spi: SuperH SPI using SCI
Add support for SPI over SCI pins. SCI is a very simple serial controller block that can be found on older SuperH processors. In theory it is possible to use the SCI hardware block in syncronous mode, but this version of the driver simply hooks up the bit banging code on the SCI pins. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Magnus Damm
Linus Torvalds
parent
b359fbc458
commit
37e4664087
3 changed files with 213 additions and 0 deletions
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@ -176,6 +176,13 @@ config SPI_S3C24XX_GPIO
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the inbuilt hardware cannot provide the transfer mode, or
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where the board is using non hardware connected pins.
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config SPI_SH_SCI
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tristate "SuperH SCI SPI controller"
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depends on SPI_MASTER && SUPERH
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select SPI_BITBANG
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help
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SPI driver for SuperH SCI blocks.
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config SPI_TXX9
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tristate "Toshiba TXx9 SPI controller"
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depends on SPI_MASTER && GENERIC_GPIO && CPU_TX49XX
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@ -27,6 +27,7 @@ obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o
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obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
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obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
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obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
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obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
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# ... add above this line ...
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# SPI protocol drivers (device/link on bus)
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205
drivers/spi/spi_sh_sci.c
Normal file
205
drivers/spi/spi_sh_sci.c
Normal file
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@ -0,0 +1,205 @@
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/*
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* SH SCI SPI interface
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*
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* Copyright (c) 2008 Magnus Damm
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*
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* Based on S3C24XX GPIO based SPI driver, which is:
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* Copyright (c) 2006 Ben Dooks
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* Copyright (c) 2006 Simtec Electronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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#include <asm/spi.h>
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#include <asm/io.h>
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struct sh_sci_spi {
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struct spi_bitbang bitbang;
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void __iomem *membase;
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unsigned char val;
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struct sh_spi_info *info;
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struct platform_device *dev;
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};
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#define SCSPTR(sp) (sp->membase + 0x1c)
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#define PIN_SCK (1 << 2)
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#define PIN_TXD (1 << 0)
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#define PIN_RXD PIN_TXD
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#define PIN_INIT ((1 << 1) | (1 << 3) | PIN_SCK | PIN_TXD)
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static inline void setbits(struct sh_sci_spi *sp, int bits, int on)
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{
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/*
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* We are the only user of SCSPTR so no locking is required.
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* Reading bit 2 and 0 in SCSPTR gives pin state as input.
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* Writing the same bits sets the output value.
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* This makes regular read-modify-write difficult so we
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* use sp->val to keep track of the latest register value.
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*/
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if (on)
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sp->val |= bits;
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else
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sp->val &= ~bits;
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iowrite8(sp->val, SCSPTR(sp));
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}
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static inline void setsck(struct spi_device *dev, int on)
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{
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setbits(spi_master_get_devdata(dev->master), PIN_SCK, on);
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}
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static inline void setmosi(struct spi_device *dev, int on)
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{
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setbits(spi_master_get_devdata(dev->master), PIN_TXD, on);
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}
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static inline u32 getmiso(struct spi_device *dev)
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{
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struct sh_sci_spi *sp = spi_master_get_devdata(dev->master);
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return (ioread8(SCSPTR(sp)) & PIN_RXD) ? 1 : 0;
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}
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#define spidelay(x) ndelay(x)
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#define EXPAND_BITBANG_TXRX
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#include <linux/spi/spi_bitbang.h>
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static u32 sh_sci_spi_txrx_mode0(struct spi_device *spi,
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unsigned nsecs, u32 word, u8 bits)
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{
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return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
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}
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static u32 sh_sci_spi_txrx_mode1(struct spi_device *spi,
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unsigned nsecs, u32 word, u8 bits)
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{
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return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
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}
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static u32 sh_sci_spi_txrx_mode2(struct spi_device *spi,
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unsigned nsecs, u32 word, u8 bits)
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{
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return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
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}
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static u32 sh_sci_spi_txrx_mode3(struct spi_device *spi,
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unsigned nsecs, u32 word, u8 bits)
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{
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return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
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}
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static void sh_sci_spi_chipselect(struct spi_device *dev, int value)
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{
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struct sh_sci_spi *sp = spi_master_get_devdata(dev->master);
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if (sp->info && sp->info->chip_select)
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(sp->info->chip_select)(sp->info, dev->chip_select, value);
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}
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static int sh_sci_spi_probe(struct platform_device *dev)
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{
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struct resource *r;
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struct spi_master *master;
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struct sh_sci_spi *sp;
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int ret;
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master = spi_alloc_master(&dev->dev, sizeof(struct sh_sci_spi));
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if (master == NULL) {
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dev_err(&dev->dev, "failed to allocate spi master\n");
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ret = -ENOMEM;
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goto err0;
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}
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sp = spi_master_get_devdata(master);
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platform_set_drvdata(dev, sp);
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sp->info = dev->dev.platform_data;
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/* setup spi bitbang adaptor */
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sp->bitbang.master = spi_master_get(master);
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sp->bitbang.master->bus_num = sp->info->bus_num;
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sp->bitbang.master->num_chipselect = sp->info->num_chipselect;
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sp->bitbang.chipselect = sh_sci_spi_chipselect;
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sp->bitbang.txrx_word[SPI_MODE_0] = sh_sci_spi_txrx_mode0;
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sp->bitbang.txrx_word[SPI_MODE_1] = sh_sci_spi_txrx_mode1;
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sp->bitbang.txrx_word[SPI_MODE_2] = sh_sci_spi_txrx_mode2;
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sp->bitbang.txrx_word[SPI_MODE_3] = sh_sci_spi_txrx_mode3;
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r = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (r == NULL) {
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ret = -ENOENT;
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goto err1;
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}
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sp->membase = ioremap(r->start, r->end - r->start + 1);
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if (!sp->membase) {
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ret = -ENXIO;
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goto err1;
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}
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sp->val = ioread8(SCSPTR(sp));
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setbits(sp, PIN_INIT, 1);
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ret = spi_bitbang_start(&sp->bitbang);
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if (!ret)
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return 0;
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setbits(sp, PIN_INIT, 0);
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iounmap(sp->membase);
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err1:
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spi_master_put(sp->bitbang.master);
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err0:
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return ret;
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}
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static int sh_sci_spi_remove(struct platform_device *dev)
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{
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struct sh_sci_spi *sp = platform_get_drvdata(dev);
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iounmap(sp->membase);
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setbits(sp, PIN_INIT, 0);
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spi_bitbang_stop(&sp->bitbang);
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spi_master_put(sp->bitbang.master);
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return 0;
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}
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static struct platform_driver sh_sci_spi_drv = {
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.probe = sh_sci_spi_probe,
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.remove = sh_sci_spi_remove,
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.driver = {
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.name = "spi_sh_sci",
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.owner = THIS_MODULE,
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},
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};
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static int __init sh_sci_spi_init(void)
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{
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return platform_driver_register(&sh_sci_spi_drv);
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}
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module_init(sh_sci_spi_init);
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static void __exit sh_sci_spi_exit(void)
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{
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platform_driver_unregister(&sh_sci_spi_drv);
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}
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module_exit(sh_sci_spi_exit);
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MODULE_DESCRIPTION("SH SCI SPI Driver");
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MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
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MODULE_LICENSE("GPL");
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