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Message-Id: <201005201658.49187.florian@openwrt.org>
Date: Thu, 20 May 2010 16:58:48 +0200
From: Florian Fainelli <florian@...nwrt.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>, mingo@...e.hu,
"linux-kernel" <linux-kernel@...r.kernel.org>, andi@...stfloor.org
Subject: Re: [PATCH v3] x86: CPU detection for RDC System-on-Chip
On Wednesday 19 May 2010 09:27:12 Florian Fainelli wrote:
> From: Mark Kelly <mark@...feros.com>
>
> The RDC System-on-Chip i486 compatible core does not support the cpuid
> instruction and specific detection logic is required for this chip. The
> patch below adds proper vendor and SoC type detection.
Is this version acceptable like it is now?
Thank you for your answer.
>
> Signed-off-by: Mark Kelly <mark@...feros.com>
> Tested-by: Florian Fainelli <florian@...nwrt.org>
> ---
> Changes from v3:
> - read vendor and device id with a single 32-bits read
>
> Changes from v2:
> - change report url to bugzilla.kernel.org
> - set vendor name to RDC even if customer id is not known
>
> diff --git a/Documentation/x86/rdc.txt b/Documentation/x86/rdc.txt
> new file mode 100644
> index 0000000..f3dc7cf
> --- /dev/null
> +++ b/Documentation/x86/rdc.txt
> @@ -0,0 +1,67 @@
> +
> +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.
> +
> +If you run a kernel on an unsupported customer id device, please file
> +a bug with your customer id to: http://bugzilla.kernel.org/.
> +
> +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@...feros.com 2009
> +
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 39e8e10..21b02f2 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -419,6 +419,7 @@ config X86_RDC321X
> bool "RDC R-321x SoC"
> depends on X86_32
> depends on X86_EXTENDED_PLATFORM
> + select PCI
> select M486
> select X86_REBOOTFIXUPS
> ---help---
> diff --git a/arch/x86/include/asm/processor.h
> b/arch/x86/include/asm/processor.h index 5a51379..eddf979 100644
> --- 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
>
> diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
> index 3a785da..af2d4a6 100644
> --- a/arch/x86/kernel/cpu/Makefile
> +++ b/arch/x86/kernel/cpu/Makefile
> @@ -25,6 +25,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
> obj-$(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
>
> diff --git a/arch/x86/kernel/cpu/rdc.c b/arch/x86/kernel/cpu/rdc.c
> new file mode 100644
> index 0000000..c2bcdcc
> --- /dev/null
> +++ b/arch/x86/kernel/cpu/rdc.c
> @@ -0,0 +1,73 @@
> +/*
> + * See Documentation/x86/rdc.txt
> + *
> + * mark@...feros.com
> + */
> +
> +#include <linux/pci.h>
> +#include <asm/pci-direct.h>
> +#include "cpu.h"
> +
> +
> +static void __cpuinit rdc_identify(struct cpuinfo_x86 *c)
> +{
> + u32 id;
> + u16 vendor, device;
> + u32 customer_id;
> +
> + if (!early_pci_allowed())
> + return;
> +
> + /* RDC CPU is SoC (system-on-chip), Northbridge is always present */
> + id = read_pci_config(0, 0, 0, PCI_VENDOR_ID);
> + vendor = id & 0xffff;
> + device = (id >> 16) & 0xffff;
> +
> + 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: http://bugzilla.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);
--
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