diff options
Diffstat (limited to 'drivers/i3c/master/mipi-i3c-hci/core.c')
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/core.c | 793 |
1 files changed, 793 insertions, 0 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c new file mode 100644 index 000000000..6aef5ce43 --- /dev/null +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -0,0 +1,793 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* + * Copyright (c) 2020, MIPI Alliance, Inc. + * + * Author: Nicolas Pitre <npitre@baylibre.com> + * + * Core driver code with main interface to the I3C subsystem. + */ + +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/i3c/master.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include "hci.h" +#include "ext_caps.h" +#include "cmd.h" +#include "dat.h" + + +/* + * Host Controller Capabilities and Operation Registers + */ + +#define reg_read(r) readl(hci->base_regs + (r)) +#define reg_write(r, v) writel(v, hci->base_regs + (r)) +#define reg_set(r, v) reg_write(r, reg_read(r) | (v)) +#define reg_clear(r, v) reg_write(r, reg_read(r) & ~(v)) + +#define HCI_VERSION 0x00 /* HCI Version (in BCD) */ + +#define HC_CONTROL 0x04 +#define HC_CONTROL_BUS_ENABLE BIT(31) +#define HC_CONTROL_RESUME BIT(30) +#define HC_CONTROL_ABORT BIT(29) +#define HC_CONTROL_HALT_ON_CMD_TIMEOUT BIT(12) +#define HC_CONTROL_HOT_JOIN_CTRL BIT(8) /* Hot-Join ACK/NACK Control */ +#define HC_CONTROL_I2C_TARGET_PRESENT BIT(7) +#define HC_CONTROL_PIO_MODE BIT(6) /* DMA/PIO Mode Selector */ +#define HC_CONTROL_DATA_BIG_ENDIAN BIT(4) +#define HC_CONTROL_IBA_INCLUDE BIT(0) /* Include I3C Broadcast Address */ + +#define MASTER_DEVICE_ADDR 0x08 /* Master Device Address */ +#define MASTER_DYNAMIC_ADDR_VALID BIT(31) /* Dynamic Address is Valid */ +#define MASTER_DYNAMIC_ADDR(v) FIELD_PREP(GENMASK(22, 16), v) + +#define HC_CAPABILITIES 0x0c +#define HC_CAP_SG_DC_EN BIT(30) +#define HC_CAP_SG_IBI_EN BIT(29) +#define HC_CAP_SG_CR_EN BIT(28) +#define HC_CAP_MAX_DATA_LENGTH GENMASK(24, 22) +#define HC_CAP_CMD_SIZE GENMASK(21, 20) +#define HC_CAP_DIRECT_COMMANDS_EN BIT(18) +#define HC_CAP_MULTI_LANE_EN BIT(15) +#define HC_CAP_CMD_CCC_DEFBYTE BIT(10) +#define HC_CAP_HDR_BT_EN BIT(8) +#define HC_CAP_HDR_TS_EN BIT(7) +#define HC_CAP_HDR_DDR_EN BIT(6) +#define HC_CAP_NON_CURRENT_MASTER_CAP BIT(5) /* master handoff capable */ +#define HC_CAP_DATA_BYTE_CFG_EN BIT(4) /* endian selection possible */ +#define HC_CAP_AUTO_COMMAND BIT(3) +#define HC_CAP_COMBO_COMMAND BIT(2) + +#define RESET_CONTROL 0x10 +#define BUS_RESET BIT(31) +#define BUS_RESET_TYPE GENMASK(30, 29) +#define IBI_QUEUE_RST BIT(5) +#define RX_FIFO_RST BIT(4) +#define TX_FIFO_RST BIT(3) +#define RESP_QUEUE_RST BIT(2) +#define CMD_QUEUE_RST BIT(1) +#define SOFT_RST BIT(0) /* Core Reset */ + +#define PRESENT_STATE 0x14 +#define STATE_CURRENT_MASTER BIT(2) + +#define INTR_STATUS 0x20 +#define INTR_STATUS_ENABLE 0x24 +#define INTR_SIGNAL_ENABLE 0x28 +#define INTR_FORCE 0x2c +#define INTR_HC_CMD_SEQ_UFLOW_STAT BIT(12) /* Cmd Sequence Underflow */ +#define INTR_HC_RESET_CANCEL