Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.62.198 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.62.198; helo=xsj-pvapexch01.xlnx.xilinx.com;
Envelope-to: git@xilinx.com,
 arnd@arndb.de,
 zou_wei@huawei.com,
 gregkh@linuxfoundation.org,
 linus.walleij@linaro.org,
 iwamatsu@nigauri.org,
 bgolaszewski@baylibre.com,
 robh+dt@kernel.org,
 linux-gpio@vger.kernel.org,
 devicetree@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org,
 linux-kernel@vger.kernel.org
From:   Piyush Mehta <piyush.mehta@xilinx.com>
To:     <arnd@arndb.de>, <zou_wei@huawei.com>,
        <gregkh@linuxfoundation.org>, <linus.walleij@linaro.org>,
        <michal.simek@xilinx.com>, <wendy.liang@xilinx.com>,
        <iwamatsu@nigauri.org>, <bgolaszewski@baylibre.com>,
        <robh+dt@kernel.org>, <rajan.vaja@xilinx.com>
CC:     <linux-gpio@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <git@xilinx.com>, <sgoud@xilinx.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Piyush Mehta <piyush.mehta@xilinx.com>
Subject: [PATCH V4 1/3] firmware: zynqmp: Add MMIO read and write support for PS_MODE pin
Date:   Wed, 22 Sep 2021 19:23:17 +0530
Message-ID: <20210922135319.3128153-2-piyush.mehta@xilinx.com>
In-Reply-To: <20210922135319.3128153-1-piyush.mehta@xilinx.com>
References: <20210922135319.3128153-1-piyush.mehta@xilinx.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Sep 2021 13:54:25.1852
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 02cc5326-a7c5-46bc-f01c-08d97dd07cfd
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com]
X-MS-Exchange-CrossTenant-AuthSource: BN1NAM02FT042.eop-nam02.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR02MB7867
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Add Xilinx ZynqMP firmware MMIO APIs support to set and get PS_MODE
pins value and status. These APIs create an interface path between
mode pin controller driver and low-level API to access GPIO pins.

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
---
Changes in v2:
- Added Xilinx ZynqMP firmware MMIO API support to set and get pin
  value and status.
---
 drivers/firmware/xilinx/zynqmp.c     | 46 ++++++++++++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 14 +++++++++++
 2 files changed, 60 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index a3cadba..7feba12 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -28,6 +28,13 @@
 /* Max HashMap Order for PM API feature check (1<<7 = 128) */
 #define PM_API_FEATURE_CHECK_MAX_ORDER  7
 
+/* CRL registers and bitfields */
+#define CRL_APB_BASE			0xFF5E0000U
+/* BOOT_PIN_CTRL- Used to control the mode pins after boot */
+#define CRL_APB_BOOT_PIN_CTRL		(CRL_APB_BASE + (0x250U))
+/* BOOT_PIN_CTRL_MASK- out_val[11:8], out_en[3:0] */
+#define CRL_APB_BOOTPIN_CTRL_MASK	0xF0FU
+
 static bool feature_check_enabled;
 static DEFINE_HASHTABLE(pm_api_features_map, PM_API_FEATURE_CHECK_MAX_ORDER);
 
@@ -926,6 +933,45 @@ int zynqmp_pm_pinctrl_set_config(const u32 pin, const u32 param,
 EXPORT_SYMBOL_GPL(zynqmp_pm_pinctrl_set_config);
 
 /**
+ * zynqmp_pm_bootmode_read() - PM Config API for read bootpin status
+ * @ps_mode: Returned output value of ps_mode
+ *
+ * This API function is to be used for notify the power management controller
+ * to read bootpin status.
+ *
+ * Return: status, either success or error+reason
+ */
+unsigned int zynqmp_pm_bootmode_read(u32 *ps_mode)
+{
+	unsigned int ret;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+
+	ret = zynqmp_pm_invoke_fn(PM_MMIO_READ, CRL_APB_BOOT_PIN_CTRL, 0,
+				  0, 0, ret_payload);
+
+	*ps_mode = ret_payload[1];
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_bootmode_read);
+
+/**
+ * zynqmp_pm_bootmode_write() - PM Config API for Configure bootpin
+ * @ps_mode: Value to be written to the bootpin ctrl register
+ *
+ * This API function is to be used for notify the power management controller
+ * to configure bootpin.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+int zynqmp_pm_bootmode_write(u32 ps_mode)
+{
+	return zynqmp_pm_invoke_fn(PM_MMIO_WRITE, CRL_APB_BOOT_PIN_CTRL,
+				   CRL_APB_BOOTPIN_CTRL_MASK, ps_mode, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_bootmode_write);
+
+/**
  * zynqmp_pm_init_finalize() - PM call to inform firmware that the caller
  *			       master has initialized its own power management
  *
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 56b426f..3917f89 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -72,6 +72,8 @@ enum pm_api_id {
 	PM_SET_REQUIREMENT = 15,
 	PM_RESET_ASSERT = 17,
 	PM_RESET_GET_STATUS = 18,
+	PM_MMIO_WRITE = 19,
+	PM_MMIO_READ = 20,
 	PM_PM_INIT_FINALIZE = 21,
 	PM_FPGA_LOAD = 22,
 	PM_FPGA_GET_STATUS = 23,
@@ -390,6 +392,8 @@ int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type);
 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);
+unsigned int zynqmp_pm_bootmode_read(u32 *ps_mode);
+int zynqmp_pm_bootmode_write(u32 ps_mode);
 int zynqmp_pm_init_finalize(void);
 int zynqmp_pm_set_suspend_mode(u32 mode);
 int zynqmp_pm_request_node(const u32 node, const u32 capabilities,
@@ -520,6 +524,16 @@ static inline int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset,
 	return -ENODEV;
 }
 
+static inline unsigned int zynqmp_pm_bootmode_read(u32 *ps_mode)
+{
+	return -ENODEV;
+}
+
+static inline int zynqmp_pm_bootmode_write(u32 ps_mode)
+{
+	return -ENODEV;
+}
+
 static inline int zynqmp_pm_init_finalize(void)
 {
 	return -ENODEV;
-- 
2.7.4