Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756161AbXLUTgU (ORCPT ); Fri, 21 Dec 2007 14:36:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752627AbXLUTgN (ORCPT ); Fri, 21 Dec 2007 14:36:13 -0500 Received: from mail0.scram.de ([78.47.204.202]:45513 "EHLO mail0.scram.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753278AbXLUTgL (ORCPT ); Fri, 21 Dec 2007 14:36:11 -0500 X-Spam-Score: -3.933 X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] * 0.5 AWL AWL: From: address is in the auto white-list Message-ID: <476C15BC.3090807@scram.de> Date: Fri, 21 Dec 2007 20:36:28 +0100 From: Jochen Friedrich User-Agent: Mozilla-Thunderbird 2.0.0.6 (X11/20071009) MIME-Version: 1.0 To: Scott Wood CC: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org, i2c@lm-sensors.org Subject: [PATCH POWERPC] i2c: adds support for i2c bus on Frescale CPM1/CPM2 controllers Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 24166 Lines: 898 Using the port of 2.4 code from Vitaly Bordug and the actual algorithm used by the i2c driver of the DBox code on cvs.tuxboc.org from Tmbinc, Gillem (htoa@gmx.net). Renamed i2c-rpx.c and i2c-algo-8xx.c to i2c-cpm.c and converted the driver to an of_platform_driver. Signed-off-by: Jochen Friedrich --- arch/powerpc/boot/dts/mpc866ads.dts | 10 + arch/powerpc/boot/dts/mpc885ads.dts | 10 + arch/powerpc/platforms/8xx/mpc885ads_setup.c | 5 + drivers/i2c/busses/Kconfig | 10 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-cpm.c | 776 ++++++++++++++++++++++++++ 6 files changed, 812 insertions(+), 0 deletions(-) create mode 100644 drivers/i2c/busses/i2c-cpm.c diff --git a/arch/powerpc/boot/dts/mpc866ads.dts b/arch/powerpc/boot/dts/mpc866ads.dts index 90f2293..c79cac1 100644 --- a/arch/powerpc/boot/dts/mpc866ads.dts +++ b/arch/powerpc/boot/dts/mpc866ads.dts @@ -141,6 +141,16 @@ interrupts = <1e 3>; interrupt-parent = <&Cpm_pic>; }; + + i2c@860 { + compatible = "fsl,mpc866-i2c", + "fsl,cpm1-i2c", + "fsl,cpm-i2c"; + reg = <860 20 3c80 30>; + interrupts = <10 3>; + interrupt-parent = <&Cpm_pic>; + fsl,cpm-command = <0010>; + }; }; }; }; diff --git a/arch/powerpc/boot/dts/mpc885ads.dts b/arch/powerpc/boot/dts/mpc885ads.dts index 8848e63..fd9c9d7 100644 --- a/arch/powerpc/boot/dts/mpc885ads.dts +++ b/arch/powerpc/boot/dts/mpc885ads.dts @@ -213,6 +213,16 @@ fsl,cpm-command = <0080>; linux,network-index = <2>; }; + + i2c@860 { + compatible = "fsl,mpc885-i2c", + "fsl,cpm1-i2c", + "fsl,cpm-i2c"; + reg = <860 20 3c80 30>; + interrupts = <10>; + interrupt-parent = <&CPM_PIC>; + fsl,cpm-command = <0010>; + }; }; }; diff --git a/arch/powerpc/platforms/8xx/mpc885ads_setup.c b/arch/powerpc/platforms/8xx/mpc885ads_setup.c index 2cf1b6a..4377521 100644 --- a/arch/powerpc/platforms/8xx/mpc885ads_setup.c +++ b/arch/powerpc/platforms/8xx/mpc885ads_setup.c @@ -157,6 +157,11 @@ static struct cpm_pin