BIT(11) /* HC Cancelled Reset */ +#define INTR_HC_INTERNAL_ERR BIT(10) /* HC Internal Error */ +#define INTR_HC_PIO BIT(8) /* cascaded PIO interrupt */ +#define INTR_HC_RINGS GENMASK(7, 0) + +#define DAT_SECTION 0x30 /* Device Address Table */ +#define DAT_ENTRY_SIZE GENMASK(31, 28) +#define DAT_TABLE_SIZE GENMASK(18, 12) +#define DAT_TABLE_OFFSET GENMASK(11, 0) + +#define DCT_SECTION 0x34 /* Device Characteristics Table */ +#define DCT_ENTRY_SIZE GENMASK(31, 28) +#define DCT_TABLE_INDEX GENMASK(23, 19) +#define DCT_TABLE_SIZE GENMASK(18, 12) +#define DCT_TABLE_OFFSET GENMASK(11, 0) + +#define RING_HEADERS_SECTION 0x38 +#define RING_HEADERS_OFFSET GENMASK(15, 0) + +#define PIO_SECTION 0x3c +#define PIO_REGS_OFFSET GENMASK(15, 0) /* PIO Offset */ + +#define EXT_CAPS_SECTION 0x40 +#define EXT_CAPS_OFFSET GENMASK(15, 0) + +#define IBI_NOTIFY_CTRL 0x58 /* IBI Notify Control */ +#define IBI_NOTIFY_SIR_REJECTED BIT(3) /* Rejected Target Interrupt Request */ +#define IBI_NOTIFY_MR_REJECTED BIT(1) /* Rejected Master Request Control */ +#define IBI_NOTIFY_HJ_REJECTED BIT(0) /* Rejected Hot-Join Control */ + +#define DEV_CTX_BASE_LO 0x60 +#define DEV_CTX_BASE_HI 0x64 + + +static inline struct i3c_hci *to_i3c_hci(struct i3c_master_controller *m) +{ + return container_of(m, struct i3c_hci, master); +} + +static int i3c_hci_bus_init(struct i3c_master_controller *m) +{ + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_device_info info; + int ret; + + DBG(""); + + if (hci->cmd == &mipi_i3c_hci_cmd_v1) { + ret = mipi_i3c_hci_dat_v1.init(hci); + if (ret) + return ret; + } + + ret = i3c_master_get_free_addr(m, 0); + if (ret < 0) + return ret; + reg_write(MASTER_DEVICE_ADDR, + MASTER_DYNAMIC_ADDR(ret) | MASTER_DYNAMIC_ADDR_VALID); + memset(&info, 0, sizeof(info)); + info.dyn_addr = ret; + ret = i3c_master_set_info(m, &info); + if (ret) + return ret; + + ret = hci->io->init(hci); + if (ret) + return ret; + + reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE); + DBG("HC_CONTROL = %#x", reg_read(HC_CONTROL)); + + return 0; +} + +static void i3c_hci_bus_cleanup(struct i3c_master_controller *m) +{ + struct i3c_hci *hci = to_i3c_hci(m); + + DBG(""); + + reg_clear(HC_CONTROL, HC_CONTROL_BUS_ENABLE); + hci->io->cleanup(hci); + if (hci->cmd == &mipi_i3c_hci_cmd_v1) + mipi_i3c_hci_dat_v1.cleanup(hci); +} + +void mipi_i3c_hci_resume(struct i3c_hci *hci) +{ + /* the HC_CONTROL_RESUME bit is R/W1C so just read and write back */ + reg_write(HC_CONTROL, reg_read(HC_CONTROL)); +} + +/* located here rather than pio.c because needed bits are in core reg space */ +void mipi_i3c_hci_pio_reset(struct i3c_hci *hci) +{ + reg_write(RESET_CONTROL, RX_FIFO_RST | TX_FIFO_RST | RESP_QUEUE_RST); +} + +/* located here rather than dct.c because needed bits are in core reg space */ +void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci) +{ + reg_write(DCT_SECTION, FIELD_PREP(DCT_TABLE_INDEX, 0)); +} + +static int i3c_hci_send_ccc_cmd(struct i3c_master_controller *m, + struct i3c_ccc_cmd *ccc) +{ + struct i3c_hci *hci = to_i3c_hci(m); + struct hci_xfer *xfer; + bool raw = !!