1ca632f55SGrant Likely /* 2ca632f55SGrant Likely * Freescale SPI/eSPI controller driver library. 3ca632f55SGrant Likely * 4ca632f55SGrant Likely * Maintainer: Kumar Gala 5ca632f55SGrant Likely * 6ca632f55SGrant Likely * Copyright (C) 2006 Polycom, Inc. 7ca632f55SGrant Likely * 8ca632f55SGrant Likely * CPM SPI and QE buffer descriptors mode support: 9ca632f55SGrant Likely * Copyright (c) 2009 MontaVista Software, Inc. 10ca632f55SGrant Likely * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 11ca632f55SGrant Likely * 12ca632f55SGrant Likely * Copyright 2010 Freescale Semiconductor, Inc. 13ca632f55SGrant Likely * 14ca632f55SGrant Likely * This program is free software; you can redistribute it and/or modify it 15ca632f55SGrant Likely * under the terms of the GNU General Public License as published by the 16ca632f55SGrant Likely * Free Software Foundation; either version 2 of the License, or (at your 17ca632f55SGrant Likely * option) any later version. 18ca632f55SGrant Likely */ 19ca632f55SGrant Likely #include <linux/dma-mapping.h> 20a3108360SXiubo Li #include <linux/fsl_devices.h> 21a3108360SXiubo Li #include <linux/interrupt.h> 22a3108360SXiubo Li #include <linux/kernel.h> 23ca632f55SGrant Likely #include <linux/mm.h> 2438455d7aSEsben Haabendal #include <linux/module.h> 25ca632f55SGrant Likely #include <linux/of_platform.h> 26d57a4282SGrant Likely #include <linux/spi/spi.h> 27e8beacbbSAndreas Larsson #ifdef CONFIG_FSL_SOC 28ca632f55SGrant Likely #include <sysdev/fsl_soc.h> 29e8beacbbSAndreas Larsson #endif 30ca632f55SGrant Likely 31ca632f55SGrant Likely #include "spi-fsl-lib.h" 32ca632f55SGrant Likely 33ca632f55SGrant Likely #define MPC8XXX_SPI_RX_BUF(type) \ 34ca632f55SGrant Likely void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ 35ca632f55SGrant Likely { \ 36ca632f55SGrant Likely type *rx = mpc8xxx_spi->rx; \ 37ca632f55SGrant Likely *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ 38ca632f55SGrant Likely mpc8xxx_spi->rx = rx; \ 3938455d7aSEsben Haabendal } \ 4038455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type); 41ca632f55SGrant Likely 42ca632f55SGrant Likely #define MPC8XXX_SPI_TX_BUF(type) \ 43ca632f55SGrant Likely u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ 44ca632f55SGrant Likely { \ 45ca632f55SGrant Likely u32 data; \ 46ca632f55SGrant Likely const type *tx = mpc8xxx_spi->tx; \ 47ca632f55SGrant Likely if (!tx) \ 48ca632f55SGrant Likely return 0; \ 49ca632f55SGrant Likely data = *tx++ << mpc8xxx_spi->tx_shift; \ 50ca632f55SGrant Likely mpc8xxx_spi->tx = tx; \ 51ca632f55SGrant Likely return data; \ 5238455d7aSEsben Haabendal } \ 5338455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type); 54ca632f55SGrant Likely 55ca632f55SGrant Likely MPC8XXX_SPI_RX_BUF(u8) 56ca632f55SGrant Likely MPC8XXX_SPI_RX_BUF(u16) 57ca632f55SGrant Likely MPC8XXX_SPI_RX_BUF(u32) 58ca632f55SGrant Likely MPC8XXX_SPI_TX_BUF(u8) 59ca632f55SGrant Likely MPC8XXX_SPI_TX_BUF(u16) 60ca632f55SGrant Likely MPC8XXX_SPI_TX_BUF(u32) 61ca632f55SGrant Likely 62ca632f55SGrant Likely struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata) 63ca632f55SGrant Likely { 64ca632f55SGrant Likely return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); 65ca632f55SGrant Likely } 6638455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(to_of_pinfo); 67ca632f55SGrant Likely 68ca632f55SGrant Likely const char *mpc8xxx_spi_strmode(unsigned int flags) 69ca632f55SGrant Likely { 70ca632f55SGrant Likely if (flags & SPI_QE_CPU_MODE) { 71ca632f55SGrant Likely return "QE CPU"; 72ca632f55SGrant Likely } else if (flags & SPI_CPM_MODE) { 73ca632f55SGrant Likely if (flags & SPI_QE) 74ca632f55SGrant Likely return "QE"; 75ca632f55SGrant Likely else if (flags & SPI_CPM2) 76ca632f55SGrant Likely return "CPM2"; 77ca632f55SGrant Likely else 78ca632f55SGrant Likely return "CPM1"; 79ca632f55SGrant Likely } 80ca632f55SGrant Likely return "CPU"; 81ca632f55SGrant Likely } 8238455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode); 83ca632f55SGrant Likely 84c592becbSHeiner Kallweit void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, 85ca632f55SGrant Likely unsigned int irq) 86ca632f55SGrant Likely { 878074cf06SJingoo Han struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 88ca632f55SGrant Likely struct spi_master *master; 89ca632f55SGrant Likely struct mpc8xxx_spi *mpc8xxx_spi; 90ca632f55SGrant Likely 91ca632f55SGrant Likely master = dev_get_drvdata(dev); 92ca632f55SGrant Likely 93ca632f55SGrant Likely /* the spi->mode bits understood