mpc885ads_pins[] = { {CPM_PORTE, 28, CPM_PIN_OUTPUT}, {CPM_PORTE, 29, CPM_PIN_OUTPUT}, #endif + /* I2C */ +#ifdef CONFIG_I2C_8XX + {CPM_PORTB, 26, CPM_PIN_INPUT | CPM_PIN_OPENDRAIN}, + {CPM_PORTB, 27, CPM_PIN_INPUT | CPM_PIN_OPENDRAIN}, +#endif }; static void __init init_ioports(void) diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index c466c6c..5950172 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -114,6 +114,16 @@ config I2C_BLACKFIN_TWI_CLK_KHZ help The unit of the TWI clock is kHz. +config I2C_CPM + tristate "Freescale CPM1 or CPM2 (MPC8xx/826x)" + depends on (CPM1 || CPM2) && I2C && PPC_OF + help + This supports the use of the I2C interface on Freescale + processors with CPM1 or CPM2. + + This driver can also be built as a module. If so, the module + will be called i2c-cpm. + config I2C_DAVINCI tristate "DaVinci I2C driver" depends on ARCH_DAVINCI diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 81d43c2..a395555 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_I2C_AMD8111) += i2c-amd8111.o obj-$(CONFIG_I2C_AT91) += i2c-at91.o obj-$(CONFIG_I2C_AU1550) += i2c-au1550.o obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o +obj-$(CONFIG_I2C_CPM) += i2c-cpm.o obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c new file mode 100644 index 0000000..c3714f6 --- /dev/null +++ b/drivers/i2c/busses/i2c-cpm.c @@ -0,0 +1,776 @@ +/* + * Freescale CPM1/CPM2 I2C interface. + * Copyright (c) 1999 Dan Malek (dmalek@jlc.net). + * + * moved into proper i2c interface; + * Brad Parker (brad@heeltoe.com) + * + * (C) 2007 Montavista Software, Inc. + * Vitaly Bordug + * + * RPX lite specific parts of the i2c interface + * Update: There actually isn't anything RPXLite-specific about this module. + * This should work for most any CPM board. The console messages have been + * changed to eliminate RPXLite references. + * + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * moved into proper i2c interface; separated out platform specific + * parts into i2c-8xx.c + * Brad Parker (brad@heeltoe.com) + * + * Parts from dbox2_i2c.c (cvs.tuxbox.org) + * (C) 2000-2001 Tmbinc, Gillem (htoa@gmx.net) + * + * (C) 2007 Montavista Software, Inc. + * Vitaly Bordug + * + * Converted to of_platform_device. Renamed to i2c-cpm.c. + * (C) 2007 Jochen Friedrich + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Try to define this if you have an older CPU (earlier than rev D4) */ +/* However, better use a GPIO based bitbang driver in this case :/ */ +#undef I2C_CHIP_ERRATA + +#define CPM_MAX_READ 513 +#define CPM_MAXBD 4 + +/* Buffer descriptors used by many of the CPM protocols. */ +typedef struct cpm_buf_desc { + ushort cbd_sc; /* Status and Control */ + ushort cbd_datlen; /* Data length in buffer */ + uint cbd_bufaddr; /* Buffer address in host memory */ +} cbd_t; + +#define BD_I2C_EMPTY (0x8000) /* Receive