power: reset: linkstation-poweroff: add new device

This commit introduces support for NETGEAR ReadyNAS Duo v2.
This device use bit 4 of LED[2:0] Polarity Control Register to indicate
AC Power loss.

For more details about AC loss detection in NETGEAR ReadyNAS Duo v2,
please look at the file:
RND_5.3.13_WW.src/u-boot/board/mv_feroceon/mv_hal/usibootup/usibootup.c
from Netgear GPL sources.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/reset/linkstation-poweroff.c b/drivers/power/reset/linkstation-poweroff.c
index cb5a32f..02f5fdb 100644 (file)
--- a/drivers/power/reset/linkstation-poweroff.c
+++ b/drivers/power/reset/linkstation-poweroff.c
@@ -19,6 +19,7 @@
 #define MII_MARVELL_PHY_PAGE           22
 
 #define MII_PHY_LED_CTRL               16
+#define MII_PHY_LED_POL_CTRL           17
 #define MII_88E1318S_PHY_LED_TCR       18
 #define MII_88E1318S_PHY_WOL_CTRL      16
 #define MII_M1011_IEVENT               19
@@ -29,6 +30,8 @@
 #define LED2_FORCE_ON                                  (0x8 << 8)
 #define LEDMASK                                                GENMASK(11,8)
 
+#define MII_88E1318S_PHY_LED_POL_LED2          BIT(4)
+
 struct power_off_cfg {
        char *mdio_node_name;
        void (*phy_set_reg)(bool restart);
@@ -76,11 +79,47 @@ err:
                dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);
 }
 
+static void readynas_mvphy_set_reg(bool restart)
+{
+       int rc = 0, saved_page;
+       u16 data = 0;
+
+       if (restart)
+               data = MII_88E1318S_PHY_LED_POL_LED2;
+
+       saved_page = phy_select_page(phydev, MII_MARVELL_LED_PAGE);
+       if (saved_page < 0)
+               goto err;
+
+       /* Set the LED[2].0 Polarity bit to the required state */
+       __phy_modify(phydev, MII_PHY_LED_POL_CTRL,
+                    MII_88E1318S_PHY_LED_POL_LED2, data);
+
+       if (!data) {
+               /* If WOL was enabled and a magic packet was received before powering
+                * off, we won't be able to wake up by sending another magic packet.
+                * Clear WOL status.
+                */
+               __phy_write(phydev, MII_MARVELL_PHY_PAGE, MII_MARVELL_WOL_PAGE);
+               __phy_set_bits(phydev, MII_88E1318S_PHY_WOL_CTRL,
+                              MII_88E1318S_PHY_WOL_CTRL_CLEAR_WOL_STATUS);
+       }
+err:
+       rc = phy_restore_page(phydev, saved_page, rc);
+       if (rc < 0)
+               dev_err(&phydev->mdio.dev, "Write register failed, %d\n", rc);
+}
+
 static const struct power_off_cfg linkstation_power_off_cfg = {
        .mdio_node_name = "mdio",
        .phy_set_reg = linkstation_mvphy_reg_intn,
 };
 
+static const struct power_off_cfg readynas_power_off_cfg = {
+       .mdio_node_name = "mdio-bus",
+       .phy_set_reg = readynas_mvphy_set_reg,
+};
+
 static int linkstation_reboot_notifier(struct notifier_block *nb,
                                       unsigned long action, void *unused)
 {
@@ -109,6 +148,9 @@ static const struct of_device_id ls_poweroff_of_match[] = {
        { .compatible = "buffalo,ls421de",
          .data = &linkstation_power_off_cfg,
        },
+       { .compatible = "netgear,readynas-duo-v2",
+         .data = &readynas_power_off_cfg,
+       },
        { },
 };