438 строки
11 KiB
C
438 строки
11 KiB
C
/*
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* dm355evm_msp.c - driver for MSP430 firmware on DM355EVM board
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*
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* Copyright (C) 2008 David Brownell
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/leds.h>
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#include <linux/i2c.h>
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#include <linux/i2c/dm355evm_msp.h>
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/*
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* The DM355 is a DaVinci chip with video support but no C64+ DSP. Its
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* EVM board has an MSP430 programmed with firmware for various board
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* support functions. This driver exposes some of them directly, and
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* supports other drivers (e.g. RTC, input) for more complex access.
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*
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* Because this firmware is entirely board-specific, this file embeds
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* knowledge that would be passed as platform_data in a generic driver.
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*
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* This driver was tested with firmware revision A4.
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*/
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#if defined(CONFIG_INPUT_DM355EVM) || defined(CONFIG_INPUT_DM355EVM_MODULE)
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#define msp_has_keyboard() true
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#else
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#define msp_has_keyboard() false
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#endif
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#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
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#define msp_has_leds() true
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#else
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#define msp_has_leds() false
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#endif
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#if defined(CONFIG_RTC_DRV_DM355EVM) || defined(CONFIG_RTC_DRV_DM355EVM_MODULE)
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#define msp_has_rtc() true
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#else
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#define msp_has_rtc() false
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#endif
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#if defined(CONFIG_VIDEO_TVP514X) || defined(CONFIG_VIDEO_TVP514X_MODULE)
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#define msp_has_tvp() true
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#else
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#define msp_has_tvp() false
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#endif
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/*----------------------------------------------------------------------*/
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/* REVISIT for paranoia's sake, retry reads/writes on error */
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static struct i2c_client *msp430;
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/**
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* dm355evm_msp_write - Writes a register in dm355evm_msp
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* @value: the value to be written
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* @reg: register address
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*
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* Returns result of operation - 0 is success, else negative errno
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*/
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int dm355evm_msp_write(u8 value, u8 reg)
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{
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return i2c_smbus_write_byte_data(msp430, reg, value);
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}
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EXPORT_SYMBOL(dm355evm_msp_write);
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/**
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* dm355evm_msp_read - Reads a register from dm355evm_msp
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* @reg: register address
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*
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* Returns result of operation - value, or negative errno
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*/
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int dm355evm_msp_read(u8 reg)
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{
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return i2c_smbus_read_byte_data(msp430, reg);
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}
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EXPORT_SYMBOL(dm355evm_msp_read);
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/*----------------------------------------------------------------------*/
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/*
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* Many of the msp430 pins are just used as fixed-direction GPIOs.
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* We could export a few more of them this way, if we wanted.
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*/
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#define MSP_GPIO(bit, reg) ((DM355EVM_MSP_ ## reg) << 3 | (bit))
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static const u8 msp_gpios[] = {
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/* eight leds */
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MSP_GPIO(0, LED), MSP_GPIO(1, LED),
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MSP_GPIO(2, LED), MSP_GPIO(3, LED),
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MSP_GPIO(4, LED), MSP_GPIO(5, LED),
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MSP_GPIO(6, LED), MSP_GPIO(7, LED),
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/* SW6 and the NTSC/nPAL jumper */
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MSP_GPIO(0, SWITCH1), MSP_GPIO(1, SWITCH1),
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MSP_GPIO(2, SWITCH1), MSP_GPIO(3, SWITCH1),
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MSP_GPIO(4, SWITCH1),
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/* switches on MMC/SD sockets */
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/*
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* Note: EVMDM355_ECP_VA4.pdf suggests that Bit 2 and 4 should be
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* checked for card detection. However on the EVM bit 1 and 3 gives
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* this status, for 0 and 1 instance respectively. The pdf also
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* suggests that Bit 1 and 3 should be checked for write protection.
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* However on the EVM bit 2 and 4 gives this status,for 0 and 1
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* instance respectively.
