* [PATCH v5 5/6] i3c: master: svc: Add Silvaco I3C master driver
2021-01-21 10:18 [PATCH v5 0/6] Silvaco I3C master driver Miquel Raynal
` (3 preceding siblings ...)
2021-01-21 10:18 ` [PATCH v5 4/6] dt-bindings: i3c: Describe Silvaco master binding Miquel Raynal
@ 2021-01-21 10:18 ` Miquel Raynal
2021-01-21 10:18 ` [PATCH v5 6/6] MAINTAINERS: Add Silvaco I3C master Miquel Raynal
2021-02-05 23:44 ` [PATCH v5 0/6] Silvaco I3C master driver Alexandre Belloni
6 siblings, 0 replies; 10+ messages in thread
From: Miquel Raynal @ 2021-01-21 10:18 UTC (permalink / raw)
To: Alexandre Belloni, linux-i3c, Rob Herring, devicetree
Cc: Miquel Raynal, Rajeev Huralikoppi, Conor Culhane,
Thomas Petazzoni, Nicolas Pitre
Add support for Silvaco I3C dual-role IP. The master role is supported
in SDR mode only. I2C transfers have not been tested but are shared
because they are very close to the I3C transfers in terms of register
configuration.
The IBI processing follows this logic:
- When a slave advertizes an interrupt (SDA pulled low) an interrupt
gets generated by the master. This time is unbounded and may be
deferred.
- The IRQ handler itself does not process anything: it only queues a
work that will be run in non-atomic context. This is needed because
short wait periods must be experienced.
- The IBI job is divided in two parts: the first one is "critical" in
the sense that it may not support getting interrupted. If this
happens, after this first section the driver checks the master error
register and depending on its content either flushes everything and
errors out, or ends the processing (this second section may be
interrupted).
- If the critical section got interrupted, the slave will
automatically respin it's IBI request when it will be allowed to.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/i3c/master/Kconfig | 8 +
drivers/i3c/master/Makefile | 1 +
drivers/i3c/master/svc-i3c-master.c | 1478 +++++++++++++++++++++++++++
3 files changed, 1487 insertions(+)
create mode 100644 drivers/i3c/master/svc-i3c-master.c
diff --git a/drivers/i3c/master/Kconfig b/drivers/i3c/master/Kconfig
index e68f15f4b4d0..eb6ac7aa307b 100644
--- a/drivers/i3c/master/Kconfig
+++ b/drivers/i3c/master/Kconfig
@@ -22,6 +22,14 @@ config DW_I3C_MASTER
This driver can also be built as a module. If so, the module
will be called dw-i3c-master.
+config SVC_I3C_MASTER
+ tristate "Silvaco I3C Dual-Role Master driver"
+ depends on I3C
+ depends on HAS_IOMEM
+ depends on !(ALPHA || PARISC)
+ help
+ Support for Silvaco I3C Dual-Role Master Controller.
+
config MIPI_I3C_HCI
tristate "MIPI I3C Host Controller Interface driver (EXPERIMENTAL)"
depends on I3C
diff --git a/drivers/i3c/master/Makefile b/drivers/i3c/master/Makefile
index b892fd4cafad..b3fee0f690b2 100644
--- a/drivers/i3c/master/Makefile
+++ b/drivers/i3c/master/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_CDNS_I3C_MASTER) += i3c-master-cdns.o
obj-$(CONFIG_DW_I3C_MASTER) += dw-i3c-master.o
+obj-$(CONFIG_SVC_I3C_MASTER) += svc-i3c-master.o
obj-$(CONFIG_MIPI_I3C_HCI) += mipi-i3c-hci/
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
new file mode 100644
index 000000000000..8d990696676e
--- /dev/null
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -0,0 +1,1478 @@
+// 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/platform_device.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_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
+
+/* 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_master - Silvaco I3C Master structure
+ * @base: I3C master controller
+ * @dev: Corresponding device
+ * @regs: Memory mapping
+ * @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
+ */
+struct svc_i3c_master {
+ struct i3c_master_controller base;
+ struct device *dev;
+ void __iomem *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 svc_i3c_i3c_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);
+ 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 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 void svc_i3c_master_clear_merrwarn(struct svc_i3c_master *master)
+{
+ writel(readl(master->regs + SVC_I3C_MERRWARN),
+ master->regs + SVC_I3C_MERRWARN);
+}
+
+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;
+ u8 *buf;
+
+ slot = i3c_generic_ibi_get_free_slot(data->ibi_pool);
+ if (!slot)
+ return -ENOSPC;
+
+ slot->len = 0;
+ buf = slot->data;
+
+ 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;
+
+ /* 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");
+ 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);
+}
+
+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_MINTMASKED);
+
+ 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, i2cbaud, reg;
+ int ret;
+
+ /* Timings derivation */
+ fclk_rate = clk_get_rate(master->fclk);
+ if (!fclk_rate)
+ return -EINVAL;
+
+ 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;
+ 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;
+ 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;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ reg = SVC_I3C_MCONFIG_MASTER_EN |
+ SVC_I3C_MCONFIG_DISTO(0) |
+ SVC_I3C_MCONFIG_HKEEP(0) |
+ SVC_I3C_MCONFIG_ODSTOP(0) |
+ 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)
+ return ret;
+
+ 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)
+ return ret;
+
+ svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
+
+ return 0;
+}
+
