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OpenCloudOS-Kernel/drivers/spmi/spmi-pmic-arb.c

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/*
* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitmap.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spmi.h>
/* PMIC Arbiter configuration registers */
#define PMIC_ARB_VERSION 0x0000
#define PMIC_ARB_VERSION_V2_MIN 0x20010000
#define PMIC_ARB_VERSION_V3_MIN 0x30000000
#define PMIC_ARB_INT_EN 0x0004
/* PMIC Arbiter channel registers offsets */
#define PMIC_ARB_CMD 0x00
#define PMIC_ARB_CONFIG 0x04
#define PMIC_ARB_STATUS 0x08
#define PMIC_ARB_WDATA0 0x10
#define PMIC_ARB_WDATA1 0x14
#define PMIC_ARB_RDATA0 0x18
#define PMIC_ARB_RDATA1 0x1C
#define PMIC_ARB_REG_CHNL(N) (0x800 + 0x4 * (N))
/* Mapping Table */
#define SPMI_MAPPING_TABLE_REG(N) (0x0B00 + (4 * (N)))
#define SPMI_MAPPING_BIT_INDEX(X) (((X) >> 18) & 0xF)
#define SPMI_MAPPING_BIT_IS_0_FLAG(X) (((X) >> 17) & 0x1)
#define SPMI_MAPPING_BIT_IS_0_RESULT(X) (((X) >> 9) & 0xFF)
#define SPMI_MAPPING_BIT_IS_1_FLAG(X) (((X) >> 8) & 0x1)
#define SPMI_MAPPING_BIT_IS_1_RESULT(X) (((X) >> 0) & 0xFF)
#define SPMI_MAPPING_TABLE_TREE_DEPTH 16 /* Maximum of 16-bits */
#define PMIC_ARB_MAX_PPID BIT(12) /* PPID is 12bit */
#define PMIC_ARB_CHAN_VALID BIT(15)
/* Ownership Table */
#define SPMI_OWNERSHIP_TABLE_REG(N) (0x0700 + (4 * (N)))
#define SPMI_OWNERSHIP_PERIPH2OWNER(X) ((X) & 0x7)
/* Channel Status fields */
enum pmic_arb_chnl_status {
PMIC_ARB_STATUS_DONE = BIT(0),
PMIC_ARB_STATUS_FAILURE = BIT(1),
PMIC_ARB_STATUS_DENIED = BIT(2),
PMIC_ARB_STATUS_DROPPED = BIT(3),
};
/* Command register fields */
#define PMIC_ARB_CMD_MAX_BYTE_COUNT 8
/* Command Opcodes */
enum pmic_arb_cmd_op_code {
PMIC_ARB_OP_EXT_WRITEL = 0,
PMIC_ARB_OP_EXT_READL = 1,
PMIC_ARB_OP_EXT_WRITE = 2,
PMIC_ARB_OP_RESET = 3,
PMIC_ARB_OP_SLEEP = 4,
PMIC_ARB_OP_SHUTDOWN = 5,
PMIC_ARB_OP_WAKEUP = 6,
PMIC_ARB_OP_AUTHENTICATE = 7,
PMIC_ARB_OP_MSTR_READ = 8,
PMIC_ARB_OP_MSTR_WRITE = 9,
PMIC_ARB_OP_EXT_READ = 13,
PMIC_ARB_OP_WRITE = 14,
PMIC_ARB_OP_READ = 15,
PMIC_ARB_OP_ZERO_WRITE = 16,
};
/* Maximum number of support PMIC peripherals */
#define PMIC_ARB_MAX_PERIPHS 512
#define PMIC_ARB_TIMEOUT_US 100
#define PMIC_ARB_MAX_TRANS_BYTES (8)
#define PMIC_ARB_APID_MASK 0xFF
#define PMIC_ARB_PPID_MASK 0xFFF
/* interrupt enable bit */
#define SPMI_PIC_ACC_ENABLE_BIT BIT(0)
#define HWIRQ(slave_id, periph_id, irq_id, apid) \
((((slave_id) & 0xF) << 28) | \
(((periph_id) & 0xFF) << 20) | \
(((irq_id) & 0x7) << 16) | \
(((apid) & 0x1FF) << 0))
#define HWIRQ_SID(hwirq) (((hwirq) >> 28) & 0xF)
#define HWIRQ_PER(hwirq) (((hwirq) >> 20) & 0xFF)
#define HWIRQ_IRQ(hwirq) (((hwirq) >> 16) & 0x7)
#define HWIRQ_APID(hwirq) (((hwirq) >> 0) & 0x1FF)
struct pmic_arb_ver_ops;
struct apid_data {
u16 ppid;
u8 owner;
};
/**
* spmi_pmic_arb - SPMI PMIC Arbiter object
*
* @rd_base: on v1 "core", on v2 "observer" register base off DT.
