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drivers/net/phy/m88e1512: Add downshift enable 

This patch provides the functionality to enable downshift on Marvell
PHY. By setting a downshift counter, the PHY is correspondingly often
attempted to establish Gigabit link before the PHY downshifts to the
next highest speed. The range is limited to 8 trials. To activate
downshift, a software reset must follow to take effect.

Change-Id: I4224eab6c1fc13824d53556c80435bc130a13bdb
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69853
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Mario Scheithauer 2022-11-21 16:22:03 +01:00 committed by Martin L Roth
parent e19f403770
commit 16dd1c31c2
3 changed files with 34 additions and 0 deletions
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3
src/drivers/net/phy/m88e1512/chip.h
View File

@ -8,4 +8,7 @@ struct drivers_net_phy_m88e1512_config {
unsigned char led_1_ctrl; /* LED[1] Control */
unsigned char led_2_ctrl; /* LED[2] Control */
bool enable_int; /* INTn can be routed to LED[2] pin */
/* 1x, 2x,...8x is the number of times the PHY attempts to establish Gigabit link
before the PHY downshifts to the next highest speed. */
unsigned char downshift_cnt;
};

22
src/drivers/net/phy/m88e1512/m88e1512.c
View File

@ -17,6 +17,28 @@ static void m88e1512_init(struct device *dev)
struct drivers_net_phy_m88e1512_config *config = dev->chip_info;
uint16_t reg;
/* Enable downshift. */
if (config->downshift_cnt) {
if (config->downshift_cnt > DOWNSHIFT_CNT_MAX) {
printk(BIOS_INFO, "%s: Downshift counter for %s is too large.\n",
dev_path(dev->bus->dev), dev->chip_ops->name);
} else {
printk(BIOS_DEBUG, "%s: Enable downshift after %d attempts for %s.\n",
dev_path(dev->bus->dev), config->downshift_cnt,
dev->chip_ops->name);
reg = mdio_read(dev, COPPER_SPEC_CTRL_REG_1);
clrsetbits16(&reg, DOWNSHIFT_CNT_MASK,
DOWNSHIFT_CNT(config->downshift_cnt) | DOWNSHIFT_EN);
mdio_write(dev, COPPER_SPEC_CTRL_REG_1, reg);
/* Downshift enable requires a software reset to take effect. */
reg = mdio_read(dev, COPPER_CTRL_REG);
setbits16(&reg, SOFTWARE_RESET);
mdio_write(dev, COPPER_CTRL_REG, reg);
}
}
/* Configure LEDs if requested. */
if (config->configure_leds) {
printk(BIOS_DEBUG, "%s: Set a customized LED mode for %s.\n",

9
src/drivers/net/phy/m88e1512/m88e1512.h
View File

@ -5,6 +5,15 @@
/* Register layout */
#define PAGE_REG 0x16
/* Page 0 registers */
#define COPPER_CTRL_REG 0
#define SOFTWARE_RESET (1 << 15)
#define COPPER_SPEC_CTRL_REG_1 0x10
#define DOWNSHIFT_CNT_MASK 0x7000
#define DOWNSHIFT_CNT_MAX 8
#define DOWNSHIFT_CNT(cnt) ((cnt - 1) << 12)
#define DOWNSHIFT_EN (1 << 11)
/* Page 3 registers */
#define LED_FUNC_CTRL_REG 0x10
#define LED_FUNC_CTRL_MASK 0x0FFF
#define LED_TIMER_CTRL_REG 0x12