[PATCH V4 0/2] [PATCH V4 0/2] add support for pmic_arb v2 and correct framework

[PATCH V4 0/2] [PATCH V4 0/2] add support for pmic_arb v2 and correct framework

[Gilad Avidov]

pmic_arb v2 has no support for spmi non-data commands and thus
returns -EOPNOTSUPP on .cmd callback. This causes a failure in
spmi_drv_probe() which sends a wakeup command to the slave before
probing its driver. This patchset removes the wakeup from
spmi_drv_probe() since the spmi spec stipulates that a slaves
default state is active and doesn't need a wakeup.

Changelog from v3 to v4:

spmi: remove wakeup command before slave probe:
1. Remove the claim that this is a bug fix off the commit text.

spmi: pmic_arb: add support for hw version 2
1. Unmap the core register space as soon as we know that it will not be used
   (on v2 it is used only to read the hw version in probe).
3. Assign the core reg space to a local until we know if it appropriate to use
   it to configure the controller fields (on v1) or unmap it (on v2).


Gilad Avidov (2):
  spmi: remove wakeup command before slave probe
  spmi: pmic_arb: add support for hw version 2

 .../bindings/spmi/qcom,spmi-pmic-arb.txt           |   6 +-
 drivers/spmi/spmi-pmic-arb.c                       | 315 +++++++++++++++++----
 drivers/spmi/spmi.c                                |   9 +-
 3 files changed, 266 insertions(+), 64 deletions(-)

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

[PATCH V4 1/2] spmi: remove wakeup command before slave probe

[Gilad Avidov]

According to spmi spec a slave powers up into startup state and then
transitions into active state. Thus, the wakeup command is not required
before calling the slave's probe. The wakeup command is only needed for
slaves that are in sleep state after receiving the sleep command.

Cc: galak@codeaurora.org
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Sagar Dharia <sdharia@codeaurora.org>
Acked-by: Josh Cartwright <joshc@eso.teric.us>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
---
 drivers/spmi/spmi.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
index 1d92f51..9493843 100644
--- a/drivers/spmi/spmi.c
+++ b/drivers/spmi/spmi.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+/*
+ * 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
@@ -316,11 +317,6 @@ static int spmi_drv_probe(struct device *dev)
 	struct spmi_device *sdev = to_spmi_device(dev);
 	int err;
 
-	/* Ensure the slave is in ACTIVE state */
-	err = spmi_command_wakeup(sdev);
-	if (err)
-		goto fail_wakeup;
-
 	pm_runtime_get_noresume(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
@@ -335,7 +331,6 @@ fail_probe:
 	pm_runtime_disable(dev);
 	pm_runtime_set_suspended(dev);
 	pm_runtime_put_noidle(dev);
-fail_wakeup:
 	return err;
 }
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

[PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Gilad Avidov]

Qualcomm PMIC Arbiter version-2 changes from version-1 are:

- Some different register offsets.
- New channel register space, one per PMIC peripheral (ppid).
  All tx traffic uses these channels.
- New observer register space. All rx trafic uses this space.
- Different command format for spmi command registers.

Acked-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
---
 .../bindings/spmi/qcom,spmi-pmic-arb.txt           |   6 +-
 drivers/spmi/spmi-pmic-arb.c                       | 315 +++++++++++++++++----
 2 files changed, 264 insertions(+), 57 deletions(-)

diff --git a/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
index 715d099..e16b9b5 100644
--- a/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
+++ b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
@@ -1,6 +1,6 @@
 Qualcomm SPMI Controller (PMIC Arbiter)
 
-The SPMI PMIC Arbiter is found on the Snapdragon 800 Series.  It is an SPMI
+The SPMI PMIC Arbiter is found on Snapdragon chipsets.  It is an SPMI
 controller with wrapping arbitration logic to allow for multiple on-chip
 devices to control a single SPMI master.
 
