![David Daney](/assets/img/avatar_default.png)
If I2C_M_RECV_LEN is set consider the length byte. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Jan Glauber <jglauber@cavium.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
601 lines
15 KiB
C
601 lines
15 KiB
C
/*
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* (C) Copyright 2009-2010
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* Nokia Siemens Networks, michael.lawnick.ext@nsn.com
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*
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* Portions Copyright (C) 2010 - 2016 Cavium, Inc.
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*
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* This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <asm/octeon/octeon.h>
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#define DRV_NAME "i2c-octeon"
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/* Register offsets */
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#define SW_TWSI 0x00
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#define TWSI_INT 0x10
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/* Controller command patterns */
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#define SW_TWSI_V BIT_ULL(63) /* Valid bit */
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#define SW_TWSI_R BIT_ULL(56) /* Result or read bit */
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/* Controller opcode word (bits 60:57) */
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#define SW_TWSI_OP_SHIFT 57
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#define SW_TWSI_OP_TWSI_CLK (4ULL << SW_TWSI_OP_SHIFT)
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#define SW_TWSI_OP_EOP (6ULL << SW_TWSI_OP_SHIFT) /* Extended opcode */
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/* Controller extended opcode word (bits 34:32) */
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#define SW_TWSI_EOP_SHIFT 32
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#define SW_TWSI_EOP_TWSI_DATA (SW_TWSI_OP_EOP | 1ULL << SW_TWSI_EOP_SHIFT)
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#define SW_TWSI_EOP_TWSI_CTL (SW_TWSI_OP_EOP | 2ULL << SW_TWSI_EOP_SHIFT)
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#define SW_TWSI_EOP_TWSI_CLKCTL (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
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#define SW_TWSI_EOP_TWSI_STAT (SW_TWSI_OP_EOP | 3ULL << SW_TWSI_EOP_SHIFT)
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#define SW_TWSI_EOP_TWSI_RST (SW_TWSI_OP_EOP | 7ULL << SW_TWSI_EOP_SHIFT)
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/* Controller command and status bits */
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#define TWSI_CTL_CE 0x80
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#define TWSI_CTL_ENAB 0x40 /* Bus enable */
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#define TWSI_CTL_STA 0x20 /* Master-mode start, HW clears when done */
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#define TWSI_CTL_STP 0x10 /* Master-mode stop, HW clears when done */
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#define TWSI_CTL_IFLG 0x08 /* HW event, SW writes 0 to ACK */
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#define TWSI_CTL_AAK 0x04 /* Assert ACK */
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/* Some status values */
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#define STAT_START 0x08
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#define STAT_RSTART 0x10
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#define STAT_TXADDR_ACK 0x18
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#define STAT_TXDATA_ACK 0x28
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#define STAT_RXADDR_ACK 0x40
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#define STAT_RXDATA_ACK 0x50
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#define STAT_IDLE 0xF8
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/* TWSI_INT values */
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#define TWSI_INT_CORE_EN BIT_ULL(6)
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#define TWSI_INT_SDA_OVR BIT_ULL(8)
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#define TWSI_INT_SCL_OVR BIT_ULL(9)
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struct octeon_i2c {
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wait_queue_head_t queue;
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struct i2c_adapter adap;
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int irq;
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u32 twsi_freq;
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int sys_freq;
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void __iomem *twsi_base;
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struct device *dev;
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};
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/**
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* octeon_i2c_write_sw - write an I2C core register
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* @i2c: The struct octeon_i2c
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* @eop_reg: Register selector
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* @data: Value to be written
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*
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* The I2C core registers are accessed indirectly via the SW_TWSI CSR.
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*/
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static void octeon_i2c_write_sw(struct octeon_i2c *i2c, u64 eop_reg, u8 data)
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{
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u64 tmp;
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__raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI);
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do {
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tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
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} while ((tmp & SW_TWSI_V) != 0);
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}
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/**
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* octeon_i2c_read_sw - read lower bits of an I2C core register
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* @i2c: The struct octeon_i2c
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* @eop_reg: Register selector
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*
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* Returns the data.
