wl12xx: add driver

wl12xx is a driver for TI wl1251 802.11 chipset designed for embedded
devices, supporting both SDIO and SPI busses. Currently the driver
supports only SPI. Adding support 1253 (the 5 GHz version) should be
relatively easy. More information here:

http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?contentId=4711&navigationId=12494&templateId=6123

(Collapsed original sequence of pre-merge patches into single commit for
initial merge. -- JWL)

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/boot.c b/drivers/net/wireless/wl12xx/boot.c
new file mode 100644
index 00000000000..48ac08c429b
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/boot.c
@@ -0,0 +1,295 @@
+/*
+ * This file is part of wl12xx
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Kalle Valo <kalle.valo@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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/gpio.h>
+
+#include "reg.h"
+#include "boot.h"
+#include "spi.h"
+#include "event.h"
+
+static void wl12xx_boot_enable_interrupts(struct wl12xx *wl)
+{
+        enable_irq(wl->irq);
+}
+
+void wl12xx_boot_target_enable_interrupts(struct wl12xx *wl)
+{
+        wl12xx_reg_write32(wl, ACX_REG_INTERRUPT_MASK, ~(wl->intr_mask));
+        wl12xx_reg_write32(wl, HI_CFG, HI_CFG_DEF_VAL);
+}
+
+int wl12xx_boot_soft_reset(struct wl12xx *wl)
+{
+        unsigned long timeout;
+        u32 boot_data;
+
+        /* perform soft reset */
+        wl12xx_reg_write32(wl, ACX_REG_SLV_SOFT_RESET, ACX_SLV_SOFT_RESET_BIT);
+
+        /* SOFT_RESET is self clearing */
+        timeout = jiffies + usecs_to_jiffies(SOFT_RESET_MAX_TIME);
+        while (1) {
+                boot_data = wl12xx_reg_read32(wl, ACX_REG_SLV_SOFT_RESET);
+                wl12xx_debug(DEBUG_BOOT, "soft reset bootdata 0x%x", boot_data);
+                if ((boot_data & ACX_SLV_SOFT_RESET_BIT) == 0)
+                        break;
+
+                if (time_after(jiffies, timeout)) {
+                        /* 1.2 check pWhalBus->uSelfClearTime if the
+                         * timeout was reached */
+                        wl12xx_error("soft reset timeout");
+                        return -1;
+                }
+
+                udelay(SOFT_RESET_STALL_TIME);
+        }
+
+        /* disable Rx/Tx */
+        wl12xx_reg_write32(wl, ENABLE, 0x0);
+
+        /* disable auto calibration on start*/
+        wl12xx_reg_write32(wl, SPARE_A2, 0xffff);
+
+        return 0;
+}
+
+int wl12xx_boot_init_seq(struct wl12xx *wl)
+{
+        u32 scr_pad6, init_data, tmp, elp_cmd, ref_freq;
+
+        /*
+         * col #1: INTEGER_DIVIDER
+         * col #2: FRACTIONAL_DIVIDER
+         * col #3: ATTN_BB
+         * col #4: ALPHA_BB
+         * col #5: STOP_TIME_BB
+         * col #6: BB_PLL_LOOP_FILTER
+         */
+        static const u32 LUT[REF_FREQ_NUM][LUT_PARAM_NUM] = {
+
+                {   83, 87381,  0xB, 5, 0xF00,  3}, /* REF_FREQ_19_2*/
+                {   61, 141154, 0xB, 5, 0x1450, 2}, /* REF_FREQ_26_0*/
+                {   41, 174763, 0xC, 6, 0x2D00, 1}, /* REF_FREQ_38_4*/
+                {   40, 0,      0xC, 6, 0x2EE0, 1}, /* REF_FREQ_40_0*/
+                {   47, 162280, 0xC, 6, 0x2760, 1}  /* REF_FREQ_33_6        */
+        };
+
+        /* read NVS params */
+        scr_pad6 = wl12xx_reg_read32(wl, SCR_PAD6);
+        wl12xx_debug(DEBUG_BOOT, "scr_pad6 0x%x", scr_pad6);
+
+        /* read ELP_CMD */
