i.MX: Add qtest support for I2C device emulator.

This is using a ds1338 RTC chip on the I2C bus. This RTC chip is
not present on the real 3DS PDK board.
Signed-off-by: NJean-Christophe Dubois <jcd@tribudubois.net>
Acked-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: 05601683a2a95c881cbc9f22651a044d969bd0ae.1441057361.git.jcd@tribudubois.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

include/hw/arm/fsl-imx31.h

@@ -23,6 +23,7 @@
 #include "hw/char/imx_serial.h"
 #include "hw/timer/imx_gpt.h"
 #include "hw/timer/imx_epit.h"
+#include "hw/i2c/imx_i2c.h"
 #include "exec/memory.h"
 
 #define TYPE_FSL_IMX31 "fsl,imx31"

tests/Makefile

@@ -201,6 +201,7 @@ check-qtest-sparc64-y = tests/endianness-test$(EXESUF)
 gcov-files-sparc-y += hw/timer/m48t59.c
 gcov-files-sparc64-y += hw/timer/m48t59.c
 check-qtest-arm-y = tests/tmp105-test$(EXESUF)
+check-qtest-arm-y = tests/ds1338-test$(EXESUF)
 gcov-files-arm-y += hw/misc/tmp105.c
 check-qtest-arm-y += tests/virtio-blk-test$(EXESUF)
 gcov-files-arm-y += arm-softmmu/hw/block/virtio-blk.c
@@ -358,6 +359,7 @@ libqos-pc-obj-y = $(libqos-obj-y) tests/libqos/pci-pc.o
 libqos-pc-obj-y += tests/libqos/malloc-pc.o tests/libqos/libqos-pc.o
 libqos-pc-obj-y += tests/libqos/ahci.o
 libqos-omap-obj-y = $(libqos-obj-y) tests/libqos/i2c-omap.o
+libqos-imx-obj-y = $(libqos-obj-y) tests/libqos/i2c-imx.o
 libqos-usb-obj-y = $(libqos-pc-obj-y) tests/libqos/usb.o
 libqos-virtio-obj-y = $(libqos-pc-obj-y) tests/libqos/virtio.o tests/libqos/virtio-pci.o tests/libqos/virtio-mmio.o tests/libqos/malloc-generic.o
 
@@ -372,6 +374,7 @@ tests/hd-geo-test$(EXESUF): tests/hd-geo-test.o
 tests/boot-order-test$(EXESUF): tests/boot-order-test.o $(libqos-obj-y)
 tests/bios-tables-test$(EXESUF): tests/bios-tables-test.o $(libqos-obj-y)
 tests/tmp105-test$(EXESUF): tests/tmp105-test.o $(libqos-omap-obj-y)
+tests/ds1338-test$(EXESUF): tests/ds1338-test.o $(libqos-imx-obj-y)
 tests/i440fx-test$(EXESUF): tests/i440fx-test.o $(libqos-pc-obj-y)
 tests/q35-test$(EXESUF): tests/q35-test.o $(libqos-pc-obj-y)
 tests/fw_cfg-test$(EXESUF): tests/fw_cfg-test.o $(libqos-pc-obj-y)

tests/ds1338-test.c

+/*
+ * QTest testcase for the DS1338 RTC
+ *
+ * Copyright (c) 2013 Jean-Christophe Dubois
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "libqtest.h"
+#include "libqos/i2c.h"
+
+#include <glib.h>
+
+#define IMX25_I2C_0_BASE 0x43F80000
+
+#define DS1338_ADDR 0x68
+
+static I2CAdapter *i2c;
+static uint8_t addr;
+
+static inline uint8_t bcd2bin(uint8_t x)
+{
+    return ((x) & 0x0f) + ((x) >> 4) * 10;
+}
+
+static void send_and_receive(void)
+{
+    uint8_t cmd[1];
+    uint8_t resp[7];
+    time_t now = time(NULL);
+    struct tm *tm_ptr = gmtime(&now);
+
+    /* reset the index in the RTC memory */
+    cmd[0] = 0;
+    i2c_send(i2c, addr, cmd, 1);
+
+    /* retrieve the date */
+    i2c_recv(i2c, addr, resp, 7);
+
+    /* check retrieved time againt local time */
+    g_assert_cmpuint(bcd2bin(resp[4]), == , tm_ptr->tm_mday);
+    g_assert_cmpuint(bcd2bin(resp[5]), == , 1 + tm_ptr->tm_mon);
+    g_assert_cmpuint(2000 + bcd2bin(resp[6]), == , 1900 + tm_ptr->tm_year);
+}
+
+int main(int argc, char **argv)
+{
+    QTestState *s = NULL;
+    int ret;
+
+    g_test_init(&argc, &argv, NULL);
+
+    s = qtest_start("-display none -machine imx25_pdk");
+    i2c = imx_i2c_create(IMX25_I2C_0_BASE);
+    addr = DS1338_ADDR;
+
+    qtest_add_func("/ds1338/tx-rx", send_and_receive);
+
+    ret = g_test_run();
+
+    if (s) {
+        qtest_quit(s);
+    }
+    g_free(i2c);
+
+    return ret;
+}

