u-boot/arch/arm/mach-mvebu/serdes/a38x/ctrl_pex.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) Marvell International Ltd. and its affiliates
*/
#include <common.h>
#include <spl.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include "ctrl_pex.h"
#include "sys_env_lib.h"
__weak void board_pex_config(void)
{
/* nothing in this weak default implementation */
}
int hws_pex_config(const struct serdes_map *serdes_map, u8 count)
{
u32 pex_idx, tmp, next_busno, first_busno, temp_pex_reg,
temp_reg, addr, dev_id, ctrl_mode;
enum serdes_type serdes_type;
u32 idx;
DEBUG_INIT_FULL_S("\n### hws_pex_config ###\n");
for (idx = 0; idx < count; idx++) {
serdes_type = serdes_map[idx].serdes_type;
/* configuration for PEX only */
if ((serdes_type != PEX0) && (serdes_type != PEX1) &&
(serdes_type != PEX2) && (serdes_type != PEX3))
continue;
if ((serdes_type != PEX0) &&
((serdes_map[idx].serdes_mode == PEX_ROOT_COMPLEX_X4) ||
(serdes_map[idx].serdes_mode == PEX_END_POINT_X4))) {
/* for PEX by4 - relevant for the first port only */
continue;
}
pex_idx = serdes_type - PEX0;
tmp = reg_read(PEX_CAPABILITIES_REG(pex_idx));
tmp &= ~(0xf << 20);
tmp |= (0x4 << 20);
reg_write(PEX_CAPABILITIES_REG(pex_idx), tmp);
}
tmp = reg_read(SOC_CTRL_REG);
tmp &= ~0x03;
for (idx = 0; idx < count; idx++) {
serdes_type = serdes_map[idx].serdes_type;
if ((serdes_type != PEX0) &&
((serdes_map[idx].serdes_mode == PEX_ROOT_COMPLEX_X4) ||
(serdes_map[idx].serdes_mode == PEX_END_POINT_X4))) {
/* for PEX by4 - relevant for the first port only */
continue;
}
switch (serdes_type) {
case PEX0:
tmp |= 0x1 << PCIE0_ENABLE_OFFS;
break;
case PEX1:
tmp |= 0x1 << PCIE1_ENABLE_OFFS;
break;
case PEX2:
tmp |= 0x1 << PCIE2_ENABLE_OFFS;
break;
case PEX3:
tmp |= 0x1 << PCIE3_ENABLE_OFFS;
break;
default:
break;
}
}
reg_write(SOC_CTRL_REG, tmp);
/* Support gen1/gen2 */
DEBUG_INIT_FULL_S("Support gen1/gen2\n");
board_pex_config();
next_busno = 0;
mdelay(150);
for (idx = 0; idx < count; idx++) {
serdes_type = serdes_map[idx].serdes_type;
DEBUG_INIT_FULL_S(" serdes_type=0x");
DEBUG_INIT_FULL_D(serdes_type, 8);
DEBUG_INIT_FULL_S("\n");
DEBUG_INIT_FULL_S(" idx=0x");
DEBUG_INIT_FULL_D(idx, 8);
DEBUG_INIT_FULL_S("\n");
/* Configuration for PEX only */
if ((serdes_type != PEX0) && (serdes_type != PEX1) &&
(serdes_type != PEX2) && (serdes_type != PEX3))
continue;
if ((serdes_type != PEX0) &&
((serdes_map[idx].serdes_mode == PEX_ROOT_COMPLEX_X4) ||
(serdes_map[idx].serdes_mode == PEX_END_POINT_X4))) {
/* for PEX by4 - relevant for the first port only */
continue;
}
pex_idx = serdes_type - PEX0;
tmp = reg_read(PEX_DBG_STATUS_REG(pex_idx));
first_busno = next_busno;
if ((tmp & 0x7f) != 0x7e) {
DEBUG_INIT_S("PCIe, Idx ");
DEBUG_INIT_D(pex_idx, 1);
DEBUG_INIT_S(": detected no link\n");
continue;
}
next_busno++;
temp_pex_reg = reg_read((PEX_CFG_DIRECT_ACCESS
(pex_idx, PEX_LINK_CAPABILITY_REG)));
temp_pex_reg &= 0xf;
if (temp_pex_reg != 0x2)
continue;
temp_reg = (reg_read(PEX_CFG_DIRECT_ACCESS(
pex_idx,
PEX_LINK_CTRL_STAT_REG)) &
0xf0000) >> 16;
/* Check if the link established is GEN1 */
DEBUG_INIT_FULL_S
("Checking if the link established is gen1\n");
if (temp_reg != 0x1)
continue;
pex_local_bus_num_set(pex_idx, first_busno);
pex_local_dev_num_set(pex_idx, 1);
DEBUG_INIT_FULL_S("PCIe, Idx ");
