[PATCH 2/6 v4] spmi: msm: add arbiter version 5 support

[Dzmitry Sankouski <dsankouski@gmail.com>]

Currently driver supports only version 1 and 2.
Version 5 has slightly different registers structure

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
---
Changes for v2:
- change string formats in debug statements
Changes for v3:
- remove if else braces where possible
Changes for v4:
- change variable type to fix pointer cast warning

 MAINTAINERS             |   1 +
 drivers/spmi/spmi-msm.c | 154 +++++++++++++++++++++++++++-------------
 2 files changed, 105 insertions(+), 50 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 52ddc99cda..6b8b0783d2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -392,6 +392,7 @@ F:	drivers/phy/msm8916-usbh-phy.c
 F:	drivers/serial/serial_msm.c
 F:	drivers/serial/serial_msm_geni.c
 F:	drivers/smem/msm_smem.c
+F:	drivers/spmi/spmi-msm.c
 F:	drivers/usb/host/ehci-msm.c
 
 ARM STI
diff --git a/drivers/spmi/spmi-msm.c b/drivers/spmi/spmi-msm.c
index 5a335e50aa..27a035c0a5 100644
--- a/drivers/spmi/spmi-msm.c
+++ b/drivers/spmi/spmi-msm.c
@@ -19,39 +19,63 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 /* PMIC Arbiter configuration registers */
-#define PMIC_ARB_VERSION		0x0000
-#define PMIC_ARB_VERSION_V2_MIN		0x20010000
-
-#define ARB_CHANNEL_OFFSET(n)		(0x4 * (n))
-#define SPMI_CH_OFFSET(chnl)		((chnl) * 0x8000)
-
-#define SPMI_REG_CMD0			0x0
-#define SPMI_REG_CONFIG			0x4
-#define SPMI_REG_STATUS			0x8
-#define SPMI_REG_WDATA			0x10
-#define SPMI_REG_RDATA			0x18
-
-#define SPMI_CMD_OPCODE_SHIFT		27
-#define SPMI_CMD_SLAVE_ID_SHIFT		20
-#define SPMI_CMD_ADDR_SHIFT		12
-#define SPMI_CMD_ADDR_OFFSET_SHIFT	4
-#define SPMI_CMD_BYTE_CNT_SHIFT		0
-
-#define SPMI_CMD_EXT_REG_WRITE_LONG	0x00
-#define SPMI_CMD_EXT_REG_READ_LONG	0x01
-
-#define SPMI_STATUS_DONE		0x1
+#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 APID_MAP_OFFSET_V1_V2_V3 (0x800)
+#define APID_MAP_OFFSET_V5 (0x900)
+#define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
+#define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
+#define SPMI_V5_OBS_CH_OFFSET(chnl) ((chnl) * 0x80)
+#define SPMI_V5_RW_CH_OFFSET(chnl) ((chnl) * 0x10000)
+
+#define SPMI_REG_CMD0 0x0
+#define SPMI_REG_CONFIG 0x4
+#define SPMI_REG_STATUS 0x8
+#define SPMI_REG_WDATA 0x10
+#define SPMI_REG_RDATA 0x18
+
+#define SPMI_CMD_OPCODE_SHIFT 27
+#define SPMI_CMD_SLAVE_ID_SHIFT 20
+#define SPMI_CMD_ADDR_SHIFT 12
+#define SPMI_CMD_ADDR_OFFSET_SHIFT 4
+#define SPMI_CMD_BYTE_CNT_SHIFT 0
+
+#define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
+#define SPMI_CMD_EXT_REG_READ_LONG 0x01
+
+#define SPMI_STATUS_DONE 0x1
+
+#define SPMI_MAX_CHANNELS 128
+#define SPMI_MAX_SLAVES 16
+#define SPMI_MAX_PERIPH 256
+
+enum arb_ver {
+	V1 = 1,
+	V2,
+	V3,
+	V5 = 5
+};
 
-#define SPMI_MAX_CHANNELS	128
-#define SPMI_MAX_SLAVES		16
-#define SPMI_MAX_PERIPH		256
+/*
+ * 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,
+};
 
 struct msm_spmi_priv {
-	phys_addr_t arb_chnl; /* ARB channel mapping base */
+	phys_addr_t arb_chnl;  /* ARB channel mapping base */
 	phys_addr_t spmi_core; /* SPMI core */
-	phys_addr_t spmi_obs; /* SPMI observer */
+	phys_addr_t spmi_obs;  /* SPMI observer */
 	/* SPMI channel map */
 	uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
+	/* SPMI bus arbiter version */
+	u32 arb_ver;
 };
 
 static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
@@ -59,6 +83,7 @@ static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
 {
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
 	unsigned channel;
+	unsigned int ch_offset;
 	uint32_t reg = 0;
 
 	if (usid >= SPMI_MAX_SLAVES)
@@ -69,8 +94,8 @@ static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
 	channel = priv->channel_map[usid][pid];
 
 	/* Disable IRQ mode for the current channel*/
-	writel(0x0, priv->spmi_core + SPMI_CH_OFFSET(channel) +
-	       SPMI_REG_CONFIG);
+	writel(0x0,
+	       priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
 
 	/* Write single byte */
 	writel(val, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA);
@@ -82,6 +107,11 @@ static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
 	reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
 	reg |= 1; /* byte count */
 
