arch/mips/ralink/mt7620.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *
  * Parts of this file are based on Ralink's 2.6.21 BSP
  *
  * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  * Copyright (C) 2013 John Crispin <john@phrozen.org>
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/bug.h>
 #include <linux/slab.h>
 #include <linux/sys_soc.h>

 #include <asm/mipsregs.h>
 #include <asm/mach-ralink/ralink_regs.h>
 #include <asm/mach-ralink/mt7620.h>

 #include "common.h"

 /* analog */
 #define PMU0_CFG		0x88
 #define PMU_SW_SET		BIT(28)
 #define A_DCDC_EN		BIT(24)
 #define A_SSC_PERI		BIT(19)
 #define A_SSC_GEN		BIT(18)
 #define A_SSC_M			0x3
 #define A_SSC_S			16
 #define A_DLY_M			0x7
 #define A_DLY_S			8
 #define A_VTUNE_M		0xff

 /* digital */
 #define PMU1_CFG		0x8C
 #define DIG_SW_SEL		BIT(25)

 /* clock scaling */
 #define CLKCFG_FDIV_MASK	0x1f00
 #define CLKCFG_FDIV_USB_VAL	0x0300
 #define CLKCFG_FFRAC_MASK	0x001f
 #define CLKCFG_FFRAC_USB_VAL	0x0003

 /* EFUSE bits */
 #define EFUSE_MT7688		0x100000

 /* DRAM type bit */
 #define DRAM_TYPE_MT7628_MASK	0x1

 /* does the board have sdram or ddram */
 static int dram_type;

 static struct ralink_soc_info *soc_info_ptr;

 static __init u32
 mt7620_calc_rate(u32 ref_rate, u32 mul, u32 div)
 {
 	u64 t;

 	t = ref_rate;
 	t *= mul;
 	do_div(t, div);

 	return t;
 }

 #define MHZ(x)		((x) * 1000 * 1000)

 static __init unsigned long
 mt7620_get_xtal_rate(void)
 {
 	u32 reg;

 	reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
 	if (reg & SYSCFG0_XTAL_FREQ_SEL)
 		return MHZ(40);

 	return MHZ(20);
 }

 static __init unsigned long
 mt7620_get_periph_rate(unsigned long xtal_rate)
 {
 	u32 reg;

 	reg = rt_sysc_r32(SYSC_REG_CLKCFG0);
 	if (reg & CLKCFG0_PERI_CLK_SEL)
 		return xtal_rate;

 	return MHZ(40);
 }

 static const u32 mt7620_clk_divider[] __initconst = { 2, 3, 4, 8 };

 static __init unsigned long
 mt7620_get_cpu_pll_rate(unsigned long xtal_rate)
 {
 	u32 reg;
 	u32 mul;
 	u32 div;

 	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG0);
 	if (reg & CPLL_CFG0_BYPASS_REF_CLK)
 		return xtal_rate;

 	if ((reg & CPLL_CFG0_SW_CFG) == 0)
 		return MHZ(600);

 	mul = (reg >> CPLL_CFG0_PLL_MULT_RATIO_SHIFT) &
 	      CPLL_CFG0_PLL_MULT_RATIO_MASK;
 	mul += 24;
 	if (reg & CPLL_CFG0_LC_CURFCK)
 		mul *= 2;

 	div = (reg >> CPLL_CFG0_PLL_DIV_RATIO_SHIFT) &
 	      CPLL_CFG0_PLL_DIV_RATIO_MASK;

 	WARN_ON(div >= ARRAY_SIZE(mt7620_clk_divider));

 	return mt7620_calc_rate(xtal_rate, mul, mt7620_clk_divider[div]);
 }

 static __init unsigned long
 mt7620_get_pll_rate(unsigned long xtal_rate, unsigned long cpu_pll_rate)
 {
 	u32 reg;

 	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG1);
 	if (reg & CPLL_CFG1_CPU_AUX1)
 		return xtal_rate;

 	if (reg & CPLL_CFG1_CPU_AUX0)
 		return MHZ(480);

 	return cpu_pll_rate;
 }

 static __init unsigned long
 mt7620_get_cpu_rate(unsigned long pll_rate)
 {
 	u32 reg;
 	u32 mul;
 	u32 div;

