2 * Atheros AR71xx SoC specific setup
4 * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Parts of this file are based on Atheros' 2.6.15 BSP
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <linux/pci.h>
19 #include <linux/serial_8250.h>
20 #include <linux/bootmem.h>
22 #include <asm/bootinfo.h>
23 #include <asm/traps.h>
24 #include <asm/time.h> /* for mips_hpt_frequency */
25 #include <asm/reboot.h> /* for _machine_{restart,halt} */
27 #include <asm/mach-ar71xx/ar71xx.h>
28 #include <asm/mach-ar71xx/pci.h>
29 #include <asm/mach-ar71xx/platform.h>
31 #define AR71XX_SYS_TYPE_LEN 64
32 #define AR71XX_BASE_FREQ 40000000
34 #define AR71XX_MEM_SIZE_MIN 0x0200000
35 #define AR71XX_MEM_SIZE_MAX 0x8000000
38 EXPORT_SYMBOL_GPL(ar71xx_cpu_freq
);
41 EXPORT_SYMBOL_GPL(ar71xx_ahb_freq
);
44 EXPORT_SYMBOL_GPL(ar71xx_ddr_freq
);
46 int (*ar71xx_pci_bios_init
)(unsigned nr_irqs
,
47 struct ar71xx_pci_irq
*map
) __initdata
;
49 int (*ar71xx_pci_be_handler
)(int is_fixup
);
51 static char ar71xx_sys_type
[AR71XX_SYS_TYPE_LEN
];
53 static void ar71xx_restart(char *command
)
55 ar71xx_device_stop(RESET_MODULE_FULL_CHIP
);
61 static void ar71xx_halt(void)
67 static int ar71xx_be_handler(struct pt_regs
*regs
, int is_fixup
)
71 if (ar71xx_pci_be_handler
)
72 err
= ar71xx_pci_be_handler(is_fixup
);
74 return (is_fixup
&& !err
) ? MIPS_BE_FIXUP
: MIPS_BE_FATAL
;
77 int __init
ar71xx_pci_init(unsigned nr_irqs
, struct ar71xx_pci_irq
*map
)
79 if (!ar71xx_pci_bios_init
)
82 return ar71xx_pci_bios_init(nr_irqs
, map
);
85 static void __init
ar71xx_detect_mem_size(void)
91 p
= (volatile u8
*) KSEG1ADDR(0);
93 for (size
= AR71XX_MEM_SIZE_MIN
;
94 size
<= (AR71XX_MEM_SIZE_MAX
>> 1); size
<<= 1) {
100 /* Mirrored data found, try another pattern */
103 /* Mirrored data found again, stop detection */
110 add_memory_region(0, size
, BOOT_MEM_RAM
);
113 static void __init
ar71xx_detect_sys_type(void)
119 id
= ar71xx_reset_rr(RESET_REG_REV_ID
) & REV_ID_MASK
;
120 rev
= (id
>> REV_ID_REVISION_SHIFT
) & REV_ID_REVISION_MASK
;
121 switch (id
& REV_ID_CHIP_MASK
) {
122 case REV_ID_CHIP_AR7130
:
125 case REV_ID_CHIP_AR7141
:
128 case REV_ID_CHIP_AR7161
:
135 sprintf(ar71xx_sys_type
, "Atheros AR%s rev %u (id:0x%02x)",
139 static void __init
ar71xx_detect_sys_frequency(void)
145 pll
= ar71xx_pll_rr(PLL_REG_CPU_PLL_CFG
);
147 div
= ((pll
>> PLL_DIV_SHIFT
) & PLL_DIV_MASK
) + 1;
148 freq
= div
* AR71XX_BASE_FREQ
;
150 div
= ((pll
>> CPU_DIV_SHIFT
) & CPU_DIV_MASK
) + 1;
151 ar71xx_cpu_freq
= freq
/ div
;
153 div
= ((pll
>> DDR_DIV_SHIFT
) & DDR_DIV_MASK
) + 1;
154 ar71xx_ddr_freq
= freq
/ div
;
156 div
= (((pll
>> AHB_DIV_SHIFT
) & AHB_DIV_MASK
) + 1) * 2;
157 ar71xx_ahb_freq
= ar71xx_cpu_freq
/ div
;
160 #ifdef CONFIG_AR71XX_EARLY_SERIAL
161 static void __init
ar71xx_early_serial_setup(void)
165 memset(&p
, 0, sizeof(p
));
167 p
.flags
= UPF_BOOT_AUTOCONF
| UPF_SKIP_TEST
| UPF_IOREMAP
;
168 p
.iotype
= UPIO_MEM32
;
169 p
.uartclk
= ar71xx_ahb_freq
;
170 p
.irq
= AR71XX_MISC_IRQ_UART
;
172 p
.mapbase
= AR71XX_UART_BASE
;
174 early_serial_setup(&p
);
177 static inline void ar71xx_early_serial_setup(void) {};
178 #endif /* CONFIG_AR71XX_EARLY_SERIAL */
180 const char *get_system_type(void)
182 return ar71xx_sys_type
;
185 unsigned int __cpuinit
get_c0_compare_irq(void)
187 return CP0_LEGACY_COMPARE_IRQ
;
190 void __init
plat_mem_setup(void)
192 set_io_port_base(KSEG1
);
194 ar71xx_ddr_base
= ioremap_nocache(AR71XX_DDR_CTRL_BASE
,
195 AR71XX_DDR_CTRL_SIZE
);
197 ar71xx_pll_base
= ioremap_nocache(AR71XX_PLL_BASE
,
200 ar71xx_reset_base
= ioremap_nocache(AR71XX_RESET_BASE
,
203 ar71xx_gpio_base
= ioremap_nocache(AR71XX_GPIO_BASE
, AR71XX_GPIO_SIZE
);
205 ar71xx_usb_ctrl_base
= ioremap_nocache(AR71XX_USB_CTRL_BASE
,
206 AR71XX_USB_CTRL_SIZE
);
208 ar71xx_detect_mem_size();
209 ar71xx_detect_sys_type();
210 ar71xx_detect_sys_frequency();
212 _machine_restart
= ar71xx_restart
;
213 _machine_halt
= ar71xx_halt
;
214 pm_power_off
= ar71xx_halt
;
216 board_be_handler
= ar71xx_be_handler
;
218 ar71xx_print_cmdline();
220 ar71xx_early_serial_setup();
223 void __init
plat_time_init(void)
225 mips_hpt_frequency
= ar71xx_cpu_freq
/ 2;