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Tue, 24 Jun 2025 05:07:10 -0400 From: Jorge Marques Date: Tue, 24 Jun 2025 11:06:04 +0200 Subject: [PATCH v3 1/3] i3c: master: Add inline i3c_readl_fifo() and i3c_writel_fifo() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20250624-i3c-writesl-readsl-v3-1-63ccf0870f01@analog.com> References: <20250624-i3c-writesl-readsl-v3-0-63ccf0870f01@analog.com> In-Reply-To: <20250624-i3c-writesl-readsl-v3-0-63ccf0870f01@analog.com> To: Alexandre Belloni , Frank Li , =?utf-8?q?Przemys=C5=82aw_Gaj?= CC: , , "Jorge Marques" X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1750756023; l=1856; i=jorge.marques@analog.com; s=20250303; h=from:subject:message-id; bh=HfDaL1+3ZZH7qU0UrdVmwCMTo/BAN5wJ95E8N0SQOVA=; b=MX2OdZVXP3WUYbaV5W5gev/9zEQjAMYLZ3UF5hGa4mUxtsD3MgrB503Q0kAKF5tRTYfH7ewjJ TA6L7J9BPt4DXftOK6eKiG6WqLplJn6XW0SXH5EoCYmvRXjljxwt5Tx X-Developer-Key: i=jorge.marques@analog.com; 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To avoid reading or writing outside the buffer bounds, use 32-bit accesses where possible and apply memcpy for any remaining bytes Signed-off-by: Jorge Marques Reviewed-by: Frank Li Reviewed-by: Wolfram Sang Suggested-by: Wolfram Sang Tested-by: Wolfram Sang --- drivers/i3c/internals.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h index 433f6088b7cec8c77288ee24dbee8b18338aa1eb..6a11437fee47bd1d19354e983d4= a561a4356b08d 100644 --- a/drivers/i3c/internals.h +++ b/drivers/i3c/internals.h @@ -22,4 +22,41 @@ int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev); int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev, const struct i3c_ibi_setup *req); void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev); + +/** + * i3c_writel_fifo - Write data buffer to 32bit FIFO + * @addr: FIFO Address to write to + * @buf: Pointer to the data bytes to write + * @nbytes: Number of bytes to write + */ +static inline void i3c_writel_fifo(void __iomem *addr, const void *buf, + int nbytes) +{ + writesl(addr, buf, nbytes / 4); + if (nbytes & 3) { + u32 tmp =3D 0; + + memcpy(&tmp, buf + (nbytes & ~3), nbytes & 3); + writel(tmp, addr); + } +} + +/** + * i3c_readl_fifo - Read data buffer from 32bit FIFO + * @addr: FIFO Address to read from + * @buf: Pointer to the buffer to store read bytes + * @nbytes: Number of bytes to read + */ +static inline void i3c_readl_fifo(const void __iomem *addr, void *buf, + int nbytes) +{ + readsl(addr, buf, nbytes / 4); + if (nbytes & 3) { + u32 tmp; + + tmp =3D readl(addr); + memcpy(buf + (nbytes & ~3), &tmp, nbytes & 3); + } +} + #endif /* I3C_INTERNAL_H */ --=20 2.49.0