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
mpsc_open(void)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
mpsc_putc(unsigned char c)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
mpsc_getc(void)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
mpsc_tstc(void)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
mpsc_stop_dma(volatile char * sdma_base)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
mpsc_get_virtreg_of_phandle(void * devp,char * prop)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
mpsc_console_init(void * devp,struct serial_console_data * scdp)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 }
170