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linux/drivers/clk/ralink/clk-mtmips.c
Sergio Paracuellos 6191023134 clk: ralink: mtmips: quiet unused variable warning 
When CONFIG_OF is disabled then the matching table is not referenced and
the following warning appears:

drivers/clk/ralink/clk-mtmips.c:821:34: warning: unused variable 'mtmips_of_match' [-Wunused-const-variable]
821 |   static const struct of_device_id mtmips_of_match[] = {
    |                          ^

There are two match tables in the driver: one for the clock driver and the
other for the reset driver. The only difference between them is that the
clock driver uses 'data' and does not have 'ralink,rt2880-reset' compatible.
Both just can be merged into a single one just by adding the compatible
'ralink,rt2880-reset' entry to 'mtmips_of_match[]', which will allow it to
be used for 'mtmips_clk_driver' (which doesn't use the data) as well as for
'mtmips_clk_init()' (which doesn't need get called for 'ralink,rt2880-reset').

Doing in this way ensures that 'CONFIG_OF' is not disabled anymore so the
above warning disapears.

Fixes: 6f3b15586e ("clk: ralink: add clock and reset driver for MTMIPS SoCs")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307242310.CdOnd2py-lkp@intel.com/
Suggested-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20230827023932.501102-1-sergio.paracuellos@gmail.com
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2023-10-18 17:31:44 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* MTMIPS SoCs Clock Driver
* Author: Sergio Paracuellos <sergio.paracuellos@gmail.com>
*/
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
/* Configuration registers */
#define SYSC_REG_SYSTEM_CONFIG 0x10
#define SYSC_REG_CLKCFG0 0x2c
#define SYSC_REG_RESET_CTRL 0x34
#define SYSC_REG_CPU_SYS_CLKCFG 0x3c
#define SYSC_REG_CPLL_CONFIG0 0x54
#define SYSC_REG_CPLL_CONFIG1 0x58
/* RT2880 SoC */
#define RT2880_CONFIG_CPUCLK_SHIFT 20
#define RT2880_CONFIG_CPUCLK_MASK 0x3
#define RT2880_CONFIG_CPUCLK_250 0x0
#define RT2880_CONFIG_CPUCLK_266 0x1
#define RT2880_CONFIG_CPUCLK_280 0x2
#define RT2880_CONFIG_CPUCLK_300 0x3
/* RT305X SoC */
#define RT305X_SYSCFG_CPUCLK_SHIFT 18
#define RT305X_SYSCFG_CPUCLK_MASK 0x1
#define RT305X_SYSCFG_CPUCLK_LOW 0x0
#define RT305X_SYSCFG_CPUCLK_HIGH 0x1
/* RT3352 SoC */
#define RT3352_SYSCFG0_CPUCLK_SHIFT 8
#define RT3352_SYSCFG0_CPUCLK_MASK 0x1
#define RT3352_SYSCFG0_CPUCLK_LOW 0x0
#define RT3352_SYSCFG0_CPUCLK_HIGH 0x1
/* RT3383 SoC */
#define RT3883_SYSCFG0_DRAM_TYPE_DDR2 BIT(17)
#define RT3883_SYSCFG0_CPUCLK_SHIFT 8
#define RT3883_SYSCFG0_CPUCLK_MASK 0x3
#define RT3883_SYSCFG0_CPUCLK_250 0x0
#define RT3883_SYSCFG0_CPUCLK_384 0x1
#define RT3883_SYSCFG0_CPUCLK_480 0x2
#define RT3883_SYSCFG0_CPUCLK_500 0x3
/* RT5350 SoC */
#define RT5350_CLKCFG0_XTAL_SEL BIT(20)
#define RT5350_SYSCFG0_CPUCLK_SHIFT 8
#define RT5350_SYSCFG0_CPUCLK_MASK 0x3
#define RT5350_SYSCFG0_CPUCLK_360 0x0
#define RT5350_SYSCFG0_CPUCLK_320 0x2
#define RT5350_SYSCFG0_CPUCLK_300 0x3
/* MT7620 and MT76x8 SoCs */
#define MT7620_XTAL_FREQ_SEL BIT(6)
#define CPLL_CFG0_SW_CFG BIT(31)
#define CPLL_CFG0_PLL_MULT_RATIO_SHIFT 16
#define CPLL_CFG0_PLL_MULT_RATIO_MASK 0x7
#define CPLL_CFG0_LC_CURFCK BIT(15)
#define CPLL_CFG0_BYPASS_REF_CLK BIT(14)
#define CPLL_CFG0_PLL_DIV_RATIO_SHIFT 10
#define CPLL_CFG0_PLL_DIV_RATIO_MASK 0x3
#define CPLL_CFG1_CPU_AUX1 BIT(25)
#define CPLL_CFG1_CPU_AUX0 BIT(24)
