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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023 Linaro Ltd. */
#include <linux/platform_device.h>
#include <linux/io.h>
#include "gsi.h"
#include "reg.h"
#include "gsi_reg.h"
/* GSI EE registers as a group are shifted downward by a fixed constant amount
* for IPA versions 4.5 and beyond. This applies to all GSI registers we use
* *except* the ones that disable inter-EE interrupts for channels and event
* channels.
*
* The "raw" (not adjusted) GSI register range is mapped, and a pointer to
* the mapped range is held in gsi->virt_raw. The inter-EE interrupt
* registers are accessed using that pointer.
*
* Most registers are accessed using gsi->virt, which is a copy of the "raw"
* pointer, adjusted downward by the fixed amount.
*/
#define GSI_EE_REG_ADJUST 0x0000d000 /* IPA v4.5+ */
/* Is this register ID valid for the current GSI version? */
static bool gsi_reg_id_valid(struct gsi *gsi, enum gsi_reg_id reg_id)
{
switch (reg_id) {
case INTER_EE_SRC_CH_IRQ_MSK:
case INTER_EE_SRC_EV_CH_IRQ_MSK:
case CH_C_CNTXT_0:
case CH_C_CNTXT_1:
case CH_C_CNTXT_2:
case CH_C_CNTXT_3:
case CH_C_QOS:
case CH_C_SCRATCH_0:
case CH_C_SCRATCH_1:
case CH_C_SCRATCH_2:
case CH_C_SCRATCH_3:
case EV_CH_E_CNTXT_0:
case EV_CH_E_CNTXT_1:
case EV_CH_E_CNTXT_2:
case EV_CH_E_CNTXT_3:
case EV_CH_E_CNTXT_4:
case EV_CH_E_CNTXT_8:
case EV_CH_E_CNTXT_9:
case EV_CH_E_CNTXT_10:
case EV_CH_E_CNTXT_11:
case EV_CH_E_CNTXT_12:
case EV_CH_E_CNTXT_13:
case EV_CH_E_SCRATCH_0:
case EV_CH_E_SCRATCH_1:
case CH_C_DOORBELL_0:
case EV_CH_E_DOORBELL_0:
case GSI_STATUS:
case CH_CMD:
case EV_CH_CMD:
case GENERIC_CMD:
case HW_PARAM_2:
case CNTXT_TYPE_IRQ:
case CNTXT_TYPE_IRQ_MSK:
case CNTXT_SRC_CH_IRQ:
case CNTXT_SRC_CH_IRQ_MSK:
case CNTXT_SRC_CH_IRQ_CLR:
case CNTXT_SRC_EV_CH_IRQ:
case CNTXT_SRC_EV_CH_IRQ_MSK:
case CNTXT_SRC_EV_CH_IRQ_CLR:
case CNTXT_SRC_IEOB_IRQ:
case CNTXT_SRC_IEOB_IRQ_MSK:
case CNTXT_SRC_IEOB_IRQ_CLR:
case CNTXT_GLOB_IRQ_STTS:
case CNTXT_GLOB_IRQ_EN:
case CNTXT_GLOB_IRQ_CLR:
case CNTXT_GSI_IRQ_STTS:
case CNTXT_GSI_IRQ_EN:
case CNTXT_GSI_IRQ_CLR:
case CNTXT_INTSET:
case ERROR_LOG:
case ERROR_LOG_CLR:
case CNTXT_SCRATCH_0:
return true;
default:
return false;
}
}
const struct reg *gsi_reg(struct gsi *gsi, enum gsi_reg_id reg_id)
{
if (WARN(!gsi_reg_id_valid(gsi, reg_id), "invalid reg %u\n", reg_id))
return NULL;
return reg(gsi->regs, reg_id);
}
static const struct regs *gsi_regs(struct gsi *gsi)
{
switch (gsi->version) {
case IPA_VERSION_3_1:
return &gsi_regs_v3_1;
case IPA_VERSION_3_5_1:
return &gsi_regs_v3_5_1;
case IPA_VERSION_4_2:
return &gsi_regs_v4_0;
case IPA_VERSION_4_5:
case IPA_VERSION_4_7:
return &gsi_regs_v4_5;
case IPA_VERSION_4_9:
case IPA_VERSION_4_11:
return &gsi_regs_v4_9;
default:
return NULL;
}
}
/* Sets gsi->virt_raw and gsi->virt, and I/O maps the "gsi" memory range */
int gsi_reg_init(struct gsi *gsi, struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
resource_size_t size;
u32 adjust;
/* Get GSI memory range and map it */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsi");
if (!res) {
dev_err(dev, "DT error getting \"gsi\" memory property\n");
return -ENODEV;
}
size = resource_size(res);
if (res->start > U32_MAX || size > U32_MAX - res->start) {
dev_err(dev, "DT memory resource \"gsi\" out of range\n");
return -EINVAL;
}
/* Make sure we can make our pointer adjustment if necessary */
adjust = gsi->version < IPA_VERSION_4_5 ? 0 : GSI_EE_REG_ADJUST;
if (res->start < adjust) {
dev_err(dev, "DT memory resource \"gsi\" too low (< %u)\n",
adjust);
return -EINVAL;
}
gsi->regs = gsi_regs(gsi);
if (!gsi->regs) {
dev_err(dev, "unsupported IPA version %u (?)\n", gsi->version);
return -EINVAL;
}
gsi->virt_raw = ioremap(res->start, size);
if (!gsi->virt_raw) {
dev_err(dev, "unable to remap \"gsi\" memory\n");
return -ENOMEM;
}
/* Most registers are accessed using an adjusted register range */
gsi->virt = gsi->virt_raw - adjust;
return 0;
}
/* Inverse of gsi_reg_init() */
void gsi_reg_exit(struct gsi *gsi)
{
gsi->virt = NULL;
iounmap(gsi->virt_raw);
gsi->virt_raw = NULL;
}
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