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*
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* The I2C core registers are accessed indirectly via the SW_TWSI CSR.
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*/
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static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
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{
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u64 tmp;
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__raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI);
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do {
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tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
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} while ((tmp & SW_TWSI_V) != 0);
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return tmp & 0xFF;
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}
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/**
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* octeon_i2c_write_int - write the TWSI_INT register
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* @i2c: The struct octeon_i2c
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* @data: Value to be written
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*/
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static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
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{
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__raw_writeq(data, i2c->twsi_base + TWSI_INT);
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__raw_readq(i2c->twsi_base + TWSI_INT);
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}
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/**
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* octeon_i2c_int_enable - enable the CORE interrupt
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* @i2c: The struct octeon_i2c
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*
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* The interrupt will be asserted when there is non-STAT_IDLE state in
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* the SW_TWSI_EOP_TWSI_STAT register.
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*/
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static void octeon_i2c_int_enable(struct octeon_i2c *i2c)
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{
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octeon_i2c_write_int(i2c, TWSI_INT_CORE_EN);
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}
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/* disable the CORE interrupt */
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static void octeon_i2c_int_disable(struct octeon_i2c *i2c)
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{
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/* clear TS/ST/IFLG events */
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octeon_i2c_write_int(i2c, 0);
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}
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/**
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* octeon_i2c_unblock - unblock the bus
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* @i2c: The struct octeon_i2c
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*
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* If there was a reset while a device was driving 0 to bus, bus is blocked.
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* We toggle it free manually by some clock cycles and send a stop.
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*/
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static void octeon_i2c_unblock(struct octeon_i2c *i2c)
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{
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int i;
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dev_dbg(i2c->dev, "%s\n", __func__);
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for (i = 0; i < 9; i++) {
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octeon_i2c_write_int(i2c, 0);
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udelay(5);
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octeon_i2c_write_int(i2c, TWSI_INT_SCL_OVR);
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udelay(5);
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}
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/* hand-crank a STOP */
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octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR | TWSI_INT_SCL_OVR);
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udelay(5);
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octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR);
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udelay(5);
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octeon_i2c_write_int(i2c, 0);
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}
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/* interrupt service routine */
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static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
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{
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struct octeon_i2c *i2c = dev_id;
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octeon_i2c_int_disable(i2c);
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wake_up(&i2c->queue);
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return IRQ_HANDLED;
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}
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static int octeon_i2c_test_iflg(struct octeon_i2c *i2c)
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{
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return (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0;
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}
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/**
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* octeon_i2c_wait - wait for the IFLG to be set
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* @i2c: The struct octeon_i2c
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_wait(struct octeon_i2c *i2c)
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{
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long time_left;
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octeon_i2c_int_enable(i2c);
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time_left = wait_event_timeout(i2c->queue, octeon_i2c_test_iflg(i2c),
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i2c->adap.timeout);
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octeon_i2c_int_disable(i2c);
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if (!time_left) {
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dev_dbg(i2c->dev, "%s: timeout\n", __func__);
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return -ETIMEDOUT;
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}
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return 0;
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}
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/**
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* octeon_i2c_start - send START to the bus
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* @i2c: The struct octeon_i2c
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_start(struct octeon_i2c *i2c)
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{
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int result;
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u8 data;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STA);
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result = octeon_i2c_wait(i2c);
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if (result) {
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if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
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/*
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* Controller refused to send start flag May
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* be a client is holding SDA low - let's try
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* to free it.