+        elp_cmd = wl12xx_reg_read32(wl, ELP_CMD);
+        wl12xx_debug(DEBUG_BOOT, "elp_cmd 0x%x", elp_cmd);
+
+        /* set the BB calibration time to be 300 usec (PLL_CAL_TIME) */
+        ref_freq = scr_pad6 & 0x000000FF;
+        wl12xx_debug(DEBUG_BOOT, "ref_freq 0x%x", ref_freq);
+
+        wl12xx_reg_write32(wl, PLL_CAL_TIME, 0x9);
+
+        /*
+         * PG 1.2: set the clock buffer time to be 210 usec (CLK_BUF_TIME)
+         */
+        wl12xx_reg_write32(wl, CLK_BUF_TIME, 0x6);
+
+        /*
+         * set the clock detect feature to work in the restart wu procedure
+         * (ELP_CFG_MODE[14]) and Select the clock source type
+         * (ELP_CFG_MODE[13:12])
+         */
+        tmp = ((scr_pad6 & 0x0000FF00) << 4) | 0x00004000;
+        wl12xx_reg_write32(wl, ELP_CFG_MODE, tmp);
+
+        /* PG 1.2: enable the BB PLL fix. Enable the PLL_LIMP_CLK_EN_CMD */
+        elp_cmd |= 0x00000040;
+        wl12xx_reg_write32(wl, ELP_CMD, elp_cmd);
+
+        /* PG 1.2: Set the BB PLL stable time to be 1000usec
+         * (PLL_STABLE_TIME) */
+        wl12xx_reg_write32(wl, CFG_PLL_SYNC_CNT, 0x20);
+
+        /* PG 1.2: read clock request time */
+        init_data = wl12xx_reg_read32(wl, CLK_REQ_TIME);
+
+        /*
+         * PG 1.2: set the clock request time to be ref_clk_settling_time -
+         * 1ms = 4ms
+         */
+        if (init_data > 0x21)
+                tmp = init_data - 0x21;
+        else
+                tmp = 0;
+        wl12xx_reg_write32(wl, CLK_REQ_TIME, tmp);
+
+        /* set BB PLL configurations in RF AFE */
+        wl12xx_reg_write32(wl, 0x003058cc, 0x4B5);
+
+        /* set RF_AFE_REG_5 */
+        wl12xx_reg_write32(wl, 0x003058d4, 0x50);
+
+        /* set RF_AFE_CTRL_REG_2 */
+        wl12xx_reg_write32(wl, 0x00305948, 0x11c001);
+
+        /*
+         * change RF PLL and BB PLL divider for VCO clock and adjust VCO
+         * bais current(RF_AFE_REG_13)
+         */
+        wl12xx_reg_write32(wl, 0x003058f4, 0x1e);
+
+        /* set BB PLL configurations */
+        tmp = LUT[ref_freq][LUT_PARAM_INTEGER_DIVIDER] | 0x00017000;
+        wl12xx_reg_write32(wl, 0x00305840, tmp);
+
+        /* set fractional divider according to Appendix C-BB PLL
+         * Calculations
+         */
+        tmp = LUT[ref_freq][LUT_PARAM_FRACTIONAL_DIVIDER];
+        wl12xx_reg_write32(wl, 0x00305844, tmp);
+
+        /* set the initial data for the sigma delta */
+        wl12xx_reg_write32(wl, 0x00305848, 0x3039);
+
+        /*
+         * set the accumulator attenuation value, calibration loop1
+         * (alpha), calibration loop2 (beta), calibration loop3 (gamma) and
+         * the VCO gain
+         */
+        tmp = (LUT[ref_freq][LUT_PARAM_ATTN_BB] << 16) |
+                (LUT[ref_freq][LUT_PARAM_ALPHA_BB] << 12) | 0x1;
+        wl12xx_reg_write32(wl, 0x00305854, tmp);
+
+        /*
+         * set the calibration stop time after holdoff time expires and set
+         * settling time HOLD_OFF_TIME_BB
+         */
+        tmp = LUT[ref_freq][LUT_PARAM_STOP_TIME_BB] | 0x000A0000;
+        wl12xx_reg_write32(wl, 0x00305858, tmp);
+
+        /*
+         * set BB PLL Loop filter capacitor3- BB_C3[2:0] and set BB PLL
+         * constant leakage current to linearize PFD to 0uA -
+         * BB_ILOOPF[7:3]
+         */
+        tmp = LUT[ref_freq][LUT_PARAM_BB_PLL_LOOP_FILTER] | 0x00000030;
+        wl12xx_reg_write32(wl, 0x003058f8, tmp);
+
+        /*