#define CLKCFG0_PERI_CLK_SEL BIT(4)
#define CPU_SYS_CLKCFG_OCP_RATIO_SHIFT 16
#define CPU_SYS_CLKCFG_OCP_RATIO_MASK 0xf
#define CPU_SYS_CLKCFG_OCP_RATIO_1 0 /* 1:1 (Reserved) */
#define CPU_SYS_CLKCFG_OCP_RATIO_1_5 1 /* 1:1.5 (Reserved) */
#define CPU_SYS_CLKCFG_OCP_RATIO_2 2 /* 1:2 */
#define CPU_SYS_CLKCFG_OCP_RATIO_2_5 3 /* 1:2.5 (Reserved) */
#define CPU_SYS_CLKCFG_OCP_RATIO_3 4 /* 1:3 */
#define CPU_SYS_CLKCFG_OCP_RATIO_3_5 5 /* 1:3.5 (Reserved) */
#define CPU_SYS_CLKCFG_OCP_RATIO_4 6 /* 1:4 */
#define CPU_SYS_CLKCFG_OCP_RATIO_5 7 /* 1:5 */
#define CPU_SYS_CLKCFG_OCP_RATIO_10 8 /* 1:10 */
#define CPU_SYS_CLKCFG_CPU_FDIV_SHIFT 8
#define CPU_SYS_CLKCFG_CPU_FDIV_MASK 0x1f
#define CPU_SYS_CLKCFG_CPU_FFRAC_SHIFT 0
#define CPU_SYS_CLKCFG_CPU_FFRAC_MASK 0x1f
/* clock scaling */
#define CLKCFG_FDIV_MASK 0x1f00
#define CLKCFG_FDIV_USB_VAL 0x0300
#define CLKCFG_FFRAC_MASK 0x001f
#define CLKCFG_FFRAC_USB_VAL 0x0003
struct mtmips_clk;
struct mtmips_clk_fixed;
struct mtmips_clk_factor;
struct mtmips_clk_data {
struct mtmips_clk *clk_base;
size_t num_clk_base;
struct mtmips_clk_fixed *clk_fixed;
size_t num_clk_fixed;
struct mtmips_clk_factor *clk_factor;
size_t num_clk_factor;
struct mtmips_clk *clk_periph;
size_t num_clk_periph;
};
struct mtmips_clk_priv {
struct regmap *sysc;
const struct mtmips_clk_data *data;
};
struct mtmips_clk {
struct clk_hw hw;
struct mtmips_clk_priv *priv;
};
struct mtmips_clk_fixed {
const char *name;
const char *parent;
unsigned long rate;
struct clk_hw *hw;
};
struct mtmips_clk_factor {
const char *name;
const char *parent;
int mult;
int div;
unsigned long flags;
struct clk_hw *hw;
};
static unsigned long mtmips_pherip_clk_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return parent_rate;
}
static const struct clk_ops mtmips_periph_clk_ops = {
.recalc_rate = mtmips_pherip_clk_rate,
};
#define CLK_PERIPH(_name, _parent) { \
.init = &(const struct clk_init_data) { \
.name = _name, \
.ops = &mtmips_periph_clk_ops, \
.parent_data = &(const struct clk_parent_data) {\
.name = _parent, \
.fw_name = _parent \
}, \
.num_parents = 1, \
/* \
* There are drivers for these SoCs that are \
* older than clock driver and are not prepared \
* for the clock. We don't want the kernel to \
* disable anything so we add CLK_IS_CRITICAL \
* flag here. \
*/ \
.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL \
}, \
}
static struct mtmips_clk rt2880_pherip_clks[] = {
{ CLK_PERIPH("300100.timer", "bus") },
{ CLK_PERIPH("300120.watchdog", "bus") },
{ CLK_PERIPH("300500.uart", "bus") },
{ CLK_PERIPH("300900.i2c", "bus") },
{ CLK_PERIPH("300c00.uartlite", "bus") },
{ CLK_PERIPH("400000.ethernet", "bus") },
{ CLK_PERIPH("480000.wmac", "xtal") }
};
static struct mtmips_clk rt305x_pherip_clks[] = {
{ CLK_PERIPH("10000100.timer", "bus") },
{ CLK_PERIPH("10000120.watchdog", "bus") },
{ CLK_PERIPH("10000500.uart", "bus") },
{ CLK_PERIPH("10000900.i2c", "bus") },
{ CLK_PERIPH("10000a00.i2s", "bus") },
{ CLK_PERIPH("10000b00.spi", "bus") },
{ CLK_PERIPH("10000b40.spi", "bus") },
{ CLK_PERIPH("10000c00.uartlite", "bus") },
{ CLK_PERIPH("10100000.ethernet", "bus") },
{ CLK_PERIPH("10180000.wmac", "xtal") }
};
static struct mtmips_clk rt5350_pherip_clks[] = {
{ CLK_PERIPH("10000100.timer", "bus") },
{ CLK_PERIPH("10000120.watchdog", "bus") },
{ CLK_PERIPH("10000500.uart", "periph") },
{ CLK_PERIPH("10000900.i2c", "periph") },
{ CLK_PERIPH("10000a00.i2s", "periph") },
