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![Hans de Goede](/assets/img/avatar_default.png)
Once we add support for the ohci controller the phy-init and phy-power-on functions may be called twice (once by the ehci code and once by the ohci code) protect them against this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
305 lines
6.4 KiB
C
305 lines
6.4 KiB
C
/*
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* Sunxi usb-phy code
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*
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* Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
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* Copyright (C) 2014 Roman Byshko <rbyshko@gmail.com>
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*
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* Based on code from
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/usb_phy.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <errno.h>
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#ifdef CONFIG_AXP152_POWER
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#include <axp152.h>
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#endif
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#ifdef CONFIG_AXP209_POWER
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#include <axp209.h>
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#endif
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#ifdef CONFIG_AXP221_POWER
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#include <axp221.h>
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#endif
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#define SUNXI_USB_PMU_IRQ_ENABLE 0x800
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#ifdef CONFIG_MACH_SUN8I_A33
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#define SUNXI_USB_CSR 0x410
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#else
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#define SUNXI_USB_CSR 0x404
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#endif
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#define SUNXI_USB_PASSBY_EN 1
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#define SUNXI_EHCI_AHB_ICHR8_EN (1 << 10)
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#define SUNXI_EHCI_AHB_INCR4_BURST_EN (1 << 9)
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#define SUNXI_EHCI_AHB_INCRX_ALIGN_EN (1 << 8)
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#define SUNXI_EHCI_ULPI_BYPASS_EN (1 << 0)
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static struct sunxi_usb_phy {
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int usb_rst_mask;
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int gpio_vbus;
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int gpio_vbus_det;
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int id;
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int init_count;
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int power_on_count;
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} sunxi_usb_phy[] = {
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{
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.usb_rst_mask = CCM_USB_CTRL_PHY0_RST | CCM_USB_CTRL_PHY0_CLK,
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.id = 0,
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},
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{
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.usb_rst_mask = CCM_USB_CTRL_PHY1_RST | CCM_USB_CTRL_PHY1_CLK,
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.id = 1,
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},
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#if CONFIG_SUNXI_USB_PHYS >= 3
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{
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.usb_rst_mask = CCM_USB_CTRL_PHY2_RST | CCM_USB_CTRL_PHY2_CLK,
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.id = 2,
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}
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#endif
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};
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static int get_vbus_gpio(int index)
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{
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switch (index) {
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case 0: return sunxi_name_to_gpio(CONFIG_USB0_VBUS_PIN);
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case 1: return sunxi_name_to_gpio(CONFIG_USB1_VBUS_PIN);
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case 2: return sunxi_name_to_gpio(CONFIG_USB2_VBUS_PIN);
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}
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return -EINVAL;
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}
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static int get_vbus_detect_gpio(int index)
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{
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switch (index) {
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case 0: return sunxi_name_to_gpio(CONFIG_USB0_VBUS_DET);
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}
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return -EINVAL;
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}
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static void usb_phy_write(struct sunxi_usb_phy *phy, int addr,
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int data, int len)
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{
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int j = 0, usbc_bit = 0;
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void *dest = (void *)SUNXI_USB0_BASE + SUNXI_USB_CSR;
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#ifdef CONFIG_MACH_SUN8I_A33
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/* CSR needs to be explicitly initialized to 0 on A33 */
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writel(0, dest);
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#endif
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usbc_bit = 1 << (phy->id * 2);
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for (j = 0; j < len; j++) {
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/* set the bit address to be written */
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clrbits_le32(dest, 0xff << 8);
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setbits_le32(dest, (addr + j) << 8);
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clrbits_le32(dest, usbc_bit);
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/* set data bit */
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if (data & 0x1)
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setbits_le32(dest, 1 << 7);
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else
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clrbits_le32(dest, 1 << 7);
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setbits_le32(dest, usbc_bit);
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clrbits_le32(dest, usbc_bit);
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data >>= 1;
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}
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}
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static void sunxi_usb_phy_config(struct sunxi_usb_phy *phy)
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{
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/* The following comments are machine
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* translated from Chinese, you have been warned!
