diff options
author | Peng Fan <peng.fan@nxp.com> | 2018-11-15 13:18:53 +0800 |
---|---|---|
committer | Peng Fan <peng.fan@nxp.com> | 2018-11-15 16:36:54 +0800 |
commit | 75a9833506aa13c1d5a8641c81ac951c41ced55e (patch) | |
tree | 704679e38d8153b13b2283c3f6357c79b74d53f2 /drivers | |
parent | c96a9844cd3342f6e31627ccc4f3e63544ffd78e (diff) |
MLK-20373-5 serial: serial_xen: support normal uboot console
Support output/input using `xl console [domid]`.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Flynn xu <flynn.xu@nxp.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/serial/serial_xen.c | 196 |
1 files changed, 168 insertions, 28 deletions
diff --git a/drivers/serial/serial_xen.c b/drivers/serial/serial_xen.c index ce0c36319b..52b2c120ab 100644 --- a/drivers/serial/serial_xen.c +++ b/drivers/serial/serial_xen.c @@ -5,66 +5,206 @@ */ #include <common.h> +#include <debug_uart.h> #include <dm.h> #include <errno.h> +#include <fdtdec.h> +#include <linux/compiler.h> #include <serial.h> -extern void xenprintf(const char *buf); -extern void xenprintc(const char c); -#ifndef CONFIG_DM_SERIAL +#include <xen/events.h> +#include <xen/hvm.h> +#include <xen/interface/sched.h> +#include <xen/interface/hvm/hvm_op.h> +#include <xen/interface/hvm/params.h> +#include <xen/interface/io/console.h> +#include <xen/interface/io/ring.h> -static void xen_debug_serial_putc(const char c) +DECLARE_GLOBAL_DATA_PTR; + +#ifdef CONFIG_DM_SERIAL +struct xen_uart_priv { + struct xencons_interface *intf; + u32 evtchn; + int vtermno; + struct hvc_struct *hvc; + grant_ref_t gntref; +}; + +int xen_serial_setbrg(struct udevice *dev, int baudrate) { - /* If \n, also do \r */ - if (c == '\n') - serial_putc('\r'); + return 0; +} + +static int xen_serial_probe(struct udevice *dev) +{ + struct xen_uart_priv *priv = dev_get_priv(dev); + u64 v = 0; + unsigned long gfn; + int r; + + r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v); + if (r < 0 || v == 0) + return r; + + priv->evtchn = v; + + r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v); + if (r < 0 || v == 0) + return -ENODEV; + + gfn = v; + + priv->intf = (struct xencons_interface *)(gfn << XEN_PAGE_SHIFT); + if (!priv->intf) + return -EINVAL; - xenprintc(c); + return 0; } -static void xen_debug_serial_puts(const char *buf) +static int xen_serial_pending(struct udevice *dev, bool input) { - xenprintf(buf); + struct xen_uart_priv *priv = dev_get_priv(dev); + struct xencons_interface *intf = priv->intf; + + if (!input || intf->in_cons == intf->in_prod) + return 0; + + return 1; } -static int xen_debug_serial_start(void) +static int xen_serial_getc(struct udevice *dev) { - return 0; + struct xen_uart_priv *priv = dev_get_priv(dev); + struct xencons_interface *intf = priv->intf; + XENCONS_RING_IDX cons; + char c; + + while (intf->in_cons == intf->in_prod) { + mb(); /* wait */ + } + + cons = intf->in_cons; + mb(); /* get pointers before reading ring */ + + c = intf->in[MASK_XENCONS_IDX(cons++, intf->in)]; + + mb(); /* read ring before consuming */ + intf->in_cons = cons; + + notify_remote_via_evtchn(priv->evtchn); + + return c; } -static void xen_debug_serial_setbrg(void) +static int __write_console(struct udevice *dev, const char *data, int len) { + struct xen_uart_priv *priv = dev_get_priv(dev); + struct xencons_interface *intf = priv->intf; + XENCONS_RING_IDX cons, prod; + int sent = 0; + + cons = intf->out_cons; + prod = intf->out_prod; + mb(); /* Update pointer */ + + WARN_ON((prod - cons) > sizeof(intf->out)); + + while ((sent < len) && ((prod - cons) < sizeof(intf->out))) + intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++]; + + mb(); /* Update data before pointer */ + intf->out_prod = prod; + if (sent) + notify_remote_via_evtchn(priv->evtchn); + + if (data[sent - 1] == '\n') + serial_puts("\r"); + + return sent; +} + +static int write_console(struct udevice *dev, const char *data, int len) +{ + /* + * Make sure the whole buffer is emitted, polling if + * necessary. We don't ever want to rely on the hvc daemon + * because the most interesting console output is when the + * kernel is crippled. + */ + while (len) { + int sent = __write_console(dev, data, len); + + data += sent; + len -= sent; + + if (unlikely(len)) + HYPERVISOR_sched_op(SCHEDOP_yield, NULL); + } + + return 0; } -static int xen_debug_serial_getc(void) +static int xen_serial_puts(struct udevice *dev, const char *str) { + write_console(dev, str, strlen(str)); + return 0; } -static int xen_debug_serial_tstc(void) +static int xen_serial_putc(struct udevice *dev, const char ch) { + write_console(dev, &ch, 1); + return 0; } -static struct serial_device xen_debug_serial_drv = { - .name = "xen_debug_serial", - .start = xen_debug_serial_start, - .stop = NULL, - .setbrg = xen_debug_serial_setbrg, - .putc = xen_debug_serial_putc, - .puts = xen_debug_serial_puts, - .getc = xen_debug_serial_getc, - .tstc = xen_debug_serial_tstc, +static const struct dm_serial_ops xen_serial_ops = { + .puts = xen_serial_puts, + .putc = xen_serial_putc, + .getc = xen_serial_getc, + .pending = xen_serial_pending, }; -void xen_debug_serial_initialize(void) +static const struct udevice_id xen_serial_ids[] = { + { .compatible = "xen,xen" }, + { } +}; + +U_BOOT_DRIVER(serial_xen) = { + .name = "serial_xen", + .id = UCLASS_SERIAL, + .of_match = xen_serial_ids, + .priv_auto_alloc_size = sizeof(struct xen_uart_priv), + .probe = xen_serial_probe, + .ops = &xen_serial_ops, + .flags = DM_FLAG_PRE_RELOC, +}; +#else +__weak struct serial_device *default_serial_console(void) { - serial_register(&xen_debug_serial_drv); + return NULL; } -__weak struct serial_device *default_serial_console(void) +#endif + +#ifdef CONFIG_DEBUG_UART_XEN +void _debug_uart_init(void) { - return &xen_debug_serial_drv; } + +void _debug_uart_putc(int ch) +{ + /* If \n, also do \r */ + if (ch == '\n') + serial_putc('\r'); + + (void)HYPERVISOR_console_io(CONSOLEIO_write, 1, &ch); + + return; +} + +DEBUG_UART_FUNCS + #endif |