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![Colin Ian King](/assets/img/avatar_default.png)
Currently the cfam_read and cfam_write functions return the provided
number of bytes given in the count parameter and not the error return
code in variable rc, hence all failures of read/writes are being
silently ignored. Fix this by returning the error code in rc.
Addresses-Coverity: ("Unused value")
Fixes: d1dcd67825
("fsi: Add cfam char devices")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jeremy Kerr <jk@ozlabs.org>
Link: https://lore.kernel.org/r/20210603122812.83587-1-colin.king@canonical.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
1426 lines
33 KiB
C
1426 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* FSI core driver
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*
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* Copyright (C) IBM Corporation 2016
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*
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* TODO:
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* - Rework topology
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* - s/chip_id/chip_loc
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* - s/cfam/chip (cfam_id -> chip_id etc...)
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*/
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#include <linux/crc4.h>
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#include <linux/device.h>
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#include <linux/fsi.h>
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#include <linux/idr.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include "fsi-master.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/fsi.h>
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#define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31)
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#define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16)
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#define FSI_SLAVE_CONF_SLOTS_SHIFT 16
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#define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12)
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#define FSI_SLAVE_CONF_VERSION_SHIFT 12
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#define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4)
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#define FSI_SLAVE_CONF_TYPE_SHIFT 4
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#define FSI_SLAVE_CONF_CRC_SHIFT 4
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#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0)
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#define FSI_SLAVE_CONF_DATA_BITS 28
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#define FSI_PEEK_BASE 0x410
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static const int engine_page_size = 0x400;
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#define FSI_SLAVE_BASE 0x800
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/*
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* FSI slave engine control register offsets
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*/
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#define FSI_SMODE 0x0 /* R/W: Mode register */
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#define FSI_SISC 0x8 /* R/W: Interrupt condition */
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#define FSI_SSTAT 0x14 /* R : Slave status */
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#define FSI_SLBUS 0x30 /* W : LBUS Ownership */
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#define FSI_LLMODE 0x100 /* R/W: Link layer mode register */
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/*
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* SMODE fields
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*/
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#define FSI_SMODE_WSC 0x80000000 /* Warm start done */
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#define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */
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#define FSI_SMODE_SID_SHIFT 24 /* ID shift */
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#define FSI_SMODE_SID_MASK 3 /* ID Mask */
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#define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */
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#define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */
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#define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */
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#define FSI_SMODE_SD_MASK 0xf /* Send delay mask */
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#define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */
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#define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */
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/*
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* SLBUS fields
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*/
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#define FSI_SLBUS_FORCE 0x80000000 /* Force LBUS ownership */
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/*
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* LLMODE fields
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*/
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#define FSI_LLMODE_ASYNC 0x1
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#define FSI_SLAVE_SIZE_23b 0x800000
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static DEFINE_IDA(master_ida);
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struct fsi_slave {
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struct device dev;
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struct fsi_master *master;
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struct cdev cdev;
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int cdev_idx;
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int id; /* FSI address */
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int link; /* FSI link# */
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u32 cfam_id;
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int chip_id;
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uint32_t size; /* size of slave address space */
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u8 t_send_delay;
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u8 t_echo_delay;
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};
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#define to_fsi_master(d) container_of(d, struct fsi_master, dev)
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#define to_fsi_slave(d) container_of(d, struct fsi_slave, dev)
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static const int slave_retries = 2;
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static int discard_errors;
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static dev_t fsi_base_dev;
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static DEFINE_IDA(fsi_minor_ida);
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#define FSI_CHAR_MAX_DEVICES 0x1000
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/* Legacy /dev numbering: 4 devices per chip, 16 chips */
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#define FSI_CHAR_LEGACY_TOP 64
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static int fsi_master_read(struct fsi_master *master, int link,
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uint8_t slave_id, uint32_t addr, void *val, size_t size);
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static int fsi_master_write(struct fsi_master *master, int link,
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uint8_t slave_id, uint32_t addr, const void *val, size_t size);
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static int fsi_master_break(struct fsi_master *master, int link);
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/*
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* fsi_device_read() / fsi_device_write() / fsi_device_peek()
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*
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* FSI endpoint-device support
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*
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* Read / write / peek accessors for a client
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*
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* Parameters:
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* dev: Structure passed to FSI client device drivers on probe().
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* addr: FSI address of given device. Client should pass in its base address
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* plus desired offset to access its register space.
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* val: For read/peek this is the value read at the specified address. For
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* write this is value to write to the specified address.
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* The data in val must be FSI bus endian (big endian).
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* size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes.
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* Addresses must be aligned on size boundaries or an error will result.
