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usb: chipidea: add ahb burst configuration interface

Browse source 
The users can change it through dts or platform data if they
want to change the default value.

Signed-off-by: Peter Chen <[email protected]>
This commit is contained in:
Peter Chen 2015-03-17 14:21:00 +08:00
commit 65668718f2
3 changed files with 19 additions and 0 deletions
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3
drivers/usb/chipidea/bits.h
View file

@ -25,6 +25,9 @@
#define VERSION (0xF << 25)
#define CIVERSION (0x7 << 29)
/* SBUSCFG */
#define AHBBRST_MASK 0x7
/* HCCPARAMS */
#define HCCPARAMS_LEN BIT(17)

14
drivers/usb/chipidea/core.c
View file

@ -438,6 +438,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
ci->platdata->ahb_burst_config);
}
/**
@ -633,6 +636,17 @@ static int ci_get_platdata(struct device *dev,
}
}
if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
&platdata->ahb_burst_config);
if (ret) {
dev_err(dev,
"failed to get ahb-burst-config\n");
return ret;
}
platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
}
return 0;
}