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soc/amd/common/lpc/espi_util: use enum cb_err type for return values 

Use enum cb_err as return type of all functions that aren't exposed
outside of this compilation unit. The checks if a function has returned
a failure are replaced with checks if the return value isn't CB_SUCCESS
which is equivalent if only those two values are used, but also detects
a failure if any unexpected value would be returned.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: If8c703f62babac31948d0878e91bd31b31bebc01
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60207
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
This commit is contained in:
Felix Held 2021-12-18 00:41:23 +01:00
parent 9e830540ec
commit 4b4114f709
1 changed files with 75 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

144
src/soc/amd/common/block/lpc/espi_util.c
View File

@ -426,7 +426,7 @@ struct espi_cmd {
} __packed; } __packed;
/* Wait up to ESPI_CMD_TIMEOUT_US for hardware to clear DNCMD_STATUS bit. */ /* Wait up to ESPI_CMD_TIMEOUT_US for hardware to clear DNCMD_STATUS bit. */
static int espi_wait_ready(void) static enum cb_err espi_wait_ready(void)
{ {
struct stopwatch sw; struct stopwatch sw;
union espi_txhdr0 hdr0; union espi_txhdr0 hdr0;
@ -435,10 +435,10 @@ static int espi_wait_ready(void)
do { do {
hdr0.val = espi_read32(ESPI_DN_TX_HDR0); hdr0.val = espi_read32(ESPI_DN_TX_HDR0);
if (!hdr0.cmd_sts) if (!hdr0.cmd_sts)
return 0; return CB_SUCCESS;
} while (!stopwatch_expired(&sw)); } while (!stopwatch_expired(&sw));
return -1; return CB_ERR;
} }
/* Clear interrupt status register */ /* Clear interrupt status register */
@ -453,7 +453,7 @@ static void espi_clear_status(void)
* Wait up to ESPI_CMD_TIMEOUT_US for interrupt status register to update after sending a * Wait up to ESPI_CMD_TIMEOUT_US for interrupt status register to update after sending a
* command. * command.
*/ */
static int espi_poll_status(uint32_t *status) static enum cb_err espi_poll_status(uint32_t *status)
{ {
struct stopwatch sw; struct stopwatch sw;
@ -461,12 +461,12 @@ static int espi_poll_status(uint32_t *status)
do { do {
*status = espi_read32(ESPI_SLAVE0_INT_STS); *status = espi_read32(ESPI_SLAVE0_INT_STS);
if (*status) if (*status)
return 0; return CB_SUCCESS;
} while (!stopwatch_expired(&sw)); } while (!stopwatch_expired(&sw));
printk(BIOS_ERR, "Error: eSPI timed out waiting for status update.\n"); printk(BIOS_ERR, "Error: eSPI timed out waiting for status update.\n");
return -1; return CB_ERR;
} }
static void espi_show_failure(const struct espi_cmd *cmd, const char *str, uint32_t status) static void espi_show_failure(const struct espi_cmd *cmd, const char *str, uint32_t status)
@ -476,7 +476,7 @@ static void espi_show_failure(const struct espi_cmd *cmd, const char *str, uint3
printk(BIOS_ERR, "%s (Status = 0x%x)\n", str, status); printk(BIOS_ERR, "%s (Status = 0x%x)\n", str, status);
} }
static int espi_send_command(const struct espi_cmd *cmd) static enum cb_err espi_send_command(const struct espi_cmd *cmd)
{ {
uint32_t status; uint32_t status;
@ -484,9 +484,9 @@ static int espi_send_command(const struct espi_cmd *cmd)
printk(BIOS_DEBUG, "eSPI cmd0-cmd2: %08x %08x %08x data: %08x.\n", printk(BIOS_DEBUG, "eSPI cmd0-cmd2: %08x %08x %08x data: %08x.\n",