is empty */ +#define BD_I2C_READY (0x8000) /* Transmit is ready */ +#define BD_I2C_WRAP (0x2000) /* Last buffer descriptor */ +#define BD_I2C_INTRPT (0x1000) /* Interrupt on change */ +#define BD_I2C_LAST (0x0800) /* Last buffer in frame */ +#define BD_I2C_START (0x0400) /* Send start condition */ +#define BD_I2C_NAK (0x0004) /* NAK - did not respond */ +#define BD_I2C_OV (0x0002) /* OV - receive overrun */ +#define BD_I2C_UN (0x0002) /* UN - transmit underrun */ +#define BD_I2C_CL (0x0001) /* Collision */ + +#define CPM_CR_INIT_TRX (0x00) +#define CPM_CR_CLOSE_RXBD (0x07) + +#define I2C_EB (0x10) /* Big endian mode */ + +/* I2C parameter RAM. */ +typedef struct i2c_ram { + ushort rbase; /* Rx Buffer descriptor base address */ + ushort tbase; /* Tx Buffer descriptor base address */ + u_char rfcr; /* Rx function code */ + u_char tfcr; /* Tx function code */ + ushort mrblr; /* Max receive buffer length */ + uint rstate; /* Internal */ + uint rdp; /* Internal */ + ushort rbptr; /* Rx Buffer descriptor pointer */ + ushort rbc; /* Internal */ + uint rxtmp; /* Internal */ + uint tstate; /* Internal */ + uint tdp; /* Internal */ + ushort tbptr; /* Tx Buffer descriptor pointer */ + ushort tbc; /* Internal */ + uint txtmp; /* Internal */ + char res1[4]; /* Reserved */ + ushort rpbase; /* Relocation pointer */ +} i2c_ram_t; + +/* I2C Registers */ +typedef struct i2c_reg { + u8 i2mod; + u8 res1[3]; + u8 i2add; + u8 res2[3]; + u8 i2brg; + u8 res3[3]; + u8 i2com; + u8 res4[3]; + u8 i2cer; + u8 res5[3]; + u8 i2cmr; +} i2c_reg_t; + +struct cpm_i2c { + char *base; + struct of_device *ofdev; + struct i2c_adapter adap; + uint dp_addr; + int reloc; + int version; /* CPM1=1, CPM2=2 */ + int irq; + int cp_command; + i2c_reg_t __iomem *i2c_reg; + i2c_ram_t __iomem *i2c_ram; + u16 i2c_addr; + wait_queue_head_t i2c_wait; + struct mutex i2c_mutex; /* Protects I2C CPM */ + u_char *txbuf[CPM_MAXBD]; + u_char *rxbuf[CPM_MAXBD]; + u32 txdma[CPM_MAXBD]; + u32 rxdma[CPM_MAXBD]; +}; + +static irqreturn_t cpm_i2c_interrupt(int irq, void *dev_id) +{ + struct i2c_adapter *adap; + struct cpm_i2c *cpm; + i2c_reg_t __iomem *i2c_reg; + int i; + + adap = (struct i2c_adapter *) dev_id; + cpm = i2c_get_adapdata(adap); + i2c_reg = cpm->i2c_reg; + + /* Clear interrupt. + */ + i = in_8(&i2c_reg->i2cer); + out_8(&i2c_reg->i2cer, i); + + dev_dbg(&adap->dev, "Interrupt: %x\n", i); + + /* Get 'me going again. + */ + wake_up_interruptible(&cpm->i2c_wait); + + return i ? IRQ_HANDLED : IRQ_NONE; +} + +static void cpm_reset_i2c_params(struct cpm_i2c *cpm) +{ + i2c_ram_t __iomem *i2c_ram = cpm->i2c_ram; + + /* Set up the IIC parameters in the parameter ram. + */ + out_be16(&i2c_ram->tbase, cpm->dp_addr); + out_be16(&i2c_ram->rbase, cpm->dp_addr + sizeof(cbd_t) * CPM_MAXBD); + + out_8(&i2c_ram->tfcr, I2C_EB); + out_8(&i2c_ram->rfcr, I2C_EB); + + out_be16(&i2c_ram->mrblr, CPM_MAX_READ); + + out_be32(&i2c_ram->rstate, 