greybus: es2: add ES2 Greybus Host driver
This is just a copy of ES1 for now, things will start to diverge soon. Any common functionality will be factored out over time. Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>hifive-unleashed-5.1
Greg Kroah-Hartman
parent
2ec515bfff
commit
f587027e79
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@ -22,6 +22,7 @@ obj-m += gb-phy.o
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obj-m += gb-vibrator.o
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obj-m += gb-battery.o
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obj-m += gb-es1.o
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obj-m += gb-es2.o
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KERNELVER ?= $(shell uname -r)
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KERNELDIR ?= /lib/modules/$(KERNELVER)/build
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@ -0,0 +1,618 @@
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/*
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* Greybus "AP" USB driver for "ES2" controller chips
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*
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* Copyright 2014 Google Inc.
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* Copyright 2014 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/sizes.h>
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#include <linux/usb.h>
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#include "greybus.h"
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#include "svc_msg.h"
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#include "kernel_ver.h"
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/*
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* Macros for making pointers explicitly opaque, such that the result
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* isn't valid but also can't be mistaken for an ERR_PTR() value.
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*/
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#define conceal_urb(urb) ((void *)((uintptr_t)(urb) ^ 0xbad))
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#define reveal_urb(cookie) ((void *)((uintptr_t)(cookie) ^ 0xbad))
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/* Memory sizes for the buffers sent to/from the ES1 controller */
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#define ES1_SVC_MSG_SIZE (sizeof(struct svc_msg) + SZ_64K)
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#define ES1_GBUF_MSG_SIZE_MAX PAGE_SIZE
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static const struct usb_device_id id_table[] = {
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/* Made up numbers for the SVC USB Bridge in ES1 */
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{ USB_DEVICE(0xffff, 0x0001) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/*
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* Number of CPort IN urbs in flight at any point in time.
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* Adjust if we are having stalls in the USB buffer due to not enough urbs in
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* flight.
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*/
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#define NUM_CPORT_IN_URB 4
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/* Number of CPort OUT urbs in flight at any point in time.
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* Adjust if we get messages saying we are out of urbs in the system log.
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*/
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#define NUM_CPORT_OUT_URB 8
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/**
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* es1_ap_dev - ES1 USB Bridge to AP structure
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* @usb_dev: pointer to the USB device we are.
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* @usb_intf: pointer to the USB interface we are bound to.
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* @hd: pointer to our greybus_host_device structure
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* @control_endpoint: endpoint to send data to SVC
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* @svc_endpoint: endpoint for SVC data in
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* @cport_in_endpoint: bulk in endpoint for CPort data
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* @cport-out_endpoint: bulk out endpoint for CPort data
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* @svc_buffer: buffer for SVC messages coming in on @svc_endpoint
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* @svc_urb: urb for SVC messages coming in on @svc_endpoint
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* @cport_in_urb: array of urbs for the CPort in messages
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* @cport_in_buffer: array of buffers for the @cport_in_urb urbs
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* @cport_out_urb: array of urbs for the CPort out messages
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* @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
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* not.
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* @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
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*/
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struct es1_ap_dev {
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struct usb_device *usb_dev;
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struct usb_interface *usb_intf;
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struct greybus_host_device *hd;
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__u8 control_endpoint;
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__u8 svc_endpoint;
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__u8 cport_in_endpoint;
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__u8 cport_out_endpoint;
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u8 *svc_buffer;
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struct urb *svc_urb;
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struct urb *cport_in_urb[NUM_CPORT_IN_URB];
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u8 *cport_in_buffer[NUM_CPORT_IN_URB];
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struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
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bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
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spinlock_t cport_out_urb_lock;
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};
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static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd)
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{
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return (struct es1_ap_dev *)&hd->hd_priv;
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}
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static void cport_out_callback(struct urb *urb);
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/*
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* Buffer constraints for the host driver.
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*
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* A "buffer" is used to hold data to be transferred for Greybus by
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* the host driver. A buffer is represented by a "buffer pointer",
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* which defines a region of memory used by the host driver for
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* transferring the data. When Greybus allocates a buffer, it must
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* do so subject to the constraints associated with the host driver.
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* These constraints are specified by two parameters: the
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* headroom; and the maximum buffer size.
