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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/device.h>
#include <linux/errno.h>
#include <linux/i3c/master.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include "hci.h"
#include "ext_caps.h"
#include "xfer_mode_rate.h"
/* Extended Capability Header */
#define CAP_HEADER_LENGTH GENMASK(23, 8)
#define CAP_HEADER_ID GENMASK(7, 0)
static int hci_extcap_hardware_id(struct i3c_hci *hci, void __iomem *base)
{
hci->vendor_mipi_id = readl(base + 0x04);
hci->vendor_version_id = readl(base + 0x08);
hci->vendor_product_id = readl(base + 0x0c);
dev_info(&hci->master.dev, "vendor MIPI ID: %#x\n", hci->vendor_mipi_id);
dev_info(&hci->master.dev, "vendor version ID: %#x\n", hci->vendor_version_id);
dev_info(&hci->master.dev, "vendor product ID: %#x\n", hci->vendor_product_id);
/* ought to go in a table if this grows too much */
switch (hci->vendor_mipi_id) {
case MIPI_VENDOR_NXP:
hci->quirks |= HCI_QUIRK_RAW_CCC;
DBG("raw CCC quirks set");
break;
}
return 0;
}
static int hci_extcap_master_config(struct i3c_hci *hci, void __iomem *base)
{
u32 master_config = readl(base + 0x04);
unsigned int operation_mode = FIELD_GET(GENMASK(5, 4), master_config);
static const char * const functionality[] = {
"(unknown)", "master only", "target only",
"primary/secondary master" };
dev_info(&hci->master.dev, "operation mode: %s\n", functionality[operation_mode]);
if (operation_mode & 0x1)
return 0;
dev_err(&hci->master.dev, "only master mode is currently supported\n");
return -EOPNOTSUPP;
}
static int hci_extcap_multi_bus(struct i3c_hci *hci, void __iomem *base)
{
u32 bus_instance = readl(base + 0x04);
unsigned int count = FIELD_GET(GENMASK(3, 0), bus_instance);
dev_info(&hci->master.dev, "%d bus instances\n", count);
return 0;
}
static int hci_extcap_xfer_modes(struct i3c_hci *hci, void __iomem *base)
{
u32 header = readl(base);
u32 entries = FIELD_GET(CAP_HEADER_LENGTH, header) - 1;
unsigned int index;
dev_info(&hci->master.dev, "transfer mode table has %d entries\n",
entries);
base += 4; /* skip header */
for (index = 0; index < entries; index++) {
u32 mode_entry = readl(base);
DBG("mode %d: 0x%08x", index, mode_entry);
/* TODO: will be needed when I3C core does more than SDR */
base += 4;
}
return 0;
}
static int hci_extcap_xfer_rates(struct i3c_hci *hci, void __iomem *base)
{
u32 header = readl(base);
u32 entries = FIELD_GET(CAP_HEADER_LENGTH, header) - 1;
u32 rate_entry;
unsigned int index, rate, rate_id, mode_id;
base += 4; /* skip header */
dev_info(&hci->master.dev, "available data rates:\n");
for (index = 0; index < entries; index++) {
rate_entry = readl(base);
DBG("entry %d: 0x%08x", index, rate_entry);
rate = FIELD_GET(XFERRATE_ACTUAL_RATE_KHZ, rate_entry);
rate_id = FIELD_GET(XFERRATE_RATE_ID, rate_entry);
mode_id = FIELD_GET(XFERRATE_MODE_ID, rate_entry);
dev_info(&hci->master.dev, "rate %d for %s = %d kHz\n",
rate_id,
mode_id == XFERRATE_MODE_I3C ? "I3C" :
mode_id == XFERRATE_MODE_I2C ? "I2C" :
"unknown mode",
rate);
base += 4;
}
return 0;
}
static int hci_extcap_auto_command(struct i3c_hci *hci, void __iomem *base)
{
u32 autocmd_ext_caps = readl(base + 0x04);
unsigned int max_count = FIELD_GET(GENMASK(3, 0), autocmd_ext_caps);
u32 autocmd_ext_config = readl(base + 0x08);
unsigned int count = FIELD_GET(GENMASK(3, 0), autocmd_ext_config);
dev_info(&hci->master.dev, "%d/%d active auto-command entries\n",
count, max_count);
/* remember auto-command register location for later use */
hci->AUTOCMD_regs = base;
return 0;
}
static int hci_extcap_debug(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "debug registers present\n");
hci->DEBUG_regs = base;
return 0;
}
static int hci_extcap_scheduled_cmd(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "scheduled commands available\n");
/* hci->schedcmd_regs = base; */
return 0;
}
static int hci_extcap_non_curr_master(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Non-Current Master support available\n");
/* hci->NCM_regs = base; */
return 0;
}
static int hci_extcap_ccc_resp_conf(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "CCC Response Configuration available\n");
return 0;
}
