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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015
* Purna Chandra Mandal <purna.mandal@microchip.com>
*
*/
#include <clk.h>
#include <dm.h>
#include <event.h>
#include <init.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <mach/pic32.h>
#include <mach/ddr.h>
#include <dt-bindings/clock/microchip,clock.h>
/* Flash prefetch */
#define PRECON 0x00
/* Flash ECCCON */
#define ECC_MASK 0x03
#define ECC_SHIFT 4
#define CLK_MHZ(x) ((x) / 1000000)
DECLARE_GLOBAL_DATA_PTR;
static ulong rate(int id)
{
int ret;
struct udevice *dev;
struct clk clk;
ulong rate;
ret = uclass_get_device(UCLASS_CLK, 0, &dev);
if (ret) {
printf("clk-uclass not found\n");
return 0;
}
clk.id = id;
ret = clk_request(dev, &clk);
if (ret < 0)
return ret;
rate = clk_get_rate(&clk);
clk_free(&clk);
return rate;
}
static ulong clk_get_cpu_rate(void)
{
return rate(PB7CLK);
}
/* initialize prefetch module related to cpu_clk */
static int prefetch_init(void)
{
struct pic32_reg_atomic *regs;
const void __iomem *base;
int v, nr_waits;
ulong rate;
/* cpu frequency in MHZ */
rate = clk_get_cpu_rate() / 1000000;
/* get flash ECC type */
base = pic32_get_syscfg_base();
v = (readl(base + CFGCON) >> ECC_SHIFT) & ECC_MASK;
if (v < 2) {
if (rate < 66)
nr_waits = 0;
else if (rate < 133)
nr_waits = 1;
else
nr_waits = 2;
} else {
if (rate <= 83)
nr_waits = 0;
else if (rate <= 166)
nr_waits = 1;
else
nr_waits = 2;
}
regs = ioremap(PREFETCH_BASE + PRECON, sizeof(*regs));
writel(nr_waits, ®s->raw);
/* Enable prefetch for all */
writel(0x30, ®s->set);
iounmap(regs);
return 0;
}
/* arch-specific CPU init after DM: flash prefetch */
EVENT_SPY_SIMPLE(EVT_DM_POST_INIT_F, prefetch_init);
/* Un-gate DDR2 modules (gated by default) */
static void ddr2_pmd_ungate(void)
{
void __iomem *regs;
regs = pic32_get_syscfg_base();
writel(0, regs + PMD7);
}
/* initialize the DDR2 Controller and DDR2 PHY */
int dram_init(void)
{
ddr2_pmd_ungate();
ddr2_phy_init();
ddr2_ctrl_init();
gd->ram_size = ddr2_calculate_size();
return 0;
}
int misc_init_r(void)
{
set_io_port_base(0);
return 0;
}
#ifdef CONFIG_DISPLAY_BOARDINFO
const char *get_core_name(void)
{
u32 proc_id;
const char *str;
proc_id = read_c0_prid();
switch (proc_id) {
case 0x19e28:
str = "PIC32MZ[DA]";
break;
default:
str = "UNKNOWN";
}
return str;
}
#endif
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