diff options
Diffstat (limited to 'drivers/clk/mvebu/armada-37xx-periph.c')
| -rw-r--r-- | drivers/clk/mvebu/armada-37xx-periph.c | 808 |
1 files changed, 808 insertions, 0 deletions
diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c new file mode 100644 index 000000000..e3777ca65 --- /dev/null +++ b/drivers/clk/mvebu/armada-37xx-periph.c @@ -0,0 +1,808 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Marvell Armada 37xx SoC Peripheral clocks + * + * Copyright (C) 2016 Marvell + * + * Gregory CLEMENT <gregory.clement@free-electrons.com> + * + * Most of the peripheral clocks can be modelled like this: + * _____ _______ _______ + * TBG-A-P --| | | | | | ______ + * TBG-B-P --| Mux |--| /div1 |--| /div2 |--| Gate |--> perip_clk + * TBG-A-S --| | | | | | |______| + * TBG-B-S --|_____| |_______| |_______| + * + * However some clocks may use only one or two block or and use the + * xtal clock as parent. + */ + +#include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/mfd/syscon.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/jiffies.h> + +#define TBG_SEL 0x0 +#define DIV_SEL0 0x4 +#define DIV_SEL1 0x8 +#define DIV_SEL2 0xC +#define CLK_SEL 0x10 +#define CLK_DIS 0x14 + +#define ARMADA_37XX_DVFS_LOAD_1 1 +#define LOAD_LEVEL_NR 4 + +#define ARMADA_37XX_NB_L0L1 0x18 +#define ARMADA_37XX_NB_L2L3 0x1C +#define ARMADA_37XX_NB_TBG_DIV_OFF 13 +#define ARMADA_37XX_NB_TBG_DIV_MASK 0x7 +#define ARMADA_37XX_NB_CLK_SEL_OFF 11 +#define ARMADA_37XX_NB_CLK_SEL_MASK 0x1 +#define ARMADA_37XX_NB_TBG_SEL_OFF 9 +#define ARMADA_37XX_NB_TBG_SEL_MASK 0x3 +#define ARMADA_37XX_NB_CONFIG_SHIFT 16 +#define ARMADA_37XX_NB_DYN_MOD 0x24 +#define ARMADA_37XX_NB_DFS_EN 31 +#define ARMADA_37XX_NB_CPU_LOAD 0x30 +#define ARMADA_37XX_NB_CPU_LOAD_MASK 0x3 +#define ARMADA_37XX_DVFS_LOAD_0 0 +#define ARMADA_37XX_DVFS_LOAD_1 1 +#define ARMADA_37XX_DVFS_LOAD_2 2 +#define ARMADA_37XX_DVFS_LOAD_3 3 + +struct clk_periph_driver_data { + struct clk_hw_onecell_data *hw_data; + spinlock_t lock; + void __iomem *reg; + + /* Storage registers for suspend/resume operations */ + u32 tbg_sel; + u32 div_sel0; + u32 div_sel1; + u32 div_sel2; + u32 clk_sel; + u32 clk_dis; +}; + +struct clk_double_div { + struct clk_hw hw; + void __iomem *reg1; + u8 shift1; + void __iomem *reg2; + u8 shift2; +}; + +struct clk_pm_cpu { + struct clk_hw hw; + void __iomem *reg_mux; + u8 shift_mux; + u32 mask_mux; + void __iomem *reg_div; + u8 shift_div; + struct regmap *nb_pm_base; + unsigned long l1_expiration; +}; + +#define to_clk_double_div(_hw) container_of(_hw, struct clk_double_div, hw) +#define to_clk_pm_cpu(_hw) container_of(_hw, struct clk_pm_cpu, hw) + +struct clk_periph_data { + const char *name; + const char * const *parent_names; + int num_parents; + struct clk_hw *mux_hw; + struct clk_hw *rate_hw; + struct clk_hw *gate_hw; + struct clk_hw *muxrate_hw; + bool is_double_div; +}; + +static const struct clk_div_table clk_table6[] = { + { .val = 1, .div = 1, }, + { .val = 2, .div = 2, }, + { .val = 3, .div = 3, }, + { .val = 4, .div = 4, }, + { .val = 5, .div = 5, }, + { .val = 6, .div = 6, }, + { .val = 0, .div = 0, }, /* last entry */ +}; + +static const struct clk_div_table clk_table1[] = { + { .val = 0, .div = 1, }, + { .val = 1, .div = 2, }, + { .val = 0, .div = 0, }, /* last