diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/spi/spi-rspi.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/spi/spi-rspi.c | 521 |
1 files changed, 0 insertions, 521 deletions
diff --git a/ANDROID_3.4.5/drivers/spi/spi-rspi.c b/ANDROID_3.4.5/drivers/spi/spi-rspi.c deleted file mode 100644 index 354f170e..00000000 --- a/ANDROID_3.4.5/drivers/spi/spi-rspi.c +++ /dev/null @@ -1,521 +0,0 @@ -/* - * SH RSPI driver - * - * Copyright (C) 2012 Renesas Solutions Corp. - * - * Based on spi-sh.c: - * Copyright (C) 2011 Renesas Solutions Corp. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/errno.h> -#include <linux/list.h> -#include <linux/workqueue.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/clk.h> -#include <linux/spi/spi.h> - -#define RSPI_SPCR 0x00 -#define RSPI_SSLP 0x01 -#define RSPI_SPPCR 0x02 -#define RSPI_SPSR 0x03 -#define RSPI_SPDR 0x04 -#define RSPI_SPSCR 0x08 -#define RSPI_SPSSR 0x09 -#define RSPI_SPBR 0x0a -#define RSPI_SPDCR 0x0b -#define RSPI_SPCKD 0x0c -#define RSPI_SSLND 0x0d -#define RSPI_SPND 0x0e -#define RSPI_SPCR2 0x0f -#define RSPI_SPCMD0 0x10 -#define RSPI_SPCMD1 0x12 -#define RSPI_SPCMD2 0x14 -#define RSPI_SPCMD3 0x16 -#define RSPI_SPCMD4 0x18 -#define RSPI_SPCMD5 0x1a -#define RSPI_SPCMD6 0x1c -#define RSPI_SPCMD7 0x1e - -/* SPCR */ -#define SPCR_SPRIE 0x80 -#define SPCR_SPE 0x40 -#define SPCR_SPTIE 0x20 -#define SPCR_SPEIE 0x10 -#define SPCR_MSTR 0x08 -#define SPCR_MODFEN 0x04 -#define SPCR_TXMD 0x02 -#define SPCR_SPMS 0x01 - -/* SSLP */ -#define SSLP_SSL1P 0x02 -#define SSLP_SSL0P 0x01 - -/* SPPCR */ -#define SPPCR_MOIFE 0x20 -#define SPPCR_MOIFV 0x10 -#define SPPCR_SPOM 0x04 -#define SPPCR_SPLP2 0x02 -#define SPPCR_SPLP 0x01 - -/* SPSR */ -#define SPSR_SPRF 0x80 -#define SPSR_SPTEF 0x20 -#define SPSR_PERF 0x08 -#define SPSR_MODF 0x04 -#define SPSR_IDLNF 0x02 -#define SPSR_OVRF 0x01 - -/* SPSCR */ -#define SPSCR_SPSLN_MASK 0x07 - -/* SPSSR */ -#define SPSSR_SPECM_MASK 0x70 -#define SPSSR_SPCP_MASK 0x07 - -/* SPDCR */ -#define SPDCR_SPLW 0x20 -#define SPDCR_SPRDTD 0x10 -#define SPDCR_SLSEL1 0x08 -#define SPDCR_SLSEL0 0x04 -#define SPDCR_SLSEL_MASK 0x0c -#define SPDCR_SPFC1 0x02 -#define SPDCR_SPFC0 0x01 - -/* SPCKD */ -#define SPCKD_SCKDL_MASK 0x07 - -/* SSLND */ -#define SSLND_SLNDL_MASK 0x07 - -/* SPND */ -#define SPND_SPNDL_MASK 0x07 - -/* SPCR2 */ -#define SPCR2_PTE 0x08 -#define SPCR2_SPIE 0x04 -#define SPCR2_SPOE 0x02 -#define SPCR2_SPPE 0x01 - -/* SPCMDn */ -#define SPCMD_SCKDEN 0x8000 -#define SPCMD_SLNDEN 0x4000 -#define SPCMD_SPNDEN 0x2000 -#define SPCMD_LSBF 0x1000 -#define SPCMD_SPB_MASK 0x0f00 -#define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK) -#define SPCMD_SPB_20BIT 0x0000 -#define SPCMD_SPB_24BIT 0x0100 -#define SPCMD_SPB_32BIT 0x0200 -#define SPCMD_SSLKP 0x0080 -#define SPCMD_SSLA_MASK 0x0030 -#define SPCMD_BRDV_MASK 0x000c -#define SPCMD_CPOL 0x0002 -#define SPCMD_CPHA 0x0001 - -struct rspi_data { - void __iomem *addr; - u32 max_speed_hz; - struct spi_master *master; - struct list_head queue; - struct work_struct ws; - wait_queue_head_t wait; - spinlock_t lock; - struct clk *clk; - unsigned char spsr; -}; - -static void rspi_write8(struct rspi_data *rspi, u8 data, u16 offset) -{ - iowrite8(data, rspi->addr + offset); -} - -static void rspi_write16(struct rspi_data *rspi, u16 data, u16 offset) -{ - iowrite16(data, rspi->addr + offset); -} - -static u8 rspi_read8(struct rspi_data *rspi, u16 offset) -{ - return ioread8(rspi->addr + offset); -} - -static u16 rspi_read16(struct rspi_data *rspi, u16 offset) -{ - return ioread16(rspi->addr + offset); -} - -static unsigned char rspi_calc_spbr(struct rspi_data *rspi) -{ - int tmp; - unsigned char spbr; - - tmp = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1; - spbr = clamp(tmp, 0, 255); - - return spbr; -} - -static void rspi_enable_irq(struct rspi_data *rspi, u8 enable) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR); -} - -static void rspi_disable_irq(struct rspi_data *rspi, u8 disable) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR); -} - -static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask, - u8 enable_bit) -{ - int ret; - - rspi->spsr = rspi_read8(rspi, RSPI_SPSR); - rspi_enable_irq(rspi, enable_bit); - ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ); - if (ret == 0 && !