aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/boot
diff options
context:
space:
mode:
authorScott Wood <scottwood@freescale.com>2007-08-20 13:39:57 -0400
committerPaul Mackerras <paulus@samba.org>2007-08-22 01:26:20 -0400
commitd0f53fafc016b3f4f20f63ecf52f6df8774bcb3c (patch)
treea02ad704dc8fce31942e3414f868b9d14132f16d /arch/powerpc/boot
parent3ee9b7abafc36a9377af6f036f50c3450954884c (diff)
[POWERPC] bootwrapper: Add CPM serial driver
This serial port is used on all 8xx, many 82xx, and some 85xx chips. The driver requires that the port has already been set up by the firmware and/or platform code. Signed-off-by: Scott Wood <scottwood@freescale.com> Acked-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/boot')
-rw-r--r--arch/powerpc/boot/Makefile3
-rw-r--r--arch/powerpc/boot/cpm-serial.c249
-rw-r--r--arch/powerpc/boot/ops.h1
-rw-r--r--arch/powerpc/boot/serial.c5
4 files changed, 257 insertions, 1 deletions
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 54a72108bcc3..075f961db12f 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -44,7 +44,8 @@ $(addprefix $(obj)/,$(zlib) gunzip_util.o main.o): \
44src-wlib := string.S crt0.S stdio.c main.c flatdevtree.c flatdevtree_misc.c \ 44src-wlib := string.S crt0.S stdio.c main.c flatdevtree.c flatdevtree_misc.c \
45 ns16550.c serial.c simple_alloc.c div64.S util.S \ 45 ns16550.c serial.c simple_alloc.c div64.S util.S \
46 gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \ 46 gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \
47 4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c 47 4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c \
48 cpm-serial.c
48src-plat := of.c cuboot-83xx.c cuboot-85xx.c holly.c \ 49src-plat := of.c cuboot-83xx.c cuboot-85xx.c holly.c \
49 cuboot-ebony.c treeboot-ebony.c prpmc2800.c \ 50 cuboot-ebony.c treeboot-ebony.c prpmc2800.c \
50 ps3-head.S ps3-hvcall.S ps3.c treeboot-bamboo.c 51 ps3-head.S ps3-hvcall.S ps3.c treeboot-bamboo.c
diff --git a/arch/powerpc/boot/cpm-serial.c b/arch/powerpc/boot/cpm-serial.c
new file mode 100644
index 000000000000..fcb8b5e956bd
--- /dev/null
+++ b/arch/powerpc/boot/cpm-serial.c
@@ -0,0 +1,249 @@
1/*
2 * CPM serial console support.
3 *
4 * Copyright 2007 Freescale Semiconductor, Inc.
5 * Author: Scott Wood <scottwood@freescale.com>
6 *
7 * It is assumed that the firmware (or the platform file) has already set
8 * up the port.
9 */
10
11#include "types.h"
12#include "io.h"
13#include "ops.h"
14
15struct cpm_scc {
16 u32 gsmrl;
17 u32 gsmrh;
18 u16 psmr;
19 u8 res1[2];
20 u16 todr;
21 u16 dsr;
22 u16 scce;
23 u8 res2[2];
24 u16 sccm;
25 u8 res3;
26 u8 sccs;
27 u8 res4[8];
28};
29
30struct cpm_smc {
31 u8 res1[2];
32 u16 smcmr;
33 u8 res2[2];
34 u8 smce;
35 u8 res3[3];
36 u8 smcm;
37 u8 res4[5];
38};
39
40struct cpm_param {
41 u16 rbase;
42 u16 tbase;
43 u8 rfcr;
44 u8 tfcr;
45};
46
47struct cpm_bd {
48 u16 sc; /* Status and Control */
49 u16 len; /* Data length in buffer */
50 u8 *addr; /* Buffer address in host memory */
51};
52
53static void *cpcr;
54static struct cpm_param *param;
55static struct cpm_smc *smc;
56static struct cpm_scc *scc;
57struct cpm_bd *tbdf, *rbdf;
58static u32 cpm_cmd;
59static u8 *dpram_start;
60
61static void (*do_cmd)(int op);
62static void (*enable_port)(void);
63static void (*disable_port)(void);
64
65#define CPM_CMD_STOP_TX 4
66#define CPM_CMD_RESTART_TX 6
67#define CPM_CMD_INIT_RX_TX 0
68
69static void cpm1_cmd(int op)
70{
71 while (in_be16(cpcr) & 1)
72 ;
73
74 out_be16(cpcr, (op << 8) | cpm_cmd | 1);
75
76 while (in_be16(cpcr) & 1)
77 ;
78}
79
80static void cpm2_cmd(int op)
81{
82 while (in_be32(cpcr) & 0x10000)
83 ;
84
85 out_be32(cpcr, op | cpm_cmd | 0x10000);
86
87 while (in_be32(cpcr) & 0x10000)
88 ;
89}
90
91static void smc_disable_port(void)
92{
93 do_cmd(CPM_CMD_STOP_TX);
94 out_be16(&smc->smcmr, in_be16(&smc->smcmr) & ~3);
95}
96
97static void scc_disable_port(void)
98{
99 do_cmd(CPM_CMD_STOP_TX);
100 out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) & ~0x30);
101}
102
103static void smc_enable_port(void)
104{
105 out_be16(&smc->smcmr, in_be16(&smc->smcmr) | 3);
106 do_cmd(CPM_CMD_RESTART_TX);
107}
108
109static void scc_enable_port(void)
110{
111 out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) | 0x30);
112 do_cmd(CPM_CMD_RESTART_TX);
113}
114
115static int cpm_serial_open(void)
116{
117 int dpaddr = 0x800;
118 disable_port();
119
120 out_8(&param->rfcr, 0x10);
121 out_8(&param->tfcr, 0x10);
122
