183 lines
4.5 KiB
C
183 lines
4.5 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Copyright (c) 2020, MIPI Alliance, Inc.
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*
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* Author: Nicolas Pitre <npitre@baylibre.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/bitmap.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/i3c/master.h>
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#include <linux/io.h>
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#include "hci.h"
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#include "dat.h"
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/*
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* Device Address Table Structure
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*/
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#define DAT_1_AUTOCMD_HDR_CODE W1_MASK(58, 51)
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#define DAT_1_AUTOCMD_MODE W1_MASK(50, 48)
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#define DAT_1_AUTOCMD_VALUE W1_MASK(47, 40)
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#define DAT_1_AUTOCMD_MASK W1_MASK(39, 32)
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/* DAT_0_I2C_DEVICE W0_BIT_(31) */
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#define DAT_0_DEV_NACK_RETRY_CNT W0_MASK(30, 29)
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#define DAT_0_RING_ID W0_MASK(28, 26)
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#define DAT_0_DYNADDR_PARITY W0_BIT_(23)
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#define DAT_0_DYNAMIC_ADDRESS W0_MASK(22, 16)
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#define DAT_0_TS W0_BIT_(15)
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#define DAT_0_MR_REJECT W0_BIT_(14)
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/* DAT_0_SIR_REJECT W0_BIT_(13) */
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/* DAT_0_IBI_PAYLOAD W0_BIT_(12) */
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#define DAT_0_STATIC_ADDRESS W0_MASK(6, 0)
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#define dat_w0_read(i) readl(hci->DAT_regs + (i) * 8)
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#define dat_w1_read(i) readl(hci->DAT_regs + (i) * 8 + 4)
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#define dat_w0_write(i, v) writel(v, hci->DAT_regs + (i) * 8)
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#define dat_w1_write(i, v) writel(v, hci->DAT_regs + (i) * 8 + 4)
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static inline bool dynaddr_parity(unsigned int addr)
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{
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addr |= 1 << 7;
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addr += addr >> 4;
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addr += addr >> 2;
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addr += addr >> 1;
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return (addr & 1);
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}
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static int hci_dat_v1_init(struct i3c_hci *hci)
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{
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unsigned int dat_idx;
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if (!hci->DAT_regs) {
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dev_err(&hci->master.dev,
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"only DAT in register space is supported at the moment\n");
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return -EOPNOTSUPP;
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}
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if (hci->DAT_entry_size != 8) {
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dev_err(&hci->master.dev,
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"only 8-bytes DAT entries are supported at the moment\n");
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return -EOPNOTSUPP;
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}
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/* use a bitmap for faster free slot search */
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hci->DAT_data = bitmap_zalloc(hci->DAT_entries, GFP_KERNEL);
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if (!hci->DAT_data)
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return -ENOMEM;
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/* clear them */
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for (dat_idx = 0; dat_idx < hci->DAT_entries; dat_idx++) {
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dat_w0_write(dat_idx, 0);
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dat_w1_write(dat_idx, 0);
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}
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return 0;
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}
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static void hci_dat_v1_cleanup(struct i3c_hci *hci)
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{
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bitmap_free(hci->DAT_data);
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hci->DAT_data = NULL;
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}
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static int hci_dat_v1_alloc_entry(struct i3c_hci *hci)
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{
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unsigned int dat_idx;
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dat_idx = find_first_zero_bit(hci->DAT_data, hci->DAT_entries);
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if (dat_idx >= hci->DAT_entries)
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return -ENOENT;
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__set_bit(dat_idx, hci->DAT_data);
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/* default flags */
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dat_w0_write(dat_idx, DAT_0_SIR_REJECT | DAT_0_MR_REJECT);
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return dat_idx;
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}
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static void hci_dat_v1_free_entry(struct i3c_hci *hci, unsigned int dat_idx)
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{
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dat_w0_write(dat_idx, 0);
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dat_w1_write(dat_idx, 0);
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__clear_bit(dat_idx, hci->DAT_data);
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}
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static void hci_dat_v1_set_dynamic_addr(struct i3c_hci *hci,
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unsigned int dat_idx, u8 address)
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{
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u32 dat_w0;
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dat_w0 = dat_w0_read(dat_idx);
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dat_w0 &= ~(DAT_0_DYNAMIC_ADDRESS | DAT_0_DYNADDR_PARITY);
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dat_w0 |= FIELD_PREP(DAT_0_DYNAMIC_ADDRESS, address) |
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(dynaddr_parity(address) ? DAT_0_DYNADDR_PARITY : 0);
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dat_w0_write(dat_idx, dat_w0);
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}
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static void hci_dat_v1_set_static_addr(struct i3c_hci *hci,
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unsigned int dat_idx, u8 address)
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{
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u32 dat_w0;
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dat_w0 = dat_w0_read(dat_idx);
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dat_w0 &= ~DAT_0_STATIC_ADDRESS;
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dat_w0 |= FIELD_PREP(DAT_0_STATIC_ADDRESS, address);
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dat_w0_write(dat_idx, dat_w0);
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}
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static void hci_dat_v1_set_flags(struct i3c_hci *hci, unsigned int dat_idx,
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u32 w0_flags, u32 w1_flags)
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{
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u32 dat_w0, dat_w1;
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dat_w0 = dat_w0_read(dat_idx);
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dat_w1 = dat_w1_read(dat_idx);
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dat_w0 |= w0_flags;
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dat_w1 |= w1_flags;
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dat_w0_write(dat_idx, dat_w0);
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dat_w1_write(dat_idx, dat_w1);
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}
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static void hci_dat_v1_clear_flags(struct i3c_hci *hci, unsigned int dat_idx,
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u32 w0_flags, u32 w1_flags)
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{
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u32 dat_w0, dat_w1;
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dat_w0 = dat_w0_read(dat_idx);
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dat_w1 = dat_w1_read(dat_idx);
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dat_w0 &= ~w0_flags;
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dat_w1 &= ~w1_flags;
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dat_w0_write(dat_idx, dat_w0);
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dat_w1_write(dat_idx, dat_w1);
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}
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static int hci_dat_v1_get_index(struct i3c_hci *hci, u8 dev_addr)
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{
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unsigned int dat_idx;
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u32 dat_w0;
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for_each_set_bit(dat_idx, hci->DAT_data, hci->DAT_entries) {
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dat_w0 = dat_w0_read(dat_idx);
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if (FIELD_GET(DAT_0_DYNAMIC_ADDRESS, dat_w0) == dev_addr)
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return dat_idx;
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}
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return -ENODEV;
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}
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const struct hci_dat_ops mipi_i3c_hci_dat_v1 = {
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.init = hci_dat_v1_init,
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.cleanup = hci_dat_v1_cleanup,
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.alloc_entry = hci_dat_v1_alloc_entry,
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.free_entry = hci_dat_v1_free_entry,
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.set_dynamic_addr = hci_dat_v1_set_dynamic_addr,
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.set_static_addr = hci_dat_v1_set_static_addr,
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.set_flags = hci_dat_v1_set_flags,
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.clear_flags = hci_dat_v1_clear_flags,
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.get_index = hci_dat_v1_get_index,
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};
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