entry */ +}; + +static const struct clk_div_table clk_table2[] = { + { .val = 0, .div = 2, }, + { .val = 1, .div = 4, }, + { .val = 0, .div = 0, }, /* last entry */ +}; + +static const struct clk_ops clk_double_div_ops; +static const struct clk_ops clk_pm_cpu_ops; + +#define PERIPH_GATE(_name, _bit) \ +struct clk_gate gate_##_name = { \ + .reg = (void *)CLK_DIS, \ + .bit_idx = _bit, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_gate_ops, \ + } \ +}; + +#define PERIPH_MUX(_name, _shift) \ +struct clk_mux mux_##_name = { \ + .reg = (void *)TBG_SEL, \ + .shift = _shift, \ + .mask = 3, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_mux_ro_ops, \ + } \ +}; + +#define PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2) \ +struct clk_double_div rate_##_name = { \ + .reg1 = (void *)_reg1, \ + .reg2 = (void *)_reg2, \ + .shift1 = _shift1, \ + .shift2 = _shift2, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_double_div_ops, \ + } \ +}; + +#define PERIPH_DIV(_name, _reg, _shift, _table) \ +struct clk_divider rate_##_name = { \ + .reg = (void *)_reg, \ + .table = _table, \ + .shift = _shift, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_divider_ro_ops, \ + } \ +}; + +#define PERIPH_PM_CPU(_name, _shift1, _reg, _shift2) \ +struct clk_pm_cpu muxrate_##_name = { \ + .reg_mux = (void *)TBG_SEL, \ + .mask_mux = 3, \ + .shift_mux = _shift1, \ + .reg_div = (void *)_reg, \ + .shift_div = _shift2, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_pm_cpu_ops, \ + } \ +}; + +#define PERIPH_CLK_FULL_DD(_name, _bit, _shift, _reg1, _reg2, _shift1, _shift2)\ +static PERIPH_GATE(_name, _bit); \ +static PERIPH_MUX(_name, _shift); \ +static PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2); + +#define PERIPH_CLK_FULL(_name, _bit, _shift, _reg, _shift1, _table) \ +static PERIPH_GATE(_name, _bit); \ +static PERIPH_MUX(_name, _shift); \ +static PERIPH_DIV(_name, _reg, _shift1, _table); + +#define PERIPH_CLK_GATE_DIV(_name, _bit, _reg, _shift, _table) \ +static PERIPH_GATE(_name, _bit); \ +static PERIPH_DIV(_name, _reg, _shift, _table); + +#define PERIPH_CLK_MUX_DD(_name, _shift, _reg1, _reg2, _shift1, _shift2)\ +static PERIPH_MUX(_name, _shift); \ +static PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2); + +#define REF_CLK_FULL(_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ "TBG-A-P", \ + "TBG-B-P", "TBG-A-S", "TBG-B-S"}, \ + .num_parents = 4, \ + .mux_hw = &mux_##_name.hw, \ + .gate_hw = &gate_##_name.hw, \ + .rate_hw = &rate_##_name.hw, \ + } + +#define REF_CLK_FULL_DD(_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ "TBG-A-P", \ + "TBG-B-P", "TBG-A-S", "TBG-B-S"}, \ + .num_parents = 4, \ + .mux_hw = &mux_##_name.hw, \ + .gate_hw = &gate_##_name.hw, \ + .rate_hw = &rate_##_name.hw, \ + .is_double_div = true, \ + } + +#define REF_CLK_GATE(_name, _parent_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ _parent_name}, \ + .num_parents = 1, \ + .gate_hw = &gate_##_name.hw, \ + } + +#define REF_CLK_GATE_DIV(_name, _parent_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ _parent_name}, \ + .num_parents = 1, \ + .gate_hw = &gate_##_name.hw, \ + .rate_hw = &rate_##_name.hw, \ + } + +#define REF_CLK_PM_CPU(_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ "TBG-A-P", \ + "TBG-B-P", "TBG-A-S", "TBG-B-S"}, \ + .num_parents = 4, \ + .muxrate_hw = &muxrate_##_name.hw, \ + } + +#define REF_CLK_MUX_DD(_name) \ + { .name = #_name, \ + .parent_names = (const char *[]){ "TBG-A-P", \ + "TBG-B-P", "TBG-A-S", "TBG-B-S"}, \ + .num_parents = 4, \ + .mux_hw = &mux_##_name.hw, \ + .rate_hw = &rate_##_name.hw, \ + .is_double_div = true, \ + } + +/* NB periph clocks */ +PERIPH_CLK_FULL_DD(mmc, 2, 0, DIV_SEL2, DIV_SEL2, 16, 13); +PERIPH_CLK_FULL_DD(sata_host, 3, 2, DIV_SEL2, DIV_SEL2, 10, 7); +PERIPH_CLK_FULL_DD(sec_at, 6, 4, DIV_SEL1, DIV_SEL1, 3, 0); +PERIPH_CLK_FULL_DD(sec_dap, 7, 6, DIV_SEL1, DIV_SEL1, 9, 6); +PERIPH_CLK_FULL_DD(tscem, 8, 8, DIV_SEL1, DIV_SEL1, 15, 12); +PERIPH_CLK_FULL(tscem_tmx, 10, 10, DIV_SEL1, 18, clk_table6); +static PERIPH_GATE(avs, 11); +PERIPH_CLK_FULL_DD(pwm, 13, 14, DIV_SEL0, DIV_SEL0, 3, 0); +PERIPH_CLK_FULL_DD(sqf, 12, 12, DIV_SEL1, DIV_SEL1, 27, 24); +static PERIPH_GATE(i2c_2, 16); +static PERIPH_GATE(i2c_1, 17); +PERIPH_CLK_GATE_DIV(ddr_phy, 19, DIV_SEL0, 18, clk_table2); +PERIPH_CLK_FULL_DD(ddr_fclk, 21, 16, DIV_SEL0, DIV_SEL0, 15, 12); +PERIPH_CLK_FULL(trace, 22, 18, DIV_SEL0, 20, clk_table6); +PERIPH_CLK_FULL(counter, 23, 20, DIV_SEL0, 23, clk_table6); +PERIPH_CLK_FULL_DD(eip97, 24, 24, DIV_SEL2, DIV_SEL2, 22, 19); +static PERIPH_PM_CPU(cpu, 22, DIV_SEL0, 28); + +static struct clk_periph_data data_nb[] = { + REF_CLK_FULL_DD(mmc), + REF_CLK_FULL_DD(sata_host), + REF_CLK_FULL_DD(sec_at), + REF_CLK_FULL_DD(sec_dap), + REF_CLK_FULL_DD(tscem), + REF_CLK_FULL(tscem_tmx), + REF_CLK_GATE(avs, "xtal"), + REF_CLK_FULL_DD(sqf), + REF_CLK_FULL_DD(pwm), + REF_CLK_GATE(i2c_2, "xtal"), + REF_CLK_GATE(i2c_1, "xtal"), + REF_CLK_GATE_DIV(ddr_phy, "TBG-A-S"), + REF_CLK_FULL_DD(ddr_fclk), + REF_CLK_FULL(trace), + REF_CLK_FULL(counter), + REF_CLK_FULL_DD(eip97), + REF_CLK_PM_CPU(cpu), + { }, +}; + +/* SB periph clocks */ +PERIPH_CLK_MUX_DD(gbe_50, 6, DIV_SEL2, DIV_SEL2, 6, 9); +PERIPH_CLK_MUX_DD(gbe_core, 8, DIV_SEL1, DIV_SEL1, 18, 21); +PERIPH_CLK_MUX_DD(gbe_125, 10, DIV_SEL1, DIV_SEL1, 6, 9); +static PERIPH_GATE(gbe1_50, 0); +static PERIPH_GATE(gbe0_50, 1); +static PERIPH_GATE(gbe1_125, 2); +static PERIPH_GATE(gbe0_125, 3); +PERIPH_CLK_GATE_DIV(gbe1_core, 4, DIV_SEL1, 13, clk_table1); +PERIPH_CLK_GATE_DIV(gbe0_core, 5, DIV_SEL1, 14, clk_table1); +PERIPH_CLK_GATE_DIV(gbe_bm, 12, DIV_SEL1, 0, clk_table1); +PERIPH_CLK_FULL_DD(sdio, 11, 14, DIV_SEL0, DIV_SEL0, 3, 6); +PERIPH_CLK_FULL_DD(usb32_usb2_sys, 16, 16, DIV_SEL0, DIV_SEL0, 9, 12); +PERIPH_CLK_FULL_DD(usb32_ss_sys, 17, 18, DIV_SEL0, DIV_SEL0, 15, 18); +static PERIPH_GATE(pcie, 14); + +static struct clk_periph_data data_sb[] = { + REF_CLK_MUX_DD(gbe_50), + REF_CLK_MUX_DD(gbe_core), + REF_CLK_MUX_DD(gbe_125), + REF_CLK_GATE(gbe1_50, "gbe_50"), + REF_CLK_GATE(gbe0_50, "gbe_50"), + REF_CLK_GATE(gbe1_125, "gbe_125"), + REF_CLK_GATE(gbe0_125, "gbe_125"), + REF_CLK_GATE_DIV(gbe1_core, "gbe_core"), + REF_CLK_GATE_DIV(gbe0_core, "gbe_core"), + REF_CLK_GATE_DIV(gbe_bm, "gbe_core"), + REF_CLK_FULL_DD(sdio), + REF_CLK_FULL_DD(usb32_usb2_sys), + REF_CLK_FULL_DD(usb32_ss_sys), + REF_CLK_GATE(pcie, "gbe_core"), + { }, +}; + +static unsigned int get_div(void __iomem *reg, int shift) +{ + u32 val; + + val = (readl(reg) >> shift) & 0x7; + if (val > 6) + return 0; + return val; +} + +static