leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/omap2-mcspi', 'spi/topic/orion', 'spi/topic/pic32' and 'spi/topic/pic32-sqi' into spi-next

Browse Source
This commit is contained in:
Mark Brown 2016-07-24 22:08:22 +01:00
commit ac3e62b820
11 changed files with 499 additions and 366 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
Documentation/devicetree/bindings/spi/spi-orion.txt
View File

@ -8,7 +8,15 @@ Required properties:
- "marvell,armada-380-spi", for the Armada 38x SoCs
- "marvell,armada-390-spi", for the Armada 39x SoCs
- "marvell,armada-xp-spi", for the Armada XP SoCs
- reg : offset and length of the register set for the device
- reg : offset and length of the register set for the device.
This property can optionally have additional entries to configure
the SPI direct access mode that some of the Marvell SoCs support
additionally to the normal indirect access (PIO) mode. The values
for the MBus "target" and "attribute" are defined in the Marvell
SoC "Functional Specifications" Manual in the chapter "Marvell
Core Processor Address Decoding".
The eight register sets following the control registers refer to
chip-select lines 0 through 7 respectively.
- cell-index : Which of multiple SPI controllers is this.
Optional properties:
- interrupts : Is currently not used.
@ -23,3 +31,42 @@ Example:
interrupts = <23>;
status = "disabled";
};
Example with SPI direct mode support (optionally):
spi0: spi@10600 {
compatible = "marvell,orion-spi";
#address-cells = <1>;
#size-cells = <0>;
cell-index = <0>;
reg = <MBUS_ID(0xf0, 0x01) 0x10600 0x28>, /* control */
<MBUS_ID(0x01, 0x1e) 0 0xffffffff>, /* CS0 */
<MBUS_ID(0x01, 0x5e) 0 0xffffffff>, /* CS1 */
<MBUS_ID(0x01, 0x9e) 0 0xffffffff>, /* CS2 */
<MBUS_ID(0x01, 0xde) 0 0xffffffff>, /* CS3 */
<MBUS_ID(0x01, 0x1f) 0 0xffffffff>, /* CS4 */
<MBUS_ID(0x01, 0x5f) 0 0xffffffff>, /* CS5 */
<MBUS_ID(0x01, 0x9f) 0 0xffffffff>, /* CS6 */
<MBUS_ID(0x01, 0xdf) 0 0xffffffff>; /* CS7 */
interrupts = <23>;
status = "disabled";
};
To enable the direct mode, the board specific 'ranges' property in the
'soc' node needs to add the entries for the desired SPI controllers
and its chip-selects that are used in the direct mode instead of PIO
mode. Here an example for this (SPI controller 0, device 1 and SPI
controller 1, device 2 are used in direct mode. All other SPI device
are used in the default indirect (PIO) mode):
soc {
/*
* Enable the SPI direct access by configuring an entry
* here in the board-specific ranges property
*/
ranges = <MBUS_ID(0xf0, 0x01) 0 0 0xf1000000 0x100000>, /* internal regs */
<MBUS_ID(0x01, 0x1d) 0 0 0xfff00000 0x100000>, /* BootROM */
<MBUS_ID(0x01, 0x5e) 0 0 0xf1100000 0x10000>, /* SPI0-DEV1 */
<MBUS_ID(0x01, 0x9a) 0 0 0xf1110000 0x10000>; /* SPI1-DEV2 */
For further information on the MBus bindings, please see the MBus
DT documentation:
Documentation/devicetree/bindings/bus/mvebu-mbus.txt

1
drivers/spi/Kconfig
View File

@ -411,6 +411,7 @@ config SPI_OMAP24XX
tristate "McSPI driver for OMAP"
depends on HAS_DMA
depends on ARCH_OMAP2PLUS || COMPILE_TEST
select SG_SPLIT
help
SPI master controller for OMAP24XX and later Multichannel SPI
(McSPI) modules.

