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gpio: stp-xway: automatically drive GPHY leds on ar10 and grx390

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Ar10 (xr300) has 3 and grx390 (xrx330) has 4 built-in GPHY. PHY LEDs are
connected via STP. STP is a peripheral controller used to drive external
shift register cascades. The hardware is able to allow the GPHY to drive
some GPIO of the cascade automatically.This patch allows for this on ar10
and grx390.

Tested on D-Link DWR-966 with OpenWRT.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Aleksander Jan Bajkowski 2020-08-14 21:48:47 +02:00 committed by Bartosz Golaszewski
parent 9123e3a74e
commit 329afb94e0
1 changed files with 48 additions and 6 deletions
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52
drivers/gpio/gpio-stp-xway.c
View File

@ -41,7 +41,10 @@
#define XWAY_STP_4HZ BIT(23)
#define XWAY_STP_8HZ BIT(24)
#define XWAY_STP_10HZ (BIT(24) | BIT(23))
#define XWAY_STP_SPEED_MASK (0xf << 23)
#define XWAY_STP_SPEED_MASK (BIT(23) | BIT(24) | BIT(25) | BIT(26) | BIT(27))
#define XWAY_STP_FPIS_VALUE BIT(21)
#define XWAY_STP_FPIS_MASK (BIT(20) | BIT(21))
/* clock source for automatic update */
#define XWAY_STP_UPD_FPI BIT(31)
@ -54,7 +57,9 @@
/* 2 groups of 3 bits can be driven by the phys */
#define XWAY_STP_PHY_MASK 0x7
#define XWAY_STP_PHY1_SHIFT 27
#define XWAY_STP_PHY2_SHIFT 15
#define XWAY_STP_PHY2_SHIFT 3
#define XWAY_STP_PHY3_SHIFT 6
#define XWAY_STP_PHY4_SHIFT 15
/* STP has 3 groups of 8 bits */
#define XWAY_STP_GROUP0 BIT(0)
@ -80,6 +85,8 @@ struct xway_stp {
u8 dsl; /* the 2 LSBs can be driven by the dsl core */
u8 phy1; /* 3 bits can be driven by phy1 */
u8 phy2; /* 3 bits can be driven by phy2 */
u8 phy3; /* 3 bits can be driven by phy3 */
u8 phy4; /* 3 bits can be driven by phy4 */
u8 reserved; /* mask out the hw driven bits in gpio_request */
};
@ -114,6 +121,7 @@ static void xway_stp_set(struct gpio_chip *gc, unsigned gpio, int val)
else
chip->shadow &= ~BIT(gpio);
xway_stp_w32(chip->virt, chip->shadow, XWAY_STP_CPU0);
if (!chip->reserved)
xway_stp_w32_mask(chip->virt, 0, XWAY_STP_CON_SWU, XWAY_STP_CON0);
}
@ -188,16 +196,37 @@ static void xway_stp_hw_init(struct xway_stp *chip)
chip->phy2 << XWAY_STP_PHY2_SHIFT,
XWAY_STP_CON1);
if (of_machine_is_compatible("lantiq,grx390")
|| of_machine_is_compatible("lantiq,ar10")) {
xway_stp_w32_mask(chip->virt,
XWAY_STP_PHY_MASK << XWAY_STP_PHY3_SHIFT,
chip->phy3 << XWAY_STP_PHY3_SHIFT,
XWAY_STP_CON1);
}
if (of_machine_is_compatible("lantiq,grx390")) {
xway_stp_w32_mask(chip->virt,
XWAY_STP_PHY_MASK << XWAY_STP_PHY4_SHIFT,
chip->phy4 << XWAY_STP_PHY4_SHIFT,
XWAY_STP_CON1);
}
/* mask out the hw driven bits in gpio_request */
chip->reserved = (chip->phy2 << 5) | (chip->phy1 << 2) | chip->dsl;
chip->reserved = (chip->phy4 << 11) | (chip->phy3 << 8) | (chip->phy2 << 5)
| (chip->phy1 << 2) | chip->dsl;
/*
* if we have pins that are driven by hw, we need to tell the stp what
* clock to use as a timer.
*/
if (chip->reserved)
if (chip->reserved) {
xway_stp_w32_mask(chip->virt, XWAY_STP_UPD_MASK,
XWAY_STP_UPD_FPI, XWAY_STP_CON1);
xway_stp_w32_mask(chip->virt, XWAY_STP_SPEED_MASK,
XWAY_STP_10HZ, XWAY_STP_CON1);
xway_stp_w32_mask(chip->virt, XWAY_STP_FPIS_MASK,
XWAY_STP_FPIS_VALUE, XWAY_STP_CON1);
}
}
static int xway_stp_probe(struct platform_device *pdev)
@ -242,13 +271,26 @@ static int xway_stp_probe(struct platform_device *pdev)
/* find out which gpios are controlled by the phys */
if (of_machine_is_compatible("lantiq,ar9") ||
of_machine_is_compatible("lantiq,gr9") ||
of_machine_is_compatible("lantiq,vr9")) {
of_machine_is_compatible("lantiq,vr9") ||
of_machine_is_compatible("lantiq,ar10") ||
of_machine_is_compatible("lantiq,grx390")) {
if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy1", &phy))
chip->phy1 = phy & XWAY_STP_PHY_MASK;
if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy2", &phy))
chip->phy2 = phy & XWAY_STP_PHY_MASK;
}
if (of_machine_is_compatible("lantiq,ar10") ||
of_machine_is_compatible("lantiq,grx390")) {
if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy3", &phy))
chip->phy3 = phy & XWAY_STP_PHY_MASK;
}
if (of_machine_is_compatible("lantiq,grx390")) {
if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy4", &phy))
chip->phy4 = phy & XWAY_STP_PHY_MASK;
}
/* check which edge trigger we should use, default to a falling edge */
if (!of_find_property(pdev->dev.of_node, "lantiq,rising", NULL))
chip->edge = XWAY_STP_FALLING;