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// PRU input/output via RPMsg
//
// Copyright (C) 2017 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint32_t
#include <string.h> // memcpy
#include <pru/io.h> // read_r31
#include <pru_intc.h> // CT_INTC
#include <pru_rpmsg.h> // pru_rpmsg_send
#include <pru_virtio_ids.h> // VIRTIO_ID_RPMSG
#include "board/misc.h" // console_get_input
#include "internal.h" // WAKE_ARM_EVENT
#include "sched.h" // DECL_INIT
#define CHAN_NAME "rpmsg-pru"
#define CHAN_DESC "Channel 30"
#define CHAN_PORT 30
/****************************************************************
* Console interface
****************************************************************/
static void
clear_pending(void)
{
CT_INTC.SECR0 = 1 << GOT_ARM_EVENT;
}
static struct pru_rpmsg_transport transport;
static uint16_t transport_dst;
static char input_data[64];
// XXX
struct pru_rpmsg_hdr {
uint32_t src;
uint32_t dst;
uint32_t reserved;
uint16_t len;
uint16_t flags;
uint8_t data[0];
};
// Return a buffer (and length) containing any incoming messages
char *
console_get_input(uint8_t *plen)
{
if (!(read_r31() & (1 << (GOT_ARM_IRQ + R31_IRQ_OFFSET))))
goto nodata;
struct pru_rpmsg_hdr *msg;
uint32_t msg_len;
int16_t head = pru_virtqueue_get_avail_buf(
&transport.virtqueue1, (void**)&msg, &msg_len);
if (head < 0) {
clear_pending();
goto nodata;
}
transport_dst = msg->src;
int len = msg->len < sizeof(input_data) ? msg->len : sizeof(input_data);
memcpy(input_data, msg->data, len);
pru_virtqueue_add_used_buf(&transport.virtqueue1, head, msg_len);
pru_virtqueue_kick(&transport.virtqueue1);
*plen = len;
return input_data;
nodata:
*plen = 0;
return input_data;
}
// Remove from the receive buffer the given number of bytes
void
console_pop_input(uint8_t len)
{
}
static char output_data[64];
// Return an output buffer that the caller may fill with transmit messages
char *
console_get_output(uint8_t len)
{
if (len > sizeof(output_data))
return NULL;
return output_data;
}
// Accept the given number of bytes added to the transmit buffer
void
console_push_output(uint8_t len)
{
pru_rpmsg_send(&transport, CHAN_PORT, transport_dst, output_data, len);
}
/****************************************************************
* resource table
****************************************************************/
/*
* Sizes of the virtqueues (expressed in number of buffers supported,
* and must be power of 2)
*/
#define PRU_RPMSG_VQ0_SIZE 16
#define PRU_RPMSG_VQ1_SIZE 16
/*
* The feature bitmap for virtio rpmsg
*/
#define VIRTIO_RPMSG_F_NS 0 //name service notifications
/* This firmware supports name service notifications as one of its features */
#define RPMSG_PRU_C0_FEATURES (1 << VIRTIO_RPMSG_F_NS)
/* Definition for unused interrupts */
#define HOST_UNUSED 255
/* Mapping sysevts to a channel. Each pair contains a sysevt, channel. */
static struct ch_map pru_intc_map[] = {
{IEP_EVENT, IEP_IRQ},
{WAKE_ARM_EVENT, WAKE_ARM_IRQ},
{GOT_ARM_EVENT, GOT_ARM_IRQ},
};
struct my_resource_table {
struct resource_table base;
uint32_t offset[2]; /* Should match 'num' in actual definition */
/* rpmsg vdev entry */
struct fw_rsc_vdev rpmsg_vdev;
struct fw_rsc_vdev_vring rpmsg_vring0;
struct fw_rsc_vdev_vring rpmsg_vring1;
/* intc definition */
struct fw_rsc_custom pru_ints;
} resourceTable __section(".resource_table") = {
{
1, /* Resource table version: only version 1 is
* supported by the current driver */
2, /* number of entries in the table */
{ 0, 0 }, /* reserved, must be zero */
},
/* offsets to entries */
{
offsetof(struct my_resource_table, rpmsg_vdev),
offsetof(struct my_resource_table, pru_ints),
},
/* rpmsg vdev entry */
{
(uint32_t)TYPE_VDEV, //type
(uint32_t)VIRTIO_ID_RPMSG, //id
(uint32_t)0, //notifyid
(uint32_t)RPMSG_PRU_C0_FEATURES, //dfeatures
(uint32_t)0, //gfeatures
(uint32_t)0, //config_len
(uint8_t)0, //status
(uint8_t)2, //num_of_vrings, only two is supported
{(uint8_t)0, (uint8_t)0 }, //reserved
/* no config data */
},
/* the two vrings */
{
0, //da, will be populated by host, can't pass it in
16, //align (bytes),
PRU_RPMSG_VQ0_SIZE, //num of descriptors
0, //notifyid, will be populated, can't pass right now
0 //reserved
},
{
0, //da, will be populated by host, can't pass it in
16, //align (bytes),
PRU_RPMSG_VQ1_SIZE, //num of descriptors
0, //notifyid, will be populated, can't pass right now
0 //reserved
},
{
TYPE_CUSTOM, TYPE_PRU_INTS,
sizeof(struct fw_rsc_custom_ints),
{ /* PRU_INTS version */
{
0x0000,
/* Channel-to-host mapping, 255 for unused */
{
IEP_IRQ, GOT_ARM_IRQ, WAKE_ARM_IRQ,
HOST_UNUSED, HOST_UNUSED, HOST_UNUSED,
HOST_UNUSED, HOST_UNUSED, HOST_UNUSED, HOST_UNUSED
},
/* Number of evts being mapped to channels */
(sizeof(pru_intc_map) / sizeof(struct ch_map)),
/* Pointer to the structure containing mapped events */
pru_intc_map,
},
},
},
};
/****************************************************************
* RPMsg init
****************************************************************/
#define VIRTIO_CONFIG_S_DRIVER_OK 4
void
console_init(void)
{
clear_pending();
/* Make sure the Linux drivers are ready for RPMsg communication */
volatile uint8_t *status = &resourceTable.rpmsg_vdev.status;
while (!(*status & VIRTIO_CONFIG_S_DRIVER_OK))
;
/* Initialize the RPMsg transport structure */
pru_rpmsg_init(&transport,
&resourceTable.rpmsg_vring0,
&resourceTable.rpmsg_vring1,
WAKE_ARM_EVENT,
GOT_ARM_EVENT);
/* Create the RPMsg channel between the PRU and ARM user space
* using the transport structure. */
while (pru_rpmsg_channel(RPMSG_NS_CREATE, &transport, CHAN_NAME
, CHAN_DESC, CHAN_PORT) != PRU_RPMSG_SUCCESS)
;
}
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