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uboot-tools/usb-xhci-Load-Raspberry-Pi-4-VL805-s-firmware.patch

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2020.07 RC2
2020-05-12 22:33:51 +00:00
From patchwork Tue May 5 16:26:06 2020
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To: mbrugger@suse.com, u-boot@lists.denx.de, bmeng.cn@gmail.com, marex@denx.de,
linux-kernel@vger.kernel.org
Cc: sjg@chromium.org, m.szyprowski@samsung.com, s.nawrocki@samsung.com,
mark.kettenis@xs4all.nl, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v3 1/2] arm: rpi: Add function to trigger VL805's firmware load
Date: Tue, 5 May 2020 18:26:06 +0200
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On the Raspberry Pi 4, after a PCI reset, VL805's (a xHCI chip) firmware
may either be loaded directly from an EEPROM or, if not present, by the
SoC's VideCore (the SoC's co-processor). Introduce the function that
informs VideCore that VL805 may need its firmware loaded.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
Changes since v2:
- Correct wrong function name in comment
- Add better comment on rpi_firmware_init_vl805()
Changes since v1:
- Rename function so it's not mistaken with regular firmware loading
arch/arm/mach-bcm283x/include/mach/mbox.h | 13 +++++++
arch/arm/mach-bcm283x/include/mach/msg.h | 7 ++++
arch/arm/mach-bcm283x/msg.c | 45 +++++++++++++++++++++++
3 files changed, 65 insertions(+)
diff --git a/arch/arm/mach-bcm283x/include/mach/mbox.h b/arch/arm/mach-bcm283x/include/mach/mbox.h
index 60e226ce1d..2ae2d3d97c 100644
--- a/arch/arm/mach-bcm283x/include/mach/mbox.h
+++ b/arch/arm/mach-bcm283x/include/mach/mbox.h
@@ -491,6 +491,19 @@ struct bcm2835_mbox_tag_set_palette {
} body;
};
+#define BCM2835_MBOX_TAG_NOTIFY_XHCI_RESET 0x00030058
+
+struct bcm2835_mbox_tag_pci_dev_addr {
+ struct bcm2835_mbox_tag_hdr tag_hdr;
+ union {
+ struct {
+ u32 dev_addr;
+ } req;
+ struct {
+ } resp;
+ } body;
+};
+
/*
* Pass a raw u32 message to the VC, and receive a raw u32 back.
*
diff --git a/arch/arm/mach-bcm283x/include/mach/msg.h b/arch/arm/mach-bcm283x/include/mach/msg.h
index 4afb08631b..f5213dd0e0 100644
--- a/arch/arm/mach-bcm283x/include/mach/msg.h
+++ b/arch/arm/mach-bcm283x/include/mach/msg.h
@@ -48,4 +48,11 @@ int bcm2835_set_video_params(int *widthp, int *heightp, int depth_bpp,
int pixel_order, int alpha_mode, ulong *fb_basep,
ulong *fb_sizep, int *pitchp);
+/**
+ * bcm2711_notify_vl805_reset() - get vl805's firmware loaded
+ *
+ * @return 0 if OK, -EIO on error
+ */
+int bcm2711_notify_vl805_reset(void);
+
#endif
diff --git a/arch/arm/mach-bcm283x/msg.c b/arch/arm/mach-bcm283x/msg.c
index 94b75283f8..f8ef531652 100644
--- a/arch/arm/mach-bcm283x/msg.c
+++ b/arch/arm/mach-bcm283x/msg.c
@@ -40,6 +40,12 @@ struct msg_setup {
u32 end_tag;
};
+struct msg_notify_vl805_reset {
+ struct bcm2835_mbox_hdr hdr;
+ struct bcm2835_mbox_tag_pci_dev_addr dev_addr;
+ u32 end_tag;
+};
+
int bcm2835_power_on_module(u32 module)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
@@ -151,3 +157,42 @@ int bcm2835_set_video_params(int *widthp, int *heightp, int depth_bpp,
return 0;
}
+
+/*
+ * 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 bcm2711_notify_vl805_reset(void)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(struct msg_notify_vl805_reset,
+ msg_notify_vl805_reset, 1);
+ int ret;
+
+ BCM2835_MBOX_INIT_HDR(msg_notify_vl805_reset);
+ BCM2835_MBOX_INIT_TAG(&msg_notify_vl805_reset->dev_addr,
+ NOTIFY_XHCI_RESET);
+
+ /*
+ * The pci device address is expected like this:
+ *
+ * PCI_BUS << 20 | PCI_SLOT << 15 | PCI_FUNC << 12
+ *
+ * But since RPi4's PCIe setup is hardwired, we know the address in
+ * advance.
