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Mingkai Hub36ece82010-10-12 18:18:31 +08001/*
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 Hub36ece82010-10-12 18:18:31 +080019#include <linux/dma-mapping.h>
Xiubo Lia3108362014-09-29 10:57:06 +080020#include <linux/fsl_devices.h>
21#include <linux/interrupt.h>
22#include <linux/kernel.h>
Mingkai Hub36ece82010-10-12 18:18:31 +080023#include <linux/mm.h>
24#include <linux/of_platform.h>
Grant Likelyd57a4282012-04-07 14:16:53 -060025#include <linux/spi/spi.h>
Andreas Larssone8beacb2013-02-15 16:52:21 +010026#ifdef CONFIG_FSL_SOC
Mingkai Hub36ece82010-10-12 18:18:31 +080027#include <sysdev/fsl_soc.h>
Andreas Larssone8beacb2013-02-15 16:52:21 +010028#endif
Mingkai Hub36ece82010-10-12 18:18:31 +080029
Grant Likelyca632f52011-06-06 01:16:30 -060030#include "spi-fsl-lib.h"
Mingkai Hub36ece82010-10-12 18:18:31 +080031
32#define MPC8XXX_SPI_RX_BUF(type) \
33void 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) \
41u32 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
52MPC8XXX_SPI_RX_BUF(u8)
53MPC8XXX_SPI_RX_BUF(u16)
54MPC8XXX_SPI_RX_BUF(u32)
55MPC8XXX_SPI_TX_BUF(u8)
56MPC8XXX_SPI_TX_BUF(u16)
57MPC8XXX_SPI_TX_BUF(u32)
58
59struct 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 Hub36ece82010-10-12 18:18:31 +080064const 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 Kallweitc592bec2014-12-03 07:56:17 +010079void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
Mingkai Hub36ece82010-10-12 18:18:31 +080080 unsigned int irq)
81{
Jingoo Han8074cf02013-07-30 16:58:59 +090082 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
Mingkai Hub36ece82010-10-12 18:18:31 +080083 struct spi_master *master;
84 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +080085
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 Hub36ece82010-10-12 18:18:31 +080092 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 Hub36ece82010-10-12 18:18:31 +0800110 init_completion(&mpc8xxx_spi->done);
Mingkai Hub36ece82010-10-12 18:18:31 +0800111}
112
Grant Likelyfd4a3192012-12-07 16:57:14 +0000113int mpc8xxx_spi_remove(struct device *dev)
Mingkai Hub36ece82010-10-12 18:18:31 +0800114{
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 Hub36ece82010-10-12 18:18:31 +0800121 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 Likelyfd4a3192012-12-07 16:57:14 +0000131int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
Mingkai Hub36ece82010-10-12 18:18:31 +0800132{
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 Lin72823262014-03-20 17:20:17 +0800140 pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
Mingkai Hub36ece82010-10-12 18:18:31 +0800141 if (!pinfo)
Zhao Qiangef4bbde2014-06-26 11:26:43 +0800142 return ret;
Mingkai Hub36ece82010-10-12 18:18:31 +0800143
144 pdata = &pinfo->pdata;
145 dev->platform_data = pdata;
146
147 /* Allocate bus num dynamically. */
148 pdata->bus_num = -1;
149
Andreas Larssone8beacb2013-02-15 16:52:21 +0100150#ifdef CONFIG_FSL_SOC
Mingkai Hub36ece82010-10-12 18:18:31 +0800151 /* 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 Lin72823262014-03-20 17:20:17 +0800155 if (pdata->sysclk == -1)
156 return -ENODEV;
Mingkai Hub36ece82010-10-12 18:18:31 +0800157 }
Andreas Larssone8beacb2013-02-15 16:52:21 +0100158#else
159 ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
160 if (ret)
Axel Lin72823262014-03-20 17:20:17 +0800161 return ret;
Andreas Larssone8beacb2013-02-15 16:52:21 +0100162#endif
Mingkai Hub36ece82010-10-12 18:18:31 +0800163
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 Hub36ece82010-10-12 18:18:31 +0800175}