drivers/pc80/mc146818rtc: Reduce superfluous preprocessor use
cmos_init() had layers of preprocessor directives, which resulted in a complete mess. Refactor it to make use of the IS_ENABLED() macro. This improves readability significantly. One of the changes is to remove in inline stub declaration of (get|set)_option. Although that provided the ability for the compiler to optimize out code when USE_OPTION_TABLE is not selected, there is no evidence that such savings are measureable. Change-Id: I07f00084d809adbb55031b2079f71136ade3028e Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-on: http://review.coreboot.org/8306 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
This commit is contained in:
Alexandru Gagniuc
parent
a4d784eeab
commit
b5669ba579
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@ -7,9 +7,7 @@ ramstage-$(CONFIG_UDELAY_IO) += udelay_io.c
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ramstage-y += keyboard.c
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ramstage-$(CONFIG_SPKMODEM) += spkmodem.c
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ifeq ($(CONFIG_DRIVERS_MC146818),y)
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romstage-$(CONFIG_USE_OPTION_TABLE) += mc146818rtc_early.c
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endif
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romstage-$(CONFIG_DRIVERS_MC146818) += mc146818rtc_early.c
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romstage-$(CONFIG_LPC_TPM) += tpm.c
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romstage-$(CONFIG_SPKMODEM) += spkmodem.c
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@ -26,9 +26,15 @@
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#include <boot/coreboot_tables.h>
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#include <rtc.h>
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#include <string.h>
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#include <cbfs.h>
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/* There's no way around this include guard. option_table.h is autogenerated */
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#if CONFIG_USE_OPTION_TABLE
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#include "option_table.h"
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#include <cbfs.h>
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#else
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#define LB_CKS_RANGE_START 0
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#define LB_CKS_RANGE_END 0
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#define LB_CKS_LOC 0
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#endif
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@ -48,7 +54,6 @@ static void cmos_reset_date(void)
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rtc_set(&time);
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}
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#if CONFIG_USE_OPTION_TABLE
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static int cmos_checksum_valid(int range_start, int range_end, int cks_loc)
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{
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int i;
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@ -71,19 +76,18 @@ static void cmos_set_checksum(int range_start, int range_end, int cks_loc)
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cmos_write(((sum >> 8) & 0x0ff), cks_loc);
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cmos_write(((sum >> 0) & 0x0ff), cks_loc + 1);
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}
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#endif
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#define RTC_CONTROL_DEFAULT (RTC_24H)
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#define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ)
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#ifndef __SMM__
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void cmos_init(int invalid)
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void cmos_init(bool invalid)
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{
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int cmos_invalid = 0;
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int checksum_invalid = 0;
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#if CONFIG_USE_OPTION_TABLE
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unsigned char x;
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#endif
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bool cmos_invalid = false;
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bool checksum_invalid = false;
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bool clear_cmos;
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size_t i;
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uint8_t x;
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#ifndef __PRE_RAM__
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/*
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@ -98,38 +102,37 @@ void cmos_init(int invalid)
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printk(BIOS_DEBUG, "RTC Init\n");
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#if CONFIG_USE_OPTION_TABLE
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if (IS_ENABLED(CONFIG_USE_OPTION_TABLE)) {
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/* See if there has been a CMOS power problem. */
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x = cmos_read(RTC_VALID);
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cmos_invalid = !(x & RTC_VRT);
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/* See if there is a CMOS checksum error */
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checksum_invalid = !cmos_checksum_valid(PC_CKS_RANGE_START,
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PC_CKS_RANGE_END,PC_CKS_LOC);
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PC_CKS_RANGE_END, PC_CKS_LOC);
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#define CLEAR_CMOS 0
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#else
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#define CLEAR_CMOS 1
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#endif
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clear_cmos = false;
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} else {
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clear_cmos = true;
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}
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if (invalid || cmos_invalid || checksum_invalid) {
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#if CLEAR_CMOS
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int i;
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if (clear_cmos) {
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cmos_write(0, 0x01);
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cmos_write(0, 0x03);
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cmos_write(0, 0x05);
