Use accessor functions for MMIO. Some MMIO accesses used volatile, others didn't (and risked non-execution of side effects) and even with volatile, some accesses looked dubious.
Since the MMIO accessor functions and the onboard flash accessor functions are functionally identical (but have different signatures), make the flash accessors wrappers for the MMIO accessors.
Signed-off-by: Carl-Daniel Hailfinger c-d.hailfinger.devel.2006@gmx.net
Compile tested only.
Index: flashrom-mmio_accessors/flash.h =================================================================== --- flashrom-mmio_accessors/flash.h (Revision 523) +++ flashrom-mmio_accessors/flash.h (Arbeitskopie) @@ -621,6 +621,12 @@ uint8_t internal_chip_readb(const chipaddr addr); uint16_t internal_chip_readw(const chipaddr addr); uint32_t internal_chip_readl(const chipaddr addr); +void mmio_writeb(uint8_t val, void * addr); +void mmio_writew(uint16_t val, void * addr); +void mmio_writel(uint32_t val, void * addr); +uint8_t mmio_readb(void * addr); +uint16_t mmio_readw(void * addr); +uint32_t mmio_readl(void * addr); void fallback_chip_writew(uint16_t val, chipaddr addr); void fallback_chip_writel(uint32_t val, chipaddr addr); uint16_t fallback_chip_readw(const chipaddr addr); @@ -731,7 +737,7 @@ int sb600_spi_read(struct flashchip *flash, uint8_t *buf); int sb600_spi_write_1(struct flashchip *flash, uint8_t *buf); uint8_t sb600_read_status_register(void); -extern uint8_t volatile *sb600_spibar; +extern uint8_t *sb600_spibar;
/* jedec.c */ uint8_t oddparity(uint8_t val); Index: flashrom-mmio_accessors/chipset_enable.c =================================================================== --- flashrom-mmio_accessors/chipset_enable.c (Revision 523) +++ flashrom-mmio_accessors/chipset_enable.c (Arbeitskopie) @@ -215,7 +215,7 @@ spibar = physmap("VT8237S MMIO registers", mmio_base, 0x70);
printf_debug("0x6c: 0x%04x (CLOCK/DEBUG)\n", - *(uint16_t *) (spibar + 0x6c)); + mmio_readw(spibar + 0x6c));
flashbus = BUS_TYPE_VIA_SPI; ich_init_opcodes(); @@ -245,14 +245,14 @@ /* Map RCBA to virtual memory */ rcrb = physmap("ICH RCRB", tmp, 0x4000);
- gcs = *(volatile uint32_t *)(rcrb + 0x3410); + gcs = mmio_readl(rcrb + 0x3410); printf_debug("GCS = 0x%x: ", gcs); printf_debug("BIOS Interface Lock-Down: %sabled, ", (gcs & 0x1) ? "en" : "dis"); bbs = (gcs >> 10) & 0x3; printf_debug("BOOT BIOS Straps: 0x%x (%s)\n", bbs, straps_names[bbs]);
- buc = *(volatile uint8_t *)(rcrb + 0x3414); + buc = mmio_readb(rcrb + 0x3414); printf_debug("Top Swap : %s\n", (buc & 1) ? "enabled (A16 inverted)" : "not enabled");
