diff mbox

Attempt to introduce common MFD driver for MSP430 microprocessor support.

Message ID 1258626867-22604-1-git-send-email-panda@chelcom.ru (mailing list archive)
State Superseded
Headers show

Commit Message

A. Porodko Nov. 19, 2009, 10:34 a.m. UTC
None
diff mbox

Patch

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 570be13..becab4c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -35,13 +35,14 @@  config MFD_ASIC3
 	  This driver supports the ASIC3 multifunction chip found on many
 	  PDAs (mainly iPAQ and HTC based ones)
 
-config MFD_DM355EVM_MSP
-	bool "DaVinci DM355 EVM microcontroller"
-	depends on I2C && MACH_DAVINCI_DM355_EVM
+config MFD_DAVINCI_MSP
+	bool "DaVinci MSP430 microcontroller"
+	depends on I2C && (MACH_DAVINCI_DM355_EVM || MACH_NEUROS_OSD2)
 	help
 	  This driver supports the MSP430 microcontroller used on these
 	  boards.  MSP430 firmware manages resets and power sequencing,
-	  inputs from buttons and the IR remote, LEDs, an RTC, and more.
+	  inputs from buttons and the IR remote, LEDs, an RTC, and more
+	  (full set of features depends on particular board).
 
 config HTC_EGPIO
 	bool "HTC EGPIO support"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f3b277b..aeff3a2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -8,7 +8,7 @@  obj-$(CONFIG_MFD_ASIC3)		+= asic3.o
 obj-$(CONFIG_HTC_EGPIO)		+= htc-egpio.o
 obj-$(CONFIG_HTC_PASIC3)	+= htc-pasic3.o
 
-obj-$(CONFIG_MFD_DM355EVM_MSP)	+= dm355evm_msp.o
+obj-$(CONFIG_MFD_DAVINCI_MSP)	+= davinci_msp.o
 