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*/
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int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val,
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size_t size)
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{
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if (addr > dev->size || size > dev->size || addr > dev->size - size)
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return -EINVAL;
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return fsi_slave_read(dev->slave, dev->addr + addr, val, size);
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}
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EXPORT_SYMBOL_GPL(fsi_device_read);
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int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val,
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size_t size)
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{
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if (addr > dev->size || size > dev->size || addr > dev->size - size)
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return -EINVAL;
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return fsi_slave_write(dev->slave, dev->addr + addr, val, size);
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}
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EXPORT_SYMBOL_GPL(fsi_device_write);
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int fsi_device_peek(struct fsi_device *dev, void *val)
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{
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uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t));
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return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
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}
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static void fsi_device_release(struct device *_device)
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{
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struct fsi_device *device = to_fsi_dev(_device);
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of_node_put(device->dev.of_node);
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kfree(device);
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}
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static struct fsi_device *fsi_create_device(struct fsi_slave *slave)
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{
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struct fsi_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->dev.parent = &slave->dev;
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dev->dev.bus = &fsi_bus_type;
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dev->dev.release = fsi_device_release;
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return dev;
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}
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/* FSI slave support */
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static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
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uint8_t *idp)
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{
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uint32_t addr = *addrp;
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uint8_t id = *idp;
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if (addr > slave->size)
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return -EINVAL;
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/* For 23 bit addressing, we encode the extra two bits in the slave
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* id (and the slave's actual ID needs to be 0).
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*/
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if (addr > 0x1fffff) {
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if (slave->id != 0)
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return -EINVAL;
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id = (addr >> 21) & 0x3;
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addr &= 0x1fffff;
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}
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*addrp = addr;
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*idp = id;
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return 0;
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}
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static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
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{
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struct fsi_master *master = slave->master;
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__be32 irq, stat;
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int rc, link;
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uint8_t id;
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link = slave->link;
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id = slave->id;
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rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC,
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&irq, sizeof(irq));
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if (rc)
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return rc;
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rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT,
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&stat, sizeof(stat));
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if (rc)
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return rc;
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dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n",
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be32_to_cpu(stat), be32_to_cpu(irq));
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/* clear interrupts */
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return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC,
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&irq, sizeof(irq));
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}
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/* Encode slave local bus echo delay */
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static inline uint32_t fsi_smode_echodly(int x)
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{
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return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT;
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}
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/* Encode slave local bus send delay */
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static inline uint32_t fsi_smode_senddly(int x)
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{
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return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT;
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}
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/* Encode slave local bus clock rate ratio */
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static inline uint32_t fsi_smode_lbcrr(int x)
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{
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return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT;
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}
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/* Encode slave ID */
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static inline uint32_t fsi_smode_sid(int x)
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{
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return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT;
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}
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static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly)
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{
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return FSI_SMODE_WSC | FSI_SMODE_ECRC
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| fsi_smode_sid(id)
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| fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1)
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| fsi_smode_lbcrr(0x8);
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}
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static int fsi_slave_set_smode(struct fsi_slave *slave)
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{
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uint32_t smode;
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__be32 data;
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/* set our smode register with the slave ID field to 0; this enables
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* extended slave addressing
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*/
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smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay);
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data = cpu_to_be32(smode);
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return fsi_master_write(slave->master, slave->link, slave->id,
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FSI_SLAVE_BASE + FSI_SMODE,
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&data, sizeof(data));
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}
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static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
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uint32_t addr, size_t size)
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{
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struct fsi_master *master = slave->master;
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int rc, link;
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uint32_t reg;
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uint8_t id, send_delay, echo_delay;
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if (discard_errors)
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return -1;
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link = slave->link;
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id = slave->id;
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dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]",
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write ? "write" : "read", addr, size);
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/* try a simple clear of error conditions, which may fail if we've lost
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* communication with the slave
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*/
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rc = fsi_slave_report_and_clear_errors(slave);
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if (!rc)
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return 0;
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/* send a TERM and retry */
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if (master->term) {
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rc = master->term(master, link, id);
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if (!rc) {
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rc = fsi_master_read(master, link, id, 0,
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®, sizeof(reg));
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if (!rc)
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rc = fsi_slave_report_and_clear_errors(slave);
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if (!rc)
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return 0;
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}
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}
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send_delay = slave->t_send_delay;
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echo_delay = slave->t_echo_delay;
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/* getting serious, reset the slave via BREAK */
