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Diffstat (limited to 'tests/libi2c-omap.c')
| -rw-r--r-- | tests/libi2c-omap.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/tests/libi2c-omap.c b/tests/libi2c-omap.c new file mode 100644 index 0000000000..9be57e92c4 --- /dev/null +++ b/tests/libi2c-omap.c @@ -0,0 +1,166 @@ +/* + * QTest I2C driver + * + * Copyright (c) 2012 Andreas Färber + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ +#include "libi2c.h" + +#include <glib.h> +#include <string.h> + +#include "qemu/osdep.h" +#include "libqtest.h" + +enum OMAPI2CRegisters { + OMAP_I2C_REV = 0x00, + OMAP_I2C_STAT = 0x08, + OMAP_I2C_CNT = 0x18, + OMAP_I2C_DATA = 0x1c, + OMAP_I2C_CON = 0x24, + OMAP_I2C_SA = 0x2c, +}; + +enum OMAPI2CSTATBits { + OMAP_I2C_STAT_NACK = 1 << 1, + OMAP_I2C_STAT_ARDY = 1 << 2, + OMAP_I2C_STAT_RRDY = 1 << 3, + OMAP_I2C_STAT_XRDY = 1 << 4, + OMAP_I2C_STAT_ROVR = 1 << 11, + OMAP_I2C_STAT_SBD = 1 << 15, +}; + +enum OMAPI2CCONBits { + OMAP_I2C_CON_STT = 1 << 0, + OMAP_I2C_CON_STP = 1 << 1, + OMAP_I2C_CON_TRX = 1 << 9, + OMAP_I2C_CON_MST = 1 << 10, + OMAP_I2C_CON_BE = 1 << 14, + OMAP_I2C_CON_I2C_EN = 1 << 15, +}; + +typedef struct OMAPI2C { + I2CAdapter parent; + + uint64_t addr; +} OMAPI2C; + + +static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr) +{ + uint16_t data = addr; + + memwrite(s->addr + OMAP_I2C_SA, &data, 2); + memread(s->addr + OMAP_I2C_SA, &data, 2); + g_assert_cmphex(data, ==, addr); +} + +static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr, + const uint8_t *buf, uint16_t len) +{ + OMAPI2C *s = (OMAPI2C *)i2c; + uint16_t data; + + omap_i2c_set_slave_addr(s, addr); + + data = len; + memwrite(s->addr + OMAP_I2C_CNT, &data, 2); + + data = OMAP_I2C_CON_I2C_EN | + OMAP_I2C_CON_TRX | + OMAP_I2C_CON_MST | + OMAP_I2C_CON_STT | + OMAP_I2C_CON_STP; + memwrite(s->addr + OMAP_I2C_CON, &data, 2); + memread(s->addr + OMAP_I2C_CON, &data, 2); + g_assert((data & OMAP_I2C_CON_STP) != 0); + + memread(s->addr + OMAP_I2C_STAT, &data, 2); + g_assert((data & OMAP_I2C_STAT_NACK) == 0); + + while (len > 1) { + memread(s->addr + OMAP_I2C_STAT, &data, 2); + g_assert((data & OMAP_I2C_STAT_XRDY) != 0); + + memwrite(s->addr + OMAP_I2C_DATA, buf, 2); + buf = (uint8_t *)buf + 2; + len -= 2; + } + if (len == 1) { + memread(s->addr + OMAP_I2C_STAT, &data, 2); + g_assert((data & OMAP_I2C_STAT_XRDY) != 0); + + memwrite(s->addr + OMAP_I2C_DATA, buf, 1); + } + + memread(s->addr + OMAP_I2C_CON, &data, 2); + g_assert((data & OMAP_I2C_CON_STP) == 0); +} + +static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr, + uint8_t *buf, uint16_t len) +{ + OMAPI2C *s = (OMAPI2C *)i2c; + uint16_t data, stat; + + omap_i2c_set_slave_addr(s, addr); + + data = len; + memwrite(s->addr + OMAP_I2C_CNT, &data, 2); + + data = OMAP_I2C_CON_I2C_EN | + OMAP_I2C_CON_MST | + OMAP_I2C_CON_STT | + OMAP_I2C_CON_STP; + memwrite(s->addr + OMAP_I2C_CON, &data, 2); + memread(s->addr + OMAP_I2C_CON, &data, 2); + g_assert((data & OMAP_I2C_CON_STP) == 0); + + memread(s->addr + OMAP_I2C_STAT, &data, 2); + g_assert((data & OMAP_I2C_STAT_NACK) == 0); + + memread(s->addr + OMAP_I2C_CNT, &data, 2); + g_assert_cmpuint(data, ==, len); + + while (len > 0) { + memread(s->addr + OMAP_I2C_STAT, &data, 2); + g_assert((data & OMAP_I2C_STAT_RRDY) != 0); + g_assert((data & OMAP_I2C_STAT_ROVR) == 0); + + memread(s->addr + OMAP_I2C_DATA, &data, 2); + + memread(s->addr + OMAP_I2C_STAT, &stat, 2); + if (unlikely(len == 1)) { + *buf = data & 0xf; + buf++; + len--; + } else { + memcpy(buf, &data, 2); + buf += 2; + len -= 2; + } + } + + memread(s->addr + OMAP_I2C_CON, &data, 2); + g_assert((data & OMAP_I2C_CON_STP) == 0); +} + +I2CAdapter *omap_i2c_create(uint64_t addr) +{ + OMAPI2C *s = g_malloc0(sizeof(*s)); + I2CAdapter *i2c = (I2CAdapter *)s; + uint16_t data; + + s->addr = addr; + + i2c->send = omap_i2c_send; + i2c->recv = omap_i2c_recv; + + /* verify the mmio address by looking for a known signature */ + memread(addr + OMAP_I2C_REV, &data, 2); + g_assert_cmphex(data, ==, 0x34); + + return i2c; +} |