718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
394 lines
9.4 KiB
C
394 lines
9.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003-2012 Broadcom Corporation
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* All Rights Reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iicoc.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include "iicbus_if.h"
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static devclass_t iicoc_devclass;
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/*
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* Device methods
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*/
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static int iicoc_probe(device_t);
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static int iicoc_attach(device_t);
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static int iicoc_detach(device_t);
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static int iicoc_start(device_t dev, u_char slave, int timeout);
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static int iicoc_stop(device_t dev);
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static int iicoc_read(device_t dev, char *buf,
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int len, int *read, int last, int delay);
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static int iicoc_write(device_t dev, const char *buf,
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int len, int *sent, int timeout);
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static int iicoc_repeated_start(device_t dev, u_char slave, int timeout);
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struct iicoc_softc {
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device_t dev; /* Self */
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u_int reg_shift; /* Chip specific */
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u_int clockfreq;
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u_int i2cfreq;
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struct resource *mem_res; /* Memory resource */
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int mem_rid;
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int sc_started;
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uint8_t i2cdev_addr;
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device_t iicbus;
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struct mtx sc_mtx;
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};
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static void
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iicoc_dev_write(device_t dev, int reg, int value)
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{
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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bus_write_1(sc->mem_res, reg<<sc->reg_shift, value);
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}
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static int
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iicoc_dev_read(device_t dev, int reg)
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{
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uint8_t val;
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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val = bus_read_1(sc->mem_res, reg<<sc->reg_shift);
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return (val);
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}
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static int
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iicoc_wait_on_status(device_t dev, uint8_t bit)
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{
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int tries = I2C_TIMEOUT;
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uint8_t status;
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do {
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status = iicoc_dev_read(dev, OC_I2C_STATUS_REG);
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} while ((status & bit) != 0 && --tries > 0);
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return (tries == 0 ? -1: 0);
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}
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static int
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iicoc_rd_cmd(device_t dev, uint8_t cmd)
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{
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uint8_t data;
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iicoc_dev_write(dev, OC_I2C_CMD_REG, cmd);
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if (iicoc_wait_on_status(dev, OC_STATUS_TIP) < 0) {
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device_printf(dev, "read: Timeout waiting for TIP clear.\n");
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return (-1);
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}
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data = iicoc_dev_read(dev, OC_I2C_DATA_REG);
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return (data);
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}
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static int
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iicoc_wr_cmd(device_t dev, uint8_t data, uint8_t cmd)
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{
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iicoc_dev_write(dev, OC_I2C_DATA_REG, data);
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iicoc_dev_write(dev, OC_I2C_CMD_REG, cmd);
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if (iicoc_wait_on_status(dev, OC_STATUS_TIP) < 0) {
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device_printf(dev, "write: Timeout waiting for TIP clear.\n");
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return (-1);
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}
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return (0);
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}
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static int
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iicoc_wr_ack_cmd(device_t dev, uint8_t data, uint8_t cmd)
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{
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if (iicoc_wr_cmd(dev, data, cmd) < 0)
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return (-1);
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if (iicoc_dev_read(dev, OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
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device_printf(dev, "write: I2C command ACK Error.\n");
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return (IIC_ENOACK);
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}
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return (0);
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}
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static int
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iicoc_init(device_t dev)
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{
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struct iicoc_softc *sc;
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int value;
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sc = device_get_softc(dev);
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value = iicoc_dev_read(dev, OC_I2C_CTRL_REG);
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iicoc_dev_write(dev, OC_I2C_CTRL_REG,
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value & ~(OC_CONTROL_EN | OC_CONTROL_IEN));
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value = (sc->clockfreq/(5 * sc->i2cfreq)) - 1;
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iicoc_dev_write(dev, OC_I2C_PRESCALE_LO_REG, value & 0xff);
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iicoc_dev_write(dev, OC_I2C_PRESCALE_HI_REG, value >> 8);
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value = iicoc_dev_read(dev, OC_I2C_CTRL_REG);
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iicoc_dev_write(dev, OC_I2C_CTRL_REG, value | OC_CONTROL_EN);
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value = iicoc_dev_read(dev, OC_I2C_CTRL_REG);
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/* return 0 on success, 1 on error */
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return ((value & OC_CONTROL_EN) == 0);
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}
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static int
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iicoc_probe(device_t dev)
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{
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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if ((pci_get_vendor(dev) == 0x184e) &&
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(pci_get_device(dev) == 0x1011)) {
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sc->clockfreq = XLP_I2C_CLKFREQ;
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sc->i2cfreq = XLP_I2C_FREQ;
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sc->reg_shift = 2;
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device_set_desc(dev, "Netlogic XLP I2C Controller");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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/*
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* We add all the devices which we know about.
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* The generic attach routine will attach them if they are alive.