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*/
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MSP_GPIO(2, SDMMC), MSP_GPIO(1, SDMMC), /* mmc0 WP, nCD */
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MSP_GPIO(4, SDMMC), MSP_GPIO(3, SDMMC), /* mmc1 WP, nCD */
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};
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#define MSP_GPIO_REG(offset) (msp_gpios[(offset)] >> 3)
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#define MSP_GPIO_MASK(offset) BIT(msp_gpios[(offset)] & 0x07)
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static int msp_gpio_in(struct gpio_chip *chip, unsigned offset)
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{
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switch (MSP_GPIO_REG(offset)) {
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case DM355EVM_MSP_SWITCH1:
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case DM355EVM_MSP_SWITCH2:
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case DM355EVM_MSP_SDMMC:
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return 0;
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default:
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return -EINVAL;
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}
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}
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static u8 msp_led_cache;
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static int msp_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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int reg, status;
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reg = MSP_GPIO_REG(offset);
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status = dm355evm_msp_read(reg);
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if (status < 0)
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return status;
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if (reg == DM355EVM_MSP_LED)
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msp_led_cache = status;
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return !!(status & MSP_GPIO_MASK(offset));
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}
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static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value)
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{
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int mask, bits;
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/* NOTE: there are some other signals that could be
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* packaged as output GPIOs, but they aren't as useful
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* as the LEDs ... so for now we don't.
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*/
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if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED)
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return -EINVAL;
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mask = MSP_GPIO_MASK(offset);
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bits = msp_led_cache;
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bits &= ~mask;
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if (value)
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bits |= mask;
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msp_led_cache = bits;
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return dm355evm_msp_write(bits, DM355EVM_MSP_LED);
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}
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static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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msp_gpio_out(chip, offset, value);
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}
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static struct gpio_chip dm355evm_msp_gpio = {
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.label = "dm355evm_msp",
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.owner = THIS_MODULE,
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.direction_input = msp_gpio_in,
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.get = msp_gpio_get,
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.direction_output = msp_gpio_out,
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.set = msp_gpio_set,
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.base = -EINVAL, /* dynamic assignment */
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.ngpio = ARRAY_SIZE(msp_gpios),
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.can_sleep = true,
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};
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/*----------------------------------------------------------------------*/
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static struct device *add_child(struct i2c_client *client, const char *name,
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void *pdata, unsigned pdata_len,
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bool can_wakeup, int irq)
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{
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struct platform_device *pdev;
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int status;
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pdev = platform_device_alloc(name, -1);
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if (!pdev) {
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dev_dbg(&client->dev, "can't alloc dev\n");
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status = -ENOMEM;
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goto err;
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}
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device_init_wakeup(&pdev->dev, can_wakeup);
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pdev->dev.parent = &client->dev;
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if (pdata) {
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status = platform_device_add_data(pdev, pdata, pdata_len);
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if (status < 0) {
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dev_dbg(&pdev->dev, "can't add platform_data\n");
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goto err;
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}
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}
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if (irq) {
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struct resource r = {
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.start = irq,
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.flags = IORESOURCE_IRQ,
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};
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status = platform_device_add_resources(pdev, &r, 1);
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if (status < 0) {
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dev_dbg(&pdev->dev, "can't add irq\n");
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goto err;
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}
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}
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status = platform_device_add(pdev);
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err:
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if (status < 0) {
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platform_device_put(pdev);
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dev_err(&client->dev, "can't add %s dev\n", name);
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return ERR_PTR(status);
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}
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return &pdev->dev;
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}
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static int add_children(struct i2c_client *client)
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{
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static const struct {
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int offset;
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char *label;
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} config_inputs[] = {
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/* 8 == right after the LEDs */
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{ 8 + 0, "sw6_1", },
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{ 8 + 1, "sw6_2", },
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{ 8 + 2, "sw6_3", },
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{ 8 + 3, "sw6_4", },
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{ 8 + 4, "NTSC/nPAL", },
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};
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struct device *child;
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int status;
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int i;
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/* GPIO-ish stuff */
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dm355evm_msp_gpio.parent = &client->dev;
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status = gpiochip_add(&dm355evm_msp_gpio);
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if (status < 0)
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return status;
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/* LED output */
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if (msp_has_leds()) {
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#define GPIO_LED(l) .name = l, .active_low = true
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static struct gpio_led evm_leds[] = {
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{ GPIO_LED("dm355evm::ds14"),
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.default_trigger = "heartbeat", },
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{ GPIO_LED("dm355evm::ds15"),
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.default_trigger = "mmc0", },
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{ GPIO_LED("dm355evm::ds16"),
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/* could also be a CE-ATA drive */
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.default_trigger = "mmc1", },
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{ GPIO_LED("dm355evm::ds17"),
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.default_trigger = "nand-disk", },
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{ GPIO_LED("dm355evm::ds18"), },
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{ GPIO_LED("dm355evm::ds19"), },
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{ GPIO_LED("dm355evm::ds20"), },
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{ GPIO_LED("dm355evm::ds21"), },
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};
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#undef GPIO_LED
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struct gpio_led_platform_data evm_led_data = {
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.num_leds = ARRAY_SIZE(evm_leds),
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.leds = evm_leds,
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};
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for (i = 0; i < ARRAY_SIZE(evm_leds); i++)
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evm_leds[i].gpio = i + dm355evm_msp_gpio.base;
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/* NOTE: these are the only fully programmable LEDs
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* on the board, since GPIO-61/ds22 (and many signals
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* going to DC7) must be used for AEMIF address lines
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* unless the top 1 GB of NAND is unused...
