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system76_ec: Improve performance

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Change-Id: I4c35dd70067d78c3eded549de1a37ded6db3d364
This commit is contained in:
Jeremy Soller
2020-06-04 10:05:39 -06:00
parent d06f9c7699
commit 24ba49558e
3 changed files with 51 additions and 39 deletions
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2
src/console/console.c
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@@ -22,6 +22,7 @@ void console_hw_init(void)
__usbdebug_init();
__spiconsole_init();
__flashconsole_init();
__system76_ec_init();
}
void console_tx_byte(unsigned char byte)
@@ -52,6 +53,7 @@ void console_tx_flush(void)
__ne2k_tx_flush();
__usb_tx_flush();
__flashconsole_tx_flush();
__system76_ec_tx_flush();
}
void console_write_line(uint8_t *buffer, size_t number_of_bytes)

70
src/drivers/system76_ec/system76_ec.c
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@@ -4,46 +4,46 @@
#define SYSTEM76_EC_BASE 0x0E00
static uint8_t system76_ec_read(uint8_t addr) {
static inline uint8_t system76_ec_read(uint8_t addr) {
return inb(SYSTEM76_EC_BASE + (uint16_t)addr);
}
static void system76_ec_write(uint8_t addr, uint8_t data) {
static inline void system76_ec_write(uint8_t addr, uint8_t data) {
outb(data, SYSTEM76_EC_BASE + (uint16_t)addr);
}
int system76_ec_print(uint8_t *buf, size_t len) {
size_t i;
for (i=0; i < len;) {
if (system76_ec_read(0) == 0) {
size_t j;
for (j=0; (i < len) && ((j + 4) < 256); i++, j++) {
system76_ec_write((uint8_t)(j + 4), buf[i]);
}
// Flags
system76_ec_write(2, 0);
// Length
system76_ec_write(3, (uint8_t)j);
// Command
system76_ec_write(0, 4);
// Wait for command completion, for up to 1 second
int timeout;
for (timeout = 1000000; timeout > 0; timeout--) {
if (system76_ec_read(0) == 0) break;
udelay(1);
}
if (timeout == 0) {
// Error: timeout occured
return -1;
}
if (system76_ec_read(1) != 0) {
// Error: command failed
return -1;
}
} else {
// Error: command is already running
return -1;
}
void system76_ec_init(void) {
// Clear entire command region
for (int i = 0; i < 256; i++) {
system76_ec_write((uint8_t)i, 0);
}
}
void system76_ec_flush(void) {
// Send command
system76_ec_write(0, 4);
// Wait for command completion, for up to 1 second
int timeout;
for (timeout = 1000000; timeout > 0; timeout--) {
if (system76_ec_read(0) == 0) break;
udelay(1);
}
// Clear length
system76_ec_write(3, 0);
}
void system76_ec_print(uint8_t byte) {
// Read length
uint8_t len = system76_ec_read(3);
// Write data at offset
system76_ec_write(len + 4, byte);
// Update length
system76_ec_write(3, len + 1);
// If we hit the end of the buffer, or were given a newline, flush
if (byte == '\n' || len >= 128) {
system76_ec_flush();
}
return (int)i;
}

18
src/include/console/system76_ec.h
View File

@@ -4,17 +4,27 @@
#include <stddef.h>
#include <stdint.h>
int system76_ec_print(uint8_t *buf, size_t len);
void system76_ec_init(void);
void system76_ec_flush(void);
void system76_ec_print(uint8_t byte);
#define __CONSOLE_SYSTEM76_EC_ENABLE__ (CONFIG(CONSOLE_SYSTEM76_EC) && \
(ENV_BOOTBLOCK || ENV_ROMSTAGE || ENV_RAMSTAGE || ENV_VERSTAGE || \
ENV_POSTCAR || (ENV_SMM && CONFIG(DEBUG_SMI))))
(ENV_BOOTBLOCK || ENV_ROMSTAGE || ENV_RAMSTAGE || ENV_SEPARATE_VERSTAGE \
|| ENV_POSTCAR || (ENV_SMM && CONFIG(DEBUG_SMI))))
#if __CONSOLE_SYSTEM76_EC_ENABLE__
static inline void __system76_ec_init(void) {
system76_ec_init();
}
static inline void __system76_ec_tx_flush(void) {
system76_ec_flush();
}
static inline void __system76_ec_tx_byte(unsigned char byte) {
system76_ec_print(&byte, 1);
system76_ec_print(byte);
}
#else
static inline void __system76_ec_init(void) {}
static inline void __system76_ec_tx_flush(void) {}
static inline void __system76_ec_tx_byte(unsigned char byte) {}
#endif