cmd->hdr0.val, cmd->hdr1.val, cmd->hdr2.val, cmd->data.val); cmd->hdr0.val, cmd->hdr1.val, cmd->hdr2.val, cmd->data.val);
if (espi_wait_ready() == -1) { if (espi_wait_ready() != CB_SUCCESS) {
espi_show_failure(cmd, "Error: eSPI was not ready to accept a command", 0); espi_show_failure(cmd, "Error: eSPI was not ready to accept a command", 0);
return -1; return CB_ERR;
} }
espi_clear_status(); espi_clear_status();
@ -498,36 +498,36 @@ static int espi_send_command(const struct espi_cmd *cmd)
/* Dword 0 must be last as this write triggers the transaction */ /* Dword 0 must be last as this write triggers the transaction */
espi_write32(ESPI_DN_TX_HDR0, cmd->hdr0.val); espi_write32(ESPI_DN_TX_HDR0, cmd->hdr0.val);
if (espi_wait_ready() == -1) { if (espi_wait_ready() != CB_SUCCESS) {
espi_show_failure(cmd, espi_show_failure(cmd,
"Error: eSPI timed out waiting for command to complete", 0); "Error: eSPI timed out waiting for command to complete", 0);
return -1; return CB_ERR;
} }
if (espi_poll_status(&status) == -1) { if (espi_poll_status(&status) != CB_SUCCESS) {
espi_show_failure(cmd, "Error: eSPI poll status failed", 0); espi_show_failure(cmd, "Error: eSPI poll status failed", 0);
return -1; return CB_ERR;
} }
/* If command did not complete downstream, return error. */ /* If command did not complete downstream, return error. */
if (!(status & ESPI_STATUS_DNCMD_COMPLETE)) { if (!(status & ESPI_STATUS_DNCMD_COMPLETE)) {
espi_show_failure(cmd, "Error: eSPI downstream command completion failure", espi_show_failure(cmd, "Error: eSPI downstream command completion failure",
status); status);
return -1; return CB_ERR;
} }
if (status & ~(ESPI_STATUS_DNCMD_COMPLETE | cmd->expected_status_codes)) { if (status & ~(ESPI_STATUS_DNCMD_COMPLETE | cmd->expected_status_codes)) {
espi_show_failure(cmd, "Error: unexpected eSPI status register bits set", espi_show_failure(cmd, "Error: unexpected eSPI status register bits set",
status); status);
return -1; return CB_ERR;
} }
espi_write32(ESPI_SLAVE0_INT_STS, status); espi_write32(ESPI_SLAVE0_INT_STS, status);
return 0; return CB_SUCCESS;
} }
static int espi_send_reset(void) static enum cb_err espi_send_reset(void)
{ {
struct espi_cmd cmd = { struct espi_cmd cmd = {
.hdr0 = { .hdr0 = {
@ -566,7 +566,7 @@ static int espi_send_reset(void)
return espi_send_command(&cmd); return espi_send_command(&cmd);
} }
static int espi_send_pltrst(const struct espi_config *mb_cfg, bool assert) static enum cb_err espi_send_pltrst(const struct espi_config *mb_cfg, bool assert)
{ {
struct espi_cmd cmd = { struct espi_cmd cmd = {
.hdr0 = { .hdr0 = {
@ -582,7 +582,7 @@ static int espi_send_pltrst(const struct espi_config *mb_cfg, bool assert)
}; };
if (!mb_cfg->vw_ch_en) if (!mb_cfg->vw_ch_en)
return 0; return CB_SUCCESS;
return espi_send_command(&cmd); return espi_send_command(&cmd);
} }
@ -594,7 +594,7 @@ static int espi_send_pltrst(const struct espi_config *mb_cfg, bool assert)
#define ESPI_CONFIGURATION_HDATA0(a) (((a) >> 8) & 0xff) #define ESPI_CONFIGURATION_HDATA0(a) (((a) >> 8) & 0xff)
#define ESPI_CONFIGURATION_HDATA1(a) ((a) & 0xff) #define ESPI_CONFIGURATION_HDATA1(a) ((a) & 0xff)
