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path: root/drivers/media/pci/mantis/mantis_i2c.c
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Diffstat (limited to 'drivers/media/pci/mantis/mantis_i2c.c')
-rw-r--r--drivers/media/pci/mantis/mantis_i2c.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/drivers/media/pci/mantis/mantis_i2c.c b/drivers/media/pci/mantis/mantis_i2c.c
new file mode 100644
index 000000000..4ff6022ad
--- /dev/null
+++ b/drivers/media/pci/mantis/mantis_i2c.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ Mantis PCI bridge driver
+
+ Copyright (C) Manu Abraham (abraham.manu@gmail.com)
+
+*/
+
+#include <asm/io.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/i2c.h>
+
+#include <media/dmxdev.h>
+#include <media/dvbdev.h>
+#include <media/dvb_demux.h>
+#include <media/dvb_frontend.h>
+#include <media/dvb_net.h>
+
+#include "mantis_common.h"
+#include "mantis_reg.h"
+#include "mantis_i2c.h"
+
+#define TRIALS 10000
+
+static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg)
+{
+ u32 rxd, i, stat, trials;
+
+ dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
+ __func__, msg->addr);
+
+ for (i = 0; i < msg->len; i++) {
+ rxd = (msg->addr << 25) | (1 << 24)
+ | MANTIS_I2C_RATE_3
+ | MANTIS_I2C_STOP
+ | MANTIS_I2C_PGMODE;
+
+ if (i == (msg->len - 1))
+ rxd &= ~MANTIS_I2C_STOP;
+
+ mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
+ mmwrite(rxd, MANTIS_I2CDATA_CTL);
+
+ /* wait for xfer completion */
+ for (trials = 0; trials < TRIALS; trials++) {
+ stat = mmread(MANTIS_INT_STAT);
+ if (stat & MANTIS_INT_I2CDONE)
+ break;
+ }
+
+ dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
+
+ /* wait for xfer completion */
+ for (trials = 0; trials < TRIALS; trials++) {
+ stat = mmread(MANTIS_INT_STAT);
+ if (stat & MANTIS_INT_I2CRACK)
+ break;
+ }
+
+ dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
+
+ rxd = mmread(MANTIS_I2CDATA_CTL);
+ msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
+ dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
+ }
+ dprintk(MANTIS_INFO, 0, "]\n");
+
+ return 0;
+}
+
+static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg)
+{
+ int i;
+ u32 txd = 0, stat, trials;
+
+ dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
+ __func__, msg->addr);
+
+ for (i = 0; i < msg->len; i++) {
+ dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
+ txd = (msg->addr << 25) | (msg->buf[i] << 8)
+ | MANTIS_I2C_RATE_3
+ | MANTIS_I2C_STOP
+ | MANTIS_I2C_PGMODE;
+
+ if (i == (msg->len - 1))
+ txd &= ~MANTIS_I2C_STOP;
+
+ mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
+ mmwrite(txd, MANTIS_I2CDATA_CTL);
+
+ /* wait for xfer completion */
+ for (trials = 0; trials < TRIALS; trials++) {
+ stat = mmread(MANTIS_INT_STAT);
+ if (stat & MANTIS_INT_I2CDONE)
+ break;
+ }
+
+ dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
+
+ /* wait for xfer completion */
+ for (trials = 0; trials < TRIALS; trials++) {
+ stat = mmread(MANTIS_INT_STAT);
+ if (stat & MANTIS_INT_I2CRACK)
+ break;
+ }
+
+ dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
+ }
+ dprintk(MANTIS_INFO, 0, "]\n");
+
+ return 0;
+}
+
+static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
+{
+ int ret = 0, i = 0, trials;