(rspi->spsr & wait_mask)) - return -ETIMEDOUT; - - return 0; -} - -static void rspi_assert_ssl(struct rspi_data *rspi) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR); -} - -static void rspi_negate_ssl(struct rspi_data *rspi) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR); -} - -static int rspi_set_config_register(struct rspi_data *rspi, int access_size) -{ - /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */ - rspi_write8(rspi, 0x00, RSPI_SPPCR); - - /* Sets transfer bit rate */ - rspi_write8(rspi, rspi_calc_spbr(rspi), RSPI_SPBR); - - /* Sets number of frames to be used: 1 frame */ - rspi_write8(rspi, 0x00, RSPI_SPDCR); - - /* Sets RSPCK, SSL, next-access delay value */ - rspi_write8(rspi, 0x00, RSPI_SPCKD); - rspi_write8(rspi, 0x00, RSPI_SSLND); - rspi_write8(rspi, 0x00, RSPI_SPND); - - /* Sets parity, interrupt mask */ - rspi_write8(rspi, 0x00, RSPI_SPCR2); - - /* Sets SPCMD */ - rspi_write16(rspi, SPCMD_SPB_8_TO_16(access_size) | SPCMD_SSLKP, - RSPI_SPCMD0); - - /* Sets RSPI mode */ - rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR); - - return 0; -} - -static int rspi_send_pio(struct rspi_data *rspi, struct spi_message *mesg, - struct spi_transfer *t) -{ - int remain = t->len; - u8 *data; - - data = (u8 *)t->tx_buf; - while (remain > 0) { - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, - RSPI_SPCR); - - if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) { - dev_err(&rspi->master->dev, - "%s: tx empty timeout\n", __func__); - return -ETIMEDOUT; - } - - rspi_write16(rspi, *data, RSPI_SPDR); - data++; - remain--; - } - - /* Waiting for the last transmition */ - rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); - - return 0; -} - -static int rspi_receive_pio(struct rspi_data *rspi, struct spi_message *mesg, - struct spi_transfer *t) -{ - int remain = t->len; - u8 *data; - unsigned char spsr; - - spsr = rspi_read8(rspi, RSPI_SPSR); - if (spsr & SPSR_SPRF) - rspi_read16(rspi, RSPI_SPDR); /* dummy read */ - if (spsr & SPSR_OVRF) - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF, - RSPI_SPCR); - - data = (u8 *)t->rx_buf; - while (remain > 0) { - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, - RSPI_SPCR); - - if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) { - dev_err(&rspi->master->dev, - "%s: tx empty timeout\n", __func__); - return -ETIMEDOUT; - } - /* dummy write for generate clock */ - rspi_write16(rspi, 0x00, RSPI_SPDR); - - if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) { - dev_err(&rspi->master->dev, - "%s: receive timeout\n", __func__); - return -ETIMEDOUT; - } - /* SPDR allows 16 or 32-bit access only */ - *data = (u8)rspi_read16(rspi, RSPI_SPDR); - - data++; - remain--; - } - - return 0; -} - -static void rspi_work(struct work_struct *work) -{ - struct rspi_data *rspi = container_of(work, struct rspi_data, ws); - struct spi_message *mesg; - struct spi_transfer *t; - unsigned long flags; - int ret; - - spin_lock_irqsave(&rspi->lock, flags); - while (!list_empty(&rspi->queue)) { - mesg = list_entry(rspi->queue.next, struct spi_message, queue); - list_del_init(&mesg->queue); - spin_unlock_irqrestore(&rspi->lock, flags); - - rspi_assert_ssl(rspi); - - list_for_each_entry(t, &mesg->transfers, transfer_list) { - if (t->tx_buf) { - ret = rspi_send_pio(rspi, mesg, t); - if (ret < 0) - goto error; - } - if (t->rx_buf) { - ret = rspi_receive_pio(rspi, mesg, t); - if (ret < 0) - goto error; - } - mesg->actual_length += t->len; - } - rspi_negate_ssl(rspi); - - mesg->status = 