mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-07 05:34:28 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
143 lines
2.6 KiB
C
143 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016 Google, Inc
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*
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* Modified from coreboot
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/intel_regs.h>
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#include <asm/io.h>
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#include <asm/arch/pch.h>
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#define IOBP_RETRY 1000
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/* IO Buffer Programming */
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#define IOBPIRI 0x2330
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#define IOBPD 0x2334
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#define IOBPS 0x2338
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#define IOBPS_READY 0x0001
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#define IOBPS_TX_MASK 0x0006
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#define IOBPS_MASK 0xff00
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#define IOBPS_READ 0x0600
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#define IOBPS_WRITE 0x0700
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#define IOBPU 0x233a
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#define IOBPU_MAGIC 0xf000
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#define IOBP_PCICFG_READ 0x0400
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#define IOBP_PCICFG_WRITE 0x0500
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static inline int iobp_poll(void)
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{
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unsigned try;
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for (try = IOBP_RETRY; try > 0; try--) {
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u16 status = readw(RCB_REG(IOBPS));
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if ((status & IOBPS_READY) == 0)
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return 1;
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udelay(10);
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}
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printf("IOBP: timeout waiting for transaction to complete\n");
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return 0;
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}
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int pch_iobp_trans_start(u32 address, int op)
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{
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if (!iobp_poll())
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return 0;
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/* Set the address */
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writel(address, RCB_REG(IOBPIRI));
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/* READ OPCODE */
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clrsetbits_le16(RCB_REG(IOBPS), IOBPS_MASK, op);
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return 1;
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}
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int pch_iobp_trans_finish(void)
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{
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u16 status;
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/* Undocumented magic */
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writew(IOBPU_MAGIC, RCB_REG(IOBPU));
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/* Set ready bit */
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setbits_le16(RCB_REG(IOBPS), IOBPS_READY);
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if (!iobp_poll())
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return 1;
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/* Check for successful transaction */
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status = readw(RCB_REG(IOBPS));
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if (status & IOBPS_TX_MASK)
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return 1;
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return 0;
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}
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u32 pch_iobp_read(u32 address)
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{
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if (!pch_iobp_trans_start(address, IOBPS_READ))
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return 0;
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if (pch_iobp_trans_finish()) {
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printf("IOBP: read 0x%08x failed\n", address);
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return 0;
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}
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/* Read IOBP data */
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return readl(RCB_REG(IOBPD));
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}
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int pch_iobp_write(u32 address, u32 data)
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{
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if (!pch_iobp_trans_start(address, IOBPS_WRITE))
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return -EIO;
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writel(data, RCB_REG(IOBPD));
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if (pch_iobp_trans_finish()) {
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printf("IOBP: write 0x%08x failed\n", address);
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return -EIO;
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}
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return 0;
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}
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int pch_iobp_update(u32 address, u32 andvalue, u32 orvalue)
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{
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u32 data = pch_iobp_read(address);
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/* Update the data */
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data &= andvalue;
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data |= orvalue;
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return pch_iobp_write(address, data);
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}
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int pch_iobp_exec(u32 addr, u16 op_code, u8 route_id, u32 *data, u8 *resp)
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{
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if (!data || !resp)
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return 0;
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*resp = -1;
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if (!iobp_poll())
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return -EIO;
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writel(addr, RCB_REG(IOBPIRI));
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clrsetbits_le16(RCB_REG(IOBPS), 0xff00, op_code);
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writew(IOBPU_MAGIC | route_id, RCB_REG(IOBPU));
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writel(*data, RCB_REG(IOBPD));
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/* Set IOBPS[0] to trigger IOBP transaction*/
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setbits_le16(RCB_REG(IOBPS), 1);
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if (!iobp_poll())
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return -EIO;
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*resp = (readw(RCB_REG(IOBPS)) & IOBPS_TX_MASK) >> 1;
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*data = readl(RCB_REG(IOBPD));
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return 0;
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}
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