Add support for Realtek Media Player SoCs

Hi,

I added support for at least one of the Realtek "Galaxy" SoCs to recent 2.6.36 kernel. Most of the patch is based on existing linux-mips code and a 2.6.12 kernel source released by some of Realtek customers.

Currently, this allows to start the kernel and setup serial console. Further development/porting will have to be done for additional platform devices.

This code is tested on a Realtek Mars SoC. Commercial product name is rtd1073dd but cpu/soc id is 0x1283. Other SoCs (Venus,Jupiter,Neptune) have not been tested, yet.

Quoted 3 lines · Arnaud Patard (Rtp)

Please read Documentation/SubmittingPatches. One big patch is just impossible to review (at least for me), please split it in fewer chunks.

I already spoke to Ralf about this. I wanted to submit smaller patches but as adding initial support is "one logical change" I stuck to one large patch for now. But I understand the need for a nicer way to review the changes. Although most of them are new files for the mach anyway.

Quoted 4 lines

Do you have an exact status of the different platform device support ? How do you deal with the audio/video support (for instance firmware loading & their rpc stuff) ?

I have no exact status except the 2.6.12 source that is delivered with most (all?) of the media players. As far as I checked the a/v code everything interesting is done in userspace by ioctls. I don't like it that way but for a first shot it would be easier to keep it that way and then start to port it to common kernel interfaces. Can't tell now if this will be possible at all without any documentation available.

The firmware for the Lexras gets copied to reserved mem areas by the bootloader.

Quoted 1 line

From the debug messages of the original bootloader and kernel I would guess

you can halt, reset and run the Lexras by writing into some registers.

Other devices include sata, usb, and eth. The eth is a rtl8139c+ where there is a driver available already but relies on pci. Realtek itself took this code and modified it for bus accesses. Usb and sata drivers are there from the 2.6.12 but again I did no in-depth study of the code, yet.

Quoted 3 lines

Do you know the differences between the different versions and/or have public specs of the SoCs ?

I cannot tell you the exact differences between the SoCs and I have no documentation at all.

Quoted 4 lines

Also, I'm seeing a lot of rtd128x in the file names... Commercial name for the Venus is rtd1261 for instance. I find this really confusing. I would be tempted to use mach-realtek but I don't know enough the realtek mips SoCs to say if it's a good idea.

Yeah, this is confusing but may be caused by the confusing way realtek calls their chips. I always thought the rtd1261 is Mars and rtd1071 is Venus (so the other way round). But the chip id of the rtd1071 tells me it is Mars and I have no other SoC available.

I chose rtd128x because the chip id register for all SoCs named by planets is 0x1281, 0x1282, 0x1283, aso. Therefore, I thought using value-based naming would be nicer than weird commercial names.

I guess mach-realtek would be to generic (think of rtl8181) but maybe galaxy could be used because of the planet names of the SoCs.

Please read Documentation/SubmittingPatches. One big patch is just impossible to review (at least for me), please split it in fewer chunks.

I added support for at least one of the Realtek "Galaxy" SoCs to recent 2.6.36 kernel. Most of the patch is based on existing linux-mips code and a 2.6.12 kernel source released by some of Realtek customers.

Currently, this allows to start the kernel and setup serial console. Further development/porting will have to be done for additional platform devices.

This code is tested on a Realtek Mars SoC. Commercial product name is rtd1073dd but cpu/soc id is 0x1283. Other SoCs (Venus,Jupiter,Neptune) have not been tested, yet.

Please comment on the patch and feel free to suggest changes that need to be done prior integration.

diff -uNr linux-2.6.36-vanilla/arch/mips/include/asm/mach-rtd128x/rtd128x-board.h linux-2.6.36/arch/mips/include/asm/mach-rtd128x/rtd128x-board.h

arch/mips/include/asm/mach-rtd128x/rtd128x-board.h +6 -0

@@ -0,0 +1,51 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */

arch/mips/rtd128x/common/board.c +20 -0

+++ linux-2.6.36/arch/mips/rtd128x/common/memory.c	2010-11-19 18:10:26.000000000 +0100

@@ -0,0 +1,202 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/pfn.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/page.h>
+#include <asm/sections.h>
+
+#include <asm/mips-boards/prom.h>
+#include <rtd128x-board.h>

arch/mips/rtd128x/common/board.c +1 -0

+device_initcall(rtd128x_devinit);

diff -uNr linux-2.6.36-vanilla/arch/mips/rtd128x/common/printk.c linux-2.6.36/arch/mips/rtd128x/common/printk.c

arch/mips/rtd128x/common/printk.c +6 -0

+#elif defined(CONFIG_CPU_MIPS32_R2)
+	base = (void *)0xbfc00000;
+#else
+#error NMI exception handler address not defined
+#endif
+}

arch/mips/rtd128x/common/setup.c +70 -0

+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/screen_info.h>
+#include <linux/notifier.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/ctype.h>
+#include <linux/cpu.h>
+#include <linux/time.h>
+
+#include <asm/bootinfo.h>
+#include <asm/irq.h>
+#include <asm/mips-boards/generic.h>
+#include <asm/mips-boards/prom.h>
+#include <asm/dma.h>
+#include <asm/time.h>
+#include <asm/asm.h>
+#include <asm/traps.h>
+#include <asm/reboot.h>
+#include <asm/asm-offsets.h>
+
+#include <rtd128x-board.h>
+
+extern void rtd128x_board_setup(void);
+
+#define VAL(n)		STR(n)
+
+/*
+ * Macros for loading addresses and storing registers:
+ * LONG_L_	Stringified version of LONG_L for use in asm() statement
+ * LONG_S_	Stringified version of LONG_S for use in asm() statement
+ * PTR_LA_	Stringified version of PTR_LA for use in asm() statement
+ * REG_SIZE	Number of 8-bit bytes in a full width register
+ */
+#define LONG_L_		VAL(LONG_L) " "
+#define LONG_S_		VAL(LONG_S) " "
+#define PTR_LA_		VAL(PTR_LA) " "
+
+#ifdef CONFIG_64BIT
+#warning TODO: 64-bit code needs to be verified
+#define REG_SIZE	"8"	/* In bytes */
+#endif
+
+#ifdef CONFIG_32BIT
+#define REG_SIZE	"4"	/* In bytes */
+#endif
+
+static void register_panic_notifier(void);
+static int panic_handler(struct notifier_block *notifier_block,
+			 unsigned long event, void *cause_string);
+
+/*
+ * Install a panic notifier for platform-specific diagnostics
+ */
+static void register_panic_notifier()
+{
+	static struct notifier_block panic_notifier = {
+		.notifier_call = panic_handler,
+		.next = NULL,
+		.priority = INT_MAX
+	};
+	atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
+}
+
+static int panic_handler(struct notifier_block *notifier_block,
+			 unsigned long event, void *cause_string)
+{
+	struct pt_regs my_regs;
+
+	/* Save all of the registers */

arch/mips/rtd128x/common/time.c +8 -0

@@ -0,0 +1,87 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/types.h>