diff options
Diffstat (limited to 'src/mainboard/emulation/qemu-i440fx/fw_cfg.c')
| -rw-r--r-- | src/mainboard/emulation/qemu-i440fx/fw_cfg.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c index 3acb11e5f5..580e09ad45 100644 --- a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c +++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c @@ -24,20 +24,29 @@ #define FW_CFG_PORT_CTL 0x0510 #define FW_CFG_PORT_DATA 0x0511 +#define FW_CFG_DMA_ADDR_HIGH 0x0514 +#define FW_CFG_DMA_ADDR_LOW 0x0518 static int fw_cfg_detected; +static uint8_t fw_ver; + +static void fw_cfg_dma(int control, void *buf, int len); static int fw_cfg_present(void) { static const char qsig[] = "QEMU"; - unsigned char sig[4]; + unsigned char sig[FW_CFG_SIG_SIZE]; int detected = 0; if (fw_cfg_detected == 0) { fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig)); - detected = memcmp(sig, qsig, 4) == 0; + detected = memcmp(sig, qsig, FW_CFG_SIG_SIZE) == 0; printk(BIOS_INFO, "QEMU: firmware config interface %s\n", detected ? "detected" : "not found"); + if (detected) { + fw_cfg_get(FW_CFG_ID, &fw_ver, sizeof(fw_ver)); + printk(BIOS_INFO, "Firmware config version id: %d\n", fw_ver); + } fw_cfg_detected = detected + 1; } return fw_cfg_detected - 1; @@ -50,7 +59,10 @@ static void fw_cfg_select(uint16_t entry) static void fw_cfg_read(void *dst, int dstlen) { - insb(FW_CFG_PORT_DATA, dst, dstlen); + if (fw_ver & FW_CFG_VERSION_DMA) + fw_cfg_dma(FW_CFG_DMA_CTL_READ, dst, dstlen); + else + insb(FW_CFG_PORT_DATA, dst, dstlen); } void fw_cfg_get(uint16_t entry, void *dst, int dstlen) @@ -500,3 +512,31 @@ void smbios_system_set_uuid(u8 *uuid) fw_cfg_smbios_init(); memcpy(uuid, type1_uuid, 16); } + +/* + * Configure DMA setup + */ + +static void fw_cfg_dma(int control, void *buf, int len) +{ + volatile FwCfgDmaAccess dma; + uintptr_t dma_desc_addr; + uint32_t dma_desc_addr_hi, dma_desc_addr_lo; + + dma.control = be32_to_cpu(control); + dma.length = be32_to_cpu(len); + dma.address = be64_to_cpu((uintptr_t)buf); + + dma_desc_addr = (uintptr_t)&dma; + dma_desc_addr_lo = (uint32_t)(dma_desc_addr & 0xFFFFFFFFU); + dma_desc_addr_hi = sizeof(uintptr_t) > sizeof(uint32_t) + ? (uint32_t)(dma_desc_addr >> 32) : 0; + + // Skip writing high half if unnecessary. + if (dma_desc_addr_hi) + outl(be32_to_cpu(dma_desc_addr_hi), FW_CFG_DMA_ADDR_HIGH); + outl(be32_to_cpu(dma_desc_addr_lo), FW_CFG_DMA_ADDR_LOW); + + while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_CTL_ERROR) + ; +} |