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![Simon Glass](/assets/img/avatar_default.png)
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
187 lines
4.6 KiB
C
187 lines
4.6 KiB
C
/*
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* Qualcomm SPMI bus driver
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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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* Loosely based on Little Kernel driver
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*
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* SPDX-License-Identifier: BSD-3-Clause
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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 <fdtdec.h>
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#include <asm/io.h>
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#include <spmi/spmi.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
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#define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
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#define SPMI_REG_CMD0 0x0
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#define SPMI_REG_CONFIG 0x4
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#define SPMI_REG_STATUS 0x8
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#define SPMI_REG_WDATA 0x10
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#define SPMI_REG_RDATA 0x18
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#define SPMI_CMD_OPCODE_SHIFT 27
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#define SPMI_CMD_SLAVE_ID_SHIFT 20
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#define SPMI_CMD_ADDR_SHIFT 12
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#define SPMI_CMD_ADDR_OFFSET_SHIFT 4
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#define SPMI_CMD_BYTE_CNT_SHIFT 0
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#define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
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#define SPMI_CMD_EXT_REG_READ_LONG 0x01
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#define SPMI_STATUS_DONE 0x1
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#define SPMI_MAX_CHANNELS 128
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#define SPMI_MAX_SLAVES 16
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#define SPMI_MAX_PERIPH 256
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struct msm_spmi_priv {
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phys_addr_t arb_chnl; /* ARB channel mapping base */
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phys_addr_t spmi_core; /* SPMI core */
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phys_addr_t spmi_obs; /* SPMI observer */
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/* SPMI channel map */
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uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
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};
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static int msm_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 msm_spmi_priv *priv = dev_get_priv(dev);
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unsigned channel;
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uint32_t reg = 0;
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if (usid >= SPMI_MAX_SLAVES)
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return -EIO;
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if (pid >= SPMI_MAX_PERIPH)
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return -EIO;
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channel = priv->channel_map[usid][pid];
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/* Disable IRQ mode for the current channel*/
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writel(0x0, priv->spmi_core + SPMI_CH_OFFSET(channel) +
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SPMI_REG_CONFIG);
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/* Write single byte */
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writel(val, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA);
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/* Prepare write command */
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reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT;
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reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
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reg |= (pid << SPMI_CMD_ADDR_SHIFT);
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reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
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reg |= 1; /* byte count */
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/* Send write command */
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writel(reg, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
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/* Wait till CMD DONE status */
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reg = 0;
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while (!reg) {
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reg = readl(priv->spmi_core + SPMI_CH_OFFSET(channel) +
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SPMI_REG_STATUS);
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}
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if (reg ^ SPMI_STATUS_DONE) {
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printf("SPMI write failure.\n");
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return -EIO;
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}
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return 0;
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}
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static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
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{
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struct msm_spmi_priv *priv = dev_get_priv(dev);
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unsigned channel;
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uint32_t reg = 0;
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if (usid >= SPMI_MAX_SLAVES)
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return -EIO;
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if (pid >= SPMI_MAX_PERIPH)
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return -EIO;
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channel = priv->channel_map[usid][pid];
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/* Disable IRQ mode for the current channel*/
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writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
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/* Prepare read command */
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reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
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reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
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reg |= (pid << SPMI_CMD_ADDR_SHIFT);
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reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
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reg |= 1; /* byte count */
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/* Request read */
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writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
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/* Wait till CMD DONE status */
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reg = 0;
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while (!reg) {
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reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
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SPMI_REG_STATUS);
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}
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if (reg ^ SPMI_STATUS_DONE) {
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printf("SPMI read failure.\n");
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return -EIO;
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}
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/* Read the data */
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return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
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SPMI_REG_RDATA) & 0xFF;
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}
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static struct dm_spmi_ops msm_spmi_ops = {
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.read = msm_spmi_read,
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.write = msm_spmi_write,
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};
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static int msm_spmi_probe(struct udevice *dev)
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{
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struct udevice *parent = dev->parent;
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struct msm_spmi_priv *priv = dev_get_priv(dev);
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int node = dev_of_offset(dev);
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int i;
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priv->arb_chnl = devfdt_get_addr(dev);
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priv->spmi_core = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
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dev_of_offset(parent), node, "reg", 1, NULL, false);
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priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
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dev_of_offset(parent), node, "reg", 2, NULL, false);
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if (priv->arb_chnl == FDT_ADDR_T_NONE ||
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priv->spmi_core == FDT_ADDR_T_NONE ||
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priv->spmi_obs == FDT_ADDR_T_NONE)
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return -EINVAL;
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/* Scan peripherals connected to each SPMI channel */
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for (i = 0; i < SPMI_MAX_CHANNELS ; i++) {
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uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
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uint8_t slave_id = (periph & 0xf0000) >> 16;
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uint8_t pid = (periph & 0xff00) >> 8;
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priv->channel_map[slave_id][pid] = i;
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}
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return 0;
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}
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static const struct udevice_id msm_spmi_ids[] = {
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{ .compatible = "qcom,spmi-pmic-arb" },
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{ }
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};
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U_BOOT_DRIVER(msm_spmi) = {
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.name = "msm_spmi",
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.id = UCLASS_SPMI,
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.of_match = msm_spmi_ids,
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.ops = &msm_spmi_ops,
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.probe = msm_spmi_probe,
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.priv_auto_alloc_size = sizeof(struct msm_spmi_priv),
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};
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