@@ -19,6 +19,10 @@ Required properties:
      "core" - core registers
      "intr" - interrupt controller registers
      "cnfg" - configuration registers
+   Registers used only for V2 PMIC Arbiter:
+     "chnls"  - tx-channel per virtual slave registers.
+     "obsrvr" - rx-channel (called observer) per virtual slave registers.
+
 - reg : address + size pairs describing the PMIC arb register sets; order must
         correspond with the order of entries in reg-names
 - #address-cells : must be set to 2
diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 20559ab..034fb8a 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+/*
+ * 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
@@ -25,22 +26,18 @@
 
 /* PMIC Arbiter configuration registers */
 #define PMIC_ARB_VERSION		0x0000
+#define PMIC_ARB_VERSION_V2_MIN		0x20010000
 #define PMIC_ARB_INT_EN			0x0004
 
-/* PMIC Arbiter channel registers */
-#define PMIC_ARB_CMD(N)			(0x0800 + (0x80 * (N)))
-#define PMIC_ARB_CONFIG(N)		(0x0804 + (0x80 * (N)))
-#define PMIC_ARB_STATUS(N)		(0x0808 + (0x80 * (N)))
-#define PMIC_ARB_WDATA0(N)		(0x0810 + (0x80 * (N)))
-#define PMIC_ARB_WDATA1(N)		(0x0814 + (0x80 * (N)))
-#define PMIC_ARB_RDATA0(N)		(0x0818 + (0x80 * (N)))
-#define PMIC_ARB_RDATA1(N)		(0x081C + (0x80 * (N)))
-
-/* Interrupt Controller */
-#define SPMI_PIC_OWNER_ACC_STATUS(M, N)	(0x0000 + ((32 * (M)) + (4 * (N))))
-#define SPMI_PIC_ACC_ENABLE(N)		(0x0200 + (4 * (N)))
-#define SPMI_PIC_IRQ_STATUS(N)		(0x0600 + (4 * (N)))
-#define SPMI_PIC_IRQ_CLEAR(N)		(0x0A00 + (4 * (N)))
+/* 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)))
@@ -52,6 +49,7 @@
 
 #define SPMI_MAPPING_TABLE_LEN		255
 #define SPMI_MAPPING_TABLE_TREE_DEPTH	16	/* Maximum of 16-bits */
+#define PPID_TO_CHAN_TABLE_SZ		BIT(12)	/* PPID is 12bit chan is 1byte*/
 
 /* Ownership Table */
 #define SPMI_OWNERSHIP_TABLE_REG(N)	(0x0700 + (4 * (N)))
@@ -88,6 +86,7 @@ enum pmic_arb_cmd_op_code {
 
 /* Maximum number of support PMIC peripherals */
 #define PMIC_ARB_MAX_PERIPHS		256
+#define PMIC_ARB_MAX_CHNL		128
 #define PMIC_ARB_PERIPH_ID_VALID	(1 << 15)
 #define PMIC_ARB_TIMEOUT_US		100
 #define PMIC_ARB_MAX_TRANS_BYTES	(8)
@@ -98,14 +97,17 @@ enum pmic_arb_cmd_op_code {
 /* interrupt enable bit */
 #define SPMI_PIC_ACC_ENABLE_BIT		BIT(0)
 
