diff options
Diffstat (limited to 'drivers/i3c/master/mipi-i3c-hci/hci.h')
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/hci.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h new file mode 100644 index 000000000..f109923f6 --- /dev/null +++ b/drivers/i3c/master/mipi-i3c-hci/hci.h @@ -0,0 +1,144 @@ +/* SPDX-License-Identifier: BSD-3-Clause */ +/* + * Copyright (c) 2020, MIPI Alliance, Inc. + * + * Author: Nicolas Pitre <npitre@baylibre.com> + * + * Common HCI stuff + */ + +#ifndef HCI_H +#define HCI_H + + +/* Handy logging macro to save on line length */ +#define DBG(x, ...) pr_devel("%s: " x "\n", __func__, ##__VA_ARGS__) + +/* 32-bit word aware bit and mask macros */ +#define W0_MASK(h, l) GENMASK((h) - 0, (l) - 0) +#define W1_MASK(h, l) GENMASK((h) - 32, (l) - 32) +#define W2_MASK(h, l) GENMASK((h) - 64, (l) - 64) +#define W3_MASK(h, l) GENMASK((h) - 96, (l) - 96) + +/* Same for single bit macros (trailing _ to align with W*_MASK width) */ +#define W0_BIT_(x) BIT((x) - 0) +#define W1_BIT_(x) BIT((x) - 32) +#define W2_BIT_(x) BIT((x) - 64) +#define W3_BIT_(x) BIT((x) - 96) + + +struct hci_cmd_ops; + +/* Our main structure */ +struct i3c_hci { + struct i3c_master_controller master; + void __iomem *base_regs; + void __iomem *DAT_regs; + void __iomem *DCT_regs; + void __iomem *RHS_regs; + void __iomem *PIO_regs; + void __iomem *EXTCAPS_regs; + void __iomem *AUTOCMD_regs; + void __iomem *DEBUG_regs; + const struct hci_io_ops *io; + void *io_data; + const struct hci_cmd_ops *cmd; + atomic_t next_cmd_tid; + u32 caps; + unsigned int quirks; + unsigned int DAT_entries; + unsigned int DAT_entry_size; + void *DAT_data; + unsigned int DCT_entries; + unsigned int DCT_entry_size; + u8 version_major; + u8 version_minor; + u8 revision; + u32 vendor_mipi_id; + u32 vendor_version_id; + u32 vendor_product_id; + void *vendor_data; +}; + + +/* + * Structure to represent a master initiated transfer. + * The rnw, data and data_len fields must be initialized before calling any + * hci->cmd->*() method. The cmd method will initialize cmd_desc[] and + * possibly modify (clear) the data field. Then xfer->cmd_desc[0] can + * be augmented with CMD_0_ROC and/or CMD_0_TOC. + * The completion field needs to be initialized before queueing with + * hci->io->queue_xfer(), and requires CMD_0_ROC to be set. + */ +struct hci_xfer { + u32 cmd_desc[4]; + u32 response; + bool rnw; + void *data; + unsigned int data_len; + unsigned int cmd_tid; + struct completion *completion; + union { + struct { + /* PIO specific */ + struct hci_xfer *next_xfer; + struct hci_xfer *next_data; + struct hci_xfer *next_resp; + unsigned int data_left; + u32 data_word_before_partial; + }; + struct { + /* DMA specific */ + dma_addr_t data_dma; + int ring_number; + int ring_entry; + }; + }; +}; + +static inline struct hci_xfer *hci_alloc_xfer(unsigned int n) +{ + return kcalloc(n, sizeof(struct hci_xfer), GFP_KERNEL); +} + +static inline void hci_free_xfer(struct hci_xfer *xfer, unsigned int n) +{ + kfree(xfer); +} + + +/* This abstracts PIO vs DMA operations */ +struct hci_io_ops { + bool (*irq_handler)(struct i3c_hci *hci, unsigned int mask); + int (*queue_xfer)(struct i3c_hci *hci, struct hci_xfer *xfer, int n); + bool (*dequeue_xfer)(struct i3c_hci *hci, struct hci_xfer *xfer, int n); + int (*request_ibi)(struct i3c_hci *hci, struct i3c_dev_desc *dev, + const struct i3c_ibi_setup *req); + void (*free_ibi)(struct i3c_hci *hci, struct i3c_dev_desc *dev); + void (*recycle_ibi_slot)(struct i3c_hci *hci, struct i3c_dev_desc *dev, + struct i3c_ibi_slot *slot); + int (*init)(struct i3c_hci *hci); + void (*cleanup)(struct i3c_hci *hci); +}; + +extern const struct hci_io_ops mipi_i3c_hci_pio; +extern const struct hci_io_ops mipi_i3c_hci_dma; + + +/* Our per device master private data */ +struct i3c_hci_dev_data { + int dat_idx; + void *ibi_data; +}; + + +/* list of quirks */ +#define HCI_QUIRK_RAW_CCC BIT(1) /* CCC framing must be explicit */ + + +/* global functions */ +void mipi_i3c_hci_resume(struct i3c_hci *hci); +void mipi_i3c_hci_pio_reset(struct i3c_hci *hci); +void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci); + +#endif |