1639 lines
45 KiB
C
1639 lines
45 KiB
C
/*
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* This file is provided under a GPLv2 license. When using or
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* redistributing this file, you may do so under that license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright (C) 2016 T-Platforms. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, it can be found <http://www.gnu.org/licenses/>.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* IDT PCIe-switch NTB Linux driver
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*
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* Contact Information:
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* Serge Semin <fancer.lancer@gmail.com>, <Sergey.Semin@t-platforms.ru>
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*/
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/*
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* NOTE of the IDT 89HPESx SMBus-slave interface driver
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* This driver primarily is developed to have an access to EEPROM device of
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* IDT PCIe-switches. IDT provides a simple SMBus interface to perform IO-
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* operations from/to EEPROM, which is located at private (so called Master)
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* SMBus of switches. Using that interface this the driver creates a simple
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* binary sysfs-file in the device directory:
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* /sys/bus/i2c/devices/<bus>-<devaddr>/eeprom
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* In case if read-only flag is specified in the dts-node of device desription,
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* User-space applications won't be able to write to the EEPROM sysfs-node.
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* Additionally IDT 89HPESx SMBus interface has an ability to write/read
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* data of device CSRs. This driver exposes debugf-file to perform simple IO
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* operations using that ability for just basic debug purpose. Particularly
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* next file is created in the specific debugfs-directory:
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* /sys/kernel/debug/idt_csr/
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* Format of the debugfs-node is:
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* $ cat /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
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* <CSR address>:<CSR value>
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* So reading the content of the file gives current CSR address and it value.
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* If User-space application wishes to change current CSR address,
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* it can just write a proper value to the sysfs-file:
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* $ echo "<CSR address>" > /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>
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* If it wants to change the CSR value as well, the format of the write
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* operation is:
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* $ echo "<CSR address>:<CSR value>" > \
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* /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
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* CSR address and value can be any of hexadecimal, decimal or octal format.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <linux/debugfs.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of.h>
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#include <linux/i2c.h>
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#include <linux/pci_ids.h>
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#include <linux/delay.h>
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#define IDT_NAME "89hpesx"
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#define IDT_89HPESX_DESC "IDT 89HPESx SMBus-slave interface driver"
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#define IDT_89HPESX_VER "1.0"
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MODULE_DESCRIPTION(IDT_89HPESX_DESC);
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MODULE_VERSION(IDT_89HPESX_VER);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("T-platforms");
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/*
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* csr_dbgdir - CSR read/write operations Debugfs directory
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*/
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static struct dentry *csr_dbgdir;
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/*
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* struct idt_89hpesx_dev - IDT 89HPESx device data structure
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* @eesize: Size of EEPROM in bytes (calculated from "idt,eecompatible")
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* @eero: EEPROM Read-only flag
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* @eeaddr: EEPROM custom address
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*
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* @inieecmd: Initial cmd value for EEPROM read/write operations
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* @inicsrcmd: Initial cmd value for CSR read/write operations
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* @iniccode: Initialial command code value for IO-operations
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*
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* @csr: CSR address to perform read operation
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*
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* @smb_write: SMBus write method
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* @smb_read: SMBus read method
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* @smb_mtx: SMBus mutex
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*
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* @client: i2c client used to perform IO operations
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*
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* @ee_file: EEPROM read/write sysfs-file
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* @csr_file: CSR read/write debugfs-node
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*/
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struct idt_smb_seq;
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struct idt_89hpesx_dev {
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u32 eesize;
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bool eero;
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u8 eeaddr;
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u8 inieecmd;
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u8 inicsrcmd;
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u8 iniccode;
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u16 csr;
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int (*smb_write)(struct idt_89hpesx_dev *, const struct idt_smb_seq *);
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int (*smb_read)(struct idt_89hpesx_dev *, struct idt_smb_seq *);
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struct mutex smb_mtx;
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struct i2c_client *client;
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struct bin_attribute *ee_file;
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struct dentry *csr_dir;
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struct dentry *csr_file;
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};
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/*
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* struct idt_smb_seq - sequence of data to be read/written from/to IDT 89HPESx
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* @ccode: SMBus command code
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* @bytecnt: Byte count of operation
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* @data: Data to by written
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*/
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struct idt_smb_seq {
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u8 ccode;
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u8 bytecnt;
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u8 *data;
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};
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/*
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* struct idt_eeprom_seq - sequence of data to be read/written from/to EEPROM
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* @cmd: Transaction CMD
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* @eeaddr: EEPROM custom address
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* @memaddr: Internal memory address of EEPROM
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* @data: Data to be written at the memory address
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*/
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struct idt_eeprom_seq {
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u8 cmd;
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u8 eeaddr;
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u16 memaddr;
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u8 data;
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} __packed;
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/*
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* struct idt_csr_seq - sequence of data to be read/written from/to CSR
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* @cmd: Transaction CMD
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* @csraddr: Internal IDT device CSR address
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* @data: Data to be read/written from/to the CSR address
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*/
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struct idt_csr_seq {
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u8 cmd;
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u16 csraddr;
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u32 data;
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} __packed;
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/*
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* SMBus command code macros
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* @CCODE_END: Indicates the end of transaction
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* @CCODE_START: Indicates the start of transaction
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* @CCODE_CSR: CSR read/write transaction
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* @CCODE_EEPROM: EEPROM read/write transaction
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* @CCODE_BYTE: Supplied data has BYTE length
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* @CCODE_WORD: Supplied data has WORD length
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* @CCODE_BLOCK: Supplied data has variable length passed in bytecnt
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* byte right following CCODE byte
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*/
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#define CCODE_END ((u8)0x01)
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#define CCODE_START ((u8)0x02)
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#define CCODE_CSR ((u8)0x00)
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#define CCODE_EEPROM ((u8)0x04)
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#define CCODE_BYTE ((u8)0x00)
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#define CCODE_WORD ((u8)0x20)
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#define CCODE_BLOCK ((u8)0x40)
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#define CCODE_PEC ((u8)0x80)
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/*
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* EEPROM command macros
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* @EEPROM_OP_WRITE: EEPROM write operation
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* @EEPROM_OP_READ: EEPROM read operation
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* @EEPROM_USA: Use specified address of EEPROM
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* @EEPROM_NAERR: EEPROM device is not ready to respond
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* @EEPROM_LAERR: EEPROM arbitration loss error
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* @EEPROM_MSS: EEPROM misplace start & stop bits error
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* @EEPROM_WR_CNT: Bytes count to perform write operation
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* @EEPROM_WRRD_CNT: Bytes count to write before reading
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* @EEPROM_RD_CNT: Bytes count to perform read operation
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* @EEPROM_DEF_SIZE: Fall back size of EEPROM
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* @EEPROM_DEF_ADDR: Defatul EEPROM address
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* @EEPROM_TOUT: Timeout before retry read operation if eeprom is busy
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*/
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#define EEPROM_OP_WRITE ((u8)0x00)
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#define EEPROM_OP_READ ((u8)0x01)
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#define EEPROM_USA ((u8)0x02)
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#define EEPROM_NAERR ((u8)0x08)
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#define EEPROM_LAERR ((u8)0x10)
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#define EEPROM_MSS ((u8)0x20)
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#define EEPROM_WR_CNT ((u8)5)
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#define EEPROM_WRRD_CNT ((u8)4)
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#define EEPROM_RD_CNT ((u8)5)
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#define EEPROM_DEF_SIZE ((u16)4096)
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#define EEPROM_DEF_ADDR ((u8)0x50)
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#define EEPROM_TOUT (100)
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/*
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* CSR command macros
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* @CSR_DWE: Enable all four bytes of the operation
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* @CSR_OP_WRITE: CSR write operation
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* @CSR_OP_READ: CSR read operation
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* @CSR_RERR: Read operation error
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* @CSR_WERR: Write operation error
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* @CSR_WR_CNT: Bytes count to perform write operation
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* @CSR_WRRD_CNT: Bytes count to write before reading
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* @CSR_RD_CNT: Bytes count to perform read operation
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* @CSR_MAX: Maximum CSR address
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* @CSR_DEF: Default CSR address
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* @CSR_REAL_ADDR: CSR real unshifted address
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*/
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#define CSR_DWE ((u8)0x0F)
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#define CSR_OP_WRITE ((u8)0x00)
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#define CSR_OP_READ ((u8)0x10)
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#define CSR_RERR ((u8)0x40)
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#define CSR_WERR ((u8)0x80)
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#define CSR_WR_CNT ((u8)7)
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#define CSR_WRRD_CNT ((u8)3)
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#define CSR_RD_CNT ((u8)7)
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#define CSR_MAX ((u32)0x3FFFF)
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#define CSR_DEF ((u16)0x0000)
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#define CSR_REAL_ADDR(val) ((unsigned int)val << 2)
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/*
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* IDT 89HPESx basic register
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* @IDT_VIDDID_CSR: PCIe VID and DID of IDT 89HPESx
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* @IDT_VID_MASK: Mask of VID
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*/
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#define IDT_VIDDID_CSR ((u32)0x0000)
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#define IDT_VID_MASK ((u32)0xFFFF)
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/*
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* IDT 89HPESx can send NACK when new command is sent before previous one
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* fininshed execution. In this case driver retries operation
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* certain times.
