mpc85xx boards: initdram() cleanup/bugfix
[platform/kernel/u-boot.git] / board / freescale / mpc8540ads / mpc8540ads.c
1 /*
2  * Copyright 2004 Freescale Semiconductor.
3  * (C) Copyright 2002,2003, Motorola Inc.
4  * Xianghua Xiao, (X.Xiao@motorola.com)
5  *
6  * (C) Copyright 2002 Scott McNutt <smcnutt@artesyncp.com>
7  *
8  * See file CREDITS for list of people who contributed to this
9  * project.
10  *
11  * This program is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU General Public License as
13  * published by the Free Software Foundation; either version 2 of
14  * the License, or (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24  * MA 02111-1307 USA
25  */
26
27
28 #include <common.h>
29 #include <pci.h>
30 #include <asm/processor.h>
31 #include <asm/mmu.h>
32 #include <asm/immap_85xx.h>
33 #include <asm/fsl_ddr_sdram.h>
34 #include <libfdt.h>
35 #include <fdt_support.h>
36
37 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
38 extern void ddr_enable_ecc(unsigned int dram_size);
39 #endif
40
41 void local_bus_init(void);
42
43 int checkboard (void)
44 {
45         puts("Board: ADS\n");
46
47 #ifdef CONFIG_PCI
48         printf("PCI1: 32 bit, %d MHz (compiled)\n",
49                CONFIG_SYS_CLK_FREQ / 1000000);
50 #else
51         printf("PCI1: disabled\n");
52 #endif
53
54         /*
55          * Initialize local bus.
56          */
57         local_bus_init();
58
59         return 0;
60 }
61
62 /*
63  * Initialize Local Bus
64  */
65
66 void
67 local_bus_init(void)
68 {
69         volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
70         volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
71
72         uint clkdiv;
73         uint lbc_hz;
74         sys_info_t sysinfo;
75
76         /*
77          * Errata LBC11.
78          * Fix Local Bus clock glitch when DLL is enabled.
79          *
80          * If localbus freq is < 66MHz, DLL bypass mode must be used.
81          * If localbus freq is > 133MHz, DLL can be safely enabled.
82          * Between 66 and 133, the DLL is enabled with an override workaround.
83          */
84
85         get_sys_info(&sysinfo);
86         clkdiv = lbc->lcrr & LCRR_CLKDIV;
87         lbc_hz = sysinfo.freqSystemBus / 1000000 / clkdiv;
88
89         if (lbc_hz < 66) {
90                 lbc->lcrr = CONFIG_SYS_LBC_LCRR | 0x80000000;   /* DLL Bypass */
91
92         } else if (lbc_hz >= 133) {
93                 lbc->lcrr = CONFIG_SYS_LBC_LCRR & (~0x80000000); /* DLL Enabled */
94
95         } else {
96                 /*
97                  * On REV1 boards, need to change CLKDIV before enable DLL.
98                  * Default CLKDIV is 8, change it to 4 temporarily.
99                  */
100                 uint pvr = get_pvr();
101                 uint temp_lbcdll = 0;
102
103                 if (pvr == PVR_85xx_REV1) {
104                         /* FIXME: Justify the high bit here. */
105                         lbc->lcrr = 0x10000004;
106                 }
107
108                 lbc->lcrr = CONFIG_SYS_LBC_LCRR & (~0x80000000); /* DLL Enabled */
109                 udelay(200);
110
111                 /*
112                  * Sample LBC DLL ctrl reg, upshift it to set the
113                  * override bits.
114                  */
115                 temp_lbcdll = gur->lbcdllcr;
116                 gur->lbcdllcr = (((temp_lbcdll & 0xff) << 16) | 0x80000000);
117                 asm("sync;isync;msync");
118         }
119 }
120
121
122 /*
123  * Initialize SDRAM memory on the Local Bus.
124  */
125
126 void
127 sdram_init(void)
128 {
129         volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
130         uint *sdram_addr = (uint *)CONFIG_SYS_LBC_SDRAM_BASE;
131
132         puts("    SDRAM: ");
133         print_size (CONFIG_SYS_LBC_SDRAM_SIZE * 1024 * 1024, "\n");
134
135         /*
136          * Setup SDRAM Base and Option Registers
137          */
138         set_lbc_or(2, CONFIG_SYS_OR2_PRELIM);
139         set_lbc_br(2, CONFIG_SYS_BR2_PRELIM);
140         lbc->lbcr = CONFIG_SYS_LBC_LBCR;
141         asm("msync");
142
143         lbc->lsrt = CONFIG_SYS_LBC_LSRT;
144         lbc->mrtpr = CONFIG_SYS_LBC_MRTPR;
145         asm("sync");
146
147         /*
148          * Configure the SDRAM controller.
