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57322d542f
linux-next/drivers/mmc/host/sdhci-pci-o2micro.c
ernest.zhang 57322d542f mmc: sdhci: Add support for O2 eMMC HS200 mode 
When use eMMC as boot device, the eMMC signaling voltage is tied to 1.8v
fixed output voltage, bios can set o2 sd host controller PCI configuration
register 0x308 bit4 to 1 to let driver skip 3.3v signaling voltage and
direct use 1.8v singling voltage in eMMC initialize process.

Signed-off-by: ernest.zhang <ernest.zhang@bayhubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-07-30 14:23:37 +02:00

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/*
* Copyright (C) 2013 BayHub Technology Ltd.
*
* Authors: Peter Guo <peter.guo@bayhubtech.com>
* Adam Lee <adam.lee@canonical.com>
* Ernest Zhang <ernest.zhang@bayhubtech.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/pci.h>
#include "sdhci.h"
#include "sdhci-pci.h"
/*
* O2Micro device registers
*/
#define O2_SD_MISC_REG5 0x64
#define O2_SD_LD0_CTRL 0x68
#define O2_SD_DEV_CTRL 0x88
#define O2_SD_LOCK_WP 0xD3
#define O2_SD_TEST_REG 0xD4
#define O2_SD_FUNC_REG0 0xDC
#define O2_SD_MULTI_VCC3V 0xEE
#define O2_SD_CLKREQ 0xEC
#define O2_SD_CAPS 0xE0
#define O2_SD_ADMA1 0xE2
#define O2_SD_ADMA2 0xE7
#define O2_SD_INF_MOD 0xF1
#define O2_SD_MISC_CTRL4 0xFC
#define O2_SD_TUNING_CTRL 0x300
#define O2_SD_PLL_SETTING 0x304
#define O2_SD_MISC_SETTING 0x308
#define O2_SD_CLK_SETTING 0x328
#define O2_SD_CAP_REG2 0x330
#define O2_SD_CAP_REG0 0x334
#define O2_SD_UHS1_CAP_SETTING 0x33C
#define O2_SD_DELAY_CTRL 0x350
#define O2_SD_UHS2_L1_CTRL 0x35C
#define O2_SD_FUNC_REG3 0x3E0
#define O2_SD_FUNC_REG4 0x3E4
#define O2_SD_LED_ENABLE BIT(6)
#define O2_SD_FREG0_LEDOFF BIT(13)
#define O2_SD_FREG4_ENABLE_CLK_SET BIT(22)
#define O2_SD_VENDOR_SETTING 0x110
#define O2_SD_VENDOR_SETTING2 0x1C8
static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
{
u32 scratch_32;
pci_read_config_dword(chip->pdev,
O2_SD_PLL_SETTING, &scratch_32);
scratch_32 &= 0x0000FFFF;
scratch_32 |= value;
pci_write_config_dword(chip->pdev,
O2_SD_PLL_SETTING, scratch_32);
}
static void o2_pci_led_enable(struct sdhci_pci_chip *chip)
{
int ret;
u32 scratch_32;
/* Set led of SD host function enable */
ret = pci_read_config_dword(chip->pdev,
O2_SD_FUNC_REG0, &scratch_32);
if (ret)
return;
scratch_32 &= ~O2_SD_FREG0_LEDOFF;
pci_write_config_dword(chip->pdev,
O2_SD_FUNC_REG0, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_TEST_REG, &scratch_32);
if (ret)
return;
scratch_32 |= O2_SD_LED_ENABLE;
pci_write_config_dword(chip->pdev,
O2_SD_TEST_REG, scratch_32);
}
static void sdhci_pci_o2_fujin2_pci_init(struct sdhci_pci_chip *chip)
{
u32 scratch_32;
int ret;
/* Improve write performance for SD3.0 */
ret = pci_read_config_dword(chip->pdev, O2_SD_DEV_CTRL, &scratch_32);
if (ret)
return;
scratch_32 &= ~((1 << 12) | (1 << 13) | (1 << 14));
pci_write_config_dword(chip->pdev, O2_SD_DEV_CTRL, scratch_32);
/* Enable Link abnormal reset generating Reset */
ret = pci_read_config_dword(chip->pdev, O2_SD_MISC_REG5, &scratch_32);
if (ret)
return;
scratch_32 &= ~((1 << 19) | (1 << 11));
scratch_32 |= (1 << 10);
pci_write_config_dword(chip->pdev, O2_SD_MISC_REG5, scratch_32);
/* set card power over current protection */
ret = pci_read_config_dword(chip->pdev, O2_SD_TEST_REG, &scratch_32);
if (ret)
return;
scratch_32 |= (1 << 4);
pci_write_config_dword(chip->pdev, O2_SD_TEST_REG, scratch_32);
/* adjust the output delay for SD mode */
pci_write_config_dword(chip->pdev, O2_SD_DELAY_CTRL, 0x00002492);
