1 /* 2 * Freescale SPI/eSPI controller driver library. 3 * 4 * Maintainer: Kumar Gala 5 * 6 * Copyright (C) 2006 Polycom, Inc. 7 * 8 * CPM SPI and QE buffer descriptors mode support: 9 * Copyright (c) 2009 MontaVista Software, Inc. 10 * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 11 * 12 * Copyright 2010 Freescale Semiconductor, Inc. 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License as published by the 16 * Free Software Foundation; either version 2 of the License, or (at your 17 * option) any later version. 18 */ 19 #include <linux/dma-mapping.h> 20 #include <linux/fsl_devices.h> 21 #include <linux/interrupt.h> 22 #include <linux/kernel.h> 23 #include <linux/mm.h> 24 #include <linux/module.h> 25 #include <linux/of_platform.h> 26 #include <linux/spi/spi.h> 27 #ifdef CONFIG_FSL_SOC 28 #include <sysdev/fsl_soc.h> 29 #endif 30 31 #include "spi-fsl-lib.h" 32 33 #define MPC8XXX_SPI_RX_BUF(type) \ 34 void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ 35 { \ 36 type *rx = mpc8xxx_spi->rx; \ 37 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ 38 mpc8xxx_spi->rx = rx; \ 39 } \ 40 EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type); 41 42 #define MPC8XXX_SPI_TX_BUF(type) \ 43 u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ 44 { \ 45 u32 data; \ 46 const type *tx = mpc8xxx_spi->tx; \ 47 if (!tx) \ 48 return 0; \ 49 data = *tx++ << mpc8xxx_spi->tx_shift; \ 50 mpc8xxx_spi->tx = tx; \ 51 return data; \ 52 } \ 53 EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type); 54 55 MPC8XXX_SPI_RX_BUF(u8) 56 MPC8XXX_SPI_RX_BUF(u16) 57 MPC8XXX_SPI_RX_BUF(u32) 58 MPC8XXX_SPI_TX_BUF(u8) 59 MPC8XXX_SPI_TX_BUF(u16) 60 MPC8XXX_SPI_TX_BUF(u32) 61 62 struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata) 63 { 64 return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); 65 } 66 EXPORT_SYMBOL_GPL(to_of_pinfo); 67 68 const char *mpc8xxx_spi_strmode(unsigned int flags) 69 { 70 if (flags & SPI_QE_CPU_MODE) { 71 return "QE CPU"; 72 } else if (flags & SPI_CPM_MODE) { 73 if (flags & SPI_QE) 74 return "QE"; 75 else if (flags & SPI_CPM2) 76 return "CPM2"; 77 else 78 return "CPM1"; 79 } 80 return "CPU"; 81 } 82 EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode); 83 84 void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, 85 unsigned int irq) 86 { 87 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 88 struct spi_master *master; 89 struct mpc8xxx_spi *mpc8xxx_spi; 90 91 master = dev_get_drvdata(dev); 92 93 /* the spi->mode bits understood by this driver: */ 94 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH 95 | SPI_LSB_FIRST | SPI_LOOP; 96 97 master->dev.of_node = dev->of_node; 98 99 mpc8xxx_spi = spi_master_get_devdata(master); 100 mpc8xxx_spi->dev = dev; 101 mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; 102 mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; 103 mpc8xxx_spi->flags = pdata->flags; 104 mpc8xxx_spi->spibrg = pdata->sysclk; 105 mpc8xxx_spi->irq = irq; 106 107 mpc8xxx_spi->rx_shift = 0; 108 mpc8xxx_spi->tx_shift = 0; 109 110 master->bus_num = pdata->bus_num; 111 master->num_chipselect = pdata->max_chipselect; 112 113 init_completion(&mpc8xxx_spi->done); 114 } 115 EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe); 116 117 int of_mpc8xxx_spi_probe(struct platform_device *ofdev) 118 { 119 struct device *dev = &ofdev->dev; 120 struct device_node *np = ofdev->dev.of_node; 121 struct mpc8xxx_spi_probe_info *pinfo; 122 struct fsl_spi_platform_data *pdata; 123 const void *prop; 124 int ret = -ENOMEM; 125 126 pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL); 127 if (!pinfo) 128 return ret; 129 130 pdata = &pinfo->pdata; 131 dev->platform_data = pdata; 132 133 /* Allocate bus num dynamically. */ 134 pdata->bus_num = -1; 135 136 #ifdef CONFIG_FSL_SOC 137 /* SPI controller is either clocked from QE or SoC clock. */ 138 pdata->sysclk = get_brgfreq(); 139 if (pdata->sysclk == -1) { 140 pdata->sysclk = fsl_get_sys_freq(); 141 if (pdata->sysclk == -1) 142 return -ENODEV; 143 } 144 #else 145 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); 146 if (ret) 147 return ret; 148 #endif 149 150 prop = of_get_property(np, "mode", NULL); 151 if (prop && !strcmp(prop, "cpu-qe")) 152 pdata->flags = SPI_QE_CPU_MODE; 153 else if (prop && !strcmp(prop, "qe")) 154 pdata->flags = SPI_CPM_MODE | SPI_QE; 155 else if (of_device_is_compatible(np, "fsl,cpm2-spi")) 156 pdata->flags = SPI_CPM_MODE | SPI_CPM2; 157 else if (of_device_is_compatible(np, "fsl,cpm1-spi")) 158 pdata->flags = SPI_CPM_MODE | SPI_CPM1; 159 160 return 0; 161 } 162 EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe); 163 164 MODULE_LICENSE("GPL"); 165