+++ /dev/null
---- /dev/null
-+++ b/Documentation/x86/rdc.txt
-@@ -0,0 +1,69 @@
-+
-+Introduction
-+============
-+
-+RDC (http://www.rdc.com.tw) have been manufacturing x86-compatible SoC
-+(system-on-chips) for a number of years. They are not the fastest of
-+CPUs (clock speeds ranging from 133-150MHz) but 486SX compatibility
-+coupled with very low power consumption[1] and low cost make them ideal
-+for embedded applications.
-+
-+
-+Where to find
-+=============
-+
-+RDC chips show up in numerous embedded devices, but be careful since
-+many of them will not run Linux 2.6 without significant expertise.
-+
-+There are several variants of what the linux kernel refers to generically
-+as RDC321X: R8610, R321x, S3282 and AMRISC20000.
-+
-+R321x: Found in various routers, see the OpenWrt project for details,
-+ http://wiki.openwrt.org/oldwiki/rdcport
-+
-+R8610: Found on the RDC evaluation board
-+ http://www.ivankuten.com/system-on-chip-soc/rdc-r8610/
-+
-+AMRISC20000: Found in the MGB-100 wireless hard disk
-+ http://tintuc.no-ip.com/linux/tipps/mgb100/
-+
-+S3282: Found in various NAS devices, including the Bifferboard
-+ http://www.bifferos.com
-+
-+
-+Kernel Configuration
-+====================
-+
-+Add support for this CPU with CONFIG_X86_RDC321X. Ensure that maths
-+emulation is included (CONFIG_MATH_EMULATION selected) and avoid MCE
-+(CONFIG_X86_MCE not selected).
-+
-+
-+CPU detection
-+=============
-+
-+None of these chips support the cpuid instruction, so as with some
-+other x86 compatible SoCs, we must check the north bridge and look
-+for specific 'signature' PCI device config.
-+
-+The current detection code has been tested only on the Bifferboard
-+(S3282 CPU), please send bug reports or success stories with
-+other devices to bifferos@yahoo.co.uk.
-+
-+
-+Credits
-+=======
-+
-+Many thanks to RDC for providing the customer codes to allow
-+detection of all known variants, without which this detection code
-+would have been very hard to ascertain.
-+
-+
-+References
-+==========
-+
-+[1] S3282 in certain NAS solutions consumes less than 1W
-+
-+
-+mark@bifferos.com 2009
-+
---- a/arch/x86/Kconfig
-+++ b/arch/x86/Kconfig
-@@ -403,6 +403,7 @@ config X86_RDC321X
- bool "RDC R-321x SoC"
- depends on X86_32
- depends on X86_EXTENDED_PLATFORM
-+ select PCI
- select M486
- select X86_REBOOTFIXUPS
- select EMBEDDED
---- a/arch/x86/include/asm/processor.h
-+++ b/arch/x86/include/asm/processor.h
-@@ -122,7 +122,8 @@ struct cpuinfo_x86 {
- #define X86_VENDOR_CENTAUR 5
- #define X86_VENDOR_TRANSMETA 7
- #define X86_VENDOR_NSC 8
--#define X86_VENDOR_NUM 9
-+#define X86_VENDOR_RDC 9
-+#define X86_VENDOR_NUM 10
-
- #define X86_VENDOR_UNKNOWN 0xff
-
---- a/arch/x86/kernel/cpu/Makefile
-+++ b/arch/x86/kernel/cpu/Makefile
-@@ -24,6 +24,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix
- obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
- obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
- obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
-+obj-$(CONFIG_X86_RDC321X) += rdc.o
-
- obj-$(CONFIG_PERF_EVENTS) += perf_event.o
-
---- /dev/null
-+++ b/arch/x86/kernel/cpu/rdc.c
-@@ -0,0 +1,69 @@
-+/*
-+ * See Documentation/x86/rdc.txt
-+ *
-+ * mark@bifferos.com
-+ */
-+
-+#include <linux/pci.h>
-+#include <asm/pci-direct.h>
-+#include "cpu.h"
-+
-+
-+static void __cpuinit rdc_identify(struct cpuinfo_x86 *c)
-+{
-+ u16 vendor, device;
-+ u32 customer_id;
-+
-+ if (!early_pci_allowed())
-+ return;
-+
-+ /* RDC CPU is SoC (system-on-chip), Northbridge is always present */
-+ vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
-+ device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
-+
-+ if (vendor != PCI_VENDOR_ID_RDC || device != PCI_DEVICE_ID_RDC_R6020)
-+ return; /* not RDC */
-+ /*
-+ * NB: We could go on and check other devices, e.g. r6040 NIC, but
-+ * that's probably overkill
-+ */
-+
-+ customer_id = read_pci_config(0, 0, 0, 0x90);
-+
-+ switch (customer_id) {
-+ /* id names are from RDC */
-+ case 0x00321000:
-+ strcpy(c->x86_model_id, "R3210/R3211");
-+ break;
-+ case 0x00321001:
-+ strcpy(c->x86_model_id, "AMITRISC20000/20010");
-+ break;
-+ case 0x00321002:
-+ strcpy(c->x86_model_id, "R3210X/Edimax");
-+ break;
-+ case 0x00321003:
-+ strcpy(c->x86_model_id, "R3210/Kcodes");
-+ break;
-+ case 0x00321004: /* tested */
-+ strcpy(c->x86_model_id, "S3282/CodeTek");
-+ break;
-+ case 0x00321007:
-+ strcpy(c->x86_model_id, "R8610");
-+ break;
-+ default:
-+ pr_info("RDC CPU: Unrecognised Customer ID (0x%x) please report to linux-kernel@vger.kernel.org\n", customer_id);
-+ break;
-+ }
-+
-+ strcpy(c->x86_vendor_id, "RDC");
-+ c->x86_vendor = X86_VENDOR_RDC;
-+}
-+
-+static const struct cpu_dev __cpuinitconst rdc_cpu_dev = {
-+ .c_vendor = "RDC",
-+ .c_ident = { "RDC" },
-+ .c_identify = rdc_identify,
-+ .c_x86_vendor = X86_VENDOR_RDC,
-+};
-+
-+cpu_dev_register(rdc_cpu_dev);
projects / openwrt.git / blobdiff