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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2015 Nikolay Martynov <mar.kolya@gmail.com>
* Copyright (C) 2015 John Crispin <john@phrozen.org>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/memblock.h>
#include <linux/pci.h>
#include <linux/bug.h>
#include <asm/bootinfo.h>
#include <asm/mipsregs.h>
#include <asm/smp-ops.h>
#include <asm/mips-cps.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/mt7621.h>
#include "common.h"
#define MT7621_MEM_TEST_PATTERN 0xaa5555aa
static u32 detect_magic __initdata;
static struct ralink_soc_info *soc_info_ptr;
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct resource_entry *entry;
resource_size_t mask;
entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
if (!entry) {
pr_err("Cannot get memory resource\n");
return -EINVAL;
}
if (mips_cps_numiocu(0)) {
/*
* Hardware doesn't accept mask values with 1s after
* 0s (e.g. 0xffef), so warn if that's happen
*/
mask = ~(entry->res->end - entry->res->start) & CM_GCR_REGn_MASK_ADDRMASK;
WARN_ON(mask && BIT(ffz(~mask)) - 1 != ~mask);
write_gcr_reg1_base(entry->res->start);
write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
pr_info("PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
(unsigned long long)read_gcr_reg1_base(),
(unsigned long long)read_gcr_reg1_mask());
}
return 0;
}
phys_addr_t mips_cpc_default_phys_base(void)
{
panic("Cannot detect cpc address");
}
static bool __init mt7621_addr_wraparound_test(phys_addr_t size)
{
void *dm = (void *)KSEG1ADDR(&detect_magic);
if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE)
return true;
__raw_writel(MT7621_MEM_TEST_PATTERN, dm);
if (__raw_readl(dm) != __raw_readl(dm + size))
return false;
__raw_writel(~MT7621_MEM_TEST_PATTERN, dm);
return __raw_readl(dm) == __raw_readl(dm + size);
}
static void __init mt7621_memory_detect(void)
{
phys_addr_t size;
for (size = 32 * SZ_1M; size <= 256 * SZ_1M; size <<= 1) {
if (mt7621_addr_wraparound_test(size)) {
memblock_add(MT7621_LOWMEM_BASE, size);
return;
}
}
memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE);
memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE);
}
static unsigned int __init mt7621_get_soc_name0(void)
{
return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_NAME0);
}
static unsigned int __init mt7621_get_soc_name1(void)
{
return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_NAME1);
}
static bool __init mt7621_soc_valid(void)
{
if (mt7621_get_soc_name0() == MT7621_CHIP_NAME0 &&
mt7621_get_soc_name1() == MT7621_CHIP_NAME1)
return true;
else
return false;
}
static const char __init *mt7621_get_soc_id(void)
{
if (mt7621_soc_valid())
return "MT7621";
else
return "invalid";
}
static unsigned int __init mt7621_get_soc_rev(void)
{
return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_REV);
}
static unsigned int __init mt7621_get_soc_ver(void)
{
return (mt7621_get_soc_rev() >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK;
}
static unsigned int __init mt7621_get_soc_eco(void)
{
return (mt7621_get_soc_rev() & CHIP_REV_ECO_MASK);
}
static const char __init *mt7621_get_soc_revision(void)
{
if (mt7621_get_soc_rev() == 1 && mt7621_get_soc_eco() == 1)
return "E2";
else
return "E1";
}
static int __init mt7621_soc_dev_init(void)
{
struct soc_device *soc_dev;
struct soc_device_attribute *soc_dev_attr;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->soc_id = "mt7621";
soc_dev_attr->family = "Ralink";
soc_dev_attr->revision = mt7621_get_soc_revision();
soc_dev_attr->data = soc_info_ptr;
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr);
return PTR_ERR(soc_dev);
}
return 0;
}
device_initcall(mt7621_soc_dev_init);
void __init prom_soc_init(struct ralink_soc_info *soc_info)
{
/* Early detection of CMP support */
mips_cm_probe();
mips_cpc_probe();
if (mips_cps_numiocu(0)) {
/*
* mips_cm_probe() wipes out bootloader
* config for CM regions and we have to configure them
* again. This SoC cannot talk to pamlbus devices
* without proper iocu region set up.
*
* FIXME: it would be better to do this with values
* from DT, but we need this very early because
* without this we cannot talk to pretty much anything
* including serial.
*/
write_gcr_reg0_base(MT7621_PALMBUS_BASE);
write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE |
CM_GCR_REGn_MASK_CMTGT_IOCU0);
__sync();
}
if (mt7621_soc_valid())
soc_info->compatible = "mediatek,mt7621-soc";
else
panic("mt7621: unknown SoC, n0:%08x n1:%08x\n",
mt7621_get_soc_name0(),
mt7621_get_soc_name1());
ralink_soc = MT762X_SOC_MT7621AT;
snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
"MediaTek %s ver:%u eco:%u",
mt7621_get_soc_id(),
mt7621_get_soc_ver(),
mt7621_get_soc_eco());
soc_info->mem_detect = mt7621_memory_detect;
soc_info_ptr = soc_info;
if (!register_cps_smp_ops())
return;
if (!register_vsmp_smp_ops())
return;
}
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