gpu: nvgpu: Increase PBDMA timeout
[linux-3.10.git] / drivers / spi / spi-fsl-lib.c
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 #ifdef CONFIG_FSL_SOC
27 #include <sysdev/fsl_soc.h>
28 #endif
29
30 #include "spi-fsl-lib.h"
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
64 void mpc8xxx_spi_work(struct work_struct *work)
65 {
66         struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi,
67                                                        work);
68
69         spin_lock_irq(&mpc8xxx_spi->lock);
70         while (!list_empty(&mpc8xxx_spi->queue)) {
71                 struct spi_message *m = container_of(mpc8xxx_spi->queue.next,
72                                                    struct spi_message, queue);
73
74                 list_del_init(&m->queue);
75                 spin_unlock_irq(&mpc8xxx_spi->lock);
76
77                 if (mpc8xxx_spi->spi_do_one_msg)
78                         mpc8xxx_spi->spi_do_one_msg(m);
79
80                 spin_lock_irq(&mpc8xxx_spi->lock);
81         }
82         spin_unlock_irq(&mpc8xxx_spi->lock);
83 }
84
85 int mpc8xxx_spi_transfer(struct spi_device *spi,
86                                 struct spi_message *m)
87 {
88         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
89         unsigned long flags;
90
91         m->actual_length = 0;
92         m->status = -EINPROGRESS;
93
94         spin_lock_irqsave(&mpc8xxx_spi->lock, flags);
95         list_add_tail(&m->queue, &mpc8xxx_spi->queue);
96         queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work);
97         spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags);
98
99         return 0;
100 }
101
102 void mpc8xxx_spi_cleanup(struct spi_device *spi)
103 {
104         kfree(spi->controller_state);
105 }
106
107 const char *mpc8xxx_spi_strmode(unsigned int flags)
108 {
109         if (flags & SPI_QE_CPU_MODE) {
110                 return "QE CPU";
111         } else if (flags & SPI_CPM_MODE) {
112                 if (flags & SPI_QE)
113                         return "QE";
114                 else if (flags & SPI_CPM2)
115                         return "CPM2";
116                 else
117                         return "CPM1";
118         }
119         return "CPU";
120 }
121
122 int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
123                         unsigned int irq)
124 {
125         struct fsl_spi_platform_data *pdata = dev->platform_data;
126         struct spi_master *master;
127         struct mpc8xxx_spi *mpc8xxx_spi;
128         int ret = 0;
129
130         master = dev_get_drvdata(dev);
131
132         /* the spi->mode bits understood by this driver: */
133         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
134                         | SPI_LSB_FIRST | SPI_LOOP;
135
136         master->transfer = mpc8xxx_spi_transfer;
137         master->cleanup = mpc8xxx_spi_cleanup;
138         master->dev.of_node = dev->of_node;
139
140         mpc8xxx_spi = spi_master_get_devdata(master);
141         mpc8xxx_spi->dev = dev;
142         mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
143         mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
144         mpc8xxx_spi->flags = pdata->flags;
145         mpc8xxx_spi->spibrg = pdata->sysclk;
146         mpc8xxx_spi->irq = irq;
147
148         mpc8xxx_spi->rx_shift = 0;
149         mpc8xxx_spi->tx_shift = 0;
150
151         init_completion(&mpc8xxx_spi->done);
152
153         master->bus_num = pdata->bus_num;
154         master->num_chipselect = pdata->max_chipselect;
155
156         spin_lock_init(&mpc8xxx_spi->lock);
157         init_completion(&mpc8xxx_spi->done);
158         INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work);
159         INIT_LIST_HEAD(&mpc8xxx_spi->queue);
160
161         mpc8xxx_spi->workqueue = create_singlethread_workqueue(
162                 dev_name(master->dev.parent));
163         if (mpc8xxx_spi->workqueue == NULL) {
164                 ret = -EBUSY;
165                 goto err;
166         }
167
168         return 0;
169
170 err:
171         return ret;
172 }
173
174 int mpc8xxx_spi_remove(struct device *dev)
175 {
176         struct mpc8xxx_spi *mpc8xxx_spi;
177         struct spi_master *master;
178
179         master = dev_get_drvdata(dev);
180         mpc8xxx_spi = spi_master_get_devdata(master);
181
182         flush_workqueue(mpc8xxx_spi->workqueue);
183         destroy_workqueue(mpc8xxx_spi->workqueue);
184         spi_unregister_master(master);
185
186         free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
187
188         if (mpc8xxx_spi->spi_remove)
189                 mpc8xxx_spi->spi_remove(mpc8xxx_spi);
190
191         return 0;
192 }
193
194 int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
195 {
196         struct device *dev = &ofdev->dev;
197         struct device_node *np = ofdev->dev.of_node;
198         struct mpc8xxx_spi_probe_info *pinfo;
199         struct fsl_spi_platform_data *pdata;
200         const void *prop;
201         int ret = -ENOMEM;
202
203         pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
204         if (!pinfo)
205                 return -ENOMEM;
206
207         pdata = &pinfo->pdata;
208         dev->platform_data = pdata;
209
210         /* Allocate bus num dynamically. */
211         pdata->bus_num = -1;
212
213 #ifdef CONFIG_FSL_SOC
214         /* SPI controller is either clocked from QE or SoC clock. */
215         pdata->sysclk = get_brgfreq();
216         if (pdata->sysclk == -1) {
217                 pdata->sysclk = fsl_get_sys_freq();
218                 if (pdata->sysclk == -1) {
219                         ret = -ENODEV;
220                         goto err;
221                 }
222         }
223 #else
224         ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
225         if (ret)
226                 goto err;
227 #endif
228
229         prop = of_get_property(np, "mode", NULL);
230         if (prop && !strcmp(prop, "cpu-qe"))
231                 pdata->flags = SPI_QE_CPU_MODE;
232         else if (prop && !strcmp(prop, "qe"))
233                 pdata->flags = SPI_CPM_MODE | SPI_QE;
234         else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
235                 pdata->flags = SPI_CPM_MODE | SPI_CPM2;
236         else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
237                 pdata->flags = SPI_CPM_MODE | SPI_CPM1;
238
239         return 0;
240
241 err:
242         kfree(pinfo);
243         return ret;
244 }