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linux/drivers/mmc/host/sdhci-pci-arasan.c
Atul Garg d72d72cd33 mmc:host:sdhci-pci:Addition of Arasan PCI Controller with integrated phy. 
The Arasan Controller is based on a FPGA platform and has integrated phy
with specific registers used during initialization and
management of different modes. The phy and the controller are integrated
and registers are very specific to Arasan.

Arasan being an IP provider, licenses these IPs to various companies for
integration of IP in custom SOCs. The custom SOCs define own register
map depending on how bits are tied inside the SOC for phy registers,
depending on SOC memory plan and hence will require own platform drivers.

If more details on phy registers are required, an interface document is
hosted at https://arasan.com/NF/eMMC5.1 PHY Programming in Linux.pdf.

Signed-off-by: Atul Garg <agarg@arasan.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-01-04 12:46:11 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* sdhci-pci-arasan.c - Driver for Arasan PCI Controller with
* integrated phy.
*
* Copyright (C) 2017 Arasan Chip Systems Inc.
*
* Author: Atul Garg <agarg@arasan.com>
*/
#include <linux/pci.h>
#include <linux/delay.h>
#include "sdhci.h"
#include "sdhci-pci.h"
/* Extra registers for Arasan SD/SDIO/MMC Host Controller with PHY */
#define PHY_ADDR_REG 0x300
#define PHY_DAT_REG 0x304
#define PHY_WRITE BIT(8)
#define PHY_BUSY BIT(9)
#define DATA_MASK 0xFF
/* PHY Specific Registers */
#define DLL_STATUS 0x00
#define IPAD_CTRL1 0x01
#define IPAD_CTRL2 0x02
#define IPAD_STS 0x03
#define IOREN_CTRL1 0x06
#define IOREN_CTRL2 0x07
#define IOPU_CTRL1 0x08
#define IOPU_CTRL2 0x09
#define ITAP_DELAY 0x0C
#define OTAP_DELAY 0x0D
#define STRB_SEL 0x0E
#define CLKBUF_SEL 0x0F
#define MODE_CTRL 0x11
#define DLL_TRIM 0x12
#define CMD_CTRL 0x20
#define DATA_CTRL 0x21
#define STRB_CTRL 0x22
#define CLK_CTRL 0x23
#define PHY_CTRL 0x24
#define DLL_ENBL BIT(3)
#define RTRIM_EN BIT(1)
#define PDB_ENBL BIT(1)
#define RETB_ENBL BIT(6)
#define ODEN_CMD BIT(1)
#define ODEN_DAT 0xFF
#define REN_STRB BIT(0)
#define REN_CMND BIT(1)
#define REN_DATA 0xFF
#define PU_CMD BIT(1)
#define PU_DAT 0xFF
#define ITAPDLY_EN BIT(0)
#define OTAPDLY_EN BIT(0)
#define OD_REL_CMD BIT(1)
#define OD_REL_DAT 0xFF
#define DLLTRM_ICP 0x8
#define PDB_CMND BIT(0)
#define PDB_DATA 0xFF
#define PDB_STRB BIT(0)
#define PDB_CLOCK BIT(0)
#define CALDONE_MASK 0x10
#define DLL_RDY_MASK 0x10
#define MAX_CLK_BUF 0x7
/* Mode Controls */
#define ENHSTRB_MODE BIT(0)
#define HS400_MODE BIT(1)
#define LEGACY_MODE BIT(2)
#define DDR50_MODE BIT(3)
/*
* Controller has no specific bits for HS200/HS.
* Used BIT(4), BIT(5) for software programming.