+struct pmic_arb_ver_ops;
+
 /**
  * spmi_pmic_arb_dev - SPMI PMIC Arbiter object
  *
- * @base:		address of the PMIC Arbiter core registers.
+ * @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:		which channel to use for accesses.
+ * @channel:		which ee channel to use for accesses.
  * @irq:		PMIC ARB interrupt.
  * @ee:			the current Execution Environment
  * @min_apid:		minimum APID (used for bounding IRQ search)
@@ -113,10 +115,14 @@ enum pmic_arb_cmd_op_code {
  * @mapping_table:	in-memory copy of PPID -> APID mapping table.
  * @domain:		irq domain object for PMIC IRQ domain
  * @spmic:		SPMI controller object
- * @apid_to_ppid:	cached mapping from APID to PPID
+ * @apid_to_ppid:	in-memory copy of APID -> PPID mapping table.
+ * @ver_ops:		version dependent operations.
+ * @ppid_to_chan	in-memory copy of PPID -> channel (APID) mapping table.
+ *			v2 only.
  */
 struct spmi_pmic_arb_dev {
-	void __iomem		*base;
+	void __iomem		*rd_base;
+	void __iomem		*wr_base;
 	void __iomem		*intr;
 	void __iomem		*cnfg;
 	raw_spinlock_t		lock;
@@ -129,17 +135,54 @@ struct spmi_pmic_arb_dev {
 	struct irq_domain	*domain;
 	struct spmi_controller	*spmic;
 	u16			apid_to_ppid[256];
+	const struct pmic_arb_ver_ops *ver_ops;
+	u8			*ppid_to_chan;
+};
+
+/**
+ * pmic_arb_ver: version dependent functionality.
+ *
+ * @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 {
+	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
+	u32 (*offset)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr);
+	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, u8 n);
+	u32 (*acc_enable)(u8 n);
+	u32 (*irq_status)(u8 n);
+	u32 (*irq_clear)(u8 n);
 };
 
 static inline u32 pmic_arb_base_read(struct spmi_pmic_arb_dev *dev, u32 offset)
 {
-	return readl_relaxed(dev->base + offset);
+	return readl_relaxed(dev->rd_base + offset);
 }
 
 static inline void pmic_arb_base_write(struct spmi_pmic_arb_dev *dev,
 				       u32 offset, u32 val)
 {
-	writel_relaxed(val, dev->base + offset);
+	writel_relaxed(val, dev->wr_base + offset);
+}
+
+static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb_dev *dev,
+				       u32 offset, u32 val)
+{
+	writel_relaxed(val, dev->rd_base + offset);
 }
 
 /**
@@ -168,12 +211,13 @@ pa_write_data(struct spmi_pmic_arb_dev *dev, const u8 *buf, u32 reg, u8 bc)
 	pmic_arb_base_write(dev, reg, data);
 }
 
-static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
+static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
+				  void __iomem *base, u8 sid, u16 addr)
 {
 	struct spmi_pmic_arb_dev *dev = spmi_controller_get_drvdata(ctrl);
 	u32 status = 0;
 	u32 timeout = PMIC_ARB_TIMEOUT_US;
-	u32 offset = PMIC_ARB_STATUS(dev->channel);
+	u32 offset = dev->ver_ops->offset(dev, sid, addr) + PMIC_ARB_STATUS;
 
 	while (timeout--) {
 		status = pmic_arb_base_read(dev, offset);
@@ -211,28 +255,45 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
 	return -ETIMEDOUT;
 }
 
-/* Non-data command */
-static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
+static int
+pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid)
 {
 	struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
 	unsigned long flags;
 	u32 cmd;
 	int rc;
-
-	/* Check for valid non-data command */
-	if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
-		return -EINVAL;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, 0);
 
 	cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);
 
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
+	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0);
 	raw_spin_unlock_irqrestore(&pmic_arb->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_dev *pmic_arb = 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 pmic_arb->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)
 {
@@ -241,6 +302,7 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	u8 bc = len - 1;
 	u32 cmd;
 	int rc;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
 
 	if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
 		dev_err(&ctrl->dev,
@@ -259,20 +321,20 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	else
 		return -EINVAL;
 
-	cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
+	cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
 
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	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);
 	if (rc)
 		goto done;
 
-	pa_read_data(pmic_arb, buf, PMIC_ARB_RDATA0(pmic_arb->channel),
+	pa_read_data(pmic_arb, buf, offset + PMIC_ARB_RDATA0,
 		     min_t(u8, bc, 3));
 
 	if (bc > 3)
 		pa_read_data(pmic_arb, buf + 4,
-				PMIC_ARB_RDATA1(pmic_arb->channel), bc - 4);
+				offset + PMIC_ARB_RDATA1, bc - 4);
 
 done:
 	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
@@ -287,6 +349,7 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	u8 bc = len - 1;
 	u32 cmd;
 	int rc;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
 
 	if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
 		dev_err(&ctrl->dev,
@@ -307,19 +370,19 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	else
 		return -EINVAL;
 