 obj-$(CONFIG_MFD_T7L66XB)	+= t7l66xb.o
 obj-$(CONFIG_MFD_TC6387XB)	+= tc6387xb.o
diff --git a/drivers/mfd/davinci_msp.c b/drivers/mfd/davinci_msp.c
new file mode 100644
index 0000000..6164b24
--- /dev/null
+++ b/drivers/mfd/davinci_msp.c
@@ -0,0 +1,505 @@ 
+/*
+ * davinci_msp.c - driver for MSP430 firmware on some Davinci boards
+ *
+ * 2008 (c) David Brownell	(DM355 EVM support)
+ * 2009 (c) 2009 Andrey A. Porodko <Andrey.Porodko@gmail.com> (Neuros OSD2
+ * support)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+
+static struct device *add_child(struct i2c_client *client, const char *name,
+			void *pdata, unsigned pdata_len,
+			bool can_wakeup, int irq);
+
+/* REVISIT for paranoia's sake, retry reads/writes on error */
+
+static struct i2c_client *msp430;
+
+/**
+ * davinci_msp_write - Writes a register in msp
+ * @value: the value to be written
+ * @reg: register address
+ *
+ * Returns result of operation - 0 is success, else negative errno
+ */
+int davinci_msp_write(u8 value, u8 reg)
+{
+	return i2c_smbus_write_byte_data(msp430, reg, value);
+}
+EXPORT_SYMBOL(davinci_msp_write);
+
+/**
+ * davinci_msp_read - Reads a register from msp
+ * @reg: register address
+ *
+ * Returns result of operation - value, or negative errno
+ */
+int davinci_msp_read(u8 reg)
+{
+	return i2c_smbus_read_byte_data(msp430, reg);
+}
+EXPORT_SYMBOL(davinci_msp_read);
+
+#if defined(CONFIG_MACH_DAVINCI_DM355_EVM) /* exclusively for dm355evm 	*/
+/*
+ * The DM355 is a DaVinci chip with video support but no C64+ DSP.  Its
+ * EVM board has an MSP430 programmed with firmware for various board
+ * support functions.  This driver exposes some of them directly, and
+ * supports other drivers (e.g. RTC, input) for more complex access.
+ *
+ * Because this firmware is entirely board-specific, this file embeds
+ * knowledge that would be passed as platform_data in a generic driver.
+ *
+ * This driver was tested with firmware revision A4.
+ */
+#include <linux/i2c/dm355evm_msp.h>
+
+#if defined(CONFIG_INPUT_DM355EVM) || defined(CONFIG_INPUT_DM355EVM_MODULE)
+#define msp_has_keyboard()	true
+#else
+#define msp_has_keyboard()	false
+#endif
+
+#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
+#define msp_has_leds()		true
+#else
+#define msp_has_leds()		false
+#endif
+
+#if defined(CONFIG_RTC_DRV_DM355EVM) || defined(CONFIG_RTC_DRV_DM355EVM_MODULE)
+#define msp_has_rtc()		true
+#else
+#define msp_has_rtc()		false
+#endif
+
+#if defined(CONFIG_VIDEO_TVP514X) || defined(CONFIG_VIDEO_TVP514X_MODULE)
+#define msp_has_tvp()		true
+#else
+#define msp_has_tvp()		false
+#endif
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Many of the msp430 pins are just used as fixed-direction GPIOs.
+ * We could export a few more of them this way, if we wanted.
+ */
+#define MSP_GPIO(bit,reg)	((DM355EVM_MSP_ ## reg) << 3 | (bit))
+
+static const u8 msp_gpios[] = {
+	/* eight leds */
+	MSP_GPIO(0, LED), MSP_GPIO(1, LED),
+	MSP_GPIO(2, LED), MSP_GPIO(3, LED),
+	MSP_GPIO(4, LED), MSP_GPIO(5, LED),
+	MSP_GPIO(6, LED), MSP_GPIO(7, LED),
+	/* SW6 and the NTSC/nPAL jumper */
+	MSP_GPIO(0, SWITCH1), MSP_GPIO(1, SWITCH1),
+	MSP_GPIO(2, SWITCH1), MSP_GPIO(3, SWITCH1),
+	MSP_GPIO(4, SWITCH1),
+	/* switches on MMC/SD sockets */
+	/*
+	 * Note: EVMDM355_ECP_VA4.pdf suggests that Bit 2 and 4 should be
+	 * checked for card detection. However on the EVM bit 1 and 3 gives
+	 * this status, for 0 and 1 instance respectively. The pdf also
+	 * suggests that Bit 1 and 3 should be checked for write protection.
+	 * However on the EVM bit 2 and 4 gives this status,for 0 and 1
+	 * instance respectively.
+	 */
+	MSP_GPIO(2, SDMMC), MSP_GPIO(1, SDMMC),	/* mmc0 WP, nCD */
+	MSP_GPIO(4, SDMMC), MSP_GPIO(3, SDMMC),	/* mmc1 WP, nCD */
+};
+
+#define MSP_GPIO_REG(offset)	(msp_gpios[(offset)] >> 3)
+#define MSP_GPIO_MASK(offset)	BIT(msp_gpios[(offset)] & 0x07)
+
+static int msp_gpio_in(struct gpio_chip *chip, unsigned offset)
+{
+	switch (MSP_GPIO_REG(offset)) {
+	case DM355EVM_MSP_SWITCH1:
+	case DM355EVM_MSP_SWITCH2:
+	case DM355EVM_MSP_SDMMC:
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static u8 msp_led_cache;
+
+static int msp_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	int reg, status;
+
+	reg = MSP_GPIO_REG(offset);
+	status = davinci_msp_read(reg);
+	if (status < 0)
+		return status;
+	if (reg == DM355EVM_MSP_LED)
+		msp_led_cache = status;
+	return status & MSP_GPIO_MASK(offset);
+}
+
