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@ -0,0 +1,12 @@ |
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CFLAGS = -Wall -O2
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all: apu-ehci |
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apu-ehco: apu-ehci.o |
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$(CC) -o $@ $^
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%.o: %.c |
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$(CC) $(CFLAGS) -o $@ -c $<
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clean: |
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@rm -f *.o apu-ehci
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@ -0,0 +1,186 @@ |
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/* Tool to route USB Ports 8+9 to EHCI instead of XHCI on an AMD APU */ |
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/* (C) 2022 by Harald Welte <laforge@gnumonks.org> */ |
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/* To the extent possible under law, the author(s) have dedicated all
|
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* copyright and related and neighboring rights to this software to the |
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* public domain worldwide. This software is distributed without any |
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* warranty. |
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* You should have received a copy of the CC0 Public Domain Dedication |
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* along with this software. If not, see |
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* <http://creativecommons.org/publicdomain/zero/1.0/>. */
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdint.h> |
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#include <stdbool.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <sys/io.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#define IOPORT_PMINDEX 0xCD6 |
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#define IOPORT_PMDATA 0xCD7 |
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/* Page 938 of "BKDG for AMD Family 16h Models 30-3Fh Processors" */ |
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#define PM_REG_USB_ENABLE 0xEF |
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static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, |
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unsigned int *ecx, unsigned int *edx) |
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{ |
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/* ecx is often an input as well as an output. */ |
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asm volatile("cpuid" |
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: "=a" (*eax), |
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"=b" (*ebx), |
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"=c" (*ecx), |
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"=d" (*edx) |
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: "0" (*eax), "2" (*ecx)); |
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} |
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static bool compatible_cpu(void) |
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{ |
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uint32_t eax, ebx, ecx, edx; |
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uint16_t model, family; |
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eax = 1; |
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native_cpuid(&eax, &ebx, &ecx, &edx); |
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family = (eax >> 8) & 0xf; |
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model = (eax >> 4) & 0xf; |
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if ((family == 6) | (family == 15)) |
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model |= ((eax >> 16) & 0x0f) << 4; |
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if (family == 15) |
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family += ((eax >> 20) & 0xff); |
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printf("Detected CPU Family: 0x%x, Model: 0x%x\n", family, model); |
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if (family != 0x16) |
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return false; |
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if (model < 0x30 || model > 0x3f) |
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return false; |
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return true; |
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} |
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static uint8_t apu_read_pm_reg(uint8_t reg) |
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{ |
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outb(reg, IOPORT_PMINDEX); |
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return inb(IOPORT_PMDATA); |
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} |
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static void apu_write_pm_reg(uint8_t reg, uint8_t val) |
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{ |
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outb(reg, IOPORT_PMINDEX); |
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outb(val, IOPORT_PMDATA); |
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} |
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static int apu_write_pm_reg_verify(uint8_t reg, uint8_t val) |
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{ |
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uint8_t val2; |
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apu_write_pm_reg(reg, val); |
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val2 = apu_read_pm_reg(reg); |
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if (val != val2) { |
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fprintf(stderr, "Wrote 0x%02x to register 0x%02x, but verify renders 0x%02x\n", val, reg, val2); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int usb_port89_to_ehci(bool to_ehci) |
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{ |
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uint8_t reg; |
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printf("Routing USB Ports 8+8 to %s\n", to_ehci ? "EHCI2" : "XHCI"); |
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reg = apu_read_pm_reg(PM_REG_USB_ENABLE); |
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if (to_ehci) |
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reg &= ~0x80; /* route USB8+USB9 to EHCI */ |
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else |
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reg |= 0x80; |
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return apu_write_pm_reg_verify(PM_REG_USB_ENABLE, reg); |
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} |
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static int ehci2_enable(bool enable) |
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{ |
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uint8_t reg; |
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printf("%sabling USB EHCI Controller 2\n", enable ? "En" : "Dis"); |
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reg = apu_read_pm_reg(PM_REG_USB_ENABLE); |
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if (enable) |
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reg |= 0x20; |
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else |
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reg &= ~0x20; |
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return apu_write_pm_reg_verify(PM_REG_USB_ENABLE, reg); |
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} |
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static int rescan_pci(void) |
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{ |
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int rc, fd; |
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fd = open("/sys/bus/pci/rescan", O_WRONLY); |
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if (fd < 0) { |
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fprintf(stderr, "Error opening /sys/bus/pci/rescan: %s\n", strerror(errno)); |
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return fd; |
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} |
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printf("Instructing kernel to re-scan PCI bus\n"); |
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rc = write(fd, "1\n", 2); |
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if (rc != 2) { |
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fprintf(stderr, "Error writing to /sys/bus/pci/rescan: %s\n", strerror(errno)); |
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close(fd); |
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return rc; |
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} |
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close(fd); |
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return 0; |
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} |
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static void print_usage(void) |
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{ |
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printf("Usage: apu-ehci (enable|disable)\n"); |
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} |
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int main(int argc, char **argv) |
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{ |
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int rc; |
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rc = ioperm(IOPORT_PMINDEX, 2, 1); |
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if (rc < 0) { |
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fprintf(stderr, "Unalbe to access I/O ports: %s\n", strerror(errno)); |
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return rc; |
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} |
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if (argc < 2) { |
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print_usage(); |
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exit(0); |
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} |
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if (!compatible_cpu()) { |
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fprintf(stderr, "Your CPU is not an AMD APU compatible with this program\n"); |
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exit(1); |
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} |
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if (!strcmp(argv[1], "enable")) { |
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usb_port89_to_ehci(true); |
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ehci2_enable(true); |
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rescan_pci(); |
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} else if (!strcmp(argv[1], "disable")) { |
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usb_port89_to_ehci(false); |
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ehci2_enable(false); |
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rescan_pci(); |
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} else { |
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print_usage(); |
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exit(2); |
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} |
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} |
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