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.h>
22#include <linux/platform_device.h>
23#include <linux/spi/spi.h>
24#ifdef CONFIG_FSL_SOC
25#include <sysdev/fsl_soc.h>
26#endif
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}									  \
37EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);
38
39#define MPC8XXX_SPI_TX_BUF(type)				\
40u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi)	\
41{								\
42	u32 data;						\
43	const type *tx = mpc8xxx_spi->tx;			\
44	if (!tx)						\
45		return 0;					\
46	data = *tx++ << mpc8xxx_spi->tx_shift;			\
47	mpc8xxx_spi->tx = tx;					\
48	return data;						\
49}								\
50EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);
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}
63EXPORT_SYMBOL_GPL(to_of_pinfo);
64
65const char *mpc8xxx_spi_strmode(unsigned int flags)
66{
67	if (flags & SPI_QE_CPU_MODE) {
68		return "QE CPU";
69	} else if (flags & SPI_CPM_MODE) {
70		if (flags & SPI_QE)
71			return "QE";
72		else if (flags & SPI_CPM2)
73			return "CPM2";
74		else
75			return "CPM1";
76	}
77	return "CPU";
78}
79EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);
80
81void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
82			unsigned int irq)
83{
84	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
85	struct spi_controller *ctlr;
86	struct mpc8xxx_spi *mpc8xxx_spi;
87
88	ctlr = dev_get_drvdata(dev);
89
90	/* the spi->mode bits understood by this driver: */
91	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
92			| SPI_LSB_FIRST | SPI_LOOP;
93
94	ctlr->dev.of_node = dev->of_node;
95
96	mpc8xxx_spi = spi_controller_get_devdata(ctlr);
97	mpc8xxx_spi->dev = dev;
98	mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
99	mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
100	mpc8xxx_spi->flags = pdata->flags;
101	mpc8xxx_spi->spibrg = pdata->sysclk;
102	mpc8xxx_spi->irq = irq;
103
104	mpc8xxx_spi->rx_shift = 0;
105	mpc8xxx_spi->tx_shift = 0;
106
107	ctlr->bus_num = pdata->bus_num;
108	ctlr->num_chipselect = pdata->max_chipselect;
109
110	init_completion(&mpc8xxx_spi->done);
111}
112EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
113
114int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
115{
116	struct device *dev = &ofdev->dev;
117	struct device_node *np = ofdev->dev.of_node;
118	struct mpc8xxx_spi_probe_info *pinfo;
119	struct fsl_spi_platform_data *pdata;
120	const void *prop;
121	int ret = -ENOMEM;
122
123	pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
124	if (!pinfo)
125		return ret;
126
127	pdata = &pinfo->pdata;
128	dev->platform_data = pdata;
129
130	/* Allocate bus num dynamically. */
131	pdata->bus_num = -1;
132
133#ifdef CONFIG_FSL_SOC
134	/* SPI controller is either clocked from QE or SoC clock. */
135	pdata->sysclk = get_brgfreq();
136	if (pdata->sysclk == -1) {
137		pdata->sysclk = fsl_get_sys_freq();
138		if (pdata->sysclk == -1)
139			return -ENODEV;
140	}
141#else
142	ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk);
143	if (ret)
144		return ret;
145#endif
146
147	prop = of_get_property(np, "mode", NULL);
148	if (prop && !strcmp(prop, "cpu-qe"))
149		pdata->flags = SPI_QE_CPU_MODE;
150	else if (prop && !strcmp(prop, "qe"))
151		pdata->flags = SPI_CPM_MODE | SPI_QE;
152	else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
153		pdata->flags = SPI_CPM_MODE | SPI_CPM2;
154	else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
155		pdata->flags = SPI_CPM_MODE | SPI_CPM1;
156
157	return 0;
158}
159EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);
160
161MODULE_LICENSE("GPL");
162