* @wr_base: on v1 "core", on v2 "chnls" register base off DT.
* @intr: address of the SPMI interrupt control registers.
* @cnfg: address of the PMIC Arbiter configuration registers.
* @lock: lock to synchronize accesses.
* @channel: execution environment channel to use for accesses.
* @irq: PMIC ARB interrupt.
* @ee: the current Execution Environment
* @min_apid: minimum APID (used for bounding IRQ search)
* @max_apid: maximum APID
* @max_periph: maximum number of PMIC peripherals supported by HW.
* @mapping_table: in-memory copy of PPID -> APID mapping table.
* @domain: irq domain object for PMIC IRQ domain
* @spmic: SPMI controller object
* @ver_ops: version dependent operations.
* @ppid_to_apid in-memory copy of PPID -> channel (APID) mapping table.
*/
struct spmi_pmic_arb {
void __iomem *rd_base;
void __iomem *wr_base;
void __iomem *intr;
void __iomem *cnfg;
void __iomem *core;
resource_size_t core_size;
raw_spinlock_t lock;
u8 channel;
int irq;
u8 ee;
u16 min_apid;
u16 max_apid;
u16 max_periph;
u32 *mapping_table;
DECLARE_BITMAP(mapping_table_valid, PMIC_ARB_MAX_PERIPHS);
struct irq_domain *domain;
struct spmi_controller *spmic;
const struct pmic_arb_ver_ops *ver_ops;
u16 *ppid_to_apid;
u16 last_apid;
struct apid_data apid_data[PMIC_ARB_MAX_PERIPHS];
};
/**
* pmic_arb_ver: version dependent functionality.
*
* @ver_str: version string.
* @ppid_to_apid: finds the apid for a given ppid.
* @mode: access rights to specified pmic peripheral.
* @non_data_cmd: on v1 issues an spmi non-data command.
* on v2 no HW support, returns -EOPNOTSUPP.
* @offset: on v1 offset of per-ee channel.
* on v2 offset of per-ee and per-ppid channel.
* @fmt_cmd: formats a GENI/SPMI command.
* @owner_acc_status: on v1 offset of PMIC_ARB_SPMI_PIC_OWNERm_ACC_STATUSn
* on v2 offset of SPMI_PIC_OWNERm_ACC_STATUSn.
* @acc_enable: on v1 offset of PMIC_ARB_SPMI_PIC_ACC_ENABLEn
* on v2 offset of SPMI_PIC_ACC_ENABLEn.
* @irq_status: on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_STATUSn
* on v2 offset of SPMI_PIC_IRQ_STATUSn.
* @irq_clear: on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_CLEARn
* on v2 offset of SPMI_PIC_IRQ_CLEARn.
*/
struct pmic_arb_ver_ops {
const char *ver_str;
int (*ppid_to_apid)(struct spmi_pmic_arb *pa, u8 sid, u16 addr,
u16 *apid);
int (*mode)(struct spmi_pmic_arb *dev, u8 sid, u16 addr,
mode_t *mode);
/* spmi commands (read_cmd, write_cmd, cmd) functionality */
int (*offset)(struct spmi_pmic_arb *dev, u8 sid, u16 addr,
u32 *offset);
u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc);
int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid);
/* Interrupts controller functionality (offset of PIC registers) */
u32 (*owner_acc_status)(u8 m, u16 n);
u32 (*acc_enable)(u16 n);
u32 (*irq_status)(u16 n);
u32 (*irq_clear)(u16 n);
};
static inline void pmic_arb_base_write(struct spmi_pmic_arb *pa,
u32 offset, u32 val)
{
writel_relaxed(val, pa->wr_base + offset);
}
static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb *pa,
u32 offset, u32 val)
{
writel_relaxed(val, pa->rd_base + offset);
}
/**
* pa_read_data: reads pmic-arb's register and copy 1..4 bytes to buf
* @bc: byte count -1. range: 0..3
* @reg: register's address
* @buf: output parameter, length must be bc + 1
*/
static void pa_read_data(struct spmi_pmic_arb *pa, u8 *buf, u32 reg, u8 bc)
{
u32 data = __raw_readl(pa->rd_base + reg);
memcpy(buf, &data, (bc & 3) + 1);
}
/**
* pa_write_data: write 1..4 bytes from buf to pmic-arb's register
* @bc: byte-count -1. range: 0..3.
* @reg: register's address.
* @buf: buffer to write. length must be bc + 1.