+static void svc_i3c_master_bus_cleanup(struct i3c_master_controller *m)
+{
+ struct svc_i3c_master *master = to_svc_i3c_master(m);
+
+ svc_i3c_master_disable_interrupts(master);
+
+ /* Disable master */
+ writel(0, master->regs + SVC_I3C_MCONFIG);
+}
+
+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(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(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)) {
+ /*
+ * 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(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;
+
+ 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)
+ goto emit_stop;
+
+ /* 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)
+ return ret;
+ }
+
+ /* Configure IBI auto-rules */
+ ret = svc_i3c_update_ibirules(master);
+ if (ret) {
+ dev_err(master->dev, "Cannot handle such a list of devices");
+ return ret;
+ }
+
+ return 0;
+
+emit_stop:
+ svc_i3c_master_emit_stop(master);
+ svc_i3c_master_clear_merrwarn(master);
+
+ return ret;
+}
+
+static int svc_i3c_master_read(struct svc_i3c_master *master,
+ u8 *in, unsigned int len)
+{
+ int offset = 0, i, ret;
+ u32 mdctrl;
+
+ while (offset < len) {
+ unsigned int count;
+
+ ret = readl_poll_timeout(master->regs + SVC_I3C_MDATACTRL,
+ mdctrl,
+ !(mdctrl & SVC_I3C_MDATACTRL_RXEMPTY),
+ 0, 1000);
+ if (ret)
+ return ret;
+
+ count = SVC_I3C_MDATACTRL_RXCOUNT(mdctrl);
+ for (i = 0; i < count; i++)
+ in[offset + i] = readl(master->regs + SVC_I3C_MRDATAB);
+
+ offset += count;
+ }
+
+ return 0;
+}
+
+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;
+
+ 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 (rnw)
+ ret = svc_i3c_master_read(master, in, xfer_len);
+ else
+ ret = svc_i3c_master_write(master, out, xfer_len);
+ if (ret)
+ goto emit_stop;
+
+ ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
+ SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000);
+ if (ret)
+ goto emit_stop;
+
+ if (!continued)
+ svc_i3c_master_emit_stop(master);
+
+ 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;
+
+ 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;
+
+ 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);
+}
+
+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;
+
+ 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);
+
+ 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 = xfer_len;
+ 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;
+
+ 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);
+
+ 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;
+
+ if (broadcast)
+ return svc_i3c_master_send_bdcast_ccc_cmd(master, cmd);
+ else
+ return svc_i3c_master_send_direct_ccc_cmd(master, cmd);
+}
+
+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;
+ }
+
+ 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);
+
+ 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);
+ }
+
+ 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);
+
+ 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);
+
+ 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);
+
+ return i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
+}
+
+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 void svc_i3c_master_reset(struct svc_i3c_master *master)
+{
+ u32 reg;
+
+ /* Clear pending warnings */
+ writel(readl(master->regs + SVC_I3C_MERRWARN),
+ master->regs + SVC_I3C_MERRWARN);
+
+ /* 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);
+
+ svc_i3c_master_disable_interrupts(master);
+}
+
+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 -ENOENT;
+
+ master->dev = dev;
+
+ svc_i3c_master_reset(master);
+
+ ret = clk_prepare_enable(master->pclk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(master->fclk);
+ if (ret)
+ goto err_disable_pclk;
+
+ ret = clk_prepare_enable(master->sclk);
+ if (ret)
+ goto err_disable_fclk;
+
+ INIT_WORK(&master->hj_work, svc_i3c_master_hj_work);
+ INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work);
+ ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler,
+ IRQF_NO_SUSPEND, "svc-i3c-irq", master);
+ if (ret)
+ goto err_disable_sclk;
+
+ 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_sclk;
+ }
+
+ platform_set_drvdata(pdev, master);
+
+ /* Register the master */
+ ret = i3c_master_register(&master->base, &pdev->dev,
+ &svc_i3c_master_ops, false);
+ if (ret)
+ goto err_disable_sclk;
+
+ return 0;
+
+err_disable_sclk:
+ clk_disable_unprepare(master->sclk);
+
+err_disable_fclk:
+ clk_disable_unprepare(master->fclk);
+
+err_disable_pclk:
+ clk_disable_unprepare(master->pclk);
+
+ return ret;
+}
+
+static int svc_i3c_master_remove(struct platform_device *pdev)
+{
+ struct svc_i3c_master *master = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = i3c_master_unregister(&master->base);
+ if (ret)
+ return ret;
+
+ free_irq(master->irq, master);
+ clk_disable_unprepare(master->pclk);
+ clk_disable_unprepare(master->fclk);
+ clk_disable_unprepare(master->sclk);
+
+ return 0;
+}
+
+static const struct of_device_id svc_i3c_master_of_match_tbl[] = {
+ { .compatible = "silvaco,i3c-master" },
+ { /* sentinel */ },
+};
+
+static struct platform_driver svc_i3c_master = {
+ .probe = svc_i3c_master_probe,
+ .remove = svc_i3c_master_remove,
+ .driver = {
+ .name = "silvaco-i3c-master",
+ .of_match_table = svc_i3c_master_of_match_tbl,
+ },
+};
+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");
--
2.20.1
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