1 /* Initializes CPU and basic hardware such as memory
2 * controllers, IRQ controller and system timer 0.
5 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
34 DECLARE_GLOBAL_DATA_PTR;
36 /* reset CPU (jump to 0, without reset) */
39 /* find & initialize the memory controller */
40 int init_memory_ctrl(void);
42 ambapp_dev_irqmp *irqmp = NULL;
43 ambapp_dev_mctrl memctrl;
44 ambapp_dev_gptimer *gptimer = NULL;
45 unsigned int gptimer_irq = 0;
46 int leon3_snooping_avail = 0;
54 * Breath some life into the CPU...
56 * Set up the memory map,
57 * initialize a bunch of registers.
59 * Run from FLASH/PROM:
60 * - until memory controller is set up, only registers available
61 * - no global variables available for writing
62 * - constants available
67 /* these varaiable must not be initialized */
68 ambapp_dev_irqmp *irqmp;
70 register unsigned int apbmst;
72 /* find AMBA APB Master */
73 apbmst = (unsigned int)
74 ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_APBMST, 1, 0);
77 * no AHB/APB bridge, something is wrong
78 * ==> jump to start (or hang)
82 /* Init memory controller */
83 if (init_memory_ctrl()) {
87 /****************************************************
88 * From here we can use the main memory and the stack.
91 /* Find AMBA APB IRQMP Controller */
92 if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev) != 1) {
93 /* no IRQ controller, something is wrong
94 * ==> jump to start (or hang)
98 irqmp = (ambapp_dev_irqmp *) apbdev.address;
100 /* initialize the IRQMP */
101 irqmp->ilevel = 0xf; /* all IRQ off */
104 irqmp->iclear = 0xfffe; /* clear all old pending interrupts */
105 irqmp->cpu_mask[0] = 0; /* mask all IRQs on CPU 0 */
106 irqmp->cpu_force[0] = 0; /* no force IRQ on CPU 0 */
111 void cpu_init_f2(void)
117 * initialize higher level parts of CPU like time base and timers
121 ambapp_apbdev apbdev;
124 * Find AMBA APB IRQMP Controller,
125 * When we come so far we know there is a IRQMP available
127 ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev);
128 irqmp = (ambapp_dev_irqmp *) apbdev.address;
131 if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_GPTIMER, &apbdev) != 1) {
132 printf("cpu_init_r: gptimer not found!\n");
135 gptimer = (ambapp_dev_gptimer *) apbdev.address;
136 gptimer_irq = apbdev.irq;
138 /* initialize prescaler common to all timers to 1MHz */
139 gptimer->scalar = gptimer->scalar_reload =
140 (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
145 /* find & setup memory controller */
146 int init_memory_ctrl()
148 register ambapp_dev_mctrl *mctrl;
149 register ambapp_dev_sdctrl *sdctrl;
150 register ambapp_dev_ddrspa *ddrspa;
151 register ambapp_dev_ddr2spa *ddr2spa;
152 register ahbctrl_pp_dev *ahb;
153 register unsigned int base;
154 register int not_found_mctrl = -1;
156 /* find ESA Memory controller */
157 base = ambapp_apb_next_nomem(VENDOR_ESA, ESA_MCTRL, 0);
159 mctrl = (ambapp_dev_mctrl *) base;
161 /* config MCTRL memory controller */
162 mctrl->mcfg1 = CONFIG_SYS_GRLIB_MEMCFG1 | (mctrl->mcfg1 & 0x300);
163 mctrl->mcfg2 = CONFIG_SYS_GRLIB_MEMCFG2;
164 mctrl->mcfg3 = CONFIG_SYS_GRLIB_MEMCFG3;
168 /* find Gaisler Fault Tolerant Memory controller */
169 base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_FTMCTRL, 0);
171 mctrl = (ambapp_dev_mctrl *) base;
173 /* config MCTRL memory controller */
174 mctrl->mcfg1 = CONFIG_SYS_GRLIB_FT_MEMCFG1 | (mctrl->mcfg1 & 0x300);
175 mctrl->mcfg2 = CONFIG_SYS_GRLIB_FT_MEMCFG2;
176 mctrl->mcfg3 = CONFIG_SYS_GRLIB_FT_MEMCFG3;
180 /* find SDRAM controller */
181 base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_SDCTRL, 0);
183 sdctrl = (ambapp_dev_sdctrl *) base;
185 /* config memory controller */
186 sdctrl->sdcfg = CONFIG_SYS_GRLIB_SDRAM;
190 ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDR2SPA, 1, 0);
192 ddr2spa = (ambapp_dev_ddr2spa *) ambapp_ahb_get_info(ahb, 1);
194 /* Config DDR2 memory controller */
195 ddr2spa->cfg1 = CONFIG_SYS_GRLIB_DDR2_CFG1;
196 ddr2spa->cfg3 = CONFIG_SYS_GRLIB_DDR2_CFG3;
200 ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDRSPA, 1, 0);
202 ddrspa = (ambapp_dev_ddrspa *) ambapp_ahb_get_info(ahb, 1);
204 /* Config DDR memory controller */
205 ddrspa->ctrl = CONFIG_SYS_GRLIB_DDR_CFG;
209 /* failed to find any memory controller */
210 return not_found_mctrl;
213 /* Uses Timer 0 to get accurate
214 * pauses. Max 2 raised to 32 ticks
217 void cpu_wait_ticks(unsigned long ticks)
219 unsigned long start = get_timer(0);
220 while (get_timer(start) < ticks) ;
223 /* initiate and setup timer0 interrupt to 1MHz
224 * Return irq number for timer int or a negative number for
227 int timer_interrupt_init_cpu(void)
230 gptimer->e[0].val = 0;
231 gptimer->e[0].rld = 999; /* (((1000000 / 100) - 1)) */
234 LEON3_GPTIMER_RL | LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
240 * This function is intended for SHORT delays only.
242 unsigned long cpu_usec2ticks(unsigned long usec)
244 /* timer set to 1kHz ==> 1 clk tick = 1 msec */
247 return (usec / 1000);
250 unsigned long cpu_ticks2usec(unsigned long ticks)