{ CLK_PERIPH("10000b00.spi", "bus") },
{ CLK_PERIPH("10000b40.spi", "bus") },
{ CLK_PERIPH("10000c00.uartlite", "periph") },
{ CLK_PERIPH("10100000.ethernet", "bus") },
{ CLK_PERIPH("10180000.wmac", "xtal") }
};
static struct mtmips_clk mt7620_pherip_clks[] = {
{ CLK_PERIPH("10000100.timer", "periph") },
{ CLK_PERIPH("10000120.watchdog", "periph") },
{ CLK_PERIPH("10000500.uart", "periph") },
{ CLK_PERIPH("10000900.i2c", "periph") },
{ CLK_PERIPH("10000a00.i2s", "periph") },
{ CLK_PERIPH("10000b00.spi", "bus") },
{ CLK_PERIPH("10000b40.spi", "bus") },
{ CLK_PERIPH("10000c00.uartlite", "periph") },
{ CLK_PERIPH("10180000.wmac", "xtal") }
};
static struct mtmips_clk mt76x8_pherip_clks[] = {
{ CLK_PERIPH("10000100.timer", "periph") },
{ CLK_PERIPH("10000120.watchdog", "periph") },
{ CLK_PERIPH("10000900.i2c", "periph") },
{ CLK_PERIPH("10000a00.i2s", "pcmi2s") },
{ CLK_PERIPH("10000b00.spi", "bus") },
{ CLK_PERIPH("10000b40.spi", "bus") },
{ CLK_PERIPH("10000c00.uart0", "periph") },
{ CLK_PERIPH("10000d00.uart1", "periph") },
{ CLK_PERIPH("10000e00.uart2", "periph") },
{ CLK_PERIPH("10300000.wmac", "xtal") }
};
static int mtmips_register_pherip_clocks(struct device_node *np,
struct clk_hw_onecell_data *clk_data,
struct mtmips_clk_priv *priv)
{
struct clk_hw **hws = clk_data->hws;
struct mtmips_clk *sclk;
size_t idx_start = priv->data->num_clk_base + priv->data->num_clk_fixed +
priv->data->num_clk_factor;
int ret, i;
for (i = 0; i < priv->data->num_clk_periph; i++) {
int idx = idx_start + i;
sclk = &priv->data->clk_periph[i];
ret = of_clk_hw_register(np, &sclk->hw);
if (ret) {
pr_err("Couldn't register peripheral clock %d\n", idx);
goto err_clk_unreg;
}
hws[idx] = &sclk->hw;
}
return 0;
err_clk_unreg:
while (--i >= 0) {
sclk = &priv->data->clk_periph[i];
clk_hw_unregister(&sclk->hw);
}
return ret;
}
#define CLK_FIXED(_name, _parent, _rate) \
{ \
.name = _name, \
.parent = _parent, \
.rate = _rate \
}
static struct mtmips_clk_fixed rt305x_fixed_clocks[] = {
CLK_FIXED("xtal", NULL, 40000000)
};
static struct mtmips_clk_fixed rt3352_fixed_clocks[] = {
CLK_FIXED("periph", "xtal", 40000000)
};
static struct mtmips_clk_fixed mt76x8_fixed_clocks[] = {
CLK_FIXED("pcmi2s", "xtal", 480000000),
CLK_FIXED("periph", "xtal", 40000000)
};
static int mtmips_register_fixed_clocks(struct clk_hw_onecell_data *clk_data,
struct mtmips_clk_priv *priv)
{
struct clk_hw **hws = clk_data->hws;
struct mtmips_clk_fixed *sclk;
size_t idx_start = priv->data->num_clk_base;
int ret, i;
for (i = 0; i < priv->data->num_clk_fixed; i++) {
int idx = idx_start + i;
sclk = &priv->data->clk_fixed[i];
sclk->hw = clk_hw_register_fixed_rate(NULL, sclk->name,
sclk->parent, 0,
sclk->rate);
if (IS_ERR(sclk->hw)) {
ret = PTR_ERR(sclk->hw);
pr_err("Couldn't register fixed clock %d\n", idx);
goto err_clk_unreg;
}
hws[idx] = sclk->hw;
}
return 0;
err_clk_unreg:
while (--i >= 0) {
sclk = &priv->data->clk_fixed[i];
clk_hw_unregister_fixed_rate(sclk->hw);
}
return ret;
}
#define CLK_FACTOR(_name, _parent, _mult, _div) \
{ \
.name = _name, \
.parent = _parent, \
.mult = _mult, \
.div = _div, \
.flags = CLK_SET_RATE_PARENT \
}
static struct mtmips_clk_factor rt2880_factor_clocks[] = {
CLK_FACTOR("bus", "cpu", 1, 2)
};
static struct mtmips_clk_factor rt305x_factor_clocks[] = {
CLK_FACTOR("bus", "cpu", 1, 3)
};
static int mtmips_register_factor_clocks(struct clk_hw_onecell_data *clk_data,
struct mtmips_clk_priv *priv)
