smedia-glamo.patch

[ FIXME:
 include/asm-arm/arch-s3c2410/irqs.h shouldn't contain device-specific
 changes. ]

This is a Linux kernel driver for the Smedia Glamo336x / Glamo337x
multi-function peripheral device.

Signed-off-by: Harald Welte <laforge@openmoko.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/drivers/mfd/glamo/glamo-lcm-spi.c b/drivers/mfd/glamo/glamo-lcm-spi.c
new file mode 100644
index 00000000000..92cabe4dbb0
--- /dev/null
+++ b/drivers/mfd/glamo/glamo-lcm-spi.c
@@ -0,0 +1,241 @@
+/*
+ * 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 <asm/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)
+{
+	struct glamo_spi *gs = to_gs(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;
+}
+
+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");