Date: Tue, 27 Mar 2012 10:44:32 +0000 (UTC) From: "Jayachandran C." <jchandra@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r233539 - in head/sys: conf dev/iicbus Message-ID: <201203271044.q2RAiWqu081234@svn.freebsd.org>
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Author: jchandra Date: Tue Mar 27 10:44:32 2012 New Revision: 233539 URL: http://svn.freebsd.org/changeset/base/233539 Log: Driver for OpenCores I2C controller. Add a Simple polled driver iicoc for the OpenCores I2C controller. This is used in Netlogic XLP processors. Submitted by: Sreekanth M. S. (kanthms at netlogicmicro com) Added: head/sys/dev/iicbus/iicoc.c (contents, props changed) head/sys/dev/iicbus/iicoc.h (contents, props changed) Modified: head/sys/conf/NOTES head/sys/conf/files Modified: head/sys/conf/NOTES ============================================================================== --- head/sys/conf/NOTES Tue Mar 27 10:00:33 2012 (r233538) +++ head/sys/conf/NOTES Tue Mar 27 10:44:32 2012 (r233539) @@ -2530,6 +2530,7 @@ device smb # ic i2c network interface # iic i2c standard io # iicsmb i2c to smb bridge. Allow i2c i/o with smb commands. +# iicoc simple polling driver for OpenCores I2C controller # # Supported interfaces: # bktr brooktree848 I2C software interface @@ -2543,6 +2544,7 @@ device iicbb device ic device iic device iicsmb # smb over i2c bridge +device iicoc # OpenCores I2C controller support # I2C peripheral devices # Modified: head/sys/conf/files ============================================================================== --- head/sys/conf/files Tue Mar 27 10:00:33 2012 (r233538) +++ head/sys/conf/files Tue Mar 27 10:44:32 2012 (r233539) @@ -1161,6 +1161,7 @@ dev/iicbus/iicbus_if.m optional iicbus dev/iicbus/iiconf.c optional iicbus dev/iicbus/iicsmb.c optional iicsmb \ dependency "iicbus_if.h" +dev/iicbus/iicoc.c optional iicoc dev/iir/iir.c optional iir dev/iir/iir_ctrl.c optional iir dev/iir/iir_pci.c optional iir pci Added: head/sys/dev/iicbus/iicoc.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/iicbus/iicoc.c Tue Mar 27 10:44:32 2012 (r233539) @@ -0,0 +1,390 @@ +/*- + * Copyright (c) 2003-2012 Broadcom Corporation + * All Rights Reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/bus.h> +#include <sys/rman.h> + +#include <machine/bus.h> + +#include <dev/iicbus/iiconf.h> +#include <dev/iicbus/iicbus.h> +#include <dev/iicbus/iicoc.h> + +#include <dev/pci/pcireg.h> +#include <dev/pci/pcivar.h> + +#include "iicbus_if.h" + +static devclass_t iicoc_devclass; + +/* + * Device methods + */ +static int iicoc_probe(device_t); +static int iicoc_attach(device_t); +static int iicoc_detach(device_t); + +static int iicoc_start(device_t dev, u_char slave, int timeout); +static int iicoc_stop(device_t dev); +static int iicoc_read(device_t dev, char *buf, + int len, int *read, int last, int delay); +static int iicoc_write(device_t dev, const char *buf, + int len, int *sent, int timeout); +static int iicoc_repeated_start(device_t dev, u_char slave, int timeout); + +struct iicoc_softc { + device_t dev; /* Self */ + u_int reg_shift; /* Chip specific */ + u_int clockfreq; + u_int i2cfreq; + struct resource *mem_res; /* Memory resource */ + int mem_rid; + int sc_started; + uint8_t i2cdev_addr; + device_t iicbus; + struct mtx sc_mtx; +}; + +static void +iicoc_dev_write(device_t dev, int reg, int value) +{ + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + bus_write_1(sc->mem_res, reg<<sc->reg_shift, value); +} + +static int +iicoc_dev_read(device_t dev, int reg) +{ + uint8_t val; + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + val = bus_read_1(sc->mem_res, reg<<sc->reg_shift); + return (val); +} + +static int +iicoc_wait_on_status(device_t dev, uint8_t bit) +{ + int tries = I2C_TIMEOUT; + uint8_t status; + + do { + status = iicoc_dev_read(dev, OC_I2C_STATUS_REG); + } while ((status & bit) != 0 && --tries > 0); + + return (tries == 0 ? -1: 0); +} + +static int +iicoc_rd_cmd(device_t dev, uint8_t cmd) +{ + uint8_t data; + + iicoc_dev_write(dev, OC_I2C_CMD_REG, cmd); + if (iicoc_wait_on_status(dev, OC_STATUS_TIP) < 0) { + device_printf(dev, "read: Timeout waiting for TIP clear.\n"); + return (-1); + } + data = iicoc_dev_read(dev, OC_I2C_DATA_REG); + return (data); +} + +static int +iicoc_wr_cmd(device_t dev, uint8_t data, uint8_t cmd) +{ + + iicoc_dev_write(dev, OC_I2C_DATA_REG, data); + iicoc_dev_write(dev, OC_I2C_CMD_REG, cmd); + if (iicoc_wait_on_status(dev, OC_STATUS_TIP) < 0) { + device_printf(dev, "write: Timeout waiting for TIP clear.\n"); + return (-1); + } + return (0); +} + +static int +iicoc_wr_ack_cmd(device_t dev, uint8_t data, uint8_t cmd) +{ + if (iicoc_wr_cmd(dev, data, cmd) < 0) + return (-1); + + if (iicoc_dev_read(dev, OC_I2C_STATUS_REG) & OC_STATUS_NACK) { + device_printf(dev, "write: I2C command ACK Error.\n"); + return (IIC_ENOACK); + } + return (0); +} + +static int +iicoc_init(device_t dev) +{ + struct iicoc_softc *sc; + int value; + + sc = device_get_softc(dev); + value = iicoc_dev_read(dev, OC_I2C_CTRL_REG); + iicoc_dev_write(dev, OC_I2C_CTRL_REG, + value & ~(OC_CONTROL_EN | OC_CONTROL_IEN)); + value = (sc->clockfreq/(5 * sc->i2cfreq)) - 1; + iicoc_dev_write(dev, OC_I2C_PRESCALE_LO_REG, value & 0xff); + iicoc_dev_write(dev, OC_I2C_PRESCALE_HI_REG, value >> 8); + value = iicoc_dev_read(dev, OC_I2C_CTRL_REG); + iicoc_dev_write(dev, OC_I2C_CTRL_REG, value | OC_CONTROL_EN); + + value = iicoc_dev_read(dev, OC_I2C_CTRL_REG); + /* return 0 on success, 1 on error */ + return ((value & OC_CONTROL_EN) == 0); +} + +static int +iicoc_probe(device_t dev) +{ + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + if ((pci_get_vendor(dev) == 0x184e) && + (pci_get_device(dev) == 0x1011)) { + sc->clockfreq = XLP_I2C_CLKFREQ; + sc->i2cfreq = XLP_I2C_FREQ; + sc->reg_shift = 2; + device_set_desc(dev, "Netlogic XLP I2C Controller"); + return (BUS_PROBE_DEFAULT); + } + return (ENXIO); +} + + +/* + * We add all the devices which we know about. + * The generic attach routine will attach them if they are alive. + */ +static int +iicoc_attach(device_t dev) +{ + int bus; + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + bus = device_get_unit(dev); + + sc->dev = dev; + mtx_init(&sc->sc_mtx, "iicoc", "iicoc", MTX_DEF); + sc->mem_rid = 0; + sc->mem_res = bus_alloc_resource(dev, + SYS_RES_MEMORY, &sc->mem_rid, 0ul, ~0ul, 0x100, RF_ACTIVE); + + if (sc->mem_res == NULL) { + device_printf(dev, "Could not allocate bus resource.