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rc = fsi_master_break(master, link);
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if (rc)
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return rc;
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slave->t_send_delay = send_delay;
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slave->t_echo_delay = echo_delay;
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rc = fsi_slave_set_smode(slave);
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if (rc)
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return rc;
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if (master->link_config)
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master->link_config(master, link,
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slave->t_send_delay,
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slave->t_echo_delay);
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return fsi_slave_report_and_clear_errors(slave);
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}
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int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
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void *val, size_t size)
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{
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uint8_t id = slave->id;
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int rc, err_rc, i;
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rc = fsi_slave_calc_addr(slave, &addr, &id);
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if (rc)
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return rc;
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for (i = 0; i < slave_retries; i++) {
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rc = fsi_master_read(slave->master, slave->link,
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id, addr, val, size);
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if (!rc)
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break;
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err_rc = fsi_slave_handle_error(slave, false, addr, size);
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if (err_rc)
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break;
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(fsi_slave_read);
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int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
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const void *val, size_t size)
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{
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uint8_t id = slave->id;
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int rc, err_rc, i;
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rc = fsi_slave_calc_addr(slave, &addr, &id);
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if (rc)
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return rc;
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for (i = 0; i < slave_retries; i++) {
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rc = fsi_master_write(slave->master, slave->link,
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id, addr, val, size);
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if (!rc)
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break;
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err_rc = fsi_slave_handle_error(slave, true, addr, size);
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if (err_rc)
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break;
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(fsi_slave_write);
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extern int fsi_slave_claim_range(struct fsi_slave *slave,
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uint32_t addr, uint32_t size)
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{
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if (addr + size < addr)
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return -EINVAL;
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if (addr + size > slave->size)
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return -EINVAL;
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/* todo: check for overlapping claims */
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return 0;
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}
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EXPORT_SYMBOL_GPL(fsi_slave_claim_range);
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extern void fsi_slave_release_range(struct fsi_slave *slave,
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uint32_t addr, uint32_t size)
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{
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}
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EXPORT_SYMBOL_GPL(fsi_slave_release_range);
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static bool fsi_device_node_matches(struct device *dev, struct device_node *np,
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uint32_t addr, uint32_t size)
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{
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unsigned int len, na, ns;
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const __be32 *prop;
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uint32_t psize;
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na = of_n_addr_cells(np);
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ns = of_n_size_cells(np);
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if (na != 1 || ns != 1)
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return false;
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prop = of_get_property(np, "reg", &len);
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if (!prop || len != 8)
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return false;
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if (of_read_number(prop, 1) != addr)
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return false;
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psize = of_read_number(prop + 1, 1);
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if (psize != size) {
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dev_warn(dev,
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"node %s matches probed address, but not size (got 0x%x, expected 0x%x)",
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of_node_full_name(np), psize, size);
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}
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return true;
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}
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/* Find a matching node for the slave engine at @address, using @size bytes
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* of space. Returns NULL if not found, or a matching node with refcount
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* already incremented.
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*/
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static struct device_node *fsi_device_find_of_node(struct fsi_device *dev)
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{
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struct device_node *parent, *np;
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parent = dev_of_node(&dev->slave->dev);
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if (!parent)
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return NULL;
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for_each_child_of_node(parent, np) {
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if (fsi_device_node_matches(&dev->dev, np,
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dev->addr, dev->size))
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return np;
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}
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return NULL;
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}
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static int fsi_slave_scan(struct fsi_slave *slave)
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{
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uint32_t engine_addr;
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int rc, i;
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/*
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* scan engines
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*
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* We keep the peek mode and slave engines for the core; so start
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* at the third slot in the configuration table. We also need to
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* skip the chip ID entry at the start of the address space.
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*/
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engine_addr = engine_page_size * 3;
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for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) {
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uint8_t slots, version, type, crc;
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struct fsi_device *dev;
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uint32_t conf;
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__be32 data;
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rc = fsi_slave_read(slave, (i + 1) * sizeof(data),
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&data, sizeof(data));
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if (rc) {
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dev_warn(&slave->dev,
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"error reading slave registers\n");
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return -1;
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}
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conf = be32_to_cpu(data);
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crc = crc4(0, conf, 32);
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if (crc) {
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dev_warn(&slave->dev,
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"crc error in slave register at 0x%04x\n",
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|
i);
|
|
return -1;
|
|
}
|
|
|
|
slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK)
|
|
>> FSI_SLAVE_CONF_SLOTS_SHIFT;
|
|
version = (conf & FSI_SLAVE_CONF_VERSION_MASK)
|
|
>> FSI_SLAVE_CONF_VERSION_SHIFT;
|
|
type = (conf & FSI_SLAVE_CONF_TYPE_MASK)
|
|
>> FSI_SLAVE_CONF_TYPE_SHIFT;
|
|
|
|
/*
|
|
* Unused address areas are marked by a zero type value; this
|
|
* skips the defined address areas
|
|
*/
|
|
if (type != 0 && slots != 0) {
|
|
|
|
/* create device */
|
|
dev = fsi_create_device(slave);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
dev->slave = slave;
|
|
dev->engine_type = type;
|
|
dev->version = version;
|
|
dev->unit = i;
|
|
dev->addr = engine_addr;
|
|
dev->size = slots * engine_page_size;
|
|
|
|
dev_dbg(&slave->dev,
|
|
"engine[%i]: type %x, version %x, addr %x size %x\n",
|
|
dev->unit, dev->engine_type, version,
|
|
dev->addr, dev->size);
|
|
|
|
dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x",
|
|
slave->master->idx, slave->link,
|
|
slave->id, i - 2);
|
|
dev->dev.of_node = fsi_device_find_of_node(dev);
|
|
|
|
rc = device_register(&dev->dev);
|
|
if (rc) {
|
|
dev_warn(&slave->dev, "add failed: %d\n", rc);
|
|
put_device(&dev->dev);
|
|
}
|
|
}
|
|
|
|
engine_addr += slots * engine_page_size;
|
|
|
|
if (!(conf & FSI_SLAVE_CONF_NEXT_MASK))
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long aligned_access_size(size_t offset, size_t count)
|
|
{
|
|
unsigned long offset_unit, count_unit;
|
|
|
|
/* Criteria:
|
|
*
|
|
* 1. Access size must be less than or equal to the maximum access
|
|
* width or the highest power-of-two factor of offset
|
|
* 2. Access size must be less than or equal to the amount specified by
|
|
* count
|
|
*
|
|
* The access width is optimal if we can calculate 1 to be strictly
|
|
* equal while still satisfying 2.
