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- drivers
- net
- ethernet
- ti
- netcp_xgbepcsr.c
/*
* XGE PCSR module initialisation
*
* Copyright (C) 2014 Texas Instruments Incorporated
* Authors: Sandeep Nair <sandeep_n@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"
/* XGBE registers */
#define XGBE_CTRL_OFFSET 0x0c
#define XGBE_SGMII_1_OFFSET 0x0114
#define XGBE_SGMII_2_OFFSET 0x0214
/* PCS-R registers */
#define PCSR_CPU_CTRL_OFFSET 0x1fd0
#define POR_EN BIT(29)
#define reg_rmw(addr, value, mask) \
writel(((readl(addr) & (~(mask))) | \
(value & (mask))), (addr))
/* bit mask of width w at offset s */
#define MASK_WID_SH(w, s) (((1 << w) - 1) << s)
/* shift value v to offset s */
#define VAL_SH(v, s) (v << s)
#define PHY_A(serdes) 0
struct serdes_cfg {
u32 ofs;
u32 val;
u32 mask;
};
static struct serdes_cfg cfg_phyb_1p25g_156p25mhz_cmu0[] = {
{0x0000, 0x00800002, 0x00ff00ff},
{0x0014, 0x00003838, 0x0000ffff},
{0x0060, 0x1c44e438, 0xffffffff},
{0x0064, 0x00c18400, 0x00ffffff},
{0x0068, 0x17078200, 0xffffff00},
{0x006c, 0x00000014, 0x000000ff},
{0x0078, 0x0000c000, 0x0000ff00},
{0x0000, 0x00000003, 0x000000ff},
};
static struct serdes_cfg cfg_phyb_10p3125g_156p25mhz_cmu1[] = {
{0x0c00, 0x00030002, 0x00ff00ff},
{0x0c14, 0x00005252, 0x0000ffff},
{0x0c28, 0x80000000, 0xff000000},
{0x0c2c, 0x000000f6, 0x000000ff},
{0x0c3c, 0x04000405, 0xff00ffff},
{0x0c40, 0xc0800000, 0xffff0000},
{0x0c44, 0x5a202062, 0xffffffff},
{0x0c48, 0x40040424, 0xffffffff},
{0x0c4c, 0x00004002, 0x0000ffff},
{0x0c50, 0x19001c00, 0xff00ff00},
{0x0c54, 0x00002100, 0x0000ff00},
{0x0c58, 0x00000060, 0x000000ff},
{0x0c60, 0x80131e7c, 0xffffffff},
{0x0c64, 0x8400cb02, 0xff00ffff},
{0x0c68, 0x17078200, 0xffffff00},
{0x0c6c, 0x00000016, 0x000000ff},
{0x0c74, 0x00000400, 0x0000ff00},
{0x0c78, 0x0000c000, 0x0000ff00},
{0x0c00, 0x00000003, 0x000000ff},
};
static struct serdes_cfg cfg_phyb_10p3125g_16bit_lane[] = {
{0x0204, 0x00000080, 0x000000ff},
{0x0208, 0x0000920d, 0x0000ffff},
{0x0204, 0xfc000000, 0xff000000},
{0x0208, 0x00009104, 0x0000ffff},
{0x0210, 0x1a000000, 0xff000000},
{0x0214, 0x00006b58, 0x00ffffff},
{0x0218, 0x75800084, 0xffff00ff},
{0x022c, 0x00300000, 0x00ff0000},
{0x0230, 0x00003800, 0x0000ff00},
{0x024c, 0x008f0000, 0x00ff0000},
{0x0250, 0x30000000, 0xff000000},
{0x0260, 0x00000002, 0x000000ff},
{0x0264, 0x00000057, 0x000000ff},
{0x0268, 0x00575700, 0x00ffff00},
{0x0278, 0xff000000, 0xff000000},
{0x0280, 0x00500050, 0x00ff00ff},
{0x0284, 0x00001f15, 0x0000ffff},
{0x028c, 0x00006f00, 0x0000ff00},
{0x0294, 0x00000000, 0xffffff00},
{0x0298, 0x00002640, 0xff00ffff},
{0x029c, 0x00000003, 0x000000ff},
{0x02a4, 0x00000f13, 0x0000ffff},
{0x02a8, 0x0001b600, 0x00ffff00},
{0x0380, 0x00000030, 0x000000ff},
{0x03c0, 0x00000200, 0x0000ff00},
{0x03cc, 0x00000018, 0x000000ff},
{0x03cc, 0x00000000, 0x000000ff},
};
static struct serdes_cfg cfg_phyb_10p3125g_comlane[] = {
{0x0a00, 0x00000800, 0x0000ff00},
{0x0a84, 0x00000000, 0x000000ff},
