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openwrtv3/target/linux/s3c24xx/patches/0048-fiq-hdq.patch.patch

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From d183fa083737f2b042ecf92166951c30fd83fe61 Mon Sep 17 00:00:00 2001
From: mokopatches <mokopatches@openmoko.org>
Date: Fri, 25 Jul 2008 22:21:23 +0100
Subject: [PATCH] fiq-hdq.patch
---
arch/arm/mach-s3c2440/mach-gta02.c | 204 +++++++++++++++++++++-
drivers/power/Kconfig | 8 +
drivers/power/Makefile | 2 +
drivers/power/gta02_hdq.c | 250 ++++++++++++++++++++++++++
include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h | 23 +++
include/asm-arm/arch-s3c2410/gta02.h | 1 +
include/linux/gta02_hdq.h | 8 +
7 files changed, 495 insertions(+), 1 deletions(-)
create mode 100644 drivers/power/gta02_hdq.c
create mode 100644 include/linux/gta02_hdq.h
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index 8c7bbe7..cea76e7 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -99,6 +99,19 @@ EXPORT_SYMBOL(fiq_ipc);
#define FIQ_DIVISOR_VIBRATOR DIVISOR_FROM_US(100)
+#ifdef CONFIG_GTA02_HDQ
+/* HDQ specific */
+#define HDQ_SAMPLE_PERIOD_US 20
+/* private HDQ FSM state -- all other info interesting for caller in fiq_ipc */
+static enum hdq_bitbang_states hdq_state;
+static u8 hdq_ctr;
+static u8 hdq_ctr2;
+static u8 hdq_bit;
+static u8 hdq_shifter;
+static u8 hdq_tx_data_done;
+
+#define FIQ_DIVISOR_HDQ DIVISOR_FROM_US(HDQ_SAMPLE_PERIOD_US)
+#endif
/* define FIQ ISR */
FIQ_HANDLER_START()
@@ -121,9 +134,171 @@ FIQ_HANDLER_ENTRY(256, 512)
divisor = FIQ_DIVISOR_VIBRATOR;
}
- /* TODO: HDQ servicing */
+#ifdef CONFIG_GTA02_HDQ
+ /* HDQ servicing */
+
+ switch (hdq_state) {
+ case HDQB_IDLE:
+ if (fiq_ipc.hdq_request_ctr == fiq_ipc.hdq_transaction_ctr)
+ break;
+ hdq_ctr = 210 / HDQ_SAMPLE_PERIOD_US;
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 0);
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_OUTPUT);
+ hdq_tx_data_done = 0;
+ hdq_state = HDQB_TX_BREAK;
+ break;
+
+ case HDQB_TX_BREAK: /* issue low for > 190us */
+ if (--hdq_ctr == 0) {
+ hdq_ctr = 60 / HDQ_SAMPLE_PERIOD_US;
+ hdq_state = HDQB_TX_BREAK_RECOVERY;
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 1);
+ }
+ break;
+
+ case HDQB_TX_BREAK_RECOVERY: /* issue low for > 40us */
+ if (--hdq_ctr)
+ break;
+ hdq_shifter = fiq_ipc.hdq_ads;
+ hdq_bit = 8; /* 8 bits of ads / rw */
+ hdq_tx_data_done = 0; /* doing ads */
+ /* fallthru on last one */
+ case HDQB_ADS_CALC:
+ if (hdq_shifter & 1)
+ hdq_ctr = 50 / HDQ_SAMPLE_PERIOD_US;
+ else
+ hdq_ctr = 120 / HDQ_SAMPLE_PERIOD_US;
+ /* carefully precompute the other phase length */
+ hdq_ctr2 = (210 - (hdq_ctr * HDQ_SAMPLE_PERIOD_US)) /
+ HDQ_SAMPLE_PERIOD_US;
