Commit 5141d415 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Peter Maydell
Browse files

misc: add pca9552 LED blinker model

Specs are available here :

    https://www.nxp.com/docs/en/application-note/AN264.pdf



This is a simple model supporting the basic registers for led and GPIO
mode. The device also supports two blinking rates but not the model
yet.
Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180530064049.27976-7-clg@kaod.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 3d165f12
......@@ -16,6 +16,7 @@ CONFIG_TSC2005=y
CONFIG_LM832X=y
CONFIG_TMP105=y
CONFIG_TMP421=y
CONFIG_PCA9552=y
CONFIG_STELLARIS=y
CONFIG_STELLARIS_INPUT=y
CONFIG_STELLARIS_ENET=y
......
......@@ -7,6 +7,7 @@ common-obj-$(CONFIG_SGA) += sga.o
common-obj-$(CONFIG_ISA_TESTDEV) += pc-testdev.o
common-obj-$(CONFIG_PCI_TESTDEV) += pci-testdev.o
common-obj-$(CONFIG_EDU) += edu.o
common-obj-$(CONFIG_PCA9552) += pca9552.o
common-obj-y += unimp.o
common-obj-$(CONFIG_FW_CFG_DMA) += vmcoreinfo.o
......
/*
* PCA9552 I2C LED blinker
*
* https://www.nxp.com/docs/en/application-note/AN264.pdf
*
* Copyright (c) 2017-2018, IBM Corporation.
*
* 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 "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/hw.h"
#include "hw/misc/pca9552.h"
#include "hw/misc/pca9552_regs.h"
#define PCA9552_LED_ON 0x0
#define PCA9552_LED_OFF 0x1
#define PCA9552_LED_PWM0 0x2
#define PCA9552_LED_PWM1 0x3
static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin)
{
uint8_t reg = PCA9552_LS0 + (pin / 4);
uint8_t shift = (pin % 4) << 1;
return extract32(s->regs[reg], shift, 2);
}
static void pca9552_update_pin_input(PCA9552State *s)
{
int i;
for (i = 0; i < s->nr_leds; i++) {
uint8_t input_reg = PCA9552_INPUT0 + (i / 8);
uint8_t input_shift = (i % 8);
uint8_t config = pca9552_pin_get_config(s, i);
switch (config) {
case PCA9552_LED_ON:
s->regs[input_reg] |= 1 << input_shift;
break;
case PCA9552_LED_OFF:
s->regs[input_reg] &= ~(1 << input_shift);
break;
case PCA9552_LED_PWM0:
case PCA9552_LED_PWM1:
/* TODO */
default:
break;
}
}
}
static uint8_t pca9552_read(PCA9552State *s, uint8_t reg)
{
switch (reg) {
case PCA9552_INPUT0:
case PCA9552_INPUT1:
case PCA9552_PSC0:
case PCA9552_PWM0:
case PCA9552_PSC1:
case PCA9552_PWM1:
case PCA9552_LS0:
case PCA9552_LS1:
case PCA9552_LS2:
case PCA9552_LS3:
return s->regs[reg];
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: unexpected read to register %d\n",
__func__, reg);
return 0xFF;
}
}
static void pca9552_write(PCA9552State *s, uint8_t reg, uint8_t data)
{
switch (reg) {
case PCA9552_PSC0:
case PCA9552_PWM0:
case PCA9552_PSC1:
case PCA9552_PWM1:
s->regs[reg] = data;
break;
case PCA9552_LS0:
case PCA9552_LS1:
case PCA9552_LS2:
case PCA9552_LS3:
s->regs[reg] = data;
pca9552_update_pin_input(s);
break;
case PCA9552_INPUT0:
case PCA9552_INPUT1:
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: unexpected write to register %d\n",
__func__, reg);
}
}
/*
* When Auto-Increment is on, the register address is incremented
* after each byte is sent to or received by the device. The index
* rollovers to 0 when the maximum register address is reached.
*/
static void pca9552_autoinc(PCA9552State *s)
{
if (s->pointer != 0xFF && s->pointer & PCA9552_AUTOINC) {
uint8_t reg = s->pointer & 0xf;
reg = (reg + 1) % (s->max_reg + 1);
s->pointer = reg | PCA9552_AUTOINC;
}
}
static int pca9552_recv(I2CSlave *i2c)
{
PCA9552State *s = PCA9552(i2c);
uint8_t ret;
ret = pca9552_read(s, s->pointer & 0xf);
/*
* From the Specs:
*
* Important Note: When a Read sequence is initiated and the
* AI bit is set to Logic Level 1, the Read Sequence MUST
* start by a register different from 0.
*
* I don't know what should be done in this case, so throw an
* error.
