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authorEric Biederman <ebiederm@xmission.com>2003-06-11 21:55:00 +0000
committerEric Biederman <ebiederm@xmission.com>2003-06-11 21:55:00 +0000
commit05f26fcb571340b17beaca16939a025a9c0b4cdd (patch)
treea8c830fedbd545bf11c72c6d20b9e0715ffb6fdf /src/southbridge/amd
parentc927b022c23a55e84d5d6aaac1deb7b95e25a878 (diff)
- Factoring of auto.c
- Implementation of fallback/normal support for the amd solo board - Minor bugfix in romcc git-svn-id: svn://svn.coreboot.org/coreboot/trunk@867 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/southbridge/amd')
-rw-r--r--src/southbridge/amd/amd8111/amd8111_early_smbus.c108
-rw-r--r--src/southbridge/amd/amd8111/amd8111_enable_rom.c18
2 files changed, 126 insertions, 0 deletions
diff --git a/src/southbridge/amd/amd8111/amd8111_early_smbus.c b/src/southbridge/amd/amd8111/amd8111_early_smbus.c
new file mode 100644
index 0000000000..b0b8e4955f
--- /dev/null
+++ b/src/southbridge/amd/amd8111/amd8111_early_smbus.c
@@ -0,0 +1,108 @@
+#define SMBUS_IO_BASE 0x1000
+
+#define SMBGSTATUS 0xe0
+#define SMBGCTL 0xe2
+#define SMBHSTADDR 0xe4
+#define SMBHSTDAT 0xe6
+#define SMBHSTCMD 0xe8
+#define SMBHSTFIFO 0xe9
+
+#define SMBUS_TIMEOUT (100*1000*10)
+
+static void enable_smbus(void)
+{
+ uint32_t addr;
+ addr = pci_locate_device(PCI_ID(0x1022, 0x746b), 0);
+ if (addr == ~0U) {
+ die("SMBUS controller not found\r\n");
+ }
+ uint8_t enable;
+ print_debug("SMBus controller enabled\r\n");
+ pci_write_config32(addr + 0x58, SMBUS_IO_BASE | 1);
+ enable = pci_read_config8(addr + 0x41);
+ pci_write_config8(addr + 0x41, enable | (1 << 7));
+}
+
+
+static inline void smbus_delay(void)
+{
+ outb(0x80, 0x80);
+}
+
+static int smbus_wait_until_ready(void)
+{
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned short val;
+ smbus_delay();
+ val = inw(SMBUS_IO_BASE + SMBGSTATUS);
+ if ((val & 0x800) == 0) {
+ break;
+ }
+ } while(--loops);
+ return loops?0:-1;
+}
+
+static int smbus_wait_until_done(void)
+{
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned short val;
+ smbus_delay();
+
+ val = inw(SMBUS_IO_BASE + SMBGSTATUS);
+ if (((val & 0x8) == 0) || ((val & 0x437) != 0)) {
+ break;
+ }
+ } while(--loops);
+ return loops?0:-1;
+}
+
+static int smbus_read_byte(unsigned device, unsigned address)
+{
+ unsigned char global_control_register;
+ unsigned char global_status_register;
+ unsigned char byte;
+
+ if (smbus_wait_until_ready() < 0) {
+ return -1;
+ }
+
+ /* setup transaction */
+ /* disable interrupts */
+ outw(inw(SMBUS_IO_BASE + SMBGCTL) & ~((1<<10)|(1<<9)|(1<<8)|(1<<4)), SMBUS_IO_BASE + SMBGCTL);
+ /* set the device I'm talking too */
+ outw(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBHSTADDR);
+ /* set the command/address... */
+ outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
+ /* set up for a byte data read */
+ outw((inw(SMBUS_IO_BASE + SMBGCTL) & ~7) | (0x2), SMBUS_IO_BASE + SMBGCTL);
+
+ /* clear any lingering errors, so the transaction will run */
+ /* Do I need to write the bits to a 1 to clear an error? */
+ outw(inw(SMBUS_IO_BASE + SMBGSTATUS), SMBUS_IO_BASE + SMBGSTATUS);
+
+ /* clear the data word...*/
+ outw(0, SMBUS_IO_BASE + SMBHSTDAT);
+
+ /* start the command */
+ outw((inw(SMBUS_IO_BASE + SMBGCTL) | (1 << 3)), SMBUS_IO_BASE + SMBGCTL);
+
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done() < 0) {
+ return -1;
+ }
+
+ global_status_register = inw(SMBUS_IO_BASE + SMBGSTATUS);
+
+ /* read results of transaction */
+ byte = inw(SMBUS_IO_BASE + SMBHSTDAT) & 0xff;
+
+ if (global_status_register != (1 << 4)) {
+ return -1;
+ }
+ return byte;
+}
diff --git a/src/southbridge/amd/amd8111/amd8111_enable_rom.c b/src/southbridge/amd/amd8111/amd8111_enable_rom.c
new file mode 100644
index 0000000000..d6045c3620
--- /dev/null
+++ b/src/southbridge/amd/amd8111/amd8111_enable_rom.c
@@ -0,0 +1,18 @@
+
+static void amd8111_enable_rom(void)
+{
+ unsigned char byte;
+ uint32_t addr;
+
+ /* Enable 4MB rom access at 0xFFC00000 - 0xFFFFFFFF */
+ /* Locate the amd8111 */
+ addr = pci_locate_device(PCI_ID(0x1022, 0x7468), 0);
+
+ /* Refine the address to point at the rom enable byte */
+ addr += 0x43;
+
+ /* Set the 4MB enable bit bit */
+ byte = pci_read_config8(addr);
+ byte |= 0x80;
+ pci_write_config8(addr, byte);
+}