by this driver: */ 94ca632f55SGrant Likely master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH 95ca632f55SGrant Likely | SPI_LSB_FIRST | SPI_LOOP; 96ca632f55SGrant Likely 97ca632f55SGrant Likely master->dev.of_node = dev->of_node; 98ca632f55SGrant Likely 99ca632f55SGrant Likely mpc8xxx_spi = spi_master_get_devdata(master); 100ca632f55SGrant Likely mpc8xxx_spi->dev = dev; 101ca632f55SGrant Likely mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; 102ca632f55SGrant Likely mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; 103ca632f55SGrant Likely mpc8xxx_spi->flags = pdata->flags; 104ca632f55SGrant Likely mpc8xxx_spi->spibrg = pdata->sysclk; 105ca632f55SGrant Likely mpc8xxx_spi->irq = irq; 106ca632f55SGrant Likely 107ca632f55SGrant Likely mpc8xxx_spi->rx_shift = 0; 108ca632f55SGrant Likely mpc8xxx_spi->tx_shift = 0; 109ca632f55SGrant Likely 110ca632f55SGrant Likely master->bus_num = pdata->bus_num; 111ca632f55SGrant Likely master->num_chipselect = pdata->max_chipselect; 112ca632f55SGrant Likely 113ca632f55SGrant Likely init_completion(&mpc8xxx_spi->done); 114ca632f55SGrant Likely } 11538455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe); 116ca632f55SGrant Likely 117fd4a319bSGrant Likely int mpc8xxx_spi_remove(struct device *dev) 118ca632f55SGrant Likely { 119ca632f55SGrant Likely struct mpc8xxx_spi *mpc8xxx_spi; 120ca632f55SGrant Likely struct spi_master *master; 121ca632f55SGrant Likely 122ca632f55SGrant Likely master = dev_get_drvdata(dev); 123ca632f55SGrant Likely mpc8xxx_spi = spi_master_get_devdata(master); 124ca632f55SGrant Likely 125ca632f55SGrant Likely spi_unregister_master(master); 126ca632f55SGrant Likely 127ca632f55SGrant Likely free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); 128ca632f55SGrant Likely 129ca632f55SGrant Likely if (mpc8xxx_spi->spi_remove) 130ca632f55SGrant Likely mpc8xxx_spi->spi_remove(mpc8xxx_spi); 131ca632f55SGrant Likely 132ca632f55SGrant Likely return 0; 133ca632f55SGrant Likely } 13438455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(mpc8xxx_spi_remove); 135ca632f55SGrant Likely 136fd4a319bSGrant Likely int of_mpc8xxx_spi_probe(struct platform_device *ofdev) 137ca632f55SGrant Likely { 138ca632f55SGrant Likely struct device *dev = &ofdev->dev; 139ca632f55SGrant Likely struct device_node *np = ofdev->dev.of_node; 140ca632f55SGrant Likely struct mpc8xxx_spi_probe_info *pinfo; 141ca632f55SGrant Likely struct fsl_spi_platform_data *pdata; 142ca632f55SGrant Likely const void *prop; 143ca632f55SGrant Likely int ret = -ENOMEM; 144ca632f55SGrant Likely 1457282326bSAxel Lin pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL); 146ca632f55SGrant Likely if (!pinfo) 147ef4bbdecSZhao Qiang return ret; 148ca632f55SGrant Likely 149ca632f55SGrant Likely pdata = &pinfo->pdata; 150ca632f55SGrant Likely dev->platform_data = pdata; 151ca632f55SGrant Likely 152ca632f55SGrant Likely /* Allocate bus num dynamically. */ 153ca632f55SGrant Likely pdata->bus_num = -1; 154ca632f55SGrant Likely 155e8beacbbSAndreas Larsson #ifdef CONFIG_FSL_SOC 156ca632f55SGrant Likely /* SPI controller is either clocked from QE or SoC clock. */ 157ca632f55SGrant Likely pdata->sysclk = get_brgfreq(); 158ca632f55SGrant Likely if (pdata->sysclk == -1) { 159ca632f55SGrant Likely pdata->sysclk = fsl_get_sys_freq(); 1607282326bSAxel Lin if (pdata->sysclk == -1) 1617282326bSAxel Lin return -ENODEV; 162ca632f55SGrant Likely } 163e8beacbbSAndreas Larsson #else 164e8beacbbSAndreas Larsson ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); 165e8beacbbSAndreas Larsson if (ret) 1667282326bSAxel Lin return ret; 167e8beacbbSAndreas Larsson #endif 168ca632f55SGrant Likely 169ca632f55SGrant Likely prop = of_get_property(np, "mode", NULL); 170ca632f55SGrant Likely if (prop && !strcmp(prop, "cpu-qe")) 171ca632f55SGrant Likely pdata->flags = SPI_QE_CPU_MODE; 172ca632f55SGrant Likely else if (prop && !strcmp(prop, "qe")) 173ca632f55SGrant Likely pdata->flags = SPI_CPM_MODE | SPI_QE; 174ca632f55SGrant Likely else if (of_device_is_compatible(np, "fsl,cpm2-spi")) 175ca632f55SGrant Likely pdata->flags = SPI_CPM_MODE | SPI_CPM2; 176ca632f55SGrant Likely else if (of_device_is_compatible(np, "fsl,cpm1-spi")) 177ca632f55SGrant Likely pdata->flags = SPI_CPM_MODE | SPI_CPM1; 178ca632f55SGrant Likely 179ca632f55SGrant Likely return 0; 180ca632f55SGrant Likely } 18138455d7aSEsben Haabendal EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe); 18238455d7aSEsben Haabendal 18338455d7aSEsben Haabendal MODULE_LICENSE("GPL"); 184