|
|
*/
|
|
|
|
/* Find 1 by the bottom bit of offset (with a 4 byte access cap) */
|
|
offset_unit = BIT(__builtin_ctzl(offset | 4));
|
|
|
|
/* Find 2 by the top bit of count */
|
|
count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count));
|
|
|
|
/* Constrain the maximum access width to the minimum of both criteria */
|
|
return BIT(__builtin_ctzl(offset_unit | count_unit));
|
|
}
|
|
|
|
static ssize_t fsi_slave_sysfs_raw_read(struct file *file,
|
|
struct kobject *kobj, struct bin_attribute *attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
|
|
size_t total_len, read_len;
|
|
int rc;
|
|
|
|
if (off < 0)
|
|
return -EINVAL;
|
|
|
|
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
|
|
return -EINVAL;
|
|
|
|
for (total_len = 0; total_len < count; total_len += read_len) {
|
|
read_len = aligned_access_size(off, count - total_len);
|
|
|
|
rc = fsi_slave_read(slave, off, buf + total_len, read_len);
|
|
if (rc)
|
|
return rc;
|
|
|
|
off += read_len;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t fsi_slave_sysfs_raw_write(struct file *file,
|
|
struct kobject *kobj, struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
|
|
size_t total_len, write_len;
|
|
int rc;
|
|
|
|
if (off < 0)
|
|
return -EINVAL;
|
|
|
|
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
|
|
return -EINVAL;
|
|
|
|
for (total_len = 0; total_len < count; total_len += write_len) {
|
|
write_len = aligned_access_size(off, count - total_len);
|
|
|
|
rc = fsi_slave_write(slave, off, buf + total_len, write_len);
|
|
if (rc)
|
|
return rc;
|
|
|
|
off += write_len;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct bin_attribute fsi_slave_raw_attr = {
|
|
.attr = {
|
|
.name = "raw",
|
|
.mode = 0600,
|
|
},
|
|
.size = 0,
|
|
.read = fsi_slave_sysfs_raw_read,
|
|
.write = fsi_slave_sysfs_raw_write,
|
|
};
|
|
|
|
static void fsi_slave_release(struct device *dev)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
fsi_free_minor(slave->dev.devt);
|
|
of_node_put(dev->of_node);
|
|
kfree(slave);
|
|
}
|
|
|
|
static bool fsi_slave_node_matches(struct device_node *np,
|
|
int link, uint8_t id)
|
|
{
|
|
unsigned int len, na, ns;
|
|
const __be32 *prop;
|
|
|
|
na = of_n_addr_cells(np);
|
|
ns = of_n_size_cells(np);
|
|
|
|
/* Ensure we have the correct format for addresses and sizes in
|
|
* reg properties
|
|
*/
|
|
if (na != 2 || ns != 0)
|
|
return false;
|
|
|
|
prop = of_get_property(np, "reg", &len);
|
|
if (!prop || len != 8)
|
|
return false;
|
|
|
|
return (of_read_number(prop, 1) == link) &&
|
|
(of_read_number(prop + 1, 1) == id);
|
|
}
|
|
|
|
/* Find a matching node for the slave at (link, id). Returns NULL if none
|
|
* found, or a matching node with refcount already incremented.
