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spi: spi-fsl-dspi: enabling Coldfire mcf5441x dspi 

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Angelo Dureghello 2017-10-28 00:23:01 +02:00 committed by Mark Brown
parent 2bd6bf03f4
commit ec7ed7708e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 77 additions and 22 deletions
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2
drivers/spi/Kconfig
View File

@ -379,7 +379,7 @@ config SPI_FSL_DSPI
tristate "Freescale DSPI controller"
select REGMAP_MMIO
depends on HAS_DMA
depends on SOC_VF610 || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST
depends on SOC_VF610 || SOC_LS1021A || ARCH_LAYERSCAPE || M5441x || COMPILE_TEST
help
This enables support for the Freescale DSPI controller in master
mode. VF610 platform uses the controller.

66
drivers/spi/spi-fsl-dspi.c
View File

@ -32,6 +32,7 @@
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-fsl-dspi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/time.h>
@ -151,6 +152,11 @@ static const struct fsl_dspi_devtype_data ls2085a_data = {
.max_clock_factor = 8,
};
static const struct fsl_dspi_devtype_data coldfire_data = {
.trans_mode = DSPI_EOQ_MODE,
.max_clock_factor = 8,
};
struct fsl_dspi_dma {
/* Length of transfer in words of DSPI_FIFO_SIZE */
u32 curr_xfer_len;
@ -741,6 +747,7 @@ static int dspi_setup(struct spi_device *spi)
{
struct chip_data *chip;
struct fsl_dspi *dspi = spi_master_get_devdata(spi->master);
struct fsl_dspi_platform_data *pdata;
u32 cs_sck_delay = 0, sck_cs_delay = 0;
unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
unsigned char pasc = 0, asc = 0, fmsz = 0;
@ -761,11 +768,18 @@ static int dspi_setup(struct spi_device *spi)
return -ENOMEM;
}
of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
&cs_sck_delay);
pdata = dev_get_platdata(&dspi->pdev->dev);
of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
&sck_cs_delay);
if (!pdata) {
of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
&cs_sck_delay);
of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
&sck_cs_delay);
} else {
cs_sck_delay = pdata->cs_sck_delay;
sck_cs_delay = pdata->sck_cs_delay;
}
chip->mcr_val = SPI_MCR_MASTER | SPI_MCR_PCSIS |
SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF;
@ -949,6 +963,7 @@ static int dspi_probe(struct platform_device *pdev)
struct fsl_dspi *dspi;
struct resource *res;
void __iomem *base;
struct fsl_dspi_platform_data *pdata;
int ret = 0, cs_num, bus_num;
master = spi_alloc_master(&pdev->dev, sizeof(struct fsl_dspi));
@ -969,25 +984,34 @@ static int dspi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_MASK(4) | SPI_BPW_MASK(8) |
SPI_BPW_MASK(16);
ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
if (ret < 0) {
dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
goto out_master_put;
}
master->num_chipselect = cs_num;
pdata = dev_get_platdata(&pdev->dev);
if (pdata) {
master->num_chipselect = pdata->cs_num;
master->bus_num = pdata->bus_num;
ret = of_property_read_u32(np, "bus-num", &bus_num);
if (ret < 0) {
dev_err(&pdev->dev, "can't get bus-num\n");
goto out_master_put;
}
master->bus_num = bus_num;
dspi->devtype_data = &coldfire_data;
} else {
dspi->devtype_data = of_device_get_match_data(&pdev->dev);
if (!dspi->devtype_data) {
dev_err(&pdev->dev, "can't get devtype_data\n");
ret = -EFAULT;
goto out_master_put;
ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
if (ret < 0) {
dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
goto out_master_put;
}
master->num_chipselect = cs_num;
ret = of_property_read_u32(np, "bus-num", &bus_num);
if (ret < 0) {
dev_err(&pdev->dev, "can't get bus-num\n");
goto out_master_put;
}
master->bus_num = bus_num;
dspi->devtype_data = of_device_get_match_data(&pdev->dev);
if (!dspi->devtype_data) {
dev_err(&pdev->dev, "can't get devtype_data\n");
ret = -EFAULT;
goto out_master_put;
}
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

31
include/linux/spi/spi-fsl-dspi.h Normal file
View File

@ -0,0 +1,31 @@
/*
* Freescale DSPI controller driver
*
* Copyright (c) 2017 Angelo Dureghello <angelo@sysam.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#ifndef SPI_FSL_DSPI_HEADER_H
#define SPI_FSL_DSPI_HEADER_H
/**
* struct fsl_dspi_platform_data - platform data for the Freescale DSPI driver
* @bus_num: board specific identifier for this DSPI driver.
* @cs_num: number of chip selects supported by this DSPI driver.
*/
struct fsl_dspi_platform_data {
u32 cs_num;
u32 bus_num;
u32 sck_cs_delay;
u32 cs_sck_delay;
};
#endif /* SPI_FSL_DSPI_HEADER_H */