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espi: Add some helper functions for espi capability check 

This change adds helper functions that can be used to check support
for different slave capabilities.

BUG=b:153675913

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: Ic66b06f9efcafd0eda4c6029fa67489de76bbed4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41253
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Furquan Shaikh 2020-05-11 16:43:37 -07:00
parent f3ac812e02
commit 470f627c2b
1 changed files with 92 additions and 0 deletions
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92
src/include/espi.h
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@ -4,6 +4,8 @@
#ifndef __ESPI_H__
#define __ESPI_H__
#include <stdint.h>
/* ESPI Slave Registers (Document # 327432-004 Revision 1.0 Chapter 7) */
#define ESPI_SLAVE_DEVICE_ID 0x04
@ -226,4 +228,94 @@
#define ESPI_VW_VALUE(x, v) ((v) << (x))
#define ESPI_VW_SIGNAL_HIGH(x) (ESPI_VW_VALID(x) | ESPI_VW_VALUE(1, x))
#define ESPI_VW_SIGNAL_LOW(x) (ESPI_VW_VALID(x) | ESPI_VW_VALUE(0, x))
static inline bool espi_slave_supports_quad_io(uint32_t gen_caps)
{
uint32_t mode = gen_caps & ESPI_SLAVE_IO_MODE_SUPP_MASK;
return (mode == ESPI_SLAVE_IO_MODE_SUPP_SINGLE_QUAD) ||
(mode == ESPI_SLAVE_IO_MODE_SUPP_SINGLE_DUAL_QUAD);
}
static inline bool espi_slave_supports_dual_io(uint32_t gen_caps)
{
uint32_t mode = gen_caps & ESPI_SLAVE_IO_MODE_SUPP_MASK;
return (mode == ESPI_SLAVE_IO_MODE_SUPP_SINGLE_DUAL) ||
(mode == ESPI_SLAVE_IO_MODE_SUPP_SINGLE_DUAL_QUAD);
}
static inline bool espi_slave_supports_66_mhz(uint32_t gen_caps)
{
uint32_t freq = gen_caps & ESPI_SLAVE_OP_FREQ_SUPP_MASK;
return freq == ESPI_SLAVE_OP_FREQ_SUPP_66_MHZ;
}
static inline bool espi_slave_supports_50_mhz(uint32_t gen_caps)
{
uint32_t freq = gen_caps & ESPI_SLAVE_OP_FREQ_SUPP_MASK;
return freq == ESPI_SLAVE_OP_FREQ_SUPP_50_MHZ;
}
static inline bool espi_slave_supports_33_mhz(uint32_t gen_caps)
{
uint32_t freq = gen_caps & ESPI_SLAVE_OP_FREQ_SUPP_MASK;
return freq == ESPI_SLAVE_OP_FREQ_SUPP_33_MHZ;
}
static inline bool espi_slave_supports_25_mhz(uint32_t gen_caps)
{
uint32_t freq = gen_caps & ESPI_SLAVE_OP_FREQ_SUPP_MASK;
return freq == ESPI_SLAVE_OP_FREQ_SUPP_25_MHZ;
}
static inline bool espi_slave_supports_20_mhz(uint32_t gen_caps)
{
uint32_t freq = gen_caps & ESPI_SLAVE_OP_FREQ_SUPP_MASK;
return freq == ESPI_SLAVE_OP_FREQ_SUPP_20_MHZ;
}
static inline int espi_slave_max_speed_mhz_supported(uint32_t gen_caps)
{
if (espi_slave_supports_66_mhz(gen_caps))
return 66;
else if (espi_slave_supports_50_mhz(gen_caps))
return 50;
else if (espi_slave_supports_33_mhz(gen_caps))
return 33;
else if (espi_slave_supports_25_mhz(gen_caps))
return 25;
else if (espi_slave_supports_20_mhz(gen_caps))
return 20;
return 0;
}
static inline bool espi_slave_supports_vw_channel(uint32_t gen_caps)
{
return !!(gen_caps & ESPI_SLAVE_VW_CH_SUPP);
}
static inline bool espi_slave_supports_periph_channel(uint32_t gen_caps)
{
return !!(gen_caps & ESPI_SLAVE_PERIPH_CH_SUPP);
}
static inline bool espi_slave_supports_oob_channel(uint32_t gen_caps)
{
return !!(gen_caps & ESPI_SLAVE_OOB_CH_SUPP);
}
static inline bool espi_slave_supports_flash_channel(uint32_t gen_caps)
{
return !!(gen_caps & ESPI_SLAVE_FLASH_CH_SUPP);
}
static inline bool espi_slave_is_channel_ready(uint32_t config)
{
return !!(config & ESPI_SLAVE_CHANNEL_READY);
}
static inline uint32_t espi_slave_get_vw_count_supp(uint32_t vw_caps)
{
return (vw_caps & ESPI_SLAVE_VW_COUNT_SUPP_MASK) >> ESPI_SLAVE_VW_COUNT_SUPP_SHIFT;
}
#endif /* __ESPI_H__ */