1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _NPI_RX_RD32_H 27 #define _NPI_RX_RD32_H 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 #include <npi.h> 34 35 static uint32_t RXDMA_REG_READ32(npi_handle_t, uint32_t, int); 36 #pragma inline(RXDMA_REG_READ32) 37 38 /* 39 * RXDMA_REG_READ32 40 * 41 * Read a 32-bit value from a DMC register. 42 * 43 * Arguments: 44 * handle The NPI handle to use. 45 * offset The offset into the DMA CSR (the register). 46 * channel The channel, which is used as a multiplicand. 47 * 48 * Notes: 49 * If handle.regp is a virtual address (the address of a VR), 50 * we have to subtract the value DMC right off the bat. DMC 51 * is defined as 0x600000, which works in a non-virtual address 52 * space, but not in a VR. In a VR, a DMA CSR's space begins 53 * at zero (0). So, since every call to RXMDA_REG_READ32 uses 54 * a register macro which adds in DMC, we have to subtract it. 55 * 56 * The rest of it is pretty straighforward. In a VR, a channel is 57 * logical, not absolute; and every DMA CSR is 512 bytes big; 58 * furthermore, a subpage of a VR is always ordered with the 59 * transmit CSRs first, followed by the receive CSRs. That is, 60 * a 512 byte space of Tx CSRs, followed by a 512 byte space of 61 * Rx CSRs. Hence this calculation: 62 * 63 * offset += ((channel << 1) + 1) << DMA_CSR_SLL; 64 * 65 * Here's an example: 66 * 67 * RXDMA_REG_READ32(handle, RX_DMA_CTL_STAT_REG, channel); 68 * Let's say channel is 3 69 * #define RX_DMA_CTL_STAT_REG (DMC + 0x00070) 70 * offset = 0x600070 71 * offset &= 0xff = 0x70 72 * offset += ((3 << 1) + 1) << 9 73 * 3 << 1 = 6 74 * 6 + 1 = 7 75 * 7 << 9 = 0xe00 76 * offset += 0xe00 = 0xe70 77 * 78 * Therefore, our register's (virtual) PIO address is 0xe70. 79 * 80 * cf. Table 10-6 on page 181 of the Neptune PRM, v 1.4: 81 * 82 * E00 - FFF CSRs for bound logical receive DMA channel 3. 83 * 84 * In a non-virtual environment, you simply multiply the absolute 85 * channel number by 512 bytes, and get the correct offset to 86 * the register you're looking for. That is, the RX_DMA_CTL_STAT CSR, 87 * is, as are all of these registers, in a table where each channel 88 * is offset 512 bytes from the previous channel (count 16 step 512). 89 * 90 * offset += (channel << DMA_CSR_SLL); // channel<<9 = channel*512 91 * 92 * Here's an example: 93 * 94 * RXDMA_REG_READ32(handle, RX_DMA_CTL_STAT_REG, channel); 95 * Let's say channel is 3 96 * #define RX_DMA_CTL_STAT_REG (DMC + 0x00070) 97 * offset = 0x600070 98 * offset += (3 << 9) 99 * 3 << 9 = 0x600 100 * offset += 0x600 = 0x600670 101 * 102 * Therefore, our register's PIO address is 0x600670. 103 * 104 * cf. Table 12-42 on page 234 of the Neptune PRM, v 1.4: 105 * RX_DMA_CTL_STAT (DMC + [0x]00070) (count 16 step [0x]200) 106 * 107 * Context: 108 * Guest domain 109 * 110 */ 111 uint32_t 112 RXDMA_REG_READ32( 113 npi_handle_t handle, 114 uint32_t offset, 115 int channel) 116 { 117 if (handle.is_vraddr) { 118 offset &= DMA_CSR_MASK; 119 offset += (((channel << 1) + 1) << DMA_CSR_SLL); 120 } else { 121 offset += (channel << DMA_CSR_SLL); 122 } 123 124 return (ddi_get32(handle.regh, (uint32_t *)(handle.regp + offset))); 125 } 126 127 #ifdef __cplusplus 128 } 129 #endif 130 131 #endif /* _NPI_RX_RD32_H */ 132