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-rw-r--r--drivers/firmware/Kconfig3
-rw-r--r--drivers/firmware/raspberrypi.c61
-rw-r--r--drivers/pci/controller/pcie-brcmstb.c37
-rw-r--r--drivers/usb/host/pci-quirks.c16
4 files changed, 112 insertions, 5 deletions
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 8007d4aa76dc..b42140cff8ac 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -178,8 +178,9 @@ config ISCSI_IBFT
Otherwise, say N.
config RASPBERRYPI_FIRMWARE
- tristate "Raspberry Pi Firmware Driver"
+ bool "Raspberry Pi Firmware Driver"
depends on BCM2835_MBOX
+ default USB_PCI
help
This option enables support for communicating with the firmware on the
Raspberry Pi.
diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
index da26a584dca0..a166ad0cec2c 100644
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -12,6 +12,8 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
@@ -19,6 +21,8 @@
#define MBOX_DATA28(msg) ((msg) & ~0xf)
#define MBOX_CHAN_PROPERTY 8
+#define VL805_PCI_CONFIG_VERSION_OFFSET 0x50
+
static struct platform_device *rpi_hwmon;
static struct platform_device *rpi_clk;
@@ -286,6 +290,63 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
}
EXPORT_SYMBOL_GPL(rpi_firmware_get);
+/*
+ * The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip that
+ * implements xHCI. After a PCI reset, VL805's firmware may either be loaded
+ * directly from an EEPROM or, if not present, by the SoC's co-processor,
+ * VideoCore. RPi4's VideoCore OS contains both the non public firmware load
+ * logic and the VL805 firmware blob. This function triggers the aforementioned
+ * process.
+ */
+int rpi_firmware_init_vl805(struct pci_dev *pdev)
+{
+ struct device_node *fw_np;
+ struct rpi_firmware *fw;
+ u32 dev_addr, version;
+ int ret;
+
+ fw_np = of_find_compatible_node(NULL, NULL,
+ "raspberrypi,bcm2835-firmware");
+ if (!fw_np)
+ return 0;
+
+ fw = rpi_firmware_get(fw_np);
+ of_node_put(fw_np);
+ if (!fw)
+ return -ENODEV;
+
+ /*
+ * Make sure we don't trigger a firmware load unnecessarily.
+ *
+ * If something went wrong with PCI, this whole exercise would be
+ * futile as VideoCore expects from us a configured PCI bus. Just take
+ * the faulty version (likely ~0) and let xHCI's registration fail
+ * further down the line.
+ */
+ pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version);
+ if (version)
+ goto exit;
+
+ dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 |
+ PCI_FUNC(pdev->devfn) << 12;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
+ &dev_addr, sizeof(dev_addr));
+ if (ret)
+ return ret;
+
+ /* Wait for vl805 to startup */
+ usleep_range(200, 1000);
+
+ pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
+ &version);
+exit:
+ pci_info(pdev, "VL805 firmware version %08x\n", version);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805);
+
static const struct of_device_id rpi_firmware_of_match[] = {
{ .compatible = "raspberrypi,bcm2835-firmware", },
{},
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 6d79d14527a6..7730ea845ff2 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -28,6 +28,8 @@
#include <linux/string.h>
#include <linux/types.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
#include "../pci.h"
/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
@@ -41,6 +43,9 @@
#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
+#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY 0x04dc
+#define PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK 0xc00
+
#define PCIE_RC_DL_MDIO_ADDR 0x1100
#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
@@ -54,11 +59,11 @@
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
#define PCIE_MEM_WIN0_LO(win) \
- PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 4)
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
#define PCIE_MEM_WIN0_HI(win) \
- PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 4)
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 8)
#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
@@ -693,10 +698,11 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
int num_out_wins = 0;
u16 nlw, cls, lnksta;
int i, ret;
- u32 tmp;
+ u32 tmp, aspm_support;
/* Reset the bridge */
brcm_pcie_bridge_sw_init_set(pcie, 1);
+ brcm_pcie_perst_set(pcie, 1);
usleep_range(100, 200);
@@ -803,6 +809,15 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
num_out_wins++;
}
+ /* Don't advertise L0s capability if 'aspm-no-l0s' */
+ aspm_support = PCIE_LINK_STATE_L1;
+ if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
+ aspm_support |= PCIE_LINK_STATE_L0S;
+ tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
+ u32p_replace_bits(&tmp, aspm_support,
+ PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
+ writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
+
/*
* For config space accesses on the RC, show the right class for
* a PCIe-PCIe bridge (the default setting is to be EP mode).
@@ -899,7 +914,6 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
brcm_msi_remove(pcie);
brcm_pcie_turn_off(pcie);
clk_disable_unprepare(pcie->clk);
- clk_put(pcie->clk);
}
static int brcm_pcie_remove(struct platform_device *pdev)
@@ -917,11 +931,26 @@ static int brcm_pcie_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node, *msi_np;
struct pci_host_bridge *bridge;
+ struct device_node *fw_np;
struct brcm_pcie *pcie;
struct pci_bus *child;
struct resource *res;
int ret;
+ /*
+ * We have to wait for Raspberry Pi's firmware interface to be up as a
+ * PCI fixup, rpi_firmware_init_vl805(), depends on it. This driver's
+ * probe can race with the firmware interface's (see
+ * drivers/firmware/raspberrypi.c) and potentially break the PCI fixup.
+ */
+ fw_np = of_find_compatible_node(NULL, NULL,
+ "raspberrypi,bcm2835-firmware");
+ if (fw_np && !rpi_firmware_get(fw_np)) {
+ of_node_put(fw_np);
+ return -EPROBE_DEFER;
+ }
+ of_node_put(fw_np);
+
bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
if (!bridge)
return -ENOMEM;
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index beb2efa71341..0dc34668bb2a 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -16,6 +16,9 @@
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
+
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
#include "pci-quirks.h"
#include "xhci-ext-caps.h"
@@ -1243,11 +1246,24 @@ iounmap:
static void quirk_usb_early_handoff(struct pci_dev *pdev)
{
+ int ret;
+
/* Skip Netlogic mips SoC's internal PCI USB controller.
* This device does not need/support EHCI/OHCI handoff
*/
if (pdev->vendor == 0x184e) /* vendor Netlogic */
return;
+
+ if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
+ ret = rpi_firmware_init_vl805(pdev);
+ if (ret) {
+ /* Firmware might be outdated, or something failed */
+ dev_warn(&pdev->dev,
+ "Failed to load VL805's firmware: %d. Will continue to attempt to work, but bad things might happen. You should fix this...\n",
+ ret);
+ }
+ }
+
if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
generated by cgit (git 2.34.1) at 2025-04-22 20:10:32 +0000