1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Freescale SPI/eSPI controller driver library.
4 *
5 * Maintainer: Kumar Gala
6 *
7 * Copyright (C) 2006 Polycom, Inc.
8 *
9 * CPM SPI and QE buffer descriptors mode support:
10 * Copyright (c) 2009  MontaVista Software, Inc.
11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
12 *
13 * Copyright 2010 Freescale Semiconductor, Inc.
14 */
15#include <linux/dma-mapping.h>
16#include <linux/fsl_devices.h>
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/module.h>
21#include <linux/of_platform.h>
22#include <linux/spi/spi.h>
23#ifdef CONFIG_FSL_SOC
24#include <sysdev/fsl_soc.h>
25#endif
26
27#include "spi-fsl-lib.h"
28
29#define MPC8XXX_SPI_RX_BUF(type) 					  \
30void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \
31{									  \
32	type *rx = mpc8xxx_spi->rx;					  \
33	*rx++ = (type)(data >> mpc8xxx_spi->rx_shift);			  \
34	mpc8xxx_spi->rx = rx;						  \
35}									  \
36EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);
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}								\
49EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);
50
51MPC8XXX_SPI_RX_BUF(u8)
52MPC8XXX_SPI_RX_BUF(u16)
53MPC8XXX_SPI_RX_BUF(u32)
54MPC8XXX_SPI_TX_BUF(u8)
55MPC8XXX_SPI_TX_BUF(u16)
56MPC8XXX_SPI_TX_BUF(u32)
57
58struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
59{
60	return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
61}
62EXPORT_SYMBOL_GPL(to_of_pinfo);
63
64const 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}
78EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);
79
80void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
81			unsigned int irq)
82{
83	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
84	struct spi_master *master;
85	struct mpc8xxx_spi *mpc8xxx_spi;
86
87	master = dev_get_drvdata(dev);
88
89	/* the spi->mode bits understood by this driver: */
90	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
91			| SPI_LSB_FIRST | SPI_LOOP;
92
93	master->dev.of_node = dev->of_node;
94
95	mpc8xxx_spi = spi_master_get_devdata(master);
96	mpc8xxx_spi->dev = dev;
97	mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
98	mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
99	mpc8xxx_spi->flags = pdata->flags;
100	mpc8xxx_spi->spibrg = pdata->sysclk;
101	mpc8xxx_spi->irq = irq;
102
103	mpc8xxx_spi->rx_shift = 0;
104	mpc8xxx_spi->tx_shift = 0;
105
106	master->bus_num = pdata->bus_num;
107	master->num_chipselect = pdata->max_chipselect;
108
109	init_completion(&mpc8xxx_spi->done);
110}
111EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
112
113int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
114{
115	struct device *dev = &ofdev->dev;
116	struct device_node *np = ofdev->dev.of_node;
117	struct mpc8xxx_spi_probe_info *pinfo;
118	struct fsl_spi_platform_data *pdata;
119	const void *prop;
120	int ret = -ENOMEM;
121
122	pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
123	if (!pinfo)
124		return ret;
125
126	pdata = &pinfo->pdata;
127	dev->platform_data = pdata;
128
129	/* Allocate bus num dynamically. */
130	pdata->bus_num = -1;
131
132#ifdef CONFIG_FSL_SOC
133	/* SPI controller is either clocked from QE or SoC clock. */
134	pdata->sysclk = get_brgfreq();
135	if (pdata->sysclk == -1) {
136		pdata->sysclk = fsl_get_sys_freq();
137		if (pdata->sysclk == -1)
138			return -ENODEV;
139	}
140#else
141	ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
142	if (ret)
143		return ret;
144#endif
145
146	prop = of_get_property(np, "mode", NULL);
147	if (prop && !strcmp(prop, "cpu-qe"))
148		pdata->flags = SPI_QE_CPU_MODE;
149	else if (prop && !strcmp(prop, "qe"))
150		pdata->flags = SPI_CPM_MODE | SPI_QE;
151	else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
152		pdata->flags = SPI_CPM_MODE | SPI_CPM2;
153	else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
154		pdata->flags = SPI_CPM_MODE | SPI_CPM1;
155
156	return 0;
157}
158EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);
159
160MODULE_LICENSE("GPL");
161