(hci->quirks & HCI_QUIRK_RAW_CCC); + bool prefixed = raw && !!(ccc->id & I3C_CCC_DIRECT); + unsigned int nxfers = ccc->ndests + prefixed; + DECLARE_COMPLETION_ONSTACK(done); + int i, last, ret = 0; + + DBG("cmd=%#x rnw=%d ndests=%d data[0].len=%d", + ccc->id, ccc->rnw, ccc->ndests, ccc->dests[0].payload.len); + + xfer = hci_alloc_xfer(nxfers); + if (!xfer) + return -ENOMEM; + + if (prefixed) { + xfer->data = NULL; + xfer->data_len = 0; + xfer->rnw = false; + hci->cmd->prep_ccc(hci, xfer, I3C_BROADCAST_ADDR, + ccc->id, true); + xfer++; + } + + for (i = 0; i < nxfers - prefixed; i++) { + xfer[i].data = ccc->dests[i].payload.data; + xfer[i].data_len = ccc->dests[i].payload.len; + xfer[i].rnw = ccc->rnw; + ret = hci->cmd->prep_ccc(hci, &xfer[i], ccc->dests[i].addr, + ccc->id, raw); + if (ret) + goto out; + xfer[i].cmd_desc[0] |= CMD_0_ROC; + } + last = i - 1; + xfer[last].cmd_desc[0] |= CMD_0_TOC; + xfer[last].completion = &done; + + if (prefixed) + xfer--; + + ret = hci->io->queue_xfer(hci, xfer, nxfers); + if (ret) + goto out; + if (!wait_for_completion_timeout(&done, HZ) && + hci->io->dequeue_xfer(hci, xfer, nxfers)) { + ret = -ETIME; + goto out; + } + for (i = prefixed; i < nxfers; i++) { + if (ccc->rnw) + ccc->dests[i - prefixed].payload.len = + RESP_DATA_LENGTH(xfer[i].response); + if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) { + ret = -EIO; + goto out; + } + } + + if (ccc->rnw) + DBG("got: %*ph", + ccc->dests[0].payload.len, ccc->dests[0].payload.data); + +out: + hci_free_xfer(xfer, nxfers); + return ret; +} + +static int i3c_hci_daa(struct i3c_master_controller *m) +{ + struct i3c_hci *hci = to_i3c_hci(m); + + DBG(""); + + return hci->cmd->perform_daa(hci); +} + +static int i3c_hci_priv_xfers(struct i3c_dev_desc *dev, + struct i3c_priv_xfer *i3c_xfers, + int nxfers) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct hci_xfer *xfer; + DECLARE_COMPLETION_ONSTACK(done); + unsigned int size_limit; + int i, last, ret = 0; + + DBG("nxfers = %d", nxfers); + + xfer = hci_alloc_xfer(nxfers); + if (!xfer) + return -ENOMEM; + + size_limit = 1U << (16 + FIELD_GET(HC_CAP_MAX_DATA_LENGTH, hci->caps)); + + for (i = 0; i < nxfers; i++) { + xfer[i].data_len = i3c_xfers[i].len; + ret = -EFBIG; + if (xfer[i].data_len >= size_limit) + goto out; + xfer[i].rnw = i3c_xfers[i].rnw; + if (i3c_xfers[i].rnw) { + xfer[i].data = i3c_xfers[i].data.in; + } else { + /* silence the const qualifier warning with a cast */ + xfer[i].data = (void *) i3c_xfers[i].data.out; + } + hci->cmd->prep_i3c_xfer(hci, dev, &xfer[i]); + xfer[i].cmd_desc[0] |= CMD_0_ROC; + } + last = i - 1; + xfer[last].cmd_desc[0] |= CMD_0_TOC; + xfer[last].completion = &done; + + ret = hci->io->queue_xfer(hci, xfer, nxfers); + if (ret) + goto out; + if (!wait_for_completion_timeout(&done, HZ) && + hci->io->dequeue_xfer(hci, xfer, nxfers)) { + ret = -ETIME; + goto out; + } + for (i = 0; i < nxfers; i++) { + if (i3c_xfers[i].rnw) + i3c_xfers[i].len = RESP_DATA_LENGTH(xfer[i].response); + if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) { + ret = -EIO; + goto out; + } + } + +out: + hci_free_xfer(xfer, nxfers); + return ret; +} + +static int i3c_hci_i2c_xfers(struct i2c_dev_desc *dev, + const struct i2c_msg *i2c_xfers, int nxfers) +{ + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct hci_xfer *xfer; + DECLARE_COMPLETION_ONSTACK(done); + int i, last, ret = 0; + + DBG("nxfers = %d", nxfers); + + xfer = hci_alloc_xfer(nxfers); + if (!xfer) + return -ENOMEM; + + for (i = 0; i < nxfers; i++) { + xfer[i].data = i2c_xfers[i].buf; + xfer[i].data_len = i2c_xfers[i].len; + xfer[i].rnw = i2c_xfers[i].flags & I2C_M_RD; + hci->cmd->prep_i2c_xfer(hci, dev, &xfer[i]); + xfer[i].cmd_desc[0] |= CMD_0_ROC; + } + last = i - 1; + xfer[last].cmd_desc[0] |= CMD_0_TOC; + xfer[last].completion = &done; + + ret = hci->io->queue_xfer(hci, xfer, nxfers); + if (ret) + goto out; + if (!wait_for_completion_timeout(&done, HZ) && + hci->io->dequeue_xfer(hci, xfer, nxfers)) { + ret = -ETIME; + goto out; + } + for (i = 0; i < nxfers; i++) { + if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) { + ret = -EIO; + goto out; + } + } + +out: + hci_free_xfer(xfer, nxfers); + return ret; +} + +static int i3c_hci_attach_i3c_dev(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data; + int ret; + + DBG(""); + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return -ENOMEM; + if (hci->cmd == &mipi_i3c_hci_cmd_v1) { + ret = mipi_i3c_hci_dat_v1.alloc_entry(hci); + if (ret < 0) { + kfree(dev_data); + return ret; + } + mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, ret, dev->info.dyn_addr); + dev_data->dat_idx = ret; + } + i3c_dev_set_master_data(dev, dev_data); + return 0; +} + +static int i3c_hci_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 old_dyn_addr) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev); + + DBG(""); + + if (hci->cmd == &mipi_i3c_hci_cmd_v1) + mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, dev_data->dat_idx, + dev->info.dyn_addr); + return 0; +} + +static void i3c_hci_detach_i3c_dev(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev); + + DBG(""); + + i3c_dev_set_master_data(dev, NULL); + if (hci->cmd == &mipi_i3c_hci_cmd_v1) + mipi_i3c_hci_dat_v1.free_entry(hci, dev_data->dat_idx); + kfree(dev_data); +} + +static int i3c_hci_attach_i2c_dev(struct i2c_dev_desc *dev) +{ + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data; + int ret; + + DBG(""); + + if (hci->cmd != &mipi_i3c_hci_cmd_v1) + return 0; + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return -ENOMEM; + ret = mipi_i3c_hci_dat_v1.alloc_entry(hci); + if (ret < 0) { + kfree(dev_data); + return ret; + } + mipi_i3c_hci_dat_v1.set_static_addr(hci, ret, dev->addr); + mipi_i3c_hci_dat_v1.set_flags(hci, ret, DAT_0_I2C_DEVICE, 0); + dev_data->dat_idx = ret; + i2c_dev_set_master_data(dev, dev_data); + return 0; +} + +static void i3c_hci_detach_i2c_dev(struct i2c_dev_desc *dev) +{ + struct i3c_master_controller *m = i2c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i2c_dev_get_master_data(dev); + + DBG(""); + + if (dev_data) { + i2c_dev_set_master_data(dev, NULL); + if (hci->cmd == &mipi_i3c_hci_cmd_v1) + mipi_i3c_hci_dat_v1.free_entry(hci, dev_data->dat_idx); + kfree(dev_data); + } +} + +static int i3c_hci_request_ibi(struct i3c_dev_desc *dev, + const struct i3c_ibi_setup *req) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev); + unsigned int dat_idx = dev_data->dat_idx; + + if (req->max_payload_len != 0) + mipi_i3c_hci_dat_v1.set_flags(hci, dat_idx, DAT_0_IBI_PAYLOAD, 0); + else + mipi_i3c_hci_dat_v1.clear_flags(hci, dat_idx, DAT_0_IBI_PAYLOAD, 0); + return hci->io->request_ibi(hci, dev, req); +} + +static void i3c_hci_free_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + + hci->io->free_ibi(hci, dev); +} + +static int i3c_hci_enable_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev); + + mipi_i3c_hci_dat_v1.clear_flags(hci, dev_data->dat_idx, DAT_0_SIR_REJECT, 0); + return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); +} + +static int i3c_hci_disable_ibi(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev); + + mipi_i3c_hci_dat_v1.set_flags(hci, dev_data->dat_idx, DAT_0_SIR_REJECT, 0); + return i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); +} + +static void i3c_hci_recycle_ibi_slot(struct i3c_dev_desc *dev, + struct i3c_ibi_slot *slot) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct i3c_hci *hci = to_i3c_hci(m); + + hci->io->recycle_ibi_slot(hci, dev, slot); +} + +static const struct i3c_master_controller_ops i3c_hci_ops = { + .bus_init = i3c_hci_bus_init, + .bus_cleanup = i3c_hci_bus_cleanup, + .do_daa = i3c_hci_daa, + .send_ccc_cmd = i3c_hci_send_ccc_cmd, + .priv_xfers = i3c_hci_priv_xfers, + .i2c_xfers = i3c_hci_i2c_xfers, + .attach_i3c_dev = i3c_hci_attach_i3c_dev, + .reattach_i3c_dev = i3c_hci_reattach_i3c_dev, + .detach_i3c_dev = i3c_hci_detach_i3c_dev, + .attach_i2c_dev = i3c_hci_attach_i2c_dev, + .detach_i2c_dev = i3c_hci_detach_i2c_dev, + .request_ibi = i3c_hci_request_ibi, + .free_ibi = i3c_hci_free_ibi, + .enable_ibi = i3c_hci_enable_ibi, + .disable_ibi = i3c_hci_disable_ibi, + .recycle_ibi_slot = i3c_hci_recycle_ibi_slot, +}; + +static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id) +{ + struct i3c_hci *hci = dev_id; + irqreturn_t result = IRQ_NONE; + u32 val; + + val = reg_read(INTR_STATUS); + DBG("INTR_STATUS = %#x", val); + + if (val) { + reg_write(INTR_STATUS, val); + } else { + /* v1.0 does not have PIO cascaded notification bits */ + val |= INTR_HC_PIO; + } + + if (val & INTR_HC_RESET_CANCEL) { + DBG("cancelled reset"); + val &= ~INTR_HC_RESET_CANCEL; + } + if (val & INTR_HC_INTERNAL_ERR) { + dev_err(&hci->master.dev, "Host Controller Internal Error\n"); + val &= ~INTR_HC_INTERNAL_ERR; + } + if (val & INTR_HC_PIO) { + hci->io->irq_handler(hci, 0); + val &= ~INTR_HC_PIO; + } + if (val & INTR_HC_RINGS) { + hci->io->irq_handler(hci, val & INTR_HC_RINGS); + val &= ~INTR_HC_RINGS; + } + if (val) + dev_err(&hci->master.dev, "unexpected INTR_STATUS %#x\n", val); + else + result = IRQ_HANDLED; + + return result; +} + +static int i3c_hci_init(struct i3c_hci *hci) +{ + u32 regval, offset; + int ret; + + /* Validate HCI hardware version */ + regval = reg_read(HCI_VERSION); + hci->version_major = (regval >> 8) & 0xf; + hci->version_minor = (regval >> 4) & 0xf; + hci->revision = regval & 0xf; + dev_notice(&hci->master.dev, "MIPI I3C HCI v%u.