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/*
* FSI core driver
*
* Copyright (C) IBM Corporation 2016
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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. See the
* GNU General Public License for more details.
*/
#include <linux/crc4.h>
#include <linux/device.h>
#include <linux/fsi.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include "fsi-master.h"
#define CREATE_TRACE_POINTS
#include <trace/events/fsi.h>
#define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31)
#define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16)
#define FSI_SLAVE_CONF_SLOTS_SHIFT 16
#define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12)
#define FSI_SLAVE_CONF_VERSION_SHIFT 12
#define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4)
#define FSI_SLAVE_CONF_TYPE_SHIFT 4
#define FSI_SLAVE_CONF_CRC_SHIFT 4
#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0)
#define FSI_SLAVE_CONF_DATA_BITS 28
#define FSI_PEEK_BASE 0x410
static const int engine_page_size = 0x400;
#define FSI_SLAVE_BASE 0x800
/*
* FSI slave engine control register offsets
*/
#define FSI_SMODE 0x0 /* R/W: Mode register */
#define FSI_SISC 0x8 /* R/W: Interrupt condition */
#define FSI_SSTAT 0x14 /* R : Slave status */
#define FSI_LLMODE 0x100 /* R/W: Link layer mode register */
/*
* SMODE fields
*/
#define FSI_SMODE_WSC 0x80000000 /* Warm start done */
#define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */
#define FSI_SMODE_SID_SHIFT 24 /* ID shift */
#define FSI_SMODE_SID_MASK 3 /* ID Mask */
#define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */
#define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */
#define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */
#define FSI_SMODE_SD_MASK 0xf /* Send delay mask */
#define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */
#define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */
/*
* LLMODE fields
*/
#define FSI_LLMODE_ASYNC 0x1
#define FSI_SLAVE_SIZE_23b 0x800000
static DEFINE_IDA(master_ida);
struct fsi_slave {
struct device dev;
struct fsi_master *master;
int id;
int link;
uint32_t size; /* size of slave address space */
};
#define to_fsi_master(d) container_of(d, struct fsi_master, dev)
#define to_fsi_slave(d) container_of(d, struct fsi_slave, dev)
static const int slave_retries = 2;
static int discard_errors;
static int fsi_master_read(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, void *val, size_t size);
static int fsi_master_write(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, const void *val, size_t size);
static int fsi_master_break(struct fsi_master *master, int link);
/*
* fsi_device_read() / fsi_device_write() / fsi_device_peek()
*
* FSI endpoint-device support
*
* Read / write / peek accessors for a client
*
* Parameters:
* dev: Structure passed to FSI client device drivers on probe().
* addr: FSI address of given device. Client should pass in its base address
* plus desired offset to access its register space.
* val: For read/peek this is the value read at the specified address. For
* write this is value to write to the specified address.
* The data in val must be FSI bus endian (big endian).
* size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes.
* Addresses must be aligned on size boundaries or an error will result.
*/
int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val,
size_t size)
{
if (addr > dev->size || size > dev->size || addr > dev->size - size)
return -EINVAL;
return fsi_slave_read(dev->slave, dev->addr + addr, val, size);
}
EXPORT_SYMBOL_GPL(fsi_device_read);
int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val,
size_t size)
{
if (addr > dev->size || size > dev->size || addr > dev->size - size)
return -EINVAL;
return fsi_slave_write(dev->slave, dev->addr + addr, val, size);
}
EXPORT_SYMBOL_GPL(fsi_device_write);
int fsi_device_peek(struct fsi_device *dev, void *val)
{
uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t));
return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
}
static void fsi_device_release(struct device *_device)
{
struct fsi_device *device = to_fsi_dev(_device);
kfree(device);
}
static struct fsi_device *fsi_create_device(struct fsi_slave *slave)
{
struct fsi_device *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
dev->dev.parent = &slave->dev;
dev->dev.bus = &fsi_bus_type;
dev->dev.release = fsi_device_release;
return dev;
}
/* FSI slave support */
static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
uint8_t *idp)
{
uint32_t addr = *addrp;
uint8_t id = *idp;
if (addr > slave->size)
return -EINVAL;
/* For 23 bit addressing, we encode the extra two bits in the slave
* id (and the slave's actual ID needs to be 0).
*/
if (addr > 0x1fffff) {
if (slave->id != 0)
return -EINVAL;
id = (addr >> 21) & 0x3;
addr &= 0x1fffff;
}
*addrp = addr;
*idp = id;
return 0;
}
static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
{
struct fsi_master *master = slave->master;
uint32_t irq, stat;
int rc, link;
uint8_t id;
link = slave->link;
id = slave->id;
rc =
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