*/
static void
pa_write_data(struct spmi_pmic_arb *pa, const u8 *buf, u32 reg, u8 bc)
{
u32 data = 0;
memcpy(&data, buf, (bc & 3) + 1);
pmic_arb_base_write(pa, reg, data);
}
static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
void __iomem *base, u8 sid, u16 addr)
{
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
u32 status = 0;
u32 timeout = PMIC_ARB_TIMEOUT_US;
u32 offset;
int rc;
rc = pa->ver_ops->offset(pa, sid, addr, &offset);
if (rc)
return rc;
offset += PMIC_ARB_STATUS;
while (timeout--) {
status = readl_relaxed(base + offset);
if (status & PMIC_ARB_STATUS_DONE) {
if (status & PMIC_ARB_STATUS_DENIED) {
dev_err(&ctrl->dev,
"%s: transaction denied (0x%x)\n",
__func__, status);
return -EPERM;
}
if (status & PMIC_ARB_STATUS_FAILURE) {
dev_err(&ctrl->dev,
"%s: transaction failed (0x%x)\n",
__func__, status);
return -EIO;
}
if (status & PMIC_ARB_STATUS_DROPPED) {
dev_err(&ctrl->dev,
"%s: transaction dropped (0x%x)\n",
__func__, status);
return -EIO;
}
return 0;
}
udelay(1);
}
dev_err(&ctrl->dev,
"%s: timeout, status 0x%x\n",
__func__, status);
return -ETIMEDOUT;
}
static int
pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid)
{
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
unsigned long flags;
u32 cmd;
int rc;
u32 offset;
rc = pa->ver_ops->offset(pa, sid, 0, &offset);
if (rc)
return rc;
cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);
raw_spin_lock_irqsave(&pa->lock, flags);
pmic_arb_base_write(pa, offset + PMIC_ARB_CMD, cmd);
rc = pmic_arb_wait_for_done(ctrl, pa->wr_base, sid, 0);
raw_spin_unlock_irqrestore(&pa->lock, flags);
return rc;
}
static int
pmic_arb_non_data_cmd_v2(struct spmi_controller *ctrl, u8 opc, u8 sid)
{
return -EOPNOTSUPP;
}
/* Non-data command */
static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
{
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
dev_dbg(&ctrl->dev, "cmd op:0x%x sid:%d\n", opc, sid);
/* Check for valid non-data command */
if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
return -EINVAL;
return pa->ver_ops->non_data_cmd(ctrl, opc, sid);
}
static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
u16 addr, u8 *buf, size_t len)
{
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
unsigned long flags;
u8 bc = len - 1;
u32 cmd;
int rc;
u32 offset;
mode_t mode;
rc = pa->ver_ops->offset(pa, sid, addr, &offset);
if (rc)
return rc;
rc = pa->ver_ops->mode(pa, sid, addr, &mode);
if (rc)
return rc;
if (!(mode & S_IRUSR)) {
dev_err(&pa->spmic->dev,
"error: impermissible read from peripheral sid:%d addr:0x%x\n",
sid, addr);
return -EPERM;
}
if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
dev_err(&ctrl->dev,
"pmic-arb supports 1..%d bytes per trans, but:%zu requested",
PMIC_ARB_MAX_TRANS_BYTES, len);
return -EINVAL;
}
/* Check the opcode */
if (opc >= 0x60 && opc <= 0x7F)
opc = PMIC_ARB_OP_READ;
else if (opc >= 0x20 && opc <= 0x2F)
opc = PMIC_ARB_OP_EXT_READ;
else if (opc >= 0x38 && opc <= 0x3F)
opc = PMIC_ARB_OP_EXT_READL;
else
return -EINVAL;
cmd = pa->ver_ops->fmt_cmd(opc, sid, addr, bc);
raw_spin_lock_irqsave(&pa->lock, flags);
pmic_arb_set_rd_cmd(pa, offset + PMIC_ARB_CMD, cmd);
rc = pmic_arb_wait_for_done(ctrl, pa->rd_base, sid, addr);
if (rc)
goto done;
pa_read_data(pa, buf, offset + PMIC_ARB_RDATA0,
min_t(u8, bc, 3));
if (bc > 3)
pa_read_data(pa, buf + 4, offset + PMIC_ARB_RDATA1, bc - 4);
done:
raw_spin_unlock_irqrestore(&pa->lock, flags);
return rc;
}
static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
u16 addr, const u8 *buf, size_t len)
{
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
unsigned long flags;
u8 bc = len - 1;
u32 cmd;
int rc;
u32 offset;
mode_t mode;
rc = pa->ver_ops->offset(pa, sid, addr, &offset);