1
drivers/spi/Makefile
View File

@ -56,6 +56,7 @@ obj-$(CONFIG_SPI_MT65XX) += spi-mt65xx.o
obj-$(CONFIG_SPI_MXS) += spi-mxs.o
obj-$(CONFIG_SPI_NUC900) += spi-nuc900.o
obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o
spi-octeon-objs := spi-cavium.o spi-cavium-octeon.o
obj-$(CONFIG_SPI_OCTEON) += spi-octeon.o
obj-$(CONFIG_SPI_OMAP_UWIRE) += spi-omap-uwire.o
obj-$(CONFIG_SPI_OMAP_100K) += spi-omap-100k.o

104
drivers/spi/spi-cavium-octeon.c Normal file
View File

@ -0,0 +1,104 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2011, 2012 Cavium, Inc.
*/
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <asm/octeon/octeon.h>
#include "spi-cavium.h"
static int octeon_spi_probe(struct platform_device *pdev)
{
struct resource *res_mem;
void __iomem *reg_base;
struct spi_master *master;
struct octeon_spi *p;
int err = -ENOENT;
master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi));
if (!master)
return -ENOMEM;
p = spi_master_get_devdata(master);
platform_set_drvdata(pdev, master);
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg_base = devm_ioremap_resource(&pdev->dev, res_mem);
if (IS_ERR(reg_base)) {
err = PTR_ERR(reg_base);
goto fail;
}
p->register_base = reg_base;
p->sys_freq = octeon_get_io_clock_rate();
p->regs.config = 0;
p->regs.status = 0x08;
p->regs.tx = 0x10;
p->regs.data = 0x80;
master->num_chipselect = 4;
master->mode_bits = SPI_CPHA |
SPI_CPOL |
SPI_CS_HIGH |
SPI_LSB_FIRST |
SPI_3WIRE;
master->transfer_one_message = octeon_spi_transfer_one_message;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
master->dev.of_node = pdev->dev.of_node;
err = devm_spi_register_master(&pdev->dev, master);
if (err) {
dev_err(&pdev->dev, "register master failed: %d\n", err);
goto fail;
}
dev_info(&pdev->dev, "OCTEON SPI bus driver\n");
return 0;
fail:
spi_master_put(master);
return err;
}
static int octeon_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct octeon_spi *p = spi_master_get_devdata(master);
/* Clear the CSENA* and put everything in a known state. */
writeq(0, p->register_base + OCTEON_SPI_CFG(p));
return 0;
}
static const struct of_device_id octeon_spi_match[] = {
{ .compatible = "cavium,octeon-3010-spi", },
{},
};
MODULE_DEVICE_TABLE(of, octeon_spi_match);
static struct platform_driver octeon_spi_driver = {
.driver = {
.name = "spi-octeon",
.of_match_table = octeon_spi_match,
},
.probe = octeon_spi_probe,
.remove = octeon_spi_remove,
};
module_platform_driver(octeon_spi_driver);
MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");