-	cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
+	cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
 
 	/* Write data to FIFOs */
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pa_write_data(pmic_arb, buf, PMIC_ARB_WDATA0(pmic_arb->channel)
-							, min_t(u8, bc, 3));
+	pa_write_data(pmic_arb, buf, offset + PMIC_ARB_WDATA0,
+		      min_t(u8, bc, 3));
 	if (bc > 3)
 		pa_write_data(pmic_arb, buf + 4,
-				PMIC_ARB_WDATA1(pmic_arb->channel), bc - 4);
+				offset + PMIC_ARB_WDATA1, bc - 4);
 
 	/* Start the transaction */
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
+	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr);
 	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
 
 	return rc;
@@ -376,7 +439,7 @@ static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid)
 	u32 status;
 	int id;
 
-	status = readl_relaxed(pa->intr + SPMI_PIC_IRQ_STATUS(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid));
 	while (status) {
 		id = ffs(status) - 1;
 		status &= ~(1 << id);
@@ -402,7 +465,7 @@ static void pmic_arb_chained_irq(unsigned int irq, struct irq_desc *desc)
 
 	for (i = first; i <= last; ++i) {
 		status = readl_relaxed(intr +
-				       SPMI_PIC_OWNER_ACC_STATUS(pa->ee, i));
+				      pa->ver_ops->owner_acc_status(pa->ee, i));
 		while (status) {
 			id = ffs(status) - 1;
 			status &= ~(1 << id);
@@ -422,7 +485,7 @@ static void qpnpint_irq_ack(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	writel_relaxed(1 << irq, pa->intr + SPMI_PIC_IRQ_CLEAR(apid));
+	writel_relaxed(1 << irq, pa->intr + pa->ver_ops->irq_clear(apid));
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
 	data = 1 << irq;
@@ -439,10 +502,11 @@ static void qpnpint_irq_mask(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
 	if (status & SPMI_PIC_ACC_ENABLE_BIT) {
 		status = status & ~SPMI_PIC_ACC_ENABLE_BIT;
-		writel_relaxed(status, pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+		writel_relaxed(status, pa->intr +
+			       pa->ver_ops->acc_enable(apid));
 	}
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
@@ -460,10 +524,10 @@ static void qpnpint_irq_unmask(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
 	if (!(status & SPMI_PIC_ACC_ENABLE_BIT)) {
 		writel_relaxed(status | SPMI_PIC_ACC_ENABLE_BIT,
-				pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+				pa->intr + pa->ver_ops->acc_enable(apid));
 	}
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
@@ -624,6 +688,91 @@ static int qpnpint_irq_domain_map(struct irq_domain *d,
 	return 0;
 }
 
