[U-Boot] [PATCH v2 76/78] i2c: ihs_i2c: Make DM compatible
Mario Six
mario.six at gdsys.cc
Wed Dec 13 07:19:44 UTC 2017
Make the ihs_i2c driver DM-compatible; for legacy boards, the old functions are
retained within #ifdefs.
No board uses the new DM driver yet; this patch only lays the foundation for
future support.
Signed-off-by: Mario Six <mario.six at gdsys.cc>
---
v1 -> v2:
* Use put_unaligned_le32 instead of manual buffer copying
* Make driver live-tree compatible
* Accomodated for FPGA handle changes in (not yet upstreamed) gdsys_soc driver
---
drivers/i2c/ihs_i2c.c | 201 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 198 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/ihs_i2c.c b/drivers/i2c/ihs_i2c.c
index 6fd016339c..c3fddb55f9 100644
--- a/drivers/i2c/ihs_i2c.c
+++ b/drivers/i2c/ihs_i2c.c
@@ -3,19 +3,39 @@
* Dirk Eibach, Guntermann & Drunck GmbH, eibach at gdsys.de
*
* SPDX-License-Identifier: GPL-2.0+
- *
- * NOTE: This driver should be converted to driver model before June 2017.
- * Please see doc/driver-model/i2c-howto.txt for instructions.
*/
#include <common.h>
#include <i2c.h>
+#ifdef CONFIG_DM_I2C
+#include <dm.h>
+#include <ihs_fpga.h>
+#include "../misc/gdsys_soc.h"
+#else
#include <gdsys_fpga.h>
+#endif
#include <asm/unaligned.h>
+#ifdef CONFIG_DM_I2C
+struct ihs_i2c_priv {
+ uint speed;
+ phys_addr_t addr;
+};
+
+enum {
+ REG_INTERRUPT_STATUS = 0x00,
+ REG_INTERRUPT_ENABLE_CONTROL = 0x02,
+ REG_WRITE_MAILBOX_EXT = 0x04,
+ REG_WRITE_MAILBOX = 0x06,
+ REG_READ_MAILBOX_EXT = 0x08,
+ REG_READ_MAILBOX = 0x0A,
+};
+
+#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) \
@@ -40,6 +60,7 @@ DECLARE_GLOBAL_DATA_PTR;
#define I2C_GET_REG(fld, val) \
FPGA_GET_REG(I2C_ADAP_HWNR, i2c0.fld, val)
#endif
+#endif /* CONFIG_DM_I2C */
enum {
I2CINT_ERROR_EV = BIT(13),
@@ -62,33 +83,71 @@ enum {
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;
uint ctr = 0;
+#ifdef CONFIG_DM_I2C
+ struct ihs_i2c_priv *priv = dev_get_priv(dev);
+ struct udevice *fpga;
+ gdsys_soc_get_fpga(dev, &fpga);
+#endif
+
+#ifdef CONFIG_DM_I2C
+ val = fpga_in_le16(fpga,
+ priv->addr + REG_INTERRUPT_STATUS);
+#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;
+#ifdef CONFIG_DM_I2C
+ val = fpga_in_le16(fpga,
+ priv->addr + REG_INTERRUPT_STATUS);
+#else
I2C_GET_REG(interrupt_status, &val);
+#endif
}
return (val & I2CINT_ERROR_EV) ? 1 : 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;
+#ifdef CONFIG_DM_I2C
+ struct ihs_i2c_priv *priv = dev_get_priv(dev);
+ struct udevice *fpga;
+
+ gdsys_soc_get_fpga(dev, &fpga);
+#endif
/* Clear interrupt status */
+#ifdef CONFIG_DM_I2C
+ fpga_out_le16(fpga, priv->addr + REG_INTERRUPT_STATUS,
+ I2CINT_ERROR_EV | I2CINT_RECEIVE_EV | I2CINT_TRANSMIT_EV);
+ val = fpga_in_le16(fpga,
+ priv->addr + REG_INTERRUPT_STATUS);
+#else
I2C_SET_REG(interrupt_status, I2CINT_ERROR_EV
| I2CINT_RECEIVE_EV | I2CINT_TRANSMIT_EV);
I2C_GET_REG(interrupt_status, &val);
+#endif
/* If we want to write and have data, write the bytes to the mailbox */
if (!read && len) {
@@ -96,22 +155,45 @@ static int ihs_i2c_transfer(uchar chip, uchar *buffer, int len, bool read,