\n"); + return (-1); + } + iicoc_init(dev); + sc->iicbus = device_add_child(dev, "iicbus", -1); + if (sc->iicbus == NULL) { + device_printf(dev, "Could not allocate iicbus instance.\n"); + return (-1); + } + bus_generic_attach(dev); + + return (0); +} + +static int +iicoc_detach(device_t dev) +{ + bus_generic_detach(dev); + + return (0); +} + +static int +iicoc_start(device_t dev, u_char slave, int timeout) +{ + int error = IIC_EBUSBSY; + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + mtx_lock(&sc->sc_mtx); + sc->i2cdev_addr = (slave >> 1); + + /* Verify the bus is idle */ + if (iicoc_wait_on_status(dev, OC_STATUS_BUSY) < 0) + goto i2c_stx_error; + + /* Write Slave Address */ + if (iicoc_wr_ack_cmd(dev, slave, OC_COMMAND_START)) { + device_printf(dev, + "I2C write slave address [0x%x] failed.\n", slave); + error = IIC_ENOACK; + goto i2c_stx_error; + } + + /* Verify Arbitration is not Lost */ + if (iicoc_dev_read(dev, OC_I2C_STATUS_REG) & OC_STATUS_AL) { + device_printf(dev, "I2C Bus Arbitration Lost, Aborting.\n"); + error = IIC_EBUSERR; + goto i2c_stx_error; + } + error = IIC_NOERR; + mtx_unlock(&sc->sc_mtx); + return (error); +i2c_stx_error: + iicoc_dev_write(dev, OC_I2C_CMD_REG, OC_COMMAND_STOP); + iicoc_wait_on_status(dev, OC_STATUS_BUSY); /* wait for idle */ + mtx_unlock(&sc->sc_mtx); + return (error); +} + +static int +iicoc_stop(device_t dev) +{ + int error = 0; + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + mtx_lock(&sc->sc_mtx); + iicoc_dev_write(dev, OC_I2C_CMD_REG, OC_COMMAND_STOP); + iicoc_wait_on_status(dev, OC_STATUS_BUSY); /* wait for idle */ + mtx_unlock(&sc->sc_mtx); + return (error); + +} + +static int +iicoc_write(device_t dev, const char *buf, int len, + int *sent, int timeout /* us */ ) +{ + uint8_t value; + int i; + + value = buf[0]; + /* Write Slave Offset */ + if (iicoc_wr_ack_cmd(dev, value, OC_COMMAND_WRITE)) { + device_printf(dev, "I2C write slave offset failed.\n"); + goto i2c_tx_error; + } + + for (i = 1; i < len; i++) { + /* Write data byte */ + value = buf[i]; + if (iicoc_wr_cmd(dev, value, OC_COMMAND_WRITE)) { + device_printf(dev, "I2C write data byte %d failed.\n", + i); + goto i2c_tx_error; + } + } + *sent = len; + return (IIC_NOERR); + +i2c_tx_error: + return (IIC_EBUSERR); +} + +static int +iicoc_read(device_t dev, char *buf, int len, int *read, int last, + int delay) +{ + int data, i; + uint8_t cmd; + + for (i = 0; i < len; i++) { + /* Read data byte */ + cmd = (i == len - 1) ? OC_COMMAND_RDNACK : OC_COMMAND_READ; + data = iicoc_rd_cmd(dev, cmd); + if (data < 0) { + device_printf(dev, + "I2C read data byte %d failed.