i2c: IHS I2C master driver
authorDirk Eibach <dirk.eibach@gdsys.cc>
Thu, 3 Jul 2014 07:28:18 +0000 (09:28 +0200)
committerTom Rini <trini@ti.com>
Mon, 7 Jul 2014 23:47:18 +0000 (19:47 -0400)
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>
README
drivers/i2c/Makefile
drivers/i2c/ihs_i2c.c [new file with mode: 0644]
include/configs/dlvision-10g.h
include/configs/iocon.h
include/gdsys_fpga.h

diff --git a/README b/README
index 2bc0d3560c7735d87d38df157d03005700b75bd0..082bd2ab1cec242fe5a6d93c788de48129b8159d 100644 (file)
--- a/README
+++ b/README
@@ -2288,6 +2288,21 @@ CBFS (Coreboot Filesystem) support
                    9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
                    with a fix speed from 100000 and the slave addr 0!
 
+               - drivers/i2c/ihs_i2c.c
+                 - activate this driver with CONFIG_SYS_I2C_IHS
+                 - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0
+                 - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0
+                 - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0
+                 - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1
+                 - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1
+                 - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1
+                 - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2
+                 - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2
+                 - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2
+                 - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3
+                 - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3
+                 - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3
+
                additional defines:
 
                CONFIG_SYS_NUM_I2C_BUSES
index e33586d8a6b6ab9b8faa96b5c50ca8eb8d9e6f1a..96bd45d85396493c160b8e94686f6507282e3cde 100644 (file)
@@ -18,6 +18,7 @@ obj-$(CONFIG_SYS_I2C) += i2c_core.o
 obj-$(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 (file)
index 0000000..ecc5856
--- /dev/null
@@ -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
index 78778970f4a51de4aa56fd0c1b425bf3ad6faa3f..05a97bf9989b24d948557c50c450938076e9e7ed 100644 (file)
  */
 #define CONFIG_SYS_I2C_PPC4XX_SPEED_0          100000
 
+#define CONFIG_SYS_I2C_IHS
+#define CONFIG_SYS_I2C_IHS_CH0
+#define CONFIG_SYS_I2C_IHS_SPEED_0             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_0             0x7F
+#define CONFIG_SYS_I2C_IHS_CH1
+#define CONFIG_SYS_I2C_IHS_SPEED_1             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_1             0x7F
+
+#define CONFIG_SYS_SPD_BUS_NUM         2
+
 /* Temp sensor/hwmon/dtt */
+#define CONFIG_SYS_DTT_BUS_NUM 2
 #define CONFIG_DTT_LM63                1       /* National LM63        */
 #define CONFIG_DTT_SENSORS     { 0x4c, 0x4e, 0x18 } /* Sensor addresses */
 #define CONFIG_DTT_PWM_LOOKUPTABLE     \
index 5636f3824083f40418be3e68e5dadcf853385a4b..36b4b5503969960b9c980373fa05a76e99280e82 100644 (file)
 #define CONFIG_SYS_I2C_PPC4XX_CH0
 #define CONFIG_SYS_I2C_PPC4XX_SPEED_0          400000
 #define CONFIG_SYS_I2C_PPC4XX_SLAVE_0          0x7F
+#define CONFIG_SYS_I2C_IHS
 
 #define CONFIG_SYS_I2C_SPEED           400000
+#define CONFIG_SYS_SPD_BUS_NUM         4
 
 #define CONFIG_PCA953X                 /* NXP PCA9554 */
 #define CONFIG_PCA9698                 /* NXP PCA9698 */
 
+#define CONFIG_SYS_I2C_IHS_CH0
+#define CONFIG_SYS_I2C_IHS_SPEED_0             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_0             0x7F
+#define CONFIG_SYS_I2C_IHS_CH1
+#define CONFIG_SYS_I2C_IHS_SPEED_1             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_1             0x7F
+#define CONFIG_SYS_I2C_IHS_CH2
+#define CONFIG_SYS_I2C_IHS_SPEED_2             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_2             0x7F
+#define CONFIG_SYS_I2C_IHS_CH3
+#define CONFIG_SYS_I2C_IHS_SPEED_3             50000
+#define CONFIG_SYS_I2C_IHS_SLAVE_3             0x7F
+
 /*
  * Software (bit-bang) I2C driver configuration
  */
 #define CONFIG_SYS_I2C_SOFT_SPEED_4            50000
 #define CONFIG_SYS_I2C_SOFT_SLAVE_4            0x7F
 
