1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Freescale SPI/eSPI controller driver library. 4 * 5 * Maintainer: Kumar Gala 6 * 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_platform.h> 22 #include <linux/spi/spi.h> 23 #ifdef CONFIG_FSL_SOC 24 #include <sysdev/fsl_soc.h> 25 #endif 26 27 #include "spi-fsl-lib.h" 28 29 #define MPC8XXX_SPI_RX_BUF(type) \ 30 void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ 31 { \ 32 type *rx = mpc8xxx_spi->rx; \ 33 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ 34 mpc8xxx_spi->rx = rx; \ 35 } \ 36 EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type); 37 38 #define MPC8XXX_SPI_TX_BUF(type) \ 39 u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ 40 { \ 41 u32 data; \ 42 const type *tx = mpc8xxx_spi->tx; \ 43 if (!tx) \ 44 return 0; \ 45 data = *tx++ << mpc8xxx_spi->tx_shift; \ 46 mpc8xxx_spi->tx = tx; \ 47 return data; \ 48 } \ 49 EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type); 50 51 MPC8XXX_SPI_RX_BUF(u8) 52 MPC8XXX_SPI_RX_BUF(u16) 53 MPC8XXX_SPI_RX_BUF(u32) 54 MPC8XXX_SPI_TX_BUF(u8) 55 MPC8XXX_SPI_TX_BUF(u16) 56 MPC8XXX_SPI_TX_BUF(u32) 57 58 struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata) 59 { 60 return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); 61 } 62 EXPORT_SYMBOL_GPL(to_of_pinfo); 63 64 const char *mpc8xxx_spi_strmode(unsigned int flags) 65 { 66 if (flags & SPI_QE_CPU_MODE) { 67 return "QE CPU"; 68 } else if (flags & SPI_CPM_MODE) { 69 if (flags & SPI_QE) 70 return "QE"; 71 else if (flags & SPI_CPM2) 72 return "CPM2"; 73 else 74 return "CPM1"; 75 } 76 return "CPU"; 77 } 78 EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode); 79 80 void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, 81 unsigned int irq) 82 { 83 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 84 struct spi_master *master; 85 struct mpc8xxx_spi *mpc8xxx_spi; 86 87 master = dev_get_drvdata(dev); 88 89 /* the spi->mode bits understood by this driver: */ 90 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH 91 | SPI_LSB_FIRST | SPI_LOOP; 92 93 master->dev.of_node = dev->of_node; 94 95 mpc8xxx_spi = spi_master_get_devdata(master); 96 mpc8xxx_spi->dev = dev; 97 mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; 98 mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; 99 mpc8xxx_spi->flags = pdata->flags; 100 mpc8xxx_spi->spibrg = pdata->sysclk; 101 mpc8xxx_spi->irq = irq; 102 103 mpc8xxx_spi->rx_shift = 0; 104 mpc8xxx_spi->tx_shift = 0; 105 106 master->bus_num = pdata->bus_num; 107 master->num_chipselect = pdata->max_chipselect; 108 109 init_completion(&mpc8xxx_spi->done); 110 } 111 EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe); 112 113 int of_mpc8xxx_spi_probe(struct platform_device *ofdev) 114 { 115 struct device *dev = &ofdev->dev; 116 struct device_node *np = ofdev->dev.of_node; 117 struct mpc8xxx_spi_probe_info *pinfo; 118 struct fsl_spi_platform_data *pdata; 119 const void *prop; 120 int ret = -ENOMEM; 121 122 pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL); 123 if (!pinfo) 124 return ret; 125 126 pdata = &pinfo->pdata; 127 dev->platform_data = pdata; 128 129 /* Allocate bus num dynamically. */ 130 pdata->bus_num = -1; 131 132 #ifdef CONFIG_FSL_SOC 133 /* SPI controller is either clocked from QE or SoC clock. */ 134 pdata->sysclk = get_brgfreq(); 135 if (pdata->sysclk == -1) { 136 pdata->sysclk = fsl_get_sys_freq(); 137 if (pdata->sysclk == -1) 138 return -ENODEV; 139 } 140 #else 141 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); 142 if (ret) 143 return ret; 144 #endif 145 146 prop = of_get_property(np, "mode", NULL); 147 if (prop && !strcmp(prop, "cpu-qe")) 148 pdata->flags = SPI_QE_CPU_MODE; 149 else if (prop && !strcmp(prop, "qe")) 150 pdata->flags = SPI_CPM_MODE | SPI_QE; 151 else if (of_device_is_compatible(np, "fsl,cpm2-spi")) 152 pdata->flags = SPI_CPM_MODE | SPI_CPM2; 153 else if (of_device_is_compatible(np, "fsl,cpm1-spi")) 154 pdata->flags = SPI_CPM_MODE | SPI_CPM1; 155 156 return 0; 157 } 158 EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe); 159 160 MODULE_LICENSE("GPL"); 161