mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +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>
156 lines
3.6 KiB
C
156 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Sample SPMI bus driver
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*
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* It emulates bus with single pm8916-like pmic that has only GPIO reigsters.
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <spmi/spmi.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#define EMUL_GPIO_PID_START 0xC0
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#define EMUL_GPIO_PID_END 0xC3
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#define EMUL_GPIO_COUNT 4
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#define EMUL_GPIO_REG_END 0x46 /* Last valid register */
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#define EMUL_PERM_R 0x1
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#define EMUL_PERM_W 0x2
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#define EMUL_PERM_RW (EMUL_PERM_R | EMUL_PERM_W)
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struct sandbox_emul_fake_regs {
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u8 value;
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u8 access_mask;
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u8 perms; /* Access permissions */
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};
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struct sandbox_emul_gpio {
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/* Fake registers - need one more entry as REG_END is valid address. */
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struct sandbox_emul_fake_regs r[EMUL_GPIO_REG_END + 1];
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};
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struct sandbox_spmi_priv {
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struct sandbox_emul_gpio gpios[EMUL_GPIO_COUNT];
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};
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/* Check if valid register was requested */
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static bool check_address_valid(int usid, int pid, int off)
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{
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if (usid != 0)
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return false;
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if (pid < EMUL_GPIO_PID_START || pid > EMUL_GPIO_PID_END)
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return false;
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if (off > EMUL_GPIO_REG_END)
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return false;
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return true;
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}
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static int sandbox_spmi_write(struct udevice *dev, int usid, int pid, int off,
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uint8_t val)
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{
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struct sandbox_spmi_priv *priv = dev_get_priv(dev);
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struct sandbox_emul_fake_regs *regs;
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if (!check_address_valid(usid, pid, off))
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return -EIO;
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regs = priv->gpios[pid & 0x3].r; /* Last 3 bits of pid are gpio # */
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switch (off) {
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case 0x40: /* Control */
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val &= regs[off].access_mask;
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if (((val & 0x30) == 0x10) || ((val & 0x30) == 0x20)) {
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/* out/inout - set status register */
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regs[0x8].value &= ~0x1;
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regs[0x8].value |= val & 0x1;
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}
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break;
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default:
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if (regs[off].perms & EMUL_PERM_W)
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regs[off].value = val & regs[off].access_mask;
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}
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return 0;
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}
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static int sandbox_spmi_read(struct udevice *dev, int usid, int pid, int off)
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{
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struct sandbox_spmi_priv *priv = dev_get_priv(dev);
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struct sandbox_emul_fake_regs *regs;
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if (!check_address_valid(usid, pid, off))
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return -EIO;
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regs = priv->gpios[pid & 0x3].r; /* Last 3 bits of pid are gpio # */
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if (regs[0x46].value == 0) /* Block disabled */
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return 0;
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switch (off) {
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case 0x8: /* Status */
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if (regs[0x46].value == 0) /* Block disabled */
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return 0;
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return regs[off].value;
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default:
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if (regs[off].perms & EMUL_PERM_R)
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return regs[off].value;
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else
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return 0;
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}
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}
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static struct dm_spmi_ops sandbox_spmi_ops = {
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.read = sandbox_spmi_read,
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.write = sandbox_spmi_write,
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};
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static int sandbox_spmi_probe(struct udevice *dev)
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{
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struct sandbox_spmi_priv *priv = dev_get_priv(dev);
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int i;
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for (i = 0; i < EMUL_GPIO_COUNT; ++i) {
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struct sandbox_emul_fake_regs *regs = priv->gpios[i].r;
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regs[4].perms = EMUL_PERM_R;
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regs[4].value = 0x10;
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regs[5].perms = EMUL_PERM_R;
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regs[5].value = 0x5;
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regs[8].access_mask = 0x81;
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regs[8].perms = EMUL_PERM_RW;
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regs[0x40].access_mask = 0x7F;
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regs[0x40].perms = EMUL_PERM_RW;
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regs[0x41].access_mask = 7;
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regs[0x41].perms = EMUL_PERM_RW;
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regs[0x42].access_mask = 7;
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regs[0x42].perms = EMUL_PERM_RW;
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regs[0x42].value = 0x4;
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regs[0x45].access_mask = 0x3F;
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regs[0x45].perms = EMUL_PERM_RW;
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regs[0x45].value = 0x1;
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regs[0x46].access_mask = 0x80;
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regs[0x46].perms = EMUL_PERM_RW;
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regs[0x46].value = 0x80;
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}
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return 0;
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}
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static const struct udevice_id sandbox_spmi_ids[] = {
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{ .compatible = "sandbox,spmi" },
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{ }
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};
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U_BOOT_DRIVER(msm_spmi) = {
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.name = "sandbox_spmi",
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.id = UCLASS_SPMI,
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.of_match = sandbox_spmi_ids,
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.ops = &sandbox_spmi_ops,
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.probe = sandbox_spmi_probe,
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.priv_auto_alloc_size = sizeof(struct sandbox_spmi_priv),
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};
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