if (rc)
return rc;
rc = pa->ver_ops->mode(pa, sid, addr, &mode);
if (rc)
return rc;
if (!(mode & S_IWUSR)) {
dev_err(&pa->spmic->dev,
"error: impermissible write to peripheral sid:%d addr:0x%x\n",
sid, addr);
return -EPERM;
}
if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
dev_err(&ctrl->dev,
"pmic-arb supports 1..%d bytes per trans, but:%zu requested",
PMIC_ARB_MAX_TRANS_BYTES, len);
return -EINVAL;
}
/* Check the opcode */
if (opc >= 0x40 && opc <= 0x5F)
opc = PMIC_ARB_OP_WRITE;
else if (opc >= 0x00 && opc <= 0x0F)
opc = PMIC_ARB_OP_EXT_WRITE;
else if (opc >= 0x30 && opc <= 0x37)
opc = PMIC_ARB_OP_EXT_WRITEL;
else if (opc >= 0x80)
opc = PMIC_ARB_OP_ZERO_WRITE;
else
return -EINVAL;
cmd = pa->ver_ops->fmt_cmd(opc, sid, addr, bc);
/* Write data to FIFOs */
raw_spin_lock_irqsave(&pa->lock, flags);
pa_write_data(pa, buf, offset + PMIC_ARB_WDATA0, min_t(u8, bc, 3));
if (bc > 3)
pa_write_data(pa, buf + 4, offset + PMIC_ARB_WDATA1, bc - 4);
/* Start the transaction */
pmic_arb_base_write(pa, offset + PMIC_ARB_CMD, cmd);
rc = pmic_arb_wait_for_done(ctrl, pa->wr_base, sid, addr);
raw_spin_unlock_irqrestore(&pa->lock, flags);
return rc;
}
enum qpnpint_regs {
QPNPINT_REG_RT_STS = 0x10,
QPNPINT_REG_SET_TYPE = 0x11,
QPNPINT_REG_POLARITY_HIGH = 0x12,
QPNPINT_REG_POLARITY_LOW = 0x13,
QPNPINT_REG_LATCHED_CLR = 0x14,
QPNPINT_REG_EN_SET = 0x15,
QPNPINT_REG_EN_CLR = 0x16,
QPNPINT_REG_LATCHED_STS = 0x18,
};
struct spmi_pmic_arb_qpnpint_type {
u8 type; /* 1 -> edge */
u8 polarity_high;
u8 polarity_low;
} __packed;
/* Simplified accessor functions for irqchip callbacks */
static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf,
size_t len)
{
struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
u8 sid = HWIRQ_SID(d->hwirq);
u8 per = HWIRQ_PER(d->hwirq);
if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
(per << 8) + reg, buf, len))
dev_err_ratelimited(&pa->spmic->dev,
"failed irqchip transaction on %x\n",
d->irq);
}
static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len)
{
struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
u8 sid = HWIRQ_SID(d->hwirq);
u8 per = HWIRQ_PER(d->hwirq);
if (pmic_arb_read_cmd(pa->spmic, SPMI_CMD_EXT_READL, sid,
(per << 8) + reg, buf, len))
dev_err_ratelimited(&pa->spmic->dev,
"failed irqchip transaction on %x\n",
d->irq);
}
static void cleanup_irq(struct spmi_pmic_arb *pa, u16 apid, int id)
{
u16 ppid = pa->apid_data[apid].ppid;
u8 sid = ppid >> 8;
u8 per = ppid & 0xFF;
u8 irq_mask = BIT(id);
writel_relaxed(irq_mask, pa->intr + pa->ver_ops->irq_clear(apid));
if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
(per << 8) + QPNPINT_REG_LATCHED_CLR, &irq_mask, 1))
dev_err_ratelimited(&pa->spmic->dev,
"failed to ack irq_mask = 0x%x for ppid = %x\n",
irq_mask, ppid);
if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
(per << 8) + QPNPINT_REG_EN_CLR, &irq_mask, 1))
dev_err_ratelimited(&pa->spmic->dev,
"failed to ack irq_mask = 0x%x for ppid = %x\n",
irq_mask, ppid);
}
static void periph_interrupt(struct spmi_pmic_arb *pa, u16 apid)
{
unsigned int irq;
u32 status;
int id;
u8 sid = (pa->apid_data[apid].ppid >> 8) & 0xF;
u8 per = pa->apid_data[apid].ppid & 0xFF;
status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid));
while (status) {
id = ffs(status) - 1;
status &= ~BIT(id);
irq = irq_find_mapping(pa->domain, HWIRQ(sid, per, id, apid));
if (irq == 0) {
cleanup_irq(pa, apid, id);
continue;
}
generic_handle_irq(irq);
}
}
static void pmic_arb_chained_irq(struct irq_desc *desc)
{
struct spmi_pmic_arb *pa = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
void __iomem *intr = pa->intr;
int first = pa->min_apid >> 5;
int last = pa->max_apid >> 5;
