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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-11-11 01:24:53 -0500
committerPaul Mackerras <paulus@samba.org>2006-12-04 00:08:25 -0500
commit4c75a6f441cdd1c69a6c173bc7944e12c2ba6f84 (patch)
tree260e01e5cbd46d335a3d44b60c34dee51e053774
parent69108cf00679716bcab58acb3135390654c5bb99 (diff)
[POWERPC] Generic DCR infrastructure
This patch adds new dcr_map/dcr_read/dcr_write accessors for DCRs that can be used by drivers to transparently address either native DCRs or memory mapped DCRs. The implementation for memory mapped DCRs is done after the binding being currently worked on for SLOF and the Axon chipset. This patch enables it for the cell native platform Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/Kconfig16
-rw-r--r--arch/powerpc/kernel/Makefile1
-rw-r--r--arch/powerpc/sysdev/Makefile3
-rw-r--r--arch/powerpc/sysdev/dcr-low.S39
-rw-r--r--arch/powerpc/sysdev/dcr.c137
-rw-r--r--arch/ppc/Kconfig11
-rw-r--r--include/asm-powerpc/dcr-mmio.h51
-rw-r--r--include/asm-powerpc/dcr-native.h39
-rw-r--r--include/asm-powerpc/dcr.h42
9 files changed, 337 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 96316c866107..0e564d30fc46 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -160,9 +160,11 @@ config PPC_86xx
160 160
161config 40x 161config 40x
162 bool "AMCC 40x" 162 bool "AMCC 40x"
163 select PPC_DCR_NATIVE
163 164
164config 44x 165config 44x
165 bool "AMCC 44x" 166 bool "AMCC 44x"
167 select PPC_DCR_NATIVE
166 168
167config 8xx 169config 8xx
168 bool "Freescale 8xx" 170 bool "Freescale 8xx"
@@ -208,6 +210,19 @@ config PPC_FPU
208 bool 210 bool
209 default y if PPC64 211 default y if PPC64
210 212
213config PPC_DCR_NATIVE
214 bool
215 default n
216
217config PPC_DCR_MMIO
218 bool
219 default n
220
221config PPC_DCR
222 bool
223 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
224 default y
225
211config BOOKE 226config BOOKE
212 bool 227 bool
213 depends on E200 || E500 228 depends on E200 || E500
@@ -453,6 +468,7 @@ config PPC_CELL
453config PPC_CELL_NATIVE 468config PPC_CELL_NATIVE
454 bool 469 bool
455 select PPC_CELL 470 select PPC_CELL
471 select PPC_DCR_MMIO
456 default n 472 default n
457 473
458config PPC_IBM_CELL_BLADE 474config PPC_IBM_CELL_BLADE
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index d8240ce22120..f34d158b9628 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o
58obj-$(CONFIG_SMP) += smp.o 58obj-$(CONFIG_SMP) += smp.o
59obj-$(CONFIG_KPROBES) += kprobes.o 59obj-$(CONFIG_KPROBES) += kprobes.o
60obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o 60obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o
61
61module-$(CONFIG_PPC64) += module_64.o 62module-$(CONFIG_PPC64) += module_64.o
62obj-$(CONFIG_MODULES) += $(module-y) 63obj-$(CONFIG_MODULES) += $(module-y)
63 64
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 5b87f7b42a1f..8ba11ab5e614 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -5,8 +5,7 @@ endif
5obj-$(CONFIG_MPIC) += mpic.o 5obj-$(CONFIG_MPIC) += mpic.o
6obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o 6obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
7obj-$(CONFIG_PPC_MPC106) += grackle.o 7obj-$(CONFIG_PPC_MPC106) += grackle.o
8obj-$(CONFIG_BOOKE) += dcr.o 8obj-$(CONFIG_PPC_DCR) += dcr.o dcr-low.o
9obj-$(CONFIG_40x) += dcr.o
10obj-$(CONFIG_U3_DART) += dart_iommu.o 9obj-$(CONFIG_U3_DART) += dart_iommu.o
11obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o 10obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o
12obj-$(CONFIG_FSL_SOC) += fsl_soc.o 11obj-$(CONFIG_FSL_SOC) += fsl_soc.o
diff --git a/arch/powerpc/sysdev/dcr-low.S b/arch/powerpc/sysdev/dcr-low.S