+	if (priv->arb_ver == V5)
+		ch_offset = SPMI_V5_RW_CH_OFFSET(channel);
+	else
+		ch_offset = SPMI_CH_OFFSET(channel);
+
 	/* Send write command */
 	writel(reg, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
 
@@ -104,6 +134,7 @@ static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
 {
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
 	unsigned channel;
+	unsigned int ch_offset;
 	uint32_t reg = 0;
 
 	if (usid >= SPMI_MAX_SLAVES)
@@ -113,8 +144,13 @@ static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
 
 	channel = priv->channel_map[usid][pid];
 
+	if (priv->arb_ver == V5)
+		ch_offset = SPMI_V5_OBS_CH_OFFSET(channel);
+	else
+		ch_offset = SPMI_CH_OFFSET(channel);
+
 	/* Disable IRQ mode for the current channel*/
-	writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
+	writel(0x0, priv->spmi_obs + ch_offset + SPMI_REG_CONFIG);
 
 	/* Prepare read command */
 	reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
@@ -124,13 +160,12 @@ static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
 	reg |= 1; /* byte count */
 
 	/* Request read */
-	writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
+	writel(reg, priv->spmi_obs + ch_offset + SPMI_REG_CMD0);
 
 	/* Wait till CMD DONE status */
 	reg = 0;
 	while (!reg) {
-		reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
-			    SPMI_REG_STATUS);
+		reg = readl(priv->spmi_obs + ch_offset + SPMI_REG_STATUS);
 	}
 
 	if (reg ^ SPMI_STATUS_DONE) {
@@ -139,8 +174,8 @@ static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
 	}
 
 	/* Read the data */
-	return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
-		     SPMI_REG_RDATA) & 0xFF;
+	return readl(priv->spmi_obs + ch_offset +
+				SPMI_REG_RDATA) & 0xFF;
 }
 
 static struct dm_spmi_ops msm_spmi_ops = {
@@ -150,31 +185,50 @@ static struct dm_spmi_ops msm_spmi_ops = {
 
 static int msm_spmi_probe(struct udevice *dev)
 {
-	struct udevice *parent = dev->parent;
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
-	int node = dev_of_offset(dev);
+	phys_addr_t config_addr;
 	u32 hw_ver;
-	bool is_v1;
+	u32 version;
 	int i;
+	int err;
+
+	config_addr = dev_read_addr_index(dev, 0);
+	priv->spmi_core = dev_read_addr_index(dev, 1);
+	priv->spmi_obs = dev_read_addr_index(dev, 2);
+
+	hw_ver = readl(config_addr + PMIC_ARB_VERSION);
+
+	if (hw_ver < PMIC_ARB_VERSION_V3_MIN) {
+		priv->arb_ver = V2;
+		version = 2;
+		priv->arb_chnl = config_addr + APID_MAP_OFFSET_V1_V2_V3;
+	} else if (hw_ver < PMIC_ARB_VERSION_V5_MIN) {
+		priv->arb_ver = V3;
+		version = 3;
+		priv->arb_chnl = config_addr + APID_MAP_OFFSET_V1_V2_V3;
+	} else {
+		priv->arb_ver = V5;
+		version = 5;
+		priv->arb_chnl = config_addr + APID_MAP_OFFSET_V5;
+
+		if (err) {
+			dev_err(dev, "could not read APID->PPID mapping table, rc= %d\n", err);
+			return -1;
+		}
+	}
 
-	priv->arb_chnl = dev_read_addr(dev);
-	priv->spmi_core = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
-			dev_of_offset(parent), node, "reg", 1, NULL, false);
-	priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
-			dev_of_offset(parent), node, "reg", 2, NULL, false);
-
-	hw_ver = readl(priv->arb_chnl + PMIC_ARB_VERSION - 0x800);
-	is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
-
-	dev_dbg(dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2), hw_ver);
+	dev_dbg(dev, "PMIC Arb Version-%d (0x%x)\n", version, hw_ver);
 
 	if (priv->arb_chnl == FDT_ADDR_T_NONE ||
 	    priv->spmi_core == FDT_ADDR_T_NONE ||
 	    priv->spmi_obs == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
+	dev_dbg(dev, "priv->arb_chnl address (%llu)\n", priv->arb_chnl);
+	dev_dbg(dev, "priv->spmi_core address (%llu)\n", priv->spmi_core);
+	dev_dbg(dev, "priv->spmi_obs address (%llu)\n", priv->spmi_obs);
 	/* Scan peripherals connected to each SPMI channel */
-	for (i = 0; i < SPMI_MAX_PERIPH ; i++) {
+	for (i = 0; i < SPMI_MAX_PERIPH; i++) {
 		uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
 		uint8_t slave_id = (periph & 0xf0000) >> 16;
 		uint8_t pid = (periph & 0xff00) >> 8;
@@ -195,5 +249,5 @@ U_BOOT_DRIVER(msm_spmi) = {
 	.of_match = msm_spmi_ids,
 	.ops = &msm_spmi_ops,
 	.probe = msm_spmi_probe,
-	.priv_auto	= sizeof(struct msm_spmi_priv),
+	.priv_auto = sizeof(struct msm_spmi_priv),
 };
-- 
2.20.1