 	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

 	mul = reg & CPU_SYS_CLKCFG_CPU_FFRAC_MASK;
 	div = (reg >> CPU_SYS_CLKCFG_CPU_FDIV_SHIFT) &
 	      CPU_SYS_CLKCFG_CPU_FDIV_MASK;

 	return mt7620_calc_rate(pll_rate, mul, div);
 }

 static const u32 mt7620_ocp_dividers[16] __initconst = {
 	[CPU_SYS_CLKCFG_OCP_RATIO_2] = 2,
 	[CPU_SYS_CLKCFG_OCP_RATIO_3] = 3,
 	[CPU_SYS_CLKCFG_OCP_RATIO_4] = 4,
 	[CPU_SYS_CLKCFG_OCP_RATIO_5] = 5,
 	[CPU_SYS_CLKCFG_OCP_RATIO_10] = 10,
 };

 static __init unsigned long
 mt7620_get_dram_rate(unsigned long pll_rate)
 {
 	if (dram_type == SYSCFG0_DRAM_TYPE_SDRAM)
 		return pll_rate / 4;

 	return pll_rate / 3;
 }

 static __init unsigned long
 mt7620_get_sys_rate(unsigned long cpu_rate)
 {
 	u32 reg;
 	u32 ocp_ratio;
 	u32 div;

 	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

 	ocp_ratio = (reg >> CPU_SYS_CLKCFG_OCP_RATIO_SHIFT) &
 		    CPU_SYS_CLKCFG_OCP_RATIO_MASK;

 	if (WARN_ON(ocp_ratio >= ARRAY_SIZE(mt7620_ocp_dividers)))
 		return cpu_rate;

 	div = mt7620_ocp_dividers[ocp_ratio];
 	if (WARN(!div, "invalid divider for OCP ratio %u", ocp_ratio))
 		return cpu_rate;

 	return cpu_rate / div;
 }

 void __init ralink_clk_init(void)
 {
 	unsigned long xtal_rate;
 	unsigned long cpu_pll_rate;
 	unsigned long pll_rate;
 	unsigned long cpu_rate;
 	unsigned long sys_rate;
 	unsigned long dram_rate;
 	unsigned long periph_rate;
 	unsigned long pcmi2s_rate;

 	xtal_rate = mt7620_get_xtal_rate();

 #define RFMT(label)	label ":%lu.%03luMHz "
 #define RINT(x)		((x) / 1000000)
 #define RFRAC(x)	(((x) / 1000) % 1000)

 	if (is_mt76x8()) {
 		if (xtal_rate == MHZ(40))
 			cpu_rate = MHZ(580);
 		else
 			cpu_rate = MHZ(575);
 		dram_rate = sys_rate = cpu_rate / 3;
 		periph_rate = MHZ(40);
 		pcmi2s_rate = MHZ(480);

 		ralink_clk_add("10000d00.uartlite", periph_rate);
 		ralink_clk_add("10000e00.uartlite", periph_rate);
 	} else {
 		cpu_pll_rate = mt7620_get_cpu_pll_rate(xtal_rate);
 		pll_rate = mt7620_get_pll_rate(xtal_rate, cpu_pll_rate);

 		cpu_rate = mt7620_get_cpu_rate(pll_rate);
 		dram_rate = mt7620_get_dram_rate(pll_rate);
 		sys_rate = mt7620_get_sys_rate(cpu_rate);
 		periph_rate = mt7620_get_periph_rate(xtal_rate);
 		pcmi2s_rate = periph_rate;

 		pr_debug(RFMT("XTAL") RFMT("CPU_PLL") RFMT("PLL"),
 			 RINT(xtal_rate), RFRAC(xtal_rate),
 			 RINT(cpu_pll_rate), RFRAC(cpu_pll_rate),
 			 RINT(pll_rate), RFRAC(pll_rate));

 		ralink_clk_add("10000500.uart", periph_rate);
 	}

 	pr_debug(RFMT("CPU") RFMT("DRAM") RFMT("SYS") RFMT("PERIPH"),
 		 RINT(cpu_rate), RFRAC(cpu_rate),
 		 RINT(dram_rate), RFRAC(dram_rate),
 		 RINT(sys_rate), RFRAC(sys_rate),
 		 RINT(periph_rate), RFRAC(periph_rate));
 #undef RFRAC
 #undef RINT
 #undef RFMT

