[PATCH V3 3/4] spmi: pmic-arb: add support for HW version 5

Kiran Gunda
2017-07-11T01:45:39Z

From: David Collins <collinsd@codeaurora.org>

Add support for version 5 of the SPMI PMIC arbiter. It utilizes
different offsets for registers than those found on version 3.
Also, the procedure to determine if writing and IRQ access is
allowed for a given PPID changes for version 5.

Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
drivers/spmi/spmi-pmic-arb.c | 235 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 217 insertions(+), 18 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index c7b54a6..5297aa4 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2017, 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
@@ -29,6 +29,7 @@
#define PMIC_ARB_VERSION 0x0000
#define PMIC_ARB_VERSION_V2_MIN 0x20010000
#define PMIC_ARB_VERSION_V3_MIN 0x30000000
+#define PMIC_ARB_VERSION_V5_MIN 0x50000000
#define PMIC_ARB_INT_EN 0x0004

/* PMIC Arbiter channel registers offsets */
@@ -39,7 +40,6 @@
#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)))
@@ -52,6 +52,8 @@
#define SPMI_MAPPING_TABLE_TREE_DEPTH 16 /* Maximum of 16-bits */
#define PMIC_ARB_MAX_PPID BIT(12) /* PPID is 12bit */
#define PMIC_ARB_APID_VALID BIT(15)
+#define PMIC_ARB_CHAN_IS_IRQ_OWNER(reg) ((reg) & BIT(24))
+#define INVALID_EE 0xFF

/* Ownership Table */
#define SPMI_OWNERSHIP_TABLE_REG(N) (0x0700 + (4 * (N)))
@@ -86,6 +88,15 @@ enum pmic_arb_cmd_op_code {
PMIC_ARB_OP_ZERO_WRITE = 16,
};

+/*
+ * PMIC arbiter version 5 uses different register offsets for read/write vs
+ * observer channels.
+ */
+enum pmic_arb_channel {
+ PMIC_ARB_CHANNEL_RW,
+ PMIC_ARB_CHANNEL_OBS,
+};
+
/* Maximum number of support PMIC peripherals */
#define PMIC_ARB_MAX_PERIPHS 512
#define PMIC_ARB_TIMEOUT_US 100
@@ -112,7 +123,8 @@ enum pmic_arb_cmd_op_code {

struct apid_data {
u16 ppid;
- u8 owner;
+ u8 write_ee;
+ u8 irq_ee;
};

/**
@@ -175,12 +187,14 @@ struct spmi_pmic_arb {
* on v2 address of SPMI_PIC_IRQ_STATUSn.
* @irq_clear: on v1 address of PMIC_ARB_SPMI_PIC_IRQ_CLEARn
* on v2 address of SPMI_PIC_IRQ_CLEARn.
+ * @apid_map_offset: offset of PMIC_ARB_REG_CHNLn
*/
struct pmic_arb_ver_ops {
const char *ver_str;
int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
/* spmi commands (read_cmd, write_cmd, cmd) functionality */
- int (*offset)(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr);
+ int (*offset)(struct spmi_pmic_arb *dev, u8 sid, u16 addr,
+ enum pmic_arb_channel ch_type);
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) */
@@ -189,6 +203,7 @@ struct pmic_arb_ver_ops {
void __iomem *(*acc_enable)(struct spmi_pmic_arb *pmic_arb, u16 n);
void __iomem *(*irq_status)(struct spmi_pmic_arb *pmic_arb, u16 n);
void __iomem *(*irq_clear)(struct spmi_pmic_arb *pmic_arb, u16 n);
+ u32 (*apid_map_offset)(u16 n);
};

static inline void pmic_arb_base_write(struct spmi_pmic_arb *pmic_arb,
@@ -233,7 +248,8 @@ static void pmic_arb_write_data(struct spmi_pmic_arb *pmic_arb, const u8 *buf,
}

static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
- void __iomem *base, u8 sid, u16 addr)
+ void __iomem *base, u8 sid, u16 addr,
+ enum pmic_arb_channel ch_type)
{
struct spmi_pmic_arb *pmic_arb = spmi_controller_get_drvdata(ctrl);
u32 status = 0;
@@ -241,7 +257,7 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
u32 offset;
int rc;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, ch_type);
if (rc < 0)
return rc;

@@ -289,7 +305,7 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, 0);
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, 0, PMIC_ARB_CHANNEL_RW);
if (rc < 0)
return rc;

