target/linux/ramips/patches-3.8/0128-MIPS-ralink-add-pinmux-driver.patch

   1 From 5a2079532dfaf5762f658370ee7a0afb686f066e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Mon, 22 Apr 2013 23:11:42 +0200
   4 Subject: [PATCH 128/137] MIPS: ralink: add pinmux driver
   5
   6 Add code to setup the pinmux on ralonk SoC. The SoC has a single 32 bit register
   7 for this functionality with simple on/off bits. Building a full featured pinctrl
   8 driver would be overkill.
   9
  10 Signed-off-by: John Crispin <blogic@openwrt.org>
  11 ---
  12  arch/mips/ralink/Makefile |    2 +-
  13  arch/mips/ralink/common.h |    2 ++
  14  arch/mips/ralink/of.c     |    2 ++
  15  arch/mips/ralink/pinmux.c |   76 +++++++++++++++++++++++++++++++++++++++++++++
  16  4 files changed, 81 insertions(+), 1 deletion(-)
  17  create mode 100644 arch/mips/ralink/pinmux.c
  18
  19 Index: linux-3.8.11/arch/mips/ralink/Makefile
  20 ===================================================================
  21 --- linux-3.8.11.orig/arch/mips/ralink/Makefile 2013-05-03 17:53:16.612004798 +0200
  22 +++ linux-3.8.11/arch/mips/ralink/Makefile      2013-05-04 13:20:48.455042975 +0200
  23 @@ -6,7 +6,7 @@
  24  # Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
  25  # Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  26
  27 -obj-y := prom.o of.o reset.o clk.o irq.o
  28 +obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o
  29
  30  obj-$(CONFIG_SOC_RT288X) += rt288x.o
  31  obj-$(CONFIG_SOC_RT305X) += rt305x.o
  32 Index: linux-3.8.11/arch/mips/ralink/common.h
  33 ===================================================================
  34 --- linux-3.8.11.orig/arch/mips/ralink/common.h 2013-05-03 17:53:16.720004800 +0200
  35 +++ linux-3.8.11/arch/mips/ralink/common.h      2013-05-04 13:20:48.055042959 +0200
  36 @@ -50,4 +50,6 @@
  37
  38  __iomem void *plat_of_remap_node(const char *node);
  39
  40 +void ralink_pinmux(void);
  41 +
  42  #endif /* _RALINK_COMMON_H__ */
  43 Index: linux-3.8.11/arch/mips/ralink/of.c
  44 ===================================================================
  45 --- linux-3.8.11.orig/arch/mips/ralink/of.c     2013-05-03 17:53:16.780004804 +0200
  46 +++ linux-3.8.11/arch/mips/ralink/of.c  2013-05-04 13:20:48.055042959 +0200
  47 @@ -110,6 +110,8 @@
  48         if (of_platform_populate(NULL, of_ids, NULL, NULL))
  49                 panic("failed to populate DT\n");
  50
  51 +       ralink_pinmux();
  52 +
  53         return 0;
  54  }
  55
  56 Index: linux-3.8.11/arch/mips/ralink/pinmux.c
  57 ===================================================================
  58 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  59 +++ linux-3.8.11/arch/mips/ralink/pinmux.c      2013-05-04 13:19:22.975039268 +0200
  60 @@ -0,0 +1,77 @@
  61 +/*
  62 + *  This program is free software; you can redistribute it and/or modify it
  63 + *  under the terms of the GNU General Public License version 2 as published
  64 + *  by the Free Software Foundation.
  65 + *
  66 + *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  67 + */
  68 +
  69 +#include <linux/kernel.h>
  70 +#include <linux/of.h>
  71 +
  72 +#include <asm/mach-ralink/ralink_regs.h>
  73 +
  74 +#include "common.h"
  75 +
  76 +#define SYSC_REG_GPIO_MODE     0x60
  77 +
  78 +static int ralink_mux_mask(const char *name, struct ralink_pinmux_grp *grps, u32* mask)
  79 +{
  80 +       for (; grps->name; grps++)
  81 +               if (!strcmp(grps->name, name)) {
  82 +                       *mask = grps->mask;
  83 +                       return 0;
  84 +               }
  85 +
  86 +       return -1;
  87 +}
  88 +
  89 +void ralink_pinmux(void)
  90 +{
  91 +       const __be32 *wdt;
  92 +       struct device_node *np;
  93 +       struct property *prop;
  94 +       const char *uart, *pin;
  95 +       u32 mode = 0;
  96 +       int m;
  97 +
  98 +       np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-sysc");
  99 +       if (!np)
 100 +               return;
 101 +
 102 +       of_property_for_each_string(np, "ralink,gpiomux", prop, pin) {
 103 +               if (!ralink_mux_mask(pin, rt_gpio_pinmux.mode, &m)) {
 104 +                       mode |= m;
 105 +                       pr_debug("pinmux: registered gpiomux \"%s\"\n", pin);
 106 +               } else {
 107 +                       pr_err("pinmux: failed to load \"%s\"\n", pin);
 108 +               }
 109 +       }
 110 +
 111 +       of_property_for_each_string(np, "ralink,pinmux", prop, pin) {
 112 +               if (!ralink_mux_mask(pin, rt_gpio_pinmux.mode, &m)) {
 113 +                       mode &= ~m;
 114 +                       pr_debug("pinmux: registered pinmux \"%s\"\n", pin);
 115 +               } else {
 116 +                       pr_err("pinmux: failed to load group \"%s\"\n", pin);
 117 +               }
 118 +       }
 119 +
 120 +       of_property_read_string(np, "ralink,uartmux", &uart);
 121 +       if (uart) {
 122 +               mode |= rt_gpio_pinmux.uart_mask << rt_gpio_pinmux.uart_shift;
 123 +               if (ralink_mux_mask(uart, rt_gpio_pinmux.uart, &m)) {
 124 +                       pr_err("pinmux: failed to load uartmux \"%s\"\n", uart);
 125 +               } else {
 126 +                       if (m != rt_gpio_pinmux.uart_mask)
 127 +                               mode &= ~(m << rt_gpio_pinmux.uart_shift);
 128 +                       pr_debug("pinmux: registered uartmux \"%s\"\n", uart);
 129 +               }
 130 +       }
 131 +
 132 +       wdt = of_get_property(np, "ralink,wdtmux", NULL);
 133 +       if (wdt && *wdt && rt_gpio_pinmux.wdt_reset)
 134 +               rt_gpio_pinmux.wdt_reset();
 135 +
 136 +       rt_sysc_w32(mode, SYSC_REG_GPIO_MODE);
 137 +}