1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * QNAP TS-x09 Boards common functions
4 *
5 * Maintainers: Lennert Buytenhek <buytenh@marvell.com>
6 *		Byron Bradley <byron.bbradley@gmail.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/pci.h>
11#include <linux/mv643xx_eth.h>
12#include <linux/timex.h>
13#include <linux/serial_reg.h>
14#include "orion5x.h"
15#include "tsx09-common.h"
16#include "common.h"
17
18/*****************************************************************************
19 * QNAP TS-x09 specific power off method via UART1-attached PIC
20 ****************************************************************************/
21
22#define UART1_REG(x)	(UART1_VIRT_BASE + ((UART_##x) << 2))
23
24void qnap_tsx09_power_off(void)
25{
26	/* 19200 baud divisor */
27	const unsigned divisor = ((orion5x_tclk + (8 * 19200)) / (16 * 19200));
28
29	pr_info("%s: triggering power-off...\n", __func__);
30
31	/* hijack uart1 and reset into sane state (19200,8n1) */
32	writel(0x83, UART1_REG(LCR));
33	writel(divisor & 0xff, UART1_REG(DLL));
34	writel((divisor >> 8) & 0xff, UART1_REG(DLM));
35	writel(0x03, UART1_REG(LCR));
36	writel(0x00, UART1_REG(IER));
37	writel(0x00, UART1_REG(FCR));
38	writel(0x00, UART1_REG(MCR));
39
40	/* send the power-off command 'A' to PIC */
41	writel('A', UART1_REG(TX));
42}
43
44/*****************************************************************************
45 * Ethernet
46 ****************************************************************************/
47
48struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
49	.phy_addr	= MV643XX_ETH_PHY_ADDR(8),
50};
51
52static int __init qnap_tsx09_parse_hex_nibble(char n)
53{
54	if (n >= '0' && n <= '9')
55		return n - '0';
56
57	if (n >= 'A' && n <= 'F')
58		return n - 'A' + 10;
59
60	if (n >= 'a' && n <= 'f')
61		return n - 'a' + 10;
62
63	return -1;
64}
65
66static int __init qnap_tsx09_parse_hex_byte(const char *b)
67{
68	int hi;
69	int lo;
70
71	hi = qnap_tsx09_parse_hex_nibble(b[0]);
72	lo = qnap_tsx09_parse_hex_nibble(b[1]);
73
74	if (hi < 0 || lo < 0)
75		return -1;
76
77	return (hi << 4) | lo;
78}
79
80static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
81{
82	u_int8_t addr[6];
83	int i;
84
85	for (i = 0; i < 6; i++) {
86		int byte;
87
88		/*
89		 * Enforce "xx:xx:xx:xx:xx:xx\n" format.
90		 */
91		if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
92			return -1;
93
94		byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
95		if (byte < 0)
96			return -1;
97		addr[i] = byte;
98	}
99
100	printk(KERN_INFO "tsx09: found ethernet mac address %pM\n", addr);
101
102	memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);
103
104	return 0;
105}
106
107/*
108 * The 'NAS Config' flash partition has an ext2 filesystem which
109 * contains a file that has the ethernet MAC address in plain text
110 * (format "xx:xx:xx:xx:xx:xx\n").
111 */
112void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
113{
114	unsigned long addr;
115
116	for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
117		char *nor_page;
118		int ret = 0;
119
120		nor_page = ioremap(addr, 1024);
121		if (nor_page != NULL) {
122			ret = qnap_tsx09_check_mac_addr(nor_page);
123			iounmap(nor_page);
124		}
125
126		if (ret == 0)
127			break;
128	}
129}
130