+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2013
- * Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
- *
- * SPDX-License-Identifier: GPL-2.0+
+ * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
*/
#include <common.h>
#include <i2c.h>
+#ifdef CONFIG_DM_I2C
+#include <dm.h>
+#include <regmap.h>
+#else
#include <gdsys_fpga.h>
+#endif
+#include <log.h>
+#include <asm/unaligned.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+#ifdef CONFIG_DM_I2C
+struct ihs_i2c_priv {
+ uint speed;
+ struct regmap *map;
+};
+
+struct ihs_i2c_regs {
+ u16 interrupt_status;
+ u16 interrupt_enable_control;
+ u16 write_mailbox_ext;
+ u16 write_mailbox;
+ u16 read_mailbox_ext;
+ u16 read_mailbox;
+};
+
+#define ihs_i2c_set(map, member, val) \
+ regmap_set(map, struct ihs_i2c_regs, member, val)
+
+#define ihs_i2c_get(map, member, valp) \
+ regmap_get(map, struct ihs_i2c_regs, member, valp)
+#else /* !CONFIG_DM_I2C */
DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+
+#define I2C_SET_REG(fld, val) \
+ do { \
+ if (I2C_ADAP_HWNR & 0x10) \
+ FPGA_SET_REG(I2C_ADAP_HWNR & 0xf, i2c1.fld, val); \
+ else \
+ FPGA_SET_REG(I2C_ADAP_HWNR, i2c0.fld, val); \
+ } while (0)
+#else
+#define I2C_SET_REG(fld, val) \
+ FPGA_SET_REG(I2C_ADAP_HWNR, i2c0.fld, val)
+#endif
+
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+#define I2C_GET_REG(fld, val) \
+ do { \
+ if (I2C_ADAP_HWNR & 0x10) \
+ FPGA_GET_REG(I2C_ADAP_HWNR & 0xf, i2c1.fld, val); \
+ else \
+ FPGA_GET_REG(I2C_ADAP_HWNR, i2c0.fld, val); \
+ } while (0)
+#else
+#define I2C_GET_REG(fld, val) \
+ FPGA_GET_REG(I2C_ADAP_HWNR, i2c0.fld, val)
+#endif
+#endif /* CONFIG_DM_I2C */
+
enum {
- I2CINT_ERROR_EV = 1 << 13,
- I2CINT_TRANSMIT_EV = 1 << 14,
- I2CINT_RECEIVE_EV = 1 << 15,
+ I2CINT_ERROR_EV = BIT(13),
+ I2CINT_TRANSMIT_EV = BIT(14),
+ I2CINT_RECEIVE_EV = BIT(15),
};
enum {
+ I2CMB_READ = 0 << 10,
I2CMB_WRITE = 1 << 10,
+ I2CMB_1BYTE = 0 << 11,
I2CMB_2BYTE = 1 << 11,
+ I2CMB_DONT_HOLD_BUS = 0 << 13,
I2CMB_HOLD_BUS = 1 << 13,
I2CMB_NATIVE = 2 << 14,
};
+enum {
+ I2COP_WRITE = 0,
+ I2COP_READ = 1,
+};
+
+#ifdef CONFIG_DM_I2C
+static int wait_for_int(struct udevice *dev, int read)
+#else
static int wait_for_int(bool read)
+#endif
{
u16 val;
- unsigned int ctr = 0;
+ uint ctr = 0;
+#ifdef CONFIG_DM_I2C
+ struct ihs_i2c_priv *priv = dev_get_priv(dev);
+#endif
- FPGA_GET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, &val);
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_get(priv->map, interrupt_status, &val);
+#else
+ I2C_GET_REG(interrupt_status, &val);
+#endif
+ /* Wait until error or receive/transmit interrupt was raised */
while (!(val & (I2CINT_ERROR_EV
| (read ? I2CINT_RECEIVE_EV : I2CINT_TRANSMIT_EV)))) {
udelay(10);
if (ctr++ > 5000) {
- return 1;
+ debug("%s: timed out\n", __func__);
+ return -ETIMEDOUT;
}
- FPGA_GET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, &val);
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_get(priv->map, interrupt_status, &val);
+#else
+ I2C_GET_REG(interrupt_status, &val);
+#endif
}
- return (val & I2CINT_ERROR_EV) ? 1 : 0;
+ return (val & I2CINT_ERROR_EV) ? -EIO : 0;