+/* v1 offset per ee */
+static u32 pmic_arb_offset_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
+{
+	return 0x800 + 0x80 * pa->channel;
+}
+
+/* v2 offset per ppid (chan) and per ee */
+static u32 pmic_arb_offset_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
+{
+	u16 ppid = (sid << 8) | (addr >> 8);
+	u8  chan = pa->ppid_to_chan[ppid];
+
+	return 0x1000 * pa->ee + 0x8000 * chan;
+}
+
+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, u8 n)
+{
+	return 0x20 * m + 0x4 * n;
+}
+
+static u32 pmic_arb_owner_acc_status_v2(u8 m, u8 n)
+{
+	return 0x100000 + 0x1000 * m + 0x4 * n;
+}
+
+static u32 pmic_arb_acc_enable_v1(u8 n)
+{
+	return 0x200 + 0x4 * n;
+}
+
+static u32 pmic_arb_acc_enable_v2(u8 n)
+{
+	return 0x1000 * n;
+}
+
+static u32 pmic_arb_irq_status_v1(u8 n)
+{
+	return 0x600 + 0x4 * n;
+}
+
+static u32 pmic_arb_irq_status_v2(u8 n)
+{
+	return 0x4 + 0x1000 * n;
+}
+
+static u32 pmic_arb_irq_clear_v1(u8 n)
+{
+	return 0xA00 + 0x4 * n;
+}
+
+static u32 pmic_arb_irq_clear_v2(u8 n)
+{
+	return 0x8 + 0x1000 * n;
+}
+
+static const struct pmic_arb_ver_ops pmic_arb_v1 = {
+	.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 = {
+	.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 irq_domain_ops pmic_arb_irq_domain_ops = {
 	.map	= qpnpint_irq_domain_map,
 	.xlate	= qpnpint_irq_domain_dt_translate,
@@ -634,8 +783,10 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	struct spmi_pmic_arb_dev *pa;
 	struct spmi_controller *ctrl;
 	struct resource *res;
-	u32 channel, ee;
+	void __iomem *core;
+	u32 channel, ee, hw_ver;
 	int err, i;
+	bool is_v1;
 
 	ctrl = spmi_controller_alloc(&pdev->dev, sizeof(*pa));
 	if (!ctrl)
@@ -645,12 +796,67 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	pa->spmic = ctrl;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
-	pa->base = devm_ioremap_resource(&ctrl->dev, res);
-	if (IS_ERR(pa->base)) {
-		err = PTR_ERR(pa->base);
+	core = devm_ioremap_resource(&ctrl->dev, res);
+	if (IS_ERR(core)) {
+		err = PTR_ERR(core);
 		goto err_put_ctrl;
 	}
 
+	hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
+	is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
+
+	dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2),
+		hw_ver);
+
+	if (is_v1) {
+		pa->ver_ops = &pmic_arb_v1;
+		pa->wr_base = core;
+		pa->rd_base = core;
+	} else {
+		u8  chan;
+		u16 ppid;
+		u32 regval;
+
+		pa->ver_ops = &pmic_arb_v2;
+		devm_iounmap(&ctrl->dev, core);
+
+		pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
+					PPID_TO_CHAN_TABLE_SZ, GFP_KERNEL);
+		if (!pa->ppid_to_chan) {
+			err = -ENOMEM;
+			goto err_put_ctrl;
+		}
+		/*
+		 * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
+		 * ppid_to_chan is an in-memory invert of that table.
+		 */
+		for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
+			regval = readl_relaxed(pa->rd_base +
+					       PMIC_ARB_REG_CHNL(chan));
+			if (!regval)
+				continue;
+
+			ppid = (regval >> 8) & 0xFFF;
+			pa->ppid_to_chan[ppid] = chan;
+		}
+
+		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;
+		}
+	}
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr");
 	pa->intr = devm_ioremap_resource(&ctrl->dev, res);
 	if (IS_ERR(pa->intr)) {
@@ -731,9 +937,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	if (err)
 		goto err_domain_remove;
 
-	dev_dbg(&ctrl->dev, "PMIC Arb Version 0x%x\n",
-		pmic_arb_base_read(pa, PMIC_ARB_VERSION));
-
 	return 0;
 
 err_domain_remove:
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Ivan T. Ivanov]

Hi Gilad,

On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> Qualcomm PMIC Arbiter version-2 changes from version-1 are:
> 
> - Some different register offsets.
> - New channel register space, one per PMIC peripheral (ppid).
>   All tx traffic uses these channels.
> - New observer register space. All rx trafic uses this space.
> - Different command format for spmi command registers.
> 
> Acked-by: Sagar Dharia <sdharia@codeaurora.org>
> Signed-off-by: Gilad Avidov <gavidov@codeaurora.org
> 

