diff options
Diffstat (limited to 'src/soc/intel/denverton_ns/systemagent.c')
| -rw-r--r-- | src/soc/intel/denverton_ns/systemagent.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/src/soc/intel/denverton_ns/systemagent.c b/src/soc/intel/denverton_ns/systemagent.c new file mode 100644 index 0000000000..bb5f81a81c --- /dev/null +++ b/src/soc/intel/denverton_ns/systemagent.c @@ -0,0 +1,356 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2007-2009 coresystems GmbH + * Copyright (C) 2014 Google Inc. + * Copyright (C) 2015 - 2017 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <console/console.h> +#include <arch/acpi.h> +#include <arch/io.h> +#include <stdint.h> +#include <delay.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <stdlib.h> +#include <string.h> +#include <cbmem.h> +#include <romstage_handoff.h> +#include <delay.h> +#include <timer.h> + +#include <soc/iomap.h> +#include <soc/pci_devs.h> +#include <soc/ramstage.h> +#include <soc/systemagent.h> + +#define _1ms 1 +#define WAITING_STEP 100 + +static int get_pcie_bar(device_t dev, unsigned int index, u32 *base, u32 *len) +{ + u32 pciexbar_reg; + + *base = 0; + *len = 0; + + pciexbar_reg = pci_read_config32(dev, index); + + if (!(pciexbar_reg & (1 << 0))) + return 0; + + switch ((pciexbar_reg >> 1) & 3) { + case 0: /* 256MB */ + *base = pciexbar_reg & + ((1 << 31) | (1 << 30) | (1 << 29) | (1 << 28)); + *len = 256 * 1024 * 1024; + return 1; + case 1: /* 128M */ + *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) | + (1 << 28) | (1 << 27)); + *len = 128 * 1024 * 1024; + return 1; + case 2: /* 64M */ + *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) | + (1 << 28) | (1 << 27) | (1 << 26)); + *len = 64 * 1024 * 1024; + return 1; + } + + return 0; +} + +static int get_bar(device_t dev, unsigned int index, u32 *base, u32 *len) +{ + u32 bar; + + bar = pci_read_config32(dev, index); + + /* If not enabled don't report it. */ + if (!(bar & 0x1)) + return 0; + + /* Knock down the enable bit. */ + *base = bar & ~1; + + return 1; +} + +struct fixed_mmio_descriptor { + unsigned int index; + u32 size; + int (*get_resource)(device_t dev, unsigned int index, u32 *base, + u32 *size); + const char *description; +}; + +struct fixed_mmio_descriptor mc_fixed_resources[] = { + {PCIEXBAR, 0, get_pcie_bar, "PCIEXBAR"}, + {MCHBAR, MCH_BASE_SIZE, get_bar, "MCHBAR"}, +}; + +/* + * Add all known fixed MMIO ranges that hang off the host bridge/memory + * controller device. + */ +static void mc_add_fixed_mmio_resources(device_t dev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(mc_fixed_resources); i++) { + u32 base; + u32 size; + struct resource *resource; + unsigned int index; + + size = mc_fixed_resources[i].size; + index = mc_fixed_resources[i].index; + if (!mc_fixed_resources[i].get_resource(dev, index, &base, + &size)) + continue; + + resource = new_resource(dev, mc_fixed_resources[i].index); + resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_RESERVE | + IORESOURCE_ASSIGNED; + resource->base = base; + resource->size = size; + printk(BIOS_DEBUG, "%s: Adding %s @ %x 0x%08lx-0x%08lx.\n", + __func__, mc_fixed_resources[i].description, index, + (unsigned long)base, (unsigned long)(base + size - 1)); + } +} + +struct map_entry { + int reg; + int is_64_bit; + int is_limit; + const char *description; +}; + +static void read_map_entry(device_t dev, struct map_entry *entry, + uint64_t *result) +{ + uint64_t value; + uint64_t mask; + + /* All registers are on a 1MiB granularity. */ + mask = ((1ULL << 20) - 1); + mask = ~mask; + + value = 0; + + if (entry->is_64_bit) { + value = pci_read_config32(dev, entry->reg + 4); + value <<= 32; + } + + value |= (uint64_t)pci_read_config32(dev, entry->reg); + value &= mask; + + if (entry->is_limit) + value |= ~mask; + + *result = value; +} + +#define MAP_ENTRY(reg_, is_64_, is_limit_, desc_) \ + { \ + .reg = reg_, .is_64_bit = is_64_, .is_limit = is_limit_, \ + .description = desc_, \ + } + +#define MAP_ENTRY_BASE_64(reg_, desc_) MAP_ENTRY(reg_, 1, 0, desc_) +#define MAP_ENTRY_LIMIT_64(reg_, desc_) MAP_ENTRY(reg_, 1, 1, desc_) +#define MAP_ENTRY_BASE_32(reg_, desc_) MAP_ENTRY(reg_, 0, 0, desc_) + +enum { + TOUUD_REG, + TOLUD_REG, + TSEG_REG, + /* Must be last. */ + NUM_MAP_ENTRIES +}; + +static struct map_entry memory_map[NUM_MAP_ENTRIES] = { + [TOUUD_REG] = MAP_ENTRY_BASE_64(TOUUD, "TOUUD"), + [TOLUD_REG] = MAP_ENTRY_BASE_32(TOLUD, "TOLUD"), + [TSEG_REG] = MAP_ENTRY_BASE_32(TSEGMB, "TSEGMB"), +}; + +static void mc_read_map_entries(device_t dev, uint64_t *values) +{ + int i; + for (i = 0; i < NUM_MAP_ENTRIES; i++) + read_map_entry(dev, &memory_map[i], &values[i]); +} + +static void mc_report_map_entries(device_t dev, uint64_t *values) +{ + int i; + for (i = 0; i < NUM_MAP_ENTRIES; i++) { + printk(BIOS_DEBUG, "MC MAP: %s: 0x%llx\n", + memory_map[i].description, values[i]); + } +} + +static void mc_add_dram_resources(device_t dev) +{ + unsigned long base_k, size_k; + unsigned long touud_k; + unsigned long index; + struct resource *resource; + uint64_t mc_values[NUM_MAP_ENTRIES]; + + /* Read in the MAP registers and report their values. */ + mc_read_map_entries(dev, &mc_values[0]); + mc_report_map_entries(dev, &mc_values[0]); + + /* + * These are the host memory ranges that should be added: + * - 0 -> 0xa0000: cacheable + * - 0xc0000 -> 0x100000 : reserved + * - 0x100000 -> top_of_ram : cacheable + * - top_of_ram -> TSEG: uncacheable + * - TESG -> TOLUD: cacheable with standard MTRRs and reserved + * - 4GiB -> TOUUD: cacheable + * + * The default SMRAM space is reserved so that the range doesn't + * have to be saved during S3 Resume. Once marked reserved the OS + * cannot use the memory. This is a bit of an odd place to reserve + * the region, but the CPU devices don't have dev_ops->read_resources() + * called on them. + * + * The range 0xa0000 -> 0xc0000 does not have any resources + * associated with it to handle legacy VGA memory. If this range + * is not omitted the mtrr code will setup the area as cacheable + * causing VGA access to not work. + * + * The TSEG region is mapped as cacheable so that one can perform + * SMRAM relocation faster. Once the SMRR is enabled the SMRR takes + * precedence over the existing MTRRs covering this region. + * + * It should be noted that cacheable entry types need to be added in + * order. The reason is that the current MTRR code assumes this and + * falls over itself if it isn't. + * + * The resource index starts low and should not meet or exceed + * PCI_BASE_ADDRESS_0. + */ + index = 0; + + /* 0 - > 0xa0000 */ + base_k = 0; + size_k = (0xa0000 >> 10) - base_k; + ram_resource(dev, index++, base_k, size_k); + + /* 0x100000 -> top_of_ram */ + base_k = 0x100000 >> 10; + size_k = (top_of_32bit_ram() >> 10) - base_k; + ram_resource(dev, index++, base_k, size_k); + + /* top_of_ram -> TSEG */ + resource = new_resource(dev, index++); + resource->base = top_of_32bit_ram(); + resource->size = mc_values[TSEG_REG] - resource->base; + resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_RESERVE | + IORESOURCE_ASSIGNED; + + /* TSEG -> TOLUD */ + resource = new_resource(dev, index++); + resource->base = mc_values[TSEG_REG]; + resource->size = mc_values[TOLUD_REG] - resource->base; + resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_RESERVE | + IORESOURCE_ASSIGNED | IORESOURCE_CACHEABLE; + printk(BIOS_DEBUG, + "SMM memory location: 0x%llx SMM memory size: 0x%llx\n", + resource->base, resource->size); + + /* 4GiB -> TOUUD */ + base_k = 4096 * 1024; /* 4GiB */ + touud_k = mc_values[TOUUD_REG] >> 10; + size_k = touud_k - base_k; + if (touud_k > base_k) + ram_resource(dev, index++, base_k, size_k); + + /* + * Reserve everything between A segment and 1MB: + * + * 0xa0000 - 0xbffff: legacy VGA + * 0xc0000 - 0xfffff: reserved RAM + */ + mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10); + reserved_ram_resource(dev, index++, (0xc0000 >> 10), + (0x100000 - 0xc0000) >> 10); +} + +static void systemagent_read_resources(device_t dev) +{ + /* Read standard PCI resources. */ + pci_dev_read_resources(dev); + + /* Add all fixed MMIO resources. */ + mc_add_fixed_mmio_resources(dev); + + /* Calculate and add DRAM resources. */ + mc_add_dram_resources(dev); +} + +static void systemagent_init(struct device *dev) +{ + struct stopwatch sw; + void *bios_reset_cpl = + (void *)(DEFAULT_MCHBAR + MCH_BAR_BIOS_RESET_CPL); + uint32_t reg = read32(bios_reset_cpl); + + /* Stage0 BIOS Reset Complete (RST_CPL) */ + reg |= RST_CPL_BIT; + write32(bios_reset_cpl, reg); + + /* + * Poll for bit 8 in same reg (RST_CPL). + * We wait here till 1 ms for the bit to get set. + */ + stopwatch_init_msecs_expire(&sw, _1ms); + while (!(read32(bios_reset_cpl) & PCODE_INIT_DONE)) { + if (stopwatch_expired(&sw)) { + printk(BIOS_DEBUG, "Failed to set RST_CPL bit\n"); + return; + } + udelay(WAITING_STEP); + } + printk(BIOS_DEBUG, "Set BIOS_RESET_CPL\n"); +} + +static struct device_operations systemagent_ops = { + .read_resources = &systemagent_read_resources, + .set_resources = &pci_dev_set_resources, + .enable_resources = &pci_dev_enable_resources, + .init = &systemagent_init, + .ops_pci = &soc_pci_ops, +}; + +/* IDs for System Agent device of Intel Denverton SoC */ +static const unsigned short systemagent_ids[] = { + SA_DEVID, /* DVN System Agent */ + 0 +}; + +static const struct pci_driver systemagent_driver __pci_driver = { + .ops = &systemagent_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .devices = systemagent_ids +}; |