new file mode 100644
index 000000000000..2078f39e2f17
--- /dev/null
+++ b/arch/powerpc/sysdev/dcr-low.S
@@ -0,0 +1,39 @@
1/*
2 * "Indirect" DCR access
3 *
4 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <asm/ppc_asm.h>
13#include <asm/processor.h>
14
15#define DCR_ACCESS_PROLOG(table) \
16 rlwinm r3,r3,4,18,27; \
17 lis r5,table@h; \
18 ori r5,r5,table@l; \
19 add r3,r3,r5; \
20 mtctr r3; \
21 bctr
22
23_GLOBAL(__mfdcr)
24 DCR_ACCESS_PROLOG(__mfdcr_table)
25
26_GLOBAL(__mtdcr)
27 DCR_ACCESS_PROLOG(__mtdcr_table)
28
29__mfdcr_table:
30 mfdcr r3,0; blr
31__mtdcr_table:
32 mtdcr 0,r4; blr
33
34dcr = 1
35 .rept 1023
36 mfdcr r3,dcr; blr
37 mtdcr dcr,r4; blr
38 dcr = dcr + 1
39 .endr
diff --git a/arch/powerpc/sysdev/dcr.c b/arch/powerpc/sysdev/dcr.c
new file mode 100644
index 000000000000..dffeeaeca1d9
--- /dev/null
+++ b/arch/powerpc/sysdev/dcr.c
@@ -0,0 +1,137 @@
1/*
2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#undef DEBUG
21
22#include <linux/kernel.h>
23#include <asm/prom.h>
24#include <asm/dcr.h>
25
26unsigned int dcr_resource_start(struct device_node *np, unsigned int index)
27{
28 unsigned int ds;
29 const u32 *dr = get_property(np, "dcr-reg", &ds);
30
31 if (dr == NULL || ds & 1 || index >= (ds / 8))
32 return 0;
33
34 return dr[index * 2];
35}
36
37unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
38{
39 unsigned int ds;
40 const u32 *dr = get_property(np, "dcr-reg", &ds);
41
42 if (dr == NULL || ds & 1 || index >= (ds / 8))
43 return 0;
44
45 return dr[index * 2 + 1];
46}
47
48#ifndef CONFIG_PPC_DCR_NATIVE
49
50static struct device_node * find_dcr_parent(struct device_node * node)
51{
52 struct device_node *par, *tmp;
53 const u32 *p;
54
55 for (par = of_node_get(node); par;) {
56 if (get_property(par, "dcr-controller", NULL))
57 break;
58 p = get_property(par, "dcr-parent", NULL);
59 tmp = par;
60 if (p == NULL)
61 par = of_get_parent(par);
62 else
63 par = of_find_node_by_phandle(*p);
64 of_node_put(tmp);
65 }
66 return par;
67}
68
69u64 of_translate_dcr_address(struct device_node *dev,
70 unsigned int dcr_n,
71 unsigned int *out_stride)
72{
73 struct device_node *dp;
74 const u32 *p;
75 unsigned int stride;
76 u64 ret;
77
78 dp = find_dcr_parent(dev);
79 if (dp == NULL)
80 return OF_BAD_ADDR;
81
82 /* Stride is not properly defined yet, default to 0x10 for Axon */
83 p = get_property(dp, "dcr-mmio-stride", NULL);
84 stride = (p == NULL) ? 0x10 : *p;
85
86 /* XXX FIXME: Which property name is to use of the 2 following ? */
87 p = get_property(dp, "dcr-mmio-range", NULL);
88 if (p == NULL)
89 p = get_property(dp, "dcr-mmio-space", NULL);
90 if (p == NULL)
91 return OF_BAD_ADDR;
92
93 /* Maybe could do some better range checking here */
94 ret = of_translate_address(dp, p);
95 if (ret != OF_BAD_ADDR)
96 ret += (u64)(stride) * (u64)dcr_n;
97 if (out_stride)
98 *out_stride = stride;
99 return ret;
100}
101
102dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
103 unsigned int dcr_c)
104{
105 dcr_host_t ret = { .token = NULL, .stride = 0 };
106 u64 addr;
107
108 pr_debug("dcr_map(%s, 0x%x, 0x%x)\n",
109 dev->full_name, dcr_n, dcr_c);
110
111 addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
112 pr_debug("translates to addr: 0x%lx, stride: 0x%x\n",
113 addr, ret.stride);
114 if (addr == OF_BAD_ADDR)
115 return ret;
116 pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
117 ret.token = ioremap(addr, dcr_c * ret.stride);
118 if (ret.token == NULL)
119 return ret;
120 pr_debug("mapped at 0x%p -> base is 0x%p\n",
121 ret.token, ret.token - dcr_n * ret.stride);
122 ret.token -= dcr_n * ret.stride;
123 return ret;
124}
125