<snip>

> @@ -645,12 +796,67 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
>         pa->spmic = ctrl;
> 
>         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
> -       pa->base = devm_ioremap_resource(&ctrl->dev, res);
> -       if (IS_ERR(pa->base)) {
> -               err = PTR_ERR(pa->base);
> +       core = devm_ioremap_resource(&ctrl->dev, res);
> +       if (IS_ERR(core)) {
> +               err = PTR_ERR(core);
>                 goto err_put_ctrl;
>         }
> 
> +       hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
> +       is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
> +
> +       dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2),
> +               hw_ver);
> +
> +       if (is_v1) {
> +               pa->ver_ops = &pmic_arb_v1;
> +               pa->wr_base = core;
> +               pa->rd_base = core;
> +       } else {
> +               u8  chan;
> +               u16 ppid;
> +               u32 regval;
> +
> +               pa->ver_ops = &pmic_arb_v2;
> +               devm_iounmap(&ctrl->dev, core);
> +
> +               pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
> +                                       PPID_TO_CHAN_TABLE_SZ, GFP_KERNEL);
> +               if (!pa->ppid_to_chan) {
> +                       err = -ENOMEM;
> +                       goto err_put_ctrl;
> +               }
> +               /*
> +                       * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
> +                       * ppid_to_chan is an in-memory invert of that table.
> +                       */
> +               for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
> +                       regval = readl_relaxed(pa->rd_base +

rd_base is not initialized at this point.

> +                                                                                               
> PMIC_ARB_REG_CHNL(chan));
> +                       if (!regval)
> +                               continue;
> +
> +                       ppid = (regval >> 8) & 0xFFF;
> +                       pa->ppid_to_chan[ppid] = chan;
> +               }
> +
> +               res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +                                                                       "obsrvr");
> +               pa->rd_base = devm_ioremap_resource(&ctrl->dev, res);

and they are compile warnings:

drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_read_cmd’:
drivers/spmi/spmi-pmic-arb.c:310:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
    PMIC_ARB_MAX_TRANS_BYTES, len);
    ^
drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_write_cmd’:
drivers/spmi/spmi-pmic-arb.c:357:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
    PMIC_ARB_MAX_TRANS_BYTES, len);
    ^

Ivan

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Ivan T. Ivanov]

Hi Gilad, 

On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:

> 
> +
> +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);

This one is looking suspicious. Address could be only 8 bits? Slave ID is not used?

Is this correct?

Ivan

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Ivan T. Ivanov]

Hi Gilad,

One more comment :-).

On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:

<snip>


-static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
+static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
+                                               void __iomem *base, u8 sid, u16 addr)
 {
        struct spmi_pmic_arb_dev *dev = spmi_controller_get_drvdata(ctrl);
        u32 status = 0;
        u32 timeout = PMIC_ARB_TIMEOUT_US;
-       u32 offset = PMIC_ARB_STATUS(dev->channel);
+       u32 offset = dev->ver_ops->offset(dev, sid, addr) + PMIC_ARB_STATUS;


        while (timeout--) {
                status = pmic_arb_base_read(dev, offset);

I see that downstream driver is using read or write base address
based on operation for which we are waiting (read_cmd/write_cmd).

Should this be reflected here?

Ivan.

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Ivan T. Ivanov]

Ping.