 	ralink_clk_add("cpu", cpu_rate);
 	ralink_clk_add("10000100.timer", periph_rate);
 	ralink_clk_add("10000120.watchdog", periph_rate);
 	ralink_clk_add("10000900.i2c", periph_rate);
 	ralink_clk_add("10000a00.i2s", pcmi2s_rate);
 	ralink_clk_add("10000b00.spi", sys_rate);
 	ralink_clk_add("10000b40.spi", sys_rate);
 	ralink_clk_add("10000c00.uartlite", periph_rate);
 	ralink_clk_add("10000d00.uart1", periph_rate);
 	ralink_clk_add("10000e00.uart2", periph_rate);
 	ralink_clk_add("10180000.wmac", xtal_rate);

 	if (IS_ENABLED(CONFIG_USB) && !is_mt76x8()) {
 		/*
 		 * When the CPU goes into sleep mode, the BUS clock will be
 		 * too low for USB to function properly. Adjust the busses
 		 * fractional divider to fix this
 		 */
 		u32 val = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

 		val &= ~(CLKCFG_FDIV_MASK | CLKCFG_FFRAC_MASK);
 		val |= CLKCFG_FDIV_USB_VAL | CLKCFG_FFRAC_USB_VAL;

 		rt_sysc_w32(val, SYSC_REG_CPU_SYS_CLKCFG);
 	}
 }

 void __init ralink_of_remap(void)
 {
 	rt_sysc_membase = plat_of_remap_node("ralink,mt7620a-sysc");
 	rt_memc_membase = plat_of_remap_node("ralink,mt7620a-memc");

 	if (!rt_sysc_membase || !rt_memc_membase)
 		panic("Failed to remap core resources");
 }

 static __init void
 mt7620_dram_init(struct ralink_soc_info *soc_info)
 {
 	switch (dram_type) {
 	case SYSCFG0_DRAM_TYPE_SDRAM:
 		pr_info("Board has SDRAM\n");
 		soc_info->mem_size_min = MT7620_SDRAM_SIZE_MIN;
 		soc_info->mem_size_max = MT7620_SDRAM_SIZE_MAX;
 		break;

 	case SYSCFG0_DRAM_TYPE_DDR1:
 		pr_info("Board has DDR1\n");
 		soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
 		soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
 		break;

 	case SYSCFG0_DRAM_TYPE_DDR2:
 		pr_info("Board has DDR2\n");
 		soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
 		soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
 		break;
 	default:
 		BUG();
 	}
 }

 static __init void
 mt7628_dram_init(struct ralink_soc_info *soc_info)
 {
 	switch (dram_type) {
 	case SYSCFG0_DRAM_TYPE_DDR1_MT7628:
 		pr_info("Board has DDR1\n");
 		soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
 		soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
 		break;

 	case SYSCFG0_DRAM_TYPE_DDR2_MT7628:
 		pr_info("Board has DDR2\n");
 		soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
 		soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
 		break;
 	default:
 		BUG();
 	}
 }

 static unsigned int __init mt7620_get_soc_name0(void)
 {
 	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_NAME0);
 }

 static unsigned int __init mt7620_get_soc_name1(void)
 {
 	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_NAME1);
 }

 static bool __init mt7620_soc_valid(void)
 {
 	if (mt7620_get_soc_name0() == MT7620_CHIP_NAME0 &&
 	    mt7620_get_soc_name1() == MT7620_CHIP_NAME1)
 		return true;
 	else
 		return false;
 }

 static bool __init mt7628_soc_valid(void)
 {
 	if (mt7620_get_soc_name0() == MT7620_CHIP_NAME0 &&
 	    mt7620_get_soc_name1() == MT7628_CHIP_NAME1)
 		return true;
 	else
 		return false;
 }

 static unsigned int __init mt7620_get_rev(void)
 {
 	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_REV);
 }

 static unsigned int __init mt7620_get_bga(void)
 {
 	return (mt7620_get_rev() >> CHIP_REV_PKG_SHIFT) & CHIP_REV_PKG_MASK;
 }