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* @RETRY_CNT: Number of retries before giving up and fail
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* @idt_smb_safe: Generate a retry loop on corresponding SMBus method
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*/
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#define RETRY_CNT (128)
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#define idt_smb_safe(ops, args...) ({ \
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int __retry = RETRY_CNT; \
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s32 __sts; \
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do { \
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__sts = i2c_smbus_ ## ops ## _data(args); \
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} while (__retry-- && __sts < 0); \
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__sts; \
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})
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/*===========================================================================
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* i2c bus level IO-operations
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*===========================================================================
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*/
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/*
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* idt_smb_write_byte() - SMBus write method when I2C_SMBUS_BYTE_DATA operation
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* is only available
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* @pdev: Pointer to the driver data
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* @seq: Sequence of data to be written
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*/
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static int idt_smb_write_byte(struct idt_89hpesx_dev *pdev,
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const struct idt_smb_seq *seq)
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{
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s32 sts;
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u8 ccode;
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int idx;
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/* Loop over the supplied data sending byte one-by-one */
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for (idx = 0; idx < seq->bytecnt; idx++) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_BYTE;
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if (idx == 0)
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ccode |= CCODE_START;
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if (idx == seq->bytecnt - 1)
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ccode |= CCODE_END;
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/* Send data to the device */
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sts = idt_smb_safe(write_byte, pdev->client, ccode,
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seq->data[idx]);
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if (sts != 0)
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return (int)sts;
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}
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return 0;
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}
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/*
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* idt_smb_read_byte() - SMBus read method when I2C_SMBUS_BYTE_DATA operation
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* is only available
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* @pdev: Pointer to the driver data
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* @seq: Buffer to read data to
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*/
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static int idt_smb_read_byte(struct idt_89hpesx_dev *pdev,
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struct idt_smb_seq *seq)
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{
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s32 sts;
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u8 ccode;
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int idx;
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/* Loop over the supplied buffer receiving byte one-by-one */
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for (idx = 0; idx < seq->bytecnt; idx++) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_BYTE;
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if (idx == 0)
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ccode |= CCODE_START;
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if (idx == seq->bytecnt - 1)
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ccode |= CCODE_END;
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/* Read data from the device */
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sts = idt_smb_safe(read_byte, pdev->client, ccode);
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if (sts < 0)
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return (int)sts;
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seq->data[idx] = (u8)sts;
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}
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return 0;
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}
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/*
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* idt_smb_write_word() - SMBus write method when I2C_SMBUS_BYTE_DATA and
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* I2C_FUNC_SMBUS_WORD_DATA operations are available
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* @pdev: Pointer to the driver data
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* @seq: Sequence of data to be written
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*/
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static int idt_smb_write_word(struct idt_89hpesx_dev *pdev,
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const struct idt_smb_seq *seq)
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{
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s32 sts;
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u8 ccode;
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int idx, evencnt;
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/* Calculate the even count of data to send */
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evencnt = seq->bytecnt - (seq->bytecnt % 2);
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/* Loop over the supplied data sending two bytes at a time */
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for (idx = 0; idx < evencnt; idx += 2) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_WORD;
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if (idx == 0)
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ccode |= CCODE_START;
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if (idx == evencnt - 2)
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ccode |= CCODE_END;
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/* Send word data to the device */
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sts = idt_smb_safe(write_word, pdev->client, ccode,
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*(u16 *)&seq->data[idx]);
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if (sts != 0)
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return (int)sts;
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}
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/* If there is odd number of bytes then send just one last byte */
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if (seq->bytecnt != evencnt) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_BYTE | CCODE_END;
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if (idx == 0)
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ccode |= CCODE_START;
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/* Send byte data to the device */
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sts = idt_smb_safe(write_byte, pdev->client, ccode,
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seq->data[idx]);
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if (sts != 0)
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return (int)sts;
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}
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return 0;
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}
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/*
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* idt_smb_read_word() - SMBus read method when I2C_SMBUS_BYTE_DATA and
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* I2C_FUNC_SMBUS_WORD_DATA operations are available
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* @pdev: Pointer to the driver data
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* @seq: Buffer to read data to
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*/
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static int idt_smb_read_word(struct idt_89hpesx_dev *pdev,
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struct idt_smb_seq *seq)
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{
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s32 sts;
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u8 ccode;
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int idx, evencnt;
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/* Calculate the even count of data to send */
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evencnt = seq->bytecnt - (seq->bytecnt % 2);
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/* Loop over the supplied data reading two bytes at a time */
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for (idx = 0; idx < evencnt; idx += 2) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_WORD;
