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/kernel.h>
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/platform_device.h>
18 #include <mach/mailbox.h>
19 #include <mach/irqs.h>
21 #define MAILBOX_REVISION 0x000
22 #define MAILBOX_SYSCONFIG 0x010
23 #define MAILBOX_SYSSTATUS 0x014
24 #define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
25 #define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
26 #define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
27 #define MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
28 #define MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
30 #define MAILBOX_IRQ_NEWMSG(u) (1 << (2 * (u)))
31 #define MAILBOX_IRQ_NOTFULL(u) (1 << (2 * (u) + 1))
33 #define MBOX_REG_SIZE 0x120
34 #define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
36 static void __iomem *mbox_base;
38 struct omap_mbox2_fifo {
40 unsigned long fifo_stat;
41 unsigned long msg_stat;
44 struct omap_mbox2_priv {
45 struct omap_mbox2_fifo tx_fifo;
46 struct omap_mbox2_fifo rx_fifo;
47 unsigned long irqenable;
48 unsigned long irqstatus;
51 u32 ctx[MBOX_NR_REGS];
54 static struct clk *mbox_ick_handle;
56 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
57 omap_mbox_type_t irq);
59 static inline unsigned int mbox_read_reg(size_t ofs)
61 return __raw_readl(mbox_base + ofs);
64 static inline void mbox_write_reg(u32 val, size_t ofs)
66 __raw_writel(val, mbox_base + ofs);
69 /* Mailbox H/W preparations */
70 static int omap2_mbox_startup(struct omap_mbox *mbox)
74 mbox_ick_handle = clk_get(NULL, "mailboxes_ick");
75 if (IS_ERR(mbox_ick_handle)) {
76 printk("Could not get mailboxes_ick\n");
79 clk_enable(mbox_ick_handle);
81 l = mbox_read_reg(MAILBOX_REVISION);
82 pr_info("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
84 /* set smart-idle & autoidle */
85 l = mbox_read_reg(MAILBOX_SYSCONFIG);
87 mbox_write_reg(l, MAILBOX_SYSCONFIG);
89 omap2_mbox_enable_irq(mbox, IRQ_RX);
94 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
96 clk_disable(mbox_ick_handle);
97 clk_put(mbox_ick_handle);
100 /* Mailbox FIFO handle functions */
101 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
103 struct omap_mbox2_fifo *fifo =
104 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
105 return (mbox_msg_t) mbox_read_reg(fifo->msg);
108 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
110 struct omap_mbox2_fifo *fifo =
111 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
112 mbox_write_reg(msg, fifo->msg);
115 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
117 struct omap_mbox2_fifo *fifo =
118 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
119 return (mbox_read_reg(fifo->msg_stat) == 0);
122 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
124 struct omap_mbox2_fifo *fifo =
125 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
126 return (mbox_read_reg(fifo->fifo_stat));
129 /* Mailbox IRQ handle functions */
130 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
131 omap_mbox_type_t irq)
133 struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
134 u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
136 l = mbox_read_reg(p->irqenable);
138 mbox_write_reg(l, p->irqenable);
141 static void omap2_mbox_disable_irq(struct omap_mbox *mbox,
142 omap_mbox_type_t irq)
144 struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
145 u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
147 l = mbox_read_reg(p->irqenable);
149 mbox_write_reg(l, p->irqenable);
152 static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
153 omap_mbox_type_t irq)
155 struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
156 u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
158 mbox_write_reg(bit, p->irqstatus);
161 static int omap2_mbox_is_irq(struct omap_mbox *mbox,
162 omap_mbox_type_t irq)
164 struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
165 u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
166 u32 enable = mbox_read_reg(p->irqenable);
167 u32 status = mbox_read_reg(p->irqstatus);
169 return (enable & status & bit);
172 static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
175 struct omap_mbox2_priv *p = mbox->priv;
177 for (i = 0; i < MBOX_NR_REGS; i++) {
178 p->ctx[i] = mbox_read_reg(i * sizeof(u32));
180 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
185 static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
188 struct omap_mbox2_priv *p = mbox->priv;
190 for (i = 0; i < MBOX_NR_REGS; i++) {
191 mbox_write_reg(p->ctx[i], i * sizeof(u32));
193 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
198 static struct omap_mbox_ops omap2_mbox_ops = {
199 .type = OMAP_MBOX_TYPE2,
200 .startup = omap2_mbox_startup,
201 .shutdown = omap2_mbox_shutdown,
202 .fifo_read = omap2_mbox_fifo_read,
203 .fifo_write = omap2_mbox_fifo_write,
204 .fifo_empty = omap2_mbox_fifo_empty,
205 .fifo_full = omap2_mbox_fifo_full,
206 .enable_irq = omap2_mbox_enable_irq,
207 .disable_irq = omap2_mbox_disable_irq,
208 .ack_irq = omap2_mbox_ack_irq,
209 .is_irq = omap2_mbox_is_irq,
210 .save_ctx = omap2_mbox_save_ctx,
211 .restore_ctx = omap2_mbox_restore_ctx,
215 * MAILBOX 0: ARM -> DSP,
216 * MAILBOX 1: ARM <- DSP.
