2 * Mailbox reservation modules for OMAP2/3
4 * Copyright (C) 2006-2009 Nokia Corporation
5 * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/platform_device.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/platform_data/mailbox-omap.h>
22 #include "omap-mbox.h"
24 #define MAILBOX_REVISION 0x000
25 #define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
26 #define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
27 #define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
28 #define MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
29 #define MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
31 #define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
32 #define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
33 #define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
35 #define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
36 #define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
38 #define MBOX_REG_SIZE 0x120
40 #define OMAP4_MBOX_REG_SIZE 0x130
42 #define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
43 #define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
45 static void __iomem *mbox_base;
47 struct omap_mbox2_fifo {
49 unsigned long fifo_stat;
50 unsigned long msg_stat;
53 struct omap_mbox2_priv {
54 struct omap_mbox2_fifo tx_fifo;
55 struct omap_mbox2_fifo rx_fifo;
56 unsigned long irqenable;
57 unsigned long irqstatus;
60 u32 ctx[OMAP4_MBOX_NR_REGS];
61 unsigned long irqdisable;
65 static inline unsigned int mbox_read_reg(size_t ofs)
67 return __raw_readl(mbox_base + ofs);
70 static inline void mbox_write_reg(u32 val, size_t ofs)
72 __raw_writel(val, mbox_base + ofs);
75 /* Mailbox H/W preparations */
76 static int omap2_mbox_startup(struct omap_mbox *mbox)
80 pm_runtime_enable(mbox->dev->parent);
81 pm_runtime_get_sync(mbox->dev->parent);
83 l = mbox_read_reg(MAILBOX_REVISION);
84 pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
89 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
91 pm_runtime_put_sync(mbox->dev->parent);
92 pm_runtime_disable(mbox->dev->parent);
95 /* Mailbox FIFO handle functions */
96 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
98 struct omap_mbox2_fifo *fifo =
99 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
100 return (mbox_msg_t) mbox_read_reg(fifo->msg);
103 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
105 struct omap_mbox2_fifo *fifo =
106 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
107 mbox_write_reg(msg, fifo->msg);
110 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
112 struct omap_mbox2_fifo *fifo =
113 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
114 return (mbox_read_reg(fifo->msg_stat) == 0);
117 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
119 struct omap_mbox2_fifo *fifo =
120 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
121 return mbox_read_reg(fifo->fifo_stat);
124 /* Mailbox IRQ handle functions */
125 static void omap2_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
127 struct omap_mbox2_priv *p = mbox->priv;
128 u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
130 l = mbox_read_reg(p->irqenable);
132 mbox_write_reg(l, p->irqenable);
135 static void omap2_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
137 struct omap_mbox2_priv *p = mbox->priv;
138 u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
141 * Read and update the interrupt configuration register for pre-OMAP4.
142 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
145 bit = mbox_read_reg(p->irqdisable) & ~bit;
147 mbox_write_reg(bit, p->irqdisable);
150 static void omap2_mbox_ack_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
152 struct omap_mbox2_priv *p = mbox->priv;
153 u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
155 mbox_write_reg(bit, p->irqstatus);
157 /* Flush posted write for irq status to avoid spurious interrupts */
158 mbox_read_reg(p->irqstatus);
161 static int omap2_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
163 struct omap_mbox2_priv *p = mbox->priv;
