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authorChris Metcalf <cmetcalf@tilera.com>2012-05-09 12:25:02 -0400
committerChris Metcalf <cmetcalf@tilera.com>2012-07-18 16:40:24 -0400
commitd1cc1732cc62034542b042a4506d7c5043bc5e5e (patch)
tree85fe94b0e84275d791bd35ab94a6ca2cd4c7c6df /arch/tile/gxio
parent41bb38fc5398ae878c799647f3c4b25374029afb (diff)
downloadvexpress-lsk-d1cc1732cc62034542b042a4506d7c5043bc5e5e.tar.gz
arch/tile: provide kernel support for the tilegx USB shim
This change adds support for accessing the USB shim from within the kernel. Note that this change by itself does not allow the kernel to act as a host or as a device; it merely exposes the built-in on-chip hardware to the kernel. The <arch/usb_host.h> and <arch/usb_host_def.h> headers are empty at the moment because the kernel does not require any types or definitions specific to the tilegx USB shim; the generic USB core code is all we need. The headers are left in as stubs so that we don't need to modify the hypervisor header (drv_usb_host_intf.h) from upstream. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/gxio')
-rw-r--r--arch/tile/gxio/Kconfig5
-rw-r--r--arch/tile/gxio/Makefile1
-rw-r--r--arch/tile/gxio/iorpc_usb_host.c99
-rw-r--r--arch/tile/gxio/usb_host.c91
4 files changed, 196 insertions, 0 deletions
diff --git a/arch/tile/gxio/Kconfig b/arch/tile/gxio/Kconfig
index 68e1cca2cce..d221f8d6de8 100644
--- a/arch/tile/gxio/Kconfig
+++ b/arch/tile/gxio/Kconfig
@@ -21,3 +21,8 @@ config TILE_GXIO_TRIO
bool
select TILE_GXIO
select TILE_GXIO_DMA
+
+# Support direct access to the TILE-Gx USB hardware from kernel space.
+config TILE_GXIO_USB_HOST
+ bool
+ select TILE_GXIO
diff --git a/arch/tile/gxio/Makefile b/arch/tile/gxio/Makefile
index 2389ef307c7..8684bcaa74e 100644
--- a/arch/tile/gxio/Makefile
+++ b/arch/tile/gxio/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_TILE_GXIO) += iorpc_globals.o kiorpc.o
obj-$(CONFIG_TILE_GXIO_DMA) += dma_queue.o
obj-$(CONFIG_TILE_GXIO_MPIPE) += mpipe.o iorpc_mpipe.o iorpc_mpipe_info.o
obj-$(CONFIG_TILE_GXIO_TRIO) += trio.o iorpc_trio.o
+obj-$(CONFIG_TILE_GXIO_USB_HOST) += usb_host.o iorpc_usb_host.o
diff --git a/arch/tile/gxio/iorpc_usb_host.c b/arch/tile/gxio/iorpc_usb_host.c
new file mode 100644
index 00000000000..cf3c3cc1220
--- /dev/null
+++ b/arch/tile/gxio/iorpc_usb_host.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_usb_host.h"
+
+struct cfg_interrupt_param {
+ union iorpc_interrupt interrupt;
+};
+
+int gxio_usb_host_cfg_interrupt(gxio_usb_host_context_t * context, int inter_x,
+ int inter_y, int inter_ipi, int inter_event)
+{
+ struct cfg_interrupt_param temp;
+ struct cfg_interrupt_param *params = &temp;
+
+ params->interrupt.kernel.x = inter_x;
+ params->interrupt.kernel.y = inter_y;
+ params->interrupt.kernel.ipi = inter_ipi;
+ params->interrupt.kernel.event = inter_event;
+
+ return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+ sizeof(*params), GXIO_USB_HOST_OP_CFG_INTERRUPT);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_cfg_interrupt);
+
+struct register_client_memory_param {
+ HV_PTE pte;
+ unsigned int flags;
+};
+
+int gxio_usb_host_register_client_memory(gxio_usb_host_context_t * context,
+ HV_PTE pte, unsigned int flags)
+{
+ struct register_client_memory_param temp;
+ struct register_client_memory_param *params = &temp;
+
+ params->pte = pte;
+ params->flags = flags;
+
+ return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+ sizeof(*params),
+ GXIO_USB_HOST_OP_REGISTER_CLIENT_MEMORY);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_register_client_memory);
+
+struct get_mmio_base_param {
+ HV_PTE base;
+};
+
+int gxio_usb_host_get_mmio_base(gxio_usb_host_context_t * context, HV_PTE *base)
+{
+ int __result;
+ struct get_mmio_base_param temp;
+ struct get_mmio_base_param *params = &temp;
+
+ __result =
+ hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+ GXIO_USB_HOST_OP_GET_MMIO_BASE);
+ *base = params->base;
+
+ return __result;
+}
+
+EXPORT_SYMBOL(gxio_usb_host_get_mmio_base);
+
+struct check_mmio_offset_param {
+ unsigned long offset;
+ unsigned long size;
+};
+
+int gxio_usb_host_check_mmio_offset(gxio_usb_host_context_t * context,
+ unsigned long offset, unsigned long size)
+{
+ struct check_mmio_offset_param temp;
+ struct check_mmio_offset_param *params = &temp;
+
+ params->offset = offset;
+ params->size = size;
+
+ return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+ sizeof(*params),
+ GXIO_USB_HOST_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_check_mmio_offset);
diff --git a/arch/tile/gxio/usb_host.c b/arch/tile/gxio/usb_host.c
new file mode 100644
index 00000000000..66b002f54ec
--- /dev/null
+++ b/arch/tile/gxio/usb_host.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+/*
+ *
+ * Implementation of USB gxio calls.
+ */
+
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+
+#include <gxio/iorpc_globals.h>
+#include <gxio/iorpc_usb_host.h>
+#include <gxio/kiorpc.h>
+#include <gxio/usb_host.h>
+
+int gxio_usb_host_init(gxio_usb_host_context_t * context, int usb_index,
+ int is_ehci)
+{
+ char file[32];
+ int fd;
+
+ if (is_ehci)
+ snprintf(file, sizeof(file), "usb_host/%d/iorpc/ehci",
+ usb_index);
+ else
+ snprintf(file, sizeof(file), "usb_host/%d/iorpc/ohci",
+ usb_index);
+
+ fd = hv_dev_open((HV_VirtAddr) file, 0);
+ if (fd < 0) {
+ if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
+ return fd;
+ else
+ return -ENODEV;
+ }
+
+ context->fd = fd;
+
+ // Map in the MMIO space.
+ context->mmio_base =
+ (void __force *)iorpc_ioremap(fd, 0, HV_USB_HOST_MMIO_SIZE);
+
+ if (context->mmio_base == NULL) {
+ hv_dev_close(context->fd);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_init);
+
+int gxio_usb_host_destroy(gxio_usb_host_context_t * context)
+{
+ iounmap((void __force __iomem *)(context->mmio_base));
+ hv_dev_close(context->fd);
+
+ context->mmio_base = NULL;
+ context->fd = -1;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_destroy);
+
+void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t * context)
+{
+ return context->mmio_base;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_start);
+
+size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t * context)
+{
+ return HV_USB_HOST_MMIO_SIZE;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_len);