diff options
Diffstat (limited to 'drivers/misc/imx8/scu.c')
| -rw-r--r-- | drivers/misc/imx8/scu.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/misc/imx8/scu.c b/drivers/misc/imx8/scu.c new file mode 100644 index 0000000000..0647ddf103 --- /dev/null +++ b/drivers/misc/imx8/scu.c @@ -0,0 +1,266 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2018 NXP + * + * Peng Fan <peng.fan@nxp.com> + */ + +#include <common.h> +#include <asm/io.h> +#include <dm.h> +#include <dm/lists.h> +#include <dm/root.h> +#include <dm/device-internal.h> +#include <asm/arch/sci/sci.h> +#include <linux/iopoll.h> +#include <misc.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct mu_type { + u32 tr[4]; + u32 rr[4]; + u32 sr; + u32 cr; +}; + +struct imx8_scu { + struct mu_type *base; + struct udevice *clk; + struct udevice *pinclk; +}; + +#define MU_CR_GIE_MASK 0xF0000000u +#define MU_CR_RIE_MASK 0xF000000u +#define MU_CR_GIR_MASK 0xF0000u +#define MU_CR_TIE_MASK 0xF00000u +#define MU_CR_F_MASK 0x7u +#define MU_SR_TE0_MASK BIT(23) +#define MU_SR_RF0_MASK BIT(27) +#define MU_TR_COUNT 4 +#define MU_RR_COUNT 4 + +static inline void mu_hal_init(struct mu_type *base) +{ + /* Clear GIEn, RIEn, TIEn, GIRn and ABFn. */ + clrbits_le32(&base->cr, MU_CR_GIE_MASK | MU_CR_RIE_MASK | + MU_CR_TIE_MASK | MU_CR_GIR_MASK | MU_CR_F_MASK); +} + +static int mu_hal_sendmsg(struct mu_type *base, u32 reg_index, u32 msg) +{ + u32 mask = MU_SR_TE0_MASK >> reg_index; + u32 val; + int ret; + + assert(reg_index < MU_TR_COUNT); + + /* Wait TX register to be empty. */ + ret = readl_poll_timeout(&base->sr, val, val & mask, 10000); + if (ret < 0) { + printf("%s timeout\n", __func__); + return -ETIMEDOUT; + } + + writel(msg, &base->tr[reg_index]); + + return 0; +} + +static int mu_hal_receivemsg(struct mu_type *base, u32 reg_index, u32 *msg) +{ + u32 mask = MU_SR_RF0_MASK >> reg_index; + u32 val; + int ret; + + assert(reg_index < MU_TR_COUNT); + + /* Wait RX register to be full. */ + ret = readl_poll_timeout(&base->sr, val, val & mask, 10000); + if (ret < 0) { + printf("%s timeout\n", __func__); + return -ETIMEDOUT; + } + + *msg = readl(&base->rr[reg_index]); + + return 0; +} + +static int sc_ipc_read(struct mu_type *base, void *data) +{ + struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data; + int ret; + u8 count = 0; + + if (!msg) + return -EINVAL; + + /* Read first word */ + ret = mu_hal_receivemsg(base, 0, (u32 *)msg); + if (ret) + return ret; + count++; + + /* Check size */ + if (msg->size > SC_RPC_MAX_MSG) { + *((u32 *)msg) = 0; + return -EINVAL; + } + + /* Read remaining words */ + while (count < msg->size) { + ret = mu_hal_receivemsg(base, count % MU_RR_COUNT, + &msg->DATA.u32[count - 1]); + if (ret) + return ret; + count++; + } + + return 0; +} + +static int sc_ipc_write(struct mu_type *base, void *data) +{ + struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data; + int ret; + u8 count = 0; + + if (!msg) + return -EINVAL; + + /* Check size */ + if (msg->size > SC_RPC_MAX_MSG) + return -EINVAL; + + /* Write first word */ + ret = mu_hal_sendmsg(base, 0, *((u32 *)msg)); + if (ret) + return ret; + count++; + + /* Write remaining words */ + while (count < msg->size) { + ret = mu_hal_sendmsg(base, count % MU_TR_COUNT, + msg->DATA.u32[count - 1]); + if (ret) + return ret; + count++; + } + + return 0; +} + +/* + * Note the function prototype use msgid as the 2nd parameter, here + * we take it as no_resp. + */ +static int imx8_scu_call(struct udevice *dev, int no_resp, void *tx_msg, + int tx_size, void *rx_msg, int rx_size) +{ + struct imx8_scu *priv = dev_get_priv(dev); + sc_err_t result; + int ret; + + /* Expect tx_msg, rx_msg are the same value */ + if (rx_msg && tx_msg != rx_msg) + printf("tx_msg %p, rx_msg %p\n", tx_msg, rx_msg); + + ret = sc_ipc_write(priv->base, tx_msg); + if (ret) + return ret; + if (!no_resp) { + ret = sc_ipc_read(priv->base, rx_msg); + if (ret) + return ret; + } + + result = RPC_R8((struct sc_rpc_msg_s *)tx_msg); + + return sc_err_to_linux(result); +} + +static int imx8_scu_probe(struct udevice *dev) +{ + struct imx8_scu *priv = dev_get_priv(dev); + fdt_addr_t addr; + + debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv); + + addr = devfdt_get_addr(dev); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->base = (struct mu_type *)addr; + + /* U-Boot not enable interrupts, so need to enable RX interrupts */ + mu_hal_init(priv->base); + + gd->arch.scu_dev = dev; + + device_probe(priv->clk); + device_probe(priv->pinclk); + + return 0; +} + +static int imx8_scu_remove(struct udevice *dev) +{ + return 0; +} + +static int imx8_scu_bind(struct udevice *dev) +{ + struct imx8_scu *priv = dev_get_priv(dev); + int ret; + struct udevice *child; + int node; + + debug("%s(dev=%p)\n", __func__, dev); + + node = fdt_node_offset_by_compatible(gd->fdt_blob, -1, + "fsl,imx8qxp-clk"); + if (node < 0) + panic("No clk node found\n"); + + ret = lists_bind_fdt(dev, offset_to_ofnode(node), &child); + if (ret) + return ret; + + priv->clk = child; + + node = fdt_node_offset_by_compatible(gd->fdt_blob, -1, + "fsl,imx8qxp-iomuxc"); + if (node < 0) + panic("No iomuxc node found\n"); + + ret = lists_bind_fdt(dev, offset_to_ofnode(node), &child); + if (ret) + return ret; + + priv->pinclk = child; + + return 0; +} + +static struct misc_ops imx8_scu_ops = { + .call = imx8_scu_call, +}; + +static const struct udevice_id imx8_scu_ids[] = { + { .compatible = "fsl,imx8qxp-mu" }, + { .compatible = "fsl,imx8-mu" }, + { } +}; + +U_BOOT_DRIVER(imx8_scu) = { + .name = "imx8_scu", + .id = UCLASS_MISC, + .of_match = imx8_scu_ids, + .probe = imx8_scu_probe, + .bind = imx8_scu_bind, + .remove = imx8_scu_remove, + .ops = &imx8_scu_ops, + .priv_auto_alloc_size = sizeof(struct imx8_scu), + .flags = DM_FLAG_PRE_RELOC, +}; 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