+static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value)
+{
+	int mask, bits;
+
+	/* NOTE:  there are some other signals that could be
+	 * packaged as output GPIOs, but they aren't as useful
+	 * as the LEDs ... so for now we don't.
+	 */
+	if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED)
+		return -EINVAL;
+
+	mask = MSP_GPIO_MASK(offset);
+	bits = msp_led_cache;
+
+	bits &= ~mask;
+	if (value)
+		bits |= mask;
+	msp_led_cache = bits;
+
+	return davinci_msp_write(bits, DM355EVM_MSP_LED);
+}
+
+static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	msp_gpio_out(chip, offset, value);
+}
+
+static struct gpio_chip dm355evm_msp_gpio = {
+	.label			= "dm355evm_msp",
+	.owner			= THIS_MODULE,
+	.direction_input	= msp_gpio_in,
+	.get			= msp_gpio_get,
+	.direction_output	= msp_gpio_out,
+	.set			= msp_gpio_set,
+	.base			= -EINVAL,	/* dynamic assignment 	*/
+	.ngpio			= ARRAY_SIZE(msp_gpios),
+	.can_sleep		= true,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int add_children(struct i2c_client *client)
+{
+	static const struct {
+		int offset;
+		char *label;
+	} config_inputs[] = {
+		/* 8 == right after the LEDs */
+		{ 8 + 0, "sw6_1", },
+		{ 8 + 1, "sw6_2", },
+		{ 8 + 2, "sw6_3", },
+		{ 8 + 3, "sw6_4", },
+		{ 8 + 4, "NTSC/nPAL", },
+	};
+
+	struct device	*child;
+	int		status;
+	int		i;
+
+	/* GPIO-ish stuff */
+	dm355evm_msp_gpio.dev = &client->dev;
+	status = gpiochip_add(&dm355evm_msp_gpio);
+	if (status < 0)
+		return status;
+
+	/* LED output */
+	if (msp_has_leds()) {
+#define GPIO_LED(l)	.name = l, .active_low = true
+		static struct gpio_led evm_leds[] = {
+			{ GPIO_LED("dm355evm::ds14"),
+				.default_trigger = "heartbeat", },
+			{ GPIO_LED("dm355evm::ds15"),
+				.default_trigger = "mmc0", },
+			{ GPIO_LED("dm355evm::ds16"),
+				/* could also be a CE-ATA drive */
+				.default_trigger = "mmc1", },
+			{ GPIO_LED("dm355evm::ds17"),
+				.default_trigger = "nand-disk", },
+			{ GPIO_LED("dm355evm::ds18"), },
+			{ GPIO_LED("dm355evm::ds19"), },
+			{ GPIO_LED("dm355evm::ds20"), },
+			{ GPIO_LED("dm355evm::ds21"), },
+		};
+#undef GPIO_LED
+
+		struct gpio_led_platform_data evm_led_data = {
+			.num_leds	= ARRAY_SIZE(evm_leds),
+			.leds		= evm_leds,
+		};
+
+		for (i = 0; i < ARRAY_SIZE(evm_leds); i++)
+			evm_leds[i].gpio = i + dm355evm_msp_gpio.base;
+
+		/* NOTE:  these are the only fully programmable LEDs
+		 * on the board, since GPIO-61/ds22 (and many signals
+		 * going to DC7) must be used for AEMIF address lines
+		 * unless the top 1 GB of NAND is unused...
+		 */
+		child = add_child(client, "leds-gpio",
+				&evm_led_data, sizeof(evm_led_data),
+				false, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	/* configuration inputs */
+	for (i = 0; i < ARRAY_SIZE(config_inputs); i++) {
+		int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset;
+
+		gpio_request(gpio, config_inputs[i].label);
+		gpio_direction_input(gpio);
+
+		/* make it easy for userspace to see these */
+		gpio_export(gpio, false);
+	}
+
+	/* MMC/SD inputs -- right after the last config input */
+	if (client->dev.platform_data) {
+		void (*mmcsd_setup)(unsigned) = client->dev.platform_data;
+
+		mmcsd_setup(dm355evm_msp_gpio.base + 8 + 5);
+	}
+
+	/* RTC is a 32 bit counter, no alarm */
+	if (msp_has_rtc()) {
+		child = add_child(client, "rtc-dm355evm",
+				NULL, 0, false, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	/* input from buttons and IR remote (uses the IRQ) */
+	if (msp_has_keyboard()) {
+		child = add_child(client, "dm355evm_keys",
+				NULL, 0, true, client->irq);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	return 0;
+}
+
+static void dm355evm_command(unsigned command)
+{
+	int status;
+
+	status = davinci_msp_write(command, DM355EVM_MSP_COMMAND);
+	if (status < 0)
+		dev_err(&msp430->dev, "command %d failure %d\n",
+				command, status);
+}
+
+static void dm355evm_power_off(void)
+{
+	dm355evm_command(MSP_COMMAND_POWEROFF);
+}
+#elif defined(CONFIG_MACH_NEUROS_OSD2)	/* exclusively for Neuros OSD2	*/
+/*
+ * Neuros OSD2 also has an MSP430 programmed with firmware for various board
+ * support functions.
+ */
+#include <linux/i2c/neuros_osd2_msp.h>
+
+#if defined(CONFIG_INPUT_NEUROS_OSD2) || \
+				defined(CONFIG_INPUT_NEUROS_OSD2_MODULE)
+#define msp_has_keys()	true
+#else
+#define msp_has_keys()	false
+#endif
+
+#if defined(CONFIG_RTC_DRV_NEUROS_OSD2) || \
+				defined(CONFIG_RTC_DRV_NEUROS_OSD2_MODULE)