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if (idx == 0)
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ccode |= CCODE_START;
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if (idx == evencnt - 2)
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ccode |= CCODE_END;
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/* Read word data from the device */
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sts = idt_smb_safe(read_word, pdev->client, ccode);
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if (sts < 0)
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return (int)sts;
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*(u16 *)&seq->data[idx] = (u16)sts;
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}
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/* If there is odd number of bytes then receive just one last byte */
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if (seq->bytecnt != evencnt) {
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_BYTE | CCODE_END;
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if (idx == 0)
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ccode |= CCODE_START;
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/* Read last data byte from the device */
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sts = idt_smb_safe(read_byte, pdev->client, ccode);
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if (sts < 0)
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return (int)sts;
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seq->data[idx] = (u8)sts;
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}
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return 0;
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}
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/*
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* idt_smb_write_block() - SMBus write method when I2C_SMBUS_BLOCK_DATA
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* operation is available
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* @pdev: Pointer to the driver data
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* @seq: Sequence of data to be written
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*/
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static int idt_smb_write_block(struct idt_89hpesx_dev *pdev,
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const struct idt_smb_seq *seq)
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{
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u8 ccode;
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/* Return error if too much data passed to send */
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if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
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return -EINVAL;
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/* Collect the command code byte */
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ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
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/* Send block of data to the device */
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return idt_smb_safe(write_block, pdev->client, ccode, seq->bytecnt,
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seq->data);
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}
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/*
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|
* idt_smb_read_block() - SMBus read method when I2C_SMBUS_BLOCK_DATA
|
|
* operation is available
|
|
* @pdev: Pointer to the driver data
|
|
* @seq: Buffer to read data to
|
|
*/
|
|
static int idt_smb_read_block(struct idt_89hpesx_dev *pdev,
|
|
struct idt_smb_seq *seq)
|
|
{
|
|
s32 sts;
|
|
u8 ccode;
|
|
|
|
/* Return error if too much data passed to send */
|
|
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
|
|
return -EINVAL;
|
|
|
|
/* Collect the command code byte */
|
|
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
|
|
|
|
/* Read block of data from the device */
|
|
sts = idt_smb_safe(read_block, pdev->client, ccode, seq->data);
|
|
if (sts != seq->bytecnt)
|
|
return (sts < 0 ? sts : -ENODATA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idt_smb_write_i2c_block() - SMBus write method when I2C_SMBUS_I2C_BLOCK_DATA
|
|
* operation is available
|
|
* @pdev: Pointer to the driver data
|
|
* @seq: Sequence of data to be written
|
|
*
|
|
* NOTE It's usual SMBus write block operation, except the actual data length is
|
|
* sent as first byte of data
|
|
*/
|
|
static int idt_smb_write_i2c_block(struct idt_89hpesx_dev *pdev,
|
|
const struct idt_smb_seq *seq)
|
|
{
|
|
u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
|
|
|
|
/* Return error if too much data passed to send */
|
|
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
|
|
return -EINVAL;
|
|
|
|
/* Collect the data to send. Length byte must be added prior the data */
|
|
buf[0] = seq->bytecnt;
|
|
memcpy(&buf[1], seq->data, seq->bytecnt);
|
|
|
|
/* Collect the command code byte */
|
|
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
|
|
|
|
/* Send length and block of data to the device */
|
|
return idt_smb_safe(write_i2c_block, pdev->client, ccode,
|
|
seq->bytecnt + 1, buf);
|
|
}
|
|
|
|
/*
|
|
* idt_smb_read_i2c_block() - SMBus read method when I2C_SMBUS_I2C_BLOCK_DATA
|
|
* operation is available
|
|
* @pdev: Pointer to the driver data
|
|
* @seq: Buffer to read data to
|
|
*
|
|
* NOTE It's usual SMBus read block operation, except the actual data length is
|
|
* retrieved as first byte of data
|
|
*/
|
|
static int idt_smb_read_i2c_block(struct idt_89hpesx_dev *pdev,
|
|
struct idt_smb_seq *seq)
|
|
{
|
|
u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
|
|
s32 sts;
|
|
|
|
/* Return error if too much data passed to send */
|
|
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
|
|
return -EINVAL;
|
|
|
|
/* Collect the command code byte */
|
|
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
|
|
|
|
/* Read length and block of data from the device */
|
|
sts = idt_smb_safe(read_i2c_block, pdev->client, ccode,
|
|
seq->bytecnt + 1, buf);
|
|
if (sts != seq->bytecnt + 1)
|
|
return (sts < 0 ? sts : -ENODATA);
|
|
if (buf[0] != seq->bytecnt)
|
|
return -ENODATA;
|
|
|
|
/* Copy retrieved data to the output data buffer */
|
|
memcpy(seq->data, &buf[1], seq->bytecnt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================
|
|
* EEPROM IO-operations
|
|
*===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* idt_eeprom_read_byte() - read just one byte from EEPROM
|
|
* @pdev: Pointer to the driver data
|
|
* @memaddr: Start EEPROM memory address
|
|
* @data: Data to be written to EEPROM
|
|
*/
|
|
static int idt_eeprom_read_byte(struct idt_89hpesx_dev *pdev, u16 memaddr,
|
|
u8 *data)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
struct idt_eeprom_seq eeseq;
|
|
struct idt_smb_seq smbseq;
|
|
int ret, retry;
|
|
|
|
/* Initialize SMBus sequence fields */
|
|
smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
|
|
smbseq.data = (u8 *)&eeseq;
|
|
|
|
/*
|
|
* Sometimes EEPROM may respond with NACK if it's busy with previous
|
|
* operation, so we need to perform a few attempts of read cycle
|
|
*/
|
|
retry = RETRY_CNT;
|
|
do {
|
|
/* Send EEPROM memory address to read data from */
|
|
smbseq.bytecnt = EEPROM_WRRD_CNT;
|
|
eeseq.cmd = pdev->inieecmd | EEPROM_OP_READ;
|
|
eeseq.eeaddr = pdev->eeaddr;
|
|
eeseq.memaddr = cpu_to_le16(memaddr);
|
|
ret = pdev->smb_write(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to init eeprom addr 0x%02hhx",
|
|
memaddr);
|
|
break;
|
|
}
|
|
|
|
/* Perform read operation */
|
|
smbseq.bytecnt = EEPROM_RD_CNT;
|
|
ret = pdev->smb_read(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to read eeprom data 0x%02hhx",
|
|
memaddr);
|
|
break;
|
|
}
|
|
|
|
/* Restart read operation if the device is busy */
|
|
if (retry && (eeseq.cmd & EEPROM_NAERR)) {
|
|
dev_dbg(dev, "EEPROM busy, retry reading after %d ms",
|
|
EEPROM_TOUT);
|
|
msleep(EEPROM_TOUT);
|
|
continue;
|
|
}
|
|
|
|
/* Check whether IDT successfully read data from EEPROM */
|
|
if (eeseq.cmd & (EEPROM_NAERR | EEPROM_LAERR | EEPROM_MSS)) {
|
|
dev_err(dev,
|
|
"Communication with eeprom failed, cmd 0x%hhx",
|
|
eeseq.cmd);
|
|
ret = -EREMOTEIO;
|
|
break;
|
|
}
|
|
|
|
/* Save retrieved data and exit the loop */
|
|
*data = eeseq.data;
|
|
break;
|
|
} while (retry--);
|
|
|
|
/* Return the status of operation */
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* idt_eeprom_write() - EEPROM write operation
|
|
* @pdev: Pointer to the driver data
|
|
* @memaddr: Start EEPROM memory address
|
|
* @len: Length of data to be written
|
|
* @data: Data to be written to EEPROM
|
|
*/
|
|
static int idt_eeprom_write(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
|
|
const u8 *data)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
struct idt_eeprom_seq eeseq;
|
|
struct idt_smb_seq smbseq;
|
|
int ret;
|
|
u16 idx;
|
|
|
|
/* Initialize SMBus sequence fields */
|
|
smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
|
|
smbseq.data = (u8 *)&eeseq;
|
|
|
|
/* Send data byte-by-byte, checking if it is successfully written */
|
|
for (idx = 0; idx < len; idx++, memaddr++) {
|
|
/* Lock IDT SMBus device */
|
|
mutex_lock(&pdev->smb_mtx);
|
|
|
|
/* Perform write operation */
|
|
smbseq.bytecnt = EEPROM_WR_CNT;
|
|
eeseq.cmd = pdev->inieecmd | EEPROM_OP_WRITE;
|
|
eeseq.eeaddr = pdev->eeaddr;
|
|
eeseq.memaddr = cpu_to_le16(memaddr);
|
|
eeseq.data = data[idx];
|
|
ret = pdev->smb_write(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev,
|
|
"Failed to write 0x%04hx:0x%02hhx to eeprom",
|
|
memaddr, data[idx]);
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/*
|
|
* Check whether the data is successfully written by reading
|
|
* from the same EEPROM memory address.