149          */
150         lbc->lsdmr = CONFIG_SYS_LBC_LSDMR_1;
151         asm("sync");
152         *sdram_addr = 0xff;
153         ppcDcbf((unsigned long) sdram_addr);
154         udelay(100);
155
156         lbc->lsdmr = CONFIG_SYS_LBC_LSDMR_2;
157         asm("sync");
158         *sdram_addr = 0xff;
159         ppcDcbf((unsigned long) sdram_addr);
160         udelay(100);
161
162         lbc->lsdmr = CONFIG_SYS_LBC_LSDMR_3;
163         asm("sync");
164         *sdram_addr = 0xff;
165         ppcDcbf((unsigned long) sdram_addr);
166         udelay(100);
167
168         lbc->lsdmr = CONFIG_SYS_LBC_LSDMR_4;
169         asm("sync");
170         *sdram_addr = 0xff;
171         ppcDcbf((unsigned long) sdram_addr);
172         udelay(100);
173
174         lbc->lsdmr = CONFIG_SYS_LBC_LSDMR_5;
175         asm("sync");
176         *sdram_addr = 0xff;
177         ppcDcbf((unsigned long) sdram_addr);
178         udelay(100);
179 }
180
181 #if !defined(CONFIG_SPD_EEPROM)
182 /*************************************************************************
183  *  fixed sdram init -- doesn't use serial presence detect.
184  ************************************************************************/
185 phys_size_t fixed_sdram(void)
186 {
187   #ifndef CONFIG_SYS_RAMBOOT
188         volatile ccsr_ddr_t *ddr= (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR);
189
190         ddr->cs0_bnds = CONFIG_SYS_DDR_CS0_BNDS;
191         ddr->cs0_config = CONFIG_SYS_DDR_CS0_CONFIG;
192         ddr->timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1;
193         ddr->timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2;
194         ddr->sdram_mode = CONFIG_SYS_DDR_MODE;
195         ddr->sdram_interval = CONFIG_SYS_DDR_INTERVAL;
196     #if defined (CONFIG_DDR_ECC)
197         ddr->err_disable = 0x0000000D;
198         ddr->err_sbe = 0x00ff0000;
199     #endif
200         asm("sync;isync;msync");
201         udelay(500);
202     #if defined (CONFIG_DDR_ECC)
203         /* Enable ECC checking */
204         ddr->sdram_cfg = (CONFIG_SYS_DDR_CONTROL | 0x20000000);
205     #else
206         ddr->sdram_cfg = CONFIG_SYS_DDR_CONTROL;
207     #endif
208         asm("sync; isync; msync");
209         udelay(500);
210   #endif
211         return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
212 }
213 #endif  /* !defined(CONFIG_SPD_EEPROM) */
214
215
216 #if defined(CONFIG_PCI)
217 /*
218  * Initialize PCI Devices, report devices found.
219  */
220
221
222 static struct pci_controller hose;
223
224 #endif  /* CONFIG_PCI */
225
226
227 void
228 pci_init_board(void)
229 {
230 #ifdef CONFIG_PCI
231         pci_mpc85xx_init(&hose);
232 #endif /* CONFIG_PCI */
233 }
234
235
236 #if defined(CONFIG_OF_BOARD_SETUP)
237 void
238 ft_board_setup(void *blob, bd_t *bd)
239 {
240         int node, tmp[2];
241         const char *path;
242
243         ft_cpu_setup(blob, bd);
244
245         node = fdt_path_offset(blob, "/aliases");
246         tmp[0] = 0;
247         if (node >= 0) {
248 #ifdef CONFIG_PCI
249                 path = fdt_getprop(blob, node, "pci0", NULL);
250                 if (path) {
251                         tmp[1] = hose.last_busno - hose.first_busno;
252                         do_fixup_by_path(blob, path, "bus-range", &tmp, 8, 1);
253                 }
254 #endif
255         }
256 }
257 #endif