@@ -298,7 +314,8 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,

raw_spin_lock_irqsave(&pmic_arb->lock, flags);
pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
- rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0);
+ rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0,
+ PMIC_ARB_CHANNEL_RW);
raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);

return rc;
@@ -334,7 +351,8 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr,
+ PMIC_ARB_CHANNEL_OBS);
if (rc < 0)
return rc;

@@ -359,7 +377,8 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,

raw_spin_lock_irqsave(&pmic_arb->lock, flags);
pmic_arb_set_rd_cmd(pmic_arb, offset + PMIC_ARB_CMD, cmd);
- rc = pmic_arb_wait_for_done(ctrl, pmic_arb->rd_base, sid, addr);
+ rc = pmic_arb_wait_for_done(ctrl, pmic_arb->rd_base, sid, addr,
+ PMIC_ARB_CHANNEL_OBS);
if (rc)
goto done;

@@ -385,7 +404,8 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr,
+ PMIC_ARB_CHANNEL_RW);
if (rc < 0)
return rc;

@@ -420,7 +440,8 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,

/* Start the transaction */
pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
- rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr);
+ rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr,
+ PMIC_ARB_CHANNEL_RW);
raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);

return rc;
@@ -681,12 +702,19 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
ppid = intspec[0] << 8 | intspec[1];
rc = pmic_arb->ver_ops->ppid_to_apid(pmic_arb, ppid);
if (rc < 0) {
- dev_err(&pmic_arb->spmic->dev, "failed to xlate sid = 0x%x, periph = 0x%x, irq = %x rc = %d\n",
+ dev_err(&pmic_arb->spmic->dev, "failed to xlate sid = %#x, periph = %#x, irq = %u rc = %d\n",
intspec[0], intspec[1], intspec[2], rc);
return rc;
}

apid = rc;
+ if (pmic_arb->apid_data[apid].irq_ee != pmic_arb->ee) {
+ dev_err(&pmic_arb->spmic->dev, "failed to xlate sid = %#x, periph = %#x, irq = %u: ee=%u but owner=%u\n",
+ intspec[0], intspec[1], intspec[2], pmic_arb->ee,
+ pmic_arb->apid_data[apid].irq_ee);
+ return -ENODEV;
+ }
+
/* Keep track of {max,min}_apid for bounding search during interrupt */
if (apid > pmic_arb->max_apid)
pmic_arb->max_apid = apid;
@@ -763,7 +791,8 @@ static int pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pmic_arb, u16 ppid)
}

/* v1 offset per ee */
-static int pmic_arb_offset_v1(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr)
+static int pmic_arb_offset_v1(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
+ enum pmic_arb_channel ch_type)
{
return 0x800 + 0x80 * pmic_arb->channel;
}
@@ -779,13 +808,14 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
* ppid_to_apid is an in-memory invert of that table.
*/
for (i = pmic_arb->last_apid; ; i++, apid_info++) {
- offset = PMIC_ARB_REG_CHNL(i);
+ offset = pmic_arb->ver_ops->apid_map_offset(i);
if (offset >= pmic_arb->core_size)
break;

regval = readl_relaxed(pmic_arb->cnfg +
SPMI_OWNERSHIP_TABLE_REG(i));
- apid_info->owner = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
+ apid_info->irq_ee = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
+ apid_info->write_ee = apid_info->irq_ee;

regval = readl_relaxed(pmic_arb->core + offset);
if (!regval)
@@ -817,8 +847,87 @@ static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u16 ppid)
return apid_valid & ~PMIC_ARB_APID_VALID;
}

