY_GEN_CNT);
iowrite32(0, priv->regs + TSI721_RETRY_RX_CNT);
/* Set SRIO Message Request/Response Timeout */
iowrite32(TSI721_RQRPTO_VAL, priv->regs + TSI721_RQRPTO);
/* Initialize Inbound Messaging Engine Registers */
for (ch = 0; ch < TSI721_IMSG_CHNUM; ch++) {
/* Clear interrupt bits */
iowrite32(TSI721_IBDMAC_INT_MASK,
priv->regs + TSI721_IBDMAC_INT(ch));
/* Clear Status */
iowrite32(0, priv->regs + TSI721_IBDMAC_STS(ch));
iowrite32(TSI721_SMSG_ECC_COR_LOG_MASK,
priv->regs + TSI721_SMSG_ECC_COR_LOG(ch));
iowrite32(TSI721_SMSG_ECC_NCOR_MASK,
priv->regs + TSI721_SMSG_ECC_NCOR(ch));
}
return 0;
}
/**
* tsi721_disable_ints - disables all device interrupts
* @priv: pointer to tsi721 private data
*/
static void tsi721_disable_ints(struct tsi721_device *priv)
{
int ch;
/* Disable all device level interrupts */
iowrite32(0, priv->regs + TSI721_DEV_INTE);
/* Disable all Device Channel interrupts */
iowrite32(0, priv->regs + TSI721_DEV_CHAN_INTE);
/* Disable all Inbound Msg Channel interrupts */
for (ch = 0; ch < TSI721_IMSG_CHNUM; ch++)
iowrite32(0, priv->regs + TSI721_IBDMAC_INTE(ch));
/* Disable all Outbound Msg Channel interrupts */
for (ch = 0; ch < TSI721_OMSG_CHNUM; ch++)
iowrite32(0, priv->regs + TSI721_OBDMAC_INTE(ch));
/* Disable all general messaging interrupts */
iowrite32(0, priv->regs + TSI721_SMSG_INTE);
/* Disable all BDMA Channel interrupts */
for (ch = 0; ch < TSI721_DMA_MAXCH; ch++)
iowrite32(0,
priv->regs + TSI721_DMAC_BASE(ch) + TSI721_DMAC_INTE);
/* Disable all general BDMA interrupts */
iowrite32(0, priv->regs + TSI721_BDMA_INTE);
/* Disable all SRIO Channel interrupts */
for (ch = 0; ch < TSI721_SRIO_MAXCH; ch++)
iowrite32(0, priv->regs + TSI721_SR_CHINTE(ch));
/* Disable all general SR2PC interrupts */
iowrite32(0, priv->regs + TSI721_SR2PC_GEN_INTE);
/* Disable all PC2SR interrupts */
iowrite32(0, priv->regs + TSI721_PC2SR_INTE);
/* Disable all I2C interrupts */
iowrite32(0, priv->regs + TSI721_I2C_INT_ENABLE);
/* Disable SRIO MAC interrupts */
iowrite32(0, priv->regs + TSI721_RIO_EM_INT_ENABLE);
iowrite32(0, priv->regs + TSI721_RIO_EM_DEV_INT_EN);
}
/**
* tsi721_setup_mport - Setup Tsi721 as RapidIO subsystem master port
* @priv: pointer to tsi721 private data
*
* Configures Tsi721 as RapidIO master port.