+ u32 stat, data, txd;
+ struct mantis_pci *mantis;
+ struct mantis_hwconfig *config;
+
+ mantis = i2c_get_adapdata(adapter);
+ BUG_ON(!mantis);
+ config = mantis->hwconfig;
+ BUG_ON(!config);
+
+ dprintk(MANTIS_DEBUG, 1, "Messages:%d", num);
+ mutex_lock(&mantis->i2c_lock);
+
+ while (i < num) {
+ /* Byte MODE */
+ if ((config->i2c_mode & MANTIS_BYTE_MODE) &&
+ ((i + 1) < num) &&
+ (msgs[i].len < 2) &&
+ (msgs[i + 1].len < 2) &&
+ (msgs[i + 1].flags & I2C_M_RD)) {
+
+ dprintk(MANTIS_DEBUG, 0, " Byte MODE:\n");
+
+ /* Read operation */
+ txd = msgs[i].addr << 25 | (0x1 << 24)
+ | (msgs[i].buf[0] << 16)
+ | MANTIS_I2C_RATE_3;
+
+ mmwrite(txd, MANTIS_I2CDATA_CTL);
+ /* wait for xfer completion */
+ for (trials = 0; trials < TRIALS; trials++) {
+ stat = mmread(MANTIS_INT_STAT);
+ if (stat & MANTIS_INT_I2CDONE)
+ break;
+ }
+
+ /* check for xfer completion */
+ if (stat & MANTIS_INT_I2CDONE) {
+ /* check xfer was acknowledged */
+ if (stat & MANTIS_INT_I2CRACK) {
+ data = mmread(MANTIS_I2CDATA_CTL);
+ msgs[i + 1].buf[0] = (data >> 8) & 0xff;
+ dprintk(MANTIS_DEBUG, 0, " Byte <%d> RXD=0x%02x [%02x]\n", 0x0, data, msgs[i + 1].buf[0]);
+ } else {
+ /* I/O error */
+ dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
+ ret = -EIO;
+ break;
+ }
+ } else {
+ /* I/O error */
+ dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
+ ret = -EIO;
+ break;
+ }
+ i += 2; /* Write/Read operation in one go */
+ }
+
+ if (i < num) {
+ if (msgs[i].flags & I2C_M_RD)
+ ret = mantis_i2c_read(mantis, &msgs[i]);
+ else
+ ret = mantis_i2c_write(mantis, &msgs[i]);
+
+ i++;
+ if (ret < 0)
+ goto bail_out;
+ }
+
+ }
+
+ mutex_unlock(&mantis->i2c_lock);
+
+ return num;
+
+bail_out:
+ mutex_unlock(&mantis->i2c_lock);
+ return ret;
+}
+
+static u32 mantis_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm mantis_algo = {
+ .master_xfer = mantis_i2c_xfer,
+ .functionality = mantis_i2c_func,
+};
+
+int mantis_i2c_init(struct mantis_pci *mantis)
+{
+ u32 intstat;
+ struct i2c_adapter *i2c_adapter = &mantis->adapter;
+ struct pci_dev *pdev = mantis->pdev;
+
+ init_waitqueue_head(&mantis->i2c_wq);
+ mutex_init(&mantis->i2c_lock);
+ strscpy(i2c_adapter->name, "Mantis I2C", sizeof(i2c_adapter->name));
+ i2c_set_adapdata(i2c_adapter, mantis);
+
+ i2c_adapter->owner = THIS_MODULE;
+ i2c_adapter->algo = &mantis_algo;
+ i2c_adapter->algo_data = NULL;
+ i2c_adapter->timeout = 500;
+ i2c_adapter->retries = 3;
+ i2c_adapter->dev.parent = &pdev->dev;
+
+ mantis->i2c_rc = i2c_add_adapter(i2c_adapter);
+ if (mantis->i2c_rc < 0)
+ return mantis->i2c_rc;
+
+ dprintk(MANTIS_DEBUG, 1, "Initializing I2C ..");
+
+ intstat = mmread(MANTIS_INT_STAT);
+ mmread(MANTIS_INT_MASK);
+ mmwrite(intstat, MANTIS_INT_STAT);
+ dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
+ mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mantis_i2c_init);
+
+int mantis_i2c_exit(struct mantis_pci *mantis)
+{
+ dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
+ mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
+
+ dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
+ i2c_del_adapter(&mantis->adapter);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mantis_i2c_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 09:39:13 +0000