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-rw-r--r--arch/x86/kernel/early_printk.c715
1 files changed, 0 insertions, 715 deletions
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index b11cab3c323..519a5e10be5 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -160,721 +160,6 @@ static struct console early_serial_console = {
.index = -1,
};
-#ifdef CONFIG_EARLY_PRINTK_DBGP
-
-static struct ehci_caps __iomem *ehci_caps;
-static struct ehci_regs __iomem *ehci_regs;
-static struct ehci_dbg_port __iomem *ehci_debug;
-static unsigned int dbgp_endpoint_out;
-
-struct ehci_dev {
- u32 bus;
- u32 slot;
- u32 func;
-};
-
-static struct ehci_dev ehci_dev;
-
-#define USB_DEBUG_DEVNUM 127
-
-#define DBGP_DATA_TOGGLE 0x8800
-
-static inline u32 dbgp_pid_update(u32 x, u32 tok)
-{
- return ((x ^ DBGP_DATA_TOGGLE) & 0xffff00) | (tok & 0xff);
-}
-
-static inline u32 dbgp_len_update(u32 x, u32 len)
-{
- return (x & ~0x0f) | (len & 0x0f);
-}
-
-/*
- * USB Packet IDs (PIDs)
- */
-
-/* token */
-#define USB_PID_OUT 0xe1
-#define USB_PID_IN 0x69
-#define USB_PID_SOF 0xa5
-#define USB_PID_SETUP 0x2d
-/* handshake */
-#define USB_PID_ACK 0xd2
-#define USB_PID_NAK 0x5a
-#define USB_PID_STALL 0x1e
-#define USB_PID_NYET 0x96
-/* data */
-#define USB_PID_DATA0 0xc3
-#define USB_PID_DATA1 0x4b
-#define USB_PID_DATA2 0x87
-#define USB_PID_MDATA 0x0f
-/* Special */
-#define USB_PID_PREAMBLE 0x3c
-#define USB_PID_ERR 0x3c
-#define USB_PID_SPLIT 0x78
-#define USB_PID_PING 0xb4
-#define USB_PID_UNDEF_0 0xf0
-
-#define USB_PID_DATA_TOGGLE 0x88
-#define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE)
-
-#define PCI_CAP_ID_EHCI_DEBUG 0xa
-
-#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
-#define HUB_SHORT_RESET_TIME 10
-#define HUB_LONG_RESET_TIME 200
-#define HUB_RESET_TIMEOUT 500
-
-#define DBGP_MAX_PACKET 8
-
-static int dbgp_wait_until_complete(void)
-{
- u32 ctrl;
- int loop = 0x100000;
-
- do {
- ctrl = readl(&ehci_debug->control);
- /* Stop when the transaction is finished */
- if (ctrl & DBGP_DONE)
- break;
- } while (--loop > 0);
-
- if (!loop)
- return -1;
-
- /*
- * Now that we have observed the completed transaction,
- * clear the done bit.
- */
- writel(ctrl | DBGP_DONE, &ehci_debug->control);
- return (ctrl & DBGP_ERROR) ? -DBGP_ERRCODE(ctrl) : DBGP_LEN(ctrl);
-}
-
-static void __init dbgp_mdelay(int ms)
-{
- int i;
-
- while (ms--) {
- for (i = 0; i < 1000; i++)
- outb(0x1, 0x80);
- }
-}
-
-static void dbgp_breath(void)
-{
- /* Sleep to give the debug port a chance to breathe */
-}
-
-static int dbgp_wait_until_done(unsigned ctrl)
-{
- u32 pids, lpid;
- int ret;
- int loop = 3;
-
-retry:
- writel(ctrl | DBGP_GO, &ehci_debug->control);
- ret = dbgp_wait_until_complete();
- pids = readl(&ehci_debug->pids);
- lpid = DBGP_PID_GET(pids);
-
- if (ret < 0)
- return ret;
-
- /*
- * If the port is getting full or it has dropped data
- * start pacing ourselves, not necessary but it's friendly.
