diff options
Diffstat (limited to 'drivers/mfd/rz-mtu3.c')
| -rw-r--r-- | drivers/mfd/rz-mtu3.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/mfd/rz-mtu3.c b/drivers/mfd/rz-mtu3.c new file mode 100644 index 0000000000..f3dac4a29a --- /dev/null +++ b/drivers/mfd/rz-mtu3.c @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RZ/G2L Multi-Function Timer Pulse Unit 3(MTU3a) Core driver + * + * Copyright (C) 2023 Renesas Electronics Corporation + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/mfd/core.h> +#include <linux/mfd/rz-mtu3.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/spinlock.h> + +#include "rz-mtu3.h" + +struct rz_mtu3_priv { + void __iomem *mmio; + struct reset_control *rstc; + spinlock_t lock; +}; + +/******* MTU3 registers (original offset is +0x1200) *******/ +static const unsigned long rz_mtu3_8bit_ch_reg_offs[][13] = { + [RZ_MTU3_CHAN_0] = MTU_8BIT_CH_0(0x104, 0x090, 0x100, 0x128, 0x101, 0x102, 0x103, 0x126), + [RZ_MTU3_CHAN_1] = MTU_8BIT_CH_1_2(0x184, 0x091, 0x185, 0x180, 0x194, 0x181, 0x182), + [RZ_MTU3_CHAN_2] = MTU_8BIT_CH_1_2(0x204, 0x092, 0x205, 0x200, 0x20c, 0x201, 0x202), + [RZ_MTU3_CHAN_3] = MTU_8BIT_CH_3_4_6_7(0x008, 0x093, 0x02c, 0x000, 0x04c, 0x002, 0x004, 0x005, 0x038), + [RZ_MTU3_CHAN_4] = MTU_8BIT_CH_3_4_6_7(0x009, 0x094, 0x02d, 0x001, 0x04d, 0x003, 0x006, 0x007, 0x039), + [RZ_MTU3_CHAN_5] = MTU_8BIT_CH_5(0xab2, 0x1eb, 0xab4, 0xab6, 0xa84, 0xa85, 0xa86, 0xa94, 0xa95, 0xa96, 0xaa4, 0xaa5, 0xaa6), + [RZ_MTU3_CHAN_6] = MTU_8BIT_CH_3_4_6_7(0x808, 0x893, 0x82c, 0x800, 0x84c, 0x802, 0x804, 0x805, 0x838), + [RZ_MTU3_CHAN_7] = MTU_8BIT_CH_3_4_6_7(0x809, 0x894, 0x82d, 0x801, 0x84d, 0x803, 0x806, 0x807, 0x839), + [RZ_MTU3_CHAN_8] = MTU_8BIT_CH_8(0x404, 0x098, 0x400, 0x406, 0x401, 0x402, 0x403) +}; + +static const unsigned long rz_mtu3_16bit_ch_reg_offs[][12] = { + [RZ_MTU3_CHAN_0] = MTU_16BIT_CH_0(0x106, 0x108, 0x10a, 0x10c, 0x10e, 0x120, 0x122), + [RZ_MTU3_CHAN_1] = MTU_16BIT_CH_1_2(0x186, 0x188, 0x18a), + [RZ_MTU3_CHAN_2] = MTU_16BIT_CH_1_2(0x206, 0x208, 0x20a), + [RZ_MTU3_CHAN_3] = MTU_16BIT_CH_3_6(0x010, 0x018, 0x01a, 0x024, 0x026, 0x072), + [RZ_MTU3_CHAN_4] = MTU_16BIT_CH_4_7(0x012, 0x01c, 0x01e, 0x028, 0x2a, 0x074, 0x076, 0x040, 0x044, 0x046, 0x048, 0x04a), + [RZ_MTU3_CHAN_5] = MTU_16BIT_CH_5(0xa80, 0xa82, 0xa90, 0xa92, 0xaa0, 0xaa2), + [RZ_MTU3_CHAN_6] = MTU_16BIT_CH_3_6(0x810, 0x818, 0x81a, 0x824, 0x826, 0x872), + [RZ_MTU3_CHAN_7] = MTU_16BIT_CH_4_7(0x812, 0x81c, 0x81e, 0x828, 0x82a, 0x874, 0x876, 0x840, 0x844, 0x846, 0x848, 0x84a) +}; + +static const unsigned long rz_mtu3_32bit_ch_reg_offs[][5] = { + [RZ_MTU3_CHAN_1] = MTU_32BIT_CH_1(0x1a0, 0x1a4, 0x1a8), + [RZ_MTU3_CHAN_8] = MTU_32BIT_CH_8(0x408, 0x40c, 0x410, 0x414, 0x418) +}; + +static bool rz_mtu3_is_16bit_shared_reg(u16 offset) +{ + return (offset == RZ_MTU3_TDDRA || offset == RZ_MTU3_TDDRB || + offset == RZ_MTU3_TCDRA || offset == RZ_MTU3_TCDRB || + offset == RZ_MTU3_TCBRA || offset == RZ_MTU3_TCBRB || + offset == RZ_MTU3_TCNTSA || offset == RZ_MTU3_TCNTSB); +} + +u16 rz_mtu3_shared_reg_read(struct rz_mtu3_channel *ch, u16 offset) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + + if (rz_mtu3_is_16bit_shared_reg(offset)) + return readw(priv->mmio + offset); + else + return readb(priv->mmio + offset); +} +EXPORT_SYMBOL_GPL(rz_mtu3_shared_reg_read); + +u8 rz_mtu3_8bit_ch_read(struct rz_mtu3_channel *ch, u16 offset) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + ch_offs = rz_mtu3_8bit_ch_reg_offs[ch->channel_number][offset]; + + return readb(priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_8bit_ch_read); + +u16 