Commit 6ae705b2 authored by Denis Turischev's avatar Denis Turischev Committed by Greg Kroah-Hartman
Browse files

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: default avatarDenis Turischev <denis@compulab.co.il>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1a738dcf

drivers/misc/pch_phub.c

+16 −0
Original line number Diff line number Diff line
@@ -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 @@ static int __devinit pch_phub_probe(struct pci_dev *pdev, 
					       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 */

drivers/tty/serial/pch_uart.c

+7 −2
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#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>
@@ -1404,14 +1405,18 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, 
	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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