+ hdq_state = HDQB_ADS_LOW;
+ hdq_shifter >>= 1;
+ hdq_bit--;
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 0);
+ break;
+
+ case HDQB_ADS_LOW:
+ if (--hdq_ctr)
+ break;
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 1);
+ hdq_state = HDQB_ADS_HIGH;
+ break;
+
+ case HDQB_ADS_HIGH:
+ if (--hdq_ctr2 > 1) /* account for HDQB_ADS_CALC */
+ break;
+ if (hdq_bit) { /* more bits to do */
+ hdq_state = HDQB_ADS_CALC;
+ break;
+ }
+ /* no more bits, wait it out until hdq_ctr2 exhausted */
+ if (hdq_ctr2)
+ break;
+ /* ok no more bits and very last state */
+ hdq_ctr = 60 / HDQ_SAMPLE_PERIOD_US;
+ /* FIXME 0 = read */
+ if (fiq_ipc.hdq_ads & 0x80) { /* write the byte out */
+ /* set delay before payload */
+ hdq_ctr = 300 / HDQ_SAMPLE_PERIOD_US;
+ /* already high, no need to write */
+ hdq_state = HDQB_WAIT_TX;
+ break;
+ }
+ /* read the next byte */
+ hdq_bit = 8; /* 8 bits of data */
+ hdq_ctr = 3000 / HDQ_SAMPLE_PERIOD_US;
+ hdq_state = HDQB_WAIT_RX;
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_INPUT);
+ break;
+
+ case HDQB_WAIT_TX: /* issue low for > 40us */
+ if (--hdq_ctr)
+ break;
+ if (!hdq_tx_data_done) { /* was that the data sent? */
+ hdq_tx_data_done++;
+ hdq_shifter = fiq_ipc.hdq_tx_data;
+ hdq_bit = 8; /* 8 bits of data */
+ hdq_state = HDQB_ADS_CALC; /* start sending */
+ break;
+ }
+ fiq_ipc.hdq_error = 0;
+ fiq_ipc.hdq_transaction_ctr++;
+ hdq_state = HDQB_IDLE; /* all tx is done */
+ /* idle in input mode, it's pulled up by 10K */
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_INPUT);
+ break;
+
+ case HDQB_WAIT_RX: /* wait for battery to talk to us */
+ if (s3c2410_gpio_getpin(fiq_ipc.hdq_gpio_pin) == 0) {
+ /* it talks to us! */
+ hdq_ctr2 = 1;
+ hdq_bit = 8; /* 8 bits of data */
+ /* timeout */
+ hdq_ctr = 300 / HDQ_SAMPLE_PERIOD_US;
+ hdq_state = HDQB_DATA_RX_LOW;
+ break;
+ }
+ if (--hdq_ctr == 0) { /* timed out, error */
+ fiq_ipc.hdq_error = 1;
+ fiq_ipc.hdq_transaction_ctr++;
+ hdq_state = HDQB_IDLE; /* abort */
+ }
+ break;
+
+ /*
+ * HDQ basically works by measuring the low time of the bit cell
+ * 32-50us --> '1', 80 - 145us --> '0'
+ */
+
+ case HDQB_DATA_RX_LOW:
+ if (s3c2410_gpio_getpin(fiq_ipc.hdq_gpio_pin)) {
+ fiq_ipc.hdq_rx_data >>= 1;
+ if (hdq_ctr2 <= (65 / HDQ_SAMPLE_PERIOD_US))
+ fiq_ipc.hdq_rx_data |= 0x80;
+
+ if (--hdq_bit == 0) {
+ fiq_ipc.hdq_error = 0;
+ fiq_ipc.hdq_transaction_ctr++; /* done */
+ hdq_state = HDQB_IDLE;
+ } else
+ hdq_state = HDQB_DATA_RX_HIGH;
+ /* timeout */
+ hdq_ctr = 1000 / HDQ_SAMPLE_PERIOD_US;
+ hdq_ctr2 = 1;
+ break;
+ }
+ hdq_ctr2++;
+ if (--hdq_ctr)
+ break;
+ /* timed out, error */
+ fiq_ipc.hdq_error = 2;
+ fiq_ipc.hdq_transaction_ctr++;
