2 * arch/arm/mach-mcs814x/common.c
4 * Core functions for Moschip MCS814x SoCs
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.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
14 #include <linux/gpio.h>
16 #include <linux/of_address.h>
18 #include <asm/setup.h>
19 #include <asm/mach-types.h>
20 #include <asm/mach/arch.h>
21 #include <mach/mcs814x.h>
23 #include <asm/pgtable.h>
24 #include <asm/mach/map.h>
26 void __iomem *mcs814x_sysdbg_base;
28 static struct map_desc mcs814x_io_desc[] __initdata = {
30 .virtual = MCS814X_IO_BASE,
31 .pfn = __phys_to_pfn(MCS814X_IO_START),
32 .length = MCS814X_IO_SIZE,
43 static const struct cpu_mode cpu_modes[] = {
55 .name = "External MII",
66 static void mcs814x_eth_hardware_filter_set(u8 value)
70 reg = readl_relaxed(MCS814X_VIRT_BASE + MCS814X_DBGLED);
75 writel_relaxed(reg, MCS814X_VIRT_BASE + MCS814X_DBGLED);
78 static void mcs814x_eth_led_cfg_set(u8 cfg)
82 reg = readl_relaxed(mcs814x_sysdbg_base + SYSDBG_BS2);
85 writel_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_BS2);
88 static void mcs814x_eth_buffer_shifting_set(u8 value)
92 reg = readb_relaxed(mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
96 reg &= ~BUF_SHIFT_BIT;
97 writeb_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
100 static struct of_device_id mcs814x_eth_ids[] __initdata = {
101 { .compatible = "moschip,nuport-mac", },
105 /* Configure platform specific knobs based on ethernet device node
107 static void mcs814x_eth_init(void)
109 struct device_node *np;
110 const unsigned int *intspec;
112 np = of_find_matching_node(NULL, mcs814x_eth_ids);
116 /* hardware filter must always be enabled */
117 mcs814x_eth_hardware_filter_set(1);
119 intspec = of_get_property(np, "nuport-mac,buffer-shifting", NULL);
121 mcs814x_eth_buffer_shifting_set(0);
123 mcs814x_eth_buffer_shifting_set(1);
125 intspec = of_get_property(np, "nuport-mac,link-activity", NULL);
127 mcs814x_eth_led_cfg_set(be32_to_cpup(intspec));
132 void __init mcs814x_init_machine(void)
137 bs2 = readl_relaxed(mcs814x_sysdbg_base + SYSDBG_BS2);
138 cpu_mode = (bs2 >> CPU_MODE_SHIFT) & CPU_MODE_MASK;
140 pr_info("CPU mode: %s\n", cpu_modes[cpu_mode].name);
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++) {
146 gpio_request(gpio, cpu_modes[cpu_mode].name);
152 void __init mcs814x_map_io(void)
154 iotable_init(mcs814x_io_desc, ARRAY_SIZE(mcs814x_io_desc));
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");
162 void mcs814x_restart(char mode, const char *cmd)
164 writel_relaxed(~(1 << 31), mcs814x_sysdbg_base);