*/
#define HS200_MODE BIT(4)
#define HISPD_MODE BIT(5)
#define OTAPDLY(x) (((x) << 1) | OTAPDLY_EN)
#define ITAPDLY(x) (((x) << 1) | ITAPDLY_EN)
#define FREQSEL(x) (((x) << 5) | DLL_ENBL)
#define IOPAD(x, y) ((x) | ((y) << 2))
/* Arasan private data */
struct arasan_host {
u32 chg_clk;
};
static int arasan_phy_addr_poll(struct sdhci_host *host, u32 offset, u32 mask)
{
ktime_t timeout = ktime_add_us(ktime_get(), 100);
bool failed;
u8 val = 0;
while (1) {
failed = ktime_after(ktime_get(), timeout);
val = sdhci_readw(host, PHY_ADDR_REG);
if (!(val & mask))
return 0;
if (failed)
return -EBUSY;
}
}
static int arasan_phy_write(struct sdhci_host *host, u8 data, u8 offset)
{
sdhci_writew(host, data, PHY_DAT_REG);
sdhci_writew(host, (PHY_WRITE | offset), PHY_ADDR_REG);
return arasan_phy_addr_poll(host, PHY_ADDR_REG, PHY_BUSY);
}
static int arasan_phy_read(struct sdhci_host *host, u8 offset, u8 *data)
{
int ret;
sdhci_writew(host, 0, PHY_DAT_REG);
sdhci_writew(host, offset, PHY_ADDR_REG);
ret = arasan_phy_addr_poll(host, PHY_ADDR_REG, PHY_BUSY);
/* Masking valid data bits */
*data = sdhci_readw(host, PHY_DAT_REG) & DATA_MASK;
return ret;
}
static int arasan_phy_sts_poll(struct sdhci_host *host, u32 offset, u32 mask)
{
int ret;
ktime_t timeout = ktime_add_us(ktime_get(), 100);
bool failed;
u8 val = 0;
while (1) {
failed = ktime_after(ktime_get(), timeout);
ret = arasan_phy_read(host, offset, &val);
if (ret)
return -EBUSY;
else if (val & mask)
return 0;
if (failed)
return -EBUSY;
}
}
/* Initialize the Arasan PHY */
static int arasan_phy_init(struct sdhci_host *host)
{
int ret;
u8 val;
/* Program IOPADs and wait for calibration to be done */
if (arasan_phy_read(host, IPAD_CTRL1, &val) ||
arasan_phy_write(host, val | RETB_ENBL | PDB_ENBL, IPAD_CTRL1) ||
arasan_phy_read(host, IPAD_CTRL2, &val) ||
arasan_phy_write(host, val | RTRIM_EN, IPAD_CTRL2))
return -EBUSY;
ret = arasan_phy_sts_poll(host, IPAD_STS, CALDONE_MASK);
if (ret)
return -EBUSY;
/* Program CMD/Data lines */
if (arasan_phy_read(host, IOREN_CTRL1, &val) ||
arasan_phy_write(host, val | REN_CMND | REN_STRB, IOREN_CTRL1) ||
arasan_phy_read(host, IOPU_CTRL1, &val) ||
arasan_phy_write(host, val | PU_CMD, IOPU_CTRL1) ||
arasan_phy_read(host, CMD_CTRL, &val) ||
arasan_phy_write(host, val | PDB_CMND, CMD_CTRL) ||
arasan_phy_read(host, IOREN_CTRL2, &val) ||
arasan_phy_write(host, val | REN_DATA, IOREN_CTRL2) ||
arasan_phy_read(host, IOPU_CTRL2, &val) ||
arasan_phy_write(host, val | PU_DAT, IOPU_CTRL2) ||
arasan_phy_read(host, DATA_CTRL, &val) ||
arasan_phy_write(host, val | PDB_DATA, DATA_CTRL) ||
arasan_phy_read(host, STRB_CTRL, &val) ||
arasan_phy_write(host, val | PDB_STRB, STRB_CTRL) ||
arasan_phy_read(host, CLK_CTRL, &val) ||
arasan_phy_write(host, val | PDB_CLOCK, CLK_CTRL) ||
arasan_phy_read(host, CLKBUF_SEL, &val) ||
arasan_phy_write(host, val | MAX_CLK_BUF, CLKBUF_SEL) ||
arasan_phy_write(host, LEGACY_MODE, MODE_CTRL))
return -EBUSY;
return 0;
}
/* Set Arasan PHY for different modes */
static int arasan_phy_set(struct sdhci_host *host, u8 mode, u8 otap,
u8 drv_type, u8 itap, u8 trim, u8 clk)
{
u8 val;
int ret;
