279 lines
6.7 KiB
C
279 lines
6.7 KiB
C
/*
|
|
* Copyright (C) 2007 Openmoko, Inc.
|
|
* Author: Harald Welte <laforge@openmoko.org>
|
|
*
|
|
* Smedia Glamo GPIO based SPI driver
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This driver currently only implements a minimum subset of the hardware
|
|
* features, esp. those features that are required to drive the jbt6k74
|
|
* LCM controller asic in the TD028TTEC1 LCM.
|
|
*
|
|
*/
|
|
|
|
#define DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/spi/spi_bitbang.h>
|
|
#include <linux/spi/glamo.h>
|
|
|
|
#include <linux/glamofb.h>
|
|
|
|
#include <mach/hardware.h>
|
|
|
|
#include "glamo-core.h"
|
|
#include "glamo-regs.h"
|
|
|
|
struct glamo_spigpio {
|
|
struct spi_bitbang bitbang;
|
|
struct spi_master *master;
|
|
struct glamo_spigpio_info *info;
|
|
struct glamo_core *glamo;
|
|
};
|
|
|
|
static inline struct glamo_spigpio *to_sg(struct spi_device *spi)
|
|
{
|
|
return dev_get_drvdata(&spi->master->dev);
|
|
}
|
|
|
|
static inline void setsck(struct spi_device *dev, int on)
|
|
{
|
|
struct glamo_spigpio *sg = to_sg(dev);
|
|
glamo_gpio_setpin(sg->glamo, sg->info->pin_clk, on ? 1 : 0);
|
|
}
|
|
|
|
static inline void setmosi(struct spi_device *dev, int on)
|
|
{
|
|
struct glamo_spigpio *sg = to_sg(dev);
|
|
glamo_gpio_setpin(sg->glamo, sg->info->pin_mosi, on ? 1 : 0);
|
|
}
|
|
|
|
static inline u32 getmiso(struct spi_device *dev)
|
|
{
|
|
struct glamo_spigpio *sg = to_sg(dev);
|
|
if (sg->info->pin_miso)
|
|
return glamo_gpio_getpin(sg->glamo, sg->info->pin_miso) ? 1 : 0;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
#define spidelay(x) ndelay(x)
|
|
|
|
#define EXPAND_BITBANG_TXRX
|
|
#include <linux/spi/spi_bitbang.h>
|
|
|
|
static u32 glamo_spigpio_txrx_mode0(struct spi_device *spi,
|
|
unsigned nsecs, u32 word, u8 bits)
|
|
{
|
|
return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
|
|
}
|
|
|
|
static u32 glamo_spigpio_txrx_mode1(struct spi_device *spi,
|
|
unsigned nsecs, u32 word, u8 bits)
|
|
{
|
|
return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
|
|
}
|
|
|
|
static u32 glamo_spigpio_txrx_mode2(struct spi_device *spi,
|
|
unsigned nsecs, u32 word, u8 bits)
|
|
{
|
|
return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
|
|
}
|
|
|
|
static u32 glamo_spigpio_txrx_mode3(struct spi_device *spi,
|
|
unsigned nsecs, u32 word, u8 bits)
|
|
{
|
|
return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
|
|
}
|
|
|
|
|
|
#if 0
|
|
static int glamo_spigpio_setupxfer(struct spi_device *spi,
|
|
struct spi_transfer *t)
|
|
{
|
|
struct glamo_spi *gs = to_sg(spi);
|
|
unsigned int bpw;
|
|
|
|
bpw = t ? t->bits_per_word : spi->bits_per_word;
|
|
|
|
if (bpw != 9 && bpw != 8) {
|
|
dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void glamo_spigpio_chipsel(struct spi_device *spi, int value)
|
|
{
|
|
struct glamo_spigpio *gs = to_sg(spi);
|
|
#if 0
|
|
dev_dbg(&spi->dev, "chipsel %d: spi=%p, gs=%p, info=%p, handle=%p\n",
|
|
value, spi, gs, gs->info, gs->info->glamo);
|
|
#endif
|
|
glamo_gpio_setpin(gs->glamo, gs->info->pin_cs, value ? 0 : 1);
|
|
}
|
|
|
|
|
|
static int glamo_spigpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct spi_master *master;
|
|
struct glamo_spigpio *sp;
|
|
int ret;
|
|
|
|
master = spi_alloc_master(&pdev->dev, sizeof(struct glamo_spigpio));
|
|
if (master == NULL) {
|
|
dev_err(&pdev->dev, "failed to allocate spi master\n");
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
sp = spi_master_get_devdata(master);
|
|
platform_set_drvdata(pdev, sp);
|
|
sp->info = pdev->dev.platform_data;
|
|
if (!sp->info) {
|
|
dev_err(&pdev->dev, "can't operate without platform data\n");
|
|
ret = -EIO;
|
|