151
drivers/spi/spi-cavium.c Normal file
View File

@ -0,0 +1,151 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2011, 2012 Cavium, Inc.
*/
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/io.h>
#include "spi-cavium.h"
static void octeon_spi_wait_ready(struct octeon_spi *p)
{
union cvmx_mpi_sts mpi_sts;
unsigned int loops = 0;
do {
if (loops++)
__delay(500);
mpi_sts.u64 = readq(p->register_base + OCTEON_SPI_STS(p));
} while (mpi_sts.s.busy);
}
static int octeon_spi_do_transfer(struct octeon_spi *p,
struct spi_message *msg,
struct spi_transfer *xfer,
bool last_xfer)
{
struct spi_device *spi = msg->spi;
union cvmx_mpi_cfg mpi_cfg;
union cvmx_mpi_tx mpi_tx;
unsigned int clkdiv;
int mode;
bool cpha, cpol;
const u8 *tx_buf;
u8 *rx_buf;
int len;
int i;
mode = spi->mode;
cpha = mode & SPI_CPHA;
cpol = mode & SPI_CPOL;
clkdiv = p->sys_freq / (2 * xfer->speed_hz);
mpi_cfg.u64 = 0;
mpi_cfg.s.clkdiv = clkdiv;
mpi_cfg.s.cshi = (mode & SPI_CS_HIGH) ? 1 : 0;
mpi_cfg.s.lsbfirst = (mode & SPI_LSB_FIRST) ? 1 : 0;
mpi_cfg.s.wireor = (mode & SPI_3WIRE) ? 1 : 0;
mpi_cfg.s.idlelo = cpha != cpol;
mpi_cfg.s.cslate = cpha ? 1 : 0;
mpi_cfg.s.enable = 1;
if (spi->chip_select < 4)
p->cs_enax |= 1ull << (12 + spi->chip_select);
mpi_cfg.u64 |= p->cs_enax;
if (mpi_cfg.u64 != p->last_cfg) {
p->last_cfg = mpi_cfg.u64;
writeq(mpi_cfg.u64, p->register_base + OCTEON_SPI_CFG(p));
}
tx_buf = xfer->tx_buf;
rx_buf = xfer->rx_buf;
len = xfer->len;
while (len > OCTEON_SPI_MAX_BYTES) {
for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) {
u8 d;
if (tx_buf)
d = *tx_buf++;
else
d = 0;
writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
}
mpi_tx.u64 = 0;
mpi_tx.s.csid = spi->chip_select;
mpi_tx.s.leavecs = 1;
mpi_tx.s.txnum = tx_buf ? OCTEON_SPI_MAX_BYTES : 0;
mpi_tx.s.totnum = OCTEON_SPI_MAX_BYTES;
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p));
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) {
u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
*rx_buf++ = (u8)v;
}
len -= OCTEON_SPI_MAX_BYTES;
}
for (i = 0; i < len; i++) {
u8 d;
if (tx_buf)
d = *tx_buf++;
else
d = 0;
writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
}
mpi_tx.u64 = 0;
mpi_tx.s.csid = spi->chip_select;
if (last_xfer)
mpi_tx.s.leavecs = xfer->cs_change;
else
mpi_tx.s.leavecs = !xfer->cs_change;
mpi_tx.s.txnum = tx_buf ? len : 0;
mpi_tx.s.totnum = len;
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p));
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < len; i++) {
u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
*rx_buf++ = (u8)v;
}
if (xfer->delay_usecs)
udelay(xfer->delay_usecs);
return xfer->len;
}
int octeon_spi_transfer_one_message(struct spi_master *master,
struct spi_message *msg)
{
struct octeon_spi *p = spi_master_get_devdata(master);
unsigned int total_len = 0;
int status = 0;
struct spi_transfer *xfer;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
bool last_xfer = list_is_last(&xfer->transfer_list,
&msg->transfers);
int r = octeon_spi_do_transfer(p, msg, xfer, last_xfer);
if (r < 0) {
status = r;
goto err;
}
total_len += r;
}
err:
msg->status = status;
msg->actual_length = total_len;
spi_finalize_current_message(master);
return status;
}

59
arch/mips/include/asm/octeon/cvmx-mpi-defs.h → drivers/spi/spi-cavium.h
View File

@ -1,32 +1,33 @@
/***********************license start***************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2012 Cavium Networks
*
* This file 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.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
***********************license end**************************************/
#ifndef __SPI_CAVIUM_H
#define __SPI_CAVIUM_H
#ifndef __CVMX_MPI_DEFS_H__
#define __CVMX_MPI_DEFS_H__
#define OCTEON_SPI_MAX_BYTES 9
#define OCTEON_SPI_MAX_CLOCK_HZ 16000000
struct octeon_spi_regs {
int config;
int status;
int tx;
int data;
};
struct octeon_spi {
void __iomem *register_base;
u64 last_cfg;
u64 cs_enax;
int sys_freq;
struct octeon_spi_regs regs;
};
#define OCTEON_SPI_CFG(x) (x->regs.config)
#define OCTEON_SPI_STS(x) (x->regs.status)
#define OCTEON_SPI_TX(x) (x->regs.tx)
#define OCTEON_SPI_DAT0(x) (x->regs.data)
int octeon_spi_transfer_one_message(struct spi_master *master,
struct spi_message *msg);
/* MPI register descriptions */
#define CVMX_MPI_CFG (CVMX_ADD_IO_SEG(0x0001070000001000ull))
#define CVMX_MPI_DATX(offset) (CVMX_ADD_IO_SEG(0x0001070000001080ull) + ((offset) & 15) * 8)
@ -325,4 +326,4 @@ union cvmx_mpi_tx {
struct cvmx_mpi_tx_cn61xx cnf71xx;
};
#endif
#endif /* __SPI_CAVIUM_H */