{0x0a8c, 0x00130000, 0x00ff0000},
{0x0a90, 0x77a00000, 0xffff0000},
{0x0a94, 0x00007777, 0x0000ffff},
{0x0b08, 0x000f0000, 0xffff0000},
{0x0b0c, 0x000f0000, 0x00ffffff},
{0x0b10, 0xbe000000, 0xff000000},
{0x0b14, 0x000000ff, 0x000000ff},
{0x0b18, 0x00000014, 0x000000ff},
{0x0b5c, 0x981b0000, 0xffff0000},
{0x0b64, 0x00001100, 0x0000ff00},
{0x0b78, 0x00000c00, 0x0000ff00},
{0x0abc, 0xff000000, 0xff000000},
{0x0ac0, 0x0000008b, 0x000000ff},
};
static struct serdes_cfg cfg_cm_c1_c2[] = {
{0x0208, 0x00000000, 0x00000f00},
{0x0208, 0x00000000, 0x0000001f},
{0x0204, 0x00000000, 0x00040000},
{0x0208, 0x000000a0, 0x000000e0},
};
static void netcp_xgbe_serdes_cmu_init(void __iomem *serdes_regs)
{
int i;
/* cmu0 setup */
for (i = 0; i < ARRAY_SIZE(cfg_phyb_1p25g_156p25mhz_cmu0); i++) {
reg_rmw(serdes_regs + cfg_phyb_1p25g_156p25mhz_cmu0[i].ofs,
cfg_phyb_1p25g_156p25mhz_cmu0[i].val,
cfg_phyb_1p25g_156p25mhz_cmu0[i].mask);
}
/* cmu1 setup */
for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_156p25mhz_cmu1); i++) {
reg_rmw(serdes_regs + cfg_phyb_10p3125g_156p25mhz_cmu1[i].ofs,
cfg_phyb_10p3125g_156p25mhz_cmu1[i].val,
cfg_phyb_10p3125g_156p25mhz_cmu1[i].mask);
}
}
/* lane is 0 based */
static void netcp_xgbe_serdes_lane_config(
void __iomem *serdes_regs, int lane)
{
int i;
/* lane setup */
for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_16bit_lane); i++) {
reg_rmw(serdes_regs +
cfg_phyb_10p3125g_16bit_lane[i].ofs +
(0x200 * lane),
cfg_phyb_10p3125g_16bit_lane[i].val,
cfg_phyb_10p3125g_16bit_lane[i].mask);
}
/* disable auto negotiation*/
reg_rmw(serdes_regs + (0x200 * lane) + 0x0380,
0x00000000, 0x00000010);
/* disable link training */
reg_rmw(serdes_regs + (0x200 * lane) + 0x03c0,
0x00000000, 0x00000200);
}
static void netcp_xgbe_serdes_com_enable(void __iomem *serdes_regs)
{
int i;
for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_comlane); i++) {
reg_rmw(serdes_regs + cfg_phyb_10p3125g_comlane[i].ofs,
cfg_phyb_10p3125g_comlane[i].val,
cfg_phyb_10p3125g_comlane[i].mask);
}
}
static void netcp_xgbe_serdes_lane_enable(
void __iomem *serdes_regs, int lane)
{
/* Set Lane Control Rate */
writel(0xe0e9e038, serdes_regs + 0x1fe0 + (4 * lane));
}
static void netcp_xgbe_serdes_phyb_rst_clr(void __iomem *serdes_regs)
{
reg_rmw(serdes_regs + 0x0a00, 0x0000001f, 0x000000ff);
}
static void netcp_xgbe_serdes_pll_disable(void __iomem *serdes_regs)
{
writel(0x88000000, serdes_regs + 0x1ff4);
}
static void netcp_xgbe_serdes_pll_enable(void __iomem *serdes_regs)
{
netcp_xgbe_serdes_phyb_rst_clr(serdes_regs);
writel(0xee000000, serdes_regs + 0x1ff4);
}
static int netcp_xgbe_wait_pll_locked(void __iomem *sw_regs)
{
unsigned long timeout;
int ret = 0;
u32 val_1, val_0;
timeout = jiffies + msecs_to_jiffies(500);
do {
val_0 = (readl(sw_regs + XGBE_SGMII_1_OFFSET) & BIT(4));
val_1 = (readl(sw_regs + XGBE_SGMII_2_OFFSET) & BIT(4));
if (val_1 && val_0)
return 0;
if (time_after(jiffies, timeout)) {
ret = -ETIMEDOUT;
break;
}
cpu_relax();
} while (true);
