1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Copyright (C) 2015 Nikolay Martynov <mar.kolya@gmail.com>
  5 * Copyright (C) 2015 John Crispin <john@phrozen.org>
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/init.h>
 10#include <linux/slab.h>
 11#include <linux/sys_soc.h>
 12#include <linux/memblock.h>
 13#include <linux/pci.h>
 14#include <linux/bug.h>
 15
 16#include <asm/bootinfo.h>
 17#include <asm/mipsregs.h>
 18#include <asm/smp-ops.h>
 19#include <asm/mips-cps.h>
 20#include <asm/mach-ralink/ralink_regs.h>
 21#include <asm/mach-ralink/mt7621.h>
 22
 23#include "common.h"
 24
 25#define MT7621_MEM_TEST_PATTERN         0xaa5555aa
 26
 27static u32 detect_magic __initdata;
 28static struct ralink_soc_info *soc_info_ptr;
 29
 30int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 31{
 32	struct resource_entry *entry;
 33	resource_size_t mask;
 34
 35	entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
 36	if (!entry) {
 37		pr_err("Cannot get memory resource\n");
 38		return -EINVAL;
 39	}
 40
 41	if (mips_cps_numiocu(0)) {
 42		/*
 43		 * Hardware doesn't accept mask values with 1s after
 44		 * 0s (e.g. 0xffef), so warn if that's happen
 45		 */
 46		mask = ~(entry->res->end - entry->res->start) & CM_GCR_REGn_MASK_ADDRMASK;
 47		WARN_ON(mask && BIT(ffz(~mask)) - 1 != ~mask);
 48
 49		write_gcr_reg1_base(entry->res->start);
 50		write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
 51		pr_info("PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
 52			(unsigned long long)read_gcr_reg1_base(),
 53			(unsigned long long)read_gcr_reg1_mask());
 54	}
 55
 56	return 0;
 57}
 58
 59phys_addr_t mips_cpc_default_phys_base(void)
 60{
 61	panic("Cannot detect cpc address");
 62}
 63
 64static bool __init mt7621_addr_wraparound_test(phys_addr_t size)
 65{
 66	void *dm = (void *)KSEG1ADDR(&detect_magic);
 67
 68	if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE)
 69		return true;
 70	__raw_writel(MT7621_MEM_TEST_PATTERN, dm);
 71	if (__raw_readl(dm) != __raw_readl(dm + size))
 72		return false;
 73	__raw_writel(~MT7621_MEM_TEST_PATTERN, dm);
 74	return __raw_readl(dm) == __raw_readl(dm + size);
 75}
 76
 77static void __init mt7621_memory_detect(void)
 78{
 79	phys_addr_t size;
 80
 81	for (size = 32 * SZ_1M; size <= 256 * SZ_1M; size <<= 1) {
 82		if (mt7621_addr_wraparound_test(size)) {
 83			memblock_add(MT7621_LOWMEM_BASE, size);
 84			return;
 85		}
 86	}
 87
 88	memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE);
 89	memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE);
 90}
 91
 92static unsigned int __init mt7621_get_soc_name0(void)
 93{
 94	return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_NAME0);
 95}
 96
 97static unsigned int __init mt7621_get_soc_name1(void)
 98{
 99	return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_NAME1);
100}
101
102static bool __init mt7621_soc_valid(void)
103{
104	if (mt7621_get_soc_name0() == MT7621_CHIP_NAME0 &&
105			mt7621_get_soc_name1() == MT7621_CHIP_NAME1)
106		return true;
107	else
108		return false;
109}
110
111static const char __init *mt7621_get_soc_id(void)
112{
113	if (mt7621_soc_valid())
114		return "MT7621";
115	else
116		return "invalid";
117}
118
119static unsigned int __init mt7621_get_soc_rev(void)
120{
121	return __raw_readl(MT7621_SYSC_BASE + SYSC_REG_CHIP_REV);
122}
123
124static unsigned int __init mt7621_get_soc_ver(void)
125{
126	return (mt7621_get_soc_rev() >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK;
127}
128
129static unsigned int __init mt7621_get_soc_eco(void)
130{
131	return (mt7621_get_soc_rev() & CHIP_REV_ECO_MASK);
132}
133
134static const char __init *mt7621_get_soc_revision(void)
135{
136	if (mt7621_get_soc_rev() == 1 && mt7621_get_soc_eco() == 1)
137		return "E2";
138	else
139		return "E1";
140}
141
142static int __init mt7621_soc_dev_init(void)
143{
144	struct soc_device *soc_dev;
145	struct soc_device_attribute *soc_dev_attr;
146
147	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
148	if (!soc_dev_attr)
149		return -ENOMEM;
150
151	soc_dev_attr->soc_id = "mt7621";
152	soc_dev_attr->family = "Ralink";
153	soc_dev_attr->revision = mt7621_get_soc_revision();
154
155	soc_dev_attr->data = soc_info_ptr;
156
157	soc_dev = soc_device_register(soc_dev_attr);
158	if (IS_ERR(soc_dev)) {
159		kfree(soc_dev_attr);
160		return PTR_ERR(soc_dev);
161	}
162
163	return 0;
164}
165device_initcall(mt7621_soc_dev_init);
166
167void __init prom_soc_init(struct ralink_soc_info *soc_info)
168{
169	/* Early detection of CMP support */
170	mips_cm_probe();
171	mips_cpc_probe();
172
173	if (mips_cps_numiocu(0)) {
174		/*
175		 * mips_cm_probe() wipes out bootloader
176		 * config for CM regions and we have to configure them
177		 * again. This SoC cannot talk to pamlbus devices
178		 * without proper iocu region set up.
179		 *
180		 * FIXME: it would be better to do this with values
181		 * from DT, but we need this very early because
182		 * without this we cannot talk to pretty much anything
183		 * including serial.
184		 */
185		write_gcr_reg0_base(MT7621_PALMBUS_BASE);
186		write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE |
187				    CM_GCR_REGn_MASK_CMTGT_IOCU0);
188		__sync();
189	}
190
191	if (mt7621_soc_valid())
192		soc_info->compatible = "mediatek,mt7621-soc";
193	else
194		panic("mt7621: unknown SoC, n0:%08x n1:%08x\n",
195				mt7621_get_soc_name0(),
196				mt7621_get_soc_name1());
197	ralink_soc = MT762X_SOC_MT7621AT;
198
199	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
200		"MediaTek %s ver:%u eco:%u",
201		mt7621_get_soc_id(),
202		mt7621_get_soc_ver(),
203		mt7621_get_soc_eco());
204
205	soc_info->mem_detect = mt7621_memory_detect;
206
207	soc_info_ptr = soc_info;
208
209	if (!register_cps_smp_ops())
210		return;
211	if (!register_vsmp_smp_ops())
212		return;
213}