u32 status, enable;
int i, id, apid;
chained_irq_enter(chip, desc);
for (i = first; i <= last; ++i) {
status = readl_relaxed(intr +
pa->ver_ops->owner_acc_status(pa->ee, i));
while (status) {
id = ffs(status) - 1;
status &= ~BIT(id);
apid = id + i * 32;
enable = readl_relaxed(intr +
pa->ver_ops->acc_enable(apid));
if (enable & SPMI_PIC_ACC_ENABLE_BIT)
periph_interrupt(pa, apid);
}
}
chained_irq_exit(chip, desc);
}
static void qpnpint_irq_ack(struct irq_data *d)
{
struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
u8 irq = HWIRQ_IRQ(d->hwirq);
u16 apid = HWIRQ_APID(d->hwirq);
u8 data;
writel_relaxed(BIT(irq), pa->intr + pa->ver_ops->irq_clear(apid));
data = BIT(irq);
qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
}
static void qpnpint_irq_mask(struct irq_data *d)
{
u8 irq = HWIRQ_IRQ(d->hwirq);
u8 data = BIT(irq);
qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
}
static void qpnpint_irq_unmask(struct irq_data *d)
{
struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
u8 irq = HWIRQ_IRQ(d->hwirq);
u16 apid = HWIRQ_APID(d->hwirq);
u8 buf[2];
writel_relaxed(SPMI_PIC_ACC_ENABLE_BIT,
pa->intr + pa->ver_ops->acc_enable(apid));
qpnpint_spmi_read(d, QPNPINT_REG_EN_SET, &buf[0], 1);
if (!(buf[0] & BIT(irq))) {
/*
* Since the interrupt is currently disabled, write to both the
* LATCHED_CLR and EN_SET registers so that a spurious interrupt
* cannot be triggered when the interrupt is enabled
*/
buf[0] = BIT(irq);
buf[1] = BIT(irq);
qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &buf, 2);
}
}
static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct spmi_pmic_arb_qpnpint_type type;
u8 irq = HWIRQ_IRQ(d->hwirq);
u8 bit_mask_irq = BIT(irq);
qpnpint_spmi_read(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type));
if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
type.type |= bit_mask_irq;
if (flow_type & IRQF_TRIGGER_RISING)
type.polarity_high |= bit_mask_irq;
if (flow_type & IRQF_TRIGGER_FALLING)
type.polarity_low |= bit_mask_irq;
} else {
if ((flow_type & (IRQF_TRIGGER_HIGH)) &&
(flow_type & (IRQF_TRIGGER_LOW)))
return -EINVAL;
type.type &= ~bit_mask_irq; /* level trig */
if (flow_type & IRQF_TRIGGER_HIGH)
type.polarity_high |= bit_mask_irq;
else
type.polarity_low |= bit_mask_irq;
}
qpnpint_spmi_write(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type));
if (flow_type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(d, handle_edge_irq);
else
irq_set_handler_locked(d, handle_level_irq);
return 0;
}
static int qpnpint_get_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which,
bool *state)
{
u8 irq = HWIRQ_IRQ(d->hwirq);
u8 status = 0;
if (which != IRQCHIP_STATE_LINE_LEVEL)
return -EINVAL;
qpnpint_spmi_read(d, QPNPINT_REG_RT_STS, &status, 1);
*state = !!(status & BIT(irq));
return 0;
}
static struct irq_chip pmic_arb_irqchip = {
.name = "pmic_arb",
.irq_ack = qpnpint_irq_ack,
.irq_mask = qpnpint_irq_mask,
.irq_unmask = qpnpint_irq_unmask,
.irq_set_type = qpnpint_irq_set_type,
.irq_get_irqchip_state = qpnpint_get_irqchip_state,
.flags = IRQCHIP_MASK_ON_SUSPEND
| IRQCHIP_SKIP_SET_WAKE,
};
static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec,
unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
struct spmi_pmic_arb *pa = d->host_data;
int rc;
u16 apid;
dev_dbg(&pa->spmic->dev,
"intspec[0] 0x%1x intspec[1] 0x%02x intspec[2] 0x%02x\n",
intspec[0], intspec[1], intspec[2]);
if (irq_domain_get_of_node(d) != controller)
return -EINVAL;
if (intsize != 4)
return -EINVAL;
if (intspec[0] > 0xF || intspec[1] > 0xFF || intspec[2] > 0x7)
return -EINVAL;
rc = pa->ver_ops->ppid_to_apid(pa, intspec[0],
(intspec[1] << 8), &apid);
if (rc < 0) {
dev_err(&pa->spmic->dev,
