Merge tag 'linux-watchdog-6.6-rc1' of git://www.linux-watchdog.org/linux-watchdog
[platform/kernel/linux-starfive.git] / drivers / spi / spi-fsl-lib.c
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)                                          \
31 void 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 EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type);
38
39 #define MPC8XXX_SPI_TX_BUF(type)                                \
40 u32 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 }                                                               \
50 EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type);
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 EXPORT_SYMBOL_GPL(to_of_pinfo);
64
65 const 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 }
79 EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode);
80
81 void 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_master *master;
86         struct mpc8xxx_spi *mpc8xxx_spi;
87
88         master = dev_get_drvdata(dev);
89
90         /* the spi->mode bits understood by this driver: */
91         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
92                         | SPI_LSB_FIRST | SPI_LOOP;
93
94         master->dev.of_node = dev->of_node;
95
96         mpc8xxx_spi = spi_master_get_devdata(master);
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         master->bus_num = pdata->bus_num;
108         master->num_chipselect = pdata->max_chipselect;
109
110         init_completion(&mpc8xxx_spi->done);
111 }
112 EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
113
114 int 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 }
159 EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe);
160
161 MODULE_LICENSE("GPL");