diff options
Diffstat (limited to 'drivers/spmi/spmi-msm.c')
| -rw-r--r-- | drivers/spmi/spmi-msm.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/spmi/spmi-msm.c b/drivers/spmi/spmi-msm.c new file mode 100644 index 0000000000..0cef505e37 --- /dev/null +++ b/drivers/spmi/spmi-msm.c @@ -0,0 +1,189 @@ +/* + * Qualcomm SPMI bus driver + * + * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> + * + * Loosely based on Little Kernel driver + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <fdtdec.h> +#include <asm/io.h> +#include <spmi/spmi.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define ARB_CHANNEL_OFFSET(n) (0x4 * (n)) +#define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000) + +#define SPMI_REG_CMD0 0x0 +#define SPMI_REG_CONFIG 0x4 +#define SPMI_REG_STATUS 0x8 +#define SPMI_REG_WDATA 0x10 +#define SPMI_REG_RDATA 0x18 + +#define SPMI_CMD_OPCODE_SHIFT 27 +#define SPMI_CMD_SLAVE_ID_SHIFT 20 +#define SPMI_CMD_ADDR_SHIFT 12 +#define SPMI_CMD_ADDR_OFFSET_SHIFT 4 +#define SPMI_CMD_BYTE_CNT_SHIFT 0 + +#define SPMI_CMD_EXT_REG_WRITE_LONG 0x00 +#define SPMI_CMD_EXT_REG_READ_LONG 0x01 + +#define SPMI_STATUS_DONE 0x1 + +#define SPMI_MAX_CHANNELS 128 +#define SPMI_MAX_SLAVES 16 +#define SPMI_MAX_PERIPH 256 + +struct msm_spmi_priv { + phys_addr_t arb_chnl; /* ARB channel mapping base */ + phys_addr_t spmi_core; /* SPMI core */ + phys_addr_t spmi_obs; /* SPMI observer */ + /* SPMI channel map */ + uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH]; +}; + +static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off, + uint8_t val) +{ + struct msm_spmi_priv *priv = dev_get_priv(dev); + unsigned channel; + uint32_t reg = 0; + + if (usid >= SPMI_MAX_SLAVES) + return -EIO; + if (pid >= SPMI_MAX_PERIPH) + return -EIO; + + channel = priv->channel_map[usid][pid]; + + /* Disable IRQ mode for the current channel*/ + writel(0x0, priv->spmi_core + SPMI_CH_OFFSET(channel) + + SPMI_REG_CONFIG); + + /* Write single byte */ + writel(val, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA); + + /* Prepare write command */ + reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT; + reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT); + reg |= (pid << SPMI_CMD_ADDR_SHIFT); + reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT); + reg |= 1; /* byte count */ + + /* Send write command */ + writel(reg, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0); + + /* Wait till CMD DONE status */ + reg = 0; + while (!reg) { + reg = readl(priv->spmi_core + SPMI_CH_OFFSET(channel) + + SPMI_REG_STATUS); + } + + if (reg ^ SPMI_STATUS_DONE) { + printf("SPMI write failure.\n"); + return -EIO; + } + + return 0; +} + +static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off) +{ + struct msm_spmi_priv *priv = dev_get_priv(dev); + unsigned channel; + uint32_t reg = 0; + + if (usid >= SPMI_MAX_SLAVES) + return -EIO; + if (pid >= SPMI_MAX_PERIPH) + return -EIO; + + channel = priv->channel_map[usid][pid]; + + /* Disable IRQ mode for the current channel*/ + writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG); + + /* Prepare read command */ + reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT; + reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT); + reg |= (pid << SPMI_CMD_ADDR_SHIFT); + reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT); + reg |= 1; /* byte count */ + + /* Request read */ + writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0); + + /* Wait till CMD DONE status */ + reg = 0; + while (!reg) { + reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) + + SPMI_REG_STATUS); + } + + if (reg ^ SPMI_STATUS_DONE) { + printf("SPMI read failure.\n"); + return -EIO; + } + + /* Read the data */ + return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) + + SPMI_REG_RDATA) & 0xFF; +} + +static struct dm_spmi_ops msm_spmi_ops = { + .read = msm_spmi_read, + .write = msm_spmi_write, +}; + +static int msm_spmi_probe(struct udevice *dev) +{ + struct udevice *parent = dev->parent; + struct msm_spmi_priv *priv = dev_get_priv(dev); + int i; + + priv->arb_chnl = dev_get_addr(dev); + priv->spmi_core = fdtdec_get_addr_size_auto_parent(gd->fdt_blob, + parent->of_offset, + dev->of_offset, + "reg", 1, NULL); + priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob, + parent->of_offset, + dev->of_offset, "reg", + 2, NULL); + if (priv->arb_chnl == FDT_ADDR_T_NONE || + priv->spmi_core == FDT_ADDR_T_NONE || + priv->spmi_obs == FDT_ADDR_T_NONE) + return -EINVAL; + + /* Scan peripherals connected to each SPMI channel */ + for (i = 0; i < SPMI_MAX_CHANNELS ; i++) { + uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i)); + uint8_t slave_id = (periph & 0xf0000) >> 16; + uint8_t pid = (periph & 0xff00) >> 8; + + priv->channel_map[slave_id][pid] = i; + } + return 0; +} + +static const struct udevice_id msm_spmi_ids[] = { + { .compatible = "qcom,spmi-pmic-arb" }, + { } +}; + +U_BOOT_DRIVER(msm_spmi) = { + .name = "msm_spmi", + .id = UCLASS_SPMI, + .of_match = msm_spmi_ids, + .ops = &msm_spmi_ops, + .probe = msm_spmi_probe, + .priv_auto_alloc_size = sizeof(struct msm_spmi_priv), +}; |