+static int pmic_arb_read_apid_map_v5(struct spmi_pmic_arb *pmic_arb)
+{
+ struct apid_data *apid_info = pmic_arb->apid_data;
+ struct apid_data *prev_apid_info;
+ u16 i, j, ppid;
+ bool valid, is_irq_ee;
+ u32 regval, offset;
+
+ /*
+ * PMIC_ARB_REG_CHNL is a table in HW mapping APID (channel) to PPID.
+ * ppid_to_apid is an in-memory invert of that table. In order to allow
+ * multiple EEs to write to a single PPID in arbiter version 5, there
+ * is more than one APID mapped to each PPID. The owner field for each
+ * of these mappings specifies the EE which is allowed to write to the
+ * APID. The owner of the last (highest) APID for a given PPID will
+ * receive interrupts from the PPID.
+ */
+ for (i = 0; ; i++, apid_info++) {
+ offset = pmic_arb->ver_ops->apid_map_offset(i);
+ if (offset >= pmic_arb->core_size)
+ break;
+
+ regval = readl_relaxed(pmic_arb->core + offset);
+ if (!regval)
+ continue;
+ ppid = (regval >> 8) & PMIC_ARB_PPID_MASK;
+ is_irq_ee = PMIC_ARB_CHAN_IS_IRQ_OWNER(regval);
+
+ regval = readl_relaxed(pmic_arb->cnfg +
+ SPMI_OWNERSHIP_TABLE_REG(i));
+ apid_info->write_ee = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
+
+ apid_info->irq_ee = is_irq_ee ?
+ apid_info->write_ee : INVALID_EE;
+
+ valid = pmic_arb->ppid_to_apid[ppid] & PMIC_ARB_APID_VALID;
+ j = pmic_arb->ppid_to_apid[ppid] & ~PMIC_ARB_APID_VALID;
+ prev_apid_info = &pmic_arb->apid_data[j];
+
+ if (valid && is_irq_ee &&
+ prev_apid_info->write_ee == pmic_arb->ee) {
+ /*
+ * Duplicate PPID mapping after the one for this EE;
+ * override the irq owner
+ */
+ prev_apid_info->irq_ee = apid_info->irq_ee;
+ } else if (!valid || is_irq_ee) {
+ /* First PPID mapping or duplicate for another EE */
+ pmic_arb->ppid_to_apid[ppid] = i | PMIC_ARB_APID_VALID;
+ }
+
+ apid_info->ppid = ppid;
+ pmic_arb->last_apid = i;
+ }
+
+ /* Dump the mapping table for debug purposes. */
+ dev_dbg(&pmic_arb->spmic->dev, "PPID APID Write-EE IRQ-EE\n");
+ for (ppid = 0; ppid < PMIC_ARB_MAX_PPID; ppid++) {
+ valid = pmic_arb->ppid_to_apid[ppid] & PMIC_ARB_APID_VALID;
+ i = pmic_arb->ppid_to_apid[ppid] & ~PMIC_ARB_APID_VALID;
+ if (valid) {
+ apid_info = &pmic_arb->apid_data[i];
+ dev_dbg(&pmic_arb->spmic->dev, "%#03X %3u %2u %2u\n",
+ ppid, i, apid_info->write_ee, apid_info->irq_ee);
+ }
+ }
+
+ return 0;
+}
+
+static int pmic_arb_ppid_to_apid_v5(struct spmi_pmic_arb *pmic_arb, u16 ppid)
+{
+ if (!(pmic_arb->ppid_to_apid[ppid] & PMIC_ARB_APID_VALID))
+ return -ENODEV;
+
+ return pmic_arb->ppid_to_apid[ppid] & ~PMIC_ARB_APID_VALID;
+}
+
/* v2 offset per ppid and per ee */
-static int pmic_arb_offset_v2(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr)
+static int pmic_arb_offset_v2(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
+ enum pmic_arb_channel ch_type)
{
u16 apid;
u16 ppid;
@@ -833,6 +942,35 @@ static int pmic_arb_offset_v2(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr)
return 0x1000 * pmic_arb->ee + 0x8000 * apid;
}

+/*
+ * v5 offset per ee and per apid for observer channels and per apid for
+ * read/write channels.
+ */
+static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
+ enum pmic_arb_channel ch_type)
+{
+ u16 apid;
+ int rc;
+ u32 offset = 0;
+ u16 ppid = (sid << 8) | (addr >> 8);
+
+ rc = pmic_arb_ppid_to_apid_v5(pmic_arb, ppid);
+ if (rc < 0)
+ return rc;
+
+ apid = rc;
+ switch (ch_type) {
+ case PMIC_ARB_CHANNEL_OBS:
+ offset = 0x10000 * pmic_arb->ee + 0x80 * apid;
+ break;
+ case PMIC_ARB_CHANNEL_RW:
+ offset = 0x10000 * apid;
+ break;
+ }
+
+ return offset;
+}
+
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);
@@ -862,6 +1000,12 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
}

static void __iomem *
+pmic_arb_owner_acc_status_v5(struct spmi_pmic_arb *pmic_arb, u8 m, u16 n)
+{
+ return pmic_arb->intr + 0x10000 * m + 0x4 * n;
+}
+
+static void __iomem *
pmic_arb_acc_enable_v1(struct spmi_pmic_arb *pmic_arb, u16 n)
{
return pmic_arb->intr + 0x200 + 0x4 * n;
@@ -874,6 +1018,12 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
}