+ */
+ msg_notify_vl805_reset->dev_addr.body.req.dev_addr = 0x100000;
+
+ ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
+ &msg_notify_vl805_reset->hdr);
+ if (ret) {
+ printf("bcm2711: Faild to load vl805's firmware, %d\n", ret);
+ return -EIO;
+ }
+
+ return 0;
+}
+
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Cc: sjg@chromium.org, m.szyprowski@samsung.com, s.nawrocki@samsung.com,
mark.kettenis@xs4all.nl, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v3 2/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware
Date: Tue, 5 May 2020 18:26:07 +0200
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When needed, RPi4's co-processor (called VideoCore) has to be instructed
to load VL805's firmware (the chip providing xHCI support). VideCore's
firmware expects the board's PCIe bus to be already configured in order
for it to load the xHCI chip firmware. So we have to make sure this
happens in between the PCIe configuration and xHCI startup.
Introduce a callback in xhci_pci_probe() to run this platform specific
routine.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
Changes since v2:
- Get rid of #ifdef CONFIG_BCM2711
- Get rid of redundant error message
Changes since v1:
- Create callback
board/raspberrypi/rpi/rpi.c | 6 ++++++
drivers/usb/host/xhci-pci.c | 6 ++++++
include/usb/xhci.h | 3 +++
3 files changed, 15 insertions(+)
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index e367ba3092..dcaf45fbf2 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -14,6 +14,7 @@
#include <lcd.h>
#include <memalign.h>
#include <mmc.h>
+#include <usb/xhci.h>
#include <asm/gpio.h>
#include <asm/arch/mbox.h>
#include <asm/arch/msg.h>
@@ -494,3 +495,8 @@ int ft_board_setup(void *blob, bd_t *bd)
return 0;
}
+
+void xhci_pci_fixup(struct udevice *dev)
+{
+ bcm2711_notify_vl805_reset();
+}
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index c1f60da541..1285dde1ef 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -11,6 +11,10 @@
#include <usb.h>
#include <usb/xhci.h>
+__weak void xhci_pci_fixup(struct udevice *dev)
+{
+}
+
static void xhci_pci_init(struct udevice *dev, struct xhci_hccr **ret_hccr,
struct xhci_hcor **ret_hcor)
{
@@ -40,6 +44,8 @@ static int xhci_pci_probe(struct udevice *dev)
struct xhci_hccr *hccr;
struct xhci_hcor *hcor;
+ xhci_pci_fixup(dev);
+
xhci_pci_init(dev, &hccr, &hcor);
return xhci_register(dev, hccr, hcor);
diff --git a/include/usb/xhci.h b/include/usb/xhci.h
index c16106a2fc..57feed7603 100644
--- a/include/usb/xhci.h
+++ b/include/usb/xhci.h
@@ -16,6 +16,7 @@
#ifndef HOST_XHCI_H_
#define HOST_XHCI_H_
+#include <usb.h>
#include <asm/types.h>
#include <asm/cache.h>
#include <asm/io.h>
@@ -1281,4 +1282,6 @@ extern struct dm_usb_ops xhci_usb_ops;
struct xhci_ctrl *xhci_get_ctrl(struct usb_device *udev);
+extern void xhci_pci_fixup(struct udevice *dev);
+
#endif /* HOST_XHCI_H_ */
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