169 lines
2.8 KiB
C
169 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015
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* Purna Chandra Mandal <purna.mandal@microchip.com>
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*
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <mach/pic32.h>
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#include <mach/ddr.h>
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#include <dt-bindings/clock/microchip,clock.h>
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/* Flash prefetch */
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#define PRECON 0x00
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/* Flash ECCCON */
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#define ECC_MASK 0x03
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#define ECC_SHIFT 4
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#define CLK_MHZ(x) ((x) / 1000000)
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DECLARE_GLOBAL_DATA_PTR;
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static ulong rate(int id)
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{
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int ret;
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struct udevice *dev;
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struct clk clk;
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ulong rate;
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ret = uclass_get_device(UCLASS_CLK, 0, &dev);
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if (ret) {
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printf("clk-uclass not found\n");
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return 0;
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}
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clk.id = id;
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ret = clk_request(dev, &clk);
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if (ret < 0)
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return ret;
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rate = clk_get_rate(&clk);
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clk_free(&clk);
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return rate;
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}
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static ulong clk_get_cpu_rate(void)
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{
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return rate(PB7CLK);
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}
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/* initialize prefetch module related to cpu_clk */
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static void prefetch_init(void)
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{
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struct pic32_reg_atomic *regs;
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const void __iomem *base;
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int v, nr_waits;
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ulong rate;
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/* cpu frequency in MHZ */
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rate = clk_get_cpu_rate() / 1000000;
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/* get flash ECC type */
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base = pic32_get_syscfg_base();
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v = (readl(base + CFGCON) >> ECC_SHIFT) & ECC_MASK;
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if (v < 2) {
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if (rate < 66)
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nr_waits = 0;
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else if (rate < 133)
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nr_waits = 1;
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else
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nr_waits = 2;
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} else {
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if (rate <= 83)
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nr_waits = 0;
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else if (rate <= 166)
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nr_waits = 1;
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else
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nr_waits = 2;
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}
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regs = ioremap(PREFETCH_BASE + PRECON, sizeof(*regs));
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writel(nr_waits, ®s->raw);
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/* Enable prefetch for all */
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writel(0x30, ®s->set);
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iounmap(regs);
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}
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/* arch specific CPU init after DM */
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int arch_cpu_init_dm(void)
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{
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/* flash prefetch */
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prefetch_init();
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return 0;
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}
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/* Un-gate DDR2 modules (gated by default) */
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static void ddr2_pmd_ungate(void)
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{
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void __iomem *regs;
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regs = pic32_get_syscfg_base();
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writel(0, regs + PMD7);
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}
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/* initialize the DDR2 Controller and DDR2 PHY */
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int dram_init(void)
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{
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ddr2_pmd_ungate();
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ddr2_phy_init();
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ddr2_ctrl_init();
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gd->ram_size = ddr2_calculate_size();
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return 0;
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}
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int misc_init_r(void)
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{
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set_io_port_base(0);
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return 0;
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}
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#ifdef CONFIG_DISPLAY_BOARDINFO
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const char *get_core_name(void)
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{
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u32 proc_id;
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const char *str;
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proc_id = read_c0_prid();
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switch (proc_id) {
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case 0x19e28:
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str = "PIC32MZ[DA]";
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break;
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default:
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str = "UNKNOWN";
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}
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return str;
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}
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#endif
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#ifdef CONFIG_CMD_CLK
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int soc_clk_dump(void)
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{
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int i;
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printf("PLL Speed: %lu MHz\n",
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CLK_MHZ(rate(PLLCLK)));
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printf("CPU Speed: %lu MHz\n", CLK_MHZ(rate(PB7CLK)));
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printf("MPLL Speed: %lu MHz\n", CLK_MHZ(rate(MPLL)));
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for (i = PB1CLK; i <= PB7CLK; i++)
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printf("PB%d Clock Speed: %lu MHz\n", i - PB1CLK + 1,
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CLK_MHZ(rate(i)));
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for (i = REF1CLK; i <= REF5CLK; i++)
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printf("REFO%d Clock Speed: %lu MHz\n", i - REF1CLK + 1,
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CLK_MHZ(rate(i)));
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return 0;
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}
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#endif
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