|
|
*/
|
|
eeseq.data = ~data[idx];
|
|
ret = idt_eeprom_read_byte(pdev, memaddr, &eeseq.data);
|
|
if (ret != 0)
|
|
goto err_mutex_unlock;
|
|
|
|
/* Check whether the read byte is the same as written one */
|
|
if (eeseq.data != data[idx]) {
|
|
dev_err(dev, "Values don't match 0x%02hhx != 0x%02hhx",
|
|
eeseq.data, data[idx]);
|
|
ret = -EREMOTEIO;
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Unlock IDT SMBus device */
|
|
err_mutex_unlock:
|
|
mutex_unlock(&pdev->smb_mtx);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idt_eeprom_read() - EEPROM read operation
|
|
* @pdev: Pointer to the driver data
|
|
* @memaddr: Start EEPROM memory address
|
|
* @len: Length of data to read
|
|
* @buf: Buffer to read data to
|
|
*/
|
|
static int idt_eeprom_read(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
|
|
u8 *buf)
|
|
{
|
|
int ret;
|
|
u16 idx;
|
|
|
|
/* Read data byte-by-byte, retrying if it wasn't successful */
|
|
for (idx = 0; idx < len; idx++, memaddr++) {
|
|
/* Lock IDT SMBus device */
|
|
mutex_lock(&pdev->smb_mtx);
|
|
|
|
/* Just read the byte to the buffer */
|
|
ret = idt_eeprom_read_byte(pdev, memaddr, &buf[idx]);
|
|
|
|
/* Unlock IDT SMBus device */
|
|
mutex_unlock(&pdev->smb_mtx);
|
|
|
|
/* Return error if read operation failed */
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================
|
|
* CSR IO-operations
|
|
*===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* idt_csr_write() - CSR write operation
|
|
* @pdev: Pointer to the driver data
|
|
* @csraddr: CSR address (with no two LS bits)
|
|
* @data: Data to be written to CSR
|
|
*/
|
|
static int idt_csr_write(struct idt_89hpesx_dev *pdev, u16 csraddr,
|
|
const u32 data)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
struct idt_csr_seq csrseq;
|
|
struct idt_smb_seq smbseq;
|
|
int ret;
|
|
|
|
/* Initialize SMBus sequence fields */
|
|
smbseq.ccode = pdev->iniccode | CCODE_CSR;
|
|
smbseq.data = (u8 *)&csrseq;
|
|
|
|
/* Lock IDT SMBus device */
|
|
mutex_lock(&pdev->smb_mtx);
|
|
|
|
/* Perform write operation */
|
|
smbseq.bytecnt = CSR_WR_CNT;
|
|
csrseq.cmd = pdev->inicsrcmd | CSR_OP_WRITE;
|
|
csrseq.csraddr = cpu_to_le16(csraddr);
|
|
csrseq.data = cpu_to_le32(data);
|
|
ret = pdev->smb_write(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to write 0x%04x: 0x%04x to csr",
|
|
CSR_REAL_ADDR(csraddr), data);
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Send CSR address to read data from */
|
|
smbseq.bytecnt = CSR_WRRD_CNT;
|
|
csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
|
|
ret = pdev->smb_write(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to init csr address 0x%04x",
|
|
CSR_REAL_ADDR(csraddr));
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Perform read operation */
|
|
smbseq.bytecnt = CSR_RD_CNT;
|
|
ret = pdev->smb_read(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to read csr 0x%04x",
|
|
CSR_REAL_ADDR(csraddr));
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Check whether IDT successfully retrieved CSR data */
|
|
if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
|
|
dev_err(dev, "IDT failed to perform CSR r/w");
|
|
ret = -EREMOTEIO;
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Unlock IDT SMBus device */
|
|
err_mutex_unlock:
|
|
mutex_unlock(&pdev->smb_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* idt_csr_read() - CSR read operation
|
|
* @pdev: Pointer to the driver data
|
|
* @csraddr: CSR address (with no two LS bits)
|
|
* @data: Data to be written to CSR
|
|
*/
|
|
static int idt_csr_read(struct idt_89hpesx_dev *pdev, u16 csraddr, u32 *data)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
struct idt_csr_seq csrseq;
|
|
struct idt_smb_seq smbseq;
|
|
int ret;
|
|
|
|
/* Initialize SMBus sequence fields */
|
|
smbseq.ccode = pdev->iniccode | CCODE_CSR;
|
|
smbseq.data = (u8 *)&csrseq;
|
|
|
|
/* Lock IDT SMBus device */
|
|
mutex_lock(&pdev->smb_mtx);
|
|
|
|
/* Send CSR register address before reading it */
|
|
smbseq.bytecnt = CSR_WRRD_CNT;
|
|
csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
|
|
csrseq.csraddr = cpu_to_le16(csraddr);
|
|
ret = pdev->smb_write(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to init csr address 0x%04x",
|
|
CSR_REAL_ADDR(csraddr));
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Perform read operation */
|
|
smbseq.bytecnt = CSR_RD_CNT;
|
|
ret = pdev->smb_read(pdev, &smbseq);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to read csr 0x%04hx",
|
|
CSR_REAL_ADDR(csraddr));
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Check whether IDT successfully retrieved CSR data */
|
|
if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
|
|
dev_err(dev, "IDT failed to perform CSR r/w");
|
|
ret = -EREMOTEIO;
|
|
goto err_mutex_unlock;
|
|
}
|
|
|
|
/* Save data retrieved from IDT */
|
|
*data = le32_to_cpu(csrseq.data);
|
|
|
|
/* Unlock IDT SMBus device */
|
|
err_mutex_unlock:
|
|
mutex_unlock(&pdev->smb_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*===========================================================================
|
|
* Sysfs/debugfs-nodes IO-operations
|
|
*===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* eeprom_write() - EEPROM sysfs-node write callback
|
|
* @filep: Pointer to the file system node
|
|
* @kobj: Pointer to the kernel object related to the sysfs-node
|
|
* @attr: Attributes of the file
|
|
* @buf: Buffer to write data to
|
|
* @off: Offset at which data should be written to
|
|
* @count: Number of bytes to write
|
|
*/
|
|
static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct idt_89hpesx_dev *pdev;
|
|
int ret;
|
|
|
|
/* Retrieve driver data */
|
|
pdev = dev_get_drvdata(kobj_to_dev(kobj));
|
|
|
|
/* Perform EEPROM write operation */
|
|
ret = idt_eeprom_write(pdev, (u16)off, (u16)count, (u8 *)buf);
|
|
return (ret != 0 ? ret : count);
|
|
}
|
|
|
|
/*
|
|
* eeprom_read() - EEPROM sysfs-node read callback
|
|
* @filep: Pointer to the file system node
|
|
* @kobj: Pointer to the kernel object related to the sysfs-node
|
|
* @attr: Attributes of the file
|
|
* @buf: Buffer to write data to
|
|
* @off: Offset at which data should be written to
|
|
* @count: Number of bytes to write
|
|
*/
|
|
static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct idt_89hpesx_dev *pdev;
|
|
int ret;
|
|
|
|
/* Retrieve driver data */
|
|
pdev = dev_get_drvdata(kobj_to_dev(kobj));
|
|
|
|
/* Perform EEPROM read operation */
|
|
ret = idt_eeprom_read(pdev, (u16)off, (u16)count, (u8 *)buf);
|
|
return (ret != 0 ? ret : count);
|
|
}
|
|
|
|
/*
|
|
* idt_dbgfs_csr_write() - CSR debugfs-node write callback
|
|
* @filep: Pointer to the file system file descriptor
|
|
* @buf: Buffer to read data from
|
|
* @count: Size of the buffer
|
|
* @offp: Offset within the file
|
|
*
|
|
* It accepts either "0x<reg addr>:0x<value>" for saving register address
|
|
* and writing value to specified DWORD register or "0x<reg addr>" for
|
|
* just saving register address in order to perform next read operation.