unsigned long clk_double_div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_double_div *double_div = to_clk_double_div(hw); + unsigned int div; + + div = get_div(double_div->reg1, double_div->shift1); + div *= get_div(double_div->reg2, double_div->shift2); + + return DIV_ROUND_UP_ULL((u64)parent_rate, div); +} + +static const struct clk_ops clk_double_div_ops = { + .recalc_rate = clk_double_div_recalc_rate, +}; + +static void armada_3700_pm_dvfs_update_regs(unsigned int load_level, + unsigned int *reg, + unsigned int *offset) +{ + if (load_level <= ARMADA_37XX_DVFS_LOAD_1) + *reg = ARMADA_37XX_NB_L0L1; + else + *reg = ARMADA_37XX_NB_L2L3; + + if (load_level == ARMADA_37XX_DVFS_LOAD_0 || + load_level == ARMADA_37XX_DVFS_LOAD_2) + *offset += ARMADA_37XX_NB_CONFIG_SHIFT; +} + +static bool armada_3700_pm_dvfs_is_enabled(struct regmap *base) +{ + unsigned int val, reg = ARMADA_37XX_NB_DYN_MOD; + + if (IS_ERR(base)) + return false; + + regmap_read(base, reg, &val); + + return !!(val & BIT(ARMADA_37XX_NB_DFS_EN)); +} + +static unsigned int armada_3700_pm_dvfs_get_cpu_div(struct regmap *base) +{ + unsigned int reg = ARMADA_37XX_NB_CPU_LOAD; + unsigned int offset = ARMADA_37XX_NB_TBG_DIV_OFF; + unsigned int load_level, div; + + /* + * This function is always called after the function + * armada_3700_pm_dvfs_is_enabled, so no need to check again + * if the base is valid. + */ + regmap_read(base, reg, &load_level); + + /* + * The register and the offset inside this register accessed to + * read the current divider depend on the load level + */ + load_level &= ARMADA_37XX_NB_CPU_LOAD_MASK; + armada_3700_pm_dvfs_update_regs(load_level, ®, &offset); + + regmap_read(base, reg, &div); + + return (div >> offset) & ARMADA_37XX_NB_TBG_DIV_MASK; +} + +static unsigned int armada_3700_pm_dvfs_get_cpu_parent(struct regmap *base) +{ + unsigned int reg = ARMADA_37XX_NB_CPU_LOAD; + unsigned int offset = ARMADA_37XX_NB_TBG_SEL_OFF; + unsigned int load_level, sel; + + /* + * This function is always called after the function + * armada_3700_pm_dvfs_is_enabled, so no need to check again + * if the base is valid + */ + regmap_read(base, reg, &load_level); + + /* + * The register and the offset inside this register accessed to + * read the current divider depend on the load level + */ + load_level &= ARMADA_37XX_NB_CPU_LOAD_MASK; + armada_3700_pm_dvfs_update_regs(load_level, ®, &offset); + + regmap_read(base, reg, &sel); + + return (sel >> offset) & ARMADA_37XX_NB_TBG_SEL_MASK; +} + +static u8 clk_pm_cpu_get_parent(struct clk_hw *hw) +{ + struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw); + u32 val; + + if (armada_3700_pm_dvfs_is_enabled(pm_cpu->nb_pm_base)) { + val = armada_3700_pm_dvfs_get_cpu_parent(pm_cpu->nb_pm_base); + } else { + val = readl(pm_cpu->reg_mux) >> pm_cpu->shift_mux; + val &= pm_cpu->mask_mux; + } + + return val; +} + +static unsigned long clk_pm_cpu_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw); + unsigned int div; + + if (armada_3700_pm_dvfs_is_enabled(pm_cpu->nb_pm_base)) + div = armada_3700_pm_dvfs_get_cpu_div(pm_cpu->nb_pm_base); + else + div = get_div(pm_cpu->reg_div, pm_cpu->shift_div); + return DIV_ROUND_UP_ULL((u64)parent_rate, div); +} + +static long clk_pm_cpu_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw); + struct