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1 | /* OMAP SSI internal interface. |
2 | * | |
3 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. | |
4 | * Copyright (C) 2013 Sebastian Reichel | |
5 | * | |
6 | * Contact: Carlos Chinea <carlos.chinea@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #ifndef __LINUX_HSI_OMAP_SSI_H__ | |
24 | #define __LINUX_HSI_OMAP_SSI_H__ | |
25 | ||
26 | #include <linux/device.h> | |
a1a0bec5 | 27 | #include <linux/module.h> |
b209e047 SR |
28 | #include <linux/platform_device.h> |
29 | #include <linux/hsi/hsi.h> | |
73e6ce09 | 30 | #include <linux/gpio/consumer.h> |
b209e047 SR |
31 | #include <linux/interrupt.h> |
32 | #include <linux/io.h> | |
33 | ||
34 | #define SSI_MAX_CHANNELS 8 | |
35 | #define SSI_MAX_GDD_LCH 8 | |
36 | #define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) | |
37 | ||
38 | /** | |
39 | * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context | |
40 | * @mode: Bit transmission mode | |
41 | * @channels: Number of channels | |
42 | * @framesize: Frame size in bits | |
43 | * @timeout: RX frame timeout | |
44 | * @divisor: TX divider | |
45 | * @arb_mode: Arbitration mode for TX frame (Round robin, priority) | |
46 | */ | |
47 | struct omap_ssm_ctx { | |
48 | u32 mode; | |
49 | u32 channels; | |
50 | u32 frame_size; | |
51 | union { | |
52 | u32 timeout; /* Rx Only */ | |
53 | struct { | |
54 | u32 arb_mode; | |
55 | u32 divisor; | |
56 | }; /* Tx only */ | |
57 | }; | |
58 | }; | |
59 | ||
60 | /** | |
61 | * struct omap_ssi_port - OMAP SSI port data | |
62 | * @dev: device associated to the port (HSI port) | |
63 | * @pdev: platform device associated to the port | |
64 | * @sst_dma: SSI transmitter physical base address | |
65 | * @ssr_dma: SSI receiver physical base address | |
66 | * @sst_base: SSI transmitter base address | |
67 | * @ssr_base: SSI receiver base address | |
68 | * @wk_lock: spin lock to serialize access to the wake lines | |
69 | * @lock: Spin lock to serialize access to the SSI port | |
70 | * @channels: Current number of channels configured (1,2,4 or 8) | |
71 | * @txqueue: TX message queues | |
72 | * @rxqueue: RX message queues | |
73 | * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode) | |
74 | * @irq: IRQ number | |
75 | * @wake_irq: IRQ number for incoming wake line (-1 if none) | |
76 | * @wake_gpio: GPIO number for incoming wake line (-1 if none) | |
77 | * @pio_tasklet: Bottom half for PIO transfers and events | |
78 | * @wake_tasklet: Bottom half for incoming wake events | |
79 | * @wkin_cken: Keep track of clock references due to the incoming wake line | |
80 | * @wk_refcount: Reference count for output wake line | |
81 | * @sys_mpu_enable: Context for the interrupt enable register for irq 0 | |
82 | * @sst: Context for the synchronous serial transmitter | |
83 | * @ssr: Context for the synchronous serial receiver | |
84 | */ | |
85 | struct omap_ssi_port { | |
86 | struct device *dev; | |
87 | struct device *pdev; | |
88 | dma_addr_t sst_dma; | |
89 | dma_addr_t ssr_dma; | |
90 | void __iomem *sst_base; | |
91 | void __iomem *ssr_base; | |
92 | spinlock_t wk_lock; | |
93 | spinlock_t lock; | |
94 | unsigned int channels; | |
95 | struct list_head txqueue[SSI_MAX_CHANNELS]; | |
96 | struct list_head rxqueue[SSI_MAX_CHANNELS]; | |
97 | struct list_head brkqueue; | |
98 | unsigned int irq; | |
99 | int wake_irq; | |
73e6ce09 | 100 | struct gpio_desc *wake_gpio; |
b209e047 SR |
101 | struct tasklet_struct pio_tasklet; |
102 | struct tasklet_struct wake_tasklet; | |
103 | bool wktest:1; /* FIXME: HACK to be removed */ | |
104 | bool wkin_cken:1; /* Workaround */ | |
105 | unsigned int wk_refcount; | |
106 | /* OMAP SSI port context */ | |
107 | u32 sys_mpu_enable; /* We use only one irq */ | |
108 | struct omap_ssm_ctx sst; | |
109 | struct omap_ssm_ctx ssr; | |
110 | u32 loss_count; | |
111 | u32 port_id; | |
112 | #ifdef CONFIG_DEBUG_FS | |
113 | struct dentry *dir; | |
114 | #endif | |
115 | }; | |
116 | ||
117 | /** | |
118 | * struct gdd_trn - GDD transaction data | |
119 | * @msg: Pointer to the HSI message being served | |
120 | * @sg: Pointer to the current sg entry being served | |
121 | */ | |
122 | struct gdd_trn { | |
123 | struct hsi_msg *msg; | |
124 | struct scatterlist *sg; | |
125 | }; | |
126 | ||
127 | /** | |
128 | * struct omap_ssi_controller - OMAP SSI controller data | |
129 | * @dev: device associated to the controller (HSI controller) | |
130 | * @sys: SSI I/O base address | |
131 | * @gdd: GDD I/O base address | |
132 | * @fck: SSI functional clock | |
133 | * @gdd_irq: IRQ line for GDD | |
134 | * @gdd_tasklet: bottom half for DMA transfers | |
135 | * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers | |
136 | * @lock: lock to serialize access to GDD | |
4bcf7414 SR |
137 | * @fck_nb: DVFS notfifier block |
138 | * @fck_rate: clock rate | |
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139 | * @loss_count: To follow if we need to restore context or not |
140 | * @max_speed: Maximum TX speed (Kb/s) set by the clients. | |
141 | * @sysconfig: SSI controller saved context | |
142 | * @gdd_gcr: SSI GDD saved context | |
143 | * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any | |
144 | * @port: Array of pointers of the ports of the controller | |
145 | * @dir: Debugfs SSI root directory | |
146 | */ | |
147 | struct omap_ssi_controller { | |
148 | struct device *dev; | |
149 | void __iomem *sys; | |
150 | void __iomem *gdd; | |
151 | struct clk *fck; | |
152 | unsigned int gdd_irq; | |
153 | struct tasklet_struct gdd_tasklet; | |
154 | struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH]; | |
155 | spinlock_t lock; | |
4bcf7414 | 156 | struct notifier_block fck_nb; |
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157 | unsigned long fck_rate; |
158 | u32 loss_count; | |
159 | u32 max_speed; | |
160 | /* OMAP SSI Controller context */ | |
161 | u32 sysconfig; | |
162 | u32 gdd_gcr; | |
163 | int (*get_loss)(struct device *dev); | |
164 | struct omap_ssi_port **port; | |
165 | #ifdef CONFIG_DEBUG_FS | |
166 | struct dentry *dir; | |
167 | #endif | |
168 | }; | |
169 | ||
4bcf7414 SR |
170 | void omap_ssi_port_update_fclk(struct hsi_controller *ssi, |
171 | struct omap_ssi_port *omap_port); | |
172 | ||
0fae1989 SR |
173 | extern struct platform_driver ssi_port_pdriver; |
174 | ||
b209e047 | 175 | #endif /* __LINUX_HSI_OMAP_SSI_H__ */ |