-#define CONFIG_SYS_ICS8N3QV01_I2C              {1, 2, 3, 4}
-#define CONFIG_SYS_CH7301_I2C                  {1, 2, 3, 4}
-#define CONFIG_SYS_DP501_I2C                   {1, 2, 3, 4}
+#define CONFIG_SYS_ICS8N3QV01_I2C              {5, 6, 7, 8}
+#define CONFIG_SYS_CH7301_I2C                  {5, 6, 7, 8}
+#define CONFIG_SYS_DP501_I2C                   {0, 1, 2, 3}
 
 #ifndef __ASSEMBLY__
 void fpga_gpio_set(unsigned int bus, int pin);
@@ -148,8 +163,6 @@ int fpga_gpio_get(unsigned int bus, int pin);
                        fpga_gpio_set(I2C_ADAP_HWNR, 0x0020); \
                else \
                        fpga_gpio_clear(I2C_ADAP_HWNR, 0x0020); \
-               while (!!fpga_gpio_get(I2C_ADAP_HWNR, 0x0020) != !!bit) \
-                       ; \
        } while (0)
 #define I2C_DELAY      udelay(25)      /* 1/4 I2C clock duration */
 
index 85ddbcb93be6c4bed23190a3691d13826e30651d..276a01e744ed8b4914c6dd64130c93212c128abe 100644 (file)
@@ -43,10 +43,12 @@ struct ihs_gpio {
 };
 
 struct ihs_i2c {
-       u16 write_mailbox;
+       u16 interrupt_status;
+       u16 interrupt_enable;
        u16 write_mailbox_ext;
-       u16 read_mailbox;
+       u16 write_mailbox;
        u16 read_mailbox_ext;
+       u16 read_mailbox;
 };
 
 struct ihs_osd {
@@ -84,7 +86,6 @@ struct ihs_fpga {
 #endif
 
 #ifdef CONFIG_IO64
-
 struct ihs_fpga_channel {
        u16 status_int;
        u16 config_int;
@@ -121,9 +122,9 @@ struct ihs_fpga {
        u16 reserved_0[6];      /* 0x0008 */
        struct ihs_gpio gpio;   /* 0x0014 */
        u16 mpc3w_control;      /* 0x001a */
-       u16 reserved_1[19];     /* 0x001c */
-       u16 videocontrol;       /* 0x0042 */
-       u16 reserved_2[14];     /* 0x0044 */
+       u16 reserved_1[18];     /* 0x001c */
+       struct ihs_i2c i2c;     /* 0x0040 */
+       u16 reserved_2[10];     /* 0x004c */
        u16 mc_int;             /* 0x0060 */
        u16 mc_int_en;          /* 0x0062 */
        u16 mc_status;          /* 0x0064 */
@@ -150,15 +151,13 @@ struct ihs_fpga {
        u16 fpga_features;      /* 0x0006 */
        u16 reserved_0[10];     /* 0x0008 */
        u16 extended_interrupt; /* 0x001c */
-       u16 reserved_1[9];      /* 0x001e */
-       struct ihs_i2c i2c;     /* 0x0030 */
-       u16 reserved_2[16];     /* 0x0038 */
+       u16 reserved_1[29];     /* 0x001e */
        u16 mpc3w_control;      /* 0x0058 */
-       u16 reserved_3[34];     /* 0x005a */
-       u16 videocontrol;       /* 0x009e */
-       u16 reserved_4[176];    /* 0x00a0 */
+       u16 reserved_2[3];      /* 0x005a */
+       struct ihs_i2c i2c;     /* 0x0060 */
+       u16 reserved_3[205];    /* 0x0066 */
        struct ihs_osd osd;     /* 0x0200 */
-       u16 reserved_5[761];    /* 0x020e */
+       u16 reserved_4[761];    /* 0x020e */
        u16 videomem[31736];    /* 0x0800 */
 };
 #endif