Rename devices -> device

to match src/include/device

Change-Id: I5d0e5b4361c34881a3b81347aac48738cb5b9af0
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1960
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

1 files changed, 252 insertions, 0 deletions

diff --git a/src/device/pciexp_device.c b/src/device/pciexp_device.c
new file mode 100644
index 0000000000..36f3e6a455
--- /dev/null
+++ b/src/device/pciexp_device.c
@@ -0,0 +1,252 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2005 Linux Networx
+ * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
+ *
+ * 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 <console/console.h>
+#include <delay.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pciexp.h>
+
+#if CONFIG_PCIEXP_COMMON_CLOCK
+/*
+ * Re-train a PCIe link
+ */
+#define PCIE_TRAIN_RETRY 10000
+static int pciexp_retrain_link(device_t dev, unsigned cap)
+{
+	unsigned try = PCIE_TRAIN_RETRY;
+	u16 lnk;
+
+	/* Start link retraining */
+	lnk = pci_read_config16(dev, cap + PCI_EXP_LNKCTL);
+	lnk |= PCI_EXP_LNKCTL_RL;
+	pci_write_config16(dev, cap + PCI_EXP_LNKCTL, lnk);
+
+	/* Wait for training to complete */
+	while (try--) {
+		lnk = pci_read_config16(dev, cap + PCI_EXP_LNKSTA);
+		if (!(lnk & PCI_EXP_LNKSTA_LT))
+			return 0;
+		udelay(100);
+	}
+
+	printk(BIOS_ERR, "%s: Link Retrain timeout\n", dev_path(dev));
+	return -1;
+}
+
+/*
+ * Check the Slot Clock Configuration for root port and endpoint
+ * and enable Common Clock Configuration if possible.  If CCC is
+ * enabled the link must be retrained.
+ */
+static void pciexp_enable_common_clock(device_t root, unsigned root_cap,
+				       device_t endp, unsigned endp_cap)
+{
+	u16 root_scc, endp_scc, lnkctl;
+
+	/* Get Slot Clock Configuration for root port */
+	root_scc = pci_read_config16(root, root_cap + PCI_EXP_LNKSTA);
+	root_scc &= PCI_EXP_LNKSTA_SLC;
+
+	/* Get Slot Clock Configuration for endpoint */
+	endp_scc = pci_read_config16(endp, endp_cap + PCI_EXP_LNKSTA);
+	endp_scc &= PCI_EXP_LNKSTA_SLC;
+
+	/* Enable Common Clock Configuration and retrain */
+	if (root_scc && endp_scc) {
+		printk(BIOS_INFO, "Enabling Common Clock Configuration\n");
+
+		/* Set in endpoint */
+		lnkctl = pci_read_config16(endp, endp_cap + PCI_EXP_LNKCTL);
+		lnkctl |= PCI_EXP_LNKCTL_CCC;
+		pci_write_config16(endp, endp_cap + PCI_EXP_LNKCTL, lnkctl);
+
+		/* Set in root port */
+		lnkctl = pci_read_config16(root, root_cap + PCI_EXP_LNKCTL);
+		lnkctl |= PCI_EXP_LNKCTL_CCC;
+		pci_write_config16(root, root_cap + PCI_EXP_LNKCTL, lnkctl);
+
+		/* Retrain link if CCC was enabled */
+		pciexp_retrain_link(root, root_cap);
+	}
+}
+#endif /* CONFIG_PCIEXP_COMMON_CLOCK */
+
+#if CONFIG_PCIEXP_ASPM
+/*
+ * Determine the ASPM L0s or L1 exit latency for a link
+ * by checking both root port and endpoint and returning
+ * the highest latency value.
+ */
+static int pciexp_aspm_latency(device_t root, unsigned root_cap,
+			       device_t endp, unsigned endp_cap,
+			       enum aspm_type type)
+{
+	int root_lat = 0, endp_lat = 0;
+	u32 root_lnkcap, endp_lnkcap;
+
+	root_lnkcap = pci_read_config32(root, root_cap + PCI_EXP_LNKCAP);
+	endp_lnkcap = pci_read_config32(endp, endp_cap + PCI_EXP_LNKCAP);
+
+	/* Make sure the link supports this ASPM type by checking
+	 * capability bits 11:10 with aspm_type offset by 1 */
+	if (!(root_lnkcap & (1 << (type + 9))) ||
+	    !(endp_lnkcap & (1 << (type + 9))))
+		return -1;
+
+	/* Find the one with higher latency */
+	switch (type) {
+	case PCIE_ASPM_L0S:
+		root_lat = (root_lnkcap & PCI_EXP_LNKCAP_L0SEL) >> 12;
+		endp_lat = (endp_lnkcap & PCI_EXP_LNKCAP_L0SEL) >> 12;
+		break;
+	case PCIE_ASPM_L1:
+		root_lat = (root_lnkcap & PCI_EXP_LNKCAP_L1EL) >> 15;