"failed to xlate sid = 0x%x, periph = 0x%x, irq = %x rc = %d\n",
intspec[0], intspec[1], intspec[2], rc);
return rc;
}
/* Keep track of {max,min}_apid for bounding search during interrupt */
if (apid > pa->max_apid)
pa->max_apid = apid;
if (apid < pa->min_apid)
pa->min_apid = apid;
*out_hwirq = HWIRQ(intspec[0], intspec[1], intspec[2], apid);
*out_type = intspec[3] & IRQ_TYPE_SENSE_MASK;
dev_dbg(&pa->spmic->dev, "out_hwirq = %lu\n", *out_hwirq);
return 0;
}
static int qpnpint_irq_domain_map(struct irq_domain *d,
unsigned int virq,
irq_hw_number_t hwirq)
{
struct spmi_pmic_arb *pa = d->host_data;
dev_dbg(&pa->spmic->dev, "virq = %u, hwirq = %lu\n", virq, hwirq);
irq_set_chip_and_handler(virq, &pmic_arb_irqchip, handle_level_irq);
irq_set_chip_data(virq, d->host_data);
irq_set_noprobe(virq);
return 0;
}
static int
pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u16 *apid)
{
u16 ppid = sid << 8 | ((addr >> 8) & 0xFF);
u32 *mapping_table = pa->mapping_table;
int index = 0, i;
u16 apid_valid;
u32 data;
apid_valid = pa->ppid_to_apid[ppid];
if (apid_valid & PMIC_ARB_CHAN_VALID) {
*apid = (apid_valid & ~PMIC_ARB_CHAN_VALID);
return 0;
}
for (i = 0; i < SPMI_MAPPING_TABLE_TREE_DEPTH; ++i) {
if (!test_and_set_bit(index, pa->mapping_table_valid))
mapping_table[index] = readl_relaxed(pa->cnfg +
SPMI_MAPPING_TABLE_REG(index));
data = mapping_table[index];
if (ppid & BIT(SPMI_MAPPING_BIT_INDEX(data))) {
if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) {
index = SPMI_MAPPING_BIT_IS_1_RESULT(data);
} else {
*apid = SPMI_MAPPING_BIT_IS_1_RESULT(data);
pa->ppid_to_apid[ppid]
= *apid | PMIC_ARB_CHAN_VALID;
pa->apid_data[*apid].ppid = ppid;
return 0;
}
} else {
if (SPMI_MAPPING_BIT_IS_0_FLAG(data)) {
index = SPMI_MAPPING_BIT_IS_0_RESULT(data);
} else {
*apid = SPMI_MAPPING_BIT_IS_0_RESULT(data);
pa->ppid_to_apid[ppid]
= *apid | PMIC_ARB_CHAN_VALID;
pa->apid_data[*apid].ppid = ppid;
return 0;
}
}
}
return -ENODEV;
}
static int
pmic_arb_mode_v1_v3(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode)
{
*mode = S_IRUSR | S_IWUSR;
return 0;
}
/* v1 offset per ee */
static int
pmic_arb_offset_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset)
{
*offset = 0x800 + 0x80 * pa->channel;
return 0;
}
static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid)
{
u32 regval, offset;
u16 apid;
u16 id;
/*
* PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
* ppid_to_apid is an in-memory invert of that table.
*/
for (apid = pa->last_apid; apid < pa->max_periph; apid++) {
regval = readl_relaxed(pa->cnfg +
SPMI_OWNERSHIP_TABLE_REG(apid));
pa->apid_data[apid].owner = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
offset = PMIC_ARB_REG_CHNL(apid);
if (offset >= pa->core_size)
break;
regval = readl_relaxed(pa->core + offset);
if (!regval)
continue;
id = (regval >> 8) & PMIC_ARB_PPID_MASK;
pa->ppid_to_apid[id] = apid | PMIC_ARB_CHAN_VALID;
pa->apid_data[apid].ppid = id;
if (id == ppid) {
apid |= PMIC_ARB_CHAN_VALID;
break;
}
}
pa->last_apid = apid & ~PMIC_ARB_CHAN_VALID;
return apid;
}
static int
pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u16 *apid)
{
u16 ppid = (sid << 8) | (addr >> 8);
u16 apid_valid;
apid_valid = pa->ppid_to_apid[ppid];
if (!(apid_valid & PMIC_ARB_CHAN_VALID))
apid_valid = pmic_arb_find_apid(pa, ppid);
if (!(apid_valid & PMIC_ARB_CHAN_VALID))
return -ENODEV;
*apid = (apid_valid & ~PMIC_ARB_CHAN_VALID);
return 0;
}
static int
pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode)
{
u16 apid;
int rc;
rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid);
if (rc < 0)
return rc;
*mode = 0;
*mode |= S_IRUSR;
if (pa->ee == pa->apid_data[apid].owner)
*mode |= S_IWUSR;
return 0;
