tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
C6X: general SoC support
This patch provides a soc_ops struct which provides hooks for SoC functionality
which doesn't fit well into other places.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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arch/c6x/include/asm/soc.h
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arch/c6x/include/asm/soc.h
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/*
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* Miscellaneous SoC-specific hooks.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated
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*
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* Author: Mark Salter <msalter@redhat.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#ifndef _ASM_C6X_SOC_H
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#define _ASM_C6X_SOC_H
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struct soc_ops {
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/* Return active exception event or -1 if none */
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int (*get_exception)(void);
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/* Assert an event */
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void (*assert_event)(unsigned int evt);
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};
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extern struct soc_ops soc_ops;
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extern int soc_get_exception(void);
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extern void soc_assert_event(unsigned int event);
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extern int soc_mac_addr(unsigned int index, u8 *addr);
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/*
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* for mmio on SoC devices. regs are always same byte order as cpu.
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*/
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#define soc_readl(addr) __raw_readl(addr)
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#define soc_writel(b, addr) __raw_writel((b), (addr))
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#endif /* _ASM_C6X_SOC_H */
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arch/c6x/kernel/soc.c
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arch/c6x/kernel/soc.c
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/*
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* Miscellaneous SoC-specific hooks.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated
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* Author: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/etherdevice.h>
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#include <asm/system.h>
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#include <asm/setup.h>
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#include <asm/soc.h>
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struct soc_ops soc_ops;
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int soc_get_exception(void)
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{
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if (!soc_ops.get_exception)
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return -1;
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return soc_ops.get_exception();
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}
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void soc_assert_event(unsigned int evt)
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{
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if (soc_ops.assert_event)
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soc_ops.assert_event(evt);
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}
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static u8 cmdline_mac[6];
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static int __init get_mac_addr_from_cmdline(char *str)
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{
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int count, i, val;
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for (count = 0; count < 6 && *str; count++, str += 3) {
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if (!isxdigit(str[0]) || !isxdigit(str[1]))
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return 0;
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if (str[2] != ((count < 5) ? ':' : '\0'))
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return 0;
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for (i = 0, val = 0; i < 2; i++) {
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val = val << 4;
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val |= isdigit(str[i]) ?
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str[i] - '0' : toupper(str[i]) - 'A' + 10;
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}
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cmdline_mac[count] = val;
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}
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return 1;
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}
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__setup("emac_addr=", get_mac_addr_from_cmdline);
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/*
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* Setup the MAC address for SoC ethernet devices.
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*
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* Before calling this function, the ethernet driver will have
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* initialized the addr with local-mac-address from the device
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* tree (if found). Allow command line to override, but not
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* the fused address.
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*/
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int soc_mac_addr(unsigned int index, u8 *addr)
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{
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int i, have_dt_mac = 0, have_cmdline_mac = 0, have_fuse_mac = 0;
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for (i = 0; i < 6; i++) {
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if (cmdline_mac[i])
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have_cmdline_mac = 1;
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if (c6x_fuse_mac[i])
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have_fuse_mac = 1;
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if (addr[i])
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have_dt_mac = 1;
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}
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/* cmdline overrides all */
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if (have_cmdline_mac)
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memcpy(addr, cmdline_mac, 6);
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else if (!have_dt_mac) {
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if (have_fuse_mac)
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memcpy(addr, c6x_fuse_mac, 6);
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else
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random_ether_addr(addr);
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}
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/* adjust for specific EMAC device */
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addr[5] += index * c6x_num_cores;
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return 1;
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}
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EXPORT_SYMBOL_GPL(soc_mac_addr);