126void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
127{
128 dcr_host_t h = host;
129
130 if (h.token == NULL)
131 return;
132 h.token -= dcr_n * h.stride;
133 iounmap(h.token);
134 h.token = NULL;
135}
136
137#endif /* !defined(CONFIG_PPC_DCR_NATIVE) */
diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index ef018e25fb07..edf71a4ecc95 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -77,9 +77,11 @@ config 6xx
77 77
78config 40x 78config 40x
79 bool "40x" 79 bool "40x"
80 select PPC_DCR_NATIVE
80 81
81config 44x 82config 44x
82 bool "44x" 83 bool "44x"
84 select PPC_DCR_NATIVE
83 85
84config 8xx 86config 8xx
85 bool "8xx" 87 bool "8xx"
@@ -95,6 +97,15 @@ endchoice
95config PPC_FPU 97config PPC_FPU
96 bool 98 bool
97 99
100config PPC_DCR_NATIVE
101 bool
102 default n
103
104config PPC_DCR
105 bool
106 depends on PPC_DCR_NATIVE
107 default y
108
98config BOOKE 109config BOOKE
99 bool 110 bool
100 depends on E200 || E500 111 depends on E200 || E500
diff --git a/include/asm-powerpc/dcr-mmio.h b/include/asm-powerpc/dcr-mmio.h
new file mode 100644
index 000000000000..5dbfca8dde36
--- /dev/null
+++ b/include/asm-powerpc/dcr-mmio.h
@@ -0,0 +1,51 @@
1/*
2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#ifndef _ASM_POWERPC_DCR_MMIO_H
21#define _ASM_POWERPC_DCR_MMIO_H
22#ifdef __KERNEL__
23
24#include <asm/io.h>
25
26typedef struct { void __iomem *token; unsigned int stride; } dcr_host_t;
27
28#define DCR_MAP_OK(host) ((host).token != NULL)
29
30extern dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
31 unsigned int dcr_c);
32extern void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c);
33
34static inline u32 dcr_read(dcr_host_t host, unsigned int dcr_n)
35{
36 return in_be32(host.token + dcr_n * host.stride);
37}
38
39static inline void dcr_write(dcr_host_t host, unsigned int dcr_n, u32 value)
40{
41 out_be32(host.token + dcr_n * host.stride, value);
42}
43
44extern u64 of_translate_dcr_address(struct device_node *dev,
45 unsigned int dcr_n,
46 unsigned int *stride);
47
48#endif /* __KERNEL__ */
49#endif /* _ASM_POWERPC_DCR_MMIO_H */
50
51
diff --git a/include/asm-powerpc/dcr-native.h b/include/asm-powerpc/dcr-native.h
new file mode 100644
index 000000000000..fd4a5f5e33d1
--- /dev/null
+++ b/include/asm-powerpc/dcr-native.h
@@ -0,0 +1,39 @@
1/*
2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#ifndef _ASM_POWERPC_DCR_NATIVE_H
21#define _ASM_POWERPC_DCR_NATIVE_H
22#ifdef __KERNEL__
23
24#include <asm/reg.h>
25
26typedef struct {} dcr_host_t;
27
28#define DCR_MAP_OK(host) (1)
29
30#define dcr_map(dev, dcr_n, dcr_c) {}
31#define dcr_unmap(host, dcr_n, dcr_c) {}
32#define dcr_read(host, dcr_n) mfdcr(dcr_n)
33#define dcr_write(host, dcr_n, value) mtdcr(dcr_n, value)
34
35
36#endif /* __KERNEL__ */
37#endif /* _ASM_POWERPC_DCR_NATIVE_H */
38
39
diff --git a/include/asm-powerpc/dcr.h b/include/asm-powerpc/dcr.h
new file mode 100644
index 000000000000..473f2c7fd892
--- /dev/null
+++ b/include/asm-powerpc/dcr.h
@@ -0,0 +1,42 @@
1/*
2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#ifndef _ASM_POWERPC_DCR_H
21#define _ASM_POWERPC_DCR_H
22#ifdef __KERNEL__
23
24#ifdef CONFIG_PPC_DCR_NATIVE
25#include <asm/dcr-native.h>
26#else
27#include <asm/dcr-mmio.h>
28#endif
29
30/*
31 * On CONFIG_PPC_MERGE, we have additional helpers to read the DCR
32 * base from the device-tree
33 */
34#ifdef CONFIG_PPC_MERGE
35extern unsigned int dcr_resource_start(struct device_node *np,
36 unsigned int index);
37extern unsigned int dcr_resource_len(struct device_node *np,
38 unsigned int index);
39#endif /* CONFIG_PPC_MERGE */
40
41#endif /* __KERNEL__ */
42#endif /* _ASM_POWERPC_DCR_H */