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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Freescale SPI/eSPI controller driver library.4 *5 * Maintainer: Kumar Gala6 *7 * Copyright (C) 2006 Polycom, Inc.8 *9 * CPM SPI and QE buffer descriptors mode support:10 * Copyright (c) 2009 MontaVista Software, Inc.11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>12 *13 * Copyright 2010 Freescale Semiconductor, Inc.14 */15#include <linux/dma-mapping.h>16#include <linux/fsl_devices.h>17#include <linux/interrupt.h>18#include <linux/kernel.h>19#include <linux/mm.h>20#include <linux/module.h>21#include <linux/of.h>22#include <linux/platform_device.h>23#include <linux/spi/spi.h>24#ifdef CONFIG_FSL_SOC25#include <sysdev/fsl_soc.h>26#endif27 28#include "spi-fsl-lib.h"29 30#define MPC8XXX_SPI_RX_BUF(type) \31void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \32{ \33 type *rx = mpc8xxx_spi->rx; \34 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \35 mpc8xxx_spi->rx = rx; \36} \37EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);38 39#define MPC8XXX_SPI_TX_BUF(type) \40u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \41{ \42 u32 data; \43 const type *tx = mpc8xxx_spi->tx; \44 if (!tx) \45 return 0; \46 data = *tx++ << mpc8xxx_spi->tx_shift; \47 mpc8xxx_spi->tx = tx; \48 return data; \49} \50EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);51 52MPC8XXX_SPI_RX_BUF(u8)53MPC8XXX_SPI_RX_BUF(u16)54MPC8XXX_SPI_RX_BUF(u32)55MPC8XXX_SPI_TX_BUF(u8)56MPC8XXX_SPI_TX_BUF(u16)57MPC8XXX_SPI_TX_BUF(u32)58 59struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)60{61 return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);62}63EXPORT_SYMBOL_GPL(to_of_pinfo);64 65const char *mpc8xxx_spi_strmode(unsigned int flags)66{67 if (flags & SPI_QE_CPU_MODE) {68 return "QE CPU";69 } else if (flags & SPI_CPM_MODE) {70 if (flags & SPI_QE)71 return "QE";72 else if (flags & SPI_CPM2)73 return "CPM2";74 else75 return "CPM1";76 }77 return "CPU";78}79EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);80 81void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,82 unsigned int irq)83{84 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);85 struct spi_controller *ctlr;86 struct mpc8xxx_spi *mpc8xxx_spi;87 88 ctlr = dev_get_drvdata(dev);89 90 /* the spi->mode bits understood by this driver: */91 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH92 | SPI_LSB_FIRST | SPI_LOOP;93 94 ctlr->dev.of_node = dev->of_node;95 96 mpc8xxx_spi = spi_controller_get_devdata(ctlr);97 mpc8xxx_spi->dev = dev;98 mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;99 mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;100 mpc8xxx_spi->flags = pdata->flags;101 mpc8xxx_spi->spibrg = pdata->sysclk;102 mpc8xxx_spi->irq = irq;103 104 mpc8xxx_spi->rx_shift = 0;105 mpc8xxx_spi->tx_shift = 0;106 107 ctlr->bus_num = pdata->bus_num;108 ctlr->num_chipselect = pdata->max_chipselect;109 110 init_completion(&mpc8xxx_spi->done);111}112EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);113 114int of_mpc8xxx_spi_probe(struct platform_device *ofdev)115{116 struct device *dev = &ofdev->dev;117 struct device_node *np = ofdev->dev.of_node;118 struct mpc8xxx_spi_probe_info *pinfo;119 struct fsl_spi_platform_data *pdata;120 const void *prop;121 int ret = -ENOMEM;122 123 pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);124 if (!pinfo)125 return ret;126 127 pdata = &pinfo->pdata;128 dev->platform_data = pdata;129 130 /* Allocate bus num dynamically. */131 pdata->bus_num = -1;132 133#ifdef CONFIG_FSL_SOC134 /* SPI controller is either clocked from QE or SoC clock. */135 pdata->sysclk = get_brgfreq();136 if (pdata->sysclk == -1) {137 pdata->sysclk = fsl_get_sys_freq();138 if (pdata->sysclk == -1)139 return -ENODEV;140 }141#else142 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);143 if (ret)144 return ret;145#endif146 147 prop = of_get_property(np, "mode", NULL);148 if (prop && !strcmp(prop, "cpu-qe"))149 pdata->flags = SPI_QE_CPU_MODE;150 else if (prop && !strcmp(prop, "qe"))151 pdata->flags = SPI_CPM_MODE | SPI_QE;152 else if (of_device_is_compatible(np, "fsl,cpm2-spi"))153 pdata->flags = SPI_CPM_MODE | SPI_CPM2;154 else if (of_device_is_compatible(np, "fsl,cpm1-spi"))155 pdata->flags = SPI_CPM_MODE | SPI_CPM1;156 157 return 0;158}159EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);160 161MODULE_DESCRIPTION("Freescale SPI/eSPI controller driver library");162MODULE_LICENSE("GPL");163