[mcs814x] more convertions to {read,write}_relaxed I/O accessors
[openwrt.git] / target / linux / mcs814x / files-3.3 / arch / arm / mach-mcs814x / common.c
1 /*
2  * arch/arm/mach-mcs814x/common.c
3  *
4  * Core functions for Moschip MCS814x SoCs
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2.  This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/io.h>
14 #include <linux/gpio.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17
18 #include <asm/setup.h>
19 #include <asm/mach-types.h>
20 #include <asm/mach/arch.h>
21 #include <mach/mcs814x.h>
22 #include <mach/cpu.h>
23 #include <asm/pgtable.h>
24 #include <asm/mach/map.h>
25
26 void __iomem *mcs814x_sysdbg_base;
27
28 static struct map_desc mcs814x_io_desc[] __initdata = {
29         {
30                 .virtual        = MCS814X_IO_BASE,
31                 .pfn            = __phys_to_pfn(MCS814X_IO_START),
32                 .length         = MCS814X_IO_SIZE,
33                 .type           = MT_DEVICE
34         },
35 };
36
37 struct cpu_mode {
38         const char *name;
39         int gpio_start;
40         int gpio_end;
41 };
42
43 static const struct cpu_mode cpu_modes[] = {
44         {
45                 .name           = "I2S",
46                 .gpio_start     = 4,
47                 .gpio_end       = 8,
48         },
49         {
50                 .name           = "UART",
51                 .gpio_start     = 4,
52                 .gpio_end       = 9,
53         },
54         {
55                 .name           = "External MII",
56                 .gpio_start     = 0,
57                 .gpio_end       = 16,
58         },
59         {
60                 .name           = "Normal",
61                 .gpio_start     = -1,
62                 .gpio_end       = -1,
63         },
64 };
65
66 static void mcs814x_eth_hardware_filter_set(u8 value)
67 {
68         u32 reg;
69
70         reg = readl_relaxed(MCS814X_VIRT_BASE + MCS814X_DBGLED);
71         if (value)
72                 reg |= 0x80;
73         else
74                 reg &= ~0x80;
75         writel_relaxed(reg, MCS814X_VIRT_BASE + MCS814X_DBGLED);
76 }
77
78 static void mcs814x_eth_led_cfg_set(u8 cfg)
79 {
80         u32 reg;
81
82         reg = readl_relaxed(mcs814x_sysdbg_base + SYSDBG_BS2);
83         reg &= ~LED_CFG_MASK;
84         reg |= cfg;
85         writel_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_BS2);
86 }
87
88 static void mcs814x_eth_buffer_shifting_set(u8 value)
89 {
90         u8 reg;
91
92         reg = readb_relaxed(mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
93         if (value)
94                 reg |= BUF_SHIFT_BIT;
95         else
96                 reg &= ~BUF_SHIFT_BIT;
97         writeb_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
98 }
99
100 static struct of_device_id mcs814x_eth_ids[] __initdata = {
101         { .compatible = "moschip,nuport-mac", },
102         { /* sentinel */ },
103 };
104
105 /* Configure platform specific knobs based on ethernet device node
106  * properties */
107 static void mcs814x_eth_init(void)
108 {
109         struct device_node *np;
110         const unsigned int *intspec;
111
112         np = of_find_matching_node(NULL, mcs814x_eth_ids);
113         if (!np)
114                 return;
115
116         /* hardware filter must always be enabled */
117         mcs814x_eth_hardware_filter_set(1);
118
119         intspec = of_get_property(np, "nuport-mac,buffer-shifting", NULL);
120         if (!intspec)
121                 mcs814x_eth_buffer_shifting_set(0);
122         else
123                 mcs814x_eth_buffer_shifting_set(1);
124
125         intspec = of_get_property(np, "nuport-mac,link-activity", NULL);
126         if (intspec)
127                 mcs814x_eth_led_cfg_set(be32_to_cpup(intspec));
128
129         of_node_put(np);
130 }
131
132 void __init mcs814x_init_machine(void)
133 {
134         u32 bs2, cpu_mode;
135         int gpio;
136
137         bs2 = readl_relaxed(mcs814x_sysdbg_base + SYSDBG_BS2);
138         cpu_mode = (bs2 >> CPU_MODE_SHIFT) & CPU_MODE_MASK;
139
140         pr_info("CPU mode: %s\n", cpu_modes[cpu_mode].name);
141
142         /* request the gpios since the pins are muxed for functionnality */
143         for (gpio = cpu_modes[cpu_mode].gpio_start;
144                 gpio == cpu_modes[cpu_mode].gpio_end; gpio++) {
145                 if (gpio != -1)
146                         gpio_request(gpio, cpu_modes[cpu_mode].name);
147         }
148
149         mcs814x_eth_init();
150 }
151
152 void __init mcs814x_map_io(void)
153 {
154         iotable_init(mcs814x_io_desc, ARRAY_SIZE(mcs814x_io_desc));
155
156         mcs814x_sysdbg_base = ioremap(MCS814X_IO_START + MCS814X_SYSDBG,
157                                         MCS814X_SYSDBG_SIZE);
158         if (!mcs814x_sysdbg_base)
159                 panic("unable to remap sysdbg base");
160 }
161
162 void mcs814x_restart(char mode, const char *cmd)
163 {
164         writel_relaxed(~(1 << 31), mcs814x_sysdbg_base);
165 }