i2c: IHS I2C master driver
IHS I2C master support was merely a hack in the osd driver.
Now it is a proper u-boot I2C framework driver, supporting the
v2.00 master features.
Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index e33586d..96bd45d 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -18,6 +18,7 @@
obj-$(CONFIG_SYS_I2C_DAVINCI) += davinci_i2c.o
obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o
obj-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o
+obj-$(CONFIG_SYS_I2C_IHS) += ihs_i2c.o
obj-$(CONFIG_SYS_I2C_KONA) += kona_i2c.o
obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o
diff --git a/drivers/i2c/ihs_i2c.c b/drivers/i2c/ihs_i2c.c
new file mode 100644
index 0000000..ecc5856
--- /dev/null
+++ b/drivers/i2c/ihs_i2c.c
@@ -0,0 +1,204 @@
+/*
+ * (C) Copyright 2013
+ * Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <gdsys_fpga.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+ I2CINT_ERROR_EV = 1 << 13,
+ I2CINT_TRANSMIT_EV = 1 << 14,
+ I2CINT_RECEIVE_EV = 1 << 15,
+};
+
+enum {
+ I2CMB_WRITE = 1 << 10,
+ I2CMB_2BYTE = 1 << 11,
+ I2CMB_HOLD_BUS = 1 << 13,
+ I2CMB_NATIVE = 2 << 14,
+};
+
+static int wait_for_int(bool read)
+{
+ u16 val;
+ unsigned int ctr = 0;
+
+ FPGA_GET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, &val);
+ while (!(val & (I2CINT_ERROR_EV
+ | (read ? I2CINT_RECEIVE_EV : I2CINT_TRANSMIT_EV)))) {
+ udelay(10);
+ if (ctr++ > 5000) {
+ printf("I2C timeout\n");
+ return 1;
+ }
+ FPGA_GET_REG(I2C_ADAP_HWNR, i2c.interrupt_status, &val);
+ }
+
+ return (val & I2CINT_ERROR_EV) ? 1 : 0;
+}
+
+static int ihs_i2c_transfer(uchar chip, uchar *buffer, int len, bool read,
+ bool is_last)
+{
+ u16 val;
+
+ 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);
+
+ if (!read && len) {
+ val = buffer[0];
+
+ if (len > 1)
+ val |= buffer[1] << 8;
+ FPGA_SET_REG(I2C_ADAP_HWNR, i2c.write_mailbox_ext, val);
+ }
+
+ 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));
+
+ if (wait_for_int(read))
+ return 1;
+
+ if (read) {
+ FPGA_GET_REG(I2C_ADAP_HWNR, i2c.read_mailbox_ext, &val);
+ 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)
+{
+ int shift = (alen-1) * 8;
+
+ while (alen) {
+ int transfer = MIN(alen, 2);
+ uchar buf[2];
+ bool is_last = alen <= transfer;
+
+ 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;
+
+ shift -= 16;
+ alen -= transfer;
+ }
+
+ return 0;
+}
+
+static int ihs_i2c_access(struct i2c_adapter *adap, uchar chip, uint addr,
+ int alen, uchar *buffer, int len, bool read)
+{
+ if (len <= 0)
+ return 1;
+
+ if (ihs_i2c_address(chip, addr, alen, !read))
+ return 1;
+
+ while (len) {
+ int transfer = MIN(len, 2);
+
+ if (ihs_i2c_transfer(chip, buffer, transfer, read,
+ len <= transfer))
+ return 1;
+
+ buffer += transfer;
+ addr += transfer;
+ len -= transfer;
+ }
+
+ return 0;
+}
+
+
+static void ihs_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
+{
+#ifdef CONFIG_SYS_I2C_INIT_BOARD
+ /*
+ * Call board specific i2c bus reset routine before accessing the
+ * environment, which might be in a chip on that bus. For details
+ * about this problem see doc/I2C_Edge_Conditions.
+ */
+ i2c_init_board();
+#endif
+}
+
+static int ihs_i2c_probe(struct i2c_adapter *adap, uchar chip)
+{
+ uchar buffer[2];
+
+ if (ihs_i2c_transfer(chip, buffer, 0, true, true))
+ return 1;
+
+ 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);
+}
+
+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);
+}
+
+static unsigned int ihs_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int speed)
+{
+ if (speed != adap->speed)
+ return 1;
+ return speed;
+}
+
+/*
+ * Register IHS i2c adapters
+ */
+#ifdef CONFIG_SYS_I2C_IHS_CH0
+U_BOOT_I2C_ADAP_COMPLETE(ihs0, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_0,
+ CONFIG_SYS_I2C_IHS_SLAVE_0, 0)
+#endif
+#ifdef CONFIG_SYS_I2C_IHS_CH1
+U_BOOT_I2C_ADAP_COMPLETE(ihs1, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_1,
+ CONFIG_SYS_I2C_IHS_SLAVE_1, 1)
+#endif
+#ifdef CONFIG_SYS_I2C_IHS_CH2
+U_BOOT_I2C_ADAP_COMPLETE(ihs2, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_2,
+ CONFIG_SYS_I2C_IHS_SLAVE_2, 2)
+#endif
+#ifdef CONFIG_SYS_I2C_IHS_CH3
+U_BOOT_I2C_ADAP_COMPLETE(ihs3, ihs_i2c_init, ihs_i2c_probe,
+ ihs_i2c_read, ihs_i2c_write,
+ ihs_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_IHS_SPEED_3,
+ CONFIG_SYS_I2C_IHS_SLAVE_3, 3)
+#endif