From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001
From: Srikant Patnaik
Date: Sun, 11 Jan 2015 12:28:04 +0530
Subject: Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
---
 arch/mips/powertv/powertv_setup.c | 320 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 320 insertions(+)
 create mode 100644 arch/mips/powertv/powertv_setup.c

(limited to 'arch/mips/powertv/powertv_setup.c')

diff --git a/arch/mips/powertv/powertv_setup.c b/arch/mips/powertv/powertv_setup.c
new file mode 100644
index 00000000..3933c373
--- /dev/null
+++ b/arch/mips/powertv/powertv_setup.c
@@ -0,0 +1,320 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
+ * Portions copyright (C) 2009 Cisco Systems, Inc.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ */
+#include <linux/init.h>
+#include <linux/sched.h>
+#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/asm.h>
+#include <asm/traps.h>
+#include <asm/asm-offsets.h>
+#include "reset.h"
+
+#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);
+
+const char *get_system_type(void)
+{
+	return "PowerTV";
+}
+
+void __init plat_mem_setup(void)
+{
+	panic_on_oops = 1;
+	register_panic_notifier();
+
+#if 0
+	mips_pcibios_init();
+#endif
+	mips_reboot_setup();
+}
+
+/*
+ * 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 */
+	{
+		unsigned long	at, v0, v1; /* Must be on the stack */
+
+		/* Start by saving $at and v0 on the stack. We use $at
+		 * ourselves, but it looks like the compiler may use v0 or v1
+		 * to load the address of the pt_regs structure. We'll come
+		 * back later to store the registers in the pt_regs
+		 * structure. */
+		__asm__ __volatile__ (
+			".set	noat\n"
+			LONG_S_		"$at, %[at]\n"
+			LONG_S_		"$2, %[v0]\n"
+			LONG_S_		"$3, %[v1]\n"
+		:
+			[at] "=m" (at),
+			[v0] "=m" (v0),
+			[v1] "=m" (v1)
+		:
+		:	"at"
+		);
+
+		__asm__ __volatile__ (
+			".set	noat\n"
+			"move		$at, %[pt_regs]\n"
+
+			/* Argument registers */
+			LONG_S_		"$4, " VAL(PT_R4) "($at)\n"
+			LONG_S_		"$5, " VAL(PT_R5) "($at)\n"
+			LONG_S_		"$6, " VAL(PT_R6) "($at)\n"
+			LONG_S_		"$7, " VAL(PT_R7) "($at)\n"
+
+			/* Temporary regs */
+			LONG_S_		"$8, " VAL(PT_R8) "($at)\n"
+			LONG_S_		"$9, " VAL(PT_R9) "($at)\n"
+			LONG_S_		"$10, " VAL(PT_R10) "($at)\n"
+			LONG_S_		"$11, " VAL(PT_R11) "($at)\n"
+			LONG_S_		"$12, " VAL(PT_R12) "($at)\n"
+			LONG_S_		"$13, " VAL(PT_R13) "($at)\n"
+			LONG_S_		"$14, " VAL(PT_R14) "($at)\n"
+			LONG_S_		"$15, " VAL(PT_R15) "($at)\n"
+
+			/* "Saved" registers */
+			LONG_S_		"$16, " VAL(PT_R16) "($at)\n"
+			LONG_S_		"$17, " VAL(PT_R17) "($at)\n"
+			LONG_S_		"$18, " VAL(PT_R18) "($at)\n"
+			LONG_S_		"$19, " VAL(PT_R19) "($at)\n"
+			LONG_S_		"$20, " VAL(PT_R20) "($at)\n"
+			LONG_S_		"$21, " VAL(PT_R21) "($at)\n"
+			LONG_S_		"$22, " VAL(PT_R22) "($at)\n"
+			LONG_S_		"$23, " VAL(PT_R23) "($at)\n"
+
+			/* Add'l temp regs */
+			LONG_S_		"$24, " VAL(PT_R24) "($at)\n"
+			LONG_S_		"$25, " VAL(PT_R25) "($at)\n"
+
+			/* Kernel temp regs */
+			LONG_S_		"$26, " VAL(PT_R26) "($at)\n"
+			LONG_S_		"$27, " VAL(PT_R27) "($at)\n"
+
+			/* Global pointer, stack pointer, frame pointer and
+			 * return address */
+			LONG_S_		"$gp, " VAL(PT_R28) "($at)\n"
+			LONG_S_		"$sp, " VAL(PT_R29) "($at)\n"
+			LONG_S_		"$fp, " VAL(PT_R30) "($at)\n"
+			LONG_S_		"$ra, " VAL(PT_R31) "($at)\n"
+
+			/* Now we can get the $at and v0 registers back and
+			 * store them */
+			LONG_L_		"$8, %[at]\n"
+			LONG_S_		"$8, " VAL(PT_R1) "($at)\n"
+			LONG_L_		"$8, %[v0]\n"
+			LONG_S_		"$8, " VAL(PT_R2) "($at)\n"
+			LONG_L_		"$8, %[v1]\n"
+			LONG_S_		"$8, " VAL(PT_R3) "($at)\n"
+		:
+		:
+			[at] "m" (at),
+			[v0] "m" (v0),
+			[v1] "m" (v1),
+			[pt_regs] "r" (&my_regs)
+		:	"at", "t0"
+		);
+
+		/* Set the current EPC value to be the current location in this
+		 * function */
+		__asm__ __volatile__ (
+			".set	noat\n"
+		"1:\n"
+			PTR_LA_		"$at, 1b\n"
+			LONG_S_		"$at, %[cp0_epc]\n"
+		:
+			[cp0_epc] "=m" (my_regs.cp0_epc)
+		:
+		:	"at"
+		);
+
+		my_regs.cp0_cause = read_c0_cause();
+		my_regs.cp0_status = read_c0_status();
+	}
+
+	pr_crit("I'm feeling a bit sleepy. hmmmmm... perhaps a nap would... "
+		"zzzz... \n");
+