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*/
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static int
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iicoc_attach(device_t dev)
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{
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int bus;
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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bus = device_get_unit(dev);
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sc->dev = dev;
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mtx_init(&sc->sc_mtx, "iicoc", "iicoc", MTX_DEF);
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sc->mem_rid = 0;
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sc->mem_res = bus_alloc_resource_anywhere(dev,
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SYS_RES_MEMORY, &sc->mem_rid, 0x100, RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "Could not allocate bus resource.\n");
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return (-1);
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}
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iicoc_init(dev);
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sc->iicbus = device_add_child(dev, "iicbus", -1);
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if (sc->iicbus == NULL) {
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device_printf(dev, "Could not allocate iicbus instance.\n");
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return (-1);
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}
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bus_generic_attach(dev);
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return (0);
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}
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static int
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iicoc_detach(device_t dev)
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{
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bus_generic_detach(dev);
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device_delete_children(dev);
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return (0);
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}
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static int
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iicoc_start(device_t dev, u_char slave, int timeout)
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{
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int error = IIC_EBUSERR;
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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mtx_lock(&sc->sc_mtx);
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sc->i2cdev_addr = (slave >> 1);
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/* Verify the bus is idle */
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if (iicoc_wait_on_status(dev, OC_STATUS_BUSY) < 0)
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goto i2c_stx_error;
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/* Write Slave Address */
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if (iicoc_wr_ack_cmd(dev, slave, OC_COMMAND_START)) {
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device_printf(dev,
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"I2C write slave address [0x%x] failed.\n", slave);
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error = IIC_ENOACK;
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goto i2c_stx_error;
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}
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/* Verify Arbitration is not Lost */
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if (iicoc_dev_read(dev, OC_I2C_STATUS_REG) & OC_STATUS_AL) {
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device_printf(dev, "I2C Bus Arbitration Lost, Aborting.\n");
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error = IIC_EBUSERR;
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goto i2c_stx_error;
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}
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error = IIC_NOERR;
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mtx_unlock(&sc->sc_mtx);
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return (error);
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i2c_stx_error:
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iicoc_dev_write(dev, OC_I2C_CMD_REG, OC_COMMAND_STOP);
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iicoc_wait_on_status(dev, OC_STATUS_BUSY); /* wait for idle */
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mtx_unlock(&sc->sc_mtx);
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return (error);
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}
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static int
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iicoc_stop(device_t dev)
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{
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int error = 0;
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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mtx_lock(&sc->sc_mtx);
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iicoc_dev_write(dev, OC_I2C_CMD_REG, OC_COMMAND_STOP);
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iicoc_wait_on_status(dev, OC_STATUS_BUSY); /* wait for idle */
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mtx_unlock(&sc->sc_mtx);
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return (error);
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}
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static int
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iicoc_write(device_t dev, const char *buf, int len,
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int *sent, int timeout /* us */ )
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{
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uint8_t value;
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int i;
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value = buf[0];
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/* Write Slave Offset */
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if (iicoc_wr_ack_cmd(dev, value, OC_COMMAND_WRITE)) {
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device_printf(dev, "I2C write slave offset failed.\n");
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goto i2c_tx_error;
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}
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for (i = 1; i < len; i++) {
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/* Write data byte */
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value = buf[i];
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if (iicoc_wr_cmd(dev, value, OC_COMMAND_WRITE)) {
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device_printf(dev, "I2C write data byte %d failed.\n",
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i);
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goto i2c_tx_error;
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}
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}
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*sent = len;
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return (IIC_NOERR);
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i2c_tx_error:
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return (IIC_EBUSERR);
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}
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static int
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iicoc_read(device_t dev, char *buf, int len, int *read, int last,
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int delay)
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{
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int data, i;
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uint8_t cmd;
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for (i = 0; i < len; i++) {
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/* Read data byte */
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cmd = (i == len - 1) ? OC_COMMAND_RDNACK : OC_COMMAND_READ;
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data = iicoc_rd_cmd(dev, cmd);
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if (data < 0) {
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device_printf(dev,
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"I2C read data byte %d failed.\n", i);
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goto i2c_rx_error;
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}
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buf[i] = (uint8_t)data;
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}
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*read = len;
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return (IIC_NOERR);
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i2c_rx_error:
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return (IIC_EBUSERR);
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}
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static int
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iicoc_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr)
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{
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int error;
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struct iicoc_softc *sc;
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sc = device_get_softc(dev);
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mtx_lock(&sc->sc_mtx);
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error = iicoc_init(dev);
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mtx_unlock(&sc->sc_mtx);
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return (error);
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}
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static int
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iicoc_repeated_start(device_t dev, u_char slave, int timeout)
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{
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return 0;
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}
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static device_method_t iicoc_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, iicoc_probe),
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DEVMETHOD(device_attach, iicoc_attach),
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DEVMETHOD(device_detach, iicoc_detach),
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/* iicbus interface */
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DEVMETHOD(iicbus_callback, iicbus_null_callback),
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DEVMETHOD(iicbus_repeated_start, iicoc_repeated_start),
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DEVMETHOD(iicbus_start, iicoc_start),
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DEVMETHOD(iicbus_stop, iicoc_stop),
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DEVMETHOD(iicbus_reset, iicoc_reset),
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DEVMETHOD(iicbus_write, iicoc_write),
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DEVMETHOD(iicbus_read, iicoc_read),
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DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),
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DEVMETHOD_END
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};
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static driver_t iicoc_driver = {
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"iicoc",
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iicoc_methods,
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sizeof(struct iicoc_softc),
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};
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DRIVER_MODULE(iicoc, pci, iicoc_driver, iicoc_devclass, 0, 0);
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DRIVER_MODULE(iicbus, iicoc, iicbus_driver, iicbus_devclass, 0, 0);
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