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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) Freescale Semiconductor, Inc. 2007
*
* Author: Scott Wood <scottwood@freescale.com>,
* with some bits from older board-specific PCI initialization.
*/
#include <common.h>
#include <init.h>
#include <pci.h>
#include <asm/bitops.h>
#include <linux/delay.h>
#if defined(CONFIG_OF_LIBFDT)
#include <linux/libfdt.h>
#include <fdt_support.h>
#endif
#include <asm/mpc8349_pci.h>
#define MAX_BUSES 2
DECLARE_GLOBAL_DATA_PTR;
static struct pci_controller pci_hose[MAX_BUSES];
static int pci_num_buses;
static void pci_init_bus(int bus, struct pci_region *reg)
{
volatile immap_t *immr = (volatile immap_t *)CONFIG_SYS_IMMR;
volatile pot83xx_t *pot = immr->ios.pot;
volatile pcictrl83xx_t *pci_ctrl = &immr->pci_ctrl[bus];
struct pci_controller *hose = &pci_hose[bus];
u32 dev;
u16 reg16;
int i;
if (bus == 1)
pot += 3;
/* Setup outbound translation windows */
for (i = 0; i < 3; i++, reg++, pot++) {
if (reg->size == 0)
break;
hose->regions[i] = *reg;
hose->region_count++;
pot->potar = reg->bus_start >> 12;
pot->pobar = reg->phys_start >> 12;
pot->pocmr = ~(reg->size - 1) >> 12;
if (reg->flags & PCI_REGION_IO)
pot->pocmr |= POCMR_IO;
#ifdef CONFIG_83XX_PCI_STREAMING
else if (reg->flags & PCI_REGION_PREFETCH)
pot->pocmr |= POCMR_SE;
#endif
if (bus == 1)
pot->pocmr |= POCMR_DST;
pot->pocmr |= POCMR_EN;
}
/* Point inbound translation at RAM */
pci_ctrl->pitar1 = 0;
pci_ctrl->pibar1 = 0;
pci_ctrl->piebar1 = 0;
pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
PIWAR_WTT_SNOOP | (__ilog2(gd->ram_size - 1));
i = hose->region_count++;
hose->regions[i].bus_start = 0;
hose->regions[i].phys_start = 0;
hose->regions[i].size = gd->ram_size;
hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_SYS_MEMORY;
hose->first_busno = pci_last_busno() + 1;
hose->last_busno = 0xff;
pci_setup_indirect(hose, CONFIG_SYS_IMMR + 0x8300 + bus * 0x80,
CONFIG_SYS_IMMR + 0x8304 + bus * 0x80);
pci_register_hose(hose);
/*
* Write to Command register
*/
reg16 = 0xff;
dev = PCI_BDF(hose->first_busno, 0, 0);
pci_hose_read_config_word(hose, dev, PCI_COMMAND, ®16);
reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);
/*
* Clear non-reserved bits in status register.
*/
pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
#ifdef CONFIG_PCI_SCAN_SHOW
printf("PCI: Bus Dev VenId DevId Class Int\n");
#endif
#ifndef CONFIG_PCISLAVE
/*
* Hose scan.
*/
hose->last_busno = pci_hose_scan(hose);
#endif
}
/*
* The caller must have already set OCCR, and the PCI_LAW BARs
* must have been set to cover all of the requested regions.
*
* If fewer than three regions are requested, then the region
* list is terminated with a region of size 0.
*/
void mpc83xx_pci_init(int num_buses, struct pci_region **reg)
{
volatile immap_t *immr = (volatile immap_t *)CONFIG_SYS_IMMR;
int i;
if (num_buses > MAX_BUSES) {
printf("%d PCI buses requested, %d supported\n",
num_buses, MAX_BUSES);
num_buses = MAX_BUSES;
}
pci_num_buses = num_buses;
/*
* 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);
for (i = 0; i < num_buses; i++)
immr->pci_ctrl[i].gcr = 1;
/*
* RST high to first config access must be at least 2^25 cycles
* as per PCI spec. This could be cut in half if we know we're
* running at 66MHz. This could be insufficiently long if we're
* running the PCI bus at significantly less than 33MHz.
*/
udelay(1020000);
for (i = 0; i < num_buses; i++)
pci_init_bus(i, reg[i]);
}
#ifdef CONFIG_PCISLAVE
#define PCI_FUNCTION_CONFIG 0x44
#define PCI_FUNCTION_CFG_LOCK 0x20
/*
* Unlock the configuration bit so that the host system can begin booting
*
* This should be used after you have:
* 1) Called mpc83xx_pci_init()
* 2) Set up your inbound translation windows to the appropriate size
*/
void mpc83xx_pcislave_unlock(int bus)
{
struct pci_controller *hose = &pci_hose[bus];
u32 dev;
u16 reg16;
/* Unlock configuration lock in PCI function configuration register */
dev = PCI_BDF(hose->first_busno, 0, 0);
pci_hose_read_config_word (hose, dev, PCI_FUNCTION_CONFIG, ®16);
reg16 &= ~(PCI_FUNCTION_CFG_LOCK);
pci_hose_write_config_word (hose, dev, PCI_FUNCTION_CONFIG, reg16);
/* The configuration bit is now unlocked, so we can scan the bus */
hose->last_busno = pci_hose_scan(hose);
}
#endif
#if defined(CONFIG_OF_LIBFDT)
void ft_pci_setup(void *blob, struct bd_info *bd)
{
int nodeoffset;
int tmp[2];
const char *path;
if (pci_num_buses < 1)
return;
nodeoffset = fdt_path_offset(blob, "/aliases");
if (nodeoffset >= 0) {
path = fdt_getprop(blob, nodeoffset, "pci0", NULL);
if (path) {
tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
do_fixup_by_path(blob, path, "bus-range",
&tmp, sizeof(tmp), 1);
tmp[0] = cpu_to_be32(gd->pci_clk);
do_fixup_by_path(blob, path, "clock-frequency",
&tmp, sizeof(tmp[0]), 1);
}
if (pci_num_buses < 2)
return;
path = fdt_getprop(blob, nodeoffset, "pci1", NULL);
if (path) {
tmp[0] = cpu_to_be32(pci_hose[1].first_busno);
tmp[1] = cpu_to_be32(pci_hose[1].last_busno);
do_fixup_by_path(blob, path, "bus-range",
&tmp, sizeof(tmp), 1);
tmp[0] = cpu_to_be32(gd->pci_clk);
do_fixup_by_path(blob, path, "clock-frequency",
&tmp, sizeof(tmp[0]), 1);
}
}
}
#endif /* CONFIG_OF_LIBFDT */
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