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From:   Markus Mayer <mmayer@broadcom.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Florian Fainelli <florian.fainelli@broadcom.com>,
        Rob Herring <robh+dt@kernel.org>,
        Conor Dooley <conor+dt@kernel.org>
Cc:     Markus Mayer <mmayer@broadcom.com>,
        Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
        Device Tree Mailing List <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [PATCH 3/4] memory: brcmstb_dpfe: support DPFE API v4
Date:   Tue,  5 Dec 2023 10:47:36 -0800
Message-ID: <20231205184741.3092376-4-mmayer@broadcom.com>
In-Reply-To: <20231205184741.3092376-1-mmayer@broadcom.com>
References: <20231205184741.3092376-1-mmayer@broadcom.com>
MIME-Version: 1.0
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Add support for version 4 of the DPFE API. This new version is largely
identical to version 3. The main difference is that all commands now
take the MHS version number as the first argument. Any other arguments
have been pushed down by one (i.e. what used to be arg0 in v3 is arg1 in
v4).

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
---
 drivers/memory/brcmstb_dpfe.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/brcmstb_dpfe.c b/drivers/memory/brcmstb_dpfe.c
index 66876b409e59..0b0a9b85b605 100644
--- a/drivers/memory/brcmstb_dpfe.c
+++ b/drivers/memory/brcmstb_dpfe.c
@@ -37,6 +37,9 @@
 
 #define DRVNAME			"brcmstb-dpfe"
 
+/* Generic constants */
+#define MHS_VERSION		0x04000000
+
 /* DCPU register offsets */
 #define REG_DCPU_RESET		0x0
 #define REG_TO_DCPU_MBOX	0x10
@@ -301,6 +304,28 @@ static const struct dpfe_api dpfe_api_v3 = {
 	},
 };
 
+/* API v4 firmware commands */
+static struct dpfe_api dpfe_api_v4 = {
+	.version = 4,
+	.fw_name = NULL, /* We expect the firmware to have been downloaded! */
+	.sysfs_attrs = dpfe_v3_groups, /* Same as v3 */
+	.command = {
+		[DPFE_CMD_GET_INFO] = {
+			[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
+			[MSG_COMMAND] = 0x0101,
+			[MSG_ARG_COUNT] = 2,
+			[MSG_ARG0] = MHS_VERSION,
+			[MSG_ARG0 + 1] = 1, /* Now the 2nd argument */
+		},
+		[DPFE_CMD_GET_REFRESH] = {
+			[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
+			[MSG_COMMAND] = 0x0202,
+			[MSG_ARG_COUNT] = 1,
+			[MSG_ARG0] = MHS_VERSION,
+		},
+	},
+};
+
 static const char *get_error_text(unsigned int i)
 {
 	static const char * const error_text[] = {
@@ -929,8 +954,12 @@ static const struct of_device_id brcmstb_dpfe_of_match[] = {
 	{ .compatible = "brcm,dpfe-cpu-v1", .data = &dpfe_api_old_v2 },
 	{ .compatible = "brcm,dpfe-cpu-v2", .data = &dpfe_api_new_v2 },
 	{ .compatible = "brcm,dpfe-cpu-v3", .data = &dpfe_api_v3 },
+	{ .compatible = "brcm,dpfe-cpu-v4", .data = &dpfe_api_v4 },
 
-	/* API v3 is the default going forward */
+	/*
+	 * For historical reasons, API v3 is the default if nothing else is
+	 * specified.
+	 */
 	{ .compatible = "brcm,dpfe-cpu", .data = &dpfe_api_v3 },
 	{}
 };
-- 
2.43.0