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