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fsi: master-gpio: Add support for link_config 

To configure the send and echo delays

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
hifive-unleashed-5.1
Benjamin Herrenschmidt 2018-05-29 15:11:32 +10:00
parent edc2485148
commit 75854c148f
1 changed files with 25 additions and 2 deletions
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27
drivers/fsi/fsi-master-gpio.c
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@ -64,6 +64,8 @@ struct fsi_master_gpio {
bool external_mode;
bool no_delays;
uint32_t last_addr;
uint8_t t_send_delay;
uint8_t t_echo_delay;
};
#define CREATE_TRACE_POINTS
@ -338,7 +340,7 @@ static void build_epoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
static void echo_delay(struct fsi_master_gpio *master)
{
set_sda_output(master, 1);
clock_toggle(master, FSI_ECHO_DELAY_CLOCKS);
clock_toggle(master, master->t_echo_delay);
}
static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
@ -540,7 +542,7 @@ retry:
* from receive of response back to send of data.
*/
local_irq_save(flags);
clock_zeros(master, FSI_SEND_DELAY_CLOCKS);
clock_zeros(master, master->t_send_delay);
local_irq_restore(flags);
return rc;
@ -722,6 +724,22 @@ static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
return rc;
}
static int fsi_master_gpio_link_config(struct fsi_master *_master, int link,
u8 t_send_delay, u8 t_echo_delay)
{
struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
if (link != 0)
return -ENODEV;
mutex_lock(&master->cmd_lock);
master->t_send_delay = t_send_delay;
master->t_echo_delay = t_echo_delay;
mutex_unlock(&master->cmd_lock);
return 0;
}
static ssize_t external_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -826,6 +844,10 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
*/
master->no_delays = device_property_present(&pdev->dev, "no-gpio-delays");
/* Default FSI command delays */
master->t_send_delay = FSI_SEND_DELAY_CLOCKS;
master->t_echo_delay = FSI_ECHO_DELAY_CLOCKS;
master->master.n_links = 1;
master->master.flags = FSI_MASTER_FLAG_SWCLOCK;
master->master.read = fsi_master_gpio_read;
@ -833,6 +855,7 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
master->master.term = fsi_master_gpio_term;
master->master.send_break = fsi_master_gpio_break;
master->master.link_enable = fsi_master_gpio_link_enable;
master->master.link_config = fsi_master_gpio_link_config;
platform_set_drvdata(pdev, master);
mutex_init(&master->cmd_lock);