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*/
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/* Regulation 45 ohms */
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if (phy->id == 0)
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usb_phy_write(phy, 0x0c, 0x01, 1);
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/* adjust PHY's magnitude and rate */
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usb_phy_write(phy, 0x20, 0x14, 5);
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/* threshold adjustment disconnect */
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#if defined CONFIG_MACH_SUN4I || defined CONFIG_MACH_SUN6I
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usb_phy_write(phy, 0x2a, 3, 2);
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#else
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usb_phy_write(phy, 0x2a, 2, 2);
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#endif
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return;
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}
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static void sunxi_usb_phy_passby(int index, int enable)
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{
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unsigned long bits = 0;
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void *addr;
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if (index == 1)
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addr = (void *)SUNXI_USB1_BASE + SUNXI_USB_PMU_IRQ_ENABLE;
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else
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addr = (void *)SUNXI_USB2_BASE + SUNXI_USB_PMU_IRQ_ENABLE;
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bits = SUNXI_EHCI_AHB_ICHR8_EN |
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SUNXI_EHCI_AHB_INCR4_BURST_EN |
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SUNXI_EHCI_AHB_INCRX_ALIGN_EN |
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SUNXI_EHCI_ULPI_BYPASS_EN;
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if (enable)
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setbits_le32(addr, bits);
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else
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clrbits_le32(addr, bits);
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return;
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}
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void sunxi_usb_phy_enable_squelch_detect(int index, int enable)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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usb_phy_write(phy, 0x3c, enable ? 0 : 2, 2);
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}
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void sunxi_usb_phy_init(int index)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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phy->init_count++;
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if (phy->init_count != 1)
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return;
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setbits_le32(&ccm->usb_clk_cfg, phy->usb_rst_mask);
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sunxi_usb_phy_config(phy);
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if (phy->id != 0)
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sunxi_usb_phy_passby(index, SUNXI_USB_PASSBY_EN);
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}
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void sunxi_usb_phy_exit(int index)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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phy->init_count--;
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if (phy->init_count != 0)
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return;
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if (phy->id != 0)
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sunxi_usb_phy_passby(index, !SUNXI_USB_PASSBY_EN);
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clrbits_le32(&ccm->usb_clk_cfg, phy->usb_rst_mask);
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}
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void sunxi_usb_phy_power_on(int index)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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phy->power_on_count++;
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if (phy->power_on_count != 1)
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return;
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if (phy->gpio_vbus >= 0)
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gpio_set_value(phy->gpio_vbus, 1);
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}
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void sunxi_usb_phy_power_off(int index)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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phy->power_on_count--;
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if (phy->power_on_count != 0)
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return;
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if (phy->gpio_vbus >= 0)
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gpio_set_value(phy->gpio_vbus, 0);
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}
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int sunxi_usb_phy_vbus_detect(int index)
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{
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struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
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int err, retries = 3;
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if (phy->gpio_vbus_det < 0) {
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eprintf("Error: invalid vbus detection pin\n");
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return phy->gpio_vbus_det;
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}
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err = gpio_get_value(phy->gpio_vbus_det);
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/*
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* Vbus may have been provided by the board and just been turned of
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* some milliseconds ago on reset, what we're measuring then is a
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* residual charge on Vbus, sleep a bit and try again.
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*/
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while (err > 0 && retries--) {
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mdelay(100);
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err = gpio_get_value(phy->gpio_vbus_det);
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}
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return err;
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}
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int sunxi_usb_phy_probe(void)
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{
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struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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struct sunxi_usb_phy *phy;
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int i, ret = 0;
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for (i = 0; i < CONFIG_SUNXI_USB_PHYS; i++) {
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phy = &sunxi_usb_phy[i];
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phy->gpio_vbus = get_vbus_gpio(i);
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if (phy->gpio_vbus >= 0) {
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ret = gpio_request(phy->gpio_vbus, "usb_vbus");
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if (ret)
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return ret;
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ret = gpio_direction_output(phy->gpio_vbus, 0);
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if (ret)
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return ret;
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}
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phy->gpio_vbus_det = get_vbus_detect_gpio(i);
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if (phy->gpio_vbus_det >= 0) {
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ret = gpio_request(phy->gpio_vbus_det, "usb_vbus_det");
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if (ret)
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return ret;
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ret = gpio_direction_input(phy->gpio_vbus_det);
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if (ret)
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return ret;
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}
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}
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setbits_le32(&ccm->usb_clk_cfg, CCM_USB_CTRL_PHYGATE);
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return 0;
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}
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int sunxi_usb_phy_remove(void)
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{
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struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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struct sunxi_usb_phy *phy;
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int i;
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clrbits_le32(&ccm->usb_clk_cfg, CCM_USB_CTRL_PHYGATE);
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for (i = 0; i < CONFIG_SUNXI_USB_PHYS; i++) {
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phy = &sunxi_usb_phy[i];
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if (phy->gpio_vbus >= 0)
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gpio_free(phy->gpio_vbus);
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if (phy->gpio_vbus_det >= 0)
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gpio_free(phy->gpio_vbus_det);
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}
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return 0;
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}
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