diff options
Diffstat (limited to 'arch/arm/cpu/armv7/sunxi/usb_phy.c')
-rw-r--r-- | arch/arm/cpu/armv7/sunxi/usb_phy.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/usb_phy.c b/arch/arm/cpu/armv7/sunxi/usb_phy.c new file mode 100644 index 0000000..c238d38 --- /dev/null +++ b/arch/arm/cpu/armv7/sunxi/usb_phy.c @@ -0,0 +1,278 @@ +/* + * Sunxi usb-phy code + * + * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com> + * Copyright (C) 2014 Roman Byshko <rbyshko@gmail.com> + * + * Based on code from + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/arch/clock.h> +#include <asm/arch/cpu.h> +#include <asm/arch/usb_phy.h> +#include <asm/gpio.h> +#include <asm/io.h> +#include <errno.h> +#ifdef CONFIG_AXP152_POWER +#include <axp152.h> +#endif +#ifdef CONFIG_AXP209_POWER +#include <axp209.h> +#endif +#ifdef CONFIG_AXP221_POWER +#include <axp221.h> +#endif + +#define SUNXI_USB_PMU_IRQ_ENABLE 0x800 +#ifdef CONFIG_MACH_SUN8I_A33 +#define SUNXI_USB_CSR 0x410 +#else +#define SUNXI_USB_CSR 0x404 +#endif +#define SUNXI_USB_PASSBY_EN 1 + +#define SUNXI_EHCI_AHB_ICHR8_EN (1 << 10) +#define SUNXI_EHCI_AHB_INCR4_BURST_EN (1 << 9) +#define SUNXI_EHCI_AHB_INCRX_ALIGN_EN (1 << 8) +#define SUNXI_EHCI_ULPI_BYPASS_EN (1 << 0) + +static struct sunxi_usb_phy { + int usb_rst_mask; + int gpio_vbus; + int gpio_vbus_det; + int id; +} sunxi_usb_phy[] = { + { + .usb_rst_mask = CCM_USB_CTRL_PHY0_RST | CCM_USB_CTRL_PHY0_CLK, + .id = 0, + }, + { + .usb_rst_mask = CCM_USB_CTRL_PHY1_RST | CCM_USB_CTRL_PHY1_CLK, + .id = 1, + }, +#if (CONFIG_USB_MAX_CONTROLLER_COUNT > 1) + { + .usb_rst_mask = CCM_USB_CTRL_PHY2_RST | CCM_USB_CTRL_PHY2_CLK, + .id = 2, + } +#endif +}; + +static int sunxi_usb_phy_enabled_count; + +static int get_vbus_gpio(int index) +{ + switch (index) { + case 0: return sunxi_name_to_gpio(CONFIG_USB0_VBUS_PIN); + case 1: return sunxi_name_to_gpio(CONFIG_USB1_VBUS_PIN); + case 2: return sunxi_name_to_gpio(CONFIG_USB2_VBUS_PIN); + } + return -EINVAL; +} + +static int get_vbus_detect_gpio(int index) +{ + switch (index) { + case 0: return sunxi_name_to_gpio(CONFIG_USB0_VBUS_DET); + } + return -EINVAL; +} + +static void usb_phy_write(struct sunxi_usb_phy *phy, int addr, + int data, int len) +{ + int j = 0, usbc_bit = 0; + void *dest = (void *)SUNXI_USB0_BASE + SUNXI_USB_CSR; + +#ifdef CONFIG_MACH_SUN8I_A33 + /* CSR needs to be explicitly initialized to 0 on A33 */ + writel(0, dest); +#endif + + usbc_bit = 1 << (phy->id * 2); + for (j = 0; j < len; j++) { + /* set the bit address to be written */ + clrbits_le32(dest, 0xff << 8); + setbits_le32(dest, (addr + j) << 8); + + clrbits_le32(dest, usbc_bit); + /* set data bit */ + if (data & 0x1) + setbits_le32(dest, 1 << 7); + else + clrbits_le32(dest, 1 << 7); + + setbits_le32(dest, usbc_bit); + + clrbits_le32(dest, usbc_bit); + + data >>= 1; + } +} + +static void sunxi_usb_phy_config(struct sunxi_usb_phy *phy) +{ + /* The following comments are machine + * translated from Chinese, you have been warned! + */ + + /* Regulation 45 ohms */ + if (phy->id == 0) + usb_phy_write(phy, 0x0c, 0x01, 1); + + /* adjust PHY's magnitude and rate */ + usb_phy_write(phy, 0x20, 0x14, 5); + + /* threshold adjustment disconnect */ +#if defined CONFIG_MACH_SUN4I || defined CONFIG_MACH_SUN6I + usb_phy_write(phy, 0x2a, 3, 2); +#else + usb_phy_write(phy, 0x2a, 2, 2); +#endif + + return; +} + +static void sunxi_usb_phy_passby(int index, int enable) +{ + unsigned long bits = 0; + void *addr; + + if (index == 1) + addr = (void *)SUNXI_USB1_BASE + SUNXI_USB_PMU_IRQ_ENABLE; + else + addr = (void *)SUNXI_USB2_BASE + SUNXI_USB_PMU_IRQ_ENABLE; + + bits = SUNXI_EHCI_AHB_ICHR8_EN | + SUNXI_EHCI_AHB_INCR4_BURST_EN | + SUNXI_EHCI_AHB_INCRX_ALIGN_EN | + SUNXI_EHCI_ULPI_BYPASS_EN; + + if (enable) + setbits_le32(addr, bits); + else + clrbits_le32(addr, bits); + + return; +} + +void sunxi_usb_phy_enable_squelch_detect(int index, int enable) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + + usb_phy_write(phy, 0x3c, enable ? 0 : 2, 2); +} + +int sunxi_usb_phy_probe(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + int ret = 0; + + phy->gpio_vbus = get_vbus_gpio(index); + if (phy->gpio_vbus >= 0) { + ret |= gpio_request(phy->gpio_vbus, "usbc_vbus"); + ret |= gpio_direction_output(phy->gpio_vbus, 0); + } + + phy->gpio_vbus_det = get_vbus_detect_gpio(index); + if (phy->gpio_vbus_det >= 0) { + ret |= gpio_request(phy->gpio_vbus_det, "usbc_vbus_det"); + ret |= gpio_direction_input(phy->gpio_vbus_det); + } + + return ret; +} + +int sunxi_usb_phy_remove(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + int ret = 0; + + if (phy->gpio_vbus >= 0) + ret |= gpio_free(phy->gpio_vbus); + + if (phy->gpio_vbus_det >= 0) + ret |= gpio_free(phy->gpio_vbus_det); + + return ret; +} + +void sunxi_usb_phy_init(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE; + + /* enable common PHY only once */ + if (sunxi_usb_phy_enabled_count == 0) + setbits_le32(&ccm->usb_clk_cfg, CCM_USB_CTRL_PHYGATE); + + setbits_le32(&ccm->usb_clk_cfg, phy->usb_rst_mask); + + sunxi_usb_phy_config(phy); + + if (phy->id != 0) + sunxi_usb_phy_passby(index, SUNXI_USB_PASSBY_EN); + + sunxi_usb_phy_enabled_count++; +} + +void sunxi_usb_phy_exit(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE; + + if (phy->id != 0) + sunxi_usb_phy_passby(index, !SUNXI_USB_PASSBY_EN); + + clrbits_le32(&ccm->usb_clk_cfg, phy->usb_rst_mask); + + /* disable common PHY only once, for the last enabled phy */ + if (sunxi_usb_phy_enabled_count == 1) + clrbits_le32(&ccm->usb_clk_cfg, CCM_USB_CTRL_PHYGATE); + + sunxi_usb_phy_enabled_count--; +} + +void sunxi_usb_phy_power_on(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + + if (phy->gpio_vbus >= 0) + gpio_set_value(phy->gpio_vbus, 1); +} + +void sunxi_usb_phy_power_off(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + + if (phy->gpio_vbus >= 0) + gpio_set_value(phy->gpio_vbus, 0); +} + +int sunxi_usb_phy_vbus_detect(int index) +{ + struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; + int err, retries = 3; + + if (phy->gpio_vbus_det < 0) { + eprintf("Error: invalid vbus detection pin\n"); + return phy->gpio_vbus_det; + } + + err = gpio_get_value(phy->gpio_vbus_det); + /* + * Vbus may have been provided by the board and just been turned of + * some milliseconds ago on reset, what we're measuring then is a + * residual charge on Vbus, sleep a bit and try again. + */ + while (err > 0 && retries--) { + mdelay(100); + err = gpio_get_value(phy->gpio_vbus_det); + } + + return err; +} |