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*
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* +------------------+
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* | Host driver | \
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* | reserved area | }- headroom
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* | . . . | /
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* buffer pointer ---> +------------------+
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* | Buffer space for | \
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* | transferred data | }- buffer size
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* | . . . | / (limited to size_max)
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* +------------------+
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*
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* headroom: Every buffer must have at least this much space
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* *before* the buffer pointer, reserved for use by the
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* host driver. I.e., ((char *)buffer - headroom) must
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* point to valid memory, usable only by the host driver.
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* size_max: The maximum size of a buffer (not including the
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* headroom) must not exceed this.
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*/
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static void hd_buffer_constraints(struct greybus_host_device *hd)
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{
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/*
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* Only one byte is required, but this produces a result
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* that's better aligned for the user.
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*/
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hd->buffer_headroom = sizeof(u32); /* For cport id */
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hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX;
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BUILD_BUG_ON(hd->buffer_headroom > GB_BUFFER_HEADROOM_MAX);
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}
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#define ES1_TIMEOUT 500 /* 500 ms for the SVC to do something */
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static int submit_svc(struct svc_msg *svc_msg, struct greybus_host_device *hd)
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{
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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int retval;
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/* SVC messages go down our control pipe */
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retval = usb_control_msg(es1->usb_dev,
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usb_sndctrlpipe(es1->usb_dev,
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es1->control_endpoint),
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0x01, /* vendor request AP message */
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
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0x00, 0x00,
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(char *)svc_msg,
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sizeof(*svc_msg),
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ES1_TIMEOUT);
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if (retval != sizeof(*svc_msg))
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return retval;
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return 0;
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}
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static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask)
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{
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struct urb *urb = NULL;
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unsigned long flags;
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int i;
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spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
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/* Look in our pool of allocated urbs first, as that's the "fastest" */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (es1->cport_out_urb_busy[i] == false) {
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es1->cport_out_urb_busy[i] = true;
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urb = es1->cport_out_urb[i];
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break;
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}
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}
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spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
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if (urb)
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return urb;
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/*
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* Crap, pool is empty, complain to the syslog and go allocate one
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* dynamically as we have to succeed.
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*/
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dev_err(&es1->usb_dev->dev,
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"No free CPort OUT urbs, having to dynamically allocate one!\n");
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return usb_alloc_urb(0, gfp_mask);
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}
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static void free_urb(struct es1_ap_dev *es1, struct urb *urb)
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{
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unsigned long flags;
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int i;
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/*
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* See if this was an urb in our pool, if so mark it "free", otherwise
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* we need to free it ourselves.
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*/
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spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (urb == es1->cport_out_urb[i]) {
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es1->cport_out_urb_busy[i] = false;
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urb = NULL;
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break;
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}
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}
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spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
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/* If urb is not NULL, then we need to free this urb */
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usb_free_urb(urb);
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}
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/*
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* Returns an opaque cookie value if successful, or a pointer coded
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* error otherwise. If the caller wishes to cancel the in-flight
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* buffer, it must supply the returned cookie to the cancel routine.
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*/
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static void *buffer_send(struct greybus_host_device *hd, u16 cport_id,
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void *buffer, size_t buffer_size, gfp_t gfp_mask)
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{
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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struct usb_device *udev = es1->usb_dev;
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u8 *transfer_buffer = buffer;
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int transfer_buffer_size;
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int retval;
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struct urb *urb;
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if (!buffer) {
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pr_err("null buffer supplied to send\n");
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return ERR_PTR(-EINVAL);
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}
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if (buffer_size > (size_t)INT_MAX) {
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pr_err("bad buffer size (%zu) supplied to send\n", buffer_size);
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return ERR_PTR(-EINVAL);
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}
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transfer_buffer--;
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transfer_buffer_size = buffer_size + 1;
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/*
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* The data actually transferred will include an indication
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* of where the data should be sent. Do one last check of
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* the target CPort id before filling it in.
