240 lines
5.4 KiB
C
240 lines
5.4 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/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 <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_spi {
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struct spi_bitbang bitbang;
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struct spi_master *master;
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struct glamo_spi_info *info;
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struct device *dev;
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};
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static inline struct glamo_spi *to_gs(struct spi_device *spi)
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{
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return spi->controller_data;
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}
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static int glamo_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
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{
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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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static void glamo_spi_chipsel(struct spi_device *spi, int value)
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{
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#if 0
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struct glamo_spi *gs = to_gs(spi);
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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->glamofb_handle);
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glamofb_cmd_mode(gs->info->glamofb_handle, value);
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#endif
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}
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static int glamo_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
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{
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struct glamo_spi *gs = to_gs(spi);
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const u_int16_t *ui16 = (const u_int16_t *) t->tx_buf;
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u_int16_t nine_bits;
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int i;
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dev_dbg(&spi->dev, "txrx: tx %p, rx %p, bpw %d, len %d\n",
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t->tx_buf, t->rx_buf, t->bits_per_word, t->len);
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if (spi->bits_per_word == 9)
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nine_bits = (1 << 9);
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else
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nine_bits = 0;
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if (t->len > 3 * sizeof(u_int16_t)) {
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dev_err(&spi->dev, "this driver doesn't support "
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"%u sized xfers\n", t->len);
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return -EINVAL;
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}
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for (i = 0; i < t->len/sizeof(u_int16_t); i++) {
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/* actually transfer the data */
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#if 1
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glamofb_cmd_write(gs->info->glamofb_handle,
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GLAMO_LCD_CMD_TYPE_SERIAL | nine_bits |
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(1 << 10) | (1 << 11) | (ui16[i] & 0x1ff));
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#endif
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/* FIXME: fire ?!? */
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if (i == 0 && (ui16[i] & 0x1ff) == 0x29) {
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dev_dbg(&spi->dev, "leaving command mode\n");
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glamofb_cmd_mode(gs->info->glamofb_handle, 0);
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}
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}
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return t->len;
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}
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static int glamo_spi_setup(struct spi_device *spi)
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{
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int ret;
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if (!spi->bits_per_word)
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spi->bits_per_word = 9;
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/* FIXME: hardware can do this */
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if (spi->mode & SPI_LSB_FIRST)
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return -EINVAL;
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ret = glamo_spi_setupxfer(spi, NULL);
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if (ret < 0) {
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dev_err(&spi->dev, "setupxfer returned %d\n", ret);
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return ret;
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}
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dev_dbg(&spi->dev, "%s: mode %d, %u bpw\n",
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__FUNCTION__, spi->mode, spi->bits_per_word);
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return 0;
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}
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static int glamo_spi_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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struct glamo_spi *sp;
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int ret;
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int i;
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master = spi_alloc_master(&pdev->dev, sizeof(struct glamo_spi));
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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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memset(sp, 0, sizeof(struct glamo_spi));
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sp->master = spi_master_get(master);
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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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dev_dbg(&pdev->dev, "sp->info(pdata) = %p\n", sp->info);
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sp->dev = &pdev->dev;
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platform_set_drvdata(pdev, sp);
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sp->bitbang.master = sp->master;
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sp->bitbang.setup_transfer = glamo_spi_setupxfer;
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sp->bitbang.chipselect = glamo_spi_chipsel;
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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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ret = spi_bitbang_start(&sp->bitbang);
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if (ret)
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goto err_no_bitbang;
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/* register the chips to go with the board */
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glamofb_cmd_mode(sp->info->glamofb_handle, 1);
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for (i = 0; i < sp->info->board_size; i++) {
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dev_info(&pdev->dev, "registering %p: %s\n",
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&sp->info->board_info[i],
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sp->info->board_info[i].modalias);
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sp->info->board_info[i].controller_data = sp;
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spi_new_device(master, sp->info->board_info + i);
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}
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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_spi_remove(struct platform_device *pdev)
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{
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struct glamo_spi *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_spi_suspend NULL
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#define glamo_spi_resume NULL
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static struct platform_driver glamo_spi_drv = {
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.probe = glamo_spi_probe,
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.remove = glamo_spi_remove,
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.suspend = glamo_spi_suspend,
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.resume = glamo_spi_resume,
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.driver = {
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.name = "glamo-lcm-spi",
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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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