 static unsigned int __init mt7620_get_efuse(void)
 {
 	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_EFUSE_CFG);
 }

 static unsigned int __init mt7620_get_soc_ver(void)
 {
 	return (mt7620_get_rev() >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK;
 }

 static unsigned int __init mt7620_get_soc_eco(void)
 {
 	return (mt7620_get_rev() & CHIP_REV_ECO_MASK);
 }

 static const char __init *mt7620_get_soc_name(struct ralink_soc_info *soc_info)
 {
 	if (mt7620_soc_valid()) {
 		u32 bga = mt7620_get_bga();

 		if (bga) {
 			ralink_soc = MT762X_SOC_MT7620A;
 			soc_info->compatible = "ralink,mt7620a-soc";
 			return "MT7620A";
 		} else {
 			ralink_soc = MT762X_SOC_MT7620N;
 			soc_info->compatible = "ralink,mt7620n-soc";
 			return "MT7620N";
 		}
 	} else if (mt7628_soc_valid()) {
 		u32 efuse = mt7620_get_efuse();
 		unsigned char *name = NULL;

 		if (efuse & EFUSE_MT7688) {
 			ralink_soc = MT762X_SOC_MT7688;
 			name = "MT7688";
 		} else {
 			ralink_soc = MT762X_SOC_MT7628AN;
 			name = "MT7628AN";
 		}
 		soc_info->compatible = "ralink,mt7628an-soc";
 		return name;
 	} else {
 		panic("mt762x: unknown SoC, n0:%08x n1:%08x\n",
 		      mt7620_get_soc_name0(), mt7620_get_soc_name1());
 	}
 }

 static const char __init *mt7620_get_soc_id_name(void)
 {
 	if (ralink_soc == MT762X_SOC_MT7620A)
 		return "mt7620a";
 	else if (ralink_soc == MT762X_SOC_MT7620N)
 		return "mt7620n";
 	else if (ralink_soc == MT762X_SOC_MT7688)
 		return "mt7688";
 	else if (ralink_soc == MT762X_SOC_MT7628AN)
 		return "mt7628n";
 	else
 		return "invalid";
 }

 static int __init mt7620_soc_dev_init(void)
 {
 	struct soc_device *soc_dev;
 	struct soc_device_attribute *soc_dev_attr;

 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 	if (!soc_dev_attr)
 		return -ENOMEM;

 	soc_dev_attr->family = "Ralink";
 	soc_dev_attr->soc_id = mt7620_get_soc_id_name();

 	soc_dev_attr->data = soc_info_ptr;

 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev)) {
 		kfree(soc_dev_attr);
 		return PTR_ERR(soc_dev);
 	}

 	return 0;
 }
 device_initcall(mt7620_soc_dev_init);

 void __init prom_soc_init(struct ralink_soc_info *soc_info)
 {
 	const char *name = mt7620_get_soc_name(soc_info);
 	u32 cfg0;
 	u32 pmu0;
 	u32 pmu1;

 	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
 		"MediaTek %s ver:%u eco:%u",
 		name, mt7620_get_soc_ver(), mt7620_get_soc_eco());

 	cfg0 = __raw_readl(MT7620_SYSC_BASE + SYSC_REG_SYSTEM_CONFIG0);
 	if (is_mt76x8()) {
 		dram_type = cfg0 & DRAM_TYPE_MT7628_MASK;
 	} else {
 		dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) &
 			    SYSCFG0_DRAM_TYPE_MASK;
 		if (dram_type == SYSCFG0_DRAM_TYPE_UNKNOWN)
 			dram_type = SYSCFG0_DRAM_TYPE_SDRAM;
 	}

 	soc_info->mem_base = MT7620_DRAM_BASE;
 	if (is_mt76x8())
 		mt7628_dram_init(soc_info);
 	else
 		mt7620_dram_init(soc_info);

 	pmu0 = __raw_readl(MT7620_SYSC_BASE + PMU0_CFG);
 	pmu1 = __raw_readl(MT7620_SYSC_BASE + PMU1_CFG);

 	pr_info("Analog PMU set to %s control\n",
 		(pmu0 & PMU_SW_SET) ? ("sw") : ("hw"));
 	pr_info("Digital PMU set to %s control\n",
 		(pmu1 & DIG_SW_SEL) ? ("sw") : ("hw"));

 	soc_info_ptr = soc_info;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	*
	* Parts of this file are based on Ralink's 2.6.21 BSP
	*
	* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
	* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
	* Copyright (C) 2013 John Crispin <john@phrozen.org>
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/bug.h>
	#include <linux/slab.h>
	#include <linux/sys_soc.h>