255
drivers/spi/spi-octeon.c
View File

@ -1,255 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2011, 2012 Cavium, Inc.
*/
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-mpi-defs.h>
#define OCTEON_SPI_CFG 0
#define OCTEON_SPI_STS 0x08
#define OCTEON_SPI_TX 0x10
#define OCTEON_SPI_DAT0 0x80
#define OCTEON_SPI_MAX_BYTES 9
#define OCTEON_SPI_MAX_CLOCK_HZ 16000000
struct octeon_spi {
u64 register_base;
u64 last_cfg;
u64 cs_enax;
};
static void octeon_spi_wait_ready(struct octeon_spi *p)
{
union cvmx_mpi_sts mpi_sts;
unsigned int loops = 0;
do {
if (loops++)
__delay(500);
mpi_sts.u64 = cvmx_read_csr(p->register_base + OCTEON_SPI_STS);
} while (mpi_sts.s.busy);
}
static int octeon_spi_do_transfer(struct octeon_spi *p,
struct spi_message *msg,
struct spi_transfer *xfer,
bool last_xfer)
{
struct spi_device *spi = msg->spi;
union cvmx_mpi_cfg mpi_cfg;
union cvmx_mpi_tx mpi_tx;
unsigned int clkdiv;
unsigned int speed_hz;
int mode;
bool cpha, cpol;
const u8 *tx_buf;
u8 *rx_buf;
int len;
int i;
mode = spi->mode;
cpha = mode & SPI_CPHA;
cpol = mode & SPI_CPOL;
speed_hz = xfer->speed_hz;
clkdiv = octeon_get_io_clock_rate() / (2 * speed_hz);
mpi_cfg.u64 = 0;
mpi_cfg.s.clkdiv = clkdiv;
mpi_cfg.s.cshi = (mode & SPI_CS_HIGH) ? 1 : 0;
mpi_cfg.s.lsbfirst = (mode & SPI_LSB_FIRST) ? 1 : 0;
mpi_cfg.s.wireor = (mode & SPI_3WIRE) ? 1 : 0;
mpi_cfg.s.idlelo = cpha != cpol;
mpi_cfg.s.cslate = cpha ? 1 : 0;
mpi_cfg.s.enable = 1;
if (spi->chip_select < 4)
p->cs_enax |= 1ull << (12 + spi->chip_select);
mpi_cfg.u64 |= p->cs_enax;
if (mpi_cfg.u64 != p->last_cfg) {
p->last_cfg = mpi_cfg.u64;
cvmx_write_csr(p->register_base + OCTEON_SPI_CFG, mpi_cfg.u64);
}
tx_buf = xfer->tx_buf;
rx_buf = xfer->rx_buf;
len = xfer->len;
while (len > OCTEON_SPI_MAX_BYTES) {
for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) {
u8 d;
if (tx_buf)
d = *tx_buf++;
else
d = 0;
cvmx_write_csr(p->register_base + OCTEON_SPI_DAT0 + (8 * i), d);
}
mpi_tx.u64 = 0;
mpi_tx.s.csid = spi->chip_select;
mpi_tx.s.leavecs = 1;
mpi_tx.s.txnum = tx_buf ? OCTEON_SPI_MAX_BYTES : 0;
mpi_tx.s.totnum = OCTEON_SPI_MAX_BYTES;
cvmx_write_csr(p->register_base + OCTEON_SPI_TX, mpi_tx.u64);
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) {
u64 v = cvmx_read_csr(p->register_base + OCTEON_SPI_DAT0 + (8 * i));
*rx_buf++ = (u8)v;
}
len -= OCTEON_SPI_MAX_BYTES;
}
for (i = 0; i < len; i++) {
u8 d;
if (tx_buf)
d = *tx_buf++;
else
d = 0;
cvmx_write_csr(p->register_base + OCTEON_SPI_DAT0 + (8 * i), d);
}
mpi_tx.u64 = 0;
mpi_tx.s.csid = spi->chip_select;
if (last_xfer)
mpi_tx.s.leavecs = xfer->cs_change;
else
mpi_tx.s.leavecs = !xfer->cs_change;
mpi_tx.s.txnum = tx_buf ? len : 0;
