linux-stable/drivers/mfd/ipaq-micro.c
Linus Walleij 035faf4bd2 mfd: ipaq-micro: Convert to built-in platform driver
Signal that this is a built-in driver and call its probe function
immediately on init. Suppress binding attributes and delete the
.remove() function since it is never unloaded. Tag probe() and
functions only called from probe() with __init. Delete all module
macros since this is a pure built-in.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-08-11 15:09:00 +01:00

462 lines
11 KiB
C

/*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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;
print_hex_dump_debug("data: ", DUMP_PREFIX_OFFSET, 16, 1,
tx->buf, tx->len, true);
/* 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));
print_hex_dump_debug("eeprom: ", DUMP_PREFIX_OFFSET, 16, 1,
dump, 256, true);
}
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 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);
if (!res)
return -EINVAL;
micro->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(micro->base))
return PTR_ERR(micro->base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
return -EINVAL;
micro->sdlc = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(micro->sdlc))
return PTR_ERR(micro->sdlc);
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(&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);