+	return NOTIFY_DONE;
+}
+
+/* Information about the RF MAC address, if one was supplied on the
+ * command line. */
+static bool have_rfmac;
+static u8 rfmac[ETH_ALEN];
+
+static int rfmac_param(char *p)
+{
+	u8	*q;
+	bool	is_high_nibble;
+	int	c;
+
+	/* Skip a leading "0x", if present */
+	if (*p == '0' && *(p+1) == 'x')
+		p += 2;
+
+	q = rfmac;
+	is_high_nibble = true;
+
+	for (c = (unsigned char) *p++;
+		isxdigit(c) && q - rfmac < ETH_ALEN;
+		c = (unsigned char) *p++) {
+		int	nibble;
+
+		nibble = (isdigit(c) ? (c - '0') :
+			(isupper(c) ? c - 'A' + 10 : c - 'a' + 10));
+
+		if (is_high_nibble)
+			*q = nibble << 4;
+		else
+			*q++ |= nibble;
+
+		is_high_nibble = !is_high_nibble;
+	}
+
+	/* If we parsed all the way to the end of the parameter value and
+	 * parsed all ETH_ALEN bytes, we have a usable RF MAC address */
+	have_rfmac = (c == '\0' && q - rfmac == ETH_ALEN);
+
+	return 0;
+}
+
+early_param("rfmac", rfmac_param);
+
+/*
+ * Generate an Ethernet MAC address that has a good chance of being unique.
+ * @addr:	Pointer to six-byte array containing the Ethernet address
+ * Generates an Ethernet MAC address that is highly likely to be unique for
+ * this particular system on a network with other systems of the same type.
+ *
+ * The problem we are solving is that, when random_ether_addr() is used to
+ * generate MAC addresses at startup, there isn't much entropy for the random
+ * number generator to use and the addresses it produces are fairly likely to
+ * be the same as those of other identical systems on the same local network.
+ * This is true even for relatively small numbers of systems (for the reason
+ * why, see the Wikipedia entry for "Birthday problem" at:
+ *	http://en.wikipedia.org/wiki/Birthday_problem
+ *
+ * The good news is that we already have a MAC address known to be unique, the
+ * RF MAC address. The bad news is that this address is already in use on the
+ * RF interface. Worse, the obvious trick, taking the RF MAC address and
+ * turning on the locally managed bit, has already been used for other devices.
+ * Still, this does give us something to work with.
+ *
+ * The approach we take is:
+ * 1.	If we can't get the RF MAC Address, just call random_ether_addr.
+ * 2.	Use the 24-bit NIC-specific bits of the RF MAC address as the last 24
+ *	bits of the new address. This is very likely to be unique, except for
+ *	the current box.
+ * 3.	To avoid using addresses already on the current box, we set the top
+ *	six bits of the address with a value different from any currently
+ *	registered Scientific Atlanta organizationally unique identifyer
+ *	(OUI). This avoids duplication with any addresses on the system that
+ *	were generated from valid Scientific Atlanta-registered address by
+ *	simply flipping the locally managed bit.
+ * 4.	We aren't generating a multicast address, so we leave the multicast
+ *	bit off. Since we aren't using a registered address, we have to set
+ *	the locally managed bit.
+ * 5.	We then randomly generate the remaining 16-bits. This does two
+ *	things:
+ *	a.	It allows us to call this function for more than one device
+ *		in this system
+ *	b.	It ensures that things will probably still work even if
+ *		some device on the device network has a locally managed
+ *		address that matches the top six bits from step 2.
+ */
+void platform_random_ether_addr(u8 addr[ETH_ALEN])
+{
+	const int num_random_bytes = 2;
+	const unsigned char non_sciatl_oui_bits = 0xc0u;
+	const unsigned char mac_addr_locally_managed = (1 << 1);
+
+	if (!have_rfmac) {
+		pr_warning("rfmac not available on command line; "
+			"generating random MAC address\n");
+		random_ether_addr(addr);
+	}
+
+	else {
+		int	i;
+
+		/* Set the first byte to something that won't match a Scientific
+		 * Atlanta OUI, is locally managed, and isn't a multicast
+		 * address */
+		addr[0] = non_sciatl_oui_bits | mac_addr_locally_managed;
+
+		/* Get some bytes of random address information */
+		get_random_bytes(&addr[1], num_random_bytes);
+
+		/* Copy over the NIC-specific bits of the RF MAC address */
+		for (i = 1 + num_random_bytes; i < ETH_ALEN; i++)
+			addr[i] = rfmac[i];
+	}
+}
-- 
cgit