- */
- if ((lpid == USB_PID_NAK) || (lpid == USB_PID_NYET))
- dbgp_breath();
-
- /* If I get a NACK reissue the transmission */
- if (lpid == USB_PID_NAK) {
- if (--loop > 0)
- goto retry;
- }
-
- return ret;
-}
-
-static void dbgp_set_data(const void *buf, int size)
-{
- const unsigned char *bytes = buf;
- u32 lo, hi;
- int i;
-
- lo = hi = 0;
- for (i = 0; i < 4 && i < size; i++)
- lo |= bytes[i] << (8*i);
- for (; i < 8 && i < size; i++)
- hi |= bytes[i] << (8*(i - 4));
- writel(lo, &ehci_debug->data03);
- writel(hi, &ehci_debug->data47);
-}
-
-static void __init dbgp_get_data(void *buf, int size)
-{
- unsigned char *bytes = buf;
- u32 lo, hi;
- int i;
-
- lo = readl(&ehci_debug->data03);
- hi = readl(&ehci_debug->data47);
- for (i = 0; i < 4 && i < size; i++)
- bytes[i] = (lo >> (8*i)) & 0xff;
- for (; i < 8 && i < size; i++)
- bytes[i] = (hi >> (8*(i - 4))) & 0xff;
-}
-
-static int dbgp_bulk_write(unsigned devnum, unsigned endpoint,
- const char *bytes, int size)
-{
- u32 pids, addr, ctrl;
- int ret;
-
- if (size > DBGP_MAX_PACKET)
- return -1;
-
- addr = DBGP_EPADDR(devnum, endpoint);
-
- pids = readl(&ehci_debug->pids);
- pids = dbgp_pid_update(pids, USB_PID_OUT);
-
- ctrl = readl(&ehci_debug->control);
- ctrl = dbgp_len_update(ctrl, size);
- ctrl |= DBGP_OUT;
- ctrl |= DBGP_GO;
-
- dbgp_set_data(bytes, size);
- writel(addr, &ehci_debug->address);
- writel(pids, &ehci_debug->pids);
-
- ret = dbgp_wait_until_done(ctrl);
- if (ret < 0)
- return ret;
-
- return ret;
-}
-
-static int __init dbgp_bulk_read(unsigned devnum, unsigned endpoint, void *data,
- int size)
-{
- u32 pids, addr, ctrl;
- int ret;
-
- if (size > DBGP_MAX_PACKET)
- return -1;
-
- addr = DBGP_EPADDR(devnum, endpoint);
-
- pids = readl(&ehci_debug->pids);
- pids = dbgp_pid_update(pids, USB_PID_IN);
-
- ctrl = readl(&ehci_debug->control);
- ctrl = dbgp_len_update(ctrl, size);
- ctrl &= ~DBGP_OUT;
- ctrl |= DBGP_GO;
-
- writel(addr, &ehci_debug->address);
- writel(pids, &ehci_debug->pids);
- ret = dbgp_wait_until_done(ctrl);
- if (ret < 0)
- return ret;
-
- if (size > ret)
- size = ret;
- dbgp_get_data(data, size);
- return ret;
-}
-
-static int __init dbgp_control_msg(unsigned devnum, int requesttype,
- int request, int value, int index, void *data, int size)
-{
- u32 pids, addr, ctrl;
- struct usb_ctrlrequest req;
- int read;
- int ret;
-
- read = (requesttype & USB_DIR_IN) != 0;
- if (size > (read ? DBGP_MAX_PACKET:0))
- return -1;
-
- /* Compute the control message */
- req.bRequestType = requesttype;
- req.bRequest = request;
- req.wValue = cpu_to_le16(value);
- req.wIndex = cpu_to_le16(index);
- req.wLength = cpu_to_le16(size);
-
- pids = DBGP_PID_SET(USB_PID_DATA0, USB_PID_SETUP);
- addr = DBGP_EPADDR(devnum, 0);
-
- ctrl = readl(&ehci_debug->control);
- ctrl = dbgp_len_update(ctrl, sizeof(req));
- ctrl |= DBGP_OUT;
- ctrl |= DBGP_GO;
-
- /* Send the setup message */
- dbgp_set_data(&req, sizeof(req));
- writel(addr, &ehci_debug->address);
- writel(pids, &ehci_debug->pids);
- ret = dbgp_wait_until_done(ctrl);
- if (ret < 0)
- return ret;
-
- /* Read the result */
- return dbgp_bulk_read(devnum, 0, data, size);
-}
-
-
-/* Find a PCI capability */
-static u32 __init find_cap(u32 num, u32 slot, u32 func, int cap)
-{
- u8 pos;
- int bytes;
-
- if (!(read_pci_config_16(num, slot, func, PCI_STATUS) &
- PCI_STATUS_CAP_LIST))
- return 0;
-
- pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST);
- for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
- u8 id;
-
- pos &= ~3;
- id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID);
- if (id == 0xff)
