mfd: Add driver for Atmel Microcontroller on iPaq h3xxx
This adds a driver for the Atmel Microcontroller found on the iPAQ h3xxx series. This device handles some keys, the touchscreen, and the battery monitoring. This is a port of a driver from handhelds.org 2.6.21 kernel, written by Alessandro Gardich based on Andrew Christians original HAL-driver. It has been heavily cleaned and converted to mfd-core by Dmitry Artamonow and rewritten again for the v3.x series kernels by Linus Walleij, bringing back some of the functionality lost from Andrew's original driver. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Alessandro Gardich <gremlin@gremlin.it> Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij
Lee Jones
Родитель
3d23799093
Коммит
dcc21cc09e
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@ -262,6 +262,16 @@ config MFD_INTEL_MSIC
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Passage) chip. This chip embeds audio, battery, GPIO, etc.
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devices used in Intel Medfield platforms.
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config MFD_IPAQ_MICRO
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bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
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depends on SA1100_H3100 || SA1100_H3600
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select MFD_CORE
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help
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Select this to get support for the Microcontroller found in
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the Compaq iPAQ handheld computers. This is an Atmel
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AT90LS8535 microcontroller flashed with a special iPAQ
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firmware using the custom protocol implemented in this driver.
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config MFD_JANZ_CMODIO
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tristate "Janz CMOD-IO PCI MODULbus Carrier Board"
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select MFD_CORE
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@ -168,3 +168,4 @@ obj-$(CONFIG_MFD_RETU) += retu-mfd.o
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obj-$(CONFIG_MFD_AS3711) += as3711.o
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obj-$(CONFIG_MFD_AS3722) += as3722.o
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obj-$(CONFIG_MFD_STW481X) += stw481x.o
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obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
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@ -0,0 +1,482 @@
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/*
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* Compaq iPAQ h3xxx Atmel microcontroller companion support
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*
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* This is an Atmel AT90LS8535 with a special flashed-in firmware that
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* implements the special protocol used by this driver.
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*
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* based on previous kernel 2.4 version by Andrew Christian
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* Author : Alessandro Gardich <gremlin@gremlin.it>
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* Author : Dmitry Artamonow <mad_soft@inbox.ru>
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* Author : Linus Walleij <linus.walleij@linaro.org>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/ipaq-micro.h>
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#include <linux/string.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <mach/hardware.h>
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static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
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{
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struct ipaq_micro_txdev *tx = µ->tx;
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struct ipaq_micro_msg *msg = micro->msg;
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int i, bp;
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u8 checksum;
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u32 val;
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bp = 0;
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tx->buf[bp++] = CHAR_SOF;
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checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
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tx->buf[bp++] = checksum;
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for (i = 0; i < msg->tx_len; i++) {
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tx->buf[bp++] = msg->tx_data[i];
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checksum += msg->tx_data[i];
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}
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tx->buf[bp++] = checksum;
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tx->len = bp;
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tx->index = 0;
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print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
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tx->buf, tx->len, true);
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/* Enable interrupt */
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val = readl(micro->base + UTCR3);
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val |= UTCR3_TIE;
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writel(val, micro->base + UTCR3);
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}
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int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
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{
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unsigned long flags;
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dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
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spin_lock_irqsave(µ->lock, flags);
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if (micro->msg) {
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list_add_tail(&msg->node, µ->queue);
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spin_unlock_irqrestore(µ->lock, flags);
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return 0;
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}
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micro->msg = msg;
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ipaq_micro_trigger_tx(micro);
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spin_unlock_irqrestore(µ->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(ipaq_micro_tx_msg);
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static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
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{
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int i;
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dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
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spin_lock(µ->lock);
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switch (id) {
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case MSG_VERSION:
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case MSG_EEPROM_READ:
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case MSG_EEPROM_WRITE:
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case MSG_BACKLIGHT:
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case MSG_NOTIFY_LED:
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case MSG_THERMAL_SENSOR:
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case MSG_BATTERY:
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/* Handle synchronous messages */
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if (micro->msg && micro->msg->id == id) {
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struct ipaq_micro_msg *msg = micro->msg;
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memcpy(msg->rx_data, data, len);
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msg->rx_len = len;
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complete(µ->msg->ack);
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if (!list_empty(µ->queue)) {
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micro->msg = list_entry(micro->queue.next,
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struct ipaq_micro_msg,
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node);
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list_del_init(µ->msg->node);
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ipaq_micro_trigger_tx(micro);
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} else
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micro->msg = NULL;
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dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
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} else {
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dev_err(micro->dev,
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"out of band RX message 0x%02x\n", id);
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if(!micro->msg)
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dev_info(micro->dev, "no message queued\n");
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else
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dev_info(micro->dev, "expected message %02x\n",
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micro->msg->id);
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}
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break;
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case MSG_KEYBOARD:
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if (micro->key)
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micro->key(micro->key_data, len, data);
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else
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dev_dbg(micro->dev, "key message ignored, no handle \n");
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break;
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case MSG_TOUCHSCREEN:
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if (micro->ts)
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micro->ts(micro->ts_data, len, data);
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else
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dev_dbg(micro->dev, "touchscreen message ignored, no handle \n");
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break;
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default:
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dev_err(micro->dev,
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"unknown msg %d [%d] ", id, len);
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for (i = 0; i < len; ++i)
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pr_cont("0x%02x ", data[i]);
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pr_cont("\n");
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}
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spin_unlock(µ->lock);
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}
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static void micro_process_char(struct ipaq_micro *micro, u8 ch)
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{
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struct ipaq_micro_rxdev *rx = µ->rx;
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switch (rx->state) {
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case STATE_SOF: /* Looking for SOF */
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if (ch == CHAR_SOF)
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rx->state = STATE_ID; /* Next byte is the id and len */
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break;
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case STATE_ID: /* Looking for id and len byte */
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rx->id = (ch & 0xf0) >> 4 ;
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rx->len = (ch & 0x0f);
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rx->index = 0;
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rx->chksum = ch;
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rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
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break;
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case STATE_DATA: /* Looking for 'len' data bytes */
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rx->chksum += ch;
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rx->buf[rx->index] = ch;
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if (++rx->index == rx->len)
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rx->state = STATE_CHKSUM;
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break;
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case STATE_CHKSUM: /* Looking for the checksum */
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if (ch == rx->chksum)
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micro_rx_msg(micro, rx->id, rx->len, rx->buf);
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rx->state = STATE_SOF;
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break;
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}
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}
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static void micro_rx_chars(struct ipaq_micro *micro)
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{
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u32 status, ch;
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while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
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ch = readl(micro->base + UTDR);
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if (status & UTSR1_PRE)
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dev_err(micro->dev, "rx: parity error\n");
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else if (status & UTSR1_FRE)
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dev_err(micro->dev, "rx: framing error\n");
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else if (status & UTSR1_ROR)
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dev_err(micro->dev, "rx: overrun error\n");
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micro_process_char(micro, ch);
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}
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}
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static void ipaq_micro_get_version(struct ipaq_micro *micro)
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{
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struct ipaq_micro_msg msg = {
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.id = MSG_VERSION,
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};
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ipaq_micro_tx_msg_sync(micro, &msg);
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if (msg.rx_len == 4) {
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memcpy(micro->version, msg.rx_data, 4);
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micro->version[4] = '\0';
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} else if (msg.rx_len == 9) {
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memcpy(micro->version, msg.rx_data, 4);
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micro->version[4] = '\0';
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/* Bytes 4-7 are "pack", byte 8 is "boot type" */