0; - mesg->complete(mesg->context); - - spin_lock_irqsave(&rspi->lock, flags); - } - - return; - -error: - mesg->status = ret; - mesg->complete(mesg->context); -} - -static int rspi_setup(struct spi_device *spi) -{ - struct rspi_data *rspi = spi_master_get_devdata(spi->master); - - if (!spi->bits_per_word) - spi->bits_per_word = 8; - rspi->max_speed_hz = spi->max_speed_hz; - - rspi_set_config_register(rspi, 8); - - return 0; -} - -static int rspi_transfer(struct spi_device *spi, struct spi_message *mesg) -{ - struct rspi_data *rspi = spi_master_get_devdata(spi->master); - unsigned long flags; - - mesg->actual_length = 0; - mesg->status = -EINPROGRESS; - - spin_lock_irqsave(&rspi->lock, flags); - list_add_tail(&mesg->queue, &rspi->queue); - schedule_work(&rspi->ws); - spin_unlock_irqrestore(&rspi->lock, flags); - - return 0; -} - -static void rspi_cleanup(struct spi_device *spi) -{ -} - -static irqreturn_t rspi_irq(int irq, void *_sr) -{ - struct rspi_data *rspi = (struct rspi_data *)_sr; - unsigned long spsr; - irqreturn_t ret = IRQ_NONE; - unsigned char disable_irq = 0; - - rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); - if (spsr & SPSR_SPRF) - disable_irq |= SPCR_SPRIE; - if (spsr & SPSR_SPTEF) - disable_irq |= SPCR_SPTIE; - - if (disable_irq) { - ret = IRQ_HANDLED; - rspi_disable_irq(rspi, disable_irq); - wake_up(&rspi->wait); - } - - return ret; -} - -static int __devexit rspi_remove(struct platform_device *pdev) -{ - struct rspi_data *rspi = dev_get_drvdata(&pdev->dev); - - spi_unregister_master(rspi->master); - free_irq(platform_get_irq(pdev, 0), rspi); - clk_put(rspi->clk); - iounmap(rspi->addr); - spi_master_put(rspi->master); - - return 0; -} - -static int __devinit rspi_probe(struct platform_device *pdev) -{ - struct resource *res; - struct spi_master *master; - struct rspi_data *rspi; - int ret, irq; - char clk_name[16]; - - /* get base addr */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (unlikely(res == NULL)) { - dev_err(&pdev->dev, "invalid resource\n"); - return -EINVAL; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "platform_get_irq error\n"); - return -ENODEV; - } - - master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data)); - if (master == NULL) { - dev_err(&pdev->dev, "spi_alloc_master error.\n"); - return -ENOMEM; - } - - rspi = spi_master_get_devdata(master); - dev_set_drvdata(&pdev->dev, rspi); - - rspi->master = master; - rspi->addr = ioremap(res->start, resource_size(res)); - if (rspi->addr == NULL) { - dev_err(&pdev->dev, "ioremap error.\n"); - ret = -ENOMEM; - goto error1; - } - - snprintf(clk_name, sizeof(clk_name), "rspi%d", pdev->id); - rspi->clk = clk_get(&pdev->dev, clk_name); - if (IS_ERR(rspi->clk)) { - dev_err(&pdev->dev, "cannot get clock\n"); - ret = PTR_ERR(rspi->clk); - goto error2; - } - clk_enable(rspi->clk); - - INIT_LIST_HEAD(&rspi->queue); - spin_lock_init(&rspi->lock); - INIT_WORK(&rspi->ws, rspi_work); - init_waitqueue_head(&rspi->wait); - - master->num_chipselect = 2; - master->bus_num = pdev->id; - master->setup = rspi_setup; - master->transfer = rspi_transfer; - master->cleanup = rspi_cleanup; - - ret = request_irq(irq, rspi_irq, 0, dev_name(&pdev->dev), rspi); - if (ret < 0) { - dev_err(&pdev->dev, "request_irq error\n"); - goto error3; - } - - ret = spi_register_master(master); - if (ret < 0) { - dev_err(&pdev->dev, "spi_register_master error.\n"); - goto error4; - } - - dev_info(&pdev->dev, "probed\n"); - - return 0; - -error4: - free_irq(irq, rspi); -error3: - clk_put(rspi->clk); -error2: - iounmap(rspi->addr); -error1: - spi_master_put(master); - - return ret; -} - -static struct platform_driver rspi_driver = { - .probe = rspi_probe, - .remove = __devexit_p(rspi_remove), - .driver = { - .name = "rspi", - .owner = THIS_MODULE, - }, -}; -module_platform_driver(rspi_driver); - -MODULE_DESCRIPTION("Renesas RSPI bus driver"); -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Yoshihiro Shimoda"); -MODULE_ALIAS("platform:rspi"); |