{
struct clk_hw **hws = clk_data->hws;
struct mtmips_clk_factor *sclk;
size_t idx_start = priv->data->num_clk_base + priv->data->num_clk_fixed;
int ret, i;
for (i = 0; i < priv->data->num_clk_factor; i++) {
int idx = idx_start + i;
sclk = &priv->data->clk_factor[i];
sclk->hw = clk_hw_register_fixed_factor(NULL, sclk->name,
sclk->parent, sclk->flags,
sclk->mult, sclk->div);
if (IS_ERR(sclk->hw)) {
ret = PTR_ERR(sclk->hw);
pr_err("Couldn't register factor clock %d\n", idx);
goto err_clk_unreg;
}
hws[idx] = sclk->hw;
}
return 0;
err_clk_unreg:
while (--i >= 0) {
sclk = &priv->data->clk_factor[i];
clk_hw_unregister_fixed_factor(sclk->hw);
}
return ret;
}
static inline struct mtmips_clk *to_mtmips_clk(struct clk_hw *hw)
{
return container_of(hw, struct mtmips_clk, hw);
}
static unsigned long rt5350_xtal_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 val;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &val);
if (!(val & RT5350_CLKCFG0_XTAL_SEL))
return 20000000;
return 40000000;
}
static unsigned long rt5350_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
t = (t >> RT5350_SYSCFG0_CPUCLK_SHIFT) & RT5350_SYSCFG0_CPUCLK_MASK;
switch (t) {
case RT5350_SYSCFG0_CPUCLK_360:
return 360000000;
case RT5350_SYSCFG0_CPUCLK_320:
return 320000000;
case RT5350_SYSCFG0_CPUCLK_300:
return 300000000;
default:
BUG();
}
}
static unsigned long rt5350_bus_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
if (parent_rate == 320000000)
return parent_rate / 4;
return parent_rate / 3;
}
static unsigned long rt3352_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
t = (t >> RT3352_SYSCFG0_CPUCLK_SHIFT) & RT3352_SYSCFG0_CPUCLK_MASK;
switch (t) {
case RT3352_SYSCFG0_CPUCLK_LOW:
return 384000000;
case RT3352_SYSCFG0_CPUCLK_HIGH:
return 400000000;
default:
BUG();
}
}
static unsigned long rt305x_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
t = (t >> RT305X_SYSCFG_CPUCLK_SHIFT) & RT305X_SYSCFG_CPUCLK_MASK;
switch (t) {
case RT305X_SYSCFG_CPUCLK_LOW:
return 320000000;
case RT305X_SYSCFG_CPUCLK_HIGH:
return 384000000;
default:
BUG();
}
}
static unsigned long rt3883_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
t = (t >> RT3883_SYSCFG0_CPUCLK_SHIFT) & RT3883_SYSCFG0_CPUCLK_MASK;
switch (t) {
case RT3883_SYSCFG0_CPUCLK_250:
return 250000000;
case RT3883_SYSCFG0_CPUCLK_384:
return 384000000;
case RT3883_SYSCFG0_CPUCLK_480:
return 480000000;
case RT3883_SYSCFG0_CPUCLK_500:
return 500000000;
default:
BUG();
}
}
static unsigned long rt3883_bus_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 ddr2;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
ddr2 = t & RT3883_SYSCFG0_DRAM_TYPE_DDR2;
switch (parent_rate) {
case 250000000:
return (ddr2) ? 125000000 : 83000000;
case 384000000:
return (ddr2) ? 128000000 : 96000000;
case 480000000:
return (ddr2) ? 160000000 : 120000000;
case 500000000:
return (ddr2) ? 166000000 : 125000000;
default:
WARN_ON_ONCE(parent_rate == 0);
return parent_rate / 4;
}
}
static unsigned long rt2880_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
t = (t >> RT2880_CONFIG_CPUCLK_SHIFT) & RT2880_CONFIG_CPUCLK_MASK;
switch (t) {
case RT2880_CONFIG_CPUCLK_250:
return 250000000;
case RT2880_CONFIG_CPUCLK_266:
return 266000000;
case RT2880_CONFIG_CPUCLK_280:
return 280000000;
case RT2880_CONFIG_CPUCLK_300:
return 300000000;
default:
BUG();
}
}
static u32 mt7620_calc_rate(u32 ref_rate, u32 mul, u32 div)
{
u64 t;
t = ref_rate;
t *= mul;
