1/* 2 * Mailbox reservation modules for OMAP1 3 * 4 * Copyright (C) 2006-2009 Nokia Corporation 5 * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com> 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 */ 11 12#include <linux/interrupt.h> 13#include <linux/platform_device.h> 14#include <linux/io.h> 15#include <plat/mailbox.h> 16 17#define MAILBOX_ARM2DSP1 0x00 18#define MAILBOX_ARM2DSP1b 0x04 19#define MAILBOX_DSP2ARM1 0x08 20#define MAILBOX_DSP2ARM1b 0x0c 21#define MAILBOX_DSP2ARM2 0x10 22#define MAILBOX_DSP2ARM2b 0x14 23#define MAILBOX_ARM2DSP1_Flag 0x18 24#define MAILBOX_DSP2ARM1_Flag 0x1c 25#define MAILBOX_DSP2ARM2_Flag 0x20 26 27static void __iomem *mbox_base; 28 29struct omap_mbox1_fifo { 30 unsigned long cmd; 31 unsigned long data; 32 unsigned long flag; 33}; 34 35struct omap_mbox1_priv { 36 struct omap_mbox1_fifo tx_fifo; 37 struct omap_mbox1_fifo rx_fifo; 38}; 39 40static inline int mbox_read_reg(size_t ofs) 41{ 42 return __raw_readw(mbox_base + ofs); 43} 44 45static inline void mbox_write_reg(u32 val, size_t ofs) 46{ 47 __raw_writew(val, mbox_base + ofs); 48} 49 50/* msg */ 51static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox) 52{ 53 struct omap_mbox1_fifo *fifo = 54 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo; 55 mbox_msg_t msg; 56 57 msg = mbox_read_reg(fifo->data); 58 msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16; 59 60 return msg; 61} 62 63static void 64omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg) 65{ 66 struct omap_mbox1_fifo *fifo = 67 &((struct omap_mbox1_priv *)mbox->priv)->tx_fifo; 68 69 mbox_write_reg(msg & 0xffff, fifo->data); 70 mbox_write_reg(msg >> 16, fifo->cmd); 71} 72 73static int omap1_mbox_fifo_empty(struct omap_mbox *mbox) 74{ 75 return 0; 76} 77 78static int omap1_mbox_fifo_full(struct omap_mbox *mbox) 79{ 80 struct omap_mbox1_fifo *fifo = 81 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo; 82 83 return mbox_read_reg(fifo->flag); 84} 85 86/* irq */ 87static void 88omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq) 89{ 90 if (irq == IRQ_RX) 91 enable_irq(mbox->irq); 92} 93 94static void 95omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq) 96{ 97 if (irq == IRQ_RX) 98 disable_irq(mbox->irq); 99} 100 101static int 102omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq) 103{ 104 if (irq == IRQ_TX) 105 return 0; 106 return 1; 107} 108 109static struct omap_mbox_ops omap1_mbox_ops = { 110 .type = OMAP_MBOX_TYPE1, 111 .fifo_read = omap1_mbox_fifo_read, 112 .fifo_write = omap1_mbox_fifo_write, 113 .fifo_empty = omap1_mbox_fifo_empty, 114 .fifo_full = omap1_mbox_fifo_full, 115 .enable_irq = omap1_mbox_enable_irq, 116 .disable_irq = omap1_mbox_disable_irq, 117 .is_irq = omap1_mbox_is_irq, 118}; 119 120 121/* DSP */ 122static struct omap_mbox1_priv omap1_mbox_dsp_priv = { 123 .tx_fifo = { 124 .cmd = MAILBOX_ARM2DSP1b, 125 .data = MAILBOX_ARM2DSP1, 126 .flag = MAILBOX_ARM2DSP1_Flag, 127 }, 128 .rx_fifo = { 129 .cmd = MAILBOX_DSP2ARM1b, 130 .data = MAILBOX_DSP2ARM1, 131 .flag = MAILBOX_DSP2ARM1_Flag, 132 }, 133}; 134 135struct omap_mbox mbox_dsp_info = { 136 .name = "dsp", 137 .ops = &omap1_mbox_ops, 138 .priv = &omap1_mbox_dsp_priv, 139}; 140 141struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL }; 142 143static int __devinit omap1_mbox_probe(struct platform_device *pdev) 144{ 145 struct resource *mem; 146 int ret; 147 int i; 148 struct omap_mbox **list; 149 150 list = omap1_mboxes; 151 list[0]->irq = platform_get_irq_byname(pdev, "dsp"); 152 153 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 154 mbox_base = ioremap(mem->start, resource_size(mem)); 155 if (!mbox_base) 156 return -ENOMEM; 157 158 ret = omap_mbox_register(&pdev->dev, list); 159 if (ret) { 160 iounmap(mbox_base); 161 return ret; 162 } 163 164 return 0; 165} 166 167static int __devexit omap1_mbox_remove(struct platform_device *pdev) 168{ 169 omap_mbox_unregister(); 170 iounmap(mbox_base); 171 return 0; 172} 173 174static struct platform_driver omap1_mbox_driver = { 175 .probe = omap1_mbox_probe, 176 .remove = __devexit_p(omap1_mbox_remove), 177 .driver = { 178 .name = "omap-mailbox", 179 }, 180}; 181 182static int __init omap1_mbox_init(void) 183{ 184 return platform_driver_register(&omap1_mbox_driver); 185} 186 187static void __exit omap1_mbox_exit(void) 188{ 189 platform_driver_unregister(&omap1_mbox_driver); 190} 191 192module_init(omap1_mbox_init); 193module_exit(omap1_mbox_exit); 194 195MODULE_LICENSE("GPL v2"); 196MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions"); 197MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); 198MODULE_ALIAS("platform:omap1-mailbox"); 199