	#include <asm/mipsregs.h>
	#include <asm/mach-ralink/ralink_regs.h>
	#include <asm/mach-ralink/mt7620.h>

	#include "common.h"

	/* analog */
	#define PMU0_CFG 0x88
	#define PMU_SW_SET BIT(28)
	#define A_DCDC_EN BIT(24)
	#define A_SSC_PERI BIT(19)
	#define A_SSC_GEN BIT(18)
	#define A_SSC_M 0x3
	#define A_SSC_S 16
	#define A_DLY_M 0x7
	#define A_DLY_S 8
	#define A_VTUNE_M 0xff

	/* digital */
	#define PMU1_CFG 0x8C
	#define DIG_SW_SEL BIT(25)

	/* clock scaling */
	#define CLKCFG_FDIV_MASK 0x1f00
	#define CLKCFG_FDIV_USB_VAL 0x0300
	#define CLKCFG_FFRAC_MASK 0x001f
	#define CLKCFG_FFRAC_USB_VAL 0x0003

	/* EFUSE bits */
	#define EFUSE_MT7688 0x100000

	/* DRAM type bit */
	#define DRAM_TYPE_MT7628_MASK 0x1

	/* does the board have sdram or ddram */
	static int dram_type;

	static struct ralink_soc_info *soc_info_ptr;

	static __init u32
	mt7620_calc_rate(u32 ref_rate, u32 mul, u32 div)
	{
	u64 t;

	t = ref_rate;
	t *= mul;
	do_div(t, div);

	return t;
	}

	#define MHZ(x) ((x) * 1000 * 1000)

	static __init unsigned long
	mt7620_get_xtal_rate(void)
	{
	u32 reg;

	reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
	if (reg & SYSCFG0_XTAL_FREQ_SEL)
	return MHZ(40);

	return MHZ(20);
	}

	static __init unsigned long
	mt7620_get_periph_rate(unsigned long xtal_rate)
	{
	u32 reg;

	reg = rt_sysc_r32(SYSC_REG_CLKCFG0);
	if (reg & CLKCFG0_PERI_CLK_SEL)
	return xtal_rate;

	return MHZ(40);
	}

	static const u32 mt7620_clk_divider[] __initconst = { 2, 3, 4, 8 };

	static __init unsigned long
	mt7620_get_cpu_pll_rate(unsigned long xtal_rate)
	{
	u32 reg;
	u32 mul;
	u32 div;

	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG0);
	if (reg & CPLL_CFG0_BYPASS_REF_CLK)
	return xtal_rate;

	if ((reg & CPLL_CFG0_SW_CFG) == 0)
	return MHZ(600);

	mul = (reg >> CPLL_CFG0_PLL_MULT_RATIO_SHIFT) &
	CPLL_CFG0_PLL_MULT_RATIO_MASK;
	mul += 24;
	if (reg & CPLL_CFG0_LC_CURFCK)
	mul *= 2;

	div = (reg >> CPLL_CFG0_PLL_DIV_RATIO_SHIFT) &
	CPLL_CFG0_PLL_DIV_RATIO_MASK;

	WARN_ON(div >= ARRAY_SIZE(mt7620_clk_divider));

	return mt7620_calc_rate(xtal_rate, mul, mt7620_clk_divider[div]);
	}

	static __init unsigned long
	mt7620_get_pll_rate(unsigned long xtal_rate, unsigned long cpu_pll_rate)
	{
	u32 reg;

	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG1);
	if (reg & CPLL_CFG1_CPU_AUX1)
	return xtal_rate;

	if (reg & CPLL_CFG1_CPU_AUX0)
	return MHZ(480);

	return cpu_pll_rate;
	}

	static __init unsigned long
	mt7620_get_cpu_rate(unsigned long pll_rate)
	{
	u32 reg;
	u32 mul;
	u32 div;