%u r%02u\n", + hci->version_major, hci->version_minor, hci->revision); + /* known versions */ + switch (regval & ~0xf) { + case 0x100: /* version 1.0 */ + case 0x110: /* version 1.1 */ + case 0x200: /* version 2.0 */ + break; + default: + dev_err(&hci->master.dev, "unsupported HCI version\n"); + return -EPROTONOSUPPORT; + } + + hci->caps = reg_read(HC_CAPABILITIES); + DBG("caps = %#x", hci->caps); + + regval = reg_read(DAT_SECTION); + offset = FIELD_GET(DAT_TABLE_OFFSET, regval); + hci->DAT_regs = offset ? hci->base_regs + offset : NULL; + hci->DAT_entries = FIELD_GET(DAT_TABLE_SIZE, regval); + hci->DAT_entry_size = FIELD_GET(DAT_ENTRY_SIZE, regval); + dev_info(&hci->master.dev, "DAT: %u %u-bytes entries at offset %#x\n", + hci->DAT_entries, hci->DAT_entry_size * 4, offset); + + regval = reg_read(DCT_SECTION); + offset = FIELD_GET(DCT_TABLE_OFFSET, regval); + hci->DCT_regs = offset ? hci->base_regs + offset : NULL; + hci->DCT_entries = FIELD_GET(DCT_TABLE_SIZE, regval); + hci->DCT_entry_size = FIELD_GET(DCT_ENTRY_SIZE, regval); + dev_info(&hci->master.dev, "DCT: %u %u-bytes entries at offset %#x\n", + hci->DCT_entries, hci->DCT_entry_size * 4, offset); + + regval = reg_read(RING_HEADERS_SECTION); + offset = FIELD_GET(RING_HEADERS_OFFSET, regval); + hci->RHS_regs = offset ? hci->base_regs + offset : NULL; + dev_info(&hci->master.dev, "Ring Headers at offset %#x\n", offset); + + regval = reg_read(PIO_SECTION); + offset = FIELD_GET(PIO_REGS_OFFSET, regval); + hci->PIO_regs = offset ? hci->base_regs + offset : NULL; + dev_info(&hci->master.dev, "PIO section at offset %#x\n", offset); + + regval = reg_read(EXT_CAPS_SECTION); + offset = FIELD_GET(EXT_CAPS_OFFSET, regval); + hci->EXTCAPS_regs = offset ? hci->base_regs + offset : NULL; + dev_info(&hci->master.dev, "Extended Caps at offset %#x\n", offset); + + ret = i3c_hci_parse_ext_caps(hci); + if (ret) + return ret; + + /* + * Now let's reset the hardware. + * SOFT_RST must be clear before we write to it. + * Then we must wait until it clears again. + */ + ret = readx_poll_timeout(reg_read, RESET_CONTROL, regval, + !(regval & SOFT_RST), 1, 10000); + if (ret) + return -ENXIO; + reg_write(RESET_CONTROL, SOFT_RST); + ret = readx_poll_timeout(reg_read, RESET_CONTROL, regval, + !(regval & SOFT_RST), 1, 10000); + if (ret) + return -ENXIO; + + /* Disable all interrupts and allow all signal updates */ + reg_write(INTR_SIGNAL_ENABLE, 0x0); + reg_write(INTR_STATUS_ENABLE, 0xffffffff); + + /* Make sure our data ordering fits the host's */ + regval = reg_read(HC_CONTROL); + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) { + if (!(regval & HC_CONTROL_DATA_BIG_ENDIAN)) { + regval |= HC_CONTROL_DATA_BIG_ENDIAN; + reg_write(HC_CONTROL, regval); + regval = reg_read(HC_CONTROL); + if (!