*/
static int __devinit tsi721_setup_mport(struct tsi721_device *priv)
{
struct pci_dev *pdev = priv->pdev;
int err = 0;
struct rio_ops *ops;
struct rio_mport *mport;
ops = kzalloc(sizeof(struct rio_ops), GFP_KERNEL);
if (!ops) {
dev_dbg(&pdev->dev, "Unable to allocate memory for rio_ops\n");
return -ENOMEM;
}
ops->lcread = tsi721_lcread;
ops->lcwrite = tsi721_lcwrite;
ops->cread = tsi721_cread_dma;
ops->cwrite = tsi721_cwrite_dma;
ops->dsend = tsi721_dsend;
ops->open_inb_mbox = tsi721_open_inb_mbox;
ops->close_inb_mbox = tsi721_close_inb_mbox;
ops->open_outb_mbox = tsi721_open_outb_mbox;
ops->close_outb_mbox = tsi721_close_outb_mbox;
ops->add_outb_message = tsi721_add_outb_message;
ops->add_inb_buffer = tsi721_add_inb_buffer;
ops->get_inb_message = tsi721_get_inb_message;
mport = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
if (!mport) {
kfree(ops);
dev_dbg(&pdev->dev, "Unable to allocate memory for mport\n");
return -ENOMEM;
}
mport->ops = ops;
mport->index = 0;
mport->sys_size = 0; /* small system */
mport->phy_type = RIO_PHY_SERIAL;
mport->priv = (void *)priv;
mport->phys_efptr = 0x100;
priv->mport = mport;
INIT_LIST_HEAD(&mport->dbells);
rio_init_dbell_res(&mport->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
rio_init_mbox_res(&mport->riores[RIO_INB_MBOX_RESOURCE], 0, 3);
rio_init_mbox_res(&mport->riores[RIO_OUTB_MBOX_RESOURCE], 0, 3);
strcpy(mport->name, "Tsi721 mport");
/* Hook up interrupt handler */
#ifdef CONFIG_PCI_MSI
if (!tsi721_enable_msix(priv))
priv->flags |= TSI721_USING_MSIX;
else if (!pci_enable_msi(pdev))
priv->flags |= TSI721_USING_MSI;
else
dev_info(&pdev->dev,
"MSI/MSI-X is not available. Using legacy INTx.\n");
#endif /* CONFIG_PCI_MSI */
err = tsi721_request_irq(mport);
if (!err) {
tsi721_interrupts_init(priv);
ops->pwenable = tsi721_pw_enable;
} else {
dev_err(&pdev->dev, "Unable to get assigned PCI IRQ "
"vector %02X err=0x%x\n", pdev->irq, err);
goto err_exit;
}
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
tsi721_register_dma(priv);
#endif
/* Enable SRIO link */
iowrite32(ioread32(priv->regs + TSI721_DEVCTL) |
TSI721_DEVCTL_SRBOOT_CMPL,
priv->regs + TSI721_DEVCTL);
rio_register_mport(mport);
if (mport->host_deviceid >= 0)
iowrite32(RIO_PORT_GEN_HOST | RIO_PORT_GEN_MASTER |
RIO_PORT_GEN_DISCOVERED,
priv->regs + (0x100 + RIO_PORT_GEN_CTL_CSR));
else
iowrite32(0, priv->regs + (0x100 + RIO_PORT_GEN_CTL_CSR));
return 0;
err_exit:
kfree(mport);
kfree(ops);
return err;
}
static int __devinit tsi721_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct tsi721_device *priv;
int i, cap;
int err;
u32 regval;
priv = kzalloc(sizeof(struct tsi721_device), GFP_KERNEL);
if (priv == NULL) {
dev_err(&pdev->dev, "Failed to allocate memory for device\n");
err = -ENOMEM;
goto err_exit;
}
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "Failed to enable PCI device\n");
goto err_clean;
}
priv->pdev = pdev;
#ifdef DEBUG
for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
dev_dbg(&pdev->dev, "res[%d] @ 0x%llx (0x%lx, 0x%lx)\n",
i, (unsigned long long)pci_resource_start(pdev, i),
(unsigned long)pci_resource_len(pdev, i),
pci_resource_flags(pdev, i));
}
#endif
/*
* Verify BAR configuration
*/
/* BAR_0 (registers) must be 512KB+ in 32-bit address space */
if (!(pci_resource_flags(pdev, BAR_0) & IORESOURCE_MEM) ||
pci_resource_flags(pdev, BAR_0) & IORESOURCE_MEM_64 ||
pci_resource_len(pdev, BAR_0) < TSI721_REG_SPACE_SIZE) {
dev_err(&pdev->dev,
"Missing or misconfigured CSR BAR0, aborting.\n");
err = -ENODEV;
goto err_disable_pdev;
}
/* BAR_1 (outbound doorbells) must be 16MB+ in 32-bit address space */
if (!(pci_resource_flags(pdev, BAR_1) & IORESOURCE_MEM) ||
pci_resource_flags(pdev, BAR_1) & IORESOURCE_MEM_64 ||
pci_resource_len(pdev, BAR_1) < TSI721_DB_WIN_SIZE) {
dev_err(&pdev->dev,
"Missing or misconfigured Doorbell BAR1, aborting.\n");
err = -ENODEV;
goto err_disable_pdev;
}
/*
* BAR_2 and BAR_4 (outbound translation) must be in 64-bit PCIe address
* space.
* NOTE: BAR_2 and BAR_4 are not used by this version of driver.
* It may be a good idea to keep them disabled using HW configuration
* to save PCI memory space.
