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, 256 insertions, 0 deletions

diff --git a/drivers/mfd/glamo/glamo-spi-gpio.c b/drivers/mfd/glamo/glamo-spi-gpio.c
new file mode 100644
index 00000000000..73926bd22a4
--- /dev/null
+++ b/drivers/mfd/glamo/glamo-spi-gpio.c
@@ -0,0 +1,256 @@
+/*
+ * 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_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 spi->controller_data;
+}
+
+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;
+	int i;
+
+	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
+
+	ret = spi_bitbang_start(&sp->bitbang);
+	if (ret)
+		goto err_no_bitbang;
+
+	/* register the chips to go with the board */
+
+	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_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
+
+static struct platform_driver glamo_spi_drv = {
+	.probe		= glamo_spigpio_probe,
+	.remove		= glamo_spigpio_remove,
+	.suspend	= glamo_spigpio_suspend,
+	.resume		= glamo_spigpio_resume,
+	.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");