From patchwork Tue Feb 15 09:35:02 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arindam Nath X-Patchwork-Id: 558431 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p1F9c1qr027319 for ; Tue, 15 Feb 2011 09:38:03 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754555Ab1BOJiD (ORCPT ); Tue, 15 Feb 2011 04:38:03 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:53726 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754297Ab1BOJiB (ORCPT ); Tue, 15 Feb 2011 04:38:01 -0500 Received: by mail-iy0-f174.google.com with SMTP id 8so5730570iyj.19 for ; Tue, 15 Feb 2011 01:38:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:sender:from:to:cc:subject:date:message-id :x-mailer:in-reply-to:references; bh=jCZ/nds0xkbB+z6xbT+q8W7e3nGWwq/l4NC4wYR3JWo=; b=NiJMMz0E9RcQYezMixQe49PcZSzkpOWqvPQu8abR+EqUAbkJRgJ75pmC911XOV1RIK n8NfP256PbCojyvMlz0ulJotILhCR7U8TuTO/K1zjuCPfowCrNKfRGy/I+XvVcuUfLdP ejMpLSGYiljVGnp7TcNtsSU7ePC7Eh5xK58HU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references; b=cq/fRB/q2Zfu2TFkJQ7DyS28YWbTSFIqccEIAx4wmVmAw1jXa/Vvm8RPDC8SB0lRYp lNQ4N7FiNgp6JUQS+TzIOCagncfEn9OalZUSOBptojVB+OCtWeFbqmdIZfbImQjSRgNc cnLZZW/AzH8QbrJc4Cva7B8VpJUieRVsoGgPk= Received: by 10.42.240.3 with SMTP id ky3mr6460044icb.354.1297762617454; Tue, 15 Feb 2011 01:36:57 -0800 (PST) Received: from localhost ([122.167.0.108]) by mx.google.com with ESMTPS id gy41sm3441995ibb.17.2011.02.15.01.36.50 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 15 Feb 2011 01:36:56 -0800 (PST) From: Arindam Nath To: cjb@laptop.org Cc: linux-mmc@vger.kernel.org, henry.su@amd.com, aaron.lu@amd.com, anath.amd@gmail.com, Arindam Nath Subject: [PATCH 04/12] mmc: sd: add support for driver type selection Date: Tue, 15 Feb 2011 15:05:02 +0530 Message-Id: <1297762510-2696-5-git-send-email-arindam.nath@amd.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1297762510-2696-1-git-send-email-arindam.nath@amd.com> References: <1297762510-2696-1-git-send-email-arindam.nath@amd.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Tue, 15 Feb 2011 09:38:03 +0000 (UTC) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 6625c05..daa535a 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -947,6 +947,15 @@ void mmc_set_timing(struct mmc_host *host, unsigned int timing) } /* + * Select appropriate driver type for host. + */ +void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) +{ + host->ios.drv_type = drv_type; + mmc_set_ios(host); +} + +/* * Apply power to the MMC stack. This is a two-stage process. * First, we enable power to the card without the clock running. * We then wait a bit for the power to stabilise. Finally, diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h index ca1fdde..6114ca5 100644 --- a/drivers/mmc/core/core.h +++ b/drivers/mmc/core/core.h @@ -42,6 +42,7 @@ void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width, unsigned int ddr); u32 mmc_select_voltage(struct mmc_host *host, u32 ocr); void mmc_set_timing(struct mmc_host *host, unsigned int timing); +void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type); static inline void mmc_delay(unsigned int ms) { diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 2a84396..9e4574d 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -426,6 +426,86 @@ out: return err; } +static int sd_select_driver_type(struct mmc_card *card, u8 *status) +{ + int host_set_drv_type, card_set_drv_type; + int err; + + /* + * If the host doesn't support any of the Driver Types A,C or D, + * default Driver Type B is used. + */ + if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C + | MMC_CAP_DRIVER_TYPE_D))) + return 0; + + if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) { + host_set_drv_type = MMC_SET_DRIVER_TYPE_A; + if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_A) + card_set_drv_type = MMC_SET_DRIVER_TYPE_A; + else if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_C) + card_set_drv_type = MMC_SET_DRIVER_TYPE_C; + } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) { + host_set_drv_type = MMC_SET_DRIVER_TYPE_C; + if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_C) + card_set_drv_type = MMC_SET_DRIVER_TYPE_C; + } + + err = mmc_sd_switch(card, 1, 2, card_set_drv_type, status); + if (err) + return err; + + if ((status[15] & 0xF) != card_set_drv_type) + printk(KERN_WARNING "%s: Problem setting driver strength!\n", + mmc_hostname(card->host)); + else + mmc_set_driver_type(card->host, host_set_drv_type); + + return 0; +} + +/* + * UHS-I specific initialization procedure + */ +static int mmc_sd_init_uhs_card(struct mmc_card *card) +{ + int err; + u8 *status; + + if (!card->scr.sda_spec3) + return 0; + + if (!(card->csd.cmdclass & CCC_SWITCH)) + return 0; + + err = -EIO; + + status = kmalloc(64, GFP_KERNEL); + if (!status) { + printk(KERN_ERR "%s: could not allocate a buffer for " + "switch capabilities.