- break;
- if (id == cap)
- return pos;
-
- pos = read_pci_config_byte(num, slot, func,
- pos+PCI_CAP_LIST_NEXT);
- }
- return 0;
-}
-
-static u32 __init __find_dbgp(u32 bus, u32 slot, u32 func)
-{
- u32 class;
-
- class = read_pci_config(bus, slot, func, PCI_CLASS_REVISION);
- if ((class >> 8) != PCI_CLASS_SERIAL_USB_EHCI)
- return 0;
-
- return find_cap(bus, slot, func, PCI_CAP_ID_EHCI_DEBUG);
-}
-
-static u32 __init find_dbgp(int ehci_num, u32 *rbus, u32 *rslot, u32 *rfunc)
-{
- u32 bus, slot, func;
-
- for (bus = 0; bus < 256; bus++) {
- for (slot = 0; slot < 32; slot++) {
- for (func = 0; func < 8; func++) {
- unsigned cap;
-
- cap = __find_dbgp(bus, slot, func);
-
- if (!cap)
- continue;
- if (ehci_num-- != 0)
- continue;
- *rbus = bus;
- *rslot = slot;
- *rfunc = func;
- return cap;
- }
- }
- }
- return 0;
-}
-
-static int __init ehci_reset_port(int port)
-{
- u32 portsc;
- u32 delay_time, delay;
- int loop;
-
- /* Reset the usb debug port */
- portsc = readl(&ehci_regs->port_status[port - 1]);
- portsc &= ~PORT_PE;
- portsc |= PORT_RESET;
- writel(portsc, &ehci_regs->port_status[port - 1]);
-
- delay = HUB_ROOT_RESET_TIME;
- for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT;
- delay_time += delay) {
- dbgp_mdelay(delay);
-
- portsc = readl(&ehci_regs->port_status[port - 1]);
- if (portsc & PORT_RESET) {
- /* force reset to complete */
- loop = 2;
- writel(portsc & ~(PORT_RWC_BITS | PORT_RESET),
- &ehci_regs->port_status[port - 1]);
- do {
- portsc = readl(&ehci_regs->port_status[port-1]);
- } while ((portsc & PORT_RESET) && (--loop > 0));
- }
-
- /* Device went away? */
- if (!(portsc & PORT_CONNECT))
- return -ENOTCONN;
-
- /* bomb out completely if something weird happend */
- if ((portsc & PORT_CSC))
- return -EINVAL;
-
- /* If we've finished resetting, then break out of the loop */
- if (!(portsc & PORT_RESET) && (portsc & PORT_PE))
- return 0;
- }
- return -EBUSY;
-}
-
-static int __init ehci_wait_for_port(int port)
-{
- u32 status;
- int ret, reps;
-
- for (reps = 0; reps < 3; reps++) {
- dbgp_mdelay(100);
- status = readl(&ehci_regs->status);
- if (status & STS_PCD) {
- ret = ehci_reset_port(port);
- if (ret == 0)
- return 0;
- }
- }
- return -ENOTCONN;
-}
-
-#ifdef DBGP_DEBUG
-# define dbgp_printk early_printk
-#else
-static inline void dbgp_printk(const char *fmt, ...) { }
-#endif
-
-typedef void (*set_debug_port_t)(int port);
-
-static void __init default_set_debug_port(int port)
-{
-}
-
-static set_debug_port_t __initdata set_debug_port = default_set_debug_port;
-
-static void __init nvidia_set_debug_port(int port)
-{
- u32 dword;
- dword = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func,
- 0x74);
- dword &= ~(0x0f<<12);
- dword |= ((port & 0x0f)<<12);
- write_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, 0x74,
- dword);
- dbgp_printk("set debug port to %d\n", port);
-}
-
-static void __init detect_set_debug_port(void)
-{
- u32 vendorid;
-
- vendorid = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func,
- 0x00);
-
- if ((vendorid & 0xffff) == 0x10de) {
- dbgp_printk("using nvidia set_debug_port\n");
- set_debug_port = nvidia_set_debug_port;
- }
-}
-
-static int __init ehci_setup(void)
-{
- struct usb_debug_descriptor dbgp_desc;
- u32 cmd, ctrl, status, portsc, hcs_params;
- u32 debug_port, new_debug_port = 0, n_ports;
- u32 devnum;
- int ret, i;
- int loop;
- int port_map_tried;
- int playtimes = 3;
-
-try_next_time:
- port_map_tried = 0;
-
-try_next_port:
-
- hcs_params = readl(&ehci_caps->hcs_params);
- debug_port = HCS_DEBUG_PORT(hcs_params);
- n_ports = HCS_N_PORTS(hcs_params);