0); + out_be32(&i2c_ram->rdp, 0); + out_be16(&i2c_ram->rbptr, in_be16(&i2c_ram->rbase)); + out_be16(&i2c_ram->rbc, 0); + out_be32(&i2c_ram->rxtmp, 0); + out_be32(&i2c_ram->tstate, 0); + out_be32(&i2c_ram->tdp, 0); + out_be16(&i2c_ram->tbptr, in_be16(&i2c_ram->tbase)); + out_be16(&i2c_ram->tbc, 0); + out_be32(&i2c_ram->txtmp, 0); +} + +static int cpm_i2c_init(struct i2c_adapter *adap) +{ + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + i2c_ram_t __iomem *i2c_ram = cpm->i2c_ram; + i2c_reg_t __iomem *i2c_reg = cpm->i2c_reg; + unsigned char brg; + int ret, i; + + pr_debug("i2c-cpm: cpm_i2c_init()\n"); + + ret = 0; + init_waitqueue_head(&cpm->i2c_wait); + mutex_init(&cpm->i2c_mutex); + + /* Initialize Tx/Rx parameters. */ + + cpm_reset_i2c_params(cpm); + + pr_debug("i2c-cpm: i2c_ram %x, dp_addr 0x%x\n", (uint) cpm->i2c_ram, + cpm->dp_addr); + pr_debug("i2c-cpm: tbase %d, rbase %d\n", + in_be16(&i2c_ram->tbase), in_be16(&i2c_ram->rbase)); + + cpm_command(cpm->cp_command, CPM_CR_INIT_TRX); + + /* Select an invalid address. Just make sure we don't use loopback mode + */ + out_8(&i2c_reg->i2add, 0xfe); + + /* Make clock run at 60 kHz. */ + + brg = get_brgfreq() / (32 * 2 * 60000) - 3; + out_8(&i2c_reg->i2brg, brg); + + out_8(&i2c_reg->i2mod, 0x00); + out_8(&i2c_reg->i2com, 0x01); /* Master mode */ + + /* Disable interrupts. */ + out_8(&i2c_reg->i2cmr, 0); + out_8(&i2c_reg->i2cer, 0xff); + + /* Allocate TX and RX buffers */ + for (i = 0; i < CPM_MAXBD; i++) { + cpm->rxbuf[i] = dma_alloc_coherent( + NULL, CPM_MAX_READ + 1, &cpm->rxdma[i], GFP_KERNEL); + if (!cpm->rxbuf[i]) { + ret = -ENOMEM; + goto out; + } + cpm->txbuf[i] = (unsigned char *)dma_alloc_coherent( + NULL, CPM_MAX_READ + 1, &cpm->txdma[i], GFP_KERNEL); + if (!cpm->txbuf[i]) { + ret = -ENOMEM; + goto out; + } + } + + /* Install interrupt handler. + */ + ret = request_irq(cpm->irq, cpm_i2c_interrupt, 0, "cpm_i2c", adap); + if (ret) + goto out; + + return 0; + +out: + for (i = 0; i < CPM_MAXBD; i++) { + if (cpm->rxbuf[i]) + dma_free_coherent(NULL, CPM_MAX_READ + 1, + cpm->rxbuf[i], cpm->rxdma[i]); + if (cpm->txbuf[i]) + dma_free_coherent(NULL, CPM_MAX_READ + 1, + cpm->txbuf[i], cpm->txdma[i]); + } + return ret; +} + +static int cpm_i2c_shutdown(struct i2c_adapter *adap) +{ + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + int i; + + i2c_reg_t __iomem *i2c_reg = cpm->i2c_reg; + + /* Shut down IIC. */ + out_8(&i2c_reg->i2mod, in_8(&i2c_reg->i2mod) | ~1); + out_8(&i2c_reg->i2cmr, 0); + out_8(&i2c_reg->i2cer, 0xff); + + for (i = 0; i < CPM_MAXBD; i++) { + if (cpm->rxbuf[i]) + dma_free_coherent(NULL, CPM_MAX_READ + 1, + cpm->rxbuf[i], cpm->rxdma[i]); + if (cpm->txbuf[i]) + dma_free_coherent(NULL, CPM_MAX_READ + 1, + cpm->txbuf[i], cpm->txdma[i]); + } + + free_irq(cpm->irq, adap); + + return 