On Mon, 2015-02-23 at 11:59 +0200, Ivan T. Ivanov wrote:
> Hi Gilad,
> 
> On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> > Qualcomm PMIC Arbiter version-2 changes from version-1 are:
> > 
> > - Some different register offsets.
> > - New channel register space, one per PMIC peripheral (ppid).
> >   All tx traffic uses these channels.
> > - New observer register space. All rx trafic uses this space.
> > - Different command format for spmi command registers.
> > 
> > Acked-by: Sagar Dharia <sdharia@codeaurora.org>
> > Signed-off-by: Gilad Avidov <gavidov@codeaurora.org
> > 
> 
> <snip>
> 
> > @@ -645,12 +796,67 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
> >         pa->spmic = ctrl;
> > 
> >         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
> > -       pa->base = devm_ioremap_resource(&ctrl->dev, res);
> > -       if (IS_ERR(pa->base)) {
> > -               err = PTR_ERR(pa->base);
> > +       core = devm_ioremap_resource(&ctrl->dev, res);
> > +       if (IS_ERR(core)) {
> > +               err = PTR_ERR(core);
> >                 goto err_put_ctrl;
> >         }
> > 
> > +       hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
> > +       is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
> > +
> > +       dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2),
> > +               hw_ver);
> > +
> > +       if (is_v1) {
> > +               pa->ver_ops = &pmic_arb_v1;
> > +               pa->wr_base = core;
> > +               pa->rd_base = core;
> > +       } else {
> > +               u8  chan;
> > +               u16 ppid;
> > +               u32 regval;
> > +
> > +               pa->ver_ops = &pmic_arb_v2;
> > +               devm_iounmap(&ctrl->dev, core);
> > +
> > +               pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
> > +                                       PPID_TO_CHAN_TABLE_SZ, GFP_KERNEL);
> > +               if (!pa->ppid_to_chan) {
> > +                       err = -ENOMEM;
> > +                       goto err_put_ctrl;
> > +               }
> > +               /*
> > +                       * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
> > +                       * ppid_to_chan is an in-memory invert of that table.
> > +                       */
> > +               for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
> > +                       regval = readl_relaxed(pa->rd_base +
> 
> rd_base is not initialized at this point.
> 
> > +
> > PMIC_ARB_REG_CHNL(chan));
> > +                       if (!regval)
> > +                               continue;
> > +
> > +                       ppid = (regval >> 8) & 0xFFF;
> > +                       pa->ppid_to_chan[ppid] = chan;
> > +               }
> > +
> > +               res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > +                                                                       "obsrvr");
> > +               pa->rd_base = devm_ioremap_resource(&ctrl->dev, res);
> 
> and they are compile warnings:
> 
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_read_cmd’:
> drivers/spmi/spmi-pmic-arb.c:310:4: warning: format ‘%d’ expects argument of type ‘int’, but 
> argument 4 has type ‘size_t’ [-Wformat=]
>     PMIC_ARB_MAX_TRANS_BYTES, len);
>     ^
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_write_cmd’:
> drivers/spmi/spmi-pmic-arb.c:357:4: warning: format ‘%d’ expects argument of type ‘int’, but 
> argument 4 has type ‘size_t’ [-Wformat=]
>     PMIC_ARB_MAX_TRANS_BYTES, len);
>     ^
> 
> Ivan
> 

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Gilad Avidov]

Hi Ivan,

On Tue, 24 Feb 2015 13:01:08 +0200
"Ivan T. Ivanov" <iivanov@mm-sol.com> wrote:

> 
> Hi Gilad,
> 
> One more comment :-).
> 
> On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> 
> <snip>
> 
> 
> -static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
> +static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
> +                                               void __iomem *base,
> u8 sid, u16 addr) {
>         struct spmi_pmic_arb_dev *dev =
> spmi_controller_get_drvdata(ctrl); u32 status = 0;
>         u32 timeout = PMIC_ARB_TIMEOUT_US;
> -       u32 offset = PMIC_ARB_STATUS(dev->channel);
> +       u32 offset = dev->ver_ops->offset(dev, sid, addr) +
> PMIC_ARB_STATUS;
> 
> 
>         while (timeout--) {
>                 status = pmic_arb_base_read(dev, offset);
> 
> I see that downstream driver is using read or write base address
> based on operation for which we are waiting (read_cmd/write_cmd).
> 
> Should this be reflected here?

Good catch, it should (although it still works fine). 
I'll fix that.

Gilad.

> 
> Ivan.
> 

Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Gilad Avidov]

Hi Ivan,

On Mon, 23 Feb 2015 18:06:10 +0200
"Ivan T. Ivanov" <iivanov@mm-sol.com> wrote:

> 
> Hi Gilad, 
> 
> On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> 
> > 
> > +
> > +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);
> 
> This one is looking suspicious. Address could be only 8 bits? Slave
> ID is not used?
> 
> Is this correct?

