diff options
Diffstat (limited to 'arch/x86/cpu/quark/quark.c')
| -rw-r--r-- | arch/x86/cpu/quark/quark.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c index 8b78a86..77d644a 100644 --- a/arch/x86/cpu/quark/quark.c +++ b/arch/x86/cpu/quark/quark.c @@ -8,6 +8,7 @@ #include <mmc.h> #include <asm/io.h> #include <asm/irq.h> +#include <asm/mtrr.h> #include <asm/pci.h> #include <asm/post.h> #include <asm/processor.h> @@ -34,6 +35,55 @@ static void unprotect_spi_flash(void) qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, 0xd8, bc); } +static void quark_setup_mtrr(void) +{ + u32 base, mask; + int i; + + disable_caches(); + + /* mark the VGA RAM area as uncacheable */ + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_16K_A0000, + MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE)); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_16K_B0000, + MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE)); + + /* mark other fixed range areas as cacheable */ + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_64K_00000, + MTRR_FIX_TYPE(MTRR_TYPE_WRBACK)); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_64K_40000, + MTRR_FIX_TYPE(MTRR_TYPE_WRBACK)); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_16K_80000, + MTRR_FIX_TYPE(MTRR_TYPE_WRBACK)); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_FIX_16K_90000, + MTRR_FIX_TYPE(MTRR_TYPE_WRBACK)); + for (i = MTRR_FIX_4K_C0000; i <= MTRR_FIX_4K_FC000; i++) + msg_port_write(MSG_PORT_HOST_BRIDGE, i, + MTRR_FIX_TYPE(MTRR_TYPE_WRBACK)); + + /* variable range MTRR#0: ROM area */ + mask = ~(CONFIG_SYS_MONITOR_LEN - 1); + base = CONFIG_SYS_TEXT_BASE & mask; + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYBASE(MTRR_VAR_ROM), + base | MTRR_TYPE_WRBACK); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYMASK(MTRR_VAR_ROM), + mask | MTRR_PHYS_MASK_VALID); + + /* variable range MTRR#1: eSRAM area */ + mask = ~(ESRAM_SIZE - 1); + base = CONFIG_ESRAM_BASE & mask; + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYBASE(MTRR_VAR_ESRAM), + base | MTRR_TYPE_WRBACK); + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYMASK(MTRR_VAR_ESRAM), + mask | MTRR_PHYS_MASK_VALID); + + /* enable both variable and fixed range MTRRs */ + msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_DEF_TYPE, + MTRR_DEF_TYPE_EN | MTRR_DEF_TYPE_FIX_EN); + + enable_caches(); +} + static void quark_setup_bars(void) { /* GPIO - D31:F0:R44h */ @@ -191,6 +241,13 @@ int arch_cpu_init(void) return ret; /* + * Quark SoC does not support MSR MTRRs. Fixed and variable range MTRRs + * are accessed indirectly via the message port and not the traditional + * MSR mechanism. Only UC, WT and WB cache types are supported. + */ + quark_setup_mtrr(); + + /* * Quark SoC has some non-standard BARs (excluding PCI standard BARs) * which need be initialized with suggested values */ |