Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 1 | /* |
| 2 | * udbg serial input/output routines for the Marvell MV64x60 (Discovery). |
| 3 | * |
| 4 | * Author: Dale Farnsworth <dale@farnsworth.org> |
| 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 <asm/io.h> |
| 13 | #include <asm/prom.h> |
| 14 | #include <asm/udbg.h> |
| 15 | |
| 16 | #include <sysdev/mv64x60.h> |
| 17 | |
| 18 | #define MPSC_0_CR1_OFFSET 0x000c |
| 19 | |
| 20 | #define MPSC_0_CR2_OFFSET 0x0010 |
| 21 | #define MPSC_CHR_2_TCS (1 << 9) |
| 22 | |
| 23 | #define MPSC_0_CHR_10_OFFSET 0x0030 |
| 24 | |
| 25 | #define MPSC_INTR_CAUSE_OFF_0 0x0004 |
| 26 | #define MPSC_INTR_CAUSE_OFF_1 0x000c |
| 27 | #define MPSC_INTR_CAUSE_RCC (1<<6) |
| 28 | |
| 29 | static void __iomem *mpsc_base; |
| 30 | static void __iomem *mpsc_intr_cause; |
| 31 | |
| 32 | static void mv64x60_udbg_putc(char c) |
| 33 | { |
| 34 | if (c == '\n') |
| 35 | mv64x60_udbg_putc('\r'); |
| 36 | |
| 37 | while(in_le32(mpsc_base + MPSC_0_CR2_OFFSET) & MPSC_CHR_2_TCS) |
| 38 | ; |
| 39 | out_le32(mpsc_base + MPSC_0_CR1_OFFSET, c); |
| 40 | out_le32(mpsc_base + MPSC_0_CR2_OFFSET, MPSC_CHR_2_TCS); |
| 41 | } |
| 42 | |
| 43 | static int mv64x60_udbg_testc(void) |
| 44 | { |
| 45 | return (in_le32(mpsc_intr_cause) & MPSC_INTR_CAUSE_RCC) != 0; |
| 46 | } |
| 47 | |
| 48 | static int mv64x60_udbg_getc(void) |
| 49 | { |
| 50 | int cause = 0; |
| 51 | int c; |
| 52 | |
| 53 | while (!mv64x60_udbg_testc()) |
| 54 | ; |
| 55 | |
| 56 | c = in_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2); |
| 57 | out_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2, c); |
| 58 | out_le32(mpsc_intr_cause, cause & ~MPSC_INTR_CAUSE_RCC); |
| 59 | return c; |
| 60 | } |
| 61 | |
| 62 | static int mv64x60_udbg_getc_poll(void) |
| 63 | { |
| 64 | if (!mv64x60_udbg_testc()) |
| 65 | return -1; |
| 66 | |
| 67 | return mv64x60_udbg_getc(); |
| 68 | } |
| 69 | |
| 70 | static void mv64x60_udbg_init(void) |
| 71 | { |
| 72 | struct device_node *np, *mpscintr, *stdout = NULL; |
| 73 | const char *path; |
| 74 | const phandle *ph; |
| 75 | struct resource r[2]; |
| 76 | const int *block_index; |
| 77 | int intr_cause_offset; |
| 78 | int err; |
| 79 | |
| 80 | path = of_get_property(of_chosen, "linux,stdout-path", NULL); |
| 81 | if (!path) |
| 82 | return; |
| 83 | |
| 84 | stdout = of_find_node_by_path(path); |
| 85 | if (!stdout) |
| 86 | return; |
| 87 | |
Mark A. Greer | a1810b4 | 2008-04-08 08:09:03 +1000 | [diff] [blame] | 88 | for_each_compatible_node(np, "serial", "marvell,mv64360-mpsc") { |
Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 89 | if (np == stdout) |
| 90 | break; |
Cyrill Gorcunov | 26cb7d8 | 2007-11-30 06:44:36 +1100 | [diff] [blame] | 91 | } |
Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 92 | |
| 93 | of_node_put(stdout); |
| 94 | if (!np) |
| 95 | return; |
| 96 | |
Remi Machet | df40a57 | 2008-04-22 07:02:56 +1000 | [diff] [blame] | 97 | block_index = of_get_property(np, "cell-index", NULL); |
Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 98 | if (!block_index) |
| 99 | goto error; |
| 100 | |
| 101 | switch (*block_index) { |
| 102 | case 0: |
| 103 | intr_cause_offset = MPSC_INTR_CAUSE_OFF_0; |
| 104 | break; |
| 105 | case 1: |
| 106 | intr_cause_offset = MPSC_INTR_CAUSE_OFF_1; |
| 107 | break; |
| 108 | default: |
| 109 | goto error; |
| 110 | } |
| 111 | |
| 112 | err = of_address_to_resource(np, 0, &r[0]); |
| 113 | if (err) |
| 114 | goto error; |
| 115 | |
| 116 | ph = of_get_property(np, "mpscintr", NULL); |
| 117 | mpscintr = of_find_node_by_phandle(*ph); |
| 118 | if (!mpscintr) |
| 119 | goto error; |
| 120 | |
| 121 | err = of_address_to_resource(mpscintr, 0, &r[1]); |
| 122 | of_node_put(mpscintr); |
| 123 | if (err) |
| 124 | goto error; |
| 125 | |
| 126 | of_node_put(np); |
| 127 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 128 | mpsc_base = ioremap(r[0].start, resource_size(&r[0])); |
Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 129 | if (!mpsc_base) |
| 130 | return; |
| 131 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 132 | mpsc_intr_cause = ioremap(r[1].start, resource_size(&r[1])); |
Dale Farnsworth | 9b41fcb | 2007-05-15 05:52:22 +1000 | [diff] [blame] | 133 | if (!mpsc_intr_cause) { |
| 134 | iounmap(mpsc_base); |
| 135 | return; |
| 136 | } |
| 137 | mpsc_intr_cause += intr_cause_offset; |
| 138 | |
| 139 | udbg_putc = mv64x60_udbg_putc; |
| 140 | udbg_getc = mv64x60_udbg_getc; |
| 141 | udbg_getc_poll = mv64x60_udbg_getc_poll; |
| 142 | |
| 143 | return; |
| 144 | |
| 145 | error: |
| 146 | of_node_put(np); |
| 147 | } |
| 148 | |
| 149 | void mv64x60_init_early(void) |
| 150 | { |
| 151 | mv64x60_udbg_init(); |
| 152 | } |