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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/powerpc/boot/treeboot-walnut.c
2 * Old U-boot compatibility for Walnut
4 * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
6 * Copyright 2007 IBM Corporation
7 * Based on cuboot-83xx.c, which is:
8 * Copyright (c) 2007 Freescale Semiconductor, Inc.
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
23 void ibm405gp_fixup_clocks(unsigned int sysclk
, unsigned int ser_clk
)
25 u32 pllmr
= mfdcr(DCRN_CPC0_PLLMR
);
26 u32 cpc0_cr0
= mfdcr(DCRN_405_CPC0_CR0
);
27 u32 cpc0_cr1
= mfdcr(DCRN_405_CPC0_CR1
);
28 u32 cpu
, plb
, opb
, ebc
, tb
, uart0
, uart1
, m
;
29 u32 fwdv
, fbdv
, cbdv
, opdv
, epdv
, udiv
;
31 fwdv
= (8 - ((pllmr
& 0xe0000000) >> 29));
32 fbdv
= (pllmr
& 0x1e000000) >> 25;
33 cbdv
= ((pllmr
& 0x00060000) >> 17) + 1;
34 opdv
= ((pllmr
& 0x00018000) >> 15) + 1;
35 epdv
= ((pllmr
& 0x00001800) >> 13) + 2;
36 udiv
= ((cpc0_cr0
& 0x3e) >> 1) + 1;
38 m
= fwdv
* fbdv
* cbdv
;
40 cpu
= sysclk
* m
/ fwdv
;
45 if (cpc0_cr0
& 0x80) {
46 /* uart0 uses the external clock */
52 if (cpc0_cr0
& 0x40) {
53 /* uart1 uses the external clock */
59 /* setup the timebase clock to tick at the cpu frequency */
60 cpc0_cr1
= cpc0_cr1
& ~0x00800000;
61 mtdcr(DCRN_405_CPC0_CR1
, cpc0_cr1
);
64 dt_fixup_cpu_clocks(cpu
, tb
, 0);
65 dt_fixup_clock("/plb", plb
);
66 dt_fixup_clock("/plb/opb", opb
);
67 dt_fixup_clock("/plb/ebc", ebc
);
68 dt_fixup_clock("/plb/opb/serial@ef600300", uart0
);
69 dt_fixup_clock("/plb/opb/serial@ef600400", uart1
);
72 static void walnut_flashsel_fixup(void)
75 u32 reg_flash
[3] = {0x0, 0x0, 0x80000};
76 u32 reg_sram
[3] = {0x0, 0x0, 0x80000};
80 devp
= finddevice("/plb/ebc/fpga");
82 fatal("Couldn't locate FPGA node\n\r");
84 if (getprop(devp
, "virtual-reg", &fpga
, sizeof(fpga
)) != sizeof(fpga
))
85 fatal("no virtual-reg property\n\r");
87 fpga_brds1
= in_8(fpga
);
89 devp
= finddevice("/plb/ebc/flash");
91 fatal("Couldn't locate flash node\n\r");
93 if (getprop(devp
, "reg", reg_flash
, sizeof(reg_flash
)) != sizeof(reg_flash
))
94 fatal("flash reg property has unexpected size\n\r");
96 sram
= finddevice("/plb/ebc/sram");
98 fatal("Couldn't locate sram node\n\r");
100 if (getprop(sram
, "reg", reg_sram
, sizeof(reg_sram
)) != sizeof(reg_sram
))
101 fatal("sram reg property has unexpected size\n\r");
103 if (fpga_brds1
& 0x1) {
104 reg_flash
[1] ^= 0x80000;
105 reg_sram
[1] ^= 0x80000;
108 setprop(devp
, "reg", reg_flash
, sizeof(reg_flash
));
109 setprop(sram
, "reg", reg_sram
, sizeof(reg_sram
));
112 #define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
113 static void walnut_fixups(void)
115 ibm4xx_fixup_memsize();
116 ibm405gp_fixup_clocks(33330000, 0xa8c000);
117 ibm4xx_quiesce_eth((u32
*)0xef600800, NULL
);
118 ibm4xx_fixup_ebc_ranges("/plb/ebc");
119 walnut_flashsel_fixup();
120 dt_fixup_mac_addresses((u8
*) WALNUT_OPENBIOS_MAC_OFF
);
123 void platform_init(void)
125 unsigned long end_of_ram
= 0x2000000;
126 unsigned long avail_ram
= end_of_ram
- (unsigned long) _end
;
128 simple_alloc_init(_end
, avail_ram
, 32, 32);
129 platform_ops
.fixups
= walnut_fixups
;
130 platform_ops
.exit
= ibm40x_dbcr_reset
;
131 ft_init(_dtb_start
, _dtb_end
- _dtb_start
, 32);
132 serial_console_init();