}
+#ifdef CONFIG_DM_I2C
+static int ihs_i2c_transfer(struct udevice *dev, uchar chip,
+ uchar *buffer, int len, int read, bool is_last)
+#else
static int ihs_i2c_transfer(uchar chip, uchar *buffer, int len, bool read,
bool is_last)
+#endif
{
u16 val;
+ u16 data;
+ int res;
+#ifdef CONFIG_DM_I2C
+ struct ihs_i2c_priv *priv = dev_get_priv(dev);
+#endif
- FPGA_SET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, I2CINT_ERROR_EV
- | I2CINT_RECEIVE_EV | I2CINT_TRANSMIT_EV);
- FPGA_GET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, &val);
+ /* Clear interrupt status */
+ data = I2CINT_ERROR_EV | I2CINT_RECEIVE_EV | I2CINT_TRANSMIT_EV;
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_set(priv->map, interrupt_status, data);
+ ihs_i2c_get(priv->map, interrupt_status, &val);
+#else
+ I2C_SET_REG(interrupt_status, data);
+ I2C_GET_REG(interrupt_status, &val);
+#endif
+ /* If we want to write and have data, write the bytes to the mailbox */
if (!read && len) {
val = buffer[0];
if (len > 1)
val |= buffer[1] << 8;
- FPGA_SET_REG(I2C_ADAP_HWNR, i2c.write_mailbox_ext, val);
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_set(priv->map, write_mailbox_ext, val);
+#else
+ I2C_SET_REG(write_mailbox_ext, val);
+#endif
}
- FPGA_SET_REG(I2C_ADAP_HWNR, i2c.write_mailbox,
- I2CMB_NATIVE
- | (read ? 0 : I2CMB_WRITE)
- | (chip << 1)
- | ((len > 1) ? I2CMB_2BYTE : 0)
- | (is_last ? 0 : I2CMB_HOLD_BUS));
+ data = I2CMB_NATIVE
+ | (read ? 0 : I2CMB_WRITE)
+ | (chip << 1)
+ | ((len > 1) ? I2CMB_2BYTE : 0)
+ | (is_last ? 0 : I2CMB_HOLD_BUS);
+
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_set(priv->map, write_mailbox, data);
+#else
+ I2C_SET_REG(write_mailbox, data);
+#endif
+
+#ifdef CONFIG_DM_I2C
+ res = wait_for_int(dev, read);
+#else
+ res = wait_for_int(read);
+#endif
+ if (res) {
+ if (res == -ETIMEDOUT)
+ debug("%s: time out while waiting for event\n", __func__);
- if (wait_for_int(read))
- return 1;
+ return res;
+ }
+ /* If we want to read, get the bytes from the mailbox */
if (read) {
- FPGA_GET_REG(I2C_ADAP_HWNR, i2c.read_mailbox_ext, &val);
+#ifdef CONFIG_DM_I2C
+ ihs_i2c_get(priv->map, read_mailbox_ext, &val);
+#else
+ I2C_GET_REG(read_mailbox_ext, &val);
+#endif
buffer[0] = val & 0xff;
if (len > 1)
buffer[1] = val >> 8;
return 0;
}
-static int ihs_i2c_address(uchar chip, uint addr, int alen, bool hold_bus)
+#ifdef CONFIG_DM_I2C
+static int ihs_i2c_send_buffer(struct udevice *dev, uchar chip, u8 *data, int len, bool hold_bus, int read)
+#else
+static int ihs_i2c_send_buffer(uchar chip, u8 *data, int len, bool hold_bus,
+ int read)
+#endif
{
- int shift = (alen-1) * 8;
-
- while (alen) {
- int transfer = min(alen, 2);
- uchar buf[2];
- bool is_last = alen <= transfer;
+ int res;
- buf[0] = addr >> shift;
- if (alen > 1)
- buf[1] = addr >> (shift - 8);
-
- if (ihs_i2c_transfer(chip, buf, transfer, false,
- hold_bus ? false : is_last))
- return 1;
+ while (len) {
+ int transfer = min(len, 2);
+ bool is_last = len <= transfer;
+
+#ifdef CONFIG_DM_I2C
+ res = ihs_i2c_transfer(dev, chip, data, transfer, read,
+ hold_bus ? false : is_last);
