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.h> 22 #include <linux/platform_device.h> 23 #include <linux/spi/spi.h> 24 #ifdef CONFIG_FSL_SOC 25 #include <sysdev/fsl_soc.h> 26 #endif 27 28 #include "spi-fsl-lib.h" 29 30 #define MPC8XXX_SPI_RX_BUF(type) \ 31 void 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 } \ 37 EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type); 38 39 #define MPC8XXX_SPI_TX_BUF(type) \ 40 u32 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 } \ 50 EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type); 51 52 MPC8XXX_SPI_RX_BUF(u8) 53 MPC8XXX_SPI_RX_BUF(u16) 54 MPC8XXX_SPI_RX_BUF(u32) 55 MPC8XXX_SPI_TX_BUF(u8) 56 MPC8XXX_SPI_TX_BUF(u16) 57 MPC8XXX_SPI_TX_BUF(u32) 58 59 struct 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 } 63 EXPORT_SYMBOL_GPL(to_of_pinfo); 64 65 const 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 else 75 return "CPM1"; 76 } 77 return "CPU"; 78 } 79 EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode); 80 81 void 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_master *master; 86 struct mpc8xxx_spi *mpc8xxx_spi; 87 88 master = dev_get_drvdata(dev); 89 90 /* the spi->mode bits understood by this driver: */ 91 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH 92 | SPI_LSB_FIRST | SPI_LOOP; 93 94 master->dev.of_node = dev->of_node; 95 96 mpc8xxx_spi = spi_master_get_devdata(master); 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 master->bus_num = pdata->bus_num; 108 master->num_chipselect = pdata->max_chipselect; 109 110 init_completion(&mpc8xxx_spi->done); 111 } 112 EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe); 113 114 int 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_SOC 134 /* 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 #else 142 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); 143 if (ret) 144 return ret; 145 #endif 146 147 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 } 159 EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe); 160 161 MODULE_LICENSE("GPL"); 162