+         * set regulator output voltage for n divider to
+         * 1.35-BB_REFDIV[1:0], set charge pump current- BB_CPGAIN[4:2],
+         * set BB PLL Loop filter capacitor2- BB_C2[7:5], set gain of BB
+         * PLL auto-call to normal mode- BB_CALGAIN_3DB[8]
+         */
+        wl12xx_reg_write32(wl, 0x003058f0, 0x29);
+
+        /* enable restart wakeup sequence (ELP_CMD[0]) */
+        wl12xx_reg_write32(wl, ELP_CMD, elp_cmd | 0x1);
+
+        /* restart sequence completed */
+        udelay(2000);
+
+        return 0;
+}
+
+int wl12xx_boot_run_firmware(struct wl12xx *wl)
+{
+        int loop, ret;
+        u32 chip_id, interrupt;
+
+        wl->chip.op_set_ecpu_ctrl(wl, ECPU_CONTROL_HALT);
+
+        chip_id = wl12xx_reg_read32(wl, CHIP_ID_B);
+
+        wl12xx_debug(DEBUG_BOOT, "chip id after firmware boot: 0x%x", chip_id);
+
+        if (chip_id != wl->chip.id) {
+                wl12xx_error("chip id doesn't match after firmware boot");
+                return -EIO;
+        }
+
+        /* wait for init to complete */
+        loop = 0;
+        while (loop++ < INIT_LOOP) {
+                udelay(INIT_LOOP_DELAY);
+                interrupt = wl12xx_reg_read32(wl, ACX_REG_INTERRUPT_NO_CLEAR);
+
+                if (interrupt == 0xffffffff) {
+                        wl12xx_error("error reading hardware complete "
+                                     "init indication");
+                        return -EIO;
+                }
+                /* check that ACX_INTR_INIT_COMPLETE is enabled */
+                else if (interrupt & wl->chip.intr_init_complete) {
+                        wl12xx_reg_write32(wl, ACX_REG_INTERRUPT_ACK,
+                                           wl->chip.intr_init_complete);
+                        break;
+                }
+        }
+
+        if (loop >= INIT_LOOP) {
+                wl12xx_error("timeout waiting for the hardware to "
+                             "complete initialization");
+                return -EIO;
+        }
+
+        /* get hardware config command mail box */
+        wl->cmd_box_addr = wl12xx_reg_read32(wl, REG_COMMAND_MAILBOX_PTR);
+
+        /* get hardware config event mail box */
+        wl->event_box_addr = wl12xx_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
+
+        /* set the working partition to its "running" mode offset */
+        wl12xx_set_partition(wl,
+                             wl->chip.p_table[PART_WORK].mem.start,
+                             wl->chip.p_table[PART_WORK].mem.size,
+                             wl->chip.p_table[PART_WORK].reg.start,
+                             wl->chip.p_table[PART_WORK].reg.size);
+
+        wl12xx_debug(DEBUG_MAILBOX, "cmd_box_addr 0x%x event_box_addr 0x%x",
+                     wl->cmd_box_addr, wl->event_box_addr);
+
+        /*
+         * in case of full asynchronous mode the firmware event must be
+         * ready to receive event from the command mailbox
+         */
+
+        /* enable gpio interrupts */
+        wl12xx_boot_enable_interrupts(wl);
+
+        wl->chip.op_target_enable_interrupts(wl);
+
+        /* unmask all mbox events  */
+        wl->event_mask = 0xffffffff;
+
+        ret = wl12xx_event_unmask(wl);
+        if (ret < 0) {
+                wl12xx_error("EVENT mask setting failed");
+                return ret;
+        }
+
+        wl12xx_event_mbox_config(wl);
+
+        /* firmware startup completed */
+        return 0;
+}