*/
if (s->pointer == PCA9552_AUTOINC) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Autoincrement read starting with register 0\n",
__func__);
}
pca9552_autoinc(s);
return ret;
}
static int pca9552_send(I2CSlave *i2c, uint8_t data)
{
PCA9552State *s = PCA9552(i2c);
/* First byte sent by is the register address */
if (s->len == 0) {
s->pointer = data;
s->len++;
} else {
pca9552_write(s, s->pointer & 0xf, data);
pca9552_autoinc(s);
}
return 0;
}
static int pca9552_event(I2CSlave *i2c, enum i2c_event event)
{
PCA9552State *s = PCA9552(i2c);
s->len = 0;
return 0;
}
static const VMStateDescription pca9552_vmstate = {
.name = "PCA9552",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT8(len, PCA9552State),
VMSTATE_UINT8(pointer, PCA9552State),
VMSTATE_UINT8_ARRAY(regs, PCA9552State, PCA9552_NR_REGS),
VMSTATE_I2C_SLAVE(i2c, PCA9552State),
VMSTATE_END_OF_LIST()
}
};
static void pca9552_reset(DeviceState *dev)
{
PCA9552State *s = PCA9552(dev);
s->regs[PCA9552_PSC0] = 0xFF;
s->regs[PCA9552_PWM0] = 0x80;
s->regs[PCA9552_PSC1] = 0xFF;
s->regs[PCA9552_PWM1] = 0x80;
s->regs[PCA9552_LS0] = 0x55; /* all OFF */
s->regs[PCA9552_LS1] = 0x55;
s->regs[PCA9552_LS2] = 0x55;
s->regs[PCA9552_LS3] = 0x55;
pca9552_update_pin_input(s);
s->pointer = 0xFF;
s->len = 0;
}
static void pca9552_initfn(Object *obj)
{
PCA9552State *s = PCA9552(obj);
/* If support for the other PCA955X devices are implemented, these
* constant values might be part of class structure describing the
* PCA955X device
*/
s->max_reg = PCA9552_LS3;
s->nr_leds = 16;
}
static void pca9552_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
k->event = pca9552_event;
k->recv = pca9552_recv;
k->send = pca9552_send;
dc->reset = pca9552_reset;
dc->vmsd = &pca9552_vmstate;
}
static const TypeInfo pca9552_info = {
.name = TYPE_PCA9552,
.parent = TYPE_I2C_SLAVE,
.instance_init = pca9552_initfn,
.instance_size = sizeof(PCA9552State),
.class_init = pca9552_class_init,
};
static void pca9552_register_types(void)
{
type_register_static(&pca9552_info);
}
type_init(pca9552_register_types)
/*
* PCA9552 I2C LED blinker
*
* Copyright (c) 2017-2018, IBM Corporation.
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef PCA9552_H
#define PCA9552_H
#include "hw/i2c/i2c.h"
#define TYPE_PCA9552 "pca9552"
#define PCA9552(obj) OBJECT_CHECK(PCA9552State, (obj), TYPE_PCA9552)
#define PCA9552_NR_REGS 10
typedef struct PCA9552State {
/*< private >*/
I2CSlave i2c;
/*< public >*/
uint8_t len;
uint8_t pointer;
uint8_t regs[PCA9552_NR_REGS];
uint8_t max_reg;
uint8_t nr_leds;
} PCA9552State;
#endif
/*
* PCA9552 I2C LED blinker registers
*
* Copyright (c) 2017-2018, IBM Corporation.
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef PCA9552_REGS_H
#define PCA9552_REGS_H
/*
* Bits [0:3] are used to address a specific register.
*/
#define PCA9552_INPUT0 0 /* read only input register 0 */
#define PCA9552_INPUT1 1 /* read only input register 1 */
#define PCA9552_PSC0 2 /* read/write frequency prescaler 0 */
#define PCA9552_PWM0 3 /* read/write PWM register 0 */
#define PCA9552_PSC1 4 /* read/write frequency prescaler 1 */
#define PCA9552_PWM1 5 /* read/write PWM register 1 */
#define PCA9552_LS0 6 /* read/write LED0 to LED3 selector */
#define PCA9552_LS1 7 /* read/write LED4 to LED7 selector */
#define PCA9552_LS2 8 /* read/write LED8 to LED11 selector */
#define PCA9552_LS3 9 /* read/write LED12 to LED15 selector */
/*
* Bit [4] is used to activate the Auto-Increment option of the
* register address
*/
#define PCA9552_AUTOINC (1 << 4)
#endif
......@@ -373,6 +373,7 @@ check-qtest-sparc64-y += tests/prom-env-test$(EXESUF)
check-qtest-sparc64-y += tests/boot-serial-test$(EXESUF)
check-qtest-arm-y = tests/tmp105-test$(EXESUF)
check-qtest-arm-y += tests/pca9552-test$(EXESUF)
check-qtest-arm-y += tests/ds1338-test$(EXESUF)
check-qtest-arm-y += tests/m25p80-test$(EXESUF)
gcov-files-arm-y += hw/misc/tmp105.c
......@@ -778,6 +779,7 @@ tests/bios-tables-test$(EXESUF): tests/bios-tables-test.o \
tests/boot-sector.o tests/acpi-utils.o $(libqos-obj-y)
tests/pxe-test$(EXESUF): tests/pxe-test.o tests/boot-sector.o $(libqos-obj-y)
tests/tmp105-test$(EXESUF): tests/tmp105-test.o $(libqos-omap-obj-y)
tests/pca9552-test$(EXESUF): tests/pca9552-test.o $(libqos-omap-obj-y)
tests/ds1338-test$(EXESUF): tests/ds1338-test.o $(libqos-imx-obj-y)
tests/m25p80-test$(EXESUF): tests/m25p80-test.o
tests/i440fx-test$(EXESUF): tests/i440fx-test.o $(libqos-pc-obj-y)
......