164 u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
165 u32 enable = mbox_read_reg(p->irqenable);
166 u32 status = mbox_read_reg(p->irqstatus);
168 return (int)(enable & status & bit);
171 static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
174 struct omap_mbox2_priv *p = mbox->priv;
178 nr_regs = OMAP4_MBOX_NR_REGS;
180 nr_regs = MBOX_NR_REGS;
181 for (i = 0; i < nr_regs; i++) {
182 p->ctx[i] = mbox_read_reg(i * sizeof(u32));
184 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
189 static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
192 struct omap_mbox2_priv *p = mbox->priv;
196 nr_regs = OMAP4_MBOX_NR_REGS;
198 nr_regs = MBOX_NR_REGS;
199 for (i = 0; i < nr_regs; i++) {
200 mbox_write_reg(p->ctx[i], i * sizeof(u32));
202 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
207 static struct omap_mbox_ops omap2_mbox_ops = {
208 .type = OMAP_MBOX_TYPE2,
209 .startup = omap2_mbox_startup,
210 .shutdown = omap2_mbox_shutdown,
211 .fifo_read = omap2_mbox_fifo_read,
212 .fifo_write = omap2_mbox_fifo_write,
213 .fifo_empty = omap2_mbox_fifo_empty,
214 .fifo_full = omap2_mbox_fifo_full,
215 .enable_irq = omap2_mbox_enable_irq,
216 .disable_irq = omap2_mbox_disable_irq,
217 .ack_irq = omap2_mbox_ack_irq,
218 .is_irq = omap2_mbox_is_irq,
219 .save_ctx = omap2_mbox_save_ctx,
220 .restore_ctx = omap2_mbox_restore_ctx,
223 static int omap2_mbox_probe(struct platform_device *pdev)
225 struct resource *mem;
227 struct omap_mbox **list, *mbox, *mboxblk;
228 struct omap_mbox2_priv *priv, *privblk;
229 struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
230 struct omap_mbox_dev_info *info;
233 if (!pdata || !pdata->info_cnt || !pdata->info) {
234 pr_err("%s: platform not supported\n", __func__);
238 /* allocate one extra for marking end of list */
239 list = kzalloc((pdata->info_cnt + 1) * sizeof(*list), GFP_KERNEL);
243 mboxblk = mbox = kzalloc(pdata->info_cnt * sizeof(*mbox), GFP_KERNEL);
249 privblk = priv = kzalloc(pdata->info_cnt * sizeof(*priv), GFP_KERNEL);
256 for (i = 0; i < pdata->info_cnt; i++, info++, priv++) {
257 priv->tx_fifo.msg = MAILBOX_MESSAGE(info->tx_id);
258 priv->tx_fifo.fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
259 priv->rx_fifo.msg = MAILBOX_MESSAGE(info->rx_id);
260 priv->rx_fifo.msg_stat = MAILBOX_MSGSTATUS(info->rx_id);
261 priv->notfull_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
262 priv->newmsg_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
263 if (pdata->intr_type) {
264 priv->irqenable = OMAP4_MAILBOX_IRQENABLE(info->usr_id);
265 priv->irqstatus = OMAP4_MAILBOX_IRQSTATUS(info->usr_id);
267 OMAP4_MAILBOX_IRQENABLE_CLR(info->usr_id);
269 priv->irqenable = MAILBOX_IRQENABLE(info->usr_id);
270 priv->irqstatus = MAILBOX_IRQSTATUS(info->usr_id);
271 priv->irqdisable = MAILBOX_IRQENABLE(info->usr_id);
273 priv->intr_type = pdata->intr_type;
276 mbox->name = info->name;
277 mbox->ops = &omap2_mbox_ops;
278 mbox->irq = platform_get_irq(pdev, info->irq_id);
286 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
292 mbox_base = ioremap(mem->start, resource_size(mem));
298 ret = omap_mbox_register(&pdev->dev, list);
301 platform_set_drvdata(pdev, list);
316 static int omap2_mbox_remove(struct platform_device *pdev)
318 struct omap_mbox2_priv *privblk;
319 struct omap_mbox **list = platform_get_drvdata(pdev);
320 struct omap_mbox *mboxblk = list[0];
322 privblk = mboxblk->priv;
323 omap_mbox_unregister();
332 static struct platform_driver omap2_mbox_driver = {
333 .probe = omap2_mbox_probe,
334 .remove = omap2_mbox_remove,
336 .name = "omap-mailbox",
340 static int __init omap2_mbox_init(void)
342 return platform_driver_register(&omap2_mbox_driver);
345 static void __exit omap2_mbox_exit(void)
347 platform_driver_unregister(&omap2_mbox_driver);
350 module_init(omap2_mbox_init);
351 module_exit(omap2_mbox_exit);
353 MODULE_LICENSE("GPL v2");
354 MODULE_DESCRIPTION("omap mailbox: omap2/3/4 architecture specific functions");
355 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
356 MODULE_AUTHOR("Paul Mundt");
357 MODULE_ALIAS("platform:omap2-mailbox");