pds_core: add devcmd device interfaces

The devcmd interface is the basic connection to the device through the
PCI BAR for low level identification and command services.  This does
the early device initialization and finds the identity data, and adds
devcmd routines to be used by later driver bits.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/pds_core/Makefile

@@ -3,6 +3,8 @@
 
 obj-$(CONFIG_PDS_CORE) := pds_core.o
 
-pds_core-y := main.o
+pds_core-y := main.o \
+	      dev.o \
+	      core.o
 
 pds_core-$(CONFIG_DEBUG_FS) += debugfs.o

drivers/net/ethernet/amd/pds_core/core.c

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#include "core.h"
+
+int pdsc_setup(struct pdsc *pdsc, bool init)
+{
+	int err = 0;
+
+	if (init)
+		err = pdsc_dev_init(pdsc);
+	else
+		err = pdsc_dev_reinit(pdsc);
+	if (err)
+		return err;
+
+	clear_bit(PDSC_S_FW_DEAD, &pdsc->state);
+	return 0;
+}
+
+void pdsc_teardown(struct pdsc *pdsc, bool removing)
+{
+	pdsc_devcmd_reset(pdsc);
+
+	if (removing) {
+		kfree(pdsc->intr_info);
+		pdsc->intr_info = NULL;
+	}
+
+	if (pdsc->kern_dbpage) {
+		iounmap(pdsc->kern_dbpage);
+		pdsc->kern_dbpage = NULL;
+	}
+
+	set_bit(PDSC_S_FW_DEAD, &pdsc->state);
+}

drivers/net/ethernet/amd/pds_core/core.h

@@ -9,8 +9,13 @@
 
 #include <linux/pds/pds_common.h>
 #include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_intr.h>
 
 #define PDSC_DRV_DESCRIPTION	"AMD/Pensando Core Driver"
+#define PDSC_TEARDOWN_RECOVERY	false
+#define PDSC_TEARDOWN_REMOVING	true
+#define PDSC_SETUP_RECOVERY	false
+#define PDSC_SETUP_INIT		true
 
 struct pdsc_dev_bar {
 	void __iomem *vaddr;
@@ -19,6 +24,22 @@ struct pdsc_dev_bar {
 	int res_index;
 };
 
+struct pdsc_devinfo {
+	u8 asic_type;
+	u8 asic_rev;
+	char fw_version[PDS_CORE_DEVINFO_FWVERS_BUFLEN + 1];
+	char serial_num[PDS_CORE_DEVINFO_SERIAL_BUFLEN + 1];
+};
+
+#define PDSC_INTR_NAME_MAX_SZ		32
+
+struct pdsc_intr_info {
+	char name[PDSC_INTR_NAME_MAX_SZ];
+	unsigned int index;
+	unsigned int vector;
+	void *data;
+};
+
 /* No state flags set means we are in a steady running state */
 enum pdsc_state_flags {
 	PDSC_S_FW_DEAD,		    /* stopped, wait on startup or recovery */
@@ -38,7 +59,19 @@ struct pdsc {
 	int uid;
 
 	unsigned long state;
+	u8 fw_status;
+	u8 fw_generation;
+	unsigned long last_fw_time;
+	u32 last_hb;
+
+	struct pdsc_devinfo dev_info;
+	struct pds_core_dev_identity dev_ident;
+	unsigned int nintrs;
+	struct pdsc_intr_info *intr_info;	/* array of nintrs elements */
 
+	unsigned int devcmd_timeout;
+	struct mutex devcmd_lock;	/* lock for dev_cmd operations */
+	struct mutex config_lock;	/* lock for configuration operations */
 	struct pds_core_dev_info_regs __iomem *info_regs;
 	struct pds_core_dev_cmd_regs __iomem *cmd_regs;
 	struct pds_core_intr __iomem *intr_ctrl;
@@ -52,5 +85,22 @@ void pdsc_debugfs_create(void);
 void pdsc_debugfs_destroy(void);
 void pdsc_debugfs_add_dev(struct pdsc *pdsc);
 void pdsc_debugfs_del_dev(struct pdsc *pdsc);
+void pdsc_debugfs_add_ident(struct pdsc *pdsc);
+void pdsc_debugfs_add_irqs(struct pdsc *pdsc);
+
+int pdsc_err_to_errno(enum pds_core_status_code code);
+bool pdsc_is_fw_running(struct pdsc *pdsc);
+bool pdsc_is_fw_good(struct pdsc *pdsc);
+int pdsc_devcmd(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
+		union pds_core_dev_comp *comp, int max_seconds);
+int pdsc_devcmd_locked(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
+		       union pds_core_dev_comp *comp, int max_seconds);
+int pdsc_devcmd_init(struct pdsc *pdsc);
+int pdsc_devcmd_reset(struct pdsc *pdsc);
+int pdsc_dev_reinit(struct pdsc *pdsc);
+int pdsc_dev_init(struct pdsc *pdsc);
+
+int pdsc_setup(struct pdsc *pdsc, bool init);
+void pdsc_teardown(struct pdsc *pdsc, bool removing);
 
 #endif /* _PDSC_H_ */

drivers/net/ethernet/amd/pds_core/debugfs.c

@@ -29,3 +29,41 @@ void pdsc_debugfs_del_dev(struct pdsc *pdsc)
 	debugfs_remove_recursive(pdsc->dentry);
 	pdsc->dentry = NULL;
 }
+
+static int identity_show(struct seq_file *seq, void *v)
+{
+	struct pdsc *pdsc = seq->private;
+	struct pds_core_dev_identity *ident;
+	int vt;
+
+	ident = &pdsc->dev_ident;
+
+	seq_printf(seq, "fw_heartbeat:     0x%x\n",
+		   ioread32(&pdsc->info_regs->fw_heartbeat));
+
+	seq_printf(seq, "nlifs:            %d\n",
+		   le32_to_cpu(ident->nlifs));
+	seq_printf(seq, "nintrs:           %d\n",
+		   le32_to_cpu(ident->nintrs));
+	seq_printf(seq, "ndbpgs_per_lif:   %d\n",
+		   le32_to_cpu(ident->ndbpgs_per_lif));
+	seq_printf(seq, "intr_coal_mult:   %d\n",
+		   le32_to_cpu(ident->intr_coal_mult));
+	seq_printf(seq, "intr_coal_div:    %d\n",
+		   le32_to_cpu(ident->intr_coal_div));
+
+	seq_puts(seq, "vif_types:        ");
+	for (vt = 0; vt < PDS_DEV_TYPE_MAX; vt++)
+		seq_printf(seq, "%d ",
+			   le16_to_cpu(pdsc->dev_ident.vif_types[vt]));
+	seq_puts(seq, "\n");
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(identity);
+
+void pdsc_debugfs_add_ident(struct pdsc *pdsc)
+{
+	debugfs_create_file("identity", 0400, pdsc->dentry,
+			    pdsc, &identity_fops);
+}