-
- dbgp_printk("debug_port: %d\n", debug_port);
- dbgp_printk("n_ports: %d\n", n_ports);
-
- for (i = 1; i <= n_ports; i++) {
- portsc = readl(&ehci_regs->port_status[i-1]);
- dbgp_printk("portstatus%d: %08x\n", i, portsc);
- }
-
- if (port_map_tried && (new_debug_port != debug_port)) {
- if (--playtimes) {
- set_debug_port(new_debug_port);
- goto try_next_time;
- }
- return -1;
- }
-
- loop = 100000;
- /* Reset the EHCI controller */
- cmd = readl(&ehci_regs->command);
- cmd |= CMD_RESET;
- writel(cmd, &ehci_regs->command);
- do {
- cmd = readl(&ehci_regs->command);
- } while ((cmd & CMD_RESET) && (--loop > 0));
-
- if (!loop) {
- dbgp_printk("can not reset ehci\n");
- return -1;
- }
- dbgp_printk("ehci reset done\n");
-
- /* Claim ownership, but do not enable yet */
- ctrl = readl(&ehci_debug->control);
- ctrl |= DBGP_OWNER;
- ctrl &= ~(DBGP_ENABLED | DBGP_INUSE);
- writel(ctrl, &ehci_debug->control);
-
- /* Start the ehci running */
- cmd = readl(&ehci_regs->command);
- cmd &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE | CMD_ASE | CMD_RESET);
- cmd |= CMD_RUN;
- writel(cmd, &ehci_regs->command);
-
- /* Ensure everything is routed to the EHCI */
- writel(FLAG_CF, &ehci_regs->configured_flag);
-
- /* Wait until the controller is no longer halted */
- loop = 10;
- do {
- status = readl(&ehci_regs->status);
- } while ((status & STS_HALT) && (--loop > 0));
-
- if (!loop) {
- dbgp_printk("ehci can be started\n");
- return -1;
- }
- dbgp_printk("ehci started\n");
-
- /* Wait for a device to show up in the debug port */
- ret = ehci_wait_for_port(debug_port);
- if (ret < 0) {
- dbgp_printk("No device found in debug port\n");
- goto next_debug_port;
- }
- dbgp_printk("ehci wait for port done\n");
-
- /* Enable the debug port */
- ctrl = readl(&ehci_debug->control);
- ctrl |= DBGP_CLAIM;
- writel(ctrl, &ehci_debug->control);
- ctrl = readl(&ehci_debug->control);
- if ((ctrl & DBGP_CLAIM) != DBGP_CLAIM) {
- dbgp_printk("No device in debug port\n");
- writel(ctrl & ~DBGP_CLAIM, &ehci_debug->control);
- goto err;
- }
- dbgp_printk("debug ported enabled\n");
-
- /* Completely transfer the debug device to the debug controller */
- portsc = readl(&ehci_regs->port_status[debug_port - 1]);
- portsc &= ~PORT_PE;
- writel(portsc, &ehci_regs->port_status[debug_port - 1]);
-
- dbgp_mdelay(100);
-
- /* Find the debug device and make it device number 127 */
- for (devnum = 0; devnum <= 127; devnum++) {
- ret = dbgp_control_msg(devnum,
- USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
- USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0,
- &dbgp_desc, sizeof(dbgp_desc));
- if (ret > 0)
- break;
- }
- if (devnum > 127) {
- dbgp_printk("Could not find attached debug device\n");
- goto err;
- }
- if (ret < 0) {
- dbgp_printk("Attached device is not a debug device\n");
- goto err;
- }
- dbgp_endpoint_out = dbgp_desc.bDebugOutEndpoint;
-
- /* Move the device to 127 if it isn't already there */
- if (devnum != USB_DEBUG_DEVNUM) {
- ret = dbgp_control_msg(devnum,
- USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
- USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, NULL, 0);
- if (ret < 0) {
- dbgp_printk("Could not move attached device to %d\n",
- USB_DEBUG_DEVNUM);
- goto err;
- }
- devnum = USB_DEBUG_DEVNUM;
- dbgp_printk("debug device renamed to 127\n");
- }
-
- /* Enable the debug interface */
- ret = dbgp_control_msg(USB_DEBUG_DEVNUM,
- USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
- USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, NULL, 0);
- if (ret < 0) {
