Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 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 | */ |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 19 | #include <linux/dma-mapping.h> |
Xiubo Li | a310836 | 2014-09-29 10:57:06 +0800 | [diff] [blame] | 20 | #include <linux/fsl_devices.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/kernel.h> |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 23 | #include <linux/mm.h> |
| 24 | #include <linux/of_platform.h> |
Grant Likely | d57a428 | 2012-04-07 14:16:53 -0600 | [diff] [blame] | 25 | #include <linux/spi/spi.h> |
Andreas Larsson | e8beacb | 2013-02-15 16:52:21 +0100 | [diff] [blame] | 26 | #ifdef CONFIG_FSL_SOC |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 27 | #include <sysdev/fsl_soc.h> |
Andreas Larsson | e8beacb | 2013-02-15 16:52:21 +0100 | [diff] [blame] | 28 | #endif |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 29 | |
Grant Likely | ca632f5 | 2011-06-06 01:16:30 -0600 | [diff] [blame] | 30 | #include "spi-fsl-lib.h" |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 31 | |
| 32 | #define MPC8XXX_SPI_RX_BUF(type) \ |
| 33 | void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ |
| 34 | { \ |
| 35 | type *rx = mpc8xxx_spi->rx; \ |
| 36 | *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ |
| 37 | mpc8xxx_spi->rx = rx; \ |
| 38 | } |
| 39 | |
| 40 | #define MPC8XXX_SPI_TX_BUF(type) \ |
| 41 | u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ |
| 42 | { \ |
| 43 | u32 data; \ |
| 44 | const type *tx = mpc8xxx_spi->tx; \ |
| 45 | if (!tx) \ |
| 46 | return 0; \ |
| 47 | data = *tx++ << mpc8xxx_spi->tx_shift; \ |
| 48 | mpc8xxx_spi->tx = tx; \ |
| 49 | return data; \ |
| 50 | } |
| 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 | |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 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 | |
Heiner Kallweit | c592bec | 2014-12-03 07:56:17 +0100 | [diff] [blame] | 79 | void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 80 | unsigned int irq) |
| 81 | { |
Jingoo Han | 8074cf0 | 2013-07-30 16:58:59 +0900 | [diff] [blame] | 82 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 83 | struct spi_master *master; |
| 84 | struct mpc8xxx_spi *mpc8xxx_spi; |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 85 | |
| 86 | master = dev_get_drvdata(dev); |
| 87 | |
| 88 | /* the spi->mode bits understood by this driver: */ |
| 89 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
| 90 | | SPI_LSB_FIRST | SPI_LOOP; |
| 91 | |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 92 | master->dev.of_node = dev->of_node; |
| 93 | |
| 94 | mpc8xxx_spi = spi_master_get_devdata(master); |
| 95 | mpc8xxx_spi->dev = dev; |
| 96 | mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; |
| 97 | mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; |
| 98 | mpc8xxx_spi->flags = pdata->flags; |
| 99 | mpc8xxx_spi->spibrg = pdata->sysclk; |
| 100 | mpc8xxx_spi->irq = irq; |
| 101 | |
| 102 | mpc8xxx_spi->rx_shift = 0; |
| 103 | mpc8xxx_spi->tx_shift = 0; |
| 104 | |
| 105 | init_completion(&mpc8xxx_spi->done); |
| 106 | |
| 107 | master->bus_num = pdata->bus_num; |
| 108 | master->num_chipselect = pdata->max_chipselect; |
| 109 | |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 110 | init_completion(&mpc8xxx_spi->done); |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 111 | } |
| 112 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 113 | int mpc8xxx_spi_remove(struct device *dev) |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 114 | { |
| 115 | struct mpc8xxx_spi *mpc8xxx_spi; |
| 116 | struct spi_master *master; |
| 117 | |
| 118 | master = dev_get_drvdata(dev); |
| 119 | mpc8xxx_spi = spi_master_get_devdata(master); |
| 120 | |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 121 | spi_unregister_master(master); |
| 122 | |
| 123 | free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); |
| 124 | |
| 125 | if (mpc8xxx_spi->spi_remove) |
| 126 | mpc8xxx_spi->spi_remove(mpc8xxx_spi); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 131 | int of_mpc8xxx_spi_probe(struct platform_device *ofdev) |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 132 | { |
| 133 | struct device *dev = &ofdev->dev; |
| 134 | struct device_node *np = ofdev->dev.of_node; |
| 135 | struct mpc8xxx_spi_probe_info *pinfo; |
| 136 | struct fsl_spi_platform_data *pdata; |
| 137 | const void *prop; |
| 138 | int ret = -ENOMEM; |
| 139 | |
Axel Lin | 7282326 | 2014-03-20 17:20:17 +0800 | [diff] [blame] | 140 | pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL); |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 141 | if (!pinfo) |
Zhao Qiang | ef4bbde | 2014-06-26 11:26:43 +0800 | [diff] [blame] | 142 | return ret; |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 143 | |
| 144 | pdata = &pinfo->pdata; |
| 145 | dev->platform_data = pdata; |
| 146 | |
| 147 | /* Allocate bus num dynamically. */ |
| 148 | pdata->bus_num = -1; |
| 149 | |
Andreas Larsson | e8beacb | 2013-02-15 16:52:21 +0100 | [diff] [blame] | 150 | #ifdef CONFIG_FSL_SOC |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 151 | /* SPI controller is either clocked from QE or SoC clock. */ |
| 152 | pdata->sysclk = get_brgfreq(); |
| 153 | if (pdata->sysclk == -1) { |
| 154 | pdata->sysclk = fsl_get_sys_freq(); |
Axel Lin | 7282326 | 2014-03-20 17:20:17 +0800 | [diff] [blame] | 155 | if (pdata->sysclk == -1) |
| 156 | return -ENODEV; |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 157 | } |
Andreas Larsson | e8beacb | 2013-02-15 16:52:21 +0100 | [diff] [blame] | 158 | #else |
| 159 | ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); |
| 160 | if (ret) |
Axel Lin | 7282326 | 2014-03-20 17:20:17 +0800 | [diff] [blame] | 161 | return ret; |
Andreas Larsson | e8beacb | 2013-02-15 16:52:21 +0100 | [diff] [blame] | 162 | #endif |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 163 | |
| 164 | prop = of_get_property(np, "mode", NULL); |
| 165 | if (prop && !strcmp(prop, "cpu-qe")) |
| 166 | pdata->flags = SPI_QE_CPU_MODE; |
| 167 | else if (prop && !strcmp(prop, "qe")) |
| 168 | pdata->flags = SPI_CPM_MODE | SPI_QE; |
| 169 | else if (of_device_is_compatible(np, "fsl,cpm2-spi")) |
| 170 | pdata->flags = SPI_CPM_MODE | SPI_CPM2; |
| 171 | else if (of_device_is_compatible(np, "fsl,cpm1-spi")) |
| 172 | pdata->flags = SPI_CPM_MODE | SPI_CPM1; |
| 173 | |
| 174 | return 0; |
Mingkai Hu | b36ece8 | 2010-10-12 18:18:31 +0800 | [diff] [blame] | 175 | } |