140 lines
4.5 KiB
Diff
140 lines
4.5 KiB
Diff
From 612e1c86f4d7a94797838d50f5bf7b760affad06 Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megous@megous.com>
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Date: Thu, 17 Sep 2020 00:10:50 +0200
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Subject: [PATCH 268/478] misc: modem-power: Add fastboot powerup mode
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This may work with a patched bootloader from https://github.com/Biktorgj
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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drivers/misc/modem-power.c | 53 +++++++++++++++++++++++++++++++++++---
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1 file changed, 50 insertions(+), 3 deletions(-)
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diff --git a/drivers/misc/modem-power.c b/drivers/misc/modem-power.c
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index 1a1ba4bf7841..aee4479b0d6a 100644
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--- a/drivers/misc/modem-power.c
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+++ b/drivers/misc/modem-power.c
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@@ -178,6 +178,7 @@ enum {
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MPWR_F_GOT_PDN,
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/* config options */
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MPWR_F_DUMB_POWERUP,
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+ MPWR_F_FASTBOOT_POWERUP,
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/* file */
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MPWR_F_OPEN,
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MPWR_F_OVERFLOW,
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@@ -386,11 +387,13 @@ static int mpwr_eg25_power_up(struct mpwr_dev* mpwr)
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{
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struct gpio_desc *pwrkey_gpio = mpwr_eg25_get_pwrkey_gpio(mpwr);
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bool wakeup_ok, status_ok;
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- bool needs_restart = false;
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+ bool needs_restart = false, fastboot;
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u32 speed = 115200;
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int ret, i, off;
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ktime_t start;
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+ fastboot = test_and_clear_bit(MPWR_F_FASTBOOT_POWERUP, mpwr->flags);
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+
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if (regulator_is_enabled(mpwr->regulator))
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dev_warn(mpwr->dev,
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"regulator was already enabled during powerup");
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@@ -405,7 +408,14 @@ static int mpwr_eg25_power_up(struct mpwr_dev* mpwr)
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/* Drive default gpio signals during powerup */
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gpiod_direction_output(mpwr->host_ready_gpio, 1);
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- gpiod_direction_output(mpwr->enable_gpio, 1);
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+ /* #W_DISABLE must be left pulled up during modem power up
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+ * early on, because opensource bootloader uses this signal to enter
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+ * fastboot mode when it's pulled down.
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+ *
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+ * This should be 1 for normal powerup and 0 for fastboot mode with
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+ * special Biktor's firmware.
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+ */
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+ gpiod_direction_output(mpwr->enable_gpio, !fastboot);
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gpiod_direction_output(mpwr->sleep_gpio, 0);
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gpiod_direction_output(mpwr->reset_gpio, 0);
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gpiod_direction_output(pwrkey_gpio, 0);
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@@ -419,6 +429,10 @@ static int mpwr_eg25_power_up(struct mpwr_dev* mpwr)
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msleep(200);
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gpiod_set_value(pwrkey_gpio, 0);
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+ /* skip modem killswitch status checks in fastboot bootloader entry mode */
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+ if (fastboot)
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+ goto open_serdev;
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+
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/* Switch status key to input, in case it's multiplexed with pwrkey. */
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gpiod_direction_input(mpwr->status_gpio);
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@@ -464,6 +478,7 @@ static int mpwr_eg25_power_up(struct mpwr_dev* mpwr)
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if (test_and_clear_bit(MPWR_F_KILLSWITCHED, mpwr->flags))
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sysfs_notify(&mpwr->dev->kobj, NULL, "killswitched");
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+open_serdev:
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/* open serial console */
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ret = serdev_device_open(mpwr->serdev);
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if (ret) {
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@@ -480,7 +495,7 @@ static int mpwr_eg25_power_up(struct mpwr_dev* mpwr)
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goto err_shutdown;
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}
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- if (test_bit(MPWR_F_DUMB_POWERUP, mpwr->flags))
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+ if (test_bit(MPWR_F_DUMB_POWERUP, mpwr->flags) || fastboot)
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goto powered_up;
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ret = mpwr_serdev_at_cmd_with_retry_ignore_timeout(mpwr, "AT&FE0", 1000, 30);
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@@ -1230,6 +1245,36 @@ static ssize_t dumb_powerup_store(struct device *dev,
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return len;
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}
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+static ssize_t fastboot_powerup_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct mpwr_dev *mpwr = platform_get_drvdata(to_platform_device(dev));
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+
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+ return scnprintf(buf, PAGE_SIZE, "%u\n",
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+ !!test_bit(MPWR_F_FASTBOOT_POWERUP, mpwr->flags));
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+}
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+
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+static ssize_t fastboot_powerup_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t len)
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+{
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+ struct mpwr_dev *mpwr = platform_get_drvdata(to_platform_device(dev));
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+ bool val;
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+ int ret;
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+
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+ ret = kstrtobool(buf, &val);
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+ if (ret)
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+ return ret;
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+
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+ if (val) {
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+ dev_warn(mpwr->dev, "Fastboot powerup needs a special bootloader!\n");
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+ set_bit(MPWR_F_FASTBOOT_POWERUP, mpwr->flags);
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+ } else
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+ clear_bit(MPWR_F_FASTBOOT_POWERUP, mpwr->flags);
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+
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+ return len;
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+}
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+
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static ssize_t killswitched_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@@ -1268,6 +1313,7 @@ static ssize_t hard_reset_store(struct device *dev,
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static DEVICE_ATTR_RW(powered);
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static DEVICE_ATTR_WO(powered_blocking);
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static DEVICE_ATTR_RW(dumb_powerup);
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+static DEVICE_ATTR_RW(fastboot_powerup);
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static DEVICE_ATTR_RO(killswitched);
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static DEVICE_ATTR_RO(is_busy);
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static DEVICE_ATTR_WO(hard_reset);
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@@ -1276,6 +1322,7 @@ static struct attribute *mpwr_attrs[] = {
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&dev_attr_powered.attr,
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&dev_attr_powered_blocking.attr,
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&dev_attr_dumb_powerup.attr,
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+ &dev_attr_fastboot_powerup.attr,
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&dev_attr_killswitched.attr,
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&dev_attr_is_busy.attr,
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&dev_attr_hard_reset.attr,
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--
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2.35.3
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