	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

	mul = reg & CPU_SYS_CLKCFG_CPU_FFRAC_MASK;
	div = (reg >> CPU_SYS_CLKCFG_CPU_FDIV_SHIFT) &
	CPU_SYS_CLKCFG_CPU_FDIV_MASK;

	return mt7620_calc_rate(pll_rate, mul, div);
	}

	static const u32 mt7620_ocp_dividers[16] __initconst = {
	[CPU_SYS_CLKCFG_OCP_RATIO_2] = 2,
	[CPU_SYS_CLKCFG_OCP_RATIO_3] = 3,
	[CPU_SYS_CLKCFG_OCP_RATIO_4] = 4,
	[CPU_SYS_CLKCFG_OCP_RATIO_5] = 5,
	[CPU_SYS_CLKCFG_OCP_RATIO_10] = 10,
	};

	static __init unsigned long
	mt7620_get_dram_rate(unsigned long pll_rate)
	{
	if (dram_type == SYSCFG0_DRAM_TYPE_SDRAM)
	return pll_rate / 4;

	return pll_rate / 3;
	}

	static __init unsigned long
	mt7620_get_sys_rate(unsigned long cpu_rate)
	{
	u32 reg;
	u32 ocp_ratio;
	u32 div;

	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

	ocp_ratio = (reg >> CPU_SYS_CLKCFG_OCP_RATIO_SHIFT) &
	CPU_SYS_CLKCFG_OCP_RATIO_MASK;

	if (WARN_ON(ocp_ratio >= ARRAY_SIZE(mt7620_ocp_dividers)))
	return cpu_rate;

	div = mt7620_ocp_dividers[ocp_ratio];
	if (WARN(!div, "invalid divider for OCP ratio %u", ocp_ratio))
	return cpu_rate;

	return cpu_rate / div;
	}

	void __init ralink_clk_init(void)
	{
	unsigned long xtal_rate;
	unsigned long cpu_pll_rate;
	unsigned long pll_rate;
	unsigned long cpu_rate;
	unsigned long sys_rate;
	unsigned long dram_rate;
	unsigned long periph_rate;
	unsigned long pcmi2s_rate;

	xtal_rate = mt7620_get_xtal_rate();

	#define RFMT(label) label ":%lu.%03luMHz "
	#define RINT(x) ((x) / 1000000)
	#define RFRAC(x) (((x) / 1000) % 1000)

	if (is_mt76x8()) {
	if (xtal_rate == MHZ(40))
	cpu_rate = MHZ(580);
	else
	cpu_rate = MHZ(575);
	dram_rate = sys_rate = cpu_rate / 3;
	periph_rate = MHZ(40);
	pcmi2s_rate = MHZ(480);

	ralink_clk_add("10000d00.uartlite", periph_rate);
	ralink_clk_add("10000e00.uartlite", periph_rate);
	} else {
	cpu_pll_rate = mt7620_get_cpu_pll_rate(xtal_rate);
	pll_rate = mt7620_get_pll_rate(xtal_rate, cpu_pll_rate);

	cpu_rate = mt7620_get_cpu_rate(pll_rate);
	dram_rate = mt7620_get_dram_rate(pll_rate);
	sys_rate = mt7620_get_sys_rate(cpu_rate);
	periph_rate = mt7620_get_periph_rate(xtal_rate);
	pcmi2s_rate = periph_rate;

	pr_debug(RFMT("XTAL") RFMT("CPU_PLL") RFMT("PLL"),
	RINT(xtal_rate), RFRAC(xtal_rate),
	RINT(cpu_pll_rate), RFRAC(cpu_pll_rate),
	RINT(pll_rate), RFRAC(pll_rate));

	ralink_clk_add("10000500.uart", periph_rate);
	}

	pr_debug(RFMT("CPU") RFMT("DRAM") RFMT("SYS") RFMT("PERIPH"),
	RINT(cpu_rate), RFRAC(cpu_rate),
	RINT(dram_rate), RFRAC(dram_rate),
	RINT(sys_rate), RFRAC(sys_rate),
	RINT(periph_rate), RFRAC(periph_rate));
	#undef RFRAC
	#undef RINT
	#undef RFMT