/* Set the output voltage setting of Aux 1.2v LDO */
ret = pci_read_config_dword(chip->pdev, O2_SD_LD0_CTRL, &scratch_32);
if (ret)
return;
scratch_32 &= ~(3 << 12);
pci_write_config_dword(chip->pdev, O2_SD_LD0_CTRL, scratch_32);
/* Set Max power supply capability of SD host */
ret = pci_read_config_dword(chip->pdev, O2_SD_CAP_REG0, &scratch_32);
if (ret)
return;
scratch_32 &= ~(0x01FE);
scratch_32 |= 0x00CC;
pci_write_config_dword(chip->pdev, O2_SD_CAP_REG0, scratch_32);
/* Set DLL Tuning Window */
ret = pci_read_config_dword(chip->pdev,
O2_SD_TUNING_CTRL, &scratch_32);
if (ret)
return;
scratch_32 &= ~(0x000000FF);
scratch_32 |= 0x00000066;
pci_write_config_dword(chip->pdev, O2_SD_TUNING_CTRL, scratch_32);
/* Set UHS2 T_EIDLE */
ret = pci_read_config_dword(chip->pdev,
O2_SD_UHS2_L1_CTRL, &scratch_32);
if (ret)
return;
scratch_32 &= ~(0x000000FC);
scratch_32 |= 0x00000084;
pci_write_config_dword(chip->pdev, O2_SD_UHS2_L1_CTRL, scratch_32);
/* Set UHS2 Termination */
ret = pci_read_config_dword(chip->pdev, O2_SD_FUNC_REG3, &scratch_32);
if (ret)
return;
scratch_32 &= ~((1 << 21) | (1 << 30));
pci_write_config_dword(chip->pdev, O2_SD_FUNC_REG3, scratch_32);
/* Set L1 Entrance Timer */
ret = pci_read_config_dword(chip->pdev, O2_SD_CAPS, &scratch_32);
if (ret)
return;
scratch_32 &= ~(0xf0000000);
scratch_32 |= 0x30000000;
pci_write_config_dword(chip->pdev, O2_SD_CAPS, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_MISC_CTRL4, &scratch_32);
if (ret)
return;
scratch_32 &= ~(0x000f0000);
scratch_32 |= 0x00080000;
pci_write_config_dword(chip->pdev, O2_SD_MISC_CTRL4, scratch_32);
}
int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
{
struct sdhci_pci_chip *chip;
struct sdhci_host *host;
u32 reg;
int ret;
chip = slot->chip;
host = slot->host;
switch (chip->pdev->device) {
case PCI_DEVICE_ID_O2_SDS0:
case PCI_DEVICE_ID_O2_SEABIRD0:
case PCI_DEVICE_ID_O2_SEABIRD1:
case PCI_DEVICE_ID_O2_SDS1:
case PCI_DEVICE_ID_O2_FUJIN2:
reg = sdhci_readl(host, O2_SD_VENDOR_SETTING);
if (reg & 0x1)
host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
ret = pci_read_config_dword(chip->pdev,
O2_SD_MISC_SETTING, &reg);
if (ret)
return -EIO;
if (reg & (1 << 4)) {
pr_info("%s: emmc 1.8v flag is set, force 1.8v signaling voltage\n",
mmc_hostname(host->mmc));
host->flags &= ~SDHCI_SIGNALING_330;
host->flags |= SDHCI_SIGNALING_180;
host->mmc->caps2 |= MMC_CAP2_NO_SD;
host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
}
}
if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2)
break;
/* set dll watch dog timer */
reg = sdhci_readl(host, O2_SD_VENDOR_SETTING2);
reg |= (1 << 12);
sdhci_writel(host, reg, O2_SD_VENDOR_SETTING2);
break;
default:
break;
}
return 0;
}
int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
{
int ret;
u8 scratch;
u32 scratch_32;
switch (chip->pdev->device) {
case PCI_DEVICE_ID_O2_8220:
case PCI_DEVICE_ID_O2_8221:
case PCI_DEVICE_ID_O2_8320:
case PCI_DEVICE_ID_O2_8321:
/* This extra setup is required due to broken ADMA. */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch &= 0x7f;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
/* Set Multi 3 to VCC3V# */
pci_write_config_byte(chip->pdev, O2_SD_MULTI_VCC3V, 0x08);
/* Disable CLK_REQ# support after media DET */
ret = pci_read_config_byte(chip->pdev,
O2_SD_CLKREQ, &scratch);
if (ret)
return ret;
scratch |= 0x20;
pci_write_config_byte(chip->pdev, O2_SD_CLKREQ, scratch);
/* Choose capabilities, enable SDMA. We have to write 0x01
* to the capabilities register first to unlock it.
