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([2403:c300:5606:d914:fec1:9dc9:d21d:9b02]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20e7f0bd376sm69782065ad.132.2024.10.24.03.16.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 03:16:55 -0700 (PDT) From: Tony Chung To: gregkh@linuxfoundation.org Cc: johan@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Tony Chung Subject: [PATCH 2/3] drivers: usb: serial: mos7840: added optimized register setups for common baudrates. Date: Thu, 24 Oct 2024 18:09:03 +0800 Message-Id: <20241024100901.69883-3-tony467913@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241024100901.69883-1-tony467913@gmail.com> References: <20241024100901.69883-1-tony467913@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 added optimized register setups for common baudrates. Signed-off-by: Tony Chung --- drivers/usb/serial/mos7840.c | 114 ++++++++++++++++++++++++++++++++++- 1 file changed, 111 insertions(+), 3 deletions(-) diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index 362875a53..acc16737b 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -1063,11 +1063,116 @@ static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port, { dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate); - if (baudRate <= 115200) { + // divisor = (256*DLM)+DLL + // baudrate = InputCLK/(16*Divisor) + if (baudRate == 50) { + *divisor = (256*0x09)+0x04; // DLM=0x09, DLL=0x04 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 75) { + *divisor = (256*0x06)+0x02; // DLM=0x06, DLL=0x02 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 110) { + *divisor = (256*0x04)+0x19; // DLM=0x04, DLL=0x19 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 134) { + *divisor = (256*0x03)+0x5d; // DLM=0x03, DLL=0x5d + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 150) { + *divisor = (256*0x03)+0x01; // DLM=0x03, DLL=0x01 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 300) { + *divisor = (256*0x01)+0x81; // DLM=0x01, DLL=0x81 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 600) { + *divisor = 0xc0; // DLM=0, DLL=0xc0 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 1200) { + *divisor = 0x60; // DLM=0, DLL=0x60 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 1800) { + *divisor = 0x40; // DLM=0, DLL=0x40 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 2400) { + *divisor = 0x30; // DLM=0, DLL=0x30 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 4800) { + *divisor = 0x18; // DLM=0, DLL=0x18 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 7200) { + *divisor = 0x10; // DLM=0, DLL=0x10 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 9600) { + *divisor = 0x0c; // DLM=0, DLL=0x0c + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 14400) { + *divisor = 0x08; // DLM=0, DLL=0x08 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 19200) { + *divisor = 0x06; // DLM=0, DLL=0x06 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 28800) { + *divisor = 0x04; // DLM=0, DLL=0x04 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 38400) { + *divisor = 0x03; // DLM=0, DLL=0x03 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 57600) { + *divisor = 0x02; // DLM=0, DLL=0x02 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 115200) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x0; // clock source = 1.846153846M + } else if (baudRate == 230400) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x10; // clock source = 3.692307692M + } else if (baudRate == 460800) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x30; // clock source = 7.384615384M + } else if (baudRate == 806400) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x40; // clock source = 12.923076922M + } else if (baudRate == 921600) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x50; // clock source = 14.769230768M + } else if (baudRate == 25000) { + *divisor = 0x78; // DLM=0, DLL=0x78 + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 50000) { + *divisor = 0x3c; // DLM=0, DLL=0x3c + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 75000) { + *divisor = 0x28; // DLM=0, DLL=0x28 + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 100000) { + *divisor = 0x1e; // DLM=0, DLL=0x1e + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 250000) { + *divisor = 0x0c; // DLM=0, DLL=0x0c + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 300000) { + *divisor = 0x0a; // DLM=0, DLL=0x0a + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 500000) { + *divisor = 0x06; // DLM=0, DLL=0x06 + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 600000) { + *divisor = 0x05; // DLM=0, DLL=0x05 + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 1000000) { + *divisor = 0x03; // DLM=0, DLL=0x03 + *clk_sel_val = 0x70; // clock source=48M + } else if (baudRate == 3000000) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x70; // clock source=48M + + } else if (baudRate == 1500000) { + *divisor = 0x01; // DLM=0, DLL=0x01 + *clk_sel_val = 0x60; // clock source=24M + + } else if (baudRate <= 115200) { *divisor = 115200 / baudRate; *clk_sel_val = 0x0; - } - if ((baudRate > 115200) && (baudRate <= 230400)) { + } else if ((baudRate > 115200) && (baudRate <= 230400)) { *divisor = 230400 / baudRate; *clk_sel_val = 0x10; } else if ((baudRate > 230400) && (baudRate <= 403200)) { @@ -1088,6 +1193,9 @@ static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port, } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { *divisor = 3145728 / baudRate; *clk_sel_val = 0x70; + } else { + dev_dbg(&port->dev, "func: %s -baudrate %d not supported.\n", __func__, baudRate); + return -1; } return 0; }