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*/
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octeon_i2c_unblock(i2c);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STA);
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result = octeon_i2c_wait(i2c);
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}
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if (result)
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return result;
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}
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data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((data != STAT_START) && (data != STAT_RSTART)) {
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dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
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return -EIO;
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}
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return 0;
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}
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/* send STOP to the bus */
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static void octeon_i2c_stop(struct octeon_i2c *i2c)
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{
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STP);
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}
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/**
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* octeon_i2c_write - send data to the bus via low-level controller
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* @i2c: The struct octeon_i2c
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* @target: Target address
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* @data: Pointer to the data to be sent
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* @length: Length of the data
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*
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* The address is sent over the bus, then the data.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
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const u8 *data, int length)
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{
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int i, result;
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u8 tmp;
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result = octeon_i2c_start(i2c);
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if (result)
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return result;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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for (i = 0; i < length; i++) {
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tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
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dev_err(i2c->dev,
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"%s: bad status before write (0x%x)\n",
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__func__, tmp);
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return -EIO;
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}
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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}
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return 0;
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}
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/**
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* octeon_i2c_read - receive data from the bus via low-level controller
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* @i2c: The struct octeon_i2c
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* @target: Target address
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* @data: Pointer to the location to store the data
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* @rlength: Length of the data
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* @recv_len: flag for length byte
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*
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* The address is sent over the bus, then the data is read.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
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u8 *data, u16 *rlength, bool recv_len)
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{
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int i, result, length = *rlength;
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u8 tmp;
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if (length < 1)
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return -EINVAL;
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result = octeon_i2c_start(i2c);
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if (result)
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return result;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target << 1) | 1);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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for (i = 0; i < length; i++) {
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tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
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dev_err(i2c->dev,
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"%s: bad status before read (0x%x)\n",
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__func__, tmp);
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return -EIO;
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}
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if (i + 1 < length)
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_AAK);
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else
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
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if (recv_len && i == 0) {
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if (data[i] > I2C_SMBUS_BLOCK_MAX + 1) {
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dev_err(i2c->dev,
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"%s: read len > I2C_SMBUS_BLOCK_MAX %d\n",
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__func__, data[i]);
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return -EPROTO;
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}
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length += data[i];
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}
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}
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*rlength = length;
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return 0;
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}
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/**
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* octeon_i2c_xfer - The driver's master_xfer function
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* @adap: Pointer to the i2c_adapter structure
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* @msgs: Pointer to the messages to be processed
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* @num: Length of the MSGS array
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*
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* Returns the number of messages processed, or a negative errno on failure.
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*/
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static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
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int num)
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{
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struct octeon_i2c *i2c = i2c_get_adapdata(adap);
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int i, ret = 0;
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for (i = 0; ret == 0 && i < num; i++) {
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struct i2c_msg *pmsg = &msgs[i];
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dev_dbg(i2c->dev,
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"Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n",
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pmsg->flags & I2C_M_RD ? "read" : "write",
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pmsg->len, pmsg->addr, i + 1, num);
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if (pmsg->flags & I2C_M_RD)
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ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
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&pmsg->len, pmsg->flags & I2C_M_RECV_LEN);
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else
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ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
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pmsg->len);
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}
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octeon_i2c_stop(i2c);
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return (ret != 0) ? ret : num;
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}
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static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL;
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}
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static const struct i2c_algorithm octeon_i2c_algo = {
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.master_xfer = octeon_i2c_xfer,
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.functionality = octeon_i2c_functionality,
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};
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static struct i2c_adapter octeon_i2c_ops = {
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.owner = THIS_MODULE,
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.name = "OCTEON adapter",
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.algo = &octeon_i2c_algo,
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.timeout = HZ / 50,
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};
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/* calculate and set clock divisors */
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static void octeon_i2c_set_clock(struct octeon_i2c *i2c)
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{
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int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
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int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
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for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
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/*
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* An mdiv value of less than 2 seems to not work well
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* with ds1337 RTCs, so we constrain it to larger values.
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*/
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for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) {
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/*
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* For given ndiv and mdiv values check the
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* two closest thp values.
