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OpenCloudOS-Kernel/arch/mips/ralink/mt7620.c

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// 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 <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 __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();
}
}
void __init prom_soc_init(struct ralink_soc_info *soc_info)
{
void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7620_SYSC_BASE);
unsigned char *name = NULL;
u32 n0;
u32 n1;
u32 rev;
u32 cfg0;
u32 pmu0;
u32 pmu1;
u32 bga;
n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
rev = __raw_readl(sysc + SYSC_REG_CHIP_REV);
bga = (rev >> CHIP_REV_PKG_SHIFT) & CHIP_REV_PKG_MASK;
if (n0 == MT7620_CHIP_NAME0 && n1 == MT7620_CHIP_NAME1) {
if (bga) {
ralink_soc = MT762X_SOC_MT7620A;
name = "MT7620A";
soc_info->compatible = "ralink,mt7620a-soc";
} else {
ralink_soc = MT762X_SOC_MT7620N;
name = "MT7620N";
soc_info->compatible = "ralink,mt7620n-soc";
}
} else if (n0 == MT7620_CHIP_NAME0 && n1 == MT7628_CHIP_NAME1) {
u32 efuse = __raw_readl(sysc + SYSC_REG_EFUSE_CFG);
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";
} else {
panic("mt762x: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
}
snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
"MediaTek %s ver:%u eco:%u",
name,
(rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
(rev & CHIP_REV_ECO_MASK));
cfg0 = __raw_readl(sysc + 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(sysc + PMU0_CFG);
pmu1 = __raw_readl(sysc + 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"));
}
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