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} else {
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dev_err(micro->dev,
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"illegal version message %d bytes\n", msg.rx_len);
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}
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}
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static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
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u8 address, u8 len, u8 *data)
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{
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struct ipaq_micro_msg msg = {
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.id = MSG_EEPROM_READ,
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};
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u8 i;
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for (i = 0; i < len; i++) {
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msg.tx_data[0] = address + i;
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msg.tx_data[1] = 1;
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msg.tx_len = 2;
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ipaq_micro_tx_msg_sync(micro, &msg);
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memcpy(data + (i * 2), msg.rx_data, 2);
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}
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}
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static char *ipaq_micro_str(u8 *wchar, u8 len)
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{
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char retstr[256];
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u8 i;
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for (i = 0; i < len / 2; i++)
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retstr[i] = wchar[i * 2];
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return kstrdup(retstr, GFP_KERNEL);
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}
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static u16 ipaq_micro_to_u16(u8 *data)
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{
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return data[1] << 8 | data[0];
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}
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static void ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
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{
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u8 dump[256];
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char *str;
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ipaq_micro_eeprom_read(micro, 0, 128, dump);
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str = ipaq_micro_str(dump, 10);
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if (str) {
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dev_info(micro->dev, "HM version %s\n", str);
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kfree(str);
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}
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str = ipaq_micro_str(dump+10, 40);
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if (str) {
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dev_info(micro->dev, "serial number: %s\n", str);
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/* Feed the random pool with this */
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add_device_randomness(str, strlen(str));
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kfree(str);
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}
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str = ipaq_micro_str(dump+50, 20);
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if (str) {
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dev_info(micro->dev, "module ID: %s\n", str);
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kfree(str);
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}
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str = ipaq_micro_str(dump+70, 10);
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if (str) {
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dev_info(micro->dev, "product revision: %s\n", str);
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kfree(str);
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}
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dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
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dev_info(micro->dev, "frame rate: %u fps\n",
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ipaq_micro_to_u16(dump+82));
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dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
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dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
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dev_info(micro->dev, "color display: %s\n",
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ipaq_micro_to_u16(dump+88) ? "yes" : "no");
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dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
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dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
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dev_info(micro->dev, "screen: %u x %u\n",
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ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
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print_hex_dump(KERN_DEBUG, "eeprom: ", DUMP_PREFIX_OFFSET, 16, 1,
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dump, 256, true);
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}
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static void micro_tx_chars(struct ipaq_micro *micro)
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{
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struct ipaq_micro_txdev *tx = µ->tx;
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u32 val;
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while ((tx->index < tx->len) &&
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(readl(micro->base + UTSR1) & UTSR1_TNF)) {
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writel(tx->buf[tx->index], micro->base + UTDR);
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tx->index++;
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}
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/* Stop interrupts */
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val = readl(micro->base + UTCR3);
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val &= ~UTCR3_TIE;
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writel(val, micro->base + UTCR3);
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}
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static void micro_reset_comm(struct ipaq_micro *micro)
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{
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struct ipaq_micro_rxdev *rx = µ->rx;
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u32 val;
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if (micro->msg)
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complete(µ->msg->ack);
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/* Initialize Serial channel protocol frame */
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rx->state = STATE_SOF; /* Reset the state machine */
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/* Set up interrupts */
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writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
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/* Clean up CR3 */
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writel(0x0, micro->base + UTCR3);
