linux-kernel - [RFC PATCH 16/21] DO_NOT_MERGE soc: add Foobar SoC cache controller driver

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Date:   Wed, 19 Apr 2023 04:11:06 -0700
From:   Drew Fustini <dfustini@...libre.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Ved Shanbhogue <ved@...osinc.com>,
        Kornel Dulęba <mindal@...ihalf.com>,
        Adrien Ricciardi <aricciardi@...libre.com>,
        Nicolas Pitre <npitre@...libre.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Babu Moger <babu.moger@....com>,
        Peter Newman <peternewman@...gle.com>, x86@...nel.org,
        Rob Herring <robh+dt@...nel.org>,
        James Morse <james.morse@....com>
Cc:     Drew Fustini <dfustini@...libre.com>
Subject: [RFC PATCH 16/21] DO_NOT_MERGE soc: add Foobar SoC cache controller driver

Add example driver for a cache controller that implements CBQRI.

Co-developed-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Drew Fustini <dfustini@...libre.com>
---
 drivers/soc/foobar/foobar_cbqri_cache.c | 110 ++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 drivers/soc/foobar/foobar_cbqri_cache.c

diff --git a/drivers/soc/foobar/foobar_cbqri_cache.c b/drivers/soc/foobar/foobar_cbqri_cache.c
new file mode 100644
index 000000000000..e880488243d8
--- /dev/null
+++ b/drivers/soc/foobar/foobar_cbqri_cache.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Foobar Systems CBQRI cache controller
+ */
+
+#define pr_fmt(fmt) "foobar-cache: " fmt
+
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/riscv_qos.h>
+
+static const struct of_device_id foobar_cbqri_cache_ids[] = {
+	{ .compatible = "foobar,cache-controller" },
+	{ }
+};
+
+static int __init foobar_cbqri_cache_init(void)
+{
+	struct device_node *np;
+	int err;
+	u32 value;
+	struct cbqri_controller_info *ctrl_info;
+
+	for_each_matching_node(np, foobar_cbqri_cache_ids) {
+		if (!of_device_is_available(np)) {
+			of_node_put(np);
+			continue;
+		}
+
+		ctrl_info = kzalloc(sizeof(*ctrl_info), GFP_KERNEL);
+		if (!ctrl_info)
+			goto err_node_put;
+		ctrl_info->type = CBQRI_CONTROLLER_TYPE_CAPACITY;
+
+		err = of_property_read_u32_index(np, "reg", 1, &value);
+		if (err) {
+			pr_err("Failed to read reg base address (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->addr = value;
+
+		err = of_property_read_u32_index(np, "reg", 3, &value);
+		if (err) {
+			pr_err("Failed to read reg size (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->size = value;
+
+		err = of_property_read_u32(np, "cache-level", &value);
+		if (err) {
+			pr_err("Failed to read cache level (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->cache.cache_level = value;
+
+		err = of_property_read_u32(np, "cache-size", &value);
+		if (err) {
+			pr_err("Failed to read cache size (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->cache.cache_size = value;
+
+		err = of_property_read_u32(np, "riscv,cbqri-rcid", &value);
+		if (err) {
+			pr_err("Failed to read RCID count (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->rcid_count = value;
+
+		err = of_property_read_u32(np, "riscv,cbqri-mcid", &value);
+		if (err) {
+			pr_err("Failed to read MCID count (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+		ctrl_info->mcid_count = value;
+
+		/*
+		 * For CBQRI, any cpu (technically a hart in RISC-V terms)
+		 * can access the memory-mapped registers of any CBQRI
+		 * controller in the system. Therefore, set the CPU mask
+		 * to 'FF' to allow all 8 cores in the example Foobar SoC
+		 */
+		err = cpumask_parse("FF", &ctrl_info->cache.cpu_mask);
+		if (err) {
+			pr_err("Failed to convert cores mask string to cpumask (%d)", err);
+			goto err_kfree_ctrl_info;
+		}
+
+		of_node_put(np);
+
+		pr_debug("addr=0x%lx max-rcid=%u max-mcid=%u level=%d size=%u",
+			 ctrl_info->addr, ctrl_info->rcid_count, ctrl_info->mcid_count,
+			 ctrl_info->cache.cache_level, ctrl_info->cache.cache_size);
+
+		/* Fill the list shared with RISC-V QoS resctrl */
+		INIT_LIST_HEAD(&ctrl_info->list);
+		list_add_tail(&ctrl_info->list, &cbqri_controllers);
+	}
+
+	return 0;
+
+err_kfree_ctrl_info:
+	kfree(ctrl_info);
+
+err_node_put:
+	of_node_put(np);
+
+	return err;
+}
+device_initcall(foobar_cbqri_cache_init);
-- 
2.34.1