if (len > 1)
val |= buffer[1] << 8;
+#ifdef CONFIG_DM_I2C
+ fpga_out_le16(fpga,
+ priv->addr + REG_WRITE_MAILBOX_EXT, val);
+#else
I2C_SET_REG(write_mailbox_ext, val);
+#endif
}
+#ifdef CONFIG_DM_I2C
+ fpga_out_le16(fpga, priv->addr + REG_WRITE_MAILBOX,
+ I2CMB_NATIVE
+ | (read ? I2CMB_READ : I2CMB_WRITE)
+ | (chip << 1)
+ | ((len > 1) ? I2CMB_2BYTE : I2CMB_1BYTE)
+ | (!is_last ? I2CMB_HOLD_BUS : I2CMB_DONT_HOLD_BUS));
+#else
I2C_SET_REG(write_mailbox,
I2CMB_NATIVE
| (read ? 0 : I2CMB_WRITE)
| (chip << 1)
| ((len > 1) ? I2CMB_2BYTE : 0)
| (is_last ? 0 : I2CMB_HOLD_BUS));
+#endif
+#ifdef CONFIG_DM_I2C
+ if (wait_for_int(dev, read))
+#else
if (wait_for_int(read))
+#endif
return 1;
/* If we want to read, get the bytes from the mailbox */
if (read) {
+#ifdef CONFIG_DM_I2C
+ val = fpga_in_le16(fpga,
+ priv->addr + REG_READ_MAILBOX_EXT);
+#else
I2C_GET_REG(read_mailbox_ext, &val);
+#endif
buffer[0] = val & 0xff;
if (len > 1)
buffer[1] = val >> 8;
@@ -120,15 +202,25 @@ static int ihs_i2c_transfer(uchar chip, uchar *buffer, int len, bool read,
return 0;
}
+#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
{
while (alen) {
int transfer = min(alen, 2);
bool is_last = alen <= transfer;
+#ifdef CONFIG_DM_I2C
+ if (ihs_i2c_transfer(dev, chip, addr, transfer, I2COP_WRITE,
+ hold_bus ? false : is_last))
+ return 1;
+#else
if (ihs_i2c_transfer(chip, addr, transfer, I2COP_WRITE,
hold_bus ? false : is_last))
return 1;
+#endif
alen -= transfer;
}
@@ -136,20 +228,36 @@ static int ihs_i2c_address(uchar chip, u8 *addr, int alen, bool hold_bus)
return 0;
}
+#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
{
/* Don't hold the bus if length of data to send/receive is zero */
+#ifdef CONFIG_DM_I2C
+ if (len <= 0 || ihs_i2c_address(dev, chip, addr, alen, len))
+ return 1;
+#else
if (len <= 0 || ihs_i2c_address(chip, addr, alen, len))
return 1;
+#endif
while (len) {
int transfer = min(len, 2);
bool is_last = len <= transfer;
+#ifdef CONFIG_DM_I2C
+ if (ihs_i2c_transfer(dev, chip, buffer, transfer, read,
+ is_last))
+ return 2;
+#else
if (ihs_i2c_transfer(chip, buffer, transfer, read,
is_last))
return 2;
+#endif
buffer += transfer;
len -= transfer;
@@ -158,6 +266,92 @@ static int ihs_i2c_access(struct i2c_adapter *adap, uchar chip, u8 *addr,
return 0;
}
+#ifdef CONFIG_DM_I2C
+
+int ihs_i2c_probe(struct udevice *bus)
+{
+ struct ihs_i2c_priv *priv = dev_get_priv(bus);
+ int addr;
+
+ addr = dev_read_u32_default(bus, "reg", -1);
+
+ priv->addr = addr;
+
+ 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 1;
+
+ 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.", __func__);
+ return -1;
+ }
+
+ 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];
+
+ if (ihs_i2c_transfer(bus, chip_addr, buffer, 0, I2COP_READ, true))
+ return 1;
+
+ 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)
{
#ifdef CONFIG_SYS_I2C_INIT_BOARD
@@ -269,3 +463,4 @@ U_BOOT_I2C_ADAP_COMPLETE(ihs3_1, ihs_i2c_init, ihs_i2c_probe,
CONFIG_SYS_I2C_IHS_SLAVE_3_1, 19)
#endif
#endif
+#endif /* CONFIG_DM_I2C */
--
2.13.6
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