rz_mtu3_16bit_ch_read(struct rz_mtu3_channel *ch, u16 offset) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + /* MTU8 doesn't have 16-bit registers */ + if (ch->channel_number == RZ_MTU3_CHAN_8) + return 0; + + ch_offs = rz_mtu3_16bit_ch_reg_offs[ch->channel_number][offset]; + + return readw(priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_16bit_ch_read); + +u32 rz_mtu3_32bit_ch_read(struct rz_mtu3_channel *ch, u16 offset) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + if (ch->channel_number != RZ_MTU3_CHAN_1 && ch->channel_number != RZ_MTU3_CHAN_8) + return 0; + + ch_offs = rz_mtu3_32bit_ch_reg_offs[ch->channel_number][offset]; + + return readl(priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_32bit_ch_read); + +void rz_mtu3_8bit_ch_write(struct rz_mtu3_channel *ch, u16 offset, u8 val) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + ch_offs = rz_mtu3_8bit_ch_reg_offs[ch->channel_number][offset]; + writeb(val, priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_8bit_ch_write); + +void rz_mtu3_16bit_ch_write(struct rz_mtu3_channel *ch, u16 offset, u16 val) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + /* MTU8 doesn't have 16-bit registers */ + if (ch->channel_number == RZ_MTU3_CHAN_8) + return; + + ch_offs = rz_mtu3_16bit_ch_reg_offs[ch->channel_number][offset]; + writew(val, priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_16bit_ch_write); + +void rz_mtu3_32bit_ch_write(struct rz_mtu3_channel *ch, u16 offset, u32 val) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + u16 ch_offs; + + if (ch->channel_number != RZ_MTU3_CHAN_1 && ch->channel_number != RZ_MTU3_CHAN_8) + return; + + ch_offs = rz_mtu3_32bit_ch_reg_offs[ch->channel_number][offset]; + writel(val, priv->mmio + ch_offs); +} +EXPORT_SYMBOL_GPL(rz_mtu3_32bit_ch_write); + +void rz_mtu3_shared_reg_write(struct rz_mtu3_channel *ch, u16 offset, u16 value) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + + if (rz_mtu3_is_16bit_shared_reg(offset)) + writew(value, priv->mmio + offset); + else + writeb((u8)value, priv->mmio + offset); +} +EXPORT_SYMBOL_GPL(rz_mtu3_shared_reg_write); + +void rz_mtu3_shared_reg_update_bit(struct rz_mtu3_channel *ch, u16 offset, + u16 pos, u8 val) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + unsigned long tmdr, flags; + + spin_lock_irqsave(&priv->lock, flags); + tmdr = rz_mtu3_shared_reg_read(ch, offset); + __assign_bit(pos, &tmdr, !!val); + rz_mtu3_shared_reg_write(ch, offset, tmdr); + spin_unlock_irqrestore(&priv->lock, flags); +} +EXPORT_SYMBOL_GPL(rz_mtu3_shared_reg_update_bit); + +static u16 rz_mtu3_get_tstr_offset(struct rz_mtu3_channel *ch) +{ + u16 offset; + + switch (ch->channel_number) { + case RZ_MTU3_CHAN_0: + case RZ_MTU3_CHAN_1: + case RZ_MTU3_CHAN_2: + case RZ_MTU3_CHAN_3: + case RZ_MTU3_CHAN_4: + case RZ_MTU3_CHAN_8: + offset = RZ_MTU3_TSTRA; + break; + case RZ_MTU3_CHAN_5: + offset = RZ_MTU3_TSTR; + break; + case RZ_MTU3_CHAN_6: + case RZ_MTU3_CHAN_7: + offset = RZ_MTU3_TSTRB; + break; + default: + offset = 0; + break; + } + + return offset; +} + +static u8 rz_mtu3_get_tstr_bit_pos(struct rz_mtu3_channel *ch) +{ + u8 bitpos; + + switch (ch->channel_number) { + case RZ_MTU3_CHAN_0: + case RZ_MTU3_CHAN_1: + case RZ_MTU3_CHAN_2: + case RZ_MTU3_CHAN_6: + case RZ_MTU3_CHAN_7: + bitpos = ch->channel_number; + break; + case RZ_MTU3_CHAN_3: + bitpos = 6; + break; + case RZ_MTU3_CHAN_4: + bitpos = 7; + break; + case RZ_MTU3_CHAN_5: + bitpos = 2; + break; + case RZ_MTU3_CHAN_8: + bitpos = 3; + break; + default: + bitpos = 