goto err_no_pdev;
|
|
}
|
|
|
|
master->num_chipselect = 1;
|
|
master->bus_num = 2; /* FIXME: use dynamic number */
|
|
|
|
sp->master = spi_master_get(master);
|
|
sp->glamo = sp->info->glamo;
|
|
|
|
sp->bitbang.master = sp->master;
|
|
sp->bitbang.chipselect = glamo_spigpio_chipsel;
|
|
sp->bitbang.txrx_word[SPI_MODE_0] = glamo_spigpio_txrx_mode0;
|
|
sp->bitbang.txrx_word[SPI_MODE_1] = glamo_spigpio_txrx_mode1;
|
|
sp->bitbang.txrx_word[SPI_MODE_2] = glamo_spigpio_txrx_mode2;
|
|
sp->bitbang.txrx_word[SPI_MODE_3] = glamo_spigpio_txrx_mode3;
|
|
|
|
/* set state of spi pins */
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_clk, 0);
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_mosi, 0);
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_cs, 1);
|
|
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_clk);
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_mosi);
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_cs);
|
|
if (sp->info->pin_miso)
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_miso);
|
|
|
|
/* bring the LCM panel out of reset if it isn't already */
|
|
|
|
glamo_gpio_setpin(sp->glamo, GLAMO_GPIO4, 1);
|
|
glamo_gpio_cfgpin(sp->glamo, GLAMO_GPIO4_OUTPUT);
|
|
msleep(90);
|
|
|
|
#if 0
|
|
sp->dev = &pdev->dev;
|
|
|
|
sp->bitbang.setup_transfer = glamo_spi_setupxfer;
|
|
sp->bitbang.txrx_bufs = glamo_spi_txrx;
|
|
sp->bitbang.master->setup = glamo_spi_setup;
|
|
#endif
|
|
|
|
dev_set_drvdata(&sp->master->dev, sp);
|
|
|
|
ret = spi_bitbang_start(&sp->bitbang);
|
|
if (ret)
|
|
goto err_no_bitbang;
|
|
|
|
return 0;
|
|
|
|
err_no_bitbang:
|
|
platform_set_drvdata(pdev, NULL);
|
|
err_no_pdev:
|
|
spi_master_put(sp->bitbang.master);
|
|
err:
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int glamo_spigpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct glamo_spigpio *sp = platform_get_drvdata(pdev);
|
|
|
|
spi_bitbang_stop(&sp->bitbang);
|
|
spi_master_put(sp->bitbang.master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*#define glamo_spigpio_suspend NULL
|
|
#define glamo_spigpio_resume NULL
|
|
*/
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
static int glamo_spigpio_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int glamo_spigpio_resume(struct platform_device *pdev)
|
|
{
|
|
struct glamo_spigpio *sp = platform_get_drvdata(pdev);
|
|
|
|
if (!sp)
|
|
return 0;
|
|
|
|
/* set state of spi pins */
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_clk, 0);
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_mosi, 0);
|
|
glamo_gpio_setpin(sp->glamo, sp->info->pin_cs, 1);
|
|
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_clk);
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_mosi);
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_cs);
|
|
if (sp->info->pin_miso)
|
|
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_miso);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static struct platform_driver glamo_spi_drv = {
|
|
.probe = glamo_spigpio_probe,
|
|
.remove = glamo_spigpio_remove,
|
|
#ifdef CONFIG_PM
|
|
.suspend_late = glamo_spigpio_suspend,
|
|
.resume_early = glamo_spigpio_resume,
|
|
#endif
|
|
.driver = {
|
|
.name = "glamo-spi-gpio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init glamo_spi_init(void)
|
|
{
|
|
return platform_driver_register(&glamo_spi_drv);
|
|
}
|
|
|
|
static void __exit glamo_spi_exit(void)
|
|
{
|
|
platform_driver_unregister(&glamo_spi_drv);
|
|
}
|
|
|
|
module_init(glamo_spi_init);
|
|
module_exit(glamo_spi_exit);
|
|
|
|
MODULE_DESCRIPTION("Smedia Glamo 336x/337x LCM serial command SPI Driver");
|
|
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>")
|
|
MODULE_LICENSE("GPL");
|