|
|
*
|
|
* WARNING No spaces are allowed. Incoming string must be strictly formated as:
|
|
* "<reg addr>:<value>". Register address must be aligned within 4 bytes
|
|
* (one DWORD).
|
|
*/
|
|
static ssize_t idt_dbgfs_csr_write(struct file *filep, const char __user *ubuf,
|
|
size_t count, loff_t *offp)
|
|
{
|
|
struct idt_89hpesx_dev *pdev = filep->private_data;
|
|
char *colon_ch, *csraddr_str, *csrval_str;
|
|
int ret, csraddr_len, csrval_len;
|
|
u32 csraddr, csrval;
|
|
char *buf;
|
|
|
|
/* Copy data from User-space */
|
|
buf = kmalloc(count + 1, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ret = simple_write_to_buffer(buf, count, offp, ubuf, count);
|
|
if (ret < 0)
|
|
goto free_buf;
|
|
buf[count] = 0;
|
|
|
|
/* Find position of colon in the buffer */
|
|
colon_ch = strnchr(buf, count, ':');
|
|
|
|
/*
|
|
* If there is colon passed then new CSR value should be parsed as
|
|
* well, so allocate buffer for CSR address substring.
|
|
* If no colon is found, then string must have just one number with
|
|
* no new CSR value
|
|
*/
|
|
if (colon_ch != NULL) {
|
|
csraddr_len = colon_ch - buf;
|
|
csraddr_str =
|
|
kmalloc(sizeof(char)*(csraddr_len + 1), GFP_KERNEL);
|
|
if (csraddr_str == NULL) {
|
|
ret = -ENOMEM;
|
|
goto free_buf;
|
|
}
|
|
/* Copy the register address to the substring buffer */
|
|
strncpy(csraddr_str, buf, csraddr_len);
|
|
csraddr_str[csraddr_len] = '\0';
|
|
/* Register value must follow the colon */
|
|
csrval_str = colon_ch + 1;
|
|
csrval_len = strnlen(csrval_str, count - csraddr_len);
|
|
} else /* if (str_colon == NULL) */ {
|
|
csraddr_str = (char *)buf; /* Just to shut warning up */
|
|
csraddr_len = strnlen(csraddr_str, count);
|
|
csrval_str = NULL;
|
|
csrval_len = 0;
|
|
}
|
|
|
|
/* Convert CSR address to u32 value */
|
|
ret = kstrtou32(csraddr_str, 0, &csraddr);
|
|
if (ret != 0)
|
|
goto free_csraddr_str;
|
|
|
|
/* Check whether passed register address is valid */
|
|
if (csraddr > CSR_MAX || !IS_ALIGNED(csraddr, SZ_4)) {
|
|
ret = -EINVAL;
|
|
goto free_csraddr_str;
|
|
}
|
|
|
|
/* Shift register address to the right so to have u16 address */
|
|
pdev->csr = (csraddr >> 2);
|
|
|
|
/* Parse new CSR value and send it to IDT, if colon has been found */
|
|
if (colon_ch != NULL) {
|
|
ret = kstrtou32(csrval_str, 0, &csrval);
|
|
if (ret != 0)
|
|
goto free_csraddr_str;
|
|
|
|
ret = idt_csr_write(pdev, pdev->csr, csrval);
|
|
if (ret != 0)
|
|
goto free_csraddr_str;
|
|
}
|
|
|
|
/* Free memory only if colon has been found */
|
|
free_csraddr_str:
|
|
if (colon_ch != NULL)
|
|
kfree(csraddr_str);
|
|
|
|
/* Free buffer allocated for data retrieved from User-space */
|
|
free_buf:
|
|
kfree(buf);
|
|
|
|
return (ret != 0 ? ret : count);
|
|
}
|
|
|
|
/*
|
|
* idt_dbgfs_csr_read() - CSR debugfs-node read callback
|
|
* @filep: Pointer to the file system file descriptor
|
|
* @buf: Buffer to write data to
|
|
* @count: Size of the buffer
|
|
* @offp: Offset within the file
|
|
*
|
|
* It just prints the pair "0x<reg addr>:0x<value>" to passed buffer.
|
|
*/
|
|
#define CSRBUF_SIZE ((size_t)32)
|
|
static ssize_t idt_dbgfs_csr_read(struct file *filep, char __user *ubuf,
|
|
size_t count, loff_t *offp)
|
|
{
|
|
struct idt_89hpesx_dev *pdev = filep->private_data;
|
|
u32 csraddr, csrval;
|
|
char buf[CSRBUF_SIZE];
|
|
int ret, size;
|
|
|
|
/* Perform CSR read operation */
|
|
ret = idt_csr_read(pdev, pdev->csr, &csrval);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
/* Shift register address to the left so to have real address */
|
|
csraddr = ((u32)pdev->csr << 2);
|
|
|
|
/* Print the "0x<reg addr>:0x<value>" to buffer */
|
|
size = snprintf(buf, CSRBUF_SIZE, "0x%05x:0x%08x\n",
|
|
(unsigned int)csraddr, (unsigned int)csrval);
|
|
|
|
/* Copy data to User-space */
|
|
return simple_read_from_buffer(ubuf, count, offp, buf, size);
|
|
}
|
|
|
|
/*
|
|
* eeprom_attribute - EEPROM sysfs-node attributes
|
|
*
|
|
* NOTE Size will be changed in compliance with OF node. EEPROM attribute will
|
|
* be read-only as well if the corresponding flag is specified in OF node.
