blob: 4cd5ecc722112bf5af86500eef730320ac475c4c [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Compaq iPAQ h3xxx Atmel microcontroller companion support
*
* This is an Atmel AT90LS8535 with a special flashed-in firmware that
* implements the special protocol used by this driver.
*
* based on previous kernel 2.4 version by Andrew Christian
* Author : Alessandro Gardich <gremlin@gremlin.it>
* Author : Dmitry Artamonow <mad_soft@inbox.ru>
* Author : Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ipaq-micro.h>
#include <linux/string.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <mach/hardware.h>
static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
{
struct ipaq_micro_txdev *tx = &micro->tx;
struct ipaq_micro_msg *msg = micro->msg;
int i, bp;
u8 checksum;
u32 val;
bp = 0;
tx->buf[bp++] = CHAR_SOF;
checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
tx->buf[bp++] = checksum;
for (i = 0; i < msg->tx_len; i++) {
tx->buf[bp++] = msg->tx_data[i];
checksum += msg->tx_data[i];
}
tx->buf[bp++] = checksum;
tx->len = bp;
tx->index = 0;
/* Enable interrupt */
val = readl(micro->base + UTCR3);
val |= UTCR3_TIE;
writel(val, micro->base + UTCR3);
}
int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
{
unsigned long flags;
dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
spin_lock_irqsave(&micro->lock, flags);
if (micro->msg) {
list_add_tail(&msg->node, &micro->queue);
spin_unlock_irqrestore(&micro->lock, flags);
return 0;
}
micro->msg = msg;
ipaq_micro_trigger_tx(micro);
spin_unlock_irqrestore(&micro->lock, flags);
return 0;
}
EXPORT_SYMBOL(ipaq_micro_tx_msg);
static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
{
int i;
dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
spin_lock(&micro->lock);
switch (id) {
case MSG_VERSION:
case MSG_EEPROM_READ:
case MSG_EEPROM_WRITE:
case MSG_BACKLIGHT:
case MSG_NOTIFY_LED:
case MSG_THERMAL_SENSOR:
case MSG_BATTERY:
/* Handle synchronous messages */
if (micro->msg && micro->msg->id == id) {
struct ipaq_micro_msg *msg = micro->msg;
memcpy(msg->rx_data, data, len);
msg->rx_len = len;
complete(&micro->msg->ack);
if (!list_empty(&micro->queue)) {
micro->msg = list_entry(micro->queue.next,
struct ipaq_micro_msg,
node);
list_del_init(&micro->msg->node);
ipaq_micro_trigger_tx(micro);
} else
micro->msg = NULL;
dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
} else {
dev_err(micro->dev,
"out of band RX message 0x%02x\n", id);
if (!micro->msg)
dev_info(micro->dev, "no message queued\n");
else
dev_info(micro->dev, "expected message %02x\n",
micro->msg->id);
}
break;
case MSG_KEYBOARD:
if (micro->key)
micro->key(micro->key_data, len, data);
else
dev_dbg(micro->dev, "key message ignored, no handle\n");
break;
case MSG_TOUCHSCREEN:
if (micro->ts)
micro->ts(micro->ts_data, len, data);
else
dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
break;
default:
dev_err(micro->dev,
"unknown msg %d [%d] ", id, len);
for (i = 0; i < len; ++i)
pr_cont("0x%02x ", data[i]);
pr_cont("\n");
}
spin_unlock(&micro->lock);
}
static void micro_process_char(struct ipaq_micro *micro, u8 ch)
{
struct ipaq_micro_rxdev *rx = &micro->rx;
switch (rx->state) {
case STATE_SOF: /* Looking for SOF */
if (ch == CHAR_SOF)
rx->state = STATE_ID; /* Next byte is the id and len */
break;
case STATE_ID: /* Looking for id and len byte */
rx->id = (ch & 0xf0) >> 4;
rx->len = (ch & 0x0f);
rx->index = 0;
rx->chksum = ch;
rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
break;
case STATE_DATA: /* Looking for 'len' data bytes */
rx->chksum += ch;
rx->buf[rx->index] = ch;
if (++rx->index == rx->len)
rx->state = STATE_CHKSUM;
break;
case STATE_CHKSUM: /* Looking for the checksum */
if (ch == rx->chksum)
micro_rx_msg(micro, rx->id, rx->len, rx->buf);
rx->state = STATE_SOF;
break;
}
}
static void micro_rx_chars(struct ipaq_micro *micro)
{
u32 status, ch;
while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
ch = readl(micro->base + UTDR);
if (status & UTSR1_PRE)
dev_err(micro->dev, "rx: parity error\n");
else if (status & UTSR1_FRE)
dev_err(micro->dev, "rx: framing error\n");
else if (status & UTSR1_ROR)
dev_err(micro->dev, "rx: overrun error\n");
micro_process_char(micro, ch);
}
}
static void ipaq_micro_get_version(struct ipaq_micro *micro)
{
struct ipaq_micro_msg msg = {
.id = MSG_VERSION,
};
ipaq_micro_tx_msg_sync(micro, &msg);
if (msg.rx_len == 4) {
memcpy(micro->version, msg.rx_data, 4);
micro->version[4] = '\0';
} else if (msg.rx_len == 9) {
memcpy(micro->version, msg.rx_data, 4);
micro->version[4] = '\0';
/* Bytes 4-7 are "pack", byte 8 is "boot type" */
} else {
dev_err(micro->dev,
"illegal version message %d bytes\n", msg.rx_len);
}
}
static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
