diff options
Diffstat (limited to 'drivers/i3c/master/svc-i3c-master.c')
| -rw-r--r-- | drivers/i3c/master/svc-i3c-master.c | 1725 |
1 files changed, 1725 insertions, 0 deletions
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c new file mode 100644 index 0000000000..c395e52294 --- /dev/null +++ b/drivers/i3c/master/svc-i3c-master.c @@ -0,0 +1,1725 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Silvaco dual-role I3C master driver + * + * Copyright (C) 2020 Silvaco + * Author: Miquel RAYNAL <miquel.raynal@bootlin.com> + * Based on a work from: Conor Culhane <conor.culhane@silvaco.com> + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/errno.h> +#include <linux/i3c/master.h> +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +/* Master Mode Registers */ +#define SVC_I3C_MCONFIG 0x000 +#define SVC_I3C_MCONFIG_MASTER_EN BIT(0) +#define SVC_I3C_MCONFIG_DISTO(x) FIELD_PREP(BIT(3), (x)) +#define SVC_I3C_MCONFIG_HKEEP(x) FIELD_PREP(GENMASK(5, 4), (x)) +#define SVC_I3C_MCONFIG_ODSTOP(x) FIELD_PREP(BIT(6), (x)) +#define SVC_I3C_MCONFIG_PPBAUD(x) FIELD_PREP(GENMASK(11, 8), (x)) +#define SVC_I3C_MCONFIG_PPLOW(x) FIELD_PREP(GENMASK(15, 12), (x)) +#define SVC_I3C_MCONFIG_ODBAUD(x) FIELD_PREP(GENMASK(23, 16), (x)) +#define SVC_I3C_MCONFIG_ODHPP(x) FIELD_PREP(BIT(24), (x)) +#define SVC_I3C_MCONFIG_SKEW(x) FIELD_PREP(GENMASK(27, 25), (x)) +#define SVC_I3C_MCONFIG_I2CBAUD(x) FIELD_PREP(GENMASK(31, 28), (x)) + +#define SVC_I3C_MCTRL 0x084 +#define SVC_I3C_MCTRL_REQUEST_MASK GENMASK(2, 0) +#define SVC_I3C_MCTRL_REQUEST_NONE 0 +#define SVC_I3C_MCTRL_REQUEST_START_ADDR 1 +#define SVC_I3C_MCTRL_REQUEST_STOP 2 +#define SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK 3 +#define SVC_I3C_MCTRL_REQUEST_PROC_DAA 4 +#define SVC_I3C_MCTRL_REQUEST_AUTO_IBI 7 +#define SVC_I3C_MCTRL_TYPE_I3C 0 +#define SVC_I3C_MCTRL_TYPE_I2C BIT(4) +#define SVC_I3C_MCTRL_IBIRESP_AUTO 0 +#define SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE 0 +#define SVC_I3C_MCTRL_IBIRESP_ACK_WITH_BYTE BIT(7) +#define SVC_I3C_MCTRL_IBIRESP_NACK BIT(6) +#define SVC_I3C_MCTRL_IBIRESP_MANUAL GENMASK(7, 6) +#define SVC_I3C_MCTRL_DIR(x) FIELD_PREP(BIT(8), (x)) +#define SVC_I3C_MCTRL_DIR_WRITE 0 +#define SVC_I3C_MCTRL_DIR_READ 1 +#define SVC_I3C_MCTRL_ADDR(x) FIELD_PREP(GENMASK(15, 9), (x)) +#define SVC_I3C_MCTRL_RDTERM(x) FIELD_PREP(GENMASK(23, 16), (x)) + +#define SVC_I3C_MSTATUS 0x088 +#define SVC_I3C_MSTATUS_STATE(x) FIELD_GET(GENMASK(2, 0), (x)) +#define SVC_I3C_MSTATUS_STATE_DAA(x) (SVC_I3C_MSTATUS_STATE(x) == 5) +#define SVC_I3C_MSTATUS_STATE_IDLE(x) (SVC_I3C_MSTATUS_STATE(x) == 0) +#define SVC_I3C_MSTATUS_BETWEEN(x) FIELD_GET(BIT(4), (x)) +#define SVC_I3C_MSTATUS_NACKED(x) FIELD_GET(BIT(5), (x)) +#define SVC_I3C_MSTATUS_IBITYPE(x) FIELD_GET(GENMASK(7, 6), (x)) +#define SVC_I3C_MSTATUS_IBITYPE_IBI 1 +#define SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST 2 +#define SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN 3 +#define SVC_I3C_MINT_SLVSTART BIT(8) +#define SVC_I3C_MINT_MCTRLDONE BIT(9) +#define SVC_I3C_MINT_COMPLETE BIT(10) +#define SVC_I3C_MINT_RXPEND BIT(11) +#define SVC_I3C_MINT_TXNOTFULL BIT(12) +#define SVC_I3C_MINT_IBIWON BIT(13) +#define SVC_I3C_MINT_ERRWARN BIT(15) +#define SVC_I3C_MSTATUS_SLVSTART(x) FIELD_GET(SVC_I3C_MINT_SLVSTART, (x)) +#define SVC_I3C_MSTATUS_MCTRLDONE(x) FIELD_GET(SVC_I3C_MINT_MCTRLDONE, (x)) +#define SVC_I3C_MSTATUS_COMPLETE(x) FIELD_GET(SVC_I3C_MINT_COMPLETE, (x)) +#define SVC_I3C_MSTATUS_RXPEND(x) FIELD_GET(SVC_I3C_MINT_RXPEND, (x)) +#define SVC_I3C_MSTATUS_TXNOTFULL(x) FIELD_GET(SVC_I3C_MINT_TXNOTFULL, (x)) +#define SVC_I3C_MSTATUS_IBIWON(x) FIELD_GET(SVC_I3C_MINT_IBIWON, (x)) +#define SVC_I3C_MSTATUS_ERRWARN(x) FIELD_GET(SVC_I3C_MINT_ERRWARN, (x)) +#define SVC_I3C_MSTATUS_IBIADDR(x) FIELD_GET(GENMASK(30, 24), (x)) + +#define SVC_I3C_IBIRULES 0x08C +#define SVC_I3C_IBIRULES_ADDR(slot, addr) FIELD_PREP(GENMASK(29, 0), \ + ((addr) & 0x3F) << ((slot) * 6)) +#define SVC_I3C_IBIRULES_ADDRS 5 +#define SVC_I3C_IBIRULES_MSB0 BIT(30) +#define SVC_I3C_IBIRULES_NOBYTE BIT(31) +#define SVC_I3C_IBIRULES_MANDBYTE 0 +#define SVC_I3C_MINTSET 0x090 +#define SVC_I3C_MINTCLR 0x094 +#define SVC_I3C_MINTMASKED 0x098 +#define SVC_I3C_MERRWARN 0x09C +#define SVC_I3C_MERRWARN_NACK BIT(2) +#define SVC_I3C_MERRWARN_TIMEOUT BIT(20) +#define SVC_I3C_MDMACTRL 0x0A0 +#define SVC_I3C_MDATACTRL 0x0AC +#define SVC_I3C_MDATACTRL_FLUSHTB BIT(0) +#define SVC_I3C_MDATACTRL_FLUSHRB BIT(1) +#define SVC_I3C_MDATACTRL_UNLOCK_TRIG BIT(3) +#define SVC_I3C_MDATACTRL_TXTRIG_FIFO_NOT_FULL GENMASK(5, 4) +#define SVC_I3C_MDATACTRL_RXTRIG_FIFO_NOT_EMPTY 0 +#define SVC_I3C_MDATACTRL_RXCOUNT(x) FIELD_GET(GENMASK(28, 24), (x)) +#define SVC_I3C_MDATACTRL_TXFULL BIT(30) +#define SVC_I3C_MDATACTRL_RXEMPTY BIT(31) + +#define SVC_I3C_MWDATAB 0x0B0 +#define SVC_I3C_MWDATAB_END BIT(8) + +#define SVC_I3C_MWDATABE 0x0B4 +#define SVC_I3C_MWDATAH 0x0B8 +#define SVC_I3C_MWDATAHE 0x0BC +#define SVC_I3C_MRDATAB 0x0C0 +#define SVC_I3C_MRDATAH 0x0C8 +#define SVC_I3C_MWMSG_SDR 0x0D0 +#define SVC_I3C_MRMSG_SDR 0x0D4 +#define SVC_I3C_MWMSG_DDR 0x0D8 +#define SVC_I3C_MRMSG_DDR 0x0DC + +#define SVC_I3C_MDYNADDR 0x0E4 +#define SVC_MDYNADDR_VALID BIT(0) +#define SVC_MDYNADDR_ADDR(x) FIELD_PREP(GENMASK(7, 1), (x)) + +#define SVC_I3C_MAX_DEVS 32 +#define SVC_I3C_PM_TIMEOUT_MS 1000 + +/* This parameter depends on the implementation and may be tuned */ +#define SVC_I3C_FIFO_SIZE 16 + +struct svc_i3c_cmd { + u8 addr; + bool rnw; + u8 *in; + const void *out; + unsigned int len; + unsigned int read_len; + bool continued; +}; + +struct svc_i3c_xfer { + struct list_head node; + struct