if (mode == HISPD_MODE || mode == HS200_MODE)
ret = arasan_phy_write(host, 0x0, MODE_CTRL);
else
ret = arasan_phy_write(host, mode, MODE_CTRL);
if (ret)
return ret;
if (mode == HS400_MODE || mode == HS200_MODE) {
ret = arasan_phy_read(host, IPAD_CTRL1, &val);
if (ret)
return ret;
ret = arasan_phy_write(host, IOPAD(val, drv_type), IPAD_CTRL1);
if (ret)
return ret;
}
if (mode == LEGACY_MODE) {
ret = arasan_phy_write(host, 0x0, OTAP_DELAY);
if (ret)
return ret;
ret = arasan_phy_write(host, 0x0, ITAP_DELAY);
} else {
ret = arasan_phy_write(host, OTAPDLY(otap), OTAP_DELAY);
if (ret)
return ret;
if (mode != HS200_MODE)
ret = arasan_phy_write(host, ITAPDLY(itap), ITAP_DELAY);
else
ret = arasan_phy_write(host, 0x0, ITAP_DELAY);
}
if (ret)
return ret;
if (mode != LEGACY_MODE) {
ret = arasan_phy_write(host, trim, DLL_TRIM);
if (ret)
return ret;
}
ret = arasan_phy_write(host, 0, DLL_STATUS);
if (ret)
return ret;
if (mode != LEGACY_MODE) {
ret = arasan_phy_write(host, FREQSEL(clk), DLL_STATUS);
if (ret)
return ret;
ret = arasan_phy_sts_poll(host, DLL_STATUS, DLL_RDY_MASK);
if (ret)
return -EBUSY;
}
return 0;
}
static int arasan_select_phy_clock(struct sdhci_host *host)
{
struct sdhci_pci_slot *slot = sdhci_priv(host);
struct arasan_host *arasan_host = sdhci_pci_priv(slot);
u8 clk;
if (arasan_host->chg_clk == host->mmc->ios.clock)
return 0;
arasan_host->chg_clk = host->mmc->ios.clock;
if (host->mmc->ios.clock == 200000000)
clk = 0x0;
else if (host->mmc->ios.clock == 100000000)
clk = 0x2;
else if (host->mmc->ios.clock == 50000000)
clk = 0x1;
else
clk = 0x0;
if (host->mmc_host_ops.hs400_enhanced_strobe) {
arasan_phy_set(host, ENHSTRB_MODE, 1, 0x0, 0x0,
DLLTRM_ICP, clk);
} else {
switch (host->mmc->ios.timing) {
case MMC_TIMING_LEGACY:
arasan_phy_set(host, LEGACY_MODE, 0x0, 0x0, 0x0,
0x0, 0x0);
break;
case MMC_TIMING_MMC_HS:
case MMC_TIMING_SD_HS:
arasan_phy_set(host, HISPD_MODE, 0x3, 0x0, 0x2,
DLLTRM_ICP, clk);
break;
case MMC_TIMING_MMC_HS200:
case MMC_TIMING_UHS_SDR104:
arasan_phy_set(host, HS200_MODE, 0x2,
host->mmc->ios.drv_type, 0x0,
DLLTRM_ICP, clk);
break;
case MMC_TIMING_MMC_DDR52:
case MMC_TIMING_UHS_DDR50:
arasan_phy_set(host, DDR50_MODE, 0x1, 0x0,
0x0, DLLTRM_ICP, clk);
break;
case MMC_TIMING_MMC_HS400:
arasan_phy_set(host, HS400_MODE, 0x1,
host->mmc->ios.drv_type, 0xa,
DLLTRM_ICP, clk);
break;
default:
break;
}
}
return 0;
}
static int arasan_pci_probe_slot(struct sdhci_pci_slot *slot)
{
int err;
slot->host->mmc->caps |= MMC_CAP_NONREMOVABLE | MMC_CAP_8_BIT_DATA;
err = arasan_phy_init(slot->host);
if (err)
return -ENODEV;
return 0;
}
static void arasan_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
sdhci_set_clock(host, clock);
/* Change phy settings for the new clock */
arasan_select_phy_clock(host);
}
static const struct sdhci_ops arasan_sdhci_pci_ops = {
.set_clock = arasan_sdhci_set_clock,
.enable_dma = sdhci_pci_enable_dma,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
const struct sdhci_pci_fixes sdhci_arasan = {
.probe_slot = arasan_pci_probe_slot,
.ops = &arasan_sdhci_pci_ops,
.priv_size = sizeof(struct arasan_host),
};
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