|
|
*/
|
|
static BIN_ATTR_RW(eeprom, EEPROM_DEF_SIZE);
|
|
|
|
/*
|
|
* csr_dbgfs_ops - CSR debugfs-node read/write operations
|
|
*/
|
|
static const struct file_operations csr_dbgfs_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = simple_open,
|
|
.write = idt_dbgfs_csr_write,
|
|
.read = idt_dbgfs_csr_read
|
|
};
|
|
|
|
/*===========================================================================
|
|
* Driver init/deinit methods
|
|
*===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* idt_set_defval() - disable EEPROM access by default
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
static void idt_set_defval(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
/* If OF info is missing then use next values */
|
|
pdev->eesize = 0;
|
|
pdev->eero = true;
|
|
pdev->inieecmd = 0;
|
|
pdev->eeaddr = 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct i2c_device_id ee_ids[];
|
|
/*
|
|
* idt_ee_match_id() - check whether the node belongs to compatible EEPROMs
|
|
*/
|
|
static const struct i2c_device_id *idt_ee_match_id(struct device_node *node)
|
|
{
|
|
const struct i2c_device_id *id = ee_ids;
|
|
char devname[I2C_NAME_SIZE];
|
|
|
|
/* Retrieve the device name without manufacturer name */
|
|
if (of_modalias_node(node, devname, sizeof(devname)))
|
|
return NULL;
|
|
|
|
/* Search through the device name */
|
|
while (id->name[0]) {
|
|
if (strcmp(devname, id->name) == 0)
|
|
return id;
|
|
id++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* idt_get_ofdata() - get IDT i2c-device parameters from device tree
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
static void idt_get_ofdata(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
const struct device_node *node = pdev->client->dev.of_node;
|
|
struct device *dev = &pdev->client->dev;
|
|
|
|
/* Read dts node parameters */
|
|
if (node) {
|
|
const struct i2c_device_id *ee_id = NULL;
|
|
struct device_node *child;
|
|
const __be32 *addr_be;
|
|
int len;
|
|
|
|
/* Walk through all child nodes looking for compatible one */
|
|
for_each_available_child_of_node(node, child) {
|
|
ee_id = idt_ee_match_id(child);
|
|
if (IS_ERR_OR_NULL(ee_id)) {
|
|
dev_warn(dev, "Skip unsupported child node %s",
|
|
child->full_name);
|
|
continue;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/* If there is no child EEPROM device, then set zero size */
|
|
if (!ee_id) {
|
|
idt_set_defval(pdev);
|
|
return;
|
|
}
|
|
|
|
/* Retrieve EEPROM size */
|
|
pdev->eesize = (u32)ee_id->driver_data;
|
|
|
|
/* Get custom EEPROM address from 'reg' attribute */
|
|
addr_be = of_get_property(child, "reg", &len);
|
|
if (!addr_be || (len < sizeof(*addr_be))) {
|
|
dev_warn(dev, "No reg on %s, use default address %d",
|
|
child->full_name, EEPROM_DEF_ADDR);
|
|
pdev->inieecmd = 0;
|
|
pdev->eeaddr = EEPROM_DEF_ADDR << 1;
|
|
} else {
|
|
pdev->inieecmd = EEPROM_USA;
|
|
pdev->eeaddr = be32_to_cpup(addr_be) << 1;
|
|
}
|
|
|
|
/* Check EEPROM 'read-only' flag */
|
|
if (of_get_property(child, "read-only", NULL))
|
|
pdev->eero = true;
|
|
else /* if (!of_get_property(node, "read-only", NULL)) */
|
|
pdev->eero = false;
|
|
|
|
dev_dbg(dev, "EEPROM of %u bytes found by %hhu",
|
|
pdev->eesize, pdev->eeaddr);
|
|
} else {
|
|
dev_warn(dev, "No dts node, EEPROM access disabled");
|
|
idt_set_defval(pdev);
|
|
}
|
|
}
|
|
#else
|
|
static void idt_get_ofdata(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
|
|
dev_warn(dev, "OF table is unsupported, EEPROM access disabled");
|
|
|
|
/* Nothing we can do, just set the default values */
|
|
idt_set_defval(pdev);
|
|
}
|
|
#endif /* CONFIG_OF */
|
|
|
|
/*
|
|
* idt_create_pdev() - create and init data structure of the driver
|
|
* @client: i2c client of IDT PCIe-switch device
|
|
*/
|
|
static struct idt_89hpesx_dev *idt_create_pdev(struct i2c_client *client)
|
|
{
|
|
struct idt_89hpesx_dev *pdev;
|
|
|
|
/* Allocate memory for driver data */
|
|
pdev = devm_kmalloc(&client->dev, sizeof(struct idt_89hpesx_dev),
|
|
GFP_KERNEL);
|
|
if (pdev == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Initialize basic fields of the data */
|
|
pdev->client = client;
|
|
i2c_set_clientdata(client, pdev);
|
|
|
|
/* Read OF nodes information */
|
|
idt_get_ofdata(pdev);
|
|
|
|
/* Initialize basic CSR CMD field - use full DWORD-sized r/w ops */
|
|
pdev->inicsrcmd = CSR_DWE;
|
|
pdev->csr = CSR_DEF;
|
|
|
|
/* Enable Packet Error Checking if it's supported by adapter */
|
|
if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC)) {
|
|
pdev->iniccode = CCODE_PEC;
|
|
client->flags |= I2C_CLIENT_PEC;
|
|
} else /* PEC is unsupported */ {
|
|
pdev->iniccode = 0;
|
|
}
|
|
|
|
return pdev;
|
|
}
|
|
|
|
/*
|
|
* idt_free_pdev() - free data structure of the driver
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
static void idt_free_pdev(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
/* Clear driver data from device private field */
|
|
i2c_set_clientdata(pdev->client, NULL);
|
|
}
|
|
|
|
/*
|
|
* idt_set_smbus_ops() - set supported SMBus operations
|
|
* @pdev: Pointer to the driver data
|
|
* Return status of smbus check operations
|
|
*/
|
|
static int idt_set_smbus_ops(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct i2c_adapter *adapter = pdev->client->adapter;
|
|
struct device *dev = &pdev->client->dev;
|
|
|
|
/* Check i2c adapter read functionality */
|
|
if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
|
|
pdev->smb_read = idt_smb_read_block;
|
|
dev_dbg(dev, "SMBus block-read op chosen");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
|
|
pdev->smb_read = idt_smb_read_i2c_block;