@@ -292,44 +292,44 @@ switch (flashbus) { case BUS_TYPE_ICH7_SPI: printf_debug("0x00: 0x%04x (SPIS)\n", - *(uint16_t *) (spibar + 0)); + mmio_readw(spibar + 0)); printf_debug("0x02: 0x%04x (SPIC)\n", - *(uint16_t *) (spibar + 2)); + mmio_readw(spibar + 2)); printf_debug("0x04: 0x%08x (SPIA)\n", - *(uint32_t *) (spibar + 4)); + mmio_readl(spibar + 4)); for (i = 0; i < 8; i++) { int offs; offs = 8 + (i * 8); printf_debug("0x%02x: 0x%08x (SPID%d)\n", offs, - *(uint32_t *) (spibar + offs), i); + mmio_readl(spibar + offs), i); printf_debug("0x%02x: 0x%08x (SPID%d+4)\n", offs + 4, - *(uint32_t *) (spibar + offs + 4), i); + mmio_readl(spibar + offs + 4), i); } printf_debug("0x50: 0x%08x (BBAR)\n", - *(uint32_t *) (spibar + 0x50)); + mmio_readl(spibar + 0x50)); printf_debug("0x54: 0x%04x (PREOP)\n", - *(uint16_t *) (spibar + 0x54)); + mmio_readw(spibar + 0x54)); printf_debug("0x56: 0x%04x (OPTYPE)\n", - *(uint16_t *) (spibar + 0x56)); + mmio_readw(spibar + 0x56)); printf_debug("0x58: 0x%08x (OPMENU)\n", - *(uint32_t *) (spibar + 0x58)); + mmio_readl(spibar + 0x58)); printf_debug("0x5c: 0x%08x (OPMENU+4)\n", - *(uint32_t *) (spibar + 0x5c)); + mmio_readl(spibar + 0x5c)); for (i = 0; i < 4; i++) { int offs; offs = 0x60 + (i * 4); printf_debug("0x%02x: 0x%08x (PBR%d)\n", offs, - *(uint32_t *) (spibar + offs), i); + mmio_readl(spibar + offs), i); } printf_debug("\n"); - if ((*(uint16_t *) spibar) & (1 << 15)) { + if (mmio_readw(spibar) & (1 << 15)) { printf("WARNING: SPI Configuration Lockdown activated.\n"); ichspi_lock = 1; } ich_init_opcodes(); break; case BUS_TYPE_ICH9_SPI: - tmp2 = *(uint16_t *) (spibar + 4); + tmp2 = mmio_readw(spibar + 4); printf_debug("0x04: 0x%04x (HSFS)\n", tmp2); printf_debug("FLOCKDN %i, ", (tmp2 >> 15 & 1)); printf_debug("FDV %i, ", (tmp2 >> 14) & 1); @@ -340,7 +340,7 @@ printf_debug("FCERR %i, ", (tmp2 >> 1) & 1); printf_debug("FDONE %i\n", (tmp2 >> 0) & 1);
- tmp = *(uint32_t *) (spibar + 0x50); + tmp = mmio_readl(spibar + 0x50); printf_debug("0x50: 0x%08x (FRAP)\n", tmp); printf_debug("BMWAG %i, ", (tmp >> 24) & 0xff); printf_debug("BMRAG %i, ", (tmp >> 16) & 0xff); @@ -348,39 +348,39 @@ printf_debug("BRRA %i\n", (tmp >> 0) & 0xff);
printf_debug("0x54: 0x%08x (FREG0)\n", - *(uint32_t *) (spibar + 0x54)); + mmio_readl(spibar + 0x54)); printf_debug("0x58: 0x%08x (FREG1)\n", - *(uint32_t *) (spibar + 0x58)); + mmio_readl(spibar + 0x58)); printf_debug("0x5C: 0x%08x (FREG2)\n", - *(uint32_t *) (spibar + 0x5C)); + mmio_readl(spibar + 0x5C)); printf_debug("0x60: 0x%08x (FREG3)\n", - *(uint32_t *) (spibar + 0x60)); + mmio_readl(spibar + 0x60)); printf_debug("0x64: 0x%08x (FREG4)\n", - *(uint32_t *) (spibar + 0x64)); + mmio_readl(spibar + 0x64)); printf_debug("0x74: 0x%08x (PR0)\n", - *(uint32_t *) (spibar + 0x74)); + mmio_readl(spibar + 0x74)); printf_debug("0x78: 0x%08x (PR1)\n", - *(uint32_t *) (spibar + 0x78)); + mmio_readl(spibar + 0x78)); printf_debug("0x7C: 0x%08x (PR2)\n", - *(uint32_t *) (spibar + 0x7C)); + mmio_readl(spibar + 0x7C)); printf_debug("0x80: 0x%08x (PR3)\n", - *(uint32_t *) (spibar + 0x80)); + mmio_readl(spibar + 0x80)); printf_debug("0x84: 0x%08x (PR4)\n", - *(uint32_t *) (spibar + 0x84)); + mmio_readl(spibar + 0x84)); printf_debug("0x90: 0x%08x (SSFS, SSFC)\n", - *(uint32_t *) (spibar + 0x90)); + mmio_readl(spibar + 0x90)); printf_debug("0x94: 0x%04x (PREOP)\n", - *(uint16_t *) (spibar + 0x94)); + mmio_readw(spibar + 0x94)); printf_debug("0x96: 0x%04x (OPTYPE)\n", - *(uint16_t *) (spibar + 0x96)); + mmio_readw(spibar + 0x96)); printf_debug("0x98: 0x%08x (OPMENU)\n", - *(uint32_t *) (spibar + 0x98)); + mmio_readl(spibar + 0x98)); printf_debug("0x9C: 0x%08x (OPMENU+4)\n", - *(uint32_t *) (spibar + 0x9C)); + mmio_readl(spibar + 0x9C)); printf_debug("0xA0: 0x%08x (BBAR)\n", - *(uint32_t *) (spibar + 0xA0)); + mmio_readl(spibar + 0xA0)); printf_debug("0xB0: 0x%08x (FDOC)\n", - *(uint32_t *) (spibar + 0xB0)); + mmio_readl(spibar + 0xB0)); if (tmp2 & (1 << 15)) { printf("WARNING: SPI Configuration Lockdown activated.\n"); ichspi_lock = 1; @@ -897,7 +897,7 @@ * BOOTCS region (PARx[31:29] = 100b)e */ for (i = 0x88; i <= 0xc4; i += 4) { - parx = *(volatile uint32_t *)(mmcr + i); + parx = mmio_readl(mmcr + i); if ((parx >> 29) == 4) { bootcs_found = 1; break; /* BOOTCS found */ Index: flashrom-mmio_accessors/sb600spi.c =================================================================== --- flashrom-mmio_accessors/sb600spi.c (Revision 523) +++ flashrom-mmio_accessors/sb600spi.c (Arbeitskopie) @@ -37,7 +37,7 @@ } sb600_spi_controller;
sb600_spi_controller *spi_bar = NULL; -uint8_t volatile *sb600_spibar; +uint8_t *sb600_spibar;
int sb600_spi_read(struct flashchip *flash, uint8_t *buf) { @@ -91,17 +91,17 @@
void reset_internal_fifo_pointer(void) { - sb600_spibar[2] |= 0x10; + mmio_writeb(mmio_readb(sb600_spibar + 2) | 0x10, sb600_spibar + 2);
- while (sb600_spibar[0xD] & 0x7) + while (mmio_readb(sb600_spibar + 0xD) & 0x7) printf("reset\n"); }
void execute_command(void) { - sb600_spibar[2] |= 1; + mmio_writeb(mmio_readb(sb600_spibar + 2) | 1, sb600_spibar + 2);
- while (sb600_spibar[2] & 1) + while (mmio_readb(sb600_spibar + 2) & 1) ; }
@@ -131,8 +131,8 @@ return 1; }
- sb600_spibar[0] = cmd; - sb600_spibar[1] = readcnt << 4 | (writecnt); + mmio_writeb(cmd, sb600_spibar + 0); + mmio_writeb(readcnt << 4 | (writecnt), sb600_spibar + 1);
/* Before we use the FIFO, reset it first. */ reset_internal_fifo_pointer(); @@ -140,7 +140,7 @@ /* Send the write byte to FIFO. */ for (count = 0; count < writecnt; count++, writearr++) { printf_debug(" [%x]", *writearr); - sb600_spibar[0xC] = *writearr; + mmio_writeb(*writearr, sb600_spibar + 0xC); } printf_debug("\n");
@@ -160,13 +160,13 @@ reset_internal_fifo_pointer();
for (count = 0; count < writecnt; count++) { - cmd = sb600_spibar[0xC]; /* Skip the byte we send. */ + cmd = mmio_readb(sb600_spibar + 0xC); /* Skip the byte we send. */ printf_debug("[ %2x]", cmd); }