regmap *base = pm_cpu->nb_pm_base; + unsigned int div = *parent_rate / rate; + unsigned int load_level; + /* only available when DVFS is enabled */ + if (!armada_3700_pm_dvfs_is_enabled(base)) + return -EINVAL; + + for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) { + unsigned int reg, val, offset = ARMADA_37XX_NB_TBG_DIV_OFF; + + armada_3700_pm_dvfs_update_regs(load_level, ®, &offset); + + regmap_read(base, reg, &val); + + val >>= offset; + val &= ARMADA_37XX_NB_TBG_DIV_MASK; + if (val == div) + /* + * We found a load level matching the target + * divider, switch to this load level and + * return. + */ + return *parent_rate / div; + } + + /* We didn't find any valid divider */ + return -EINVAL; +} + +/* + * Workaround when base CPU frequnecy is 1000 or 1200 MHz + * + * Switching the CPU from the L2 or L3 frequencies (250/300 or 200 MHz + * respectively) to L0 frequency (1/1.2 GHz) requires a significant + * amount of time to let VDD stabilize to the appropriate + * voltage. This amount of time is large enough that it cannot be + * covered by the hardware countdown register. Due to this, the CPU + * might start operating at L0 before the voltage is stabilized, + * leading to CPU stalls. + * + * To work around this problem, we prevent switching directly from the + * L2/L3 frequencies to the L0 frequency, and instead switch to the L1 + * frequency in-between. The sequence therefore becomes: + * 1. First switch from L2/L3 (200/250/300 MHz) to L1 (500/600 MHz) + * 2. Sleep 20ms for stabling VDD voltage + * 3. Then switch from L1 (500/600 MHz) to L0 (1000/1200 MHz). + */ +static void clk_pm_cpu_set_rate_wa(struct clk_pm_cpu *pm_cpu, + unsigned int new_level, unsigned long rate, + struct regmap *base) +{ + unsigned int cur_level; + + regmap_read(base, ARMADA_37XX_NB_CPU_LOAD, &cur_level); + cur_level &= ARMADA_37XX_NB_CPU_LOAD_MASK; + + if (cur_level == new_level) + return; + + /* + * System wants to go to L1 on its own. If we are going from L2/L3, + * remember when 20ms will expire. If from L0, set the value so that + * next switch to L0 won't have to wait. + */ + if (new_level == ARMADA_37XX_DVFS_LOAD_1) { + if (cur_level == ARMADA_37XX_DVFS_LOAD_0) + pm_cpu->l1_expiration = jiffies; + else + pm_cpu->l1_expiration = jiffies + msecs_to_jiffies(20); + return; + } + + /* + * If we are setting to L2/L3, just invalidate L1 expiration time, + * sleeping is not needed. + */ + if (rate < 1000*1000*1000) + goto invalidate_l1_exp; + + /* + * We are going to L0 with rate >= 1GHz. Check whether we have been at + * L1 for long enough time. If not, go to L1 for 20ms. + */ + if (pm_cpu->l1_expiration && time_is_before_eq_jiffies(pm_cpu->l1_expiration)) + goto invalidate_l1_exp; + + regmap_update_bits(base, ARMADA_37XX_NB_CPU_LOAD, + ARMADA_37XX_NB_CPU_LOAD_MASK, + ARMADA_37XX_DVFS_LOAD_1); + msleep(20); + +invalidate_l1_exp: + pm_cpu->l1_expiration = 0; +} + +static int clk_pm_cpu_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw); + struct regmap *base = pm_cpu->nb_pm_base; + unsigned int div = parent_rate / rate; + unsigned int load_level; + + /* only available when DVFS is enabled */ + if (!armada_3700_pm_dvfs_is_enabled(base)) + return -EINVAL; + + for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) { + unsigned