tests/libqos/i2c-imx.c

+/*
+ * QTest i.MX I2C driver
+ *
+ * Copyright (c) 2013 Jean-Christophe Dubois
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "libqos/i2c.h"
+
+#include <glib.h>
+#include <string.h>
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+
+#include "hw/i2c/imx_i2c.h"
+
+enum IMXI2CDirection {
+    IMX_I2C_READ,
+    IMX_I2C_WRITE,
+};
+
+typedef struct IMXI2C {
+    I2CAdapter parent;
+
+    uint64_t addr;
+} IMXI2C;
+
+
+static void imx_i2c_set_slave_addr(IMXI2C *s, uint8_t addr,
+                                   enum IMXI2CDirection direction)
+{
+    writeb(s->addr + I2DR_ADDR, (addr << 1) |
+           (direction == IMX_I2C_READ ? 1 : 0));
+}
+
+static void imx_i2c_send(I2CAdapter *i2c, uint8_t addr,
+                         const uint8_t *buf, uint16_t len)
+{
+    IMXI2C *s = (IMXI2C *)i2c;
+    uint8_t data;
+    uint8_t status;
+    uint16_t size = 0;
+
+    if (!len) {
+        return;
+    }
+
+    /* set the bus for write */
+    data = I2CR_IEN |
+           I2CR_IIEN |
+           I2CR_MSTA |
+           I2CR_MTX |
+           I2CR_TXAK;
+
+    writeb(s->addr + I2CR_ADDR, data);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IBB) != 0);
+
+    /* set the slave address */
+    imx_i2c_set_slave_addr(s, addr, IMX_I2C_WRITE);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) != 0);
+    g_assert((status & I2SR_RXAK) == 0);
+
+    /* ack the interrupt */
+    writeb(s->addr + I2SR_ADDR, 0);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) == 0);
+
+    while (size < len) {
+        /* check we are still busy */
+        status = readb(s->addr + I2SR_ADDR);
+        g_assert((status & I2SR_IBB) != 0);
+
+        /* write the data */
+        writeb(s->addr + I2DR_ADDR, buf[size]);
+        status = readb(s->addr + I2SR_ADDR);
+        g_assert((status & I2SR_IIF) != 0);
+        g_assert((status & I2SR_RXAK) == 0);
+
+        /* ack the interrupt */
+        writeb(s->addr + I2SR_ADDR, 0);
+        status = readb(s->addr + I2SR_ADDR);
+        g_assert((status & I2SR_IIF) == 0);
+
+        size++;
+    }
+
+    /* release the bus */
+    data &= ~(I2CR_MSTA | I2CR_MTX);
+    writeb(s->addr + I2CR_ADDR, data);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IBB) == 0);
+}
+
+static void imx_i2c_recv(I2CAdapter *i2c, uint8_t addr,
+                         uint8_t *buf, uint16_t len)
+{
+    IMXI2C *s = (IMXI2C *)i2c;
+    uint8_t data;
+    uint8_t status;
+    uint16_t size = 0;
+
+    if (!len) {
+        return;
+    }
+
+    /* set the bus for write */
+    data = I2CR_IEN |
+           I2CR_IIEN |
+           I2CR_MSTA |
+           I2CR_MTX |
+           I2CR_TXAK;
+
+    writeb(s->addr + I2CR_ADDR, data);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IBB) != 0);
+
+    /* set the slave address */
+    imx_i2c_set_slave_addr(s, addr, IMX_I2C_READ);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) != 0);
+    g_assert((status & I2SR_RXAK) == 0);
+
+    /* ack the interrupt */
+    writeb(s->addr + I2SR_ADDR, 0);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) == 0);
+
+    /* set the bus for read */
+    data &= ~I2CR_MTX;
+    /* if only one byte don't ack */
+    if (len != 1) {
+        data &= ~I2CR_TXAK;
+    }
+    writeb(s->addr + I2CR_ADDR, data);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IBB) != 0);
+
+    /* dummy read */
+    readb(s->addr + I2DR_ADDR);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) != 0);
+
+    /* ack the interrupt */
+    writeb(s->addr + I2SR_ADDR, 0);
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IIF) == 0);
+
+    while (size < len) {
+        /* check we are still busy */
+        status = readb(s->addr + I2SR_ADDR);
+        g_assert((status & I2SR_IBB) != 0);
+
+        if (size == (len - 1)) {
+            /* stop the read transaction */
+            data &= ~(I2CR_MSTA | I2CR_MTX);
+        } else {
+            /* ack the data read */
+            data |= I2CR_TXAK;
+        }
+        writeb(s->addr + I2CR_ADDR, data);
+
+        /* read the data */
+        buf[size] = readb(s->addr + I2DR_ADDR);
+
+        if (size != (len - 1)) {
+            status = readb(s->addr + I2SR_ADDR);
+            g_assert((status & I2SR_IIF) != 0);
+
+            /* ack the interrupt */
+            writeb(s->addr + I2SR_ADDR, 0);
+        }
+
+        status = readb(s->addr + I2SR_ADDR);
+        g_assert((status & I2SR_IIF) == 0);
+
+        size++;
+    }
+
+    status = readb(s->addr + I2SR_ADDR);
+    g_assert((status & I2SR_IBB) == 0);
+}
+
+I2CAdapter *imx_i2c_create(uint64_t addr)
+{
+    IMXI2C *s = g_malloc0(sizeof(*s));
+    I2CAdapter *i2c = (I2CAdapter *)s;
+
+    s->addr = addr;
+
+    i2c->send = imx_i2c_send;
+    i2c->recv = imx_i2c_recv;
+
+    return i2c;
+}

tests/libqos/i2c.h

@@ -27,4 +27,7 @@ void i2c_recv(I2CAdapter *i2c, uint8_t addr,
 /* libi2c-omap.c */
 I2CAdapter *omap_i2c_create(uint64_t addr);
 
+/* libi2c-imx.c */
+I2CAdapter *imx_i2c_create(uint64_t addr);
+
 #endif