|
|
dev_dbg(dev, "SMBus i2c-block-read op chosen");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_READ_WORD_DATA) &&
|
|
i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
|
|
pdev->smb_read = idt_smb_read_word;
|
|
dev_warn(dev, "Use slow word/byte SMBus read ops");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
|
|
pdev->smb_read = idt_smb_read_byte;
|
|
dev_warn(dev, "Use slow byte SMBus read op");
|
|
} else /* no supported smbus read operations */ {
|
|
dev_err(dev, "No supported SMBus read op");
|
|
return -EPFNOSUPPORT;
|
|
}
|
|
|
|
/* Check i2c adapter write functionality */
|
|
if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) {
|
|
pdev->smb_write = idt_smb_write_block;
|
|
dev_dbg(dev, "SMBus block-write op chosen");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
|
|
pdev->smb_write = idt_smb_write_i2c_block;
|
|
dev_dbg(dev, "SMBus i2c-block-write op chosen");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_WRITE_WORD_DATA) &&
|
|
i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
|
|
pdev->smb_write = idt_smb_write_word;
|
|
dev_warn(dev, "Use slow word/byte SMBus write op");
|
|
} else if (i2c_check_functionality(adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
|
|
pdev->smb_write = idt_smb_write_byte;
|
|
dev_warn(dev, "Use slow byte SMBus write op");
|
|
} else /* no supported smbus write operations */ {
|
|
dev_err(dev, "No supported SMBus write op");
|
|
return -EPFNOSUPPORT;
|
|
}
|
|
|
|
/* Initialize IDT SMBus slave interface mutex */
|
|
mutex_init(&pdev->smb_mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idt_check_dev() - check whether it's really IDT 89HPESx device
|
|
* @pdev: Pointer to the driver data
|
|
* Return status of i2c adapter check operation
|
|
*/
|
|
static int idt_check_dev(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
u32 viddid;
|
|
int ret;
|
|
|
|
/* Read VID and DID directly from IDT memory space */
|
|
ret = idt_csr_read(pdev, IDT_VIDDID_CSR, &viddid);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to read VID/DID");
|
|
return ret;
|
|
}
|
|
|
|
/* Check whether it's IDT device */
|
|
if ((viddid & IDT_VID_MASK) != PCI_VENDOR_ID_IDT) {
|
|
dev_err(dev, "Got unsupported VID/DID: 0x%08x", viddid);
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev_info(dev, "Found IDT 89HPES device VID:0x%04x, DID:0x%04x",
|
|
(viddid & IDT_VID_MASK), (viddid >> 16));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idt_create_sysfs_files() - create sysfs attribute files
|
|
* @pdev: Pointer to the driver data
|
|
* Return status of operation
|
|
*/
|
|
static int idt_create_sysfs_files(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
int ret;
|
|
|
|
/* Don't do anything if EEPROM isn't accessible */
|
|
if (pdev->eesize == 0) {
|
|
dev_dbg(dev, "Skip creating sysfs-files");
|
|
return 0;
|
|
}
|
|
|
|
/* Allocate memory for attribute file */
|
|
pdev->ee_file = devm_kmalloc(dev, sizeof(*pdev->ee_file), GFP_KERNEL);
|
|
if (!pdev->ee_file)
|
|
return -ENOMEM;
|
|
|
|
/* Copy the declared EEPROM attr structure to change some of fields */
|
|
memcpy(pdev->ee_file, &bin_attr_eeprom, sizeof(*pdev->ee_file));
|
|
|
|
/* In case of read-only EEPROM get rid of write ability */
|
|
if (pdev->eero) {
|
|
pdev->ee_file->attr.mode &= ~0200;
|
|
pdev->ee_file->write = NULL;
|
|
}
|
|
/* Create EEPROM sysfs file */
|
|
pdev->ee_file->size = pdev->eesize;
|
|
ret = sysfs_create_bin_file(&dev->kobj, pdev->ee_file);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to create EEPROM sysfs-node");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idt_remove_sysfs_files() - remove sysfs attribute files
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
static void idt_remove_sysfs_files(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->client->dev;
|
|
|
|
/* Don't do anything if EEPROM wasn't accessible */
|
|
if (pdev->eesize == 0)
|
|
return;
|
|
|
|
/* Remove EEPROM sysfs file */
|
|
sysfs_remove_bin_file(&dev->kobj, pdev->ee_file);
|
|
}
|
|
|
|
/*
|
|
* idt_create_dbgfs_files() - create debugfs files
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
#define CSRNAME_LEN ((size_t)32)
|
|
static void idt_create_dbgfs_files(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
struct i2c_client *cli = pdev->client;
|
|
char fname[CSRNAME_LEN];
|
|
|
|
/* Create Debugfs directory for CSR file */
|
|
snprintf(fname, CSRNAME_LEN, "%d-%04hx", cli->adapter->nr, cli->addr);
|
|
pdev->csr_dir = debugfs_create_dir(fname, csr_dbgdir);
|
|
|
|
/* Create Debugfs file for CSR read/write operations */
|
|
pdev->csr_file = debugfs_create_file(cli->name, 0600,
|
|
pdev->csr_dir, pdev, &csr_dbgfs_ops);
|
|
}
|
|
|
|
/*
|
|
* idt_remove_dbgfs_files() - remove debugfs files
|
|
* @pdev: Pointer to the driver data
|
|
*/
|
|
static void idt_remove_dbgfs_files(struct idt_89hpesx_dev *pdev)
|
|
{
|
|
/* Remove CSR directory and it sysfs-node */
|
|
debugfs_remove_recursive(pdev->csr_dir);
|
|
}
|
|
|
|
/*
|
|
* idt_probe() - IDT 89HPESx driver probe() callback method
|
|
*/
|
|
static int idt_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
|
{
|
|
struct idt_89hpesx_dev *pdev;
|
|
int ret;
|
|
|
|
/* Create driver data */
|
|
pdev = idt_create_pdev(client);
|
|
if (IS_ERR(pdev))
|
|
return PTR_ERR(pdev);
|
|
|
|
/* Set SMBus operations */
|
|
ret = idt_set_smbus_ops(pdev);
|
|
if (ret != 0)
|
|
goto err_free_pdev;
|
|
|
|
/* Check whether it is truly IDT 89HPESx device */
|
|
ret = idt_check_dev(pdev);
|
|
if (ret != 0)
|
|
goto err_free_pdev;
|
|
|
|
/* Create sysfs files */
|
|
