diff options
Diffstat (limited to 'chipset_enable.c')
| -rw-r--r-- | chipset_enable.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/chipset_enable.c b/chipset_enable.c index 4ba5bda..dff5d40 100644 --- a/chipset_enable.c +++ b/chipset_enable.c @@ -660,6 +660,8 @@ static int enable_flash_sb600(struct pci_dev *dev, const char *name) { uint32_t tmp, prot; uint8_t reg; + struct pci_dev *smbus_dev; + int has_spi = 1; /* Clear ROM protect 0-3. */ for (reg = 0x50; reg < 0x60; reg += 4) { @@ -688,12 +690,47 @@ static int enable_flash_sb600(struct pci_dev *dev, const char *name) tmp &= 0xfffffff0; /* remove low 4 bits (reserved) */ printf_debug("SPI base address is at 0x%x\n", tmp); + /* If the BAR has address 0, it is unlikely SPI is used. */ + if (!tmp) + has_spi = 0; + /* Physical memory can only be mapped at page (4k) boundaries */ sb600_spibar = physmap("SB600 SPI registers", tmp & 0xfffff000, 0x1000); /* The low bits of the SPI base address are used as offset into the mapped page */ sb600_spibar += tmp & 0xfff; - flashbus = BUS_TYPE_SB600_SPI; + /* Look for the SMBus device. */ + smbus_dev = pci_dev_find(0x1002, 0x4385); + + if (!smbus_dev) { + fprintf(stderr, "ERROR: SMBus device not found. Not enabling SPI.\n"); + has_spi = 0; + } else { + /* Note about the bit tests below: If a bit is zero, the GPIO is SPI. */ + /* GPIO11/SPI_DO and GPIO12/SPI_DI status */ + reg = pci_read_byte(smbus_dev, 0xAB); + reg &= 0xC0; + printf_debug("GPIO11 used for %s\n", (reg & (1 << 6)) ? "GPIO" : "SPI_DO"); + printf_debug("GPIO12 used for %s\n", (reg & (1 << 7)) ? "GPIO" : "SPI_DI"); + if (reg != 0x00) + has_spi = 0; + /* GPIO31/SPI_HOLD and GPIO32/SPI_CS status */ + reg = pci_read_byte(smbus_dev, 0x83); + reg &= 0xC0; + printf_debug("GPIO31 used for %s\n", (reg & (1 << 6)) ? "GPIO" : "SPI_HOLD"); + printf_debug("GPIO32 used for %s\n", (reg & (1 << 7)) ? "GPIO" : "SPI_CS"); + if (reg != 0x00) + has_spi = 0; + /* GPIO47/SPI_CLK status */ + reg = pci_read_byte(smbus_dev, 0xA7); + reg &= 0x40; + printf_debug("GPIO47 used for %s\n", (reg & (1 << 6)) ? "GPIO" : "SPI_CLK"); + if (reg != 0x00) + has_spi = 0; + } + + if (has_spi) + flashbus = BUS_TYPE_SB600_SPI; /* Force enable SPI ROM in SB600 PM register. * If we enable SPI ROM here, we have to disable it after we leave. |