	ralink_clk_add("cpu", cpu_rate);
	ralink_clk_add("10000100.timer", periph_rate);
	ralink_clk_add("10000120.watchdog", periph_rate);
	ralink_clk_add("10000900.i2c", periph_rate);
	ralink_clk_add("10000a00.i2s", pcmi2s_rate);
	ralink_clk_add("10000b00.spi", sys_rate);
	ralink_clk_add("10000b40.spi", sys_rate);
	ralink_clk_add("10000c00.uartlite", periph_rate);
	ralink_clk_add("10000d00.uart1", periph_rate);
	ralink_clk_add("10000e00.uart2", periph_rate);
	ralink_clk_add("10180000.wmac", xtal_rate);

	if (IS_ENABLED(CONFIG_USB) && !is_mt76x8()) {
	/*
	* When the CPU goes into sleep mode, the BUS clock will be
	* too low for USB to function properly. Adjust the busses
	* fractional divider to fix this
	*/
	u32 val = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);

	val &= ~(CLKCFG_FDIV_MASK \| CLKCFG_FFRAC_MASK);
	val \|= CLKCFG_FDIV_USB_VAL \| CLKCFG_FFRAC_USB_VAL;

	rt_sysc_w32(val, SYSC_REG_CPU_SYS_CLKCFG);
	}
	}

	void __init ralink_of_remap(void)
	{
	rt_sysc_membase = plat_of_remap_node("ralink,mt7620a-sysc");
	rt_memc_membase = plat_of_remap_node("ralink,mt7620a-memc");

	if (!rt_sysc_membase \|\| !rt_memc_membase)
	panic("Failed to remap core resources");
	}

	static __init void
	mt7620_dram_init(struct ralink_soc_info *soc_info)
	{
	switch (dram_type) {
	case SYSCFG0_DRAM_TYPE_SDRAM:
	pr_info("Board has SDRAM\n");
	soc_info->mem_size_min = MT7620_SDRAM_SIZE_MIN;
	soc_info->mem_size_max = MT7620_SDRAM_SIZE_MAX;
	break;

	case SYSCFG0_DRAM_TYPE_DDR1:
	pr_info("Board has DDR1\n");
	soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
	soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
	break;

	case SYSCFG0_DRAM_TYPE_DDR2:
	pr_info("Board has DDR2\n");
	soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
	soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
	break;
	default:
	BUG();
	}
	}

	static __init void
	mt7628_dram_init(struct ralink_soc_info *soc_info)
	{
	switch (dram_type) {
	case SYSCFG0_DRAM_TYPE_DDR1_MT7628:
	pr_info("Board has DDR1\n");
	soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
	soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
	break;

	case SYSCFG0_DRAM_TYPE_DDR2_MT7628:
	pr_info("Board has DDR2\n");
	soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
	soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
	break;
	default:
	BUG();
	}
	}

	static unsigned int __init mt7620_get_soc_name0(void)
	{
	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_NAME0);
	}

	static unsigned int __init mt7620_get_soc_name1(void)
	{
	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_NAME1);
	}

	static bool __init mt7620_soc_valid(void)
	{
	if (mt7620_get_soc_name0() == MT7620_CHIP_NAME0 &&
	mt7620_get_soc_name1() == MT7620_CHIP_NAME1)
	return true;
	else
	return false;
	}

	static bool __init mt7628_soc_valid(void)
	{
	if (mt7620_get_soc_name0() == MT7620_CHIP_NAME0 &&
	mt7620_get_soc_name1() == MT7628_CHIP_NAME1)
	return true;
	else
	return false;
	}

	static unsigned int __init mt7620_get_rev(void)
	{
	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_CHIP_REV);
	}

	static unsigned int __init mt7620_get_bga(void)
	{
	return (mt7620_get_rev() >> CHIP_REV_PKG_SHIFT) & CHIP_REV_PKG_MASK;
	}

	static unsigned int __init mt7620_get_efuse(void)
	{
	return __raw_readl(MT7620_SYSC_BASE + SYSC_REG_EFUSE_CFG);
	}

