1 /*
2 * linux/arch/arm/mach-at91/sam9_smc.c
3 *
4 * Copyright (C) 2008 Andrew Victor
5 * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.h>
13 #include <linux/io.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16
17 #include <mach/at91sam9_smc.h>
18
19 #include "sam9_smc.h"
20
21
22 #define AT91_SMC_CS(id, n) (smc_base_addr[id] + ((n) * 0x10))
23
24 static void __iomem *smc_base_addr[2];
25
sam9_smc_cs_write_mode(void __iomem * base,struct sam9_smc_config * config)26 static void sam9_smc_cs_write_mode(void __iomem *base,
27 struct sam9_smc_config *config)
28 {
29 __raw_writel(config->mode
30 | AT91_SMC_TDF_(config->tdf_cycles),
31 base + AT91_SMC_MODE);
32 }
33
sam9_smc_write_mode(int id,int cs,struct sam9_smc_config * config)34 void sam9_smc_write_mode(int id, int cs,
35 struct sam9_smc_config *config)
36 {
37 sam9_smc_cs_write_mode(AT91_SMC_CS(id, cs), config);
38 }
39
sam9_smc_cs_configure(void __iomem * base,struct sam9_smc_config * config)40 static void sam9_smc_cs_configure(void __iomem *base,
41 struct sam9_smc_config *config)
42 {
43
44 /* Setup register */
45 __raw_writel(AT91_SMC_NWESETUP_(config->nwe_setup)
46 | AT91_SMC_NCS_WRSETUP_(config->ncs_write_setup)
47 | AT91_SMC_NRDSETUP_(config->nrd_setup)
48 | AT91_SMC_NCS_RDSETUP_(config->ncs_read_setup),
49 base + AT91_SMC_SETUP);
50
51 /* Pulse register */
52 __raw_writel(AT91_SMC_NWEPULSE_(config->nwe_pulse)
53 | AT91_SMC_NCS_WRPULSE_(config->ncs_write_pulse)
54 | AT91_SMC_NRDPULSE_(config->nrd_pulse)
55 | AT91_SMC_NCS_RDPULSE_(config->ncs_read_pulse),
56 base + AT91_SMC_PULSE);
57
58 /* Cycle register */
59 __raw_writel(AT91_SMC_NWECYCLE_(config->write_cycle)
60 | AT91_SMC_NRDCYCLE_(config->read_cycle),
61 base + AT91_SMC_CYCLE);
62
63 /* Mode register */
64 sam9_smc_cs_write_mode(base, config);
65 }
66
sam9_smc_configure(int id,int cs,struct sam9_smc_config * config)67 void sam9_smc_configure(int id, int cs,
68 struct sam9_smc_config *config)
69 {
70 sam9_smc_cs_configure(AT91_SMC_CS(id, cs), config);
71 }
72
sam9_smc_cs_read_mode(void __iomem * base,struct sam9_smc_config * config)73 static void sam9_smc_cs_read_mode(void __iomem *base,
74 struct sam9_smc_config *config)
75 {
76 u32 val = __raw_readl(base + AT91_SMC_MODE);
77
78 config->mode = (val & ~AT91_SMC_NWECYCLE);
79 config->tdf_cycles = (val & AT91_SMC_NWECYCLE) >> 16 ;
80 }
81
sam9_smc_read_mode(int id,int cs,struct sam9_smc_config * config)82 void sam9_smc_read_mode(int id, int cs,
83 struct sam9_smc_config *config)
84 {
85 sam9_smc_cs_read_mode(AT91_SMC_CS(id, cs), config);
86 }
87
sam9_smc_cs_read(void __iomem * base,struct sam9_smc_config * config)88 static void sam9_smc_cs_read(void __iomem *base,
89 struct sam9_smc_config *config)
90 {
91 u32 val;
92
93 /* Setup register */
94 val = __raw_readl(base + AT91_SMC_SETUP);
95
96 config->nwe_setup = val & AT91_SMC_NWESETUP;
97 config->ncs_write_setup = (val & AT91_SMC_NCS_WRSETUP) >> 8;
98 config->nrd_setup = (val & AT91_SMC_NRDSETUP) >> 16;
99 config->ncs_read_setup = (val & AT91_SMC_NCS_RDSETUP) >> 24;
100
101 /* Pulse register */
102 val = __raw_readl(base + AT91_SMC_PULSE);
103
104 config->nwe_pulse = val & AT91_SMC_NWEPULSE;
105 config->ncs_write_pulse = (val & AT91_SMC_NCS_WRPULSE) >> 8;
106 config->nrd_pulse = (val & AT91_SMC_NRDPULSE) >> 16;
107 config->ncs_read_pulse = (val & AT91_SMC_NCS_RDPULSE) >> 24;
108
109 /* Cycle register */
110 val = __raw_readl(base + AT91_SMC_CYCLE);
111
112 config->write_cycle = val & AT91_SMC_NWECYCLE;
113 config->read_cycle = (val & AT91_SMC_NRDCYCLE) >> 16;
114
115 /* Mode register */
116 sam9_smc_cs_read_mode(base, config);
117 }
118
sam9_smc_read(int id,int cs,struct sam9_smc_config * config)119 void sam9_smc_read(int id, int cs, struct sam9_smc_config *config)
120 {
121 sam9_smc_cs_read(AT91_SMC_CS(id, cs), config);
122 }
123
at91sam9_ioremap_smc(int id,u32 addr)124 void __init at91sam9_ioremap_smc(int id, u32 addr)
125 {
126 if (id > 1) {
127 pr_warn("%s: id > 2\n", __func__);
128 return;
129 }
130 smc_base_addr[id] = ioremap(addr, 512);
131 if (!smc_base_addr[id])
132 pr_warn("Impossible to ioremap smc.%d 0x%x\n", id, addr);
133 }
134