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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012
* Valentin Lontgchamp, Keymile AG, valentin.longchamp@keymile.com
*/
#include <common.h>
#include <command.h>
#include <log.h>
#include <miiphy.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <mv88e6352.h>
#define SMI_HDR ((0x8 | 0x1) << 12)
#define SMI_BUSY_MASK (0x8000)
#define SMIRD_OP (0x2 << 10)
#define SMIWR_OP (0x1 << 10)
#define SMI_MASK 0x1f
#define PORT_SHIFT 5
#define COMMAND_REG 0
#define DATA_REG 1
/* global registers */
#define GLOBAL 0x1b
#define GLOBAL_STATUS 0x00
#define PPU_STATE 0x8000
#define GLOBAL_CTRL 0x04
#define SW_RESET 0x8000
#define PPU_ENABLE 0x4000
static int sw_wait_rdy(const char *devname, u8 phy_addr)
{
u16 command;
u32 timeout = 100;
int ret;
/* wait till the SMI is not busy */
do {
/* read command register */
ret = miiphy_read(devname, phy_addr, COMMAND_REG, &command);
if (ret < 0) {
printf("%s: Error reading command register\n",
__func__);
return ret;
}
if (timeout-- == 0) {
printf("Err..(%s) SMI busy timeout\n", __func__);
return -EFAULT;
}
} while (command & SMI_BUSY_MASK);
return 0;
}
static int sw_reg_read(const char *devname, u8 phy_addr, u8 port,
u8 reg, u16 *data)
{
int ret;
u16 command;
ret = sw_wait_rdy(devname, phy_addr);
if (ret)
return ret;
command = SMI_HDR | SMIRD_OP | ((port&SMI_MASK) << PORT_SHIFT) |
(reg & SMI_MASK);
debug("%s: write to command: %#x\n", __func__, command);
ret = miiphy_write(devname, phy_addr, COMMAND_REG, command);
if (ret)
return ret;
ret = sw_wait_rdy(devname, phy_addr);
if (ret)
return ret;
ret = miiphy_read(devname, phy_addr, DATA_REG, data);
return ret;
}
static int sw_reg_write(const char *devname, u8 phy_addr, u8 port,
u8 reg, u16 data)
{
int ret;
u16 value;
ret = sw_wait_rdy(devname, phy_addr);
if (ret)
return ret;
debug("%s: write to data: %#x\n", __func__, data);
ret = miiphy_write(devname, phy_addr, DATA_REG, data);
if (ret)
return ret;
value = SMI_HDR | SMIWR_OP | ((port & SMI_MASK) << PORT_SHIFT) |
(reg & SMI_MASK);
debug("%s: write to command: %#x\n", __func__, value);
ret = miiphy_write(devname, phy_addr, COMMAND_REG, value);
if (ret)
return ret;
ret = sw_wait_rdy(devname, phy_addr);
if (ret)
return ret;
return 0;
}
static int ppu_enable(const char *devname, u8 phy_addr)
{
int i, ret = 0;
u16 reg;
ret = sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_CTRL, ®);
if (ret) {
printf("%s: Error reading global ctrl reg\n", __func__);
return ret;
}
reg |= PPU_ENABLE;
ret = sw_reg_write(devname, phy_addr, GLOBAL, GLOBAL_CTRL, reg);
if (ret) {
printf("%s: Error writing global ctrl reg\n", __func__);
return ret;
}
for (i = 0; i < 1000; i++) {
sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_STATUS,
®);
if ((reg & 0xc000) == 0xc000)
return 0;
udelay(1000);
}
return -ETIMEDOUT;
}
static int ppu_disable(const char *devname, u8 phy_addr)
{
int i, ret = 0;
u16 reg;
ret = sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_CTRL, ®);
if (ret) {
printf("%s: Error reading global ctrl reg\n", __func__);
return ret;
}
reg &= ~PPU_ENABLE;
ret = sw_reg_write(devname, phy_addr, GLOBAL, GLOBAL_CTRL, reg);
if (ret) {
printf("%s: Error writing global ctrl reg\n", __func__);
return ret;
}
for (i = 0; i < 1000; i++) {
sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_STATUS,
®);
if ((reg & 0xc000) != 0xc000)
return 0;
udelay(1000);
}
return -ETIMEDOUT;
}
int mv88e_sw_program(const char *devname, u8 phy_addr,
struct mv88e_sw_reg *regs, int regs_nb)
{
int i, ret = 0;
/* first we need to disable the PPU */
ret = ppu_disable(devname, phy_addr);
if (ret) {
printf("%s: Error disabling PPU\n", __func__);
return ret;
}
for (i = 0; i < regs_nb; i++) {
ret = sw_reg_write(devname, phy_addr, regs[i].port,
regs[i].reg, regs[i].value);
if (ret) {
printf("%s: Error configuring switch\n", __func__);
ppu_enable(devname, phy_addr);
return ret;
}
}
/* re-enable the PPU */
ret = ppu_enable(devname, phy_addr);
if (ret) {
printf("%s: Error enabling PPU\n", __func__);
return ret;
}
return 0;
}
int mv88e_sw_reset(const char *devname, u8 phy_addr)
{
int i, ret = 0;
u16 reg;
ret = sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_CTRL, ®);
if (ret) {
printf("%s: Error reading global ctrl reg\n", __func__);
return ret;
}
reg = SW_RESET | PPU_ENABLE | 0x0400;
ret = sw_reg_write(devname, phy_addr, GLOBAL, GLOBAL_CTRL, reg);
if (ret) {
printf("%s: Error writing global ctrl reg\n", __func__);
return ret;
}
for (i = 0; i < 1000; i++) {
sw_reg_read(devname, phy_addr, GLOBAL, GLOBAL_STATUS,
®);
if ((reg & 0xc800) != 0xc800)
return 0;
udelay(1000);
}
return -ETIMEDOUT;
}
int do_mvsw_reg_read(const char *name, int argc, char *const argv[])
{
u16 value = 0, phyaddr, reg, port;
int ret;
phyaddr = dectoul(argv[1], NULL);
port = dectoul(argv[2], NULL);
reg = dectoul(argv[3], NULL);
ret = sw_reg_read(name, phyaddr, port, reg, &value);
printf("%#x\n", value);
return ret;
}
int do_mvsw_reg_write(const char *name, int argc, char *const argv[])
{
u16 value = 0, phyaddr, reg, port;
int ret;
phyaddr = dectoul(argv[1], NULL);
port = dectoul(argv[2], NULL);
reg = dectoul(argv[3], NULL);
value = hextoul(argv[4], NULL);
ret = sw_reg_write(name, phyaddr, port, reg, value);
return ret;
}
int do_mvsw_reg(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
int ret;
const char *cmd, *ethname;
if (argc < 2)
return cmd_usage(cmdtp);
cmd = argv[1];
--argc;
++argv;
if (strcmp(cmd, "read") == 0) {
if (argc < 5)
return cmd_usage(cmdtp);
ethname = argv[1];
--argc;
++argv;
ret = do_mvsw_reg_read(ethname, argc, argv);
} else if (strcmp(cmd, "write") == 0) {
if (argc < 6)
return cmd_usage(cmdtp);
ethname = argv[1];
--argc;
++argv;
ret = do_mvsw_reg_write(ethname, argc, argv);
} else
return cmd_usage(cmdtp);
return ret;
}
U_BOOT_CMD(
mvsw_reg, 7, 1, do_mvsw_reg,
"marvell 88e6352 switch register access",
"write ethname phyaddr port reg value\n"
"mvsw_reg read ethname phyaddr port reg\n"
);
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