pr_err("XGBE serdes not locked: time out.\n");
return ret;
}
static void netcp_xgbe_serdes_enable_xgmii_port(void __iomem *sw_regs)
{
writel(0x03, sw_regs + XGBE_CTRL_OFFSET);
}
static u32 netcp_xgbe_serdes_read_tbus_val(void __iomem *serdes_regs)
{
u32 tmp;
if (PHY_A(serdes_regs)) {
tmp = (readl(serdes_regs + 0x0ec) >> 24) & 0x0ff;
tmp |= ((readl(serdes_regs + 0x0fc) >> 16) & 0x00f00);
} else {
tmp = (readl(serdes_regs + 0x0f8) >> 16) & 0x0fff;
}
return tmp;
}
static void netcp_xgbe_serdes_write_tbus_addr(void __iomem *serdes_regs,
int select, int ofs)
{
if (PHY_A(serdes_regs)) {
reg_rmw(serdes_regs + 0x0008, ((select << 5) + ofs) << 24,
~0x00ffffff);
return;
}
/* For 2 lane Phy-B, lane0 is actually lane1 */
switch (select) {
case 1:
select = 2;
break;
case 2:
select = 3;
break;
default:
return;
}
reg_rmw(serdes_regs + 0x00fc, ((select << 8) + ofs) << 16, ~0xf800ffff);
}
static u32 netcp_xgbe_serdes_read_select_tbus(void __iomem *serdes_regs,
int select, int ofs)
{
/* Set tbus address */
netcp_xgbe_serdes_write_tbus_addr(serdes_regs, select, ofs);
/* Get TBUS Value */
return netcp_xgbe_serdes_read_tbus_val(serdes_regs);
}
static void netcp_xgbe_serdes_reset_cdr(void __iomem *serdes_regs,
void __iomem *sig_detect_reg, int lane)
{
u32 tmp, dlpf, tbus;
/*Get the DLPF values */
tmp = netcp_xgbe_serdes_read_select_tbus(
serdes_regs, lane + 1, 5);
dlpf = tmp >> 2;
if (dlpf < 400 || dlpf > 700) {
reg_rmw(sig_detect_reg, VAL_SH(2, 1), MASK_WID_SH(2, 1));
mdelay(1);
reg_rmw(sig_detect_reg, VAL_SH(0, 1), MASK_WID_SH(2, 1));
} else {
tbus = netcp_xgbe_serdes_read_select_tbus(serdes_regs, lane +
1, 0xe);
pr_debug("XGBE: CDR centered, DLPF: %4d,%d,%d.\n",
tmp >> 2, tmp & 3, (tbus >> 2) & 3);
}
}
/* Call every 100 ms */
static int netcp_xgbe_check_link_status(void __iomem *serdes_regs,
void __iomem *sw_regs, u32 lanes,
u32 *current_state, u32 *lane_down)
{
void __iomem *pcsr_base = sw_regs + 0x0600;
void __iomem *sig_detect_reg;
u32 pcsr_rx_stat, blk_lock, blk_errs;
int loss, i, status = 1;
for (i = 0; i < lanes; i++) {
/* Get the Loss bit */
loss = readl(serdes_regs + 0x1fc0 + 0x20 + (i * 0x04)) & 0x1;
/* Get Block Errors and Block Lock bits */
pcsr_rx_stat = readl(pcsr_base + 0x0c + (i * 0x80));
blk_lock = (pcsr_rx_stat >> 30) & 0x1;
blk_errs = (pcsr_rx_stat >> 16) & 0x0ff;
/* Get Signal Detect Overlay Address */
sig_detect_reg = serdes_regs + (i * 0x200) + 0x200 + 0x04;
/* If Block errors maxed out, attempt recovery! */
if (blk_errs == 0x0ff)
blk_lock = 0;
switch (current_state[i]) {
case 0:
/* if good link lock the signal detect ON! */
if (!loss && blk_lock) {
pr_debug("XGBE PCSR Linked Lane: %d\n", i);
reg_rmw(sig_detect_reg, VAL_SH(3, 1),
MASK_WID_SH(2, 1));
current_state[i] = 1;
} else if (!blk_lock) {
/* if no lock, then reset CDR */
pr_debug("XGBE PCSR Recover Lane: %d\n", i);
netcp_xgbe_serdes_reset_cdr(serdes_regs,
sig_detect_reg, i);
}
break;
case 1:
if (!blk_lock) {
/* Link Lost? */
lane_down[i] = 1;
current_state[i] = 2;
