diff options
Diffstat (limited to 'drivers/mtd/nand/cs553x_nand.c')
| -rw-r--r-- | drivers/mtd/nand/cs553x_nand.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/drivers/mtd/nand/cs553x_nand.c b/drivers/mtd/nand/cs553x_nand.c index 1e0348ae325f..e0a1d386e581 100644 --- a/drivers/mtd/nand/cs553x_nand.c +++ b/drivers/mtd/nand/cs553x_nand.c @@ -31,6 +31,10 @@ #define NR_CS553X_CONTROLLERS 4 +#define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */ +#define CAP_CS5535 0x2df000ULL +#define CAP_CS5536 0x5df500ULL + /* NAND Timing MSRs */ #define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */ #define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */ @@ -252,17 +256,40 @@ out: return err; } +static int is_geode(void) +{ + /* These are the CPUs which will have a CS553[56] companion chip */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && + boot_cpu_data.x86 == 5 && + boot_cpu_data.x86_model == 10) + return 1; /* Geode LX */ + + if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC || + boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) && + boot_cpu_data.x86 == 5 && + boot_cpu_data.x86_model == 5) + return 1; /* Geode GX (née GX2) */ + + return 0; +} + static int __init cs553x_init(void) { int err = -ENXIO; int i; uint64_t val; - /* Check whether we actually have a CS5535 or CS5536 */ - if (!pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, NULL) && - !pci_find_device(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA, NULL)) + /* If the CPU isn't a Geode GX or LX, abort */ + if (!is_geode()) + return -ENXIO; + + /* If it doesn't have the CS553[56], abort */ + rdmsrl(MSR_DIVIL_GLD_CAP, val); + val &= ~0xFFULL; + if (val != CAP_CS5535 && val != CAP_CS5536) return -ENXIO; + /* If it doesn't have the NAND controller enabled, abort */ rdmsrl(MSR_DIVIL_BALL_OPTS, val); if (val & 1) { printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n"); |