Yes it is correct.
On HW v2 we are writing the command directly to a channel which is
specific (already configured) to an SID and the upper 8 bits of the
address. 
This is how we get the channel:
u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);

The lower 8 bits of the address is all that we need to have the
entire 20bits of SPMI addressing.

Thanks,
Gilad

> 
> Ivan
> --
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Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

[Gilad Avidov]

Hi Ivan,

On Mon, 23 Feb 2015 11:59:14 +0200
"Ivan T. Ivanov" <iivanov@mm-sol.com> wrote:

> Hi Gilad,
> 
> On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> > Qualcomm PMIC Arbiter version-2 changes from version-1 are:
> > 
> > - Some different register offsets.
> > - New channel register space, one per PMIC peripheral (ppid).
> >   All tx traffic uses these channels.
> > - New observer register space. All rx trafic uses this space.
> > - Different command format for spmi command registers.
> > 
> > Acked-by: Sagar Dharia <sdharia@codeaurora.org>
> > Signed-off-by: Gilad Avidov <gavidov@codeaurora.org
> > 
> 
> <snip>
> 
> > @@ -645,12 +796,67 @@ static int spmi_pmic_arb_probe(struct
> > platform_device *pdev) pa->spmic = ctrl;
> > 
> >         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "core");
> > -       pa->base = devm_ioremap_resource(&ctrl->dev, res);
> > -       if (IS_ERR(pa->base)) {
> > -               err = PTR_ERR(pa->base);
> > +       core = devm_ioremap_resource(&ctrl->dev, res);
> > +       if (IS_ERR(core)) {
> > +               err = PTR_ERR(core);
> >                 goto err_put_ctrl;
> >         }
> > 
> > +       hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
> > +       is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
> > +
> > +       dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n",
> > (is_v1 ? 1 : 2),
> > +               hw_ver);
> > +
> > +       if (is_v1) {
> > +               pa->ver_ops = &pmic_arb_v1;
> > +               pa->wr_base = core;
> > +               pa->rd_base = core;
> > +       } else {
> > +               u8  chan;
> > +               u16 ppid;
> > +               u32 regval;
> > +
> > +               pa->ver_ops = &pmic_arb_v2;
> > +               devm_iounmap(&ctrl->dev, core);
> > +
> > +               pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
> > +                                       PPID_TO_CHAN_TABLE_SZ,
> > GFP_KERNEL);
> > +               if (!pa->ppid_to_chan) {
> > +                       err = -ENOMEM;
> > +                       goto err_put_ctrl;
> > +               }
> > +               /*
> > +                       * PMIC_ARB_REG_CHNL is a table in HW
> > mapping channel to ppid.
> > +                       * ppid_to_chan is an in-memory invert of
> > that table.
> > +                       */
> > +               for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
> > +                       regval = readl_relaxed(pa->rd_base +
> 
> rd_base is not initialized at this point.

correct.

> 
> > +                                                                                               
> > PMIC_ARB_REG_CHNL(chan));
> > +                       if (!regval)
> > +                               continue;
> > +
> > +                       ppid = (regval >> 8) & 0xFFF;
> > +                       pa->ppid_to_chan[ppid] = chan;
> > +               }
> > +
> > +               res = platform_get_resource_byname(pdev,
> > IORESOURCE_MEM,
> > +
> > "obsrvr");
> > +               pa->rd_base = devm_ioremap_resource(&ctrl->dev,
> > res);
> 
> and they are compile warnings:
> 
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_read_cmd’:
> drivers/spmi/spmi-pmic-arb.c:310:4: warning: format ‘%d’ expects
> argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
> PMIC_ARB_MAX_TRANS_BYTES, len); ^
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_write_cmd’:
> drivers/spmi/spmi-pmic-arb.c:357:4: warning: format ‘%d’ expects
> argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
> PMIC_ARB_MAX_TRANS_BYTES, len); ^
> 
> Ivan

Sorry about that. I'll fix it.

Thanks,
Gilad