hw/misc/pca9552: Trace GPIO High/Low events
Add a trivial representation of the PCA9552 GPIOs. Example booting obmc-phosphor-image: $ qemu-system-arm -M witherspoon-bmc -trace pca955x_gpio_status 1592689902.327837:pca955x_gpio_status pca-unspecified GPIOs 0-15 [*...............] 1592689902.329934:pca955x_gpio_status pca-unspecified GPIOs 0-15 [**..............] 1592689902.330717:pca955x_gpio_status pca-unspecified GPIOs 0-15 [***.............] 1592689902.331431:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****............] 1592689902.332163:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........*..] 1592689902.332888:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........**.] 1592689902.333629:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........***] 1592690032.793289:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........*.*] 1592690033.303163:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........***] 1592690033.812962:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........*.*] 1592690034.323234:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........***] 1592690034.832922:pca955x_gpio_status pca-unspecified GPIOs 0-15 [****.........*.*] We notice the GPIO #14 (front-power LED) starts to blink. This LED is described in the witherspoon device-tree [*]: front-power { retain-state-shutdown; default-state = "keep"; gpios = <&pca0 14 GPIO_ACTIVE_LOW>; }; [*] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts?id=b1f9be9392f0#n140 Suggested-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Cédric Le Goater <clg@kaod.org> Message-id: 20200623072723.6324-7-f4bug@amsat.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
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@ -13,12 +13,14 @@
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#include "qemu/osdep.h"
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "qemu/log.h"
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#include "qemu/module.h"
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#include "qemu/module.h"
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#include "qemu/bitops.h"
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#include "hw/qdev-properties.h"
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#include "hw/qdev-properties.h"
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#include "hw/misc/pca9552.h"
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#include "hw/misc/pca9552.h"
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#include "hw/misc/pca9552_regs.h"
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#include "hw/misc/pca9552_regs.h"
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#include "migration/vmstate.h"
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#include "migration/vmstate.h"
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#include "qapi/error.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "qapi/visitor.h"
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#include "trace.h"
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typedef struct PCA955xClass {
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typedef struct PCA955xClass {
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/*< private >*/
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/*< private >*/
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@ -49,6 +51,39 @@ static uint8_t pca955x_pin_get_config(PCA955xState *s, int pin)
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return extract32(s->regs[reg], shift, 2);
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return extract32(s->regs[reg], shift, 2);
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}
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}
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/* Return INPUT status (bit #N belongs to GPIO #N) */
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static uint16_t pca955x_pins_get_status(PCA955xState *s)
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{
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return (s->regs[PCA9552_INPUT1] << 8) | s->regs[PCA9552_INPUT0];
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}
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static void pca955x_display_pins_status(PCA955xState *s,
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uint16_t previous_pins_status)
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{
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PCA955xClass *k = PCA955X_GET_CLASS(s);
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uint16_t pins_status, pins_changed;
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int i;
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pins_status = pca955x_pins_get_status(s);
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pins_changed = previous_pins_status ^ pins_status;
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if (!pins_changed) {
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return;
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}
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if (trace_event_get_state_backends(TRACE_PCA955X_GPIO_STATUS)) {
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char *buf = g_newa(char, k->pin_count + 1);
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for (i = 0; i < k->pin_count; i++) {
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if (extract32(pins_status, i, 1)) {
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buf[i] = '*';
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} else {
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buf[i] = '.';
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}
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}
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buf[i] = '\0';
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trace_pca955x_gpio_status(s->description, buf);
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}
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}
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static void pca955x_update_pin_input(PCA955xState *s)
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static void pca955x_update_pin_input(PCA955xState *s)
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{
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{
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PCA955xClass *k = PCA955X_GET_CLASS(s);
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PCA955xClass *k = PCA955X_GET_CLASS(s);
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@ -98,6 +133,8 @@ static uint8_t pca955x_read(PCA955xState *s, uint8_t reg)
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static void pca955x_write(PCA955xState *s, uint8_t reg, uint8_t data)
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static void pca955x_write(PCA955xState *s, uint8_t reg, uint8_t data)
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{
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{
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uint16_t pins_status;
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switch (reg) {
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switch (reg) {
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case PCA9552_PSC0:
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case PCA9552_PSC0:
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case PCA9552_PWM0:
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case PCA9552_PWM0:
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@ -110,8 +147,10 @@ static void pca955x_write(PCA955xState *s, uint8_t reg, uint8_t data)
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case PCA9552_LS1:
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case PCA9552_LS1:
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case PCA9552_LS2:
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case PCA9552_LS2:
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case PCA9552_LS3:
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case PCA9552_LS3:
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pins_status = pca955x_pins_get_status(s);
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s->regs[reg] = data;
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s->regs[reg] = data;
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pca955x_update_pin_input(s);
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pca955x_update_pin_input(s);
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pca955x_display_pins_status(s, pins_status);
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break;
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break;
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case PCA9552_INPUT0:
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case PCA9552_INPUT0:
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@ -209,3 +209,6 @@ via1_adb_poll(uint8_t data, const char *vadbint, int status, int index, int size
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# grlib_ahb_apb_pnp.c
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# grlib_ahb_apb_pnp.c
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grlib_ahb_pnp_read(uint64_t addr, uint32_t value) "AHB PnP read addr:0x%03"PRIx64" data:0x%08x"
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grlib_ahb_pnp_read(uint64_t addr, uint32_t value) "AHB PnP read addr:0x%03"PRIx64" data:0x%08x"
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grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB PnP read addr:0x%03"PRIx64" data:0x%08x"
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grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB PnP read addr:0x%03"PRIx64" data:0x%08x"
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# pca9552.c
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pca955x_gpio_status(const char *description, const char *buf) "%s GPIOs 0-15 [%s]"
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