+		endp_lat = (endp_lnkcap & PCI_EXP_LNKCAP_L1EL) >> 15;
+		break;
+	default:
+		return -1;
+	}
+
+	return (endp_lat > root_lat) ? endp_lat : root_lat;
+}
+
+/*
+ * Enable ASPM on PCIe root port and endpoint.
+ *
+ * Returns APMC value:
+ *   -1 = Error
+ *    0 = no ASPM
+ *    1 = L0s Enabled
+ *    2 = L1 Enabled
+ *    3 = L0s and L1 Enabled
+ */
+static enum aspm_type pciexp_enable_aspm(device_t root, unsigned root_cap,
+					 device_t endp, unsigned endp_cap)
+{
+	const char *aspm_type_str[] = { "None", "L0s", "L1", "L0s and L1" };
+	enum aspm_type apmc = PCIE_ASPM_NONE;
+	int exit_latency, ok_latency;
+	u16 lnkctl;
+	u32 devcap;
+
+	/* Get endpoint device capabilities for acceptable limits */
+	devcap = pci_read_config32(endp, endp_cap + PCI_EXP_DEVCAP);
+
+	/* Enable L0s if it is within endpoint acceptable limit */
+	ok_latency = (devcap & PCI_EXP_DEVCAP_L0S) >> 6;
+	exit_latency = pciexp_aspm_latency(root, root_cap, endp, endp_cap,
+					   PCIE_ASPM_L0S);
+	if (exit_latency >= 0 && exit_latency <= ok_latency)
+		apmc |= PCIE_ASPM_L0S;
+
+	/* Enable L1 if it is within endpoint acceptable limit */
+	ok_latency = (devcap & PCI_EXP_DEVCAP_L1) >> 9;
+	exit_latency = pciexp_aspm_latency(root, root_cap, endp, endp_cap,
+					   PCIE_ASPM_L1);
+	if (exit_latency >= 0 && exit_latency <= ok_latency)
+		apmc |= PCIE_ASPM_L1;
+
+	if (apmc != PCIE_ASPM_NONE) {
+		/* Set APMC in root port first */
+		lnkctl = pci_read_config16(root, root_cap + PCI_EXP_LNKCTL);
+		lnkctl |= apmc;
+		pci_write_config16(root, root_cap + PCI_EXP_LNKCTL, lnkctl);
+
+		/* Set APMC in endpoint device next */
+		lnkctl = pci_read_config16(endp, endp_cap + PCI_EXP_LNKCTL);
+		lnkctl |= apmc;
+		pci_write_config16(endp, endp_cap + PCI_EXP_LNKCTL, lnkctl);
+	}
+
+	printk(BIOS_INFO, "ASPM: Enabled %s\n", aspm_type_str[apmc]);
+	return apmc;
+}
+#endif /* CONFIG_PCIEXP_ASPM */
+
+static void pciexp_tune_dev(device_t dev)
+{
+	device_t root = dev->bus->dev;
+	unsigned int root_cap, cap;
+
+	cap = pci_find_capability(dev, PCI_CAP_ID_PCIE);
+	if (!cap)
+		return;
+
+	root_cap = pci_find_capability(root, PCI_CAP_ID_PCIE);
+	if (!root_cap)
+		return;
+
+#if CONFIG_PCIEXP_COMMON_CLOCK
+	/* Check for and enable Common Clock */
+	pciexp_enable_common_clock(root, root_cap, dev, cap);
+#endif
+
+#if CONFIG_PCIEXP_ASPM
+	/* Check for and enable ASPM */
+	enum aspm_type apmc = pciexp_enable_aspm(root, root_cap, dev, cap);
+
+	if (apmc != PCIE_ASPM_NONE) {
+		/* Enable ASPM role based error reporting. */
+		u32 reg32 = pci_read_config32(dev, cap + PCI_EXP_DEVCAP);
+		reg32 |= PCI_EXP_DEVCAP_RBER;
+		pci_write_config32(dev, cap + PCI_EXP_DEVCAP, reg32);
+	}
+#endif
+}
+
+unsigned int pciexp_scan_bus(struct bus *bus, unsigned int min_devfn,
+			     unsigned int max_devfn, unsigned int max)
+{
+	device_t child;
+
+	max = pci_scan_bus(bus, min_devfn, max_devfn, max);
+
+	for (child = bus->children; child; child = child->sibling) {
+		if ((child->path.pci.devfn < min_devfn) ||
+		    (child->path.pci.devfn > max_devfn)) {
+			continue;
+		}
+		pciexp_tune_dev(child);
+	}
+	return max;
+}
+
+unsigned int pciexp_scan_bridge(device_t dev, unsigned int max)
+{
+	return do_pci_scan_bridge(dev, max, pciexp_scan_bus);
+}
+
+/** Default device operations for PCI Express bridges */
+static struct pci_operations pciexp_bus_ops_pci = {
+	.set_subsystem = 0,
+};
+
+struct device_operations default_pciexp_ops_bus = {
+	.read_resources   = pci_bus_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_bus_enable_resources,
+	.init             = 0,
+	.scan_bus         = pciexp_scan_bridge,
+	.enable           = 0,
+	.reset_bus        = pci_bus_reset,
+	.ops_pci          = &pciexp_bus_ops_pci,
+};