static int espi_get_configuration(uint16_t slave_reg_addr, uint32_t *config) static enum cb_err espi_get_configuration(uint16_t slave_reg_addr, uint32_t *config)
{ {
struct espi_cmd cmd = { struct espi_cmd cmd = {
.hdr0 = { .hdr0 = {
@ -607,8 +607,8 @@ static int espi_get_configuration(uint16_t slave_reg_addr, uint32_t *config)
*config = 0; *config = 0;
if (espi_send_command(&cmd)) if (espi_send_command(&cmd) != CB_SUCCESS)
return -1; return CB_ERR;
*config = espi_read32(ESPI_DN_TX_HDR1); *config = espi_read32(ESPI_DN_TX_HDR1);
@ -616,10 +616,10 @@ static int espi_get_configuration(uint16_t slave_reg_addr, uint32_t *config)
printk(BIOS_DEBUG, "Get configuration for slave register(0x%x): 0x%x\n", printk(BIOS_DEBUG, "Get configuration for slave register(0x%x): 0x%x\n",
slave_reg_addr, *config); slave_reg_addr, *config);
return 0; return CB_SUCCESS;
} }
static int espi_set_configuration(uint16_t slave_reg_addr, uint32_t config) static enum cb_err espi_set_configuration(uint16_t slave_reg_addr, uint32_t config)
{ {
struct espi_cmd cmd = { struct espi_cmd cmd = {
.hdr0 = { .hdr0 = {
@ -636,13 +636,13 @@ static int espi_set_configuration(uint16_t slave_reg_addr, uint32_t config)
return espi_send_command(&cmd); return espi_send_command(&cmd);
} }
static int espi_get_general_configuration(uint32_t *config) static enum cb_err espi_get_general_configuration(uint32_t *config)
{ {
if (espi_get_configuration(ESPI_SLAVE_GENERAL_CFG, config) == -1) if (espi_get_configuration(ESPI_SLAVE_GENERAL_CFG, config) != CB_SUCCESS)
return -1; return CB_ERR;
espi_show_slave_general_configuration(*config); espi_show_slave_general_configuration(*config);
return 0; return CB_SUCCESS;
} }
static void espi_set_io_mode_config(enum espi_io_mode mb_io_mode, uint32_t slave_caps, static void espi_set_io_mode_config(enum espi_io_mode mb_io_mode, uint32_t slave_caps,
@ -737,7 +737,8 @@ static void espi_set_alert_pin_config(enum espi_alert_pin alert_pin, uint32_t sl
} }
} }
static int espi_set_general_configuration(const struct espi_config *mb_cfg, uint32_t slave_caps) static enum cb_err espi_set_general_configuration(const struct espi_config *mb_cfg,
uint32_t slave_caps)
{ {
uint32_t slave_config = 0; uint32_t slave_config = 0;
uint32_t ctrlr_config = 0; uint32_t ctrlr_config = 0;
@ -757,14 +758,14 @@ static int espi_set_general_configuration(const struct espi_config *mb_cfg, uint
espi_show_slave_general_configuration(slave_config); espi_show_slave_general_configuration(slave_config);
if (espi_set_configuration(ESPI_SLAVE_GENERAL_CFG, slave_config) == -1) if (espi_set_configuration(ESPI_SLAVE_GENERAL_CFG, slave_config) != CB_SUCCESS)
return -1; return CB_ERR;
espi_write32(ESPI_SLAVE0_CONFIG, ctrlr_config); espi_write32(ESPI_SLAVE0_CONFIG, ctrlr_config);
return 0; return CB_SUCCESS;
} }
static int espi_wait_channel_ready(uint16_t slave_reg_addr) static enum cb_err espi_wait_channel_ready(uint16_t slave_reg_addr)
{ {
struct stopwatch sw; struct stopwatch sw;
uint32_t config; uint32_t config;
@ -773,12 +774,12 @@ static int espi_wait_channel_ready(uint16_t slave_reg_addr)
do { do {
espi_get_configuration(slave_reg_addr, &config); espi_get_configuration(slave_reg_addr, &config);
if (espi_slave_is_channel_ready(config)) if (espi_slave_is_channel_ready(config))
return 0; return CB_SUCCESS;