	static unsigned int __init mt7620_get_soc_ver(void)
	{
	return (mt7620_get_rev() >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK;
	}

	static unsigned int __init mt7620_get_soc_eco(void)
	{
	return (mt7620_get_rev() & CHIP_REV_ECO_MASK);
	}

	static const char __init mt7620_get_soc_name(struct ralink_soc_info soc_info)
	{
	if (mt7620_soc_valid()) {
	u32 bga = mt7620_get_bga();

	if (bga) {
	ralink_soc = MT762X_SOC_MT7620A;
	soc_info->compatible = "ralink,mt7620a-soc";
	return "MT7620A";
	} else {
	ralink_soc = MT762X_SOC_MT7620N;
	soc_info->compatible = "ralink,mt7620n-soc";
	return "MT7620N";
	}
	} else if (mt7628_soc_valid()) {
	u32 efuse = mt7620_get_efuse();
	unsigned char *name = NULL;

	if (efuse & EFUSE_MT7688) {
	ralink_soc = MT762X_SOC_MT7688;
	name = "MT7688";
	} else {
	ralink_soc = MT762X_SOC_MT7628AN;
	name = "MT7628AN";
	}
	soc_info->compatible = "ralink,mt7628an-soc";
	return name;
	} else {
	panic("mt762x: unknown SoC, n0:%08x n1:%08x\n",
	mt7620_get_soc_name0(), mt7620_get_soc_name1());
	}
	}

	static const char __init *mt7620_get_soc_id_name(void)
	{
	if (ralink_soc == MT762X_SOC_MT7620A)
	return "mt7620a";
	else if (ralink_soc == MT762X_SOC_MT7620N)
	return "mt7620n";
	else if (ralink_soc == MT762X_SOC_MT7688)
	return "mt7688";
	else if (ralink_soc == MT762X_SOC_MT7628AN)
	return "mt7628n";
	else
	return "invalid";
	}

	static int __init mt7620_soc_dev_init(void)
	{
	struct soc_device *soc_dev;
	struct soc_device_attribute *soc_dev_attr;

	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
	if (!soc_dev_attr)
	return -ENOMEM;

	soc_dev_attr->family = "Ralink";
	soc_dev_attr->soc_id = mt7620_get_soc_id_name();

	soc_dev_attr->data = soc_info_ptr;

	soc_dev = soc_device_register(soc_dev_attr);
	if (IS_ERR(soc_dev)) {
	kfree(soc_dev_attr);
	return PTR_ERR(soc_dev);
	}

	return 0;
	}
	device_initcall(mt7620_soc_dev_init);

	void __init prom_soc_init(struct ralink_soc_info *soc_info)
	{
	const char *name = mt7620_get_soc_name(soc_info);
	u32 cfg0;
	u32 pmu0;
	u32 pmu1;

	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
	"MediaTek %s ver:%u eco:%u",
	name, mt7620_get_soc_ver(), mt7620_get_soc_eco());

	cfg0 = __raw_readl(MT7620_SYSC_BASE + SYSC_REG_SYSTEM_CONFIG0);
	if (is_mt76x8()) {
	dram_type = cfg0 & DRAM_TYPE_MT7628_MASK;
	} else {
	dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) &
	SYSCFG0_DRAM_TYPE_MASK;
	if (dram_type == SYSCFG0_DRAM_TYPE_UNKNOWN)
	dram_type = SYSCFG0_DRAM_TYPE_SDRAM;
	}

	soc_info->mem_base = MT7620_DRAM_BASE;
	if (is_mt76x8())
	mt7628_dram_init(soc_info);
	else
	mt7620_dram_init(soc_info);

	pmu0 = __raw_readl(MT7620_SYSC_BASE + PMU0_CFG);
	pmu1 = __raw_readl(MT7620_SYSC_BASE + PMU1_CFG);

	pr_info("Analog PMU set to %s control\n",
	(pmu0 & PMU_SW_SET) ? ("sw") : ("hw"));
	pr_info("Digital PMU set to %s control\n",
	(pmu1 & DIG_SW_SEL) ? ("sw") : ("hw"));

	soc_info_ptr = soc_info;
	}