/* Initializes CPU and basic hardware such as memory
* controllers, IRQ controller and system timer 0.
*
- * (C) Copyright 2007
- * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
+ * (C) Copyright 2007, 2015
+ * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/asi.h>
#include <asm/leon.h>
+#include <asm/io.h>
#include <ambapp.h>
+#include <grlib/irqmp.h>
+#include <grlib/gptimer.h>
+#include <debug_uart.h>
#include <config.h>
-DECLARE_GLOBAL_DATA_PTR;
+/* Default Plug&Play I/O area */
+#ifndef CONFIG_AMBAPP_IOAREA
+#define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA
+#endif
-/* reset CPU (jump to 0, without reset) */
-void start(void);
+/* Select which TIMER that will become the time base */
+#ifndef CONFIG_SYS_GRLIB_GPTIMER_INDEX
+#define CONFIG_SYS_GRLIB_GPTIMER_INDEX 0
+#endif
-/* find & initialize the memory controller */
-int init_memory_ctrl(void);
+#define TIMER_BASE_CLK 1000000
+#define US_PER_TICK (1000000 / CONFIG_SYS_HZ)
-ambapp_dev_irqmp *irqmp = NULL;
-ambapp_dev_mctrl memctrl;
-ambapp_dev_gptimer *gptimer = NULL;
-unsigned int gptimer_irq = 0;
-int leon3_snooping_avail = 0;
+DECLARE_GLOBAL_DATA_PTR;
-struct {
- gd_t gd_area;
- bd_t bd;
-} global_data;
+ambapp_dev_irqmp *irqmp = NULL;
/*
* Breath some life into the CPU...
*
- * Set up the memory map,
- * initialize a bunch of registers.
- *
* Run from FLASH/PROM:
* - until memory controller is set up, only registers available
+ * - memory controller has already been setup up, stack can be used
* - no global variables available for writing
* - constants available
*/
-
void cpu_init_f(void)
{
- /* these varaiable must not be initialized */
- ambapp_dev_irqmp *irqmp;
+#ifdef CONFIG_DEBUG_UART
+ debug_uart_init();
+#endif
+}
+
+/* If cache snooping is available in hardware the result will be set
+ * to 0x800000, otherwise 0.
+ */
+static unsigned int snoop_detect(void)
+{
+ unsigned int result;
+ asm("lda [%%g0] 2, %0" : "=r"(result));
+ return result & 0x00800000;
+}
+
+int arch_cpu_init(void)
+{
ambapp_apbdev apbdev;
- register unsigned int apbmst;
-
- /* find AMBA APB Master */
- apbmst = (unsigned int)
- ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_APBMST, 1, 0);
- if (!apbmst) {
- /*
- * no AHB/APB bridge, something is wrong
- * ==> jump to start (or hang)
- */
- while (1) ;
- }
- /* Init memory controller */
- if (init_memory_ctrl()) {
- while (1) ;
- }
+ int index;
- /****************************************************
- * From here we can use the main memory and the stack.
- */
+ gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
+ gd->bus_clk = CONFIG_SYS_CLK_FREQ;
+ gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
- /* Find AMBA APB IRQMP Controller */
- if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev) != 1) {
- /* no IRQ controller, something is wrong
- * ==> jump to start (or hang)
- */
- while (1) ;
- }
- irqmp = (ambapp_dev_irqmp *) apbdev.address;
+ gd->arch.snooping_available = snoop_detect();
- /* initialize the IRQMP */
- irqmp->ilevel = 0xf; /* all IRQ off */
- irqmp->iforce = 0;
- irqmp->ipend = 0;
- irqmp->iclear = 0xfffe; /* clear all old pending interrupts */
- irqmp->cpu_mask[0] = 0; /* mask all IRQs on CPU 0 */
- irqmp->cpu_force[0] = 0; /* no force IRQ on CPU 0 */
+ /* Initialize the AMBA Plug & Play bus structure, the bus
+ * structure represents the AMBA bus that the CPU is located at.