DEBUG_INIT_FULL_D(pex_idx, 1);
DEBUG_INIT_S(":** Link is Gen1, check the EP capability\n");
/* link is Gen1, check the EP capability */
addr = pex_config_read(pex_idx, first_busno, 0, 0, 0x34) & 0xff;
DEBUG_INIT_FULL_C("pex_config_read: return addr=0x%x", addr, 4);
if (addr == 0xff) {
DEBUG_INIT_FULL_C
("pex_config_read: return 0xff -->PCIe (%d): Detected No Link.",
pex_idx, 1);
continue;
}
while ((pex_config_read(pex_idx, first_busno, 0, 0, addr)
& 0xff) != 0x10) {
addr = (pex_config_read(pex_idx, first_busno, 0,
0, addr) & 0xff00) >> 8;
}
/* Check for Gen2 and above */
if ((pex_config_read(pex_idx, first_busno, 0, 0,
addr + 0xc) & 0xf) < 0x2) {
DEBUG_INIT_S("PCIe, Idx ");
DEBUG_INIT_D(pex_idx, 1);
DEBUG_INIT_S(": remains Gen1\n");
continue;
}
tmp = reg_read(PEX_LINK_CTRL_STATUS2_REG(pex_idx));
DEBUG_RD_REG(PEX_LINK_CTRL_STATUS2_REG(pex_idx), tmp);
tmp &= ~(BIT(0) | BIT(1));
tmp |= BIT(1);
tmp |= BIT(6); /* Select Deemphasize (-3.5d_b) */
reg_write(PEX_LINK_CTRL_STATUS2_REG(pex_idx), tmp);
DEBUG_WR_REG(PEX_LINK_CTRL_STATUS2_REG(pex_idx), tmp);
tmp = reg_read(PEX_CTRL_REG(pex_idx));
DEBUG_RD_REG(PEX_CTRL_REG(pex_idx), tmp);
tmp |= BIT(10);
reg_write(PEX_CTRL_REG(pex_idx), tmp);
DEBUG_WR_REG(PEX_CTRL_REG(pex_idx), tmp);
/*
* We need to wait 10ms before reading the PEX_DBG_STATUS_REG
* in order not to read the status of the former state
*/
mdelay(10);
DEBUG_INIT_S("PCIe, Idx ");
DEBUG_INIT_D(pex_idx, 1);
DEBUG_INIT_S
(": Link upgraded to Gen2 based on client capabilities\n");
}
/* Update pex DEVICE ID */
ctrl_mode = sys_env_model_get();
for (idx = 0; idx < count; idx++) {
serdes_type = serdes_map[idx].serdes_type;
/* configuration for PEX only */
if ((serdes_type != PEX0) && (serdes_type != PEX1) &&
(serdes_type != PEX2) && (serdes_type != PEX3))
continue;
if ((serdes_type != PEX0) &&
((serdes_map[idx].serdes_mode == PEX_ROOT_COMPLEX_X4) ||
(serdes_map[idx].serdes_mode == PEX_END_POINT_X4))) {
/* for PEX by4 - relevant for the first port only */
continue;
}
pex_idx = serdes_type - PEX0;
dev_id = reg_read(PEX_CFG_DIRECT_ACCESS
(pex_idx, PEX_DEVICE_AND_VENDOR_ID));
dev_id &= 0xffff;
dev_id |= ((ctrl_mode << 16) & 0xffff0000);
reg_write(PEX_CFG_DIRECT_ACCESS
(pex_idx, PEX_DEVICE_AND_VENDOR_ID), dev_id);
}
DEBUG_INIT_FULL_C("Update PEX Device ID ", ctrl_mode, 4);
return MV_OK;
}
int pex_local_bus_num_set(u32 pex_if, u32 bus_num)
{
u32 pex_status;
DEBUG_INIT_FULL_S("\n### pex_local_bus_num_set ###\n");
if (bus_num >= MAX_PEX_BUSSES) {
DEBUG_INIT_C("pex_local_bus_num_set: Illegal bus number %d\n",
bus_num, 4);
return MV_BAD_PARAM;
}
pex_status = reg_read(PEX_STATUS_REG(pex_if));
pex_status &= ~PXSR_PEX_BUS_NUM_MASK;
pex_status |=
(bus_num << PXSR_PEX_BUS_NUM_OFFS) & PXSR_PEX_BUS_NUM_MASK;
reg_write(PEX_STATUS_REG(pex_if), pex_status);
return MV_OK;
}
int pex_local_dev_num_set(u32 pex_if, u32 dev_num)
{
u32 pex_status;
DEBUG_INIT_FULL_S("\n### pex_local_dev_num_set ###\n");
pex_status = reg_read(PEX_STATUS_REG(pex_if));
pex_status &= ~PXSR_PEX_DEV_NUM_MASK;
pex_status |=
(dev_num << PXSR_PEX_DEV_NUM_OFFS) & PXSR_PEX_DEV_NUM_MASK;
reg_write(PEX_STATUS_REG(pex_if), pex_status);
return MV_OK;
}
/*
* pex_config_read - Read from configuration space
*
* DESCRIPTION:
* This function performs a 32 bit read from PEX configuration space.