*/
if ((pci_resource_flags(pdev, BAR_2) & IORESOURCE_MEM) &&
(pci_resource_flags(pdev, BAR_2) & IORESOURCE_MEM_64)) {
dev_info(&pdev->dev, "Outbound BAR2 is not used but enabled.\n");
}
if ((pci_resource_flags(pdev, BAR_4) & IORESOURCE_MEM) &&
(pci_resource_flags(pdev, BAR_4) & IORESOURCE_MEM_64)) {
dev_info(&pdev->dev, "Outbound BAR4 is not used but enabled.\n");
}
err = pci_request_regions(pdev, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "Cannot obtain PCI resources, "
"aborting.\n");
goto err_disable_pdev;
}
pci_set_master(pdev);
priv->regs = pci_ioremap_bar(pdev, BAR_0);
if (!priv->regs) {
dev_err(&pdev->dev,
"Unable to map device registers space, aborting\n");
err = -ENOMEM;
goto err_free_res;
}
priv->odb_base = pci_ioremap_bar(pdev, BAR_1);
if (!priv->odb_base) {
dev_err(&pdev->dev,
"Unable to map outbound doorbells space, aborting\n");
err = -ENOMEM;
goto err_unmap_bars;
}
/* Configure DMA attributes. */
if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
dev_info(&pdev->dev, "Unable to set DMA mask\n");
goto err_unmap_bars;
}
if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))
dev_info(&pdev->dev, "Unable to set consistent DMA mask\n");
} else {
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (err)
dev_info(&pdev->dev, "Unable to set consistent DMA mask\n");
}
cap = pci_pcie_cap(pdev);
BUG_ON(cap == 0);
/* Clear "no snoop" and "relaxed ordering" bits, use default MRRS. */
pci_read_config_dword(pdev, cap + PCI_EXP_DEVCTL, &regval);
regval &= ~(PCI_EXP_DEVCTL_READRQ | PCI_EXP_DEVCTL_RELAX_EN |
PCI_EXP_DEVCTL_NOSNOOP_EN);
regval |= 0x2 << MAX_READ_REQUEST_SZ_SHIFT;
pci_write_config_dword(pdev, cap + PCI_EXP_DEVCTL, regval);
/* Adjust PCIe completion timeout. */
pci_read_config_dword(pdev, cap + PCI_EXP_DEVCTL2, &regval);
regval &= ~(0x0f);
pci_write_config_dword(pdev, cap + PCI_EXP_DEVCTL2, regval | 0x2);
/*
* FIXUP: correct offsets of MSI-X tables in the MSI-X Capability Block
*/
pci_write_config_dword(pdev, TSI721_PCIECFG_EPCTL, 0x01);
pci_write_config_dword(pdev, TSI721_PCIECFG_MSIXTBL,
TSI721_MSIXTBL_OFFSET);
pci_write_config_dword(pdev, TSI721_PCIECFG_MSIXPBA,
TSI721_MSIXPBA_OFFSET);
pci_write_config_dword(pdev, TSI721_PCIECFG_EPCTL, 0);
/* End of FIXUP */
tsi721_disable_ints(priv);
tsi721_init_pc2sr_mapping(priv);
tsi721_init_sr2pc_mapping(priv);
if (tsi721_bdma_maint_init(priv)) {
dev_err(&pdev->dev, "BDMA initialization failed, aborting\n");
err = -ENOMEM;
goto err_unmap_bars;
}
err = tsi721_doorbell_init(priv);
if (err)
goto err_free_bdma;
tsi721_port_write_init(priv);
err = tsi721_messages_init(priv);
if (err)
goto err_free_consistent;
err = tsi721_setup_mport(priv);
if (err)
goto err_free_consistent;
return 0;
err_free_consistent:
tsi721_doorbell_free(priv);
err_free_bdma:
tsi721_bdma_maint_free(priv);
err_unmap_bars:
if (priv->regs)
iounmap(priv->regs);
if (priv->odb_base)
iounmap(priv->odb_base);
err_free_res:
pci_release_regions(pdev);
pci_clear_master(pdev);
err_disable_pdev:
pci_disable_device(pdev);
err_clean:
kfree(priv);
err_exit:
return err;
}
static DEFINE_PCI_DEVICE_TABLE(tsi721_pci_tbl) = {
{ PCI_DEVICE(PCI_VENDOR_ID_IDT, PCI_DEVICE_ID_TSI721) },
{ 0, } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, tsi721_pci_tbl);
static struct pci_driver tsi721_driver = {
.name = "tsi721",
.id_table = tsi721_pci_tbl,
.probe = tsi721_probe,
};
static int __init tsi721_init(void)
{
return pci_register_driver(&tsi721_driver);
}
static void __exit tsi721_exit(void)
{
pci_unregister_driver(&tsi721_driver);
}
device_initcall(tsi721_init);
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