gl9755.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/* Driver for Genesys Logic GL9755 */
 
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include "gl9755.h"
 
static void gl9755_enable(struct device *dev)
{
        uint32_t reg;
 
        printk(BIOS_INFO, "GL9755: configure ASPM and LTR\n");
 
        /* Set Vendor Config to be configurable */
        pci_or_config32(dev, CFG, CFG_EN);
 
        /* Set LTR value */
        pci_write_config32(dev, LTR, NO_SNOOP_SCALE|NO_SNOOP_VALUE|SNOOP_SCALE|SNOOP_VALUE);
 
        /* Adjust L1 exit latency to enable ASPM */
        reg = pci_read_config32(dev, CFG2);
        reg &= ~CFG2_LAT_L1_MASK;
        reg |= CFG2_LAT_L1_64US;
        pci_write_config32(dev, CFG2, reg);
 
        /* Disable ASPM L0s support */
        pci_and_config32(dev, CFG2, ~CFG2_L0S_SUPPORT);
 
        /* Turn off debug mode to enable SCP/OCP */
        pci_and_config32(dev, CFG3, ~SCP_DEBUG);
 
        /* Set Vendor Config to be non-configurable */
        pci_and_config32(dev, CFG, ~CFG_EN);
}
 
static struct device_operations gl9755_ops = {
        .read_resources         = pci_dev_read_resources,
        .set_resources          = pci_dev_set_resources,
        .enable_resources       = pci_dev_enable_resources,
        .ops_pci                = &pci_dev_ops_pci,
        .enable                 = gl9755_enable
};
 
static const unsigned short pci_device_ids[] = {
        PCI_DID_GLI_9755,
        0
};
 
static const struct pci_driver genesyslogic_gl9755 __pci_driver = {
        .ops            = &gl9755_ops,
        .vendor         = PCI_VID_GLI,
        .devices        = pci_device_ids,
};
 
struct chip_operations drivers_generic_genesyslogic_gl9755_ops = {
        CHIP_NAME("Genesys Logic GL9755")
};