mpi_tx.s.totnum = len;
cvmx_write_csr(p->register_base + OCTEON_SPI_TX, mpi_tx.u64);
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < len; i++) {
u64 v = cvmx_read_csr(p->register_base + OCTEON_SPI_DAT0 + (8 * i));
*rx_buf++ = (u8)v;
}
if (xfer->delay_usecs)
udelay(xfer->delay_usecs);
return xfer->len;
}
static int octeon_spi_transfer_one_message(struct spi_master *master,
struct spi_message *msg)
{
struct octeon_spi *p = spi_master_get_devdata(master);
unsigned int total_len = 0;
int status = 0;
struct spi_transfer *xfer;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
bool last_xfer = list_is_last(&xfer->transfer_list,
&msg->transfers);
int r = octeon_spi_do_transfer(p, msg, xfer, last_xfer);
if (r < 0) {
status = r;
goto err;
}
total_len += r;
}
err:
msg->status = status;
msg->actual_length = total_len;
spi_finalize_current_message(master);
return status;
}
static int octeon_spi_probe(struct platform_device *pdev)
{
struct resource *res_mem;
void __iomem *reg_base;
struct spi_master *master;
struct octeon_spi *p;
int err = -ENOENT;
master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi));
if (!master)
return -ENOMEM;
p = spi_master_get_devdata(master);
platform_set_drvdata(pdev, master);
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg_base = devm_ioremap_resource(&pdev->dev, res_mem);
if (IS_ERR(reg_base)) {
err = PTR_ERR(reg_base);
goto fail;
}
p->register_base = (u64)reg_base;
master->num_chipselect = 4;
master->mode_bits = SPI_CPHA |
SPI_CPOL |
SPI_CS_HIGH |
SPI_LSB_FIRST |
SPI_3WIRE;
master->transfer_one_message = octeon_spi_transfer_one_message;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
master->dev.of_node = pdev->dev.of_node;
err = devm_spi_register_master(&pdev->dev, master);
if (err) {
dev_err(&pdev->dev, "register master failed: %d\n", err);
goto fail;
}
dev_info(&pdev->dev, "OCTEON SPI bus driver\n");
return 0;
fail:
spi_master_put(master);
return err;
}
static int octeon_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct octeon_spi *p = spi_master_get_devdata(master);
u64 register_base = p->register_base;
/* Clear the CSENA* and put everything in a known state. */
cvmx_write_csr(register_base + OCTEON_SPI_CFG, 0);
return 0;
}
static const struct of_device_id octeon_spi_match[] = {
{ .compatible = "cavium,octeon-3010-spi", },
{},
};
MODULE_DEVICE_TABLE(of, octeon_spi_match);
static struct platform_driver octeon_spi_driver = {
.driver = {
.name = "spi-octeon",
.of_match_table = octeon_spi_match,
},
.probe = octeon_spi_probe,
.remove = octeon_spi_remove,
};
module_platform_driver(octeon_spi_driver);
MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");

