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authorlars <lars@3c298f89-4303-0410-b956-a3cf2f4a3e73>2009-05-18 17:55:41 +0000
committerlars <lars@3c298f89-4303-0410-b956-a3cf2f4a3e73>2009-05-18 17:55:41 +0000
commitfb189822fcab111e55d1c7e83c482dc2c144500a (patch)
treedd10e61f382ace3afbe40af3af8238757cf5e3d0 /target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c
parentc5f7c391b56bb88e21895f0fc9310cd0919e8d0c (diff)
[s3c24xx] bump to 2.6.30-rc6
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15918 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c')
-rw-r--r--target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c
new file mode 100644
index 000000000..a7129fe79
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c
@@ -0,0 +1,240 @@
+/*
+ * 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_spi {
+ struct spi_bitbang bitbang;
+ struct spi_master *master;
+ struct glamo_spi_info *info;
+ struct device *dev;
+};
+
+static inline struct glamo_spi *to_gs(struct spi_device *spi)
+{
+ return spi->controller_data;
+}
+
+static int glamo_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ 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;
+}
+
+static void glamo_spi_chipsel(struct spi_device *spi, int value)
+{
+#if 0
+ struct glamo_spi *gs = to_gs(spi);
+
+ dev_dbg(&spi->dev, "chipsel %d: spi=%p, gs=%p, info=%p, handle=%p\n",
+ value, spi, gs, gs->info, gs->info->glamofb_handle);
+
+ glamofb_cmd_mode(gs->info->glamofb_handle, value);
+#endif
+}
+
+static int glamo_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct glamo_spi *gs = to_gs(spi);
+ const u_int16_t *ui16 = (const u_int16_t *) t->tx_buf;
+ u_int16_t nine_bits;
+ int i;
+
+ dev_dbg(&spi->dev, "txrx: tx %p, rx %p, bpw %d, len %d\n",
+ t->tx_buf, t->rx_buf, t->bits_per_word, t->len);
+
+ if (spi->bits_per_word == 9)
+ nine_bits = (1 << 9);
+ else
+ nine_bits = 0;
+
+ if (t->len > 3 * sizeof(u_int16_t)) {
+ dev_err(&spi->dev, "this driver doesn't support "
+ "%u sized xfers\n", t->len);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < t->len/sizeof(u_int16_t); i++) {
+ /* actually transfer the data */
+#if 1
+ glamofb_cmd_write(gs->info->glamofb_handle,
+ GLAMO_LCD_CMD_TYPE_SERIAL | nine_bits |
+ (1 << 10) | (1 << 11) | (ui16[i] & 0x1ff));
+#endif
+ /* FIXME: fire ?!? */
+ if (i == 0 && (ui16[i] & 0x1ff) == 0x29) {
+ dev_dbg(&spi->dev, "leaving command mode\n");
+ glamofb_cmd_mode(gs->info->glamofb_handle, 0);
+ }
+ }
+
+ return t->len;
+}
+
+static int glamo_spi_setup(struct spi_device *spi)
+{
+ int ret;
+
+ if (!spi->bits_per_word)
+ spi->bits_per_word = 9;
+
+ /* FIXME: hardware can do this */
+ if (spi->mode & SPI_LSB_FIRST)
+ return -EINVAL;
+
+ ret = glamo_spi_setupxfer(spi, NULL);
+ if (ret < 0) {
+ dev_err(&spi->dev, "setupxfer returned %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(&spi->dev, "%s: mode %d, %u bpw\n",
+ __FUNCTION__, spi->mode, spi->bits_per_word);
+
+ return 0;
+}
+
+static int glamo_spi_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct glamo_spi *sp;
+ int ret;
+ int i;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct glamo_spi));
+ if (master == NULL) {
+ dev_err(&pdev->dev, "failed to allocate spi master\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sp = spi_master_get_devdata(master);
+ memset(sp, 0, sizeof(struct glamo_spi));
+
+ sp->master = spi_master_get(master);
+ 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;
+ }
+ dev_dbg(&pdev->dev, "sp->info(pdata) = %p\n", sp->info);
+
+ sp->dev = &pdev->dev;
+
+ platform_set_drvdata(pdev, sp);
+
+ sp->bitbang.master = sp->master;
+ sp->bitbang.setup_transfer = glamo_spi_setupxfer;
+ sp->bitbang.chipselect = glamo_spi_chipsel;
+ sp->bitbang.txrx_bufs = glamo_spi_txrx;
+ sp->bitbang.master->setup = glamo_spi_setup;
+
+ ret = spi_bitbang_start(&sp->bitbang);
+ if (ret)
+ goto err_no_bitbang;
+
+ /* register the chips to go with the board */
+
+ glamofb_cmd_mode(sp->info->glamofb_handle, 1);
+
+ for (i = 0; i < sp->info->board_size; i++) {
+ dev_info(&pdev->dev, "registering %p: %s\n",
+ &sp->info->board_info[i],
+ sp->info->board_info[i].modalias);
+
+ sp->info->board_info[i].controller_data = sp;
+ spi_new_device(master, sp->info->board_info + i);
+ }
+
+ 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_spi_remove(struct platform_device *pdev)
+{
+ struct glamo_spi *sp = platform_get_drvdata(pdev);
+
+ spi_bitbang_stop(&sp->bitbang);
+ spi_master_put(sp->bitbang.master);
+
+ return 0;
+}
+
+#define glamo_spi_suspend NULL
+#define glamo_spi_resume NULL
+
+static struct platform_driver glamo_spi_drv = {
+ .probe = glamo_spi_probe,
+ .remove = glamo_spi_remove,
+ .suspend = glamo_spi_suspend,
+ .resume = glamo_spi_resume,
+ .driver = {
+ .name = "glamo-lcm-spi",
+ .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");