}
break;
case 2:
if (blk_lock)
/* Nope just noise */
current_state[i] = 1;
else {
/* Lost the block lock, reset CDR if it is
* not centered and go back to sync state
*/
netcp_xgbe_serdes_reset_cdr(serdes_regs,
sig_detect_reg, i);
current_state[i] = 0;
}
break;
default:
pr_err("XGBE: unknown current_state[%d] %d\n",
i, current_state[i]);
break;
}
if (blk_errs > 0) {
/* Reset the Error counts! */
reg_rmw(pcsr_base + 0x08 + (i * 0x80), VAL_SH(0x19, 0),
MASK_WID_SH(8, 0));
reg_rmw(pcsr_base + 0x08 + (i * 0x80), VAL_SH(0x00, 0),
MASK_WID_SH(8, 0));
}
status &= (current_state[i] == 1);
}
return status;
}
static int netcp_xgbe_serdes_check_lane(void __iomem *serdes_regs,
void __iomem *sw_regs)
{
u32 current_state[2] = {0, 0};
int retries = 0, link_up;
u32 lane_down[2];
do {
lane_down[0] = 0;
lane_down[1] = 0;
link_up = netcp_xgbe_check_link_status(serdes_regs, sw_regs, 2,
current_state,
lane_down);
/* if we did not get link up then wait 100ms before calling
* it again
*/
if (link_up)
break;
if (lane_down[0])
pr_debug("XGBE: detected link down on lane 0\n");
if (lane_down[1])
pr_debug("XGBE: detected link down on lane 1\n");
if (++retries > 1) {
pr_debug("XGBE: timeout waiting for serdes link up\n");
return -ETIMEDOUT;
}
mdelay(100);
} while (!link_up);
pr_debug("XGBE: PCSR link is up\n");
return 0;
}
static void netcp_xgbe_serdes_setup_cm_c1_c2(void __iomem *serdes_regs,
int lane, int cm, int c1, int c2)
{
int i;
for (i = 0; i < ARRAY_SIZE(cfg_cm_c1_c2); i++) {
reg_rmw(serdes_regs + cfg_cm_c1_c2[i].ofs + (0x200 * lane),
cfg_cm_c1_c2[i].val,
cfg_cm_c1_c2[i].mask);
}
}
static void netcp_xgbe_reset_serdes(void __iomem *serdes_regs)
{
/* Toggle the POR_EN bit in CONFIG.CPU_CTRL */
/* enable POR_EN bit */
reg_rmw(serdes_regs + PCSR_CPU_CTRL_OFFSET, POR_EN, POR_EN);
usleep_range(10, 100);
/* disable POR_EN bit */
reg_rmw(serdes_regs + PCSR_CPU_CTRL_OFFSET, 0, POR_EN);
usleep_range(10, 100);
}
static int netcp_xgbe_serdes_config(void __iomem *serdes_regs,
void __iomem *sw_regs)
{
u32 ret, i;
netcp_xgbe_serdes_pll_disable(serdes_regs);
netcp_xgbe_serdes_cmu_init(serdes_regs);
for (i = 0; i < 2; i++)
netcp_xgbe_serdes_lane_config(serdes_regs, i);
netcp_xgbe_serdes_com_enable(serdes_regs);
/* This is EVM + RTM-BOC specific */
for (i = 0; i < 2; i++)
netcp_xgbe_serdes_setup_cm_c1_c2(serdes_regs, i, 0, 0, 5);
netcp_xgbe_serdes_pll_enable(serdes_regs);
for (i = 0; i < 2; i++)
netcp_xgbe_serdes_lane_enable(serdes_regs, i);
/* SB PLL Status Poll */
ret = netcp_xgbe_wait_pll_locked(sw_regs);
if (ret)
return ret;
netcp_xgbe_serdes_enable_xgmii_port(sw_regs);
netcp_xgbe_serdes_check_lane(serdes_regs, sw_regs);
return ret;
}
int netcp_xgbe_serdes_init(void __iomem *serdes_regs, void __iomem *xgbe_regs)
{
u32 val;
/* read COMLANE bits 4:0 */
val = readl(serdes_regs + 0xa00);
if (val & 0x1f) {
pr_debug("XGBE: serdes already in operation - reset\n");
netcp_xgbe_reset_serdes(serdes_regs);
}
return netcp_xgbe_serdes_config(serdes_regs, xgbe_regs);
}