t = div_u64(t, div);
return t;
}
static unsigned long mt7620_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
static const u32 clk_divider[] = { 2, 3, 4, 8 };
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
unsigned long cpu_pll;
u32 t;
u32 mul;
u32 div;
regmap_read(sysc, SYSC_REG_CPLL_CONFIG0, &t);
if (t & CPLL_CFG0_BYPASS_REF_CLK) {
cpu_pll = parent_rate;
} else if ((t & CPLL_CFG0_SW_CFG) == 0) {
cpu_pll = 600000000;
} else {
mul = (t >> CPLL_CFG0_PLL_MULT_RATIO_SHIFT) &
CPLL_CFG0_PLL_MULT_RATIO_MASK;
mul += 24;
if (t & CPLL_CFG0_LC_CURFCK)
mul *= 2;
div = (t >> CPLL_CFG0_PLL_DIV_RATIO_SHIFT) &
CPLL_CFG0_PLL_DIV_RATIO_MASK;
WARN_ON_ONCE(div >= ARRAY_SIZE(clk_divider));
cpu_pll = mt7620_calc_rate(parent_rate, mul, clk_divider[div]);
}
regmap_read(sysc, SYSC_REG_CPLL_CONFIG1, &t);
if (t & CPLL_CFG1_CPU_AUX1)
return parent_rate;
if (t & CPLL_CFG1_CPU_AUX0)
return 480000000;
return cpu_pll;
}
static unsigned long mt7620_cpu_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
u32 mul;
u32 div;
regmap_read(sysc, SYSC_REG_CPU_SYS_CLKCFG, &t);
mul = t & CPU_SYS_CLKCFG_CPU_FFRAC_MASK;
div = (t >> CPU_SYS_CLKCFG_CPU_FDIV_SHIFT) &
CPU_SYS_CLKCFG_CPU_FDIV_MASK;
return mt7620_calc_rate(parent_rate, mul, div);
}
static unsigned long mt7620_bus_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
static const u32 ocp_dividers[16] = {
[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,
};
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
u32 ocp_ratio;
u32 div;
regmap_read(sysc, SYSC_REG_CPU_SYS_CLKCFG, &t);
ocp_ratio = (t >> CPU_SYS_CLKCFG_OCP_RATIO_SHIFT) &
CPU_SYS_CLKCFG_OCP_RATIO_MASK;
if (WARN_ON_ONCE(ocp_ratio >= ARRAY_SIZE(ocp_dividers)))
return parent_rate;
div = ocp_dividers[ocp_ratio];
if (WARN(!div, "invalid divider for OCP ratio %u", ocp_ratio))
return parent_rate;
return parent_rate / div;
}
static unsigned long mt7620_periph_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_CLKCFG0, &t);
if (t & CLKCFG0_PERI_CLK_SEL)
return parent_rate;
return 40000000;
}
static unsigned long mt76x8_xtal_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtmips_clk *clk = to_mtmips_clk(hw);
struct regmap *sysc = clk->priv->sysc;
u32 t;
regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG, &t);
if (t & MT7620_XTAL_FREQ_SEL)
return 40000000;
return 20000000;
}
static unsigned long mt76x8_cpu_recalc_rate(struct clk_hw *hw,
unsigned long xtal_clk)
{
if (xtal_clk == 40000000)
return 580000000;
return 575000000;
}
#define CLK_BASE(_name, _parent, _recalc) { \
.init = &(const struct clk_init_data) { \
.name = _name, \
.ops = &(const struct clk_ops) { \
.recalc_rate = _recalc, \
}, \
.parent_data = &(const struct clk_parent_data) { \
.name = _parent, \
.fw_name = _parent \
}, \
.num_parents = _parent ? 1 : 0 \
}, \
}
static struct mtmips_clk rt2880_clks_base[] = {
{ CLK_BASE("cpu", "xtal", rt2880_cpu_recalc_rate) }
};
static struct mtmips_clk rt305x_clks_base[] = {
{ CLK_BASE("cpu", "xtal", rt305x_cpu_recalc_rate) }
};
static struct mtmips_clk rt3352_clks_base[] = {
{ CLK_BASE("xtal", NULL, rt5350_xtal_recalc_rate) },
{ CLK_BASE("cpu", "xtal", rt3352_cpu_recalc_rate) }
};
static struct mtmips_clk rt3883_clks_base[] = {
{ CLK_BASE("cpu", "xtal", rt3883_cpu_recalc_rate) },
{ CLK_BASE("bus", "cpu", rt3883_bus_recalc_rate) }
};
static struct mtmips_clk rt5350_clks_base[] = {
{ CLK_BASE("xtal", NULL, rt5350_xtal_recalc_rate) },
{ CLK_BASE("cpu", "xtal", rt5350_cpu_recalc_rate) },
