mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
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>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Sunxi A31 Power Management Unit
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*
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* (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
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* http://linux-sunxi.org
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*
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* Based on sun6i sources and earlier U-Boot Allwiner A10 SPL work
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*
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* (C) Copyright 2006-2013
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Berg Xing <bergxing@allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/p2wi.h>
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#include <asm/arch/prcm.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/sys_proto.h>
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void p2wi_init(void)
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{
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struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUN6I_P2WI_BASE;
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/* Enable p2wi and PIO clk, and de-assert their resets */
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prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_P2WI);
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sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN6I_GPL0_R_P2WI_SCK);
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sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN6I_GPL1_R_P2WI_SDA);
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/* Reset p2wi controller and set clock to CLKIN(12)/8 = 1.5 MHz */
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writel(P2WI_CTRL_RESET, &p2wi->ctrl);
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sdelay(0x100);
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writel(P2WI_CC_SDA_OUT_DELAY(1) | P2WI_CC_CLK_DIV(8),
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&p2wi->cc);
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}
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int p2wi_change_to_p2wi_mode(u8 slave_addr, u8 ctrl_reg, u8 init_data)
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{
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struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUN6I_P2WI_BASE;
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unsigned long tmo = timer_get_us() + 1000000;
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writel(P2WI_PM_DEV_ADDR(slave_addr) |
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P2WI_PM_CTRL_ADDR(ctrl_reg) |
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P2WI_PM_INIT_DATA(init_data) |
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P2WI_PM_INIT_SEND,
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&p2wi->pm);
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while ((readl(&p2wi->pm) & P2WI_PM_INIT_SEND)) {
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if (timer_get_us() > tmo)
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return -ETIME;
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}
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return 0;
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}
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static int p2wi_await_trans(void)
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{
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struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUN6I_P2WI_BASE;
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unsigned long tmo = timer_get_us() + 1000000;
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int ret;
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u8 reg;
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while (1) {
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reg = readl(&p2wi->status);
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if (reg & P2WI_STAT_TRANS_ERR) {
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ret = -EIO;
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break;
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}
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if (reg & P2WI_STAT_TRANS_DONE) {
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ret = 0;
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break;
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}
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if (timer_get_us() > tmo) {
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ret = -ETIME;
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break;
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}
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}
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writel(reg, &p2wi->status); /* Clear status bits */
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return ret;
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}
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int p2wi_read(const u8 addr, u8 *data)
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{
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struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUN6I_P2WI_BASE;
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int ret;
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writel(P2WI_DATADDR_BYTE_1(addr), &p2wi->dataddr0);
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writel(P2WI_DATA_NUM_BYTES(1) |
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P2WI_DATA_NUM_BYTES_READ, &p2wi->numbytes);
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writel(P2WI_STAT_TRANS_DONE, &p2wi->status);
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writel(P2WI_CTRL_TRANS_START, &p2wi->ctrl);
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ret = p2wi_await_trans();
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*data = readl(&p2wi->data0) & P2WI_DATA_BYTE_1_MASK;
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return ret;
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}
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int p2wi_write(const u8 addr, u8 data)
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{
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struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUN6I_P2WI_BASE;
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writel(P2WI_DATADDR_BYTE_1(addr), &p2wi->dataddr0);
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writel(P2WI_DATA_BYTE_1(data), &p2wi->data0);
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writel(P2WI_DATA_NUM_BYTES(1), &p2wi->numbytes);
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writel(P2WI_STAT_TRANS_DONE, &p2wi->status);
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writel(P2WI_CTRL_TRANS_START, &p2wi->ctrl);
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return p2wi_await_trans();
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}
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