} while (!stopwatch_expired(&sw)); } while (!stopwatch_expired(&sw));
printk(BIOS_ERR, "Error: Channel is not ready after %d usec (slave addr: 0x%x)\n", printk(BIOS_ERR, "Error: Channel is not ready after %d usec (slave addr: 0x%x)\n",
ESPI_CH_READY_TIMEOUT_US, slave_reg_addr); ESPI_CH_READY_TIMEOUT_US, slave_reg_addr);
return -1; return CB_ERR;
} }
@ -791,23 +792,24 @@ static void espi_enable_ctrlr_channel(uint32_t channel_en)
espi_write32(ESPI_SLAVE0_CONFIG, reg); espi_write32(ESPI_SLAVE0_CONFIG, reg);
} }
static int espi_set_channel_configuration(uint32_t slave_config, uint32_t slave_reg_addr, static enum cb_err espi_set_channel_configuration(uint32_t slave_config,
uint32_t slave_reg_addr,
uint32_t ctrlr_enable) uint32_t ctrlr_enable)
{ {
if (espi_set_configuration(slave_reg_addr, slave_config) == -1) if (espi_set_configuration(slave_reg_addr, slave_config) != CB_SUCCESS)
return -1; return CB_ERR;
if (!(slave_config & ESPI_SLAVE_CHANNEL_ENABLE)) if (!(slave_config & ESPI_SLAVE_CHANNEL_ENABLE))
return 0; return CB_SUCCESS;
if (espi_wait_channel_ready(slave_reg_addr) == -1) if (espi_wait_channel_ready(slave_reg_addr) != CB_SUCCESS)
return -1; return CB_ERR;
espi_enable_ctrlr_channel(ctrlr_enable); espi_enable_ctrlr_channel(ctrlr_enable);
return 0; return CB_SUCCESS;
} }
static int espi_setup_vw_channel(const struct espi_config *mb_cfg, uint32_t slave_caps) static enum cb_err espi_setup_vw_channel(const struct espi_config *mb_cfg, uint32_t slave_caps)
{ {
uint32_t slave_vw_caps; uint32_t slave_vw_caps;
uint32_t ctrlr_vw_caps; uint32_t ctrlr_vw_caps;
@ -817,15 +819,15 @@ static int espi_setup_vw_channel(const struct espi_config *mb_cfg, uint32_t slav
uint32_t slave_config; uint32_t slave_config;
if (!mb_cfg->vw_ch_en) if (!mb_cfg->vw_ch_en)
return 0; return CB_SUCCESS;
if (!espi_slave_supports_vw_channel(slave_caps)) { if (!espi_slave_supports_vw_channel(slave_caps)) {
printk(BIOS_ERR, "Error: eSPI slave doesn't support VW channel!\n"); printk(BIOS_ERR, "Error: eSPI slave doesn't support VW channel!\n");
return -1; return CB_ERR;
} }
if (espi_get_configuration(ESPI_SLAVE_VW_CFG, &slave_vw_caps) == -1) if (espi_get_configuration(ESPI_SLAVE_VW_CFG, &slave_vw_caps) != CB_SUCCESS)
return -1; return CB_ERR;
ctrlr_vw_caps = espi_read32(ESPI_MASTER_CAP); ctrlr_vw_caps = espi_read32(ESPI_MASTER_CAP);
ctrlr_vw_count_supp = (ctrlr_vw_caps & ESPI_VW_MAX_SIZE_MASK) >> ESPI_VW_MAX_SIZE_SHIFT; ctrlr_vw_count_supp = (ctrlr_vw_caps & ESPI_VW_MAX_SIZE_MASK) >> ESPI_VW_MAX_SIZE_SHIFT;
@ -837,15 +839,16 @@ static int espi_setup_vw_channel(const struct espi_config *mb_cfg, uint32_t slav
return espi_set_channel_configuration(slave_config, ESPI_SLAVE_VW_CFG, ESPI_VW_CH_EN); return espi_set_channel_configuration(slave_config, ESPI_SLAVE_VW_CFG, ESPI_VW_CH_EN);
} }
static int espi_setup_periph_channel(const struct espi_config *mb_cfg, uint32_t slave_caps) static enum cb_err espi_setup_periph_channel(const struct espi_config *mb_cfg,
uint32_t slave_caps)
{ {
uint32_t slave_config; uint32_t slave_config;
/* Peripheral channel requires BME bit to be set when enabling the channel. */ /* Peripheral channel requires BME bit to be set when enabling the channel. */
const uint32_t slave_en_mask = const uint32_t slave_en_mask =