{ CLK_BASE("bus", "cpu", rt5350_bus_recalc_rate) }
};
static struct mtmips_clk mt7620_clks_base[] = {
{ CLK_BASE("xtal", NULL, mt76x8_xtal_recalc_rate) },
{ CLK_BASE("pll", "xtal", mt7620_pll_recalc_rate) },
{ CLK_BASE("cpu", "pll", mt7620_cpu_recalc_rate) },
{ CLK_BASE("periph", "xtal", mt7620_periph_recalc_rate) },
{ CLK_BASE("bus", "cpu", mt7620_bus_recalc_rate) }
};
static struct mtmips_clk mt76x8_clks_base[] = {
{ CLK_BASE("xtal", NULL, mt76x8_xtal_recalc_rate) },
{ CLK_BASE("cpu", "xtal", mt76x8_cpu_recalc_rate) }
};
static int mtmips_register_clocks(struct device_node *np,
struct clk_hw_onecell_data *clk_data,
struct mtmips_clk_priv *priv)
{
struct clk_hw **hws = clk_data->hws;
struct mtmips_clk *sclk;
int ret, i;
for (i = 0; i < priv->data->num_clk_base; i++) {
sclk = &priv->data->clk_base[i];
sclk->priv = priv;
ret = of_clk_hw_register(np, &sclk->hw);
if (ret) {
pr_err("Couldn't register top clock %i\n", i);
goto err_clk_unreg;
}
hws[i] = &sclk->hw;
}
return 0;
err_clk_unreg:
while (--i >= 0) {
sclk = &priv->data->clk_base[i];
clk_hw_unregister(&sclk->hw);
}
return ret;
}
static const struct mtmips_clk_data rt2880_clk_data = {
.clk_base = rt2880_clks_base,
.num_clk_base = ARRAY_SIZE(rt2880_clks_base),
.clk_fixed = rt305x_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(rt305x_fixed_clocks),
.clk_factor = rt2880_factor_clocks,
.num_clk_factor = ARRAY_SIZE(rt2880_factor_clocks),
.clk_periph = rt2880_pherip_clks,
.num_clk_periph = ARRAY_SIZE(rt2880_pherip_clks),
};
static const struct mtmips_clk_data rt305x_clk_data = {
.clk_base = rt305x_clks_base,
.num_clk_base = ARRAY_SIZE(rt305x_clks_base),
.clk_fixed = rt305x_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(rt305x_fixed_clocks),
.clk_factor = rt305x_factor_clocks,
.num_clk_factor = ARRAY_SIZE(rt305x_factor_clocks),
.clk_periph = rt305x_pherip_clks,
.num_clk_periph = ARRAY_SIZE(rt305x_pherip_clks),
};
static const struct mtmips_clk_data rt3352_clk_data = {
.clk_base = rt3352_clks_base,
.num_clk_base = ARRAY_SIZE(rt3352_clks_base),
.clk_fixed = rt3352_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(rt3352_fixed_clocks),
.clk_factor = rt305x_factor_clocks,
.num_clk_factor = ARRAY_SIZE(rt305x_factor_clocks),
.clk_periph = rt5350_pherip_clks,
.num_clk_periph = ARRAY_SIZE(rt5350_pherip_clks),
};
static const struct mtmips_clk_data rt3883_clk_data = {
.clk_base = rt3883_clks_base,
.num_clk_base = ARRAY_SIZE(rt3883_clks_base),
.clk_fixed = rt305x_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(rt305x_fixed_clocks),
.clk_factor = NULL,
.num_clk_factor = 0,
.clk_periph = rt5350_pherip_clks,
.num_clk_periph = ARRAY_SIZE(rt5350_pherip_clks),
};
static const struct mtmips_clk_data rt5350_clk_data = {
.clk_base = rt5350_clks_base,
.num_clk_base = ARRAY_SIZE(rt5350_clks_base),
.clk_fixed = rt3352_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(rt3352_fixed_clocks),
.clk_factor = NULL,
.num_clk_factor = 0,
.clk_periph = rt5350_pherip_clks,
.num_clk_periph = ARRAY_SIZE(rt5350_pherip_clks),
};
static const struct mtmips_clk_data mt7620_clk_data = {
.clk_base = mt7620_clks_base,
.num_clk_base = ARRAY_SIZE(mt7620_clks_base),
.clk_fixed = NULL,
.num_clk_fixed = 0,
.clk_factor = NULL,
.num_clk_factor = 0,
.clk_periph = mt7620_pherip_clks,
.num_clk_periph = ARRAY_SIZE(mt7620_pherip_clks),
};
static const struct mtmips_clk_data mt76x8_clk_data = {
.clk_base = mt76x8_clks_base,
