Commit df5da47f authored by Hoan Tran's avatar Hoan Tran Committed by Wolfram Sang

i2c: xgene-slimpro: Add ACPI support by using PCC mailbox

This patch adds ACPI support by using PCC mailbox communication
interface.
Signed-off-by: default avatarHoan Tran <hotran@apm.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent d140bd42
......@@ -22,6 +22,7 @@
* using the APM X-Gene SLIMpro mailbox driver.
*
*/
#include <acpi/pcc.h>
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
......@@ -89,6 +90,8 @@
((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
#define SLIMPRO_MSG_TYPE(v) (((v) & 0xF0000000) >> 28)
/*
* Encode for upper address for block data
*/
......@@ -99,19 +102,47 @@
& 0x3FF00000))
#define SLIMPRO_IIC_ENCODE_ADDR(a) ((a) & 0x000FFFFF)
#define SLIMPRO_IIC_MSG_DWORD_COUNT 3
/* PCC related defines */
#define PCC_SIGNATURE 0x50424300
#define PCC_STS_CMD_COMPLETE BIT(0)
#define PCC_STS_SCI_DOORBELL BIT(1)
#define PCC_STS_ERR BIT(2)
#define PCC_STS_PLAT_NOTIFY BIT(3)
#define PCC_CMD_GENERATE_DB_INT BIT(15)
struct slimpro_i2c_dev {
struct i2c_adapter adapter;
struct device *dev;
struct mbox_chan *mbox_chan;
struct mbox_client mbox_client;
int mbox_idx;
struct completion rd_complete;
u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
u32 *resp_msg;
phys_addr_t comm_base_addr;
void *pcc_comm_addr;
};
#define to_slimpro_i2c_dev(cl) \
container_of(cl, struct slimpro_i2c_dev, mbox_client)
/*
* This function tests and clears a bitmask then returns its old value
*/
static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
{
u16 ret, val;
val = le16_to_cpu(READ_ONCE(*addr));
ret = val & mask;
val &= ~mask;
WRITE_ONCE(*addr, cpu_to_le16(val));
return ret;
}
static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
{
struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
......@@ -129,9 +160,53 @@ static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
complete(&ctx->rd_complete);
}
static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
{
struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
/* Check if platform sends interrupt */
if (!xgene_word_tst_and_clr(&generic_comm_base->status,
PCC_STS_SCI_DOORBELL))
return;
if (xgene_word_tst_and_clr(&generic_comm_base->status,
PCC_STS_CMD_COMPLETE)) {
msg = generic_comm_base + 1;
/* Response message msg[1] contains the return value. */
if (ctx->resp_msg)
*ctx->resp_msg = ((u32 *)msg)[1];
complete(&ctx->rd_complete);
}
}
static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
{
struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
u32 *ptr = (void *)(generic_comm_base + 1);
u16 status;
int i;
WRITE_ONCE(generic_comm_base->signature,
cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));
WRITE_ONCE(generic_comm_base->command,
cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INT));
status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
status &= ~PCC_STS_CMD_COMPLETE;
WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));
/* Copy the message to the PCC comm space */
for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
}
static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
{
if (ctx->mbox_client.tx_block) {
if (ctx->mbox_client.tx_block || !acpi_disabled) {
if (!wait_for_completion_timeout(&ctx->rd_complete,
msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
return -ETIMEDOUT;
......@@ -152,6 +227,11 @@ static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
ctx->resp_msg = data;
if (!acpi_disabled) {
reinit_completion(&ctx->rd_complete);
slimpro_i2c_pcc_tx_prepare(ctx, msg);
}
rc = mbox_send_message(ctx->mbox_chan, msg);
if (rc < 0)
goto err;
......@@ -159,6 +239,9 @@ static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
rc = start_i2c_msg_xfer(ctx);
err:
if (!acpi_disabled)
mbox_chan_txdone(ctx->mbox_chan, 0);
ctx->resp_msg = NULL;
return rc;
......@@ -379,17 +462,73 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
/* Request mailbox channel */
cl->dev = &pdev->dev;
cl->rx_callback = slimpro_i2c_rx_cb;
cl->tx_block = true;
init_completion(&ctx->rd_complete);
cl->tx_tout = MAILBOX_OP_TIMEOUT;
cl->knows_txdone = false;
if (acpi_disabled) {
cl->tx_block = true;
cl->rx_callback = slimpro_i2c_rx_cb;
ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
if (IS_ERR(ctx->mbox_chan)) {
dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
return PTR_ERR(ctx->mbox_chan);
}
} else {
struct acpi_pcct_hw_reduced *cppc_ss;
if (device_property_read_u32(&pdev->dev, "pcc-channel",
&ctx->mbox_idx))
ctx->mbox_idx = MAILBOX_I2C_INDEX;
cl->tx_block = false;
cl->rx_callback = slimpro_i2c_pcc_rx_cb;
ctx->mbox_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
if (IS_ERR(ctx->mbox_chan)) {
dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
return PTR_ERR(ctx->mbox_chan);
}
/*
* The PCC mailbox controller driver should
* have parsed the PCCT (global table of all
* PCC channels) and stored pointers to the
* subspace communication region in con_priv.
*/
cppc_ss = ctx->mbox_chan->con_priv;
if (!cppc_ss) {
dev_err(&pdev->dev, "PPC subspace not found\n");
rc = -ENOENT;
goto mbox_err;
}
if (!ctx->mbox_chan->mbox->txdone_irq) {
dev_err(&pdev->dev, "PCC IRQ not supported\n");
rc = -ENOENT;
goto mbox_err;
}
/*
* This is the shared communication region
* for the OS and Platform to communicate over.
*/
ctx->comm_base_addr = cppc_ss->base_address;
if (ctx->comm_base_addr) {
ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
cppc_ss->length,
MEMREMAP_WB);
} else {
dev_err(&pdev->dev, "Failed to get PCC comm region\n");
rc = -ENOENT;
goto mbox_err;
}
if (!ctx->pcc_comm_addr) {
dev_err(&pdev->dev,
"Failed to ioremap PCC comm region\n");
rc = -ENOMEM;
goto mbox_err;
}
}
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (rc)
dev_warn(&pdev->dev, "Unable to set dma mask\n");
......@@ -404,13 +543,19 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
i2c_set_adapdata(adapter, ctx);
rc = i2c_add_adapter(adapter);
if (rc) {
mbox_free_channel(ctx->mbox_chan);
return rc;
}
if (rc)
goto mbox_err;
dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
return 0;
mbox_err:
if (acpi_disabled)
mbox_free_channel(ctx->mbox_chan);
else
pcc_mbox_free_channel(ctx->mbox_chan);
return rc;
}
static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
......@@ -419,7 +564,10 @@ static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
i2c_del_adapter(&ctx->adapter);
if (acpi_disabled)
mbox_free_channel(ctx->mbox_chan);
else
pcc_mbox_free_channel(ctx->mbox_chan);
return 0;
}
......
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