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linux-zen-server/drivers/clk/ingenic/x1000-cgu.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* X1000 SoC CGU driver
* Copyright (c) 2019 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
*/
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/rational.h>
#include <dt-bindings/clock/ingenic,x1000-cgu.h>
#include "cgu.h"
#include "pm.h"
/* CGU register offsets */
#define CGU_REG_CPCCR 0x00
#define CGU_REG_APLL 0x10
#define CGU_REG_MPLL 0x14
#define CGU_REG_CLKGR 0x20
#define CGU_REG_OPCR 0x24
#define CGU_REG_DDRCDR 0x2c
#define CGU_REG_USBPCR 0x3c
#define CGU_REG_USBPCR1 0x48
#define CGU_REG_USBCDR 0x50
#define CGU_REG_MACCDR 0x54
#define CGU_REG_I2SCDR 0x60
#define CGU_REG_LPCDR 0x64
#define CGU_REG_MSC0CDR 0x68
#define CGU_REG_I2SCDR1 0x70
#define CGU_REG_SSICDR 0x74
#define CGU_REG_CIMCDR 0x7c
#define CGU_REG_PCMCDR 0x84
#define CGU_REG_MSC1CDR 0xa4
#define CGU_REG_CMP_INTR 0xb0
#define CGU_REG_CMP_INTRE 0xb4
#define CGU_REG_DRCG 0xd0
#define CGU_REG_CPCSR 0xd4
#define CGU_REG_PCMCDR1 0xe0
#define CGU_REG_MACPHYC 0xe8
/* bits within the OPCR register */
#define OPCR_SPENDN0 BIT(7)
#define OPCR_SPENDN1 BIT(6)
/* bits within the USBPCR register */
#define USBPCR_SIDDQ BIT(21)
#define USBPCR_OTG_DISABLE BIT(20)
/* bits within the USBPCR1 register */
#define USBPCR1_REFCLKSEL_SHIFT 26
#define USBPCR1_REFCLKSEL_MASK (0x3 << USBPCR1_REFCLKSEL_SHIFT)
#define USBPCR1_REFCLKSEL_CORE (0x2 << USBPCR1_REFCLKSEL_SHIFT)
#define USBPCR1_REFCLKDIV_SHIFT 24
#define USBPCR1_REFCLKDIV_MASK (0x3 << USBPCR1_REFCLKDIV_SHIFT)
#define USBPCR1_REFCLKDIV_48 (0x2 << USBPCR1_REFCLKDIV_SHIFT)
#define USBPCR1_REFCLKDIV_24 (0x1 << USBPCR1_REFCLKDIV_SHIFT)
#define USBPCR1_REFCLKDIV_12 (0x0 << USBPCR1_REFCLKDIV_SHIFT)
static struct ingenic_cgu *cgu;
static unsigned long x1000_otg_phy_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
u32 usbpcr1;
unsigned refclk_div;
usbpcr1 = readl(cgu->base + CGU_REG_USBPCR1);
refclk_div = usbpcr1 & USBPCR1_REFCLKDIV_MASK;
switch (refclk_div) {
case USBPCR1_REFCLKDIV_12:
return 12000000;
case USBPCR1_REFCLKDIV_24:
return 24000000;
case USBPCR1_REFCLKDIV_48:
return 48000000;
}
return parent_rate;
}
static long x1000_otg_phy_round_rate(struct clk_hw *hw, unsigned long req_rate,
unsigned long *parent_rate)
{
if (req_rate < 18000000)
return 12000000;
if (req_rate < 36000000)
return 24000000;
return 48000000;
}