.num_clk_base = ARRAY_SIZE(mt76x8_clks_base),
.clk_fixed = mt76x8_fixed_clocks,
.num_clk_fixed = ARRAY_SIZE(mt76x8_fixed_clocks),
.clk_factor = rt305x_factor_clocks,
.num_clk_factor = ARRAY_SIZE(rt305x_factor_clocks),
.clk_periph = mt76x8_pherip_clks,
.num_clk_periph = ARRAY_SIZE(mt76x8_pherip_clks),
};
static const struct of_device_id mtmips_of_match[] = {
{
.compatible = "ralink,rt2880-reset",
.data = NULL,
},
{
.compatible = "ralink,rt2880-sysc",
.data = &rt2880_clk_data,
},
{
.compatible = "ralink,rt3050-sysc",
.data = &rt305x_clk_data,
},
{
.compatible = "ralink,rt3052-sysc",
.data = &rt305x_clk_data,
},
{
.compatible = "ralink,rt3352-sysc",
.data = &rt3352_clk_data,
},
{
.compatible = "ralink,rt3883-sysc",
.data = &rt3883_clk_data,
},
{
.compatible = "ralink,rt5350-sysc",
.data = &rt5350_clk_data,
},
{
.compatible = "ralink,mt7620-sysc",
.data = &mt7620_clk_data,
},
{
.compatible = "ralink,mt7628-sysc",
.data = &mt76x8_clk_data,
},
{
.compatible = "ralink,mt7688-sysc",
.data = &mt76x8_clk_data,
},
{}
};
static void __init mtmips_clk_regs_init(struct device_node *node,
struct mtmips_clk_priv *priv)
{
u32 t;
if (!of_device_is_compatible(node, "ralink,mt7620-sysc"))
return;
/*
* 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
*/
regmap_read(priv->sysc, SYSC_REG_CPU_SYS_CLKCFG, &t);
t &= ~(CLKCFG_FDIV_MASK | CLKCFG_FFRAC_MASK);
t |= CLKCFG_FDIV_USB_VAL | CLKCFG_FFRAC_USB_VAL;
regmap_write(priv->sysc, SYSC_REG_CPU_SYS_CLKCFG, t);
}
static void __init mtmips_clk_init(struct device_node *node)
{
const struct of_device_id *match;
const struct mtmips_clk_data *data;
struct mtmips_clk_priv *priv;
struct clk_hw_onecell_data *clk_data;
int ret, i, count;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return;
priv->sysc = syscon_node_to_regmap(node);
if (IS_ERR(priv->sysc)) {
pr_err("Could not get sysc syscon regmap\n");
goto free_clk_priv;
}
mtmips_clk_regs_init(node, priv);
match = of_match_node(mtmips_of_match, node);
if (WARN_ON(!match))
return;
data = match->data;
priv->data = data;
count = priv->data->num_clk_base + priv->data->num_clk_fixed +
priv->data->num_clk_factor + priv->data->num_clk_periph;
clk_data = kzalloc(struct_size(clk_data, hws, count), GFP_KERNEL);
if (!clk_data)
goto free_clk_priv;
ret = mtmips_register_clocks(node, clk_data, priv);
if (ret) {
pr_err("Couldn't register top clocks\n");
goto free_clk_data;
}
ret = mtmips_register_fixed_clocks(clk_data, priv);
if (ret) {
pr_err("Couldn't register fixed clocks\n");
goto unreg_clk_top;
}
ret = mtmips_register_factor_clocks(clk_data, priv);
if (ret) {
pr_err("Couldn't register factor clocks\n");
goto unreg_clk_fixed;
}
ret = mtmips_register_pherip_clocks(node, clk_data, priv);
if (ret) {
pr_err("Couldn't register peripheral clocks\n");
goto unreg_clk_factor;
}
clk_data->num = count;
ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
if (ret) {
pr_err("Couldn't add clk hw provider\n");
goto unreg_clk_periph;
}
return;
unreg_clk_periph:
for (i = 0; i < priv->data->num_clk_periph; i++) {
struct mtmips_clk *sclk = &priv->data->clk_periph[i];
clk_hw_unregister(&sclk->hw);
}
unreg_clk_factor:
for (i = 0; i < priv->data->num_clk_factor; i++) {
struct mtmips_clk_factor *sclk = &priv->data->clk_factor[i];
clk_hw_unregister_fixed_factor(sclk->hw);
}
unreg_clk_fixed:
for (i = 0; i < priv->data->num_clk_fixed; i++) {
struct mtmips_clk_fixed *sclk = &priv->data->clk_fixed[i];
clk_hw_unregister_fixed_rate(sclk->hw);