\n", i); + goto i2c_rx_error; + } + buf[i] = (uint8_t)data; + } + + *read = len; + return (IIC_NOERR); + +i2c_rx_error: + return (IIC_EBUSERR); +} + +static int +iicoc_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr) +{ + int error; + struct iicoc_softc *sc; + + sc = device_get_softc(dev); + mtx_lock(&sc->sc_mtx); + error = iicoc_init(dev); + mtx_unlock(&sc->sc_mtx); + return (error); +} + +static int +iicoc_repeated_start(device_t dev, u_char slave, int timeout) +{ + return 0; +} + +static device_method_t iicoc_methods[] = { + /* device interface */ + DEVMETHOD(device_probe, iicoc_probe), + DEVMETHOD(device_attach, iicoc_attach), + DEVMETHOD(device_detach, iicoc_detach), + + /* iicbus interface */ + DEVMETHOD(iicbus_callback, iicbus_null_callback), + DEVMETHOD(iicbus_repeated_start, iicoc_repeated_start), + DEVMETHOD(iicbus_start, iicoc_start), + DEVMETHOD(iicbus_stop, iicoc_stop), + DEVMETHOD(iicbus_reset, iicoc_reset), + DEVMETHOD(iicbus_write, iicoc_write), + DEVMETHOD(iicbus_read, iicoc_read), + DEVMETHOD(iicbus_transfer, iicbus_transfer_gen), + + DEVMETHOD_END +}; + +static driver_t iicoc_driver = { + "iicoc", + iicoc_methods, + sizeof(struct iicoc_softc), +}; + +DRIVER_MODULE(iicoc, pci, iicoc_driver, iicoc_devclass, 0, 0); +DRIVER_MODULE(iicbus, iicoc, iicbus_driver, iicbus_devclass, 0, 0); Added: head/sys/dev/iicbus/iicoc.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/iicbus/iicoc.h Tue Mar 27 10:44:32 2012 (r233539) @@ -0,0 +1,78 @@ +/*- + * Copyright (c) 2003-2012 Broadcom Corporation + * All Rights Reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef __OPENCORE_I2C_H__ +#define __OPENCORE_I2C_H__ + +/* I2C specific registers */ +#define OC_I2C_PRESCALE_LO_REG 0x00 +#define OC_I2C_PRESCALE_HI_REG 0x01 +#define OC_I2C_CTRL_REG 0x02 +#define OC_I2C_TRANSMIT_REG 0x03 /* tx and rx - same reg */ +#define OC_I2C_RECV_REG 0x03 /* tx and rx - same reg */ +#define OC_I2C_DATA_REG 0x03 /* tx and rx - same reg */ +#define OC_I2C_CMD_REG 0x04 /* cmd and status - same reg */ +#define OC_I2C_STATUS_REG 0x04 /* cmd and status - same reg */ + +#define XLP_I2C_CLKFREQ 133333333 /* XLP 133 MHz IO clock */ +#define XLP_I2C_FREQ 100000 /* default 100kHz */ +#define I2C_TIMEOUT 500000 + +/* + * These defines pertain to the OpenCores + * I2C Master Host Controller used in XLP + */ + +#define OC_PRESCALER_LO 0 +#define OC_PRESCALER_HI 1 + +#define OC_CONTROL 2 +#define OC_CONTROL_EN 0x80 +#define OC_CONTROL_IEN 0x40 + +#define OC_DATA 3 /* Data TX & RX Reg */ + +#define OC_COMMAND 4 +#define OC_COMMAND_START 0x90 +#define OC_COMMAND_STOP 0x40 +#define OC_COMMAND_READ 0x20 +#define OC_COMMAND_WRITE 0x10 +#define OC_COMMAND_RDACK 0x20 +#define OC_COMMAND_RDNACK 0x28 +#define OC_COMMAND_IACK 0x01 /* Not used */ + +#define OC_STATUS 4 /* Same as 'command' */ +#define OC_STATUS_NACK 0x80 /* Did not get an ACK */ +#define OC_STATUS_BUSY 0x40 +#define OC_STATUS_AL 0x20 /* Arbitration Lost */ +#define OC_STATUS_TIP 0x02 /* Transfer in Progress */ +#define OC_STATUS_IF 0x01 /* Intr. Pending Flag */ + +#endif
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