ESPI_SLAVE_CHANNEL_ENABLE | ESPI_SLAVE_PERIPH_BUS_MASTER_ENABLE; ESPI_SLAVE_CHANNEL_ENABLE | ESPI_SLAVE_PERIPH_BUS_MASTER_ENABLE;
if (espi_get_configuration(ESPI_SLAVE_PERIPH_CFG, &slave_config) == -1) if (espi_get_configuration(ESPI_SLAVE_PERIPH_CFG, &slave_config) != CB_SUCCESS)
return -1; return CB_ERR;
/* /*
* Peripheral channel is the only one which is enabled on reset. So, if the mainboard * Peripheral channel is the only one which is enabled on reset. So, if the mainboard
@ -855,7 +858,7 @@ static int espi_setup_periph_channel(const struct espi_config *mb_cfg, uint32_t
if (mb_cfg->periph_ch_en) { if (mb_cfg->periph_ch_en) {
if (!espi_slave_supports_periph_channel(slave_caps)) { if (!espi_slave_supports_periph_channel(slave_caps)) {
printk(BIOS_ERR, "Error: eSPI slave doesn't support periph channel!\n"); printk(BIOS_ERR, "Error: eSPI slave doesn't support periph channel!\n");
return -1; return CB_ERR;
} }
slave_config |= slave_en_mask; slave_config |= slave_en_mask;
} else { } else {
@ -868,20 +871,20 @@ static int espi_setup_periph_channel(const struct espi_config *mb_cfg, uint32_t
ESPI_PERIPH_CH_EN); ESPI_PERIPH_CH_EN);
} }
static int espi_setup_oob_channel(const struct espi_config *mb_cfg, uint32_t slave_caps) static enum cb_err espi_setup_oob_channel(const struct espi_config *mb_cfg, uint32_t slave_caps)
{ {
uint32_t slave_config; uint32_t slave_config;
if (!mb_cfg->oob_ch_en) if (!mb_cfg->oob_ch_en)
return 0; return CB_SUCCESS;
if (!espi_slave_supports_oob_channel(slave_caps)) { if (!espi_slave_supports_oob_channel(slave_caps)) {
printk(BIOS_ERR, "Error: eSPI slave doesn't support OOB channel!\n"); printk(BIOS_ERR, "Error: eSPI slave doesn't support OOB channel!\n");
return -1; return CB_ERR;
} }
if (espi_get_configuration(ESPI_SLAVE_OOB_CFG, &slave_config) == -1) if (espi_get_configuration(ESPI_SLAVE_OOB_CFG, &slave_config) != CB_SUCCESS)
return -1; return CB_ERR;
slave_config |= ESPI_SLAVE_CHANNEL_ENABLE; slave_config |= ESPI_SLAVE_CHANNEL_ENABLE;
@ -889,20 +892,21 @@ static int espi_setup_oob_channel(const struct espi_config *mb_cfg, uint32_t sla
ESPI_OOB_CH_EN); ESPI_OOB_CH_EN);
} }
static int espi_setup_flash_channel(const struct espi_config *mb_cfg, uint32_t slave_caps) static enum cb_err espi_setup_flash_channel(const struct espi_config *mb_cfg,
uint32_t slave_caps)
{ {
uint32_t slave_config; uint32_t slave_config;
if (!mb_cfg->flash_ch_en) if (!mb_cfg->flash_ch_en)
return 0; return CB_SUCCESS;
if (!espi_slave_supports_flash_channel(slave_caps)) { if (!espi_slave_supports_flash_channel(slave_caps)) {
printk(BIOS_ERR, "Error: eSPI slave doesn't support flash channel!\n"); printk(BIOS_ERR, "Error: eSPI slave doesn't support flash channel!\n");
return -1; return CB_ERR;
} }
if (espi_get_configuration(ESPI_SLAVE_FLASH_CFG, &slave_config) == -1) if (espi_get_configuration(ESPI_SLAVE_FLASH_CFG, &slave_config) != CB_SUCCESS)
return -1; return CB_ERR;
slave_config |= ESPI_SLAVE_CHANNEL_ENABLE; slave_config |= ESPI_SLAVE_CHANNEL_ENABLE;
@ -968,7 +972,7 @@ int espi_setup(void)
* Send in-band reset * Send in-band reset
* The resets affects both host and slave devices, so set initial config again. * The resets affects both host and slave devices, so set initial config again.