static void __iomem *
+pmic_arb_acc_enable_v5(struct spmi_pmic_arb *pmic_arb, u16 n)
+{
+ return pmic_arb->wr_base + 0x100 + 0x10000 * n;
+}
+
+static void __iomem *
pmic_arb_irq_status_v1(struct spmi_pmic_arb *pmic_arb, u16 n)
{
return pmic_arb->intr + 0x600 + 0x4 * n;
@@ -886,6 +1036,12 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
}

static void __iomem *
+pmic_arb_irq_status_v5(struct spmi_pmic_arb *pmic_arb, u16 n)
+{
+ return pmic_arb->wr_base + 0x104 + 0x10000 * n;
+}
+
+static void __iomem *
pmic_arb_irq_clear_v1(struct spmi_pmic_arb *pmic_arb, u16 n)
{
return pmic_arb->intr + 0xA00 + 0x4 * n;
@@ -897,6 +1053,22 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
return pmic_arb->intr + 0x8 + 0x1000 * n;
}

+static void __iomem *
+pmic_arb_irq_clear_v5(struct spmi_pmic_arb *pmic_arb, u16 n)
+{
+ return pmic_arb->wr_base + 0x108 + 0x10000 * n;
+}
+
+static u32 pmic_arb_apid_map_offset_v2(u16 n)
+{
+ return 0x800 + 0x4 * n;
+}
+
+static u32 pmic_arb_apid_map_offset_v5(u16 n)
+{
+ return 0x900 + 0x4 * n;
+}
+
static const struct pmic_arb_ver_ops pmic_arb_v1 = {
.ver_str = "v1",
.ppid_to_apid = pmic_arb_ppid_to_apid_v1,
@@ -907,6 +1079,7 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
.acc_enable = pmic_arb_acc_enable_v1,
.irq_status = pmic_arb_irq_status_v1,
.irq_clear = pmic_arb_irq_clear_v1,
+ .apid_map_offset = pmic_arb_apid_map_offset_v2,
};

static const struct pmic_arb_ver_ops pmic_arb_v2 = {
@@ -919,6 +1092,7 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
.acc_enable = pmic_arb_acc_enable_v2,
.irq_status = pmic_arb_irq_status_v2,
.irq_clear = pmic_arb_irq_clear_v2,
+ .apid_map_offset = pmic_arb_apid_map_offset_v2,
};

static const struct pmic_arb_ver_ops pmic_arb_v3 = {
@@ -931,6 +1105,20 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
.acc_enable = pmic_arb_acc_enable_v2,
.irq_status = pmic_arb_irq_status_v2,
.irq_clear = pmic_arb_irq_clear_v2,
+ .apid_map_offset = pmic_arb_apid_map_offset_v2,
+};
+
+static const struct pmic_arb_ver_ops pmic_arb_v5 = {
+ .ver_str = "v5",
+ .ppid_to_apid = pmic_arb_ppid_to_apid_v5,
+ .non_data_cmd = pmic_arb_non_data_cmd_v2,
+ .offset = pmic_arb_offset_v5,
+ .fmt_cmd = pmic_arb_fmt_cmd_v2,
+ .owner_acc_status = pmic_arb_owner_acc_status_v5,
+ .acc_enable = pmic_arb_acc_enable_v5,
+ .irq_status = pmic_arb_irq_status_v5,
+ .irq_clear = pmic_arb_irq_clear_v5,
+ .apid_map_offset = pmic_arb_apid_map_offset_v5,
};

static const struct irq_domain_ops pmic_arb_irq_domain_ops = {
@@ -983,8 +1171,10 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)

if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
pmic_arb->ver_ops = &pmic_arb_v2;
- else
+ else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
pmic_arb->ver_ops = &pmic_arb_v3;
+ else
+ pmic_arb->ver_ops = &pmic_arb_v5;

res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"obsrvr");
@@ -1074,6 +1264,15 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
ctrl->read_cmd = pmic_arb_read_cmd;
ctrl->write_cmd = pmic_arb_write_cmd;

+ if (hw_ver >= PMIC_ARB_VERSION_V5_MIN) {
+ err = pmic_arb_read_apid_map_v5(pmic_arb);
+ if (err) {
+ dev_err(&pdev->dev, "could not read APID->PPID mapping table, rc= %d\n",
+ err);
+ goto err_put_ctrl;
+ }
+ }
+
dev_dbg(&pdev->dev, "adding irq domain\n");
pmic_arb->domain = irq_domain_add_tree(pdev->dev.of_node,
&pmic_arb_irq_domain_ops, pmic_arb);