+#else
+ res = ihs_i2c_transfer(chip, data, transfer, read,
+ hold_bus ? false : is_last);
+#endif
+ if (res)
+ return res;
- shift -= 16;
- alen -= transfer;
+ data += transfer;
+ len -= transfer;
}
return 0;
}
-static int ihs_i2c_access(struct i2c_adapter *adap, uchar chip, uint addr,
- int alen, uchar *buffer, int len, bool read)
+#ifdef CONFIG_DM_I2C
+static int ihs_i2c_address(struct udevice *dev, uchar chip, u8 *addr, int alen,
+ bool hold_bus)
+#else
+static int ihs_i2c_address(uchar chip, u8 *addr, int alen, bool hold_bus)
+#endif
{
+#ifdef CONFIG_DM_I2C
+ return ihs_i2c_send_buffer(dev, chip, addr, alen, hold_bus, I2COP_WRITE);
+#else
+ return ihs_i2c_send_buffer(chip, addr, alen, hold_bus, I2COP_WRITE);
+#endif
+}
+
+#ifdef CONFIG_DM_I2C
+static int ihs_i2c_access(struct udevice *dev, uchar chip, u8 *addr,
+ int alen, uchar *buffer, int len, int read)
+#else
+static int ihs_i2c_access(struct i2c_adapter *adap, uchar chip, u8 *addr,
+ int alen, uchar *buffer, int len, int read)
+#endif
+{
+ int res;
+
+ /* Don't hold the bus if length of data to send/receive is zero */
if (len <= 0)
- return 1;
+ return -EINVAL;
- if (ihs_i2c_address(chip, addr, alen, !read))
- return 1;
+#ifdef CONFIG_DM_I2C
+ res = ihs_i2c_address(dev, chip, addr, alen, len);
+#else
+ res = ihs_i2c_address(chip, addr, alen, len);
+#endif
+ if (res)
+ return res;
- while (len) {
- int transfer = min(len, 2);
+#ifdef CONFIG_DM_I2C
+ return ihs_i2c_send_buffer(dev, chip, buffer, len, false, read);
+#else
+ return ihs_i2c_send_buffer(chip, buffer, len, false, read);
+#endif
+}
- if (ihs_i2c_transfer(chip, buffer, transfer, read,
- len <= transfer))
- return 1;
+#ifdef CONFIG_DM_I2C
- buffer += transfer;
- addr += transfer;
- len -= transfer;
+int ihs_i2c_probe(struct udevice *bus)
+{
+ struct ihs_i2c_priv *priv = dev_get_priv(bus);
+
+ regmap_init_mem(dev_ofnode(bus), &priv->map);
+
+ return 0;
+}
+
+static int ihs_i2c_set_bus_speed(struct udevice *bus, uint speed)
+{
+ struct ihs_i2c_priv *priv = dev_get_priv(bus);
+
+ if (speed != priv->speed && priv->speed != 0)
+ return -EINVAL;
+
+ priv->speed = speed;
+
+ return 0;
+}
+
+static int ihs_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
+{
+ struct i2c_msg *dmsg, *omsg, dummy;
+
+ memset(&dummy, 0, sizeof(struct i2c_msg));
+
+ /* We expect either two messages (one with an offset and one with the
+ * actucal data) or one message (just data)
+ */
+ if (nmsgs > 2 || nmsgs == 0) {
+ debug("%s: Only one or two messages are supported\n", __func__);
+ return -ENOTSUPP;
}
+ omsg = nmsgs == 1 ? &dummy : msg;
+ dmsg = nmsgs == 1 ? msg : msg + 1;
+
+ if (dmsg->flags & I2C_M_RD)
+ return ihs_i2c_access(bus, dmsg->addr, omsg->buf,
+ omsg->len, dmsg->buf, dmsg->len,
+ I2COP_READ);
+ else
+ return ihs_i2c_access(bus, dmsg->addr, omsg->buf,
+ omsg->len, dmsg->buf, dmsg->len,
+ I2COP_WRITE);
+}
+
+static int ihs_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
+ u32 chip_flags)
+{
+ uchar buffer[2];
+ int res;
+
+ res = ihs_i2c_transfer(bus, chip_addr, buffer, 0, I2COP_READ, true);
+ if (res)
+ return res;
+
return 0;
