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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2007-2009 Freescale Semiconductor, Inc.
* Copyright (C) 2008-2009 MontaVista Software, Inc.
*
* Authors: Tony Li <tony.li@freescale.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*/
#include <common.h>
#include <clock_legacy.h>
#include <pci.h>
#include <mpc83xx.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <linux/delay.h>
DECLARE_GLOBAL_DATA_PTR;
#define PCIE_MAX_BUSES 2
static struct {
u32 base;
u32 size;
} mpc83xx_pcie_cfg_space[] = {
{
.base = CFG_SYS_PCIE1_CFG_BASE,
.size = CFG_SYS_PCIE1_CFG_SIZE,
},
#if defined(CFG_SYS_PCIE2_CFG_BASE) && defined(CFG_SYS_PCIE2_CFG_SIZE)
{
.base = CFG_SYS_PCIE2_CFG_BASE,
.size = CFG_SYS_PCIE2_CFG_SIZE,
},
#endif
};
int get_pcie_clk(int index)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
u32 pci_sync_in;
u8 spmf;
u8 clkin_div;
u32 sccr;
u32 csb_clk;
u32 testval;
clkin_div = ((im->clk.spmr & SPMR_CKID) >> SPMR_CKID_SHIFT);
sccr = im->clk.sccr;
pci_sync_in = get_board_sys_clk() / (1 + clkin_div);
spmf = (im->clk.spmr & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
csb_clk = pci_sync_in * (1 + clkin_div) * spmf;
if (index)
testval = (sccr & SCCR_PCIEXP2CM) >> SCCR_PCIEXP2CM_SHIFT;
else
testval = (sccr & SCCR_PCIEXP1CM) >> SCCR_PCIEXP1CM_SHIFT;
switch (testval) {
case 0:
return 0;
case 1:
return csb_clk;
case 2:
return csb_clk / 2;
case 3:
return csb_clk / 3;
}
return 0;
}
static void mpc83xx_pcie_init_bus(int bus, struct pci_region *reg)
{
immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
pex83xx_t *pex = &immr->pciexp[bus];
struct pex_outbound_window *out_win;
struct pex_inbound_window *in_win;
void *hose_cfg_base;
unsigned int ram_sz;
unsigned int barl;
unsigned int tar;
u16 reg16;
int i;
/* Enable pex csb bridge inbound & outbound transactions */
out_le32(&pex->bridge.pex_csb_ctrl,
in_le32(&pex->bridge.pex_csb_ctrl) | PEX_CSB_CTRL_OBPIOE |
PEX_CSB_CTRL_IBPIOE);
/* Enable bridge outbound */
out_le32(&pex->bridge.pex_csb_obctrl, PEX_CSB_OBCTRL_PIOE |
PEX_CSB_OBCTRL_MEMWE | PEX_CSB_OBCTRL_IOWE |
PEX_CSB_OBCTRL_CFGWE);
out_win = &pex->bridge.pex_outbound_win[0];
out_le32(&out_win->ar, PEX_OWAR_EN | PEX_OWAR_TYPE_CFG |
mpc83xx_pcie_cfg_space[bus].size);
out_le32(&out_win->bar, mpc83xx_pcie_cfg_space[bus].base);
out_le32(&out_win->tarl, 0);
out_le32(&out_win->tarh, 0);
for (i = 0; i < 2; i++) {
u32 ar;
if (reg[i].size == 0)
break;
out_win = &pex->bridge.pex_outbound_win[i + 1];
out_le32(&out_win->bar, reg[i].phys_start);
out_le32(&out_win->tarl, reg[i].bus_start);
out_le32(&out_win->tarh, 0);
ar = PEX_OWAR_EN | (reg[i].size & PEX_OWAR_SIZE);
if (reg[i].flags & PCI_REGION_IO)
ar |= PEX_OWAR_TYPE_IO;
else
ar |= PEX_OWAR_TYPE_MEM;
out_le32(&out_win->ar, ar);
}
out_le32(&pex->bridge.pex_csb_ibctrl, PEX_CSB_IBCTRL_PIOE);
ram_sz = gd->ram_size;
barl = 0;
tar = 0;
i = 0;
while (ram_sz > 0) {
in_win = &pex->bridge.pex_inbound_win[i];
out_le32(&in_win->barl, barl);
out_le32(&in_win->barh, 0x0);
out_le32(&in_win->tar, tar);
if (ram_sz >= 0x10000000) {
/* The maxium windows size is 256M */
out_le32(&in_win->ar, PEX_IWAR_EN | PEX_IWAR_NSOV |
PEX_IWAR_TYPE_PF | 0x0FFFF000);
barl += 0x10000000;
tar += 0x10000000;
ram_sz -= 0x10000000;
} else {
/* The UM is not clear here.