u8 address, u8 len, u8 *data)
{
struct ipaq_micro_msg msg = {
.id = MSG_EEPROM_READ,
};
u8 i;
for (i = 0; i < len; i++) {
msg.tx_data[0] = address + i;
msg.tx_data[1] = 1;
msg.tx_len = 2;
ipaq_micro_tx_msg_sync(micro, &msg);
memcpy(data + (i * 2), msg.rx_data, 2);
}
}
static char *ipaq_micro_str(u8 *wchar, u8 len)
{
char retstr[256];
u8 i;
for (i = 0; i < len / 2; i++)
retstr[i] = wchar[i * 2];
return kstrdup(retstr, GFP_KERNEL);
}
static u16 ipaq_micro_to_u16(u8 *data)
{
return data[1] << 8 | data[0];
}
static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
{
u8 dump[256];
char *str;
ipaq_micro_eeprom_read(micro, 0, 128, dump);
str = ipaq_micro_str(dump, 10);
if (str) {
dev_info(micro->dev, "HW version %s\n", str);
kfree(str);
}
str = ipaq_micro_str(dump+10, 40);
if (str) {
dev_info(micro->dev, "serial number: %s\n", str);
/* Feed the random pool with this */
add_device_randomness(str, strlen(str));
kfree(str);
}
str = ipaq_micro_str(dump+50, 20);
if (str) {
dev_info(micro->dev, "module ID: %s\n", str);
kfree(str);
}
str = ipaq_micro_str(dump+70, 10);
if (str) {
dev_info(micro->dev, "product revision: %s\n", str);
kfree(str);
}
dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
dev_info(micro->dev, "frame rate: %u fps\n",
ipaq_micro_to_u16(dump+82));
dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
dev_info(micro->dev, "color display: %s\n",
ipaq_micro_to_u16(dump+88) ? "yes" : "no");
dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
dev_info(micro->dev, "screen: %u x %u\n",
ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
}
static void micro_tx_chars(struct ipaq_micro *micro)
{
struct ipaq_micro_txdev *tx = &micro->tx;
u32 val;
while ((tx->index < tx->len) &&
(readl(micro->base + UTSR1) & UTSR1_TNF)) {
writel(tx->buf[tx->index], micro->base + UTDR);
tx->index++;
}
/* Stop interrupts */
val = readl(micro->base + UTCR3);
val &= ~UTCR3_TIE;
writel(val, micro->base + UTCR3);
}
static void micro_reset_comm(struct ipaq_micro *micro)
{
struct ipaq_micro_rxdev *rx = &micro->rx;
u32 val;
if (micro->msg)
complete(&micro->msg->ack);
/* Initialize Serial channel protocol frame */
rx->state = STATE_SOF; /* Reset the state machine */
/* Set up interrupts */
writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
/* Clean up CR3 */
writel(0x0, micro->base + UTCR3);
/* Format: 8N1 */
writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
/* Baud rate: 115200 */
writel(0x0, micro->base + UTCR1);
writel(0x1, micro->base + UTCR2);
/* Clear SR0 */
writel(0xff, micro->base + UTSR0);
/* Enable RX int, disable TX int */
writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
val = readl(micro->base + UTCR3);
val &= ~UTCR3_TIE;
writel(val, micro->base + UTCR3);
}
static irqreturn_t micro_serial_isr(int irq, void *dev_id)
{
struct ipaq_micro *micro = dev_id;
struct ipaq_micro_txdev *tx = &micro->tx;
u32 status;
status = readl(micro->base + UTSR0);
do {
if (status & (UTSR0_RID | UTSR0_RFS)) {
if (status & UTSR0_RID)
/* Clear the Receiver IDLE bit */
writel(UTSR0_RID, micro->base + UTSR0);
micro_rx_chars(micro);
}
/* Clear break bits */
if (status & (UTSR0_RBB | UTSR0_REB))
writel(status & (UTSR0_RBB | UTSR0_REB),
micro->base + UTSR0);
if (status & UTSR0_TFS)
micro_tx_chars(micro);
status = readl(micro->base + UTSR0);
} while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
(status & (UTSR0_RFS | UTSR0_RID)));
return IRQ_HANDLED;
}
static const struct mfd_cell micro_cells[] = {
{ .name = "ipaq-micro-backlight", },
{ .name = "ipaq-micro-battery", },
{ .name = "ipaq-micro-keys", },
{ .name = "ipaq-micro-ts", },
{ .name = "ipaq-micro-leds", },
};
static int __maybe_unused micro_resume(struct device *dev)
{
struct ipaq_micro *micro = dev_get_drvdata(dev);
micro_reset_comm(micro);
mdelay(10);
return 0;
}
static int __init micro_probe(struct platform_device *pdev)
{
struct ipaq_micro *micro;
struct resource *res;
int ret;
int irq;
micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
if (!micro)
return -ENOMEM;
micro->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
micro->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(micro->base))
return PTR_ERR(micro->base);
micro->sdlc = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(micro->sdlc))
return PTR_ERR(micro->sdlc);
micro_reset_comm(micro);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
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(&micro->lock);
INIT_LIST_HEAD(&micro->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 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 = &micro_dev_pm_ops,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver_probe(micro_device_driver, micro_probe);