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misc: pch_phub: Read prefetch value from device tree if passed

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The default prefetch value for the eg20t device is hard coded to
0x000affaa.

Add support for an alternative to be read from DT if available

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zubair Lutfullah Kakakhel 2016-08-12 12:48:52 +01:00 committed by Greg Kroah-Hartman
parent aeb83d7054
commit 549ce8f134
1 changed files with 8 additions and 1 deletions
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9
drivers/misc/pch_phub.c
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@ -28,6 +28,7 @@
#include <linux/if_ether.h> #include <linux/if_ether.h>
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/dmi.h> #include <linux/dmi.h>
#include <linux/of.h>
#define PHUB_STATUS 0x00 /* Status Register offset */ #define PHUB_STATUS 0x00 /* Status Register offset */
#define PHUB_CONTROL 0x04 /* Control Register offset */ #define PHUB_CONTROL 0x04 /* Control Register offset */
@ -711,6 +712,12 @@ static int pch_phub_probe(struct pci_dev *pdev,
if (id->driver_data == 1) { /* EG20T PCH */ if (id->driver_data == 1) { /* EG20T PCH */
const char *board_name; const char *board_name;
unsigned int prefetch = 0x000affaa;
if (pdev->dev.of_node)
of_property_read_u32(pdev->dev.of_node,
"intel,eg20t-prefetch",
&prefetch);
ret = sysfs_create_file(&pdev->dev.kobj, ret = sysfs_create_file(&pdev->dev.kobj,
&dev_attr_pch_mac.attr); &dev_attr_pch_mac.attr);
@ -736,7 +743,7 @@ static int pch_phub_probe(struct pci_dev *pdev,
CLKCFG_UART_MASK); CLKCFG_UART_MASK);
/* set the prefech value */ /* set the prefech value */
iowrite32(0x000affaa, chip->pch_phub_base_address + 0x14); iowrite32(prefetch, chip->pch_phub_base_address + 0x14);
/* set the interrupt delay value */ /* set the interrupt delay value */
iowrite32(0x25, chip->pch_phub_base_address + 0x44); iowrite32(0x25, chip->pch_phub_base_address + 0x44);
chip->pch_opt_rom_start_address = PCH_PHUB_ROM_START_ADDR_EG20T; chip->pch_opt_rom_start_address = PCH_PHUB_ROM_START_ADDR_EG20T;