mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
177 lines
4.6 KiB
Diff
177 lines
4.6 KiB
Diff
--- /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
|
|
@@ -464,6 +464,7 @@ 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
|
|
@@ -119,7 +119,8 @@ 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
|
|
@@ -26,6 +26,7 @@ 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);
|