int reg, mask, val, + offset = ARMADA_37XX_NB_TBG_DIV_OFF; + + armada_3700_pm_dvfs_update_regs(load_level, ®, &offset); + + regmap_read(base, reg, &val); + val >>= offset; + val &= ARMADA_37XX_NB_TBG_DIV_MASK; + + if (val == div) { + /* + * We found a load level matching the target + * divider, switch to this load level and + * return. + */ + reg = ARMADA_37XX_NB_CPU_LOAD; + mask = ARMADA_37XX_NB_CPU_LOAD_MASK; + + /* Apply workaround when base CPU frequency is 1000 or 1200 MHz */ + if (parent_rate >= 1000*1000*1000) + clk_pm_cpu_set_rate_wa(pm_cpu, load_level, rate, base); + + regmap_update_bits(base, reg, mask, load_level); + + return rate; + } + } + + /* We didn't find any valid divider */ + return -EINVAL; +} + +static const struct clk_ops clk_pm_cpu_ops = { + .get_parent = clk_pm_cpu_get_parent, + .round_rate = clk_pm_cpu_round_rate, + .set_rate = clk_pm_cpu_set_rate, + .recalc_rate = clk_pm_cpu_recalc_rate, +}; + +static const struct of_device_id armada_3700_periph_clock_of_match[] = { + { .compatible = "marvell,armada-3700-periph-clock-nb", + .data = data_nb, }, + { .compatible = "marvell,armada-3700-periph-clock-sb", + .data = data_sb, }, + { } +}; + +static int armada_3700_add_composite_clk(const struct clk_periph_data *data, + void __iomem *reg, spinlock_t *lock, + struct device *dev, struct clk_hw **hw) +{ + const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, + *rate_ops = NULL; + struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *rate_hw = NULL; + + if (data->mux_hw) { + struct clk_mux *mux; + + mux_hw = data->mux_hw; + mux = to_clk_mux(mux_hw); + mux->lock = lock; + mux_ops = mux_hw->init->ops; + mux->reg = reg + (u64)mux->reg; + } + + if (data->gate_hw) { + struct clk_gate *gate; + + gate_hw = data->gate_hw; + gate = to_clk_gate(gate_hw); + gate->lock = lock; + gate_ops = gate_hw->init->ops; + gate->reg = reg + (u64)gate->reg; + gate->flags = CLK_GATE_SET_TO_DISABLE; + } + + if (data->rate_hw) { + rate_hw = data->rate_hw; + rate_ops = rate_hw->init->ops; + if (data->is_double_div) { + struct clk_double_div *rate; + + rate = to_clk_double_div(rate_hw); + rate->reg1 = reg + (u64)rate->reg1; + rate->reg2 = reg + (u64)rate->reg2; + } else { + struct clk_divider *rate = to_clk_divider(rate_hw); + const struct clk_div_table *clkt; + int table_size = 0; + + rate->reg = reg + (u64)rate->reg; + for (clkt = rate->table; clkt->div; clkt++) + table_size++; + rate->width = order_base_2(table_size); + rate->lock = lock; + } + } + + if (data->muxrate_hw) { + struct clk_pm_cpu *pmcpu_clk; + struct clk_hw *muxrate_hw = data->muxrate_hw; + struct regmap *map; + + pmcpu_clk = to_clk_pm_cpu(muxrate_hw); + pmcpu_clk->reg_mux = reg + (u64)pmcpu_clk->reg_mux; + pmcpu_clk->reg_div = reg + (u64)pmcpu_clk->reg_div; + + mux_hw = muxrate_hw; + rate_hw = muxrate_hw; + mux_ops = muxrate_hw->init->ops; + rate_ops = muxrate_hw->init->ops; + + map = syscon_regmap_lookup_by_compatible( + "marvell,armada-3700-nb-pm"); + pmcpu_clk->nb_pm_base = map; + } + + *hw = clk_hw_register_composite(dev, data->name, data->parent_names, + data->num_parents, mux_hw, + mux_ops, rate_hw, rate_ops, + gate_hw, gate_ops, CLK_IGNORE_UNUSED); + + return PTR_ERR_OR_ZERO(*hw); +} + +static int __maybe_unused armada_3700_periph_clock_suspend(struct