// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Mantis PCI bridge driver
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Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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*/
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#include <asm/io.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/i2c.h>
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#include <media/dmxdev.h>
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#include <media/dvbdev.h>
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#include <media/dvb_demux.h>
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#include <media/dvb_frontend.h>
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#include <media/dvb_net.h>
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#include "mantis_common.h"
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#include "mantis_reg.h"
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#include "mantis_i2c.h"
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#define TRIALS 10000
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static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg)
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{
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u32 rxd, i, stat, trials;
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dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
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__func__, msg->addr);
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for (i = 0; i < msg->len; i++) {
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rxd = (msg->addr << 25) | (1 << 24)
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| MANTIS_I2C_RATE_3
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| MANTIS_I2C_STOP
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| MANTIS_I2C_PGMODE;
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if (i == (msg->len - 1))
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rxd &= ~MANTIS_I2C_STOP;
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mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
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mmwrite(rxd, MANTIS_I2CDATA_CTL);
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/* wait for xfer completion */
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for (trials = 0; trials < TRIALS; trials++) {
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stat = mmread(MANTIS_INT_STAT);
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if (stat & MANTIS_INT_I2CDONE)
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break;
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}
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dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
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/* wait for xfer completion */
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for (trials = 0; trials < TRIALS; trials++) {
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stat = mmread(MANTIS_INT_STAT);
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if (stat & MANTIS_INT_I2CRACK)
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break;
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}
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dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
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rxd = mmread(MANTIS_I2CDATA_CTL);
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msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
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dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
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}
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dprintk(MANTIS_INFO, 0, "]\n");
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return 0;
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}
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static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg)
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{
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int i;
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u32 txd = 0, stat, trials;
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dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
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__func__, msg->addr);
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for (i = 0; i < msg->len; i++) {
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dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
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txd = (msg->addr << 25) | (msg->buf[i] << 8)
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| MANTIS_I2C_RATE_3
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| MANTIS_I2C_STOP
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| MANTIS_I2C_PGMODE;
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if (i == (msg->len - 1))
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txd &= ~MANTIS_I2C_STOP;
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mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
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mmwrite(txd, MANTIS_I2CDATA_CTL);
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/* wait for xfer completion */
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for (trials = 0; trials < TRIALS; trials++) {
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stat = mmread(MANTIS_INT_STAT);
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if (stat & MANTIS_INT_I2CDONE)
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break;
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}
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dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
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/* wait for xfer completion */
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for (trials = 0; trials < TRIALS; trials++) {
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stat = mmread(MANTIS_INT_STAT);
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if (stat & MANTIS_INT_I2CRACK)
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break;
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}
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dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
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}
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dprintk(MANTIS_INFO, 0, "]\n");
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return 0;
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}
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static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
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{
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int ret = 0, i = 0, trials;
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u32 stat, data, txd;
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struct mantis_pci *mantis;
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struct mantis_hwconfig *config;
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mantis = i2c_get_adapdata(adapter);
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BUG_ON(!mantis);
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config = mantis->hwconfig;
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BUG_ON(!config);
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dprintk(MANTIS_DEBUG, 1, "Messages:%d", num);
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mutex_lock(&mantis->i2c_lock);
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while (i < num) {
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/* Byte MODE */
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if ((config->i2c_mode & MANTIS_BYTE_MODE) &&
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((i + 1) < num) &&
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(msgs[i].len < 2) &&
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(msgs[i + 1].len < 2) &&
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(msgs[i + 1].flags & I2C_M_RD)) {
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dprintk(MANTIS_DEBUG, 0, " Byte MODE:\n");
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/* Read operation */
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txd = msgs[i].addr << 25 | (0x1 << 24)
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| (msgs[i].buf[0] << 16)
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| MANTIS_I2C_RATE_3;
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mmwrite(txd, MANTIS_I2CDATA_CTL);
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/* wait for xfer completion */
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for (trials = 0; trials < TRIALS; trials++) {
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stat = mmread(MANTIS_INT_STAT);
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if (stat & MANTIS_INT_I2CDONE)
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break;
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}
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/* check for xfer completion */
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if (stat & MANTIS_INT_I2CDONE) {
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/* check xfer was acknowledged */
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if (stat & MANTIS_INT_I2CRACK) {
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data = mmread(MANTIS_I2CDATA_CTL);
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msgs[i + 1].buf[0] = (data >> 8) & 0xff;
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dprintk(MANTIS_DEBUG, 0, " Byte <%d> RXD=0x%02x [%02x]\n", 0x0, data, msgs[i + 1].buf[0]);
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} else {
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/* I/O error */
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dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
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ret = -EIO;
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break;
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}
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} else {
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/* I/O error */
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dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
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ret = -EIO;
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break;
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}
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i += 2; /* Write/Read operation in one go */
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}
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if (i < num) {
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if (msgs[i].flags & I2C_M_RD)
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ret = mantis_i2c_read(mantis, &msgs[i]);
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else
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ret = mantis_i2c_write(mantis, &msgs[i]);
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i++;
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if (ret < 0)
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goto bail_out;
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}
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}
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mutex_unlock(&mantis->i2c_lock);
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return num;
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bail_out:
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mutex_unlock(&mantis->i2c_lock);
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return ret;
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}
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static u32 mantis_i2c_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm mantis_algo = {
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.master_xfer = mantis_i2c_xfer,
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.functionality = mantis_i2c_func,
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};
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int mantis_i2c_init(struct mantis_pci *mantis)
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{
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u32 intstat;
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struct i2c_adapter *i2c_adapter = &mantis->adapter;
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struct pci_dev *pdev = mantis->pdev;
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init_waitqueue_head(&mantis->i2c_wq);
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mutex_init(&mantis->i2c_lock);
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strscpy(i2c_adapter->name, "Mantis I2C", sizeof(i2c_adapter->name));
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i2c_set_adapdata(i2c_adapter, mantis);
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i2c_adapter->owner = THIS_MODULE;
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i2c_adapter->algo = &mantis_algo;
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i2c_adapter->algo_data = NULL;
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i2c_adapter->timeout = 500;
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i2c_adapter->retries = 3;
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i2c_adapter->dev.parent = &pdev->dev;
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mantis->i2c_rc = i2c_add_adapter(i2c_adapter);
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if (mantis->i2c_rc < 0)
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return mantis->i2c_rc;
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dprintk(MANTIS_DEBUG, 1, "Initializing I2C ..");
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intstat = mmread(MANTIS_INT_STAT);
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mmread(MANTIS_INT_MASK);
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mmwrite(intstat, MANTIS_INT_STAT);
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dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
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mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mantis_i2c_init);
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int mantis_i2c_exit(struct mantis_pci *mantis)
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{
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dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
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mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
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dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
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i2c_del_adapter(&mantis->adapter);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mantis_i2c_exit);
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