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for (i = 10; i < 128; i++)
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cmos_write(0, i);
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#endif
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}
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if (cmos_invalid)
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cmos_reset_date();
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printk(BIOS_WARNING, "RTC:%s%s%s%s\n",
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invalid?" Clear requested":"",
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cmos_invalid?" Power Problem":"",
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checksum_invalid?" Checksum invalid":"",
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CLEAR_CMOS?" zeroing cmos":"");
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invalid ? " Clear requested":"",
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cmos_invalid ? " Power Problem":"",
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checksum_invalid ? " Checksum invalid":"",
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clear_cmos ? " zeroing cmos":"");
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}
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/* Setup the real time clock */
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@ -139,7 +142,7 @@ void cmos_init(int invalid)
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/* Ensure all reserved bits are 0 in register D */
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cmos_write(RTC_VRT, RTC_VALID);
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#if CONFIG_USE_OPTION_TABLE
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if (IS_ENABLED(CONFIG_USE_OPTION_TABLE)) {
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/* See if there is a LB CMOS checksum error */
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checksum_invalid = !cmos_checksum_valid(LB_CKS_RANGE_START,
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LB_CKS_RANGE_END,LB_CKS_LOC);
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@ -148,15 +151,14 @@ void cmos_init(int invalid)
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/* Make certain we have a valid checksum */
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cmos_set_checksum(PC_CKS_RANGE_START, PC_CKS_RANGE_END, PC_CKS_LOC);
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#endif
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}
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/* Clear any pending interrupts */
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cmos_read(RTC_INTR_FLAGS);
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}
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#endif
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#endif /* __SMM__ */
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#if CONFIG_USE_OPTION_TABLE
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/*
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* This routine returns the value of the requested bits.
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* input bit = bit count from the beginning of the cmos image
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@ -200,6 +202,9 @@ enum cb_err get_option(void *dest, const char *name)
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size_t namelen;
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int found = 0;
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if (!IS_ENABLED(CONFIG_USE_OPTION_TABLE))
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return CB_CMOS_OTABLE_DISABLED;
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/* Figure out how long name is */
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namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
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@ -280,6 +285,9 @@ enum cb_err set_option(const char *name, void *value)
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size_t namelen;
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int found = 0;
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if (!IS_ENABLED(CONFIG_USE_OPTION_TABLE))
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return CB_CMOS_OTABLE_DISABLED;
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/* Figure out how long name is */
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namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
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@ -318,7 +326,6 @@ enum cb_err set_option(const char *name, void *value)
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return CB_SUCCESS;
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}
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#endif /* CONFIG_USE_OPTION_TABLE */
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/*
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* If the CMOS is cleared, the rtc_reg has the invalid date. That
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@ -169,21 +169,13 @@ static inline void cmos_write32(u8 offset, u32 value)
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#endif
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#if !defined(__ROMCC__)
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void cmos_init(int invalid);
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void cmos_init(bool invalid);
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void cmos_check_update_date(void);
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#if CONFIG_USE_OPTION_TABLE
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enum cb_err set_option(const char *name, void *val);
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enum cb_err get_option(void *dest, const char *name);
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unsigned read_option_lowlevel(unsigned start, unsigned size, unsigned def);
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#else
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static inline enum cb_err set_option(const char *name __attribute__((unused)),
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void *val __attribute__((unused)))
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{ return CB_CMOS_OTABLE_DISABLED; };
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static inline enum cb_err get_option(void *dest __attribute__((unused)),
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const char *name __attribute__((unused)))
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{ return CB_CMOS_OTABLE_DISABLED; }
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#define read_option_lowlevel(start, size, def) def
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#endif
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#else /* defined(__ROMCC__) */
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#include <drivers/pc80/mc146818rtc_early.c>
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#endif /* !defined(__ROMCC__) */
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