|
|
*/
|
|
static struct device_node *fsi_slave_find_of_node(struct fsi_master *master,
|
|
int link, uint8_t id)
|
|
{
|
|
struct device_node *parent, *np;
|
|
|
|
parent = dev_of_node(&master->dev);
|
|
if (!parent)
|
|
return NULL;
|
|
|
|
for_each_child_of_node(parent, np) {
|
|
if (fsi_slave_node_matches(np, link, id))
|
|
return np;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count,
|
|
loff_t *offset)
|
|
{
|
|
struct fsi_slave *slave = filep->private_data;
|
|
size_t total_len, read_len;
|
|
loff_t off = *offset;
|
|
ssize_t rc;
|
|
|
|
if (off < 0)
|
|
return -EINVAL;
|
|
|
|
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
|
|
return -EINVAL;
|
|
|
|
for (total_len = 0; total_len < count; total_len += read_len) {
|
|
__be32 data;
|
|
|
|
read_len = min_t(size_t, count, 4);
|
|
read_len -= off & 0x3;
|
|
|
|
rc = fsi_slave_read(slave, off, &data, read_len);
|
|
if (rc)
|
|
goto fail;
|
|
rc = copy_to_user(buf + total_len, &data, read_len);
|
|
if (rc) {
|
|
rc = -EFAULT;
|
|
goto fail;
|
|
}
|
|
off += read_len;
|
|
}
|
|
rc = count;
|
|
fail:
|
|
*offset = off;
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t cfam_write(struct file *filep, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct fsi_slave *slave = filep->private_data;
|
|
size_t total_len, write_len;
|
|
loff_t off = *offset;
|
|
ssize_t rc;
|
|
|
|
|
|
if (off < 0)
|
|
return -EINVAL;
|
|
|
|
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
|
|
return -EINVAL;
|
|
|
|
for (total_len = 0; total_len < count; total_len += write_len) {
|
|
__be32 data;
|
|
|
|
write_len = min_t(size_t, count, 4);
|
|
write_len -= off & 0x3;
|
|
|
|
rc = copy_from_user(&data, buf + total_len, write_len);
|
|
if (rc) {
|
|
rc = -EFAULT;
|
|
goto fail;
|
|
}
|
|
rc = fsi_slave_write(slave, off, &data, write_len);
|
|
if (rc)
|
|
goto fail;
|
|
off += write_len;
|
|
}
|
|
rc = count;
|
|
fail:
|
|
*offset = off;
|
|
return rc;
|
|
}
|
|
|
|
static loff_t cfam_llseek(struct file *file, loff_t offset, int whence)
|
|
{
|
|
switch (whence) {
|
|
case SEEK_CUR:
|
|
break;
|
|
case SEEK_SET:
|
|
file->f_pos = offset;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int cfam_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev);
|
|
|
|
file->private_data = slave;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations cfam_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = cfam_open,
|
|
.llseek = cfam_llseek,
|
|
.read = cfam_read,
|
|
.write = cfam_write,
|
|
};
|
|
|
|
static ssize_t send_term_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
struct fsi_master *master = slave->master;
|
|
|
|
if (!master->term)
|
|
return -ENODEV;
|
|
|
|
master->term(master, slave->link, slave->id);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_WO(send_term);
|
|
|
|
static ssize_t slave_send_echo_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
return sprintf(buf, "%u\n", slave->t_send_delay);
|
|
}
|
|
|
|
static ssize_t slave_send_echo_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
struct fsi_master *master = slave->master;
|
|
unsigned long val;
|
|
int rc;
|
|
|
|
if (kstrtoul(buf, 0, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
if (val < 1 || val > 16)
|
|
return -EINVAL;
|
|
|
|
if (!master->link_config)
|
|
return -ENXIO;
|
|
|
|
/* Current HW mandates that send and echo delay are identical */
|
|
slave->t_send_delay = val;
|
|
slave->t_echo_delay = val;
|
|
|
|
rc = fsi_slave_set_smode(slave);
|
|
if (rc < 0)
|
|
return rc;
|
|
if (master->link_config)
|
|
master->link_config(master, slave->link,
|
|
slave->t_send_delay,
|
|
slave->t_echo_delay);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(send_echo_delays, 0600,
|
|
slave_send_echo_show, slave_send_echo_store);
|
|
|
|
static ssize_t chip_id_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
return sprintf(buf, "%d\n", slave->chip_id);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(chip_id);
|
|
|
|
static ssize_t cfam_id_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
return sprintf(buf, "0x%x\n", slave->cfam_id);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(cfam_id);
|
|
|
|
static struct attribute *cfam_attr[] = {
|
|
&dev_attr_send_echo_delays.attr,
|
|
&dev_attr_chip_id.attr,
|
|
&dev_attr_cfam_id.attr,
|
|
&dev_attr_send_term.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group cfam_attr_group = {
|
|
.attrs = cfam_attr,
|
|
};
|
|
|
|
static const struct attribute_group *cfam_attr_groups[] = {
|
|
&cfam_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static char *cfam_devnode(struct device *dev, umode_t *mode,
|
|
kuid_t *uid, kgid_t *gid)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
#ifdef CONFIG_FSI_NEW_DEV_NODE
|
|
return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx);
|
|
#else
|
|
return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx);
|
|
#endif
|
|
}
|
|
|
|
static const struct device_type cfam_type = {
|
|
.name = "cfam",
|
|
.devnode = cfam_devnode,
|
|
.groups = cfam_attr_groups
|
|
};
|
|