static int x1000_otg_phy_set_rate(struct clk_hw *hw, unsigned long req_rate,
unsigned long parent_rate)
{
unsigned long flags;
u32 usbpcr1, div_bits;
switch (req_rate) {
case 12000000:
div_bits = USBPCR1_REFCLKDIV_12;
break;
case 24000000:
div_bits = USBPCR1_REFCLKDIV_24;
break;
case 48000000:
div_bits = USBPCR1_REFCLKDIV_48;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&cgu->lock, flags);
usbpcr1 = readl(cgu->base + CGU_REG_USBPCR1);
usbpcr1 &= ~USBPCR1_REFCLKDIV_MASK;
usbpcr1 |= div_bits;
writel(usbpcr1, cgu->base + CGU_REG_USBPCR1);
spin_unlock_irqrestore(&cgu->lock, flags);
return 0;
}
static int x1000_usb_phy_enable(struct clk_hw *hw)
{
void __iomem *reg_opcr = cgu->base + CGU_REG_OPCR;
void __iomem *reg_usbpcr = cgu->base + CGU_REG_USBPCR;
writel(readl(reg_opcr) | OPCR_SPENDN0, reg_opcr);
writel(readl(reg_usbpcr) & ~USBPCR_OTG_DISABLE & ~USBPCR_SIDDQ, reg_usbpcr);
return 0;
}
static void x1000_usb_phy_disable(struct clk_hw *hw)
{
void __iomem *reg_opcr = cgu->base + CGU_REG_OPCR;
void __iomem *reg_usbpcr = cgu->base + CGU_REG_USBPCR;
writel(readl(reg_opcr) & ~OPCR_SPENDN0, reg_opcr);
writel(readl(reg_usbpcr) | USBPCR_OTG_DISABLE | USBPCR_SIDDQ, reg_usbpcr);
}
static int x1000_usb_phy_is_enabled(struct clk_hw *hw)
{
void __iomem *reg_opcr = cgu->base + CGU_REG_OPCR;
void __iomem *reg_usbpcr = cgu->base + CGU_REG_USBPCR;
return (readl(reg_opcr) & OPCR_SPENDN0) &&
!(readl(reg_usbpcr) & USBPCR_SIDDQ) &&
!(readl(reg_usbpcr) & USBPCR_OTG_DISABLE);
}
static const struct clk_ops x1000_otg_phy_ops = {
.recalc_rate = x1000_otg_phy_recalc_rate,
.round_rate = x1000_otg_phy_round_rate,
.set_rate = x1000_otg_phy_set_rate,
.enable = x1000_usb_phy_enable,
.disable = x1000_usb_phy_disable,
.is_enabled = x1000_usb_phy_is_enabled,
};
static void
x1000_i2spll_calc_m_n_od(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *pm, unsigned int *pn, unsigned int *pod)
{
const unsigned long m_max = GENMASK(pll_info->m_bits - 1, 0);
const unsigned long n_max = GENMASK(pll_info->n_bits - 1, 0);
unsigned long m, n;
rational_best_approximation(rate, parent_rate, m_max, n_max, &m, &n);
/* n should not be less than 2*m */
if (n < 2 * m)
n = 2 * m;
*pm = m;
*pn = n;
*pod = 1;
}
static void
x1000_i2spll_set_rate_hook(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate)
{
/*
* Writing 0 causes I2SCDR1.I2SDIV_D to be automatically recalculated
* based on the current value of I2SCDR.I2SDIV_N, which is needed for
* the divider to function correctly.