}
/* v2 offset per ppid and per ee */
static int
pmic_arb_offset_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset)
{
u16 apid;
int rc;
rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid);
if (rc < 0)
return rc;
*offset = 0x1000 * pa->ee + 0x8000 * apid;
return 0;
}
static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u16 addr, u8 bc)
{
return (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
}
static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
{
return (opc << 27) | ((addr & 0xff) << 4) | (bc & 0x7);
}
static u32 pmic_arb_owner_acc_status_v1(u8 m, u16 n)
{
return 0x20 * m + 0x4 * n;
}
static u32 pmic_arb_owner_acc_status_v2(u8 m, u16 n)
{
return 0x100000 + 0x1000 * m + 0x4 * n;
}
static u32 pmic_arb_owner_acc_status_v3(u8 m, u16 n)
{
return 0x200000 + 0x1000 * m + 0x4 * n;
}
static u32 pmic_arb_acc_enable_v1(u16 n)
{
return 0x200 + 0x4 * n;
}
static u32 pmic_arb_acc_enable_v2(u16 n)
{
return 0x1000 * n;
}
static u32 pmic_arb_irq_status_v1(u16 n)
{
return 0x600 + 0x4 * n;
}
static u32 pmic_arb_irq_status_v2(u16 n)
{
return 0x4 + 0x1000 * n;
}
static u32 pmic_arb_irq_clear_v1(u16 n)
{
return 0xA00 + 0x4 * n;
}
static u32 pmic_arb_irq_clear_v2(u16 n)
{
return 0x8 + 0x1000 * n;
}
static const struct pmic_arb_ver_ops pmic_arb_v1 = {
.ver_str = "v1",
.ppid_to_apid = pmic_arb_ppid_to_apid_v1,
.mode = pmic_arb_mode_v1_v3,
.non_data_cmd = pmic_arb_non_data_cmd_v1,
.offset = pmic_arb_offset_v1,
.fmt_cmd = pmic_arb_fmt_cmd_v1,
.owner_acc_status = pmic_arb_owner_acc_status_v1,
.acc_enable = pmic_arb_acc_enable_v1,
.irq_status = pmic_arb_irq_status_v1,
.irq_clear = pmic_arb_irq_clear_v1,
};
static const struct pmic_arb_ver_ops pmic_arb_v2 = {
.ver_str = "v2",
.ppid_to_apid = pmic_arb_ppid_to_apid_v2,
.mode = pmic_arb_mode_v2,
.non_data_cmd = pmic_arb_non_data_cmd_v2,
.offset = pmic_arb_offset_v2,
.fmt_cmd = pmic_arb_fmt_cmd_v2,
.owner_acc_status = pmic_arb_owner_acc_status_v2,
.acc_enable = pmic_arb_acc_enable_v2,
.irq_status = pmic_arb_irq_status_v2,
.irq_clear = pmic_arb_irq_clear_v2,
};
static const struct pmic_arb_ver_ops pmic_arb_v3 = {
.ver_str = "v3",
.ppid_to_apid = pmic_arb_ppid_to_apid_v2,
.mode = pmic_arb_mode_v1_v3,
.non_data_cmd = pmic_arb_non_data_cmd_v2,
.offset = pmic_arb_offset_v2,
.fmt_cmd = pmic_arb_fmt_cmd_v2,
.owner_acc_status = pmic_arb_owner_acc_status_v3,
.acc_enable = pmic_arb_acc_enable_v2,
.irq_status = pmic_arb_irq_status_v2,
.irq_clear = pmic_arb_irq_clear_v2,
};
static const struct irq_domain_ops pmic_arb_irq_domain_ops = {
.map = qpnpint_irq_domain_map,
.xlate = qpnpint_irq_domain_dt_translate,
};
static int spmi_pmic_arb_probe(struct platform_device *pdev)
{
struct spmi_pmic_arb *pa;
struct spmi_controller *ctrl;
struct resource *res;
void __iomem *core;
u32 channel, ee, hw_ver;
int err;
ctrl = spmi_controller_alloc(&pdev->dev, sizeof(*pa));
if (!ctrl)
return -ENOMEM;
pa = spmi_controller_get_drvdata(ctrl);
pa->spmic = ctrl;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
pa->core_size = resource_size(res);
if (pa->core_size <= 0x800) {
dev_err(&pdev->dev, "core_size is smaller than 0x800. Failing Probe\n");
err = -EINVAL;
goto err_put_ctrl;
}
core = devm_ioremap_resource(&ctrl->dev, res);
if (IS_ERR(core)) {
err = PTR_ERR(core);
goto err_put_ctrl;
}
pa->ppid_to_apid = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PPID,
sizeof(*pa->ppid_to_apid), GFP_KERNEL);
if (!pa->ppid_to_apid) {
err = -ENOMEM;
goto err_put_ctrl;
}
hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
if (hw_ver < PMIC_ARB_VERSION_V2_MIN) {
pa->ver_ops = &pmic_arb_v1;
pa->wr_base = core;
pa->rd_base = core;
} else {
pa->core = core;
if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