}
+static const struct dm_i2c_ops ihs_i2c_ops = {
+ .xfer = ihs_i2c_xfer,
+ .probe_chip = ihs_i2c_probe_chip,
+ .set_bus_speed = ihs_i2c_set_bus_speed,
+};
+
+static const struct udevice_id ihs_i2c_ids[] = {
+ { .compatible = "gdsys,ihs_i2cmaster", },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(i2c_ihs) = {
+ .name = "i2c_ihs",
+ .id = UCLASS_I2C,
+ .of_match = ihs_i2c_ids,
+ .probe = ihs_i2c_probe,
+ .priv_auto_alloc_size = sizeof(struct ihs_i2c_priv),
+ .ops = &ihs_i2c_ops,
+};
+
+#else /* CONFIG_DM_I2C */
static void ihs_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
static int ihs_i2c_probe(struct i2c_adapter *adap, uchar chip)
{
uchar buffer[2];
+ int res;
- if (ihs_i2c_transfer(chip, buffer, 0, true, true))
- return 1;
+ res = ihs_i2c_transfer(chip, buffer, 0, I2COP_READ, true);
+ if (res)
+ return res;
return 0;
}
static int ihs_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
int alen, uchar *buffer, int len)
{
- return ihs_i2c_access(adap, chip, addr, alen, buffer, len, true);
+ u8 addr_bytes[4];
+
+ put_unaligned_le32(addr, addr_bytes);
+
+ return ihs_i2c_access(adap, chip, addr_bytes, alen, buffer, len,
+ I2COP_READ);
}
static int ihs_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
int alen, uchar *buffer, int len)
{
- return ihs_i2c_access(adap, chip, addr, alen, buffer, len, false);
+ u8 addr_bytes[4];
+
+ put_unaligned_le32(addr, addr_bytes);
+
+ return ihs_i2c_access(adap, chip, addr_bytes, alen, buffer, len,
+ I2COP_WRITE);
}
static unsigned int ihs_i2c_set_bus_speed(struct i2c_adapter *adap,
- unsigned int speed)
+ unsigned int speed)
{
if (speed != adap->speed)
- return 1;
+ return -EINVAL;
return speed;
}
ihs_i2c_set_bus_speed,
CONFIG_SYS_I2C_IHS_SPEED_0,
CONFIG_SYS_I2C_IHS_SLAVE_0, 0)
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+U_BOOT_I2C_ADAP_COMPLETE(ihs0_1, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_0_1,
+ CONFIG_SYS_I2C_IHS_SLAVE_0_1, 16)
+#endif
#endif
#ifdef CONFIG_SYS_I2C_IHS_CH1
U_BOOT_I2C_ADAP_COMPLETE(ihs1, ihs_i2c_init, ihs_i2c_probe,
ihs_i2c_set_bus_speed,
CONFIG_SYS_I2C_IHS_SPEED_1,
CONFIG_SYS_I2C_IHS_SLAVE_1, 1)
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+U_BOOT_I2C_ADAP_COMPLETE(ihs1_1, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_1_1,
+ CONFIG_SYS_I2C_IHS_SLAVE_1_1, 17)
+#endif
#endif
#ifdef CONFIG_SYS_I2C_IHS_CH2
U_BOOT_I2C_ADAP_COMPLETE(ihs2, ihs_i2c_init, ihs_i2c_probe,
ihs_i2c_set_bus_speed,
CONFIG_SYS_I2C_IHS_SPEED_2,
CONFIG_SYS_I2C_IHS_SLAVE_2, 2)
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+U_BOOT_I2C_ADAP_COMPLETE(ihs2_1, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_2_1,
+ CONFIG_SYS_I2C_IHS_SLAVE_2_1, 18)
+#endif
#endif
#ifdef CONFIG_SYS_I2C_IHS_CH3
U_BOOT_I2C_ADAP_COMPLETE(ihs3, ihs_i2c_init, ihs_i2c_probe,
ihs_i2c_set_bus_speed,
CONFIG_SYS_I2C_IHS_SPEED_3,
CONFIG_SYS_I2C_IHS_SLAVE_3, 3)
+#ifdef CONFIG_SYS_I2C_IHS_DUAL
+U_BOOT_I2C_ADAP_COMPLETE(ihs3_1, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_3_1,
+ CONFIG_SYS_I2C_IHS_SLAVE_3_1, 19)
+#endif
#endif
+#endif /* CONFIG_DM_I2C */
projects / oweals / u-boot.git / blobdiff