\n", mmc_hostname(card->host)); + return -ENOMEM; + } + + /* Set 4-bit bus width */ + if ((card->host->caps & MMC_CAP_4_BIT_DATA) && + (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { + err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); + if (err) + goto out; + + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); + } + + /* Set the driver strength for the card */ + err = sd_select_driver_type(card, status); + +out: + kfree(status); + + return err; +} + MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], card->raw_cid[2], card->raw_cid[3]); MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], @@ -474,10 +554,10 @@ struct device_type sd_type = { /* * Fetch CID from card. */ -int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) +int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, + u32 *rocr) { int err; - u32 rocr; /* * Since we're changing the OCR value, we seem to @@ -502,7 +582,7 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) MMC_CAP_SET_XPC_180)) ocr |= 1 << 28; - err = mmc_send_app_op_cond(host, ocr, &rocr); + err = mmc_send_app_op_cond(host, ocr, rocr); if (err) return err; @@ -510,7 +590,7 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) * In case CCS and S18A in the response is set, start Signal Voltage * Switch procedure. SPI mode doesn't support CMD11. */ - if (!mmc_host_is_spi(host) && (rocr & 0x41000000)) { + if (!mmc_host_is_spi(host) && rocr && (*rocr & 0x41000000)) { err = mmc_start_voltage_switch(host); if (err) return err; @@ -643,11 +723,12 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, struct mmc_card *card; int err; u32 cid[4]; + u32 rocr; BUG_ON(!host); WARN_ON(!host->claimed); - err = mmc_sd_get_cid(host, ocr, cid); + err = mmc_sd_get_cid(host, ocr, cid, &rocr); if (err) return err; @@ -700,30 +781,37 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, if (err) goto free_card; - /* - * Attempt to change to high-speed (if supported) - */ - err = mmc_sd_switch_hs(card); - if (err > 0) - mmc_sd_go_highspeed(card); - else if (err) - goto free_card; - - /* - * Set bus speed. - */ - mmc_set_clock(host, mmc_sd_get_max_clock(card)); - - /* - * Switch to wider bus (if supported). - */ - if ((host->caps & MMC_CAP_4_BIT_DATA) && - (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { - err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); + /* Initialization sequence for UHS-I cards */ + if (rocr & 0x01000000) { + err = mmc_sd_init_uhs_card(card); if (err) goto free_card; + } else { + /* + * Attempt to change to high-speed (if supported) + */ + err = mmc_sd_switch_hs(card); + if (err > 0) + mmc_sd_go_highspeed(card); + else if (err) + goto free_card; + + /* + * Set bus speed. + */ + mmc_set_clock(host, mmc_sd_get_max_clock(card)); - mmc_set_bus_width(host, MMC_BUS_WIDTH_4); + /* + * Switch to wider bus (if supported). + */ + if ((host->caps & MMC_CAP_4_BIT_DATA) && + (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { + err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); + if (err) + goto free_card; + + mmc_set_bus_width(host, MMC_BUS_WIDTH_4); + } } host->card = card; diff --git a/drivers/mmc/core/sd.h b/drivers/mmc/core/sd.h index 3d8800f..5106b44 100644 --- a/drivers/mmc/core/sd.h +++ b/drivers/mmc/core/sd.h @@ -5,7 +5,8 @@ extern struct device_type sd_type; -int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid); +int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, + u32 *rocr); int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card); void mmc_decode_cid(struct mmc_card *card); int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 5c4a54d..6d16684 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -364,7 +364,8 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, } if (ocr & R4_MEMORY_PRESENT - && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) { + && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, + NULL) == 0) { card->type = MMC_TYPE_SD_COMBO; if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6d7a276..b768839 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -65,7 +65,7 @@ static void sdhci_dumpregs(struct sdhci_host *host) sdhci_readw(host, SDHCI_TRANSFER_MODE)); printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n", sdhci_readl(host, SDHCI_PRESENT_STATE), - sdhci_readb(host, SDHCI_HOST_CONTROL)); + sdhci_readb(host, SDHCI_HOST_CONTROL1)); printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n", sdhci_readb(host, SDHCI_POWER_CONTROL), sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL)); @@ -218,18 +218,18 @@ static void sdhci_activate_led(struct sdhci_host *host) { u8 ctrl; - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1); ctrl |= SDHCI_CTRL_LED; - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1); } static void sdhci_deactivate_led(struct sdhci_host *host) { u8 ctrl; - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1); ctrl &= ~SDHCI_CTRL_LED; - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1); } #ifdef SDHCI_USE_LEDS_CLASS @@ -788,14 +788,14 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) * is ADMA. */ if (host->version >= SDHCI_SPEC_200) { - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1); ctrl &= ~SDHCI_CTRL_DMA_MASK; if ((host->flags & SDHCI_REQ_USE_DMA) && (host->flags & SDHCI_USE_ADMA)) ctrl |= SDHCI_CTRL_ADMA32; else ctrl |= SDHCI_CTRL_SDMA; - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1); } if (!