......@@ -21,6 +21,8 @@ struct I2CAdapter {
QTestState *qts;
};
#define OMAP2_I2C_1_BASE 0x48070000
void i2c_send(I2CAdapter *i2c, uint8_t addr,
const uint8_t *buf, uint16_t len);
void i2c_recv(I2CAdapter *i2c, uint8_t addr,
......
/*
* QTest testcase for the PCA9552 LED blinker
*
* Copyright (c) 2017-2018, IBM Corporation.
*
* 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 "qemu/osdep.h"
#include "libqtest.h"
#include "libqos/i2c.h"
#include "hw/misc/pca9552_regs.h"
#define PCA9552_TEST_ID "pca9552-test"
#define PCA9552_TEST_ADDR 0x60
static I2CAdapter *i2c;
static uint8_t pca9552_get8(I2CAdapter *i2c, uint8_t addr, uint8_t reg)
{
uint8_t resp[1];
i2c_send(i2c, addr, &reg, 1);
i2c_recv(i2c, addr, resp, 1);
return resp[0];
}
static void pca9552_set8(I2CAdapter *i2c, uint8_t addr, uint8_t reg,
uint8_t value)
{
uint8_t cmd[2];
uint8_t resp[1];
cmd[0] = reg;
cmd[1] = value;
i2c_send(i2c, addr, cmd, 2);
i2c_recv(i2c, addr, resp, 1);
g_assert_cmphex(resp[0], ==, cmd[1]);
}
static void receive_autoinc(void)
{
uint8_t resp;
uint8_t reg = PCA9552_LS0 | PCA9552_AUTOINC;
i2c_send(i2c, PCA9552_TEST_ADDR, &reg, 1);
/* PCA9552_LS0 */
i2c_recv(i2c, PCA9552_TEST_ADDR, &resp, 1);
g_assert_cmphex(resp, ==, 0x54);
/* PCA9552_LS1 */
i2c_recv(i2c, PCA9552_TEST_ADDR, &resp, 1);
g_assert_cmphex(resp, ==, 0x55);
/* PCA9552_LS2 */
i2c_recv(i2c, PCA9552_TEST_ADDR, &resp, 1);
g_assert_cmphex(resp, ==, 0x55);
/* PCA9552_LS3 */
i2c_recv(i2c, PCA9552_TEST_ADDR, &resp, 1);
g_assert_cmphex(resp, ==, 0x54);
}
static void send_and_receive(void)
{
uint8_t value;
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_LS0);
g_assert_cmphex(value, ==, 0x55);
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_INPUT0);
g_assert_cmphex(value, ==, 0x0);
/* Switch on LED 0 */
pca9552_set8(i2c, PCA9552_TEST_ADDR, PCA9552_LS0, 0x54);
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_LS0);
g_assert_cmphex(value, ==, 0x54);
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_INPUT0);
g_assert_cmphex(value, ==, 0x01);
/* Switch on LED 12 */
pca9552_set8(i2c, PCA9552_TEST_ADDR, PCA9552_LS3, 0x54);
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_LS3);
g_assert_cmphex(value, ==, 0x54);
value = pca9552_get8(i2c, PCA9552_TEST_ADDR, PCA9552_INPUT1);
g_assert_cmphex(value, ==, 0x10);
}
int main(int argc, char **argv)
{
QTestState *s = NULL;
int ret;
g_test_init(&argc, &argv, NULL);
s = qtest_start("-machine n800 "
"-device pca9552,bus=i2c-bus.0,id=" PCA9552_TEST_ID
",address=0x60");
i2c = omap_i2c_create(s, OMAP2_I2C_1_BASE);
qtest_add_func("/pca9552/tx-rx", send_and_receive);
qtest_add_func("/pca9552/rx-autoinc", receive_autoinc);
ret = g_test_run();
if (s) {
qtest_quit(s);
}
g_free(i2c);
return ret;
}
......@@ -14,8 +14,6 @@
#include "qapi/qmp/qdict.h"
#include "hw/misc/tmp105_regs.h"
#define OMAP2_I2C_1_BASE 0x48070000
#define TMP105_TEST_ID "tmp105-test"
#define TMP105_TEST_ADDR 0x49
......
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