static int hci_extcap_global_DAT(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Global DAT available\n");
return 0;
}
static int hci_extcap_multilane(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Master Multi-Lane support available\n");
return 0;
}
static int hci_extcap_ncm_multilane(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "NCM Multi-Lane support available\n");
return 0;
}
struct hci_ext_caps {
u8 id;
u16 min_length;
int (*parser)(struct i3c_hci *hci, void __iomem *base);
};
#define EXT_CAP(_id, _highest_mandatory_reg_offset, _parser) \
{ .id = (_id), .parser = (_parser), \
.min_length = (_highest_mandatory_reg_offset)/4 + 1 }
static const struct hci_ext_caps ext_capabilities[] = {
EXT_CAP(0x01, 0x0c, hci_extcap_hardware_id),
EXT_CAP(0x02, 0x04, hci_extcap_master_config),
EXT_CAP(0x03, 0x04, hci_extcap_multi_bus),
EXT_CAP(0x04, 0x24, hci_extcap_xfer_modes),
EXT_CAP(0x05, 0x08, hci_extcap_auto_command),
EXT_CAP(0x08, 0x40, hci_extcap_xfer_rates),
EXT_CAP(0x0c, 0x10, hci_extcap_debug),
EXT_CAP(0x0d, 0x0c, hci_extcap_scheduled_cmd),
EXT_CAP(0x0e, 0x80, hci_extcap_non_curr_master), /* TODO confirm size */
EXT_CAP(0x0f, 0x04, hci_extcap_ccc_resp_conf),
EXT_CAP(0x10, 0x08, hci_extcap_global_DAT),
EXT_CAP(0x9d, 0x04, hci_extcap_multilane),
EXT_CAP(0x9e, 0x04, hci_extcap_ncm_multilane),
};
static int hci_extcap_vendor_NXP(struct i3c_hci *hci, void __iomem *base)
{
hci->vendor_data = (__force void *)base;
dev_info(&hci->master.dev, "Build Date Info = %#x\n", readl(base + 1*4));
/* reset the FPGA */
writel(0xdeadbeef, base + 1*4);
return 0;
}
struct hci_ext_cap_vendor_specific {
u32 vendor;
u8 cap;
u16 min_length;
int (*parser)(struct i3c_hci *hci, void __iomem *base);
};
#define EXT_CAP_VENDOR(_vendor, _cap, _highest_mandatory_reg_offset) \
{ .vendor = (MIPI_VENDOR_##_vendor), .cap = (_cap), \
.parser = (hci_extcap_vendor_##_vendor), \
.min_length = (_highest_mandatory_reg_offset)/4 + 1 }
static const struct hci_ext_cap_vendor_specific vendor_ext_caps[] = {
EXT_CAP_VENDOR(NXP, 0xc0, 0x20),
};
static int hci_extcap_vendor_specific(struct i3c_hci *hci, void __iomem *base,
u32 cap_id, u32 cap_length)
{
const struct hci_ext_cap_vendor_specific *vendor_cap_entry;
int i;
vendor_cap_entry = NULL;
for (i = 0; i < ARRAY_SIZE(vendor_ext_caps); i++) {
if (vendor_ext_caps[i].vendor == hci->vendor_mipi_id &&
vendor_ext_caps[i].cap == cap_id) {
vendor_cap_entry = &vendor_ext_caps[i];
break;
}
}
if (!vendor_cap_entry) {
dev_notice(&hci->master.dev,
"unknown ext_cap 0x%02x for vendor 0x%02x\n",
cap_id, hci->vendor_mipi_id);
return 0;
}
if (cap_length < vendor_cap_entry->min_length) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (expecting >= %d)\n",
cap_id, cap_length, vendor_cap_entry->min_length);
return -EINVAL;
}
return vendor_cap_entry->parser(hci, base);
}
int i3c_hci_parse_ext_caps(struct i3c_hci *hci)
{
void __iomem *curr_cap = hci->EXTCAPS_regs;
void __iomem *end = curr_cap + 0x1000; /* some arbitrary limit */
u32 cap_header, cap_id, cap_length;
const struct hci_ext_caps *cap_entry;
int i, err = 0;
if (!curr_cap)
return 0;
for (; !err && curr_cap < end; curr_cap += cap_length * 4) {
cap_header = readl(curr_cap);
cap_id = FIELD_GET(CAP_HEADER_ID, cap_header);
cap_length = FIELD_GET(CAP_HEADER_LENGTH, cap_header);
DBG("id=0x%02x length=%d", cap_id, cap_length);
if (!cap_length)
break;
if (curr_cap + cap_length * 4 >= end) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (too big)\n",
cap_id, cap_length);
err = -EINVAL;
break;
}
if (cap_id >= 0xc0 && cap_id <= 0xcf) {
err = hci_extcap_vendor_specific(hci, curr_cap,
cap_id, cap_length);
continue;
}
cap_entry = NULL;
for (i = 0; i < ARRAY_SIZE(ext_capabilities); i++) {
if (ext_capabilities[i].id == cap_id) {
cap_entry = &ext_capabilities[i];
break;
}
}
if (!cap_entry) {
dev_notice(&hci->master.dev,
"unknown ext_cap 0x%02x\n", cap_id);
} else if (cap_length < cap_entry->min_length) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (expecting >= %d)\n",
cap_id, cap_length, cap_entry->min_length);
err = -EINVAL;
} else {
err = cap_entry->parser(hci, curr_cap);
}
}
return err;
}
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