Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753896AbcLGAPj (ORCPT ); Tue, 6 Dec 2016 19:15:39 -0500 Received: from mail-oi0-f65.google.com ([209.85.218.65]:34099 "EHLO mail-oi0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753040AbcLGAPS (ORCPT ); Tue, 6 Dec 2016 19:15:18 -0500 From: Chris Bostic To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, gregkh@linuxfoundation.org, sre@kernel.org, mturquette@baylibre.com, geert+renesas@glider.be, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Jeremy Kerr , joel@jms.id.au, linux-kernel@vger.kernel.org, andrew@aj.id.au, alistair@popple.id.au, benh@kernel.crashing.org, Chris Bostic Subject: [PATCH 10/16] drivers/fsi: scan slaves & register devices Date: Tue, 6 Dec 2016 18:14:31 -0600 Message-Id: <1481069677-53660-11-git-send-email-christopher.lee.bostic@gmail.com> X-Mailer: git-send-email 2.7.4 (Apple Git-66) In-Reply-To: <1481069677-53660-1-git-send-email-christopher.lee.bostic@gmail.com> References: <1481069677-53660-1-git-send-email-christopher.lee.bostic@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5089 Lines: 199 From: Jeremy Kerr Now that we have fsi_slave devices, scan each for endpoints, and register them on the fsi bus. Includes contributions from Chris Bostic Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic --- drivers/fsi/fsi-core.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++-- include/linux/fsi.h | 4 ++ 2 files changed, 136 insertions(+), 4 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index aa4330a..b51ea35 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -21,9 +21,19 @@ #include "fsi-master.h" #define FSI_N_SLAVES 4 -#define FSI_SLAVE_CONF_CRC_SHIFT 4 -#define FSI_SLAVE_CONF_CRC_MASK 0x0000000f -#define FSI_SLAVE_CONF_DATA_BITS 28 + +#define FSI_SLAVE_CONF_NEXT_MASK 0x80000000 +#define FSI_SLAVE_CONF_SLOTS_MASK 0x00ff0000 +#define FSI_SLAVE_CONF_SLOTS_SHIFT 16 +#define FSI_SLAVE_CONF_VERSION_MASK 0x0000f000 +#define FSI_SLAVE_CONF_VERSION_SHIFT 12 +#define FSI_SLAVE_CONF_TYPE_MASK 0x00000ff0 +#define FSI_SLAVE_CONF_TYPE_SHIFT 4 +#define FSI_SLAVE_CONF_CRC_SHIFT 4 +#define FSI_SLAVE_CONF_CRC_MASK 0x0000000f +#define FSI_SLAVE_CONF_DATA_BITS 28 + +static const int engine_page_size = 0x400; static atomic_t master_idx = ATOMIC_INIT(-1); @@ -36,6 +46,30 @@ struct fsi_slave { #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) +/* FSI endpoint-device support */ + +static void fsi_device_release(struct device *_device) +{ + struct fsi_device *device = to_fsi_dev(_device); + + kfree(device); +} + +static struct fsi_device *fsi_create_device(struct fsi_slave *slave) +{ + struct fsi_device *dev; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + dev->dev.parent = &slave->dev; + dev->dev.bus = &fsi_bus_type; + dev->dev.release = fsi_device_release; + + return dev; +} + /* crc helpers */ static const uint8_t crc4_tab[] = { 0x0, 0x7, 0xe, 0x9, 0xb, 0xc, 0x5, 0x2, @@ -59,6 +93,99 @@ uint8_t fsi_crc4(uint8_t c, uint64_t x, int bits) /* FSI slave support */ +static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, + void *val, size_t size) +{ + return slave->master->read(slave->master, slave->link, + slave->id, addr, val, size); +} + +static int fsi_slave_scan(struct fsi_slave *slave) +{ + uint32_t engine_addr; + uint32_t conf; + int rc, i; + + /* + * scan engines + * + * We keep the peek mode and slave engines for the core; so start + * at the third slot in the configuration table. We also need to + * skip the chip ID entry at the start of the address space. + */ + engine_addr = engine_page_size * 3; + for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { + uint8_t slots, version, type, crc; + struct fsi_device *dev; + + rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), + &conf, sizeof(conf)); + if (rc) { + dev_warn(&slave->dev, + "error reading slave registers\n"); + return -1; + } + + crc = fsi_crc4(0, conf >> FSI_SLAVE_CONF_CRC_SHIFT, + FSI_SLAVE_CONF_DATA_BITS); + if (crc != (conf & FSI_SLAVE_CONF_CRC_MASK)) { + dev_warn(&slave->dev, + "crc error in slave register at 0x%04x\n", + i); + return -1; + } + + slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) + >> FSI_SLAVE_CONF_SLOTS_SHIFT; + version = (conf & FSI_SLAVE_CONF_VERSION_MASK) + >> FSI_SLAVE_CONF_VERSION_SHIFT; + type = (conf & FSI_SLAVE_CONF_TYPE_MASK) + >> FSI_SLAVE_CONF_TYPE_SHIFT; + + /* + * Unused address areas are marked by a zero type value; this + * skips the defined address areas + */ + if (type != 0) { + + /* create device */ + dev = fsi_create_device(slave); + if (!dev) + return -ENOMEM; + + dev->slave = slave; + dev->engine_type = type; + dev->version = version; + dev->unit = i; + dev->addr = engine_addr; + dev->size = slots * engine_page_size; + + dev_info(&slave->dev, + "engine[%i]: type %x, version %x, addr %x size %x\n", + dev->unit, dev->engine_type, version, + dev->addr, dev->size); + + device_initialize(&dev->dev); + dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", + slave->master->idx, slave->link, + slave->id, i - 2); + + rc = device_add(&dev->dev); + if (rc) { + dev_warn(&slave->dev, "add failed: %d\n", rc); + put_device(&dev->dev); + } + } + + engine_addr += slots * engine_page_size; + + if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) + break; + } + + return 0; +} + static void fsi_slave_release(struct device *dev) { struct fsi_slave *slave = to_fsi_slave(dev); @@ -110,7 +237,8 @@ static int fsi_slave_init(struct fsi_master *master, return rc; } - return rc; + fsi_slave_scan(slave); + return 0; } /* FSI master support */ diff --git a/include/linux/fsi.h b/include/linux/fsi.h index 273cbf6..efa55ba 100644 --- a/include/linux/fsi.h +++ b/include/linux/fsi.h @@ -21,6 +21,10 @@ struct fsi_device { struct device dev; u8 engine_type; u8 version; + u8 unit; + struct fsi_slave *slave; + uint32_t addr; + uint32_t size; }; struct fsi_device_id { -- 1.8.2.2