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path: root/drivers/media/pci/ddbridge/ddbridge-i2c.c
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Diffstat (limited to 'drivers/media/pci/ddbridge/ddbridge-i2c.c')
-rw-r--r--drivers/media/pci/ddbridge/ddbridge-i2c.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/media/pci/ddbridge/ddbridge-i2c.c b/drivers/media/pci/ddbridge/ddbridge-i2c.c
new file mode 100644
index 0000000000..c894be1804
--- /dev/null
+++ b/drivers/media/pci/ddbridge/ddbridge-i2c.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ddbridge-i2c.c: Digital Devices bridge i2c driver
+ *
+ * Copyright (C) 2010-2017 Digital Devices GmbH
+ * Ralph Metzler <rjkm@metzlerbros.de>
+ * Marcus Metzler <mocm@metzlerbros.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/timer.h>
+#include <linux/i2c.h>
+#include <linux/swab.h>
+#include <linux/vmalloc.h>
+
+#include "ddbridge.h"
+#include "ddbridge-i2c.h"
+#include "ddbridge-regs.h"
+#include "ddbridge-io.h"
+
+/******************************************************************************/
+
+static int ddb_i2c_cmd(struct ddb_i2c *i2c, u32 adr, u32 cmd)
+{
+ struct ddb *dev = i2c->dev;
+ unsigned long stat;
+ u32 val;
+
+ ddbwritel(dev, (adr << 9) | cmd, i2c->regs + I2C_COMMAND);
+ stat = wait_for_completion_timeout(&i2c->completion, HZ);
+ val = ddbreadl(dev, i2c->regs + I2C_COMMAND);
+ if (stat == 0) {
+ dev_err(dev->dev, "I2C timeout, card %d, port %d, link %u\n",
+ dev->nr, i2c->nr, i2c->link);
+ {
+ u32 istat = ddbreadl(dev, INTERRUPT_STATUS);
+
+ dev_err(dev->dev, "DDBridge IRS %08x\n", istat);
+ if (i2c->link) {
+ u32 listat = ddbreadl(dev,
+ DDB_LINK_TAG(i2c->link) |
+ INTERRUPT_STATUS);
+
+ dev_err(dev->dev, "DDBridge link %u IRS %08x\n",
+ i2c->link, listat);
+ }
+ if (istat & 1) {
+ ddbwritel(dev, istat & 1, INTERRUPT_ACK);
+ } else {
+ u32 mon = ddbreadl(dev,
+ i2c->regs + I2C_MONITOR);
+
+ dev_err(dev->dev, "I2C cmd=%08x mon=%08x\n",
+ val, mon);
+ }
+ }
+ return -EIO;
+ }
+ val &= 0x70000;
+ if (val == 0x20000)
+ dev_err(dev->dev, "I2C bus error\n");
+ if (val)
+ return -EIO;
+ return 0;
+}
+
+static int ddb_i2c_master_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg msg[], int num)
+{
+ struct ddb_i2c *i2c = (struct ddb_i2c *)i2c_get_adapdata(adapter);
+ struct ddb *dev = i2c->dev;
+ u8 addr = 0;
+
+ addr = msg[0].addr;
+ if (msg[0].len > i2c->bsize)
+ return -EIO;
+ switch (num) {
+ case 1:
+ if (msg[0].flags & I2C_M_RD) {
+ ddbwritel(dev, msg[0].len << 16,
+ i2c->regs + I2C_TASKLENGTH);
+ if (ddb_i2c_cmd(i2c, addr, 3))
+ break;
+ ddbcpyfrom(dev, msg[0].buf,
+ i2c->rbuf, msg[0].len);
+ return num;
+ }
+ ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
+ ddbwritel(dev, msg[0].len, i2c->regs + I2C_TASKLENGTH);
+ if (ddb_i2c_cmd(i2c, addr, 2))
+ break;
+ return num;
+ case 2:
+ if ((msg[0].flags & I2C_M_RD) == I2C_M_RD)
+ break;
+ if ((msg[1].flags & I2C_M_RD) != I2C_M_RD)
+ break;
+ if (msg[1].len > i2c->bsize)
+ break;
+ ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
+ ddbwritel(dev, msg[0].len | (msg[1].len << 16),
+ i2c->regs + I2C_TASKLENGTH);
+ if (ddb_i2c_cmd(i2c, addr, 1))
+ break;
+ ddbcpyfrom(dev, msg[1].buf,
+ i2c->rbuf,
+ msg[1].len);
+ return num;
+ default:
+ break;
+ }
+ return -EIO;
+}
+
+static u32 ddb_i2c_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm ddb_i2c_algo = {
+ .master_xfer = ddb_i2c_master_xfer,
+ .functionality = ddb_i2c_functionality,
+};
+
+void ddb_i2c_release(struct ddb *dev)
+{
+ int i;
+ struct ddb_i2c *i2c;
+
+ for (i = 0; i < dev->i2c_num; i++) {
+ i2c = &dev->i2c[i];
+ i2c_del_adapter(&i2c->adap);
+ }
+}
+
+static void i2c_handler(void *priv)
+{
+ struct ddb_i2c *i2c = (struct ddb_i2c *)priv;
+
+ complete(&i2c->completion);
+}
+
+static int ddb_i2c_add(struct ddb *dev, struct ddb_i2c *i2c,
+ const struct ddb_regmap *regmap, int link,
+ int i, int num)
+{
+ struct i2c_adapter *adap;
+
+ i2c->nr = i;
+ i2c->dev = dev;
+ i2c->link = link;
+ i2c->bsize = regmap->i2c_buf->size;
+ i2c->wbuf = DDB_LINK_TAG(link) |
+ (regmap->i2c_buf->base + i2c->bsize * i);
+ i2c->rbuf = i2c->wbuf; /* + i2c->bsize / 2 */
+ i2c->regs = DDB_LINK_TAG(link) |
+ (regmap->i2c->base + regmap->i2c->size * i);
+ ddbwritel(dev, I2C_SPEED_100, i2c->regs + I2C_TIMING);
+ ddbwritel(dev, ((i2c->rbuf & 0xffff) << 16) | (i2c->wbuf & 0xffff),
+ i2c->regs + I2C_TASKADDRESS);
+ init_completion(&i2c->completion);
+
+ adap = &i2c->adap;
+ i2c_set_adapdata(adap, i2c);
+#ifdef I2C_ADAP_CLASS_TV_DIGITAL
+ adap->class = I2C_ADAP_CLASS_TV_DIGITAL | I2C_CLASS_TV_ANALOG;
+#else
+#ifdef I2C_CLASS_TV_ANALOG
+ adap->class = I2C_CLASS_TV_ANALOG;
+#endif
+#endif
+ snprintf(adap->name, I2C_NAME_SIZE, "ddbridge_%02x.%x.%x",
+ dev->nr, i2c->link, i);
+ adap->algo = &ddb_i2c_algo;
+ adap->algo_data = (void *)i2c;
+ adap->dev.parent = dev->dev;
+ return i2c_add_adapter(adap);
+}
+
+int ddb_i2c_init(struct ddb *dev)
+{
+ int stat = 0;
+ u32 i, j, num = 0, l, base;
+ struct ddb_i2c *i2c;
+ struct i2c_adapter *adap;
+ const struct ddb_regmap *regmap;
+
+ for (l = 0; l < DDB_MAX_LINK; l++) {
+ if (!dev->link[l].info)
+ continue;
+ regmap = dev->link[l].info->regmap;
+ if (!regmap || !regmap->i2c)
+ continue;
+ base = regmap->irq_base_i2c;
+ for (i = 0; i < regmap->i2c->num; i++) {
+ if (!(dev->link[l].info->i2c_mask & (1 << i)))
+ continue;
+ i2c = &dev->i2c[num];
+ ddb_irq_set(dev, l, i + base, i2c_handler, i2c);
+ stat = ddb_i2c_add(dev, i2c, regmap, l, i, num);
+ if (stat)
+ break;
+ num++;
+ }
+ }
+ if (stat) {
+ for (j = 0; j < num; j++) {
+ i2c = &dev->i2c[j];
+ adap = &i2c->adap;
+ i2c_del_adapter(adap);
+ }
+ } else {
+ dev->i2c_num = num;
+ }
+
+ return stat;
+}