1 // SPDX-License-Identifier: GPL-2.0-only
3  * SH SCI SPI interface
7  * Based on S3C24XX GPIO based SPI driver, which is:
17 #include <linux/spi/spi.h>
18 #include <linux/spi/spi_bitbang.h>
21 #include <asm/spi.h>
33 #define SCSPTR(sp)	(sp->membase + 0x1c)
45 	 * This makes regular read-modify-write difficult so we  in setbits()
46 	 * use sp->val to keep track of the latest register value.  in setbits()
50 		sp->val |= bits;  in setbits()
52 		sp->val &= ~bits;  in setbits()
54 	iowrite8(sp->val, SCSPTR(sp));  in setbits()
59 	setbits(spi_controller_get_devdata(dev->controller), PIN_SCK, on);  in setsck()
64 	setbits(spi_controller_get_devdata(dev->controller), PIN_TXD, on);  in setmosi()
69 	struct sh_sci_spi *sp = spi_controller_get_devdata(dev->controller);  in getmiso()
76 #include "spi-bitbang-txrx.h"
78 static u32 sh_sci_spi_txrx_mode0(struct spi_device *spi,  in sh_sci_spi_txrx_mode0()  argument
82 	return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);  in sh_sci_spi_txrx_mode0()
85 static u32 sh_sci_spi_txrx_mode1(struct spi_device *spi,  in sh_sci_spi_txrx_mode1()  argument
89 	return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);  in sh_sci_spi_txrx_mode1()
92 static u32 sh_sci_spi_txrx_mode2(struct spi_device *spi,  in sh_sci_spi_txrx_mode2()  argument
96 	return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);  in sh_sci_spi_txrx_mode2()
99 static u32 sh_sci_spi_txrx_mode3(struct spi_device *spi,  in sh_sci_spi_txrx_mode3()  argument
103 	return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);  in sh_sci_spi_txrx_mode3()
108 	struct sh_sci_spi *sp = spi_controller_get_devdata(dev->controller);  in sh_sci_spi_chipselect()
110 	if (sp->info->chip_select)  in sh_sci_spi_chipselect()
111 		(sp->info->chip_select)(sp->info, spi_get_chipselect(dev, 0), value);  in sh_sci_spi_chipselect()
121 	host = spi_alloc_host(&dev->dev, sizeof(struct sh_sci_spi));  in sh_sci_spi_probe()
123 		dev_err(&dev->dev, "failed to allocate spi host\n");  in sh_sci_spi_probe()
124 		ret = -ENOMEM;  in sh_sci_spi_probe()
131 	sp->info = dev_get_platdata(&dev->dev);  in sh_sci_spi_probe()
132 	if (!sp->info) {  in sh_sci_spi_probe()
133 		dev_err(&dev->dev, "platform data is missing\n");  in sh_sci_spi_probe()
134 		ret = -ENOENT;  in sh_sci_spi_probe()
138 	/* setup spi bitbang adaptor */  in sh_sci_spi_probe()
139 	sp->bitbang.ctlr = host;  in sh_sci_spi_probe()
140 	sp->bitbang.ctlr->bus_num = sp->info->bus_num;  in sh_sci_spi_probe()
141 	sp->bitbang.ctlr->num_chipselect = sp->info->num_chipselect;  in sh_sci_spi_probe()
142 	sp->bitbang.chipselect = sh_sci_spi_chipselect;  in sh_sci_spi_probe()
144 	sp->bitbang.txrx_word[SPI_MODE_0] = sh_sci_spi_txrx_mode0;  in sh_sci_spi_probe()
145 	sp->bitbang.txrx_word[SPI_MODE_1] = sh_sci_spi_txrx_mode1;  in sh_sci_spi_probe()
146 	sp->bitbang.txrx_word[SPI_MODE_2] = sh_sci_spi_txrx_mode2;  in sh_sci_spi_probe()
147 	sp->bitbang.txrx_word[SPI_MODE_3] = sh_sci_spi_txrx_mode3;  in sh_sci_spi_probe()
151 		ret = -ENOENT;  in sh_sci_spi_probe()
154 	sp->membase = ioremap(r->start, resource_size(r));  in sh_sci_spi_probe()
155 	if (!sp->membase) {  in sh_sci_spi_probe()
156 		ret = -ENXIO;  in sh_sci_spi_probe()
159 	sp->val = ioread8(SCSPTR(sp));  in sh_sci_spi_probe()
162 	ret = spi_bitbang_start(&sp->bitbang);  in sh_sci_spi_probe()
167 	iounmap(sp->membase);  in sh_sci_spi_probe()
169 	spi_controller_put(sp->bitbang.ctlr);  in sh_sci_spi_probe()
178 	spi_bitbang_stop(&sp->bitbang);  in sh_sci_spi_remove()
180 	iounmap(sp->membase);  in sh_sci_spi_remove()
181 	spi_controller_put(sp->bitbang.ctlr);  in sh_sci_spi_remove()
193 MODULE_DESCRIPTION("SH SCI SPI Driver");