*/
writel(0, cgu->base + CGU_REG_I2SCDR1);
}
static const s8 pll_od_encoding[8] = {
0x0, 0x1, -1, 0x2, -1, -1, -1, 0x3,
};
static const struct ingenic_cgu_clk_info x1000_cgu_clocks[] = {
/* External clocks */
[X1000_CLK_EXCLK] = { "ext", CGU_CLK_EXT },
[X1000_CLK_RTCLK] = { "rtc", CGU_CLK_EXT },
/* PLLs */
[X1000_CLK_APLL] = {
"apll", CGU_CLK_PLL,
.parents = { X1000_CLK_EXCLK },
.pll = {
.reg = CGU_REG_APLL,
.rate_multiplier = 1,
.m_shift = 24,
.m_bits = 7,
.m_offset = 1,
.n_shift = 18,
.n_bits = 5,
.n_offset = 1,
.od_shift = 16,
.od_bits = 2,
.od_max = 8,
.od_encoding = pll_od_encoding,
.bypass_reg = CGU_REG_APLL,
.bypass_bit = 9,
.enable_bit = 8,
.stable_bit = 10,
},
},
[X1000_CLK_MPLL] = {
"mpll", CGU_CLK_PLL,
.parents = { X1000_CLK_EXCLK },
.pll = {
.reg = CGU_REG_MPLL,
.rate_multiplier = 1,
.m_shift = 24,
.m_bits = 7,
.m_offset = 1,
.n_shift = 18,
.n_bits = 5,
.n_offset = 1,
.od_shift = 16,
.od_bits = 2,
.od_max = 8,
.od_encoding = pll_od_encoding,
.bypass_reg = CGU_REG_MPLL,
.bypass_bit = 6,
.enable_bit = 7,
.stable_bit = 0,
},
},
/* Custom (SoC-specific) OTG PHY */
[X1000_CLK_OTGPHY] = {
"otg_phy", CGU_CLK_CUSTOM,
.parents = { -1, -1, X1000_CLK_EXCLK, -1 },
.custom = { &x1000_otg_phy_ops },
},
/* Muxes & dividers */
[X1000_CLK_SCLKA] = {
"sclk_a", CGU_CLK_MUX,
.parents = { -1, X1000_CLK_EXCLK, X1000_CLK_APLL, -1 },
.mux = { CGU_REG_CPCCR, 30, 2 },
},
[X1000_CLK_CPUMUX] = {
"cpu_mux", CGU_CLK_MUX,
.parents = { -1, X1000_CLK_SCLKA, X1000_CLK_MPLL, -1 },
.mux = { CGU_REG_CPCCR, 28, 2 },
},
[X1000_CLK_CPU] = {
"cpu", CGU_CLK_DIV | CGU_CLK_GATE,
/*
* Disabling the CPU clock or any parent clocks will hang the
* system; mark it critical.
*/
.flags = CLK_IS_CRITICAL,
.parents = { X1000_CLK_CPUMUX },
.div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
.gate = { CGU_REG_CLKGR, 30 },
},
[X1000_CLK_L2CACHE] = {
"l2cache", CGU_CLK_DIV,
/*
* The L2 cache clock is critical if caches are enabled and
* disabling it or any parent clocks will hang the system.
*/
.flags = CLK_IS_CRITICAL,
.parents = { X1000_CLK_CPUMUX },
.div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
},
[X1000_CLK_AHB0] = {
"ahb0", CGU_CLK_MUX | CGU_CLK_DIV,
.parents = { -1, X1000_CLK_SCLKA, X1000_CLK_MPLL, -1 },
.mux = { CGU_REG_CPCCR, 26, 2 },
.div = { CGU_REG_CPCCR, 8, 1, 4, 21, -1, -1 },
},
[X1000_CLK_AHB2PMUX] = {
"ahb2_apb_mux", CGU_CLK_MUX,
.parents = { -1, X1000_CLK_SCLKA, X1000_CLK_MPLL, -1 },
.mux = { CGU_REG_CPCCR, 24, 2 },
},
[X1000_CLK_AHB2] = {
"ahb2", CGU_CLK_DIV,
.parents = { X1000_CLK_AHB2PMUX },
.div = { CGU_REG_CPCCR, 12, 1, 4, 20, -1, -1 },
},
[X1000_CLK_PCLK] = {
"pclk", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { X1000_CLK_AHB2PMUX },
.div = { CGU_REG_CPCCR, 16, 1, 4, 20, -1, -1 },
.gate = { CGU_REG_CLKGR, 28 },
},
[X1000_CLK_DDR] = {
"ddr", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
/*
* Disabling DDR clock or its parents will render DRAM
* inaccessible; mark it critical.