+#define msp_has_rtc()		true
+#else
+#define msp_has_rtc()		false
+#endif
+
+#if defined(CONFIG_NEUROS_OSD2_IRBLASTER) || \
+				defined(CONFIG_NEUROS_OSD2_IRBLASTER_MODULE)
+#define msp_has_irblaster()	true
+#else
+#define msp_has_irblaster()	false
+#endif
+
+/*
+ * Inialize particular board specific resources
+ */
+static int add_children(struct i2c_client *client)
+{
+	struct device	*child;
+
+	/* RTC */
+	if (msp_has_rtc()) {
+		child = add_child(client, "rtc_neuros_osd2",
+				NULL, 0, false, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	/* input from IR remote (uses the IRQ) */
+	if (msp_has_keys()) {
+		child = add_child(client, "neuros_osd2_ir",
+				NULL, 0, true, client->irq);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	/* output to IR blaster  */
+	if (msp_has_irblaster()) {
+		child = add_child(client, "neuros_osd2_irblaster",
+				NULL, 0, true, client->irq);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+	return 0;
+}
+#endif
+
+/*
+ * Add single resource into the chain of platfrom specific MFD resources.
+ */
+static struct device *add_child(struct i2c_client *client, const char *name,
+			void *pdata, unsigned pdata_len,
+			bool can_wakeup, int irq)
+{
+	struct platform_device	*pdev;
+	int			status;
+
+	pdev = platform_device_alloc(name, -1);
+	if (!pdev) {
+		dev_dbg(&client->dev, "can't alloc dev\n");
+		status = -ENOMEM;
+		goto err;
+	}
+
+	device_init_wakeup(&pdev->dev, can_wakeup);
+	pdev->dev.parent = &client->dev;
+
+	if (pdata) {
+		status = platform_device_add_data(pdev, pdata, pdata_len);
+		if (status < 0) {
+			dev_dbg(&pdev->dev, "can't add platform_data\n");
+			goto err;
+		}
+	}
+
+	if (irq) {
+		struct resource r = {
+			.start = irq,
+			.flags = IORESOURCE_IRQ,
+		};
+
+		status = platform_device_add_resources(pdev, &r, 1);
+		if (status < 0) {
+			dev_dbg(&pdev->dev, "can't add irq\n");
+			goto err;
+		}
+	}
+
+	status = platform_device_add(pdev);
+
+err:
+	if (status < 0) {
+		platform_device_put(pdev);
+		dev_err(&client->dev, "can't add %s dev\n", name);
+		return ERR_PTR(status);
+	}
+	return &pdev->dev;
+}
+
+/*----------------------------------------------------------------------*/
+/*
+ * Driver initialization code
+*/
+static int davinci_msp_remove(struct i2c_client *client)
+{
+	pm_power_off = NULL;
+	msp430 = NULL;
+	return 0;
+}
+
+static int davinci_msp_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int		status;
+
+	if (msp430)
+		return -EBUSY;
+	msp430 = client;
+
+	/* export capabilities we support */
+	status = add_children(client);
+	if (status < 0)
+		goto fail;
+
+#if defined(CONFIG_MACH_DAVINCI_DM355_EVM) /* exclusively for dm355evm 	*/
+	{
+		const char	*video = msp_has_tvp() ? "TVP5146" : "imager";
+
+	/* display revision status; doubles as sanity check */
+	status = davinci_msp_read(DM355EVM_MSP_FIRMREV);
+	if (status < 0)
+		goto fail;
+	dev_info(&client->dev, "firmware v.%02X, %s as video-in\n",
+			status, video);
+
+	/* mux video input:  either tvp5146 or some external imager */
+	status = davinci_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER,
+			DM355EVM_MSP_VIDEO_IN);
+	if (status < 0)
+		dev_warn(&client->dev, "error %d muxing %s as video-in\n",
+			status, video);
+
+	/* init LED cache, and turn off the LEDs */
+	msp_led_cache = 0xff;
+	davinci_msp_write(msp_led_cache, DM355EVM_MSP_LED);
+
+	/* PM hookup */
+	pm_power_off = dm355evm_power_off;
+	}
+#endif
+	return 0;
+
+fail:
+	/* FIXME remove children ... */
+	davinci_msp_remove(client);
+	return status;
+}
+
+
+static const struct i2c_device_id davinci_msp_ids[] = {
+	{ "davinci_msp", 0 },
+	{ /* end of list */ },
+};
+MODULE_DEVICE_TABLE(i2c, davincim_msp_ids);
+
+static struct i2c_driver davinci_msp_driver = {
+	.driver.name	= "davinci_msp",
+	.id_table	= davinci_msp_ids,
+	.probe		= davinci_msp_probe,
+	.remove		= davinci_msp_remove,
+};
+
+static int __init davinci_msp_init(void)
+{
+	return i2c_add_driver(&davinci_msp_driver);
+}
+subsys_initcall(davinci_msp_init);
+
+static void __exit davinci_msp_exit(void)
+{
+	i2c_del_driver(&davinci_msp_driver);
+}
+module_exit(davinci_msp_exit);
+
+MODULE_DESCRIPTION("Interface to MSP430 firmware on Davinci");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/i2c/dm355evm_msp.h b/include/linux/i2c/dm355evm_msp.h
index 3724703..63cd992 100644
--- a/include/linux/i2c/dm355evm_msp.h
+++ b/include/linux/i2c/dm355evm_msp.h
@@ -14,9 +14,10 @@ 
  */
 