+ */
+ ambapp_bus_init(CONFIG_AMBAPP_IOAREA, CONFIG_SYS_CLK_FREQ, &ambapp_plb);
- /* cache */
-}
+ /* Initialize/clear all the timers in the system.
+ */
+ for (index = 0; ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
+ GAISLER_GPTIMER, index, &apbdev) == 1; index++) {
+ ambapp_dev_gptimer *timer;
+ unsigned int bus_freq;
+ int i, ntimers;
-void cpu_init_f2(void)
-{
+ timer = (ambapp_dev_gptimer *)apbdev.address;
+ /* Different buses may have different frequency, the
+ * frequency of the bus tell in which frequency the timer
+ * prescaler operates.
+ */
+ bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
+
+ /* Initialize prescaler common to all timers to 1MHz */
+ timer->scalar = timer->scalar_reload =
+ (((bus_freq / 1000) + 500) / 1000) - 1;
+
+ /* Clear all timers */
+ ntimers = timer->config & 0x7;
+ for (i = 0; i < ntimers; i++) {
+ timer->e[i].ctrl = GPTIMER_CTRL_IP;
+ timer->e[i].rld = 0;
+ timer->e[i].ctrl = GPTIMER_CTRL_LD;
+ }
+ }
+
+ return 0;
}
/*
int cpu_init_r(void)
{
ambapp_apbdev apbdev;
+ int cpu;
/*
* Find AMBA APB IRQMP Controller,
- * When we come so far we know there is a IRQMP available
*/
- ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev);
- irqmp = (ambapp_dev_irqmp *) apbdev.address;
-
- /* timer */
- if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_GPTIMER, &apbdev) != 1) {
- printf("cpu_init_r: gptimer not found!\n");
- return 1;
- }
- gptimer = (ambapp_dev_gptimer *) apbdev.address;
- gptimer_irq = apbdev.irq;
-
- /* initialize prescaler common to all timers to 1MHz */
- gptimer->scalar = gptimer->scalar_reload =
- (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
-
- return (0);
-}
-
-/* find & setup memory controller */
-int init_memory_ctrl()
-{
- register ambapp_dev_mctrl *mctrl;
- register ambapp_dev_sdctrl *sdctrl;
- register ambapp_dev_ddrspa *ddrspa;
- register ambapp_dev_ddr2spa *ddr2spa;
- register ahbctrl_pp_dev *ahb;
- register unsigned int base;
- register int not_found_mctrl = -1;
-
- /* find ESA Memory controller */
- base = ambapp_apb_next_nomem(VENDOR_ESA, ESA_MCTRL, 0);
- if (base) {
- mctrl = (ambapp_dev_mctrl *) base;
-
- /* config MCTRL memory controller */
- mctrl->mcfg1 = CONFIG_SYS_GRLIB_MEMCFG1 | (mctrl->mcfg1 & 0x300);
- mctrl->mcfg2 = CONFIG_SYS_GRLIB_MEMCFG2;
- mctrl->mcfg3 = CONFIG_SYS_GRLIB_MEMCFG3;
- not_found_mctrl = 0;
+ if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
+ GAISLER_IRQMP, 0, &apbdev) != 1) {
+ panic("%s: IRQ controller not found\n", __func__);
+ return -1;
}
+ irqmp = (ambapp_dev_irqmp *)apbdev.address;
- /* find Gaisler Fault Tolerant Memory controller */
- base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_FTMCTRL, 0);
- if (base) {
- mctrl = (ambapp_dev_mctrl *) base;
-
- /* config MCTRL memory controller */
- mctrl->mcfg1 = CONFIG_SYS_GRLIB_FT_MEMCFG1 | (mctrl->mcfg1 & 0x300);
- mctrl->mcfg2 = CONFIG_SYS_GRLIB_FT_MEMCFG2;
- mctrl->mcfg3 = CONFIG_SYS_GRLIB_FT_MEMCFG3;
- not_found_mctrl = 0;
- }
-
- /* find SDRAM controller */