*/
.flags = CLK_IS_CRITICAL,
.parents = { -1, X1000_CLK_SCLKA, X1000_CLK_MPLL, -1 },
.mux = { CGU_REG_DDRCDR, 30, 2 },
.div = { CGU_REG_DDRCDR, 0, 1, 4, 29, 28, 27 },
.gate = { CGU_REG_CLKGR, 31 },
},
[X1000_CLK_MAC] = {
"mac", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { X1000_CLK_SCLKA, X1000_CLK_MPLL },
.mux = { CGU_REG_MACCDR, 31, 1 },
.div = { CGU_REG_MACCDR, 0, 1, 8, 29, 28, 27 },
.gate = { CGU_REG_CLKGR, 25 },
},
[X1000_CLK_I2SPLLMUX] = {
"i2s_pll_mux", CGU_CLK_MUX,
.parents = { X1000_CLK_SCLKA, X1000_CLK_MPLL },
.mux = { CGU_REG_I2SCDR, 31, 1 },
},
[X1000_CLK_I2SPLL] = {
"i2s_pll", CGU_CLK_PLL,
.parents = { X1000_CLK_I2SPLLMUX },
.pll = {
.reg = CGU_REG_I2SCDR,
.rate_multiplier = 1,
.m_shift = 13,
.m_bits = 9,
.n_shift = 0,
.n_bits = 13,
.calc_m_n_od = x1000_i2spll_calc_m_n_od,
.set_rate_hook = x1000_i2spll_set_rate_hook,
},
},
[X1000_CLK_I2S] = {
"i2s", CGU_CLK_MUX,
.parents = { X1000_CLK_EXCLK, -1, -1, X1000_CLK_I2SPLL },
/*
* NOTE: the mux is at bit 30; bit 29 enables the M/N divider.
* Therefore, the divider is disabled when EXCLK is selected.
*/
.mux = { CGU_REG_I2SCDR, 29, 2 },
},
[X1000_CLK_LCD] = {
"lcd", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { X1000_CLK_SCLKA, X1000_CLK_MPLL },
.mux = { CGU_REG_LPCDR, 31, 1 },
.div = { CGU_REG_LPCDR, 0, 1, 8, 28, 27, 26 },
.gate = { CGU_REG_CLKGR, 23 },
},
[X1000_CLK_MSCMUX] = {
"msc_mux", CGU_CLK_MUX,
.parents = { X1000_CLK_SCLKA, X1000_CLK_MPLL },
.mux = { CGU_REG_MSC0CDR, 31, 1 },
},
[X1000_CLK_MSC0] = {
"msc0", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { X1000_CLK_MSCMUX },
.div = { CGU_REG_MSC0CDR, 0, 2, 8, 29, 28, 27 },
.gate = { CGU_REG_CLKGR, 4 },
},
[X1000_CLK_MSC1] = {
"msc1", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { X1000_CLK_MSCMUX, -1, -1, -1 },
.div = { CGU_REG_MSC1CDR, 0, 2, 8, 29, 28, 27 },
.gate = { CGU_REG_CLKGR, 5 },
},
[X1000_CLK_OTG] = {
"otg", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
.parents = { X1000_CLK_EXCLK, -1, X1000_CLK_APLL, X1000_CLK_MPLL },
.mux = { CGU_REG_USBCDR, 30, 2 },
.div = { CGU_REG_USBCDR, 0, 1, 8, 29, 28, 27 },
.gate = { CGU_REG_CLKGR, 3 },
},
[X1000_CLK_SSIPLL] = {
"ssi_pll", CGU_CLK_MUX | CGU_CLK_DIV,
.parents = { X1000_CLK_SCLKA, X1000_CLK_MPLL },
.mux = { CGU_REG_SSICDR, 31, 1 },
.div = { CGU_REG_SSICDR, 0, 1, 8, 29, 28, 27 },
},
[X1000_CLK_SSIPLL_DIV2] = {
"ssi_pll_div2", CGU_CLK_FIXDIV,
.parents = { X1000_CLK_SSIPLL },
.fixdiv = { 2 },
},
[X1000_CLK_SSIMUX] = {
"ssi_mux", CGU_CLK_MUX,