145
drivers/spi/spi-omap2-mcspi.c
View File

@ -419,16 +419,13 @@ static void omap2_mcspi_tx_dma(struct spi_device *spi,
if (mcspi_dma->dma_tx) {
struct dma_async_tx_descriptor *tx;
struct scatterlist sg;
dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
sg_init_table(&sg, 1);
sg_dma_address(&sg) = xfer->tx_dma;
sg_dma_len(&sg) = xfer->len;
tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl,
xfer->tx_sg.nents,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (tx) {
tx->callback = omap2_mcspi_tx_callback;
tx->callback_param = spi;
@ -449,7 +446,10 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
{
struct omap2_mcspi *mcspi;
struct omap2_mcspi_dma *mcspi_dma;
unsigned int count, dma_count;
unsigned int count, transfer_reduction = 0;
struct scatterlist *sg_out[2];
int nb_sizes = 0, out_mapped_nents[2], ret, x;
size_t sizes[2];
u32 l;
int elements = 0;
int word_len, element_count;
@ -457,10 +457,14 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
mcspi = spi_master_get_devdata(spi->master);
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
count = xfer->len;
dma_count = xfer->len;
/*
* In the "End-of-Transfer Procedure" section for DMA RX in OMAP35x TRM
* it mentions reducing DMA transfer length by one element in master
* normal mode.
*/
if (mcspi->fifo_depth == 0)
dma_count -= es;
transfer_reduction = es;
word_len = cs->word_len;
l = mcspi_cached_chconf0(spi);
@ -474,20 +478,46 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
if (mcspi_dma->dma_rx) {
struct dma_async_tx_descriptor *tx;
struct scatterlist sg;
dmaengine_slave_config(mcspi_dma->dma_rx, &cfg);
/*
* Reduce DMA transfer length by one more if McSPI is
* configured in turbo mode.
*/
if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0)
dma_count -= es;
transfer_reduction += es;
sg_init_table(&sg, 1);
sg_dma_address(&sg) = xfer->rx_dma;
sg_dma_len(&sg) = dma_count;
if (transfer_reduction) {
/* Split sgl into two. The second sgl won't be used. */
sizes[0] = count - transfer_reduction;
sizes[1] = transfer_reduction;
nb_sizes = 2;
} else {
/*
* Don't bother splitting the sgl. This essentially
* clones the original sgl.
*/
sizes[0] = count;
nb_sizes = 1;
}
tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1,
DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT |
DMA_CTRL_ACK);
ret = sg_split(xfer->rx_sg.sgl, xfer->rx_sg.nents,
0, nb_sizes,
sizes,
sg_out, out_mapped_nents,
GFP_KERNEL);
if (ret < 0) {
dev_err(&spi->dev, "sg_split failed\n");
return 0;
}
tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx,
sg_out[0],
out_mapped_nents[0],
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (tx) {
tx->callback = omap2_mcspi_rx_callback;
tx->callback_param = spi;
@ -501,12 +531,17 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
omap2_mcspi_set_dma_req(spi, 1, 1);
wait_for_completion(&mcspi_dma->dma_rx_completion);
dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
DMA_FROM_DEVICE);
for (x = 0; x < nb_sizes; x++)
kfree(sg_out[x]);
if (mcspi->fifo_depth > 0)
return count;
/*
* Due to the DMA transfer length reduction the missing bytes must
* be read manually to receive all of the expected data.
*/
omap2_mcspi_set_enable(spi, 0);
elements = element_count - 1;
@ -615,8 +650,6 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
if (tx != NULL) {
wait_for_completion(&mcspi_dma->dma_tx_completion);
dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len,
DMA_TO_DEVICE);
if (mcspi->fifo_depth > 0) {
irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;
@ -1074,8 +1107,9 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
gpio_free(spi->cs_gpio);
}
static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
struct spi_device *spi, struct spi_transfer *t)
static int omap2_mcspi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *t)
{
/* We only enable one channel at a time -- the one whose message is
@ -1085,7 +1119,7 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
* chipselect with the FORCE bit ... CS != channel enable.
*/
struct spi_master *master;
struct omap2_mcspi *mcspi;
struct omap2_mcspi_dma *mcspi_dma;
struct omap2_mcspi_cs *cs;
struct omap2_mcspi_device_config *cd;
@ -1093,7 +1127,7 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
int status = 0;
u32 chconf;
master = spi->master;
mcspi = spi_master_get_devdata(master);
mcspi_dma = mcspi->dma_channels + spi->chip_select;
cs = spi->controller_state;
cd = spi->controller_data;
@ -1153,7 +1187,8 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
unsigned count;
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(t->len >= DMA_MIN_BYTES))
master->cur_msg_mapped &&
master->can_dma(master, spi, t))
omap2_mcspi_set_fifo(spi, t, 1);
omap2_mcspi_set_enable(spi, 1);
@ -1164,7 +1199,8 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
+ OMAP2_MCSPI_TX0);
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(t->len >= DMA_MIN_BYTES))
master->cur_msg_mapped &&
master->can_dma(master, spi, t))
count = omap2_mcspi_txrx_dma(spi, t);
else
count = omap2_mcspi_txrx_pio(spi, t);
@ -1233,55 +1269,11 @@ static int omap2_mcspi_prepare_message(struct spi_master *master,
return 0;
}
static int omap2_mcspi_transfer_one(struct spi_master *master,
struct spi_device *spi, struct spi_transfer *t)
static bool omap2_mcspi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct omap2_mcspi *mcspi;
struct omap2_mcspi_dma *mcspi_dma;
const void *tx_buf = t->tx_buf;
void *rx_buf = t->rx_buf;
unsigned len = t->len;
mcspi = spi_master_get_devdata(master);
mcspi_dma = mcspi->dma_channels + spi->chip_select;
if ((len && !(rx_buf || tx_buf))) {
dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
t->speed_hz,
len,
tx_buf ? "tx" : "",
rx_buf ? "rx" : "",
t->bits_per_word);
return -EINVAL;
}
if (len < DMA_MIN_BYTES)
goto skip_dma_map;
if (mcspi_dma->dma_tx && tx_buf != NULL) {
t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
len, DMA_TO_DEVICE);
if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'T', len);
return -EINVAL;
}
}
if (mcspi_dma->dma_rx && rx_buf != NULL) {
t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'R', len);
if (tx_buf != NULL)
dma_unmap_single(mcspi->dev, t->tx_dma,
len, DMA_TO_DEVICE);
return -EINVAL;
}
}
skip_dma_map:
return omap2_mcspi_work_one(mcspi, spi, t);
return (xfer->len >= DMA_MIN_BYTES);
}
static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
@ -1361,6 +1353,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
master->setup = omap2_mcspi_setup;
master->auto_runtime_pm = true;
master->prepare_message = omap2_mcspi_prepare_message;
master->can_dma = omap2_mcspi_can_dma;
master->transfer_one = omap2_mcspi_transfer_one;
master->set_cs = omap2_mcspi_set_cs;
master->cleanup = omap2_mcspi_cleanup;

