Root/target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch

1--- /dev/null
2+++ b/Documentation/x86/rdc.txt
3@@ -0,0 +1,69 @@
4+
5+Introduction
6+============
7+
8+RDC (http://www.rdc.com.tw) have been manufacturing x86-compatible SoC
9+(system-on-chips) for a number of years. They are not the fastest of
10+CPUs (clock speeds ranging from 133-150MHz) but 486SX compatibility
11+coupled with very low power consumption[1] and low cost make them ideal
12+for embedded applications.
13+
14+
15+Where to find
16+=============
17+
18+RDC chips show up in numerous embedded devices, but be careful since
19+many of them will not run Linux 2.6 without significant expertise.
20+
21+There are several variants of what the linux kernel refers to generically
22+as RDC321X: R8610, R321x, S3282 and AMRISC20000.
23+
24+R321x: Found in various routers, see the OpenWrt project for details,
25+ http://wiki.openwrt.org/oldwiki/rdcport
26+
27+R8610: Found on the RDC evaluation board
28+ http://www.ivankuten.com/system-on-chip-soc/rdc-r8610/
29+
30+AMRISC20000: Found in the MGB-100 wireless hard disk
31+ http://tintuc.no-ip.com/linux/tipps/mgb100/
32+
33+S3282: Found in various NAS devices, including the Bifferboard
34+ http://www.bifferos.com
35+
36+
37+Kernel Configuration
38+====================
39+
40+Add support for this CPU with CONFIG_X86_RDC321X. Ensure that maths
41+emulation is included (CONFIG_MATH_EMULATION selected) and avoid MCE
42+(CONFIG_X86_MCE not selected).
43+
44+
45+CPU detection
46+=============
47+
48+None of these chips support the cpuid instruction, so as with some
49+other x86 compatible SoCs, we must check the north bridge and look
50+for specific 'signature' PCI device config.
51+
52+The current detection code has been tested only on the Bifferboard
53+(S3282 CPU), please send bug reports or success stories with
54+other devices to bifferos@yahoo.co.uk.
55+
56+
57+Credits
58+=======
59+
60+Many thanks to RDC for providing the customer codes to allow
61+detection of all known variants, without which this detection code
62+would have been very hard to ascertain.
63+
64+
65+References
66+==========
67+
68+[1] S3282 in certain NAS solutions consumes less than 1W
69+
70+
71+mark@bifferos.com 2009
72+
73--- a/arch/x86/Kconfig
74+++ b/arch/x86/Kconfig
75@@ -464,6 +464,7 @@ config X86_RDC321X
76     bool "RDC R-321x SoC"
77     depends on X86_32
78     depends on X86_EXTENDED_PLATFORM
79+ select PCI
80     select M486
81     select X86_REBOOTFIXUPS
82     select EMBEDDED
83--- a/arch/x86/include/asm/processor.h
84+++ b/arch/x86/include/asm/processor.h
85@@ -119,7 +119,8 @@ struct cpuinfo_x86 {
86 #define X86_VENDOR_CENTAUR 5
87 #define X86_VENDOR_TRANSMETA 7
88 #define X86_VENDOR_NSC 8
89-#define X86_VENDOR_NUM 9
90+#define X86_VENDOR_RDC 9
91+#define X86_VENDOR_NUM 10
92 
93 #define X86_VENDOR_UNKNOWN 0xff
94 
95--- a/arch/x86/kernel/cpu/Makefile
96+++ b/arch/x86/kernel/cpu/Makefile
97@@ -26,6 +26,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix
98 obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
99 obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
100 obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
101+obj-$(CONFIG_X86_RDC321X) += rdc.o
102 
103 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
104 
105--- /dev/null
106+++ b/arch/x86/kernel/cpu/rdc.c
107@@ -0,0 +1,69 @@
108+/*
109+ * See Documentation/x86/rdc.txt
110+ *
111+ * mark@bifferos.com
112+ */
113+
114+#include <linux/pci.h>
115+#include <asm/pci-direct.h>
116+#include "cpu.h"
117+
118+
119+static void __cpuinit rdc_identify(struct cpuinfo_x86 *c)
120+{
121+ u16 vendor, device;
122+ u32 customer_id;
123+
124+ if (!early_pci_allowed())
125+ return;
126+
127+ /* RDC CPU is SoC (system-on-chip), Northbridge is always present */
128+ vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
129+ device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
130+
131+ if (vendor != PCI_VENDOR_ID_RDC || device != PCI_DEVICE_ID_RDC_R6020)
132+ return; /* not RDC */
133+ /*
134+ * NB: We could go on and check other devices, e.g. r6040 NIC, but
135+ * that's probably overkill
136+ */
137+
138+ customer_id = read_pci_config(0, 0, 0, 0x90);
139+
140+ switch (customer_id) {
141+ /* id names are from RDC */
142+ case 0x00321000:
143+ strcpy(c->x86_model_id, "R3210/R3211");
144+ break;
145+ case 0x00321001:
146+ strcpy(c->x86_model_id, "AMITRISC20000/20010");
147+ break;
148+ case 0x00321002:
149+ strcpy(c->x86_model_id, "R3210X/Edimax");
150+ break;
151+ case 0x00321003:
152+ strcpy(c->x86_model_id, "R3210/Kcodes");
153+ break;
154+ case 0x00321004: /* tested */
155+ strcpy(c->x86_model_id, "S3282/CodeTek");
156+ break;
157+ case 0x00321007:
158+ strcpy(c->x86_model_id, "R8610");
159+ break;
160+ default:
161+ pr_info("RDC CPU: Unrecognised Customer ID (0x%x) please report to linux-kernel@vger.kernel.org\n", customer_id);
162+ break;
163+ }
164+
165+ strcpy(c->x86_vendor_id, "RDC");
166+ c->x86_vendor = X86_VENDOR_RDC;
167+}
168+
169+static const struct cpu_dev __cpuinitconst rdc_cpu_dev = {
170+ .c_vendor = "RDC",
171+ .c_ident = { "RDC" },
172+ .c_identify = rdc_identify,
173+ .c_x86_vendor = X86_VENDOR_RDC,
174+};
175+
176+cpu_dev_register(rdc_cpu_dev);
177

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