.parents = { X1000_CLK_EXCLK, X1000_CLK_SSIPLL_DIV2 },
.mux = { CGU_REG_SSICDR, 30, 1 },
},
[X1000_CLK_EXCLK_DIV512] = {
"exclk_div512", CGU_CLK_FIXDIV,
.parents = { X1000_CLK_EXCLK },
.fixdiv = { 512 },
},
[X1000_CLK_RTC] = {
"rtc_ercs", CGU_CLK_MUX | CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK_DIV512, X1000_CLK_RTCLK },
.mux = { CGU_REG_OPCR, 2, 1},
.gate = { CGU_REG_CLKGR, 27 },
},
/* Gate-only clocks */
[X1000_CLK_EMC] = {
"emc", CGU_CLK_GATE,
.parents = { X1000_CLK_AHB2 },
.gate = { CGU_REG_CLKGR, 0 },
},
[X1000_CLK_EFUSE] = {
"efuse", CGU_CLK_GATE,
.parents = { X1000_CLK_AHB2 },
.gate = { CGU_REG_CLKGR, 1 },
},
[X1000_CLK_SFC] = {
"sfc", CGU_CLK_GATE,
.parents = { X1000_CLK_SSIPLL },
.gate = { CGU_REG_CLKGR, 2 },
},
[X1000_CLK_I2C0] = {
"i2c0", CGU_CLK_GATE,
.parents = { X1000_CLK_PCLK },
.gate = { CGU_REG_CLKGR, 7 },
},
[X1000_CLK_I2C1] = {
"i2c1", CGU_CLK_GATE,
.parents = { X1000_CLK_PCLK },
.gate = { CGU_REG_CLKGR, 8 },
},
[X1000_CLK_I2C2] = {
"i2c2", CGU_CLK_GATE,
.parents = { X1000_CLK_PCLK },
.gate = { CGU_REG_CLKGR, 9 },
},
[X1000_CLK_AIC] = {
"aic", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 11 },
},
[X1000_CLK_UART0] = {
"uart0", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 14 },
},
[X1000_CLK_UART1] = {
"uart1", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK},
.gate = { CGU_REG_CLKGR, 15 },
},
[X1000_CLK_UART2] = {
"uart2", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 16 },
},
[X1000_CLK_TCU] = {
"tcu", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 18 },
},
[X1000_CLK_SSI] = {
"ssi", CGU_CLK_GATE,
.parents = { X1000_CLK_SSIMUX },
.gate = { CGU_REG_CLKGR, 19 },
},
[X1000_CLK_OST] = {
"ost", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 20 },
},
[X1000_CLK_PDMA] = {
"pdma", CGU_CLK_GATE,
.parents = { X1000_CLK_EXCLK },
.gate = { CGU_REG_CLKGR, 21 },
},
};
static void __init x1000_cgu_init(struct device_node *np)
{
int retval;
cgu = ingenic_cgu_new(x1000_cgu_clocks,
ARRAY_SIZE(x1000_cgu_clocks), np);
if (!cgu) {
pr_err("%s: failed to initialise CGU\n", __func__);
return;
}
retval = ingenic_cgu_register_clocks(cgu);
if (retval) {
pr_err("%s: failed to register CGU Clocks\n", __func__);
return;
}
ingenic_cgu_register_syscore_ops(cgu);
}
/*
* CGU has some children devices, this is useful for probing children devices
* in the case where the device node is compatible with "simple-mfd".
*/
CLK_OF_DECLARE_DRIVER(x1000_cgu, "ingenic,x1000-cgu", x1000_cgu_init);