+ hdq_state = HDQB_IDLE; /* abort */
+ break;
+ case HDQB_DATA_RX_HIGH:
+ if (!s3c2410_gpio_getpin(fiq_ipc.hdq_gpio_pin)) {
+ /* it talks to us! */
+ hdq_ctr2 = 1;
+ /* timeout */
+ hdq_ctr = 400 / HDQ_SAMPLE_PERIOD_US;
+ hdq_state = HDQB_DATA_RX_LOW;
+ break;
+ }
+ if (--hdq_ctr)
+ break;
+ /* timed out, error */
+ fiq_ipc.hdq_error = 3;
+ fiq_ipc.hdq_transaction_ctr++;
+ /* we're in input mode already */
+ hdq_state = HDQB_IDLE; /* abort */
+ break;
+ }
+ if (hdq_state != HDQB_IDLE) /* ie, not idle */
+ if (divisor > FIQ_DIVISOR_HDQ)
+ divisor = FIQ_DIVISOR_HDQ; /* keep us going */
+#endif
/* disable further timer interrupts if nobody has any work
* or adjust rate according to who still has work
@@ -391,6 +566,23 @@ struct platform_device sc32440_fiq_device = {
.resource = sc32440_fiq_resources,
};
+#ifdef CONFIG_GTA02_HDQ
+/* HDQ */
+
+static struct resource gta02_hdq_resources[] = {
+ [0] = {
+ .start = GTA02v5_GPIO_HDQ,
+ .end = GTA02v5_GPIO_HDQ,
+ },
+};
+
+struct platform_device gta02_hdq_device = {
+ .name = "gta02-hdq",
+ .num_resources = 1,
+ .resource = gta02_hdq_resources,
+};
+#endif
+
/* NOR Flash */
#define GTA02_FLASH_BASE 0x18000000 /* GCS3 */
@@ -1074,6 +1266,16 @@ static void __init gta02_machine_init(void)
platform_add_devices(gta02_devices, ARRAY_SIZE(gta02_devices));
+#ifdef CONFIG_GTA02_HDQ
+ switch (system_rev) {
+ case GTA02v5_SYSTEM_REV:
+ case GTA02v6_SYSTEM_REV:
+ platform_device_register(&gta02_hdq_device);
+ break;
+ default:
+ break;
+ }
+#endif
s3c2410_pm_init();
/* Set LCD_RESET / XRES to high */
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 58c806e..0a4515d 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -50,3 +50,11 @@ config BATTERY_OLPC
Say Y to enable support for the battery on the OLPC laptop.
endif # POWER_SUPPLY
+
+config GTA02_HDQ
+ tristate "Neo Freerunner HDQ"
+ depends on MACH_NEO1973_GTA02 && FIQ && S3C2440_C_FIQ
+ help
+ Say Y to enable support for communicating with an HDQ battery
+ on the Neo Freerunner. You probably want to select
+ at least BATTERY_BQ27000_HDQ as well
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 6413ded..88f227f 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -20,3 +20,5 @@ obj-$(CONFIG_APM_POWER) += apm_power.o
obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
+
+obj-$(CONFIG_GTA02_HDQ) += gta02_hdq.o
diff --git a/drivers/power/gta02_hdq.c b/drivers/power/gta02_hdq.c
new file mode 100644
index 0000000..12c742e
--- /dev/null
+++ b/drivers/power/gta02_hdq.c
@@ -0,0 +1,250 @@
+/*
+ * HDQ driver for the FIC Neo1973 GTA02 GSM phone
+ *
+ * (C) 2006-2007 by OpenMoko, Inc.
+ * Author: Andy Green <andy@openmoko.com>
+ * All rights reserved.
