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fsi: master-gpio: Add external mode

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This change introduces an 'external mode' for GPIO-based FSI masters,
allowing the clock and data lines to be driven by an external source.
For example, external mode is selected by a user when an external debug
device is attached to the FSI pins.

To do this, we need to set specific states for the trans, mux and enable
GPIOs, and prevent access to clk & data from the FSI core code (by
returning EBUSY).

External mode is controlled by a sysfs attribute, so add the relevant
information to Documentation/ABI/

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Kerr 2018-02-12 15:45:42 +10:30 committed by Greg Kroah-Hartman
parent 29d9b92711
commit b8bd146d38
2 changed files with 86 additions and 2 deletions
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10
Documentation/ABI/testing/sysfs-driver-fsi-master-gpio Normal file
View File

@ -0,0 +1,10 @@
What: /sys/bus/platform/devices/[..]/fsi-master-gpio/external_mode
Date: Feb 2018
KernelVersion: 4.17
Contact: jk@ozlabs.org
Description:
Controls access arbitration for GPIO-based FSI master. A
value of 0 (the default) sets normal mode, where the
driver performs FSI bus transactions, 1 sets external mode,
where the FSI bus is driven externally (for example, by
a debug device).

78
drivers/fsi/fsi-master-gpio.c
View File

@ -59,6 +59,7 @@ struct fsi_master_gpio {
struct gpio_desc *gpio_trans; /* Voltage translator */
struct gpio_desc *gpio_enable; /* FSI enable */
struct gpio_desc *gpio_mux; /* Mux control */
bool external_mode;
};
#define CREATE_TRACE_POINTS
@ -411,6 +412,12 @@ static int fsi_master_gpio_xfer(struct fsi_master_gpio *master, uint8_t slave,
int rc;
spin_lock_irqsave(&master->cmd_lock, flags);
if (master->external_mode) {
spin_unlock_irqrestore(&master->cmd_lock, flags);
return -EBUSY;
}
serial_out(master, cmd);
echo_delay(master);
rc = poll_for_response(master, slave, resp_len, resp);
@ -469,6 +476,10 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link)
trace_fsi_master_gpio_break(master);
spin_lock_irqsave(&master->cmd_lock, flags);
if (master->external_mode) {
spin_unlock_irqrestore(&master->cmd_lock, flags);
return -EBUSY;
}
set_sda_output(master, 1);
sda_out(master, 1);
clock_toggle(master, FSI_PRE_BREAK_CLOCKS);
@ -497,25 +508,84 @@ static void fsi_master_gpio_init(struct fsi_master_gpio *master)
clock_zeros(master, FSI_INIT_CLOCKS);
}
static void fsi_master_gpio_init_external(struct fsi_master_gpio *master)
{
gpiod_direction_output(master->gpio_mux, 0);
gpiod_direction_output(master->gpio_trans, 0);
gpiod_direction_output(master->gpio_enable, 1);
gpiod_direction_input(master->gpio_clk);
gpiod_direction_input(master->gpio_data);
}
static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
{
struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
unsigned long flags;
int rc = -EBUSY;
if (link != 0)
return -ENODEV;
spin_lock_irqsave(&master->cmd_lock, flags);
gpiod_set_value(master->gpio_enable, 1);
if (!master->external_mode) {
gpiod_set_value(master->gpio_enable, 1);
rc = 0;
}
spin_unlock_irqrestore(&master->cmd_lock, flags);
return 0;
return rc;
}
static ssize_t external_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fsi_master_gpio *master = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE - 1, "%u\n",
master->external_mode ? 1 : 0);
}
static ssize_t external_mode_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct fsi_master_gpio *master = dev_get_drvdata(dev);
unsigned long flags, val;
bool external_mode;
int err;
err = kstrtoul(buf, 0, &val);
if (err)
return err;
external_mode = !!val;
spin_lock_irqsave(&master->cmd_lock, flags);
if (external_mode == master->external_mode) {
spin_unlock_irqrestore(&master->cmd_lock, flags);
return count;
}
master->external_mode = external_mode;
if (master->external_mode)
fsi_master_gpio_init_external(master);
else
fsi_master_gpio_init(master);
spin_unlock_irqrestore(&master->cmd_lock, flags);
fsi_master_rescan(&master->master);
return count;
}
static DEVICE_ATTR(external_mode, 0664,
external_mode_show, external_mode_store);
static int fsi_master_gpio_probe(struct platform_device *pdev)
{
struct fsi_master_gpio *master;
struct gpio_desc *gpio;
int rc;
master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
if (!master)
@ -572,6 +642,10 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
fsi_master_gpio_init(master);
rc = device_create_file(&pdev->dev, &dev_attr_external_mode);
if (rc)
return rc;
return fsi_master_register(&master->master);
}