arch/powerpc/boot/mpsc.c

   1 /*
   2  * MPSC/UART driver for the Marvell mv64360, mv64460, ...
   3  *
   4  * Author: Mark A. Greer <mgreer@mvista.com>
   5  *
   6  * 2007 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 #include <stdarg.h>
  13 #include <stddef.h>
  14 #include "types.h"
  15 #include "string.h"
  16 #include "stdio.h"
  17 #include "io.h"
  18 #include "ops.h"
  19
  20
  21 #define MPSC_CHR_1              0x000c
  22
  23 #define MPSC_CHR_2              0x0010
  24 #define MPSC_CHR_2_TA           (1<<7)
  25 #define MPSC_CHR_2_TCS          (1<<9)
  26 #define MPSC_CHR_2_RA           (1<<23)
  27 #define MPSC_CHR_2_CRD          (1<<25)
  28 #define MPSC_CHR_2_EH           (1<<31)
  29
  30 #define MPSC_CHR_4              0x0018
  31 #define MPSC_CHR_4_Z            (1<<29)
  32
  33 #define MPSC_CHR_5              0x001c
  34 #define MPSC_CHR_5_CTL1_INTR    (1<<12)
  35 #define MPSC_CHR_5_CTL1_VALID   (1<<15)
  36
  37 #define MPSC_CHR_10             0x0030
  38
  39 #define MPSC_INTR_CAUSE         0x0000
  40 #define MPSC_INTR_CAUSE_RCC     (1<<6)
  41 #define MPSC_INTR_MASK          0x0080
  42
  43 #define SDMA_SDCM               0x0008
  44 #define SDMA_SDCM_AR            (1<<15)
  45 #define SDMA_SDCM_AT            (1<<31)
  46
  47 static volatile char *mpsc_base;
  48 static volatile char *mpscintr_base;
  49 static u32 chr1, chr2;
  50
  51 static int mpsc_open(void)
  52 {
  53         chr1 = in_le32((u32 *)(mpsc_base + MPSC_CHR_1)) & 0x00ff0000;
  54         chr2 = in_le32((u32 *)(mpsc_base + MPSC_CHR_2)) & ~(MPSC_CHR_2_TA
  55                         | MPSC_CHR_2_TCS | MPSC_CHR_2_RA | MPSC_CHR_2_CRD
  56                         | MPSC_CHR_2_EH);
  57         out_le32((u32 *)(mpsc_base + MPSC_CHR_4), MPSC_CHR_4_Z);
  58         out_le32((u32 *)(mpsc_base + MPSC_CHR_5),
  59                         MPSC_CHR_5_CTL1_INTR | MPSC_CHR_5_CTL1_VALID);
  60         out_le32((u32 *)(mpsc_base + MPSC_CHR_2), chr2 | MPSC_CHR_2_EH);
  61         return 0;
  62 }
  63
  64 static void mpsc_putc(unsigned char c)
  65 {
  66         while (in_le32((u32 *)(mpsc_base + MPSC_CHR_2)) & MPSC_CHR_2_TCS);
  67
  68         out_le32((u32 *)(mpsc_base + MPSC_CHR_1), chr1 | c);
  69         out_le32((u32 *)(mpsc_base + MPSC_CHR_2), chr2 | MPSC_CHR_2_TCS);
  70 }
  71
  72 static unsigned char mpsc_getc(void)
  73 {
  74         u32 cause = 0;
  75         unsigned char c;
  76
  77         while (!(cause & MPSC_INTR_CAUSE_RCC))
  78                 cause = in_le32((u32 *)(mpscintr_base + MPSC_INTR_CAUSE));
  79
  80         c = in_8((u8 *)(mpsc_base + MPSC_CHR_10 + 2));
  81         out_8((u8 *)(mpsc_base + MPSC_CHR_10 + 2), c);
  82         out_le32((u32 *)(mpscintr_base + MPSC_INTR_CAUSE),
  83                         cause & ~MPSC_INTR_CAUSE_RCC);
  84
  85         return c;
  86 }
  87
  88 static u8 mpsc_tstc(void)
  89 {
  90         return (u8)((in_le32((u32 *)(mpscintr_base + MPSC_INTR_CAUSE))
  91                                 & MPSC_INTR_CAUSE_RCC) != 0);
  92 }
  93
  94 static void mpsc_stop_dma(volatile char *sdma_base)
  95 {
  96         out_le32((u32 *)(mpsc_base + MPSC_CHR_2),MPSC_CHR_2_TA | MPSC_CHR_2_RA);
  97         out_le32((u32 *)(sdma_base + SDMA_SDCM), SDMA_SDCM_AR | SDMA_SDCM_AT);
  98
  99         while ((in_le32((u32 *)(sdma_base + SDMA_SDCM))
 100                                 & (SDMA_SDCM_AR | SDMA_SDCM_AT)) != 0)
 101                 udelay(100);
 102 }
 103
 104 static volatile char *mpsc_get_virtreg_of_phandle(void *devp, char *prop)
 105 {
 106         void *v;
 107         int n;
 108
 109         n = getprop(devp, prop, &v, sizeof(v));
 110         if (n != sizeof(v))
 111                 goto err_out;
 112
 113         devp = find_node_by_linuxphandle((u32)v);
 114         if (devp == NULL)
 115                 goto err_out;
 116
 117         n = getprop(devp, "virtual-reg", &v, sizeof(v));
 118         if (n == sizeof(v))
 119                 return v;
 120
 121 err_out:
 122         return NULL;
 123 }
 124
 125 int mpsc_console_init(void *devp, struct serial_console_data *scdp)
 126 {
 127         void *v;
 128         int n, reg_set;
 129         volatile char *sdma_base;
 130
 131         n = getprop(devp, "virtual-reg", &v, sizeof(v));
 132         if (n != sizeof(v))
 133                 goto err_out;
 134         mpsc_base = v;
 135
 136         sdma_base = mpsc_get_virtreg_of_phandle(devp, "sdma");
 137         if (sdma_base == NULL)
 138                 goto err_out;
 139
 140         mpscintr_base = mpsc_get_virtreg_of_phandle(devp, "mpscintr");
 141         if (mpscintr_base == NULL)
 142                 goto err_out;
 143
 144         n = getprop(devp, "cell-index", &v, sizeof(v));
 145         if (n != sizeof(v))
 146                 goto err_out;
 147         reg_set = (int)v;
 148
 149         mpscintr_base += (reg_set == 0) ? 0x4 : 0xc;
 150
 151         /* Make sure the mpsc ctlrs are shutdown */
 152         out_le32((u32 *)(mpscintr_base + MPSC_INTR_CAUSE), 0);
 153         out_le32((u32 *)(mpscintr_base + MPSC_INTR_CAUSE), 0);
 154         out_le32((u32 *)(mpscintr_base + MPSC_INTR_MASK), 0);
 155         out_le32((u32 *)(mpscintr_base + MPSC_INTR_MASK), 0);
 156
 157         mpsc_stop_dma(sdma_base);
 158
 159         scdp->open = mpsc_open;
 160         scdp->putc = mpsc_putc;
 161         scdp->getc = mpsc_getc;
 162         scdp->tstc = mpsc_tstc;
 163         scdp->close = NULL;
 164
 165         return 0;
 166
 167 err_out:
 168         return -1;
 169 }