Alexander von Gluck IV
8a06abf132
* Remove from raspberry_pi bootloader (which should die soon) * Change to use new arm device layout * Create arch_mailbox to check arm mailboxes (WIP)
97 lines
2.0 KiB
C++
97 lines
2.0 KiB
C++
/*
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* Copyright 2012 Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Michael Lotz, [email protected]
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* François Revol, [email protected]
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* Alexander von Gluck IV, [email protected]
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*/
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#include "arch_mailbox.h"
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#include <arch_cpu.h>
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#include "bcm2708.h"
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//extern addr_t gPeripheralBase;
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//
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//
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//static inline addr_t
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//convert_mailbox_reg(addr_t reg)
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//{
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// return gPeripheralBase + ARM_CTRL_0_MAILBOX_BASE + reg;
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//}
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//
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//
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//static inline void
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//write_mailbox_reg(addr_t reg, uint32 value)
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//{
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// arch_cpu_memory_write_barrier();
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// *(volatile uint32*)convert_mailbox_reg(reg) = value;
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//}
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//
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//
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//static inline uint32
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//read_mailbox_reg(addr_t reg)
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//{
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// uint32 result = *(volatile uint32*)convert_mailbox_reg(reg);
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// arch_cpu_memory_read_barrier();
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// return result;
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//}
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class ArchMailboxArmBCM2708 : public ArchMailbox {
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public:
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ArchMailboxArmBCM2708(addr_t base)
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:
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ArchMailbox(base) {}
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~ArchMailboxArmBCM2708() {}
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virtual status_t Write(uint8 channel, uint32 value);
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virtual status_t Read(uint8 channel, uint32& value);
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};
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extern "C" ArchMailbox*
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arch_get_mailbox_arm_bcm2708(addr_t base)
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{
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return new ArchMailboxArmBCM2708(base);
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}
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status_t
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ArchMailboxArmBCM2708::Write(uint8 channel, uint32 value)
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{
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// We have to wait for the mailbox to drain if it is marked full.
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//while ((read_mailbox_reg(ARM_MAILBOX_STATUS) & ARM_MAILBOX_FULL) != 0)
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// ;
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//value &= ARM_MAILBOX_DATA_MASK;
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//write_mailbox_reg(ARM_MAILBOX_WRITE, value | channel);
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return B_OK;
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}
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status_t
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ArchMailboxArmBCM2708::Read(uint8 channel, uint32& value)
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{
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//while (true) {
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// // Wait for something to arrive in the mailbox.
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// if ((read_mailbox_reg(ARM_MAILBOX_STATUS) & ARM_MAILBOX_EMPTY) != 0)
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// continue;
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// value = read_mailbox_reg(ARM_MAILBOX_READ);
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// if ((value & ARM_MAILBOX_CHANNEL_MASK) != channel) {
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// // Not for us, retry.
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// continue;
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// }
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// break;
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//}
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//value &= ARM_MAILBOX_DATA_MASK;
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return B_OK;
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}
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