- printf_debug("The FIFO pointer 6 is %d.\n", sb600_spibar[0xd] & 0x07); + printf_debug("The FIFO pointer 6 is %d.\n", mmio_readb(sb600_spibar + 0xd) & 0x07); for (count = 0; count < readcnt; count++, readarr++) { - *readarr = sb600_spibar[0xC]; + *readarr = mmio_readb(sb600_spibar + 0xC); printf_debug("[%02x]", *readarr); } printf_debug("\n"); Index: flashrom-mmio_accessors/internal.c =================================================================== --- flashrom-mmio_accessors/internal.c (Revision 523) +++ flashrom-mmio_accessors/internal.c (Arbeitskopie) @@ -137,31 +137,61 @@
void internal_chip_writeb(uint8_t val, chipaddr addr) { - *(volatile uint8_t *) addr = val; + mmio_writeb(val, (void *)addr); }
void internal_chip_writew(uint16_t val, chipaddr addr) { - *(volatile uint16_t *) addr = val; + mmio_writew(val, (void *)addr); }
void internal_chip_writel(uint32_t val, chipaddr addr) { - *(volatile uint32_t *) addr = val; + mmio_writel(val, (void *)addr); }
uint8_t internal_chip_readb(const chipaddr addr) { - return *(volatile uint8_t *) addr; + return mmio_readb((void *)addr); }
uint16_t internal_chip_readw(const chipaddr addr) { - return *(volatile uint16_t *) addr; + return mmio_readw((void *)addr); }
uint32_t internal_chip_readl(const chipaddr addr) { + return mmio_readl((void *)addr); +} + +void mmio_writeb(uint8_t val, void * addr) +{ + *(volatile uint8_t *) addr = val; +} + +void mmio_writew(uint16_t val, void * addr) +{ + *(volatile uint16_t *) addr = val; +} + +void mmio_writel(uint32_t val, void * addr) +{ + *(volatile uint32_t *) addr = val; +} + +uint8_t mmio_readb(void * addr) +{ + return *(volatile uint8_t *) addr; +} + +uint16_t mmio_readw(void * addr) +{ + return *(volatile uint16_t *) addr; +} + +uint32_t mmio_readl(void * addr) +{ return *(volatile uint32_t *) addr; }
Index: flashrom-mmio_accessors/ichspi.c =================================================================== --- flashrom-mmio_accessors/ichspi.c (Revision 523) +++ flashrom-mmio_accessors/ichspi.c (Arbeitskopie) @@ -129,21 +129,17 @@ /* HW access functions */ static uint32_t REGREAD32(int X) { - volatile uint32_t regval; - regval = *(volatile uint32_t *)((uint8_t *) spibar + X); - return regval; + return mmio_readl(spibar + X); }
static uint16_t REGREAD16(int X) { - volatile uint16_t regval; - regval = *(volatile uint16_t *)((uint8_t *) spibar + X); - return regval; + return mmio_readw(spibar + X); }
-#define REGWRITE32(X,Y) (*(uint32_t *)((uint8_t *)spibar+X)=Y) -#define REGWRITE16(X,Y) (*(uint16_t *)((uint8_t *)spibar+X)=Y) -#define REGWRITE8(X,Y) (*(uint8_t *)((uint8_t *)spibar+X)=Y) +#define REGWRITE32(X,Y) mmio_writel(Y, spibar+X) +#define REGWRITE16(X,Y) mmio_writew(Y, spibar+X) +#define REGWRITE8(X,Y) mmio_writeb(Y, spibar+X)
/* Common SPI functions */ static int find_opcode(OPCODES *op, uint8_t opcode);