diff options
Diffstat (limited to 'src/soc/intel/braswell/lpe.c')
| -rw-r--r-- | src/soc/intel/braswell/lpe.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/soc/intel/braswell/lpe.c b/src/soc/intel/braswell/lpe.c new file mode 100644 index 0000000000..c23fdb2be6 --- /dev/null +++ b/src/soc/intel/braswell/lpe.c @@ -0,0 +1,189 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <cbmem.h> +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <reg_script.h> + +#include <soc/iomap.h> +#include <soc/iosf.h> +#include <soc/lpc.h> +#include <soc/nvs.h> +#include <soc/pattrs.h> +#include <soc/pci_devs.h> +#include <soc/pmc.h> +#include <soc/ramstage.h> +#include "chip.h" + + +/* The LPE audio devices needs 1MiB of memory reserved aligned to a 512MiB + * address. Just take 1MiB @ 512MiB. */ +#define FIRMWARE_PHYS_BASE (512 << 20) +#define FIRMWARE_PHYS_LENGTH (1 << 20) +#define FIRMWARE_PCI_REG_BASE 0xa8 +#define FIRMWARE_PCI_REG_LENGTH 0xac +#define FIRMWARE_REG_BASE_C0 0x144000 +#define FIRMWARE_REG_LENGTH_C0 (FIRMWARE_REG_BASE_C0 + 4) + +static void assign_device_nvs(device_t dev, u32 *field, unsigned index) +{ + struct resource *res; + + res = find_resource(dev, index); + if (res) + *field = res->base; +} + +static void lpe_enable_acpi_mode(device_t dev) +{ + static const struct reg_script ops[] = { + /* Disable PCI interrupt, enable Memory and Bus Master */ + REG_PCI_OR32(PCI_COMMAND, + PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | (1<<10)), + /* Enable ACPI mode */ + REG_IOSF_OR(IOSF_PORT_0x58, LPE_PCICFGCTR1, + LPE_PCICFGCTR1_PCI_CFG_DIS | + LPE_PCICFGCTR1_ACPI_INT_EN), + REG_SCRIPT_END + }; + global_nvs_t *gnvs; + + /* Find ACPI NVS to update BARs */ + gnvs = (global_nvs_t *)cbmem_find(CBMEM_ID_ACPI_GNVS); + if (!gnvs) { + printk(BIOS_ERR, "Unable to locate Global NVS\n"); + return; + } + + /* Save BAR0, BAR1, and firmware base to ACPI NVS */ + assign_device_nvs(dev, &gnvs->dev.lpe_bar0, PCI_BASE_ADDRESS_0); + assign_device_nvs(dev, &gnvs->dev.lpe_bar1, PCI_BASE_ADDRESS_1); + assign_device_nvs(dev, &gnvs->dev.lpe_fw, FIRMWARE_PCI_REG_BASE); + + /* Device is enabled in ACPI mode */ + gnvs->dev.lpe_en = 1; + + /* Put device in ACPI mode */ + reg_script_run_on_dev(dev, ops); +} + +static void setup_codec_clock(device_t dev) +{ + uint32_t reg; + u32 *clk_reg; + struct soc_intel_baytrail_config *config; + const char *freq_str; + + config = dev->chip_info; + switch (config->lpe_codec_clk_freq) { + case 19: + freq_str = "19.2"; + reg = CLK_FREQ_19P2MHZ; + break; + case 25: + freq_str = "25"; + reg = CLK_FREQ_25MHZ; + break; + default: + printk(BIOS_DEBUG, "LPE codec clock not required.\n"); + return; + } + + /* Default to always running. */ + reg |= CLK_CTL_ON; + + if (config->lpe_codec_clk_num < 0 || config->lpe_codec_clk_num > 5) { + printk(BIOS_DEBUG, "Invalid LPE codec clock number.\n"); + return; + } + + printk(BIOS_DEBUG, "LPE Audio codec clock set to %sMHz.\n", freq_str); + + clk_reg = (u32 *)(PMC_BASE_ADDRESS + PLT_CLK_CTL_0); + clk_reg += config->lpe_codec_clk_num; + + write32(clk_reg, (read32(clk_reg) & ~0x7) | reg); +} + +static void lpe_stash_firmware_info(device_t dev) +{ + struct resource *res; + struct resource *mmio; + const struct pattrs *pattrs = pattrs_get(); + + res = find_resource(dev, FIRMWARE_PCI_REG_BASE); + if (res == NULL) { + printk(BIOS_DEBUG, "LPE Firmware memory not found.\n"); + return; + } + + /* Continue using old way of informing firmware address / size. */ + pci_write_config32(dev, FIRMWARE_PCI_REG_BASE, res->base); + pci_write_config32(dev, FIRMWARE_PCI_REG_LENGTH, res->size); + + /* C0 and later steppings use an offset in the MMIO space. */ + if (pattrs->stepping >= STEP_C0) { + mmio = find_resource(dev, PCI_BASE_ADDRESS_0); + write32((u32 *)(uintptr_t)(mmio->base + FIRMWARE_REG_BASE_C0), + res->base); + write32((u32 *)(uintptr_t)(mmio->base + FIRMWARE_REG_LENGTH_C0), + res->size); + } +} + +static void lpe_init(device_t dev) +{ + struct soc_intel_baytrail_config *config = dev->chip_info; + + lpe_stash_firmware_info(dev); + + setup_codec_clock(dev); + + if (config->lpe_acpi_mode) + lpe_enable_acpi_mode(dev); +} + +static void lpe_read_resources(device_t dev) +{ + pci_dev_read_resources(dev); + + reserved_ram_resource(dev, FIRMWARE_PCI_REG_BASE, + FIRMWARE_PHYS_BASE >> 10, + FIRMWARE_PHYS_LENGTH >> 10); +} + +static const struct device_operations device_ops = { + .read_resources = lpe_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_dev_enable_resources, + .init = lpe_init, + .enable = NULL, + .scan_bus = NULL, + .ops_pci = &soc_pci_ops, +}; + +static const struct pci_driver southcluster __pci_driver = { + .ops = &device_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .device = LPE_DEVID, +}; |