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*/
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child = add_child(client, "leds-gpio",
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&evm_led_data, sizeof(evm_led_data),
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false, 0);
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if (IS_ERR(child))
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return PTR_ERR(child);
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}
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/* configuration inputs */
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for (i = 0; i < ARRAY_SIZE(config_inputs); i++) {
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int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset;
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gpio_request_one(gpio, GPIOF_IN, config_inputs[i].label);
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/* make it easy for userspace to see these */
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gpio_export(gpio, false);
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}
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/* MMC/SD inputs -- right after the last config input */
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if (dev_get_platdata(&client->dev)) {
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void (*mmcsd_setup)(unsigned) = dev_get_platdata(&client->dev);
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mmcsd_setup(dm355evm_msp_gpio.base + 8 + 5);
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}
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/* RTC is a 32 bit counter, no alarm */
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if (msp_has_rtc()) {
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child = add_child(client, "rtc-dm355evm",
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NULL, 0, false, 0);
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if (IS_ERR(child))
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return PTR_ERR(child);
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}
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/* input from buttons and IR remote (uses the IRQ) */
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if (msp_has_keyboard()) {
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child = add_child(client, "dm355evm_keys",
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NULL, 0, true, client->irq);
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if (IS_ERR(child))
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return PTR_ERR(child);
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}
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return 0;
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}
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/*----------------------------------------------------------------------*/
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static void dm355evm_command(unsigned command)
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{
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int status;
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status = dm355evm_msp_write(command, DM355EVM_MSP_COMMAND);
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if (status < 0)
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dev_err(&msp430->dev, "command %d failure %d\n",
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command, status);
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}
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static void dm355evm_power_off(void)
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{
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dm355evm_command(MSP_COMMAND_POWEROFF);
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}
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static int dm355evm_msp_remove(struct i2c_client *client)
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{
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pm_power_off = NULL;
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msp430 = NULL;
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return 0;
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}
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static int
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dm355evm_msp_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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int status;
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const char *video = msp_has_tvp() ? "TVP5146" : "imager";
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if (msp430)
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return -EBUSY;
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msp430 = client;
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/* display revision status; doubles as sanity check */
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status = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);
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if (status < 0)
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goto fail;
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dev_info(&client->dev, "firmware v.%02X, %s as video-in\n",
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status, video);
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/* mux video input: either tvp5146 or some external imager */
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status = dm355evm_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER,
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DM355EVM_MSP_VIDEO_IN);
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if (status < 0)
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dev_warn(&client->dev, "error %d muxing %s as video-in\n",
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status, video);
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/* init LED cache, and turn off the LEDs */
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msp_led_cache = 0xff;
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dm355evm_msp_write(msp_led_cache, DM355EVM_MSP_LED);
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/* export capabilities we support */
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status = add_children(client);
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if (status < 0)
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goto fail;
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/* PM hookup */
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pm_power_off = dm355evm_power_off;
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return 0;
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fail:
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/* FIXME remove children ... */
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dm355evm_msp_remove(client);
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return status;
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}
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static const struct i2c_device_id dm355evm_msp_ids[] = {
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{ "dm355evm_msp", 0 },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(i2c, dm355evm_msp_ids);
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static struct i2c_driver dm355evm_msp_driver = {
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.driver.name = "dm355evm_msp",
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.id_table = dm355evm_msp_ids,
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.probe = dm355evm_msp_probe,
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.remove = dm355evm_msp_remove,
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};
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static int __init dm355evm_msp_init(void)
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{
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return i2c_add_driver(&dm355evm_msp_driver);
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}
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subsys_initcall(dm355evm_msp_init);
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static void __exit dm355evm_msp_exit(void)
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{
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i2c_del_driver(&dm355evm_msp_driver);
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}
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module_exit(dm355evm_msp_exit);
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MODULE_DESCRIPTION("Interface to MSP430 firmware on DM355EVM");
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MODULE_LICENSE("GPL");
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