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Date: Wed, 20 Nov 2019 12:29:42 +0000
From: Russell King - ARM Linux admin <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: sfp: soft status and control support
Sorry, sent the wrong version. Please disregard. Thanks.
On Wed, Nov 20, 2019 at 12:24:24PM +0000, Russell King wrote:
> Add support for the soft status and control register, which allows
> TX_FAULT and RX_LOS to be monitored and TX_DISABLE to be set. We
> make use of this when the board does not support GPIOs for these
> signals.
>
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> ---
> drivers/net/phy/sfp.c | 103 ++++++++++++++++++++++++++++++++++++------
> include/linux/sfp.h | 4 ++
> 2 files changed, 93 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 69bedef96ca7..93e82bf0239f 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -201,7 +201,10 @@ struct sfp {
> struct gpio_desc *gpio[GPIO_MAX];
> int gpio_irq[GPIO_MAX];
>
> + bool need_poll;
> +
> struct mutex st_mutex; /* Protects state */
> + unsigned int state_soft_mask;
> unsigned int state;
> struct delayed_work poll;
> struct delayed_work timeout;
> @@ -395,24 +398,90 @@ static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
> }
>
> /* Interface */
> -static unsigned int sfp_get_state(struct sfp *sfp)
> +static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
> {
> - return sfp->get_state(sfp);
> + return sfp->read(sfp, a2, addr, buf, len);
> }
>
> -static void sfp_set_state(struct sfp *sfp, unsigned int state)
> +static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
> {
> - sfp->set_state(sfp, state);
> + return sfp->write(sfp, a2, addr, buf, len);
> }
>
> -static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
> +static unsigned int sfp_soft_get_state(struct sfp *sfp)
> {
> - return sfp->read(sfp, a2, addr, buf, len);
> + unsigned int state = 0;
> + u8 status;
> +
> + if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
> + sizeof(status)) {
> + if (status & SFP_STATUS_RX_LOS)
> + state |= SFP_F_LOS;
> + if (status & SFP_STATUS_TX_FAULT)
> + state |= SFP_F_TX_FAULT;
> + }
> +
> + return state & sfp->state_soft_mask;
> }
>
> -static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
> +static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
> {
> - return sfp->write(sfp, a2, addr, buf, len);
> + u8 status;
> +
> + if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
> + sizeof(status)) {
> + if (state & SFP_F_TX_DISABLE)
> + status |= SFP_STATUS_TX_DISABLE_FORCE;
> + else
> + status &= ~SFP_STATUS_TX_DISABLE_FORCE;
> +
> + sfp_write(sfp, true, SFP_STATUS, &status, sizeof(status));
> + }
> +}
> +
> +static void sfp_soft_start_poll(struct sfp *sfp)
> +{
> + const struct sfp_eeprom_id *id = &sfp->id;
> +
> + sfp->state_soft_mask = 0;
> + if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE &&
> + !sfp->gpio[GPIO_TX_DISABLE])
> + sfp->state_soft_mask |= SFP_F_TX_DISABLE;
> + if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT &&
> + !sfp->gpio[GPIO_TX_FAULT])
> + sfp->state_soft_mask |= SFP_F_TX_FAULT;
> + if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS &&
> + !sfp->gpio[GPIO_LOS])
> + sfp->state_soft_mask |= SFP_F_LOS;
> +
> + if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
> + !sfp->need_poll)
> + mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
> +}
> +
> +static void sfp_soft_stop_poll(struct sfp *sfp)
> +{
> + sfp->state_soft_mask = 0;
> +}
> +
> +static unsigned int sfp_get_state(struct sfp *sfp)
> +{
> + unsigned int state = sfp->get_state(sfp);
> +
> + if (state & SFP_F_PRESENT &&
> + sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT))
> + state |= sfp_soft_get_state(sfp);
> +
> + return state;
> +}
> +
> +static void sfp_set_state(struct sfp *sfp, unsigned int state)
> +{
> + sfp->set_state(sfp, state);
> +
> + if (state & SFP_F_PRESENT &&
> + sfp->state_soft_mask & SFP_F_TX_DISABLE)
> + sfp_soft_set_state(sfp, state);
> }
>
> static unsigned int sfp_check(void *buf, size_t len)
> @@ -1346,6 +1415,9 @@ static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
>
> static void sfp_sm_mod_init(struct sfp *sfp)
> {
> + if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE))
> + sfp_soft_start_poll(sfp);
> +
> sfp_module_tx_enable(sfp);
> }
>
> @@ -1511,7 +1583,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
> (int)sizeof(id.ext.datecode), id.ext.datecode);
>
> /* Check whether we support this module */
> - if (!sfp->type->module_supported(&sfp->id)) {
> + if (!sfp->type->module_supported(&id)) {
> dev_err(sfp->dev,
> "module is not supported - phys id 0x%02x 0x%02x\n",
> sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
> @@ -1537,6 +1609,7 @@ static void sfp_sm_mod_remove(struct sfp *sfp)
> sfp_module_remove(sfp->sfp_bus);
>
> sfp_hwmon_remove(sfp);
> + sfp_soft_stop_poll(sfp);
>
> memset(&sfp->id, 0, sizeof(sfp->id));
> sfp->module_power_mW = 0;
> @@ -1968,7 +2041,10 @@ static void sfp_poll(struct work_struct *work)
> struct sfp *sfp = container_of(work, struct sfp, poll.work);
>
> sfp_check_state(sfp);
> - mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
> +
> + if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
> + sfp->need_poll)
> + mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
> }
>
> static struct sfp *sfp_alloc(struct device *dev)
> @@ -2013,7 +2089,6 @@ static int sfp_probe(struct platform_device *pdev)
> const struct sff_data *sff;
> struct i2c_adapter *i2c;
> struct sfp *sfp;
> - bool poll = false;
> int err, i;
>
> sfp = sfp_alloc(&pdev->dev);
> @@ -2120,7 +2195,7 @@ static int sfp_probe(struct platform_device *pdev)
>
> sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
> if (!sfp->gpio_irq[i]) {
> - poll = true;
> + sfp->need_poll = true;
> continue;
> }
>
> @@ -2132,11 +2207,11 @@ static int sfp_probe(struct platform_device *pdev)
> dev_name(sfp->dev), sfp);
> if (err) {
> sfp->gpio_irq[i] = 0;
> - poll = true;
> + sfp->need_poll = true;
> }
> }
>
> - if (poll)
> + if (sfp->need_poll)
> mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
>
> /* We could have an issue in cases no Tx disable pin is available or
> diff --git a/include/linux/sfp.h b/include/linux/sfp.h
> index 3b35efd85bb1..487fd9412d10 100644
> --- a/include/linux/sfp.h
> +++ b/include/linux/sfp.h
> @@ -428,6 +428,10 @@ enum {
> SFP_TEC_CUR = 0x6c,
>
> SFP_STATUS = 0x6e,
> + SFP_STATUS_TX_DISABLE = BIT(7),
> + SFP_STATUS_TX_DISABLE_FORCE = BIT(6),
> + SFP_STATUS_TX_FAULT = BIT(2),
> + SFP_STATUS_RX_LOS = BIT(1),
> SFP_ALARM0 = 0x70,
> SFP_ALARM0_TEMP_HIGH = BIT(7),
> SFP_ALARM0_TEMP_LOW = BIT(6),
> --
> 2.20.1
>
>
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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