0; +} + +static void cpm_i2c_force_close(struct i2c_adapter *adap) +{ + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + i2c_reg_t __iomem *i2c_reg = cpm->i2c_reg; + + dev_dbg(&adap->dev, "cpm_i2c_force_close()\n"); + + cpm_command(cpm->cp_command, CPM_CR_CLOSE_RXBD); + + out_8(&i2c_reg->i2cmr, 0x00); /* Disable all interrupts */ + out_8(&i2c_reg->i2cer, 0xff); +} + +static void cpm_i2c_parse_message(struct i2c_adapter *adap, + struct i2c_msg *pmsg, int num, int tx, int rx) +{ + cbd_t *tbdf, *rbdf; + u_char addr; + u_char *tb; + u_char *rb; + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + i2c_ram_t __iomem *i2c_ram = cpm->i2c_ram; + int i, dscan; + + tbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->tbase)); + rbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->rbase)); + + /* This chip can't do zero length writes. However, the i2c core uses + them to scan for devices. The best we can do is to convert them + into 1 byte reads */ + + dscan = ((pmsg->len == 0) && (num == 1)); + + addr = pmsg->addr << 1; + if ((pmsg->flags & I2C_M_RD) || dscan) + addr |= 1; + + tb = cpm->txbuf[tx]; + rb = cpm->rxbuf[rx]; + + /* Align read buffer */ + rb = (u_char *) (((ulong) rb + 1) & ~1); + + if ((pmsg->flags & I2C_M_RD) || dscan) { + /* To read, we need an empty buffer of the proper length. + * All that is used is the first byte for address, the remainder + * is just used for timing (and doesn't really have to exist). + */ + tb[0] = addr; /* Device address byte w/rw flag */ + + dev_dbg(&adap->dev, "cpm_i2c_read(abyte=0x%x)\n", addr); + tbdf[tx].cbd_bufaddr = cpm->txdma[tx]; + + if (dscan) + tbdf[tx].cbd_datlen = 2; + else + tbdf[tx].cbd_datlen = pmsg->len + 1; + + tbdf[tx].cbd_sc = 0; + + if (!(pmsg->flags & I2C_M_NOSTART)) + tbdf[tx].cbd_sc |= BD_I2C_START; + if (tx + 1 == num) + tbdf[tx].cbd_sc |= BD_I2C_LAST | BD_I2C_WRAP; + + rbdf[rx].cbd_datlen = 0; + rbdf[rx].cbd_bufaddr = ((cpm->rxdma[rx] + 1) & ~1); + rbdf[rx].cbd_sc = BD_I2C_EMPTY | BD_I2C_INTRPT; + + if (rx + 1 == CPM_MAXBD) + tbdf[rx].cbd_sc |= BD_I2C_WRAP; + + eieio(); + tbdf[tx].cbd_sc |= BD_I2C_READY; + } else { + tb[0] = addr; /* Device address byte w/rw flag */ + for (i = 0; i < pmsg->len; i++) + tb[i+1] = pmsg->buf[i]; + + dev_dbg(&adap->dev, "cpm_iic_write(abyte=0x%x)\n", addr); + + tbdf[tx].cbd_bufaddr = cpm->txdma[tx]; + tbdf[tx].cbd_datlen = pmsg->len + 1; + tbdf[tx].cbd_sc = 0; + + if (!(pmsg->flags & I2C_M_NOSTART)) + tbdf[tx].cbd_sc |= BD_I2C_START; + + if (tx + 1 == num) + tbdf[tx].cbd_sc |= BD_I2C_LAST | BD_I2C_WRAP; + + eieio(); + tbdf[tx].cbd_sc |= BD_I2C_READY | BD_I2C_INTRPT; + + dev_dbg(&adap->dev, "tx sc %d %04x\n", + tx, tbdf[tx].cbd_sc); + } +} + +static int cpm_i2c_check_message(struct i2c_adapter *adap, + struct i2c_msg *pmsg, int tx, int rx) +{ + cbd_t *tbdf, *rbdf; + u_char *tb; + u_char *rb; + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + i2c_ram_t __iomem *i2c_ram = cpm->i2c_ram; + int i; + + tbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->tbase)); + rbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->rbase)); + + tb = cpm->txbuf[tx]; + rb = cpm->rxbuf[rx]; + + /* Align read buffer */ + rb = (u_char *) (((uint) rb + 1) & ~1); + + if (pmsg->flags & I2C_M_RD) { + dev_dbg(&adap->dev, "rx sc %04x, rx sc %04x\n", + tbdf[tx].cbd_sc, rbdf[rx].cbd_sc); + + if (tbdf[tx].cbd_sc & BD_I2C_NAK) { + dev_dbg(&adap->dev, "IIC read; No ack\n"); + + if (pmsg->flags & I2C_M_IGNORE_NAK) + return 0; + else + return -EIO; + } + if (rbdf[rx].cbd_sc & BD_I2C_EMPTY) { + dev_dbg(&adap->dev, + "IIC read; complete but rbuf empty\n"); + return -EREMOTEIO; + } + if (rbdf[rx].cbd_sc & BD_I2C_OV) { + dev_dbg(&adap->dev, "IIC read; Overrun\n"); + return -EREMOTEIO; + } + for (i = 0; i < pmsg->len; i++) + pmsg->buf[i] = rb[i]; + } else { + dev_dbg(&adap->dev, "tx sc %d %04x\n", tx, tbdf[tx].cbd_sc); + + if (tbdf[tx].cbd_sc & BD_I2C_NAK) { + dev_dbg(&adap->dev, "IIC write; No ack\n"); + + if (pmsg->flags & I2C_M_IGNORE_NAK) + return 0; + else + return -EIO; + } + if (tbdf[tx].cbd_sc & BD_I2C_UN) { + dev_dbg(&adap->dev, "IIC write; Underrun\n"); + return -EIO; + } + if (tbdf[tx].cbd_sc & BD_I2C_CL) { + dev_dbg(&adap->dev, "IIC write; Collision\n"); + return -EIO; + } + } + return 0; +} + +static int cpm_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) +{ + struct cpm_i2c *cpm = i2c_get_adapdata(adap); + i2c_reg_t __iomem *i2c_reg = cpm->i2c_reg; + i2c_ram_t __iomem *i2c_ram = cpm->i2c_ram; + struct i2c_msg *pmsg, *rmsg; + int ret, i; + int tptr; + int rptr; + cbd_t *tbdf, *rbdf; + + if (num > CPM_MAXBD) + return -EINVAL; + + /* Check if we have any oversized READ requests */ + for (i = 0; i < num; i++) { + pmsg = &msgs[i]; + if (pmsg->len >= CPM_MAX_READ) + return -EINVAL; + } + + mutex_lock(&cpm->i2c_mutex); + + /* Reset to use first buffer */ + out_be16(&i2c_ram->rbptr, in_be16(&i2c_ram->rbase)); + out_be16(&i2c_ram->tbptr, in_be16(&i2c_ram->tbase)); + + tbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->tbase)); + rbdf = (cbd_t *) cpm_muram_addr(in_be16(&i2c_ram->rbase)); + + tptr = 0; + rptr = 0; + + while (tptr < num) { + pmsg = &msgs[tptr]; + dev_dbg(&adap->dev, "i2c-algo-cpm.o: " "R: %d T: %d\n", + rptr, tptr); + + cpm_i2c_parse_message(adap, pmsg, num, tptr, rptr); + if (pmsg->flags & I2C_M_RD) + rptr++; + tptr++; + } + /* Start transfer now */ + /* Chip bug, set enable here */ + out_8(&i2c_reg->i2cmr, 0x13); /* Enable some interupts */ + out_8(&i2c_reg->i2cer, 0xff); + out_8(&i2c_reg->i2mod, in_8(&i2c_reg->i2mod) | 1); /* Enable */ + /* Begin transmission */ + out_8(&i2c_reg->i2com, in_8(&i2c_reg->i2com) | 0x80); + + tptr = 0; + rptr = 0; + + while (tptr < num) { + /* Check for outstanding messages */ + dev_dbg(&adap->dev, "test ready.