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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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i2c: xgene-slimpro: Add ACPI support by using PCC mailbox
This patch adds ACPI support by using PCC mailbox communication interface. Signed-off-by: Hoan Tran <hotran@apm.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Hoan Tran
Wolfram Sang
parent
d140bd42b2
commit
df5da47fe7
1 changed files with 161 additions and 13 deletions
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@ -22,6 +22,7 @@
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* using the APM X-Gene SLIMpro mailbox driver.
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*
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*/
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#include <acpi/pcc.h>
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#include <linux/acpi.h>
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#include <linux/dma-mapping.h>
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#include <linux/i2c.h>
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@ -89,6 +90,8 @@
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((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
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((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
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#define SLIMPRO_MSG_TYPE(v) (((v) & 0xF0000000) >> 28)
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/*
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* Encode for upper address for block data
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*/
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@ -99,19 +102,47 @@
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& 0x3FF00000))
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#define SLIMPRO_IIC_ENCODE_ADDR(a) ((a) & 0x000FFFFF)
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#define SLIMPRO_IIC_MSG_DWORD_COUNT 3
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/* PCC related defines */
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#define PCC_SIGNATURE 0x50424300
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#define PCC_STS_CMD_COMPLETE BIT(0)
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#define PCC_STS_SCI_DOORBELL BIT(1)
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#define PCC_STS_ERR BIT(2)
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#define PCC_STS_PLAT_NOTIFY BIT(3)
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#define PCC_CMD_GENERATE_DB_INT BIT(15)
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struct slimpro_i2c_dev {
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struct i2c_adapter adapter;
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struct device *dev;
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struct mbox_chan *mbox_chan;
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struct mbox_client mbox_client;
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int mbox_idx;
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struct completion rd_complete;
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u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
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u32 *resp_msg;
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phys_addr_t comm_base_addr;
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void *pcc_comm_addr;
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};
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#define to_slimpro_i2c_dev(cl) \
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container_of(cl, struct slimpro_i2c_dev, mbox_client)
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/*
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* This function tests and clears a bitmask then returns its old value
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*/
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static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
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{
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u16 ret, val;
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val = le16_to_cpu(READ_ONCE(*addr));
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ret = val & mask;
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val &= ~mask;
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WRITE_ONCE(*addr, cpu_to_le16(val));
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return ret;
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}
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static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
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{
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struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
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@ -129,9 +160,53 @@ static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
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complete(&ctx->rd_complete);
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}
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static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
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{
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struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
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struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
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/* Check if platform sends interrupt */
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if (!xgene_word_tst_and_clr(&generic_comm_base->status,
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PCC_STS_SCI_DOORBELL))
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return;
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if (xgene_word_tst_and_clr(&generic_comm_base->status,
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PCC_STS_CMD_COMPLETE)) {
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msg = generic_comm_base + 1;
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/* Response message msg[1] contains the return value. */
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if (ctx->resp_msg)
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*ctx->resp_msg = ((u32 *)msg)[1];
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complete(&ctx->rd_complete);
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}
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}
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static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
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{
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struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
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u32 *ptr = (void *)(generic_comm_base + 1);
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u16 status;
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int i;
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WRITE_ONCE(generic_comm_base->signature,
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cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));
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WRITE_ONCE(generic_comm_base->command,
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cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INT));
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status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
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status &= ~PCC_STS_CMD_COMPLETE;
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WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));
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/* Copy the message to the PCC comm space */
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for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
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WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
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}
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static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
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{
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if (ctx->mbox_client.tx_block) {
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if (ctx->mbox_client.tx_block || !acpi_disabled) {
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if (!wait_for_completion_timeout(&ctx->rd_complete,
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msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
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return -ETIMEDOUT;
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@ -152,6 +227,11 @@ static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
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ctx->resp_msg = data;
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if (!acpi_disabled) {
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reinit_completion(&ctx->rd_complete);