- dbgp_printk(" Could not enable the debug device\n");
- goto err;
- }
- dbgp_printk("debug interface enabled\n");
-
- /* Perform a small write to get the even/odd data state in sync
- */
- ret = dbgp_bulk_write(USB_DEBUG_DEVNUM, dbgp_endpoint_out, " ", 1);
- if (ret < 0) {
- dbgp_printk("dbgp_bulk_write failed: %d\n", ret);
- goto err;
- }
- dbgp_printk("small write doned\n");
-
- return 0;
-err:
- /* Things didn't work so remove my claim */
- ctrl = readl(&ehci_debug->control);
- ctrl &= ~(DBGP_CLAIM | DBGP_OUT);
- writel(ctrl, &ehci_debug->control);
- return -1;
-
-next_debug_port:
- port_map_tried |= (1<<(debug_port - 1));
- new_debug_port = ((debug_port-1+1)%n_ports) + 1;
- if (port_map_tried != ((1<<n_ports) - 1)) {
- set_debug_port(new_debug_port);
- goto try_next_port;
- }
- if (--playtimes) {
- set_debug_port(new_debug_port);
- goto try_next_time;
- }
-
- return -1;
-}
-
-static int __init early_dbgp_init(char *s)
-{
- u32 debug_port, bar, offset;
- u32 bus, slot, func, cap;
- void __iomem *ehci_bar;
- u32 dbgp_num;
- u32 bar_val;
- char *e;
- int ret;
- u8 byte;
-
- if (!early_pci_allowed())
- return -1;
-
- dbgp_num = 0;
- if (*s)
- dbgp_num = simple_strtoul(s, &e, 10);
- dbgp_printk("dbgp_num: %d\n", dbgp_num);
-
- cap = find_dbgp(dbgp_num, &bus, &slot, &func);
- if (!cap)
- return -1;
-
- dbgp_printk("Found EHCI debug port on %02x:%02x.%1x\n", bus, slot,
- func);
-
- debug_port = read_pci_config(bus, slot, func, cap);
- bar = (debug_port >> 29) & 0x7;
- bar = (bar * 4) + 0xc;
- offset = (debug_port >> 16) & 0xfff;
- dbgp_printk("bar: %02x offset: %03x\n", bar, offset);
- if (bar != PCI_BASE_ADDRESS_0) {
- dbgp_printk("only debug ports on bar 1 handled.\n");
-
- return -1;
- }
-
- bar_val = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
- dbgp_printk("bar_val: %02x offset: %03x\n", bar_val, offset);
- if (bar_val & ~PCI_BASE_ADDRESS_MEM_MASK) {
- dbgp_printk("only simple 32bit mmio bars supported\n");
-
- return -1;
- }
-
- /* double check if the mem space is enabled */
- byte = read_pci_config_byte(bus, slot, func, 0x04);
- if (!(byte & 0x2)) {
- byte |= 0x02;
- write_pci_config_byte(bus, slot, func, 0x04, byte);
- dbgp_printk("mmio for ehci enabled\n");
- }
-
- /*
- * FIXME I don't have the bar size so just guess PAGE_SIZE is more
- * than enough. 1K is the biggest I have seen.
- */
- set_fixmap_nocache(FIX_DBGP_BASE, bar_val & PAGE_MASK);
- ehci_bar = (void __iomem *)__fix_to_virt(FIX_DBGP_BASE);
- ehci_bar += bar_val & ~PAGE_MASK;
- dbgp_printk("ehci_bar: %p\n", ehci_bar);
-
- ehci_caps = ehci_bar;
- ehci_regs = ehci_bar + HC_LENGTH(readl(&ehci_caps->hc_capbase));
- ehci_debug = ehci_bar + offset;
- ehci_dev.bus = bus;
- ehci_dev.slot = slot;
- ehci_dev.func = func;
-
- detect_set_debug_port();
-
- ret = ehci_setup();
- if (ret < 0) {
- dbgp_printk("ehci_setup failed\n");
- ehci_debug = NULL;
-
- return -1;
- }
-
- return 0;
-}
-
-static void early_dbgp_write(struct console *con, const char *str, u32 n)
-{
- int chunk, ret;
-
- if (!ehci_debug)
- return;
- while (n > 0) {
- chunk = n;
- if (chunk > DBGP_MAX_PACKET)
- chunk = DBGP_MAX_PACKET;
- ret = dbgp_bulk_write(USB_DEBUG_DEVNUM,
- dbgp_endpoint_out, str, chunk);
- str += chunk;
- n -= chunk;
- }
-}
-
-static struct console early_dbgp_console = {
- .name = "earlydbg",
- .write = early_dbgp_write,
- .flags = CON_PRINTBUFFER,
- .index = -1,
-};
-#endif
-
/* Direct interface for emergencies */
static struct console *early_console = &early_vga_console;
static int __initdata early_console_initialized;
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-30 15:59:13 +0000