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/* Format: 8N1 */
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writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
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/* Baud rate: 115200 */
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writel(0x0, micro->base + UTCR1);
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writel(0x1, micro->base + UTCR2);
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/* Clear SR0 */
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writel(0xff, micro->base + UTSR0);
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/* Enable RX int, disable TX int */
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writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
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val = readl(micro->base + UTCR3);
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val &= ~UTCR3_TIE;
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writel(val, micro->base + UTCR3);
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}
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static irqreturn_t micro_serial_isr(int irq, void *dev_id)
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{
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struct ipaq_micro *micro = dev_id;
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struct ipaq_micro_txdev *tx = µ->tx;
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u32 status;
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status = readl(micro->base + UTSR0);
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do {
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if (status & (UTSR0_RID | UTSR0_RFS)) {
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if (status & UTSR0_RID)
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/* Clear the Receiver IDLE bit */
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writel(UTSR0_RID, micro->base + UTSR0);
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micro_rx_chars(micro);
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}
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/* Clear break bits */
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if (status & (UTSR0_RBB | UTSR0_REB))
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writel(status & (UTSR0_RBB | UTSR0_REB),
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micro->base + UTSR0);
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if (status & UTSR0_TFS)
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micro_tx_chars(micro);
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status = readl(micro->base + UTSR0);
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} while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
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(status & (UTSR0_RFS | UTSR0_RID)));
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return IRQ_HANDLED;
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}
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static struct mfd_cell micro_cells[] = {
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{ .name = "ipaq-micro-backlight", },
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{ .name = "ipaq-micro-battery", },
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{ .name = "ipaq-micro-keys", },
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{ .name = "ipaq-micro-ts", },
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{ .name = "ipaq-micro-leds", },
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};
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static int micro_resume(struct device *dev)
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{
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struct ipaq_micro *micro = dev_get_drvdata(dev);
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micro_reset_comm(micro);
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mdelay(10);
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return 0;
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}
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static int micro_probe(struct platform_device *pdev)
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{
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struct ipaq_micro *micro;
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struct resource *res;
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int ret;
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int irq;
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micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
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if (!micro)
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return -ENOMEM;
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micro->dev = &pdev->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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micro->base = devm_request_and_ioremap(&pdev->dev, res);
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if (!micro->base)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res)
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return -EINVAL;
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micro->sdlc = devm_request_and_ioremap(&pdev->dev, res);
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if (!micro->sdlc)
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return -ENOMEM;
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micro_reset_comm(micro);
|
||||
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (!irq)
|
||||
return -EINVAL;
|
||||
ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
|
||||
IRQF_SHARED, "ipaq-micro",
|
||||
micro);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
|
||||
return ret;
|
||||
} else
|
||||
dev_info(&pdev->dev, "grabbed serial port IRQ\n");
|
||||
|
||||
spin_lock_init(µ->lock);
|
||||
INIT_LIST_HEAD(µ->queue);
|
||||
platform_set_drvdata(pdev, micro);
|
||||
|
||||
ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
|
||||
ARRAY_SIZE(micro_cells), NULL, 0, NULL);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "error adding MFD cells");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Check version */
|
||||
ipaq_micro_get_version(micro);
|
||||
dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
|
||||
ipaq_micro_eeprom_dump(micro);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int micro_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ipaq_micro *micro = platform_get_drvdata(pdev);
|
||||
u32 val;
|
||||
|
||||
mfd_remove_devices(&pdev->dev);
|
||||
|
||||
val = readl(micro->base + UTCR3);
|
||||
val &= ~(UTCR3_RXE | UTCR3_RIE); /* disable receive interrupt */
|
||||
val &= ~(UTCR3_TXE | UTCR3_TIE); /* disable transmit interrupt */
|
||||
writel(val, micro->base + UTCR3);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct dev_pm_ops micro_dev_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
|
||||
};
|
||||
|
||||
static struct platform_driver micro_device_driver = {
|
||||
.driver = {
|
||||
.name = "ipaq-h3xxx-micro",
|
||||
.pm = µ_dev_pm_ops,
|
||||
},
|
||||
.probe = micro_probe,
|
||||
.remove = micro_remove,
|
||||
/* .shutdown = micro_suspend, // FIXME */
|
||||
};
|
||||
module_platform_driver(micro_device_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("driver for iPAQ Atmel micro core and backlight");
|
||||
|
|
@ -0,0 +1,148 @@
|
|||
/*
|
||||
* Header file for the compaq Micro MFD
|
||||
*/
|
||||
|
||||
#ifndef _MFD_IPAQ_MICRO_H_
|
||||
#define _MFD_IPAQ_MICRO_H_
|
||||
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/completion.h>
|
||||
#include <linux/list.h>
|
||||
|
||||
#define TX_BUF_SIZE 32
|
||||
#define RX_BUF_SIZE 16
|
||||
#define CHAR_SOF 0x02
|
||||
|
||||
/*
|
||||
* These are the different messages that can be sent to the microcontroller
|
||||
* to control various aspects.