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slimpro_i2c_pcc_tx_prepare(ctx, msg);
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}
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rc = mbox_send_message(ctx->mbox_chan, msg);
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if (rc < 0)
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goto err;
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@ -159,6 +239,9 @@ static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
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rc = start_i2c_msg_xfer(ctx);
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err:
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if (!acpi_disabled)
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mbox_chan_txdone(ctx->mbox_chan, 0);
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ctx->resp_msg = NULL;
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return rc;
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@ -379,17 +462,73 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
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/* Request mailbox channel */
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cl->dev = &pdev->dev;
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cl->rx_callback = slimpro_i2c_rx_cb;
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cl->tx_block = true;
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init_completion(&ctx->rd_complete);
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cl->tx_tout = MAILBOX_OP_TIMEOUT;
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cl->knows_txdone = false;
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ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
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if (IS_ERR(ctx->mbox_chan)) {
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dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
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return PTR_ERR(ctx->mbox_chan);
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}
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if (acpi_disabled) {
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cl->tx_block = true;
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cl->rx_callback = slimpro_i2c_rx_cb;
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ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
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if (IS_ERR(ctx->mbox_chan)) {
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dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
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return PTR_ERR(ctx->mbox_chan);
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}
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} else {
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struct acpi_pcct_hw_reduced *cppc_ss;
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if (device_property_read_u32(&pdev->dev, "pcc-channel",
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&ctx->mbox_idx))
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ctx->mbox_idx = MAILBOX_I2C_INDEX;
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cl->tx_block = false;
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cl->rx_callback = slimpro_i2c_pcc_rx_cb;
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ctx->mbox_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
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if (IS_ERR(ctx->mbox_chan)) {
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dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
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return PTR_ERR(ctx->mbox_chan);
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}
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/*
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* The PCC mailbox controller driver should
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* have parsed the PCCT (global table of all
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* PCC channels) and stored pointers to the
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* subspace communication region in con_priv.
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*/
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cppc_ss = ctx->mbox_chan->con_priv;
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if (!cppc_ss) {
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dev_err(&pdev->dev, "PPC subspace not found\n");
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rc = -ENOENT;
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goto mbox_err;
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}
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if (!ctx->mbox_chan->mbox->txdone_irq) {
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dev_err(&pdev->dev, "PCC IRQ not supported\n");
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rc = -ENOENT;
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goto mbox_err;
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}
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/*
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* This is the shared communication region
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* for the OS and Platform to communicate over.
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*/
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ctx->comm_base_addr = cppc_ss->base_address;
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if (ctx->comm_base_addr) {
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ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
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cppc_ss->length,
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MEMREMAP_WB);
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} else {
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dev_err(&pdev->dev, "Failed to get PCC comm region\n");
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rc = -ENOENT;
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goto mbox_err;
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}
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if (!ctx->pcc_comm_addr) {
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dev_err(&pdev->dev,
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"Failed to ioremap PCC comm region\n");
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rc = -ENOMEM;
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goto mbox_err;
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}
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}
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rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
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if (rc)
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dev_warn(&pdev->dev, "Unable to set dma mask\n");
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@ -404,13 +543,19 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
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ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
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i2c_set_adapdata(adapter, ctx);
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rc = i2c_add_adapter(adapter);
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if (rc) {
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mbox_free_channel(ctx->mbox_chan);
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return rc;
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}
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if (rc)
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goto mbox_err;
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dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
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return 0;
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mbox_err:
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if (acpi_disabled)
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mbox_free_channel(ctx->mbox_chan);
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else
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pcc_mbox_free_channel(ctx->mbox_chan);
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return rc;
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}
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static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
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@ -419,7 +564,10 @@ static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
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i2c_del_adapter(&ctx->adapter);
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mbox_free_channel(ctx->mbox_chan);
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if (acpi_disabled)
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mbox_free_channel(ctx->mbox_chan);
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else
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pcc_mbox_free_channel(ctx->mbox_chan);
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return 0;
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}
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