pa->ver_ops = &pmic_arb_v2;
else
pa->ver_ops = &pmic_arb_v3;
/* the apid to ppid table starts at PMIC_ARB_REG_CHNL(0) */
pa->max_periph = (pa->core_size - PMIC_ARB_REG_CHNL(0)) / 4;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"obsrvr");
pa->rd_base = devm_ioremap_resource(&ctrl->dev, res);
if (IS_ERR(pa->rd_base)) {
err = PTR_ERR(pa->rd_base);
goto err_put_ctrl;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"chnls");
pa->wr_base = devm_ioremap_resource(&ctrl->dev, res);
if (IS_ERR(pa->wr_base)) {
err = PTR_ERR(pa->wr_base);
goto err_put_ctrl;
}
}
dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n",
pa->ver_ops->ver_str, hw_ver);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr");
pa->intr = devm_ioremap_resource(&ctrl->dev, res);
if (IS_ERR(pa->intr)) {
err = PTR_ERR(pa->intr);
goto err_put_ctrl;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cnfg");
pa->cnfg = devm_ioremap_resource(&ctrl->dev, res);
if (IS_ERR(pa->cnfg)) {
err = PTR_ERR(pa->cnfg);
goto err_put_ctrl;
}
pa->irq = platform_get_irq_byname(pdev, "periph_irq");
if (pa->irq < 0) {
err = pa->irq;
goto err_put_ctrl;
}
err = of_property_read_u32(pdev->dev.of_node, "qcom,channel", &channel);
if (err) {
dev_err(&pdev->dev, "channel unspecified.\n");
goto err_put_ctrl;
}
if (channel > 5) {
dev_err(&pdev->dev, "invalid channel (%u) specified.\n",
channel);
err = -EINVAL;
goto err_put_ctrl;
}
pa->channel = channel;
err = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &ee);
if (err) {
dev_err(&pdev->dev, "EE unspecified.\n");
goto err_put_ctrl;
}
if (ee > 5) {
dev_err(&pdev->dev, "invalid EE (%u) specified\n", ee);
err = -EINVAL;
goto err_put_ctrl;
}
pa->ee = ee;
pa->mapping_table = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PERIPHS - 1,
sizeof(*pa->mapping_table), GFP_KERNEL);
if (!pa->mapping_table) {
err = -ENOMEM;
goto err_put_ctrl;
}
/* Initialize max_apid/min_apid to the opposite bounds, during
* the irq domain translation, we are sure to update these */
pa->max_apid = 0;
pa->min_apid = PMIC_ARB_MAX_PERIPHS - 1;
platform_set_drvdata(pdev, ctrl);
raw_spin_lock_init(&pa->lock);
ctrl->cmd = pmic_arb_cmd;
ctrl->read_cmd = pmic_arb_read_cmd;
ctrl->write_cmd = pmic_arb_write_cmd;
dev_dbg(&pdev->dev, "adding irq domain\n");
pa->domain = irq_domain_add_tree(pdev->dev.of_node,
&pmic_arb_irq_domain_ops, pa);
if (!pa->domain) {
dev_err(&pdev->dev, "unable to create irq_domain\n");
err = -ENOMEM;
goto err_put_ctrl;
}
irq_set_chained_handler_and_data(pa->irq, pmic_arb_chained_irq, pa);
enable_irq_wake(pa->irq);
err = spmi_controller_add(ctrl);
if (err)
goto err_domain_remove;
return 0;
err_domain_remove:
irq_set_chained_handler_and_data(pa->irq, NULL, NULL);
irq_domain_remove(pa->domain);
err_put_ctrl:
spmi_controller_put(ctrl);
return err;
}
static int spmi_pmic_arb_remove(struct platform_device *pdev)
{
struct spmi_controller *ctrl = platform_get_drvdata(pdev);
struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl);
spmi_controller_remove(ctrl);
irq_set_chained_handler_and_data(pa->irq, NULL, NULL);
irq_domain_remove(pa->domain);
spmi_controller_put(ctrl);
return 0;
}
static const struct of_device_id spmi_pmic_arb_match_table[] = {
{ .compatible = "qcom,spmi-pmic-arb", },
{},
};
MODULE_DEVICE_TABLE(of, spmi_pmic_arb_match_table);
static struct platform_driver spmi_pmic_arb_driver = {
.probe = spmi_pmic_arb_probe,
.remove = spmi_pmic_arb_remove,
.driver = {
.name = "spmi_pmic_arb",
.of_match_table = spmi_pmic_arb_match_table,
},
};
module_platform_driver(spmi_pmic_arb_driver);
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:spmi_pmic_arb");
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