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*/
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if (cport_id == CPORT_ID_BAD) {
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pr_err("request to send inbound data buffer\n");
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return ERR_PTR(-EINVAL);
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}
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if (cport_id > (u16)U8_MAX) {
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pr_err("cport_id (%hd) is out of range for ES1\n", cport_id);
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return ERR_PTR(-EINVAL);
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}
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/* OK, the destination is fine; record it in the transfer buffer */
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*transfer_buffer = cport_id;
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/* Find a free urb */
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urb = next_free_urb(es1, gfp_mask);
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if (!urb)
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return ERR_PTR(-ENOMEM);
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usb_fill_bulk_urb(urb, udev,
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usb_sndbulkpipe(udev, es1->cport_out_endpoint),
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transfer_buffer, transfer_buffer_size,
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cport_out_callback, hd);
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retval = usb_submit_urb(urb, gfp_mask);
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if (retval) {
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pr_err("error %d submitting URB\n", retval);
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free_urb(es1, urb);
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return ERR_PTR(retval);
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}
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return conceal_urb(urb);
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}
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/*
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* The cookie value supplied is the value that buffer_send()
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* returned to its caller. It identifies the buffer that should be
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* canceled. This function must also handle (which is to say,
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* ignore) a null cookie value.
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*/
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static void buffer_cancel(void *cookie)
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{
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/*
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* We really should be defensive and track all outstanding
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* (sent) buffers rather than trusting the cookie provided
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* is valid. For the time being, this will do.
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*/
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if (cookie)
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usb_kill_urb(reveal_urb(cookie));
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}
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static struct greybus_host_driver es1_driver = {
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.hd_priv_size = sizeof(struct es1_ap_dev),
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.buffer_send = buffer_send,
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.buffer_cancel = buffer_cancel,
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.submit_svc = submit_svc,
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};
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/* Common function to report consistent warnings based on URB status */
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static int check_urb_status(struct urb *urb)
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{
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struct device *dev = &urb->dev->dev;
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int status = urb->status;
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switch (status) {
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case 0:
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return 0;
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case -EOVERFLOW:
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dev_err(dev, "%s: overflow actual length is %d\n",
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__func__, urb->actual_length);
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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case -EILSEQ:
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case -EPROTO:
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/* device is gone, stop sending */
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return status;
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}
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dev_err(dev, "%s: unknown status %d\n", __func__, status);
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return -EAGAIN;
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}
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static void ap_disconnect(struct usb_interface *interface)
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{
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struct es1_ap_dev *es1;
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struct usb_device *udev;
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int i;
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es1 = usb_get_intfdata(interface);
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if (!es1)
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return;
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/* Tear down everything! */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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struct urb *urb = es1->cport_out_urb[i];
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if (!urb)
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break;
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usb_kill_urb(urb);
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usb_free_urb(urb);
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es1->cport_out_urb[i] = NULL;
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es1->cport_out_urb_busy[i] = false; /* just to be anal */
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}
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for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
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struct urb *urb = es1->cport_in_urb[i];
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if (!urb)
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break;
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usb_kill_urb(urb);
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usb_free_urb(urb);
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kfree(es1->cport_in_buffer[i]);
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es1->cport_in_buffer[i] = NULL;
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}
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usb_kill_urb(es1->svc_urb);
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usb_free_urb(es1->svc_urb);
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es1->svc_urb = NULL;
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kfree(es1->svc_buffer);
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es1->svc_buffer = NULL;
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usb_set_intfdata(interface, NULL);
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udev = es1->usb_dev;
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greybus_remove_hd(es1->hd);
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usb_put_dev(udev);
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}
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/* Callback for when we get a SVC message */
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static void svc_in_callback(struct urb *urb)
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{
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struct greybus_host_device *hd = urb->context;
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struct device *dev = &urb->dev->dev;
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int status = check_urb_status(urb);
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int retval;
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if (status) {
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if ((status == -EAGAIN) || (status == -EPROTO))
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goto exit;
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dev_err(dev, "urb svc in error %d (dropped)\n", status);
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return;
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}
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/* We have a message, create a new message structure, add it to the
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* list, and wake up our thread that will process the messages.