*/ */
if (espi_send_reset() == -1) { if (espi_send_reset() != CB_SUCCESS) {
printk(BIOS_ERR, "Error: In-band reset failed!\n"); printk(BIOS_ERR, "Error: In-band reset failed!\n");
return -1; return -1;
} }
@ -978,7 +982,7 @@ int espi_setup(void)
* Boot sequence: Step 3 * Boot sequence: Step 3
* Get configuration of slave device. * Get configuration of slave device.
*/ */
if (espi_get_general_configuration(&slave_caps) == -1) { if (espi_get_general_configuration(&slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Slave GET_CONFIGURATION failed!\n"); printk(BIOS_ERR, "Error: Slave GET_CONFIGURATION failed!\n");
return -1; return -1;
} }
@ -988,7 +992,7 @@ int espi_setup(void)
* Step 4: Write slave device general config * Step 4: Write slave device general config
* Step 5: Set host slave config * Step 5: Set host slave config
*/ */
if (espi_set_general_configuration(cfg, slave_caps) == -1) { if (espi_set_general_configuration(cfg, slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Slave SET_CONFIGURATION failed!\n"); printk(BIOS_ERR, "Error: Slave SET_CONFIGURATION failed!\n");
return -1; return -1;
} }
@ -1004,34 +1008,34 @@ int espi_setup(void)
* Channel setup * Channel setup
*/ */
/* Set up VW first so we can deassert PLTRST#. */ /* Set up VW first so we can deassert PLTRST#. */
if (espi_setup_vw_channel(cfg, slave_caps) == -1) { if (espi_setup_vw_channel(cfg, slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Setup VW channel failed!\n"); printk(BIOS_ERR, "Error: Setup VW channel failed!\n");
return -1; return -1;
} }
/* Assert PLTRST# if VW channel is enabled by mainboard. */ /* Assert PLTRST# if VW channel is enabled by mainboard. */
if (espi_send_pltrst(cfg, true) == -1) { if (espi_send_pltrst(cfg, true) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: PLTRST# assertion failed!\n"); printk(BIOS_ERR, "Error: PLTRST# assertion failed!\n");
return -1; return -1;
} }
/* De-assert PLTRST# if VW channel is enabled by mainboard. */ /* De-assert PLTRST# if VW channel is enabled by mainboard. */
if (espi_send_pltrst(cfg, false) == -1) { if (espi_send_pltrst(cfg, false) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: PLTRST# deassertion failed!\n"); printk(BIOS_ERR, "Error: PLTRST# deassertion failed!\n");
return -1; return -1;
} }
if (espi_setup_periph_channel(cfg, slave_caps) == -1) { if (espi_setup_periph_channel(cfg, slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Setup Periph channel failed!\n"); printk(BIOS_ERR, "Error: Setup Periph channel failed!\n");
return -1; return -1;
} }
if (espi_setup_oob_channel(cfg, slave_caps) == -1) { if (espi_setup_oob_channel(cfg, slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Setup OOB channel failed!\n"); printk(BIOS_ERR, "Error: Setup OOB channel failed!\n");
return -1; return -1;
} }
if (espi_setup_flash_channel(cfg, slave_caps) == -1) { if (espi_setup_flash_channel(cfg, slave_caps) != CB_SUCCESS) {
printk(BIOS_ERR, "Error: Setup Flash channel failed!\n"); printk(BIOS_ERR, "Error: Setup Flash channel failed!\n");
return -1; return -1;
} }