88
drivers/spi/spi-orion.c
View File

@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/sizes.h>
@ -43,6 +44,9 @@
#define ORION_SPI_INT_CAUSE_REG 0x10
#define ORION_SPI_TIMING_PARAMS_REG 0x18
/* Register for the "Direct Mode" */
#define SPI_DIRECT_WRITE_CONFIG_REG 0x20
#define ORION_SPI_TMISO_SAMPLE_MASK (0x3 << 6)
#define ORION_SPI_TMISO_SAMPLE_1 (1 << 6)
#define ORION_SPI_TMISO_SAMPLE_2 (2 << 6)
@ -78,11 +82,18 @@ struct orion_spi_dev {
bool is_errata_50mhz_ac;
};
struct orion_direct_acc {
void __iomem *vaddr;
u32 size;
};
struct orion_spi {
struct spi_master *master;
void __iomem *base;
struct clk *clk;
const struct orion_spi_dev *devdata;
struct orion_direct_acc direct_access[ORION_NUM_CHIPSELECTS];
};
static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
@ -372,10 +383,39 @@ orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
{
unsigned int count;
int word_len;
struct orion_spi *orion_spi;
int cs = spi->chip_select;
word_len = spi->bits_per_word;
count = xfer->len;
orion_spi = spi_master_get_devdata(spi->master);
/*
* Use SPI direct write mode if base address is available. Otherwise
* fall back to PIO mode for this transfer.
*/
if ((orion_spi->direct_access[cs].vaddr) && (xfer->tx_buf) &&
(word_len == 8)) {
unsigned int cnt = count / 4;
unsigned int rem = count % 4;
/*
* Send the TX-data to the SPI device via the direct
* mapped address window
*/
iowrite32_rep(orion_spi->direct_access[cs].vaddr,
xfer->tx_buf, cnt);
if (rem) {
u32 *buf = (u32 *)xfer->tx_buf;
iowrite8_rep(orion_spi->direct_access[cs].vaddr,
&buf[cnt], rem);
}
return count;
}
if (word_len == 8) {
const u8 *tx = xfer->tx_buf;
u8 *rx = xfer->rx_buf;
@ -425,6 +465,10 @@ static int orion_spi_reset(struct orion_spi *orion_spi)
{
/* Verify that the CS is deasserted */
orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
/* Don't deassert CS between the direct mapped SPI transfers */
writel(0, spi_reg(orion_spi, SPI_DIRECT_WRITE_CONFIG_REG));
return 0;
}
@ -504,6 +548,7 @@ static int orion_spi_probe(struct platform_device *pdev)
struct resource *r;
unsigned long tclk_hz;
int status = 0;
struct device_node *np;
master = spi_alloc_master(&pdev->dev, sizeof(*spi));
if (master == NULL) {
@ -576,6 +621,49 @@ static int orion_spi_probe(struct platform_device *pdev)
goto out_rel_clk;
}
/* Scan all SPI devices of this controller for direct mapped devices */
for_each_available_child_of_node(pdev->dev.of_node, np) {
u32 cs;
/* Get chip-select number from the "reg" property */
status = of_property_read_u32(np, "reg", &cs);
if (status) {
dev_err(&pdev->dev,
"%s has no valid 'reg' property (%d)\n",
np->full_name, status);
status = 0;
continue;
}
/*
* Check if an address is configured for this SPI device. If
* not, the MBus mapping via the 'ranges' property in the 'soc'
* node is not configured and this device should not use the
* direct mode. In this case, just continue with the next
* device.
*/
status = of_address_to_resource(pdev->dev.of_node, cs + 1, r);
if (status)
continue;
/*
* Only map one page for direct access. This is enough for the
* simple TX transfer which only writes to the first word.
* This needs to get extended for the direct SPI-NOR / SPI-NAND
* support, once this gets implemented.
*/
spi->direct_access[cs].vaddr = devm_ioremap(&pdev->dev,
r->start,
PAGE_SIZE);
if (!spi->direct_access[cs].vaddr) {
status = -ENOMEM;
goto out_rel_clk;
}
spi->direct_access[cs].size = PAGE_SIZE;
dev_info(&pdev->dev, "CS%d configured for direct access\n", cs);
}
pm_runtime_set_active(&pdev->dev);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);

7
drivers/spi/spi-pic32-sqi.c
View File

@ -354,6 +354,7 @@ static int pic32_sqi_one_message(struct spi_master *master,
struct spi_transfer *xfer;
struct pic32_sqi *sqi;
int ret = 0, mode;
unsigned long timeout;
u32 val;
sqi = spi_master_get_devdata(master);
@ -419,10 +420,10 @@ static int pic32_sqi_one_message(struct spi_master *master,
writel(val, sqi->regs + PESQI_BD_CTRL_REG);
/* wait for xfer completion */
ret = wait_for_completion_timeout(&sqi->xfer_done, 5 * HZ);
if (ret <= 0) {
timeout = wait_for_completion_timeout(&sqi->xfer_done, 5 * HZ);
if (timeout == 0) {
dev_err(&sqi->master->dev, "wait timedout/interrupted\n");
ret = -EIO;
ret = -ETIMEDOUT;
msg->status = ret;
} else {
/* success */

5
drivers/spi/spi-pic32.c
View File

@ -507,6 +507,7 @@ static int pic32_spi_one_transfer(struct spi_master *master,
{
struct pic32_spi *pic32s;
bool dma_issued = false;
unsigned long timeout;
int ret;
pic32s = spi_master_get_devdata(master);
@ -553,8 +554,8 @@ static int pic32_spi_one_transfer(struct spi_master *master,
}
/* wait for completion */
ret = wait_for_completion_timeout(&pic32s->xfer_done, 2 * HZ);
if (ret <= 0) {
timeout = wait_for_completion_timeout(&pic32s->xfer_done, 2 * HZ);
if (timeout == 0) {
dev_err(&spi->dev, "wait error/timedout\n");
if (dma_issued) {
dmaengine_terminate_all(master->dma_rx);