--- /dev/null
+From ef54f033c53bf4518f6e16e7ed815acd855e03c5 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 10 Aug 2016 11:51:16 +0200
+Subject: [PATCH] USB: bcma: support old USB 2.0 controller on Northstar
+ devices
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Currently bcma-hcd driver handles 3 different bcma cores:
+1) BCMA_CORE_USB20_HOST (0x819)
+2) BCMA_CORE_NS_USB20 (0x504)
+3) BCMA_CORE_NS_USB30 (0x505)
+
+The first one was introduced years ago and so far was used on MIPS
+devices only. All Northstar (ARM) devices were using other two cores
+which allowed easy implementation of separated initialization paths.
+
+It seems however Broadcom decided to reuse this old USB 2.0 controller
+on some recently introduced cheaper Northstar BCM53573 SoCs. I noticed
+this on Tenda AC9 (based on BCM47189B0 belonging to BCM53573 family).
+
+There is no difference in this old controller core identification
+between MIPS and ARM devices: they share the same id and revision. We
+need different controller initialization procedure however.
+To handle this add a check for architecture and implement required
+initialization for ARM case.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ drivers/usb/host/bcma-hcd.c | 86 ++++++++++++++++++++++++++++++++++++++++--
+ include/linux/bcma/bcma_regs.h | 1 +
+ 2 files changed, 83 insertions(+), 4 deletions(-)
+
+--- a/drivers/usb/host/bcma-hcd.c
++++ b/drivers/usb/host/bcma-hcd.c
+@@ -35,6 +35,9 @@ MODULE_AUTHOR("Hauke Mehrtens");
+ MODULE_DESCRIPTION("Common USB driver for BCMA Bus");
+ MODULE_LICENSE("GPL");
+
++/* See BCMA_CLKCTLST_EXTRESREQ and BCMA_CLKCTLST_EXTRESST */
++#define USB_BCMA_CLKCTLST_USB_CLK_REQ 0x00000100
++
+ struct bcma_hcd_device {
+ struct bcma_device *core;
+ struct platform_device *ehci_dev;
+@@ -166,6 +169,76 @@ static void bcma_hcd_init_chip_mips(stru
+ }
+ }
+
++/**
++ * bcma_hcd_usb20_old_arm_init - Initialize old USB 2.0 controller on ARM
++ *
++ * Old USB 2.0 core is identified as BCMA_CORE_USB20_HOST and was introduced
++ * long before Northstar devices. It seems some cheaper chipsets like BCM53573
++ * still use it.
++ * Initialization of this old core differs between MIPS and ARM.
++ */
++static int bcma_hcd_usb20_old_arm_init(struct bcma_hcd_device *usb_dev)
++{
++ struct bcma_device *core = usb_dev->core;
++ struct device *dev = &core->dev;
++ struct bcma_device *pmu_core;
++
++ usleep_range(10000, 20000);
++ if (core->id.rev < 5)
++ return 0;
++
++ pmu_core = bcma_find_core(core->bus, BCMA_CORE_PMU);
++ if (!pmu_core) {
++ dev_err(dev, "Could not find PMU core\n");
++ return -ENOENT;
++ }
++
++ /* Take USB core out of reset */
++ bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK | BCMA_IOCTL_FGC);
++ usleep_range(100, 200);
++ bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
++ usleep_range(100, 200);
++ bcma_awrite32(core, BCMA_RESET_CTL, 0);
++ usleep_range(100, 200);
++ bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK);
++ usleep_range(100, 200);
++
++ /* Enable Misc PLL */
++ bcma_write32(core, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT |
++ BCMA_CLKCTLST_HQCLKREQ |
++ USB_BCMA_CLKCTLST_USB_CLK_REQ);
++ usleep_range(100, 200);
++
++ bcma_write32(core, 0x510, 0xc7f85000);
++ bcma_write32(core, 0x510, 0xc7f85003);
++ usleep_range(300, 600);
++
++ /* Program USB PHY PLL parameters */
++ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x6);
++ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x005360c1);
++ usleep_range(100, 200);
++ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x7);
++ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x0);
++ usleep_range(100, 200);
++ bcma_set32(pmu_core, BCMA_CC_PMU_CTL, BCMA_CC_PMU_CTL_PLL_UPD);
++ usleep_range(100, 200);
++
++ bcma_write32(core, 0x510, 0x7f8d007);
++ udelay(1000);
++
++ /* Take controller out of reset */
++ bcma_write32(core, 0x200, 0x4ff);
++ usleep_range(25, 50);
++ bcma_write32(core, 0x200, 0x6ff);
++ usleep_range(25, 50);
++ bcma_write32(core, 0x200, 0x7ff);
++ usleep_range(25, 50);
++
++ of_platform_default_populate(dev->of_node, NULL, dev);
++
++ return 0;
++}
++
+ static void bcma_hcd_init_chip_arm_phy(struct bcma_device *dev)
+ {
+ struct bcma_device *arm_core;
+@@ -370,19 +443,24 @@ static int bcma_hcd_probe(struct bcma_de
+
+ switch (core->id.id) {
+ case BCMA_CORE_USB20_HOST:
++ if (IS_ENABLED(CONFIG_ARM))
++ err = bcma_hcd_usb20_old_arm_init(usb_dev);
++ else if (IS_ENABLED(CONFIG_MIPS))
++ err = bcma_hcd_usb20_init(usb_dev);
++ else
++ err = -ENOTSUPP;
++ break;
+ case BCMA_CORE_NS_USB20:
+ err = bcma_hcd_usb20_init(usb_dev);
+- if (err)
+- return err;
+ break;
+ case BCMA_CORE_NS_USB30:
+ err = bcma_hcd_usb30_init(usb_dev);
+- if (err)
+- return err;
+ break;
+ default:
+ return -ENODEV;
+ }
++ if (err)
++ return err;
+
+ bcma_set_drvdata(core, usb_dev);
+ return 0;
+--- a/include/linux/bcma/bcma_regs.h
++++ b/include/linux/bcma/bcma_regs.h
+@@ -10,6 +10,7 @@
+ #define BCMA_CLKCTLST_HAVEALPREQ 0x00000008 /* ALP available request */
+ #define BCMA_CLKCTLST_HAVEHTREQ 0x00000010 /* HT available request */
+ #define BCMA_CLKCTLST_HWCROFF 0x00000020 /* Force HW clock request off */
++#define BCMA_CLKCTLST_HQCLKREQ 0x00000040 /* HQ Clock */
+ #define BCMA_CLKCTLST_EXTRESREQ 0x00000700 /* Mask of external resource requests */
+ #define BCMA_CLKCTLST_EXTRESREQ_SHIFT 8
+ #define BCMA_CLKCTLST_HAVEALP 0x00010000 /* ALP available */
MODULE_AUTHOR("Hauke Mehrtens");
MODULE_DESCRIPTION("Common USB driver for BCMA Bus");
-@@ -39,6 +40,7 @@ struct bcma_hcd_device {
+@@ -42,6 +43,7 @@ struct bcma_hcd_device {
struct bcma_device *core;
struct platform_device *ehci_dev;
struct platform_device *ohci_dev;
struct gpio_desc *gpio_desc;
};
-@@ -246,6 +248,10 @@ static const struct usb_ehci_pdata ehci_
+@@ -319,6 +321,10 @@ static const struct usb_ehci_pdata ehci_
static const struct usb_ohci_pdata ohci_pdata = {
};
static struct platform_device *bcma_hcd_create_pdev(struct bcma_device *dev,
const char *name, u32 addr,
const void *data,
-@@ -339,6 +345,150 @@ err_unregister_ohci_dev:
+@@ -412,6 +418,150 @@ err_unregister_ohci_dev:
return err;
}
static int bcma_hcd_usb30_init(struct bcma_hcd_device *bcma_hcd)
{
struct bcma_device *core = bcma_hcd->core;
-@@ -346,6 +496,14 @@ static int bcma_hcd_usb30_init(struct bc
+@@ -419,6 +569,14 @@ static int bcma_hcd_usb30_init(struct bc
bcma_core_enable(core, 0);
of_platform_default_populate(dev->of_node, NULL, dev);
return 0;
-@@ -393,11 +551,14 @@ static void bcma_hcd_remove(struct bcma_
+@@ -471,11 +629,14 @@ static void bcma_hcd_remove(struct bcma_
struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
struct platform_device *ohci_dev = usb_dev->ohci_dev;
struct platform_device *ehci_dev = usb_dev->ehci_dev;
projects / openwrt / staging / lynxis / omap.git / commitdiff