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review.evervolv.com / android_kernel_htc_msm8960 / c853d945d3e0cadf60da03106f7d9bbf1346a518 / . / arch / mips / bcm63xx / cs.c
blob: 50d8190bbf7b25a53400be516392793145946d8f [file] [log] [blame]
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/spinlock.h>
12#include <linux/log2.h>
13#include <bcm63xx_cpu.h>
14#include <bcm63xx_io.h>
15#include <bcm63xx_regs.h>
16#include <bcm63xx_cs.h>
17
18static DEFINE_SPINLOCK(bcm63xx_cs_lock);
19
20/*
21 * check if given chip select exists
22 */
23static int is_valid_cs(unsigned int cs)
24{
25 if (cs > 6)
26 return 0;
27 return 1;
28}
29
30/*
31 * Configure chipselect base address and size (bytes).
32 * Size must be a power of two between 8k and 256M.
33 */
34int bcm63xx_set_cs_base(unsigned int cs, u32 base, unsigned int size)
35{
36 unsigned long flags;
37 u32 val;
38
39 if (!is_valid_cs(cs))
40 return -EINVAL;
41
42 /* sanity check on size */
43 if (size != roundup_pow_of_two(size))
44 return -EINVAL;
45
46 if (size < 8 * 1024 || size > 256 * 1024 * 1024)
47 return -EINVAL;
48
49 val = (base & MPI_CSBASE_BASE_MASK);
50 /* 8k => 0 - 256M => 15 */
51 val |= (ilog2(size) - ilog2(8 * 1024)) << MPI_CSBASE_SIZE_SHIFT;
52
53 spin_lock_irqsave(&bcm63xx_cs_lock, flags);
54 bcm_mpi_writel(val, MPI_CSBASE_REG(cs));
55 spin_unlock_irqrestore(&bcm63xx_cs_lock, flags);
56
57 return 0;
58}
59
60EXPORT_SYMBOL(bcm63xx_set_cs_base);
61
62/*
63 * configure chipselect timing (ns)
64 */
65int bcm63xx_set_cs_timing(unsigned int cs, unsigned int wait,
66 unsigned int setup, unsigned int hold)
67{
68 unsigned long flags;
69 u32 val;
70
71 if (!is_valid_cs(cs))
72 return -EINVAL;
73
74 spin_lock_irqsave(&bcm63xx_cs_lock, flags);
75 val = bcm_mpi_readl(MPI_CSCTL_REG(cs));
76 val &= ~(MPI_CSCTL_WAIT_MASK);
77 val &= ~(MPI_CSCTL_SETUP_MASK);
78 val &= ~(MPI_CSCTL_HOLD_MASK);
79 val |= wait << MPI_CSCTL_WAIT_SHIFT;
80 val |= setup << MPI_CSCTL_SETUP_SHIFT;
81 val |= hold << MPI_CSCTL_HOLD_SHIFT;
82 bcm_mpi_writel(val, MPI_CSCTL_REG(cs));
83 spin_unlock_irqrestore(&bcm63xx_cs_lock, flags);
84
85 return 0;
86}
87
88EXPORT_SYMBOL(bcm63xx_set_cs_timing);
89
90/*
91 * configure other chipselect parameter (data bus size, ...)
92 */
93int bcm63xx_set_cs_param(unsigned int cs, u32 params)
94{
95 unsigned long flags;
96 u32 val;
97
98 if (!is_valid_cs(cs))
99 return -EINVAL;
100
101 /* none of this fields apply to pcmcia */
102 if (cs == MPI_CS_PCMCIA_COMMON ||
103 cs == MPI_CS_PCMCIA_ATTR ||
104 cs == MPI_CS_PCMCIA_IO)
105 return -EINVAL;
106
107 spin_lock_irqsave(&bcm63xx_cs_lock, flags);
108 val = bcm_mpi_readl(MPI_CSCTL_REG(cs));
109 val &= ~(MPI_CSCTL_DATA16_MASK);
110 val &= ~(MPI_CSCTL_SYNCMODE_MASK);
111 val &= ~(MPI_CSCTL_TSIZE_MASK);
112 val &= ~(MPI_CSCTL_ENDIANSWAP_MASK);
113 val |= params;
114 bcm_mpi_writel(val, MPI_CSCTL_REG(cs));
115 spin_unlock_irqrestore(&bcm63xx_cs_lock, flags);
116
117 return 0;
118}
119
120EXPORT_SYMBOL(bcm63xx_set_cs_param);
121
122/*
123 * set cs status (enable/disable)
124 */
125int bcm63xx_set_cs_status(unsigned int cs, int enable)
126{
127 unsigned long flags;
128 u32 val;
129
130 if (!is_valid_cs(cs))
131 return -EINVAL;
132
133 spin_lock_irqsave(&bcm63xx_cs_lock, flags);
134 val = bcm_mpi_readl(MPI_CSCTL_REG(cs));
135 if (enable)
136 val |= MPI_CSCTL_ENABLE_MASK;
137 else
138 val &= ~MPI_CSCTL_ENABLE_MASK;
139 bcm_mpi_writel(val, MPI_CSCTL_REG(cs));
140 spin_unlock_irqrestore(&bcm63xx_cs_lock, flags);
141 return 0;
142}
143
144EXPORT_SYMBOL(bcm63xx_set_cs_status);