completion comp; + int ret; + unsigned int type; + unsigned int ncmds; + struct svc_i3c_cmd cmds[]; +}; + +struct svc_i3c_regs_save { + u32 mconfig; + u32 mdynaddr; +}; + +/** + * struct svc_i3c_master - Silvaco I3C Master structure + * @base: I3C master controller + * @dev: Corresponding device + * @regs: Memory mapping + * @saved_regs: Volatile values for PM operations + * @free_slots: Bit array of available slots + * @addrs: Array containing the dynamic addresses of each attached device + * @descs: Array of descriptors, one per attached device + * @hj_work: Hot-join work + * @ibi_work: IBI work + * @irq: Main interrupt + * @pclk: System clock + * @fclk: Fast clock (bus) + * @sclk: Slow clock (other events) + * @xferqueue: Transfer queue structure + * @xferqueue.list: List member + * @xferqueue.cur: Current ongoing transfer + * @xferqueue.lock: Queue lock + * @ibi: IBI structure + * @ibi.num_slots: Number of slots available in @ibi.slots + * @ibi.slots: Available IBI slots + * @ibi.tbq_slot: To be queued IBI slot + * @ibi.lock: IBI lock + * @lock: Transfer lock, protect between IBI work thread and callbacks from master + */ +struct svc_i3c_master { + struct i3c_master_controller base; + struct device *dev; + void __iomem *regs; + struct svc_i3c_regs_save saved_regs; + u32 free_slots; + u8 addrs[SVC_I3C_MAX_DEVS]; + struct i3c_dev_desc *descs[SVC_I3C_MAX_DEVS]; + struct work_struct hj_work; + struct work_struct ibi_work; + int irq; + struct clk *pclk; + struct clk *fclk; + struct clk *sclk; + struct { + struct list_head list; + struct svc_i3c_xfer *cur; + /* Prevent races between transfers */ + spinlock_t lock; + } xferqueue; + struct { + unsigned int num_slots; + struct i3c_dev_desc **slots; + struct i3c_ibi_slot *tbq_slot; + /* Prevent races within IBI handlers */ + spinlock_t lock; + } ibi; + struct mutex lock; +}; + +/** + * struct svc_i3c_i2c_dev_data - Device specific data + * @index: Index in the master tables corresponding to this device + * @ibi: IBI slot index in the master structure + * @ibi_pool: IBI pool associated to this device + */ +struct svc_i3c_i2c_dev_data { + u8 index; + int ibi; + struct i3c_generic_ibi_pool *ibi_pool; +}; + +static bool svc_i3c_master_error(struct svc_i3c_master *master) +{ + u32 mstatus, merrwarn; + + mstatus = readl(master->regs + SVC_I3C_MSTATUS); + if (SVC_I3C_MSTATUS_ERRWARN(mstatus)) { + merrwarn = readl(master->regs + SVC_I3C_MERRWARN); + writel(merrwarn, master->regs + SVC_I3C_MERRWARN); + + /* Ignore timeout error */ + if (merrwarn & SVC_I3C_MERRWARN_TIMEOUT) { + dev_dbg(master->dev, "Warning condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", + mstatus, merrwarn); + return false; + } + + dev_err(master->dev, + "Error condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", + mstatus, merrwarn); + + return true; + } + + return false; +} + +static void svc_i3c_master_enable_interrupts(struct svc_i3c_master *master, u32 mask) +{ + writel(mask, master->regs + SVC_I3C_MINTSET); +} + +static void svc_i3c_master_disable_interrupts(struct svc_i3c_master *master) +{ + u32 mask = readl(master->regs + SVC_I3C_MINTSET); + + writel(mask, master->regs + SVC_I3C_MINTCLR); +} + +static void svc_i3c_master_clear_merrwarn(struct svc_i3c_master *master) +{ + /* Clear pending warnings */ + writel(readl(master->regs + SVC_I3C_MERRWARN), + master->regs + SVC_I3C_MERRWARN); +} + +static void svc_i3c_master_flush_fifo(struct svc_i3c_master *master) +{ + /* Flush FIFOs */ + writel(SVC_I3C_MDATACTRL_FLUSHTB | SVC_I3C_MDATACTRL_FLUSHRB, + master->regs + SVC_I3C_MDATACTRL); +} + +static void svc_i3c_master_reset_fifo_trigger(struct svc_i3c_master *master) +{ + u32 reg; + + /* Set RX and TX tigger levels, flush FIFOs */ + reg = SVC_I3C_MDATACTRL_FLUSHTB | + SVC_I3C_MDATACTRL_FLUSHRB | + SVC_I3C_MDATACTRL_UNLOCK_TRIG | + SVC_I3C_MDATACTRL_TXTRIG_FIFO_NOT_FULL | + SVC_I3C_MDATACTRL_RXTRIG_FIFO_NOT_EMPTY; + writel(reg, master->regs + SVC_I3C_MDATACTRL); +} + +static void svc_i3c_master_reset(struct svc_i3c_master *master) +{ + svc_i3c_master_clear_merrwarn(master); + svc_i3c_master_reset_fifo_trigger(master); + svc_i3c_master_disable_interrupts(master); +} + +static inline struct svc_i3c_master * +to_svc_i3c_master(struct i3c_master_controller *master) +{ + return container_of(master, struct svc_i3c_master, base); +} + +static void svc_i3c_master_hj_work(struct work_struct *work) +{ + struct svc_i3c_master *master; + + master = container_of(work, struct svc_i3c_master, hj_work); + i3c_master_do_daa(&master->base); +} + +static struct i3c_dev_desc * +svc_i3c_master_dev_from_addr(struct svc_i3c_master *master, + unsigned int ibiaddr) +{ + int i; + + for (i = 0; i < SVC_I3C_MAX_DEVS; i++) + if (master->addrs[i] == ibiaddr) + break; + + if (i == SVC_I3C_MAX_DEVS) + return NULL; + + return master->descs[i]; +} + +static void svc_i3c_master_emit_stop(struct svc_i3c_master *master) +{ + writel(SVC_I3C_MCTRL_REQUEST_STOP, master->regs + SVC_I3C_MCTRL); + + /* + * This delay is necessary after the emission of a stop, otherwise eg. + * repeating IBIs do not get detected. There is a note in the manual + * about it, stating that the stop condition might not be settled + * correctly if a start condition follows too rapidly. + */ + udelay(1); +} + +static int svc_i3c_master_handle_ibi(struct svc_i3c_master *master, + struct i3c_dev_desc *dev) +{ + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + struct i3c_ibi_slot *slot; + unsigned int count; + u32 mdatactrl; + int ret, val; + u8 *buf; + + slot = i3c_generic_ibi_get_free_slot(data->ibi_pool); + if (!slot) + return -ENOSPC; + + slot->len = 0; + buf = slot->data; + + ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, + SVC_I3C_MSTATUS_COMPLETE(val), 0, 1000); + if (ret) { + dev_err(master->dev, "Timeout when polling for COMPLETE\n"); + return ret; + } + + while (SVC_I3C_MSTATUS_RXPEND(readl(master->regs + SVC_I3C_MSTATUS)) && + slot->len < SVC_I3C_FIFO_SIZE) { + mdatactrl = readl(master->regs + SVC_I3C_MDATACTRL); + count = SVC_I3C_MDATACTRL_RXCOUNT(mdatactrl); + readsl(master->regs + SVC_I3C_MRDATAB, buf, count); + slot->len += count; + buf += count; + } + + master->ibi.tbq_slot = slot; + + return 0; +} + +static void svc_i3c_master_ack_ibi(struct svc_i3c_master *master, + bool mandatory_byte) +{ + unsigned int ibi_ack_nack; + + ibi_ack_nack = SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK; + if (mandatory_byte) + ibi_ack_nack |= SVC_I3C_MCTRL_IBIRESP_ACK_WITH_BYTE; + else + ibi_ack_nack |= SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE; + + writel(ibi_ack_nack, master->regs + SVC_I3C_MCTRL); +} + +static void svc_i3c_master_nack_ibi(struct svc_i3c_master *master) +{ + writel(SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK | + SVC_I3C_MCTRL_IBIRESP_NACK, + master->regs + SVC_I3C_MCTRL); +} + +static void svc_i3c_master_ibi_work(struct work_struct *work) +{ + struct svc_i3c_master *master = container_of(work, struct svc_i3c_master, ibi_work); + struct svc_i3c_i2c_dev_data *data; + unsigned int ibitype, ibiaddr; + struct i3c_dev_desc *dev; + u32 status, val; + int ret; + + mutex_lock(&master->lock); + /* Acknowledge the incoming interrupt with the AUTOIBI mechanism */ + writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI | + SVC_I3C_MCTRL_IBIRESP_AUTO, + master->regs + SVC_I3C_MCTRL); + + /* Wait for IBIWON, should take approximately 100us */ + ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, + SVC_I3C_MSTATUS_IBIWON(val), 0, 1000); + if (ret) { + dev_err(master->dev, "Timeout when polling for IBIWON\n"); + svc_i3c_master_emit_stop(master); + goto reenable_ibis; + } + + /* Clear the interrupt status */ + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + + status = readl(master->regs + SVC_I3C_MSTATUS); + ibitype = SVC_I3C_MSTATUS_IBITYPE(status); + ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status); + + /* Handle the critical responses to IBI's */ + switch (ibitype) { + case SVC_I3C_MSTATUS_IBITYPE_IBI: + dev = svc_i3c_master_dev_from_addr(master, ibiaddr); + if (!dev) + svc_i3c_master_nack_ibi(master); + else + svc_i3c_master_handle_ibi(master, dev); + break; + case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: + svc_i3c_master_ack_ibi(master, false); + break; + case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: + svc_i3c_master_nack_ibi(master); + break; + default: + break; + } + + /* + * If an error happened, we probably got interrupted and the exchange + * timedout. In this case we just drop everything, emit a stop and wait + * for the slave to interrupt again. + */ + if (svc_i3c_master_error(master)) { + if (master->ibi.tbq_slot) { + data = i3c_dev_get_master_data(dev); + i3c_generic_ibi_recycle_slot(data->ibi_pool, + master->ibi.tbq_slot); + master->ibi.tbq_slot = NULL; + } + + svc_i3c_master_emit_stop(master); + + goto reenable_ibis; + } + + /* Handle the non critical tasks */ + switch (ibitype) { + case SVC_I3C_MSTATUS_IBITYPE_IBI: + if (dev) { + i3c_master_queue_ibi(dev, master->ibi.tbq_slot); + master->ibi.tbq_slot = NULL; + } + svc_i3c_master_emit_stop(master); + break; + case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: + queue_work(master->base.wq, &master->hj_work); + break; + case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: + default: + break; + } + +reenable_ibis: + svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); + mutex_unlock(&master->lock); +} + +static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id) +{ + struct svc_i3c_master *master = (struct svc_i3c_master *)dev_id; + u32 active = readl(master->regs + SVC_I3C_MSTATUS); + + if (!SVC_I3C_MSTATUS_SLVSTART(active)) + return IRQ_NONE; + + /* Clear the interrupt status */ + writel(SVC_I3C_MINT_SLVSTART, master->regs + SVC_I3C_MSTATUS); + + svc_i3c_master_disable_interrupts(master); + + /* Handle the interrupt in a non atomic context */ + queue_work(master->base.wq, &master->ibi_work); + + return IRQ_HANDLED; +} + +static int svc_i3c_master_bus_init(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct i3c_bus *bus = i3c_master_get_bus(m); + struct i3c_device_info info = {}; + unsigned long fclk_rate, fclk_period_ns; + unsigned int high_period_ns, od_low_period_ns; + u32 ppbaud, pplow, odhpp, odbaud, odstop, i2cbaud, reg; + int ret; + + ret = pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, + "<%s> cannot resume i3c bus master, err: %d\n", + __func__, ret); + return ret; + } + + /* Timings derivation */ + fclk_rate = clk_get_rate(master->fclk); + if (!fclk_rate) { + ret = -EINVAL; + goto rpm_out; + } + + fclk_period_ns = DIV_ROUND_UP(1000000000, fclk_rate); + + /* + * Using I3C Push-Pull mode, target is 12.5MHz/80ns period. + * Simplest configuration is using a 50% duty-cycle of 40ns. + */ + ppbaud = DIV_ROUND_UP(40, fclk_period_ns) - 1; + pplow = 0; + + /* + * Using I3C Open-Drain mode, target is 4.17MHz/240ns with a + * duty-cycle tuned so that high levels are filetered out by + * the 50ns filter (target being 40ns). + */ + odhpp = 1; + high_period_ns = (ppbaud + 1) * fclk_period_ns; + odbaud = DIV_ROUND_UP(240 - high_period_ns, high_period_ns) - 1; + od_low_period_ns = (odbaud + 1) * high_period_ns; + + switch (bus->mode) { + case I3C_BUS_MODE_PURE: + i2cbaud = 0; + odstop = 0; + break; + case I3C_BUS_MODE_MIXED_FAST: + case I3C_BUS_MODE_MIXED_LIMITED: + /* + * Using I2C Fm+ mode, target is 1MHz/1000ns, the difference + * between the high and low period does not really matter. + */ + i2cbaud = DIV_ROUND_UP(1000, od_low_period_ns) - 2; + odstop = 1; + break; + case I3C_BUS_MODE_MIXED_SLOW: + /* + * Using I2C Fm mode, target is 0.4MHz/2500ns, with the same + * constraints as the FM+ mode. + */ + i2cbaud = DIV_ROUND_UP(2500, od_low_period_ns) - 2; + odstop = 1; + break; + default: + goto rpm_out; + } + + reg = SVC_I3C_MCONFIG_MASTER_EN | + SVC_I3C_MCONFIG_DISTO(0) | + SVC_I3C_MCONFIG_HKEEP(0) | + SVC_I3C_MCONFIG_ODSTOP(odstop) | + SVC_I3C_MCONFIG_PPBAUD(ppbaud) | + SVC_I3C_MCONFIG_PPLOW(pplow) | + SVC_I3C_MCONFIG_ODBAUD(odbaud) | + SVC_I3C_MCONFIG_ODHPP(odhpp) | + SVC_I3C_MCONFIG_SKEW(0) | + SVC_I3C_MCONFIG_I2CBAUD(i2cbaud); + writel(reg, master->regs + SVC_I3C_MCONFIG); + + /* Master core's registration */ + ret = i3c_master_get_free_addr(m, 0); + if (ret < 0) + goto rpm_out; + + info.dyn_addr = ret; + + writel(SVC_MDYNADDR_VALID | SVC_MDYNADDR_ADDR(info.dyn_addr), + master->regs + SVC_I3C_MDYNADDR); + + ret = i3c_master_set_info(&master->base, &info); + if (ret) + goto rpm_out; + +rpm_out: + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); + + return ret; +} + +static void svc_i3c_master_bus_cleanup(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master = to_svc_i3c_master(m); + int ret; + + ret = pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); + return; + } + + svc_i3c_master_disable_interrupts(master); + + /* Disable master */ + writel(0, master->regs + SVC_I3C_MCONFIG); + + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); +} + +static int svc_i3c_master_reserve_slot(struct svc_i3c_master *master) +{ + unsigned int slot; + + if (!(master->free_slots & GENMASK(SVC_I3C_MAX_DEVS - 1, 0))) + return -ENOSPC; + + slot = ffs(master->free_slots) - 1; + + master->free_slots &= ~BIT(slot); + + return slot; +} + +static void svc_i3c_master_release_slot(struct svc_i3c_master *master, + unsigned int slot) +{ + master->free_slots |= BIT(slot); +} + +static int svc_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data; + int slot; + + slot = svc_i3c_master_reserve_slot(master); + if (slot < 0) + return slot; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) { + svc_i3c_master_release_slot(master, slot); + return -ENOMEM; + } + + data->ibi = -1; + data->index = slot; + master->addrs[slot] = dev->info.dyn_addr ? dev->info.dyn_addr : + dev->info.static_addr; + master->descs[slot] = dev; + + i3c_dev_set_master_data(dev, data); + + return 0; +} + +static int svc_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, + u8 old_dyn_addr) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + + master->addrs[data->index] = dev->info.dyn_addr ? dev->info.dyn_addr : + dev->info.static_addr; + + return 0; +} + +static void svc_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev) +{ + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + + master->addrs[data->index] = 0; + svc_i3c_master_release_slot(master, data->index); + + kfree(data); +} + +static int svc_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev) +{ + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data; + int slot; + + slot = svc_i3c_master_reserve_slot(master); + if (slot < 0) + return slot; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) { + svc_i3c_master_release_slot(master, slot); + return -ENOMEM; + } + + data->index = slot; + master->addrs[slot] = dev->addr; + + i2c_dev_set_master_data(dev, data); + + return 0; +} + +static void svc_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev) +{ + struct svc_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev); + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + + svc_i3c_master_release_slot(master, data->index); + + kfree(data); +} + +static int svc_i3c_master_readb(struct svc_i3c_master *master, u8 *dst, + unsigned int len) +{ + int ret, i; + u32 reg; + + for (i = 0; i < len; i++) { + ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, + reg, + SVC_I3C_MSTATUS_RXPEND(reg), + 0, 1000); + if (ret) + return ret; + + dst[i] = readl(master->regs + SVC_I3C_MRDATAB); + } + + return 0; +} + +static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master, + u8 *addrs, unsigned int *count) +{ + u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0; + unsigned int dev_nb = 0, last_addr = 0; + u32 reg; + int ret, i; + + while (true) { + /* Enter/proceed with DAA */ + writel(SVC_I3C_MCTRL_REQUEST_PROC_DAA | + SVC_I3C_MCTRL_TYPE_I3C | + SVC_I3C_MCTRL_IBIRESP_NACK | + SVC_I3C_MCTRL_DIR(SVC_I3C_MCTRL_DIR_WRITE), + master->regs + SVC_I3C_MCTRL); + + /* + * Either one slave will send its ID, or the assignment process + * is done. + */ + ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, + reg, + SVC_I3C_MSTATUS_RXPEND(reg) | + SVC_I3C_MSTATUS_MCTRLDONE(reg), + 1, 1000); + if (ret) + return ret; + + if (SVC_I3C_MSTATUS_RXPEND(reg)) { + u8 data[6]; + + /* + * We only care about the 48-bit provisional ID yet to + * be sure a device does not nack an address twice. + * Otherwise, we would just need to flush the RX FIFO. + */ + ret = svc_i3c_master_readb(master, data, 6); + if (ret) + return ret; + + for (i = 0; i < 6; i++) + prov_id[dev_nb] |= (u64)(data[i]) << (8 * (5 - i)); + + /* We do not care about the BCR and DCR yet */ + ret = svc_i3c_master_readb(master, data, 2); + if (ret) + return ret; + } else if (SVC_I3C_MSTATUS_MCTRLDONE(reg)) { + if (SVC_I3C_MSTATUS_STATE_IDLE(reg) && + SVC_I3C_MSTATUS_COMPLETE(reg)) { + /* + * All devices received and acked they dynamic + * address, this is