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From: Christian Marangi <ansuelsmth@gmail.com>
To: Hauke Mehrtens <hauke@hauke-m.de>,
	=?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>,
	Christian Marangi <ansuelsmth@gmail.com>,
	=?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>,
	linux-mips@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	=?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
Subject: [PATCH v2 5/5] mips: bmips: enable RAC on BMIPS4350
Date: Fri,  3 May 2024 23:21:01 +0200
Message-ID: <20240503212139.5811-6-ansuelsmth@gmail.com>
In-Reply-To: <20240503212139.5811-1-ansuelsmth@gmail.com>
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From: Daniel González Cabanelas <dgcbueu@gmail.com>

The data RAC is left disabled by the bootloader in some SoCs, at least in
the core it boots from.
Enabling this feature increases the performance up to +30% depending on the
task.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[ rework code and reduce code duplication ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 arch/mips/kernel/smp-bmips.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
index a4f84667a901..0f93963c08e4 100644
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -620,6 +620,23 @@ void bmips_cpu_setup(void)
 		__raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
 		break;
 
+	case CPU_BMIPS4350:
+		u32 rac_addr = BMIPS_RAC_CONFIG_1;
+
+		if (!(read_c0_brcm_cmt_local() & (1 << 31)))
+			rac_addr = BMIPS_RAC_CONFIG;
+
+		/* Enable data RAC */
+		cfg = __raw_readl(bmips_cbr_addr + rac_addr);
+		__raw_writel(cfg | 0xf, bmips_cbr_addr + rac_addr);
+		__raw_readl(bmips_cbr_addr + rac_addr);
+
+		/* Flush stale data out of the readahead cache */
+		cfg = __raw_readl(bmips_cbr_addr + BMIPS_RAC_CONFIG);
+		__raw_writel(cfg | 0x100, bmips_cbr_addr + BMIPS_RAC_CONFIG);
+		__raw_readl(bmips_cbr_addr + BMIPS_RAC_CONFIG);
+		break;
+
 	case CPU_BMIPS4380:
 		/* CBG workaround for early BMIPS4380 CPUs */
 		switch (read_c0_prid()) {
-- 
2.43.0