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Sun, 22 Jun 2025 05:21:21 -0400 From: Jorge Marques Date: Sun, 22 Jun 2025 11:18:58 +0200 Subject: [PATCH v2 1/3] i3c: master: Add inline i3c_readl_fifo() and i3c_writel_fifo() MIME-Version: 1.0 Message-ID: <20250622-i3c-writesl-readsl-v2-1-2afd34ec6306@analog.com> References: <20250622-i3c-writesl-readsl-v2-0-2afd34ec6306@analog.com> In-Reply-To: <20250622-i3c-writesl-readsl-v2-0-2afd34ec6306@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=1750583937; l=1919; i=jorge.marques@analog.com; s=20250303; h=from:subject:message-id; bh=Dva/GbAbWuDLMMK+tDe/4bHG1TBRDryfMCpLVW9ikz0=; b=Zu7VYTthOqrCyBGQSr6n7eFUw1aIAaTBS+zk7LcsICJ/94C/Kmd2aBuZbto2yLXWxRhr/IXn1 NV+x92LgwP/B4Fnuz8Bq8l9nWehnQiHSZoFckMHNpfwJiSyvTPB/VPs X-Developer-Key: i=jorge.marques@analog.com; a=ed25519; pk=NUR1IZZMH0Da3QbJ2tBSznSPVfRpuoWdhBzKGSpAdbg= X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=HZYUTjE8 c=1 sm=1 tr=0 ts=6857cb1e cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=gAnH3GRIAAAA:8 a=QMVJh2PuZ69kPaAn0y8A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: gSUpFxPmM7AQcT5HLhgxOrUAXQFYQg7I X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjIyMDA1NSBTYWx0ZWRfXyrKTB3LrpQHA tsCTERBYcOmqqzrOBtSyROZdnTO4EDWiVlotdLH4sG8g8e0XihVcK4L0rRInMlIDV/B6dHIKZy6 iygj47hp/3brmm86HFGOZZ3EzFOahl3mxDCzjYvVQDo/3RE30nDZLSWCbQ1ryoC2S4ZerR+sd0C VNSHMLvfSj63HDTe4Mj4wk0lIbBoPjjKiKt7h2uy296RHSqW82tiQqpILwdEGqSmSFg5Nj3FygA r/KhK6/nzo8BQ3pEv9nh9L0vScAllSvZvAV4a/Ipmr/+Woo9UQfrpctmdwRzKK+g5G060cSiOIe bzuy6sI3E6//o0uKV7uxWt4lNgOtx3kR4vQDf4485ayrdNpXHB4FAPmvT9OrI4T680OyTnsi/vN gGuhNDfZ413aNFJ41BwWp6JBP6++HpdGMjaXqTRQo5aJAqTcDUX0djRbOjyXZTd35IJhou+Q X-Proofpoint-ORIG-GUID: gSUpFxPmM7AQcT5HLhgxOrUAXQFYQg7I X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-22_03,2025-06-20_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=741 bulkscore=0 malwarescore=0 spamscore=0 priorityscore=1501 mlxscore=0 impostorscore=0 adultscore=0 clxscore=1015 suspectscore=0 phishscore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506220055 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250622_022138_811897_B1D6F425 X-CRM114-Status: GOOD ( 14.20 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org The i3c abstraction excepts u8 buffers, but some controllers have a bus width of 32-bits and don't support flagging valid bytes, so it is required to read/write long words and to use memcpy on the remainder of the number of bytes by 32-bits to not write/read outside the buffer bounds. Signed-off-by: Jorge Marques --- drivers/i3c/internals.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h index 433f6088b7cec8c77288ee24dbee8b18338aa1eb..88887b12122efafac81bcfdd093d943259e13a08 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_master_writesl- Write bytes to long memory region from byte array + * @addr: Register to write to + * @bytes: Pointer to the data bytes to write + * @nbytes: Number of bytes to write + */ +static inline void i3c_writel_fifo(void __iomem *addr, const void *bytes, + int nbytes) +{ + writesl(addr, bytes, nbytes / 4); + if (nbytes & 3) { + u32 tmp = 0; + + memcpy(&tmp, bytes + (nbytes & ~3), nbytes & 3); + writel(tmp, addr); + } +} + +/** + * i3c_master_readsl - Read bytes from long memory region to byte array + * @addr: Register to read from + * @bytes: 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 *bytes, + int nbytes) +{ + readsl(addr, bytes, nbytes / 4); + if (nbytes & 3) { + u32 tmp; + + tmp = readl(addr); + memcpy(bytes + (nbytes & ~3), &tmp, nbytes & 3); + } +} + #endif /* I3C_INTERNAL_H */ -- 2.49.0 -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c