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/kernel.h>
20 #include <linux/interrupt.h>
21 #include <linux/fsl_devices.h>
22 #include <linux/dma-mapping.h>
24 #include <linux/of_platform.h>
25 #include <linux/of_spi.h>
26 #include <sysdev/fsl_soc.h>
28 #include "spi_fsl_lib.h"
30 #define MPC8XXX_SPI_RX_BUF(type) \
31 void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
33 type *rx = mpc8xxx_spi->rx; \
34 *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \
35 mpc8xxx_spi->rx = rx; \
38 #define MPC8XXX_SPI_TX_BUF(type) \
39 u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \
42 const type *tx = mpc8xxx_spi->tx; \
45 data = *tx++ << mpc8xxx_spi->tx_shift; \
46 mpc8xxx_spi->tx = tx; \
50 MPC8XXX_SPI_RX_BUF(u8
)
51 MPC8XXX_SPI_RX_BUF(u16
)
52 MPC8XXX_SPI_RX_BUF(u32
)
53 MPC8XXX_SPI_TX_BUF(u8
)
54 MPC8XXX_SPI_TX_BUF(u16
)
55 MPC8XXX_SPI_TX_BUF(u32
)
57 struct mpc8xxx_spi_probe_info
*to_of_pinfo(struct fsl_spi_platform_data
*pdata
)
59 return container_of(pdata
, struct mpc8xxx_spi_probe_info
, pdata
);
62 void mpc8xxx_spi_work(struct work_struct
*work
)
64 struct mpc8xxx_spi
*mpc8xxx_spi
= container_of(work
, struct mpc8xxx_spi
,
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
);
72 list_del_init(&m
->queue
);
73 spin_unlock_irq(&mpc8xxx_spi
->lock
);
75 if (mpc8xxx_spi
->spi_do_one_msg
)
76 mpc8xxx_spi
->spi_do_one_msg(m
);
78 spin_lock_irq(&mpc8xxx_spi
->lock
);
80 spin_unlock_irq(&mpc8xxx_spi
->lock
);
83 int mpc8xxx_spi_transfer(struct spi_device
*spi
,
84 struct spi_message
*m
)
86 struct mpc8xxx_spi
*mpc8xxx_spi
= spi_master_get_devdata(spi
->master
);
90 m
->status
= -EINPROGRESS
;
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
);
100 void mpc8xxx_spi_cleanup(struct spi_device
*spi
)
102 kfree(spi
->controller_state
);
105 const char *mpc8xxx_spi_strmode(unsigned int flags
)
107 if (flags
& SPI_QE_CPU_MODE
) {
109 } else if (flags
& SPI_CPM_MODE
) {
112 else if (flags
& SPI_CPM2
)
120 int mpc8xxx_spi_probe(struct device
*dev
, struct resource
*mem
,
123 struct fsl_spi_platform_data
*pdata
= dev
->platform_data
;
124 struct spi_master
*master
;
125 struct mpc8xxx_spi
*mpc8xxx_spi
;
128 master
= dev_get_drvdata(dev
);
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
;
134 master
->transfer
= mpc8xxx_spi_transfer
;
135 master
->cleanup
= mpc8xxx_spi_cleanup
;
136 master
->dev
.of_node
= dev
->of_node
;
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
;
146 mpc8xxx_spi
->rx_shift
= 0;
147 mpc8xxx_spi
->tx_shift
= 0;
149 init_completion(&mpc8xxx_spi
->done
);
151 master
->bus_num
= pdata
->bus_num
;
152 master
->num_chipselect
= pdata
->max_chipselect
;
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
);
159 mpc8xxx_spi
->workqueue
= create_singlethread_workqueue(
160 dev_name(master
->dev
.parent
));
161 if (mpc8xxx_spi
->workqueue
== NULL
) {
172 int __devexit
mpc8xxx_spi_remove(struct device
*dev
)
174 struct mpc8xxx_spi
*mpc8xxx_spi
;
175 struct spi_master
*master
;
177 master
= dev_get_drvdata(dev
);
178 mpc8xxx_spi
= spi_master_get_devdata(master
);
180 flush_workqueue(mpc8xxx_spi
->workqueue
);
181 destroy_workqueue(mpc8xxx_spi
->workqueue
);
182 spi_unregister_master(master
);
184 free_irq(mpc8xxx_spi
->irq
, mpc8xxx_spi
);
186 if (mpc8xxx_spi
->spi_remove
)
187 mpc8xxx_spi
->spi_remove(mpc8xxx_spi
);
192 int __devinit
of_mpc8xxx_spi_probe(struct platform_device
*ofdev
,
193 const struct of_device_id
*ofid
)
195 struct device
*dev
= &ofdev
->dev
;
196 struct device_node
*np
= ofdev
->dev
.of_node
;
197 struct mpc8xxx_spi_probe_info
*pinfo
;
198 struct fsl_spi_platform_data
*pdata
;
202 pinfo
= kzalloc(sizeof(*pinfo
), GFP_KERNEL
);
206 pdata
= &pinfo
->pdata
;
207 dev
->platform_data
= pdata
;
209 /* Allocate bus num dynamically. */
212 /* SPI controller is either clocked from QE or SoC clock. */
213 pdata
->sysclk
= get_brgfreq();
214 if (pdata
->sysclk
== -1) {
215 pdata
->sysclk
= fsl_get_sys_freq();
216 if (pdata
->sysclk
== -1) {
222 prop
= of_get_property(np
, "mode", NULL
);
223 if (prop
&& !strcmp(prop
, "cpu-qe"))
224 pdata
->flags
= SPI_QE_CPU_MODE
;
225 else if (prop
&& !strcmp(prop
, "qe"))
226 pdata
->flags
= SPI_CPM_MODE
| SPI_QE
;
227 else if (of_device_is_compatible(np
, "fsl,cpm2-spi"))
228 pdata
->flags
= SPI_CPM_MODE
| SPI_CPM2
;
229 else if (of_device_is_compatible(np
, "fsl,cpm1-spi"))
230 pdata
->flags
= SPI_CPM_MODE
| SPI_CPM1
;
This page took 0.043562 seconds and 5 git commands to generate.