device *dev) +{ + struct clk_periph_driver_data *data = dev_get_drvdata(dev); + + data->tbg_sel = readl(data->reg + TBG_SEL); + data->div_sel0 = readl(data->reg + DIV_SEL0); + data->div_sel1 = readl(data->reg + DIV_SEL1); + data->div_sel2 = readl(data->reg + DIV_SEL2); + data->clk_sel = readl(data->reg + CLK_SEL); + data->clk_dis = readl(data->reg + CLK_DIS); + + return 0; +} + +static int __maybe_unused armada_3700_periph_clock_resume(struct device *dev) +{ + struct clk_periph_driver_data *data = dev_get_drvdata(dev); + + /* Follow the same order than what the Cortex-M3 does (ATF code) */ + writel(data->clk_dis, data->reg + CLK_DIS); + writel(data->div_sel0, data->reg + DIV_SEL0); + writel(data->div_sel1, data->reg + DIV_SEL1); + writel(data->div_sel2, data->reg + DIV_SEL2); + writel(data->tbg_sel, data->reg + TBG_SEL); + writel(data->clk_sel, data->reg + CLK_SEL); + + return 0; +} + +static const struct dev_pm_ops armada_3700_periph_clock_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(armada_3700_periph_clock_suspend, + armada_3700_periph_clock_resume) +}; + +static int armada_3700_periph_clock_probe(struct platform_device *pdev) +{ + struct clk_periph_driver_data *driver_data; + struct device_node *np = pdev->dev.of_node; + const struct clk_periph_data *data; + struct device *dev = &pdev->dev; + int num_periph = 0, i, ret; + struct resource *res; + + data = of_device_get_match_data(dev); + if (!data) + return -ENODEV; + + while (data[num_periph].name) + num_periph++; + + driver_data = devm_kzalloc(dev, sizeof(*driver_data), GFP_KERNEL); + if (!driver_data) + return -ENOMEM; + + driver_data->hw_data = devm_kzalloc(dev, + struct_size(driver_data->hw_data, + hws, num_periph), + GFP_KERNEL); + if (!driver_data->hw_data) + return -ENOMEM; + driver_data->hw_data->num = num_periph; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + driver_data->reg = devm_ioremap_resource(dev, res); + if (IS_ERR(driver_data->reg)) + return PTR_ERR(driver_data->reg); + + spin_lock_init(&driver_data->lock); + + for (i = 0; i < num_periph; i++) { + struct clk_hw **hw = &driver_data->hw_data->hws[i]; + if (armada_3700_add_composite_clk(&data[i], driver_data->reg, + &driver_data->lock, dev, hw)) + dev_err(dev, "Can't register periph clock %s\n", + data[i].name); + } + + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, + driver_data->hw_data); + if (ret) { + for (i = 0; i < num_periph; i++) + clk_hw_unregister(driver_data->hw_data->hws[i]); + return ret; + } + + platform_set_drvdata(pdev, driver_data); + return 0; +} + +static int armada_3700_periph_clock_remove(struct platform_device *pdev) +{ + struct clk_periph_driver_data *data = platform_get_drvdata(pdev); + struct clk_hw_onecell_data *hw_data = data->hw_data; + int i; + + of_clk_del_provider(pdev->dev.of_node); + + for (i = 0; i < hw_data->num; i++) + clk_hw_unregister(hw_data->hws[i]); + + return 0; +} + +static struct platform_driver armada_3700_periph_clock_driver = { + .probe = armada_3700_periph_clock_probe, + .remove = armada_3700_periph_clock_remove, + .driver = { + .name = "marvell-armada-3700-periph-clock", + .of_match_table = armada_3700_periph_clock_of_match, + .pm = &armada_3700_periph_clock_pm_ops, + }, +}; + +builtin_platform_driver(armada_3700_periph_clock_driver); |