linux-kernel - [PATCH 1/4] firmware: xilinx: Add OSPI Mux selection support

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Date:   Fri, 24 Sep 2021 15:37:08 +0530
From:   Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
To:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Pratyush Yadav <p.yadav@...com>,
        Michal Simek <michal.simek@...inx.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <git@...inx.com>,
        <saikrishna12468@...il.com>, Arnd Bergmann <arnd@...db.de>,
        Nobuhiro Iwamatsu <iwamatsu@...auri.org>,
        Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Subject: [PATCH 1/4] firmware: xilinx: Add OSPI Mux selection support

Add OSPI Mux selection API support to select the AXI interface to OSPI.

Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 17 +++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 15b138326ecc..43c3b5a9eef7 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -647,6 +647,23 @@ int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_sd_dll_reset);
 
+/**
+ * zynqmp_pm_ospi_mux_select() - OSPI Mux selection
+ *
+ * @dev_id:	Device Id of the OSPI device.
+ * @select:	OSPI Mux select value.
+ *
+ * This function select the OSPI Mux.
+ *
+ * Return:	Returns status, either success or error+reason
+ */
+int zynqmp_pm_ospi_mux_select(u32 dev_id, u32 select)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, dev_id, IOCTL_OSPI_MUX_SELECT,
+				   select, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_ospi_mux_select);
+
 /**
  * zynqmp_pm_write_ggs() - PM API for writing global general storage (ggs)
  * @index:	GGS register index
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 9d1a5c175065..6979a79f553a 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -119,6 +119,7 @@ enum pm_ioctl_id {
 	IOCTL_READ_PGGS = 15,
 	/* Set healthy bit value */
 	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
+	IOCTL_OSPI_MUX_SELECT = 21,
 };
 
 enum pm_query_id {
@@ -347,6 +348,11 @@ enum zynqmp_pm_shutdown_subtype {
 	ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM = 2,
 };
 
+enum ospi_mux_select_type {
+	PM_OSPI_MUX_SEL_DMA = 0,
+	PM_OSPI_MUX_SEL_LINEAR = 1,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID
@@ -383,6 +389,7 @@ int zynqmp_pm_set_pll_frac_data(u32 clk_id, u32 data);
 int zynqmp_pm_get_pll_frac_data(u32 clk_id, u32 *data);
 int zynqmp_pm_set_sd_tapdelay(u32 node_id, u32 type, u32 value);
 int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type);
+int zynqmp_pm_ospi_mux_select(u32 dev_id, u32 select);
 int zynqmp_pm_reset_assert(const enum zynqmp_pm_reset reset,
 			   const enum zynqmp_pm_reset_action assert_flag);
 int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset, u32 *status);
@@ -503,6 +510,11 @@ static inline int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type)
 	return -ENODEV;
 }
 
+static inline int zynqmp_pm_ospi_mux_select(u32 dev_id, u32 select)
+{
+	return -ENODEV;
+}
+
 static inline int zynqmp_pm_reset_assert(const enum zynqmp_pm_reset reset,
 					 const enum zynqmp_pm_reset_action assert_flag)
 {
-- 
2.17.1