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*/
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greybus_svc_in(hd, urb->transfer_buffer, urb->actual_length);
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exit:
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/* resubmit the urb to get more messages */
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(dev, "Can not submit urb for AP data: %d\n", retval);
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}
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static void cport_in_callback(struct urb *urb)
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{
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struct greybus_host_device *hd = urb->context;
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struct device *dev = &urb->dev->dev;
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int status = check_urb_status(urb);
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int retval;
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u16 cport_id;
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u8 *data;
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if (status) {
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if ((status == -EAGAIN) || (status == -EPROTO))
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goto exit;
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dev_err(dev, "urb cport in error %d (dropped)\n", status);
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return;
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}
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/* The size has to be at least one, for the cport id */
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if (!urb->actual_length) {
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dev_err(dev, "%s: no cport id in input buffer?\n", __func__);
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goto exit;
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}
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/*
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* Our CPort number is the first byte of the data stream,
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* the rest of the stream is "real" data
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*/
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data = urb->transfer_buffer;
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cport_id = (u16)data[0];
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data = &data[1];
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/* Pass this data to the greybus core */
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greybus_data_rcvd(hd, cport_id, data, urb->actual_length - 1);
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exit:
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/* put our urb back in the request pool */
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(dev, "%s: error %d in submitting urb.\n",
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__func__, retval);
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}
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static void cport_out_callback(struct urb *urb)
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{
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struct greybus_host_device *hd = urb->context;
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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int status = check_urb_status(urb);
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u8 *data = urb->transfer_buffer + 1;
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/*
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* Tell the submitter that the buffer send (attempt) is
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* complete, and report the status. The submitter's buffer
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* starts after the one-byte CPort id we inserted.
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*/
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data = urb->transfer_buffer + 1;
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greybus_data_sent(hd, data, status);
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free_urb(es1, urb);
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/*
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* Rest assured Greg, this craziness is getting fixed.
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*
|
||||
* Yes, you are right, we aren't telling anyone that the urb finished.
|
||||
* "That's crazy! How does this all even work?" you might be saying.
|
||||
* The "magic" is the idea that greybus works on the "operation" level,
|
||||
* not the "send a buffer" level. All operations are "round-trip" with
|
||||
* a response from the device that the operation finished, or it will
|
||||
* time out. Because of that, we don't care that this urb finished, or
|
||||
* failed, or did anything else, as higher levels of the protocol stack
|
||||
* will handle completions and timeouts and the rest.
|
||||
*
|
||||
* This protocol is "needed" due to some hardware restrictions on the
|
||||