217 * MAILBOX 2: ARM -> IVA,
218 * MAILBOX 3: ARM <- IVA.
221 /* FIXME: the following structs should be filled automatically by the user id */
224 static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
226 .msg = MAILBOX_MESSAGE(0),
227 .fifo_stat = MAILBOX_FIFOSTATUS(0),
230 .msg = MAILBOX_MESSAGE(1),
231 .msg_stat = MAILBOX_MSGSTATUS(1),
233 .irqenable = MAILBOX_IRQENABLE(0),
234 .irqstatus = MAILBOX_IRQSTATUS(0),
235 .notfull_bit = MAILBOX_IRQ_NOTFULL(0),
236 .newmsg_bit = MAILBOX_IRQ_NEWMSG(1),
239 struct omap_mbox mbox_dsp_info = {
241 .ops = &omap2_mbox_ops,
242 .priv = &omap2_mbox_dsp_priv,
244 EXPORT_SYMBOL(mbox_dsp_info);
246 #if defined(CONFIG_ARCH_OMAP2420) /* IVA */
247 static struct omap_mbox2_priv omap2_mbox_iva_priv = {
249 .msg = MAILBOX_MESSAGE(2),
250 .fifo_stat = MAILBOX_FIFOSTATUS(2),
253 .msg = MAILBOX_MESSAGE(3),
254 .msg_stat = MAILBOX_MSGSTATUS(3),
256 .irqenable = MAILBOX_IRQENABLE(3),
257 .irqstatus = MAILBOX_IRQSTATUS(3),
258 .notfull_bit = MAILBOX_IRQ_NOTFULL(2),
259 .newmsg_bit = MAILBOX_IRQ_NEWMSG(3),
262 static struct omap_mbox mbox_iva_info = {
264 .ops = &omap2_mbox_ops,
265 .priv = &omap2_mbox_iva_priv,
269 static int __devinit omap2_mbox_probe(struct platform_device *pdev)
271 struct resource *res;
275 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
276 if (unlikely(!res)) {
277 dev_err(&pdev->dev, "invalid mem resource\n");
280 mbox_base = ioremap(res->start, res->end - res->start);
284 /* DSP or IVA2 IRQ */
285 mbox_dsp_info.irq = platform_get_irq(pdev, 0);
286 if (mbox_dsp_info.irq < 0) {
287 dev_err(&pdev->dev, "invalid irq resource\n");
292 ret = omap_mbox_register(&pdev->dev, &mbox_dsp_info);
296 #if defined(CONFIG_ARCH_OMAP2420) /* IVA */
297 if (cpu_is_omap2420()) {
299 res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
300 if (unlikely(!res)) {
301 dev_err(&pdev->dev, "invalid irq resource\n");
305 mbox_iva_info.irq = res->start;
306 ret = omap_mbox_register(&pdev->dev, &mbox_iva_info);
314 omap_mbox_unregister(&mbox_dsp_info);
320 static int __devexit omap2_mbox_remove(struct platform_device *pdev)
322 #if defined(CONFIG_ARCH_OMAP2420)
323 omap_mbox_unregister(&mbox_iva_info);
325 omap_mbox_unregister(&mbox_dsp_info);
330 static struct platform_driver omap2_mbox_driver = {
331 .probe = omap2_mbox_probe,
332 .remove = __devexit_p(omap2_mbox_remove),
334 .name = "omap2-mailbox",
338 static int __init omap2_mbox_init(void)
340 return platform_driver_register(&omap2_mbox_driver);
343 static void __exit omap2_mbox_exit(void)
345 platform_driver_unregister(&omap2_mbox_driver);
348 module_init(omap2_mbox_init);
349 module_exit(omap2_mbox_exit);
351 MODULE_LICENSE("GPL v2");
352 MODULE_DESCRIPTION("omap mailbox: omap2/3 architecture specific functions");
353 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>, Paul Mundt");
354 MODULE_ALIAS("platform:omap2-mailbox");