|
|
static char *fsi_cdev_devnode(struct device *dev, umode_t *mode,
|
|
kuid_t *uid, kgid_t *gid)
|
|
{
|
|
#ifdef CONFIG_FSI_NEW_DEV_NODE
|
|
return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev));
|
|
#else
|
|
return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
|
|
#endif
|
|
}
|
|
|
|
const struct device_type fsi_cdev_type = {
|
|
.name = "fsi-cdev",
|
|
.devnode = fsi_cdev_devnode,
|
|
};
|
|
EXPORT_SYMBOL_GPL(fsi_cdev_type);
|
|
|
|
/* Backward compatible /dev/ numbering in "old style" mode */
|
|
static int fsi_adjust_index(int index)
|
|
{
|
|
#ifdef CONFIG_FSI_NEW_DEV_NODE
|
|
return index;
|
|
#else
|
|
return index + 1;
|
|
#endif
|
|
}
|
|
|
|
static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
|
|
dev_t *out_dev, int *out_index)
|
|
{
|
|
int cid = slave->chip_id;
|
|
int id;
|
|
|
|
/* Check if we qualify for legacy numbering */
|
|
if (cid >= 0 && cid < 16 && type < 4) {
|
|
/* Try reserving the legacy number */
|
|
id = (cid << 4) | type;
|
|
id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL);
|
|
if (id >= 0) {
|
|
*out_index = fsi_adjust_index(cid);
|
|
*out_dev = fsi_base_dev + id;
|
|
return 0;
|
|
}
|
|
/* Other failure */
|
|
if (id != -ENOSPC)
|
|
return id;
|
|
/* Fallback to non-legacy allocation */
|
|
}
|
|
id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP,
|
|
FSI_CHAR_MAX_DEVICES, GFP_KERNEL);
|
|
if (id < 0)
|
|
return id;
|
|
*out_index = fsi_adjust_index(id);
|
|
*out_dev = fsi_base_dev + id;
|
|
return 0;
|
|
}
|
|
|
|
int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
|
|
dev_t *out_dev, int *out_index)
|
|
{
|
|
return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_get_new_minor);
|
|
|
|
void fsi_free_minor(dev_t dev)
|
|
{
|
|
ida_simple_remove(&fsi_minor_ida, MINOR(dev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_free_minor);
|
|
|
|
static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
|
|
{
|
|
uint32_t cfam_id;
|
|
struct fsi_slave *slave;
|
|
uint8_t crc;
|
|
__be32 data, llmode, slbus;
|
|
int rc;
|
|
|
|
/* Currently, we only support single slaves on a link, and use the
|
|
* full 23-bit address range
|
|
*/
|
|
if (id != 0)
|
|
return -EINVAL;
|
|
|
|
rc = fsi_master_read(master, link, id, 0, &data, sizeof(data));
|
|
if (rc) {
|
|
dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n",
|
|
link, id, rc);
|
|
return -ENODEV;
|
|
}
|
|
cfam_id = be32_to_cpu(data);
|
|
|
|
crc = crc4(0, cfam_id, 32);
|
|
if (crc) {
|
|
dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n",
|
|
link, id);
|
|
return -EIO;
|
|
}
|
|
|
|
dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
|
|
cfam_id, master->idx, link, id);
|
|
|
|
/* If we're behind a master that doesn't provide a self-running bus
|
|
* clock, put the slave into async mode
|
|
*/
|
|
if (master->flags & FSI_MASTER_FLAG_SWCLOCK) {
|
|
llmode = cpu_to_be32(FSI_LLMODE_ASYNC);
|
|
rc = fsi_master_write(master, link, id,
|
|
FSI_SLAVE_BASE + FSI_LLMODE,
|
|
&llmode, sizeof(llmode));
|
|
if (rc)
|
|
dev_warn(&master->dev,
|
|
"can't set llmode on slave:%02x:%02x %d\n",
|
|
link, id, rc);
|
|
}
|
|
|
|
/* We can communicate with a slave; create the slave device and
|
|
* register.
|
|
*/
|
|
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
|
|
if (!slave)
|
|
return -ENOMEM;
|
|
|
|
dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
|
|
slave->dev.type = &cfam_type;
|
|
slave->dev.parent = &master->dev;
|
|
slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
|
|
slave->dev.release = fsi_slave_release;
|
|
device_initialize(&slave->dev);
|
|
slave->cfam_id = cfam_id;
|
|
slave->master = master;
|
|
slave->link = link;
|
|
slave->id = id;
|
|
slave->size = FSI_SLAVE_SIZE_23b;
|
|
slave->t_send_delay = 16;
|
|
slave->t_echo_delay = 16;
|
|
|
|
/* Get chip ID if any */
|
|
slave->chip_id = -1;
|
|
if (slave->dev.of_node) {
|
|
uint32_t prop;
|
|
if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop))
|
|
slave->chip_id = prop;
|
|
|
|
}
|
|
|
|
slbus = cpu_to_be32(FSI_SLBUS_FORCE);
|
|
rc = fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SLBUS,
|
|
&slbus, sizeof(slbus));
|
|
if (rc)
|
|
dev_warn(&master->dev,
|
|
"can't set slbus on slave:%02x:%02x %d\n", link, id,
|
|
rc);
|
|
|
|
rc = fsi_slave_set_smode(slave);
|
|
if (rc) {
|
|
dev_warn(&master->dev,
|
|
"can't set smode on slave:%02x:%02x %d\n",
|
|
link, id, rc);
|
|
goto err_free;
|
|
}
|
|
|
|
/* Allocate a minor in the FSI space */
|
|
rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt,
|
|
&slave->cdev_idx);
|
|
if (rc)
|
|
goto err_free;
|
|
|
|
/* Create chardev for userspace access */
|
|
cdev_init(&slave->cdev, &cfam_fops);
|
|
rc = cdev_device_add(&slave->cdev, &slave->dev);
|
|
if (rc) {
|
|
dev_err(&slave->dev, "Error %d creating slave device\n", rc);
|
|
goto err_free_ida;
|
|
}
|
|
|
|
/* Now that we have the cdev registered with the core, any fatal
|
|
* failures beyond this point will need to clean up through
|
|
* cdev_device_del(). Fortunately though, nothing past here is fatal.