the natural end of the DAA + * procedure. + */ + break; + } else if (SVC_I3C_MSTATUS_NACKED(reg)) { + /* No I3C devices attached */ + if (dev_nb == 0) + break; + + /* + * A slave device nacked the address, this is + * allowed only once, DAA will be stopped and + * then resumed. The same device is supposed to + * answer again immediately and shall ack the + * address this time. + */ + if (prov_id[dev_nb] == nacking_prov_id) + return -EIO; + + dev_nb--; + nacking_prov_id = prov_id[dev_nb]; + svc_i3c_master_emit_stop(master); + + continue; + } else { + return -EIO; + } + } + + /* Wait for the slave to be ready to receive its address */ + ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, + reg, + SVC_I3C_MSTATUS_MCTRLDONE(reg) && + SVC_I3C_MSTATUS_STATE_DAA(reg) && + SVC_I3C_MSTATUS_BETWEEN(reg), + 0, 1000); + if (ret) + return ret; + + /* Give the slave device a suitable dynamic address */ + ret = i3c_master_get_free_addr(&master->base, last_addr + 1); + if (ret < 0) + return ret; + + addrs[dev_nb] = ret; + dev_dbg(master->dev, "DAA: device %d assigned to 0x%02x\n", + dev_nb, addrs[dev_nb]); + + writel(addrs[dev_nb], master->regs + SVC_I3C_MWDATAB); + last_addr = addrs[dev_nb++]; + } + + *count = dev_nb; + + return 0; +} + +static int svc_i3c_update_ibirules(struct svc_i3c_master *master) +{ + struct i3c_dev_desc *dev; + u32 reg_mbyte = 0, reg_nobyte = SVC_I3C_IBIRULES_NOBYTE; + unsigned int mbyte_addr_ok = 0, mbyte_addr_ko = 0, nobyte_addr_ok = 0, + nobyte_addr_ko = 0; + bool list_mbyte = false, list_nobyte = false; + + /* Create the IBIRULES register for both cases */ + i3c_bus_for_each_i3cdev(&master->base.bus, dev) { + if (I3C_BCR_DEVICE_ROLE(dev->info.bcr) == I3C_BCR_I3C_MASTER) + continue; + + if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD) { + reg_mbyte |= SVC_I3C_IBIRULES_ADDR(mbyte_addr_ok, + dev->info.dyn_addr); + + /* IBI rules cannot be applied to devices with MSb=1 */ + if (dev->info.dyn_addr & BIT(7)) + mbyte_addr_ko++; + else + mbyte_addr_ok++; + } else { + reg_nobyte |= SVC_I3C_IBIRULES_ADDR(nobyte_addr_ok, + dev->info.dyn_addr); + + /* IBI rules cannot be applied to devices with MSb=1 */ + if (dev->info.dyn_addr & BIT(7)) + nobyte_addr_ko++; + else + nobyte_addr_ok++; + } + } + + /* Device list cannot be handled by hardware */ + if (!mbyte_addr_ko && mbyte_addr_ok <= SVC_I3C_IBIRULES_ADDRS) + list_mbyte = true; + + if (!nobyte_addr_ko && nobyte_addr_ok <= SVC_I3C_IBIRULES_ADDRS) + list_nobyte = true; + + /* No list can be properly handled, return an error */ + if (!list_mbyte && !list_nobyte) + return -ERANGE; + + /* Pick the first list that can be handled by hardware, randomly */ + if (list_mbyte) + writel(reg_mbyte, master->regs + SVC_I3C_IBIRULES); + else + writel(reg_nobyte, master->regs + SVC_I3C_IBIRULES); + + return 0; +} + +static int svc_i3c_master_do_daa(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master = to_svc_i3c_master(m); + u8 addrs[SVC_I3C_MAX_DEVS]; + unsigned long flags; + unsigned int dev_nb; + int ret, i; + + ret = pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); + return ret; + } + + spin_lock_irqsave(&master->xferqueue.lock, flags); + ret = svc_i3c_master_do_daa_locked(master, addrs, &dev_nb); + spin_unlock_irqrestore(&master->xferqueue.lock, flags); + if (ret) { + svc_i3c_master_emit_stop(master); + svc_i3c_master_clear_merrwarn(master); + goto rpm_out; + } + + /* Register all devices who participated to the core */ + for (i = 0; i < dev_nb; i++) { + ret = i3c_master_add_i3c_dev_locked(m, addrs[i]); + if (ret) + goto rpm_out; + } + + /* Configure IBI auto-rules */ + ret = svc_i3c_update_ibirules(master); + if (ret) + dev_err(master->dev, "Cannot handle such a list of devices"); + +rpm_out: + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); + + return ret; +} + +static int svc_i3c_master_read(struct svc_i3c_master *master, + u8 *in, unsigned int len) +{ + int offset = 0, i; + u32 mdctrl, mstatus; + bool completed = false; + unsigned int count; + unsigned long start = jiffies; + + while (!completed) { + mstatus = readl(master->regs + SVC_I3C_MSTATUS); + if (SVC_I3C_MSTATUS_COMPLETE(mstatus) != 0) + completed = true; + + if (time_after(jiffies, start + msecs_to_jiffies(1000))) { + dev_dbg(master->dev, "I3C read timeout\n"); + return -ETIMEDOUT; + } + + mdctrl = readl(master->regs + SVC_I3C_MDATACTRL); + count = SVC_I3C_MDATACTRL_RXCOUNT(mdctrl); + if (offset + count > len) { + dev_err(master->dev, "I3C receive length too long!\n"); + return -EINVAL; + } + for (i = 0; i < count; i++) + in[offset + i] = readl(master->regs + SVC_I3C_MRDATAB); + + offset += count; + } + + return offset; +} + +static int svc_i3c_master_write(struct svc_i3c_master *master, + const u8 *out, unsigned int len) +{ + int offset = 0, ret; + u32 mdctrl; + + while (offset < len) { + ret = readl_poll_timeout(master->regs + SVC_I3C_MDATACTRL, + mdctrl, + !