}
unreg_clk_top:
for (i = 0; i < priv->data->num_clk_base; i++) {
struct mtmips_clk *sclk = &priv->data->clk_base[i];
clk_hw_unregister(&sclk->hw);
}
free_clk_data:
kfree(clk_data);
free_clk_priv:
kfree(priv);
}
CLK_OF_DECLARE_DRIVER(rt2880_clk, "ralink,rt2880-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(rt3050_clk, "ralink,rt3050-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(rt3052_clk, "ralink,rt3052-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(rt3352_clk, "ralink,rt3352-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(rt3883_clk, "ralink,rt3883-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(rt5350_clk, "ralink,rt5350-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(mt7620_clk, "ralink,mt7620-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(mt7628_clk, "ralink,mt7628-sysc", mtmips_clk_init);
CLK_OF_DECLARE_DRIVER(mt7688_clk, "ralink,mt7688-sysc", mtmips_clk_init);
struct mtmips_rst {
struct reset_controller_dev rcdev;
struct regmap *sysc;
};
static struct mtmips_rst *to_mtmips_rst(struct reset_controller_dev *dev)
{
return container_of(dev, struct mtmips_rst, rcdev);
}
static int mtmips_assert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct mtmips_rst *data = to_mtmips_rst(rcdev);
struct regmap *sysc = data->sysc;
return regmap_update_bits(sysc, SYSC_REG_RESET_CTRL, BIT(id), BIT(id));
}
static int mtmips_deassert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct mtmips_rst *data = to_mtmips_rst(rcdev);
struct regmap *sysc = data->sysc;
return regmap_update_bits(sysc, SYSC_REG_RESET_CTRL, BIT(id), 0);
}
static int mtmips_reset_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
int ret;
ret = mtmips_assert_device(rcdev, id);
if (ret < 0)
return ret;
return mtmips_deassert_device(rcdev, id);
}
static int mtmips_rst_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
unsigned long id = reset_spec->args[0];
if (id == 0 || id >= rcdev->nr_resets)
return -EINVAL;
return id;
}
static const struct reset_control_ops reset_ops = {
.reset = mtmips_reset_device,
.assert = mtmips_assert_device,
.deassert = mtmips_deassert_device
};
static int mtmips_reset_init(struct device *dev, struct regmap *sysc)
{
struct mtmips_rst *rst_data;
rst_data = devm_kzalloc(dev, sizeof(*rst_data), GFP_KERNEL);
if (!rst_data)
return -ENOMEM;
rst_data->sysc = sysc;
rst_data->rcdev.ops = &reset_ops;
rst_data->rcdev.owner = THIS_MODULE;
rst_data->rcdev.nr_resets = 32;
rst_data->rcdev.of_reset_n_cells = 1;
rst_data->rcdev.of_xlate = mtmips_rst_xlate;
rst_data->rcdev.of_node = dev_of_node(dev);
return devm_reset_controller_register(dev, &rst_data->rcdev);
}
static int mtmips_clk_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct mtmips_clk_priv *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->sysc = syscon_node_to_regmap(np);
if (IS_ERR(priv->sysc))
return dev_err_probe(dev, PTR_ERR(priv->sysc),
"Could not get sysc syscon regmap\n");
ret = mtmips_reset_init(dev, priv->sysc);
if (ret)
return dev_err_probe(dev, ret, "Could not init reset controller\n");
return 0;
}
static struct platform_driver mtmips_clk_driver = {
.probe = mtmips_clk_probe,
.driver = {
.name = "mtmips-clk",
.of_match_table = mtmips_of_match,
},
};
static int __init mtmips_clk_reset_init(void)
{
return platform_driver_register(&mtmips_clk_driver);
}
arch_initcall(mtmips_clk_reset_init);
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