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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/kernel.h>
20#include <linux/interrupt.h>
21#include <linux/fsl_devices.h>
22#include <linux/dma-mapping.h>
23#include <linux/mm.h>
24#include <linux/of_platform.h>
25#include <linux/spi/spi.h>
26#include <sysdev/fsl_soc.h>
27
28#include "spi-fsl-lib.h"
29
30#define MPC8XXX_SPI_RX_BUF(type) \
31void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
32{ \
33 type *rx = mpc8xxx_spi->rx; \
34 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \
35 mpc8xxx_spi->rx = rx; \
36}
37
38#define MPC8XXX_SPI_TX_BUF(type) \
39u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \
40{ \
41 u32 data; \
42 const type *tx = mpc8xxx_spi->tx; \
43 if (!tx) \
44 return 0; \
45 data = *tx++ << mpc8xxx_spi->tx_shift; \
46 mpc8xxx_spi->tx = tx; \
47 return data; \
48}
49
50MPC8XXX_SPI_RX_BUF(u8)
51MPC8XXX_SPI_RX_BUF(u16)
52MPC8XXX_SPI_RX_BUF(u32)
53MPC8XXX_SPI_TX_BUF(u8)
54MPC8XXX_SPI_TX_BUF(u16)
55MPC8XXX_SPI_TX_BUF(u32)
56
57struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
58{
59 return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
60}
61
62void mpc8xxx_spi_work(struct work_struct *work)
63{
64 struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi,
65 work);
66
67 spin_lock_irq(&mpc8xxx_spi->lock);
68 while (!list_empty(&mpc8xxx_spi->queue)) {
69 struct spi_message *m = container_of(mpc8xxx_spi->queue.next,
70 struct spi_message, queue);
71
72 list_del_init(&m->queue);
73 spin_unlock_irq(&mpc8xxx_spi->lock);
74
75 if (mpc8xxx_spi->spi_do_one_msg)
76 mpc8xxx_spi->spi_do_one_msg(m);
77
78 spin_lock_irq(&mpc8xxx_spi->lock);
79 }
80 spin_unlock_irq(&mpc8xxx_spi->lock);
81}
82
83int mpc8xxx_spi_transfer(struct spi_device *spi,
84 struct spi_message *m)
85{
86 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
87 unsigned long flags;
88
89 m->actual_length = 0;
90 m->status = -EINPROGRESS;
91
92 spin_lock_irqsave(&mpc8xxx_spi->lock, flags);
93 list_add_tail(&m->queue, &mpc8xxx_spi->queue);
94 queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work);
95 spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags);
96
97 return 0;
98}
99
100void mpc8xxx_spi_cleanup(struct spi_device *spi)
101{
102 kfree(spi->controller_state);
103}
104
105const char *mpc8xxx_spi_strmode(unsigned int flags)
106{
107 if (flags & SPI_QE_CPU_MODE) {
108 return "QE CPU";
109 } else if (flags & SPI_CPM_MODE) {
110 if (flags & SPI_QE)
111 return "QE";
112 else if (flags & SPI_CPM2)
113 return "CPM2";
114 else
115 return "CPM1";
116 }
117 return "CPU";
118}
119
120int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
121 unsigned int irq)
122{
123 struct fsl_spi_platform_data *pdata = dev->platform_data;
124 struct spi_master *master;
125 struct mpc8xxx_spi *mpc8xxx_spi;
126 int ret = 0;
127
128 master = dev_get_drvdata(dev);
129
130 /* the spi->mode bits understood by this driver: */
131 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
132 | SPI_LSB_FIRST | SPI_LOOP;
133
134 master->transfer = mpc8xxx_spi_transfer;
135 master->cleanup = mpc8xxx_spi_cleanup;
136 master->dev.of_node = dev->of_node;
137
138 mpc8xxx_spi = spi_master_get_devdata(master);
139 mpc8xxx_spi->dev = dev;
140 mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
141 mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
142 mpc8xxx_spi->flags = pdata->flags;
143 mpc8xxx_spi->spibrg = pdata->sysclk;
144 mpc8xxx_spi->irq = irq;
145
146 mpc8xxx_spi->rx_shift = 0;
147 mpc8xxx_spi->tx_shift = 0;
148
149 init_completion(&mpc8xxx_spi->done);
150
151 master->bus_num = pdata->bus_num;
152 master->num_chipselect = pdata->max_chipselect;
153
154 spin_lock_init(&mpc8xxx_spi->lock);
155 init_completion(&mpc8xxx_spi->done);
156 INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work);
157 INIT_LIST_HEAD(&mpc8xxx_spi->queue);
158
159 mpc8xxx_spi->workqueue = create_singlethread_workqueue(
160 dev_name(master->dev.parent));
161 if (mpc8xxx_spi->workqueue == NULL) {
162 ret = -EBUSY;
163 goto err;
164 }
165
166 return 0;
167
168err:
169 return ret;
170}
171
172int __devexit mpc8xxx_spi_remove(struct device *dev)
173{
174 struct mpc8xxx_spi *mpc8xxx_spi;
175 struct spi_master *master;
176
177 master = dev_get_drvdata(dev);
178 mpc8xxx_spi = spi_master_get_devdata(master);
179
180 flush_workqueue(mpc8xxx_spi->workqueue);
181 destroy_workqueue(mpc8xxx_spi->workqueue);
182 spi_unregister_master(master);
183
184 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
185
186 if (mpc8xxx_spi->spi_remove)
187 mpc8xxx_spi->spi_remove(mpc8xxx_spi);
188
189 return 0;
190}
191
192int __devinit of_mpc8xxx_spi_probe(struct platform_device *ofdev)
193{
194 struct device *dev = &ofdev->dev;
195 struct device_node *np = ofdev->dev.of_node;
196 struct mpc8xxx_spi_probe_info *pinfo;
197 struct fsl_spi_platform_data *pdata;
198 const void *prop;
199 int ret = -ENOMEM;
200
201 pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
202 if (!pinfo)
203 return -ENOMEM;
204
205 pdata = &pinfo->pdata;
206 dev->platform_data = pdata;
207
208 /* Allocate bus num dynamically. */
209 pdata->bus_num = -1;
210
211 /* SPI controller is either clocked from QE or SoC clock. */
212 pdata->sysclk = get_brgfreq();
213 if (pdata->sysclk == -1) {
214 pdata->sysclk = fsl_get_sys_freq();
215 if (pdata->sysclk == -1) {
216 ret = -ENODEV;
217 goto err;
218 }
219 }
220
221 prop = of_get_property(np, "mode", NULL);
222 if (prop && !strcmp(prop, "cpu-qe"))
223 pdata->flags = SPI_QE_CPU_MODE;
224 else if (prop && !strcmp(prop, "qe"))
225 pdata->flags = SPI_CPM_MODE | SPI_QE;
226 else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
227 pdata->flags = SPI_CPM_MODE | SPI_CPM2;
228 else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
229 pdata->flags = SPI_CPM_MODE | SPI_CPM1;
230
231 return 0;
232
233err:
234 kfree(pinfo);
235 return ret;
236}