* So, round up to even Mb boundary */
ram_sz = ram_sz >> (20 +
((ram_sz & 0xFFFFF) ? 1 : 0));
if (!(ram_sz % 2))
ram_sz -= 1;
out_le32(&in_win->ar, PEX_IWAR_EN | PEX_IWAR_NSOV |
PEX_IWAR_TYPE_PF | (ram_sz << 20) | 0xFF000);
ram_sz = 0;
}
i++;
}
in_win = &pex->bridge.pex_inbound_win[i];
out_le32(&in_win->barl, CONFIG_SYS_IMMR);
out_le32(&in_win->barh, 0);
out_le32(&in_win->tar, CONFIG_SYS_IMMR);
out_le32(&in_win->ar, PEX_IWAR_EN |
PEX_IWAR_TYPE_NO_PF | PEX_IWAR_SIZE_1M);
/* Enable the host virtual INTX interrupts */
out_le32(&pex->bridge.pex_int_axi_misc_enb,
in_le32(&pex->bridge.pex_int_axi_misc_enb) | 0x1E0);
/* Hose configure header is memory-mapped */
hose_cfg_base = (void *)pex;
/* Configure the PCIE controller core clock ratio */
out_le32(hose_cfg_base + PEX_GCLK_RATIO,
((get_pcie_clk(bus) / 1000000) * 16) / 333);
udelay(1000000);
/* Do Type 1 bridge configuration */
out_8(hose_cfg_base + PCI_PRIMARY_BUS, 0);
out_8(hose_cfg_base + PCI_SECONDARY_BUS, 1);
out_8(hose_cfg_base + PCI_SUBORDINATE_BUS, 255);
/*
* Write to Command register
*/
reg16 = in_le16(hose_cfg_base + PCI_COMMAND);
reg16 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO |
PCI_COMMAND_SERR | PCI_COMMAND_PARITY;
out_le16(hose_cfg_base + PCI_COMMAND, reg16);
/*
* Clear non-reserved bits in status register.
*/
out_le16(hose_cfg_base + PCI_STATUS, 0xffff);
out_8(hose_cfg_base + PCI_LATENCY_TIMER, 0x80);
out_8(hose_cfg_base + PCI_CACHE_LINE_SIZE, 0x08);
printf("PCIE%d: ", bus);
#define PCI_LTSSM 0x404 /* PCIe Link Training, Status State Machine */
#define PCI_LTSSM_L0 0x16 /* L0 state */
reg16 = in_le16(hose_cfg_base + PCI_LTSSM);
if (reg16 >= PCI_LTSSM_L0)
printf("link\n");
else
printf("No link\n");
}
/*
* The caller must have already set SCCR, SERDES and the PCIE_LAW BARs
* must have been set to cover all of the requested regions.
*/
void mpc83xx_pcie_init(int num_buses, struct pci_region **reg)
{
int i;
/*
* Release PCI RST Output signal.
* Power on to RST high must be at least 100 ms as per PCI spec.
* On warm boots only 1 ms is required, but we play it safe.
*/
udelay(100000);
if (num_buses > ARRAY_SIZE(mpc83xx_pcie_cfg_space)) {
printf("Second PCIE host contoller not configured!\n");
num_buses = ARRAY_SIZE(mpc83xx_pcie_cfg_space);
}
for (i = 0; i < num_buses; i++)
mpc83xx_pcie_init_bus(i, reg[i]);
}
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