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/arch/gta02.h>
+#include <asm/arch/fiq_ipc_gta02.h>
+
+
+
+#define HDQ_READ 0
+#define HDQ_WRITE 0x80
+
+
+int gta02hdq_initialized(void)
+{
+ return fiq_ipc.hdq_probed;
+}
+EXPORT_SYMBOL_GPL(gta02hdq_initialized);
+
+int gta02hdq_read(int address)
+{
+ int count_sleeps = 5;
+ int ret = -ETIME;
+
+ mutex_lock(&fiq_ipc.hdq_lock);
+
+ fiq_ipc.hdq_ads = address | HDQ_READ;
+ fiq_ipc.hdq_request_ctr++;
+ fiq_kick();
+ /*
+ * FIQ takes care of it while we block our calling process
+ * But we're not spinning -- other processes run normally while
+ * we wait for the result
+ */
+ while (count_sleeps--) {
+ msleep(10); /* valid transaction always completes in < 10ms */
+
+ if (fiq_ipc.hdq_request_ctr != fiq_ipc.hdq_transaction_ctr)
+ continue;
+
+ if (fiq_ipc.hdq_error)
+ goto done; /* didn't see a response in good time */
+
+ ret = fiq_ipc.hdq_rx_data;
+ goto done;
+ }
+ ret = -EINVAL;
+
+done:
+ mutex_unlock(&fiq_ipc.hdq_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gta02hdq_read);
+
+int gta02hdq_write(int address, u8 data)
+{
+ int count_sleeps = 5;
+ int ret = -ETIME;
+
+ mutex_lock(&fiq_ipc.hdq_lock);
+
+ fiq_ipc.hdq_ads = address | HDQ_WRITE;
+ fiq_ipc.hdq_tx_data = data;
+ fiq_ipc.hdq_request_ctr++;
+ fiq_kick();
+ /*
+ * FIQ takes care of it while we block our calling process
+ * But we're not spinning -- other processes run normally while
+ * we wait for the result
+ */
+ while (count_sleeps--) {
+ msleep(10); /* valid transaction always completes in < 10ms */
+
+ if (fiq_ipc.hdq_request_ctr != fiq_ipc.hdq_transaction_ctr)
+ continue; /* something bad with FIQ */
+
+ if (fiq_ipc.hdq_error)
+ goto done; /* didn't see a response in good time */
+ }
+ ret = -EINVAL;
+
+done:
+ mutex_unlock(&fiq_ipc.hdq_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gta02hdq_write);
+
+/* sysfs */
+
+static ssize_t hdq_sysfs_dump(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int n;
+ int v;
+ u8 u8a[128]; /* whole address space for HDQ */
+ char *end = buf;
+
+ /* the dump does not take care about 16 bit regs, because at this
+ * bus level we don't know about the chip details
+ */
+ for (n = 0; n < sizeof(u8a); n++) {
+ v = gta02hdq_read(n);
+ if (v < 0)
+ goto bail;
+ u8a[n] = v;
+ }
+
+ for (n = 0; n < sizeof(u8a); n += 16) {
+ hex_dump_to_buffer(u8a + n, sizeof(u8a), 16, 1, end, 4096, 0);
+ end += strlen(end);
+ *end++ = '\n';
+ *end = '\0';
+ }
+ return (end - buf);
+
+bail:
+ return sprintf(buf, "ERROR %d\n", v);
+}
+
+/* you write by <address> <data>, eg, "34 128" */
+
+#define atoi(str) simple_strtoul(((str != NULL) ? str : ""), NULL, 0)
+
+static ssize_t hdq_sysfs_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ const char *end = buf + count;
+ int address = atoi(buf);
+
+ while ((buf != end) && (*buf != ' '))
+ buf++;
+ if (buf >= end)
+ return 0;
+ while ((buf < end) && (*buf == ' '))
+ buf++;
+ if (buf >= end)
+ return 0;
+
+ gta02hdq_write(address, atoi(buf));
+
+ return count;
+}
+
+static DEVICE_ATTR(dump, 0400, hdq_sysfs_dump, NULL);
+static DEVICE_ATTR(write, 0600, NULL, hdq_sysfs_write);
+
+static struct attribute *gta02hdq_sysfs_entries[] = {
+ &dev_attr_dump.attr,
+ &dev_attr_write.attr,
+ NULL
+};
+
+static struct attribute_group gta02hdq_attr_group = {
+ .name = "hdq",
+ .attrs = gta02hdq_sysfs_entries,
+};
+
+
+#ifdef CONFIG_PM
+static int gta02hdq_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ /* after 18s of this, the battery monitor will also go to sleep */
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 0);
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_OUTPUT);
+ return 0;
+}
+
+static int gta02hdq_resume(struct platform_device *pdev)
