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/*
* SGMI module initialisation
*
* Copyright (C) 2014 Texas Instruments Incorporated
* Authors: Sandeep Nair <sandeep_n@ti.com>
* Sandeep Paulraj <s-paulraj@ti.com>
* Wingman Kwok <w-kwok2@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "netcp.h"
#define SGMII_SRESET_RESET BIT(0)
#define SGMII_SRESET_RTRESET BIT(1)
#define SGMII_REG_STATUS_LOCK BIT(4)
#define SGMII_REG_STATUS_LINK BIT(0)
#define SGMII_REG_STATUS_AUTONEG BIT(2)
#define SGMII_REG_CONTROL_AUTONEG BIT(0)
#define SGMII23_OFFSET(x) ((x - 2) * 0x100)
#define SGMII_OFFSET(x) ((x <= 1) ? (x * 0x100) : (SGMII23_OFFSET(x)))
/* SGMII registers */
#define SGMII_SRESET_REG(x) (SGMII_OFFSET(x) + 0x004)
#define SGMII_CTL_REG(x) (SGMII_OFFSET(x) + 0x010)
#define SGMII_STATUS_REG(x) (SGMII_OFFSET(x) + 0x014)
#define SGMII_MRADV_REG(x) (SGMII_OFFSET(x) + 0x018)
static void sgmii_write_reg(void __iomem *base, int reg, u32 val)
{
writel(val, base + reg);
}
static u32 sgmii_read_reg(void __iomem *base, int reg)
{
return readl(base + reg);
}
static void sgmii_write_reg_bit(void __iomem *base, int reg, u32 val)
{
writel((readl(base + reg) | val), base + reg);
}
/* port is 0 based */
int netcp_sgmii_reset(void __iomem *sgmii_ofs, int port)
{
/* Soft reset */
sgmii_write_reg_bit(sgmii_ofs, SGMII_SRESET_REG(port),
SGMII_SRESET_RESET);
while ((sgmii_read_reg(sgmii_ofs, SGMII_SRESET_REG(port)) &
SGMII_SRESET_RESET) != 0x0)
;
return 0;
}
/* port is 0 based */
bool netcp_sgmii_rtreset(void __iomem *sgmii_ofs, int port, bool set)
{
u32 reg;
bool oldval;
/* Initiate a soft reset */
reg = sgmii_read_reg(sgmii_ofs, SGMII_SRESET_REG(port));
oldval = (reg & SGMII_SRESET_RTRESET) != 0x0;
if (set)
reg |= SGMII_SRESET_RTRESET;
else
reg &= ~SGMII_SRESET_RTRESET;
sgmii_write_reg(sgmii_ofs, SGMII_SRESET_REG(port), reg);
wmb();
return oldval;
}
int netcp_sgmii_get_port_link(void __iomem *sgmii_ofs, int port)
{
u32 status = 0, link = 0;
status = sgmii_read_reg(sgmii_ofs, SGMII_STATUS_REG(port));
if ((status & SGMII_REG_STATUS_LINK) != 0)
link = 1;
return link;
}
int netcp_sgmii_config(void __iomem *sgmii_ofs, int port, u32 interface)
{
unsigned int i, status, mask;
u32 mr_adv_ability;
u32 control;
switch (interface) {
case SGMII_LINK_MAC_MAC_AUTONEG:
mr_adv_ability = 0x9801;
control = 0x21;
break;
case SGMII_LINK_MAC_PHY:
case SGMII_LINK_MAC_PHY_NO_MDIO:
mr_adv_ability = 1;
control = 1;
break;
case SGMII_LINK_MAC_MAC_FORCED:
mr_adv_ability = 0x9801;
control = 0x20;
break;
case SGMII_LINK_MAC_FIBER:
mr_adv_ability = 0x20;
control = 0x1;
break;
default:
WARN_ONCE(1, "Invalid sgmii interface: %d\n", interface);
return -EINVAL;
}
sgmii_write_reg(sgmii_ofs, SGMII_CTL_REG(port), 0);
/* Wait for the SerDes pll to lock */
for (i = 0; i < 1000; i++) {
usleep_range(1000, 2000);
status = sgmii_read_reg(sgmii_ofs, SGMII_STATUS_REG(port));
if ((status & SGMII_REG_STATUS_LOCK) != 0)
break;
}
if ((status & SGMII_REG_STATUS_LOCK) == 0)
pr_err("serdes PLL not locked\n");
sgmii_write_reg(sgmii_ofs, SGMII_MRADV_REG(port), mr_adv_ability);
sgmii_write_reg(sgmii_ofs, SGMII_CTL_REG(port), control);
mask = SGMII_REG_STATUS_LINK;
if (control & SGMII_REG_CONTROL_AUTONEG)
mask |= SGMII_REG_STATUS_AUTONEG;
for (i = 0; i < 1000; i++) {
usleep_range(200, 500);
status = sgmii_read_reg(sgmii_ofs, SGMII_STATUS_REG(port));
if ((status & mask) == mask)
break;
}
return 0;
}
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