123 rbdf = (struct cpm_bd *)(dpram_start + dpaddr);
124 rbdf->addr = (u8 *)(rbdf + 2);
125 rbdf->sc = 0xa000;
126 rbdf->len = 1;
127
128 tbdf = rbdf + 1;
129 tbdf->addr = (u8 *)(rbdf + 2) + 1;
130 tbdf->sc = 0x2000;
131 tbdf->len = 1;
132
133 sync();
134 out_be16(&param->rbase, dpaddr);
135 out_be16(&param->tbase, dpaddr + sizeof(struct cpm_bd));
136
137 do_cmd(CPM_CMD_INIT_RX_TX);
138
139 enable_port();
140 return 0;
141}
142
143static void cpm_serial_putc(unsigned char c)
144{
145 while (tbdf->sc & 0x8000)
146 barrier();
147
148 sync();
149
150 tbdf->addr[0] = c;
151 eieio();
152 tbdf->sc |= 0x8000;
153}
154
155static unsigned char cpm_serial_tstc(void)
156{
157 barrier();
158 return !(rbdf->sc & 0x8000);
159}
160
161static unsigned char cpm_serial_getc(void)
162{
163 unsigned char c;
164
165 while (!cpm_serial_tstc())
166 ;
167
168 sync();
169 c = rbdf->addr[0];
170 eieio();
171 rbdf->sc |= 0x8000;
172
173 return c;
174}
175
176int cpm_console_init(void *devp, struct serial_console_data *scdp)
177{
178 void *reg_virt[2];
179 int is_smc = 0, is_cpm2 = 0, n;
180 unsigned long reg_phys;
181 void *parent;
182
183 if (dt_is_compatible(devp, "fsl,cpm1-smc-uart")) {
184 is_smc = 1;
185 } else if (dt_is_compatible(devp, "fsl,cpm2-scc-uart")) {
186 is_cpm2 = 1;
187 } else if (dt_is_compatible(devp, "fsl,cpm2-smc-uart")) {
188 is_cpm2 = 1;
189 is_smc = 1;
190 }
191
192 if (is_smc) {
193 enable_port = smc_enable_port;
194 disable_port = smc_disable_port;
195 } else {
196 enable_port = scc_enable_port;
197 disable_port = scc_disable_port;
198 }
199
200 if (is_cpm2)
201 do_cmd = cpm2_cmd;
202 else
203 do_cmd = cpm1_cmd;
204
205 n = getprop(devp, "fsl,cpm-command", &cpm_cmd, 4);
206 if (n < 4)
207 return -1;
208
209 n = getprop(devp, "virtual-reg", reg_virt, sizeof(reg_virt));
210 if (n < (int)sizeof(reg_virt)) {
211 for (n = 0; n < 2; n++) {
212 if (!dt_xlate_reg(devp, n, &reg_phys, NULL))
213 return -1;
214
215 reg_virt[n] = (void *)reg_phys;
216 }
217 }
218
219 if (is_smc)
220 smc = reg_virt[0];
221 else
222 scc = reg_virt[0];
223
224 param = reg_virt[1];
225
226 parent = get_parent(devp);
227 if (!parent)
228 return -1;
229
230 n = getprop(parent, "virtual-reg", reg_virt, sizeof(reg_virt));
231 if (n < (int)sizeof(reg_virt)) {
232 for (n = 0; n < 2; n++) {
233 if (!dt_xlate_reg(parent, n, &reg_phys, NULL))
234 return -1;
235
236 reg_virt[n] = (void *)reg_phys;
237 }
238 }
239
240 cpcr = reg_virt[0];
241 dpram_start = reg_virt[1];
242
243 scdp->open = cpm_serial_open;
244 scdp->putc = cpm_serial_putc;
245 scdp->getc = cpm_serial_getc;
246 scdp->tstc = cpm_serial_tstc;
247
248 return 0;
249}
diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index e45b364e7fcf..2bc2f02db741 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -82,6 +82,7 @@ int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device);
82int serial_console_init(void); 82int serial_console_init(void);
83int ns16550_console_init(void *devp, struct serial_console_data *scdp); 83int ns16550_console_init(void *devp, struct serial_console_data *scdp);
84int mpsc_console_init(void *devp, struct serial_console_data *scdp); 84int mpsc_console_init(void *devp, struct serial_console_data *scdp);
85int cpm_console_init(void *devp, struct serial_console_data *scdp);
85void *simple_alloc_init(char *base, unsigned long heap_size, 86void *simple_alloc_init(char *base, unsigned long heap_size,
86 unsigned long granularity, unsigned long max_allocs); 87 unsigned long granularity, unsigned long max_allocs);
87extern void flush_cache(void *, unsigned long); 88extern void flush_cache(void *, unsigned long);
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index 944f0ee5bc0f..d47f8e0b4b81 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -121,6 +121,11 @@ int serial_console_init(void)
121 rc = ns16550_console_init(devp, &serial_cd); 121 rc = ns16550_console_init(devp, &serial_cd);
122 else if (dt_is_compatible(devp, "marvell,mpsc")) 122 else if (dt_is_compatible(devp, "marvell,mpsc"))
123 rc = mpsc_console_init(devp, &serial_cd); 123 rc = mpsc_console_init(devp, &serial_cd);
124 else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
125 dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
126 dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
127 dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
128 rc = cpm_console_init(devp, &serial_cd);
124 129
125 /* Add other serial console driver calls here */ 130 /* Add other serial console driver calls here */
126 131