From: Tony Chung <tony467913@gmail.com>
To: gregkh@linuxfoundation.org
Cc: johan@kernel.org, linux-kernel@vger.kernel.org,
linux-usb@vger.kernel.org, Tony Chung <tony467913@gmail.com>
Subject: [PATCH 2/3] drivers: usb: serial: mos7840: added optimized register setups for common baudrates.
Date: Thu, 24 Oct 2024 18:09:03 +0800 [thread overview]
Message-ID: <20241024100901.69883-3-tony467913@gmail.com> (raw)
In-Reply-To: <20241024100901.69883-1-tony467913@gmail.com>
added optimized register setups for common baudrates.
Signed-off-by: Tony Chung <tony467913@gmail.com>
---
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;
}
--
2.34.1
next prev parent reply other threads:[~2024-10-24 10:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-24 10:08 [PATCH 0/3] drivers: usb: serial: mos7840: Improved baud rate support Tony Chung
2024-10-24 10:09 ` [PATCH 1/3] drivers: usb: serial: mos7840: Add defines for clock select register offset Tony Chung
2025-02-11 9:44 ` Johan Hovold
2024-10-24 10:09 ` Tony Chung [this message]
2025-02-11 10:16 ` [PATCH 2/3] drivers: usb: serial: mos7840: added optimized register setups for common baudrates Johan Hovold
2024-10-24 10:09 ` [PATCH 3/3] driver: usb: serial: mos7840: add more baudrate options Tony Chung
2025-02-11 13:08 ` Johan Hovold
2025-02-11 9:41 ` [PATCH 0/3] drivers: usb: serial: mos7840: Improved baud rate support Johan Hovold
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