+{
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 1);
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_OUTPUT);
+ return 0;
+}
+#endif
+
+static int __init gta02hdq_probe(struct platform_device *pdev)
+{
+ struct resource *r = platform_get_resource(pdev, 0, 0);
+
+ if (!machine_is_neo1973_gta02())
+ return -EIO;
+
+ if (!r)
+ return -EINVAL;
+
+ platform_set_drvdata(pdev, NULL);
+
+ mutex_init(&fiq_ipc.hdq_lock);
+
+ /* set our HDQ comms pin from the platform data */
+ fiq_ipc.hdq_gpio_pin = r->start;
+
+ s3c2410_gpio_setpin(fiq_ipc.hdq_gpio_pin, 1);
+ s3c2410_gpio_cfgpin(fiq_ipc.hdq_gpio_pin, S3C2410_GPIO_OUTPUT);
+
+ fiq_ipc.hdq_probed = 1; /* we are ready to do stuff now */
+
+ return sysfs_create_group(&pdev->dev.kobj, &gta02hdq_attr_group);
+}
+
+static int gta02hdq_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &gta02hdq_attr_group);
+ return 0;
+}
+
+static struct platform_driver gta02hdq_driver = {
+ .probe = gta02hdq_probe,
+ .remove = gta02hdq_remove,
+#ifdef CONFIG_PM
+ .suspend = gta02hdq_suspend,
+ .resume = gta02hdq_resume,
+#endif
+ .driver = {
+ .name = "gta02-hdq",
+ },
+};
+
+static int __init gta02hdq_init(void)
+{
+ return platform_driver_register(&gta02hdq_driver);
+}
+
+static void __exit gta02hdq_exit(void)
+{
+ platform_driver_unregister(&gta02hdq_driver);
+}
+
+module_init(gta02hdq_init);
+module_exit(gta02hdq_exit);
+
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
+MODULE_DESCRIPTION("GTA02 HDQ driver");
+MODULE_LICENSE("GPL");
diff --git a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
index 507d235..c5eb3df 100644
--- a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
+++ b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
@@ -19,12 +19,35 @@
#include <asm/arch/pwm.h>
#include <asm/plat-s3c/regs-timer.h>
+enum hdq_bitbang_states {
+ HDQB_IDLE = 0,
+ HDQB_TX_BREAK,
+ HDQB_TX_BREAK_RECOVERY,
+ HDQB_ADS_CALC,
+ HDQB_ADS_LOW,
+ HDQB_ADS_HIGH,
+ HDQB_WAIT_RX,
+ HDQB_DATA_RX_LOW,
+ HDQB_DATA_RX_HIGH,
+ HDQB_WAIT_TX,
+};
struct fiq_ipc {
/* vibrator */
unsigned long vib_gpio_pin; /* which pin to meddle with */
u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
u8 vib_pwm_latched;
+
+ /* hdq */
+ u8 hdq_probed; /* nonzero after HDQ driver probed */
+ struct mutex hdq_lock; /* if you want to use hdq, you have to take lock */
+ unsigned long hdq_gpio_pin; /* GTA02 = GPD14 which pin to meddle with */
+ u8 hdq_ads; /* b7..b6 = register address, b0 = r/w */
+ u8 hdq_tx_data; /* data to tx for write action */
+ u8 hdq_rx_data; /* data received in read action */
+ u8 hdq_request_ctr; /* incremented by "user" to request a transfer */
+ u8 hdq_transaction_ctr; /* incremented after each transfer */
+ u8 hdq_error; /* 0 = no error */
};
/* actual definition lives in arch/arm/mach-s3c2440/fiq_c_isr.c */
diff --git a/include/asm-arm/arch-s3c2410/gta02.h b/include/asm-arm/arch-s3c2410/gta02.h
index fa49d93..f686a7a 100644
--- a/include/asm-arm/arch-s3c2410/gta02.h
+++ b/include/asm-arm/arch-s3c2410/gta02.h
@@ -37,6 +37,7 @@
#define GTA02v3_GPIO_nG1_CS S3C2410_GPD12 /* v3 + v4 only */
#define GTA02v3_GPIO_nG2_CS S3C2410_GPD13 /* v3 + v4 only */
+#define GTA02v5_GPIO_HDQ S3C2410_GPD14 /* v5 + */
#define GTA02_GPIO_nG1_INT S3C2410_GPF0
#define GTA02_GPIO_IO1 S3C2410_GPF1
diff --git a/include/linux/gta02_hdq.h b/include/linux/gta02_hdq.h
new file mode 100644
index 0000000..2f43a62
--- /dev/null
+++ b/include/linux/gta02_hdq.h
@@ -0,0 +1,8 @@
+#ifndef __GTA02HDQ_H__
+#define __GTA02HDQ_H__
+
+int gta02hdq_read(int address);
+int gta02hdq_write(int address, u8 data);
+int gta02hdq_initialized(void);
+
+#endif
--
1.5.6.3
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