3 * Marvell Semiconductor <www.marvell.com>
4 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
5 * Contributor: Mahavir Jain <mjain@marvell.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., 51 Franklin Street, Fifth Floor, Boston,
27 #include <asm/arch/armada100.h>
31 * Refer Section A.6 in Datasheet
33 struct armd1tmr_registers {
34 u32 clk_ctrl; /* Timer clk control reg */
35 u32 match[9]; /* Timer match registers */
36 u32 count[3]; /* Timer count registers */
39 u32 preload[3]; /* Timer preload value */
47 u32 cer; /* Timer count enable reg */
56 #define TIMER 0 /* Use TIMER 0 */
57 /* Each timer has 3 match registers */
58 #define MATCH_CMP(x) ((3 * TIMER) + x)
59 #define TIMER_LOAD_VAL 0xffffffff
60 #define COUNT_RD_REQ 0x1
62 DECLARE_GLOBAL_DATA_PTR;
63 /* Using gd->tbu from timestamp and gd->tbl for lastdec */
65 /* For preventing risk of instability in reading counter value,
66 * first set read request to register cvwr and then read same
67 * register after it captures counter value.
69 ulong read_timer(void)
71 struct armd1tmr_registers *armd1timers =
72 (struct armd1tmr_registers *) ARMD1_TIMER_BASE;
73 volatile int loop=100;
75 writel(COUNT_RD_REQ, &armd1timers->cvwr);
77 return(readl(&armd1timers->cvwr));
80 ulong get_timer_masked(void)
82 ulong now = read_timer();
86 gd->tbu += now - gd->tbl;
88 /* we have an overflow ... */
89 gd->tbu += now + TIMER_LOAD_VAL - gd->tbl;
96 ulong get_timer(ulong base)
98 return ((get_timer_masked() / (CONFIG_SYS_HZ_CLOCK / 1000)) -
102 void __udelay(unsigned long usec)
107 delayticks = (usec * (CONFIG_SYS_HZ_CLOCK / 1000000));
108 endtime = get_timer_masked() + delayticks;
110 while (get_timer_masked() < endtime);
118 struct armd1apb1_registers *apb1clkres =
119 (struct armd1apb1_registers *) ARMD1_APBC1_BASE;
120 struct armd1tmr_registers *armd1timers =
121 (struct armd1tmr_registers *) ARMD1_TIMER_BASE;
123 /* Enable Timer clock at 3.25 MHZ */
124 writel(APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(3), &apb1clkres->timers);
126 /* load value into timer */
127 writel(0x0, &armd1timers->clk_ctrl);
128 /* Use Timer 0 Match Resiger 0 */
129 writel(TIMER_LOAD_VAL, &armd1timers->match[MATCH_CMP(0)]);
130 /* Preload value is 0 */
131 writel(0x0, &armd1timers->preload[TIMER]);
132 /* Enable match comparator 0 for Timer 0 */
133 writel(0x1, &armd1timers->preload_ctrl[TIMER]);
136 writel(0x1, &armd1timers->cer);
137 /* init the gd->tbu and gd->tbl value */
138 gd->tbl = read_timer();
144 #define MPMU_APRR_WDTR (1<<4)
145 #define TMR_WFAR 0xbaba /* WDT Register First key */
146 #define TMP_WSAR 0xeb10 /* WDT Register Second key */
149 * This function uses internal Watchdog Timer
150 * based reset mechanism.
151 * Steps to write watchdog registers (protected access)
152 * 1. Write key value to TMR_WFAR reg.
153 * 2. Write key value to TMP_WSAR reg.
154 * 3. Perform write operation.
156 void reset_cpu (unsigned long ignored)
158 struct armd1mpmu_registers *mpmu =
159 (struct armd1mpmu_registers *) ARMD1_MPMU_BASE;
160 struct armd1tmr_registers *armd1timers =
161 (struct armd1tmr_registers *) ARMD1_TIMER_BASE;
164 /* negate hardware reset to the WDT after system reset */
165 val = readl(&mpmu->aprr);
166 val = val | MPMU_APRR_WDTR;
167 writel(val, &mpmu->aprr);
169 /* reset/enable WDT clock */
170 writel(APBC_APBCLK | APBC_FNCLK | APBC_RST, &mpmu->wdtpcr);
171 readl(&mpmu->wdtpcr);
172 writel(APBC_APBCLK | APBC_FNCLK, &mpmu->wdtpcr);
173 readl(&mpmu->wdtpcr);
175 /* clear previous WDT status */
176 writel(TMR_WFAR, &armd1timers->wfar);
177 writel(TMP_WSAR, &armd1timers->wsar);
178 writel(0, &armd1timers->wdt_sts);
180 /* set match counter */
181 writel(TMR_WFAR, &armd1timers->wfar);
182 writel(TMP_WSAR, &armd1timers->wsar);
183 writel(0xf, &armd1timers->wdt_match_r);
185 /* enable WDT reset */
186 writel(TMR_WFAR, &armd1timers->wfar);
187 writel(TMP_WSAR, &armd1timers->wsar);
188 writel(0x3, &armd1timers->wdt_match_en);