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emulation/qemu-i440fx: use fw_cfg_dma for fw_cfg_read 

- configure DMA fw_cfg
- add support to read using fw_cfg_dma
- provide fw config version id info in logs

BUG=N/A
TEST=Build and boot using qemu-i440fx.

Change-Id: I0be5355b124af40aba62c0840790d46ed0fe80a2
Signed-off-by: Himanshu Sahdev <himanshusah@hcl.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35365
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Himanshu Sahdev 2019-09-12 12:02:54 +05:30 committed by Patrick Georgi
parent df02f7aed8
commit 8dc95ddbd4
2 changed files with 75 additions and 4 deletions
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46
src/mainboard/emulation/qemu-i440fx/fw_cfg.c
View File

@ -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)
;
}

33
src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h
View File

@ -67,11 +67,20 @@ enum fw_cfg_enum {
#define FW_CFG_INVALID 0xffff
/* width in bytes of fw_cfg control register */
#define FW_CFG_CTL_SIZE 0x02
/* fw_cfg "file name" is up to 56 characters (including terminating nul) */
#define FW_CFG_MAX_FILE_PATH 56
/* size in bytes of fw_cfg signature */
#define FW_CFG_SIG_SIZE 4
typedef struct FWCfgFile {
uint32_t size; /* file size */
uint16_t select; /* write this to 0x510 to read it */
uint16_t reserved;
char name[56];
char name[FW_CFG_MAX_FILE_PATH];
} FWCfgFile;
typedef struct FWCfgFiles {
@ -96,4 +105,26 @@ typedef struct FwCfgSmbios {
uint16_t fieldoffset;
} FwCfgSmbios;
/* FW_CFG_ID bits */
#define FW_CFG_VERSION 0x01
#define FW_CFG_VERSION_DMA 0x02
/* FW_CFG_DMA_CONTROL bits */
#define FW_CFG_DMA_CTL_ERROR 0x01
#define FW_CFG_DMA_CTL_READ 0x02
#define FW_CFG_DMA_CTL_SKIP 0x04
#define FW_CFG_DMA_CTL_SELECT 0x08
#define FW_CFG_DMA_CTL_WRITE 0x10
#define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */
/* Control as first field allows for different structures selected by this
* field, which might be useful in the future
*/
typedef struct FwCfgDmaAccess {
uint32_t control;
uint32_t length;
uint64_t address;
} FwCfgDmaAccess;
#endif /* FW_CFG_IF_H */