0; + break; + } + + return bitpos; +} + +static void rz_mtu3_start_stop_ch(struct rz_mtu3_channel *ch, bool start) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + unsigned long flags, tstr; + u16 offset; + u8 bitpos; + + offset = rz_mtu3_get_tstr_offset(ch); + bitpos = rz_mtu3_get_tstr_bit_pos(ch); + + /* start stop register shared by multiple timer channels */ + spin_lock_irqsave(&priv->lock, flags); + + tstr = rz_mtu3_shared_reg_read(ch, offset); + __assign_bit(bitpos, &tstr, start); + rz_mtu3_shared_reg_write(ch, offset, tstr); + + spin_unlock_irqrestore(&priv->lock, flags); +} + +bool rz_mtu3_is_enabled(struct rz_mtu3_channel *ch) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(ch->dev->parent); + struct rz_mtu3_priv *priv = mtu->priv_data; + unsigned long flags, tstr; + u16 offset; + u8 bitpos; + + offset = rz_mtu3_get_tstr_offset(ch); + bitpos = rz_mtu3_get_tstr_bit_pos(ch); + + /* start stop register shared by multiple timer channels */ + spin_lock_irqsave(&priv->lock, flags); + tstr = rz_mtu3_shared_reg_read(ch, offset); + spin_unlock_irqrestore(&priv->lock, flags); + + return tstr & BIT(bitpos); +} +EXPORT_SYMBOL_GPL(rz_mtu3_is_enabled); + +int rz_mtu3_enable(struct rz_mtu3_channel *ch) +{ + /* enable channel */ + rz_mtu3_start_stop_ch(ch, true); + + return 0; +} +EXPORT_SYMBOL_GPL(rz_mtu3_enable); + +void rz_mtu3_disable(struct rz_mtu3_channel *ch) +{ + /* disable channel */ + rz_mtu3_start_stop_ch(ch, false); +} +EXPORT_SYMBOL_GPL(rz_mtu3_disable); + +static void rz_mtu3_reset_assert(void *data) +{ + struct rz_mtu3 *mtu = dev_get_drvdata(data); + struct rz_mtu3_priv *priv = mtu->priv_data; + + mfd_remove_devices(data); + reset_control_assert(priv->rstc); +} + +static const struct mfd_cell rz_mtu3_devs[] = { + { + .name = "rz-mtu3-counter", + }, + { + .name = "pwm-rz-mtu3", + }, +}; + +static int rz_mtu3_probe(struct platform_device *pdev) +{ + struct rz_mtu3_priv *priv; + struct rz_mtu3 *ddata; + unsigned int i; + int ret; + + ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + ddata->priv_data = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!ddata->priv_data) + return -ENOMEM; + + priv = ddata->priv_data; + + priv->mmio = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->mmio)) + return PTR_ERR(priv->mmio); + + priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(priv->rstc)) + return PTR_ERR(priv->rstc); + + ddata->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(ddata->clk)) + return PTR_ERR(ddata->clk); + + reset_control_deassert(priv->rstc); + spin_lock_init(&priv->lock); + platform_set_drvdata(pdev, ddata); + + for (i = 0; i < RZ_MTU_NUM_CHANNELS; i++) { + ddata->channels[i].channel_number = i; + ddata->channels[i].is_busy = false; + mutex_init(&ddata->channels[i].lock); + } + + ret = mfd_add_devices(&pdev->dev, 0, rz_mtu3_devs, + ARRAY_SIZE(rz_mtu3_devs), NULL, 0, NULL); + if (ret < 0) + goto err_assert; + + return devm_add_action_or_reset(&pdev->dev, rz_mtu3_reset_assert, + &pdev->dev); + +err_assert: + reset_control_assert(priv->rstc); + return ret; +} + +static const struct of_device_id rz_mtu3_of_match[] = { + { .compatible = "renesas,rz-mtu3", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rz_mtu3_of_match); + +static struct platform_driver rz_mtu3_driver = { + .probe = rz_mtu3_probe, + .driver = { + .name = "rz-mtu3", + .of_match_table = rz_mtu3_of_match, + }, +}; +module_platform_driver(rz_mtu3_driver); + +MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>"); +MODULE_DESCRIPTION("Renesas RZ/G2L MTU3a Core Driver"); +MODULE_LICENSE("GPL"); |