(host->flags & SDHCI_REQ_USE_DMA)) { @@ -1255,7 +1255,7 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (host->ops->platform_8bit_width) host->ops->platform_8bit_width(host, ios->bus_width); else { - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1); if (ios->bus_width == MMC_BUS_WIDTH_8) { ctrl &= ~SDHCI_CTRL_4BITBUS; if (host->version >= SDHCI_SPEC_300) @@ -1268,10 +1268,10 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) else ctrl &= ~SDHCI_CTRL_4BITBUS; } - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1); } - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1); if ((ios->timing == MMC_TIMING_SD_HS || ios->timing == MMC_TIMING_MMC_HS) @@ -1280,7 +1280,25 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) else ctrl &= ~SDHCI_CTRL_HISPD; - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1); + + if (host->version >= SDHCI_SPEC_300) { + u16 ctrl_2; + + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) { + /* + * We only need to set Driver Strength if the + * preset value enable is not set. + */ + if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; + else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; + + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + } + } /* * Some (ENE) controllers go apeshit on some ios operation, @@ -2037,6 +2055,14 @@ int sdhci_add_host(struct sdhci_host *host) if (caps[1] & SDHCI_SUPPORT_DDR50) mmc->caps |= MMC_CAP_UHS_DDR50; + /* Driver Type(s) (A, C, D) supported by the host */ + if (caps[1] & SDHCI_DRIVER_TYPE_A) + mmc->caps |= MMC_CAP_DRIVER_TYPE_A; + if (caps[1] & SDHCI_DRIVER_TYPE_C) + mmc->caps |= MMC_CAP_DRIVER_TYPE_C; + if (caps[1] & SDHCI_DRIVER_TYPE_D) + mmc->caps |= MMC_CAP_DRIVER_TYPE_D; + ocr_avail = 0; /* * According to SD Host Controller spec v3.00, if the Host System diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 95d70e6..a407b5b 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -72,7 +72,7 @@ #define SDHCI_DATA_LVL_MASK 0x00F00000 #define SDHCI_DATA_LVL_SHIFT 20 -#define SDHCI_HOST_CONTROL 0x28 +#define SDHCI_HOST_CONTROL1 0x28 #define SDHCI_CTRL_LED 0x01 #define SDHCI_CTRL_4BITBUS 0x02 #define SDHCI_CTRL_HISPD 0x04 @@ -151,6 +151,11 @@ #define SDHCI_HOST_CONTROL2 0x3E #define SDHCI_CTRL_VDD_180 0x0008 +#define SDHCI_CTRL_DRV_TYPE_B 0x0000 +#define SDHCI_CTRL_DRV_TYPE_A 0x0010 +#define SDHCI_CTRL_DRV_TYPE_C 0x0020 +#define SDHCI_CTRL_DRV_TYPE_D 0x0030 +#define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 #define SDHCI_CAPABILITIES 0x40 #define SDHCI_TIMEOUT_CLK_MASK 0x0000003F @@ -174,6 +179,9 @@ #define SDHCI_SUPPORT_SDR50 0x00000001 #define SDHCI_SUPPORT_SDR104 0x00000002 #define SDHCI_SUPPORT_DDR50 0x00000004 +#define SDHCI_DRIVER_TYPE_A 0x00000010 +#define SDHCI_DRIVER_TYPE_C 0x00000020 +#define SDHCI_DRIVER_TYPE_D 0x00000040 #define SDHCI_CAPABILITIES_1 0x44 diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 7080f22..2d7f7a3 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -77,6 +77,10 @@ struct sd_switch_caps { unsigned int hs_max_dtr; unsigned int uhs_bus_mode; unsigned int uhs_drv_type; +#define SD_DRIVER_TYPE_B 0x01 +#define SD_DRIVER_TYPE_A 0x02 +#define SD_DRIVER_TYPE_C 0x04 +#define SD_DRIVER_TYPE_D 0x08 unsigned int uhs_curr_limit; }; diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index ec09b32..e6ae4c4 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -56,6 +56,11 @@ struct mmc_ios { #define MMC_SDR_MODE 0 #define MMC_1_2V_DDR_MODE 1 #define MMC_1_8V_DDR_MODE 2 + + unsigned char drv_type; /* driver type (A, C, D) */ + +#define MMC_SET_DRIVER_TYPE_A 1 +#define MMC_SET_DRIVER_TYPE_C 2 }; struct mmc_host_ops { @@ -181,6 +186,9 @@ struct mmc_host { #define MMC_CAP_SET_XPC_330 (1 << 18) /* Host supports >150mA current at 3.3V */ #define MMC_CAP_SET_XPC_300 (1 << 19) /* Host supports >150mA current at 3.0V */ #define MMC_CAP_SET_XPC_180 (1 << 20) /* Host supports >150mA current at 1.8V */ +#define MMC_CAP_DRIVER_TYPE_A (1 << 21) /* Host supports Driver Type A */ +#define MMC_CAP_DRIVER_TYPE_C (1 << 22) /* Host supports Driver Type C */ +#define MMC_CAP_DRIVER_TYPE_D (1 << 23) /* Host supports Driver Type D */ mmc_pm_flag_t pm_caps; /* supported pm features */