|
|
*/
|
|
|
|
if (master->link_config)
|
|
master->link_config(master, link,
|
|
slave->t_send_delay,
|
|
slave->t_echo_delay);
|
|
|
|
/* Legacy raw file -> to be removed */
|
|
rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr);
|
|
if (rc)
|
|
dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc);
|
|
|
|
|
|
rc = fsi_slave_scan(slave);
|
|
if (rc)
|
|
dev_dbg(&master->dev, "failed during slave scan with: %d\n",
|
|
rc);
|
|
|
|
return 0;
|
|
|
|
err_free_ida:
|
|
fsi_free_minor(slave->dev.devt);
|
|
err_free:
|
|
of_node_put(slave->dev.of_node);
|
|
kfree(slave);
|
|
return rc;
|
|
}
|
|
|
|
/* FSI master support */
|
|
static int fsi_check_access(uint32_t addr, size_t size)
|
|
{
|
|
if (size == 4) {
|
|
if (addr & 0x3)
|
|
return -EINVAL;
|
|
} else if (size == 2) {
|
|
if (addr & 0x1)
|
|
return -EINVAL;
|
|
} else if (size != 1)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fsi_master_read(struct fsi_master *master, int link,
|
|
uint8_t slave_id, uint32_t addr, void *val, size_t size)
|
|
{
|
|
int rc;
|
|
|
|
trace_fsi_master_read(master, link, slave_id, addr, size);
|
|
|
|
rc = fsi_check_access(addr, size);
|
|
if (!rc)
|
|
rc = master->read(master, link, slave_id, addr, val, size);
|
|
|
|
trace_fsi_master_rw_result(master, link, slave_id, addr, size,
|
|
false, val, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int fsi_master_write(struct fsi_master *master, int link,
|
|
uint8_t slave_id, uint32_t addr, const void *val, size_t size)
|
|
{
|
|
int rc;
|
|
|
|
trace_fsi_master_write(master, link, slave_id, addr, size, val);
|
|
|
|
rc = fsi_check_access(addr, size);
|
|
if (!rc)
|
|
rc = master->write(master, link, slave_id, addr, val, size);
|
|
|
|
trace_fsi_master_rw_result(master, link, slave_id, addr, size,
|
|
true, val, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int fsi_master_link_disable(struct fsi_master *master, int link)
|
|
{
|
|
if (master->link_enable)
|
|
return master->link_enable(master, link, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fsi_master_link_enable(struct fsi_master *master, int link)
|
|
{
|
|
if (master->link_enable)
|
|
return master->link_enable(master, link, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Issue a break command on this link
|
|
*/
|
|
static int fsi_master_break(struct fsi_master *master, int link)
|
|
{
|
|
int rc = 0;
|
|
|
|
trace_fsi_master_break(master, link);
|
|
|
|
if (master->send_break)
|
|
rc = master->send_break(master, link);
|
|
if (master->link_config)
|
|
master->link_config(master, link, 16, 16);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int fsi_master_scan(struct fsi_master *master)
|
|
{
|
|
int link, rc;
|
|
|
|
for (link = 0; link < master->n_links; link++) {
|
|
rc = fsi_master_link_enable(master, link);
|
|
if (rc) {
|
|
dev_dbg(&master->dev,
|
|
"enable link %d failed: %d\n", link, rc);
|
|
continue;
|
|
}
|
|
rc = fsi_master_break(master, link);
|
|
if (rc) {
|
|
fsi_master_link_disable(master, link);
|
|
dev_dbg(&master->dev,
|
|
"break to link %d failed: %d\n", link, rc);
|
|
continue;
|
|
}
|
|
|
|
rc = fsi_slave_init(master, link, 0);
|
|
if (rc)
|
|
fsi_master_link_disable(master, link);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fsi_slave_remove_device(struct device *dev, void *arg)
|
|
{
|
|
device_unregister(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int fsi_master_remove_slave(struct device *dev, void *arg)
|
|
{
|
|
struct fsi_slave *slave = to_fsi_slave(dev);
|
|
|
|
device_for_each_child(dev, NULL, fsi_slave_remove_device);
|
|
cdev_device_del(&slave->cdev, &slave->dev);
|
|
put_device(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void fsi_master_unscan(struct fsi_master *master)
|
|
{
|
|
device_for_each_child(&master->dev, NULL, fsi_master_remove_slave);
|
|
}
|
|
|
|
int fsi_master_rescan(struct fsi_master *master)
|
|
{
|
|
int rc;
|
|
|
|
mutex_lock(&master->scan_lock);
|
|
fsi_master_unscan(master);
