177 lines
4.6 KiB
Diff
177 lines
4.6 KiB
Diff
--- /dev/null
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+++ b/Documentation/x86/rdc.txt
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@@ -0,0 +1,69 @@
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+
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+Introduction
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+============
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+
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+RDC (http://www.rdc.com.tw) have been manufacturing x86-compatible SoC
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+(system-on-chips) for a number of years. They are not the fastest of
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+CPUs (clock speeds ranging from 133-150MHz) but 486SX compatibility
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+coupled with very low power consumption[1] and low cost make them ideal
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+for embedded applications.
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+
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+
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+Where to find
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+=============
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+
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+RDC chips show up in numerous embedded devices, but be careful since
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+many of them will not run Linux 2.6 without significant expertise.
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+
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+There are several variants of what the linux kernel refers to generically
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+as RDC321X: R8610, R321x, S3282 and AMRISC20000.
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+
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+R321x: Found in various routers, see the OpenWrt project for details,
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+ http://wiki.openwrt.org/oldwiki/rdcport
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+
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+R8610: Found on the RDC evaluation board
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+ http://www.ivankuten.com/system-on-chip-soc/rdc-r8610/
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+
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+AMRISC20000: Found in the MGB-100 wireless hard disk
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+ http://tintuc.no-ip.com/linux/tipps/mgb100/
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+
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+S3282: Found in various NAS devices, including the Bifferboard
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+ http://www.bifferos.com
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+
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+
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+Kernel Configuration
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+====================
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+
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+Add support for this CPU with CONFIG_X86_RDC321X. Ensure that maths
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+emulation is included (CONFIG_MATH_EMULATION selected) and avoid MCE
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+(CONFIG_X86_MCE not selected).
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+
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+
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+CPU detection
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+=============
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+
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+None of these chips support the cpuid instruction, so as with some
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+other x86 compatible SoCs, we must check the north bridge and look
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+for specific 'signature' PCI device config.
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+
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+The current detection code has been tested only on the Bifferboard
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+(S3282 CPU), please send bug reports or success stories with
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+other devices to bifferos@yahoo.co.uk.
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+
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+
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+Credits
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+=======
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+
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+Many thanks to RDC for providing the customer codes to allow
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+detection of all known variants, without which this detection code
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+would have been very hard to ascertain.
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+
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+
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+References
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+==========
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+
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+[1] S3282 in certain NAS solutions consumes less than 1W
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+
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+
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+mark@bifferos.com 2009
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+
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--- a/arch/x86/Kconfig
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+++ b/arch/x86/Kconfig
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@@ -478,6 +478,7 @@ config X86_RDC321X
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bool "RDC R-321x SoC"
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depends on X86_32
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depends on X86_EXTENDED_PLATFORM
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+ select PCI
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select M486
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select X86_REBOOTFIXUPS
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select EMBEDDED
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--- a/arch/x86/include/asm/processor.h
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+++ b/arch/x86/include/asm/processor.h
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@@ -137,7 +137,8 @@ struct cpuinfo_x86 {
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#define X86_VENDOR_CENTAUR 5
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#define X86_VENDOR_TRANSMETA 7
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#define X86_VENDOR_NSC 8
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-#define X86_VENDOR_NUM 9
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+#define X86_VENDOR_RDC 9
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+#define X86_VENDOR_NUM 10
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#define X86_VENDOR_UNKNOWN 0xff
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--- a/arch/x86/kernel/cpu/Makefile
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+++ b/arch/x86/kernel/cpu/Makefile
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@@ -26,6 +26,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix
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obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
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obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
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obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
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+obj-$(CONFIG_X86_RDC321X) += rdc.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o
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--- /dev/null
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+++ b/arch/x86/kernel/cpu/rdc.c
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@@ -0,0 +1,69 @@
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+/*
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+ * See Documentation/x86/rdc.txt
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+ *
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+ * mark@bifferos.com
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+ */
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+
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+#include <linux/pci.h>
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+#include <asm/pci-direct.h>
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+#include "cpu.h"
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+
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+
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+static void __cpuinit rdc_identify(struct cpuinfo_x86 *c)
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+{
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+ u16 vendor, device;
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+ u32 customer_id;
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+
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+ if (!early_pci_allowed())
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+ return;
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+
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+ /* RDC CPU is SoC (system-on-chip), Northbridge is always present */
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+ vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
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+ device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
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+
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+ if (vendor != PCI_VENDOR_ID_RDC || device != PCI_DEVICE_ID_RDC_R6020)
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+ return; /* not RDC */
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+ /*
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+ * NB: We could go on and check other devices, e.g. r6040 NIC, but
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+ * that's probably overkill
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+ */
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+
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+ customer_id = read_pci_config(0, 0, 0, 0x90);
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+
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+ switch (customer_id) {
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+ /* id names are from RDC */
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+ case 0x00321000:
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+ strcpy(c->x86_model_id, "R3210/R3211");
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+ break;
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+ case 0x00321001:
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+ strcpy(c->x86_model_id, "AMITRISC20000/20010");
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+ break;
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+ case 0x00321002:
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+ strcpy(c->x86_model_id, "R3210X/Edimax");
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+ break;
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+ case 0x00321003:
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+ strcpy(c->x86_model_id, "R3210/Kcodes");
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+ break;
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+ case 0x00321004: /* tested */
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+ strcpy(c->x86_model_id, "S3282/CodeTek");
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+ break;
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+ case 0x00321007:
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+ strcpy(c->x86_model_id, "R8610");
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+ break;
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+ default:
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+ pr_info("RDC CPU: Unrecognised Customer ID (0x%x) please report to linux-kernel@vger.kernel.org\n", customer_id);
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+ break;
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+ }
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+
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+ strcpy(c->x86_vendor_id, "RDC");
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+ c->x86_vendor = X86_VENDOR_RDC;
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+}
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+
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+static const struct cpu_dev __cpuinitconst rdc_cpu_dev = {
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+ .c_vendor = "RDC",
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+ .c_ident = { "RDC" },
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+ .c_identify = rdc_identify,
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+ .c_x86_vendor = X86_VENDOR_RDC,
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+};
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+
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+cpu_dev_register(rdc_cpu_dev);
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