\n"); + if (!(tbdf[tptr].cbd_sc & BD_I2C_READY)) { + dev_dbg(&adap->dev, "ready.\n"); + rmsg = &msgs[tptr]; + ret = cpm_i2c_check_message(adap, rmsg, tptr, rptr); + tptr++; + if (rmsg->flags & I2C_M_RD) + rptr++; + if (ret) { + cpm_i2c_force_close(adap); + mutex_unlock(&cpm->i2c_mutex); + return ret; + } + } else { + dev_dbg(&adap->dev, "not ready.\n"); + ret = wait_event_interruptible_timeout(cpm->i2c_wait, + !(tbdf[tptr].cbd_sc & BD_I2C_READY), 1 * HZ); + if (ret == 0) { + cpm_i2c_force_close(adap); + dev_dbg(&adap->dev, "I2C read: timeout!\n"); + mutex_unlock(&cpm->i2c_mutex); + return -EREMOTEIO; + } + } + } +#ifdef I2C_CHIP_ERRATA + /* Chip errata, clear enable. This is not needed on rev D4 CPUs. + Disabling I2C too early may cause too short stop condition */ + udelay(4); + out_8(&i2c_reg->i2mod, in_8(&i2c_reg->i2mod) | ~1); +#endif + mutex_unlock(&cpm->i2c_mutex); + return (num); +} + +static u32 cpm_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +/* -----exported algorithm data: ------------------------------------- */ + +static struct i2c_algorithm cpm_i2c_algo = { + .master_xfer = cpm_i2c_xfer, + .functionality = cpm_i2c_func, +}; + +/* + * registering functions to load algorithms at runtime + */ +int i2c_cpm_add_bus(struct i2c_adapter *adap) +{ + int res; + + pr_debug("i2c-cpm: hw routines for %s registered.\n", adap->name); + + /* register new adapter to i2c module... */ + + adap->algo = &cpm_i2c_algo; + + res = cpm_i2c_init(adap); + + if (res) + return res; + + return i2c_add_adapter(adap); +} + +int i2c_cpm_del_bus(struct i2c_adapter *adap) +{ + i2c_del_adapter(adap); + + return cpm_i2c_shutdown(adap); +} + +static const struct i2c_adapter cpm_ops = { + .owner = THIS_MODULE, + .name = "i2c-cpm", + .id = I2C_HW_MPC8XX_EPON, + .class = I2C_CLASS_HWMON, +}; + +static int i2c_cpm_setup(struct cpm_i2c *i2c) +{ + struct of_device *ofdev = i2c->ofdev; + const u32 *data; + int len, ret; + void __iomem *i2c_base; + + /* Pointer to Communication Processor + */ + i2c->irq = of_irq_to_resource(ofdev->node, 0, NULL); + if (i2c->irq == NO_IRQ) + return -EINVAL; + + if (of_device_is_compatible(ofdev->node, "fsl,cpm1-i2c")) { + + /* IIC parameter RAM */ + i2c->i2c_ram = of_iomap(ofdev->node, 1); + if (i2c->i2c_ram == NULL) + return -EINVAL; + + /* Check for and use a microcode relocation patch. + */ + i2c->reloc = i2c->i2c_ram->rpbase; + + /* Maybe should use cpm_muram_alloc instead of hardcoding + * this in micropatch.c */ + if (i2c->reloc) { + iounmap(i2c->i2c_ram); + i2c->i2c_ram = cpm_muram_addr(i2c->i2c_ram->rpbase); + } + i2c->version = 1; + } else if (of_device_is_compatible(ofdev->node, "fsl,cpm2-i2c")) { + i2c_base = of_iomap(ofdev->node, 1); + if (i2c_base == NULL) + return -EINVAL; + i2c->i2c_addr = cpm_muram_alloc(0x30, 64); + i2c->i2c_ram = cpm_muram_addr(i2c->i2c_addr); + out_be16(i2c_base, i2c->i2c_addr); + iounmap(i2c_base); + i2c->version = 2; + } else + return -EINVAL; + + /* I2C control/status registers */ + i2c->i2c_reg = of_iomap(ofdev->node, 0); + if (i2c->i2c_reg == NULL) { + ret = -EINVAL; + goto out_ram; + } + + /* Allocate space for two transmit and two receive buffer + * descriptors in the DP ram. + */ + i2c->dp_addr = cpm_muram_alloc(sizeof(cbd_t) * 4, 8); + if (!i2c->dp_addr) { + ret = -ENOMEM; + goto out_reg; + } + + data = of_get_property(ofdev->node, "fsl,cpm-command", &len); + if (!data || len != 4) { + ret = -EINVAL; + goto out_muram; + } + + i2c->cp_command = *data; + return 0; + +out_muram: + cpm_muram_free(i2c->dp_addr); +out_reg: + iounmap(i2c->i2c_reg); +out_ram: + if ((i2c->version == 1) && (!i2c->reloc)) + iounmap(i2c->i2c_ram); + if (i2c->version == 2) + cpm_muram_free(i2c->i2c_addr); + return ret; +} + +static void i2c_cpm_release(struct cpm_i2c *i2c) +{ + cpm_muram_free(i2c->dp_addr); + iounmap(i2c->i2c_reg); + + if ((i2c->version == 1) && (!i2c->reloc)) + iounmap(i2c->i2c_ram); + if (i2c->version == 2) + cpm_muram_free(i2c->i2c_addr); + + return; +} + +static int i2c_cpm_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + int result; + struct cpm_i2c *i2c; + + i2c = kzalloc(sizeof(struct cpm_i2c), GFP_KERNEL); + if (!i2c) + return -ENOMEM; + + i2c->ofdev = ofdev; + + result = i2c_cpm_setup(i2c); + if (result) { + printk(KERN_ERR "i2c-cpm: Unable to register resources\n"); + goto out; + } + + dev_set_drvdata(&ofdev->dev, i2c); + + i2c->adap = cpm_ops; + i2c_set_adapdata(&i2c->adap, i2c); + i2c->adap.dev.parent = &ofdev->dev; + + result = i2c_cpm_add_bus(&i2c->adap); + if (result < 0) { + printk(KERN_ERR "i2c-cpm: Unable to register with I2C\n"); + goto out; + } + return 0; + +out: + kfree(i2c); + return result; +} + +static int i2c_cpm_remove(struct of_device *ofdev) +{ + struct cpm_i2c *i2c = dev_get_drvdata(&ofdev->dev); + + i2c_cpm_del_bus(&i2c->adap); + dev_set_drvdata(&ofdev->dev, NULL); + + i2c_cpm_release(i2c); + kfree(i2c); + return 0; +} + +static struct of_device_id i2c_cpm_match[] = { + { + .compatible = "fsl,cpm-i2c", + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, i2c_cpm_match); + +static struct of_platform_driver i2c_cpm_driver = { + .name = "fsl-i2c-cpm", + .match_table = i2c_cpm_match, + .probe = i2c_cpm_probe, + .remove = i2c_cpm_remove, +}; + +static int __init i2c_cpm_init(void) +{ + return of_register_platform_driver(&i2c_cpm_driver); +} + +static void __exit i2c_cpm_exit(void) +{ + of_unregister_platform_driver(&i2c_cpm_driver); +} + +module_init(i2c_cpm_init); +module_exit(i2c_cpm_exit); + +MODULE_AUTHOR("Dan Malek "); +MODULE_DESCRIPTION("I2C-Bus adapter routines for CPM boards"); +MODULE_LICENSE("GPL"); -- 1.5.3.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/