*/
ret = pci_read_config_byte(chip->pdev, O2_SD_CAPS, &scratch);
if (ret)
return ret;
scratch |= 0x01;
pci_write_config_byte(chip->pdev, O2_SD_CAPS, scratch);
pci_write_config_byte(chip->pdev, O2_SD_CAPS, 0x73);
/* Disable ADMA1/2 */
pci_write_config_byte(chip->pdev, O2_SD_ADMA1, 0x39);
pci_write_config_byte(chip->pdev, O2_SD_ADMA2, 0x08);
/* Disable the infinite transfer mode */
ret = pci_read_config_byte(chip->pdev,
O2_SD_INF_MOD, &scratch);
if (ret)
return ret;
scratch |= 0x08;
pci_write_config_byte(chip->pdev, O2_SD_INF_MOD, scratch);
/* Lock WP */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch |= 0x80;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
break;
case PCI_DEVICE_ID_O2_SDS0:
case PCI_DEVICE_ID_O2_SDS1:
case PCI_DEVICE_ID_O2_FUJIN2:
/* UnLock WP */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch &= 0x7f;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
/* DevId=8520 subId= 0x11 or 0x12 Type Chip support */
if (chip->pdev->device == PCI_DEVICE_ID_O2_FUJIN2) {
ret = pci_read_config_dword(chip->pdev,
O2_SD_FUNC_REG0,
&scratch_32);
scratch_32 = ((scratch_32 & 0xFF000000) >> 24);
/* Check Whether subId is 0x11 or 0x12 */
if ((scratch_32 == 0x11) || (scratch_32 == 0x12)) {
scratch_32 = 0x2c280000;
/* Set Base Clock to 208MZ */
o2_pci_set_baseclk(chip, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_FUNC_REG4,
&scratch_32);
/* Enable Base Clk setting change */
scratch_32 |= O2_SD_FREG4_ENABLE_CLK_SET;
pci_write_config_dword(chip->pdev,
O2_SD_FUNC_REG4,
scratch_32);
/* Set Tuning Window to 4 */
pci_write_config_byte(chip->pdev,
O2_SD_TUNING_CTRL, 0x44);
break;
}
}
/* Enable 8520 led function */
o2_pci_led_enable(chip);
/* Set timeout CLK */
ret = pci_read_config_dword(chip->pdev,
O2_SD_CLK_SETTING, &scratch_32);
if (ret)
return ret;
scratch_32 &= ~(0xFF00);
scratch_32 |= 0x07E0C800;
pci_write_config_dword(chip->pdev,
O2_SD_CLK_SETTING, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_CLKREQ, &scratch_32);
if (ret)
return ret;
scratch_32 |= 0x3;
pci_write_config_dword(chip->pdev, O2_SD_CLKREQ, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_PLL_SETTING, &scratch_32);
if (ret)
return ret;
scratch_32 &= ~(0x1F3F070E);
scratch_32 |= 0x18270106;
pci_write_config_dword(chip->pdev,
O2_SD_PLL_SETTING, scratch_32);
/* Disable UHS1 funciton */
ret = pci_read_config_dword(chip->pdev,
O2_SD_CAP_REG2, &scratch_32);
if (ret)
return ret;
scratch_32 &= ~(0xE0);
pci_write_config_dword(chip->pdev,
O2_SD_CAP_REG2, scratch_32);
if (chip->pdev->device == PCI_DEVICE_ID_O2_FUJIN2)
sdhci_pci_o2_fujin2_pci_init(chip);
/* Lock WP */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch |= 0x80;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
break;
case PCI_DEVICE_ID_O2_SEABIRD0:
case PCI_DEVICE_ID_O2_SEABIRD1:
/* UnLock WP */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch &= 0x7f;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
ret = pci_read_config_dword(chip->pdev,
O2_SD_PLL_SETTING, &scratch_32);
if ((scratch_32 & 0xff000000) == 0x01000000) {
scratch_32 &= 0x0000FFFF;
scratch_32 |= 0x1F340000;
pci_write_config_dword(chip->pdev,
O2_SD_PLL_SETTING, scratch_32);
} else {
scratch_32 &= 0x0000FFFF;
scratch_32 |= 0x2c280000;
pci_write_config_dword(chip->pdev,
O2_SD_PLL_SETTING, scratch_32);
ret = pci_read_config_dword(chip->pdev,
O2_SD_FUNC_REG4,
&scratch_32);
scratch_32 |= (1 << 22);
pci_write_config_dword(chip->pdev,
O2_SD_FUNC_REG4, scratch_32);
}
/* Set Tuning Windows to 5 */
pci_write_config_byte(chip->pdev,
O2_SD_TUNING_CTRL, 0x55);
/* Lock WP */
ret = pci_read_config_byte(chip->pdev,
O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch |= 0x80;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
break;
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
int sdhci_pci_o2_resume(struct sdhci_pci_chip *chip)
{
sdhci_pci_o2_probe(chip);
return sdhci_pci_resume_host(chip);
}
#endif
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