* It supports both type 0 and type 1 of Configuration Transactions
* (local and over bridge). In order to read from local bus segment, use
* bus number retrieved from pex_local_bus_num_get(). Other bus numbers
* will result configuration transaction of type 1 (over bridge).
*
* INPUT:
* pex_if - PEX interface number.
* bus - PEX segment bus number.
* dev - PEX device number.
* func - Function number.
* reg_offs - Register offset.
*
* OUTPUT:
* None.
*
* RETURN:
* 32bit register data, 0xffffffff on error
*/
u32 pex_config_read(u32 pex_if, u32 bus, u32 dev, u32 func, u32 reg_off)
{
u32 pex_data = 0;
u32 local_dev, local_bus;
u32 pex_status;
pex_status = reg_read(PEX_STATUS_REG(pex_if));
local_dev =
((pex_status & PXSR_PEX_DEV_NUM_MASK) >> PXSR_PEX_DEV_NUM_OFFS);
local_bus =
((pex_status & PXSR_PEX_BUS_NUM_MASK) >> PXSR_PEX_BUS_NUM_OFFS);
/*
* In PCI Express we have only one device number
* and this number is the first number we encounter
* else that the local_dev
* spec pex define return on config read/write on any device
*/
if (bus == local_bus) {
if (local_dev == 0) {
/*
* if local dev is 0 then the first number we encounter
* after 0 is 1
*/
if ((dev != 1) && (dev != local_dev))
return MV_ERROR;
} else {
/*
* if local dev is not 0 then the first number we
* encounter is 0
*/
if ((dev != 0) && (dev != local_dev))
return MV_ERROR;
}
}
/* Creating PEX address to be passed */
pex_data = (bus << PXCAR_BUS_NUM_OFFS);
pex_data |= (dev << PXCAR_DEVICE_NUM_OFFS);
pex_data |= (func << PXCAR_FUNC_NUM_OFFS);
/* Legacy register space */
pex_data |= (reg_off & PXCAR_REG_NUM_MASK);
/* Extended register space */
pex_data |= (((reg_off & PXCAR_REAL_EXT_REG_NUM_MASK) >>
PXCAR_REAL_EXT_REG_NUM_OFFS) << PXCAR_EXT_REG_NUM_OFFS);
pex_data |= PXCAR_CONFIG_EN;
/* Write the address to the PEX configuration address register */
reg_write(PEX_CFG_ADDR_REG(pex_if), pex_data);
/*
* In order to let the PEX controller absorbed the address
* of the read transaction we perform a validity check that
* the address was written
*/
if (pex_data != reg_read(PEX_CFG_ADDR_REG(pex_if)))
return MV_ERROR;
/* Cleaning Master Abort */
reg_bit_set(PEX_CFG_DIRECT_ACCESS(pex_if, PEX_STATUS_AND_COMMAND),
PXSAC_MABORT);
/* Read the Data returned in the PEX Data register */
pex_data = reg_read(PEX_CFG_DATA_REG(pex_if));
DEBUG_INIT_FULL_C(" --> ", pex_data, 4);
return pex_data;
}