(regval & HC_CONTROL_DATA_BIG_ENDIAN)) { + dev_err(&hci->master.dev, "cannot set BE mode\n"); + return -EOPNOTSUPP; + } + } + } else { + if (regval & HC_CONTROL_DATA_BIG_ENDIAN) { + regval &= ~HC_CONTROL_DATA_BIG_ENDIAN; + reg_write(HC_CONTROL, regval); + regval = reg_read(HC_CONTROL); + if (regval & HC_CONTROL_DATA_BIG_ENDIAN) { + dev_err(&hci->master.dev, "cannot clear BE mode\n"); + return -EOPNOTSUPP; + } + } + } + + /* Select our command descriptor model */ + switch (FIELD_GET(HC_CAP_CMD_SIZE, hci->caps)) { + case 0: + hci->cmd = &mipi_i3c_hci_cmd_v1; + break; + case 1: + hci->cmd = &mipi_i3c_hci_cmd_v2; + break; + default: + dev_err(&hci->master.dev, "wrong CMD_SIZE capability value\n"); + return -EINVAL; + } + + /* Try activating DMA operations first */ + if (hci->RHS_regs) { + reg_clear(HC_CONTROL, HC_CONTROL_PIO_MODE); + if (reg_read(HC_CONTROL) & HC_CONTROL_PIO_MODE) { + dev_err(&hci->master.dev, "PIO mode is stuck\n"); + ret = -EIO; + } else { + hci->io = &mipi_i3c_hci_dma; + dev_info(&hci->master.dev, "Using DMA\n"); + } + } + + /* If no DMA, try PIO */ + if (!hci->io && hci->PIO_regs) { + reg_set(HC_CONTROL, HC_CONTROL_PIO_MODE); + if (!(reg_read(HC_CONTROL) & HC_CONTROL_PIO_MODE)) { + dev_err(&hci->master.dev, "DMA mode is stuck\n"); + ret = -EIO; + } else { + hci->io = &mipi_i3c_hci_pio; + dev_info(&hci->master.dev, "Using PIO\n"); + } + } + + if (!hci->io) { + dev_err(&hci->master.dev, "neither DMA nor PIO can be used\n"); + if (!ret) + ret = -EINVAL; + return ret; + } + + return 0; +} + +static int i3c_hci_probe(struct platform_device *pdev) +{ + struct i3c_hci *hci; + int irq, ret; + + hci = devm_kzalloc(&pdev->dev, sizeof(*hci), GFP_KERNEL); + if (!hci) + return -ENOMEM; + hci->base_regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(hci->base_regs)) + return PTR_ERR(hci->base_regs); + + platform_set_drvdata(pdev, hci); + /* temporary for dev_printk's, to be replaced in i3c_master_register */ + hci->master.dev.init_name = dev_name(&pdev->dev); + + ret = i3c_hci_init(hci); + if (ret) + return ret; + + irq = platform_get_irq(pdev, 0); + ret = devm_request_irq(&pdev->dev, irq, i3c_hci_irq_handler, + 0, NULL, hci); + if (ret) + return ret; + + ret = i3c_master_register(&hci->master, &pdev->dev, + &i3c_hci_ops, false); + if (ret) + return ret; + + return 0; +} + +static int i3c_hci_remove(struct platform_device *pdev) +{ + struct i3c_hci *hci = platform_get_drvdata(pdev); + + return i3c_master_unregister(&hci->master); +} + +static const __maybe_unused struct of_device_id i3c_hci_of_match[] = { + { .compatible = "mipi-i3c-hci", }, + {}, +}; +MODULE_DEVICE_TABLE(of, i3c_hci_of_match); + +static struct platform_driver i3c_hci_driver = { + .probe = i3c_hci_probe, + .remove = i3c_hci_remove, + .driver = { + .name = "mipi-i3c-hci", + .of_match_table = of_match_ptr(i3c_hci_of_match), + }, +}; +module_platform_driver(i3c_hci_driver); + +MODULE_AUTHOR("Nicolas Pitre <npitre@baylibre.com>"); +MODULE_DESCRIPTION("MIPI I3C HCI driver"); +MODULE_LICENSE("Dual BSD/GPL"); |