(mdctrl & SVC_I3C_MDATACTRL_TXFULL), + 0, 1000); + if (ret) + return ret; + + /* + * The last byte to be sent over the bus must either have the + * "end" bit set or be written in MWDATABE. + */ + if (likely(offset < (len - 1))) + writel(out[offset++], master->regs + SVC_I3C_MWDATAB); + else + writel(out[offset++], master->regs + SVC_I3C_MWDATABE); + } + + return 0; +} + +static int svc_i3c_master_xfer(struct svc_i3c_master *master, + bool rnw, unsigned int xfer_type, u8 addr, + u8 *in, const u8 *out, unsigned int xfer_len, + unsigned int *read_len, bool continued) +{ + u32 reg; + int ret; + + /* clean SVC_I3C_MINT_IBIWON w1c bits */ + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + + writel(SVC_I3C_MCTRL_REQUEST_START_ADDR | + xfer_type | + SVC_I3C_MCTRL_IBIRESP_NACK | + SVC_I3C_MCTRL_DIR(rnw) | + SVC_I3C_MCTRL_ADDR(addr) | + SVC_I3C_MCTRL_RDTERM(*read_len), + master->regs + SVC_I3C_MCTRL); + + ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, + SVC_I3C_MSTATUS_MCTRLDONE(reg), 0, 1000); + if (ret) + goto emit_stop; + + if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { + ret = -ENXIO; + goto emit_stop; + } + + /* + * According to I3C spec ver 1.1.1, 5.1.2.2.3 Consequence of Controller Starting a Frame + * with I3C Target Address. + * + * The I3C Controller normally should start a Frame, the Address may be arbitrated, and so + * the Controller shall monitor to see whether an In-Band Interrupt request, a Controller + * Role Request (i.e., Secondary Controller requests to become the Active Controller), or + * a Hot-Join Request has been made. + * + * If missed IBIWON check, the wrong data will be return. When IBIWON happen, return failure + * and yield the above events handler. + */ + if (SVC_I3C_MSTATUS_IBIWON(reg)) { + ret = -ENXIO; + goto emit_stop; + } + + if (rnw) + ret = svc_i3c_master_read(master, in, xfer_len); + else + ret = svc_i3c_master_write(master, out, xfer_len); + if (ret < 0) + goto emit_stop; + + if (rnw) + *read_len = ret; + + ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, + SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000); + if (ret) + goto emit_stop; + + writel(SVC_I3C_MINT_COMPLETE, master->regs + SVC_I3C_MSTATUS); + + if (!continued) { + svc_i3c_master_emit_stop(master); + + /* Wait idle if stop is sent. */ + readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, + SVC_I3C_MSTATUS_STATE_IDLE(reg), 0, 1000); + } + + return 0; + +emit_stop: + svc_i3c_master_emit_stop(master); + svc_i3c_master_clear_merrwarn(master); + + return ret; +} + +static struct svc_i3c_xfer * +svc_i3c_master_alloc_xfer(struct svc_i3c_master *master, unsigned int ncmds) +{ + struct svc_i3c_xfer *xfer; + + xfer = kzalloc(struct_size(xfer, cmds, ncmds), GFP_KERNEL); + if (!xfer) + return NULL; + + INIT_LIST_HEAD(&xfer->node); + xfer->ncmds = ncmds; + xfer->ret = -ETIMEDOUT; + + return xfer; +} + +static void svc_i3c_master_free_xfer(struct svc_i3c_xfer *xfer) +{ + kfree(xfer); +} + +static void svc_i3c_master_dequeue_xfer_locked(struct svc_i3c_master *master, + struct svc_i3c_xfer *xfer) +{ + if (master->xferqueue.cur == xfer) + master->xferqueue.cur = NULL; + else + list_del_init(&xfer->node); +} + +static void svc_i3c_master_dequeue_xfer(struct svc_i3c_master *master, + struct svc_i3c_xfer *xfer) +{ + unsigned long flags; + + spin_lock_irqsave(&master->xferqueue.lock, flags); + svc_i3c_master_dequeue_xfer_locked(master, xfer); + spin_unlock_irqrestore(&master->xferqueue.lock, flags); +} + +static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master) +{ + struct svc_i3c_xfer *xfer = master->xferqueue.cur; + int ret, i; + + if (!xfer) + return; + + svc_i3c_master_clear_merrwarn(master); + svc_i3c_master_flush_fifo(master); + + for (i = 0; i < xfer->ncmds; i++) { + struct svc_i3c_cmd *cmd = &xfer->cmds[i]; + + ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type, + cmd->addr, cmd->in, cmd->out, + cmd->len, &cmd->read_len, + cmd->continued); + if (ret) + break; + } + + xfer->ret = ret; + complete(&xfer->comp); + + if (ret < 0) + svc_i3c_master_dequeue_xfer_locked(master, xfer); + + xfer = list_first_entry_or_null(&master->xferqueue.list, + struct svc_i3c_xfer, + node); + if (xfer) + list_del_init(&xfer->node); + + master->xferqueue.cur = xfer; + svc_i3c_master_start_xfer_locked(master); +} + +static void svc_i3c_master_enqueue_xfer(struct svc_i3c_master *master, + struct svc_i3c_xfer *xfer) +{ + unsigned long flags; + int ret; + + ret = pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); + return; + } + + init_completion(&xfer->comp); + spin_lock_irqsave(&master->xferqueue.lock, flags); + if (master->xferqueue.cur) { + list_add_tail(&xfer->node, &master->xferqueue.list); + } else { + master->xferqueue.cur = xfer; + svc_i3c_master_start_xfer_locked(master); + } + spin_unlock_irqrestore(&master->xferqueue.lock, flags); + + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); +} + +static bool +svc_i3c_master_supports_ccc_cmd(struct i3c_master_controller *master, + const struct i3c_ccc_cmd *cmd) +{ + /* No software support for CCC commands targeting more than one slave */ + return (cmd->ndests == 1); +} + +static int svc_i3c_master_send_bdcast_ccc_cmd(struct svc_i3c_master *master, + struct i3c_ccc_cmd *ccc) +{ + unsigned int xfer_len = ccc->dests[0].payload.len + 1; + struct svc_i3c_xfer *xfer; + struct svc_i3c_cmd *cmd; + u8 *buf; + int ret; + + xfer = svc_i3c_master_alloc_xfer(master, 1); + if (!xfer) + return -ENOMEM; + + buf = kmalloc(xfer_len, GFP_KERNEL); + if (!buf) { + svc_i3c_master_free_xfer(xfer); + return -ENOMEM; + } + + buf[0] = ccc->id; + memcpy(&buf[1], ccc->dests[0].payload.data, ccc->dests[0].payload.len); + + xfer->type = SVC_I3C_MCTRL_TYPE_I3C; + + cmd = &xfer->cmds[0]; + cmd->addr = ccc->dests[0].addr; + cmd->rnw = ccc->rnw; + cmd->in = NULL; + cmd->out = buf; + cmd->len = xfer_len; + cmd->read_len = 0; + cmd->continued = false; + + mutex_lock(&master->lock); + svc_i3c_master_enqueue_xfer(master, xfer); + if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) + svc_i3c_master_dequeue_xfer(master, xfer); + mutex_unlock(&master->lock); + + ret = xfer->ret; + kfree(buf); + svc_i3c_master_free_xfer(xfer); + + return ret; +} + +static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master, + struct i3c_ccc_cmd *ccc) +{ + unsigned int xfer_len = ccc->dests[0].payload.len; + unsigned int read_len = ccc->rnw ? xfer_len : 0; + struct svc_i3c_xfer *xfer; + struct svc_i3c_cmd *cmd; + int ret; + + xfer = svc_i3c_master_alloc_xfer(master, 2); + if (!xfer) + return -ENOMEM; + + xfer->type = SVC_I3C_MCTRL_TYPE_I3C; + + /* Broadcasted message */ + cmd = &xfer->cmds[0]; + cmd->addr = I3C_BROADCAST_ADDR; + cmd->rnw = 0; + cmd->in = NULL; + cmd->out = &ccc->id; + cmd->len = 1; + cmd->read_len = 0; + cmd->continued = true; + + /* Directed message */ + cmd = &xfer->cmds[1]; + cmd->addr = ccc->dests[0].addr; + cmd->rnw = ccc->rnw; + cmd->in = ccc->rnw ? ccc->dests[0].payload.data : NULL; + cmd->out = ccc->rnw ? NULL : ccc->dests[0].payload.data, + cmd->len = xfer_len; + cmd->read_len = read_len; + cmd->continued = false; + + mutex_lock(&master->lock); + svc_i3c_master_enqueue_xfer(master, xfer); + if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) + svc_i3c_master_dequeue_xfer(master, xfer); + mutex_unlock(&master->lock); + + if (cmd->read_len != xfer_len) + ccc->dests[0].payload.len = cmd->read_len; + + ret = xfer->ret; + svc_i3c_master_free_xfer(xfer); + + return ret; +} + +static int svc_i3c_master_send_ccc_cmd(struct i3c_master_controller *m, + struct i3c_ccc_cmd *cmd) +{ + struct svc_i3c_master *master = to_svc_i3c_master(m); + bool broadcast = cmd->id < 0x80; + int ret; + + if (broadcast) + ret = svc_i3c_master_send_bdcast_ccc_cmd(master, cmd); + else + ret = svc_i3c_master_send_direct_ccc_cmd(master, cmd); + + if (ret) + cmd->err = I3C_ERROR_M2; + + return ret; +} + +static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev, + struct i3c_priv_xfer *xfers, + int nxfers) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + struct svc_i3c_xfer *xfer; + int ret, i; + + xfer = svc_i3c_master_alloc_xfer(master, nxfers); + if (!xfer) + return -ENOMEM; + + xfer->type = SVC_I3C_MCTRL_TYPE_I3C; + + for (i = 0; i < nxfers; i++) { + struct svc_i3c_cmd *cmd = &xfer->cmds[i]; + + cmd->addr = master->addrs[data->index]; + cmd->rnw = xfers[i].rnw; + cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL; + cmd->out = xfers[i].rnw ? NULL : xfers[i].data.out; + cmd->len = xfers[i].len; + cmd->read_len = xfers[i].rnw ? xfers[i].len : 0; + cmd->continued = (i + 1) < nxfers; + } + + mutex_lock(&master->lock); + svc_i3c_master_enqueue_xfer(master, xfer); + if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) + svc_i3c_master_dequeue_xfer(master, xfer); + mutex_unlock(&master->lock); + + ret = xfer->ret; + svc_i3c_master_free_xfer(xfer); + + return ret; +} + +static int svc_i3c_master_i2c_xfers(struct i2c_dev_desc *dev, + const struct i2c_msg *xfers, + int nxfers) +{ + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev); + struct svc_i3c_xfer *xfer; + int ret, i; + + xfer = svc_i3c_master_alloc_xfer(master, nxfers); + if (!xfer) + return -ENOMEM; + + xfer->type = SVC_I3C_MCTRL_TYPE_I2C; + + for (i = 0; i < nxfers; i++) { + struct svc_i3c_cmd *cmd = &xfer->cmds[i]; + + cmd->addr = master->addrs[data->index]; + cmd->rnw = xfers[i].flags & I2C_M_RD; + cmd->in = cmd->rnw ? xfers[i].buf : NULL; + cmd->out = cmd->rnw ? NULL : xfers[i].buf; + cmd->len = xfers[i].len; + cmd->read_len = cmd->rnw ? xfers[i].len : 0; + cmd->continued = (i + 1 < nxfers); + } + + mutex_lock(&master->lock); + svc_i3c_master_enqueue_xfer(master, xfer); + if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) + svc_i3c_master_dequeue_xfer(master, xfer); + mutex_unlock(&master->lock); + + ret = xfer->ret; + svc_i3c_master_free_xfer(xfer); + + return ret; +} + +static int svc_i3c_master_request_ibi(struct i3c_dev_desc *dev, + const struct i3c_ibi_setup *req) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + unsigned long flags; + unsigned int i; + + if (dev->ibi->max_payload_len > SVC_I3C_FIFO_SIZE) { + dev_err(master->dev, "IBI max payload %d should be < %d\n", + dev->ibi->max_payload_len, SVC_I3C_FIFO_SIZE); + return -ERANGE; + } + + data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req); + if (IS_ERR(data->ibi_pool)) + return PTR_ERR(data->ibi_pool); + + spin_lock_irqsave(&master->ibi.lock, flags); + for (i = 0; i < master->ibi.num_slots; i++) { + if (!master->ibi.slots[i]) { + data->ibi = i; + master->ibi.slots[i] = dev; + break; + } + } + spin_unlock_irqrestore(&master->ibi.lock, flags); + + if (i < master->ibi.num_slots) + return 0; + + i3c_generic_ibi_free_pool(data->ibi_pool); + data->ibi_pool = NULL; + + return -ENOSPC; +} + +static void svc_i3c_master_free_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + unsigned long flags; + + spin_lock_irqsave(&master->ibi.lock, flags); + master->ibi.slots[data->ibi] = NULL; + data->ibi = -1; + spin_unlock_irqrestore(&master->ibi.lock, flags); + + i3c_generic_ibi_free_pool(data->ibi_pool); +} + +static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + int ret; + + ret = pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); + return ret; + } + + svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); + + return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); +} + +static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct svc_i3c_master *master = to_svc_i3c_master(m); + int ret; + + svc_i3c_master_disable_interrupts(master); + + ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); + + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); + + return ret; +} + +static void svc_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev, + struct i3c_ibi_slot *slot) +{ + struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + + i3c_generic_ibi_recycle_slot(data->ibi_pool, slot); +} + +static const struct i3c_master_controller_ops svc_i3c_master_ops = { + .bus_init = svc_i3c_master_bus_init, + .bus_cleanup = svc_i3c_master_bus_cleanup, + .attach_i3c_dev = svc_i3c_master_attach_i3c_dev, + .detach_i3c_dev = svc_i3c_master_detach_i3c_dev, + .reattach_i3c_dev = svc_i3c_master_reattach_i3c_dev, + .attach_i2c_dev = svc_i3c_master_attach_i2c_dev, + .detach_i2c_dev = svc_i3c_master_detach_i2c_dev, + .do_daa = svc_i3c_master_do_daa, + .supports_ccc_cmd = svc_i3c_master_supports_ccc_cmd, + .send_ccc_cmd = svc_i3c_master_send_ccc_cmd, + .priv_xfers = svc_i3c_master_priv_xfers, + .i2c_xfers = svc_i3c_master_i2c_xfers, + .request_ibi = svc_i3c_master_request_ibi, + .free_ibi = svc_i3c_master_free_ibi, + .recycle_ibi_slot = svc_i3c_master_recycle_ibi_slot, + .enable_ibi = svc_i3c_master_enable_ibi, + .disable_ibi = svc_i3c_master_disable_ibi, +}; + +static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master) +{ + int ret = 0; + + ret = clk_prepare_enable(master->pclk); + if (ret) + return ret; + + ret = clk_prepare_enable(master->fclk); + if (ret) { + clk_disable_unprepare(master->pclk); + return ret; + } + + ret = clk_prepare_enable(master->sclk); + if (ret) { + clk_disable_unprepare(master->pclk); + clk_disable_unprepare(master->fclk); + return ret; + } + + return 0; +} + +static void svc_i3c_master_unprepare_clks(struct svc_i3c_master *master) +{ + clk_disable_unprepare(master->pclk); + clk_disable_unprepare(master->fclk); + clk_disable_unprepare(master->sclk); +} + +static int svc_i3c_master_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct svc_i3c_master *master; + int ret; + + master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); + if (!master) + return -ENOMEM; + + master->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(master->regs)) + return PTR_ERR(master->regs); + + master->pclk = devm_clk_get(dev, "pclk"); + if (IS_ERR(master->pclk)) + return PTR_ERR(master->pclk); + + master->fclk = devm_clk_get(dev, "fast_clk"); + if (IS_ERR(master->fclk)) + return PTR_ERR(master->fclk); + + master->sclk = devm_clk_get(dev, "slow_clk"); + if (IS_ERR(master->sclk)) + return PTR_ERR(master->sclk); + + master->irq = platform_get_irq(pdev, 0); + if (master->irq < 0) + return master->irq; + + master->dev = dev; + + ret = svc_i3c_master_prepare_clks(master); + if (ret) + return ret; + + INIT_WORK(&master->hj_work, svc_i3c_master_hj_work); + INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work); + mutex_init(&master->lock); + + ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler, + IRQF_NO_SUSPEND, "svc-i3c-irq", master); + if (ret) + goto err_disable_clks; + + master->free_slots = GENMASK(SVC_I3C_MAX_DEVS - 1, 0); + + spin_lock_init(&master->xferqueue.lock); + INIT_LIST_HEAD(&master->xferqueue.list); + + spin_lock_init(&master->ibi.lock); + master->ibi.num_slots = SVC_I3C_MAX_DEVS; + master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots, + sizeof(*master->ibi.slots), + GFP_KERNEL); + if (!master->ibi.slots) { + ret = -ENOMEM; + goto err_disable_clks; + } + + platform_set_drvdata(pdev, master); + + pm_runtime_set_autosuspend_delay(&pdev->dev, SVC_I3C_PM_TIMEOUT_MS); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + svc_i3c_master_reset(master); + + /* Register the master */ + ret = i3c_master_register(&master->base, &pdev->dev, + &svc_i3c_master_ops, false); + if (ret) + goto rpm_disable; + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + + return 0; + +rpm_disable: + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); + +err_disable_clks: + svc_i3c_master_unprepare_clks(master); + + return ret; +} + +static void svc_i3c_master_remove(struct platform_device *pdev) +{ + struct svc_i3c_master *master = platform_get_drvdata(pdev); + + i3c_master_unregister(&master->base); + + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_disable(&pdev->dev); +} + +static void svc_i3c_save_regs(struct svc_i3c_master *master) +{ + master->saved_regs.mconfig = readl(master->regs + SVC_I3C_MCONFIG); + master->saved_regs.mdynaddr = readl(master->regs + SVC_I3C_MDYNADDR); +} + +static void svc_i3c_restore_regs(struct svc_i3c_master *master) +{ + if (readl(master->regs + SVC_I3C_MDYNADDR) != + master->saved_regs.mdynaddr) { + writel(master->saved_regs.mconfig, + master->regs + SVC_I3C_MCONFIG); + writel(master->saved_regs.mdynaddr, + master->regs + SVC_I3C_MDYNADDR); + } +} + +static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev) +{ + struct svc_i3c_master *master = dev_get_drvdata(dev); + + svc_i3c_save_regs(master); + svc_i3c_master_unprepare_clks(master); + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int __maybe_unused svc_i3c_runtime_resume(struct device *dev) +{ + struct svc_i3c_master *master = dev_get_drvdata(dev); + + pinctrl_pm_select_default_state(dev); + svc_i3c_master_prepare_clks(master); + + svc_i3c_restore_regs(master); + + return 0; +} + +static const struct dev_pm_ops svc_i3c_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(svc_i3c_runtime_suspend, + svc_i3c_runtime_resume, NULL) +}; + +static const struct of_device_id svc_i3c_master_of_match_tbl[] = { + { .compatible = "silvaco,i3c-master" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, svc_i3c_master_of_match_tbl); + +static struct platform_driver svc_i3c_master = { + .probe = svc_i3c_master_probe, + .remove_new = svc_i3c_master_remove, + .driver = { + .name = "silvaco-i3c-master", + .of_match_table = svc_i3c_master_of_match_tbl, + .pm = &svc_i3c_pm_ops, + }, +}; +module_platform_driver(svc_i3c_master); + +MODULE_AUTHOR("Conor Culhane <conor.culhane@silvaco.com>"); +MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>"); +MODULE_DESCRIPTION("Silvaco dual-role I3C master driver"); +MODULE_LICENSE("GPL v2"); |