* current generation of Unipro controllers. Think about it for a
|
||||
* minute, this is a USB driver, talking to a Unipro bridge, impedance
|
||||
* mismatch is huge, yet the Unipro controller are even more
|
||||
* underpowered than this little USB controller. We rely on the round
|
||||
* trip to keep stalls in the Unipro controllers from happening so that
|
||||
* we can keep data flowing properly, no matter how slow it might be.
|
||||
*
|
||||
* Once again, a wonderful bus protocol cut down in its prime by a naive
|
||||
* controller chip. We dream of the day we have a "real" HCD for
|
||||
* Unipro. Until then, we suck it up and make the hardware work, as
|
||||
* that's the job of the firmware and kernel.
|
||||
* </rant>
|
||||
*/
|
||||
}
|
||||
|
||||
/*
|
||||
* The ES1 USB Bridge device contains 4 endpoints
|
||||
* 1 Control - usual USB stuff + AP -> SVC messages
|
||||
* 1 Interrupt IN - SVC -> AP messages
|
||||
* 1 Bulk IN - CPort data in
|
||||
* 1 Bulk OUT - CPort data out
|
||||
*/
|
||||
static int ap_probe(struct usb_interface *interface,
|
||||
const struct usb_device_id *id)
|
||||
{
|
||||
struct es1_ap_dev *es1;
|
||||
struct greybus_host_device *hd;
|
||||
struct usb_device *udev;
|
||||
struct usb_host_interface *iface_desc;
|
||||
struct usb_endpoint_descriptor *endpoint;
|
||||
bool int_in_found = false;
|
||||
bool bulk_in_found = false;
|
||||
bool bulk_out_found = false;
|
||||
int retval = -ENOMEM;
|
||||
int i;
|
||||
u8 svc_interval = 0;
|
||||
|
||||
udev = usb_get_dev(interface_to_usbdev(interface));
|
||||
|
||||
hd = greybus_create_hd(&es1_driver, &udev->dev);
|
||||
if (!hd) {
|
||||
usb_put_dev(udev);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Fill in the buffer allocation constraints */
|
||||
hd_buffer_constraints(hd);
|
||||
|
||||
es1 = hd_to_es1(hd);
|
||||
es1->hd = hd;
|
||||
es1->usb_intf = interface;
|
||||
es1->usb_dev = udev;
|
||||
spin_lock_init(&es1->cport_out_urb_lock);
|
||||
usb_set_intfdata(interface, es1);
|
||||
|
||||
/* Control endpoint is the pipe to talk to this AP, so save it off */
|
||||
endpoint = &udev->ep0.desc;
|
||||
es1->control_endpoint = endpoint->bEndpointAddress;
|
||||
|
||||
/* find all 3 of our endpoints */
|
||||
iface_desc = interface->cur_altsetting;
|
||||
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
||||
endpoint = &iface_desc->endpoint[i].desc;
|
||||
|
||||
if (usb_endpoint_is_int_in(endpoint)) {
|
||||
es1->svc_endpoint = endpoint->bEndpointAddress;
|
||||
svc_interval = endpoint->bInterval;
|
||||
int_in_found = true;
|
||||
} else if (usb_endpoint_is_bulk_in(endpoint)) {
|
||||
es1->cport_in_endpoint = endpoint->bEndpointAddress;
|
||||
bulk_in_found = true;
|
||||
} else if (usb_endpoint_is_bulk_out(endpoint)) {
|
||||
es1->cport_out_endpoint = endpoint->bEndpointAddress;
|
||||
bulk_out_found = true;
|
||||
} else {
|
||||
dev_err(&udev->dev,
|
||||
"Unknown endpoint type found, address %x\n",
|
||||
endpoint->bEndpointAddress);
|
||||
}
|
||||
}
|
||||
if ((int_in_found == false) ||
|
||||
(bulk_in_found == false) ||
|
||||
(bulk_out_found == false)) {
|
||||
dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Create our buffer and URB to get SVC messages, and start it up */
|
||||
es1->svc_buffer = kmalloc(ES1_SVC_MSG_SIZE, GFP_KERNEL);
|
||||
if (!es1->svc_buffer)
|
||||
goto error;
|
||||
|
||||
es1->svc_urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!es1->svc_urb)
|
||||
goto error;
|
||||
|
||||
usb_fill_int_urb(es1->svc_urb, udev,
|
||||
usb_rcvintpipe(udev, es1->svc_endpoint),
|
||||
es1->svc_buffer, ES1_SVC_MSG_SIZE, svc_in_callback,
|
||||
hd, svc_interval);
|
||||
retval = usb_submit_urb(es1->svc_urb, GFP_KERNEL);
|
||||
if (retval)
|
||||
goto error;
|
||||
|
||||
/* Allocate buffers for our cport in messages and start them up */
|
||||
for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
|
||||
struct urb *urb;
|
||||
u8 *buffer;
|
||||
|
||||
urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!urb)
|
||||
goto error;
|
||||
buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
goto error;
|
||||
|
||||
usb_fill_bulk_urb(urb, udev,
|
||||
usb_rcvbulkpipe(udev, es1->cport_in_endpoint),
|
||||
buffer, ES1_GBUF_MSG_SIZE_MAX,
|
||||
cport_in_callback, hd);
|
||||
es1->cport_in_urb[i] = urb;
|
||||
es1->cport_in_buffer[i] = buffer;
|
||||
retval = usb_submit_urb(urb, GFP_KERNEL);
|
||||
if (retval)
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Allocate urbs for our CPort OUT messages */
|
||||
for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
|
||||
struct urb *urb;
|
||||
|
||||
urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!urb)
|
||||
goto error;
|
||||
|
||||
es1->cport_out_urb[i] = urb;
|
||||
es1->cport_out_urb_busy[i] = false; /* just to be anal */
|
||||
}
|
||||
|
||||
return 0;
|
||||
error:
|
||||
ap_disconnect(interface);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static struct usb_driver es1_ap_driver = {
|
||||
.name = "es1_ap_driver",
|
||||
.probe = ap_probe,
|
||||
.disconnect = ap_disconnect,
|
||||
.id_table = id_table,
|
||||
};
|
||||
|
||||
module_usb_driver(es1_ap_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
|
||||
Loading…
Reference in New Issue