cregit-Linux how code gets into the kernel

Release 4.14 arch/arc/plat-hsdk/platform.c

/*
 * ARC HSDK Platform support code
 *
 * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/smp.h>
#include <asm/arcregs.h>
#include <asm/io.h>
#include <asm/mach_desc.h>


#define ARC_CCM_UNUSED_ADDR	0x60000000


static void __init hsdk_init_per_cpu(unsigned int cpu) { /* * By default ICCM is mapped to 0x7z while this area is used for * kernel virtual mappings, so move it to currently unused area. */ if (cpuinfo_arc700[cpu].iccm.sz) write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR); /* * By default DCCM is mapped to 0x8z while this area is used by kernel, * so move it to currently unused area. */ if (cpuinfo_arc700[cpu].dccm.sz) write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR); }

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Alexey Brodkin49100.00%1100.00%
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#define ARC_PERIPHERAL_BASE 0xf0000000 #define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000) #define CREG_PAE (CREG_BASE + 0x180) #define CREG_PAE_UPDATE (CREG_BASE + 0x194) #define CREG_CORE_IF_CLK_DIV (CREG_BASE + 0x4B8) #define CREG_CORE_IF_CLK_DIV_2 0x1 #define CGU_BASE ARC_PERIPHERAL_BASE #define CGU_PLL_STATUS (ARC_PERIPHERAL_BASE + 0x4) #define CGU_PLL_CTRL (ARC_PERIPHERAL_BASE + 0x0) #define CGU_PLL_STATUS_LOCK BIT(0) #define CGU_PLL_STATUS_ERR BIT(1) #define CGU_PLL_CTRL_1GHZ 0x3A10 #define HSDK_PLL_LOCK_TIMEOUT 500 #define HSDK_PLL_LOCKED() \ !!(ioread32((void __iomem *) CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK) #define HSDK_PLL_ERR() \ !!(ioread32((void __iomem *) CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR)
static void __init hsdk_set_cpu_freq_1ghz(void) { u32 timeout = HSDK_PLL_LOCK_TIMEOUT; /* * As we set cpu clock which exceeds 500MHz, the divider for the interface * clock must be programmed to div-by-2. */ iowrite32(CREG_CORE_IF_CLK_DIV_2, (void __iomem *) CREG_CORE_IF_CLK_DIV); /* Set cpu clock to 1GHz */ iowrite32(CGU_PLL_CTRL_1GHZ, (void __iomem *) CGU_PLL_CTRL); while (!HSDK_PLL_LOCKED() && timeout--) cpu_relax(); if (!HSDK_PLL_LOCKED() || HSDK_PLL_ERR()) pr_err("Failed to setup CPU frequency to 1GHz!"); }

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Eugeniy Paltsev66100.00%1100.00%
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#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000) #define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108) #define SDIO_UHS_REG_EXT_DIV_2 (2 << 30)
static void __init hsdk_init_early(void) { /* * PAE remapping for DMA clients does not work due to an RTL bug, so * CREG_PAE register must be programmed to all zeroes, otherwise it * will cause problems with DMA to/from peripherals even if PAE40 is * not used. */ /* Default is 1, which means "PAE offset = 4GByte" */ writel_relaxed(0, (void __iomem *) CREG_PAE); /* Really apply settings made above */ writel(1, (void __iomem *) CREG_PAE_UPDATE); /* * Switch SDIO external ciu clock divider from default div-by-8 to * minimum possible div-by-2. */ iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT); /* * Setup CPU frequency to 1GHz. * TODO: remove it after smart hsdk pll driver will be introduced. */ hsdk_set_cpu_freq_1ghz(); }

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Alexey Brodkin3667.92%133.33%
Eugeniy Paltsev1732.08%266.67%
Total53100.00%3100.00%

static const char *hsdk_compat[] __initconst = { "snps,hsdk", NULL, }; MACHINE_START(SIMULATION, "hsdk") .dt_compat = hsdk_compat, .init_early = hsdk_init_early, .init_per_cpu = hsdk_init_per_cpu, MACHINE_END

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Alexey Brodkin15752.33%133.33%
Eugeniy Paltsev14347.67%266.67%
Total300100.00%3100.00%
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