ret = idt_create_sysfs_files(pdev);
|
|
if (ret != 0)
|
|
goto err_free_pdev;
|
|
|
|
/* Create debugfs files */
|
|
idt_create_dbgfs_files(pdev);
|
|
|
|
return 0;
|
|
|
|
err_free_pdev:
|
|
idt_free_pdev(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* idt_remove() - IDT 89HPESx driver remove() callback method
|
|
*/
|
|
static int idt_remove(struct i2c_client *client)
|
|
{
|
|
struct idt_89hpesx_dev *pdev = i2c_get_clientdata(client);
|
|
|
|
/* Remove debugfs files first */
|
|
idt_remove_dbgfs_files(pdev);
|
|
|
|
/* Remove sysfs files */
|
|
idt_remove_sysfs_files(pdev);
|
|
|
|
/* Discard driver data structure */
|
|
idt_free_pdev(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ee_ids - array of supported EEPROMs
|
|
*/
|
|
static const struct i2c_device_id ee_ids[] = {
|
|
{ "24c32", 4096},
|
|
{ "24c64", 8192},
|
|
{ "24c128", 16384},
|
|
{ "24c256", 32768},
|
|
{ "24c512", 65536},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ee_ids);
|
|
|
|
/*
|
|
* idt_ids - supported IDT 89HPESx devices
|
|
*/
|
|
static const struct i2c_device_id idt_ids[] = {
|
|
{ "89hpes8nt2", 0 },
|
|
{ "89hpes12nt3", 0 },
|
|
|
|
{ "89hpes24nt6ag2", 0 },
|
|
{ "89hpes32nt8ag2", 0 },
|
|
{ "89hpes32nt8bg2", 0 },
|
|
{ "89hpes12nt12g2", 0 },
|
|
{ "89hpes16nt16g2", 0 },
|
|
{ "89hpes24nt24g2", 0 },
|
|
{ "89hpes32nt24ag2", 0 },
|
|
{ "89hpes32nt24bg2", 0 },
|
|
|
|
{ "89hpes12n3", 0 },
|
|
{ "89hpes12n3a", 0 },
|
|
{ "89hpes24n3", 0 },
|
|
{ "89hpes24n3a", 0 },
|
|
|
|
{ "89hpes32h8", 0 },
|
|
{ "89hpes32h8g2", 0 },
|
|
{ "89hpes48h12", 0 },
|
|
{ "89hpes48h12g2", 0 },
|
|
{ "89hpes48h12ag2", 0 },
|
|
{ "89hpes16h16", 0 },
|
|
{ "89hpes22h16", 0 },
|
|
{ "89hpes22h16g2", 0 },
|
|
{ "89hpes34h16", 0 },
|
|
{ "89hpes34h16g2", 0 },
|
|
{ "89hpes64h16", 0 },
|
|
{ "89hpes64h16g2", 0 },
|
|
{ "89hpes64h16ag2", 0 },
|
|
|
|
/* { "89hpes3t3", 0 }, // No SMBus-slave iface */
|
|
{ "89hpes12t3g2", 0 },
|
|
{ "89hpes24t3g2", 0 },
|
|
/* { "89hpes4t4", 0 }, // No SMBus-slave iface */
|
|
{ "89hpes16t4", 0 },
|
|
{ "89hpes4t4g2", 0 },
|
|
{ "89hpes10t4g2", 0 },
|
|
{ "89hpes16t4g2", 0 },
|
|
{ "89hpes16t4ag2", 0 },
|
|
{ "89hpes5t5", 0 },
|
|
{ "89hpes6t5", 0 },
|
|
{ "89hpes8t5", 0 },
|
|
{ "89hpes8t5a", 0 },
|
|
{ "89hpes24t6", 0 },
|
|
{ "89hpes6t6g2", 0 },
|
|
{ "89hpes24t6g2", 0 },
|
|
{ "89hpes16t7", 0 },
|
|
{ "89hpes32t8", 0 },
|
|
{ "89hpes32t8g2", 0 },
|
|
{ "89hpes48t12", 0 },
|
|
{ "89hpes48t12g2", 0 },
|
|
{ /* END OF LIST */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, idt_ids);
|
|
|
|
static const struct of_device_id idt_of_match[] = {
|
|
{ .compatible = "idt,89hpes8nt2", },
|
|
{ .compatible = "idt,89hpes12nt3", },
|
|
|
|
{ .compatible = "idt,89hpes24nt6ag2", },
|
|
{ .compatible = "idt,89hpes32nt8ag2", },
|
|
{ .compatible = "idt,89hpes32nt8bg2", },
|
|
{ .compatible = "idt,89hpes12nt12g2", },
|
|
{ .compatible = "idt,89hpes16nt16g2", },
|
|
{ .compatible = "idt,89hpes24nt24g2", },
|
|
{ .compatible = "idt,89hpes32nt24ag2", },
|
|
{ .compatible = "idt,89hpes32nt24bg2", },
|
|
|
|
{ .compatible = "idt,89hpes12n3", },
|
|
{ .compatible = "idt,89hpes12n3a", },
|
|
{ .compatible = "idt,89hpes24n3", },
|
|
{ .compatible = "idt,89hpes24n3a", },
|
|
|
|
{ .compatible = "idt,89hpes32h8", },
|
|
{ .compatible = "idt,89hpes32h8g2", },
|
|
{ .compatible = "idt,89hpes48h12", },
|
|
{ .compatible = "idt,89hpes48h12g2", },
|
|
{ .compatible = "idt,89hpes48h12ag2", },
|
|
{ .compatible = "idt,89hpes16h16", },
|
|
{ .compatible = "idt,89hpes22h16", },
|
|
{ .compatible = "idt,89hpes22h16g2", },
|
|
{ .compatible = "idt,89hpes34h16", },
|
|
{ .compatible = "idt,89hpes34h16g2", },
|
|
{ .compatible = "idt,89hpes64h16", },
|
|
{ .compatible = "idt,89hpes64h16g2", },
|
|
{ .compatible = "idt,89hpes64h16ag2", },
|
|
|
|
{ .compatible = "idt,89hpes12t3g2", },
|
|
{ .compatible = "idt,89hpes24t3g2", },
|
|
|
|
{ .compatible = "idt,89hpes16t4", },
|
|
{ .compatible = "idt,89hpes4t4g2", },
|
|
{ .compatible = "idt,89hpes10t4g2", },
|
|
{ .compatible = "idt,89hpes16t4g2", },
|
|
{ .compatible = "idt,89hpes16t4ag2", },
|
|
{ .compatible = "idt,89hpes5t5", },
|
|
{ .compatible = "idt,89hpes6t5", },
|
|
{ .compatible = "idt,89hpes8t5", },
|
|
{ .compatible = "idt,89hpes8t5a", },
|
|
{ .compatible = "idt,89hpes24t6", },
|
|
{ .compatible = "idt,89hpes6t6g2", },
|
|
{ .compatible = "idt,89hpes24t6g2", },
|
|
{ .compatible = "idt,89hpes16t7", },
|
|
{ .compatible = "idt,89hpes32t8", },
|
|
{ .compatible = "idt,89hpes32t8g2", },
|
|
{ .compatible = "idt,89hpes48t12", },
|
|
{ .compatible = "idt,89hpes48t12g2", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, idt_of_match);
|
|
|
|
/*
|
|
* idt_driver - IDT 89HPESx driver structure
|
|
*/
|
|
static struct i2c_driver idt_driver = {
|
|
.driver = {
|
|
.name = IDT_NAME,
|
|
.of_match_table = idt_of_match,
|
|
},
|
|
.probe = idt_probe,
|
|
.remove = idt_remove,
|
|
.id_table = idt_ids,
|
|
};
|
|
|
|
/*
|
|
* idt_init() - IDT 89HPESx driver init() callback method
|
|
*/
|
|
static int __init idt_init(void)
|
|
{
|
|
/* Create Debugfs directory first */
|
|
if (debugfs_initialized())
|
|
csr_dbgdir = debugfs_create_dir("idt_csr", NULL);
|
|
|
|
/* Add new i2c-device driver */
|
|
return i2c_add_driver(&idt_driver);
|
|
}
|
|
module_init(idt_init);
|
|
|
|
/*
|
|
* idt_exit() - IDT 89HPESx driver exit() callback method
|
|
*/
|
|
static void __exit idt_exit(void)
|
|
{
|
|
/* Discard debugfs directory and all files if any */
|
|
debugfs_remove_recursive(csr_dbgdir);
|
|
|
|
/* Unregister i2c-device driver */
|
|
i2c_del_driver(&idt_driver);
|
|
}
|
|
module_exit(idt_exit);
|