2 * Freescale SPI/eSPI controller driver library.
4 * Maintainer: Kumar Gala
6 * Copyright (C) 2006 Polycom, Inc.
8 * CPM SPI and QE buffer descriptors mode support:
9 * Copyright (c) 2009 MontaVista Software, Inc.
10 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
12 * Copyright 2010 Freescale Semiconductor, Inc.
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.
19 #include <linux/dma-mapping.h>
20 #include <linux/fsl_devices.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
24 #include <linux/of_platform.h>
25 #include <linux/spi/spi.h>
27 #include <sysdev/fsl_soc.h>
30 #include "spi-fsl-lib.h"
32 #define MPC8XXX_SPI_RX_BUF(type) \
33 void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
35 type *rx = mpc8xxx_spi->rx; \
36 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \
37 mpc8xxx_spi->rx = rx; \
40 #define MPC8XXX_SPI_TX_BUF(type) \
41 u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \
44 const type *tx = mpc8xxx_spi->tx; \
47 data = *tx++ << mpc8xxx_spi->tx_shift; \
48 mpc8xxx_spi->tx = tx; \
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)
59 struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
61 return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
64 const char *mpc8xxx_spi_strmode(unsigned int flags)
66 if (flags & SPI_QE_CPU_MODE) {
68 } else if (flags & SPI_CPM_MODE) {
71 else if (flags & SPI_CPM2)
79 void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
82 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
83 struct spi_master *master;
84 struct mpc8xxx_spi *mpc8xxx_spi;
86 master = dev_get_drvdata(dev);
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;
92 master->dev.of_node = dev->of_node;
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;
102 mpc8xxx_spi->rx_shift = 0;
103 mpc8xxx_spi->tx_shift = 0;
105 init_completion(&mpc8xxx_spi->done);
107 master->bus_num = pdata->bus_num;
108 master->num_chipselect = pdata->max_chipselect;
110 init_completion(&mpc8xxx_spi->done);
113 int mpc8xxx_spi_remove(struct device *dev)
115 struct mpc8xxx_spi *mpc8xxx_spi;
116 struct spi_master *master;
118 master = dev_get_drvdata(dev);
119 mpc8xxx_spi = spi_master_get_devdata(master);
121 spi_unregister_master(master);
123 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
125 if (mpc8xxx_spi->spi_remove)
126 mpc8xxx_spi->spi_remove(mpc8xxx_spi);
131 int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
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;
140 pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
144 pdata = &pinfo->pdata;
145 dev->platform_data = pdata;
147 /* Allocate bus num dynamically. */
150 #ifdef CONFIG_FSL_SOC
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();
155 if (pdata->sysclk == -1)
159 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
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;