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*/
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tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
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tclk *= (1 << ndiv_idx);
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thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
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for (inc = 0; inc <= 1; inc++) {
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thp_idx = thp_base + inc;
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if (thp_idx < 5 || thp_idx > 0xff)
|
|
continue;
|
|
|
|
foscl = i2c->sys_freq / (2 * (thp_idx + 1));
|
|
foscl = foscl / (1 << ndiv_idx);
|
|
foscl = foscl / (mdiv_idx + 1) / 10;
|
|
diff = abs(foscl - i2c->twsi_freq);
|
|
if (diff < delta_hz) {
|
|
delta_hz = diff;
|
|
thp = thp_idx;
|
|
mdiv = mdiv_idx;
|
|
ndiv = ndiv_idx;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp);
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
|
|
}
|
|
|
|
static int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c)
|
|
{
|
|
u8 status;
|
|
int tries;
|
|
|
|
/* disable high level controller, enable bus access */
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
|
|
|
|
/* reset controller */
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0);
|
|
|
|
for (tries = 10; tries; tries--) {
|
|
udelay(1);
|
|
status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
|
|
if (status == STAT_IDLE)
|
|
return 0;
|
|
}
|
|
dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status);
|
|
return -EIO;
|
|
}
|
|
|
|
static int octeon_i2c_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct resource *res_mem;
|
|
struct octeon_i2c *i2c;
|
|
int irq, result = 0;
|
|
|
|
/* All adaptors have an irq. */
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
|
|
if (!i2c) {
|
|
result = -ENOMEM;
|
|
goto out;
|
|
}
|
|
i2c->dev = &pdev->dev;
|
|
|
|
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
i2c->twsi_base = devm_ioremap_resource(&pdev->dev, res_mem);
|
|
if (IS_ERR(i2c->twsi_base)) {
|
|
result = PTR_ERR(i2c->twsi_base);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* "clock-rate" is a legacy binding, the official binding is
|
|
* "clock-frequency". Try the official one first and then
|
|
* fall back if it doesn't exist.
|
|
*/
|
|
if (of_property_read_u32(node, "clock-frequency", &i2c->twsi_freq) &&
|
|
of_property_read_u32(node, "clock-rate", &i2c->twsi_freq)) {
|
|
dev_err(i2c->dev,
|
|
"no I2C 'clock-rate' or 'clock-frequency' property\n");
|
|
result = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
i2c->sys_freq = octeon_get_io_clock_rate();
|
|
|
|
init_waitqueue_head(&i2c->queue);
|
|
|
|
i2c->irq = irq;
|
|
|
|
result = devm_request_irq(&pdev->dev, i2c->irq,
|
|
octeon_i2c_isr, 0, DRV_NAME, i2c);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to attach interrupt\n");
|
|
goto out;
|
|
}
|
|
|
|
result = octeon_i2c_init_lowlevel(i2c);
|
|
if (result) {
|
|
dev_err(i2c->dev, "init low level failed\n");
|
|
goto out;
|
|
}
|
|
|
|
octeon_i2c_set_clock(i2c);
|
|
|
|
i2c->adap = octeon_i2c_ops;
|
|
i2c->adap.dev.parent = &pdev->dev;
|
|
i2c->adap.dev.of_node = node;
|
|
i2c_set_adapdata(&i2c->adap, i2c);
|
|
platform_set_drvdata(pdev, i2c);
|
|
|
|
result = i2c_add_adapter(&i2c->adap);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to add adapter\n");
|
|
goto out;
|
|
}
|
|
dev_info(i2c->dev, "probed\n");
|
|
return 0;
|
|
|
|
out:
|
|
return result;
|
|
};
|
|
|
|
static int octeon_i2c_remove(struct platform_device *pdev)
|
|
{
|
|
struct octeon_i2c *i2c = platform_get_drvdata(pdev);
|
|
|
|
i2c_del_adapter(&i2c->adap);
|
|
return 0;
|
|
};
|
|
|
|
static const struct of_device_id octeon_i2c_match[] = {
|
|
{ .compatible = "cavium,octeon-3860-twsi", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, octeon_i2c_match);
|
|
|
|
static struct platform_driver octeon_i2c_driver = {
|
|
.probe = octeon_i2c_probe,
|
|
.remove = octeon_i2c_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = octeon_i2c_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(octeon_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@nsn.com>");
|
|
MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
|
|
MODULE_LICENSE("GPL");
|