[src/trunk]: src/sys/arch/evbarm/rpi Enable UART0 (PL011) on GPIO header for ...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f0436a5c7fa8
branches:  trunk
changeset: 354481:f0436a5c7fa8
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jun 17 22:50:23 2017 +0000

description:
Enable UART0 (PL011) on GPIO header for Raspberry Pi 3 / Zero W

diffstat:

 sys/arch/evbarm/rpi/rpi_machdep.c |  28 +++++++++++++++++++++++++---
 1 files changed, 25 insertions(+), 3 deletions(-)

diffs (70 lines):

diff -r b25d2c6dac1d -r f0436a5c7fa8 sys/arch/evbarm/rpi/rpi_machdep.c
--- a/sys/arch/evbarm/rpi/rpi_machdep.c Sat Jun 17 22:49:37 2017 +0000
+++ b/sys/arch/evbarm/rpi/rpi_machdep.c Sat Jun 17 22:50:23 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rpi_machdep.c,v 1.71 2017/06/17 17:03:40 jmcneill Exp $        */
+/*     $NetBSD: rpi_machdep.c,v 1.72 2017/06/17 22:50:23 jmcneill Exp $        */
 
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rpi_machdep.c,v 1.71 2017/06/17 17:03:40 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rpi_machdep.c,v 1.72 2017/06/17 22:50:23 jmcneill Exp $");
 
 #include "opt_arm_debug.h"
 #include "opt_bcm283x.h"
@@ -74,6 +74,7 @@
 #include <arm/broadcom/bcm2835var.h>
 #include <arm/broadcom/bcm2835_pmvar.h>
 #include <arm/broadcom/bcm2835_mbox.h>
+#include <arm/broadcom/bcm2835_gpio_subr.h>
 #include <arm/broadcom/bcm_amba.h>
 
 #include <evbarm/rpi/vcio.h>
@@ -180,6 +181,7 @@
 static struct __aligned(16) {
        struct vcprop_buffer_hdr        vb_hdr;
        struct vcprop_tag_clockrate     vbt_uartclockrate;
+       struct vcprop_tag_boardrev      vbt_boardrev;
        struct vcprop_tag end;
 } vb_uart = {
        .vb_hdr = {
@@ -194,6 +196,13 @@
                },
                .id = VCPROP_CLK_UART
        },
+       .vbt_boardrev = {
+               .tag = {
+                       .vpt_tag = VCPROPTAG_GET_BOARDREVISION,
+                       .vpt_len = VCPROPTAG_LEN(vb_uart.vbt_boardrev),
+                       .vpt_rcode = VCPROPTAG_REQUEST
+               },
+       },
        .end = {
                .vpt_tag = VCPROPTAG_NULL
        }
@@ -426,7 +435,20 @@
 
        bcm2835_mbox_read(iot, ioh, BCMMBOX_CHANARM2VC, &res);
 
-       cpu_dcache_inv_range((vaddr_t)&vb, sizeof(vb));
+       cpu_dcache_inv_range((vaddr_t)&vb_uart, sizeof(vb_uart));
+
+       if (vcprop_tag_success_p(&vb_uart.vbt_boardrev.tag) &&
+           (vb_uart.vbt_boardrev.rev & VCPROP_REV_ENCFLAG) != 0) {
+               const uint32_t rev = vb_uart.vbt_boardrev.rev;
+               switch (__SHIFTOUT(rev, VCPROP_REV_MODEL)) {
+               case RPI_MODEL_B_PI3:
+               case RPI_MODEL_ZERO_W:
+                       /* Enable UART0 (PL011) on GPIO header */
+                       bcm2835gpio_function_select(14, BCM2835_GPIO_ALT0);
+                       bcm2835gpio_function_select(15, BCM2835_GPIO_ALT0);
+                       break;
+               }
+       }
 
        if (vcprop_tag_success_p(&vb_uart.vbt_uartclockrate.tag))
                uart_clk = vb_uart.vbt_uartclockrate.rate;