usb: ehci: Get rid of CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS

EHC reports supported maximum number of ports in the HCSPARAMS
register, so it's unnecessary to use a hardcoded config option
CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>

drivers/usb/host/ehci-hcd.c

@@ -148,9 +148,12 @@ static void ehci_powerup_fixup(struct ehci_ctrl *ctrl, uint32_t *status_reg,
 
 static uint32_t *ehci_get_portsc_register(struct ehci_ctrl *ctrl, int port)
 {
-	if (port < 0 || port >= CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
+	int max_ports = HCS_N_PORTS(ehci_readl(&ctrl->hccr->cr_hcsparams));
+
+	if (port < 0 || port >= max_ports) {
 		/* Printing the message would cause a scan failure! */
-		debug("The request port(%u) is not configured\n", port);
+		debug("The request port(%u) exceeds maximum port number\n",
+		      port);
 		return NULL;
 	}
 
@@ -205,6 +208,7 @@ static int ehci_shutdown(struct ehci_ctrl *ctrl)
 {
 	int i, ret = 0;
 	uint32_t cmd, reg;
+	int max_ports = HCS_N_PORTS(ehci_readl(&ctrl->hccr->cr_hcsparams));
 
 	if (!ctrl || !ctrl->hcor)
 		return -EINVAL;
@@ -219,7 +223,7 @@ static int ehci_shutdown(struct ehci_ctrl *ctrl)
 		100 * 1000);
 
 	if (!ret) {
-		for (i = 0; i < CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS; i++) {
+		for (i = 0; i < max_ports; i++) {
 			reg = ehci_readl(&ctrl->hcor->or_portsc[i]);
 			reg |= EHCI_PS_SUSP;
 			ehci_writel(&ctrl->hcor->or_portsc[i], reg);

drivers/usb/host/ehci.h

@@ -11,9 +11,8 @@
 
 #include <usb.h>
 
-#if !defined(CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS)
-#define CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS	2
-#endif
+/* Section 2.2.3 - N_PORTS */
+#define MAX_HC_PORTS		15
 
 /*
  * Register Space.
@@ -62,7 +61,7 @@ struct ehci_hcor {
 	uint32_t _reserved_1_[6];
 	uint32_t or_configflag;
 #define FLAG_CF		(1 << 0)	/* true:  we'll support "high speed" */
-	uint32_t or_portsc[CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS];
+	uint32_t or_portsc[MAX_HC_PORTS];
 #define PORTSC_PSPD(x)		(((x) >> 26) & 0x3)
 #define PORTSC_PSPD_FS			0x0
 #define PORTSC_PSPD_LS			0x1