|
|
rc = fsi_master_scan(master);
|
|
mutex_unlock(&master->scan_lock);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_master_rescan);
|
|
|
|
static ssize_t master_rescan_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct fsi_master *master = to_fsi_master(dev);
|
|
int rc;
|
|
|
|
rc = fsi_master_rescan(master);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store);
|
|
|
|
static ssize_t master_break_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct fsi_master *master = to_fsi_master(dev);
|
|
|
|
fsi_master_break(master, 0);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(break, 0200, NULL, master_break_store);
|
|
|
|
static struct attribute *master_attrs[] = {
|
|
&dev_attr_break.attr,
|
|
&dev_attr_rescan.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(master);
|
|
|
|
static struct class fsi_master_class = {
|
|
.name = "fsi-master",
|
|
.dev_groups = master_groups,
|
|
};
|
|
|
|
int fsi_master_register(struct fsi_master *master)
|
|
{
|
|
int rc;
|
|
struct device_node *np;
|
|
|
|
mutex_init(&master->scan_lock);
|
|
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
|
|
dev_set_name(&master->dev, "fsi%d", master->idx);
|
|
master->dev.class = &fsi_master_class;
|
|
|
|
rc = device_register(&master->dev);
|
|
if (rc) {
|
|
ida_simple_remove(&master_ida, master->idx);
|
|
return rc;
|
|
}
|
|
|
|
np = dev_of_node(&master->dev);
|
|
if (!of_property_read_bool(np, "no-scan-on-init")) {
|
|
mutex_lock(&master->scan_lock);
|
|
fsi_master_scan(master);
|
|
mutex_unlock(&master->scan_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_master_register);
|
|
|
|
void fsi_master_unregister(struct fsi_master *master)
|
|
{
|
|
if (master->idx >= 0) {
|
|
ida_simple_remove(&master_ida, master->idx);
|
|
master->idx = -1;
|
|
}
|
|
|
|
mutex_lock(&master->scan_lock);
|
|
fsi_master_unscan(master);
|
|
mutex_unlock(&master->scan_lock);
|
|
device_unregister(&master->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_master_unregister);
|
|
|
|
/* FSI core & Linux bus type definitions */
|
|
|
|
static int fsi_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct fsi_device *fsi_dev = to_fsi_dev(dev);
|
|
struct fsi_driver *fsi_drv = to_fsi_drv(drv);
|
|
const struct fsi_device_id *id;
|
|
|
|
if (!fsi_drv->id_table)
|
|
return 0;
|
|
|
|
for (id = fsi_drv->id_table; id->engine_type; id++) {
|
|
if (id->engine_type != fsi_dev->engine_type)
|
|
continue;
|
|
if (id->version == FSI_VERSION_ANY ||
|
|
id->version == fsi_dev->version)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fsi_driver_register(struct fsi_driver *fsi_drv)
|
|
{
|
|
if (!fsi_drv)
|
|
return -EINVAL;
|
|
if (!fsi_drv->id_table)
|
|
return -EINVAL;
|
|
|
|
return driver_register(&fsi_drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_driver_register);
|
|
|
|
void fsi_driver_unregister(struct fsi_driver *fsi_drv)
|
|
{
|
|
driver_unregister(&fsi_drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsi_driver_unregister);
|
|
|
|
struct bus_type fsi_bus_type = {
|
|
.name = "fsi",
|
|
.match = fsi_bus_match,
|
|
};
|
|
EXPORT_SYMBOL_GPL(fsi_bus_type);
|
|
|
|
static int __init fsi_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi");
|
|
if (rc)
|
|
return rc;
|
|
rc = bus_register(&fsi_bus_type);
|
|
if (rc)
|
|
goto fail_bus;
|
|
|
|
rc = class_register(&fsi_master_class);
|
|
if (rc)
|
|
goto fail_class;
|
|
|
|
return 0;
|
|
|
|
fail_class:
|
|
bus_unregister(&fsi_bus_type);
|
|
fail_bus:
|
|
unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
|
|
return rc;
|
|
}
|
|
postcore_initcall(fsi_init);
|
|
|
|
static void fsi_exit(void)
|
|
{
|
|
class_unregister(&fsi_master_class);
|
|
bus_unregister(&fsi_bus_type);
|
|
unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
|
|
ida_destroy(&fsi_minor_ida);
|
|
}
|
|
module_exit(fsi_exit);
|
|
module_param(discard_errors, int, 0664);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses");
|