 /* utilities to access "registers" emulated by msp430 firmware */
-extern int dm355evm_msp_write(u8 value, u8 reg);
-extern int dm355evm_msp_read(u8 reg);
-
+extern int davinci_msp_write(u8 value, u8 reg);
+extern int davinci_msp_read(u8 reg);
+#define	dm355evm_msp_write	davinci_msp_write
+#define	dm355evm_msp_read	davinci_msp_read
 
 /* command/control registers */
 #define DM355EVM_MSP_COMMAND		0x00
diff --git a/include/linux/i2c/neuros_osd2_msp.h b/include/linux/i2c/neuros_osd2_msp.h
new file mode 100644
index 0000000..4295aef
--- /dev/null
+++ b/include/linux/i2c/neuros_osd2_msp.h
@@ -0,0 +1,45 @@ 
+/*
+ * neuros_osd2_msp.h - support MSP430 microcontroller on Neuros OSD2 board
+ * 2009 (c) Andrey A. Porodko <Andrey.Porodko@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#ifndef __LINUX_I2C_NEUROS_OSD2_MSP
+#define __LINUX_I2C_NEUROS_OSD2_MSP
+
+/* utilities to access "registers" emulated by msp430 firmware */
+extern int davinci_msp_write(u8 value, u8 reg);
+extern int davinci_msp_read(u8 reg);
+#define	ntosd2_msp_write	davinci_msp_write
+#define	ntosd2_msp_read		davinci_msp_read
+
+/* MSP commands (registers) */
+#define	NTOSD2_MSP430_GETIRCODE	  0xB0
+#define	NTOSD2_MSP430_GETVER	  0x36
+#define NTOSD2_MSP430_RTC_MDAY	  0x19
+#define	NTOSD2_MSP430_RTC_MONTH	  0x1A
+#define	NTOSD2_MSP430_RTC_YEAR	  0x1B /* year since 2006, 0 = 2006	*/
+#define	NTOSD2_MSP430_RTC_HOURS	  0x18
+#define	NTOSD2_MSP430_RTC_MINUTES 0x17
+#define	NTOSD2_MSP430_RTC_SECONDS 0x16
+
+#define	NTOSD2_MSP430_READ_RETRIES 3
+
+#define	NTOSD2_MSP430_RESET	  6    /* reset to MSP430 high - active	*/
+#define	NTOSD2_MSP430_IRR_IRQ	  7    /* Raw data from IR sensor	*/
+#define	NTOSD2_MSP430_PWM0	  45   /* out, generates 38 kHz for IR Blaster*/
+#define	NTOSD2_MSP430_ARM_BLSTR	  47   /* Raw data to IR Blaster	*/
+
+#define	NTOSD2_MSP430_MAX_PULSES  128  /* max pulses in buffer		*/
+#define	NTOSD2_MSP430_IO_TIMEOUT  75   /* default I/O timeout in ms	*/
+#define	NTOSD2_MSP430_POOLING_TIMEOUT 10000/* default sensor polling in us */
+
+#define	NTOSD2_IR_BLASTER_IOC_MAGIC 'i'/* code for IR blaster ioctl	*/
+#define RRB_SET_IO_TIMEOUT 	  _IOW(NTOSD2_IR_BLASTER_IOC_MAGIC, \
+					1, unsigned long)
+#define RRB_SET_POOLING_TIMEOUT   _IOW(NTOSD2_IR_BLASTER_IOC_MAGIC, \
+					2, unsigned long)
+
+#endif /* __LINUX_I2C_NEUROS_OSD2_MSP */