|
||||
*/
|
||||
#define MSG_VERSION 0x0
|
||||
#define MSG_KEYBOARD 0x2
|
||||
#define MSG_TOUCHSCREEN 0x3
|
||||
#define MSG_EEPROM_READ 0x4
|
||||
#define MSG_EEPROM_WRITE 0x5
|
||||
#define MSG_THERMAL_SENSOR 0x6
|
||||
#define MSG_NOTIFY_LED 0x8
|
||||
#define MSG_BATTERY 0x9
|
||||
#define MSG_SPI_READ 0xb
|
||||
#define MSG_SPI_WRITE 0xc
|
||||
#define MSG_BACKLIGHT 0xd /* H3600 only */
|
||||
#define MSG_CODEC_CTRL 0xe /* H3100 only */
|
||||
#define MSG_DISPLAY_CTRL 0xf /* H3100 only */
|
||||
|
||||
/* state of receiver parser */
|
||||
enum rx_state {
|
||||
STATE_SOF = 0, /* Next byte should be start of frame */
|
||||
STATE_ID, /* Next byte is ID & message length */
|
||||
STATE_DATA, /* Next byte is a data byte */
|
||||
STATE_CHKSUM /* Next byte should be checksum */
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ipaq_micro_txdev - TX state
|
||||
* @len: length of message in TX buffer
|
||||
* @index: current index into TX buffer
|
||||
* @buf: TX buffer
|
||||
*/
|
||||
struct ipaq_micro_txdev {
|
||||
u8 len;
|
||||
u8 index;
|
||||
u8 buf[TX_BUF_SIZE];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ipaq_micro_rxdev - RX state
|
||||
* @state: context of RX state machine
|
||||
* @chksum: calculated checksum
|
||||
* @id: message ID from packet
|
||||
* @len: RX buffer length
|
||||
* @index: RX buffer index
|
||||
* @buf: RX buffer
|
||||
*/
|
||||
struct ipaq_micro_rxdev {
|
||||
enum rx_state state;
|
||||
unsigned char chksum;
|
||||
u8 id;
|
||||
unsigned int len;
|
||||
unsigned int index;
|
||||
u8 buf[RX_BUF_SIZE];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ipaq_micro_msg - message to the iPAQ microcontroller
|
||||
* @id: 4-bit ID of the message
|
||||
* @tx_len: length of TX data
|
||||
* @tx_data: TX data to send
|
||||
* @rx_len: length of receieved RX data
|
||||
* @rx_data: RX data to recieve
|
||||
* @ack: a completion that will be completed when RX is complete
|
||||
* @node: list node if message gets queued
|
||||
*/
|
||||
struct ipaq_micro_msg {
|
||||
u8 id;
|
||||
u8 tx_len;
|
||||
u8 tx_data[TX_BUF_SIZE];
|
||||
u8 rx_len;
|
||||
u8 rx_data[RX_BUF_SIZE];
|
||||
struct completion ack;
|
||||
struct list_head node;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ipaq_micro - iPAQ microcontroller state
|
||||
* @dev: corresponding platform device
|
||||
* @base: virtual memory base for underlying serial device
|
||||
* @sdlc: virtual memory base for Synchronous Data Link Controller
|
||||
* @version: version string
|
||||
* @tx: TX state
|
||||
* @rx: RX state
|
||||
* @lock: lock for this state container
|
||||
* @msg: current message
|
||||
* @queue: message queue
|
||||
* @key: callback for asynchronous key events
|
||||
* @key_data: data to pass along with key events
|
||||
* @ts: callback for asynchronous touchscreen events
|
||||
* @ts_data: data to pass along with key events
|
||||
*/
|
||||
struct ipaq_micro {
|
||||
struct device *dev;
|
||||
void __iomem *base;
|
||||
void __iomem *sdlc;
|
||||
char version[5];
|
||||
struct ipaq_micro_txdev tx; /* transmit ISR state */
|
||||
struct ipaq_micro_rxdev rx; /* receive ISR state */
|
||||
spinlock_t lock;
|
||||
struct ipaq_micro_msg *msg;
|
||||
struct list_head queue;
|
||||
void (*key) (void *data, int len, unsigned char *rxdata);
|
||||
void *key_data;
|
||||
void (*ts) (void *data, int len, unsigned char *rxdata);
|
||||
void *ts_data;
|
||||
};
|
||||
|
||||
extern int
|
||||
ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg);
|
||||
|
||||
static inline int
|
||||
ipaq_micro_tx_msg_sync(struct ipaq_micro *micro,
|
||||
struct ipaq_micro_msg *msg)
|
||||
{
|
||||
int ret;
|
||||
|
||||
init_completion(&msg->ack);
|
||||
ret = ipaq_micro_tx_msg(micro, msg);
|
||||
wait_for_completion(&msg->ack);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int
|
||||
ipaq_micro_tx_msg_async(struct ipaq_micro *micro,
|
||||
struct ipaq_micro_msg *msg)
|
||||
{
|
||||
init_completion(&msg->ack);
|
||||
return ipaq_micro_tx_msg(micro, msg);
|
||||
}
|
||||
|
||||
#endif /* _MFD_IPAQ_MICRO_H_ */
|
||||
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