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