- base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_SDCTRL, 0);
- if (base) {
- sdctrl = (ambapp_dev_sdctrl *) base;
-
- /* config memory controller */
- sdctrl->sdcfg = CONFIG_SYS_GRLIB_SDRAM;
- not_found_mctrl = 0;
- }
-
- ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDR2SPA, 1, 0);
- if (ahb) {
- ddr2spa = (ambapp_dev_ddr2spa *) ambapp_ahb_get_info(ahb, 1);
-
- /* Config DDR2 memory controller */
- ddr2spa->cfg1 = CONFIG_SYS_GRLIB_DDR2_CFG1;
- ddr2spa->cfg3 = CONFIG_SYS_GRLIB_DDR2_CFG3;
- not_found_mctrl = 0;
- }
-
- ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDRSPA, 1, 0);
- if (ahb) {
- ddrspa = (ambapp_dev_ddrspa *) ambapp_ahb_get_info(ahb, 1);
-
- /* Config DDR memory controller */
- ddrspa->ctrl = CONFIG_SYS_GRLIB_DDR_CFG;
- not_found_mctrl = 0;
+ /* initialize the IRQMP */
+ irqmp->ilevel = 0xf; /* all IRQ off */
+ irqmp->iforce = 0;
+ irqmp->ipend = 0;
+ irqmp->iclear = 0xfffe; /* clear all old pending interrupts */
+ for (cpu = 0; cpu < 16; cpu++) {
+ /* mask and clear force for all IRQs on CPU[N] */
+ irqmp->cpu_mask[cpu] = 0;
+ irqmp->cpu_force[cpu] = 0;
}
- /* failed to find any memory controller */
- return not_found_mctrl;
+ return 0;
}
/* Uses Timer 0 to get accurate
while (get_timer(start) < ticks) ;
}
-/* initiate and setup timer0 interrupt to 1MHz
- * Return irq number for timer int or a negative number for
- * dealing with self
- */
int timer_interrupt_init_cpu(void)
{
- /* 1ms ticks */
- gptimer->e[0].val = 0;
- gptimer->e[0].rld = 999; /* (((1000000 / 100) - 1)) */
- gptimer->e[0].ctrl =
- (LEON3_GPTIMER_EN |
- LEON3_GPTIMER_RL | LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
-
- return gptimer_irq;
+ return -1;
}
/*
*/
unsigned long cpu_usec2ticks(unsigned long usec)
{
- /* timer set to 1kHz ==> 1 clk tick = 1 msec */
- if (usec < 1000)
+ if (usec < US_PER_TICK)
return 1;
- return (usec / 1000);
+ return usec / US_PER_TICK;
}
unsigned long cpu_ticks2usec(unsigned long ticks)
{
- /* 1tick = 1usec */
- return ticks * 1000;
+ return ticks * US_PER_TICK;
+}
+
+int timer_init(void)
+{
+ ambapp_dev_gptimer_element *tmr;
+ ambapp_dev_gptimer *gptimer;
+ ambapp_apbdev apbdev;
+ unsigned bus_freq;
+
+ if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER,
+ CONFIG_SYS_GRLIB_GPTIMER_INDEX, &apbdev) != 1) {
+ panic("%s: gptimer not found!\n", __func__);
+ return -1;
+ }
+
+ gptimer = (ambapp_dev_gptimer *) apbdev.address;
+
+ /* Different buses may have different frequency, the
+ * frequency of the bus tell in which frequency the timer
+ * prescaler operates.
+ */
+ bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
+
+ /* initialize prescaler common to all timers to 1MHz */
+ gptimer->scalar = gptimer->scalar_reload =
+ (((bus_freq / 1000) + 500) / 1000) - 1;
+
+ tmr = (ambapp_dev_gptimer_element *)&gptimer->e[0];
+
+ tmr->val = 0;
+ tmr->rld = ~0;
+ tmr->ctrl = GPTIMER_CTRL_EN | GPTIMER_CTRL_RS | GPTIMER_CTRL_LD;
+
+ CONFIG_SYS_TIMER_COUNTER = (void *)&tmr->val;
+ return 0;
}
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