161 строка
4.1 KiB
C
161 строка
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Freescale SPI/eSPI controller driver library.
|
|
*
|
|
* Maintainer: Kumar Gala
|
|
*
|
|
* Copyright (C) 2006 Polycom, Inc.
|
|
*
|
|
* CPM SPI and QE buffer descriptors mode support:
|
|
* Copyright (c) 2009 MontaVista Software, Inc.
|
|
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
|
|
*
|
|
* Copyright 2010 Freescale Semiconductor, Inc.
|
|
*/
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/fsl_devices.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/spi/spi.h>
|
|
#ifdef CONFIG_FSL_SOC
|
|
#include <sysdev/fsl_soc.h>
|
|
#endif
|
|
|
|
#include "spi-fsl-lib.h"
|
|
|
|
#define MPC8XXX_SPI_RX_BUF(type) \
|
|
void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
|
|
{ \
|
|
type *rx = mpc8xxx_spi->rx; \
|
|
*rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \
|
|
mpc8xxx_spi->rx = rx; \
|
|
} \
|
|
EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);
|
|
|
|
#define MPC8XXX_SPI_TX_BUF(type) \
|
|
u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \
|
|
{ \
|
|
u32 data; \
|
|
const type *tx = mpc8xxx_spi->tx; \
|
|
if (!tx) \
|
|
return 0; \
|
|
data = *tx++ << mpc8xxx_spi->tx_shift; \
|
|
mpc8xxx_spi->tx = tx; \
|
|
return data; \
|
|
} \
|
|
EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);
|
|
|
|
MPC8XXX_SPI_RX_BUF(u8)
|
|
MPC8XXX_SPI_RX_BUF(u16)
|
|
MPC8XXX_SPI_RX_BUF(u32)
|
|
MPC8XXX_SPI_TX_BUF(u8)
|
|
MPC8XXX_SPI_TX_BUF(u16)
|
|
MPC8XXX_SPI_TX_BUF(u32)
|
|
|
|
struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
|
|
{
|
|
return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
|
|
}
|
|
EXPORT_SYMBOL_GPL(to_of_pinfo);
|
|
|
|
const char *mpc8xxx_spi_strmode(unsigned int flags)
|
|
{
|
|
if (flags & SPI_QE_CPU_MODE) {
|
|
return "QE CPU";
|
|
} else if (flags & SPI_CPM_MODE) {
|
|
if (flags & SPI_QE)
|
|
return "QE";
|
|
else if (flags & SPI_CPM2)
|
|
return "CPM2";
|
|
else
|
|
return "CPM1";
|
|
}
|
|
return "CPU";
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);
|
|
|
|
void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
|
|
unsigned int irq)
|
|
{
|
|
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
|
|
struct spi_master *master;
|
|
struct mpc8xxx_spi *mpc8xxx_spi;
|
|
|
|
master = dev_get_drvdata(dev);
|
|
|
|
/* the spi->mode bits understood by this driver: */
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
|
|
| SPI_LSB_FIRST | SPI_LOOP;
|
|
|
|
master->dev.of_node = dev->of_node;
|
|
|
|
mpc8xxx_spi = spi_master_get_devdata(master);
|
|
mpc8xxx_spi->dev = dev;
|
|
mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
|
|
mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
|
|
mpc8xxx_spi->flags = pdata->flags;
|
|
mpc8xxx_spi->spibrg = pdata->sysclk;
|
|
mpc8xxx_spi->irq = irq;
|
|
|
|
mpc8xxx_spi->rx_shift = 0;
|
|
mpc8xxx_spi->tx_shift = 0;
|
|
|
|
master->bus_num = pdata->bus_num;
|
|
master->num_chipselect = pdata->max_chipselect;
|
|
|
|
init_completion(&mpc8xxx_spi->done);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
|
|
|
|
int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
|
|
{
|
|
struct device *dev = &ofdev->dev;
|
|
struct device_node *np = ofdev->dev.of_node;
|
|
struct mpc8xxx_spi_probe_info *pinfo;
|
|
struct fsl_spi_platform_data *pdata;
|
|
const void *prop;
|
|
int ret = -ENOMEM;
|
|
|
|
pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
|
|
if (!pinfo)
|
|
return ret;
|
|
|
|
pdata = &pinfo->pdata;
|
|
dev->platform_data = pdata;
|
|
|
|
/* Allocate bus num dynamically. */
|
|
pdata->bus_num = -1;
|
|
|
|
#ifdef CONFIG_FSL_SOC
|
|
/* SPI controller is either clocked from QE or SoC clock. */
|
|
pdata->sysclk = get_brgfreq();
|
|
if (pdata->sysclk == -1) {
|
|
pdata->sysclk = fsl_get_sys_freq();
|
|
if (pdata->sysclk == -1)
|
|
return -ENODEV;
|
|
}
|
|
#else
|
|
ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
|
|
if (ret)
|
|
return ret;
|
|
#endif
|
|
|
|
prop = of_get_property(np, "mode", NULL);
|
|
if (prop && !strcmp(prop, "cpu-qe"))
|
|
pdata->flags = SPI_QE_CPU_MODE;
|
|
else if (prop && !strcmp(prop, "qe"))
|
|
pdata->flags = SPI_CPM_MODE | SPI_QE;
|
|
else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
|
|
pdata->flags = SPI_CPM_MODE | SPI_CPM2;
|
|
else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
|
|
pdata->flags = SPI_CPM_MODE | SPI_CPM1;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);
|
|
|
|
MODULE_LICENSE("GPL");
|