linux-kernel - [PATCH v3] pch_uart: reference clock on CM-iTC

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Date:	Thu, 10 Mar 2011 15:14:00 +0200
From:	Denis Turischev <denis@...pulab.co.il>
To:	Greg KH <greg@...ah.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Subject: [PATCH v3] pch_uart: reference clock on CM-iTC

Default clock source for UARTs on Topcliff is external UART_CLK.
On CM-iTC USB_48MHz is used instead. After VCO2PLL and DIV
manipulations UARTs will receive 192 MHz.
Clock manipulations on Topcliff are controlled in pch_phub.c

v2: redone against the linux-next tree
v3: redone against linux/kernel/git/next/linux-next.git snapshot

Signed-off-by: Denis Turischev <denis@...pulab.co.il>
---
diff -Nru linux-next-20110310.orig/drivers/misc/pch_phub.c linux-next-20110310/drivers/misc/pch_phub.c
--- linux-next-20110310.orig/drivers/misc/pch_phub.c	2011-03-10 08:31:30.000000000 +0200
+++ linux-next-20110310/drivers/misc/pch_phub.c	2011-03-10 14:42:05.110978473 +0200
@@ -27,6 +27,7 @@
 #include <linux/mutex.h>
 #include <linux/if_ether.h>
 #include <linux/ctype.h>
+#include <linux/dmi.h>

 #define PHUB_STATUS 0x00		/* Status Register offset */
 #define PHUB_CONTROL 0x04		/* Control Register offset */
@@ -46,6 +47,13 @@
 #define PCH_MINOR_NOS 1
 #define CLKCFG_CAN_50MHZ 0x12000000
 #define CLKCFG_CANCLK_MASK 0xFF000000
+#define CLKCFG_UART_MASK			0xFFFFFF
+
+/* CM-iTC */
+#define CLKCFG_UART_48MHZ			(1 << 16)
+#define CLKCFG_BAUDDIV				(2 << 20)
+#define CLKCFG_PLL2VCO				(8 << 9)
+#define CLKCFG_UARTCLKSEL			(1 << 18)

 /* Macros for ML7213 */
 #define PCI_VENDOR_ID_ROHM			0x10db
@@ -618,6 +626,14 @@
 					       CLKCFG_CAN_50MHZ,
 					       CLKCFG_CANCLK_MASK);

+		/* quirk for CM-iTC board */
+		if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC"))
+			pch_phub_read_modify_write_reg(chip,
+						(unsigned int)CLKCFG_REG_OFFSET,
+						CLKCFG_UART_48MHZ | CLKCFG_BAUDDIV |
+						CLKCFG_PLL2VCO | CLKCFG_UARTCLKSEL,
+						CLKCFG_UART_MASK);
+
 		/* set the prefech value */
 		iowrite32(0x000affaa, chip->pch_phub_base_address + 0x14);
 		/* set the interrupt delay value */
diff -Nru linux-next-20110310.orig/drivers/tty/serial/pch_uart.c linux-next-20110310/drivers/tty/serial/pch_uart.c
--- linux-next-20110310.orig/drivers/tty/serial/pch_uart.c	2011-03-10 08:31:30.000000000 +0200
+++ linux-next-20110310/drivers/tty/serial/pch_uart.c	2011-03-10 14:45:46.123478166 +0200
@@ -20,6 +20,7 @@
 #include <linux/serial_core.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/dmi.h>

 #include <linux/dmaengine.h>
 #include <linux/pch_dma.h>
@@ -1403,14 +1404,18 @@
 	if (!rxbuf)
 		goto init_port_free_txbuf;

+	base_baud = 1843200; /* 1.8432MHz */
+
+	/* quirk for CM-iTC board */
+	if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC"))
+		base_baud = 192000000; /* 192.0MHz */
+
 	switch (port_type) {
 	case PORT_UNKNOWN:
 		fifosize = 256; /* EG20T/ML7213: UART0 */
-		base_baud = 1843200; /* 1.8432MHz */
 		break;
 	case PORT_8250:
 		fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
-		base_baud = 1843200; /* 1.8432MHz */
 		break;
 	default:
 		dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
--
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